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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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" | |
28 | #include "parameters.h" | |
29 | #include "reloc.h" | |
30 | #include "x86_64.h" | |
31 | #include "object.h" | |
32 | #include "symtab.h" | |
33 | #include "layout.h" | |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
2e30d253 ILT |
36 | #include "target.h" |
37 | #include "target-reloc.h" | |
38 | #include "target-select.h" | |
e041f13d | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
2e30d253 ILT |
42 | |
43 | namespace | |
44 | { | |
45 | ||
46 | using namespace gold; | |
47 | ||
48 | class Output_data_plt_x86_64; | |
49 | ||
50 | // The x86_64 target class. | |
d61c17ea ILT |
51 | // See the ABI at |
52 | // http://www.x86-64.org/documentation/abi.pdf | |
53 | // TLS info comes from | |
54 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 55 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 56 | |
36959681 | 57 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
58 | { |
59 | public: | |
e822f2b1 ILT |
60 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
61 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
62 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
63 | ||
64 | Target_x86_64() | |
36959681 | 65 | : Target_freebsd<64, false>(&x86_64_info), |
0ffd9845 | 66 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
12c0daef | 67 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), |
edfbb029 | 68 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
2e30d253 ILT |
69 | { } |
70 | ||
8a5e3e08 ILT |
71 | // Hook for a new output section. |
72 | void | |
73 | do_new_output_section(Output_section*) const; | |
74 | ||
6d03d481 ST |
75 | // Scan the relocations to look for symbol adjustments. |
76 | void | |
77 | gc_process_relocs(const General_options& options, | |
78 | Symbol_table* symtab, | |
79 | Layout* layout, | |
80 | Sized_relobj<64, false>* object, | |
81 | unsigned int data_shndx, | |
82 | unsigned int sh_type, | |
83 | const unsigned char* prelocs, | |
84 | size_t reloc_count, | |
85 | Output_section* output_section, | |
86 | bool needs_special_offset_handling, | |
87 | size_t local_symbol_count, | |
88 | const unsigned char* plocal_symbols); | |
89 | ||
2e30d253 ILT |
90 | // Scan the relocations to look for symbol adjustments. |
91 | void | |
92 | scan_relocs(const General_options& options, | |
93 | Symbol_table* symtab, | |
94 | Layout* layout, | |
95 | Sized_relobj<64, false>* object, | |
96 | unsigned int data_shndx, | |
97 | unsigned int sh_type, | |
98 | const unsigned char* prelocs, | |
99 | size_t reloc_count, | |
730cdc88 ILT |
100 | Output_section* output_section, |
101 | bool needs_special_offset_handling, | |
2e30d253 | 102 | size_t local_symbol_count, |
730cdc88 | 103 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
104 | |
105 | // Finalize the sections. | |
106 | void | |
107 | do_finalize_sections(Layout*); | |
108 | ||
4fb6c25d ILT |
109 | // Return the value to use for a dynamic which requires special |
110 | // treatment. | |
111 | uint64_t | |
112 | do_dynsym_value(const Symbol*) const; | |
113 | ||
2e30d253 ILT |
114 | // Relocate a section. |
115 | void | |
116 | relocate_section(const Relocate_info<64, false>*, | |
117 | unsigned int sh_type, | |
118 | const unsigned char* prelocs, | |
119 | size_t reloc_count, | |
730cdc88 ILT |
120 | Output_section* output_section, |
121 | bool needs_special_offset_handling, | |
2e30d253 ILT |
122 | unsigned char* view, |
123 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
124 | section_size_type view_size, |
125 | const Reloc_symbol_changes*); | |
2e30d253 | 126 | |
6a74a719 ILT |
127 | // Scan the relocs during a relocatable link. |
128 | void | |
129 | scan_relocatable_relocs(const General_options& options, | |
130 | Symbol_table* symtab, | |
131 | Layout* layout, | |
132 | Sized_relobj<64, false>* object, | |
133 | unsigned int data_shndx, | |
134 | unsigned int sh_type, | |
135 | const unsigned char* prelocs, | |
136 | size_t reloc_count, | |
137 | Output_section* output_section, | |
138 | bool needs_special_offset_handling, | |
139 | size_t local_symbol_count, | |
140 | const unsigned char* plocal_symbols, | |
141 | Relocatable_relocs*); | |
142 | ||
143 | // Relocate a section during a relocatable link. | |
144 | void | |
145 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
146 | unsigned int sh_type, | |
147 | const unsigned char* prelocs, | |
148 | size_t reloc_count, | |
149 | Output_section* output_section, | |
150 | off_t offset_in_output_section, | |
151 | const Relocatable_relocs*, | |
152 | unsigned char* view, | |
153 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
154 | section_size_type view_size, | |
155 | unsigned char* reloc_view, | |
156 | section_size_type reloc_view_size); | |
157 | ||
2e30d253 ILT |
158 | // Return a string used to fill a code section with nops. |
159 | std::string | |
8851ecca | 160 | do_code_fill(section_size_type length) const; |
2e30d253 | 161 | |
9a2d6984 ILT |
162 | // Return whether SYM is defined by the ABI. |
163 | bool | |
9c2d0ef9 | 164 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
165 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
166 | ||
364c7fa5 ILT |
167 | // Adjust -fstack-split code which calls non-stack-split code. |
168 | void | |
169 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
170 | section_offset_type fnoffset, section_size_type fnsize, | |
171 | unsigned char* view, section_size_type view_size, | |
172 | std::string* from, std::string* to) const; | |
173 | ||
96f2030e | 174 | // Return the size of the GOT section. |
fe8718a4 | 175 | section_size_type |
96f2030e ILT |
176 | got_size() |
177 | { | |
178 | gold_assert(this->got_ != NULL); | |
179 | return this->got_->data_size(); | |
180 | } | |
181 | ||
2e30d253 ILT |
182 | private: |
183 | // The class which scans relocations. | |
a036edd8 | 184 | class Scan |
2e30d253 | 185 | { |
a036edd8 ILT |
186 | public: |
187 | Scan() | |
188 | : issued_non_pic_error_(false) | |
189 | { } | |
190 | ||
2e30d253 ILT |
191 | inline void |
192 | local(const General_options& options, Symbol_table* symtab, | |
193 | Layout* layout, Target_x86_64* target, | |
194 | Sized_relobj<64, false>* object, | |
195 | unsigned int data_shndx, | |
07f397ab | 196 | Output_section* output_section, |
2e30d253 ILT |
197 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
198 | const elfcpp::Sym<64, false>& lsym); | |
199 | ||
200 | inline void | |
201 | global(const General_options& options, Symbol_table* symtab, | |
202 | Layout* layout, Target_x86_64* target, | |
203 | Sized_relobj<64, false>* object, | |
204 | unsigned int data_shndx, | |
07f397ab | 205 | Output_section* output_section, |
2e30d253 ILT |
206 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
207 | Symbol* gsym); | |
e041f13d | 208 | |
a036edd8 | 209 | private: |
e041f13d ILT |
210 | static void |
211 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
212 | ||
213 | static void | |
214 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
215 | Symbol*); | |
a036edd8 ILT |
216 | |
217 | void | |
218 | check_non_pic(Relobj*, unsigned int r_type); | |
219 | ||
220 | // Whether we have issued an error about a non-PIC compilation. | |
221 | bool issued_non_pic_error_; | |
2e30d253 ILT |
222 | }; |
223 | ||
224 | // The class which implements relocation. | |
225 | class Relocate | |
226 | { | |
227 | public: | |
228 | Relocate() | |
497897f9 | 229 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
230 | { } |
231 | ||
232 | ~Relocate() | |
233 | { | |
234 | if (this->skip_call_tls_get_addr_) | |
235 | { | |
236 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 237 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
238 | } |
239 | } | |
240 | ||
241 | // Do a relocation. Return false if the caller should not issue | |
242 | // any warnings about this relocation. | |
243 | inline bool | |
031cdbed ILT |
244 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
245 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
246 | unsigned int r_type, const Sized_symbol<64>*, |
247 | const Symbol_value<64>*, | |
248 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 249 | section_size_type); |
2e30d253 ILT |
250 | |
251 | private: | |
252 | // Do a TLS relocation. | |
253 | inline void | |
7bf1f802 ILT |
254 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
255 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
256 | unsigned int r_type, const Sized_symbol<64>*, |
257 | const Symbol_value<64>*, | |
fe8718a4 ILT |
258 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
259 | section_size_type); | |
2e30d253 | 260 | |
c2b45e22 | 261 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
262 | inline void |
263 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
264 | Output_segment* tls_segment, | |
265 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
266 | elfcpp::Elf_types<64>::Elf_Addr value, | |
267 | unsigned char* view, | |
c2b45e22 | 268 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 269 | section_size_type view_size); |
7bf1f802 | 270 | |
56622147 ILT |
271 | // Do a TLS General-Dynamic to Local-Exec transition. |
272 | inline void | |
273 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
274 | Output_segment* tls_segment, |
275 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
276 | elfcpp::Elf_types<64>::Elf_Addr value, | |
277 | unsigned char* view, | |
fe8718a4 | 278 | section_size_type view_size); |
2e30d253 | 279 | |
c2b45e22 CC |
280 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
281 | inline void | |
282 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
283 | Output_segment* tls_segment, | |
284 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
285 | elfcpp::Elf_types<64>::Elf_Addr value, | |
286 | unsigned char* view, | |
287 | elfcpp::Elf_types<64>::Elf_Addr, | |
288 | section_size_type view_size); | |
289 | ||
290 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
291 | inline void | |
292 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
293 | Output_segment* tls_segment, | |
294 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
295 | elfcpp::Elf_types<64>::Elf_Addr value, | |
296 | unsigned char* view, | |
297 | section_size_type view_size); | |
298 | ||
56622147 | 299 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 300 | inline void |
56622147 | 301 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
302 | Output_segment* tls_segment, |
303 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
304 | elfcpp::Elf_types<64>::Elf_Addr value, | |
305 | unsigned char* view, | |
fe8718a4 | 306 | section_size_type view_size); |
2e30d253 | 307 | |
56622147 ILT |
308 | // Do a TLS Initial-Exec to Local-Exec transition. |
309 | static inline void | |
310 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
311 | Output_segment* tls_segment, |
312 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
313 | elfcpp::Elf_types<64>::Elf_Addr value, | |
314 | unsigned char* view, | |
fe8718a4 | 315 | section_size_type view_size); |
2e30d253 ILT |
316 | |
317 | // This is set if we should skip the next reloc, which should be a | |
318 | // PLT32 reloc against ___tls_get_addr. | |
319 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
320 | |
321 | // This is set if we see a relocation which could load the address | |
322 | // of the TLS block. Whether we see such a relocation determines | |
323 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
324 | // in debugging sections. | |
325 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
326 | }; |
327 | ||
6a74a719 ILT |
328 | // A class which returns the size required for a relocation type, |
329 | // used while scanning relocs during a relocatable link. | |
330 | class Relocatable_size_for_reloc | |
331 | { | |
332 | public: | |
333 | unsigned int | |
334 | get_size_for_reloc(unsigned int, Relobj*); | |
335 | }; | |
336 | ||
2e30d253 ILT |
337 | // Adjust TLS relocation type based on the options and whether this |
338 | // is a local symbol. | |
e041f13d | 339 | static tls::Tls_optimization |
2e30d253 ILT |
340 | optimize_tls_reloc(bool is_final, int r_type); |
341 | ||
342 | // Get the GOT section, creating it if necessary. | |
343 | Output_data_got<64, false>* | |
344 | got_section(Symbol_table*, Layout*); | |
345 | ||
96f2030e ILT |
346 | // Get the GOT PLT section. |
347 | Output_data_space* | |
348 | got_plt_section() const | |
349 | { | |
350 | gold_assert(this->got_plt_ != NULL); | |
351 | return this->got_plt_; | |
352 | } | |
353 | ||
c2b45e22 CC |
354 | // Create the PLT section. |
355 | void | |
356 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
357 | ||
2e30d253 ILT |
358 | // Create a PLT entry for a global symbol. |
359 | void | |
360 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
361 | ||
9fa33bee | 362 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
363 | void |
364 | define_tls_base_symbol(Symbol_table*, Layout*); | |
365 | ||
c2b45e22 CC |
366 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
367 | void | |
368 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
369 | ||
31d60480 ILT |
370 | // Create a GOT entry for the TLS module index. |
371 | unsigned int | |
372 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
373 | Sized_relobj<64, false>* object); | |
374 | ||
2e30d253 ILT |
375 | // Get the PLT section. |
376 | Output_data_plt_x86_64* | |
377 | plt_section() const | |
378 | { | |
379 | gold_assert(this->plt_ != NULL); | |
380 | return this->plt_; | |
381 | } | |
382 | ||
383 | // Get the dynamic reloc section, creating it if necessary. | |
384 | Reloc_section* | |
0ffd9845 | 385 | rela_dyn_section(Layout*); |
2e30d253 | 386 | |
12c0daef | 387 | // Add a potential copy relocation. |
2e30d253 | 388 | void |
ef9beddf ILT |
389 | copy_reloc(Symbol_table* symtab, Layout* layout, |
390 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
391 | unsigned int shndx, Output_section* output_section, |
392 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
393 | { | |
394 | this->copy_relocs_.copy_reloc(symtab, layout, | |
395 | symtab->get_sized_symbol<64>(sym), | |
396 | object, shndx, output_section, | |
397 | reloc, this->rela_dyn_section(layout)); | |
398 | } | |
2e30d253 ILT |
399 | |
400 | // Information about this specific target which we pass to the | |
401 | // general Target structure. | |
402 | static const Target::Target_info x86_64_info; | |
403 | ||
0a65a3a7 CC |
404 | enum Got_type |
405 | { | |
406 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
407 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
408 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
409 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
410 | }; | |
411 | ||
2e30d253 ILT |
412 | // The GOT section. |
413 | Output_data_got<64, false>* got_; | |
414 | // The PLT section. | |
415 | Output_data_plt_x86_64* plt_; | |
416 | // The GOT PLT section. | |
417 | Output_data_space* got_plt_; | |
418 | // The dynamic reloc section. | |
0ffd9845 | 419 | Reloc_section* rela_dyn_; |
2e30d253 | 420 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 421 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
422 | // Space for variables copied with a COPY reloc. |
423 | Output_data_space* dynbss_; | |
c2b45e22 | 424 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 425 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
426 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
427 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
428 | }; |
429 | ||
430 | const Target::Target_info Target_x86_64::x86_64_info = | |
431 | { | |
432 | 64, // size | |
433 | false, // is_big_endian | |
434 | elfcpp::EM_X86_64, // machine_code | |
435 | false, // has_make_symbol | |
436 | false, // has_resolve | |
437 | true, // has_code_fill | |
35cdfc9a | 438 | true, // is_default_stack_executable |
0864d551 | 439 | '\0', // wrap_char |
2e30d253 | 440 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 441 | 0x400000, // default_text_segment_address |
cd72c291 | 442 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
443 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
444 | elfcpp::SHN_UNDEF, // small_common_shndx | |
445 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
446 | 0, // small_common_section_flags | |
447 | elfcpp::SHF_X86_64_LARGE // large_common_section_flags | |
2e30d253 ILT |
448 | }; |
449 | ||
8a5e3e08 ILT |
450 | // This is called when a new output section is created. This is where |
451 | // we handle the SHF_X86_64_LARGE. | |
452 | ||
453 | void | |
454 | Target_x86_64::do_new_output_section(Output_section *os) const | |
455 | { | |
456 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
457 | os->set_is_large_section(); | |
458 | } | |
459 | ||
2e30d253 ILT |
460 | // Get the GOT section, creating it if necessary. |
461 | ||
462 | Output_data_got<64, false>* | |
463 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
464 | { | |
465 | if (this->got_ == NULL) | |
466 | { | |
467 | gold_assert(symtab != NULL && layout != NULL); | |
468 | ||
469 | this->got_ = new Output_data_got<64, false>(); | |
470 | ||
9f1d377b ILT |
471 | Output_section* os; |
472 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
473 | (elfcpp::SHF_ALLOC | |
474 | | elfcpp::SHF_WRITE), | |
475 | this->got_); | |
476 | os->set_is_relro(); | |
2e30d253 ILT |
477 | |
478 | // The old GNU linker creates a .got.plt section. We just | |
479 | // create another set of data in the .got section. Note that we | |
480 | // always create a PLT if we create a GOT, although the PLT | |
481 | // might be empty. | |
7d9e3d98 | 482 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
9f1d377b ILT |
483 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
484 | (elfcpp::SHF_ALLOC | |
485 | | elfcpp::SHF_WRITE), | |
486 | this->got_plt_); | |
487 | os->set_is_relro(); | |
2e30d253 ILT |
488 | |
489 | // The first three entries are reserved. | |
27bc2bce | 490 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
491 | |
492 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 493 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
494 | this->got_plt_, |
495 | 0, 0, elfcpp::STT_OBJECT, | |
496 | elfcpp::STB_LOCAL, | |
497 | elfcpp::STV_HIDDEN, 0, | |
498 | false, false); | |
499 | } | |
500 | ||
501 | return this->got_; | |
502 | } | |
503 | ||
504 | // Get the dynamic reloc section, creating it if necessary. | |
505 | ||
506 | Target_x86_64::Reloc_section* | |
0ffd9845 | 507 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 508 | { |
0ffd9845 | 509 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
510 | { |
511 | gold_assert(layout != NULL); | |
d98bc257 | 512 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 513 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 514 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 515 | } |
0ffd9845 | 516 | return this->rela_dyn_; |
2e30d253 ILT |
517 | } |
518 | ||
519 | // A class to handle the PLT data. | |
520 | ||
521 | class Output_data_plt_x86_64 : public Output_section_data | |
522 | { | |
523 | public: | |
524 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
525 | ||
c2b45e22 CC |
526 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
527 | Output_data_space*); | |
2e30d253 ILT |
528 | |
529 | // Add an entry to the PLT. | |
530 | void | |
531 | add_entry(Symbol* gsym); | |
532 | ||
c2b45e22 CC |
533 | // Add the reserved TLSDESC_PLT entry to the PLT. |
534 | void | |
535 | reserve_tlsdesc_entry(unsigned int got_offset) | |
536 | { this->tlsdesc_got_offset_ = got_offset; } | |
537 | ||
538 | // Return true if a TLSDESC_PLT entry has been reserved. | |
539 | bool | |
540 | has_tlsdesc_entry() const | |
541 | { return this->tlsdesc_got_offset_ != -1U; } | |
542 | ||
543 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
544 | unsigned int | |
545 | get_tlsdesc_got_offset() const | |
546 | { return this->tlsdesc_got_offset_; } | |
547 | ||
548 | // Return the offset of the reserved TLSDESC_PLT entry. | |
549 | unsigned int | |
550 | get_tlsdesc_plt_offset() const | |
551 | { return (this->count_ + 1) * plt_entry_size; } | |
552 | ||
2e30d253 ILT |
553 | // Return the .rel.plt section data. |
554 | const Reloc_section* | |
555 | rel_plt() const | |
556 | { return this->rel_; } | |
557 | ||
558 | protected: | |
559 | void | |
560 | do_adjust_output_section(Output_section* os); | |
561 | ||
7d9e3d98 ILT |
562 | // Write to a map file. |
563 | void | |
564 | do_print_to_mapfile(Mapfile* mapfile) const | |
565 | { mapfile->print_output_data(this, _("** PLT")); } | |
566 | ||
2e30d253 ILT |
567 | private: |
568 | // The size of an entry in the PLT. | |
569 | static const int plt_entry_size = 16; | |
570 | ||
571 | // The first entry in the PLT. | |
572 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
573 | // procedure linkage table for both programs and shared objects." | |
574 | static unsigned char first_plt_entry[plt_entry_size]; | |
575 | ||
576 | // Other entries in the PLT for an executable. | |
577 | static unsigned char plt_entry[plt_entry_size]; | |
578 | ||
c2b45e22 CC |
579 | // The reserved TLSDESC entry in the PLT for an executable. |
580 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
581 | ||
2e30d253 ILT |
582 | // Set the final size. |
583 | void | |
c2b45e22 | 584 | set_final_data_size(); |
2e30d253 ILT |
585 | |
586 | // Write out the PLT data. | |
587 | void | |
588 | do_write(Output_file*); | |
589 | ||
590 | // The reloc section. | |
591 | Reloc_section* rel_; | |
c2b45e22 CC |
592 | // The .got section. |
593 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
594 | // The .got.plt section. |
595 | Output_data_space* got_plt_; | |
596 | // The number of PLT entries. | |
597 | unsigned int count_; | |
c2b45e22 CC |
598 | // Offset of the reserved TLSDESC_GOT entry when needed. |
599 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
600 | }; |
601 | ||
602 | // Create the PLT section. The ordinary .got section is an argument, | |
603 | // since we need to refer to the start. We also create our own .got | |
604 | // section just for PLT entries. | |
605 | ||
606 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 607 | Output_data_got<64, false>* got, |
2e30d253 | 608 | Output_data_space* got_plt) |
c2b45e22 CC |
609 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
610 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 611 | { |
d98bc257 | 612 | this->rel_ = new Reloc_section(false); |
2e30d253 ILT |
613 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
614 | elfcpp::SHF_ALLOC, this->rel_); | |
615 | } | |
616 | ||
617 | void | |
618 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
619 | { | |
b0481b0b | 620 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
621 | } |
622 | ||
623 | // Add an entry to the PLT. | |
624 | ||
625 | void | |
626 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
627 | { | |
628 | gold_assert(!gsym->has_plt_offset()); | |
629 | ||
630 | // Note that when setting the PLT offset we skip the initial | |
631 | // reserved PLT entry. | |
632 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
633 | ||
634 | ++this->count_; | |
635 | ||
fe8718a4 | 636 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
637 | |
638 | // Every PLT entry needs a GOT entry which points back to the PLT | |
639 | // entry (this will be changed by the dynamic linker, normally | |
640 | // lazily when the function is called). | |
27bc2bce | 641 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
642 | |
643 | // Every PLT entry needs a reloc. | |
644 | gsym->set_needs_dynsym_entry(); | |
645 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
646 | got_offset, 0); | |
647 | ||
648 | // Note that we don't need to save the symbol. The contents of the | |
649 | // PLT are independent of which symbols are used. The symbols only | |
650 | // appear in the relocations. | |
651 | } | |
652 | ||
c2b45e22 CC |
653 | // Set the final size. |
654 | void | |
655 | Output_data_plt_x86_64::set_final_data_size() | |
656 | { | |
657 | unsigned int count = this->count_; | |
658 | if (this->has_tlsdesc_entry()) | |
659 | ++count; | |
660 | this->set_data_size((count + 1) * plt_entry_size); | |
661 | } | |
662 | ||
2e30d253 ILT |
663 | // The first entry in the PLT for an executable. |
664 | ||
665 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
666 | { | |
667 | // From AMD64 ABI Draft 0.98, page 76 | |
668 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 669 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
670 | 0xff, 0x25, // jmp indirect |
671 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
672 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
673 | }; | |
674 | ||
675 | // Subsequent entries in the PLT for an executable. | |
676 | ||
677 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
678 | { | |
679 | // From AMD64 ABI Draft 0.98, page 76 | |
680 | 0xff, 0x25, // jmpq indirect | |
681 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
682 | 0x68, // pushq immediate | |
683 | 0, 0, 0, 0, // replaced with offset into relocation table | |
684 | 0xe9, // jmpq relative | |
685 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
686 | }; | |
687 | ||
c2b45e22 CC |
688 | // The reserved TLSDESC entry in the PLT for an executable. |
689 | ||
690 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
691 | { | |
692 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
693 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
694 | 0xff, 0x35, // pushq x(%rip) | |
695 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
696 | 0xff, 0x25, // jmpq *y(%rip) | |
697 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
698 | 0x0f, 0x1f, // nop | |
699 | 0x40, 0 | |
700 | }; | |
701 | ||
2e30d253 ILT |
702 | // Write out the PLT. This uses the hand-coded instructions above, |
703 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
704 | ||
705 | void | |
706 | Output_data_plt_x86_64::do_write(Output_file* of) | |
707 | { | |
708 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
709 | const section_size_type oview_size = |
710 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
711 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
712 | ||
713 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
714 | const section_size_type got_size = |
715 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
716 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
717 | got_size); | |
718 | ||
719 | unsigned char* pov = oview; | |
720 | ||
c2b45e22 | 721 | // The base address of the .plt section. |
a984ee1d | 722 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 723 | // The base address of the .got section. |
a984ee1d | 724 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
725 | // The base address of the PLT portion of the .got section, |
726 | // which is where the GOT pointer will point, and where the | |
727 | // three reserved GOT entries are located. | |
a984ee1d | 728 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
729 | |
730 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 731 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
732 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
733 | (got_address + 8 | |
734 | - (plt_address + 6))); | |
735 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
736 | (got_address + 16 | |
737 | - (plt_address + 12))); | |
2e30d253 ILT |
738 | pov += plt_entry_size; |
739 | ||
740 | unsigned char* got_pov = got_view; | |
741 | ||
742 | memset(got_pov, 0, 24); | |
743 | got_pov += 24; | |
744 | ||
745 | unsigned int plt_offset = plt_entry_size; | |
746 | unsigned int got_offset = 24; | |
747 | const unsigned int count = this->count_; | |
748 | for (unsigned int plt_index = 0; | |
749 | plt_index < count; | |
750 | ++plt_index, | |
751 | pov += plt_entry_size, | |
752 | got_pov += 8, | |
753 | plt_offset += plt_entry_size, | |
754 | got_offset += 8) | |
755 | { | |
756 | // Set and adjust the PLT entry itself. | |
757 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
758 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
759 | (got_address + got_offset | |
760 | - (plt_address + plt_offset | |
761 | + 6))); | |
2e30d253 ILT |
762 | |
763 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
764 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
765 | - (plt_offset + plt_entry_size)); | |
766 | ||
767 | // Set the entry in the GOT. | |
768 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
769 | } | |
770 | ||
c2b45e22 CC |
771 | if (this->has_tlsdesc_entry()) |
772 | { | |
773 | // Set and adjust the reserved TLSDESC PLT entry. | |
774 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
775 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
776 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
777 | (got_address + 8 | |
778 | - (plt_address + plt_offset | |
779 | + 6))); | |
780 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
781 | (got_base | |
782 | + tlsdesc_got_offset | |
783 | - (plt_address + plt_offset | |
784 | + 12))); | |
785 | pov += plt_entry_size; | |
786 | } | |
787 | ||
fe8718a4 ILT |
788 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
789 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
790 | |
791 | of->write_output_view(offset, oview_size, oview); | |
792 | of->write_output_view(got_file_offset, got_size, got_view); | |
793 | } | |
794 | ||
c2b45e22 | 795 | // Create the PLT section. |
2e30d253 ILT |
796 | |
797 | void | |
c2b45e22 | 798 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 799 | { |
2e30d253 ILT |
800 | if (this->plt_ == NULL) |
801 | { | |
802 | // Create the GOT sections first. | |
803 | this->got_section(symtab, layout); | |
804 | ||
c2b45e22 CC |
805 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
806 | this->got_plt_); | |
2e30d253 ILT |
807 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
808 | (elfcpp::SHF_ALLOC | |
809 | | elfcpp::SHF_EXECINSTR), | |
810 | this->plt_); | |
811 | } | |
c2b45e22 CC |
812 | } |
813 | ||
814 | // Create a PLT entry for a global symbol. | |
815 | ||
816 | void | |
817 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
818 | Symbol* gsym) | |
819 | { | |
820 | if (gsym->has_plt_offset()) | |
821 | return; | |
822 | ||
823 | if (this->plt_ == NULL) | |
824 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
825 | |
826 | this->plt_->add_entry(gsym); | |
827 | } | |
828 | ||
9fa33bee | 829 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
830 | |
831 | void | |
832 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
833 | { | |
834 | if (this->tls_base_symbol_defined_) | |
835 | return; | |
836 | ||
837 | Output_segment* tls_segment = layout->tls_segment(); | |
838 | if (tls_segment != NULL) | |
839 | { | |
183fd0e3 | 840 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
841 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
842 | tls_segment, 0, 0, | |
843 | elfcpp::STT_TLS, | |
844 | elfcpp::STB_LOCAL, | |
845 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
846 | (is_exec |
847 | ? Symbol::SEGMENT_END | |
848 | : Symbol::SEGMENT_START), | |
849 | true); | |
edfbb029 CC |
850 | } |
851 | this->tls_base_symbol_defined_ = true; | |
852 | } | |
853 | ||
c2b45e22 CC |
854 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
855 | ||
856 | void | |
857 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
858 | Layout* layout) | |
859 | { | |
860 | if (this->plt_ == NULL) | |
861 | this->make_plt_section(symtab, layout); | |
862 | ||
863 | if (!this->plt_->has_tlsdesc_entry()) | |
864 | { | |
865 | // Allocate the TLSDESC_GOT entry. | |
866 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
867 | unsigned int got_offset = got->add_constant(0); | |
868 | ||
869 | // Allocate the TLSDESC_PLT entry. | |
870 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
871 | } | |
872 | } | |
873 | ||
31d60480 ILT |
874 | // Create a GOT entry for the TLS module index. |
875 | ||
876 | unsigned int | |
877 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
878 | Sized_relobj<64, false>* object) | |
879 | { | |
880 | if (this->got_mod_index_offset_ == -1U) | |
881 | { | |
882 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
883 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
884 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
885 | unsigned int got_offset = got->add_constant(0); | |
886 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
887 | got_offset, 0); | |
009a67a2 | 888 | got->add_constant(0); |
31d60480 ILT |
889 | this->got_mod_index_offset_ = got_offset; |
890 | } | |
891 | return this->got_mod_index_offset_; | |
892 | } | |
893 | ||
2e30d253 ILT |
894 | // Optimize the TLS relocation type based on what we know about the |
895 | // symbol. IS_FINAL is true if the final address of this symbol is | |
896 | // known at link time. | |
897 | ||
e041f13d | 898 | tls::Tls_optimization |
2e30d253 ILT |
899 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
900 | { | |
2e30d253 ILT |
901 | // If we are generating a shared library, then we can't do anything |
902 | // in the linker. | |
8851ecca | 903 | if (parameters->options().shared()) |
e041f13d | 904 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
905 | |
906 | switch (r_type) | |
907 | { | |
908 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
909 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
910 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
911 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
912 | // access. Since we know that we are generating an executable, |
913 | // we can convert this to Initial-Exec. If we also know that | |
914 | // this is a local symbol, we can further switch to Local-Exec. | |
915 | if (is_final) | |
e041f13d ILT |
916 | return tls::TLSOPT_TO_LE; |
917 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 918 | |
d61c17ea | 919 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
920 | // This is Local-Dynamic, which refers to a local symbol in the |
921 | // dynamic TLS block. Since we know that we generating an | |
922 | // executable, we can switch to Local-Exec. | |
e041f13d | 923 | return tls::TLSOPT_TO_LE; |
2e30d253 | 924 | |
0ffd9845 | 925 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
926 | case elfcpp::R_X86_64_DTPOFF64: |
927 | // Another Local-Dynamic reloc. | |
e041f13d | 928 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 929 | |
d61c17ea | 930 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
931 | // These are Initial-Exec relocs which get the thread offset |
932 | // from the GOT. If we know that we are linking against the | |
933 | // local symbol, we can switch to Local-Exec, which links the | |
934 | // thread offset into the instruction. | |
935 | if (is_final) | |
e041f13d ILT |
936 | return tls::TLSOPT_TO_LE; |
937 | return tls::TLSOPT_NONE; | |
2e30d253 | 938 | |
d61c17ea | 939 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
940 | // When we already have Local-Exec, there is nothing further we |
941 | // can do. | |
e041f13d | 942 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
943 | |
944 | default: | |
945 | gold_unreachable(); | |
946 | } | |
2e30d253 ILT |
947 | } |
948 | ||
e041f13d ILT |
949 | // Report an unsupported relocation against a local symbol. |
950 | ||
951 | void | |
952 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
953 | unsigned int r_type) | |
954 | { | |
75f2446e ILT |
955 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
956 | object->name().c_str(), r_type); | |
e041f13d ILT |
957 | } |
958 | ||
a036edd8 ILT |
959 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
960 | // dynamic linker does not support it, issue an error. The GNU linker | |
961 | // only issues a non-PIC error for an allocated read-only section. | |
962 | // Here we know the section is allocated, but we don't know that it is | |
963 | // read-only. But we check for all the relocation types which the | |
964 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
965 | // error even if the section is not read-only. | |
966 | ||
967 | void | |
968 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
969 | { | |
970 | switch (r_type) | |
971 | { | |
972 | // These are the relocation types supported by glibc for x86_64. | |
973 | case elfcpp::R_X86_64_RELATIVE: | |
974 | case elfcpp::R_X86_64_GLOB_DAT: | |
975 | case elfcpp::R_X86_64_JUMP_SLOT: | |
976 | case elfcpp::R_X86_64_DTPMOD64: | |
977 | case elfcpp::R_X86_64_DTPOFF64: | |
978 | case elfcpp::R_X86_64_TPOFF64: | |
979 | case elfcpp::R_X86_64_64: | |
980 | case elfcpp::R_X86_64_32: | |
981 | case elfcpp::R_X86_64_PC32: | |
982 | case elfcpp::R_X86_64_COPY: | |
983 | return; | |
984 | ||
985 | default: | |
986 | // This prevents us from issuing more than one error per reloc | |
987 | // section. But we can still wind up issuing more than one | |
988 | // error per object file. | |
989 | if (this->issued_non_pic_error_) | |
990 | return; | |
33aea2fd | 991 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
992 | object->error(_("requires unsupported dynamic reloc; " |
993 | "recompile with -fPIC")); | |
994 | this->issued_non_pic_error_ = true; | |
995 | return; | |
996 | ||
997 | case elfcpp::R_X86_64_NONE: | |
998 | gold_unreachable(); | |
999 | } | |
1000 | } | |
1001 | ||
2e30d253 ILT |
1002 | // Scan a relocation for a local symbol. |
1003 | ||
1004 | inline void | |
1005 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
1006 | Symbol_table* symtab, |
1007 | Layout* layout, | |
1008 | Target_x86_64* target, | |
1009 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1010 | unsigned int data_shndx, |
4f4c5f80 | 1011 | Output_section* output_section, |
0ffd9845 | 1012 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1013 | unsigned int r_type, |
7bf1f802 | 1014 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1015 | { |
1016 | switch (r_type) | |
1017 | { | |
1018 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1019 | case elfcpp::R_386_GNU_VTINHERIT: |
1020 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1021 | break; |
1022 | ||
1023 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1024 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1025 | // executable), we need to create a dynamic relocation for this |
1026 | // location. The relocation applied at link time will apply the | |
1027 | // link-time value, so we flag the location with an | |
1028 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1029 | // relocate it easily. |
8851ecca | 1030 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1031 | { |
e8c846c3 | 1032 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1033 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1034 | rela_dyn->add_local_relative(object, r_sym, |
1035 | elfcpp::R_X86_64_RELATIVE, | |
1036 | output_section, data_shndx, | |
1037 | reloc.get_r_offset(), | |
1038 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1039 | } |
1040 | break; | |
1041 | ||
2e30d253 ILT |
1042 | case elfcpp::R_X86_64_32: |
1043 | case elfcpp::R_X86_64_32S: | |
1044 | case elfcpp::R_X86_64_16: | |
1045 | case elfcpp::R_X86_64_8: | |
96f2030e | 1046 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1047 | // executable), we need to create a dynamic relocation for this |
1048 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1049 | // because that is always a 64-bit relocation. | |
8851ecca | 1050 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1051 | { |
a036edd8 ILT |
1052 | this->check_non_pic(object, r_type); |
1053 | ||
96f2030e | 1054 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1055 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1056 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1057 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1058 | data_shndx, reloc.get_r_offset(), | |
1059 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1060 | else |
1061 | { | |
1062 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1063 | unsigned int shndx = lsym.get_st_shndx(); |
1064 | bool is_ordinary; | |
1065 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1066 | &is_ordinary); | |
1067 | if (!is_ordinary) | |
1068 | object->error(_("section symbol %u has bad shndx %u"), | |
1069 | r_sym, shndx); | |
1070 | else | |
1071 | rela_dyn->add_local_section(object, shndx, | |
1072 | r_type, output_section, | |
1073 | data_shndx, reloc.get_r_offset(), | |
1074 | reloc.get_r_addend()); | |
dceae3c1 | 1075 | } |
96f2030e | 1076 | } |
2e30d253 ILT |
1077 | break; |
1078 | ||
1079 | case elfcpp::R_X86_64_PC64: | |
1080 | case elfcpp::R_X86_64_PC32: | |
1081 | case elfcpp::R_X86_64_PC16: | |
1082 | case elfcpp::R_X86_64_PC8: | |
1083 | break; | |
1084 | ||
f389a824 ILT |
1085 | case elfcpp::R_X86_64_PLT32: |
1086 | // Since we know this is a local symbol, we can handle this as a | |
1087 | // PC32 reloc. | |
1088 | break; | |
1089 | ||
fdc2f80f | 1090 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1091 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1092 | case elfcpp::R_X86_64_GOTPC64: |
1093 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1094 | // We need a GOT section. |
1095 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1096 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1097 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1098 | break; |
1099 | ||
0ffd9845 ILT |
1100 | case elfcpp::R_X86_64_GOT64: |
1101 | case elfcpp::R_X86_64_GOT32: | |
1102 | case elfcpp::R_X86_64_GOTPCREL64: | |
1103 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1104 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1105 | { |
1106 | // The symbol requires a GOT entry. | |
1107 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1108 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1109 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1110 | { |
1111 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1112 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1113 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1114 | { |
1115 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1116 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1117 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1118 | rela_dyn->add_local_relative( |
1119 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1120 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1121 | else |
dceae3c1 | 1122 | { |
a036edd8 ILT |
1123 | this->check_non_pic(object, r_type); |
1124 | ||
dceae3c1 | 1125 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1126 | rela_dyn->add_local( |
1127 | object, r_sym, r_type, got, | |
1128 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1129 | } |
0ffd9845 ILT |
1130 | } |
1131 | } | |
ee9e9e86 ILT |
1132 | // For GOTPLT64, we'd normally want a PLT section, but since |
1133 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1134 | } |
1135 | break; | |
1136 | ||
2e30d253 ILT |
1137 | case elfcpp::R_X86_64_COPY: |
1138 | case elfcpp::R_X86_64_GLOB_DAT: | |
1139 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1140 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1141 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1142 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1143 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1144 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1145 | gold_error(_("%s: unexpected reloc %u in object file"), |
1146 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1147 | break; |
1148 | ||
d61c17ea | 1149 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1150 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1151 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1152 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1153 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1154 | case elfcpp::R_X86_64_DTPOFF32: |
1155 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1156 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1157 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1158 | { |
8851ecca | 1159 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1160 | const tls::Tls_optimization optimized_type |
1161 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1162 | switch (r_type) |
1163 | { | |
56622147 | 1164 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1165 | if (optimized_type == tls::TLSOPT_NONE) |
1166 | { | |
1167 | // Create a pair of GOT entries for the module index and | |
1168 | // dtv-relative offset. | |
1169 | Output_data_got<64, false>* got | |
1170 | = target->got_section(symtab, layout); | |
1171 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1172 | unsigned int shndx = lsym.get_st_shndx(); |
1173 | bool is_ordinary; | |
1174 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1175 | if (!is_ordinary) | |
1176 | object->error(_("local symbol %u has bad shndx %u"), | |
1177 | r_sym, shndx); | |
1178 | else | |
1179 | got->add_local_pair_with_rela(object, r_sym, | |
1180 | shndx, | |
1181 | GOT_TYPE_TLS_PAIR, | |
1182 | target->rela_dyn_section(layout), | |
1183 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1184 | } |
1185 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1186 | unsupported_reloc_local(object, r_type); | |
1187 | break; | |
1188 | ||
56622147 | 1189 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1190 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1191 | if (optimized_type == tls::TLSOPT_NONE) |
1192 | { | |
1193 | // Create reserved PLT and GOT entries for the resolver. | |
1194 | target->reserve_tlsdesc_entries(symtab, layout); | |
1195 | ||
1196 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1197 | Output_data_got<64, false>* got | |
1198 | = target->got_section(symtab, layout); | |
1199 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1200 | unsigned int shndx = lsym.get_st_shndx(); |
1201 | bool is_ordinary; | |
1202 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1203 | if (!is_ordinary) | |
1204 | object->error(_("local symbol %u has bad shndx %u"), | |
1205 | r_sym, shndx); | |
1206 | else | |
1207 | got->add_local_pair_with_rela(object, r_sym, | |
1208 | shndx, | |
1209 | GOT_TYPE_TLS_DESC, | |
1210 | target->rela_dyn_section(layout), | |
1211 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1212 | } |
1213 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1214 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1215 | break; |
1216 | ||
c2b45e22 CC |
1217 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1218 | break; | |
1219 | ||
e041f13d | 1220 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1221 | if (optimized_type == tls::TLSOPT_NONE) |
1222 | { | |
1223 | // Create a GOT entry for the module index. | |
31d60480 | 1224 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1225 | } |
1226 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1227 | unsupported_reloc_local(object, r_type); | |
1228 | break; | |
1229 | ||
0ffd9845 ILT |
1230 | case elfcpp::R_X86_64_DTPOFF32: |
1231 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1232 | break; |
1233 | ||
56622147 | 1234 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1235 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1236 | if (optimized_type == tls::TLSOPT_NONE) |
1237 | { | |
1238 | // Create a GOT entry for the tp-relative offset. | |
1239 | Output_data_got<64, false>* got | |
1240 | = target->got_section(symtab, layout); | |
1241 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1242 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1243 | target->rela_dyn_section(layout), |
1244 | elfcpp::R_X86_64_TPOFF64); | |
1245 | } | |
1246 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1247 | unsupported_reloc_local(object, r_type); |
1248 | break; | |
0ffd9845 | 1249 | |
56622147 | 1250 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1251 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1252 | if (output_is_shared) |
1253 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1254 | break; |
e041f13d ILT |
1255 | |
1256 | default: | |
1257 | gold_unreachable(); | |
2e30d253 ILT |
1258 | } |
1259 | } | |
1260 | break; | |
2e30d253 | 1261 | |
fdc2f80f ILT |
1262 | case elfcpp::R_X86_64_SIZE32: |
1263 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1264 | default: |
75f2446e ILT |
1265 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1266 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1267 | break; |
1268 | } | |
1269 | } | |
1270 | ||
1271 | ||
e041f13d ILT |
1272 | // Report an unsupported relocation against a global symbol. |
1273 | ||
1274 | void | |
1275 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1276 | unsigned int r_type, | |
1277 | Symbol* gsym) | |
1278 | { | |
75f2446e | 1279 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1280 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1281 | } |
1282 | ||
2e30d253 ILT |
1283 | // Scan a relocation for a global symbol. |
1284 | ||
1285 | inline void | |
12c0daef | 1286 | Target_x86_64::Scan::global(const General_options&, |
d61c17ea ILT |
1287 | Symbol_table* symtab, |
1288 | Layout* layout, | |
1289 | Target_x86_64* target, | |
1290 | Sized_relobj<64, false>* object, | |
1291 | unsigned int data_shndx, | |
4f4c5f80 | 1292 | Output_section* output_section, |
d61c17ea ILT |
1293 | const elfcpp::Rela<64, false>& reloc, |
1294 | unsigned int r_type, | |
1295 | Symbol* gsym) | |
2e30d253 ILT |
1296 | { |
1297 | switch (r_type) | |
1298 | { | |
1299 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1300 | case elfcpp::R_386_GNU_VTINHERIT: |
1301 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1302 | break; |
1303 | ||
1304 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1305 | case elfcpp::R_X86_64_32: |
1306 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1307 | case elfcpp::R_X86_64_16: |
2e30d253 | 1308 | case elfcpp::R_X86_64_8: |
96f2030e | 1309 | { |
d61c6bd4 ILT |
1310 | // Make a PLT entry if necessary. |
1311 | if (gsym->needs_plt_entry()) | |
1312 | { | |
1313 | target->make_plt_entry(symtab, layout, gsym); | |
1314 | // Since this is not a PC-relative relocation, we may be | |
1315 | // taking the address of a function. In that case we need to | |
1316 | // set the entry in the dynamic symbol table to the address of | |
1317 | // the PLT entry. | |
8851ecca | 1318 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1319 | gsym->set_needs_dynsym_value(); |
1320 | } | |
1321 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1322 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1323 | { |
966d4097 | 1324 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1325 | { |
12c0daef | 1326 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1327 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1328 | } |
1329 | else if (r_type == elfcpp::R_X86_64_64 | |
1330 | && gsym->can_use_relative_reloc(false)) | |
1331 | { | |
1332 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1333 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1334 | output_section, object, | |
1335 | data_shndx, reloc.get_r_offset(), | |
1336 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1337 | } |
1338 | else | |
1339 | { | |
a036edd8 | 1340 | this->check_non_pic(object, r_type); |
96f2030e | 1341 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1342 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1343 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1344 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1345 | } |
1346 | } | |
1347 | } | |
1348 | break; | |
1349 | ||
1350 | case elfcpp::R_X86_64_PC64: | |
1351 | case elfcpp::R_X86_64_PC32: | |
1352 | case elfcpp::R_X86_64_PC16: | |
1353 | case elfcpp::R_X86_64_PC8: | |
1354 | { | |
1355 | // Make a PLT entry if necessary. | |
1356 | if (gsym->needs_plt_entry()) | |
1357 | target->make_plt_entry(symtab, layout, gsym); | |
1358 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1359 | int flags = Symbol::NON_PIC_REF; |
1360 | if (gsym->type() == elfcpp::STT_FUNC) | |
1361 | flags |= Symbol::FUNCTION_CALL; | |
1362 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1363 | { |
966d4097 | 1364 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1365 | { |
12c0daef | 1366 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1367 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1368 | } |
86849f1f | 1369 | else |
d61c6bd4 | 1370 | { |
a036edd8 | 1371 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1372 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1373 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1374 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1375 | reloc.get_r_addend()); |
1376 | } | |
86849f1f | 1377 | } |
d61c6bd4 | 1378 | } |
2e30d253 ILT |
1379 | break; |
1380 | ||
ff006520 | 1381 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1382 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1383 | case elfcpp::R_X86_64_GOTPCREL64: |
1384 | case elfcpp::R_X86_64_GOTPCREL: | |
1385 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1386 | { |
1387 | // The symbol requires a GOT entry. | |
1388 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1389 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1390 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1391 | else |
1392 | { | |
2e30d253 ILT |
1393 | // If this symbol is not fully resolved, we need to add a |
1394 | // dynamic relocation for it. | |
7bf1f802 | 1395 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1396 | if (gsym->is_from_dynobj() |
1397 | || gsym->is_undefined() | |
1398 | || gsym->is_preemptible()) | |
0a65a3a7 | 1399 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1400 | elfcpp::R_X86_64_GLOB_DAT); |
1401 | else | |
2e30d253 | 1402 | { |
0a65a3a7 CC |
1403 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1404 | rela_dyn->add_global_relative( | |
1405 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1406 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1407 | } |
1408 | } | |
ee9e9e86 ILT |
1409 | // For GOTPLT64, we also need a PLT entry (but only if the |
1410 | // symbol is not fully resolved). | |
1411 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1412 | && !gsym->final_value_is_known()) | |
1413 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1414 | } |
1415 | break; | |
1416 | ||
1417 | case elfcpp::R_X86_64_PLT32: | |
1418 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1419 | // Otherwise we need a PLT entry. | |
1420 | if (gsym->final_value_is_known()) | |
1421 | break; | |
96f2030e ILT |
1422 | // If building a shared library, we can also skip the PLT entry |
1423 | // if the symbol is defined in the output file and is protected | |
1424 | // or hidden. | |
1425 | if (gsym->is_defined() | |
1426 | && !gsym->is_from_dynobj() | |
1427 | && !gsym->is_preemptible()) | |
1428 | break; | |
2e30d253 ILT |
1429 | target->make_plt_entry(symtab, layout, gsym); |
1430 | break; | |
1431 | ||
fdc2f80f | 1432 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1433 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1434 | case elfcpp::R_X86_64_GOTPC64: |
1435 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1436 | // We need a GOT section. |
1437 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1438 | // For PLTOFF64, we also need a PLT entry (but only if the |
1439 | // symbol is not fully resolved). | |
1440 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1441 | && !gsym->final_value_is_known()) | |
1442 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1443 | break; |
1444 | ||
2e30d253 ILT |
1445 | case elfcpp::R_X86_64_COPY: |
1446 | case elfcpp::R_X86_64_GLOB_DAT: | |
1447 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1448 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1449 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1450 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1451 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1452 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1453 | gold_error(_("%s: unexpected reloc %u in object file"), |
1454 | object->name().c_str(), r_type); | |
2e30d253 | 1455 | break; |
2e30d253 | 1456 | |
d61c17ea | 1457 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1458 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1459 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1460 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1461 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1462 | case elfcpp::R_X86_64_DTPOFF32: |
1463 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1464 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1465 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1466 | { |
1467 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1468 | const tls::Tls_optimization optimized_type |
1469 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1470 | switch (r_type) |
1471 | { | |
56622147 | 1472 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1473 | if (optimized_type == tls::TLSOPT_NONE) |
1474 | { | |
1475 | // Create a pair of GOT entries for the module index and | |
1476 | // dtv-relative offset. | |
1477 | Output_data_got<64, false>* got | |
1478 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1479 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1480 | target->rela_dyn_section(layout), | |
1481 | elfcpp::R_X86_64_DTPMOD64, | |
1482 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1483 | } |
1484 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1485 | { | |
1486 | // Create a GOT entry for the tp-relative offset. | |
1487 | Output_data_got<64, false>* got | |
1488 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1489 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1490 | target->rela_dyn_section(layout), |
1491 | elfcpp::R_X86_64_TPOFF64); | |
1492 | } | |
1493 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1494 | unsupported_reloc_global(object, r_type, gsym); | |
1495 | break; | |
1496 | ||
56622147 | 1497 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1498 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1499 | if (optimized_type == tls::TLSOPT_NONE) |
1500 | { | |
1501 | // Create reserved PLT and GOT entries for the resolver. | |
1502 | target->reserve_tlsdesc_entries(symtab, layout); | |
1503 | ||
1504 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1505 | Output_data_got<64, false>* got | |
1506 | = target->got_section(symtab, layout); | |
1507 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1508 | target->rela_dyn_section(layout), | |
1509 | elfcpp::R_X86_64_TLSDESC, 0); | |
1510 | } | |
1511 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1512 | { | |
1513 | // Create a GOT entry for the tp-relative offset. | |
1514 | Output_data_got<64, false>* got | |
1515 | = target->got_section(symtab, layout); | |
1516 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1517 | target->rela_dyn_section(layout), | |
1518 | elfcpp::R_X86_64_TPOFF64); | |
1519 | } | |
1520 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1521 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1522 | break; |
1523 | ||
c2b45e22 CC |
1524 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1525 | break; | |
1526 | ||
e041f13d | 1527 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1528 | if (optimized_type == tls::TLSOPT_NONE) |
1529 | { | |
1530 | // Create a GOT entry for the module index. | |
31d60480 | 1531 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1532 | } |
1533 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1534 | unsupported_reloc_global(object, r_type, gsym); | |
1535 | break; | |
1536 | ||
0ffd9845 ILT |
1537 | case elfcpp::R_X86_64_DTPOFF32: |
1538 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1539 | break; |
1540 | ||
56622147 | 1541 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1542 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1543 | if (optimized_type == tls::TLSOPT_NONE) |
1544 | { | |
1545 | // Create a GOT entry for the tp-relative offset. | |
1546 | Output_data_got<64, false>* got | |
1547 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1548 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1549 | target->rela_dyn_section(layout), |
1550 | elfcpp::R_X86_64_TPOFF64); | |
1551 | } | |
1552 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1553 | unsupported_reloc_global(object, r_type, gsym); |
1554 | break; | |
0ffd9845 | 1555 | |
56622147 | 1556 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1557 | layout->set_has_static_tls(); |
8851ecca | 1558 | if (parameters->options().shared()) |
7bf1f802 | 1559 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1560 | break; |
e041f13d ILT |
1561 | |
1562 | default: | |
1563 | gold_unreachable(); | |
2e30d253 ILT |
1564 | } |
1565 | } | |
1566 | break; | |
fdc2f80f ILT |
1567 | |
1568 | case elfcpp::R_X86_64_SIZE32: | |
1569 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1570 | default: |
75f2446e | 1571 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1572 | object->name().c_str(), r_type, |
1573 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1574 | break; |
1575 | } | |
1576 | } | |
1577 | ||
6d03d481 ST |
1578 | void |
1579 | Target_x86_64::gc_process_relocs(const General_options& options, | |
1580 | Symbol_table* symtab, | |
1581 | Layout* layout, | |
1582 | Sized_relobj<64, false>* object, | |
1583 | unsigned int data_shndx, | |
1584 | unsigned int sh_type, | |
1585 | const unsigned char* prelocs, | |
1586 | size_t reloc_count, | |
1587 | Output_section* output_section, | |
1588 | bool needs_special_offset_handling, | |
1589 | size_t local_symbol_count, | |
1590 | const unsigned char* plocal_symbols) | |
1591 | { | |
1592 | ||
1593 | if (sh_type == elfcpp::SHT_REL) | |
1594 | { | |
1595 | return; | |
1596 | } | |
1597 | ||
1598 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1599 | Target_x86_64::Scan>( | |
1600 | options, | |
1601 | symtab, | |
1602 | layout, | |
1603 | this, | |
1604 | object, | |
1605 | data_shndx, | |
1606 | prelocs, | |
1607 | reloc_count, | |
1608 | output_section, | |
1609 | needs_special_offset_handling, | |
1610 | local_symbol_count, | |
1611 | plocal_symbols); | |
1612 | ||
1613 | } | |
2e30d253 ILT |
1614 | // Scan relocations for a section. |
1615 | ||
1616 | void | |
1617 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1618 | Symbol_table* symtab, |
1619 | Layout* layout, | |
1620 | Sized_relobj<64, false>* object, | |
1621 | unsigned int data_shndx, | |
1622 | unsigned int sh_type, | |
1623 | const unsigned char* prelocs, | |
1624 | size_t reloc_count, | |
730cdc88 ILT |
1625 | Output_section* output_section, |
1626 | bool needs_special_offset_handling, | |
d61c17ea | 1627 | size_t local_symbol_count, |
730cdc88 | 1628 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1629 | { |
1630 | if (sh_type == elfcpp::SHT_REL) | |
1631 | { | |
75f2446e ILT |
1632 | gold_error(_("%s: unsupported REL reloc section"), |
1633 | object->name().c_str()); | |
1634 | return; | |
2e30d253 ILT |
1635 | } |
1636 | ||
1637 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1638 | Target_x86_64::Scan>( | |
1639 | options, | |
1640 | symtab, | |
1641 | layout, | |
1642 | this, | |
1643 | object, | |
1644 | data_shndx, | |
1645 | prelocs, | |
1646 | reloc_count, | |
730cdc88 ILT |
1647 | output_section, |
1648 | needs_special_offset_handling, | |
2e30d253 | 1649 | local_symbol_count, |
730cdc88 | 1650 | plocal_symbols); |
2e30d253 ILT |
1651 | } |
1652 | ||
1653 | // Finalize the sections. | |
1654 | ||
1655 | void | |
1656 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1657 | { | |
1658 | // Fill in some more dynamic tags. | |
1659 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1660 | if (odyn != NULL) | |
1661 | { | |
1662 | if (this->got_plt_ != NULL) | |
1663 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1664 | ||
1665 | if (this->plt_ != NULL) | |
1666 | { | |
1667 | const Output_data* od = this->plt_->rel_plt(); | |
1668 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1669 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1670 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1671 | if (this->plt_->has_tlsdesc_entry()) |
1672 | { | |
1673 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1674 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1675 | this->got_->finalize_data_size(); | |
1676 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1677 | this->plt_, plt_offset); | |
1678 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1679 | this->got_, got_offset); | |
1680 | } | |
2e30d253 ILT |
1681 | } |
1682 | ||
0ffd9845 | 1683 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1684 | { |
0ffd9845 | 1685 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1686 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1687 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1688 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1689 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1690 | } |
1691 | ||
8851ecca | 1692 | if (!parameters->options().shared()) |
2e30d253 ILT |
1693 | { |
1694 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1695 | // linker at run time, and used by the debugger. | |
1696 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1701 | // relocs. | |
12c0daef ILT |
1702 | if (this->copy_relocs_.any_saved_relocs()) |
1703 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1704 | } |
1705 | ||
1706 | // Perform a relocation. | |
1707 | ||
1708 | inline bool | |
1709 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1710 | Target_x86_64* target, | |
031cdbed | 1711 | Output_section*, |
2e30d253 | 1712 | size_t relnum, |
0ffd9845 | 1713 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1714 | unsigned int r_type, |
1715 | const Sized_symbol<64>* gsym, | |
1716 | const Symbol_value<64>* psymval, | |
1717 | unsigned char* view, | |
1718 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1719 | section_size_type view_size) |
2e30d253 ILT |
1720 | { |
1721 | if (this->skip_call_tls_get_addr_) | |
1722 | { | |
5efc7cd2 CC |
1723 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1724 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1725 | || gsym == NULL |
0ffd9845 | 1726 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1727 | { |
75f2446e ILT |
1728 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1729 | _("missing expected TLS relocation")); | |
1730 | } | |
1731 | else | |
1732 | { | |
1733 | this->skip_call_tls_get_addr_ = false; | |
1734 | return false; | |
2e30d253 | 1735 | } |
2e30d253 ILT |
1736 | } |
1737 | ||
1738 | // Pick the value to use for symbols defined in shared objects. | |
1739 | Symbol_value<64> symval; | |
96f2030e | 1740 | if (gsym != NULL |
de4c45bd ILT |
1741 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1742 | || r_type == elfcpp::R_X86_64_PC32 | |
1743 | || r_type == elfcpp::R_X86_64_PC16 | |
1744 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1745 | { |
1746 | symval.set_output_value(target->plt_section()->address() | |
1747 | + gsym->plt_offset()); | |
1748 | psymval = &symval; | |
1749 | } | |
1750 | ||
1751 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1752 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1753 | ||
1754 | // Get the GOT offset if needed. | |
96f2030e ILT |
1755 | // The GOT pointer points to the end of the GOT section. |
1756 | // We need to subtract the size of the GOT section to get | |
1757 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1758 | bool have_got_offset = false; |
1759 | unsigned int got_offset = 0; | |
1760 | switch (r_type) | |
1761 | { | |
1762 | case elfcpp::R_X86_64_GOT32: | |
1763 | case elfcpp::R_X86_64_GOT64: | |
1764 | case elfcpp::R_X86_64_GOTPLT64: | |
1765 | case elfcpp::R_X86_64_GOTPCREL: | |
1766 | case elfcpp::R_X86_64_GOTPCREL64: | |
1767 | if (gsym != NULL) | |
1768 | { | |
0a65a3a7 CC |
1769 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1770 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1771 | } |
1772 | else | |
1773 | { | |
1774 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1775 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1776 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1777 | - target->got_size()); | |
0ffd9845 ILT |
1778 | } |
1779 | have_got_offset = true; | |
1780 | break; | |
1781 | ||
1782 | default: | |
1783 | break; | |
1784 | } | |
2e30d253 ILT |
1785 | |
1786 | switch (r_type) | |
1787 | { | |
1788 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1789 | case elfcpp::R_386_GNU_VTINHERIT: |
1790 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1791 | break; |
1792 | ||
1793 | case elfcpp::R_X86_64_64: | |
1794 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1795 | break; | |
1796 | ||
1797 | case elfcpp::R_X86_64_PC64: | |
1798 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1799 | address); | |
1800 | break; | |
1801 | ||
1802 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1803 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1804 | // uint64_t x = value + addend; | |
1805 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1806 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1807 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1808 | break; | |
1809 | ||
1810 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1811 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1812 | // int64_t x = value + addend; // note this quantity is signed! | |
1813 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1814 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1815 | break; | |
1816 | ||
1817 | case elfcpp::R_X86_64_PC32: | |
1818 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1819 | address); | |
1820 | break; | |
1821 | ||
1822 | case elfcpp::R_X86_64_16: | |
1823 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1824 | break; | |
1825 | ||
1826 | case elfcpp::R_X86_64_PC16: | |
1827 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1828 | address); | |
1829 | break; | |
1830 | ||
1831 | case elfcpp::R_X86_64_8: | |
1832 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1833 | break; | |
1834 | ||
1835 | case elfcpp::R_X86_64_PC8: | |
1836 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1837 | address); | |
1838 | break; | |
1839 | ||
1840 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1841 | gold_assert(gsym == NULL |
1842 | || gsym->has_plt_offset() | |
99f8faca ILT |
1843 | || gsym->final_value_is_known() |
1844 | || (gsym->is_defined() | |
1845 | && !gsym->is_from_dynobj() | |
1846 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1847 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1848 | // behaves differently because psymval was set to point to | |
1849 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1850 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1851 | address); | |
1852 | break; | |
1853 | ||
ee9e9e86 ILT |
1854 | case elfcpp::R_X86_64_PLTOFF64: |
1855 | { | |
1856 | gold_assert(gsym); | |
1857 | gold_assert(gsym->has_plt_offset() | |
1858 | || gsym->final_value_is_known()); | |
1859 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1860 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1861 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1862 | addend - got_address); | |
ee9e9e86 ILT |
1863 | } |
1864 | ||
2e30d253 | 1865 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1866 | gold_assert(have_got_offset); |
1867 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1868 | break; |
1869 | ||
e822f2b1 ILT |
1870 | case elfcpp::R_X86_64_GOTPC32: |
1871 | { | |
1872 | gold_assert(gsym); | |
1873 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1874 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1875 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1876 | } | |
1877 | break; | |
1878 | ||
1879 | case elfcpp::R_X86_64_GOT64: | |
1880 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1881 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1882 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1883 | gold_assert(have_got_offset); |
1884 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1885 | break; |
1886 | ||
1887 | case elfcpp::R_X86_64_GOTPC64: | |
1888 | { | |
1889 | gold_assert(gsym); | |
1890 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1891 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1892 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1893 | } | |
1894 | break; | |
1895 | ||
2e30d253 ILT |
1896 | case elfcpp::R_X86_64_GOTOFF64: |
1897 | { | |
1898 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1899 | value = (psymval->value(object, 0) | |
96f2030e | 1900 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1901 | Relocate_functions<64, false>::rela64(view, value, addend); |
1902 | } | |
1903 | break; | |
1904 | ||
1905 | case elfcpp::R_X86_64_GOTPCREL: | |
1906 | { | |
0ffd9845 ILT |
1907 | gold_assert(have_got_offset); |
1908 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1909 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1910 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1911 | } |
1912 | break; | |
1913 | ||
e822f2b1 ILT |
1914 | case elfcpp::R_X86_64_GOTPCREL64: |
1915 | { | |
0ffd9845 ILT |
1916 | gold_assert(have_got_offset); |
1917 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1918 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1919 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1920 | } |
1921 | break; | |
1922 | ||
2e30d253 ILT |
1923 | case elfcpp::R_X86_64_COPY: |
1924 | case elfcpp::R_X86_64_GLOB_DAT: | |
1925 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1926 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1927 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1928 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1929 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1930 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1931 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1932 | _("unexpected reloc %u in object file"), | |
1933 | r_type); | |
2e30d253 ILT |
1934 | break; |
1935 | ||
d61c17ea | 1936 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1937 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1938 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1939 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1940 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1941 | case elfcpp::R_X86_64_DTPOFF32: |
1942 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1943 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1944 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1945 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1946 | view, address, view_size); | |
2e30d253 | 1947 | break; |
2e30d253 | 1948 | |
fdc2f80f ILT |
1949 | case elfcpp::R_X86_64_SIZE32: |
1950 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1951 | default: |
75f2446e ILT |
1952 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1953 | _("unsupported reloc %u"), | |
1954 | r_type); | |
2e30d253 ILT |
1955 | break; |
1956 | } | |
1957 | ||
1958 | return true; | |
1959 | } | |
1960 | ||
1961 | // Perform a TLS relocation. | |
1962 | ||
1963 | inline void | |
d61c17ea | 1964 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1965 | Target_x86_64* target, |
d61c17ea | 1966 | size_t relnum, |
72ec2876 | 1967 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1968 | unsigned int r_type, |
1969 | const Sized_symbol<64>* gsym, | |
1970 | const Symbol_value<64>* psymval, | |
1971 | unsigned char* view, | |
6a41d30b | 1972 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1973 | section_size_type view_size) |
2e30d253 | 1974 | { |
2e30d253 | 1975 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1976 | |
1977 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1978 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1979 | |
1980 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1981 | ||
1982 | const bool is_final = (gsym == NULL | |
8851ecca | 1983 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1984 | : gsym->final_value_is_known()); |
e041f13d ILT |
1985 | const tls::Tls_optimization optimized_type |
1986 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1987 | switch (r_type) |
1988 | { | |
56622147 | 1989 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1990 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1991 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1992 | { |
7bf1f802 | 1993 | gold_assert(tls_segment != NULL); |
2e30d253 | 1994 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1995 | rela, r_type, value, view, |
2e30d253 ILT |
1996 | view_size); |
1997 | break; | |
1998 | } | |
7bf1f802 ILT |
1999 | else |
2000 | { | |
c2b45e22 CC |
2001 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2002 | ? GOT_TYPE_TLS_OFFSET | |
2003 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2004 | unsigned int got_offset; |
2005 | if (gsym != NULL) | |
2006 | { | |
c2b45e22 CC |
2007 | gold_assert(gsym->has_got_offset(got_type)); |
2008 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2009 | } |
2010 | else | |
2011 | { | |
2012 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2013 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2014 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2015 | - target->got_size()); |
2016 | } | |
2017 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2018 | { | |
2019 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2020 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2021 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2022 | value, view, address, view_size); |
7bf1f802 ILT |
2023 | break; |
2024 | } | |
2025 | else if (optimized_type == tls::TLSOPT_NONE) | |
2026 | { | |
2027 | // Relocate the field with the offset of the pair of GOT | |
2028 | // entries. | |
6a41d30b ILT |
2029 | value = target->got_plt_section()->address() + got_offset; |
2030 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2031 | address); | |
7bf1f802 ILT |
2032 | break; |
2033 | } | |
2034 | } | |
72ec2876 | 2035 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2036 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2037 | break; |
2038 | ||
c2b45e22 CC |
2039 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2040 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2041 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2042 | if (optimized_type == tls::TLSOPT_TO_LE) |
2043 | { | |
2044 | gold_assert(tls_segment != NULL); | |
2045 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2046 | rela, r_type, value, view, | |
2047 | view_size); | |
2048 | break; | |
2049 | } | |
2050 | else | |
2051 | { | |
2052 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2053 | ? GOT_TYPE_TLS_OFFSET | |
2054 | : GOT_TYPE_TLS_DESC); | |
2055 | unsigned int got_offset; | |
2056 | if (gsym != NULL) | |
2057 | { | |
2058 | gold_assert(gsym->has_got_offset(got_type)); | |
2059 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2060 | } | |
2061 | else | |
2062 | { | |
2063 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2064 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2065 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2066 | - target->got_size()); | |
2067 | } | |
2068 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2069 | { | |
2070 | gold_assert(tls_segment != NULL); | |
2071 | value = target->got_plt_section()->address() + got_offset; | |
2072 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2073 | rela, r_type, value, view, address, | |
2074 | view_size); | |
2075 | break; | |
2076 | } | |
2077 | else if (optimized_type == tls::TLSOPT_NONE) | |
2078 | { | |
2079 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2080 | { | |
2081 | // Relocate the field with the offset of the pair of GOT | |
2082 | // entries. | |
2083 | value = target->got_plt_section()->address() + got_offset; | |
2084 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2085 | address); | |
2086 | } | |
2087 | break; | |
2088 | } | |
2089 | } | |
2090 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2091 | _("unsupported reloc %u"), r_type); | |
2092 | break; | |
2093 | ||
56622147 | 2094 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2095 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2096 | if (optimized_type == tls::TLSOPT_TO_LE) |
2097 | { | |
7bf1f802 | 2098 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2099 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2100 | value, view, view_size); | |
2101 | break; | |
e041f13d | 2102 | } |
7bf1f802 ILT |
2103 | else if (optimized_type == tls::TLSOPT_NONE) |
2104 | { | |
2105 | // Relocate the field with the offset of the GOT entry for | |
2106 | // the module index. | |
2107 | unsigned int got_offset; | |
31d60480 ILT |
2108 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2109 | - target->got_size()); | |
6a41d30b ILT |
2110 | value = target->got_plt_section()->address() + got_offset; |
2111 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2112 | address); | |
7bf1f802 ILT |
2113 | break; |
2114 | } | |
72ec2876 | 2115 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2116 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2117 | break; |
0ffd9845 ILT |
2118 | |
2119 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2120 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2121 | { |
2122 | // This relocation type is used in debugging information. | |
2123 | // In that case we need to not optimize the value. If we | |
2124 | // haven't seen a TLSLD reloc, then we assume we should not | |
2125 | // optimize this reloc. | |
2126 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2127 | { |
2128 | gold_assert(tls_segment != NULL); | |
2129 | value -= tls_segment->memsz(); | |
2130 | } | |
497897f9 | 2131 | } |
d85c80a3 | 2132 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2133 | break; |
2134 | ||
2135 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2136 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2137 | { |
2138 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2139 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2140 | { |
2141 | gold_assert(tls_segment != NULL); | |
2142 | value -= tls_segment->memsz(); | |
2143 | } | |
497897f9 | 2144 | } |
d85c80a3 | 2145 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2146 | break; |
2e30d253 | 2147 | |
56622147 ILT |
2148 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2149 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2150 | { | |
7bf1f802 | 2151 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2152 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2153 | rela, r_type, value, view, | |
2154 | view_size); | |
2155 | break; | |
2156 | } | |
7bf1f802 ILT |
2157 | else if (optimized_type == tls::TLSOPT_NONE) |
2158 | { | |
2159 | // Relocate the field with the offset of the GOT entry for | |
2160 | // the tp-relative offset of the symbol. | |
2161 | unsigned int got_offset; | |
2162 | if (gsym != NULL) | |
2163 | { | |
0a65a3a7 CC |
2164 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2165 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2166 | - target->got_size()); | |
7bf1f802 ILT |
2167 | } |
2168 | else | |
2169 | { | |
2170 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2171 | gold_assert(object->local_has_got_offset(r_sym, |
2172 | GOT_TYPE_TLS_OFFSET)); | |
2173 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2174 | - target->got_size()); |
2175 | } | |
6a41d30b ILT |
2176 | value = target->got_plt_section()->address() + got_offset; |
2177 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2178 | break; |
2179 | } | |
56622147 ILT |
2180 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2181 | _("unsupported reloc type %u"), | |
2182 | r_type); | |
2183 | break; | |
0ffd9845 | 2184 | |
56622147 | 2185 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2186 | value -= tls_segment->memsz(); |
d85c80a3 | 2187 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2188 | break; |
2e30d253 | 2189 | } |
2e30d253 ILT |
2190 | } |
2191 | ||
7bf1f802 ILT |
2192 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2193 | // Initial-Exec. | |
2194 | ||
2195 | inline void | |
2196 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2197 | size_t relnum, | |
c2b45e22 | 2198 | Output_segment*, |
7bf1f802 ILT |
2199 | const elfcpp::Rela<64, false>& rela, |
2200 | unsigned int, | |
2201 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2202 | unsigned char* view, | |
c2b45e22 | 2203 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2204 | section_size_type view_size) |
7bf1f802 ILT |
2205 | { |
2206 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2207 | // .word 0x6666; rex64; call __tls_get_addr | |
2208 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2209 | ||
2210 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2211 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2212 | ||
2213 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2214 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2215 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2216 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2217 | ||
2218 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2219 | ||
c2b45e22 CC |
2220 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2221 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2222 | |
2223 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2224 | // We can skip it. | |
2225 | this->skip_call_tls_get_addr_ = true; | |
2226 | } | |
2227 | ||
e041f13d | 2228 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2229 | // Local-Exec. |
2230 | ||
2231 | inline void | |
d61c17ea ILT |
2232 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2233 | size_t relnum, | |
2234 | Output_segment* tls_segment, | |
72ec2876 | 2235 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2236 | unsigned int, |
2237 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2238 | unsigned char* view, | |
fe8718a4 | 2239 | section_size_type view_size) |
2e30d253 | 2240 | { |
0ffd9845 ILT |
2241 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2242 | // .word 0x6666; rex64; call __tls_get_addr | |
2243 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2244 | |
72ec2876 ILT |
2245 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2246 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2247 | |
72ec2876 ILT |
2248 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2249 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2250 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2251 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2252 | |
0ffd9845 | 2253 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2254 | |
6a41d30b | 2255 | value -= tls_segment->memsz(); |
0ffd9845 | 2256 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2257 | |
2258 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2259 | // We can skip it. | |
2260 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2261 | } |
2262 | ||
c2b45e22 CC |
2263 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2264 | ||
2265 | inline void | |
2266 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2267 | const Relocate_info<64, false>* relinfo, | |
2268 | size_t relnum, | |
2269 | Output_segment*, | |
2270 | const elfcpp::Rela<64, false>& rela, | |
2271 | unsigned int r_type, | |
2272 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2273 | unsigned char* view, | |
2274 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2275 | section_size_type view_size) | |
2276 | { | |
2277 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2278 | { | |
2279 | // leaq foo@tlsdesc(%rip), %rax | |
2280 | // ==> movq foo@gottpoff(%rip), %rax | |
2281 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2282 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2283 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2284 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2285 | view[-2] = 0x8b; | |
2286 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2287 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2288 | } | |
2289 | else | |
2290 | { | |
2291 | // call *foo@tlscall(%rax) | |
2292 | // ==> nop; nop | |
2293 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2294 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2295 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2296 | view[0] == 0xff && view[1] == 0x10); | |
2297 | view[0] = 0x66; | |
2298 | view[1] = 0x90; | |
2299 | } | |
2300 | } | |
2301 | ||
2302 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2303 | ||
2304 | inline void | |
2305 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2306 | const Relocate_info<64, false>* relinfo, | |
2307 | size_t relnum, | |
2308 | Output_segment* tls_segment, | |
2309 | const elfcpp::Rela<64, false>& rela, | |
2310 | unsigned int r_type, | |
2311 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2312 | unsigned char* view, | |
2313 | section_size_type view_size) | |
2314 | { | |
2315 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2316 | { | |
2317 | // leaq foo@tlsdesc(%rip), %rax | |
2318 | // ==> movq foo@tpoff, %rax | |
2319 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2320 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2321 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2322 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2323 | view[-2] = 0xc7; | |
2324 | view[-1] = 0xc0; | |
2325 | value -= tls_segment->memsz(); | |
2326 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2327 | } | |
2328 | else | |
2329 | { | |
2330 | // call *foo@tlscall(%rax) | |
2331 | // ==> nop; nop | |
2332 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2333 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2334 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2335 | view[0] == 0xff && view[1] == 0x10); | |
2336 | view[0] = 0x66; | |
2337 | view[1] = 0x90; | |
2338 | } | |
2339 | } | |
2340 | ||
2e30d253 | 2341 | inline void |
72ec2876 ILT |
2342 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2343 | size_t relnum, | |
2344 | Output_segment*, | |
2345 | const elfcpp::Rela<64, false>& rela, | |
2346 | unsigned int, | |
2347 | elfcpp::Elf_types<64>::Elf_Addr, | |
2348 | unsigned char* view, | |
fe8718a4 | 2349 | section_size_type view_size) |
2e30d253 | 2350 | { |
72ec2876 ILT |
2351 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2352 | // ... leq foo@dtpoff(%rax),%reg | |
2353 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2354 | |
72ec2876 ILT |
2355 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2356 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2357 | |
72ec2876 ILT |
2358 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2359 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2360 | ||
2361 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2362 | ||
2363 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2364 | ||
2365 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2366 | // We can skip it. | |
2367 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2368 | } |
2369 | ||
56622147 ILT |
2370 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2371 | // Local-Exec. | |
2372 | ||
2373 | inline void | |
2374 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2375 | size_t relnum, | |
2376 | Output_segment* tls_segment, | |
2377 | const elfcpp::Rela<64, false>& rela, | |
2378 | unsigned int, | |
2379 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2380 | unsigned char* view, | |
fe8718a4 | 2381 | section_size_type view_size) |
56622147 ILT |
2382 | { |
2383 | // We need to examine the opcodes to figure out which instruction we | |
2384 | // are looking at. | |
2385 | ||
2386 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2387 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2388 | ||
2389 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2390 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2391 | ||
2392 | unsigned char op1 = view[-3]; | |
2393 | unsigned char op2 = view[-2]; | |
2394 | unsigned char op3 = view[-1]; | |
2395 | unsigned char reg = op3 >> 3; | |
2396 | ||
2397 | if (op2 == 0x8b) | |
2398 | { | |
2399 | // movq | |
2400 | if (op1 == 0x4c) | |
2401 | view[-3] = 0x49; | |
2402 | view[-2] = 0xc7; | |
2403 | view[-1] = 0xc0 | reg; | |
2404 | } | |
2405 | else if (reg == 4) | |
2406 | { | |
2407 | // Special handling for %rsp. | |
2408 | if (op1 == 0x4c) | |
2409 | view[-3] = 0x49; | |
2410 | view[-2] = 0x81; | |
2411 | view[-1] = 0xc0 | reg; | |
2412 | } | |
2413 | else | |
2414 | { | |
2415 | // addq | |
2416 | if (op1 == 0x4c) | |
2417 | view[-3] = 0x4d; | |
2418 | view[-2] = 0x8d; | |
2419 | view[-1] = 0x80 | reg | (reg << 3); | |
2420 | } | |
2421 | ||
6a41d30b | 2422 | value -= tls_segment->memsz(); |
56622147 ILT |
2423 | Relocate_functions<64, false>::rela32(view, value, 0); |
2424 | } | |
2425 | ||
2e30d253 ILT |
2426 | // Relocate section data. |
2427 | ||
2428 | void | |
364c7fa5 ILT |
2429 | Target_x86_64::relocate_section( |
2430 | const Relocate_info<64, false>* relinfo, | |
2431 | unsigned int sh_type, | |
2432 | const unsigned char* prelocs, | |
2433 | size_t reloc_count, | |
2434 | Output_section* output_section, | |
2435 | bool needs_special_offset_handling, | |
2436 | unsigned char* view, | |
2437 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2438 | section_size_type view_size, | |
2439 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2440 | { |
2441 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2442 | ||
2443 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2444 | Target_x86_64::Relocate>( | |
2445 | relinfo, | |
2446 | this, | |
2447 | prelocs, | |
2448 | reloc_count, | |
730cdc88 ILT |
2449 | output_section, |
2450 | needs_special_offset_handling, | |
2e30d253 ILT |
2451 | view, |
2452 | address, | |
364c7fa5 ILT |
2453 | view_size, |
2454 | reloc_symbol_changes); | |
2e30d253 ILT |
2455 | } |
2456 | ||
6a74a719 ILT |
2457 | // Return the size of a relocation while scanning during a relocatable |
2458 | // link. | |
2459 | ||
2460 | unsigned int | |
2461 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2462 | unsigned int r_type, | |
2463 | Relobj* object) | |
2464 | { | |
2465 | switch (r_type) | |
2466 | { | |
2467 | case elfcpp::R_X86_64_NONE: | |
2468 | case elfcpp::R_386_GNU_VTINHERIT: | |
2469 | case elfcpp::R_386_GNU_VTENTRY: | |
2470 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2471 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2472 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2473 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2474 | case elfcpp::R_X86_64_DTPOFF32: | |
2475 | case elfcpp::R_X86_64_DTPOFF64: | |
2476 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2477 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2478 | return 0; | |
2479 | ||
2480 | case elfcpp::R_X86_64_64: | |
2481 | case elfcpp::R_X86_64_PC64: | |
2482 | case elfcpp::R_X86_64_GOTOFF64: | |
2483 | case elfcpp::R_X86_64_GOTPC64: | |
2484 | case elfcpp::R_X86_64_PLTOFF64: | |
2485 | case elfcpp::R_X86_64_GOT64: | |
2486 | case elfcpp::R_X86_64_GOTPCREL64: | |
2487 | case elfcpp::R_X86_64_GOTPCREL: | |
2488 | case elfcpp::R_X86_64_GOTPLT64: | |
2489 | return 8; | |
2490 | ||
2491 | case elfcpp::R_X86_64_32: | |
2492 | case elfcpp::R_X86_64_32S: | |
2493 | case elfcpp::R_X86_64_PC32: | |
2494 | case elfcpp::R_X86_64_PLT32: | |
2495 | case elfcpp::R_X86_64_GOTPC32: | |
2496 | case elfcpp::R_X86_64_GOT32: | |
2497 | return 4; | |
2498 | ||
2499 | case elfcpp::R_X86_64_16: | |
2500 | case elfcpp::R_X86_64_PC16: | |
2501 | return 2; | |
2502 | ||
2503 | case elfcpp::R_X86_64_8: | |
2504 | case elfcpp::R_X86_64_PC8: | |
2505 | return 1; | |
2506 | ||
2507 | case elfcpp::R_X86_64_COPY: | |
2508 | case elfcpp::R_X86_64_GLOB_DAT: | |
2509 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2510 | case elfcpp::R_X86_64_RELATIVE: | |
2511 | // These are outstanding tls relocs, which are unexpected when linking | |
2512 | case elfcpp::R_X86_64_TPOFF64: | |
2513 | case elfcpp::R_X86_64_DTPMOD64: | |
2514 | case elfcpp::R_X86_64_TLSDESC: | |
2515 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2516 | return 0; | |
2517 | ||
2518 | case elfcpp::R_X86_64_SIZE32: | |
2519 | case elfcpp::R_X86_64_SIZE64: | |
2520 | default: | |
2521 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2522 | return 0; | |
2523 | } | |
2524 | } | |
2525 | ||
2526 | // Scan the relocs during a relocatable link. | |
2527 | ||
2528 | void | |
2529 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2530 | Symbol_table* symtab, | |
2531 | Layout* layout, | |
2532 | Sized_relobj<64, false>* object, | |
2533 | unsigned int data_shndx, | |
2534 | unsigned int sh_type, | |
2535 | const unsigned char* prelocs, | |
2536 | size_t reloc_count, | |
2537 | Output_section* output_section, | |
2538 | bool needs_special_offset_handling, | |
2539 | size_t local_symbol_count, | |
2540 | const unsigned char* plocal_symbols, | |
2541 | Relocatable_relocs* rr) | |
2542 | { | |
2543 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2544 | ||
2545 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2546 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2547 | ||
7019cd25 | 2548 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2549 | Scan_relocatable_relocs>( |
2550 | options, | |
2551 | symtab, | |
2552 | layout, | |
2553 | object, | |
2554 | data_shndx, | |
2555 | prelocs, | |
2556 | reloc_count, | |
2557 | output_section, | |
2558 | needs_special_offset_handling, | |
2559 | local_symbol_count, | |
2560 | plocal_symbols, | |
2561 | rr); | |
2562 | } | |
2563 | ||
2564 | // Relocate a section during a relocatable link. | |
2565 | ||
2566 | void | |
2567 | Target_x86_64::relocate_for_relocatable( | |
2568 | const Relocate_info<64, false>* relinfo, | |
2569 | unsigned int sh_type, | |
2570 | const unsigned char* prelocs, | |
2571 | size_t reloc_count, | |
2572 | Output_section* output_section, | |
2573 | off_t offset_in_output_section, | |
2574 | const Relocatable_relocs* rr, | |
2575 | unsigned char* view, | |
2576 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2577 | section_size_type view_size, | |
2578 | unsigned char* reloc_view, | |
2579 | section_size_type reloc_view_size) | |
2580 | { | |
2581 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2582 | ||
7019cd25 | 2583 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2584 | relinfo, |
2585 | prelocs, | |
2586 | reloc_count, | |
2587 | output_section, | |
2588 | offset_in_output_section, | |
2589 | rr, | |
2590 | view, | |
2591 | view_address, | |
2592 | view_size, | |
2593 | reloc_view, | |
2594 | reloc_view_size); | |
2595 | } | |
2596 | ||
4fb6c25d ILT |
2597 | // Return the value to use for a dynamic which requires special |
2598 | // treatment. This is how we support equality comparisons of function | |
2599 | // pointers across shared library boundaries, as described in the | |
2600 | // processor specific ABI supplement. | |
2601 | ||
2602 | uint64_t | |
2603 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2604 | { | |
2605 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2606 | return this->plt_section()->address() + gsym->plt_offset(); | |
2607 | } | |
2608 | ||
2e30d253 ILT |
2609 | // Return a string used to fill a code section with nops to take up |
2610 | // the specified length. | |
2611 | ||
2612 | std::string | |
8851ecca | 2613 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2614 | { |
2615 | if (length >= 16) | |
2616 | { | |
2617 | // Build a jmpq instruction to skip over the bytes. | |
2618 | unsigned char jmp[5]; | |
2619 | jmp[0] = 0xe9; | |
04bf7072 | 2620 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2621 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2622 | + std::string(length - 5, '\0')); | |
2623 | } | |
2624 | ||
2625 | // Nop sequences of various lengths. | |
2626 | const char nop1[1] = { 0x90 }; // nop | |
2627 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2628 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2629 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2630 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2631 | 0x00 }; | |
2632 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2633 | 0x00, 0x00 }; |
1caf2c51 | 2634 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2635 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2636 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2637 | 0x00, 0x00, 0x00, 0x00 }; | |
2638 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2639 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2640 | 0x00 }; |
1caf2c51 ILT |
2641 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2642 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2643 | 0x00, 0x00 }; |
1caf2c51 ILT |
2644 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2645 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2646 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2647 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2648 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2649 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2650 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2651 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2652 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2653 | 0x00 }; |
1caf2c51 ILT |
2654 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2655 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2656 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2657 | 0x00, 0x00 }; |
1caf2c51 ILT |
2658 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2659 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2660 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2661 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2662 | |
2663 | const char* nops[16] = { | |
2664 | NULL, | |
2665 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2666 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2667 | }; | |
2668 | ||
2669 | return std::string(nops[length], length); | |
2670 | } | |
2671 | ||
364c7fa5 ILT |
2672 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2673 | // compiled with -fstack-split. The function calls non-stack-split | |
2674 | // code. We have to change the function so that it always ensures | |
2675 | // that it has enough stack space to run some random function. | |
2676 | ||
2677 | void | |
2678 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2679 | section_offset_type fnoffset, | |
2680 | section_size_type fnsize, | |
2681 | unsigned char* view, | |
2682 | section_size_type view_size, | |
2683 | std::string* from, | |
2684 | std::string* to) const | |
2685 | { | |
2686 | // The function starts with a comparison of the stack pointer and a | |
2687 | // field in the TCB. This is followed by a jump. | |
2688 | ||
2689 | // cmp %fs:NN,%rsp | |
2690 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2691 | && fnsize > 9) | |
2692 | { | |
2693 | // We will call __morestack if the carry flag is set after this | |
2694 | // comparison. We turn the comparison into an stc instruction | |
2695 | // and some nops. | |
2696 | view[fnoffset] = '\xf9'; | |
2697 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2698 | } | |
2699 | // lea NN(%rsp),%r10 | |
2700 | else if (this->match_view(view, view_size, fnoffset, "\x4c\x8d\x94\x24", 4) | |
2701 | && fnsize > 8) | |
2702 | { | |
2703 | // This is loading an offset from the stack pointer for a | |
2704 | // comparison. The offset is negative, so we decrease the | |
2705 | // offset by the amount of space we need for the stack. This | |
2706 | // means we will avoid calling __morestack if there happens to | |
2707 | // be plenty of space on the stack already. | |
2708 | unsigned char* pval = view + fnoffset + 4; | |
2709 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2710 | val -= parameters->options().split_stack_adjust_size(); | |
2711 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2712 | } | |
2713 | else | |
2714 | { | |
2715 | if (!object->has_no_split_stack()) | |
2716 | object->error(_("failed to match split-stack sequence at " | |
2717 | "section %u offset %0zx"), | |
2718 | shndx, fnoffset); | |
2719 | return; | |
2720 | } | |
2721 | ||
2722 | // We have to change the function so that it calls | |
2723 | // __morestack_non_split instead of __morestack. The former will | |
2724 | // allocate additional stack space. | |
2725 | *from = "__morestack"; | |
2726 | *to = "__morestack_non_split"; | |
2727 | } | |
2728 | ||
2e30d253 ILT |
2729 | // The selector for x86_64 object files. |
2730 | ||
36959681 | 2731 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2732 | { |
2733 | public: | |
2734 | Target_selector_x86_64() | |
36959681 ILT |
2735 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2736 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2737 | { } |
2738 | ||
2739 | Target* | |
e96caa79 ILT |
2740 | do_instantiate_target() |
2741 | { return new Target_x86_64(); } | |
36959681 | 2742 | |
2e30d253 ILT |
2743 | }; |
2744 | ||
2e30d253 ILT |
2745 | Target_selector_x86_64 target_selector_x86_64; |
2746 | ||
2747 | } // End anonymous namespace. |