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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
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 | |
11 | // (at your option) any later version. | |
12 | ||
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. | |
22 | ||
14bfc3f5 | 23 | #include "gold.h" |
ead1e424 ILT |
24 | |
25 | #include <cstring> | |
26 | ||
14bfc3f5 | 27 | #include "elfcpp.h" |
7e1edb90 | 28 | #include "parameters.h" |
92e059d8 | 29 | #include "reloc.h" |
61ba1cf9 ILT |
30 | #include "i386.h" |
31 | #include "object.h" | |
ead1e424 | 32 | #include "symtab.h" |
92e059d8 ILT |
33 | #include "layout.h" |
34 | #include "output.h" | |
14bfc3f5 | 35 | #include "target.h" |
61ba1cf9 | 36 | #include "target-reloc.h" |
14bfc3f5 | 37 | #include "target-select.h" |
af6359d5 | 38 | #include "tls.h" |
14bfc3f5 ILT |
39 | |
40 | namespace | |
41 | { | |
42 | ||
43 | using namespace gold; | |
44 | ||
a3ad94ed ILT |
45 | class Output_data_plt_i386; |
46 | ||
14bfc3f5 | 47 | // The i386 target class. |
e041f13d ILT |
48 | // TLS info comes from |
49 | // http://people.redhat.com/drepper/tls.pdf | |
50 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 ILT |
51 | |
52 | class Target_i386 : public Sized_target<32, false> | |
53 | { | |
54 | public: | |
5a6f7e2d ILT |
55 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
56 | ||
14bfc3f5 | 57 | Target_i386() |
ead1e424 | 58 | : Sized_target<32, false>(&i386_info), |
5a6f7e2d ILT |
59 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
60 | copy_relocs_(NULL), dynbss_(NULL) | |
14bfc3f5 | 61 | { } |
75f65a3e | 62 | |
92e059d8 | 63 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 64 | void |
92e059d8 ILT |
65 | scan_relocs(const General_options& options, |
66 | Symbol_table* symtab, | |
ead1e424 | 67 | Layout* layout, |
f6ce93d6 | 68 | Sized_relobj<32, false>* object, |
a3ad94ed | 69 | unsigned int data_shndx, |
92e059d8 ILT |
70 | unsigned int sh_type, |
71 | const unsigned char* prelocs, | |
72 | size_t reloc_count, | |
730cdc88 ILT |
73 | Output_section* output_section, |
74 | bool needs_special_offset_handling, | |
92e059d8 | 75 | size_t local_symbol_count, |
730cdc88 | 76 | const unsigned char* plocal_symbols); |
61ba1cf9 | 77 | |
5a6f7e2d ILT |
78 | // Finalize the sections. |
79 | void | |
7e1edb90 | 80 | do_finalize_sections(Layout*); |
5a6f7e2d | 81 | |
ab5c9e90 ILT |
82 | // Return the value to use for a dynamic which requires special |
83 | // treatment. | |
84 | uint64_t | |
85 | do_dynsym_value(const Symbol*) const; | |
86 | ||
92e059d8 ILT |
87 | // Relocate a section. |
88 | void | |
89 | relocate_section(const Relocate_info<32, false>*, | |
90 | unsigned int sh_type, | |
91 | const unsigned char* prelocs, | |
92 | size_t reloc_count, | |
730cdc88 ILT |
93 | Output_section* output_section, |
94 | bool needs_special_offset_handling, | |
92e059d8 ILT |
95 | unsigned char* view, |
96 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
97 | off_t view_size); | |
98 | ||
c51e6221 ILT |
99 | // Return a string used to fill a code section with nops. |
100 | std::string | |
101 | do_code_fill(off_t length); | |
102 | ||
96f2030e ILT |
103 | // Return the size of the GOT section. |
104 | off_t | |
105 | got_size() | |
106 | { | |
107 | gold_assert(this->got_ != NULL); | |
108 | return this->got_->data_size(); | |
109 | } | |
110 | ||
92e059d8 ILT |
111 | private: |
112 | // The class which scans relocations. | |
113 | struct Scan | |
61ba1cf9 ILT |
114 | { |
115 | inline void | |
ead1e424 ILT |
116 | local(const General_options& options, Symbol_table* symtab, |
117 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 118 | Sized_relobj<32, false>* object, |
a3ad94ed | 119 | unsigned int data_shndx, |
92e059d8 ILT |
120 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
121 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 122 | |
92e059d8 | 123 | inline void |
ead1e424 ILT |
124 | global(const General_options& options, Symbol_table* symtab, |
125 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 126 | Sized_relobj<32, false>* object, |
a3ad94ed | 127 | unsigned int data_shndx, |
92e059d8 ILT |
128 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
129 | Symbol* gsym); | |
af6359d5 ILT |
130 | |
131 | static void | |
132 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
133 | ||
134 | static void | |
135 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
136 | Symbol*); | |
61ba1cf9 ILT |
137 | }; |
138 | ||
92e059d8 ILT |
139 | // The class which implements relocation. |
140 | class Relocate | |
141 | { | |
142 | public: | |
ead1e424 | 143 | Relocate() |
46cf9fa2 ILT |
144 | : skip_call_tls_get_addr_(false), |
145 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
146 | { } |
147 | ||
148 | ~Relocate() | |
149 | { | |
150 | if (this->skip_call_tls_get_addr_) | |
151 | { | |
152 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 153 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
154 | } |
155 | } | |
156 | ||
86849f1f ILT |
157 | // Return whether the static relocation needs to be applied. |
158 | inline bool | |
159 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
160 | bool is_pcrel, | |
161 | bool is_32bit); | |
162 | ||
ead1e424 ILT |
163 | // Do a relocation. Return false if the caller should not issue |
164 | // any warnings about this relocation. | |
165 | inline bool | |
166 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 167 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 168 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 169 | const Symbol_value<32>*, |
92e059d8 ILT |
170 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
171 | off_t); | |
172 | ||
173 | private: | |
174 | // Do a TLS relocation. | |
ead1e424 | 175 | inline void |
92e059d8 ILT |
176 | relocate_tls(const Relocate_info<32, false>*, size_t relnum, |
177 | const elfcpp::Rel<32, false>&, | |
c06b7b0b | 178 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 179 | const Symbol_value<32>*, |
92e059d8 ILT |
180 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, off_t); |
181 | ||
56622147 ILT |
182 | // Do a TLS General-Dynamic to Local-Exec transition. |
183 | inline void | |
184 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
185 | Output_segment* tls_segment, |
186 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
187 | elfcpp::Elf_types<32>::Elf_Addr value, | |
188 | unsigned char* view, | |
189 | off_t view_size); | |
190 | ||
56622147 | 191 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 192 | inline void |
56622147 | 193 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
194 | Output_segment* tls_segment, |
195 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
196 | elfcpp::Elf_types<32>::Elf_Addr value, | |
197 | unsigned char* view, | |
198 | off_t view_size); | |
199 | ||
56622147 ILT |
200 | // Do a TLS Initial-Exec to Local-Exec transition. |
201 | static inline void | |
202 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
203 | Output_segment* tls_segment, |
204 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
205 | elfcpp::Elf_types<32>::Elf_Addr value, | |
206 | unsigned char* view, | |
207 | off_t view_size); | |
208 | ||
46cf9fa2 ILT |
209 | // We need to keep track of which type of local dynamic relocation |
210 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
211 | enum Local_dynamic_type | |
212 | { | |
213 | LOCAL_DYNAMIC_NONE, | |
214 | LOCAL_DYNAMIC_SUN, | |
215 | LOCAL_DYNAMIC_GNU | |
216 | }; | |
217 | ||
ead1e424 ILT |
218 | // This is set if we should skip the next reloc, which should be a |
219 | // PLT32 reloc against ___tls_get_addr. | |
220 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
221 | // The type of local dynamic relocation we have seen in the section |
222 | // being relocated, if any. | |
223 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
224 | }; |
225 | ||
226 | // Adjust TLS relocation type based on the options and whether this | |
227 | // is a local symbol. | |
af6359d5 | 228 | static tls::Tls_optimization |
7e1edb90 | 229 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 230 | |
ead1e424 | 231 | // Get the GOT section, creating it if necessary. |
dbe717ef | 232 | Output_data_got<32, false>* |
7e1edb90 | 233 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 234 | |
96f2030e ILT |
235 | // Get the GOT PLT section. |
236 | Output_data_space* | |
237 | got_plt_section() const | |
238 | { | |
239 | gold_assert(this->got_plt_ != NULL); | |
240 | return this->got_plt_; | |
241 | } | |
242 | ||
a3ad94ed ILT |
243 | // Create a PLT entry for a global symbol. |
244 | void | |
7e1edb90 | 245 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed ILT |
246 | |
247 | // Get the PLT section. | |
7bb3655e | 248 | const Output_data_plt_i386* |
a3ad94ed ILT |
249 | plt_section() const |
250 | { | |
251 | gold_assert(this->plt_ != NULL); | |
252 | return this->plt_; | |
253 | } | |
254 | ||
5a6f7e2d ILT |
255 | // Get the dynamic reloc section, creating it if necessary. |
256 | Reloc_section* | |
257 | rel_dyn_section(Layout*); | |
258 | ||
a3ad94ed ILT |
259 | // Copy a relocation against a global symbol. |
260 | void | |
5a6f7e2d ILT |
261 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
262 | Sized_relobj<32, false>*, unsigned int, | |
a3ad94ed | 263 | Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 264 | |
92e059d8 ILT |
265 | // Information about this specific target which we pass to the |
266 | // general Target structure. | |
75f65a3e | 267 | static const Target::Target_info i386_info; |
ead1e424 ILT |
268 | |
269 | // The GOT section. | |
dbe717ef | 270 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
271 | // The PLT section. |
272 | Output_data_plt_i386* plt_; | |
273 | // The GOT PLT section. | |
274 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
275 | // The dynamic reloc section. |
276 | Reloc_section* rel_dyn_; | |
277 | // Relocs saved to avoid a COPY reloc. | |
278 | Copy_relocs<32, false>* copy_relocs_; | |
279 | // Space for variables copied with a COPY reloc. | |
280 | Output_data_space* dynbss_; | |
75f65a3e ILT |
281 | }; |
282 | ||
283 | const Target::Target_info Target_i386::i386_info = | |
284 | { | |
61ba1cf9 ILT |
285 | 32, // size |
286 | false, // is_big_endian | |
287 | elfcpp::EM_386, // machine_code | |
288 | false, // has_make_symbol | |
dbe717ef | 289 | false, // has_resolve |
c51e6221 | 290 | true, // has_code_fill |
35cdfc9a | 291 | true, // is_default_stack_executable |
dbe717ef | 292 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 293 | 0x08048000, // default_text_segment_address |
61ba1cf9 ILT |
294 | 0x1000, // abi_pagesize |
295 | 0x1000 // common_pagesize | |
14bfc3f5 ILT |
296 | }; |
297 | ||
ead1e424 ILT |
298 | // Get the GOT section, creating it if necessary. |
299 | ||
dbe717ef | 300 | Output_data_got<32, false>* |
7e1edb90 | 301 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
302 | { |
303 | if (this->got_ == NULL) | |
304 | { | |
7e1edb90 | 305 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 306 | |
7e1edb90 | 307 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 308 | |
ead1e424 | 309 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
310 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
311 | this->got_); | |
ead1e424 | 312 | |
a3ad94ed ILT |
313 | // The old GNU linker creates a .got.plt section. We just |
314 | // create another set of data in the .got section. Note that we | |
315 | // always create a PLT if we create a GOT, although the PLT | |
316 | // might be empty. | |
317 | this->got_plt_ = new Output_data_space(4); | |
318 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
319 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
320 | this->got_plt_); | |
a3ad94ed | 321 | |
ead1e424 | 322 | // The first three entries are reserved. |
a3ad94ed | 323 | this->got_plt_->set_space_size(3 * 4); |
ead1e424 | 324 | |
a3ad94ed | 325 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
14b31740 | 326 | symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 327 | this->got_plt_, |
ead1e424 | 328 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 329 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
330 | elfcpp::STV_HIDDEN, 0, |
331 | false, false); | |
332 | } | |
a3ad94ed | 333 | |
ead1e424 ILT |
334 | return this->got_; |
335 | } | |
336 | ||
5a6f7e2d ILT |
337 | // Get the dynamic reloc section, creating it if necessary. |
338 | ||
339 | Target_i386::Reloc_section* | |
340 | Target_i386::rel_dyn_section(Layout* layout) | |
341 | { | |
342 | if (this->rel_dyn_ == NULL) | |
343 | { | |
344 | gold_assert(layout != NULL); | |
345 | this->rel_dyn_ = new Reloc_section(); | |
346 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
347 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
348 | } | |
349 | return this->rel_dyn_; | |
350 | } | |
351 | ||
a3ad94ed ILT |
352 | // A class to handle the PLT data. |
353 | ||
354 | class Output_data_plt_i386 : public Output_section_data | |
355 | { | |
356 | public: | |
357 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
358 | ||
7e1edb90 | 359 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
360 | |
361 | // Add an entry to the PLT. | |
362 | void | |
363 | add_entry(Symbol* gsym); | |
364 | ||
16649710 ILT |
365 | // Return the .rel.plt section data. |
366 | const Reloc_section* | |
367 | rel_plt() const | |
368 | { return this->rel_; } | |
369 | ||
370 | protected: | |
371 | void | |
372 | do_adjust_output_section(Output_section* os); | |
373 | ||
a3ad94ed ILT |
374 | private: |
375 | // The size of an entry in the PLT. | |
376 | static const int plt_entry_size = 16; | |
377 | ||
378 | // The first entry in the PLT for an executable. | |
379 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
380 | ||
381 | // The first entry in the PLT for a shared object. | |
382 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
383 | ||
384 | // Other entries in the PLT for an executable. | |
385 | static unsigned char exec_plt_entry[plt_entry_size]; | |
386 | ||
387 | // Other entries in the PLT for a shared object. | |
388 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
389 | ||
390 | // Set the final size. | |
391 | void | |
392 | do_set_address(uint64_t, off_t) | |
393 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } | |
394 | ||
395 | // Write out the PLT data. | |
396 | void | |
397 | do_write(Output_file*); | |
398 | ||
399 | // The reloc section. | |
400 | Reloc_section* rel_; | |
401 | // The .got.plt section. | |
402 | Output_data_space* got_plt_; | |
403 | // The number of PLT entries. | |
404 | unsigned int count_; | |
a3ad94ed ILT |
405 | }; |
406 | ||
407 | // Create the PLT section. The ordinary .got section is an argument, | |
408 | // since we need to refer to the start. We also create our own .got | |
409 | // section just for PLT entries. | |
410 | ||
411 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 412 | Output_data_space* got_plt) |
80576242 | 413 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
414 | { |
415 | this->rel_ = new Reloc_section(); | |
416 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
417 | elfcpp::SHF_ALLOC, this->rel_); | |
418 | } | |
419 | ||
16649710 ILT |
420 | void |
421 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
422 | { | |
423 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
424 | // linker, and so do we. | |
425 | os->set_entsize(4); | |
426 | } | |
427 | ||
a3ad94ed ILT |
428 | // Add an entry to the PLT. |
429 | ||
430 | void | |
431 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
432 | { | |
433 | gold_assert(!gsym->has_plt_offset()); | |
434 | ||
435 | // Note that when setting the PLT offset we skip the initial | |
436 | // reserved PLT entry. | |
437 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
438 | ||
439 | ++this->count_; | |
440 | ||
441 | off_t got_offset = this->got_plt_->data_size(); | |
442 | ||
443 | // Every PLT entry needs a GOT entry which points back to the PLT | |
444 | // entry (this will be changed by the dynamic linker, normally | |
445 | // lazily when the function is called). | |
446 | this->got_plt_->set_space_size(got_offset + 4); | |
447 | ||
448 | // Every PLT entry needs a reloc. | |
16649710 | 449 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
450 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
451 | got_offset); | |
452 | ||
453 | // Note that we don't need to save the symbol. The contents of the | |
454 | // PLT are independent of which symbols are used. The symbols only | |
455 | // appear in the relocations. | |
456 | } | |
457 | ||
458 | // The first entry in the PLT for an executable. | |
459 | ||
460 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
461 | { | |
462 | 0xff, 0x35, // pushl contents of memory address | |
463 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
464 | 0xff, 0x25, // jmp indirect | |
465 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
466 | 0, 0, 0, 0 // unused | |
467 | }; | |
468 | ||
469 | // The first entry in the PLT for a shared object. | |
470 | ||
471 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
472 | { | |
473 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
474 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
475 | 0, 0, 0, 0 // unused | |
476 | }; | |
477 | ||
478 | // Subsequent entries in the PLT for an executable. | |
479 | ||
480 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
481 | { | |
482 | 0xff, 0x25, // jmp indirect | |
483 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
484 | 0x68, // pushl immediate | |
485 | 0, 0, 0, 0, // replaced with offset into relocation table | |
486 | 0xe9, // jmp relative | |
487 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
488 | }; | |
489 | ||
490 | // Subsequent entries in the PLT for a shared object. | |
491 | ||
492 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
493 | { | |
494 | 0xff, 0xa3, // jmp *offset(%ebx) | |
495 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
496 | 0x68, // pushl immediate | |
497 | 0, 0, 0, 0, // replaced with offset into relocation table | |
498 | 0xe9, // jmp relative | |
499 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
500 | }; | |
501 | ||
502 | // Write out the PLT. This uses the hand-coded instructions above, | |
503 | // and adjusts them as needed. This is all specified by the i386 ELF | |
504 | // Processor Supplement. | |
505 | ||
506 | void | |
507 | Output_data_plt_i386::do_write(Output_file* of) | |
508 | { | |
509 | const off_t offset = this->offset(); | |
510 | const off_t oview_size = this->data_size(); | |
511 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
512 | ||
513 | const off_t got_file_offset = this->got_plt_->offset(); | |
514 | const off_t got_size = this->got_plt_->data_size(); | |
515 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
516 | got_size); | |
517 | ||
518 | unsigned char* pov = oview; | |
519 | ||
520 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
521 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
522 | ||
7e1edb90 | 523 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
524 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
525 | else | |
526 | { | |
527 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
528 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
529 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
530 | } | |
531 | pov += plt_entry_size; | |
532 | ||
533 | unsigned char* got_pov = got_view; | |
534 | ||
535 | memset(got_pov, 0, 12); | |
536 | got_pov += 12; | |
537 | ||
538 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
539 | ||
540 | unsigned int plt_offset = plt_entry_size; | |
541 | unsigned int plt_rel_offset = 0; | |
542 | unsigned int got_offset = 12; | |
543 | const unsigned int count = this->count_; | |
544 | for (unsigned int i = 0; | |
545 | i < count; | |
546 | ++i, | |
547 | pov += plt_entry_size, | |
548 | got_pov += 4, | |
549 | plt_offset += plt_entry_size, | |
550 | plt_rel_offset += rel_size, | |
551 | got_offset += 4) | |
552 | { | |
553 | // Set and adjust the PLT entry itself. | |
554 | ||
7e1edb90 | 555 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
556 | { |
557 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
558 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
559 | } | |
560 | else | |
561 | { | |
562 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
563 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
564 | (got_address | |
565 | + got_offset)); | |
566 | } | |
567 | ||
568 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
569 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
570 | - (plt_offset + plt_entry_size)); | |
571 | ||
572 | // Set the entry in the GOT. | |
573 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
574 | } | |
575 | ||
576 | gold_assert(pov - oview == oview_size); | |
577 | gold_assert(got_pov - got_view == got_size); | |
578 | ||
579 | of->write_output_view(offset, oview_size, oview); | |
580 | of->write_output_view(got_file_offset, got_size, got_view); | |
581 | } | |
582 | ||
583 | // Create a PLT entry for a global symbol. | |
584 | ||
585 | void | |
7e1edb90 | 586 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
587 | { |
588 | if (gsym->has_plt_offset()) | |
589 | return; | |
590 | ||
591 | if (this->plt_ == NULL) | |
592 | { | |
593 | // Create the GOT sections first. | |
7e1edb90 | 594 | this->got_section(symtab, layout); |
a3ad94ed | 595 | |
7e1edb90 | 596 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
597 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
598 | (elfcpp::SHF_ALLOC | |
599 | | elfcpp::SHF_EXECINSTR), | |
600 | this->plt_); | |
a3ad94ed ILT |
601 | } |
602 | ||
603 | this->plt_->add_entry(gsym); | |
604 | } | |
605 | ||
606 | // Handle a relocation against a non-function symbol defined in a | |
607 | // dynamic object. The traditional way to handle this is to generate | |
608 | // a COPY relocation to copy the variable at runtime from the shared | |
609 | // object into the executable's data segment. However, this is | |
610 | // undesirable in general, as if the size of the object changes in the | |
611 | // dynamic object, the executable will no longer work correctly. If | |
612 | // this relocation is in a writable section, then we can create a | |
613 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
614 | // address at runtime. However, we do not want do that if the | |
615 | // relocation is in a read-only section, as it would prevent the | |
616 | // readonly segment from being shared. And if we have to eventually | |
617 | // generate a COPY reloc, then any dynamic relocations will be | |
618 | // useless. So this means that if this is a writable section, we need | |
619 | // to save the relocation until we see whether we have to create a | |
620 | // COPY relocation for this symbol for any other relocation. | |
621 | ||
622 | void | |
623 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
624 | Symbol_table* symtab, |
625 | Layout* layout, | |
a3ad94ed ILT |
626 | Sized_relobj<32, false>* object, |
627 | unsigned int data_shndx, Symbol* gsym, | |
5a6f7e2d | 628 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 629 | { |
5a6f7e2d ILT |
630 | Sized_symbol<32>* ssym; |
631 | ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym | |
632 | SELECT_SIZE(32)); | |
633 | ||
634 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
635 | data_shndx, ssym)) | |
a3ad94ed ILT |
636 | { |
637 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
638 | // If it turns out that we never need a COPY reloc for this |
639 | // symbol, then we will emit the relocation. | |
640 | if (this->copy_relocs_ == NULL) | |
641 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
642 | this->copy_relocs_->save(ssym, object, data_shndx, rel); | |
a3ad94ed | 643 | } |
5a6f7e2d ILT |
644 | else |
645 | { | |
646 | // Allocate space for this symbol in the .bss section. | |
647 | ||
648 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
649 | ||
650 | // There is no defined way to determine the required alignment | |
651 | // of the symbol. We pick the alignment based on the size. We | |
652 | // set an arbitrary maximum of 256. | |
653 | unsigned int align; | |
654 | for (align = 1; align < 512; align <<= 1) | |
655 | if ((symsize & align) != 0) | |
656 | break; | |
a3ad94ed | 657 | |
5a6f7e2d ILT |
658 | if (this->dynbss_ == NULL) |
659 | { | |
660 | this->dynbss_ = new Output_data_space(align); | |
661 | layout->add_output_section_data(".bss", | |
662 | elfcpp::SHT_NOBITS, | |
663 | (elfcpp::SHF_ALLOC | |
664 | | elfcpp::SHF_WRITE), | |
665 | this->dynbss_); | |
666 | } | |
667 | ||
668 | Output_data_space* dynbss = this->dynbss_; | |
669 | ||
670 | if (align > dynbss->addralign()) | |
671 | dynbss->set_space_alignment(align); | |
672 | ||
673 | off_t dynbss_size = dynbss->data_size(); | |
674 | dynbss_size = align_address(dynbss_size, align); | |
675 | off_t offset = dynbss_size; | |
676 | dynbss->set_space_size(dynbss_size + symsize); | |
677 | ||
46fe1623 | 678 | symtab->define_with_copy_reloc(this, ssym, dynbss, offset); |
5a6f7e2d ILT |
679 | |
680 | // Add the COPY reloc. | |
681 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
682 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
683 | } | |
a3ad94ed ILT |
684 | } |
685 | ||
92e059d8 | 686 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
687 | // symbol. IS_FINAL is true if the final address of this symbol is |
688 | // known at link time. | |
92e059d8 | 689 | |
af6359d5 | 690 | tls::Tls_optimization |
7e1edb90 | 691 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
692 | { |
693 | // If we are generating a shared library, then we can't do anything | |
694 | // in the linker. | |
7e1edb90 | 695 | if (parameters->output_is_shared()) |
af6359d5 | 696 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
697 | |
698 | switch (r_type) | |
699 | { | |
700 | case elfcpp::R_386_TLS_GD: | |
701 | case elfcpp::R_386_TLS_GOTDESC: | |
702 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 703 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
704 | // access. Since we know that we are generating an executable, |
705 | // we can convert this to Initial-Exec. If we also know that | |
706 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 707 | if (is_final) |
af6359d5 ILT |
708 | return tls::TLSOPT_TO_LE; |
709 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
710 | |
711 | case elfcpp::R_386_TLS_LDM: | |
712 | // This is Local-Dynamic, which refers to a local symbol in the | |
713 | // dynamic TLS block. Since we know that we generating an | |
714 | // executable, we can switch to Local-Exec. | |
af6359d5 | 715 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
716 | |
717 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
718 | // Another type of Local-Dynamic relocation. |
719 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
720 | |
721 | case elfcpp::R_386_TLS_IE: | |
722 | case elfcpp::R_386_TLS_GOTIE: | |
723 | case elfcpp::R_386_TLS_IE_32: | |
724 | // These are Initial-Exec relocs which get the thread offset | |
725 | // from the GOT. If we know that we are linking against the | |
726 | // local symbol, we can switch to Local-Exec, which links the | |
727 | // thread offset into the instruction. | |
a3ad94ed | 728 | if (is_final) |
af6359d5 ILT |
729 | return tls::TLSOPT_TO_LE; |
730 | return tls::TLSOPT_NONE; | |
8462ae85 | 731 | |
92e059d8 ILT |
732 | case elfcpp::R_386_TLS_LE: |
733 | case elfcpp::R_386_TLS_LE_32: | |
734 | // When we already have Local-Exec, there is nothing further we | |
735 | // can do. | |
af6359d5 | 736 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
737 | |
738 | default: | |
a3ad94ed | 739 | gold_unreachable(); |
92e059d8 ILT |
740 | } |
741 | } | |
742 | ||
af6359d5 ILT |
743 | // Report an unsupported relocation against a local symbol. |
744 | ||
745 | void | |
746 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
747 | unsigned int r_type) | |
748 | { | |
75f2446e ILT |
749 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
750 | object->name().c_str(), r_type); | |
af6359d5 ILT |
751 | } |
752 | ||
92e059d8 ILT |
753 | // Scan a relocation for a local symbol. |
754 | ||
755 | inline void | |
7e1edb90 | 756 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
757 | Symbol_table* symtab, |
758 | Layout* layout, | |
759 | Target_i386* target, | |
f6ce93d6 | 760 | Sized_relobj<32, false>* object, |
1b64748b ILT |
761 | unsigned int data_shndx, |
762 | const elfcpp::Rel<32, false>& reloc, | |
a3ad94ed | 763 | unsigned int r_type, |
92e059d8 ILT |
764 | const elfcpp::Sym<32, false>&) |
765 | { | |
766 | switch (r_type) | |
767 | { | |
768 | case elfcpp::R_386_NONE: | |
769 | case elfcpp::R_386_GNU_VTINHERIT: | |
770 | case elfcpp::R_386_GNU_VTENTRY: | |
771 | break; | |
772 | ||
773 | case elfcpp::R_386_32: | |
774 | case elfcpp::R_386_16: | |
775 | case elfcpp::R_386_8: | |
436ca963 ILT |
776 | // If building a shared library (or a position-independent |
777 | // executable), we need to create a dynamic relocation for | |
778 | // this location. The relocation applied at link time will | |
779 | // apply the link-time value, so we flag the location with | |
780 | // an R_386_RELATIVE relocation so the dynamic loader can | |
781 | // relocate it easily. | |
782 | if (parameters->output_is_position_independent()) | |
783 | { | |
784 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
86849f1f ILT |
785 | if (r_type == elfcpp::R_386_32) |
786 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx, | |
787 | reloc.get_r_offset()); | |
788 | else | |
789 | { | |
790 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
791 | rel_dyn->add_local(object, r_sym, r_type, data_shndx, | |
792 | reloc.get_r_offset()); | |
793 | } | |
436ca963 | 794 | } |
92e059d8 ILT |
795 | break; |
796 | ||
797 | case elfcpp::R_386_PC32: | |
798 | case elfcpp::R_386_PC16: | |
799 | case elfcpp::R_386_PC8: | |
800 | break; | |
801 | ||
df2efe71 ILT |
802 | case elfcpp::R_386_PLT32: |
803 | // Since we know this is a local symbol, we can handle this as a | |
804 | // PC32 reloc. | |
805 | break; | |
806 | ||
ead1e424 ILT |
807 | case elfcpp::R_386_GOTOFF: |
808 | case elfcpp::R_386_GOTPC: | |
809 | // We need a GOT section. | |
7e1edb90 | 810 | target->got_section(symtab, layout); |
ead1e424 ILT |
811 | break; |
812 | ||
1b64748b ILT |
813 | case elfcpp::R_386_GOT32: |
814 | { | |
815 | // The symbol requires a GOT entry. | |
816 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
817 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
818 | if (got->add_local(object, r_sym)) | |
819 | { | |
820 | // If we are generating a shared object, we need to add a | |
821 | // dynamic RELATIVE relocation for this symbol. | |
436ca963 | 822 | if (parameters->output_is_position_independent()) |
1b64748b ILT |
823 | { |
824 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
825 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, | |
826 | data_shndx, reloc.get_r_offset()); | |
827 | } | |
828 | } | |
829 | } | |
830 | break; | |
831 | ||
af6359d5 ILT |
832 | // These are relocations which should only be seen by the |
833 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
834 | case elfcpp::R_386_COPY: |
835 | case elfcpp::R_386_GLOB_DAT: | |
836 | case elfcpp::R_386_JUMP_SLOT: | |
837 | case elfcpp::R_386_RELATIVE: | |
838 | case elfcpp::R_386_TLS_TPOFF: | |
839 | case elfcpp::R_386_TLS_DTPMOD32: | |
840 | case elfcpp::R_386_TLS_DTPOFF32: | |
841 | case elfcpp::R_386_TLS_TPOFF32: | |
842 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 843 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 844 | object->name().c_str(), r_type); |
92e059d8 ILT |
845 | break; |
846 | ||
af6359d5 | 847 | // These are initial TLS relocs, which are expected when |
d61c17ea | 848 | // linking. |
56622147 ILT |
849 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
850 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
851 | case elfcpp::R_386_TLS_DESC_CALL: | |
852 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
853 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
854 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 855 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
856 | case elfcpp::R_386_TLS_GOTIE: |
857 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 858 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 859 | { |
80576242 | 860 | bool output_is_shared = parameters->output_is_shared(); |
af6359d5 ILT |
861 | const tls::Tls_optimization optimized_type |
862 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
863 | switch (r_type) |
864 | { | |
56622147 ILT |
865 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
866 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) | |
867 | case elfcpp::R_386_TLS_DESC_CALL: | |
868 | // FIXME: If not relaxing to LE, we need to generate | |
869 | // DTPMOD32 and DTPOFF32 relocs. | |
af6359d5 ILT |
870 | if (optimized_type != tls::TLSOPT_TO_LE) |
871 | unsupported_reloc_local(object, r_type); | |
872 | break; | |
873 | ||
56622147 | 874 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
af6359d5 ILT |
875 | // FIXME: If not relaxing to LE, we need to generate a |
876 | // DTPMOD32 reloc. | |
877 | if (optimized_type != tls::TLSOPT_TO_LE) | |
878 | unsupported_reloc_local(object, r_type); | |
879 | break; | |
880 | ||
56622147 | 881 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
882 | break; |
883 | ||
56622147 ILT |
884 | case elfcpp::R_386_TLS_IE: // Initial-exec |
885 | case elfcpp::R_386_TLS_IE_32: | |
886 | case elfcpp::R_386_TLS_GOTIE: | |
887 | // FIXME: If not relaxing to LE, we need to generate a | |
888 | // TPOFF or TPOFF32 reloc. | |
af6359d5 ILT |
889 | if (optimized_type != tls::TLSOPT_TO_LE) |
890 | unsupported_reloc_local(object, r_type); | |
7e1edb90 | 891 | break; |
af6359d5 | 892 | |
56622147 ILT |
893 | case elfcpp::R_386_TLS_LE: // Local-exec |
894 | case elfcpp::R_386_TLS_LE_32: | |
895 | // FIXME: If generating a shared object, we need to copy | |
896 | // this relocation into the object. | |
897 | gold_assert(!output_is_shared); | |
898 | break; | |
899 | ||
af6359d5 ILT |
900 | default: |
901 | gold_unreachable(); | |
7e1edb90 ILT |
902 | } |
903 | } | |
92e059d8 ILT |
904 | break; |
905 | ||
92e059d8 ILT |
906 | case elfcpp::R_386_32PLT: |
907 | case elfcpp::R_386_TLS_GD_32: | |
908 | case elfcpp::R_386_TLS_GD_PUSH: | |
909 | case elfcpp::R_386_TLS_GD_CALL: | |
910 | case elfcpp::R_386_TLS_GD_POP: | |
911 | case elfcpp::R_386_TLS_LDM_32: | |
912 | case elfcpp::R_386_TLS_LDM_PUSH: | |
913 | case elfcpp::R_386_TLS_LDM_CALL: | |
914 | case elfcpp::R_386_TLS_LDM_POP: | |
915 | case elfcpp::R_386_USED_BY_INTEL_200: | |
916 | default: | |
af6359d5 | 917 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
918 | break; |
919 | } | |
920 | } | |
921 | ||
af6359d5 ILT |
922 | // Report an unsupported relocation against a global symbol. |
923 | ||
924 | void | |
925 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
926 | unsigned int r_type, | |
927 | Symbol* gsym) | |
928 | { | |
75f2446e ILT |
929 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
930 | object->name().c_str(), r_type, gsym->name()); | |
af6359d5 ILT |
931 | } |
932 | ||
92e059d8 ILT |
933 | // Scan a relocation for a global symbol. |
934 | ||
935 | inline void | |
936 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
937 | Symbol_table* symtab, |
938 | Layout* layout, | |
939 | Target_i386* target, | |
f6ce93d6 | 940 | Sized_relobj<32, false>* object, |
a3ad94ed ILT |
941 | unsigned int data_shndx, |
942 | const elfcpp::Rel<32, false>& reloc, | |
943 | unsigned int r_type, | |
92e059d8 ILT |
944 | Symbol* gsym) |
945 | { | |
946 | switch (r_type) | |
947 | { | |
948 | case elfcpp::R_386_NONE: | |
949 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 950 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
951 | break; |
952 | ||
953 | case elfcpp::R_386_32: | |
954 | case elfcpp::R_386_PC32: | |
955 | case elfcpp::R_386_16: | |
956 | case elfcpp::R_386_PC16: | |
957 | case elfcpp::R_386_8: | |
958 | case elfcpp::R_386_PC8: | |
96f2030e ILT |
959 | { |
960 | bool is_pcrel = (r_type == elfcpp::R_386_PC32 | |
961 | || r_type == elfcpp::R_386_PC16 | |
962 | || r_type == elfcpp::R_386_PC8); | |
a3ad94ed | 963 | |
96f2030e ILT |
964 | if (gsym->is_from_dynobj() |
965 | || (parameters->output_is_shared() | |
966 | && gsym->is_preemptible())) | |
967 | { | |
968 | // (a) This symbol is defined in a dynamic object. If it is a | |
969 | // function, we make a PLT entry. Otherwise we need to | |
970 | // either generate a COPY reloc or copy this reloc. | |
971 | // (b) We are building a shared object and this symbol is | |
972 | // preemptible. If it is a function, we make a PLT entry. | |
973 | // Otherwise, we copy the reloc. | |
974 | if (gsym->type() == elfcpp::STT_FUNC) | |
975 | { | |
976 | target->make_plt_entry(symtab, layout, gsym); | |
977 | ||
978 | // If this is not a PC relative reference, then we may | |
979 | // be taking the address of the function. In that case | |
980 | // we need to set the entry in the dynamic symbol table | |
981 | // to the address of the PLT entry. We will also need to | |
982 | // create a dynamic relocation. | |
983 | if (!is_pcrel) | |
984 | { | |
985 | if (gsym->is_from_dynobj()) | |
986 | gsym->set_needs_dynsym_value(); | |
987 | if (parameters->output_is_position_independent()) | |
988 | { | |
96f2030e ILT |
989 | Reloc_section* rel_dyn = |
990 | target->rel_dyn_section(layout); | |
86849f1f ILT |
991 | rel_dyn->add_global(gsym, r_type, object, data_shndx, |
992 | reloc.get_r_offset()); | |
96f2030e ILT |
993 | } |
994 | } | |
995 | } | |
996 | else if (parameters->output_is_shared()) | |
997 | { | |
998 | // We do not make COPY relocs in shared objects. | |
999 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1000 | rel_dyn->add_global(gsym, r_type, object, data_shndx, | |
1001 | reloc.get_r_offset()); | |
1002 | } | |
1003 | else | |
1004 | target->copy_reloc(&options, symtab, layout, object, data_shndx, | |
1005 | gsym, reloc); | |
1006 | } | |
1007 | else if (!is_pcrel && parameters->output_is_position_independent()) | |
1008 | { | |
96f2030e | 1009 | // This is not a PC-relative reference, so we need to generate |
86849f1f ILT |
1010 | // a dynamic relocation. At this point, we know the symbol |
1011 | // is not preemptible, so we can use the RELATIVE relocation. | |
96f2030e | 1012 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
86849f1f ILT |
1013 | if (r_type == elfcpp::R_386_32) |
1014 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx, | |
1015 | reloc.get_r_offset()); | |
1016 | else | |
1017 | rel_dyn->add_global(gsym, r_type, object, data_shndx, | |
1018 | reloc.get_r_offset()); | |
96f2030e ILT |
1019 | } |
1020 | } | |
92e059d8 ILT |
1021 | break; |
1022 | ||
ead1e424 | 1023 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1024 | { |
1025 | // The symbol requires a GOT entry. | |
7e1edb90 | 1026 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
8462ae85 ILT |
1027 | if (got->add_global(gsym)) |
1028 | { | |
1029 | // If this symbol is not fully resolved, we need to add a | |
1030 | // dynamic relocation for it. | |
7e1edb90 | 1031 | if (!gsym->final_value_is_known()) |
8462ae85 ILT |
1032 | { |
1033 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1034 | rel_dyn->add_global(gsym, elfcpp::R_386_GLOB_DAT, got, | |
1035 | gsym->got_offset()); | |
1036 | } | |
1037 | } | |
1038 | } | |
ead1e424 ILT |
1039 | break; |
1040 | ||
1041 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1042 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1043 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1044 | if (gsym->final_value_is_known()) |
ead1e424 | 1045 | break; |
436ca963 ILT |
1046 | // If building a shared library, we can also skip the PLT entry |
1047 | // if the symbol is defined in the output file and is protected | |
1048 | // or hidden. | |
1049 | if (gsym->is_defined() | |
1050 | && !gsym->is_from_dynobj() | |
1051 | && !gsym->is_preemptible()) | |
1052 | break; | |
7e1edb90 | 1053 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1054 | break; |
1055 | ||
1056 | case elfcpp::R_386_GOTOFF: | |
1057 | case elfcpp::R_386_GOTPC: | |
1058 | // We need a GOT section. | |
7e1edb90 | 1059 | target->got_section(symtab, layout); |
ead1e424 ILT |
1060 | break; |
1061 | ||
af6359d5 ILT |
1062 | // These are relocations which should only be seen by the |
1063 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1064 | case elfcpp::R_386_COPY: |
1065 | case elfcpp::R_386_GLOB_DAT: | |
1066 | case elfcpp::R_386_JUMP_SLOT: | |
1067 | case elfcpp::R_386_RELATIVE: | |
1068 | case elfcpp::R_386_TLS_TPOFF: | |
1069 | case elfcpp::R_386_TLS_DTPMOD32: | |
1070 | case elfcpp::R_386_TLS_DTPOFF32: | |
1071 | case elfcpp::R_386_TLS_TPOFF32: | |
1072 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1073 | gold_error(_("%s: unexpected reloc %u in object file"), |
1074 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1075 | break; |
1076 | ||
d61c17ea ILT |
1077 | // These are initial tls relocs, which are expected when |
1078 | // linking. | |
56622147 ILT |
1079 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1080 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1081 | case elfcpp::R_386_TLS_DESC_CALL: | |
1082 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1083 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1084 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1085 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1086 | case elfcpp::R_386_TLS_GOTIE: |
1087 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1088 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1089 | { |
7e1edb90 | 1090 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1091 | const tls::Tls_optimization optimized_type |
1092 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1093 | switch (r_type) |
1094 | { | |
56622147 ILT |
1095 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1096 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) | |
1097 | case elfcpp::R_386_TLS_DESC_CALL: | |
1098 | // FIXME: If not relaxing to LE, we need to generate | |
1099 | // DTPMOD32 and DTPOFF32 relocs. | |
af6359d5 ILT |
1100 | if (optimized_type != tls::TLSOPT_TO_LE) |
1101 | unsupported_reloc_global(object, r_type, gsym); | |
1102 | break; | |
1103 | ||
56622147 | 1104 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
af6359d5 ILT |
1105 | // FIXME: If not relaxing to LE, we need to generate a |
1106 | // DTPMOD32 reloc. | |
1107 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1108 | unsupported_reloc_global(object, r_type, gsym); | |
1109 | break; | |
1110 | ||
56622147 | 1111 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1112 | break; |
1113 | ||
56622147 ILT |
1114 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1115 | case elfcpp::R_386_TLS_IE_32: | |
1116 | case elfcpp::R_386_TLS_GOTIE: | |
1117 | // FIXME: If not relaxing to LE, we need to generate a | |
1118 | // TPOFF or TPOFF32 reloc. | |
af6359d5 ILT |
1119 | if (optimized_type != tls::TLSOPT_TO_LE) |
1120 | unsupported_reloc_global(object, r_type, gsym); | |
a3ad94ed | 1121 | break; |
af6359d5 | 1122 | |
56622147 ILT |
1123 | case elfcpp::R_386_TLS_LE: // Local-exec |
1124 | case elfcpp::R_386_TLS_LE_32: | |
1125 | // FIXME: If generating a shared object, we need to copy | |
1126 | // this relocation into the object. | |
1127 | gold_assert(!parameters->output_is_shared()); | |
1128 | break; | |
1129 | ||
af6359d5 ILT |
1130 | default: |
1131 | gold_unreachable(); | |
a3ad94ed ILT |
1132 | } |
1133 | } | |
92e059d8 ILT |
1134 | break; |
1135 | ||
92e059d8 ILT |
1136 | case elfcpp::R_386_32PLT: |
1137 | case elfcpp::R_386_TLS_GD_32: | |
1138 | case elfcpp::R_386_TLS_GD_PUSH: | |
1139 | case elfcpp::R_386_TLS_GD_CALL: | |
1140 | case elfcpp::R_386_TLS_GD_POP: | |
1141 | case elfcpp::R_386_TLS_LDM_32: | |
1142 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1143 | case elfcpp::R_386_TLS_LDM_CALL: | |
1144 | case elfcpp::R_386_TLS_LDM_POP: | |
1145 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1146 | default: | |
af6359d5 | 1147 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1148 | break; |
1149 | } | |
1150 | } | |
1151 | ||
1152 | // Scan relocations for a section. | |
1153 | ||
1154 | void | |
1155 | Target_i386::scan_relocs(const General_options& options, | |
1156 | Symbol_table* symtab, | |
ead1e424 | 1157 | Layout* layout, |
f6ce93d6 | 1158 | Sized_relobj<32, false>* object, |
a3ad94ed | 1159 | unsigned int data_shndx, |
92e059d8 ILT |
1160 | unsigned int sh_type, |
1161 | const unsigned char* prelocs, | |
1162 | size_t reloc_count, | |
730cdc88 ILT |
1163 | Output_section* output_section, |
1164 | bool needs_special_offset_handling, | |
92e059d8 | 1165 | size_t local_symbol_count, |
730cdc88 | 1166 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1167 | { |
1168 | if (sh_type == elfcpp::SHT_RELA) | |
1169 | { | |
75f2446e ILT |
1170 | gold_error(_("%s: unsupported RELA reloc section"), |
1171 | object->name().c_str()); | |
1172 | return; | |
92e059d8 ILT |
1173 | } |
1174 | ||
ead1e424 ILT |
1175 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1176 | Target_i386::Scan>( | |
92e059d8 ILT |
1177 | options, |
1178 | symtab, | |
ead1e424 ILT |
1179 | layout, |
1180 | this, | |
92e059d8 | 1181 | object, |
a3ad94ed | 1182 | data_shndx, |
92e059d8 ILT |
1183 | prelocs, |
1184 | reloc_count, | |
730cdc88 ILT |
1185 | output_section, |
1186 | needs_special_offset_handling, | |
92e059d8 | 1187 | local_symbol_count, |
730cdc88 | 1188 | plocal_symbols); |
92e059d8 ILT |
1189 | } |
1190 | ||
16649710 | 1191 | // Finalize the sections. |
5a6f7e2d ILT |
1192 | |
1193 | void | |
7e1edb90 | 1194 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1195 | { |
16649710 ILT |
1196 | // Fill in some more dynamic tags. |
1197 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1198 | if (odyn != NULL) | |
1199 | { | |
1200 | if (this->got_plt_ != NULL) | |
1201 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1202 | ||
1203 | if (this->plt_ != NULL) | |
1204 | { | |
1205 | const Output_data* od = this->plt_->rel_plt(); | |
1206 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1207 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1208 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1209 | } | |
1210 | ||
1211 | if (this->rel_dyn_ != NULL) | |
1212 | { | |
1213 | const Output_data* od = this->rel_dyn_; | |
1214 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1215 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1216 | odyn->add_constant(elfcpp::DT_RELENT, | |
1217 | elfcpp::Elf_sizes<32>::rel_size); | |
1218 | } | |
1219 | ||
7e1edb90 | 1220 | if (!parameters->output_is_shared()) |
16649710 ILT |
1221 | { |
1222 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1223 | // linker at run time, and used by the debugger. | |
1224 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1229 | // relocs. | |
5a6f7e2d ILT |
1230 | if (this->copy_relocs_ == NULL) |
1231 | return; | |
1232 | if (this->copy_relocs_->any_to_emit()) | |
1233 | { | |
1234 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1235 | this->copy_relocs_->emit(rel_dyn); | |
1236 | } | |
1237 | delete this->copy_relocs_; | |
1238 | this->copy_relocs_ = NULL; | |
1239 | } | |
1240 | ||
86849f1f ILT |
1241 | // Return whether a direct absolute static relocation needs to be applied. |
1242 | // In cases where Scan::local() or Scan::global() has created | |
1243 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1244 | // of the relocation is carried in the data, and we must not | |
1245 | // apply the static relocation. | |
1246 | ||
1247 | inline bool | |
1248 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
1249 | bool is_pcrel, | |
1250 | bool is_32bit) | |
1251 | { | |
1252 | // For local symbols, return FALSE if a non-RELATIVE dynamic | |
1253 | // relocation was created; return TRUE otherwise. | |
1254 | if (gsym == NULL) | |
1255 | return (!parameters->output_is_position_independent() || is_32bit); | |
1256 | ||
1257 | // For global symbols, mimic the logic in Scan::global() | |
1258 | // to decide whether a non-RELATIVE dynamic relocation was | |
1259 | // created. | |
1260 | // FIXME: This is ugly. Try to refactor this logic so it can be | |
1261 | // shared by Scan::global() and Relocate::relocate(). | |
1262 | if (gsym->is_from_dynobj() | |
1263 | || (parameters->output_is_shared() | |
1264 | && gsym->is_preemptible())) | |
1265 | { | |
1266 | if (gsym->type() == elfcpp::STT_FUNC) | |
1267 | { | |
1268 | if (!is_pcrel && parameters->output_is_position_independent()) | |
1269 | return false; | |
1270 | } | |
1271 | else | |
1272 | return false; | |
1273 | } | |
1274 | else if (!is_pcrel && parameters->output_is_position_independent()) | |
1275 | return is_32bit; | |
1276 | ||
1277 | // For all other cases, return TRUE | |
1278 | return true; | |
1279 | } | |
1280 | ||
61ba1cf9 ILT |
1281 | // Perform a relocation. |
1282 | ||
ead1e424 | 1283 | inline bool |
92e059d8 | 1284 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1285 | Target_i386* target, |
92e059d8 ILT |
1286 | size_t relnum, |
1287 | const elfcpp::Rel<32, false>& rel, | |
1288 | unsigned int r_type, | |
c06b7b0b | 1289 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1290 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1291 | unsigned char* view, |
1292 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1293 | off_t view_size) | |
61ba1cf9 | 1294 | { |
ead1e424 ILT |
1295 | if (this->skip_call_tls_get_addr_) |
1296 | { | |
1297 | if (r_type != elfcpp::R_386_PLT32 | |
1298 | || gsym == NULL | |
1299 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1300 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1301 | _("missing expected TLS relocation")); | |
1302 | else | |
ead1e424 | 1303 | { |
75f2446e ILT |
1304 | this->skip_call_tls_get_addr_ = false; |
1305 | return false; | |
ead1e424 | 1306 | } |
ead1e424 ILT |
1307 | } |
1308 | ||
a3ad94ed | 1309 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1310 | Symbol_value<32> symval; |
436ca963 ILT |
1311 | if (gsym != NULL |
1312 | && (gsym->is_from_dynobj() | |
1313 | || (parameters->output_is_shared() | |
1314 | && gsym->is_preemptible())) | |
1315 | && gsym->has_plt_offset()) | |
a3ad94ed | 1316 | { |
b8e6aad9 ILT |
1317 | symval.set_output_value(target->plt_section()->address() |
1318 | + gsym->plt_offset()); | |
1319 | psymval = &symval; | |
a3ad94ed ILT |
1320 | } |
1321 | ||
b8e6aad9 ILT |
1322 | const Sized_relobj<32, false>* object = relinfo->object; |
1323 | ||
1b64748b | 1324 | // Get the GOT offset if needed. |
96f2030e ILT |
1325 | // The GOT pointer points to the end of the GOT section. |
1326 | // We need to subtract the size of the GOT section to get | |
1327 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1328 | bool have_got_offset = false; |
1329 | unsigned int got_offset = 0; | |
1330 | switch (r_type) | |
1331 | { | |
1332 | case elfcpp::R_386_GOT32: | |
1333 | if (gsym != NULL) | |
1334 | { | |
1335 | gold_assert(gsym->has_got_offset()); | |
96f2030e | 1336 | got_offset = gsym->got_offset() - target->got_size(); |
1b64748b ILT |
1337 | } |
1338 | else | |
1339 | { | |
1340 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
96f2030e | 1341 | got_offset = object->local_got_offset(r_sym) - target->got_size(); |
1b64748b ILT |
1342 | } |
1343 | have_got_offset = true; | |
1344 | break; | |
1345 | ||
1346 | default: | |
1347 | break; | |
1348 | } | |
1349 | ||
61ba1cf9 ILT |
1350 | switch (r_type) |
1351 | { | |
1352 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1353 | case elfcpp::R_386_GNU_VTINHERIT: |
1354 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1355 | break; |
1356 | ||
1357 | case elfcpp::R_386_32: | |
86849f1f ILT |
1358 | if (should_apply_static_reloc(gsym, false, true)) |
1359 | Relocate_functions<32, false>::rel32(view, object, psymval); | |
61ba1cf9 ILT |
1360 | break; |
1361 | ||
1362 | case elfcpp::R_386_PC32: | |
86849f1f ILT |
1363 | if (should_apply_static_reloc(gsym, true, true)) |
1364 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
1365 | break; |
1366 | ||
1367 | case elfcpp::R_386_16: | |
86849f1f ILT |
1368 | if (should_apply_static_reloc(gsym, false, false)) |
1369 | Relocate_functions<32, false>::rel16(view, object, psymval); | |
92e059d8 ILT |
1370 | break; |
1371 | ||
1372 | case elfcpp::R_386_PC16: | |
86849f1f ILT |
1373 | if (should_apply_static_reloc(gsym, true, false)) |
1374 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
1375 | break; |
1376 | ||
92e059d8 | 1377 | case elfcpp::R_386_8: |
86849f1f ILT |
1378 | if (should_apply_static_reloc(gsym, false, false)) |
1379 | Relocate_functions<32, false>::rel8(view, object, psymval); | |
92e059d8 ILT |
1380 | break; |
1381 | ||
1382 | case elfcpp::R_386_PC8: | |
86849f1f ILT |
1383 | if (should_apply_static_reloc(gsym, true, false)) |
1384 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
1385 | break; |
1386 | ||
ead1e424 | 1387 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1388 | gold_assert(gsym == NULL |
1389 | || gsym->has_plt_offset() | |
1390 | || gsym->final_value_is_known()); | |
b8e6aad9 | 1391 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1392 | break; |
1393 | ||
1394 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1395 | gold_assert(have_got_offset); |
1396 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1397 | break; |
1398 | ||
1399 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1400 | { |
1401 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1402 | value = (psymval->value(object, 0) | |
96f2030e | 1403 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1404 | Relocate_functions<32, false>::rel32(view, value); |
1405 | } | |
ead1e424 ILT |
1406 | break; |
1407 | ||
1408 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1409 | { |
1410 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1411 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1412 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1413 | } | |
ead1e424 ILT |
1414 | break; |
1415 | ||
92e059d8 ILT |
1416 | case elfcpp::R_386_COPY: |
1417 | case elfcpp::R_386_GLOB_DAT: | |
1418 | case elfcpp::R_386_JUMP_SLOT: | |
1419 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1420 | // These are outstanding tls relocs, which are unexpected when |
1421 | // linking. | |
92e059d8 ILT |
1422 | case elfcpp::R_386_TLS_TPOFF: |
1423 | case elfcpp::R_386_TLS_DTPMOD32: | |
1424 | case elfcpp::R_386_TLS_DTPOFF32: | |
1425 | case elfcpp::R_386_TLS_TPOFF32: | |
1426 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1427 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1428 | _("unexpected reloc %u in object file"), | |
1429 | r_type); | |
92e059d8 ILT |
1430 | break; |
1431 | ||
d61c17ea ILT |
1432 | // These are initial tls relocs, which are expected when |
1433 | // linking. | |
56622147 ILT |
1434 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1435 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1436 | case elfcpp::R_386_TLS_DESC_CALL: | |
1437 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1438 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1439 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1440 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1441 | case elfcpp::R_386_TLS_GOTIE: |
1442 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1443 | case elfcpp::R_386_TLS_LE_32: |
b8e6aad9 | 1444 | this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view, |
ead1e424 | 1445 | address, view_size); |
92e059d8 ILT |
1446 | break; |
1447 | ||
92e059d8 ILT |
1448 | case elfcpp::R_386_32PLT: |
1449 | case elfcpp::R_386_TLS_GD_32: | |
1450 | case elfcpp::R_386_TLS_GD_PUSH: | |
1451 | case elfcpp::R_386_TLS_GD_CALL: | |
1452 | case elfcpp::R_386_TLS_GD_POP: | |
1453 | case elfcpp::R_386_TLS_LDM_32: | |
1454 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1455 | case elfcpp::R_386_TLS_LDM_CALL: | |
1456 | case elfcpp::R_386_TLS_LDM_POP: | |
1457 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1458 | default: |
75f2446e ILT |
1459 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1460 | _("unsupported reloc %u"), | |
1461 | r_type); | |
92e059d8 ILT |
1462 | break; |
1463 | } | |
ead1e424 ILT |
1464 | |
1465 | return true; | |
92e059d8 ILT |
1466 | } |
1467 | ||
1468 | // Perform a TLS relocation. | |
1469 | ||
1470 | inline void | |
1471 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
1472 | size_t relnum, | |
1473 | const elfcpp::Rel<32, false>& rel, | |
1474 | unsigned int r_type, | |
c06b7b0b | 1475 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1476 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1477 | unsigned char* view, |
1478 | elfcpp::Elf_types<32>::Elf_Addr, | |
1479 | off_t view_size) | |
1480 | { | |
1481 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
1482 | if (tls_segment == NULL) | |
1483 | { | |
75f2446e ILT |
1484 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1485 | _("TLS reloc but no TLS segment")); | |
1486 | return; | |
92e059d8 ILT |
1487 | } |
1488 | ||
b8e6aad9 ILT |
1489 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(relinfo->object, 0); |
1490 | ||
a3ad94ed | 1491 | const bool is_final = (gsym == NULL |
436ca963 | 1492 | ? !parameters->output_is_position_independent() |
7e1edb90 | 1493 | : gsym->final_value_is_known()); |
af6359d5 ILT |
1494 | const tls::Tls_optimization optimized_type |
1495 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1496 | switch (r_type) |
1497 | { | |
56622147 | 1498 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1499 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1500 | { |
56622147 ILT |
1501 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1502 | rel, r_type, value, view, | |
1503 | view_size); | |
92e059d8 ILT |
1504 | break; |
1505 | } | |
75f2446e ILT |
1506 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1507 | _("unsupported reloc %u"), | |
1508 | r_type); | |
92e059d8 ILT |
1509 | break; |
1510 | ||
56622147 ILT |
1511 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1512 | case elfcpp::R_386_TLS_DESC_CALL: | |
75f2446e ILT |
1513 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1514 | _("unsupported reloc %u"), | |
1515 | r_type); | |
ead1e424 ILT |
1516 | break; |
1517 | ||
56622147 | 1518 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1519 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1520 | { | |
75f2446e ILT |
1521 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1522 | _("both SUN and GNU model " | |
1523 | "TLS relocations")); | |
1524 | break; | |
46cf9fa2 ILT |
1525 | } |
1526 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1527 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 ILT |
1528 | { |
1529 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, | |
1530 | value, view, view_size); | |
1531 | break; | |
1532 | } | |
75f2446e ILT |
1533 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1534 | _("unsupported reloc %u"), | |
1535 | r_type); | |
46cf9fa2 ILT |
1536 | break; |
1537 | ||
56622147 | 1538 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1539 | // This reloc can appear in debugging sections, in which case we |
1540 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1541 | // tells us this. | |
af6359d5 | 1542 | if (optimized_type != tls::TLSOPT_TO_LE |
46cf9fa2 ILT |
1543 | || this->local_dynamic_type_ == LOCAL_DYNAMIC_NONE) |
1544 | value = value - tls_segment->vaddr(); | |
1545 | else if (this->local_dynamic_type_ == LOCAL_DYNAMIC_GNU) | |
1546 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1547 | else | |
1548 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1549 | Relocate_functions<32, false>::rel32(view, value); | |
1550 | break; | |
1551 | ||
56622147 ILT |
1552 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1553 | case elfcpp::R_386_TLS_GOTIE: | |
1554 | case elfcpp::R_386_TLS_IE_32: | |
1555 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1556 | { | |
1557 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, | |
1558 | rel, r_type, value, view, | |
1559 | view_size); | |
1560 | break; | |
1561 | } | |
75f2446e ILT |
1562 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1563 | _("unsupported reloc %u"), | |
1564 | r_type); | |
92e059d8 | 1565 | break; |
92e059d8 | 1566 | |
56622147 ILT |
1567 | case elfcpp::R_386_TLS_LE: // Local-exec |
1568 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1569 | Relocate_functions<32, false>::rel32(view, value); | |
1570 | break; | |
92e059d8 | 1571 | |
56622147 ILT |
1572 | case elfcpp::R_386_TLS_LE_32: |
1573 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1574 | Relocate_functions<32, false>::rel32(view, value); | |
1575 | break; | |
92e059d8 | 1576 | } |
92e059d8 ILT |
1577 | } |
1578 | ||
e041f13d | 1579 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1580 | // Local-Exec. |
1581 | ||
1582 | inline void | |
1583 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1584 | size_t relnum, | |
1585 | Output_segment* tls_segment, | |
1586 | const elfcpp::Rel<32, false>& rel, | |
1587 | unsigned int, | |
1588 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1589 | unsigned char* view, | |
1590 | off_t view_size) | |
1591 | { | |
1592 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 1593 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
1594 | // leal foo(%reg),%eax; call ___tls_get_addr |
1595 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
1596 | ||
af6359d5 ILT |
1597 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1598 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
1599 | |
1600 | unsigned char op1 = view[-1]; | |
1601 | unsigned char op2 = view[-2]; | |
1602 | ||
af6359d5 ILT |
1603 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1604 | op2 == 0x8d || op2 == 0x04); | |
1605 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
1606 | |
1607 | int roff = 5; | |
1608 | ||
1609 | if (op2 == 0x04) | |
1610 | { | |
af6359d5 ILT |
1611 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
1612 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1613 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1614 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
1615 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
1616 | } | |
1617 | else | |
1618 | { | |
af6359d5 ILT |
1619 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1620 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
d61c17ea ILT |
1621 | if (static_cast<off_t>(rel.get_r_offset() + 9) < view_size |
1622 | && view[9] == 0x90) | |
ead1e424 ILT |
1623 | { |
1624 | // There is a trailing nop. Use the size byte subl. | |
1625 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1626 | roff = 6; | |
1627 | } | |
1628 | else | |
1629 | { | |
1630 | // Use the five byte subl. | |
1631 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1636 | Relocate_functions<32, false>::rel32(view + roff, value); | |
1637 | ||
1638 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1639 | // We can skip it. | |
1640 | this->skip_call_tls_get_addr_ = true; | |
1641 | } | |
1642 | ||
46cf9fa2 ILT |
1643 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
1644 | // Local-Exec. | |
1645 | ||
1646 | inline void | |
1647 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
1648 | size_t relnum, | |
1649 | Output_segment*, | |
1650 | const elfcpp::Rel<32, false>& rel, | |
1651 | unsigned int, | |
1652 | elfcpp::Elf_types<32>::Elf_Addr, | |
1653 | unsigned char* view, | |
1654 | off_t view_size) | |
1655 | { | |
1656 | // leal foo(%reg), %eax; call ___tls_get_addr | |
1657 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
1658 | ||
af6359d5 ILT |
1659 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1660 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
1661 | |
1662 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
1663 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1664 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 1665 | |
af6359d5 | 1666 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
1667 | |
1668 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
1669 | ||
1670 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1671 | // We can skip it. | |
1672 | this->skip_call_tls_get_addr_ = true; | |
1673 | } | |
1674 | ||
56622147 ILT |
1675 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1676 | // Local-Exec. | |
1677 | ||
1678 | inline void | |
1679 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
1680 | size_t relnum, | |
1681 | Output_segment* tls_segment, | |
1682 | const elfcpp::Rel<32, false>& rel, | |
1683 | unsigned int r_type, | |
1684 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1685 | unsigned char* view, | |
1686 | off_t view_size) | |
1687 | { | |
1688 | // We have to actually change the instructions, which means that we | |
1689 | // need to examine the opcodes to figure out which instruction we | |
1690 | // are looking at. | |
1691 | if (r_type == elfcpp::R_386_TLS_IE) | |
1692 | { | |
1693 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
1694 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
1695 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
1696 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
1697 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
1698 | ||
1699 | unsigned char op1 = view[-1]; | |
1700 | if (op1 == 0xa1) | |
1701 | { | |
1702 | // movl XX,%eax ==> movl $YY,%eax | |
1703 | view[-1] = 0xb8; | |
1704 | } | |
1705 | else | |
1706 | { | |
1707 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
1708 | ||
1709 | unsigned char op2 = view[-2]; | |
1710 | if (op2 == 0x8b) | |
1711 | { | |
1712 | // movl XX,%reg ==> movl $YY,%reg | |
1713 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1714 | (op1 & 0xc7) == 0x05); | |
1715 | view[-2] = 0xc7; | |
1716 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1717 | } | |
1718 | else if (op2 == 0x03) | |
1719 | { | |
1720 | // addl XX,%reg ==> addl $YY,%reg | |
1721 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1722 | (op1 & 0xc7) == 0x05); | |
1723 | view[-2] = 0x81; | |
1724 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1725 | } | |
1726 | else | |
1727 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
1728 | } | |
1729 | } | |
1730 | else | |
1731 | { | |
1732 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
1733 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
1734 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
1735 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
1736 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
1737 | ||
1738 | unsigned char op1 = view[-1]; | |
1739 | unsigned char op2 = view[-2]; | |
1740 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1741 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
1742 | if (op2 == 0x8b) | |
1743 | { | |
1744 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
1745 | view[-2] = 0xc7; | |
1746 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1747 | } | |
1748 | else if (op2 == 0x2b) | |
1749 | { | |
1750 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
1751 | view[-2] = 0x81; | |
1752 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
1753 | } | |
1754 | else if (op2 == 0x03) | |
1755 | { | |
1756 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
1757 | view[-2] = 0x81; | |
1758 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1759 | } | |
1760 | else | |
1761 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
1762 | } | |
1763 | ||
1764 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1765 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) | |
1766 | value = - value; | |
1767 | ||
1768 | Relocate_functions<32, false>::rel32(view, value); | |
1769 | } | |
1770 | ||
61ba1cf9 ILT |
1771 | // Relocate section data. |
1772 | ||
1773 | void | |
92e059d8 | 1774 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
1775 | unsigned int sh_type, |
1776 | const unsigned char* prelocs, | |
1777 | size_t reloc_count, | |
730cdc88 ILT |
1778 | Output_section* output_section, |
1779 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
1780 | unsigned char* view, |
1781 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1782 | off_t view_size) | |
1783 | { | |
a3ad94ed | 1784 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 1785 | |
ead1e424 ILT |
1786 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
1787 | Target_i386::Relocate>( | |
92e059d8 | 1788 | relinfo, |
ead1e424 | 1789 | this, |
61ba1cf9 ILT |
1790 | prelocs, |
1791 | reloc_count, | |
730cdc88 ILT |
1792 | output_section, |
1793 | needs_special_offset_handling, | |
61ba1cf9 ILT |
1794 | view, |
1795 | address, | |
1796 | view_size); | |
1797 | } | |
1798 | ||
ab5c9e90 ILT |
1799 | // Return the value to use for a dynamic which requires special |
1800 | // treatment. This is how we support equality comparisons of function | |
1801 | // pointers across shared library boundaries, as described in the | |
1802 | // processor specific ABI supplement. | |
1803 | ||
1804 | uint64_t | |
1805 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
1806 | { | |
1807 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
1808 | return this->plt_section()->address() + gsym->plt_offset(); | |
1809 | } | |
1810 | ||
c51e6221 ILT |
1811 | // Return a string used to fill a code section with nops to take up |
1812 | // the specified length. | |
1813 | ||
1814 | std::string | |
1815 | Target_i386::do_code_fill(off_t length) | |
1816 | { | |
1817 | if (length >= 16) | |
1818 | { | |
1819 | // Build a jmp instruction to skip over the bytes. | |
1820 | unsigned char jmp[5]; | |
1821 | jmp[0] = 0xe9; | |
1822 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
1823 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
1824 | + std::string(length - 5, '\0')); | |
1825 | } | |
1826 | ||
1827 | // Nop sequences of various lengths. | |
1828 | const char nop1[1] = { 0x90 }; // nop | |
1829 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1830 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
1831 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
1832 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
1833 | 0x00 }; // leal 0(%esi,1),%esi | |
1834 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1835 | 0x00, 0x00 }; | |
1836 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1837 | 0x00, 0x00, 0x00 }; | |
1838 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
1839 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
1840 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
1841 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1842 | 0x00 }; | |
1843 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
1844 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1845 | 0x00, 0x00 }; | |
1846 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
1847 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
1848 | 0x00, 0x00, 0x00 }; | |
1849 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1850 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
1851 | 0x00, 0x00, 0x00, 0x00 }; | |
1852 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1853 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
1854 | 0x27, 0x00, 0x00, 0x00, | |
1855 | 0x00 }; | |
1856 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1857 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
1858 | 0xbc, 0x27, 0x00, 0x00, | |
1859 | 0x00, 0x00 }; | |
1860 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
1861 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
1862 | 0x90, 0x90, 0x90, 0x90, | |
1863 | 0x90, 0x90, 0x90 }; | |
1864 | ||
1865 | const char* nops[16] = { | |
1866 | NULL, | |
1867 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
1868 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
1869 | }; | |
1870 | ||
1871 | return std::string(nops[length], length); | |
1872 | } | |
1873 | ||
14bfc3f5 ILT |
1874 | // The selector for i386 object files. |
1875 | ||
1876 | class Target_selector_i386 : public Target_selector | |
1877 | { | |
1878 | public: | |
1879 | Target_selector_i386() | |
1880 | : Target_selector(elfcpp::EM_386, 32, false) | |
1881 | { } | |
1882 | ||
1883 | Target* | |
ead1e424 ILT |
1884 | recognize(int machine, int osabi, int abiversion); |
1885 | ||
1886 | private: | |
1887 | Target_i386* target_; | |
14bfc3f5 ILT |
1888 | }; |
1889 | ||
1890 | // Recognize an i386 object file when we already know that the machine | |
1891 | // number is EM_386. | |
1892 | ||
1893 | Target* | |
ead1e424 | 1894 | Target_selector_i386::recognize(int, int, int) |
14bfc3f5 | 1895 | { |
ead1e424 ILT |
1896 | if (this->target_ == NULL) |
1897 | this->target_ = new Target_i386(); | |
1898 | return this->target_; | |
14bfc3f5 ILT |
1899 | } |
1900 | ||
1901 | Target_selector_i386 target_selector_i386; | |
1902 | ||
1903 | } // End anonymous namespace. |