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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 | ||
9a2d6984 ILT |
103 | // Return whether SYM is defined by the ABI. |
104 | bool | |
105 | do_is_defined_by_abi(Symbol* sym) const | |
106 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } | |
107 | ||
96f2030e ILT |
108 | // Return the size of the GOT section. |
109 | off_t | |
110 | got_size() | |
111 | { | |
112 | gold_assert(this->got_ != NULL); | |
113 | return this->got_->data_size(); | |
114 | } | |
115 | ||
92e059d8 ILT |
116 | private: |
117 | // The class which scans relocations. | |
118 | struct Scan | |
61ba1cf9 ILT |
119 | { |
120 | inline void | |
ead1e424 ILT |
121 | local(const General_options& options, Symbol_table* symtab, |
122 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 123 | Sized_relobj<32, false>* object, |
a3ad94ed | 124 | unsigned int data_shndx, |
92e059d8 ILT |
125 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
126 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 127 | |
92e059d8 | 128 | inline void |
ead1e424 ILT |
129 | global(const General_options& options, Symbol_table* symtab, |
130 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 131 | Sized_relobj<32, false>* object, |
a3ad94ed | 132 | unsigned int data_shndx, |
92e059d8 ILT |
133 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
134 | Symbol* gsym); | |
af6359d5 ILT |
135 | |
136 | static void | |
137 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
138 | ||
139 | static void | |
140 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
141 | Symbol*); | |
61ba1cf9 ILT |
142 | }; |
143 | ||
92e059d8 ILT |
144 | // The class which implements relocation. |
145 | class Relocate | |
146 | { | |
147 | public: | |
ead1e424 | 148 | Relocate() |
46cf9fa2 ILT |
149 | : skip_call_tls_get_addr_(false), |
150 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
151 | { } |
152 | ||
153 | ~Relocate() | |
154 | { | |
155 | if (this->skip_call_tls_get_addr_) | |
156 | { | |
157 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 158 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
159 | } |
160 | } | |
161 | ||
86849f1f ILT |
162 | // Return whether the static relocation needs to be applied. |
163 | inline bool | |
164 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
d61c6bd4 ILT |
165 | bool is_absolute_ref, |
166 | bool is_function_call, | |
86849f1f ILT |
167 | bool is_32bit); |
168 | ||
ead1e424 ILT |
169 | // Do a relocation. Return false if the caller should not issue |
170 | // any warnings about this relocation. | |
171 | inline bool | |
172 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 173 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 174 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 175 | const Symbol_value<32>*, |
92e059d8 ILT |
176 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
177 | off_t); | |
178 | ||
179 | private: | |
180 | // Do a TLS relocation. | |
ead1e424 | 181 | inline void |
92e059d8 ILT |
182 | relocate_tls(const Relocate_info<32, false>*, size_t relnum, |
183 | const elfcpp::Rel<32, false>&, | |
c06b7b0b | 184 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 185 | const Symbol_value<32>*, |
92e059d8 ILT |
186 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, off_t); |
187 | ||
56622147 ILT |
188 | // Do a TLS General-Dynamic to Local-Exec transition. |
189 | inline void | |
190 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
191 | Output_segment* tls_segment, |
192 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
193 | elfcpp::Elf_types<32>::Elf_Addr value, | |
194 | unsigned char* view, | |
195 | off_t view_size); | |
196 | ||
56622147 | 197 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 198 | inline void |
56622147 | 199 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
200 | Output_segment* tls_segment, |
201 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
202 | elfcpp::Elf_types<32>::Elf_Addr value, | |
203 | unsigned char* view, | |
204 | off_t view_size); | |
205 | ||
56622147 ILT |
206 | // Do a TLS Initial-Exec to Local-Exec transition. |
207 | static inline void | |
208 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
209 | Output_segment* tls_segment, |
210 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
211 | elfcpp::Elf_types<32>::Elf_Addr value, | |
212 | unsigned char* view, | |
213 | off_t view_size); | |
214 | ||
46cf9fa2 ILT |
215 | // We need to keep track of which type of local dynamic relocation |
216 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
217 | enum Local_dynamic_type | |
218 | { | |
219 | LOCAL_DYNAMIC_NONE, | |
220 | LOCAL_DYNAMIC_SUN, | |
221 | LOCAL_DYNAMIC_GNU | |
222 | }; | |
223 | ||
ead1e424 ILT |
224 | // This is set if we should skip the next reloc, which should be a |
225 | // PLT32 reloc against ___tls_get_addr. | |
226 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
227 | // The type of local dynamic relocation we have seen in the section |
228 | // being relocated, if any. | |
229 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
230 | }; |
231 | ||
232 | // Adjust TLS relocation type based on the options and whether this | |
233 | // is a local symbol. | |
af6359d5 | 234 | static tls::Tls_optimization |
7e1edb90 | 235 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 236 | |
ead1e424 | 237 | // Get the GOT section, creating it if necessary. |
dbe717ef | 238 | Output_data_got<32, false>* |
7e1edb90 | 239 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 240 | |
96f2030e ILT |
241 | // Get the GOT PLT section. |
242 | Output_data_space* | |
243 | got_plt_section() const | |
244 | { | |
245 | gold_assert(this->got_plt_ != NULL); | |
246 | return this->got_plt_; | |
247 | } | |
248 | ||
a3ad94ed ILT |
249 | // Create a PLT entry for a global symbol. |
250 | void | |
7e1edb90 | 251 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed ILT |
252 | |
253 | // Get the PLT section. | |
7bb3655e | 254 | const Output_data_plt_i386* |
a3ad94ed ILT |
255 | plt_section() const |
256 | { | |
257 | gold_assert(this->plt_ != NULL); | |
258 | return this->plt_; | |
259 | } | |
260 | ||
5a6f7e2d ILT |
261 | // Get the dynamic reloc section, creating it if necessary. |
262 | Reloc_section* | |
263 | rel_dyn_section(Layout*); | |
264 | ||
d61c6bd4 ILT |
265 | // Return true if the symbol may need a COPY relocation. |
266 | // References from an executable object to non-function symbols | |
267 | // defined in a dynamic object may need a COPY relocation. | |
268 | bool | |
269 | may_need_copy_reloc(Symbol* gsym) | |
270 | { | |
271 | return (!parameters->output_is_shared() | |
272 | && gsym->is_from_dynobj() | |
273 | && gsym->type() != elfcpp::STT_FUNC); | |
274 | } | |
275 | ||
a3ad94ed ILT |
276 | // Copy a relocation against a global symbol. |
277 | void | |
5a6f7e2d ILT |
278 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
279 | Sized_relobj<32, false>*, unsigned int, | |
a3ad94ed | 280 | Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 281 | |
92e059d8 ILT |
282 | // Information about this specific target which we pass to the |
283 | // general Target structure. | |
75f65a3e | 284 | static const Target::Target_info i386_info; |
ead1e424 ILT |
285 | |
286 | // The GOT section. | |
dbe717ef | 287 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
288 | // The PLT section. |
289 | Output_data_plt_i386* plt_; | |
290 | // The GOT PLT section. | |
291 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
292 | // The dynamic reloc section. |
293 | Reloc_section* rel_dyn_; | |
294 | // Relocs saved to avoid a COPY reloc. | |
295 | Copy_relocs<32, false>* copy_relocs_; | |
296 | // Space for variables copied with a COPY reloc. | |
297 | Output_data_space* dynbss_; | |
75f65a3e ILT |
298 | }; |
299 | ||
300 | const Target::Target_info Target_i386::i386_info = | |
301 | { | |
61ba1cf9 ILT |
302 | 32, // size |
303 | false, // is_big_endian | |
304 | elfcpp::EM_386, // machine_code | |
305 | false, // has_make_symbol | |
dbe717ef | 306 | false, // has_resolve |
c51e6221 | 307 | true, // has_code_fill |
35cdfc9a | 308 | true, // is_default_stack_executable |
dbe717ef | 309 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 310 | 0x08048000, // default_text_segment_address |
61ba1cf9 ILT |
311 | 0x1000, // abi_pagesize |
312 | 0x1000 // common_pagesize | |
14bfc3f5 ILT |
313 | }; |
314 | ||
ead1e424 ILT |
315 | // Get the GOT section, creating it if necessary. |
316 | ||
dbe717ef | 317 | Output_data_got<32, false>* |
7e1edb90 | 318 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
319 | { |
320 | if (this->got_ == NULL) | |
321 | { | |
7e1edb90 | 322 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 323 | |
7e1edb90 | 324 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 325 | |
ead1e424 | 326 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
327 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
328 | this->got_); | |
ead1e424 | 329 | |
a3ad94ed ILT |
330 | // The old GNU linker creates a .got.plt section. We just |
331 | // create another set of data in the .got section. Note that we | |
332 | // always create a PLT if we create a GOT, although the PLT | |
333 | // might be empty. | |
334 | this->got_plt_ = new Output_data_space(4); | |
335 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
336 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
337 | this->got_plt_); | |
a3ad94ed | 338 | |
ead1e424 | 339 | // The first three entries are reserved. |
a3ad94ed | 340 | this->got_plt_->set_space_size(3 * 4); |
ead1e424 | 341 | |
a3ad94ed | 342 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
14b31740 | 343 | symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 344 | this->got_plt_, |
ead1e424 | 345 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 346 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
347 | elfcpp::STV_HIDDEN, 0, |
348 | false, false); | |
349 | } | |
a3ad94ed | 350 | |
ead1e424 ILT |
351 | return this->got_; |
352 | } | |
353 | ||
5a6f7e2d ILT |
354 | // Get the dynamic reloc section, creating it if necessary. |
355 | ||
356 | Target_i386::Reloc_section* | |
357 | Target_i386::rel_dyn_section(Layout* layout) | |
358 | { | |
359 | if (this->rel_dyn_ == NULL) | |
360 | { | |
361 | gold_assert(layout != NULL); | |
362 | this->rel_dyn_ = new Reloc_section(); | |
363 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
364 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
365 | } | |
366 | return this->rel_dyn_; | |
367 | } | |
368 | ||
a3ad94ed ILT |
369 | // A class to handle the PLT data. |
370 | ||
371 | class Output_data_plt_i386 : public Output_section_data | |
372 | { | |
373 | public: | |
374 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
375 | ||
7e1edb90 | 376 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
377 | |
378 | // Add an entry to the PLT. | |
379 | void | |
380 | add_entry(Symbol* gsym); | |
381 | ||
16649710 ILT |
382 | // Return the .rel.plt section data. |
383 | const Reloc_section* | |
384 | rel_plt() const | |
385 | { return this->rel_; } | |
386 | ||
387 | protected: | |
388 | void | |
389 | do_adjust_output_section(Output_section* os); | |
390 | ||
a3ad94ed ILT |
391 | private: |
392 | // The size of an entry in the PLT. | |
393 | static const int plt_entry_size = 16; | |
394 | ||
395 | // The first entry in the PLT for an executable. | |
396 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
397 | ||
398 | // The first entry in the PLT for a shared object. | |
399 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
400 | ||
401 | // Other entries in the PLT for an executable. | |
402 | static unsigned char exec_plt_entry[plt_entry_size]; | |
403 | ||
404 | // Other entries in the PLT for a shared object. | |
405 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
406 | ||
407 | // Set the final size. | |
408 | void | |
409 | do_set_address(uint64_t, off_t) | |
410 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } | |
411 | ||
412 | // Write out the PLT data. | |
413 | void | |
414 | do_write(Output_file*); | |
415 | ||
416 | // The reloc section. | |
417 | Reloc_section* rel_; | |
418 | // The .got.plt section. | |
419 | Output_data_space* got_plt_; | |
420 | // The number of PLT entries. | |
421 | unsigned int count_; | |
a3ad94ed ILT |
422 | }; |
423 | ||
424 | // Create the PLT section. The ordinary .got section is an argument, | |
425 | // since we need to refer to the start. We also create our own .got | |
426 | // section just for PLT entries. | |
427 | ||
428 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 429 | Output_data_space* got_plt) |
80576242 | 430 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
431 | { |
432 | this->rel_ = new Reloc_section(); | |
433 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
434 | elfcpp::SHF_ALLOC, this->rel_); | |
435 | } | |
436 | ||
16649710 ILT |
437 | void |
438 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
439 | { | |
440 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
441 | // linker, and so do we. | |
442 | os->set_entsize(4); | |
443 | } | |
444 | ||
a3ad94ed ILT |
445 | // Add an entry to the PLT. |
446 | ||
447 | void | |
448 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
449 | { | |
450 | gold_assert(!gsym->has_plt_offset()); | |
451 | ||
452 | // Note that when setting the PLT offset we skip the initial | |
453 | // reserved PLT entry. | |
454 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
455 | ||
456 | ++this->count_; | |
457 | ||
458 | off_t got_offset = this->got_plt_->data_size(); | |
459 | ||
460 | // Every PLT entry needs a GOT entry which points back to the PLT | |
461 | // entry (this will be changed by the dynamic linker, normally | |
462 | // lazily when the function is called). | |
463 | this->got_plt_->set_space_size(got_offset + 4); | |
464 | ||
465 | // Every PLT entry needs a reloc. | |
16649710 | 466 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
467 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
468 | got_offset); | |
469 | ||
470 | // Note that we don't need to save the symbol. The contents of the | |
471 | // PLT are independent of which symbols are used. The symbols only | |
472 | // appear in the relocations. | |
473 | } | |
474 | ||
475 | // The first entry in the PLT for an executable. | |
476 | ||
477 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
478 | { | |
479 | 0xff, 0x35, // pushl contents of memory address | |
480 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
481 | 0xff, 0x25, // jmp indirect | |
482 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
483 | 0, 0, 0, 0 // unused | |
484 | }; | |
485 | ||
486 | // The first entry in the PLT for a shared object. | |
487 | ||
488 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
489 | { | |
490 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
491 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
492 | 0, 0, 0, 0 // unused | |
493 | }; | |
494 | ||
495 | // Subsequent entries in the PLT for an executable. | |
496 | ||
497 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
498 | { | |
499 | 0xff, 0x25, // jmp indirect | |
500 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
501 | 0x68, // pushl immediate | |
502 | 0, 0, 0, 0, // replaced with offset into relocation table | |
503 | 0xe9, // jmp relative | |
504 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
505 | }; | |
506 | ||
507 | // Subsequent entries in the PLT for a shared object. | |
508 | ||
509 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
510 | { | |
511 | 0xff, 0xa3, // jmp *offset(%ebx) | |
512 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
513 | 0x68, // pushl immediate | |
514 | 0, 0, 0, 0, // replaced with offset into relocation table | |
515 | 0xe9, // jmp relative | |
516 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
517 | }; | |
518 | ||
519 | // Write out the PLT. This uses the hand-coded instructions above, | |
520 | // and adjusts them as needed. This is all specified by the i386 ELF | |
521 | // Processor Supplement. | |
522 | ||
523 | void | |
524 | Output_data_plt_i386::do_write(Output_file* of) | |
525 | { | |
526 | const off_t offset = this->offset(); | |
527 | const off_t oview_size = this->data_size(); | |
528 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
529 | ||
530 | const off_t got_file_offset = this->got_plt_->offset(); | |
531 | const off_t got_size = this->got_plt_->data_size(); | |
532 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
533 | got_size); | |
534 | ||
535 | unsigned char* pov = oview; | |
536 | ||
537 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
538 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
539 | ||
7e1edb90 | 540 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
541 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
542 | else | |
543 | { | |
544 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
545 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
546 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
547 | } | |
548 | pov += plt_entry_size; | |
549 | ||
550 | unsigned char* got_pov = got_view; | |
551 | ||
552 | memset(got_pov, 0, 12); | |
553 | got_pov += 12; | |
554 | ||
555 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
556 | ||
557 | unsigned int plt_offset = plt_entry_size; | |
558 | unsigned int plt_rel_offset = 0; | |
559 | unsigned int got_offset = 12; | |
560 | const unsigned int count = this->count_; | |
561 | for (unsigned int i = 0; | |
562 | i < count; | |
563 | ++i, | |
564 | pov += plt_entry_size, | |
565 | got_pov += 4, | |
566 | plt_offset += plt_entry_size, | |
567 | plt_rel_offset += rel_size, | |
568 | got_offset += 4) | |
569 | { | |
570 | // Set and adjust the PLT entry itself. | |
571 | ||
7e1edb90 | 572 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
573 | { |
574 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
575 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
576 | } | |
577 | else | |
578 | { | |
579 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
580 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
581 | (got_address | |
582 | + got_offset)); | |
583 | } | |
584 | ||
585 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
586 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
587 | - (plt_offset + plt_entry_size)); | |
588 | ||
589 | // Set the entry in the GOT. | |
590 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
591 | } | |
592 | ||
593 | gold_assert(pov - oview == oview_size); | |
594 | gold_assert(got_pov - got_view == got_size); | |
595 | ||
596 | of->write_output_view(offset, oview_size, oview); | |
597 | of->write_output_view(got_file_offset, got_size, got_view); | |
598 | } | |
599 | ||
600 | // Create a PLT entry for a global symbol. | |
601 | ||
602 | void | |
7e1edb90 | 603 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
604 | { |
605 | if (gsym->has_plt_offset()) | |
606 | return; | |
607 | ||
608 | if (this->plt_ == NULL) | |
609 | { | |
610 | // Create the GOT sections first. | |
7e1edb90 | 611 | this->got_section(symtab, layout); |
a3ad94ed | 612 | |
7e1edb90 | 613 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
614 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
615 | (elfcpp::SHF_ALLOC | |
616 | | elfcpp::SHF_EXECINSTR), | |
617 | this->plt_); | |
a3ad94ed ILT |
618 | } |
619 | ||
620 | this->plt_->add_entry(gsym); | |
621 | } | |
622 | ||
623 | // Handle a relocation against a non-function symbol defined in a | |
624 | // dynamic object. The traditional way to handle this is to generate | |
625 | // a COPY relocation to copy the variable at runtime from the shared | |
626 | // object into the executable's data segment. However, this is | |
627 | // undesirable in general, as if the size of the object changes in the | |
628 | // dynamic object, the executable will no longer work correctly. If | |
629 | // this relocation is in a writable section, then we can create a | |
630 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
631 | // address at runtime. However, we do not want do that if the | |
632 | // relocation is in a read-only section, as it would prevent the | |
633 | // readonly segment from being shared. And if we have to eventually | |
634 | // generate a COPY reloc, then any dynamic relocations will be | |
635 | // useless. So this means that if this is a writable section, we need | |
636 | // to save the relocation until we see whether we have to create a | |
637 | // COPY relocation for this symbol for any other relocation. | |
638 | ||
639 | void | |
640 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
641 | Symbol_table* symtab, |
642 | Layout* layout, | |
a3ad94ed ILT |
643 | Sized_relobj<32, false>* object, |
644 | unsigned int data_shndx, Symbol* gsym, | |
5a6f7e2d | 645 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 646 | { |
5a6f7e2d ILT |
647 | Sized_symbol<32>* ssym; |
648 | ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym | |
649 | SELECT_SIZE(32)); | |
650 | ||
651 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
652 | data_shndx, ssym)) | |
a3ad94ed ILT |
653 | { |
654 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
655 | // If it turns out that we never need a COPY reloc for this |
656 | // symbol, then we will emit the relocation. | |
657 | if (this->copy_relocs_ == NULL) | |
658 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
659 | this->copy_relocs_->save(ssym, object, data_shndx, rel); | |
a3ad94ed | 660 | } |
5a6f7e2d ILT |
661 | else |
662 | { | |
663 | // Allocate space for this symbol in the .bss section. | |
664 | ||
665 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
666 | ||
667 | // There is no defined way to determine the required alignment | |
668 | // of the symbol. We pick the alignment based on the size. We | |
669 | // set an arbitrary maximum of 256. | |
670 | unsigned int align; | |
671 | for (align = 1; align < 512; align <<= 1) | |
672 | if ((symsize & align) != 0) | |
673 | break; | |
a3ad94ed | 674 | |
5a6f7e2d ILT |
675 | if (this->dynbss_ == NULL) |
676 | { | |
677 | this->dynbss_ = new Output_data_space(align); | |
678 | layout->add_output_section_data(".bss", | |
679 | elfcpp::SHT_NOBITS, | |
680 | (elfcpp::SHF_ALLOC | |
681 | | elfcpp::SHF_WRITE), | |
682 | this->dynbss_); | |
683 | } | |
684 | ||
685 | Output_data_space* dynbss = this->dynbss_; | |
686 | ||
687 | if (align > dynbss->addralign()) | |
688 | dynbss->set_space_alignment(align); | |
689 | ||
690 | off_t dynbss_size = dynbss->data_size(); | |
691 | dynbss_size = align_address(dynbss_size, align); | |
692 | off_t offset = dynbss_size; | |
693 | dynbss->set_space_size(dynbss_size + symsize); | |
694 | ||
46fe1623 | 695 | symtab->define_with_copy_reloc(this, ssym, dynbss, offset); |
5a6f7e2d ILT |
696 | |
697 | // Add the COPY reloc. | |
698 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
699 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
700 | } | |
a3ad94ed ILT |
701 | } |
702 | ||
92e059d8 | 703 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
704 | // symbol. IS_FINAL is true if the final address of this symbol is |
705 | // known at link time. | |
92e059d8 | 706 | |
af6359d5 | 707 | tls::Tls_optimization |
7e1edb90 | 708 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
709 | { |
710 | // If we are generating a shared library, then we can't do anything | |
711 | // in the linker. | |
7e1edb90 | 712 | if (parameters->output_is_shared()) |
af6359d5 | 713 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
714 | |
715 | switch (r_type) | |
716 | { | |
717 | case elfcpp::R_386_TLS_GD: | |
718 | case elfcpp::R_386_TLS_GOTDESC: | |
719 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 720 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
721 | // access. Since we know that we are generating an executable, |
722 | // we can convert this to Initial-Exec. If we also know that | |
723 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 724 | if (is_final) |
af6359d5 ILT |
725 | return tls::TLSOPT_TO_LE; |
726 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
727 | |
728 | case elfcpp::R_386_TLS_LDM: | |
729 | // This is Local-Dynamic, which refers to a local symbol in the | |
730 | // dynamic TLS block. Since we know that we generating an | |
731 | // executable, we can switch to Local-Exec. | |
af6359d5 | 732 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
733 | |
734 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
735 | // Another type of Local-Dynamic relocation. |
736 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
737 | |
738 | case elfcpp::R_386_TLS_IE: | |
739 | case elfcpp::R_386_TLS_GOTIE: | |
740 | case elfcpp::R_386_TLS_IE_32: | |
741 | // These are Initial-Exec relocs which get the thread offset | |
742 | // from the GOT. If we know that we are linking against the | |
743 | // local symbol, we can switch to Local-Exec, which links the | |
744 | // thread offset into the instruction. | |
a3ad94ed | 745 | if (is_final) |
af6359d5 ILT |
746 | return tls::TLSOPT_TO_LE; |
747 | return tls::TLSOPT_NONE; | |
8462ae85 | 748 | |
92e059d8 ILT |
749 | case elfcpp::R_386_TLS_LE: |
750 | case elfcpp::R_386_TLS_LE_32: | |
751 | // When we already have Local-Exec, there is nothing further we | |
752 | // can do. | |
af6359d5 | 753 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
754 | |
755 | default: | |
a3ad94ed | 756 | gold_unreachable(); |
92e059d8 ILT |
757 | } |
758 | } | |
759 | ||
af6359d5 ILT |
760 | // Report an unsupported relocation against a local symbol. |
761 | ||
762 | void | |
763 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
764 | unsigned int r_type) | |
765 | { | |
75f2446e ILT |
766 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
767 | object->name().c_str(), r_type); | |
af6359d5 ILT |
768 | } |
769 | ||
92e059d8 ILT |
770 | // Scan a relocation for a local symbol. |
771 | ||
772 | inline void | |
7e1edb90 | 773 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
774 | Symbol_table* symtab, |
775 | Layout* layout, | |
776 | Target_i386* target, | |
f6ce93d6 | 777 | Sized_relobj<32, false>* object, |
1b64748b ILT |
778 | unsigned int data_shndx, |
779 | const elfcpp::Rel<32, false>& reloc, | |
a3ad94ed | 780 | unsigned int r_type, |
92e059d8 ILT |
781 | const elfcpp::Sym<32, false>&) |
782 | { | |
783 | switch (r_type) | |
784 | { | |
785 | case elfcpp::R_386_NONE: | |
786 | case elfcpp::R_386_GNU_VTINHERIT: | |
787 | case elfcpp::R_386_GNU_VTENTRY: | |
788 | break; | |
789 | ||
790 | case elfcpp::R_386_32: | |
436ca963 ILT |
791 | // If building a shared library (or a position-independent |
792 | // executable), we need to create a dynamic relocation for | |
793 | // this location. The relocation applied at link time will | |
794 | // apply the link-time value, so we flag the location with | |
795 | // an R_386_RELATIVE relocation so the dynamic loader can | |
796 | // relocate it easily. | |
797 | if (parameters->output_is_position_independent()) | |
798 | { | |
799 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d61c6bd4 ILT |
800 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx, |
801 | reloc.get_r_offset()); | |
802 | } | |
803 | break; | |
804 | ||
805 | case elfcpp::R_386_16: | |
806 | case elfcpp::R_386_8: | |
807 | // If building a shared library (or a position-independent | |
808 | // executable), we need to create a dynamic relocation for | |
809 | // this location. Because the addend needs to remain in the | |
810 | // data section, we need to be careful not to apply this | |
811 | // relocation statically. | |
812 | if (parameters->output_is_position_independent()) | |
813 | { | |
814 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
815 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
816 | rel_dyn->add_local(object, r_sym, r_type, data_shndx, | |
817 | reloc.get_r_offset()); | |
436ca963 | 818 | } |
92e059d8 ILT |
819 | break; |
820 | ||
821 | case elfcpp::R_386_PC32: | |
822 | case elfcpp::R_386_PC16: | |
823 | case elfcpp::R_386_PC8: | |
824 | break; | |
825 | ||
df2efe71 ILT |
826 | case elfcpp::R_386_PLT32: |
827 | // Since we know this is a local symbol, we can handle this as a | |
828 | // PC32 reloc. | |
829 | break; | |
830 | ||
ead1e424 ILT |
831 | case elfcpp::R_386_GOTOFF: |
832 | case elfcpp::R_386_GOTPC: | |
833 | // We need a GOT section. | |
7e1edb90 | 834 | target->got_section(symtab, layout); |
ead1e424 ILT |
835 | break; |
836 | ||
1b64748b ILT |
837 | case elfcpp::R_386_GOT32: |
838 | { | |
839 | // The symbol requires a GOT entry. | |
840 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
841 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
842 | if (got->add_local(object, r_sym)) | |
843 | { | |
844 | // If we are generating a shared object, we need to add a | |
845 | // dynamic RELATIVE relocation for this symbol. | |
436ca963 | 846 | if (parameters->output_is_position_independent()) |
1b64748b ILT |
847 | { |
848 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
849 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, | |
850 | data_shndx, reloc.get_r_offset()); | |
851 | } | |
852 | } | |
853 | } | |
854 | break; | |
855 | ||
af6359d5 ILT |
856 | // These are relocations which should only be seen by the |
857 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
858 | case elfcpp::R_386_COPY: |
859 | case elfcpp::R_386_GLOB_DAT: | |
860 | case elfcpp::R_386_JUMP_SLOT: | |
861 | case elfcpp::R_386_RELATIVE: | |
862 | case elfcpp::R_386_TLS_TPOFF: | |
863 | case elfcpp::R_386_TLS_DTPMOD32: | |
864 | case elfcpp::R_386_TLS_DTPOFF32: | |
865 | case elfcpp::R_386_TLS_TPOFF32: | |
866 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 867 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 868 | object->name().c_str(), r_type); |
92e059d8 ILT |
869 | break; |
870 | ||
af6359d5 | 871 | // These are initial TLS relocs, which are expected when |
d61c17ea | 872 | // linking. |
56622147 ILT |
873 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
874 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
875 | case elfcpp::R_386_TLS_DESC_CALL: | |
876 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
877 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
878 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 879 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
880 | case elfcpp::R_386_TLS_GOTIE: |
881 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 882 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 883 | { |
80576242 | 884 | bool output_is_shared = parameters->output_is_shared(); |
af6359d5 ILT |
885 | const tls::Tls_optimization optimized_type |
886 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
887 | switch (r_type) |
888 | { | |
56622147 ILT |
889 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
890 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) | |
891 | case elfcpp::R_386_TLS_DESC_CALL: | |
892 | // FIXME: If not relaxing to LE, we need to generate | |
893 | // DTPMOD32 and DTPOFF32 relocs. | |
af6359d5 ILT |
894 | if (optimized_type != tls::TLSOPT_TO_LE) |
895 | unsupported_reloc_local(object, r_type); | |
896 | break; | |
897 | ||
56622147 | 898 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
af6359d5 ILT |
899 | // FIXME: If not relaxing to LE, we need to generate a |
900 | // DTPMOD32 reloc. | |
901 | if (optimized_type != tls::TLSOPT_TO_LE) | |
902 | unsupported_reloc_local(object, r_type); | |
903 | break; | |
904 | ||
56622147 | 905 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
906 | break; |
907 | ||
56622147 ILT |
908 | case elfcpp::R_386_TLS_IE: // Initial-exec |
909 | case elfcpp::R_386_TLS_IE_32: | |
910 | case elfcpp::R_386_TLS_GOTIE: | |
911 | // FIXME: If not relaxing to LE, we need to generate a | |
912 | // TPOFF or TPOFF32 reloc. | |
af6359d5 ILT |
913 | if (optimized_type != tls::TLSOPT_TO_LE) |
914 | unsupported_reloc_local(object, r_type); | |
7e1edb90 | 915 | break; |
af6359d5 | 916 | |
56622147 ILT |
917 | case elfcpp::R_386_TLS_LE: // Local-exec |
918 | case elfcpp::R_386_TLS_LE_32: | |
919 | // FIXME: If generating a shared object, we need to copy | |
920 | // this relocation into the object. | |
921 | gold_assert(!output_is_shared); | |
922 | break; | |
923 | ||
af6359d5 ILT |
924 | default: |
925 | gold_unreachable(); | |
7e1edb90 ILT |
926 | } |
927 | } | |
92e059d8 ILT |
928 | break; |
929 | ||
92e059d8 ILT |
930 | case elfcpp::R_386_32PLT: |
931 | case elfcpp::R_386_TLS_GD_32: | |
932 | case elfcpp::R_386_TLS_GD_PUSH: | |
933 | case elfcpp::R_386_TLS_GD_CALL: | |
934 | case elfcpp::R_386_TLS_GD_POP: | |
935 | case elfcpp::R_386_TLS_LDM_32: | |
936 | case elfcpp::R_386_TLS_LDM_PUSH: | |
937 | case elfcpp::R_386_TLS_LDM_CALL: | |
938 | case elfcpp::R_386_TLS_LDM_POP: | |
939 | case elfcpp::R_386_USED_BY_INTEL_200: | |
940 | default: | |
af6359d5 | 941 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
942 | break; |
943 | } | |
944 | } | |
945 | ||
af6359d5 ILT |
946 | // Report an unsupported relocation against a global symbol. |
947 | ||
948 | void | |
949 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
950 | unsigned int r_type, | |
951 | Symbol* gsym) | |
952 | { | |
75f2446e ILT |
953 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
954 | object->name().c_str(), r_type, gsym->name()); | |
af6359d5 ILT |
955 | } |
956 | ||
92e059d8 ILT |
957 | // Scan a relocation for a global symbol. |
958 | ||
959 | inline void | |
960 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
961 | Symbol_table* symtab, |
962 | Layout* layout, | |
963 | Target_i386* target, | |
f6ce93d6 | 964 | Sized_relobj<32, false>* object, |
a3ad94ed ILT |
965 | unsigned int data_shndx, |
966 | const elfcpp::Rel<32, false>& reloc, | |
967 | unsigned int r_type, | |
92e059d8 ILT |
968 | Symbol* gsym) |
969 | { | |
970 | switch (r_type) | |
971 | { | |
972 | case elfcpp::R_386_NONE: | |
973 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 974 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
975 | break; |
976 | ||
977 | case elfcpp::R_386_32: | |
92e059d8 | 978 | case elfcpp::R_386_16: |
92e059d8 | 979 | case elfcpp::R_386_8: |
96f2030e | 980 | { |
d61c6bd4 ILT |
981 | // Make a PLT entry if necessary. |
982 | if (gsym->needs_plt_entry()) | |
983 | { | |
984 | target->make_plt_entry(symtab, layout, gsym); | |
985 | // Since this is not a PC-relative relocation, we may be | |
986 | // taking the address of a function. In that case we need to | |
987 | // set the entry in the dynamic symbol table to the address of | |
988 | // the PLT entry. | |
989 | if (gsym->is_from_dynobj()) | |
990 | gsym->set_needs_dynsym_value(); | |
991 | } | |
992 | // Make a dynamic relocation if necessary. | |
993 | if (gsym->needs_dynamic_reloc(true, false)) | |
994 | { | |
995 | if (target->may_need_copy_reloc(gsym)) | |
996 | { | |
997 | target->copy_reloc(&options, symtab, layout, object, data_shndx, | |
998 | gsym, reloc); | |
999 | } | |
1000 | else if (r_type == elfcpp::R_386_32 | |
1001 | && gsym->can_use_relative_reloc(false)) | |
1002 | { | |
1003 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1004 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx, | |
1005 | reloc.get_r_offset()); | |
1006 | } | |
1007 | else | |
1008 | { | |
96f2030e ILT |
1009 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
1010 | rel_dyn->add_global(gsym, r_type, object, data_shndx, | |
1011 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1012 | } |
1013 | } | |
1014 | } | |
1015 | break; | |
1016 | ||
1017 | case elfcpp::R_386_PC32: | |
1018 | case elfcpp::R_386_PC16: | |
1019 | case elfcpp::R_386_PC8: | |
1020 | { | |
1021 | // Make a PLT entry if necessary. | |
1022 | if (gsym->needs_plt_entry()) | |
1023 | target->make_plt_entry(symtab, layout, gsym); | |
1024 | // Make a dynamic relocation if necessary. | |
1025 | bool is_function_call = (gsym->type() == elfcpp::STT_FUNC); | |
1026 | if (gsym->needs_dynamic_reloc(false, is_function_call)) | |
96f2030e | 1027 | { |
d61c6bd4 ILT |
1028 | if (target->may_need_copy_reloc(gsym)) |
1029 | { | |
1030 | target->copy_reloc(&options, symtab, layout, object, data_shndx, | |
1031 | gsym, reloc); | |
1032 | } | |
86849f1f | 1033 | else |
d61c6bd4 ILT |
1034 | { |
1035 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1036 | rel_dyn->add_global(gsym, r_type, object, data_shndx, | |
1037 | reloc.get_r_offset()); | |
1038 | } | |
96f2030e ILT |
1039 | } |
1040 | } | |
92e059d8 ILT |
1041 | break; |
1042 | ||
ead1e424 | 1043 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1044 | { |
1045 | // The symbol requires a GOT entry. | |
7e1edb90 | 1046 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
8462ae85 ILT |
1047 | if (got->add_global(gsym)) |
1048 | { | |
1049 | // If this symbol is not fully resolved, we need to add a | |
1050 | // dynamic relocation for it. | |
7e1edb90 | 1051 | if (!gsym->final_value_is_known()) |
8462ae85 ILT |
1052 | { |
1053 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
386c048c ILT |
1054 | if (gsym->is_from_dynobj() |
1055 | || gsym->is_preemptible()) | |
1056 | rel_dyn->add_global(gsym, elfcpp::R_386_GLOB_DAT, got, | |
1057 | gsym->got_offset()); | |
d61c6bd4 ILT |
1058 | else |
1059 | { | |
1060 | rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, | |
1061 | got, gsym->got_offset()); | |
1062 | // Make sure we write the link-time value to the GOT. | |
1063 | gsym->set_needs_value_in_got(); | |
1064 | } | |
8462ae85 ILT |
1065 | } |
1066 | } | |
1067 | } | |
ead1e424 ILT |
1068 | break; |
1069 | ||
1070 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1071 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1072 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1073 | if (gsym->final_value_is_known()) |
ead1e424 | 1074 | break; |
436ca963 ILT |
1075 | // If building a shared library, we can also skip the PLT entry |
1076 | // if the symbol is defined in the output file and is protected | |
1077 | // or hidden. | |
1078 | if (gsym->is_defined() | |
1079 | && !gsym->is_from_dynobj() | |
1080 | && !gsym->is_preemptible()) | |
1081 | break; | |
7e1edb90 | 1082 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1083 | break; |
1084 | ||
1085 | case elfcpp::R_386_GOTOFF: | |
1086 | case elfcpp::R_386_GOTPC: | |
1087 | // We need a GOT section. | |
7e1edb90 | 1088 | target->got_section(symtab, layout); |
ead1e424 ILT |
1089 | break; |
1090 | ||
af6359d5 ILT |
1091 | // These are relocations which should only be seen by the |
1092 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1093 | case elfcpp::R_386_COPY: |
1094 | case elfcpp::R_386_GLOB_DAT: | |
1095 | case elfcpp::R_386_JUMP_SLOT: | |
1096 | case elfcpp::R_386_RELATIVE: | |
1097 | case elfcpp::R_386_TLS_TPOFF: | |
1098 | case elfcpp::R_386_TLS_DTPMOD32: | |
1099 | case elfcpp::R_386_TLS_DTPOFF32: | |
1100 | case elfcpp::R_386_TLS_TPOFF32: | |
1101 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1102 | gold_error(_("%s: unexpected reloc %u in object file"), |
1103 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1104 | break; |
1105 | ||
d61c17ea ILT |
1106 | // These are initial tls relocs, which are expected when |
1107 | // linking. | |
56622147 ILT |
1108 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1109 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1110 | case elfcpp::R_386_TLS_DESC_CALL: | |
1111 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1112 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1113 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1114 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1115 | case elfcpp::R_386_TLS_GOTIE: |
1116 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1117 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1118 | { |
7e1edb90 | 1119 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1120 | const tls::Tls_optimization optimized_type |
1121 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1122 | switch (r_type) |
1123 | { | |
56622147 ILT |
1124 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1125 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) | |
1126 | case elfcpp::R_386_TLS_DESC_CALL: | |
1127 | // FIXME: If not relaxing to LE, we need to generate | |
1128 | // DTPMOD32 and DTPOFF32 relocs. | |
af6359d5 ILT |
1129 | if (optimized_type != tls::TLSOPT_TO_LE) |
1130 | unsupported_reloc_global(object, r_type, gsym); | |
1131 | break; | |
1132 | ||
56622147 | 1133 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
af6359d5 ILT |
1134 | // FIXME: If not relaxing to LE, we need to generate a |
1135 | // DTPMOD32 reloc. | |
1136 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1137 | unsupported_reloc_global(object, r_type, gsym); | |
1138 | break; | |
1139 | ||
56622147 | 1140 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1141 | break; |
1142 | ||
56622147 ILT |
1143 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1144 | case elfcpp::R_386_TLS_IE_32: | |
1145 | case elfcpp::R_386_TLS_GOTIE: | |
1146 | // FIXME: If not relaxing to LE, we need to generate a | |
1147 | // TPOFF or TPOFF32 reloc. | |
af6359d5 ILT |
1148 | if (optimized_type != tls::TLSOPT_TO_LE) |
1149 | unsupported_reloc_global(object, r_type, gsym); | |
a3ad94ed | 1150 | break; |
af6359d5 | 1151 | |
56622147 ILT |
1152 | case elfcpp::R_386_TLS_LE: // Local-exec |
1153 | case elfcpp::R_386_TLS_LE_32: | |
1154 | // FIXME: If generating a shared object, we need to copy | |
1155 | // this relocation into the object. | |
1156 | gold_assert(!parameters->output_is_shared()); | |
1157 | break; | |
1158 | ||
af6359d5 ILT |
1159 | default: |
1160 | gold_unreachable(); | |
a3ad94ed ILT |
1161 | } |
1162 | } | |
92e059d8 ILT |
1163 | break; |
1164 | ||
92e059d8 ILT |
1165 | case elfcpp::R_386_32PLT: |
1166 | case elfcpp::R_386_TLS_GD_32: | |
1167 | case elfcpp::R_386_TLS_GD_PUSH: | |
1168 | case elfcpp::R_386_TLS_GD_CALL: | |
1169 | case elfcpp::R_386_TLS_GD_POP: | |
1170 | case elfcpp::R_386_TLS_LDM_32: | |
1171 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1172 | case elfcpp::R_386_TLS_LDM_CALL: | |
1173 | case elfcpp::R_386_TLS_LDM_POP: | |
1174 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1175 | default: | |
af6359d5 | 1176 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1177 | break; |
1178 | } | |
1179 | } | |
1180 | ||
1181 | // Scan relocations for a section. | |
1182 | ||
1183 | void | |
1184 | Target_i386::scan_relocs(const General_options& options, | |
1185 | Symbol_table* symtab, | |
ead1e424 | 1186 | Layout* layout, |
f6ce93d6 | 1187 | Sized_relobj<32, false>* object, |
a3ad94ed | 1188 | unsigned int data_shndx, |
92e059d8 ILT |
1189 | unsigned int sh_type, |
1190 | const unsigned char* prelocs, | |
1191 | size_t reloc_count, | |
730cdc88 ILT |
1192 | Output_section* output_section, |
1193 | bool needs_special_offset_handling, | |
92e059d8 | 1194 | size_t local_symbol_count, |
730cdc88 | 1195 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1196 | { |
1197 | if (sh_type == elfcpp::SHT_RELA) | |
1198 | { | |
75f2446e ILT |
1199 | gold_error(_("%s: unsupported RELA reloc section"), |
1200 | object->name().c_str()); | |
1201 | return; | |
92e059d8 ILT |
1202 | } |
1203 | ||
ead1e424 ILT |
1204 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1205 | Target_i386::Scan>( | |
92e059d8 ILT |
1206 | options, |
1207 | symtab, | |
ead1e424 ILT |
1208 | layout, |
1209 | this, | |
92e059d8 | 1210 | object, |
a3ad94ed | 1211 | data_shndx, |
92e059d8 ILT |
1212 | prelocs, |
1213 | reloc_count, | |
730cdc88 ILT |
1214 | output_section, |
1215 | needs_special_offset_handling, | |
92e059d8 | 1216 | local_symbol_count, |
730cdc88 | 1217 | plocal_symbols); |
92e059d8 ILT |
1218 | } |
1219 | ||
16649710 | 1220 | // Finalize the sections. |
5a6f7e2d ILT |
1221 | |
1222 | void | |
7e1edb90 | 1223 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1224 | { |
16649710 ILT |
1225 | // Fill in some more dynamic tags. |
1226 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1227 | if (odyn != NULL) | |
1228 | { | |
1229 | if (this->got_plt_ != NULL) | |
1230 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1231 | ||
1232 | if (this->plt_ != NULL) | |
1233 | { | |
1234 | const Output_data* od = this->plt_->rel_plt(); | |
1235 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1236 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1237 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1238 | } | |
1239 | ||
1240 | if (this->rel_dyn_ != NULL) | |
1241 | { | |
1242 | const Output_data* od = this->rel_dyn_; | |
1243 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1244 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1245 | odyn->add_constant(elfcpp::DT_RELENT, | |
1246 | elfcpp::Elf_sizes<32>::rel_size); | |
1247 | } | |
1248 | ||
7e1edb90 | 1249 | if (!parameters->output_is_shared()) |
16649710 ILT |
1250 | { |
1251 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1252 | // linker at run time, and used by the debugger. | |
1253 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1258 | // relocs. | |
5a6f7e2d ILT |
1259 | if (this->copy_relocs_ == NULL) |
1260 | return; | |
1261 | if (this->copy_relocs_->any_to_emit()) | |
1262 | { | |
1263 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1264 | this->copy_relocs_->emit(rel_dyn); | |
1265 | } | |
1266 | delete this->copy_relocs_; | |
1267 | this->copy_relocs_ = NULL; | |
1268 | } | |
1269 | ||
86849f1f ILT |
1270 | // Return whether a direct absolute static relocation needs to be applied. |
1271 | // In cases where Scan::local() or Scan::global() has created | |
1272 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1273 | // of the relocation is carried in the data, and we must not | |
1274 | // apply the static relocation. | |
1275 | ||
1276 | inline bool | |
1277 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
d61c6bd4 ILT |
1278 | bool is_absolute_ref, |
1279 | bool is_function_call, | |
86849f1f ILT |
1280 | bool is_32bit) |
1281 | { | |
d61c6bd4 ILT |
1282 | // For local symbols, we will have created a non-RELATIVE dynamic |
1283 | // relocation only if (a) the output is position independent, | |
1284 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1285 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1286 | if (gsym == NULL) |
d61c6bd4 ILT |
1287 | return !(parameters->output_is_position_independent() |
1288 | && is_absolute_ref | |
1289 | && !is_32bit); | |
86849f1f | 1290 | |
d61c6bd4 ILT |
1291 | // For global symbols, we use the same helper routines used in the scan pass. |
1292 | return !(gsym->needs_dynamic_reloc(is_absolute_ref, is_function_call) | |
1293 | && !gsym->can_use_relative_reloc(is_function_call)); | |
86849f1f ILT |
1294 | } |
1295 | ||
61ba1cf9 ILT |
1296 | // Perform a relocation. |
1297 | ||
ead1e424 | 1298 | inline bool |
92e059d8 | 1299 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1300 | Target_i386* target, |
92e059d8 ILT |
1301 | size_t relnum, |
1302 | const elfcpp::Rel<32, false>& rel, | |
1303 | unsigned int r_type, | |
c06b7b0b | 1304 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1305 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1306 | unsigned char* view, |
1307 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1308 | off_t view_size) | |
61ba1cf9 | 1309 | { |
ead1e424 ILT |
1310 | if (this->skip_call_tls_get_addr_) |
1311 | { | |
1312 | if (r_type != elfcpp::R_386_PLT32 | |
1313 | || gsym == NULL | |
1314 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1315 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1316 | _("missing expected TLS relocation")); | |
1317 | else | |
ead1e424 | 1318 | { |
75f2446e ILT |
1319 | this->skip_call_tls_get_addr_ = false; |
1320 | return false; | |
ead1e424 | 1321 | } |
ead1e424 ILT |
1322 | } |
1323 | ||
a3ad94ed | 1324 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1325 | Symbol_value<32> symval; |
436ca963 ILT |
1326 | if (gsym != NULL |
1327 | && (gsym->is_from_dynobj() | |
1328 | || (parameters->output_is_shared() | |
1329 | && gsym->is_preemptible())) | |
1330 | && gsym->has_plt_offset()) | |
a3ad94ed | 1331 | { |
b8e6aad9 ILT |
1332 | symval.set_output_value(target->plt_section()->address() |
1333 | + gsym->plt_offset()); | |
1334 | psymval = &symval; | |
a3ad94ed ILT |
1335 | } |
1336 | ||
b8e6aad9 ILT |
1337 | const Sized_relobj<32, false>* object = relinfo->object; |
1338 | ||
1b64748b | 1339 | // Get the GOT offset if needed. |
96f2030e ILT |
1340 | // The GOT pointer points to the end of the GOT section. |
1341 | // We need to subtract the size of the GOT section to get | |
1342 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1343 | bool have_got_offset = false; |
1344 | unsigned int got_offset = 0; | |
1345 | switch (r_type) | |
1346 | { | |
1347 | case elfcpp::R_386_GOT32: | |
1348 | if (gsym != NULL) | |
1349 | { | |
1350 | gold_assert(gsym->has_got_offset()); | |
96f2030e | 1351 | got_offset = gsym->got_offset() - target->got_size(); |
1b64748b ILT |
1352 | } |
1353 | else | |
1354 | { | |
1355 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
96f2030e | 1356 | got_offset = object->local_got_offset(r_sym) - target->got_size(); |
1b64748b ILT |
1357 | } |
1358 | have_got_offset = true; | |
1359 | break; | |
1360 | ||
1361 | default: | |
1362 | break; | |
1363 | } | |
1364 | ||
61ba1cf9 ILT |
1365 | switch (r_type) |
1366 | { | |
1367 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1368 | case elfcpp::R_386_GNU_VTINHERIT: |
1369 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1370 | break; |
1371 | ||
1372 | case elfcpp::R_386_32: | |
d61c6bd4 | 1373 | if (should_apply_static_reloc(gsym, true, false, true)) |
86849f1f | 1374 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1375 | break; |
1376 | ||
1377 | case elfcpp::R_386_PC32: | |
d61c6bd4 ILT |
1378 | { |
1379 | bool is_function_call = (gsym != NULL | |
1380 | && gsym->type() == elfcpp::STT_FUNC); | |
1381 | if (should_apply_static_reloc(gsym, false, is_function_call, true)) | |
1382 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1383 | } | |
92e059d8 ILT |
1384 | break; |
1385 | ||
1386 | case elfcpp::R_386_16: | |
d61c6bd4 | 1387 | if (should_apply_static_reloc(gsym, true, false, false)) |
86849f1f | 1388 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1389 | break; |
1390 | ||
1391 | case elfcpp::R_386_PC16: | |
d61c6bd4 ILT |
1392 | { |
1393 | bool is_function_call = (gsym != NULL | |
1394 | && gsym->type() == elfcpp::STT_FUNC); | |
1395 | if (should_apply_static_reloc(gsym, false, is_function_call, false)) | |
1396 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1397 | } | |
61ba1cf9 ILT |
1398 | break; |
1399 | ||
92e059d8 | 1400 | case elfcpp::R_386_8: |
d61c6bd4 | 1401 | if (should_apply_static_reloc(gsym, true, false, false)) |
86849f1f | 1402 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1403 | break; |
1404 | ||
1405 | case elfcpp::R_386_PC8: | |
d61c6bd4 ILT |
1406 | { |
1407 | bool is_function_call = (gsym != NULL | |
1408 | && gsym->type() == elfcpp::STT_FUNC); | |
1409 | if (should_apply_static_reloc(gsym, false, is_function_call, false)) | |
1410 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1411 | } | |
92e059d8 ILT |
1412 | break; |
1413 | ||
ead1e424 | 1414 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1415 | gold_assert(gsym == NULL |
1416 | || gsym->has_plt_offset() | |
1417 | || gsym->final_value_is_known()); | |
b8e6aad9 | 1418 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1419 | break; |
1420 | ||
1421 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1422 | gold_assert(have_got_offset); |
1423 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1424 | break; |
1425 | ||
1426 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1427 | { |
1428 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1429 | value = (psymval->value(object, 0) | |
96f2030e | 1430 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1431 | Relocate_functions<32, false>::rel32(view, value); |
1432 | } | |
ead1e424 ILT |
1433 | break; |
1434 | ||
1435 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1436 | { |
1437 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1438 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1439 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1440 | } | |
ead1e424 ILT |
1441 | break; |
1442 | ||
92e059d8 ILT |
1443 | case elfcpp::R_386_COPY: |
1444 | case elfcpp::R_386_GLOB_DAT: | |
1445 | case elfcpp::R_386_JUMP_SLOT: | |
1446 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1447 | // These are outstanding tls relocs, which are unexpected when |
1448 | // linking. | |
92e059d8 ILT |
1449 | case elfcpp::R_386_TLS_TPOFF: |
1450 | case elfcpp::R_386_TLS_DTPMOD32: | |
1451 | case elfcpp::R_386_TLS_DTPOFF32: | |
1452 | case elfcpp::R_386_TLS_TPOFF32: | |
1453 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1454 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1455 | _("unexpected reloc %u in object file"), | |
1456 | r_type); | |
92e059d8 ILT |
1457 | break; |
1458 | ||
d61c17ea ILT |
1459 | // These are initial tls relocs, which are expected when |
1460 | // linking. | |
56622147 ILT |
1461 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1462 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1463 | case elfcpp::R_386_TLS_DESC_CALL: | |
1464 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1465 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1466 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1467 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1468 | case elfcpp::R_386_TLS_GOTIE: |
1469 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1470 | case elfcpp::R_386_TLS_LE_32: |
b8e6aad9 | 1471 | this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view, |
ead1e424 | 1472 | address, view_size); |
92e059d8 ILT |
1473 | break; |
1474 | ||
92e059d8 ILT |
1475 | case elfcpp::R_386_32PLT: |
1476 | case elfcpp::R_386_TLS_GD_32: | |
1477 | case elfcpp::R_386_TLS_GD_PUSH: | |
1478 | case elfcpp::R_386_TLS_GD_CALL: | |
1479 | case elfcpp::R_386_TLS_GD_POP: | |
1480 | case elfcpp::R_386_TLS_LDM_32: | |
1481 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1482 | case elfcpp::R_386_TLS_LDM_CALL: | |
1483 | case elfcpp::R_386_TLS_LDM_POP: | |
1484 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1485 | default: |
75f2446e ILT |
1486 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1487 | _("unsupported reloc %u"), | |
1488 | r_type); | |
92e059d8 ILT |
1489 | break; |
1490 | } | |
ead1e424 ILT |
1491 | |
1492 | return true; | |
92e059d8 ILT |
1493 | } |
1494 | ||
1495 | // Perform a TLS relocation. | |
1496 | ||
1497 | inline void | |
1498 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
1499 | size_t relnum, | |
1500 | const elfcpp::Rel<32, false>& rel, | |
1501 | unsigned int r_type, | |
c06b7b0b | 1502 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1503 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1504 | unsigned char* view, |
1505 | elfcpp::Elf_types<32>::Elf_Addr, | |
1506 | off_t view_size) | |
1507 | { | |
1508 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
1509 | if (tls_segment == NULL) | |
1510 | { | |
75f2446e ILT |
1511 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1512 | _("TLS reloc but no TLS segment")); | |
1513 | return; | |
92e059d8 ILT |
1514 | } |
1515 | ||
b8e6aad9 ILT |
1516 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(relinfo->object, 0); |
1517 | ||
a3ad94ed | 1518 | const bool is_final = (gsym == NULL |
436ca963 | 1519 | ? !parameters->output_is_position_independent() |
7e1edb90 | 1520 | : gsym->final_value_is_known()); |
af6359d5 ILT |
1521 | const tls::Tls_optimization optimized_type |
1522 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1523 | switch (r_type) |
1524 | { | |
56622147 | 1525 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1526 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1527 | { |
56622147 ILT |
1528 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1529 | rel, r_type, value, view, | |
1530 | view_size); | |
92e059d8 ILT |
1531 | break; |
1532 | } | |
75f2446e ILT |
1533 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1534 | _("unsupported reloc %u"), | |
1535 | r_type); | |
92e059d8 ILT |
1536 | break; |
1537 | ||
56622147 ILT |
1538 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1539 | case elfcpp::R_386_TLS_DESC_CALL: | |
75f2446e ILT |
1540 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1541 | _("unsupported reloc %u"), | |
1542 | r_type); | |
ead1e424 ILT |
1543 | break; |
1544 | ||
56622147 | 1545 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1546 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1547 | { | |
75f2446e ILT |
1548 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1549 | _("both SUN and GNU model " | |
1550 | "TLS relocations")); | |
1551 | break; | |
46cf9fa2 ILT |
1552 | } |
1553 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1554 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 ILT |
1555 | { |
1556 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, | |
1557 | value, view, view_size); | |
1558 | break; | |
1559 | } | |
75f2446e ILT |
1560 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1561 | _("unsupported reloc %u"), | |
1562 | r_type); | |
46cf9fa2 ILT |
1563 | break; |
1564 | ||
56622147 | 1565 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1566 | // This reloc can appear in debugging sections, in which case we |
1567 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1568 | // tells us this. | |
af6359d5 | 1569 | if (optimized_type != tls::TLSOPT_TO_LE |
46cf9fa2 ILT |
1570 | || this->local_dynamic_type_ == LOCAL_DYNAMIC_NONE) |
1571 | value = value - tls_segment->vaddr(); | |
1572 | else if (this->local_dynamic_type_ == LOCAL_DYNAMIC_GNU) | |
1573 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1574 | else | |
1575 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1576 | Relocate_functions<32, false>::rel32(view, value); | |
1577 | break; | |
1578 | ||
56622147 ILT |
1579 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1580 | case elfcpp::R_386_TLS_GOTIE: | |
1581 | case elfcpp::R_386_TLS_IE_32: | |
1582 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1583 | { | |
1584 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, | |
1585 | rel, r_type, value, view, | |
1586 | view_size); | |
1587 | break; | |
1588 | } | |
75f2446e ILT |
1589 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1590 | _("unsupported reloc %u"), | |
1591 | r_type); | |
92e059d8 | 1592 | break; |
92e059d8 | 1593 | |
56622147 ILT |
1594 | case elfcpp::R_386_TLS_LE: // Local-exec |
1595 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1596 | Relocate_functions<32, false>::rel32(view, value); | |
1597 | break; | |
92e059d8 | 1598 | |
56622147 ILT |
1599 | case elfcpp::R_386_TLS_LE_32: |
1600 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1601 | Relocate_functions<32, false>::rel32(view, value); | |
1602 | break; | |
92e059d8 | 1603 | } |
92e059d8 ILT |
1604 | } |
1605 | ||
e041f13d | 1606 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1607 | // Local-Exec. |
1608 | ||
1609 | inline void | |
1610 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1611 | size_t relnum, | |
1612 | Output_segment* tls_segment, | |
1613 | const elfcpp::Rel<32, false>& rel, | |
1614 | unsigned int, | |
1615 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1616 | unsigned char* view, | |
1617 | off_t view_size) | |
1618 | { | |
1619 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 1620 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
1621 | // leal foo(%reg),%eax; call ___tls_get_addr |
1622 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
1623 | ||
af6359d5 ILT |
1624 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1625 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
1626 | |
1627 | unsigned char op1 = view[-1]; | |
1628 | unsigned char op2 = view[-2]; | |
1629 | ||
af6359d5 ILT |
1630 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1631 | op2 == 0x8d || op2 == 0x04); | |
1632 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
1633 | |
1634 | int roff = 5; | |
1635 | ||
1636 | if (op2 == 0x04) | |
1637 | { | |
af6359d5 ILT |
1638 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
1639 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1640 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1641 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
1642 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
1643 | } | |
1644 | else | |
1645 | { | |
af6359d5 ILT |
1646 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1647 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
d61c17ea ILT |
1648 | if (static_cast<off_t>(rel.get_r_offset() + 9) < view_size |
1649 | && view[9] == 0x90) | |
ead1e424 ILT |
1650 | { |
1651 | // There is a trailing nop. Use the size byte subl. | |
1652 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1653 | roff = 6; | |
1654 | } | |
1655 | else | |
1656 | { | |
1657 | // Use the five byte subl. | |
1658 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1663 | Relocate_functions<32, false>::rel32(view + roff, value); | |
1664 | ||
1665 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1666 | // We can skip it. | |
1667 | this->skip_call_tls_get_addr_ = true; | |
1668 | } | |
1669 | ||
46cf9fa2 ILT |
1670 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
1671 | // Local-Exec. | |
1672 | ||
1673 | inline void | |
1674 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
1675 | size_t relnum, | |
1676 | Output_segment*, | |
1677 | const elfcpp::Rel<32, false>& rel, | |
1678 | unsigned int, | |
1679 | elfcpp::Elf_types<32>::Elf_Addr, | |
1680 | unsigned char* view, | |
1681 | off_t view_size) | |
1682 | { | |
1683 | // leal foo(%reg), %eax; call ___tls_get_addr | |
1684 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
1685 | ||
af6359d5 ILT |
1686 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1687 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
1688 | |
1689 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
1690 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1691 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 1692 | |
af6359d5 | 1693 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
1694 | |
1695 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
1696 | ||
1697 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1698 | // We can skip it. | |
1699 | this->skip_call_tls_get_addr_ = true; | |
1700 | } | |
1701 | ||
56622147 ILT |
1702 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1703 | // Local-Exec. | |
1704 | ||
1705 | inline void | |
1706 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
1707 | size_t relnum, | |
1708 | Output_segment* tls_segment, | |
1709 | const elfcpp::Rel<32, false>& rel, | |
1710 | unsigned int r_type, | |
1711 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1712 | unsigned char* view, | |
1713 | off_t view_size) | |
1714 | { | |
1715 | // We have to actually change the instructions, which means that we | |
1716 | // need to examine the opcodes to figure out which instruction we | |
1717 | // are looking at. | |
1718 | if (r_type == elfcpp::R_386_TLS_IE) | |
1719 | { | |
1720 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
1721 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
1722 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
1723 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
1724 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
1725 | ||
1726 | unsigned char op1 = view[-1]; | |
1727 | if (op1 == 0xa1) | |
1728 | { | |
1729 | // movl XX,%eax ==> movl $YY,%eax | |
1730 | view[-1] = 0xb8; | |
1731 | } | |
1732 | else | |
1733 | { | |
1734 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
1735 | ||
1736 | unsigned char op2 = view[-2]; | |
1737 | if (op2 == 0x8b) | |
1738 | { | |
1739 | // movl XX,%reg ==> movl $YY,%reg | |
1740 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1741 | (op1 & 0xc7) == 0x05); | |
1742 | view[-2] = 0xc7; | |
1743 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1744 | } | |
1745 | else if (op2 == 0x03) | |
1746 | { | |
1747 | // addl XX,%reg ==> addl $YY,%reg | |
1748 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1749 | (op1 & 0xc7) == 0x05); | |
1750 | view[-2] = 0x81; | |
1751 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1752 | } | |
1753 | else | |
1754 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
1755 | } | |
1756 | } | |
1757 | else | |
1758 | { | |
1759 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
1760 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
1761 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
1762 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
1763 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
1764 | ||
1765 | unsigned char op1 = view[-1]; | |
1766 | unsigned char op2 = view[-2]; | |
1767 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1768 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
1769 | if (op2 == 0x8b) | |
1770 | { | |
1771 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
1772 | view[-2] = 0xc7; | |
1773 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1774 | } | |
1775 | else if (op2 == 0x2b) | |
1776 | { | |
1777 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
1778 | view[-2] = 0x81; | |
1779 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
1780 | } | |
1781 | else if (op2 == 0x03) | |
1782 | { | |
1783 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
1784 | view[-2] = 0x81; | |
1785 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
1786 | } | |
1787 | else | |
1788 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
1789 | } | |
1790 | ||
1791 | value = tls_segment->vaddr() + tls_segment->memsz() - value; | |
1792 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) | |
1793 | value = - value; | |
1794 | ||
1795 | Relocate_functions<32, false>::rel32(view, value); | |
1796 | } | |
1797 | ||
61ba1cf9 ILT |
1798 | // Relocate section data. |
1799 | ||
1800 | void | |
92e059d8 | 1801 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
1802 | unsigned int sh_type, |
1803 | const unsigned char* prelocs, | |
1804 | size_t reloc_count, | |
730cdc88 ILT |
1805 | Output_section* output_section, |
1806 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
1807 | unsigned char* view, |
1808 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1809 | off_t view_size) | |
1810 | { | |
a3ad94ed | 1811 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 1812 | |
ead1e424 ILT |
1813 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
1814 | Target_i386::Relocate>( | |
92e059d8 | 1815 | relinfo, |
ead1e424 | 1816 | this, |
61ba1cf9 ILT |
1817 | prelocs, |
1818 | reloc_count, | |
730cdc88 ILT |
1819 | output_section, |
1820 | needs_special_offset_handling, | |
61ba1cf9 ILT |
1821 | view, |
1822 | address, | |
1823 | view_size); | |
1824 | } | |
1825 | ||
ab5c9e90 ILT |
1826 | // Return the value to use for a dynamic which requires special |
1827 | // treatment. This is how we support equality comparisons of function | |
1828 | // pointers across shared library boundaries, as described in the | |
1829 | // processor specific ABI supplement. | |
1830 | ||
1831 | uint64_t | |
1832 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
1833 | { | |
1834 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
1835 | return this->plt_section()->address() + gsym->plt_offset(); | |
1836 | } | |
1837 | ||
c51e6221 ILT |
1838 | // Return a string used to fill a code section with nops to take up |
1839 | // the specified length. | |
1840 | ||
1841 | std::string | |
1842 | Target_i386::do_code_fill(off_t length) | |
1843 | { | |
1844 | if (length >= 16) | |
1845 | { | |
1846 | // Build a jmp instruction to skip over the bytes. | |
1847 | unsigned char jmp[5]; | |
1848 | jmp[0] = 0xe9; | |
1849 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
1850 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
1851 | + std::string(length - 5, '\0')); | |
1852 | } | |
1853 | ||
1854 | // Nop sequences of various lengths. | |
1855 | const char nop1[1] = { 0x90 }; // nop | |
1856 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1857 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
1858 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
1859 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
1860 | 0x00 }; // leal 0(%esi,1),%esi | |
1861 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1862 | 0x00, 0x00 }; | |
1863 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1864 | 0x00, 0x00, 0x00 }; | |
1865 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
1866 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
1867 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
1868 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1869 | 0x00 }; | |
1870 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
1871 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1872 | 0x00, 0x00 }; | |
1873 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
1874 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
1875 | 0x00, 0x00, 0x00 }; | |
1876 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1877 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
1878 | 0x00, 0x00, 0x00, 0x00 }; | |
1879 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1880 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
1881 | 0x27, 0x00, 0x00, 0x00, | |
1882 | 0x00 }; | |
1883 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1884 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
1885 | 0xbc, 0x27, 0x00, 0x00, | |
1886 | 0x00, 0x00 }; | |
1887 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
1888 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
1889 | 0x90, 0x90, 0x90, 0x90, | |
1890 | 0x90, 0x90, 0x90 }; | |
1891 | ||
1892 | const char* nops[16] = { | |
1893 | NULL, | |
1894 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
1895 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
1896 | }; | |
1897 | ||
1898 | return std::string(nops[length], length); | |
1899 | } | |
1900 | ||
14bfc3f5 ILT |
1901 | // The selector for i386 object files. |
1902 | ||
1903 | class Target_selector_i386 : public Target_selector | |
1904 | { | |
1905 | public: | |
1906 | Target_selector_i386() | |
1907 | : Target_selector(elfcpp::EM_386, 32, false) | |
1908 | { } | |
1909 | ||
1910 | Target* | |
ead1e424 ILT |
1911 | recognize(int machine, int osabi, int abiversion); |
1912 | ||
1913 | private: | |
1914 | Target_i386* target_; | |
14bfc3f5 ILT |
1915 | }; |
1916 | ||
1917 | // Recognize an i386 object file when we already know that the machine | |
1918 | // number is EM_386. | |
1919 | ||
1920 | Target* | |
ead1e424 | 1921 | Target_selector_i386::recognize(int, int, int) |
14bfc3f5 | 1922 | { |
ead1e424 ILT |
1923 | if (this->target_ == NULL) |
1924 | this->target_ = new Target_i386(); | |
1925 | return this->target_; | |
14bfc3f5 ILT |
1926 | } |
1927 | ||
1928 | Target_selector_i386 target_selector_i386; | |
1929 | ||
1930 | } // End anonymous namespace. |