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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 | 59 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
94c4710f | 60 | copy_relocs_(NULL), dynbss_(NULL), got_mod_index_offset_(-1U) |
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, | |
fe8718a4 | 97 | section_size_type view_size); |
92e059d8 | 98 | |
6a74a719 ILT |
99 | // Scan the relocs during a relocatable link. |
100 | void | |
101 | scan_relocatable_relocs(const General_options& options, | |
102 | Symbol_table* symtab, | |
103 | Layout* layout, | |
104 | Sized_relobj<32, false>* object, | |
105 | unsigned int data_shndx, | |
106 | unsigned int sh_type, | |
107 | const unsigned char* prelocs, | |
108 | size_t reloc_count, | |
109 | Output_section* output_section, | |
110 | bool needs_special_offset_handling, | |
111 | size_t local_symbol_count, | |
112 | const unsigned char* plocal_symbols, | |
113 | Relocatable_relocs*); | |
114 | ||
115 | // Relocate a section during a relocatable link. | |
116 | void | |
117 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
118 | unsigned int sh_type, | |
119 | const unsigned char* prelocs, | |
120 | size_t reloc_count, | |
121 | Output_section* output_section, | |
122 | off_t offset_in_output_section, | |
123 | const Relocatable_relocs*, | |
124 | unsigned char* view, | |
125 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
126 | section_size_type view_size, | |
127 | unsigned char* reloc_view, | |
128 | section_size_type reloc_view_size); | |
129 | ||
c51e6221 ILT |
130 | // Return a string used to fill a code section with nops. |
131 | std::string | |
fe8718a4 | 132 | do_code_fill(section_size_type length); |
c51e6221 | 133 | |
9a2d6984 ILT |
134 | // Return whether SYM is defined by the ABI. |
135 | bool | |
136 | do_is_defined_by_abi(Symbol* sym) const | |
137 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } | |
138 | ||
96f2030e | 139 | // Return the size of the GOT section. |
fe8718a4 | 140 | section_size_type |
96f2030e ILT |
141 | got_size() |
142 | { | |
143 | gold_assert(this->got_ != NULL); | |
144 | return this->got_->data_size(); | |
145 | } | |
146 | ||
92e059d8 ILT |
147 | private: |
148 | // The class which scans relocations. | |
149 | struct Scan | |
61ba1cf9 ILT |
150 | { |
151 | inline void | |
ead1e424 ILT |
152 | local(const General_options& options, Symbol_table* symtab, |
153 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 154 | Sized_relobj<32, false>* object, |
a3ad94ed | 155 | unsigned int data_shndx, |
07f397ab | 156 | Output_section* output_section, |
92e059d8 ILT |
157 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
158 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 159 | |
92e059d8 | 160 | inline void |
ead1e424 ILT |
161 | global(const General_options& options, Symbol_table* symtab, |
162 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 163 | Sized_relobj<32, false>* object, |
a3ad94ed | 164 | unsigned int data_shndx, |
07f397ab | 165 | Output_section* output_section, |
92e059d8 ILT |
166 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
167 | Symbol* gsym); | |
af6359d5 ILT |
168 | |
169 | static void | |
170 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
171 | ||
172 | static void | |
173 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
174 | Symbol*); | |
61ba1cf9 ILT |
175 | }; |
176 | ||
92e059d8 ILT |
177 | // The class which implements relocation. |
178 | class Relocate | |
179 | { | |
180 | public: | |
ead1e424 | 181 | Relocate() |
46cf9fa2 ILT |
182 | : skip_call_tls_get_addr_(false), |
183 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
184 | { } |
185 | ||
186 | ~Relocate() | |
187 | { | |
188 | if (this->skip_call_tls_get_addr_) | |
189 | { | |
190 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 191 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
192 | } |
193 | } | |
194 | ||
86849f1f ILT |
195 | // Return whether the static relocation needs to be applied. |
196 | inline bool | |
197 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 198 | int ref_flags, |
86849f1f ILT |
199 | bool is_32bit); |
200 | ||
ead1e424 ILT |
201 | // Do a relocation. Return false if the caller should not issue |
202 | // any warnings about this relocation. | |
203 | inline bool | |
204 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 205 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 206 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 207 | const Symbol_value<32>*, |
92e059d8 | 208 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 209 | section_size_type); |
92e059d8 ILT |
210 | |
211 | private: | |
212 | // Do a TLS relocation. | |
ead1e424 | 213 | inline void |
07f397ab ILT |
214 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
215 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 216 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 217 | const Symbol_value<32>*, |
fe8718a4 ILT |
218 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
219 | section_size_type); | |
92e059d8 | 220 | |
07f397ab ILT |
221 | // Do a TLS General-Dynamic to Initial-Exec transition. |
222 | inline void | |
223 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
224 | Output_segment* tls_segment, | |
225 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
226 | elfcpp::Elf_types<32>::Elf_Addr value, | |
227 | unsigned char* view, | |
fe8718a4 | 228 | section_size_type view_size); |
07f397ab | 229 | |
56622147 ILT |
230 | // Do a TLS General-Dynamic to Local-Exec transition. |
231 | inline void | |
232 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
233 | Output_segment* tls_segment, |
234 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
235 | elfcpp::Elf_types<32>::Elf_Addr value, | |
236 | unsigned char* view, | |
fe8718a4 | 237 | section_size_type view_size); |
92e059d8 | 238 | |
56622147 | 239 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 240 | inline void |
56622147 | 241 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
242 | Output_segment* tls_segment, |
243 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
244 | elfcpp::Elf_types<32>::Elf_Addr value, | |
245 | unsigned char* view, | |
fe8718a4 | 246 | section_size_type view_size); |
ead1e424 | 247 | |
56622147 ILT |
248 | // Do a TLS Initial-Exec to Local-Exec transition. |
249 | static inline void | |
250 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
251 | Output_segment* tls_segment, |
252 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
253 | elfcpp::Elf_types<32>::Elf_Addr value, | |
254 | unsigned char* view, | |
fe8718a4 | 255 | section_size_type view_size); |
46cf9fa2 | 256 | |
46cf9fa2 ILT |
257 | // We need to keep track of which type of local dynamic relocation |
258 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
259 | enum Local_dynamic_type | |
260 | { | |
261 | LOCAL_DYNAMIC_NONE, | |
262 | LOCAL_DYNAMIC_SUN, | |
263 | LOCAL_DYNAMIC_GNU | |
264 | }; | |
265 | ||
ead1e424 ILT |
266 | // This is set if we should skip the next reloc, which should be a |
267 | // PLT32 reloc against ___tls_get_addr. | |
268 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
269 | // The type of local dynamic relocation we have seen in the section |
270 | // being relocated, if any. | |
271 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
272 | }; |
273 | ||
6a74a719 ILT |
274 | // A class which returns the size required for a relocation type, |
275 | // used while scanning relocs during a relocatable link. | |
276 | class Relocatable_size_for_reloc | |
277 | { | |
278 | public: | |
279 | unsigned int | |
280 | get_size_for_reloc(unsigned int, Relobj*); | |
281 | }; | |
282 | ||
92e059d8 ILT |
283 | // Adjust TLS relocation type based on the options and whether this |
284 | // is a local symbol. | |
af6359d5 | 285 | static tls::Tls_optimization |
7e1edb90 | 286 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 287 | |
ead1e424 | 288 | // Get the GOT section, creating it if necessary. |
dbe717ef | 289 | Output_data_got<32, false>* |
7e1edb90 | 290 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 291 | |
96f2030e ILT |
292 | // Get the GOT PLT section. |
293 | Output_data_space* | |
294 | got_plt_section() const | |
295 | { | |
296 | gold_assert(this->got_plt_ != NULL); | |
297 | return this->got_plt_; | |
298 | } | |
299 | ||
a3ad94ed ILT |
300 | // Create a PLT entry for a global symbol. |
301 | void | |
7e1edb90 | 302 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 303 | |
94c4710f ILT |
304 | // Create a GOT entry for the TLS module index. |
305 | unsigned int | |
306 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
307 | Sized_relobj<32, false>* object); | |
308 | ||
a3ad94ed | 309 | // Get the PLT section. |
7bb3655e | 310 | const Output_data_plt_i386* |
a3ad94ed ILT |
311 | plt_section() const |
312 | { | |
313 | gold_assert(this->plt_ != NULL); | |
314 | return this->plt_; | |
315 | } | |
316 | ||
5a6f7e2d ILT |
317 | // Get the dynamic reloc section, creating it if necessary. |
318 | Reloc_section* | |
319 | rel_dyn_section(Layout*); | |
320 | ||
d61c6bd4 ILT |
321 | // Return true if the symbol may need a COPY relocation. |
322 | // References from an executable object to non-function symbols | |
323 | // defined in a dynamic object may need a COPY relocation. | |
324 | bool | |
325 | may_need_copy_reloc(Symbol* gsym) | |
326 | { | |
327 | return (!parameters->output_is_shared() | |
328 | && gsym->is_from_dynobj() | |
329 | && gsym->type() != elfcpp::STT_FUNC); | |
330 | } | |
331 | ||
a3ad94ed ILT |
332 | // Copy a relocation against a global symbol. |
333 | void | |
5a6f7e2d ILT |
334 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
335 | Sized_relobj<32, false>*, unsigned int, | |
4f4c5f80 | 336 | Output_section*, Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 337 | |
92e059d8 ILT |
338 | // Information about this specific target which we pass to the |
339 | // general Target structure. | |
75f65a3e | 340 | static const Target::Target_info i386_info; |
ead1e424 ILT |
341 | |
342 | // The GOT section. | |
dbe717ef | 343 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
344 | // The PLT section. |
345 | Output_data_plt_i386* plt_; | |
346 | // The GOT PLT section. | |
347 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
348 | // The dynamic reloc section. |
349 | Reloc_section* rel_dyn_; | |
350 | // Relocs saved to avoid a COPY reloc. | |
351 | Copy_relocs<32, false>* copy_relocs_; | |
352 | // Space for variables copied with a COPY reloc. | |
353 | Output_data_space* dynbss_; | |
94c4710f ILT |
354 | // Offset of the GOT entry for the TLS module index; |
355 | unsigned int got_mod_index_offset_; | |
75f65a3e ILT |
356 | }; |
357 | ||
358 | const Target::Target_info Target_i386::i386_info = | |
359 | { | |
61ba1cf9 ILT |
360 | 32, // size |
361 | false, // is_big_endian | |
362 | elfcpp::EM_386, // machine_code | |
363 | false, // has_make_symbol | |
dbe717ef | 364 | false, // has_resolve |
c51e6221 | 365 | true, // has_code_fill |
35cdfc9a | 366 | true, // is_default_stack_executable |
dbe717ef | 367 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 368 | 0x08048000, // default_text_segment_address |
61ba1cf9 ILT |
369 | 0x1000, // abi_pagesize |
370 | 0x1000 // common_pagesize | |
14bfc3f5 ILT |
371 | }; |
372 | ||
ead1e424 ILT |
373 | // Get the GOT section, creating it if necessary. |
374 | ||
dbe717ef | 375 | Output_data_got<32, false>* |
7e1edb90 | 376 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
377 | { |
378 | if (this->got_ == NULL) | |
379 | { | |
7e1edb90 | 380 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 381 | |
7e1edb90 | 382 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 383 | |
ead1e424 | 384 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
385 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
386 | this->got_); | |
ead1e424 | 387 | |
a3ad94ed ILT |
388 | // The old GNU linker creates a .got.plt section. We just |
389 | // create another set of data in the .got section. Note that we | |
390 | // always create a PLT if we create a GOT, although the PLT | |
391 | // might be empty. | |
392 | this->got_plt_ = new Output_data_space(4); | |
393 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
394 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
395 | this->got_plt_); | |
a3ad94ed | 396 | |
ead1e424 | 397 | // The first three entries are reserved. |
27bc2bce | 398 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 399 | |
a3ad94ed | 400 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 401 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 402 | this->got_plt_, |
ead1e424 | 403 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 404 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
405 | elfcpp::STV_HIDDEN, 0, |
406 | false, false); | |
407 | } | |
a3ad94ed | 408 | |
ead1e424 ILT |
409 | return this->got_; |
410 | } | |
411 | ||
5a6f7e2d ILT |
412 | // Get the dynamic reloc section, creating it if necessary. |
413 | ||
414 | Target_i386::Reloc_section* | |
415 | Target_i386::rel_dyn_section(Layout* layout) | |
416 | { | |
417 | if (this->rel_dyn_ == NULL) | |
418 | { | |
419 | gold_assert(layout != NULL); | |
420 | this->rel_dyn_ = new Reloc_section(); | |
421 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
422 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
423 | } | |
424 | return this->rel_dyn_; | |
425 | } | |
426 | ||
a3ad94ed ILT |
427 | // A class to handle the PLT data. |
428 | ||
429 | class Output_data_plt_i386 : public Output_section_data | |
430 | { | |
431 | public: | |
432 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
433 | ||
7e1edb90 | 434 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
435 | |
436 | // Add an entry to the PLT. | |
437 | void | |
438 | add_entry(Symbol* gsym); | |
439 | ||
16649710 ILT |
440 | // Return the .rel.plt section data. |
441 | const Reloc_section* | |
442 | rel_plt() const | |
443 | { return this->rel_; } | |
444 | ||
445 | protected: | |
446 | void | |
447 | do_adjust_output_section(Output_section* os); | |
448 | ||
a3ad94ed ILT |
449 | private: |
450 | // The size of an entry in the PLT. | |
451 | static const int plt_entry_size = 16; | |
452 | ||
453 | // The first entry in the PLT for an executable. | |
454 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
455 | ||
456 | // The first entry in the PLT for a shared object. | |
457 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
458 | ||
459 | // Other entries in the PLT for an executable. | |
460 | static unsigned char exec_plt_entry[plt_entry_size]; | |
461 | ||
462 | // Other entries in the PLT for a shared object. | |
463 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
464 | ||
465 | // Set the final size. | |
466 | void | |
27bc2bce | 467 | set_final_data_size() |
a3ad94ed ILT |
468 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
469 | ||
470 | // Write out the PLT data. | |
471 | void | |
472 | do_write(Output_file*); | |
473 | ||
474 | // The reloc section. | |
475 | Reloc_section* rel_; | |
476 | // The .got.plt section. | |
477 | Output_data_space* got_plt_; | |
478 | // The number of PLT entries. | |
479 | unsigned int count_; | |
a3ad94ed ILT |
480 | }; |
481 | ||
482 | // Create the PLT section. The ordinary .got section is an argument, | |
483 | // since we need to refer to the start. We also create our own .got | |
484 | // section just for PLT entries. | |
485 | ||
486 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 487 | Output_data_space* got_plt) |
80576242 | 488 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
489 | { |
490 | this->rel_ = new Reloc_section(); | |
491 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
492 | elfcpp::SHF_ALLOC, this->rel_); | |
493 | } | |
494 | ||
16649710 ILT |
495 | void |
496 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
497 | { | |
498 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
499 | // linker, and so do we. | |
500 | os->set_entsize(4); | |
501 | } | |
502 | ||
a3ad94ed ILT |
503 | // Add an entry to the PLT. |
504 | ||
505 | void | |
506 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
507 | { | |
508 | gold_assert(!gsym->has_plt_offset()); | |
509 | ||
510 | // Note that when setting the PLT offset we skip the initial | |
511 | // reserved PLT entry. | |
512 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
513 | ||
514 | ++this->count_; | |
515 | ||
fe8718a4 | 516 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
517 | |
518 | // Every PLT entry needs a GOT entry which points back to the PLT | |
519 | // entry (this will be changed by the dynamic linker, normally | |
520 | // lazily when the function is called). | |
27bc2bce | 521 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
522 | |
523 | // Every PLT entry needs a reloc. | |
16649710 | 524 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
525 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
526 | got_offset); | |
527 | ||
528 | // Note that we don't need to save the symbol. The contents of the | |
529 | // PLT are independent of which symbols are used. The symbols only | |
530 | // appear in the relocations. | |
531 | } | |
532 | ||
533 | // The first entry in the PLT for an executable. | |
534 | ||
535 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
536 | { | |
537 | 0xff, 0x35, // pushl contents of memory address | |
538 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
539 | 0xff, 0x25, // jmp indirect | |
540 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
541 | 0, 0, 0, 0 // unused | |
542 | }; | |
543 | ||
544 | // The first entry in the PLT for a shared object. | |
545 | ||
546 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
547 | { | |
548 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
549 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
550 | 0, 0, 0, 0 // unused | |
551 | }; | |
552 | ||
553 | // Subsequent entries in the PLT for an executable. | |
554 | ||
555 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
556 | { | |
557 | 0xff, 0x25, // jmp indirect | |
558 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
559 | 0x68, // pushl immediate | |
560 | 0, 0, 0, 0, // replaced with offset into relocation table | |
561 | 0xe9, // jmp relative | |
562 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
563 | }; | |
564 | ||
565 | // Subsequent entries in the PLT for a shared object. | |
566 | ||
567 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
568 | { | |
569 | 0xff, 0xa3, // jmp *offset(%ebx) | |
570 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
571 | 0x68, // pushl immediate | |
572 | 0, 0, 0, 0, // replaced with offset into relocation table | |
573 | 0xe9, // jmp relative | |
574 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
575 | }; | |
576 | ||
577 | // Write out the PLT. This uses the hand-coded instructions above, | |
578 | // and adjusts them as needed. This is all specified by the i386 ELF | |
579 | // Processor Supplement. | |
580 | ||
581 | void | |
582 | Output_data_plt_i386::do_write(Output_file* of) | |
583 | { | |
584 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
585 | const section_size_type oview_size = |
586 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
587 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
588 | ||
589 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
590 | const section_size_type got_size = |
591 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
592 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
593 | got_size); | |
594 | ||
595 | unsigned char* pov = oview; | |
596 | ||
597 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
598 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
599 | ||
7e1edb90 | 600 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
601 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
602 | else | |
603 | { | |
604 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
605 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
606 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
607 | } | |
608 | pov += plt_entry_size; | |
609 | ||
610 | unsigned char* got_pov = got_view; | |
611 | ||
612 | memset(got_pov, 0, 12); | |
613 | got_pov += 12; | |
614 | ||
615 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
616 | ||
617 | unsigned int plt_offset = plt_entry_size; | |
618 | unsigned int plt_rel_offset = 0; | |
619 | unsigned int got_offset = 12; | |
620 | const unsigned int count = this->count_; | |
621 | for (unsigned int i = 0; | |
622 | i < count; | |
623 | ++i, | |
624 | pov += plt_entry_size, | |
625 | got_pov += 4, | |
626 | plt_offset += plt_entry_size, | |
627 | plt_rel_offset += rel_size, | |
628 | got_offset += 4) | |
629 | { | |
630 | // Set and adjust the PLT entry itself. | |
631 | ||
7e1edb90 | 632 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
633 | { |
634 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
635 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
636 | } | |
637 | else | |
638 | { | |
639 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
640 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
641 | (got_address | |
642 | + got_offset)); | |
643 | } | |
644 | ||
645 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
646 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
647 | - (plt_offset + plt_entry_size)); | |
648 | ||
649 | // Set the entry in the GOT. | |
650 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
651 | } | |
652 | ||
fe8718a4 ILT |
653 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
654 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
655 | |
656 | of->write_output_view(offset, oview_size, oview); | |
657 | of->write_output_view(got_file_offset, got_size, got_view); | |
658 | } | |
659 | ||
660 | // Create a PLT entry for a global symbol. | |
661 | ||
662 | void | |
7e1edb90 | 663 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
664 | { |
665 | if (gsym->has_plt_offset()) | |
666 | return; | |
667 | ||
668 | if (this->plt_ == NULL) | |
669 | { | |
670 | // Create the GOT sections first. | |
7e1edb90 | 671 | this->got_section(symtab, layout); |
a3ad94ed | 672 | |
7e1edb90 | 673 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
674 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
675 | (elfcpp::SHF_ALLOC | |
676 | | elfcpp::SHF_EXECINSTR), | |
677 | this->plt_); | |
a3ad94ed ILT |
678 | } |
679 | ||
680 | this->plt_->add_entry(gsym); | |
681 | } | |
682 | ||
94c4710f ILT |
683 | // Create a GOT entry for the TLS module index. |
684 | ||
685 | unsigned int | |
686 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
687 | Sized_relobj<32, false>* object) | |
688 | { | |
689 | if (this->got_mod_index_offset_ == -1U) | |
690 | { | |
691 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
692 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
693 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
694 | unsigned int got_offset = got->add_constant(0); | |
695 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
696 | got_offset); | |
697 | got->add_constant(0); | |
698 | this->got_mod_index_offset_ = got_offset; | |
699 | } | |
700 | return this->got_mod_index_offset_; | |
701 | } | |
702 | ||
a3ad94ed ILT |
703 | // Handle a relocation against a non-function symbol defined in a |
704 | // dynamic object. The traditional way to handle this is to generate | |
705 | // a COPY relocation to copy the variable at runtime from the shared | |
706 | // object into the executable's data segment. However, this is | |
707 | // undesirable in general, as if the size of the object changes in the | |
708 | // dynamic object, the executable will no longer work correctly. If | |
709 | // this relocation is in a writable section, then we can create a | |
710 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
711 | // address at runtime. However, we do not want do that if the | |
712 | // relocation is in a read-only section, as it would prevent the | |
713 | // readonly segment from being shared. And if we have to eventually | |
714 | // generate a COPY reloc, then any dynamic relocations will be | |
715 | // useless. So this means that if this is a writable section, we need | |
716 | // to save the relocation until we see whether we have to create a | |
717 | // COPY relocation for this symbol for any other relocation. | |
718 | ||
719 | void | |
720 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
721 | Symbol_table* symtab, |
722 | Layout* layout, | |
a3ad94ed | 723 | Sized_relobj<32, false>* object, |
4f4c5f80 ILT |
724 | unsigned int data_shndx, |
725 | Output_section* output_section, | |
726 | Symbol* gsym, | |
5a6f7e2d | 727 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 728 | { |
5a6f7e2d ILT |
729 | Sized_symbol<32>* ssym; |
730 | ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym | |
731 | SELECT_SIZE(32)); | |
732 | ||
733 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
734 | data_shndx, ssym)) | |
a3ad94ed ILT |
735 | { |
736 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
737 | // If it turns out that we never need a COPY reloc for this |
738 | // symbol, then we will emit the relocation. | |
739 | if (this->copy_relocs_ == NULL) | |
740 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
4f4c5f80 | 741 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rel); |
a3ad94ed | 742 | } |
5a6f7e2d ILT |
743 | else |
744 | { | |
745 | // Allocate space for this symbol in the .bss section. | |
746 | ||
747 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
748 | ||
749 | // There is no defined way to determine the required alignment | |
750 | // of the symbol. We pick the alignment based on the size. We | |
751 | // set an arbitrary maximum of 256. | |
752 | unsigned int align; | |
753 | for (align = 1; align < 512; align <<= 1) | |
754 | if ((symsize & align) != 0) | |
755 | break; | |
a3ad94ed | 756 | |
5a6f7e2d ILT |
757 | if (this->dynbss_ == NULL) |
758 | { | |
759 | this->dynbss_ = new Output_data_space(align); | |
760 | layout->add_output_section_data(".bss", | |
761 | elfcpp::SHT_NOBITS, | |
762 | (elfcpp::SHF_ALLOC | |
763 | | elfcpp::SHF_WRITE), | |
764 | this->dynbss_); | |
765 | } | |
766 | ||
767 | Output_data_space* dynbss = this->dynbss_; | |
768 | ||
769 | if (align > dynbss->addralign()) | |
770 | dynbss->set_space_alignment(align); | |
771 | ||
fe8718a4 ILT |
772 | section_size_type dynbss_size = |
773 | convert_to_section_size_type(dynbss->current_data_size()); | |
5a6f7e2d | 774 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 775 | section_size_type offset = dynbss_size; |
27bc2bce | 776 | dynbss->set_current_data_size(dynbss_size + symsize); |
5a6f7e2d | 777 | |
9b07f471 | 778 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
5a6f7e2d ILT |
779 | |
780 | // Add the COPY reloc. | |
781 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
782 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
783 | } | |
a3ad94ed ILT |
784 | } |
785 | ||
92e059d8 | 786 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
787 | // symbol. IS_FINAL is true if the final address of this symbol is |
788 | // known at link time. | |
92e059d8 | 789 | |
af6359d5 | 790 | tls::Tls_optimization |
7e1edb90 | 791 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
792 | { |
793 | // If we are generating a shared library, then we can't do anything | |
794 | // in the linker. | |
7e1edb90 | 795 | if (parameters->output_is_shared()) |
af6359d5 | 796 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
797 | |
798 | switch (r_type) | |
799 | { | |
800 | case elfcpp::R_386_TLS_GD: | |
801 | case elfcpp::R_386_TLS_GOTDESC: | |
802 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 803 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
804 | // access. Since we know that we are generating an executable, |
805 | // we can convert this to Initial-Exec. If we also know that | |
806 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 807 | if (is_final) |
af6359d5 ILT |
808 | return tls::TLSOPT_TO_LE; |
809 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
810 | |
811 | case elfcpp::R_386_TLS_LDM: | |
812 | // This is Local-Dynamic, which refers to a local symbol in the | |
813 | // dynamic TLS block. Since we know that we generating an | |
814 | // executable, we can switch to Local-Exec. | |
af6359d5 | 815 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
816 | |
817 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
818 | // Another type of Local-Dynamic relocation. |
819 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
820 | |
821 | case elfcpp::R_386_TLS_IE: | |
822 | case elfcpp::R_386_TLS_GOTIE: | |
823 | case elfcpp::R_386_TLS_IE_32: | |
824 | // These are Initial-Exec relocs which get the thread offset | |
825 | // from the GOT. If we know that we are linking against the | |
826 | // local symbol, we can switch to Local-Exec, which links the | |
827 | // thread offset into the instruction. | |
a3ad94ed | 828 | if (is_final) |
af6359d5 ILT |
829 | return tls::TLSOPT_TO_LE; |
830 | return tls::TLSOPT_NONE; | |
8462ae85 | 831 | |
92e059d8 ILT |
832 | case elfcpp::R_386_TLS_LE: |
833 | case elfcpp::R_386_TLS_LE_32: | |
834 | // When we already have Local-Exec, there is nothing further we | |
835 | // can do. | |
af6359d5 | 836 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
837 | |
838 | default: | |
a3ad94ed | 839 | gold_unreachable(); |
92e059d8 ILT |
840 | } |
841 | } | |
842 | ||
af6359d5 ILT |
843 | // Report an unsupported relocation against a local symbol. |
844 | ||
845 | void | |
846 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
847 | unsigned int r_type) | |
848 | { | |
75f2446e ILT |
849 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
850 | object->name().c_str(), r_type); | |
af6359d5 ILT |
851 | } |
852 | ||
92e059d8 ILT |
853 | // Scan a relocation for a local symbol. |
854 | ||
855 | inline void | |
7e1edb90 | 856 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
857 | Symbol_table* symtab, |
858 | Layout* layout, | |
859 | Target_i386* target, | |
f6ce93d6 | 860 | Sized_relobj<32, false>* object, |
1b64748b | 861 | unsigned int data_shndx, |
07f397ab | 862 | Output_section* output_section, |
1b64748b | 863 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 864 | unsigned int r_type, |
7bf1f802 | 865 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
866 | { |
867 | switch (r_type) | |
868 | { | |
869 | case elfcpp::R_386_NONE: | |
870 | case elfcpp::R_386_GNU_VTINHERIT: | |
871 | case elfcpp::R_386_GNU_VTENTRY: | |
872 | break; | |
873 | ||
874 | case elfcpp::R_386_32: | |
436ca963 ILT |
875 | // If building a shared library (or a position-independent |
876 | // executable), we need to create a dynamic relocation for | |
877 | // this location. The relocation applied at link time will | |
878 | // apply the link-time value, so we flag the location with | |
879 | // an R_386_RELATIVE relocation so the dynamic loader can | |
880 | // relocate it easily. | |
881 | if (parameters->output_is_position_independent()) | |
882 | { | |
883 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
884 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
885 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
886 | output_section, data_shndx, | |
887 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
888 | } |
889 | break; | |
890 | ||
891 | case elfcpp::R_386_16: | |
892 | case elfcpp::R_386_8: | |
893 | // If building a shared library (or a position-independent | |
894 | // executable), we need to create a dynamic relocation for | |
895 | // this location. Because the addend needs to remain in the | |
896 | // data section, we need to be careful not to apply this | |
897 | // relocation statically. | |
898 | if (parameters->output_is_position_independent()) | |
899 | { | |
900 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
dceae3c1 ILT |
901 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
902 | { | |
903 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
904 | rel_dyn->add_local(object, r_sym, r_type, output_section, | |
905 | data_shndx, reloc.get_r_offset()); | |
906 | } | |
907 | else | |
908 | { | |
909 | gold_assert(lsym.get_st_value() == 0); | |
910 | rel_dyn->add_local_section(object, lsym.get_st_shndx(), | |
911 | r_type, output_section, | |
912 | data_shndx, reloc.get_r_offset()); | |
913 | } | |
436ca963 | 914 | } |
92e059d8 ILT |
915 | break; |
916 | ||
917 | case elfcpp::R_386_PC32: | |
918 | case elfcpp::R_386_PC16: | |
919 | case elfcpp::R_386_PC8: | |
920 | break; | |
921 | ||
df2efe71 ILT |
922 | case elfcpp::R_386_PLT32: |
923 | // Since we know this is a local symbol, we can handle this as a | |
924 | // PC32 reloc. | |
925 | break; | |
926 | ||
ead1e424 ILT |
927 | case elfcpp::R_386_GOTOFF: |
928 | case elfcpp::R_386_GOTPC: | |
929 | // We need a GOT section. | |
7e1edb90 | 930 | target->got_section(symtab, layout); |
ead1e424 ILT |
931 | break; |
932 | ||
1b64748b ILT |
933 | case elfcpp::R_386_GOT32: |
934 | { | |
935 | // The symbol requires a GOT entry. | |
936 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
937 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
938 | if (got->add_local(object, r_sym)) | |
939 | { | |
940 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 941 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
436ca963 | 942 | if (parameters->output_is_position_independent()) |
1b64748b ILT |
943 | { |
944 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
945 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
946 | rel_dyn->add_local_relative(object, r_sym, | |
947 | elfcpp::R_386_RELATIVE, | |
948 | got, | |
949 | object->local_got_offset(r_sym)); | |
1b64748b ILT |
950 | } |
951 | } | |
952 | } | |
953 | break; | |
954 | ||
af6359d5 ILT |
955 | // These are relocations which should only be seen by the |
956 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
957 | case elfcpp::R_386_COPY: |
958 | case elfcpp::R_386_GLOB_DAT: | |
959 | case elfcpp::R_386_JUMP_SLOT: | |
960 | case elfcpp::R_386_RELATIVE: | |
961 | case elfcpp::R_386_TLS_TPOFF: | |
962 | case elfcpp::R_386_TLS_DTPMOD32: | |
963 | case elfcpp::R_386_TLS_DTPOFF32: | |
964 | case elfcpp::R_386_TLS_TPOFF32: | |
965 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 966 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 967 | object->name().c_str(), r_type); |
92e059d8 ILT |
968 | break; |
969 | ||
af6359d5 | 970 | // These are initial TLS relocs, which are expected when |
d61c17ea | 971 | // linking. |
56622147 ILT |
972 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
973 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
974 | case elfcpp::R_386_TLS_DESC_CALL: | |
975 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
976 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
977 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 978 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
979 | case elfcpp::R_386_TLS_GOTIE: |
980 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 981 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 982 | { |
80576242 | 983 | bool output_is_shared = parameters->output_is_shared(); |
af6359d5 ILT |
984 | const tls::Tls_optimization optimized_type |
985 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
986 | switch (r_type) |
987 | { | |
56622147 | 988 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
989 | if (optimized_type == tls::TLSOPT_NONE) |
990 | { | |
991 | // Create a pair of GOT entries for the module index and | |
992 | // dtv-relative offset. | |
993 | Output_data_got<32, false>* got | |
994 | = target->got_section(symtab, layout); | |
995 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
996 | got->add_local_tls_with_rel(object, r_sym, |
997 | lsym.get_st_shndx(), true, | |
998 | target->rel_dyn_section(layout), | |
999 | elfcpp::R_386_TLS_DTPMOD32); | |
07f397ab ILT |
1000 | } |
1001 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1002 | unsupported_reloc_local(object, r_type); | |
1003 | break; | |
1004 | ||
56622147 ILT |
1005 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
1006 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
1007 | // FIXME: If not relaxing to LE, we need to generate |
1008 | // a GOT entry with an R_386_TLS_DESC reloc. | |
1009 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1010 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1011 | break; |
1012 | ||
56622147 | 1013 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1014 | if (optimized_type == tls::TLSOPT_NONE) |
1015 | { | |
1016 | // Create a GOT entry for the module index. | |
94c4710f | 1017 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1018 | } |
1019 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1020 | unsupported_reloc_local(object, r_type); |
1021 | break; | |
1022 | ||
56622147 | 1023 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1024 | break; |
1025 | ||
56622147 ILT |
1026 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1027 | case elfcpp::R_386_TLS_IE_32: | |
1028 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1029 | layout->set_has_static_tls(); |
07f397ab ILT |
1030 | if (optimized_type == tls::TLSOPT_NONE) |
1031 | { | |
7bf1f802 ILT |
1032 | // For the R_386_TLS_IE relocation, we need to create a |
1033 | // dynamic relocation when building a shared library. | |
1034 | if (r_type == elfcpp::R_386_TLS_IE | |
1035 | && parameters->output_is_shared()) | |
1036 | { | |
1037 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1038 | unsigned int r_sym |
1039 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1040 | rel_dyn->add_local_relative(object, r_sym, | |
1041 | elfcpp::R_386_RELATIVE, | |
1042 | output_section, data_shndx, | |
1043 | reloc.get_r_offset()); | |
7bf1f802 | 1044 | } |
07f397ab ILT |
1045 | // Create a GOT entry for the tp-relative offset. |
1046 | Output_data_got<32, false>* got | |
1047 | = target->got_section(symtab, layout); | |
1048 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1049 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1050 | ? elfcpp::R_386_TLS_TPOFF32 | |
1051 | : elfcpp::R_386_TLS_TPOFF); | |
1052 | got->add_local_with_rel(object, r_sym, | |
1053 | target->rel_dyn_section(layout), | |
1054 | dyn_r_type); | |
07f397ab ILT |
1055 | } |
1056 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1057 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1058 | break; |
af6359d5 | 1059 | |
56622147 ILT |
1060 | case elfcpp::R_386_TLS_LE: // Local-exec |
1061 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1062 | layout->set_has_static_tls(); |
07f397ab | 1063 | if (output_is_shared) |
7bf1f802 ILT |
1064 | { |
1065 | // We need to create a dynamic relocation. | |
dceae3c1 | 1066 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1067 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1068 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1069 | ? elfcpp::R_386_TLS_TPOFF32 | |
1070 | : elfcpp::R_386_TLS_TPOFF); | |
1071 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1072 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1073 | data_shndx, reloc.get_r_offset()); | |
1074 | } | |
56622147 ILT |
1075 | break; |
1076 | ||
af6359d5 ILT |
1077 | default: |
1078 | gold_unreachable(); | |
7e1edb90 ILT |
1079 | } |
1080 | } | |
92e059d8 ILT |
1081 | break; |
1082 | ||
92e059d8 ILT |
1083 | case elfcpp::R_386_32PLT: |
1084 | case elfcpp::R_386_TLS_GD_32: | |
1085 | case elfcpp::R_386_TLS_GD_PUSH: | |
1086 | case elfcpp::R_386_TLS_GD_CALL: | |
1087 | case elfcpp::R_386_TLS_GD_POP: | |
1088 | case elfcpp::R_386_TLS_LDM_32: | |
1089 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1090 | case elfcpp::R_386_TLS_LDM_CALL: | |
1091 | case elfcpp::R_386_TLS_LDM_POP: | |
1092 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1093 | default: | |
af6359d5 | 1094 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1095 | break; |
1096 | } | |
1097 | } | |
1098 | ||
af6359d5 ILT |
1099 | // Report an unsupported relocation against a global symbol. |
1100 | ||
1101 | void | |
1102 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1103 | unsigned int r_type, | |
1104 | Symbol* gsym) | |
1105 | { | |
75f2446e | 1106 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1107 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1108 | } |
1109 | ||
92e059d8 ILT |
1110 | // Scan a relocation for a global symbol. |
1111 | ||
1112 | inline void | |
1113 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
1114 | Symbol_table* symtab, |
1115 | Layout* layout, | |
1116 | Target_i386* target, | |
f6ce93d6 | 1117 | Sized_relobj<32, false>* object, |
a3ad94ed | 1118 | unsigned int data_shndx, |
07f397ab | 1119 | Output_section* output_section, |
a3ad94ed ILT |
1120 | const elfcpp::Rel<32, false>& reloc, |
1121 | unsigned int r_type, | |
92e059d8 ILT |
1122 | Symbol* gsym) |
1123 | { | |
1124 | switch (r_type) | |
1125 | { | |
1126 | case elfcpp::R_386_NONE: | |
1127 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1128 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1129 | break; |
1130 | ||
1131 | case elfcpp::R_386_32: | |
92e059d8 | 1132 | case elfcpp::R_386_16: |
92e059d8 | 1133 | case elfcpp::R_386_8: |
96f2030e | 1134 | { |
d61c6bd4 ILT |
1135 | // Make a PLT entry if necessary. |
1136 | if (gsym->needs_plt_entry()) | |
1137 | { | |
1138 | target->make_plt_entry(symtab, layout, gsym); | |
1139 | // Since this is not a PC-relative relocation, we may be | |
1140 | // taking the address of a function. In that case we need to | |
1141 | // set the entry in the dynamic symbol table to the address of | |
1142 | // the PLT entry. | |
03e8f2b2 | 1143 | if (gsym->is_from_dynobj() && !parameters->output_is_shared()) |
d61c6bd4 ILT |
1144 | gsym->set_needs_dynsym_value(); |
1145 | } | |
1146 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1147 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1148 | { |
1149 | if (target->may_need_copy_reloc(gsym)) | |
1150 | { | |
07f397ab | 1151 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1152 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1153 | } |
1154 | else if (r_type == elfcpp::R_386_32 | |
1155 | && gsym->can_use_relative_reloc(false)) | |
1156 | { | |
1157 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1158 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1159 | output_section, object, | |
1160 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1161 | } |
1162 | else | |
1163 | { | |
96f2030e | 1164 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1165 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1166 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1167 | } |
1168 | } | |
1169 | } | |
1170 | break; | |
1171 | ||
1172 | case elfcpp::R_386_PC32: | |
1173 | case elfcpp::R_386_PC16: | |
1174 | case elfcpp::R_386_PC8: | |
1175 | { | |
1176 | // Make a PLT entry if necessary. | |
1177 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1178 | { |
1179 | // These relocations are used for function calls only in | |
1180 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1181 | // we'll need a text relocation anyway, so we can skip the | |
1182 | // PLT entry and let the dynamic linker bind the call directly | |
1183 | // to the target. For smaller relocations, we should use a | |
1184 | // PLT entry to ensure that the call can reach. | |
1185 | if (!parameters->output_is_shared() | |
1186 | || r_type != elfcpp::R_386_PC32) | |
1187 | target->make_plt_entry(symtab, layout, gsym); | |
1188 | } | |
d61c6bd4 | 1189 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1190 | int flags = Symbol::NON_PIC_REF; |
1191 | if (gsym->type() == elfcpp::STT_FUNC) | |
1192 | flags |= Symbol::FUNCTION_CALL; | |
1193 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1194 | { |
d61c6bd4 ILT |
1195 | if (target->may_need_copy_reloc(gsym)) |
1196 | { | |
07f397ab | 1197 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1198 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1199 | } |
86849f1f | 1200 | else |
d61c6bd4 ILT |
1201 | { |
1202 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1203 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1204 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1205 | } |
96f2030e ILT |
1206 | } |
1207 | } | |
92e059d8 ILT |
1208 | break; |
1209 | ||
ead1e424 | 1210 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1211 | { |
1212 | // The symbol requires a GOT entry. | |
7e1edb90 | 1213 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 ILT |
1214 | if (gsym->final_value_is_known()) |
1215 | got->add_global(gsym); | |
1216 | else | |
1217 | { | |
8462ae85 | 1218 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1219 | // GOT entry with a dynamic relocation. |
1220 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1221 | if (gsym->is_from_dynobj() |
1222 | || gsym->is_undefined() | |
1223 | || gsym->is_preemptible()) | |
7bf1f802 ILT |
1224 | got->add_global_with_rel(gsym, rel_dyn, elfcpp::R_386_GLOB_DAT); |
1225 | else | |
8462ae85 | 1226 | { |
7bf1f802 | 1227 | if (got->add_global(gsym)) |
e8c846c3 ILT |
1228 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1229 | got, gsym->got_offset()); | |
8462ae85 ILT |
1230 | } |
1231 | } | |
1232 | } | |
ead1e424 ILT |
1233 | break; |
1234 | ||
1235 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1236 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1237 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1238 | if (gsym->final_value_is_known()) |
ead1e424 | 1239 | break; |
436ca963 ILT |
1240 | // If building a shared library, we can also skip the PLT entry |
1241 | // if the symbol is defined in the output file and is protected | |
1242 | // or hidden. | |
1243 | if (gsym->is_defined() | |
1244 | && !gsym->is_from_dynobj() | |
1245 | && !gsym->is_preemptible()) | |
1246 | break; | |
7e1edb90 | 1247 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1248 | break; |
1249 | ||
1250 | case elfcpp::R_386_GOTOFF: | |
1251 | case elfcpp::R_386_GOTPC: | |
1252 | // We need a GOT section. | |
7e1edb90 | 1253 | target->got_section(symtab, layout); |
ead1e424 ILT |
1254 | break; |
1255 | ||
af6359d5 ILT |
1256 | // These are relocations which should only be seen by the |
1257 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1258 | case elfcpp::R_386_COPY: |
1259 | case elfcpp::R_386_GLOB_DAT: | |
1260 | case elfcpp::R_386_JUMP_SLOT: | |
1261 | case elfcpp::R_386_RELATIVE: | |
1262 | case elfcpp::R_386_TLS_TPOFF: | |
1263 | case elfcpp::R_386_TLS_DTPMOD32: | |
1264 | case elfcpp::R_386_TLS_DTPOFF32: | |
1265 | case elfcpp::R_386_TLS_TPOFF32: | |
1266 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1267 | gold_error(_("%s: unexpected reloc %u in object file"), |
1268 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1269 | break; |
1270 | ||
d61c17ea ILT |
1271 | // These are initial tls relocs, which are expected when |
1272 | // linking. | |
56622147 ILT |
1273 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1274 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1275 | case elfcpp::R_386_TLS_DESC_CALL: | |
1276 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1277 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1278 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1279 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1280 | case elfcpp::R_386_TLS_GOTIE: |
1281 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1282 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1283 | { |
7e1edb90 | 1284 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1285 | const tls::Tls_optimization optimized_type |
1286 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1287 | switch (r_type) |
1288 | { | |
56622147 | 1289 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1290 | if (optimized_type == tls::TLSOPT_NONE) |
1291 | { | |
1292 | // Create a pair of GOT entries for the module index and | |
1293 | // dtv-relative offset. | |
1294 | Output_data_got<32, false>* got | |
1295 | = target->got_section(symtab, layout); | |
7bf1f802 ILT |
1296 | got->add_global_tls_with_rel(gsym, |
1297 | target->rel_dyn_section(layout), | |
1298 | elfcpp::R_386_TLS_DTPMOD32, | |
1299 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1300 | } |
1301 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1302 | { | |
1303 | // Create a GOT entry for the tp-relative offset. | |
1304 | Output_data_got<32, false>* got | |
1305 | = target->got_section(symtab, layout); | |
7bf1f802 ILT |
1306 | got->add_global_with_rel(gsym, target->rel_dyn_section(layout), |
1307 | elfcpp::R_386_TLS_TPOFF32); | |
07f397ab ILT |
1308 | } |
1309 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1310 | unsupported_reloc_global(object, r_type, gsym); | |
1311 | break; | |
1312 | ||
56622147 ILT |
1313 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
1314 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
1315 | // FIXME: If not relaxing to LE, we need to generate |
1316 | // a GOT entry with an R_386_TLS_DESC reloc. | |
1317 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1318 | unsupported_reloc_global(object, r_type, gsym); | |
07f397ab | 1319 | unsupported_reloc_global(object, r_type, gsym); |
af6359d5 ILT |
1320 | break; |
1321 | ||
56622147 | 1322 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1323 | if (optimized_type == tls::TLSOPT_NONE) |
1324 | { | |
1325 | // Create a GOT entry for the module index. | |
94c4710f | 1326 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1327 | } |
1328 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1329 | unsupported_reloc_global(object, r_type, gsym); |
1330 | break; | |
1331 | ||
56622147 | 1332 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1333 | break; |
1334 | ||
56622147 ILT |
1335 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1336 | case elfcpp::R_386_TLS_IE_32: | |
1337 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1338 | layout->set_has_static_tls(); |
07f397ab ILT |
1339 | if (optimized_type == tls::TLSOPT_NONE) |
1340 | { | |
7bf1f802 ILT |
1341 | // For the R_386_TLS_IE relocation, we need to create a |
1342 | // dynamic relocation when building a shared library. | |
1343 | if (r_type == elfcpp::R_386_TLS_IE | |
1344 | && parameters->output_is_shared()) | |
07f397ab | 1345 | { |
07f397ab | 1346 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1347 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1348 | output_section, object, | |
1349 | data_shndx, | |
1350 | reloc.get_r_offset()); | |
07f397ab | 1351 | } |
7bf1f802 ILT |
1352 | // Create a GOT entry for the tp-relative offset. |
1353 | Output_data_got<32, false>* got | |
1354 | = target->got_section(symtab, layout); | |
1355 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1356 | ? elfcpp::R_386_TLS_TPOFF32 | |
1357 | : elfcpp::R_386_TLS_TPOFF); | |
1358 | got->add_global_with_rel(gsym, | |
1359 | target->rel_dyn_section(layout), | |
1360 | dyn_r_type); | |
07f397ab ILT |
1361 | } |
1362 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1363 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1364 | break; |
af6359d5 | 1365 | |
56622147 ILT |
1366 | case elfcpp::R_386_TLS_LE: // Local-exec |
1367 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1368 | layout->set_has_static_tls(); |
07f397ab | 1369 | if (parameters->output_is_shared()) |
7bf1f802 ILT |
1370 | { |
1371 | // We need to create a dynamic relocation. | |
1372 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1373 | ? elfcpp::R_386_TLS_TPOFF32 | |
1374 | : elfcpp::R_386_TLS_TPOFF); | |
1375 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1376 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1377 | data_shndx, reloc.get_r_offset()); | |
1378 | } | |
56622147 ILT |
1379 | break; |
1380 | ||
af6359d5 ILT |
1381 | default: |
1382 | gold_unreachable(); | |
a3ad94ed ILT |
1383 | } |
1384 | } | |
92e059d8 ILT |
1385 | break; |
1386 | ||
92e059d8 ILT |
1387 | case elfcpp::R_386_32PLT: |
1388 | case elfcpp::R_386_TLS_GD_32: | |
1389 | case elfcpp::R_386_TLS_GD_PUSH: | |
1390 | case elfcpp::R_386_TLS_GD_CALL: | |
1391 | case elfcpp::R_386_TLS_GD_POP: | |
1392 | case elfcpp::R_386_TLS_LDM_32: | |
1393 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1394 | case elfcpp::R_386_TLS_LDM_CALL: | |
1395 | case elfcpp::R_386_TLS_LDM_POP: | |
1396 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1397 | default: | |
af6359d5 | 1398 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1399 | break; |
1400 | } | |
1401 | } | |
1402 | ||
1403 | // Scan relocations for a section. | |
1404 | ||
1405 | void | |
1406 | Target_i386::scan_relocs(const General_options& options, | |
1407 | Symbol_table* symtab, | |
ead1e424 | 1408 | Layout* layout, |
f6ce93d6 | 1409 | Sized_relobj<32, false>* object, |
a3ad94ed | 1410 | unsigned int data_shndx, |
92e059d8 ILT |
1411 | unsigned int sh_type, |
1412 | const unsigned char* prelocs, | |
1413 | size_t reloc_count, | |
730cdc88 ILT |
1414 | Output_section* output_section, |
1415 | bool needs_special_offset_handling, | |
92e059d8 | 1416 | size_t local_symbol_count, |
730cdc88 | 1417 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1418 | { |
1419 | if (sh_type == elfcpp::SHT_RELA) | |
1420 | { | |
75f2446e ILT |
1421 | gold_error(_("%s: unsupported RELA reloc section"), |
1422 | object->name().c_str()); | |
1423 | return; | |
92e059d8 ILT |
1424 | } |
1425 | ||
ead1e424 ILT |
1426 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1427 | Target_i386::Scan>( | |
92e059d8 ILT |
1428 | options, |
1429 | symtab, | |
ead1e424 ILT |
1430 | layout, |
1431 | this, | |
92e059d8 | 1432 | object, |
a3ad94ed | 1433 | data_shndx, |
92e059d8 ILT |
1434 | prelocs, |
1435 | reloc_count, | |
730cdc88 ILT |
1436 | output_section, |
1437 | needs_special_offset_handling, | |
92e059d8 | 1438 | local_symbol_count, |
730cdc88 | 1439 | plocal_symbols); |
92e059d8 ILT |
1440 | } |
1441 | ||
16649710 | 1442 | // Finalize the sections. |
5a6f7e2d ILT |
1443 | |
1444 | void | |
7e1edb90 | 1445 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1446 | { |
16649710 ILT |
1447 | // Fill in some more dynamic tags. |
1448 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1449 | if (odyn != NULL) | |
1450 | { | |
1451 | if (this->got_plt_ != NULL) | |
1452 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1453 | ||
1454 | if (this->plt_ != NULL) | |
1455 | { | |
1456 | const Output_data* od = this->plt_->rel_plt(); | |
1457 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1458 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1459 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1460 | } | |
1461 | ||
1462 | if (this->rel_dyn_ != NULL) | |
1463 | { | |
1464 | const Output_data* od = this->rel_dyn_; | |
1465 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1466 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1467 | odyn->add_constant(elfcpp::DT_RELENT, | |
1468 | elfcpp::Elf_sizes<32>::rel_size); | |
1469 | } | |
1470 | ||
7e1edb90 | 1471 | if (!parameters->output_is_shared()) |
16649710 ILT |
1472 | { |
1473 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1474 | // linker at run time, and used by the debugger. | |
1475 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1480 | // relocs. | |
5a6f7e2d ILT |
1481 | if (this->copy_relocs_ == NULL) |
1482 | return; | |
1483 | if (this->copy_relocs_->any_to_emit()) | |
1484 | { | |
1485 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1486 | this->copy_relocs_->emit(rel_dyn); | |
1487 | } | |
1488 | delete this->copy_relocs_; | |
1489 | this->copy_relocs_ = NULL; | |
1490 | } | |
1491 | ||
86849f1f ILT |
1492 | // Return whether a direct absolute static relocation needs to be applied. |
1493 | // In cases where Scan::local() or Scan::global() has created | |
1494 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1495 | // of the relocation is carried in the data, and we must not | |
1496 | // apply the static relocation. | |
1497 | ||
1498 | inline bool | |
1499 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1500 | int ref_flags, |
86849f1f ILT |
1501 | bool is_32bit) |
1502 | { | |
d61c6bd4 ILT |
1503 | // For local symbols, we will have created a non-RELATIVE dynamic |
1504 | // relocation only if (a) the output is position independent, | |
1505 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1506 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1507 | if (gsym == NULL) |
d61c6bd4 | 1508 | return !(parameters->output_is_position_independent() |
0700cf32 | 1509 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1510 | && !is_32bit); |
86849f1f | 1511 | |
0700cf32 ILT |
1512 | // For global symbols, we use the same helper routines used in the |
1513 | // scan pass. If we did not create a dynamic relocation, or if we | |
1514 | // created a RELATIVE dynamic relocation, we should apply the static | |
1515 | // relocation. | |
1516 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1517 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1518 | && gsym->can_use_relative_reloc(ref_flags | |
1519 | & Symbol::FUNCTION_CALL); | |
1520 | return !has_dyn || is_rel; | |
86849f1f ILT |
1521 | } |
1522 | ||
61ba1cf9 ILT |
1523 | // Perform a relocation. |
1524 | ||
ead1e424 | 1525 | inline bool |
92e059d8 | 1526 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1527 | Target_i386* target, |
92e059d8 ILT |
1528 | size_t relnum, |
1529 | const elfcpp::Rel<32, false>& rel, | |
1530 | unsigned int r_type, | |
c06b7b0b | 1531 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1532 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1533 | unsigned char* view, |
1534 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1535 | section_size_type view_size) |
61ba1cf9 | 1536 | { |
ead1e424 ILT |
1537 | if (this->skip_call_tls_get_addr_) |
1538 | { | |
1539 | if (r_type != elfcpp::R_386_PLT32 | |
1540 | || gsym == NULL | |
1541 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1542 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1543 | _("missing expected TLS relocation")); | |
1544 | else | |
ead1e424 | 1545 | { |
75f2446e ILT |
1546 | this->skip_call_tls_get_addr_ = false; |
1547 | return false; | |
ead1e424 | 1548 | } |
ead1e424 ILT |
1549 | } |
1550 | ||
a3ad94ed | 1551 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1552 | Symbol_value<32> symval; |
0700cf32 ILT |
1553 | bool is_nonpic = (r_type == elfcpp::R_386_PC8 |
1554 | || r_type == elfcpp::R_386_PC16 | |
1555 | || r_type == elfcpp::R_386_PC32); | |
436ca963 ILT |
1556 | if (gsym != NULL |
1557 | && (gsym->is_from_dynobj() | |
1558 | || (parameters->output_is_shared() | |
8fc19601 | 1559 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
0700cf32 ILT |
1560 | && gsym->has_plt_offset() |
1561 | && (!is_nonpic || !parameters->output_is_shared())) | |
a3ad94ed | 1562 | { |
b8e6aad9 ILT |
1563 | symval.set_output_value(target->plt_section()->address() |
1564 | + gsym->plt_offset()); | |
1565 | psymval = &symval; | |
a3ad94ed ILT |
1566 | } |
1567 | ||
b8e6aad9 ILT |
1568 | const Sized_relobj<32, false>* object = relinfo->object; |
1569 | ||
1b64748b | 1570 | // Get the GOT offset if needed. |
96f2030e ILT |
1571 | // The GOT pointer points to the end of the GOT section. |
1572 | // We need to subtract the size of the GOT section to get | |
1573 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1574 | bool have_got_offset = false; |
1575 | unsigned int got_offset = 0; | |
1576 | switch (r_type) | |
1577 | { | |
1578 | case elfcpp::R_386_GOT32: | |
1579 | if (gsym != NULL) | |
1580 | { | |
1581 | gold_assert(gsym->has_got_offset()); | |
96f2030e | 1582 | got_offset = gsym->got_offset() - target->got_size(); |
1b64748b ILT |
1583 | } |
1584 | else | |
1585 | { | |
1586 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
07f397ab | 1587 | gold_assert(object->local_has_got_offset(r_sym)); |
96f2030e | 1588 | got_offset = object->local_got_offset(r_sym) - target->got_size(); |
1b64748b ILT |
1589 | } |
1590 | have_got_offset = true; | |
1591 | break; | |
1592 | ||
1593 | default: | |
1594 | break; | |
1595 | } | |
1596 | ||
61ba1cf9 ILT |
1597 | switch (r_type) |
1598 | { | |
1599 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1600 | case elfcpp::R_386_GNU_VTINHERIT: |
1601 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1602 | break; |
1603 | ||
1604 | case elfcpp::R_386_32: | |
0700cf32 | 1605 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true)) |
86849f1f | 1606 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1607 | break; |
1608 | ||
1609 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1610 | { |
0700cf32 ILT |
1611 | int ref_flags = Symbol::NON_PIC_REF; |
1612 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1613 | ref_flags |= Symbol::FUNCTION_CALL; | |
1614 | if (should_apply_static_reloc(gsym, ref_flags, true)) | |
d61c6bd4 ILT |
1615 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1616 | } | |
92e059d8 ILT |
1617 | break; |
1618 | ||
1619 | case elfcpp::R_386_16: | |
0700cf32 | 1620 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1621 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1622 | break; |
1623 | ||
1624 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1625 | { |
0700cf32 ILT |
1626 | int ref_flags = Symbol::NON_PIC_REF; |
1627 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1628 | ref_flags |= Symbol::FUNCTION_CALL; | |
1629 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1630 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1631 | } | |
61ba1cf9 ILT |
1632 | break; |
1633 | ||
92e059d8 | 1634 | case elfcpp::R_386_8: |
0700cf32 | 1635 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1636 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1637 | break; |
1638 | ||
1639 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1640 | { |
0700cf32 ILT |
1641 | int ref_flags = Symbol::NON_PIC_REF; |
1642 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1643 | ref_flags |= Symbol::FUNCTION_CALL; | |
1644 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1645 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1646 | } | |
92e059d8 ILT |
1647 | break; |
1648 | ||
ead1e424 | 1649 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1650 | gold_assert(gsym == NULL |
1651 | || gsym->has_plt_offset() | |
99f8faca ILT |
1652 | || gsym->final_value_is_known() |
1653 | || (gsym->is_defined() | |
1654 | && !gsym->is_from_dynobj() | |
1655 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1656 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1657 | break; |
1658 | ||
1659 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1660 | gold_assert(have_got_offset); |
1661 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1662 | break; |
1663 | ||
1664 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1665 | { |
1666 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1667 | value = (psymval->value(object, 0) | |
96f2030e | 1668 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1669 | Relocate_functions<32, false>::rel32(view, value); |
1670 | } | |
ead1e424 ILT |
1671 | break; |
1672 | ||
1673 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1674 | { |
1675 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1676 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1677 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1678 | } | |
ead1e424 ILT |
1679 | break; |
1680 | ||
92e059d8 ILT |
1681 | case elfcpp::R_386_COPY: |
1682 | case elfcpp::R_386_GLOB_DAT: | |
1683 | case elfcpp::R_386_JUMP_SLOT: | |
1684 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1685 | // These are outstanding tls relocs, which are unexpected when |
1686 | // linking. | |
92e059d8 ILT |
1687 | case elfcpp::R_386_TLS_TPOFF: |
1688 | case elfcpp::R_386_TLS_DTPMOD32: | |
1689 | case elfcpp::R_386_TLS_DTPOFF32: | |
1690 | case elfcpp::R_386_TLS_TPOFF32: | |
1691 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1692 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1693 | _("unexpected reloc %u in object file"), | |
1694 | r_type); | |
92e059d8 ILT |
1695 | break; |
1696 | ||
d61c17ea ILT |
1697 | // These are initial tls relocs, which are expected when |
1698 | // linking. | |
56622147 ILT |
1699 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1700 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1701 | case elfcpp::R_386_TLS_DESC_CALL: | |
1702 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1703 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1704 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1705 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1706 | case elfcpp::R_386_TLS_GOTIE: |
1707 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1708 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1709 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1710 | view, address, view_size); | |
92e059d8 ILT |
1711 | break; |
1712 | ||
92e059d8 ILT |
1713 | case elfcpp::R_386_32PLT: |
1714 | case elfcpp::R_386_TLS_GD_32: | |
1715 | case elfcpp::R_386_TLS_GD_PUSH: | |
1716 | case elfcpp::R_386_TLS_GD_CALL: | |
1717 | case elfcpp::R_386_TLS_GD_POP: | |
1718 | case elfcpp::R_386_TLS_LDM_32: | |
1719 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1720 | case elfcpp::R_386_TLS_LDM_CALL: | |
1721 | case elfcpp::R_386_TLS_LDM_POP: | |
1722 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1723 | default: |
75f2446e ILT |
1724 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1725 | _("unsupported reloc %u"), | |
1726 | r_type); | |
92e059d8 ILT |
1727 | break; |
1728 | } | |
ead1e424 ILT |
1729 | |
1730 | return true; | |
92e059d8 ILT |
1731 | } |
1732 | ||
1733 | // Perform a TLS relocation. | |
1734 | ||
1735 | inline void | |
1736 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1737 | Target_i386* target, |
92e059d8 ILT |
1738 | size_t relnum, |
1739 | const elfcpp::Rel<32, false>& rel, | |
1740 | unsigned int r_type, | |
c06b7b0b | 1741 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1742 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1743 | unsigned char* view, |
1744 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1745 | section_size_type view_size) |
92e059d8 ILT |
1746 | { |
1747 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1748 | |
07f397ab ILT |
1749 | const Sized_relobj<32, false>* object = relinfo->object; |
1750 | ||
1751 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1752 | |
a3ad94ed | 1753 | const bool is_final = (gsym == NULL |
436ca963 | 1754 | ? !parameters->output_is_position_independent() |
7e1edb90 | 1755 | : gsym->final_value_is_known()); |
af6359d5 ILT |
1756 | const tls::Tls_optimization optimized_type |
1757 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1758 | switch (r_type) |
1759 | { | |
56622147 | 1760 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1761 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1762 | { |
07f397ab | 1763 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1764 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1765 | rel, r_type, value, view, | |
1766 | view_size); | |
92e059d8 ILT |
1767 | break; |
1768 | } | |
07f397ab ILT |
1769 | else |
1770 | { | |
1771 | unsigned int got_offset; | |
1772 | if (gsym != NULL) | |
1773 | { | |
1774 | gold_assert(gsym->has_tls_got_offset(true)); | |
1775 | got_offset = gsym->tls_got_offset(true) - target->got_size(); | |
1776 | } | |
1777 | else | |
1778 | { | |
1779 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1780 | gold_assert(object->local_has_tls_got_offset(r_sym, true)); | |
1781 | got_offset = (object->local_tls_got_offset(r_sym, true) | |
1782 | - target->got_size()); | |
1783 | } | |
1784 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1785 | { | |
1786 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1787 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1788 | got_offset, view, view_size); | |
07f397ab ILT |
1789 | break; |
1790 | } | |
1791 | else if (optimized_type == tls::TLSOPT_NONE) | |
1792 | { | |
1793 | // Relocate the field with the offset of the pair of GOT | |
1794 | // entries. | |
1795 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1796 | break; | |
1797 | } | |
1798 | } | |
75f2446e ILT |
1799 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1800 | _("unsupported reloc %u"), | |
1801 | r_type); | |
92e059d8 ILT |
1802 | break; |
1803 | ||
56622147 ILT |
1804 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1805 | case elfcpp::R_386_TLS_DESC_CALL: | |
75f2446e ILT |
1806 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1807 | _("unsupported reloc %u"), | |
1808 | r_type); | |
ead1e424 ILT |
1809 | break; |
1810 | ||
56622147 | 1811 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1812 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1813 | { | |
75f2446e ILT |
1814 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1815 | _("both SUN and GNU model " | |
1816 | "TLS relocations")); | |
1817 | break; | |
46cf9fa2 ILT |
1818 | } |
1819 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1820 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1821 | { |
07f397ab | 1822 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1823 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1824 | value, view, view_size); | |
1825 | break; | |
1826 | } | |
07f397ab ILT |
1827 | else if (optimized_type == tls::TLSOPT_NONE) |
1828 | { | |
1829 | // Relocate the field with the offset of the GOT entry for | |
1830 | // the module index. | |
1831 | unsigned int got_offset; | |
94c4710f ILT |
1832 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1833 | - target->got_size()); | |
07f397ab ILT |
1834 | Relocate_functions<32, false>::rel32(view, got_offset); |
1835 | break; | |
1836 | } | |
75f2446e ILT |
1837 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1838 | _("unsupported reloc %u"), | |
1839 | r_type); | |
46cf9fa2 ILT |
1840 | break; |
1841 | ||
56622147 | 1842 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1843 | // This reloc can appear in debugging sections, in which case we |
1844 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1845 | // tells us this. | |
94c4710f ILT |
1846 | if (optimized_type == tls::TLSOPT_TO_LE) |
1847 | { | |
1848 | gold_assert(tls_segment != NULL); | |
1849 | value -= tls_segment->memsz(); | |
1850 | } | |
46cf9fa2 ILT |
1851 | Relocate_functions<32, false>::rel32(view, value); |
1852 | break; | |
1853 | ||
56622147 ILT |
1854 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1855 | case elfcpp::R_386_TLS_GOTIE: | |
1856 | case elfcpp::R_386_TLS_IE_32: | |
1857 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1858 | { | |
07f397ab | 1859 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1860 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1861 | rel, r_type, value, view, | |
1862 | view_size); | |
1863 | break; | |
1864 | } | |
07f397ab ILT |
1865 | else if (optimized_type == tls::TLSOPT_NONE) |
1866 | { | |
1867 | // Relocate the field with the offset of the GOT entry for | |
1868 | // the tp-relative offset of the symbol. | |
1869 | unsigned int got_offset; | |
1870 | if (gsym != NULL) | |
1871 | { | |
1872 | gold_assert(gsym->has_got_offset()); | |
1873 | got_offset = gsym->got_offset(); | |
1874 | } | |
1875 | else | |
1876 | { | |
1877 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1878 | gold_assert(object->local_has_got_offset(r_sym)); | |
1879 | got_offset = object->local_got_offset(r_sym); | |
1880 | } | |
1881 | // For the R_386_TLS_IE relocation, we need to apply the | |
1882 | // absolute address of the GOT entry. | |
1883 | if (r_type == elfcpp::R_386_TLS_IE) | |
1884 | got_offset += target->got_plt_section()->address(); | |
1885 | // All GOT offsets are relative to the end of the GOT. | |
1886 | got_offset -= target->got_size(); | |
1887 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1888 | break; | |
1889 | } | |
75f2446e ILT |
1890 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1891 | _("unsupported reloc %u"), | |
1892 | r_type); | |
92e059d8 | 1893 | break; |
92e059d8 | 1894 | |
56622147 | 1895 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
1896 | // If we're creating a shared library, a dynamic relocation will |
1897 | // have been created for this location, so do not apply it now. | |
1898 | if (!parameters->output_is_shared()) | |
1899 | { | |
1900 | gold_assert(tls_segment != NULL); | |
1901 | value -= tls_segment->memsz(); | |
1902 | Relocate_functions<32, false>::rel32(view, value); | |
1903 | } | |
56622147 | 1904 | break; |
92e059d8 | 1905 | |
56622147 | 1906 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
1907 | // If we're creating a shared library, a dynamic relocation will |
1908 | // have been created for this location, so do not apply it now. | |
1909 | if (!parameters->output_is_shared()) | |
1910 | { | |
1911 | gold_assert(tls_segment != NULL); | |
1912 | value = tls_segment->memsz() - value; | |
1913 | Relocate_functions<32, false>::rel32(view, value); | |
1914 | } | |
56622147 | 1915 | break; |
92e059d8 | 1916 | } |
92e059d8 ILT |
1917 | } |
1918 | ||
e041f13d | 1919 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1920 | // Local-Exec. |
1921 | ||
1922 | inline void | |
1923 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1924 | size_t relnum, | |
1925 | Output_segment* tls_segment, | |
1926 | const elfcpp::Rel<32, false>& rel, | |
1927 | unsigned int, | |
1928 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1929 | unsigned char* view, | |
fe8718a4 | 1930 | section_size_type view_size) |
ead1e424 ILT |
1931 | { |
1932 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 1933 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
1934 | // leal foo(%reg),%eax; call ___tls_get_addr |
1935 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
1936 | ||
af6359d5 ILT |
1937 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1938 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
1939 | |
1940 | unsigned char op1 = view[-1]; | |
1941 | unsigned char op2 = view[-2]; | |
1942 | ||
af6359d5 ILT |
1943 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1944 | op2 == 0x8d || op2 == 0x04); | |
1945 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
1946 | |
1947 | int roff = 5; | |
1948 | ||
1949 | if (op2 == 0x04) | |
1950 | { | |
af6359d5 ILT |
1951 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
1952 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1953 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1954 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
1955 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
1956 | } | |
1957 | else | |
1958 | { | |
af6359d5 ILT |
1959 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1960 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 1961 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 1962 | && view[9] == 0x90) |
ead1e424 ILT |
1963 | { |
1964 | // There is a trailing nop. Use the size byte subl. | |
1965 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1966 | roff = 6; | |
1967 | } | |
1968 | else | |
1969 | { | |
1970 | // Use the five byte subl. | |
1971 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1972 | } | |
1973 | } | |
1974 | ||
7bf1f802 | 1975 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
1976 | Relocate_functions<32, false>::rel32(view + roff, value); |
1977 | ||
1978 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1979 | // We can skip it. | |
1980 | this->skip_call_tls_get_addr_ = true; | |
1981 | } | |
1982 | ||
7bf1f802 | 1983 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
1984 | // Initial-Exec. |
1985 | ||
1986 | inline void | |
1987 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
1988 | size_t relnum, | |
1989 | Output_segment* tls_segment, | |
1990 | const elfcpp::Rel<32, false>& rel, | |
1991 | unsigned int, | |
1992 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1993 | unsigned char* view, | |
fe8718a4 | 1994 | section_size_type view_size) |
07f397ab ILT |
1995 | { |
1996 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
1997 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
1998 | ||
1999 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2000 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2001 | ||
2002 | unsigned char op1 = view[-1]; | |
2003 | unsigned char op2 = view[-2]; | |
2004 | ||
2005 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2006 | op2 == 0x8d || op2 == 0x04); | |
2007 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2008 | ||
2009 | int roff = 5; | |
2010 | ||
2011 | // FIXME: For now, support only one form. | |
2012 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2013 | op1 == 0x8d && op2 == 0x04); | |
2014 | ||
2015 | if (op2 == 0x04) | |
2016 | { | |
2017 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2018 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2019 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2020 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2021 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2022 | } | |
2023 | else | |
2024 | { | |
2025 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2026 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2027 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2028 | && view[9] == 0x90) |
2029 | { | |
2030 | // FIXME: This is not the right instruction sequence. | |
2031 | // There is a trailing nop. Use the size byte subl. | |
2032 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2033 | roff = 6; | |
2034 | } | |
2035 | else | |
2036 | { | |
2037 | // FIXME: This is not the right instruction sequence. | |
2038 | // Use the five byte subl. | |
2039 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2040 | } | |
2041 | } | |
2042 | ||
7bf1f802 | 2043 | value = tls_segment->memsz() - value; |
07f397ab ILT |
2044 | Relocate_functions<32, false>::rel32(view + roff, value); |
2045 | ||
2046 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2047 | // We can skip it. | |
2048 | this->skip_call_tls_get_addr_ = true; | |
2049 | } | |
2050 | ||
46cf9fa2 ILT |
2051 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2052 | // Local-Exec. | |
2053 | ||
2054 | inline void | |
2055 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2056 | size_t relnum, | |
2057 | Output_segment*, | |
2058 | const elfcpp::Rel<32, false>& rel, | |
2059 | unsigned int, | |
2060 | elfcpp::Elf_types<32>::Elf_Addr, | |
2061 | unsigned char* view, | |
fe8718a4 | 2062 | section_size_type view_size) |
46cf9fa2 ILT |
2063 | { |
2064 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2065 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2066 | ||
af6359d5 ILT |
2067 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2068 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2069 | |
2070 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2071 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2072 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2073 | |
af6359d5 | 2074 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2075 | |
2076 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2077 | ||
2078 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2079 | // We can skip it. | |
2080 | this->skip_call_tls_get_addr_ = true; | |
2081 | } | |
2082 | ||
56622147 ILT |
2083 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2084 | // Local-Exec. | |
2085 | ||
2086 | inline void | |
2087 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2088 | size_t relnum, | |
2089 | Output_segment* tls_segment, | |
2090 | const elfcpp::Rel<32, false>& rel, | |
2091 | unsigned int r_type, | |
2092 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2093 | unsigned char* view, | |
fe8718a4 | 2094 | section_size_type view_size) |
56622147 ILT |
2095 | { |
2096 | // We have to actually change the instructions, which means that we | |
2097 | // need to examine the opcodes to figure out which instruction we | |
2098 | // are looking at. | |
2099 | if (r_type == elfcpp::R_386_TLS_IE) | |
2100 | { | |
2101 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2102 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2103 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2104 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2105 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2106 | ||
2107 | unsigned char op1 = view[-1]; | |
2108 | if (op1 == 0xa1) | |
2109 | { | |
2110 | // movl XX,%eax ==> movl $YY,%eax | |
2111 | view[-1] = 0xb8; | |
2112 | } | |
2113 | else | |
2114 | { | |
2115 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2116 | ||
2117 | unsigned char op2 = view[-2]; | |
2118 | if (op2 == 0x8b) | |
2119 | { | |
2120 | // movl XX,%reg ==> movl $YY,%reg | |
2121 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2122 | (op1 & 0xc7) == 0x05); | |
2123 | view[-2] = 0xc7; | |
2124 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2125 | } | |
2126 | else if (op2 == 0x03) | |
2127 | { | |
2128 | // addl XX,%reg ==> addl $YY,%reg | |
2129 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2130 | (op1 & 0xc7) == 0x05); | |
2131 | view[-2] = 0x81; | |
2132 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2133 | } | |
2134 | else | |
2135 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2136 | } | |
2137 | } | |
2138 | else | |
2139 | { | |
2140 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2141 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2142 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2143 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2144 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2145 | ||
2146 | unsigned char op1 = view[-1]; | |
2147 | unsigned char op2 = view[-2]; | |
2148 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2149 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2150 | if (op2 == 0x8b) | |
2151 | { | |
2152 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2153 | view[-2] = 0xc7; | |
2154 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2155 | } | |
2156 | else if (op2 == 0x2b) | |
2157 | { | |
2158 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2159 | view[-2] = 0x81; | |
2160 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2161 | } | |
2162 | else if (op2 == 0x03) | |
2163 | { | |
2164 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2165 | view[-2] = 0x81; | |
2166 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2167 | } | |
2168 | else | |
2169 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2170 | } | |
2171 | ||
7bf1f802 | 2172 | value = tls_segment->memsz() - value; |
56622147 ILT |
2173 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2174 | value = - value; | |
2175 | ||
2176 | Relocate_functions<32, false>::rel32(view, value); | |
2177 | } | |
2178 | ||
61ba1cf9 ILT |
2179 | // Relocate section data. |
2180 | ||
2181 | void | |
92e059d8 | 2182 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2183 | unsigned int sh_type, |
2184 | const unsigned char* prelocs, | |
2185 | size_t reloc_count, | |
730cdc88 ILT |
2186 | Output_section* output_section, |
2187 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2188 | unsigned char* view, |
2189 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2190 | section_size_type view_size) |
61ba1cf9 | 2191 | { |
a3ad94ed | 2192 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2193 | |
ead1e424 ILT |
2194 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2195 | Target_i386::Relocate>( | |
92e059d8 | 2196 | relinfo, |
ead1e424 | 2197 | this, |
61ba1cf9 ILT |
2198 | prelocs, |
2199 | reloc_count, | |
730cdc88 ILT |
2200 | output_section, |
2201 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2202 | view, |
2203 | address, | |
2204 | view_size); | |
2205 | } | |
2206 | ||
6a74a719 ILT |
2207 | // Return the size of a relocation while scanning during a relocatable |
2208 | // link. | |
2209 | ||
2210 | unsigned int | |
2211 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2212 | unsigned int r_type, | |
2213 | Relobj* object) | |
2214 | { | |
2215 | switch (r_type) | |
2216 | { | |
2217 | case elfcpp::R_386_NONE: | |
2218 | case elfcpp::R_386_GNU_VTINHERIT: | |
2219 | case elfcpp::R_386_GNU_VTENTRY: | |
2220 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2221 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2222 | case elfcpp::R_386_TLS_DESC_CALL: | |
2223 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2224 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2225 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2226 | case elfcpp::R_386_TLS_IE_32: | |
2227 | case elfcpp::R_386_TLS_GOTIE: | |
2228 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2229 | case elfcpp::R_386_TLS_LE_32: | |
2230 | return 0; | |
2231 | ||
2232 | case elfcpp::R_386_32: | |
2233 | case elfcpp::R_386_PC32: | |
2234 | case elfcpp::R_386_GOT32: | |
2235 | case elfcpp::R_386_PLT32: | |
2236 | case elfcpp::R_386_GOTOFF: | |
2237 | case elfcpp::R_386_GOTPC: | |
2238 | return 4; | |
2239 | ||
2240 | case elfcpp::R_386_16: | |
2241 | case elfcpp::R_386_PC16: | |
2242 | return 2; | |
2243 | ||
2244 | case elfcpp::R_386_8: | |
2245 | case elfcpp::R_386_PC8: | |
2246 | return 1; | |
2247 | ||
2248 | // These are relocations which should only be seen by the | |
2249 | // dynamic linker, and should never be seen here. | |
2250 | case elfcpp::R_386_COPY: | |
2251 | case elfcpp::R_386_GLOB_DAT: | |
2252 | case elfcpp::R_386_JUMP_SLOT: | |
2253 | case elfcpp::R_386_RELATIVE: | |
2254 | case elfcpp::R_386_TLS_TPOFF: | |
2255 | case elfcpp::R_386_TLS_DTPMOD32: | |
2256 | case elfcpp::R_386_TLS_DTPOFF32: | |
2257 | case elfcpp::R_386_TLS_TPOFF32: | |
2258 | case elfcpp::R_386_TLS_DESC: | |
2259 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2260 | return 0; | |
2261 | ||
2262 | case elfcpp::R_386_32PLT: | |
2263 | case elfcpp::R_386_TLS_GD_32: | |
2264 | case elfcpp::R_386_TLS_GD_PUSH: | |
2265 | case elfcpp::R_386_TLS_GD_CALL: | |
2266 | case elfcpp::R_386_TLS_GD_POP: | |
2267 | case elfcpp::R_386_TLS_LDM_32: | |
2268 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2269 | case elfcpp::R_386_TLS_LDM_CALL: | |
2270 | case elfcpp::R_386_TLS_LDM_POP: | |
2271 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2272 | default: | |
2273 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2274 | return 0; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | // Scan the relocs during a relocatable link. | |
2279 | ||
2280 | void | |
2281 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2282 | Symbol_table* symtab, | |
2283 | Layout* layout, | |
2284 | Sized_relobj<32, false>* object, | |
2285 | unsigned int data_shndx, | |
2286 | unsigned int sh_type, | |
2287 | const unsigned char* prelocs, | |
2288 | size_t reloc_count, | |
2289 | Output_section* output_section, | |
2290 | bool needs_special_offset_handling, | |
2291 | size_t local_symbol_count, | |
2292 | const unsigned char* plocal_symbols, | |
2293 | Relocatable_relocs* rr) | |
2294 | { | |
2295 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2296 | ||
2297 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2298 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2299 | ||
2300 | gold::scan_relocatable_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
2301 | Scan_relocatable_relocs>( | |
2302 | options, | |
2303 | symtab, | |
2304 | layout, | |
2305 | object, | |
2306 | data_shndx, | |
2307 | prelocs, | |
2308 | reloc_count, | |
2309 | output_section, | |
2310 | needs_special_offset_handling, | |
2311 | local_symbol_count, | |
2312 | plocal_symbols, | |
2313 | rr); | |
2314 | } | |
2315 | ||
2316 | // Relocate a section during a relocatable link. | |
2317 | ||
2318 | void | |
2319 | Target_i386::relocate_for_relocatable( | |
2320 | const Relocate_info<32, false>* relinfo, | |
2321 | unsigned int sh_type, | |
2322 | const unsigned char* prelocs, | |
2323 | size_t reloc_count, | |
2324 | Output_section* output_section, | |
2325 | off_t offset_in_output_section, | |
2326 | const Relocatable_relocs* rr, | |
2327 | unsigned char* view, | |
2328 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2329 | section_size_type view_size, | |
2330 | unsigned char* reloc_view, | |
2331 | section_size_type reloc_view_size) | |
2332 | { | |
2333 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2334 | ||
2335 | gold::relocate_for_relocatable<32, false, Target_i386, elfcpp::SHT_REL>( | |
2336 | relinfo, | |
2337 | prelocs, | |
2338 | reloc_count, | |
2339 | output_section, | |
2340 | offset_in_output_section, | |
2341 | rr, | |
2342 | view, | |
2343 | view_address, | |
2344 | view_size, | |
2345 | reloc_view, | |
2346 | reloc_view_size); | |
2347 | } | |
2348 | ||
ab5c9e90 ILT |
2349 | // Return the value to use for a dynamic which requires special |
2350 | // treatment. This is how we support equality comparisons of function | |
2351 | // pointers across shared library boundaries, as described in the | |
2352 | // processor specific ABI supplement. | |
2353 | ||
2354 | uint64_t | |
2355 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2356 | { | |
2357 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2358 | return this->plt_section()->address() + gsym->plt_offset(); | |
2359 | } | |
2360 | ||
c51e6221 ILT |
2361 | // Return a string used to fill a code section with nops to take up |
2362 | // the specified length. | |
2363 | ||
2364 | std::string | |
fe8718a4 | 2365 | Target_i386::do_code_fill(section_size_type length) |
c51e6221 ILT |
2366 | { |
2367 | if (length >= 16) | |
2368 | { | |
2369 | // Build a jmp instruction to skip over the bytes. | |
2370 | unsigned char jmp[5]; | |
2371 | jmp[0] = 0xe9; | |
2372 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2373 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2374 | + std::string(length - 5, '\0')); | |
2375 | } | |
2376 | ||
2377 | // Nop sequences of various lengths. | |
2378 | const char nop1[1] = { 0x90 }; // nop | |
2379 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2380 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2381 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2382 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2383 | 0x00 }; // leal 0(%esi,1),%esi | |
2384 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2385 | 0x00, 0x00 }; | |
2386 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2387 | 0x00, 0x00, 0x00 }; | |
2388 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2389 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2390 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2391 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2392 | 0x00 }; | |
2393 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2394 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2395 | 0x00, 0x00 }; | |
2396 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2397 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2398 | 0x00, 0x00, 0x00 }; | |
2399 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2400 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2401 | 0x00, 0x00, 0x00, 0x00 }; | |
2402 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2403 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2404 | 0x27, 0x00, 0x00, 0x00, | |
2405 | 0x00 }; | |
2406 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2407 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2408 | 0xbc, 0x27, 0x00, 0x00, | |
2409 | 0x00, 0x00 }; | |
2410 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2411 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2412 | 0x90, 0x90, 0x90, 0x90, | |
2413 | 0x90, 0x90, 0x90 }; | |
2414 | ||
2415 | const char* nops[16] = { | |
2416 | NULL, | |
2417 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2418 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2419 | }; | |
2420 | ||
2421 | return std::string(nops[length], length); | |
2422 | } | |
2423 | ||
14bfc3f5 ILT |
2424 | // The selector for i386 object files. |
2425 | ||
2426 | class Target_selector_i386 : public Target_selector | |
2427 | { | |
2428 | public: | |
2429 | Target_selector_i386() | |
2430 | : Target_selector(elfcpp::EM_386, 32, false) | |
2431 | { } | |
2432 | ||
2433 | Target* | |
ead1e424 ILT |
2434 | recognize(int machine, int osabi, int abiversion); |
2435 | ||
2436 | private: | |
2437 | Target_i386* target_; | |
14bfc3f5 ILT |
2438 | }; |
2439 | ||
2440 | // Recognize an i386 object file when we already know that the machine | |
2441 | // number is EM_386. | |
2442 | ||
2443 | Target* | |
ead1e424 | 2444 | Target_selector_i386::recognize(int, int, int) |
14bfc3f5 | 2445 | { |
ead1e424 ILT |
2446 | if (this->target_ == NULL) |
2447 | this->target_ = new Target_i386(); | |
2448 | return this->target_; | |
14bfc3f5 ILT |
2449 | } |
2450 | ||
2451 | Target_selector_i386 target_selector_i386; | |
2452 | ||
2453 | } // End anonymous namespace. |