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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 | |
c51e6221 ILT |
99 | // Return a string used to fill a code section with nops. |
100 | std::string | |
fe8718a4 | 101 | do_code_fill(section_size_type length); |
c51e6221 | 102 | |
9a2d6984 ILT |
103 | // Return whether SYM is defined by the ABI. |
104 | bool | |
105 | do_is_defined_by_abi(Symbol* sym) const | |
106 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } | |
107 | ||
96f2030e | 108 | // Return the size of the GOT section. |
fe8718a4 | 109 | section_size_type |
96f2030e ILT |
110 | got_size() |
111 | { | |
112 | gold_assert(this->got_ != NULL); | |
113 | return this->got_->data_size(); | |
114 | } | |
115 | ||
92e059d8 ILT |
116 | private: |
117 | // The class which scans relocations. | |
118 | struct Scan | |
61ba1cf9 ILT |
119 | { |
120 | inline void | |
ead1e424 ILT |
121 | local(const General_options& options, Symbol_table* symtab, |
122 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 123 | Sized_relobj<32, false>* object, |
a3ad94ed | 124 | unsigned int data_shndx, |
07f397ab | 125 | Output_section* output_section, |
92e059d8 ILT |
126 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
127 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 128 | |
92e059d8 | 129 | inline void |
ead1e424 ILT |
130 | global(const General_options& options, Symbol_table* symtab, |
131 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 132 | Sized_relobj<32, false>* object, |
a3ad94ed | 133 | unsigned int data_shndx, |
07f397ab | 134 | Output_section* output_section, |
92e059d8 ILT |
135 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
136 | Symbol* gsym); | |
af6359d5 ILT |
137 | |
138 | static void | |
139 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
140 | ||
141 | static void | |
142 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
143 | Symbol*); | |
61ba1cf9 ILT |
144 | }; |
145 | ||
92e059d8 ILT |
146 | // The class which implements relocation. |
147 | class Relocate | |
148 | { | |
149 | public: | |
ead1e424 | 150 | Relocate() |
46cf9fa2 ILT |
151 | : skip_call_tls_get_addr_(false), |
152 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
153 | { } |
154 | ||
155 | ~Relocate() | |
156 | { | |
157 | if (this->skip_call_tls_get_addr_) | |
158 | { | |
159 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 160 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
161 | } |
162 | } | |
163 | ||
86849f1f ILT |
164 | // Return whether the static relocation needs to be applied. |
165 | inline bool | |
166 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
d61c6bd4 ILT |
167 | bool is_absolute_ref, |
168 | bool is_function_call, | |
86849f1f ILT |
169 | bool is_32bit); |
170 | ||
ead1e424 ILT |
171 | // Do a relocation. Return false if the caller should not issue |
172 | // any warnings about this relocation. | |
173 | inline bool | |
174 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 175 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 176 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 177 | const Symbol_value<32>*, |
92e059d8 | 178 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 179 | section_size_type); |
92e059d8 ILT |
180 | |
181 | private: | |
182 | // Do a TLS relocation. | |
ead1e424 | 183 | inline void |
07f397ab ILT |
184 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
185 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 186 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 187 | const Symbol_value<32>*, |
fe8718a4 ILT |
188 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
189 | section_size_type); | |
92e059d8 | 190 | |
07f397ab ILT |
191 | // Do a TLS General-Dynamic to Initial-Exec transition. |
192 | inline void | |
193 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
194 | Output_segment* tls_segment, | |
195 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
196 | elfcpp::Elf_types<32>::Elf_Addr value, | |
197 | unsigned char* view, | |
fe8718a4 | 198 | section_size_type view_size); |
07f397ab | 199 | |
56622147 ILT |
200 | // Do a TLS General-Dynamic to Local-Exec transition. |
201 | inline void | |
202 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
203 | Output_segment* tls_segment, |
204 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
205 | elfcpp::Elf_types<32>::Elf_Addr value, | |
206 | unsigned char* view, | |
fe8718a4 | 207 | section_size_type view_size); |
92e059d8 | 208 | |
56622147 | 209 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 210 | inline void |
56622147 | 211 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
212 | Output_segment* tls_segment, |
213 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
214 | elfcpp::Elf_types<32>::Elf_Addr value, | |
215 | unsigned char* view, | |
fe8718a4 | 216 | section_size_type view_size); |
ead1e424 | 217 | |
56622147 ILT |
218 | // Do a TLS Initial-Exec to Local-Exec transition. |
219 | static inline void | |
220 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
221 | Output_segment* tls_segment, |
222 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
223 | elfcpp::Elf_types<32>::Elf_Addr value, | |
224 | unsigned char* view, | |
fe8718a4 | 225 | section_size_type view_size); |
46cf9fa2 | 226 | |
46cf9fa2 ILT |
227 | // We need to keep track of which type of local dynamic relocation |
228 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
229 | enum Local_dynamic_type | |
230 | { | |
231 | LOCAL_DYNAMIC_NONE, | |
232 | LOCAL_DYNAMIC_SUN, | |
233 | LOCAL_DYNAMIC_GNU | |
234 | }; | |
235 | ||
ead1e424 ILT |
236 | // This is set if we should skip the next reloc, which should be a |
237 | // PLT32 reloc against ___tls_get_addr. | |
238 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
239 | // The type of local dynamic relocation we have seen in the section |
240 | // being relocated, if any. | |
241 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
242 | }; |
243 | ||
244 | // Adjust TLS relocation type based on the options and whether this | |
245 | // is a local symbol. | |
af6359d5 | 246 | static tls::Tls_optimization |
7e1edb90 | 247 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 248 | |
ead1e424 | 249 | // Get the GOT section, creating it if necessary. |
dbe717ef | 250 | Output_data_got<32, false>* |
7e1edb90 | 251 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 252 | |
96f2030e ILT |
253 | // Get the GOT PLT section. |
254 | Output_data_space* | |
255 | got_plt_section() const | |
256 | { | |
257 | gold_assert(this->got_plt_ != NULL); | |
258 | return this->got_plt_; | |
259 | } | |
260 | ||
a3ad94ed ILT |
261 | // Create a PLT entry for a global symbol. |
262 | void | |
7e1edb90 | 263 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 264 | |
94c4710f ILT |
265 | // Create a GOT entry for the TLS module index. |
266 | unsigned int | |
267 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
268 | Sized_relobj<32, false>* object); | |
269 | ||
a3ad94ed | 270 | // Get the PLT section. |
7bb3655e | 271 | const Output_data_plt_i386* |
a3ad94ed ILT |
272 | plt_section() const |
273 | { | |
274 | gold_assert(this->plt_ != NULL); | |
275 | return this->plt_; | |
276 | } | |
277 | ||
5a6f7e2d ILT |
278 | // Get the dynamic reloc section, creating it if necessary. |
279 | Reloc_section* | |
280 | rel_dyn_section(Layout*); | |
281 | ||
d61c6bd4 ILT |
282 | // Return true if the symbol may need a COPY relocation. |
283 | // References from an executable object to non-function symbols | |
284 | // defined in a dynamic object may need a COPY relocation. | |
285 | bool | |
286 | may_need_copy_reloc(Symbol* gsym) | |
287 | { | |
288 | return (!parameters->output_is_shared() | |
289 | && gsym->is_from_dynobj() | |
290 | && gsym->type() != elfcpp::STT_FUNC); | |
291 | } | |
292 | ||
a3ad94ed ILT |
293 | // Copy a relocation against a global symbol. |
294 | void | |
5a6f7e2d ILT |
295 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
296 | Sized_relobj<32, false>*, unsigned int, | |
4f4c5f80 | 297 | Output_section*, Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 298 | |
92e059d8 ILT |
299 | // Information about this specific target which we pass to the |
300 | // general Target structure. | |
75f65a3e | 301 | static const Target::Target_info i386_info; |
ead1e424 ILT |
302 | |
303 | // The GOT section. | |
dbe717ef | 304 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
305 | // The PLT section. |
306 | Output_data_plt_i386* plt_; | |
307 | // The GOT PLT section. | |
308 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
309 | // The dynamic reloc section. |
310 | Reloc_section* rel_dyn_; | |
311 | // Relocs saved to avoid a COPY reloc. | |
312 | Copy_relocs<32, false>* copy_relocs_; | |
313 | // Space for variables copied with a COPY reloc. | |
314 | Output_data_space* dynbss_; | |
94c4710f ILT |
315 | // Offset of the GOT entry for the TLS module index; |
316 | unsigned int got_mod_index_offset_; | |
75f65a3e ILT |
317 | }; |
318 | ||
319 | const Target::Target_info Target_i386::i386_info = | |
320 | { | |
61ba1cf9 ILT |
321 | 32, // size |
322 | false, // is_big_endian | |
323 | elfcpp::EM_386, // machine_code | |
324 | false, // has_make_symbol | |
dbe717ef | 325 | false, // has_resolve |
c51e6221 | 326 | true, // has_code_fill |
35cdfc9a | 327 | true, // is_default_stack_executable |
dbe717ef | 328 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 329 | 0x08048000, // default_text_segment_address |
61ba1cf9 ILT |
330 | 0x1000, // abi_pagesize |
331 | 0x1000 // common_pagesize | |
14bfc3f5 ILT |
332 | }; |
333 | ||
ead1e424 ILT |
334 | // Get the GOT section, creating it if necessary. |
335 | ||
dbe717ef | 336 | Output_data_got<32, false>* |
7e1edb90 | 337 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
338 | { |
339 | if (this->got_ == NULL) | |
340 | { | |
7e1edb90 | 341 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 342 | |
7e1edb90 | 343 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 344 | |
ead1e424 | 345 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
346 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
347 | this->got_); | |
ead1e424 | 348 | |
a3ad94ed ILT |
349 | // The old GNU linker creates a .got.plt section. We just |
350 | // create another set of data in the .got section. Note that we | |
351 | // always create a PLT if we create a GOT, although the PLT | |
352 | // might be empty. | |
353 | this->got_plt_ = new Output_data_space(4); | |
354 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
355 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
356 | this->got_plt_); | |
a3ad94ed | 357 | |
ead1e424 | 358 | // The first three entries are reserved. |
27bc2bce | 359 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 360 | |
a3ad94ed | 361 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
14b31740 | 362 | symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 363 | this->got_plt_, |
ead1e424 | 364 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 365 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
366 | elfcpp::STV_HIDDEN, 0, |
367 | false, false); | |
368 | } | |
a3ad94ed | 369 | |
ead1e424 ILT |
370 | return this->got_; |
371 | } | |
372 | ||
5a6f7e2d ILT |
373 | // Get the dynamic reloc section, creating it if necessary. |
374 | ||
375 | Target_i386::Reloc_section* | |
376 | Target_i386::rel_dyn_section(Layout* layout) | |
377 | { | |
378 | if (this->rel_dyn_ == NULL) | |
379 | { | |
380 | gold_assert(layout != NULL); | |
381 | this->rel_dyn_ = new Reloc_section(); | |
382 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
383 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
384 | } | |
385 | return this->rel_dyn_; | |
386 | } | |
387 | ||
a3ad94ed ILT |
388 | // A class to handle the PLT data. |
389 | ||
390 | class Output_data_plt_i386 : public Output_section_data | |
391 | { | |
392 | public: | |
393 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
394 | ||
7e1edb90 | 395 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
396 | |
397 | // Add an entry to the PLT. | |
398 | void | |
399 | add_entry(Symbol* gsym); | |
400 | ||
16649710 ILT |
401 | // Return the .rel.plt section data. |
402 | const Reloc_section* | |
403 | rel_plt() const | |
404 | { return this->rel_; } | |
405 | ||
406 | protected: | |
407 | void | |
408 | do_adjust_output_section(Output_section* os); | |
409 | ||
a3ad94ed ILT |
410 | private: |
411 | // The size of an entry in the PLT. | |
412 | static const int plt_entry_size = 16; | |
413 | ||
414 | // The first entry in the PLT for an executable. | |
415 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
416 | ||
417 | // The first entry in the PLT for a shared object. | |
418 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
419 | ||
420 | // Other entries in the PLT for an executable. | |
421 | static unsigned char exec_plt_entry[plt_entry_size]; | |
422 | ||
423 | // Other entries in the PLT for a shared object. | |
424 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
425 | ||
426 | // Set the final size. | |
427 | void | |
27bc2bce | 428 | set_final_data_size() |
a3ad94ed ILT |
429 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
430 | ||
431 | // Write out the PLT data. | |
432 | void | |
433 | do_write(Output_file*); | |
434 | ||
435 | // The reloc section. | |
436 | Reloc_section* rel_; | |
437 | // The .got.plt section. | |
438 | Output_data_space* got_plt_; | |
439 | // The number of PLT entries. | |
440 | unsigned int count_; | |
a3ad94ed ILT |
441 | }; |
442 | ||
443 | // Create the PLT section. The ordinary .got section is an argument, | |
444 | // since we need to refer to the start. We also create our own .got | |
445 | // section just for PLT entries. | |
446 | ||
447 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 448 | Output_data_space* got_plt) |
80576242 | 449 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
450 | { |
451 | this->rel_ = new Reloc_section(); | |
452 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
453 | elfcpp::SHF_ALLOC, this->rel_); | |
454 | } | |
455 | ||
16649710 ILT |
456 | void |
457 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
458 | { | |
459 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
460 | // linker, and so do we. | |
461 | os->set_entsize(4); | |
462 | } | |
463 | ||
a3ad94ed ILT |
464 | // Add an entry to the PLT. |
465 | ||
466 | void | |
467 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
468 | { | |
469 | gold_assert(!gsym->has_plt_offset()); | |
470 | ||
471 | // Note that when setting the PLT offset we skip the initial | |
472 | // reserved PLT entry. | |
473 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
474 | ||
475 | ++this->count_; | |
476 | ||
fe8718a4 | 477 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
478 | |
479 | // Every PLT entry needs a GOT entry which points back to the PLT | |
480 | // entry (this will be changed by the dynamic linker, normally | |
481 | // lazily when the function is called). | |
27bc2bce | 482 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
483 | |
484 | // Every PLT entry needs a reloc. | |
16649710 | 485 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
486 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
487 | got_offset); | |
488 | ||
489 | // Note that we don't need to save the symbol. The contents of the | |
490 | // PLT are independent of which symbols are used. The symbols only | |
491 | // appear in the relocations. | |
492 | } | |
493 | ||
494 | // The first entry in the PLT for an executable. | |
495 | ||
496 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
497 | { | |
498 | 0xff, 0x35, // pushl contents of memory address | |
499 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
500 | 0xff, 0x25, // jmp indirect | |
501 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
502 | 0, 0, 0, 0 // unused | |
503 | }; | |
504 | ||
505 | // The first entry in the PLT for a shared object. | |
506 | ||
507 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
508 | { | |
509 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
510 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
511 | 0, 0, 0, 0 // unused | |
512 | }; | |
513 | ||
514 | // Subsequent entries in the PLT for an executable. | |
515 | ||
516 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
517 | { | |
518 | 0xff, 0x25, // jmp indirect | |
519 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
520 | 0x68, // pushl immediate | |
521 | 0, 0, 0, 0, // replaced with offset into relocation table | |
522 | 0xe9, // jmp relative | |
523 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
524 | }; | |
525 | ||
526 | // Subsequent entries in the PLT for a shared object. | |
527 | ||
528 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
529 | { | |
530 | 0xff, 0xa3, // jmp *offset(%ebx) | |
531 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
532 | 0x68, // pushl immediate | |
533 | 0, 0, 0, 0, // replaced with offset into relocation table | |
534 | 0xe9, // jmp relative | |
535 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
536 | }; | |
537 | ||
538 | // Write out the PLT. This uses the hand-coded instructions above, | |
539 | // and adjusts them as needed. This is all specified by the i386 ELF | |
540 | // Processor Supplement. | |
541 | ||
542 | void | |
543 | Output_data_plt_i386::do_write(Output_file* of) | |
544 | { | |
545 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
546 | const section_size_type oview_size = |
547 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
548 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
549 | ||
550 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
551 | const section_size_type got_size = |
552 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
553 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
554 | got_size); | |
555 | ||
556 | unsigned char* pov = oview; | |
557 | ||
558 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
559 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
560 | ||
7e1edb90 | 561 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
562 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
563 | else | |
564 | { | |
565 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
566 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
567 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
568 | } | |
569 | pov += plt_entry_size; | |
570 | ||
571 | unsigned char* got_pov = got_view; | |
572 | ||
573 | memset(got_pov, 0, 12); | |
574 | got_pov += 12; | |
575 | ||
576 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
577 | ||
578 | unsigned int plt_offset = plt_entry_size; | |
579 | unsigned int plt_rel_offset = 0; | |
580 | unsigned int got_offset = 12; | |
581 | const unsigned int count = this->count_; | |
582 | for (unsigned int i = 0; | |
583 | i < count; | |
584 | ++i, | |
585 | pov += plt_entry_size, | |
586 | got_pov += 4, | |
587 | plt_offset += plt_entry_size, | |
588 | plt_rel_offset += rel_size, | |
589 | got_offset += 4) | |
590 | { | |
591 | // Set and adjust the PLT entry itself. | |
592 | ||
7e1edb90 | 593 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
594 | { |
595 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
596 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
597 | } | |
598 | else | |
599 | { | |
600 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
601 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
602 | (got_address | |
603 | + got_offset)); | |
604 | } | |
605 | ||
606 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
607 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
608 | - (plt_offset + plt_entry_size)); | |
609 | ||
610 | // Set the entry in the GOT. | |
611 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
612 | } | |
613 | ||
fe8718a4 ILT |
614 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
615 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
616 | |
617 | of->write_output_view(offset, oview_size, oview); | |
618 | of->write_output_view(got_file_offset, got_size, got_view); | |
619 | } | |
620 | ||
621 | // Create a PLT entry for a global symbol. | |
622 | ||
623 | void | |
7e1edb90 | 624 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
625 | { |
626 | if (gsym->has_plt_offset()) | |
627 | return; | |
628 | ||
629 | if (this->plt_ == NULL) | |
630 | { | |
631 | // Create the GOT sections first. | |
7e1edb90 | 632 | this->got_section(symtab, layout); |
a3ad94ed | 633 | |
7e1edb90 | 634 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
635 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
636 | (elfcpp::SHF_ALLOC | |
637 | | elfcpp::SHF_EXECINSTR), | |
638 | this->plt_); | |
a3ad94ed ILT |
639 | } |
640 | ||
641 | this->plt_->add_entry(gsym); | |
642 | } | |
643 | ||
94c4710f ILT |
644 | // Create a GOT entry for the TLS module index. |
645 | ||
646 | unsigned int | |
647 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
648 | Sized_relobj<32, false>* object) | |
649 | { | |
650 | if (this->got_mod_index_offset_ == -1U) | |
651 | { | |
652 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
653 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
654 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
655 | unsigned int got_offset = got->add_constant(0); | |
656 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
657 | got_offset); | |
658 | got->add_constant(0); | |
659 | this->got_mod_index_offset_ = got_offset; | |
660 | } | |
661 | return this->got_mod_index_offset_; | |
662 | } | |
663 | ||
a3ad94ed ILT |
664 | // Handle a relocation against a non-function symbol defined in a |
665 | // dynamic object. The traditional way to handle this is to generate | |
666 | // a COPY relocation to copy the variable at runtime from the shared | |
667 | // object into the executable's data segment. However, this is | |
668 | // undesirable in general, as if the size of the object changes in the | |
669 | // dynamic object, the executable will no longer work correctly. If | |
670 | // this relocation is in a writable section, then we can create a | |
671 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
672 | // address at runtime. However, we do not want do that if the | |
673 | // relocation is in a read-only section, as it would prevent the | |
674 | // readonly segment from being shared. And if we have to eventually | |
675 | // generate a COPY reloc, then any dynamic relocations will be | |
676 | // useless. So this means that if this is a writable section, we need | |
677 | // to save the relocation until we see whether we have to create a | |
678 | // COPY relocation for this symbol for any other relocation. | |
679 | ||
680 | void | |
681 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
682 | Symbol_table* symtab, |
683 | Layout* layout, | |
a3ad94ed | 684 | Sized_relobj<32, false>* object, |
4f4c5f80 ILT |
685 | unsigned int data_shndx, |
686 | Output_section* output_section, | |
687 | Symbol* gsym, | |
5a6f7e2d | 688 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 689 | { |
5a6f7e2d ILT |
690 | Sized_symbol<32>* ssym; |
691 | ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym | |
692 | SELECT_SIZE(32)); | |
693 | ||
694 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
695 | data_shndx, ssym)) | |
a3ad94ed ILT |
696 | { |
697 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
698 | // If it turns out that we never need a COPY reloc for this |
699 | // symbol, then we will emit the relocation. | |
700 | if (this->copy_relocs_ == NULL) | |
701 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
4f4c5f80 | 702 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rel); |
a3ad94ed | 703 | } |
5a6f7e2d ILT |
704 | else |
705 | { | |
706 | // Allocate space for this symbol in the .bss section. | |
707 | ||
708 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
709 | ||
710 | // There is no defined way to determine the required alignment | |
711 | // of the symbol. We pick the alignment based on the size. We | |
712 | // set an arbitrary maximum of 256. | |
713 | unsigned int align; | |
714 | for (align = 1; align < 512; align <<= 1) | |
715 | if ((symsize & align) != 0) | |
716 | break; | |
a3ad94ed | 717 | |
5a6f7e2d ILT |
718 | if (this->dynbss_ == NULL) |
719 | { | |
720 | this->dynbss_ = new Output_data_space(align); | |
721 | layout->add_output_section_data(".bss", | |
722 | elfcpp::SHT_NOBITS, | |
723 | (elfcpp::SHF_ALLOC | |
724 | | elfcpp::SHF_WRITE), | |
725 | this->dynbss_); | |
726 | } | |
727 | ||
728 | Output_data_space* dynbss = this->dynbss_; | |
729 | ||
730 | if (align > dynbss->addralign()) | |
731 | dynbss->set_space_alignment(align); | |
732 | ||
fe8718a4 ILT |
733 | section_size_type dynbss_size = |
734 | convert_to_section_size_type(dynbss->current_data_size()); | |
5a6f7e2d | 735 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 736 | section_size_type offset = dynbss_size; |
27bc2bce | 737 | dynbss->set_current_data_size(dynbss_size + symsize); |
5a6f7e2d | 738 | |
46fe1623 | 739 | symtab->define_with_copy_reloc(this, ssym, dynbss, offset); |
5a6f7e2d ILT |
740 | |
741 | // Add the COPY reloc. | |
742 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
743 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
744 | } | |
a3ad94ed ILT |
745 | } |
746 | ||
92e059d8 | 747 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
748 | // symbol. IS_FINAL is true if the final address of this symbol is |
749 | // known at link time. | |
92e059d8 | 750 | |
af6359d5 | 751 | tls::Tls_optimization |
7e1edb90 | 752 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
753 | { |
754 | // If we are generating a shared library, then we can't do anything | |
755 | // in the linker. | |
7e1edb90 | 756 | if (parameters->output_is_shared()) |
af6359d5 | 757 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
758 | |
759 | switch (r_type) | |
760 | { | |
761 | case elfcpp::R_386_TLS_GD: | |
762 | case elfcpp::R_386_TLS_GOTDESC: | |
763 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 764 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
765 | // access. Since we know that we are generating an executable, |
766 | // we can convert this to Initial-Exec. If we also know that | |
767 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 768 | if (is_final) |
af6359d5 ILT |
769 | return tls::TLSOPT_TO_LE; |
770 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
771 | |
772 | case elfcpp::R_386_TLS_LDM: | |
773 | // This is Local-Dynamic, which refers to a local symbol in the | |
774 | // dynamic TLS block. Since we know that we generating an | |
775 | // executable, we can switch to Local-Exec. | |
af6359d5 | 776 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
777 | |
778 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
779 | // Another type of Local-Dynamic relocation. |
780 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
781 | |
782 | case elfcpp::R_386_TLS_IE: | |
783 | case elfcpp::R_386_TLS_GOTIE: | |
784 | case elfcpp::R_386_TLS_IE_32: | |
785 | // These are Initial-Exec relocs which get the thread offset | |
786 | // from the GOT. If we know that we are linking against the | |
787 | // local symbol, we can switch to Local-Exec, which links the | |
788 | // thread offset into the instruction. | |
a3ad94ed | 789 | if (is_final) |
af6359d5 ILT |
790 | return tls::TLSOPT_TO_LE; |
791 | return tls::TLSOPT_NONE; | |
8462ae85 | 792 | |
92e059d8 ILT |
793 | case elfcpp::R_386_TLS_LE: |
794 | case elfcpp::R_386_TLS_LE_32: | |
795 | // When we already have Local-Exec, there is nothing further we | |
796 | // can do. | |
af6359d5 | 797 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
798 | |
799 | default: | |
a3ad94ed | 800 | gold_unreachable(); |
92e059d8 ILT |
801 | } |
802 | } | |
803 | ||
af6359d5 ILT |
804 | // Report an unsupported relocation against a local symbol. |
805 | ||
806 | void | |
807 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
808 | unsigned int r_type) | |
809 | { | |
75f2446e ILT |
810 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
811 | object->name().c_str(), r_type); | |
af6359d5 ILT |
812 | } |
813 | ||
92e059d8 ILT |
814 | // Scan a relocation for a local symbol. |
815 | ||
816 | inline void | |
7e1edb90 | 817 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
818 | Symbol_table* symtab, |
819 | Layout* layout, | |
820 | Target_i386* target, | |
f6ce93d6 | 821 | Sized_relobj<32, false>* object, |
1b64748b | 822 | unsigned int data_shndx, |
07f397ab | 823 | Output_section* output_section, |
1b64748b | 824 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 825 | unsigned int r_type, |
7bf1f802 | 826 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
827 | { |
828 | switch (r_type) | |
829 | { | |
830 | case elfcpp::R_386_NONE: | |
831 | case elfcpp::R_386_GNU_VTINHERIT: | |
832 | case elfcpp::R_386_GNU_VTENTRY: | |
833 | break; | |
834 | ||
835 | case elfcpp::R_386_32: | |
436ca963 ILT |
836 | // If building a shared library (or a position-independent |
837 | // executable), we need to create a dynamic relocation for | |
838 | // this location. The relocation applied at link time will | |
839 | // apply the link-time value, so we flag the location with | |
840 | // an R_386_RELATIVE relocation so the dynamic loader can | |
841 | // relocate it easily. | |
842 | if (parameters->output_is_position_independent()) | |
843 | { | |
844 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
845 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
846 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
847 | output_section, data_shndx, | |
848 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
849 | } |
850 | break; | |
851 | ||
852 | case elfcpp::R_386_16: | |
853 | case elfcpp::R_386_8: | |
854 | // If building a shared library (or a position-independent | |
855 | // executable), we need to create a dynamic relocation for | |
856 | // this location. Because the addend needs to remain in the | |
857 | // data section, we need to be careful not to apply this | |
858 | // relocation statically. | |
859 | if (parameters->output_is_position_independent()) | |
860 | { | |
861 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
862 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
4f4c5f80 | 863 | rel_dyn->add_local(object, r_sym, r_type, output_section, data_shndx, |
d61c6bd4 | 864 | reloc.get_r_offset()); |
436ca963 | 865 | } |
92e059d8 ILT |
866 | break; |
867 | ||
868 | case elfcpp::R_386_PC32: | |
869 | case elfcpp::R_386_PC16: | |
870 | case elfcpp::R_386_PC8: | |
871 | break; | |
872 | ||
df2efe71 ILT |
873 | case elfcpp::R_386_PLT32: |
874 | // Since we know this is a local symbol, we can handle this as a | |
875 | // PC32 reloc. | |
876 | break; | |
877 | ||
ead1e424 ILT |
878 | case elfcpp::R_386_GOTOFF: |
879 | case elfcpp::R_386_GOTPC: | |
880 | // We need a GOT section. | |
7e1edb90 | 881 | target->got_section(symtab, layout); |
ead1e424 ILT |
882 | break; |
883 | ||
1b64748b ILT |
884 | case elfcpp::R_386_GOT32: |
885 | { | |
886 | // The symbol requires a GOT entry. | |
887 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
888 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
889 | if (got->add_local(object, r_sym)) | |
890 | { | |
891 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 892 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
436ca963 | 893 | if (parameters->output_is_position_independent()) |
1b64748b ILT |
894 | { |
895 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
896 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
897 | rel_dyn->add_local_relative(object, r_sym, | |
898 | elfcpp::R_386_RELATIVE, | |
899 | got, | |
900 | object->local_got_offset(r_sym)); | |
1b64748b ILT |
901 | } |
902 | } | |
903 | } | |
904 | break; | |
905 | ||
af6359d5 ILT |
906 | // These are relocations which should only be seen by the |
907 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
908 | case elfcpp::R_386_COPY: |
909 | case elfcpp::R_386_GLOB_DAT: | |
910 | case elfcpp::R_386_JUMP_SLOT: | |
911 | case elfcpp::R_386_RELATIVE: | |
912 | case elfcpp::R_386_TLS_TPOFF: | |
913 | case elfcpp::R_386_TLS_DTPMOD32: | |
914 | case elfcpp::R_386_TLS_DTPOFF32: | |
915 | case elfcpp::R_386_TLS_TPOFF32: | |
916 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 917 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 918 | object->name().c_str(), r_type); |
92e059d8 ILT |
919 | break; |
920 | ||
af6359d5 | 921 | // These are initial TLS relocs, which are expected when |
d61c17ea | 922 | // linking. |
56622147 ILT |
923 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
924 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
925 | case elfcpp::R_386_TLS_DESC_CALL: | |
926 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
927 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
928 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 929 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
930 | case elfcpp::R_386_TLS_GOTIE: |
931 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 932 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 933 | { |
80576242 | 934 | bool output_is_shared = parameters->output_is_shared(); |
af6359d5 ILT |
935 | const tls::Tls_optimization optimized_type |
936 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
937 | switch (r_type) |
938 | { | |
56622147 | 939 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
940 | if (optimized_type == tls::TLSOPT_NONE) |
941 | { | |
942 | // Create a pair of GOT entries for the module index and | |
943 | // dtv-relative offset. | |
944 | Output_data_got<32, false>* got | |
945 | = target->got_section(symtab, layout); | |
946 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
947 | got->add_local_tls_with_rel(object, r_sym, |
948 | lsym.get_st_shndx(), true, | |
949 | target->rel_dyn_section(layout), | |
950 | elfcpp::R_386_TLS_DTPMOD32); | |
07f397ab ILT |
951 | } |
952 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
953 | unsupported_reloc_local(object, r_type); | |
954 | break; | |
955 | ||
56622147 ILT |
956 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
957 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
958 | // FIXME: If not relaxing to LE, we need to generate |
959 | // a GOT entry with an R_386_TLS_DESC reloc. | |
960 | if (optimized_type != tls::TLSOPT_TO_LE) | |
961 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
962 | break; |
963 | ||
56622147 | 964 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
965 | if (optimized_type == tls::TLSOPT_NONE) |
966 | { | |
967 | // Create a GOT entry for the module index. | |
94c4710f | 968 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
969 | } |
970 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
971 | unsupported_reloc_local(object, r_type); |
972 | break; | |
973 | ||
56622147 | 974 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
975 | break; |
976 | ||
56622147 ILT |
977 | case elfcpp::R_386_TLS_IE: // Initial-exec |
978 | case elfcpp::R_386_TLS_IE_32: | |
979 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 980 | layout->set_has_static_tls(); |
07f397ab ILT |
981 | if (optimized_type == tls::TLSOPT_NONE) |
982 | { | |
7bf1f802 ILT |
983 | // For the R_386_TLS_IE relocation, we need to create a |
984 | // dynamic relocation when building a shared library. | |
985 | if (r_type == elfcpp::R_386_TLS_IE | |
986 | && parameters->output_is_shared()) | |
987 | { | |
988 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
989 | unsigned int r_sym |
990 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
991 | rel_dyn->add_local_relative(object, r_sym, | |
992 | elfcpp::R_386_RELATIVE, | |
993 | output_section, data_shndx, | |
994 | reloc.get_r_offset()); | |
7bf1f802 | 995 | } |
07f397ab ILT |
996 | // Create a GOT entry for the tp-relative offset. |
997 | Output_data_got<32, false>* got | |
998 | = target->got_section(symtab, layout); | |
999 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1000 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1001 | ? elfcpp::R_386_TLS_TPOFF32 | |
1002 | : elfcpp::R_386_TLS_TPOFF); | |
1003 | got->add_local_with_rel(object, r_sym, | |
1004 | target->rel_dyn_section(layout), | |
1005 | dyn_r_type); | |
07f397ab ILT |
1006 | } |
1007 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1008 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1009 | break; |
af6359d5 | 1010 | |
56622147 ILT |
1011 | case elfcpp::R_386_TLS_LE: // Local-exec |
1012 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1013 | layout->set_has_static_tls(); |
07f397ab | 1014 | if (output_is_shared) |
7bf1f802 ILT |
1015 | { |
1016 | // We need to create a dynamic relocation. | |
1017 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1018 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1019 | ? elfcpp::R_386_TLS_TPOFF32 | |
1020 | : elfcpp::R_386_TLS_TPOFF); | |
1021 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1022 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1023 | data_shndx, reloc.get_r_offset()); | |
1024 | } | |
56622147 ILT |
1025 | break; |
1026 | ||
af6359d5 ILT |
1027 | default: |
1028 | gold_unreachable(); | |
7e1edb90 ILT |
1029 | } |
1030 | } | |
92e059d8 ILT |
1031 | break; |
1032 | ||
92e059d8 ILT |
1033 | case elfcpp::R_386_32PLT: |
1034 | case elfcpp::R_386_TLS_GD_32: | |
1035 | case elfcpp::R_386_TLS_GD_PUSH: | |
1036 | case elfcpp::R_386_TLS_GD_CALL: | |
1037 | case elfcpp::R_386_TLS_GD_POP: | |
1038 | case elfcpp::R_386_TLS_LDM_32: | |
1039 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1040 | case elfcpp::R_386_TLS_LDM_CALL: | |
1041 | case elfcpp::R_386_TLS_LDM_POP: | |
1042 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1043 | default: | |
af6359d5 | 1044 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1045 | break; |
1046 | } | |
1047 | } | |
1048 | ||
af6359d5 ILT |
1049 | // Report an unsupported relocation against a global symbol. |
1050 | ||
1051 | void | |
1052 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1053 | unsigned int r_type, | |
1054 | Symbol* gsym) | |
1055 | { | |
75f2446e | 1056 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1057 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1058 | } |
1059 | ||
92e059d8 ILT |
1060 | // Scan a relocation for a global symbol. |
1061 | ||
1062 | inline void | |
1063 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
1064 | Symbol_table* symtab, |
1065 | Layout* layout, | |
1066 | Target_i386* target, | |
f6ce93d6 | 1067 | Sized_relobj<32, false>* object, |
a3ad94ed | 1068 | unsigned int data_shndx, |
07f397ab | 1069 | Output_section* output_section, |
a3ad94ed ILT |
1070 | const elfcpp::Rel<32, false>& reloc, |
1071 | unsigned int r_type, | |
92e059d8 ILT |
1072 | Symbol* gsym) |
1073 | { | |
1074 | switch (r_type) | |
1075 | { | |
1076 | case elfcpp::R_386_NONE: | |
1077 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1078 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1079 | break; |
1080 | ||
1081 | case elfcpp::R_386_32: | |
92e059d8 | 1082 | case elfcpp::R_386_16: |
92e059d8 | 1083 | case elfcpp::R_386_8: |
96f2030e | 1084 | { |
d61c6bd4 ILT |
1085 | // Make a PLT entry if necessary. |
1086 | if (gsym->needs_plt_entry()) | |
1087 | { | |
1088 | target->make_plt_entry(symtab, layout, gsym); | |
1089 | // Since this is not a PC-relative relocation, we may be | |
1090 | // taking the address of a function. In that case we need to | |
1091 | // set the entry in the dynamic symbol table to the address of | |
1092 | // the PLT entry. | |
1093 | if (gsym->is_from_dynobj()) | |
1094 | gsym->set_needs_dynsym_value(); | |
1095 | } | |
1096 | // Make a dynamic relocation if necessary. | |
1097 | if (gsym->needs_dynamic_reloc(true, false)) | |
1098 | { | |
1099 | if (target->may_need_copy_reloc(gsym)) | |
1100 | { | |
07f397ab | 1101 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1102 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1103 | } |
1104 | else if (r_type == elfcpp::R_386_32 | |
1105 | && gsym->can_use_relative_reloc(false)) | |
1106 | { | |
1107 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1108 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1109 | output_section, object, | |
1110 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1111 | } |
1112 | else | |
1113 | { | |
96f2030e | 1114 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1115 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1116 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1117 | } |
1118 | } | |
1119 | } | |
1120 | break; | |
1121 | ||
1122 | case elfcpp::R_386_PC32: | |
1123 | case elfcpp::R_386_PC16: | |
1124 | case elfcpp::R_386_PC8: | |
1125 | { | |
1126 | // Make a PLT entry if necessary. | |
1127 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1128 | { |
1129 | // These relocations are used for function calls only in | |
1130 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1131 | // we'll need a text relocation anyway, so we can skip the | |
1132 | // PLT entry and let the dynamic linker bind the call directly | |
1133 | // to the target. For smaller relocations, we should use a | |
1134 | // PLT entry to ensure that the call can reach. | |
1135 | if (!parameters->output_is_shared() | |
1136 | || r_type != elfcpp::R_386_PC32) | |
1137 | target->make_plt_entry(symtab, layout, gsym); | |
1138 | } | |
d61c6bd4 ILT |
1139 | // Make a dynamic relocation if necessary. |
1140 | bool is_function_call = (gsym->type() == elfcpp::STT_FUNC); | |
1141 | if (gsym->needs_dynamic_reloc(false, is_function_call)) | |
96f2030e | 1142 | { |
d61c6bd4 ILT |
1143 | if (target->may_need_copy_reloc(gsym)) |
1144 | { | |
07f397ab | 1145 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1146 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1147 | } |
86849f1f | 1148 | else |
d61c6bd4 ILT |
1149 | { |
1150 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1151 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1152 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1153 | } |
96f2030e ILT |
1154 | } |
1155 | } | |
92e059d8 ILT |
1156 | break; |
1157 | ||
ead1e424 | 1158 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1159 | { |
1160 | // The symbol requires a GOT entry. | |
7e1edb90 | 1161 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 ILT |
1162 | if (gsym->final_value_is_known()) |
1163 | got->add_global(gsym); | |
1164 | else | |
1165 | { | |
8462ae85 | 1166 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1167 | // GOT entry with a dynamic relocation. |
1168 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1169 | if (gsym->is_from_dynobj() || gsym->is_preemptible()) | |
1170 | got->add_global_with_rel(gsym, rel_dyn, elfcpp::R_386_GLOB_DAT); | |
1171 | else | |
8462ae85 | 1172 | { |
7bf1f802 | 1173 | if (got->add_global(gsym)) |
e8c846c3 ILT |
1174 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1175 | got, gsym->got_offset()); | |
8462ae85 ILT |
1176 | } |
1177 | } | |
1178 | } | |
ead1e424 ILT |
1179 | break; |
1180 | ||
1181 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1182 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1183 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1184 | if (gsym->final_value_is_known()) |
ead1e424 | 1185 | break; |
436ca963 ILT |
1186 | // If building a shared library, we can also skip the PLT entry |
1187 | // if the symbol is defined in the output file and is protected | |
1188 | // or hidden. | |
1189 | if (gsym->is_defined() | |
1190 | && !gsym->is_from_dynobj() | |
1191 | && !gsym->is_preemptible()) | |
1192 | break; | |
7e1edb90 | 1193 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1194 | break; |
1195 | ||
1196 | case elfcpp::R_386_GOTOFF: | |
1197 | case elfcpp::R_386_GOTPC: | |
1198 | // We need a GOT section. | |
7e1edb90 | 1199 | target->got_section(symtab, layout); |
ead1e424 ILT |
1200 | break; |
1201 | ||
af6359d5 ILT |
1202 | // These are relocations which should only be seen by the |
1203 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1204 | case elfcpp::R_386_COPY: |
1205 | case elfcpp::R_386_GLOB_DAT: | |
1206 | case elfcpp::R_386_JUMP_SLOT: | |
1207 | case elfcpp::R_386_RELATIVE: | |
1208 | case elfcpp::R_386_TLS_TPOFF: | |
1209 | case elfcpp::R_386_TLS_DTPMOD32: | |
1210 | case elfcpp::R_386_TLS_DTPOFF32: | |
1211 | case elfcpp::R_386_TLS_TPOFF32: | |
1212 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1213 | gold_error(_("%s: unexpected reloc %u in object file"), |
1214 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1215 | break; |
1216 | ||
d61c17ea ILT |
1217 | // These are initial tls relocs, which are expected when |
1218 | // linking. | |
56622147 ILT |
1219 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1220 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1221 | case elfcpp::R_386_TLS_DESC_CALL: | |
1222 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1223 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1224 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1225 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1226 | case elfcpp::R_386_TLS_GOTIE: |
1227 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1228 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1229 | { |
7e1edb90 | 1230 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1231 | const tls::Tls_optimization optimized_type |
1232 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1233 | switch (r_type) |
1234 | { | |
56622147 | 1235 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1236 | if (optimized_type == tls::TLSOPT_NONE) |
1237 | { | |
1238 | // Create a pair of GOT entries for the module index and | |
1239 | // dtv-relative offset. | |
1240 | Output_data_got<32, false>* got | |
1241 | = target->got_section(symtab, layout); | |
7bf1f802 ILT |
1242 | got->add_global_tls_with_rel(gsym, |
1243 | target->rel_dyn_section(layout), | |
1244 | elfcpp::R_386_TLS_DTPMOD32, | |
1245 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1246 | } |
1247 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1248 | { | |
1249 | // Create a GOT entry for the tp-relative offset. | |
1250 | Output_data_got<32, false>* got | |
1251 | = target->got_section(symtab, layout); | |
7bf1f802 ILT |
1252 | got->add_global_with_rel(gsym, target->rel_dyn_section(layout), |
1253 | elfcpp::R_386_TLS_TPOFF32); | |
07f397ab ILT |
1254 | } |
1255 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1256 | unsupported_reloc_global(object, r_type, gsym); | |
1257 | break; | |
1258 | ||
56622147 ILT |
1259 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
1260 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
1261 | // FIXME: If not relaxing to LE, we need to generate |
1262 | // a GOT entry with an R_386_TLS_DESC reloc. | |
1263 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1264 | unsupported_reloc_global(object, r_type, gsym); | |
07f397ab | 1265 | unsupported_reloc_global(object, r_type, gsym); |
af6359d5 ILT |
1266 | break; |
1267 | ||
56622147 | 1268 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1269 | if (optimized_type == tls::TLSOPT_NONE) |
1270 | { | |
1271 | // Create a GOT entry for the module index. | |
94c4710f | 1272 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1273 | } |
1274 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1275 | unsupported_reloc_global(object, r_type, gsym); |
1276 | break; | |
1277 | ||
56622147 | 1278 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1279 | break; |
1280 | ||
56622147 ILT |
1281 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1282 | case elfcpp::R_386_TLS_IE_32: | |
1283 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1284 | layout->set_has_static_tls(); |
07f397ab ILT |
1285 | if (optimized_type == tls::TLSOPT_NONE) |
1286 | { | |
7bf1f802 ILT |
1287 | // For the R_386_TLS_IE relocation, we need to create a |
1288 | // dynamic relocation when building a shared library. | |
1289 | if (r_type == elfcpp::R_386_TLS_IE | |
1290 | && parameters->output_is_shared()) | |
07f397ab | 1291 | { |
07f397ab | 1292 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1293 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1294 | output_section, object, | |
1295 | data_shndx, | |
1296 | reloc.get_r_offset()); | |
07f397ab | 1297 | } |
7bf1f802 ILT |
1298 | // Create a GOT entry for the tp-relative offset. |
1299 | Output_data_got<32, false>* got | |
1300 | = target->got_section(symtab, layout); | |
1301 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1302 | ? elfcpp::R_386_TLS_TPOFF32 | |
1303 | : elfcpp::R_386_TLS_TPOFF); | |
1304 | got->add_global_with_rel(gsym, | |
1305 | target->rel_dyn_section(layout), | |
1306 | dyn_r_type); | |
07f397ab ILT |
1307 | } |
1308 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1309 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1310 | break; |
af6359d5 | 1311 | |
56622147 ILT |
1312 | case elfcpp::R_386_TLS_LE: // Local-exec |
1313 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1314 | layout->set_has_static_tls(); |
07f397ab | 1315 | if (parameters->output_is_shared()) |
7bf1f802 ILT |
1316 | { |
1317 | // We need to create a dynamic relocation. | |
1318 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1319 | ? elfcpp::R_386_TLS_TPOFF32 | |
1320 | : elfcpp::R_386_TLS_TPOFF); | |
1321 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1322 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1323 | data_shndx, reloc.get_r_offset()); | |
1324 | } | |
56622147 ILT |
1325 | break; |
1326 | ||
af6359d5 ILT |
1327 | default: |
1328 | gold_unreachable(); | |
a3ad94ed ILT |
1329 | } |
1330 | } | |
92e059d8 ILT |
1331 | break; |
1332 | ||
92e059d8 ILT |
1333 | case elfcpp::R_386_32PLT: |
1334 | case elfcpp::R_386_TLS_GD_32: | |
1335 | case elfcpp::R_386_TLS_GD_PUSH: | |
1336 | case elfcpp::R_386_TLS_GD_CALL: | |
1337 | case elfcpp::R_386_TLS_GD_POP: | |
1338 | case elfcpp::R_386_TLS_LDM_32: | |
1339 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1340 | case elfcpp::R_386_TLS_LDM_CALL: | |
1341 | case elfcpp::R_386_TLS_LDM_POP: | |
1342 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1343 | default: | |
af6359d5 | 1344 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1345 | break; |
1346 | } | |
1347 | } | |
1348 | ||
1349 | // Scan relocations for a section. | |
1350 | ||
1351 | void | |
1352 | Target_i386::scan_relocs(const General_options& options, | |
1353 | Symbol_table* symtab, | |
ead1e424 | 1354 | Layout* layout, |
f6ce93d6 | 1355 | Sized_relobj<32, false>* object, |
a3ad94ed | 1356 | unsigned int data_shndx, |
92e059d8 ILT |
1357 | unsigned int sh_type, |
1358 | const unsigned char* prelocs, | |
1359 | size_t reloc_count, | |
730cdc88 ILT |
1360 | Output_section* output_section, |
1361 | bool needs_special_offset_handling, | |
92e059d8 | 1362 | size_t local_symbol_count, |
730cdc88 | 1363 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1364 | { |
1365 | if (sh_type == elfcpp::SHT_RELA) | |
1366 | { | |
75f2446e ILT |
1367 | gold_error(_("%s: unsupported RELA reloc section"), |
1368 | object->name().c_str()); | |
1369 | return; | |
92e059d8 ILT |
1370 | } |
1371 | ||
ead1e424 ILT |
1372 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1373 | Target_i386::Scan>( | |
92e059d8 ILT |
1374 | options, |
1375 | symtab, | |
ead1e424 ILT |
1376 | layout, |
1377 | this, | |
92e059d8 | 1378 | object, |
a3ad94ed | 1379 | data_shndx, |
92e059d8 ILT |
1380 | prelocs, |
1381 | reloc_count, | |
730cdc88 ILT |
1382 | output_section, |
1383 | needs_special_offset_handling, | |
92e059d8 | 1384 | local_symbol_count, |
730cdc88 | 1385 | plocal_symbols); |
92e059d8 ILT |
1386 | } |
1387 | ||
16649710 | 1388 | // Finalize the sections. |
5a6f7e2d ILT |
1389 | |
1390 | void | |
7e1edb90 | 1391 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1392 | { |
16649710 ILT |
1393 | // Fill in some more dynamic tags. |
1394 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1395 | if (odyn != NULL) | |
1396 | { | |
1397 | if (this->got_plt_ != NULL) | |
1398 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1399 | ||
1400 | if (this->plt_ != NULL) | |
1401 | { | |
1402 | const Output_data* od = this->plt_->rel_plt(); | |
1403 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1404 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1405 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1406 | } | |
1407 | ||
1408 | if (this->rel_dyn_ != NULL) | |
1409 | { | |
1410 | const Output_data* od = this->rel_dyn_; | |
1411 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1412 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1413 | odyn->add_constant(elfcpp::DT_RELENT, | |
1414 | elfcpp::Elf_sizes<32>::rel_size); | |
1415 | } | |
1416 | ||
7e1edb90 | 1417 | if (!parameters->output_is_shared()) |
16649710 ILT |
1418 | { |
1419 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1420 | // linker at run time, and used by the debugger. | |
1421 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1426 | // relocs. | |
5a6f7e2d ILT |
1427 | if (this->copy_relocs_ == NULL) |
1428 | return; | |
1429 | if (this->copy_relocs_->any_to_emit()) | |
1430 | { | |
1431 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1432 | this->copy_relocs_->emit(rel_dyn); | |
1433 | } | |
1434 | delete this->copy_relocs_; | |
1435 | this->copy_relocs_ = NULL; | |
1436 | } | |
1437 | ||
86849f1f ILT |
1438 | // Return whether a direct absolute static relocation needs to be applied. |
1439 | // In cases where Scan::local() or Scan::global() has created | |
1440 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1441 | // of the relocation is carried in the data, and we must not | |
1442 | // apply the static relocation. | |
1443 | ||
1444 | inline bool | |
1445 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
d61c6bd4 ILT |
1446 | bool is_absolute_ref, |
1447 | bool is_function_call, | |
86849f1f ILT |
1448 | bool is_32bit) |
1449 | { | |
d61c6bd4 ILT |
1450 | // For local symbols, we will have created a non-RELATIVE dynamic |
1451 | // relocation only if (a) the output is position independent, | |
1452 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1453 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1454 | if (gsym == NULL) |
d61c6bd4 ILT |
1455 | return !(parameters->output_is_position_independent() |
1456 | && is_absolute_ref | |
1457 | && !is_32bit); | |
86849f1f | 1458 | |
d61c6bd4 ILT |
1459 | // For global symbols, we use the same helper routines used in the scan pass. |
1460 | return !(gsym->needs_dynamic_reloc(is_absolute_ref, is_function_call) | |
1461 | && !gsym->can_use_relative_reloc(is_function_call)); | |
86849f1f ILT |
1462 | } |
1463 | ||
61ba1cf9 ILT |
1464 | // Perform a relocation. |
1465 | ||
ead1e424 | 1466 | inline bool |
92e059d8 | 1467 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1468 | Target_i386* target, |
92e059d8 ILT |
1469 | size_t relnum, |
1470 | const elfcpp::Rel<32, false>& rel, | |
1471 | unsigned int r_type, | |
c06b7b0b | 1472 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1473 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1474 | unsigned char* view, |
1475 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1476 | section_size_type view_size) |
61ba1cf9 | 1477 | { |
ead1e424 ILT |
1478 | if (this->skip_call_tls_get_addr_) |
1479 | { | |
1480 | if (r_type != elfcpp::R_386_PLT32 | |
1481 | || gsym == NULL | |
1482 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1483 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1484 | _("missing expected TLS relocation")); | |
1485 | else | |
ead1e424 | 1486 | { |
75f2446e ILT |
1487 | this->skip_call_tls_get_addr_ = false; |
1488 | return false; | |
ead1e424 | 1489 | } |
ead1e424 ILT |
1490 | } |
1491 | ||
a3ad94ed | 1492 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1493 | Symbol_value<32> symval; |
436ca963 ILT |
1494 | if (gsym != NULL |
1495 | && (gsym->is_from_dynobj() | |
1496 | || (parameters->output_is_shared() | |
1497 | && gsym->is_preemptible())) | |
1498 | && gsym->has_plt_offset()) | |
a3ad94ed | 1499 | { |
b8e6aad9 ILT |
1500 | symval.set_output_value(target->plt_section()->address() |
1501 | + gsym->plt_offset()); | |
1502 | psymval = &symval; | |
a3ad94ed ILT |
1503 | } |
1504 | ||
b8e6aad9 ILT |
1505 | const Sized_relobj<32, false>* object = relinfo->object; |
1506 | ||
1b64748b | 1507 | // Get the GOT offset if needed. |
96f2030e ILT |
1508 | // The GOT pointer points to the end of the GOT section. |
1509 | // We need to subtract the size of the GOT section to get | |
1510 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1511 | bool have_got_offset = false; |
1512 | unsigned int got_offset = 0; | |
1513 | switch (r_type) | |
1514 | { | |
1515 | case elfcpp::R_386_GOT32: | |
1516 | if (gsym != NULL) | |
1517 | { | |
1518 | gold_assert(gsym->has_got_offset()); | |
96f2030e | 1519 | got_offset = gsym->got_offset() - target->got_size(); |
1b64748b ILT |
1520 | } |
1521 | else | |
1522 | { | |
1523 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
07f397ab | 1524 | gold_assert(object->local_has_got_offset(r_sym)); |
96f2030e | 1525 | got_offset = object->local_got_offset(r_sym) - target->got_size(); |
1b64748b ILT |
1526 | } |
1527 | have_got_offset = true; | |
1528 | break; | |
1529 | ||
1530 | default: | |
1531 | break; | |
1532 | } | |
1533 | ||
61ba1cf9 ILT |
1534 | switch (r_type) |
1535 | { | |
1536 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1537 | case elfcpp::R_386_GNU_VTINHERIT: |
1538 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1539 | break; |
1540 | ||
1541 | case elfcpp::R_386_32: | |
d61c6bd4 | 1542 | if (should_apply_static_reloc(gsym, true, false, true)) |
86849f1f | 1543 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1544 | break; |
1545 | ||
1546 | case elfcpp::R_386_PC32: | |
d61c6bd4 ILT |
1547 | { |
1548 | bool is_function_call = (gsym != NULL | |
1549 | && gsym->type() == elfcpp::STT_FUNC); | |
1550 | if (should_apply_static_reloc(gsym, false, is_function_call, true)) | |
1551 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1552 | } | |
92e059d8 ILT |
1553 | break; |
1554 | ||
1555 | case elfcpp::R_386_16: | |
d61c6bd4 | 1556 | if (should_apply_static_reloc(gsym, true, false, false)) |
86849f1f | 1557 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1558 | break; |
1559 | ||
1560 | case elfcpp::R_386_PC16: | |
d61c6bd4 ILT |
1561 | { |
1562 | bool is_function_call = (gsym != NULL | |
1563 | && gsym->type() == elfcpp::STT_FUNC); | |
1564 | if (should_apply_static_reloc(gsym, false, is_function_call, false)) | |
1565 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1566 | } | |
61ba1cf9 ILT |
1567 | break; |
1568 | ||
92e059d8 | 1569 | case elfcpp::R_386_8: |
d61c6bd4 | 1570 | if (should_apply_static_reloc(gsym, true, false, false)) |
86849f1f | 1571 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1572 | break; |
1573 | ||
1574 | case elfcpp::R_386_PC8: | |
d61c6bd4 ILT |
1575 | { |
1576 | bool is_function_call = (gsym != NULL | |
1577 | && gsym->type() == elfcpp::STT_FUNC); | |
1578 | if (should_apply_static_reloc(gsym, false, is_function_call, false)) | |
1579 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
1580 | } | |
92e059d8 ILT |
1581 | break; |
1582 | ||
ead1e424 | 1583 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1584 | gold_assert(gsym == NULL |
1585 | || gsym->has_plt_offset() | |
1586 | || gsym->final_value_is_known()); | |
b8e6aad9 | 1587 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1588 | break; |
1589 | ||
1590 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1591 | gold_assert(have_got_offset); |
1592 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1593 | break; |
1594 | ||
1595 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1596 | { |
1597 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1598 | value = (psymval->value(object, 0) | |
96f2030e | 1599 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1600 | Relocate_functions<32, false>::rel32(view, value); |
1601 | } | |
ead1e424 ILT |
1602 | break; |
1603 | ||
1604 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1605 | { |
1606 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1607 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1608 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1609 | } | |
ead1e424 ILT |
1610 | break; |
1611 | ||
92e059d8 ILT |
1612 | case elfcpp::R_386_COPY: |
1613 | case elfcpp::R_386_GLOB_DAT: | |
1614 | case elfcpp::R_386_JUMP_SLOT: | |
1615 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1616 | // These are outstanding tls relocs, which are unexpected when |
1617 | // linking. | |
92e059d8 ILT |
1618 | case elfcpp::R_386_TLS_TPOFF: |
1619 | case elfcpp::R_386_TLS_DTPMOD32: | |
1620 | case elfcpp::R_386_TLS_DTPOFF32: | |
1621 | case elfcpp::R_386_TLS_TPOFF32: | |
1622 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1623 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1624 | _("unexpected reloc %u in object file"), | |
1625 | r_type); | |
92e059d8 ILT |
1626 | break; |
1627 | ||
d61c17ea ILT |
1628 | // These are initial tls relocs, which are expected when |
1629 | // linking. | |
56622147 ILT |
1630 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1631 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1632 | case elfcpp::R_386_TLS_DESC_CALL: | |
1633 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1634 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1635 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1636 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1637 | case elfcpp::R_386_TLS_GOTIE: |
1638 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1639 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1640 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1641 | view, address, view_size); | |
92e059d8 ILT |
1642 | break; |
1643 | ||
92e059d8 ILT |
1644 | case elfcpp::R_386_32PLT: |
1645 | case elfcpp::R_386_TLS_GD_32: | |
1646 | case elfcpp::R_386_TLS_GD_PUSH: | |
1647 | case elfcpp::R_386_TLS_GD_CALL: | |
1648 | case elfcpp::R_386_TLS_GD_POP: | |
1649 | case elfcpp::R_386_TLS_LDM_32: | |
1650 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1651 | case elfcpp::R_386_TLS_LDM_CALL: | |
1652 | case elfcpp::R_386_TLS_LDM_POP: | |
1653 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1654 | default: |
75f2446e ILT |
1655 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1656 | _("unsupported reloc %u"), | |
1657 | r_type); | |
92e059d8 ILT |
1658 | break; |
1659 | } | |
ead1e424 ILT |
1660 | |
1661 | return true; | |
92e059d8 ILT |
1662 | } |
1663 | ||
1664 | // Perform a TLS relocation. | |
1665 | ||
1666 | inline void | |
1667 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1668 | Target_i386* target, |
92e059d8 ILT |
1669 | size_t relnum, |
1670 | const elfcpp::Rel<32, false>& rel, | |
1671 | unsigned int r_type, | |
c06b7b0b | 1672 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1673 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1674 | unsigned char* view, |
1675 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1676 | section_size_type view_size) |
92e059d8 ILT |
1677 | { |
1678 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1679 | |
07f397ab ILT |
1680 | const Sized_relobj<32, false>* object = relinfo->object; |
1681 | ||
1682 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1683 | |
a3ad94ed | 1684 | const bool is_final = (gsym == NULL |
436ca963 | 1685 | ? !parameters->output_is_position_independent() |
7e1edb90 | 1686 | : gsym->final_value_is_known()); |
af6359d5 ILT |
1687 | const tls::Tls_optimization optimized_type |
1688 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1689 | switch (r_type) |
1690 | { | |
56622147 | 1691 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1692 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1693 | { |
07f397ab | 1694 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1695 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1696 | rel, r_type, value, view, | |
1697 | view_size); | |
92e059d8 ILT |
1698 | break; |
1699 | } | |
07f397ab ILT |
1700 | else |
1701 | { | |
1702 | unsigned int got_offset; | |
1703 | if (gsym != NULL) | |
1704 | { | |
1705 | gold_assert(gsym->has_tls_got_offset(true)); | |
1706 | got_offset = gsym->tls_got_offset(true) - target->got_size(); | |
1707 | } | |
1708 | else | |
1709 | { | |
1710 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1711 | gold_assert(object->local_has_tls_got_offset(r_sym, true)); | |
1712 | got_offset = (object->local_tls_got_offset(r_sym, true) | |
1713 | - target->got_size()); | |
1714 | } | |
1715 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1716 | { | |
1717 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1718 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1719 | got_offset, view, view_size); | |
07f397ab ILT |
1720 | break; |
1721 | } | |
1722 | else if (optimized_type == tls::TLSOPT_NONE) | |
1723 | { | |
1724 | // Relocate the field with the offset of the pair of GOT | |
1725 | // entries. | |
1726 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1727 | break; | |
1728 | } | |
1729 | } | |
75f2446e ILT |
1730 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1731 | _("unsupported reloc %u"), | |
1732 | r_type); | |
92e059d8 ILT |
1733 | break; |
1734 | ||
56622147 ILT |
1735 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1736 | case elfcpp::R_386_TLS_DESC_CALL: | |
75f2446e ILT |
1737 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1738 | _("unsupported reloc %u"), | |
1739 | r_type); | |
ead1e424 ILT |
1740 | break; |
1741 | ||
56622147 | 1742 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1743 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1744 | { | |
75f2446e ILT |
1745 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1746 | _("both SUN and GNU model " | |
1747 | "TLS relocations")); | |
1748 | break; | |
46cf9fa2 ILT |
1749 | } |
1750 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1751 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1752 | { |
07f397ab | 1753 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1754 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1755 | value, view, view_size); | |
1756 | break; | |
1757 | } | |
07f397ab ILT |
1758 | else if (optimized_type == tls::TLSOPT_NONE) |
1759 | { | |
1760 | // Relocate the field with the offset of the GOT entry for | |
1761 | // the module index. | |
1762 | unsigned int got_offset; | |
94c4710f ILT |
1763 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1764 | - target->got_size()); | |
07f397ab ILT |
1765 | Relocate_functions<32, false>::rel32(view, got_offset); |
1766 | break; | |
1767 | } | |
75f2446e ILT |
1768 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1769 | _("unsupported reloc %u"), | |
1770 | r_type); | |
46cf9fa2 ILT |
1771 | break; |
1772 | ||
56622147 | 1773 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1774 | // This reloc can appear in debugging sections, in which case we |
1775 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1776 | // tells us this. | |
94c4710f ILT |
1777 | if (optimized_type == tls::TLSOPT_TO_LE) |
1778 | { | |
1779 | gold_assert(tls_segment != NULL); | |
1780 | value -= tls_segment->memsz(); | |
1781 | } | |
46cf9fa2 ILT |
1782 | Relocate_functions<32, false>::rel32(view, value); |
1783 | break; | |
1784 | ||
56622147 ILT |
1785 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1786 | case elfcpp::R_386_TLS_GOTIE: | |
1787 | case elfcpp::R_386_TLS_IE_32: | |
1788 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1789 | { | |
07f397ab | 1790 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1791 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1792 | rel, r_type, value, view, | |
1793 | view_size); | |
1794 | break; | |
1795 | } | |
07f397ab ILT |
1796 | else if (optimized_type == tls::TLSOPT_NONE) |
1797 | { | |
1798 | // Relocate the field with the offset of the GOT entry for | |
1799 | // the tp-relative offset of the symbol. | |
1800 | unsigned int got_offset; | |
1801 | if (gsym != NULL) | |
1802 | { | |
1803 | gold_assert(gsym->has_got_offset()); | |
1804 | got_offset = gsym->got_offset(); | |
1805 | } | |
1806 | else | |
1807 | { | |
1808 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1809 | gold_assert(object->local_has_got_offset(r_sym)); | |
1810 | got_offset = object->local_got_offset(r_sym); | |
1811 | } | |
1812 | // For the R_386_TLS_IE relocation, we need to apply the | |
1813 | // absolute address of the GOT entry. | |
1814 | if (r_type == elfcpp::R_386_TLS_IE) | |
1815 | got_offset += target->got_plt_section()->address(); | |
1816 | // All GOT offsets are relative to the end of the GOT. | |
1817 | got_offset -= target->got_size(); | |
1818 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1819 | break; | |
1820 | } | |
75f2446e ILT |
1821 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1822 | _("unsupported reloc %u"), | |
1823 | r_type); | |
92e059d8 | 1824 | break; |
92e059d8 | 1825 | |
56622147 | 1826 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
1827 | // If we're creating a shared library, a dynamic relocation will |
1828 | // have been created for this location, so do not apply it now. | |
1829 | if (!parameters->output_is_shared()) | |
1830 | { | |
1831 | gold_assert(tls_segment != NULL); | |
1832 | value -= tls_segment->memsz(); | |
1833 | Relocate_functions<32, false>::rel32(view, value); | |
1834 | } | |
56622147 | 1835 | break; |
92e059d8 | 1836 | |
56622147 | 1837 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
1838 | // If we're creating a shared library, a dynamic relocation will |
1839 | // have been created for this location, so do not apply it now. | |
1840 | if (!parameters->output_is_shared()) | |
1841 | { | |
1842 | gold_assert(tls_segment != NULL); | |
1843 | value = tls_segment->memsz() - value; | |
1844 | Relocate_functions<32, false>::rel32(view, value); | |
1845 | } | |
56622147 | 1846 | break; |
92e059d8 | 1847 | } |
92e059d8 ILT |
1848 | } |
1849 | ||
e041f13d | 1850 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1851 | // Local-Exec. |
1852 | ||
1853 | inline void | |
1854 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1855 | size_t relnum, | |
1856 | Output_segment* tls_segment, | |
1857 | const elfcpp::Rel<32, false>& rel, | |
1858 | unsigned int, | |
1859 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1860 | unsigned char* view, | |
fe8718a4 | 1861 | section_size_type view_size) |
ead1e424 ILT |
1862 | { |
1863 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 1864 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
1865 | // leal foo(%reg),%eax; call ___tls_get_addr |
1866 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
1867 | ||
af6359d5 ILT |
1868 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1869 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
1870 | |
1871 | unsigned char op1 = view[-1]; | |
1872 | unsigned char op2 = view[-2]; | |
1873 | ||
af6359d5 ILT |
1874 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1875 | op2 == 0x8d || op2 == 0x04); | |
1876 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
1877 | |
1878 | int roff = 5; | |
1879 | ||
1880 | if (op2 == 0x04) | |
1881 | { | |
af6359d5 ILT |
1882 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
1883 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1884 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1885 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
1886 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
1887 | } | |
1888 | else | |
1889 | { | |
af6359d5 ILT |
1890 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1891 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 1892 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 1893 | && view[9] == 0x90) |
ead1e424 ILT |
1894 | { |
1895 | // There is a trailing nop. Use the size byte subl. | |
1896 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1897 | roff = 6; | |
1898 | } | |
1899 | else | |
1900 | { | |
1901 | // Use the five byte subl. | |
1902 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1903 | } | |
1904 | } | |
1905 | ||
7bf1f802 | 1906 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
1907 | Relocate_functions<32, false>::rel32(view + roff, value); |
1908 | ||
1909 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1910 | // We can skip it. | |
1911 | this->skip_call_tls_get_addr_ = true; | |
1912 | } | |
1913 | ||
7bf1f802 | 1914 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
1915 | // Initial-Exec. |
1916 | ||
1917 | inline void | |
1918 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
1919 | size_t relnum, | |
1920 | Output_segment* tls_segment, | |
1921 | const elfcpp::Rel<32, false>& rel, | |
1922 | unsigned int, | |
1923 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1924 | unsigned char* view, | |
fe8718a4 | 1925 | section_size_type view_size) |
07f397ab ILT |
1926 | { |
1927 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
1928 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
1929 | ||
1930 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
1931 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
1932 | ||
1933 | unsigned char op1 = view[-1]; | |
1934 | unsigned char op2 = view[-2]; | |
1935 | ||
1936 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1937 | op2 == 0x8d || op2 == 0x04); | |
1938 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
1939 | ||
1940 | int roff = 5; | |
1941 | ||
1942 | // FIXME: For now, support only one form. | |
1943 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1944 | op1 == 0x8d && op2 == 0x04); | |
1945 | ||
1946 | if (op2 == 0x04) | |
1947 | { | |
1948 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
1949 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1950 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1951 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
1952 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
1953 | } | |
1954 | else | |
1955 | { | |
1956 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1957 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 1958 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
1959 | && view[9] == 0x90) |
1960 | { | |
1961 | // FIXME: This is not the right instruction sequence. | |
1962 | // There is a trailing nop. Use the size byte subl. | |
1963 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1964 | roff = 6; | |
1965 | } | |
1966 | else | |
1967 | { | |
1968 | // FIXME: This is not the right instruction sequence. | |
1969 | // Use the five byte subl. | |
1970 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1971 | } | |
1972 | } | |
1973 | ||
7bf1f802 | 1974 | value = tls_segment->memsz() - value; |
07f397ab ILT |
1975 | Relocate_functions<32, false>::rel32(view + roff, value); |
1976 | ||
1977 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1978 | // We can skip it. | |
1979 | this->skip_call_tls_get_addr_ = true; | |
1980 | } | |
1981 | ||
46cf9fa2 ILT |
1982 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
1983 | // Local-Exec. | |
1984 | ||
1985 | inline void | |
1986 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
1987 | size_t relnum, | |
1988 | Output_segment*, | |
1989 | const elfcpp::Rel<32, false>& rel, | |
1990 | unsigned int, | |
1991 | elfcpp::Elf_types<32>::Elf_Addr, | |
1992 | unsigned char* view, | |
fe8718a4 | 1993 | section_size_type view_size) |
46cf9fa2 ILT |
1994 | { |
1995 | // leal foo(%reg), %eax; call ___tls_get_addr | |
1996 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
1997 | ||
af6359d5 ILT |
1998 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1999 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2000 | |
2001 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2002 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2003 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2004 | |
af6359d5 | 2005 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2006 | |
2007 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2008 | ||
2009 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2010 | // We can skip it. | |
2011 | this->skip_call_tls_get_addr_ = true; | |
2012 | } | |
2013 | ||
56622147 ILT |
2014 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2015 | // Local-Exec. | |
2016 | ||
2017 | inline void | |
2018 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2019 | size_t relnum, | |
2020 | Output_segment* tls_segment, | |
2021 | const elfcpp::Rel<32, false>& rel, | |
2022 | unsigned int r_type, | |
2023 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2024 | unsigned char* view, | |
fe8718a4 | 2025 | section_size_type view_size) |
56622147 ILT |
2026 | { |
2027 | // We have to actually change the instructions, which means that we | |
2028 | // need to examine the opcodes to figure out which instruction we | |
2029 | // are looking at. | |
2030 | if (r_type == elfcpp::R_386_TLS_IE) | |
2031 | { | |
2032 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2033 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2034 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2035 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2036 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2037 | ||
2038 | unsigned char op1 = view[-1]; | |
2039 | if (op1 == 0xa1) | |
2040 | { | |
2041 | // movl XX,%eax ==> movl $YY,%eax | |
2042 | view[-1] = 0xb8; | |
2043 | } | |
2044 | else | |
2045 | { | |
2046 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2047 | ||
2048 | unsigned char op2 = view[-2]; | |
2049 | if (op2 == 0x8b) | |
2050 | { | |
2051 | // movl XX,%reg ==> movl $YY,%reg | |
2052 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2053 | (op1 & 0xc7) == 0x05); | |
2054 | view[-2] = 0xc7; | |
2055 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2056 | } | |
2057 | else if (op2 == 0x03) | |
2058 | { | |
2059 | // addl XX,%reg ==> addl $YY,%reg | |
2060 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2061 | (op1 & 0xc7) == 0x05); | |
2062 | view[-2] = 0x81; | |
2063 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2064 | } | |
2065 | else | |
2066 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2067 | } | |
2068 | } | |
2069 | else | |
2070 | { | |
2071 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2072 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2073 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2074 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2075 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2076 | ||
2077 | unsigned char op1 = view[-1]; | |
2078 | unsigned char op2 = view[-2]; | |
2079 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2080 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2081 | if (op2 == 0x8b) | |
2082 | { | |
2083 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2084 | view[-2] = 0xc7; | |
2085 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2086 | } | |
2087 | else if (op2 == 0x2b) | |
2088 | { | |
2089 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2090 | view[-2] = 0x81; | |
2091 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2092 | } | |
2093 | else if (op2 == 0x03) | |
2094 | { | |
2095 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2096 | view[-2] = 0x81; | |
2097 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2098 | } | |
2099 | else | |
2100 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2101 | } | |
2102 | ||
7bf1f802 | 2103 | value = tls_segment->memsz() - value; |
56622147 ILT |
2104 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2105 | value = - value; | |
2106 | ||
2107 | Relocate_functions<32, false>::rel32(view, value); | |
2108 | } | |
2109 | ||
61ba1cf9 ILT |
2110 | // Relocate section data. |
2111 | ||
2112 | void | |
92e059d8 | 2113 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2114 | unsigned int sh_type, |
2115 | const unsigned char* prelocs, | |
2116 | size_t reloc_count, | |
730cdc88 ILT |
2117 | Output_section* output_section, |
2118 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2119 | unsigned char* view, |
2120 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2121 | section_size_type view_size) |
61ba1cf9 | 2122 | { |
a3ad94ed | 2123 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2124 | |
ead1e424 ILT |
2125 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2126 | Target_i386::Relocate>( | |
92e059d8 | 2127 | relinfo, |
ead1e424 | 2128 | this, |
61ba1cf9 ILT |
2129 | prelocs, |
2130 | reloc_count, | |
730cdc88 ILT |
2131 | output_section, |
2132 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2133 | view, |
2134 | address, | |
2135 | view_size); | |
2136 | } | |
2137 | ||
ab5c9e90 ILT |
2138 | // Return the value to use for a dynamic which requires special |
2139 | // treatment. This is how we support equality comparisons of function | |
2140 | // pointers across shared library boundaries, as described in the | |
2141 | // processor specific ABI supplement. | |
2142 | ||
2143 | uint64_t | |
2144 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2145 | { | |
2146 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2147 | return this->plt_section()->address() + gsym->plt_offset(); | |
2148 | } | |
2149 | ||
c51e6221 ILT |
2150 | // Return a string used to fill a code section with nops to take up |
2151 | // the specified length. | |
2152 | ||
2153 | std::string | |
fe8718a4 | 2154 | Target_i386::do_code_fill(section_size_type length) |
c51e6221 ILT |
2155 | { |
2156 | if (length >= 16) | |
2157 | { | |
2158 | // Build a jmp instruction to skip over the bytes. | |
2159 | unsigned char jmp[5]; | |
2160 | jmp[0] = 0xe9; | |
2161 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2162 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2163 | + std::string(length - 5, '\0')); | |
2164 | } | |
2165 | ||
2166 | // Nop sequences of various lengths. | |
2167 | const char nop1[1] = { 0x90 }; // nop | |
2168 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2169 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2170 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2171 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2172 | 0x00 }; // leal 0(%esi,1),%esi | |
2173 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2174 | 0x00, 0x00 }; | |
2175 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2176 | 0x00, 0x00, 0x00 }; | |
2177 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2178 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2179 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2180 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2181 | 0x00 }; | |
2182 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2183 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2184 | 0x00, 0x00 }; | |
2185 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2186 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2187 | 0x00, 0x00, 0x00 }; | |
2188 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2189 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2190 | 0x00, 0x00, 0x00, 0x00 }; | |
2191 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2192 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2193 | 0x27, 0x00, 0x00, 0x00, | |
2194 | 0x00 }; | |
2195 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2196 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2197 | 0xbc, 0x27, 0x00, 0x00, | |
2198 | 0x00, 0x00 }; | |
2199 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2200 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2201 | 0x90, 0x90, 0x90, 0x90, | |
2202 | 0x90, 0x90, 0x90 }; | |
2203 | ||
2204 | const char* nops[16] = { | |
2205 | NULL, | |
2206 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2207 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2208 | }; | |
2209 | ||
2210 | return std::string(nops[length], length); | |
2211 | } | |
2212 | ||
14bfc3f5 ILT |
2213 | // The selector for i386 object files. |
2214 | ||
2215 | class Target_selector_i386 : public Target_selector | |
2216 | { | |
2217 | public: | |
2218 | Target_selector_i386() | |
2219 | : Target_selector(elfcpp::EM_386, 32, false) | |
2220 | { } | |
2221 | ||
2222 | Target* | |
ead1e424 ILT |
2223 | recognize(int machine, int osabi, int abiversion); |
2224 | ||
2225 | private: | |
2226 | Target_i386* target_; | |
14bfc3f5 ILT |
2227 | }; |
2228 | ||
2229 | // Recognize an i386 object file when we already know that the machine | |
2230 | // number is EM_386. | |
2231 | ||
2232 | Target* | |
ead1e424 | 2233 | Target_selector_i386::recognize(int, int, int) |
14bfc3f5 | 2234 | { |
ead1e424 ILT |
2235 | if (this->target_ == NULL) |
2236 | this->target_ = new Target_i386(); | |
2237 | return this->target_; | |
14bfc3f5 ILT |
2238 | } |
2239 | ||
2240 | Target_selector_i386 target_selector_i386; | |
2241 | ||
2242 | } // End anonymous namespace. |