Commit | Line | Data |
---|---|---|
14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
14bfc3f5 | 23 | #include "gold.h" |
ead1e424 ILT |
24 | |
25 | #include <cstring> | |
26 | ||
14bfc3f5 | 27 | #include "elfcpp.h" |
7e1edb90 | 28 | #include "parameters.h" |
92e059d8 | 29 | #include "reloc.h" |
61ba1cf9 ILT |
30 | #include "i386.h" |
31 | #include "object.h" | |
ead1e424 | 32 | #include "symtab.h" |
92e059d8 ILT |
33 | #include "layout.h" |
34 | #include "output.h" | |
14bfc3f5 | 35 | #include "target.h" |
61ba1cf9 | 36 | #include "target-reloc.h" |
14bfc3f5 | 37 | #include "target-select.h" |
af6359d5 | 38 | #include "tls.h" |
14bfc3f5 ILT |
39 | |
40 | namespace | |
41 | { | |
42 | ||
43 | using namespace gold; | |
44 | ||
a3ad94ed ILT |
45 | class Output_data_plt_i386; |
46 | ||
14bfc3f5 | 47 | // The i386 target class. |
e041f13d ILT |
48 | // TLS info comes from |
49 | // http://people.redhat.com/drepper/tls.pdf | |
50 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 ILT |
51 | |
52 | class Target_i386 : public Sized_target<32, false> | |
53 | { | |
54 | public: | |
5a6f7e2d ILT |
55 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
56 | ||
14bfc3f5 | 57 | Target_i386() |
ead1e424 | 58 | : Sized_target<32, false>(&i386_info), |
5a6f7e2d | 59 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
94c4710f | 60 | copy_relocs_(NULL), dynbss_(NULL), got_mod_index_offset_(-1U) |
14bfc3f5 | 61 | { } |
75f65a3e | 62 | |
92e059d8 | 63 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 64 | void |
92e059d8 ILT |
65 | scan_relocs(const General_options& options, |
66 | Symbol_table* symtab, | |
ead1e424 | 67 | Layout* layout, |
f6ce93d6 | 68 | Sized_relobj<32, false>* object, |
a3ad94ed | 69 | unsigned int data_shndx, |
92e059d8 ILT |
70 | unsigned int sh_type, |
71 | const unsigned char* prelocs, | |
72 | size_t reloc_count, | |
730cdc88 ILT |
73 | Output_section* output_section, |
74 | bool needs_special_offset_handling, | |
92e059d8 | 75 | size_t local_symbol_count, |
730cdc88 | 76 | const unsigned char* plocal_symbols); |
61ba1cf9 | 77 | |
5a6f7e2d ILT |
78 | // Finalize the sections. |
79 | void | |
7e1edb90 | 80 | do_finalize_sections(Layout*); |
5a6f7e2d | 81 | |
ab5c9e90 ILT |
82 | // Return the value to use for a dynamic which requires special |
83 | // treatment. | |
84 | uint64_t | |
85 | do_dynsym_value(const Symbol*) const; | |
86 | ||
92e059d8 ILT |
87 | // Relocate a section. |
88 | void | |
89 | relocate_section(const Relocate_info<32, false>*, | |
90 | unsigned int sh_type, | |
91 | const unsigned char* prelocs, | |
92 | size_t reloc_count, | |
730cdc88 ILT |
93 | Output_section* output_section, |
94 | bool needs_special_offset_handling, | |
92e059d8 ILT |
95 | unsigned char* view, |
96 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
fe8718a4 | 97 | section_size_type view_size); |
92e059d8 | 98 | |
6a74a719 ILT |
99 | // Scan the relocs during a relocatable link. |
100 | void | |
101 | scan_relocatable_relocs(const General_options& options, | |
102 | Symbol_table* symtab, | |
103 | Layout* layout, | |
104 | Sized_relobj<32, false>* object, | |
105 | unsigned int data_shndx, | |
106 | unsigned int sh_type, | |
107 | const unsigned char* prelocs, | |
108 | size_t reloc_count, | |
109 | Output_section* output_section, | |
110 | bool needs_special_offset_handling, | |
111 | size_t local_symbol_count, | |
112 | const unsigned char* plocal_symbols, | |
113 | Relocatable_relocs*); | |
114 | ||
115 | // Relocate a section during a relocatable link. | |
116 | void | |
117 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
118 | unsigned int sh_type, | |
119 | const unsigned char* prelocs, | |
120 | size_t reloc_count, | |
121 | Output_section* output_section, | |
122 | off_t offset_in_output_section, | |
123 | const Relocatable_relocs*, | |
124 | unsigned char* view, | |
125 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
126 | section_size_type view_size, | |
127 | unsigned char* reloc_view, | |
128 | section_size_type reloc_view_size); | |
129 | ||
c51e6221 ILT |
130 | // Return a string used to fill a code section with nops. |
131 | std::string | |
8851ecca | 132 | do_code_fill(section_size_type length) const; |
c51e6221 | 133 | |
9a2d6984 ILT |
134 | // Return whether SYM is defined by the ABI. |
135 | bool | |
136 | do_is_defined_by_abi(Symbol* sym) const | |
137 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } | |
138 | ||
96f2030e | 139 | // Return the size of the GOT section. |
fe8718a4 | 140 | section_size_type |
96f2030e ILT |
141 | got_size() |
142 | { | |
143 | gold_assert(this->got_ != NULL); | |
144 | return this->got_->data_size(); | |
145 | } | |
146 | ||
92e059d8 ILT |
147 | private: |
148 | // The class which scans relocations. | |
149 | struct Scan | |
61ba1cf9 ILT |
150 | { |
151 | inline void | |
ead1e424 ILT |
152 | local(const General_options& options, Symbol_table* symtab, |
153 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 154 | Sized_relobj<32, false>* object, |
a3ad94ed | 155 | unsigned int data_shndx, |
07f397ab | 156 | Output_section* output_section, |
92e059d8 ILT |
157 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
158 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 159 | |
92e059d8 | 160 | inline void |
ead1e424 ILT |
161 | global(const General_options& options, Symbol_table* symtab, |
162 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 163 | Sized_relobj<32, false>* object, |
a3ad94ed | 164 | unsigned int data_shndx, |
07f397ab | 165 | Output_section* output_section, |
92e059d8 ILT |
166 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
167 | Symbol* gsym); | |
af6359d5 ILT |
168 | |
169 | static void | |
170 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
171 | ||
172 | static void | |
173 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
174 | Symbol*); | |
61ba1cf9 ILT |
175 | }; |
176 | ||
92e059d8 ILT |
177 | // The class which implements relocation. |
178 | class Relocate | |
179 | { | |
180 | public: | |
ead1e424 | 181 | Relocate() |
46cf9fa2 ILT |
182 | : skip_call_tls_get_addr_(false), |
183 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
184 | { } |
185 | ||
186 | ~Relocate() | |
187 | { | |
188 | if (this->skip_call_tls_get_addr_) | |
189 | { | |
190 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 191 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
192 | } |
193 | } | |
194 | ||
86849f1f ILT |
195 | // Return whether the static relocation needs to be applied. |
196 | inline bool | |
197 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 198 | int ref_flags, |
86849f1f ILT |
199 | bool is_32bit); |
200 | ||
ead1e424 ILT |
201 | // Do a relocation. Return false if the caller should not issue |
202 | // any warnings about this relocation. | |
203 | inline bool | |
204 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 205 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 206 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 207 | const Symbol_value<32>*, |
92e059d8 | 208 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 209 | section_size_type); |
92e059d8 ILT |
210 | |
211 | private: | |
212 | // Do a TLS relocation. | |
ead1e424 | 213 | inline void |
07f397ab ILT |
214 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
215 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 216 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 217 | const Symbol_value<32>*, |
fe8718a4 ILT |
218 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
219 | section_size_type); | |
92e059d8 | 220 | |
07f397ab ILT |
221 | // Do a TLS General-Dynamic to Initial-Exec transition. |
222 | inline void | |
223 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
224 | Output_segment* tls_segment, | |
225 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
226 | elfcpp::Elf_types<32>::Elf_Addr value, | |
227 | unsigned char* view, | |
fe8718a4 | 228 | section_size_type view_size); |
07f397ab | 229 | |
56622147 ILT |
230 | // Do a TLS General-Dynamic to Local-Exec transition. |
231 | inline void | |
232 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
233 | Output_segment* tls_segment, |
234 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
235 | elfcpp::Elf_types<32>::Elf_Addr value, | |
236 | unsigned char* view, | |
fe8718a4 | 237 | section_size_type view_size); |
92e059d8 | 238 | |
56622147 | 239 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 240 | inline void |
56622147 | 241 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
242 | Output_segment* tls_segment, |
243 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
244 | elfcpp::Elf_types<32>::Elf_Addr value, | |
245 | unsigned char* view, | |
fe8718a4 | 246 | section_size_type view_size); |
ead1e424 | 247 | |
56622147 ILT |
248 | // Do a TLS Initial-Exec to Local-Exec transition. |
249 | static inline void | |
250 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
251 | Output_segment* tls_segment, |
252 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
253 | elfcpp::Elf_types<32>::Elf_Addr value, | |
254 | unsigned char* view, | |
fe8718a4 | 255 | section_size_type view_size); |
46cf9fa2 | 256 | |
46cf9fa2 ILT |
257 | // We need to keep track of which type of local dynamic relocation |
258 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
259 | enum Local_dynamic_type | |
260 | { | |
261 | LOCAL_DYNAMIC_NONE, | |
262 | LOCAL_DYNAMIC_SUN, | |
263 | LOCAL_DYNAMIC_GNU | |
264 | }; | |
265 | ||
ead1e424 ILT |
266 | // This is set if we should skip the next reloc, which should be a |
267 | // PLT32 reloc against ___tls_get_addr. | |
268 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
269 | // The type of local dynamic relocation we have seen in the section |
270 | // being relocated, if any. | |
271 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
272 | }; |
273 | ||
6a74a719 ILT |
274 | // A class which returns the size required for a relocation type, |
275 | // used while scanning relocs during a relocatable link. | |
276 | class Relocatable_size_for_reloc | |
277 | { | |
278 | public: | |
279 | unsigned int | |
280 | get_size_for_reloc(unsigned int, Relobj*); | |
281 | }; | |
282 | ||
92e059d8 ILT |
283 | // Adjust TLS relocation type based on the options and whether this |
284 | // is a local symbol. | |
af6359d5 | 285 | static tls::Tls_optimization |
7e1edb90 | 286 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 287 | |
ead1e424 | 288 | // Get the GOT section, creating it if necessary. |
dbe717ef | 289 | Output_data_got<32, false>* |
7e1edb90 | 290 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 291 | |
96f2030e ILT |
292 | // Get the GOT PLT section. |
293 | Output_data_space* | |
294 | got_plt_section() const | |
295 | { | |
296 | gold_assert(this->got_plt_ != NULL); | |
297 | return this->got_plt_; | |
298 | } | |
299 | ||
a3ad94ed ILT |
300 | // Create a PLT entry for a global symbol. |
301 | void | |
7e1edb90 | 302 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 303 | |
94c4710f ILT |
304 | // Create a GOT entry for the TLS module index. |
305 | unsigned int | |
306 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
307 | Sized_relobj<32, false>* object); | |
308 | ||
a3ad94ed | 309 | // Get the PLT section. |
7bb3655e | 310 | const Output_data_plt_i386* |
a3ad94ed ILT |
311 | plt_section() const |
312 | { | |
313 | gold_assert(this->plt_ != NULL); | |
314 | return this->plt_; | |
315 | } | |
316 | ||
5a6f7e2d ILT |
317 | // Get the dynamic reloc section, creating it if necessary. |
318 | Reloc_section* | |
319 | rel_dyn_section(Layout*); | |
320 | ||
d61c6bd4 ILT |
321 | // Return true if the symbol may need a COPY relocation. |
322 | // References from an executable object to non-function symbols | |
323 | // defined in a dynamic object may need a COPY relocation. | |
324 | bool | |
325 | may_need_copy_reloc(Symbol* gsym) | |
326 | { | |
8851ecca | 327 | return (!parameters->options().shared() |
d61c6bd4 ILT |
328 | && gsym->is_from_dynobj() |
329 | && gsym->type() != elfcpp::STT_FUNC); | |
330 | } | |
331 | ||
a3ad94ed ILT |
332 | // Copy a relocation against a global symbol. |
333 | void | |
5a6f7e2d ILT |
334 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
335 | Sized_relobj<32, false>*, unsigned int, | |
4f4c5f80 | 336 | Output_section*, Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 337 | |
92e059d8 ILT |
338 | // Information about this specific target which we pass to the |
339 | // general Target structure. | |
75f65a3e | 340 | static const Target::Target_info i386_info; |
ead1e424 | 341 | |
0a65a3a7 CC |
342 | // The types of GOT entries needed for this platform. |
343 | enum Got_type | |
344 | { | |
345 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
346 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
347 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
348 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
349 | }; | |
350 | ||
ead1e424 | 351 | // The GOT section. |
dbe717ef | 352 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
353 | // The PLT section. |
354 | Output_data_plt_i386* plt_; | |
355 | // The GOT PLT section. | |
356 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
357 | // The dynamic reloc section. |
358 | Reloc_section* rel_dyn_; | |
359 | // Relocs saved to avoid a COPY reloc. | |
360 | Copy_relocs<32, false>* copy_relocs_; | |
361 | // Space for variables copied with a COPY reloc. | |
362 | Output_data_space* dynbss_; | |
94c4710f ILT |
363 | // Offset of the GOT entry for the TLS module index; |
364 | unsigned int got_mod_index_offset_; | |
75f65a3e ILT |
365 | }; |
366 | ||
367 | const Target::Target_info Target_i386::i386_info = | |
368 | { | |
61ba1cf9 ILT |
369 | 32, // size |
370 | false, // is_big_endian | |
371 | elfcpp::EM_386, // machine_code | |
372 | false, // has_make_symbol | |
dbe717ef | 373 | false, // has_resolve |
c51e6221 | 374 | true, // has_code_fill |
35cdfc9a | 375 | true, // is_default_stack_executable |
0864d551 | 376 | '\0', // wrap_char |
dbe717ef | 377 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 378 | 0x08048000, // default_text_segment_address |
cd72c291 ILT |
379 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
380 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
14bfc3f5 ILT |
381 | }; |
382 | ||
ead1e424 ILT |
383 | // Get the GOT section, creating it if necessary. |
384 | ||
dbe717ef | 385 | Output_data_got<32, false>* |
7e1edb90 | 386 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
387 | { |
388 | if (this->got_ == NULL) | |
389 | { | |
7e1edb90 | 390 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 391 | |
7e1edb90 | 392 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 393 | |
ead1e424 | 394 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
395 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
396 | this->got_); | |
ead1e424 | 397 | |
a3ad94ed ILT |
398 | // The old GNU linker creates a .got.plt section. We just |
399 | // create another set of data in the .got section. Note that we | |
400 | // always create a PLT if we create a GOT, although the PLT | |
401 | // might be empty. | |
402 | this->got_plt_ = new Output_data_space(4); | |
403 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
404 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
405 | this->got_plt_); | |
a3ad94ed | 406 | |
ead1e424 | 407 | // The first three entries are reserved. |
27bc2bce | 408 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 409 | |
a3ad94ed | 410 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 411 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 412 | this->got_plt_, |
ead1e424 | 413 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 414 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
415 | elfcpp::STV_HIDDEN, 0, |
416 | false, false); | |
417 | } | |
a3ad94ed | 418 | |
ead1e424 ILT |
419 | return this->got_; |
420 | } | |
421 | ||
5a6f7e2d ILT |
422 | // Get the dynamic reloc section, creating it if necessary. |
423 | ||
424 | Target_i386::Reloc_section* | |
425 | Target_i386::rel_dyn_section(Layout* layout) | |
426 | { | |
427 | if (this->rel_dyn_ == NULL) | |
428 | { | |
429 | gold_assert(layout != NULL); | |
430 | this->rel_dyn_ = new Reloc_section(); | |
431 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
432 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
433 | } | |
434 | return this->rel_dyn_; | |
435 | } | |
436 | ||
a3ad94ed ILT |
437 | // A class to handle the PLT data. |
438 | ||
439 | class Output_data_plt_i386 : public Output_section_data | |
440 | { | |
441 | public: | |
442 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
443 | ||
7e1edb90 | 444 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
445 | |
446 | // Add an entry to the PLT. | |
447 | void | |
448 | add_entry(Symbol* gsym); | |
449 | ||
16649710 ILT |
450 | // Return the .rel.plt section data. |
451 | const Reloc_section* | |
452 | rel_plt() const | |
453 | { return this->rel_; } | |
454 | ||
455 | protected: | |
456 | void | |
457 | do_adjust_output_section(Output_section* os); | |
458 | ||
a3ad94ed ILT |
459 | private: |
460 | // The size of an entry in the PLT. | |
461 | static const int plt_entry_size = 16; | |
462 | ||
463 | // The first entry in the PLT for an executable. | |
464 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
465 | ||
466 | // The first entry in the PLT for a shared object. | |
467 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
468 | ||
469 | // Other entries in the PLT for an executable. | |
470 | static unsigned char exec_plt_entry[plt_entry_size]; | |
471 | ||
472 | // Other entries in the PLT for a shared object. | |
473 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
474 | ||
475 | // Set the final size. | |
476 | void | |
27bc2bce | 477 | set_final_data_size() |
a3ad94ed ILT |
478 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
479 | ||
480 | // Write out the PLT data. | |
481 | void | |
482 | do_write(Output_file*); | |
483 | ||
484 | // The reloc section. | |
485 | Reloc_section* rel_; | |
486 | // The .got.plt section. | |
487 | Output_data_space* got_plt_; | |
488 | // The number of PLT entries. | |
489 | unsigned int count_; | |
a3ad94ed ILT |
490 | }; |
491 | ||
492 | // Create the PLT section. The ordinary .got section is an argument, | |
493 | // since we need to refer to the start. We also create our own .got | |
494 | // section just for PLT entries. | |
495 | ||
496 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 497 | Output_data_space* got_plt) |
80576242 | 498 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
499 | { |
500 | this->rel_ = new Reloc_section(); | |
501 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
502 | elfcpp::SHF_ALLOC, this->rel_); | |
503 | } | |
504 | ||
16649710 ILT |
505 | void |
506 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
507 | { | |
508 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
509 | // linker, and so do we. | |
510 | os->set_entsize(4); | |
511 | } | |
512 | ||
a3ad94ed ILT |
513 | // Add an entry to the PLT. |
514 | ||
515 | void | |
516 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
517 | { | |
518 | gold_assert(!gsym->has_plt_offset()); | |
519 | ||
520 | // Note that when setting the PLT offset we skip the initial | |
521 | // reserved PLT entry. | |
522 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
523 | ||
524 | ++this->count_; | |
525 | ||
fe8718a4 | 526 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
527 | |
528 | // Every PLT entry needs a GOT entry which points back to the PLT | |
529 | // entry (this will be changed by the dynamic linker, normally | |
530 | // lazily when the function is called). | |
27bc2bce | 531 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
532 | |
533 | // Every PLT entry needs a reloc. | |
16649710 | 534 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
535 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
536 | got_offset); | |
537 | ||
538 | // Note that we don't need to save the symbol. The contents of the | |
539 | // PLT are independent of which symbols are used. The symbols only | |
540 | // appear in the relocations. | |
541 | } | |
542 | ||
543 | // The first entry in the PLT for an executable. | |
544 | ||
545 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
546 | { | |
547 | 0xff, 0x35, // pushl contents of memory address | |
548 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
549 | 0xff, 0x25, // jmp indirect | |
550 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
551 | 0, 0, 0, 0 // unused | |
552 | }; | |
553 | ||
554 | // The first entry in the PLT for a shared object. | |
555 | ||
556 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
557 | { | |
558 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
559 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
560 | 0, 0, 0, 0 // unused | |
561 | }; | |
562 | ||
563 | // Subsequent entries in the PLT for an executable. | |
564 | ||
565 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
566 | { | |
567 | 0xff, 0x25, // jmp indirect | |
568 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
569 | 0x68, // pushl immediate | |
570 | 0, 0, 0, 0, // replaced with offset into relocation table | |
571 | 0xe9, // jmp relative | |
572 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
573 | }; | |
574 | ||
575 | // Subsequent entries in the PLT for a shared object. | |
576 | ||
577 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
578 | { | |
579 | 0xff, 0xa3, // jmp *offset(%ebx) | |
580 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
581 | 0x68, // pushl immediate | |
582 | 0, 0, 0, 0, // replaced with offset into relocation table | |
583 | 0xe9, // jmp relative | |
584 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
585 | }; | |
586 | ||
587 | // Write out the PLT. This uses the hand-coded instructions above, | |
588 | // and adjusts them as needed. This is all specified by the i386 ELF | |
589 | // Processor Supplement. | |
590 | ||
591 | void | |
592 | Output_data_plt_i386::do_write(Output_file* of) | |
593 | { | |
594 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
595 | const section_size_type oview_size = |
596 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
597 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
598 | ||
599 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
600 | const section_size_type got_size = |
601 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
602 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
603 | got_size); | |
604 | ||
605 | unsigned char* pov = oview; | |
606 | ||
607 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
608 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
609 | ||
8851ecca | 610 | if (parameters->options().shared()) |
a3ad94ed ILT |
611 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
612 | else | |
613 | { | |
614 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
615 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
616 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
617 | } | |
618 | pov += plt_entry_size; | |
619 | ||
620 | unsigned char* got_pov = got_view; | |
621 | ||
622 | memset(got_pov, 0, 12); | |
623 | got_pov += 12; | |
624 | ||
625 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
626 | ||
627 | unsigned int plt_offset = plt_entry_size; | |
628 | unsigned int plt_rel_offset = 0; | |
629 | unsigned int got_offset = 12; | |
630 | const unsigned int count = this->count_; | |
631 | for (unsigned int i = 0; | |
632 | i < count; | |
633 | ++i, | |
634 | pov += plt_entry_size, | |
635 | got_pov += 4, | |
636 | plt_offset += plt_entry_size, | |
637 | plt_rel_offset += rel_size, | |
638 | got_offset += 4) | |
639 | { | |
640 | // Set and adjust the PLT entry itself. | |
641 | ||
8851ecca | 642 | if (parameters->options().shared()) |
a3ad94ed ILT |
643 | { |
644 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
645 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
646 | } | |
647 | else | |
648 | { | |
649 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
650 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
651 | (got_address | |
652 | + got_offset)); | |
653 | } | |
654 | ||
655 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
656 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
657 | - (plt_offset + plt_entry_size)); | |
658 | ||
659 | // Set the entry in the GOT. | |
660 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
661 | } | |
662 | ||
fe8718a4 ILT |
663 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
664 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
665 | |
666 | of->write_output_view(offset, oview_size, oview); | |
667 | of->write_output_view(got_file_offset, got_size, got_view); | |
668 | } | |
669 | ||
670 | // Create a PLT entry for a global symbol. | |
671 | ||
672 | void | |
7e1edb90 | 673 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
674 | { |
675 | if (gsym->has_plt_offset()) | |
676 | return; | |
677 | ||
678 | if (this->plt_ == NULL) | |
679 | { | |
680 | // Create the GOT sections first. | |
7e1edb90 | 681 | this->got_section(symtab, layout); |
a3ad94ed | 682 | |
7e1edb90 | 683 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
684 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
685 | (elfcpp::SHF_ALLOC | |
686 | | elfcpp::SHF_EXECINSTR), | |
687 | this->plt_); | |
a3ad94ed ILT |
688 | } |
689 | ||
690 | this->plt_->add_entry(gsym); | |
691 | } | |
692 | ||
94c4710f ILT |
693 | // Create a GOT entry for the TLS module index. |
694 | ||
695 | unsigned int | |
696 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
697 | Sized_relobj<32, false>* object) | |
698 | { | |
699 | if (this->got_mod_index_offset_ == -1U) | |
700 | { | |
701 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
702 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
703 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
704 | unsigned int got_offset = got->add_constant(0); | |
705 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
706 | got_offset); | |
707 | got->add_constant(0); | |
708 | this->got_mod_index_offset_ = got_offset; | |
709 | } | |
710 | return this->got_mod_index_offset_; | |
711 | } | |
712 | ||
a3ad94ed ILT |
713 | // Handle a relocation against a non-function symbol defined in a |
714 | // dynamic object. The traditional way to handle this is to generate | |
715 | // a COPY relocation to copy the variable at runtime from the shared | |
716 | // object into the executable's data segment. However, this is | |
717 | // undesirable in general, as if the size of the object changes in the | |
718 | // dynamic object, the executable will no longer work correctly. If | |
719 | // this relocation is in a writable section, then we can create a | |
720 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
721 | // address at runtime. However, we do not want do that if the | |
722 | // relocation is in a read-only section, as it would prevent the | |
723 | // readonly segment from being shared. And if we have to eventually | |
724 | // generate a COPY reloc, then any dynamic relocations will be | |
725 | // useless. So this means that if this is a writable section, we need | |
726 | // to save the relocation until we see whether we have to create a | |
727 | // COPY relocation for this symbol for any other relocation. | |
728 | ||
729 | void | |
730 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
731 | Symbol_table* symtab, |
732 | Layout* layout, | |
a3ad94ed | 733 | Sized_relobj<32, false>* object, |
4f4c5f80 ILT |
734 | unsigned int data_shndx, |
735 | Output_section* output_section, | |
736 | Symbol* gsym, | |
5a6f7e2d | 737 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 738 | { |
7d1a9ebb | 739 | Sized_symbol<32>* ssym = symtab->get_sized_symbol<32>(gsym); |
5a6f7e2d ILT |
740 | |
741 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
742 | data_shndx, ssym)) | |
a3ad94ed ILT |
743 | { |
744 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
745 | // If it turns out that we never need a COPY reloc for this |
746 | // symbol, then we will emit the relocation. | |
747 | if (this->copy_relocs_ == NULL) | |
748 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
4f4c5f80 | 749 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rel); |
a3ad94ed | 750 | } |
5a6f7e2d ILT |
751 | else |
752 | { | |
753 | // Allocate space for this symbol in the .bss section. | |
754 | ||
755 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
756 | ||
757 | // There is no defined way to determine the required alignment | |
758 | // of the symbol. We pick the alignment based on the size. We | |
759 | // set an arbitrary maximum of 256. | |
760 | unsigned int align; | |
761 | for (align = 1; align < 512; align <<= 1) | |
762 | if ((symsize & align) != 0) | |
763 | break; | |
a3ad94ed | 764 | |
5a6f7e2d ILT |
765 | if (this->dynbss_ == NULL) |
766 | { | |
767 | this->dynbss_ = new Output_data_space(align); | |
768 | layout->add_output_section_data(".bss", | |
769 | elfcpp::SHT_NOBITS, | |
770 | (elfcpp::SHF_ALLOC | |
771 | | elfcpp::SHF_WRITE), | |
772 | this->dynbss_); | |
773 | } | |
774 | ||
775 | Output_data_space* dynbss = this->dynbss_; | |
776 | ||
777 | if (align > dynbss->addralign()) | |
778 | dynbss->set_space_alignment(align); | |
779 | ||
fe8718a4 ILT |
780 | section_size_type dynbss_size = |
781 | convert_to_section_size_type(dynbss->current_data_size()); | |
5a6f7e2d | 782 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 783 | section_size_type offset = dynbss_size; |
27bc2bce | 784 | dynbss->set_current_data_size(dynbss_size + symsize); |
5a6f7e2d | 785 | |
9b07f471 | 786 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
5a6f7e2d ILT |
787 | |
788 | // Add the COPY reloc. | |
789 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
790 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
791 | } | |
a3ad94ed ILT |
792 | } |
793 | ||
92e059d8 | 794 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
795 | // symbol. IS_FINAL is true if the final address of this symbol is |
796 | // known at link time. | |
92e059d8 | 797 | |
af6359d5 | 798 | tls::Tls_optimization |
7e1edb90 | 799 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
800 | { |
801 | // If we are generating a shared library, then we can't do anything | |
802 | // in the linker. | |
8851ecca | 803 | if (parameters->options().shared()) |
af6359d5 | 804 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
805 | |
806 | switch (r_type) | |
807 | { | |
808 | case elfcpp::R_386_TLS_GD: | |
809 | case elfcpp::R_386_TLS_GOTDESC: | |
810 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 811 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
812 | // access. Since we know that we are generating an executable, |
813 | // we can convert this to Initial-Exec. If we also know that | |
814 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 815 | if (is_final) |
af6359d5 ILT |
816 | return tls::TLSOPT_TO_LE; |
817 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
818 | |
819 | case elfcpp::R_386_TLS_LDM: | |
820 | // This is Local-Dynamic, which refers to a local symbol in the | |
821 | // dynamic TLS block. Since we know that we generating an | |
822 | // executable, we can switch to Local-Exec. | |
af6359d5 | 823 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
824 | |
825 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
826 | // Another type of Local-Dynamic relocation. |
827 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
828 | |
829 | case elfcpp::R_386_TLS_IE: | |
830 | case elfcpp::R_386_TLS_GOTIE: | |
831 | case elfcpp::R_386_TLS_IE_32: | |
832 | // These are Initial-Exec relocs which get the thread offset | |
833 | // from the GOT. If we know that we are linking against the | |
834 | // local symbol, we can switch to Local-Exec, which links the | |
835 | // thread offset into the instruction. | |
a3ad94ed | 836 | if (is_final) |
af6359d5 ILT |
837 | return tls::TLSOPT_TO_LE; |
838 | return tls::TLSOPT_NONE; | |
8462ae85 | 839 | |
92e059d8 ILT |
840 | case elfcpp::R_386_TLS_LE: |
841 | case elfcpp::R_386_TLS_LE_32: | |
842 | // When we already have Local-Exec, there is nothing further we | |
843 | // can do. | |
af6359d5 | 844 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
845 | |
846 | default: | |
a3ad94ed | 847 | gold_unreachable(); |
92e059d8 ILT |
848 | } |
849 | } | |
850 | ||
af6359d5 ILT |
851 | // Report an unsupported relocation against a local symbol. |
852 | ||
853 | void | |
854 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
855 | unsigned int r_type) | |
856 | { | |
75f2446e ILT |
857 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
858 | object->name().c_str(), r_type); | |
af6359d5 ILT |
859 | } |
860 | ||
92e059d8 ILT |
861 | // Scan a relocation for a local symbol. |
862 | ||
863 | inline void | |
7e1edb90 | 864 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
865 | Symbol_table* symtab, |
866 | Layout* layout, | |
867 | Target_i386* target, | |
f6ce93d6 | 868 | Sized_relobj<32, false>* object, |
1b64748b | 869 | unsigned int data_shndx, |
07f397ab | 870 | Output_section* output_section, |
1b64748b | 871 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 872 | unsigned int r_type, |
7bf1f802 | 873 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
874 | { |
875 | switch (r_type) | |
876 | { | |
877 | case elfcpp::R_386_NONE: | |
878 | case elfcpp::R_386_GNU_VTINHERIT: | |
879 | case elfcpp::R_386_GNU_VTENTRY: | |
880 | break; | |
881 | ||
882 | case elfcpp::R_386_32: | |
436ca963 ILT |
883 | // If building a shared library (or a position-independent |
884 | // executable), we need to create a dynamic relocation for | |
885 | // this location. The relocation applied at link time will | |
886 | // apply the link-time value, so we flag the location with | |
887 | // an R_386_RELATIVE relocation so the dynamic loader can | |
888 | // relocate it easily. | |
8851ecca | 889 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
890 | { |
891 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
892 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
893 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
894 | output_section, data_shndx, | |
895 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
896 | } |
897 | break; | |
898 | ||
899 | case elfcpp::R_386_16: | |
900 | case elfcpp::R_386_8: | |
901 | // If building a shared library (or a position-independent | |
902 | // executable), we need to create a dynamic relocation for | |
903 | // this location. Because the addend needs to remain in the | |
904 | // data section, we need to be careful not to apply this | |
905 | // relocation statically. | |
8851ecca | 906 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
907 | { |
908 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
dceae3c1 ILT |
909 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
910 | { | |
911 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
912 | rel_dyn->add_local(object, r_sym, r_type, output_section, | |
913 | data_shndx, reloc.get_r_offset()); | |
914 | } | |
915 | else | |
916 | { | |
917 | gold_assert(lsym.get_st_value() == 0); | |
918 | rel_dyn->add_local_section(object, lsym.get_st_shndx(), | |
919 | r_type, output_section, | |
920 | data_shndx, reloc.get_r_offset()); | |
921 | } | |
436ca963 | 922 | } |
92e059d8 ILT |
923 | break; |
924 | ||
925 | case elfcpp::R_386_PC32: | |
926 | case elfcpp::R_386_PC16: | |
927 | case elfcpp::R_386_PC8: | |
928 | break; | |
929 | ||
df2efe71 ILT |
930 | case elfcpp::R_386_PLT32: |
931 | // Since we know this is a local symbol, we can handle this as a | |
932 | // PC32 reloc. | |
933 | break; | |
934 | ||
ead1e424 ILT |
935 | case elfcpp::R_386_GOTOFF: |
936 | case elfcpp::R_386_GOTPC: | |
937 | // We need a GOT section. | |
7e1edb90 | 938 | target->got_section(symtab, layout); |
ead1e424 ILT |
939 | break; |
940 | ||
1b64748b ILT |
941 | case elfcpp::R_386_GOT32: |
942 | { | |
943 | // The symbol requires a GOT entry. | |
944 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
945 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 946 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
947 | { |
948 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 949 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 950 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
951 | { |
952 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 953 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
954 | rel_dyn->add_local_relative( |
955 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
956 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
957 | } |
958 | } | |
959 | } | |
960 | break; | |
961 | ||
af6359d5 ILT |
962 | // These are relocations which should only be seen by the |
963 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
964 | case elfcpp::R_386_COPY: |
965 | case elfcpp::R_386_GLOB_DAT: | |
966 | case elfcpp::R_386_JUMP_SLOT: | |
967 | case elfcpp::R_386_RELATIVE: | |
968 | case elfcpp::R_386_TLS_TPOFF: | |
969 | case elfcpp::R_386_TLS_DTPMOD32: | |
970 | case elfcpp::R_386_TLS_DTPOFF32: | |
971 | case elfcpp::R_386_TLS_TPOFF32: | |
972 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 973 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 974 | object->name().c_str(), r_type); |
92e059d8 ILT |
975 | break; |
976 | ||
af6359d5 | 977 | // These are initial TLS relocs, which are expected when |
d61c17ea | 978 | // linking. |
56622147 ILT |
979 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
980 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
981 | case elfcpp::R_386_TLS_DESC_CALL: | |
982 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
983 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
984 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 985 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
986 | case elfcpp::R_386_TLS_GOTIE: |
987 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 988 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 989 | { |
8851ecca | 990 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
991 | const tls::Tls_optimization optimized_type |
992 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
993 | switch (r_type) |
994 | { | |
56622147 | 995 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
996 | if (optimized_type == tls::TLSOPT_NONE) |
997 | { | |
998 | // Create a pair of GOT entries for the module index and | |
999 | // dtv-relative offset. | |
1000 | Output_data_got<32, false>* got | |
1001 | = target->got_section(symtab, layout); | |
1002 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 CC |
1003 | got->add_local_pair_with_rel(object, r_sym, |
1004 | lsym.get_st_shndx(), | |
1005 | GOT_TYPE_TLS_PAIR, | |
1006 | target->rel_dyn_section(layout), | |
1007 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1008 | } |
1009 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1010 | unsupported_reloc_local(object, r_type); | |
1011 | break; | |
1012 | ||
56622147 ILT |
1013 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
1014 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
1015 | // FIXME: If not relaxing to LE, we need to generate |
1016 | // a GOT entry with an R_386_TLS_DESC reloc. | |
1017 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1018 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1019 | break; |
1020 | ||
56622147 | 1021 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1022 | if (optimized_type == tls::TLSOPT_NONE) |
1023 | { | |
1024 | // Create a GOT entry for the module index. | |
94c4710f | 1025 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1026 | } |
1027 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1028 | unsupported_reloc_local(object, r_type); |
1029 | break; | |
1030 | ||
56622147 | 1031 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1032 | break; |
1033 | ||
56622147 ILT |
1034 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1035 | case elfcpp::R_386_TLS_IE_32: | |
1036 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1037 | layout->set_has_static_tls(); |
07f397ab ILT |
1038 | if (optimized_type == tls::TLSOPT_NONE) |
1039 | { | |
7bf1f802 ILT |
1040 | // For the R_386_TLS_IE relocation, we need to create a |
1041 | // dynamic relocation when building a shared library. | |
1042 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1043 | && parameters->options().shared()) |
7bf1f802 ILT |
1044 | { |
1045 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1046 | unsigned int r_sym |
1047 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1048 | rel_dyn->add_local_relative(object, r_sym, | |
1049 | elfcpp::R_386_RELATIVE, | |
1050 | output_section, data_shndx, | |
1051 | reloc.get_r_offset()); | |
7bf1f802 | 1052 | } |
07f397ab ILT |
1053 | // Create a GOT entry for the tp-relative offset. |
1054 | Output_data_got<32, false>* got | |
1055 | = target->got_section(symtab, layout); | |
1056 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1057 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1058 | ? elfcpp::R_386_TLS_TPOFF32 | |
1059 | : elfcpp::R_386_TLS_TPOFF); | |
0a65a3a7 | 1060 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1061 | target->rel_dyn_section(layout), |
1062 | dyn_r_type); | |
07f397ab ILT |
1063 | } |
1064 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1065 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1066 | break; |
af6359d5 | 1067 | |
56622147 ILT |
1068 | case elfcpp::R_386_TLS_LE: // Local-exec |
1069 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1070 | layout->set_has_static_tls(); |
07f397ab | 1071 | if (output_is_shared) |
7bf1f802 ILT |
1072 | { |
1073 | // We need to create a dynamic relocation. | |
dceae3c1 | 1074 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1075 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1076 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1077 | ? elfcpp::R_386_TLS_TPOFF32 | |
1078 | : elfcpp::R_386_TLS_TPOFF); | |
1079 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1080 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1081 | data_shndx, reloc.get_r_offset()); | |
1082 | } | |
56622147 ILT |
1083 | break; |
1084 | ||
af6359d5 ILT |
1085 | default: |
1086 | gold_unreachable(); | |
7e1edb90 ILT |
1087 | } |
1088 | } | |
92e059d8 ILT |
1089 | break; |
1090 | ||
92e059d8 ILT |
1091 | case elfcpp::R_386_32PLT: |
1092 | case elfcpp::R_386_TLS_GD_32: | |
1093 | case elfcpp::R_386_TLS_GD_PUSH: | |
1094 | case elfcpp::R_386_TLS_GD_CALL: | |
1095 | case elfcpp::R_386_TLS_GD_POP: | |
1096 | case elfcpp::R_386_TLS_LDM_32: | |
1097 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1098 | case elfcpp::R_386_TLS_LDM_CALL: | |
1099 | case elfcpp::R_386_TLS_LDM_POP: | |
1100 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1101 | default: | |
af6359d5 | 1102 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1103 | break; |
1104 | } | |
1105 | } | |
1106 | ||
af6359d5 ILT |
1107 | // Report an unsupported relocation against a global symbol. |
1108 | ||
1109 | void | |
1110 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1111 | unsigned int r_type, | |
1112 | Symbol* gsym) | |
1113 | { | |
75f2446e | 1114 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1115 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1116 | } |
1117 | ||
92e059d8 ILT |
1118 | // Scan a relocation for a global symbol. |
1119 | ||
1120 | inline void | |
1121 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
1122 | Symbol_table* symtab, |
1123 | Layout* layout, | |
1124 | Target_i386* target, | |
f6ce93d6 | 1125 | Sized_relobj<32, false>* object, |
a3ad94ed | 1126 | unsigned int data_shndx, |
07f397ab | 1127 | Output_section* output_section, |
a3ad94ed ILT |
1128 | const elfcpp::Rel<32, false>& reloc, |
1129 | unsigned int r_type, | |
92e059d8 ILT |
1130 | Symbol* gsym) |
1131 | { | |
1132 | switch (r_type) | |
1133 | { | |
1134 | case elfcpp::R_386_NONE: | |
1135 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1136 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1137 | break; |
1138 | ||
1139 | case elfcpp::R_386_32: | |
92e059d8 | 1140 | case elfcpp::R_386_16: |
92e059d8 | 1141 | case elfcpp::R_386_8: |
96f2030e | 1142 | { |
d61c6bd4 ILT |
1143 | // Make a PLT entry if necessary. |
1144 | if (gsym->needs_plt_entry()) | |
1145 | { | |
1146 | target->make_plt_entry(symtab, layout, gsym); | |
1147 | // Since this is not a PC-relative relocation, we may be | |
1148 | // taking the address of a function. In that case we need to | |
1149 | // set the entry in the dynamic symbol table to the address of | |
1150 | // the PLT entry. | |
8851ecca | 1151 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1152 | gsym->set_needs_dynsym_value(); |
1153 | } | |
1154 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1155 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1156 | { |
1157 | if (target->may_need_copy_reloc(gsym)) | |
1158 | { | |
07f397ab | 1159 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1160 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1161 | } |
1162 | else if (r_type == elfcpp::R_386_32 | |
1163 | && gsym->can_use_relative_reloc(false)) | |
1164 | { | |
1165 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1166 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1167 | output_section, object, | |
1168 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1169 | } |
1170 | else | |
1171 | { | |
96f2030e | 1172 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1173 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1174 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1175 | } |
1176 | } | |
1177 | } | |
1178 | break; | |
1179 | ||
1180 | case elfcpp::R_386_PC32: | |
1181 | case elfcpp::R_386_PC16: | |
1182 | case elfcpp::R_386_PC8: | |
1183 | { | |
1184 | // Make a PLT entry if necessary. | |
1185 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1186 | { |
1187 | // These relocations are used for function calls only in | |
1188 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1189 | // we'll need a text relocation anyway, so we can skip the | |
1190 | // PLT entry and let the dynamic linker bind the call directly | |
1191 | // to the target. For smaller relocations, we should use a | |
1192 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1193 | if (!parameters->options().shared() |
7bf1f802 ILT |
1194 | || r_type != elfcpp::R_386_PC32) |
1195 | target->make_plt_entry(symtab, layout, gsym); | |
1196 | } | |
d61c6bd4 | 1197 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1198 | int flags = Symbol::NON_PIC_REF; |
1199 | if (gsym->type() == elfcpp::STT_FUNC) | |
1200 | flags |= Symbol::FUNCTION_CALL; | |
1201 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1202 | { |
d61c6bd4 ILT |
1203 | if (target->may_need_copy_reloc(gsym)) |
1204 | { | |
07f397ab | 1205 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1206 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1207 | } |
86849f1f | 1208 | else |
d61c6bd4 ILT |
1209 | { |
1210 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1211 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1212 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1213 | } |
96f2030e ILT |
1214 | } |
1215 | } | |
92e059d8 ILT |
1216 | break; |
1217 | ||
ead1e424 | 1218 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1219 | { |
1220 | // The symbol requires a GOT entry. | |
7e1edb90 | 1221 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1222 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1223 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1224 | else |
1225 | { | |
8462ae85 | 1226 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1227 | // GOT entry with a dynamic relocation. |
1228 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1229 | if (gsym->is_from_dynobj() |
1230 | || gsym->is_undefined() | |
1231 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1232 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1233 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1234 | else |
8462ae85 | 1235 | { |
0a65a3a7 CC |
1236 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1237 | rel_dyn->add_global_relative( | |
1238 | gsym, elfcpp::R_386_RELATIVE, got, | |
1239 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1240 | } |
1241 | } | |
1242 | } | |
ead1e424 ILT |
1243 | break; |
1244 | ||
1245 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1246 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1247 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1248 | if (gsym->final_value_is_known()) |
ead1e424 | 1249 | break; |
436ca963 ILT |
1250 | // If building a shared library, we can also skip the PLT entry |
1251 | // if the symbol is defined in the output file and is protected | |
1252 | // or hidden. | |
1253 | if (gsym->is_defined() | |
1254 | && !gsym->is_from_dynobj() | |
1255 | && !gsym->is_preemptible()) | |
1256 | break; | |
7e1edb90 | 1257 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1258 | break; |
1259 | ||
1260 | case elfcpp::R_386_GOTOFF: | |
1261 | case elfcpp::R_386_GOTPC: | |
1262 | // We need a GOT section. | |
7e1edb90 | 1263 | target->got_section(symtab, layout); |
ead1e424 ILT |
1264 | break; |
1265 | ||
af6359d5 ILT |
1266 | // These are relocations which should only be seen by the |
1267 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1268 | case elfcpp::R_386_COPY: |
1269 | case elfcpp::R_386_GLOB_DAT: | |
1270 | case elfcpp::R_386_JUMP_SLOT: | |
1271 | case elfcpp::R_386_RELATIVE: | |
1272 | case elfcpp::R_386_TLS_TPOFF: | |
1273 | case elfcpp::R_386_TLS_DTPMOD32: | |
1274 | case elfcpp::R_386_TLS_DTPOFF32: | |
1275 | case elfcpp::R_386_TLS_TPOFF32: | |
1276 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1277 | gold_error(_("%s: unexpected reloc %u in object file"), |
1278 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1279 | break; |
1280 | ||
d61c17ea ILT |
1281 | // These are initial tls relocs, which are expected when |
1282 | // linking. | |
56622147 ILT |
1283 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1284 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1285 | case elfcpp::R_386_TLS_DESC_CALL: | |
1286 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1287 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1288 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1289 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1290 | case elfcpp::R_386_TLS_GOTIE: |
1291 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1292 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1293 | { |
7e1edb90 | 1294 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1295 | const tls::Tls_optimization optimized_type |
1296 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1297 | switch (r_type) |
1298 | { | |
56622147 | 1299 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1300 | if (optimized_type == tls::TLSOPT_NONE) |
1301 | { | |
1302 | // Create a pair of GOT entries for the module index and | |
1303 | // dtv-relative offset. | |
1304 | Output_data_got<32, false>* got | |
1305 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1306 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1307 | target->rel_dyn_section(layout), |
1308 | elfcpp::R_386_TLS_DTPMOD32, | |
1309 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1310 | } |
1311 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1312 | { | |
1313 | // Create a GOT entry for the tp-relative offset. | |
1314 | Output_data_got<32, false>* got | |
1315 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1316 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
1317 | target->rel_dyn_section(layout), | |
7bf1f802 | 1318 | elfcpp::R_386_TLS_TPOFF32); |
07f397ab ILT |
1319 | } |
1320 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1321 | unsupported_reloc_global(object, r_type, gsym); | |
1322 | break; | |
1323 | ||
56622147 ILT |
1324 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
1325 | case elfcpp::R_386_TLS_DESC_CALL: | |
7bf1f802 ILT |
1326 | // FIXME: If not relaxing to LE, we need to generate |
1327 | // a GOT entry with an R_386_TLS_DESC reloc. | |
1328 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1329 | unsupported_reloc_global(object, r_type, gsym); | |
07f397ab | 1330 | unsupported_reloc_global(object, r_type, gsym); |
af6359d5 ILT |
1331 | break; |
1332 | ||
56622147 | 1333 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1334 | if (optimized_type == tls::TLSOPT_NONE) |
1335 | { | |
1336 | // Create a GOT entry for the module index. | |
94c4710f | 1337 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1338 | } |
1339 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1340 | unsupported_reloc_global(object, r_type, gsym); |
1341 | break; | |
1342 | ||
56622147 | 1343 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1344 | break; |
1345 | ||
56622147 ILT |
1346 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1347 | case elfcpp::R_386_TLS_IE_32: | |
1348 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1349 | layout->set_has_static_tls(); |
07f397ab ILT |
1350 | if (optimized_type == tls::TLSOPT_NONE) |
1351 | { | |
7bf1f802 ILT |
1352 | // For the R_386_TLS_IE relocation, we need to create a |
1353 | // dynamic relocation when building a shared library. | |
1354 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1355 | && parameters->options().shared()) |
07f397ab | 1356 | { |
07f397ab | 1357 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1358 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1359 | output_section, object, | |
1360 | data_shndx, | |
1361 | reloc.get_r_offset()); | |
07f397ab | 1362 | } |
7bf1f802 ILT |
1363 | // Create a GOT entry for the tp-relative offset. |
1364 | Output_data_got<32, false>* got | |
1365 | = target->got_section(symtab, layout); | |
1366 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1367 | ? elfcpp::R_386_TLS_TPOFF32 | |
1368 | : elfcpp::R_386_TLS_TPOFF); | |
0a65a3a7 | 1369 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1370 | target->rel_dyn_section(layout), |
1371 | dyn_r_type); | |
07f397ab ILT |
1372 | } |
1373 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1374 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1375 | break; |
af6359d5 | 1376 | |
56622147 ILT |
1377 | case elfcpp::R_386_TLS_LE: // Local-exec |
1378 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1379 | layout->set_has_static_tls(); |
8851ecca | 1380 | if (parameters->options().shared()) |
7bf1f802 ILT |
1381 | { |
1382 | // We need to create a dynamic relocation. | |
1383 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1384 | ? elfcpp::R_386_TLS_TPOFF32 | |
1385 | : elfcpp::R_386_TLS_TPOFF); | |
1386 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1387 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1388 | data_shndx, reloc.get_r_offset()); | |
1389 | } | |
56622147 ILT |
1390 | break; |
1391 | ||
af6359d5 ILT |
1392 | default: |
1393 | gold_unreachable(); | |
a3ad94ed ILT |
1394 | } |
1395 | } | |
92e059d8 ILT |
1396 | break; |
1397 | ||
92e059d8 ILT |
1398 | case elfcpp::R_386_32PLT: |
1399 | case elfcpp::R_386_TLS_GD_32: | |
1400 | case elfcpp::R_386_TLS_GD_PUSH: | |
1401 | case elfcpp::R_386_TLS_GD_CALL: | |
1402 | case elfcpp::R_386_TLS_GD_POP: | |
1403 | case elfcpp::R_386_TLS_LDM_32: | |
1404 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1405 | case elfcpp::R_386_TLS_LDM_CALL: | |
1406 | case elfcpp::R_386_TLS_LDM_POP: | |
1407 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1408 | default: | |
af6359d5 | 1409 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1410 | break; |
1411 | } | |
1412 | } | |
1413 | ||
1414 | // Scan relocations for a section. | |
1415 | ||
1416 | void | |
1417 | Target_i386::scan_relocs(const General_options& options, | |
1418 | Symbol_table* symtab, | |
ead1e424 | 1419 | Layout* layout, |
f6ce93d6 | 1420 | Sized_relobj<32, false>* object, |
a3ad94ed | 1421 | unsigned int data_shndx, |
92e059d8 ILT |
1422 | unsigned int sh_type, |
1423 | const unsigned char* prelocs, | |
1424 | size_t reloc_count, | |
730cdc88 ILT |
1425 | Output_section* output_section, |
1426 | bool needs_special_offset_handling, | |
92e059d8 | 1427 | size_t local_symbol_count, |
730cdc88 | 1428 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1429 | { |
1430 | if (sh_type == elfcpp::SHT_RELA) | |
1431 | { | |
75f2446e ILT |
1432 | gold_error(_("%s: unsupported RELA reloc section"), |
1433 | object->name().c_str()); | |
1434 | return; | |
92e059d8 ILT |
1435 | } |
1436 | ||
ead1e424 ILT |
1437 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1438 | Target_i386::Scan>( | |
92e059d8 ILT |
1439 | options, |
1440 | symtab, | |
ead1e424 ILT |
1441 | layout, |
1442 | this, | |
92e059d8 | 1443 | object, |
a3ad94ed | 1444 | data_shndx, |
92e059d8 ILT |
1445 | prelocs, |
1446 | reloc_count, | |
730cdc88 ILT |
1447 | output_section, |
1448 | needs_special_offset_handling, | |
92e059d8 | 1449 | local_symbol_count, |
730cdc88 | 1450 | plocal_symbols); |
92e059d8 ILT |
1451 | } |
1452 | ||
16649710 | 1453 | // Finalize the sections. |
5a6f7e2d ILT |
1454 | |
1455 | void | |
7e1edb90 | 1456 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1457 | { |
16649710 ILT |
1458 | // Fill in some more dynamic tags. |
1459 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1460 | if (odyn != NULL) | |
1461 | { | |
1462 | if (this->got_plt_ != NULL) | |
1463 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1464 | ||
1465 | if (this->plt_ != NULL) | |
1466 | { | |
1467 | const Output_data* od = this->plt_->rel_plt(); | |
1468 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1469 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1470 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1471 | } | |
1472 | ||
1473 | if (this->rel_dyn_ != NULL) | |
1474 | { | |
1475 | const Output_data* od = this->rel_dyn_; | |
1476 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1477 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1478 | odyn->add_constant(elfcpp::DT_RELENT, | |
1479 | elfcpp::Elf_sizes<32>::rel_size); | |
1480 | } | |
1481 | ||
8851ecca | 1482 | if (!parameters->options().shared()) |
16649710 ILT |
1483 | { |
1484 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1485 | // linker at run time, and used by the debugger. | |
1486 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1491 | // relocs. | |
5a6f7e2d ILT |
1492 | if (this->copy_relocs_ == NULL) |
1493 | return; | |
1494 | if (this->copy_relocs_->any_to_emit()) | |
1495 | { | |
1496 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1497 | this->copy_relocs_->emit(rel_dyn); | |
1498 | } | |
1499 | delete this->copy_relocs_; | |
1500 | this->copy_relocs_ = NULL; | |
1501 | } | |
1502 | ||
86849f1f ILT |
1503 | // Return whether a direct absolute static relocation needs to be applied. |
1504 | // In cases where Scan::local() or Scan::global() has created | |
1505 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1506 | // of the relocation is carried in the data, and we must not | |
1507 | // apply the static relocation. | |
1508 | ||
1509 | inline bool | |
1510 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1511 | int ref_flags, |
86849f1f ILT |
1512 | bool is_32bit) |
1513 | { | |
d61c6bd4 ILT |
1514 | // For local symbols, we will have created a non-RELATIVE dynamic |
1515 | // relocation only if (a) the output is position independent, | |
1516 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1517 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1518 | if (gsym == NULL) |
8851ecca | 1519 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1520 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1521 | && !is_32bit); |
86849f1f | 1522 | |
0700cf32 ILT |
1523 | // For global symbols, we use the same helper routines used in the |
1524 | // scan pass. If we did not create a dynamic relocation, or if we | |
1525 | // created a RELATIVE dynamic relocation, we should apply the static | |
1526 | // relocation. | |
1527 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1528 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1529 | && gsym->can_use_relative_reloc(ref_flags | |
1530 | & Symbol::FUNCTION_CALL); | |
1531 | return !has_dyn || is_rel; | |
86849f1f ILT |
1532 | } |
1533 | ||
61ba1cf9 ILT |
1534 | // Perform a relocation. |
1535 | ||
ead1e424 | 1536 | inline bool |
92e059d8 | 1537 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1538 | Target_i386* target, |
92e059d8 ILT |
1539 | size_t relnum, |
1540 | const elfcpp::Rel<32, false>& rel, | |
1541 | unsigned int r_type, | |
c06b7b0b | 1542 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1543 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1544 | unsigned char* view, |
1545 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1546 | section_size_type view_size) |
61ba1cf9 | 1547 | { |
ead1e424 ILT |
1548 | if (this->skip_call_tls_get_addr_) |
1549 | { | |
1550 | if (r_type != elfcpp::R_386_PLT32 | |
1551 | || gsym == NULL | |
1552 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1553 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1554 | _("missing expected TLS relocation")); | |
1555 | else | |
ead1e424 | 1556 | { |
75f2446e ILT |
1557 | this->skip_call_tls_get_addr_ = false; |
1558 | return false; | |
ead1e424 | 1559 | } |
ead1e424 ILT |
1560 | } |
1561 | ||
a3ad94ed | 1562 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1563 | Symbol_value<32> symval; |
0700cf32 ILT |
1564 | bool is_nonpic = (r_type == elfcpp::R_386_PC8 |
1565 | || r_type == elfcpp::R_386_PC16 | |
1566 | || r_type == elfcpp::R_386_PC32); | |
436ca963 ILT |
1567 | if (gsym != NULL |
1568 | && (gsym->is_from_dynobj() | |
8851ecca | 1569 | || (parameters->options().shared() |
8fc19601 | 1570 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
0700cf32 | 1571 | && gsym->has_plt_offset() |
8851ecca | 1572 | && (!is_nonpic || !parameters->options().shared())) |
a3ad94ed | 1573 | { |
b8e6aad9 ILT |
1574 | symval.set_output_value(target->plt_section()->address() |
1575 | + gsym->plt_offset()); | |
1576 | psymval = &symval; | |
a3ad94ed ILT |
1577 | } |
1578 | ||
b8e6aad9 ILT |
1579 | const Sized_relobj<32, false>* object = relinfo->object; |
1580 | ||
1b64748b | 1581 | // Get the GOT offset if needed. |
96f2030e ILT |
1582 | // The GOT pointer points to the end of the GOT section. |
1583 | // We need to subtract the size of the GOT section to get | |
1584 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1585 | bool have_got_offset = false; |
1586 | unsigned int got_offset = 0; | |
1587 | switch (r_type) | |
1588 | { | |
1589 | case elfcpp::R_386_GOT32: | |
1590 | if (gsym != NULL) | |
1591 | { | |
0a65a3a7 CC |
1592 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1593 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1594 | - target->got_size()); | |
1b64748b ILT |
1595 | } |
1596 | else | |
1597 | { | |
1598 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1599 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1600 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1601 | - target->got_size()); | |
1b64748b ILT |
1602 | } |
1603 | have_got_offset = true; | |
1604 | break; | |
1605 | ||
1606 | default: | |
1607 | break; | |
1608 | } | |
1609 | ||
61ba1cf9 ILT |
1610 | switch (r_type) |
1611 | { | |
1612 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1613 | case elfcpp::R_386_GNU_VTINHERIT: |
1614 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1615 | break; |
1616 | ||
1617 | case elfcpp::R_386_32: | |
0700cf32 | 1618 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true)) |
86849f1f | 1619 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1620 | break; |
1621 | ||
1622 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1623 | { |
0700cf32 ILT |
1624 | int ref_flags = Symbol::NON_PIC_REF; |
1625 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1626 | ref_flags |= Symbol::FUNCTION_CALL; | |
1627 | if (should_apply_static_reloc(gsym, ref_flags, true)) | |
d61c6bd4 ILT |
1628 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1629 | } | |
92e059d8 ILT |
1630 | break; |
1631 | ||
1632 | case elfcpp::R_386_16: | |
0700cf32 | 1633 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1634 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1635 | break; |
1636 | ||
1637 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1638 | { |
0700cf32 ILT |
1639 | int ref_flags = Symbol::NON_PIC_REF; |
1640 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1641 | ref_flags |= Symbol::FUNCTION_CALL; | |
1642 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1643 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1644 | } | |
61ba1cf9 ILT |
1645 | break; |
1646 | ||
92e059d8 | 1647 | case elfcpp::R_386_8: |
0700cf32 | 1648 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1649 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1650 | break; |
1651 | ||
1652 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1653 | { |
0700cf32 ILT |
1654 | int ref_flags = Symbol::NON_PIC_REF; |
1655 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1656 | ref_flags |= Symbol::FUNCTION_CALL; | |
1657 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1658 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1659 | } | |
92e059d8 ILT |
1660 | break; |
1661 | ||
ead1e424 | 1662 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1663 | gold_assert(gsym == NULL |
1664 | || gsym->has_plt_offset() | |
99f8faca ILT |
1665 | || gsym->final_value_is_known() |
1666 | || (gsym->is_defined() | |
1667 | && !gsym->is_from_dynobj() | |
1668 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1669 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1670 | break; |
1671 | ||
1672 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1673 | gold_assert(have_got_offset); |
1674 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1675 | break; |
1676 | ||
1677 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1678 | { |
1679 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1680 | value = (psymval->value(object, 0) | |
96f2030e | 1681 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1682 | Relocate_functions<32, false>::rel32(view, value); |
1683 | } | |
ead1e424 ILT |
1684 | break; |
1685 | ||
1686 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1687 | { |
1688 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1689 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1690 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1691 | } | |
ead1e424 ILT |
1692 | break; |
1693 | ||
92e059d8 ILT |
1694 | case elfcpp::R_386_COPY: |
1695 | case elfcpp::R_386_GLOB_DAT: | |
1696 | case elfcpp::R_386_JUMP_SLOT: | |
1697 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1698 | // These are outstanding tls relocs, which are unexpected when |
1699 | // linking. | |
92e059d8 ILT |
1700 | case elfcpp::R_386_TLS_TPOFF: |
1701 | case elfcpp::R_386_TLS_DTPMOD32: | |
1702 | case elfcpp::R_386_TLS_DTPOFF32: | |
1703 | case elfcpp::R_386_TLS_TPOFF32: | |
1704 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1705 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1706 | _("unexpected reloc %u in object file"), | |
1707 | r_type); | |
92e059d8 ILT |
1708 | break; |
1709 | ||
d61c17ea ILT |
1710 | // These are initial tls relocs, which are expected when |
1711 | // linking. | |
56622147 ILT |
1712 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1713 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1714 | case elfcpp::R_386_TLS_DESC_CALL: | |
1715 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1716 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1717 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1718 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1719 | case elfcpp::R_386_TLS_GOTIE: |
1720 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1721 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1722 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1723 | view, address, view_size); | |
92e059d8 ILT |
1724 | break; |
1725 | ||
92e059d8 ILT |
1726 | case elfcpp::R_386_32PLT: |
1727 | case elfcpp::R_386_TLS_GD_32: | |
1728 | case elfcpp::R_386_TLS_GD_PUSH: | |
1729 | case elfcpp::R_386_TLS_GD_CALL: | |
1730 | case elfcpp::R_386_TLS_GD_POP: | |
1731 | case elfcpp::R_386_TLS_LDM_32: | |
1732 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1733 | case elfcpp::R_386_TLS_LDM_CALL: | |
1734 | case elfcpp::R_386_TLS_LDM_POP: | |
1735 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1736 | default: |
75f2446e ILT |
1737 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1738 | _("unsupported reloc %u"), | |
1739 | r_type); | |
92e059d8 ILT |
1740 | break; |
1741 | } | |
ead1e424 ILT |
1742 | |
1743 | return true; | |
92e059d8 ILT |
1744 | } |
1745 | ||
1746 | // Perform a TLS relocation. | |
1747 | ||
1748 | inline void | |
1749 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1750 | Target_i386* target, |
92e059d8 ILT |
1751 | size_t relnum, |
1752 | const elfcpp::Rel<32, false>& rel, | |
1753 | unsigned int r_type, | |
c06b7b0b | 1754 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1755 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1756 | unsigned char* view, |
1757 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1758 | section_size_type view_size) |
92e059d8 ILT |
1759 | { |
1760 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1761 | |
07f397ab ILT |
1762 | const Sized_relobj<32, false>* object = relinfo->object; |
1763 | ||
1764 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1765 | |
8851ecca ILT |
1766 | const bool is_final = |
1767 | (gsym == NULL | |
1768 | ? !parameters->options().output_is_position_independent() | |
1769 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1770 | const tls::Tls_optimization optimized_type |
1771 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1772 | switch (r_type) |
1773 | { | |
56622147 | 1774 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1775 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1776 | { |
07f397ab | 1777 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1778 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1779 | rel, r_type, value, view, | |
1780 | view_size); | |
92e059d8 ILT |
1781 | break; |
1782 | } | |
07f397ab ILT |
1783 | else |
1784 | { | |
1785 | unsigned int got_offset; | |
1786 | if (gsym != NULL) | |
1787 | { | |
0a65a3a7 CC |
1788 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_PAIR)); |
1789 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_PAIR) | |
1790 | - target->got_size()); | |
07f397ab ILT |
1791 | } |
1792 | else | |
1793 | { | |
1794 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1795 | gold_assert(object->local_has_got_offset(r_sym, |
1796 | GOT_TYPE_TLS_PAIR)); | |
1797 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_PAIR) | |
07f397ab ILT |
1798 | - target->got_size()); |
1799 | } | |
1800 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1801 | { | |
1802 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1803 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1804 | got_offset, view, view_size); | |
07f397ab ILT |
1805 | break; |
1806 | } | |
1807 | else if (optimized_type == tls::TLSOPT_NONE) | |
1808 | { | |
1809 | // Relocate the field with the offset of the pair of GOT | |
1810 | // entries. | |
1811 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1812 | break; | |
1813 | } | |
1814 | } | |
75f2446e ILT |
1815 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1816 | _("unsupported reloc %u"), | |
1817 | r_type); | |
92e059d8 ILT |
1818 | break; |
1819 | ||
56622147 ILT |
1820 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1821 | case elfcpp::R_386_TLS_DESC_CALL: | |
75f2446e ILT |
1822 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1823 | _("unsupported reloc %u"), | |
1824 | r_type); | |
ead1e424 ILT |
1825 | break; |
1826 | ||
56622147 | 1827 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1828 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1829 | { | |
75f2446e ILT |
1830 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1831 | _("both SUN and GNU model " | |
1832 | "TLS relocations")); | |
1833 | break; | |
46cf9fa2 ILT |
1834 | } |
1835 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1836 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1837 | { |
07f397ab | 1838 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1839 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1840 | value, view, view_size); | |
1841 | break; | |
1842 | } | |
07f397ab ILT |
1843 | else if (optimized_type == tls::TLSOPT_NONE) |
1844 | { | |
1845 | // Relocate the field with the offset of the GOT entry for | |
1846 | // the module index. | |
1847 | unsigned int got_offset; | |
94c4710f ILT |
1848 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1849 | - target->got_size()); | |
07f397ab ILT |
1850 | Relocate_functions<32, false>::rel32(view, got_offset); |
1851 | break; | |
1852 | } | |
75f2446e ILT |
1853 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1854 | _("unsupported reloc %u"), | |
1855 | r_type); | |
46cf9fa2 ILT |
1856 | break; |
1857 | ||
56622147 | 1858 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1859 | // This reloc can appear in debugging sections, in which case we |
1860 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1861 | // tells us this. | |
94c4710f ILT |
1862 | if (optimized_type == tls::TLSOPT_TO_LE) |
1863 | { | |
1864 | gold_assert(tls_segment != NULL); | |
1865 | value -= tls_segment->memsz(); | |
1866 | } | |
46cf9fa2 ILT |
1867 | Relocate_functions<32, false>::rel32(view, value); |
1868 | break; | |
1869 | ||
56622147 ILT |
1870 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1871 | case elfcpp::R_386_TLS_GOTIE: | |
1872 | case elfcpp::R_386_TLS_IE_32: | |
1873 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1874 | { | |
07f397ab | 1875 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1876 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1877 | rel, r_type, value, view, | |
1878 | view_size); | |
1879 | break; | |
1880 | } | |
07f397ab ILT |
1881 | else if (optimized_type == tls::TLSOPT_NONE) |
1882 | { | |
1883 | // Relocate the field with the offset of the GOT entry for | |
1884 | // the tp-relative offset of the symbol. | |
1885 | unsigned int got_offset; | |
1886 | if (gsym != NULL) | |
1887 | { | |
0a65a3a7 CC |
1888 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
1889 | got_offset = gsym->got_offset(GOT_TYPE_TLS_OFFSET); | |
07f397ab ILT |
1890 | } |
1891 | else | |
1892 | { | |
1893 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1894 | gold_assert(object->local_has_got_offset(r_sym, |
1895 | GOT_TYPE_TLS_OFFSET)); | |
1896 | got_offset = object->local_got_offset(r_sym, | |
1897 | GOT_TYPE_TLS_OFFSET); | |
07f397ab ILT |
1898 | } |
1899 | // For the R_386_TLS_IE relocation, we need to apply the | |
1900 | // absolute address of the GOT entry. | |
1901 | if (r_type == elfcpp::R_386_TLS_IE) | |
1902 | got_offset += target->got_plt_section()->address(); | |
1903 | // All GOT offsets are relative to the end of the GOT. | |
1904 | got_offset -= target->got_size(); | |
1905 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1906 | break; | |
1907 | } | |
75f2446e ILT |
1908 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1909 | _("unsupported reloc %u"), | |
1910 | r_type); | |
92e059d8 | 1911 | break; |
92e059d8 | 1912 | |
56622147 | 1913 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
1914 | // If we're creating a shared library, a dynamic relocation will |
1915 | // have been created for this location, so do not apply it now. | |
8851ecca | 1916 | if (!parameters->options().shared()) |
7bf1f802 ILT |
1917 | { |
1918 | gold_assert(tls_segment != NULL); | |
1919 | value -= tls_segment->memsz(); | |
1920 | Relocate_functions<32, false>::rel32(view, value); | |
1921 | } | |
56622147 | 1922 | break; |
92e059d8 | 1923 | |
56622147 | 1924 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
1925 | // If we're creating a shared library, a dynamic relocation will |
1926 | // have been created for this location, so do not apply it now. | |
8851ecca | 1927 | if (!parameters->options().shared()) |
7bf1f802 ILT |
1928 | { |
1929 | gold_assert(tls_segment != NULL); | |
1930 | value = tls_segment->memsz() - value; | |
1931 | Relocate_functions<32, false>::rel32(view, value); | |
1932 | } | |
56622147 | 1933 | break; |
92e059d8 | 1934 | } |
92e059d8 ILT |
1935 | } |
1936 | ||
e041f13d | 1937 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1938 | // Local-Exec. |
1939 | ||
1940 | inline void | |
1941 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1942 | size_t relnum, | |
1943 | Output_segment* tls_segment, | |
1944 | const elfcpp::Rel<32, false>& rel, | |
1945 | unsigned int, | |
1946 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1947 | unsigned char* view, | |
fe8718a4 | 1948 | section_size_type view_size) |
ead1e424 ILT |
1949 | { |
1950 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 1951 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
1952 | // leal foo(%reg),%eax; call ___tls_get_addr |
1953 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
1954 | ||
af6359d5 ILT |
1955 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
1956 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
1957 | |
1958 | unsigned char op1 = view[-1]; | |
1959 | unsigned char op2 = view[-2]; | |
1960 | ||
af6359d5 ILT |
1961 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1962 | op2 == 0x8d || op2 == 0x04); | |
1963 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
1964 | |
1965 | int roff = 5; | |
1966 | ||
1967 | if (op2 == 0x04) | |
1968 | { | |
af6359d5 ILT |
1969 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
1970 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
1971 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
1972 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
1973 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
1974 | } | |
1975 | else | |
1976 | { | |
af6359d5 ILT |
1977 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
1978 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 1979 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 1980 | && view[9] == 0x90) |
ead1e424 ILT |
1981 | { |
1982 | // There is a trailing nop. Use the size byte subl. | |
1983 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
1984 | roff = 6; | |
1985 | } | |
1986 | else | |
1987 | { | |
1988 | // Use the five byte subl. | |
1989 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
1990 | } | |
1991 | } | |
1992 | ||
7bf1f802 | 1993 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
1994 | Relocate_functions<32, false>::rel32(view + roff, value); |
1995 | ||
1996 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1997 | // We can skip it. | |
1998 | this->skip_call_tls_get_addr_ = true; | |
1999 | } | |
2000 | ||
7bf1f802 | 2001 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2002 | // Initial-Exec. |
2003 | ||
2004 | inline void | |
2005 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2006 | size_t relnum, | |
2007 | Output_segment* tls_segment, | |
2008 | const elfcpp::Rel<32, false>& rel, | |
2009 | unsigned int, | |
2010 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2011 | unsigned char* view, | |
fe8718a4 | 2012 | section_size_type view_size) |
07f397ab ILT |
2013 | { |
2014 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2015 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2016 | ||
2017 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2018 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2019 | ||
2020 | unsigned char op1 = view[-1]; | |
2021 | unsigned char op2 = view[-2]; | |
2022 | ||
2023 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2024 | op2 == 0x8d || op2 == 0x04); | |
2025 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2026 | ||
2027 | int roff = 5; | |
2028 | ||
2029 | // FIXME: For now, support only one form. | |
2030 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2031 | op1 == 0x8d && op2 == 0x04); | |
2032 | ||
2033 | if (op2 == 0x04) | |
2034 | { | |
2035 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2036 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2037 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2038 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2039 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2040 | } | |
2041 | else | |
2042 | { | |
2043 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2044 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2045 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2046 | && view[9] == 0x90) |
2047 | { | |
2048 | // FIXME: This is not the right instruction sequence. | |
2049 | // There is a trailing nop. Use the size byte subl. | |
2050 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2051 | roff = 6; | |
2052 | } | |
2053 | else | |
2054 | { | |
2055 | // FIXME: This is not the right instruction sequence. | |
2056 | // Use the five byte subl. | |
2057 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2058 | } | |
2059 | } | |
2060 | ||
7bf1f802 | 2061 | value = tls_segment->memsz() - value; |
07f397ab ILT |
2062 | Relocate_functions<32, false>::rel32(view + roff, value); |
2063 | ||
2064 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2065 | // We can skip it. | |
2066 | this->skip_call_tls_get_addr_ = true; | |
2067 | } | |
2068 | ||
46cf9fa2 ILT |
2069 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2070 | // Local-Exec. | |
2071 | ||
2072 | inline void | |
2073 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2074 | size_t relnum, | |
2075 | Output_segment*, | |
2076 | const elfcpp::Rel<32, false>& rel, | |
2077 | unsigned int, | |
2078 | elfcpp::Elf_types<32>::Elf_Addr, | |
2079 | unsigned char* view, | |
fe8718a4 | 2080 | section_size_type view_size) |
46cf9fa2 ILT |
2081 | { |
2082 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2083 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2084 | ||
af6359d5 ILT |
2085 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2086 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2087 | |
2088 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2089 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2090 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2091 | |
af6359d5 | 2092 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2093 | |
2094 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2095 | ||
2096 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2097 | // We can skip it. | |
2098 | this->skip_call_tls_get_addr_ = true; | |
2099 | } | |
2100 | ||
56622147 ILT |
2101 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2102 | // Local-Exec. | |
2103 | ||
2104 | inline void | |
2105 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2106 | size_t relnum, | |
2107 | Output_segment* tls_segment, | |
2108 | const elfcpp::Rel<32, false>& rel, | |
2109 | unsigned int r_type, | |
2110 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2111 | unsigned char* view, | |
fe8718a4 | 2112 | section_size_type view_size) |
56622147 ILT |
2113 | { |
2114 | // We have to actually change the instructions, which means that we | |
2115 | // need to examine the opcodes to figure out which instruction we | |
2116 | // are looking at. | |
2117 | if (r_type == elfcpp::R_386_TLS_IE) | |
2118 | { | |
2119 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2120 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2121 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2122 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2123 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2124 | ||
2125 | unsigned char op1 = view[-1]; | |
2126 | if (op1 == 0xa1) | |
2127 | { | |
2128 | // movl XX,%eax ==> movl $YY,%eax | |
2129 | view[-1] = 0xb8; | |
2130 | } | |
2131 | else | |
2132 | { | |
2133 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2134 | ||
2135 | unsigned char op2 = view[-2]; | |
2136 | if (op2 == 0x8b) | |
2137 | { | |
2138 | // movl XX,%reg ==> movl $YY,%reg | |
2139 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2140 | (op1 & 0xc7) == 0x05); | |
2141 | view[-2] = 0xc7; | |
2142 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2143 | } | |
2144 | else if (op2 == 0x03) | |
2145 | { | |
2146 | // addl XX,%reg ==> addl $YY,%reg | |
2147 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2148 | (op1 & 0xc7) == 0x05); | |
2149 | view[-2] = 0x81; | |
2150 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2151 | } | |
2152 | else | |
2153 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2154 | } | |
2155 | } | |
2156 | else | |
2157 | { | |
2158 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2159 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2160 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2161 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2162 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2163 | ||
2164 | unsigned char op1 = view[-1]; | |
2165 | unsigned char op2 = view[-2]; | |
2166 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2167 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2168 | if (op2 == 0x8b) | |
2169 | { | |
2170 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2171 | view[-2] = 0xc7; | |
2172 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2173 | } | |
2174 | else if (op2 == 0x2b) | |
2175 | { | |
2176 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2177 | view[-2] = 0x81; | |
2178 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2179 | } | |
2180 | else if (op2 == 0x03) | |
2181 | { | |
2182 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2183 | view[-2] = 0x81; | |
2184 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2185 | } | |
2186 | else | |
2187 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2188 | } | |
2189 | ||
7bf1f802 | 2190 | value = tls_segment->memsz() - value; |
56622147 ILT |
2191 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2192 | value = - value; | |
2193 | ||
2194 | Relocate_functions<32, false>::rel32(view, value); | |
2195 | } | |
2196 | ||
61ba1cf9 ILT |
2197 | // Relocate section data. |
2198 | ||
2199 | void | |
92e059d8 | 2200 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2201 | unsigned int sh_type, |
2202 | const unsigned char* prelocs, | |
2203 | size_t reloc_count, | |
730cdc88 ILT |
2204 | Output_section* output_section, |
2205 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2206 | unsigned char* view, |
2207 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2208 | section_size_type view_size) |
61ba1cf9 | 2209 | { |
a3ad94ed | 2210 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2211 | |
ead1e424 ILT |
2212 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2213 | Target_i386::Relocate>( | |
92e059d8 | 2214 | relinfo, |
ead1e424 | 2215 | this, |
61ba1cf9 ILT |
2216 | prelocs, |
2217 | reloc_count, | |
730cdc88 ILT |
2218 | output_section, |
2219 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2220 | view, |
2221 | address, | |
2222 | view_size); | |
2223 | } | |
2224 | ||
6a74a719 ILT |
2225 | // Return the size of a relocation while scanning during a relocatable |
2226 | // link. | |
2227 | ||
2228 | unsigned int | |
2229 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2230 | unsigned int r_type, | |
2231 | Relobj* object) | |
2232 | { | |
2233 | switch (r_type) | |
2234 | { | |
2235 | case elfcpp::R_386_NONE: | |
2236 | case elfcpp::R_386_GNU_VTINHERIT: | |
2237 | case elfcpp::R_386_GNU_VTENTRY: | |
2238 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2239 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2240 | case elfcpp::R_386_TLS_DESC_CALL: | |
2241 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2242 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2243 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2244 | case elfcpp::R_386_TLS_IE_32: | |
2245 | case elfcpp::R_386_TLS_GOTIE: | |
2246 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2247 | case elfcpp::R_386_TLS_LE_32: | |
2248 | return 0; | |
2249 | ||
2250 | case elfcpp::R_386_32: | |
2251 | case elfcpp::R_386_PC32: | |
2252 | case elfcpp::R_386_GOT32: | |
2253 | case elfcpp::R_386_PLT32: | |
2254 | case elfcpp::R_386_GOTOFF: | |
2255 | case elfcpp::R_386_GOTPC: | |
2256 | return 4; | |
2257 | ||
2258 | case elfcpp::R_386_16: | |
2259 | case elfcpp::R_386_PC16: | |
2260 | return 2; | |
2261 | ||
2262 | case elfcpp::R_386_8: | |
2263 | case elfcpp::R_386_PC8: | |
2264 | return 1; | |
2265 | ||
2266 | // These are relocations which should only be seen by the | |
2267 | // dynamic linker, and should never be seen here. | |
2268 | case elfcpp::R_386_COPY: | |
2269 | case elfcpp::R_386_GLOB_DAT: | |
2270 | case elfcpp::R_386_JUMP_SLOT: | |
2271 | case elfcpp::R_386_RELATIVE: | |
2272 | case elfcpp::R_386_TLS_TPOFF: | |
2273 | case elfcpp::R_386_TLS_DTPMOD32: | |
2274 | case elfcpp::R_386_TLS_DTPOFF32: | |
2275 | case elfcpp::R_386_TLS_TPOFF32: | |
2276 | case elfcpp::R_386_TLS_DESC: | |
2277 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2278 | return 0; | |
2279 | ||
2280 | case elfcpp::R_386_32PLT: | |
2281 | case elfcpp::R_386_TLS_GD_32: | |
2282 | case elfcpp::R_386_TLS_GD_PUSH: | |
2283 | case elfcpp::R_386_TLS_GD_CALL: | |
2284 | case elfcpp::R_386_TLS_GD_POP: | |
2285 | case elfcpp::R_386_TLS_LDM_32: | |
2286 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2287 | case elfcpp::R_386_TLS_LDM_CALL: | |
2288 | case elfcpp::R_386_TLS_LDM_POP: | |
2289 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2290 | default: | |
2291 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2292 | return 0; | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | // Scan the relocs during a relocatable link. | |
2297 | ||
2298 | void | |
2299 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2300 | Symbol_table* symtab, | |
2301 | Layout* layout, | |
2302 | Sized_relobj<32, false>* object, | |
2303 | unsigned int data_shndx, | |
2304 | unsigned int sh_type, | |
2305 | const unsigned char* prelocs, | |
2306 | size_t reloc_count, | |
2307 | Output_section* output_section, | |
2308 | bool needs_special_offset_handling, | |
2309 | size_t local_symbol_count, | |
2310 | const unsigned char* plocal_symbols, | |
2311 | Relocatable_relocs* rr) | |
2312 | { | |
2313 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2314 | ||
2315 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2316 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2317 | ||
7019cd25 | 2318 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2319 | Scan_relocatable_relocs>( |
2320 | options, | |
2321 | symtab, | |
2322 | layout, | |
2323 | object, | |
2324 | data_shndx, | |
2325 | prelocs, | |
2326 | reloc_count, | |
2327 | output_section, | |
2328 | needs_special_offset_handling, | |
2329 | local_symbol_count, | |
2330 | plocal_symbols, | |
2331 | rr); | |
2332 | } | |
2333 | ||
2334 | // Relocate a section during a relocatable link. | |
2335 | ||
2336 | void | |
2337 | Target_i386::relocate_for_relocatable( | |
2338 | const Relocate_info<32, false>* relinfo, | |
2339 | unsigned int sh_type, | |
2340 | const unsigned char* prelocs, | |
2341 | size_t reloc_count, | |
2342 | Output_section* output_section, | |
2343 | off_t offset_in_output_section, | |
2344 | const Relocatable_relocs* rr, | |
2345 | unsigned char* view, | |
2346 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2347 | section_size_type view_size, | |
2348 | unsigned char* reloc_view, | |
2349 | section_size_type reloc_view_size) | |
2350 | { | |
2351 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2352 | ||
7019cd25 | 2353 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2354 | relinfo, |
2355 | prelocs, | |
2356 | reloc_count, | |
2357 | output_section, | |
2358 | offset_in_output_section, | |
2359 | rr, | |
2360 | view, | |
2361 | view_address, | |
2362 | view_size, | |
2363 | reloc_view, | |
2364 | reloc_view_size); | |
2365 | } | |
2366 | ||
ab5c9e90 ILT |
2367 | // Return the value to use for a dynamic which requires special |
2368 | // treatment. This is how we support equality comparisons of function | |
2369 | // pointers across shared library boundaries, as described in the | |
2370 | // processor specific ABI supplement. | |
2371 | ||
2372 | uint64_t | |
2373 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2374 | { | |
2375 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2376 | return this->plt_section()->address() + gsym->plt_offset(); | |
2377 | } | |
2378 | ||
c51e6221 ILT |
2379 | // Return a string used to fill a code section with nops to take up |
2380 | // the specified length. | |
2381 | ||
2382 | std::string | |
8851ecca | 2383 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2384 | { |
2385 | if (length >= 16) | |
2386 | { | |
2387 | // Build a jmp instruction to skip over the bytes. | |
2388 | unsigned char jmp[5]; | |
2389 | jmp[0] = 0xe9; | |
2390 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2391 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2392 | + std::string(length - 5, '\0')); | |
2393 | } | |
2394 | ||
2395 | // Nop sequences of various lengths. | |
2396 | const char nop1[1] = { 0x90 }; // nop | |
2397 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2398 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2399 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2400 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2401 | 0x00 }; // leal 0(%esi,1),%esi | |
2402 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2403 | 0x00, 0x00 }; | |
2404 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2405 | 0x00, 0x00, 0x00 }; | |
2406 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2407 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2408 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2409 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2410 | 0x00 }; | |
2411 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2412 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2413 | 0x00, 0x00 }; | |
2414 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2415 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2416 | 0x00, 0x00, 0x00 }; | |
2417 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2418 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2419 | 0x00, 0x00, 0x00, 0x00 }; | |
2420 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2421 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2422 | 0x27, 0x00, 0x00, 0x00, | |
2423 | 0x00 }; | |
2424 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2425 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2426 | 0xbc, 0x27, 0x00, 0x00, | |
2427 | 0x00, 0x00 }; | |
2428 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2429 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2430 | 0x90, 0x90, 0x90, 0x90, | |
2431 | 0x90, 0x90, 0x90 }; | |
2432 | ||
2433 | const char* nops[16] = { | |
2434 | NULL, | |
2435 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2436 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2437 | }; | |
2438 | ||
2439 | return std::string(nops[length], length); | |
2440 | } | |
2441 | ||
14bfc3f5 ILT |
2442 | // The selector for i386 object files. |
2443 | ||
2444 | class Target_selector_i386 : public Target_selector | |
2445 | { | |
2446 | public: | |
2447 | Target_selector_i386() | |
e96caa79 | 2448 | : Target_selector(elfcpp::EM_386, 32, false, "elf32-i386") |
14bfc3f5 ILT |
2449 | { } |
2450 | ||
2451 | Target* | |
e96caa79 ILT |
2452 | do_instantiate_target() |
2453 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2454 | }; |
2455 | ||
14bfc3f5 ILT |
2456 | Target_selector_i386 target_selector_i386; |
2457 | ||
2458 | } // End anonymous namespace. |