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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 | |
c2b45e22 CC |
239 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
240 | // transition. | |
241 | inline void | |
242 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
243 | Output_segment* tls_segment, | |
244 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
245 | elfcpp::Elf_types<32>::Elf_Addr value, | |
246 | unsigned char* view, | |
247 | section_size_type view_size); | |
248 | ||
249 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
250 | // transition. | |
251 | inline void | |
252 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
253 | Output_segment* tls_segment, | |
254 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
255 | elfcpp::Elf_types<32>::Elf_Addr value, | |
256 | unsigned char* view, | |
257 | section_size_type view_size); | |
258 | ||
56622147 | 259 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 260 | inline void |
56622147 | 261 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
262 | Output_segment* tls_segment, |
263 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
264 | elfcpp::Elf_types<32>::Elf_Addr value, | |
265 | unsigned char* view, | |
fe8718a4 | 266 | section_size_type view_size); |
ead1e424 | 267 | |
56622147 ILT |
268 | // Do a TLS Initial-Exec to Local-Exec transition. |
269 | static inline void | |
270 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
271 | Output_segment* tls_segment, |
272 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
273 | elfcpp::Elf_types<32>::Elf_Addr value, | |
274 | unsigned char* view, | |
fe8718a4 | 275 | section_size_type view_size); |
46cf9fa2 | 276 | |
46cf9fa2 ILT |
277 | // We need to keep track of which type of local dynamic relocation |
278 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
279 | enum Local_dynamic_type | |
280 | { | |
281 | LOCAL_DYNAMIC_NONE, | |
282 | LOCAL_DYNAMIC_SUN, | |
283 | LOCAL_DYNAMIC_GNU | |
284 | }; | |
285 | ||
ead1e424 ILT |
286 | // This is set if we should skip the next reloc, which should be a |
287 | // PLT32 reloc against ___tls_get_addr. | |
288 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
289 | // The type of local dynamic relocation we have seen in the section |
290 | // being relocated, if any. | |
291 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
292 | }; |
293 | ||
6a74a719 ILT |
294 | // A class which returns the size required for a relocation type, |
295 | // used while scanning relocs during a relocatable link. | |
296 | class Relocatable_size_for_reloc | |
297 | { | |
298 | public: | |
299 | unsigned int | |
300 | get_size_for_reloc(unsigned int, Relobj*); | |
301 | }; | |
302 | ||
92e059d8 ILT |
303 | // Adjust TLS relocation type based on the options and whether this |
304 | // is a local symbol. | |
af6359d5 | 305 | static tls::Tls_optimization |
7e1edb90 | 306 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 307 | |
ead1e424 | 308 | // Get the GOT section, creating it if necessary. |
dbe717ef | 309 | Output_data_got<32, false>* |
7e1edb90 | 310 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 311 | |
96f2030e ILT |
312 | // Get the GOT PLT section. |
313 | Output_data_space* | |
314 | got_plt_section() const | |
315 | { | |
316 | gold_assert(this->got_plt_ != NULL); | |
317 | return this->got_plt_; | |
318 | } | |
319 | ||
a3ad94ed ILT |
320 | // Create a PLT entry for a global symbol. |
321 | void | |
7e1edb90 | 322 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 323 | |
94c4710f ILT |
324 | // Create a GOT entry for the TLS module index. |
325 | unsigned int | |
326 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
327 | Sized_relobj<32, false>* object); | |
328 | ||
a3ad94ed | 329 | // Get the PLT section. |
7bb3655e | 330 | const Output_data_plt_i386* |
a3ad94ed ILT |
331 | plt_section() const |
332 | { | |
333 | gold_assert(this->plt_ != NULL); | |
334 | return this->plt_; | |
335 | } | |
336 | ||
5a6f7e2d ILT |
337 | // Get the dynamic reloc section, creating it if necessary. |
338 | Reloc_section* | |
339 | rel_dyn_section(Layout*); | |
340 | ||
d61c6bd4 ILT |
341 | // Return true if the symbol may need a COPY relocation. |
342 | // References from an executable object to non-function symbols | |
343 | // defined in a dynamic object may need a COPY relocation. | |
344 | bool | |
345 | may_need_copy_reloc(Symbol* gsym) | |
346 | { | |
8851ecca | 347 | return (!parameters->options().shared() |
d61c6bd4 ILT |
348 | && gsym->is_from_dynobj() |
349 | && gsym->type() != elfcpp::STT_FUNC); | |
350 | } | |
351 | ||
a3ad94ed ILT |
352 | // Copy a relocation against a global symbol. |
353 | void | |
5a6f7e2d ILT |
354 | copy_reloc(const General_options*, Symbol_table*, Layout*, |
355 | Sized_relobj<32, false>*, unsigned int, | |
4f4c5f80 | 356 | Output_section*, Symbol*, const elfcpp::Rel<32, false>&); |
ead1e424 | 357 | |
92e059d8 ILT |
358 | // Information about this specific target which we pass to the |
359 | // general Target structure. | |
75f65a3e | 360 | static const Target::Target_info i386_info; |
ead1e424 | 361 | |
0a65a3a7 CC |
362 | // The types of GOT entries needed for this platform. |
363 | enum Got_type | |
364 | { | |
365 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
366 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
367 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
368 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
369 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
370 | }; |
371 | ||
ead1e424 | 372 | // The GOT section. |
dbe717ef | 373 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
374 | // The PLT section. |
375 | Output_data_plt_i386* plt_; | |
376 | // The GOT PLT section. | |
377 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
378 | // The dynamic reloc section. |
379 | Reloc_section* rel_dyn_; | |
380 | // Relocs saved to avoid a COPY reloc. | |
381 | Copy_relocs<32, false>* copy_relocs_; | |
382 | // Space for variables copied with a COPY reloc. | |
383 | Output_data_space* dynbss_; | |
c2b45e22 | 384 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 385 | unsigned int got_mod_index_offset_; |
75f65a3e ILT |
386 | }; |
387 | ||
388 | const Target::Target_info Target_i386::i386_info = | |
389 | { | |
61ba1cf9 ILT |
390 | 32, // size |
391 | false, // is_big_endian | |
392 | elfcpp::EM_386, // machine_code | |
393 | false, // has_make_symbol | |
dbe717ef | 394 | false, // has_resolve |
c51e6221 | 395 | true, // has_code_fill |
35cdfc9a | 396 | true, // is_default_stack_executable |
0864d551 | 397 | '\0', // wrap_char |
dbe717ef | 398 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 399 | 0x08048000, // default_text_segment_address |
cd72c291 ILT |
400 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
401 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
14bfc3f5 ILT |
402 | }; |
403 | ||
ead1e424 ILT |
404 | // Get the GOT section, creating it if necessary. |
405 | ||
dbe717ef | 406 | Output_data_got<32, false>* |
7e1edb90 | 407 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
408 | { |
409 | if (this->got_ == NULL) | |
410 | { | |
7e1edb90 | 411 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 412 | |
7e1edb90 | 413 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 414 | |
ead1e424 | 415 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
416 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
417 | this->got_); | |
ead1e424 | 418 | |
a3ad94ed ILT |
419 | // The old GNU linker creates a .got.plt section. We just |
420 | // create another set of data in the .got section. Note that we | |
421 | // always create a PLT if we create a GOT, although the PLT | |
422 | // might be empty. | |
423 | this->got_plt_ = new Output_data_space(4); | |
424 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
425 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
426 | this->got_plt_); | |
a3ad94ed | 427 | |
ead1e424 | 428 | // The first three entries are reserved. |
27bc2bce | 429 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 430 | |
a3ad94ed | 431 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 432 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 433 | this->got_plt_, |
ead1e424 | 434 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 435 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
436 | elfcpp::STV_HIDDEN, 0, |
437 | false, false); | |
438 | } | |
a3ad94ed | 439 | |
ead1e424 ILT |
440 | return this->got_; |
441 | } | |
442 | ||
5a6f7e2d ILT |
443 | // Get the dynamic reloc section, creating it if necessary. |
444 | ||
445 | Target_i386::Reloc_section* | |
446 | Target_i386::rel_dyn_section(Layout* layout) | |
447 | { | |
448 | if (this->rel_dyn_ == NULL) | |
449 | { | |
450 | gold_assert(layout != NULL); | |
451 | this->rel_dyn_ = new Reloc_section(); | |
452 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
453 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
454 | } | |
455 | return this->rel_dyn_; | |
456 | } | |
457 | ||
a3ad94ed ILT |
458 | // A class to handle the PLT data. |
459 | ||
460 | class Output_data_plt_i386 : public Output_section_data | |
461 | { | |
462 | public: | |
463 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
464 | ||
7e1edb90 | 465 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
466 | |
467 | // Add an entry to the PLT. | |
468 | void | |
469 | add_entry(Symbol* gsym); | |
470 | ||
16649710 ILT |
471 | // Return the .rel.plt section data. |
472 | const Reloc_section* | |
473 | rel_plt() const | |
474 | { return this->rel_; } | |
475 | ||
476 | protected: | |
477 | void | |
478 | do_adjust_output_section(Output_section* os); | |
479 | ||
a3ad94ed ILT |
480 | private: |
481 | // The size of an entry in the PLT. | |
482 | static const int plt_entry_size = 16; | |
483 | ||
484 | // The first entry in the PLT for an executable. | |
485 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
486 | ||
487 | // The first entry in the PLT for a shared object. | |
488 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
489 | ||
490 | // Other entries in the PLT for an executable. | |
491 | static unsigned char exec_plt_entry[plt_entry_size]; | |
492 | ||
493 | // Other entries in the PLT for a shared object. | |
494 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
495 | ||
496 | // Set the final size. | |
497 | void | |
27bc2bce | 498 | set_final_data_size() |
a3ad94ed ILT |
499 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
500 | ||
501 | // Write out the PLT data. | |
502 | void | |
503 | do_write(Output_file*); | |
504 | ||
505 | // The reloc section. | |
506 | Reloc_section* rel_; | |
507 | // The .got.plt section. | |
508 | Output_data_space* got_plt_; | |
509 | // The number of PLT entries. | |
510 | unsigned int count_; | |
a3ad94ed ILT |
511 | }; |
512 | ||
513 | // Create the PLT section. The ordinary .got section is an argument, | |
514 | // since we need to refer to the start. We also create our own .got | |
515 | // section just for PLT entries. | |
516 | ||
517 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 518 | Output_data_space* got_plt) |
80576242 | 519 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
520 | { |
521 | this->rel_ = new Reloc_section(); | |
522 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
523 | elfcpp::SHF_ALLOC, this->rel_); | |
524 | } | |
525 | ||
16649710 ILT |
526 | void |
527 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
528 | { | |
529 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
530 | // linker, and so do we. | |
531 | os->set_entsize(4); | |
532 | } | |
533 | ||
a3ad94ed ILT |
534 | // Add an entry to the PLT. |
535 | ||
536 | void | |
537 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
538 | { | |
539 | gold_assert(!gsym->has_plt_offset()); | |
540 | ||
541 | // Note that when setting the PLT offset we skip the initial | |
542 | // reserved PLT entry. | |
543 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
544 | ||
545 | ++this->count_; | |
546 | ||
fe8718a4 | 547 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
548 | |
549 | // Every PLT entry needs a GOT entry which points back to the PLT | |
550 | // entry (this will be changed by the dynamic linker, normally | |
551 | // lazily when the function is called). | |
27bc2bce | 552 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
553 | |
554 | // Every PLT entry needs a reloc. | |
16649710 | 555 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
556 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
557 | got_offset); | |
558 | ||
559 | // Note that we don't need to save the symbol. The contents of the | |
560 | // PLT are independent of which symbols are used. The symbols only | |
561 | // appear in the relocations. | |
562 | } | |
563 | ||
564 | // The first entry in the PLT for an executable. | |
565 | ||
566 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
567 | { | |
568 | 0xff, 0x35, // pushl contents of memory address | |
569 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
570 | 0xff, 0x25, // jmp indirect | |
571 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
572 | 0, 0, 0, 0 // unused | |
573 | }; | |
574 | ||
575 | // The first entry in the PLT for a shared object. | |
576 | ||
577 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
578 | { | |
579 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
580 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
581 | 0, 0, 0, 0 // unused | |
582 | }; | |
583 | ||
584 | // Subsequent entries in the PLT for an executable. | |
585 | ||
586 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
587 | { | |
588 | 0xff, 0x25, // jmp indirect | |
589 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
590 | 0x68, // pushl immediate | |
591 | 0, 0, 0, 0, // replaced with offset into relocation table | |
592 | 0xe9, // jmp relative | |
593 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
594 | }; | |
595 | ||
596 | // Subsequent entries in the PLT for a shared object. | |
597 | ||
598 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
599 | { | |
600 | 0xff, 0xa3, // jmp *offset(%ebx) | |
601 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
602 | 0x68, // pushl immediate | |
603 | 0, 0, 0, 0, // replaced with offset into relocation table | |
604 | 0xe9, // jmp relative | |
605 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
606 | }; | |
607 | ||
608 | // Write out the PLT. This uses the hand-coded instructions above, | |
609 | // and adjusts them as needed. This is all specified by the i386 ELF | |
610 | // Processor Supplement. | |
611 | ||
612 | void | |
613 | Output_data_plt_i386::do_write(Output_file* of) | |
614 | { | |
615 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
616 | const section_size_type oview_size = |
617 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
618 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
619 | ||
620 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
621 | const section_size_type got_size = |
622 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
623 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
624 | got_size); | |
625 | ||
626 | unsigned char* pov = oview; | |
627 | ||
628 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
629 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
630 | ||
8851ecca | 631 | if (parameters->options().shared()) |
a3ad94ed ILT |
632 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
633 | else | |
634 | { | |
635 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
636 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
637 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
638 | } | |
639 | pov += plt_entry_size; | |
640 | ||
641 | unsigned char* got_pov = got_view; | |
642 | ||
643 | memset(got_pov, 0, 12); | |
644 | got_pov += 12; | |
645 | ||
646 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
647 | ||
648 | unsigned int plt_offset = plt_entry_size; | |
649 | unsigned int plt_rel_offset = 0; | |
650 | unsigned int got_offset = 12; | |
651 | const unsigned int count = this->count_; | |
652 | for (unsigned int i = 0; | |
653 | i < count; | |
654 | ++i, | |
655 | pov += plt_entry_size, | |
656 | got_pov += 4, | |
657 | plt_offset += plt_entry_size, | |
658 | plt_rel_offset += rel_size, | |
659 | got_offset += 4) | |
660 | { | |
661 | // Set and adjust the PLT entry itself. | |
662 | ||
8851ecca | 663 | if (parameters->options().shared()) |
a3ad94ed ILT |
664 | { |
665 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
666 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
667 | } | |
668 | else | |
669 | { | |
670 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
671 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
672 | (got_address | |
673 | + got_offset)); | |
674 | } | |
675 | ||
676 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
677 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
678 | - (plt_offset + plt_entry_size)); | |
679 | ||
680 | // Set the entry in the GOT. | |
681 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
682 | } | |
683 | ||
fe8718a4 ILT |
684 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
685 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
686 | |
687 | of->write_output_view(offset, oview_size, oview); | |
688 | of->write_output_view(got_file_offset, got_size, got_view); | |
689 | } | |
690 | ||
691 | // Create a PLT entry for a global symbol. | |
692 | ||
693 | void | |
7e1edb90 | 694 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
695 | { |
696 | if (gsym->has_plt_offset()) | |
697 | return; | |
698 | ||
699 | if (this->plt_ == NULL) | |
700 | { | |
701 | // Create the GOT sections first. | |
7e1edb90 | 702 | this->got_section(symtab, layout); |
a3ad94ed | 703 | |
7e1edb90 | 704 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
705 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
706 | (elfcpp::SHF_ALLOC | |
707 | | elfcpp::SHF_EXECINSTR), | |
708 | this->plt_); | |
a3ad94ed ILT |
709 | } |
710 | ||
711 | this->plt_->add_entry(gsym); | |
712 | } | |
713 | ||
94c4710f ILT |
714 | // Create a GOT entry for the TLS module index. |
715 | ||
716 | unsigned int | |
717 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
718 | Sized_relobj<32, false>* object) | |
719 | { | |
720 | if (this->got_mod_index_offset_ == -1U) | |
721 | { | |
722 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
723 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
724 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
725 | unsigned int got_offset = got->add_constant(0); | |
726 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
727 | got_offset); | |
94c4710f ILT |
728 | this->got_mod_index_offset_ = got_offset; |
729 | } | |
730 | return this->got_mod_index_offset_; | |
731 | } | |
732 | ||
a3ad94ed ILT |
733 | // Handle a relocation against a non-function symbol defined in a |
734 | // dynamic object. The traditional way to handle this is to generate | |
735 | // a COPY relocation to copy the variable at runtime from the shared | |
736 | // object into the executable's data segment. However, this is | |
737 | // undesirable in general, as if the size of the object changes in the | |
738 | // dynamic object, the executable will no longer work correctly. If | |
739 | // this relocation is in a writable section, then we can create a | |
740 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
741 | // address at runtime. However, we do not want do that if the | |
742 | // relocation is in a read-only section, as it would prevent the | |
743 | // readonly segment from being shared. And if we have to eventually | |
744 | // generate a COPY reloc, then any dynamic relocations will be | |
745 | // useless. So this means that if this is a writable section, we need | |
746 | // to save the relocation until we see whether we have to create a | |
747 | // COPY relocation for this symbol for any other relocation. | |
748 | ||
749 | void | |
750 | Target_i386::copy_reloc(const General_options* options, | |
5a6f7e2d ILT |
751 | Symbol_table* symtab, |
752 | Layout* layout, | |
a3ad94ed | 753 | Sized_relobj<32, false>* object, |
4f4c5f80 ILT |
754 | unsigned int data_shndx, |
755 | Output_section* output_section, | |
756 | Symbol* gsym, | |
5a6f7e2d | 757 | const elfcpp::Rel<32, false>& rel) |
a3ad94ed | 758 | { |
7d1a9ebb | 759 | Sized_symbol<32>* ssym = symtab->get_sized_symbol<32>(gsym); |
5a6f7e2d ILT |
760 | |
761 | if (!Copy_relocs<32, false>::need_copy_reloc(options, object, | |
762 | data_shndx, ssym)) | |
a3ad94ed ILT |
763 | { |
764 | // So far we do not need a COPY reloc. Save this relocation. | |
5a6f7e2d ILT |
765 | // If it turns out that we never need a COPY reloc for this |
766 | // symbol, then we will emit the relocation. | |
767 | if (this->copy_relocs_ == NULL) | |
768 | this->copy_relocs_ = new Copy_relocs<32, false>(); | |
4f4c5f80 | 769 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rel); |
a3ad94ed | 770 | } |
5a6f7e2d ILT |
771 | else |
772 | { | |
773 | // Allocate space for this symbol in the .bss section. | |
774 | ||
775 | elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize(); | |
776 | ||
777 | // There is no defined way to determine the required alignment | |
778 | // of the symbol. We pick the alignment based on the size. We | |
779 | // set an arbitrary maximum of 256. | |
780 | unsigned int align; | |
781 | for (align = 1; align < 512; align <<= 1) | |
782 | if ((symsize & align) != 0) | |
783 | break; | |
a3ad94ed | 784 | |
5a6f7e2d ILT |
785 | if (this->dynbss_ == NULL) |
786 | { | |
787 | this->dynbss_ = new Output_data_space(align); | |
788 | layout->add_output_section_data(".bss", | |
789 | elfcpp::SHT_NOBITS, | |
790 | (elfcpp::SHF_ALLOC | |
791 | | elfcpp::SHF_WRITE), | |
792 | this->dynbss_); | |
793 | } | |
794 | ||
795 | Output_data_space* dynbss = this->dynbss_; | |
796 | ||
797 | if (align > dynbss->addralign()) | |
798 | dynbss->set_space_alignment(align); | |
799 | ||
fe8718a4 ILT |
800 | section_size_type dynbss_size = |
801 | convert_to_section_size_type(dynbss->current_data_size()); | |
5a6f7e2d | 802 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 803 | section_size_type offset = dynbss_size; |
27bc2bce | 804 | dynbss->set_current_data_size(dynbss_size + symsize); |
5a6f7e2d | 805 | |
9b07f471 | 806 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
5a6f7e2d ILT |
807 | |
808 | // Add the COPY reloc. | |
809 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
810 | rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset); | |
811 | } | |
a3ad94ed ILT |
812 | } |
813 | ||
92e059d8 | 814 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
815 | // symbol. IS_FINAL is true if the final address of this symbol is |
816 | // known at link time. | |
92e059d8 | 817 | |
af6359d5 | 818 | tls::Tls_optimization |
7e1edb90 | 819 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
820 | { |
821 | // If we are generating a shared library, then we can't do anything | |
822 | // in the linker. | |
8851ecca | 823 | if (parameters->options().shared()) |
af6359d5 | 824 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
825 | |
826 | switch (r_type) | |
827 | { | |
828 | case elfcpp::R_386_TLS_GD: | |
829 | case elfcpp::R_386_TLS_GOTDESC: | |
830 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 831 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
832 | // access. Since we know that we are generating an executable, |
833 | // we can convert this to Initial-Exec. If we also know that | |
834 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 835 | if (is_final) |
af6359d5 ILT |
836 | return tls::TLSOPT_TO_LE; |
837 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
838 | |
839 | case elfcpp::R_386_TLS_LDM: | |
840 | // This is Local-Dynamic, which refers to a local symbol in the | |
841 | // dynamic TLS block. Since we know that we generating an | |
842 | // executable, we can switch to Local-Exec. | |
af6359d5 | 843 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
844 | |
845 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
846 | // Another type of Local-Dynamic relocation. |
847 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
848 | |
849 | case elfcpp::R_386_TLS_IE: | |
850 | case elfcpp::R_386_TLS_GOTIE: | |
851 | case elfcpp::R_386_TLS_IE_32: | |
852 | // These are Initial-Exec relocs which get the thread offset | |
853 | // from the GOT. If we know that we are linking against the | |
854 | // local symbol, we can switch to Local-Exec, which links the | |
855 | // thread offset into the instruction. | |
a3ad94ed | 856 | if (is_final) |
af6359d5 ILT |
857 | return tls::TLSOPT_TO_LE; |
858 | return tls::TLSOPT_NONE; | |
8462ae85 | 859 | |
92e059d8 ILT |
860 | case elfcpp::R_386_TLS_LE: |
861 | case elfcpp::R_386_TLS_LE_32: | |
862 | // When we already have Local-Exec, there is nothing further we | |
863 | // can do. | |
af6359d5 | 864 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
865 | |
866 | default: | |
a3ad94ed | 867 | gold_unreachable(); |
92e059d8 ILT |
868 | } |
869 | } | |
870 | ||
af6359d5 ILT |
871 | // Report an unsupported relocation against a local symbol. |
872 | ||
873 | void | |
874 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
875 | unsigned int r_type) | |
876 | { | |
75f2446e ILT |
877 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
878 | object->name().c_str(), r_type); | |
af6359d5 ILT |
879 | } |
880 | ||
92e059d8 ILT |
881 | // Scan a relocation for a local symbol. |
882 | ||
883 | inline void | |
7e1edb90 | 884 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
885 | Symbol_table* symtab, |
886 | Layout* layout, | |
887 | Target_i386* target, | |
f6ce93d6 | 888 | Sized_relobj<32, false>* object, |
1b64748b | 889 | unsigned int data_shndx, |
07f397ab | 890 | Output_section* output_section, |
1b64748b | 891 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 892 | unsigned int r_type, |
7bf1f802 | 893 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
894 | { |
895 | switch (r_type) | |
896 | { | |
897 | case elfcpp::R_386_NONE: | |
898 | case elfcpp::R_386_GNU_VTINHERIT: | |
899 | case elfcpp::R_386_GNU_VTENTRY: | |
900 | break; | |
901 | ||
902 | case elfcpp::R_386_32: | |
436ca963 ILT |
903 | // If building a shared library (or a position-independent |
904 | // executable), we need to create a dynamic relocation for | |
905 | // this location. The relocation applied at link time will | |
906 | // apply the link-time value, so we flag the location with | |
907 | // an R_386_RELATIVE relocation so the dynamic loader can | |
908 | // relocate it easily. | |
8851ecca | 909 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
910 | { |
911 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
912 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
913 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
914 | output_section, data_shndx, | |
915 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
916 | } |
917 | break; | |
918 | ||
919 | case elfcpp::R_386_16: | |
920 | case elfcpp::R_386_8: | |
921 | // If building a shared library (or a position-independent | |
922 | // executable), we need to create a dynamic relocation for | |
923 | // this location. Because the addend needs to remain in the | |
924 | // data section, we need to be careful not to apply this | |
925 | // relocation statically. | |
8851ecca | 926 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
927 | { |
928 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
dceae3c1 ILT |
929 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
930 | { | |
931 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
932 | rel_dyn->add_local(object, r_sym, r_type, output_section, | |
933 | data_shndx, reloc.get_r_offset()); | |
934 | } | |
935 | else | |
936 | { | |
937 | gold_assert(lsym.get_st_value() == 0); | |
938 | rel_dyn->add_local_section(object, lsym.get_st_shndx(), | |
939 | r_type, output_section, | |
940 | data_shndx, reloc.get_r_offset()); | |
941 | } | |
436ca963 | 942 | } |
92e059d8 ILT |
943 | break; |
944 | ||
945 | case elfcpp::R_386_PC32: | |
946 | case elfcpp::R_386_PC16: | |
947 | case elfcpp::R_386_PC8: | |
948 | break; | |
949 | ||
df2efe71 ILT |
950 | case elfcpp::R_386_PLT32: |
951 | // Since we know this is a local symbol, we can handle this as a | |
952 | // PC32 reloc. | |
953 | break; | |
954 | ||
ead1e424 ILT |
955 | case elfcpp::R_386_GOTOFF: |
956 | case elfcpp::R_386_GOTPC: | |
957 | // We need a GOT section. | |
7e1edb90 | 958 | target->got_section(symtab, layout); |
ead1e424 ILT |
959 | break; |
960 | ||
1b64748b ILT |
961 | case elfcpp::R_386_GOT32: |
962 | { | |
963 | // The symbol requires a GOT entry. | |
964 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
965 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 966 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
967 | { |
968 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 969 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 970 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
971 | { |
972 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 973 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
974 | rel_dyn->add_local_relative( |
975 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
976 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
977 | } |
978 | } | |
979 | } | |
980 | break; | |
981 | ||
af6359d5 ILT |
982 | // These are relocations which should only be seen by the |
983 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
984 | case elfcpp::R_386_COPY: |
985 | case elfcpp::R_386_GLOB_DAT: | |
986 | case elfcpp::R_386_JUMP_SLOT: | |
987 | case elfcpp::R_386_RELATIVE: | |
988 | case elfcpp::R_386_TLS_TPOFF: | |
989 | case elfcpp::R_386_TLS_DTPMOD32: | |
990 | case elfcpp::R_386_TLS_DTPOFF32: | |
991 | case elfcpp::R_386_TLS_TPOFF32: | |
992 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 993 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 994 | object->name().c_str(), r_type); |
92e059d8 ILT |
995 | break; |
996 | ||
af6359d5 | 997 | // These are initial TLS relocs, which are expected when |
d61c17ea | 998 | // linking. |
56622147 ILT |
999 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1000 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1001 | case elfcpp::R_386_TLS_DESC_CALL: | |
1002 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1003 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1004 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1005 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1006 | case elfcpp::R_386_TLS_GOTIE: |
1007 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1008 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1009 | { |
8851ecca | 1010 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1011 | const tls::Tls_optimization optimized_type |
1012 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1013 | switch (r_type) |
1014 | { | |
56622147 | 1015 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1016 | if (optimized_type == tls::TLSOPT_NONE) |
1017 | { | |
1018 | // Create a pair of GOT entries for the module index and | |
1019 | // dtv-relative offset. | |
1020 | Output_data_got<32, false>* got | |
1021 | = target->got_section(symtab, layout); | |
1022 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 CC |
1023 | got->add_local_pair_with_rel(object, r_sym, |
1024 | lsym.get_st_shndx(), | |
1025 | GOT_TYPE_TLS_PAIR, | |
1026 | target->rel_dyn_section(layout), | |
1027 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1028 | } |
1029 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1030 | unsupported_reloc_local(object, r_type); | |
1031 | break; | |
1032 | ||
56622147 | 1033 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
c2b45e22 CC |
1034 | if (optimized_type == tls::TLSOPT_NONE) |
1035 | { | |
1036 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1037 | Output_data_got<32, false>* got | |
1038 | = target->got_section(symtab, layout); | |
1039 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1040 | got->add_local_pair_with_rel(object, r_sym, | |
1041 | lsym.get_st_shndx(), | |
1042 | GOT_TYPE_TLS_DESC, | |
1043 | target->rel_dyn_section(layout), | |
1044 | elfcpp::R_386_TLS_DESC, 0); | |
1045 | } | |
1046 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1047 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1048 | break; |
1049 | ||
c2b45e22 CC |
1050 | case elfcpp::R_386_TLS_DESC_CALL: |
1051 | break; | |
1052 | ||
56622147 | 1053 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1054 | if (optimized_type == tls::TLSOPT_NONE) |
1055 | { | |
1056 | // Create a GOT entry for the module index. | |
94c4710f | 1057 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1058 | } |
1059 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1060 | unsupported_reloc_local(object, r_type); |
1061 | break; | |
1062 | ||
56622147 | 1063 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1064 | break; |
1065 | ||
56622147 ILT |
1066 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1067 | case elfcpp::R_386_TLS_IE_32: | |
1068 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1069 | layout->set_has_static_tls(); |
07f397ab ILT |
1070 | if (optimized_type == tls::TLSOPT_NONE) |
1071 | { | |
7bf1f802 ILT |
1072 | // For the R_386_TLS_IE relocation, we need to create a |
1073 | // dynamic relocation when building a shared library. | |
1074 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1075 | && parameters->options().shared()) |
7bf1f802 ILT |
1076 | { |
1077 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1078 | unsigned int r_sym |
1079 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1080 | rel_dyn->add_local_relative(object, r_sym, | |
1081 | elfcpp::R_386_RELATIVE, | |
1082 | output_section, data_shndx, | |
1083 | reloc.get_r_offset()); | |
7bf1f802 | 1084 | } |
07f397ab ILT |
1085 | // Create a GOT entry for the tp-relative offset. |
1086 | Output_data_got<32, false>* got | |
1087 | = target->got_section(symtab, layout); | |
1088 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1089 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1090 | ? elfcpp::R_386_TLS_TPOFF32 | |
1091 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1092 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1093 | ? GOT_TYPE_TLS_OFFSET | |
1094 | : GOT_TYPE_TLS_NOFFSET); | |
1095 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1096 | target->rel_dyn_section(layout), |
1097 | dyn_r_type); | |
07f397ab ILT |
1098 | } |
1099 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1100 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1101 | break; |
af6359d5 | 1102 | |
56622147 ILT |
1103 | case elfcpp::R_386_TLS_LE: // Local-exec |
1104 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1105 | layout->set_has_static_tls(); |
07f397ab | 1106 | if (output_is_shared) |
7bf1f802 ILT |
1107 | { |
1108 | // We need to create a dynamic relocation. | |
dceae3c1 | 1109 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1110 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1111 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1112 | ? elfcpp::R_386_TLS_TPOFF32 | |
1113 | : elfcpp::R_386_TLS_TPOFF); | |
1114 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1115 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1116 | data_shndx, reloc.get_r_offset()); | |
1117 | } | |
56622147 ILT |
1118 | break; |
1119 | ||
af6359d5 ILT |
1120 | default: |
1121 | gold_unreachable(); | |
7e1edb90 ILT |
1122 | } |
1123 | } | |
92e059d8 ILT |
1124 | break; |
1125 | ||
92e059d8 ILT |
1126 | case elfcpp::R_386_32PLT: |
1127 | case elfcpp::R_386_TLS_GD_32: | |
1128 | case elfcpp::R_386_TLS_GD_PUSH: | |
1129 | case elfcpp::R_386_TLS_GD_CALL: | |
1130 | case elfcpp::R_386_TLS_GD_POP: | |
1131 | case elfcpp::R_386_TLS_LDM_32: | |
1132 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1133 | case elfcpp::R_386_TLS_LDM_CALL: | |
1134 | case elfcpp::R_386_TLS_LDM_POP: | |
1135 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1136 | default: | |
af6359d5 | 1137 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1138 | break; |
1139 | } | |
1140 | } | |
1141 | ||
af6359d5 ILT |
1142 | // Report an unsupported relocation against a global symbol. |
1143 | ||
1144 | void | |
1145 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1146 | unsigned int r_type, | |
1147 | Symbol* gsym) | |
1148 | { | |
75f2446e | 1149 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1150 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1151 | } |
1152 | ||
92e059d8 ILT |
1153 | // Scan a relocation for a global symbol. |
1154 | ||
1155 | inline void | |
1156 | Target_i386::Scan::global(const General_options& options, | |
ead1e424 ILT |
1157 | Symbol_table* symtab, |
1158 | Layout* layout, | |
1159 | Target_i386* target, | |
f6ce93d6 | 1160 | Sized_relobj<32, false>* object, |
a3ad94ed | 1161 | unsigned int data_shndx, |
07f397ab | 1162 | Output_section* output_section, |
a3ad94ed ILT |
1163 | const elfcpp::Rel<32, false>& reloc, |
1164 | unsigned int r_type, | |
92e059d8 ILT |
1165 | Symbol* gsym) |
1166 | { | |
1167 | switch (r_type) | |
1168 | { | |
1169 | case elfcpp::R_386_NONE: | |
1170 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1171 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1172 | break; |
1173 | ||
1174 | case elfcpp::R_386_32: | |
92e059d8 | 1175 | case elfcpp::R_386_16: |
92e059d8 | 1176 | case elfcpp::R_386_8: |
96f2030e | 1177 | { |
d61c6bd4 ILT |
1178 | // Make a PLT entry if necessary. |
1179 | if (gsym->needs_plt_entry()) | |
1180 | { | |
1181 | target->make_plt_entry(symtab, layout, gsym); | |
1182 | // Since this is not a PC-relative relocation, we may be | |
1183 | // taking the address of a function. In that case we need to | |
1184 | // set the entry in the dynamic symbol table to the address of | |
1185 | // the PLT entry. | |
8851ecca | 1186 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1187 | gsym->set_needs_dynsym_value(); |
1188 | } | |
1189 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1190 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1191 | { |
1192 | if (target->may_need_copy_reloc(gsym)) | |
1193 | { | |
07f397ab | 1194 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1195 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1196 | } |
1197 | else if (r_type == elfcpp::R_386_32 | |
1198 | && gsym->can_use_relative_reloc(false)) | |
1199 | { | |
1200 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1201 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1202 | output_section, object, | |
1203 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1204 | } |
1205 | else | |
1206 | { | |
96f2030e | 1207 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1208 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1209 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1210 | } |
1211 | } | |
1212 | } | |
1213 | break; | |
1214 | ||
1215 | case elfcpp::R_386_PC32: | |
1216 | case elfcpp::R_386_PC16: | |
1217 | case elfcpp::R_386_PC8: | |
1218 | { | |
1219 | // Make a PLT entry if necessary. | |
1220 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1221 | { |
1222 | // These relocations are used for function calls only in | |
1223 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1224 | // we'll need a text relocation anyway, so we can skip the | |
1225 | // PLT entry and let the dynamic linker bind the call directly | |
1226 | // to the target. For smaller relocations, we should use a | |
1227 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1228 | if (!parameters->options().shared() |
7bf1f802 ILT |
1229 | || r_type != elfcpp::R_386_PC32) |
1230 | target->make_plt_entry(symtab, layout, gsym); | |
1231 | } | |
d61c6bd4 | 1232 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1233 | int flags = Symbol::NON_PIC_REF; |
1234 | if (gsym->type() == elfcpp::STT_FUNC) | |
1235 | flags |= Symbol::FUNCTION_CALL; | |
1236 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1237 | { |
d61c6bd4 ILT |
1238 | if (target->may_need_copy_reloc(gsym)) |
1239 | { | |
07f397ab | 1240 | target->copy_reloc(&options, symtab, layout, object, |
4f4c5f80 | 1241 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1242 | } |
86849f1f | 1243 | else |
d61c6bd4 ILT |
1244 | { |
1245 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1246 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1247 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1248 | } |
96f2030e ILT |
1249 | } |
1250 | } | |
92e059d8 ILT |
1251 | break; |
1252 | ||
ead1e424 | 1253 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1254 | { |
1255 | // The symbol requires a GOT entry. | |
7e1edb90 | 1256 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1257 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1258 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1259 | else |
1260 | { | |
8462ae85 | 1261 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1262 | // GOT entry with a dynamic relocation. |
1263 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1264 | if (gsym->is_from_dynobj() |
1265 | || gsym->is_undefined() | |
1266 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1267 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1268 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1269 | else |
8462ae85 | 1270 | { |
0a65a3a7 CC |
1271 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1272 | rel_dyn->add_global_relative( | |
1273 | gsym, elfcpp::R_386_RELATIVE, got, | |
1274 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1275 | } |
1276 | } | |
1277 | } | |
ead1e424 ILT |
1278 | break; |
1279 | ||
1280 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1281 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1282 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1283 | if (gsym->final_value_is_known()) |
ead1e424 | 1284 | break; |
436ca963 ILT |
1285 | // If building a shared library, we can also skip the PLT entry |
1286 | // if the symbol is defined in the output file and is protected | |
1287 | // or hidden. | |
1288 | if (gsym->is_defined() | |
1289 | && !gsym->is_from_dynobj() | |
1290 | && !gsym->is_preemptible()) | |
1291 | break; | |
7e1edb90 | 1292 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1293 | break; |
1294 | ||
1295 | case elfcpp::R_386_GOTOFF: | |
1296 | case elfcpp::R_386_GOTPC: | |
1297 | // We need a GOT section. | |
7e1edb90 | 1298 | target->got_section(symtab, layout); |
ead1e424 ILT |
1299 | break; |
1300 | ||
af6359d5 ILT |
1301 | // These are relocations which should only be seen by the |
1302 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1303 | case elfcpp::R_386_COPY: |
1304 | case elfcpp::R_386_GLOB_DAT: | |
1305 | case elfcpp::R_386_JUMP_SLOT: | |
1306 | case elfcpp::R_386_RELATIVE: | |
1307 | case elfcpp::R_386_TLS_TPOFF: | |
1308 | case elfcpp::R_386_TLS_DTPMOD32: | |
1309 | case elfcpp::R_386_TLS_DTPOFF32: | |
1310 | case elfcpp::R_386_TLS_TPOFF32: | |
1311 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1312 | gold_error(_("%s: unexpected reloc %u in object file"), |
1313 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1314 | break; |
1315 | ||
d61c17ea ILT |
1316 | // These are initial tls relocs, which are expected when |
1317 | // linking. | |
56622147 ILT |
1318 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1319 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1320 | case elfcpp::R_386_TLS_DESC_CALL: | |
1321 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1322 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1323 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1324 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1325 | case elfcpp::R_386_TLS_GOTIE: |
1326 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1327 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1328 | { |
7e1edb90 | 1329 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1330 | const tls::Tls_optimization optimized_type |
1331 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1332 | switch (r_type) |
1333 | { | |
56622147 | 1334 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1335 | if (optimized_type == tls::TLSOPT_NONE) |
1336 | { | |
1337 | // Create a pair of GOT entries for the module index and | |
1338 | // dtv-relative offset. | |
1339 | Output_data_got<32, false>* got | |
1340 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1341 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1342 | target->rel_dyn_section(layout), |
1343 | elfcpp::R_386_TLS_DTPMOD32, | |
1344 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1345 | } |
1346 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1347 | { | |
1348 | // Create a GOT entry for the tp-relative offset. | |
1349 | Output_data_got<32, false>* got | |
1350 | = target->got_section(symtab, layout); | |
c2b45e22 | 1351 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1352 | target->rel_dyn_section(layout), |
c2b45e22 | 1353 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1354 | } |
1355 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1356 | unsupported_reloc_global(object, r_type, gsym); | |
1357 | break; | |
1358 | ||
56622147 | 1359 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
c2b45e22 CC |
1360 | if (optimized_type == tls::TLSOPT_NONE) |
1361 | { | |
1362 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1363 | Output_data_got<32, false>* got | |
1364 | = target->got_section(symtab, layout); | |
1365 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1366 | target->rel_dyn_section(layout), | |
1367 | elfcpp::R_386_TLS_DESC, 0); | |
1368 | } | |
1369 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1370 | { | |
1371 | // Create a GOT entry for the tp-relative offset. | |
1372 | Output_data_got<32, false>* got | |
1373 | = target->got_section(symtab, layout); | |
1374 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1375 | target->rel_dyn_section(layout), | |
1376 | elfcpp::R_386_TLS_TPOFF); | |
1377 | } | |
1378 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1379 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1380 | break; |
1381 | ||
1382 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1383 | break; |
1384 | ||
56622147 | 1385 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1386 | if (optimized_type == tls::TLSOPT_NONE) |
1387 | { | |
1388 | // Create a GOT entry for the module index. | |
94c4710f | 1389 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1390 | } |
1391 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1392 | unsupported_reloc_global(object, r_type, gsym); |
1393 | break; | |
1394 | ||
56622147 | 1395 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1396 | break; |
1397 | ||
56622147 ILT |
1398 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1399 | case elfcpp::R_386_TLS_IE_32: | |
1400 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1401 | layout->set_has_static_tls(); |
07f397ab ILT |
1402 | if (optimized_type == tls::TLSOPT_NONE) |
1403 | { | |
7bf1f802 ILT |
1404 | // For the R_386_TLS_IE relocation, we need to create a |
1405 | // dynamic relocation when building a shared library. | |
1406 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1407 | && parameters->options().shared()) |
07f397ab | 1408 | { |
07f397ab | 1409 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1410 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1411 | output_section, object, | |
1412 | data_shndx, | |
1413 | reloc.get_r_offset()); | |
07f397ab | 1414 | } |
7bf1f802 ILT |
1415 | // Create a GOT entry for the tp-relative offset. |
1416 | Output_data_got<32, false>* got | |
1417 | = target->got_section(symtab, layout); | |
1418 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1419 | ? elfcpp::R_386_TLS_TPOFF32 | |
1420 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1421 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1422 | ? GOT_TYPE_TLS_OFFSET | |
1423 | : GOT_TYPE_TLS_NOFFSET); | |
1424 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1425 | target->rel_dyn_section(layout), |
1426 | dyn_r_type); | |
07f397ab ILT |
1427 | } |
1428 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1429 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1430 | break; |
af6359d5 | 1431 | |
56622147 ILT |
1432 | case elfcpp::R_386_TLS_LE: // Local-exec |
1433 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1434 | layout->set_has_static_tls(); |
8851ecca | 1435 | if (parameters->options().shared()) |
7bf1f802 ILT |
1436 | { |
1437 | // We need to create a dynamic relocation. | |
1438 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1439 | ? elfcpp::R_386_TLS_TPOFF32 | |
1440 | : elfcpp::R_386_TLS_TPOFF); | |
1441 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1442 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1443 | data_shndx, reloc.get_r_offset()); | |
1444 | } | |
56622147 ILT |
1445 | break; |
1446 | ||
af6359d5 ILT |
1447 | default: |
1448 | gold_unreachable(); | |
a3ad94ed ILT |
1449 | } |
1450 | } | |
92e059d8 ILT |
1451 | break; |
1452 | ||
92e059d8 ILT |
1453 | case elfcpp::R_386_32PLT: |
1454 | case elfcpp::R_386_TLS_GD_32: | |
1455 | case elfcpp::R_386_TLS_GD_PUSH: | |
1456 | case elfcpp::R_386_TLS_GD_CALL: | |
1457 | case elfcpp::R_386_TLS_GD_POP: | |
1458 | case elfcpp::R_386_TLS_LDM_32: | |
1459 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1460 | case elfcpp::R_386_TLS_LDM_CALL: | |
1461 | case elfcpp::R_386_TLS_LDM_POP: | |
1462 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1463 | default: | |
af6359d5 | 1464 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1465 | break; |
1466 | } | |
1467 | } | |
1468 | ||
1469 | // Scan relocations for a section. | |
1470 | ||
1471 | void | |
1472 | Target_i386::scan_relocs(const General_options& options, | |
1473 | Symbol_table* symtab, | |
ead1e424 | 1474 | Layout* layout, |
f6ce93d6 | 1475 | Sized_relobj<32, false>* object, |
a3ad94ed | 1476 | unsigned int data_shndx, |
92e059d8 ILT |
1477 | unsigned int sh_type, |
1478 | const unsigned char* prelocs, | |
1479 | size_t reloc_count, | |
730cdc88 ILT |
1480 | Output_section* output_section, |
1481 | bool needs_special_offset_handling, | |
92e059d8 | 1482 | size_t local_symbol_count, |
730cdc88 | 1483 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1484 | { |
1485 | if (sh_type == elfcpp::SHT_RELA) | |
1486 | { | |
75f2446e ILT |
1487 | gold_error(_("%s: unsupported RELA reloc section"), |
1488 | object->name().c_str()); | |
1489 | return; | |
92e059d8 ILT |
1490 | } |
1491 | ||
ead1e424 ILT |
1492 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1493 | Target_i386::Scan>( | |
92e059d8 ILT |
1494 | options, |
1495 | symtab, | |
ead1e424 ILT |
1496 | layout, |
1497 | this, | |
92e059d8 | 1498 | object, |
a3ad94ed | 1499 | data_shndx, |
92e059d8 ILT |
1500 | prelocs, |
1501 | reloc_count, | |
730cdc88 ILT |
1502 | output_section, |
1503 | needs_special_offset_handling, | |
92e059d8 | 1504 | local_symbol_count, |
730cdc88 | 1505 | plocal_symbols); |
92e059d8 ILT |
1506 | } |
1507 | ||
16649710 | 1508 | // Finalize the sections. |
5a6f7e2d ILT |
1509 | |
1510 | void | |
7e1edb90 | 1511 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1512 | { |
16649710 ILT |
1513 | // Fill in some more dynamic tags. |
1514 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1515 | if (odyn != NULL) | |
1516 | { | |
1517 | if (this->got_plt_ != NULL) | |
1518 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1519 | ||
1520 | if (this->plt_ != NULL) | |
1521 | { | |
1522 | const Output_data* od = this->plt_->rel_plt(); | |
1523 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1524 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1525 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1526 | } | |
1527 | ||
1528 | if (this->rel_dyn_ != NULL) | |
1529 | { | |
1530 | const Output_data* od = this->rel_dyn_; | |
1531 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1532 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1533 | odyn->add_constant(elfcpp::DT_RELENT, | |
1534 | elfcpp::Elf_sizes<32>::rel_size); | |
1535 | } | |
1536 | ||
8851ecca | 1537 | if (!parameters->options().shared()) |
16649710 ILT |
1538 | { |
1539 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1540 | // linker at run time, and used by the debugger. | |
1541 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1546 | // relocs. | |
5a6f7e2d ILT |
1547 | if (this->copy_relocs_ == NULL) |
1548 | return; | |
1549 | if (this->copy_relocs_->any_to_emit()) | |
1550 | { | |
1551 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1552 | this->copy_relocs_->emit(rel_dyn); | |
1553 | } | |
1554 | delete this->copy_relocs_; | |
1555 | this->copy_relocs_ = NULL; | |
1556 | } | |
1557 | ||
86849f1f ILT |
1558 | // Return whether a direct absolute static relocation needs to be applied. |
1559 | // In cases where Scan::local() or Scan::global() has created | |
1560 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1561 | // of the relocation is carried in the data, and we must not | |
1562 | // apply the static relocation. | |
1563 | ||
1564 | inline bool | |
1565 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1566 | int ref_flags, |
86849f1f ILT |
1567 | bool is_32bit) |
1568 | { | |
d61c6bd4 ILT |
1569 | // For local symbols, we will have created a non-RELATIVE dynamic |
1570 | // relocation only if (a) the output is position independent, | |
1571 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1572 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1573 | if (gsym == NULL) |
8851ecca | 1574 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1575 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1576 | && !is_32bit); |
86849f1f | 1577 | |
0700cf32 ILT |
1578 | // For global symbols, we use the same helper routines used in the |
1579 | // scan pass. If we did not create a dynamic relocation, or if we | |
1580 | // created a RELATIVE dynamic relocation, we should apply the static | |
1581 | // relocation. | |
1582 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1583 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1584 | && gsym->can_use_relative_reloc(ref_flags | |
1585 | & Symbol::FUNCTION_CALL); | |
1586 | return !has_dyn || is_rel; | |
86849f1f ILT |
1587 | } |
1588 | ||
61ba1cf9 ILT |
1589 | // Perform a relocation. |
1590 | ||
ead1e424 | 1591 | inline bool |
92e059d8 | 1592 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1593 | Target_i386* target, |
92e059d8 ILT |
1594 | size_t relnum, |
1595 | const elfcpp::Rel<32, false>& rel, | |
1596 | unsigned int r_type, | |
c06b7b0b | 1597 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1598 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1599 | unsigned char* view, |
1600 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1601 | section_size_type view_size) |
61ba1cf9 | 1602 | { |
ead1e424 ILT |
1603 | if (this->skip_call_tls_get_addr_) |
1604 | { | |
1605 | if (r_type != elfcpp::R_386_PLT32 | |
1606 | || gsym == NULL | |
1607 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1608 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1609 | _("missing expected TLS relocation")); | |
1610 | else | |
ead1e424 | 1611 | { |
75f2446e ILT |
1612 | this->skip_call_tls_get_addr_ = false; |
1613 | return false; | |
ead1e424 | 1614 | } |
ead1e424 ILT |
1615 | } |
1616 | ||
a3ad94ed | 1617 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1618 | Symbol_value<32> symval; |
0700cf32 ILT |
1619 | bool is_nonpic = (r_type == elfcpp::R_386_PC8 |
1620 | || r_type == elfcpp::R_386_PC16 | |
1621 | || r_type == elfcpp::R_386_PC32); | |
436ca963 ILT |
1622 | if (gsym != NULL |
1623 | && (gsym->is_from_dynobj() | |
8851ecca | 1624 | || (parameters->options().shared() |
8fc19601 | 1625 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
0700cf32 | 1626 | && gsym->has_plt_offset() |
8851ecca | 1627 | && (!is_nonpic || !parameters->options().shared())) |
a3ad94ed | 1628 | { |
b8e6aad9 ILT |
1629 | symval.set_output_value(target->plt_section()->address() |
1630 | + gsym->plt_offset()); | |
1631 | psymval = &symval; | |
a3ad94ed ILT |
1632 | } |
1633 | ||
b8e6aad9 ILT |
1634 | const Sized_relobj<32, false>* object = relinfo->object; |
1635 | ||
1b64748b | 1636 | // Get the GOT offset if needed. |
96f2030e ILT |
1637 | // The GOT pointer points to the end of the GOT section. |
1638 | // We need to subtract the size of the GOT section to get | |
1639 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1640 | bool have_got_offset = false; |
1641 | unsigned int got_offset = 0; | |
1642 | switch (r_type) | |
1643 | { | |
1644 | case elfcpp::R_386_GOT32: | |
1645 | if (gsym != NULL) | |
1646 | { | |
0a65a3a7 CC |
1647 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1648 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1649 | - target->got_size()); | |
1b64748b ILT |
1650 | } |
1651 | else | |
1652 | { | |
1653 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1654 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1655 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1656 | - target->got_size()); | |
1b64748b ILT |
1657 | } |
1658 | have_got_offset = true; | |
1659 | break; | |
1660 | ||
1661 | default: | |
1662 | break; | |
1663 | } | |
1664 | ||
61ba1cf9 ILT |
1665 | switch (r_type) |
1666 | { | |
1667 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1668 | case elfcpp::R_386_GNU_VTINHERIT: |
1669 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1670 | break; |
1671 | ||
1672 | case elfcpp::R_386_32: | |
0700cf32 | 1673 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true)) |
86849f1f | 1674 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1675 | break; |
1676 | ||
1677 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1678 | { |
0700cf32 ILT |
1679 | int ref_flags = Symbol::NON_PIC_REF; |
1680 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1681 | ref_flags |= Symbol::FUNCTION_CALL; | |
1682 | if (should_apply_static_reloc(gsym, ref_flags, true)) | |
d61c6bd4 ILT |
1683 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1684 | } | |
92e059d8 ILT |
1685 | break; |
1686 | ||
1687 | case elfcpp::R_386_16: | |
0700cf32 | 1688 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1689 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1690 | break; |
1691 | ||
1692 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1693 | { |
0700cf32 ILT |
1694 | int ref_flags = Symbol::NON_PIC_REF; |
1695 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1696 | ref_flags |= Symbol::FUNCTION_CALL; | |
1697 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1698 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1699 | } | |
61ba1cf9 ILT |
1700 | break; |
1701 | ||
92e059d8 | 1702 | case elfcpp::R_386_8: |
0700cf32 | 1703 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1704 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1705 | break; |
1706 | ||
1707 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1708 | { |
0700cf32 ILT |
1709 | int ref_flags = Symbol::NON_PIC_REF; |
1710 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1711 | ref_flags |= Symbol::FUNCTION_CALL; | |
1712 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1713 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1714 | } | |
92e059d8 ILT |
1715 | break; |
1716 | ||
ead1e424 | 1717 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1718 | gold_assert(gsym == NULL |
1719 | || gsym->has_plt_offset() | |
99f8faca ILT |
1720 | || gsym->final_value_is_known() |
1721 | || (gsym->is_defined() | |
1722 | && !gsym->is_from_dynobj() | |
1723 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1724 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1725 | break; |
1726 | ||
1727 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1728 | gold_assert(have_got_offset); |
1729 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1730 | break; |
1731 | ||
1732 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1733 | { |
1734 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1735 | value = (psymval->value(object, 0) | |
96f2030e | 1736 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1737 | Relocate_functions<32, false>::rel32(view, value); |
1738 | } | |
ead1e424 ILT |
1739 | break; |
1740 | ||
1741 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1742 | { |
1743 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1744 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1745 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1746 | } | |
ead1e424 ILT |
1747 | break; |
1748 | ||
92e059d8 ILT |
1749 | case elfcpp::R_386_COPY: |
1750 | case elfcpp::R_386_GLOB_DAT: | |
1751 | case elfcpp::R_386_JUMP_SLOT: | |
1752 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1753 | // These are outstanding tls relocs, which are unexpected when |
1754 | // linking. | |
92e059d8 ILT |
1755 | case elfcpp::R_386_TLS_TPOFF: |
1756 | case elfcpp::R_386_TLS_DTPMOD32: | |
1757 | case elfcpp::R_386_TLS_DTPOFF32: | |
1758 | case elfcpp::R_386_TLS_TPOFF32: | |
1759 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1760 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1761 | _("unexpected reloc %u in object file"), | |
1762 | r_type); | |
92e059d8 ILT |
1763 | break; |
1764 | ||
d61c17ea ILT |
1765 | // These are initial tls relocs, which are expected when |
1766 | // linking. | |
56622147 ILT |
1767 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1768 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1769 | case elfcpp::R_386_TLS_DESC_CALL: | |
1770 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1771 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1772 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1773 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1774 | case elfcpp::R_386_TLS_GOTIE: |
1775 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1776 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1777 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1778 | view, address, view_size); | |
92e059d8 ILT |
1779 | break; |
1780 | ||
92e059d8 ILT |
1781 | case elfcpp::R_386_32PLT: |
1782 | case elfcpp::R_386_TLS_GD_32: | |
1783 | case elfcpp::R_386_TLS_GD_PUSH: | |
1784 | case elfcpp::R_386_TLS_GD_CALL: | |
1785 | case elfcpp::R_386_TLS_GD_POP: | |
1786 | case elfcpp::R_386_TLS_LDM_32: | |
1787 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1788 | case elfcpp::R_386_TLS_LDM_CALL: | |
1789 | case elfcpp::R_386_TLS_LDM_POP: | |
1790 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1791 | default: |
75f2446e ILT |
1792 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1793 | _("unsupported reloc %u"), | |
1794 | r_type); | |
92e059d8 ILT |
1795 | break; |
1796 | } | |
ead1e424 ILT |
1797 | |
1798 | return true; | |
92e059d8 ILT |
1799 | } |
1800 | ||
1801 | // Perform a TLS relocation. | |
1802 | ||
1803 | inline void | |
1804 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1805 | Target_i386* target, |
92e059d8 ILT |
1806 | size_t relnum, |
1807 | const elfcpp::Rel<32, false>& rel, | |
1808 | unsigned int r_type, | |
c06b7b0b | 1809 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1810 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1811 | unsigned char* view, |
1812 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1813 | section_size_type view_size) |
92e059d8 ILT |
1814 | { |
1815 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1816 | |
07f397ab ILT |
1817 | const Sized_relobj<32, false>* object = relinfo->object; |
1818 | ||
1819 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1820 | |
8851ecca ILT |
1821 | const bool is_final = |
1822 | (gsym == NULL | |
1823 | ? !parameters->options().output_is_position_independent() | |
1824 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1825 | const tls::Tls_optimization optimized_type |
1826 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1827 | switch (r_type) |
1828 | { | |
56622147 | 1829 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1830 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1831 | { |
07f397ab | 1832 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1833 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1834 | rel, r_type, value, view, | |
1835 | view_size); | |
92e059d8 ILT |
1836 | break; |
1837 | } | |
07f397ab ILT |
1838 | else |
1839 | { | |
c2b45e22 CC |
1840 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1841 | ? GOT_TYPE_TLS_NOFFSET | |
1842 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1843 | unsigned int got_offset; |
1844 | if (gsym != NULL) | |
1845 | { | |
c2b45e22 CC |
1846 | gold_assert(gsym->has_got_offset(got_type)); |
1847 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1848 | } |
1849 | else | |
1850 | { | |
1851 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1852 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1853 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1854 | - target->got_size()); |
1855 | } | |
1856 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1857 | { | |
1858 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1859 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1860 | got_offset, view, view_size); | |
07f397ab ILT |
1861 | break; |
1862 | } | |
1863 | else if (optimized_type == tls::TLSOPT_NONE) | |
1864 | { | |
1865 | // Relocate the field with the offset of the pair of GOT | |
1866 | // entries. | |
1867 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1868 | break; | |
1869 | } | |
1870 | } | |
75f2446e ILT |
1871 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1872 | _("unsupported reloc %u"), | |
1873 | r_type); | |
92e059d8 ILT |
1874 | break; |
1875 | ||
56622147 ILT |
1876 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1877 | case elfcpp::R_386_TLS_DESC_CALL: | |
c2b45e22 CC |
1878 | if (optimized_type == tls::TLSOPT_TO_LE) |
1879 | { | |
1880 | gold_assert(tls_segment != NULL); | |
1881 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1882 | rel, r_type, value, view, | |
1883 | view_size); | |
1884 | break; | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1889 | ? GOT_TYPE_TLS_NOFFSET | |
1890 | : GOT_TYPE_TLS_DESC); | |
1891 | unsigned int got_offset; | |
1892 | if (gsym != NULL) | |
1893 | { | |
1894 | gold_assert(gsym->has_got_offset(got_type)); | |
1895 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1896 | } | |
1897 | else | |
1898 | { | |
1899 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1900 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1901 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1902 | - target->got_size()); | |
1903 | } | |
1904 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1905 | { | |
1906 | gold_assert(tls_segment != NULL); | |
1907 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1908 | got_offset, view, view_size); | |
1909 | break; | |
1910 | } | |
1911 | else if (optimized_type == tls::TLSOPT_NONE) | |
1912 | { | |
1913 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1914 | { | |
1915 | // Relocate the field with the offset of the pair of GOT | |
1916 | // entries. | |
1917 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1918 | } | |
1919 | break; | |
1920 | } | |
1921 | } | |
75f2446e ILT |
1922 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1923 | _("unsupported reloc %u"), | |
1924 | r_type); | |
ead1e424 ILT |
1925 | break; |
1926 | ||
56622147 | 1927 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1928 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1929 | { | |
75f2446e ILT |
1930 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1931 | _("both SUN and GNU model " | |
1932 | "TLS relocations")); | |
1933 | break; | |
46cf9fa2 ILT |
1934 | } |
1935 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1936 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1937 | { |
07f397ab | 1938 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1939 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1940 | value, view, view_size); | |
1941 | break; | |
1942 | } | |
07f397ab ILT |
1943 | else if (optimized_type == tls::TLSOPT_NONE) |
1944 | { | |
1945 | // Relocate the field with the offset of the GOT entry for | |
1946 | // the module index. | |
1947 | unsigned int got_offset; | |
94c4710f ILT |
1948 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1949 | - target->got_size()); | |
07f397ab ILT |
1950 | Relocate_functions<32, false>::rel32(view, got_offset); |
1951 | break; | |
1952 | } | |
75f2446e ILT |
1953 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1954 | _("unsupported reloc %u"), | |
1955 | r_type); | |
46cf9fa2 ILT |
1956 | break; |
1957 | ||
56622147 | 1958 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1959 | // This reloc can appear in debugging sections, in which case we |
1960 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1961 | // tells us this. | |
94c4710f ILT |
1962 | if (optimized_type == tls::TLSOPT_TO_LE) |
1963 | { | |
1964 | gold_assert(tls_segment != NULL); | |
1965 | value -= tls_segment->memsz(); | |
1966 | } | |
46cf9fa2 ILT |
1967 | Relocate_functions<32, false>::rel32(view, value); |
1968 | break; | |
1969 | ||
56622147 ILT |
1970 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1971 | case elfcpp::R_386_TLS_GOTIE: | |
1972 | case elfcpp::R_386_TLS_IE_32: | |
1973 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1974 | { | |
07f397ab | 1975 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1976 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1977 | rel, r_type, value, view, | |
1978 | view_size); | |
1979 | break; | |
1980 | } | |
07f397ab ILT |
1981 | else if (optimized_type == tls::TLSOPT_NONE) |
1982 | { | |
1983 | // Relocate the field with the offset of the GOT entry for | |
1984 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
1985 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1986 | ? GOT_TYPE_TLS_OFFSET | |
1987 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
1988 | unsigned int got_offset; |
1989 | if (gsym != NULL) | |
1990 | { | |
c2b45e22 CC |
1991 | gold_assert(gsym->has_got_offset(got_type)); |
1992 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
1993 | } |
1994 | else | |
1995 | { | |
1996 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1997 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1998 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
1999 | } |
2000 | // For the R_386_TLS_IE relocation, we need to apply the | |
2001 | // absolute address of the GOT entry. | |
2002 | if (r_type == elfcpp::R_386_TLS_IE) | |
2003 | got_offset += target->got_plt_section()->address(); | |
2004 | // All GOT offsets are relative to the end of the GOT. | |
2005 | got_offset -= target->got_size(); | |
2006 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2007 | break; | |
2008 | } | |
75f2446e ILT |
2009 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2010 | _("unsupported reloc %u"), | |
2011 | r_type); | |
92e059d8 | 2012 | break; |
92e059d8 | 2013 | |
56622147 | 2014 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2015 | // If we're creating a shared library, a dynamic relocation will |
2016 | // have been created for this location, so do not apply it now. | |
8851ecca | 2017 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2018 | { |
2019 | gold_assert(tls_segment != NULL); | |
2020 | value -= tls_segment->memsz(); | |
2021 | Relocate_functions<32, false>::rel32(view, value); | |
2022 | } | |
56622147 | 2023 | break; |
92e059d8 | 2024 | |
56622147 | 2025 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2026 | // If we're creating a shared library, a dynamic relocation will |
2027 | // have been created for this location, so do not apply it now. | |
8851ecca | 2028 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2029 | { |
2030 | gold_assert(tls_segment != NULL); | |
2031 | value = tls_segment->memsz() - value; | |
2032 | Relocate_functions<32, false>::rel32(view, value); | |
2033 | } | |
56622147 | 2034 | break; |
92e059d8 | 2035 | } |
92e059d8 ILT |
2036 | } |
2037 | ||
e041f13d | 2038 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2039 | // Local-Exec. |
2040 | ||
2041 | inline void | |
2042 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2043 | size_t relnum, | |
2044 | Output_segment* tls_segment, | |
2045 | const elfcpp::Rel<32, false>& rel, | |
2046 | unsigned int, | |
2047 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2048 | unsigned char* view, | |
fe8718a4 | 2049 | section_size_type view_size) |
ead1e424 ILT |
2050 | { |
2051 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2052 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2053 | // leal foo(%reg),%eax; call ___tls_get_addr |
2054 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2055 | ||
af6359d5 ILT |
2056 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2057 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2058 | |
2059 | unsigned char op1 = view[-1]; | |
2060 | unsigned char op2 = view[-2]; | |
2061 | ||
af6359d5 ILT |
2062 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2063 | op2 == 0x8d || op2 == 0x04); | |
2064 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2065 | |
2066 | int roff = 5; | |
2067 | ||
2068 | if (op2 == 0x04) | |
2069 | { | |
af6359d5 ILT |
2070 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2071 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2072 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2073 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2074 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2075 | } | |
2076 | else | |
2077 | { | |
af6359d5 ILT |
2078 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2079 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2080 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2081 | && view[9] == 0x90) |
ead1e424 ILT |
2082 | { |
2083 | // There is a trailing nop. Use the size byte subl. | |
2084 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2085 | roff = 6; | |
2086 | } | |
2087 | else | |
2088 | { | |
2089 | // Use the five byte subl. | |
2090 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2091 | } | |
2092 | } | |
2093 | ||
7bf1f802 | 2094 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2095 | Relocate_functions<32, false>::rel32(view + roff, value); |
2096 | ||
2097 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2098 | // We can skip it. | |
2099 | this->skip_call_tls_get_addr_ = true; | |
2100 | } | |
2101 | ||
7bf1f802 | 2102 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2103 | // Initial-Exec. |
2104 | ||
2105 | inline void | |
2106 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2107 | size_t relnum, | |
c2b45e22 | 2108 | Output_segment*, |
07f397ab ILT |
2109 | const elfcpp::Rel<32, false>& rel, |
2110 | unsigned int, | |
2111 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2112 | unsigned char* view, | |
fe8718a4 | 2113 | section_size_type view_size) |
07f397ab ILT |
2114 | { |
2115 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2116 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2117 | ||
2118 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2119 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2120 | ||
2121 | unsigned char op1 = view[-1]; | |
2122 | unsigned char op2 = view[-2]; | |
2123 | ||
2124 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2125 | op2 == 0x8d || op2 == 0x04); | |
2126 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2127 | ||
2128 | int roff = 5; | |
2129 | ||
c2b45e22 CC |
2130 | // FIXME: For now, support only the first (SIB) form. |
2131 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2132 | |
2133 | if (op2 == 0x04) | |
2134 | { | |
2135 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2136 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2137 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2138 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2139 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2140 | } | |
2141 | else | |
2142 | { | |
2143 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2144 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2145 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2146 | && view[9] == 0x90) |
2147 | { | |
2148 | // FIXME: This is not the right instruction sequence. | |
2149 | // There is a trailing nop. Use the size byte subl. | |
2150 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2151 | roff = 6; | |
2152 | } | |
2153 | else | |
2154 | { | |
2155 | // FIXME: This is not the right instruction sequence. | |
2156 | // Use the five byte subl. | |
2157 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2158 | } | |
2159 | } | |
2160 | ||
07f397ab ILT |
2161 | Relocate_functions<32, false>::rel32(view + roff, value); |
2162 | ||
2163 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2164 | // We can skip it. | |
2165 | this->skip_call_tls_get_addr_ = true; | |
2166 | } | |
2167 | ||
c2b45e22 CC |
2168 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2169 | // General-Dynamic to a Local-Exec. | |
2170 | ||
2171 | inline void | |
2172 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2173 | const Relocate_info<32, false>* relinfo, | |
2174 | size_t relnum, | |
2175 | Output_segment* tls_segment, | |
2176 | const elfcpp::Rel<32, false>& rel, | |
2177 | unsigned int r_type, | |
2178 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2179 | unsigned char* view, | |
2180 | section_size_type view_size) | |
2181 | { | |
2182 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2183 | { | |
2184 | // leal foo@TLSDESC(%ebx), %eax | |
2185 | // ==> leal foo@NTPOFF, %eax | |
2186 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2187 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2188 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2189 | view[-2] == 0x8d && view[-1] == 0x83); | |
2190 | view[-1] = 0x05; | |
2191 | value -= tls_segment->memsz(); | |
2192 | Relocate_functions<32, false>::rel32(view, value); | |
2193 | } | |
2194 | else | |
2195 | { | |
2196 | // call *foo@TLSCALL(%eax) | |
2197 | // ==> nop; nop | |
2198 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2199 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2200 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2201 | view[0] == 0xff && view[1] == 0x10); | |
2202 | view[0] = 0x66; | |
2203 | view[1] = 0x90; | |
2204 | } | |
2205 | } | |
2206 | ||
2207 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2208 | // General-Dynamic to an Initial-Exec. | |
2209 | ||
2210 | inline void | |
2211 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2212 | const Relocate_info<32, false>* relinfo, | |
2213 | size_t relnum, | |
2214 | Output_segment*, | |
2215 | const elfcpp::Rel<32, false>& rel, | |
2216 | unsigned int r_type, | |
2217 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2218 | unsigned char* view, | |
2219 | section_size_type view_size) | |
2220 | { | |
2221 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2222 | { | |
2223 | // leal foo@TLSDESC(%ebx), %eax | |
2224 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2225 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2226 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2227 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2228 | view[-2] == 0x8d && view[-1] == 0x83); | |
2229 | view[-2] = 0x8b; | |
2230 | Relocate_functions<32, false>::rel32(view, value); | |
2231 | } | |
2232 | else | |
2233 | { | |
2234 | // call *foo@TLSCALL(%eax) | |
2235 | // ==> nop; nop | |
2236 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2237 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2238 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2239 | view[0] == 0xff && view[1] == 0x10); | |
2240 | view[0] = 0x66; | |
2241 | view[1] = 0x90; | |
2242 | } | |
2243 | } | |
2244 | ||
46cf9fa2 ILT |
2245 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2246 | // Local-Exec. | |
2247 | ||
2248 | inline void | |
2249 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2250 | size_t relnum, | |
2251 | Output_segment*, | |
2252 | const elfcpp::Rel<32, false>& rel, | |
2253 | unsigned int, | |
2254 | elfcpp::Elf_types<32>::Elf_Addr, | |
2255 | unsigned char* view, | |
fe8718a4 | 2256 | section_size_type view_size) |
46cf9fa2 ILT |
2257 | { |
2258 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2259 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2260 | ||
af6359d5 ILT |
2261 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2262 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2263 | |
2264 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2265 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2266 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2267 | |
af6359d5 | 2268 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2269 | |
2270 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2271 | ||
2272 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2273 | // We can skip it. | |
2274 | this->skip_call_tls_get_addr_ = true; | |
2275 | } | |
2276 | ||
56622147 ILT |
2277 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2278 | // Local-Exec. | |
2279 | ||
2280 | inline void | |
2281 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2282 | size_t relnum, | |
2283 | Output_segment* tls_segment, | |
2284 | const elfcpp::Rel<32, false>& rel, | |
2285 | unsigned int r_type, | |
2286 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2287 | unsigned char* view, | |
fe8718a4 | 2288 | section_size_type view_size) |
56622147 ILT |
2289 | { |
2290 | // We have to actually change the instructions, which means that we | |
2291 | // need to examine the opcodes to figure out which instruction we | |
2292 | // are looking at. | |
2293 | if (r_type == elfcpp::R_386_TLS_IE) | |
2294 | { | |
2295 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2296 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2297 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2298 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2299 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2300 | ||
2301 | unsigned char op1 = view[-1]; | |
2302 | if (op1 == 0xa1) | |
2303 | { | |
2304 | // movl XX,%eax ==> movl $YY,%eax | |
2305 | view[-1] = 0xb8; | |
2306 | } | |
2307 | else | |
2308 | { | |
2309 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2310 | ||
2311 | unsigned char op2 = view[-2]; | |
2312 | if (op2 == 0x8b) | |
2313 | { | |
2314 | // movl XX,%reg ==> movl $YY,%reg | |
2315 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2316 | (op1 & 0xc7) == 0x05); | |
2317 | view[-2] = 0xc7; | |
2318 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2319 | } | |
2320 | else if (op2 == 0x03) | |
2321 | { | |
2322 | // addl XX,%reg ==> addl $YY,%reg | |
2323 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2324 | (op1 & 0xc7) == 0x05); | |
2325 | view[-2] = 0x81; | |
2326 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2327 | } | |
2328 | else | |
2329 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2330 | } | |
2331 | } | |
2332 | else | |
2333 | { | |
2334 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2335 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2336 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2337 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2338 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2339 | ||
2340 | unsigned char op1 = view[-1]; | |
2341 | unsigned char op2 = view[-2]; | |
2342 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2343 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2344 | if (op2 == 0x8b) | |
2345 | { | |
2346 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2347 | view[-2] = 0xc7; | |
2348 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2349 | } | |
2350 | else if (op2 == 0x2b) | |
2351 | { | |
2352 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2353 | view[-2] = 0x81; | |
2354 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2355 | } | |
2356 | else if (op2 == 0x03) | |
2357 | { | |
2358 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2359 | view[-2] = 0x81; | |
2360 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2361 | } | |
2362 | else | |
2363 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2364 | } | |
2365 | ||
7bf1f802 | 2366 | value = tls_segment->memsz() - value; |
56622147 ILT |
2367 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2368 | value = - value; | |
2369 | ||
2370 | Relocate_functions<32, false>::rel32(view, value); | |
2371 | } | |
2372 | ||
61ba1cf9 ILT |
2373 | // Relocate section data. |
2374 | ||
2375 | void | |
92e059d8 | 2376 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2377 | unsigned int sh_type, |
2378 | const unsigned char* prelocs, | |
2379 | size_t reloc_count, | |
730cdc88 ILT |
2380 | Output_section* output_section, |
2381 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2382 | unsigned char* view, |
2383 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2384 | section_size_type view_size) |
61ba1cf9 | 2385 | { |
a3ad94ed | 2386 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2387 | |
ead1e424 ILT |
2388 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2389 | Target_i386::Relocate>( | |
92e059d8 | 2390 | relinfo, |
ead1e424 | 2391 | this, |
61ba1cf9 ILT |
2392 | prelocs, |
2393 | reloc_count, | |
730cdc88 ILT |
2394 | output_section, |
2395 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2396 | view, |
2397 | address, | |
2398 | view_size); | |
2399 | } | |
2400 | ||
6a74a719 ILT |
2401 | // Return the size of a relocation while scanning during a relocatable |
2402 | // link. | |
2403 | ||
2404 | unsigned int | |
2405 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2406 | unsigned int r_type, | |
2407 | Relobj* object) | |
2408 | { | |
2409 | switch (r_type) | |
2410 | { | |
2411 | case elfcpp::R_386_NONE: | |
2412 | case elfcpp::R_386_GNU_VTINHERIT: | |
2413 | case elfcpp::R_386_GNU_VTENTRY: | |
2414 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2415 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2416 | case elfcpp::R_386_TLS_DESC_CALL: | |
2417 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2418 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2419 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2420 | case elfcpp::R_386_TLS_IE_32: | |
2421 | case elfcpp::R_386_TLS_GOTIE: | |
2422 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2423 | case elfcpp::R_386_TLS_LE_32: | |
2424 | return 0; | |
2425 | ||
2426 | case elfcpp::R_386_32: | |
2427 | case elfcpp::R_386_PC32: | |
2428 | case elfcpp::R_386_GOT32: | |
2429 | case elfcpp::R_386_PLT32: | |
2430 | case elfcpp::R_386_GOTOFF: | |
2431 | case elfcpp::R_386_GOTPC: | |
2432 | return 4; | |
2433 | ||
2434 | case elfcpp::R_386_16: | |
2435 | case elfcpp::R_386_PC16: | |
2436 | return 2; | |
2437 | ||
2438 | case elfcpp::R_386_8: | |
2439 | case elfcpp::R_386_PC8: | |
2440 | return 1; | |
2441 | ||
2442 | // These are relocations which should only be seen by the | |
2443 | // dynamic linker, and should never be seen here. | |
2444 | case elfcpp::R_386_COPY: | |
2445 | case elfcpp::R_386_GLOB_DAT: | |
2446 | case elfcpp::R_386_JUMP_SLOT: | |
2447 | case elfcpp::R_386_RELATIVE: | |
2448 | case elfcpp::R_386_TLS_TPOFF: | |
2449 | case elfcpp::R_386_TLS_DTPMOD32: | |
2450 | case elfcpp::R_386_TLS_DTPOFF32: | |
2451 | case elfcpp::R_386_TLS_TPOFF32: | |
2452 | case elfcpp::R_386_TLS_DESC: | |
2453 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2454 | return 0; | |
2455 | ||
2456 | case elfcpp::R_386_32PLT: | |
2457 | case elfcpp::R_386_TLS_GD_32: | |
2458 | case elfcpp::R_386_TLS_GD_PUSH: | |
2459 | case elfcpp::R_386_TLS_GD_CALL: | |
2460 | case elfcpp::R_386_TLS_GD_POP: | |
2461 | case elfcpp::R_386_TLS_LDM_32: | |
2462 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2463 | case elfcpp::R_386_TLS_LDM_CALL: | |
2464 | case elfcpp::R_386_TLS_LDM_POP: | |
2465 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2466 | default: | |
2467 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2468 | return 0; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | // Scan the relocs during a relocatable link. | |
2473 | ||
2474 | void | |
2475 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2476 | Symbol_table* symtab, | |
2477 | Layout* layout, | |
2478 | Sized_relobj<32, false>* object, | |
2479 | unsigned int data_shndx, | |
2480 | unsigned int sh_type, | |
2481 | const unsigned char* prelocs, | |
2482 | size_t reloc_count, | |
2483 | Output_section* output_section, | |
2484 | bool needs_special_offset_handling, | |
2485 | size_t local_symbol_count, | |
2486 | const unsigned char* plocal_symbols, | |
2487 | Relocatable_relocs* rr) | |
2488 | { | |
2489 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2490 | ||
2491 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2492 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2493 | ||
7019cd25 | 2494 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2495 | Scan_relocatable_relocs>( |
2496 | options, | |
2497 | symtab, | |
2498 | layout, | |
2499 | object, | |
2500 | data_shndx, | |
2501 | prelocs, | |
2502 | reloc_count, | |
2503 | output_section, | |
2504 | needs_special_offset_handling, | |
2505 | local_symbol_count, | |
2506 | plocal_symbols, | |
2507 | rr); | |
2508 | } | |
2509 | ||
2510 | // Relocate a section during a relocatable link. | |
2511 | ||
2512 | void | |
2513 | Target_i386::relocate_for_relocatable( | |
2514 | const Relocate_info<32, false>* relinfo, | |
2515 | unsigned int sh_type, | |
2516 | const unsigned char* prelocs, | |
2517 | size_t reloc_count, | |
2518 | Output_section* output_section, | |
2519 | off_t offset_in_output_section, | |
2520 | const Relocatable_relocs* rr, | |
2521 | unsigned char* view, | |
2522 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2523 | section_size_type view_size, | |
2524 | unsigned char* reloc_view, | |
2525 | section_size_type reloc_view_size) | |
2526 | { | |
2527 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2528 | ||
7019cd25 | 2529 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2530 | relinfo, |
2531 | prelocs, | |
2532 | reloc_count, | |
2533 | output_section, | |
2534 | offset_in_output_section, | |
2535 | rr, | |
2536 | view, | |
2537 | view_address, | |
2538 | view_size, | |
2539 | reloc_view, | |
2540 | reloc_view_size); | |
2541 | } | |
2542 | ||
ab5c9e90 ILT |
2543 | // Return the value to use for a dynamic which requires special |
2544 | // treatment. This is how we support equality comparisons of function | |
2545 | // pointers across shared library boundaries, as described in the | |
2546 | // processor specific ABI supplement. | |
2547 | ||
2548 | uint64_t | |
2549 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2550 | { | |
2551 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2552 | return this->plt_section()->address() + gsym->plt_offset(); | |
2553 | } | |
2554 | ||
c51e6221 ILT |
2555 | // Return a string used to fill a code section with nops to take up |
2556 | // the specified length. | |
2557 | ||
2558 | std::string | |
8851ecca | 2559 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2560 | { |
2561 | if (length >= 16) | |
2562 | { | |
2563 | // Build a jmp instruction to skip over the bytes. | |
2564 | unsigned char jmp[5]; | |
2565 | jmp[0] = 0xe9; | |
2566 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2567 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2568 | + std::string(length - 5, '\0')); | |
2569 | } | |
2570 | ||
2571 | // Nop sequences of various lengths. | |
2572 | const char nop1[1] = { 0x90 }; // nop | |
2573 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2574 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2575 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2576 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2577 | 0x00 }; // leal 0(%esi,1),%esi | |
2578 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2579 | 0x00, 0x00 }; | |
2580 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2581 | 0x00, 0x00, 0x00 }; | |
2582 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2583 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2584 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2585 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2586 | 0x00 }; | |
2587 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2588 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2589 | 0x00, 0x00 }; | |
2590 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2591 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2592 | 0x00, 0x00, 0x00 }; | |
2593 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2594 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2595 | 0x00, 0x00, 0x00, 0x00 }; | |
2596 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2597 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2598 | 0x27, 0x00, 0x00, 0x00, | |
2599 | 0x00 }; | |
2600 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2601 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2602 | 0xbc, 0x27, 0x00, 0x00, | |
2603 | 0x00, 0x00 }; | |
2604 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2605 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2606 | 0x90, 0x90, 0x90, 0x90, | |
2607 | 0x90, 0x90, 0x90 }; | |
2608 | ||
2609 | const char* nops[16] = { | |
2610 | NULL, | |
2611 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2612 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2613 | }; | |
2614 | ||
2615 | return std::string(nops[length], length); | |
2616 | } | |
2617 | ||
14bfc3f5 ILT |
2618 | // The selector for i386 object files. |
2619 | ||
2620 | class Target_selector_i386 : public Target_selector | |
2621 | { | |
2622 | public: | |
2623 | Target_selector_i386() | |
e96caa79 | 2624 | : Target_selector(elfcpp::EM_386, 32, false, "elf32-i386") |
14bfc3f5 ILT |
2625 | { } |
2626 | ||
2627 | Target* | |
e96caa79 ILT |
2628 | do_instantiate_target() |
2629 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2630 | }; |
2631 | ||
14bfc3f5 ILT |
2632 | Target_selector_i386 target_selector_i386; |
2633 | ||
2634 | } // End anonymous namespace. |