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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" | |
12c0daef | 35 | #include "copy-relocs.h" |
14bfc3f5 | 36 | #include "target.h" |
61ba1cf9 | 37 | #include "target-reloc.h" |
14bfc3f5 | 38 | #include "target-select.h" |
af6359d5 | 39 | #include "tls.h" |
14bfc3f5 ILT |
40 | |
41 | namespace | |
42 | { | |
43 | ||
44 | using namespace gold; | |
45 | ||
a3ad94ed ILT |
46 | class Output_data_plt_i386; |
47 | ||
14bfc3f5 | 48 | // The i386 target class. |
e041f13d ILT |
49 | // TLS info comes from |
50 | // http://people.redhat.com/drepper/tls.pdf | |
51 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 ILT |
52 | |
53 | class Target_i386 : public Sized_target<32, false> | |
54 | { | |
55 | public: | |
5a6f7e2d ILT |
56 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
57 | ||
14bfc3f5 | 58 | Target_i386() |
ead1e424 | 59 | : Sized_target<32, false>(&i386_info), |
5a6f7e2d | 60 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
12c0daef | 61 | copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), |
edfbb029 | 62 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 63 | { } |
75f65a3e | 64 | |
92e059d8 | 65 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 66 | void |
92e059d8 ILT |
67 | scan_relocs(const General_options& options, |
68 | Symbol_table* symtab, | |
ead1e424 | 69 | Layout* layout, |
f6ce93d6 | 70 | Sized_relobj<32, false>* object, |
a3ad94ed | 71 | unsigned int data_shndx, |
92e059d8 ILT |
72 | unsigned int sh_type, |
73 | const unsigned char* prelocs, | |
74 | size_t reloc_count, | |
730cdc88 ILT |
75 | Output_section* output_section, |
76 | bool needs_special_offset_handling, | |
92e059d8 | 77 | size_t local_symbol_count, |
730cdc88 | 78 | const unsigned char* plocal_symbols); |
61ba1cf9 | 79 | |
5a6f7e2d ILT |
80 | // Finalize the sections. |
81 | void | |
7e1edb90 | 82 | do_finalize_sections(Layout*); |
5a6f7e2d | 83 | |
ab5c9e90 ILT |
84 | // Return the value to use for a dynamic which requires special |
85 | // treatment. | |
86 | uint64_t | |
87 | do_dynsym_value(const Symbol*) const; | |
88 | ||
92e059d8 ILT |
89 | // Relocate a section. |
90 | void | |
91 | relocate_section(const Relocate_info<32, false>*, | |
92 | unsigned int sh_type, | |
93 | const unsigned char* prelocs, | |
94 | size_t reloc_count, | |
730cdc88 ILT |
95 | Output_section* output_section, |
96 | bool needs_special_offset_handling, | |
92e059d8 ILT |
97 | unsigned char* view, |
98 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
fe8718a4 | 99 | section_size_type view_size); |
92e059d8 | 100 | |
6a74a719 ILT |
101 | // Scan the relocs during a relocatable link. |
102 | void | |
103 | scan_relocatable_relocs(const General_options& options, | |
104 | Symbol_table* symtab, | |
105 | Layout* layout, | |
106 | Sized_relobj<32, false>* object, | |
107 | unsigned int data_shndx, | |
108 | unsigned int sh_type, | |
109 | const unsigned char* prelocs, | |
110 | size_t reloc_count, | |
111 | Output_section* output_section, | |
112 | bool needs_special_offset_handling, | |
113 | size_t local_symbol_count, | |
114 | const unsigned char* plocal_symbols, | |
115 | Relocatable_relocs*); | |
116 | ||
117 | // Relocate a section during a relocatable link. | |
118 | void | |
119 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
120 | unsigned int sh_type, | |
121 | const unsigned char* prelocs, | |
122 | size_t reloc_count, | |
123 | Output_section* output_section, | |
124 | off_t offset_in_output_section, | |
125 | const Relocatable_relocs*, | |
126 | unsigned char* view, | |
127 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
128 | section_size_type view_size, | |
129 | unsigned char* reloc_view, | |
130 | section_size_type reloc_view_size); | |
131 | ||
c51e6221 ILT |
132 | // Return a string used to fill a code section with nops. |
133 | std::string | |
8851ecca | 134 | do_code_fill(section_size_type length) const; |
c51e6221 | 135 | |
9a2d6984 ILT |
136 | // Return whether SYM is defined by the ABI. |
137 | bool | |
138 | do_is_defined_by_abi(Symbol* sym) const | |
139 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } | |
140 | ||
96f2030e | 141 | // Return the size of the GOT section. |
fe8718a4 | 142 | section_size_type |
96f2030e ILT |
143 | got_size() |
144 | { | |
145 | gold_assert(this->got_ != NULL); | |
146 | return this->got_->data_size(); | |
147 | } | |
148 | ||
92e059d8 ILT |
149 | private: |
150 | // The class which scans relocations. | |
151 | struct Scan | |
61ba1cf9 ILT |
152 | { |
153 | inline void | |
ead1e424 ILT |
154 | local(const General_options& options, Symbol_table* symtab, |
155 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 156 | Sized_relobj<32, false>* object, |
a3ad94ed | 157 | unsigned int data_shndx, |
07f397ab | 158 | Output_section* output_section, |
92e059d8 ILT |
159 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
160 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 161 | |
92e059d8 | 162 | inline void |
ead1e424 ILT |
163 | global(const General_options& options, Symbol_table* symtab, |
164 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 165 | Sized_relobj<32, false>* object, |
a3ad94ed | 166 | unsigned int data_shndx, |
07f397ab | 167 | Output_section* output_section, |
92e059d8 ILT |
168 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
169 | Symbol* gsym); | |
af6359d5 ILT |
170 | |
171 | static void | |
172 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
173 | ||
174 | static void | |
175 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
176 | Symbol*); | |
61ba1cf9 ILT |
177 | }; |
178 | ||
92e059d8 ILT |
179 | // The class which implements relocation. |
180 | class Relocate | |
181 | { | |
182 | public: | |
ead1e424 | 183 | Relocate() |
46cf9fa2 ILT |
184 | : skip_call_tls_get_addr_(false), |
185 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
186 | { } |
187 | ||
188 | ~Relocate() | |
189 | { | |
190 | if (this->skip_call_tls_get_addr_) | |
191 | { | |
192 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 193 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
194 | } |
195 | } | |
196 | ||
86849f1f ILT |
197 | // Return whether the static relocation needs to be applied. |
198 | inline bool | |
199 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 200 | int ref_flags, |
86849f1f ILT |
201 | bool is_32bit); |
202 | ||
ead1e424 ILT |
203 | // Do a relocation. Return false if the caller should not issue |
204 | // any warnings about this relocation. | |
205 | inline bool | |
206 | relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum, | |
92e059d8 | 207 | const elfcpp::Rel<32, false>&, |
c06b7b0b | 208 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 209 | const Symbol_value<32>*, |
92e059d8 | 210 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 211 | section_size_type); |
92e059d8 ILT |
212 | |
213 | private: | |
214 | // Do a TLS relocation. | |
ead1e424 | 215 | inline void |
07f397ab ILT |
216 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
217 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 218 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 219 | const Symbol_value<32>*, |
fe8718a4 ILT |
220 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
221 | section_size_type); | |
92e059d8 | 222 | |
07f397ab ILT |
223 | // Do a TLS General-Dynamic to Initial-Exec transition. |
224 | inline void | |
225 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
226 | Output_segment* tls_segment, | |
227 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
228 | elfcpp::Elf_types<32>::Elf_Addr value, | |
229 | unsigned char* view, | |
fe8718a4 | 230 | section_size_type view_size); |
07f397ab | 231 | |
56622147 ILT |
232 | // Do a TLS General-Dynamic to Local-Exec transition. |
233 | inline void | |
234 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
235 | Output_segment* tls_segment, |
236 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
237 | elfcpp::Elf_types<32>::Elf_Addr value, | |
238 | unsigned char* view, | |
fe8718a4 | 239 | section_size_type view_size); |
92e059d8 | 240 | |
c2b45e22 CC |
241 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
242 | // transition. | |
243 | inline void | |
244 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
245 | Output_segment* tls_segment, | |
246 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
247 | elfcpp::Elf_types<32>::Elf_Addr value, | |
248 | unsigned char* view, | |
249 | section_size_type view_size); | |
250 | ||
251 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
252 | // transition. | |
253 | inline void | |
254 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
255 | Output_segment* tls_segment, | |
256 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
257 | elfcpp::Elf_types<32>::Elf_Addr value, | |
258 | unsigned char* view, | |
259 | section_size_type view_size); | |
260 | ||
56622147 | 261 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 262 | inline void |
56622147 | 263 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
264 | Output_segment* tls_segment, |
265 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
266 | elfcpp::Elf_types<32>::Elf_Addr value, | |
267 | unsigned char* view, | |
fe8718a4 | 268 | section_size_type view_size); |
ead1e424 | 269 | |
56622147 ILT |
270 | // Do a TLS Initial-Exec to Local-Exec transition. |
271 | static inline void | |
272 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
273 | Output_segment* tls_segment, |
274 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
275 | elfcpp::Elf_types<32>::Elf_Addr value, | |
276 | unsigned char* view, | |
fe8718a4 | 277 | section_size_type view_size); |
46cf9fa2 | 278 | |
46cf9fa2 ILT |
279 | // We need to keep track of which type of local dynamic relocation |
280 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
281 | enum Local_dynamic_type | |
282 | { | |
283 | LOCAL_DYNAMIC_NONE, | |
284 | LOCAL_DYNAMIC_SUN, | |
285 | LOCAL_DYNAMIC_GNU | |
286 | }; | |
287 | ||
ead1e424 ILT |
288 | // This is set if we should skip the next reloc, which should be a |
289 | // PLT32 reloc against ___tls_get_addr. | |
290 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
291 | // The type of local dynamic relocation we have seen in the section |
292 | // being relocated, if any. | |
293 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
294 | }; |
295 | ||
6a74a719 ILT |
296 | // A class which returns the size required for a relocation type, |
297 | // used while scanning relocs during a relocatable link. | |
298 | class Relocatable_size_for_reloc | |
299 | { | |
300 | public: | |
301 | unsigned int | |
302 | get_size_for_reloc(unsigned int, Relobj*); | |
303 | }; | |
304 | ||
92e059d8 ILT |
305 | // Adjust TLS relocation type based on the options and whether this |
306 | // is a local symbol. | |
af6359d5 | 307 | static tls::Tls_optimization |
7e1edb90 | 308 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 309 | |
ead1e424 | 310 | // Get the GOT section, creating it if necessary. |
dbe717ef | 311 | Output_data_got<32, false>* |
7e1edb90 | 312 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 313 | |
96f2030e ILT |
314 | // Get the GOT PLT section. |
315 | Output_data_space* | |
316 | got_plt_section() const | |
317 | { | |
318 | gold_assert(this->got_plt_ != NULL); | |
319 | return this->got_plt_; | |
320 | } | |
321 | ||
a3ad94ed ILT |
322 | // Create a PLT entry for a global symbol. |
323 | void | |
7e1edb90 | 324 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 325 | |
edfbb029 CC |
326 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
327 | void | |
328 | define_tls_base_symbol(Symbol_table*, Layout*); | |
329 | ||
94c4710f ILT |
330 | // Create a GOT entry for the TLS module index. |
331 | unsigned int | |
332 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
333 | Sized_relobj<32, false>* object); | |
334 | ||
a3ad94ed | 335 | // Get the PLT section. |
7bb3655e | 336 | const Output_data_plt_i386* |
a3ad94ed ILT |
337 | plt_section() const |
338 | { | |
339 | gold_assert(this->plt_ != NULL); | |
340 | return this->plt_; | |
341 | } | |
342 | ||
5a6f7e2d ILT |
343 | // Get the dynamic reloc section, creating it if necessary. |
344 | Reloc_section* | |
345 | rel_dyn_section(Layout*); | |
346 | ||
d61c6bd4 ILT |
347 | // Return true if the symbol may need a COPY relocation. |
348 | // References from an executable object to non-function symbols | |
349 | // defined in a dynamic object may need a COPY relocation. | |
350 | bool | |
351 | may_need_copy_reloc(Symbol* gsym) | |
352 | { | |
8851ecca | 353 | return (!parameters->options().shared() |
d61c6bd4 ILT |
354 | && gsym->is_from_dynobj() |
355 | && gsym->type() != elfcpp::STT_FUNC); | |
356 | } | |
357 | ||
12c0daef | 358 | // Add a potential copy relocation. |
a3ad94ed | 359 | void |
12c0daef ILT |
360 | copy_reloc(Symbol_table* symtab, Layout* layout, Relobj* object, |
361 | unsigned int shndx, Output_section* output_section, | |
362 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
363 | { | |
364 | this->copy_relocs_.copy_reloc(symtab, layout, | |
365 | symtab->get_sized_symbol<32>(sym), | |
366 | object, shndx, output_section, reloc, | |
367 | this->rel_dyn_section(layout)); | |
368 | } | |
ead1e424 | 369 | |
92e059d8 ILT |
370 | // Information about this specific target which we pass to the |
371 | // general Target structure. | |
75f65a3e | 372 | static const Target::Target_info i386_info; |
ead1e424 | 373 | |
0a65a3a7 CC |
374 | // The types of GOT entries needed for this platform. |
375 | enum Got_type | |
376 | { | |
377 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
378 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
379 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
380 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
381 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
382 | }; |
383 | ||
ead1e424 | 384 | // The GOT section. |
dbe717ef | 385 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
386 | // The PLT section. |
387 | Output_data_plt_i386* plt_; | |
388 | // The GOT PLT section. | |
389 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
390 | // The dynamic reloc section. |
391 | Reloc_section* rel_dyn_; | |
392 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 393 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
394 | // Space for variables copied with a COPY reloc. |
395 | Output_data_space* dynbss_; | |
c2b45e22 | 396 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 397 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
398 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
399 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
400 | }; |
401 | ||
402 | const Target::Target_info Target_i386::i386_info = | |
403 | { | |
61ba1cf9 ILT |
404 | 32, // size |
405 | false, // is_big_endian | |
406 | elfcpp::EM_386, // machine_code | |
407 | false, // has_make_symbol | |
dbe717ef | 408 | false, // has_resolve |
c51e6221 | 409 | true, // has_code_fill |
35cdfc9a | 410 | true, // is_default_stack_executable |
0864d551 | 411 | '\0', // wrap_char |
dbe717ef | 412 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 413 | 0x08048000, // default_text_segment_address |
cd72c291 ILT |
414 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
415 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
14bfc3f5 ILT |
416 | }; |
417 | ||
ead1e424 ILT |
418 | // Get the GOT section, creating it if necessary. |
419 | ||
dbe717ef | 420 | Output_data_got<32, false>* |
7e1edb90 | 421 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
422 | { |
423 | if (this->got_ == NULL) | |
424 | { | |
7e1edb90 | 425 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 426 | |
7e1edb90 | 427 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 428 | |
ead1e424 | 429 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
16649710 ILT |
430 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
431 | this->got_); | |
ead1e424 | 432 | |
a3ad94ed ILT |
433 | // The old GNU linker creates a .got.plt section. We just |
434 | // create another set of data in the .got section. Note that we | |
435 | // always create a PLT if we create a GOT, although the PLT | |
436 | // might be empty. | |
437 | this->got_plt_ = new Output_data_space(4); | |
438 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
16649710 ILT |
439 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
440 | this->got_plt_); | |
a3ad94ed | 441 | |
ead1e424 | 442 | // The first three entries are reserved. |
27bc2bce | 443 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 444 | |
a3ad94ed | 445 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 446 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 447 | this->got_plt_, |
ead1e424 | 448 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 449 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
450 | elfcpp::STV_HIDDEN, 0, |
451 | false, false); | |
452 | } | |
a3ad94ed | 453 | |
ead1e424 ILT |
454 | return this->got_; |
455 | } | |
456 | ||
5a6f7e2d ILT |
457 | // Get the dynamic reloc section, creating it if necessary. |
458 | ||
459 | Target_i386::Reloc_section* | |
460 | Target_i386::rel_dyn_section(Layout* layout) | |
461 | { | |
462 | if (this->rel_dyn_ == NULL) | |
463 | { | |
464 | gold_assert(layout != NULL); | |
465 | this->rel_dyn_ = new Reloc_section(); | |
466 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
467 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
468 | } | |
469 | return this->rel_dyn_; | |
470 | } | |
471 | ||
a3ad94ed ILT |
472 | // A class to handle the PLT data. |
473 | ||
474 | class Output_data_plt_i386 : public Output_section_data | |
475 | { | |
476 | public: | |
477 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
478 | ||
7e1edb90 | 479 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
480 | |
481 | // Add an entry to the PLT. | |
482 | void | |
483 | add_entry(Symbol* gsym); | |
484 | ||
16649710 ILT |
485 | // Return the .rel.plt section data. |
486 | const Reloc_section* | |
487 | rel_plt() const | |
488 | { return this->rel_; } | |
489 | ||
490 | protected: | |
491 | void | |
492 | do_adjust_output_section(Output_section* os); | |
493 | ||
a3ad94ed ILT |
494 | private: |
495 | // The size of an entry in the PLT. | |
496 | static const int plt_entry_size = 16; | |
497 | ||
498 | // The first entry in the PLT for an executable. | |
499 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
500 | ||
501 | // The first entry in the PLT for a shared object. | |
502 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
503 | ||
504 | // Other entries in the PLT for an executable. | |
505 | static unsigned char exec_plt_entry[plt_entry_size]; | |
506 | ||
507 | // Other entries in the PLT for a shared object. | |
508 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
509 | ||
510 | // Set the final size. | |
511 | void | |
27bc2bce | 512 | set_final_data_size() |
a3ad94ed ILT |
513 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
514 | ||
515 | // Write out the PLT data. | |
516 | void | |
517 | do_write(Output_file*); | |
518 | ||
519 | // The reloc section. | |
520 | Reloc_section* rel_; | |
521 | // The .got.plt section. | |
522 | Output_data_space* got_plt_; | |
523 | // The number of PLT entries. | |
524 | unsigned int count_; | |
a3ad94ed ILT |
525 | }; |
526 | ||
527 | // Create the PLT section. The ordinary .got section is an argument, | |
528 | // since we need to refer to the start. We also create our own .got | |
529 | // section just for PLT entries. | |
530 | ||
531 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 532 | Output_data_space* got_plt) |
80576242 | 533 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed ILT |
534 | { |
535 | this->rel_ = new Reloc_section(); | |
536 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
537 | elfcpp::SHF_ALLOC, this->rel_); | |
538 | } | |
539 | ||
16649710 ILT |
540 | void |
541 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
542 | { | |
543 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
544 | // linker, and so do we. | |
545 | os->set_entsize(4); | |
546 | } | |
547 | ||
a3ad94ed ILT |
548 | // Add an entry to the PLT. |
549 | ||
550 | void | |
551 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
552 | { | |
553 | gold_assert(!gsym->has_plt_offset()); | |
554 | ||
555 | // Note that when setting the PLT offset we skip the initial | |
556 | // reserved PLT entry. | |
557 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
558 | ||
559 | ++this->count_; | |
560 | ||
fe8718a4 | 561 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
562 | |
563 | // Every PLT entry needs a GOT entry which points back to the PLT | |
564 | // entry (this will be changed by the dynamic linker, normally | |
565 | // lazily when the function is called). | |
27bc2bce | 566 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
567 | |
568 | // Every PLT entry needs a reloc. | |
16649710 | 569 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
570 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
571 | got_offset); | |
572 | ||
573 | // Note that we don't need to save the symbol. The contents of the | |
574 | // PLT are independent of which symbols are used. The symbols only | |
575 | // appear in the relocations. | |
576 | } | |
577 | ||
578 | // The first entry in the PLT for an executable. | |
579 | ||
580 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
581 | { | |
582 | 0xff, 0x35, // pushl contents of memory address | |
583 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
584 | 0xff, 0x25, // jmp indirect | |
585 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
586 | 0, 0, 0, 0 // unused | |
587 | }; | |
588 | ||
589 | // The first entry in the PLT for a shared object. | |
590 | ||
591 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
592 | { | |
593 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
594 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
595 | 0, 0, 0, 0 // unused | |
596 | }; | |
597 | ||
598 | // Subsequent entries in the PLT for an executable. | |
599 | ||
600 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
601 | { | |
602 | 0xff, 0x25, // jmp indirect | |
603 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
604 | 0x68, // pushl immediate | |
605 | 0, 0, 0, 0, // replaced with offset into relocation table | |
606 | 0xe9, // jmp relative | |
607 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
608 | }; | |
609 | ||
610 | // Subsequent entries in the PLT for a shared object. | |
611 | ||
612 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
613 | { | |
614 | 0xff, 0xa3, // jmp *offset(%ebx) | |
615 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
616 | 0x68, // pushl immediate | |
617 | 0, 0, 0, 0, // replaced with offset into relocation table | |
618 | 0xe9, // jmp relative | |
619 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
620 | }; | |
621 | ||
622 | // Write out the PLT. This uses the hand-coded instructions above, | |
623 | // and adjusts them as needed. This is all specified by the i386 ELF | |
624 | // Processor Supplement. | |
625 | ||
626 | void | |
627 | Output_data_plt_i386::do_write(Output_file* of) | |
628 | { | |
629 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
630 | const section_size_type oview_size = |
631 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
632 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
633 | ||
634 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
635 | const section_size_type got_size = |
636 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
637 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
638 | got_size); | |
639 | ||
640 | unsigned char* pov = oview; | |
641 | ||
642 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
643 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
644 | ||
8851ecca | 645 | if (parameters->options().shared()) |
a3ad94ed ILT |
646 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
647 | else | |
648 | { | |
649 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
650 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
651 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
652 | } | |
653 | pov += plt_entry_size; | |
654 | ||
655 | unsigned char* got_pov = got_view; | |
656 | ||
657 | memset(got_pov, 0, 12); | |
658 | got_pov += 12; | |
659 | ||
660 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
661 | ||
662 | unsigned int plt_offset = plt_entry_size; | |
663 | unsigned int plt_rel_offset = 0; | |
664 | unsigned int got_offset = 12; | |
665 | const unsigned int count = this->count_; | |
666 | for (unsigned int i = 0; | |
667 | i < count; | |
668 | ++i, | |
669 | pov += plt_entry_size, | |
670 | got_pov += 4, | |
671 | plt_offset += plt_entry_size, | |
672 | plt_rel_offset += rel_size, | |
673 | got_offset += 4) | |
674 | { | |
675 | // Set and adjust the PLT entry itself. | |
676 | ||
8851ecca | 677 | if (parameters->options().shared()) |
a3ad94ed ILT |
678 | { |
679 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
680 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
681 | } | |
682 | else | |
683 | { | |
684 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
685 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
686 | (got_address | |
687 | + got_offset)); | |
688 | } | |
689 | ||
690 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
691 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
692 | - (plt_offset + plt_entry_size)); | |
693 | ||
694 | // Set the entry in the GOT. | |
695 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
696 | } | |
697 | ||
fe8718a4 ILT |
698 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
699 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
700 | |
701 | of->write_output_view(offset, oview_size, oview); | |
702 | of->write_output_view(got_file_offset, got_size, got_view); | |
703 | } | |
704 | ||
705 | // Create a PLT entry for a global symbol. | |
706 | ||
707 | void | |
7e1edb90 | 708 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
709 | { |
710 | if (gsym->has_plt_offset()) | |
711 | return; | |
712 | ||
713 | if (this->plt_ == NULL) | |
714 | { | |
715 | // Create the GOT sections first. | |
7e1edb90 | 716 | this->got_section(symtab, layout); |
a3ad94ed | 717 | |
7e1edb90 | 718 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
719 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
720 | (elfcpp::SHF_ALLOC | |
721 | | elfcpp::SHF_EXECINSTR), | |
722 | this->plt_); | |
a3ad94ed ILT |
723 | } |
724 | ||
725 | this->plt_->add_entry(gsym); | |
726 | } | |
727 | ||
edfbb029 CC |
728 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
729 | ||
730 | void | |
731 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
732 | { | |
733 | if (this->tls_base_symbol_defined_) | |
734 | return; | |
735 | ||
736 | Output_segment* tls_segment = layout->tls_segment(); | |
737 | if (tls_segment != NULL) | |
738 | { | |
739 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, | |
740 | tls_segment, 0, 0, | |
741 | elfcpp::STT_TLS, | |
742 | elfcpp::STB_LOCAL, | |
743 | elfcpp::STV_HIDDEN, 0, | |
744 | Symbol::SEGMENT_END, true); | |
745 | } | |
746 | this->tls_base_symbol_defined_ = true; | |
747 | } | |
748 | ||
94c4710f ILT |
749 | // Create a GOT entry for the TLS module index. |
750 | ||
751 | unsigned int | |
752 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
753 | Sized_relobj<32, false>* object) | |
754 | { | |
755 | if (this->got_mod_index_offset_ == -1U) | |
756 | { | |
757 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
758 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
759 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
760 | unsigned int got_offset = got->add_constant(0); | |
761 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
762 | got_offset); | |
009a67a2 | 763 | got->add_constant(0); |
94c4710f ILT |
764 | this->got_mod_index_offset_ = got_offset; |
765 | } | |
766 | return this->got_mod_index_offset_; | |
767 | } | |
768 | ||
92e059d8 | 769 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
770 | // symbol. IS_FINAL is true if the final address of this symbol is |
771 | // known at link time. | |
92e059d8 | 772 | |
af6359d5 | 773 | tls::Tls_optimization |
7e1edb90 | 774 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
775 | { |
776 | // If we are generating a shared library, then we can't do anything | |
777 | // in the linker. | |
8851ecca | 778 | if (parameters->options().shared()) |
af6359d5 | 779 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
780 | |
781 | switch (r_type) | |
782 | { | |
783 | case elfcpp::R_386_TLS_GD: | |
784 | case elfcpp::R_386_TLS_GOTDESC: | |
785 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 786 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
787 | // access. Since we know that we are generating an executable, |
788 | // we can convert this to Initial-Exec. If we also know that | |
789 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 790 | if (is_final) |
af6359d5 ILT |
791 | return tls::TLSOPT_TO_LE; |
792 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
793 | |
794 | case elfcpp::R_386_TLS_LDM: | |
795 | // This is Local-Dynamic, which refers to a local symbol in the | |
796 | // dynamic TLS block. Since we know that we generating an | |
797 | // executable, we can switch to Local-Exec. | |
af6359d5 | 798 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
799 | |
800 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
801 | // Another type of Local-Dynamic relocation. |
802 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
803 | |
804 | case elfcpp::R_386_TLS_IE: | |
805 | case elfcpp::R_386_TLS_GOTIE: | |
806 | case elfcpp::R_386_TLS_IE_32: | |
807 | // These are Initial-Exec relocs which get the thread offset | |
808 | // from the GOT. If we know that we are linking against the | |
809 | // local symbol, we can switch to Local-Exec, which links the | |
810 | // thread offset into the instruction. | |
a3ad94ed | 811 | if (is_final) |
af6359d5 ILT |
812 | return tls::TLSOPT_TO_LE; |
813 | return tls::TLSOPT_NONE; | |
8462ae85 | 814 | |
92e059d8 ILT |
815 | case elfcpp::R_386_TLS_LE: |
816 | case elfcpp::R_386_TLS_LE_32: | |
817 | // When we already have Local-Exec, there is nothing further we | |
818 | // can do. | |
af6359d5 | 819 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
820 | |
821 | default: | |
a3ad94ed | 822 | gold_unreachable(); |
92e059d8 ILT |
823 | } |
824 | } | |
825 | ||
af6359d5 ILT |
826 | // Report an unsupported relocation against a local symbol. |
827 | ||
828 | void | |
829 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
830 | unsigned int r_type) | |
831 | { | |
75f2446e ILT |
832 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
833 | object->name().c_str(), r_type); | |
af6359d5 ILT |
834 | } |
835 | ||
92e059d8 ILT |
836 | // Scan a relocation for a local symbol. |
837 | ||
838 | inline void | |
7e1edb90 | 839 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
840 | Symbol_table* symtab, |
841 | Layout* layout, | |
842 | Target_i386* target, | |
f6ce93d6 | 843 | Sized_relobj<32, false>* object, |
1b64748b | 844 | unsigned int data_shndx, |
07f397ab | 845 | Output_section* output_section, |
1b64748b | 846 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 847 | unsigned int r_type, |
7bf1f802 | 848 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
849 | { |
850 | switch (r_type) | |
851 | { | |
852 | case elfcpp::R_386_NONE: | |
853 | case elfcpp::R_386_GNU_VTINHERIT: | |
854 | case elfcpp::R_386_GNU_VTENTRY: | |
855 | break; | |
856 | ||
857 | case elfcpp::R_386_32: | |
436ca963 ILT |
858 | // If building a shared library (or a position-independent |
859 | // executable), we need to create a dynamic relocation for | |
860 | // this location. The relocation applied at link time will | |
861 | // apply the link-time value, so we flag the location with | |
862 | // an R_386_RELATIVE relocation so the dynamic loader can | |
863 | // relocate it easily. | |
8851ecca | 864 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
865 | { |
866 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
867 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
868 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
869 | output_section, data_shndx, | |
870 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
871 | } |
872 | break; | |
873 | ||
874 | case elfcpp::R_386_16: | |
875 | case elfcpp::R_386_8: | |
876 | // If building a shared library (or a position-independent | |
877 | // executable), we need to create a dynamic relocation for | |
878 | // this location. Because the addend needs to remain in the | |
879 | // data section, we need to be careful not to apply this | |
880 | // relocation statically. | |
8851ecca | 881 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
882 | { |
883 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
dceae3c1 ILT |
884 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
885 | { | |
886 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
887 | rel_dyn->add_local(object, r_sym, r_type, output_section, | |
888 | data_shndx, reloc.get_r_offset()); | |
889 | } | |
890 | else | |
891 | { | |
892 | gold_assert(lsym.get_st_value() == 0); | |
893 | rel_dyn->add_local_section(object, lsym.get_st_shndx(), | |
894 | r_type, output_section, | |
895 | data_shndx, reloc.get_r_offset()); | |
896 | } | |
436ca963 | 897 | } |
92e059d8 ILT |
898 | break; |
899 | ||
900 | case elfcpp::R_386_PC32: | |
901 | case elfcpp::R_386_PC16: | |
902 | case elfcpp::R_386_PC8: | |
903 | break; | |
904 | ||
df2efe71 ILT |
905 | case elfcpp::R_386_PLT32: |
906 | // Since we know this is a local symbol, we can handle this as a | |
907 | // PC32 reloc. | |
908 | break; | |
909 | ||
ead1e424 ILT |
910 | case elfcpp::R_386_GOTOFF: |
911 | case elfcpp::R_386_GOTPC: | |
912 | // We need a GOT section. | |
7e1edb90 | 913 | target->got_section(symtab, layout); |
ead1e424 ILT |
914 | break; |
915 | ||
1b64748b ILT |
916 | case elfcpp::R_386_GOT32: |
917 | { | |
918 | // The symbol requires a GOT entry. | |
919 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
920 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 921 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
922 | { |
923 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 924 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 925 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
926 | { |
927 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 928 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
929 | rel_dyn->add_local_relative( |
930 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
931 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
932 | } |
933 | } | |
934 | } | |
935 | break; | |
936 | ||
af6359d5 ILT |
937 | // These are relocations which should only be seen by the |
938 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
939 | case elfcpp::R_386_COPY: |
940 | case elfcpp::R_386_GLOB_DAT: | |
941 | case elfcpp::R_386_JUMP_SLOT: | |
942 | case elfcpp::R_386_RELATIVE: | |
943 | case elfcpp::R_386_TLS_TPOFF: | |
944 | case elfcpp::R_386_TLS_DTPMOD32: | |
945 | case elfcpp::R_386_TLS_DTPOFF32: | |
946 | case elfcpp::R_386_TLS_TPOFF32: | |
947 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 948 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 949 | object->name().c_str(), r_type); |
92e059d8 ILT |
950 | break; |
951 | ||
af6359d5 | 952 | // These are initial TLS relocs, which are expected when |
d61c17ea | 953 | // linking. |
56622147 ILT |
954 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
955 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
956 | case elfcpp::R_386_TLS_DESC_CALL: | |
957 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
958 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
959 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 960 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
961 | case elfcpp::R_386_TLS_GOTIE: |
962 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 963 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 964 | { |
8851ecca | 965 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
966 | const tls::Tls_optimization optimized_type |
967 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
968 | switch (r_type) |
969 | { | |
56622147 | 970 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
971 | if (optimized_type == tls::TLSOPT_NONE) |
972 | { | |
973 | // Create a pair of GOT entries for the module index and | |
974 | // dtv-relative offset. | |
975 | Output_data_got<32, false>* got | |
976 | = target->got_section(symtab, layout); | |
977 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 CC |
978 | got->add_local_pair_with_rel(object, r_sym, |
979 | lsym.get_st_shndx(), | |
980 | GOT_TYPE_TLS_PAIR, | |
981 | target->rel_dyn_section(layout), | |
982 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
983 | } |
984 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
985 | unsupported_reloc_local(object, r_type); | |
986 | break; | |
987 | ||
56622147 | 988 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 989 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
990 | if (optimized_type == tls::TLSOPT_NONE) |
991 | { | |
992 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
993 | Output_data_got<32, false>* got | |
994 | = target->got_section(symtab, layout); | |
995 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
996 | got->add_local_pair_with_rel(object, r_sym, | |
997 | lsym.get_st_shndx(), | |
998 | GOT_TYPE_TLS_DESC, | |
999 | target->rel_dyn_section(layout), | |
1000 | elfcpp::R_386_TLS_DESC, 0); | |
1001 | } | |
1002 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1003 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1004 | break; |
1005 | ||
c2b45e22 CC |
1006 | case elfcpp::R_386_TLS_DESC_CALL: |
1007 | break; | |
1008 | ||
56622147 | 1009 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1010 | if (optimized_type == tls::TLSOPT_NONE) |
1011 | { | |
1012 | // Create a GOT entry for the module index. | |
94c4710f | 1013 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1014 | } |
1015 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1016 | unsupported_reloc_local(object, r_type); |
1017 | break; | |
1018 | ||
56622147 | 1019 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1020 | break; |
1021 | ||
56622147 ILT |
1022 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1023 | case elfcpp::R_386_TLS_IE_32: | |
1024 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1025 | layout->set_has_static_tls(); |
07f397ab ILT |
1026 | if (optimized_type == tls::TLSOPT_NONE) |
1027 | { | |
7bf1f802 ILT |
1028 | // For the R_386_TLS_IE relocation, we need to create a |
1029 | // dynamic relocation when building a shared library. | |
1030 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1031 | && parameters->options().shared()) |
7bf1f802 ILT |
1032 | { |
1033 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1034 | unsigned int r_sym |
1035 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1036 | rel_dyn->add_local_relative(object, r_sym, | |
1037 | elfcpp::R_386_RELATIVE, | |
1038 | output_section, data_shndx, | |
1039 | reloc.get_r_offset()); | |
7bf1f802 | 1040 | } |
07f397ab ILT |
1041 | // Create a GOT entry for the tp-relative offset. |
1042 | Output_data_got<32, false>* got | |
1043 | = target->got_section(symtab, layout); | |
1044 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1045 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1046 | ? elfcpp::R_386_TLS_TPOFF32 | |
1047 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1048 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1049 | ? GOT_TYPE_TLS_OFFSET | |
1050 | : GOT_TYPE_TLS_NOFFSET); | |
1051 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1052 | target->rel_dyn_section(layout), |
1053 | dyn_r_type); | |
07f397ab ILT |
1054 | } |
1055 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1056 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1057 | break; |
af6359d5 | 1058 | |
56622147 ILT |
1059 | case elfcpp::R_386_TLS_LE: // Local-exec |
1060 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1061 | layout->set_has_static_tls(); |
07f397ab | 1062 | if (output_is_shared) |
7bf1f802 ILT |
1063 | { |
1064 | // We need to create a dynamic relocation. | |
dceae3c1 | 1065 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1066 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1067 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1068 | ? elfcpp::R_386_TLS_TPOFF32 | |
1069 | : elfcpp::R_386_TLS_TPOFF); | |
1070 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1071 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1072 | data_shndx, reloc.get_r_offset()); | |
1073 | } | |
56622147 ILT |
1074 | break; |
1075 | ||
af6359d5 ILT |
1076 | default: |
1077 | gold_unreachable(); | |
7e1edb90 ILT |
1078 | } |
1079 | } | |
92e059d8 ILT |
1080 | break; |
1081 | ||
92e059d8 ILT |
1082 | case elfcpp::R_386_32PLT: |
1083 | case elfcpp::R_386_TLS_GD_32: | |
1084 | case elfcpp::R_386_TLS_GD_PUSH: | |
1085 | case elfcpp::R_386_TLS_GD_CALL: | |
1086 | case elfcpp::R_386_TLS_GD_POP: | |
1087 | case elfcpp::R_386_TLS_LDM_32: | |
1088 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1089 | case elfcpp::R_386_TLS_LDM_CALL: | |
1090 | case elfcpp::R_386_TLS_LDM_POP: | |
1091 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1092 | default: | |
af6359d5 | 1093 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1094 | break; |
1095 | } | |
1096 | } | |
1097 | ||
af6359d5 ILT |
1098 | // Report an unsupported relocation against a global symbol. |
1099 | ||
1100 | void | |
1101 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1102 | unsigned int r_type, | |
1103 | Symbol* gsym) | |
1104 | { | |
75f2446e | 1105 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1106 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1107 | } |
1108 | ||
92e059d8 ILT |
1109 | // Scan a relocation for a global symbol. |
1110 | ||
1111 | inline void | |
12c0daef | 1112 | Target_i386::Scan::global(const General_options&, |
ead1e424 ILT |
1113 | Symbol_table* symtab, |
1114 | Layout* layout, | |
1115 | Target_i386* target, | |
f6ce93d6 | 1116 | Sized_relobj<32, false>* object, |
a3ad94ed | 1117 | unsigned int data_shndx, |
07f397ab | 1118 | Output_section* output_section, |
a3ad94ed ILT |
1119 | const elfcpp::Rel<32, false>& reloc, |
1120 | unsigned int r_type, | |
92e059d8 ILT |
1121 | Symbol* gsym) |
1122 | { | |
1123 | switch (r_type) | |
1124 | { | |
1125 | case elfcpp::R_386_NONE: | |
1126 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1127 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1128 | break; |
1129 | ||
1130 | case elfcpp::R_386_32: | |
92e059d8 | 1131 | case elfcpp::R_386_16: |
92e059d8 | 1132 | case elfcpp::R_386_8: |
96f2030e | 1133 | { |
d61c6bd4 ILT |
1134 | // Make a PLT entry if necessary. |
1135 | if (gsym->needs_plt_entry()) | |
1136 | { | |
1137 | target->make_plt_entry(symtab, layout, gsym); | |
1138 | // Since this is not a PC-relative relocation, we may be | |
1139 | // taking the address of a function. In that case we need to | |
1140 | // set the entry in the dynamic symbol table to the address of | |
1141 | // the PLT entry. | |
8851ecca | 1142 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1143 | gsym->set_needs_dynsym_value(); |
1144 | } | |
1145 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1146 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1147 | { |
1148 | if (target->may_need_copy_reloc(gsym)) | |
1149 | { | |
12c0daef | 1150 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1151 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1152 | } |
1153 | else if (r_type == elfcpp::R_386_32 | |
1154 | && gsym->can_use_relative_reloc(false)) | |
1155 | { | |
1156 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1157 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1158 | output_section, object, | |
1159 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1160 | } |
1161 | else | |
1162 | { | |
96f2030e | 1163 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1164 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1165 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1166 | } |
1167 | } | |
1168 | } | |
1169 | break; | |
1170 | ||
1171 | case elfcpp::R_386_PC32: | |
1172 | case elfcpp::R_386_PC16: | |
1173 | case elfcpp::R_386_PC8: | |
1174 | { | |
1175 | // Make a PLT entry if necessary. | |
1176 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1177 | { |
1178 | // These relocations are used for function calls only in | |
1179 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1180 | // we'll need a text relocation anyway, so we can skip the | |
1181 | // PLT entry and let the dynamic linker bind the call directly | |
1182 | // to the target. For smaller relocations, we should use a | |
1183 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1184 | if (!parameters->options().shared() |
7bf1f802 ILT |
1185 | || r_type != elfcpp::R_386_PC32) |
1186 | target->make_plt_entry(symtab, layout, gsym); | |
1187 | } | |
d61c6bd4 | 1188 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1189 | int flags = Symbol::NON_PIC_REF; |
1190 | if (gsym->type() == elfcpp::STT_FUNC) | |
1191 | flags |= Symbol::FUNCTION_CALL; | |
1192 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1193 | { |
d61c6bd4 ILT |
1194 | if (target->may_need_copy_reloc(gsym)) |
1195 | { | |
12c0daef | 1196 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1197 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1198 | } |
86849f1f | 1199 | else |
d61c6bd4 ILT |
1200 | { |
1201 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1202 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1203 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1204 | } |
96f2030e ILT |
1205 | } |
1206 | } | |
92e059d8 ILT |
1207 | break; |
1208 | ||
ead1e424 | 1209 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1210 | { |
1211 | // The symbol requires a GOT entry. | |
7e1edb90 | 1212 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1213 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1214 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1215 | else |
1216 | { | |
8462ae85 | 1217 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1218 | // GOT entry with a dynamic relocation. |
1219 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1220 | if (gsym->is_from_dynobj() |
1221 | || gsym->is_undefined() | |
1222 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1223 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1224 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1225 | else |
8462ae85 | 1226 | { |
0a65a3a7 CC |
1227 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1228 | rel_dyn->add_global_relative( | |
1229 | gsym, elfcpp::R_386_RELATIVE, got, | |
1230 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1231 | } |
1232 | } | |
1233 | } | |
ead1e424 ILT |
1234 | break; |
1235 | ||
1236 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1237 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1238 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1239 | if (gsym->final_value_is_known()) |
ead1e424 | 1240 | break; |
436ca963 ILT |
1241 | // If building a shared library, we can also skip the PLT entry |
1242 | // if the symbol is defined in the output file and is protected | |
1243 | // or hidden. | |
1244 | if (gsym->is_defined() | |
1245 | && !gsym->is_from_dynobj() | |
1246 | && !gsym->is_preemptible()) | |
1247 | break; | |
7e1edb90 | 1248 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1249 | break; |
1250 | ||
1251 | case elfcpp::R_386_GOTOFF: | |
1252 | case elfcpp::R_386_GOTPC: | |
1253 | // We need a GOT section. | |
7e1edb90 | 1254 | target->got_section(symtab, layout); |
ead1e424 ILT |
1255 | break; |
1256 | ||
af6359d5 ILT |
1257 | // These are relocations which should only be seen by the |
1258 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1259 | case elfcpp::R_386_COPY: |
1260 | case elfcpp::R_386_GLOB_DAT: | |
1261 | case elfcpp::R_386_JUMP_SLOT: | |
1262 | case elfcpp::R_386_RELATIVE: | |
1263 | case elfcpp::R_386_TLS_TPOFF: | |
1264 | case elfcpp::R_386_TLS_DTPMOD32: | |
1265 | case elfcpp::R_386_TLS_DTPOFF32: | |
1266 | case elfcpp::R_386_TLS_TPOFF32: | |
1267 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1268 | gold_error(_("%s: unexpected reloc %u in object file"), |
1269 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1270 | break; |
1271 | ||
d61c17ea ILT |
1272 | // These are initial tls relocs, which are expected when |
1273 | // linking. | |
56622147 ILT |
1274 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1275 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1276 | case elfcpp::R_386_TLS_DESC_CALL: | |
1277 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1278 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1279 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1280 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1281 | case elfcpp::R_386_TLS_GOTIE: |
1282 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1283 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1284 | { |
7e1edb90 | 1285 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1286 | const tls::Tls_optimization optimized_type |
1287 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1288 | switch (r_type) |
1289 | { | |
56622147 | 1290 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1291 | if (optimized_type == tls::TLSOPT_NONE) |
1292 | { | |
1293 | // Create a pair of GOT entries for the module index and | |
1294 | // dtv-relative offset. | |
1295 | Output_data_got<32, false>* got | |
1296 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1297 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1298 | target->rel_dyn_section(layout), |
1299 | elfcpp::R_386_TLS_DTPMOD32, | |
1300 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1301 | } |
1302 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1303 | { | |
1304 | // Create a GOT entry for the tp-relative offset. | |
1305 | Output_data_got<32, false>* got | |
1306 | = target->got_section(symtab, layout); | |
c2b45e22 | 1307 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1308 | target->rel_dyn_section(layout), |
c2b45e22 | 1309 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1310 | } |
1311 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1312 | unsupported_reloc_global(object, r_type, gsym); | |
1313 | break; | |
1314 | ||
56622147 | 1315 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1316 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1317 | if (optimized_type == tls::TLSOPT_NONE) |
1318 | { | |
1319 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1320 | Output_data_got<32, false>* got | |
1321 | = target->got_section(symtab, layout); | |
1322 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1323 | target->rel_dyn_section(layout), | |
1324 | elfcpp::R_386_TLS_DESC, 0); | |
1325 | } | |
1326 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1327 | { | |
1328 | // Create a GOT entry for the tp-relative offset. | |
1329 | Output_data_got<32, false>* got | |
1330 | = target->got_section(symtab, layout); | |
1331 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1332 | target->rel_dyn_section(layout), | |
1333 | elfcpp::R_386_TLS_TPOFF); | |
1334 | } | |
1335 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1336 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1337 | break; |
1338 | ||
1339 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1340 | break; |
1341 | ||
56622147 | 1342 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1343 | if (optimized_type == tls::TLSOPT_NONE) |
1344 | { | |
1345 | // Create a GOT entry for the module index. | |
94c4710f | 1346 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1347 | } |
1348 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1349 | unsupported_reloc_global(object, r_type, gsym); |
1350 | break; | |
1351 | ||
56622147 | 1352 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1353 | break; |
1354 | ||
56622147 ILT |
1355 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1356 | case elfcpp::R_386_TLS_IE_32: | |
1357 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1358 | layout->set_has_static_tls(); |
07f397ab ILT |
1359 | if (optimized_type == tls::TLSOPT_NONE) |
1360 | { | |
7bf1f802 ILT |
1361 | // For the R_386_TLS_IE relocation, we need to create a |
1362 | // dynamic relocation when building a shared library. | |
1363 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1364 | && parameters->options().shared()) |
07f397ab | 1365 | { |
07f397ab | 1366 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1367 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1368 | output_section, object, | |
1369 | data_shndx, | |
1370 | reloc.get_r_offset()); | |
07f397ab | 1371 | } |
7bf1f802 ILT |
1372 | // Create a GOT entry for the tp-relative offset. |
1373 | Output_data_got<32, false>* got | |
1374 | = target->got_section(symtab, layout); | |
1375 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1376 | ? elfcpp::R_386_TLS_TPOFF32 | |
1377 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1378 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1379 | ? GOT_TYPE_TLS_OFFSET | |
1380 | : GOT_TYPE_TLS_NOFFSET); | |
1381 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1382 | target->rel_dyn_section(layout), |
1383 | dyn_r_type); | |
07f397ab ILT |
1384 | } |
1385 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1386 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1387 | break; |
af6359d5 | 1388 | |
56622147 ILT |
1389 | case elfcpp::R_386_TLS_LE: // Local-exec |
1390 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1391 | layout->set_has_static_tls(); |
8851ecca | 1392 | if (parameters->options().shared()) |
7bf1f802 ILT |
1393 | { |
1394 | // We need to create a dynamic relocation. | |
1395 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1396 | ? elfcpp::R_386_TLS_TPOFF32 | |
1397 | : elfcpp::R_386_TLS_TPOFF); | |
1398 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1399 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1400 | data_shndx, reloc.get_r_offset()); | |
1401 | } | |
56622147 ILT |
1402 | break; |
1403 | ||
af6359d5 ILT |
1404 | default: |
1405 | gold_unreachable(); | |
a3ad94ed ILT |
1406 | } |
1407 | } | |
92e059d8 ILT |
1408 | break; |
1409 | ||
92e059d8 ILT |
1410 | case elfcpp::R_386_32PLT: |
1411 | case elfcpp::R_386_TLS_GD_32: | |
1412 | case elfcpp::R_386_TLS_GD_PUSH: | |
1413 | case elfcpp::R_386_TLS_GD_CALL: | |
1414 | case elfcpp::R_386_TLS_GD_POP: | |
1415 | case elfcpp::R_386_TLS_LDM_32: | |
1416 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1417 | case elfcpp::R_386_TLS_LDM_CALL: | |
1418 | case elfcpp::R_386_TLS_LDM_POP: | |
1419 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1420 | default: | |
af6359d5 | 1421 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1422 | break; |
1423 | } | |
1424 | } | |
1425 | ||
1426 | // Scan relocations for a section. | |
1427 | ||
1428 | void | |
1429 | Target_i386::scan_relocs(const General_options& options, | |
1430 | Symbol_table* symtab, | |
ead1e424 | 1431 | Layout* layout, |
f6ce93d6 | 1432 | Sized_relobj<32, false>* object, |
a3ad94ed | 1433 | unsigned int data_shndx, |
92e059d8 ILT |
1434 | unsigned int sh_type, |
1435 | const unsigned char* prelocs, | |
1436 | size_t reloc_count, | |
730cdc88 ILT |
1437 | Output_section* output_section, |
1438 | bool needs_special_offset_handling, | |
92e059d8 | 1439 | size_t local_symbol_count, |
730cdc88 | 1440 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1441 | { |
1442 | if (sh_type == elfcpp::SHT_RELA) | |
1443 | { | |
75f2446e ILT |
1444 | gold_error(_("%s: unsupported RELA reloc section"), |
1445 | object->name().c_str()); | |
1446 | return; | |
92e059d8 ILT |
1447 | } |
1448 | ||
ead1e424 ILT |
1449 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1450 | Target_i386::Scan>( | |
92e059d8 ILT |
1451 | options, |
1452 | symtab, | |
ead1e424 ILT |
1453 | layout, |
1454 | this, | |
92e059d8 | 1455 | object, |
a3ad94ed | 1456 | data_shndx, |
92e059d8 ILT |
1457 | prelocs, |
1458 | reloc_count, | |
730cdc88 ILT |
1459 | output_section, |
1460 | needs_special_offset_handling, | |
92e059d8 | 1461 | local_symbol_count, |
730cdc88 | 1462 | plocal_symbols); |
92e059d8 ILT |
1463 | } |
1464 | ||
16649710 | 1465 | // Finalize the sections. |
5a6f7e2d ILT |
1466 | |
1467 | void | |
7e1edb90 | 1468 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1469 | { |
16649710 ILT |
1470 | // Fill in some more dynamic tags. |
1471 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1472 | if (odyn != NULL) | |
1473 | { | |
1474 | if (this->got_plt_ != NULL) | |
1475 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1476 | ||
1477 | if (this->plt_ != NULL) | |
1478 | { | |
1479 | const Output_data* od = this->plt_->rel_plt(); | |
1480 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1481 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1482 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1483 | } | |
1484 | ||
1485 | if (this->rel_dyn_ != NULL) | |
1486 | { | |
1487 | const Output_data* od = this->rel_dyn_; | |
1488 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1489 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1490 | odyn->add_constant(elfcpp::DT_RELENT, | |
1491 | elfcpp::Elf_sizes<32>::rel_size); | |
1492 | } | |
1493 | ||
8851ecca | 1494 | if (!parameters->options().shared()) |
16649710 ILT |
1495 | { |
1496 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1497 | // linker at run time, and used by the debugger. | |
1498 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1503 | // relocs. | |
12c0daef ILT |
1504 | if (this->copy_relocs_.any_saved_relocs()) |
1505 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1506 | } |
1507 | ||
86849f1f ILT |
1508 | // Return whether a direct absolute static relocation needs to be applied. |
1509 | // In cases where Scan::local() or Scan::global() has created | |
1510 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1511 | // of the relocation is carried in the data, and we must not | |
1512 | // apply the static relocation. | |
1513 | ||
1514 | inline bool | |
1515 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1516 | int ref_flags, |
86849f1f ILT |
1517 | bool is_32bit) |
1518 | { | |
d61c6bd4 ILT |
1519 | // For local symbols, we will have created a non-RELATIVE dynamic |
1520 | // relocation only if (a) the output is position independent, | |
1521 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1522 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1523 | if (gsym == NULL) |
8851ecca | 1524 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1525 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1526 | && !is_32bit); |
86849f1f | 1527 | |
0700cf32 ILT |
1528 | // For global symbols, we use the same helper routines used in the |
1529 | // scan pass. If we did not create a dynamic relocation, or if we | |
1530 | // created a RELATIVE dynamic relocation, we should apply the static | |
1531 | // relocation. | |
1532 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1533 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1534 | && gsym->can_use_relative_reloc(ref_flags | |
1535 | & Symbol::FUNCTION_CALL); | |
1536 | return !has_dyn || is_rel; | |
86849f1f ILT |
1537 | } |
1538 | ||
61ba1cf9 ILT |
1539 | // Perform a relocation. |
1540 | ||
ead1e424 | 1541 | inline bool |
92e059d8 | 1542 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1543 | Target_i386* target, |
92e059d8 ILT |
1544 | size_t relnum, |
1545 | const elfcpp::Rel<32, false>& rel, | |
1546 | unsigned int r_type, | |
c06b7b0b | 1547 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1548 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1549 | unsigned char* view, |
1550 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1551 | section_size_type view_size) |
61ba1cf9 | 1552 | { |
ead1e424 ILT |
1553 | if (this->skip_call_tls_get_addr_) |
1554 | { | |
1555 | if (r_type != elfcpp::R_386_PLT32 | |
1556 | || gsym == NULL | |
1557 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1558 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1559 | _("missing expected TLS relocation")); | |
1560 | else | |
ead1e424 | 1561 | { |
75f2446e ILT |
1562 | this->skip_call_tls_get_addr_ = false; |
1563 | return false; | |
ead1e424 | 1564 | } |
ead1e424 ILT |
1565 | } |
1566 | ||
a3ad94ed | 1567 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1568 | Symbol_value<32> symval; |
0700cf32 ILT |
1569 | bool is_nonpic = (r_type == elfcpp::R_386_PC8 |
1570 | || r_type == elfcpp::R_386_PC16 | |
1571 | || r_type == elfcpp::R_386_PC32); | |
436ca963 ILT |
1572 | if (gsym != NULL |
1573 | && (gsym->is_from_dynobj() | |
8851ecca | 1574 | || (parameters->options().shared() |
8fc19601 | 1575 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
0700cf32 | 1576 | && gsym->has_plt_offset() |
8851ecca | 1577 | && (!is_nonpic || !parameters->options().shared())) |
a3ad94ed | 1578 | { |
b8e6aad9 ILT |
1579 | symval.set_output_value(target->plt_section()->address() |
1580 | + gsym->plt_offset()); | |
1581 | psymval = &symval; | |
a3ad94ed ILT |
1582 | } |
1583 | ||
b8e6aad9 ILT |
1584 | const Sized_relobj<32, false>* object = relinfo->object; |
1585 | ||
1b64748b | 1586 | // Get the GOT offset if needed. |
96f2030e ILT |
1587 | // The GOT pointer points to the end of the GOT section. |
1588 | // We need to subtract the size of the GOT section to get | |
1589 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1590 | bool have_got_offset = false; |
1591 | unsigned int got_offset = 0; | |
1592 | switch (r_type) | |
1593 | { | |
1594 | case elfcpp::R_386_GOT32: | |
1595 | if (gsym != NULL) | |
1596 | { | |
0a65a3a7 CC |
1597 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1598 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1599 | - target->got_size()); | |
1b64748b ILT |
1600 | } |
1601 | else | |
1602 | { | |
1603 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1604 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1605 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1606 | - target->got_size()); | |
1b64748b ILT |
1607 | } |
1608 | have_got_offset = true; | |
1609 | break; | |
1610 | ||
1611 | default: | |
1612 | break; | |
1613 | } | |
1614 | ||
61ba1cf9 ILT |
1615 | switch (r_type) |
1616 | { | |
1617 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1618 | case elfcpp::R_386_GNU_VTINHERIT: |
1619 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1620 | break; |
1621 | ||
1622 | case elfcpp::R_386_32: | |
0700cf32 | 1623 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true)) |
86849f1f | 1624 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1625 | break; |
1626 | ||
1627 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1628 | { |
0700cf32 ILT |
1629 | int ref_flags = Symbol::NON_PIC_REF; |
1630 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1631 | ref_flags |= Symbol::FUNCTION_CALL; | |
1632 | if (should_apply_static_reloc(gsym, ref_flags, true)) | |
d61c6bd4 ILT |
1633 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1634 | } | |
92e059d8 ILT |
1635 | break; |
1636 | ||
1637 | case elfcpp::R_386_16: | |
0700cf32 | 1638 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1639 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1640 | break; |
1641 | ||
1642 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1643 | { |
0700cf32 ILT |
1644 | int ref_flags = Symbol::NON_PIC_REF; |
1645 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1646 | ref_flags |= Symbol::FUNCTION_CALL; | |
1647 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1648 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1649 | } | |
61ba1cf9 ILT |
1650 | break; |
1651 | ||
92e059d8 | 1652 | case elfcpp::R_386_8: |
0700cf32 | 1653 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1654 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1655 | break; |
1656 | ||
1657 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1658 | { |
0700cf32 ILT |
1659 | int ref_flags = Symbol::NON_PIC_REF; |
1660 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1661 | ref_flags |= Symbol::FUNCTION_CALL; | |
1662 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d61c6bd4 ILT |
1663 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1664 | } | |
92e059d8 ILT |
1665 | break; |
1666 | ||
ead1e424 | 1667 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1668 | gold_assert(gsym == NULL |
1669 | || gsym->has_plt_offset() | |
99f8faca ILT |
1670 | || gsym->final_value_is_known() |
1671 | || (gsym->is_defined() | |
1672 | && !gsym->is_from_dynobj() | |
1673 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1674 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1675 | break; |
1676 | ||
1677 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1678 | gold_assert(have_got_offset); |
1679 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1680 | break; |
1681 | ||
1682 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1683 | { |
1684 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1685 | value = (psymval->value(object, 0) | |
96f2030e | 1686 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1687 | Relocate_functions<32, false>::rel32(view, value); |
1688 | } | |
ead1e424 ILT |
1689 | break; |
1690 | ||
1691 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1692 | { |
1693 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1694 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1695 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1696 | } | |
ead1e424 ILT |
1697 | break; |
1698 | ||
92e059d8 ILT |
1699 | case elfcpp::R_386_COPY: |
1700 | case elfcpp::R_386_GLOB_DAT: | |
1701 | case elfcpp::R_386_JUMP_SLOT: | |
1702 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1703 | // These are outstanding tls relocs, which are unexpected when |
1704 | // linking. | |
92e059d8 ILT |
1705 | case elfcpp::R_386_TLS_TPOFF: |
1706 | case elfcpp::R_386_TLS_DTPMOD32: | |
1707 | case elfcpp::R_386_TLS_DTPOFF32: | |
1708 | case elfcpp::R_386_TLS_TPOFF32: | |
1709 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1710 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1711 | _("unexpected reloc %u in object file"), | |
1712 | r_type); | |
92e059d8 ILT |
1713 | break; |
1714 | ||
d61c17ea ILT |
1715 | // These are initial tls relocs, which are expected when |
1716 | // linking. | |
56622147 ILT |
1717 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1718 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1719 | case elfcpp::R_386_TLS_DESC_CALL: | |
1720 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1721 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1722 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1723 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1724 | case elfcpp::R_386_TLS_GOTIE: |
1725 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1726 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1727 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1728 | view, address, view_size); | |
92e059d8 ILT |
1729 | break; |
1730 | ||
92e059d8 ILT |
1731 | case elfcpp::R_386_32PLT: |
1732 | case elfcpp::R_386_TLS_GD_32: | |
1733 | case elfcpp::R_386_TLS_GD_PUSH: | |
1734 | case elfcpp::R_386_TLS_GD_CALL: | |
1735 | case elfcpp::R_386_TLS_GD_POP: | |
1736 | case elfcpp::R_386_TLS_LDM_32: | |
1737 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1738 | case elfcpp::R_386_TLS_LDM_CALL: | |
1739 | case elfcpp::R_386_TLS_LDM_POP: | |
1740 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1741 | default: |
75f2446e ILT |
1742 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1743 | _("unsupported reloc %u"), | |
1744 | r_type); | |
92e059d8 ILT |
1745 | break; |
1746 | } | |
ead1e424 ILT |
1747 | |
1748 | return true; | |
92e059d8 ILT |
1749 | } |
1750 | ||
1751 | // Perform a TLS relocation. | |
1752 | ||
1753 | inline void | |
1754 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1755 | Target_i386* target, |
92e059d8 ILT |
1756 | size_t relnum, |
1757 | const elfcpp::Rel<32, false>& rel, | |
1758 | unsigned int r_type, | |
c06b7b0b | 1759 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1760 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1761 | unsigned char* view, |
1762 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1763 | section_size_type view_size) |
92e059d8 ILT |
1764 | { |
1765 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1766 | |
07f397ab ILT |
1767 | const Sized_relobj<32, false>* object = relinfo->object; |
1768 | ||
1769 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1770 | |
8851ecca ILT |
1771 | const bool is_final = |
1772 | (gsym == NULL | |
1773 | ? !parameters->options().output_is_position_independent() | |
1774 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1775 | const tls::Tls_optimization optimized_type |
1776 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1777 | switch (r_type) |
1778 | { | |
56622147 | 1779 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1780 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1781 | { |
07f397ab | 1782 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1783 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1784 | rel, r_type, value, view, | |
1785 | view_size); | |
92e059d8 ILT |
1786 | break; |
1787 | } | |
07f397ab ILT |
1788 | else |
1789 | { | |
c2b45e22 CC |
1790 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1791 | ? GOT_TYPE_TLS_NOFFSET | |
1792 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1793 | unsigned int got_offset; |
1794 | if (gsym != NULL) | |
1795 | { | |
c2b45e22 CC |
1796 | gold_assert(gsym->has_got_offset(got_type)); |
1797 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1798 | } |
1799 | else | |
1800 | { | |
1801 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1802 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1803 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1804 | - target->got_size()); |
1805 | } | |
1806 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1807 | { | |
1808 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1809 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1810 | got_offset, view, view_size); | |
07f397ab ILT |
1811 | break; |
1812 | } | |
1813 | else if (optimized_type == tls::TLSOPT_NONE) | |
1814 | { | |
1815 | // Relocate the field with the offset of the pair of GOT | |
1816 | // entries. | |
1817 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1818 | break; | |
1819 | } | |
1820 | } | |
75f2446e ILT |
1821 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1822 | _("unsupported reloc %u"), | |
1823 | r_type); | |
92e059d8 ILT |
1824 | break; |
1825 | ||
56622147 ILT |
1826 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1827 | case elfcpp::R_386_TLS_DESC_CALL: | |
c2b45e22 CC |
1828 | if (optimized_type == tls::TLSOPT_TO_LE) |
1829 | { | |
1830 | gold_assert(tls_segment != NULL); | |
1831 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1832 | rel, r_type, value, view, | |
1833 | view_size); | |
1834 | break; | |
1835 | } | |
1836 | else | |
1837 | { | |
1838 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1839 | ? GOT_TYPE_TLS_NOFFSET | |
1840 | : GOT_TYPE_TLS_DESC); | |
1841 | unsigned int got_offset; | |
1842 | if (gsym != NULL) | |
1843 | { | |
1844 | gold_assert(gsym->has_got_offset(got_type)); | |
1845 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1846 | } | |
1847 | else | |
1848 | { | |
1849 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1850 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1851 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1852 | - target->got_size()); | |
1853 | } | |
1854 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1855 | { | |
1856 | gold_assert(tls_segment != NULL); | |
1857 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1858 | got_offset, view, view_size); | |
1859 | break; | |
1860 | } | |
1861 | else if (optimized_type == tls::TLSOPT_NONE) | |
1862 | { | |
1863 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
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 | } | |
1869 | break; | |
1870 | } | |
1871 | } | |
75f2446e ILT |
1872 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1873 | _("unsupported reloc %u"), | |
1874 | r_type); | |
ead1e424 ILT |
1875 | break; |
1876 | ||
56622147 | 1877 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1878 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1879 | { | |
75f2446e ILT |
1880 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1881 | _("both SUN and GNU model " | |
1882 | "TLS relocations")); | |
1883 | break; | |
46cf9fa2 ILT |
1884 | } |
1885 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1886 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1887 | { |
07f397ab | 1888 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1889 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1890 | value, view, view_size); | |
1891 | break; | |
1892 | } | |
07f397ab ILT |
1893 | else if (optimized_type == tls::TLSOPT_NONE) |
1894 | { | |
1895 | // Relocate the field with the offset of the GOT entry for | |
1896 | // the module index. | |
1897 | unsigned int got_offset; | |
94c4710f ILT |
1898 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1899 | - target->got_size()); | |
07f397ab ILT |
1900 | Relocate_functions<32, false>::rel32(view, got_offset); |
1901 | break; | |
1902 | } | |
75f2446e ILT |
1903 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1904 | _("unsupported reloc %u"), | |
1905 | r_type); | |
46cf9fa2 ILT |
1906 | break; |
1907 | ||
56622147 | 1908 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1909 | // This reloc can appear in debugging sections, in which case we |
1910 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1911 | // tells us this. | |
94c4710f ILT |
1912 | if (optimized_type == tls::TLSOPT_TO_LE) |
1913 | { | |
1914 | gold_assert(tls_segment != NULL); | |
1915 | value -= tls_segment->memsz(); | |
1916 | } | |
46cf9fa2 ILT |
1917 | Relocate_functions<32, false>::rel32(view, value); |
1918 | break; | |
1919 | ||
56622147 ILT |
1920 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1921 | case elfcpp::R_386_TLS_GOTIE: | |
1922 | case elfcpp::R_386_TLS_IE_32: | |
1923 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1924 | { | |
07f397ab | 1925 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1926 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1927 | rel, r_type, value, view, | |
1928 | view_size); | |
1929 | break; | |
1930 | } | |
07f397ab ILT |
1931 | else if (optimized_type == tls::TLSOPT_NONE) |
1932 | { | |
1933 | // Relocate the field with the offset of the GOT entry for | |
1934 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
1935 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1936 | ? GOT_TYPE_TLS_OFFSET | |
1937 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
1938 | unsigned int got_offset; |
1939 | if (gsym != NULL) | |
1940 | { | |
c2b45e22 CC |
1941 | gold_assert(gsym->has_got_offset(got_type)); |
1942 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
1943 | } |
1944 | else | |
1945 | { | |
1946 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1947 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1948 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
1949 | } |
1950 | // For the R_386_TLS_IE relocation, we need to apply the | |
1951 | // absolute address of the GOT entry. | |
1952 | if (r_type == elfcpp::R_386_TLS_IE) | |
1953 | got_offset += target->got_plt_section()->address(); | |
1954 | // All GOT offsets are relative to the end of the GOT. | |
1955 | got_offset -= target->got_size(); | |
1956 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1957 | break; | |
1958 | } | |
75f2446e ILT |
1959 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1960 | _("unsupported reloc %u"), | |
1961 | r_type); | |
92e059d8 | 1962 | break; |
92e059d8 | 1963 | |
56622147 | 1964 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
1965 | // If we're creating a shared library, a dynamic relocation will |
1966 | // have been created for this location, so do not apply it now. | |
8851ecca | 1967 | if (!parameters->options().shared()) |
7bf1f802 ILT |
1968 | { |
1969 | gold_assert(tls_segment != NULL); | |
1970 | value -= tls_segment->memsz(); | |
1971 | Relocate_functions<32, false>::rel32(view, value); | |
1972 | } | |
56622147 | 1973 | break; |
92e059d8 | 1974 | |
56622147 | 1975 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
1976 | // If we're creating a shared library, a dynamic relocation will |
1977 | // have been created for this location, so do not apply it now. | |
8851ecca | 1978 | if (!parameters->options().shared()) |
7bf1f802 ILT |
1979 | { |
1980 | gold_assert(tls_segment != NULL); | |
1981 | value = tls_segment->memsz() - value; | |
1982 | Relocate_functions<32, false>::rel32(view, value); | |
1983 | } | |
56622147 | 1984 | break; |
92e059d8 | 1985 | } |
92e059d8 ILT |
1986 | } |
1987 | ||
e041f13d | 1988 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
1989 | // Local-Exec. |
1990 | ||
1991 | inline void | |
1992 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
1993 | size_t relnum, | |
1994 | Output_segment* tls_segment, | |
1995 | const elfcpp::Rel<32, false>& rel, | |
1996 | unsigned int, | |
1997 | elfcpp::Elf_types<32>::Elf_Addr value, | |
1998 | unsigned char* view, | |
fe8718a4 | 1999 | section_size_type view_size) |
ead1e424 ILT |
2000 | { |
2001 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2002 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2003 | // leal foo(%reg),%eax; call ___tls_get_addr |
2004 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2005 | ||
af6359d5 ILT |
2006 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2007 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2008 | |
2009 | unsigned char op1 = view[-1]; | |
2010 | unsigned char op2 = view[-2]; | |
2011 | ||
af6359d5 ILT |
2012 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2013 | op2 == 0x8d || op2 == 0x04); | |
2014 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2015 | |
2016 | int roff = 5; | |
2017 | ||
2018 | if (op2 == 0x04) | |
2019 | { | |
af6359d5 ILT |
2020 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2021 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2022 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2023 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2024 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2025 | } | |
2026 | else | |
2027 | { | |
af6359d5 ILT |
2028 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2029 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2030 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2031 | && view[9] == 0x90) |
ead1e424 ILT |
2032 | { |
2033 | // There is a trailing nop. Use the size byte subl. | |
2034 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2035 | roff = 6; | |
2036 | } | |
2037 | else | |
2038 | { | |
2039 | // Use the five byte subl. | |
2040 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2041 | } | |
2042 | } | |
2043 | ||
7bf1f802 | 2044 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2045 | Relocate_functions<32, false>::rel32(view + roff, value); |
2046 | ||
2047 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2048 | // We can skip it. | |
2049 | this->skip_call_tls_get_addr_ = true; | |
2050 | } | |
2051 | ||
7bf1f802 | 2052 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2053 | // Initial-Exec. |
2054 | ||
2055 | inline void | |
2056 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2057 | size_t relnum, | |
c2b45e22 | 2058 | Output_segment*, |
07f397ab ILT |
2059 | const elfcpp::Rel<32, false>& rel, |
2060 | unsigned int, | |
2061 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2062 | unsigned char* view, | |
fe8718a4 | 2063 | section_size_type view_size) |
07f397ab ILT |
2064 | { |
2065 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2066 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2067 | ||
2068 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2069 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2070 | ||
2071 | unsigned char op1 = view[-1]; | |
2072 | unsigned char op2 = view[-2]; | |
2073 | ||
2074 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2075 | op2 == 0x8d || op2 == 0x04); | |
2076 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2077 | ||
2078 | int roff = 5; | |
2079 | ||
c2b45e22 CC |
2080 | // FIXME: For now, support only the first (SIB) form. |
2081 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2082 | |
2083 | if (op2 == 0x04) | |
2084 | { | |
2085 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2086 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2087 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2088 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2089 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2090 | } | |
2091 | else | |
2092 | { | |
2093 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2094 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2095 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2096 | && view[9] == 0x90) |
2097 | { | |
2098 | // FIXME: This is not the right instruction sequence. | |
2099 | // There is a trailing nop. Use the size byte subl. | |
2100 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2101 | roff = 6; | |
2102 | } | |
2103 | else | |
2104 | { | |
2105 | // FIXME: This is not the right instruction sequence. | |
2106 | // Use the five byte subl. | |
2107 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2108 | } | |
2109 | } | |
2110 | ||
07f397ab ILT |
2111 | Relocate_functions<32, false>::rel32(view + roff, value); |
2112 | ||
2113 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2114 | // We can skip it. | |
2115 | this->skip_call_tls_get_addr_ = true; | |
2116 | } | |
2117 | ||
c2b45e22 CC |
2118 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2119 | // General-Dynamic to a Local-Exec. | |
2120 | ||
2121 | inline void | |
2122 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2123 | const Relocate_info<32, false>* relinfo, | |
2124 | size_t relnum, | |
2125 | Output_segment* tls_segment, | |
2126 | const elfcpp::Rel<32, false>& rel, | |
2127 | unsigned int r_type, | |
2128 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2129 | unsigned char* view, | |
2130 | section_size_type view_size) | |
2131 | { | |
2132 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2133 | { | |
2134 | // leal foo@TLSDESC(%ebx), %eax | |
2135 | // ==> leal foo@NTPOFF, %eax | |
2136 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2137 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2138 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2139 | view[-2] == 0x8d && view[-1] == 0x83); | |
2140 | view[-1] = 0x05; | |
2141 | value -= tls_segment->memsz(); | |
2142 | Relocate_functions<32, false>::rel32(view, value); | |
2143 | } | |
2144 | else | |
2145 | { | |
2146 | // call *foo@TLSCALL(%eax) | |
2147 | // ==> nop; nop | |
2148 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2149 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2150 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2151 | view[0] == 0xff && view[1] == 0x10); | |
2152 | view[0] = 0x66; | |
2153 | view[1] = 0x90; | |
2154 | } | |
2155 | } | |
2156 | ||
2157 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2158 | // General-Dynamic to an Initial-Exec. | |
2159 | ||
2160 | inline void | |
2161 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2162 | const Relocate_info<32, false>* relinfo, | |
2163 | size_t relnum, | |
2164 | Output_segment*, | |
2165 | const elfcpp::Rel<32, false>& rel, | |
2166 | unsigned int r_type, | |
2167 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2168 | unsigned char* view, | |
2169 | section_size_type view_size) | |
2170 | { | |
2171 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2172 | { | |
2173 | // leal foo@TLSDESC(%ebx), %eax | |
2174 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2175 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2176 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2177 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2178 | view[-2] == 0x8d && view[-1] == 0x83); | |
2179 | view[-2] = 0x8b; | |
2180 | Relocate_functions<32, false>::rel32(view, value); | |
2181 | } | |
2182 | else | |
2183 | { | |
2184 | // call *foo@TLSCALL(%eax) | |
2185 | // ==> nop; nop | |
2186 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2187 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2188 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2189 | view[0] == 0xff && view[1] == 0x10); | |
2190 | view[0] = 0x66; | |
2191 | view[1] = 0x90; | |
2192 | } | |
2193 | } | |
2194 | ||
46cf9fa2 ILT |
2195 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2196 | // Local-Exec. | |
2197 | ||
2198 | inline void | |
2199 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2200 | size_t relnum, | |
2201 | Output_segment*, | |
2202 | const elfcpp::Rel<32, false>& rel, | |
2203 | unsigned int, | |
2204 | elfcpp::Elf_types<32>::Elf_Addr, | |
2205 | unsigned char* view, | |
fe8718a4 | 2206 | section_size_type view_size) |
46cf9fa2 ILT |
2207 | { |
2208 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2209 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2210 | ||
af6359d5 ILT |
2211 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2212 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2213 | |
2214 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2215 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2216 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2217 | |
af6359d5 | 2218 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2219 | |
2220 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2221 | ||
2222 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2223 | // We can skip it. | |
2224 | this->skip_call_tls_get_addr_ = true; | |
2225 | } | |
2226 | ||
56622147 ILT |
2227 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2228 | // Local-Exec. | |
2229 | ||
2230 | inline void | |
2231 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2232 | size_t relnum, | |
2233 | Output_segment* tls_segment, | |
2234 | const elfcpp::Rel<32, false>& rel, | |
2235 | unsigned int r_type, | |
2236 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2237 | unsigned char* view, | |
fe8718a4 | 2238 | section_size_type view_size) |
56622147 ILT |
2239 | { |
2240 | // We have to actually change the instructions, which means that we | |
2241 | // need to examine the opcodes to figure out which instruction we | |
2242 | // are looking at. | |
2243 | if (r_type == elfcpp::R_386_TLS_IE) | |
2244 | { | |
2245 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2246 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2247 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2248 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2249 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2250 | ||
2251 | unsigned char op1 = view[-1]; | |
2252 | if (op1 == 0xa1) | |
2253 | { | |
2254 | // movl XX,%eax ==> movl $YY,%eax | |
2255 | view[-1] = 0xb8; | |
2256 | } | |
2257 | else | |
2258 | { | |
2259 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2260 | ||
2261 | unsigned char op2 = view[-2]; | |
2262 | if (op2 == 0x8b) | |
2263 | { | |
2264 | // movl XX,%reg ==> movl $YY,%reg | |
2265 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2266 | (op1 & 0xc7) == 0x05); | |
2267 | view[-2] = 0xc7; | |
2268 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2269 | } | |
2270 | else if (op2 == 0x03) | |
2271 | { | |
2272 | // addl XX,%reg ==> addl $YY,%reg | |
2273 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2274 | (op1 & 0xc7) == 0x05); | |
2275 | view[-2] = 0x81; | |
2276 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2277 | } | |
2278 | else | |
2279 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2280 | } | |
2281 | } | |
2282 | else | |
2283 | { | |
2284 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2285 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2286 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2287 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2288 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2289 | ||
2290 | unsigned char op1 = view[-1]; | |
2291 | unsigned char op2 = view[-2]; | |
2292 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2293 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2294 | if (op2 == 0x8b) | |
2295 | { | |
2296 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2297 | view[-2] = 0xc7; | |
2298 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2299 | } | |
2300 | else if (op2 == 0x2b) | |
2301 | { | |
2302 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2303 | view[-2] = 0x81; | |
2304 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2305 | } | |
2306 | else if (op2 == 0x03) | |
2307 | { | |
2308 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2309 | view[-2] = 0x81; | |
2310 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2311 | } | |
2312 | else | |
2313 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2314 | } | |
2315 | ||
7bf1f802 | 2316 | value = tls_segment->memsz() - value; |
56622147 ILT |
2317 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2318 | value = - value; | |
2319 | ||
2320 | Relocate_functions<32, false>::rel32(view, value); | |
2321 | } | |
2322 | ||
61ba1cf9 ILT |
2323 | // Relocate section data. |
2324 | ||
2325 | void | |
92e059d8 | 2326 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2327 | unsigned int sh_type, |
2328 | const unsigned char* prelocs, | |
2329 | size_t reloc_count, | |
730cdc88 ILT |
2330 | Output_section* output_section, |
2331 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2332 | unsigned char* view, |
2333 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2334 | section_size_type view_size) |
61ba1cf9 | 2335 | { |
a3ad94ed | 2336 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2337 | |
ead1e424 ILT |
2338 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2339 | Target_i386::Relocate>( | |
92e059d8 | 2340 | relinfo, |
ead1e424 | 2341 | this, |
61ba1cf9 ILT |
2342 | prelocs, |
2343 | reloc_count, | |
730cdc88 ILT |
2344 | output_section, |
2345 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2346 | view, |
2347 | address, | |
2348 | view_size); | |
2349 | } | |
2350 | ||
6a74a719 ILT |
2351 | // Return the size of a relocation while scanning during a relocatable |
2352 | // link. | |
2353 | ||
2354 | unsigned int | |
2355 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2356 | unsigned int r_type, | |
2357 | Relobj* object) | |
2358 | { | |
2359 | switch (r_type) | |
2360 | { | |
2361 | case elfcpp::R_386_NONE: | |
2362 | case elfcpp::R_386_GNU_VTINHERIT: | |
2363 | case elfcpp::R_386_GNU_VTENTRY: | |
2364 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2365 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2366 | case elfcpp::R_386_TLS_DESC_CALL: | |
2367 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2368 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2369 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2370 | case elfcpp::R_386_TLS_IE_32: | |
2371 | case elfcpp::R_386_TLS_GOTIE: | |
2372 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2373 | case elfcpp::R_386_TLS_LE_32: | |
2374 | return 0; | |
2375 | ||
2376 | case elfcpp::R_386_32: | |
2377 | case elfcpp::R_386_PC32: | |
2378 | case elfcpp::R_386_GOT32: | |
2379 | case elfcpp::R_386_PLT32: | |
2380 | case elfcpp::R_386_GOTOFF: | |
2381 | case elfcpp::R_386_GOTPC: | |
2382 | return 4; | |
2383 | ||
2384 | case elfcpp::R_386_16: | |
2385 | case elfcpp::R_386_PC16: | |
2386 | return 2; | |
2387 | ||
2388 | case elfcpp::R_386_8: | |
2389 | case elfcpp::R_386_PC8: | |
2390 | return 1; | |
2391 | ||
2392 | // These are relocations which should only be seen by the | |
2393 | // dynamic linker, and should never be seen here. | |
2394 | case elfcpp::R_386_COPY: | |
2395 | case elfcpp::R_386_GLOB_DAT: | |
2396 | case elfcpp::R_386_JUMP_SLOT: | |
2397 | case elfcpp::R_386_RELATIVE: | |
2398 | case elfcpp::R_386_TLS_TPOFF: | |
2399 | case elfcpp::R_386_TLS_DTPMOD32: | |
2400 | case elfcpp::R_386_TLS_DTPOFF32: | |
2401 | case elfcpp::R_386_TLS_TPOFF32: | |
2402 | case elfcpp::R_386_TLS_DESC: | |
2403 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2404 | return 0; | |
2405 | ||
2406 | case elfcpp::R_386_32PLT: | |
2407 | case elfcpp::R_386_TLS_GD_32: | |
2408 | case elfcpp::R_386_TLS_GD_PUSH: | |
2409 | case elfcpp::R_386_TLS_GD_CALL: | |
2410 | case elfcpp::R_386_TLS_GD_POP: | |
2411 | case elfcpp::R_386_TLS_LDM_32: | |
2412 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2413 | case elfcpp::R_386_TLS_LDM_CALL: | |
2414 | case elfcpp::R_386_TLS_LDM_POP: | |
2415 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2416 | default: | |
2417 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2418 | return 0; | |
2419 | } | |
2420 | } | |
2421 | ||
2422 | // Scan the relocs during a relocatable link. | |
2423 | ||
2424 | void | |
2425 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2426 | Symbol_table* symtab, | |
2427 | Layout* layout, | |
2428 | Sized_relobj<32, false>* object, | |
2429 | unsigned int data_shndx, | |
2430 | unsigned int sh_type, | |
2431 | const unsigned char* prelocs, | |
2432 | size_t reloc_count, | |
2433 | Output_section* output_section, | |
2434 | bool needs_special_offset_handling, | |
2435 | size_t local_symbol_count, | |
2436 | const unsigned char* plocal_symbols, | |
2437 | Relocatable_relocs* rr) | |
2438 | { | |
2439 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2440 | ||
2441 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2442 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2443 | ||
7019cd25 | 2444 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2445 | Scan_relocatable_relocs>( |
2446 | options, | |
2447 | symtab, | |
2448 | layout, | |
2449 | object, | |
2450 | data_shndx, | |
2451 | prelocs, | |
2452 | reloc_count, | |
2453 | output_section, | |
2454 | needs_special_offset_handling, | |
2455 | local_symbol_count, | |
2456 | plocal_symbols, | |
2457 | rr); | |
2458 | } | |
2459 | ||
2460 | // Relocate a section during a relocatable link. | |
2461 | ||
2462 | void | |
2463 | Target_i386::relocate_for_relocatable( | |
2464 | const Relocate_info<32, false>* relinfo, | |
2465 | unsigned int sh_type, | |
2466 | const unsigned char* prelocs, | |
2467 | size_t reloc_count, | |
2468 | Output_section* output_section, | |
2469 | off_t offset_in_output_section, | |
2470 | const Relocatable_relocs* rr, | |
2471 | unsigned char* view, | |
2472 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2473 | section_size_type view_size, | |
2474 | unsigned char* reloc_view, | |
2475 | section_size_type reloc_view_size) | |
2476 | { | |
2477 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2478 | ||
7019cd25 | 2479 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2480 | relinfo, |
2481 | prelocs, | |
2482 | reloc_count, | |
2483 | output_section, | |
2484 | offset_in_output_section, | |
2485 | rr, | |
2486 | view, | |
2487 | view_address, | |
2488 | view_size, | |
2489 | reloc_view, | |
2490 | reloc_view_size); | |
2491 | } | |
2492 | ||
ab5c9e90 ILT |
2493 | // Return the value to use for a dynamic which requires special |
2494 | // treatment. This is how we support equality comparisons of function | |
2495 | // pointers across shared library boundaries, as described in the | |
2496 | // processor specific ABI supplement. | |
2497 | ||
2498 | uint64_t | |
2499 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2500 | { | |
2501 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2502 | return this->plt_section()->address() + gsym->plt_offset(); | |
2503 | } | |
2504 | ||
c51e6221 ILT |
2505 | // Return a string used to fill a code section with nops to take up |
2506 | // the specified length. | |
2507 | ||
2508 | std::string | |
8851ecca | 2509 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2510 | { |
2511 | if (length >= 16) | |
2512 | { | |
2513 | // Build a jmp instruction to skip over the bytes. | |
2514 | unsigned char jmp[5]; | |
2515 | jmp[0] = 0xe9; | |
2516 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2517 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2518 | + std::string(length - 5, '\0')); | |
2519 | } | |
2520 | ||
2521 | // Nop sequences of various lengths. | |
2522 | const char nop1[1] = { 0x90 }; // nop | |
2523 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2524 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2525 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2526 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2527 | 0x00 }; // leal 0(%esi,1),%esi | |
2528 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2529 | 0x00, 0x00 }; | |
2530 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2531 | 0x00, 0x00, 0x00 }; | |
2532 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2533 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2534 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2535 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2536 | 0x00 }; | |
2537 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2538 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2539 | 0x00, 0x00 }; | |
2540 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2541 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2542 | 0x00, 0x00, 0x00 }; | |
2543 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2544 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2545 | 0x00, 0x00, 0x00, 0x00 }; | |
2546 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2547 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2548 | 0x27, 0x00, 0x00, 0x00, | |
2549 | 0x00 }; | |
2550 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2551 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2552 | 0xbc, 0x27, 0x00, 0x00, | |
2553 | 0x00, 0x00 }; | |
2554 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2555 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2556 | 0x90, 0x90, 0x90, 0x90, | |
2557 | 0x90, 0x90, 0x90 }; | |
2558 | ||
2559 | const char* nops[16] = { | |
2560 | NULL, | |
2561 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2562 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2563 | }; | |
2564 | ||
2565 | return std::string(nops[length], length); | |
2566 | } | |
2567 | ||
14bfc3f5 ILT |
2568 | // The selector for i386 object files. |
2569 | ||
2570 | class Target_selector_i386 : public Target_selector | |
2571 | { | |
2572 | public: | |
2573 | Target_selector_i386() | |
e96caa79 | 2574 | : Target_selector(elfcpp::EM_386, 32, false, "elf32-i386") |
14bfc3f5 ILT |
2575 | { } |
2576 | ||
2577 | Target* | |
e96caa79 ILT |
2578 | do_instantiate_target() |
2579 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2580 | }; |
2581 | ||
14bfc3f5 ILT |
2582 | Target_selector_i386 target_selector_i386; |
2583 | ||
2584 | } // End anonymous namespace. |