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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 |
ef9beddf ILT |
360 | copy_reloc(Symbol_table* symtab, Layout* layout, |
361 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
362 | unsigned int shndx, Output_section* output_section, |
363 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
364 | { | |
365 | this->copy_relocs_.copy_reloc(symtab, layout, | |
366 | symtab->get_sized_symbol<32>(sym), | |
367 | object, shndx, output_section, reloc, | |
368 | this->rel_dyn_section(layout)); | |
369 | } | |
ead1e424 | 370 | |
92e059d8 ILT |
371 | // Information about this specific target which we pass to the |
372 | // general Target structure. | |
75f65a3e | 373 | static const Target::Target_info i386_info; |
ead1e424 | 374 | |
0a65a3a7 CC |
375 | // The types of GOT entries needed for this platform. |
376 | enum Got_type | |
377 | { | |
378 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
379 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
380 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
381 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
382 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
383 | }; |
384 | ||
ead1e424 | 385 | // The GOT section. |
dbe717ef | 386 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
387 | // The PLT section. |
388 | Output_data_plt_i386* plt_; | |
389 | // The GOT PLT section. | |
390 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
391 | // The dynamic reloc section. |
392 | Reloc_section* rel_dyn_; | |
393 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 394 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
395 | // Space for variables copied with a COPY reloc. |
396 | Output_data_space* dynbss_; | |
c2b45e22 | 397 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 398 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
399 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
400 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
401 | }; |
402 | ||
403 | const Target::Target_info Target_i386::i386_info = | |
404 | { | |
61ba1cf9 ILT |
405 | 32, // size |
406 | false, // is_big_endian | |
407 | elfcpp::EM_386, // machine_code | |
408 | false, // has_make_symbol | |
dbe717ef | 409 | false, // has_resolve |
c51e6221 | 410 | true, // has_code_fill |
35cdfc9a | 411 | true, // is_default_stack_executable |
0864d551 | 412 | '\0', // wrap_char |
dbe717ef | 413 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 414 | 0x08048000, // default_text_segment_address |
cd72c291 ILT |
415 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
416 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
14bfc3f5 ILT |
417 | }; |
418 | ||
ead1e424 ILT |
419 | // Get the GOT section, creating it if necessary. |
420 | ||
dbe717ef | 421 | Output_data_got<32, false>* |
7e1edb90 | 422 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
423 | { |
424 | if (this->got_ == NULL) | |
425 | { | |
7e1edb90 | 426 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 427 | |
7e1edb90 | 428 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 429 | |
9f1d377b ILT |
430 | Output_section* os; |
431 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
432 | (elfcpp::SHF_ALLOC | |
433 | | elfcpp::SHF_WRITE), | |
434 | this->got_); | |
435 | os->set_is_relro(); | |
ead1e424 | 436 | |
a3ad94ed ILT |
437 | // The old GNU linker creates a .got.plt section. We just |
438 | // create another set of data in the .got section. Note that we | |
439 | // always create a PLT if we create a GOT, although the PLT | |
440 | // might be empty. | |
7d9e3d98 | 441 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
9f1d377b ILT |
442 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
443 | (elfcpp::SHF_ALLOC | |
444 | | elfcpp::SHF_WRITE), | |
445 | this->got_plt_); | |
446 | os->set_is_relro(); | |
a3ad94ed | 447 | |
ead1e424 | 448 | // The first three entries are reserved. |
27bc2bce | 449 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 450 | |
a3ad94ed | 451 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 452 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 453 | this->got_plt_, |
ead1e424 | 454 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 455 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
456 | elfcpp::STV_HIDDEN, 0, |
457 | false, false); | |
458 | } | |
a3ad94ed | 459 | |
ead1e424 ILT |
460 | return this->got_; |
461 | } | |
462 | ||
5a6f7e2d ILT |
463 | // Get the dynamic reloc section, creating it if necessary. |
464 | ||
465 | Target_i386::Reloc_section* | |
466 | Target_i386::rel_dyn_section(Layout* layout) | |
467 | { | |
468 | if (this->rel_dyn_ == NULL) | |
469 | { | |
470 | gold_assert(layout != NULL); | |
d98bc257 | 471 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d ILT |
472 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
473 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
474 | } | |
475 | return this->rel_dyn_; | |
476 | } | |
477 | ||
a3ad94ed ILT |
478 | // A class to handle the PLT data. |
479 | ||
480 | class Output_data_plt_i386 : public Output_section_data | |
481 | { | |
482 | public: | |
483 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
484 | ||
7e1edb90 | 485 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
486 | |
487 | // Add an entry to the PLT. | |
488 | void | |
489 | add_entry(Symbol* gsym); | |
490 | ||
16649710 ILT |
491 | // Return the .rel.plt section data. |
492 | const Reloc_section* | |
493 | rel_plt() const | |
494 | { return this->rel_; } | |
495 | ||
496 | protected: | |
497 | void | |
498 | do_adjust_output_section(Output_section* os); | |
499 | ||
7d9e3d98 ILT |
500 | // Write to a map file. |
501 | void | |
502 | do_print_to_mapfile(Mapfile* mapfile) const | |
503 | { mapfile->print_output_data(this, _("** PLT")); } | |
504 | ||
a3ad94ed ILT |
505 | private: |
506 | // The size of an entry in the PLT. | |
507 | static const int plt_entry_size = 16; | |
508 | ||
509 | // The first entry in the PLT for an executable. | |
510 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
511 | ||
512 | // The first entry in the PLT for a shared object. | |
513 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
514 | ||
515 | // Other entries in the PLT for an executable. | |
516 | static unsigned char exec_plt_entry[plt_entry_size]; | |
517 | ||
518 | // Other entries in the PLT for a shared object. | |
519 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
520 | ||
521 | // Set the final size. | |
522 | void | |
27bc2bce | 523 | set_final_data_size() |
a3ad94ed ILT |
524 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
525 | ||
526 | // Write out the PLT data. | |
527 | void | |
528 | do_write(Output_file*); | |
529 | ||
530 | // The reloc section. | |
531 | Reloc_section* rel_; | |
532 | // The .got.plt section. | |
533 | Output_data_space* got_plt_; | |
534 | // The number of PLT entries. | |
535 | unsigned int count_; | |
a3ad94ed ILT |
536 | }; |
537 | ||
538 | // Create the PLT section. The ordinary .got section is an argument, | |
539 | // since we need to refer to the start. We also create our own .got | |
540 | // section just for PLT entries. | |
541 | ||
542 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 543 | Output_data_space* got_plt) |
80576242 | 544 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed | 545 | { |
d98bc257 | 546 | this->rel_ = new Reloc_section(false); |
a3ad94ed ILT |
547 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
548 | elfcpp::SHF_ALLOC, this->rel_); | |
549 | } | |
550 | ||
16649710 ILT |
551 | void |
552 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
553 | { | |
554 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
555 | // linker, and so do we. | |
556 | os->set_entsize(4); | |
557 | } | |
558 | ||
a3ad94ed ILT |
559 | // Add an entry to the PLT. |
560 | ||
561 | void | |
562 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
563 | { | |
564 | gold_assert(!gsym->has_plt_offset()); | |
565 | ||
566 | // Note that when setting the PLT offset we skip the initial | |
567 | // reserved PLT entry. | |
568 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
569 | ||
570 | ++this->count_; | |
571 | ||
fe8718a4 | 572 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
573 | |
574 | // Every PLT entry needs a GOT entry which points back to the PLT | |
575 | // entry (this will be changed by the dynamic linker, normally | |
576 | // lazily when the function is called). | |
27bc2bce | 577 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
578 | |
579 | // Every PLT entry needs a reloc. | |
16649710 | 580 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
581 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
582 | got_offset); | |
583 | ||
584 | // Note that we don't need to save the symbol. The contents of the | |
585 | // PLT are independent of which symbols are used. The symbols only | |
586 | // appear in the relocations. | |
587 | } | |
588 | ||
589 | // The first entry in the PLT for an executable. | |
590 | ||
591 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
592 | { | |
593 | 0xff, 0x35, // pushl contents of memory address | |
594 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
595 | 0xff, 0x25, // jmp indirect | |
596 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
597 | 0, 0, 0, 0 // unused | |
598 | }; | |
599 | ||
600 | // The first entry in the PLT for a shared object. | |
601 | ||
602 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
603 | { | |
604 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
605 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
606 | 0, 0, 0, 0 // unused | |
607 | }; | |
608 | ||
609 | // Subsequent entries in the PLT for an executable. | |
610 | ||
611 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
612 | { | |
613 | 0xff, 0x25, // jmp indirect | |
614 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
615 | 0x68, // pushl immediate | |
616 | 0, 0, 0, 0, // replaced with offset into relocation table | |
617 | 0xe9, // jmp relative | |
618 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
619 | }; | |
620 | ||
621 | // Subsequent entries in the PLT for a shared object. | |
622 | ||
623 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
624 | { | |
625 | 0xff, 0xa3, // jmp *offset(%ebx) | |
626 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
627 | 0x68, // pushl immediate | |
628 | 0, 0, 0, 0, // replaced with offset into relocation table | |
629 | 0xe9, // jmp relative | |
630 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
631 | }; | |
632 | ||
633 | // Write out the PLT. This uses the hand-coded instructions above, | |
634 | // and adjusts them as needed. This is all specified by the i386 ELF | |
635 | // Processor Supplement. | |
636 | ||
637 | void | |
638 | Output_data_plt_i386::do_write(Output_file* of) | |
639 | { | |
640 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
641 | const section_size_type oview_size = |
642 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
643 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
644 | ||
645 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
646 | const section_size_type got_size = |
647 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
648 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
649 | got_size); | |
650 | ||
651 | unsigned char* pov = oview; | |
652 | ||
653 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
654 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
655 | ||
8851ecca | 656 | if (parameters->options().shared()) |
a3ad94ed ILT |
657 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
658 | else | |
659 | { | |
660 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
661 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
662 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
663 | } | |
664 | pov += plt_entry_size; | |
665 | ||
666 | unsigned char* got_pov = got_view; | |
667 | ||
668 | memset(got_pov, 0, 12); | |
669 | got_pov += 12; | |
670 | ||
671 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
672 | ||
673 | unsigned int plt_offset = plt_entry_size; | |
674 | unsigned int plt_rel_offset = 0; | |
675 | unsigned int got_offset = 12; | |
676 | const unsigned int count = this->count_; | |
677 | for (unsigned int i = 0; | |
678 | i < count; | |
679 | ++i, | |
680 | pov += plt_entry_size, | |
681 | got_pov += 4, | |
682 | plt_offset += plt_entry_size, | |
683 | plt_rel_offset += rel_size, | |
684 | got_offset += 4) | |
685 | { | |
686 | // Set and adjust the PLT entry itself. | |
687 | ||
8851ecca | 688 | if (parameters->options().shared()) |
a3ad94ed ILT |
689 | { |
690 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
691 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
692 | } | |
693 | else | |
694 | { | |
695 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
696 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
697 | (got_address | |
698 | + got_offset)); | |
699 | } | |
700 | ||
701 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
702 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
703 | - (plt_offset + plt_entry_size)); | |
704 | ||
705 | // Set the entry in the GOT. | |
706 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
707 | } | |
708 | ||
fe8718a4 ILT |
709 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
710 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
711 | |
712 | of->write_output_view(offset, oview_size, oview); | |
713 | of->write_output_view(got_file_offset, got_size, got_view); | |
714 | } | |
715 | ||
716 | // Create a PLT entry for a global symbol. | |
717 | ||
718 | void | |
7e1edb90 | 719 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
720 | { |
721 | if (gsym->has_plt_offset()) | |
722 | return; | |
723 | ||
724 | if (this->plt_ == NULL) | |
725 | { | |
726 | // Create the GOT sections first. | |
7e1edb90 | 727 | this->got_section(symtab, layout); |
a3ad94ed | 728 | |
7e1edb90 | 729 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
730 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
731 | (elfcpp::SHF_ALLOC | |
732 | | elfcpp::SHF_EXECINSTR), | |
733 | this->plt_); | |
a3ad94ed ILT |
734 | } |
735 | ||
736 | this->plt_->add_entry(gsym); | |
737 | } | |
738 | ||
edfbb029 CC |
739 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
740 | ||
741 | void | |
742 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
743 | { | |
744 | if (this->tls_base_symbol_defined_) | |
745 | return; | |
746 | ||
747 | Output_segment* tls_segment = layout->tls_segment(); | |
748 | if (tls_segment != NULL) | |
749 | { | |
183fd0e3 | 750 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
751 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
752 | tls_segment, 0, 0, | |
753 | elfcpp::STT_TLS, | |
754 | elfcpp::STB_LOCAL, | |
755 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
756 | (is_exec |
757 | ? Symbol::SEGMENT_END | |
758 | : Symbol::SEGMENT_START), | |
759 | true); | |
edfbb029 CC |
760 | } |
761 | this->tls_base_symbol_defined_ = true; | |
762 | } | |
763 | ||
94c4710f ILT |
764 | // Create a GOT entry for the TLS module index. |
765 | ||
766 | unsigned int | |
767 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
768 | Sized_relobj<32, false>* object) | |
769 | { | |
770 | if (this->got_mod_index_offset_ == -1U) | |
771 | { | |
772 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
773 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
774 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
775 | unsigned int got_offset = got->add_constant(0); | |
776 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
777 | got_offset); | |
009a67a2 | 778 | got->add_constant(0); |
94c4710f ILT |
779 | this->got_mod_index_offset_ = got_offset; |
780 | } | |
781 | return this->got_mod_index_offset_; | |
782 | } | |
783 | ||
92e059d8 | 784 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
785 | // symbol. IS_FINAL is true if the final address of this symbol is |
786 | // known at link time. | |
92e059d8 | 787 | |
af6359d5 | 788 | tls::Tls_optimization |
7e1edb90 | 789 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
790 | { |
791 | // If we are generating a shared library, then we can't do anything | |
792 | // in the linker. | |
8851ecca | 793 | if (parameters->options().shared()) |
af6359d5 | 794 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
795 | |
796 | switch (r_type) | |
797 | { | |
798 | case elfcpp::R_386_TLS_GD: | |
799 | case elfcpp::R_386_TLS_GOTDESC: | |
800 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 801 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
802 | // access. Since we know that we are generating an executable, |
803 | // we can convert this to Initial-Exec. If we also know that | |
804 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 805 | if (is_final) |
af6359d5 ILT |
806 | return tls::TLSOPT_TO_LE; |
807 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
808 | |
809 | case elfcpp::R_386_TLS_LDM: | |
810 | // This is Local-Dynamic, which refers to a local symbol in the | |
811 | // dynamic TLS block. Since we know that we generating an | |
812 | // executable, we can switch to Local-Exec. | |
af6359d5 | 813 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
814 | |
815 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
816 | // Another type of Local-Dynamic relocation. |
817 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
818 | |
819 | case elfcpp::R_386_TLS_IE: | |
820 | case elfcpp::R_386_TLS_GOTIE: | |
821 | case elfcpp::R_386_TLS_IE_32: | |
822 | // These are Initial-Exec relocs which get the thread offset | |
823 | // from the GOT. If we know that we are linking against the | |
824 | // local symbol, we can switch to Local-Exec, which links the | |
825 | // thread offset into the instruction. | |
a3ad94ed | 826 | if (is_final) |
af6359d5 ILT |
827 | return tls::TLSOPT_TO_LE; |
828 | return tls::TLSOPT_NONE; | |
8462ae85 | 829 | |
92e059d8 ILT |
830 | case elfcpp::R_386_TLS_LE: |
831 | case elfcpp::R_386_TLS_LE_32: | |
832 | // When we already have Local-Exec, there is nothing further we | |
833 | // can do. | |
af6359d5 | 834 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
835 | |
836 | default: | |
a3ad94ed | 837 | gold_unreachable(); |
92e059d8 ILT |
838 | } |
839 | } | |
840 | ||
af6359d5 ILT |
841 | // Report an unsupported relocation against a local symbol. |
842 | ||
843 | void | |
844 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
845 | unsigned int r_type) | |
846 | { | |
75f2446e ILT |
847 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
848 | object->name().c_str(), r_type); | |
af6359d5 ILT |
849 | } |
850 | ||
92e059d8 ILT |
851 | // Scan a relocation for a local symbol. |
852 | ||
853 | inline void | |
7e1edb90 | 854 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
855 | Symbol_table* symtab, |
856 | Layout* layout, | |
857 | Target_i386* target, | |
f6ce93d6 | 858 | Sized_relobj<32, false>* object, |
1b64748b | 859 | unsigned int data_shndx, |
07f397ab | 860 | Output_section* output_section, |
1b64748b | 861 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 862 | unsigned int r_type, |
7bf1f802 | 863 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
864 | { |
865 | switch (r_type) | |
866 | { | |
867 | case elfcpp::R_386_NONE: | |
868 | case elfcpp::R_386_GNU_VTINHERIT: | |
869 | case elfcpp::R_386_GNU_VTENTRY: | |
870 | break; | |
871 | ||
872 | case elfcpp::R_386_32: | |
436ca963 ILT |
873 | // If building a shared library (or a position-independent |
874 | // executable), we need to create a dynamic relocation for | |
875 | // this location. The relocation applied at link time will | |
876 | // apply the link-time value, so we flag the location with | |
877 | // an R_386_RELATIVE relocation so the dynamic loader can | |
878 | // relocate it easily. | |
8851ecca | 879 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
880 | { |
881 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
882 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
883 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
884 | output_section, data_shndx, | |
885 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
886 | } |
887 | break; | |
888 | ||
889 | case elfcpp::R_386_16: | |
890 | case elfcpp::R_386_8: | |
891 | // If building a shared library (or a position-independent | |
892 | // executable), we need to create a dynamic relocation for | |
893 | // this location. Because the addend needs to remain in the | |
894 | // data section, we need to be careful not to apply this | |
895 | // relocation statically. | |
8851ecca | 896 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
897 | { |
898 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 899 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 900 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
901 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
902 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
903 | else |
904 | { | |
905 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
906 | unsigned int shndx = lsym.get_st_shndx(); |
907 | bool is_ordinary; | |
908 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
909 | &is_ordinary); | |
910 | if (!is_ordinary) | |
911 | object->error(_("section symbol %u has bad shndx %u"), | |
912 | r_sym, shndx); | |
913 | else | |
914 | rel_dyn->add_local_section(object, shndx, | |
915 | r_type, output_section, | |
916 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 917 | } |
436ca963 | 918 | } |
92e059d8 ILT |
919 | break; |
920 | ||
921 | case elfcpp::R_386_PC32: | |
922 | case elfcpp::R_386_PC16: | |
923 | case elfcpp::R_386_PC8: | |
924 | break; | |
925 | ||
df2efe71 ILT |
926 | case elfcpp::R_386_PLT32: |
927 | // Since we know this is a local symbol, we can handle this as a | |
928 | // PC32 reloc. | |
929 | break; | |
930 | ||
ead1e424 ILT |
931 | case elfcpp::R_386_GOTOFF: |
932 | case elfcpp::R_386_GOTPC: | |
933 | // We need a GOT section. | |
7e1edb90 | 934 | target->got_section(symtab, layout); |
ead1e424 ILT |
935 | break; |
936 | ||
1b64748b ILT |
937 | case elfcpp::R_386_GOT32: |
938 | { | |
939 | // The symbol requires a GOT entry. | |
940 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
941 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 942 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
943 | { |
944 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 945 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 946 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
947 | { |
948 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 949 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
950 | rel_dyn->add_local_relative( |
951 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
952 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
953 | } |
954 | } | |
955 | } | |
956 | break; | |
957 | ||
af6359d5 ILT |
958 | // These are relocations which should only be seen by the |
959 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
960 | case elfcpp::R_386_COPY: |
961 | case elfcpp::R_386_GLOB_DAT: | |
962 | case elfcpp::R_386_JUMP_SLOT: | |
963 | case elfcpp::R_386_RELATIVE: | |
964 | case elfcpp::R_386_TLS_TPOFF: | |
965 | case elfcpp::R_386_TLS_DTPMOD32: | |
966 | case elfcpp::R_386_TLS_DTPOFF32: | |
967 | case elfcpp::R_386_TLS_TPOFF32: | |
968 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 969 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 970 | object->name().c_str(), r_type); |
92e059d8 ILT |
971 | break; |
972 | ||
af6359d5 | 973 | // These are initial TLS relocs, which are expected when |
d61c17ea | 974 | // linking. |
56622147 ILT |
975 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
976 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
977 | case elfcpp::R_386_TLS_DESC_CALL: | |
978 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
979 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
980 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 981 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
982 | case elfcpp::R_386_TLS_GOTIE: |
983 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 984 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 985 | { |
8851ecca | 986 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
987 | const tls::Tls_optimization optimized_type |
988 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
989 | switch (r_type) |
990 | { | |
56622147 | 991 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
992 | if (optimized_type == tls::TLSOPT_NONE) |
993 | { | |
994 | // Create a pair of GOT entries for the module index and | |
995 | // dtv-relative offset. | |
996 | Output_data_got<32, false>* got | |
997 | = target->got_section(symtab, layout); | |
998 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
999 | unsigned int shndx = lsym.get_st_shndx(); |
1000 | bool is_ordinary; | |
1001 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1002 | if (!is_ordinary) | |
1003 | object->error(_("local symbol %u has bad shndx %u"), | |
1004 | r_sym, shndx); | |
1005 | else | |
1006 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1007 | GOT_TYPE_TLS_PAIR, | |
1008 | target->rel_dyn_section(layout), | |
1009 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1010 | } |
1011 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1012 | unsupported_reloc_local(object, r_type); | |
1013 | break; | |
1014 | ||
56622147 | 1015 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1016 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1017 | if (optimized_type == tls::TLSOPT_NONE) |
1018 | { | |
1019 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1020 | Output_data_got<32, false>* got | |
1021 | = target->got_section(symtab, layout); | |
1022 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1023 | unsigned int shndx = lsym.get_st_shndx(); |
1024 | bool is_ordinary; | |
1025 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1026 | if (!is_ordinary) | |
1027 | object->error(_("local symbol %u has bad shndx %u"), | |
1028 | r_sym, shndx); | |
1029 | else | |
1030 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1031 | GOT_TYPE_TLS_DESC, | |
1032 | target->rel_dyn_section(layout), | |
1033 | elfcpp::R_386_TLS_DESC, 0); | |
c2b45e22 CC |
1034 | } |
1035 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1036 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1037 | break; |
1038 | ||
c2b45e22 CC |
1039 | case elfcpp::R_386_TLS_DESC_CALL: |
1040 | break; | |
1041 | ||
56622147 | 1042 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1043 | if (optimized_type == tls::TLSOPT_NONE) |
1044 | { | |
1045 | // Create a GOT entry for the module index. | |
94c4710f | 1046 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1047 | } |
1048 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1049 | unsupported_reloc_local(object, r_type); |
1050 | break; | |
1051 | ||
56622147 | 1052 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1053 | break; |
1054 | ||
56622147 ILT |
1055 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1056 | case elfcpp::R_386_TLS_IE_32: | |
1057 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1058 | layout->set_has_static_tls(); |
07f397ab ILT |
1059 | if (optimized_type == tls::TLSOPT_NONE) |
1060 | { | |
7bf1f802 ILT |
1061 | // For the R_386_TLS_IE relocation, we need to create a |
1062 | // dynamic relocation when building a shared library. | |
1063 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1064 | && parameters->options().shared()) |
7bf1f802 ILT |
1065 | { |
1066 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1067 | unsigned int r_sym |
1068 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1069 | rel_dyn->add_local_relative(object, r_sym, | |
1070 | elfcpp::R_386_RELATIVE, | |
1071 | output_section, data_shndx, | |
1072 | reloc.get_r_offset()); | |
7bf1f802 | 1073 | } |
07f397ab ILT |
1074 | // Create a GOT entry for the tp-relative offset. |
1075 | Output_data_got<32, false>* got | |
1076 | = target->got_section(symtab, layout); | |
1077 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1078 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1079 | ? elfcpp::R_386_TLS_TPOFF32 | |
1080 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1081 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1082 | ? GOT_TYPE_TLS_OFFSET | |
1083 | : GOT_TYPE_TLS_NOFFSET); | |
1084 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1085 | target->rel_dyn_section(layout), |
1086 | dyn_r_type); | |
07f397ab ILT |
1087 | } |
1088 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1089 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1090 | break; |
af6359d5 | 1091 | |
56622147 ILT |
1092 | case elfcpp::R_386_TLS_LE: // Local-exec |
1093 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1094 | layout->set_has_static_tls(); |
07f397ab | 1095 | if (output_is_shared) |
7bf1f802 ILT |
1096 | { |
1097 | // We need to create a dynamic relocation. | |
dceae3c1 | 1098 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1099 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1100 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1101 | ? elfcpp::R_386_TLS_TPOFF32 | |
1102 | : elfcpp::R_386_TLS_TPOFF); | |
1103 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1104 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1105 | data_shndx, reloc.get_r_offset()); | |
1106 | } | |
56622147 ILT |
1107 | break; |
1108 | ||
af6359d5 ILT |
1109 | default: |
1110 | gold_unreachable(); | |
7e1edb90 ILT |
1111 | } |
1112 | } | |
92e059d8 ILT |
1113 | break; |
1114 | ||
92e059d8 ILT |
1115 | case elfcpp::R_386_32PLT: |
1116 | case elfcpp::R_386_TLS_GD_32: | |
1117 | case elfcpp::R_386_TLS_GD_PUSH: | |
1118 | case elfcpp::R_386_TLS_GD_CALL: | |
1119 | case elfcpp::R_386_TLS_GD_POP: | |
1120 | case elfcpp::R_386_TLS_LDM_32: | |
1121 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1122 | case elfcpp::R_386_TLS_LDM_CALL: | |
1123 | case elfcpp::R_386_TLS_LDM_POP: | |
1124 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1125 | default: | |
af6359d5 | 1126 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1127 | break; |
1128 | } | |
1129 | } | |
1130 | ||
af6359d5 ILT |
1131 | // Report an unsupported relocation against a global symbol. |
1132 | ||
1133 | void | |
1134 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1135 | unsigned int r_type, | |
1136 | Symbol* gsym) | |
1137 | { | |
75f2446e | 1138 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1139 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1140 | } |
1141 | ||
92e059d8 ILT |
1142 | // Scan a relocation for a global symbol. |
1143 | ||
1144 | inline void | |
12c0daef | 1145 | Target_i386::Scan::global(const General_options&, |
ead1e424 ILT |
1146 | Symbol_table* symtab, |
1147 | Layout* layout, | |
1148 | Target_i386* target, | |
f6ce93d6 | 1149 | Sized_relobj<32, false>* object, |
a3ad94ed | 1150 | unsigned int data_shndx, |
07f397ab | 1151 | Output_section* output_section, |
a3ad94ed ILT |
1152 | const elfcpp::Rel<32, false>& reloc, |
1153 | unsigned int r_type, | |
92e059d8 ILT |
1154 | Symbol* gsym) |
1155 | { | |
1156 | switch (r_type) | |
1157 | { | |
1158 | case elfcpp::R_386_NONE: | |
1159 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1160 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1161 | break; |
1162 | ||
1163 | case elfcpp::R_386_32: | |
92e059d8 | 1164 | case elfcpp::R_386_16: |
92e059d8 | 1165 | case elfcpp::R_386_8: |
96f2030e | 1166 | { |
d61c6bd4 ILT |
1167 | // Make a PLT entry if necessary. |
1168 | if (gsym->needs_plt_entry()) | |
1169 | { | |
1170 | target->make_plt_entry(symtab, layout, gsym); | |
1171 | // Since this is not a PC-relative relocation, we may be | |
1172 | // taking the address of a function. In that case we need to | |
1173 | // set the entry in the dynamic symbol table to the address of | |
1174 | // the PLT entry. | |
8851ecca | 1175 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1176 | gsym->set_needs_dynsym_value(); |
1177 | } | |
1178 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1179 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1180 | { |
1181 | if (target->may_need_copy_reloc(gsym)) | |
1182 | { | |
12c0daef | 1183 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1184 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1185 | } |
1186 | else if (r_type == elfcpp::R_386_32 | |
1187 | && gsym->can_use_relative_reloc(false)) | |
1188 | { | |
1189 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1190 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1191 | output_section, object, | |
1192 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1193 | } |
1194 | else | |
1195 | { | |
96f2030e | 1196 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1197 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1198 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1199 | } |
1200 | } | |
1201 | } | |
1202 | break; | |
1203 | ||
1204 | case elfcpp::R_386_PC32: | |
1205 | case elfcpp::R_386_PC16: | |
1206 | case elfcpp::R_386_PC8: | |
1207 | { | |
1208 | // Make a PLT entry if necessary. | |
1209 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1210 | { |
1211 | // These relocations are used for function calls only in | |
1212 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1213 | // we'll need a text relocation anyway, so we can skip the | |
1214 | // PLT entry and let the dynamic linker bind the call directly | |
1215 | // to the target. For smaller relocations, we should use a | |
1216 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1217 | if (!parameters->options().shared() |
7bf1f802 ILT |
1218 | || r_type != elfcpp::R_386_PC32) |
1219 | target->make_plt_entry(symtab, layout, gsym); | |
1220 | } | |
d61c6bd4 | 1221 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1222 | int flags = Symbol::NON_PIC_REF; |
1223 | if (gsym->type() == elfcpp::STT_FUNC) | |
1224 | flags |= Symbol::FUNCTION_CALL; | |
1225 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1226 | { |
d61c6bd4 ILT |
1227 | if (target->may_need_copy_reloc(gsym)) |
1228 | { | |
12c0daef | 1229 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1230 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1231 | } |
86849f1f | 1232 | else |
d61c6bd4 ILT |
1233 | { |
1234 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1235 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1236 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1237 | } |
96f2030e ILT |
1238 | } |
1239 | } | |
92e059d8 ILT |
1240 | break; |
1241 | ||
ead1e424 | 1242 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1243 | { |
1244 | // The symbol requires a GOT entry. | |
7e1edb90 | 1245 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1246 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1247 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1248 | else |
1249 | { | |
8462ae85 | 1250 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1251 | // GOT entry with a dynamic relocation. |
1252 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1253 | if (gsym->is_from_dynobj() |
1254 | || gsym->is_undefined() | |
1255 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1256 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1257 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1258 | else |
8462ae85 | 1259 | { |
0a65a3a7 CC |
1260 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1261 | rel_dyn->add_global_relative( | |
1262 | gsym, elfcpp::R_386_RELATIVE, got, | |
1263 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1264 | } |
1265 | } | |
1266 | } | |
ead1e424 ILT |
1267 | break; |
1268 | ||
1269 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1270 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1271 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1272 | if (gsym->final_value_is_known()) |
ead1e424 | 1273 | break; |
436ca963 ILT |
1274 | // If building a shared library, we can also skip the PLT entry |
1275 | // if the symbol is defined in the output file and is protected | |
1276 | // or hidden. | |
1277 | if (gsym->is_defined() | |
1278 | && !gsym->is_from_dynobj() | |
1279 | && !gsym->is_preemptible()) | |
1280 | break; | |
7e1edb90 | 1281 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1282 | break; |
1283 | ||
1284 | case elfcpp::R_386_GOTOFF: | |
1285 | case elfcpp::R_386_GOTPC: | |
1286 | // We need a GOT section. | |
7e1edb90 | 1287 | target->got_section(symtab, layout); |
ead1e424 ILT |
1288 | break; |
1289 | ||
af6359d5 ILT |
1290 | // These are relocations which should only be seen by the |
1291 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1292 | case elfcpp::R_386_COPY: |
1293 | case elfcpp::R_386_GLOB_DAT: | |
1294 | case elfcpp::R_386_JUMP_SLOT: | |
1295 | case elfcpp::R_386_RELATIVE: | |
1296 | case elfcpp::R_386_TLS_TPOFF: | |
1297 | case elfcpp::R_386_TLS_DTPMOD32: | |
1298 | case elfcpp::R_386_TLS_DTPOFF32: | |
1299 | case elfcpp::R_386_TLS_TPOFF32: | |
1300 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1301 | gold_error(_("%s: unexpected reloc %u in object file"), |
1302 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1303 | break; |
1304 | ||
d61c17ea ILT |
1305 | // These are initial tls relocs, which are expected when |
1306 | // linking. | |
56622147 ILT |
1307 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1308 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1309 | case elfcpp::R_386_TLS_DESC_CALL: | |
1310 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1311 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1312 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1313 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1314 | case elfcpp::R_386_TLS_GOTIE: |
1315 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1316 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1317 | { |
7e1edb90 | 1318 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1319 | const tls::Tls_optimization optimized_type |
1320 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1321 | switch (r_type) |
1322 | { | |
56622147 | 1323 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1324 | if (optimized_type == tls::TLSOPT_NONE) |
1325 | { | |
1326 | // Create a pair of GOT entries for the module index and | |
1327 | // dtv-relative offset. | |
1328 | Output_data_got<32, false>* got | |
1329 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1330 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1331 | target->rel_dyn_section(layout), |
1332 | elfcpp::R_386_TLS_DTPMOD32, | |
1333 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1334 | } |
1335 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1336 | { | |
1337 | // Create a GOT entry for the tp-relative offset. | |
1338 | Output_data_got<32, false>* got | |
1339 | = target->got_section(symtab, layout); | |
c2b45e22 | 1340 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1341 | target->rel_dyn_section(layout), |
c2b45e22 | 1342 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1343 | } |
1344 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1345 | unsupported_reloc_global(object, r_type, gsym); | |
1346 | break; | |
1347 | ||
56622147 | 1348 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1349 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1350 | if (optimized_type == tls::TLSOPT_NONE) |
1351 | { | |
1352 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1353 | Output_data_got<32, false>* got | |
1354 | = target->got_section(symtab, layout); | |
1355 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1356 | target->rel_dyn_section(layout), | |
1357 | elfcpp::R_386_TLS_DESC, 0); | |
1358 | } | |
1359 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1360 | { | |
1361 | // Create a GOT entry for the tp-relative offset. | |
1362 | Output_data_got<32, false>* got | |
1363 | = target->got_section(symtab, layout); | |
1364 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1365 | target->rel_dyn_section(layout), | |
1366 | elfcpp::R_386_TLS_TPOFF); | |
1367 | } | |
1368 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1369 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1370 | break; |
1371 | ||
1372 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1373 | break; |
1374 | ||
56622147 | 1375 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1376 | if (optimized_type == tls::TLSOPT_NONE) |
1377 | { | |
1378 | // Create a GOT entry for the module index. | |
94c4710f | 1379 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1380 | } |
1381 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1382 | unsupported_reloc_global(object, r_type, gsym); |
1383 | break; | |
1384 | ||
56622147 | 1385 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1386 | break; |
1387 | ||
56622147 ILT |
1388 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1389 | case elfcpp::R_386_TLS_IE_32: | |
1390 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1391 | layout->set_has_static_tls(); |
07f397ab ILT |
1392 | if (optimized_type == tls::TLSOPT_NONE) |
1393 | { | |
7bf1f802 ILT |
1394 | // For the R_386_TLS_IE relocation, we need to create a |
1395 | // dynamic relocation when building a shared library. | |
1396 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1397 | && parameters->options().shared()) |
07f397ab | 1398 | { |
07f397ab | 1399 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1400 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1401 | output_section, object, | |
1402 | data_shndx, | |
1403 | reloc.get_r_offset()); | |
07f397ab | 1404 | } |
7bf1f802 ILT |
1405 | // Create a GOT entry for the tp-relative offset. |
1406 | Output_data_got<32, false>* got | |
1407 | = target->got_section(symtab, layout); | |
1408 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1409 | ? elfcpp::R_386_TLS_TPOFF32 | |
1410 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1411 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1412 | ? GOT_TYPE_TLS_OFFSET | |
1413 | : GOT_TYPE_TLS_NOFFSET); | |
1414 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1415 | target->rel_dyn_section(layout), |
1416 | dyn_r_type); | |
07f397ab ILT |
1417 | } |
1418 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1419 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1420 | break; |
af6359d5 | 1421 | |
56622147 ILT |
1422 | case elfcpp::R_386_TLS_LE: // Local-exec |
1423 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1424 | layout->set_has_static_tls(); |
8851ecca | 1425 | if (parameters->options().shared()) |
7bf1f802 ILT |
1426 | { |
1427 | // We need to create a dynamic relocation. | |
1428 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1429 | ? elfcpp::R_386_TLS_TPOFF32 | |
1430 | : elfcpp::R_386_TLS_TPOFF); | |
1431 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1432 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1433 | data_shndx, reloc.get_r_offset()); | |
1434 | } | |
56622147 ILT |
1435 | break; |
1436 | ||
af6359d5 ILT |
1437 | default: |
1438 | gold_unreachable(); | |
a3ad94ed ILT |
1439 | } |
1440 | } | |
92e059d8 ILT |
1441 | break; |
1442 | ||
92e059d8 ILT |
1443 | case elfcpp::R_386_32PLT: |
1444 | case elfcpp::R_386_TLS_GD_32: | |
1445 | case elfcpp::R_386_TLS_GD_PUSH: | |
1446 | case elfcpp::R_386_TLS_GD_CALL: | |
1447 | case elfcpp::R_386_TLS_GD_POP: | |
1448 | case elfcpp::R_386_TLS_LDM_32: | |
1449 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1450 | case elfcpp::R_386_TLS_LDM_CALL: | |
1451 | case elfcpp::R_386_TLS_LDM_POP: | |
1452 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1453 | default: | |
af6359d5 | 1454 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1455 | break; |
1456 | } | |
1457 | } | |
1458 | ||
1459 | // Scan relocations for a section. | |
1460 | ||
1461 | void | |
1462 | Target_i386::scan_relocs(const General_options& options, | |
1463 | Symbol_table* symtab, | |
ead1e424 | 1464 | Layout* layout, |
f6ce93d6 | 1465 | Sized_relobj<32, false>* object, |
a3ad94ed | 1466 | unsigned int data_shndx, |
92e059d8 ILT |
1467 | unsigned int sh_type, |
1468 | const unsigned char* prelocs, | |
1469 | size_t reloc_count, | |
730cdc88 ILT |
1470 | Output_section* output_section, |
1471 | bool needs_special_offset_handling, | |
92e059d8 | 1472 | size_t local_symbol_count, |
730cdc88 | 1473 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1474 | { |
1475 | if (sh_type == elfcpp::SHT_RELA) | |
1476 | { | |
75f2446e ILT |
1477 | gold_error(_("%s: unsupported RELA reloc section"), |
1478 | object->name().c_str()); | |
1479 | return; | |
92e059d8 ILT |
1480 | } |
1481 | ||
ead1e424 ILT |
1482 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1483 | Target_i386::Scan>( | |
92e059d8 ILT |
1484 | options, |
1485 | symtab, | |
ead1e424 ILT |
1486 | layout, |
1487 | this, | |
92e059d8 | 1488 | object, |
a3ad94ed | 1489 | data_shndx, |
92e059d8 ILT |
1490 | prelocs, |
1491 | reloc_count, | |
730cdc88 ILT |
1492 | output_section, |
1493 | needs_special_offset_handling, | |
92e059d8 | 1494 | local_symbol_count, |
730cdc88 | 1495 | plocal_symbols); |
92e059d8 ILT |
1496 | } |
1497 | ||
16649710 | 1498 | // Finalize the sections. |
5a6f7e2d ILT |
1499 | |
1500 | void | |
7e1edb90 | 1501 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1502 | { |
16649710 ILT |
1503 | // Fill in some more dynamic tags. |
1504 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1505 | if (odyn != NULL) | |
1506 | { | |
1507 | if (this->got_plt_ != NULL) | |
1508 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1509 | ||
1510 | if (this->plt_ != NULL) | |
1511 | { | |
1512 | const Output_data* od = this->plt_->rel_plt(); | |
1513 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1514 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1515 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1516 | } | |
1517 | ||
1518 | if (this->rel_dyn_ != NULL) | |
1519 | { | |
1520 | const Output_data* od = this->rel_dyn_; | |
1521 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1522 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1523 | odyn->add_constant(elfcpp::DT_RELENT, | |
1524 | elfcpp::Elf_sizes<32>::rel_size); | |
1525 | } | |
1526 | ||
8851ecca | 1527 | if (!parameters->options().shared()) |
16649710 ILT |
1528 | { |
1529 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1530 | // linker at run time, and used by the debugger. | |
1531 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1536 | // relocs. | |
12c0daef ILT |
1537 | if (this->copy_relocs_.any_saved_relocs()) |
1538 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1539 | } |
1540 | ||
86849f1f ILT |
1541 | // Return whether a direct absolute static relocation needs to be applied. |
1542 | // In cases where Scan::local() or Scan::global() has created | |
1543 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1544 | // of the relocation is carried in the data, and we must not | |
1545 | // apply the static relocation. | |
1546 | ||
1547 | inline bool | |
1548 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1549 | int ref_flags, |
86849f1f ILT |
1550 | bool is_32bit) |
1551 | { | |
d61c6bd4 ILT |
1552 | // For local symbols, we will have created a non-RELATIVE dynamic |
1553 | // relocation only if (a) the output is position independent, | |
1554 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1555 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1556 | if (gsym == NULL) |
8851ecca | 1557 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1558 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1559 | && !is_32bit); |
86849f1f | 1560 | |
0700cf32 ILT |
1561 | // For global symbols, we use the same helper routines used in the |
1562 | // scan pass. If we did not create a dynamic relocation, or if we | |
1563 | // created a RELATIVE dynamic relocation, we should apply the static | |
1564 | // relocation. | |
1565 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1566 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1567 | && gsym->can_use_relative_reloc(ref_flags | |
1568 | & Symbol::FUNCTION_CALL); | |
1569 | return !has_dyn || is_rel; | |
86849f1f ILT |
1570 | } |
1571 | ||
61ba1cf9 ILT |
1572 | // Perform a relocation. |
1573 | ||
ead1e424 | 1574 | inline bool |
92e059d8 | 1575 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1576 | Target_i386* target, |
92e059d8 ILT |
1577 | size_t relnum, |
1578 | const elfcpp::Rel<32, false>& rel, | |
1579 | unsigned int r_type, | |
c06b7b0b | 1580 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1581 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1582 | unsigned char* view, |
1583 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1584 | section_size_type view_size) |
61ba1cf9 | 1585 | { |
ead1e424 ILT |
1586 | if (this->skip_call_tls_get_addr_) |
1587 | { | |
1588 | if (r_type != elfcpp::R_386_PLT32 | |
1589 | || gsym == NULL | |
1590 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1591 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1592 | _("missing expected TLS relocation")); | |
1593 | else | |
ead1e424 | 1594 | { |
75f2446e ILT |
1595 | this->skip_call_tls_get_addr_ = false; |
1596 | return false; | |
ead1e424 | 1597 | } |
ead1e424 ILT |
1598 | } |
1599 | ||
a3ad94ed | 1600 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1601 | Symbol_value<32> symval; |
436ca963 | 1602 | if (gsym != NULL |
de4c45bd ILT |
1603 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1604 | || r_type == elfcpp::R_386_PC16 | |
1605 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1606 | { |
b8e6aad9 ILT |
1607 | symval.set_output_value(target->plt_section()->address() |
1608 | + gsym->plt_offset()); | |
1609 | psymval = &symval; | |
a3ad94ed ILT |
1610 | } |
1611 | ||
b8e6aad9 ILT |
1612 | const Sized_relobj<32, false>* object = relinfo->object; |
1613 | ||
1b64748b | 1614 | // Get the GOT offset if needed. |
96f2030e ILT |
1615 | // The GOT pointer points to the end of the GOT section. |
1616 | // We need to subtract the size of the GOT section to get | |
1617 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1618 | bool have_got_offset = false; |
1619 | unsigned int got_offset = 0; | |
1620 | switch (r_type) | |
1621 | { | |
1622 | case elfcpp::R_386_GOT32: | |
1623 | if (gsym != NULL) | |
1624 | { | |
0a65a3a7 CC |
1625 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1626 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1627 | - target->got_size()); | |
1b64748b ILT |
1628 | } |
1629 | else | |
1630 | { | |
1631 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1632 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1633 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1634 | - target->got_size()); | |
1b64748b ILT |
1635 | } |
1636 | have_got_offset = true; | |
1637 | break; | |
1638 | ||
1639 | default: | |
1640 | break; | |
1641 | } | |
1642 | ||
61ba1cf9 ILT |
1643 | switch (r_type) |
1644 | { | |
1645 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1646 | case elfcpp::R_386_GNU_VTINHERIT: |
1647 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1648 | break; |
1649 | ||
1650 | case elfcpp::R_386_32: | |
0700cf32 | 1651 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true)) |
86849f1f | 1652 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1653 | break; |
1654 | ||
1655 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1656 | { |
0700cf32 ILT |
1657 | int ref_flags = Symbol::NON_PIC_REF; |
1658 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1659 | ref_flags |= Symbol::FUNCTION_CALL; | |
1660 | if (should_apply_static_reloc(gsym, ref_flags, true)) | |
d61c6bd4 ILT |
1661 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1662 | } | |
92e059d8 ILT |
1663 | break; |
1664 | ||
1665 | case elfcpp::R_386_16: | |
0700cf32 | 1666 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1667 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1668 | break; |
1669 | ||
1670 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1671 | { |
0700cf32 ILT |
1672 | int ref_flags = Symbol::NON_PIC_REF; |
1673 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1674 | ref_flags |= Symbol::FUNCTION_CALL; | |
1675 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d09e9154 | 1676 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1677 | } |
61ba1cf9 ILT |
1678 | break; |
1679 | ||
92e059d8 | 1680 | case elfcpp::R_386_8: |
0700cf32 | 1681 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false)) |
86849f1f | 1682 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1683 | break; |
1684 | ||
1685 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1686 | { |
0700cf32 ILT |
1687 | int ref_flags = Symbol::NON_PIC_REF; |
1688 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1689 | ref_flags |= Symbol::FUNCTION_CALL; | |
1690 | if (should_apply_static_reloc(gsym, ref_flags, false)) | |
d09e9154 | 1691 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1692 | } |
92e059d8 ILT |
1693 | break; |
1694 | ||
ead1e424 | 1695 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1696 | gold_assert(gsym == NULL |
1697 | || gsym->has_plt_offset() | |
99f8faca ILT |
1698 | || gsym->final_value_is_known() |
1699 | || (gsym->is_defined() | |
1700 | && !gsym->is_from_dynobj() | |
1701 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1702 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1703 | break; |
1704 | ||
1705 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1706 | gold_assert(have_got_offset); |
1707 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1708 | break; |
1709 | ||
1710 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1711 | { |
1712 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1713 | value = (psymval->value(object, 0) | |
96f2030e | 1714 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1715 | Relocate_functions<32, false>::rel32(view, value); |
1716 | } | |
ead1e424 ILT |
1717 | break; |
1718 | ||
1719 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1720 | { |
1721 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1722 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1723 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1724 | } | |
ead1e424 ILT |
1725 | break; |
1726 | ||
92e059d8 ILT |
1727 | case elfcpp::R_386_COPY: |
1728 | case elfcpp::R_386_GLOB_DAT: | |
1729 | case elfcpp::R_386_JUMP_SLOT: | |
1730 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1731 | // These are outstanding tls relocs, which are unexpected when |
1732 | // linking. | |
92e059d8 ILT |
1733 | case elfcpp::R_386_TLS_TPOFF: |
1734 | case elfcpp::R_386_TLS_DTPMOD32: | |
1735 | case elfcpp::R_386_TLS_DTPOFF32: | |
1736 | case elfcpp::R_386_TLS_TPOFF32: | |
1737 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1738 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1739 | _("unexpected reloc %u in object file"), | |
1740 | r_type); | |
92e059d8 ILT |
1741 | break; |
1742 | ||
d61c17ea ILT |
1743 | // These are initial tls relocs, which are expected when |
1744 | // linking. | |
56622147 ILT |
1745 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1746 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1747 | case elfcpp::R_386_TLS_DESC_CALL: | |
1748 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1749 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1750 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1751 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1752 | case elfcpp::R_386_TLS_GOTIE: |
1753 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1754 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1755 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1756 | view, address, view_size); | |
92e059d8 ILT |
1757 | break; |
1758 | ||
92e059d8 ILT |
1759 | case elfcpp::R_386_32PLT: |
1760 | case elfcpp::R_386_TLS_GD_32: | |
1761 | case elfcpp::R_386_TLS_GD_PUSH: | |
1762 | case elfcpp::R_386_TLS_GD_CALL: | |
1763 | case elfcpp::R_386_TLS_GD_POP: | |
1764 | case elfcpp::R_386_TLS_LDM_32: | |
1765 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1766 | case elfcpp::R_386_TLS_LDM_CALL: | |
1767 | case elfcpp::R_386_TLS_LDM_POP: | |
1768 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1769 | default: |
75f2446e ILT |
1770 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1771 | _("unsupported reloc %u"), | |
1772 | r_type); | |
92e059d8 ILT |
1773 | break; |
1774 | } | |
ead1e424 ILT |
1775 | |
1776 | return true; | |
92e059d8 ILT |
1777 | } |
1778 | ||
1779 | // Perform a TLS relocation. | |
1780 | ||
1781 | inline void | |
1782 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1783 | Target_i386* target, |
92e059d8 ILT |
1784 | size_t relnum, |
1785 | const elfcpp::Rel<32, false>& rel, | |
1786 | unsigned int r_type, | |
c06b7b0b | 1787 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1788 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1789 | unsigned char* view, |
1790 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1791 | section_size_type view_size) |
92e059d8 ILT |
1792 | { |
1793 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1794 | |
07f397ab ILT |
1795 | const Sized_relobj<32, false>* object = relinfo->object; |
1796 | ||
1797 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1798 | |
8851ecca ILT |
1799 | const bool is_final = |
1800 | (gsym == NULL | |
1801 | ? !parameters->options().output_is_position_independent() | |
1802 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1803 | const tls::Tls_optimization optimized_type |
1804 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1805 | switch (r_type) |
1806 | { | |
56622147 | 1807 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1808 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1809 | { |
07f397ab | 1810 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1811 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1812 | rel, r_type, value, view, | |
1813 | view_size); | |
92e059d8 ILT |
1814 | break; |
1815 | } | |
07f397ab ILT |
1816 | else |
1817 | { | |
c2b45e22 CC |
1818 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1819 | ? GOT_TYPE_TLS_NOFFSET | |
1820 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1821 | unsigned int got_offset; |
1822 | if (gsym != NULL) | |
1823 | { | |
c2b45e22 CC |
1824 | gold_assert(gsym->has_got_offset(got_type)); |
1825 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1826 | } |
1827 | else | |
1828 | { | |
1829 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1830 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1831 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1832 | - target->got_size()); |
1833 | } | |
1834 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1835 | { | |
1836 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1837 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1838 | got_offset, view, view_size); | |
07f397ab ILT |
1839 | break; |
1840 | } | |
1841 | else if (optimized_type == tls::TLSOPT_NONE) | |
1842 | { | |
1843 | // Relocate the field with the offset of the pair of GOT | |
1844 | // entries. | |
1845 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1846 | break; | |
1847 | } | |
1848 | } | |
75f2446e ILT |
1849 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1850 | _("unsupported reloc %u"), | |
1851 | r_type); | |
92e059d8 ILT |
1852 | break; |
1853 | ||
56622147 ILT |
1854 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1855 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 1856 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1857 | if (optimized_type == tls::TLSOPT_TO_LE) |
1858 | { | |
1859 | gold_assert(tls_segment != NULL); | |
1860 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1861 | rel, r_type, value, view, | |
1862 | view_size); | |
1863 | break; | |
1864 | } | |
1865 | else | |
1866 | { | |
1867 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1868 | ? GOT_TYPE_TLS_NOFFSET | |
1869 | : GOT_TYPE_TLS_DESC); | |
1870 | unsigned int got_offset; | |
1871 | if (gsym != NULL) | |
1872 | { | |
1873 | gold_assert(gsym->has_got_offset(got_type)); | |
1874 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1875 | } | |
1876 | else | |
1877 | { | |
1878 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1879 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1880 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1881 | - target->got_size()); | |
1882 | } | |
1883 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1884 | { | |
1885 | gold_assert(tls_segment != NULL); | |
1886 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1887 | got_offset, view, view_size); | |
1888 | break; | |
1889 | } | |
1890 | else if (optimized_type == tls::TLSOPT_NONE) | |
1891 | { | |
1892 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1893 | { | |
1894 | // Relocate the field with the offset of the pair of GOT | |
1895 | // entries. | |
1896 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1897 | } | |
1898 | break; | |
1899 | } | |
1900 | } | |
75f2446e ILT |
1901 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1902 | _("unsupported reloc %u"), | |
1903 | r_type); | |
ead1e424 ILT |
1904 | break; |
1905 | ||
56622147 | 1906 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1907 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1908 | { | |
75f2446e ILT |
1909 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1910 | _("both SUN and GNU model " | |
1911 | "TLS relocations")); | |
1912 | break; | |
46cf9fa2 ILT |
1913 | } |
1914 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1915 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1916 | { |
07f397ab | 1917 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1918 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1919 | value, view, view_size); | |
1920 | break; | |
1921 | } | |
07f397ab ILT |
1922 | else if (optimized_type == tls::TLSOPT_NONE) |
1923 | { | |
1924 | // Relocate the field with the offset of the GOT entry for | |
1925 | // the module index. | |
1926 | unsigned int got_offset; | |
94c4710f ILT |
1927 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1928 | - target->got_size()); | |
07f397ab ILT |
1929 | Relocate_functions<32, false>::rel32(view, got_offset); |
1930 | break; | |
1931 | } | |
75f2446e ILT |
1932 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1933 | _("unsupported reloc %u"), | |
1934 | r_type); | |
46cf9fa2 ILT |
1935 | break; |
1936 | ||
56622147 | 1937 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1938 | // This reloc can appear in debugging sections, in which case we |
1939 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
1940 | // tells us this. | |
497897f9 ILT |
1941 | if (optimized_type == tls::TLSOPT_TO_LE |
1942 | && this->local_dynamic_type_ != LOCAL_DYNAMIC_NONE) | |
94c4710f ILT |
1943 | { |
1944 | gold_assert(tls_segment != NULL); | |
1945 | value -= tls_segment->memsz(); | |
1946 | } | |
46cf9fa2 ILT |
1947 | Relocate_functions<32, false>::rel32(view, value); |
1948 | break; | |
1949 | ||
56622147 ILT |
1950 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1951 | case elfcpp::R_386_TLS_GOTIE: | |
1952 | case elfcpp::R_386_TLS_IE_32: | |
1953 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1954 | { | |
07f397ab | 1955 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1956 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1957 | rel, r_type, value, view, | |
1958 | view_size); | |
1959 | break; | |
1960 | } | |
07f397ab ILT |
1961 | else if (optimized_type == tls::TLSOPT_NONE) |
1962 | { | |
1963 | // Relocate the field with the offset of the GOT entry for | |
1964 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
1965 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1966 | ? GOT_TYPE_TLS_OFFSET | |
1967 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
1968 | unsigned int got_offset; |
1969 | if (gsym != NULL) | |
1970 | { | |
c2b45e22 CC |
1971 | gold_assert(gsym->has_got_offset(got_type)); |
1972 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
1973 | } |
1974 | else | |
1975 | { | |
1976 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1977 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1978 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
1979 | } |
1980 | // For the R_386_TLS_IE relocation, we need to apply the | |
1981 | // absolute address of the GOT entry. | |
1982 | if (r_type == elfcpp::R_386_TLS_IE) | |
1983 | got_offset += target->got_plt_section()->address(); | |
1984 | // All GOT offsets are relative to the end of the GOT. | |
1985 | got_offset -= target->got_size(); | |
1986 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1987 | break; | |
1988 | } | |
75f2446e ILT |
1989 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1990 | _("unsupported reloc %u"), | |
1991 | r_type); | |
92e059d8 | 1992 | break; |
92e059d8 | 1993 | |
56622147 | 1994 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
1995 | // If we're creating a shared library, a dynamic relocation will |
1996 | // have been created for this location, so do not apply it now. | |
8851ecca | 1997 | if (!parameters->options().shared()) |
7bf1f802 ILT |
1998 | { |
1999 | gold_assert(tls_segment != NULL); | |
2000 | value -= tls_segment->memsz(); | |
2001 | Relocate_functions<32, false>::rel32(view, value); | |
2002 | } | |
56622147 | 2003 | break; |
92e059d8 | 2004 | |
56622147 | 2005 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2006 | // If we're creating a shared library, a dynamic relocation will |
2007 | // have been created for this location, so do not apply it now. | |
8851ecca | 2008 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2009 | { |
2010 | gold_assert(tls_segment != NULL); | |
2011 | value = tls_segment->memsz() - value; | |
2012 | Relocate_functions<32, false>::rel32(view, value); | |
2013 | } | |
56622147 | 2014 | break; |
92e059d8 | 2015 | } |
92e059d8 ILT |
2016 | } |
2017 | ||
e041f13d | 2018 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2019 | // Local-Exec. |
2020 | ||
2021 | inline void | |
2022 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2023 | size_t relnum, | |
2024 | Output_segment* tls_segment, | |
2025 | const elfcpp::Rel<32, false>& rel, | |
2026 | unsigned int, | |
2027 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2028 | unsigned char* view, | |
fe8718a4 | 2029 | section_size_type view_size) |
ead1e424 ILT |
2030 | { |
2031 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2032 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2033 | // leal foo(%reg),%eax; call ___tls_get_addr |
2034 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2035 | ||
af6359d5 ILT |
2036 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2037 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2038 | |
2039 | unsigned char op1 = view[-1]; | |
2040 | unsigned char op2 = view[-2]; | |
2041 | ||
af6359d5 ILT |
2042 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2043 | op2 == 0x8d || op2 == 0x04); | |
2044 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2045 | |
2046 | int roff = 5; | |
2047 | ||
2048 | if (op2 == 0x04) | |
2049 | { | |
af6359d5 ILT |
2050 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2051 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2052 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2053 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2054 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2055 | } | |
2056 | else | |
2057 | { | |
af6359d5 ILT |
2058 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2059 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2060 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2061 | && view[9] == 0x90) |
ead1e424 ILT |
2062 | { |
2063 | // There is a trailing nop. Use the size byte subl. | |
2064 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2065 | roff = 6; | |
2066 | } | |
2067 | else | |
2068 | { | |
2069 | // Use the five byte subl. | |
2070 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2071 | } | |
2072 | } | |
2073 | ||
7bf1f802 | 2074 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2075 | Relocate_functions<32, false>::rel32(view + roff, value); |
2076 | ||
2077 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2078 | // We can skip it. | |
2079 | this->skip_call_tls_get_addr_ = true; | |
2080 | } | |
2081 | ||
7bf1f802 | 2082 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2083 | // Initial-Exec. |
2084 | ||
2085 | inline void | |
2086 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2087 | size_t relnum, | |
c2b45e22 | 2088 | Output_segment*, |
07f397ab ILT |
2089 | const elfcpp::Rel<32, false>& rel, |
2090 | unsigned int, | |
2091 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2092 | unsigned char* view, | |
fe8718a4 | 2093 | section_size_type view_size) |
07f397ab ILT |
2094 | { |
2095 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2096 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2097 | ||
2098 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2099 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2100 | ||
2101 | unsigned char op1 = view[-1]; | |
2102 | unsigned char op2 = view[-2]; | |
2103 | ||
2104 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2105 | op2 == 0x8d || op2 == 0x04); | |
2106 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2107 | ||
2108 | int roff = 5; | |
2109 | ||
c2b45e22 CC |
2110 | // FIXME: For now, support only the first (SIB) form. |
2111 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2112 | |
2113 | if (op2 == 0x04) | |
2114 | { | |
2115 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2116 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2117 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2118 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2119 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2120 | } | |
2121 | else | |
2122 | { | |
2123 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2124 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2125 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2126 | && view[9] == 0x90) |
2127 | { | |
2128 | // FIXME: This is not the right instruction sequence. | |
2129 | // There is a trailing nop. Use the size byte subl. | |
2130 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2131 | roff = 6; | |
2132 | } | |
2133 | else | |
2134 | { | |
2135 | // FIXME: This is not the right instruction sequence. | |
2136 | // Use the five byte subl. | |
2137 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2138 | } | |
2139 | } | |
2140 | ||
07f397ab ILT |
2141 | Relocate_functions<32, false>::rel32(view + roff, value); |
2142 | ||
2143 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2144 | // We can skip it. | |
2145 | this->skip_call_tls_get_addr_ = true; | |
2146 | } | |
2147 | ||
c2b45e22 CC |
2148 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2149 | // General-Dynamic to a Local-Exec. | |
2150 | ||
2151 | inline void | |
2152 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2153 | const Relocate_info<32, false>* relinfo, | |
2154 | size_t relnum, | |
2155 | Output_segment* tls_segment, | |
2156 | const elfcpp::Rel<32, false>& rel, | |
2157 | unsigned int r_type, | |
2158 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2159 | unsigned char* view, | |
2160 | section_size_type view_size) | |
2161 | { | |
2162 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2163 | { | |
2164 | // leal foo@TLSDESC(%ebx), %eax | |
2165 | // ==> leal foo@NTPOFF, %eax | |
2166 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2167 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2168 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2169 | view[-2] == 0x8d && view[-1] == 0x83); | |
2170 | view[-1] = 0x05; | |
2171 | value -= tls_segment->memsz(); | |
2172 | Relocate_functions<32, false>::rel32(view, value); | |
2173 | } | |
2174 | else | |
2175 | { | |
2176 | // call *foo@TLSCALL(%eax) | |
2177 | // ==> nop; nop | |
2178 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2179 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2180 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2181 | view[0] == 0xff && view[1] == 0x10); | |
2182 | view[0] = 0x66; | |
2183 | view[1] = 0x90; | |
2184 | } | |
2185 | } | |
2186 | ||
2187 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2188 | // General-Dynamic to an Initial-Exec. | |
2189 | ||
2190 | inline void | |
2191 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2192 | const Relocate_info<32, false>* relinfo, | |
2193 | size_t relnum, | |
2194 | Output_segment*, | |
2195 | const elfcpp::Rel<32, false>& rel, | |
2196 | unsigned int r_type, | |
2197 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2198 | unsigned char* view, | |
2199 | section_size_type view_size) | |
2200 | { | |
2201 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2202 | { | |
2203 | // leal foo@TLSDESC(%ebx), %eax | |
2204 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2205 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2206 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2207 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2208 | view[-2] == 0x8d && view[-1] == 0x83); | |
2209 | view[-2] = 0x8b; | |
2210 | Relocate_functions<32, false>::rel32(view, value); | |
2211 | } | |
2212 | else | |
2213 | { | |
2214 | // call *foo@TLSCALL(%eax) | |
2215 | // ==> nop; nop | |
2216 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2217 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2218 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2219 | view[0] == 0xff && view[1] == 0x10); | |
2220 | view[0] = 0x66; | |
2221 | view[1] = 0x90; | |
2222 | } | |
2223 | } | |
2224 | ||
46cf9fa2 ILT |
2225 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2226 | // Local-Exec. | |
2227 | ||
2228 | inline void | |
2229 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2230 | size_t relnum, | |
2231 | Output_segment*, | |
2232 | const elfcpp::Rel<32, false>& rel, | |
2233 | unsigned int, | |
2234 | elfcpp::Elf_types<32>::Elf_Addr, | |
2235 | unsigned char* view, | |
fe8718a4 | 2236 | section_size_type view_size) |
46cf9fa2 ILT |
2237 | { |
2238 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2239 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2240 | ||
af6359d5 ILT |
2241 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2242 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2243 | |
2244 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2245 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2246 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2247 | |
af6359d5 | 2248 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2249 | |
2250 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2251 | ||
2252 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2253 | // We can skip it. | |
2254 | this->skip_call_tls_get_addr_ = true; | |
2255 | } | |
2256 | ||
56622147 ILT |
2257 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2258 | // Local-Exec. | |
2259 | ||
2260 | inline void | |
2261 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2262 | size_t relnum, | |
2263 | Output_segment* tls_segment, | |
2264 | const elfcpp::Rel<32, false>& rel, | |
2265 | unsigned int r_type, | |
2266 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2267 | unsigned char* view, | |
fe8718a4 | 2268 | section_size_type view_size) |
56622147 ILT |
2269 | { |
2270 | // We have to actually change the instructions, which means that we | |
2271 | // need to examine the opcodes to figure out which instruction we | |
2272 | // are looking at. | |
2273 | if (r_type == elfcpp::R_386_TLS_IE) | |
2274 | { | |
2275 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2276 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2277 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2278 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2279 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2280 | ||
2281 | unsigned char op1 = view[-1]; | |
2282 | if (op1 == 0xa1) | |
2283 | { | |
2284 | // movl XX,%eax ==> movl $YY,%eax | |
2285 | view[-1] = 0xb8; | |
2286 | } | |
2287 | else | |
2288 | { | |
2289 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2290 | ||
2291 | unsigned char op2 = view[-2]; | |
2292 | if (op2 == 0x8b) | |
2293 | { | |
2294 | // movl XX,%reg ==> movl $YY,%reg | |
2295 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2296 | (op1 & 0xc7) == 0x05); | |
2297 | view[-2] = 0xc7; | |
2298 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2299 | } | |
2300 | else if (op2 == 0x03) | |
2301 | { | |
2302 | // addl XX,%reg ==> addl $YY,%reg | |
2303 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2304 | (op1 & 0xc7) == 0x05); | |
2305 | view[-2] = 0x81; | |
2306 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2307 | } | |
2308 | else | |
2309 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2310 | } | |
2311 | } | |
2312 | else | |
2313 | { | |
2314 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2315 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2316 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2317 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2318 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2319 | ||
2320 | unsigned char op1 = view[-1]; | |
2321 | unsigned char op2 = view[-2]; | |
2322 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2323 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2324 | if (op2 == 0x8b) | |
2325 | { | |
2326 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2327 | view[-2] = 0xc7; | |
2328 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2329 | } | |
2330 | else if (op2 == 0x2b) | |
2331 | { | |
2332 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2333 | view[-2] = 0x81; | |
2334 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2335 | } | |
2336 | else if (op2 == 0x03) | |
2337 | { | |
2338 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2339 | view[-2] = 0x81; | |
2340 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2341 | } | |
2342 | else | |
2343 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2344 | } | |
2345 | ||
7bf1f802 | 2346 | value = tls_segment->memsz() - value; |
56622147 ILT |
2347 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2348 | value = - value; | |
2349 | ||
2350 | Relocate_functions<32, false>::rel32(view, value); | |
2351 | } | |
2352 | ||
61ba1cf9 ILT |
2353 | // Relocate section data. |
2354 | ||
2355 | void | |
92e059d8 | 2356 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2357 | unsigned int sh_type, |
2358 | const unsigned char* prelocs, | |
2359 | size_t reloc_count, | |
730cdc88 ILT |
2360 | Output_section* output_section, |
2361 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2362 | unsigned char* view, |
2363 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2364 | section_size_type view_size) |
61ba1cf9 | 2365 | { |
a3ad94ed | 2366 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2367 | |
ead1e424 ILT |
2368 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2369 | Target_i386::Relocate>( | |
92e059d8 | 2370 | relinfo, |
ead1e424 | 2371 | this, |
61ba1cf9 ILT |
2372 | prelocs, |
2373 | reloc_count, | |
730cdc88 ILT |
2374 | output_section, |
2375 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2376 | view, |
2377 | address, | |
2378 | view_size); | |
2379 | } | |
2380 | ||
6a74a719 ILT |
2381 | // Return the size of a relocation while scanning during a relocatable |
2382 | // link. | |
2383 | ||
2384 | unsigned int | |
2385 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2386 | unsigned int r_type, | |
2387 | Relobj* object) | |
2388 | { | |
2389 | switch (r_type) | |
2390 | { | |
2391 | case elfcpp::R_386_NONE: | |
2392 | case elfcpp::R_386_GNU_VTINHERIT: | |
2393 | case elfcpp::R_386_GNU_VTENTRY: | |
2394 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2395 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2396 | case elfcpp::R_386_TLS_DESC_CALL: | |
2397 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2398 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2399 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2400 | case elfcpp::R_386_TLS_IE_32: | |
2401 | case elfcpp::R_386_TLS_GOTIE: | |
2402 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2403 | case elfcpp::R_386_TLS_LE_32: | |
2404 | return 0; | |
2405 | ||
2406 | case elfcpp::R_386_32: | |
2407 | case elfcpp::R_386_PC32: | |
2408 | case elfcpp::R_386_GOT32: | |
2409 | case elfcpp::R_386_PLT32: | |
2410 | case elfcpp::R_386_GOTOFF: | |
2411 | case elfcpp::R_386_GOTPC: | |
2412 | return 4; | |
2413 | ||
2414 | case elfcpp::R_386_16: | |
2415 | case elfcpp::R_386_PC16: | |
2416 | return 2; | |
2417 | ||
2418 | case elfcpp::R_386_8: | |
2419 | case elfcpp::R_386_PC8: | |
2420 | return 1; | |
2421 | ||
2422 | // These are relocations which should only be seen by the | |
2423 | // dynamic linker, and should never be seen here. | |
2424 | case elfcpp::R_386_COPY: | |
2425 | case elfcpp::R_386_GLOB_DAT: | |
2426 | case elfcpp::R_386_JUMP_SLOT: | |
2427 | case elfcpp::R_386_RELATIVE: | |
2428 | case elfcpp::R_386_TLS_TPOFF: | |
2429 | case elfcpp::R_386_TLS_DTPMOD32: | |
2430 | case elfcpp::R_386_TLS_DTPOFF32: | |
2431 | case elfcpp::R_386_TLS_TPOFF32: | |
2432 | case elfcpp::R_386_TLS_DESC: | |
2433 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2434 | return 0; | |
2435 | ||
2436 | case elfcpp::R_386_32PLT: | |
2437 | case elfcpp::R_386_TLS_GD_32: | |
2438 | case elfcpp::R_386_TLS_GD_PUSH: | |
2439 | case elfcpp::R_386_TLS_GD_CALL: | |
2440 | case elfcpp::R_386_TLS_GD_POP: | |
2441 | case elfcpp::R_386_TLS_LDM_32: | |
2442 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2443 | case elfcpp::R_386_TLS_LDM_CALL: | |
2444 | case elfcpp::R_386_TLS_LDM_POP: | |
2445 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2446 | default: | |
2447 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2448 | return 0; | |
2449 | } | |
2450 | } | |
2451 | ||
2452 | // Scan the relocs during a relocatable link. | |
2453 | ||
2454 | void | |
2455 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2456 | Symbol_table* symtab, | |
2457 | Layout* layout, | |
2458 | Sized_relobj<32, false>* object, | |
2459 | unsigned int data_shndx, | |
2460 | unsigned int sh_type, | |
2461 | const unsigned char* prelocs, | |
2462 | size_t reloc_count, | |
2463 | Output_section* output_section, | |
2464 | bool needs_special_offset_handling, | |
2465 | size_t local_symbol_count, | |
2466 | const unsigned char* plocal_symbols, | |
2467 | Relocatable_relocs* rr) | |
2468 | { | |
2469 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2470 | ||
2471 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2472 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2473 | ||
7019cd25 | 2474 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2475 | Scan_relocatable_relocs>( |
2476 | options, | |
2477 | symtab, | |
2478 | layout, | |
2479 | object, | |
2480 | data_shndx, | |
2481 | prelocs, | |
2482 | reloc_count, | |
2483 | output_section, | |
2484 | needs_special_offset_handling, | |
2485 | local_symbol_count, | |
2486 | plocal_symbols, | |
2487 | rr); | |
2488 | } | |
2489 | ||
2490 | // Relocate a section during a relocatable link. | |
2491 | ||
2492 | void | |
2493 | Target_i386::relocate_for_relocatable( | |
2494 | const Relocate_info<32, false>* relinfo, | |
2495 | unsigned int sh_type, | |
2496 | const unsigned char* prelocs, | |
2497 | size_t reloc_count, | |
2498 | Output_section* output_section, | |
2499 | off_t offset_in_output_section, | |
2500 | const Relocatable_relocs* rr, | |
2501 | unsigned char* view, | |
2502 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2503 | section_size_type view_size, | |
2504 | unsigned char* reloc_view, | |
2505 | section_size_type reloc_view_size) | |
2506 | { | |
2507 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2508 | ||
7019cd25 | 2509 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2510 | relinfo, |
2511 | prelocs, | |
2512 | reloc_count, | |
2513 | output_section, | |
2514 | offset_in_output_section, | |
2515 | rr, | |
2516 | view, | |
2517 | view_address, | |
2518 | view_size, | |
2519 | reloc_view, | |
2520 | reloc_view_size); | |
2521 | } | |
2522 | ||
ab5c9e90 ILT |
2523 | // Return the value to use for a dynamic which requires special |
2524 | // treatment. This is how we support equality comparisons of function | |
2525 | // pointers across shared library boundaries, as described in the | |
2526 | // processor specific ABI supplement. | |
2527 | ||
2528 | uint64_t | |
2529 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2530 | { | |
2531 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2532 | return this->plt_section()->address() + gsym->plt_offset(); | |
2533 | } | |
2534 | ||
c51e6221 ILT |
2535 | // Return a string used to fill a code section with nops to take up |
2536 | // the specified length. | |
2537 | ||
2538 | std::string | |
8851ecca | 2539 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2540 | { |
2541 | if (length >= 16) | |
2542 | { | |
2543 | // Build a jmp instruction to skip over the bytes. | |
2544 | unsigned char jmp[5]; | |
2545 | jmp[0] = 0xe9; | |
2546 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2547 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2548 | + std::string(length - 5, '\0')); | |
2549 | } | |
2550 | ||
2551 | // Nop sequences of various lengths. | |
2552 | const char nop1[1] = { 0x90 }; // nop | |
2553 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2554 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2555 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2556 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2557 | 0x00 }; // leal 0(%esi,1),%esi | |
2558 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2559 | 0x00, 0x00 }; | |
2560 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2561 | 0x00, 0x00, 0x00 }; | |
2562 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2563 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2564 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2565 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2566 | 0x00 }; | |
2567 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2568 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2569 | 0x00, 0x00 }; | |
2570 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2571 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2572 | 0x00, 0x00, 0x00 }; | |
2573 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2574 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2575 | 0x00, 0x00, 0x00, 0x00 }; | |
2576 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2577 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2578 | 0x27, 0x00, 0x00, 0x00, | |
2579 | 0x00 }; | |
2580 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2581 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2582 | 0xbc, 0x27, 0x00, 0x00, | |
2583 | 0x00, 0x00 }; | |
2584 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2585 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2586 | 0x90, 0x90, 0x90, 0x90, | |
2587 | 0x90, 0x90, 0x90 }; | |
2588 | ||
2589 | const char* nops[16] = { | |
2590 | NULL, | |
2591 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2592 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2593 | }; | |
2594 | ||
2595 | return std::string(nops[length], length); | |
2596 | } | |
2597 | ||
14bfc3f5 ILT |
2598 | // The selector for i386 object files. |
2599 | ||
2600 | class Target_selector_i386 : public Target_selector | |
2601 | { | |
2602 | public: | |
2603 | Target_selector_i386() | |
e96caa79 | 2604 | : Target_selector(elfcpp::EM_386, 32, false, "elf32-i386") |
14bfc3f5 ILT |
2605 | { } |
2606 | ||
2607 | Target* | |
e96caa79 ILT |
2608 | do_instantiate_target() |
2609 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2610 | }; |
2611 | ||
14bfc3f5 ILT |
2612 | Target_selector_i386 target_selector_i386; |
2613 | ||
2614 | } // End anonymous namespace. |