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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
a8df5856 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
14bfc3f5 ILT |
42 | |
43 | namespace | |
44 | { | |
45 | ||
46 | using namespace gold; | |
47 | ||
7223e9ca ILT |
48 | // A class to handle the PLT data. |
49 | ||
50 | class Output_data_plt_i386 : public Output_section_data | |
51 | { | |
52 | public: | |
53 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
54 | ||
55 | Output_data_plt_i386(Symbol_table*, Layout*, Output_data_space*); | |
56 | ||
57 | // Add an entry to the PLT. | |
58 | void | |
59 | add_entry(Symbol* gsym); | |
60 | ||
61 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
62 | unsigned int | |
63 | add_local_ifunc_entry(Sized_relobj<32, false>* relobj, | |
64 | unsigned int local_sym_index); | |
65 | ||
66 | // Return the .rel.plt section data. | |
67 | Reloc_section* | |
68 | rel_plt() const | |
69 | { return this->rel_; } | |
70 | ||
71 | // Return where the TLS_DESC relocations should go. | |
72 | Reloc_section* | |
73 | rel_tls_desc(Layout*); | |
74 | ||
75 | // Return the number of PLT entries. | |
76 | unsigned int | |
77 | entry_count() const | |
78 | { return this->count_; } | |
79 | ||
80 | // Return the offset of the first non-reserved PLT entry. | |
81 | static unsigned int | |
82 | first_plt_entry_offset() | |
83 | { return plt_entry_size; } | |
84 | ||
85 | // Return the size of a PLT entry. | |
86 | static unsigned int | |
87 | get_plt_entry_size() | |
88 | { return plt_entry_size; } | |
89 | ||
90 | protected: | |
91 | void | |
92 | do_adjust_output_section(Output_section* os); | |
93 | ||
94 | // Write to a map file. | |
95 | void | |
96 | do_print_to_mapfile(Mapfile* mapfile) const | |
97 | { mapfile->print_output_data(this, _("** PLT")); } | |
98 | ||
99 | private: | |
100 | // The size of an entry in the PLT. | |
101 | static const int plt_entry_size = 16; | |
102 | ||
103 | // The first entry in the PLT for an executable. | |
104 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
105 | ||
106 | // The first entry in the PLT for a shared object. | |
107 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
108 | ||
109 | // Other entries in the PLT for an executable. | |
110 | static unsigned char exec_plt_entry[plt_entry_size]; | |
111 | ||
112 | // Other entries in the PLT for a shared object. | |
113 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
114 | ||
115 | // Set the final size. | |
116 | void | |
117 | set_final_data_size() | |
118 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } | |
119 | ||
120 | // Write out the PLT data. | |
121 | void | |
122 | do_write(Output_file*); | |
123 | ||
124 | // We keep a list of global STT_GNU_IFUNC symbols, each with its | |
125 | // offset in the GOT. | |
126 | struct Global_ifunc | |
127 | { | |
128 | Symbol* sym; | |
129 | unsigned int got_offset; | |
130 | }; | |
131 | ||
132 | // We keep a list of local STT_GNU_IFUNC symbols, each with its | |
133 | // offset in the GOT. | |
134 | struct Local_ifunc | |
135 | { | |
136 | Sized_relobj<32, false>* object; | |
137 | unsigned int local_sym_index; | |
138 | unsigned int got_offset; | |
139 | }; | |
140 | ||
141 | // The reloc section. | |
142 | Reloc_section* rel_; | |
143 | // The TLS_DESC relocations, if necessary. These must follow the | |
144 | // regular PLT relocs. | |
145 | Reloc_section* tls_desc_rel_; | |
146 | // The .got.plt section. | |
147 | Output_data_space* got_plt_; | |
148 | // The number of PLT entries. | |
149 | unsigned int count_; | |
150 | // Global STT_GNU_IFUNC symbols. | |
151 | std::vector<Global_ifunc> global_ifuncs_; | |
152 | // Local STT_GNU_IFUNC symbols. | |
153 | std::vector<Local_ifunc> local_ifuncs_; | |
154 | }; | |
a3ad94ed | 155 | |
14bfc3f5 | 156 | // The i386 target class. |
e041f13d ILT |
157 | // TLS info comes from |
158 | // http://people.redhat.com/drepper/tls.pdf | |
159 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 160 | |
36959681 | 161 | class Target_i386 : public Target_freebsd<32, false> |
14bfc3f5 ILT |
162 | { |
163 | public: | |
5a6f7e2d ILT |
164 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
165 | ||
14bfc3f5 | 166 | Target_i386() |
36959681 | 167 | : Target_freebsd<32, false>(&i386_info), |
a8df5856 ILT |
168 | got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL), |
169 | global_offset_table_(NULL), rel_dyn_(NULL), | |
170 | copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 171 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 172 | { } |
75f65a3e | 173 | |
0897ed3b ST |
174 | inline bool |
175 | can_check_for_function_pointers() const | |
176 | { return true; } | |
177 | ||
6d03d481 ST |
178 | // Process the relocations to determine unreferenced sections for |
179 | // garbage collection. | |
180 | void | |
ad0f2072 | 181 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
182 | Layout* layout, |
183 | Sized_relobj<32, false>* object, | |
184 | unsigned int data_shndx, | |
185 | unsigned int sh_type, | |
186 | const unsigned char* prelocs, | |
187 | size_t reloc_count, | |
188 | Output_section* output_section, | |
189 | bool needs_special_offset_handling, | |
190 | size_t local_symbol_count, | |
191 | const unsigned char* plocal_symbols); | |
192 | ||
92e059d8 | 193 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 194 | void |
ad0f2072 | 195 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 196 | Layout* layout, |
f6ce93d6 | 197 | Sized_relobj<32, false>* object, |
a3ad94ed | 198 | unsigned int data_shndx, |
92e059d8 ILT |
199 | unsigned int sh_type, |
200 | const unsigned char* prelocs, | |
201 | size_t reloc_count, | |
730cdc88 ILT |
202 | Output_section* output_section, |
203 | bool needs_special_offset_handling, | |
92e059d8 | 204 | size_t local_symbol_count, |
730cdc88 | 205 | const unsigned char* plocal_symbols); |
61ba1cf9 | 206 | |
5a6f7e2d ILT |
207 | // Finalize the sections. |
208 | void | |
f59f41f3 | 209 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 210 | |
ab5c9e90 ILT |
211 | // Return the value to use for a dynamic which requires special |
212 | // treatment. | |
213 | uint64_t | |
214 | do_dynsym_value(const Symbol*) const; | |
215 | ||
92e059d8 ILT |
216 | // Relocate a section. |
217 | void | |
218 | relocate_section(const Relocate_info<32, false>*, | |
219 | unsigned int sh_type, | |
220 | const unsigned char* prelocs, | |
221 | size_t reloc_count, | |
730cdc88 ILT |
222 | Output_section* output_section, |
223 | bool needs_special_offset_handling, | |
92e059d8 ILT |
224 | unsigned char* view, |
225 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
226 | section_size_type view_size, |
227 | const Reloc_symbol_changes*); | |
92e059d8 | 228 | |
6a74a719 ILT |
229 | // Scan the relocs during a relocatable link. |
230 | void | |
ad0f2072 | 231 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
232 | Layout* layout, |
233 | Sized_relobj<32, false>* object, | |
234 | unsigned int data_shndx, | |
235 | unsigned int sh_type, | |
236 | const unsigned char* prelocs, | |
237 | size_t reloc_count, | |
238 | Output_section* output_section, | |
239 | bool needs_special_offset_handling, | |
240 | size_t local_symbol_count, | |
241 | const unsigned char* plocal_symbols, | |
242 | Relocatable_relocs*); | |
243 | ||
244 | // Relocate a section during a relocatable link. | |
245 | void | |
246 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
247 | unsigned int sh_type, | |
248 | const unsigned char* prelocs, | |
249 | size_t reloc_count, | |
250 | Output_section* output_section, | |
251 | off_t offset_in_output_section, | |
252 | const Relocatable_relocs*, | |
253 | unsigned char* view, | |
254 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
255 | section_size_type view_size, | |
256 | unsigned char* reloc_view, | |
257 | section_size_type reloc_view_size); | |
258 | ||
c51e6221 ILT |
259 | // Return a string used to fill a code section with nops. |
260 | std::string | |
8851ecca | 261 | do_code_fill(section_size_type length) const; |
c51e6221 | 262 | |
9a2d6984 ILT |
263 | // Return whether SYM is defined by the ABI. |
264 | bool | |
9c2d0ef9 | 265 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
266 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
267 | ||
bb04269c DK |
268 | // Return whether a symbol name implies a local label. The UnixWare |
269 | // 2.1 cc generates temporary symbols that start with .X, so we | |
270 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
271 | // If so, we should move the .X recognition into | |
272 | // Target::do_is_local_label_name. | |
273 | bool | |
274 | do_is_local_label_name(const char* name) const | |
275 | { | |
276 | if (name[0] == '.' && name[1] == 'X') | |
277 | return true; | |
278 | return Target::do_is_local_label_name(name); | |
279 | } | |
280 | ||
7223e9ca ILT |
281 | // Return the PLT section. |
282 | Output_data* | |
283 | do_plt_section_for_global(const Symbol*) const | |
284 | { return this->plt_section(); } | |
285 | ||
286 | Output_data* | |
287 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
288 | { return this->plt_section(); } | |
289 | ||
b6848d3c ILT |
290 | // Return whether SYM is call to a non-split function. |
291 | bool | |
292 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
293 | ||
364c7fa5 ILT |
294 | // Adjust -fstack-split code which calls non-stack-split code. |
295 | void | |
296 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
297 | section_offset_type fnoffset, section_size_type fnsize, | |
298 | unsigned char* view, section_size_type view_size, | |
299 | std::string* from, std::string* to) const; | |
300 | ||
96f2030e | 301 | // Return the size of the GOT section. |
fe8718a4 | 302 | section_size_type |
0e70b911 | 303 | got_size() const |
96f2030e ILT |
304 | { |
305 | gold_assert(this->got_ != NULL); | |
306 | return this->got_->data_size(); | |
307 | } | |
308 | ||
0e70b911 CC |
309 | // Return the number of entries in the GOT. |
310 | unsigned int | |
311 | got_entry_count() const | |
312 | { | |
313 | if (this->got_ == NULL) | |
314 | return 0; | |
315 | return this->got_size() / 4; | |
316 | } | |
317 | ||
318 | // Return the number of entries in the PLT. | |
319 | unsigned int | |
320 | plt_entry_count() const; | |
321 | ||
322 | // Return the offset of the first non-reserved PLT entry. | |
323 | unsigned int | |
324 | first_plt_entry_offset() const; | |
325 | ||
326 | // Return the size of each PLT entry. | |
327 | unsigned int | |
328 | plt_entry_size() const; | |
329 | ||
92e059d8 ILT |
330 | private: |
331 | // The class which scans relocations. | |
332 | struct Scan | |
61ba1cf9 ILT |
333 | { |
334 | inline void | |
ad0f2072 | 335 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 336 | Sized_relobj<32, false>* object, |
a3ad94ed | 337 | unsigned int data_shndx, |
07f397ab | 338 | Output_section* output_section, |
92e059d8 ILT |
339 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
340 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 341 | |
92e059d8 | 342 | inline void |
ad0f2072 | 343 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 344 | Sized_relobj<32, false>* object, |
a3ad94ed | 345 | unsigned int data_shndx, |
07f397ab | 346 | Output_section* output_section, |
92e059d8 ILT |
347 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
348 | Symbol* gsym); | |
af6359d5 | 349 | |
21bb3914 | 350 | inline bool |
0897ed3b ST |
351 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
352 | Target_i386* target, | |
353 | Sized_relobj<32, false>* object, | |
354 | unsigned int data_shndx, | |
355 | Output_section* output_section, | |
356 | const elfcpp::Rel<32, false>& reloc, | |
357 | unsigned int r_type, | |
358 | const elfcpp::Sym<32, false>& lsym); | |
359 | ||
360 | inline bool | |
361 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
362 | Target_i386* target, | |
363 | Sized_relobj<32, false>* object, | |
364 | unsigned int data_shndx, | |
365 | Output_section* output_section, | |
366 | const elfcpp::Rel<32, false>& reloc, | |
367 | unsigned int r_type, | |
368 | Symbol* gsym); | |
21bb3914 ST |
369 | |
370 | inline bool | |
0897ed3b | 371 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 372 | |
7223e9ca ILT |
373 | bool |
374 | reloc_needs_plt_for_ifunc(Sized_relobj<32, false>*, unsigned int r_type); | |
375 | ||
af6359d5 ILT |
376 | static void |
377 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
378 | ||
379 | static void | |
380 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
381 | Symbol*); | |
61ba1cf9 ILT |
382 | }; |
383 | ||
92e059d8 ILT |
384 | // The class which implements relocation. |
385 | class Relocate | |
386 | { | |
387 | public: | |
ead1e424 | 388 | Relocate() |
46cf9fa2 | 389 | : skip_call_tls_get_addr_(false), |
82bb573a | 390 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
391 | { } |
392 | ||
393 | ~Relocate() | |
394 | { | |
395 | if (this->skip_call_tls_get_addr_) | |
396 | { | |
397 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 398 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
399 | } |
400 | } | |
401 | ||
86849f1f ILT |
402 | // Return whether the static relocation needs to be applied. |
403 | inline bool | |
404 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 405 | int ref_flags, |
031cdbed ILT |
406 | bool is_32bit, |
407 | Output_section* output_section); | |
86849f1f | 408 | |
ead1e424 ILT |
409 | // Do a relocation. Return false if the caller should not issue |
410 | // any warnings about this relocation. | |
411 | inline bool | |
031cdbed ILT |
412 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
413 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 414 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 415 | const Symbol_value<32>*, |
92e059d8 | 416 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 417 | section_size_type); |
92e059d8 ILT |
418 | |
419 | private: | |
420 | // Do a TLS relocation. | |
ead1e424 | 421 | inline void |
07f397ab ILT |
422 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
423 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 424 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 425 | const Symbol_value<32>*, |
fe8718a4 ILT |
426 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
427 | section_size_type); | |
92e059d8 | 428 | |
07f397ab ILT |
429 | // Do a TLS General-Dynamic to Initial-Exec transition. |
430 | inline void | |
431 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
432 | Output_segment* tls_segment, | |
433 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
434 | elfcpp::Elf_types<32>::Elf_Addr value, | |
435 | unsigned char* view, | |
fe8718a4 | 436 | section_size_type view_size); |
07f397ab | 437 | |
56622147 ILT |
438 | // Do a TLS General-Dynamic to Local-Exec transition. |
439 | inline void | |
440 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
441 | Output_segment* tls_segment, |
442 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
443 | elfcpp::Elf_types<32>::Elf_Addr value, | |
444 | unsigned char* view, | |
fe8718a4 | 445 | section_size_type view_size); |
92e059d8 | 446 | |
c2b45e22 CC |
447 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
448 | // transition. | |
449 | inline void | |
450 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
451 | Output_segment* tls_segment, | |
452 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
453 | elfcpp::Elf_types<32>::Elf_Addr value, | |
454 | unsigned char* view, | |
455 | section_size_type view_size); | |
456 | ||
457 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
458 | // transition. | |
459 | inline void | |
460 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
461 | Output_segment* tls_segment, | |
462 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
463 | elfcpp::Elf_types<32>::Elf_Addr value, | |
464 | unsigned char* view, | |
465 | section_size_type view_size); | |
466 | ||
56622147 | 467 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 468 | inline void |
56622147 | 469 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
470 | Output_segment* tls_segment, |
471 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
472 | elfcpp::Elf_types<32>::Elf_Addr value, | |
473 | unsigned char* view, | |
fe8718a4 | 474 | section_size_type view_size); |
ead1e424 | 475 | |
56622147 ILT |
476 | // Do a TLS Initial-Exec to Local-Exec transition. |
477 | static inline void | |
478 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
479 | Output_segment* tls_segment, |
480 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
481 | elfcpp::Elf_types<32>::Elf_Addr value, | |
482 | unsigned char* view, | |
fe8718a4 | 483 | section_size_type view_size); |
46cf9fa2 | 484 | |
46cf9fa2 ILT |
485 | // We need to keep track of which type of local dynamic relocation |
486 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
487 | enum Local_dynamic_type | |
488 | { | |
489 | LOCAL_DYNAMIC_NONE, | |
490 | LOCAL_DYNAMIC_SUN, | |
491 | LOCAL_DYNAMIC_GNU | |
492 | }; | |
493 | ||
ead1e424 ILT |
494 | // This is set if we should skip the next reloc, which should be a |
495 | // PLT32 reloc against ___tls_get_addr. | |
496 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
497 | // The type of local dynamic relocation we have seen in the section |
498 | // being relocated, if any. | |
499 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
500 | }; |
501 | ||
6a74a719 ILT |
502 | // A class which returns the size required for a relocation type, |
503 | // used while scanning relocs during a relocatable link. | |
504 | class Relocatable_size_for_reloc | |
505 | { | |
506 | public: | |
507 | unsigned int | |
508 | get_size_for_reloc(unsigned int, Relobj*); | |
509 | }; | |
510 | ||
92e059d8 ILT |
511 | // Adjust TLS relocation type based on the options and whether this |
512 | // is a local symbol. | |
af6359d5 | 513 | static tls::Tls_optimization |
7e1edb90 | 514 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 515 | |
ead1e424 | 516 | // Get the GOT section, creating it if necessary. |
dbe717ef | 517 | Output_data_got<32, false>* |
7e1edb90 | 518 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 519 | |
96f2030e ILT |
520 | // Get the GOT PLT section. |
521 | Output_data_space* | |
522 | got_plt_section() const | |
523 | { | |
524 | gold_assert(this->got_plt_ != NULL); | |
525 | return this->got_plt_; | |
526 | } | |
527 | ||
a8df5856 ILT |
528 | // Get the GOT section for TLSDESC entries. |
529 | Output_data_got<32, false>* | |
530 | got_tlsdesc_section() const | |
531 | { | |
532 | gold_assert(this->got_tlsdesc_ != NULL); | |
533 | return this->got_tlsdesc_; | |
534 | } | |
535 | ||
7223e9ca ILT |
536 | // Create the PLT section. |
537 | void | |
538 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
539 | ||
a3ad94ed ILT |
540 | // Create a PLT entry for a global symbol. |
541 | void | |
7e1edb90 | 542 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 543 | |
7223e9ca ILT |
544 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
545 | void | |
546 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
547 | Sized_relobj<32, false>* relobj, | |
548 | unsigned int local_sym_index); | |
549 | ||
9fa33bee | 550 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
551 | void |
552 | define_tls_base_symbol(Symbol_table*, Layout*); | |
553 | ||
94c4710f ILT |
554 | // Create a GOT entry for the TLS module index. |
555 | unsigned int | |
556 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
557 | Sized_relobj<32, false>* object); | |
558 | ||
a3ad94ed | 559 | // Get the PLT section. |
e291e7b9 | 560 | Output_data_plt_i386* |
a3ad94ed ILT |
561 | plt_section() const |
562 | { | |
563 | gold_assert(this->plt_ != NULL); | |
564 | return this->plt_; | |
565 | } | |
566 | ||
5a6f7e2d ILT |
567 | // Get the dynamic reloc section, creating it if necessary. |
568 | Reloc_section* | |
569 | rel_dyn_section(Layout*); | |
570 | ||
e291e7b9 ILT |
571 | // Get the section to use for TLS_DESC relocations. |
572 | Reloc_section* | |
573 | rel_tls_desc_section(Layout*) const; | |
574 | ||
12c0daef | 575 | // Add a potential copy relocation. |
a3ad94ed | 576 | void |
ef9beddf ILT |
577 | copy_reloc(Symbol_table* symtab, Layout* layout, |
578 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
579 | unsigned int shndx, Output_section* output_section, |
580 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
581 | { | |
582 | this->copy_relocs_.copy_reloc(symtab, layout, | |
583 | symtab->get_sized_symbol<32>(sym), | |
584 | object, shndx, output_section, reloc, | |
585 | this->rel_dyn_section(layout)); | |
586 | } | |
ead1e424 | 587 | |
92e059d8 ILT |
588 | // Information about this specific target which we pass to the |
589 | // general Target structure. | |
75f65a3e | 590 | static const Target::Target_info i386_info; |
ead1e424 | 591 | |
0a65a3a7 | 592 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
593 | // These values are exposed to the ABI in an incremental link. |
594 | // Do not renumber existing values without changing the version | |
595 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
596 | enum Got_type |
597 | { | |
598 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
599 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
600 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
601 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
602 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
603 | }; |
604 | ||
ead1e424 | 605 | // The GOT section. |
dbe717ef | 606 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
607 | // The PLT section. |
608 | Output_data_plt_i386* plt_; | |
609 | // The GOT PLT section. | |
610 | Output_data_space* got_plt_; | |
a8df5856 ILT |
611 | // The GOT section for TLSDESC relocations. |
612 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
613 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
614 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
615 | // The dynamic reloc section. |
616 | Reloc_section* rel_dyn_; | |
617 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 618 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
619 | // Space for variables copied with a COPY reloc. |
620 | Output_data_space* dynbss_; | |
c2b45e22 | 621 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 622 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
623 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
624 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
625 | }; |
626 | ||
627 | const Target::Target_info Target_i386::i386_info = | |
628 | { | |
61ba1cf9 ILT |
629 | 32, // size |
630 | false, // is_big_endian | |
631 | elfcpp::EM_386, // machine_code | |
632 | false, // has_make_symbol | |
dbe717ef | 633 | false, // has_resolve |
c51e6221 | 634 | true, // has_code_fill |
35cdfc9a | 635 | true, // is_default_stack_executable |
0864d551 | 636 | '\0', // wrap_char |
dbe717ef | 637 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 638 | 0x08048000, // default_text_segment_address |
cd72c291 | 639 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
640 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
641 | elfcpp::SHN_UNDEF, // small_common_shndx | |
642 | elfcpp::SHN_UNDEF, // large_common_shndx | |
643 | 0, // small_common_section_flags | |
05a352e6 DK |
644 | 0, // large_common_section_flags |
645 | NULL, // attributes_section | |
646 | NULL // attributes_vendor | |
14bfc3f5 ILT |
647 | }; |
648 | ||
ead1e424 ILT |
649 | // Get the GOT section, creating it if necessary. |
650 | ||
dbe717ef | 651 | Output_data_got<32, false>* |
7e1edb90 | 652 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
653 | { |
654 | if (this->got_ == NULL) | |
655 | { | |
7e1edb90 | 656 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 657 | |
7e1edb90 | 658 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 659 | |
82742395 ILT |
660 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
661 | (elfcpp::SHF_ALLOC | |
662 | | elfcpp::SHF_WRITE), | |
22f0da72 | 663 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 664 | |
7d9e3d98 | 665 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
666 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
667 | (elfcpp::SHF_ALLOC | |
668 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
669 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
670 | false); | |
a3ad94ed | 671 | |
ead1e424 | 672 | // The first three entries are reserved. |
27bc2bce | 673 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 674 | |
1a2dff53 ILT |
675 | // Those bytes can go into the relro segment. |
676 | layout->increase_relro(3 * 4); | |
677 | ||
a3ad94ed | 678 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
679 | this->global_offset_table_ = |
680 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
681 | Symbol_table::PREDEFINED, | |
682 | this->got_plt_, | |
683 | 0, 0, elfcpp::STT_OBJECT, | |
684 | elfcpp::STB_LOCAL, | |
685 | elfcpp::STV_HIDDEN, 0, | |
686 | false, false); | |
a8df5856 ILT |
687 | |
688 | // If there are any TLSDESC relocations, they get GOT entries in | |
689 | // .got.plt after the jump slot entries. | |
690 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
691 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
692 | (elfcpp::SHF_ALLOC | |
693 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
694 | this->got_tlsdesc_, |
695 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 696 | } |
a3ad94ed | 697 | |
ead1e424 ILT |
698 | return this->got_; |
699 | } | |
700 | ||
5a6f7e2d ILT |
701 | // Get the dynamic reloc section, creating it if necessary. |
702 | ||
703 | Target_i386::Reloc_section* | |
704 | Target_i386::rel_dyn_section(Layout* layout) | |
705 | { | |
706 | if (this->rel_dyn_ == NULL) | |
707 | { | |
708 | gold_assert(layout != NULL); | |
d98bc257 | 709 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 710 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
711 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
712 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
713 | } |
714 | return this->rel_dyn_; | |
715 | } | |
716 | ||
a3ad94ed ILT |
717 | // Create the PLT section. The ordinary .got section is an argument, |
718 | // since we need to refer to the start. We also create our own .got | |
719 | // section just for PLT entries. | |
720 | ||
7223e9ca ILT |
721 | Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab, |
722 | Layout* layout, | |
7e1edb90 | 723 | Output_data_space* got_plt) |
7223e9ca ILT |
724 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0), |
725 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 726 | { |
d98bc257 | 727 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 728 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
729 | elfcpp::SHF_ALLOC, this->rel_, |
730 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
731 | |
732 | if (parameters->doing_static_link()) | |
733 | { | |
734 | // A statically linked executable will only have a .rel.plt | |
735 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
736 | // symbols. The library will use these symbols to locate the | |
737 | // IRELATIVE relocs at program startup time. | |
738 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
739 | Symbol_table::PREDEFINED, | |
740 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
741 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
742 | 0, false, true); | |
743 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
744 | Symbol_table::PREDEFINED, | |
745 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
746 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
747 | 0, true, true); | |
748 | } | |
a3ad94ed ILT |
749 | } |
750 | ||
16649710 ILT |
751 | void |
752 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
753 | { | |
754 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
755 | // linker, and so do we. | |
756 | os->set_entsize(4); | |
757 | } | |
758 | ||
a3ad94ed ILT |
759 | // Add an entry to the PLT. |
760 | ||
761 | void | |
762 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
763 | { | |
764 | gold_assert(!gsym->has_plt_offset()); | |
765 | ||
766 | // Note that when setting the PLT offset we skip the initial | |
767 | // reserved PLT entry. | |
768 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
769 | ||
770 | ++this->count_; | |
771 | ||
fe8718a4 | 772 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
773 | |
774 | // Every PLT entry needs a GOT entry which points back to the PLT | |
775 | // entry (this will be changed by the dynamic linker, normally | |
776 | // lazily when the function is called). | |
27bc2bce | 777 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
778 | |
779 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
780 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
781 | && gsym->can_use_relative_reloc(false)) | |
782 | { | |
783 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
784 | this->got_plt_, got_offset); | |
785 | struct Global_ifunc gi; | |
786 | gi.sym = gsym; | |
787 | gi.got_offset = got_offset; | |
788 | this->global_ifuncs_.push_back(gi); | |
789 | } | |
790 | else | |
791 | { | |
792 | gsym->set_needs_dynsym_entry(); | |
793 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
794 | got_offset); | |
795 | } | |
a3ad94ed ILT |
796 | |
797 | // Note that we don't need to save the symbol. The contents of the | |
798 | // PLT are independent of which symbols are used. The symbols only | |
799 | // appear in the relocations. | |
800 | } | |
801 | ||
7223e9ca ILT |
802 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
803 | // the PLT offset. | |
804 | ||
805 | unsigned int | |
806 | Output_data_plt_i386::add_local_ifunc_entry(Sized_relobj<32, false>* relobj, | |
807 | unsigned int local_sym_index) | |
808 | { | |
809 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
810 | ++this->count_; | |
811 | ||
812 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
813 | ||
814 | // Every PLT entry needs a GOT entry which points back to the PLT | |
815 | // entry. | |
816 | this->got_plt_->set_current_data_size(got_offset + 4); | |
817 | ||
818 | // Every PLT entry needs a reloc. | |
819 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
820 | elfcpp::R_386_IRELATIVE, | |
821 | this->got_plt_, got_offset); | |
822 | ||
823 | struct Local_ifunc li; | |
824 | li.object = relobj; | |
825 | li.local_sym_index = local_sym_index; | |
826 | li.got_offset = got_offset; | |
827 | this->local_ifuncs_.push_back(li); | |
828 | ||
829 | return plt_offset; | |
830 | } | |
831 | ||
e291e7b9 ILT |
832 | // Return where the TLS_DESC relocations should go, creating it if |
833 | // necessary. These follow the JUMP_SLOT relocations. | |
834 | ||
835 | Output_data_plt_i386::Reloc_section* | |
836 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
837 | { | |
838 | if (this->tls_desc_rel_ == NULL) | |
839 | { | |
840 | this->tls_desc_rel_ = new Reloc_section(false); | |
841 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
842 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 843 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
844 | gold_assert(this->tls_desc_rel_->output_section() == |
845 | this->rel_->output_section()); | |
846 | } | |
847 | return this->tls_desc_rel_; | |
848 | } | |
849 | ||
a3ad94ed ILT |
850 | // The first entry in the PLT for an executable. |
851 | ||
852 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
853 | { | |
854 | 0xff, 0x35, // pushl contents of memory address | |
855 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
856 | 0xff, 0x25, // jmp indirect | |
857 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
858 | 0, 0, 0, 0 // unused | |
859 | }; | |
860 | ||
861 | // The first entry in the PLT for a shared object. | |
862 | ||
863 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
864 | { | |
865 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
866 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
867 | 0, 0, 0, 0 // unused | |
868 | }; | |
869 | ||
870 | // Subsequent entries in the PLT for an executable. | |
871 | ||
872 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
873 | { | |
874 | 0xff, 0x25, // jmp indirect | |
875 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
876 | 0x68, // pushl immediate | |
877 | 0, 0, 0, 0, // replaced with offset into relocation table | |
878 | 0xe9, // jmp relative | |
879 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
880 | }; | |
881 | ||
882 | // Subsequent entries in the PLT for a shared object. | |
883 | ||
884 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
885 | { | |
886 | 0xff, 0xa3, // jmp *offset(%ebx) | |
887 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
888 | 0x68, // pushl immediate | |
889 | 0, 0, 0, 0, // replaced with offset into relocation table | |
890 | 0xe9, // jmp relative | |
891 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
892 | }; | |
893 | ||
894 | // Write out the PLT. This uses the hand-coded instructions above, | |
895 | // and adjusts them as needed. This is all specified by the i386 ELF | |
896 | // Processor Supplement. | |
897 | ||
898 | void | |
899 | Output_data_plt_i386::do_write(Output_file* of) | |
900 | { | |
2ea97941 | 901 | const off_t offset = this->offset(); |
fe8718a4 ILT |
902 | const section_size_type oview_size = |
903 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 904 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
905 | |
906 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
907 | const section_size_type got_size = |
908 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
909 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
910 | got_size); | |
911 | ||
912 | unsigned char* pov = oview; | |
913 | ||
914 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
915 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
916 | ||
374ad285 | 917 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
918 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
919 | else | |
920 | { | |
921 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
922 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
923 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
924 | } | |
925 | pov += plt_entry_size; | |
926 | ||
927 | unsigned char* got_pov = got_view; | |
928 | ||
929 | memset(got_pov, 0, 12); | |
930 | got_pov += 12; | |
931 | ||
932 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
933 | ||
934 | unsigned int plt_offset = plt_entry_size; | |
935 | unsigned int plt_rel_offset = 0; | |
936 | unsigned int got_offset = 12; | |
937 | const unsigned int count = this->count_; | |
938 | for (unsigned int i = 0; | |
939 | i < count; | |
940 | ++i, | |
941 | pov += plt_entry_size, | |
942 | got_pov += 4, | |
943 | plt_offset += plt_entry_size, | |
944 | plt_rel_offset += rel_size, | |
945 | got_offset += 4) | |
946 | { | |
947 | // Set and adjust the PLT entry itself. | |
948 | ||
374ad285 | 949 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
950 | { |
951 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
952 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
953 | } | |
954 | else | |
955 | { | |
956 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
957 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
958 | (got_address | |
959 | + got_offset)); | |
960 | } | |
961 | ||
962 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
963 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
964 | - (plt_offset + plt_entry_size)); | |
965 | ||
966 | // Set the entry in the GOT. | |
967 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
968 | } | |
969 | ||
7223e9ca ILT |
970 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
971 | // the GOT to point to the actual symbol value, rather than point to | |
972 | // the PLT entry. That will let the dynamic linker call the right | |
973 | // function when resolving IRELATIVE relocations. | |
974 | for (std::vector<Global_ifunc>::const_iterator p = | |
975 | this->global_ifuncs_.begin(); | |
976 | p != this->global_ifuncs_.end(); | |
977 | ++p) | |
978 | { | |
979 | const Sized_symbol<32>* ssym = | |
980 | static_cast<const Sized_symbol<32>*>(p->sym); | |
981 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
982 | ssym->value()); | |
983 | } | |
984 | ||
985 | for (std::vector<Local_ifunc>::const_iterator p = | |
986 | this->local_ifuncs_.begin(); | |
987 | p != this->local_ifuncs_.end(); | |
988 | ++p) | |
989 | { | |
990 | const Symbol_value<32>* psymval = | |
991 | p->object->local_symbol(p->local_sym_index); | |
992 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
993 | psymval->value(p->object, 0)); | |
994 | } | |
995 | ||
fe8718a4 ILT |
996 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
997 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 998 | |
2ea97941 | 999 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1000 | of->write_output_view(got_file_offset, got_size, got_view); |
1001 | } | |
1002 | ||
7223e9ca | 1003 | // Create the PLT section. |
a3ad94ed ILT |
1004 | |
1005 | void | |
7223e9ca | 1006 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1007 | { |
a3ad94ed ILT |
1008 | if (this->plt_ == NULL) |
1009 | { | |
1010 | // Create the GOT sections first. | |
7e1edb90 | 1011 | this->got_section(symtab, layout); |
a3ad94ed | 1012 | |
7223e9ca | 1013 | this->plt_ = new Output_data_plt_i386(symtab, layout, this->got_plt_); |
16649710 ILT |
1014 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1015 | (elfcpp::SHF_ALLOC | |
1016 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1017 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1018 | |
1019 | // Make the sh_info field of .rel.plt point to .plt. | |
1020 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1021 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1022 | } |
7223e9ca | 1023 | } |
a3ad94ed | 1024 | |
7223e9ca ILT |
1025 | // Create a PLT entry for a global symbol. |
1026 | ||
1027 | void | |
1028 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1029 | { | |
1030 | if (gsym->has_plt_offset()) | |
1031 | return; | |
1032 | if (this->plt_ == NULL) | |
1033 | this->make_plt_section(symtab, layout); | |
a3ad94ed ILT |
1034 | this->plt_->add_entry(gsym); |
1035 | } | |
1036 | ||
7223e9ca ILT |
1037 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1038 | ||
1039 | void | |
1040 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
1041 | Sized_relobj<32, false>* relobj, | |
1042 | unsigned int local_sym_index) | |
1043 | { | |
1044 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1045 | return; | |
1046 | if (this->plt_ == NULL) | |
1047 | this->make_plt_section(symtab, layout); | |
1048 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1049 | local_sym_index); | |
1050 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1051 | } | |
1052 | ||
0e70b911 CC |
1053 | // Return the number of entries in the PLT. |
1054 | ||
1055 | unsigned int | |
1056 | Target_i386::plt_entry_count() const | |
1057 | { | |
1058 | if (this->plt_ == NULL) | |
1059 | return 0; | |
1060 | return this->plt_->entry_count(); | |
1061 | } | |
1062 | ||
1063 | // Return the offset of the first non-reserved PLT entry. | |
1064 | ||
1065 | unsigned int | |
1066 | Target_i386::first_plt_entry_offset() const | |
1067 | { | |
1068 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1069 | } | |
1070 | ||
1071 | // Return the size of each PLT entry. | |
1072 | ||
1073 | unsigned int | |
1074 | Target_i386::plt_entry_size() const | |
1075 | { | |
1076 | return Output_data_plt_i386::get_plt_entry_size(); | |
1077 | } | |
1078 | ||
e291e7b9 ILT |
1079 | // Get the section to use for TLS_DESC relocations. |
1080 | ||
1081 | Target_i386::Reloc_section* | |
1082 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1083 | { | |
1084 | return this->plt_section()->rel_tls_desc(layout); | |
1085 | } | |
1086 | ||
9fa33bee | 1087 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1088 | |
1089 | void | |
1090 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1091 | { | |
1092 | if (this->tls_base_symbol_defined_) | |
1093 | return; | |
1094 | ||
1095 | Output_segment* tls_segment = layout->tls_segment(); | |
1096 | if (tls_segment != NULL) | |
1097 | { | |
183fd0e3 | 1098 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1099 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1100 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1101 | tls_segment, 0, 0, |
1102 | elfcpp::STT_TLS, | |
1103 | elfcpp::STB_LOCAL, | |
1104 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1105 | (is_exec |
1106 | ? Symbol::SEGMENT_END | |
1107 | : Symbol::SEGMENT_START), | |
1108 | true); | |
edfbb029 CC |
1109 | } |
1110 | this->tls_base_symbol_defined_ = true; | |
1111 | } | |
1112 | ||
94c4710f ILT |
1113 | // Create a GOT entry for the TLS module index. |
1114 | ||
1115 | unsigned int | |
1116 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1117 | Sized_relobj<32, false>* object) | |
1118 | { | |
1119 | if (this->got_mod_index_offset_ == -1U) | |
1120 | { | |
1121 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1122 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1123 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1124 | unsigned int got_offset = got->add_constant(0); | |
1125 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1126 | got_offset); | |
009a67a2 | 1127 | got->add_constant(0); |
94c4710f ILT |
1128 | this->got_mod_index_offset_ = got_offset; |
1129 | } | |
1130 | return this->got_mod_index_offset_; | |
1131 | } | |
1132 | ||
92e059d8 | 1133 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1134 | // symbol. IS_FINAL is true if the final address of this symbol is |
1135 | // known at link time. | |
92e059d8 | 1136 | |
af6359d5 | 1137 | tls::Tls_optimization |
7e1edb90 | 1138 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1139 | { |
1140 | // If we are generating a shared library, then we can't do anything | |
1141 | // in the linker. | |
8851ecca | 1142 | if (parameters->options().shared()) |
af6359d5 | 1143 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1144 | |
1145 | switch (r_type) | |
1146 | { | |
1147 | case elfcpp::R_386_TLS_GD: | |
1148 | case elfcpp::R_386_TLS_GOTDESC: | |
1149 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1150 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1151 | // access. Since we know that we are generating an executable, |
1152 | // we can convert this to Initial-Exec. If we also know that | |
1153 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1154 | if (is_final) |
af6359d5 ILT |
1155 | return tls::TLSOPT_TO_LE; |
1156 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1157 | |
1158 | case elfcpp::R_386_TLS_LDM: | |
1159 | // This is Local-Dynamic, which refers to a local symbol in the | |
1160 | // dynamic TLS block. Since we know that we generating an | |
1161 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1162 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1163 | |
1164 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1165 | // Another type of Local-Dynamic relocation. |
1166 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1167 | |
1168 | case elfcpp::R_386_TLS_IE: | |
1169 | case elfcpp::R_386_TLS_GOTIE: | |
1170 | case elfcpp::R_386_TLS_IE_32: | |
1171 | // These are Initial-Exec relocs which get the thread offset | |
1172 | // from the GOT. If we know that we are linking against the | |
1173 | // local symbol, we can switch to Local-Exec, which links the | |
1174 | // thread offset into the instruction. | |
a3ad94ed | 1175 | if (is_final) |
af6359d5 ILT |
1176 | return tls::TLSOPT_TO_LE; |
1177 | return tls::TLSOPT_NONE; | |
8462ae85 | 1178 | |
92e059d8 ILT |
1179 | case elfcpp::R_386_TLS_LE: |
1180 | case elfcpp::R_386_TLS_LE_32: | |
1181 | // When we already have Local-Exec, there is nothing further we | |
1182 | // can do. | |
af6359d5 | 1183 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1184 | |
1185 | default: | |
a3ad94ed | 1186 | gold_unreachable(); |
92e059d8 ILT |
1187 | } |
1188 | } | |
1189 | ||
af6359d5 ILT |
1190 | // Report an unsupported relocation against a local symbol. |
1191 | ||
1192 | void | |
1193 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
1194 | unsigned int r_type) | |
1195 | { | |
75f2446e ILT |
1196 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1197 | object->name().c_str(), r_type); | |
af6359d5 ILT |
1198 | } |
1199 | ||
7223e9ca ILT |
1200 | // Return whether we need to make a PLT entry for a relocation of a |
1201 | // given type against a STT_GNU_IFUNC symbol. | |
1202 | ||
1203 | bool | |
1204 | Target_i386::Scan::reloc_needs_plt_for_ifunc(Sized_relobj<32, false>* object, | |
1205 | unsigned int r_type) | |
1206 | { | |
1207 | switch (r_type) | |
1208 | { | |
1209 | case elfcpp::R_386_NONE: | |
1210 | case elfcpp::R_386_GNU_VTINHERIT: | |
1211 | case elfcpp::R_386_GNU_VTENTRY: | |
1212 | return false; | |
1213 | ||
1214 | case elfcpp::R_386_32: | |
1215 | case elfcpp::R_386_16: | |
1216 | case elfcpp::R_386_8: | |
1217 | case elfcpp::R_386_PC32: | |
1218 | case elfcpp::R_386_PC16: | |
1219 | case elfcpp::R_386_PC8: | |
1220 | case elfcpp::R_386_PLT32: | |
1221 | case elfcpp::R_386_GOTOFF: | |
1222 | case elfcpp::R_386_GOTPC: | |
1223 | case elfcpp::R_386_GOT32: | |
1224 | return true; | |
1225 | ||
1226 | case elfcpp::R_386_COPY: | |
1227 | case elfcpp::R_386_GLOB_DAT: | |
1228 | case elfcpp::R_386_JUMP_SLOT: | |
1229 | case elfcpp::R_386_RELATIVE: | |
1230 | case elfcpp::R_386_IRELATIVE: | |
1231 | case elfcpp::R_386_TLS_TPOFF: | |
1232 | case elfcpp::R_386_TLS_DTPMOD32: | |
1233 | case elfcpp::R_386_TLS_DTPOFF32: | |
1234 | case elfcpp::R_386_TLS_TPOFF32: | |
1235 | case elfcpp::R_386_TLS_DESC: | |
1236 | // We will give an error later. | |
1237 | return false; | |
1238 | ||
1239 | case elfcpp::R_386_TLS_GD: | |
1240 | case elfcpp::R_386_TLS_GOTDESC: | |
1241 | case elfcpp::R_386_TLS_DESC_CALL: | |
1242 | case elfcpp::R_386_TLS_LDM: | |
1243 | case elfcpp::R_386_TLS_LDO_32: | |
1244 | case elfcpp::R_386_TLS_IE: | |
1245 | case elfcpp::R_386_TLS_IE_32: | |
1246 | case elfcpp::R_386_TLS_GOTIE: | |
1247 | case elfcpp::R_386_TLS_LE: | |
1248 | case elfcpp::R_386_TLS_LE_32: | |
1249 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1250 | object->name().c_str(), r_type); | |
1251 | return false; | |
1252 | ||
1253 | case elfcpp::R_386_32PLT: | |
1254 | case elfcpp::R_386_TLS_GD_32: | |
1255 | case elfcpp::R_386_TLS_GD_PUSH: | |
1256 | case elfcpp::R_386_TLS_GD_CALL: | |
1257 | case elfcpp::R_386_TLS_GD_POP: | |
1258 | case elfcpp::R_386_TLS_LDM_32: | |
1259 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1260 | case elfcpp::R_386_TLS_LDM_CALL: | |
1261 | case elfcpp::R_386_TLS_LDM_POP: | |
1262 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1263 | default: | |
1264 | // We will give an error later. | |
1265 | return false; | |
1266 | } | |
1267 | } | |
1268 | ||
92e059d8 ILT |
1269 | // Scan a relocation for a local symbol. |
1270 | ||
1271 | inline void | |
ad0f2072 | 1272 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1273 | Layout* layout, |
1274 | Target_i386* target, | |
f6ce93d6 | 1275 | Sized_relobj<32, false>* object, |
1b64748b | 1276 | unsigned int data_shndx, |
07f397ab | 1277 | Output_section* output_section, |
1b64748b | 1278 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1279 | unsigned int r_type, |
7bf1f802 | 1280 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1281 | { |
7223e9ca ILT |
1282 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1283 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1284 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1285 | { | |
1286 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1287 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1288 | } | |
1289 | ||
92e059d8 ILT |
1290 | switch (r_type) |
1291 | { | |
1292 | case elfcpp::R_386_NONE: | |
1293 | case elfcpp::R_386_GNU_VTINHERIT: | |
1294 | case elfcpp::R_386_GNU_VTENTRY: | |
1295 | break; | |
1296 | ||
1297 | case elfcpp::R_386_32: | |
436ca963 ILT |
1298 | // If building a shared library (or a position-independent |
1299 | // executable), we need to create a dynamic relocation for | |
1300 | // this location. The relocation applied at link time will | |
1301 | // apply the link-time value, so we flag the location with | |
1302 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1303 | // relocate it easily. | |
8851ecca | 1304 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1305 | { |
1306 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1307 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1308 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1309 | output_section, data_shndx, | |
1310 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1311 | } |
1312 | break; | |
1313 | ||
1314 | case elfcpp::R_386_16: | |
1315 | case elfcpp::R_386_8: | |
1316 | // If building a shared library (or a position-independent | |
1317 | // executable), we need to create a dynamic relocation for | |
1318 | // this location. Because the addend needs to remain in the | |
1319 | // data section, we need to be careful not to apply this | |
1320 | // relocation statically. | |
8851ecca | 1321 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1322 | { |
1323 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1324 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1325 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1326 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1327 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1328 | else |
1329 | { | |
1330 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1331 | unsigned int shndx = lsym.get_st_shndx(); |
1332 | bool is_ordinary; | |
1333 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1334 | &is_ordinary); | |
1335 | if (!is_ordinary) | |
1336 | object->error(_("section symbol %u has bad shndx %u"), | |
1337 | r_sym, shndx); | |
1338 | else | |
1339 | rel_dyn->add_local_section(object, shndx, | |
1340 | r_type, output_section, | |
1341 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1342 | } |
436ca963 | 1343 | } |
92e059d8 ILT |
1344 | break; |
1345 | ||
1346 | case elfcpp::R_386_PC32: | |
1347 | case elfcpp::R_386_PC16: | |
1348 | case elfcpp::R_386_PC8: | |
1349 | break; | |
1350 | ||
df2efe71 ILT |
1351 | case elfcpp::R_386_PLT32: |
1352 | // Since we know this is a local symbol, we can handle this as a | |
1353 | // PC32 reloc. | |
1354 | break; | |
1355 | ||
ead1e424 ILT |
1356 | case elfcpp::R_386_GOTOFF: |
1357 | case elfcpp::R_386_GOTPC: | |
1358 | // We need a GOT section. | |
7e1edb90 | 1359 | target->got_section(symtab, layout); |
ead1e424 ILT |
1360 | break; |
1361 | ||
1b64748b ILT |
1362 | case elfcpp::R_386_GOT32: |
1363 | { | |
1364 | // The symbol requires a GOT entry. | |
1365 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1366 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1367 | |
1368 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1369 | // lets function pointers compare correctly with shared | |
1370 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1371 | bool is_new; | |
1372 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1373 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1374 | else | |
1375 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1376 | if (is_new) | |
1b64748b ILT |
1377 | { |
1378 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1379 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1380 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1381 | { |
1382 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1383 | unsigned int got_offset = |
1384 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1385 | rel_dyn->add_local_relative(object, r_sym, | |
1386 | elfcpp::R_386_RELATIVE, | |
1387 | got, got_offset); | |
1b64748b ILT |
1388 | } |
1389 | } | |
1390 | } | |
1391 | break; | |
1392 | ||
af6359d5 ILT |
1393 | // These are relocations which should only be seen by the |
1394 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1395 | case elfcpp::R_386_COPY: |
1396 | case elfcpp::R_386_GLOB_DAT: | |
1397 | case elfcpp::R_386_JUMP_SLOT: | |
1398 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1399 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1400 | case elfcpp::R_386_TLS_TPOFF: |
1401 | case elfcpp::R_386_TLS_DTPMOD32: | |
1402 | case elfcpp::R_386_TLS_DTPOFF32: | |
1403 | case elfcpp::R_386_TLS_TPOFF32: | |
1404 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1405 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1406 | object->name().c_str(), r_type); |
92e059d8 ILT |
1407 | break; |
1408 | ||
af6359d5 | 1409 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1410 | // linking. |
56622147 ILT |
1411 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1412 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1413 | case elfcpp::R_386_TLS_DESC_CALL: | |
1414 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1415 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1416 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1417 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1418 | case elfcpp::R_386_TLS_GOTIE: |
1419 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1420 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1421 | { |
8851ecca | 1422 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1423 | const tls::Tls_optimization optimized_type |
1424 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1425 | switch (r_type) |
1426 | { | |
56622147 | 1427 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1428 | if (optimized_type == tls::TLSOPT_NONE) |
1429 | { | |
1430 | // Create a pair of GOT entries for the module index and | |
1431 | // dtv-relative offset. | |
1432 | Output_data_got<32, false>* got | |
1433 | = target->got_section(symtab, layout); | |
1434 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1435 | unsigned int shndx = lsym.get_st_shndx(); |
1436 | bool is_ordinary; | |
1437 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1438 | if (!is_ordinary) | |
1439 | object->error(_("local symbol %u has bad shndx %u"), | |
1440 | r_sym, shndx); | |
1441 | else | |
1442 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1443 | GOT_TYPE_TLS_PAIR, | |
1444 | target->rel_dyn_section(layout), | |
1445 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1446 | } |
1447 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1448 | unsupported_reloc_local(object, r_type); | |
1449 | break; | |
1450 | ||
56622147 | 1451 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1452 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1453 | if (optimized_type == tls::TLSOPT_NONE) |
1454 | { | |
a8df5856 ILT |
1455 | // Create a double GOT entry with an R_386_TLS_DESC |
1456 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1457 | // lazily, so the GOT entry needs to be in an area in | |
1458 | // .got.plt, not .got. Call got_section to make sure | |
1459 | // the section has been created. | |
1460 | target->got_section(symtab, layout); | |
1461 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1462 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1463 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1464 | { | |
1465 | unsigned int got_offset = got->add_constant(0); | |
1466 | // The local symbol value is stored in the second | |
1467 | // GOT entry. | |
1468 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1469 | // That set the GOT offset of the local symbol to | |
1470 | // point to the second entry, but we want it to | |
1471 | // point to the first. | |
1472 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1473 | got_offset); | |
1474 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1475 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1476 | } | |
c2b45e22 CC |
1477 | } |
1478 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1479 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1480 | break; |
1481 | ||
c2b45e22 CC |
1482 | case elfcpp::R_386_TLS_DESC_CALL: |
1483 | break; | |
1484 | ||
56622147 | 1485 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1486 | if (optimized_type == tls::TLSOPT_NONE) |
1487 | { | |
1488 | // Create a GOT entry for the module index. | |
94c4710f | 1489 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1490 | } |
1491 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1492 | unsupported_reloc_local(object, r_type); |
1493 | break; | |
1494 | ||
56622147 | 1495 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1496 | break; |
1497 | ||
56622147 ILT |
1498 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1499 | case elfcpp::R_386_TLS_IE_32: | |
1500 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1501 | layout->set_has_static_tls(); |
07f397ab ILT |
1502 | if (optimized_type == tls::TLSOPT_NONE) |
1503 | { | |
7bf1f802 ILT |
1504 | // For the R_386_TLS_IE relocation, we need to create a |
1505 | // dynamic relocation when building a shared library. | |
1506 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1507 | && parameters->options().shared()) |
7bf1f802 ILT |
1508 | { |
1509 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1510 | unsigned int r_sym |
1511 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1512 | rel_dyn->add_local_relative(object, r_sym, | |
1513 | elfcpp::R_386_RELATIVE, | |
1514 | output_section, data_shndx, | |
1515 | reloc.get_r_offset()); | |
7bf1f802 | 1516 | } |
07f397ab ILT |
1517 | // Create a GOT entry for the tp-relative offset. |
1518 | Output_data_got<32, false>* got | |
1519 | = target->got_section(symtab, layout); | |
1520 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1521 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1522 | ? elfcpp::R_386_TLS_TPOFF32 | |
1523 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1524 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1525 | ? GOT_TYPE_TLS_OFFSET | |
1526 | : GOT_TYPE_TLS_NOFFSET); | |
1527 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1528 | target->rel_dyn_section(layout), |
1529 | dyn_r_type); | |
07f397ab ILT |
1530 | } |
1531 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1532 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1533 | break; |
af6359d5 | 1534 | |
56622147 ILT |
1535 | case elfcpp::R_386_TLS_LE: // Local-exec |
1536 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1537 | layout->set_has_static_tls(); |
07f397ab | 1538 | if (output_is_shared) |
7bf1f802 ILT |
1539 | { |
1540 | // We need to create a dynamic relocation. | |
dceae3c1 | 1541 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1542 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1543 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1544 | ? elfcpp::R_386_TLS_TPOFF32 | |
1545 | : elfcpp::R_386_TLS_TPOFF); | |
1546 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1547 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1548 | data_shndx, reloc.get_r_offset()); | |
1549 | } | |
56622147 ILT |
1550 | break; |
1551 | ||
af6359d5 ILT |
1552 | default: |
1553 | gold_unreachable(); | |
7e1edb90 ILT |
1554 | } |
1555 | } | |
92e059d8 ILT |
1556 | break; |
1557 | ||
92e059d8 ILT |
1558 | case elfcpp::R_386_32PLT: |
1559 | case elfcpp::R_386_TLS_GD_32: | |
1560 | case elfcpp::R_386_TLS_GD_PUSH: | |
1561 | case elfcpp::R_386_TLS_GD_CALL: | |
1562 | case elfcpp::R_386_TLS_GD_POP: | |
1563 | case elfcpp::R_386_TLS_LDM_32: | |
1564 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1565 | case elfcpp::R_386_TLS_LDM_CALL: | |
1566 | case elfcpp::R_386_TLS_LDM_POP: | |
1567 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1568 | default: | |
af6359d5 | 1569 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1570 | break; |
1571 | } | |
1572 | } | |
1573 | ||
af6359d5 ILT |
1574 | // Report an unsupported relocation against a global symbol. |
1575 | ||
1576 | void | |
1577 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1578 | unsigned int r_type, | |
1579 | Symbol* gsym) | |
1580 | { | |
75f2446e | 1581 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1582 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1583 | } |
1584 | ||
0897ed3b ST |
1585 | inline bool |
1586 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1587 | { | |
1588 | switch (r_type) | |
1589 | { | |
1590 | case elfcpp::R_386_32: | |
1591 | case elfcpp::R_386_16: | |
1592 | case elfcpp::R_386_8: | |
1593 | case elfcpp::R_386_GOTOFF: | |
1594 | case elfcpp::R_386_GOT32: | |
1595 | { | |
1596 | return true; | |
1597 | } | |
1598 | default: | |
1599 | return false; | |
1600 | } | |
1601 | return false; | |
1602 | } | |
1603 | ||
1604 | inline bool | |
1605 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1606 | Symbol_table* , | |
1607 | Layout* , | |
1608 | Target_i386* , | |
1609 | Sized_relobj<32, false>* , | |
1610 | unsigned int , | |
1611 | Output_section* , | |
1612 | const elfcpp::Rel<32, false>& , | |
1613 | unsigned int r_type, | |
1614 | const elfcpp::Sym<32, false>&) | |
1615 | { | |
1616 | return possible_function_pointer_reloc(r_type); | |
1617 | } | |
1618 | ||
1619 | inline bool | |
1620 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1621 | Symbol_table* , | |
1622 | Layout* , | |
1623 | Target_i386* , | |
1624 | Sized_relobj<32, false>* , | |
1625 | unsigned int , | |
1626 | Output_section* , | |
1627 | const elfcpp::Rel<32, false>& , | |
1628 | unsigned int r_type, | |
1629 | Symbol*) | |
1630 | { | |
1631 | return possible_function_pointer_reloc(r_type); | |
1632 | } | |
1633 | ||
92e059d8 ILT |
1634 | // Scan a relocation for a global symbol. |
1635 | ||
1636 | inline void | |
ad0f2072 | 1637 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1638 | Layout* layout, |
1639 | Target_i386* target, | |
f6ce93d6 | 1640 | Sized_relobj<32, false>* object, |
a3ad94ed | 1641 | unsigned int data_shndx, |
07f397ab | 1642 | Output_section* output_section, |
a3ad94ed ILT |
1643 | const elfcpp::Rel<32, false>& reloc, |
1644 | unsigned int r_type, | |
92e059d8 ILT |
1645 | Symbol* gsym) |
1646 | { | |
7223e9ca ILT |
1647 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1648 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1649 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1650 | target->make_plt_entry(symtab, layout, gsym); | |
1651 | ||
92e059d8 ILT |
1652 | switch (r_type) |
1653 | { | |
1654 | case elfcpp::R_386_NONE: | |
1655 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1656 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1657 | break; |
1658 | ||
1659 | case elfcpp::R_386_32: | |
92e059d8 | 1660 | case elfcpp::R_386_16: |
92e059d8 | 1661 | case elfcpp::R_386_8: |
96f2030e | 1662 | { |
d61c6bd4 ILT |
1663 | // Make a PLT entry if necessary. |
1664 | if (gsym->needs_plt_entry()) | |
1665 | { | |
1666 | target->make_plt_entry(symtab, layout, gsym); | |
1667 | // Since this is not a PC-relative relocation, we may be | |
1668 | // taking the address of a function. In that case we need to | |
1669 | // set the entry in the dynamic symbol table to the address of | |
1670 | // the PLT entry. | |
8851ecca | 1671 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1672 | gsym->set_needs_dynsym_value(); |
1673 | } | |
1674 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1675 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1676 | { |
966d4097 | 1677 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1678 | { |
12c0daef | 1679 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1680 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1681 | } |
7223e9ca ILT |
1682 | else if (r_type == elfcpp::R_386_32 |
1683 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1684 | && gsym->can_use_relative_reloc(false) | |
1685 | && !gsym->is_from_dynobj() | |
1686 | && !gsym->is_undefined() | |
1687 | && !gsym->is_preemptible()) | |
1688 | { | |
1689 | // Use an IRELATIVE reloc for a locally defined | |
1690 | // STT_GNU_IFUNC symbol. This makes a function | |
1691 | // address in a PIE executable match the address in a | |
1692 | // shared library that it links against. | |
1693 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1694 | rel_dyn->add_symbolless_global_addend(gsym, | |
1695 | elfcpp::R_386_IRELATIVE, | |
1696 | output_section, | |
1697 | object, data_shndx, | |
1698 | reloc.get_r_offset()); | |
1699 | } | |
d61c6bd4 ILT |
1700 | else if (r_type == elfcpp::R_386_32 |
1701 | && gsym->can_use_relative_reloc(false)) | |
1702 | { | |
1703 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1704 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1705 | output_section, object, | |
1706 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1707 | } |
1708 | else | |
1709 | { | |
96f2030e | 1710 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1711 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1712 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1713 | } |
1714 | } | |
1715 | } | |
1716 | break; | |
1717 | ||
1718 | case elfcpp::R_386_PC32: | |
1719 | case elfcpp::R_386_PC16: | |
1720 | case elfcpp::R_386_PC8: | |
1721 | { | |
1722 | // Make a PLT entry if necessary. | |
1723 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1724 | { |
1725 | // These relocations are used for function calls only in | |
1726 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1727 | // we'll need a text relocation anyway, so we can skip the | |
1728 | // PLT entry and let the dynamic linker bind the call directly | |
1729 | // to the target. For smaller relocations, we should use a | |
1730 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1731 | if (!parameters->options().shared() |
7bf1f802 ILT |
1732 | || r_type != elfcpp::R_386_PC32) |
1733 | target->make_plt_entry(symtab, layout, gsym); | |
1734 | } | |
d61c6bd4 | 1735 | // Make a dynamic relocation if necessary. |
0700cf32 | 1736 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1737 | if (gsym->is_func()) |
0700cf32 ILT |
1738 | flags |= Symbol::FUNCTION_CALL; |
1739 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1740 | { |
966d4097 | 1741 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1742 | { |
12c0daef | 1743 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1744 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1745 | } |
86849f1f | 1746 | else |
d61c6bd4 ILT |
1747 | { |
1748 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1749 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1750 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1751 | } |
96f2030e ILT |
1752 | } |
1753 | } | |
92e059d8 ILT |
1754 | break; |
1755 | ||
ead1e424 | 1756 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1757 | { |
1758 | // The symbol requires a GOT entry. | |
7e1edb90 | 1759 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1760 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1761 | { |
1762 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1763 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1764 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1765 | else | |
1766 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1767 | } | |
7bf1f802 ILT |
1768 | else |
1769 | { | |
8462ae85 | 1770 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1771 | // GOT entry with a dynamic relocation. |
1772 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1773 | if (gsym->is_from_dynobj() |
1774 | || gsym->is_undefined() | |
7223e9ca ILT |
1775 | || gsym->is_preemptible() |
1776 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1777 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
1778 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1779 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1780 | else |
8462ae85 | 1781 | { |
7223e9ca ILT |
1782 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1783 | // offset into the GOT, so that function pointer | |
1784 | // comparisons work correctly. | |
1785 | bool is_new; | |
1786 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1787 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1788 | else | |
1789 | { | |
1790 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1791 | // Tell the dynamic linker to use the PLT address | |
1792 | // when resolving relocations. | |
1793 | if (gsym->is_from_dynobj() | |
1794 | && !parameters->options().shared()) | |
1795 | gsym->set_needs_dynsym_value(); | |
1796 | } | |
1797 | if (is_new) | |
1798 | { | |
1799 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1800 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
1801 | got, got_off); | |
1802 | } | |
8462ae85 ILT |
1803 | } |
1804 | } | |
1805 | } | |
ead1e424 ILT |
1806 | break; |
1807 | ||
1808 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1809 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1810 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1811 | if (gsym->final_value_is_known()) |
ead1e424 | 1812 | break; |
436ca963 ILT |
1813 | // If building a shared library, we can also skip the PLT entry |
1814 | // if the symbol is defined in the output file and is protected | |
1815 | // or hidden. | |
1816 | if (gsym->is_defined() | |
1817 | && !gsym->is_from_dynobj() | |
1818 | && !gsym->is_preemptible()) | |
1819 | break; | |
7e1edb90 | 1820 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1821 | break; |
1822 | ||
1823 | case elfcpp::R_386_GOTOFF: | |
1824 | case elfcpp::R_386_GOTPC: | |
1825 | // We need a GOT section. | |
7e1edb90 | 1826 | target->got_section(symtab, layout); |
ead1e424 ILT |
1827 | break; |
1828 | ||
af6359d5 ILT |
1829 | // These are relocations which should only be seen by the |
1830 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1831 | case elfcpp::R_386_COPY: |
1832 | case elfcpp::R_386_GLOB_DAT: | |
1833 | case elfcpp::R_386_JUMP_SLOT: | |
1834 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1835 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1836 | case elfcpp::R_386_TLS_TPOFF: |
1837 | case elfcpp::R_386_TLS_DTPMOD32: | |
1838 | case elfcpp::R_386_TLS_DTPOFF32: | |
1839 | case elfcpp::R_386_TLS_TPOFF32: | |
1840 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1841 | gold_error(_("%s: unexpected reloc %u in object file"), |
1842 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1843 | break; |
1844 | ||
d61c17ea ILT |
1845 | // These are initial tls relocs, which are expected when |
1846 | // linking. | |
56622147 ILT |
1847 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1848 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1849 | case elfcpp::R_386_TLS_DESC_CALL: | |
1850 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1851 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1852 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1853 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1854 | case elfcpp::R_386_TLS_GOTIE: |
1855 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1856 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1857 | { |
7e1edb90 | 1858 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1859 | const tls::Tls_optimization optimized_type |
1860 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1861 | switch (r_type) |
1862 | { | |
56622147 | 1863 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1864 | if (optimized_type == tls::TLSOPT_NONE) |
1865 | { | |
1866 | // Create a pair of GOT entries for the module index and | |
1867 | // dtv-relative offset. | |
1868 | Output_data_got<32, false>* got | |
1869 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1870 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1871 | target->rel_dyn_section(layout), |
1872 | elfcpp::R_386_TLS_DTPMOD32, | |
1873 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1874 | } |
1875 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1876 | { | |
1877 | // Create a GOT entry for the tp-relative offset. | |
1878 | Output_data_got<32, false>* got | |
1879 | = target->got_section(symtab, layout); | |
c2b45e22 | 1880 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1881 | target->rel_dyn_section(layout), |
c2b45e22 | 1882 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1883 | } |
1884 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1885 | unsupported_reloc_global(object, r_type, gsym); | |
1886 | break; | |
1887 | ||
56622147 | 1888 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1889 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1890 | if (optimized_type == tls::TLSOPT_NONE) |
1891 | { | |
a8df5856 ILT |
1892 | // Create a double GOT entry with an R_386_TLS_DESC |
1893 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1894 | // lazily, so the GOT entry needs to be in an area in | |
1895 | // .got.plt, not .got. Call got_section to make sure | |
1896 | // the section has been created. | |
1897 | target->got_section(symtab, layout); | |
1898 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1899 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1900 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1901 | elfcpp::R_386_TLS_DESC, 0); |
1902 | } | |
1903 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1904 | { | |
1905 | // Create a GOT entry for the tp-relative offset. | |
1906 | Output_data_got<32, false>* got | |
1907 | = target->got_section(symtab, layout); | |
1908 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1909 | target->rel_dyn_section(layout), | |
1910 | elfcpp::R_386_TLS_TPOFF); | |
1911 | } | |
1912 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1913 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1914 | break; |
1915 | ||
1916 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1917 | break; |
1918 | ||
56622147 | 1919 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1920 | if (optimized_type == tls::TLSOPT_NONE) |
1921 | { | |
1922 | // Create a GOT entry for the module index. | |
94c4710f | 1923 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1924 | } |
1925 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1926 | unsupported_reloc_global(object, r_type, gsym); |
1927 | break; | |
1928 | ||
56622147 | 1929 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1930 | break; |
1931 | ||
56622147 ILT |
1932 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1933 | case elfcpp::R_386_TLS_IE_32: | |
1934 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1935 | layout->set_has_static_tls(); |
07f397ab ILT |
1936 | if (optimized_type == tls::TLSOPT_NONE) |
1937 | { | |
7bf1f802 ILT |
1938 | // For the R_386_TLS_IE relocation, we need to create a |
1939 | // dynamic relocation when building a shared library. | |
1940 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1941 | && parameters->options().shared()) |
07f397ab | 1942 | { |
07f397ab | 1943 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1944 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1945 | output_section, object, | |
1946 | data_shndx, | |
1947 | reloc.get_r_offset()); | |
07f397ab | 1948 | } |
7bf1f802 ILT |
1949 | // Create a GOT entry for the tp-relative offset. |
1950 | Output_data_got<32, false>* got | |
1951 | = target->got_section(symtab, layout); | |
1952 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1953 | ? elfcpp::R_386_TLS_TPOFF32 | |
1954 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1955 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1956 | ? GOT_TYPE_TLS_OFFSET | |
1957 | : GOT_TYPE_TLS_NOFFSET); | |
1958 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1959 | target->rel_dyn_section(layout), |
1960 | dyn_r_type); | |
07f397ab ILT |
1961 | } |
1962 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1963 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1964 | break; |
af6359d5 | 1965 | |
56622147 ILT |
1966 | case elfcpp::R_386_TLS_LE: // Local-exec |
1967 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1968 | layout->set_has_static_tls(); |
8851ecca | 1969 | if (parameters->options().shared()) |
7bf1f802 ILT |
1970 | { |
1971 | // We need to create a dynamic relocation. | |
1972 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1973 | ? elfcpp::R_386_TLS_TPOFF32 | |
1974 | : elfcpp::R_386_TLS_TPOFF); | |
1975 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1976 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1977 | data_shndx, reloc.get_r_offset()); | |
1978 | } | |
56622147 ILT |
1979 | break; |
1980 | ||
af6359d5 ILT |
1981 | default: |
1982 | gold_unreachable(); | |
a3ad94ed ILT |
1983 | } |
1984 | } | |
92e059d8 ILT |
1985 | break; |
1986 | ||
92e059d8 ILT |
1987 | case elfcpp::R_386_32PLT: |
1988 | case elfcpp::R_386_TLS_GD_32: | |
1989 | case elfcpp::R_386_TLS_GD_PUSH: | |
1990 | case elfcpp::R_386_TLS_GD_CALL: | |
1991 | case elfcpp::R_386_TLS_GD_POP: | |
1992 | case elfcpp::R_386_TLS_LDM_32: | |
1993 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1994 | case elfcpp::R_386_TLS_LDM_CALL: | |
1995 | case elfcpp::R_386_TLS_LDM_POP: | |
1996 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1997 | default: | |
af6359d5 | 1998 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1999 | break; |
2000 | } | |
2001 | } | |
2002 | ||
6d03d481 ST |
2003 | // Process relocations for gc. |
2004 | ||
2005 | void | |
ad0f2072 | 2006 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
2007 | Layout* layout, |
2008 | Sized_relobj<32, false>* object, | |
2009 | unsigned int data_shndx, | |
2010 | unsigned int, | |
2011 | const unsigned char* prelocs, | |
2012 | size_t reloc_count, | |
2013 | Output_section* output_section, | |
2014 | bool needs_special_offset_handling, | |
2015 | size_t local_symbol_count, | |
2016 | const unsigned char* plocal_symbols) | |
2017 | { | |
2018 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2019 | Target_i386::Scan, |
2020 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2021 | symtab, |
2022 | layout, | |
2023 | this, | |
2024 | object, | |
2025 | data_shndx, | |
2026 | prelocs, | |
2027 | reloc_count, | |
2028 | output_section, | |
2029 | needs_special_offset_handling, | |
2030 | local_symbol_count, | |
2031 | plocal_symbols); | |
2032 | } | |
2033 | ||
92e059d8 ILT |
2034 | // Scan relocations for a section. |
2035 | ||
2036 | void | |
ad0f2072 | 2037 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2038 | Layout* layout, |
f6ce93d6 | 2039 | Sized_relobj<32, false>* object, |
a3ad94ed | 2040 | unsigned int data_shndx, |
92e059d8 ILT |
2041 | unsigned int sh_type, |
2042 | const unsigned char* prelocs, | |
2043 | size_t reloc_count, | |
730cdc88 ILT |
2044 | Output_section* output_section, |
2045 | bool needs_special_offset_handling, | |
92e059d8 | 2046 | size_t local_symbol_count, |
730cdc88 | 2047 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2048 | { |
2049 | if (sh_type == elfcpp::SHT_RELA) | |
2050 | { | |
75f2446e ILT |
2051 | gold_error(_("%s: unsupported RELA reloc section"), |
2052 | object->name().c_str()); | |
2053 | return; | |
92e059d8 ILT |
2054 | } |
2055 | ||
ead1e424 ILT |
2056 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2057 | Target_i386::Scan>( | |
92e059d8 | 2058 | symtab, |
ead1e424 ILT |
2059 | layout, |
2060 | this, | |
92e059d8 | 2061 | object, |
a3ad94ed | 2062 | data_shndx, |
92e059d8 ILT |
2063 | prelocs, |
2064 | reloc_count, | |
730cdc88 ILT |
2065 | output_section, |
2066 | needs_special_offset_handling, | |
92e059d8 | 2067 | local_symbol_count, |
730cdc88 | 2068 | plocal_symbols); |
92e059d8 ILT |
2069 | } |
2070 | ||
16649710 | 2071 | // Finalize the sections. |
5a6f7e2d ILT |
2072 | |
2073 | void | |
f59f41f3 DK |
2074 | Target_i386::do_finalize_sections( |
2075 | Layout* layout, | |
2076 | const Input_objects*, | |
e785ec03 | 2077 | Symbol_table* symtab) |
5a6f7e2d | 2078 | { |
ea715a34 ILT |
2079 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2080 | ? NULL | |
2081 | : this->plt_->rel_plt()); | |
2082 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2083 | this->rel_dyn_, true, false); |
16649710 ILT |
2084 | |
2085 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2086 | // relocs. | |
12c0daef ILT |
2087 | if (this->copy_relocs_.any_saved_relocs()) |
2088 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2089 | |
2090 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2091 | // the .got.plt section. | |
2092 | Symbol* sym = this->global_offset_table_; | |
2093 | if (sym != NULL) | |
2094 | { | |
2095 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2096 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2097 | } | |
5a6f7e2d ILT |
2098 | } |
2099 | ||
86849f1f ILT |
2100 | // Return whether a direct absolute static relocation needs to be applied. |
2101 | // In cases where Scan::local() or Scan::global() has created | |
2102 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2103 | // of the relocation is carried in the data, and we must not | |
2104 | // apply the static relocation. | |
2105 | ||
2106 | inline bool | |
2107 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 2108 | int ref_flags, |
031cdbed ILT |
2109 | bool is_32bit, |
2110 | Output_section* output_section) | |
86849f1f | 2111 | { |
031cdbed ILT |
2112 | // If the output section is not allocated, then we didn't call |
2113 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2114 | // the reloc here. | |
2115 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2116 | return true; | |
2117 | ||
d61c6bd4 ILT |
2118 | // For local symbols, we will have created a non-RELATIVE dynamic |
2119 | // relocation only if (a) the output is position independent, | |
2120 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2121 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2122 | if (gsym == NULL) |
8851ecca | 2123 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2124 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2125 | && !is_32bit); |
86849f1f | 2126 | |
0700cf32 ILT |
2127 | // For global symbols, we use the same helper routines used in the |
2128 | // scan pass. If we did not create a dynamic relocation, or if we | |
2129 | // created a RELATIVE dynamic relocation, we should apply the static | |
2130 | // relocation. | |
2131 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2132 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2133 | && gsym->can_use_relative_reloc(ref_flags | |
2134 | & Symbol::FUNCTION_CALL); | |
2135 | return !has_dyn || is_rel; | |
86849f1f ILT |
2136 | } |
2137 | ||
61ba1cf9 ILT |
2138 | // Perform a relocation. |
2139 | ||
ead1e424 | 2140 | inline bool |
92e059d8 | 2141 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2142 | Target_i386* target, |
ca09d69a | 2143 | Output_section* output_section, |
92e059d8 ILT |
2144 | size_t relnum, |
2145 | const elfcpp::Rel<32, false>& rel, | |
2146 | unsigned int r_type, | |
c06b7b0b | 2147 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2148 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2149 | unsigned char* view, |
2150 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2151 | section_size_type view_size) |
61ba1cf9 | 2152 | { |
ead1e424 ILT |
2153 | if (this->skip_call_tls_get_addr_) |
2154 | { | |
5efc7cd2 CC |
2155 | if ((r_type != elfcpp::R_386_PLT32 |
2156 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2157 | || gsym == NULL |
2158 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2159 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2160 | _("missing expected TLS relocation")); | |
2161 | else | |
ead1e424 | 2162 | { |
75f2446e ILT |
2163 | this->skip_call_tls_get_addr_ = false; |
2164 | return false; | |
ead1e424 | 2165 | } |
ead1e424 ILT |
2166 | } |
2167 | ||
7223e9ca ILT |
2168 | const Sized_relobj<32, false>* object = relinfo->object; |
2169 | ||
a3ad94ed | 2170 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2171 | Symbol_value<32> symval; |
436ca963 | 2172 | if (gsym != NULL |
7223e9ca ILT |
2173 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2174 | && r_type == elfcpp::R_386_32 | |
2175 | && gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF) | |
2176 | && gsym->can_use_relative_reloc(false) | |
2177 | && !gsym->is_from_dynobj() | |
2178 | && !gsym->is_undefined() | |
2179 | && !gsym->is_preemptible()) | |
2180 | { | |
2181 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2182 | // want to use the real value of the symbol, not the PLT offset. | |
2183 | } | |
2184 | else if (gsym != NULL | |
2185 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 | |
2186 | || r_type == elfcpp::R_386_PC16 | |
2187 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 2188 | { |
b8e6aad9 ILT |
2189 | symval.set_output_value(target->plt_section()->address() |
2190 | + gsym->plt_offset()); | |
2191 | psymval = &symval; | |
a3ad94ed | 2192 | } |
7223e9ca ILT |
2193 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2194 | { | |
2195 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2196 | if (object->local_has_plt_offset(r_sym)) | |
2197 | { | |
2198 | symval.set_output_value(target->plt_section()->address() | |
2199 | + object->local_plt_offset(r_sym)); | |
2200 | psymval = &symval; | |
2201 | } | |
2202 | } | |
b8e6aad9 | 2203 | |
1b64748b | 2204 | // Get the GOT offset if needed. |
96f2030e ILT |
2205 | // The GOT pointer points to the end of the GOT section. |
2206 | // We need to subtract the size of the GOT section to get | |
2207 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2208 | bool have_got_offset = false; |
2209 | unsigned int got_offset = 0; | |
2210 | switch (r_type) | |
2211 | { | |
2212 | case elfcpp::R_386_GOT32: | |
2213 | if (gsym != NULL) | |
2214 | { | |
0a65a3a7 CC |
2215 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2216 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2217 | - target->got_size()); | |
1b64748b ILT |
2218 | } |
2219 | else | |
2220 | { | |
2221 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2222 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2223 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2224 | - target->got_size()); | |
1b64748b ILT |
2225 | } |
2226 | have_got_offset = true; | |
2227 | break; | |
2228 | ||
2229 | default: | |
2230 | break; | |
2231 | } | |
2232 | ||
61ba1cf9 ILT |
2233 | switch (r_type) |
2234 | { | |
2235 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2236 | case elfcpp::R_386_GNU_VTINHERIT: |
2237 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2238 | break; |
2239 | ||
2240 | case elfcpp::R_386_32: | |
031cdbed ILT |
2241 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
2242 | output_section)) | |
86849f1f | 2243 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2244 | break; |
2245 | ||
2246 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 2247 | { |
0700cf32 | 2248 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 2249 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 2250 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 2251 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
2252 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
2253 | } | |
92e059d8 ILT |
2254 | break; |
2255 | ||
2256 | case elfcpp::R_386_16: | |
031cdbed ILT |
2257 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
2258 | output_section)) | |
86849f1f | 2259 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2260 | break; |
2261 | ||
2262 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 2263 | { |
0700cf32 | 2264 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 2265 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 2266 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 2267 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 2268 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 2269 | } |
61ba1cf9 ILT |
2270 | break; |
2271 | ||
92e059d8 | 2272 | case elfcpp::R_386_8: |
031cdbed ILT |
2273 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
2274 | output_section)) | |
86849f1f | 2275 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2276 | break; |
2277 | ||
2278 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 2279 | { |
0700cf32 | 2280 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 2281 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 2282 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed ILT |
2283 | if (should_apply_static_reloc(gsym, ref_flags, false, |
2284 | output_section)) | |
d09e9154 | 2285 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 2286 | } |
92e059d8 ILT |
2287 | break; |
2288 | ||
ead1e424 | 2289 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2290 | gold_assert(gsym == NULL |
2291 | || gsym->has_plt_offset() | |
99f8faca ILT |
2292 | || gsym->final_value_is_known() |
2293 | || (gsym->is_defined() | |
2294 | && !gsym->is_from_dynobj() | |
2295 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2296 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2297 | break; |
2298 | ||
2299 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2300 | gold_assert(have_got_offset); |
2301 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2302 | break; |
2303 | ||
2304 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2305 | { |
2306 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2307 | value = (psymval->value(object, 0) | |
96f2030e | 2308 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2309 | Relocate_functions<32, false>::rel32(view, value); |
2310 | } | |
ead1e424 ILT |
2311 | break; |
2312 | ||
2313 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2314 | { |
2315 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2316 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2317 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2318 | } | |
ead1e424 ILT |
2319 | break; |
2320 | ||
92e059d8 ILT |
2321 | case elfcpp::R_386_COPY: |
2322 | case elfcpp::R_386_GLOB_DAT: | |
2323 | case elfcpp::R_386_JUMP_SLOT: | |
2324 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2325 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2326 | // These are outstanding tls relocs, which are unexpected when |
2327 | // linking. | |
92e059d8 ILT |
2328 | case elfcpp::R_386_TLS_TPOFF: |
2329 | case elfcpp::R_386_TLS_DTPMOD32: | |
2330 | case elfcpp::R_386_TLS_DTPOFF32: | |
2331 | case elfcpp::R_386_TLS_TPOFF32: | |
2332 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2333 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2334 | _("unexpected reloc %u in object file"), | |
2335 | r_type); | |
92e059d8 ILT |
2336 | break; |
2337 | ||
d61c17ea ILT |
2338 | // These are initial tls relocs, which are expected when |
2339 | // linking. | |
56622147 ILT |
2340 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2341 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2342 | case elfcpp::R_386_TLS_DESC_CALL: | |
2343 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2344 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2345 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2346 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2347 | case elfcpp::R_386_TLS_GOTIE: |
2348 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2349 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2350 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2351 | view, address, view_size); | |
92e059d8 ILT |
2352 | break; |
2353 | ||
92e059d8 ILT |
2354 | case elfcpp::R_386_32PLT: |
2355 | case elfcpp::R_386_TLS_GD_32: | |
2356 | case elfcpp::R_386_TLS_GD_PUSH: | |
2357 | case elfcpp::R_386_TLS_GD_CALL: | |
2358 | case elfcpp::R_386_TLS_GD_POP: | |
2359 | case elfcpp::R_386_TLS_LDM_32: | |
2360 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2361 | case elfcpp::R_386_TLS_LDM_CALL: | |
2362 | case elfcpp::R_386_TLS_LDM_POP: | |
2363 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2364 | default: |
75f2446e ILT |
2365 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2366 | _("unsupported reloc %u"), | |
2367 | r_type); | |
92e059d8 ILT |
2368 | break; |
2369 | } | |
ead1e424 ILT |
2370 | |
2371 | return true; | |
92e059d8 ILT |
2372 | } |
2373 | ||
2374 | // Perform a TLS relocation. | |
2375 | ||
2376 | inline void | |
2377 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2378 | Target_i386* target, |
92e059d8 ILT |
2379 | size_t relnum, |
2380 | const elfcpp::Rel<32, false>& rel, | |
2381 | unsigned int r_type, | |
c06b7b0b | 2382 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2383 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2384 | unsigned char* view, |
2385 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2386 | section_size_type view_size) |
92e059d8 ILT |
2387 | { |
2388 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2389 | |
07f397ab ILT |
2390 | const Sized_relobj<32, false>* object = relinfo->object; |
2391 | ||
2392 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2393 | |
b3705d2a ILT |
2394 | const bool is_final = (gsym == NULL |
2395 | ? !parameters->options().shared() | |
2396 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2397 | const tls::Tls_optimization optimized_type |
2398 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2399 | switch (r_type) |
2400 | { | |
56622147 | 2401 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2402 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2403 | { |
07f397ab | 2404 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2405 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2406 | rel, r_type, value, view, | |
2407 | view_size); | |
92e059d8 ILT |
2408 | break; |
2409 | } | |
07f397ab ILT |
2410 | else |
2411 | { | |
c2b45e22 CC |
2412 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2413 | ? GOT_TYPE_TLS_NOFFSET | |
2414 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2415 | unsigned int got_offset; |
2416 | if (gsym != NULL) | |
2417 | { | |
c2b45e22 CC |
2418 | gold_assert(gsym->has_got_offset(got_type)); |
2419 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2420 | } |
2421 | else | |
2422 | { | |
2423 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2424 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2425 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2426 | - target->got_size()); |
2427 | } | |
2428 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2429 | { | |
2430 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2431 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2432 | got_offset, view, view_size); | |
07f397ab ILT |
2433 | break; |
2434 | } | |
2435 | else if (optimized_type == tls::TLSOPT_NONE) | |
2436 | { | |
2437 | // Relocate the field with the offset of the pair of GOT | |
2438 | // entries. | |
2439 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2440 | break; | |
2441 | } | |
2442 | } | |
75f2446e ILT |
2443 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2444 | _("unsupported reloc %u"), | |
2445 | r_type); | |
92e059d8 ILT |
2446 | break; |
2447 | ||
56622147 ILT |
2448 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2449 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2450 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2451 | if (optimized_type == tls::TLSOPT_TO_LE) |
2452 | { | |
2453 | gold_assert(tls_segment != NULL); | |
2454 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2455 | rel, r_type, value, view, | |
2456 | view_size); | |
2457 | break; | |
2458 | } | |
2459 | else | |
2460 | { | |
2461 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2462 | ? GOT_TYPE_TLS_NOFFSET | |
2463 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2464 | unsigned int got_offset = 0; |
2465 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2466 | && optimized_type == tls::TLSOPT_NONE) | |
2467 | { | |
2468 | // We created GOT entries in the .got.tlsdesc portion of | |
2469 | // the .got.plt section, but the offset stored in the | |
2470 | // symbol is the offset within .got.tlsdesc. | |
2471 | got_offset = (target->got_size() | |
2472 | + target->got_plt_section()->data_size()); | |
2473 | } | |
c2b45e22 CC |
2474 | if (gsym != NULL) |
2475 | { | |
2476 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2477 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2478 | } |
2479 | else | |
2480 | { | |
2481 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2482 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2483 | got_offset += (object->local_got_offset(r_sym, got_type) |
2484 | - target->got_size()); | |
c2b45e22 CC |
2485 | } |
2486 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2487 | { | |
2488 | gold_assert(tls_segment != NULL); | |
2489 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2490 | got_offset, view, view_size); | |
2491 | break; | |
2492 | } | |
2493 | else if (optimized_type == tls::TLSOPT_NONE) | |
2494 | { | |
2495 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2496 | { | |
2497 | // Relocate the field with the offset of the pair of GOT | |
2498 | // entries. | |
2499 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2500 | } | |
2501 | break; | |
2502 | } | |
2503 | } | |
75f2446e ILT |
2504 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2505 | _("unsupported reloc %u"), | |
2506 | r_type); | |
ead1e424 ILT |
2507 | break; |
2508 | ||
56622147 | 2509 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2510 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2511 | { | |
75f2446e ILT |
2512 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2513 | _("both SUN and GNU model " | |
2514 | "TLS relocations")); | |
2515 | break; | |
46cf9fa2 ILT |
2516 | } |
2517 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2518 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2519 | { |
07f397ab | 2520 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2521 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2522 | value, view, view_size); | |
2523 | break; | |
2524 | } | |
07f397ab ILT |
2525 | else if (optimized_type == tls::TLSOPT_NONE) |
2526 | { | |
2527 | // Relocate the field with the offset of the GOT entry for | |
2528 | // the module index. | |
2529 | unsigned int got_offset; | |
94c4710f ILT |
2530 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2531 | - target->got_size()); | |
07f397ab ILT |
2532 | Relocate_functions<32, false>::rel32(view, got_offset); |
2533 | break; | |
2534 | } | |
75f2446e ILT |
2535 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2536 | _("unsupported reloc %u"), | |
2537 | r_type); | |
46cf9fa2 ILT |
2538 | break; |
2539 | ||
56622147 | 2540 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2541 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2542 | { |
82bb573a ILT |
2543 | // This reloc can appear in debugging sections, in which |
2544 | // case we must not convert to local-exec. We decide what | |
2545 | // to do based on whether the section is marked as | |
2546 | // containing executable code. That is what the GNU linker | |
2547 | // does as well. | |
2548 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2549 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2550 | { |
2551 | gold_assert(tls_segment != NULL); | |
2552 | value -= tls_segment->memsz(); | |
2553 | } | |
e8a9fcda | 2554 | } |
46cf9fa2 ILT |
2555 | Relocate_functions<32, false>::rel32(view, value); |
2556 | break; | |
2557 | ||
56622147 ILT |
2558 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2559 | case elfcpp::R_386_TLS_GOTIE: | |
2560 | case elfcpp::R_386_TLS_IE_32: | |
2561 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2562 | { | |
07f397ab | 2563 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2564 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2565 | rel, r_type, value, view, | |
2566 | view_size); | |
2567 | break; | |
2568 | } | |
07f397ab ILT |
2569 | else if (optimized_type == tls::TLSOPT_NONE) |
2570 | { | |
2571 | // Relocate the field with the offset of the GOT entry for | |
2572 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2573 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2574 | ? GOT_TYPE_TLS_OFFSET | |
2575 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2576 | unsigned int got_offset; |
2577 | if (gsym != NULL) | |
2578 | { | |
c2b45e22 CC |
2579 | gold_assert(gsym->has_got_offset(got_type)); |
2580 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2581 | } |
2582 | else | |
2583 | { | |
2584 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2585 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2586 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2587 | } |
2588 | // For the R_386_TLS_IE relocation, we need to apply the | |
2589 | // absolute address of the GOT entry. | |
2590 | if (r_type == elfcpp::R_386_TLS_IE) | |
2591 | got_offset += target->got_plt_section()->address(); | |
2592 | // All GOT offsets are relative to the end of the GOT. | |
2593 | got_offset -= target->got_size(); | |
2594 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2595 | break; | |
2596 | } | |
75f2446e ILT |
2597 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2598 | _("unsupported reloc %u"), | |
2599 | r_type); | |
92e059d8 | 2600 | break; |
92e059d8 | 2601 | |
56622147 | 2602 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2603 | // If we're creating a shared library, a dynamic relocation will |
2604 | // have been created for this location, so do not apply it now. | |
8851ecca | 2605 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2606 | { |
2607 | gold_assert(tls_segment != NULL); | |
2608 | value -= tls_segment->memsz(); | |
2609 | Relocate_functions<32, false>::rel32(view, value); | |
2610 | } | |
56622147 | 2611 | break; |
92e059d8 | 2612 | |
56622147 | 2613 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2614 | // If we're creating a shared library, a dynamic relocation will |
2615 | // have been created for this location, so do not apply it now. | |
8851ecca | 2616 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2617 | { |
2618 | gold_assert(tls_segment != NULL); | |
2619 | value = tls_segment->memsz() - value; | |
2620 | Relocate_functions<32, false>::rel32(view, value); | |
2621 | } | |
56622147 | 2622 | break; |
92e059d8 | 2623 | } |
92e059d8 ILT |
2624 | } |
2625 | ||
e041f13d | 2626 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2627 | // Local-Exec. |
2628 | ||
2629 | inline void | |
2630 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2631 | size_t relnum, | |
2632 | Output_segment* tls_segment, | |
2633 | const elfcpp::Rel<32, false>& rel, | |
2634 | unsigned int, | |
2635 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2636 | unsigned char* view, | |
fe8718a4 | 2637 | section_size_type view_size) |
ead1e424 ILT |
2638 | { |
2639 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2640 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2641 | // leal foo(%reg),%eax; call ___tls_get_addr |
2642 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2643 | ||
af6359d5 ILT |
2644 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2645 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2646 | |
2647 | unsigned char op1 = view[-1]; | |
2648 | unsigned char op2 = view[-2]; | |
2649 | ||
af6359d5 ILT |
2650 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2651 | op2 == 0x8d || op2 == 0x04); | |
2652 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2653 | |
2654 | int roff = 5; | |
2655 | ||
2656 | if (op2 == 0x04) | |
2657 | { | |
af6359d5 ILT |
2658 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2659 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2660 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2661 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2662 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2663 | } | |
2664 | else | |
2665 | { | |
af6359d5 ILT |
2666 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2667 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2668 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2669 | && view[9] == 0x90) |
ead1e424 ILT |
2670 | { |
2671 | // There is a trailing nop. Use the size byte subl. | |
2672 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2673 | roff = 6; | |
2674 | } | |
2675 | else | |
2676 | { | |
2677 | // Use the five byte subl. | |
2678 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2679 | } | |
2680 | } | |
2681 | ||
7bf1f802 | 2682 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2683 | Relocate_functions<32, false>::rel32(view + roff, value); |
2684 | ||
2685 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2686 | // We can skip it. | |
2687 | this->skip_call_tls_get_addr_ = true; | |
2688 | } | |
2689 | ||
7bf1f802 | 2690 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2691 | // Initial-Exec. |
2692 | ||
2693 | inline void | |
2694 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2695 | size_t relnum, | |
c2b45e22 | 2696 | Output_segment*, |
07f397ab ILT |
2697 | const elfcpp::Rel<32, false>& rel, |
2698 | unsigned int, | |
2699 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2700 | unsigned char* view, | |
fe8718a4 | 2701 | section_size_type view_size) |
07f397ab ILT |
2702 | { |
2703 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2704 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2705 | ||
2706 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2707 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2708 | ||
2709 | unsigned char op1 = view[-1]; | |
2710 | unsigned char op2 = view[-2]; | |
2711 | ||
2712 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2713 | op2 == 0x8d || op2 == 0x04); | |
2714 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2715 | ||
2716 | int roff = 5; | |
2717 | ||
c2b45e22 CC |
2718 | // FIXME: For now, support only the first (SIB) form. |
2719 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2720 | |
2721 | if (op2 == 0x04) | |
2722 | { | |
2723 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2724 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2725 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2726 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2727 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2728 | } | |
2729 | else | |
2730 | { | |
2731 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2732 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2733 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2734 | && view[9] == 0x90) |
2735 | { | |
2736 | // FIXME: This is not the right instruction sequence. | |
2737 | // There is a trailing nop. Use the size byte subl. | |
2738 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2739 | roff = 6; | |
2740 | } | |
2741 | else | |
2742 | { | |
2743 | // FIXME: This is not the right instruction sequence. | |
2744 | // Use the five byte subl. | |
2745 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2746 | } | |
2747 | } | |
2748 | ||
07f397ab ILT |
2749 | Relocate_functions<32, false>::rel32(view + roff, value); |
2750 | ||
2751 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2752 | // We can skip it. | |
2753 | this->skip_call_tls_get_addr_ = true; | |
2754 | } | |
2755 | ||
c2b45e22 CC |
2756 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2757 | // General-Dynamic to a Local-Exec. | |
2758 | ||
2759 | inline void | |
2760 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2761 | const Relocate_info<32, false>* relinfo, | |
2762 | size_t relnum, | |
2763 | Output_segment* tls_segment, | |
2764 | const elfcpp::Rel<32, false>& rel, | |
2765 | unsigned int r_type, | |
2766 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2767 | unsigned char* view, | |
2768 | section_size_type view_size) | |
2769 | { | |
2770 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2771 | { | |
2772 | // leal foo@TLSDESC(%ebx), %eax | |
2773 | // ==> leal foo@NTPOFF, %eax | |
2774 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2775 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2776 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2777 | view[-2] == 0x8d && view[-1] == 0x83); | |
2778 | view[-1] = 0x05; | |
2779 | value -= tls_segment->memsz(); | |
2780 | Relocate_functions<32, false>::rel32(view, value); | |
2781 | } | |
2782 | else | |
2783 | { | |
2784 | // call *foo@TLSCALL(%eax) | |
2785 | // ==> nop; nop | |
2786 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2787 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2788 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2789 | view[0] == 0xff && view[1] == 0x10); | |
2790 | view[0] = 0x66; | |
2791 | view[1] = 0x90; | |
2792 | } | |
2793 | } | |
2794 | ||
2795 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2796 | // General-Dynamic to an Initial-Exec. | |
2797 | ||
2798 | inline void | |
2799 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2800 | const Relocate_info<32, false>* relinfo, | |
2801 | size_t relnum, | |
2802 | Output_segment*, | |
2803 | const elfcpp::Rel<32, false>& rel, | |
2804 | unsigned int r_type, | |
2805 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2806 | unsigned char* view, | |
2807 | section_size_type view_size) | |
2808 | { | |
2809 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2810 | { | |
2811 | // leal foo@TLSDESC(%ebx), %eax | |
2812 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2813 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2814 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2815 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2816 | view[-2] == 0x8d && view[-1] == 0x83); | |
2817 | view[-2] = 0x8b; | |
2818 | Relocate_functions<32, false>::rel32(view, value); | |
2819 | } | |
2820 | else | |
2821 | { | |
2822 | // call *foo@TLSCALL(%eax) | |
2823 | // ==> nop; nop | |
2824 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2825 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2826 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2827 | view[0] == 0xff && view[1] == 0x10); | |
2828 | view[0] = 0x66; | |
2829 | view[1] = 0x90; | |
2830 | } | |
2831 | } | |
2832 | ||
46cf9fa2 ILT |
2833 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2834 | // Local-Exec. | |
2835 | ||
2836 | inline void | |
2837 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2838 | size_t relnum, | |
2839 | Output_segment*, | |
2840 | const elfcpp::Rel<32, false>& rel, | |
2841 | unsigned int, | |
2842 | elfcpp::Elf_types<32>::Elf_Addr, | |
2843 | unsigned char* view, | |
fe8718a4 | 2844 | section_size_type view_size) |
46cf9fa2 ILT |
2845 | { |
2846 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2847 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2848 | ||
af6359d5 ILT |
2849 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2850 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2851 | |
2852 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2853 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2854 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2855 | |
af6359d5 | 2856 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2857 | |
2858 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2859 | ||
2860 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2861 | // We can skip it. | |
2862 | this->skip_call_tls_get_addr_ = true; | |
2863 | } | |
2864 | ||
56622147 ILT |
2865 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2866 | // Local-Exec. | |
2867 | ||
2868 | inline void | |
2869 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2870 | size_t relnum, | |
2871 | Output_segment* tls_segment, | |
2872 | const elfcpp::Rel<32, false>& rel, | |
2873 | unsigned int r_type, | |
2874 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2875 | unsigned char* view, | |
fe8718a4 | 2876 | section_size_type view_size) |
56622147 ILT |
2877 | { |
2878 | // We have to actually change the instructions, which means that we | |
2879 | // need to examine the opcodes to figure out which instruction we | |
2880 | // are looking at. | |
2881 | if (r_type == elfcpp::R_386_TLS_IE) | |
2882 | { | |
2883 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2884 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2885 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2886 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2887 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2888 | ||
2889 | unsigned char op1 = view[-1]; | |
2890 | if (op1 == 0xa1) | |
2891 | { | |
2892 | // movl XX,%eax ==> movl $YY,%eax | |
2893 | view[-1] = 0xb8; | |
2894 | } | |
2895 | else | |
2896 | { | |
2897 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2898 | ||
2899 | unsigned char op2 = view[-2]; | |
2900 | if (op2 == 0x8b) | |
2901 | { | |
2902 | // movl XX,%reg ==> movl $YY,%reg | |
2903 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2904 | (op1 & 0xc7) == 0x05); | |
2905 | view[-2] = 0xc7; | |
2906 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2907 | } | |
2908 | else if (op2 == 0x03) | |
2909 | { | |
2910 | // addl XX,%reg ==> addl $YY,%reg | |
2911 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2912 | (op1 & 0xc7) == 0x05); | |
2913 | view[-2] = 0x81; | |
2914 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2915 | } | |
2916 | else | |
2917 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2918 | } | |
2919 | } | |
2920 | else | |
2921 | { | |
2922 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2923 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2924 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2925 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2926 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2927 | ||
2928 | unsigned char op1 = view[-1]; | |
2929 | unsigned char op2 = view[-2]; | |
2930 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2931 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2932 | if (op2 == 0x8b) | |
2933 | { | |
2934 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2935 | view[-2] = 0xc7; | |
2936 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2937 | } | |
2938 | else if (op2 == 0x2b) | |
2939 | { | |
2940 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2941 | view[-2] = 0x81; | |
2942 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2943 | } | |
2944 | else if (op2 == 0x03) | |
2945 | { | |
2946 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2947 | view[-2] = 0x81; | |
2948 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2949 | } | |
2950 | else | |
2951 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2952 | } | |
2953 | ||
7bf1f802 | 2954 | value = tls_segment->memsz() - value; |
56622147 ILT |
2955 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2956 | value = - value; | |
2957 | ||
2958 | Relocate_functions<32, false>::rel32(view, value); | |
2959 | } | |
2960 | ||
61ba1cf9 ILT |
2961 | // Relocate section data. |
2962 | ||
2963 | void | |
92e059d8 | 2964 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2965 | unsigned int sh_type, |
2966 | const unsigned char* prelocs, | |
2967 | size_t reloc_count, | |
730cdc88 ILT |
2968 | Output_section* output_section, |
2969 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2970 | unsigned char* view, |
2971 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2972 | section_size_type view_size, |
2973 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2974 | { |
a3ad94ed | 2975 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2976 | |
ead1e424 ILT |
2977 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2978 | Target_i386::Relocate>( | |
92e059d8 | 2979 | relinfo, |
ead1e424 | 2980 | this, |
61ba1cf9 ILT |
2981 | prelocs, |
2982 | reloc_count, | |
730cdc88 ILT |
2983 | output_section, |
2984 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2985 | view, |
2986 | address, | |
364c7fa5 ILT |
2987 | view_size, |
2988 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2989 | } |
2990 | ||
6a74a719 ILT |
2991 | // Return the size of a relocation while scanning during a relocatable |
2992 | // link. | |
2993 | ||
2994 | unsigned int | |
2995 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2996 | unsigned int r_type, | |
2997 | Relobj* object) | |
2998 | { | |
2999 | switch (r_type) | |
3000 | { | |
3001 | case elfcpp::R_386_NONE: | |
3002 | case elfcpp::R_386_GNU_VTINHERIT: | |
3003 | case elfcpp::R_386_GNU_VTENTRY: | |
3004 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3005 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3006 | case elfcpp::R_386_TLS_DESC_CALL: | |
3007 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3008 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3009 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3010 | case elfcpp::R_386_TLS_IE_32: | |
3011 | case elfcpp::R_386_TLS_GOTIE: | |
3012 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3013 | case elfcpp::R_386_TLS_LE_32: | |
3014 | return 0; | |
3015 | ||
3016 | case elfcpp::R_386_32: | |
3017 | case elfcpp::R_386_PC32: | |
3018 | case elfcpp::R_386_GOT32: | |
3019 | case elfcpp::R_386_PLT32: | |
3020 | case elfcpp::R_386_GOTOFF: | |
3021 | case elfcpp::R_386_GOTPC: | |
3022 | return 4; | |
3023 | ||
3024 | case elfcpp::R_386_16: | |
3025 | case elfcpp::R_386_PC16: | |
3026 | return 2; | |
3027 | ||
3028 | case elfcpp::R_386_8: | |
3029 | case elfcpp::R_386_PC8: | |
3030 | return 1; | |
3031 | ||
3032 | // These are relocations which should only be seen by the | |
3033 | // dynamic linker, and should never be seen here. | |
3034 | case elfcpp::R_386_COPY: | |
3035 | case elfcpp::R_386_GLOB_DAT: | |
3036 | case elfcpp::R_386_JUMP_SLOT: | |
3037 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3038 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3039 | case elfcpp::R_386_TLS_TPOFF: |
3040 | case elfcpp::R_386_TLS_DTPMOD32: | |
3041 | case elfcpp::R_386_TLS_DTPOFF32: | |
3042 | case elfcpp::R_386_TLS_TPOFF32: | |
3043 | case elfcpp::R_386_TLS_DESC: | |
3044 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3045 | return 0; | |
3046 | ||
3047 | case elfcpp::R_386_32PLT: | |
3048 | case elfcpp::R_386_TLS_GD_32: | |
3049 | case elfcpp::R_386_TLS_GD_PUSH: | |
3050 | case elfcpp::R_386_TLS_GD_CALL: | |
3051 | case elfcpp::R_386_TLS_GD_POP: | |
3052 | case elfcpp::R_386_TLS_LDM_32: | |
3053 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3054 | case elfcpp::R_386_TLS_LDM_CALL: | |
3055 | case elfcpp::R_386_TLS_LDM_POP: | |
3056 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3057 | default: | |
3058 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3059 | return 0; | |
3060 | } | |
3061 | } | |
3062 | ||
3063 | // Scan the relocs during a relocatable link. | |
3064 | ||
3065 | void | |
ad0f2072 | 3066 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
3067 | Layout* layout, |
3068 | Sized_relobj<32, false>* object, | |
3069 | unsigned int data_shndx, | |
3070 | unsigned int sh_type, | |
3071 | const unsigned char* prelocs, | |
3072 | size_t reloc_count, | |
3073 | Output_section* output_section, | |
3074 | bool needs_special_offset_handling, | |
3075 | size_t local_symbol_count, | |
3076 | const unsigned char* plocal_symbols, | |
3077 | Relocatable_relocs* rr) | |
3078 | { | |
3079 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3080 | ||
3081 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3082 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3083 | ||
7019cd25 | 3084 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3085 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3086 | symtab, |
3087 | layout, | |
3088 | object, | |
3089 | data_shndx, | |
3090 | prelocs, | |
3091 | reloc_count, | |
3092 | output_section, | |
3093 | needs_special_offset_handling, | |
3094 | local_symbol_count, | |
3095 | plocal_symbols, | |
3096 | rr); | |
3097 | } | |
3098 | ||
3099 | // Relocate a section during a relocatable link. | |
3100 | ||
3101 | void | |
3102 | Target_i386::relocate_for_relocatable( | |
3103 | const Relocate_info<32, false>* relinfo, | |
3104 | unsigned int sh_type, | |
3105 | const unsigned char* prelocs, | |
3106 | size_t reloc_count, | |
3107 | Output_section* output_section, | |
3108 | off_t offset_in_output_section, | |
3109 | const Relocatable_relocs* rr, | |
3110 | unsigned char* view, | |
3111 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3112 | section_size_type view_size, | |
3113 | unsigned char* reloc_view, | |
3114 | section_size_type reloc_view_size) | |
3115 | { | |
3116 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3117 | ||
7019cd25 | 3118 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3119 | relinfo, |
3120 | prelocs, | |
3121 | reloc_count, | |
3122 | output_section, | |
3123 | offset_in_output_section, | |
3124 | rr, | |
3125 | view, | |
3126 | view_address, | |
3127 | view_size, | |
3128 | reloc_view, | |
3129 | reloc_view_size); | |
3130 | } | |
3131 | ||
ab5c9e90 ILT |
3132 | // Return the value to use for a dynamic which requires special |
3133 | // treatment. This is how we support equality comparisons of function | |
3134 | // pointers across shared library boundaries, as described in the | |
3135 | // processor specific ABI supplement. | |
3136 | ||
3137 | uint64_t | |
3138 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3139 | { | |
3140 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3141 | return this->plt_section()->address() + gsym->plt_offset(); | |
3142 | } | |
3143 | ||
c51e6221 ILT |
3144 | // Return a string used to fill a code section with nops to take up |
3145 | // the specified length. | |
3146 | ||
3147 | std::string | |
8851ecca | 3148 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3149 | { |
3150 | if (length >= 16) | |
3151 | { | |
3152 | // Build a jmp instruction to skip over the bytes. | |
3153 | unsigned char jmp[5]; | |
3154 | jmp[0] = 0xe9; | |
3155 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3156 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3157 | + std::string(length - 5, '\0')); | |
3158 | } | |
3159 | ||
3160 | // Nop sequences of various lengths. | |
3161 | const char nop1[1] = { 0x90 }; // nop | |
3162 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3163 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3164 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3165 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3166 | 0x00 }; // leal 0(%esi,1),%esi | |
3167 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3168 | 0x00, 0x00 }; | |
3169 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3170 | 0x00, 0x00, 0x00 }; | |
3171 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3172 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3173 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3174 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3175 | 0x00 }; | |
3176 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3177 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3178 | 0x00, 0x00 }; | |
3179 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3180 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3181 | 0x00, 0x00, 0x00 }; | |
3182 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3183 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3184 | 0x00, 0x00, 0x00, 0x00 }; | |
3185 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3186 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3187 | 0x27, 0x00, 0x00, 0x00, | |
3188 | 0x00 }; | |
3189 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3190 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3191 | 0xbc, 0x27, 0x00, 0x00, | |
3192 | 0x00, 0x00 }; | |
3193 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3194 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3195 | 0x90, 0x90, 0x90, 0x90, | |
3196 | 0x90, 0x90, 0x90 }; | |
3197 | ||
3198 | const char* nops[16] = { | |
3199 | NULL, | |
3200 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3201 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3202 | }; | |
3203 | ||
3204 | return std::string(nops[length], length); | |
3205 | } | |
3206 | ||
b6848d3c ILT |
3207 | // Return whether SYM should be treated as a call to a non-split |
3208 | // function. We don't want that to be true of a call to a | |
3209 | // get_pc_thunk function. | |
3210 | ||
3211 | bool | |
3212 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3213 | { | |
3214 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3215 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3216 | } | |
3217 | ||
364c7fa5 ILT |
3218 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
3219 | // compiled with -fstack-split. The function calls non-stack-split | |
3220 | // code. We have to change the function so that it always ensures | |
3221 | // that it has enough stack space to run some random function. | |
3222 | ||
3223 | void | |
3224 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3225 | section_offset_type fnoffset, | |
3226 | section_size_type fnsize, | |
3227 | unsigned char* view, | |
3228 | section_size_type view_size, | |
3229 | std::string* from, | |
3230 | std::string* to) const | |
3231 | { | |
3232 | // The function starts with a comparison of the stack pointer and a | |
3233 | // field in the TCB. This is followed by a jump. | |
3234 | ||
3235 | // cmp %gs:NN,%esp | |
3236 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3237 | && fnsize > 7) | |
3238 | { | |
3239 | // We will call __morestack if the carry flag is set after this | |
3240 | // comparison. We turn the comparison into an stc instruction | |
3241 | // and some nops. | |
3242 | view[fnoffset] = '\xf9'; | |
3243 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3244 | } | |
3245 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3246 | // lea NN(%esp),%edx |
3247 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3248 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3249 | && fnsize > 7) |
3250 | { | |
3251 | // This is loading an offset from the stack pointer for a | |
3252 | // comparison. The offset is negative, so we decrease the | |
3253 | // offset by the amount of space we need for the stack. This | |
3254 | // means we will avoid calling __morestack if there happens to | |
3255 | // be plenty of space on the stack already. | |
3256 | unsigned char* pval = view + fnoffset + 3; | |
3257 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3258 | val -= parameters->options().split_stack_adjust_size(); | |
3259 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3260 | } | |
3261 | else | |
3262 | { | |
3263 | if (!object->has_no_split_stack()) | |
3264 | object->error(_("failed to match split-stack sequence at " | |
3265 | "section %u offset %0zx"), | |
ac33a407 | 3266 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3267 | return; |
3268 | } | |
3269 | ||
3270 | // We have to change the function so that it calls | |
3271 | // __morestack_non_split instead of __morestack. The former will | |
3272 | // allocate additional stack space. | |
3273 | *from = "__morestack"; | |
3274 | *to = "__morestack_non_split"; | |
3275 | } | |
3276 | ||
14bfc3f5 ILT |
3277 | // The selector for i386 object files. |
3278 | ||
36959681 | 3279 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3280 | { |
3281 | public: | |
3282 | Target_selector_i386() | |
36959681 ILT |
3283 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
3284 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
3285 | { } |
3286 | ||
3287 | Target* | |
e96caa79 ILT |
3288 | do_instantiate_target() |
3289 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3290 | }; |
3291 | ||
14bfc3f5 ILT |
3292 | Target_selector_i386 target_selector_i386; |
3293 | ||
3294 | } // End anonymous namespace. |