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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 | ||
c95e9f27 ST |
178 | virtual bool |
179 | can_icf_inline_merge_sections () const | |
180 | { return true; } | |
181 | ||
6d03d481 ST |
182 | // Process the relocations to determine unreferenced sections for |
183 | // garbage collection. | |
184 | void | |
ad0f2072 | 185 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
186 | Layout* layout, |
187 | Sized_relobj<32, false>* object, | |
188 | unsigned int data_shndx, | |
189 | unsigned int sh_type, | |
190 | const unsigned char* prelocs, | |
191 | size_t reloc_count, | |
192 | Output_section* output_section, | |
193 | bool needs_special_offset_handling, | |
194 | size_t local_symbol_count, | |
195 | const unsigned char* plocal_symbols); | |
196 | ||
92e059d8 | 197 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 198 | void |
ad0f2072 | 199 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 200 | Layout* layout, |
f6ce93d6 | 201 | Sized_relobj<32, false>* object, |
a3ad94ed | 202 | unsigned int data_shndx, |
92e059d8 ILT |
203 | unsigned int sh_type, |
204 | const unsigned char* prelocs, | |
205 | size_t reloc_count, | |
730cdc88 ILT |
206 | Output_section* output_section, |
207 | bool needs_special_offset_handling, | |
92e059d8 | 208 | size_t local_symbol_count, |
730cdc88 | 209 | const unsigned char* plocal_symbols); |
61ba1cf9 | 210 | |
5a6f7e2d ILT |
211 | // Finalize the sections. |
212 | void | |
f59f41f3 | 213 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 214 | |
ab5c9e90 ILT |
215 | // Return the value to use for a dynamic which requires special |
216 | // treatment. | |
217 | uint64_t | |
218 | do_dynsym_value(const Symbol*) const; | |
219 | ||
92e059d8 ILT |
220 | // Relocate a section. |
221 | void | |
222 | relocate_section(const Relocate_info<32, false>*, | |
223 | unsigned int sh_type, | |
224 | const unsigned char* prelocs, | |
225 | size_t reloc_count, | |
730cdc88 ILT |
226 | Output_section* output_section, |
227 | bool needs_special_offset_handling, | |
92e059d8 ILT |
228 | unsigned char* view, |
229 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
230 | section_size_type view_size, |
231 | const Reloc_symbol_changes*); | |
92e059d8 | 232 | |
6a74a719 ILT |
233 | // Scan the relocs during a relocatable link. |
234 | void | |
ad0f2072 | 235 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
236 | Layout* layout, |
237 | Sized_relobj<32, false>* object, | |
238 | unsigned int data_shndx, | |
239 | unsigned int sh_type, | |
240 | const unsigned char* prelocs, | |
241 | size_t reloc_count, | |
242 | Output_section* output_section, | |
243 | bool needs_special_offset_handling, | |
244 | size_t local_symbol_count, | |
245 | const unsigned char* plocal_symbols, | |
246 | Relocatable_relocs*); | |
247 | ||
248 | // Relocate a section during a relocatable link. | |
249 | void | |
250 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
251 | unsigned int sh_type, | |
252 | const unsigned char* prelocs, | |
253 | size_t reloc_count, | |
254 | Output_section* output_section, | |
255 | off_t offset_in_output_section, | |
256 | const Relocatable_relocs*, | |
257 | unsigned char* view, | |
258 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
259 | section_size_type view_size, | |
260 | unsigned char* reloc_view, | |
261 | section_size_type reloc_view_size); | |
262 | ||
c51e6221 ILT |
263 | // Return a string used to fill a code section with nops. |
264 | std::string | |
8851ecca | 265 | do_code_fill(section_size_type length) const; |
c51e6221 | 266 | |
9a2d6984 ILT |
267 | // Return whether SYM is defined by the ABI. |
268 | bool | |
9c2d0ef9 | 269 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
270 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
271 | ||
bb04269c DK |
272 | // Return whether a symbol name implies a local label. The UnixWare |
273 | // 2.1 cc generates temporary symbols that start with .X, so we | |
274 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
275 | // If so, we should move the .X recognition into | |
276 | // Target::do_is_local_label_name. | |
277 | bool | |
278 | do_is_local_label_name(const char* name) const | |
279 | { | |
280 | if (name[0] == '.' && name[1] == 'X') | |
281 | return true; | |
282 | return Target::do_is_local_label_name(name); | |
283 | } | |
284 | ||
7223e9ca ILT |
285 | // Return the PLT section. |
286 | Output_data* | |
287 | do_plt_section_for_global(const Symbol*) const | |
288 | { return this->plt_section(); } | |
289 | ||
290 | Output_data* | |
291 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
292 | { return this->plt_section(); } | |
293 | ||
b6848d3c ILT |
294 | // Return whether SYM is call to a non-split function. |
295 | bool | |
296 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
297 | ||
364c7fa5 ILT |
298 | // Adjust -fstack-split code which calls non-stack-split code. |
299 | void | |
300 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
301 | section_offset_type fnoffset, section_size_type fnsize, | |
302 | unsigned char* view, section_size_type view_size, | |
303 | std::string* from, std::string* to) const; | |
304 | ||
96f2030e | 305 | // Return the size of the GOT section. |
fe8718a4 | 306 | section_size_type |
0e70b911 | 307 | got_size() const |
96f2030e ILT |
308 | { |
309 | gold_assert(this->got_ != NULL); | |
310 | return this->got_->data_size(); | |
311 | } | |
312 | ||
0e70b911 CC |
313 | // Return the number of entries in the GOT. |
314 | unsigned int | |
315 | got_entry_count() const | |
316 | { | |
317 | if (this->got_ == NULL) | |
318 | return 0; | |
319 | return this->got_size() / 4; | |
320 | } | |
321 | ||
322 | // Return the number of entries in the PLT. | |
323 | unsigned int | |
324 | plt_entry_count() const; | |
325 | ||
326 | // Return the offset of the first non-reserved PLT entry. | |
327 | unsigned int | |
328 | first_plt_entry_offset() const; | |
329 | ||
330 | // Return the size of each PLT entry. | |
331 | unsigned int | |
332 | plt_entry_size() const; | |
333 | ||
92e059d8 ILT |
334 | private: |
335 | // The class which scans relocations. | |
336 | struct Scan | |
61ba1cf9 | 337 | { |
95a2c8d6 RS |
338 | static inline int |
339 | ||
340 | get_reference_flags(unsigned int r_type); | |
341 | ||
61ba1cf9 | 342 | inline void |
ad0f2072 | 343 | local(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 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 349 | |
92e059d8 | 350 | inline void |
ad0f2072 | 351 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 352 | Sized_relobj<32, false>* object, |
a3ad94ed | 353 | unsigned int data_shndx, |
07f397ab | 354 | Output_section* output_section, |
92e059d8 ILT |
355 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
356 | Symbol* gsym); | |
af6359d5 | 357 | |
21bb3914 | 358 | inline bool |
0897ed3b ST |
359 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
360 | Target_i386* target, | |
361 | Sized_relobj<32, false>* object, | |
362 | unsigned int data_shndx, | |
363 | Output_section* output_section, | |
364 | const elfcpp::Rel<32, false>& reloc, | |
365 | unsigned int r_type, | |
366 | const elfcpp::Sym<32, false>& lsym); | |
367 | ||
368 | inline bool | |
369 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
370 | Target_i386* target, | |
371 | Sized_relobj<32, false>* object, | |
372 | unsigned int data_shndx, | |
373 | Output_section* output_section, | |
374 | const elfcpp::Rel<32, false>& reloc, | |
375 | unsigned int r_type, | |
376 | Symbol* gsym); | |
21bb3914 ST |
377 | |
378 | inline bool | |
0897ed3b | 379 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 380 | |
7223e9ca ILT |
381 | bool |
382 | reloc_needs_plt_for_ifunc(Sized_relobj<32, false>*, unsigned int r_type); | |
383 | ||
af6359d5 ILT |
384 | static void |
385 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
386 | ||
387 | static void | |
388 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
389 | Symbol*); | |
61ba1cf9 ILT |
390 | }; |
391 | ||
92e059d8 ILT |
392 | // The class which implements relocation. |
393 | class Relocate | |
394 | { | |
395 | public: | |
ead1e424 | 396 | Relocate() |
46cf9fa2 | 397 | : skip_call_tls_get_addr_(false), |
82bb573a | 398 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
399 | { } |
400 | ||
401 | ~Relocate() | |
402 | { | |
403 | if (this->skip_call_tls_get_addr_) | |
404 | { | |
405 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 406 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
407 | } |
408 | } | |
409 | ||
86849f1f ILT |
410 | // Return whether the static relocation needs to be applied. |
411 | inline bool | |
412 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 413 | unsigned int r_type, |
031cdbed ILT |
414 | bool is_32bit, |
415 | Output_section* output_section); | |
86849f1f | 416 | |
ead1e424 ILT |
417 | // Do a relocation. Return false if the caller should not issue |
418 | // any warnings about this relocation. | |
419 | inline bool | |
031cdbed ILT |
420 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
421 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 422 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 423 | const Symbol_value<32>*, |
92e059d8 | 424 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 425 | section_size_type); |
92e059d8 ILT |
426 | |
427 | private: | |
428 | // Do a TLS relocation. | |
ead1e424 | 429 | inline void |
07f397ab ILT |
430 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
431 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 432 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 433 | const Symbol_value<32>*, |
fe8718a4 ILT |
434 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
435 | section_size_type); | |
92e059d8 | 436 | |
07f397ab ILT |
437 | // Do a TLS General-Dynamic to Initial-Exec transition. |
438 | inline void | |
439 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
440 | Output_segment* tls_segment, | |
441 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
442 | elfcpp::Elf_types<32>::Elf_Addr value, | |
443 | unsigned char* view, | |
fe8718a4 | 444 | section_size_type view_size); |
07f397ab | 445 | |
56622147 ILT |
446 | // Do a TLS General-Dynamic to Local-Exec transition. |
447 | inline void | |
448 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
449 | Output_segment* tls_segment, |
450 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
451 | elfcpp::Elf_types<32>::Elf_Addr value, | |
452 | unsigned char* view, | |
fe8718a4 | 453 | section_size_type view_size); |
92e059d8 | 454 | |
c2b45e22 CC |
455 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
456 | // transition. | |
457 | inline void | |
458 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
459 | Output_segment* tls_segment, | |
460 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
461 | elfcpp::Elf_types<32>::Elf_Addr value, | |
462 | unsigned char* view, | |
463 | section_size_type view_size); | |
464 | ||
465 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
466 | // transition. | |
467 | inline void | |
468 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
469 | Output_segment* tls_segment, | |
470 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
471 | elfcpp::Elf_types<32>::Elf_Addr value, | |
472 | unsigned char* view, | |
473 | section_size_type view_size); | |
474 | ||
56622147 | 475 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 476 | inline void |
56622147 | 477 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
478 | Output_segment* tls_segment, |
479 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
480 | elfcpp::Elf_types<32>::Elf_Addr value, | |
481 | unsigned char* view, | |
fe8718a4 | 482 | section_size_type view_size); |
ead1e424 | 483 | |
56622147 ILT |
484 | // Do a TLS Initial-Exec to Local-Exec transition. |
485 | static inline void | |
486 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
487 | Output_segment* tls_segment, |
488 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
489 | elfcpp::Elf_types<32>::Elf_Addr value, | |
490 | unsigned char* view, | |
fe8718a4 | 491 | section_size_type view_size); |
46cf9fa2 | 492 | |
46cf9fa2 ILT |
493 | // We need to keep track of which type of local dynamic relocation |
494 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
495 | enum Local_dynamic_type | |
496 | { | |
497 | LOCAL_DYNAMIC_NONE, | |
498 | LOCAL_DYNAMIC_SUN, | |
499 | LOCAL_DYNAMIC_GNU | |
500 | }; | |
501 | ||
ead1e424 ILT |
502 | // This is set if we should skip the next reloc, which should be a |
503 | // PLT32 reloc against ___tls_get_addr. | |
504 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
505 | // The type of local dynamic relocation we have seen in the section |
506 | // being relocated, if any. | |
507 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
508 | }; |
509 | ||
6a74a719 ILT |
510 | // A class which returns the size required for a relocation type, |
511 | // used while scanning relocs during a relocatable link. | |
512 | class Relocatable_size_for_reloc | |
513 | { | |
514 | public: | |
515 | unsigned int | |
516 | get_size_for_reloc(unsigned int, Relobj*); | |
517 | }; | |
518 | ||
92e059d8 ILT |
519 | // Adjust TLS relocation type based on the options and whether this |
520 | // is a local symbol. | |
af6359d5 | 521 | static tls::Tls_optimization |
7e1edb90 | 522 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 523 | |
ead1e424 | 524 | // Get the GOT section, creating it if necessary. |
dbe717ef | 525 | Output_data_got<32, false>* |
7e1edb90 | 526 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 527 | |
96f2030e ILT |
528 | // Get the GOT PLT section. |
529 | Output_data_space* | |
530 | got_plt_section() const | |
531 | { | |
532 | gold_assert(this->got_plt_ != NULL); | |
533 | return this->got_plt_; | |
534 | } | |
535 | ||
a8df5856 ILT |
536 | // Get the GOT section for TLSDESC entries. |
537 | Output_data_got<32, false>* | |
538 | got_tlsdesc_section() const | |
539 | { | |
540 | gold_assert(this->got_tlsdesc_ != NULL); | |
541 | return this->got_tlsdesc_; | |
542 | } | |
543 | ||
7223e9ca ILT |
544 | // Create the PLT section. |
545 | void | |
546 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
547 | ||
a3ad94ed ILT |
548 | // Create a PLT entry for a global symbol. |
549 | void | |
7e1edb90 | 550 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 551 | |
7223e9ca ILT |
552 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
553 | void | |
554 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
555 | Sized_relobj<32, false>* relobj, | |
556 | unsigned int local_sym_index); | |
557 | ||
9fa33bee | 558 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
559 | void |
560 | define_tls_base_symbol(Symbol_table*, Layout*); | |
561 | ||
94c4710f ILT |
562 | // Create a GOT entry for the TLS module index. |
563 | unsigned int | |
564 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
565 | Sized_relobj<32, false>* object); | |
566 | ||
a3ad94ed | 567 | // Get the PLT section. |
e291e7b9 | 568 | Output_data_plt_i386* |
a3ad94ed ILT |
569 | plt_section() const |
570 | { | |
571 | gold_assert(this->plt_ != NULL); | |
572 | return this->plt_; | |
573 | } | |
574 | ||
5a6f7e2d ILT |
575 | // Get the dynamic reloc section, creating it if necessary. |
576 | Reloc_section* | |
577 | rel_dyn_section(Layout*); | |
578 | ||
e291e7b9 ILT |
579 | // Get the section to use for TLS_DESC relocations. |
580 | Reloc_section* | |
581 | rel_tls_desc_section(Layout*) const; | |
582 | ||
12c0daef | 583 | // Add a potential copy relocation. |
a3ad94ed | 584 | void |
ef9beddf ILT |
585 | copy_reloc(Symbol_table* symtab, Layout* layout, |
586 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
587 | unsigned int shndx, Output_section* output_section, |
588 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
589 | { | |
590 | this->copy_relocs_.copy_reloc(symtab, layout, | |
591 | symtab->get_sized_symbol<32>(sym), | |
592 | object, shndx, output_section, reloc, | |
593 | this->rel_dyn_section(layout)); | |
594 | } | |
ead1e424 | 595 | |
92e059d8 ILT |
596 | // Information about this specific target which we pass to the |
597 | // general Target structure. | |
75f65a3e | 598 | static const Target::Target_info i386_info; |
ead1e424 | 599 | |
0a65a3a7 | 600 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
601 | // These values are exposed to the ABI in an incremental link. |
602 | // Do not renumber existing values without changing the version | |
603 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
604 | enum Got_type |
605 | { | |
606 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
607 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
608 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
609 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
610 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
611 | }; |
612 | ||
ead1e424 | 613 | // The GOT section. |
dbe717ef | 614 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
615 | // The PLT section. |
616 | Output_data_plt_i386* plt_; | |
617 | // The GOT PLT section. | |
618 | Output_data_space* got_plt_; | |
a8df5856 ILT |
619 | // The GOT section for TLSDESC relocations. |
620 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
621 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
622 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
623 | // The dynamic reloc section. |
624 | Reloc_section* rel_dyn_; | |
625 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 626 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
627 | // Space for variables copied with a COPY reloc. |
628 | Output_data_space* dynbss_; | |
c2b45e22 | 629 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 630 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
631 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
632 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
633 | }; |
634 | ||
635 | const Target::Target_info Target_i386::i386_info = | |
636 | { | |
61ba1cf9 ILT |
637 | 32, // size |
638 | false, // is_big_endian | |
639 | elfcpp::EM_386, // machine_code | |
640 | false, // has_make_symbol | |
dbe717ef | 641 | false, // has_resolve |
c51e6221 | 642 | true, // has_code_fill |
35cdfc9a | 643 | true, // is_default_stack_executable |
0864d551 | 644 | '\0', // wrap_char |
dbe717ef | 645 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 646 | 0x08048000, // default_text_segment_address |
cd72c291 | 647 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
648 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
649 | elfcpp::SHN_UNDEF, // small_common_shndx | |
650 | elfcpp::SHN_UNDEF, // large_common_shndx | |
651 | 0, // small_common_section_flags | |
05a352e6 DK |
652 | 0, // large_common_section_flags |
653 | NULL, // attributes_section | |
654 | NULL // attributes_vendor | |
14bfc3f5 ILT |
655 | }; |
656 | ||
ead1e424 ILT |
657 | // Get the GOT section, creating it if necessary. |
658 | ||
dbe717ef | 659 | Output_data_got<32, false>* |
7e1edb90 | 660 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
661 | { |
662 | if (this->got_ == NULL) | |
663 | { | |
7e1edb90 | 664 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 665 | |
7e1edb90 | 666 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 667 | |
82742395 ILT |
668 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
669 | (elfcpp::SHF_ALLOC | |
670 | | elfcpp::SHF_WRITE), | |
22f0da72 | 671 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 672 | |
7d9e3d98 | 673 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
674 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
675 | (elfcpp::SHF_ALLOC | |
676 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
677 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
678 | false); | |
a3ad94ed | 679 | |
ead1e424 | 680 | // The first three entries are reserved. |
27bc2bce | 681 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 682 | |
1a2dff53 ILT |
683 | // Those bytes can go into the relro segment. |
684 | layout->increase_relro(3 * 4); | |
685 | ||
a3ad94ed | 686 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
687 | this->global_offset_table_ = |
688 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
689 | Symbol_table::PREDEFINED, | |
690 | this->got_plt_, | |
691 | 0, 0, elfcpp::STT_OBJECT, | |
692 | elfcpp::STB_LOCAL, | |
693 | elfcpp::STV_HIDDEN, 0, | |
694 | false, false); | |
a8df5856 ILT |
695 | |
696 | // If there are any TLSDESC relocations, they get GOT entries in | |
697 | // .got.plt after the jump slot entries. | |
698 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
699 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
700 | (elfcpp::SHF_ALLOC | |
701 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
702 | this->got_tlsdesc_, |
703 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 704 | } |
a3ad94ed | 705 | |
ead1e424 ILT |
706 | return this->got_; |
707 | } | |
708 | ||
5a6f7e2d ILT |
709 | // Get the dynamic reloc section, creating it if necessary. |
710 | ||
711 | Target_i386::Reloc_section* | |
712 | Target_i386::rel_dyn_section(Layout* layout) | |
713 | { | |
714 | if (this->rel_dyn_ == NULL) | |
715 | { | |
716 | gold_assert(layout != NULL); | |
d98bc257 | 717 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 718 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
719 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
720 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
721 | } |
722 | return this->rel_dyn_; | |
723 | } | |
724 | ||
a3ad94ed ILT |
725 | // Create the PLT section. The ordinary .got section is an argument, |
726 | // since we need to refer to the start. We also create our own .got | |
727 | // section just for PLT entries. | |
728 | ||
7223e9ca ILT |
729 | Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab, |
730 | Layout* layout, | |
7e1edb90 | 731 | Output_data_space* got_plt) |
7223e9ca ILT |
732 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0), |
733 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 734 | { |
d98bc257 | 735 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 736 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
737 | elfcpp::SHF_ALLOC, this->rel_, |
738 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
739 | |
740 | if (parameters->doing_static_link()) | |
741 | { | |
742 | // A statically linked executable will only have a .rel.plt | |
743 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
744 | // symbols. The library will use these symbols to locate the | |
745 | // IRELATIVE relocs at program startup time. | |
746 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
747 | Symbol_table::PREDEFINED, | |
748 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
749 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
750 | 0, false, true); | |
751 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
752 | Symbol_table::PREDEFINED, | |
753 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
754 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
755 | 0, true, true); | |
756 | } | |
a3ad94ed ILT |
757 | } |
758 | ||
16649710 ILT |
759 | void |
760 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
761 | { | |
762 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
763 | // linker, and so do we. | |
764 | os->set_entsize(4); | |
765 | } | |
766 | ||
a3ad94ed ILT |
767 | // Add an entry to the PLT. |
768 | ||
769 | void | |
770 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
771 | { | |
772 | gold_assert(!gsym->has_plt_offset()); | |
773 | ||
774 | // Note that when setting the PLT offset we skip the initial | |
775 | // reserved PLT entry. | |
776 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
777 | ||
778 | ++this->count_; | |
779 | ||
fe8718a4 | 780 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
781 | |
782 | // Every PLT entry needs a GOT entry which points back to the PLT | |
783 | // entry (this will be changed by the dynamic linker, normally | |
784 | // lazily when the function is called). | |
27bc2bce | 785 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
786 | |
787 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
788 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
789 | && gsym->can_use_relative_reloc(false)) | |
790 | { | |
791 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
792 | this->got_plt_, got_offset); | |
793 | struct Global_ifunc gi; | |
794 | gi.sym = gsym; | |
795 | gi.got_offset = got_offset; | |
796 | this->global_ifuncs_.push_back(gi); | |
797 | } | |
798 | else | |
799 | { | |
800 | gsym->set_needs_dynsym_entry(); | |
801 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
802 | got_offset); | |
803 | } | |
a3ad94ed ILT |
804 | |
805 | // Note that we don't need to save the symbol. The contents of the | |
806 | // PLT are independent of which symbols are used. The symbols only | |
807 | // appear in the relocations. | |
808 | } | |
809 | ||
7223e9ca ILT |
810 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
811 | // the PLT offset. | |
812 | ||
813 | unsigned int | |
814 | Output_data_plt_i386::add_local_ifunc_entry(Sized_relobj<32, false>* relobj, | |
815 | unsigned int local_sym_index) | |
816 | { | |
817 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
818 | ++this->count_; | |
819 | ||
820 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
821 | ||
822 | // Every PLT entry needs a GOT entry which points back to the PLT | |
823 | // entry. | |
824 | this->got_plt_->set_current_data_size(got_offset + 4); | |
825 | ||
826 | // Every PLT entry needs a reloc. | |
827 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
828 | elfcpp::R_386_IRELATIVE, | |
829 | this->got_plt_, got_offset); | |
830 | ||
831 | struct Local_ifunc li; | |
832 | li.object = relobj; | |
833 | li.local_sym_index = local_sym_index; | |
834 | li.got_offset = got_offset; | |
835 | this->local_ifuncs_.push_back(li); | |
836 | ||
837 | return plt_offset; | |
838 | } | |
839 | ||
e291e7b9 ILT |
840 | // Return where the TLS_DESC relocations should go, creating it if |
841 | // necessary. These follow the JUMP_SLOT relocations. | |
842 | ||
843 | Output_data_plt_i386::Reloc_section* | |
844 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
845 | { | |
846 | if (this->tls_desc_rel_ == NULL) | |
847 | { | |
848 | this->tls_desc_rel_ = new Reloc_section(false); | |
849 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
850 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 851 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
852 | gold_assert(this->tls_desc_rel_->output_section() == |
853 | this->rel_->output_section()); | |
854 | } | |
855 | return this->tls_desc_rel_; | |
856 | } | |
857 | ||
a3ad94ed ILT |
858 | // The first entry in the PLT for an executable. |
859 | ||
860 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
861 | { | |
862 | 0xff, 0x35, // pushl contents of memory address | |
863 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
864 | 0xff, 0x25, // jmp indirect | |
865 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
866 | 0, 0, 0, 0 // unused | |
867 | }; | |
868 | ||
869 | // The first entry in the PLT for a shared object. | |
870 | ||
871 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
872 | { | |
873 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
874 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
875 | 0, 0, 0, 0 // unused | |
876 | }; | |
877 | ||
878 | // Subsequent entries in the PLT for an executable. | |
879 | ||
880 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
881 | { | |
882 | 0xff, 0x25, // jmp indirect | |
883 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
884 | 0x68, // pushl immediate | |
885 | 0, 0, 0, 0, // replaced with offset into relocation table | |
886 | 0xe9, // jmp relative | |
887 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
888 | }; | |
889 | ||
890 | // Subsequent entries in the PLT for a shared object. | |
891 | ||
892 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
893 | { | |
894 | 0xff, 0xa3, // jmp *offset(%ebx) | |
895 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
896 | 0x68, // pushl immediate | |
897 | 0, 0, 0, 0, // replaced with offset into relocation table | |
898 | 0xe9, // jmp relative | |
899 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
900 | }; | |
901 | ||
902 | // Write out the PLT. This uses the hand-coded instructions above, | |
903 | // and adjusts them as needed. This is all specified by the i386 ELF | |
904 | // Processor Supplement. | |
905 | ||
906 | void | |
907 | Output_data_plt_i386::do_write(Output_file* of) | |
908 | { | |
2ea97941 | 909 | const off_t offset = this->offset(); |
fe8718a4 ILT |
910 | const section_size_type oview_size = |
911 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 912 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
913 | |
914 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
915 | const section_size_type got_size = |
916 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
917 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
918 | got_size); | |
919 | ||
920 | unsigned char* pov = oview; | |
921 | ||
922 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
923 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
924 | ||
374ad285 | 925 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
926 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
927 | else | |
928 | { | |
929 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
930 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
931 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
932 | } | |
933 | pov += plt_entry_size; | |
934 | ||
935 | unsigned char* got_pov = got_view; | |
936 | ||
937 | memset(got_pov, 0, 12); | |
938 | got_pov += 12; | |
939 | ||
940 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
941 | ||
942 | unsigned int plt_offset = plt_entry_size; | |
943 | unsigned int plt_rel_offset = 0; | |
944 | unsigned int got_offset = 12; | |
945 | const unsigned int count = this->count_; | |
946 | for (unsigned int i = 0; | |
947 | i < count; | |
948 | ++i, | |
949 | pov += plt_entry_size, | |
950 | got_pov += 4, | |
951 | plt_offset += plt_entry_size, | |
952 | plt_rel_offset += rel_size, | |
953 | got_offset += 4) | |
954 | { | |
955 | // Set and adjust the PLT entry itself. | |
956 | ||
374ad285 | 957 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
958 | { |
959 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
960 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
961 | } | |
962 | else | |
963 | { | |
964 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
965 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
966 | (got_address | |
967 | + got_offset)); | |
968 | } | |
969 | ||
970 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
971 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
972 | - (plt_offset + plt_entry_size)); | |
973 | ||
974 | // Set the entry in the GOT. | |
975 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
976 | } | |
977 | ||
7223e9ca ILT |
978 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
979 | // the GOT to point to the actual symbol value, rather than point to | |
980 | // the PLT entry. That will let the dynamic linker call the right | |
981 | // function when resolving IRELATIVE relocations. | |
982 | for (std::vector<Global_ifunc>::const_iterator p = | |
983 | this->global_ifuncs_.begin(); | |
984 | p != this->global_ifuncs_.end(); | |
985 | ++p) | |
986 | { | |
987 | const Sized_symbol<32>* ssym = | |
988 | static_cast<const Sized_symbol<32>*>(p->sym); | |
989 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
990 | ssym->value()); | |
991 | } | |
992 | ||
993 | for (std::vector<Local_ifunc>::const_iterator p = | |
994 | this->local_ifuncs_.begin(); | |
995 | p != this->local_ifuncs_.end(); | |
996 | ++p) | |
997 | { | |
998 | const Symbol_value<32>* psymval = | |
999 | p->object->local_symbol(p->local_sym_index); | |
1000 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
1001 | psymval->value(p->object, 0)); | |
1002 | } | |
1003 | ||
fe8718a4 ILT |
1004 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1005 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1006 | |
2ea97941 | 1007 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1008 | of->write_output_view(got_file_offset, got_size, got_view); |
1009 | } | |
1010 | ||
7223e9ca | 1011 | // Create the PLT section. |
a3ad94ed ILT |
1012 | |
1013 | void | |
7223e9ca | 1014 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1015 | { |
a3ad94ed ILT |
1016 | if (this->plt_ == NULL) |
1017 | { | |
1018 | // Create the GOT sections first. | |
7e1edb90 | 1019 | this->got_section(symtab, layout); |
a3ad94ed | 1020 | |
7223e9ca | 1021 | this->plt_ = new Output_data_plt_i386(symtab, layout, this->got_plt_); |
16649710 ILT |
1022 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1023 | (elfcpp::SHF_ALLOC | |
1024 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1025 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1026 | |
1027 | // Make the sh_info field of .rel.plt point to .plt. | |
1028 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1029 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1030 | } |
7223e9ca | 1031 | } |
a3ad94ed | 1032 | |
7223e9ca ILT |
1033 | // Create a PLT entry for a global symbol. |
1034 | ||
1035 | void | |
1036 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1037 | { | |
1038 | if (gsym->has_plt_offset()) | |
1039 | return; | |
1040 | if (this->plt_ == NULL) | |
1041 | this->make_plt_section(symtab, layout); | |
a3ad94ed ILT |
1042 | this->plt_->add_entry(gsym); |
1043 | } | |
1044 | ||
7223e9ca ILT |
1045 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1046 | ||
1047 | void | |
1048 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
1049 | Sized_relobj<32, false>* relobj, | |
1050 | unsigned int local_sym_index) | |
1051 | { | |
1052 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1053 | return; | |
1054 | if (this->plt_ == NULL) | |
1055 | this->make_plt_section(symtab, layout); | |
1056 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1057 | local_sym_index); | |
1058 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1059 | } | |
1060 | ||
0e70b911 CC |
1061 | // Return the number of entries in the PLT. |
1062 | ||
1063 | unsigned int | |
1064 | Target_i386::plt_entry_count() const | |
1065 | { | |
1066 | if (this->plt_ == NULL) | |
1067 | return 0; | |
1068 | return this->plt_->entry_count(); | |
1069 | } | |
1070 | ||
1071 | // Return the offset of the first non-reserved PLT entry. | |
1072 | ||
1073 | unsigned int | |
1074 | Target_i386::first_plt_entry_offset() const | |
1075 | { | |
1076 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1077 | } | |
1078 | ||
1079 | // Return the size of each PLT entry. | |
1080 | ||
1081 | unsigned int | |
1082 | Target_i386::plt_entry_size() const | |
1083 | { | |
1084 | return Output_data_plt_i386::get_plt_entry_size(); | |
1085 | } | |
1086 | ||
e291e7b9 ILT |
1087 | // Get the section to use for TLS_DESC relocations. |
1088 | ||
1089 | Target_i386::Reloc_section* | |
1090 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1091 | { | |
1092 | return this->plt_section()->rel_tls_desc(layout); | |
1093 | } | |
1094 | ||
9fa33bee | 1095 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1096 | |
1097 | void | |
1098 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1099 | { | |
1100 | if (this->tls_base_symbol_defined_) | |
1101 | return; | |
1102 | ||
1103 | Output_segment* tls_segment = layout->tls_segment(); | |
1104 | if (tls_segment != NULL) | |
1105 | { | |
183fd0e3 | 1106 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1107 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1108 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1109 | tls_segment, 0, 0, |
1110 | elfcpp::STT_TLS, | |
1111 | elfcpp::STB_LOCAL, | |
1112 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1113 | (is_exec |
1114 | ? Symbol::SEGMENT_END | |
1115 | : Symbol::SEGMENT_START), | |
1116 | true); | |
edfbb029 CC |
1117 | } |
1118 | this->tls_base_symbol_defined_ = true; | |
1119 | } | |
1120 | ||
94c4710f ILT |
1121 | // Create a GOT entry for the TLS module index. |
1122 | ||
1123 | unsigned int | |
1124 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1125 | Sized_relobj<32, false>* object) | |
1126 | { | |
1127 | if (this->got_mod_index_offset_ == -1U) | |
1128 | { | |
1129 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1130 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1131 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1132 | unsigned int got_offset = got->add_constant(0); | |
1133 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1134 | got_offset); | |
009a67a2 | 1135 | got->add_constant(0); |
94c4710f ILT |
1136 | this->got_mod_index_offset_ = got_offset; |
1137 | } | |
1138 | return this->got_mod_index_offset_; | |
1139 | } | |
1140 | ||
92e059d8 | 1141 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1142 | // symbol. IS_FINAL is true if the final address of this symbol is |
1143 | // known at link time. | |
92e059d8 | 1144 | |
af6359d5 | 1145 | tls::Tls_optimization |
7e1edb90 | 1146 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1147 | { |
1148 | // If we are generating a shared library, then we can't do anything | |
1149 | // in the linker. | |
8851ecca | 1150 | if (parameters->options().shared()) |
af6359d5 | 1151 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1152 | |
1153 | switch (r_type) | |
1154 | { | |
1155 | case elfcpp::R_386_TLS_GD: | |
1156 | case elfcpp::R_386_TLS_GOTDESC: | |
1157 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1158 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1159 | // access. Since we know that we are generating an executable, |
1160 | // we can convert this to Initial-Exec. If we also know that | |
1161 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1162 | if (is_final) |
af6359d5 ILT |
1163 | return tls::TLSOPT_TO_LE; |
1164 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1165 | |
1166 | case elfcpp::R_386_TLS_LDM: | |
1167 | // This is Local-Dynamic, which refers to a local symbol in the | |
1168 | // dynamic TLS block. Since we know that we generating an | |
1169 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1170 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1171 | |
1172 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1173 | // Another type of Local-Dynamic relocation. |
1174 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1175 | |
1176 | case elfcpp::R_386_TLS_IE: | |
1177 | case elfcpp::R_386_TLS_GOTIE: | |
1178 | case elfcpp::R_386_TLS_IE_32: | |
1179 | // These are Initial-Exec relocs which get the thread offset | |
1180 | // from the GOT. If we know that we are linking against the | |
1181 | // local symbol, we can switch to Local-Exec, which links the | |
1182 | // thread offset into the instruction. | |
a3ad94ed | 1183 | if (is_final) |
af6359d5 ILT |
1184 | return tls::TLSOPT_TO_LE; |
1185 | return tls::TLSOPT_NONE; | |
8462ae85 | 1186 | |
92e059d8 ILT |
1187 | case elfcpp::R_386_TLS_LE: |
1188 | case elfcpp::R_386_TLS_LE_32: | |
1189 | // When we already have Local-Exec, there is nothing further we | |
1190 | // can do. | |
af6359d5 | 1191 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1192 | |
1193 | default: | |
a3ad94ed | 1194 | gold_unreachable(); |
92e059d8 ILT |
1195 | } |
1196 | } | |
1197 | ||
95a2c8d6 | 1198 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1199 | |
95a2c8d6 RS |
1200 | int |
1201 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1202 | { |
1203 | switch (r_type) | |
1204 | { | |
1205 | case elfcpp::R_386_NONE: | |
1206 | case elfcpp::R_386_GNU_VTINHERIT: | |
1207 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1208 | case elfcpp::R_386_GOTPC: |
1209 | // No symbol reference. | |
1210 | return 0; | |
7223e9ca ILT |
1211 | |
1212 | case elfcpp::R_386_32: | |
1213 | case elfcpp::R_386_16: | |
1214 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1215 | return Symbol::ABSOLUTE_REF; |
1216 | ||
7223e9ca ILT |
1217 | case elfcpp::R_386_PC32: |
1218 | case elfcpp::R_386_PC16: | |
1219 | case elfcpp::R_386_PC8: | |
7223e9ca | 1220 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1221 | return Symbol::RELATIVE_REF; |
1222 | ||
1223 | case elfcpp::R_386_PLT32: | |
1224 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1225 | ||
7223e9ca | 1226 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1227 | // Absolute in GOT. |
1228 | return Symbol::ABSOLUTE_REF; | |
1229 | ||
1230 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1231 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1232 | case elfcpp::R_386_TLS_DESC_CALL: | |
1233 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1234 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1235 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1236 | case elfcpp::R_386_TLS_IE_32: | |
1237 | case elfcpp::R_386_TLS_GOTIE: | |
1238 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1239 | case elfcpp::R_386_TLS_LE_32: | |
1240 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1241 | |
1242 | case elfcpp::R_386_COPY: | |
1243 | case elfcpp::R_386_GLOB_DAT: | |
1244 | case elfcpp::R_386_JUMP_SLOT: | |
1245 | case elfcpp::R_386_RELATIVE: | |
1246 | case elfcpp::R_386_IRELATIVE: | |
1247 | case elfcpp::R_386_TLS_TPOFF: | |
1248 | case elfcpp::R_386_TLS_DTPMOD32: | |
1249 | case elfcpp::R_386_TLS_DTPOFF32: | |
1250 | case elfcpp::R_386_TLS_TPOFF32: | |
1251 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1252 | case elfcpp::R_386_32PLT: |
1253 | case elfcpp::R_386_TLS_GD_32: | |
1254 | case elfcpp::R_386_TLS_GD_PUSH: | |
1255 | case elfcpp::R_386_TLS_GD_CALL: | |
1256 | case elfcpp::R_386_TLS_GD_POP: | |
1257 | case elfcpp::R_386_TLS_LDM_32: | |
1258 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1259 | case elfcpp::R_386_TLS_LDM_CALL: | |
1260 | case elfcpp::R_386_TLS_LDM_POP: | |
1261 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1262 | default: | |
95a2c8d6 RS |
1263 | // Not expected. We will give an error later. |
1264 | return 0; | |
7223e9ca ILT |
1265 | } |
1266 | } | |
1267 | ||
95a2c8d6 RS |
1268 | // Report an unsupported relocation against a local symbol. |
1269 | ||
1270 | void | |
1271 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
1272 | unsigned int r_type) | |
1273 | { | |
1274 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1275 | object->name().c_str(), r_type); | |
1276 | } | |
1277 | ||
1278 | // Return whether we need to make a PLT entry for a relocation of a | |
1279 | // given type against a STT_GNU_IFUNC symbol. | |
1280 | ||
1281 | bool | |
1282 | Target_i386::Scan::reloc_needs_plt_for_ifunc(Sized_relobj<32, false>* object, | |
1283 | unsigned int r_type) | |
1284 | { | |
1285 | int flags = Scan::get_reference_flags(r_type); | |
1286 | if (flags & Symbol::TLS_REF) | |
1287 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1288 | object->name().c_str(), r_type); | |
1289 | return flags != 0; | |
1290 | } | |
1291 | ||
92e059d8 ILT |
1292 | // Scan a relocation for a local symbol. |
1293 | ||
1294 | inline void | |
ad0f2072 | 1295 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1296 | Layout* layout, |
1297 | Target_i386* target, | |
f6ce93d6 | 1298 | Sized_relobj<32, false>* object, |
1b64748b | 1299 | unsigned int data_shndx, |
07f397ab | 1300 | Output_section* output_section, |
1b64748b | 1301 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1302 | unsigned int r_type, |
7bf1f802 | 1303 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1304 | { |
7223e9ca ILT |
1305 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1306 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1307 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1308 | { | |
1309 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1310 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1311 | } | |
1312 | ||
92e059d8 ILT |
1313 | switch (r_type) |
1314 | { | |
1315 | case elfcpp::R_386_NONE: | |
1316 | case elfcpp::R_386_GNU_VTINHERIT: | |
1317 | case elfcpp::R_386_GNU_VTENTRY: | |
1318 | break; | |
1319 | ||
1320 | case elfcpp::R_386_32: | |
436ca963 ILT |
1321 | // If building a shared library (or a position-independent |
1322 | // executable), we need to create a dynamic relocation for | |
1323 | // this location. The relocation applied at link time will | |
1324 | // apply the link-time value, so we flag the location with | |
1325 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1326 | // relocate it easily. | |
8851ecca | 1327 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1328 | { |
1329 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1330 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1331 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1332 | output_section, data_shndx, | |
1333 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1334 | } |
1335 | break; | |
1336 | ||
1337 | case elfcpp::R_386_16: | |
1338 | case elfcpp::R_386_8: | |
1339 | // If building a shared library (or a position-independent | |
1340 | // executable), we need to create a dynamic relocation for | |
1341 | // this location. Because the addend needs to remain in the | |
1342 | // data section, we need to be careful not to apply this | |
1343 | // relocation statically. | |
8851ecca | 1344 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1345 | { |
1346 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1347 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1348 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1349 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1350 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1351 | else |
1352 | { | |
1353 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1354 | unsigned int shndx = lsym.get_st_shndx(); |
1355 | bool is_ordinary; | |
1356 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1357 | &is_ordinary); | |
1358 | if (!is_ordinary) | |
1359 | object->error(_("section symbol %u has bad shndx %u"), | |
1360 | r_sym, shndx); | |
1361 | else | |
1362 | rel_dyn->add_local_section(object, shndx, | |
1363 | r_type, output_section, | |
1364 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1365 | } |
436ca963 | 1366 | } |
92e059d8 ILT |
1367 | break; |
1368 | ||
1369 | case elfcpp::R_386_PC32: | |
1370 | case elfcpp::R_386_PC16: | |
1371 | case elfcpp::R_386_PC8: | |
1372 | break; | |
1373 | ||
df2efe71 ILT |
1374 | case elfcpp::R_386_PLT32: |
1375 | // Since we know this is a local symbol, we can handle this as a | |
1376 | // PC32 reloc. | |
1377 | break; | |
1378 | ||
ead1e424 ILT |
1379 | case elfcpp::R_386_GOTOFF: |
1380 | case elfcpp::R_386_GOTPC: | |
1381 | // We need a GOT section. | |
7e1edb90 | 1382 | target->got_section(symtab, layout); |
ead1e424 ILT |
1383 | break; |
1384 | ||
1b64748b ILT |
1385 | case elfcpp::R_386_GOT32: |
1386 | { | |
1387 | // The symbol requires a GOT entry. | |
1388 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1389 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1390 | |
1391 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1392 | // lets function pointers compare correctly with shared | |
1393 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1394 | bool is_new; | |
1395 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1396 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1397 | else | |
1398 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1399 | if (is_new) | |
1b64748b ILT |
1400 | { |
1401 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1402 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1403 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1404 | { |
1405 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1406 | unsigned int got_offset = |
1407 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1408 | rel_dyn->add_local_relative(object, r_sym, | |
1409 | elfcpp::R_386_RELATIVE, | |
1410 | got, got_offset); | |
1b64748b ILT |
1411 | } |
1412 | } | |
1413 | } | |
1414 | break; | |
1415 | ||
af6359d5 ILT |
1416 | // These are relocations which should only be seen by the |
1417 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1418 | case elfcpp::R_386_COPY: |
1419 | case elfcpp::R_386_GLOB_DAT: | |
1420 | case elfcpp::R_386_JUMP_SLOT: | |
1421 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1422 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1423 | case elfcpp::R_386_TLS_TPOFF: |
1424 | case elfcpp::R_386_TLS_DTPMOD32: | |
1425 | case elfcpp::R_386_TLS_DTPOFF32: | |
1426 | case elfcpp::R_386_TLS_TPOFF32: | |
1427 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1428 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1429 | object->name().c_str(), r_type); |
92e059d8 ILT |
1430 | break; |
1431 | ||
af6359d5 | 1432 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1433 | // linking. |
56622147 ILT |
1434 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1435 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1436 | case elfcpp::R_386_TLS_DESC_CALL: | |
1437 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1438 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1439 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1440 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1441 | case elfcpp::R_386_TLS_GOTIE: |
1442 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1443 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1444 | { |
8851ecca | 1445 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1446 | const tls::Tls_optimization optimized_type |
1447 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1448 | switch (r_type) |
1449 | { | |
56622147 | 1450 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1451 | if (optimized_type == tls::TLSOPT_NONE) |
1452 | { | |
1453 | // Create a pair of GOT entries for the module index and | |
1454 | // dtv-relative offset. | |
1455 | Output_data_got<32, false>* got | |
1456 | = target->got_section(symtab, layout); | |
1457 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1458 | unsigned int shndx = lsym.get_st_shndx(); |
1459 | bool is_ordinary; | |
1460 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1461 | if (!is_ordinary) | |
1462 | object->error(_("local symbol %u has bad shndx %u"), | |
1463 | r_sym, shndx); | |
1464 | else | |
1465 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1466 | GOT_TYPE_TLS_PAIR, | |
1467 | target->rel_dyn_section(layout), | |
1468 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1469 | } |
1470 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1471 | unsupported_reloc_local(object, r_type); | |
1472 | break; | |
1473 | ||
56622147 | 1474 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1475 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1476 | if (optimized_type == tls::TLSOPT_NONE) |
1477 | { | |
a8df5856 ILT |
1478 | // Create a double GOT entry with an R_386_TLS_DESC |
1479 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1480 | // lazily, so the GOT entry needs to be in an area in | |
1481 | // .got.plt, not .got. Call got_section to make sure | |
1482 | // the section has been created. | |
1483 | target->got_section(symtab, layout); | |
1484 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1485 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1486 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1487 | { | |
1488 | unsigned int got_offset = got->add_constant(0); | |
1489 | // The local symbol value is stored in the second | |
1490 | // GOT entry. | |
1491 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1492 | // That set the GOT offset of the local symbol to | |
1493 | // point to the second entry, but we want it to | |
1494 | // point to the first. | |
1495 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1496 | got_offset); | |
1497 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1498 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1499 | } | |
c2b45e22 CC |
1500 | } |
1501 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1502 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1503 | break; |
1504 | ||
c2b45e22 CC |
1505 | case elfcpp::R_386_TLS_DESC_CALL: |
1506 | break; | |
1507 | ||
56622147 | 1508 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1509 | if (optimized_type == tls::TLSOPT_NONE) |
1510 | { | |
1511 | // Create a GOT entry for the module index. | |
94c4710f | 1512 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1513 | } |
1514 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1515 | unsupported_reloc_local(object, r_type); |
1516 | break; | |
1517 | ||
56622147 | 1518 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1519 | break; |
1520 | ||
56622147 ILT |
1521 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1522 | case elfcpp::R_386_TLS_IE_32: | |
1523 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1524 | layout->set_has_static_tls(); |
07f397ab ILT |
1525 | if (optimized_type == tls::TLSOPT_NONE) |
1526 | { | |
7bf1f802 ILT |
1527 | // For the R_386_TLS_IE relocation, we need to create a |
1528 | // dynamic relocation when building a shared library. | |
1529 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1530 | && parameters->options().shared()) |
7bf1f802 ILT |
1531 | { |
1532 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1533 | unsigned int r_sym |
1534 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1535 | rel_dyn->add_local_relative(object, r_sym, | |
1536 | elfcpp::R_386_RELATIVE, | |
1537 | output_section, data_shndx, | |
1538 | reloc.get_r_offset()); | |
7bf1f802 | 1539 | } |
07f397ab ILT |
1540 | // Create a GOT entry for the tp-relative offset. |
1541 | Output_data_got<32, false>* got | |
1542 | = target->got_section(symtab, layout); | |
1543 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1544 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1545 | ? elfcpp::R_386_TLS_TPOFF32 | |
1546 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1547 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1548 | ? GOT_TYPE_TLS_OFFSET | |
1549 | : GOT_TYPE_TLS_NOFFSET); | |
1550 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1551 | target->rel_dyn_section(layout), |
1552 | dyn_r_type); | |
07f397ab ILT |
1553 | } |
1554 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1555 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1556 | break; |
af6359d5 | 1557 | |
56622147 ILT |
1558 | case elfcpp::R_386_TLS_LE: // Local-exec |
1559 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1560 | layout->set_has_static_tls(); |
07f397ab | 1561 | if (output_is_shared) |
7bf1f802 ILT |
1562 | { |
1563 | // We need to create a dynamic relocation. | |
dceae3c1 | 1564 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1565 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1566 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1567 | ? elfcpp::R_386_TLS_TPOFF32 | |
1568 | : elfcpp::R_386_TLS_TPOFF); | |
1569 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1570 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1571 | data_shndx, reloc.get_r_offset()); | |
1572 | } | |
56622147 ILT |
1573 | break; |
1574 | ||
af6359d5 ILT |
1575 | default: |
1576 | gold_unreachable(); | |
7e1edb90 ILT |
1577 | } |
1578 | } | |
92e059d8 ILT |
1579 | break; |
1580 | ||
92e059d8 ILT |
1581 | case elfcpp::R_386_32PLT: |
1582 | case elfcpp::R_386_TLS_GD_32: | |
1583 | case elfcpp::R_386_TLS_GD_PUSH: | |
1584 | case elfcpp::R_386_TLS_GD_CALL: | |
1585 | case elfcpp::R_386_TLS_GD_POP: | |
1586 | case elfcpp::R_386_TLS_LDM_32: | |
1587 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1588 | case elfcpp::R_386_TLS_LDM_CALL: | |
1589 | case elfcpp::R_386_TLS_LDM_POP: | |
1590 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1591 | default: | |
af6359d5 | 1592 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1593 | break; |
1594 | } | |
1595 | } | |
1596 | ||
af6359d5 ILT |
1597 | // Report an unsupported relocation against a global symbol. |
1598 | ||
1599 | void | |
1600 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1601 | unsigned int r_type, | |
1602 | Symbol* gsym) | |
1603 | { | |
75f2446e | 1604 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1605 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1606 | } |
1607 | ||
0897ed3b ST |
1608 | inline bool |
1609 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1610 | { | |
1611 | switch (r_type) | |
1612 | { | |
1613 | case elfcpp::R_386_32: | |
1614 | case elfcpp::R_386_16: | |
1615 | case elfcpp::R_386_8: | |
1616 | case elfcpp::R_386_GOTOFF: | |
1617 | case elfcpp::R_386_GOT32: | |
1618 | { | |
1619 | return true; | |
1620 | } | |
1621 | default: | |
1622 | return false; | |
1623 | } | |
1624 | return false; | |
1625 | } | |
1626 | ||
1627 | inline bool | |
1628 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1629 | Symbol_table* , | |
1630 | Layout* , | |
1631 | Target_i386* , | |
1632 | Sized_relobj<32, false>* , | |
1633 | unsigned int , | |
1634 | Output_section* , | |
1635 | const elfcpp::Rel<32, false>& , | |
1636 | unsigned int r_type, | |
1637 | const elfcpp::Sym<32, false>&) | |
1638 | { | |
1639 | return possible_function_pointer_reloc(r_type); | |
1640 | } | |
1641 | ||
1642 | inline bool | |
1643 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1644 | Symbol_table* , | |
1645 | Layout* , | |
1646 | Target_i386* , | |
1647 | Sized_relobj<32, false>* , | |
1648 | unsigned int , | |
1649 | Output_section* , | |
1650 | const elfcpp::Rel<32, false>& , | |
1651 | unsigned int r_type, | |
1652 | Symbol*) | |
1653 | { | |
1654 | return possible_function_pointer_reloc(r_type); | |
1655 | } | |
1656 | ||
92e059d8 ILT |
1657 | // Scan a relocation for a global symbol. |
1658 | ||
1659 | inline void | |
ad0f2072 | 1660 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1661 | Layout* layout, |
1662 | Target_i386* target, | |
f6ce93d6 | 1663 | Sized_relobj<32, false>* object, |
a3ad94ed | 1664 | unsigned int data_shndx, |
07f397ab | 1665 | Output_section* output_section, |
a3ad94ed ILT |
1666 | const elfcpp::Rel<32, false>& reloc, |
1667 | unsigned int r_type, | |
92e059d8 ILT |
1668 | Symbol* gsym) |
1669 | { | |
7223e9ca ILT |
1670 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1671 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1672 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1673 | target->make_plt_entry(symtab, layout, gsym); | |
1674 | ||
92e059d8 ILT |
1675 | switch (r_type) |
1676 | { | |
1677 | case elfcpp::R_386_NONE: | |
1678 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1679 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1680 | break; |
1681 | ||
1682 | case elfcpp::R_386_32: | |
92e059d8 | 1683 | case elfcpp::R_386_16: |
92e059d8 | 1684 | case elfcpp::R_386_8: |
96f2030e | 1685 | { |
d61c6bd4 ILT |
1686 | // Make a PLT entry if necessary. |
1687 | if (gsym->needs_plt_entry()) | |
1688 | { | |
1689 | target->make_plt_entry(symtab, layout, gsym); | |
1690 | // Since this is not a PC-relative relocation, we may be | |
1691 | // taking the address of a function. In that case we need to | |
1692 | // set the entry in the dynamic symbol table to the address of | |
1693 | // the PLT entry. | |
8851ecca | 1694 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1695 | gsym->set_needs_dynsym_value(); |
1696 | } | |
1697 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1698 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1699 | { |
966d4097 | 1700 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1701 | { |
12c0daef | 1702 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1703 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1704 | } |
7223e9ca ILT |
1705 | else if (r_type == elfcpp::R_386_32 |
1706 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1707 | && gsym->can_use_relative_reloc(false) | |
1708 | && !gsym->is_from_dynobj() | |
1709 | && !gsym->is_undefined() | |
1710 | && !gsym->is_preemptible()) | |
1711 | { | |
1712 | // Use an IRELATIVE reloc for a locally defined | |
1713 | // STT_GNU_IFUNC symbol. This makes a function | |
1714 | // address in a PIE executable match the address in a | |
1715 | // shared library that it links against. | |
1716 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1717 | rel_dyn->add_symbolless_global_addend(gsym, | |
1718 | elfcpp::R_386_IRELATIVE, | |
1719 | output_section, | |
1720 | object, data_shndx, | |
1721 | reloc.get_r_offset()); | |
1722 | } | |
d61c6bd4 ILT |
1723 | else if (r_type == elfcpp::R_386_32 |
1724 | && gsym->can_use_relative_reloc(false)) | |
1725 | { | |
1726 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1727 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1728 | output_section, object, | |
1729 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1730 | } |
1731 | else | |
1732 | { | |
96f2030e | 1733 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1734 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1735 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1736 | } |
1737 | } | |
1738 | } | |
1739 | break; | |
1740 | ||
1741 | case elfcpp::R_386_PC32: | |
1742 | case elfcpp::R_386_PC16: | |
1743 | case elfcpp::R_386_PC8: | |
1744 | { | |
1745 | // Make a PLT entry if necessary. | |
1746 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1747 | { |
1748 | // These relocations are used for function calls only in | |
1749 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1750 | // we'll need a text relocation anyway, so we can skip the | |
1751 | // PLT entry and let the dynamic linker bind the call directly | |
1752 | // to the target. For smaller relocations, we should use a | |
1753 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1754 | if (!parameters->options().shared() |
7bf1f802 ILT |
1755 | || r_type != elfcpp::R_386_PC32) |
1756 | target->make_plt_entry(symtab, layout, gsym); | |
1757 | } | |
d61c6bd4 | 1758 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1759 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1760 | { |
966d4097 | 1761 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1762 | { |
12c0daef | 1763 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1764 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1765 | } |
86849f1f | 1766 | else |
d61c6bd4 ILT |
1767 | { |
1768 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1769 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1770 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1771 | } |
96f2030e ILT |
1772 | } |
1773 | } | |
92e059d8 ILT |
1774 | break; |
1775 | ||
ead1e424 | 1776 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1777 | { |
1778 | // The symbol requires a GOT entry. | |
7e1edb90 | 1779 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1780 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1781 | { |
1782 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1783 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1784 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1785 | else | |
1786 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1787 | } | |
7bf1f802 ILT |
1788 | else |
1789 | { | |
8462ae85 | 1790 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1791 | // GOT entry with a dynamic relocation. |
1792 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1793 | if (gsym->is_from_dynobj() |
1794 | || gsym->is_undefined() | |
7223e9ca ILT |
1795 | || gsym->is_preemptible() |
1796 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1797 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
1798 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1799 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1800 | else |
8462ae85 | 1801 | { |
7223e9ca ILT |
1802 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1803 | // offset into the GOT, so that function pointer | |
1804 | // comparisons work correctly. | |
1805 | bool is_new; | |
1806 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1807 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1808 | else | |
1809 | { | |
1810 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1811 | // Tell the dynamic linker to use the PLT address | |
1812 | // when resolving relocations. | |
1813 | if (gsym->is_from_dynobj() | |
1814 | && !parameters->options().shared()) | |
1815 | gsym->set_needs_dynsym_value(); | |
1816 | } | |
1817 | if (is_new) | |
1818 | { | |
1819 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1820 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
1821 | got, got_off); | |
1822 | } | |
8462ae85 ILT |
1823 | } |
1824 | } | |
1825 | } | |
ead1e424 ILT |
1826 | break; |
1827 | ||
1828 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1829 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1830 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1831 | if (gsym->final_value_is_known()) |
ead1e424 | 1832 | break; |
436ca963 ILT |
1833 | // If building a shared library, we can also skip the PLT entry |
1834 | // if the symbol is defined in the output file and is protected | |
1835 | // or hidden. | |
1836 | if (gsym->is_defined() | |
1837 | && !gsym->is_from_dynobj() | |
1838 | && !gsym->is_preemptible()) | |
1839 | break; | |
7e1edb90 | 1840 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1841 | break; |
1842 | ||
1843 | case elfcpp::R_386_GOTOFF: | |
1844 | case elfcpp::R_386_GOTPC: | |
1845 | // We need a GOT section. | |
7e1edb90 | 1846 | target->got_section(symtab, layout); |
ead1e424 ILT |
1847 | break; |
1848 | ||
af6359d5 ILT |
1849 | // These are relocations which should only be seen by the |
1850 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1851 | case elfcpp::R_386_COPY: |
1852 | case elfcpp::R_386_GLOB_DAT: | |
1853 | case elfcpp::R_386_JUMP_SLOT: | |
1854 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1855 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1856 | case elfcpp::R_386_TLS_TPOFF: |
1857 | case elfcpp::R_386_TLS_DTPMOD32: | |
1858 | case elfcpp::R_386_TLS_DTPOFF32: | |
1859 | case elfcpp::R_386_TLS_TPOFF32: | |
1860 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1861 | gold_error(_("%s: unexpected reloc %u in object file"), |
1862 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1863 | break; |
1864 | ||
d61c17ea ILT |
1865 | // These are initial tls relocs, which are expected when |
1866 | // linking. | |
56622147 ILT |
1867 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1868 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1869 | case elfcpp::R_386_TLS_DESC_CALL: | |
1870 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1871 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1872 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1873 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1874 | case elfcpp::R_386_TLS_GOTIE: |
1875 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1876 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1877 | { |
7e1edb90 | 1878 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1879 | const tls::Tls_optimization optimized_type |
1880 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1881 | switch (r_type) |
1882 | { | |
56622147 | 1883 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1884 | if (optimized_type == tls::TLSOPT_NONE) |
1885 | { | |
1886 | // Create a pair of GOT entries for the module index and | |
1887 | // dtv-relative offset. | |
1888 | Output_data_got<32, false>* got | |
1889 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1890 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1891 | target->rel_dyn_section(layout), |
1892 | elfcpp::R_386_TLS_DTPMOD32, | |
1893 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1894 | } |
1895 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1896 | { | |
1897 | // Create a GOT entry for the tp-relative offset. | |
1898 | Output_data_got<32, false>* got | |
1899 | = target->got_section(symtab, layout); | |
c2b45e22 | 1900 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1901 | target->rel_dyn_section(layout), |
c2b45e22 | 1902 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1903 | } |
1904 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1905 | unsupported_reloc_global(object, r_type, gsym); | |
1906 | break; | |
1907 | ||
56622147 | 1908 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1909 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1910 | if (optimized_type == tls::TLSOPT_NONE) |
1911 | { | |
a8df5856 ILT |
1912 | // Create a double GOT entry with an R_386_TLS_DESC |
1913 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1914 | // lazily, so the GOT entry needs to be in an area in | |
1915 | // .got.plt, not .got. Call got_section to make sure | |
1916 | // the section has been created. | |
1917 | target->got_section(symtab, layout); | |
1918 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1919 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1920 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1921 | elfcpp::R_386_TLS_DESC, 0); |
1922 | } | |
1923 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1924 | { | |
1925 | // Create a GOT entry for the tp-relative offset. | |
1926 | Output_data_got<32, false>* got | |
1927 | = target->got_section(symtab, layout); | |
1928 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1929 | target->rel_dyn_section(layout), | |
1930 | elfcpp::R_386_TLS_TPOFF); | |
1931 | } | |
1932 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1933 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1934 | break; |
1935 | ||
1936 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1937 | break; |
1938 | ||
56622147 | 1939 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1940 | if (optimized_type == tls::TLSOPT_NONE) |
1941 | { | |
1942 | // Create a GOT entry for the module index. | |
94c4710f | 1943 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1944 | } |
1945 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1946 | unsupported_reloc_global(object, r_type, gsym); |
1947 | break; | |
1948 | ||
56622147 | 1949 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1950 | break; |
1951 | ||
56622147 ILT |
1952 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1953 | case elfcpp::R_386_TLS_IE_32: | |
1954 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1955 | layout->set_has_static_tls(); |
07f397ab ILT |
1956 | if (optimized_type == tls::TLSOPT_NONE) |
1957 | { | |
7bf1f802 ILT |
1958 | // For the R_386_TLS_IE relocation, we need to create a |
1959 | // dynamic relocation when building a shared library. | |
1960 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1961 | && parameters->options().shared()) |
07f397ab | 1962 | { |
07f397ab | 1963 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1964 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1965 | output_section, object, | |
1966 | data_shndx, | |
1967 | reloc.get_r_offset()); | |
07f397ab | 1968 | } |
7bf1f802 ILT |
1969 | // Create a GOT entry for the tp-relative offset. |
1970 | Output_data_got<32, false>* got | |
1971 | = target->got_section(symtab, layout); | |
1972 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1973 | ? elfcpp::R_386_TLS_TPOFF32 | |
1974 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1975 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1976 | ? GOT_TYPE_TLS_OFFSET | |
1977 | : GOT_TYPE_TLS_NOFFSET); | |
1978 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1979 | target->rel_dyn_section(layout), |
1980 | dyn_r_type); | |
07f397ab ILT |
1981 | } |
1982 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1983 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1984 | break; |
af6359d5 | 1985 | |
56622147 ILT |
1986 | case elfcpp::R_386_TLS_LE: // Local-exec |
1987 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1988 | layout->set_has_static_tls(); |
8851ecca | 1989 | if (parameters->options().shared()) |
7bf1f802 ILT |
1990 | { |
1991 | // We need to create a dynamic relocation. | |
1992 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1993 | ? elfcpp::R_386_TLS_TPOFF32 | |
1994 | : elfcpp::R_386_TLS_TPOFF); | |
1995 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1996 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1997 | data_shndx, reloc.get_r_offset()); | |
1998 | } | |
56622147 ILT |
1999 | break; |
2000 | ||
af6359d5 ILT |
2001 | default: |
2002 | gold_unreachable(); | |
a3ad94ed ILT |
2003 | } |
2004 | } | |
92e059d8 ILT |
2005 | break; |
2006 | ||
92e059d8 ILT |
2007 | case elfcpp::R_386_32PLT: |
2008 | case elfcpp::R_386_TLS_GD_32: | |
2009 | case elfcpp::R_386_TLS_GD_PUSH: | |
2010 | case elfcpp::R_386_TLS_GD_CALL: | |
2011 | case elfcpp::R_386_TLS_GD_POP: | |
2012 | case elfcpp::R_386_TLS_LDM_32: | |
2013 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2014 | case elfcpp::R_386_TLS_LDM_CALL: | |
2015 | case elfcpp::R_386_TLS_LDM_POP: | |
2016 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2017 | default: | |
af6359d5 | 2018 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2019 | break; |
2020 | } | |
2021 | } | |
2022 | ||
6d03d481 ST |
2023 | // Process relocations for gc. |
2024 | ||
2025 | void | |
ad0f2072 | 2026 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
2027 | Layout* layout, |
2028 | Sized_relobj<32, false>* object, | |
2029 | unsigned int data_shndx, | |
2030 | unsigned int, | |
2031 | const unsigned char* prelocs, | |
2032 | size_t reloc_count, | |
2033 | Output_section* output_section, | |
2034 | bool needs_special_offset_handling, | |
2035 | size_t local_symbol_count, | |
2036 | const unsigned char* plocal_symbols) | |
2037 | { | |
2038 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2039 | Target_i386::Scan, |
2040 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2041 | symtab, |
2042 | layout, | |
2043 | this, | |
2044 | object, | |
2045 | data_shndx, | |
2046 | prelocs, | |
2047 | reloc_count, | |
2048 | output_section, | |
2049 | needs_special_offset_handling, | |
2050 | local_symbol_count, | |
2051 | plocal_symbols); | |
2052 | } | |
2053 | ||
92e059d8 ILT |
2054 | // Scan relocations for a section. |
2055 | ||
2056 | void | |
ad0f2072 | 2057 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2058 | Layout* layout, |
f6ce93d6 | 2059 | Sized_relobj<32, false>* object, |
a3ad94ed | 2060 | unsigned int data_shndx, |
92e059d8 ILT |
2061 | unsigned int sh_type, |
2062 | const unsigned char* prelocs, | |
2063 | size_t reloc_count, | |
730cdc88 ILT |
2064 | Output_section* output_section, |
2065 | bool needs_special_offset_handling, | |
92e059d8 | 2066 | size_t local_symbol_count, |
730cdc88 | 2067 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2068 | { |
2069 | if (sh_type == elfcpp::SHT_RELA) | |
2070 | { | |
75f2446e ILT |
2071 | gold_error(_("%s: unsupported RELA reloc section"), |
2072 | object->name().c_str()); | |
2073 | return; | |
92e059d8 ILT |
2074 | } |
2075 | ||
ead1e424 ILT |
2076 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2077 | Target_i386::Scan>( | |
92e059d8 | 2078 | symtab, |
ead1e424 ILT |
2079 | layout, |
2080 | this, | |
92e059d8 | 2081 | object, |
a3ad94ed | 2082 | data_shndx, |
92e059d8 ILT |
2083 | prelocs, |
2084 | reloc_count, | |
730cdc88 ILT |
2085 | output_section, |
2086 | needs_special_offset_handling, | |
92e059d8 | 2087 | local_symbol_count, |
730cdc88 | 2088 | plocal_symbols); |
92e059d8 ILT |
2089 | } |
2090 | ||
16649710 | 2091 | // Finalize the sections. |
5a6f7e2d ILT |
2092 | |
2093 | void | |
f59f41f3 DK |
2094 | Target_i386::do_finalize_sections( |
2095 | Layout* layout, | |
2096 | const Input_objects*, | |
e785ec03 | 2097 | Symbol_table* symtab) |
5a6f7e2d | 2098 | { |
ea715a34 ILT |
2099 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2100 | ? NULL | |
2101 | : this->plt_->rel_plt()); | |
2102 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2103 | this->rel_dyn_, true, false); |
16649710 ILT |
2104 | |
2105 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2106 | // relocs. | |
12c0daef ILT |
2107 | if (this->copy_relocs_.any_saved_relocs()) |
2108 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2109 | |
2110 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2111 | // the .got.plt section. | |
2112 | Symbol* sym = this->global_offset_table_; | |
2113 | if (sym != NULL) | |
2114 | { | |
2115 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2116 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2117 | } | |
5a6f7e2d ILT |
2118 | } |
2119 | ||
86849f1f ILT |
2120 | // Return whether a direct absolute static relocation needs to be applied. |
2121 | // In cases where Scan::local() or Scan::global() has created | |
2122 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2123 | // of the relocation is carried in the data, and we must not | |
2124 | // apply the static relocation. | |
2125 | ||
2126 | inline bool | |
2127 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2128 | unsigned int r_type, |
031cdbed ILT |
2129 | bool is_32bit, |
2130 | Output_section* output_section) | |
86849f1f | 2131 | { |
031cdbed ILT |
2132 | // If the output section is not allocated, then we didn't call |
2133 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2134 | // the reloc here. | |
2135 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2136 | return true; | |
2137 | ||
95a2c8d6 RS |
2138 | int ref_flags = Scan::get_reference_flags(r_type); |
2139 | ||
d61c6bd4 ILT |
2140 | // For local symbols, we will have created a non-RELATIVE dynamic |
2141 | // relocation only if (a) the output is position independent, | |
2142 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2143 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2144 | if (gsym == NULL) |
8851ecca | 2145 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2146 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2147 | && !is_32bit); |
86849f1f | 2148 | |
0700cf32 ILT |
2149 | // For global symbols, we use the same helper routines used in the |
2150 | // scan pass. If we did not create a dynamic relocation, or if we | |
2151 | // created a RELATIVE dynamic relocation, we should apply the static | |
2152 | // relocation. | |
2153 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2154 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2155 | && gsym->can_use_relative_reloc(ref_flags | |
2156 | & Symbol::FUNCTION_CALL); | |
2157 | return !has_dyn || is_rel; | |
86849f1f ILT |
2158 | } |
2159 | ||
61ba1cf9 ILT |
2160 | // Perform a relocation. |
2161 | ||
ead1e424 | 2162 | inline bool |
92e059d8 | 2163 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2164 | Target_i386* target, |
ca09d69a | 2165 | Output_section* output_section, |
92e059d8 ILT |
2166 | size_t relnum, |
2167 | const elfcpp::Rel<32, false>& rel, | |
2168 | unsigned int r_type, | |
c06b7b0b | 2169 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2170 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2171 | unsigned char* view, |
2172 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2173 | section_size_type view_size) |
61ba1cf9 | 2174 | { |
ead1e424 ILT |
2175 | if (this->skip_call_tls_get_addr_) |
2176 | { | |
5efc7cd2 CC |
2177 | if ((r_type != elfcpp::R_386_PLT32 |
2178 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2179 | || gsym == NULL |
2180 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2181 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2182 | _("missing expected TLS relocation")); | |
2183 | else | |
ead1e424 | 2184 | { |
75f2446e ILT |
2185 | this->skip_call_tls_get_addr_ = false; |
2186 | return false; | |
ead1e424 | 2187 | } |
ead1e424 ILT |
2188 | } |
2189 | ||
7223e9ca ILT |
2190 | const Sized_relobj<32, false>* object = relinfo->object; |
2191 | ||
a3ad94ed | 2192 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2193 | Symbol_value<32> symval; |
436ca963 | 2194 | if (gsym != NULL |
7223e9ca ILT |
2195 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2196 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2197 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2198 | && gsym->can_use_relative_reloc(false) |
2199 | && !gsym->is_from_dynobj() | |
2200 | && !gsym->is_undefined() | |
2201 | && !gsym->is_preemptible()) | |
2202 | { | |
2203 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2204 | // want to use the real value of the symbol, not the PLT offset. | |
2205 | } | |
2206 | else if (gsym != NULL | |
95a2c8d6 | 2207 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2208 | { |
b8e6aad9 ILT |
2209 | symval.set_output_value(target->plt_section()->address() |
2210 | + gsym->plt_offset()); | |
2211 | psymval = &symval; | |
a3ad94ed | 2212 | } |
7223e9ca ILT |
2213 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2214 | { | |
2215 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2216 | if (object->local_has_plt_offset(r_sym)) | |
2217 | { | |
2218 | symval.set_output_value(target->plt_section()->address() | |
2219 | + object->local_plt_offset(r_sym)); | |
2220 | psymval = &symval; | |
2221 | } | |
2222 | } | |
b8e6aad9 | 2223 | |
1b64748b | 2224 | // Get the GOT offset if needed. |
96f2030e ILT |
2225 | // The GOT pointer points to the end of the GOT section. |
2226 | // We need to subtract the size of the GOT section to get | |
2227 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2228 | bool have_got_offset = false; |
2229 | unsigned int got_offset = 0; | |
2230 | switch (r_type) | |
2231 | { | |
2232 | case elfcpp::R_386_GOT32: | |
2233 | if (gsym != NULL) | |
2234 | { | |
0a65a3a7 CC |
2235 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2236 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2237 | - target->got_size()); | |
1b64748b ILT |
2238 | } |
2239 | else | |
2240 | { | |
2241 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2242 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2243 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2244 | - target->got_size()); | |
1b64748b ILT |
2245 | } |
2246 | have_got_offset = true; | |
2247 | break; | |
2248 | ||
2249 | default: | |
2250 | break; | |
2251 | } | |
2252 | ||
61ba1cf9 ILT |
2253 | switch (r_type) |
2254 | { | |
2255 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2256 | case elfcpp::R_386_GNU_VTINHERIT: |
2257 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2258 | break; |
2259 | ||
2260 | case elfcpp::R_386_32: | |
95a2c8d6 | 2261 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2262 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2263 | break; |
2264 | ||
2265 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2266 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2267 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2268 | break; |
2269 | ||
2270 | case elfcpp::R_386_16: | |
95a2c8d6 | 2271 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2272 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2273 | break; |
2274 | ||
2275 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2276 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2277 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2278 | break; |
2279 | ||
92e059d8 | 2280 | case elfcpp::R_386_8: |
95a2c8d6 | 2281 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2282 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2283 | break; |
2284 | ||
2285 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2286 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2287 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2288 | break; |
2289 | ||
ead1e424 | 2290 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2291 | gold_assert(gsym == NULL |
2292 | || gsym->has_plt_offset() | |
99f8faca ILT |
2293 | || gsym->final_value_is_known() |
2294 | || (gsym->is_defined() | |
2295 | && !gsym->is_from_dynobj() | |
2296 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2297 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2298 | break; |
2299 | ||
2300 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2301 | gold_assert(have_got_offset); |
2302 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2303 | break; |
2304 | ||
2305 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2306 | { |
2307 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2308 | value = (psymval->value(object, 0) | |
96f2030e | 2309 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2310 | Relocate_functions<32, false>::rel32(view, value); |
2311 | } | |
ead1e424 ILT |
2312 | break; |
2313 | ||
2314 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2315 | { |
2316 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2317 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2318 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2319 | } | |
ead1e424 ILT |
2320 | break; |
2321 | ||
92e059d8 ILT |
2322 | case elfcpp::R_386_COPY: |
2323 | case elfcpp::R_386_GLOB_DAT: | |
2324 | case elfcpp::R_386_JUMP_SLOT: | |
2325 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2326 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2327 | // These are outstanding tls relocs, which are unexpected when |
2328 | // linking. | |
92e059d8 ILT |
2329 | case elfcpp::R_386_TLS_TPOFF: |
2330 | case elfcpp::R_386_TLS_DTPMOD32: | |
2331 | case elfcpp::R_386_TLS_DTPOFF32: | |
2332 | case elfcpp::R_386_TLS_TPOFF32: | |
2333 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2334 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2335 | _("unexpected reloc %u in object file"), | |
2336 | r_type); | |
92e059d8 ILT |
2337 | break; |
2338 | ||
d61c17ea ILT |
2339 | // These are initial tls relocs, which are expected when |
2340 | // linking. | |
56622147 ILT |
2341 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2342 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2343 | case elfcpp::R_386_TLS_DESC_CALL: | |
2344 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2345 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2346 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2347 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2348 | case elfcpp::R_386_TLS_GOTIE: |
2349 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2350 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2351 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2352 | view, address, view_size); | |
92e059d8 ILT |
2353 | break; |
2354 | ||
92e059d8 ILT |
2355 | case elfcpp::R_386_32PLT: |
2356 | case elfcpp::R_386_TLS_GD_32: | |
2357 | case elfcpp::R_386_TLS_GD_PUSH: | |
2358 | case elfcpp::R_386_TLS_GD_CALL: | |
2359 | case elfcpp::R_386_TLS_GD_POP: | |
2360 | case elfcpp::R_386_TLS_LDM_32: | |
2361 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2362 | case elfcpp::R_386_TLS_LDM_CALL: | |
2363 | case elfcpp::R_386_TLS_LDM_POP: | |
2364 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2365 | default: |
75f2446e ILT |
2366 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2367 | _("unsupported reloc %u"), | |
2368 | r_type); | |
92e059d8 ILT |
2369 | break; |
2370 | } | |
ead1e424 ILT |
2371 | |
2372 | return true; | |
92e059d8 ILT |
2373 | } |
2374 | ||
2375 | // Perform a TLS relocation. | |
2376 | ||
2377 | inline void | |
2378 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2379 | Target_i386* target, |
92e059d8 ILT |
2380 | size_t relnum, |
2381 | const elfcpp::Rel<32, false>& rel, | |
2382 | unsigned int r_type, | |
c06b7b0b | 2383 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2384 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2385 | unsigned char* view, |
2386 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2387 | section_size_type view_size) |
92e059d8 ILT |
2388 | { |
2389 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2390 | |
07f397ab ILT |
2391 | const Sized_relobj<32, false>* object = relinfo->object; |
2392 | ||
2393 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2394 | |
b3705d2a ILT |
2395 | const bool is_final = (gsym == NULL |
2396 | ? !parameters->options().shared() | |
2397 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2398 | const tls::Tls_optimization optimized_type |
2399 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2400 | switch (r_type) |
2401 | { | |
56622147 | 2402 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2403 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2404 | { |
07f397ab | 2405 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2406 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2407 | rel, r_type, value, view, | |
2408 | view_size); | |
92e059d8 ILT |
2409 | break; |
2410 | } | |
07f397ab ILT |
2411 | else |
2412 | { | |
c2b45e22 CC |
2413 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2414 | ? GOT_TYPE_TLS_NOFFSET | |
2415 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2416 | unsigned int got_offset; |
2417 | if (gsym != NULL) | |
2418 | { | |
c2b45e22 CC |
2419 | gold_assert(gsym->has_got_offset(got_type)); |
2420 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2421 | } |
2422 | else | |
2423 | { | |
2424 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2425 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2426 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2427 | - target->got_size()); |
2428 | } | |
2429 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2430 | { | |
2431 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2432 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2433 | got_offset, view, view_size); | |
07f397ab ILT |
2434 | break; |
2435 | } | |
2436 | else if (optimized_type == tls::TLSOPT_NONE) | |
2437 | { | |
2438 | // Relocate the field with the offset of the pair of GOT | |
2439 | // entries. | |
2440 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2441 | break; | |
2442 | } | |
2443 | } | |
75f2446e ILT |
2444 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2445 | _("unsupported reloc %u"), | |
2446 | r_type); | |
92e059d8 ILT |
2447 | break; |
2448 | ||
56622147 ILT |
2449 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2450 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2451 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2452 | if (optimized_type == tls::TLSOPT_TO_LE) |
2453 | { | |
2454 | gold_assert(tls_segment != NULL); | |
2455 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2456 | rel, r_type, value, view, | |
2457 | view_size); | |
2458 | break; | |
2459 | } | |
2460 | else | |
2461 | { | |
2462 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2463 | ? GOT_TYPE_TLS_NOFFSET | |
2464 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2465 | unsigned int got_offset = 0; |
2466 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2467 | && optimized_type == tls::TLSOPT_NONE) | |
2468 | { | |
2469 | // We created GOT entries in the .got.tlsdesc portion of | |
2470 | // the .got.plt section, but the offset stored in the | |
2471 | // symbol is the offset within .got.tlsdesc. | |
2472 | got_offset = (target->got_size() | |
2473 | + target->got_plt_section()->data_size()); | |
2474 | } | |
c2b45e22 CC |
2475 | if (gsym != NULL) |
2476 | { | |
2477 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2478 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2479 | } |
2480 | else | |
2481 | { | |
2482 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2483 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2484 | got_offset += (object->local_got_offset(r_sym, got_type) |
2485 | - target->got_size()); | |
c2b45e22 CC |
2486 | } |
2487 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2488 | { | |
2489 | gold_assert(tls_segment != NULL); | |
2490 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2491 | got_offset, view, view_size); | |
2492 | break; | |
2493 | } | |
2494 | else if (optimized_type == tls::TLSOPT_NONE) | |
2495 | { | |
2496 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2497 | { | |
2498 | // Relocate the field with the offset of the pair of GOT | |
2499 | // entries. | |
2500 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2501 | } | |
2502 | break; | |
2503 | } | |
2504 | } | |
75f2446e ILT |
2505 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2506 | _("unsupported reloc %u"), | |
2507 | r_type); | |
ead1e424 ILT |
2508 | break; |
2509 | ||
56622147 | 2510 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2511 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2512 | { | |
75f2446e ILT |
2513 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2514 | _("both SUN and GNU model " | |
2515 | "TLS relocations")); | |
2516 | break; | |
46cf9fa2 ILT |
2517 | } |
2518 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2519 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2520 | { |
07f397ab | 2521 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2522 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2523 | value, view, view_size); | |
2524 | break; | |
2525 | } | |
07f397ab ILT |
2526 | else if (optimized_type == tls::TLSOPT_NONE) |
2527 | { | |
2528 | // Relocate the field with the offset of the GOT entry for | |
2529 | // the module index. | |
2530 | unsigned int got_offset; | |
94c4710f ILT |
2531 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2532 | - target->got_size()); | |
07f397ab ILT |
2533 | Relocate_functions<32, false>::rel32(view, got_offset); |
2534 | break; | |
2535 | } | |
75f2446e ILT |
2536 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2537 | _("unsupported reloc %u"), | |
2538 | r_type); | |
46cf9fa2 ILT |
2539 | break; |
2540 | ||
56622147 | 2541 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2542 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2543 | { |
82bb573a ILT |
2544 | // This reloc can appear in debugging sections, in which |
2545 | // case we must not convert to local-exec. We decide what | |
2546 | // to do based on whether the section is marked as | |
2547 | // containing executable code. That is what the GNU linker | |
2548 | // does as well. | |
2549 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2550 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2551 | { |
2552 | gold_assert(tls_segment != NULL); | |
2553 | value -= tls_segment->memsz(); | |
2554 | } | |
e8a9fcda | 2555 | } |
46cf9fa2 ILT |
2556 | Relocate_functions<32, false>::rel32(view, value); |
2557 | break; | |
2558 | ||
56622147 ILT |
2559 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2560 | case elfcpp::R_386_TLS_GOTIE: | |
2561 | case elfcpp::R_386_TLS_IE_32: | |
2562 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2563 | { | |
07f397ab | 2564 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2565 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2566 | rel, r_type, value, view, | |
2567 | view_size); | |
2568 | break; | |
2569 | } | |
07f397ab ILT |
2570 | else if (optimized_type == tls::TLSOPT_NONE) |
2571 | { | |
2572 | // Relocate the field with the offset of the GOT entry for | |
2573 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2574 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2575 | ? GOT_TYPE_TLS_OFFSET | |
2576 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2577 | unsigned int got_offset; |
2578 | if (gsym != NULL) | |
2579 | { | |
c2b45e22 CC |
2580 | gold_assert(gsym->has_got_offset(got_type)); |
2581 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2582 | } |
2583 | else | |
2584 | { | |
2585 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2586 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2587 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2588 | } |
2589 | // For the R_386_TLS_IE relocation, we need to apply the | |
2590 | // absolute address of the GOT entry. | |
2591 | if (r_type == elfcpp::R_386_TLS_IE) | |
2592 | got_offset += target->got_plt_section()->address(); | |
2593 | // All GOT offsets are relative to the end of the GOT. | |
2594 | got_offset -= target->got_size(); | |
2595 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2596 | break; | |
2597 | } | |
75f2446e ILT |
2598 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2599 | _("unsupported reloc %u"), | |
2600 | r_type); | |
92e059d8 | 2601 | break; |
92e059d8 | 2602 | |
56622147 | 2603 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2604 | // If we're creating a shared library, a dynamic relocation will |
2605 | // have been created for this location, so do not apply it now. | |
8851ecca | 2606 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2607 | { |
2608 | gold_assert(tls_segment != NULL); | |
2609 | value -= tls_segment->memsz(); | |
2610 | Relocate_functions<32, false>::rel32(view, value); | |
2611 | } | |
56622147 | 2612 | break; |
92e059d8 | 2613 | |
56622147 | 2614 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2615 | // If we're creating a shared library, a dynamic relocation will |
2616 | // have been created for this location, so do not apply it now. | |
8851ecca | 2617 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2618 | { |
2619 | gold_assert(tls_segment != NULL); | |
2620 | value = tls_segment->memsz() - value; | |
2621 | Relocate_functions<32, false>::rel32(view, value); | |
2622 | } | |
56622147 | 2623 | break; |
92e059d8 | 2624 | } |
92e059d8 ILT |
2625 | } |
2626 | ||
e041f13d | 2627 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2628 | // Local-Exec. |
2629 | ||
2630 | inline void | |
2631 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2632 | size_t relnum, | |
2633 | Output_segment* tls_segment, | |
2634 | const elfcpp::Rel<32, false>& rel, | |
2635 | unsigned int, | |
2636 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2637 | unsigned char* view, | |
fe8718a4 | 2638 | section_size_type view_size) |
ead1e424 ILT |
2639 | { |
2640 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2641 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2642 | // leal foo(%reg),%eax; call ___tls_get_addr |
2643 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2644 | ||
af6359d5 ILT |
2645 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2646 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2647 | |
2648 | unsigned char op1 = view[-1]; | |
2649 | unsigned char op2 = view[-2]; | |
2650 | ||
af6359d5 ILT |
2651 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2652 | op2 == 0x8d || op2 == 0x04); | |
2653 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2654 | |
2655 | int roff = 5; | |
2656 | ||
2657 | if (op2 == 0x04) | |
2658 | { | |
af6359d5 ILT |
2659 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2660 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2661 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2662 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2663 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2664 | } | |
2665 | else | |
2666 | { | |
af6359d5 ILT |
2667 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2668 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2669 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2670 | && view[9] == 0x90) |
ead1e424 ILT |
2671 | { |
2672 | // There is a trailing nop. Use the size byte subl. | |
2673 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2674 | roff = 6; | |
2675 | } | |
2676 | else | |
2677 | { | |
2678 | // Use the five byte subl. | |
2679 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2680 | } | |
2681 | } | |
2682 | ||
7bf1f802 | 2683 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2684 | Relocate_functions<32, false>::rel32(view + roff, value); |
2685 | ||
2686 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2687 | // We can skip it. | |
2688 | this->skip_call_tls_get_addr_ = true; | |
2689 | } | |
2690 | ||
7bf1f802 | 2691 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2692 | // Initial-Exec. |
2693 | ||
2694 | inline void | |
2695 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2696 | size_t relnum, | |
c2b45e22 | 2697 | Output_segment*, |
07f397ab ILT |
2698 | const elfcpp::Rel<32, false>& rel, |
2699 | unsigned int, | |
2700 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2701 | unsigned char* view, | |
fe8718a4 | 2702 | section_size_type view_size) |
07f397ab ILT |
2703 | { |
2704 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2705 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2706 | ||
2707 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2708 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2709 | ||
2710 | unsigned char op1 = view[-1]; | |
2711 | unsigned char op2 = view[-2]; | |
2712 | ||
2713 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2714 | op2 == 0x8d || op2 == 0x04); | |
2715 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2716 | ||
2717 | int roff = 5; | |
2718 | ||
c2b45e22 CC |
2719 | // FIXME: For now, support only the first (SIB) form. |
2720 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2721 | |
2722 | if (op2 == 0x04) | |
2723 | { | |
2724 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2725 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2726 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2727 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2728 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2729 | } | |
2730 | else | |
2731 | { | |
2732 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2733 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2734 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2735 | && view[9] == 0x90) |
2736 | { | |
2737 | // FIXME: This is not the right instruction sequence. | |
2738 | // There is a trailing nop. Use the size byte subl. | |
2739 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2740 | roff = 6; | |
2741 | } | |
2742 | else | |
2743 | { | |
2744 | // FIXME: This is not the right instruction sequence. | |
2745 | // Use the five byte subl. | |
2746 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2747 | } | |
2748 | } | |
2749 | ||
07f397ab ILT |
2750 | Relocate_functions<32, false>::rel32(view + roff, value); |
2751 | ||
2752 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2753 | // We can skip it. | |
2754 | this->skip_call_tls_get_addr_ = true; | |
2755 | } | |
2756 | ||
c2b45e22 CC |
2757 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2758 | // General-Dynamic to a Local-Exec. | |
2759 | ||
2760 | inline void | |
2761 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2762 | const Relocate_info<32, false>* relinfo, | |
2763 | size_t relnum, | |
2764 | Output_segment* tls_segment, | |
2765 | const elfcpp::Rel<32, false>& rel, | |
2766 | unsigned int r_type, | |
2767 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2768 | unsigned char* view, | |
2769 | section_size_type view_size) | |
2770 | { | |
2771 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2772 | { | |
2773 | // leal foo@TLSDESC(%ebx), %eax | |
2774 | // ==> leal foo@NTPOFF, %eax | |
2775 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2776 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2777 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2778 | view[-2] == 0x8d && view[-1] == 0x83); | |
2779 | view[-1] = 0x05; | |
2780 | value -= tls_segment->memsz(); | |
2781 | Relocate_functions<32, false>::rel32(view, value); | |
2782 | } | |
2783 | else | |
2784 | { | |
2785 | // call *foo@TLSCALL(%eax) | |
2786 | // ==> nop; nop | |
2787 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2788 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2789 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2790 | view[0] == 0xff && view[1] == 0x10); | |
2791 | view[0] = 0x66; | |
2792 | view[1] = 0x90; | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2797 | // General-Dynamic to an Initial-Exec. | |
2798 | ||
2799 | inline void | |
2800 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2801 | const Relocate_info<32, false>* relinfo, | |
2802 | size_t relnum, | |
2803 | Output_segment*, | |
2804 | const elfcpp::Rel<32, false>& rel, | |
2805 | unsigned int r_type, | |
2806 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2807 | unsigned char* view, | |
2808 | section_size_type view_size) | |
2809 | { | |
2810 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2811 | { | |
2812 | // leal foo@TLSDESC(%ebx), %eax | |
2813 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2814 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2815 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2816 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2817 | view[-2] == 0x8d && view[-1] == 0x83); | |
2818 | view[-2] = 0x8b; | |
2819 | Relocate_functions<32, false>::rel32(view, value); | |
2820 | } | |
2821 | else | |
2822 | { | |
2823 | // call *foo@TLSCALL(%eax) | |
2824 | // ==> nop; nop | |
2825 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2826 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2827 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2828 | view[0] == 0xff && view[1] == 0x10); | |
2829 | view[0] = 0x66; | |
2830 | view[1] = 0x90; | |
2831 | } | |
2832 | } | |
2833 | ||
46cf9fa2 ILT |
2834 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2835 | // Local-Exec. | |
2836 | ||
2837 | inline void | |
2838 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2839 | size_t relnum, | |
2840 | Output_segment*, | |
2841 | const elfcpp::Rel<32, false>& rel, | |
2842 | unsigned int, | |
2843 | elfcpp::Elf_types<32>::Elf_Addr, | |
2844 | unsigned char* view, | |
fe8718a4 | 2845 | section_size_type view_size) |
46cf9fa2 ILT |
2846 | { |
2847 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2848 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2849 | ||
af6359d5 ILT |
2850 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2851 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2852 | |
2853 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2854 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2855 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2856 | |
af6359d5 | 2857 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2858 | |
2859 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2860 | ||
2861 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2862 | // We can skip it. | |
2863 | this->skip_call_tls_get_addr_ = true; | |
2864 | } | |
2865 | ||
56622147 ILT |
2866 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2867 | // Local-Exec. | |
2868 | ||
2869 | inline void | |
2870 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2871 | size_t relnum, | |
2872 | Output_segment* tls_segment, | |
2873 | const elfcpp::Rel<32, false>& rel, | |
2874 | unsigned int r_type, | |
2875 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2876 | unsigned char* view, | |
fe8718a4 | 2877 | section_size_type view_size) |
56622147 ILT |
2878 | { |
2879 | // We have to actually change the instructions, which means that we | |
2880 | // need to examine the opcodes to figure out which instruction we | |
2881 | // are looking at. | |
2882 | if (r_type == elfcpp::R_386_TLS_IE) | |
2883 | { | |
2884 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2885 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2886 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2887 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2888 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2889 | ||
2890 | unsigned char op1 = view[-1]; | |
2891 | if (op1 == 0xa1) | |
2892 | { | |
2893 | // movl XX,%eax ==> movl $YY,%eax | |
2894 | view[-1] = 0xb8; | |
2895 | } | |
2896 | else | |
2897 | { | |
2898 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2899 | ||
2900 | unsigned char op2 = view[-2]; | |
2901 | if (op2 == 0x8b) | |
2902 | { | |
2903 | // movl XX,%reg ==> movl $YY,%reg | |
2904 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2905 | (op1 & 0xc7) == 0x05); | |
2906 | view[-2] = 0xc7; | |
2907 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2908 | } | |
2909 | else if (op2 == 0x03) | |
2910 | { | |
2911 | // addl XX,%reg ==> addl $YY,%reg | |
2912 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2913 | (op1 & 0xc7) == 0x05); | |
2914 | view[-2] = 0x81; | |
2915 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2916 | } | |
2917 | else | |
2918 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2919 | } | |
2920 | } | |
2921 | else | |
2922 | { | |
2923 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2924 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2925 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2926 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2927 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2928 | ||
2929 | unsigned char op1 = view[-1]; | |
2930 | unsigned char op2 = view[-2]; | |
2931 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2932 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2933 | if (op2 == 0x8b) | |
2934 | { | |
2935 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2936 | view[-2] = 0xc7; | |
2937 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2938 | } | |
2939 | else if (op2 == 0x2b) | |
2940 | { | |
2941 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2942 | view[-2] = 0x81; | |
2943 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2944 | } | |
2945 | else if (op2 == 0x03) | |
2946 | { | |
2947 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2948 | view[-2] = 0x81; | |
2949 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2950 | } | |
2951 | else | |
2952 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2953 | } | |
2954 | ||
7bf1f802 | 2955 | value = tls_segment->memsz() - value; |
56622147 ILT |
2956 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2957 | value = - value; | |
2958 | ||
2959 | Relocate_functions<32, false>::rel32(view, value); | |
2960 | } | |
2961 | ||
61ba1cf9 ILT |
2962 | // Relocate section data. |
2963 | ||
2964 | void | |
92e059d8 | 2965 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2966 | unsigned int sh_type, |
2967 | const unsigned char* prelocs, | |
2968 | size_t reloc_count, | |
730cdc88 ILT |
2969 | Output_section* output_section, |
2970 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2971 | unsigned char* view, |
2972 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2973 | section_size_type view_size, |
2974 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2975 | { |
a3ad94ed | 2976 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2977 | |
ead1e424 ILT |
2978 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2979 | Target_i386::Relocate>( | |
92e059d8 | 2980 | relinfo, |
ead1e424 | 2981 | this, |
61ba1cf9 ILT |
2982 | prelocs, |
2983 | reloc_count, | |
730cdc88 ILT |
2984 | output_section, |
2985 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2986 | view, |
2987 | address, | |
364c7fa5 ILT |
2988 | view_size, |
2989 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2990 | } |
2991 | ||
6a74a719 ILT |
2992 | // Return the size of a relocation while scanning during a relocatable |
2993 | // link. | |
2994 | ||
2995 | unsigned int | |
2996 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2997 | unsigned int r_type, | |
2998 | Relobj* object) | |
2999 | { | |
3000 | switch (r_type) | |
3001 | { | |
3002 | case elfcpp::R_386_NONE: | |
3003 | case elfcpp::R_386_GNU_VTINHERIT: | |
3004 | case elfcpp::R_386_GNU_VTENTRY: | |
3005 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3006 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3007 | case elfcpp::R_386_TLS_DESC_CALL: | |
3008 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3009 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3010 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3011 | case elfcpp::R_386_TLS_IE_32: | |
3012 | case elfcpp::R_386_TLS_GOTIE: | |
3013 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3014 | case elfcpp::R_386_TLS_LE_32: | |
3015 | return 0; | |
3016 | ||
3017 | case elfcpp::R_386_32: | |
3018 | case elfcpp::R_386_PC32: | |
3019 | case elfcpp::R_386_GOT32: | |
3020 | case elfcpp::R_386_PLT32: | |
3021 | case elfcpp::R_386_GOTOFF: | |
3022 | case elfcpp::R_386_GOTPC: | |
3023 | return 4; | |
3024 | ||
3025 | case elfcpp::R_386_16: | |
3026 | case elfcpp::R_386_PC16: | |
3027 | return 2; | |
3028 | ||
3029 | case elfcpp::R_386_8: | |
3030 | case elfcpp::R_386_PC8: | |
3031 | return 1; | |
3032 | ||
3033 | // These are relocations which should only be seen by the | |
3034 | // dynamic linker, and should never be seen here. | |
3035 | case elfcpp::R_386_COPY: | |
3036 | case elfcpp::R_386_GLOB_DAT: | |
3037 | case elfcpp::R_386_JUMP_SLOT: | |
3038 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3039 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3040 | case elfcpp::R_386_TLS_TPOFF: |
3041 | case elfcpp::R_386_TLS_DTPMOD32: | |
3042 | case elfcpp::R_386_TLS_DTPOFF32: | |
3043 | case elfcpp::R_386_TLS_TPOFF32: | |
3044 | case elfcpp::R_386_TLS_DESC: | |
3045 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3046 | return 0; | |
3047 | ||
3048 | case elfcpp::R_386_32PLT: | |
3049 | case elfcpp::R_386_TLS_GD_32: | |
3050 | case elfcpp::R_386_TLS_GD_PUSH: | |
3051 | case elfcpp::R_386_TLS_GD_CALL: | |
3052 | case elfcpp::R_386_TLS_GD_POP: | |
3053 | case elfcpp::R_386_TLS_LDM_32: | |
3054 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3055 | case elfcpp::R_386_TLS_LDM_CALL: | |
3056 | case elfcpp::R_386_TLS_LDM_POP: | |
3057 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3058 | default: | |
3059 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3060 | return 0; | |
3061 | } | |
3062 | } | |
3063 | ||
3064 | // Scan the relocs during a relocatable link. | |
3065 | ||
3066 | void | |
ad0f2072 | 3067 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
3068 | Layout* layout, |
3069 | Sized_relobj<32, false>* object, | |
3070 | unsigned int data_shndx, | |
3071 | unsigned int sh_type, | |
3072 | const unsigned char* prelocs, | |
3073 | size_t reloc_count, | |
3074 | Output_section* output_section, | |
3075 | bool needs_special_offset_handling, | |
3076 | size_t local_symbol_count, | |
3077 | const unsigned char* plocal_symbols, | |
3078 | Relocatable_relocs* rr) | |
3079 | { | |
3080 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3081 | ||
3082 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3083 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3084 | ||
7019cd25 | 3085 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3086 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3087 | symtab, |
3088 | layout, | |
3089 | object, | |
3090 | data_shndx, | |
3091 | prelocs, | |
3092 | reloc_count, | |
3093 | output_section, | |
3094 | needs_special_offset_handling, | |
3095 | local_symbol_count, | |
3096 | plocal_symbols, | |
3097 | rr); | |
3098 | } | |
3099 | ||
3100 | // Relocate a section during a relocatable link. | |
3101 | ||
3102 | void | |
3103 | Target_i386::relocate_for_relocatable( | |
3104 | const Relocate_info<32, false>* relinfo, | |
3105 | unsigned int sh_type, | |
3106 | const unsigned char* prelocs, | |
3107 | size_t reloc_count, | |
3108 | Output_section* output_section, | |
3109 | off_t offset_in_output_section, | |
3110 | const Relocatable_relocs* rr, | |
3111 | unsigned char* view, | |
3112 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3113 | section_size_type view_size, | |
3114 | unsigned char* reloc_view, | |
3115 | section_size_type reloc_view_size) | |
3116 | { | |
3117 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3118 | ||
7019cd25 | 3119 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3120 | relinfo, |
3121 | prelocs, | |
3122 | reloc_count, | |
3123 | output_section, | |
3124 | offset_in_output_section, | |
3125 | rr, | |
3126 | view, | |
3127 | view_address, | |
3128 | view_size, | |
3129 | reloc_view, | |
3130 | reloc_view_size); | |
3131 | } | |
3132 | ||
ab5c9e90 ILT |
3133 | // Return the value to use for a dynamic which requires special |
3134 | // treatment. This is how we support equality comparisons of function | |
3135 | // pointers across shared library boundaries, as described in the | |
3136 | // processor specific ABI supplement. | |
3137 | ||
3138 | uint64_t | |
3139 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3140 | { | |
3141 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3142 | return this->plt_section()->address() + gsym->plt_offset(); | |
3143 | } | |
3144 | ||
c51e6221 ILT |
3145 | // Return a string used to fill a code section with nops to take up |
3146 | // the specified length. | |
3147 | ||
3148 | std::string | |
8851ecca | 3149 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3150 | { |
3151 | if (length >= 16) | |
3152 | { | |
3153 | // Build a jmp instruction to skip over the bytes. | |
3154 | unsigned char jmp[5]; | |
3155 | jmp[0] = 0xe9; | |
3156 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3157 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3158 | + std::string(length - 5, '\0')); | |
3159 | } | |
3160 | ||
3161 | // Nop sequences of various lengths. | |
3162 | const char nop1[1] = { 0x90 }; // nop | |
3163 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3164 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3165 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3166 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3167 | 0x00 }; // leal 0(%esi,1),%esi | |
3168 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3169 | 0x00, 0x00 }; | |
3170 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3171 | 0x00, 0x00, 0x00 }; | |
3172 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3173 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3174 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3175 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3176 | 0x00 }; | |
3177 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3178 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3179 | 0x00, 0x00 }; | |
3180 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3181 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3182 | 0x00, 0x00, 0x00 }; | |
3183 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3184 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3185 | 0x00, 0x00, 0x00, 0x00 }; | |
3186 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3187 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3188 | 0x27, 0x00, 0x00, 0x00, | |
3189 | 0x00 }; | |
3190 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3191 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3192 | 0xbc, 0x27, 0x00, 0x00, | |
3193 | 0x00, 0x00 }; | |
3194 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3195 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3196 | 0x90, 0x90, 0x90, 0x90, | |
3197 | 0x90, 0x90, 0x90 }; | |
3198 | ||
3199 | const char* nops[16] = { | |
3200 | NULL, | |
3201 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3202 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3203 | }; | |
3204 | ||
3205 | return std::string(nops[length], length); | |
3206 | } | |
3207 | ||
b6848d3c ILT |
3208 | // Return whether SYM should be treated as a call to a non-split |
3209 | // function. We don't want that to be true of a call to a | |
3210 | // get_pc_thunk function. | |
3211 | ||
3212 | bool | |
3213 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3214 | { | |
3215 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3216 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3217 | } | |
3218 | ||
364c7fa5 ILT |
3219 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
3220 | // compiled with -fstack-split. The function calls non-stack-split | |
3221 | // code. We have to change the function so that it always ensures | |
3222 | // that it has enough stack space to run some random function. | |
3223 | ||
3224 | void | |
3225 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3226 | section_offset_type fnoffset, | |
3227 | section_size_type fnsize, | |
3228 | unsigned char* view, | |
3229 | section_size_type view_size, | |
3230 | std::string* from, | |
3231 | std::string* to) const | |
3232 | { | |
3233 | // The function starts with a comparison of the stack pointer and a | |
3234 | // field in the TCB. This is followed by a jump. | |
3235 | ||
3236 | // cmp %gs:NN,%esp | |
3237 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3238 | && fnsize > 7) | |
3239 | { | |
3240 | // We will call __morestack if the carry flag is set after this | |
3241 | // comparison. We turn the comparison into an stc instruction | |
3242 | // and some nops. | |
3243 | view[fnoffset] = '\xf9'; | |
3244 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3245 | } | |
3246 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3247 | // lea NN(%esp),%edx |
3248 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3249 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3250 | && fnsize > 7) |
3251 | { | |
3252 | // This is loading an offset from the stack pointer for a | |
3253 | // comparison. The offset is negative, so we decrease the | |
3254 | // offset by the amount of space we need for the stack. This | |
3255 | // means we will avoid calling __morestack if there happens to | |
3256 | // be plenty of space on the stack already. | |
3257 | unsigned char* pval = view + fnoffset + 3; | |
3258 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3259 | val -= parameters->options().split_stack_adjust_size(); | |
3260 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3261 | } | |
3262 | else | |
3263 | { | |
3264 | if (!object->has_no_split_stack()) | |
3265 | object->error(_("failed to match split-stack sequence at " | |
3266 | "section %u offset %0zx"), | |
ac33a407 | 3267 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3268 | return; |
3269 | } | |
3270 | ||
3271 | // We have to change the function so that it calls | |
3272 | // __morestack_non_split instead of __morestack. The former will | |
3273 | // allocate additional stack space. | |
3274 | *from = "__morestack"; | |
3275 | *to = "__morestack_non_split"; | |
3276 | } | |
3277 | ||
14bfc3f5 ILT |
3278 | // The selector for i386 object files. |
3279 | ||
36959681 | 3280 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3281 | { |
3282 | public: | |
3283 | Target_selector_i386() | |
36959681 ILT |
3284 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
3285 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
3286 | { } |
3287 | ||
3288 | Target* | |
e96caa79 ILT |
3289 | do_instantiate_target() |
3290 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3291 | }; |
3292 | ||
14bfc3f5 ILT |
3293 | Target_selector_i386 target_selector_i386; |
3294 | ||
3295 | } // End anonymous namespace. |