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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
b3ce541e | 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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 | |
6fa2a40b | 63 | add_local_ifunc_entry(Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
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 | { | |
6fa2a40b | 136 | Sized_relobj_file<32, false>* object; |
7223e9ca ILT |
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 | |
6d03d481 ST |
174 | // Process the relocations to determine unreferenced sections for |
175 | // garbage collection. | |
176 | void | |
ad0f2072 | 177 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 178 | Layout* layout, |
6fa2a40b | 179 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
180 | unsigned int data_shndx, |
181 | unsigned int sh_type, | |
182 | const unsigned char* prelocs, | |
183 | size_t reloc_count, | |
184 | Output_section* output_section, | |
185 | bool needs_special_offset_handling, | |
186 | size_t local_symbol_count, | |
187 | const unsigned char* plocal_symbols); | |
188 | ||
92e059d8 | 189 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 190 | void |
ad0f2072 | 191 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 192 | Layout* layout, |
6fa2a40b | 193 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 194 | unsigned int data_shndx, |
92e059d8 ILT |
195 | unsigned int sh_type, |
196 | const unsigned char* prelocs, | |
197 | size_t reloc_count, | |
730cdc88 ILT |
198 | Output_section* output_section, |
199 | bool needs_special_offset_handling, | |
92e059d8 | 200 | size_t local_symbol_count, |
730cdc88 | 201 | const unsigned char* plocal_symbols); |
61ba1cf9 | 202 | |
5a6f7e2d ILT |
203 | // Finalize the sections. |
204 | void | |
f59f41f3 | 205 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 206 | |
ab5c9e90 ILT |
207 | // Return the value to use for a dynamic which requires special |
208 | // treatment. | |
209 | uint64_t | |
210 | do_dynsym_value(const Symbol*) const; | |
211 | ||
92e059d8 ILT |
212 | // Relocate a section. |
213 | void | |
214 | relocate_section(const Relocate_info<32, false>*, | |
215 | unsigned int sh_type, | |
216 | const unsigned char* prelocs, | |
217 | size_t reloc_count, | |
730cdc88 ILT |
218 | Output_section* output_section, |
219 | bool needs_special_offset_handling, | |
92e059d8 ILT |
220 | unsigned char* view, |
221 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
222 | section_size_type view_size, |
223 | const Reloc_symbol_changes*); | |
92e059d8 | 224 | |
6a74a719 ILT |
225 | // Scan the relocs during a relocatable link. |
226 | void | |
ad0f2072 | 227 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 228 | Layout* layout, |
6fa2a40b | 229 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
230 | unsigned int data_shndx, |
231 | unsigned int sh_type, | |
232 | const unsigned char* prelocs, | |
233 | size_t reloc_count, | |
234 | Output_section* output_section, | |
235 | bool needs_special_offset_handling, | |
236 | size_t local_symbol_count, | |
237 | const unsigned char* plocal_symbols, | |
238 | Relocatable_relocs*); | |
239 | ||
240 | // Relocate a section during a relocatable link. | |
241 | void | |
242 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
243 | unsigned int sh_type, | |
244 | const unsigned char* prelocs, | |
245 | size_t reloc_count, | |
246 | Output_section* output_section, | |
247 | off_t offset_in_output_section, | |
248 | const Relocatable_relocs*, | |
249 | unsigned char* view, | |
250 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
251 | section_size_type view_size, | |
252 | unsigned char* reloc_view, | |
253 | section_size_type reloc_view_size); | |
254 | ||
c51e6221 ILT |
255 | // Return a string used to fill a code section with nops. |
256 | std::string | |
8851ecca | 257 | do_code_fill(section_size_type length) const; |
c51e6221 | 258 | |
9a2d6984 ILT |
259 | // Return whether SYM is defined by the ABI. |
260 | bool | |
9c2d0ef9 | 261 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
262 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
263 | ||
bb04269c DK |
264 | // Return whether a symbol name implies a local label. The UnixWare |
265 | // 2.1 cc generates temporary symbols that start with .X, so we | |
266 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
267 | // If so, we should move the .X recognition into | |
268 | // Target::do_is_local_label_name. | |
269 | bool | |
270 | do_is_local_label_name(const char* name) const | |
271 | { | |
272 | if (name[0] == '.' && name[1] == 'X') | |
273 | return true; | |
274 | return Target::do_is_local_label_name(name); | |
275 | } | |
276 | ||
7223e9ca ILT |
277 | // Return the PLT section. |
278 | Output_data* | |
279 | do_plt_section_for_global(const Symbol*) const | |
280 | { return this->plt_section(); } | |
281 | ||
282 | Output_data* | |
283 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
284 | { return this->plt_section(); } | |
285 | ||
b3ce541e ILT |
286 | // We can tell whether we take the address of a function. |
287 | inline bool | |
288 | do_can_check_for_function_pointers() const | |
289 | { return true; } | |
290 | ||
b6848d3c ILT |
291 | // Return whether SYM is call to a non-split function. |
292 | bool | |
293 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
294 | ||
9b547ce6 | 295 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
296 | void |
297 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
298 | section_offset_type fnoffset, section_size_type fnsize, | |
299 | unsigned char* view, section_size_type view_size, | |
300 | std::string* from, std::string* to) const; | |
301 | ||
96f2030e | 302 | // Return the size of the GOT section. |
fe8718a4 | 303 | section_size_type |
0e70b911 | 304 | got_size() const |
96f2030e ILT |
305 | { |
306 | gold_assert(this->got_ != NULL); | |
307 | return this->got_->data_size(); | |
308 | } | |
309 | ||
0e70b911 CC |
310 | // Return the number of entries in the GOT. |
311 | unsigned int | |
312 | got_entry_count() const | |
313 | { | |
314 | if (this->got_ == NULL) | |
315 | return 0; | |
316 | return this->got_size() / 4; | |
317 | } | |
318 | ||
319 | // Return the number of entries in the PLT. | |
320 | unsigned int | |
321 | plt_entry_count() const; | |
322 | ||
323 | // Return the offset of the first non-reserved PLT entry. | |
324 | unsigned int | |
325 | first_plt_entry_offset() const; | |
326 | ||
327 | // Return the size of each PLT entry. | |
328 | unsigned int | |
329 | plt_entry_size() const; | |
330 | ||
92e059d8 ILT |
331 | private: |
332 | // The class which scans relocations. | |
333 | struct Scan | |
61ba1cf9 | 334 | { |
95a2c8d6 RS |
335 | static inline int |
336 | ||
337 | get_reference_flags(unsigned int r_type); | |
338 | ||
61ba1cf9 | 339 | inline void |
ad0f2072 | 340 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 341 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 342 | unsigned int data_shndx, |
07f397ab | 343 | Output_section* output_section, |
92e059d8 ILT |
344 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
345 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 346 | |
92e059d8 | 347 | inline void |
ad0f2072 | 348 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 349 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 350 | unsigned int data_shndx, |
07f397ab | 351 | Output_section* output_section, |
92e059d8 ILT |
352 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
353 | Symbol* gsym); | |
af6359d5 | 354 | |
21bb3914 | 355 | inline bool |
0897ed3b ST |
356 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
357 | Target_i386* target, | |
6fa2a40b | 358 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
359 | unsigned int data_shndx, |
360 | Output_section* output_section, | |
361 | const elfcpp::Rel<32, false>& reloc, | |
362 | unsigned int r_type, | |
363 | const elfcpp::Sym<32, false>& lsym); | |
364 | ||
365 | inline bool | |
366 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
367 | Target_i386* target, | |
6fa2a40b | 368 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
369 | unsigned int data_shndx, |
370 | Output_section* output_section, | |
371 | const elfcpp::Rel<32, false>& reloc, | |
372 | unsigned int r_type, | |
373 | Symbol* gsym); | |
21bb3914 ST |
374 | |
375 | inline bool | |
0897ed3b | 376 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 377 | |
7223e9ca | 378 | bool |
6fa2a40b CC |
379 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
380 | unsigned int r_type); | |
7223e9ca | 381 | |
af6359d5 | 382 | static void |
6fa2a40b | 383 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
384 | |
385 | static void | |
6fa2a40b | 386 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 387 | Symbol*); |
61ba1cf9 ILT |
388 | }; |
389 | ||
92e059d8 ILT |
390 | // The class which implements relocation. |
391 | class Relocate | |
392 | { | |
393 | public: | |
ead1e424 | 394 | Relocate() |
46cf9fa2 | 395 | : skip_call_tls_get_addr_(false), |
82bb573a | 396 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
397 | { } |
398 | ||
399 | ~Relocate() | |
400 | { | |
401 | if (this->skip_call_tls_get_addr_) | |
402 | { | |
403 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 404 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
405 | } |
406 | } | |
407 | ||
86849f1f ILT |
408 | // Return whether the static relocation needs to be applied. |
409 | inline bool | |
410 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 411 | unsigned int r_type, |
031cdbed ILT |
412 | bool is_32bit, |
413 | Output_section* output_section); | |
86849f1f | 414 | |
ead1e424 ILT |
415 | // Do a relocation. Return false if the caller should not issue |
416 | // any warnings about this relocation. | |
417 | inline bool | |
031cdbed ILT |
418 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
419 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 420 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 421 | const Symbol_value<32>*, |
92e059d8 | 422 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 423 | section_size_type); |
92e059d8 ILT |
424 | |
425 | private: | |
426 | // Do a TLS relocation. | |
ead1e424 | 427 | inline void |
07f397ab ILT |
428 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
429 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 430 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 431 | const Symbol_value<32>*, |
fe8718a4 ILT |
432 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
433 | section_size_type); | |
92e059d8 | 434 | |
07f397ab ILT |
435 | // Do a TLS General-Dynamic to Initial-Exec transition. |
436 | inline void | |
437 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
438 | Output_segment* tls_segment, | |
439 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
440 | elfcpp::Elf_types<32>::Elf_Addr value, | |
441 | unsigned char* view, | |
fe8718a4 | 442 | section_size_type view_size); |
07f397ab | 443 | |
56622147 ILT |
444 | // Do a TLS General-Dynamic to Local-Exec transition. |
445 | inline void | |
446 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
447 | Output_segment* tls_segment, |
448 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
449 | elfcpp::Elf_types<32>::Elf_Addr value, | |
450 | unsigned char* view, | |
fe8718a4 | 451 | section_size_type view_size); |
92e059d8 | 452 | |
c2b45e22 CC |
453 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
454 | // transition. | |
455 | inline void | |
456 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
457 | Output_segment* tls_segment, | |
458 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
459 | elfcpp::Elf_types<32>::Elf_Addr value, | |
460 | unsigned char* view, | |
461 | section_size_type view_size); | |
462 | ||
463 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
464 | // transition. | |
465 | inline void | |
466 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
467 | Output_segment* tls_segment, | |
468 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
469 | elfcpp::Elf_types<32>::Elf_Addr value, | |
470 | unsigned char* view, | |
471 | section_size_type view_size); | |
472 | ||
56622147 | 473 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 474 | inline void |
56622147 | 475 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
476 | Output_segment* tls_segment, |
477 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
478 | elfcpp::Elf_types<32>::Elf_Addr value, | |
479 | unsigned char* view, | |
fe8718a4 | 480 | section_size_type view_size); |
ead1e424 | 481 | |
56622147 ILT |
482 | // Do a TLS Initial-Exec to Local-Exec transition. |
483 | static inline void | |
484 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
485 | Output_segment* tls_segment, |
486 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
487 | elfcpp::Elf_types<32>::Elf_Addr value, | |
488 | unsigned char* view, | |
fe8718a4 | 489 | section_size_type view_size); |
46cf9fa2 | 490 | |
46cf9fa2 ILT |
491 | // We need to keep track of which type of local dynamic relocation |
492 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
493 | enum Local_dynamic_type | |
494 | { | |
495 | LOCAL_DYNAMIC_NONE, | |
496 | LOCAL_DYNAMIC_SUN, | |
497 | LOCAL_DYNAMIC_GNU | |
498 | }; | |
499 | ||
ead1e424 ILT |
500 | // This is set if we should skip the next reloc, which should be a |
501 | // PLT32 reloc against ___tls_get_addr. | |
502 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
503 | // The type of local dynamic relocation we have seen in the section |
504 | // being relocated, if any. | |
505 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
506 | }; |
507 | ||
6a74a719 ILT |
508 | // A class which returns the size required for a relocation type, |
509 | // used while scanning relocs during a relocatable link. | |
510 | class Relocatable_size_for_reloc | |
511 | { | |
512 | public: | |
513 | unsigned int | |
514 | get_size_for_reloc(unsigned int, Relobj*); | |
515 | }; | |
516 | ||
92e059d8 ILT |
517 | // Adjust TLS relocation type based on the options and whether this |
518 | // is a local symbol. | |
af6359d5 | 519 | static tls::Tls_optimization |
7e1edb90 | 520 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 521 | |
ead1e424 | 522 | // Get the GOT section, creating it if necessary. |
dbe717ef | 523 | Output_data_got<32, false>* |
7e1edb90 | 524 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 525 | |
96f2030e ILT |
526 | // Get the GOT PLT section. |
527 | Output_data_space* | |
528 | got_plt_section() const | |
529 | { | |
530 | gold_assert(this->got_plt_ != NULL); | |
531 | return this->got_plt_; | |
532 | } | |
533 | ||
a8df5856 ILT |
534 | // Get the GOT section for TLSDESC entries. |
535 | Output_data_got<32, false>* | |
536 | got_tlsdesc_section() const | |
537 | { | |
538 | gold_assert(this->got_tlsdesc_ != NULL); | |
539 | return this->got_tlsdesc_; | |
540 | } | |
541 | ||
7223e9ca ILT |
542 | // Create the PLT section. |
543 | void | |
544 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
545 | ||
a3ad94ed ILT |
546 | // Create a PLT entry for a global symbol. |
547 | void | |
7e1edb90 | 548 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 549 | |
7223e9ca ILT |
550 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
551 | void | |
552 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 553 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
554 | unsigned int local_sym_index); |
555 | ||
9fa33bee | 556 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
557 | void |
558 | define_tls_base_symbol(Symbol_table*, Layout*); | |
559 | ||
94c4710f ILT |
560 | // Create a GOT entry for the TLS module index. |
561 | unsigned int | |
562 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 563 | Sized_relobj_file<32, false>* object); |
94c4710f | 564 | |
a3ad94ed | 565 | // Get the PLT section. |
e291e7b9 | 566 | Output_data_plt_i386* |
a3ad94ed ILT |
567 | plt_section() const |
568 | { | |
569 | gold_assert(this->plt_ != NULL); | |
570 | return this->plt_; | |
571 | } | |
572 | ||
5a6f7e2d ILT |
573 | // Get the dynamic reloc section, creating it if necessary. |
574 | Reloc_section* | |
575 | rel_dyn_section(Layout*); | |
576 | ||
e291e7b9 ILT |
577 | // Get the section to use for TLS_DESC relocations. |
578 | Reloc_section* | |
579 | rel_tls_desc_section(Layout*) const; | |
580 | ||
12c0daef | 581 | // Add a potential copy relocation. |
a3ad94ed | 582 | void |
ef9beddf | 583 | copy_reloc(Symbol_table* symtab, Layout* layout, |
6fa2a40b | 584 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
585 | unsigned int shndx, Output_section* output_section, |
586 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
587 | { | |
588 | this->copy_relocs_.copy_reloc(symtab, layout, | |
589 | symtab->get_sized_symbol<32>(sym), | |
590 | object, shndx, output_section, reloc, | |
591 | this->rel_dyn_section(layout)); | |
592 | } | |
ead1e424 | 593 | |
92e059d8 ILT |
594 | // Information about this specific target which we pass to the |
595 | // general Target structure. | |
75f65a3e | 596 | static const Target::Target_info i386_info; |
ead1e424 | 597 | |
0a65a3a7 | 598 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
599 | // These values are exposed to the ABI in an incremental link. |
600 | // Do not renumber existing values without changing the version | |
601 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
602 | enum Got_type |
603 | { | |
604 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
605 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
606 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
607 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
608 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
609 | }; |
610 | ||
ead1e424 | 611 | // The GOT section. |
dbe717ef | 612 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
613 | // The PLT section. |
614 | Output_data_plt_i386* plt_; | |
615 | // The GOT PLT section. | |
616 | Output_data_space* got_plt_; | |
a8df5856 ILT |
617 | // The GOT section for TLSDESC relocations. |
618 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
619 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
620 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
621 | // The dynamic reloc section. |
622 | Reloc_section* rel_dyn_; | |
623 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 624 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
625 | // Space for variables copied with a COPY reloc. |
626 | Output_data_space* dynbss_; | |
c2b45e22 | 627 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 628 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
629 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
630 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
631 | }; |
632 | ||
633 | const Target::Target_info Target_i386::i386_info = | |
634 | { | |
61ba1cf9 ILT |
635 | 32, // size |
636 | false, // is_big_endian | |
637 | elfcpp::EM_386, // machine_code | |
638 | false, // has_make_symbol | |
dbe717ef | 639 | false, // has_resolve |
c51e6221 | 640 | true, // has_code_fill |
35cdfc9a | 641 | true, // is_default_stack_executable |
b3ce541e | 642 | true, // can_icf_inline_merge_sections |
0864d551 | 643 | '\0', // wrap_char |
dbe717ef | 644 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 645 | 0x08048000, // default_text_segment_address |
cd72c291 | 646 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
647 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
648 | elfcpp::SHN_UNDEF, // small_common_shndx | |
649 | elfcpp::SHN_UNDEF, // large_common_shndx | |
650 | 0, // small_common_section_flags | |
05a352e6 DK |
651 | 0, // large_common_section_flags |
652 | NULL, // attributes_section | |
653 | NULL // attributes_vendor | |
14bfc3f5 ILT |
654 | }; |
655 | ||
ead1e424 ILT |
656 | // Get the GOT section, creating it if necessary. |
657 | ||
dbe717ef | 658 | Output_data_got<32, false>* |
7e1edb90 | 659 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
660 | { |
661 | if (this->got_ == NULL) | |
662 | { | |
7e1edb90 | 663 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 664 | |
7e1edb90 | 665 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 666 | |
82742395 ILT |
667 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
668 | (elfcpp::SHF_ALLOC | |
669 | | elfcpp::SHF_WRITE), | |
22f0da72 | 670 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 671 | |
7d9e3d98 | 672 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
673 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
674 | (elfcpp::SHF_ALLOC | |
675 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
676 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
677 | false); | |
a3ad94ed | 678 | |
ead1e424 | 679 | // The first three entries are reserved. |
27bc2bce | 680 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 681 | |
1a2dff53 ILT |
682 | // Those bytes can go into the relro segment. |
683 | layout->increase_relro(3 * 4); | |
684 | ||
a3ad94ed | 685 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
686 | this->global_offset_table_ = |
687 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
688 | Symbol_table::PREDEFINED, | |
689 | this->got_plt_, | |
690 | 0, 0, elfcpp::STT_OBJECT, | |
691 | elfcpp::STB_LOCAL, | |
692 | elfcpp::STV_HIDDEN, 0, | |
693 | false, false); | |
a8df5856 ILT |
694 | |
695 | // If there are any TLSDESC relocations, they get GOT entries in | |
696 | // .got.plt after the jump slot entries. | |
697 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
698 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
699 | (elfcpp::SHF_ALLOC | |
700 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
701 | this->got_tlsdesc_, |
702 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 703 | } |
a3ad94ed | 704 | |
ead1e424 ILT |
705 | return this->got_; |
706 | } | |
707 | ||
5a6f7e2d ILT |
708 | // Get the dynamic reloc section, creating it if necessary. |
709 | ||
710 | Target_i386::Reloc_section* | |
711 | Target_i386::rel_dyn_section(Layout* layout) | |
712 | { | |
713 | if (this->rel_dyn_ == NULL) | |
714 | { | |
715 | gold_assert(layout != NULL); | |
d98bc257 | 716 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 717 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
718 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
719 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
720 | } |
721 | return this->rel_dyn_; | |
722 | } | |
723 | ||
a3ad94ed ILT |
724 | // Create the PLT section. The ordinary .got section is an argument, |
725 | // since we need to refer to the start. We also create our own .got | |
726 | // section just for PLT entries. | |
727 | ||
7223e9ca ILT |
728 | Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab, |
729 | Layout* layout, | |
7e1edb90 | 730 | Output_data_space* got_plt) |
7223e9ca ILT |
731 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0), |
732 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 733 | { |
d98bc257 | 734 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 735 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
736 | elfcpp::SHF_ALLOC, this->rel_, |
737 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
738 | |
739 | if (parameters->doing_static_link()) | |
740 | { | |
741 | // A statically linked executable will only have a .rel.plt | |
742 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
743 | // symbols. The library will use these symbols to locate the | |
744 | // IRELATIVE relocs at program startup time. | |
745 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
746 | Symbol_table::PREDEFINED, | |
747 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
748 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
749 | 0, false, true); | |
750 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
751 | Symbol_table::PREDEFINED, | |
752 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
753 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
754 | 0, true, true); | |
755 | } | |
a3ad94ed ILT |
756 | } |
757 | ||
16649710 ILT |
758 | void |
759 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
760 | { | |
761 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
762 | // linker, and so do we. | |
763 | os->set_entsize(4); | |
764 | } | |
765 | ||
a3ad94ed ILT |
766 | // Add an entry to the PLT. |
767 | ||
768 | void | |
769 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
770 | { | |
771 | gold_assert(!gsym->has_plt_offset()); | |
772 | ||
773 | // Note that when setting the PLT offset we skip the initial | |
774 | // reserved PLT entry. | |
775 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
776 | ||
777 | ++this->count_; | |
778 | ||
fe8718a4 | 779 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
780 | |
781 | // Every PLT entry needs a GOT entry which points back to the PLT | |
782 | // entry (this will be changed by the dynamic linker, normally | |
783 | // lazily when the function is called). | |
27bc2bce | 784 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
785 | |
786 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
787 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
788 | && gsym->can_use_relative_reloc(false)) | |
789 | { | |
790 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
791 | this->got_plt_, got_offset); | |
792 | struct Global_ifunc gi; | |
793 | gi.sym = gsym; | |
794 | gi.got_offset = got_offset; | |
795 | this->global_ifuncs_.push_back(gi); | |
796 | } | |
797 | else | |
798 | { | |
799 | gsym->set_needs_dynsym_entry(); | |
800 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
801 | got_offset); | |
802 | } | |
a3ad94ed ILT |
803 | |
804 | // Note that we don't need to save the symbol. The contents of the | |
805 | // PLT are independent of which symbols are used. The symbols only | |
806 | // appear in the relocations. | |
807 | } | |
808 | ||
7223e9ca ILT |
809 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
810 | // the PLT offset. | |
811 | ||
812 | unsigned int | |
6fa2a40b CC |
813 | Output_data_plt_i386::add_local_ifunc_entry( |
814 | Sized_relobj_file<32, false>* relobj, | |
815 | unsigned int local_sym_index) | |
7223e9ca ILT |
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, | |
6fa2a40b | 1049 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
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, | |
6fa2a40b | 1125 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
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 | |
6fa2a40b | 1271 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
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 | |
6fa2a40b CC |
1282 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1283 | Sized_relobj_file<32, false>* object, | |
1284 | unsigned int r_type) | |
95a2c8d6 RS |
1285 | { |
1286 | int flags = Scan::get_reference_flags(r_type); | |
1287 | if (flags & Symbol::TLS_REF) | |
1288 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1289 | object->name().c_str(), r_type); | |
1290 | return flags != 0; | |
1291 | } | |
1292 | ||
92e059d8 ILT |
1293 | // Scan a relocation for a local symbol. |
1294 | ||
1295 | inline void | |
ad0f2072 | 1296 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1297 | Layout* layout, |
1298 | Target_i386* target, | |
6fa2a40b | 1299 | Sized_relobj_file<32, false>* object, |
1b64748b | 1300 | unsigned int data_shndx, |
07f397ab | 1301 | Output_section* output_section, |
1b64748b | 1302 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1303 | unsigned int r_type, |
7bf1f802 | 1304 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1305 | { |
7223e9ca ILT |
1306 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1307 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1308 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1309 | { | |
1310 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1311 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1312 | } | |
1313 | ||
92e059d8 ILT |
1314 | switch (r_type) |
1315 | { | |
1316 | case elfcpp::R_386_NONE: | |
1317 | case elfcpp::R_386_GNU_VTINHERIT: | |
1318 | case elfcpp::R_386_GNU_VTENTRY: | |
1319 | break; | |
1320 | ||
1321 | case elfcpp::R_386_32: | |
436ca963 ILT |
1322 | // If building a shared library (or a position-independent |
1323 | // executable), we need to create a dynamic relocation for | |
1324 | // this location. The relocation applied at link time will | |
1325 | // apply the link-time value, so we flag the location with | |
1326 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1327 | // relocate it easily. | |
8851ecca | 1328 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1329 | { |
1330 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1331 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1332 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1333 | output_section, data_shndx, | |
1334 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1335 | } |
1336 | break; | |
1337 | ||
1338 | case elfcpp::R_386_16: | |
1339 | case elfcpp::R_386_8: | |
1340 | // If building a shared library (or a position-independent | |
1341 | // executable), we need to create a dynamic relocation for | |
1342 | // this location. Because the addend needs to remain in the | |
1343 | // data section, we need to be careful not to apply this | |
1344 | // relocation statically. | |
8851ecca | 1345 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1346 | { |
1347 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1348 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1349 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1350 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1351 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1352 | else |
1353 | { | |
1354 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1355 | unsigned int shndx = lsym.get_st_shndx(); |
1356 | bool is_ordinary; | |
1357 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1358 | &is_ordinary); | |
1359 | if (!is_ordinary) | |
1360 | object->error(_("section symbol %u has bad shndx %u"), | |
1361 | r_sym, shndx); | |
1362 | else | |
1363 | rel_dyn->add_local_section(object, shndx, | |
1364 | r_type, output_section, | |
1365 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1366 | } |
436ca963 | 1367 | } |
92e059d8 ILT |
1368 | break; |
1369 | ||
1370 | case elfcpp::R_386_PC32: | |
1371 | case elfcpp::R_386_PC16: | |
1372 | case elfcpp::R_386_PC8: | |
1373 | break; | |
1374 | ||
df2efe71 ILT |
1375 | case elfcpp::R_386_PLT32: |
1376 | // Since we know this is a local symbol, we can handle this as a | |
1377 | // PC32 reloc. | |
1378 | break; | |
1379 | ||
ead1e424 ILT |
1380 | case elfcpp::R_386_GOTOFF: |
1381 | case elfcpp::R_386_GOTPC: | |
1382 | // We need a GOT section. | |
7e1edb90 | 1383 | target->got_section(symtab, layout); |
ead1e424 ILT |
1384 | break; |
1385 | ||
1b64748b ILT |
1386 | case elfcpp::R_386_GOT32: |
1387 | { | |
1388 | // The symbol requires a GOT entry. | |
1389 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1390 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1391 | |
1392 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1393 | // lets function pointers compare correctly with shared | |
1394 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1395 | bool is_new; | |
1396 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1397 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1398 | else | |
1399 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1400 | if (is_new) | |
1b64748b ILT |
1401 | { |
1402 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1403 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1404 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1405 | { |
1406 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1407 | unsigned int got_offset = |
1408 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1409 | rel_dyn->add_local_relative(object, r_sym, | |
1410 | elfcpp::R_386_RELATIVE, | |
1411 | got, got_offset); | |
1b64748b ILT |
1412 | } |
1413 | } | |
1414 | } | |
1415 | break; | |
1416 | ||
af6359d5 ILT |
1417 | // These are relocations which should only be seen by the |
1418 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1419 | case elfcpp::R_386_COPY: |
1420 | case elfcpp::R_386_GLOB_DAT: | |
1421 | case elfcpp::R_386_JUMP_SLOT: | |
1422 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1423 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1424 | case elfcpp::R_386_TLS_TPOFF: |
1425 | case elfcpp::R_386_TLS_DTPMOD32: | |
1426 | case elfcpp::R_386_TLS_DTPOFF32: | |
1427 | case elfcpp::R_386_TLS_TPOFF32: | |
1428 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1429 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1430 | object->name().c_str(), r_type); |
92e059d8 ILT |
1431 | break; |
1432 | ||
af6359d5 | 1433 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1434 | // linking. |
56622147 ILT |
1435 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1436 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1437 | case elfcpp::R_386_TLS_DESC_CALL: | |
1438 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1439 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1440 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1441 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1442 | case elfcpp::R_386_TLS_GOTIE: |
1443 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1444 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1445 | { |
8851ecca | 1446 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1447 | const tls::Tls_optimization optimized_type |
1448 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1449 | switch (r_type) |
1450 | { | |
56622147 | 1451 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1452 | if (optimized_type == tls::TLSOPT_NONE) |
1453 | { | |
1454 | // Create a pair of GOT entries for the module index and | |
1455 | // dtv-relative offset. | |
1456 | Output_data_got<32, false>* got | |
1457 | = target->got_section(symtab, layout); | |
1458 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1459 | unsigned int shndx = lsym.get_st_shndx(); |
1460 | bool is_ordinary; | |
1461 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1462 | if (!is_ordinary) | |
1463 | object->error(_("local symbol %u has bad shndx %u"), | |
1464 | r_sym, shndx); | |
1465 | else | |
1466 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1467 | GOT_TYPE_TLS_PAIR, | |
1468 | target->rel_dyn_section(layout), | |
1469 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1470 | } |
1471 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1472 | unsupported_reloc_local(object, r_type); | |
1473 | break; | |
1474 | ||
56622147 | 1475 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1476 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1477 | if (optimized_type == tls::TLSOPT_NONE) |
1478 | { | |
a8df5856 ILT |
1479 | // Create a double GOT entry with an R_386_TLS_DESC |
1480 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1481 | // lazily, so the GOT entry needs to be in an area in | |
1482 | // .got.plt, not .got. Call got_section to make sure | |
1483 | // the section has been created. | |
1484 | target->got_section(symtab, layout); | |
1485 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1486 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1487 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1488 | { | |
1489 | unsigned int got_offset = got->add_constant(0); | |
1490 | // The local symbol value is stored in the second | |
1491 | // GOT entry. | |
1492 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1493 | // That set the GOT offset of the local symbol to | |
1494 | // point to the second entry, but we want it to | |
1495 | // point to the first. | |
1496 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1497 | got_offset); | |
1498 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1499 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1500 | } | |
c2b45e22 CC |
1501 | } |
1502 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1503 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1504 | break; |
1505 | ||
c2b45e22 CC |
1506 | case elfcpp::R_386_TLS_DESC_CALL: |
1507 | break; | |
1508 | ||
56622147 | 1509 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1510 | if (optimized_type == tls::TLSOPT_NONE) |
1511 | { | |
1512 | // Create a GOT entry for the module index. | |
94c4710f | 1513 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1514 | } |
1515 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1516 | unsupported_reloc_local(object, r_type); |
1517 | break; | |
1518 | ||
56622147 | 1519 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1520 | break; |
1521 | ||
56622147 ILT |
1522 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1523 | case elfcpp::R_386_TLS_IE_32: | |
1524 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1525 | layout->set_has_static_tls(); |
07f397ab ILT |
1526 | if (optimized_type == tls::TLSOPT_NONE) |
1527 | { | |
7bf1f802 ILT |
1528 | // For the R_386_TLS_IE relocation, we need to create a |
1529 | // dynamic relocation when building a shared library. | |
1530 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1531 | && parameters->options().shared()) |
7bf1f802 ILT |
1532 | { |
1533 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1534 | unsigned int r_sym |
1535 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1536 | rel_dyn->add_local_relative(object, r_sym, | |
1537 | elfcpp::R_386_RELATIVE, | |
1538 | output_section, data_shndx, | |
1539 | reloc.get_r_offset()); | |
7bf1f802 | 1540 | } |
07f397ab ILT |
1541 | // Create a GOT entry for the tp-relative offset. |
1542 | Output_data_got<32, false>* got | |
1543 | = target->got_section(symtab, layout); | |
1544 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1545 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1546 | ? elfcpp::R_386_TLS_TPOFF32 | |
1547 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1548 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1549 | ? GOT_TYPE_TLS_OFFSET | |
1550 | : GOT_TYPE_TLS_NOFFSET); | |
1551 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1552 | target->rel_dyn_section(layout), |
1553 | dyn_r_type); | |
07f397ab ILT |
1554 | } |
1555 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1556 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1557 | break; |
af6359d5 | 1558 | |
56622147 ILT |
1559 | case elfcpp::R_386_TLS_LE: // Local-exec |
1560 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1561 | layout->set_has_static_tls(); |
07f397ab | 1562 | if (output_is_shared) |
7bf1f802 ILT |
1563 | { |
1564 | // We need to create a dynamic relocation. | |
dceae3c1 | 1565 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1566 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1567 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1568 | ? elfcpp::R_386_TLS_TPOFF32 | |
1569 | : elfcpp::R_386_TLS_TPOFF); | |
1570 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1571 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1572 | data_shndx, reloc.get_r_offset()); | |
1573 | } | |
56622147 ILT |
1574 | break; |
1575 | ||
af6359d5 ILT |
1576 | default: |
1577 | gold_unreachable(); | |
7e1edb90 ILT |
1578 | } |
1579 | } | |
92e059d8 ILT |
1580 | break; |
1581 | ||
92e059d8 ILT |
1582 | case elfcpp::R_386_32PLT: |
1583 | case elfcpp::R_386_TLS_GD_32: | |
1584 | case elfcpp::R_386_TLS_GD_PUSH: | |
1585 | case elfcpp::R_386_TLS_GD_CALL: | |
1586 | case elfcpp::R_386_TLS_GD_POP: | |
1587 | case elfcpp::R_386_TLS_LDM_32: | |
1588 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1589 | case elfcpp::R_386_TLS_LDM_CALL: | |
1590 | case elfcpp::R_386_TLS_LDM_POP: | |
1591 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1592 | default: | |
af6359d5 | 1593 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1594 | break; |
1595 | } | |
1596 | } | |
1597 | ||
af6359d5 ILT |
1598 | // Report an unsupported relocation against a global symbol. |
1599 | ||
1600 | void | |
6fa2a40b CC |
1601 | Target_i386::Scan::unsupported_reloc_global( |
1602 | Sized_relobj_file<32, false>* object, | |
1603 | unsigned int r_type, | |
1604 | Symbol* gsym) | |
af6359d5 | 1605 | { |
75f2446e | 1606 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1607 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1608 | } |
1609 | ||
0897ed3b ST |
1610 | inline bool |
1611 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1612 | { | |
1613 | switch (r_type) | |
1614 | { | |
1615 | case elfcpp::R_386_32: | |
1616 | case elfcpp::R_386_16: | |
1617 | case elfcpp::R_386_8: | |
1618 | case elfcpp::R_386_GOTOFF: | |
1619 | case elfcpp::R_386_GOT32: | |
1620 | { | |
1621 | return true; | |
1622 | } | |
1623 | default: | |
1624 | return false; | |
1625 | } | |
1626 | return false; | |
1627 | } | |
1628 | ||
1629 | inline bool | |
1630 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1631 | Symbol_table* , | |
1632 | Layout* , | |
1633 | Target_i386* , | |
6fa2a40b | 1634 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1635 | unsigned int , |
1636 | Output_section* , | |
1637 | const elfcpp::Rel<32, false>& , | |
1638 | unsigned int r_type, | |
1639 | const elfcpp::Sym<32, false>&) | |
1640 | { | |
1641 | return possible_function_pointer_reloc(r_type); | |
1642 | } | |
1643 | ||
1644 | inline bool | |
1645 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1646 | Symbol_table* , | |
1647 | Layout* , | |
1648 | Target_i386* , | |
6fa2a40b | 1649 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1650 | unsigned int , |
1651 | Output_section* , | |
1652 | const elfcpp::Rel<32, false>& , | |
1653 | unsigned int r_type, | |
1654 | Symbol*) | |
1655 | { | |
1656 | return possible_function_pointer_reloc(r_type); | |
1657 | } | |
1658 | ||
92e059d8 ILT |
1659 | // Scan a relocation for a global symbol. |
1660 | ||
1661 | inline void | |
ad0f2072 | 1662 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1663 | Layout* layout, |
1664 | Target_i386* target, | |
6fa2a40b | 1665 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 1666 | unsigned int data_shndx, |
07f397ab | 1667 | Output_section* output_section, |
a3ad94ed ILT |
1668 | const elfcpp::Rel<32, false>& reloc, |
1669 | unsigned int r_type, | |
92e059d8 ILT |
1670 | Symbol* gsym) |
1671 | { | |
7223e9ca ILT |
1672 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1673 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1674 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1675 | target->make_plt_entry(symtab, layout, gsym); | |
1676 | ||
92e059d8 ILT |
1677 | switch (r_type) |
1678 | { | |
1679 | case elfcpp::R_386_NONE: | |
1680 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1681 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1682 | break; |
1683 | ||
1684 | case elfcpp::R_386_32: | |
92e059d8 | 1685 | case elfcpp::R_386_16: |
92e059d8 | 1686 | case elfcpp::R_386_8: |
96f2030e | 1687 | { |
d61c6bd4 ILT |
1688 | // Make a PLT entry if necessary. |
1689 | if (gsym->needs_plt_entry()) | |
1690 | { | |
1691 | target->make_plt_entry(symtab, layout, gsym); | |
1692 | // Since this is not a PC-relative relocation, we may be | |
1693 | // taking the address of a function. In that case we need to | |
1694 | // set the entry in the dynamic symbol table to the address of | |
1695 | // the PLT entry. | |
8851ecca | 1696 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1697 | gsym->set_needs_dynsym_value(); |
1698 | } | |
1699 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1700 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1701 | { |
966d4097 | 1702 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1703 | { |
12c0daef | 1704 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1705 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1706 | } |
7223e9ca ILT |
1707 | else if (r_type == elfcpp::R_386_32 |
1708 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1709 | && gsym->can_use_relative_reloc(false) | |
1710 | && !gsym->is_from_dynobj() | |
1711 | && !gsym->is_undefined() | |
1712 | && !gsym->is_preemptible()) | |
1713 | { | |
1714 | // Use an IRELATIVE reloc for a locally defined | |
1715 | // STT_GNU_IFUNC symbol. This makes a function | |
1716 | // address in a PIE executable match the address in a | |
1717 | // shared library that it links against. | |
1718 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1719 | rel_dyn->add_symbolless_global_addend(gsym, | |
1720 | elfcpp::R_386_IRELATIVE, | |
1721 | output_section, | |
1722 | object, data_shndx, | |
1723 | reloc.get_r_offset()); | |
1724 | } | |
d61c6bd4 ILT |
1725 | else if (r_type == elfcpp::R_386_32 |
1726 | && gsym->can_use_relative_reloc(false)) | |
1727 | { | |
1728 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1729 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1730 | output_section, object, | |
1731 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1732 | } |
1733 | else | |
1734 | { | |
96f2030e | 1735 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1736 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1737 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1738 | } |
1739 | } | |
1740 | } | |
1741 | break; | |
1742 | ||
1743 | case elfcpp::R_386_PC32: | |
1744 | case elfcpp::R_386_PC16: | |
1745 | case elfcpp::R_386_PC8: | |
1746 | { | |
1747 | // Make a PLT entry if necessary. | |
1748 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1749 | { |
1750 | // These relocations are used for function calls only in | |
1751 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1752 | // we'll need a text relocation anyway, so we can skip the | |
1753 | // PLT entry and let the dynamic linker bind the call directly | |
1754 | // to the target. For smaller relocations, we should use a | |
1755 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1756 | if (!parameters->options().shared() |
7bf1f802 ILT |
1757 | || r_type != elfcpp::R_386_PC32) |
1758 | target->make_plt_entry(symtab, layout, gsym); | |
1759 | } | |
d61c6bd4 | 1760 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1761 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1762 | { |
966d4097 | 1763 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1764 | { |
12c0daef | 1765 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1766 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1767 | } |
86849f1f | 1768 | else |
d61c6bd4 ILT |
1769 | { |
1770 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1771 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1772 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1773 | } |
96f2030e ILT |
1774 | } |
1775 | } | |
92e059d8 ILT |
1776 | break; |
1777 | ||
ead1e424 | 1778 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1779 | { |
1780 | // The symbol requires a GOT entry. | |
7e1edb90 | 1781 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1782 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1783 | { |
1784 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1785 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1786 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1787 | else | |
1788 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1789 | } | |
7bf1f802 ILT |
1790 | else |
1791 | { | |
8462ae85 | 1792 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1793 | // GOT entry with a dynamic relocation. |
1794 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1795 | if (gsym->is_from_dynobj() |
1796 | || gsym->is_undefined() | |
7223e9ca ILT |
1797 | || gsym->is_preemptible() |
1798 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1799 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
1800 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1801 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1802 | else |
8462ae85 | 1803 | { |
7223e9ca ILT |
1804 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1805 | // offset into the GOT, so that function pointer | |
1806 | // comparisons work correctly. | |
1807 | bool is_new; | |
1808 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1809 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1810 | else | |
1811 | { | |
1812 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1813 | // Tell the dynamic linker to use the PLT address | |
1814 | // when resolving relocations. | |
1815 | if (gsym->is_from_dynobj() | |
1816 | && !parameters->options().shared()) | |
1817 | gsym->set_needs_dynsym_value(); | |
1818 | } | |
1819 | if (is_new) | |
1820 | { | |
1821 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1822 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
1823 | got, got_off); | |
1824 | } | |
8462ae85 ILT |
1825 | } |
1826 | } | |
1827 | } | |
ead1e424 ILT |
1828 | break; |
1829 | ||
1830 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1831 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1832 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1833 | if (gsym->final_value_is_known()) |
ead1e424 | 1834 | break; |
436ca963 ILT |
1835 | // If building a shared library, we can also skip the PLT entry |
1836 | // if the symbol is defined in the output file and is protected | |
1837 | // or hidden. | |
1838 | if (gsym->is_defined() | |
1839 | && !gsym->is_from_dynobj() | |
1840 | && !gsym->is_preemptible()) | |
1841 | break; | |
7e1edb90 | 1842 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1843 | break; |
1844 | ||
1845 | case elfcpp::R_386_GOTOFF: | |
1846 | case elfcpp::R_386_GOTPC: | |
1847 | // We need a GOT section. | |
7e1edb90 | 1848 | target->got_section(symtab, layout); |
ead1e424 ILT |
1849 | break; |
1850 | ||
af6359d5 ILT |
1851 | // These are relocations which should only be seen by the |
1852 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1853 | case elfcpp::R_386_COPY: |
1854 | case elfcpp::R_386_GLOB_DAT: | |
1855 | case elfcpp::R_386_JUMP_SLOT: | |
1856 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1857 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1858 | case elfcpp::R_386_TLS_TPOFF: |
1859 | case elfcpp::R_386_TLS_DTPMOD32: | |
1860 | case elfcpp::R_386_TLS_DTPOFF32: | |
1861 | case elfcpp::R_386_TLS_TPOFF32: | |
1862 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1863 | gold_error(_("%s: unexpected reloc %u in object file"), |
1864 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1865 | break; |
1866 | ||
d61c17ea ILT |
1867 | // These are initial tls relocs, which are expected when |
1868 | // linking. | |
56622147 ILT |
1869 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1870 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1871 | case elfcpp::R_386_TLS_DESC_CALL: | |
1872 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1873 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1874 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1875 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1876 | case elfcpp::R_386_TLS_GOTIE: |
1877 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1878 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1879 | { |
7e1edb90 | 1880 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1881 | const tls::Tls_optimization optimized_type |
1882 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1883 | switch (r_type) |
1884 | { | |
56622147 | 1885 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1886 | if (optimized_type == tls::TLSOPT_NONE) |
1887 | { | |
1888 | // Create a pair of GOT entries for the module index and | |
1889 | // dtv-relative offset. | |
1890 | Output_data_got<32, false>* got | |
1891 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1892 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1893 | target->rel_dyn_section(layout), |
1894 | elfcpp::R_386_TLS_DTPMOD32, | |
1895 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1896 | } |
1897 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1898 | { | |
1899 | // Create a GOT entry for the tp-relative offset. | |
1900 | Output_data_got<32, false>* got | |
1901 | = target->got_section(symtab, layout); | |
c2b45e22 | 1902 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1903 | target->rel_dyn_section(layout), |
c2b45e22 | 1904 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1905 | } |
1906 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1907 | unsupported_reloc_global(object, r_type, gsym); | |
1908 | break; | |
1909 | ||
56622147 | 1910 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1911 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1912 | if (optimized_type == tls::TLSOPT_NONE) |
1913 | { | |
a8df5856 ILT |
1914 | // Create a double GOT entry with an R_386_TLS_DESC |
1915 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1916 | // lazily, so the GOT entry needs to be in an area in | |
1917 | // .got.plt, not .got. Call got_section to make sure | |
1918 | // the section has been created. | |
1919 | target->got_section(symtab, layout); | |
1920 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1921 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1922 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1923 | elfcpp::R_386_TLS_DESC, 0); |
1924 | } | |
1925 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1926 | { | |
1927 | // Create a GOT entry for the tp-relative offset. | |
1928 | Output_data_got<32, false>* got | |
1929 | = target->got_section(symtab, layout); | |
1930 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1931 | target->rel_dyn_section(layout), | |
1932 | elfcpp::R_386_TLS_TPOFF); | |
1933 | } | |
1934 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1935 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1936 | break; |
1937 | ||
1938 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1939 | break; |
1940 | ||
56622147 | 1941 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1942 | if (optimized_type == tls::TLSOPT_NONE) |
1943 | { | |
1944 | // Create a GOT entry for the module index. | |
94c4710f | 1945 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1946 | } |
1947 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1948 | unsupported_reloc_global(object, r_type, gsym); |
1949 | break; | |
1950 | ||
56622147 | 1951 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1952 | break; |
1953 | ||
56622147 ILT |
1954 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1955 | case elfcpp::R_386_TLS_IE_32: | |
1956 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1957 | layout->set_has_static_tls(); |
07f397ab ILT |
1958 | if (optimized_type == tls::TLSOPT_NONE) |
1959 | { | |
7bf1f802 ILT |
1960 | // For the R_386_TLS_IE relocation, we need to create a |
1961 | // dynamic relocation when building a shared library. | |
1962 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1963 | && parameters->options().shared()) |
07f397ab | 1964 | { |
07f397ab | 1965 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1966 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1967 | output_section, object, | |
1968 | data_shndx, | |
1969 | reloc.get_r_offset()); | |
07f397ab | 1970 | } |
7bf1f802 ILT |
1971 | // Create a GOT entry for the tp-relative offset. |
1972 | Output_data_got<32, false>* got | |
1973 | = target->got_section(symtab, layout); | |
1974 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1975 | ? elfcpp::R_386_TLS_TPOFF32 | |
1976 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1977 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1978 | ? GOT_TYPE_TLS_OFFSET | |
1979 | : GOT_TYPE_TLS_NOFFSET); | |
1980 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1981 | target->rel_dyn_section(layout), |
1982 | dyn_r_type); | |
07f397ab ILT |
1983 | } |
1984 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1985 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1986 | break; |
af6359d5 | 1987 | |
56622147 ILT |
1988 | case elfcpp::R_386_TLS_LE: // Local-exec |
1989 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1990 | layout->set_has_static_tls(); |
8851ecca | 1991 | if (parameters->options().shared()) |
7bf1f802 ILT |
1992 | { |
1993 | // We need to create a dynamic relocation. | |
1994 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1995 | ? elfcpp::R_386_TLS_TPOFF32 | |
1996 | : elfcpp::R_386_TLS_TPOFF); | |
1997 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1998 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1999 | data_shndx, reloc.get_r_offset()); | |
2000 | } | |
56622147 ILT |
2001 | break; |
2002 | ||
af6359d5 ILT |
2003 | default: |
2004 | gold_unreachable(); | |
a3ad94ed ILT |
2005 | } |
2006 | } | |
92e059d8 ILT |
2007 | break; |
2008 | ||
92e059d8 ILT |
2009 | case elfcpp::R_386_32PLT: |
2010 | case elfcpp::R_386_TLS_GD_32: | |
2011 | case elfcpp::R_386_TLS_GD_PUSH: | |
2012 | case elfcpp::R_386_TLS_GD_CALL: | |
2013 | case elfcpp::R_386_TLS_GD_POP: | |
2014 | case elfcpp::R_386_TLS_LDM_32: | |
2015 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2016 | case elfcpp::R_386_TLS_LDM_CALL: | |
2017 | case elfcpp::R_386_TLS_LDM_POP: | |
2018 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2019 | default: | |
af6359d5 | 2020 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2021 | break; |
2022 | } | |
2023 | } | |
2024 | ||
6d03d481 ST |
2025 | // Process relocations for gc. |
2026 | ||
2027 | void | |
ad0f2072 | 2028 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 2029 | Layout* layout, |
6fa2a40b | 2030 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
2031 | unsigned int data_shndx, |
2032 | unsigned int, | |
2033 | const unsigned char* prelocs, | |
2034 | size_t reloc_count, | |
2035 | Output_section* output_section, | |
2036 | bool needs_special_offset_handling, | |
2037 | size_t local_symbol_count, | |
2038 | const unsigned char* plocal_symbols) | |
2039 | { | |
2040 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2041 | Target_i386::Scan, |
2042 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2043 | symtab, |
2044 | layout, | |
2045 | this, | |
2046 | object, | |
2047 | data_shndx, | |
2048 | prelocs, | |
2049 | reloc_count, | |
2050 | output_section, | |
2051 | needs_special_offset_handling, | |
2052 | local_symbol_count, | |
2053 | plocal_symbols); | |
2054 | } | |
2055 | ||
92e059d8 ILT |
2056 | // Scan relocations for a section. |
2057 | ||
2058 | void | |
ad0f2072 | 2059 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2060 | Layout* layout, |
6fa2a40b | 2061 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 2062 | unsigned int data_shndx, |
92e059d8 ILT |
2063 | unsigned int sh_type, |
2064 | const unsigned char* prelocs, | |
2065 | size_t reloc_count, | |
730cdc88 ILT |
2066 | Output_section* output_section, |
2067 | bool needs_special_offset_handling, | |
92e059d8 | 2068 | size_t local_symbol_count, |
730cdc88 | 2069 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2070 | { |
2071 | if (sh_type == elfcpp::SHT_RELA) | |
2072 | { | |
75f2446e ILT |
2073 | gold_error(_("%s: unsupported RELA reloc section"), |
2074 | object->name().c_str()); | |
2075 | return; | |
92e059d8 ILT |
2076 | } |
2077 | ||
ead1e424 ILT |
2078 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2079 | Target_i386::Scan>( | |
92e059d8 | 2080 | symtab, |
ead1e424 ILT |
2081 | layout, |
2082 | this, | |
92e059d8 | 2083 | object, |
a3ad94ed | 2084 | data_shndx, |
92e059d8 ILT |
2085 | prelocs, |
2086 | reloc_count, | |
730cdc88 ILT |
2087 | output_section, |
2088 | needs_special_offset_handling, | |
92e059d8 | 2089 | local_symbol_count, |
730cdc88 | 2090 | plocal_symbols); |
92e059d8 ILT |
2091 | } |
2092 | ||
16649710 | 2093 | // Finalize the sections. |
5a6f7e2d ILT |
2094 | |
2095 | void | |
f59f41f3 DK |
2096 | Target_i386::do_finalize_sections( |
2097 | Layout* layout, | |
2098 | const Input_objects*, | |
e785ec03 | 2099 | Symbol_table* symtab) |
5a6f7e2d | 2100 | { |
ea715a34 ILT |
2101 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2102 | ? NULL | |
2103 | : this->plt_->rel_plt()); | |
2104 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2105 | this->rel_dyn_, true, false); |
16649710 ILT |
2106 | |
2107 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2108 | // relocs. | |
12c0daef ILT |
2109 | if (this->copy_relocs_.any_saved_relocs()) |
2110 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2111 | |
2112 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2113 | // the .got.plt section. | |
2114 | Symbol* sym = this->global_offset_table_; | |
2115 | if (sym != NULL) | |
2116 | { | |
2117 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2118 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2119 | } | |
5a6f7e2d ILT |
2120 | } |
2121 | ||
86849f1f ILT |
2122 | // Return whether a direct absolute static relocation needs to be applied. |
2123 | // In cases where Scan::local() or Scan::global() has created | |
2124 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2125 | // of the relocation is carried in the data, and we must not | |
2126 | // apply the static relocation. | |
2127 | ||
2128 | inline bool | |
2129 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2130 | unsigned int r_type, |
031cdbed ILT |
2131 | bool is_32bit, |
2132 | Output_section* output_section) | |
86849f1f | 2133 | { |
031cdbed ILT |
2134 | // If the output section is not allocated, then we didn't call |
2135 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2136 | // the reloc here. | |
2137 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2138 | return true; | |
2139 | ||
95a2c8d6 RS |
2140 | int ref_flags = Scan::get_reference_flags(r_type); |
2141 | ||
d61c6bd4 ILT |
2142 | // For local symbols, we will have created a non-RELATIVE dynamic |
2143 | // relocation only if (a) the output is position independent, | |
2144 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2145 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2146 | if (gsym == NULL) |
8851ecca | 2147 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2148 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2149 | && !is_32bit); |
86849f1f | 2150 | |
0700cf32 ILT |
2151 | // For global symbols, we use the same helper routines used in the |
2152 | // scan pass. If we did not create a dynamic relocation, or if we | |
2153 | // created a RELATIVE dynamic relocation, we should apply the static | |
2154 | // relocation. | |
2155 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2156 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2157 | && gsym->can_use_relative_reloc(ref_flags | |
2158 | & Symbol::FUNCTION_CALL); | |
2159 | return !has_dyn || is_rel; | |
86849f1f ILT |
2160 | } |
2161 | ||
61ba1cf9 ILT |
2162 | // Perform a relocation. |
2163 | ||
ead1e424 | 2164 | inline bool |
92e059d8 | 2165 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2166 | Target_i386* target, |
ca09d69a | 2167 | Output_section* output_section, |
92e059d8 ILT |
2168 | size_t relnum, |
2169 | const elfcpp::Rel<32, false>& rel, | |
2170 | unsigned int r_type, | |
c06b7b0b | 2171 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2172 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2173 | unsigned char* view, |
2174 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2175 | section_size_type view_size) |
61ba1cf9 | 2176 | { |
ead1e424 ILT |
2177 | if (this->skip_call_tls_get_addr_) |
2178 | { | |
5efc7cd2 CC |
2179 | if ((r_type != elfcpp::R_386_PLT32 |
2180 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2181 | || gsym == NULL |
2182 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2183 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2184 | _("missing expected TLS relocation")); | |
2185 | else | |
ead1e424 | 2186 | { |
75f2446e ILT |
2187 | this->skip_call_tls_get_addr_ = false; |
2188 | return false; | |
ead1e424 | 2189 | } |
ead1e424 ILT |
2190 | } |
2191 | ||
6fa2a40b | 2192 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2193 | |
a3ad94ed | 2194 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2195 | Symbol_value<32> symval; |
436ca963 | 2196 | if (gsym != NULL |
7223e9ca ILT |
2197 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2198 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2199 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2200 | && gsym->can_use_relative_reloc(false) |
2201 | && !gsym->is_from_dynobj() | |
2202 | && !gsym->is_undefined() | |
2203 | && !gsym->is_preemptible()) | |
2204 | { | |
2205 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2206 | // want to use the real value of the symbol, not the PLT offset. | |
2207 | } | |
2208 | else if (gsym != NULL | |
95a2c8d6 | 2209 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2210 | { |
b8e6aad9 ILT |
2211 | symval.set_output_value(target->plt_section()->address() |
2212 | + gsym->plt_offset()); | |
2213 | psymval = &symval; | |
a3ad94ed | 2214 | } |
7223e9ca ILT |
2215 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2216 | { | |
2217 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2218 | if (object->local_has_plt_offset(r_sym)) | |
2219 | { | |
2220 | symval.set_output_value(target->plt_section()->address() | |
2221 | + object->local_plt_offset(r_sym)); | |
2222 | psymval = &symval; | |
2223 | } | |
2224 | } | |
b8e6aad9 | 2225 | |
1b64748b | 2226 | // Get the GOT offset if needed. |
96f2030e ILT |
2227 | // The GOT pointer points to the end of the GOT section. |
2228 | // We need to subtract the size of the GOT section to get | |
2229 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2230 | bool have_got_offset = false; |
2231 | unsigned int got_offset = 0; | |
2232 | switch (r_type) | |
2233 | { | |
2234 | case elfcpp::R_386_GOT32: | |
2235 | if (gsym != NULL) | |
2236 | { | |
0a65a3a7 CC |
2237 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2238 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2239 | - target->got_size()); | |
1b64748b ILT |
2240 | } |
2241 | else | |
2242 | { | |
2243 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2244 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2245 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2246 | - target->got_size()); | |
1b64748b ILT |
2247 | } |
2248 | have_got_offset = true; | |
2249 | break; | |
2250 | ||
2251 | default: | |
2252 | break; | |
2253 | } | |
2254 | ||
61ba1cf9 ILT |
2255 | switch (r_type) |
2256 | { | |
2257 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2258 | case elfcpp::R_386_GNU_VTINHERIT: |
2259 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2260 | break; |
2261 | ||
2262 | case elfcpp::R_386_32: | |
95a2c8d6 | 2263 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2264 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2265 | break; |
2266 | ||
2267 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2268 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2269 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2270 | break; |
2271 | ||
2272 | case elfcpp::R_386_16: | |
95a2c8d6 | 2273 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2274 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2275 | break; |
2276 | ||
2277 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2278 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2279 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2280 | break; |
2281 | ||
92e059d8 | 2282 | case elfcpp::R_386_8: |
95a2c8d6 | 2283 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2284 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2285 | break; |
2286 | ||
2287 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2288 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2289 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2290 | break; |
2291 | ||
ead1e424 | 2292 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2293 | gold_assert(gsym == NULL |
2294 | || gsym->has_plt_offset() | |
99f8faca ILT |
2295 | || gsym->final_value_is_known() |
2296 | || (gsym->is_defined() | |
2297 | && !gsym->is_from_dynobj() | |
2298 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2299 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2300 | break; |
2301 | ||
2302 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2303 | gold_assert(have_got_offset); |
2304 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2305 | break; |
2306 | ||
2307 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2308 | { |
2309 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2310 | value = (psymval->value(object, 0) | |
96f2030e | 2311 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2312 | Relocate_functions<32, false>::rel32(view, value); |
2313 | } | |
ead1e424 ILT |
2314 | break; |
2315 | ||
2316 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2317 | { |
2318 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2319 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2320 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2321 | } | |
ead1e424 ILT |
2322 | break; |
2323 | ||
92e059d8 ILT |
2324 | case elfcpp::R_386_COPY: |
2325 | case elfcpp::R_386_GLOB_DAT: | |
2326 | case elfcpp::R_386_JUMP_SLOT: | |
2327 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2328 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2329 | // These are outstanding tls relocs, which are unexpected when |
2330 | // linking. | |
92e059d8 ILT |
2331 | case elfcpp::R_386_TLS_TPOFF: |
2332 | case elfcpp::R_386_TLS_DTPMOD32: | |
2333 | case elfcpp::R_386_TLS_DTPOFF32: | |
2334 | case elfcpp::R_386_TLS_TPOFF32: | |
2335 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2336 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2337 | _("unexpected reloc %u in object file"), | |
2338 | r_type); | |
92e059d8 ILT |
2339 | break; |
2340 | ||
d61c17ea ILT |
2341 | // These are initial tls relocs, which are expected when |
2342 | // linking. | |
56622147 ILT |
2343 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2344 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2345 | case elfcpp::R_386_TLS_DESC_CALL: | |
2346 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2347 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2348 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2349 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2350 | case elfcpp::R_386_TLS_GOTIE: |
2351 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2352 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2353 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2354 | view, address, view_size); | |
92e059d8 ILT |
2355 | break; |
2356 | ||
92e059d8 ILT |
2357 | case elfcpp::R_386_32PLT: |
2358 | case elfcpp::R_386_TLS_GD_32: | |
2359 | case elfcpp::R_386_TLS_GD_PUSH: | |
2360 | case elfcpp::R_386_TLS_GD_CALL: | |
2361 | case elfcpp::R_386_TLS_GD_POP: | |
2362 | case elfcpp::R_386_TLS_LDM_32: | |
2363 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2364 | case elfcpp::R_386_TLS_LDM_CALL: | |
2365 | case elfcpp::R_386_TLS_LDM_POP: | |
2366 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2367 | default: |
75f2446e ILT |
2368 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2369 | _("unsupported reloc %u"), | |
2370 | r_type); | |
92e059d8 ILT |
2371 | break; |
2372 | } | |
ead1e424 ILT |
2373 | |
2374 | return true; | |
92e059d8 ILT |
2375 | } |
2376 | ||
2377 | // Perform a TLS relocation. | |
2378 | ||
2379 | inline void | |
2380 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2381 | Target_i386* target, |
92e059d8 ILT |
2382 | size_t relnum, |
2383 | const elfcpp::Rel<32, false>& rel, | |
2384 | unsigned int r_type, | |
c06b7b0b | 2385 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2386 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2387 | unsigned char* view, |
2388 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2389 | section_size_type view_size) |
92e059d8 ILT |
2390 | { |
2391 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2392 | |
6fa2a40b | 2393 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2394 | |
2395 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2396 | |
b3705d2a ILT |
2397 | const bool is_final = (gsym == NULL |
2398 | ? !parameters->options().shared() | |
2399 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2400 | const tls::Tls_optimization optimized_type |
2401 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2402 | switch (r_type) |
2403 | { | |
56622147 | 2404 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2405 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2406 | { |
07f397ab | 2407 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2408 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2409 | rel, r_type, value, view, | |
2410 | view_size); | |
92e059d8 ILT |
2411 | break; |
2412 | } | |
07f397ab ILT |
2413 | else |
2414 | { | |
c2b45e22 CC |
2415 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2416 | ? GOT_TYPE_TLS_NOFFSET | |
2417 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2418 | unsigned int got_offset; |
2419 | if (gsym != NULL) | |
2420 | { | |
c2b45e22 CC |
2421 | gold_assert(gsym->has_got_offset(got_type)); |
2422 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2423 | } |
2424 | else | |
2425 | { | |
2426 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2427 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2428 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2429 | - target->got_size()); |
2430 | } | |
2431 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2432 | { | |
2433 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2434 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2435 | got_offset, view, view_size); | |
07f397ab ILT |
2436 | break; |
2437 | } | |
2438 | else if (optimized_type == tls::TLSOPT_NONE) | |
2439 | { | |
2440 | // Relocate the field with the offset of the pair of GOT | |
2441 | // entries. | |
2442 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2443 | break; | |
2444 | } | |
2445 | } | |
75f2446e ILT |
2446 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2447 | _("unsupported reloc %u"), | |
2448 | r_type); | |
92e059d8 ILT |
2449 | break; |
2450 | ||
56622147 ILT |
2451 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2452 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2453 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2454 | if (optimized_type == tls::TLSOPT_TO_LE) |
2455 | { | |
2456 | gold_assert(tls_segment != NULL); | |
2457 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2458 | rel, r_type, value, view, | |
2459 | view_size); | |
2460 | break; | |
2461 | } | |
2462 | else | |
2463 | { | |
2464 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2465 | ? GOT_TYPE_TLS_NOFFSET | |
2466 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2467 | unsigned int got_offset = 0; |
2468 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2469 | && optimized_type == tls::TLSOPT_NONE) | |
2470 | { | |
2471 | // We created GOT entries in the .got.tlsdesc portion of | |
2472 | // the .got.plt section, but the offset stored in the | |
2473 | // symbol is the offset within .got.tlsdesc. | |
2474 | got_offset = (target->got_size() | |
2475 | + target->got_plt_section()->data_size()); | |
2476 | } | |
c2b45e22 CC |
2477 | if (gsym != NULL) |
2478 | { | |
2479 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2480 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2481 | } |
2482 | else | |
2483 | { | |
2484 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2485 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2486 | got_offset += (object->local_got_offset(r_sym, got_type) |
2487 | - target->got_size()); | |
c2b45e22 CC |
2488 | } |
2489 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2490 | { | |
2491 | gold_assert(tls_segment != NULL); | |
2492 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2493 | got_offset, view, view_size); | |
2494 | break; | |
2495 | } | |
2496 | else if (optimized_type == tls::TLSOPT_NONE) | |
2497 | { | |
2498 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2499 | { | |
2500 | // Relocate the field with the offset of the pair of GOT | |
2501 | // entries. | |
2502 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2503 | } | |
2504 | break; | |
2505 | } | |
2506 | } | |
75f2446e ILT |
2507 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2508 | _("unsupported reloc %u"), | |
2509 | r_type); | |
ead1e424 ILT |
2510 | break; |
2511 | ||
56622147 | 2512 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2513 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2514 | { | |
75f2446e ILT |
2515 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2516 | _("both SUN and GNU model " | |
2517 | "TLS relocations")); | |
2518 | break; | |
46cf9fa2 ILT |
2519 | } |
2520 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2521 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2522 | { |
07f397ab | 2523 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2524 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2525 | value, view, view_size); | |
2526 | break; | |
2527 | } | |
07f397ab ILT |
2528 | else if (optimized_type == tls::TLSOPT_NONE) |
2529 | { | |
2530 | // Relocate the field with the offset of the GOT entry for | |
2531 | // the module index. | |
2532 | unsigned int got_offset; | |
94c4710f ILT |
2533 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2534 | - target->got_size()); | |
07f397ab ILT |
2535 | Relocate_functions<32, false>::rel32(view, got_offset); |
2536 | break; | |
2537 | } | |
75f2446e ILT |
2538 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2539 | _("unsupported reloc %u"), | |
2540 | r_type); | |
46cf9fa2 ILT |
2541 | break; |
2542 | ||
56622147 | 2543 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2544 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2545 | { |
82bb573a ILT |
2546 | // This reloc can appear in debugging sections, in which |
2547 | // case we must not convert to local-exec. We decide what | |
2548 | // to do based on whether the section is marked as | |
2549 | // containing executable code. That is what the GNU linker | |
2550 | // does as well. | |
2551 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2552 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2553 | { |
2554 | gold_assert(tls_segment != NULL); | |
2555 | value -= tls_segment->memsz(); | |
2556 | } | |
e8a9fcda | 2557 | } |
46cf9fa2 ILT |
2558 | Relocate_functions<32, false>::rel32(view, value); |
2559 | break; | |
2560 | ||
56622147 ILT |
2561 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2562 | case elfcpp::R_386_TLS_GOTIE: | |
2563 | case elfcpp::R_386_TLS_IE_32: | |
2564 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2565 | { | |
07f397ab | 2566 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2567 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2568 | rel, r_type, value, view, | |
2569 | view_size); | |
2570 | break; | |
2571 | } | |
07f397ab ILT |
2572 | else if (optimized_type == tls::TLSOPT_NONE) |
2573 | { | |
2574 | // Relocate the field with the offset of the GOT entry for | |
2575 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2576 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2577 | ? GOT_TYPE_TLS_OFFSET | |
2578 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2579 | unsigned int got_offset; |
2580 | if (gsym != NULL) | |
2581 | { | |
c2b45e22 CC |
2582 | gold_assert(gsym->has_got_offset(got_type)); |
2583 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2584 | } |
2585 | else | |
2586 | { | |
2587 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2588 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2589 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2590 | } |
2591 | // For the R_386_TLS_IE relocation, we need to apply the | |
2592 | // absolute address of the GOT entry. | |
2593 | if (r_type == elfcpp::R_386_TLS_IE) | |
2594 | got_offset += target->got_plt_section()->address(); | |
2595 | // All GOT offsets are relative to the end of the GOT. | |
2596 | got_offset -= target->got_size(); | |
2597 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2598 | break; | |
2599 | } | |
75f2446e ILT |
2600 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2601 | _("unsupported reloc %u"), | |
2602 | r_type); | |
92e059d8 | 2603 | break; |
92e059d8 | 2604 | |
56622147 | 2605 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2606 | // If we're creating a shared library, a dynamic relocation will |
2607 | // have been created for this location, so do not apply it now. | |
8851ecca | 2608 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2609 | { |
2610 | gold_assert(tls_segment != NULL); | |
2611 | value -= tls_segment->memsz(); | |
2612 | Relocate_functions<32, false>::rel32(view, value); | |
2613 | } | |
56622147 | 2614 | break; |
92e059d8 | 2615 | |
56622147 | 2616 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2617 | // If we're creating a shared library, a dynamic relocation will |
2618 | // have been created for this location, so do not apply it now. | |
8851ecca | 2619 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2620 | { |
2621 | gold_assert(tls_segment != NULL); | |
2622 | value = tls_segment->memsz() - value; | |
2623 | Relocate_functions<32, false>::rel32(view, value); | |
2624 | } | |
56622147 | 2625 | break; |
92e059d8 | 2626 | } |
92e059d8 ILT |
2627 | } |
2628 | ||
e041f13d | 2629 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2630 | // Local-Exec. |
2631 | ||
2632 | inline void | |
2633 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2634 | size_t relnum, | |
2635 | Output_segment* tls_segment, | |
2636 | const elfcpp::Rel<32, false>& rel, | |
2637 | unsigned int, | |
2638 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2639 | unsigned char* view, | |
fe8718a4 | 2640 | section_size_type view_size) |
ead1e424 ILT |
2641 | { |
2642 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2643 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2644 | // leal foo(%reg),%eax; call ___tls_get_addr |
2645 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2646 | ||
af6359d5 ILT |
2647 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2648 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2649 | |
2650 | unsigned char op1 = view[-1]; | |
2651 | unsigned char op2 = view[-2]; | |
2652 | ||
af6359d5 ILT |
2653 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2654 | op2 == 0x8d || op2 == 0x04); | |
2655 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2656 | |
2657 | int roff = 5; | |
2658 | ||
2659 | if (op2 == 0x04) | |
2660 | { | |
af6359d5 ILT |
2661 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2662 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2663 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2664 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2665 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2666 | } | |
2667 | else | |
2668 | { | |
af6359d5 ILT |
2669 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2670 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2671 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2672 | && view[9] == 0x90) |
ead1e424 ILT |
2673 | { |
2674 | // There is a trailing nop. Use the size byte subl. | |
2675 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2676 | roff = 6; | |
2677 | } | |
2678 | else | |
2679 | { | |
2680 | // Use the five byte subl. | |
2681 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2682 | } | |
2683 | } | |
2684 | ||
7bf1f802 | 2685 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2686 | Relocate_functions<32, false>::rel32(view + roff, value); |
2687 | ||
2688 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2689 | // We can skip it. | |
2690 | this->skip_call_tls_get_addr_ = true; | |
2691 | } | |
2692 | ||
7bf1f802 | 2693 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2694 | // Initial-Exec. |
2695 | ||
2696 | inline void | |
2697 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2698 | size_t relnum, | |
c2b45e22 | 2699 | Output_segment*, |
07f397ab ILT |
2700 | const elfcpp::Rel<32, false>& rel, |
2701 | unsigned int, | |
2702 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2703 | unsigned char* view, | |
fe8718a4 | 2704 | section_size_type view_size) |
07f397ab ILT |
2705 | { |
2706 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2707 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2708 | ||
2709 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2710 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2711 | ||
2712 | unsigned char op1 = view[-1]; | |
2713 | unsigned char op2 = view[-2]; | |
2714 | ||
2715 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2716 | op2 == 0x8d || op2 == 0x04); | |
2717 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2718 | ||
2719 | int roff = 5; | |
2720 | ||
c2b45e22 CC |
2721 | // FIXME: For now, support only the first (SIB) form. |
2722 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2723 | |
2724 | if (op2 == 0x04) | |
2725 | { | |
2726 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2727 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2728 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2729 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2730 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2731 | } | |
2732 | else | |
2733 | { | |
2734 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2735 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2736 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2737 | && view[9] == 0x90) |
2738 | { | |
2739 | // FIXME: This is not the right instruction sequence. | |
2740 | // There is a trailing nop. Use the size byte subl. | |
2741 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2742 | roff = 6; | |
2743 | } | |
2744 | else | |
2745 | { | |
2746 | // FIXME: This is not the right instruction sequence. | |
2747 | // Use the five byte subl. | |
2748 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2749 | } | |
2750 | } | |
2751 | ||
07f397ab ILT |
2752 | Relocate_functions<32, false>::rel32(view + roff, value); |
2753 | ||
2754 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2755 | // We can skip it. | |
2756 | this->skip_call_tls_get_addr_ = true; | |
2757 | } | |
2758 | ||
c2b45e22 CC |
2759 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2760 | // General-Dynamic to a Local-Exec. | |
2761 | ||
2762 | inline void | |
2763 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2764 | const Relocate_info<32, false>* relinfo, | |
2765 | size_t relnum, | |
2766 | Output_segment* tls_segment, | |
2767 | const elfcpp::Rel<32, false>& rel, | |
2768 | unsigned int r_type, | |
2769 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2770 | unsigned char* view, | |
2771 | section_size_type view_size) | |
2772 | { | |
2773 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2774 | { | |
2775 | // leal foo@TLSDESC(%ebx), %eax | |
2776 | // ==> leal foo@NTPOFF, %eax | |
2777 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2778 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2779 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2780 | view[-2] == 0x8d && view[-1] == 0x83); | |
2781 | view[-1] = 0x05; | |
2782 | value -= tls_segment->memsz(); | |
2783 | Relocate_functions<32, false>::rel32(view, value); | |
2784 | } | |
2785 | else | |
2786 | { | |
2787 | // call *foo@TLSCALL(%eax) | |
2788 | // ==> nop; nop | |
2789 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2790 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2791 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2792 | view[0] == 0xff && view[1] == 0x10); | |
2793 | view[0] = 0x66; | |
2794 | view[1] = 0x90; | |
2795 | } | |
2796 | } | |
2797 | ||
2798 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2799 | // General-Dynamic to an Initial-Exec. | |
2800 | ||
2801 | inline void | |
2802 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2803 | const Relocate_info<32, false>* relinfo, | |
2804 | size_t relnum, | |
2805 | Output_segment*, | |
2806 | const elfcpp::Rel<32, false>& rel, | |
2807 | unsigned int r_type, | |
2808 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2809 | unsigned char* view, | |
2810 | section_size_type view_size) | |
2811 | { | |
2812 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2813 | { | |
2814 | // leal foo@TLSDESC(%ebx), %eax | |
2815 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2816 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2817 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2818 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2819 | view[-2] == 0x8d && view[-1] == 0x83); | |
2820 | view[-2] = 0x8b; | |
2821 | Relocate_functions<32, false>::rel32(view, value); | |
2822 | } | |
2823 | else | |
2824 | { | |
2825 | // call *foo@TLSCALL(%eax) | |
2826 | // ==> nop; nop | |
2827 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2828 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2829 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2830 | view[0] == 0xff && view[1] == 0x10); | |
2831 | view[0] = 0x66; | |
2832 | view[1] = 0x90; | |
2833 | } | |
2834 | } | |
2835 | ||
46cf9fa2 ILT |
2836 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2837 | // Local-Exec. | |
2838 | ||
2839 | inline void | |
2840 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2841 | size_t relnum, | |
2842 | Output_segment*, | |
2843 | const elfcpp::Rel<32, false>& rel, | |
2844 | unsigned int, | |
2845 | elfcpp::Elf_types<32>::Elf_Addr, | |
2846 | unsigned char* view, | |
fe8718a4 | 2847 | section_size_type view_size) |
46cf9fa2 ILT |
2848 | { |
2849 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2850 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2851 | ||
af6359d5 ILT |
2852 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2853 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2854 | |
2855 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2856 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2857 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2858 | |
af6359d5 | 2859 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2860 | |
2861 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2862 | ||
2863 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2864 | // We can skip it. | |
2865 | this->skip_call_tls_get_addr_ = true; | |
2866 | } | |
2867 | ||
56622147 ILT |
2868 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2869 | // Local-Exec. | |
2870 | ||
2871 | inline void | |
2872 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2873 | size_t relnum, | |
2874 | Output_segment* tls_segment, | |
2875 | const elfcpp::Rel<32, false>& rel, | |
2876 | unsigned int r_type, | |
2877 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2878 | unsigned char* view, | |
fe8718a4 | 2879 | section_size_type view_size) |
56622147 ILT |
2880 | { |
2881 | // We have to actually change the instructions, which means that we | |
2882 | // need to examine the opcodes to figure out which instruction we | |
2883 | // are looking at. | |
2884 | if (r_type == elfcpp::R_386_TLS_IE) | |
2885 | { | |
2886 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2887 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2888 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2889 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2890 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2891 | ||
2892 | unsigned char op1 = view[-1]; | |
2893 | if (op1 == 0xa1) | |
2894 | { | |
2895 | // movl XX,%eax ==> movl $YY,%eax | |
2896 | view[-1] = 0xb8; | |
2897 | } | |
2898 | else | |
2899 | { | |
2900 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2901 | ||
2902 | unsigned char op2 = view[-2]; | |
2903 | if (op2 == 0x8b) | |
2904 | { | |
2905 | // movl XX,%reg ==> movl $YY,%reg | |
2906 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2907 | (op1 & 0xc7) == 0x05); | |
2908 | view[-2] = 0xc7; | |
2909 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2910 | } | |
2911 | else if (op2 == 0x03) | |
2912 | { | |
2913 | // addl XX,%reg ==> addl $YY,%reg | |
2914 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2915 | (op1 & 0xc7) == 0x05); | |
2916 | view[-2] = 0x81; | |
2917 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2918 | } | |
2919 | else | |
2920 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2921 | } | |
2922 | } | |
2923 | else | |
2924 | { | |
2925 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2926 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2927 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2928 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2929 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2930 | ||
2931 | unsigned char op1 = view[-1]; | |
2932 | unsigned char op2 = view[-2]; | |
2933 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2934 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2935 | if (op2 == 0x8b) | |
2936 | { | |
2937 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2938 | view[-2] = 0xc7; | |
2939 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2940 | } | |
2941 | else if (op2 == 0x2b) | |
2942 | { | |
2943 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2944 | view[-2] = 0x81; | |
2945 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2946 | } | |
2947 | else if (op2 == 0x03) | |
2948 | { | |
2949 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2950 | view[-2] = 0x81; | |
2951 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2952 | } | |
2953 | else | |
2954 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2955 | } | |
2956 | ||
7bf1f802 | 2957 | value = tls_segment->memsz() - value; |
56622147 ILT |
2958 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2959 | value = - value; | |
2960 | ||
2961 | Relocate_functions<32, false>::rel32(view, value); | |
2962 | } | |
2963 | ||
61ba1cf9 ILT |
2964 | // Relocate section data. |
2965 | ||
2966 | void | |
92e059d8 | 2967 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2968 | unsigned int sh_type, |
2969 | const unsigned char* prelocs, | |
2970 | size_t reloc_count, | |
730cdc88 ILT |
2971 | Output_section* output_section, |
2972 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2973 | unsigned char* view, |
2974 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2975 | section_size_type view_size, |
2976 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2977 | { |
a3ad94ed | 2978 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2979 | |
ead1e424 ILT |
2980 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2981 | Target_i386::Relocate>( | |
92e059d8 | 2982 | relinfo, |
ead1e424 | 2983 | this, |
61ba1cf9 ILT |
2984 | prelocs, |
2985 | reloc_count, | |
730cdc88 ILT |
2986 | output_section, |
2987 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2988 | view, |
2989 | address, | |
364c7fa5 ILT |
2990 | view_size, |
2991 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2992 | } |
2993 | ||
6a74a719 ILT |
2994 | // Return the size of a relocation while scanning during a relocatable |
2995 | // link. | |
2996 | ||
2997 | unsigned int | |
2998 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2999 | unsigned int r_type, | |
3000 | Relobj* object) | |
3001 | { | |
3002 | switch (r_type) | |
3003 | { | |
3004 | case elfcpp::R_386_NONE: | |
3005 | case elfcpp::R_386_GNU_VTINHERIT: | |
3006 | case elfcpp::R_386_GNU_VTENTRY: | |
3007 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3008 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3009 | case elfcpp::R_386_TLS_DESC_CALL: | |
3010 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3011 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3012 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3013 | case elfcpp::R_386_TLS_IE_32: | |
3014 | case elfcpp::R_386_TLS_GOTIE: | |
3015 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3016 | case elfcpp::R_386_TLS_LE_32: | |
3017 | return 0; | |
3018 | ||
3019 | case elfcpp::R_386_32: | |
3020 | case elfcpp::R_386_PC32: | |
3021 | case elfcpp::R_386_GOT32: | |
3022 | case elfcpp::R_386_PLT32: | |
3023 | case elfcpp::R_386_GOTOFF: | |
3024 | case elfcpp::R_386_GOTPC: | |
3025 | return 4; | |
3026 | ||
3027 | case elfcpp::R_386_16: | |
3028 | case elfcpp::R_386_PC16: | |
3029 | return 2; | |
3030 | ||
3031 | case elfcpp::R_386_8: | |
3032 | case elfcpp::R_386_PC8: | |
3033 | return 1; | |
3034 | ||
3035 | // These are relocations which should only be seen by the | |
3036 | // dynamic linker, and should never be seen here. | |
3037 | case elfcpp::R_386_COPY: | |
3038 | case elfcpp::R_386_GLOB_DAT: | |
3039 | case elfcpp::R_386_JUMP_SLOT: | |
3040 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3041 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3042 | case elfcpp::R_386_TLS_TPOFF: |
3043 | case elfcpp::R_386_TLS_DTPMOD32: | |
3044 | case elfcpp::R_386_TLS_DTPOFF32: | |
3045 | case elfcpp::R_386_TLS_TPOFF32: | |
3046 | case elfcpp::R_386_TLS_DESC: | |
3047 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3048 | return 0; | |
3049 | ||
3050 | case elfcpp::R_386_32PLT: | |
3051 | case elfcpp::R_386_TLS_GD_32: | |
3052 | case elfcpp::R_386_TLS_GD_PUSH: | |
3053 | case elfcpp::R_386_TLS_GD_CALL: | |
3054 | case elfcpp::R_386_TLS_GD_POP: | |
3055 | case elfcpp::R_386_TLS_LDM_32: | |
3056 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3057 | case elfcpp::R_386_TLS_LDM_CALL: | |
3058 | case elfcpp::R_386_TLS_LDM_POP: | |
3059 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3060 | default: | |
3061 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3062 | return 0; | |
3063 | } | |
3064 | } | |
3065 | ||
3066 | // Scan the relocs during a relocatable link. | |
3067 | ||
3068 | void | |
ad0f2072 | 3069 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3070 | Layout* layout, |
6fa2a40b | 3071 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3072 | unsigned int data_shndx, |
3073 | unsigned int sh_type, | |
3074 | const unsigned char* prelocs, | |
3075 | size_t reloc_count, | |
3076 | Output_section* output_section, | |
3077 | bool needs_special_offset_handling, | |
3078 | size_t local_symbol_count, | |
3079 | const unsigned char* plocal_symbols, | |
3080 | Relocatable_relocs* rr) | |
3081 | { | |
3082 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3083 | ||
3084 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3085 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3086 | ||
7019cd25 | 3087 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3088 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3089 | symtab, |
3090 | layout, | |
3091 | object, | |
3092 | data_shndx, | |
3093 | prelocs, | |
3094 | reloc_count, | |
3095 | output_section, | |
3096 | needs_special_offset_handling, | |
3097 | local_symbol_count, | |
3098 | plocal_symbols, | |
3099 | rr); | |
3100 | } | |
3101 | ||
3102 | // Relocate a section during a relocatable link. | |
3103 | ||
3104 | void | |
3105 | Target_i386::relocate_for_relocatable( | |
3106 | const Relocate_info<32, false>* relinfo, | |
3107 | unsigned int sh_type, | |
3108 | const unsigned char* prelocs, | |
3109 | size_t reloc_count, | |
3110 | Output_section* output_section, | |
3111 | off_t offset_in_output_section, | |
3112 | const Relocatable_relocs* rr, | |
3113 | unsigned char* view, | |
3114 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3115 | section_size_type view_size, | |
3116 | unsigned char* reloc_view, | |
3117 | section_size_type reloc_view_size) | |
3118 | { | |
3119 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3120 | ||
7019cd25 | 3121 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3122 | relinfo, |
3123 | prelocs, | |
3124 | reloc_count, | |
3125 | output_section, | |
3126 | offset_in_output_section, | |
3127 | rr, | |
3128 | view, | |
3129 | view_address, | |
3130 | view_size, | |
3131 | reloc_view, | |
3132 | reloc_view_size); | |
3133 | } | |
3134 | ||
ab5c9e90 ILT |
3135 | // Return the value to use for a dynamic which requires special |
3136 | // treatment. This is how we support equality comparisons of function | |
3137 | // pointers across shared library boundaries, as described in the | |
3138 | // processor specific ABI supplement. | |
3139 | ||
3140 | uint64_t | |
3141 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3142 | { | |
3143 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3144 | return this->plt_section()->address() + gsym->plt_offset(); | |
3145 | } | |
3146 | ||
c51e6221 ILT |
3147 | // Return a string used to fill a code section with nops to take up |
3148 | // the specified length. | |
3149 | ||
3150 | std::string | |
8851ecca | 3151 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3152 | { |
3153 | if (length >= 16) | |
3154 | { | |
3155 | // Build a jmp instruction to skip over the bytes. | |
3156 | unsigned char jmp[5]; | |
3157 | jmp[0] = 0xe9; | |
3158 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3159 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3160 | + std::string(length - 5, '\0')); | |
3161 | } | |
3162 | ||
3163 | // Nop sequences of various lengths. | |
3164 | const char nop1[1] = { 0x90 }; // nop | |
3165 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3166 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3167 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3168 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3169 | 0x00 }; // leal 0(%esi,1),%esi | |
3170 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3171 | 0x00, 0x00 }; | |
3172 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3173 | 0x00, 0x00, 0x00 }; | |
3174 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3175 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3176 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3177 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3178 | 0x00 }; | |
3179 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3180 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3181 | 0x00, 0x00 }; | |
3182 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3183 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3184 | 0x00, 0x00, 0x00 }; | |
3185 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3186 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3187 | 0x00, 0x00, 0x00, 0x00 }; | |
3188 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3189 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3190 | 0x27, 0x00, 0x00, 0x00, | |
3191 | 0x00 }; | |
3192 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3193 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3194 | 0xbc, 0x27, 0x00, 0x00, | |
3195 | 0x00, 0x00 }; | |
3196 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3197 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3198 | 0x90, 0x90, 0x90, 0x90, | |
3199 | 0x90, 0x90, 0x90 }; | |
3200 | ||
3201 | const char* nops[16] = { | |
3202 | NULL, | |
3203 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3204 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3205 | }; | |
3206 | ||
3207 | return std::string(nops[length], length); | |
3208 | } | |
3209 | ||
b6848d3c ILT |
3210 | // Return whether SYM should be treated as a call to a non-split |
3211 | // function. We don't want that to be true of a call to a | |
3212 | // get_pc_thunk function. | |
3213 | ||
3214 | bool | |
3215 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3216 | { | |
3217 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3218 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3219 | } | |
3220 | ||
364c7fa5 | 3221 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3222 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3223 | // code. We have to change the function so that it always ensures |
3224 | // that it has enough stack space to run some random function. | |
3225 | ||
3226 | void | |
3227 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3228 | section_offset_type fnoffset, | |
3229 | section_size_type fnsize, | |
3230 | unsigned char* view, | |
3231 | section_size_type view_size, | |
3232 | std::string* from, | |
3233 | std::string* to) const | |
3234 | { | |
3235 | // The function starts with a comparison of the stack pointer and a | |
3236 | // field in the TCB. This is followed by a jump. | |
3237 | ||
3238 | // cmp %gs:NN,%esp | |
3239 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3240 | && fnsize > 7) | |
3241 | { | |
3242 | // We will call __morestack if the carry flag is set after this | |
3243 | // comparison. We turn the comparison into an stc instruction | |
3244 | // and some nops. | |
3245 | view[fnoffset] = '\xf9'; | |
3246 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3247 | } | |
3248 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3249 | // lea NN(%esp),%edx |
3250 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3251 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3252 | && fnsize > 7) |
3253 | { | |
3254 | // This is loading an offset from the stack pointer for a | |
3255 | // comparison. The offset is negative, so we decrease the | |
3256 | // offset by the amount of space we need for the stack. This | |
3257 | // means we will avoid calling __morestack if there happens to | |
3258 | // be plenty of space on the stack already. | |
3259 | unsigned char* pval = view + fnoffset + 3; | |
3260 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3261 | val -= parameters->options().split_stack_adjust_size(); | |
3262 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3263 | } | |
3264 | else | |
3265 | { | |
3266 | if (!object->has_no_split_stack()) | |
3267 | object->error(_("failed to match split-stack sequence at " | |
3268 | "section %u offset %0zx"), | |
ac33a407 | 3269 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3270 | return; |
3271 | } | |
3272 | ||
3273 | // We have to change the function so that it calls | |
3274 | // __morestack_non_split instead of __morestack. The former will | |
3275 | // allocate additional stack space. | |
3276 | *from = "__morestack"; | |
3277 | *to = "__morestack_non_split"; | |
3278 | } | |
3279 | ||
14bfc3f5 ILT |
3280 | // The selector for i386 object files. |
3281 | ||
36959681 | 3282 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3283 | { |
3284 | public: | |
3285 | Target_selector_i386() | |
36959681 ILT |
3286 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
3287 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
3288 | { } |
3289 | ||
3290 | Target* | |
e96caa79 ILT |
3291 | do_instantiate_target() |
3292 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3293 | }; |
3294 | ||
14bfc3f5 ILT |
3295 | Target_selector_i386 target_selector_i386; |
3296 | ||
3297 | } // End anonymous namespace. |