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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
a8df5856 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
14bfc3f5 | 23 | #include "gold.h" |
ead1e424 ILT |
24 | |
25 | #include <cstring> | |
26 | ||
14bfc3f5 | 27 | #include "elfcpp.h" |
7e1edb90 | 28 | #include "parameters.h" |
92e059d8 | 29 | #include "reloc.h" |
61ba1cf9 ILT |
30 | #include "i386.h" |
31 | #include "object.h" | |
ead1e424 | 32 | #include "symtab.h" |
92e059d8 ILT |
33 | #include "layout.h" |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
14bfc3f5 | 36 | #include "target.h" |
61ba1cf9 | 37 | #include "target-reloc.h" |
14bfc3f5 | 38 | #include "target-select.h" |
af6359d5 | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
14bfc3f5 ILT |
42 | |
43 | namespace | |
44 | { | |
45 | ||
46 | using namespace gold; | |
47 | ||
7223e9ca ILT |
48 | // A class to handle the PLT data. |
49 | ||
50 | class Output_data_plt_i386 : public Output_section_data | |
51 | { | |
52 | public: | |
53 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
54 | ||
55 | Output_data_plt_i386(Symbol_table*, Layout*, Output_data_space*); | |
56 | ||
57 | // Add an entry to the PLT. | |
58 | void | |
59 | add_entry(Symbol* gsym); | |
60 | ||
61 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
62 | unsigned int | |
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 | |
0897ed3b ST |
174 | inline bool |
175 | can_check_for_function_pointers() const | |
176 | { return true; } | |
177 | ||
c95e9f27 ST |
178 | virtual bool |
179 | can_icf_inline_merge_sections () const | |
180 | { return true; } | |
181 | ||
6d03d481 ST |
182 | // Process the relocations to determine unreferenced sections for |
183 | // garbage collection. | |
184 | void | |
ad0f2072 | 185 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 186 | Layout* layout, |
6fa2a40b | 187 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
188 | unsigned int data_shndx, |
189 | unsigned int sh_type, | |
190 | const unsigned char* prelocs, | |
191 | size_t reloc_count, | |
192 | Output_section* output_section, | |
193 | bool needs_special_offset_handling, | |
194 | size_t local_symbol_count, | |
195 | const unsigned char* plocal_symbols); | |
196 | ||
92e059d8 | 197 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 198 | void |
ad0f2072 | 199 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 200 | Layout* layout, |
6fa2a40b | 201 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 202 | unsigned int data_shndx, |
92e059d8 ILT |
203 | unsigned int sh_type, |
204 | const unsigned char* prelocs, | |
205 | size_t reloc_count, | |
730cdc88 ILT |
206 | Output_section* output_section, |
207 | bool needs_special_offset_handling, | |
92e059d8 | 208 | size_t local_symbol_count, |
730cdc88 | 209 | const unsigned char* plocal_symbols); |
61ba1cf9 | 210 | |
5a6f7e2d ILT |
211 | // Finalize the sections. |
212 | void | |
f59f41f3 | 213 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 214 | |
ab5c9e90 ILT |
215 | // Return the value to use for a dynamic which requires special |
216 | // treatment. | |
217 | uint64_t | |
218 | do_dynsym_value(const Symbol*) const; | |
219 | ||
92e059d8 ILT |
220 | // Relocate a section. |
221 | void | |
222 | relocate_section(const Relocate_info<32, false>*, | |
223 | unsigned int sh_type, | |
224 | const unsigned char* prelocs, | |
225 | size_t reloc_count, | |
730cdc88 ILT |
226 | Output_section* output_section, |
227 | bool needs_special_offset_handling, | |
92e059d8 ILT |
228 | unsigned char* view, |
229 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
230 | section_size_type view_size, |
231 | const Reloc_symbol_changes*); | |
92e059d8 | 232 | |
6a74a719 ILT |
233 | // Scan the relocs during a relocatable link. |
234 | void | |
ad0f2072 | 235 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 236 | Layout* layout, |
6fa2a40b | 237 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
238 | unsigned int data_shndx, |
239 | unsigned int sh_type, | |
240 | const unsigned char* prelocs, | |
241 | size_t reloc_count, | |
242 | Output_section* output_section, | |
243 | bool needs_special_offset_handling, | |
244 | size_t local_symbol_count, | |
245 | const unsigned char* plocal_symbols, | |
246 | Relocatable_relocs*); | |
247 | ||
248 | // Relocate a section during a relocatable link. | |
249 | void | |
250 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
251 | unsigned int sh_type, | |
252 | const unsigned char* prelocs, | |
253 | size_t reloc_count, | |
254 | Output_section* output_section, | |
255 | off_t offset_in_output_section, | |
256 | const Relocatable_relocs*, | |
257 | unsigned char* view, | |
258 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
259 | section_size_type view_size, | |
260 | unsigned char* reloc_view, | |
261 | section_size_type reloc_view_size); | |
262 | ||
c51e6221 ILT |
263 | // Return a string used to fill a code section with nops. |
264 | std::string | |
8851ecca | 265 | do_code_fill(section_size_type length) const; |
c51e6221 | 266 | |
9a2d6984 ILT |
267 | // Return whether SYM is defined by the ABI. |
268 | bool | |
9c2d0ef9 | 269 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
270 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
271 | ||
bb04269c DK |
272 | // Return whether a symbol name implies a local label. The UnixWare |
273 | // 2.1 cc generates temporary symbols that start with .X, so we | |
274 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
275 | // If so, we should move the .X recognition into | |
276 | // Target::do_is_local_label_name. | |
277 | bool | |
278 | do_is_local_label_name(const char* name) const | |
279 | { | |
280 | if (name[0] == '.' && name[1] == 'X') | |
281 | return true; | |
282 | return Target::do_is_local_label_name(name); | |
283 | } | |
284 | ||
7223e9ca ILT |
285 | // Return the PLT section. |
286 | Output_data* | |
287 | do_plt_section_for_global(const Symbol*) const | |
288 | { return this->plt_section(); } | |
289 | ||
290 | Output_data* | |
291 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
292 | { return this->plt_section(); } | |
293 | ||
b6848d3c ILT |
294 | // Return whether SYM is call to a non-split function. |
295 | bool | |
296 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
297 | ||
9b547ce6 | 298 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
299 | void |
300 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
301 | section_offset_type fnoffset, section_size_type fnsize, | |
302 | unsigned char* view, section_size_type view_size, | |
303 | std::string* from, std::string* to) const; | |
304 | ||
96f2030e | 305 | // Return the size of the GOT section. |
fe8718a4 | 306 | section_size_type |
0e70b911 | 307 | got_size() const |
96f2030e ILT |
308 | { |
309 | gold_assert(this->got_ != NULL); | |
310 | return this->got_->data_size(); | |
311 | } | |
312 | ||
0e70b911 CC |
313 | // Return the number of entries in the GOT. |
314 | unsigned int | |
315 | got_entry_count() const | |
316 | { | |
317 | if (this->got_ == NULL) | |
318 | return 0; | |
319 | return this->got_size() / 4; | |
320 | } | |
321 | ||
322 | // Return the number of entries in the PLT. | |
323 | unsigned int | |
324 | plt_entry_count() const; | |
325 | ||
326 | // Return the offset of the first non-reserved PLT entry. | |
327 | unsigned int | |
328 | first_plt_entry_offset() const; | |
329 | ||
330 | // Return the size of each PLT entry. | |
331 | unsigned int | |
332 | plt_entry_size() const; | |
333 | ||
92e059d8 ILT |
334 | private: |
335 | // The class which scans relocations. | |
336 | struct Scan | |
61ba1cf9 | 337 | { |
95a2c8d6 RS |
338 | static inline int |
339 | ||
340 | get_reference_flags(unsigned int r_type); | |
341 | ||
61ba1cf9 | 342 | inline void |
ad0f2072 | 343 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 344 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 345 | unsigned int data_shndx, |
07f397ab | 346 | Output_section* output_section, |
92e059d8 ILT |
347 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
348 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 349 | |
92e059d8 | 350 | inline void |
ad0f2072 | 351 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 352 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 353 | unsigned int data_shndx, |
07f397ab | 354 | Output_section* output_section, |
92e059d8 ILT |
355 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
356 | Symbol* gsym); | |
af6359d5 | 357 | |
21bb3914 | 358 | inline bool |
0897ed3b ST |
359 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
360 | Target_i386* target, | |
6fa2a40b | 361 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
362 | unsigned int data_shndx, |
363 | Output_section* output_section, | |
364 | const elfcpp::Rel<32, false>& reloc, | |
365 | unsigned int r_type, | |
366 | const elfcpp::Sym<32, false>& lsym); | |
367 | ||
368 | inline bool | |
369 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
370 | Target_i386* target, | |
6fa2a40b | 371 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
372 | unsigned int data_shndx, |
373 | Output_section* output_section, | |
374 | const elfcpp::Rel<32, false>& reloc, | |
375 | unsigned int r_type, | |
376 | Symbol* gsym); | |
21bb3914 ST |
377 | |
378 | inline bool | |
0897ed3b | 379 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 380 | |
7223e9ca | 381 | bool |
6fa2a40b CC |
382 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
383 | unsigned int r_type); | |
7223e9ca | 384 | |
af6359d5 | 385 | static void |
6fa2a40b | 386 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
387 | |
388 | static void | |
6fa2a40b | 389 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 390 | Symbol*); |
61ba1cf9 ILT |
391 | }; |
392 | ||
92e059d8 ILT |
393 | // The class which implements relocation. |
394 | class Relocate | |
395 | { | |
396 | public: | |
ead1e424 | 397 | Relocate() |
46cf9fa2 | 398 | : skip_call_tls_get_addr_(false), |
82bb573a | 399 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
400 | { } |
401 | ||
402 | ~Relocate() | |
403 | { | |
404 | if (this->skip_call_tls_get_addr_) | |
405 | { | |
406 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 407 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
408 | } |
409 | } | |
410 | ||
86849f1f ILT |
411 | // Return whether the static relocation needs to be applied. |
412 | inline bool | |
413 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 414 | unsigned int r_type, |
031cdbed ILT |
415 | bool is_32bit, |
416 | Output_section* output_section); | |
86849f1f | 417 | |
ead1e424 ILT |
418 | // Do a relocation. Return false if the caller should not issue |
419 | // any warnings about this relocation. | |
420 | inline bool | |
031cdbed ILT |
421 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
422 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 423 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 424 | const Symbol_value<32>*, |
92e059d8 | 425 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 426 | section_size_type); |
92e059d8 ILT |
427 | |
428 | private: | |
429 | // Do a TLS relocation. | |
ead1e424 | 430 | inline void |
07f397ab ILT |
431 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
432 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 433 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 434 | const Symbol_value<32>*, |
fe8718a4 ILT |
435 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
436 | section_size_type); | |
92e059d8 | 437 | |
07f397ab ILT |
438 | // Do a TLS General-Dynamic to Initial-Exec transition. |
439 | inline void | |
440 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
441 | Output_segment* tls_segment, | |
442 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
443 | elfcpp::Elf_types<32>::Elf_Addr value, | |
444 | unsigned char* view, | |
fe8718a4 | 445 | section_size_type view_size); |
07f397ab | 446 | |
56622147 ILT |
447 | // Do a TLS General-Dynamic to Local-Exec transition. |
448 | inline void | |
449 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
450 | Output_segment* tls_segment, |
451 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
452 | elfcpp::Elf_types<32>::Elf_Addr value, | |
453 | unsigned char* view, | |
fe8718a4 | 454 | section_size_type view_size); |
92e059d8 | 455 | |
c2b45e22 CC |
456 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
457 | // transition. | |
458 | inline void | |
459 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
460 | Output_segment* tls_segment, | |
461 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
462 | elfcpp::Elf_types<32>::Elf_Addr value, | |
463 | unsigned char* view, | |
464 | section_size_type view_size); | |
465 | ||
466 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
467 | // transition. | |
468 | inline void | |
469 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
470 | Output_segment* tls_segment, | |
471 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
472 | elfcpp::Elf_types<32>::Elf_Addr value, | |
473 | unsigned char* view, | |
474 | section_size_type view_size); | |
475 | ||
56622147 | 476 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 477 | inline void |
56622147 | 478 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
479 | Output_segment* tls_segment, |
480 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
481 | elfcpp::Elf_types<32>::Elf_Addr value, | |
482 | unsigned char* view, | |
fe8718a4 | 483 | section_size_type view_size); |
ead1e424 | 484 | |
56622147 ILT |
485 | // Do a TLS Initial-Exec to Local-Exec transition. |
486 | static inline void | |
487 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
488 | Output_segment* tls_segment, |
489 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
490 | elfcpp::Elf_types<32>::Elf_Addr value, | |
491 | unsigned char* view, | |
fe8718a4 | 492 | section_size_type view_size); |
46cf9fa2 | 493 | |
46cf9fa2 ILT |
494 | // We need to keep track of which type of local dynamic relocation |
495 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
496 | enum Local_dynamic_type | |
497 | { | |
498 | LOCAL_DYNAMIC_NONE, | |
499 | LOCAL_DYNAMIC_SUN, | |
500 | LOCAL_DYNAMIC_GNU | |
501 | }; | |
502 | ||
ead1e424 ILT |
503 | // This is set if we should skip the next reloc, which should be a |
504 | // PLT32 reloc against ___tls_get_addr. | |
505 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
506 | // The type of local dynamic relocation we have seen in the section |
507 | // being relocated, if any. | |
508 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
509 | }; |
510 | ||
6a74a719 ILT |
511 | // A class which returns the size required for a relocation type, |
512 | // used while scanning relocs during a relocatable link. | |
513 | class Relocatable_size_for_reloc | |
514 | { | |
515 | public: | |
516 | unsigned int | |
517 | get_size_for_reloc(unsigned int, Relobj*); | |
518 | }; | |
519 | ||
92e059d8 ILT |
520 | // Adjust TLS relocation type based on the options and whether this |
521 | // is a local symbol. | |
af6359d5 | 522 | static tls::Tls_optimization |
7e1edb90 | 523 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 524 | |
ead1e424 | 525 | // Get the GOT section, creating it if necessary. |
dbe717ef | 526 | Output_data_got<32, false>* |
7e1edb90 | 527 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 528 | |
96f2030e ILT |
529 | // Get the GOT PLT section. |
530 | Output_data_space* | |
531 | got_plt_section() const | |
532 | { | |
533 | gold_assert(this->got_plt_ != NULL); | |
534 | return this->got_plt_; | |
535 | } | |
536 | ||
a8df5856 ILT |
537 | // Get the GOT section for TLSDESC entries. |
538 | Output_data_got<32, false>* | |
539 | got_tlsdesc_section() const | |
540 | { | |
541 | gold_assert(this->got_tlsdesc_ != NULL); | |
542 | return this->got_tlsdesc_; | |
543 | } | |
544 | ||
7223e9ca ILT |
545 | // Create the PLT section. |
546 | void | |
547 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
548 | ||
a3ad94ed ILT |
549 | // Create a PLT entry for a global symbol. |
550 | void | |
7e1edb90 | 551 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 552 | |
7223e9ca ILT |
553 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
554 | void | |
555 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 556 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
557 | unsigned int local_sym_index); |
558 | ||
9fa33bee | 559 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
560 | void |
561 | define_tls_base_symbol(Symbol_table*, Layout*); | |
562 | ||
94c4710f ILT |
563 | // Create a GOT entry for the TLS module index. |
564 | unsigned int | |
565 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 566 | Sized_relobj_file<32, false>* object); |
94c4710f | 567 | |
a3ad94ed | 568 | // Get the PLT section. |
e291e7b9 | 569 | Output_data_plt_i386* |
a3ad94ed ILT |
570 | plt_section() const |
571 | { | |
572 | gold_assert(this->plt_ != NULL); | |
573 | return this->plt_; | |
574 | } | |
575 | ||
5a6f7e2d ILT |
576 | // Get the dynamic reloc section, creating it if necessary. |
577 | Reloc_section* | |
578 | rel_dyn_section(Layout*); | |
579 | ||
e291e7b9 ILT |
580 | // Get the section to use for TLS_DESC relocations. |
581 | Reloc_section* | |
582 | rel_tls_desc_section(Layout*) const; | |
583 | ||
12c0daef | 584 | // Add a potential copy relocation. |
a3ad94ed | 585 | void |
ef9beddf | 586 | copy_reloc(Symbol_table* symtab, Layout* layout, |
6fa2a40b | 587 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
588 | unsigned int shndx, Output_section* output_section, |
589 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
590 | { | |
591 | this->copy_relocs_.copy_reloc(symtab, layout, | |
592 | symtab->get_sized_symbol<32>(sym), | |
593 | object, shndx, output_section, reloc, | |
594 | this->rel_dyn_section(layout)); | |
595 | } | |
ead1e424 | 596 | |
92e059d8 ILT |
597 | // Information about this specific target which we pass to the |
598 | // general Target structure. | |
75f65a3e | 599 | static const Target::Target_info i386_info; |
ead1e424 | 600 | |
0a65a3a7 | 601 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
602 | // These values are exposed to the ABI in an incremental link. |
603 | // Do not renumber existing values without changing the version | |
604 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
605 | enum Got_type |
606 | { | |
607 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
608 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
609 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
610 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
611 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
612 | }; |
613 | ||
ead1e424 | 614 | // The GOT section. |
dbe717ef | 615 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
616 | // The PLT section. |
617 | Output_data_plt_i386* plt_; | |
618 | // The GOT PLT section. | |
619 | Output_data_space* got_plt_; | |
a8df5856 ILT |
620 | // The GOT section for TLSDESC relocations. |
621 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
622 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
623 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
624 | // The dynamic reloc section. |
625 | Reloc_section* rel_dyn_; | |
626 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 627 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
628 | // Space for variables copied with a COPY reloc. |
629 | Output_data_space* dynbss_; | |
c2b45e22 | 630 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 631 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
632 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
633 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
634 | }; |
635 | ||
636 | const Target::Target_info Target_i386::i386_info = | |
637 | { | |
61ba1cf9 ILT |
638 | 32, // size |
639 | false, // is_big_endian | |
640 | elfcpp::EM_386, // machine_code | |
641 | false, // has_make_symbol | |
dbe717ef | 642 | false, // has_resolve |
c51e6221 | 643 | true, // has_code_fill |
35cdfc9a | 644 | true, // is_default_stack_executable |
0864d551 | 645 | '\0', // wrap_char |
dbe717ef | 646 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 647 | 0x08048000, // default_text_segment_address |
cd72c291 | 648 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
649 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
650 | elfcpp::SHN_UNDEF, // small_common_shndx | |
651 | elfcpp::SHN_UNDEF, // large_common_shndx | |
652 | 0, // small_common_section_flags | |
05a352e6 DK |
653 | 0, // large_common_section_flags |
654 | NULL, // attributes_section | |
655 | NULL // attributes_vendor | |
14bfc3f5 ILT |
656 | }; |
657 | ||
ead1e424 ILT |
658 | // Get the GOT section, creating it if necessary. |
659 | ||
dbe717ef | 660 | Output_data_got<32, false>* |
7e1edb90 | 661 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
662 | { |
663 | if (this->got_ == NULL) | |
664 | { | |
7e1edb90 | 665 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 666 | |
7e1edb90 | 667 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 668 | |
82742395 ILT |
669 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
670 | (elfcpp::SHF_ALLOC | |
671 | | elfcpp::SHF_WRITE), | |
22f0da72 | 672 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 673 | |
7d9e3d98 | 674 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
675 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
676 | (elfcpp::SHF_ALLOC | |
677 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
678 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
679 | false); | |
a3ad94ed | 680 | |
ead1e424 | 681 | // The first three entries are reserved. |
27bc2bce | 682 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 683 | |
1a2dff53 ILT |
684 | // Those bytes can go into the relro segment. |
685 | layout->increase_relro(3 * 4); | |
686 | ||
a3ad94ed | 687 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
688 | this->global_offset_table_ = |
689 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
690 | Symbol_table::PREDEFINED, | |
691 | this->got_plt_, | |
692 | 0, 0, elfcpp::STT_OBJECT, | |
693 | elfcpp::STB_LOCAL, | |
694 | elfcpp::STV_HIDDEN, 0, | |
695 | false, false); | |
a8df5856 ILT |
696 | |
697 | // If there are any TLSDESC relocations, they get GOT entries in | |
698 | // .got.plt after the jump slot entries. | |
699 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
700 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
701 | (elfcpp::SHF_ALLOC | |
702 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
703 | this->got_tlsdesc_, |
704 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 705 | } |
a3ad94ed | 706 | |
ead1e424 ILT |
707 | return this->got_; |
708 | } | |
709 | ||
5a6f7e2d ILT |
710 | // Get the dynamic reloc section, creating it if necessary. |
711 | ||
712 | Target_i386::Reloc_section* | |
713 | Target_i386::rel_dyn_section(Layout* layout) | |
714 | { | |
715 | if (this->rel_dyn_ == NULL) | |
716 | { | |
717 | gold_assert(layout != NULL); | |
d98bc257 | 718 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 719 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
720 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
721 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
722 | } |
723 | return this->rel_dyn_; | |
724 | } | |
725 | ||
a3ad94ed ILT |
726 | // Create the PLT section. The ordinary .got section is an argument, |
727 | // since we need to refer to the start. We also create our own .got | |
728 | // section just for PLT entries. | |
729 | ||
7223e9ca ILT |
730 | Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab, |
731 | Layout* layout, | |
7e1edb90 | 732 | Output_data_space* got_plt) |
7223e9ca ILT |
733 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0), |
734 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 735 | { |
d98bc257 | 736 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 737 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
738 | elfcpp::SHF_ALLOC, this->rel_, |
739 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
740 | |
741 | if (parameters->doing_static_link()) | |
742 | { | |
743 | // A statically linked executable will only have a .rel.plt | |
744 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
745 | // symbols. The library will use these symbols to locate the | |
746 | // IRELATIVE relocs at program startup time. | |
747 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
748 | Symbol_table::PREDEFINED, | |
749 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
750 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
751 | 0, false, true); | |
752 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
753 | Symbol_table::PREDEFINED, | |
754 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
755 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
756 | 0, true, true); | |
757 | } | |
a3ad94ed ILT |
758 | } |
759 | ||
16649710 ILT |
760 | void |
761 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
762 | { | |
763 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
764 | // linker, and so do we. | |
765 | os->set_entsize(4); | |
766 | } | |
767 | ||
a3ad94ed ILT |
768 | // Add an entry to the PLT. |
769 | ||
770 | void | |
771 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
772 | { | |
773 | gold_assert(!gsym->has_plt_offset()); | |
774 | ||
775 | // Note that when setting the PLT offset we skip the initial | |
776 | // reserved PLT entry. | |
777 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
778 | ||
779 | ++this->count_; | |
780 | ||
fe8718a4 | 781 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
782 | |
783 | // Every PLT entry needs a GOT entry which points back to the PLT | |
784 | // entry (this will be changed by the dynamic linker, normally | |
785 | // lazily when the function is called). | |
27bc2bce | 786 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
787 | |
788 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
789 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
790 | && gsym->can_use_relative_reloc(false)) | |
791 | { | |
792 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
793 | this->got_plt_, got_offset); | |
794 | struct Global_ifunc gi; | |
795 | gi.sym = gsym; | |
796 | gi.got_offset = got_offset; | |
797 | this->global_ifuncs_.push_back(gi); | |
798 | } | |
799 | else | |
800 | { | |
801 | gsym->set_needs_dynsym_entry(); | |
802 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
803 | got_offset); | |
804 | } | |
a3ad94ed ILT |
805 | |
806 | // Note that we don't need to save the symbol. The contents of the | |
807 | // PLT are independent of which symbols are used. The symbols only | |
808 | // appear in the relocations. | |
809 | } | |
810 | ||
7223e9ca ILT |
811 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
812 | // the PLT offset. | |
813 | ||
814 | unsigned int | |
6fa2a40b CC |
815 | Output_data_plt_i386::add_local_ifunc_entry( |
816 | Sized_relobj_file<32, false>* relobj, | |
817 | unsigned int local_sym_index) | |
7223e9ca ILT |
818 | { |
819 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
820 | ++this->count_; | |
821 | ||
822 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
823 | ||
824 | // Every PLT entry needs a GOT entry which points back to the PLT | |
825 | // entry. | |
826 | this->got_plt_->set_current_data_size(got_offset + 4); | |
827 | ||
828 | // Every PLT entry needs a reloc. | |
829 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
830 | elfcpp::R_386_IRELATIVE, | |
831 | this->got_plt_, got_offset); | |
832 | ||
833 | struct Local_ifunc li; | |
834 | li.object = relobj; | |
835 | li.local_sym_index = local_sym_index; | |
836 | li.got_offset = got_offset; | |
837 | this->local_ifuncs_.push_back(li); | |
838 | ||
839 | return plt_offset; | |
840 | } | |
841 | ||
e291e7b9 ILT |
842 | // Return where the TLS_DESC relocations should go, creating it if |
843 | // necessary. These follow the JUMP_SLOT relocations. | |
844 | ||
845 | Output_data_plt_i386::Reloc_section* | |
846 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
847 | { | |
848 | if (this->tls_desc_rel_ == NULL) | |
849 | { | |
850 | this->tls_desc_rel_ = new Reloc_section(false); | |
851 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
852 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 853 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
854 | gold_assert(this->tls_desc_rel_->output_section() == |
855 | this->rel_->output_section()); | |
856 | } | |
857 | return this->tls_desc_rel_; | |
858 | } | |
859 | ||
a3ad94ed ILT |
860 | // The first entry in the PLT for an executable. |
861 | ||
862 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
863 | { | |
864 | 0xff, 0x35, // pushl contents of memory address | |
865 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
866 | 0xff, 0x25, // jmp indirect | |
867 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
868 | 0, 0, 0, 0 // unused | |
869 | }; | |
870 | ||
871 | // The first entry in the PLT for a shared object. | |
872 | ||
873 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
874 | { | |
875 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
876 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
877 | 0, 0, 0, 0 // unused | |
878 | }; | |
879 | ||
880 | // Subsequent entries in the PLT for an executable. | |
881 | ||
882 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
883 | { | |
884 | 0xff, 0x25, // jmp indirect | |
885 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
886 | 0x68, // pushl immediate | |
887 | 0, 0, 0, 0, // replaced with offset into relocation table | |
888 | 0xe9, // jmp relative | |
889 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
890 | }; | |
891 | ||
892 | // Subsequent entries in the PLT for a shared object. | |
893 | ||
894 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
895 | { | |
896 | 0xff, 0xa3, // jmp *offset(%ebx) | |
897 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
898 | 0x68, // pushl immediate | |
899 | 0, 0, 0, 0, // replaced with offset into relocation table | |
900 | 0xe9, // jmp relative | |
901 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
902 | }; | |
903 | ||
904 | // Write out the PLT. This uses the hand-coded instructions above, | |
905 | // and adjusts them as needed. This is all specified by the i386 ELF | |
906 | // Processor Supplement. | |
907 | ||
908 | void | |
909 | Output_data_plt_i386::do_write(Output_file* of) | |
910 | { | |
2ea97941 | 911 | const off_t offset = this->offset(); |
fe8718a4 ILT |
912 | const section_size_type oview_size = |
913 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 914 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
915 | |
916 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
917 | const section_size_type got_size = |
918 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
919 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
920 | got_size); | |
921 | ||
922 | unsigned char* pov = oview; | |
923 | ||
924 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
925 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
926 | ||
374ad285 | 927 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
928 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
929 | else | |
930 | { | |
931 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
932 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
933 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
934 | } | |
935 | pov += plt_entry_size; | |
936 | ||
937 | unsigned char* got_pov = got_view; | |
938 | ||
939 | memset(got_pov, 0, 12); | |
940 | got_pov += 12; | |
941 | ||
942 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
943 | ||
944 | unsigned int plt_offset = plt_entry_size; | |
945 | unsigned int plt_rel_offset = 0; | |
946 | unsigned int got_offset = 12; | |
947 | const unsigned int count = this->count_; | |
948 | for (unsigned int i = 0; | |
949 | i < count; | |
950 | ++i, | |
951 | pov += plt_entry_size, | |
952 | got_pov += 4, | |
953 | plt_offset += plt_entry_size, | |
954 | plt_rel_offset += rel_size, | |
955 | got_offset += 4) | |
956 | { | |
957 | // Set and adjust the PLT entry itself. | |
958 | ||
374ad285 | 959 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
960 | { |
961 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
962 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
963 | } | |
964 | else | |
965 | { | |
966 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
967 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
968 | (got_address | |
969 | + got_offset)); | |
970 | } | |
971 | ||
972 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
973 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
974 | - (plt_offset + plt_entry_size)); | |
975 | ||
976 | // Set the entry in the GOT. | |
977 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
978 | } | |
979 | ||
7223e9ca ILT |
980 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
981 | // the GOT to point to the actual symbol value, rather than point to | |
982 | // the PLT entry. That will let the dynamic linker call the right | |
983 | // function when resolving IRELATIVE relocations. | |
984 | for (std::vector<Global_ifunc>::const_iterator p = | |
985 | this->global_ifuncs_.begin(); | |
986 | p != this->global_ifuncs_.end(); | |
987 | ++p) | |
988 | { | |
989 | const Sized_symbol<32>* ssym = | |
990 | static_cast<const Sized_symbol<32>*>(p->sym); | |
991 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
992 | ssym->value()); | |
993 | } | |
994 | ||
995 | for (std::vector<Local_ifunc>::const_iterator p = | |
996 | this->local_ifuncs_.begin(); | |
997 | p != this->local_ifuncs_.end(); | |
998 | ++p) | |
999 | { | |
1000 | const Symbol_value<32>* psymval = | |
1001 | p->object->local_symbol(p->local_sym_index); | |
1002 | elfcpp::Swap<32, false>::writeval(got_view + p->got_offset, | |
1003 | psymval->value(p->object, 0)); | |
1004 | } | |
1005 | ||
fe8718a4 ILT |
1006 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1007 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1008 | |
2ea97941 | 1009 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1010 | of->write_output_view(got_file_offset, got_size, got_view); |
1011 | } | |
1012 | ||
7223e9ca | 1013 | // Create the PLT section. |
a3ad94ed ILT |
1014 | |
1015 | void | |
7223e9ca | 1016 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1017 | { |
a3ad94ed ILT |
1018 | if (this->plt_ == NULL) |
1019 | { | |
1020 | // Create the GOT sections first. | |
7e1edb90 | 1021 | this->got_section(symtab, layout); |
a3ad94ed | 1022 | |
7223e9ca | 1023 | this->plt_ = new Output_data_plt_i386(symtab, layout, this->got_plt_); |
16649710 ILT |
1024 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1025 | (elfcpp::SHF_ALLOC | |
1026 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1027 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1028 | |
1029 | // Make the sh_info field of .rel.plt point to .plt. | |
1030 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1031 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1032 | } |
7223e9ca | 1033 | } |
a3ad94ed | 1034 | |
7223e9ca ILT |
1035 | // Create a PLT entry for a global symbol. |
1036 | ||
1037 | void | |
1038 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1039 | { | |
1040 | if (gsym->has_plt_offset()) | |
1041 | return; | |
1042 | if (this->plt_ == NULL) | |
1043 | this->make_plt_section(symtab, layout); | |
a3ad94ed ILT |
1044 | this->plt_->add_entry(gsym); |
1045 | } | |
1046 | ||
7223e9ca ILT |
1047 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1048 | ||
1049 | void | |
1050 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1051 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1052 | unsigned int local_sym_index) |
1053 | { | |
1054 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1055 | return; | |
1056 | if (this->plt_ == NULL) | |
1057 | this->make_plt_section(symtab, layout); | |
1058 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1059 | local_sym_index); | |
1060 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1061 | } | |
1062 | ||
0e70b911 CC |
1063 | // Return the number of entries in the PLT. |
1064 | ||
1065 | unsigned int | |
1066 | Target_i386::plt_entry_count() const | |
1067 | { | |
1068 | if (this->plt_ == NULL) | |
1069 | return 0; | |
1070 | return this->plt_->entry_count(); | |
1071 | } | |
1072 | ||
1073 | // Return the offset of the first non-reserved PLT entry. | |
1074 | ||
1075 | unsigned int | |
1076 | Target_i386::first_plt_entry_offset() const | |
1077 | { | |
1078 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1079 | } | |
1080 | ||
1081 | // Return the size of each PLT entry. | |
1082 | ||
1083 | unsigned int | |
1084 | Target_i386::plt_entry_size() const | |
1085 | { | |
1086 | return Output_data_plt_i386::get_plt_entry_size(); | |
1087 | } | |
1088 | ||
e291e7b9 ILT |
1089 | // Get the section to use for TLS_DESC relocations. |
1090 | ||
1091 | Target_i386::Reloc_section* | |
1092 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1093 | { | |
1094 | return this->plt_section()->rel_tls_desc(layout); | |
1095 | } | |
1096 | ||
9fa33bee | 1097 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1098 | |
1099 | void | |
1100 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1101 | { | |
1102 | if (this->tls_base_symbol_defined_) | |
1103 | return; | |
1104 | ||
1105 | Output_segment* tls_segment = layout->tls_segment(); | |
1106 | if (tls_segment != NULL) | |
1107 | { | |
183fd0e3 | 1108 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1109 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1110 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1111 | tls_segment, 0, 0, |
1112 | elfcpp::STT_TLS, | |
1113 | elfcpp::STB_LOCAL, | |
1114 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1115 | (is_exec |
1116 | ? Symbol::SEGMENT_END | |
1117 | : Symbol::SEGMENT_START), | |
1118 | true); | |
edfbb029 CC |
1119 | } |
1120 | this->tls_base_symbol_defined_ = true; | |
1121 | } | |
1122 | ||
94c4710f ILT |
1123 | // Create a GOT entry for the TLS module index. |
1124 | ||
1125 | unsigned int | |
1126 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1127 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1128 | { |
1129 | if (this->got_mod_index_offset_ == -1U) | |
1130 | { | |
1131 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1132 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1133 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1134 | unsigned int got_offset = got->add_constant(0); | |
1135 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1136 | got_offset); | |
009a67a2 | 1137 | got->add_constant(0); |
94c4710f ILT |
1138 | this->got_mod_index_offset_ = got_offset; |
1139 | } | |
1140 | return this->got_mod_index_offset_; | |
1141 | } | |
1142 | ||
92e059d8 | 1143 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1144 | // symbol. IS_FINAL is true if the final address of this symbol is |
1145 | // known at link time. | |
92e059d8 | 1146 | |
af6359d5 | 1147 | tls::Tls_optimization |
7e1edb90 | 1148 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1149 | { |
1150 | // If we are generating a shared library, then we can't do anything | |
1151 | // in the linker. | |
8851ecca | 1152 | if (parameters->options().shared()) |
af6359d5 | 1153 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1154 | |
1155 | switch (r_type) | |
1156 | { | |
1157 | case elfcpp::R_386_TLS_GD: | |
1158 | case elfcpp::R_386_TLS_GOTDESC: | |
1159 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1160 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1161 | // access. Since we know that we are generating an executable, |
1162 | // we can convert this to Initial-Exec. If we also know that | |
1163 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1164 | if (is_final) |
af6359d5 ILT |
1165 | return tls::TLSOPT_TO_LE; |
1166 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1167 | |
1168 | case elfcpp::R_386_TLS_LDM: | |
1169 | // This is Local-Dynamic, which refers to a local symbol in the | |
1170 | // dynamic TLS block. Since we know that we generating an | |
1171 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1172 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1173 | |
1174 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1175 | // Another type of Local-Dynamic relocation. |
1176 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1177 | |
1178 | case elfcpp::R_386_TLS_IE: | |
1179 | case elfcpp::R_386_TLS_GOTIE: | |
1180 | case elfcpp::R_386_TLS_IE_32: | |
1181 | // These are Initial-Exec relocs which get the thread offset | |
1182 | // from the GOT. If we know that we are linking against the | |
1183 | // local symbol, we can switch to Local-Exec, which links the | |
1184 | // thread offset into the instruction. | |
a3ad94ed | 1185 | if (is_final) |
af6359d5 ILT |
1186 | return tls::TLSOPT_TO_LE; |
1187 | return tls::TLSOPT_NONE; | |
8462ae85 | 1188 | |
92e059d8 ILT |
1189 | case elfcpp::R_386_TLS_LE: |
1190 | case elfcpp::R_386_TLS_LE_32: | |
1191 | // When we already have Local-Exec, there is nothing further we | |
1192 | // can do. | |
af6359d5 | 1193 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1194 | |
1195 | default: | |
a3ad94ed | 1196 | gold_unreachable(); |
92e059d8 ILT |
1197 | } |
1198 | } | |
1199 | ||
95a2c8d6 | 1200 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1201 | |
95a2c8d6 RS |
1202 | int |
1203 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1204 | { |
1205 | switch (r_type) | |
1206 | { | |
1207 | case elfcpp::R_386_NONE: | |
1208 | case elfcpp::R_386_GNU_VTINHERIT: | |
1209 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1210 | case elfcpp::R_386_GOTPC: |
1211 | // No symbol reference. | |
1212 | return 0; | |
7223e9ca ILT |
1213 | |
1214 | case elfcpp::R_386_32: | |
1215 | case elfcpp::R_386_16: | |
1216 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1217 | return Symbol::ABSOLUTE_REF; |
1218 | ||
7223e9ca ILT |
1219 | case elfcpp::R_386_PC32: |
1220 | case elfcpp::R_386_PC16: | |
1221 | case elfcpp::R_386_PC8: | |
7223e9ca | 1222 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1223 | return Symbol::RELATIVE_REF; |
1224 | ||
1225 | case elfcpp::R_386_PLT32: | |
1226 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1227 | ||
7223e9ca | 1228 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1229 | // Absolute in GOT. |
1230 | return Symbol::ABSOLUTE_REF; | |
1231 | ||
1232 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1233 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1234 | case elfcpp::R_386_TLS_DESC_CALL: | |
1235 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1236 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1237 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1238 | case elfcpp::R_386_TLS_IE_32: | |
1239 | case elfcpp::R_386_TLS_GOTIE: | |
1240 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1241 | case elfcpp::R_386_TLS_LE_32: | |
1242 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1243 | |
1244 | case elfcpp::R_386_COPY: | |
1245 | case elfcpp::R_386_GLOB_DAT: | |
1246 | case elfcpp::R_386_JUMP_SLOT: | |
1247 | case elfcpp::R_386_RELATIVE: | |
1248 | case elfcpp::R_386_IRELATIVE: | |
1249 | case elfcpp::R_386_TLS_TPOFF: | |
1250 | case elfcpp::R_386_TLS_DTPMOD32: | |
1251 | case elfcpp::R_386_TLS_DTPOFF32: | |
1252 | case elfcpp::R_386_TLS_TPOFF32: | |
1253 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1254 | case elfcpp::R_386_32PLT: |
1255 | case elfcpp::R_386_TLS_GD_32: | |
1256 | case elfcpp::R_386_TLS_GD_PUSH: | |
1257 | case elfcpp::R_386_TLS_GD_CALL: | |
1258 | case elfcpp::R_386_TLS_GD_POP: | |
1259 | case elfcpp::R_386_TLS_LDM_32: | |
1260 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1261 | case elfcpp::R_386_TLS_LDM_CALL: | |
1262 | case elfcpp::R_386_TLS_LDM_POP: | |
1263 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1264 | default: | |
95a2c8d6 RS |
1265 | // Not expected. We will give an error later. |
1266 | return 0; | |
7223e9ca ILT |
1267 | } |
1268 | } | |
1269 | ||
95a2c8d6 RS |
1270 | // Report an unsupported relocation against a local symbol. |
1271 | ||
1272 | void | |
6fa2a40b | 1273 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1274 | unsigned int r_type) |
1275 | { | |
1276 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1277 | object->name().c_str(), r_type); | |
1278 | } | |
1279 | ||
1280 | // Return whether we need to make a PLT entry for a relocation of a | |
1281 | // given type against a STT_GNU_IFUNC symbol. | |
1282 | ||
1283 | bool | |
6fa2a40b CC |
1284 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1285 | Sized_relobj_file<32, false>* object, | |
1286 | unsigned int r_type) | |
95a2c8d6 RS |
1287 | { |
1288 | int flags = Scan::get_reference_flags(r_type); | |
1289 | if (flags & Symbol::TLS_REF) | |
1290 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1291 | object->name().c_str(), r_type); | |
1292 | return flags != 0; | |
1293 | } | |
1294 | ||
92e059d8 ILT |
1295 | // Scan a relocation for a local symbol. |
1296 | ||
1297 | inline void | |
ad0f2072 | 1298 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1299 | Layout* layout, |
1300 | Target_i386* target, | |
6fa2a40b | 1301 | Sized_relobj_file<32, false>* object, |
1b64748b | 1302 | unsigned int data_shndx, |
07f397ab | 1303 | Output_section* output_section, |
1b64748b | 1304 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1305 | unsigned int r_type, |
7bf1f802 | 1306 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1307 | { |
7223e9ca ILT |
1308 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1309 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1310 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1311 | { | |
1312 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1313 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1314 | } | |
1315 | ||
92e059d8 ILT |
1316 | switch (r_type) |
1317 | { | |
1318 | case elfcpp::R_386_NONE: | |
1319 | case elfcpp::R_386_GNU_VTINHERIT: | |
1320 | case elfcpp::R_386_GNU_VTENTRY: | |
1321 | break; | |
1322 | ||
1323 | case elfcpp::R_386_32: | |
436ca963 ILT |
1324 | // If building a shared library (or a position-independent |
1325 | // executable), we need to create a dynamic relocation for | |
1326 | // this location. The relocation applied at link time will | |
1327 | // apply the link-time value, so we flag the location with | |
1328 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1329 | // relocate it easily. | |
8851ecca | 1330 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1331 | { |
1332 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1333 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1334 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1335 | output_section, data_shndx, | |
1336 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1337 | } |
1338 | break; | |
1339 | ||
1340 | case elfcpp::R_386_16: | |
1341 | case elfcpp::R_386_8: | |
1342 | // If building a shared library (or a position-independent | |
1343 | // executable), we need to create a dynamic relocation for | |
1344 | // this location. Because the addend needs to remain in the | |
1345 | // data section, we need to be careful not to apply this | |
1346 | // relocation statically. | |
8851ecca | 1347 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1348 | { |
1349 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1350 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1351 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1352 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1353 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1354 | else |
1355 | { | |
1356 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1357 | unsigned int shndx = lsym.get_st_shndx(); |
1358 | bool is_ordinary; | |
1359 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1360 | &is_ordinary); | |
1361 | if (!is_ordinary) | |
1362 | object->error(_("section symbol %u has bad shndx %u"), | |
1363 | r_sym, shndx); | |
1364 | else | |
1365 | rel_dyn->add_local_section(object, shndx, | |
1366 | r_type, output_section, | |
1367 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1368 | } |
436ca963 | 1369 | } |
92e059d8 ILT |
1370 | break; |
1371 | ||
1372 | case elfcpp::R_386_PC32: | |
1373 | case elfcpp::R_386_PC16: | |
1374 | case elfcpp::R_386_PC8: | |
1375 | break; | |
1376 | ||
df2efe71 ILT |
1377 | case elfcpp::R_386_PLT32: |
1378 | // Since we know this is a local symbol, we can handle this as a | |
1379 | // PC32 reloc. | |
1380 | break; | |
1381 | ||
ead1e424 ILT |
1382 | case elfcpp::R_386_GOTOFF: |
1383 | case elfcpp::R_386_GOTPC: | |
1384 | // We need a GOT section. | |
7e1edb90 | 1385 | target->got_section(symtab, layout); |
ead1e424 ILT |
1386 | break; |
1387 | ||
1b64748b ILT |
1388 | case elfcpp::R_386_GOT32: |
1389 | { | |
1390 | // The symbol requires a GOT entry. | |
1391 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1392 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1393 | |
1394 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1395 | // lets function pointers compare correctly with shared | |
1396 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1397 | bool is_new; | |
1398 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1399 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1400 | else | |
1401 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1402 | if (is_new) | |
1b64748b ILT |
1403 | { |
1404 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1405 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1406 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1407 | { |
1408 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1409 | unsigned int got_offset = |
1410 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1411 | rel_dyn->add_local_relative(object, r_sym, | |
1412 | elfcpp::R_386_RELATIVE, | |
1413 | got, got_offset); | |
1b64748b ILT |
1414 | } |
1415 | } | |
1416 | } | |
1417 | break; | |
1418 | ||
af6359d5 ILT |
1419 | // These are relocations which should only be seen by the |
1420 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1421 | case elfcpp::R_386_COPY: |
1422 | case elfcpp::R_386_GLOB_DAT: | |
1423 | case elfcpp::R_386_JUMP_SLOT: | |
1424 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1425 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1426 | case elfcpp::R_386_TLS_TPOFF: |
1427 | case elfcpp::R_386_TLS_DTPMOD32: | |
1428 | case elfcpp::R_386_TLS_DTPOFF32: | |
1429 | case elfcpp::R_386_TLS_TPOFF32: | |
1430 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1431 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1432 | object->name().c_str(), r_type); |
92e059d8 ILT |
1433 | break; |
1434 | ||
af6359d5 | 1435 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1436 | // linking. |
56622147 ILT |
1437 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1438 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1439 | case elfcpp::R_386_TLS_DESC_CALL: | |
1440 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1441 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1442 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1443 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1444 | case elfcpp::R_386_TLS_GOTIE: |
1445 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1446 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1447 | { |
8851ecca | 1448 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1449 | const tls::Tls_optimization optimized_type |
1450 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1451 | switch (r_type) |
1452 | { | |
56622147 | 1453 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1454 | if (optimized_type == tls::TLSOPT_NONE) |
1455 | { | |
1456 | // Create a pair of GOT entries for the module index and | |
1457 | // dtv-relative offset. | |
1458 | Output_data_got<32, false>* got | |
1459 | = target->got_section(symtab, layout); | |
1460 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1461 | unsigned int shndx = lsym.get_st_shndx(); |
1462 | bool is_ordinary; | |
1463 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1464 | if (!is_ordinary) | |
1465 | object->error(_("local symbol %u has bad shndx %u"), | |
1466 | r_sym, shndx); | |
1467 | else | |
1468 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1469 | GOT_TYPE_TLS_PAIR, | |
1470 | target->rel_dyn_section(layout), | |
1471 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1472 | } |
1473 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1474 | unsupported_reloc_local(object, r_type); | |
1475 | break; | |
1476 | ||
56622147 | 1477 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1478 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1479 | if (optimized_type == tls::TLSOPT_NONE) |
1480 | { | |
a8df5856 ILT |
1481 | // Create a double GOT entry with an R_386_TLS_DESC |
1482 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1483 | // lazily, so the GOT entry needs to be in an area in | |
1484 | // .got.plt, not .got. Call got_section to make sure | |
1485 | // the section has been created. | |
1486 | target->got_section(symtab, layout); | |
1487 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1488 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1489 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1490 | { | |
1491 | unsigned int got_offset = got->add_constant(0); | |
1492 | // The local symbol value is stored in the second | |
1493 | // GOT entry. | |
1494 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1495 | // That set the GOT offset of the local symbol to | |
1496 | // point to the second entry, but we want it to | |
1497 | // point to the first. | |
1498 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1499 | got_offset); | |
1500 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1501 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1502 | } | |
c2b45e22 CC |
1503 | } |
1504 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1505 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1506 | break; |
1507 | ||
c2b45e22 CC |
1508 | case elfcpp::R_386_TLS_DESC_CALL: |
1509 | break; | |
1510 | ||
56622147 | 1511 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1512 | if (optimized_type == tls::TLSOPT_NONE) |
1513 | { | |
1514 | // Create a GOT entry for the module index. | |
94c4710f | 1515 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1516 | } |
1517 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1518 | unsupported_reloc_local(object, r_type); |
1519 | break; | |
1520 | ||
56622147 | 1521 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1522 | break; |
1523 | ||
56622147 ILT |
1524 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1525 | case elfcpp::R_386_TLS_IE_32: | |
1526 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1527 | layout->set_has_static_tls(); |
07f397ab ILT |
1528 | if (optimized_type == tls::TLSOPT_NONE) |
1529 | { | |
7bf1f802 ILT |
1530 | // For the R_386_TLS_IE relocation, we need to create a |
1531 | // dynamic relocation when building a shared library. | |
1532 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1533 | && parameters->options().shared()) |
7bf1f802 ILT |
1534 | { |
1535 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1536 | unsigned int r_sym |
1537 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1538 | rel_dyn->add_local_relative(object, r_sym, | |
1539 | elfcpp::R_386_RELATIVE, | |
1540 | output_section, data_shndx, | |
1541 | reloc.get_r_offset()); | |
7bf1f802 | 1542 | } |
07f397ab ILT |
1543 | // Create a GOT entry for the tp-relative offset. |
1544 | Output_data_got<32, false>* got | |
1545 | = target->got_section(symtab, layout); | |
1546 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1547 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1548 | ? elfcpp::R_386_TLS_TPOFF32 | |
1549 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1550 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1551 | ? GOT_TYPE_TLS_OFFSET | |
1552 | : GOT_TYPE_TLS_NOFFSET); | |
1553 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1554 | target->rel_dyn_section(layout), |
1555 | dyn_r_type); | |
07f397ab ILT |
1556 | } |
1557 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1558 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1559 | break; |
af6359d5 | 1560 | |
56622147 ILT |
1561 | case elfcpp::R_386_TLS_LE: // Local-exec |
1562 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1563 | layout->set_has_static_tls(); |
07f397ab | 1564 | if (output_is_shared) |
7bf1f802 ILT |
1565 | { |
1566 | // We need to create a dynamic relocation. | |
dceae3c1 | 1567 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1568 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1569 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1570 | ? elfcpp::R_386_TLS_TPOFF32 | |
1571 | : elfcpp::R_386_TLS_TPOFF); | |
1572 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1573 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1574 | data_shndx, reloc.get_r_offset()); | |
1575 | } | |
56622147 ILT |
1576 | break; |
1577 | ||
af6359d5 ILT |
1578 | default: |
1579 | gold_unreachable(); | |
7e1edb90 ILT |
1580 | } |
1581 | } | |
92e059d8 ILT |
1582 | break; |
1583 | ||
92e059d8 ILT |
1584 | case elfcpp::R_386_32PLT: |
1585 | case elfcpp::R_386_TLS_GD_32: | |
1586 | case elfcpp::R_386_TLS_GD_PUSH: | |
1587 | case elfcpp::R_386_TLS_GD_CALL: | |
1588 | case elfcpp::R_386_TLS_GD_POP: | |
1589 | case elfcpp::R_386_TLS_LDM_32: | |
1590 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1591 | case elfcpp::R_386_TLS_LDM_CALL: | |
1592 | case elfcpp::R_386_TLS_LDM_POP: | |
1593 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1594 | default: | |
af6359d5 | 1595 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1596 | break; |
1597 | } | |
1598 | } | |
1599 | ||
af6359d5 ILT |
1600 | // Report an unsupported relocation against a global symbol. |
1601 | ||
1602 | void | |
6fa2a40b CC |
1603 | Target_i386::Scan::unsupported_reloc_global( |
1604 | Sized_relobj_file<32, false>* object, | |
1605 | unsigned int r_type, | |
1606 | Symbol* gsym) | |
af6359d5 | 1607 | { |
75f2446e | 1608 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1609 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1610 | } |
1611 | ||
0897ed3b ST |
1612 | inline bool |
1613 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1614 | { | |
1615 | switch (r_type) | |
1616 | { | |
1617 | case elfcpp::R_386_32: | |
1618 | case elfcpp::R_386_16: | |
1619 | case elfcpp::R_386_8: | |
1620 | case elfcpp::R_386_GOTOFF: | |
1621 | case elfcpp::R_386_GOT32: | |
1622 | { | |
1623 | return true; | |
1624 | } | |
1625 | default: | |
1626 | return false; | |
1627 | } | |
1628 | return false; | |
1629 | } | |
1630 | ||
1631 | inline bool | |
1632 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1633 | Symbol_table* , | |
1634 | Layout* , | |
1635 | Target_i386* , | |
6fa2a40b | 1636 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1637 | unsigned int , |
1638 | Output_section* , | |
1639 | const elfcpp::Rel<32, false>& , | |
1640 | unsigned int r_type, | |
1641 | const elfcpp::Sym<32, false>&) | |
1642 | { | |
1643 | return possible_function_pointer_reloc(r_type); | |
1644 | } | |
1645 | ||
1646 | inline bool | |
1647 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1648 | Symbol_table* , | |
1649 | Layout* , | |
1650 | Target_i386* , | |
6fa2a40b | 1651 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1652 | unsigned int , |
1653 | Output_section* , | |
1654 | const elfcpp::Rel<32, false>& , | |
1655 | unsigned int r_type, | |
1656 | Symbol*) | |
1657 | { | |
1658 | return possible_function_pointer_reloc(r_type); | |
1659 | } | |
1660 | ||
92e059d8 ILT |
1661 | // Scan a relocation for a global symbol. |
1662 | ||
1663 | inline void | |
ad0f2072 | 1664 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1665 | Layout* layout, |
1666 | Target_i386* target, | |
6fa2a40b | 1667 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 1668 | unsigned int data_shndx, |
07f397ab | 1669 | Output_section* output_section, |
a3ad94ed ILT |
1670 | const elfcpp::Rel<32, false>& reloc, |
1671 | unsigned int r_type, | |
92e059d8 ILT |
1672 | Symbol* gsym) |
1673 | { | |
7223e9ca ILT |
1674 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1675 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1676 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1677 | target->make_plt_entry(symtab, layout, gsym); | |
1678 | ||
92e059d8 ILT |
1679 | switch (r_type) |
1680 | { | |
1681 | case elfcpp::R_386_NONE: | |
1682 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1683 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1684 | break; |
1685 | ||
1686 | case elfcpp::R_386_32: | |
92e059d8 | 1687 | case elfcpp::R_386_16: |
92e059d8 | 1688 | case elfcpp::R_386_8: |
96f2030e | 1689 | { |
d61c6bd4 ILT |
1690 | // Make a PLT entry if necessary. |
1691 | if (gsym->needs_plt_entry()) | |
1692 | { | |
1693 | target->make_plt_entry(symtab, layout, gsym); | |
1694 | // Since this is not a PC-relative relocation, we may be | |
1695 | // taking the address of a function. In that case we need to | |
1696 | // set the entry in the dynamic symbol table to the address of | |
1697 | // the PLT entry. | |
8851ecca | 1698 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1699 | gsym->set_needs_dynsym_value(); |
1700 | } | |
1701 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1702 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1703 | { |
966d4097 | 1704 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1705 | { |
12c0daef | 1706 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1707 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1708 | } |
7223e9ca ILT |
1709 | else if (r_type == elfcpp::R_386_32 |
1710 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1711 | && gsym->can_use_relative_reloc(false) | |
1712 | && !gsym->is_from_dynobj() | |
1713 | && !gsym->is_undefined() | |
1714 | && !gsym->is_preemptible()) | |
1715 | { | |
1716 | // Use an IRELATIVE reloc for a locally defined | |
1717 | // STT_GNU_IFUNC symbol. This makes a function | |
1718 | // address in a PIE executable match the address in a | |
1719 | // shared library that it links against. | |
1720 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1721 | rel_dyn->add_symbolless_global_addend(gsym, | |
1722 | elfcpp::R_386_IRELATIVE, | |
1723 | output_section, | |
1724 | object, data_shndx, | |
1725 | reloc.get_r_offset()); | |
1726 | } | |
d61c6bd4 ILT |
1727 | else if (r_type == elfcpp::R_386_32 |
1728 | && gsym->can_use_relative_reloc(false)) | |
1729 | { | |
1730 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1731 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1732 | output_section, object, | |
1733 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1734 | } |
1735 | else | |
1736 | { | |
96f2030e | 1737 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1738 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1739 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1740 | } |
1741 | } | |
1742 | } | |
1743 | break; | |
1744 | ||
1745 | case elfcpp::R_386_PC32: | |
1746 | case elfcpp::R_386_PC16: | |
1747 | case elfcpp::R_386_PC8: | |
1748 | { | |
1749 | // Make a PLT entry if necessary. | |
1750 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1751 | { |
1752 | // These relocations are used for function calls only in | |
1753 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1754 | // we'll need a text relocation anyway, so we can skip the | |
1755 | // PLT entry and let the dynamic linker bind the call directly | |
1756 | // to the target. For smaller relocations, we should use a | |
1757 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1758 | if (!parameters->options().shared() |
7bf1f802 ILT |
1759 | || r_type != elfcpp::R_386_PC32) |
1760 | target->make_plt_entry(symtab, layout, gsym); | |
1761 | } | |
d61c6bd4 | 1762 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1763 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1764 | { |
966d4097 | 1765 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1766 | { |
12c0daef | 1767 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1768 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1769 | } |
86849f1f | 1770 | else |
d61c6bd4 ILT |
1771 | { |
1772 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1773 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1774 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1775 | } |
96f2030e ILT |
1776 | } |
1777 | } | |
92e059d8 ILT |
1778 | break; |
1779 | ||
ead1e424 | 1780 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1781 | { |
1782 | // The symbol requires a GOT entry. | |
7e1edb90 | 1783 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1784 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1785 | { |
1786 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1787 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1788 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1789 | else | |
1790 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1791 | } | |
7bf1f802 ILT |
1792 | else |
1793 | { | |
8462ae85 | 1794 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1795 | // GOT entry with a dynamic relocation. |
1796 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1797 | if (gsym->is_from_dynobj() |
1798 | || gsym->is_undefined() | |
7223e9ca ILT |
1799 | || gsym->is_preemptible() |
1800 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1801 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
1802 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1803 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1804 | else |
8462ae85 | 1805 | { |
7223e9ca ILT |
1806 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1807 | // offset into the GOT, so that function pointer | |
1808 | // comparisons work correctly. | |
1809 | bool is_new; | |
1810 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1811 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1812 | else | |
1813 | { | |
1814 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1815 | // Tell the dynamic linker to use the PLT address | |
1816 | // when resolving relocations. | |
1817 | if (gsym->is_from_dynobj() | |
1818 | && !parameters->options().shared()) | |
1819 | gsym->set_needs_dynsym_value(); | |
1820 | } | |
1821 | if (is_new) | |
1822 | { | |
1823 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1824 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
1825 | got, got_off); | |
1826 | } | |
8462ae85 ILT |
1827 | } |
1828 | } | |
1829 | } | |
ead1e424 ILT |
1830 | break; |
1831 | ||
1832 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1833 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1834 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1835 | if (gsym->final_value_is_known()) |
ead1e424 | 1836 | break; |
436ca963 ILT |
1837 | // If building a shared library, we can also skip the PLT entry |
1838 | // if the symbol is defined in the output file and is protected | |
1839 | // or hidden. | |
1840 | if (gsym->is_defined() | |
1841 | && !gsym->is_from_dynobj() | |
1842 | && !gsym->is_preemptible()) | |
1843 | break; | |
7e1edb90 | 1844 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1845 | break; |
1846 | ||
1847 | case elfcpp::R_386_GOTOFF: | |
1848 | case elfcpp::R_386_GOTPC: | |
1849 | // We need a GOT section. | |
7e1edb90 | 1850 | target->got_section(symtab, layout); |
ead1e424 ILT |
1851 | break; |
1852 | ||
af6359d5 ILT |
1853 | // These are relocations which should only be seen by the |
1854 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1855 | case elfcpp::R_386_COPY: |
1856 | case elfcpp::R_386_GLOB_DAT: | |
1857 | case elfcpp::R_386_JUMP_SLOT: | |
1858 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1859 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1860 | case elfcpp::R_386_TLS_TPOFF: |
1861 | case elfcpp::R_386_TLS_DTPMOD32: | |
1862 | case elfcpp::R_386_TLS_DTPOFF32: | |
1863 | case elfcpp::R_386_TLS_TPOFF32: | |
1864 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1865 | gold_error(_("%s: unexpected reloc %u in object file"), |
1866 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1867 | break; |
1868 | ||
d61c17ea ILT |
1869 | // These are initial tls relocs, which are expected when |
1870 | // linking. | |
56622147 ILT |
1871 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1872 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1873 | case elfcpp::R_386_TLS_DESC_CALL: | |
1874 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1875 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1876 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1877 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1878 | case elfcpp::R_386_TLS_GOTIE: |
1879 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1880 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1881 | { |
7e1edb90 | 1882 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1883 | const tls::Tls_optimization optimized_type |
1884 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1885 | switch (r_type) |
1886 | { | |
56622147 | 1887 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1888 | if (optimized_type == tls::TLSOPT_NONE) |
1889 | { | |
1890 | // Create a pair of GOT entries for the module index and | |
1891 | // dtv-relative offset. | |
1892 | Output_data_got<32, false>* got | |
1893 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1894 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1895 | target->rel_dyn_section(layout), |
1896 | elfcpp::R_386_TLS_DTPMOD32, | |
1897 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1898 | } |
1899 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1900 | { | |
1901 | // Create a GOT entry for the tp-relative offset. | |
1902 | Output_data_got<32, false>* got | |
1903 | = target->got_section(symtab, layout); | |
c2b45e22 | 1904 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1905 | target->rel_dyn_section(layout), |
c2b45e22 | 1906 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1907 | } |
1908 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1909 | unsupported_reloc_global(object, r_type, gsym); | |
1910 | break; | |
1911 | ||
56622147 | 1912 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1913 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1914 | if (optimized_type == tls::TLSOPT_NONE) |
1915 | { | |
a8df5856 ILT |
1916 | // Create a double GOT entry with an R_386_TLS_DESC |
1917 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1918 | // lazily, so the GOT entry needs to be in an area in | |
1919 | // .got.plt, not .got. Call got_section to make sure | |
1920 | // the section has been created. | |
1921 | target->got_section(symtab, layout); | |
1922 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1923 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1924 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1925 | elfcpp::R_386_TLS_DESC, 0); |
1926 | } | |
1927 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1928 | { | |
1929 | // Create a GOT entry for the tp-relative offset. | |
1930 | Output_data_got<32, false>* got | |
1931 | = target->got_section(symtab, layout); | |
1932 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1933 | target->rel_dyn_section(layout), | |
1934 | elfcpp::R_386_TLS_TPOFF); | |
1935 | } | |
1936 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1937 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1938 | break; |
1939 | ||
1940 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1941 | break; |
1942 | ||
56622147 | 1943 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1944 | if (optimized_type == tls::TLSOPT_NONE) |
1945 | { | |
1946 | // Create a GOT entry for the module index. | |
94c4710f | 1947 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1948 | } |
1949 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1950 | unsupported_reloc_global(object, r_type, gsym); |
1951 | break; | |
1952 | ||
56622147 | 1953 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1954 | break; |
1955 | ||
56622147 ILT |
1956 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1957 | case elfcpp::R_386_TLS_IE_32: | |
1958 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1959 | layout->set_has_static_tls(); |
07f397ab ILT |
1960 | if (optimized_type == tls::TLSOPT_NONE) |
1961 | { | |
7bf1f802 ILT |
1962 | // For the R_386_TLS_IE relocation, we need to create a |
1963 | // dynamic relocation when building a shared library. | |
1964 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1965 | && parameters->options().shared()) |
07f397ab | 1966 | { |
07f397ab | 1967 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1968 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1969 | output_section, object, | |
1970 | data_shndx, | |
1971 | reloc.get_r_offset()); | |
07f397ab | 1972 | } |
7bf1f802 ILT |
1973 | // Create a GOT entry for the tp-relative offset. |
1974 | Output_data_got<32, false>* got | |
1975 | = target->got_section(symtab, layout); | |
1976 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1977 | ? elfcpp::R_386_TLS_TPOFF32 | |
1978 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1979 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1980 | ? GOT_TYPE_TLS_OFFSET | |
1981 | : GOT_TYPE_TLS_NOFFSET); | |
1982 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1983 | target->rel_dyn_section(layout), |
1984 | dyn_r_type); | |
07f397ab ILT |
1985 | } |
1986 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1987 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1988 | break; |
af6359d5 | 1989 | |
56622147 ILT |
1990 | case elfcpp::R_386_TLS_LE: // Local-exec |
1991 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1992 | layout->set_has_static_tls(); |
8851ecca | 1993 | if (parameters->options().shared()) |
7bf1f802 ILT |
1994 | { |
1995 | // We need to create a dynamic relocation. | |
1996 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1997 | ? elfcpp::R_386_TLS_TPOFF32 | |
1998 | : elfcpp::R_386_TLS_TPOFF); | |
1999 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2000 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2001 | data_shndx, reloc.get_r_offset()); | |
2002 | } | |
56622147 ILT |
2003 | break; |
2004 | ||
af6359d5 ILT |
2005 | default: |
2006 | gold_unreachable(); | |
a3ad94ed ILT |
2007 | } |
2008 | } | |
92e059d8 ILT |
2009 | break; |
2010 | ||
92e059d8 ILT |
2011 | case elfcpp::R_386_32PLT: |
2012 | case elfcpp::R_386_TLS_GD_32: | |
2013 | case elfcpp::R_386_TLS_GD_PUSH: | |
2014 | case elfcpp::R_386_TLS_GD_CALL: | |
2015 | case elfcpp::R_386_TLS_GD_POP: | |
2016 | case elfcpp::R_386_TLS_LDM_32: | |
2017 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2018 | case elfcpp::R_386_TLS_LDM_CALL: | |
2019 | case elfcpp::R_386_TLS_LDM_POP: | |
2020 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2021 | default: | |
af6359d5 | 2022 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2023 | break; |
2024 | } | |
2025 | } | |
2026 | ||
6d03d481 ST |
2027 | // Process relocations for gc. |
2028 | ||
2029 | void | |
ad0f2072 | 2030 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 2031 | Layout* layout, |
6fa2a40b | 2032 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
2033 | unsigned int data_shndx, |
2034 | unsigned int, | |
2035 | const unsigned char* prelocs, | |
2036 | size_t reloc_count, | |
2037 | Output_section* output_section, | |
2038 | bool needs_special_offset_handling, | |
2039 | size_t local_symbol_count, | |
2040 | const unsigned char* plocal_symbols) | |
2041 | { | |
2042 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2043 | Target_i386::Scan, |
2044 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2045 | symtab, |
2046 | layout, | |
2047 | this, | |
2048 | object, | |
2049 | data_shndx, | |
2050 | prelocs, | |
2051 | reloc_count, | |
2052 | output_section, | |
2053 | needs_special_offset_handling, | |
2054 | local_symbol_count, | |
2055 | plocal_symbols); | |
2056 | } | |
2057 | ||
92e059d8 ILT |
2058 | // Scan relocations for a section. |
2059 | ||
2060 | void | |
ad0f2072 | 2061 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2062 | Layout* layout, |
6fa2a40b | 2063 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 2064 | unsigned int data_shndx, |
92e059d8 ILT |
2065 | unsigned int sh_type, |
2066 | const unsigned char* prelocs, | |
2067 | size_t reloc_count, | |
730cdc88 ILT |
2068 | Output_section* output_section, |
2069 | bool needs_special_offset_handling, | |
92e059d8 | 2070 | size_t local_symbol_count, |
730cdc88 | 2071 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2072 | { |
2073 | if (sh_type == elfcpp::SHT_RELA) | |
2074 | { | |
75f2446e ILT |
2075 | gold_error(_("%s: unsupported RELA reloc section"), |
2076 | object->name().c_str()); | |
2077 | return; | |
92e059d8 ILT |
2078 | } |
2079 | ||
ead1e424 ILT |
2080 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2081 | Target_i386::Scan>( | |
92e059d8 | 2082 | symtab, |
ead1e424 ILT |
2083 | layout, |
2084 | this, | |
92e059d8 | 2085 | object, |
a3ad94ed | 2086 | data_shndx, |
92e059d8 ILT |
2087 | prelocs, |
2088 | reloc_count, | |
730cdc88 ILT |
2089 | output_section, |
2090 | needs_special_offset_handling, | |
92e059d8 | 2091 | local_symbol_count, |
730cdc88 | 2092 | plocal_symbols); |
92e059d8 ILT |
2093 | } |
2094 | ||
16649710 | 2095 | // Finalize the sections. |
5a6f7e2d ILT |
2096 | |
2097 | void | |
f59f41f3 DK |
2098 | Target_i386::do_finalize_sections( |
2099 | Layout* layout, | |
2100 | const Input_objects*, | |
e785ec03 | 2101 | Symbol_table* symtab) |
5a6f7e2d | 2102 | { |
ea715a34 ILT |
2103 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2104 | ? NULL | |
2105 | : this->plt_->rel_plt()); | |
2106 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2107 | this->rel_dyn_, true, false); |
16649710 ILT |
2108 | |
2109 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2110 | // relocs. | |
12c0daef ILT |
2111 | if (this->copy_relocs_.any_saved_relocs()) |
2112 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2113 | |
2114 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2115 | // the .got.plt section. | |
2116 | Symbol* sym = this->global_offset_table_; | |
2117 | if (sym != NULL) | |
2118 | { | |
2119 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2120 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2121 | } | |
5a6f7e2d ILT |
2122 | } |
2123 | ||
86849f1f ILT |
2124 | // Return whether a direct absolute static relocation needs to be applied. |
2125 | // In cases where Scan::local() or Scan::global() has created | |
2126 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2127 | // of the relocation is carried in the data, and we must not | |
2128 | // apply the static relocation. | |
2129 | ||
2130 | inline bool | |
2131 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2132 | unsigned int r_type, |
031cdbed ILT |
2133 | bool is_32bit, |
2134 | Output_section* output_section) | |
86849f1f | 2135 | { |
031cdbed ILT |
2136 | // If the output section is not allocated, then we didn't call |
2137 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2138 | // the reloc here. | |
2139 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2140 | return true; | |
2141 | ||
95a2c8d6 RS |
2142 | int ref_flags = Scan::get_reference_flags(r_type); |
2143 | ||
d61c6bd4 ILT |
2144 | // For local symbols, we will have created a non-RELATIVE dynamic |
2145 | // relocation only if (a) the output is position independent, | |
2146 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2147 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2148 | if (gsym == NULL) |
8851ecca | 2149 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2150 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2151 | && !is_32bit); |
86849f1f | 2152 | |
0700cf32 ILT |
2153 | // For global symbols, we use the same helper routines used in the |
2154 | // scan pass. If we did not create a dynamic relocation, or if we | |
2155 | // created a RELATIVE dynamic relocation, we should apply the static | |
2156 | // relocation. | |
2157 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2158 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2159 | && gsym->can_use_relative_reloc(ref_flags | |
2160 | & Symbol::FUNCTION_CALL); | |
2161 | return !has_dyn || is_rel; | |
86849f1f ILT |
2162 | } |
2163 | ||
61ba1cf9 ILT |
2164 | // Perform a relocation. |
2165 | ||
ead1e424 | 2166 | inline bool |
92e059d8 | 2167 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2168 | Target_i386* target, |
ca09d69a | 2169 | Output_section* output_section, |
92e059d8 ILT |
2170 | size_t relnum, |
2171 | const elfcpp::Rel<32, false>& rel, | |
2172 | unsigned int r_type, | |
c06b7b0b | 2173 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2174 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2175 | unsigned char* view, |
2176 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2177 | section_size_type view_size) |
61ba1cf9 | 2178 | { |
ead1e424 ILT |
2179 | if (this->skip_call_tls_get_addr_) |
2180 | { | |
5efc7cd2 CC |
2181 | if ((r_type != elfcpp::R_386_PLT32 |
2182 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2183 | || gsym == NULL |
2184 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2185 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2186 | _("missing expected TLS relocation")); | |
2187 | else | |
ead1e424 | 2188 | { |
75f2446e ILT |
2189 | this->skip_call_tls_get_addr_ = false; |
2190 | return false; | |
ead1e424 | 2191 | } |
ead1e424 ILT |
2192 | } |
2193 | ||
6fa2a40b | 2194 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2195 | |
a3ad94ed | 2196 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2197 | Symbol_value<32> symval; |
436ca963 | 2198 | if (gsym != NULL |
7223e9ca ILT |
2199 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2200 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2201 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2202 | && gsym->can_use_relative_reloc(false) |
2203 | && !gsym->is_from_dynobj() | |
2204 | && !gsym->is_undefined() | |
2205 | && !gsym->is_preemptible()) | |
2206 | { | |
2207 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2208 | // want to use the real value of the symbol, not the PLT offset. | |
2209 | } | |
2210 | else if (gsym != NULL | |
95a2c8d6 | 2211 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2212 | { |
b8e6aad9 ILT |
2213 | symval.set_output_value(target->plt_section()->address() |
2214 | + gsym->plt_offset()); | |
2215 | psymval = &symval; | |
a3ad94ed | 2216 | } |
7223e9ca ILT |
2217 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2218 | { | |
2219 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2220 | if (object->local_has_plt_offset(r_sym)) | |
2221 | { | |
2222 | symval.set_output_value(target->plt_section()->address() | |
2223 | + object->local_plt_offset(r_sym)); | |
2224 | psymval = &symval; | |
2225 | } | |
2226 | } | |
b8e6aad9 | 2227 | |
1b64748b | 2228 | // Get the GOT offset if needed. |
96f2030e ILT |
2229 | // The GOT pointer points to the end of the GOT section. |
2230 | // We need to subtract the size of the GOT section to get | |
2231 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2232 | bool have_got_offset = false; |
2233 | unsigned int got_offset = 0; | |
2234 | switch (r_type) | |
2235 | { | |
2236 | case elfcpp::R_386_GOT32: | |
2237 | if (gsym != NULL) | |
2238 | { | |
0a65a3a7 CC |
2239 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2240 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2241 | - target->got_size()); | |
1b64748b ILT |
2242 | } |
2243 | else | |
2244 | { | |
2245 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2246 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2247 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2248 | - target->got_size()); | |
1b64748b ILT |
2249 | } |
2250 | have_got_offset = true; | |
2251 | break; | |
2252 | ||
2253 | default: | |
2254 | break; | |
2255 | } | |
2256 | ||
61ba1cf9 ILT |
2257 | switch (r_type) |
2258 | { | |
2259 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2260 | case elfcpp::R_386_GNU_VTINHERIT: |
2261 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2262 | break; |
2263 | ||
2264 | case elfcpp::R_386_32: | |
95a2c8d6 | 2265 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2266 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2267 | break; |
2268 | ||
2269 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2270 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2271 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2272 | break; |
2273 | ||
2274 | case elfcpp::R_386_16: | |
95a2c8d6 | 2275 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2276 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2277 | break; |
2278 | ||
2279 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2280 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2281 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2282 | break; |
2283 | ||
92e059d8 | 2284 | case elfcpp::R_386_8: |
95a2c8d6 | 2285 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2286 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2287 | break; |
2288 | ||
2289 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2290 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2291 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2292 | break; |
2293 | ||
ead1e424 | 2294 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2295 | gold_assert(gsym == NULL |
2296 | || gsym->has_plt_offset() | |
99f8faca ILT |
2297 | || gsym->final_value_is_known() |
2298 | || (gsym->is_defined() | |
2299 | && !gsym->is_from_dynobj() | |
2300 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2301 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2302 | break; |
2303 | ||
2304 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2305 | gold_assert(have_got_offset); |
2306 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2307 | break; |
2308 | ||
2309 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2310 | { |
2311 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2312 | value = (psymval->value(object, 0) | |
96f2030e | 2313 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2314 | Relocate_functions<32, false>::rel32(view, value); |
2315 | } | |
ead1e424 ILT |
2316 | break; |
2317 | ||
2318 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2319 | { |
2320 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2321 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2322 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2323 | } | |
ead1e424 ILT |
2324 | break; |
2325 | ||
92e059d8 ILT |
2326 | case elfcpp::R_386_COPY: |
2327 | case elfcpp::R_386_GLOB_DAT: | |
2328 | case elfcpp::R_386_JUMP_SLOT: | |
2329 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2330 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2331 | // These are outstanding tls relocs, which are unexpected when |
2332 | // linking. | |
92e059d8 ILT |
2333 | case elfcpp::R_386_TLS_TPOFF: |
2334 | case elfcpp::R_386_TLS_DTPMOD32: | |
2335 | case elfcpp::R_386_TLS_DTPOFF32: | |
2336 | case elfcpp::R_386_TLS_TPOFF32: | |
2337 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2338 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2339 | _("unexpected reloc %u in object file"), | |
2340 | r_type); | |
92e059d8 ILT |
2341 | break; |
2342 | ||
d61c17ea ILT |
2343 | // These are initial tls relocs, which are expected when |
2344 | // linking. | |
56622147 ILT |
2345 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2346 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2347 | case elfcpp::R_386_TLS_DESC_CALL: | |
2348 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2349 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2350 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2351 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2352 | case elfcpp::R_386_TLS_GOTIE: |
2353 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2354 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2355 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2356 | view, address, view_size); | |
92e059d8 ILT |
2357 | break; |
2358 | ||
92e059d8 ILT |
2359 | case elfcpp::R_386_32PLT: |
2360 | case elfcpp::R_386_TLS_GD_32: | |
2361 | case elfcpp::R_386_TLS_GD_PUSH: | |
2362 | case elfcpp::R_386_TLS_GD_CALL: | |
2363 | case elfcpp::R_386_TLS_GD_POP: | |
2364 | case elfcpp::R_386_TLS_LDM_32: | |
2365 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2366 | case elfcpp::R_386_TLS_LDM_CALL: | |
2367 | case elfcpp::R_386_TLS_LDM_POP: | |
2368 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2369 | default: |
75f2446e ILT |
2370 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2371 | _("unsupported reloc %u"), | |
2372 | r_type); | |
92e059d8 ILT |
2373 | break; |
2374 | } | |
ead1e424 ILT |
2375 | |
2376 | return true; | |
92e059d8 ILT |
2377 | } |
2378 | ||
2379 | // Perform a TLS relocation. | |
2380 | ||
2381 | inline void | |
2382 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2383 | Target_i386* target, |
92e059d8 ILT |
2384 | size_t relnum, |
2385 | const elfcpp::Rel<32, false>& rel, | |
2386 | unsigned int r_type, | |
c06b7b0b | 2387 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2388 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2389 | unsigned char* view, |
2390 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2391 | section_size_type view_size) |
92e059d8 ILT |
2392 | { |
2393 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2394 | |
6fa2a40b | 2395 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2396 | |
2397 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2398 | |
b3705d2a ILT |
2399 | const bool is_final = (gsym == NULL |
2400 | ? !parameters->options().shared() | |
2401 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2402 | const tls::Tls_optimization optimized_type |
2403 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2404 | switch (r_type) |
2405 | { | |
56622147 | 2406 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2407 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2408 | { |
07f397ab | 2409 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2410 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2411 | rel, r_type, value, view, | |
2412 | view_size); | |
92e059d8 ILT |
2413 | break; |
2414 | } | |
07f397ab ILT |
2415 | else |
2416 | { | |
c2b45e22 CC |
2417 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2418 | ? GOT_TYPE_TLS_NOFFSET | |
2419 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2420 | unsigned int got_offset; |
2421 | if (gsym != NULL) | |
2422 | { | |
c2b45e22 CC |
2423 | gold_assert(gsym->has_got_offset(got_type)); |
2424 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2425 | } |
2426 | else | |
2427 | { | |
2428 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2429 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2430 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2431 | - target->got_size()); |
2432 | } | |
2433 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2434 | { | |
2435 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2436 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2437 | got_offset, view, view_size); | |
07f397ab ILT |
2438 | break; |
2439 | } | |
2440 | else if (optimized_type == tls::TLSOPT_NONE) | |
2441 | { | |
2442 | // Relocate the field with the offset of the pair of GOT | |
2443 | // entries. | |
2444 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2445 | break; | |
2446 | } | |
2447 | } | |
75f2446e ILT |
2448 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2449 | _("unsupported reloc %u"), | |
2450 | r_type); | |
92e059d8 ILT |
2451 | break; |
2452 | ||
56622147 ILT |
2453 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2454 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2455 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2456 | if (optimized_type == tls::TLSOPT_TO_LE) |
2457 | { | |
2458 | gold_assert(tls_segment != NULL); | |
2459 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2460 | rel, r_type, value, view, | |
2461 | view_size); | |
2462 | break; | |
2463 | } | |
2464 | else | |
2465 | { | |
2466 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2467 | ? GOT_TYPE_TLS_NOFFSET | |
2468 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2469 | unsigned int got_offset = 0; |
2470 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2471 | && optimized_type == tls::TLSOPT_NONE) | |
2472 | { | |
2473 | // We created GOT entries in the .got.tlsdesc portion of | |
2474 | // the .got.plt section, but the offset stored in the | |
2475 | // symbol is the offset within .got.tlsdesc. | |
2476 | got_offset = (target->got_size() | |
2477 | + target->got_plt_section()->data_size()); | |
2478 | } | |
c2b45e22 CC |
2479 | if (gsym != NULL) |
2480 | { | |
2481 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2482 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2483 | } |
2484 | else | |
2485 | { | |
2486 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2487 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2488 | got_offset += (object->local_got_offset(r_sym, got_type) |
2489 | - target->got_size()); | |
c2b45e22 CC |
2490 | } |
2491 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2492 | { | |
2493 | gold_assert(tls_segment != NULL); | |
2494 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2495 | got_offset, view, view_size); | |
2496 | break; | |
2497 | } | |
2498 | else if (optimized_type == tls::TLSOPT_NONE) | |
2499 | { | |
2500 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2501 | { | |
2502 | // Relocate the field with the offset of the pair of GOT | |
2503 | // entries. | |
2504 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2505 | } | |
2506 | break; | |
2507 | } | |
2508 | } | |
75f2446e ILT |
2509 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2510 | _("unsupported reloc %u"), | |
2511 | r_type); | |
ead1e424 ILT |
2512 | break; |
2513 | ||
56622147 | 2514 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2515 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2516 | { | |
75f2446e ILT |
2517 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2518 | _("both SUN and GNU model " | |
2519 | "TLS relocations")); | |
2520 | break; | |
46cf9fa2 ILT |
2521 | } |
2522 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2523 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2524 | { |
07f397ab | 2525 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2526 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2527 | value, view, view_size); | |
2528 | break; | |
2529 | } | |
07f397ab ILT |
2530 | else if (optimized_type == tls::TLSOPT_NONE) |
2531 | { | |
2532 | // Relocate the field with the offset of the GOT entry for | |
2533 | // the module index. | |
2534 | unsigned int got_offset; | |
94c4710f ILT |
2535 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2536 | - target->got_size()); | |
07f397ab ILT |
2537 | Relocate_functions<32, false>::rel32(view, got_offset); |
2538 | break; | |
2539 | } | |
75f2446e ILT |
2540 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2541 | _("unsupported reloc %u"), | |
2542 | r_type); | |
46cf9fa2 ILT |
2543 | break; |
2544 | ||
56622147 | 2545 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2546 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2547 | { |
82bb573a ILT |
2548 | // This reloc can appear in debugging sections, in which |
2549 | // case we must not convert to local-exec. We decide what | |
2550 | // to do based on whether the section is marked as | |
2551 | // containing executable code. That is what the GNU linker | |
2552 | // does as well. | |
2553 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2554 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2555 | { |
2556 | gold_assert(tls_segment != NULL); | |
2557 | value -= tls_segment->memsz(); | |
2558 | } | |
e8a9fcda | 2559 | } |
46cf9fa2 ILT |
2560 | Relocate_functions<32, false>::rel32(view, value); |
2561 | break; | |
2562 | ||
56622147 ILT |
2563 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2564 | case elfcpp::R_386_TLS_GOTIE: | |
2565 | case elfcpp::R_386_TLS_IE_32: | |
2566 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2567 | { | |
07f397ab | 2568 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2569 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2570 | rel, r_type, value, view, | |
2571 | view_size); | |
2572 | break; | |
2573 | } | |
07f397ab ILT |
2574 | else if (optimized_type == tls::TLSOPT_NONE) |
2575 | { | |
2576 | // Relocate the field with the offset of the GOT entry for | |
2577 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2578 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2579 | ? GOT_TYPE_TLS_OFFSET | |
2580 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2581 | unsigned int got_offset; |
2582 | if (gsym != NULL) | |
2583 | { | |
c2b45e22 CC |
2584 | gold_assert(gsym->has_got_offset(got_type)); |
2585 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2586 | } |
2587 | else | |
2588 | { | |
2589 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2590 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2591 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2592 | } |
2593 | // For the R_386_TLS_IE relocation, we need to apply the | |
2594 | // absolute address of the GOT entry. | |
2595 | if (r_type == elfcpp::R_386_TLS_IE) | |
2596 | got_offset += target->got_plt_section()->address(); | |
2597 | // All GOT offsets are relative to the end of the GOT. | |
2598 | got_offset -= target->got_size(); | |
2599 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2600 | break; | |
2601 | } | |
75f2446e ILT |
2602 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2603 | _("unsupported reloc %u"), | |
2604 | r_type); | |
92e059d8 | 2605 | break; |
92e059d8 | 2606 | |
56622147 | 2607 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2608 | // If we're creating a shared library, a dynamic relocation will |
2609 | // have been created for this location, so do not apply it now. | |
8851ecca | 2610 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2611 | { |
2612 | gold_assert(tls_segment != NULL); | |
2613 | value -= tls_segment->memsz(); | |
2614 | Relocate_functions<32, false>::rel32(view, value); | |
2615 | } | |
56622147 | 2616 | break; |
92e059d8 | 2617 | |
56622147 | 2618 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2619 | // If we're creating a shared library, a dynamic relocation will |
2620 | // have been created for this location, so do not apply it now. | |
8851ecca | 2621 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2622 | { |
2623 | gold_assert(tls_segment != NULL); | |
2624 | value = tls_segment->memsz() - value; | |
2625 | Relocate_functions<32, false>::rel32(view, value); | |
2626 | } | |
56622147 | 2627 | break; |
92e059d8 | 2628 | } |
92e059d8 ILT |
2629 | } |
2630 | ||
e041f13d | 2631 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2632 | // Local-Exec. |
2633 | ||
2634 | inline void | |
2635 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2636 | size_t relnum, | |
2637 | Output_segment* tls_segment, | |
2638 | const elfcpp::Rel<32, false>& rel, | |
2639 | unsigned int, | |
2640 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2641 | unsigned char* view, | |
fe8718a4 | 2642 | section_size_type view_size) |
ead1e424 ILT |
2643 | { |
2644 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2645 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2646 | // leal foo(%reg),%eax; call ___tls_get_addr |
2647 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2648 | ||
af6359d5 ILT |
2649 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2650 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2651 | |
2652 | unsigned char op1 = view[-1]; | |
2653 | unsigned char op2 = view[-2]; | |
2654 | ||
af6359d5 ILT |
2655 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2656 | op2 == 0x8d || op2 == 0x04); | |
2657 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2658 | |
2659 | int roff = 5; | |
2660 | ||
2661 | if (op2 == 0x04) | |
2662 | { | |
af6359d5 ILT |
2663 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2664 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2665 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2666 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2667 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2668 | } | |
2669 | else | |
2670 | { | |
af6359d5 ILT |
2671 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2672 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2673 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2674 | && view[9] == 0x90) |
ead1e424 ILT |
2675 | { |
2676 | // There is a trailing nop. Use the size byte subl. | |
2677 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2678 | roff = 6; | |
2679 | } | |
2680 | else | |
2681 | { | |
2682 | // Use the five byte subl. | |
2683 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2684 | } | |
2685 | } | |
2686 | ||
7bf1f802 | 2687 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2688 | Relocate_functions<32, false>::rel32(view + roff, value); |
2689 | ||
2690 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2691 | // We can skip it. | |
2692 | this->skip_call_tls_get_addr_ = true; | |
2693 | } | |
2694 | ||
7bf1f802 | 2695 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2696 | // Initial-Exec. |
2697 | ||
2698 | inline void | |
2699 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2700 | size_t relnum, | |
c2b45e22 | 2701 | Output_segment*, |
07f397ab ILT |
2702 | const elfcpp::Rel<32, false>& rel, |
2703 | unsigned int, | |
2704 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2705 | unsigned char* view, | |
fe8718a4 | 2706 | section_size_type view_size) |
07f397ab ILT |
2707 | { |
2708 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2709 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2710 | ||
2711 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2712 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2713 | ||
2714 | unsigned char op1 = view[-1]; | |
2715 | unsigned char op2 = view[-2]; | |
2716 | ||
2717 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2718 | op2 == 0x8d || op2 == 0x04); | |
2719 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2720 | ||
2721 | int roff = 5; | |
2722 | ||
c2b45e22 CC |
2723 | // FIXME: For now, support only the first (SIB) form. |
2724 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2725 | |
2726 | if (op2 == 0x04) | |
2727 | { | |
2728 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2729 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2730 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2731 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2732 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2733 | } | |
2734 | else | |
2735 | { | |
2736 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2737 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2738 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2739 | && view[9] == 0x90) |
2740 | { | |
2741 | // FIXME: This is not the right instruction sequence. | |
2742 | // There is a trailing nop. Use the size byte subl. | |
2743 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2744 | roff = 6; | |
2745 | } | |
2746 | else | |
2747 | { | |
2748 | // FIXME: This is not the right instruction sequence. | |
2749 | // Use the five byte subl. | |
2750 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2751 | } | |
2752 | } | |
2753 | ||
07f397ab ILT |
2754 | Relocate_functions<32, false>::rel32(view + roff, value); |
2755 | ||
2756 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2757 | // We can skip it. | |
2758 | this->skip_call_tls_get_addr_ = true; | |
2759 | } | |
2760 | ||
c2b45e22 CC |
2761 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2762 | // General-Dynamic to a Local-Exec. | |
2763 | ||
2764 | inline void | |
2765 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2766 | const Relocate_info<32, false>* relinfo, | |
2767 | size_t relnum, | |
2768 | Output_segment* tls_segment, | |
2769 | const elfcpp::Rel<32, false>& rel, | |
2770 | unsigned int r_type, | |
2771 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2772 | unsigned char* view, | |
2773 | section_size_type view_size) | |
2774 | { | |
2775 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2776 | { | |
2777 | // leal foo@TLSDESC(%ebx), %eax | |
2778 | // ==> leal foo@NTPOFF, %eax | |
2779 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2780 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2781 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2782 | view[-2] == 0x8d && view[-1] == 0x83); | |
2783 | view[-1] = 0x05; | |
2784 | value -= tls_segment->memsz(); | |
2785 | Relocate_functions<32, false>::rel32(view, value); | |
2786 | } | |
2787 | else | |
2788 | { | |
2789 | // call *foo@TLSCALL(%eax) | |
2790 | // ==> nop; nop | |
2791 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2792 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2793 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2794 | view[0] == 0xff && view[1] == 0x10); | |
2795 | view[0] = 0x66; | |
2796 | view[1] = 0x90; | |
2797 | } | |
2798 | } | |
2799 | ||
2800 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2801 | // General-Dynamic to an Initial-Exec. | |
2802 | ||
2803 | inline void | |
2804 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2805 | const Relocate_info<32, false>* relinfo, | |
2806 | size_t relnum, | |
2807 | Output_segment*, | |
2808 | const elfcpp::Rel<32, false>& rel, | |
2809 | unsigned int r_type, | |
2810 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2811 | unsigned char* view, | |
2812 | section_size_type view_size) | |
2813 | { | |
2814 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2815 | { | |
2816 | // leal foo@TLSDESC(%ebx), %eax | |
2817 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2818 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2819 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2820 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2821 | view[-2] == 0x8d && view[-1] == 0x83); | |
2822 | view[-2] = 0x8b; | |
2823 | Relocate_functions<32, false>::rel32(view, value); | |
2824 | } | |
2825 | else | |
2826 | { | |
2827 | // call *foo@TLSCALL(%eax) | |
2828 | // ==> nop; nop | |
2829 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2830 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2831 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2832 | view[0] == 0xff && view[1] == 0x10); | |
2833 | view[0] = 0x66; | |
2834 | view[1] = 0x90; | |
2835 | } | |
2836 | } | |
2837 | ||
46cf9fa2 ILT |
2838 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2839 | // Local-Exec. | |
2840 | ||
2841 | inline void | |
2842 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2843 | size_t relnum, | |
2844 | Output_segment*, | |
2845 | const elfcpp::Rel<32, false>& rel, | |
2846 | unsigned int, | |
2847 | elfcpp::Elf_types<32>::Elf_Addr, | |
2848 | unsigned char* view, | |
fe8718a4 | 2849 | section_size_type view_size) |
46cf9fa2 ILT |
2850 | { |
2851 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2852 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2853 | ||
af6359d5 ILT |
2854 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2855 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2856 | |
2857 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2858 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2859 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2860 | |
af6359d5 | 2861 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2862 | |
2863 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2864 | ||
2865 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2866 | // We can skip it. | |
2867 | this->skip_call_tls_get_addr_ = true; | |
2868 | } | |
2869 | ||
56622147 ILT |
2870 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2871 | // Local-Exec. | |
2872 | ||
2873 | inline void | |
2874 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2875 | size_t relnum, | |
2876 | Output_segment* tls_segment, | |
2877 | const elfcpp::Rel<32, false>& rel, | |
2878 | unsigned int r_type, | |
2879 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2880 | unsigned char* view, | |
fe8718a4 | 2881 | section_size_type view_size) |
56622147 ILT |
2882 | { |
2883 | // We have to actually change the instructions, which means that we | |
2884 | // need to examine the opcodes to figure out which instruction we | |
2885 | // are looking at. | |
2886 | if (r_type == elfcpp::R_386_TLS_IE) | |
2887 | { | |
2888 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2889 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2890 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2891 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2892 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2893 | ||
2894 | unsigned char op1 = view[-1]; | |
2895 | if (op1 == 0xa1) | |
2896 | { | |
2897 | // movl XX,%eax ==> movl $YY,%eax | |
2898 | view[-1] = 0xb8; | |
2899 | } | |
2900 | else | |
2901 | { | |
2902 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2903 | ||
2904 | unsigned char op2 = view[-2]; | |
2905 | if (op2 == 0x8b) | |
2906 | { | |
2907 | // movl XX,%reg ==> movl $YY,%reg | |
2908 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2909 | (op1 & 0xc7) == 0x05); | |
2910 | view[-2] = 0xc7; | |
2911 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2912 | } | |
2913 | else if (op2 == 0x03) | |
2914 | { | |
2915 | // addl XX,%reg ==> addl $YY,%reg | |
2916 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2917 | (op1 & 0xc7) == 0x05); | |
2918 | view[-2] = 0x81; | |
2919 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2920 | } | |
2921 | else | |
2922 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2923 | } | |
2924 | } | |
2925 | else | |
2926 | { | |
2927 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2928 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2929 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2930 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2931 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2932 | ||
2933 | unsigned char op1 = view[-1]; | |
2934 | unsigned char op2 = view[-2]; | |
2935 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2936 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2937 | if (op2 == 0x8b) | |
2938 | { | |
2939 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2940 | view[-2] = 0xc7; | |
2941 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2942 | } | |
2943 | else if (op2 == 0x2b) | |
2944 | { | |
2945 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2946 | view[-2] = 0x81; | |
2947 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2948 | } | |
2949 | else if (op2 == 0x03) | |
2950 | { | |
2951 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2952 | view[-2] = 0x81; | |
2953 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2954 | } | |
2955 | else | |
2956 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2957 | } | |
2958 | ||
7bf1f802 | 2959 | value = tls_segment->memsz() - value; |
56622147 ILT |
2960 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2961 | value = - value; | |
2962 | ||
2963 | Relocate_functions<32, false>::rel32(view, value); | |
2964 | } | |
2965 | ||
61ba1cf9 ILT |
2966 | // Relocate section data. |
2967 | ||
2968 | void | |
92e059d8 | 2969 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2970 | unsigned int sh_type, |
2971 | const unsigned char* prelocs, | |
2972 | size_t reloc_count, | |
730cdc88 ILT |
2973 | Output_section* output_section, |
2974 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2975 | unsigned char* view, |
2976 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2977 | section_size_type view_size, |
2978 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2979 | { |
a3ad94ed | 2980 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2981 | |
ead1e424 ILT |
2982 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2983 | Target_i386::Relocate>( | |
92e059d8 | 2984 | relinfo, |
ead1e424 | 2985 | this, |
61ba1cf9 ILT |
2986 | prelocs, |
2987 | reloc_count, | |
730cdc88 ILT |
2988 | output_section, |
2989 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2990 | view, |
2991 | address, | |
364c7fa5 ILT |
2992 | view_size, |
2993 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2994 | } |
2995 | ||
6a74a719 ILT |
2996 | // Return the size of a relocation while scanning during a relocatable |
2997 | // link. | |
2998 | ||
2999 | unsigned int | |
3000 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3001 | unsigned int r_type, | |
3002 | Relobj* object) | |
3003 | { | |
3004 | switch (r_type) | |
3005 | { | |
3006 | case elfcpp::R_386_NONE: | |
3007 | case elfcpp::R_386_GNU_VTINHERIT: | |
3008 | case elfcpp::R_386_GNU_VTENTRY: | |
3009 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3010 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3011 | case elfcpp::R_386_TLS_DESC_CALL: | |
3012 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3013 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3014 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3015 | case elfcpp::R_386_TLS_IE_32: | |
3016 | case elfcpp::R_386_TLS_GOTIE: | |
3017 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3018 | case elfcpp::R_386_TLS_LE_32: | |
3019 | return 0; | |
3020 | ||
3021 | case elfcpp::R_386_32: | |
3022 | case elfcpp::R_386_PC32: | |
3023 | case elfcpp::R_386_GOT32: | |
3024 | case elfcpp::R_386_PLT32: | |
3025 | case elfcpp::R_386_GOTOFF: | |
3026 | case elfcpp::R_386_GOTPC: | |
3027 | return 4; | |
3028 | ||
3029 | case elfcpp::R_386_16: | |
3030 | case elfcpp::R_386_PC16: | |
3031 | return 2; | |
3032 | ||
3033 | case elfcpp::R_386_8: | |
3034 | case elfcpp::R_386_PC8: | |
3035 | return 1; | |
3036 | ||
3037 | // These are relocations which should only be seen by the | |
3038 | // dynamic linker, and should never be seen here. | |
3039 | case elfcpp::R_386_COPY: | |
3040 | case elfcpp::R_386_GLOB_DAT: | |
3041 | case elfcpp::R_386_JUMP_SLOT: | |
3042 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3043 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3044 | case elfcpp::R_386_TLS_TPOFF: |
3045 | case elfcpp::R_386_TLS_DTPMOD32: | |
3046 | case elfcpp::R_386_TLS_DTPOFF32: | |
3047 | case elfcpp::R_386_TLS_TPOFF32: | |
3048 | case elfcpp::R_386_TLS_DESC: | |
3049 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3050 | return 0; | |
3051 | ||
3052 | case elfcpp::R_386_32PLT: | |
3053 | case elfcpp::R_386_TLS_GD_32: | |
3054 | case elfcpp::R_386_TLS_GD_PUSH: | |
3055 | case elfcpp::R_386_TLS_GD_CALL: | |
3056 | case elfcpp::R_386_TLS_GD_POP: | |
3057 | case elfcpp::R_386_TLS_LDM_32: | |
3058 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3059 | case elfcpp::R_386_TLS_LDM_CALL: | |
3060 | case elfcpp::R_386_TLS_LDM_POP: | |
3061 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3062 | default: | |
3063 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3064 | return 0; | |
3065 | } | |
3066 | } | |
3067 | ||
3068 | // Scan the relocs during a relocatable link. | |
3069 | ||
3070 | void | |
ad0f2072 | 3071 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3072 | Layout* layout, |
6fa2a40b | 3073 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3074 | unsigned int data_shndx, |
3075 | unsigned int sh_type, | |
3076 | const unsigned char* prelocs, | |
3077 | size_t reloc_count, | |
3078 | Output_section* output_section, | |
3079 | bool needs_special_offset_handling, | |
3080 | size_t local_symbol_count, | |
3081 | const unsigned char* plocal_symbols, | |
3082 | Relocatable_relocs* rr) | |
3083 | { | |
3084 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3085 | ||
3086 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3087 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3088 | ||
7019cd25 | 3089 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3090 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3091 | symtab, |
3092 | layout, | |
3093 | object, | |
3094 | data_shndx, | |
3095 | prelocs, | |
3096 | reloc_count, | |
3097 | output_section, | |
3098 | needs_special_offset_handling, | |
3099 | local_symbol_count, | |
3100 | plocal_symbols, | |
3101 | rr); | |
3102 | } | |
3103 | ||
3104 | // Relocate a section during a relocatable link. | |
3105 | ||
3106 | void | |
3107 | Target_i386::relocate_for_relocatable( | |
3108 | const Relocate_info<32, false>* relinfo, | |
3109 | unsigned int sh_type, | |
3110 | const unsigned char* prelocs, | |
3111 | size_t reloc_count, | |
3112 | Output_section* output_section, | |
3113 | off_t offset_in_output_section, | |
3114 | const Relocatable_relocs* rr, | |
3115 | unsigned char* view, | |
3116 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3117 | section_size_type view_size, | |
3118 | unsigned char* reloc_view, | |
3119 | section_size_type reloc_view_size) | |
3120 | { | |
3121 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3122 | ||
7019cd25 | 3123 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3124 | relinfo, |
3125 | prelocs, | |
3126 | reloc_count, | |
3127 | output_section, | |
3128 | offset_in_output_section, | |
3129 | rr, | |
3130 | view, | |
3131 | view_address, | |
3132 | view_size, | |
3133 | reloc_view, | |
3134 | reloc_view_size); | |
3135 | } | |
3136 | ||
ab5c9e90 ILT |
3137 | // Return the value to use for a dynamic which requires special |
3138 | // treatment. This is how we support equality comparisons of function | |
3139 | // pointers across shared library boundaries, as described in the | |
3140 | // processor specific ABI supplement. | |
3141 | ||
3142 | uint64_t | |
3143 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3144 | { | |
3145 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3146 | return this->plt_section()->address() + gsym->plt_offset(); | |
3147 | } | |
3148 | ||
c51e6221 ILT |
3149 | // Return a string used to fill a code section with nops to take up |
3150 | // the specified length. | |
3151 | ||
3152 | std::string | |
8851ecca | 3153 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3154 | { |
3155 | if (length >= 16) | |
3156 | { | |
3157 | // Build a jmp instruction to skip over the bytes. | |
3158 | unsigned char jmp[5]; | |
3159 | jmp[0] = 0xe9; | |
3160 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3161 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3162 | + std::string(length - 5, '\0')); | |
3163 | } | |
3164 | ||
3165 | // Nop sequences of various lengths. | |
3166 | const char nop1[1] = { 0x90 }; // nop | |
3167 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3168 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3169 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3170 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3171 | 0x00 }; // leal 0(%esi,1),%esi | |
3172 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3173 | 0x00, 0x00 }; | |
3174 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3175 | 0x00, 0x00, 0x00 }; | |
3176 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3177 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3178 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3179 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3180 | 0x00 }; | |
3181 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3182 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3183 | 0x00, 0x00 }; | |
3184 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3185 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3186 | 0x00, 0x00, 0x00 }; | |
3187 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3188 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3189 | 0x00, 0x00, 0x00, 0x00 }; | |
3190 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3191 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3192 | 0x27, 0x00, 0x00, 0x00, | |
3193 | 0x00 }; | |
3194 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3195 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3196 | 0xbc, 0x27, 0x00, 0x00, | |
3197 | 0x00, 0x00 }; | |
3198 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3199 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3200 | 0x90, 0x90, 0x90, 0x90, | |
3201 | 0x90, 0x90, 0x90 }; | |
3202 | ||
3203 | const char* nops[16] = { | |
3204 | NULL, | |
3205 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3206 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3207 | }; | |
3208 | ||
3209 | return std::string(nops[length], length); | |
3210 | } | |
3211 | ||
b6848d3c ILT |
3212 | // Return whether SYM should be treated as a call to a non-split |
3213 | // function. We don't want that to be true of a call to a | |
3214 | // get_pc_thunk function. | |
3215 | ||
3216 | bool | |
3217 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3218 | { | |
3219 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3220 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3221 | } | |
3222 | ||
364c7fa5 | 3223 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3224 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3225 | // code. We have to change the function so that it always ensures |
3226 | // that it has enough stack space to run some random function. | |
3227 | ||
3228 | void | |
3229 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3230 | section_offset_type fnoffset, | |
3231 | section_size_type fnsize, | |
3232 | unsigned char* view, | |
3233 | section_size_type view_size, | |
3234 | std::string* from, | |
3235 | std::string* to) const | |
3236 | { | |
3237 | // The function starts with a comparison of the stack pointer and a | |
3238 | // field in the TCB. This is followed by a jump. | |
3239 | ||
3240 | // cmp %gs:NN,%esp | |
3241 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3242 | && fnsize > 7) | |
3243 | { | |
3244 | // We will call __morestack if the carry flag is set after this | |
3245 | // comparison. We turn the comparison into an stc instruction | |
3246 | // and some nops. | |
3247 | view[fnoffset] = '\xf9'; | |
3248 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3249 | } | |
3250 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3251 | // lea NN(%esp),%edx |
3252 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3253 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3254 | && fnsize > 7) |
3255 | { | |
3256 | // This is loading an offset from the stack pointer for a | |
3257 | // comparison. The offset is negative, so we decrease the | |
3258 | // offset by the amount of space we need for the stack. This | |
3259 | // means we will avoid calling __morestack if there happens to | |
3260 | // be plenty of space on the stack already. | |
3261 | unsigned char* pval = view + fnoffset + 3; | |
3262 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3263 | val -= parameters->options().split_stack_adjust_size(); | |
3264 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3265 | } | |
3266 | else | |
3267 | { | |
3268 | if (!object->has_no_split_stack()) | |
3269 | object->error(_("failed to match split-stack sequence at " | |
3270 | "section %u offset %0zx"), | |
ac33a407 | 3271 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3272 | return; |
3273 | } | |
3274 | ||
3275 | // We have to change the function so that it calls | |
3276 | // __morestack_non_split instead of __morestack. The former will | |
3277 | // allocate additional stack space. | |
3278 | *from = "__morestack"; | |
3279 | *to = "__morestack_non_split"; | |
3280 | } | |
3281 | ||
14bfc3f5 ILT |
3282 | // The selector for i386 object files. |
3283 | ||
36959681 | 3284 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3285 | { |
3286 | public: | |
3287 | Target_selector_i386() | |
36959681 ILT |
3288 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
3289 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
3290 | { } |
3291 | ||
3292 | Target* | |
e96caa79 ILT |
3293 | do_instantiate_target() |
3294 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3295 | }; |
3296 | ||
14bfc3f5 ILT |
3297 | Target_selector_i386 target_selector_i386; |
3298 | ||
3299 | } // End anonymous namespace. |