Commit | Line | Data |
---|---|---|
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 | ||
a3ad94ed ILT |
48 | class Output_data_plt_i386; |
49 | ||
14bfc3f5 | 50 | // The i386 target class. |
e041f13d ILT |
51 | // TLS info comes from |
52 | // http://people.redhat.com/drepper/tls.pdf | |
53 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 54 | |
36959681 | 55 | class Target_i386 : public Target_freebsd<32, false> |
14bfc3f5 ILT |
56 | { |
57 | public: | |
5a6f7e2d ILT |
58 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
59 | ||
14bfc3f5 | 60 | Target_i386() |
36959681 | 61 | : Target_freebsd<32, false>(&i386_info), |
a8df5856 ILT |
62 | got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL), |
63 | global_offset_table_(NULL), rel_dyn_(NULL), | |
64 | copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 65 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 66 | { } |
75f65a3e | 67 | |
0897ed3b ST |
68 | inline bool |
69 | can_check_for_function_pointers() const | |
70 | { return true; } | |
71 | ||
6d03d481 ST |
72 | // Process the relocations to determine unreferenced sections for |
73 | // garbage collection. | |
74 | void | |
ad0f2072 | 75 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
76 | Layout* layout, |
77 | Sized_relobj<32, false>* object, | |
78 | unsigned int data_shndx, | |
79 | unsigned int sh_type, | |
80 | const unsigned char* prelocs, | |
81 | size_t reloc_count, | |
82 | Output_section* output_section, | |
83 | bool needs_special_offset_handling, | |
84 | size_t local_symbol_count, | |
85 | const unsigned char* plocal_symbols); | |
86 | ||
92e059d8 | 87 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 88 | void |
ad0f2072 | 89 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 90 | Layout* layout, |
f6ce93d6 | 91 | Sized_relobj<32, false>* object, |
a3ad94ed | 92 | unsigned int data_shndx, |
92e059d8 ILT |
93 | unsigned int sh_type, |
94 | const unsigned char* prelocs, | |
95 | size_t reloc_count, | |
730cdc88 ILT |
96 | Output_section* output_section, |
97 | bool needs_special_offset_handling, | |
92e059d8 | 98 | size_t local_symbol_count, |
730cdc88 | 99 | const unsigned char* plocal_symbols); |
61ba1cf9 | 100 | |
5a6f7e2d ILT |
101 | // Finalize the sections. |
102 | void | |
f59f41f3 | 103 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 104 | |
ab5c9e90 ILT |
105 | // Return the value to use for a dynamic which requires special |
106 | // treatment. | |
107 | uint64_t | |
108 | do_dynsym_value(const Symbol*) const; | |
109 | ||
92e059d8 ILT |
110 | // Relocate a section. |
111 | void | |
112 | relocate_section(const Relocate_info<32, false>*, | |
113 | unsigned int sh_type, | |
114 | const unsigned char* prelocs, | |
115 | size_t reloc_count, | |
730cdc88 ILT |
116 | Output_section* output_section, |
117 | bool needs_special_offset_handling, | |
92e059d8 ILT |
118 | unsigned char* view, |
119 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
120 | section_size_type view_size, |
121 | const Reloc_symbol_changes*); | |
92e059d8 | 122 | |
6a74a719 ILT |
123 | // Scan the relocs during a relocatable link. |
124 | void | |
ad0f2072 | 125 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
126 | Layout* layout, |
127 | Sized_relobj<32, false>* object, | |
128 | unsigned int data_shndx, | |
129 | unsigned int sh_type, | |
130 | const unsigned char* prelocs, | |
131 | size_t reloc_count, | |
132 | Output_section* output_section, | |
133 | bool needs_special_offset_handling, | |
134 | size_t local_symbol_count, | |
135 | const unsigned char* plocal_symbols, | |
136 | Relocatable_relocs*); | |
137 | ||
138 | // Relocate a section during a relocatable link. | |
139 | void | |
140 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
141 | unsigned int sh_type, | |
142 | const unsigned char* prelocs, | |
143 | size_t reloc_count, | |
144 | Output_section* output_section, | |
145 | off_t offset_in_output_section, | |
146 | const Relocatable_relocs*, | |
147 | unsigned char* view, | |
148 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
149 | section_size_type view_size, | |
150 | unsigned char* reloc_view, | |
151 | section_size_type reloc_view_size); | |
152 | ||
c51e6221 ILT |
153 | // Return a string used to fill a code section with nops. |
154 | std::string | |
8851ecca | 155 | do_code_fill(section_size_type length) const; |
c51e6221 | 156 | |
9a2d6984 ILT |
157 | // Return whether SYM is defined by the ABI. |
158 | bool | |
9c2d0ef9 | 159 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
160 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
161 | ||
bb04269c DK |
162 | // Return whether a symbol name implies a local label. The UnixWare |
163 | // 2.1 cc generates temporary symbols that start with .X, so we | |
164 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
165 | // If so, we should move the .X recognition into | |
166 | // Target::do_is_local_label_name. | |
167 | bool | |
168 | do_is_local_label_name(const char* name) const | |
169 | { | |
170 | if (name[0] == '.' && name[1] == 'X') | |
171 | return true; | |
172 | return Target::do_is_local_label_name(name); | |
173 | } | |
174 | ||
b6848d3c ILT |
175 | // Return whether SYM is call to a non-split function. |
176 | bool | |
177 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
178 | ||
364c7fa5 ILT |
179 | // Adjust -fstack-split code which calls non-stack-split code. |
180 | void | |
181 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
182 | section_offset_type fnoffset, section_size_type fnsize, | |
183 | unsigned char* view, section_size_type view_size, | |
184 | std::string* from, std::string* to) const; | |
185 | ||
96f2030e | 186 | // Return the size of the GOT section. |
fe8718a4 | 187 | section_size_type |
0e70b911 | 188 | got_size() const |
96f2030e ILT |
189 | { |
190 | gold_assert(this->got_ != NULL); | |
191 | return this->got_->data_size(); | |
192 | } | |
193 | ||
0e70b911 CC |
194 | // Return the number of entries in the GOT. |
195 | unsigned int | |
196 | got_entry_count() const | |
197 | { | |
198 | if (this->got_ == NULL) | |
199 | return 0; | |
200 | return this->got_size() / 4; | |
201 | } | |
202 | ||
203 | // Return the number of entries in the PLT. | |
204 | unsigned int | |
205 | plt_entry_count() const; | |
206 | ||
207 | // Return the offset of the first non-reserved PLT entry. | |
208 | unsigned int | |
209 | first_plt_entry_offset() const; | |
210 | ||
211 | // Return the size of each PLT entry. | |
212 | unsigned int | |
213 | plt_entry_size() const; | |
214 | ||
92e059d8 ILT |
215 | private: |
216 | // The class which scans relocations. | |
217 | struct Scan | |
61ba1cf9 ILT |
218 | { |
219 | inline void | |
ad0f2072 | 220 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 221 | Sized_relobj<32, false>* object, |
a3ad94ed | 222 | unsigned int data_shndx, |
07f397ab | 223 | Output_section* output_section, |
92e059d8 ILT |
224 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
225 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 226 | |
92e059d8 | 227 | inline void |
ad0f2072 | 228 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 229 | Sized_relobj<32, false>* object, |
a3ad94ed | 230 | unsigned int data_shndx, |
07f397ab | 231 | Output_section* output_section, |
92e059d8 ILT |
232 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
233 | Symbol* gsym); | |
af6359d5 | 234 | |
21bb3914 | 235 | inline bool |
0897ed3b ST |
236 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
237 | Target_i386* target, | |
238 | Sized_relobj<32, false>* object, | |
239 | unsigned int data_shndx, | |
240 | Output_section* output_section, | |
241 | const elfcpp::Rel<32, false>& reloc, | |
242 | unsigned int r_type, | |
243 | const elfcpp::Sym<32, false>& lsym); | |
244 | ||
245 | inline bool | |
246 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
247 | Target_i386* target, | |
248 | Sized_relobj<32, false>* object, | |
249 | unsigned int data_shndx, | |
250 | Output_section* output_section, | |
251 | const elfcpp::Rel<32, false>& reloc, | |
252 | unsigned int r_type, | |
253 | Symbol* gsym); | |
21bb3914 ST |
254 | |
255 | inline bool | |
0897ed3b | 256 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 257 | |
af6359d5 ILT |
258 | static void |
259 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
260 | ||
261 | static void | |
262 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
263 | Symbol*); | |
61ba1cf9 ILT |
264 | }; |
265 | ||
92e059d8 ILT |
266 | // The class which implements relocation. |
267 | class Relocate | |
268 | { | |
269 | public: | |
ead1e424 | 270 | Relocate() |
46cf9fa2 | 271 | : skip_call_tls_get_addr_(false), |
82bb573a | 272 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
273 | { } |
274 | ||
275 | ~Relocate() | |
276 | { | |
277 | if (this->skip_call_tls_get_addr_) | |
278 | { | |
279 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 280 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
281 | } |
282 | } | |
283 | ||
86849f1f ILT |
284 | // Return whether the static relocation needs to be applied. |
285 | inline bool | |
286 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 287 | int ref_flags, |
031cdbed ILT |
288 | bool is_32bit, |
289 | Output_section* output_section); | |
86849f1f | 290 | |
ead1e424 ILT |
291 | // Do a relocation. Return false if the caller should not issue |
292 | // any warnings about this relocation. | |
293 | inline bool | |
031cdbed ILT |
294 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
295 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 296 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 297 | const Symbol_value<32>*, |
92e059d8 | 298 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 299 | section_size_type); |
92e059d8 ILT |
300 | |
301 | private: | |
302 | // Do a TLS relocation. | |
ead1e424 | 303 | inline void |
07f397ab ILT |
304 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
305 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 306 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 307 | const Symbol_value<32>*, |
fe8718a4 ILT |
308 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
309 | section_size_type); | |
92e059d8 | 310 | |
07f397ab ILT |
311 | // Do a TLS General-Dynamic to Initial-Exec transition. |
312 | inline void | |
313 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
314 | Output_segment* tls_segment, | |
315 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
316 | elfcpp::Elf_types<32>::Elf_Addr value, | |
317 | unsigned char* view, | |
fe8718a4 | 318 | section_size_type view_size); |
07f397ab | 319 | |
56622147 ILT |
320 | // Do a TLS General-Dynamic to Local-Exec transition. |
321 | inline void | |
322 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
323 | Output_segment* tls_segment, |
324 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
325 | elfcpp::Elf_types<32>::Elf_Addr value, | |
326 | unsigned char* view, | |
fe8718a4 | 327 | section_size_type view_size); |
92e059d8 | 328 | |
c2b45e22 CC |
329 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
330 | // transition. | |
331 | inline void | |
332 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
333 | Output_segment* tls_segment, | |
334 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
335 | elfcpp::Elf_types<32>::Elf_Addr value, | |
336 | unsigned char* view, | |
337 | section_size_type view_size); | |
338 | ||
339 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
340 | // transition. | |
341 | inline void | |
342 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
343 | Output_segment* tls_segment, | |
344 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
345 | elfcpp::Elf_types<32>::Elf_Addr value, | |
346 | unsigned char* view, | |
347 | section_size_type view_size); | |
348 | ||
56622147 | 349 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 350 | inline void |
56622147 | 351 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
352 | Output_segment* tls_segment, |
353 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
354 | elfcpp::Elf_types<32>::Elf_Addr value, | |
355 | unsigned char* view, | |
fe8718a4 | 356 | section_size_type view_size); |
ead1e424 | 357 | |
56622147 ILT |
358 | // Do a TLS Initial-Exec to Local-Exec transition. |
359 | static inline void | |
360 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
361 | Output_segment* tls_segment, |
362 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
363 | elfcpp::Elf_types<32>::Elf_Addr value, | |
364 | unsigned char* view, | |
fe8718a4 | 365 | section_size_type view_size); |
46cf9fa2 | 366 | |
46cf9fa2 ILT |
367 | // We need to keep track of which type of local dynamic relocation |
368 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
369 | enum Local_dynamic_type | |
370 | { | |
371 | LOCAL_DYNAMIC_NONE, | |
372 | LOCAL_DYNAMIC_SUN, | |
373 | LOCAL_DYNAMIC_GNU | |
374 | }; | |
375 | ||
ead1e424 ILT |
376 | // This is set if we should skip the next reloc, which should be a |
377 | // PLT32 reloc against ___tls_get_addr. | |
378 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
379 | // The type of local dynamic relocation we have seen in the section |
380 | // being relocated, if any. | |
381 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
382 | }; |
383 | ||
6a74a719 ILT |
384 | // A class which returns the size required for a relocation type, |
385 | // used while scanning relocs during a relocatable link. | |
386 | class Relocatable_size_for_reloc | |
387 | { | |
388 | public: | |
389 | unsigned int | |
390 | get_size_for_reloc(unsigned int, Relobj*); | |
391 | }; | |
392 | ||
92e059d8 ILT |
393 | // Adjust TLS relocation type based on the options and whether this |
394 | // is a local symbol. | |
af6359d5 | 395 | static tls::Tls_optimization |
7e1edb90 | 396 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 397 | |
ead1e424 | 398 | // Get the GOT section, creating it if necessary. |
dbe717ef | 399 | Output_data_got<32, false>* |
7e1edb90 | 400 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 401 | |
96f2030e ILT |
402 | // Get the GOT PLT section. |
403 | Output_data_space* | |
404 | got_plt_section() const | |
405 | { | |
406 | gold_assert(this->got_plt_ != NULL); | |
407 | return this->got_plt_; | |
408 | } | |
409 | ||
a8df5856 ILT |
410 | // Get the GOT section for TLSDESC entries. |
411 | Output_data_got<32, false>* | |
412 | got_tlsdesc_section() const | |
413 | { | |
414 | gold_assert(this->got_tlsdesc_ != NULL); | |
415 | return this->got_tlsdesc_; | |
416 | } | |
417 | ||
a3ad94ed ILT |
418 | // Create a PLT entry for a global symbol. |
419 | void | |
7e1edb90 | 420 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 421 | |
9fa33bee | 422 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
423 | void |
424 | define_tls_base_symbol(Symbol_table*, Layout*); | |
425 | ||
94c4710f ILT |
426 | // Create a GOT entry for the TLS module index. |
427 | unsigned int | |
428 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
429 | Sized_relobj<32, false>* object); | |
430 | ||
a3ad94ed | 431 | // Get the PLT section. |
e291e7b9 | 432 | Output_data_plt_i386* |
a3ad94ed ILT |
433 | plt_section() const |
434 | { | |
435 | gold_assert(this->plt_ != NULL); | |
436 | return this->plt_; | |
437 | } | |
438 | ||
5a6f7e2d ILT |
439 | // Get the dynamic reloc section, creating it if necessary. |
440 | Reloc_section* | |
441 | rel_dyn_section(Layout*); | |
442 | ||
e291e7b9 ILT |
443 | // Get the section to use for TLS_DESC relocations. |
444 | Reloc_section* | |
445 | rel_tls_desc_section(Layout*) const; | |
446 | ||
12c0daef | 447 | // Add a potential copy relocation. |
a3ad94ed | 448 | void |
ef9beddf ILT |
449 | copy_reloc(Symbol_table* symtab, Layout* layout, |
450 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
451 | unsigned int shndx, Output_section* output_section, |
452 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
453 | { | |
454 | this->copy_relocs_.copy_reloc(symtab, layout, | |
455 | symtab->get_sized_symbol<32>(sym), | |
456 | object, shndx, output_section, reloc, | |
457 | this->rel_dyn_section(layout)); | |
458 | } | |
ead1e424 | 459 | |
92e059d8 ILT |
460 | // Information about this specific target which we pass to the |
461 | // general Target structure. | |
75f65a3e | 462 | static const Target::Target_info i386_info; |
ead1e424 | 463 | |
0a65a3a7 | 464 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
465 | // These values are exposed to the ABI in an incremental link. |
466 | // Do not renumber existing values without changing the version | |
467 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
468 | enum Got_type |
469 | { | |
470 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
471 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
472 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
473 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
474 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
475 | }; |
476 | ||
ead1e424 | 477 | // The GOT section. |
dbe717ef | 478 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
479 | // The PLT section. |
480 | Output_data_plt_i386* plt_; | |
481 | // The GOT PLT section. | |
482 | Output_data_space* got_plt_; | |
a8df5856 ILT |
483 | // The GOT section for TLSDESC relocations. |
484 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
485 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
486 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
487 | // The dynamic reloc section. |
488 | Reloc_section* rel_dyn_; | |
489 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 490 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
491 | // Space for variables copied with a COPY reloc. |
492 | Output_data_space* dynbss_; | |
c2b45e22 | 493 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 494 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
495 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
496 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
497 | }; |
498 | ||
499 | const Target::Target_info Target_i386::i386_info = | |
500 | { | |
61ba1cf9 ILT |
501 | 32, // size |
502 | false, // is_big_endian | |
503 | elfcpp::EM_386, // machine_code | |
504 | false, // has_make_symbol | |
dbe717ef | 505 | false, // has_resolve |
c51e6221 | 506 | true, // has_code_fill |
35cdfc9a | 507 | true, // is_default_stack_executable |
0864d551 | 508 | '\0', // wrap_char |
dbe717ef | 509 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 510 | 0x08048000, // default_text_segment_address |
cd72c291 | 511 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
512 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
513 | elfcpp::SHN_UNDEF, // small_common_shndx | |
514 | elfcpp::SHN_UNDEF, // large_common_shndx | |
515 | 0, // small_common_section_flags | |
05a352e6 DK |
516 | 0, // large_common_section_flags |
517 | NULL, // attributes_section | |
518 | NULL // attributes_vendor | |
14bfc3f5 ILT |
519 | }; |
520 | ||
ead1e424 ILT |
521 | // Get the GOT section, creating it if necessary. |
522 | ||
dbe717ef | 523 | Output_data_got<32, false>* |
7e1edb90 | 524 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
525 | { |
526 | if (this->got_ == NULL) | |
527 | { | |
7e1edb90 | 528 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 529 | |
7e1edb90 | 530 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 531 | |
82742395 ILT |
532 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
533 | (elfcpp::SHF_ALLOC | |
534 | | elfcpp::SHF_WRITE), | |
22f0da72 | 535 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 536 | |
7d9e3d98 | 537 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
538 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
539 | (elfcpp::SHF_ALLOC | |
540 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
541 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
542 | false); | |
a3ad94ed | 543 | |
ead1e424 | 544 | // The first three entries are reserved. |
27bc2bce | 545 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 546 | |
1a2dff53 ILT |
547 | // Those bytes can go into the relro segment. |
548 | layout->increase_relro(3 * 4); | |
549 | ||
a3ad94ed | 550 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
551 | this->global_offset_table_ = |
552 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
553 | Symbol_table::PREDEFINED, | |
554 | this->got_plt_, | |
555 | 0, 0, elfcpp::STT_OBJECT, | |
556 | elfcpp::STB_LOCAL, | |
557 | elfcpp::STV_HIDDEN, 0, | |
558 | false, false); | |
a8df5856 ILT |
559 | |
560 | // If there are any TLSDESC relocations, they get GOT entries in | |
561 | // .got.plt after the jump slot entries. | |
562 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
563 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
564 | (elfcpp::SHF_ALLOC | |
565 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
566 | this->got_tlsdesc_, |
567 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 568 | } |
a3ad94ed | 569 | |
ead1e424 ILT |
570 | return this->got_; |
571 | } | |
572 | ||
5a6f7e2d ILT |
573 | // Get the dynamic reloc section, creating it if necessary. |
574 | ||
575 | Target_i386::Reloc_section* | |
576 | Target_i386::rel_dyn_section(Layout* layout) | |
577 | { | |
578 | if (this->rel_dyn_ == NULL) | |
579 | { | |
580 | gold_assert(layout != NULL); | |
d98bc257 | 581 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 582 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
583 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
584 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
585 | } |
586 | return this->rel_dyn_; | |
587 | } | |
588 | ||
a3ad94ed ILT |
589 | // A class to handle the PLT data. |
590 | ||
591 | class Output_data_plt_i386 : public Output_section_data | |
592 | { | |
593 | public: | |
594 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
595 | ||
7e1edb90 | 596 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
597 | |
598 | // Add an entry to the PLT. | |
599 | void | |
600 | add_entry(Symbol* gsym); | |
601 | ||
16649710 ILT |
602 | // Return the .rel.plt section data. |
603 | const Reloc_section* | |
604 | rel_plt() const | |
605 | { return this->rel_; } | |
606 | ||
e291e7b9 ILT |
607 | // Return where the TLS_DESC relocations should go. |
608 | Reloc_section* | |
609 | rel_tls_desc(Layout*); | |
610 | ||
0e70b911 CC |
611 | // Return the number of PLT entries. |
612 | unsigned int | |
613 | entry_count() const | |
614 | { return this->count_; } | |
615 | ||
616 | // Return the offset of the first non-reserved PLT entry. | |
617 | static unsigned int | |
618 | first_plt_entry_offset() | |
619 | { return plt_entry_size; } | |
620 | ||
621 | // Return the size of a PLT entry. | |
622 | static unsigned int | |
623 | get_plt_entry_size() | |
624 | { return plt_entry_size; } | |
625 | ||
16649710 ILT |
626 | protected: |
627 | void | |
628 | do_adjust_output_section(Output_section* os); | |
629 | ||
7d9e3d98 ILT |
630 | // Write to a map file. |
631 | void | |
632 | do_print_to_mapfile(Mapfile* mapfile) const | |
633 | { mapfile->print_output_data(this, _("** PLT")); } | |
634 | ||
a3ad94ed ILT |
635 | private: |
636 | // The size of an entry in the PLT. | |
637 | static const int plt_entry_size = 16; | |
638 | ||
639 | // The first entry in the PLT for an executable. | |
640 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
641 | ||
642 | // The first entry in the PLT for a shared object. | |
643 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
644 | ||
645 | // Other entries in the PLT for an executable. | |
646 | static unsigned char exec_plt_entry[plt_entry_size]; | |
647 | ||
648 | // Other entries in the PLT for a shared object. | |
649 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
650 | ||
651 | // Set the final size. | |
652 | void | |
27bc2bce | 653 | set_final_data_size() |
a3ad94ed ILT |
654 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
655 | ||
656 | // Write out the PLT data. | |
657 | void | |
658 | do_write(Output_file*); | |
659 | ||
660 | // The reloc section. | |
661 | Reloc_section* rel_; | |
e291e7b9 ILT |
662 | // The TLS_DESC relocations, if necessary. These must follow the |
663 | // regular PLT relocs. | |
664 | Reloc_section* tls_desc_rel_; | |
a3ad94ed ILT |
665 | // The .got.plt section. |
666 | Output_data_space* got_plt_; | |
667 | // The number of PLT entries. | |
668 | unsigned int count_; | |
a3ad94ed ILT |
669 | }; |
670 | ||
671 | // Create the PLT section. The ordinary .got section is an argument, | |
672 | // since we need to refer to the start. We also create our own .got | |
673 | // section just for PLT entries. | |
674 | ||
675 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 676 | Output_data_space* got_plt) |
e291e7b9 | 677 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0) |
a3ad94ed | 678 | { |
d98bc257 | 679 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 680 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
681 | elfcpp::SHF_ALLOC, this->rel_, |
682 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
a3ad94ed ILT |
683 | } |
684 | ||
16649710 ILT |
685 | void |
686 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
687 | { | |
688 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
689 | // linker, and so do we. | |
690 | os->set_entsize(4); | |
691 | } | |
692 | ||
a3ad94ed ILT |
693 | // Add an entry to the PLT. |
694 | ||
695 | void | |
696 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
697 | { | |
698 | gold_assert(!gsym->has_plt_offset()); | |
699 | ||
700 | // Note that when setting the PLT offset we skip the initial | |
701 | // reserved PLT entry. | |
702 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
703 | ||
704 | ++this->count_; | |
705 | ||
fe8718a4 | 706 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
707 | |
708 | // Every PLT entry needs a GOT entry which points back to the PLT | |
709 | // entry (this will be changed by the dynamic linker, normally | |
710 | // lazily when the function is called). | |
27bc2bce | 711 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
712 | |
713 | // Every PLT entry needs a reloc. | |
16649710 | 714 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
715 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
716 | got_offset); | |
717 | ||
718 | // Note that we don't need to save the symbol. The contents of the | |
719 | // PLT are independent of which symbols are used. The symbols only | |
720 | // appear in the relocations. | |
721 | } | |
722 | ||
e291e7b9 ILT |
723 | // Return where the TLS_DESC relocations should go, creating it if |
724 | // necessary. These follow the JUMP_SLOT relocations. | |
725 | ||
726 | Output_data_plt_i386::Reloc_section* | |
727 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
728 | { | |
729 | if (this->tls_desc_rel_ == NULL) | |
730 | { | |
731 | this->tls_desc_rel_ = new Reloc_section(false); | |
732 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
733 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 734 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
735 | gold_assert(this->tls_desc_rel_->output_section() == |
736 | this->rel_->output_section()); | |
737 | } | |
738 | return this->tls_desc_rel_; | |
739 | } | |
740 | ||
a3ad94ed ILT |
741 | // The first entry in the PLT for an executable. |
742 | ||
743 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
744 | { | |
745 | 0xff, 0x35, // pushl contents of memory address | |
746 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
747 | 0xff, 0x25, // jmp indirect | |
748 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
749 | 0, 0, 0, 0 // unused | |
750 | }; | |
751 | ||
752 | // The first entry in the PLT for a shared object. | |
753 | ||
754 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
755 | { | |
756 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
757 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
758 | 0, 0, 0, 0 // unused | |
759 | }; | |
760 | ||
761 | // Subsequent entries in the PLT for an executable. | |
762 | ||
763 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
764 | { | |
765 | 0xff, 0x25, // jmp indirect | |
766 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
767 | 0x68, // pushl immediate | |
768 | 0, 0, 0, 0, // replaced with offset into relocation table | |
769 | 0xe9, // jmp relative | |
770 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
771 | }; | |
772 | ||
773 | // Subsequent entries in the PLT for a shared object. | |
774 | ||
775 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
776 | { | |
777 | 0xff, 0xa3, // jmp *offset(%ebx) | |
778 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
779 | 0x68, // pushl immediate | |
780 | 0, 0, 0, 0, // replaced with offset into relocation table | |
781 | 0xe9, // jmp relative | |
782 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
783 | }; | |
784 | ||
785 | // Write out the PLT. This uses the hand-coded instructions above, | |
786 | // and adjusts them as needed. This is all specified by the i386 ELF | |
787 | // Processor Supplement. | |
788 | ||
789 | void | |
790 | Output_data_plt_i386::do_write(Output_file* of) | |
791 | { | |
2ea97941 | 792 | const off_t offset = this->offset(); |
fe8718a4 ILT |
793 | const section_size_type oview_size = |
794 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 795 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
796 | |
797 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
798 | const section_size_type got_size = |
799 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
800 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
801 | got_size); | |
802 | ||
803 | unsigned char* pov = oview; | |
804 | ||
805 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
806 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
807 | ||
374ad285 | 808 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
809 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
810 | else | |
811 | { | |
812 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
813 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
814 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
815 | } | |
816 | pov += plt_entry_size; | |
817 | ||
818 | unsigned char* got_pov = got_view; | |
819 | ||
820 | memset(got_pov, 0, 12); | |
821 | got_pov += 12; | |
822 | ||
823 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
824 | ||
825 | unsigned int plt_offset = plt_entry_size; | |
826 | unsigned int plt_rel_offset = 0; | |
827 | unsigned int got_offset = 12; | |
828 | const unsigned int count = this->count_; | |
829 | for (unsigned int i = 0; | |
830 | i < count; | |
831 | ++i, | |
832 | pov += plt_entry_size, | |
833 | got_pov += 4, | |
834 | plt_offset += plt_entry_size, | |
835 | plt_rel_offset += rel_size, | |
836 | got_offset += 4) | |
837 | { | |
838 | // Set and adjust the PLT entry itself. | |
839 | ||
374ad285 | 840 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
841 | { |
842 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
843 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
844 | } | |
845 | else | |
846 | { | |
847 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
848 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
849 | (got_address | |
850 | + got_offset)); | |
851 | } | |
852 | ||
853 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
854 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
855 | - (plt_offset + plt_entry_size)); | |
856 | ||
857 | // Set the entry in the GOT. | |
858 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
859 | } | |
860 | ||
fe8718a4 ILT |
861 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
862 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 863 | |
2ea97941 | 864 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
865 | of->write_output_view(got_file_offset, got_size, got_view); |
866 | } | |
867 | ||
868 | // Create a PLT entry for a global symbol. | |
869 | ||
870 | void | |
7e1edb90 | 871 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
872 | { |
873 | if (gsym->has_plt_offset()) | |
874 | return; | |
875 | ||
876 | if (this->plt_ == NULL) | |
877 | { | |
878 | // Create the GOT sections first. | |
7e1edb90 | 879 | this->got_section(symtab, layout); |
a3ad94ed | 880 | |
7e1edb90 | 881 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
882 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
883 | (elfcpp::SHF_ALLOC | |
884 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 885 | this->plt_, ORDER_PLT, false); |
a3ad94ed ILT |
886 | } |
887 | ||
888 | this->plt_->add_entry(gsym); | |
889 | } | |
890 | ||
0e70b911 CC |
891 | // Return the number of entries in the PLT. |
892 | ||
893 | unsigned int | |
894 | Target_i386::plt_entry_count() const | |
895 | { | |
896 | if (this->plt_ == NULL) | |
897 | return 0; | |
898 | return this->plt_->entry_count(); | |
899 | } | |
900 | ||
901 | // Return the offset of the first non-reserved PLT entry. | |
902 | ||
903 | unsigned int | |
904 | Target_i386::first_plt_entry_offset() const | |
905 | { | |
906 | return Output_data_plt_i386::first_plt_entry_offset(); | |
907 | } | |
908 | ||
909 | // Return the size of each PLT entry. | |
910 | ||
911 | unsigned int | |
912 | Target_i386::plt_entry_size() const | |
913 | { | |
914 | return Output_data_plt_i386::get_plt_entry_size(); | |
915 | } | |
916 | ||
e291e7b9 ILT |
917 | // Get the section to use for TLS_DESC relocations. |
918 | ||
919 | Target_i386::Reloc_section* | |
920 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
921 | { | |
922 | return this->plt_section()->rel_tls_desc(layout); | |
923 | } | |
924 | ||
9fa33bee | 925 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
926 | |
927 | void | |
928 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
929 | { | |
930 | if (this->tls_base_symbol_defined_) | |
931 | return; | |
932 | ||
933 | Output_segment* tls_segment = layout->tls_segment(); | |
934 | if (tls_segment != NULL) | |
935 | { | |
183fd0e3 | 936 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 937 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 938 | Symbol_table::PREDEFINED, |
edfbb029 CC |
939 | tls_segment, 0, 0, |
940 | elfcpp::STT_TLS, | |
941 | elfcpp::STB_LOCAL, | |
942 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
943 | (is_exec |
944 | ? Symbol::SEGMENT_END | |
945 | : Symbol::SEGMENT_START), | |
946 | true); | |
edfbb029 CC |
947 | } |
948 | this->tls_base_symbol_defined_ = true; | |
949 | } | |
950 | ||
94c4710f ILT |
951 | // Create a GOT entry for the TLS module index. |
952 | ||
953 | unsigned int | |
954 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
955 | Sized_relobj<32, false>* object) | |
956 | { | |
957 | if (this->got_mod_index_offset_ == -1U) | |
958 | { | |
959 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
960 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
961 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
962 | unsigned int got_offset = got->add_constant(0); | |
963 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
964 | got_offset); | |
009a67a2 | 965 | got->add_constant(0); |
94c4710f ILT |
966 | this->got_mod_index_offset_ = got_offset; |
967 | } | |
968 | return this->got_mod_index_offset_; | |
969 | } | |
970 | ||
92e059d8 | 971 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
972 | // symbol. IS_FINAL is true if the final address of this symbol is |
973 | // known at link time. | |
92e059d8 | 974 | |
af6359d5 | 975 | tls::Tls_optimization |
7e1edb90 | 976 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
977 | { |
978 | // If we are generating a shared library, then we can't do anything | |
979 | // in the linker. | |
8851ecca | 980 | if (parameters->options().shared()) |
af6359d5 | 981 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
982 | |
983 | switch (r_type) | |
984 | { | |
985 | case elfcpp::R_386_TLS_GD: | |
986 | case elfcpp::R_386_TLS_GOTDESC: | |
987 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 988 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
989 | // access. Since we know that we are generating an executable, |
990 | // we can convert this to Initial-Exec. If we also know that | |
991 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 992 | if (is_final) |
af6359d5 ILT |
993 | return tls::TLSOPT_TO_LE; |
994 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
995 | |
996 | case elfcpp::R_386_TLS_LDM: | |
997 | // This is Local-Dynamic, which refers to a local symbol in the | |
998 | // dynamic TLS block. Since we know that we generating an | |
999 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1000 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1001 | |
1002 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1003 | // Another type of Local-Dynamic relocation. |
1004 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1005 | |
1006 | case elfcpp::R_386_TLS_IE: | |
1007 | case elfcpp::R_386_TLS_GOTIE: | |
1008 | case elfcpp::R_386_TLS_IE_32: | |
1009 | // These are Initial-Exec relocs which get the thread offset | |
1010 | // from the GOT. If we know that we are linking against the | |
1011 | // local symbol, we can switch to Local-Exec, which links the | |
1012 | // thread offset into the instruction. | |
a3ad94ed | 1013 | if (is_final) |
af6359d5 ILT |
1014 | return tls::TLSOPT_TO_LE; |
1015 | return tls::TLSOPT_NONE; | |
8462ae85 | 1016 | |
92e059d8 ILT |
1017 | case elfcpp::R_386_TLS_LE: |
1018 | case elfcpp::R_386_TLS_LE_32: | |
1019 | // When we already have Local-Exec, there is nothing further we | |
1020 | // can do. | |
af6359d5 | 1021 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1022 | |
1023 | default: | |
a3ad94ed | 1024 | gold_unreachable(); |
92e059d8 ILT |
1025 | } |
1026 | } | |
1027 | ||
af6359d5 ILT |
1028 | // Report an unsupported relocation against a local symbol. |
1029 | ||
1030 | void | |
1031 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
1032 | unsigned int r_type) | |
1033 | { | |
75f2446e ILT |
1034 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1035 | object->name().c_str(), r_type); | |
af6359d5 ILT |
1036 | } |
1037 | ||
92e059d8 ILT |
1038 | // Scan a relocation for a local symbol. |
1039 | ||
1040 | inline void | |
ad0f2072 | 1041 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1042 | Layout* layout, |
1043 | Target_i386* target, | |
f6ce93d6 | 1044 | Sized_relobj<32, false>* object, |
1b64748b | 1045 | unsigned int data_shndx, |
07f397ab | 1046 | Output_section* output_section, |
1b64748b | 1047 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1048 | unsigned int r_type, |
7bf1f802 | 1049 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
1050 | { |
1051 | switch (r_type) | |
1052 | { | |
1053 | case elfcpp::R_386_NONE: | |
1054 | case elfcpp::R_386_GNU_VTINHERIT: | |
1055 | case elfcpp::R_386_GNU_VTENTRY: | |
1056 | break; | |
1057 | ||
1058 | case elfcpp::R_386_32: | |
436ca963 ILT |
1059 | // If building a shared library (or a position-independent |
1060 | // executable), we need to create a dynamic relocation for | |
1061 | // this location. The relocation applied at link time will | |
1062 | // apply the link-time value, so we flag the location with | |
1063 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1064 | // relocate it easily. | |
8851ecca | 1065 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1066 | { |
1067 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1068 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1069 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
1070 | output_section, data_shndx, | |
1071 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1072 | } |
1073 | break; | |
1074 | ||
1075 | case elfcpp::R_386_16: | |
1076 | case elfcpp::R_386_8: | |
1077 | // If building a shared library (or a position-independent | |
1078 | // executable), we need to create a dynamic relocation for | |
1079 | // this location. Because the addend needs to remain in the | |
1080 | // data section, we need to be careful not to apply this | |
1081 | // relocation statically. | |
8851ecca | 1082 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1083 | { |
1084 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1085 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1086 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1087 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1088 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1089 | else |
1090 | { | |
1091 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1092 | unsigned int shndx = lsym.get_st_shndx(); |
1093 | bool is_ordinary; | |
1094 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1095 | &is_ordinary); | |
1096 | if (!is_ordinary) | |
1097 | object->error(_("section symbol %u has bad shndx %u"), | |
1098 | r_sym, shndx); | |
1099 | else | |
1100 | rel_dyn->add_local_section(object, shndx, | |
1101 | r_type, output_section, | |
1102 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1103 | } |
436ca963 | 1104 | } |
92e059d8 ILT |
1105 | break; |
1106 | ||
1107 | case elfcpp::R_386_PC32: | |
1108 | case elfcpp::R_386_PC16: | |
1109 | case elfcpp::R_386_PC8: | |
1110 | break; | |
1111 | ||
df2efe71 ILT |
1112 | case elfcpp::R_386_PLT32: |
1113 | // Since we know this is a local symbol, we can handle this as a | |
1114 | // PC32 reloc. | |
1115 | break; | |
1116 | ||
ead1e424 ILT |
1117 | case elfcpp::R_386_GOTOFF: |
1118 | case elfcpp::R_386_GOTPC: | |
1119 | // We need a GOT section. | |
7e1edb90 | 1120 | target->got_section(symtab, layout); |
ead1e424 ILT |
1121 | break; |
1122 | ||
1b64748b ILT |
1123 | case elfcpp::R_386_GOT32: |
1124 | { | |
1125 | // The symbol requires a GOT entry. | |
1126 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1127 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 1128 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
1129 | { |
1130 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1131 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1132 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1133 | { |
1134 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2ea97941 | 1135 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
1136 | rel_dyn->add_local_relative( |
1137 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
1138 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
1139 | } |
1140 | } | |
1141 | } | |
1142 | break; | |
1143 | ||
af6359d5 ILT |
1144 | // These are relocations which should only be seen by the |
1145 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1146 | case elfcpp::R_386_COPY: |
1147 | case elfcpp::R_386_GLOB_DAT: | |
1148 | case elfcpp::R_386_JUMP_SLOT: | |
1149 | case elfcpp::R_386_RELATIVE: | |
1150 | case elfcpp::R_386_TLS_TPOFF: | |
1151 | case elfcpp::R_386_TLS_DTPMOD32: | |
1152 | case elfcpp::R_386_TLS_DTPOFF32: | |
1153 | case elfcpp::R_386_TLS_TPOFF32: | |
1154 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1155 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1156 | object->name().c_str(), r_type); |
92e059d8 ILT |
1157 | break; |
1158 | ||
af6359d5 | 1159 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1160 | // linking. |
56622147 ILT |
1161 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1162 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1163 | case elfcpp::R_386_TLS_DESC_CALL: | |
1164 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1165 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1166 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1167 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1168 | case elfcpp::R_386_TLS_GOTIE: |
1169 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1170 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1171 | { |
8851ecca | 1172 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1173 | const tls::Tls_optimization optimized_type |
1174 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1175 | switch (r_type) |
1176 | { | |
56622147 | 1177 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1178 | if (optimized_type == tls::TLSOPT_NONE) |
1179 | { | |
1180 | // Create a pair of GOT entries for the module index and | |
1181 | // dtv-relative offset. | |
1182 | Output_data_got<32, false>* got | |
1183 | = target->got_section(symtab, layout); | |
1184 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1185 | unsigned int shndx = lsym.get_st_shndx(); |
1186 | bool is_ordinary; | |
1187 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1188 | if (!is_ordinary) | |
1189 | object->error(_("local symbol %u has bad shndx %u"), | |
1190 | r_sym, shndx); | |
1191 | else | |
1192 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1193 | GOT_TYPE_TLS_PAIR, | |
1194 | target->rel_dyn_section(layout), | |
1195 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1196 | } |
1197 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1198 | unsupported_reloc_local(object, r_type); | |
1199 | break; | |
1200 | ||
56622147 | 1201 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1202 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1203 | if (optimized_type == tls::TLSOPT_NONE) |
1204 | { | |
a8df5856 ILT |
1205 | // Create a double GOT entry with an R_386_TLS_DESC |
1206 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1207 | // lazily, so the GOT entry needs to be in an area in | |
1208 | // .got.plt, not .got. Call got_section to make sure | |
1209 | // the section has been created. | |
1210 | target->got_section(symtab, layout); | |
1211 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1212 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1213 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1214 | { | |
1215 | unsigned int got_offset = got->add_constant(0); | |
1216 | // The local symbol value is stored in the second | |
1217 | // GOT entry. | |
1218 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1219 | // That set the GOT offset of the local symbol to | |
1220 | // point to the second entry, but we want it to | |
1221 | // point to the first. | |
1222 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1223 | got_offset); | |
1224 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1225 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1226 | } | |
c2b45e22 CC |
1227 | } |
1228 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1229 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1230 | break; |
1231 | ||
c2b45e22 CC |
1232 | case elfcpp::R_386_TLS_DESC_CALL: |
1233 | break; | |
1234 | ||
56622147 | 1235 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1236 | if (optimized_type == tls::TLSOPT_NONE) |
1237 | { | |
1238 | // Create a GOT entry for the module index. | |
94c4710f | 1239 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1240 | } |
1241 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1242 | unsupported_reloc_local(object, r_type); |
1243 | break; | |
1244 | ||
56622147 | 1245 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1246 | break; |
1247 | ||
56622147 ILT |
1248 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1249 | case elfcpp::R_386_TLS_IE_32: | |
1250 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1251 | layout->set_has_static_tls(); |
07f397ab ILT |
1252 | if (optimized_type == tls::TLSOPT_NONE) |
1253 | { | |
7bf1f802 ILT |
1254 | // For the R_386_TLS_IE relocation, we need to create a |
1255 | // dynamic relocation when building a shared library. | |
1256 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1257 | && parameters->options().shared()) |
7bf1f802 ILT |
1258 | { |
1259 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1260 | unsigned int r_sym |
1261 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1262 | rel_dyn->add_local_relative(object, r_sym, | |
1263 | elfcpp::R_386_RELATIVE, | |
1264 | output_section, data_shndx, | |
1265 | reloc.get_r_offset()); | |
7bf1f802 | 1266 | } |
07f397ab ILT |
1267 | // Create a GOT entry for the tp-relative offset. |
1268 | Output_data_got<32, false>* got | |
1269 | = target->got_section(symtab, layout); | |
1270 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1271 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1272 | ? elfcpp::R_386_TLS_TPOFF32 | |
1273 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1274 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1275 | ? GOT_TYPE_TLS_OFFSET | |
1276 | : GOT_TYPE_TLS_NOFFSET); | |
1277 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1278 | target->rel_dyn_section(layout), |
1279 | dyn_r_type); | |
07f397ab ILT |
1280 | } |
1281 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1282 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1283 | break; |
af6359d5 | 1284 | |
56622147 ILT |
1285 | case elfcpp::R_386_TLS_LE: // Local-exec |
1286 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1287 | layout->set_has_static_tls(); |
07f397ab | 1288 | if (output_is_shared) |
7bf1f802 ILT |
1289 | { |
1290 | // We need to create a dynamic relocation. | |
dceae3c1 | 1291 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1292 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1293 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1294 | ? elfcpp::R_386_TLS_TPOFF32 | |
1295 | : elfcpp::R_386_TLS_TPOFF); | |
1296 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1297 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1298 | data_shndx, reloc.get_r_offset()); | |
1299 | } | |
56622147 ILT |
1300 | break; |
1301 | ||
af6359d5 ILT |
1302 | default: |
1303 | gold_unreachable(); | |
7e1edb90 ILT |
1304 | } |
1305 | } | |
92e059d8 ILT |
1306 | break; |
1307 | ||
92e059d8 ILT |
1308 | case elfcpp::R_386_32PLT: |
1309 | case elfcpp::R_386_TLS_GD_32: | |
1310 | case elfcpp::R_386_TLS_GD_PUSH: | |
1311 | case elfcpp::R_386_TLS_GD_CALL: | |
1312 | case elfcpp::R_386_TLS_GD_POP: | |
1313 | case elfcpp::R_386_TLS_LDM_32: | |
1314 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1315 | case elfcpp::R_386_TLS_LDM_CALL: | |
1316 | case elfcpp::R_386_TLS_LDM_POP: | |
1317 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1318 | default: | |
af6359d5 | 1319 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1320 | break; |
1321 | } | |
1322 | } | |
1323 | ||
af6359d5 ILT |
1324 | // Report an unsupported relocation against a global symbol. |
1325 | ||
1326 | void | |
1327 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1328 | unsigned int r_type, | |
1329 | Symbol* gsym) | |
1330 | { | |
75f2446e | 1331 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1332 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1333 | } |
1334 | ||
0897ed3b ST |
1335 | inline bool |
1336 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1337 | { | |
1338 | switch (r_type) | |
1339 | { | |
1340 | case elfcpp::R_386_32: | |
1341 | case elfcpp::R_386_16: | |
1342 | case elfcpp::R_386_8: | |
1343 | case elfcpp::R_386_GOTOFF: | |
1344 | case elfcpp::R_386_GOT32: | |
1345 | { | |
1346 | return true; | |
1347 | } | |
1348 | default: | |
1349 | return false; | |
1350 | } | |
1351 | return false; | |
1352 | } | |
1353 | ||
1354 | inline bool | |
1355 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1356 | Symbol_table* , | |
1357 | Layout* , | |
1358 | Target_i386* , | |
1359 | Sized_relobj<32, false>* , | |
1360 | unsigned int , | |
1361 | Output_section* , | |
1362 | const elfcpp::Rel<32, false>& , | |
1363 | unsigned int r_type, | |
1364 | const elfcpp::Sym<32, false>&) | |
1365 | { | |
1366 | return possible_function_pointer_reloc(r_type); | |
1367 | } | |
1368 | ||
1369 | inline bool | |
1370 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1371 | Symbol_table* , | |
1372 | Layout* , | |
1373 | Target_i386* , | |
1374 | Sized_relobj<32, false>* , | |
1375 | unsigned int , | |
1376 | Output_section* , | |
1377 | const elfcpp::Rel<32, false>& , | |
1378 | unsigned int r_type, | |
1379 | Symbol*) | |
1380 | { | |
1381 | return possible_function_pointer_reloc(r_type); | |
1382 | } | |
1383 | ||
92e059d8 ILT |
1384 | // Scan a relocation for a global symbol. |
1385 | ||
1386 | inline void | |
ad0f2072 | 1387 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1388 | Layout* layout, |
1389 | Target_i386* target, | |
f6ce93d6 | 1390 | Sized_relobj<32, false>* object, |
a3ad94ed | 1391 | unsigned int data_shndx, |
07f397ab | 1392 | Output_section* output_section, |
a3ad94ed ILT |
1393 | const elfcpp::Rel<32, false>& reloc, |
1394 | unsigned int r_type, | |
92e059d8 ILT |
1395 | Symbol* gsym) |
1396 | { | |
1397 | switch (r_type) | |
1398 | { | |
1399 | case elfcpp::R_386_NONE: | |
1400 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1401 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1402 | break; |
1403 | ||
1404 | case elfcpp::R_386_32: | |
92e059d8 | 1405 | case elfcpp::R_386_16: |
92e059d8 | 1406 | case elfcpp::R_386_8: |
96f2030e | 1407 | { |
d61c6bd4 ILT |
1408 | // Make a PLT entry if necessary. |
1409 | if (gsym->needs_plt_entry()) | |
1410 | { | |
1411 | target->make_plt_entry(symtab, layout, gsym); | |
1412 | // Since this is not a PC-relative relocation, we may be | |
1413 | // taking the address of a function. In that case we need to | |
1414 | // set the entry in the dynamic symbol table to the address of | |
1415 | // the PLT entry. | |
8851ecca | 1416 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1417 | gsym->set_needs_dynsym_value(); |
1418 | } | |
1419 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1420 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1421 | { |
966d4097 | 1422 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1423 | { |
12c0daef | 1424 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1425 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1426 | } |
1427 | else if (r_type == elfcpp::R_386_32 | |
1428 | && gsym->can_use_relative_reloc(false)) | |
1429 | { | |
1430 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1431 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1432 | output_section, object, | |
1433 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1434 | } |
1435 | else | |
1436 | { | |
96f2030e | 1437 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1438 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1439 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1440 | } |
1441 | } | |
1442 | } | |
1443 | break; | |
1444 | ||
1445 | case elfcpp::R_386_PC32: | |
1446 | case elfcpp::R_386_PC16: | |
1447 | case elfcpp::R_386_PC8: | |
1448 | { | |
1449 | // Make a PLT entry if necessary. | |
1450 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1451 | { |
1452 | // These relocations are used for function calls only in | |
1453 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1454 | // we'll need a text relocation anyway, so we can skip the | |
1455 | // PLT entry and let the dynamic linker bind the call directly | |
1456 | // to the target. For smaller relocations, we should use a | |
1457 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1458 | if (!parameters->options().shared() |
7bf1f802 ILT |
1459 | || r_type != elfcpp::R_386_PC32) |
1460 | target->make_plt_entry(symtab, layout, gsym); | |
1461 | } | |
d61c6bd4 | 1462 | // Make a dynamic relocation if necessary. |
0700cf32 | 1463 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1464 | if (gsym->is_func()) |
0700cf32 ILT |
1465 | flags |= Symbol::FUNCTION_CALL; |
1466 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1467 | { |
966d4097 | 1468 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1469 | { |
12c0daef | 1470 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1471 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1472 | } |
86849f1f | 1473 | else |
d61c6bd4 ILT |
1474 | { |
1475 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1476 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1477 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1478 | } |
96f2030e ILT |
1479 | } |
1480 | } | |
92e059d8 ILT |
1481 | break; |
1482 | ||
ead1e424 | 1483 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1484 | { |
1485 | // The symbol requires a GOT entry. | |
7e1edb90 | 1486 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1487 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1488 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1489 | else |
1490 | { | |
8462ae85 | 1491 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1492 | // GOT entry with a dynamic relocation. |
1493 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1494 | if (gsym->is_from_dynobj() |
1495 | || gsym->is_undefined() | |
1496 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1497 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1498 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1499 | else |
8462ae85 | 1500 | { |
0a65a3a7 CC |
1501 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1502 | rel_dyn->add_global_relative( | |
1503 | gsym, elfcpp::R_386_RELATIVE, got, | |
1504 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1505 | } |
1506 | } | |
1507 | } | |
ead1e424 ILT |
1508 | break; |
1509 | ||
1510 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1511 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1512 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1513 | if (gsym->final_value_is_known()) |
ead1e424 | 1514 | break; |
436ca963 ILT |
1515 | // If building a shared library, we can also skip the PLT entry |
1516 | // if the symbol is defined in the output file and is protected | |
1517 | // or hidden. | |
1518 | if (gsym->is_defined() | |
1519 | && !gsym->is_from_dynobj() | |
1520 | && !gsym->is_preemptible()) | |
1521 | break; | |
7e1edb90 | 1522 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1523 | break; |
1524 | ||
1525 | case elfcpp::R_386_GOTOFF: | |
1526 | case elfcpp::R_386_GOTPC: | |
1527 | // We need a GOT section. | |
7e1edb90 | 1528 | target->got_section(symtab, layout); |
ead1e424 ILT |
1529 | break; |
1530 | ||
af6359d5 ILT |
1531 | // These are relocations which should only be seen by the |
1532 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1533 | case elfcpp::R_386_COPY: |
1534 | case elfcpp::R_386_GLOB_DAT: | |
1535 | case elfcpp::R_386_JUMP_SLOT: | |
1536 | case elfcpp::R_386_RELATIVE: | |
1537 | case elfcpp::R_386_TLS_TPOFF: | |
1538 | case elfcpp::R_386_TLS_DTPMOD32: | |
1539 | case elfcpp::R_386_TLS_DTPOFF32: | |
1540 | case elfcpp::R_386_TLS_TPOFF32: | |
1541 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1542 | gold_error(_("%s: unexpected reloc %u in object file"), |
1543 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1544 | break; |
1545 | ||
d61c17ea ILT |
1546 | // These are initial tls relocs, which are expected when |
1547 | // linking. | |
56622147 ILT |
1548 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1549 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1550 | case elfcpp::R_386_TLS_DESC_CALL: | |
1551 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1552 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1553 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1554 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1555 | case elfcpp::R_386_TLS_GOTIE: |
1556 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1557 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1558 | { |
7e1edb90 | 1559 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1560 | const tls::Tls_optimization optimized_type |
1561 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1562 | switch (r_type) |
1563 | { | |
56622147 | 1564 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1565 | if (optimized_type == tls::TLSOPT_NONE) |
1566 | { | |
1567 | // Create a pair of GOT entries for the module index and | |
1568 | // dtv-relative offset. | |
1569 | Output_data_got<32, false>* got | |
1570 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1571 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1572 | target->rel_dyn_section(layout), |
1573 | elfcpp::R_386_TLS_DTPMOD32, | |
1574 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1575 | } |
1576 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1577 | { | |
1578 | // Create a GOT entry for the tp-relative offset. | |
1579 | Output_data_got<32, false>* got | |
1580 | = target->got_section(symtab, layout); | |
c2b45e22 | 1581 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1582 | target->rel_dyn_section(layout), |
c2b45e22 | 1583 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1584 | } |
1585 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1586 | unsupported_reloc_global(object, r_type, gsym); | |
1587 | break; | |
1588 | ||
56622147 | 1589 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1590 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1591 | if (optimized_type == tls::TLSOPT_NONE) |
1592 | { | |
a8df5856 ILT |
1593 | // Create a double GOT entry with an R_386_TLS_DESC |
1594 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1595 | // lazily, so the GOT entry needs to be in an area in | |
1596 | // .got.plt, not .got. Call got_section to make sure | |
1597 | // the section has been created. | |
1598 | target->got_section(symtab, layout); | |
1599 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1600 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1601 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1602 | elfcpp::R_386_TLS_DESC, 0); |
1603 | } | |
1604 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1605 | { | |
1606 | // Create a GOT entry for the tp-relative offset. | |
1607 | Output_data_got<32, false>* got | |
1608 | = target->got_section(symtab, layout); | |
1609 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1610 | target->rel_dyn_section(layout), | |
1611 | elfcpp::R_386_TLS_TPOFF); | |
1612 | } | |
1613 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1614 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1615 | break; |
1616 | ||
1617 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1618 | break; |
1619 | ||
56622147 | 1620 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1621 | if (optimized_type == tls::TLSOPT_NONE) |
1622 | { | |
1623 | // Create a GOT entry for the module index. | |
94c4710f | 1624 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1625 | } |
1626 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1627 | unsupported_reloc_global(object, r_type, gsym); |
1628 | break; | |
1629 | ||
56622147 | 1630 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1631 | break; |
1632 | ||
56622147 ILT |
1633 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1634 | case elfcpp::R_386_TLS_IE_32: | |
1635 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1636 | layout->set_has_static_tls(); |
07f397ab ILT |
1637 | if (optimized_type == tls::TLSOPT_NONE) |
1638 | { | |
7bf1f802 ILT |
1639 | // For the R_386_TLS_IE relocation, we need to create a |
1640 | // dynamic relocation when building a shared library. | |
1641 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1642 | && parameters->options().shared()) |
07f397ab | 1643 | { |
07f397ab | 1644 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1645 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1646 | output_section, object, | |
1647 | data_shndx, | |
1648 | reloc.get_r_offset()); | |
07f397ab | 1649 | } |
7bf1f802 ILT |
1650 | // Create a GOT entry for the tp-relative offset. |
1651 | Output_data_got<32, false>* got | |
1652 | = target->got_section(symtab, layout); | |
1653 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1654 | ? elfcpp::R_386_TLS_TPOFF32 | |
1655 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1656 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1657 | ? GOT_TYPE_TLS_OFFSET | |
1658 | : GOT_TYPE_TLS_NOFFSET); | |
1659 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1660 | target->rel_dyn_section(layout), |
1661 | dyn_r_type); | |
07f397ab ILT |
1662 | } |
1663 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1664 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1665 | break; |
af6359d5 | 1666 | |
56622147 ILT |
1667 | case elfcpp::R_386_TLS_LE: // Local-exec |
1668 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1669 | layout->set_has_static_tls(); |
8851ecca | 1670 | if (parameters->options().shared()) |
7bf1f802 ILT |
1671 | { |
1672 | // We need to create a dynamic relocation. | |
1673 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1674 | ? elfcpp::R_386_TLS_TPOFF32 | |
1675 | : elfcpp::R_386_TLS_TPOFF); | |
1676 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1677 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1678 | data_shndx, reloc.get_r_offset()); | |
1679 | } | |
56622147 ILT |
1680 | break; |
1681 | ||
af6359d5 ILT |
1682 | default: |
1683 | gold_unreachable(); | |
a3ad94ed ILT |
1684 | } |
1685 | } | |
92e059d8 ILT |
1686 | break; |
1687 | ||
92e059d8 ILT |
1688 | case elfcpp::R_386_32PLT: |
1689 | case elfcpp::R_386_TLS_GD_32: | |
1690 | case elfcpp::R_386_TLS_GD_PUSH: | |
1691 | case elfcpp::R_386_TLS_GD_CALL: | |
1692 | case elfcpp::R_386_TLS_GD_POP: | |
1693 | case elfcpp::R_386_TLS_LDM_32: | |
1694 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1695 | case elfcpp::R_386_TLS_LDM_CALL: | |
1696 | case elfcpp::R_386_TLS_LDM_POP: | |
1697 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1698 | default: | |
af6359d5 | 1699 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1700 | break; |
1701 | } | |
1702 | } | |
1703 | ||
6d03d481 ST |
1704 | // Process relocations for gc. |
1705 | ||
1706 | void | |
ad0f2072 | 1707 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1708 | Layout* layout, |
1709 | Sized_relobj<32, false>* object, | |
1710 | unsigned int data_shndx, | |
1711 | unsigned int, | |
1712 | const unsigned char* prelocs, | |
1713 | size_t reloc_count, | |
1714 | Output_section* output_section, | |
1715 | bool needs_special_offset_handling, | |
1716 | size_t local_symbol_count, | |
1717 | const unsigned char* plocal_symbols) | |
1718 | { | |
1719 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
1720 | Target_i386::Scan, |
1721 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
1722 | symtab, |
1723 | layout, | |
1724 | this, | |
1725 | object, | |
1726 | data_shndx, | |
1727 | prelocs, | |
1728 | reloc_count, | |
1729 | output_section, | |
1730 | needs_special_offset_handling, | |
1731 | local_symbol_count, | |
1732 | plocal_symbols); | |
1733 | } | |
1734 | ||
92e059d8 ILT |
1735 | // Scan relocations for a section. |
1736 | ||
1737 | void | |
ad0f2072 | 1738 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 1739 | Layout* layout, |
f6ce93d6 | 1740 | Sized_relobj<32, false>* object, |
a3ad94ed | 1741 | unsigned int data_shndx, |
92e059d8 ILT |
1742 | unsigned int sh_type, |
1743 | const unsigned char* prelocs, | |
1744 | size_t reloc_count, | |
730cdc88 ILT |
1745 | Output_section* output_section, |
1746 | bool needs_special_offset_handling, | |
92e059d8 | 1747 | size_t local_symbol_count, |
730cdc88 | 1748 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1749 | { |
1750 | if (sh_type == elfcpp::SHT_RELA) | |
1751 | { | |
75f2446e ILT |
1752 | gold_error(_("%s: unsupported RELA reloc section"), |
1753 | object->name().c_str()); | |
1754 | return; | |
92e059d8 ILT |
1755 | } |
1756 | ||
ead1e424 ILT |
1757 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1758 | Target_i386::Scan>( | |
92e059d8 | 1759 | symtab, |
ead1e424 ILT |
1760 | layout, |
1761 | this, | |
92e059d8 | 1762 | object, |
a3ad94ed | 1763 | data_shndx, |
92e059d8 ILT |
1764 | prelocs, |
1765 | reloc_count, | |
730cdc88 ILT |
1766 | output_section, |
1767 | needs_special_offset_handling, | |
92e059d8 | 1768 | local_symbol_count, |
730cdc88 | 1769 | plocal_symbols); |
92e059d8 ILT |
1770 | } |
1771 | ||
16649710 | 1772 | // Finalize the sections. |
5a6f7e2d ILT |
1773 | |
1774 | void | |
f59f41f3 DK |
1775 | Target_i386::do_finalize_sections( |
1776 | Layout* layout, | |
1777 | const Input_objects*, | |
e785ec03 | 1778 | Symbol_table* symtab) |
5a6f7e2d | 1779 | { |
ea715a34 ILT |
1780 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1781 | ? NULL | |
1782 | : this->plt_->rel_plt()); | |
1783 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 1784 | this->rel_dyn_, true, false); |
16649710 ILT |
1785 | |
1786 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1787 | // relocs. | |
12c0daef ILT |
1788 | if (this->copy_relocs_.any_saved_relocs()) |
1789 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
1790 | |
1791 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
1792 | // the .got.plt section. | |
1793 | Symbol* sym = this->global_offset_table_; | |
1794 | if (sym != NULL) | |
1795 | { | |
1796 | uint32_t data_size = this->got_plt_->current_data_size(); | |
1797 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
1798 | } | |
5a6f7e2d ILT |
1799 | } |
1800 | ||
86849f1f ILT |
1801 | // Return whether a direct absolute static relocation needs to be applied. |
1802 | // In cases where Scan::local() or Scan::global() has created | |
1803 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1804 | // of the relocation is carried in the data, and we must not | |
1805 | // apply the static relocation. | |
1806 | ||
1807 | inline bool | |
1808 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1809 | int ref_flags, |
031cdbed ILT |
1810 | bool is_32bit, |
1811 | Output_section* output_section) | |
86849f1f | 1812 | { |
031cdbed ILT |
1813 | // If the output section is not allocated, then we didn't call |
1814 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1815 | // the reloc here. | |
1816 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1817 | return true; | |
1818 | ||
d61c6bd4 ILT |
1819 | // For local symbols, we will have created a non-RELATIVE dynamic |
1820 | // relocation only if (a) the output is position independent, | |
1821 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1822 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1823 | if (gsym == NULL) |
8851ecca | 1824 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1825 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1826 | && !is_32bit); |
86849f1f | 1827 | |
0700cf32 ILT |
1828 | // For global symbols, we use the same helper routines used in the |
1829 | // scan pass. If we did not create a dynamic relocation, or if we | |
1830 | // created a RELATIVE dynamic relocation, we should apply the static | |
1831 | // relocation. | |
1832 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1833 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1834 | && gsym->can_use_relative_reloc(ref_flags | |
1835 | & Symbol::FUNCTION_CALL); | |
1836 | return !has_dyn || is_rel; | |
86849f1f ILT |
1837 | } |
1838 | ||
61ba1cf9 ILT |
1839 | // Perform a relocation. |
1840 | ||
ead1e424 | 1841 | inline bool |
92e059d8 | 1842 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1843 | Target_i386* target, |
031cdbed | 1844 | Output_section *output_section, |
92e059d8 ILT |
1845 | size_t relnum, |
1846 | const elfcpp::Rel<32, false>& rel, | |
1847 | unsigned int r_type, | |
c06b7b0b | 1848 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1849 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1850 | unsigned char* view, |
1851 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1852 | section_size_type view_size) |
61ba1cf9 | 1853 | { |
ead1e424 ILT |
1854 | if (this->skip_call_tls_get_addr_) |
1855 | { | |
5efc7cd2 CC |
1856 | if ((r_type != elfcpp::R_386_PLT32 |
1857 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1858 | || gsym == NULL |
1859 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1860 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1861 | _("missing expected TLS relocation")); | |
1862 | else | |
ead1e424 | 1863 | { |
75f2446e ILT |
1864 | this->skip_call_tls_get_addr_ = false; |
1865 | return false; | |
ead1e424 | 1866 | } |
ead1e424 ILT |
1867 | } |
1868 | ||
a3ad94ed | 1869 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1870 | Symbol_value<32> symval; |
436ca963 | 1871 | if (gsym != NULL |
de4c45bd ILT |
1872 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1873 | || r_type == elfcpp::R_386_PC16 | |
1874 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1875 | { |
b8e6aad9 ILT |
1876 | symval.set_output_value(target->plt_section()->address() |
1877 | + gsym->plt_offset()); | |
1878 | psymval = &symval; | |
a3ad94ed ILT |
1879 | } |
1880 | ||
b8e6aad9 ILT |
1881 | const Sized_relobj<32, false>* object = relinfo->object; |
1882 | ||
1b64748b | 1883 | // Get the GOT offset if needed. |
96f2030e ILT |
1884 | // The GOT pointer points to the end of the GOT section. |
1885 | // We need to subtract the size of the GOT section to get | |
1886 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1887 | bool have_got_offset = false; |
1888 | unsigned int got_offset = 0; | |
1889 | switch (r_type) | |
1890 | { | |
1891 | case elfcpp::R_386_GOT32: | |
1892 | if (gsym != NULL) | |
1893 | { | |
0a65a3a7 CC |
1894 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1895 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1896 | - target->got_size()); | |
1b64748b ILT |
1897 | } |
1898 | else | |
1899 | { | |
1900 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1901 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1902 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1903 | - target->got_size()); | |
1b64748b ILT |
1904 | } |
1905 | have_got_offset = true; | |
1906 | break; | |
1907 | ||
1908 | default: | |
1909 | break; | |
1910 | } | |
1911 | ||
61ba1cf9 ILT |
1912 | switch (r_type) |
1913 | { | |
1914 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1915 | case elfcpp::R_386_GNU_VTINHERIT: |
1916 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1917 | break; |
1918 | ||
1919 | case elfcpp::R_386_32: | |
031cdbed ILT |
1920 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1921 | output_section)) | |
86849f1f | 1922 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1923 | break; |
1924 | ||
1925 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1926 | { |
0700cf32 | 1927 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1928 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1929 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1930 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1931 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1932 | } | |
92e059d8 ILT |
1933 | break; |
1934 | ||
1935 | case elfcpp::R_386_16: | |
031cdbed ILT |
1936 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1937 | output_section)) | |
86849f1f | 1938 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1939 | break; |
1940 | ||
1941 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1942 | { |
0700cf32 | 1943 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1944 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1945 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1946 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1947 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1948 | } |
61ba1cf9 ILT |
1949 | break; |
1950 | ||
92e059d8 | 1951 | case elfcpp::R_386_8: |
031cdbed ILT |
1952 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1953 | output_section)) | |
86849f1f | 1954 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1955 | break; |
1956 | ||
1957 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1958 | { |
0700cf32 | 1959 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1960 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1961 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed ILT |
1962 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1963 | output_section)) | |
d09e9154 | 1964 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1965 | } |
92e059d8 ILT |
1966 | break; |
1967 | ||
ead1e424 | 1968 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1969 | gold_assert(gsym == NULL |
1970 | || gsym->has_plt_offset() | |
99f8faca ILT |
1971 | || gsym->final_value_is_known() |
1972 | || (gsym->is_defined() | |
1973 | && !gsym->is_from_dynobj() | |
1974 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1975 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1976 | break; |
1977 | ||
1978 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1979 | gold_assert(have_got_offset); |
1980 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1981 | break; |
1982 | ||
1983 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1984 | { |
1985 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1986 | value = (psymval->value(object, 0) | |
96f2030e | 1987 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1988 | Relocate_functions<32, false>::rel32(view, value); |
1989 | } | |
ead1e424 ILT |
1990 | break; |
1991 | ||
1992 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1993 | { |
1994 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1995 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1996 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1997 | } | |
ead1e424 ILT |
1998 | break; |
1999 | ||
92e059d8 ILT |
2000 | case elfcpp::R_386_COPY: |
2001 | case elfcpp::R_386_GLOB_DAT: | |
2002 | case elfcpp::R_386_JUMP_SLOT: | |
2003 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
2004 | // These are outstanding tls relocs, which are unexpected when |
2005 | // linking. | |
92e059d8 ILT |
2006 | case elfcpp::R_386_TLS_TPOFF: |
2007 | case elfcpp::R_386_TLS_DTPMOD32: | |
2008 | case elfcpp::R_386_TLS_DTPOFF32: | |
2009 | case elfcpp::R_386_TLS_TPOFF32: | |
2010 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2011 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2012 | _("unexpected reloc %u in object file"), | |
2013 | r_type); | |
92e059d8 ILT |
2014 | break; |
2015 | ||
d61c17ea ILT |
2016 | // These are initial tls relocs, which are expected when |
2017 | // linking. | |
56622147 ILT |
2018 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2019 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2020 | case elfcpp::R_386_TLS_DESC_CALL: | |
2021 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2022 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2023 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2024 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2025 | case elfcpp::R_386_TLS_GOTIE: |
2026 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2027 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2028 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2029 | view, address, view_size); | |
92e059d8 ILT |
2030 | break; |
2031 | ||
92e059d8 ILT |
2032 | case elfcpp::R_386_32PLT: |
2033 | case elfcpp::R_386_TLS_GD_32: | |
2034 | case elfcpp::R_386_TLS_GD_PUSH: | |
2035 | case elfcpp::R_386_TLS_GD_CALL: | |
2036 | case elfcpp::R_386_TLS_GD_POP: | |
2037 | case elfcpp::R_386_TLS_LDM_32: | |
2038 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2039 | case elfcpp::R_386_TLS_LDM_CALL: | |
2040 | case elfcpp::R_386_TLS_LDM_POP: | |
2041 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2042 | default: |
75f2446e ILT |
2043 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2044 | _("unsupported reloc %u"), | |
2045 | r_type); | |
92e059d8 ILT |
2046 | break; |
2047 | } | |
ead1e424 ILT |
2048 | |
2049 | return true; | |
92e059d8 ILT |
2050 | } |
2051 | ||
2052 | // Perform a TLS relocation. | |
2053 | ||
2054 | inline void | |
2055 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2056 | Target_i386* target, |
92e059d8 ILT |
2057 | size_t relnum, |
2058 | const elfcpp::Rel<32, false>& rel, | |
2059 | unsigned int r_type, | |
c06b7b0b | 2060 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2061 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2062 | unsigned char* view, |
2063 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2064 | section_size_type view_size) |
92e059d8 ILT |
2065 | { |
2066 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2067 | |
07f397ab ILT |
2068 | const Sized_relobj<32, false>* object = relinfo->object; |
2069 | ||
2070 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2071 | |
b3705d2a ILT |
2072 | const bool is_final = (gsym == NULL |
2073 | ? !parameters->options().shared() | |
2074 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2075 | const tls::Tls_optimization optimized_type |
2076 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2077 | switch (r_type) |
2078 | { | |
56622147 | 2079 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2080 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2081 | { |
07f397ab | 2082 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2083 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2084 | rel, r_type, value, view, | |
2085 | view_size); | |
92e059d8 ILT |
2086 | break; |
2087 | } | |
07f397ab ILT |
2088 | else |
2089 | { | |
c2b45e22 CC |
2090 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2091 | ? GOT_TYPE_TLS_NOFFSET | |
2092 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2093 | unsigned int got_offset; |
2094 | if (gsym != NULL) | |
2095 | { | |
c2b45e22 CC |
2096 | gold_assert(gsym->has_got_offset(got_type)); |
2097 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2098 | } |
2099 | else | |
2100 | { | |
2101 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2102 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2103 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2104 | - target->got_size()); |
2105 | } | |
2106 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2107 | { | |
2108 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2109 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2110 | got_offset, view, view_size); | |
07f397ab ILT |
2111 | break; |
2112 | } | |
2113 | else if (optimized_type == tls::TLSOPT_NONE) | |
2114 | { | |
2115 | // Relocate the field with the offset of the pair of GOT | |
2116 | // entries. | |
2117 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2118 | break; | |
2119 | } | |
2120 | } | |
75f2446e ILT |
2121 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2122 | _("unsupported reloc %u"), | |
2123 | r_type); | |
92e059d8 ILT |
2124 | break; |
2125 | ||
56622147 ILT |
2126 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2127 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2128 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2129 | if (optimized_type == tls::TLSOPT_TO_LE) |
2130 | { | |
2131 | gold_assert(tls_segment != NULL); | |
2132 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2133 | rel, r_type, value, view, | |
2134 | view_size); | |
2135 | break; | |
2136 | } | |
2137 | else | |
2138 | { | |
2139 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2140 | ? GOT_TYPE_TLS_NOFFSET | |
2141 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2142 | unsigned int got_offset = 0; |
2143 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2144 | && optimized_type == tls::TLSOPT_NONE) | |
2145 | { | |
2146 | // We created GOT entries in the .got.tlsdesc portion of | |
2147 | // the .got.plt section, but the offset stored in the | |
2148 | // symbol is the offset within .got.tlsdesc. | |
2149 | got_offset = (target->got_size() | |
2150 | + target->got_plt_section()->data_size()); | |
2151 | } | |
c2b45e22 CC |
2152 | if (gsym != NULL) |
2153 | { | |
2154 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2155 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2156 | } |
2157 | else | |
2158 | { | |
2159 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2160 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2161 | got_offset += (object->local_got_offset(r_sym, got_type) |
2162 | - target->got_size()); | |
c2b45e22 CC |
2163 | } |
2164 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2165 | { | |
2166 | gold_assert(tls_segment != NULL); | |
2167 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2168 | got_offset, view, view_size); | |
2169 | break; | |
2170 | } | |
2171 | else if (optimized_type == tls::TLSOPT_NONE) | |
2172 | { | |
2173 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2174 | { | |
2175 | // Relocate the field with the offset of the pair of GOT | |
2176 | // entries. | |
2177 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2178 | } | |
2179 | break; | |
2180 | } | |
2181 | } | |
75f2446e ILT |
2182 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2183 | _("unsupported reloc %u"), | |
2184 | r_type); | |
ead1e424 ILT |
2185 | break; |
2186 | ||
56622147 | 2187 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2188 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2189 | { | |
75f2446e ILT |
2190 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2191 | _("both SUN and GNU model " | |
2192 | "TLS relocations")); | |
2193 | break; | |
46cf9fa2 ILT |
2194 | } |
2195 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2196 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2197 | { |
07f397ab | 2198 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2199 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2200 | value, view, view_size); | |
2201 | break; | |
2202 | } | |
07f397ab ILT |
2203 | else if (optimized_type == tls::TLSOPT_NONE) |
2204 | { | |
2205 | // Relocate the field with the offset of the GOT entry for | |
2206 | // the module index. | |
2207 | unsigned int got_offset; | |
94c4710f ILT |
2208 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2209 | - target->got_size()); | |
07f397ab ILT |
2210 | Relocate_functions<32, false>::rel32(view, got_offset); |
2211 | break; | |
2212 | } | |
75f2446e ILT |
2213 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2214 | _("unsupported reloc %u"), | |
2215 | r_type); | |
46cf9fa2 ILT |
2216 | break; |
2217 | ||
56622147 | 2218 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2219 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2220 | { |
82bb573a ILT |
2221 | // This reloc can appear in debugging sections, in which |
2222 | // case we must not convert to local-exec. We decide what | |
2223 | // to do based on whether the section is marked as | |
2224 | // containing executable code. That is what the GNU linker | |
2225 | // does as well. | |
2226 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2227 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2228 | { |
2229 | gold_assert(tls_segment != NULL); | |
2230 | value -= tls_segment->memsz(); | |
2231 | } | |
e8a9fcda | 2232 | } |
46cf9fa2 ILT |
2233 | Relocate_functions<32, false>::rel32(view, value); |
2234 | break; | |
2235 | ||
56622147 ILT |
2236 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2237 | case elfcpp::R_386_TLS_GOTIE: | |
2238 | case elfcpp::R_386_TLS_IE_32: | |
2239 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2240 | { | |
07f397ab | 2241 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2242 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2243 | rel, r_type, value, view, | |
2244 | view_size); | |
2245 | break; | |
2246 | } | |
07f397ab ILT |
2247 | else if (optimized_type == tls::TLSOPT_NONE) |
2248 | { | |
2249 | // Relocate the field with the offset of the GOT entry for | |
2250 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2251 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2252 | ? GOT_TYPE_TLS_OFFSET | |
2253 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2254 | unsigned int got_offset; |
2255 | if (gsym != NULL) | |
2256 | { | |
c2b45e22 CC |
2257 | gold_assert(gsym->has_got_offset(got_type)); |
2258 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2259 | } |
2260 | else | |
2261 | { | |
2262 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2263 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2264 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2265 | } |
2266 | // For the R_386_TLS_IE relocation, we need to apply the | |
2267 | // absolute address of the GOT entry. | |
2268 | if (r_type == elfcpp::R_386_TLS_IE) | |
2269 | got_offset += target->got_plt_section()->address(); | |
2270 | // All GOT offsets are relative to the end of the GOT. | |
2271 | got_offset -= target->got_size(); | |
2272 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2273 | break; | |
2274 | } | |
75f2446e ILT |
2275 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2276 | _("unsupported reloc %u"), | |
2277 | r_type); | |
92e059d8 | 2278 | break; |
92e059d8 | 2279 | |
56622147 | 2280 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2281 | // If we're creating a shared library, a dynamic relocation will |
2282 | // have been created for this location, so do not apply it now. | |
8851ecca | 2283 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2284 | { |
2285 | gold_assert(tls_segment != NULL); | |
2286 | value -= tls_segment->memsz(); | |
2287 | Relocate_functions<32, false>::rel32(view, value); | |
2288 | } | |
56622147 | 2289 | break; |
92e059d8 | 2290 | |
56622147 | 2291 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2292 | // If we're creating a shared library, a dynamic relocation will |
2293 | // have been created for this location, so do not apply it now. | |
8851ecca | 2294 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2295 | { |
2296 | gold_assert(tls_segment != NULL); | |
2297 | value = tls_segment->memsz() - value; | |
2298 | Relocate_functions<32, false>::rel32(view, value); | |
2299 | } | |
56622147 | 2300 | break; |
92e059d8 | 2301 | } |
92e059d8 ILT |
2302 | } |
2303 | ||
e041f13d | 2304 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2305 | // Local-Exec. |
2306 | ||
2307 | inline void | |
2308 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2309 | size_t relnum, | |
2310 | Output_segment* tls_segment, | |
2311 | const elfcpp::Rel<32, false>& rel, | |
2312 | unsigned int, | |
2313 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2314 | unsigned char* view, | |
fe8718a4 | 2315 | section_size_type view_size) |
ead1e424 ILT |
2316 | { |
2317 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2318 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2319 | // leal foo(%reg),%eax; call ___tls_get_addr |
2320 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2321 | ||
af6359d5 ILT |
2322 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2323 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2324 | |
2325 | unsigned char op1 = view[-1]; | |
2326 | unsigned char op2 = view[-2]; | |
2327 | ||
af6359d5 ILT |
2328 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2329 | op2 == 0x8d || op2 == 0x04); | |
2330 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2331 | |
2332 | int roff = 5; | |
2333 | ||
2334 | if (op2 == 0x04) | |
2335 | { | |
af6359d5 ILT |
2336 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2337 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2338 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2339 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2340 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2341 | } | |
2342 | else | |
2343 | { | |
af6359d5 ILT |
2344 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2345 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2346 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2347 | && view[9] == 0x90) |
ead1e424 ILT |
2348 | { |
2349 | // There is a trailing nop. Use the size byte subl. | |
2350 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2351 | roff = 6; | |
2352 | } | |
2353 | else | |
2354 | { | |
2355 | // Use the five byte subl. | |
2356 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2357 | } | |
2358 | } | |
2359 | ||
7bf1f802 | 2360 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2361 | Relocate_functions<32, false>::rel32(view + roff, value); |
2362 | ||
2363 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2364 | // We can skip it. | |
2365 | this->skip_call_tls_get_addr_ = true; | |
2366 | } | |
2367 | ||
7bf1f802 | 2368 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2369 | // Initial-Exec. |
2370 | ||
2371 | inline void | |
2372 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2373 | size_t relnum, | |
c2b45e22 | 2374 | Output_segment*, |
07f397ab ILT |
2375 | const elfcpp::Rel<32, false>& rel, |
2376 | unsigned int, | |
2377 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2378 | unsigned char* view, | |
fe8718a4 | 2379 | section_size_type view_size) |
07f397ab ILT |
2380 | { |
2381 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2382 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2383 | ||
2384 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2385 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2386 | ||
2387 | unsigned char op1 = view[-1]; | |
2388 | unsigned char op2 = view[-2]; | |
2389 | ||
2390 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2391 | op2 == 0x8d || op2 == 0x04); | |
2392 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2393 | ||
2394 | int roff = 5; | |
2395 | ||
c2b45e22 CC |
2396 | // FIXME: For now, support only the first (SIB) form. |
2397 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2398 | |
2399 | if (op2 == 0x04) | |
2400 | { | |
2401 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2402 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2403 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2404 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2405 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2406 | } | |
2407 | else | |
2408 | { | |
2409 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2410 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2411 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2412 | && view[9] == 0x90) |
2413 | { | |
2414 | // FIXME: This is not the right instruction sequence. | |
2415 | // There is a trailing nop. Use the size byte subl. | |
2416 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2417 | roff = 6; | |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | // FIXME: This is not the right instruction sequence. | |
2422 | // Use the five byte subl. | |
2423 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2424 | } | |
2425 | } | |
2426 | ||
07f397ab ILT |
2427 | Relocate_functions<32, false>::rel32(view + roff, value); |
2428 | ||
2429 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2430 | // We can skip it. | |
2431 | this->skip_call_tls_get_addr_ = true; | |
2432 | } | |
2433 | ||
c2b45e22 CC |
2434 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2435 | // General-Dynamic to a Local-Exec. | |
2436 | ||
2437 | inline void | |
2438 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2439 | const Relocate_info<32, false>* relinfo, | |
2440 | size_t relnum, | |
2441 | Output_segment* tls_segment, | |
2442 | const elfcpp::Rel<32, false>& rel, | |
2443 | unsigned int r_type, | |
2444 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2445 | unsigned char* view, | |
2446 | section_size_type view_size) | |
2447 | { | |
2448 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2449 | { | |
2450 | // leal foo@TLSDESC(%ebx), %eax | |
2451 | // ==> leal foo@NTPOFF, %eax | |
2452 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2453 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2454 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2455 | view[-2] == 0x8d && view[-1] == 0x83); | |
2456 | view[-1] = 0x05; | |
2457 | value -= tls_segment->memsz(); | |
2458 | Relocate_functions<32, false>::rel32(view, value); | |
2459 | } | |
2460 | else | |
2461 | { | |
2462 | // call *foo@TLSCALL(%eax) | |
2463 | // ==> nop; nop | |
2464 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2465 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2466 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2467 | view[0] == 0xff && view[1] == 0x10); | |
2468 | view[0] = 0x66; | |
2469 | view[1] = 0x90; | |
2470 | } | |
2471 | } | |
2472 | ||
2473 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2474 | // General-Dynamic to an Initial-Exec. | |
2475 | ||
2476 | inline void | |
2477 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2478 | const Relocate_info<32, false>* relinfo, | |
2479 | size_t relnum, | |
2480 | Output_segment*, | |
2481 | const elfcpp::Rel<32, false>& rel, | |
2482 | unsigned int r_type, | |
2483 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2484 | unsigned char* view, | |
2485 | section_size_type view_size) | |
2486 | { | |
2487 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2488 | { | |
2489 | // leal foo@TLSDESC(%ebx), %eax | |
2490 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2491 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2492 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2493 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2494 | view[-2] == 0x8d && view[-1] == 0x83); | |
2495 | view[-2] = 0x8b; | |
2496 | Relocate_functions<32, false>::rel32(view, value); | |
2497 | } | |
2498 | else | |
2499 | { | |
2500 | // call *foo@TLSCALL(%eax) | |
2501 | // ==> nop; nop | |
2502 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2503 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2504 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2505 | view[0] == 0xff && view[1] == 0x10); | |
2506 | view[0] = 0x66; | |
2507 | view[1] = 0x90; | |
2508 | } | |
2509 | } | |
2510 | ||
46cf9fa2 ILT |
2511 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2512 | // Local-Exec. | |
2513 | ||
2514 | inline void | |
2515 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2516 | size_t relnum, | |
2517 | Output_segment*, | |
2518 | const elfcpp::Rel<32, false>& rel, | |
2519 | unsigned int, | |
2520 | elfcpp::Elf_types<32>::Elf_Addr, | |
2521 | unsigned char* view, | |
fe8718a4 | 2522 | section_size_type view_size) |
46cf9fa2 ILT |
2523 | { |
2524 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2525 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2526 | ||
af6359d5 ILT |
2527 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2528 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2529 | |
2530 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2531 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2532 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2533 | |
af6359d5 | 2534 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2535 | |
2536 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2537 | ||
2538 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2539 | // We can skip it. | |
2540 | this->skip_call_tls_get_addr_ = true; | |
2541 | } | |
2542 | ||
56622147 ILT |
2543 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2544 | // Local-Exec. | |
2545 | ||
2546 | inline void | |
2547 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2548 | size_t relnum, | |
2549 | Output_segment* tls_segment, | |
2550 | const elfcpp::Rel<32, false>& rel, | |
2551 | unsigned int r_type, | |
2552 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2553 | unsigned char* view, | |
fe8718a4 | 2554 | section_size_type view_size) |
56622147 ILT |
2555 | { |
2556 | // We have to actually change the instructions, which means that we | |
2557 | // need to examine the opcodes to figure out which instruction we | |
2558 | // are looking at. | |
2559 | if (r_type == elfcpp::R_386_TLS_IE) | |
2560 | { | |
2561 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2562 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2563 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2564 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2565 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2566 | ||
2567 | unsigned char op1 = view[-1]; | |
2568 | if (op1 == 0xa1) | |
2569 | { | |
2570 | // movl XX,%eax ==> movl $YY,%eax | |
2571 | view[-1] = 0xb8; | |
2572 | } | |
2573 | else | |
2574 | { | |
2575 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2576 | ||
2577 | unsigned char op2 = view[-2]; | |
2578 | if (op2 == 0x8b) | |
2579 | { | |
2580 | // movl XX,%reg ==> movl $YY,%reg | |
2581 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2582 | (op1 & 0xc7) == 0x05); | |
2583 | view[-2] = 0xc7; | |
2584 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2585 | } | |
2586 | else if (op2 == 0x03) | |
2587 | { | |
2588 | // addl XX,%reg ==> addl $YY,%reg | |
2589 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2590 | (op1 & 0xc7) == 0x05); | |
2591 | view[-2] = 0x81; | |
2592 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2593 | } | |
2594 | else | |
2595 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2596 | } | |
2597 | } | |
2598 | else | |
2599 | { | |
2600 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2601 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2602 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2603 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2604 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2605 | ||
2606 | unsigned char op1 = view[-1]; | |
2607 | unsigned char op2 = view[-2]; | |
2608 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2609 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2610 | if (op2 == 0x8b) | |
2611 | { | |
2612 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2613 | view[-2] = 0xc7; | |
2614 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2615 | } | |
2616 | else if (op2 == 0x2b) | |
2617 | { | |
2618 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2619 | view[-2] = 0x81; | |
2620 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2621 | } | |
2622 | else if (op2 == 0x03) | |
2623 | { | |
2624 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2625 | view[-2] = 0x81; | |
2626 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2627 | } | |
2628 | else | |
2629 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2630 | } | |
2631 | ||
7bf1f802 | 2632 | value = tls_segment->memsz() - value; |
56622147 ILT |
2633 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2634 | value = - value; | |
2635 | ||
2636 | Relocate_functions<32, false>::rel32(view, value); | |
2637 | } | |
2638 | ||
61ba1cf9 ILT |
2639 | // Relocate section data. |
2640 | ||
2641 | void | |
92e059d8 | 2642 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2643 | unsigned int sh_type, |
2644 | const unsigned char* prelocs, | |
2645 | size_t reloc_count, | |
730cdc88 ILT |
2646 | Output_section* output_section, |
2647 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2648 | unsigned char* view, |
2649 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2650 | section_size_type view_size, |
2651 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2652 | { |
a3ad94ed | 2653 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2654 | |
ead1e424 ILT |
2655 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2656 | Target_i386::Relocate>( | |
92e059d8 | 2657 | relinfo, |
ead1e424 | 2658 | this, |
61ba1cf9 ILT |
2659 | prelocs, |
2660 | reloc_count, | |
730cdc88 ILT |
2661 | output_section, |
2662 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2663 | view, |
2664 | address, | |
364c7fa5 ILT |
2665 | view_size, |
2666 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2667 | } |
2668 | ||
6a74a719 ILT |
2669 | // Return the size of a relocation while scanning during a relocatable |
2670 | // link. | |
2671 | ||
2672 | unsigned int | |
2673 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2674 | unsigned int r_type, | |
2675 | Relobj* object) | |
2676 | { | |
2677 | switch (r_type) | |
2678 | { | |
2679 | case elfcpp::R_386_NONE: | |
2680 | case elfcpp::R_386_GNU_VTINHERIT: | |
2681 | case elfcpp::R_386_GNU_VTENTRY: | |
2682 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2683 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2684 | case elfcpp::R_386_TLS_DESC_CALL: | |
2685 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2686 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2687 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2688 | case elfcpp::R_386_TLS_IE_32: | |
2689 | case elfcpp::R_386_TLS_GOTIE: | |
2690 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2691 | case elfcpp::R_386_TLS_LE_32: | |
2692 | return 0; | |
2693 | ||
2694 | case elfcpp::R_386_32: | |
2695 | case elfcpp::R_386_PC32: | |
2696 | case elfcpp::R_386_GOT32: | |
2697 | case elfcpp::R_386_PLT32: | |
2698 | case elfcpp::R_386_GOTOFF: | |
2699 | case elfcpp::R_386_GOTPC: | |
2700 | return 4; | |
2701 | ||
2702 | case elfcpp::R_386_16: | |
2703 | case elfcpp::R_386_PC16: | |
2704 | return 2; | |
2705 | ||
2706 | case elfcpp::R_386_8: | |
2707 | case elfcpp::R_386_PC8: | |
2708 | return 1; | |
2709 | ||
2710 | // These are relocations which should only be seen by the | |
2711 | // dynamic linker, and should never be seen here. | |
2712 | case elfcpp::R_386_COPY: | |
2713 | case elfcpp::R_386_GLOB_DAT: | |
2714 | case elfcpp::R_386_JUMP_SLOT: | |
2715 | case elfcpp::R_386_RELATIVE: | |
2716 | case elfcpp::R_386_TLS_TPOFF: | |
2717 | case elfcpp::R_386_TLS_DTPMOD32: | |
2718 | case elfcpp::R_386_TLS_DTPOFF32: | |
2719 | case elfcpp::R_386_TLS_TPOFF32: | |
2720 | case elfcpp::R_386_TLS_DESC: | |
2721 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2722 | return 0; | |
2723 | ||
2724 | case elfcpp::R_386_32PLT: | |
2725 | case elfcpp::R_386_TLS_GD_32: | |
2726 | case elfcpp::R_386_TLS_GD_PUSH: | |
2727 | case elfcpp::R_386_TLS_GD_CALL: | |
2728 | case elfcpp::R_386_TLS_GD_POP: | |
2729 | case elfcpp::R_386_TLS_LDM_32: | |
2730 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2731 | case elfcpp::R_386_TLS_LDM_CALL: | |
2732 | case elfcpp::R_386_TLS_LDM_POP: | |
2733 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2734 | default: | |
2735 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2736 | return 0; | |
2737 | } | |
2738 | } | |
2739 | ||
2740 | // Scan the relocs during a relocatable link. | |
2741 | ||
2742 | void | |
ad0f2072 | 2743 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2744 | Layout* layout, |
2745 | Sized_relobj<32, false>* object, | |
2746 | unsigned int data_shndx, | |
2747 | unsigned int sh_type, | |
2748 | const unsigned char* prelocs, | |
2749 | size_t reloc_count, | |
2750 | Output_section* output_section, | |
2751 | bool needs_special_offset_handling, | |
2752 | size_t local_symbol_count, | |
2753 | const unsigned char* plocal_symbols, | |
2754 | Relocatable_relocs* rr) | |
2755 | { | |
2756 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2757 | ||
2758 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2759 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2760 | ||
7019cd25 | 2761 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 2762 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2763 | symtab, |
2764 | layout, | |
2765 | object, | |
2766 | data_shndx, | |
2767 | prelocs, | |
2768 | reloc_count, | |
2769 | output_section, | |
2770 | needs_special_offset_handling, | |
2771 | local_symbol_count, | |
2772 | plocal_symbols, | |
2773 | rr); | |
2774 | } | |
2775 | ||
2776 | // Relocate a section during a relocatable link. | |
2777 | ||
2778 | void | |
2779 | Target_i386::relocate_for_relocatable( | |
2780 | const Relocate_info<32, false>* relinfo, | |
2781 | unsigned int sh_type, | |
2782 | const unsigned char* prelocs, | |
2783 | size_t reloc_count, | |
2784 | Output_section* output_section, | |
2785 | off_t offset_in_output_section, | |
2786 | const Relocatable_relocs* rr, | |
2787 | unsigned char* view, | |
2788 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2789 | section_size_type view_size, | |
2790 | unsigned char* reloc_view, | |
2791 | section_size_type reloc_view_size) | |
2792 | { | |
2793 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2794 | ||
7019cd25 | 2795 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2796 | relinfo, |
2797 | prelocs, | |
2798 | reloc_count, | |
2799 | output_section, | |
2800 | offset_in_output_section, | |
2801 | rr, | |
2802 | view, | |
2803 | view_address, | |
2804 | view_size, | |
2805 | reloc_view, | |
2806 | reloc_view_size); | |
2807 | } | |
2808 | ||
ab5c9e90 ILT |
2809 | // Return the value to use for a dynamic which requires special |
2810 | // treatment. This is how we support equality comparisons of function | |
2811 | // pointers across shared library boundaries, as described in the | |
2812 | // processor specific ABI supplement. | |
2813 | ||
2814 | uint64_t | |
2815 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2816 | { | |
2817 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2818 | return this->plt_section()->address() + gsym->plt_offset(); | |
2819 | } | |
2820 | ||
c51e6221 ILT |
2821 | // Return a string used to fill a code section with nops to take up |
2822 | // the specified length. | |
2823 | ||
2824 | std::string | |
8851ecca | 2825 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2826 | { |
2827 | if (length >= 16) | |
2828 | { | |
2829 | // Build a jmp instruction to skip over the bytes. | |
2830 | unsigned char jmp[5]; | |
2831 | jmp[0] = 0xe9; | |
2832 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2833 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2834 | + std::string(length - 5, '\0')); | |
2835 | } | |
2836 | ||
2837 | // Nop sequences of various lengths. | |
2838 | const char nop1[1] = { 0x90 }; // nop | |
2839 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2840 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2841 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2842 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2843 | 0x00 }; // leal 0(%esi,1),%esi | |
2844 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2845 | 0x00, 0x00 }; | |
2846 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2847 | 0x00, 0x00, 0x00 }; | |
2848 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2849 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2850 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2851 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2852 | 0x00 }; | |
2853 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2854 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2855 | 0x00, 0x00 }; | |
2856 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2857 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2858 | 0x00, 0x00, 0x00 }; | |
2859 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2860 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2861 | 0x00, 0x00, 0x00, 0x00 }; | |
2862 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2863 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2864 | 0x27, 0x00, 0x00, 0x00, | |
2865 | 0x00 }; | |
2866 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2867 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2868 | 0xbc, 0x27, 0x00, 0x00, | |
2869 | 0x00, 0x00 }; | |
2870 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2871 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2872 | 0x90, 0x90, 0x90, 0x90, | |
2873 | 0x90, 0x90, 0x90 }; | |
2874 | ||
2875 | const char* nops[16] = { | |
2876 | NULL, | |
2877 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2878 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2879 | }; | |
2880 | ||
2881 | return std::string(nops[length], length); | |
2882 | } | |
2883 | ||
b6848d3c ILT |
2884 | // Return whether SYM should be treated as a call to a non-split |
2885 | // function. We don't want that to be true of a call to a | |
2886 | // get_pc_thunk function. | |
2887 | ||
2888 | bool | |
2889 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
2890 | { | |
2891 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
2892 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
2893 | } | |
2894 | ||
364c7fa5 ILT |
2895 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2896 | // compiled with -fstack-split. The function calls non-stack-split | |
2897 | // code. We have to change the function so that it always ensures | |
2898 | // that it has enough stack space to run some random function. | |
2899 | ||
2900 | void | |
2901 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2902 | section_offset_type fnoffset, | |
2903 | section_size_type fnsize, | |
2904 | unsigned char* view, | |
2905 | section_size_type view_size, | |
2906 | std::string* from, | |
2907 | std::string* to) const | |
2908 | { | |
2909 | // The function starts with a comparison of the stack pointer and a | |
2910 | // field in the TCB. This is followed by a jump. | |
2911 | ||
2912 | // cmp %gs:NN,%esp | |
2913 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
2914 | && fnsize > 7) | |
2915 | { | |
2916 | // We will call __morestack if the carry flag is set after this | |
2917 | // comparison. We turn the comparison into an stc instruction | |
2918 | // and some nops. | |
2919 | view[fnoffset] = '\xf9'; | |
2920 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
2921 | } | |
2922 | // lea NN(%esp),%ecx | |
1782c879 ILT |
2923 | // lea NN(%esp),%edx |
2924 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
2925 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
2926 | && fnsize > 7) |
2927 | { | |
2928 | // This is loading an offset from the stack pointer for a | |
2929 | // comparison. The offset is negative, so we decrease the | |
2930 | // offset by the amount of space we need for the stack. This | |
2931 | // means we will avoid calling __morestack if there happens to | |
2932 | // be plenty of space on the stack already. | |
2933 | unsigned char* pval = view + fnoffset + 3; | |
2934 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2935 | val -= parameters->options().split_stack_adjust_size(); | |
2936 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2937 | } | |
2938 | else | |
2939 | { | |
2940 | if (!object->has_no_split_stack()) | |
2941 | object->error(_("failed to match split-stack sequence at " | |
2942 | "section %u offset %0zx"), | |
ac33a407 | 2943 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2944 | return; |
2945 | } | |
2946 | ||
2947 | // We have to change the function so that it calls | |
2948 | // __morestack_non_split instead of __morestack. The former will | |
2949 | // allocate additional stack space. | |
2950 | *from = "__morestack"; | |
2951 | *to = "__morestack_non_split"; | |
2952 | } | |
2953 | ||
14bfc3f5 ILT |
2954 | // The selector for i386 object files. |
2955 | ||
36959681 | 2956 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
2957 | { |
2958 | public: | |
2959 | Target_selector_i386() | |
36959681 ILT |
2960 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
2961 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
2962 | { } |
2963 | ||
2964 | Target* | |
e96caa79 ILT |
2965 | do_instantiate_target() |
2966 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2967 | }; |
2968 | ||
14bfc3f5 ILT |
2969 | Target_selector_i386 target_selector_i386; |
2970 | ||
2971 | } // End anonymous namespace. |