Commit | Line | Data |
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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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), |
e785ec03 ILT |
62 | got_(NULL), plt_(NULL), got_plt_(NULL), global_offset_table_(NULL), |
63 | rel_dyn_(NULL), copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 64 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 65 | { } |
75f65a3e | 66 | |
6d03d481 ST |
67 | // Process the relocations to determine unreferenced sections for |
68 | // garbage collection. | |
69 | void | |
ad0f2072 | 70 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
71 | Layout* layout, |
72 | Sized_relobj<32, false>* object, | |
73 | unsigned int data_shndx, | |
74 | unsigned int sh_type, | |
75 | const unsigned char* prelocs, | |
76 | size_t reloc_count, | |
77 | Output_section* output_section, | |
78 | bool needs_special_offset_handling, | |
79 | size_t local_symbol_count, | |
80 | const unsigned char* plocal_symbols); | |
81 | ||
92e059d8 | 82 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 83 | void |
ad0f2072 | 84 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 85 | Layout* layout, |
f6ce93d6 | 86 | Sized_relobj<32, false>* object, |
a3ad94ed | 87 | unsigned int data_shndx, |
92e059d8 ILT |
88 | unsigned int sh_type, |
89 | const unsigned char* prelocs, | |
90 | size_t reloc_count, | |
730cdc88 ILT |
91 | Output_section* output_section, |
92 | bool needs_special_offset_handling, | |
92e059d8 | 93 | size_t local_symbol_count, |
730cdc88 | 94 | const unsigned char* plocal_symbols); |
61ba1cf9 | 95 | |
5a6f7e2d ILT |
96 | // Finalize the sections. |
97 | void | |
f59f41f3 | 98 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 99 | |
ab5c9e90 ILT |
100 | // Return the value to use for a dynamic which requires special |
101 | // treatment. | |
102 | uint64_t | |
103 | do_dynsym_value(const Symbol*) const; | |
104 | ||
92e059d8 ILT |
105 | // Relocate a section. |
106 | void | |
107 | relocate_section(const Relocate_info<32, false>*, | |
108 | unsigned int sh_type, | |
109 | const unsigned char* prelocs, | |
110 | size_t reloc_count, | |
730cdc88 ILT |
111 | Output_section* output_section, |
112 | bool needs_special_offset_handling, | |
92e059d8 ILT |
113 | unsigned char* view, |
114 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
115 | section_size_type view_size, |
116 | const Reloc_symbol_changes*); | |
92e059d8 | 117 | |
6a74a719 ILT |
118 | // Scan the relocs during a relocatable link. |
119 | void | |
ad0f2072 | 120 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
121 | Layout* layout, |
122 | Sized_relobj<32, false>* object, | |
123 | unsigned int data_shndx, | |
124 | unsigned int sh_type, | |
125 | const unsigned char* prelocs, | |
126 | size_t reloc_count, | |
127 | Output_section* output_section, | |
128 | bool needs_special_offset_handling, | |
129 | size_t local_symbol_count, | |
130 | const unsigned char* plocal_symbols, | |
131 | Relocatable_relocs*); | |
132 | ||
133 | // Relocate a section during a relocatable link. | |
134 | void | |
135 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
136 | unsigned int sh_type, | |
137 | const unsigned char* prelocs, | |
138 | size_t reloc_count, | |
139 | Output_section* output_section, | |
140 | off_t offset_in_output_section, | |
141 | const Relocatable_relocs*, | |
142 | unsigned char* view, | |
143 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
144 | section_size_type view_size, | |
145 | unsigned char* reloc_view, | |
146 | section_size_type reloc_view_size); | |
147 | ||
c51e6221 ILT |
148 | // Return a string used to fill a code section with nops. |
149 | std::string | |
8851ecca | 150 | do_code_fill(section_size_type length) const; |
c51e6221 | 151 | |
9a2d6984 ILT |
152 | // Return whether SYM is defined by the ABI. |
153 | bool | |
9c2d0ef9 | 154 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
155 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
156 | ||
bb04269c DK |
157 | // Return whether a symbol name implies a local label. The UnixWare |
158 | // 2.1 cc generates temporary symbols that start with .X, so we | |
159 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
160 | // If so, we should move the .X recognition into | |
161 | // Target::do_is_local_label_name. | |
162 | bool | |
163 | do_is_local_label_name(const char* name) const | |
164 | { | |
165 | if (name[0] == '.' && name[1] == 'X') | |
166 | return true; | |
167 | return Target::do_is_local_label_name(name); | |
168 | } | |
169 | ||
364c7fa5 ILT |
170 | // Adjust -fstack-split code which calls non-stack-split code. |
171 | void | |
172 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
173 | section_offset_type fnoffset, section_size_type fnsize, | |
174 | unsigned char* view, section_size_type view_size, | |
175 | std::string* from, std::string* to) const; | |
176 | ||
96f2030e | 177 | // Return the size of the GOT section. |
fe8718a4 | 178 | section_size_type |
96f2030e ILT |
179 | got_size() |
180 | { | |
181 | gold_assert(this->got_ != NULL); | |
182 | return this->got_->data_size(); | |
183 | } | |
184 | ||
92e059d8 ILT |
185 | private: |
186 | // The class which scans relocations. | |
187 | struct Scan | |
61ba1cf9 ILT |
188 | { |
189 | inline void | |
ad0f2072 | 190 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 191 | Sized_relobj<32, false>* object, |
a3ad94ed | 192 | unsigned int data_shndx, |
07f397ab | 193 | Output_section* output_section, |
92e059d8 ILT |
194 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
195 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 196 | |
92e059d8 | 197 | inline void |
ad0f2072 | 198 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 199 | Sized_relobj<32, false>* object, |
a3ad94ed | 200 | unsigned int data_shndx, |
07f397ab | 201 | Output_section* output_section, |
92e059d8 ILT |
202 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
203 | Symbol* gsym); | |
af6359d5 | 204 | |
21bb3914 ST |
205 | inline bool |
206 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_i386* , | |
207 | Sized_relobj<32, false>* , | |
208 | unsigned int , | |
209 | Output_section* , | |
210 | const elfcpp::Rel<32, false>& , | |
211 | unsigned int , | |
212 | const elfcpp::Sym<32, false>&) | |
213 | { return false; } | |
214 | ||
215 | inline bool | |
216 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
217 | Target_i386* , | |
218 | Sized_relobj<32, false>* , | |
219 | unsigned int , | |
220 | Output_section* , | |
221 | const elfcpp::Rel<32, false>& , | |
222 | unsigned int , Symbol*) | |
223 | { return false; } | |
224 | ||
af6359d5 ILT |
225 | static void |
226 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
227 | ||
228 | static void | |
229 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
230 | Symbol*); | |
61ba1cf9 ILT |
231 | }; |
232 | ||
92e059d8 ILT |
233 | // The class which implements relocation. |
234 | class Relocate | |
235 | { | |
236 | public: | |
ead1e424 | 237 | Relocate() |
46cf9fa2 | 238 | : skip_call_tls_get_addr_(false), |
82bb573a | 239 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
240 | { } |
241 | ||
242 | ~Relocate() | |
243 | { | |
244 | if (this->skip_call_tls_get_addr_) | |
245 | { | |
246 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 247 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
248 | } |
249 | } | |
250 | ||
86849f1f ILT |
251 | // Return whether the static relocation needs to be applied. |
252 | inline bool | |
253 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 254 | int ref_flags, |
031cdbed ILT |
255 | bool is_32bit, |
256 | Output_section* output_section); | |
86849f1f | 257 | |
ead1e424 ILT |
258 | // Do a relocation. Return false if the caller should not issue |
259 | // any warnings about this relocation. | |
260 | inline bool | |
031cdbed ILT |
261 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
262 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 263 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 264 | const Symbol_value<32>*, |
92e059d8 | 265 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 266 | section_size_type); |
92e059d8 ILT |
267 | |
268 | private: | |
269 | // Do a TLS relocation. | |
ead1e424 | 270 | inline void |
07f397ab ILT |
271 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
272 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 273 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 274 | const Symbol_value<32>*, |
fe8718a4 ILT |
275 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
276 | section_size_type); | |
92e059d8 | 277 | |
07f397ab ILT |
278 | // Do a TLS General-Dynamic to Initial-Exec transition. |
279 | inline void | |
280 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
281 | Output_segment* tls_segment, | |
282 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
283 | elfcpp::Elf_types<32>::Elf_Addr value, | |
284 | unsigned char* view, | |
fe8718a4 | 285 | section_size_type view_size); |
07f397ab | 286 | |
56622147 ILT |
287 | // Do a TLS General-Dynamic to Local-Exec transition. |
288 | inline void | |
289 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
290 | Output_segment* tls_segment, |
291 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
292 | elfcpp::Elf_types<32>::Elf_Addr value, | |
293 | unsigned char* view, | |
fe8718a4 | 294 | section_size_type view_size); |
92e059d8 | 295 | |
c2b45e22 CC |
296 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
297 | // transition. | |
298 | inline void | |
299 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
300 | Output_segment* tls_segment, | |
301 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
302 | elfcpp::Elf_types<32>::Elf_Addr value, | |
303 | unsigned char* view, | |
304 | section_size_type view_size); | |
305 | ||
306 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
307 | // transition. | |
308 | inline void | |
309 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
310 | Output_segment* tls_segment, | |
311 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
312 | elfcpp::Elf_types<32>::Elf_Addr value, | |
313 | unsigned char* view, | |
314 | section_size_type view_size); | |
315 | ||
56622147 | 316 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 317 | inline void |
56622147 | 318 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
319 | Output_segment* tls_segment, |
320 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
321 | elfcpp::Elf_types<32>::Elf_Addr value, | |
322 | unsigned char* view, | |
fe8718a4 | 323 | section_size_type view_size); |
ead1e424 | 324 | |
56622147 ILT |
325 | // Do a TLS Initial-Exec to Local-Exec transition. |
326 | static inline void | |
327 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
328 | Output_segment* tls_segment, |
329 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
330 | elfcpp::Elf_types<32>::Elf_Addr value, | |
331 | unsigned char* view, | |
fe8718a4 | 332 | section_size_type view_size); |
46cf9fa2 | 333 | |
46cf9fa2 ILT |
334 | // We need to keep track of which type of local dynamic relocation |
335 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
336 | enum Local_dynamic_type | |
337 | { | |
338 | LOCAL_DYNAMIC_NONE, | |
339 | LOCAL_DYNAMIC_SUN, | |
340 | LOCAL_DYNAMIC_GNU | |
341 | }; | |
342 | ||
ead1e424 ILT |
343 | // This is set if we should skip the next reloc, which should be a |
344 | // PLT32 reloc against ___tls_get_addr. | |
345 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
346 | // The type of local dynamic relocation we have seen in the section |
347 | // being relocated, if any. | |
348 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
349 | }; |
350 | ||
6a74a719 ILT |
351 | // A class which returns the size required for a relocation type, |
352 | // used while scanning relocs during a relocatable link. | |
353 | class Relocatable_size_for_reloc | |
354 | { | |
355 | public: | |
356 | unsigned int | |
357 | get_size_for_reloc(unsigned int, Relobj*); | |
358 | }; | |
359 | ||
92e059d8 ILT |
360 | // Adjust TLS relocation type based on the options and whether this |
361 | // is a local symbol. | |
af6359d5 | 362 | static tls::Tls_optimization |
7e1edb90 | 363 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 364 | |
ead1e424 | 365 | // Get the GOT section, creating it if necessary. |
dbe717ef | 366 | Output_data_got<32, false>* |
7e1edb90 | 367 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 368 | |
96f2030e ILT |
369 | // Get the GOT PLT section. |
370 | Output_data_space* | |
371 | got_plt_section() const | |
372 | { | |
373 | gold_assert(this->got_plt_ != NULL); | |
374 | return this->got_plt_; | |
375 | } | |
376 | ||
a3ad94ed ILT |
377 | // Create a PLT entry for a global symbol. |
378 | void | |
7e1edb90 | 379 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 380 | |
9fa33bee | 381 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
382 | void |
383 | define_tls_base_symbol(Symbol_table*, Layout*); | |
384 | ||
94c4710f ILT |
385 | // Create a GOT entry for the TLS module index. |
386 | unsigned int | |
387 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
388 | Sized_relobj<32, false>* object); | |
389 | ||
a3ad94ed | 390 | // Get the PLT section. |
e291e7b9 | 391 | Output_data_plt_i386* |
a3ad94ed ILT |
392 | plt_section() const |
393 | { | |
394 | gold_assert(this->plt_ != NULL); | |
395 | return this->plt_; | |
396 | } | |
397 | ||
5a6f7e2d ILT |
398 | // Get the dynamic reloc section, creating it if necessary. |
399 | Reloc_section* | |
400 | rel_dyn_section(Layout*); | |
401 | ||
e291e7b9 ILT |
402 | // Get the section to use for TLS_DESC relocations. |
403 | Reloc_section* | |
404 | rel_tls_desc_section(Layout*) const; | |
405 | ||
12c0daef | 406 | // Add a potential copy relocation. |
a3ad94ed | 407 | void |
ef9beddf ILT |
408 | copy_reloc(Symbol_table* symtab, Layout* layout, |
409 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
410 | unsigned int shndx, Output_section* output_section, |
411 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
412 | { | |
413 | this->copy_relocs_.copy_reloc(symtab, layout, | |
414 | symtab->get_sized_symbol<32>(sym), | |
415 | object, shndx, output_section, reloc, | |
416 | this->rel_dyn_section(layout)); | |
417 | } | |
ead1e424 | 418 | |
92e059d8 ILT |
419 | // Information about this specific target which we pass to the |
420 | // general Target structure. | |
75f65a3e | 421 | static const Target::Target_info i386_info; |
ead1e424 | 422 | |
0a65a3a7 CC |
423 | // The types of GOT entries needed for this platform. |
424 | enum Got_type | |
425 | { | |
426 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
427 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
428 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
429 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
430 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
431 | }; |
432 | ||
ead1e424 | 433 | // The GOT section. |
dbe717ef | 434 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
435 | // The PLT section. |
436 | Output_data_plt_i386* plt_; | |
437 | // The GOT PLT section. | |
438 | Output_data_space* got_plt_; | |
e785ec03 ILT |
439 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
440 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
441 | // The dynamic reloc section. |
442 | Reloc_section* rel_dyn_; | |
443 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 444 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
445 | // Space for variables copied with a COPY reloc. |
446 | Output_data_space* dynbss_; | |
c2b45e22 | 447 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 448 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
449 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
450 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
451 | }; |
452 | ||
453 | const Target::Target_info Target_i386::i386_info = | |
454 | { | |
61ba1cf9 ILT |
455 | 32, // size |
456 | false, // is_big_endian | |
457 | elfcpp::EM_386, // machine_code | |
458 | false, // has_make_symbol | |
dbe717ef | 459 | false, // has_resolve |
c51e6221 | 460 | true, // has_code_fill |
35cdfc9a | 461 | true, // is_default_stack_executable |
0864d551 | 462 | '\0', // wrap_char |
dbe717ef | 463 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 464 | 0x08048000, // default_text_segment_address |
cd72c291 | 465 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
466 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
467 | elfcpp::SHN_UNDEF, // small_common_shndx | |
468 | elfcpp::SHN_UNDEF, // large_common_shndx | |
469 | 0, // small_common_section_flags | |
05a352e6 DK |
470 | 0, // large_common_section_flags |
471 | NULL, // attributes_section | |
472 | NULL // attributes_vendor | |
14bfc3f5 ILT |
473 | }; |
474 | ||
ead1e424 ILT |
475 | // Get the GOT section, creating it if necessary. |
476 | ||
dbe717ef | 477 | Output_data_got<32, false>* |
7e1edb90 | 478 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
479 | { |
480 | if (this->got_ == NULL) | |
481 | { | |
7e1edb90 | 482 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 483 | |
7e1edb90 | 484 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 485 | |
9f1d377b ILT |
486 | Output_section* os; |
487 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
488 | (elfcpp::SHF_ALLOC | |
489 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
490 | this->got_, false, true, true, |
491 | false); | |
ead1e424 | 492 | |
7d9e3d98 | 493 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
1a2dff53 | 494 | os = layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
9f1d377b ILT |
495 | (elfcpp::SHF_ALLOC |
496 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
497 | this->got_plt_, false, false, false, |
498 | true); | |
a3ad94ed | 499 | |
ead1e424 | 500 | // The first three entries are reserved. |
27bc2bce | 501 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 502 | |
1a2dff53 ILT |
503 | // Those bytes can go into the relro segment. |
504 | layout->increase_relro(3 * 4); | |
505 | ||
a3ad94ed | 506 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
507 | this->global_offset_table_ = |
508 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
509 | Symbol_table::PREDEFINED, | |
510 | this->got_plt_, | |
511 | 0, 0, elfcpp::STT_OBJECT, | |
512 | elfcpp::STB_LOCAL, | |
513 | elfcpp::STV_HIDDEN, 0, | |
514 | false, false); | |
ead1e424 | 515 | } |
a3ad94ed | 516 | |
ead1e424 ILT |
517 | return this->got_; |
518 | } | |
519 | ||
5a6f7e2d ILT |
520 | // Get the dynamic reloc section, creating it if necessary. |
521 | ||
522 | Target_i386::Reloc_section* | |
523 | Target_i386::rel_dyn_section(Layout* layout) | |
524 | { | |
525 | if (this->rel_dyn_ == NULL) | |
526 | { | |
527 | gold_assert(layout != NULL); | |
d98bc257 | 528 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 529 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
1a2dff53 ILT |
530 | elfcpp::SHF_ALLOC, this->rel_dyn_, true, |
531 | false, false, false); | |
5a6f7e2d ILT |
532 | } |
533 | return this->rel_dyn_; | |
534 | } | |
535 | ||
a3ad94ed ILT |
536 | // A class to handle the PLT data. |
537 | ||
538 | class Output_data_plt_i386 : public Output_section_data | |
539 | { | |
540 | public: | |
541 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
542 | ||
7e1edb90 | 543 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
544 | |
545 | // Add an entry to the PLT. | |
546 | void | |
547 | add_entry(Symbol* gsym); | |
548 | ||
16649710 ILT |
549 | // Return the .rel.plt section data. |
550 | const Reloc_section* | |
551 | rel_plt() const | |
552 | { return this->rel_; } | |
553 | ||
e291e7b9 ILT |
554 | // Return where the TLS_DESC relocations should go. |
555 | Reloc_section* | |
556 | rel_tls_desc(Layout*); | |
557 | ||
16649710 ILT |
558 | protected: |
559 | void | |
560 | do_adjust_output_section(Output_section* os); | |
561 | ||
7d9e3d98 ILT |
562 | // Write to a map file. |
563 | void | |
564 | do_print_to_mapfile(Mapfile* mapfile) const | |
565 | { mapfile->print_output_data(this, _("** PLT")); } | |
566 | ||
a3ad94ed ILT |
567 | private: |
568 | // The size of an entry in the PLT. | |
569 | static const int plt_entry_size = 16; | |
570 | ||
571 | // The first entry in the PLT for an executable. | |
572 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
573 | ||
574 | // The first entry in the PLT for a shared object. | |
575 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
576 | ||
577 | // Other entries in the PLT for an executable. | |
578 | static unsigned char exec_plt_entry[plt_entry_size]; | |
579 | ||
580 | // Other entries in the PLT for a shared object. | |
581 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
582 | ||
583 | // Set the final size. | |
584 | void | |
27bc2bce | 585 | set_final_data_size() |
a3ad94ed ILT |
586 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
587 | ||
588 | // Write out the PLT data. | |
589 | void | |
590 | do_write(Output_file*); | |
591 | ||
592 | // The reloc section. | |
593 | Reloc_section* rel_; | |
e291e7b9 ILT |
594 | // The TLS_DESC relocations, if necessary. These must follow the |
595 | // regular PLT relocs. | |
596 | Reloc_section* tls_desc_rel_; | |
a3ad94ed ILT |
597 | // The .got.plt section. |
598 | Output_data_space* got_plt_; | |
599 | // The number of PLT entries. | |
600 | unsigned int count_; | |
a3ad94ed ILT |
601 | }; |
602 | ||
603 | // Create the PLT section. The ordinary .got section is an argument, | |
604 | // since we need to refer to the start. We also create our own .got | |
605 | // section just for PLT entries. | |
606 | ||
607 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 608 | Output_data_space* got_plt) |
e291e7b9 | 609 | : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0) |
a3ad94ed | 610 | { |
d98bc257 | 611 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 612 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
1a2dff53 ILT |
613 | elfcpp::SHF_ALLOC, this->rel_, true, |
614 | false, false, false); | |
a3ad94ed ILT |
615 | } |
616 | ||
16649710 ILT |
617 | void |
618 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
619 | { | |
620 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
621 | // linker, and so do we. | |
622 | os->set_entsize(4); | |
623 | } | |
624 | ||
a3ad94ed ILT |
625 | // Add an entry to the PLT. |
626 | ||
627 | void | |
628 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
629 | { | |
630 | gold_assert(!gsym->has_plt_offset()); | |
631 | ||
632 | // Note that when setting the PLT offset we skip the initial | |
633 | // reserved PLT entry. | |
634 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
635 | ||
636 | ++this->count_; | |
637 | ||
fe8718a4 | 638 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
639 | |
640 | // Every PLT entry needs a GOT entry which points back to the PLT | |
641 | // entry (this will be changed by the dynamic linker, normally | |
642 | // lazily when the function is called). | |
27bc2bce | 643 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
644 | |
645 | // Every PLT entry needs a reloc. | |
16649710 | 646 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
647 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
648 | got_offset); | |
649 | ||
650 | // Note that we don't need to save the symbol. The contents of the | |
651 | // PLT are independent of which symbols are used. The symbols only | |
652 | // appear in the relocations. | |
653 | } | |
654 | ||
e291e7b9 ILT |
655 | // Return where the TLS_DESC relocations should go, creating it if |
656 | // necessary. These follow the JUMP_SLOT relocations. | |
657 | ||
658 | Output_data_plt_i386::Reloc_section* | |
659 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
660 | { | |
661 | if (this->tls_desc_rel_ == NULL) | |
662 | { | |
663 | this->tls_desc_rel_ = new Reloc_section(false); | |
664 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
665 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
666 | true, false, false, false); | |
667 | gold_assert(this->tls_desc_rel_->output_section() == | |
668 | this->rel_->output_section()); | |
669 | } | |
670 | return this->tls_desc_rel_; | |
671 | } | |
672 | ||
a3ad94ed ILT |
673 | // The first entry in the PLT for an executable. |
674 | ||
675 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
676 | { | |
677 | 0xff, 0x35, // pushl contents of memory address | |
678 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
679 | 0xff, 0x25, // jmp indirect | |
680 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
681 | 0, 0, 0, 0 // unused | |
682 | }; | |
683 | ||
684 | // The first entry in the PLT for a shared object. | |
685 | ||
686 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
687 | { | |
688 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
689 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
690 | 0, 0, 0, 0 // unused | |
691 | }; | |
692 | ||
693 | // Subsequent entries in the PLT for an executable. | |
694 | ||
695 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
696 | { | |
697 | 0xff, 0x25, // jmp indirect | |
698 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
699 | 0x68, // pushl immediate | |
700 | 0, 0, 0, 0, // replaced with offset into relocation table | |
701 | 0xe9, // jmp relative | |
702 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
703 | }; | |
704 | ||
705 | // Subsequent entries in the PLT for a shared object. | |
706 | ||
707 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
708 | { | |
709 | 0xff, 0xa3, // jmp *offset(%ebx) | |
710 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
711 | 0x68, // pushl immediate | |
712 | 0, 0, 0, 0, // replaced with offset into relocation table | |
713 | 0xe9, // jmp relative | |
714 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
715 | }; | |
716 | ||
717 | // Write out the PLT. This uses the hand-coded instructions above, | |
718 | // and adjusts them as needed. This is all specified by the i386 ELF | |
719 | // Processor Supplement. | |
720 | ||
721 | void | |
722 | Output_data_plt_i386::do_write(Output_file* of) | |
723 | { | |
2ea97941 | 724 | const off_t offset = this->offset(); |
fe8718a4 ILT |
725 | const section_size_type oview_size = |
726 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 727 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
728 | |
729 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
730 | const section_size_type got_size = |
731 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
732 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
733 | got_size); | |
734 | ||
735 | unsigned char* pov = oview; | |
736 | ||
737 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
738 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
739 | ||
374ad285 | 740 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
741 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
742 | else | |
743 | { | |
744 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
745 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
746 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
747 | } | |
748 | pov += plt_entry_size; | |
749 | ||
750 | unsigned char* got_pov = got_view; | |
751 | ||
752 | memset(got_pov, 0, 12); | |
753 | got_pov += 12; | |
754 | ||
755 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
756 | ||
757 | unsigned int plt_offset = plt_entry_size; | |
758 | unsigned int plt_rel_offset = 0; | |
759 | unsigned int got_offset = 12; | |
760 | const unsigned int count = this->count_; | |
761 | for (unsigned int i = 0; | |
762 | i < count; | |
763 | ++i, | |
764 | pov += plt_entry_size, | |
765 | got_pov += 4, | |
766 | plt_offset += plt_entry_size, | |
767 | plt_rel_offset += rel_size, | |
768 | got_offset += 4) | |
769 | { | |
770 | // Set and adjust the PLT entry itself. | |
771 | ||
374ad285 | 772 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
773 | { |
774 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
775 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
776 | } | |
777 | else | |
778 | { | |
779 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
780 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
781 | (got_address | |
782 | + got_offset)); | |
783 | } | |
784 | ||
785 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
786 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
787 | - (plt_offset + plt_entry_size)); | |
788 | ||
789 | // Set the entry in the GOT. | |
790 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
791 | } | |
792 | ||
fe8718a4 ILT |
793 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
794 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 795 | |
2ea97941 | 796 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
797 | of->write_output_view(got_file_offset, got_size, got_view); |
798 | } | |
799 | ||
800 | // Create a PLT entry for a global symbol. | |
801 | ||
802 | void | |
7e1edb90 | 803 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
804 | { |
805 | if (gsym->has_plt_offset()) | |
806 | return; | |
807 | ||
808 | if (this->plt_ == NULL) | |
809 | { | |
810 | // Create the GOT sections first. | |
7e1edb90 | 811 | this->got_section(symtab, layout); |
a3ad94ed | 812 | |
7e1edb90 | 813 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
814 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
815 | (elfcpp::SHF_ALLOC | |
816 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 817 | this->plt_, false, false, false, false); |
a3ad94ed ILT |
818 | } |
819 | ||
820 | this->plt_->add_entry(gsym); | |
821 | } | |
822 | ||
e291e7b9 ILT |
823 | // Get the section to use for TLS_DESC relocations. |
824 | ||
825 | Target_i386::Reloc_section* | |
826 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
827 | { | |
828 | return this->plt_section()->rel_tls_desc(layout); | |
829 | } | |
830 | ||
9fa33bee | 831 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
832 | |
833 | void | |
834 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
835 | { | |
836 | if (this->tls_base_symbol_defined_) | |
837 | return; | |
838 | ||
839 | Output_segment* tls_segment = layout->tls_segment(); | |
840 | if (tls_segment != NULL) | |
841 | { | |
183fd0e3 | 842 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 843 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 844 | Symbol_table::PREDEFINED, |
edfbb029 CC |
845 | tls_segment, 0, 0, |
846 | elfcpp::STT_TLS, | |
847 | elfcpp::STB_LOCAL, | |
848 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
849 | (is_exec |
850 | ? Symbol::SEGMENT_END | |
851 | : Symbol::SEGMENT_START), | |
852 | true); | |
edfbb029 CC |
853 | } |
854 | this->tls_base_symbol_defined_ = true; | |
855 | } | |
856 | ||
94c4710f ILT |
857 | // Create a GOT entry for the TLS module index. |
858 | ||
859 | unsigned int | |
860 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
861 | Sized_relobj<32, false>* object) | |
862 | { | |
863 | if (this->got_mod_index_offset_ == -1U) | |
864 | { | |
865 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
866 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
867 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
868 | unsigned int got_offset = got->add_constant(0); | |
869 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
870 | got_offset); | |
009a67a2 | 871 | got->add_constant(0); |
94c4710f ILT |
872 | this->got_mod_index_offset_ = got_offset; |
873 | } | |
874 | return this->got_mod_index_offset_; | |
875 | } | |
876 | ||
92e059d8 | 877 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
878 | // symbol. IS_FINAL is true if the final address of this symbol is |
879 | // known at link time. | |
92e059d8 | 880 | |
af6359d5 | 881 | tls::Tls_optimization |
7e1edb90 | 882 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
883 | { |
884 | // If we are generating a shared library, then we can't do anything | |
885 | // in the linker. | |
8851ecca | 886 | if (parameters->options().shared()) |
af6359d5 | 887 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
888 | |
889 | switch (r_type) | |
890 | { | |
891 | case elfcpp::R_386_TLS_GD: | |
892 | case elfcpp::R_386_TLS_GOTDESC: | |
893 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 894 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
895 | // access. Since we know that we are generating an executable, |
896 | // we can convert this to Initial-Exec. If we also know that | |
897 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 898 | if (is_final) |
af6359d5 ILT |
899 | return tls::TLSOPT_TO_LE; |
900 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
901 | |
902 | case elfcpp::R_386_TLS_LDM: | |
903 | // This is Local-Dynamic, which refers to a local symbol in the | |
904 | // dynamic TLS block. Since we know that we generating an | |
905 | // executable, we can switch to Local-Exec. | |
af6359d5 | 906 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
907 | |
908 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
909 | // Another type of Local-Dynamic relocation. |
910 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
911 | |
912 | case elfcpp::R_386_TLS_IE: | |
913 | case elfcpp::R_386_TLS_GOTIE: | |
914 | case elfcpp::R_386_TLS_IE_32: | |
915 | // These are Initial-Exec relocs which get the thread offset | |
916 | // from the GOT. If we know that we are linking against the | |
917 | // local symbol, we can switch to Local-Exec, which links the | |
918 | // thread offset into the instruction. | |
a3ad94ed | 919 | if (is_final) |
af6359d5 ILT |
920 | return tls::TLSOPT_TO_LE; |
921 | return tls::TLSOPT_NONE; | |
8462ae85 | 922 | |
92e059d8 ILT |
923 | case elfcpp::R_386_TLS_LE: |
924 | case elfcpp::R_386_TLS_LE_32: | |
925 | // When we already have Local-Exec, there is nothing further we | |
926 | // can do. | |
af6359d5 | 927 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
928 | |
929 | default: | |
a3ad94ed | 930 | gold_unreachable(); |
92e059d8 ILT |
931 | } |
932 | } | |
933 | ||
af6359d5 ILT |
934 | // Report an unsupported relocation against a local symbol. |
935 | ||
936 | void | |
937 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
938 | unsigned int r_type) | |
939 | { | |
75f2446e ILT |
940 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
941 | object->name().c_str(), r_type); | |
af6359d5 ILT |
942 | } |
943 | ||
92e059d8 ILT |
944 | // Scan a relocation for a local symbol. |
945 | ||
946 | inline void | |
ad0f2072 | 947 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
948 | Layout* layout, |
949 | Target_i386* target, | |
f6ce93d6 | 950 | Sized_relobj<32, false>* object, |
1b64748b | 951 | unsigned int data_shndx, |
07f397ab | 952 | Output_section* output_section, |
1b64748b | 953 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 954 | unsigned int r_type, |
7bf1f802 | 955 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
956 | { |
957 | switch (r_type) | |
958 | { | |
959 | case elfcpp::R_386_NONE: | |
960 | case elfcpp::R_386_GNU_VTINHERIT: | |
961 | case elfcpp::R_386_GNU_VTENTRY: | |
962 | break; | |
963 | ||
964 | case elfcpp::R_386_32: | |
436ca963 ILT |
965 | // If building a shared library (or a position-independent |
966 | // executable), we need to create a dynamic relocation for | |
967 | // this location. The relocation applied at link time will | |
968 | // apply the link-time value, so we flag the location with | |
969 | // an R_386_RELATIVE relocation so the dynamic loader can | |
970 | // relocate it easily. | |
8851ecca | 971 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
972 | { |
973 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
974 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
975 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
976 | output_section, data_shndx, | |
977 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
978 | } |
979 | break; | |
980 | ||
981 | case elfcpp::R_386_16: | |
982 | case elfcpp::R_386_8: | |
983 | // If building a shared library (or a position-independent | |
984 | // executable), we need to create a dynamic relocation for | |
985 | // this location. Because the addend needs to remain in the | |
986 | // data section, we need to be careful not to apply this | |
987 | // relocation statically. | |
8851ecca | 988 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
989 | { |
990 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 991 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 992 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
993 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
994 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
995 | else |
996 | { | |
997 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
998 | unsigned int shndx = lsym.get_st_shndx(); |
999 | bool is_ordinary; | |
1000 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1001 | &is_ordinary); | |
1002 | if (!is_ordinary) | |
1003 | object->error(_("section symbol %u has bad shndx %u"), | |
1004 | r_sym, shndx); | |
1005 | else | |
1006 | rel_dyn->add_local_section(object, shndx, | |
1007 | r_type, output_section, | |
1008 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1009 | } |
436ca963 | 1010 | } |
92e059d8 ILT |
1011 | break; |
1012 | ||
1013 | case elfcpp::R_386_PC32: | |
1014 | case elfcpp::R_386_PC16: | |
1015 | case elfcpp::R_386_PC8: | |
1016 | break; | |
1017 | ||
df2efe71 ILT |
1018 | case elfcpp::R_386_PLT32: |
1019 | // Since we know this is a local symbol, we can handle this as a | |
1020 | // PC32 reloc. | |
1021 | break; | |
1022 | ||
ead1e424 ILT |
1023 | case elfcpp::R_386_GOTOFF: |
1024 | case elfcpp::R_386_GOTPC: | |
1025 | // We need a GOT section. | |
7e1edb90 | 1026 | target->got_section(symtab, layout); |
ead1e424 ILT |
1027 | break; |
1028 | ||
1b64748b ILT |
1029 | case elfcpp::R_386_GOT32: |
1030 | { | |
1031 | // The symbol requires a GOT entry. | |
1032 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1033 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 1034 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
1035 | { |
1036 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1037 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1038 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1039 | { |
1040 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2ea97941 | 1041 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
1042 | rel_dyn->add_local_relative( |
1043 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
1044 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
1045 | } |
1046 | } | |
1047 | } | |
1048 | break; | |
1049 | ||
af6359d5 ILT |
1050 | // These are relocations which should only be seen by the |
1051 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1052 | case elfcpp::R_386_COPY: |
1053 | case elfcpp::R_386_GLOB_DAT: | |
1054 | case elfcpp::R_386_JUMP_SLOT: | |
1055 | case elfcpp::R_386_RELATIVE: | |
1056 | case elfcpp::R_386_TLS_TPOFF: | |
1057 | case elfcpp::R_386_TLS_DTPMOD32: | |
1058 | case elfcpp::R_386_TLS_DTPOFF32: | |
1059 | case elfcpp::R_386_TLS_TPOFF32: | |
1060 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1061 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1062 | object->name().c_str(), r_type); |
92e059d8 ILT |
1063 | break; |
1064 | ||
af6359d5 | 1065 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1066 | // linking. |
56622147 ILT |
1067 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1068 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1069 | case elfcpp::R_386_TLS_DESC_CALL: | |
1070 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1071 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1072 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1073 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1074 | case elfcpp::R_386_TLS_GOTIE: |
1075 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1076 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1077 | { |
8851ecca | 1078 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1079 | const tls::Tls_optimization optimized_type |
1080 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1081 | switch (r_type) |
1082 | { | |
56622147 | 1083 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1084 | if (optimized_type == tls::TLSOPT_NONE) |
1085 | { | |
1086 | // Create a pair of GOT entries for the module index and | |
1087 | // dtv-relative offset. | |
1088 | Output_data_got<32, false>* got | |
1089 | = target->got_section(symtab, layout); | |
1090 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1091 | unsigned int shndx = lsym.get_st_shndx(); |
1092 | bool is_ordinary; | |
1093 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1094 | if (!is_ordinary) | |
1095 | object->error(_("local symbol %u has bad shndx %u"), | |
1096 | r_sym, shndx); | |
1097 | else | |
1098 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1099 | GOT_TYPE_TLS_PAIR, | |
1100 | target->rel_dyn_section(layout), | |
1101 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1102 | } |
1103 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1104 | unsupported_reloc_local(object, r_type); | |
1105 | break; | |
1106 | ||
56622147 | 1107 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1108 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1109 | if (optimized_type == tls::TLSOPT_NONE) |
1110 | { | |
1111 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1112 | Output_data_got<32, false>* got | |
1113 | = target->got_section(symtab, layout); | |
1114 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
1115 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1116 | { | |
1117 | unsigned int got_offset = got->add_constant(0); | |
1118 | // The local symbol value is stored in the second | |
1119 | // GOT entry. | |
1120 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1121 | // That set the GOT offset of the local symbol to | |
1122 | // point to the second entry, but we want it to | |
1123 | // point to the first. | |
1124 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1125 | got_offset); | |
1126 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1127 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1128 | } | |
c2b45e22 CC |
1129 | } |
1130 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1131 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1132 | break; |
1133 | ||
c2b45e22 CC |
1134 | case elfcpp::R_386_TLS_DESC_CALL: |
1135 | break; | |
1136 | ||
56622147 | 1137 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1138 | if (optimized_type == tls::TLSOPT_NONE) |
1139 | { | |
1140 | // Create a GOT entry for the module index. | |
94c4710f | 1141 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1142 | } |
1143 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1144 | unsupported_reloc_local(object, r_type); |
1145 | break; | |
1146 | ||
56622147 | 1147 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1148 | break; |
1149 | ||
56622147 ILT |
1150 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1151 | case elfcpp::R_386_TLS_IE_32: | |
1152 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1153 | layout->set_has_static_tls(); |
07f397ab ILT |
1154 | if (optimized_type == tls::TLSOPT_NONE) |
1155 | { | |
7bf1f802 ILT |
1156 | // For the R_386_TLS_IE relocation, we need to create a |
1157 | // dynamic relocation when building a shared library. | |
1158 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1159 | && parameters->options().shared()) |
7bf1f802 ILT |
1160 | { |
1161 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1162 | unsigned int r_sym |
1163 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1164 | rel_dyn->add_local_relative(object, r_sym, | |
1165 | elfcpp::R_386_RELATIVE, | |
1166 | output_section, data_shndx, | |
1167 | reloc.get_r_offset()); | |
7bf1f802 | 1168 | } |
07f397ab ILT |
1169 | // Create a GOT entry for the tp-relative offset. |
1170 | Output_data_got<32, false>* got | |
1171 | = target->got_section(symtab, layout); | |
1172 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1173 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1174 | ? elfcpp::R_386_TLS_TPOFF32 | |
1175 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1176 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1177 | ? GOT_TYPE_TLS_OFFSET | |
1178 | : GOT_TYPE_TLS_NOFFSET); | |
1179 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1180 | target->rel_dyn_section(layout), |
1181 | dyn_r_type); | |
07f397ab ILT |
1182 | } |
1183 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1184 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1185 | break; |
af6359d5 | 1186 | |
56622147 ILT |
1187 | case elfcpp::R_386_TLS_LE: // Local-exec |
1188 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1189 | layout->set_has_static_tls(); |
07f397ab | 1190 | if (output_is_shared) |
7bf1f802 ILT |
1191 | { |
1192 | // We need to create a dynamic relocation. | |
dceae3c1 | 1193 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1194 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1195 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1196 | ? elfcpp::R_386_TLS_TPOFF32 | |
1197 | : elfcpp::R_386_TLS_TPOFF); | |
1198 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1199 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1200 | data_shndx, reloc.get_r_offset()); | |
1201 | } | |
56622147 ILT |
1202 | break; |
1203 | ||
af6359d5 ILT |
1204 | default: |
1205 | gold_unreachable(); | |
7e1edb90 ILT |
1206 | } |
1207 | } | |
92e059d8 ILT |
1208 | break; |
1209 | ||
92e059d8 ILT |
1210 | case elfcpp::R_386_32PLT: |
1211 | case elfcpp::R_386_TLS_GD_32: | |
1212 | case elfcpp::R_386_TLS_GD_PUSH: | |
1213 | case elfcpp::R_386_TLS_GD_CALL: | |
1214 | case elfcpp::R_386_TLS_GD_POP: | |
1215 | case elfcpp::R_386_TLS_LDM_32: | |
1216 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1217 | case elfcpp::R_386_TLS_LDM_CALL: | |
1218 | case elfcpp::R_386_TLS_LDM_POP: | |
1219 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1220 | default: | |
af6359d5 | 1221 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1222 | break; |
1223 | } | |
1224 | } | |
1225 | ||
af6359d5 ILT |
1226 | // Report an unsupported relocation against a global symbol. |
1227 | ||
1228 | void | |
1229 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1230 | unsigned int r_type, | |
1231 | Symbol* gsym) | |
1232 | { | |
75f2446e | 1233 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1234 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1235 | } |
1236 | ||
92e059d8 ILT |
1237 | // Scan a relocation for a global symbol. |
1238 | ||
1239 | inline void | |
ad0f2072 | 1240 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1241 | Layout* layout, |
1242 | Target_i386* target, | |
f6ce93d6 | 1243 | Sized_relobj<32, false>* object, |
a3ad94ed | 1244 | unsigned int data_shndx, |
07f397ab | 1245 | Output_section* output_section, |
a3ad94ed ILT |
1246 | const elfcpp::Rel<32, false>& reloc, |
1247 | unsigned int r_type, | |
92e059d8 ILT |
1248 | Symbol* gsym) |
1249 | { | |
1250 | switch (r_type) | |
1251 | { | |
1252 | case elfcpp::R_386_NONE: | |
1253 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1254 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1255 | break; |
1256 | ||
1257 | case elfcpp::R_386_32: | |
92e059d8 | 1258 | case elfcpp::R_386_16: |
92e059d8 | 1259 | case elfcpp::R_386_8: |
96f2030e | 1260 | { |
d61c6bd4 ILT |
1261 | // Make a PLT entry if necessary. |
1262 | if (gsym->needs_plt_entry()) | |
1263 | { | |
1264 | target->make_plt_entry(symtab, layout, gsym); | |
1265 | // Since this is not a PC-relative relocation, we may be | |
1266 | // taking the address of a function. In that case we need to | |
1267 | // set the entry in the dynamic symbol table to the address of | |
1268 | // the PLT entry. | |
8851ecca | 1269 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1270 | gsym->set_needs_dynsym_value(); |
1271 | } | |
1272 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1273 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1274 | { |
966d4097 | 1275 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1276 | { |
12c0daef | 1277 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1278 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1279 | } |
1280 | else if (r_type == elfcpp::R_386_32 | |
1281 | && gsym->can_use_relative_reloc(false)) | |
1282 | { | |
1283 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1284 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1285 | output_section, object, | |
1286 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1287 | } |
1288 | else | |
1289 | { | |
96f2030e | 1290 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1291 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1292 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1293 | } |
1294 | } | |
1295 | } | |
1296 | break; | |
1297 | ||
1298 | case elfcpp::R_386_PC32: | |
1299 | case elfcpp::R_386_PC16: | |
1300 | case elfcpp::R_386_PC8: | |
1301 | { | |
1302 | // Make a PLT entry if necessary. | |
1303 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1304 | { |
1305 | // These relocations are used for function calls only in | |
1306 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1307 | // we'll need a text relocation anyway, so we can skip the | |
1308 | // PLT entry and let the dynamic linker bind the call directly | |
1309 | // to the target. For smaller relocations, we should use a | |
1310 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1311 | if (!parameters->options().shared() |
7bf1f802 ILT |
1312 | || r_type != elfcpp::R_386_PC32) |
1313 | target->make_plt_entry(symtab, layout, gsym); | |
1314 | } | |
d61c6bd4 | 1315 | // Make a dynamic relocation if necessary. |
0700cf32 | 1316 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1317 | if (gsym->is_func()) |
0700cf32 ILT |
1318 | flags |= Symbol::FUNCTION_CALL; |
1319 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1320 | { |
966d4097 | 1321 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1322 | { |
12c0daef | 1323 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1324 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1325 | } |
86849f1f | 1326 | else |
d61c6bd4 ILT |
1327 | { |
1328 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1329 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1330 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1331 | } |
96f2030e ILT |
1332 | } |
1333 | } | |
92e059d8 ILT |
1334 | break; |
1335 | ||
ead1e424 | 1336 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1337 | { |
1338 | // The symbol requires a GOT entry. | |
7e1edb90 | 1339 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1340 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1341 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1342 | else |
1343 | { | |
8462ae85 | 1344 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1345 | // GOT entry with a dynamic relocation. |
1346 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1347 | if (gsym->is_from_dynobj() |
1348 | || gsym->is_undefined() | |
1349 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1350 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1351 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1352 | else |
8462ae85 | 1353 | { |
0a65a3a7 CC |
1354 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1355 | rel_dyn->add_global_relative( | |
1356 | gsym, elfcpp::R_386_RELATIVE, got, | |
1357 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1358 | } |
1359 | } | |
1360 | } | |
ead1e424 ILT |
1361 | break; |
1362 | ||
1363 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1364 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1365 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1366 | if (gsym->final_value_is_known()) |
ead1e424 | 1367 | break; |
436ca963 ILT |
1368 | // If building a shared library, we can also skip the PLT entry |
1369 | // if the symbol is defined in the output file and is protected | |
1370 | // or hidden. | |
1371 | if (gsym->is_defined() | |
1372 | && !gsym->is_from_dynobj() | |
1373 | && !gsym->is_preemptible()) | |
1374 | break; | |
7e1edb90 | 1375 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1376 | break; |
1377 | ||
1378 | case elfcpp::R_386_GOTOFF: | |
1379 | case elfcpp::R_386_GOTPC: | |
1380 | // We need a GOT section. | |
7e1edb90 | 1381 | target->got_section(symtab, layout); |
ead1e424 ILT |
1382 | break; |
1383 | ||
af6359d5 ILT |
1384 | // These are relocations which should only be seen by the |
1385 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1386 | case elfcpp::R_386_COPY: |
1387 | case elfcpp::R_386_GLOB_DAT: | |
1388 | case elfcpp::R_386_JUMP_SLOT: | |
1389 | case elfcpp::R_386_RELATIVE: | |
1390 | case elfcpp::R_386_TLS_TPOFF: | |
1391 | case elfcpp::R_386_TLS_DTPMOD32: | |
1392 | case elfcpp::R_386_TLS_DTPOFF32: | |
1393 | case elfcpp::R_386_TLS_TPOFF32: | |
1394 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1395 | gold_error(_("%s: unexpected reloc %u in object file"), |
1396 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1397 | break; |
1398 | ||
d61c17ea ILT |
1399 | // These are initial tls relocs, which are expected when |
1400 | // linking. | |
56622147 ILT |
1401 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1402 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1403 | case elfcpp::R_386_TLS_DESC_CALL: | |
1404 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1405 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1406 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1407 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1408 | case elfcpp::R_386_TLS_GOTIE: |
1409 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1410 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1411 | { |
7e1edb90 | 1412 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1413 | const tls::Tls_optimization optimized_type |
1414 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1415 | switch (r_type) |
1416 | { | |
56622147 | 1417 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1418 | if (optimized_type == tls::TLSOPT_NONE) |
1419 | { | |
1420 | // Create a pair of GOT entries for the module index and | |
1421 | // dtv-relative offset. | |
1422 | Output_data_got<32, false>* got | |
1423 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1424 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1425 | target->rel_dyn_section(layout), |
1426 | elfcpp::R_386_TLS_DTPMOD32, | |
1427 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1428 | } |
1429 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1430 | { | |
1431 | // Create a GOT entry for the tp-relative offset. | |
1432 | Output_data_got<32, false>* got | |
1433 | = target->got_section(symtab, layout); | |
c2b45e22 | 1434 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1435 | target->rel_dyn_section(layout), |
c2b45e22 | 1436 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1437 | } |
1438 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1439 | unsupported_reloc_global(object, r_type, gsym); | |
1440 | break; | |
1441 | ||
56622147 | 1442 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1443 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1444 | if (optimized_type == tls::TLSOPT_NONE) |
1445 | { | |
1446 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1447 | Output_data_got<32, false>* got | |
1448 | = target->got_section(symtab, layout); | |
e291e7b9 ILT |
1449 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
1450 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1451 | elfcpp::R_386_TLS_DESC, 0); |
1452 | } | |
1453 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1454 | { | |
1455 | // Create a GOT entry for the tp-relative offset. | |
1456 | Output_data_got<32, false>* got | |
1457 | = target->got_section(symtab, layout); | |
1458 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1459 | target->rel_dyn_section(layout), | |
1460 | elfcpp::R_386_TLS_TPOFF); | |
1461 | } | |
1462 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1463 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1464 | break; |
1465 | ||
1466 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1467 | break; |
1468 | ||
56622147 | 1469 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1470 | if (optimized_type == tls::TLSOPT_NONE) |
1471 | { | |
1472 | // Create a GOT entry for the module index. | |
94c4710f | 1473 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1474 | } |
1475 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1476 | unsupported_reloc_global(object, r_type, gsym); |
1477 | break; | |
1478 | ||
56622147 | 1479 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1480 | break; |
1481 | ||
56622147 ILT |
1482 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1483 | case elfcpp::R_386_TLS_IE_32: | |
1484 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1485 | layout->set_has_static_tls(); |
07f397ab ILT |
1486 | if (optimized_type == tls::TLSOPT_NONE) |
1487 | { | |
7bf1f802 ILT |
1488 | // For the R_386_TLS_IE relocation, we need to create a |
1489 | // dynamic relocation when building a shared library. | |
1490 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1491 | && parameters->options().shared()) |
07f397ab | 1492 | { |
07f397ab | 1493 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1494 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1495 | output_section, object, | |
1496 | data_shndx, | |
1497 | reloc.get_r_offset()); | |
07f397ab | 1498 | } |
7bf1f802 ILT |
1499 | // Create a GOT entry for the tp-relative offset. |
1500 | Output_data_got<32, false>* got | |
1501 | = target->got_section(symtab, layout); | |
1502 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1503 | ? elfcpp::R_386_TLS_TPOFF32 | |
1504 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1505 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1506 | ? GOT_TYPE_TLS_OFFSET | |
1507 | : GOT_TYPE_TLS_NOFFSET); | |
1508 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1509 | target->rel_dyn_section(layout), |
1510 | dyn_r_type); | |
07f397ab ILT |
1511 | } |
1512 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1513 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1514 | break; |
af6359d5 | 1515 | |
56622147 ILT |
1516 | case elfcpp::R_386_TLS_LE: // Local-exec |
1517 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1518 | layout->set_has_static_tls(); |
8851ecca | 1519 | if (parameters->options().shared()) |
7bf1f802 ILT |
1520 | { |
1521 | // We need to create a dynamic relocation. | |
1522 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1523 | ? elfcpp::R_386_TLS_TPOFF32 | |
1524 | : elfcpp::R_386_TLS_TPOFF); | |
1525 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1526 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1527 | data_shndx, reloc.get_r_offset()); | |
1528 | } | |
56622147 ILT |
1529 | break; |
1530 | ||
af6359d5 ILT |
1531 | default: |
1532 | gold_unreachable(); | |
a3ad94ed ILT |
1533 | } |
1534 | } | |
92e059d8 ILT |
1535 | break; |
1536 | ||
92e059d8 ILT |
1537 | case elfcpp::R_386_32PLT: |
1538 | case elfcpp::R_386_TLS_GD_32: | |
1539 | case elfcpp::R_386_TLS_GD_PUSH: | |
1540 | case elfcpp::R_386_TLS_GD_CALL: | |
1541 | case elfcpp::R_386_TLS_GD_POP: | |
1542 | case elfcpp::R_386_TLS_LDM_32: | |
1543 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1544 | case elfcpp::R_386_TLS_LDM_CALL: | |
1545 | case elfcpp::R_386_TLS_LDM_POP: | |
1546 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1547 | default: | |
af6359d5 | 1548 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1549 | break; |
1550 | } | |
1551 | } | |
1552 | ||
6d03d481 ST |
1553 | // Process relocations for gc. |
1554 | ||
1555 | void | |
ad0f2072 | 1556 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1557 | Layout* layout, |
1558 | Sized_relobj<32, false>* object, | |
1559 | unsigned int data_shndx, | |
1560 | unsigned int, | |
1561 | const unsigned char* prelocs, | |
1562 | size_t reloc_count, | |
1563 | Output_section* output_section, | |
1564 | bool needs_special_offset_handling, | |
1565 | size_t local_symbol_count, | |
1566 | const unsigned char* plocal_symbols) | |
1567 | { | |
1568 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
1569 | Target_i386::Scan>( | |
6d03d481 ST |
1570 | symtab, |
1571 | layout, | |
1572 | this, | |
1573 | object, | |
1574 | data_shndx, | |
1575 | prelocs, | |
1576 | reloc_count, | |
1577 | output_section, | |
1578 | needs_special_offset_handling, | |
1579 | local_symbol_count, | |
1580 | plocal_symbols); | |
1581 | } | |
1582 | ||
92e059d8 ILT |
1583 | // Scan relocations for a section. |
1584 | ||
1585 | void | |
ad0f2072 | 1586 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 1587 | Layout* layout, |
f6ce93d6 | 1588 | Sized_relobj<32, false>* object, |
a3ad94ed | 1589 | unsigned int data_shndx, |
92e059d8 ILT |
1590 | unsigned int sh_type, |
1591 | const unsigned char* prelocs, | |
1592 | size_t reloc_count, | |
730cdc88 ILT |
1593 | Output_section* output_section, |
1594 | bool needs_special_offset_handling, | |
92e059d8 | 1595 | size_t local_symbol_count, |
730cdc88 | 1596 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1597 | { |
1598 | if (sh_type == elfcpp::SHT_RELA) | |
1599 | { | |
75f2446e ILT |
1600 | gold_error(_("%s: unsupported RELA reloc section"), |
1601 | object->name().c_str()); | |
1602 | return; | |
92e059d8 ILT |
1603 | } |
1604 | ||
ead1e424 ILT |
1605 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1606 | Target_i386::Scan>( | |
92e059d8 | 1607 | symtab, |
ead1e424 ILT |
1608 | layout, |
1609 | this, | |
92e059d8 | 1610 | object, |
a3ad94ed | 1611 | data_shndx, |
92e059d8 ILT |
1612 | prelocs, |
1613 | reloc_count, | |
730cdc88 ILT |
1614 | output_section, |
1615 | needs_special_offset_handling, | |
92e059d8 | 1616 | local_symbol_count, |
730cdc88 | 1617 | plocal_symbols); |
92e059d8 ILT |
1618 | } |
1619 | ||
16649710 | 1620 | // Finalize the sections. |
5a6f7e2d ILT |
1621 | |
1622 | void | |
f59f41f3 DK |
1623 | Target_i386::do_finalize_sections( |
1624 | Layout* layout, | |
1625 | const Input_objects*, | |
e785ec03 | 1626 | Symbol_table* symtab) |
5a6f7e2d | 1627 | { |
ea715a34 ILT |
1628 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1629 | ? NULL | |
1630 | : this->plt_->rel_plt()); | |
1631 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 1632 | this->rel_dyn_, true, false); |
16649710 ILT |
1633 | |
1634 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1635 | // relocs. | |
12c0daef ILT |
1636 | if (this->copy_relocs_.any_saved_relocs()) |
1637 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
1638 | |
1639 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
1640 | // the .got.plt section. | |
1641 | Symbol* sym = this->global_offset_table_; | |
1642 | if (sym != NULL) | |
1643 | { | |
1644 | uint32_t data_size = this->got_plt_->current_data_size(); | |
1645 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
1646 | } | |
5a6f7e2d ILT |
1647 | } |
1648 | ||
86849f1f ILT |
1649 | // Return whether a direct absolute static relocation needs to be applied. |
1650 | // In cases where Scan::local() or Scan::global() has created | |
1651 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1652 | // of the relocation is carried in the data, and we must not | |
1653 | // apply the static relocation. | |
1654 | ||
1655 | inline bool | |
1656 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1657 | int ref_flags, |
031cdbed ILT |
1658 | bool is_32bit, |
1659 | Output_section* output_section) | |
86849f1f | 1660 | { |
031cdbed ILT |
1661 | // If the output section is not allocated, then we didn't call |
1662 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1663 | // the reloc here. | |
1664 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1665 | return true; | |
1666 | ||
d61c6bd4 ILT |
1667 | // For local symbols, we will have created a non-RELATIVE dynamic |
1668 | // relocation only if (a) the output is position independent, | |
1669 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1670 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1671 | if (gsym == NULL) |
8851ecca | 1672 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1673 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1674 | && !is_32bit); |
86849f1f | 1675 | |
0700cf32 ILT |
1676 | // For global symbols, we use the same helper routines used in the |
1677 | // scan pass. If we did not create a dynamic relocation, or if we | |
1678 | // created a RELATIVE dynamic relocation, we should apply the static | |
1679 | // relocation. | |
1680 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1681 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1682 | && gsym->can_use_relative_reloc(ref_flags | |
1683 | & Symbol::FUNCTION_CALL); | |
1684 | return !has_dyn || is_rel; | |
86849f1f ILT |
1685 | } |
1686 | ||
61ba1cf9 ILT |
1687 | // Perform a relocation. |
1688 | ||
ead1e424 | 1689 | inline bool |
92e059d8 | 1690 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1691 | Target_i386* target, |
031cdbed | 1692 | Output_section *output_section, |
92e059d8 ILT |
1693 | size_t relnum, |
1694 | const elfcpp::Rel<32, false>& rel, | |
1695 | unsigned int r_type, | |
c06b7b0b | 1696 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1697 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1698 | unsigned char* view, |
1699 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1700 | section_size_type view_size) |
61ba1cf9 | 1701 | { |
ead1e424 ILT |
1702 | if (this->skip_call_tls_get_addr_) |
1703 | { | |
5efc7cd2 CC |
1704 | if ((r_type != elfcpp::R_386_PLT32 |
1705 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1706 | || gsym == NULL |
1707 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1708 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1709 | _("missing expected TLS relocation")); | |
1710 | else | |
ead1e424 | 1711 | { |
75f2446e ILT |
1712 | this->skip_call_tls_get_addr_ = false; |
1713 | return false; | |
ead1e424 | 1714 | } |
ead1e424 ILT |
1715 | } |
1716 | ||
a3ad94ed | 1717 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1718 | Symbol_value<32> symval; |
436ca963 | 1719 | if (gsym != NULL |
de4c45bd ILT |
1720 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1721 | || r_type == elfcpp::R_386_PC16 | |
1722 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1723 | { |
b8e6aad9 ILT |
1724 | symval.set_output_value(target->plt_section()->address() |
1725 | + gsym->plt_offset()); | |
1726 | psymval = &symval; | |
a3ad94ed ILT |
1727 | } |
1728 | ||
b8e6aad9 ILT |
1729 | const Sized_relobj<32, false>* object = relinfo->object; |
1730 | ||
1b64748b | 1731 | // Get the GOT offset if needed. |
96f2030e ILT |
1732 | // The GOT pointer points to the end of the GOT section. |
1733 | // We need to subtract the size of the GOT section to get | |
1734 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1735 | bool have_got_offset = false; |
1736 | unsigned int got_offset = 0; | |
1737 | switch (r_type) | |
1738 | { | |
1739 | case elfcpp::R_386_GOT32: | |
1740 | if (gsym != NULL) | |
1741 | { | |
0a65a3a7 CC |
1742 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1743 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1744 | - target->got_size()); | |
1b64748b ILT |
1745 | } |
1746 | else | |
1747 | { | |
1748 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1749 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1750 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1751 | - target->got_size()); | |
1b64748b ILT |
1752 | } |
1753 | have_got_offset = true; | |
1754 | break; | |
1755 | ||
1756 | default: | |
1757 | break; | |
1758 | } | |
1759 | ||
61ba1cf9 ILT |
1760 | switch (r_type) |
1761 | { | |
1762 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1763 | case elfcpp::R_386_GNU_VTINHERIT: |
1764 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1765 | break; |
1766 | ||
1767 | case elfcpp::R_386_32: | |
031cdbed ILT |
1768 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1769 | output_section)) | |
86849f1f | 1770 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1771 | break; |
1772 | ||
1773 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1774 | { |
0700cf32 | 1775 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1776 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1777 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1778 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1779 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1780 | } | |
92e059d8 ILT |
1781 | break; |
1782 | ||
1783 | case elfcpp::R_386_16: | |
031cdbed ILT |
1784 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1785 | output_section)) | |
86849f1f | 1786 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1787 | break; |
1788 | ||
1789 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1790 | { |
0700cf32 | 1791 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1792 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1793 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1794 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1795 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1796 | } |
61ba1cf9 ILT |
1797 | break; |
1798 | ||
92e059d8 | 1799 | case elfcpp::R_386_8: |
031cdbed ILT |
1800 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1801 | output_section)) | |
86849f1f | 1802 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1803 | break; |
1804 | ||
1805 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1806 | { |
0700cf32 | 1807 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1808 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1809 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed ILT |
1810 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1811 | output_section)) | |
d09e9154 | 1812 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1813 | } |
92e059d8 ILT |
1814 | break; |
1815 | ||
ead1e424 | 1816 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1817 | gold_assert(gsym == NULL |
1818 | || gsym->has_plt_offset() | |
99f8faca ILT |
1819 | || gsym->final_value_is_known() |
1820 | || (gsym->is_defined() | |
1821 | && !gsym->is_from_dynobj() | |
1822 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1823 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1824 | break; |
1825 | ||
1826 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1827 | gold_assert(have_got_offset); |
1828 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1829 | break; |
1830 | ||
1831 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1832 | { |
1833 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1834 | value = (psymval->value(object, 0) | |
96f2030e | 1835 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1836 | Relocate_functions<32, false>::rel32(view, value); |
1837 | } | |
ead1e424 ILT |
1838 | break; |
1839 | ||
1840 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1841 | { |
1842 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1843 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1844 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1845 | } | |
ead1e424 ILT |
1846 | break; |
1847 | ||
92e059d8 ILT |
1848 | case elfcpp::R_386_COPY: |
1849 | case elfcpp::R_386_GLOB_DAT: | |
1850 | case elfcpp::R_386_JUMP_SLOT: | |
1851 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1852 | // These are outstanding tls relocs, which are unexpected when |
1853 | // linking. | |
92e059d8 ILT |
1854 | case elfcpp::R_386_TLS_TPOFF: |
1855 | case elfcpp::R_386_TLS_DTPMOD32: | |
1856 | case elfcpp::R_386_TLS_DTPOFF32: | |
1857 | case elfcpp::R_386_TLS_TPOFF32: | |
1858 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1859 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1860 | _("unexpected reloc %u in object file"), | |
1861 | r_type); | |
92e059d8 ILT |
1862 | break; |
1863 | ||
d61c17ea ILT |
1864 | // These are initial tls relocs, which are expected when |
1865 | // linking. | |
56622147 ILT |
1866 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1867 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1868 | case elfcpp::R_386_TLS_DESC_CALL: | |
1869 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1870 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1871 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1872 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1873 | case elfcpp::R_386_TLS_GOTIE: |
1874 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1875 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1876 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1877 | view, address, view_size); | |
92e059d8 ILT |
1878 | break; |
1879 | ||
92e059d8 ILT |
1880 | case elfcpp::R_386_32PLT: |
1881 | case elfcpp::R_386_TLS_GD_32: | |
1882 | case elfcpp::R_386_TLS_GD_PUSH: | |
1883 | case elfcpp::R_386_TLS_GD_CALL: | |
1884 | case elfcpp::R_386_TLS_GD_POP: | |
1885 | case elfcpp::R_386_TLS_LDM_32: | |
1886 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1887 | case elfcpp::R_386_TLS_LDM_CALL: | |
1888 | case elfcpp::R_386_TLS_LDM_POP: | |
1889 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1890 | default: |
75f2446e ILT |
1891 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1892 | _("unsupported reloc %u"), | |
1893 | r_type); | |
92e059d8 ILT |
1894 | break; |
1895 | } | |
ead1e424 ILT |
1896 | |
1897 | return true; | |
92e059d8 ILT |
1898 | } |
1899 | ||
1900 | // Perform a TLS relocation. | |
1901 | ||
1902 | inline void | |
1903 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1904 | Target_i386* target, |
92e059d8 ILT |
1905 | size_t relnum, |
1906 | const elfcpp::Rel<32, false>& rel, | |
1907 | unsigned int r_type, | |
c06b7b0b | 1908 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1909 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1910 | unsigned char* view, |
1911 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1912 | section_size_type view_size) |
92e059d8 ILT |
1913 | { |
1914 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1915 | |
07f397ab ILT |
1916 | const Sized_relobj<32, false>* object = relinfo->object; |
1917 | ||
1918 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1919 | |
b3705d2a ILT |
1920 | const bool is_final = (gsym == NULL |
1921 | ? !parameters->options().shared() | |
1922 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1923 | const tls::Tls_optimization optimized_type |
1924 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1925 | switch (r_type) |
1926 | { | |
56622147 | 1927 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1928 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1929 | { |
07f397ab | 1930 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1931 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1932 | rel, r_type, value, view, | |
1933 | view_size); | |
92e059d8 ILT |
1934 | break; |
1935 | } | |
07f397ab ILT |
1936 | else |
1937 | { | |
c2b45e22 CC |
1938 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1939 | ? GOT_TYPE_TLS_NOFFSET | |
1940 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1941 | unsigned int got_offset; |
1942 | if (gsym != NULL) | |
1943 | { | |
c2b45e22 CC |
1944 | gold_assert(gsym->has_got_offset(got_type)); |
1945 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1946 | } |
1947 | else | |
1948 | { | |
1949 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1950 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1951 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1952 | - target->got_size()); |
1953 | } | |
1954 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1955 | { | |
1956 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1957 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1958 | got_offset, view, view_size); | |
07f397ab ILT |
1959 | break; |
1960 | } | |
1961 | else if (optimized_type == tls::TLSOPT_NONE) | |
1962 | { | |
1963 | // Relocate the field with the offset of the pair of GOT | |
1964 | // entries. | |
1965 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1966 | break; | |
1967 | } | |
1968 | } | |
75f2446e ILT |
1969 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1970 | _("unsupported reloc %u"), | |
1971 | r_type); | |
92e059d8 ILT |
1972 | break; |
1973 | ||
56622147 ILT |
1974 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1975 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 1976 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1977 | if (optimized_type == tls::TLSOPT_TO_LE) |
1978 | { | |
1979 | gold_assert(tls_segment != NULL); | |
1980 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1981 | rel, r_type, value, view, | |
1982 | view_size); | |
1983 | break; | |
1984 | } | |
1985 | else | |
1986 | { | |
1987 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1988 | ? GOT_TYPE_TLS_NOFFSET | |
1989 | : GOT_TYPE_TLS_DESC); | |
1990 | unsigned int got_offset; | |
1991 | if (gsym != NULL) | |
1992 | { | |
1993 | gold_assert(gsym->has_got_offset(got_type)); | |
1994 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1995 | } | |
1996 | else | |
1997 | { | |
1998 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1999 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2000 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2001 | - target->got_size()); | |
2002 | } | |
2003 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2004 | { | |
2005 | gold_assert(tls_segment != NULL); | |
2006 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2007 | got_offset, view, view_size); | |
2008 | break; | |
2009 | } | |
2010 | else if (optimized_type == tls::TLSOPT_NONE) | |
2011 | { | |
2012 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2013 | { | |
2014 | // Relocate the field with the offset of the pair of GOT | |
2015 | // entries. | |
2016 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2017 | } | |
2018 | break; | |
2019 | } | |
2020 | } | |
75f2446e ILT |
2021 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2022 | _("unsupported reloc %u"), | |
2023 | r_type); | |
ead1e424 ILT |
2024 | break; |
2025 | ||
56622147 | 2026 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2027 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2028 | { | |
75f2446e ILT |
2029 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2030 | _("both SUN and GNU model " | |
2031 | "TLS relocations")); | |
2032 | break; | |
46cf9fa2 ILT |
2033 | } |
2034 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2035 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2036 | { |
07f397ab | 2037 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2038 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2039 | value, view, view_size); | |
2040 | break; | |
2041 | } | |
07f397ab ILT |
2042 | else if (optimized_type == tls::TLSOPT_NONE) |
2043 | { | |
2044 | // Relocate the field with the offset of the GOT entry for | |
2045 | // the module index. | |
2046 | unsigned int got_offset; | |
94c4710f ILT |
2047 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2048 | - target->got_size()); | |
07f397ab ILT |
2049 | Relocate_functions<32, false>::rel32(view, got_offset); |
2050 | break; | |
2051 | } | |
75f2446e ILT |
2052 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2053 | _("unsupported reloc %u"), | |
2054 | r_type); | |
46cf9fa2 ILT |
2055 | break; |
2056 | ||
56622147 | 2057 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2058 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2059 | { |
82bb573a ILT |
2060 | // This reloc can appear in debugging sections, in which |
2061 | // case we must not convert to local-exec. We decide what | |
2062 | // to do based on whether the section is marked as | |
2063 | // containing executable code. That is what the GNU linker | |
2064 | // does as well. | |
2065 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2066 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2067 | { |
2068 | gold_assert(tls_segment != NULL); | |
2069 | value -= tls_segment->memsz(); | |
2070 | } | |
e8a9fcda | 2071 | } |
46cf9fa2 ILT |
2072 | Relocate_functions<32, false>::rel32(view, value); |
2073 | break; | |
2074 | ||
56622147 ILT |
2075 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2076 | case elfcpp::R_386_TLS_GOTIE: | |
2077 | case elfcpp::R_386_TLS_IE_32: | |
2078 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2079 | { | |
07f397ab | 2080 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2081 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2082 | rel, r_type, value, view, | |
2083 | view_size); | |
2084 | break; | |
2085 | } | |
07f397ab ILT |
2086 | else if (optimized_type == tls::TLSOPT_NONE) |
2087 | { | |
2088 | // Relocate the field with the offset of the GOT entry for | |
2089 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2090 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2091 | ? GOT_TYPE_TLS_OFFSET | |
2092 | : GOT_TYPE_TLS_NOFFSET); | |
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); | |
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 | } |
2105 | // For the R_386_TLS_IE relocation, we need to apply the | |
2106 | // absolute address of the GOT entry. | |
2107 | if (r_type == elfcpp::R_386_TLS_IE) | |
2108 | got_offset += target->got_plt_section()->address(); | |
2109 | // All GOT offsets are relative to the end of the GOT. | |
2110 | got_offset -= target->got_size(); | |
2111 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2112 | break; | |
2113 | } | |
75f2446e ILT |
2114 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2115 | _("unsupported reloc %u"), | |
2116 | r_type); | |
92e059d8 | 2117 | break; |
92e059d8 | 2118 | |
56622147 | 2119 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2120 | // If we're creating a shared library, a dynamic relocation will |
2121 | // have been created for this location, so do not apply it now. | |
8851ecca | 2122 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2123 | { |
2124 | gold_assert(tls_segment != NULL); | |
2125 | value -= tls_segment->memsz(); | |
2126 | Relocate_functions<32, false>::rel32(view, value); | |
2127 | } | |
56622147 | 2128 | break; |
92e059d8 | 2129 | |
56622147 | 2130 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2131 | // If we're creating a shared library, a dynamic relocation will |
2132 | // have been created for this location, so do not apply it now. | |
8851ecca | 2133 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2134 | { |
2135 | gold_assert(tls_segment != NULL); | |
2136 | value = tls_segment->memsz() - value; | |
2137 | Relocate_functions<32, false>::rel32(view, value); | |
2138 | } | |
56622147 | 2139 | break; |
92e059d8 | 2140 | } |
92e059d8 ILT |
2141 | } |
2142 | ||
e041f13d | 2143 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2144 | // Local-Exec. |
2145 | ||
2146 | inline void | |
2147 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2148 | size_t relnum, | |
2149 | Output_segment* tls_segment, | |
2150 | const elfcpp::Rel<32, false>& rel, | |
2151 | unsigned int, | |
2152 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2153 | unsigned char* view, | |
fe8718a4 | 2154 | section_size_type view_size) |
ead1e424 ILT |
2155 | { |
2156 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2157 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2158 | // leal foo(%reg),%eax; call ___tls_get_addr |
2159 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2160 | ||
af6359d5 ILT |
2161 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2162 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2163 | |
2164 | unsigned char op1 = view[-1]; | |
2165 | unsigned char op2 = view[-2]; | |
2166 | ||
af6359d5 ILT |
2167 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2168 | op2 == 0x8d || op2 == 0x04); | |
2169 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2170 | |
2171 | int roff = 5; | |
2172 | ||
2173 | if (op2 == 0x04) | |
2174 | { | |
af6359d5 ILT |
2175 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2176 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2177 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2178 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2179 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2180 | } | |
2181 | else | |
2182 | { | |
af6359d5 ILT |
2183 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2184 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2185 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2186 | && view[9] == 0x90) |
ead1e424 ILT |
2187 | { |
2188 | // There is a trailing nop. Use the size byte subl. | |
2189 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2190 | roff = 6; | |
2191 | } | |
2192 | else | |
2193 | { | |
2194 | // Use the five byte subl. | |
2195 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2196 | } | |
2197 | } | |
2198 | ||
7bf1f802 | 2199 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2200 | Relocate_functions<32, false>::rel32(view + roff, value); |
2201 | ||
2202 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2203 | // We can skip it. | |
2204 | this->skip_call_tls_get_addr_ = true; | |
2205 | } | |
2206 | ||
7bf1f802 | 2207 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2208 | // Initial-Exec. |
2209 | ||
2210 | inline void | |
2211 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2212 | size_t relnum, | |
c2b45e22 | 2213 | Output_segment*, |
07f397ab ILT |
2214 | const elfcpp::Rel<32, false>& rel, |
2215 | unsigned int, | |
2216 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2217 | unsigned char* view, | |
fe8718a4 | 2218 | section_size_type view_size) |
07f397ab ILT |
2219 | { |
2220 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2221 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2222 | ||
2223 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2224 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2225 | ||
2226 | unsigned char op1 = view[-1]; | |
2227 | unsigned char op2 = view[-2]; | |
2228 | ||
2229 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2230 | op2 == 0x8d || op2 == 0x04); | |
2231 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2232 | ||
2233 | int roff = 5; | |
2234 | ||
c2b45e22 CC |
2235 | // FIXME: For now, support only the first (SIB) form. |
2236 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2237 | |
2238 | if (op2 == 0x04) | |
2239 | { | |
2240 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2241 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2242 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2243 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2244 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2245 | } | |
2246 | else | |
2247 | { | |
2248 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2249 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2250 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2251 | && view[9] == 0x90) |
2252 | { | |
2253 | // FIXME: This is not the right instruction sequence. | |
2254 | // There is a trailing nop. Use the size byte subl. | |
2255 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2256 | roff = 6; | |
2257 | } | |
2258 | else | |
2259 | { | |
2260 | // FIXME: This is not the right instruction sequence. | |
2261 | // Use the five byte subl. | |
2262 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2263 | } | |
2264 | } | |
2265 | ||
07f397ab ILT |
2266 | Relocate_functions<32, false>::rel32(view + roff, value); |
2267 | ||
2268 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2269 | // We can skip it. | |
2270 | this->skip_call_tls_get_addr_ = true; | |
2271 | } | |
2272 | ||
c2b45e22 CC |
2273 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2274 | // General-Dynamic to a Local-Exec. | |
2275 | ||
2276 | inline void | |
2277 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2278 | const Relocate_info<32, false>* relinfo, | |
2279 | size_t relnum, | |
2280 | Output_segment* tls_segment, | |
2281 | const elfcpp::Rel<32, false>& rel, | |
2282 | unsigned int r_type, | |
2283 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2284 | unsigned char* view, | |
2285 | section_size_type view_size) | |
2286 | { | |
2287 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2288 | { | |
2289 | // leal foo@TLSDESC(%ebx), %eax | |
2290 | // ==> leal foo@NTPOFF, %eax | |
2291 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2292 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2293 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2294 | view[-2] == 0x8d && view[-1] == 0x83); | |
2295 | view[-1] = 0x05; | |
2296 | value -= tls_segment->memsz(); | |
2297 | Relocate_functions<32, false>::rel32(view, value); | |
2298 | } | |
2299 | else | |
2300 | { | |
2301 | // call *foo@TLSCALL(%eax) | |
2302 | // ==> nop; nop | |
2303 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2304 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2305 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2306 | view[0] == 0xff && view[1] == 0x10); | |
2307 | view[0] = 0x66; | |
2308 | view[1] = 0x90; | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2313 | // General-Dynamic to an Initial-Exec. | |
2314 | ||
2315 | inline void | |
2316 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2317 | const Relocate_info<32, false>* relinfo, | |
2318 | size_t relnum, | |
2319 | Output_segment*, | |
2320 | const elfcpp::Rel<32, false>& rel, | |
2321 | unsigned int r_type, | |
2322 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2323 | unsigned char* view, | |
2324 | section_size_type view_size) | |
2325 | { | |
2326 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2327 | { | |
2328 | // leal foo@TLSDESC(%ebx), %eax | |
2329 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2330 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2331 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2332 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2333 | view[-2] == 0x8d && view[-1] == 0x83); | |
2334 | view[-2] = 0x8b; | |
2335 | Relocate_functions<32, false>::rel32(view, value); | |
2336 | } | |
2337 | else | |
2338 | { | |
2339 | // call *foo@TLSCALL(%eax) | |
2340 | // ==> nop; nop | |
2341 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2342 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2343 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2344 | view[0] == 0xff && view[1] == 0x10); | |
2345 | view[0] = 0x66; | |
2346 | view[1] = 0x90; | |
2347 | } | |
2348 | } | |
2349 | ||
46cf9fa2 ILT |
2350 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2351 | // Local-Exec. | |
2352 | ||
2353 | inline void | |
2354 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2355 | size_t relnum, | |
2356 | Output_segment*, | |
2357 | const elfcpp::Rel<32, false>& rel, | |
2358 | unsigned int, | |
2359 | elfcpp::Elf_types<32>::Elf_Addr, | |
2360 | unsigned char* view, | |
fe8718a4 | 2361 | section_size_type view_size) |
46cf9fa2 ILT |
2362 | { |
2363 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2364 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2365 | ||
af6359d5 ILT |
2366 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2367 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2368 | |
2369 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2370 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2371 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2372 | |
af6359d5 | 2373 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2374 | |
2375 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2376 | ||
2377 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2378 | // We can skip it. | |
2379 | this->skip_call_tls_get_addr_ = true; | |
2380 | } | |
2381 | ||
56622147 ILT |
2382 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2383 | // Local-Exec. | |
2384 | ||
2385 | inline void | |
2386 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2387 | size_t relnum, | |
2388 | Output_segment* tls_segment, | |
2389 | const elfcpp::Rel<32, false>& rel, | |
2390 | unsigned int r_type, | |
2391 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2392 | unsigned char* view, | |
fe8718a4 | 2393 | section_size_type view_size) |
56622147 ILT |
2394 | { |
2395 | // We have to actually change the instructions, which means that we | |
2396 | // need to examine the opcodes to figure out which instruction we | |
2397 | // are looking at. | |
2398 | if (r_type == elfcpp::R_386_TLS_IE) | |
2399 | { | |
2400 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2401 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2402 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2403 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2404 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2405 | ||
2406 | unsigned char op1 = view[-1]; | |
2407 | if (op1 == 0xa1) | |
2408 | { | |
2409 | // movl XX,%eax ==> movl $YY,%eax | |
2410 | view[-1] = 0xb8; | |
2411 | } | |
2412 | else | |
2413 | { | |
2414 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2415 | ||
2416 | unsigned char op2 = view[-2]; | |
2417 | if (op2 == 0x8b) | |
2418 | { | |
2419 | // movl XX,%reg ==> movl $YY,%reg | |
2420 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2421 | (op1 & 0xc7) == 0x05); | |
2422 | view[-2] = 0xc7; | |
2423 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2424 | } | |
2425 | else if (op2 == 0x03) | |
2426 | { | |
2427 | // addl XX,%reg ==> addl $YY,%reg | |
2428 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2429 | (op1 & 0xc7) == 0x05); | |
2430 | view[-2] = 0x81; | |
2431 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2432 | } | |
2433 | else | |
2434 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2435 | } | |
2436 | } | |
2437 | else | |
2438 | { | |
2439 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2440 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2441 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2442 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2443 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2444 | ||
2445 | unsigned char op1 = view[-1]; | |
2446 | unsigned char op2 = view[-2]; | |
2447 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2448 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2449 | if (op2 == 0x8b) | |
2450 | { | |
2451 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2452 | view[-2] = 0xc7; | |
2453 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2454 | } | |
2455 | else if (op2 == 0x2b) | |
2456 | { | |
2457 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2458 | view[-2] = 0x81; | |
2459 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2460 | } | |
2461 | else if (op2 == 0x03) | |
2462 | { | |
2463 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2464 | view[-2] = 0x81; | |
2465 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2466 | } | |
2467 | else | |
2468 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2469 | } | |
2470 | ||
7bf1f802 | 2471 | value = tls_segment->memsz() - value; |
56622147 ILT |
2472 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2473 | value = - value; | |
2474 | ||
2475 | Relocate_functions<32, false>::rel32(view, value); | |
2476 | } | |
2477 | ||
61ba1cf9 ILT |
2478 | // Relocate section data. |
2479 | ||
2480 | void | |
92e059d8 | 2481 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2482 | unsigned int sh_type, |
2483 | const unsigned char* prelocs, | |
2484 | size_t reloc_count, | |
730cdc88 ILT |
2485 | Output_section* output_section, |
2486 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2487 | unsigned char* view, |
2488 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2489 | section_size_type view_size, |
2490 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2491 | { |
a3ad94ed | 2492 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2493 | |
ead1e424 ILT |
2494 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2495 | Target_i386::Relocate>( | |
92e059d8 | 2496 | relinfo, |
ead1e424 | 2497 | this, |
61ba1cf9 ILT |
2498 | prelocs, |
2499 | reloc_count, | |
730cdc88 ILT |
2500 | output_section, |
2501 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2502 | view, |
2503 | address, | |
364c7fa5 ILT |
2504 | view_size, |
2505 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2506 | } |
2507 | ||
6a74a719 ILT |
2508 | // Return the size of a relocation while scanning during a relocatable |
2509 | // link. | |
2510 | ||
2511 | unsigned int | |
2512 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2513 | unsigned int r_type, | |
2514 | Relobj* object) | |
2515 | { | |
2516 | switch (r_type) | |
2517 | { | |
2518 | case elfcpp::R_386_NONE: | |
2519 | case elfcpp::R_386_GNU_VTINHERIT: | |
2520 | case elfcpp::R_386_GNU_VTENTRY: | |
2521 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2522 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2523 | case elfcpp::R_386_TLS_DESC_CALL: | |
2524 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2525 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2526 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2527 | case elfcpp::R_386_TLS_IE_32: | |
2528 | case elfcpp::R_386_TLS_GOTIE: | |
2529 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2530 | case elfcpp::R_386_TLS_LE_32: | |
2531 | return 0; | |
2532 | ||
2533 | case elfcpp::R_386_32: | |
2534 | case elfcpp::R_386_PC32: | |
2535 | case elfcpp::R_386_GOT32: | |
2536 | case elfcpp::R_386_PLT32: | |
2537 | case elfcpp::R_386_GOTOFF: | |
2538 | case elfcpp::R_386_GOTPC: | |
2539 | return 4; | |
2540 | ||
2541 | case elfcpp::R_386_16: | |
2542 | case elfcpp::R_386_PC16: | |
2543 | return 2; | |
2544 | ||
2545 | case elfcpp::R_386_8: | |
2546 | case elfcpp::R_386_PC8: | |
2547 | return 1; | |
2548 | ||
2549 | // These are relocations which should only be seen by the | |
2550 | // dynamic linker, and should never be seen here. | |
2551 | case elfcpp::R_386_COPY: | |
2552 | case elfcpp::R_386_GLOB_DAT: | |
2553 | case elfcpp::R_386_JUMP_SLOT: | |
2554 | case elfcpp::R_386_RELATIVE: | |
2555 | case elfcpp::R_386_TLS_TPOFF: | |
2556 | case elfcpp::R_386_TLS_DTPMOD32: | |
2557 | case elfcpp::R_386_TLS_DTPOFF32: | |
2558 | case elfcpp::R_386_TLS_TPOFF32: | |
2559 | case elfcpp::R_386_TLS_DESC: | |
2560 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2561 | return 0; | |
2562 | ||
2563 | case elfcpp::R_386_32PLT: | |
2564 | case elfcpp::R_386_TLS_GD_32: | |
2565 | case elfcpp::R_386_TLS_GD_PUSH: | |
2566 | case elfcpp::R_386_TLS_GD_CALL: | |
2567 | case elfcpp::R_386_TLS_GD_POP: | |
2568 | case elfcpp::R_386_TLS_LDM_32: | |
2569 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2570 | case elfcpp::R_386_TLS_LDM_CALL: | |
2571 | case elfcpp::R_386_TLS_LDM_POP: | |
2572 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2573 | default: | |
2574 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2575 | return 0; | |
2576 | } | |
2577 | } | |
2578 | ||
2579 | // Scan the relocs during a relocatable link. | |
2580 | ||
2581 | void | |
ad0f2072 | 2582 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2583 | Layout* layout, |
2584 | Sized_relobj<32, false>* object, | |
2585 | unsigned int data_shndx, | |
2586 | unsigned int sh_type, | |
2587 | const unsigned char* prelocs, | |
2588 | size_t reloc_count, | |
2589 | Output_section* output_section, | |
2590 | bool needs_special_offset_handling, | |
2591 | size_t local_symbol_count, | |
2592 | const unsigned char* plocal_symbols, | |
2593 | Relocatable_relocs* rr) | |
2594 | { | |
2595 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2596 | ||
2597 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2598 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2599 | ||
7019cd25 | 2600 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 2601 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2602 | symtab, |
2603 | layout, | |
2604 | object, | |
2605 | data_shndx, | |
2606 | prelocs, | |
2607 | reloc_count, | |
2608 | output_section, | |
2609 | needs_special_offset_handling, | |
2610 | local_symbol_count, | |
2611 | plocal_symbols, | |
2612 | rr); | |
2613 | } | |
2614 | ||
2615 | // Relocate a section during a relocatable link. | |
2616 | ||
2617 | void | |
2618 | Target_i386::relocate_for_relocatable( | |
2619 | const Relocate_info<32, false>* relinfo, | |
2620 | unsigned int sh_type, | |
2621 | const unsigned char* prelocs, | |
2622 | size_t reloc_count, | |
2623 | Output_section* output_section, | |
2624 | off_t offset_in_output_section, | |
2625 | const Relocatable_relocs* rr, | |
2626 | unsigned char* view, | |
2627 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2628 | section_size_type view_size, | |
2629 | unsigned char* reloc_view, | |
2630 | section_size_type reloc_view_size) | |
2631 | { | |
2632 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2633 | ||
7019cd25 | 2634 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2635 | relinfo, |
2636 | prelocs, | |
2637 | reloc_count, | |
2638 | output_section, | |
2639 | offset_in_output_section, | |
2640 | rr, | |
2641 | view, | |
2642 | view_address, | |
2643 | view_size, | |
2644 | reloc_view, | |
2645 | reloc_view_size); | |
2646 | } | |
2647 | ||
ab5c9e90 ILT |
2648 | // Return the value to use for a dynamic which requires special |
2649 | // treatment. This is how we support equality comparisons of function | |
2650 | // pointers across shared library boundaries, as described in the | |
2651 | // processor specific ABI supplement. | |
2652 | ||
2653 | uint64_t | |
2654 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2655 | { | |
2656 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2657 | return this->plt_section()->address() + gsym->plt_offset(); | |
2658 | } | |
2659 | ||
c51e6221 ILT |
2660 | // Return a string used to fill a code section with nops to take up |
2661 | // the specified length. | |
2662 | ||
2663 | std::string | |
8851ecca | 2664 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2665 | { |
2666 | if (length >= 16) | |
2667 | { | |
2668 | // Build a jmp instruction to skip over the bytes. | |
2669 | unsigned char jmp[5]; | |
2670 | jmp[0] = 0xe9; | |
2671 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2672 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2673 | + std::string(length - 5, '\0')); | |
2674 | } | |
2675 | ||
2676 | // Nop sequences of various lengths. | |
2677 | const char nop1[1] = { 0x90 }; // nop | |
2678 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2679 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2680 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2681 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2682 | 0x00 }; // leal 0(%esi,1),%esi | |
2683 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2684 | 0x00, 0x00 }; | |
2685 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2686 | 0x00, 0x00, 0x00 }; | |
2687 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2688 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2689 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2690 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2691 | 0x00 }; | |
2692 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2693 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2694 | 0x00, 0x00 }; | |
2695 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2696 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2697 | 0x00, 0x00, 0x00 }; | |
2698 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2699 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2700 | 0x00, 0x00, 0x00, 0x00 }; | |
2701 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2702 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2703 | 0x27, 0x00, 0x00, 0x00, | |
2704 | 0x00 }; | |
2705 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2706 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2707 | 0xbc, 0x27, 0x00, 0x00, | |
2708 | 0x00, 0x00 }; | |
2709 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2710 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2711 | 0x90, 0x90, 0x90, 0x90, | |
2712 | 0x90, 0x90, 0x90 }; | |
2713 | ||
2714 | const char* nops[16] = { | |
2715 | NULL, | |
2716 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2717 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2718 | }; | |
2719 | ||
2720 | return std::string(nops[length], length); | |
2721 | } | |
2722 | ||
364c7fa5 ILT |
2723 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2724 | // compiled with -fstack-split. The function calls non-stack-split | |
2725 | // code. We have to change the function so that it always ensures | |
2726 | // that it has enough stack space to run some random function. | |
2727 | ||
2728 | void | |
2729 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2730 | section_offset_type fnoffset, | |
2731 | section_size_type fnsize, | |
2732 | unsigned char* view, | |
2733 | section_size_type view_size, | |
2734 | std::string* from, | |
2735 | std::string* to) const | |
2736 | { | |
2737 | // The function starts with a comparison of the stack pointer and a | |
2738 | // field in the TCB. This is followed by a jump. | |
2739 | ||
2740 | // cmp %gs:NN,%esp | |
2741 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
2742 | && fnsize > 7) | |
2743 | { | |
2744 | // We will call __morestack if the carry flag is set after this | |
2745 | // comparison. We turn the comparison into an stc instruction | |
2746 | // and some nops. | |
2747 | view[fnoffset] = '\xf9'; | |
2748 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
2749 | } | |
2750 | // lea NN(%esp),%ecx | |
1782c879 ILT |
2751 | // lea NN(%esp),%edx |
2752 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
2753 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
2754 | && fnsize > 7) |
2755 | { | |
2756 | // This is loading an offset from the stack pointer for a | |
2757 | // comparison. The offset is negative, so we decrease the | |
2758 | // offset by the amount of space we need for the stack. This | |
2759 | // means we will avoid calling __morestack if there happens to | |
2760 | // be plenty of space on the stack already. | |
2761 | unsigned char* pval = view + fnoffset + 3; | |
2762 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2763 | val -= parameters->options().split_stack_adjust_size(); | |
2764 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2765 | } | |
2766 | else | |
2767 | { | |
2768 | if (!object->has_no_split_stack()) | |
2769 | object->error(_("failed to match split-stack sequence at " | |
2770 | "section %u offset %0zx"), | |
ac33a407 | 2771 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2772 | return; |
2773 | } | |
2774 | ||
2775 | // We have to change the function so that it calls | |
2776 | // __morestack_non_split instead of __morestack. The former will | |
2777 | // allocate additional stack space. | |
2778 | *from = "__morestack"; | |
2779 | *to = "__morestack_non_split"; | |
2780 | } | |
2781 | ||
14bfc3f5 ILT |
2782 | // The selector for i386 object files. |
2783 | ||
36959681 | 2784 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
2785 | { |
2786 | public: | |
2787 | Target_selector_i386() | |
36959681 ILT |
2788 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
2789 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
2790 | { } |
2791 | ||
2792 | Target* | |
e96caa79 ILT |
2793 | do_instantiate_target() |
2794 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2795 | }; |
2796 | ||
14bfc3f5 ILT |
2797 | Target_selector_i386 target_selector_i386; |
2798 | ||
2799 | } // End anonymous namespace. |