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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" |
14bfc3f5 ILT |
40 | |
41 | namespace | |
42 | { | |
43 | ||
44 | using namespace gold; | |
45 | ||
a3ad94ed ILT |
46 | class Output_data_plt_i386; |
47 | ||
14bfc3f5 | 48 | // The i386 target class. |
e041f13d ILT |
49 | // TLS info comes from |
50 | // http://people.redhat.com/drepper/tls.pdf | |
51 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 ILT |
52 | |
53 | class Target_i386 : public Sized_target<32, false> | |
54 | { | |
55 | public: | |
5a6f7e2d ILT |
56 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
57 | ||
14bfc3f5 | 58 | Target_i386() |
ead1e424 | 59 | : Sized_target<32, false>(&i386_info), |
5a6f7e2d | 60 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
12c0daef | 61 | copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), |
edfbb029 | 62 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 63 | { } |
75f65a3e | 64 | |
6d03d481 ST |
65 | // Process the relocations to determine unreferenced sections for |
66 | // garbage collection. | |
67 | void | |
68 | gc_process_relocs(const General_options& options, | |
69 | Symbol_table* symtab, | |
70 | Layout* layout, | |
71 | Sized_relobj<32, false>* object, | |
72 | unsigned int data_shndx, | |
73 | unsigned int sh_type, | |
74 | const unsigned char* prelocs, | |
75 | size_t reloc_count, | |
76 | Output_section* output_section, | |
77 | bool needs_special_offset_handling, | |
78 | size_t local_symbol_count, | |
79 | const unsigned char* plocal_symbols); | |
80 | ||
92e059d8 | 81 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 82 | void |
92e059d8 ILT |
83 | scan_relocs(const General_options& options, |
84 | 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 | |
7e1edb90 | 98 | do_finalize_sections(Layout*); |
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, | |
fe8718a4 | 115 | section_size_type view_size); |
92e059d8 | 116 | |
6a74a719 ILT |
117 | // Scan the relocs during a relocatable link. |
118 | void | |
119 | scan_relocatable_relocs(const General_options& options, | |
120 | Symbol_table* symtab, | |
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 | ||
96f2030e | 157 | // Return the size of the GOT section. |
fe8718a4 | 158 | section_size_type |
96f2030e ILT |
159 | got_size() |
160 | { | |
161 | gold_assert(this->got_ != NULL); | |
162 | return this->got_->data_size(); | |
163 | } | |
164 | ||
92e059d8 ILT |
165 | private: |
166 | // The class which scans relocations. | |
167 | struct Scan | |
61ba1cf9 ILT |
168 | { |
169 | inline void | |
ead1e424 ILT |
170 | local(const General_options& options, Symbol_table* symtab, |
171 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 172 | Sized_relobj<32, false>* object, |
a3ad94ed | 173 | unsigned int data_shndx, |
07f397ab | 174 | Output_section* output_section, |
92e059d8 ILT |
175 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
176 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 177 | |
92e059d8 | 178 | inline void |
ead1e424 ILT |
179 | global(const General_options& options, Symbol_table* symtab, |
180 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 181 | Sized_relobj<32, false>* object, |
a3ad94ed | 182 | unsigned int data_shndx, |
07f397ab | 183 | Output_section* output_section, |
92e059d8 ILT |
184 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
185 | Symbol* gsym); | |
af6359d5 ILT |
186 | |
187 | static void | |
188 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
189 | ||
190 | static void | |
191 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
192 | Symbol*); | |
61ba1cf9 ILT |
193 | }; |
194 | ||
92e059d8 ILT |
195 | // The class which implements relocation. |
196 | class Relocate | |
197 | { | |
198 | public: | |
ead1e424 | 199 | Relocate() |
46cf9fa2 ILT |
200 | : skip_call_tls_get_addr_(false), |
201 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) | |
ead1e424 ILT |
202 | { } |
203 | ||
204 | ~Relocate() | |
205 | { | |
206 | if (this->skip_call_tls_get_addr_) | |
207 | { | |
208 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 209 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
210 | } |
211 | } | |
212 | ||
86849f1f ILT |
213 | // Return whether the static relocation needs to be applied. |
214 | inline bool | |
215 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 216 | int ref_flags, |
031cdbed ILT |
217 | bool is_32bit, |
218 | Output_section* output_section); | |
86849f1f | 219 | |
ead1e424 ILT |
220 | // Do a relocation. Return false if the caller should not issue |
221 | // any warnings about this relocation. | |
222 | inline bool | |
031cdbed ILT |
223 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
224 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 225 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 226 | const Symbol_value<32>*, |
92e059d8 | 227 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 228 | section_size_type); |
92e059d8 ILT |
229 | |
230 | private: | |
231 | // Do a TLS relocation. | |
ead1e424 | 232 | inline void |
07f397ab ILT |
233 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
234 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 235 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 236 | const Symbol_value<32>*, |
fe8718a4 ILT |
237 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
238 | section_size_type); | |
92e059d8 | 239 | |
07f397ab ILT |
240 | // Do a TLS General-Dynamic to Initial-Exec transition. |
241 | inline void | |
242 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
243 | Output_segment* tls_segment, | |
244 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
245 | elfcpp::Elf_types<32>::Elf_Addr value, | |
246 | unsigned char* view, | |
fe8718a4 | 247 | section_size_type view_size); |
07f397ab | 248 | |
56622147 ILT |
249 | // Do a TLS General-Dynamic to Local-Exec transition. |
250 | inline void | |
251 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
252 | Output_segment* tls_segment, |
253 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
254 | elfcpp::Elf_types<32>::Elf_Addr value, | |
255 | unsigned char* view, | |
fe8718a4 | 256 | section_size_type view_size); |
92e059d8 | 257 | |
c2b45e22 CC |
258 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
259 | // transition. | |
260 | inline void | |
261 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
262 | Output_segment* tls_segment, | |
263 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
264 | elfcpp::Elf_types<32>::Elf_Addr value, | |
265 | unsigned char* view, | |
266 | section_size_type view_size); | |
267 | ||
268 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
269 | // transition. | |
270 | inline void | |
271 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
272 | Output_segment* tls_segment, | |
273 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
274 | elfcpp::Elf_types<32>::Elf_Addr value, | |
275 | unsigned char* view, | |
276 | section_size_type view_size); | |
277 | ||
56622147 | 278 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 279 | inline void |
56622147 | 280 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
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); |
ead1e424 | 286 | |
56622147 ILT |
287 | // Do a TLS Initial-Exec to Local-Exec transition. |
288 | static inline void | |
289 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 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); |
46cf9fa2 | 295 | |
46cf9fa2 ILT |
296 | // We need to keep track of which type of local dynamic relocation |
297 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
298 | enum Local_dynamic_type | |
299 | { | |
300 | LOCAL_DYNAMIC_NONE, | |
301 | LOCAL_DYNAMIC_SUN, | |
302 | LOCAL_DYNAMIC_GNU | |
303 | }; | |
304 | ||
ead1e424 ILT |
305 | // This is set if we should skip the next reloc, which should be a |
306 | // PLT32 reloc against ___tls_get_addr. | |
307 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
308 | // The type of local dynamic relocation we have seen in the section |
309 | // being relocated, if any. | |
310 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
311 | }; |
312 | ||
6a74a719 ILT |
313 | // A class which returns the size required for a relocation type, |
314 | // used while scanning relocs during a relocatable link. | |
315 | class Relocatable_size_for_reloc | |
316 | { | |
317 | public: | |
318 | unsigned int | |
319 | get_size_for_reloc(unsigned int, Relobj*); | |
320 | }; | |
321 | ||
92e059d8 ILT |
322 | // Adjust TLS relocation type based on the options and whether this |
323 | // is a local symbol. | |
af6359d5 | 324 | static tls::Tls_optimization |
7e1edb90 | 325 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 326 | |
ead1e424 | 327 | // Get the GOT section, creating it if necessary. |
dbe717ef | 328 | Output_data_got<32, false>* |
7e1edb90 | 329 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 330 | |
96f2030e ILT |
331 | // Get the GOT PLT section. |
332 | Output_data_space* | |
333 | got_plt_section() const | |
334 | { | |
335 | gold_assert(this->got_plt_ != NULL); | |
336 | return this->got_plt_; | |
337 | } | |
338 | ||
a3ad94ed ILT |
339 | // Create a PLT entry for a global symbol. |
340 | void | |
7e1edb90 | 341 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 342 | |
9fa33bee | 343 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
344 | void |
345 | define_tls_base_symbol(Symbol_table*, Layout*); | |
346 | ||
94c4710f ILT |
347 | // Create a GOT entry for the TLS module index. |
348 | unsigned int | |
349 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
350 | Sized_relobj<32, false>* object); | |
351 | ||
a3ad94ed | 352 | // Get the PLT section. |
7bb3655e | 353 | const Output_data_plt_i386* |
a3ad94ed ILT |
354 | plt_section() const |
355 | { | |
356 | gold_assert(this->plt_ != NULL); | |
357 | return this->plt_; | |
358 | } | |
359 | ||
5a6f7e2d ILT |
360 | // Get the dynamic reloc section, creating it if necessary. |
361 | Reloc_section* | |
362 | rel_dyn_section(Layout*); | |
363 | ||
d61c6bd4 ILT |
364 | // Return true if the symbol may need a COPY relocation. |
365 | // References from an executable object to non-function symbols | |
366 | // defined in a dynamic object may need a COPY relocation. | |
367 | bool | |
368 | may_need_copy_reloc(Symbol* gsym) | |
369 | { | |
8851ecca | 370 | return (!parameters->options().shared() |
d61c6bd4 ILT |
371 | && gsym->is_from_dynobj() |
372 | && gsym->type() != elfcpp::STT_FUNC); | |
373 | } | |
374 | ||
12c0daef | 375 | // Add a potential copy relocation. |
a3ad94ed | 376 | void |
ef9beddf ILT |
377 | copy_reloc(Symbol_table* symtab, Layout* layout, |
378 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
379 | unsigned int shndx, Output_section* output_section, |
380 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
381 | { | |
382 | this->copy_relocs_.copy_reloc(symtab, layout, | |
383 | symtab->get_sized_symbol<32>(sym), | |
384 | object, shndx, output_section, reloc, | |
385 | this->rel_dyn_section(layout)); | |
386 | } | |
ead1e424 | 387 | |
92e059d8 ILT |
388 | // Information about this specific target which we pass to the |
389 | // general Target structure. | |
75f65a3e | 390 | static const Target::Target_info i386_info; |
ead1e424 | 391 | |
0a65a3a7 CC |
392 | // The types of GOT entries needed for this platform. |
393 | enum Got_type | |
394 | { | |
395 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
396 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
397 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
398 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
399 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
400 | }; |
401 | ||
ead1e424 | 402 | // The GOT section. |
dbe717ef | 403 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
404 | // The PLT section. |
405 | Output_data_plt_i386* plt_; | |
406 | // The GOT PLT section. | |
407 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
408 | // The dynamic reloc section. |
409 | Reloc_section* rel_dyn_; | |
410 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 411 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
412 | // Space for variables copied with a COPY reloc. |
413 | Output_data_space* dynbss_; | |
c2b45e22 | 414 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 415 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
416 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
417 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
418 | }; |
419 | ||
420 | const Target::Target_info Target_i386::i386_info = | |
421 | { | |
61ba1cf9 ILT |
422 | 32, // size |
423 | false, // is_big_endian | |
424 | elfcpp::EM_386, // machine_code | |
425 | false, // has_make_symbol | |
dbe717ef | 426 | false, // has_resolve |
c51e6221 | 427 | true, // has_code_fill |
35cdfc9a | 428 | true, // is_default_stack_executable |
0864d551 | 429 | '\0', // wrap_char |
dbe717ef | 430 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 431 | 0x08048000, // default_text_segment_address |
cd72c291 ILT |
432 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
433 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
14bfc3f5 ILT |
434 | }; |
435 | ||
ead1e424 ILT |
436 | // Get the GOT section, creating it if necessary. |
437 | ||
dbe717ef | 438 | Output_data_got<32, false>* |
7e1edb90 | 439 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
440 | { |
441 | if (this->got_ == NULL) | |
442 | { | |
7e1edb90 | 443 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 444 | |
7e1edb90 | 445 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 446 | |
9f1d377b ILT |
447 | Output_section* os; |
448 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
449 | (elfcpp::SHF_ALLOC | |
450 | | elfcpp::SHF_WRITE), | |
451 | this->got_); | |
452 | os->set_is_relro(); | |
ead1e424 | 453 | |
a3ad94ed ILT |
454 | // The old GNU linker creates a .got.plt section. We just |
455 | // create another set of data in the .got section. Note that we | |
456 | // always create a PLT if we create a GOT, although the PLT | |
457 | // might be empty. | |
7d9e3d98 | 458 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
9f1d377b ILT |
459 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
460 | (elfcpp::SHF_ALLOC | |
461 | | elfcpp::SHF_WRITE), | |
462 | this->got_plt_); | |
463 | os->set_is_relro(); | |
a3ad94ed | 464 | |
ead1e424 | 465 | // The first three entries are reserved. |
27bc2bce | 466 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 467 | |
a3ad94ed | 468 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 469 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 470 | this->got_plt_, |
ead1e424 | 471 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 472 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
473 | elfcpp::STV_HIDDEN, 0, |
474 | false, false); | |
475 | } | |
a3ad94ed | 476 | |
ead1e424 ILT |
477 | return this->got_; |
478 | } | |
479 | ||
5a6f7e2d ILT |
480 | // Get the dynamic reloc section, creating it if necessary. |
481 | ||
482 | Target_i386::Reloc_section* | |
483 | Target_i386::rel_dyn_section(Layout* layout) | |
484 | { | |
485 | if (this->rel_dyn_ == NULL) | |
486 | { | |
487 | gold_assert(layout != NULL); | |
d98bc257 | 488 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d ILT |
489 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
490 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
491 | } | |
492 | return this->rel_dyn_; | |
493 | } | |
494 | ||
a3ad94ed ILT |
495 | // A class to handle the PLT data. |
496 | ||
497 | class Output_data_plt_i386 : public Output_section_data | |
498 | { | |
499 | public: | |
500 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
501 | ||
7e1edb90 | 502 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
503 | |
504 | // Add an entry to the PLT. | |
505 | void | |
506 | add_entry(Symbol* gsym); | |
507 | ||
16649710 ILT |
508 | // Return the .rel.plt section data. |
509 | const Reloc_section* | |
510 | rel_plt() const | |
511 | { return this->rel_; } | |
512 | ||
513 | protected: | |
514 | void | |
515 | do_adjust_output_section(Output_section* os); | |
516 | ||
7d9e3d98 ILT |
517 | // Write to a map file. |
518 | void | |
519 | do_print_to_mapfile(Mapfile* mapfile) const | |
520 | { mapfile->print_output_data(this, _("** PLT")); } | |
521 | ||
a3ad94ed ILT |
522 | private: |
523 | // The size of an entry in the PLT. | |
524 | static const int plt_entry_size = 16; | |
525 | ||
526 | // The first entry in the PLT for an executable. | |
527 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
528 | ||
529 | // The first entry in the PLT for a shared object. | |
530 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
531 | ||
532 | // Other entries in the PLT for an executable. | |
533 | static unsigned char exec_plt_entry[plt_entry_size]; | |
534 | ||
535 | // Other entries in the PLT for a shared object. | |
536 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
537 | ||
538 | // Set the final size. | |
539 | void | |
27bc2bce | 540 | set_final_data_size() |
a3ad94ed ILT |
541 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
542 | ||
543 | // Write out the PLT data. | |
544 | void | |
545 | do_write(Output_file*); | |
546 | ||
547 | // The reloc section. | |
548 | Reloc_section* rel_; | |
549 | // The .got.plt section. | |
550 | Output_data_space* got_plt_; | |
551 | // The number of PLT entries. | |
552 | unsigned int count_; | |
a3ad94ed ILT |
553 | }; |
554 | ||
555 | // Create the PLT section. The ordinary .got section is an argument, | |
556 | // since we need to refer to the start. We also create our own .got | |
557 | // section just for PLT entries. | |
558 | ||
559 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 560 | Output_data_space* got_plt) |
80576242 | 561 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed | 562 | { |
d98bc257 | 563 | this->rel_ = new Reloc_section(false); |
a3ad94ed ILT |
564 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
565 | elfcpp::SHF_ALLOC, this->rel_); | |
566 | } | |
567 | ||
16649710 ILT |
568 | void |
569 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
570 | { | |
571 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
572 | // linker, and so do we. | |
573 | os->set_entsize(4); | |
574 | } | |
575 | ||
a3ad94ed ILT |
576 | // Add an entry to the PLT. |
577 | ||
578 | void | |
579 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
580 | { | |
581 | gold_assert(!gsym->has_plt_offset()); | |
582 | ||
583 | // Note that when setting the PLT offset we skip the initial | |
584 | // reserved PLT entry. | |
585 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
586 | ||
587 | ++this->count_; | |
588 | ||
fe8718a4 | 589 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
590 | |
591 | // Every PLT entry needs a GOT entry which points back to the PLT | |
592 | // entry (this will be changed by the dynamic linker, normally | |
593 | // lazily when the function is called). | |
27bc2bce | 594 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
595 | |
596 | // Every PLT entry needs a reloc. | |
16649710 | 597 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
598 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
599 | got_offset); | |
600 | ||
601 | // Note that we don't need to save the symbol. The contents of the | |
602 | // PLT are independent of which symbols are used. The symbols only | |
603 | // appear in the relocations. | |
604 | } | |
605 | ||
606 | // The first entry in the PLT for an executable. | |
607 | ||
608 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
609 | { | |
610 | 0xff, 0x35, // pushl contents of memory address | |
611 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
612 | 0xff, 0x25, // jmp indirect | |
613 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
614 | 0, 0, 0, 0 // unused | |
615 | }; | |
616 | ||
617 | // The first entry in the PLT for a shared object. | |
618 | ||
619 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
620 | { | |
621 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
622 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
623 | 0, 0, 0, 0 // unused | |
624 | }; | |
625 | ||
626 | // Subsequent entries in the PLT for an executable. | |
627 | ||
628 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
629 | { | |
630 | 0xff, 0x25, // jmp indirect | |
631 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
632 | 0x68, // pushl immediate | |
633 | 0, 0, 0, 0, // replaced with offset into relocation table | |
634 | 0xe9, // jmp relative | |
635 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
636 | }; | |
637 | ||
638 | // Subsequent entries in the PLT for a shared object. | |
639 | ||
640 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
641 | { | |
642 | 0xff, 0xa3, // jmp *offset(%ebx) | |
643 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
644 | 0x68, // pushl immediate | |
645 | 0, 0, 0, 0, // replaced with offset into relocation table | |
646 | 0xe9, // jmp relative | |
647 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
648 | }; | |
649 | ||
650 | // Write out the PLT. This uses the hand-coded instructions above, | |
651 | // and adjusts them as needed. This is all specified by the i386 ELF | |
652 | // Processor Supplement. | |
653 | ||
654 | void | |
655 | Output_data_plt_i386::do_write(Output_file* of) | |
656 | { | |
657 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
658 | const section_size_type oview_size = |
659 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
660 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
661 | ||
662 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
663 | const section_size_type got_size = |
664 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
665 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
666 | got_size); | |
667 | ||
668 | unsigned char* pov = oview; | |
669 | ||
670 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
671 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
672 | ||
8851ecca | 673 | if (parameters->options().shared()) |
a3ad94ed ILT |
674 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
675 | else | |
676 | { | |
677 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
678 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
679 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
680 | } | |
681 | pov += plt_entry_size; | |
682 | ||
683 | unsigned char* got_pov = got_view; | |
684 | ||
685 | memset(got_pov, 0, 12); | |
686 | got_pov += 12; | |
687 | ||
688 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
689 | ||
690 | unsigned int plt_offset = plt_entry_size; | |
691 | unsigned int plt_rel_offset = 0; | |
692 | unsigned int got_offset = 12; | |
693 | const unsigned int count = this->count_; | |
694 | for (unsigned int i = 0; | |
695 | i < count; | |
696 | ++i, | |
697 | pov += plt_entry_size, | |
698 | got_pov += 4, | |
699 | plt_offset += plt_entry_size, | |
700 | plt_rel_offset += rel_size, | |
701 | got_offset += 4) | |
702 | { | |
703 | // Set and adjust the PLT entry itself. | |
704 | ||
8851ecca | 705 | if (parameters->options().shared()) |
a3ad94ed ILT |
706 | { |
707 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
708 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
709 | } | |
710 | else | |
711 | { | |
712 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
713 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
714 | (got_address | |
715 | + got_offset)); | |
716 | } | |
717 | ||
718 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
719 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
720 | - (plt_offset + plt_entry_size)); | |
721 | ||
722 | // Set the entry in the GOT. | |
723 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
724 | } | |
725 | ||
fe8718a4 ILT |
726 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
727 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
728 | |
729 | of->write_output_view(offset, oview_size, oview); | |
730 | of->write_output_view(got_file_offset, got_size, got_view); | |
731 | } | |
732 | ||
733 | // Create a PLT entry for a global symbol. | |
734 | ||
735 | void | |
7e1edb90 | 736 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
737 | { |
738 | if (gsym->has_plt_offset()) | |
739 | return; | |
740 | ||
741 | if (this->plt_ == NULL) | |
742 | { | |
743 | // Create the GOT sections first. | |
7e1edb90 | 744 | this->got_section(symtab, layout); |
a3ad94ed | 745 | |
7e1edb90 | 746 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
747 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
748 | (elfcpp::SHF_ALLOC | |
749 | | elfcpp::SHF_EXECINSTR), | |
750 | this->plt_); | |
a3ad94ed ILT |
751 | } |
752 | ||
753 | this->plt_->add_entry(gsym); | |
754 | } | |
755 | ||
9fa33bee | 756 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
757 | |
758 | void | |
759 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
760 | { | |
761 | if (this->tls_base_symbol_defined_) | |
762 | return; | |
763 | ||
764 | Output_segment* tls_segment = layout->tls_segment(); | |
765 | if (tls_segment != NULL) | |
766 | { | |
183fd0e3 | 767 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
768 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
769 | tls_segment, 0, 0, | |
770 | elfcpp::STT_TLS, | |
771 | elfcpp::STB_LOCAL, | |
772 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
773 | (is_exec |
774 | ? Symbol::SEGMENT_END | |
775 | : Symbol::SEGMENT_START), | |
776 | true); | |
edfbb029 CC |
777 | } |
778 | this->tls_base_symbol_defined_ = true; | |
779 | } | |
780 | ||
94c4710f ILT |
781 | // Create a GOT entry for the TLS module index. |
782 | ||
783 | unsigned int | |
784 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
785 | Sized_relobj<32, false>* object) | |
786 | { | |
787 | if (this->got_mod_index_offset_ == -1U) | |
788 | { | |
789 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
790 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
791 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
792 | unsigned int got_offset = got->add_constant(0); | |
793 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
794 | got_offset); | |
009a67a2 | 795 | got->add_constant(0); |
94c4710f ILT |
796 | this->got_mod_index_offset_ = got_offset; |
797 | } | |
798 | return this->got_mod_index_offset_; | |
799 | } | |
800 | ||
92e059d8 | 801 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
802 | // symbol. IS_FINAL is true if the final address of this symbol is |
803 | // known at link time. | |
92e059d8 | 804 | |
af6359d5 | 805 | tls::Tls_optimization |
7e1edb90 | 806 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
807 | { |
808 | // If we are generating a shared library, then we can't do anything | |
809 | // in the linker. | |
8851ecca | 810 | if (parameters->options().shared()) |
af6359d5 | 811 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
812 | |
813 | switch (r_type) | |
814 | { | |
815 | case elfcpp::R_386_TLS_GD: | |
816 | case elfcpp::R_386_TLS_GOTDESC: | |
817 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 818 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
819 | // access. Since we know that we are generating an executable, |
820 | // we can convert this to Initial-Exec. If we also know that | |
821 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 822 | if (is_final) |
af6359d5 ILT |
823 | return tls::TLSOPT_TO_LE; |
824 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
825 | |
826 | case elfcpp::R_386_TLS_LDM: | |
827 | // This is Local-Dynamic, which refers to a local symbol in the | |
828 | // dynamic TLS block. Since we know that we generating an | |
829 | // executable, we can switch to Local-Exec. | |
af6359d5 | 830 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
831 | |
832 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
833 | // Another type of Local-Dynamic relocation. |
834 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
835 | |
836 | case elfcpp::R_386_TLS_IE: | |
837 | case elfcpp::R_386_TLS_GOTIE: | |
838 | case elfcpp::R_386_TLS_IE_32: | |
839 | // These are Initial-Exec relocs which get the thread offset | |
840 | // from the GOT. If we know that we are linking against the | |
841 | // local symbol, we can switch to Local-Exec, which links the | |
842 | // thread offset into the instruction. | |
a3ad94ed | 843 | if (is_final) |
af6359d5 ILT |
844 | return tls::TLSOPT_TO_LE; |
845 | return tls::TLSOPT_NONE; | |
8462ae85 | 846 | |
92e059d8 ILT |
847 | case elfcpp::R_386_TLS_LE: |
848 | case elfcpp::R_386_TLS_LE_32: | |
849 | // When we already have Local-Exec, there is nothing further we | |
850 | // can do. | |
af6359d5 | 851 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
852 | |
853 | default: | |
a3ad94ed | 854 | gold_unreachable(); |
92e059d8 ILT |
855 | } |
856 | } | |
857 | ||
af6359d5 ILT |
858 | // Report an unsupported relocation against a local symbol. |
859 | ||
860 | void | |
861 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
862 | unsigned int r_type) | |
863 | { | |
75f2446e ILT |
864 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
865 | object->name().c_str(), r_type); | |
af6359d5 ILT |
866 | } |
867 | ||
92e059d8 ILT |
868 | // Scan a relocation for a local symbol. |
869 | ||
870 | inline void | |
7e1edb90 | 871 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
872 | Symbol_table* symtab, |
873 | Layout* layout, | |
874 | Target_i386* target, | |
f6ce93d6 | 875 | Sized_relobj<32, false>* object, |
1b64748b | 876 | unsigned int data_shndx, |
07f397ab | 877 | Output_section* output_section, |
1b64748b | 878 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 879 | unsigned int r_type, |
7bf1f802 | 880 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
881 | { |
882 | switch (r_type) | |
883 | { | |
884 | case elfcpp::R_386_NONE: | |
885 | case elfcpp::R_386_GNU_VTINHERIT: | |
886 | case elfcpp::R_386_GNU_VTENTRY: | |
887 | break; | |
888 | ||
889 | case elfcpp::R_386_32: | |
436ca963 ILT |
890 | // If building a shared library (or a position-independent |
891 | // executable), we need to create a dynamic relocation for | |
892 | // this location. The relocation applied at link time will | |
893 | // apply the link-time value, so we flag the location with | |
894 | // an R_386_RELATIVE relocation so the dynamic loader can | |
895 | // relocate it easily. | |
8851ecca | 896 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
897 | { |
898 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
899 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
900 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
901 | output_section, data_shndx, | |
902 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
903 | } |
904 | break; | |
905 | ||
906 | case elfcpp::R_386_16: | |
907 | case elfcpp::R_386_8: | |
908 | // If building a shared library (or a position-independent | |
909 | // executable), we need to create a dynamic relocation for | |
910 | // this location. Because the addend needs to remain in the | |
911 | // data section, we need to be careful not to apply this | |
912 | // relocation statically. | |
8851ecca | 913 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
914 | { |
915 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 916 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 917 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
918 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
919 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
920 | else |
921 | { | |
922 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
923 | unsigned int shndx = lsym.get_st_shndx(); |
924 | bool is_ordinary; | |
925 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
926 | &is_ordinary); | |
927 | if (!is_ordinary) | |
928 | object->error(_("section symbol %u has bad shndx %u"), | |
929 | r_sym, shndx); | |
930 | else | |
931 | rel_dyn->add_local_section(object, shndx, | |
932 | r_type, output_section, | |
933 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 934 | } |
436ca963 | 935 | } |
92e059d8 ILT |
936 | break; |
937 | ||
938 | case elfcpp::R_386_PC32: | |
939 | case elfcpp::R_386_PC16: | |
940 | case elfcpp::R_386_PC8: | |
941 | break; | |
942 | ||
df2efe71 ILT |
943 | case elfcpp::R_386_PLT32: |
944 | // Since we know this is a local symbol, we can handle this as a | |
945 | // PC32 reloc. | |
946 | break; | |
947 | ||
ead1e424 ILT |
948 | case elfcpp::R_386_GOTOFF: |
949 | case elfcpp::R_386_GOTPC: | |
950 | // We need a GOT section. | |
7e1edb90 | 951 | target->got_section(symtab, layout); |
ead1e424 ILT |
952 | break; |
953 | ||
1b64748b ILT |
954 | case elfcpp::R_386_GOT32: |
955 | { | |
956 | // The symbol requires a GOT entry. | |
957 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
958 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 959 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
960 | { |
961 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 962 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 963 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
964 | { |
965 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 966 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
967 | rel_dyn->add_local_relative( |
968 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
969 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
970 | } |
971 | } | |
972 | } | |
973 | break; | |
974 | ||
af6359d5 ILT |
975 | // These are relocations which should only be seen by the |
976 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
977 | case elfcpp::R_386_COPY: |
978 | case elfcpp::R_386_GLOB_DAT: | |
979 | case elfcpp::R_386_JUMP_SLOT: | |
980 | case elfcpp::R_386_RELATIVE: | |
981 | case elfcpp::R_386_TLS_TPOFF: | |
982 | case elfcpp::R_386_TLS_DTPMOD32: | |
983 | case elfcpp::R_386_TLS_DTPOFF32: | |
984 | case elfcpp::R_386_TLS_TPOFF32: | |
985 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 986 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 987 | object->name().c_str(), r_type); |
92e059d8 ILT |
988 | break; |
989 | ||
af6359d5 | 990 | // These are initial TLS relocs, which are expected when |
d61c17ea | 991 | // linking. |
56622147 ILT |
992 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
993 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
994 | case elfcpp::R_386_TLS_DESC_CALL: | |
995 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
996 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
997 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 998 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
999 | case elfcpp::R_386_TLS_GOTIE: |
1000 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1001 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1002 | { |
8851ecca | 1003 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1004 | const tls::Tls_optimization optimized_type |
1005 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1006 | switch (r_type) |
1007 | { | |
56622147 | 1008 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1009 | if (optimized_type == tls::TLSOPT_NONE) |
1010 | { | |
1011 | // Create a pair of GOT entries for the module index and | |
1012 | // dtv-relative offset. | |
1013 | Output_data_got<32, false>* got | |
1014 | = target->got_section(symtab, layout); | |
1015 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1016 | unsigned int shndx = lsym.get_st_shndx(); |
1017 | bool is_ordinary; | |
1018 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1019 | if (!is_ordinary) | |
1020 | object->error(_("local symbol %u has bad shndx %u"), | |
1021 | r_sym, shndx); | |
1022 | else | |
1023 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1024 | GOT_TYPE_TLS_PAIR, | |
1025 | target->rel_dyn_section(layout), | |
1026 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1027 | } |
1028 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1029 | unsupported_reloc_local(object, r_type); | |
1030 | break; | |
1031 | ||
56622147 | 1032 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1033 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1034 | if (optimized_type == tls::TLSOPT_NONE) |
1035 | { | |
1036 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1037 | Output_data_got<32, false>* got | |
1038 | = target->got_section(symtab, layout); | |
1039 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1040 | unsigned int shndx = lsym.get_st_shndx(); |
1041 | bool is_ordinary; | |
1042 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1043 | if (!is_ordinary) | |
1044 | object->error(_("local symbol %u has bad shndx %u"), | |
1045 | r_sym, shndx); | |
1046 | else | |
1047 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1048 | GOT_TYPE_TLS_DESC, | |
1049 | target->rel_dyn_section(layout), | |
1050 | elfcpp::R_386_TLS_DESC, 0); | |
c2b45e22 CC |
1051 | } |
1052 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1053 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1054 | break; |
1055 | ||
c2b45e22 CC |
1056 | case elfcpp::R_386_TLS_DESC_CALL: |
1057 | break; | |
1058 | ||
56622147 | 1059 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1060 | if (optimized_type == tls::TLSOPT_NONE) |
1061 | { | |
1062 | // Create a GOT entry for the module index. | |
94c4710f | 1063 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1064 | } |
1065 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1066 | unsupported_reloc_local(object, r_type); |
1067 | break; | |
1068 | ||
56622147 | 1069 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1070 | break; |
1071 | ||
56622147 ILT |
1072 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1073 | case elfcpp::R_386_TLS_IE_32: | |
1074 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1075 | layout->set_has_static_tls(); |
07f397ab ILT |
1076 | if (optimized_type == tls::TLSOPT_NONE) |
1077 | { | |
7bf1f802 ILT |
1078 | // For the R_386_TLS_IE relocation, we need to create a |
1079 | // dynamic relocation when building a shared library. | |
1080 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1081 | && parameters->options().shared()) |
7bf1f802 ILT |
1082 | { |
1083 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1084 | unsigned int r_sym |
1085 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1086 | rel_dyn->add_local_relative(object, r_sym, | |
1087 | elfcpp::R_386_RELATIVE, | |
1088 | output_section, data_shndx, | |
1089 | reloc.get_r_offset()); | |
7bf1f802 | 1090 | } |
07f397ab ILT |
1091 | // Create a GOT entry for the tp-relative offset. |
1092 | Output_data_got<32, false>* got | |
1093 | = target->got_section(symtab, layout); | |
1094 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1095 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1096 | ? elfcpp::R_386_TLS_TPOFF32 | |
1097 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1098 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1099 | ? GOT_TYPE_TLS_OFFSET | |
1100 | : GOT_TYPE_TLS_NOFFSET); | |
1101 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1102 | target->rel_dyn_section(layout), |
1103 | dyn_r_type); | |
07f397ab ILT |
1104 | } |
1105 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1106 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1107 | break; |
af6359d5 | 1108 | |
56622147 ILT |
1109 | case elfcpp::R_386_TLS_LE: // Local-exec |
1110 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1111 | layout->set_has_static_tls(); |
07f397ab | 1112 | if (output_is_shared) |
7bf1f802 ILT |
1113 | { |
1114 | // We need to create a dynamic relocation. | |
dceae3c1 | 1115 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1116 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1117 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1118 | ? elfcpp::R_386_TLS_TPOFF32 | |
1119 | : elfcpp::R_386_TLS_TPOFF); | |
1120 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1121 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1122 | data_shndx, reloc.get_r_offset()); | |
1123 | } | |
56622147 ILT |
1124 | break; |
1125 | ||
af6359d5 ILT |
1126 | default: |
1127 | gold_unreachable(); | |
7e1edb90 ILT |
1128 | } |
1129 | } | |
92e059d8 ILT |
1130 | break; |
1131 | ||
92e059d8 ILT |
1132 | case elfcpp::R_386_32PLT: |
1133 | case elfcpp::R_386_TLS_GD_32: | |
1134 | case elfcpp::R_386_TLS_GD_PUSH: | |
1135 | case elfcpp::R_386_TLS_GD_CALL: | |
1136 | case elfcpp::R_386_TLS_GD_POP: | |
1137 | case elfcpp::R_386_TLS_LDM_32: | |
1138 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1139 | case elfcpp::R_386_TLS_LDM_CALL: | |
1140 | case elfcpp::R_386_TLS_LDM_POP: | |
1141 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1142 | default: | |
af6359d5 | 1143 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1144 | break; |
1145 | } | |
1146 | } | |
1147 | ||
af6359d5 ILT |
1148 | // Report an unsupported relocation against a global symbol. |
1149 | ||
1150 | void | |
1151 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1152 | unsigned int r_type, | |
1153 | Symbol* gsym) | |
1154 | { | |
75f2446e | 1155 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1156 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1157 | } |
1158 | ||
92e059d8 ILT |
1159 | // Scan a relocation for a global symbol. |
1160 | ||
1161 | inline void | |
12c0daef | 1162 | Target_i386::Scan::global(const General_options&, |
ead1e424 ILT |
1163 | Symbol_table* symtab, |
1164 | Layout* layout, | |
1165 | Target_i386* target, | |
f6ce93d6 | 1166 | Sized_relobj<32, false>* object, |
a3ad94ed | 1167 | unsigned int data_shndx, |
07f397ab | 1168 | Output_section* output_section, |
a3ad94ed ILT |
1169 | const elfcpp::Rel<32, false>& reloc, |
1170 | unsigned int r_type, | |
92e059d8 ILT |
1171 | Symbol* gsym) |
1172 | { | |
1173 | switch (r_type) | |
1174 | { | |
1175 | case elfcpp::R_386_NONE: | |
1176 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1177 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1178 | break; |
1179 | ||
1180 | case elfcpp::R_386_32: | |
92e059d8 | 1181 | case elfcpp::R_386_16: |
92e059d8 | 1182 | case elfcpp::R_386_8: |
96f2030e | 1183 | { |
d61c6bd4 ILT |
1184 | // Make a PLT entry if necessary. |
1185 | if (gsym->needs_plt_entry()) | |
1186 | { | |
1187 | target->make_plt_entry(symtab, layout, gsym); | |
1188 | // Since this is not a PC-relative relocation, we may be | |
1189 | // taking the address of a function. In that case we need to | |
1190 | // set the entry in the dynamic symbol table to the address of | |
1191 | // the PLT entry. | |
8851ecca | 1192 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1193 | gsym->set_needs_dynsym_value(); |
1194 | } | |
1195 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1196 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1197 | { |
1198 | if (target->may_need_copy_reloc(gsym)) | |
1199 | { | |
12c0daef | 1200 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1201 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1202 | } |
1203 | else if (r_type == elfcpp::R_386_32 | |
1204 | && gsym->can_use_relative_reloc(false)) | |
1205 | { | |
1206 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1207 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1208 | output_section, object, | |
1209 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1210 | } |
1211 | else | |
1212 | { | |
96f2030e | 1213 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1214 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1215 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1216 | } |
1217 | } | |
1218 | } | |
1219 | break; | |
1220 | ||
1221 | case elfcpp::R_386_PC32: | |
1222 | case elfcpp::R_386_PC16: | |
1223 | case elfcpp::R_386_PC8: | |
1224 | { | |
1225 | // Make a PLT entry if necessary. | |
1226 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1227 | { |
1228 | // These relocations are used for function calls only in | |
1229 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1230 | // we'll need a text relocation anyway, so we can skip the | |
1231 | // PLT entry and let the dynamic linker bind the call directly | |
1232 | // to the target. For smaller relocations, we should use a | |
1233 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1234 | if (!parameters->options().shared() |
7bf1f802 ILT |
1235 | || r_type != elfcpp::R_386_PC32) |
1236 | target->make_plt_entry(symtab, layout, gsym); | |
1237 | } | |
d61c6bd4 | 1238 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1239 | int flags = Symbol::NON_PIC_REF; |
1240 | if (gsym->type() == elfcpp::STT_FUNC) | |
1241 | flags |= Symbol::FUNCTION_CALL; | |
1242 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1243 | { |
d61c6bd4 ILT |
1244 | if (target->may_need_copy_reloc(gsym)) |
1245 | { | |
12c0daef | 1246 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1247 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1248 | } |
86849f1f | 1249 | else |
d61c6bd4 ILT |
1250 | { |
1251 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1252 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1253 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1254 | } |
96f2030e ILT |
1255 | } |
1256 | } | |
92e059d8 ILT |
1257 | break; |
1258 | ||
ead1e424 | 1259 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1260 | { |
1261 | // The symbol requires a GOT entry. | |
7e1edb90 | 1262 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1263 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1264 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1265 | else |
1266 | { | |
8462ae85 | 1267 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1268 | // GOT entry with a dynamic relocation. |
1269 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1270 | if (gsym->is_from_dynobj() |
1271 | || gsym->is_undefined() | |
1272 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1273 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1274 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1275 | else |
8462ae85 | 1276 | { |
0a65a3a7 CC |
1277 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1278 | rel_dyn->add_global_relative( | |
1279 | gsym, elfcpp::R_386_RELATIVE, got, | |
1280 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1281 | } |
1282 | } | |
1283 | } | |
ead1e424 ILT |
1284 | break; |
1285 | ||
1286 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1287 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1288 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1289 | if (gsym->final_value_is_known()) |
ead1e424 | 1290 | break; |
436ca963 ILT |
1291 | // If building a shared library, we can also skip the PLT entry |
1292 | // if the symbol is defined in the output file and is protected | |
1293 | // or hidden. | |
1294 | if (gsym->is_defined() | |
1295 | && !gsym->is_from_dynobj() | |
1296 | && !gsym->is_preemptible()) | |
1297 | break; | |
7e1edb90 | 1298 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1299 | break; |
1300 | ||
1301 | case elfcpp::R_386_GOTOFF: | |
1302 | case elfcpp::R_386_GOTPC: | |
1303 | // We need a GOT section. | |
7e1edb90 | 1304 | target->got_section(symtab, layout); |
ead1e424 ILT |
1305 | break; |
1306 | ||
af6359d5 ILT |
1307 | // These are relocations which should only be seen by the |
1308 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1309 | case elfcpp::R_386_COPY: |
1310 | case elfcpp::R_386_GLOB_DAT: | |
1311 | case elfcpp::R_386_JUMP_SLOT: | |
1312 | case elfcpp::R_386_RELATIVE: | |
1313 | case elfcpp::R_386_TLS_TPOFF: | |
1314 | case elfcpp::R_386_TLS_DTPMOD32: | |
1315 | case elfcpp::R_386_TLS_DTPOFF32: | |
1316 | case elfcpp::R_386_TLS_TPOFF32: | |
1317 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1318 | gold_error(_("%s: unexpected reloc %u in object file"), |
1319 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1320 | break; |
1321 | ||
d61c17ea ILT |
1322 | // These are initial tls relocs, which are expected when |
1323 | // linking. | |
56622147 ILT |
1324 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1325 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1326 | case elfcpp::R_386_TLS_DESC_CALL: | |
1327 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1328 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1329 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1330 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1331 | case elfcpp::R_386_TLS_GOTIE: |
1332 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1333 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1334 | { |
7e1edb90 | 1335 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1336 | const tls::Tls_optimization optimized_type |
1337 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1338 | switch (r_type) |
1339 | { | |
56622147 | 1340 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1341 | if (optimized_type == tls::TLSOPT_NONE) |
1342 | { | |
1343 | // Create a pair of GOT entries for the module index and | |
1344 | // dtv-relative offset. | |
1345 | Output_data_got<32, false>* got | |
1346 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1347 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1348 | target->rel_dyn_section(layout), |
1349 | elfcpp::R_386_TLS_DTPMOD32, | |
1350 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1351 | } |
1352 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1353 | { | |
1354 | // Create a GOT entry for the tp-relative offset. | |
1355 | Output_data_got<32, false>* got | |
1356 | = target->got_section(symtab, layout); | |
c2b45e22 | 1357 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1358 | target->rel_dyn_section(layout), |
c2b45e22 | 1359 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1360 | } |
1361 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1362 | unsupported_reloc_global(object, r_type, gsym); | |
1363 | break; | |
1364 | ||
56622147 | 1365 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1366 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1367 | if (optimized_type == tls::TLSOPT_NONE) |
1368 | { | |
1369 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1370 | Output_data_got<32, false>* got | |
1371 | = target->got_section(symtab, layout); | |
1372 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1373 | target->rel_dyn_section(layout), | |
1374 | elfcpp::R_386_TLS_DESC, 0); | |
1375 | } | |
1376 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1377 | { | |
1378 | // Create a GOT entry for the tp-relative offset. | |
1379 | Output_data_got<32, false>* got | |
1380 | = target->got_section(symtab, layout); | |
1381 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1382 | target->rel_dyn_section(layout), | |
1383 | elfcpp::R_386_TLS_TPOFF); | |
1384 | } | |
1385 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1386 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1387 | break; |
1388 | ||
1389 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1390 | break; |
1391 | ||
56622147 | 1392 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1393 | if (optimized_type == tls::TLSOPT_NONE) |
1394 | { | |
1395 | // Create a GOT entry for the module index. | |
94c4710f | 1396 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1397 | } |
1398 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1399 | unsupported_reloc_global(object, r_type, gsym); |
1400 | break; | |
1401 | ||
56622147 | 1402 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1403 | break; |
1404 | ||
56622147 ILT |
1405 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1406 | case elfcpp::R_386_TLS_IE_32: | |
1407 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1408 | layout->set_has_static_tls(); |
07f397ab ILT |
1409 | if (optimized_type == tls::TLSOPT_NONE) |
1410 | { | |
7bf1f802 ILT |
1411 | // For the R_386_TLS_IE relocation, we need to create a |
1412 | // dynamic relocation when building a shared library. | |
1413 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1414 | && parameters->options().shared()) |
07f397ab | 1415 | { |
07f397ab | 1416 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1417 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1418 | output_section, object, | |
1419 | data_shndx, | |
1420 | reloc.get_r_offset()); | |
07f397ab | 1421 | } |
7bf1f802 ILT |
1422 | // Create a GOT entry for the tp-relative offset. |
1423 | Output_data_got<32, false>* got | |
1424 | = target->got_section(symtab, layout); | |
1425 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1426 | ? elfcpp::R_386_TLS_TPOFF32 | |
1427 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1428 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1429 | ? GOT_TYPE_TLS_OFFSET | |
1430 | : GOT_TYPE_TLS_NOFFSET); | |
1431 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1432 | target->rel_dyn_section(layout), |
1433 | dyn_r_type); | |
07f397ab ILT |
1434 | } |
1435 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1436 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1437 | break; |
af6359d5 | 1438 | |
56622147 ILT |
1439 | case elfcpp::R_386_TLS_LE: // Local-exec |
1440 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1441 | layout->set_has_static_tls(); |
8851ecca | 1442 | if (parameters->options().shared()) |
7bf1f802 ILT |
1443 | { |
1444 | // We need to create a dynamic relocation. | |
1445 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1446 | ? elfcpp::R_386_TLS_TPOFF32 | |
1447 | : elfcpp::R_386_TLS_TPOFF); | |
1448 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1449 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1450 | data_shndx, reloc.get_r_offset()); | |
1451 | } | |
56622147 ILT |
1452 | break; |
1453 | ||
af6359d5 ILT |
1454 | default: |
1455 | gold_unreachable(); | |
a3ad94ed ILT |
1456 | } |
1457 | } | |
92e059d8 ILT |
1458 | break; |
1459 | ||
92e059d8 ILT |
1460 | case elfcpp::R_386_32PLT: |
1461 | case elfcpp::R_386_TLS_GD_32: | |
1462 | case elfcpp::R_386_TLS_GD_PUSH: | |
1463 | case elfcpp::R_386_TLS_GD_CALL: | |
1464 | case elfcpp::R_386_TLS_GD_POP: | |
1465 | case elfcpp::R_386_TLS_LDM_32: | |
1466 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1467 | case elfcpp::R_386_TLS_LDM_CALL: | |
1468 | case elfcpp::R_386_TLS_LDM_POP: | |
1469 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1470 | default: | |
af6359d5 | 1471 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1472 | break; |
1473 | } | |
1474 | } | |
1475 | ||
6d03d481 ST |
1476 | // Process relocations for gc. |
1477 | ||
1478 | void | |
1479 | Target_i386::gc_process_relocs(const General_options& options, | |
1480 | Symbol_table* symtab, | |
1481 | Layout* layout, | |
1482 | Sized_relobj<32, false>* object, | |
1483 | unsigned int data_shndx, | |
1484 | unsigned int, | |
1485 | const unsigned char* prelocs, | |
1486 | size_t reloc_count, | |
1487 | Output_section* output_section, | |
1488 | bool needs_special_offset_handling, | |
1489 | size_t local_symbol_count, | |
1490 | const unsigned char* plocal_symbols) | |
1491 | { | |
1492 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
1493 | Target_i386::Scan>( | |
1494 | options, | |
1495 | symtab, | |
1496 | layout, | |
1497 | this, | |
1498 | object, | |
1499 | data_shndx, | |
1500 | prelocs, | |
1501 | reloc_count, | |
1502 | output_section, | |
1503 | needs_special_offset_handling, | |
1504 | local_symbol_count, | |
1505 | plocal_symbols); | |
1506 | } | |
1507 | ||
92e059d8 ILT |
1508 | // Scan relocations for a section. |
1509 | ||
1510 | void | |
1511 | Target_i386::scan_relocs(const General_options& options, | |
1512 | Symbol_table* symtab, | |
ead1e424 | 1513 | Layout* layout, |
f6ce93d6 | 1514 | Sized_relobj<32, false>* object, |
a3ad94ed | 1515 | unsigned int data_shndx, |
92e059d8 ILT |
1516 | unsigned int sh_type, |
1517 | const unsigned char* prelocs, | |
1518 | size_t reloc_count, | |
730cdc88 ILT |
1519 | Output_section* output_section, |
1520 | bool needs_special_offset_handling, | |
92e059d8 | 1521 | size_t local_symbol_count, |
730cdc88 | 1522 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1523 | { |
1524 | if (sh_type == elfcpp::SHT_RELA) | |
1525 | { | |
75f2446e ILT |
1526 | gold_error(_("%s: unsupported RELA reloc section"), |
1527 | object->name().c_str()); | |
1528 | return; | |
92e059d8 ILT |
1529 | } |
1530 | ||
ead1e424 ILT |
1531 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1532 | Target_i386::Scan>( | |
92e059d8 ILT |
1533 | options, |
1534 | symtab, | |
ead1e424 ILT |
1535 | layout, |
1536 | this, | |
92e059d8 | 1537 | object, |
a3ad94ed | 1538 | data_shndx, |
92e059d8 ILT |
1539 | prelocs, |
1540 | reloc_count, | |
730cdc88 ILT |
1541 | output_section, |
1542 | needs_special_offset_handling, | |
92e059d8 | 1543 | local_symbol_count, |
730cdc88 | 1544 | plocal_symbols); |
92e059d8 ILT |
1545 | } |
1546 | ||
16649710 | 1547 | // Finalize the sections. |
5a6f7e2d ILT |
1548 | |
1549 | void | |
7e1edb90 | 1550 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1551 | { |
16649710 ILT |
1552 | // Fill in some more dynamic tags. |
1553 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1554 | if (odyn != NULL) | |
1555 | { | |
1556 | if (this->got_plt_ != NULL) | |
1557 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1558 | ||
1559 | if (this->plt_ != NULL) | |
1560 | { | |
1561 | const Output_data* od = this->plt_->rel_plt(); | |
1562 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1563 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1564 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1565 | } | |
1566 | ||
1567 | if (this->rel_dyn_ != NULL) | |
1568 | { | |
1569 | const Output_data* od = this->rel_dyn_; | |
1570 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1571 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1572 | odyn->add_constant(elfcpp::DT_RELENT, | |
1573 | elfcpp::Elf_sizes<32>::rel_size); | |
1574 | } | |
1575 | ||
8851ecca | 1576 | if (!parameters->options().shared()) |
16649710 ILT |
1577 | { |
1578 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1579 | // linker at run time, and used by the debugger. | |
1580 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1581 | } | |
1582 | } | |
1583 | ||
1584 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1585 | // relocs. | |
12c0daef ILT |
1586 | if (this->copy_relocs_.any_saved_relocs()) |
1587 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1588 | } |
1589 | ||
86849f1f ILT |
1590 | // Return whether a direct absolute static relocation needs to be applied. |
1591 | // In cases where Scan::local() or Scan::global() has created | |
1592 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1593 | // of the relocation is carried in the data, and we must not | |
1594 | // apply the static relocation. | |
1595 | ||
1596 | inline bool | |
1597 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1598 | int ref_flags, |
031cdbed ILT |
1599 | bool is_32bit, |
1600 | Output_section* output_section) | |
86849f1f | 1601 | { |
031cdbed ILT |
1602 | // If the output section is not allocated, then we didn't call |
1603 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1604 | // the reloc here. | |
1605 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1606 | return true; | |
1607 | ||
d61c6bd4 ILT |
1608 | // For local symbols, we will have created a non-RELATIVE dynamic |
1609 | // relocation only if (a) the output is position independent, | |
1610 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1611 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1612 | if (gsym == NULL) |
8851ecca | 1613 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1614 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1615 | && !is_32bit); |
86849f1f | 1616 | |
0700cf32 ILT |
1617 | // For global symbols, we use the same helper routines used in the |
1618 | // scan pass. If we did not create a dynamic relocation, or if we | |
1619 | // created a RELATIVE dynamic relocation, we should apply the static | |
1620 | // relocation. | |
1621 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1622 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1623 | && gsym->can_use_relative_reloc(ref_flags | |
1624 | & Symbol::FUNCTION_CALL); | |
1625 | return !has_dyn || is_rel; | |
86849f1f ILT |
1626 | } |
1627 | ||
61ba1cf9 ILT |
1628 | // Perform a relocation. |
1629 | ||
ead1e424 | 1630 | inline bool |
92e059d8 | 1631 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1632 | Target_i386* target, |
031cdbed | 1633 | Output_section *output_section, |
92e059d8 ILT |
1634 | size_t relnum, |
1635 | const elfcpp::Rel<32, false>& rel, | |
1636 | unsigned int r_type, | |
c06b7b0b | 1637 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1638 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1639 | unsigned char* view, |
1640 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1641 | section_size_type view_size) |
61ba1cf9 | 1642 | { |
ead1e424 ILT |
1643 | if (this->skip_call_tls_get_addr_) |
1644 | { | |
5efc7cd2 CC |
1645 | if ((r_type != elfcpp::R_386_PLT32 |
1646 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1647 | || gsym == NULL |
1648 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1649 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1650 | _("missing expected TLS relocation")); | |
1651 | else | |
ead1e424 | 1652 | { |
75f2446e ILT |
1653 | this->skip_call_tls_get_addr_ = false; |
1654 | return false; | |
ead1e424 | 1655 | } |
ead1e424 ILT |
1656 | } |
1657 | ||
a3ad94ed | 1658 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1659 | Symbol_value<32> symval; |
436ca963 | 1660 | if (gsym != NULL |
de4c45bd ILT |
1661 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1662 | || r_type == elfcpp::R_386_PC16 | |
1663 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1664 | { |
b8e6aad9 ILT |
1665 | symval.set_output_value(target->plt_section()->address() |
1666 | + gsym->plt_offset()); | |
1667 | psymval = &symval; | |
a3ad94ed ILT |
1668 | } |
1669 | ||
b8e6aad9 ILT |
1670 | const Sized_relobj<32, false>* object = relinfo->object; |
1671 | ||
1b64748b | 1672 | // Get the GOT offset if needed. |
96f2030e ILT |
1673 | // The GOT pointer points to the end of the GOT section. |
1674 | // We need to subtract the size of the GOT section to get | |
1675 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1676 | bool have_got_offset = false; |
1677 | unsigned int got_offset = 0; | |
1678 | switch (r_type) | |
1679 | { | |
1680 | case elfcpp::R_386_GOT32: | |
1681 | if (gsym != NULL) | |
1682 | { | |
0a65a3a7 CC |
1683 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1684 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1685 | - target->got_size()); | |
1b64748b ILT |
1686 | } |
1687 | else | |
1688 | { | |
1689 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1690 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1691 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1692 | - target->got_size()); | |
1b64748b ILT |
1693 | } |
1694 | have_got_offset = true; | |
1695 | break; | |
1696 | ||
1697 | default: | |
1698 | break; | |
1699 | } | |
1700 | ||
61ba1cf9 ILT |
1701 | switch (r_type) |
1702 | { | |
1703 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1704 | case elfcpp::R_386_GNU_VTINHERIT: |
1705 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1706 | break; |
1707 | ||
1708 | case elfcpp::R_386_32: | |
031cdbed ILT |
1709 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1710 | output_section)) | |
86849f1f | 1711 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1712 | break; |
1713 | ||
1714 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1715 | { |
0700cf32 ILT |
1716 | int ref_flags = Symbol::NON_PIC_REF; |
1717 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1718 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed | 1719 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1720 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1721 | } | |
92e059d8 ILT |
1722 | break; |
1723 | ||
1724 | case elfcpp::R_386_16: | |
031cdbed ILT |
1725 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1726 | output_section)) | |
86849f1f | 1727 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1728 | break; |
1729 | ||
1730 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1731 | { |
0700cf32 ILT |
1732 | int ref_flags = Symbol::NON_PIC_REF; |
1733 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1734 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed | 1735 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1736 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1737 | } |
61ba1cf9 ILT |
1738 | break; |
1739 | ||
92e059d8 | 1740 | case elfcpp::R_386_8: |
031cdbed ILT |
1741 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1742 | output_section)) | |
86849f1f | 1743 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1744 | break; |
1745 | ||
1746 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1747 | { |
0700cf32 ILT |
1748 | int ref_flags = Symbol::NON_PIC_REF; |
1749 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1750 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed ILT |
1751 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1752 | output_section)) | |
d09e9154 | 1753 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1754 | } |
92e059d8 ILT |
1755 | break; |
1756 | ||
ead1e424 | 1757 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1758 | gold_assert(gsym == NULL |
1759 | || gsym->has_plt_offset() | |
99f8faca ILT |
1760 | || gsym->final_value_is_known() |
1761 | || (gsym->is_defined() | |
1762 | && !gsym->is_from_dynobj() | |
1763 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1764 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1765 | break; |
1766 | ||
1767 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1768 | gold_assert(have_got_offset); |
1769 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1770 | break; |
1771 | ||
1772 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1773 | { |
1774 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1775 | value = (psymval->value(object, 0) | |
96f2030e | 1776 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1777 | Relocate_functions<32, false>::rel32(view, value); |
1778 | } | |
ead1e424 ILT |
1779 | break; |
1780 | ||
1781 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1782 | { |
1783 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1784 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1785 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1786 | } | |
ead1e424 ILT |
1787 | break; |
1788 | ||
92e059d8 ILT |
1789 | case elfcpp::R_386_COPY: |
1790 | case elfcpp::R_386_GLOB_DAT: | |
1791 | case elfcpp::R_386_JUMP_SLOT: | |
1792 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1793 | // These are outstanding tls relocs, which are unexpected when |
1794 | // linking. | |
92e059d8 ILT |
1795 | case elfcpp::R_386_TLS_TPOFF: |
1796 | case elfcpp::R_386_TLS_DTPMOD32: | |
1797 | case elfcpp::R_386_TLS_DTPOFF32: | |
1798 | case elfcpp::R_386_TLS_TPOFF32: | |
1799 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1800 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1801 | _("unexpected reloc %u in object file"), | |
1802 | r_type); | |
92e059d8 ILT |
1803 | break; |
1804 | ||
d61c17ea ILT |
1805 | // These are initial tls relocs, which are expected when |
1806 | // linking. | |
56622147 ILT |
1807 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1808 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1809 | case elfcpp::R_386_TLS_DESC_CALL: | |
1810 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1811 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1812 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1813 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1814 | case elfcpp::R_386_TLS_GOTIE: |
1815 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1816 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1817 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1818 | view, address, view_size); | |
92e059d8 ILT |
1819 | break; |
1820 | ||
92e059d8 ILT |
1821 | case elfcpp::R_386_32PLT: |
1822 | case elfcpp::R_386_TLS_GD_32: | |
1823 | case elfcpp::R_386_TLS_GD_PUSH: | |
1824 | case elfcpp::R_386_TLS_GD_CALL: | |
1825 | case elfcpp::R_386_TLS_GD_POP: | |
1826 | case elfcpp::R_386_TLS_LDM_32: | |
1827 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1828 | case elfcpp::R_386_TLS_LDM_CALL: | |
1829 | case elfcpp::R_386_TLS_LDM_POP: | |
1830 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1831 | default: |
75f2446e ILT |
1832 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1833 | _("unsupported reloc %u"), | |
1834 | r_type); | |
92e059d8 ILT |
1835 | break; |
1836 | } | |
ead1e424 ILT |
1837 | |
1838 | return true; | |
92e059d8 ILT |
1839 | } |
1840 | ||
1841 | // Perform a TLS relocation. | |
1842 | ||
1843 | inline void | |
1844 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1845 | Target_i386* target, |
92e059d8 ILT |
1846 | size_t relnum, |
1847 | const elfcpp::Rel<32, false>& rel, | |
1848 | unsigned int r_type, | |
c06b7b0b | 1849 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1850 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1851 | unsigned char* view, |
1852 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1853 | section_size_type view_size) |
92e059d8 ILT |
1854 | { |
1855 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1856 | |
07f397ab ILT |
1857 | const Sized_relobj<32, false>* object = relinfo->object; |
1858 | ||
1859 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1860 | |
8851ecca ILT |
1861 | const bool is_final = |
1862 | (gsym == NULL | |
1863 | ? !parameters->options().output_is_position_independent() | |
1864 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1865 | const tls::Tls_optimization optimized_type |
1866 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1867 | switch (r_type) |
1868 | { | |
56622147 | 1869 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1870 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1871 | { |
07f397ab | 1872 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1873 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1874 | rel, r_type, value, view, | |
1875 | view_size); | |
92e059d8 ILT |
1876 | break; |
1877 | } | |
07f397ab ILT |
1878 | else |
1879 | { | |
c2b45e22 CC |
1880 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1881 | ? GOT_TYPE_TLS_NOFFSET | |
1882 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1883 | unsigned int got_offset; |
1884 | if (gsym != NULL) | |
1885 | { | |
c2b45e22 CC |
1886 | gold_assert(gsym->has_got_offset(got_type)); |
1887 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1888 | } |
1889 | else | |
1890 | { | |
1891 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1892 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1893 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1894 | - target->got_size()); |
1895 | } | |
1896 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1897 | { | |
1898 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1899 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1900 | got_offset, view, view_size); | |
07f397ab ILT |
1901 | break; |
1902 | } | |
1903 | else if (optimized_type == tls::TLSOPT_NONE) | |
1904 | { | |
1905 | // Relocate the field with the offset of the pair of GOT | |
1906 | // entries. | |
1907 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1908 | break; | |
1909 | } | |
1910 | } | |
75f2446e ILT |
1911 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1912 | _("unsupported reloc %u"), | |
1913 | r_type); | |
92e059d8 ILT |
1914 | break; |
1915 | ||
56622147 ILT |
1916 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1917 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 1918 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1919 | if (optimized_type == tls::TLSOPT_TO_LE) |
1920 | { | |
1921 | gold_assert(tls_segment != NULL); | |
1922 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1923 | rel, r_type, value, view, | |
1924 | view_size); | |
1925 | break; | |
1926 | } | |
1927 | else | |
1928 | { | |
1929 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1930 | ? GOT_TYPE_TLS_NOFFSET | |
1931 | : GOT_TYPE_TLS_DESC); | |
1932 | unsigned int got_offset; | |
1933 | if (gsym != NULL) | |
1934 | { | |
1935 | gold_assert(gsym->has_got_offset(got_type)); | |
1936 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1937 | } | |
1938 | else | |
1939 | { | |
1940 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1941 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1942 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1943 | - target->got_size()); | |
1944 | } | |
1945 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1946 | { | |
1947 | gold_assert(tls_segment != NULL); | |
1948 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1949 | got_offset, view, view_size); | |
1950 | break; | |
1951 | } | |
1952 | else if (optimized_type == tls::TLSOPT_NONE) | |
1953 | { | |
1954 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1955 | { | |
1956 | // Relocate the field with the offset of the pair of GOT | |
1957 | // entries. | |
1958 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1959 | } | |
1960 | break; | |
1961 | } | |
1962 | } | |
75f2446e ILT |
1963 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1964 | _("unsupported reloc %u"), | |
1965 | r_type); | |
ead1e424 ILT |
1966 | break; |
1967 | ||
56622147 | 1968 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1969 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1970 | { | |
75f2446e ILT |
1971 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1972 | _("both SUN and GNU model " | |
1973 | "TLS relocations")); | |
1974 | break; | |
46cf9fa2 ILT |
1975 | } |
1976 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1977 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1978 | { |
07f397ab | 1979 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1980 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1981 | value, view, view_size); | |
1982 | break; | |
1983 | } | |
07f397ab ILT |
1984 | else if (optimized_type == tls::TLSOPT_NONE) |
1985 | { | |
1986 | // Relocate the field with the offset of the GOT entry for | |
1987 | // the module index. | |
1988 | unsigned int got_offset; | |
94c4710f ILT |
1989 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1990 | - target->got_size()); | |
07f397ab ILT |
1991 | Relocate_functions<32, false>::rel32(view, got_offset); |
1992 | break; | |
1993 | } | |
75f2446e ILT |
1994 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1995 | _("unsupported reloc %u"), | |
1996 | r_type); | |
46cf9fa2 ILT |
1997 | break; |
1998 | ||
56622147 | 1999 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2000 | // This reloc can appear in debugging sections, in which case we |
2001 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
2002 | // tells us this. | |
497897f9 ILT |
2003 | if (optimized_type == tls::TLSOPT_TO_LE |
2004 | && this->local_dynamic_type_ != LOCAL_DYNAMIC_NONE) | |
94c4710f ILT |
2005 | { |
2006 | gold_assert(tls_segment != NULL); | |
2007 | value -= tls_segment->memsz(); | |
2008 | } | |
46cf9fa2 ILT |
2009 | Relocate_functions<32, false>::rel32(view, value); |
2010 | break; | |
2011 | ||
56622147 ILT |
2012 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2013 | case elfcpp::R_386_TLS_GOTIE: | |
2014 | case elfcpp::R_386_TLS_IE_32: | |
2015 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2016 | { | |
07f397ab | 2017 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2018 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2019 | rel, r_type, value, view, | |
2020 | view_size); | |
2021 | break; | |
2022 | } | |
07f397ab ILT |
2023 | else if (optimized_type == tls::TLSOPT_NONE) |
2024 | { | |
2025 | // Relocate the field with the offset of the GOT entry for | |
2026 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2027 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2028 | ? GOT_TYPE_TLS_OFFSET | |
2029 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2030 | unsigned int got_offset; |
2031 | if (gsym != NULL) | |
2032 | { | |
c2b45e22 CC |
2033 | gold_assert(gsym->has_got_offset(got_type)); |
2034 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2035 | } |
2036 | else | |
2037 | { | |
2038 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2039 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2040 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2041 | } |
2042 | // For the R_386_TLS_IE relocation, we need to apply the | |
2043 | // absolute address of the GOT entry. | |
2044 | if (r_type == elfcpp::R_386_TLS_IE) | |
2045 | got_offset += target->got_plt_section()->address(); | |
2046 | // All GOT offsets are relative to the end of the GOT. | |
2047 | got_offset -= target->got_size(); | |
2048 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2049 | break; | |
2050 | } | |
75f2446e ILT |
2051 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2052 | _("unsupported reloc %u"), | |
2053 | r_type); | |
92e059d8 | 2054 | break; |
92e059d8 | 2055 | |
56622147 | 2056 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2057 | // If we're creating a shared library, a dynamic relocation will |
2058 | // have been created for this location, so do not apply it now. | |
8851ecca | 2059 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2060 | { |
2061 | gold_assert(tls_segment != NULL); | |
2062 | value -= tls_segment->memsz(); | |
2063 | Relocate_functions<32, false>::rel32(view, value); | |
2064 | } | |
56622147 | 2065 | break; |
92e059d8 | 2066 | |
56622147 | 2067 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2068 | // If we're creating a shared library, a dynamic relocation will |
2069 | // have been created for this location, so do not apply it now. | |
8851ecca | 2070 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2071 | { |
2072 | gold_assert(tls_segment != NULL); | |
2073 | value = tls_segment->memsz() - value; | |
2074 | Relocate_functions<32, false>::rel32(view, value); | |
2075 | } | |
56622147 | 2076 | break; |
92e059d8 | 2077 | } |
92e059d8 ILT |
2078 | } |
2079 | ||
e041f13d | 2080 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2081 | // Local-Exec. |
2082 | ||
2083 | inline void | |
2084 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2085 | size_t relnum, | |
2086 | Output_segment* tls_segment, | |
2087 | const elfcpp::Rel<32, false>& rel, | |
2088 | unsigned int, | |
2089 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2090 | unsigned char* view, | |
fe8718a4 | 2091 | section_size_type view_size) |
ead1e424 ILT |
2092 | { |
2093 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2094 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2095 | // leal foo(%reg),%eax; call ___tls_get_addr |
2096 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2097 | ||
af6359d5 ILT |
2098 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2099 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2100 | |
2101 | unsigned char op1 = view[-1]; | |
2102 | unsigned char op2 = view[-2]; | |
2103 | ||
af6359d5 ILT |
2104 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2105 | op2 == 0x8d || op2 == 0x04); | |
2106 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2107 | |
2108 | int roff = 5; | |
2109 | ||
2110 | if (op2 == 0x04) | |
2111 | { | |
af6359d5 ILT |
2112 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2113 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2114 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2115 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2116 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2117 | } | |
2118 | else | |
2119 | { | |
af6359d5 ILT |
2120 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2121 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2122 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2123 | && view[9] == 0x90) |
ead1e424 ILT |
2124 | { |
2125 | // There is a trailing nop. Use the size byte subl. | |
2126 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2127 | roff = 6; | |
2128 | } | |
2129 | else | |
2130 | { | |
2131 | // Use the five byte subl. | |
2132 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2133 | } | |
2134 | } | |
2135 | ||
7bf1f802 | 2136 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2137 | Relocate_functions<32, false>::rel32(view + roff, value); |
2138 | ||
2139 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2140 | // We can skip it. | |
2141 | this->skip_call_tls_get_addr_ = true; | |
2142 | } | |
2143 | ||
7bf1f802 | 2144 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2145 | // Initial-Exec. |
2146 | ||
2147 | inline void | |
2148 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2149 | size_t relnum, | |
c2b45e22 | 2150 | Output_segment*, |
07f397ab ILT |
2151 | const elfcpp::Rel<32, false>& rel, |
2152 | unsigned int, | |
2153 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2154 | unsigned char* view, | |
fe8718a4 | 2155 | section_size_type view_size) |
07f397ab ILT |
2156 | { |
2157 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2158 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2159 | ||
2160 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2161 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2162 | ||
2163 | unsigned char op1 = view[-1]; | |
2164 | unsigned char op2 = view[-2]; | |
2165 | ||
2166 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2167 | op2 == 0x8d || op2 == 0x04); | |
2168 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2169 | ||
2170 | int roff = 5; | |
2171 | ||
c2b45e22 CC |
2172 | // FIXME: For now, support only the first (SIB) form. |
2173 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2174 | |
2175 | if (op2 == 0x04) | |
2176 | { | |
2177 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2178 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2179 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2180 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2181 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2182 | } | |
2183 | else | |
2184 | { | |
2185 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2186 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2187 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2188 | && view[9] == 0x90) |
2189 | { | |
2190 | // FIXME: This is not the right instruction sequence. | |
2191 | // There is a trailing nop. Use the size byte subl. | |
2192 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2193 | roff = 6; | |
2194 | } | |
2195 | else | |
2196 | { | |
2197 | // FIXME: This is not the right instruction sequence. | |
2198 | // Use the five byte subl. | |
2199 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2200 | } | |
2201 | } | |
2202 | ||
07f397ab ILT |
2203 | Relocate_functions<32, false>::rel32(view + roff, value); |
2204 | ||
2205 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2206 | // We can skip it. | |
2207 | this->skip_call_tls_get_addr_ = true; | |
2208 | } | |
2209 | ||
c2b45e22 CC |
2210 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2211 | // General-Dynamic to a Local-Exec. | |
2212 | ||
2213 | inline void | |
2214 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2215 | const Relocate_info<32, false>* relinfo, | |
2216 | size_t relnum, | |
2217 | Output_segment* tls_segment, | |
2218 | const elfcpp::Rel<32, false>& rel, | |
2219 | unsigned int r_type, | |
2220 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2221 | unsigned char* view, | |
2222 | section_size_type view_size) | |
2223 | { | |
2224 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2225 | { | |
2226 | // leal foo@TLSDESC(%ebx), %eax | |
2227 | // ==> leal foo@NTPOFF, %eax | |
2228 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2229 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2230 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2231 | view[-2] == 0x8d && view[-1] == 0x83); | |
2232 | view[-1] = 0x05; | |
2233 | value -= tls_segment->memsz(); | |
2234 | Relocate_functions<32, false>::rel32(view, value); | |
2235 | } | |
2236 | else | |
2237 | { | |
2238 | // call *foo@TLSCALL(%eax) | |
2239 | // ==> nop; nop | |
2240 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2241 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2242 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2243 | view[0] == 0xff && view[1] == 0x10); | |
2244 | view[0] = 0x66; | |
2245 | view[1] = 0x90; | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2250 | // General-Dynamic to an Initial-Exec. | |
2251 | ||
2252 | inline void | |
2253 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2254 | const Relocate_info<32, false>* relinfo, | |
2255 | size_t relnum, | |
2256 | Output_segment*, | |
2257 | const elfcpp::Rel<32, false>& rel, | |
2258 | unsigned int r_type, | |
2259 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2260 | unsigned char* view, | |
2261 | section_size_type view_size) | |
2262 | { | |
2263 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2264 | { | |
2265 | // leal foo@TLSDESC(%ebx), %eax | |
2266 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2267 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2268 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2269 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2270 | view[-2] == 0x8d && view[-1] == 0x83); | |
2271 | view[-2] = 0x8b; | |
2272 | Relocate_functions<32, false>::rel32(view, value); | |
2273 | } | |
2274 | else | |
2275 | { | |
2276 | // call *foo@TLSCALL(%eax) | |
2277 | // ==> nop; nop | |
2278 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2279 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2280 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2281 | view[0] == 0xff && view[1] == 0x10); | |
2282 | view[0] = 0x66; | |
2283 | view[1] = 0x90; | |
2284 | } | |
2285 | } | |
2286 | ||
46cf9fa2 ILT |
2287 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2288 | // Local-Exec. | |
2289 | ||
2290 | inline void | |
2291 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2292 | size_t relnum, | |
2293 | Output_segment*, | |
2294 | const elfcpp::Rel<32, false>& rel, | |
2295 | unsigned int, | |
2296 | elfcpp::Elf_types<32>::Elf_Addr, | |
2297 | unsigned char* view, | |
fe8718a4 | 2298 | section_size_type view_size) |
46cf9fa2 ILT |
2299 | { |
2300 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2301 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2302 | ||
af6359d5 ILT |
2303 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2304 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2305 | |
2306 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2307 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2308 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2309 | |
af6359d5 | 2310 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2311 | |
2312 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2313 | ||
2314 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2315 | // We can skip it. | |
2316 | this->skip_call_tls_get_addr_ = true; | |
2317 | } | |
2318 | ||
56622147 ILT |
2319 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2320 | // Local-Exec. | |
2321 | ||
2322 | inline void | |
2323 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2324 | size_t relnum, | |
2325 | Output_segment* tls_segment, | |
2326 | const elfcpp::Rel<32, false>& rel, | |
2327 | unsigned int r_type, | |
2328 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2329 | unsigned char* view, | |
fe8718a4 | 2330 | section_size_type view_size) |
56622147 ILT |
2331 | { |
2332 | // We have to actually change the instructions, which means that we | |
2333 | // need to examine the opcodes to figure out which instruction we | |
2334 | // are looking at. | |
2335 | if (r_type == elfcpp::R_386_TLS_IE) | |
2336 | { | |
2337 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2338 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2339 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2340 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2341 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2342 | ||
2343 | unsigned char op1 = view[-1]; | |
2344 | if (op1 == 0xa1) | |
2345 | { | |
2346 | // movl XX,%eax ==> movl $YY,%eax | |
2347 | view[-1] = 0xb8; | |
2348 | } | |
2349 | else | |
2350 | { | |
2351 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2352 | ||
2353 | unsigned char op2 = view[-2]; | |
2354 | if (op2 == 0x8b) | |
2355 | { | |
2356 | // movl XX,%reg ==> movl $YY,%reg | |
2357 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2358 | (op1 & 0xc7) == 0x05); | |
2359 | view[-2] = 0xc7; | |
2360 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2361 | } | |
2362 | else if (op2 == 0x03) | |
2363 | { | |
2364 | // addl XX,%reg ==> addl $YY,%reg | |
2365 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2366 | (op1 & 0xc7) == 0x05); | |
2367 | view[-2] = 0x81; | |
2368 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2369 | } | |
2370 | else | |
2371 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2372 | } | |
2373 | } | |
2374 | else | |
2375 | { | |
2376 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2377 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2378 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2379 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2380 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2381 | ||
2382 | unsigned char op1 = view[-1]; | |
2383 | unsigned char op2 = view[-2]; | |
2384 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2385 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2386 | if (op2 == 0x8b) | |
2387 | { | |
2388 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2389 | view[-2] = 0xc7; | |
2390 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2391 | } | |
2392 | else if (op2 == 0x2b) | |
2393 | { | |
2394 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2395 | view[-2] = 0x81; | |
2396 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2397 | } | |
2398 | else if (op2 == 0x03) | |
2399 | { | |
2400 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2401 | view[-2] = 0x81; | |
2402 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2403 | } | |
2404 | else | |
2405 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2406 | } | |
2407 | ||
7bf1f802 | 2408 | value = tls_segment->memsz() - value; |
56622147 ILT |
2409 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2410 | value = - value; | |
2411 | ||
2412 | Relocate_functions<32, false>::rel32(view, value); | |
2413 | } | |
2414 | ||
61ba1cf9 ILT |
2415 | // Relocate section data. |
2416 | ||
2417 | void | |
92e059d8 | 2418 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2419 | unsigned int sh_type, |
2420 | const unsigned char* prelocs, | |
2421 | size_t reloc_count, | |
730cdc88 ILT |
2422 | Output_section* output_section, |
2423 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2424 | unsigned char* view, |
2425 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2426 | section_size_type view_size) |
61ba1cf9 | 2427 | { |
a3ad94ed | 2428 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2429 | |
ead1e424 ILT |
2430 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2431 | Target_i386::Relocate>( | |
92e059d8 | 2432 | relinfo, |
ead1e424 | 2433 | this, |
61ba1cf9 ILT |
2434 | prelocs, |
2435 | reloc_count, | |
730cdc88 ILT |
2436 | output_section, |
2437 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2438 | view, |
2439 | address, | |
2440 | view_size); | |
2441 | } | |
2442 | ||
6a74a719 ILT |
2443 | // Return the size of a relocation while scanning during a relocatable |
2444 | // link. | |
2445 | ||
2446 | unsigned int | |
2447 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2448 | unsigned int r_type, | |
2449 | Relobj* object) | |
2450 | { | |
2451 | switch (r_type) | |
2452 | { | |
2453 | case elfcpp::R_386_NONE: | |
2454 | case elfcpp::R_386_GNU_VTINHERIT: | |
2455 | case elfcpp::R_386_GNU_VTENTRY: | |
2456 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2457 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2458 | case elfcpp::R_386_TLS_DESC_CALL: | |
2459 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2460 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2461 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2462 | case elfcpp::R_386_TLS_IE_32: | |
2463 | case elfcpp::R_386_TLS_GOTIE: | |
2464 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2465 | case elfcpp::R_386_TLS_LE_32: | |
2466 | return 0; | |
2467 | ||
2468 | case elfcpp::R_386_32: | |
2469 | case elfcpp::R_386_PC32: | |
2470 | case elfcpp::R_386_GOT32: | |
2471 | case elfcpp::R_386_PLT32: | |
2472 | case elfcpp::R_386_GOTOFF: | |
2473 | case elfcpp::R_386_GOTPC: | |
2474 | return 4; | |
2475 | ||
2476 | case elfcpp::R_386_16: | |
2477 | case elfcpp::R_386_PC16: | |
2478 | return 2; | |
2479 | ||
2480 | case elfcpp::R_386_8: | |
2481 | case elfcpp::R_386_PC8: | |
2482 | return 1; | |
2483 | ||
2484 | // These are relocations which should only be seen by the | |
2485 | // dynamic linker, and should never be seen here. | |
2486 | case elfcpp::R_386_COPY: | |
2487 | case elfcpp::R_386_GLOB_DAT: | |
2488 | case elfcpp::R_386_JUMP_SLOT: | |
2489 | case elfcpp::R_386_RELATIVE: | |
2490 | case elfcpp::R_386_TLS_TPOFF: | |
2491 | case elfcpp::R_386_TLS_DTPMOD32: | |
2492 | case elfcpp::R_386_TLS_DTPOFF32: | |
2493 | case elfcpp::R_386_TLS_TPOFF32: | |
2494 | case elfcpp::R_386_TLS_DESC: | |
2495 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2496 | return 0; | |
2497 | ||
2498 | case elfcpp::R_386_32PLT: | |
2499 | case elfcpp::R_386_TLS_GD_32: | |
2500 | case elfcpp::R_386_TLS_GD_PUSH: | |
2501 | case elfcpp::R_386_TLS_GD_CALL: | |
2502 | case elfcpp::R_386_TLS_GD_POP: | |
2503 | case elfcpp::R_386_TLS_LDM_32: | |
2504 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2505 | case elfcpp::R_386_TLS_LDM_CALL: | |
2506 | case elfcpp::R_386_TLS_LDM_POP: | |
2507 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2508 | default: | |
2509 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2510 | return 0; | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | // Scan the relocs during a relocatable link. | |
2515 | ||
2516 | void | |
2517 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2518 | Symbol_table* symtab, | |
2519 | Layout* layout, | |
2520 | Sized_relobj<32, false>* object, | |
2521 | unsigned int data_shndx, | |
2522 | unsigned int sh_type, | |
2523 | const unsigned char* prelocs, | |
2524 | size_t reloc_count, | |
2525 | Output_section* output_section, | |
2526 | bool needs_special_offset_handling, | |
2527 | size_t local_symbol_count, | |
2528 | const unsigned char* plocal_symbols, | |
2529 | Relocatable_relocs* rr) | |
2530 | { | |
2531 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2532 | ||
2533 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2534 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2535 | ||
7019cd25 | 2536 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2537 | Scan_relocatable_relocs>( |
2538 | options, | |
2539 | symtab, | |
2540 | layout, | |
2541 | object, | |
2542 | data_shndx, | |
2543 | prelocs, | |
2544 | reloc_count, | |
2545 | output_section, | |
2546 | needs_special_offset_handling, | |
2547 | local_symbol_count, | |
2548 | plocal_symbols, | |
2549 | rr); | |
2550 | } | |
2551 | ||
2552 | // Relocate a section during a relocatable link. | |
2553 | ||
2554 | void | |
2555 | Target_i386::relocate_for_relocatable( | |
2556 | const Relocate_info<32, false>* relinfo, | |
2557 | unsigned int sh_type, | |
2558 | const unsigned char* prelocs, | |
2559 | size_t reloc_count, | |
2560 | Output_section* output_section, | |
2561 | off_t offset_in_output_section, | |
2562 | const Relocatable_relocs* rr, | |
2563 | unsigned char* view, | |
2564 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2565 | section_size_type view_size, | |
2566 | unsigned char* reloc_view, | |
2567 | section_size_type reloc_view_size) | |
2568 | { | |
2569 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2570 | ||
7019cd25 | 2571 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2572 | relinfo, |
2573 | prelocs, | |
2574 | reloc_count, | |
2575 | output_section, | |
2576 | offset_in_output_section, | |
2577 | rr, | |
2578 | view, | |
2579 | view_address, | |
2580 | view_size, | |
2581 | reloc_view, | |
2582 | reloc_view_size); | |
2583 | } | |
2584 | ||
ab5c9e90 ILT |
2585 | // Return the value to use for a dynamic which requires special |
2586 | // treatment. This is how we support equality comparisons of function | |
2587 | // pointers across shared library boundaries, as described in the | |
2588 | // processor specific ABI supplement. | |
2589 | ||
2590 | uint64_t | |
2591 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2592 | { | |
2593 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2594 | return this->plt_section()->address() + gsym->plt_offset(); | |
2595 | } | |
2596 | ||
c51e6221 ILT |
2597 | // Return a string used to fill a code section with nops to take up |
2598 | // the specified length. | |
2599 | ||
2600 | std::string | |
8851ecca | 2601 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2602 | { |
2603 | if (length >= 16) | |
2604 | { | |
2605 | // Build a jmp instruction to skip over the bytes. | |
2606 | unsigned char jmp[5]; | |
2607 | jmp[0] = 0xe9; | |
2608 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2609 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2610 | + std::string(length - 5, '\0')); | |
2611 | } | |
2612 | ||
2613 | // Nop sequences of various lengths. | |
2614 | const char nop1[1] = { 0x90 }; // nop | |
2615 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2616 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2617 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2618 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2619 | 0x00 }; // leal 0(%esi,1),%esi | |
2620 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2621 | 0x00, 0x00 }; | |
2622 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2623 | 0x00, 0x00, 0x00 }; | |
2624 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2625 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2626 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2627 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2628 | 0x00 }; | |
2629 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2630 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2631 | 0x00, 0x00 }; | |
2632 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2633 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2634 | 0x00, 0x00, 0x00 }; | |
2635 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2636 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2637 | 0x00, 0x00, 0x00, 0x00 }; | |
2638 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2639 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2640 | 0x27, 0x00, 0x00, 0x00, | |
2641 | 0x00 }; | |
2642 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2643 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2644 | 0xbc, 0x27, 0x00, 0x00, | |
2645 | 0x00, 0x00 }; | |
2646 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2647 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2648 | 0x90, 0x90, 0x90, 0x90, | |
2649 | 0x90, 0x90, 0x90 }; | |
2650 | ||
2651 | const char* nops[16] = { | |
2652 | NULL, | |
2653 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2654 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2655 | }; | |
2656 | ||
2657 | return std::string(nops[length], length); | |
2658 | } | |
2659 | ||
14bfc3f5 ILT |
2660 | // The selector for i386 object files. |
2661 | ||
2662 | class Target_selector_i386 : public Target_selector | |
2663 | { | |
2664 | public: | |
2665 | Target_selector_i386() | |
e96caa79 | 2666 | : Target_selector(elfcpp::EM_386, 32, false, "elf32-i386") |
14bfc3f5 ILT |
2667 | { } |
2668 | ||
2669 | Target* | |
e96caa79 ILT |
2670 | do_instantiate_target() |
2671 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2672 | }; |
2673 | ||
14bfc3f5 ILT |
2674 | Target_selector_i386 target_selector_i386; |
2675 | ||
2676 | } // End anonymous namespace. |