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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
b90efa5b | 3 | // Copyright (C) 2006-2015 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" |
07a60597 | 28 | #include "dwarf.h" |
7e1edb90 | 29 | #include "parameters.h" |
92e059d8 | 30 | #include "reloc.h" |
61ba1cf9 ILT |
31 | #include "i386.h" |
32 | #include "object.h" | |
ead1e424 | 33 | #include "symtab.h" |
92e059d8 ILT |
34 | #include "layout.h" |
35 | #include "output.h" | |
12c0daef | 36 | #include "copy-relocs.h" |
14bfc3f5 | 37 | #include "target.h" |
61ba1cf9 | 38 | #include "target-reloc.h" |
14bfc3f5 | 39 | #include "target-select.h" |
af6359d5 | 40 | #include "tls.h" |
36959681 | 41 | #include "freebsd.h" |
2e702c99 | 42 | #include "nacl.h" |
f345227a | 43 | #include "gc.h" |
14bfc3f5 ILT |
44 | |
45 | namespace | |
46 | { | |
47 | ||
48 | using namespace gold; | |
49 | ||
57b2284c CC |
50 | // A class to handle the .got.plt section. |
51 | ||
52 | class Output_data_got_plt_i386 : public Output_section_data_build | |
53 | { | |
54 | public: | |
55 | Output_data_got_plt_i386(Layout* layout) | |
56 | : Output_section_data_build(4), | |
57 | layout_(layout) | |
58 | { } | |
59 | ||
60 | protected: | |
61 | // Write out the PLT data. | |
62 | void | |
63 | do_write(Output_file*); | |
64 | ||
65 | // Write to a map file. | |
66 | void | |
67 | do_print_to_mapfile(Mapfile* mapfile) const | |
68 | { mapfile->print_output_data(this, "** GOT PLT"); } | |
69 | ||
70 | private: | |
71 | // A pointer to the Layout class, so that we can find the .dynamic | |
72 | // section when we write out the GOT PLT section. | |
73 | Layout* layout_; | |
74 | }; | |
75 | ||
7223e9ca | 76 | // A class to handle the PLT data. |
2e702c99 RM |
77 | // This is an abstract base class that handles most of the linker details |
78 | // but does not know the actual contents of PLT entries. The derived | |
79 | // classes below fill in those details. | |
7223e9ca ILT |
80 | |
81 | class Output_data_plt_i386 : public Output_section_data | |
82 | { | |
83 | public: | |
84 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
85 | ||
2e702c99 | 86 | Output_data_plt_i386(Layout*, uint64_t addralign, |
57b2284c | 87 | Output_data_got_plt_i386*, Output_data_space*); |
7223e9ca ILT |
88 | |
89 | // Add an entry to the PLT. | |
90 | void | |
67181c72 | 91 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
92 | |
93 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
94 | unsigned int | |
67181c72 ILT |
95 | add_local_ifunc_entry(Symbol_table*, Layout*, |
96 | Sized_relobj_file<32, false>* relobj, | |
7223e9ca ILT |
97 | unsigned int local_sym_index); |
98 | ||
99 | // Return the .rel.plt section data. | |
100 | Reloc_section* | |
101 | rel_plt() const | |
102 | { return this->rel_; } | |
103 | ||
104 | // Return where the TLS_DESC relocations should go. | |
105 | Reloc_section* | |
106 | rel_tls_desc(Layout*); | |
107 | ||
67181c72 ILT |
108 | // Return where the IRELATIVE relocations should go. |
109 | Reloc_section* | |
110 | rel_irelative(Symbol_table*, Layout*); | |
111 | ||
112 | // Return whether we created a section for IRELATIVE relocations. | |
113 | bool | |
114 | has_irelative_section() const | |
115 | { return this->irelative_rel_ != NULL; } | |
116 | ||
7223e9ca ILT |
117 | // Return the number of PLT entries. |
118 | unsigned int | |
119 | entry_count() const | |
67181c72 | 120 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
121 | |
122 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 123 | unsigned int |
7223e9ca | 124 | first_plt_entry_offset() |
2e702c99 | 125 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
126 | |
127 | // Return the size of a PLT entry. | |
2e702c99 RM |
128 | unsigned int |
129 | get_plt_entry_size() const | |
130 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 131 | |
67181c72 ILT |
132 | // Return the PLT address to use for a global symbol. |
133 | uint64_t | |
134 | address_for_global(const Symbol*); | |
135 | ||
136 | // Return the PLT address to use for a local symbol. | |
137 | uint64_t | |
138 | address_for_local(const Relobj*, unsigned int symndx); | |
139 | ||
2e702c99 | 140 | // Add .eh_frame information for the PLT. |
7223e9ca | 141 | void |
2e702c99 RM |
142 | add_eh_frame(Layout* layout) |
143 | { this->do_add_eh_frame(layout); } | |
7223e9ca | 144 | |
2e702c99 RM |
145 | protected: |
146 | // Fill the first PLT entry, given the pointer to the PLT section data | |
147 | // and the runtime address of the GOT. | |
7223e9ca | 148 | void |
2e702c99 RM |
149 | fill_first_plt_entry(unsigned char* pov, |
150 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
151 | { this->do_fill_first_plt_entry(pov, got_address); } | |
152 | ||
153 | // Fill a normal PLT entry, given the pointer to the entry's data in the | |
154 | // section, the runtime address of the GOT, the offset into the GOT of | |
155 | // the corresponding slot, the offset into the relocation section of the | |
156 | // corresponding reloc, and the offset of this entry within the whole | |
157 | // PLT. Return the offset from this PLT entry's runtime address that | |
158 | // should be used to compute the initial value of the GOT slot. | |
159 | unsigned int | |
160 | fill_plt_entry(unsigned char* pov, | |
161 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
162 | unsigned int got_offset, | |
163 | unsigned int plt_offset, | |
164 | unsigned int plt_rel_offset) | |
165 | { | |
166 | return this->do_fill_plt_entry(pov, got_address, got_offset, | |
167 | plt_offset, plt_rel_offset); | |
168 | } | |
7223e9ca | 169 | |
2e702c99 RM |
170 | virtual unsigned int |
171 | do_get_plt_entry_size() const = 0; | |
7223e9ca | 172 | |
2e702c99 RM |
173 | virtual void |
174 | do_fill_first_plt_entry(unsigned char* pov, | |
175 | elfcpp::Elf_types<32>::Elf_Addr got_address) = 0; | |
7223e9ca | 176 | |
2e702c99 RM |
177 | virtual unsigned int |
178 | do_fill_plt_entry(unsigned char* pov, | |
179 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
180 | unsigned int got_offset, | |
181 | unsigned int plt_offset, | |
182 | unsigned int plt_rel_offset) = 0; | |
7223e9ca | 183 | |
2e702c99 RM |
184 | virtual void |
185 | do_add_eh_frame(Layout*) = 0; | |
7223e9ca | 186 | |
2e702c99 RM |
187 | void |
188 | do_adjust_output_section(Output_section* os); | |
189 | ||
190 | // Write to a map file. | |
191 | void | |
192 | do_print_to_mapfile(Mapfile* mapfile) const | |
193 | { mapfile->print_output_data(this, _("** PLT")); } | |
07a60597 ILT |
194 | |
195 | // The .eh_frame unwind information for the PLT. | |
2e702c99 | 196 | // The CIE is common across variants of the PLT format. |
07a60597 | 197 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 198 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 199 | |
2e702c99 | 200 | private: |
7223e9ca ILT |
201 | // Set the final size. |
202 | void | |
203 | set_final_data_size() | |
67181c72 ILT |
204 | { |
205 | this->set_data_size((this->count_ + this->irelative_count_ + 1) | |
2e702c99 | 206 | * this->get_plt_entry_size()); |
67181c72 | 207 | } |
7223e9ca ILT |
208 | |
209 | // Write out the PLT data. | |
210 | void | |
211 | do_write(Output_file*); | |
212 | ||
213 | // We keep a list of global STT_GNU_IFUNC symbols, each with its | |
214 | // offset in the GOT. | |
215 | struct Global_ifunc | |
216 | { | |
217 | Symbol* sym; | |
218 | unsigned int got_offset; | |
219 | }; | |
220 | ||
221 | // We keep a list of local STT_GNU_IFUNC symbols, each with its | |
222 | // offset in the GOT. | |
223 | struct Local_ifunc | |
224 | { | |
6fa2a40b | 225 | Sized_relobj_file<32, false>* object; |
7223e9ca ILT |
226 | unsigned int local_sym_index; |
227 | unsigned int got_offset; | |
228 | }; | |
229 | ||
230 | // The reloc section. | |
231 | Reloc_section* rel_; | |
232 | // The TLS_DESC relocations, if necessary. These must follow the | |
233 | // regular PLT relocs. | |
234 | Reloc_section* tls_desc_rel_; | |
67181c72 ILT |
235 | // The IRELATIVE relocations, if necessary. These must follow the |
236 | // regular relocatoins and the TLS_DESC relocations. | |
237 | Reloc_section* irelative_rel_; | |
7223e9ca | 238 | // The .got.plt section. |
57b2284c | 239 | Output_data_got_plt_i386* got_plt_; |
67181c72 ILT |
240 | // The part of the .got.plt section used for IRELATIVE relocs. |
241 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
242 | // The number of PLT entries. |
243 | unsigned int count_; | |
67181c72 ILT |
244 | // Number of PLT entries with R_386_IRELATIVE relocs. These follow |
245 | // the regular PLT entries. | |
246 | unsigned int irelative_count_; | |
7223e9ca ILT |
247 | // Global STT_GNU_IFUNC symbols. |
248 | std::vector<Global_ifunc> global_ifuncs_; | |
249 | // Local STT_GNU_IFUNC symbols. | |
250 | std::vector<Local_ifunc> local_ifuncs_; | |
251 | }; | |
a3ad94ed | 252 | |
2e702c99 RM |
253 | // This is an abstract class for the standard PLT layout. |
254 | // The derived classes below handle the actual PLT contents | |
255 | // for the executable (non-PIC) and shared-library (PIC) cases. | |
256 | // The unwind information is uniform across those two, so it's here. | |
257 | ||
258 | class Output_data_plt_i386_standard : public Output_data_plt_i386 | |
259 | { | |
260 | public: | |
261 | Output_data_plt_i386_standard(Layout* layout, | |
57b2284c | 262 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
263 | Output_data_space* got_irelative) |
264 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
265 | { } | |
266 | ||
267 | protected: | |
268 | virtual unsigned int | |
269 | do_get_plt_entry_size() const | |
270 | { return plt_entry_size; } | |
271 | ||
272 | virtual void | |
273 | do_add_eh_frame(Layout* layout) | |
274 | { | |
275 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
276 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
277 | } | |
278 | ||
279 | // The size of an entry in the PLT. | |
280 | static const int plt_entry_size = 16; | |
281 | ||
282 | // The .eh_frame unwind information for the PLT. | |
283 | static const int plt_eh_frame_fde_size = 32; | |
284 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
285 | }; | |
286 | ||
287 | // Actually fill the PLT contents for an executable (non-PIC). | |
288 | ||
289 | class Output_data_plt_i386_exec : public Output_data_plt_i386_standard | |
290 | { | |
291 | public: | |
292 | Output_data_plt_i386_exec(Layout* layout, | |
57b2284c | 293 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
294 | Output_data_space* got_irelative) |
295 | : Output_data_plt_i386_standard(layout, got_plt, got_irelative) | |
296 | { } | |
297 | ||
298 | protected: | |
299 | virtual void | |
300 | do_fill_first_plt_entry(unsigned char* pov, | |
301 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
302 | ||
303 | virtual unsigned int | |
304 | do_fill_plt_entry(unsigned char* pov, | |
305 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
306 | unsigned int got_offset, | |
307 | unsigned int plt_offset, | |
308 | unsigned int plt_rel_offset); | |
309 | ||
310 | private: | |
311 | // The first entry in the PLT for an executable. | |
312 | static const unsigned char first_plt_entry[plt_entry_size]; | |
313 | ||
314 | // Other entries in the PLT for an executable. | |
315 | static const unsigned char plt_entry[plt_entry_size]; | |
316 | }; | |
317 | ||
318 | // Actually fill the PLT contents for a shared library (PIC). | |
319 | ||
320 | class Output_data_plt_i386_dyn : public Output_data_plt_i386_standard | |
321 | { | |
322 | public: | |
323 | Output_data_plt_i386_dyn(Layout* layout, | |
57b2284c | 324 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
325 | Output_data_space* got_irelative) |
326 | : Output_data_plt_i386_standard(layout, got_plt, got_irelative) | |
327 | { } | |
328 | ||
329 | protected: | |
330 | virtual void | |
331 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
332 | ||
333 | virtual unsigned int | |
334 | do_fill_plt_entry(unsigned char* pov, | |
335 | elfcpp::Elf_types<32>::Elf_Addr, | |
336 | unsigned int got_offset, | |
337 | unsigned int plt_offset, | |
338 | unsigned int plt_rel_offset); | |
339 | ||
340 | private: | |
341 | // The first entry in the PLT for a shared object. | |
342 | static const unsigned char first_plt_entry[plt_entry_size]; | |
343 | ||
344 | // Other entries in the PLT for a shared object. | |
345 | static const unsigned char plt_entry[plt_entry_size]; | |
346 | }; | |
347 | ||
14bfc3f5 | 348 | // The i386 target class. |
e041f13d ILT |
349 | // TLS info comes from |
350 | // http://people.redhat.com/drepper/tls.pdf | |
351 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 352 | |
200b2bb9 | 353 | class Target_i386 : public Sized_target<32, false> |
14bfc3f5 ILT |
354 | { |
355 | public: | |
5a6f7e2d ILT |
356 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
357 | ||
2e702c99 RM |
358 | Target_i386(const Target::Target_info* info = &i386_info) |
359 | : Sized_target<32, false>(info), | |
67181c72 ILT |
360 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
361 | got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL), | |
43819297 | 362 | rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY), |
edfbb029 | 363 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 364 | { } |
75f65a3e | 365 | |
2e702c99 | 366 | // Process the relocations to determine unreferenced sections for |
6d03d481 ST |
367 | // garbage collection. |
368 | void | |
ad0f2072 | 369 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
370 | Layout* layout, |
371 | Sized_relobj_file<32, false>* object, | |
372 | unsigned int data_shndx, | |
373 | unsigned int sh_type, | |
374 | const unsigned char* prelocs, | |
375 | size_t reloc_count, | |
376 | Output_section* output_section, | |
377 | bool needs_special_offset_handling, | |
378 | size_t local_symbol_count, | |
379 | const unsigned char* plocal_symbols); | |
6d03d481 | 380 | |
92e059d8 | 381 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 382 | void |
ad0f2072 | 383 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 384 | Layout* layout, |
6fa2a40b | 385 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 386 | unsigned int data_shndx, |
92e059d8 ILT |
387 | unsigned int sh_type, |
388 | const unsigned char* prelocs, | |
389 | size_t reloc_count, | |
730cdc88 ILT |
390 | Output_section* output_section, |
391 | bool needs_special_offset_handling, | |
92e059d8 | 392 | size_t local_symbol_count, |
730cdc88 | 393 | const unsigned char* plocal_symbols); |
61ba1cf9 | 394 | |
5a6f7e2d ILT |
395 | // Finalize the sections. |
396 | void | |
f59f41f3 | 397 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 398 | |
ab5c9e90 ILT |
399 | // Return the value to use for a dynamic which requires special |
400 | // treatment. | |
401 | uint64_t | |
402 | do_dynsym_value(const Symbol*) const; | |
403 | ||
92e059d8 ILT |
404 | // Relocate a section. |
405 | void | |
406 | relocate_section(const Relocate_info<32, false>*, | |
407 | unsigned int sh_type, | |
408 | const unsigned char* prelocs, | |
409 | size_t reloc_count, | |
730cdc88 ILT |
410 | Output_section* output_section, |
411 | bool needs_special_offset_handling, | |
92e059d8 ILT |
412 | unsigned char* view, |
413 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
414 | section_size_type view_size, |
415 | const Reloc_symbol_changes*); | |
92e059d8 | 416 | |
6a74a719 ILT |
417 | // Scan the relocs during a relocatable link. |
418 | void | |
ad0f2072 | 419 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 420 | Layout* layout, |
6fa2a40b | 421 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
422 | unsigned int data_shndx, |
423 | unsigned int sh_type, | |
424 | const unsigned char* prelocs, | |
425 | size_t reloc_count, | |
426 | Output_section* output_section, | |
427 | bool needs_special_offset_handling, | |
428 | size_t local_symbol_count, | |
429 | const unsigned char* plocal_symbols, | |
430 | Relocatable_relocs*); | |
431 | ||
7404fe1b | 432 | // Emit relocations for a section. |
6a74a719 | 433 | void |
7404fe1b AM |
434 | relocate_relocs(const Relocate_info<32, false>*, |
435 | unsigned int sh_type, | |
436 | const unsigned char* prelocs, | |
437 | size_t reloc_count, | |
438 | Output_section* output_section, | |
cc928013 | 439 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
7404fe1b AM |
440 | const Relocatable_relocs*, |
441 | unsigned char* view, | |
442 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
443 | section_size_type view_size, | |
444 | unsigned char* reloc_view, | |
445 | section_size_type reloc_view_size); | |
6a74a719 | 446 | |
c51e6221 ILT |
447 | // Return a string used to fill a code section with nops. |
448 | std::string | |
8851ecca | 449 | do_code_fill(section_size_type length) const; |
c51e6221 | 450 | |
9a2d6984 ILT |
451 | // Return whether SYM is defined by the ABI. |
452 | bool | |
9c2d0ef9 | 453 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
454 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
455 | ||
bb04269c DK |
456 | // Return whether a symbol name implies a local label. The UnixWare |
457 | // 2.1 cc generates temporary symbols that start with .X, so we | |
458 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
459 | // If so, we should move the .X recognition into | |
460 | // Target::do_is_local_label_name. | |
461 | bool | |
462 | do_is_local_label_name(const char* name) const | |
463 | { | |
464 | if (name[0] == '.' && name[1] == 'X') | |
465 | return true; | |
466 | return Target::do_is_local_label_name(name); | |
467 | } | |
468 | ||
67181c72 ILT |
469 | // Return the PLT address to use for a global symbol. |
470 | uint64_t | |
471 | do_plt_address_for_global(const Symbol* gsym) const | |
472 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 473 | |
67181c72 ILT |
474 | uint64_t |
475 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
476 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 477 | |
b3ce541e ILT |
478 | // We can tell whether we take the address of a function. |
479 | inline bool | |
480 | do_can_check_for_function_pointers() const | |
481 | { return true; } | |
482 | ||
02d7cd44 ILT |
483 | // Return the base for a DW_EH_PE_datarel encoding. |
484 | uint64_t | |
485 | do_ehframe_datarel_base() const; | |
486 | ||
b6848d3c ILT |
487 | // Return whether SYM is call to a non-split function. |
488 | bool | |
489 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
490 | ||
9b547ce6 | 491 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
492 | void |
493 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
494 | section_offset_type fnoffset, section_size_type fnsize, | |
495 | unsigned char* view, section_size_type view_size, | |
496 | std::string* from, std::string* to) const; | |
497 | ||
96f2030e | 498 | // Return the size of the GOT section. |
fe8718a4 | 499 | section_size_type |
0e70b911 | 500 | got_size() const |
96f2030e ILT |
501 | { |
502 | gold_assert(this->got_ != NULL); | |
503 | return this->got_->data_size(); | |
504 | } | |
505 | ||
0e70b911 CC |
506 | // Return the number of entries in the GOT. |
507 | unsigned int | |
508 | got_entry_count() const | |
509 | { | |
510 | if (this->got_ == NULL) | |
511 | return 0; | |
512 | return this->got_size() / 4; | |
513 | } | |
514 | ||
515 | // Return the number of entries in the PLT. | |
516 | unsigned int | |
517 | plt_entry_count() const; | |
518 | ||
519 | // Return the offset of the first non-reserved PLT entry. | |
520 | unsigned int | |
521 | first_plt_entry_offset() const; | |
522 | ||
523 | // Return the size of each PLT entry. | |
524 | unsigned int | |
525 | plt_entry_size() const; | |
526 | ||
2e702c99 RM |
527 | protected: |
528 | // Instantiate the plt_ member. | |
529 | // This chooses the right PLT flavor for an executable or a shared object. | |
530 | Output_data_plt_i386* | |
531 | make_data_plt(Layout* layout, | |
57b2284c | 532 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
533 | Output_data_space* got_irelative, |
534 | bool dyn) | |
535 | { return this->do_make_data_plt(layout, got_plt, got_irelative, dyn); } | |
536 | ||
537 | virtual Output_data_plt_i386* | |
538 | do_make_data_plt(Layout* layout, | |
57b2284c | 539 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
540 | Output_data_space* got_irelative, |
541 | bool dyn) | |
542 | { | |
543 | if (dyn) | |
544 | return new Output_data_plt_i386_dyn(layout, got_plt, got_irelative); | |
545 | else | |
546 | return new Output_data_plt_i386_exec(layout, got_plt, got_irelative); | |
547 | } | |
548 | ||
92e059d8 ILT |
549 | private: |
550 | // The class which scans relocations. | |
551 | struct Scan | |
61ba1cf9 | 552 | { |
95a2c8d6 RS |
553 | static inline int |
554 | ||
555 | get_reference_flags(unsigned int r_type); | |
556 | ||
61ba1cf9 | 557 | inline void |
ad0f2072 | 558 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 559 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 560 | unsigned int data_shndx, |
07f397ab | 561 | Output_section* output_section, |
92e059d8 | 562 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
563 | const elfcpp::Sym<32, false>& lsym, |
564 | bool is_discarded); | |
61ba1cf9 | 565 | |
92e059d8 | 566 | inline void |
ad0f2072 | 567 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 568 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 569 | unsigned int data_shndx, |
07f397ab | 570 | Output_section* output_section, |
92e059d8 ILT |
571 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
572 | Symbol* gsym); | |
af6359d5 | 573 | |
21bb3914 | 574 | inline bool |
0897ed3b | 575 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
2e702c99 RM |
576 | Target_i386* target, |
577 | Sized_relobj_file<32, false>* object, | |
578 | unsigned int data_shndx, | |
579 | Output_section* output_section, | |
580 | const elfcpp::Rel<32, false>& reloc, | |
0897ed3b | 581 | unsigned int r_type, |
2e702c99 | 582 | const elfcpp::Sym<32, false>& lsym); |
0897ed3b ST |
583 | |
584 | inline bool | |
585 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
586 | Target_i386* target, | |
2e702c99 RM |
587 | Sized_relobj_file<32, false>* object, |
588 | unsigned int data_shndx, | |
589 | Output_section* output_section, | |
0897ed3b ST |
590 | const elfcpp::Rel<32, false>& reloc, |
591 | unsigned int r_type, | |
2e702c99 | 592 | Symbol* gsym); |
21bb3914 ST |
593 | |
594 | inline bool | |
0897ed3b | 595 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 596 | |
7223e9ca | 597 | bool |
6fa2a40b CC |
598 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
599 | unsigned int r_type); | |
7223e9ca | 600 | |
af6359d5 | 601 | static void |
6fa2a40b | 602 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
603 | |
604 | static void | |
6fa2a40b | 605 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 606 | Symbol*); |
61ba1cf9 ILT |
607 | }; |
608 | ||
92e059d8 ILT |
609 | // The class which implements relocation. |
610 | class Relocate | |
611 | { | |
612 | public: | |
ead1e424 | 613 | Relocate() |
46cf9fa2 | 614 | : skip_call_tls_get_addr_(false), |
82bb573a | 615 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
616 | { } |
617 | ||
618 | ~Relocate() | |
619 | { | |
620 | if (this->skip_call_tls_get_addr_) | |
621 | { | |
622 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 623 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
624 | } |
625 | } | |
626 | ||
86849f1f ILT |
627 | // Return whether the static relocation needs to be applied. |
628 | inline bool | |
629 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
630 | unsigned int r_type, |
631 | bool is_32bit, | |
031cdbed | 632 | Output_section* output_section); |
86849f1f | 633 | |
ead1e424 ILT |
634 | // Do a relocation. Return false if the caller should not issue |
635 | // any warnings about this relocation. | |
636 | inline bool | |
031cdbed ILT |
637 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
638 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 639 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 640 | const Symbol_value<32>*, |
92e059d8 | 641 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 642 | section_size_type); |
92e059d8 ILT |
643 | |
644 | private: | |
645 | // Do a TLS relocation. | |
ead1e424 | 646 | inline void |
07f397ab | 647 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
2e702c99 | 648 | size_t relnum, const elfcpp::Rel<32, false>&, |
c06b7b0b | 649 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 650 | const Symbol_value<32>*, |
fe8718a4 ILT |
651 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
652 | section_size_type); | |
92e059d8 | 653 | |
07f397ab ILT |
654 | // Do a TLS General-Dynamic to Initial-Exec transition. |
655 | inline void | |
656 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
657 | Output_segment* tls_segment, | |
658 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
659 | elfcpp::Elf_types<32>::Elf_Addr value, | |
660 | unsigned char* view, | |
fe8718a4 | 661 | section_size_type view_size); |
07f397ab | 662 | |
56622147 ILT |
663 | // Do a TLS General-Dynamic to Local-Exec transition. |
664 | inline void | |
665 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
666 | Output_segment* tls_segment, |
667 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
668 | elfcpp::Elf_types<32>::Elf_Addr value, | |
669 | unsigned char* view, | |
fe8718a4 | 670 | section_size_type view_size); |
92e059d8 | 671 | |
c2b45e22 CC |
672 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
673 | // transition. | |
674 | inline void | |
675 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
676 | Output_segment* tls_segment, | |
677 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
678 | elfcpp::Elf_types<32>::Elf_Addr value, | |
679 | unsigned char* view, | |
680 | section_size_type view_size); | |
681 | ||
682 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
683 | // transition. | |
684 | inline void | |
685 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
686 | Output_segment* tls_segment, | |
687 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
688 | elfcpp::Elf_types<32>::Elf_Addr value, | |
689 | unsigned char* view, | |
690 | section_size_type view_size); | |
691 | ||
56622147 | 692 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 693 | inline void |
56622147 | 694 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
695 | Output_segment* tls_segment, |
696 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
697 | elfcpp::Elf_types<32>::Elf_Addr value, | |
698 | unsigned char* view, | |
fe8718a4 | 699 | section_size_type view_size); |
ead1e424 | 700 | |
56622147 ILT |
701 | // Do a TLS Initial-Exec to Local-Exec transition. |
702 | static inline void | |
703 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
704 | Output_segment* tls_segment, |
705 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
706 | elfcpp::Elf_types<32>::Elf_Addr value, | |
707 | unsigned char* view, | |
fe8718a4 | 708 | section_size_type view_size); |
46cf9fa2 | 709 | |
46cf9fa2 ILT |
710 | // We need to keep track of which type of local dynamic relocation |
711 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
712 | enum Local_dynamic_type | |
713 | { | |
714 | LOCAL_DYNAMIC_NONE, | |
715 | LOCAL_DYNAMIC_SUN, | |
716 | LOCAL_DYNAMIC_GNU | |
717 | }; | |
718 | ||
ead1e424 ILT |
719 | // This is set if we should skip the next reloc, which should be a |
720 | // PLT32 reloc against ___tls_get_addr. | |
721 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
722 | // The type of local dynamic relocation we have seen in the section |
723 | // being relocated, if any. | |
724 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
725 | }; |
726 | ||
6a74a719 ILT |
727 | // A class which returns the size required for a relocation type, |
728 | // used while scanning relocs during a relocatable link. | |
729 | class Relocatable_size_for_reloc | |
730 | { | |
731 | public: | |
732 | unsigned int | |
733 | get_size_for_reloc(unsigned int, Relobj*); | |
734 | }; | |
735 | ||
92e059d8 ILT |
736 | // Adjust TLS relocation type based on the options and whether this |
737 | // is a local symbol. | |
af6359d5 | 738 | static tls::Tls_optimization |
7e1edb90 | 739 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 740 | |
c4fc4724 IT |
741 | // Check if relocation against this symbol is a candidate for |
742 | // conversion from | |
743 | // mov foo@GOT(%reg), %reg | |
744 | // to | |
745 | // lea foo@GOTOFF(%reg), %reg. | |
746 | static bool | |
747 | can_convert_mov_to_lea(const Symbol* gsym) | |
748 | { | |
749 | gold_assert(gsym != NULL); | |
750 | return (gsym->type() != elfcpp::STT_GNU_IFUNC | |
751 | && !gsym->is_undefined () | |
752 | && !gsym->is_from_dynobj() | |
753 | && !gsym->is_preemptible() | |
754 | && (!parameters->options().shared() | |
755 | || (gsym->visibility() != elfcpp::STV_DEFAULT | |
756 | && gsym->visibility() != elfcpp::STV_PROTECTED) | |
757 | || parameters->options().Bsymbolic()) | |
758 | && strcmp(gsym->name(), "_DYNAMIC") != 0); | |
759 | } | |
760 | ||
ead1e424 | 761 | // Get the GOT section, creating it if necessary. |
dbe717ef | 762 | Output_data_got<32, false>* |
7e1edb90 | 763 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 764 | |
96f2030e | 765 | // Get the GOT PLT section. |
57b2284c | 766 | Output_data_got_plt_i386* |
96f2030e ILT |
767 | got_plt_section() const |
768 | { | |
769 | gold_assert(this->got_plt_ != NULL); | |
770 | return this->got_plt_; | |
771 | } | |
772 | ||
a8df5856 ILT |
773 | // Get the GOT section for TLSDESC entries. |
774 | Output_data_got<32, false>* | |
775 | got_tlsdesc_section() const | |
776 | { | |
777 | gold_assert(this->got_tlsdesc_ != NULL); | |
778 | return this->got_tlsdesc_; | |
779 | } | |
780 | ||
7223e9ca ILT |
781 | // Create the PLT section. |
782 | void | |
783 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
784 | ||
a3ad94ed ILT |
785 | // Create a PLT entry for a global symbol. |
786 | void | |
7e1edb90 | 787 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 788 | |
7223e9ca ILT |
789 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
790 | void | |
791 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 792 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
793 | unsigned int local_sym_index); |
794 | ||
9fa33bee | 795 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
796 | void |
797 | define_tls_base_symbol(Symbol_table*, Layout*); | |
798 | ||
94c4710f ILT |
799 | // Create a GOT entry for the TLS module index. |
800 | unsigned int | |
801 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 802 | Sized_relobj_file<32, false>* object); |
94c4710f | 803 | |
a3ad94ed | 804 | // Get the PLT section. |
e291e7b9 | 805 | Output_data_plt_i386* |
a3ad94ed ILT |
806 | plt_section() const |
807 | { | |
808 | gold_assert(this->plt_ != NULL); | |
809 | return this->plt_; | |
810 | } | |
811 | ||
5a6f7e2d ILT |
812 | // Get the dynamic reloc section, creating it if necessary. |
813 | Reloc_section* | |
814 | rel_dyn_section(Layout*); | |
815 | ||
e291e7b9 ILT |
816 | // Get the section to use for TLS_DESC relocations. |
817 | Reloc_section* | |
818 | rel_tls_desc_section(Layout*) const; | |
819 | ||
67181c72 ILT |
820 | // Get the section to use for IRELATIVE relocations. |
821 | Reloc_section* | |
822 | rel_irelative_section(Layout*); | |
823 | ||
12c0daef | 824 | // Add a potential copy relocation. |
a3ad94ed | 825 | void |
ef9beddf | 826 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 827 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
828 | unsigned int shndx, Output_section* output_section, |
829 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
830 | { | |
831 | this->copy_relocs_.copy_reloc(symtab, layout, | |
832 | symtab->get_sized_symbol<32>(sym), | |
833 | object, shndx, output_section, reloc, | |
834 | this->rel_dyn_section(layout)); | |
835 | } | |
ead1e424 | 836 | |
92e059d8 ILT |
837 | // Information about this specific target which we pass to the |
838 | // general Target structure. | |
75f65a3e | 839 | static const Target::Target_info i386_info; |
ead1e424 | 840 | |
0a65a3a7 | 841 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
842 | // These values are exposed to the ABI in an incremental link. |
843 | // Do not renumber existing values without changing the version | |
844 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
845 | enum Got_type |
846 | { | |
847 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
848 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
849 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
850 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
851 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
852 | }; |
853 | ||
ead1e424 | 854 | // The GOT section. |
dbe717ef | 855 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
856 | // The PLT section. |
857 | Output_data_plt_i386* plt_; | |
858 | // The GOT PLT section. | |
57b2284c | 859 | Output_data_got_plt_i386* got_plt_; |
67181c72 ILT |
860 | // The GOT section for IRELATIVE relocations. |
861 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
862 | // The GOT section for TLSDESC relocations. |
863 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
864 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
865 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
866 | // The dynamic reloc section. |
867 | Reloc_section* rel_dyn_; | |
67181c72 ILT |
868 | // The section to use for IRELATIVE relocs. |
869 | Reloc_section* rel_irelative_; | |
5a6f7e2d | 870 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 871 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
c2b45e22 | 872 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 873 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
874 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
875 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
876 | }; |
877 | ||
878 | const Target::Target_info Target_i386::i386_info = | |
879 | { | |
61ba1cf9 ILT |
880 | 32, // size |
881 | false, // is_big_endian | |
882 | elfcpp::EM_386, // machine_code | |
883 | false, // has_make_symbol | |
dbe717ef | 884 | false, // has_resolve |
c51e6221 | 885 | true, // has_code_fill |
35cdfc9a | 886 | true, // is_default_stack_executable |
b3ce541e | 887 | true, // can_icf_inline_merge_sections |
0864d551 | 888 | '\0', // wrap_char |
dbe717ef | 889 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 890 | 0x08048000, // default_text_segment_address |
cd72c291 | 891 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 892 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
893 | false, // isolate_execinstr |
894 | 0, // rosegment_gap | |
8a5e3e08 ILT |
895 | elfcpp::SHN_UNDEF, // small_common_shndx |
896 | elfcpp::SHN_UNDEF, // large_common_shndx | |
897 | 0, // small_common_section_flags | |
05a352e6 DK |
898 | 0, // large_common_section_flags |
899 | NULL, // attributes_section | |
a67858e0 CC |
900 | NULL, // attributes_vendor |
901 | "_start" // entry_symbol_name | |
14bfc3f5 ILT |
902 | }; |
903 | ||
ead1e424 ILT |
904 | // Get the GOT section, creating it if necessary. |
905 | ||
dbe717ef | 906 | Output_data_got<32, false>* |
7e1edb90 | 907 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
908 | { |
909 | if (this->got_ == NULL) | |
910 | { | |
7e1edb90 | 911 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 912 | |
7e1edb90 | 913 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 914 | |
9446efde ILT |
915 | // When using -z now, we can treat .got.plt as a relro section. |
916 | // Without -z now, it is modified after program startup by lazy | |
917 | // PLT relocations. | |
918 | bool is_got_plt_relro = parameters->options().now(); | |
919 | Output_section_order got_order = (is_got_plt_relro | |
920 | ? ORDER_RELRO | |
921 | : ORDER_RELRO_LAST); | |
922 | Output_section_order got_plt_order = (is_got_plt_relro | |
923 | ? ORDER_RELRO | |
924 | : ORDER_NON_RELRO_FIRST); | |
925 | ||
82742395 ILT |
926 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
927 | (elfcpp::SHF_ALLOC | |
928 | | elfcpp::SHF_WRITE), | |
9446efde | 929 | this->got_, got_order, true); |
ead1e424 | 930 | |
57b2284c | 931 | this->got_plt_ = new Output_data_got_plt_i386(layout); |
82742395 ILT |
932 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
933 | (elfcpp::SHF_ALLOC | |
934 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
935 | this->got_plt_, got_plt_order, |
936 | is_got_plt_relro); | |
a3ad94ed | 937 | |
ead1e424 | 938 | // The first three entries are reserved. |
27bc2bce | 939 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 940 | |
9446efde ILT |
941 | if (!is_got_plt_relro) |
942 | { | |
943 | // Those bytes can go into the relro segment. | |
944 | layout->increase_relro(3 * 4); | |
945 | } | |
1a2dff53 | 946 | |
a3ad94ed | 947 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
948 | this->global_offset_table_ = |
949 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
950 | Symbol_table::PREDEFINED, | |
951 | this->got_plt_, | |
952 | 0, 0, elfcpp::STT_OBJECT, | |
953 | elfcpp::STB_LOCAL, | |
954 | elfcpp::STV_HIDDEN, 0, | |
955 | false, false); | |
a8df5856 | 956 | |
67181c72 ILT |
957 | // If there are any IRELATIVE relocations, they get GOT entries |
958 | // in .got.plt after the jump slot relocations. | |
959 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
960 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
961 | (elfcpp::SHF_ALLOC | |
962 | | elfcpp::SHF_WRITE), | |
963 | this->got_irelative_, | |
9446efde | 964 | got_plt_order, is_got_plt_relro); |
67181c72 | 965 | |
a8df5856 ILT |
966 | // If there are any TLSDESC relocations, they get GOT entries in |
967 | // .got.plt after the jump slot entries. | |
968 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
969 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
970 | (elfcpp::SHF_ALLOC | |
971 | | elfcpp::SHF_WRITE), | |
22f0da72 | 972 | this->got_tlsdesc_, |
9446efde | 973 | got_plt_order, is_got_plt_relro); |
ead1e424 | 974 | } |
a3ad94ed | 975 | |
ead1e424 ILT |
976 | return this->got_; |
977 | } | |
978 | ||
5a6f7e2d ILT |
979 | // Get the dynamic reloc section, creating it if necessary. |
980 | ||
981 | Target_i386::Reloc_section* | |
982 | Target_i386::rel_dyn_section(Layout* layout) | |
983 | { | |
984 | if (this->rel_dyn_ == NULL) | |
985 | { | |
986 | gold_assert(layout != NULL); | |
d98bc257 | 987 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 988 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
989 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
990 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
991 | } |
992 | return this->rel_dyn_; | |
993 | } | |
994 | ||
67181c72 ILT |
995 | // Get the section to use for IRELATIVE relocs, creating it if |
996 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
997 | // relocations. They need to follow the other dynamic relocations so | |
998 | // that they can refer to global variables initialized by those | |
999 | // relocs. | |
1000 | ||
1001 | Target_i386::Reloc_section* | |
1002 | Target_i386::rel_irelative_section(Layout* layout) | |
1003 | { | |
1004 | if (this->rel_irelative_ == NULL) | |
1005 | { | |
1006 | // Make sure we have already create the dynamic reloc section. | |
1007 | this->rel_dyn_section(layout); | |
1008 | this->rel_irelative_ = new Reloc_section(false); | |
1009 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1010 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
1011 | ORDER_DYNAMIC_RELOCS, false); | |
1012 | gold_assert(this->rel_dyn_->output_section() | |
1013 | == this->rel_irelative_->output_section()); | |
1014 | } | |
1015 | return this->rel_irelative_; | |
1016 | } | |
1017 | ||
57b2284c CC |
1018 | // Write the first three reserved words of the .got.plt section. |
1019 | // The remainder of the section is written while writing the PLT | |
1020 | // in Output_data_plt_i386::do_write. | |
1021 | ||
1022 | void | |
1023 | Output_data_got_plt_i386::do_write(Output_file* of) | |
1024 | { | |
1025 | // The first entry in the GOT is the address of the .dynamic section | |
1026 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1027 | // We saved space for them when we created the section in | |
1028 | // Target_i386::got_section. | |
1029 | const off_t got_file_offset = this->offset(); | |
1030 | gold_assert(this->data_size() >= 12); | |
1031 | unsigned char* const got_view = of->get_output_view(got_file_offset, 12); | |
1032 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1033 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1034 | elfcpp::Swap<32, false>::writeval(got_view, dynamic_addr); | |
1035 | memset(got_view + 4, 0, 8); | |
1036 | of->write_output_view(got_file_offset, 12, got_view); | |
1037 | } | |
1038 | ||
a3ad94ed ILT |
1039 | // Create the PLT section. The ordinary .got section is an argument, |
1040 | // since we need to refer to the start. We also create our own .got | |
1041 | // section just for PLT entries. | |
1042 | ||
67181c72 | 1043 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
2e702c99 | 1044 | uint64_t addralign, |
57b2284c | 1045 | Output_data_got_plt_i386* got_plt, |
67181c72 | 1046 | Output_data_space* got_irelative) |
2e702c99 | 1047 | : Output_section_data(addralign), |
57b2284c CC |
1048 | tls_desc_rel_(NULL), irelative_rel_(NULL), got_plt_(got_plt), |
1049 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
1050 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 1051 | { |
d98bc257 | 1052 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 1053 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
1054 | elfcpp::SHF_ALLOC, this->rel_, |
1055 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
a3ad94ed ILT |
1056 | } |
1057 | ||
16649710 ILT |
1058 | void |
1059 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
1060 | { | |
1061 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
1062 | // linker, and so do we. | |
1063 | os->set_entsize(4); | |
1064 | } | |
1065 | ||
a3ad94ed ILT |
1066 | // Add an entry to the PLT. |
1067 | ||
1068 | void | |
67181c72 ILT |
1069 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
1070 | Symbol* gsym) | |
a3ad94ed ILT |
1071 | { |
1072 | gold_assert(!gsym->has_plt_offset()); | |
1073 | ||
a3ad94ed | 1074 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
1075 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1076 | && gsym->can_use_relative_reloc(false)) | |
1077 | { | |
2e702c99 | 1078 | gsym->set_plt_offset(this->irelative_count_ * this->get_plt_entry_size()); |
67181c72 ILT |
1079 | ++this->irelative_count_; |
1080 | section_offset_type got_offset = | |
1081 | this->got_irelative_->current_data_size(); | |
1082 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
1083 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
1084 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
1085 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1086 | struct Global_ifunc gi; |
1087 | gi.sym = gsym; | |
1088 | gi.got_offset = got_offset; | |
1089 | this->global_ifuncs_.push_back(gi); | |
1090 | } | |
1091 | else | |
1092 | { | |
67181c72 ILT |
1093 | // When setting the PLT offset we skip the initial reserved PLT |
1094 | // entry. | |
2e702c99 | 1095 | gsym->set_plt_offset((this->count_ + 1) * this->get_plt_entry_size()); |
67181c72 ILT |
1096 | |
1097 | ++this->count_; | |
1098 | ||
1099 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
1100 | ||
1101 | // Every PLT entry needs a GOT entry which points back to the | |
1102 | // PLT entry (this will be changed by the dynamic linker, | |
1103 | // normally lazily when the function is called). | |
1104 | this->got_plt_->set_current_data_size(got_offset + 4); | |
1105 | ||
7223e9ca ILT |
1106 | gsym->set_needs_dynsym_entry(); |
1107 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
1108 | got_offset); | |
1109 | } | |
a3ad94ed ILT |
1110 | |
1111 | // Note that we don't need to save the symbol. The contents of the | |
1112 | // PLT are independent of which symbols are used. The symbols only | |
1113 | // appear in the relocations. | |
1114 | } | |
1115 | ||
7223e9ca ILT |
1116 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1117 | // the PLT offset. | |
1118 | ||
1119 | unsigned int | |
6fa2a40b | 1120 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
1121 | Symbol_table* symtab, |
1122 | Layout* layout, | |
6fa2a40b CC |
1123 | Sized_relobj_file<32, false>* relobj, |
1124 | unsigned int local_sym_index) | |
7223e9ca | 1125 | { |
2e702c99 | 1126 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1127 | ++this->irelative_count_; |
7223e9ca | 1128 | |
67181c72 | 1129 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1130 | |
1131 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1132 | // entry. | |
67181c72 | 1133 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
1134 | |
1135 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1136 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
1137 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
1138 | elfcpp::R_386_IRELATIVE, | |
1139 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1140 | |
1141 | struct Local_ifunc li; | |
1142 | li.object = relobj; | |
1143 | li.local_sym_index = local_sym_index; | |
1144 | li.got_offset = got_offset; | |
1145 | this->local_ifuncs_.push_back(li); | |
1146 | ||
1147 | return plt_offset; | |
1148 | } | |
1149 | ||
e291e7b9 ILT |
1150 | // Return where the TLS_DESC relocations should go, creating it if |
1151 | // necessary. These follow the JUMP_SLOT relocations. | |
1152 | ||
1153 | Output_data_plt_i386::Reloc_section* | |
1154 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
1155 | { | |
1156 | if (this->tls_desc_rel_ == NULL) | |
1157 | { | |
1158 | this->tls_desc_rel_ = new Reloc_section(false); | |
1159 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1160 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 1161 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1162 | gold_assert(this->tls_desc_rel_->output_section() |
1163 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1164 | } |
1165 | return this->tls_desc_rel_; | |
1166 | } | |
1167 | ||
67181c72 ILT |
1168 | // Return where the IRELATIVE relocations should go in the PLT. These |
1169 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
1170 | ||
1171 | Output_data_plt_i386::Reloc_section* | |
1172 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
1173 | { | |
1174 | if (this->irelative_rel_ == NULL) | |
1175 | { | |
1176 | // Make sure we have a place for the TLS_DESC relocations, in | |
1177 | // case we see any later on. | |
1178 | this->rel_tls_desc(layout); | |
1179 | this->irelative_rel_ = new Reloc_section(false); | |
1180 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1181 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1182 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1183 | gold_assert(this->irelative_rel_->output_section() | |
1184 | == this->rel_->output_section()); | |
1185 | ||
1186 | if (parameters->doing_static_link()) | |
1187 | { | |
1188 | // A statically linked executable will only have a .rel.plt | |
1189 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
1190 | // symbols. The library will use these symbols to locate | |
1191 | // the IRELATIVE relocs at program startup time. | |
1192 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
1193 | Symbol_table::PREDEFINED, | |
1194 | this->irelative_rel_, 0, 0, | |
1195 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1196 | elfcpp::STV_HIDDEN, 0, false, true); | |
1197 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
1198 | Symbol_table::PREDEFINED, | |
1199 | this->irelative_rel_, 0, 0, | |
1200 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1201 | elfcpp::STV_HIDDEN, 0, true, true); | |
1202 | } | |
1203 | } | |
1204 | return this->irelative_rel_; | |
1205 | } | |
1206 | ||
1207 | // Return the PLT address to use for a global symbol. | |
1208 | ||
1209 | uint64_t | |
1210 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
1211 | { | |
1212 | uint64_t offset = 0; | |
1213 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1214 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1215 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1216 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1217 | } |
1218 | ||
1219 | // Return the PLT address to use for a local symbol. These are always | |
1220 | // IRELATIVE relocs. | |
1221 | ||
1222 | uint64_t | |
19fec8c1 AM |
1223 | Output_data_plt_i386::address_for_local(const Relobj* object, |
1224 | unsigned int r_sym) | |
67181c72 | 1225 | { |
19fec8c1 AM |
1226 | return (this->address() |
1227 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1228 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1229 | } |
1230 | ||
a3ad94ed ILT |
1231 | // The first entry in the PLT for an executable. |
1232 | ||
2e702c99 | 1233 | const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1234 | { |
1235 | 0xff, 0x35, // pushl contents of memory address | |
1236 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1237 | 0xff, 0x25, // jmp indirect | |
1238 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1239 | 0, 0, 0, 0 // unused | |
1240 | }; | |
1241 | ||
2e702c99 RM |
1242 | void |
1243 | Output_data_plt_i386_exec::do_fill_first_plt_entry( | |
1244 | unsigned char* pov, | |
1245 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
1246 | { | |
1247 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1248 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1249 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1250 | } | |
1251 | ||
a3ad94ed ILT |
1252 | // The first entry in the PLT for a shared object. |
1253 | ||
2e702c99 | 1254 | const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1255 | { |
1256 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1257 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1258 | 0, 0, 0, 0 // unused | |
1259 | }; | |
1260 | ||
2e702c99 RM |
1261 | void |
1262 | Output_data_plt_i386_dyn::do_fill_first_plt_entry( | |
1263 | unsigned char* pov, | |
1264 | elfcpp::Elf_types<32>::Elf_Addr) | |
1265 | { | |
1266 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1267 | } | |
1268 | ||
a3ad94ed ILT |
1269 | // Subsequent entries in the PLT for an executable. |
1270 | ||
2e702c99 | 1271 | const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1272 | { |
1273 | 0xff, 0x25, // jmp indirect | |
1274 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1275 | 0x68, // pushl immediate | |
1276 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1277 | 0xe9, // jmp relative | |
1278 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1279 | }; | |
1280 | ||
2e702c99 RM |
1281 | unsigned int |
1282 | Output_data_plt_i386_exec::do_fill_plt_entry( | |
1283 | unsigned char* pov, | |
1284 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
1285 | unsigned int got_offset, | |
1286 | unsigned int plt_offset, | |
1287 | unsigned int plt_rel_offset) | |
1288 | { | |
1289 | memcpy(pov, plt_entry, plt_entry_size); | |
1290 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1291 | got_address + got_offset); | |
1292 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1293 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1294 | return 6; | |
1295 | } | |
1296 | ||
a3ad94ed ILT |
1297 | // Subsequent entries in the PLT for a shared object. |
1298 | ||
2e702c99 | 1299 | const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1300 | { |
1301 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1302 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1303 | 0x68, // pushl immediate | |
1304 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1305 | 0xe9, // jmp relative | |
1306 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1307 | }; | |
1308 | ||
2e702c99 RM |
1309 | unsigned int |
1310 | Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov, | |
1311 | elfcpp::Elf_types<32>::Elf_Addr, | |
1312 | unsigned int got_offset, | |
1313 | unsigned int plt_offset, | |
1314 | unsigned int plt_rel_offset) | |
1315 | { | |
1316 | memcpy(pov, plt_entry, plt_entry_size); | |
1317 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1318 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1319 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1320 | return 6; | |
1321 | } | |
1322 | ||
07a60597 ILT |
1323 | // The .eh_frame unwind information for the PLT. |
1324 | ||
1325 | const unsigned char | |
1326 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1327 | { | |
1328 | 1, // CIE version. | |
1329 | 'z', // Augmentation: augmentation size included. | |
1330 | 'R', // Augmentation: FDE encoding included. | |
1331 | '\0', // End of augmentation string. | |
1332 | 1, // Code alignment factor. | |
1333 | 0x7c, // Data alignment factor. | |
1334 | 8, // Return address column. | |
1335 | 1, // Augmentation size. | |
1336 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1337 | | elfcpp::DW_EH_PE_sdata4), | |
1338 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1339 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1340 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1341 | elfcpp::DW_CFA_nop | |
1342 | }; | |
1343 | ||
1344 | const unsigned char | |
2e702c99 | 1345 | Output_data_plt_i386_standard::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1346 | { |
1347 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1348 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1349 | 0, // Augmentation size. | |
1350 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1351 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1352 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1353 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1354 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1355 | 11, // Block length. | |
1356 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1357 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1358 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1359 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1360 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1361 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1362 | elfcpp::DW_OP_lit2, // Push 2. | |
1363 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1364 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1365 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1366 | elfcpp::DW_CFA_nop, | |
1367 | elfcpp::DW_CFA_nop, | |
1368 | elfcpp::DW_CFA_nop | |
1369 | }; | |
1370 | ||
a3ad94ed ILT |
1371 | // Write out the PLT. This uses the hand-coded instructions above, |
1372 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1373 | // Processor Supplement. | |
1374 | ||
1375 | void | |
1376 | Output_data_plt_i386::do_write(Output_file* of) | |
1377 | { | |
2ea97941 | 1378 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1379 | const section_size_type oview_size = |
1380 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1381 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1382 | |
1383 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1384 | gold_assert(parameters->incremental_update() |
1385 | || (got_file_offset + this->got_plt_->data_size() | |
1386 | == this->got_irelative_->offset())); | |
fe8718a4 | 1387 | const section_size_type got_size = |
67181c72 ILT |
1388 | convert_to_section_size_type(this->got_plt_->data_size() |
1389 | + this->got_irelative_->data_size()); | |
57b2284c | 1390 | |
a3ad94ed ILT |
1391 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1392 | got_size); | |
1393 | ||
1394 | unsigned char* pov = oview; | |
1395 | ||
1396 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1397 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1398 | ||
2e702c99 RM |
1399 | this->fill_first_plt_entry(pov, got_address); |
1400 | pov += this->get_plt_entry_size(); | |
a3ad94ed | 1401 | |
57b2284c CC |
1402 | // The first three entries in the GOT are reserved, and are written |
1403 | // by Output_data_got_plt_i386::do_write. | |
1404 | unsigned char* got_pov = got_view + 12; | |
a3ad94ed ILT |
1405 | |
1406 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1407 | ||
2e702c99 | 1408 | unsigned int plt_offset = this->get_plt_entry_size(); |
a3ad94ed ILT |
1409 | unsigned int plt_rel_offset = 0; |
1410 | unsigned int got_offset = 12; | |
67181c72 | 1411 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1412 | for (unsigned int i = 0; |
1413 | i < count; | |
1414 | ++i, | |
2e702c99 | 1415 | pov += this->get_plt_entry_size(), |
a3ad94ed | 1416 | got_pov += 4, |
2e702c99 | 1417 | plt_offset += this->get_plt_entry_size(), |
a3ad94ed ILT |
1418 | plt_rel_offset += rel_size, |
1419 | got_offset += 4) | |
1420 | { | |
1421 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1422 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1423 | got_address, | |
1424 | got_offset, | |
1425 | plt_offset, | |
1426 | plt_rel_offset); | |
a3ad94ed ILT |
1427 | |
1428 | // Set the entry in the GOT. | |
2e702c99 RM |
1429 | elfcpp::Swap<32, false>::writeval(got_pov, |
1430 | plt_address + plt_offset + lazy_offset); | |
a3ad94ed ILT |
1431 | } |
1432 | ||
7223e9ca ILT |
1433 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1434 | // the GOT to point to the actual symbol value, rather than point to | |
1435 | // the PLT entry. That will let the dynamic linker call the right | |
1436 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1437 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1438 | for (std::vector<Global_ifunc>::const_iterator p = |
1439 | this->global_ifuncs_.begin(); | |
1440 | p != this->global_ifuncs_.end(); | |
1441 | ++p) | |
1442 | { | |
1443 | const Sized_symbol<32>* ssym = | |
1444 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1445 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1446 | ssym->value()); |
1447 | } | |
1448 | ||
1449 | for (std::vector<Local_ifunc>::const_iterator p = | |
1450 | this->local_ifuncs_.begin(); | |
1451 | p != this->local_ifuncs_.end(); | |
1452 | ++p) | |
1453 | { | |
1454 | const Symbol_value<32>* psymval = | |
1455 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1456 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1457 | psymval->value(p->object, 0)); |
1458 | } | |
1459 | ||
fe8718a4 ILT |
1460 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1461 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1462 | |
2ea97941 | 1463 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1464 | of->write_output_view(got_file_offset, got_size, got_view); |
1465 | } | |
1466 | ||
7223e9ca | 1467 | // Create the PLT section. |
a3ad94ed ILT |
1468 | |
1469 | void | |
7223e9ca | 1470 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1471 | { |
a3ad94ed ILT |
1472 | if (this->plt_ == NULL) |
1473 | { | |
1474 | // Create the GOT sections first. | |
7e1edb90 | 1475 | this->got_section(symtab, layout); |
a3ad94ed | 1476 | |
2e702c99 RM |
1477 | const bool dyn = parameters->options().output_is_position_independent(); |
1478 | this->plt_ = this->make_data_plt(layout, | |
1479 | this->got_plt_, | |
1480 | this->got_irelative_, | |
1481 | dyn); | |
1482 | ||
1483 | // Add unwind information if requested. | |
1484 | if (parameters->options().ld_generated_unwind_info()) | |
1485 | this->plt_->add_eh_frame(layout); | |
1486 | ||
16649710 ILT |
1487 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1488 | (elfcpp::SHF_ALLOC | |
1489 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1490 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1491 | |
1492 | // Make the sh_info field of .rel.plt point to .plt. | |
1493 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1494 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1495 | } |
7223e9ca | 1496 | } |
a3ad94ed | 1497 | |
7223e9ca ILT |
1498 | // Create a PLT entry for a global symbol. |
1499 | ||
1500 | void | |
1501 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1502 | { | |
1503 | if (gsym->has_plt_offset()) | |
1504 | return; | |
1505 | if (this->plt_ == NULL) | |
1506 | this->make_plt_section(symtab, layout); | |
67181c72 | 1507 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1508 | } |
1509 | ||
7223e9ca ILT |
1510 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1511 | ||
1512 | void | |
1513 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1514 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1515 | unsigned int local_sym_index) |
1516 | { | |
1517 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1518 | return; | |
1519 | if (this->plt_ == NULL) | |
1520 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1521 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1522 | relobj, | |
7223e9ca ILT |
1523 | local_sym_index); |
1524 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1525 | } | |
1526 | ||
0e70b911 CC |
1527 | // Return the number of entries in the PLT. |
1528 | ||
1529 | unsigned int | |
1530 | Target_i386::plt_entry_count() const | |
1531 | { | |
1532 | if (this->plt_ == NULL) | |
1533 | return 0; | |
1534 | return this->plt_->entry_count(); | |
1535 | } | |
1536 | ||
1537 | // Return the offset of the first non-reserved PLT entry. | |
1538 | ||
1539 | unsigned int | |
1540 | Target_i386::first_plt_entry_offset() const | |
1541 | { | |
2e702c99 | 1542 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1543 | } |
1544 | ||
1545 | // Return the size of each PLT entry. | |
1546 | ||
1547 | unsigned int | |
1548 | Target_i386::plt_entry_size() const | |
1549 | { | |
2e702c99 | 1550 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1551 | } |
1552 | ||
e291e7b9 ILT |
1553 | // Get the section to use for TLS_DESC relocations. |
1554 | ||
1555 | Target_i386::Reloc_section* | |
1556 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1557 | { | |
1558 | return this->plt_section()->rel_tls_desc(layout); | |
1559 | } | |
1560 | ||
9fa33bee | 1561 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1562 | |
1563 | void | |
1564 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1565 | { | |
1566 | if (this->tls_base_symbol_defined_) | |
1567 | return; | |
1568 | ||
1569 | Output_segment* tls_segment = layout->tls_segment(); | |
1570 | if (tls_segment != NULL) | |
1571 | { | |
183fd0e3 | 1572 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1573 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1574 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1575 | tls_segment, 0, 0, |
1576 | elfcpp::STT_TLS, | |
1577 | elfcpp::STB_LOCAL, | |
1578 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1579 | (is_exec |
1580 | ? Symbol::SEGMENT_END | |
1581 | : Symbol::SEGMENT_START), | |
1582 | true); | |
edfbb029 CC |
1583 | } |
1584 | this->tls_base_symbol_defined_ = true; | |
1585 | } | |
1586 | ||
94c4710f ILT |
1587 | // Create a GOT entry for the TLS module index. |
1588 | ||
1589 | unsigned int | |
1590 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2e702c99 | 1591 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1592 | { |
1593 | if (this->got_mod_index_offset_ == -1U) | |
1594 | { | |
1595 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1596 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1597 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1598 | unsigned int got_offset = got->add_constant(0); | |
1599 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
2e702c99 | 1600 | got_offset); |
009a67a2 | 1601 | got->add_constant(0); |
94c4710f ILT |
1602 | this->got_mod_index_offset_ = got_offset; |
1603 | } | |
1604 | return this->got_mod_index_offset_; | |
1605 | } | |
1606 | ||
92e059d8 | 1607 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1608 | // symbol. IS_FINAL is true if the final address of this symbol is |
1609 | // known at link time. | |
92e059d8 | 1610 | |
af6359d5 | 1611 | tls::Tls_optimization |
7e1edb90 | 1612 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1613 | { |
1614 | // If we are generating a shared library, then we can't do anything | |
1615 | // in the linker. | |
8851ecca | 1616 | if (parameters->options().shared()) |
af6359d5 | 1617 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1618 | |
1619 | switch (r_type) | |
1620 | { | |
1621 | case elfcpp::R_386_TLS_GD: | |
1622 | case elfcpp::R_386_TLS_GOTDESC: | |
1623 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1624 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1625 | // access. Since we know that we are generating an executable, |
1626 | // we can convert this to Initial-Exec. If we also know that | |
1627 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1628 | if (is_final) |
af6359d5 ILT |
1629 | return tls::TLSOPT_TO_LE; |
1630 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1631 | |
1632 | case elfcpp::R_386_TLS_LDM: | |
1633 | // This is Local-Dynamic, which refers to a local symbol in the | |
1634 | // dynamic TLS block. Since we know that we generating an | |
1635 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1636 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1637 | |
1638 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1639 | // Another type of Local-Dynamic relocation. |
1640 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1641 | |
1642 | case elfcpp::R_386_TLS_IE: | |
1643 | case elfcpp::R_386_TLS_GOTIE: | |
1644 | case elfcpp::R_386_TLS_IE_32: | |
1645 | // These are Initial-Exec relocs which get the thread offset | |
1646 | // from the GOT. If we know that we are linking against the | |
1647 | // local symbol, we can switch to Local-Exec, which links the | |
1648 | // thread offset into the instruction. | |
a3ad94ed | 1649 | if (is_final) |
af6359d5 ILT |
1650 | return tls::TLSOPT_TO_LE; |
1651 | return tls::TLSOPT_NONE; | |
8462ae85 | 1652 | |
92e059d8 ILT |
1653 | case elfcpp::R_386_TLS_LE: |
1654 | case elfcpp::R_386_TLS_LE_32: | |
1655 | // When we already have Local-Exec, there is nothing further we | |
1656 | // can do. | |
af6359d5 | 1657 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1658 | |
1659 | default: | |
a3ad94ed | 1660 | gold_unreachable(); |
92e059d8 ILT |
1661 | } |
1662 | } | |
1663 | ||
95a2c8d6 | 1664 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1665 | |
95a2c8d6 RS |
1666 | int |
1667 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1668 | { |
1669 | switch (r_type) | |
1670 | { | |
1671 | case elfcpp::R_386_NONE: | |
1672 | case elfcpp::R_386_GNU_VTINHERIT: | |
1673 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1674 | case elfcpp::R_386_GOTPC: |
1675 | // No symbol reference. | |
1676 | return 0; | |
7223e9ca ILT |
1677 | |
1678 | case elfcpp::R_386_32: | |
1679 | case elfcpp::R_386_16: | |
1680 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1681 | return Symbol::ABSOLUTE_REF; |
1682 | ||
7223e9ca ILT |
1683 | case elfcpp::R_386_PC32: |
1684 | case elfcpp::R_386_PC16: | |
1685 | case elfcpp::R_386_PC8: | |
7223e9ca | 1686 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1687 | return Symbol::RELATIVE_REF; |
1688 | ||
1689 | case elfcpp::R_386_PLT32: | |
1690 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1691 | ||
7223e9ca | 1692 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1693 | // Absolute in GOT. |
1694 | return Symbol::ABSOLUTE_REF; | |
1695 | ||
1696 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1697 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1698 | case elfcpp::R_386_TLS_DESC_CALL: | |
1699 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1700 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1701 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1702 | case elfcpp::R_386_TLS_IE_32: | |
1703 | case elfcpp::R_386_TLS_GOTIE: | |
1704 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1705 | case elfcpp::R_386_TLS_LE_32: | |
1706 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1707 | |
1708 | case elfcpp::R_386_COPY: | |
1709 | case elfcpp::R_386_GLOB_DAT: | |
1710 | case elfcpp::R_386_JUMP_SLOT: | |
1711 | case elfcpp::R_386_RELATIVE: | |
1712 | case elfcpp::R_386_IRELATIVE: | |
1713 | case elfcpp::R_386_TLS_TPOFF: | |
1714 | case elfcpp::R_386_TLS_DTPMOD32: | |
1715 | case elfcpp::R_386_TLS_DTPOFF32: | |
1716 | case elfcpp::R_386_TLS_TPOFF32: | |
1717 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1718 | case elfcpp::R_386_32PLT: |
1719 | case elfcpp::R_386_TLS_GD_32: | |
1720 | case elfcpp::R_386_TLS_GD_PUSH: | |
1721 | case elfcpp::R_386_TLS_GD_CALL: | |
1722 | case elfcpp::R_386_TLS_GD_POP: | |
1723 | case elfcpp::R_386_TLS_LDM_32: | |
1724 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1725 | case elfcpp::R_386_TLS_LDM_CALL: | |
1726 | case elfcpp::R_386_TLS_LDM_POP: | |
1727 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1728 | default: | |
95a2c8d6 RS |
1729 | // Not expected. We will give an error later. |
1730 | return 0; | |
7223e9ca ILT |
1731 | } |
1732 | } | |
1733 | ||
95a2c8d6 RS |
1734 | // Report an unsupported relocation against a local symbol. |
1735 | ||
1736 | void | |
6fa2a40b | 1737 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1738 | unsigned int r_type) |
1739 | { | |
1740 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1741 | object->name().c_str(), r_type); | |
1742 | } | |
1743 | ||
1744 | // Return whether we need to make a PLT entry for a relocation of a | |
1745 | // given type against a STT_GNU_IFUNC symbol. | |
1746 | ||
1747 | bool | |
6fa2a40b CC |
1748 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1749 | Sized_relobj_file<32, false>* object, | |
1750 | unsigned int r_type) | |
95a2c8d6 RS |
1751 | { |
1752 | int flags = Scan::get_reference_flags(r_type); | |
1753 | if (flags & Symbol::TLS_REF) | |
1754 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 1755 | object->name().c_str(), r_type); |
95a2c8d6 RS |
1756 | return flags != 0; |
1757 | } | |
1758 | ||
92e059d8 ILT |
1759 | // Scan a relocation for a local symbol. |
1760 | ||
1761 | inline void | |
ad0f2072 | 1762 | Target_i386::Scan::local(Symbol_table* symtab, |
bfdfa4cd AM |
1763 | Layout* layout, |
1764 | Target_i386* target, | |
1765 | Sized_relobj_file<32, false>* object, | |
1766 | unsigned int data_shndx, | |
1767 | Output_section* output_section, | |
1768 | const elfcpp::Rel<32, false>& reloc, | |
1769 | unsigned int r_type, | |
1770 | const elfcpp::Sym<32, false>& lsym, | |
1771 | bool is_discarded) | |
92e059d8 | 1772 | { |
bfdfa4cd AM |
1773 | if (is_discarded) |
1774 | return; | |
1775 | ||
7223e9ca ILT |
1776 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1777 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1778 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1779 | { | |
1780 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1781 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1782 | } | |
1783 | ||
92e059d8 ILT |
1784 | switch (r_type) |
1785 | { | |
1786 | case elfcpp::R_386_NONE: | |
1787 | case elfcpp::R_386_GNU_VTINHERIT: | |
1788 | case elfcpp::R_386_GNU_VTENTRY: | |
1789 | break; | |
1790 | ||
1791 | case elfcpp::R_386_32: | |
436ca963 ILT |
1792 | // If building a shared library (or a position-independent |
1793 | // executable), we need to create a dynamic relocation for | |
1794 | // this location. The relocation applied at link time will | |
1795 | // apply the link-time value, so we flag the location with | |
1796 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1797 | // relocate it easily. | |
8851ecca | 1798 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1799 | { |
1800 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1801 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1802 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1803 | output_section, data_shndx, | |
1804 | reloc.get_r_offset()); | |
2e702c99 | 1805 | } |
d61c6bd4 ILT |
1806 | break; |
1807 | ||
1808 | case elfcpp::R_386_16: | |
1809 | case elfcpp::R_386_8: | |
1810 | // If building a shared library (or a position-independent | |
1811 | // executable), we need to create a dynamic relocation for | |
1812 | // this location. Because the addend needs to remain in the | |
1813 | // data section, we need to be careful not to apply this | |
1814 | // relocation statically. | |
8851ecca | 1815 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1816 | { |
1817 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1818 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
2e702c99 | 1819 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1820 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1821 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1822 | else |
1823 | { | |
1824 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1825 | unsigned int shndx = lsym.get_st_shndx(); |
1826 | bool is_ordinary; | |
1827 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1828 | &is_ordinary); | |
1829 | if (!is_ordinary) | |
1830 | object->error(_("section symbol %u has bad shndx %u"), | |
1831 | r_sym, shndx); | |
1832 | else | |
1833 | rel_dyn->add_local_section(object, shndx, | |
1834 | r_type, output_section, | |
1835 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1836 | } |
1837 | } | |
92e059d8 ILT |
1838 | break; |
1839 | ||
1840 | case elfcpp::R_386_PC32: | |
1841 | case elfcpp::R_386_PC16: | |
1842 | case elfcpp::R_386_PC8: | |
1843 | break; | |
1844 | ||
df2efe71 ILT |
1845 | case elfcpp::R_386_PLT32: |
1846 | // Since we know this is a local symbol, we can handle this as a | |
1847 | // PC32 reloc. | |
1848 | break; | |
1849 | ||
ead1e424 ILT |
1850 | case elfcpp::R_386_GOTOFF: |
1851 | case elfcpp::R_386_GOTPC: | |
1852 | // We need a GOT section. | |
7e1edb90 | 1853 | target->got_section(symtab, layout); |
ead1e424 ILT |
1854 | break; |
1855 | ||
1b64748b ILT |
1856 | case elfcpp::R_386_GOT32: |
1857 | { | |
c4fc4724 | 1858 | // We need GOT section. |
2e702c99 | 1859 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
1860 | |
1861 | // If the relocation symbol isn't IFUNC, | |
1862 | // and is local, then we will convert | |
1863 | // mov foo@GOT(%reg), %reg | |
1864 | // to | |
1865 | // lea foo@GOTOFF(%reg), %reg | |
1866 | // in Relocate::relocate. | |
1867 | if (reloc.get_r_offset() >= 2 | |
1868 | && lsym.get_st_type() != elfcpp::STT_GNU_IFUNC) | |
1869 | { | |
1870 | section_size_type stype; | |
1871 | const unsigned char* view = object->section_contents(data_shndx, | |
1872 | &stype, true); | |
1873 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
1874 | break; | |
1875 | } | |
1876 | ||
1877 | // Otherwise, the symbol requires a GOT entry. | |
2e702c99 | 1878 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1879 | |
1880 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1881 | // lets function pointers compare correctly with shared | |
1882 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1883 | bool is_new; | |
1884 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1885 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1886 | else | |
1887 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
1888 | if (is_new) |
1889 | { | |
1890 | // If we are generating a shared object, we need to add a | |
1891 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
1892 | if (parameters->options().output_is_position_independent()) | |
1893 | { | |
1894 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1895 | unsigned int got_offset = |
1896 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1897 | rel_dyn->add_local_relative(object, r_sym, | |
1898 | elfcpp::R_386_RELATIVE, | |
1899 | got, got_offset); | |
2e702c99 RM |
1900 | } |
1901 | } | |
1b64748b ILT |
1902 | } |
1903 | break; | |
1904 | ||
af6359d5 ILT |
1905 | // These are relocations which should only be seen by the |
1906 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1907 | case elfcpp::R_386_COPY: |
1908 | case elfcpp::R_386_GLOB_DAT: | |
1909 | case elfcpp::R_386_JUMP_SLOT: | |
1910 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1911 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1912 | case elfcpp::R_386_TLS_TPOFF: |
1913 | case elfcpp::R_386_TLS_DTPMOD32: | |
1914 | case elfcpp::R_386_TLS_DTPOFF32: | |
1915 | case elfcpp::R_386_TLS_TPOFF32: | |
1916 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1917 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1918 | object->name().c_str(), r_type); |
92e059d8 ILT |
1919 | break; |
1920 | ||
af6359d5 | 1921 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1922 | // linking. |
56622147 ILT |
1923 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1924 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1925 | case elfcpp::R_386_TLS_DESC_CALL: | |
1926 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1927 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1928 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1929 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1930 | case elfcpp::R_386_TLS_GOTIE: |
1931 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1932 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1933 | { |
8851ecca | 1934 | bool output_is_shared = parameters->options().shared(); |
af6359d5 | 1935 | const tls::Tls_optimization optimized_type |
2e702c99 | 1936 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); |
7e1edb90 ILT |
1937 | switch (r_type) |
1938 | { | |
56622147 | 1939 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1940 | if (optimized_type == tls::TLSOPT_NONE) |
1941 | { | |
2e702c99 RM |
1942 | // Create a pair of GOT entries for the module index and |
1943 | // dtv-relative offset. | |
1944 | Output_data_got<32, false>* got | |
1945 | = target->got_section(symtab, layout); | |
1946 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1947 | unsigned int shndx = lsym.get_st_shndx(); |
1948 | bool is_ordinary; | |
1949 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1950 | if (!is_ordinary) | |
1951 | object->error(_("local symbol %u has bad shndx %u"), | |
1952 | r_sym, shndx); | |
2e702c99 | 1953 | else |
d491d34e ILT |
1954 | got->add_local_pair_with_rel(object, r_sym, shndx, |
1955 | GOT_TYPE_TLS_PAIR, | |
1956 | target->rel_dyn_section(layout), | |
bd73a62d | 1957 | elfcpp::R_386_TLS_DTPMOD32); |
07f397ab ILT |
1958 | } |
1959 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1960 | unsupported_reloc_local(object, r_type); | |
1961 | break; | |
1962 | ||
56622147 | 1963 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1964 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
1965 | if (optimized_type == tls::TLSOPT_NONE) |
1966 | { | |
1967 | // Create a double GOT entry with an R_386_TLS_DESC | |
1968 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1969 | // lazily, so the GOT entry needs to be in an area in | |
1970 | // .got.plt, not .got. Call got_section to make sure | |
1971 | // the section has been created. | |
a8df5856 | 1972 | target->got_section(symtab, layout); |
2e702c99 RM |
1973 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
1974 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
1975 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1976 | { | |
1977 | unsigned int got_offset = got->add_constant(0); | |
1978 | // The local symbol value is stored in the second | |
1979 | // GOT entry. | |
1980 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1981 | // That set the GOT offset of the local symbol to | |
1982 | // point to the second entry, but we want it to | |
1983 | // point to the first. | |
1984 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1985 | got_offset); | |
1986 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1987 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1988 | } | |
2e702c99 RM |
1989 | } |
1990 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1991 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1992 | break; |
1993 | ||
c2b45e22 CC |
1994 | case elfcpp::R_386_TLS_DESC_CALL: |
1995 | break; | |
1996 | ||
56622147 | 1997 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1998 | if (optimized_type == tls::TLSOPT_NONE) |
1999 | { | |
2e702c99 RM |
2000 | // Create a GOT entry for the module index. |
2001 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2002 | } |
2003 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2004 | unsupported_reloc_local(object, r_type); |
2005 | break; | |
2006 | ||
56622147 | 2007 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2008 | break; |
2009 | ||
56622147 ILT |
2010 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2011 | case elfcpp::R_386_TLS_IE_32: | |
2012 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2013 | layout->set_has_static_tls(); |
07f397ab ILT |
2014 | if (optimized_type == tls::TLSOPT_NONE) |
2015 | { | |
2e702c99 RM |
2016 | // For the R_386_TLS_IE relocation, we need to create a |
2017 | // dynamic relocation when building a shared library. | |
2018 | if (r_type == elfcpp::R_386_TLS_IE | |
2019 | && parameters->options().shared()) | |
2020 | { | |
2021 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2022 | unsigned int r_sym | |
2023 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2024 | rel_dyn->add_local_relative(object, r_sym, | |
2025 | elfcpp::R_386_RELATIVE, | |
2026 | output_section, data_shndx, | |
2027 | reloc.get_r_offset()); | |
2028 | } | |
2029 | // Create a GOT entry for the tp-relative offset. | |
2030 | Output_data_got<32, false>* got | |
2031 | = target->got_section(symtab, layout); | |
2032 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2033 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2034 | ? elfcpp::R_386_TLS_TPOFF32 | |
2035 | : elfcpp::R_386_TLS_TPOFF); | |
2036 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2037 | ? GOT_TYPE_TLS_OFFSET | |
2038 | : GOT_TYPE_TLS_NOFFSET); | |
2039 | got->add_local_with_rel(object, r_sym, got_type, | |
2040 | target->rel_dyn_section(layout), | |
2041 | dyn_r_type); | |
07f397ab ILT |
2042 | } |
2043 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2044 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 2045 | break; |
af6359d5 | 2046 | |
56622147 ILT |
2047 | case elfcpp::R_386_TLS_LE: // Local-exec |
2048 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2049 | layout->set_has_static_tls(); |
07f397ab | 2050 | if (output_is_shared) |
7bf1f802 | 2051 | { |
2e702c99 RM |
2052 | // We need to create a dynamic relocation. |
2053 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2054 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2055 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2056 | ? elfcpp::R_386_TLS_TPOFF32 | |
2057 | : elfcpp::R_386_TLS_TPOFF); | |
2058 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2059 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
2060 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2061 | } |
56622147 ILT |
2062 | break; |
2063 | ||
af6359d5 ILT |
2064 | default: |
2065 | gold_unreachable(); | |
7e1edb90 ILT |
2066 | } |
2067 | } | |
92e059d8 ILT |
2068 | break; |
2069 | ||
92e059d8 ILT |
2070 | case elfcpp::R_386_32PLT: |
2071 | case elfcpp::R_386_TLS_GD_32: | |
2072 | case elfcpp::R_386_TLS_GD_PUSH: | |
2073 | case elfcpp::R_386_TLS_GD_CALL: | |
2074 | case elfcpp::R_386_TLS_GD_POP: | |
2075 | case elfcpp::R_386_TLS_LDM_32: | |
2076 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2077 | case elfcpp::R_386_TLS_LDM_CALL: | |
2078 | case elfcpp::R_386_TLS_LDM_POP: | |
2079 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2080 | default: | |
af6359d5 | 2081 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
2082 | break; |
2083 | } | |
2084 | } | |
2085 | ||
af6359d5 ILT |
2086 | // Report an unsupported relocation against a global symbol. |
2087 | ||
2088 | void | |
6fa2a40b CC |
2089 | Target_i386::Scan::unsupported_reloc_global( |
2090 | Sized_relobj_file<32, false>* object, | |
2091 | unsigned int r_type, | |
2092 | Symbol* gsym) | |
af6359d5 | 2093 | { |
75f2446e | 2094 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2095 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
2096 | } |
2097 | ||
0897ed3b ST |
2098 | inline bool |
2099 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
2100 | { | |
2101 | switch (r_type) | |
2102 | { | |
2103 | case elfcpp::R_386_32: | |
2104 | case elfcpp::R_386_16: | |
2105 | case elfcpp::R_386_8: | |
2106 | case elfcpp::R_386_GOTOFF: | |
2107 | case elfcpp::R_386_GOT32: | |
2108 | { | |
2e702c99 | 2109 | return true; |
0897ed3b ST |
2110 | } |
2111 | default: | |
2112 | return false; | |
2113 | } | |
2114 | return false; | |
2115 | } | |
2116 | ||
2117 | inline bool | |
2118 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
2119 | Symbol_table* , | |
2120 | Layout* , | |
2121 | Target_i386* , | |
6fa2a40b | 2122 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2123 | unsigned int , |
2124 | Output_section* , | |
2125 | const elfcpp::Rel<32, false>& , | |
2126 | unsigned int r_type, | |
2127 | const elfcpp::Sym<32, false>&) | |
2128 | { | |
2129 | return possible_function_pointer_reloc(r_type); | |
2130 | } | |
2131 | ||
2132 | inline bool | |
2133 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
2134 | Symbol_table* , | |
2135 | Layout* , | |
2136 | Target_i386* , | |
6fa2a40b | 2137 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2138 | unsigned int , |
2139 | Output_section* , | |
2140 | const elfcpp::Rel<32, false>& , | |
2141 | unsigned int r_type, | |
2142 | Symbol*) | |
2143 | { | |
2144 | return possible_function_pointer_reloc(r_type); | |
2145 | } | |
2146 | ||
92e059d8 ILT |
2147 | // Scan a relocation for a global symbol. |
2148 | ||
2149 | inline void | |
ad0f2072 | 2150 | Target_i386::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2151 | Layout* layout, |
2152 | Target_i386* target, | |
2153 | Sized_relobj_file<32, false>* object, | |
2154 | unsigned int data_shndx, | |
2155 | Output_section* output_section, | |
2156 | const elfcpp::Rel<32, false>& reloc, | |
2157 | unsigned int r_type, | |
2158 | Symbol* gsym) | |
92e059d8 | 2159 | { |
7223e9ca ILT |
2160 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2161 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2162 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2163 | target->make_plt_entry(symtab, layout, gsym); | |
2164 | ||
92e059d8 ILT |
2165 | switch (r_type) |
2166 | { | |
2167 | case elfcpp::R_386_NONE: | |
2168 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 2169 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
2170 | break; |
2171 | ||
2172 | case elfcpp::R_386_32: | |
92e059d8 | 2173 | case elfcpp::R_386_16: |
92e059d8 | 2174 | case elfcpp::R_386_8: |
96f2030e | 2175 | { |
2e702c99 RM |
2176 | // Make a PLT entry if necessary. |
2177 | if (gsym->needs_plt_entry()) | |
2178 | { | |
2179 | target->make_plt_entry(symtab, layout, gsym); | |
2180 | // Since this is not a PC-relative relocation, we may be | |
2181 | // taking the address of a function. In that case we need to | |
2182 | // set the entry in the dynamic symbol table to the address of | |
2183 | // the PLT entry. | |
2184 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2185 | gsym->set_needs_dynsym_value(); | |
2186 | } | |
2187 | // Make a dynamic relocation if necessary. | |
2188 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2189 | { | |
a82bef93 ST |
2190 | if (!parameters->options().output_is_position_independent() |
2191 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2192 | { |
2193 | target->copy_reloc(symtab, layout, object, | |
2194 | data_shndx, output_section, gsym, reloc); | |
2195 | } | |
7223e9ca ILT |
2196 | else if (r_type == elfcpp::R_386_32 |
2197 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2198 | && gsym->can_use_relative_reloc(false) | |
2199 | && !gsym->is_from_dynobj() | |
2200 | && !gsym->is_undefined() | |
2201 | && !gsym->is_preemptible()) | |
2202 | { | |
2203 | // Use an IRELATIVE reloc for a locally defined | |
2204 | // STT_GNU_IFUNC symbol. This makes a function | |
2205 | // address in a PIE executable match the address in a | |
2206 | // shared library that it links against. | |
67181c72 | 2207 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
2208 | rel_dyn->add_symbolless_global_addend(gsym, |
2209 | elfcpp::R_386_IRELATIVE, | |
2210 | output_section, | |
2211 | object, data_shndx, | |
2212 | reloc.get_r_offset()); | |
2213 | } | |
2e702c99 RM |
2214 | else if (r_type == elfcpp::R_386_32 |
2215 | && gsym->can_use_relative_reloc(false)) | |
2216 | { | |
2217 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
2218 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2219 | output_section, object, | |
2220 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
2221 | } |
2222 | else | |
2223 | { | |
2224 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2225 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2226 | data_shndx, reloc.get_r_offset()); | |
2227 | } | |
2228 | } | |
d61c6bd4 ILT |
2229 | } |
2230 | break; | |
2231 | ||
2232 | case elfcpp::R_386_PC32: | |
2233 | case elfcpp::R_386_PC16: | |
2234 | case elfcpp::R_386_PC8: | |
2235 | { | |
2e702c99 RM |
2236 | // Make a PLT entry if necessary. |
2237 | if (gsym->needs_plt_entry()) | |
2238 | { | |
2239 | // These relocations are used for function calls only in | |
2240 | // non-PIC code. For a 32-bit relocation in a shared library, | |
2241 | // we'll need a text relocation anyway, so we can skip the | |
2242 | // PLT entry and let the dynamic linker bind the call directly | |
2243 | // to the target. For smaller relocations, we should use a | |
2244 | // PLT entry to ensure that the call can reach. | |
2245 | if (!parameters->options().shared() | |
2246 | || r_type != elfcpp::R_386_PC32) | |
2247 | target->make_plt_entry(symtab, layout, gsym); | |
2248 | } | |
2249 | // Make a dynamic relocation if necessary. | |
2250 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2251 | { | |
a82bef93 ST |
2252 | if (parameters->options().output_is_executable() |
2253 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2254 | { |
2255 | target->copy_reloc(symtab, layout, object, | |
2256 | data_shndx, output_section, gsym, reloc); | |
2257 | } | |
2258 | else | |
2259 | { | |
2260 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2261 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2262 | data_shndx, reloc.get_r_offset()); | |
2263 | } | |
2264 | } | |
96f2030e | 2265 | } |
92e059d8 ILT |
2266 | break; |
2267 | ||
ead1e424 | 2268 | case elfcpp::R_386_GOT32: |
8462ae85 | 2269 | { |
c4fc4724 | 2270 | // The symbol requires a GOT section. |
2e702c99 | 2271 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
2272 | |
2273 | // If we convert this from | |
2274 | // mov foo@GOT(%reg), %reg | |
2275 | // to | |
2276 | // lea foo@GOTOFF(%reg), %reg | |
2277 | // in Relocate::relocate, then there is nothing to do here. | |
2278 | if (reloc.get_r_offset() >= 2 | |
2279 | && Target_i386::can_convert_mov_to_lea(gsym)) | |
2280 | { | |
2281 | section_size_type stype; | |
2282 | const unsigned char* view = object->section_contents(data_shndx, | |
2283 | &stype, true); | |
2284 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
2285 | break; | |
2286 | } | |
2287 | ||
2e702c99 | 2288 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2289 | { |
2290 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2291 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2292 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2293 | else | |
2294 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2295 | } | |
2e702c99 RM |
2296 | else |
2297 | { | |
2298 | // If this symbol is not fully resolved, we need to add a | |
2299 | // GOT entry with a dynamic relocation. | |
2300 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2301 | |
2302 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2303 | // | |
2304 | // 1) The symbol may be defined in some other module. | |
2305 | // | |
2306 | // 2) We are building a shared library and this is a | |
2307 | // protected symbol; using GLOB_DAT means that the dynamic | |
2308 | // linker can use the address of the PLT in the main | |
2309 | // executable when appropriate so that function address | |
2310 | // comparisons work. | |
2311 | // | |
2312 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2313 | // code, again so that function address comparisons work. | |
2e702c99 RM |
2314 | if (gsym->is_from_dynobj() |
2315 | || gsym->is_undefined() | |
2316 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2317 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2318 | && parameters->options().shared()) | |
7223e9ca ILT |
2319 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2320 | && parameters->options().output_is_position_independent())) | |
2e702c99 RM |
2321 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2322 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
2323 | else | |
2324 | { | |
7223e9ca ILT |
2325 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2326 | // offset into the GOT, so that function pointer | |
2327 | // comparisons work correctly. | |
2328 | bool is_new; | |
2329 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2330 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2331 | else | |
2332 | { | |
2333 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2334 | // Tell the dynamic linker to use the PLT address | |
2335 | // when resolving relocations. | |
2336 | if (gsym->is_from_dynobj() | |
2337 | && !parameters->options().shared()) | |
2338 | gsym->set_needs_dynsym_value(); | |
2339 | } | |
2e702c99 | 2340 | if (is_new) |
7223e9ca ILT |
2341 | { |
2342 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2343 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2344 | got, got_off); | |
2345 | } | |
2e702c99 RM |
2346 | } |
2347 | } | |
8462ae85 | 2348 | } |
ead1e424 ILT |
2349 | break; |
2350 | ||
2351 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2352 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2353 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2354 | if (gsym->final_value_is_known()) |
ead1e424 | 2355 | break; |
436ca963 ILT |
2356 | // If building a shared library, we can also skip the PLT entry |
2357 | // if the symbol is defined in the output file and is protected | |
2358 | // or hidden. | |
2359 | if (gsym->is_defined() | |
2e702c99 RM |
2360 | && !gsym->is_from_dynobj() |
2361 | && !gsym->is_preemptible()) | |
436ca963 | 2362 | break; |
7e1edb90 | 2363 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2364 | break; |
2365 | ||
2366 | case elfcpp::R_386_GOTOFF: | |
2367 | case elfcpp::R_386_GOTPC: | |
2368 | // We need a GOT section. | |
7e1edb90 | 2369 | target->got_section(symtab, layout); |
ead1e424 ILT |
2370 | break; |
2371 | ||
af6359d5 ILT |
2372 | // These are relocations which should only be seen by the |
2373 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2374 | case elfcpp::R_386_COPY: |
2375 | case elfcpp::R_386_GLOB_DAT: | |
2376 | case elfcpp::R_386_JUMP_SLOT: | |
2377 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2378 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2379 | case elfcpp::R_386_TLS_TPOFF: |
2380 | case elfcpp::R_386_TLS_DTPMOD32: | |
2381 | case elfcpp::R_386_TLS_DTPOFF32: | |
2382 | case elfcpp::R_386_TLS_TPOFF32: | |
2383 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2384 | gold_error(_("%s: unexpected reloc %u in object file"), |
2385 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2386 | break; |
2387 | ||
d61c17ea ILT |
2388 | // These are initial tls relocs, which are expected when |
2389 | // linking. | |
56622147 ILT |
2390 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2391 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2392 | case elfcpp::R_386_TLS_DESC_CALL: | |
2393 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2394 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2395 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2396 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2397 | case elfcpp::R_386_TLS_GOTIE: |
2398 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2399 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2400 | { |
7e1edb90 | 2401 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 | 2402 | const tls::Tls_optimization optimized_type |
2e702c99 | 2403 | = Target_i386::optimize_tls_reloc(is_final, r_type); |
a3ad94ed ILT |
2404 | switch (r_type) |
2405 | { | |
56622147 | 2406 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2407 | if (optimized_type == tls::TLSOPT_NONE) |
2408 | { | |
2e702c99 RM |
2409 | // Create a pair of GOT entries for the module index and |
2410 | // dtv-relative offset. | |
2411 | Output_data_got<32, false>* got | |
2412 | = target->got_section(symtab, layout); | |
2413 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
2414 | target->rel_dyn_section(layout), | |
2415 | elfcpp::R_386_TLS_DTPMOD32, | |
2416 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2417 | } |
2418 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2419 | { | |
2e702c99 RM |
2420 | // Create a GOT entry for the tp-relative offset. |
2421 | Output_data_got<32, false>* got | |
2422 | = target->got_section(symtab, layout); | |
2423 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2424 | target->rel_dyn_section(layout), | |
2425 | elfcpp::R_386_TLS_TPOFF); | |
07f397ab ILT |
2426 | } |
2427 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2428 | unsupported_reloc_global(object, r_type, gsym); | |
2429 | break; | |
2430 | ||
56622147 | 2431 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2432 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
2433 | if (optimized_type == tls::TLSOPT_NONE) |
2434 | { | |
2435 | // Create a double GOT entry with an R_386_TLS_DESC | |
2436 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2437 | // lazily, so the GOT entry needs to be in an area in | |
2438 | // .got.plt, not .got. Call got_section to make sure | |
2439 | // the section has been created. | |
a8df5856 | 2440 | target->got_section(symtab, layout); |
2e702c99 | 2441 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
e291e7b9 | 2442 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2e702c99 RM |
2443 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2444 | elfcpp::R_386_TLS_DESC, 0); | |
2445 | } | |
2446 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2447 | { | |
2448 | // Create a GOT entry for the tp-relative offset. | |
2449 | Output_data_got<32, false>* got | |
2450 | = target->got_section(symtab, layout); | |
2451 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2452 | target->rel_dyn_section(layout), | |
2453 | elfcpp::R_386_TLS_TPOFF); | |
2454 | } | |
2455 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2456 | unsupported_reloc_global(object, r_type, gsym); | |
c2b45e22 CC |
2457 | break; |
2458 | ||
2459 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2460 | break; |
2461 | ||
56622147 | 2462 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2463 | if (optimized_type == tls::TLSOPT_NONE) |
2464 | { | |
2e702c99 RM |
2465 | // Create a GOT entry for the module index. |
2466 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2467 | } |
2468 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2469 | unsupported_reloc_global(object, r_type, gsym); |
2470 | break; | |
2471 | ||
56622147 | 2472 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2473 | break; |
2474 | ||
56622147 ILT |
2475 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2476 | case elfcpp::R_386_TLS_IE_32: | |
2477 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2478 | layout->set_has_static_tls(); |
07f397ab ILT |
2479 | if (optimized_type == tls::TLSOPT_NONE) |
2480 | { | |
2e702c99 RM |
2481 | // For the R_386_TLS_IE relocation, we need to create a |
2482 | // dynamic relocation when building a shared library. | |
2483 | if (r_type == elfcpp::R_386_TLS_IE | |
2484 | && parameters->options().shared()) | |
2485 | { | |
2486 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2487 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2488 | output_section, object, | |
2489 | data_shndx, | |
2490 | reloc.get_r_offset()); | |
2491 | } | |
2492 | // Create a GOT entry for the tp-relative offset. | |
2493 | Output_data_got<32, false>* got | |
2494 | = target->got_section(symtab, layout); | |
2495 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2496 | ? elfcpp::R_386_TLS_TPOFF32 | |
2497 | : elfcpp::R_386_TLS_TPOFF); | |
2498 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2499 | ? GOT_TYPE_TLS_OFFSET | |
2500 | : GOT_TYPE_TLS_NOFFSET); | |
2501 | got->add_global_with_rel(gsym, got_type, | |
2502 | target->rel_dyn_section(layout), | |
2503 | dyn_r_type); | |
07f397ab ILT |
2504 | } |
2505 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2506 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2507 | break; |
af6359d5 | 2508 | |
56622147 ILT |
2509 | case elfcpp::R_386_TLS_LE: // Local-exec |
2510 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2511 | layout->set_has_static_tls(); |
8851ecca | 2512 | if (parameters->options().shared()) |
7bf1f802 | 2513 | { |
2e702c99 RM |
2514 | // We need to create a dynamic relocation. |
2515 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2516 | ? elfcpp::R_386_TLS_TPOFF32 | |
2517 | : elfcpp::R_386_TLS_TPOFF); | |
2518 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2519 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2520 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2521 | } |
56622147 ILT |
2522 | break; |
2523 | ||
af6359d5 ILT |
2524 | default: |
2525 | gold_unreachable(); | |
a3ad94ed ILT |
2526 | } |
2527 | } | |
92e059d8 ILT |
2528 | break; |
2529 | ||
92e059d8 ILT |
2530 | case elfcpp::R_386_32PLT: |
2531 | case elfcpp::R_386_TLS_GD_32: | |
2532 | case elfcpp::R_386_TLS_GD_PUSH: | |
2533 | case elfcpp::R_386_TLS_GD_CALL: | |
2534 | case elfcpp::R_386_TLS_GD_POP: | |
2535 | case elfcpp::R_386_TLS_LDM_32: | |
2536 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2537 | case elfcpp::R_386_TLS_LDM_CALL: | |
2538 | case elfcpp::R_386_TLS_LDM_POP: | |
2539 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2540 | default: | |
af6359d5 | 2541 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2542 | break; |
2543 | } | |
2544 | } | |
2545 | ||
6d03d481 ST |
2546 | // Process relocations for gc. |
2547 | ||
2548 | void | |
ad0f2072 | 2549 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
2550 | Layout* layout, |
2551 | Sized_relobj_file<32, false>* object, | |
2552 | unsigned int data_shndx, | |
2553 | unsigned int, | |
2554 | const unsigned char* prelocs, | |
2555 | size_t reloc_count, | |
2556 | Output_section* output_section, | |
2557 | bool needs_special_offset_handling, | |
2558 | size_t local_symbol_count, | |
2559 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
2560 | { |
2561 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
2e702c99 RM |
2562 | Target_i386::Scan, |
2563 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2564 | symtab, |
2565 | layout, | |
2566 | this, | |
2567 | object, | |
2568 | data_shndx, | |
2569 | prelocs, | |
2570 | reloc_count, | |
2571 | output_section, | |
2572 | needs_special_offset_handling, | |
2573 | local_symbol_count, | |
2574 | plocal_symbols); | |
2575 | } | |
2576 | ||
92e059d8 ILT |
2577 | // Scan relocations for a section. |
2578 | ||
2579 | void | |
ad0f2072 | 2580 | Target_i386::scan_relocs(Symbol_table* symtab, |
2e702c99 RM |
2581 | Layout* layout, |
2582 | Sized_relobj_file<32, false>* object, | |
2583 | unsigned int data_shndx, | |
2584 | unsigned int sh_type, | |
2585 | const unsigned char* prelocs, | |
2586 | size_t reloc_count, | |
2587 | Output_section* output_section, | |
2588 | bool needs_special_offset_handling, | |
2589 | size_t local_symbol_count, | |
2590 | const unsigned char* plocal_symbols) | |
92e059d8 ILT |
2591 | { |
2592 | if (sh_type == elfcpp::SHT_RELA) | |
2593 | { | |
75f2446e ILT |
2594 | gold_error(_("%s: unsupported RELA reloc section"), |
2595 | object->name().c_str()); | |
2596 | return; | |
92e059d8 ILT |
2597 | } |
2598 | ||
ead1e424 ILT |
2599 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2600 | Target_i386::Scan>( | |
92e059d8 | 2601 | symtab, |
ead1e424 ILT |
2602 | layout, |
2603 | this, | |
92e059d8 | 2604 | object, |
a3ad94ed | 2605 | data_shndx, |
92e059d8 ILT |
2606 | prelocs, |
2607 | reloc_count, | |
730cdc88 ILT |
2608 | output_section, |
2609 | needs_special_offset_handling, | |
92e059d8 | 2610 | local_symbol_count, |
730cdc88 | 2611 | plocal_symbols); |
92e059d8 ILT |
2612 | } |
2613 | ||
16649710 | 2614 | // Finalize the sections. |
5a6f7e2d ILT |
2615 | |
2616 | void | |
f59f41f3 DK |
2617 | Target_i386::do_finalize_sections( |
2618 | Layout* layout, | |
2619 | const Input_objects*, | |
e785ec03 | 2620 | Symbol_table* symtab) |
5a6f7e2d | 2621 | { |
ea715a34 ILT |
2622 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2623 | ? NULL | |
2624 | : this->plt_->rel_plt()); | |
2625 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2626 | this->rel_dyn_, true, false); |
16649710 ILT |
2627 | |
2628 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2629 | // relocs. | |
12c0daef ILT |
2630 | if (this->copy_relocs_.any_saved_relocs()) |
2631 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2632 | |
2633 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2634 | // the .got.plt section. | |
2635 | Symbol* sym = this->global_offset_table_; | |
2636 | if (sym != NULL) | |
2637 | { | |
2638 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2639 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2640 | } | |
28a13fec | 2641 | |
67181c72 ILT |
2642 | if (parameters->doing_static_link() |
2643 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2644 | { |
2645 | // If linking statically, make sure that the __rel_iplt symbols | |
2646 | // were defined if necessary, even if we didn't create a PLT. | |
2647 | static const Define_symbol_in_segment syms[] = | |
2648 | { | |
2649 | { | |
2650 | "__rel_iplt_start", // name | |
2651 | elfcpp::PT_LOAD, // segment_type | |
2652 | elfcpp::PF_W, // segment_flags_set | |
2653 | elfcpp::PF(0), // segment_flags_clear | |
2654 | 0, // value | |
2655 | 0, // size | |
2656 | elfcpp::STT_NOTYPE, // type | |
2657 | elfcpp::STB_GLOBAL, // binding | |
2658 | elfcpp::STV_HIDDEN, // visibility | |
2659 | 0, // nonvis | |
2660 | Symbol::SEGMENT_START, // offset_from_base | |
2661 | true // only_if_ref | |
2662 | }, | |
2663 | { | |
2664 | "__rel_iplt_end", // name | |
2665 | elfcpp::PT_LOAD, // segment_type | |
2666 | elfcpp::PF_W, // segment_flags_set | |
2667 | elfcpp::PF(0), // segment_flags_clear | |
2668 | 0, // value | |
2669 | 0, // size | |
2670 | elfcpp::STT_NOTYPE, // type | |
2671 | elfcpp::STB_GLOBAL, // binding | |
2672 | elfcpp::STV_HIDDEN, // visibility | |
2673 | 0, // nonvis | |
2674 | Symbol::SEGMENT_START, // offset_from_base | |
2675 | true // only_if_ref | |
2676 | } | |
2677 | }; | |
2678 | ||
2679 | symtab->define_symbols(layout, 2, syms, | |
2680 | layout->script_options()->saw_sections_clause()); | |
2681 | } | |
5a6f7e2d ILT |
2682 | } |
2683 | ||
86849f1f ILT |
2684 | // Return whether a direct absolute static relocation needs to be applied. |
2685 | // In cases where Scan::local() or Scan::global() has created | |
2686 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2687 | // of the relocation is carried in the data, and we must not | |
2688 | // apply the static relocation. | |
2689 | ||
2690 | inline bool | |
2691 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
2692 | unsigned int r_type, |
2693 | bool is_32bit, | |
031cdbed | 2694 | Output_section* output_section) |
86849f1f | 2695 | { |
031cdbed ILT |
2696 | // If the output section is not allocated, then we didn't call |
2697 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2698 | // the reloc here. | |
2699 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2700 | return true; | |
2701 | ||
95a2c8d6 RS |
2702 | int ref_flags = Scan::get_reference_flags(r_type); |
2703 | ||
d61c6bd4 ILT |
2704 | // For local symbols, we will have created a non-RELATIVE dynamic |
2705 | // relocation only if (a) the output is position independent, | |
2706 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2707 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2708 | if (gsym == NULL) |
8851ecca | 2709 | return !(parameters->options().output_is_position_independent() |
2e702c99 RM |
2710 | && (ref_flags & Symbol::ABSOLUTE_REF) |
2711 | && !is_32bit); | |
86849f1f | 2712 | |
0700cf32 ILT |
2713 | // For global symbols, we use the same helper routines used in the |
2714 | // scan pass. If we did not create a dynamic relocation, or if we | |
2715 | // created a RELATIVE dynamic relocation, we should apply the static | |
2716 | // relocation. | |
2717 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2718 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2e702c99 RM |
2719 | && gsym->can_use_relative_reloc(ref_flags |
2720 | & Symbol::FUNCTION_CALL); | |
0700cf32 | 2721 | return !has_dyn || is_rel; |
86849f1f ILT |
2722 | } |
2723 | ||
61ba1cf9 ILT |
2724 | // Perform a relocation. |
2725 | ||
ead1e424 | 2726 | inline bool |
92e059d8 | 2727 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
2e702c99 RM |
2728 | Target_i386* target, |
2729 | Output_section* output_section, | |
2730 | size_t relnum, | |
2731 | const elfcpp::Rel<32, false>& rel, | |
2732 | unsigned int r_type, | |
2733 | const Sized_symbol<32>* gsym, | |
2734 | const Symbol_value<32>* psymval, | |
2735 | unsigned char* view, | |
2736 | elfcpp::Elf_types<32>::Elf_Addr address, | |
2737 | section_size_type view_size) | |
61ba1cf9 | 2738 | { |
ead1e424 ILT |
2739 | if (this->skip_call_tls_get_addr_) |
2740 | { | |
5efc7cd2 | 2741 | if ((r_type != elfcpp::R_386_PLT32 |
2e702c99 | 2742 | && r_type != elfcpp::R_386_PC32) |
ead1e424 ILT |
2743 | || gsym == NULL |
2744 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2745 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2746 | _("missing expected TLS relocation")); | |
2747 | else | |
ead1e424 | 2748 | { |
75f2446e ILT |
2749 | this->skip_call_tls_get_addr_ = false; |
2750 | return false; | |
ead1e424 | 2751 | } |
ead1e424 ILT |
2752 | } |
2753 | ||
0e804863 ILT |
2754 | if (view == NULL) |
2755 | return true; | |
2756 | ||
6fa2a40b | 2757 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2758 | |
a3ad94ed | 2759 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2760 | Symbol_value<32> symval; |
436ca963 | 2761 | if (gsym != NULL |
7223e9ca ILT |
2762 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2763 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2764 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2765 | && gsym->can_use_relative_reloc(false) |
2766 | && !gsym->is_from_dynobj() | |
2767 | && !gsym->is_undefined() | |
2768 | && !gsym->is_preemptible()) | |
2769 | { | |
2770 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2771 | // want to use the real value of the symbol, not the PLT offset. | |
2772 | } | |
2773 | else if (gsym != NULL | |
95a2c8d6 | 2774 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2775 | { |
19fec8c1 | 2776 | symval.set_output_value(target->plt_address_for_global(gsym)); |
b8e6aad9 | 2777 | psymval = &symval; |
a3ad94ed | 2778 | } |
7223e9ca ILT |
2779 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2780 | { | |
2781 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2782 | if (object->local_has_plt_offset(r_sym)) | |
2783 | { | |
19fec8c1 | 2784 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
2785 | psymval = &symval; |
2786 | } | |
2787 | } | |
b8e6aad9 | 2788 | |
61ba1cf9 ILT |
2789 | switch (r_type) |
2790 | { | |
2791 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2792 | case elfcpp::R_386_GNU_VTINHERIT: |
2793 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2794 | break; |
2795 | ||
2796 | case elfcpp::R_386_32: | |
95a2c8d6 | 2797 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2798 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2799 | break; |
2800 | ||
2801 | case elfcpp::R_386_PC32: | |
95a2c8d6 | 2802 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2803 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
92e059d8 ILT |
2804 | break; |
2805 | ||
2806 | case elfcpp::R_386_16: | |
95a2c8d6 | 2807 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2808 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2809 | break; |
2810 | ||
2811 | case elfcpp::R_386_PC16: | |
95a2c8d6 | 2812 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2813 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
61ba1cf9 ILT |
2814 | break; |
2815 | ||
92e059d8 | 2816 | case elfcpp::R_386_8: |
95a2c8d6 | 2817 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2818 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2819 | break; |
2820 | ||
2821 | case elfcpp::R_386_PC8: | |
95a2c8d6 | 2822 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2823 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
92e059d8 ILT |
2824 | break; |
2825 | ||
ead1e424 | 2826 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2827 | gold_assert(gsym == NULL |
2828 | || gsym->has_plt_offset() | |
99f8faca ILT |
2829 | || gsym->final_value_is_known() |
2830 | || (gsym->is_defined() | |
2831 | && !gsym->is_from_dynobj() | |
2832 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2833 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2834 | break; |
2835 | ||
2836 | case elfcpp::R_386_GOT32: | |
c4fc4724 IT |
2837 | // Convert |
2838 | // mov foo@GOT(%reg), %reg | |
2839 | // to | |
2840 | // lea foo@GOTOFF(%reg), %reg | |
2841 | // if possible. | |
2842 | if (rel.get_r_offset() >= 2 | |
2843 | && view[-2] == 0x8b | |
2844 | && ((gsym == NULL && !psymval->is_ifunc_symbol()) | |
2845 | || (gsym != NULL | |
2846 | && Target_i386::can_convert_mov_to_lea(gsym)))) | |
2847 | { | |
2848 | view[-2] = 0x8d; | |
2849 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2850 | value = (psymval->value(object, 0) | |
2851 | - target->got_plt_section()->address()); | |
2852 | Relocate_functions<32, false>::rel32(view, value); | |
2853 | } | |
2854 | else | |
2855 | { | |
2856 | // The GOT pointer points to the end of the GOT section. | |
2857 | // We need to subtract the size of the GOT section to get | |
2858 | // the actual offset to use in the relocation. | |
2859 | unsigned int got_offset = 0; | |
2860 | if (gsym != NULL) | |
2861 | { | |
2862 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
2863 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2864 | - target->got_size()); | |
2865 | } | |
2866 | else | |
2867 | { | |
2868 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2869 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2870 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2871 | - target->got_size()); | |
2872 | } | |
2873 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2874 | } | |
ead1e424 ILT |
2875 | break; |
2876 | ||
2877 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2878 | { |
2879 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2880 | value = (psymval->value(object, 0) | |
96f2030e | 2881 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2882 | Relocate_functions<32, false>::rel32(view, value); |
2883 | } | |
ead1e424 ILT |
2884 | break; |
2885 | ||
2886 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2887 | { |
2888 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2889 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2890 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2891 | } | |
ead1e424 ILT |
2892 | break; |
2893 | ||
92e059d8 ILT |
2894 | case elfcpp::R_386_COPY: |
2895 | case elfcpp::R_386_GLOB_DAT: | |
2896 | case elfcpp::R_386_JUMP_SLOT: | |
2897 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2898 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2899 | // These are outstanding tls relocs, which are unexpected when |
2900 | // linking. | |
92e059d8 ILT |
2901 | case elfcpp::R_386_TLS_TPOFF: |
2902 | case elfcpp::R_386_TLS_DTPMOD32: | |
2903 | case elfcpp::R_386_TLS_DTPOFF32: | |
2904 | case elfcpp::R_386_TLS_TPOFF32: | |
2905 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2906 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2907 | _("unexpected reloc %u in object file"), | |
2908 | r_type); | |
92e059d8 ILT |
2909 | break; |
2910 | ||
d61c17ea ILT |
2911 | // These are initial tls relocs, which are expected when |
2912 | // linking. | |
56622147 ILT |
2913 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2914 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2915 | case elfcpp::R_386_TLS_DESC_CALL: | |
2916 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2917 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2918 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2919 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2920 | case elfcpp::R_386_TLS_GOTIE: |
2921 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2922 | case elfcpp::R_386_TLS_LE_32: |
07f397ab | 2923 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2e702c99 | 2924 | view, address, view_size); |
92e059d8 ILT |
2925 | break; |
2926 | ||
92e059d8 ILT |
2927 | case elfcpp::R_386_32PLT: |
2928 | case elfcpp::R_386_TLS_GD_32: | |
2929 | case elfcpp::R_386_TLS_GD_PUSH: | |
2930 | case elfcpp::R_386_TLS_GD_CALL: | |
2931 | case elfcpp::R_386_TLS_GD_POP: | |
2932 | case elfcpp::R_386_TLS_LDM_32: | |
2933 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2934 | case elfcpp::R_386_TLS_LDM_CALL: | |
2935 | case elfcpp::R_386_TLS_LDM_POP: | |
2936 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2937 | default: |
75f2446e ILT |
2938 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2939 | _("unsupported reloc %u"), | |
2940 | r_type); | |
92e059d8 ILT |
2941 | break; |
2942 | } | |
ead1e424 ILT |
2943 | |
2944 | return true; | |
92e059d8 ILT |
2945 | } |
2946 | ||
2947 | // Perform a TLS relocation. | |
2948 | ||
2949 | inline void | |
2950 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
2e702c99 | 2951 | Target_i386* target, |
92e059d8 ILT |
2952 | size_t relnum, |
2953 | const elfcpp::Rel<32, false>& rel, | |
2954 | unsigned int r_type, | |
c06b7b0b | 2955 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2956 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2957 | unsigned char* view, |
2958 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2959 | section_size_type view_size) |
92e059d8 ILT |
2960 | { |
2961 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2962 | |
6fa2a40b | 2963 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2964 | |
2965 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2966 | |
b3705d2a ILT |
2967 | const bool is_final = (gsym == NULL |
2968 | ? !parameters->options().shared() | |
2969 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2970 | const tls::Tls_optimization optimized_type |
2971 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2972 | switch (r_type) |
2973 | { | |
56622147 | 2974 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2975 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2976 | { |
62855347 ILT |
2977 | if (tls_segment == NULL) |
2978 | { | |
191f1a2d ILT |
2979 | gold_assert(parameters->errors()->error_count() > 0 |
2980 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2981 | return; |
2982 | } | |
56622147 ILT |
2983 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2984 | rel, r_type, value, view, | |
2985 | view_size); | |
92e059d8 ILT |
2986 | break; |
2987 | } | |
07f397ab | 2988 | else |
2e702c99 RM |
2989 | { |
2990 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2991 | ? GOT_TYPE_TLS_NOFFSET | |
2992 | : GOT_TYPE_TLS_PAIR); | |
2993 | unsigned int got_offset; | |
2994 | if (gsym != NULL) | |
2995 | { | |
2996 | gold_assert(gsym->has_got_offset(got_type)); | |
2997 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2998 | } | |
2999 | else | |
3000 | { | |
3001 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3002 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3003 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab | 3004 | - target->got_size()); |
2e702c99 RM |
3005 | } |
3006 | if (optimized_type == tls::TLSOPT_TO_IE) | |
07f397ab | 3007 | { |
7bf1f802 | 3008 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
3009 | got_offset, view, view_size); |
3010 | break; | |
3011 | } | |
3012 | else if (optimized_type == tls::TLSOPT_NONE) | |
3013 | { | |
3014 | // Relocate the field with the offset of the pair of GOT | |
3015 | // entries. | |
3016 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3017 | break; | |
07f397ab | 3018 | } |
2e702c99 | 3019 | } |
75f2446e ILT |
3020 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3021 | _("unsupported reloc %u"), | |
3022 | r_type); | |
92e059d8 ILT |
3023 | break; |
3024 | ||
56622147 ILT |
3025 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
3026 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 3027 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 | 3028 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3029 | { |
62855347 ILT |
3030 | if (tls_segment == NULL) |
3031 | { | |
191f1a2d ILT |
3032 | gold_assert(parameters->errors()->error_count() > 0 |
3033 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3034 | return; |
3035 | } | |
c2b45e22 | 3036 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3037 | rel, r_type, value, view, |
3038 | view_size); | |
c2b45e22 | 3039 | break; |
2e702c99 | 3040 | } |
c2b45e22 | 3041 | else |
2e702c99 RM |
3042 | { |
3043 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3044 | ? GOT_TYPE_TLS_NOFFSET | |
3045 | : GOT_TYPE_TLS_DESC); | |
3046 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3047 | if (r_type == elfcpp::R_386_TLS_GOTDESC |
3048 | && optimized_type == tls::TLSOPT_NONE) | |
3049 | { | |
3050 | // We created GOT entries in the .got.tlsdesc portion of | |
3051 | // the .got.plt section, but the offset stored in the | |
3052 | // symbol is the offset within .got.tlsdesc. | |
3053 | got_offset = (target->got_size() | |
3054 | + target->got_plt_section()->data_size()); | |
3055 | } | |
2e702c99 RM |
3056 | if (gsym != NULL) |
3057 | { | |
3058 | gold_assert(gsym->has_got_offset(got_type)); | |
3059 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3060 | } | |
3061 | else | |
3062 | { | |
3063 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3064 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3065 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3066 | - target->got_size()); |
2e702c99 RM |
3067 | } |
3068 | if (optimized_type == tls::TLSOPT_TO_IE) | |
c2b45e22 | 3069 | { |
62855347 ILT |
3070 | if (tls_segment == NULL) |
3071 | { | |
191f1a2d ILT |
3072 | gold_assert(parameters->errors()->error_count() > 0 |
3073 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3074 | return; |
3075 | } | |
c2b45e22 | 3076 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
3077 | got_offset, view, view_size); |
3078 | break; | |
3079 | } | |
3080 | else if (optimized_type == tls::TLSOPT_NONE) | |
3081 | { | |
3082 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3083 | { | |
3084 | // Relocate the field with the offset of the pair of GOT | |
3085 | // entries. | |
3086 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3087 | } | |
3088 | break; | |
c2b45e22 | 3089 | } |
2e702c99 | 3090 | } |
75f2446e ILT |
3091 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3092 | _("unsupported reloc %u"), | |
3093 | r_type); | |
ead1e424 ILT |
3094 | break; |
3095 | ||
56622147 | 3096 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
3097 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
3098 | { | |
75f2446e ILT |
3099 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3100 | _("both SUN and GNU model " | |
3101 | "TLS relocations")); | |
3102 | break; | |
46cf9fa2 ILT |
3103 | } |
3104 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 3105 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 3106 | { |
62855347 ILT |
3107 | if (tls_segment == NULL) |
3108 | { | |
191f1a2d ILT |
3109 | gold_assert(parameters->errors()->error_count() > 0 |
3110 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3111 | return; |
3112 | } | |
46cf9fa2 ILT |
3113 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
3114 | value, view, view_size); | |
3115 | break; | |
3116 | } | |
07f397ab | 3117 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3118 | { |
3119 | // Relocate the field with the offset of the GOT entry for | |
3120 | // the module index. | |
3121 | unsigned int got_offset; | |
3122 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
94c4710f | 3123 | - target->got_size()); |
2e702c99 RM |
3124 | Relocate_functions<32, false>::rel32(view, got_offset); |
3125 | break; | |
3126 | } | |
75f2446e ILT |
3127 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3128 | _("unsupported reloc %u"), | |
3129 | r_type); | |
46cf9fa2 ILT |
3130 | break; |
3131 | ||
56622147 | 3132 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 3133 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 3134 | { |
82bb573a ILT |
3135 | // This reloc can appear in debugging sections, in which |
3136 | // case we must not convert to local-exec. We decide what | |
3137 | // to do based on whether the section is marked as | |
3138 | // containing executable code. That is what the GNU linker | |
3139 | // does as well. | |
3140 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
3141 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 3142 | { |
62855347 ILT |
3143 | if (tls_segment == NULL) |
3144 | { | |
191f1a2d ILT |
3145 | gold_assert(parameters->errors()->error_count() > 0 |
3146 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3147 | return; |
3148 | } | |
d6f22b98 ILT |
3149 | value -= tls_segment->memsz(); |
3150 | } | |
e8a9fcda | 3151 | } |
46cf9fa2 ILT |
3152 | Relocate_functions<32, false>::rel32(view, value); |
3153 | break; | |
3154 | ||
56622147 ILT |
3155 | case elfcpp::R_386_TLS_IE: // Initial-exec |
3156 | case elfcpp::R_386_TLS_GOTIE: | |
3157 | case elfcpp::R_386_TLS_IE_32: | |
3158 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3159 | { | |
62855347 ILT |
3160 | if (tls_segment == NULL) |
3161 | { | |
191f1a2d ILT |
3162 | gold_assert(parameters->errors()->error_count() > 0 |
3163 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3164 | return; |
3165 | } | |
56622147 ILT |
3166 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
3167 | rel, r_type, value, view, | |
3168 | view_size); | |
3169 | break; | |
3170 | } | |
07f397ab | 3171 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3172 | { |
3173 | // Relocate the field with the offset of the GOT entry for | |
3174 | // the tp-relative offset of the symbol. | |
c2b45e22 | 3175 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2e702c99 RM |
3176 | ? GOT_TYPE_TLS_OFFSET |
3177 | : GOT_TYPE_TLS_NOFFSET); | |
3178 | unsigned int got_offset; | |
3179 | if (gsym != NULL) | |
3180 | { | |
3181 | gold_assert(gsym->has_got_offset(got_type)); | |
3182 | got_offset = gsym->got_offset(got_type); | |
3183 | } | |
3184 | else | |
3185 | { | |
3186 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3187 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3188 | got_offset = object->local_got_offset(r_sym, got_type); | |
3189 | } | |
3190 | // For the R_386_TLS_IE relocation, we need to apply the | |
3191 | // absolute address of the GOT entry. | |
3192 | if (r_type == elfcpp::R_386_TLS_IE) | |
3193 | got_offset += target->got_plt_section()->address(); | |
3194 | // All GOT offsets are relative to the end of the GOT. | |
3195 | got_offset -= target->got_size(); | |
3196 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3197 | break; | |
3198 | } | |
75f2446e ILT |
3199 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3200 | _("unsupported reloc %u"), | |
3201 | r_type); | |
92e059d8 | 3202 | break; |
92e059d8 | 3203 | |
56622147 | 3204 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
3205 | // If we're creating a shared library, a dynamic relocation will |
3206 | // have been created for this location, so do not apply it now. | |
8851ecca | 3207 | if (!parameters->options().shared()) |
2e702c99 | 3208 | { |
62855347 ILT |
3209 | if (tls_segment == NULL) |
3210 | { | |
191f1a2d ILT |
3211 | gold_assert(parameters->errors()->error_count() > 0 |
3212 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3213 | return; |
3214 | } | |
2e702c99 RM |
3215 | value -= tls_segment->memsz(); |
3216 | Relocate_functions<32, false>::rel32(view, value); | |
3217 | } | |
56622147 | 3218 | break; |
92e059d8 | 3219 | |
56622147 | 3220 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
3221 | // If we're creating a shared library, a dynamic relocation will |
3222 | // have been created for this location, so do not apply it now. | |
8851ecca | 3223 | if (!parameters->options().shared()) |
2e702c99 | 3224 | { |
62855347 ILT |
3225 | if (tls_segment == NULL) |
3226 | { | |
191f1a2d ILT |
3227 | gold_assert(parameters->errors()->error_count() > 0 |
3228 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3229 | return; |
3230 | } | |
2e702c99 RM |
3231 | value = tls_segment->memsz() - value; |
3232 | Relocate_functions<32, false>::rel32(view, value); | |
3233 | } | |
56622147 | 3234 | break; |
92e059d8 | 3235 | } |
92e059d8 ILT |
3236 | } |
3237 | ||
e041f13d | 3238 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
3239 | // Local-Exec. |
3240 | ||
3241 | inline void | |
3242 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
3243 | size_t relnum, | |
3244 | Output_segment* tls_segment, | |
3245 | const elfcpp::Rel<32, false>& rel, | |
3246 | unsigned int, | |
3247 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3248 | unsigned char* view, | |
fe8718a4 | 3249 | section_size_type view_size) |
ead1e424 ILT |
3250 | { |
3251 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 3252 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
3253 | // leal foo(%reg),%eax; call ___tls_get_addr |
3254 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
3255 | ||
af6359d5 ILT |
3256 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3257 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
3258 | |
3259 | unsigned char op1 = view[-1]; | |
3260 | unsigned char op2 = view[-2]; | |
3261 | ||
af6359d5 | 3262 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3263 | op2 == 0x8d || op2 == 0x04); |
af6359d5 | 3264 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
ead1e424 ILT |
3265 | |
3266 | int roff = 5; | |
3267 | ||
3268 | if (op2 == 0x04) | |
3269 | { | |
af6359d5 ILT |
3270 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
3271 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3272 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3273 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
ead1e424 ILT |
3274 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
3275 | } | |
3276 | else | |
3277 | { | |
af6359d5 | 3278 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3279 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3280 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3281 | && view[9] == 0x90) |
ead1e424 ILT |
3282 | { |
3283 | // There is a trailing nop. Use the size byte subl. | |
3284 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3285 | roff = 6; | |
3286 | } | |
3287 | else | |
3288 | { | |
3289 | // Use the five byte subl. | |
3290 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3291 | } | |
3292 | } | |
3293 | ||
7bf1f802 | 3294 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3295 | Relocate_functions<32, false>::rel32(view + roff, value); |
3296 | ||
3297 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3298 | // We can skip it. | |
3299 | this->skip_call_tls_get_addr_ = true; | |
3300 | } | |
3301 | ||
7bf1f802 | 3302 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3303 | // Initial-Exec. |
3304 | ||
3305 | inline void | |
3306 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3307 | size_t relnum, | |
c2b45e22 | 3308 | Output_segment*, |
07f397ab ILT |
3309 | const elfcpp::Rel<32, false>& rel, |
3310 | unsigned int, | |
3311 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3312 | unsigned char* view, | |
fe8718a4 | 3313 | section_size_type view_size) |
07f397ab ILT |
3314 | { |
3315 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3316 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
152f7024 CC |
3317 | // leal foo(%ebx),%eax; call ___tls_get_addr; nop |
3318 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
07f397ab ILT |
3319 | |
3320 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3321 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3322 | ||
3323 | unsigned char op1 = view[-1]; | |
3324 | unsigned char op2 = view[-2]; | |
3325 | ||
3326 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3327 | op2 == 0x8d || op2 == 0x04); |
07f397ab ILT |
3328 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
3329 | ||
152f7024 | 3330 | int roff; |
07f397ab ILT |
3331 | |
3332 | if (op2 == 0x04) | |
3333 | { | |
3334 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3335 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3336 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3337 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
152f7024 | 3338 | roff = 5; |
07f397ab ILT |
3339 | } |
3340 | else | |
3341 | { | |
152f7024 | 3342 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 10); |
07f397ab | 3343 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3344 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
152f7024 CC |
3345 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[9] == 0x90); |
3346 | roff = 6; | |
07f397ab ILT |
3347 | } |
3348 | ||
152f7024 | 3349 | memcpy(view + roff - 8, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); |
07f397ab ILT |
3350 | Relocate_functions<32, false>::rel32(view + roff, value); |
3351 | ||
3352 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3353 | // We can skip it. | |
3354 | this->skip_call_tls_get_addr_ = true; | |
3355 | } | |
3356 | ||
c2b45e22 CC |
3357 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3358 | // General-Dynamic to a Local-Exec. | |
3359 | ||
3360 | inline void | |
3361 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3362 | const Relocate_info<32, false>* relinfo, | |
3363 | size_t relnum, | |
3364 | Output_segment* tls_segment, | |
3365 | const elfcpp::Rel<32, false>& rel, | |
3366 | unsigned int r_type, | |
3367 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3368 | unsigned char* view, | |
3369 | section_size_type view_size) | |
3370 | { | |
3371 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3372 | { | |
3373 | // leal foo@TLSDESC(%ebx), %eax | |
3374 | // ==> leal foo@NTPOFF, %eax | |
3375 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3376 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3377 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3378 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3379 | view[-1] = 0x05; |
3380 | value -= tls_segment->memsz(); | |
3381 | Relocate_functions<32, false>::rel32(view, value); | |
3382 | } | |
3383 | else | |
3384 | { | |
3385 | // call *foo@TLSCALL(%eax) | |
3386 | // ==> nop; nop | |
3387 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3388 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3389 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3390 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3391 | view[0] = 0x66; |
3392 | view[1] = 0x90; | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3397 | // General-Dynamic to an Initial-Exec. | |
3398 | ||
3399 | inline void | |
3400 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3401 | const Relocate_info<32, false>* relinfo, | |
3402 | size_t relnum, | |
3403 | Output_segment*, | |
3404 | const elfcpp::Rel<32, false>& rel, | |
3405 | unsigned int r_type, | |
3406 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3407 | unsigned char* view, | |
3408 | section_size_type view_size) | |
3409 | { | |
3410 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3411 | { | |
3412 | // leal foo@TLSDESC(%ebx), %eax | |
3413 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3414 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3415 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3416 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3417 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3418 | view[-2] = 0x8b; |
3419 | Relocate_functions<32, false>::rel32(view, value); | |
3420 | } | |
3421 | else | |
3422 | { | |
3423 | // call *foo@TLSCALL(%eax) | |
3424 | // ==> nop; nop | |
3425 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3426 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3427 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3428 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3429 | view[0] = 0x66; |
3430 | view[1] = 0x90; | |
3431 | } | |
3432 | } | |
3433 | ||
46cf9fa2 ILT |
3434 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3435 | // Local-Exec. | |
3436 | ||
3437 | inline void | |
3438 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3439 | size_t relnum, | |
3440 | Output_segment*, | |
3441 | const elfcpp::Rel<32, false>& rel, | |
3442 | unsigned int, | |
3443 | elfcpp::Elf_types<32>::Elf_Addr, | |
3444 | unsigned char* view, | |
fe8718a4 | 3445 | section_size_type view_size) |
46cf9fa2 ILT |
3446 | { |
3447 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3448 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3449 | ||
af6359d5 ILT |
3450 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3451 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3452 | |
3453 | // FIXME: Does this test really always pass? | |
af6359d5 | 3454 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3455 | view[-2] == 0x8d && view[-1] == 0x83); |
46cf9fa2 | 3456 | |
af6359d5 | 3457 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3458 | |
3459 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3460 | ||
3461 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3462 | // We can skip it. | |
3463 | this->skip_call_tls_get_addr_ = true; | |
3464 | } | |
3465 | ||
56622147 ILT |
3466 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3467 | // Local-Exec. | |
3468 | ||
3469 | inline void | |
3470 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3471 | size_t relnum, | |
3472 | Output_segment* tls_segment, | |
3473 | const elfcpp::Rel<32, false>& rel, | |
3474 | unsigned int r_type, | |
3475 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3476 | unsigned char* view, | |
fe8718a4 | 3477 | section_size_type view_size) |
56622147 ILT |
3478 | { |
3479 | // We have to actually change the instructions, which means that we | |
3480 | // need to examine the opcodes to figure out which instruction we | |
3481 | // are looking at. | |
3482 | if (r_type == elfcpp::R_386_TLS_IE) | |
3483 | { | |
3484 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3485 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3486 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3487 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3488 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3489 | ||
3490 | unsigned char op1 = view[-1]; | |
3491 | if (op1 == 0xa1) | |
3492 | { | |
3493 | // movl XX,%eax ==> movl $YY,%eax | |
3494 | view[-1] = 0xb8; | |
3495 | } | |
3496 | else | |
3497 | { | |
3498 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3499 | ||
3500 | unsigned char op2 = view[-2]; | |
3501 | if (op2 == 0x8b) | |
3502 | { | |
3503 | // movl XX,%reg ==> movl $YY,%reg | |
3504 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3505 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3506 | view[-2] = 0xc7; |
3507 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3508 | } | |
3509 | else if (op2 == 0x03) | |
3510 | { | |
3511 | // addl XX,%reg ==> addl $YY,%reg | |
3512 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3513 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3514 | view[-2] = 0x81; |
3515 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3516 | } | |
3517 | else | |
3518 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3519 | } | |
3520 | } | |
3521 | else | |
3522 | { | |
3523 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3524 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3525 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3526 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3527 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3528 | ||
3529 | unsigned char op1 = view[-1]; | |
3530 | unsigned char op2 = view[-2]; | |
3531 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3532 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); |
56622147 ILT |
3533 | if (op2 == 0x8b) |
3534 | { | |
3535 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3536 | view[-2] = 0xc7; | |
3537 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3538 | } | |
3539 | else if (op2 == 0x2b) | |
3540 | { | |
3541 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3542 | view[-2] = 0x81; | |
3543 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3544 | } | |
3545 | else if (op2 == 0x03) | |
3546 | { | |
3547 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3548 | view[-2] = 0x81; | |
3549 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3550 | } | |
3551 | else | |
3552 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3553 | } | |
3554 | ||
7bf1f802 | 3555 | value = tls_segment->memsz() - value; |
56622147 ILT |
3556 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3557 | value = - value; | |
3558 | ||
3559 | Relocate_functions<32, false>::rel32(view, value); | |
3560 | } | |
3561 | ||
61ba1cf9 ILT |
3562 | // Relocate section data. |
3563 | ||
3564 | void | |
92e059d8 | 3565 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3566 | unsigned int sh_type, |
3567 | const unsigned char* prelocs, | |
3568 | size_t reloc_count, | |
730cdc88 ILT |
3569 | Output_section* output_section, |
3570 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3571 | unsigned char* view, |
3572 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3573 | section_size_type view_size, |
3574 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3575 | { |
a3ad94ed | 3576 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3577 | |
ead1e424 | 3578 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
168a4726 | 3579 | Target_i386::Relocate, gold::Default_comdat_behavior>( |
92e059d8 | 3580 | relinfo, |
ead1e424 | 3581 | this, |
61ba1cf9 ILT |
3582 | prelocs, |
3583 | reloc_count, | |
730cdc88 ILT |
3584 | output_section, |
3585 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3586 | view, |
3587 | address, | |
364c7fa5 ILT |
3588 | view_size, |
3589 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3590 | } |
3591 | ||
6a74a719 ILT |
3592 | // Return the size of a relocation while scanning during a relocatable |
3593 | // link. | |
3594 | ||
3595 | unsigned int | |
3596 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3597 | unsigned int r_type, | |
3598 | Relobj* object) | |
3599 | { | |
3600 | switch (r_type) | |
3601 | { | |
3602 | case elfcpp::R_386_NONE: | |
3603 | case elfcpp::R_386_GNU_VTINHERIT: | |
3604 | case elfcpp::R_386_GNU_VTENTRY: | |
3605 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3606 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3607 | case elfcpp::R_386_TLS_DESC_CALL: | |
3608 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3609 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3610 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3611 | case elfcpp::R_386_TLS_IE_32: | |
3612 | case elfcpp::R_386_TLS_GOTIE: | |
3613 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3614 | case elfcpp::R_386_TLS_LE_32: | |
3615 | return 0; | |
3616 | ||
3617 | case elfcpp::R_386_32: | |
3618 | case elfcpp::R_386_PC32: | |
3619 | case elfcpp::R_386_GOT32: | |
3620 | case elfcpp::R_386_PLT32: | |
3621 | case elfcpp::R_386_GOTOFF: | |
3622 | case elfcpp::R_386_GOTPC: | |
3623 | return 4; | |
3624 | ||
3625 | case elfcpp::R_386_16: | |
3626 | case elfcpp::R_386_PC16: | |
3627 | return 2; | |
3628 | ||
3629 | case elfcpp::R_386_8: | |
3630 | case elfcpp::R_386_PC8: | |
3631 | return 1; | |
3632 | ||
3633 | // These are relocations which should only be seen by the | |
3634 | // dynamic linker, and should never be seen here. | |
3635 | case elfcpp::R_386_COPY: | |
3636 | case elfcpp::R_386_GLOB_DAT: | |
3637 | case elfcpp::R_386_JUMP_SLOT: | |
3638 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3639 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3640 | case elfcpp::R_386_TLS_TPOFF: |
3641 | case elfcpp::R_386_TLS_DTPMOD32: | |
3642 | case elfcpp::R_386_TLS_DTPOFF32: | |
3643 | case elfcpp::R_386_TLS_TPOFF32: | |
3644 | case elfcpp::R_386_TLS_DESC: | |
3645 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3646 | return 0; | |
3647 | ||
3648 | case elfcpp::R_386_32PLT: | |
3649 | case elfcpp::R_386_TLS_GD_32: | |
3650 | case elfcpp::R_386_TLS_GD_PUSH: | |
3651 | case elfcpp::R_386_TLS_GD_CALL: | |
3652 | case elfcpp::R_386_TLS_GD_POP: | |
3653 | case elfcpp::R_386_TLS_LDM_32: | |
3654 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3655 | case elfcpp::R_386_TLS_LDM_CALL: | |
3656 | case elfcpp::R_386_TLS_LDM_POP: | |
3657 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3658 | default: | |
3659 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3660 | return 0; | |
3661 | } | |
3662 | } | |
3663 | ||
3664 | // Scan the relocs during a relocatable link. | |
3665 | ||
3666 | void | |
ad0f2072 | 3667 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3668 | Layout* layout, |
6fa2a40b | 3669 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3670 | unsigned int data_shndx, |
3671 | unsigned int sh_type, | |
3672 | const unsigned char* prelocs, | |
3673 | size_t reloc_count, | |
3674 | Output_section* output_section, | |
3675 | bool needs_special_offset_handling, | |
3676 | size_t local_symbol_count, | |
3677 | const unsigned char* plocal_symbols, | |
3678 | Relocatable_relocs* rr) | |
3679 | { | |
3680 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3681 | ||
3682 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3683 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3684 | ||
7019cd25 | 3685 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3686 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3687 | symtab, |
3688 | layout, | |
3689 | object, | |
3690 | data_shndx, | |
3691 | prelocs, | |
3692 | reloc_count, | |
3693 | output_section, | |
3694 | needs_special_offset_handling, | |
3695 | local_symbol_count, | |
3696 | plocal_symbols, | |
3697 | rr); | |
3698 | } | |
3699 | ||
7404fe1b | 3700 | // Emit relocations for a section. |
6a74a719 ILT |
3701 | |
3702 | void | |
7404fe1b | 3703 | Target_i386::relocate_relocs( |
6a74a719 ILT |
3704 | const Relocate_info<32, false>* relinfo, |
3705 | unsigned int sh_type, | |
3706 | const unsigned char* prelocs, | |
3707 | size_t reloc_count, | |
3708 | Output_section* output_section, | |
cc928013 | 3709 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
3710 | const Relocatable_relocs* rr, |
3711 | unsigned char* view, | |
3712 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3713 | section_size_type view_size, | |
3714 | unsigned char* reloc_view, | |
3715 | section_size_type reloc_view_size) | |
3716 | { | |
3717 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3718 | ||
7404fe1b | 3719 | gold::relocate_relocs<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3720 | relinfo, |
3721 | prelocs, | |
3722 | reloc_count, | |
3723 | output_section, | |
3724 | offset_in_output_section, | |
3725 | rr, | |
3726 | view, | |
3727 | view_address, | |
3728 | view_size, | |
3729 | reloc_view, | |
3730 | reloc_view_size); | |
3731 | } | |
3732 | ||
ab5c9e90 ILT |
3733 | // Return the value to use for a dynamic which requires special |
3734 | // treatment. This is how we support equality comparisons of function | |
3735 | // pointers across shared library boundaries, as described in the | |
3736 | // processor specific ABI supplement. | |
3737 | ||
3738 | uint64_t | |
3739 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3740 | { | |
3741 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 3742 | return this->plt_address_for_global(gsym); |
ab5c9e90 ILT |
3743 | } |
3744 | ||
c51e6221 ILT |
3745 | // Return a string used to fill a code section with nops to take up |
3746 | // the specified length. | |
3747 | ||
3748 | std::string | |
8851ecca | 3749 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3750 | { |
3751 | if (length >= 16) | |
3752 | { | |
3753 | // Build a jmp instruction to skip over the bytes. | |
3754 | unsigned char jmp[5]; | |
3755 | jmp[0] = 0xe9; | |
3756 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3757 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2e702c99 | 3758 | + std::string(length - 5, static_cast<char>(0x90))); |
c51e6221 ILT |
3759 | } |
3760 | ||
3761 | // Nop sequences of various lengths. | |
76677ad0 CC |
3762 | const char nop1[1] = { '\x90' }; // nop |
3763 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3764 | const char nop3[3] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi | |
3765 | const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
3766 | '\x00'}; | |
3767 | const char nop5[5] = { '\x90', '\x8d', '\x74', // nop | |
2e702c99 | 3768 | '\x26', '\x00' }; // leal 0(%esi,1),%esi |
76677ad0 | 3769 | const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi |
2e702c99 | 3770 | '\x00', '\x00', '\x00' }; |
76677ad0 | 3771 | const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3772 | '\x00', '\x00', '\x00', |
76677ad0 CC |
3773 | '\x00' }; |
3774 | const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop | |
2e702c99 | 3775 | '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi |
76677ad0 CC |
3776 | '\x00', '\x00' }; |
3777 | const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi | |
2e702c99 | 3778 | '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3779 | '\x00', '\x00', '\x00' }; |
3780 | const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi | |
2e702c99 | 3781 | '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3782 | '\x00', '\x00', '\x00', |
3783 | '\x00' }; | |
3784 | const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
2e702c99 | 3785 | '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3786 | '\x27', '\x00', '\x00', |
3787 | '\x00', '\x00' }; | |
3788 | const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3789 | '\x00', '\x00', '\x00', // leal 0L(%edi),%edi |
76677ad0 CC |
3790 | '\x8d', '\xbf', '\x00', |
3791 | '\x00', '\x00', '\x00' }; | |
3792 | const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3793 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3794 | '\x8d', '\xbc', '\x27', |
3795 | '\x00', '\x00', '\x00', | |
2e702c99 | 3796 | '\x00' }; |
76677ad0 | 3797 | const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3798 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3799 | '\x00', '\x8d', '\xbc', |
3800 | '\x27', '\x00', '\x00', | |
2e702c99 | 3801 | '\x00', '\x00' }; |
76677ad0 | 3802 | const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15 |
2e702c99 | 3803 | '\x90', '\x90', '\x90', // nop,nop,nop,... |
76677ad0 CC |
3804 | '\x90', '\x90', '\x90', |
3805 | '\x90', '\x90', '\x90', | |
2e702c99 | 3806 | '\x90', '\x90', '\x90' }; |
c51e6221 ILT |
3807 | |
3808 | const char* nops[16] = { | |
3809 | NULL, | |
3810 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3811 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3812 | }; | |
3813 | ||
3814 | return std::string(nops[length], length); | |
3815 | } | |
3816 | ||
02d7cd44 ILT |
3817 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3818 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3819 | // assembler can not write out the difference between two labels in | |
3820 | // different sections, so instead of using a pc-relative value they | |
3821 | // use an offset from the GOT. | |
3822 | ||
3823 | uint64_t | |
3824 | Target_i386::do_ehframe_datarel_base() const | |
3825 | { | |
3826 | gold_assert(this->global_offset_table_ != NULL); | |
3827 | Symbol* sym = this->global_offset_table_; | |
3828 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3829 | return ssym->value(); | |
3830 | } | |
3831 | ||
b6848d3c ILT |
3832 | // Return whether SYM should be treated as a call to a non-split |
3833 | // function. We don't want that to be true of a call to a | |
3834 | // get_pc_thunk function. | |
3835 | ||
3836 | bool | |
3837 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3838 | { | |
3839 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3840 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3841 | } | |
3842 | ||
364c7fa5 | 3843 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3844 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3845 | // code. We have to change the function so that it always ensures |
3846 | // that it has enough stack space to run some random function. | |
3847 | ||
3848 | void | |
3849 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2e702c99 RM |
3850 | section_offset_type fnoffset, |
3851 | section_size_type fnsize, | |
3852 | unsigned char* view, | |
3853 | section_size_type view_size, | |
3854 | std::string* from, | |
3855 | std::string* to) const | |
364c7fa5 ILT |
3856 | { |
3857 | // The function starts with a comparison of the stack pointer and a | |
3858 | // field in the TCB. This is followed by a jump. | |
3859 | ||
3860 | // cmp %gs:NN,%esp | |
3861 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3862 | && fnsize > 7) | |
3863 | { | |
3864 | // We will call __morestack if the carry flag is set after this | |
3865 | // comparison. We turn the comparison into an stc instruction | |
3866 | // and some nops. | |
3867 | view[fnoffset] = '\xf9'; | |
3868 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3869 | } | |
3870 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3871 | // lea NN(%esp),%edx |
3872 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3873 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3874 | && fnsize > 7) |
3875 | { | |
3876 | // This is loading an offset from the stack pointer for a | |
3877 | // comparison. The offset is negative, so we decrease the | |
3878 | // offset by the amount of space we need for the stack. This | |
3879 | // means we will avoid calling __morestack if there happens to | |
3880 | // be plenty of space on the stack already. | |
3881 | unsigned char* pval = view + fnoffset + 3; | |
3882 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3883 | val -= parameters->options().split_stack_adjust_size(); | |
3884 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3885 | } | |
3886 | else | |
3887 | { | |
3888 | if (!object->has_no_split_stack()) | |
3889 | object->error(_("failed to match split-stack sequence at " | |
3890 | "section %u offset %0zx"), | |
ac33a407 | 3891 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3892 | return; |
3893 | } | |
3894 | ||
3895 | // We have to change the function so that it calls | |
3896 | // __morestack_non_split instead of __morestack. The former will | |
3897 | // allocate additional stack space. | |
3898 | *from = "__morestack"; | |
3899 | *to = "__morestack_non_split"; | |
3900 | } | |
3901 | ||
2e702c99 RM |
3902 | // The selector for i386 object files. Note this is never instantiated |
3903 | // directly. It's only used in Target_selector_i386_nacl, below. | |
14bfc3f5 | 3904 | |
36959681 | 3905 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3906 | { |
3907 | public: | |
3908 | Target_selector_i386() | |
36959681 | 3909 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3910 | "elf32-i386", "elf32-i386-freebsd", |
3911 | "elf_i386") | |
14bfc3f5 ILT |
3912 | { } |
3913 | ||
3914 | Target* | |
e96caa79 ILT |
3915 | do_instantiate_target() |
3916 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3917 | }; |
3918 | ||
2e702c99 RM |
3919 | // NaCl variant. It uses different PLT contents. |
3920 | ||
3921 | class Output_data_plt_i386_nacl : public Output_data_plt_i386 | |
3922 | { | |
3923 | public: | |
3924 | Output_data_plt_i386_nacl(Layout* layout, | |
57b2284c | 3925 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
3926 | Output_data_space* got_irelative) |
3927 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
3928 | { } | |
3929 | ||
3930 | protected: | |
3931 | virtual unsigned int | |
3932 | do_get_plt_entry_size() const | |
3933 | { return plt_entry_size; } | |
3934 | ||
3935 | virtual void | |
3936 | do_add_eh_frame(Layout* layout) | |
3937 | { | |
3938 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
3939 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
3940 | } | |
3941 | ||
3942 | // The size of an entry in the PLT. | |
3943 | static const int plt_entry_size = 64; | |
3944 | ||
3945 | // The .eh_frame unwind information for the PLT. | |
3946 | static const int plt_eh_frame_fde_size = 32; | |
3947 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
3948 | }; | |
3949 | ||
3950 | class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl | |
3951 | { | |
3952 | public: | |
3953 | Output_data_plt_i386_nacl_exec(Layout* layout, | |
57b2284c | 3954 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
3955 | Output_data_space* got_irelative) |
3956 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3957 | { } | |
3958 | ||
3959 | protected: | |
3960 | virtual void | |
3961 | do_fill_first_plt_entry(unsigned char* pov, | |
3962 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
3963 | ||
3964 | virtual unsigned int | |
3965 | do_fill_plt_entry(unsigned char* pov, | |
3966 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
3967 | unsigned int got_offset, | |
3968 | unsigned int plt_offset, | |
3969 | unsigned int plt_rel_offset); | |
3970 | ||
3971 | private: | |
3972 | // The first entry in the PLT for an executable. | |
3973 | static const unsigned char first_plt_entry[plt_entry_size]; | |
3974 | ||
3975 | // Other entries in the PLT for an executable. | |
3976 | static const unsigned char plt_entry[plt_entry_size]; | |
3977 | }; | |
3978 | ||
3979 | class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl | |
3980 | { | |
3981 | public: | |
3982 | Output_data_plt_i386_nacl_dyn(Layout* layout, | |
57b2284c | 3983 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
3984 | Output_data_space* got_irelative) |
3985 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3986 | { } | |
3987 | ||
3988 | protected: | |
3989 | virtual void | |
3990 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
3991 | ||
3992 | virtual unsigned int | |
3993 | do_fill_plt_entry(unsigned char* pov, | |
3994 | elfcpp::Elf_types<32>::Elf_Addr, | |
3995 | unsigned int got_offset, | |
3996 | unsigned int plt_offset, | |
3997 | unsigned int plt_rel_offset); | |
3998 | ||
3999 | private: | |
4000 | // The first entry in the PLT for a shared object. | |
4001 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4002 | ||
4003 | // Other entries in the PLT for a shared object. | |
4004 | static const unsigned char plt_entry[plt_entry_size]; | |
4005 | }; | |
4006 | ||
4007 | class Target_i386_nacl : public Target_i386 | |
4008 | { | |
4009 | public: | |
4010 | Target_i386_nacl() | |
4011 | : Target_i386(&i386_nacl_info) | |
4012 | { } | |
4013 | ||
4014 | protected: | |
4015 | virtual Output_data_plt_i386* | |
4016 | do_make_data_plt(Layout* layout, | |
57b2284c | 4017 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4018 | Output_data_space* got_irelative, |
4019 | bool dyn) | |
4020 | { | |
4021 | if (dyn) | |
4022 | return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative); | |
4023 | else | |
4024 | return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative); | |
4025 | } | |
4026 | ||
93f8221c RM |
4027 | virtual std::string |
4028 | do_code_fill(section_size_type length) const; | |
4029 | ||
2e702c99 RM |
4030 | private: |
4031 | static const Target::Target_info i386_nacl_info; | |
4032 | }; | |
4033 | ||
4034 | const Target::Target_info Target_i386_nacl::i386_nacl_info = | |
4035 | { | |
4036 | 32, // size | |
4037 | false, // is_big_endian | |
4038 | elfcpp::EM_386, // machine_code | |
4039 | false, // has_make_symbol | |
4040 | false, // has_resolve | |
4041 | true, // has_code_fill | |
4042 | true, // is_default_stack_executable | |
4043 | true, // can_icf_inline_merge_sections | |
4044 | '\0', // wrap_char | |
4045 | "/lib/ld-nacl-x86-32.so.1", // dynamic_linker | |
4046 | 0x20000, // default_text_segment_address | |
4047 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4048 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4049 | true, // isolate_execinstr | |
4050 | 0x10000000, // rosegment_gap | |
4051 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4052 | elfcpp::SHN_UNDEF, // large_common_shndx | |
4053 | 0, // small_common_section_flags | |
4054 | 0, // large_common_section_flags | |
4055 | NULL, // attributes_section | |
a67858e0 CC |
4056 | NULL, // attributes_vendor |
4057 | "_start" // entry_symbol_name | |
2e702c99 RM |
4058 | }; |
4059 | ||
4060 | #define NACLMASK 0xe0 // 32-byte alignment mask | |
4061 | ||
4062 | const unsigned char | |
4063 | Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] = | |
4064 | { | |
4065 | 0xff, 0x35, // pushl contents of memory address | |
4066 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
4067 | 0x8b, 0x0d, // movl contents of address, %ecx | |
4068 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4069 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4070 | 0xff, 0xe1, // jmp *%ecx | |
4071 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4072 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4073 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4074 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4075 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4076 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4077 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4078 | 0x90, 0x90, 0x90, 0x90, 0x90 | |
4079 | }; | |
4080 | ||
4081 | void | |
4082 | Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry( | |
4083 | unsigned char* pov, | |
4084 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
4085 | { | |
4086 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4087 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
4088 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
4089 | } | |
4090 | ||
4091 | // The first entry in the PLT for a shared object. | |
4092 | ||
4093 | const unsigned char | |
4094 | Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] = | |
4095 | { | |
4096 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
4097 | 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx | |
4098 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4099 | 0xff, 0xe1, // jmp *%ecx | |
4100 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4101 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4102 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4103 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4104 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4105 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4106 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4107 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4108 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4109 | 0x90, 0x90, 0x90, 0x90, 0x90 // nops | |
4110 | }; | |
4111 | ||
4112 | void | |
4113 | Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry( | |
4114 | unsigned char* pov, | |
4115 | elfcpp::Elf_types<32>::Elf_Addr) | |
4116 | { | |
4117 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4118 | } | |
4119 | ||
4120 | // Subsequent entries in the PLT for an executable. | |
4121 | ||
4122 | const unsigned char | |
4123 | Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] = | |
4124 | { | |
4125 | 0x8b, 0x0d, // movl contents of address, %ecx */ | |
4126 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4127 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4128 | 0xff, 0xe1, // jmp *%ecx | |
4129 | ||
4130 | // Pad to the next 32-byte boundary with nop instructions. | |
4131 | 0x90, | |
4132 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4133 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4134 | ||
4135 | // Lazy GOT entries point here (32-byte aligned). | |
4136 | 0x68, // pushl immediate | |
4137 | 0, 0, 0, 0, // replaced with offset into relocation table | |
4138 | 0xe9, // jmp relative | |
4139 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
4140 | ||
4141 | // Pad to the next 32-byte boundary with nop instructions. | |
4142 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4143 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4144 | 0x90, 0x90 | |
4145 | }; | |
4146 | ||
4147 | unsigned int | |
4148 | Output_data_plt_i386_nacl_exec::do_fill_plt_entry( | |
4149 | unsigned char* pov, | |
4150 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4151 | unsigned int got_offset, | |
4152 | unsigned int plt_offset, | |
4153 | unsigned int plt_rel_offset) | |
4154 | { | |
4155 | memcpy(pov, plt_entry, plt_entry_size); | |
4156 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4157 | got_address + got_offset); | |
4158 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4159 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4160 | return 32; | |
4161 | } | |
4162 | ||
4163 | // Subsequent entries in the PLT for a shared object. | |
4164 | ||
4165 | const unsigned char | |
4166 | Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] = | |
4167 | { | |
4168 | 0x8b, 0x8b, // movl offset(%ebx), %ecx | |
4169 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
4170 | 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx | |
4171 | 0xff, 0xe1, // jmp *%ecx | |
4172 | ||
4173 | // Pad to the next 32-byte boundary with nop instructions. | |
4174 | 0x90, | |
4175 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4176 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4177 | ||
4178 | // Lazy GOT entries point here (32-byte aligned). | |
4179 | 0x68, // pushl immediate | |
4180 | 0, 0, 0, 0, // replaced with offset into relocation table. | |
4181 | 0xe9, // jmp relative | |
4182 | 0, 0, 0, 0, // replaced with offset to start of .plt. | |
4183 | ||
4184 | // Pad to the next 32-byte boundary with nop instructions. | |
4185 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4186 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4187 | 0x90, 0x90 | |
4188 | }; | |
4189 | ||
4190 | unsigned int | |
4191 | Output_data_plt_i386_nacl_dyn::do_fill_plt_entry( | |
4192 | unsigned char* pov, | |
4193 | elfcpp::Elf_types<32>::Elf_Addr, | |
4194 | unsigned int got_offset, | |
4195 | unsigned int plt_offset, | |
4196 | unsigned int plt_rel_offset) | |
4197 | { | |
4198 | memcpy(pov, plt_entry, plt_entry_size); | |
4199 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
4200 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4201 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4202 | return 32; | |
4203 | } | |
4204 | ||
4205 | const unsigned char | |
4206 | Output_data_plt_i386_nacl::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4207 | { | |
4208 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4209 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4210 | 0, // Augmentation size. | |
4211 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
4212 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4213 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
4214 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4215 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4216 | 13, // Block length. | |
4217 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
4218 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
4219 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4220 | elfcpp::DW_OP_and, // & (%eip & 0x3f). | |
4221 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4222 | elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25) | |
4223 | elfcpp::DW_OP_lit2, // Push 2. | |
4224 | elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2) | |
4225 | elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4 | |
4226 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4227 | elfcpp::DW_CFA_nop | |
4228 | }; | |
4229 | ||
93f8221c RM |
4230 | // Return a string used to fill a code section with nops. |
4231 | // For NaCl, long NOPs are only valid if they do not cross | |
4232 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
4233 | std::string | |
4234 | Target_i386_nacl::do_code_fill(section_size_type length) const | |
4235 | { | |
4236 | return std::string(length, static_cast<char>(0x90)); | |
4237 | } | |
4238 | ||
2e702c99 RM |
4239 | // The selector for i386-nacl object files. |
4240 | ||
4241 | class Target_selector_i386_nacl | |
4242 | : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl> | |
4243 | { | |
4244 | public: | |
4245 | Target_selector_i386_nacl() | |
4246 | : Target_selector_nacl<Target_selector_i386, | |
4247 | Target_i386_nacl>("x86-32", | |
4248 | "elf32-i386-nacl", | |
4249 | "elf_i386_nacl") | |
4250 | { } | |
4251 | }; | |
4252 | ||
4253 | Target_selector_i386_nacl target_selector_i386; | |
14bfc3f5 ILT |
4254 | |
4255 | } // End anonymous namespace. |