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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 | 900 | NULL, // attributes_vendor |
8d9743bd MK |
901 | "_start", // entry_symbol_name |
902 | 32, // hash_entry_size | |
14bfc3f5 ILT |
903 | }; |
904 | ||
ead1e424 ILT |
905 | // Get the GOT section, creating it if necessary. |
906 | ||
dbe717ef | 907 | Output_data_got<32, false>* |
7e1edb90 | 908 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
909 | { |
910 | if (this->got_ == NULL) | |
911 | { | |
7e1edb90 | 912 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 913 | |
7e1edb90 | 914 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 915 | |
9446efde ILT |
916 | // When using -z now, we can treat .got.plt as a relro section. |
917 | // Without -z now, it is modified after program startup by lazy | |
918 | // PLT relocations. | |
919 | bool is_got_plt_relro = parameters->options().now(); | |
920 | Output_section_order got_order = (is_got_plt_relro | |
921 | ? ORDER_RELRO | |
922 | : ORDER_RELRO_LAST); | |
923 | Output_section_order got_plt_order = (is_got_plt_relro | |
924 | ? ORDER_RELRO | |
925 | : ORDER_NON_RELRO_FIRST); | |
926 | ||
82742395 ILT |
927 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
928 | (elfcpp::SHF_ALLOC | |
929 | | elfcpp::SHF_WRITE), | |
9446efde | 930 | this->got_, got_order, true); |
ead1e424 | 931 | |
57b2284c | 932 | this->got_plt_ = new Output_data_got_plt_i386(layout); |
82742395 ILT |
933 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
934 | (elfcpp::SHF_ALLOC | |
935 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
936 | this->got_plt_, got_plt_order, |
937 | is_got_plt_relro); | |
a3ad94ed | 938 | |
ead1e424 | 939 | // The first three entries are reserved. |
27bc2bce | 940 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 941 | |
9446efde ILT |
942 | if (!is_got_plt_relro) |
943 | { | |
944 | // Those bytes can go into the relro segment. | |
945 | layout->increase_relro(3 * 4); | |
946 | } | |
1a2dff53 | 947 | |
a3ad94ed | 948 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
949 | this->global_offset_table_ = |
950 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
951 | Symbol_table::PREDEFINED, | |
952 | this->got_plt_, | |
953 | 0, 0, elfcpp::STT_OBJECT, | |
954 | elfcpp::STB_LOCAL, | |
955 | elfcpp::STV_HIDDEN, 0, | |
956 | false, false); | |
a8df5856 | 957 | |
67181c72 ILT |
958 | // If there are any IRELATIVE relocations, they get GOT entries |
959 | // in .got.plt after the jump slot relocations. | |
960 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
961 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
962 | (elfcpp::SHF_ALLOC | |
963 | | elfcpp::SHF_WRITE), | |
964 | this->got_irelative_, | |
9446efde | 965 | got_plt_order, is_got_plt_relro); |
67181c72 | 966 | |
a8df5856 ILT |
967 | // If there are any TLSDESC relocations, they get GOT entries in |
968 | // .got.plt after the jump slot entries. | |
969 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
970 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
971 | (elfcpp::SHF_ALLOC | |
972 | | elfcpp::SHF_WRITE), | |
22f0da72 | 973 | this->got_tlsdesc_, |
9446efde | 974 | got_plt_order, is_got_plt_relro); |
ead1e424 | 975 | } |
a3ad94ed | 976 | |
ead1e424 ILT |
977 | return this->got_; |
978 | } | |
979 | ||
5a6f7e2d ILT |
980 | // Get the dynamic reloc section, creating it if necessary. |
981 | ||
982 | Target_i386::Reloc_section* | |
983 | Target_i386::rel_dyn_section(Layout* layout) | |
984 | { | |
985 | if (this->rel_dyn_ == NULL) | |
986 | { | |
987 | gold_assert(layout != NULL); | |
d98bc257 | 988 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 989 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
990 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
991 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
992 | } |
993 | return this->rel_dyn_; | |
994 | } | |
995 | ||
67181c72 ILT |
996 | // Get the section to use for IRELATIVE relocs, creating it if |
997 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
998 | // relocations. They need to follow the other dynamic relocations so | |
999 | // that they can refer to global variables initialized by those | |
1000 | // relocs. | |
1001 | ||
1002 | Target_i386::Reloc_section* | |
1003 | Target_i386::rel_irelative_section(Layout* layout) | |
1004 | { | |
1005 | if (this->rel_irelative_ == NULL) | |
1006 | { | |
1007 | // Make sure we have already create the dynamic reloc section. | |
1008 | this->rel_dyn_section(layout); | |
1009 | this->rel_irelative_ = new Reloc_section(false); | |
1010 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1011 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
1012 | ORDER_DYNAMIC_RELOCS, false); | |
1013 | gold_assert(this->rel_dyn_->output_section() | |
1014 | == this->rel_irelative_->output_section()); | |
1015 | } | |
1016 | return this->rel_irelative_; | |
1017 | } | |
1018 | ||
57b2284c CC |
1019 | // Write the first three reserved words of the .got.plt section. |
1020 | // The remainder of the section is written while writing the PLT | |
1021 | // in Output_data_plt_i386::do_write. | |
1022 | ||
1023 | void | |
1024 | Output_data_got_plt_i386::do_write(Output_file* of) | |
1025 | { | |
1026 | // The first entry in the GOT is the address of the .dynamic section | |
1027 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1028 | // We saved space for them when we created the section in | |
1029 | // Target_i386::got_section. | |
1030 | const off_t got_file_offset = this->offset(); | |
1031 | gold_assert(this->data_size() >= 12); | |
1032 | unsigned char* const got_view = of->get_output_view(got_file_offset, 12); | |
1033 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1034 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1035 | elfcpp::Swap<32, false>::writeval(got_view, dynamic_addr); | |
1036 | memset(got_view + 4, 0, 8); | |
1037 | of->write_output_view(got_file_offset, 12, got_view); | |
1038 | } | |
1039 | ||
a3ad94ed ILT |
1040 | // Create the PLT section. The ordinary .got section is an argument, |
1041 | // since we need to refer to the start. We also create our own .got | |
1042 | // section just for PLT entries. | |
1043 | ||
67181c72 | 1044 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
2e702c99 | 1045 | uint64_t addralign, |
57b2284c | 1046 | Output_data_got_plt_i386* got_plt, |
67181c72 | 1047 | Output_data_space* got_irelative) |
2e702c99 | 1048 | : Output_section_data(addralign), |
57b2284c CC |
1049 | tls_desc_rel_(NULL), irelative_rel_(NULL), got_plt_(got_plt), |
1050 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
1051 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 1052 | { |
d98bc257 | 1053 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 1054 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
1055 | elfcpp::SHF_ALLOC, this->rel_, |
1056 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
a3ad94ed ILT |
1057 | } |
1058 | ||
16649710 ILT |
1059 | void |
1060 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
1061 | { | |
1062 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
1063 | // linker, and so do we. | |
1064 | os->set_entsize(4); | |
1065 | } | |
1066 | ||
a3ad94ed ILT |
1067 | // Add an entry to the PLT. |
1068 | ||
1069 | void | |
67181c72 ILT |
1070 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
1071 | Symbol* gsym) | |
a3ad94ed ILT |
1072 | { |
1073 | gold_assert(!gsym->has_plt_offset()); | |
1074 | ||
a3ad94ed | 1075 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
1076 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1077 | && gsym->can_use_relative_reloc(false)) | |
1078 | { | |
2e702c99 | 1079 | gsym->set_plt_offset(this->irelative_count_ * this->get_plt_entry_size()); |
67181c72 ILT |
1080 | ++this->irelative_count_; |
1081 | section_offset_type got_offset = | |
1082 | this->got_irelative_->current_data_size(); | |
1083 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
1084 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
1085 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
1086 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1087 | struct Global_ifunc gi; |
1088 | gi.sym = gsym; | |
1089 | gi.got_offset = got_offset; | |
1090 | this->global_ifuncs_.push_back(gi); | |
1091 | } | |
1092 | else | |
1093 | { | |
67181c72 ILT |
1094 | // When setting the PLT offset we skip the initial reserved PLT |
1095 | // entry. | |
2e702c99 | 1096 | gsym->set_plt_offset((this->count_ + 1) * this->get_plt_entry_size()); |
67181c72 ILT |
1097 | |
1098 | ++this->count_; | |
1099 | ||
1100 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
1101 | ||
1102 | // Every PLT entry needs a GOT entry which points back to the | |
1103 | // PLT entry (this will be changed by the dynamic linker, | |
1104 | // normally lazily when the function is called). | |
1105 | this->got_plt_->set_current_data_size(got_offset + 4); | |
1106 | ||
7223e9ca ILT |
1107 | gsym->set_needs_dynsym_entry(); |
1108 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
1109 | got_offset); | |
1110 | } | |
a3ad94ed ILT |
1111 | |
1112 | // Note that we don't need to save the symbol. The contents of the | |
1113 | // PLT are independent of which symbols are used. The symbols only | |
1114 | // appear in the relocations. | |
1115 | } | |
1116 | ||
7223e9ca ILT |
1117 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1118 | // the PLT offset. | |
1119 | ||
1120 | unsigned int | |
6fa2a40b | 1121 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
1122 | Symbol_table* symtab, |
1123 | Layout* layout, | |
6fa2a40b CC |
1124 | Sized_relobj_file<32, false>* relobj, |
1125 | unsigned int local_sym_index) | |
7223e9ca | 1126 | { |
2e702c99 | 1127 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1128 | ++this->irelative_count_; |
7223e9ca | 1129 | |
67181c72 | 1130 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1131 | |
1132 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1133 | // entry. | |
67181c72 | 1134 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
1135 | |
1136 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1137 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
1138 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
1139 | elfcpp::R_386_IRELATIVE, | |
1140 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1141 | |
1142 | struct Local_ifunc li; | |
1143 | li.object = relobj; | |
1144 | li.local_sym_index = local_sym_index; | |
1145 | li.got_offset = got_offset; | |
1146 | this->local_ifuncs_.push_back(li); | |
1147 | ||
1148 | return plt_offset; | |
1149 | } | |
1150 | ||
e291e7b9 ILT |
1151 | // Return where the TLS_DESC relocations should go, creating it if |
1152 | // necessary. These follow the JUMP_SLOT relocations. | |
1153 | ||
1154 | Output_data_plt_i386::Reloc_section* | |
1155 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
1156 | { | |
1157 | if (this->tls_desc_rel_ == NULL) | |
1158 | { | |
1159 | this->tls_desc_rel_ = new Reloc_section(false); | |
1160 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1161 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 1162 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1163 | gold_assert(this->tls_desc_rel_->output_section() |
1164 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1165 | } |
1166 | return this->tls_desc_rel_; | |
1167 | } | |
1168 | ||
67181c72 ILT |
1169 | // Return where the IRELATIVE relocations should go in the PLT. These |
1170 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
1171 | ||
1172 | Output_data_plt_i386::Reloc_section* | |
1173 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
1174 | { | |
1175 | if (this->irelative_rel_ == NULL) | |
1176 | { | |
1177 | // Make sure we have a place for the TLS_DESC relocations, in | |
1178 | // case we see any later on. | |
1179 | this->rel_tls_desc(layout); | |
1180 | this->irelative_rel_ = new Reloc_section(false); | |
1181 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1182 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1183 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1184 | gold_assert(this->irelative_rel_->output_section() | |
1185 | == this->rel_->output_section()); | |
1186 | ||
1187 | if (parameters->doing_static_link()) | |
1188 | { | |
1189 | // A statically linked executable will only have a .rel.plt | |
1190 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
1191 | // symbols. The library will use these symbols to locate | |
1192 | // the IRELATIVE relocs at program startup time. | |
1193 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
1194 | Symbol_table::PREDEFINED, | |
1195 | this->irelative_rel_, 0, 0, | |
1196 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1197 | elfcpp::STV_HIDDEN, 0, false, true); | |
1198 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
1199 | Symbol_table::PREDEFINED, | |
1200 | this->irelative_rel_, 0, 0, | |
1201 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1202 | elfcpp::STV_HIDDEN, 0, true, true); | |
1203 | } | |
1204 | } | |
1205 | return this->irelative_rel_; | |
1206 | } | |
1207 | ||
1208 | // Return the PLT address to use for a global symbol. | |
1209 | ||
1210 | uint64_t | |
1211 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
1212 | { | |
1213 | uint64_t offset = 0; | |
1214 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1215 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1216 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1217 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1218 | } |
1219 | ||
1220 | // Return the PLT address to use for a local symbol. These are always | |
1221 | // IRELATIVE relocs. | |
1222 | ||
1223 | uint64_t | |
19fec8c1 AM |
1224 | Output_data_plt_i386::address_for_local(const Relobj* object, |
1225 | unsigned int r_sym) | |
67181c72 | 1226 | { |
19fec8c1 AM |
1227 | return (this->address() |
1228 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1229 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1230 | } |
1231 | ||
a3ad94ed ILT |
1232 | // The first entry in the PLT for an executable. |
1233 | ||
2e702c99 | 1234 | const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1235 | { |
1236 | 0xff, 0x35, // pushl contents of memory address | |
1237 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1238 | 0xff, 0x25, // jmp indirect | |
1239 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1240 | 0, 0, 0, 0 // unused | |
1241 | }; | |
1242 | ||
2e702c99 RM |
1243 | void |
1244 | Output_data_plt_i386_exec::do_fill_first_plt_entry( | |
1245 | unsigned char* pov, | |
1246 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
1247 | { | |
1248 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1249 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1250 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1251 | } | |
1252 | ||
a3ad94ed ILT |
1253 | // The first entry in the PLT for a shared object. |
1254 | ||
2e702c99 | 1255 | const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1256 | { |
1257 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1258 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1259 | 0, 0, 0, 0 // unused | |
1260 | }; | |
1261 | ||
2e702c99 RM |
1262 | void |
1263 | Output_data_plt_i386_dyn::do_fill_first_plt_entry( | |
1264 | unsigned char* pov, | |
1265 | elfcpp::Elf_types<32>::Elf_Addr) | |
1266 | { | |
1267 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1268 | } | |
1269 | ||
a3ad94ed ILT |
1270 | // Subsequent entries in the PLT for an executable. |
1271 | ||
2e702c99 | 1272 | const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1273 | { |
1274 | 0xff, 0x25, // jmp indirect | |
1275 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1276 | 0x68, // pushl immediate | |
1277 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1278 | 0xe9, // jmp relative | |
1279 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1280 | }; | |
1281 | ||
2e702c99 RM |
1282 | unsigned int |
1283 | Output_data_plt_i386_exec::do_fill_plt_entry( | |
1284 | unsigned char* pov, | |
1285 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
1286 | unsigned int got_offset, | |
1287 | unsigned int plt_offset, | |
1288 | unsigned int plt_rel_offset) | |
1289 | { | |
1290 | memcpy(pov, plt_entry, plt_entry_size); | |
1291 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1292 | got_address + got_offset); | |
1293 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1294 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1295 | return 6; | |
1296 | } | |
1297 | ||
a3ad94ed ILT |
1298 | // Subsequent entries in the PLT for a shared object. |
1299 | ||
2e702c99 | 1300 | const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1301 | { |
1302 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1303 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1304 | 0x68, // pushl immediate | |
1305 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1306 | 0xe9, // jmp relative | |
1307 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1308 | }; | |
1309 | ||
2e702c99 RM |
1310 | unsigned int |
1311 | Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov, | |
1312 | elfcpp::Elf_types<32>::Elf_Addr, | |
1313 | unsigned int got_offset, | |
1314 | unsigned int plt_offset, | |
1315 | unsigned int plt_rel_offset) | |
1316 | { | |
1317 | memcpy(pov, plt_entry, plt_entry_size); | |
1318 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1319 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1320 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1321 | return 6; | |
1322 | } | |
1323 | ||
07a60597 ILT |
1324 | // The .eh_frame unwind information for the PLT. |
1325 | ||
1326 | const unsigned char | |
1327 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1328 | { | |
1329 | 1, // CIE version. | |
1330 | 'z', // Augmentation: augmentation size included. | |
1331 | 'R', // Augmentation: FDE encoding included. | |
1332 | '\0', // End of augmentation string. | |
1333 | 1, // Code alignment factor. | |
1334 | 0x7c, // Data alignment factor. | |
1335 | 8, // Return address column. | |
1336 | 1, // Augmentation size. | |
1337 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1338 | | elfcpp::DW_EH_PE_sdata4), | |
1339 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1340 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1341 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1342 | elfcpp::DW_CFA_nop | |
1343 | }; | |
1344 | ||
1345 | const unsigned char | |
2e702c99 | 1346 | Output_data_plt_i386_standard::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1347 | { |
1348 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1349 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1350 | 0, // Augmentation size. | |
1351 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1352 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1353 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1354 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1355 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1356 | 11, // Block length. | |
1357 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1358 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1359 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1360 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1361 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1362 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1363 | elfcpp::DW_OP_lit2, // Push 2. | |
1364 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1365 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1366 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1367 | elfcpp::DW_CFA_nop, | |
1368 | elfcpp::DW_CFA_nop, | |
1369 | elfcpp::DW_CFA_nop | |
1370 | }; | |
1371 | ||
a3ad94ed ILT |
1372 | // Write out the PLT. This uses the hand-coded instructions above, |
1373 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1374 | // Processor Supplement. | |
1375 | ||
1376 | void | |
1377 | Output_data_plt_i386::do_write(Output_file* of) | |
1378 | { | |
2ea97941 | 1379 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1380 | const section_size_type oview_size = |
1381 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1382 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1383 | |
1384 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1385 | gold_assert(parameters->incremental_update() |
1386 | || (got_file_offset + this->got_plt_->data_size() | |
1387 | == this->got_irelative_->offset())); | |
fe8718a4 | 1388 | const section_size_type got_size = |
67181c72 ILT |
1389 | convert_to_section_size_type(this->got_plt_->data_size() |
1390 | + this->got_irelative_->data_size()); | |
57b2284c | 1391 | |
a3ad94ed ILT |
1392 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1393 | got_size); | |
1394 | ||
1395 | unsigned char* pov = oview; | |
1396 | ||
1397 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1398 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1399 | ||
2e702c99 RM |
1400 | this->fill_first_plt_entry(pov, got_address); |
1401 | pov += this->get_plt_entry_size(); | |
a3ad94ed | 1402 | |
57b2284c CC |
1403 | // The first three entries in the GOT are reserved, and are written |
1404 | // by Output_data_got_plt_i386::do_write. | |
1405 | unsigned char* got_pov = got_view + 12; | |
a3ad94ed ILT |
1406 | |
1407 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1408 | ||
2e702c99 | 1409 | unsigned int plt_offset = this->get_plt_entry_size(); |
a3ad94ed ILT |
1410 | unsigned int plt_rel_offset = 0; |
1411 | unsigned int got_offset = 12; | |
67181c72 | 1412 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1413 | for (unsigned int i = 0; |
1414 | i < count; | |
1415 | ++i, | |
2e702c99 | 1416 | pov += this->get_plt_entry_size(), |
a3ad94ed | 1417 | got_pov += 4, |
2e702c99 | 1418 | plt_offset += this->get_plt_entry_size(), |
a3ad94ed ILT |
1419 | plt_rel_offset += rel_size, |
1420 | got_offset += 4) | |
1421 | { | |
1422 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1423 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1424 | got_address, | |
1425 | got_offset, | |
1426 | plt_offset, | |
1427 | plt_rel_offset); | |
a3ad94ed ILT |
1428 | |
1429 | // Set the entry in the GOT. | |
2e702c99 RM |
1430 | elfcpp::Swap<32, false>::writeval(got_pov, |
1431 | plt_address + plt_offset + lazy_offset); | |
a3ad94ed ILT |
1432 | } |
1433 | ||
7223e9ca ILT |
1434 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1435 | // the GOT to point to the actual symbol value, rather than point to | |
1436 | // the PLT entry. That will let the dynamic linker call the right | |
1437 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1438 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1439 | for (std::vector<Global_ifunc>::const_iterator p = |
1440 | this->global_ifuncs_.begin(); | |
1441 | p != this->global_ifuncs_.end(); | |
1442 | ++p) | |
1443 | { | |
1444 | const Sized_symbol<32>* ssym = | |
1445 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1446 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1447 | ssym->value()); |
1448 | } | |
1449 | ||
1450 | for (std::vector<Local_ifunc>::const_iterator p = | |
1451 | this->local_ifuncs_.begin(); | |
1452 | p != this->local_ifuncs_.end(); | |
1453 | ++p) | |
1454 | { | |
1455 | const Symbol_value<32>* psymval = | |
1456 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1457 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1458 | psymval->value(p->object, 0)); |
1459 | } | |
1460 | ||
fe8718a4 ILT |
1461 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1462 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1463 | |
2ea97941 | 1464 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1465 | of->write_output_view(got_file_offset, got_size, got_view); |
1466 | } | |
1467 | ||
7223e9ca | 1468 | // Create the PLT section. |
a3ad94ed ILT |
1469 | |
1470 | void | |
7223e9ca | 1471 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1472 | { |
a3ad94ed ILT |
1473 | if (this->plt_ == NULL) |
1474 | { | |
1475 | // Create the GOT sections first. | |
7e1edb90 | 1476 | this->got_section(symtab, layout); |
a3ad94ed | 1477 | |
2e702c99 RM |
1478 | const bool dyn = parameters->options().output_is_position_independent(); |
1479 | this->plt_ = this->make_data_plt(layout, | |
1480 | this->got_plt_, | |
1481 | this->got_irelative_, | |
1482 | dyn); | |
1483 | ||
1484 | // Add unwind information if requested. | |
1485 | if (parameters->options().ld_generated_unwind_info()) | |
1486 | this->plt_->add_eh_frame(layout); | |
1487 | ||
16649710 ILT |
1488 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1489 | (elfcpp::SHF_ALLOC | |
1490 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1491 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1492 | |
1493 | // Make the sh_info field of .rel.plt point to .plt. | |
1494 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1495 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1496 | } |
7223e9ca | 1497 | } |
a3ad94ed | 1498 | |
7223e9ca ILT |
1499 | // Create a PLT entry for a global symbol. |
1500 | ||
1501 | void | |
1502 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1503 | { | |
1504 | if (gsym->has_plt_offset()) | |
1505 | return; | |
1506 | if (this->plt_ == NULL) | |
1507 | this->make_plt_section(symtab, layout); | |
67181c72 | 1508 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1509 | } |
1510 | ||
7223e9ca ILT |
1511 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1512 | ||
1513 | void | |
1514 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1515 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1516 | unsigned int local_sym_index) |
1517 | { | |
1518 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1519 | return; | |
1520 | if (this->plt_ == NULL) | |
1521 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1522 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1523 | relobj, | |
7223e9ca ILT |
1524 | local_sym_index); |
1525 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1526 | } | |
1527 | ||
0e70b911 CC |
1528 | // Return the number of entries in the PLT. |
1529 | ||
1530 | unsigned int | |
1531 | Target_i386::plt_entry_count() const | |
1532 | { | |
1533 | if (this->plt_ == NULL) | |
1534 | return 0; | |
1535 | return this->plt_->entry_count(); | |
1536 | } | |
1537 | ||
1538 | // Return the offset of the first non-reserved PLT entry. | |
1539 | ||
1540 | unsigned int | |
1541 | Target_i386::first_plt_entry_offset() const | |
1542 | { | |
2e702c99 | 1543 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1544 | } |
1545 | ||
1546 | // Return the size of each PLT entry. | |
1547 | ||
1548 | unsigned int | |
1549 | Target_i386::plt_entry_size() const | |
1550 | { | |
2e702c99 | 1551 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1552 | } |
1553 | ||
e291e7b9 ILT |
1554 | // Get the section to use for TLS_DESC relocations. |
1555 | ||
1556 | Target_i386::Reloc_section* | |
1557 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1558 | { | |
1559 | return this->plt_section()->rel_tls_desc(layout); | |
1560 | } | |
1561 | ||
9fa33bee | 1562 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1563 | |
1564 | void | |
1565 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1566 | { | |
1567 | if (this->tls_base_symbol_defined_) | |
1568 | return; | |
1569 | ||
1570 | Output_segment* tls_segment = layout->tls_segment(); | |
1571 | if (tls_segment != NULL) | |
1572 | { | |
183fd0e3 | 1573 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1574 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1575 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1576 | tls_segment, 0, 0, |
1577 | elfcpp::STT_TLS, | |
1578 | elfcpp::STB_LOCAL, | |
1579 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1580 | (is_exec |
1581 | ? Symbol::SEGMENT_END | |
1582 | : Symbol::SEGMENT_START), | |
1583 | true); | |
edfbb029 CC |
1584 | } |
1585 | this->tls_base_symbol_defined_ = true; | |
1586 | } | |
1587 | ||
94c4710f ILT |
1588 | // Create a GOT entry for the TLS module index. |
1589 | ||
1590 | unsigned int | |
1591 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2e702c99 | 1592 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1593 | { |
1594 | if (this->got_mod_index_offset_ == -1U) | |
1595 | { | |
1596 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1597 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1598 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1599 | unsigned int got_offset = got->add_constant(0); | |
1600 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
2e702c99 | 1601 | got_offset); |
009a67a2 | 1602 | got->add_constant(0); |
94c4710f ILT |
1603 | this->got_mod_index_offset_ = got_offset; |
1604 | } | |
1605 | return this->got_mod_index_offset_; | |
1606 | } | |
1607 | ||
92e059d8 | 1608 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1609 | // symbol. IS_FINAL is true if the final address of this symbol is |
1610 | // known at link time. | |
92e059d8 | 1611 | |
af6359d5 | 1612 | tls::Tls_optimization |
7e1edb90 | 1613 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1614 | { |
1615 | // If we are generating a shared library, then we can't do anything | |
1616 | // in the linker. | |
8851ecca | 1617 | if (parameters->options().shared()) |
af6359d5 | 1618 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1619 | |
1620 | switch (r_type) | |
1621 | { | |
1622 | case elfcpp::R_386_TLS_GD: | |
1623 | case elfcpp::R_386_TLS_GOTDESC: | |
1624 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1625 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1626 | // access. Since we know that we are generating an executable, |
1627 | // we can convert this to Initial-Exec. If we also know that | |
1628 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1629 | if (is_final) |
af6359d5 ILT |
1630 | return tls::TLSOPT_TO_LE; |
1631 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1632 | |
1633 | case elfcpp::R_386_TLS_LDM: | |
1634 | // This is Local-Dynamic, which refers to a local symbol in the | |
1635 | // dynamic TLS block. Since we know that we generating an | |
1636 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1637 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1638 | |
1639 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1640 | // Another type of Local-Dynamic relocation. |
1641 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1642 | |
1643 | case elfcpp::R_386_TLS_IE: | |
1644 | case elfcpp::R_386_TLS_GOTIE: | |
1645 | case elfcpp::R_386_TLS_IE_32: | |
1646 | // These are Initial-Exec relocs which get the thread offset | |
1647 | // from the GOT. If we know that we are linking against the | |
1648 | // local symbol, we can switch to Local-Exec, which links the | |
1649 | // thread offset into the instruction. | |
a3ad94ed | 1650 | if (is_final) |
af6359d5 ILT |
1651 | return tls::TLSOPT_TO_LE; |
1652 | return tls::TLSOPT_NONE; | |
8462ae85 | 1653 | |
92e059d8 ILT |
1654 | case elfcpp::R_386_TLS_LE: |
1655 | case elfcpp::R_386_TLS_LE_32: | |
1656 | // When we already have Local-Exec, there is nothing further we | |
1657 | // can do. | |
af6359d5 | 1658 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1659 | |
1660 | default: | |
a3ad94ed | 1661 | gold_unreachable(); |
92e059d8 ILT |
1662 | } |
1663 | } | |
1664 | ||
95a2c8d6 | 1665 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1666 | |
95a2c8d6 RS |
1667 | int |
1668 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1669 | { |
1670 | switch (r_type) | |
1671 | { | |
1672 | case elfcpp::R_386_NONE: | |
1673 | case elfcpp::R_386_GNU_VTINHERIT: | |
1674 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1675 | case elfcpp::R_386_GOTPC: |
1676 | // No symbol reference. | |
1677 | return 0; | |
7223e9ca ILT |
1678 | |
1679 | case elfcpp::R_386_32: | |
1680 | case elfcpp::R_386_16: | |
1681 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1682 | return Symbol::ABSOLUTE_REF; |
1683 | ||
7223e9ca ILT |
1684 | case elfcpp::R_386_PC32: |
1685 | case elfcpp::R_386_PC16: | |
1686 | case elfcpp::R_386_PC8: | |
7223e9ca | 1687 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1688 | return Symbol::RELATIVE_REF; |
1689 | ||
1690 | case elfcpp::R_386_PLT32: | |
1691 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1692 | ||
7223e9ca | 1693 | case elfcpp::R_386_GOT32: |
493d4b48 | 1694 | case elfcpp::R_386_GOT32X: |
95a2c8d6 RS |
1695 | // Absolute in GOT. |
1696 | return Symbol::ABSOLUTE_REF; | |
1697 | ||
1698 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1699 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1700 | case elfcpp::R_386_TLS_DESC_CALL: | |
1701 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1702 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1703 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1704 | case elfcpp::R_386_TLS_IE_32: | |
1705 | case elfcpp::R_386_TLS_GOTIE: | |
1706 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1707 | case elfcpp::R_386_TLS_LE_32: | |
1708 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1709 | |
1710 | case elfcpp::R_386_COPY: | |
1711 | case elfcpp::R_386_GLOB_DAT: | |
1712 | case elfcpp::R_386_JUMP_SLOT: | |
1713 | case elfcpp::R_386_RELATIVE: | |
1714 | case elfcpp::R_386_IRELATIVE: | |
1715 | case elfcpp::R_386_TLS_TPOFF: | |
1716 | case elfcpp::R_386_TLS_DTPMOD32: | |
1717 | case elfcpp::R_386_TLS_DTPOFF32: | |
1718 | case elfcpp::R_386_TLS_TPOFF32: | |
1719 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1720 | case elfcpp::R_386_32PLT: |
1721 | case elfcpp::R_386_TLS_GD_32: | |
1722 | case elfcpp::R_386_TLS_GD_PUSH: | |
1723 | case elfcpp::R_386_TLS_GD_CALL: | |
1724 | case elfcpp::R_386_TLS_GD_POP: | |
1725 | case elfcpp::R_386_TLS_LDM_32: | |
1726 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1727 | case elfcpp::R_386_TLS_LDM_CALL: | |
1728 | case elfcpp::R_386_TLS_LDM_POP: | |
1729 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1730 | default: | |
95a2c8d6 RS |
1731 | // Not expected. We will give an error later. |
1732 | return 0; | |
7223e9ca ILT |
1733 | } |
1734 | } | |
1735 | ||
95a2c8d6 RS |
1736 | // Report an unsupported relocation against a local symbol. |
1737 | ||
1738 | void | |
6fa2a40b | 1739 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1740 | unsigned int r_type) |
1741 | { | |
1742 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1743 | object->name().c_str(), r_type); | |
1744 | } | |
1745 | ||
1746 | // Return whether we need to make a PLT entry for a relocation of a | |
1747 | // given type against a STT_GNU_IFUNC symbol. | |
1748 | ||
1749 | bool | |
6fa2a40b CC |
1750 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1751 | Sized_relobj_file<32, false>* object, | |
1752 | unsigned int r_type) | |
95a2c8d6 RS |
1753 | { |
1754 | int flags = Scan::get_reference_flags(r_type); | |
1755 | if (flags & Symbol::TLS_REF) | |
1756 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 1757 | object->name().c_str(), r_type); |
95a2c8d6 RS |
1758 | return flags != 0; |
1759 | } | |
1760 | ||
92e059d8 ILT |
1761 | // Scan a relocation for a local symbol. |
1762 | ||
1763 | inline void | |
ad0f2072 | 1764 | Target_i386::Scan::local(Symbol_table* symtab, |
bfdfa4cd AM |
1765 | Layout* layout, |
1766 | Target_i386* target, | |
1767 | Sized_relobj_file<32, false>* object, | |
1768 | unsigned int data_shndx, | |
1769 | Output_section* output_section, | |
1770 | const elfcpp::Rel<32, false>& reloc, | |
1771 | unsigned int r_type, | |
1772 | const elfcpp::Sym<32, false>& lsym, | |
1773 | bool is_discarded) | |
92e059d8 | 1774 | { |
bfdfa4cd AM |
1775 | if (is_discarded) |
1776 | return; | |
1777 | ||
7223e9ca ILT |
1778 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1779 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1780 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1781 | { | |
1782 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1783 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1784 | } | |
1785 | ||
92e059d8 ILT |
1786 | switch (r_type) |
1787 | { | |
1788 | case elfcpp::R_386_NONE: | |
1789 | case elfcpp::R_386_GNU_VTINHERIT: | |
1790 | case elfcpp::R_386_GNU_VTENTRY: | |
1791 | break; | |
1792 | ||
1793 | case elfcpp::R_386_32: | |
436ca963 ILT |
1794 | // If building a shared library (or a position-independent |
1795 | // executable), we need to create a dynamic relocation for | |
1796 | // this location. The relocation applied at link time will | |
1797 | // apply the link-time value, so we flag the location with | |
1798 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1799 | // relocate it easily. | |
8851ecca | 1800 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1801 | { |
1802 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1803 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1804 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1805 | output_section, data_shndx, | |
1806 | reloc.get_r_offset()); | |
2e702c99 | 1807 | } |
d61c6bd4 ILT |
1808 | break; |
1809 | ||
1810 | case elfcpp::R_386_16: | |
1811 | case elfcpp::R_386_8: | |
1812 | // If building a shared library (or a position-independent | |
1813 | // executable), we need to create a dynamic relocation for | |
1814 | // this location. Because the addend needs to remain in the | |
1815 | // data section, we need to be careful not to apply this | |
1816 | // relocation statically. | |
8851ecca | 1817 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1818 | { |
1819 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1820 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
2e702c99 | 1821 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1822 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1823 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1824 | else |
1825 | { | |
1826 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1827 | unsigned int shndx = lsym.get_st_shndx(); |
1828 | bool is_ordinary; | |
1829 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1830 | &is_ordinary); | |
1831 | if (!is_ordinary) | |
1832 | object->error(_("section symbol %u has bad shndx %u"), | |
1833 | r_sym, shndx); | |
1834 | else | |
1835 | rel_dyn->add_local_section(object, shndx, | |
1836 | r_type, output_section, | |
1837 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1838 | } |
1839 | } | |
92e059d8 ILT |
1840 | break; |
1841 | ||
1842 | case elfcpp::R_386_PC32: | |
1843 | case elfcpp::R_386_PC16: | |
1844 | case elfcpp::R_386_PC8: | |
1845 | break; | |
1846 | ||
df2efe71 ILT |
1847 | case elfcpp::R_386_PLT32: |
1848 | // Since we know this is a local symbol, we can handle this as a | |
1849 | // PC32 reloc. | |
1850 | break; | |
1851 | ||
ead1e424 ILT |
1852 | case elfcpp::R_386_GOTOFF: |
1853 | case elfcpp::R_386_GOTPC: | |
1854 | // We need a GOT section. | |
7e1edb90 | 1855 | target->got_section(symtab, layout); |
ead1e424 ILT |
1856 | break; |
1857 | ||
1b64748b | 1858 | case elfcpp::R_386_GOT32: |
493d4b48 | 1859 | case elfcpp::R_386_GOT32X: |
1b64748b | 1860 | { |
c4fc4724 | 1861 | // We need GOT section. |
2e702c99 | 1862 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
1863 | |
1864 | // If the relocation symbol isn't IFUNC, | |
1865 | // and is local, then we will convert | |
1866 | // mov foo@GOT(%reg), %reg | |
1867 | // to | |
1868 | // lea foo@GOTOFF(%reg), %reg | |
1869 | // in Relocate::relocate. | |
1870 | if (reloc.get_r_offset() >= 2 | |
1871 | && lsym.get_st_type() != elfcpp::STT_GNU_IFUNC) | |
1872 | { | |
1873 | section_size_type stype; | |
1874 | const unsigned char* view = object->section_contents(data_shndx, | |
1875 | &stype, true); | |
1876 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
1877 | break; | |
1878 | } | |
1879 | ||
1880 | // Otherwise, the symbol requires a GOT entry. | |
2e702c99 | 1881 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1882 | |
1883 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1884 | // lets function pointers compare correctly with shared | |
1885 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1886 | bool is_new; | |
1887 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1888 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1889 | else | |
1890 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
1891 | if (is_new) |
1892 | { | |
1893 | // If we are generating a shared object, we need to add a | |
1894 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
1895 | if (parameters->options().output_is_position_independent()) | |
1896 | { | |
1897 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1898 | unsigned int got_offset = |
1899 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1900 | rel_dyn->add_local_relative(object, r_sym, | |
1901 | elfcpp::R_386_RELATIVE, | |
1902 | got, got_offset); | |
2e702c99 RM |
1903 | } |
1904 | } | |
1b64748b ILT |
1905 | } |
1906 | break; | |
1907 | ||
af6359d5 ILT |
1908 | // These are relocations which should only be seen by the |
1909 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1910 | case elfcpp::R_386_COPY: |
1911 | case elfcpp::R_386_GLOB_DAT: | |
1912 | case elfcpp::R_386_JUMP_SLOT: | |
1913 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1914 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1915 | case elfcpp::R_386_TLS_TPOFF: |
1916 | case elfcpp::R_386_TLS_DTPMOD32: | |
1917 | case elfcpp::R_386_TLS_DTPOFF32: | |
1918 | case elfcpp::R_386_TLS_TPOFF32: | |
1919 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1920 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1921 | object->name().c_str(), r_type); |
92e059d8 ILT |
1922 | break; |
1923 | ||
af6359d5 | 1924 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1925 | // linking. |
56622147 ILT |
1926 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1927 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1928 | case elfcpp::R_386_TLS_DESC_CALL: | |
1929 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1930 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1931 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1932 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1933 | case elfcpp::R_386_TLS_GOTIE: |
1934 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1935 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1936 | { |
8851ecca | 1937 | bool output_is_shared = parameters->options().shared(); |
af6359d5 | 1938 | const tls::Tls_optimization optimized_type |
2e702c99 | 1939 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); |
7e1edb90 ILT |
1940 | switch (r_type) |
1941 | { | |
56622147 | 1942 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1943 | if (optimized_type == tls::TLSOPT_NONE) |
1944 | { | |
2e702c99 RM |
1945 | // Create a pair of GOT entries for the module index and |
1946 | // dtv-relative offset. | |
1947 | Output_data_got<32, false>* got | |
1948 | = target->got_section(symtab, layout); | |
1949 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1950 | unsigned int shndx = lsym.get_st_shndx(); |
1951 | bool is_ordinary; | |
1952 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1953 | if (!is_ordinary) | |
1954 | object->error(_("local symbol %u has bad shndx %u"), | |
1955 | r_sym, shndx); | |
2e702c99 | 1956 | else |
d491d34e ILT |
1957 | got->add_local_pair_with_rel(object, r_sym, shndx, |
1958 | GOT_TYPE_TLS_PAIR, | |
1959 | target->rel_dyn_section(layout), | |
bd73a62d | 1960 | elfcpp::R_386_TLS_DTPMOD32); |
07f397ab ILT |
1961 | } |
1962 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1963 | unsupported_reloc_local(object, r_type); | |
1964 | break; | |
1965 | ||
56622147 | 1966 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1967 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
1968 | if (optimized_type == tls::TLSOPT_NONE) |
1969 | { | |
1970 | // Create a double GOT entry with an R_386_TLS_DESC | |
1971 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1972 | // lazily, so the GOT entry needs to be in an area in | |
1973 | // .got.plt, not .got. Call got_section to make sure | |
1974 | // the section has been created. | |
a8df5856 | 1975 | target->got_section(symtab, layout); |
2e702c99 RM |
1976 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
1977 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
1978 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1979 | { | |
1980 | unsigned int got_offset = got->add_constant(0); | |
1981 | // The local symbol value is stored in the second | |
1982 | // GOT entry. | |
1983 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1984 | // That set the GOT offset of the local symbol to | |
1985 | // point to the second entry, but we want it to | |
1986 | // point to the first. | |
1987 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1988 | got_offset); | |
1989 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1990 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1991 | } | |
2e702c99 RM |
1992 | } |
1993 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1994 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1995 | break; |
1996 | ||
c2b45e22 CC |
1997 | case elfcpp::R_386_TLS_DESC_CALL: |
1998 | break; | |
1999 | ||
56622147 | 2000 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2001 | if (optimized_type == tls::TLSOPT_NONE) |
2002 | { | |
2e702c99 RM |
2003 | // Create a GOT entry for the module index. |
2004 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2005 | } |
2006 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2007 | unsupported_reloc_local(object, r_type); |
2008 | break; | |
2009 | ||
56622147 | 2010 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2011 | break; |
2012 | ||
56622147 ILT |
2013 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2014 | case elfcpp::R_386_TLS_IE_32: | |
2015 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2016 | layout->set_has_static_tls(); |
07f397ab ILT |
2017 | if (optimized_type == tls::TLSOPT_NONE) |
2018 | { | |
2e702c99 RM |
2019 | // For the R_386_TLS_IE relocation, we need to create a |
2020 | // dynamic relocation when building a shared library. | |
2021 | if (r_type == elfcpp::R_386_TLS_IE | |
2022 | && parameters->options().shared()) | |
2023 | { | |
2024 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2025 | unsigned int r_sym | |
2026 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2027 | rel_dyn->add_local_relative(object, r_sym, | |
2028 | elfcpp::R_386_RELATIVE, | |
2029 | output_section, data_shndx, | |
2030 | reloc.get_r_offset()); | |
2031 | } | |
2032 | // Create a GOT entry for the tp-relative offset. | |
2033 | Output_data_got<32, false>* got | |
2034 | = target->got_section(symtab, layout); | |
2035 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2036 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2037 | ? elfcpp::R_386_TLS_TPOFF32 | |
2038 | : elfcpp::R_386_TLS_TPOFF); | |
2039 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2040 | ? GOT_TYPE_TLS_OFFSET | |
2041 | : GOT_TYPE_TLS_NOFFSET); | |
2042 | got->add_local_with_rel(object, r_sym, got_type, | |
2043 | target->rel_dyn_section(layout), | |
2044 | dyn_r_type); | |
07f397ab ILT |
2045 | } |
2046 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2047 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 2048 | break; |
af6359d5 | 2049 | |
56622147 ILT |
2050 | case elfcpp::R_386_TLS_LE: // Local-exec |
2051 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2052 | layout->set_has_static_tls(); |
07f397ab | 2053 | if (output_is_shared) |
7bf1f802 | 2054 | { |
2e702c99 RM |
2055 | // We need to create a dynamic relocation. |
2056 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2057 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2058 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2059 | ? elfcpp::R_386_TLS_TPOFF32 | |
2060 | : elfcpp::R_386_TLS_TPOFF); | |
2061 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2062 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
2063 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2064 | } |
56622147 ILT |
2065 | break; |
2066 | ||
af6359d5 ILT |
2067 | default: |
2068 | gold_unreachable(); | |
7e1edb90 ILT |
2069 | } |
2070 | } | |
92e059d8 ILT |
2071 | break; |
2072 | ||
92e059d8 ILT |
2073 | case elfcpp::R_386_32PLT: |
2074 | case elfcpp::R_386_TLS_GD_32: | |
2075 | case elfcpp::R_386_TLS_GD_PUSH: | |
2076 | case elfcpp::R_386_TLS_GD_CALL: | |
2077 | case elfcpp::R_386_TLS_GD_POP: | |
2078 | case elfcpp::R_386_TLS_LDM_32: | |
2079 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2080 | case elfcpp::R_386_TLS_LDM_CALL: | |
2081 | case elfcpp::R_386_TLS_LDM_POP: | |
2082 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2083 | default: | |
af6359d5 | 2084 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
2085 | break; |
2086 | } | |
2087 | } | |
2088 | ||
af6359d5 ILT |
2089 | // Report an unsupported relocation against a global symbol. |
2090 | ||
2091 | void | |
6fa2a40b CC |
2092 | Target_i386::Scan::unsupported_reloc_global( |
2093 | Sized_relobj_file<32, false>* object, | |
2094 | unsigned int r_type, | |
2095 | Symbol* gsym) | |
af6359d5 | 2096 | { |
75f2446e | 2097 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2098 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
2099 | } |
2100 | ||
0897ed3b ST |
2101 | inline bool |
2102 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
2103 | { | |
2104 | switch (r_type) | |
2105 | { | |
2106 | case elfcpp::R_386_32: | |
2107 | case elfcpp::R_386_16: | |
2108 | case elfcpp::R_386_8: | |
2109 | case elfcpp::R_386_GOTOFF: | |
2110 | case elfcpp::R_386_GOT32: | |
493d4b48 | 2111 | case elfcpp::R_386_GOT32X: |
0897ed3b | 2112 | { |
2e702c99 | 2113 | return true; |
0897ed3b ST |
2114 | } |
2115 | default: | |
2116 | return false; | |
2117 | } | |
2118 | return false; | |
2119 | } | |
2120 | ||
2121 | inline bool | |
2122 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
2123 | Symbol_table* , | |
2124 | Layout* , | |
2125 | Target_i386* , | |
6fa2a40b | 2126 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2127 | unsigned int , |
2128 | Output_section* , | |
2129 | const elfcpp::Rel<32, false>& , | |
2130 | unsigned int r_type, | |
2131 | const elfcpp::Sym<32, false>&) | |
2132 | { | |
2133 | return possible_function_pointer_reloc(r_type); | |
2134 | } | |
2135 | ||
2136 | inline bool | |
2137 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
2138 | Symbol_table* , | |
2139 | Layout* , | |
2140 | Target_i386* , | |
6fa2a40b | 2141 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2142 | unsigned int , |
2143 | Output_section* , | |
2144 | const elfcpp::Rel<32, false>& , | |
2145 | unsigned int r_type, | |
2146 | Symbol*) | |
2147 | { | |
2148 | return possible_function_pointer_reloc(r_type); | |
2149 | } | |
2150 | ||
92e059d8 ILT |
2151 | // Scan a relocation for a global symbol. |
2152 | ||
2153 | inline void | |
ad0f2072 | 2154 | Target_i386::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2155 | Layout* layout, |
2156 | Target_i386* target, | |
2157 | Sized_relobj_file<32, false>* object, | |
2158 | unsigned int data_shndx, | |
2159 | Output_section* output_section, | |
2160 | const elfcpp::Rel<32, false>& reloc, | |
2161 | unsigned int r_type, | |
2162 | Symbol* gsym) | |
92e059d8 | 2163 | { |
7223e9ca ILT |
2164 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2165 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2166 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2167 | target->make_plt_entry(symtab, layout, gsym); | |
2168 | ||
92e059d8 ILT |
2169 | switch (r_type) |
2170 | { | |
2171 | case elfcpp::R_386_NONE: | |
2172 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 2173 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
2174 | break; |
2175 | ||
2176 | case elfcpp::R_386_32: | |
92e059d8 | 2177 | case elfcpp::R_386_16: |
92e059d8 | 2178 | case elfcpp::R_386_8: |
96f2030e | 2179 | { |
2e702c99 RM |
2180 | // Make a PLT entry if necessary. |
2181 | if (gsym->needs_plt_entry()) | |
2182 | { | |
2183 | target->make_plt_entry(symtab, layout, gsym); | |
2184 | // Since this is not a PC-relative relocation, we may be | |
2185 | // taking the address of a function. In that case we need to | |
2186 | // set the entry in the dynamic symbol table to the address of | |
2187 | // the PLT entry. | |
2188 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2189 | gsym->set_needs_dynsym_value(); | |
2190 | } | |
2191 | // Make a dynamic relocation if necessary. | |
2192 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2193 | { | |
a82bef93 ST |
2194 | if (!parameters->options().output_is_position_independent() |
2195 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2196 | { |
2197 | target->copy_reloc(symtab, layout, object, | |
2198 | data_shndx, output_section, gsym, reloc); | |
2199 | } | |
7223e9ca ILT |
2200 | else if (r_type == elfcpp::R_386_32 |
2201 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2202 | && gsym->can_use_relative_reloc(false) | |
2203 | && !gsym->is_from_dynobj() | |
2204 | && !gsym->is_undefined() | |
2205 | && !gsym->is_preemptible()) | |
2206 | { | |
2207 | // Use an IRELATIVE reloc for a locally defined | |
2208 | // STT_GNU_IFUNC symbol. This makes a function | |
2209 | // address in a PIE executable match the address in a | |
2210 | // shared library that it links against. | |
67181c72 | 2211 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
2212 | rel_dyn->add_symbolless_global_addend(gsym, |
2213 | elfcpp::R_386_IRELATIVE, | |
2214 | output_section, | |
2215 | object, data_shndx, | |
2216 | reloc.get_r_offset()); | |
2217 | } | |
2e702c99 RM |
2218 | else if (r_type == elfcpp::R_386_32 |
2219 | && gsym->can_use_relative_reloc(false)) | |
2220 | { | |
2221 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
2222 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2223 | output_section, object, | |
2224 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
2225 | } |
2226 | else | |
2227 | { | |
2228 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2229 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2230 | data_shndx, reloc.get_r_offset()); | |
2231 | } | |
2232 | } | |
d61c6bd4 ILT |
2233 | } |
2234 | break; | |
2235 | ||
2236 | case elfcpp::R_386_PC32: | |
2237 | case elfcpp::R_386_PC16: | |
2238 | case elfcpp::R_386_PC8: | |
2239 | { | |
2e702c99 RM |
2240 | // Make a PLT entry if necessary. |
2241 | if (gsym->needs_plt_entry()) | |
2242 | { | |
2243 | // These relocations are used for function calls only in | |
2244 | // non-PIC code. For a 32-bit relocation in a shared library, | |
2245 | // we'll need a text relocation anyway, so we can skip the | |
2246 | // PLT entry and let the dynamic linker bind the call directly | |
2247 | // to the target. For smaller relocations, we should use a | |
2248 | // PLT entry to ensure that the call can reach. | |
2249 | if (!parameters->options().shared() | |
2250 | || r_type != elfcpp::R_386_PC32) | |
2251 | target->make_plt_entry(symtab, layout, gsym); | |
2252 | } | |
2253 | // Make a dynamic relocation if necessary. | |
2254 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2255 | { | |
a82bef93 ST |
2256 | if (parameters->options().output_is_executable() |
2257 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2258 | { |
2259 | target->copy_reloc(symtab, layout, object, | |
2260 | data_shndx, output_section, gsym, reloc); | |
2261 | } | |
2262 | else | |
2263 | { | |
2264 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2265 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2266 | data_shndx, reloc.get_r_offset()); | |
2267 | } | |
2268 | } | |
96f2030e | 2269 | } |
92e059d8 ILT |
2270 | break; |
2271 | ||
ead1e424 | 2272 | case elfcpp::R_386_GOT32: |
493d4b48 | 2273 | case elfcpp::R_386_GOT32X: |
8462ae85 | 2274 | { |
c4fc4724 | 2275 | // The symbol requires a GOT section. |
2e702c99 | 2276 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
2277 | |
2278 | // If we convert this from | |
2279 | // mov foo@GOT(%reg), %reg | |
2280 | // to | |
2281 | // lea foo@GOTOFF(%reg), %reg | |
2282 | // in Relocate::relocate, then there is nothing to do here. | |
2283 | if (reloc.get_r_offset() >= 2 | |
2284 | && Target_i386::can_convert_mov_to_lea(gsym)) | |
2285 | { | |
2286 | section_size_type stype; | |
2287 | const unsigned char* view = object->section_contents(data_shndx, | |
2288 | &stype, true); | |
2289 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
2290 | break; | |
2291 | } | |
2292 | ||
2e702c99 | 2293 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2294 | { |
2295 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2296 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2297 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2298 | else | |
2299 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2300 | } | |
2e702c99 RM |
2301 | else |
2302 | { | |
2303 | // If this symbol is not fully resolved, we need to add a | |
2304 | // GOT entry with a dynamic relocation. | |
2305 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2306 | |
2307 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2308 | // | |
2309 | // 1) The symbol may be defined in some other module. | |
2310 | // | |
2311 | // 2) We are building a shared library and this is a | |
2312 | // protected symbol; using GLOB_DAT means that the dynamic | |
2313 | // linker can use the address of the PLT in the main | |
2314 | // executable when appropriate so that function address | |
2315 | // comparisons work. | |
2316 | // | |
2317 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2318 | // code, again so that function address comparisons work. | |
2e702c99 RM |
2319 | if (gsym->is_from_dynobj() |
2320 | || gsym->is_undefined() | |
2321 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2322 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2323 | && parameters->options().shared()) | |
7223e9ca ILT |
2324 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2325 | && parameters->options().output_is_position_independent())) | |
2e702c99 RM |
2326 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2327 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
2328 | else | |
2329 | { | |
7223e9ca ILT |
2330 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2331 | // offset into the GOT, so that function pointer | |
2332 | // comparisons work correctly. | |
2333 | bool is_new; | |
2334 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2335 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2336 | else | |
2337 | { | |
2338 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2339 | // Tell the dynamic linker to use the PLT address | |
2340 | // when resolving relocations. | |
2341 | if (gsym->is_from_dynobj() | |
2342 | && !parameters->options().shared()) | |
2343 | gsym->set_needs_dynsym_value(); | |
2344 | } | |
2e702c99 | 2345 | if (is_new) |
7223e9ca ILT |
2346 | { |
2347 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2348 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2349 | got, got_off); | |
2350 | } | |
2e702c99 RM |
2351 | } |
2352 | } | |
8462ae85 | 2353 | } |
ead1e424 ILT |
2354 | break; |
2355 | ||
2356 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2357 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2358 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2359 | if (gsym->final_value_is_known()) |
ead1e424 | 2360 | break; |
436ca963 ILT |
2361 | // If building a shared library, we can also skip the PLT entry |
2362 | // if the symbol is defined in the output file and is protected | |
2363 | // or hidden. | |
2364 | if (gsym->is_defined() | |
2e702c99 RM |
2365 | && !gsym->is_from_dynobj() |
2366 | && !gsym->is_preemptible()) | |
436ca963 | 2367 | break; |
7e1edb90 | 2368 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2369 | break; |
2370 | ||
2371 | case elfcpp::R_386_GOTOFF: | |
2372 | case elfcpp::R_386_GOTPC: | |
2373 | // We need a GOT section. | |
7e1edb90 | 2374 | target->got_section(symtab, layout); |
ead1e424 ILT |
2375 | break; |
2376 | ||
af6359d5 ILT |
2377 | // These are relocations which should only be seen by the |
2378 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2379 | case elfcpp::R_386_COPY: |
2380 | case elfcpp::R_386_GLOB_DAT: | |
2381 | case elfcpp::R_386_JUMP_SLOT: | |
2382 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2383 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2384 | case elfcpp::R_386_TLS_TPOFF: |
2385 | case elfcpp::R_386_TLS_DTPMOD32: | |
2386 | case elfcpp::R_386_TLS_DTPOFF32: | |
2387 | case elfcpp::R_386_TLS_TPOFF32: | |
2388 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2389 | gold_error(_("%s: unexpected reloc %u in object file"), |
2390 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2391 | break; |
2392 | ||
d61c17ea ILT |
2393 | // These are initial tls relocs, which are expected when |
2394 | // linking. | |
56622147 ILT |
2395 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2396 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2397 | case elfcpp::R_386_TLS_DESC_CALL: | |
2398 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2399 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2400 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2401 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2402 | case elfcpp::R_386_TLS_GOTIE: |
2403 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2404 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2405 | { |
7e1edb90 | 2406 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 | 2407 | const tls::Tls_optimization optimized_type |
2e702c99 | 2408 | = Target_i386::optimize_tls_reloc(is_final, r_type); |
a3ad94ed ILT |
2409 | switch (r_type) |
2410 | { | |
56622147 | 2411 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2412 | if (optimized_type == tls::TLSOPT_NONE) |
2413 | { | |
2e702c99 RM |
2414 | // Create a pair of GOT entries for the module index and |
2415 | // dtv-relative offset. | |
2416 | Output_data_got<32, false>* got | |
2417 | = target->got_section(symtab, layout); | |
2418 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
2419 | target->rel_dyn_section(layout), | |
2420 | elfcpp::R_386_TLS_DTPMOD32, | |
2421 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2422 | } |
2423 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2424 | { | |
2e702c99 RM |
2425 | // Create a GOT entry for the tp-relative offset. |
2426 | Output_data_got<32, false>* got | |
2427 | = target->got_section(symtab, layout); | |
2428 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2429 | target->rel_dyn_section(layout), | |
2430 | elfcpp::R_386_TLS_TPOFF); | |
07f397ab ILT |
2431 | } |
2432 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2433 | unsupported_reloc_global(object, r_type, gsym); | |
2434 | break; | |
2435 | ||
56622147 | 2436 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2437 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
2438 | if (optimized_type == tls::TLSOPT_NONE) |
2439 | { | |
2440 | // Create a double GOT entry with an R_386_TLS_DESC | |
2441 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2442 | // lazily, so the GOT entry needs to be in an area in | |
2443 | // .got.plt, not .got. Call got_section to make sure | |
2444 | // the section has been created. | |
a8df5856 | 2445 | target->got_section(symtab, layout); |
2e702c99 | 2446 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
e291e7b9 | 2447 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2e702c99 RM |
2448 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2449 | elfcpp::R_386_TLS_DESC, 0); | |
2450 | } | |
2451 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2452 | { | |
2453 | // Create a GOT entry for the tp-relative offset. | |
2454 | Output_data_got<32, false>* got | |
2455 | = target->got_section(symtab, layout); | |
2456 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2457 | target->rel_dyn_section(layout), | |
2458 | elfcpp::R_386_TLS_TPOFF); | |
2459 | } | |
2460 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2461 | unsupported_reloc_global(object, r_type, gsym); | |
c2b45e22 CC |
2462 | break; |
2463 | ||
2464 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2465 | break; |
2466 | ||
56622147 | 2467 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2468 | if (optimized_type == tls::TLSOPT_NONE) |
2469 | { | |
2e702c99 RM |
2470 | // Create a GOT entry for the module index. |
2471 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2472 | } |
2473 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2474 | unsupported_reloc_global(object, r_type, gsym); |
2475 | break; | |
2476 | ||
56622147 | 2477 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2478 | break; |
2479 | ||
56622147 ILT |
2480 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2481 | case elfcpp::R_386_TLS_IE_32: | |
2482 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2483 | layout->set_has_static_tls(); |
07f397ab ILT |
2484 | if (optimized_type == tls::TLSOPT_NONE) |
2485 | { | |
2e702c99 RM |
2486 | // For the R_386_TLS_IE relocation, we need to create a |
2487 | // dynamic relocation when building a shared library. | |
2488 | if (r_type == elfcpp::R_386_TLS_IE | |
2489 | && parameters->options().shared()) | |
2490 | { | |
2491 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2492 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2493 | output_section, object, | |
2494 | data_shndx, | |
2495 | reloc.get_r_offset()); | |
2496 | } | |
2497 | // Create a GOT entry for the tp-relative offset. | |
2498 | Output_data_got<32, false>* got | |
2499 | = target->got_section(symtab, layout); | |
2500 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2501 | ? elfcpp::R_386_TLS_TPOFF32 | |
2502 | : elfcpp::R_386_TLS_TPOFF); | |
2503 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2504 | ? GOT_TYPE_TLS_OFFSET | |
2505 | : GOT_TYPE_TLS_NOFFSET); | |
2506 | got->add_global_with_rel(gsym, got_type, | |
2507 | target->rel_dyn_section(layout), | |
2508 | dyn_r_type); | |
07f397ab ILT |
2509 | } |
2510 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2511 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2512 | break; |
af6359d5 | 2513 | |
56622147 ILT |
2514 | case elfcpp::R_386_TLS_LE: // Local-exec |
2515 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2516 | layout->set_has_static_tls(); |
8851ecca | 2517 | if (parameters->options().shared()) |
7bf1f802 | 2518 | { |
2e702c99 RM |
2519 | // We need to create a dynamic relocation. |
2520 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2521 | ? elfcpp::R_386_TLS_TPOFF32 | |
2522 | : elfcpp::R_386_TLS_TPOFF); | |
2523 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2524 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2525 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2526 | } |
56622147 ILT |
2527 | break; |
2528 | ||
af6359d5 ILT |
2529 | default: |
2530 | gold_unreachable(); | |
a3ad94ed ILT |
2531 | } |
2532 | } | |
92e059d8 ILT |
2533 | break; |
2534 | ||
92e059d8 ILT |
2535 | case elfcpp::R_386_32PLT: |
2536 | case elfcpp::R_386_TLS_GD_32: | |
2537 | case elfcpp::R_386_TLS_GD_PUSH: | |
2538 | case elfcpp::R_386_TLS_GD_CALL: | |
2539 | case elfcpp::R_386_TLS_GD_POP: | |
2540 | case elfcpp::R_386_TLS_LDM_32: | |
2541 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2542 | case elfcpp::R_386_TLS_LDM_CALL: | |
2543 | case elfcpp::R_386_TLS_LDM_POP: | |
2544 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2545 | default: | |
af6359d5 | 2546 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2547 | break; |
2548 | } | |
2549 | } | |
2550 | ||
6d03d481 ST |
2551 | // Process relocations for gc. |
2552 | ||
2553 | void | |
ad0f2072 | 2554 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
2555 | Layout* layout, |
2556 | Sized_relobj_file<32, false>* object, | |
2557 | unsigned int data_shndx, | |
2558 | unsigned int, | |
2559 | const unsigned char* prelocs, | |
2560 | size_t reloc_count, | |
2561 | Output_section* output_section, | |
2562 | bool needs_special_offset_handling, | |
2563 | size_t local_symbol_count, | |
2564 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
2565 | { |
2566 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
2e702c99 RM |
2567 | Target_i386::Scan, |
2568 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2569 | symtab, |
2570 | layout, | |
2571 | this, | |
2572 | object, | |
2573 | data_shndx, | |
2574 | prelocs, | |
2575 | reloc_count, | |
2576 | output_section, | |
2577 | needs_special_offset_handling, | |
2578 | local_symbol_count, | |
2579 | plocal_symbols); | |
2580 | } | |
2581 | ||
92e059d8 ILT |
2582 | // Scan relocations for a section. |
2583 | ||
2584 | void | |
ad0f2072 | 2585 | Target_i386::scan_relocs(Symbol_table* symtab, |
2e702c99 RM |
2586 | Layout* layout, |
2587 | Sized_relobj_file<32, false>* object, | |
2588 | unsigned int data_shndx, | |
2589 | unsigned int sh_type, | |
2590 | const unsigned char* prelocs, | |
2591 | size_t reloc_count, | |
2592 | Output_section* output_section, | |
2593 | bool needs_special_offset_handling, | |
2594 | size_t local_symbol_count, | |
2595 | const unsigned char* plocal_symbols) | |
92e059d8 ILT |
2596 | { |
2597 | if (sh_type == elfcpp::SHT_RELA) | |
2598 | { | |
75f2446e ILT |
2599 | gold_error(_("%s: unsupported RELA reloc section"), |
2600 | object->name().c_str()); | |
2601 | return; | |
92e059d8 ILT |
2602 | } |
2603 | ||
ead1e424 ILT |
2604 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2605 | Target_i386::Scan>( | |
92e059d8 | 2606 | symtab, |
ead1e424 ILT |
2607 | layout, |
2608 | this, | |
92e059d8 | 2609 | object, |
a3ad94ed | 2610 | data_shndx, |
92e059d8 ILT |
2611 | prelocs, |
2612 | reloc_count, | |
730cdc88 ILT |
2613 | output_section, |
2614 | needs_special_offset_handling, | |
92e059d8 | 2615 | local_symbol_count, |
730cdc88 | 2616 | plocal_symbols); |
92e059d8 ILT |
2617 | } |
2618 | ||
16649710 | 2619 | // Finalize the sections. |
5a6f7e2d ILT |
2620 | |
2621 | void | |
f59f41f3 DK |
2622 | Target_i386::do_finalize_sections( |
2623 | Layout* layout, | |
2624 | const Input_objects*, | |
e785ec03 | 2625 | Symbol_table* symtab) |
5a6f7e2d | 2626 | { |
ea715a34 ILT |
2627 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2628 | ? NULL | |
2629 | : this->plt_->rel_plt()); | |
2630 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2631 | this->rel_dyn_, true, false); |
16649710 ILT |
2632 | |
2633 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2634 | // relocs. | |
12c0daef ILT |
2635 | if (this->copy_relocs_.any_saved_relocs()) |
2636 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2637 | |
2638 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2639 | // the .got.plt section. | |
2640 | Symbol* sym = this->global_offset_table_; | |
2641 | if (sym != NULL) | |
2642 | { | |
2643 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2644 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2645 | } | |
28a13fec | 2646 | |
67181c72 ILT |
2647 | if (parameters->doing_static_link() |
2648 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2649 | { |
2650 | // If linking statically, make sure that the __rel_iplt symbols | |
2651 | // were defined if necessary, even if we didn't create a PLT. | |
2652 | static const Define_symbol_in_segment syms[] = | |
2653 | { | |
2654 | { | |
2655 | "__rel_iplt_start", // name | |
2656 | elfcpp::PT_LOAD, // segment_type | |
2657 | elfcpp::PF_W, // segment_flags_set | |
2658 | elfcpp::PF(0), // segment_flags_clear | |
2659 | 0, // value | |
2660 | 0, // size | |
2661 | elfcpp::STT_NOTYPE, // type | |
2662 | elfcpp::STB_GLOBAL, // binding | |
2663 | elfcpp::STV_HIDDEN, // visibility | |
2664 | 0, // nonvis | |
2665 | Symbol::SEGMENT_START, // offset_from_base | |
2666 | true // only_if_ref | |
2667 | }, | |
2668 | { | |
2669 | "__rel_iplt_end", // name | |
2670 | elfcpp::PT_LOAD, // segment_type | |
2671 | elfcpp::PF_W, // segment_flags_set | |
2672 | elfcpp::PF(0), // segment_flags_clear | |
2673 | 0, // value | |
2674 | 0, // size | |
2675 | elfcpp::STT_NOTYPE, // type | |
2676 | elfcpp::STB_GLOBAL, // binding | |
2677 | elfcpp::STV_HIDDEN, // visibility | |
2678 | 0, // nonvis | |
2679 | Symbol::SEGMENT_START, // offset_from_base | |
2680 | true // only_if_ref | |
2681 | } | |
2682 | }; | |
2683 | ||
2684 | symtab->define_symbols(layout, 2, syms, | |
2685 | layout->script_options()->saw_sections_clause()); | |
2686 | } | |
5a6f7e2d ILT |
2687 | } |
2688 | ||
86849f1f ILT |
2689 | // Return whether a direct absolute static relocation needs to be applied. |
2690 | // In cases where Scan::local() or Scan::global() has created | |
2691 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2692 | // of the relocation is carried in the data, and we must not | |
2693 | // apply the static relocation. | |
2694 | ||
2695 | inline bool | |
2696 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
2697 | unsigned int r_type, |
2698 | bool is_32bit, | |
031cdbed | 2699 | Output_section* output_section) |
86849f1f | 2700 | { |
031cdbed ILT |
2701 | // If the output section is not allocated, then we didn't call |
2702 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2703 | // the reloc here. | |
2704 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2705 | return true; | |
2706 | ||
95a2c8d6 RS |
2707 | int ref_flags = Scan::get_reference_flags(r_type); |
2708 | ||
d61c6bd4 ILT |
2709 | // For local symbols, we will have created a non-RELATIVE dynamic |
2710 | // relocation only if (a) the output is position independent, | |
2711 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2712 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2713 | if (gsym == NULL) |
8851ecca | 2714 | return !(parameters->options().output_is_position_independent() |
2e702c99 RM |
2715 | && (ref_flags & Symbol::ABSOLUTE_REF) |
2716 | && !is_32bit); | |
86849f1f | 2717 | |
0700cf32 ILT |
2718 | // For global symbols, we use the same helper routines used in the |
2719 | // scan pass. If we did not create a dynamic relocation, or if we | |
2720 | // created a RELATIVE dynamic relocation, we should apply the static | |
2721 | // relocation. | |
2722 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2723 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2e702c99 RM |
2724 | && gsym->can_use_relative_reloc(ref_flags |
2725 | & Symbol::FUNCTION_CALL); | |
0700cf32 | 2726 | return !has_dyn || is_rel; |
86849f1f ILT |
2727 | } |
2728 | ||
61ba1cf9 ILT |
2729 | // Perform a relocation. |
2730 | ||
ead1e424 | 2731 | inline bool |
92e059d8 | 2732 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
2e702c99 RM |
2733 | Target_i386* target, |
2734 | Output_section* output_section, | |
2735 | size_t relnum, | |
2736 | const elfcpp::Rel<32, false>& rel, | |
2737 | unsigned int r_type, | |
2738 | const Sized_symbol<32>* gsym, | |
2739 | const Symbol_value<32>* psymval, | |
2740 | unsigned char* view, | |
2741 | elfcpp::Elf_types<32>::Elf_Addr address, | |
2742 | section_size_type view_size) | |
61ba1cf9 | 2743 | { |
ead1e424 ILT |
2744 | if (this->skip_call_tls_get_addr_) |
2745 | { | |
5efc7cd2 | 2746 | if ((r_type != elfcpp::R_386_PLT32 |
2e702c99 | 2747 | && r_type != elfcpp::R_386_PC32) |
ead1e424 ILT |
2748 | || gsym == NULL |
2749 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2750 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2751 | _("missing expected TLS relocation")); | |
2752 | else | |
ead1e424 | 2753 | { |
75f2446e ILT |
2754 | this->skip_call_tls_get_addr_ = false; |
2755 | return false; | |
ead1e424 | 2756 | } |
ead1e424 ILT |
2757 | } |
2758 | ||
0e804863 ILT |
2759 | if (view == NULL) |
2760 | return true; | |
2761 | ||
6fa2a40b | 2762 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2763 | |
a3ad94ed | 2764 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2765 | Symbol_value<32> symval; |
436ca963 | 2766 | if (gsym != NULL |
7223e9ca ILT |
2767 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2768 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2769 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2770 | && gsym->can_use_relative_reloc(false) |
2771 | && !gsym->is_from_dynobj() | |
2772 | && !gsym->is_undefined() | |
2773 | && !gsym->is_preemptible()) | |
2774 | { | |
2775 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2776 | // want to use the real value of the symbol, not the PLT offset. | |
2777 | } | |
2778 | else if (gsym != NULL | |
95a2c8d6 | 2779 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2780 | { |
19fec8c1 | 2781 | symval.set_output_value(target->plt_address_for_global(gsym)); |
b8e6aad9 | 2782 | psymval = &symval; |
a3ad94ed | 2783 | } |
7223e9ca ILT |
2784 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2785 | { | |
2786 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2787 | if (object->local_has_plt_offset(r_sym)) | |
2788 | { | |
19fec8c1 | 2789 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
2790 | psymval = &symval; |
2791 | } | |
2792 | } | |
b8e6aad9 | 2793 | |
3043c1ab L |
2794 | bool baseless; |
2795 | ||
61ba1cf9 ILT |
2796 | switch (r_type) |
2797 | { | |
2798 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2799 | case elfcpp::R_386_GNU_VTINHERIT: |
2800 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2801 | break; |
2802 | ||
2803 | case elfcpp::R_386_32: | |
95a2c8d6 | 2804 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2805 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2806 | break; |
2807 | ||
2808 | case elfcpp::R_386_PC32: | |
95a2c8d6 | 2809 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2810 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
92e059d8 ILT |
2811 | break; |
2812 | ||
2813 | case elfcpp::R_386_16: | |
95a2c8d6 | 2814 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2815 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2816 | break; |
2817 | ||
2818 | case elfcpp::R_386_PC16: | |
95a2c8d6 | 2819 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2820 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
61ba1cf9 ILT |
2821 | break; |
2822 | ||
92e059d8 | 2823 | case elfcpp::R_386_8: |
95a2c8d6 | 2824 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2825 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2826 | break; |
2827 | ||
2828 | case elfcpp::R_386_PC8: | |
95a2c8d6 | 2829 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2830 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
92e059d8 ILT |
2831 | break; |
2832 | ||
ead1e424 | 2833 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2834 | gold_assert(gsym == NULL |
2835 | || gsym->has_plt_offset() | |
99f8faca ILT |
2836 | || gsym->final_value_is_known() |
2837 | || (gsym->is_defined() | |
2838 | && !gsym->is_from_dynobj() | |
2839 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2840 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2841 | break; |
2842 | ||
2843 | case elfcpp::R_386_GOT32: | |
493d4b48 | 2844 | case elfcpp::R_386_GOT32X: |
3043c1ab L |
2845 | baseless = (view[-1] & 0xc7) == 0x5; |
2846 | // R_386_GOT32 and R_386_GOT32X don't work without base register | |
2847 | // when generating a position-independent output file. | |
2848 | if (baseless | |
2849 | && parameters->options().output_is_position_independent()) | |
2850 | { | |
2851 | if(gsym) | |
2852 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
2853 | _("unexpected reloc %u against global symbol %s without base register in object file when generating a position-independent output file"), | |
2854 | r_type, gsym->demangled_name().c_str()); | |
2855 | else | |
2856 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
2857 | _("unexpected reloc %u against local symbol without base register in object file when generating a position-independent output file"), | |
2858 | r_type); | |
2859 | } | |
2860 | ||
c4fc4724 IT |
2861 | // Convert |
2862 | // mov foo@GOT(%reg), %reg | |
2863 | // to | |
2864 | // lea foo@GOTOFF(%reg), %reg | |
2865 | // if possible. | |
2866 | if (rel.get_r_offset() >= 2 | |
2867 | && view[-2] == 0x8b | |
2868 | && ((gsym == NULL && !psymval->is_ifunc_symbol()) | |
2869 | || (gsym != NULL | |
2870 | && Target_i386::can_convert_mov_to_lea(gsym)))) | |
2871 | { | |
2872 | view[-2] = 0x8d; | |
2873 | elfcpp::Elf_types<32>::Elf_Addr value; | |
3043c1ab L |
2874 | value = psymval->value(object, 0); |
2875 | // Don't subtract the .got.plt section address for baseless | |
2876 | // addressing. | |
2877 | if (!baseless) | |
2878 | value -= target->got_plt_section()->address(); | |
c4fc4724 IT |
2879 | Relocate_functions<32, false>::rel32(view, value); |
2880 | } | |
2881 | else | |
2882 | { | |
2883 | // The GOT pointer points to the end of the GOT section. | |
2884 | // We need to subtract the size of the GOT section to get | |
2885 | // the actual offset to use in the relocation. | |
2886 | unsigned int got_offset = 0; | |
2887 | if (gsym != NULL) | |
2888 | { | |
2889 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
2890 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2891 | - target->got_size()); | |
2892 | } | |
2893 | else | |
2894 | { | |
2895 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2896 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2897 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2898 | - target->got_size()); | |
2899 | } | |
3043c1ab L |
2900 | // Add the .got.plt section address for baseless addressing. |
2901 | if (baseless) | |
2902 | got_offset += target->got_plt_section()->address(); | |
c4fc4724 IT |
2903 | Relocate_functions<32, false>::rel32(view, got_offset); |
2904 | } | |
ead1e424 ILT |
2905 | break; |
2906 | ||
2907 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2908 | { |
2909 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2910 | value = (psymval->value(object, 0) | |
96f2030e | 2911 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2912 | Relocate_functions<32, false>::rel32(view, value); |
2913 | } | |
ead1e424 ILT |
2914 | break; |
2915 | ||
2916 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2917 | { |
2918 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2919 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2920 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2921 | } | |
ead1e424 ILT |
2922 | break; |
2923 | ||
92e059d8 ILT |
2924 | case elfcpp::R_386_COPY: |
2925 | case elfcpp::R_386_GLOB_DAT: | |
2926 | case elfcpp::R_386_JUMP_SLOT: | |
2927 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2928 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2929 | // These are outstanding tls relocs, which are unexpected when |
2930 | // linking. | |
92e059d8 ILT |
2931 | case elfcpp::R_386_TLS_TPOFF: |
2932 | case elfcpp::R_386_TLS_DTPMOD32: | |
2933 | case elfcpp::R_386_TLS_DTPOFF32: | |
2934 | case elfcpp::R_386_TLS_TPOFF32: | |
2935 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2936 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2937 | _("unexpected reloc %u in object file"), | |
2938 | r_type); | |
92e059d8 ILT |
2939 | break; |
2940 | ||
d61c17ea ILT |
2941 | // These are initial tls relocs, which are expected when |
2942 | // linking. | |
56622147 ILT |
2943 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2944 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2945 | case elfcpp::R_386_TLS_DESC_CALL: | |
2946 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2947 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2948 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2949 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2950 | case elfcpp::R_386_TLS_GOTIE: |
2951 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2952 | case elfcpp::R_386_TLS_LE_32: |
07f397ab | 2953 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2e702c99 | 2954 | view, address, view_size); |
92e059d8 ILT |
2955 | break; |
2956 | ||
92e059d8 ILT |
2957 | case elfcpp::R_386_32PLT: |
2958 | case elfcpp::R_386_TLS_GD_32: | |
2959 | case elfcpp::R_386_TLS_GD_PUSH: | |
2960 | case elfcpp::R_386_TLS_GD_CALL: | |
2961 | case elfcpp::R_386_TLS_GD_POP: | |
2962 | case elfcpp::R_386_TLS_LDM_32: | |
2963 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2964 | case elfcpp::R_386_TLS_LDM_CALL: | |
2965 | case elfcpp::R_386_TLS_LDM_POP: | |
2966 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2967 | default: |
75f2446e ILT |
2968 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2969 | _("unsupported reloc %u"), | |
2970 | r_type); | |
92e059d8 ILT |
2971 | break; |
2972 | } | |
ead1e424 ILT |
2973 | |
2974 | return true; | |
92e059d8 ILT |
2975 | } |
2976 | ||
2977 | // Perform a TLS relocation. | |
2978 | ||
2979 | inline void | |
2980 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
2e702c99 | 2981 | Target_i386* target, |
92e059d8 ILT |
2982 | size_t relnum, |
2983 | const elfcpp::Rel<32, false>& rel, | |
2984 | unsigned int r_type, | |
c06b7b0b | 2985 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2986 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2987 | unsigned char* view, |
2988 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2989 | section_size_type view_size) |
92e059d8 ILT |
2990 | { |
2991 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2992 | |
6fa2a40b | 2993 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2994 | |
2995 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2996 | |
b3705d2a ILT |
2997 | const bool is_final = (gsym == NULL |
2998 | ? !parameters->options().shared() | |
2999 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
3000 | const tls::Tls_optimization optimized_type |
3001 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
3002 | switch (r_type) |
3003 | { | |
56622147 | 3004 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 3005 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 3006 | { |
62855347 ILT |
3007 | if (tls_segment == NULL) |
3008 | { | |
191f1a2d ILT |
3009 | gold_assert(parameters->errors()->error_count() > 0 |
3010 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3011 | return; |
3012 | } | |
56622147 ILT |
3013 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
3014 | rel, r_type, value, view, | |
3015 | view_size); | |
92e059d8 ILT |
3016 | break; |
3017 | } | |
07f397ab | 3018 | else |
2e702c99 RM |
3019 | { |
3020 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3021 | ? GOT_TYPE_TLS_NOFFSET | |
3022 | : GOT_TYPE_TLS_PAIR); | |
3023 | unsigned int got_offset; | |
3024 | if (gsym != NULL) | |
3025 | { | |
3026 | gold_assert(gsym->has_got_offset(got_type)); | |
3027 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3028 | } | |
3029 | else | |
3030 | { | |
3031 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3032 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3033 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab | 3034 | - target->got_size()); |
2e702c99 RM |
3035 | } |
3036 | if (optimized_type == tls::TLSOPT_TO_IE) | |
07f397ab | 3037 | { |
7bf1f802 | 3038 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
3039 | got_offset, view, view_size); |
3040 | break; | |
3041 | } | |
3042 | else if (optimized_type == tls::TLSOPT_NONE) | |
3043 | { | |
3044 | // Relocate the field with the offset of the pair of GOT | |
3045 | // entries. | |
3046 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3047 | break; | |
07f397ab | 3048 | } |
2e702c99 | 3049 | } |
75f2446e ILT |
3050 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3051 | _("unsupported reloc %u"), | |
3052 | r_type); | |
92e059d8 ILT |
3053 | break; |
3054 | ||
56622147 ILT |
3055 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
3056 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 3057 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 | 3058 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3059 | { |
62855347 ILT |
3060 | if (tls_segment == NULL) |
3061 | { | |
191f1a2d ILT |
3062 | gold_assert(parameters->errors()->error_count() > 0 |
3063 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3064 | return; |
3065 | } | |
c2b45e22 | 3066 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3067 | rel, r_type, value, view, |
3068 | view_size); | |
c2b45e22 | 3069 | break; |
2e702c99 | 3070 | } |
c2b45e22 | 3071 | else |
2e702c99 RM |
3072 | { |
3073 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3074 | ? GOT_TYPE_TLS_NOFFSET | |
3075 | : GOT_TYPE_TLS_DESC); | |
3076 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3077 | if (r_type == elfcpp::R_386_TLS_GOTDESC |
3078 | && optimized_type == tls::TLSOPT_NONE) | |
3079 | { | |
3080 | // We created GOT entries in the .got.tlsdesc portion of | |
3081 | // the .got.plt section, but the offset stored in the | |
3082 | // symbol is the offset within .got.tlsdesc. | |
3083 | got_offset = (target->got_size() | |
3084 | + target->got_plt_section()->data_size()); | |
3085 | } | |
2e702c99 RM |
3086 | if (gsym != NULL) |
3087 | { | |
3088 | gold_assert(gsym->has_got_offset(got_type)); | |
3089 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3090 | } | |
3091 | else | |
3092 | { | |
3093 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3094 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3095 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3096 | - target->got_size()); |
2e702c99 RM |
3097 | } |
3098 | if (optimized_type == tls::TLSOPT_TO_IE) | |
c2b45e22 | 3099 | { |
62855347 ILT |
3100 | if (tls_segment == NULL) |
3101 | { | |
191f1a2d ILT |
3102 | gold_assert(parameters->errors()->error_count() > 0 |
3103 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3104 | return; |
3105 | } | |
c2b45e22 | 3106 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
3107 | got_offset, view, view_size); |
3108 | break; | |
3109 | } | |
3110 | else if (optimized_type == tls::TLSOPT_NONE) | |
3111 | { | |
3112 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3113 | { | |
3114 | // Relocate the field with the offset of the pair of GOT | |
3115 | // entries. | |
3116 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3117 | } | |
3118 | break; | |
c2b45e22 | 3119 | } |
2e702c99 | 3120 | } |
75f2446e ILT |
3121 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3122 | _("unsupported reloc %u"), | |
3123 | r_type); | |
ead1e424 ILT |
3124 | break; |
3125 | ||
56622147 | 3126 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
3127 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
3128 | { | |
75f2446e ILT |
3129 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3130 | _("both SUN and GNU model " | |
3131 | "TLS relocations")); | |
3132 | break; | |
46cf9fa2 ILT |
3133 | } |
3134 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 3135 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 3136 | { |
62855347 ILT |
3137 | if (tls_segment == NULL) |
3138 | { | |
191f1a2d ILT |
3139 | gold_assert(parameters->errors()->error_count() > 0 |
3140 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3141 | return; |
3142 | } | |
46cf9fa2 ILT |
3143 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
3144 | value, view, view_size); | |
3145 | break; | |
3146 | } | |
07f397ab | 3147 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3148 | { |
3149 | // Relocate the field with the offset of the GOT entry for | |
3150 | // the module index. | |
3151 | unsigned int got_offset; | |
3152 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
94c4710f | 3153 | - target->got_size()); |
2e702c99 RM |
3154 | Relocate_functions<32, false>::rel32(view, got_offset); |
3155 | break; | |
3156 | } | |
75f2446e ILT |
3157 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3158 | _("unsupported reloc %u"), | |
3159 | r_type); | |
46cf9fa2 ILT |
3160 | break; |
3161 | ||
56622147 | 3162 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 3163 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 3164 | { |
82bb573a ILT |
3165 | // This reloc can appear in debugging sections, in which |
3166 | // case we must not convert to local-exec. We decide what | |
3167 | // to do based on whether the section is marked as | |
3168 | // containing executable code. That is what the GNU linker | |
3169 | // does as well. | |
3170 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
3171 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 3172 | { |
62855347 ILT |
3173 | if (tls_segment == NULL) |
3174 | { | |
191f1a2d ILT |
3175 | gold_assert(parameters->errors()->error_count() > 0 |
3176 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3177 | return; |
3178 | } | |
d6f22b98 ILT |
3179 | value -= tls_segment->memsz(); |
3180 | } | |
e8a9fcda | 3181 | } |
46cf9fa2 ILT |
3182 | Relocate_functions<32, false>::rel32(view, value); |
3183 | break; | |
3184 | ||
56622147 ILT |
3185 | case elfcpp::R_386_TLS_IE: // Initial-exec |
3186 | case elfcpp::R_386_TLS_GOTIE: | |
3187 | case elfcpp::R_386_TLS_IE_32: | |
3188 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3189 | { | |
62855347 ILT |
3190 | if (tls_segment == NULL) |
3191 | { | |
191f1a2d ILT |
3192 | gold_assert(parameters->errors()->error_count() > 0 |
3193 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3194 | return; |
3195 | } | |
56622147 ILT |
3196 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
3197 | rel, r_type, value, view, | |
3198 | view_size); | |
3199 | break; | |
3200 | } | |
07f397ab | 3201 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3202 | { |
3203 | // Relocate the field with the offset of the GOT entry for | |
3204 | // the tp-relative offset of the symbol. | |
c2b45e22 | 3205 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2e702c99 RM |
3206 | ? GOT_TYPE_TLS_OFFSET |
3207 | : GOT_TYPE_TLS_NOFFSET); | |
3208 | unsigned int got_offset; | |
3209 | if (gsym != NULL) | |
3210 | { | |
3211 | gold_assert(gsym->has_got_offset(got_type)); | |
3212 | got_offset = gsym->got_offset(got_type); | |
3213 | } | |
3214 | else | |
3215 | { | |
3216 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3217 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3218 | got_offset = object->local_got_offset(r_sym, got_type); | |
3219 | } | |
3220 | // For the R_386_TLS_IE relocation, we need to apply the | |
3221 | // absolute address of the GOT entry. | |
3222 | if (r_type == elfcpp::R_386_TLS_IE) | |
3223 | got_offset += target->got_plt_section()->address(); | |
3224 | // All GOT offsets are relative to the end of the GOT. | |
3225 | got_offset -= target->got_size(); | |
3226 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3227 | break; | |
3228 | } | |
75f2446e ILT |
3229 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3230 | _("unsupported reloc %u"), | |
3231 | r_type); | |
92e059d8 | 3232 | break; |
92e059d8 | 3233 | |
56622147 | 3234 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
3235 | // If we're creating a shared library, a dynamic relocation will |
3236 | // have been created for this location, so do not apply it now. | |
8851ecca | 3237 | if (!parameters->options().shared()) |
2e702c99 | 3238 | { |
62855347 ILT |
3239 | if (tls_segment == NULL) |
3240 | { | |
191f1a2d ILT |
3241 | gold_assert(parameters->errors()->error_count() > 0 |
3242 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3243 | return; |
3244 | } | |
2e702c99 RM |
3245 | value -= tls_segment->memsz(); |
3246 | Relocate_functions<32, false>::rel32(view, value); | |
3247 | } | |
56622147 | 3248 | break; |
92e059d8 | 3249 | |
56622147 | 3250 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
3251 | // If we're creating a shared library, a dynamic relocation will |
3252 | // have been created for this location, so do not apply it now. | |
8851ecca | 3253 | if (!parameters->options().shared()) |
2e702c99 | 3254 | { |
62855347 ILT |
3255 | if (tls_segment == NULL) |
3256 | { | |
191f1a2d ILT |
3257 | gold_assert(parameters->errors()->error_count() > 0 |
3258 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3259 | return; |
3260 | } | |
2e702c99 RM |
3261 | value = tls_segment->memsz() - value; |
3262 | Relocate_functions<32, false>::rel32(view, value); | |
3263 | } | |
56622147 | 3264 | break; |
92e059d8 | 3265 | } |
92e059d8 ILT |
3266 | } |
3267 | ||
e041f13d | 3268 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
3269 | // Local-Exec. |
3270 | ||
3271 | inline void | |
3272 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
3273 | size_t relnum, | |
3274 | Output_segment* tls_segment, | |
3275 | const elfcpp::Rel<32, false>& rel, | |
3276 | unsigned int, | |
3277 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3278 | unsigned char* view, | |
fe8718a4 | 3279 | section_size_type view_size) |
ead1e424 ILT |
3280 | { |
3281 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 3282 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
3283 | // leal foo(%reg),%eax; call ___tls_get_addr |
3284 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
3285 | ||
af6359d5 ILT |
3286 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3287 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
3288 | |
3289 | unsigned char op1 = view[-1]; | |
3290 | unsigned char op2 = view[-2]; | |
3291 | ||
af6359d5 | 3292 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3293 | op2 == 0x8d || op2 == 0x04); |
af6359d5 | 3294 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
ead1e424 ILT |
3295 | |
3296 | int roff = 5; | |
3297 | ||
3298 | if (op2 == 0x04) | |
3299 | { | |
af6359d5 ILT |
3300 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
3301 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3302 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3303 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
ead1e424 ILT |
3304 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
3305 | } | |
3306 | else | |
3307 | { | |
af6359d5 | 3308 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3309 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3310 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3311 | && view[9] == 0x90) |
ead1e424 ILT |
3312 | { |
3313 | // There is a trailing nop. Use the size byte subl. | |
3314 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3315 | roff = 6; | |
3316 | } | |
3317 | else | |
3318 | { | |
3319 | // Use the five byte subl. | |
3320 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3321 | } | |
3322 | } | |
3323 | ||
7bf1f802 | 3324 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3325 | Relocate_functions<32, false>::rel32(view + roff, value); |
3326 | ||
3327 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3328 | // We can skip it. | |
3329 | this->skip_call_tls_get_addr_ = true; | |
3330 | } | |
3331 | ||
7bf1f802 | 3332 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3333 | // Initial-Exec. |
3334 | ||
3335 | inline void | |
3336 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3337 | size_t relnum, | |
c2b45e22 | 3338 | Output_segment*, |
07f397ab ILT |
3339 | const elfcpp::Rel<32, false>& rel, |
3340 | unsigned int, | |
3341 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3342 | unsigned char* view, | |
fe8718a4 | 3343 | section_size_type view_size) |
07f397ab ILT |
3344 | { |
3345 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3346 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
152f7024 CC |
3347 | // leal foo(%ebx),%eax; call ___tls_get_addr; nop |
3348 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
07f397ab ILT |
3349 | |
3350 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3351 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3352 | ||
3353 | unsigned char op1 = view[-1]; | |
3354 | unsigned char op2 = view[-2]; | |
3355 | ||
3356 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3357 | op2 == 0x8d || op2 == 0x04); |
07f397ab ILT |
3358 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
3359 | ||
152f7024 | 3360 | int roff; |
07f397ab ILT |
3361 | |
3362 | if (op2 == 0x04) | |
3363 | { | |
3364 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3365 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3366 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3367 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
152f7024 | 3368 | roff = 5; |
07f397ab ILT |
3369 | } |
3370 | else | |
3371 | { | |
152f7024 | 3372 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 10); |
07f397ab | 3373 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3374 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
152f7024 CC |
3375 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[9] == 0x90); |
3376 | roff = 6; | |
07f397ab ILT |
3377 | } |
3378 | ||
152f7024 | 3379 | memcpy(view + roff - 8, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); |
07f397ab ILT |
3380 | Relocate_functions<32, false>::rel32(view + roff, value); |
3381 | ||
3382 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3383 | // We can skip it. | |
3384 | this->skip_call_tls_get_addr_ = true; | |
3385 | } | |
3386 | ||
c2b45e22 CC |
3387 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3388 | // General-Dynamic to a Local-Exec. | |
3389 | ||
3390 | inline void | |
3391 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3392 | const Relocate_info<32, false>* relinfo, | |
3393 | size_t relnum, | |
3394 | Output_segment* tls_segment, | |
3395 | const elfcpp::Rel<32, false>& rel, | |
3396 | unsigned int r_type, | |
3397 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3398 | unsigned char* view, | |
3399 | section_size_type view_size) | |
3400 | { | |
3401 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3402 | { | |
3403 | // leal foo@TLSDESC(%ebx), %eax | |
3404 | // ==> leal foo@NTPOFF, %eax | |
3405 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3406 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3407 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3408 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3409 | view[-1] = 0x05; |
3410 | value -= tls_segment->memsz(); | |
3411 | Relocate_functions<32, false>::rel32(view, value); | |
3412 | } | |
3413 | else | |
3414 | { | |
3415 | // call *foo@TLSCALL(%eax) | |
3416 | // ==> nop; nop | |
3417 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3418 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3419 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3420 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3421 | view[0] = 0x66; |
3422 | view[1] = 0x90; | |
3423 | } | |
3424 | } | |
3425 | ||
3426 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3427 | // General-Dynamic to an Initial-Exec. | |
3428 | ||
3429 | inline void | |
3430 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3431 | const Relocate_info<32, false>* relinfo, | |
3432 | size_t relnum, | |
3433 | Output_segment*, | |
3434 | const elfcpp::Rel<32, false>& rel, | |
3435 | unsigned int r_type, | |
3436 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3437 | unsigned char* view, | |
3438 | section_size_type view_size) | |
3439 | { | |
3440 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3441 | { | |
3442 | // leal foo@TLSDESC(%ebx), %eax | |
3443 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3444 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3445 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3446 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3447 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3448 | view[-2] = 0x8b; |
3449 | Relocate_functions<32, false>::rel32(view, value); | |
3450 | } | |
3451 | else | |
3452 | { | |
3453 | // call *foo@TLSCALL(%eax) | |
3454 | // ==> nop; nop | |
3455 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3456 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3457 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3458 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3459 | view[0] = 0x66; |
3460 | view[1] = 0x90; | |
3461 | } | |
3462 | } | |
3463 | ||
46cf9fa2 ILT |
3464 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3465 | // Local-Exec. | |
3466 | ||
3467 | inline void | |
3468 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3469 | size_t relnum, | |
3470 | Output_segment*, | |
3471 | const elfcpp::Rel<32, false>& rel, | |
3472 | unsigned int, | |
3473 | elfcpp::Elf_types<32>::Elf_Addr, | |
3474 | unsigned char* view, | |
fe8718a4 | 3475 | section_size_type view_size) |
46cf9fa2 ILT |
3476 | { |
3477 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3478 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3479 | ||
af6359d5 ILT |
3480 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3481 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3482 | |
3483 | // FIXME: Does this test really always pass? | |
af6359d5 | 3484 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3485 | view[-2] == 0x8d && view[-1] == 0x83); |
46cf9fa2 | 3486 | |
af6359d5 | 3487 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3488 | |
3489 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3490 | ||
3491 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3492 | // We can skip it. | |
3493 | this->skip_call_tls_get_addr_ = true; | |
3494 | } | |
3495 | ||
56622147 ILT |
3496 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3497 | // Local-Exec. | |
3498 | ||
3499 | inline void | |
3500 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3501 | size_t relnum, | |
3502 | Output_segment* tls_segment, | |
3503 | const elfcpp::Rel<32, false>& rel, | |
3504 | unsigned int r_type, | |
3505 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3506 | unsigned char* view, | |
fe8718a4 | 3507 | section_size_type view_size) |
56622147 ILT |
3508 | { |
3509 | // We have to actually change the instructions, which means that we | |
3510 | // need to examine the opcodes to figure out which instruction we | |
3511 | // are looking at. | |
3512 | if (r_type == elfcpp::R_386_TLS_IE) | |
3513 | { | |
3514 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3515 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3516 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3517 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3518 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3519 | ||
3520 | unsigned char op1 = view[-1]; | |
3521 | if (op1 == 0xa1) | |
3522 | { | |
3523 | // movl XX,%eax ==> movl $YY,%eax | |
3524 | view[-1] = 0xb8; | |
3525 | } | |
3526 | else | |
3527 | { | |
3528 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3529 | ||
3530 | unsigned char op2 = view[-2]; | |
3531 | if (op2 == 0x8b) | |
3532 | { | |
3533 | // movl XX,%reg ==> movl $YY,%reg | |
3534 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3535 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3536 | view[-2] = 0xc7; |
3537 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3538 | } | |
3539 | else if (op2 == 0x03) | |
3540 | { | |
3541 | // addl XX,%reg ==> addl $YY,%reg | |
3542 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3543 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3544 | view[-2] = 0x81; |
3545 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3546 | } | |
3547 | else | |
3548 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3549 | } | |
3550 | } | |
3551 | else | |
3552 | { | |
3553 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3554 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3555 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3556 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3557 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3558 | ||
3559 | unsigned char op1 = view[-1]; | |
3560 | unsigned char op2 = view[-2]; | |
3561 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3562 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); |
56622147 ILT |
3563 | if (op2 == 0x8b) |
3564 | { | |
3565 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3566 | view[-2] = 0xc7; | |
3567 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3568 | } | |
3569 | else if (op2 == 0x2b) | |
3570 | { | |
3571 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3572 | view[-2] = 0x81; | |
3573 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3574 | } | |
3575 | else if (op2 == 0x03) | |
3576 | { | |
3577 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3578 | view[-2] = 0x81; | |
3579 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3580 | } | |
3581 | else | |
3582 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3583 | } | |
3584 | ||
7bf1f802 | 3585 | value = tls_segment->memsz() - value; |
56622147 ILT |
3586 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3587 | value = - value; | |
3588 | ||
3589 | Relocate_functions<32, false>::rel32(view, value); | |
3590 | } | |
3591 | ||
61ba1cf9 ILT |
3592 | // Relocate section data. |
3593 | ||
3594 | void | |
92e059d8 | 3595 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3596 | unsigned int sh_type, |
3597 | const unsigned char* prelocs, | |
3598 | size_t reloc_count, | |
730cdc88 ILT |
3599 | Output_section* output_section, |
3600 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3601 | unsigned char* view, |
3602 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3603 | section_size_type view_size, |
3604 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3605 | { |
a3ad94ed | 3606 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3607 | |
ead1e424 | 3608 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
168a4726 | 3609 | Target_i386::Relocate, gold::Default_comdat_behavior>( |
92e059d8 | 3610 | relinfo, |
ead1e424 | 3611 | this, |
61ba1cf9 ILT |
3612 | prelocs, |
3613 | reloc_count, | |
730cdc88 ILT |
3614 | output_section, |
3615 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3616 | view, |
3617 | address, | |
364c7fa5 ILT |
3618 | view_size, |
3619 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3620 | } |
3621 | ||
6a74a719 ILT |
3622 | // Return the size of a relocation while scanning during a relocatable |
3623 | // link. | |
3624 | ||
3625 | unsigned int | |
3626 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3627 | unsigned int r_type, | |
3628 | Relobj* object) | |
3629 | { | |
3630 | switch (r_type) | |
3631 | { | |
3632 | case elfcpp::R_386_NONE: | |
3633 | case elfcpp::R_386_GNU_VTINHERIT: | |
3634 | case elfcpp::R_386_GNU_VTENTRY: | |
3635 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3636 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3637 | case elfcpp::R_386_TLS_DESC_CALL: | |
3638 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3639 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3640 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3641 | case elfcpp::R_386_TLS_IE_32: | |
3642 | case elfcpp::R_386_TLS_GOTIE: | |
3643 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3644 | case elfcpp::R_386_TLS_LE_32: | |
3645 | return 0; | |
3646 | ||
3647 | case elfcpp::R_386_32: | |
3648 | case elfcpp::R_386_PC32: | |
3649 | case elfcpp::R_386_GOT32: | |
493d4b48 | 3650 | case elfcpp::R_386_GOT32X: |
6a74a719 ILT |
3651 | case elfcpp::R_386_PLT32: |
3652 | case elfcpp::R_386_GOTOFF: | |
3653 | case elfcpp::R_386_GOTPC: | |
3654 | return 4; | |
3655 | ||
3656 | case elfcpp::R_386_16: | |
3657 | case elfcpp::R_386_PC16: | |
3658 | return 2; | |
3659 | ||
3660 | case elfcpp::R_386_8: | |
3661 | case elfcpp::R_386_PC8: | |
3662 | return 1; | |
3663 | ||
3664 | // These are relocations which should only be seen by the | |
3665 | // dynamic linker, and should never be seen here. | |
3666 | case elfcpp::R_386_COPY: | |
3667 | case elfcpp::R_386_GLOB_DAT: | |
3668 | case elfcpp::R_386_JUMP_SLOT: | |
3669 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3670 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3671 | case elfcpp::R_386_TLS_TPOFF: |
3672 | case elfcpp::R_386_TLS_DTPMOD32: | |
3673 | case elfcpp::R_386_TLS_DTPOFF32: | |
3674 | case elfcpp::R_386_TLS_TPOFF32: | |
3675 | case elfcpp::R_386_TLS_DESC: | |
3676 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3677 | return 0; | |
3678 | ||
3679 | case elfcpp::R_386_32PLT: | |
3680 | case elfcpp::R_386_TLS_GD_32: | |
3681 | case elfcpp::R_386_TLS_GD_PUSH: | |
3682 | case elfcpp::R_386_TLS_GD_CALL: | |
3683 | case elfcpp::R_386_TLS_GD_POP: | |
3684 | case elfcpp::R_386_TLS_LDM_32: | |
3685 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3686 | case elfcpp::R_386_TLS_LDM_CALL: | |
3687 | case elfcpp::R_386_TLS_LDM_POP: | |
3688 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3689 | default: | |
3690 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3691 | return 0; | |
3692 | } | |
3693 | } | |
3694 | ||
3695 | // Scan the relocs during a relocatable link. | |
3696 | ||
3697 | void | |
ad0f2072 | 3698 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3699 | Layout* layout, |
6fa2a40b | 3700 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3701 | unsigned int data_shndx, |
3702 | unsigned int sh_type, | |
3703 | const unsigned char* prelocs, | |
3704 | size_t reloc_count, | |
3705 | Output_section* output_section, | |
3706 | bool needs_special_offset_handling, | |
3707 | size_t local_symbol_count, | |
3708 | const unsigned char* plocal_symbols, | |
3709 | Relocatable_relocs* rr) | |
3710 | { | |
3711 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3712 | ||
3713 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3714 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3715 | ||
7019cd25 | 3716 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3717 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3718 | symtab, |
3719 | layout, | |
3720 | object, | |
3721 | data_shndx, | |
3722 | prelocs, | |
3723 | reloc_count, | |
3724 | output_section, | |
3725 | needs_special_offset_handling, | |
3726 | local_symbol_count, | |
3727 | plocal_symbols, | |
3728 | rr); | |
3729 | } | |
3730 | ||
7404fe1b | 3731 | // Emit relocations for a section. |
6a74a719 ILT |
3732 | |
3733 | void | |
7404fe1b | 3734 | Target_i386::relocate_relocs( |
6a74a719 ILT |
3735 | const Relocate_info<32, false>* relinfo, |
3736 | unsigned int sh_type, | |
3737 | const unsigned char* prelocs, | |
3738 | size_t reloc_count, | |
3739 | Output_section* output_section, | |
cc928013 | 3740 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
3741 | const Relocatable_relocs* rr, |
3742 | unsigned char* view, | |
3743 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3744 | section_size_type view_size, | |
3745 | unsigned char* reloc_view, | |
3746 | section_size_type reloc_view_size) | |
3747 | { | |
3748 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3749 | ||
7404fe1b | 3750 | gold::relocate_relocs<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3751 | relinfo, |
3752 | prelocs, | |
3753 | reloc_count, | |
3754 | output_section, | |
3755 | offset_in_output_section, | |
3756 | rr, | |
3757 | view, | |
3758 | view_address, | |
3759 | view_size, | |
3760 | reloc_view, | |
3761 | reloc_view_size); | |
3762 | } | |
3763 | ||
ab5c9e90 ILT |
3764 | // Return the value to use for a dynamic which requires special |
3765 | // treatment. This is how we support equality comparisons of function | |
3766 | // pointers across shared library boundaries, as described in the | |
3767 | // processor specific ABI supplement. | |
3768 | ||
3769 | uint64_t | |
3770 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3771 | { | |
3772 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 3773 | return this->plt_address_for_global(gsym); |
ab5c9e90 ILT |
3774 | } |
3775 | ||
c51e6221 ILT |
3776 | // Return a string used to fill a code section with nops to take up |
3777 | // the specified length. | |
3778 | ||
3779 | std::string | |
8851ecca | 3780 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3781 | { |
3782 | if (length >= 16) | |
3783 | { | |
3784 | // Build a jmp instruction to skip over the bytes. | |
3785 | unsigned char jmp[5]; | |
3786 | jmp[0] = 0xe9; | |
3787 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3788 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2e702c99 | 3789 | + std::string(length - 5, static_cast<char>(0x90))); |
c51e6221 ILT |
3790 | } |
3791 | ||
3792 | // Nop sequences of various lengths. | |
76677ad0 CC |
3793 | const char nop1[1] = { '\x90' }; // nop |
3794 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3795 | const char nop3[3] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi | |
3796 | const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
3797 | '\x00'}; | |
3798 | const char nop5[5] = { '\x90', '\x8d', '\x74', // nop | |
2e702c99 | 3799 | '\x26', '\x00' }; // leal 0(%esi,1),%esi |
76677ad0 | 3800 | const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi |
2e702c99 | 3801 | '\x00', '\x00', '\x00' }; |
76677ad0 | 3802 | const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3803 | '\x00', '\x00', '\x00', |
76677ad0 CC |
3804 | '\x00' }; |
3805 | const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop | |
2e702c99 | 3806 | '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi |
76677ad0 CC |
3807 | '\x00', '\x00' }; |
3808 | const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi | |
2e702c99 | 3809 | '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3810 | '\x00', '\x00', '\x00' }; |
3811 | const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi | |
2e702c99 | 3812 | '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3813 | '\x00', '\x00', '\x00', |
3814 | '\x00' }; | |
3815 | const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
2e702c99 | 3816 | '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3817 | '\x27', '\x00', '\x00', |
3818 | '\x00', '\x00' }; | |
3819 | const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3820 | '\x00', '\x00', '\x00', // leal 0L(%edi),%edi |
76677ad0 CC |
3821 | '\x8d', '\xbf', '\x00', |
3822 | '\x00', '\x00', '\x00' }; | |
3823 | const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3824 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3825 | '\x8d', '\xbc', '\x27', |
3826 | '\x00', '\x00', '\x00', | |
2e702c99 | 3827 | '\x00' }; |
76677ad0 | 3828 | const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3829 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3830 | '\x00', '\x8d', '\xbc', |
3831 | '\x27', '\x00', '\x00', | |
2e702c99 | 3832 | '\x00', '\x00' }; |
76677ad0 | 3833 | const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15 |
2e702c99 | 3834 | '\x90', '\x90', '\x90', // nop,nop,nop,... |
76677ad0 CC |
3835 | '\x90', '\x90', '\x90', |
3836 | '\x90', '\x90', '\x90', | |
2e702c99 | 3837 | '\x90', '\x90', '\x90' }; |
c51e6221 ILT |
3838 | |
3839 | const char* nops[16] = { | |
3840 | NULL, | |
3841 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3842 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3843 | }; | |
3844 | ||
3845 | return std::string(nops[length], length); | |
3846 | } | |
3847 | ||
02d7cd44 ILT |
3848 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3849 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3850 | // assembler can not write out the difference between two labels in | |
3851 | // different sections, so instead of using a pc-relative value they | |
3852 | // use an offset from the GOT. | |
3853 | ||
3854 | uint64_t | |
3855 | Target_i386::do_ehframe_datarel_base() const | |
3856 | { | |
3857 | gold_assert(this->global_offset_table_ != NULL); | |
3858 | Symbol* sym = this->global_offset_table_; | |
3859 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3860 | return ssym->value(); | |
3861 | } | |
3862 | ||
b6848d3c ILT |
3863 | // Return whether SYM should be treated as a call to a non-split |
3864 | // function. We don't want that to be true of a call to a | |
3865 | // get_pc_thunk function. | |
3866 | ||
3867 | bool | |
3868 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3869 | { | |
3870 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3871 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3872 | } | |
3873 | ||
364c7fa5 | 3874 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3875 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3876 | // code. We have to change the function so that it always ensures |
3877 | // that it has enough stack space to run some random function. | |
3878 | ||
3879 | void | |
3880 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2e702c99 RM |
3881 | section_offset_type fnoffset, |
3882 | section_size_type fnsize, | |
3883 | unsigned char* view, | |
3884 | section_size_type view_size, | |
3885 | std::string* from, | |
3886 | std::string* to) const | |
364c7fa5 ILT |
3887 | { |
3888 | // The function starts with a comparison of the stack pointer and a | |
3889 | // field in the TCB. This is followed by a jump. | |
3890 | ||
3891 | // cmp %gs:NN,%esp | |
3892 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3893 | && fnsize > 7) | |
3894 | { | |
3895 | // We will call __morestack if the carry flag is set after this | |
3896 | // comparison. We turn the comparison into an stc instruction | |
3897 | // and some nops. | |
3898 | view[fnoffset] = '\xf9'; | |
3899 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3900 | } | |
3901 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3902 | // lea NN(%esp),%edx |
3903 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3904 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3905 | && fnsize > 7) |
3906 | { | |
3907 | // This is loading an offset from the stack pointer for a | |
3908 | // comparison. The offset is negative, so we decrease the | |
3909 | // offset by the amount of space we need for the stack. This | |
3910 | // means we will avoid calling __morestack if there happens to | |
3911 | // be plenty of space on the stack already. | |
3912 | unsigned char* pval = view + fnoffset + 3; | |
3913 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3914 | val -= parameters->options().split_stack_adjust_size(); | |
3915 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3916 | } | |
3917 | else | |
3918 | { | |
3919 | if (!object->has_no_split_stack()) | |
3920 | object->error(_("failed to match split-stack sequence at " | |
3921 | "section %u offset %0zx"), | |
ac33a407 | 3922 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3923 | return; |
3924 | } | |
3925 | ||
3926 | // We have to change the function so that it calls | |
3927 | // __morestack_non_split instead of __morestack. The former will | |
3928 | // allocate additional stack space. | |
3929 | *from = "__morestack"; | |
3930 | *to = "__morestack_non_split"; | |
3931 | } | |
3932 | ||
2e702c99 RM |
3933 | // The selector for i386 object files. Note this is never instantiated |
3934 | // directly. It's only used in Target_selector_i386_nacl, below. | |
14bfc3f5 | 3935 | |
36959681 | 3936 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3937 | { |
3938 | public: | |
3939 | Target_selector_i386() | |
36959681 | 3940 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3941 | "elf32-i386", "elf32-i386-freebsd", |
3942 | "elf_i386") | |
14bfc3f5 ILT |
3943 | { } |
3944 | ||
3945 | Target* | |
e96caa79 ILT |
3946 | do_instantiate_target() |
3947 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3948 | }; |
3949 | ||
2e702c99 RM |
3950 | // NaCl variant. It uses different PLT contents. |
3951 | ||
3952 | class Output_data_plt_i386_nacl : public Output_data_plt_i386 | |
3953 | { | |
3954 | public: | |
3955 | Output_data_plt_i386_nacl(Layout* layout, | |
57b2284c | 3956 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
3957 | Output_data_space* got_irelative) |
3958 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
3959 | { } | |
3960 | ||
3961 | protected: | |
3962 | virtual unsigned int | |
3963 | do_get_plt_entry_size() const | |
3964 | { return plt_entry_size; } | |
3965 | ||
3966 | virtual void | |
3967 | do_add_eh_frame(Layout* layout) | |
3968 | { | |
3969 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
3970 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
3971 | } | |
3972 | ||
3973 | // The size of an entry in the PLT. | |
3974 | static const int plt_entry_size = 64; | |
3975 | ||
3976 | // The .eh_frame unwind information for the PLT. | |
3977 | static const int plt_eh_frame_fde_size = 32; | |
3978 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
3979 | }; | |
3980 | ||
3981 | class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl | |
3982 | { | |
3983 | public: | |
3984 | Output_data_plt_i386_nacl_exec(Layout* layout, | |
57b2284c | 3985 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
3986 | Output_data_space* got_irelative) |
3987 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3988 | { } | |
3989 | ||
3990 | protected: | |
3991 | virtual void | |
3992 | do_fill_first_plt_entry(unsigned char* pov, | |
3993 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
3994 | ||
3995 | virtual unsigned int | |
3996 | do_fill_plt_entry(unsigned char* pov, | |
3997 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
3998 | unsigned int got_offset, | |
3999 | unsigned int plt_offset, | |
4000 | unsigned int plt_rel_offset); | |
4001 | ||
4002 | private: | |
4003 | // The first entry in the PLT for an executable. | |
4004 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4005 | ||
4006 | // Other entries in the PLT for an executable. | |
4007 | static const unsigned char plt_entry[plt_entry_size]; | |
4008 | }; | |
4009 | ||
4010 | class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl | |
4011 | { | |
4012 | public: | |
4013 | Output_data_plt_i386_nacl_dyn(Layout* layout, | |
57b2284c | 4014 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4015 | Output_data_space* got_irelative) |
4016 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
4017 | { } | |
4018 | ||
4019 | protected: | |
4020 | virtual void | |
4021 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
4022 | ||
4023 | virtual unsigned int | |
4024 | do_fill_plt_entry(unsigned char* pov, | |
4025 | elfcpp::Elf_types<32>::Elf_Addr, | |
4026 | unsigned int got_offset, | |
4027 | unsigned int plt_offset, | |
4028 | unsigned int plt_rel_offset); | |
4029 | ||
4030 | private: | |
4031 | // The first entry in the PLT for a shared object. | |
4032 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4033 | ||
4034 | // Other entries in the PLT for a shared object. | |
4035 | static const unsigned char plt_entry[plt_entry_size]; | |
4036 | }; | |
4037 | ||
4038 | class Target_i386_nacl : public Target_i386 | |
4039 | { | |
4040 | public: | |
4041 | Target_i386_nacl() | |
4042 | : Target_i386(&i386_nacl_info) | |
4043 | { } | |
4044 | ||
4045 | protected: | |
4046 | virtual Output_data_plt_i386* | |
4047 | do_make_data_plt(Layout* layout, | |
57b2284c | 4048 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4049 | Output_data_space* got_irelative, |
4050 | bool dyn) | |
4051 | { | |
4052 | if (dyn) | |
4053 | return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative); | |
4054 | else | |
4055 | return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative); | |
4056 | } | |
4057 | ||
93f8221c RM |
4058 | virtual std::string |
4059 | do_code_fill(section_size_type length) const; | |
4060 | ||
2e702c99 RM |
4061 | private: |
4062 | static const Target::Target_info i386_nacl_info; | |
4063 | }; | |
4064 | ||
4065 | const Target::Target_info Target_i386_nacl::i386_nacl_info = | |
4066 | { | |
4067 | 32, // size | |
4068 | false, // is_big_endian | |
4069 | elfcpp::EM_386, // machine_code | |
4070 | false, // has_make_symbol | |
4071 | false, // has_resolve | |
4072 | true, // has_code_fill | |
4073 | true, // is_default_stack_executable | |
4074 | true, // can_icf_inline_merge_sections | |
4075 | '\0', // wrap_char | |
4076 | "/lib/ld-nacl-x86-32.so.1", // dynamic_linker | |
4077 | 0x20000, // default_text_segment_address | |
4078 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4079 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4080 | true, // isolate_execinstr | |
4081 | 0x10000000, // rosegment_gap | |
4082 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4083 | elfcpp::SHN_UNDEF, // large_common_shndx | |
4084 | 0, // small_common_section_flags | |
4085 | 0, // large_common_section_flags | |
4086 | NULL, // attributes_section | |
a67858e0 | 4087 | NULL, // attributes_vendor |
8d9743bd MK |
4088 | "_start", // entry_symbol_name |
4089 | 32, // hash_entry_size | |
2e702c99 RM |
4090 | }; |
4091 | ||
4092 | #define NACLMASK 0xe0 // 32-byte alignment mask | |
4093 | ||
4094 | const unsigned char | |
4095 | Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] = | |
4096 | { | |
4097 | 0xff, 0x35, // pushl contents of memory address | |
4098 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
4099 | 0x8b, 0x0d, // movl contents of address, %ecx | |
4100 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4101 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4102 | 0xff, 0xe1, // jmp *%ecx | |
4103 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4104 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4105 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4106 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4107 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4108 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4109 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4110 | 0x90, 0x90, 0x90, 0x90, 0x90 | |
4111 | }; | |
4112 | ||
4113 | void | |
4114 | Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry( | |
4115 | unsigned char* pov, | |
4116 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
4117 | { | |
4118 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4119 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
4120 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
4121 | } | |
4122 | ||
4123 | // The first entry in the PLT for a shared object. | |
4124 | ||
4125 | const unsigned char | |
4126 | Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] = | |
4127 | { | |
4128 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
4129 | 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx | |
4130 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4131 | 0xff, 0xe1, // jmp *%ecx | |
4132 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4133 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4134 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4135 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4136 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4137 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4138 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4139 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4140 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4141 | 0x90, 0x90, 0x90, 0x90, 0x90 // nops | |
4142 | }; | |
4143 | ||
4144 | void | |
4145 | Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry( | |
4146 | unsigned char* pov, | |
4147 | elfcpp::Elf_types<32>::Elf_Addr) | |
4148 | { | |
4149 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4150 | } | |
4151 | ||
4152 | // Subsequent entries in the PLT for an executable. | |
4153 | ||
4154 | const unsigned char | |
4155 | Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] = | |
4156 | { | |
4157 | 0x8b, 0x0d, // movl contents of address, %ecx */ | |
4158 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4159 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4160 | 0xff, 0xe1, // jmp *%ecx | |
4161 | ||
4162 | // Pad to the next 32-byte boundary with nop instructions. | |
4163 | 0x90, | |
4164 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4165 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4166 | ||
4167 | // Lazy GOT entries point here (32-byte aligned). | |
4168 | 0x68, // pushl immediate | |
4169 | 0, 0, 0, 0, // replaced with offset into relocation table | |
4170 | 0xe9, // jmp relative | |
4171 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
4172 | ||
4173 | // Pad to the next 32-byte boundary with nop instructions. | |
4174 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4175 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4176 | 0x90, 0x90 | |
4177 | }; | |
4178 | ||
4179 | unsigned int | |
4180 | Output_data_plt_i386_nacl_exec::do_fill_plt_entry( | |
4181 | unsigned char* pov, | |
4182 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4183 | unsigned int got_offset, | |
4184 | unsigned int plt_offset, | |
4185 | unsigned int plt_rel_offset) | |
4186 | { | |
4187 | memcpy(pov, plt_entry, plt_entry_size); | |
4188 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4189 | got_address + got_offset); | |
4190 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4191 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4192 | return 32; | |
4193 | } | |
4194 | ||
4195 | // Subsequent entries in the PLT for a shared object. | |
4196 | ||
4197 | const unsigned char | |
4198 | Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] = | |
4199 | { | |
4200 | 0x8b, 0x8b, // movl offset(%ebx), %ecx | |
4201 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
4202 | 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx | |
4203 | 0xff, 0xe1, // jmp *%ecx | |
4204 | ||
4205 | // Pad to the next 32-byte boundary with nop instructions. | |
4206 | 0x90, | |
4207 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4208 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4209 | ||
4210 | // Lazy GOT entries point here (32-byte aligned). | |
4211 | 0x68, // pushl immediate | |
4212 | 0, 0, 0, 0, // replaced with offset into relocation table. | |
4213 | 0xe9, // jmp relative | |
4214 | 0, 0, 0, 0, // replaced with offset to start of .plt. | |
4215 | ||
4216 | // Pad to the next 32-byte boundary with nop instructions. | |
4217 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4218 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4219 | 0x90, 0x90 | |
4220 | }; | |
4221 | ||
4222 | unsigned int | |
4223 | Output_data_plt_i386_nacl_dyn::do_fill_plt_entry( | |
4224 | unsigned char* pov, | |
4225 | elfcpp::Elf_types<32>::Elf_Addr, | |
4226 | unsigned int got_offset, | |
4227 | unsigned int plt_offset, | |
4228 | unsigned int plt_rel_offset) | |
4229 | { | |
4230 | memcpy(pov, plt_entry, plt_entry_size); | |
4231 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
4232 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4233 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4234 | return 32; | |
4235 | } | |
4236 | ||
4237 | const unsigned char | |
4238 | Output_data_plt_i386_nacl::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4239 | { | |
4240 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4241 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4242 | 0, // Augmentation size. | |
4243 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
4244 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4245 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
4246 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4247 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4248 | 13, // Block length. | |
4249 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
4250 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
4251 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4252 | elfcpp::DW_OP_and, // & (%eip & 0x3f). | |
4253 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4254 | elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25) | |
4255 | elfcpp::DW_OP_lit2, // Push 2. | |
4256 | elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2) | |
4257 | elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4 | |
4258 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4259 | elfcpp::DW_CFA_nop | |
4260 | }; | |
4261 | ||
93f8221c RM |
4262 | // Return a string used to fill a code section with nops. |
4263 | // For NaCl, long NOPs are only valid if they do not cross | |
4264 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
4265 | std::string | |
4266 | Target_i386_nacl::do_code_fill(section_size_type length) const | |
4267 | { | |
4268 | return std::string(length, static_cast<char>(0x90)); | |
4269 | } | |
4270 | ||
2e702c99 RM |
4271 | // The selector for i386-nacl object files. |
4272 | ||
4273 | class Target_selector_i386_nacl | |
4274 | : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl> | |
4275 | { | |
4276 | public: | |
4277 | Target_selector_i386_nacl() | |
4278 | : Target_selector_nacl<Target_selector_i386, | |
4279 | Target_i386_nacl>("x86-32", | |
4280 | "elf32-i386-nacl", | |
4281 | "elf_i386_nacl") | |
4282 | { } | |
4283 | }; | |
4284 | ||
4285 | Target_selector_i386_nacl target_selector_i386; | |
14bfc3f5 | 4286 | |
01f573ad L |
4287 | // IAMCU variant. It uses EM_IAMCU, not EM_386. |
4288 | ||
4289 | class Target_iamcu : public Target_i386 | |
4290 | { | |
4291 | public: | |
4292 | Target_iamcu() | |
4293 | : Target_i386(&iamcu_info) | |
4294 | { } | |
4295 | ||
4296 | private: | |
4297 | // Information about this specific target which we pass to the | |
4298 | // general Target structure. | |
4299 | static const Target::Target_info iamcu_info; | |
4300 | }; | |
4301 | ||
4302 | const Target::Target_info Target_iamcu::iamcu_info = | |
4303 | { | |
4304 | 32, // size | |
4305 | false, // is_big_endian | |
4306 | elfcpp::EM_IAMCU, // machine_code | |
4307 | false, // has_make_symbol | |
4308 | false, // has_resolve | |
4309 | true, // has_code_fill | |
4310 | true, // is_default_stack_executable | |
4311 | true, // can_icf_inline_merge_sections | |
4312 | '\0', // wrap_char | |
4313 | "/usr/lib/libc.so.1", // dynamic_linker | |
4314 | 0x08048000, // default_text_segment_address | |
4315 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
4316 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
4317 | false, // isolate_execinstr | |
4318 | 0, // rosegment_gap | |
4319 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4320 | elfcpp::SHN_UNDEF, // large_common_shndx | |
4321 | 0, // small_common_section_flags | |
4322 | 0, // large_common_section_flags | |
4323 | NULL, // attributes_section | |
4324 | NULL, // attributes_vendor | |
8d9743bd MK |
4325 | "_start", // entry_symbol_name |
4326 | 32, // hash_entry_size | |
01f573ad L |
4327 | }; |
4328 | ||
4329 | class Target_selector_iamcu : public Target_selector | |
4330 | { | |
4331 | public: | |
4332 | Target_selector_iamcu() | |
4333 | : Target_selector(elfcpp::EM_IAMCU, 32, false, "elf32-iamcu", | |
4334 | "elf_iamcu") | |
4335 | { } | |
4336 | ||
4337 | Target* | |
4338 | do_instantiate_target() | |
4339 | { return new Target_iamcu(); } | |
4340 | }; | |
4341 | ||
4342 | Target_selector_iamcu target_selector_iamcu; | |
4343 | ||
14bfc3f5 | 4344 | } // End anonymous namespace. |