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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
6f2750fe | 3 | // Copyright (C) 2006-2016 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 | ||
4d625b70 CC |
432 | // Scan the relocs for --emit-relocs. |
433 | void | |
434 | emit_relocs_scan(Symbol_table* symtab, | |
435 | Layout* layout, | |
436 | Sized_relobj_file<32, false>* object, | |
437 | unsigned int data_shndx, | |
438 | unsigned int sh_type, | |
439 | const unsigned char* prelocs, | |
440 | size_t reloc_count, | |
441 | Output_section* output_section, | |
442 | bool needs_special_offset_handling, | |
443 | size_t local_symbol_count, | |
444 | const unsigned char* plocal_syms, | |
445 | Relocatable_relocs* rr); | |
446 | ||
7404fe1b | 447 | // Emit relocations for a section. |
6a74a719 | 448 | void |
7404fe1b AM |
449 | relocate_relocs(const Relocate_info<32, false>*, |
450 | unsigned int sh_type, | |
451 | const unsigned char* prelocs, | |
452 | size_t reloc_count, | |
453 | Output_section* output_section, | |
cc928013 | 454 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
7404fe1b AM |
455 | unsigned char* view, |
456 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
457 | section_size_type view_size, | |
458 | unsigned char* reloc_view, | |
459 | section_size_type reloc_view_size); | |
6a74a719 | 460 | |
c51e6221 ILT |
461 | // Return a string used to fill a code section with nops. |
462 | std::string | |
8851ecca | 463 | do_code_fill(section_size_type length) const; |
c51e6221 | 464 | |
9a2d6984 ILT |
465 | // Return whether SYM is defined by the ABI. |
466 | bool | |
9c2d0ef9 | 467 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
468 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
469 | ||
bb04269c DK |
470 | // Return whether a symbol name implies a local label. The UnixWare |
471 | // 2.1 cc generates temporary symbols that start with .X, so we | |
472 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
473 | // If so, we should move the .X recognition into | |
474 | // Target::do_is_local_label_name. | |
475 | bool | |
476 | do_is_local_label_name(const char* name) const | |
477 | { | |
478 | if (name[0] == '.' && name[1] == 'X') | |
479 | return true; | |
480 | return Target::do_is_local_label_name(name); | |
481 | } | |
482 | ||
67181c72 ILT |
483 | // Return the PLT address to use for a global symbol. |
484 | uint64_t | |
485 | do_plt_address_for_global(const Symbol* gsym) const | |
486 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 487 | |
67181c72 ILT |
488 | uint64_t |
489 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
490 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 491 | |
b3ce541e ILT |
492 | // We can tell whether we take the address of a function. |
493 | inline bool | |
494 | do_can_check_for_function_pointers() const | |
495 | { return true; } | |
496 | ||
02d7cd44 ILT |
497 | // Return the base for a DW_EH_PE_datarel encoding. |
498 | uint64_t | |
499 | do_ehframe_datarel_base() const; | |
500 | ||
b6848d3c ILT |
501 | // Return whether SYM is call to a non-split function. |
502 | bool | |
4d625b70 | 503 | do_is_call_to_non_split(const Symbol* sym, const unsigned char*) const; |
b6848d3c | 504 | |
9b547ce6 | 505 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
506 | void |
507 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
508 | section_offset_type fnoffset, section_size_type fnsize, | |
6e0813d3 | 509 | const unsigned char* prelocs, size_t reloc_count, |
364c7fa5 ILT |
510 | unsigned char* view, section_size_type view_size, |
511 | std::string* from, std::string* to) const; | |
512 | ||
96f2030e | 513 | // Return the size of the GOT section. |
fe8718a4 | 514 | section_size_type |
0e70b911 | 515 | got_size() const |
96f2030e ILT |
516 | { |
517 | gold_assert(this->got_ != NULL); | |
518 | return this->got_->data_size(); | |
519 | } | |
520 | ||
0e70b911 CC |
521 | // Return the number of entries in the GOT. |
522 | unsigned int | |
523 | got_entry_count() const | |
524 | { | |
525 | if (this->got_ == NULL) | |
526 | return 0; | |
527 | return this->got_size() / 4; | |
528 | } | |
529 | ||
530 | // Return the number of entries in the PLT. | |
531 | unsigned int | |
532 | plt_entry_count() const; | |
533 | ||
534 | // Return the offset of the first non-reserved PLT entry. | |
535 | unsigned int | |
536 | first_plt_entry_offset() const; | |
537 | ||
538 | // Return the size of each PLT entry. | |
539 | unsigned int | |
540 | plt_entry_size() const; | |
541 | ||
2e702c99 RM |
542 | protected: |
543 | // Instantiate the plt_ member. | |
544 | // This chooses the right PLT flavor for an executable or a shared object. | |
545 | Output_data_plt_i386* | |
546 | make_data_plt(Layout* layout, | |
57b2284c | 547 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
548 | Output_data_space* got_irelative, |
549 | bool dyn) | |
550 | { return this->do_make_data_plt(layout, got_plt, got_irelative, dyn); } | |
551 | ||
552 | virtual Output_data_plt_i386* | |
553 | do_make_data_plt(Layout* layout, | |
57b2284c | 554 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
555 | Output_data_space* got_irelative, |
556 | bool dyn) | |
557 | { | |
558 | if (dyn) | |
559 | return new Output_data_plt_i386_dyn(layout, got_plt, got_irelative); | |
560 | else | |
561 | return new Output_data_plt_i386_exec(layout, got_plt, got_irelative); | |
562 | } | |
563 | ||
92e059d8 ILT |
564 | private: |
565 | // The class which scans relocations. | |
566 | struct Scan | |
61ba1cf9 | 567 | { |
95a2c8d6 RS |
568 | static inline int |
569 | ||
570 | get_reference_flags(unsigned int r_type); | |
571 | ||
61ba1cf9 | 572 | inline void |
ad0f2072 | 573 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 574 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 575 | unsigned int data_shndx, |
07f397ab | 576 | Output_section* output_section, |
92e059d8 | 577 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
578 | const elfcpp::Sym<32, false>& lsym, |
579 | bool is_discarded); | |
61ba1cf9 | 580 | |
92e059d8 | 581 | inline void |
ad0f2072 | 582 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 583 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 584 | unsigned int data_shndx, |
07f397ab | 585 | Output_section* output_section, |
92e059d8 ILT |
586 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
587 | Symbol* gsym); | |
af6359d5 | 588 | |
21bb3914 | 589 | inline bool |
0897ed3b | 590 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
2e702c99 RM |
591 | Target_i386* target, |
592 | Sized_relobj_file<32, false>* object, | |
593 | unsigned int data_shndx, | |
594 | Output_section* output_section, | |
595 | const elfcpp::Rel<32, false>& reloc, | |
0897ed3b | 596 | unsigned int r_type, |
2e702c99 | 597 | const elfcpp::Sym<32, false>& lsym); |
0897ed3b ST |
598 | |
599 | inline bool | |
600 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
601 | Target_i386* target, | |
2e702c99 RM |
602 | Sized_relobj_file<32, false>* object, |
603 | unsigned int data_shndx, | |
604 | Output_section* output_section, | |
0897ed3b ST |
605 | const elfcpp::Rel<32, false>& reloc, |
606 | unsigned int r_type, | |
2e702c99 | 607 | Symbol* gsym); |
21bb3914 ST |
608 | |
609 | inline bool | |
0897ed3b | 610 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 611 | |
7223e9ca | 612 | bool |
6fa2a40b CC |
613 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
614 | unsigned int r_type); | |
7223e9ca | 615 | |
af6359d5 | 616 | static void |
6fa2a40b | 617 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
618 | |
619 | static void | |
6fa2a40b | 620 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 621 | Symbol*); |
61ba1cf9 ILT |
622 | }; |
623 | ||
92e059d8 ILT |
624 | // The class which implements relocation. |
625 | class Relocate | |
626 | { | |
627 | public: | |
ead1e424 | 628 | Relocate() |
46cf9fa2 | 629 | : skip_call_tls_get_addr_(false), |
82bb573a | 630 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
631 | { } |
632 | ||
633 | ~Relocate() | |
634 | { | |
635 | if (this->skip_call_tls_get_addr_) | |
636 | { | |
637 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 638 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
639 | } |
640 | } | |
641 | ||
86849f1f ILT |
642 | // Return whether the static relocation needs to be applied. |
643 | inline bool | |
644 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
645 | unsigned int r_type, |
646 | bool is_32bit, | |
031cdbed | 647 | Output_section* output_section); |
86849f1f | 648 | |
ead1e424 ILT |
649 | // Do a relocation. Return false if the caller should not issue |
650 | // any warnings about this relocation. | |
651 | inline bool | |
91a65d2f AM |
652 | relocate(const Relocate_info<32, false>*, unsigned int, |
653 | Target_i386*, Output_section*, size_t, const unsigned char*, | |
654 | const Sized_symbol<32>*, const Symbol_value<32>*, | |
92e059d8 | 655 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 656 | section_size_type); |
92e059d8 ILT |
657 | |
658 | private: | |
659 | // Do a TLS relocation. | |
ead1e424 | 660 | inline void |
07f397ab | 661 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
2e702c99 | 662 | size_t relnum, const elfcpp::Rel<32, false>&, |
c06b7b0b | 663 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 664 | const Symbol_value<32>*, |
fe8718a4 ILT |
665 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
666 | section_size_type); | |
92e059d8 | 667 | |
07f397ab ILT |
668 | // Do a TLS General-Dynamic to Initial-Exec transition. |
669 | inline void | |
670 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
07f397ab ILT |
671 | const elfcpp::Rel<32, false>&, unsigned int r_type, |
672 | elfcpp::Elf_types<32>::Elf_Addr value, | |
673 | unsigned char* view, | |
fe8718a4 | 674 | section_size_type view_size); |
07f397ab | 675 | |
56622147 ILT |
676 | // Do a TLS General-Dynamic to Local-Exec transition. |
677 | inline void | |
678 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
679 | Output_segment* tls_segment, |
680 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
681 | elfcpp::Elf_types<32>::Elf_Addr value, | |
682 | unsigned char* view, | |
fe8718a4 | 683 | section_size_type view_size); |
92e059d8 | 684 | |
c2b45e22 CC |
685 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
686 | // transition. | |
687 | inline void | |
688 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
c2b45e22 CC |
689 | const elfcpp::Rel<32, false>&, unsigned int r_type, |
690 | elfcpp::Elf_types<32>::Elf_Addr value, | |
691 | unsigned char* view, | |
692 | section_size_type view_size); | |
693 | ||
694 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
695 | // transition. | |
696 | inline void | |
697 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
698 | Output_segment* tls_segment, | |
699 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
700 | elfcpp::Elf_types<32>::Elf_Addr value, | |
701 | unsigned char* view, | |
702 | section_size_type view_size); | |
703 | ||
56622147 | 704 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 705 | inline void |
56622147 | 706 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
707 | Output_segment* tls_segment, |
708 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
709 | elfcpp::Elf_types<32>::Elf_Addr value, | |
710 | unsigned char* view, | |
fe8718a4 | 711 | section_size_type view_size); |
ead1e424 | 712 | |
56622147 ILT |
713 | // Do a TLS Initial-Exec to Local-Exec transition. |
714 | static inline void | |
715 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
716 | Output_segment* tls_segment, |
717 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
718 | elfcpp::Elf_types<32>::Elf_Addr value, | |
719 | unsigned char* view, | |
fe8718a4 | 720 | section_size_type view_size); |
46cf9fa2 | 721 | |
46cf9fa2 ILT |
722 | // We need to keep track of which type of local dynamic relocation |
723 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
724 | enum Local_dynamic_type | |
725 | { | |
726 | LOCAL_DYNAMIC_NONE, | |
727 | LOCAL_DYNAMIC_SUN, | |
728 | LOCAL_DYNAMIC_GNU | |
729 | }; | |
730 | ||
ead1e424 ILT |
731 | // This is set if we should skip the next reloc, which should be a |
732 | // PLT32 reloc against ___tls_get_addr. | |
733 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
734 | // The type of local dynamic relocation we have seen in the section |
735 | // being relocated, if any. | |
736 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
737 | }; |
738 | ||
4d625b70 CC |
739 | // A class for inquiring about properties of a relocation, |
740 | // used while scanning relocs during a relocatable link and | |
741 | // garbage collection. | |
742 | class Classify_reloc : | |
743 | public gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false> | |
6a74a719 ILT |
744 | { |
745 | public: | |
41549dfb | 746 | typedef Reloc_types<elfcpp::SHT_REL, 32, false>::Reloc Reltype; |
8a8880cb CC |
747 | |
748 | // Return the explicit addend of the relocation (return 0 for SHT_REL). | |
41549dfb | 749 | static elfcpp::Elf_types<32>::Elf_Swxword |
8a8880cb CC |
750 | get_r_addend(const Reltype*) |
751 | { return 0; } | |
752 | ||
4d625b70 CC |
753 | // Return the size of the addend of the relocation (only used for SHT_REL). |
754 | static unsigned int | |
6a74a719 ILT |
755 | get_size_for_reloc(unsigned int, Relobj*); |
756 | }; | |
757 | ||
92e059d8 ILT |
758 | // Adjust TLS relocation type based on the options and whether this |
759 | // is a local symbol. | |
af6359d5 | 760 | static tls::Tls_optimization |
7e1edb90 | 761 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 762 | |
c4fc4724 IT |
763 | // Check if relocation against this symbol is a candidate for |
764 | // conversion from | |
765 | // mov foo@GOT(%reg), %reg | |
766 | // to | |
767 | // lea foo@GOTOFF(%reg), %reg. | |
768 | static bool | |
769 | can_convert_mov_to_lea(const Symbol* gsym) | |
770 | { | |
771 | gold_assert(gsym != NULL); | |
772 | return (gsym->type() != elfcpp::STT_GNU_IFUNC | |
773 | && !gsym->is_undefined () | |
774 | && !gsym->is_from_dynobj() | |
775 | && !gsym->is_preemptible() | |
776 | && (!parameters->options().shared() | |
777 | || (gsym->visibility() != elfcpp::STV_DEFAULT | |
778 | && gsym->visibility() != elfcpp::STV_PROTECTED) | |
779 | || parameters->options().Bsymbolic()) | |
780 | && strcmp(gsym->name(), "_DYNAMIC") != 0); | |
781 | } | |
782 | ||
ead1e424 | 783 | // Get the GOT section, creating it if necessary. |
dbe717ef | 784 | Output_data_got<32, false>* |
7e1edb90 | 785 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 786 | |
96f2030e | 787 | // Get the GOT PLT section. |
57b2284c | 788 | Output_data_got_plt_i386* |
96f2030e ILT |
789 | got_plt_section() const |
790 | { | |
791 | gold_assert(this->got_plt_ != NULL); | |
792 | return this->got_plt_; | |
793 | } | |
794 | ||
a8df5856 ILT |
795 | // Get the GOT section for TLSDESC entries. |
796 | Output_data_got<32, false>* | |
797 | got_tlsdesc_section() const | |
798 | { | |
799 | gold_assert(this->got_tlsdesc_ != NULL); | |
800 | return this->got_tlsdesc_; | |
801 | } | |
802 | ||
7223e9ca ILT |
803 | // Create the PLT section. |
804 | void | |
805 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
806 | ||
a3ad94ed ILT |
807 | // Create a PLT entry for a global symbol. |
808 | void | |
7e1edb90 | 809 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 810 | |
7223e9ca ILT |
811 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
812 | void | |
813 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 814 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
815 | unsigned int local_sym_index); |
816 | ||
9fa33bee | 817 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
818 | void |
819 | define_tls_base_symbol(Symbol_table*, Layout*); | |
820 | ||
94c4710f ILT |
821 | // Create a GOT entry for the TLS module index. |
822 | unsigned int | |
823 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 824 | Sized_relobj_file<32, false>* object); |
94c4710f | 825 | |
a3ad94ed | 826 | // Get the PLT section. |
e291e7b9 | 827 | Output_data_plt_i386* |
a3ad94ed ILT |
828 | plt_section() const |
829 | { | |
830 | gold_assert(this->plt_ != NULL); | |
831 | return this->plt_; | |
832 | } | |
833 | ||
5a6f7e2d ILT |
834 | // Get the dynamic reloc section, creating it if necessary. |
835 | Reloc_section* | |
836 | rel_dyn_section(Layout*); | |
837 | ||
e291e7b9 ILT |
838 | // Get the section to use for TLS_DESC relocations. |
839 | Reloc_section* | |
840 | rel_tls_desc_section(Layout*) const; | |
841 | ||
67181c72 ILT |
842 | // Get the section to use for IRELATIVE relocations. |
843 | Reloc_section* | |
844 | rel_irelative_section(Layout*); | |
845 | ||
12c0daef | 846 | // Add a potential copy relocation. |
a3ad94ed | 847 | void |
ef9beddf | 848 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 849 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
850 | unsigned int shndx, Output_section* output_section, |
851 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
852 | { | |
859d7987 | 853 | unsigned int r_type = elfcpp::elf_r_type<32>(reloc.get_r_info()); |
12c0daef ILT |
854 | this->copy_relocs_.copy_reloc(symtab, layout, |
855 | symtab->get_sized_symbol<32>(sym), | |
859d7987 CC |
856 | object, shndx, output_section, |
857 | r_type, reloc.get_r_offset(), 0, | |
12c0daef ILT |
858 | this->rel_dyn_section(layout)); |
859 | } | |
ead1e424 | 860 | |
92e059d8 ILT |
861 | // Information about this specific target which we pass to the |
862 | // general Target structure. | |
75f65a3e | 863 | static const Target::Target_info i386_info; |
ead1e424 | 864 | |
0a65a3a7 | 865 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
866 | // These values are exposed to the ABI in an incremental link. |
867 | // Do not renumber existing values without changing the version | |
868 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
869 | enum Got_type |
870 | { | |
871 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
872 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
873 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
874 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
875 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
876 | }; |
877 | ||
ead1e424 | 878 | // The GOT section. |
dbe717ef | 879 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
880 | // The PLT section. |
881 | Output_data_plt_i386* plt_; | |
882 | // The GOT PLT section. | |
57b2284c | 883 | Output_data_got_plt_i386* got_plt_; |
67181c72 ILT |
884 | // The GOT section for IRELATIVE relocations. |
885 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
886 | // The GOT section for TLSDESC relocations. |
887 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
888 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
889 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
890 | // The dynamic reloc section. |
891 | Reloc_section* rel_dyn_; | |
67181c72 ILT |
892 | // The section to use for IRELATIVE relocs. |
893 | Reloc_section* rel_irelative_; | |
5a6f7e2d | 894 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 895 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
c2b45e22 | 896 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 897 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
898 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
899 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
900 | }; |
901 | ||
902 | const Target::Target_info Target_i386::i386_info = | |
903 | { | |
61ba1cf9 ILT |
904 | 32, // size |
905 | false, // is_big_endian | |
906 | elfcpp::EM_386, // machine_code | |
907 | false, // has_make_symbol | |
dbe717ef | 908 | false, // has_resolve |
c51e6221 | 909 | true, // has_code_fill |
35cdfc9a | 910 | true, // is_default_stack_executable |
b3ce541e | 911 | true, // can_icf_inline_merge_sections |
0864d551 | 912 | '\0', // wrap_char |
dbe717ef | 913 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 914 | 0x08048000, // default_text_segment_address |
cd72c291 | 915 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 916 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
917 | false, // isolate_execinstr |
918 | 0, // rosegment_gap | |
8a5e3e08 ILT |
919 | elfcpp::SHN_UNDEF, // small_common_shndx |
920 | elfcpp::SHN_UNDEF, // large_common_shndx | |
921 | 0, // small_common_section_flags | |
05a352e6 DK |
922 | 0, // large_common_section_flags |
923 | NULL, // attributes_section | |
a67858e0 | 924 | NULL, // attributes_vendor |
8d9743bd MK |
925 | "_start", // entry_symbol_name |
926 | 32, // hash_entry_size | |
14bfc3f5 ILT |
927 | }; |
928 | ||
ead1e424 ILT |
929 | // Get the GOT section, creating it if necessary. |
930 | ||
dbe717ef | 931 | Output_data_got<32, false>* |
7e1edb90 | 932 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
933 | { |
934 | if (this->got_ == NULL) | |
935 | { | |
7e1edb90 | 936 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 937 | |
7e1edb90 | 938 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 939 | |
9446efde ILT |
940 | // When using -z now, we can treat .got.plt as a relro section. |
941 | // Without -z now, it is modified after program startup by lazy | |
942 | // PLT relocations. | |
943 | bool is_got_plt_relro = parameters->options().now(); | |
944 | Output_section_order got_order = (is_got_plt_relro | |
945 | ? ORDER_RELRO | |
946 | : ORDER_RELRO_LAST); | |
947 | Output_section_order got_plt_order = (is_got_plt_relro | |
948 | ? ORDER_RELRO | |
949 | : ORDER_NON_RELRO_FIRST); | |
950 | ||
82742395 ILT |
951 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
952 | (elfcpp::SHF_ALLOC | |
953 | | elfcpp::SHF_WRITE), | |
9446efde | 954 | this->got_, got_order, true); |
ead1e424 | 955 | |
57b2284c | 956 | this->got_plt_ = new Output_data_got_plt_i386(layout); |
82742395 ILT |
957 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
958 | (elfcpp::SHF_ALLOC | |
959 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
960 | this->got_plt_, got_plt_order, |
961 | is_got_plt_relro); | |
a3ad94ed | 962 | |
ead1e424 | 963 | // The first three entries are reserved. |
27bc2bce | 964 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 965 | |
9446efde ILT |
966 | if (!is_got_plt_relro) |
967 | { | |
968 | // Those bytes can go into the relro segment. | |
969 | layout->increase_relro(3 * 4); | |
970 | } | |
1a2dff53 | 971 | |
a3ad94ed | 972 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
973 | this->global_offset_table_ = |
974 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
975 | Symbol_table::PREDEFINED, | |
976 | this->got_plt_, | |
977 | 0, 0, elfcpp::STT_OBJECT, | |
978 | elfcpp::STB_LOCAL, | |
979 | elfcpp::STV_HIDDEN, 0, | |
980 | false, false); | |
a8df5856 | 981 | |
67181c72 ILT |
982 | // If there are any IRELATIVE relocations, they get GOT entries |
983 | // in .got.plt after the jump slot relocations. | |
984 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
985 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
986 | (elfcpp::SHF_ALLOC | |
987 | | elfcpp::SHF_WRITE), | |
988 | this->got_irelative_, | |
9446efde | 989 | got_plt_order, is_got_plt_relro); |
67181c72 | 990 | |
a8df5856 ILT |
991 | // If there are any TLSDESC relocations, they get GOT entries in |
992 | // .got.plt after the jump slot entries. | |
993 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
994 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
995 | (elfcpp::SHF_ALLOC | |
996 | | elfcpp::SHF_WRITE), | |
22f0da72 | 997 | this->got_tlsdesc_, |
9446efde | 998 | got_plt_order, is_got_plt_relro); |
ead1e424 | 999 | } |
a3ad94ed | 1000 | |
ead1e424 ILT |
1001 | return this->got_; |
1002 | } | |
1003 | ||
5a6f7e2d ILT |
1004 | // Get the dynamic reloc section, creating it if necessary. |
1005 | ||
1006 | Target_i386::Reloc_section* | |
1007 | Target_i386::rel_dyn_section(Layout* layout) | |
1008 | { | |
1009 | if (this->rel_dyn_ == NULL) | |
1010 | { | |
1011 | gold_assert(layout != NULL); | |
d98bc257 | 1012 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 1013 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
1014 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
1015 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
1016 | } |
1017 | return this->rel_dyn_; | |
1018 | } | |
1019 | ||
67181c72 ILT |
1020 | // Get the section to use for IRELATIVE relocs, creating it if |
1021 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
1022 | // relocations. They need to follow the other dynamic relocations so | |
1023 | // that they can refer to global variables initialized by those | |
1024 | // relocs. | |
1025 | ||
1026 | Target_i386::Reloc_section* | |
1027 | Target_i386::rel_irelative_section(Layout* layout) | |
1028 | { | |
1029 | if (this->rel_irelative_ == NULL) | |
1030 | { | |
1031 | // Make sure we have already create the dynamic reloc section. | |
1032 | this->rel_dyn_section(layout); | |
1033 | this->rel_irelative_ = new Reloc_section(false); | |
1034 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1035 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
1036 | ORDER_DYNAMIC_RELOCS, false); | |
1037 | gold_assert(this->rel_dyn_->output_section() | |
1038 | == this->rel_irelative_->output_section()); | |
1039 | } | |
1040 | return this->rel_irelative_; | |
1041 | } | |
1042 | ||
57b2284c CC |
1043 | // Write the first three reserved words of the .got.plt section. |
1044 | // The remainder of the section is written while writing the PLT | |
1045 | // in Output_data_plt_i386::do_write. | |
1046 | ||
1047 | void | |
1048 | Output_data_got_plt_i386::do_write(Output_file* of) | |
1049 | { | |
1050 | // The first entry in the GOT is the address of the .dynamic section | |
1051 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1052 | // We saved space for them when we created the section in | |
1053 | // Target_i386::got_section. | |
1054 | const off_t got_file_offset = this->offset(); | |
1055 | gold_assert(this->data_size() >= 12); | |
1056 | unsigned char* const got_view = of->get_output_view(got_file_offset, 12); | |
1057 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1058 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1059 | elfcpp::Swap<32, false>::writeval(got_view, dynamic_addr); | |
1060 | memset(got_view + 4, 0, 8); | |
1061 | of->write_output_view(got_file_offset, 12, got_view); | |
1062 | } | |
1063 | ||
a3ad94ed ILT |
1064 | // Create the PLT section. The ordinary .got section is an argument, |
1065 | // since we need to refer to the start. We also create our own .got | |
1066 | // section just for PLT entries. | |
1067 | ||
67181c72 | 1068 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
2e702c99 | 1069 | uint64_t addralign, |
57b2284c | 1070 | Output_data_got_plt_i386* got_plt, |
67181c72 | 1071 | Output_data_space* got_irelative) |
2e702c99 | 1072 | : Output_section_data(addralign), |
57b2284c CC |
1073 | tls_desc_rel_(NULL), irelative_rel_(NULL), got_plt_(got_plt), |
1074 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
1075 | global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 1076 | { |
d98bc257 | 1077 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 1078 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
1079 | elfcpp::SHF_ALLOC, this->rel_, |
1080 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
a3ad94ed ILT |
1081 | } |
1082 | ||
16649710 ILT |
1083 | void |
1084 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
1085 | { | |
1086 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
1087 | // linker, and so do we. | |
1088 | os->set_entsize(4); | |
1089 | } | |
1090 | ||
a3ad94ed ILT |
1091 | // Add an entry to the PLT. |
1092 | ||
1093 | void | |
67181c72 ILT |
1094 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
1095 | Symbol* gsym) | |
a3ad94ed ILT |
1096 | { |
1097 | gold_assert(!gsym->has_plt_offset()); | |
1098 | ||
a3ad94ed | 1099 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
1100 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1101 | && gsym->can_use_relative_reloc(false)) | |
1102 | { | |
2e702c99 | 1103 | gsym->set_plt_offset(this->irelative_count_ * this->get_plt_entry_size()); |
67181c72 ILT |
1104 | ++this->irelative_count_; |
1105 | section_offset_type got_offset = | |
1106 | this->got_irelative_->current_data_size(); | |
1107 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
1108 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
1109 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
1110 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1111 | struct Global_ifunc gi; |
1112 | gi.sym = gsym; | |
1113 | gi.got_offset = got_offset; | |
1114 | this->global_ifuncs_.push_back(gi); | |
1115 | } | |
1116 | else | |
1117 | { | |
67181c72 ILT |
1118 | // When setting the PLT offset we skip the initial reserved PLT |
1119 | // entry. | |
2e702c99 | 1120 | gsym->set_plt_offset((this->count_ + 1) * this->get_plt_entry_size()); |
67181c72 ILT |
1121 | |
1122 | ++this->count_; | |
1123 | ||
1124 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
1125 | ||
1126 | // Every PLT entry needs a GOT entry which points back to the | |
1127 | // PLT entry (this will be changed by the dynamic linker, | |
1128 | // normally lazily when the function is called). | |
1129 | this->got_plt_->set_current_data_size(got_offset + 4); | |
1130 | ||
7223e9ca ILT |
1131 | gsym->set_needs_dynsym_entry(); |
1132 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
1133 | got_offset); | |
1134 | } | |
a3ad94ed ILT |
1135 | |
1136 | // Note that we don't need to save the symbol. The contents of the | |
1137 | // PLT are independent of which symbols are used. The symbols only | |
1138 | // appear in the relocations. | |
1139 | } | |
1140 | ||
7223e9ca ILT |
1141 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1142 | // the PLT offset. | |
1143 | ||
1144 | unsigned int | |
6fa2a40b | 1145 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
1146 | Symbol_table* symtab, |
1147 | Layout* layout, | |
6fa2a40b CC |
1148 | Sized_relobj_file<32, false>* relobj, |
1149 | unsigned int local_sym_index) | |
7223e9ca | 1150 | { |
2e702c99 | 1151 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1152 | ++this->irelative_count_; |
7223e9ca | 1153 | |
67181c72 | 1154 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1155 | |
1156 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1157 | // entry. | |
67181c72 | 1158 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
1159 | |
1160 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1161 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
1162 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
1163 | elfcpp::R_386_IRELATIVE, | |
1164 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1165 | |
1166 | struct Local_ifunc li; | |
1167 | li.object = relobj; | |
1168 | li.local_sym_index = local_sym_index; | |
1169 | li.got_offset = got_offset; | |
1170 | this->local_ifuncs_.push_back(li); | |
1171 | ||
1172 | return plt_offset; | |
1173 | } | |
1174 | ||
e291e7b9 ILT |
1175 | // Return where the TLS_DESC relocations should go, creating it if |
1176 | // necessary. These follow the JUMP_SLOT relocations. | |
1177 | ||
1178 | Output_data_plt_i386::Reloc_section* | |
1179 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
1180 | { | |
1181 | if (this->tls_desc_rel_ == NULL) | |
1182 | { | |
1183 | this->tls_desc_rel_ = new Reloc_section(false); | |
1184 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1185 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 1186 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1187 | gold_assert(this->tls_desc_rel_->output_section() |
1188 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1189 | } |
1190 | return this->tls_desc_rel_; | |
1191 | } | |
1192 | ||
67181c72 ILT |
1193 | // Return where the IRELATIVE relocations should go in the PLT. These |
1194 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
1195 | ||
1196 | Output_data_plt_i386::Reloc_section* | |
1197 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
1198 | { | |
1199 | if (this->irelative_rel_ == NULL) | |
1200 | { | |
1201 | // Make sure we have a place for the TLS_DESC relocations, in | |
1202 | // case we see any later on. | |
1203 | this->rel_tls_desc(layout); | |
1204 | this->irelative_rel_ = new Reloc_section(false); | |
1205 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1206 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1207 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1208 | gold_assert(this->irelative_rel_->output_section() | |
1209 | == this->rel_->output_section()); | |
1210 | ||
1211 | if (parameters->doing_static_link()) | |
1212 | { | |
1213 | // A statically linked executable will only have a .rel.plt | |
1214 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
1215 | // symbols. The library will use these symbols to locate | |
1216 | // the IRELATIVE relocs at program startup time. | |
1217 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
1218 | Symbol_table::PREDEFINED, | |
1219 | this->irelative_rel_, 0, 0, | |
1220 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1221 | elfcpp::STV_HIDDEN, 0, false, true); | |
1222 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
1223 | Symbol_table::PREDEFINED, | |
1224 | this->irelative_rel_, 0, 0, | |
1225 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1226 | elfcpp::STV_HIDDEN, 0, true, true); | |
1227 | } | |
1228 | } | |
1229 | return this->irelative_rel_; | |
1230 | } | |
1231 | ||
1232 | // Return the PLT address to use for a global symbol. | |
1233 | ||
1234 | uint64_t | |
1235 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
1236 | { | |
1237 | uint64_t offset = 0; | |
1238 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1239 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1240 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1241 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1242 | } |
1243 | ||
1244 | // Return the PLT address to use for a local symbol. These are always | |
1245 | // IRELATIVE relocs. | |
1246 | ||
1247 | uint64_t | |
19fec8c1 AM |
1248 | Output_data_plt_i386::address_for_local(const Relobj* object, |
1249 | unsigned int r_sym) | |
67181c72 | 1250 | { |
19fec8c1 AM |
1251 | return (this->address() |
1252 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1253 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1254 | } |
1255 | ||
a3ad94ed ILT |
1256 | // The first entry in the PLT for an executable. |
1257 | ||
2e702c99 | 1258 | const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1259 | { |
1260 | 0xff, 0x35, // pushl contents of memory address | |
1261 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1262 | 0xff, 0x25, // jmp indirect | |
1263 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1264 | 0, 0, 0, 0 // unused | |
1265 | }; | |
1266 | ||
2e702c99 RM |
1267 | void |
1268 | Output_data_plt_i386_exec::do_fill_first_plt_entry( | |
1269 | unsigned char* pov, | |
1270 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
1271 | { | |
1272 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1273 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1274 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1275 | } | |
1276 | ||
a3ad94ed ILT |
1277 | // The first entry in the PLT for a shared object. |
1278 | ||
2e702c99 | 1279 | const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1280 | { |
1281 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1282 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1283 | 0, 0, 0, 0 // unused | |
1284 | }; | |
1285 | ||
2e702c99 RM |
1286 | void |
1287 | Output_data_plt_i386_dyn::do_fill_first_plt_entry( | |
1288 | unsigned char* pov, | |
1289 | elfcpp::Elf_types<32>::Elf_Addr) | |
1290 | { | |
1291 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1292 | } | |
1293 | ||
a3ad94ed ILT |
1294 | // Subsequent entries in the PLT for an executable. |
1295 | ||
2e702c99 | 1296 | const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1297 | { |
1298 | 0xff, 0x25, // jmp indirect | |
1299 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1300 | 0x68, // pushl immediate | |
1301 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1302 | 0xe9, // jmp relative | |
1303 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1304 | }; | |
1305 | ||
2e702c99 RM |
1306 | unsigned int |
1307 | Output_data_plt_i386_exec::do_fill_plt_entry( | |
1308 | unsigned char* pov, | |
1309 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
1310 | unsigned int got_offset, | |
1311 | unsigned int plt_offset, | |
1312 | unsigned int plt_rel_offset) | |
1313 | { | |
1314 | memcpy(pov, plt_entry, plt_entry_size); | |
1315 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1316 | got_address + got_offset); | |
1317 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1318 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1319 | return 6; | |
1320 | } | |
1321 | ||
a3ad94ed ILT |
1322 | // Subsequent entries in the PLT for a shared object. |
1323 | ||
2e702c99 | 1324 | const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1325 | { |
1326 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1327 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1328 | 0x68, // pushl immediate | |
1329 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1330 | 0xe9, // jmp relative | |
1331 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1332 | }; | |
1333 | ||
2e702c99 RM |
1334 | unsigned int |
1335 | Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov, | |
1336 | elfcpp::Elf_types<32>::Elf_Addr, | |
1337 | unsigned int got_offset, | |
1338 | unsigned int plt_offset, | |
1339 | unsigned int plt_rel_offset) | |
1340 | { | |
1341 | memcpy(pov, plt_entry, plt_entry_size); | |
1342 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1343 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1344 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1345 | return 6; | |
1346 | } | |
1347 | ||
07a60597 ILT |
1348 | // The .eh_frame unwind information for the PLT. |
1349 | ||
1350 | const unsigned char | |
1351 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1352 | { | |
1353 | 1, // CIE version. | |
1354 | 'z', // Augmentation: augmentation size included. | |
1355 | 'R', // Augmentation: FDE encoding included. | |
1356 | '\0', // End of augmentation string. | |
1357 | 1, // Code alignment factor. | |
1358 | 0x7c, // Data alignment factor. | |
1359 | 8, // Return address column. | |
1360 | 1, // Augmentation size. | |
1361 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1362 | | elfcpp::DW_EH_PE_sdata4), | |
1363 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1364 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1365 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1366 | elfcpp::DW_CFA_nop | |
1367 | }; | |
1368 | ||
1369 | const unsigned char | |
2e702c99 | 1370 | Output_data_plt_i386_standard::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1371 | { |
1372 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1373 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1374 | 0, // Augmentation size. | |
1375 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1376 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1377 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1378 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1379 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1380 | 11, // Block length. | |
1381 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1382 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1383 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1384 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1385 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1386 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1387 | elfcpp::DW_OP_lit2, // Push 2. | |
1388 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1389 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1390 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1391 | elfcpp::DW_CFA_nop, | |
1392 | elfcpp::DW_CFA_nop, | |
1393 | elfcpp::DW_CFA_nop | |
1394 | }; | |
1395 | ||
a3ad94ed ILT |
1396 | // Write out the PLT. This uses the hand-coded instructions above, |
1397 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1398 | // Processor Supplement. | |
1399 | ||
1400 | void | |
1401 | Output_data_plt_i386::do_write(Output_file* of) | |
1402 | { | |
2ea97941 | 1403 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1404 | const section_size_type oview_size = |
1405 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1406 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1407 | |
1408 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1409 | gold_assert(parameters->incremental_update() |
1410 | || (got_file_offset + this->got_plt_->data_size() | |
1411 | == this->got_irelative_->offset())); | |
fe8718a4 | 1412 | const section_size_type got_size = |
67181c72 ILT |
1413 | convert_to_section_size_type(this->got_plt_->data_size() |
1414 | + this->got_irelative_->data_size()); | |
57b2284c | 1415 | |
a3ad94ed ILT |
1416 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1417 | got_size); | |
1418 | ||
1419 | unsigned char* pov = oview; | |
1420 | ||
1421 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1422 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1423 | ||
2e702c99 RM |
1424 | this->fill_first_plt_entry(pov, got_address); |
1425 | pov += this->get_plt_entry_size(); | |
a3ad94ed | 1426 | |
57b2284c CC |
1427 | // The first three entries in the GOT are reserved, and are written |
1428 | // by Output_data_got_plt_i386::do_write. | |
1429 | unsigned char* got_pov = got_view + 12; | |
a3ad94ed ILT |
1430 | |
1431 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1432 | ||
2e702c99 | 1433 | unsigned int plt_offset = this->get_plt_entry_size(); |
a3ad94ed ILT |
1434 | unsigned int plt_rel_offset = 0; |
1435 | unsigned int got_offset = 12; | |
67181c72 | 1436 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1437 | for (unsigned int i = 0; |
1438 | i < count; | |
1439 | ++i, | |
2e702c99 | 1440 | pov += this->get_plt_entry_size(), |
a3ad94ed | 1441 | got_pov += 4, |
2e702c99 | 1442 | plt_offset += this->get_plt_entry_size(), |
a3ad94ed ILT |
1443 | plt_rel_offset += rel_size, |
1444 | got_offset += 4) | |
1445 | { | |
1446 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1447 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1448 | got_address, | |
1449 | got_offset, | |
1450 | plt_offset, | |
1451 | plt_rel_offset); | |
a3ad94ed ILT |
1452 | |
1453 | // Set the entry in the GOT. | |
2e702c99 RM |
1454 | elfcpp::Swap<32, false>::writeval(got_pov, |
1455 | plt_address + plt_offset + lazy_offset); | |
a3ad94ed ILT |
1456 | } |
1457 | ||
7223e9ca ILT |
1458 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1459 | // the GOT to point to the actual symbol value, rather than point to | |
1460 | // the PLT entry. That will let the dynamic linker call the right | |
1461 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1462 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1463 | for (std::vector<Global_ifunc>::const_iterator p = |
1464 | this->global_ifuncs_.begin(); | |
1465 | p != this->global_ifuncs_.end(); | |
1466 | ++p) | |
1467 | { | |
1468 | const Sized_symbol<32>* ssym = | |
1469 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1470 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1471 | ssym->value()); |
1472 | } | |
1473 | ||
1474 | for (std::vector<Local_ifunc>::const_iterator p = | |
1475 | this->local_ifuncs_.begin(); | |
1476 | p != this->local_ifuncs_.end(); | |
1477 | ++p) | |
1478 | { | |
1479 | const Symbol_value<32>* psymval = | |
1480 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1481 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1482 | psymval->value(p->object, 0)); |
1483 | } | |
1484 | ||
fe8718a4 ILT |
1485 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1486 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1487 | |
2ea97941 | 1488 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1489 | of->write_output_view(got_file_offset, got_size, got_view); |
1490 | } | |
1491 | ||
7223e9ca | 1492 | // Create the PLT section. |
a3ad94ed ILT |
1493 | |
1494 | void | |
7223e9ca | 1495 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1496 | { |
a3ad94ed ILT |
1497 | if (this->plt_ == NULL) |
1498 | { | |
1499 | // Create the GOT sections first. | |
7e1edb90 | 1500 | this->got_section(symtab, layout); |
a3ad94ed | 1501 | |
2e702c99 RM |
1502 | const bool dyn = parameters->options().output_is_position_independent(); |
1503 | this->plt_ = this->make_data_plt(layout, | |
1504 | this->got_plt_, | |
1505 | this->got_irelative_, | |
1506 | dyn); | |
1507 | ||
1508 | // Add unwind information if requested. | |
1509 | if (parameters->options().ld_generated_unwind_info()) | |
1510 | this->plt_->add_eh_frame(layout); | |
1511 | ||
16649710 ILT |
1512 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1513 | (elfcpp::SHF_ALLOC | |
1514 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1515 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1516 | |
1517 | // Make the sh_info field of .rel.plt point to .plt. | |
1518 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1519 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1520 | } |
7223e9ca | 1521 | } |
a3ad94ed | 1522 | |
7223e9ca ILT |
1523 | // Create a PLT entry for a global symbol. |
1524 | ||
1525 | void | |
1526 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1527 | { | |
1528 | if (gsym->has_plt_offset()) | |
1529 | return; | |
1530 | if (this->plt_ == NULL) | |
1531 | this->make_plt_section(symtab, layout); | |
67181c72 | 1532 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1533 | } |
1534 | ||
7223e9ca ILT |
1535 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1536 | ||
1537 | void | |
1538 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1539 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1540 | unsigned int local_sym_index) |
1541 | { | |
1542 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1543 | return; | |
1544 | if (this->plt_ == NULL) | |
1545 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1546 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1547 | relobj, | |
7223e9ca ILT |
1548 | local_sym_index); |
1549 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1550 | } | |
1551 | ||
0e70b911 CC |
1552 | // Return the number of entries in the PLT. |
1553 | ||
1554 | unsigned int | |
1555 | Target_i386::plt_entry_count() const | |
1556 | { | |
1557 | if (this->plt_ == NULL) | |
1558 | return 0; | |
1559 | return this->plt_->entry_count(); | |
1560 | } | |
1561 | ||
1562 | // Return the offset of the first non-reserved PLT entry. | |
1563 | ||
1564 | unsigned int | |
1565 | Target_i386::first_plt_entry_offset() const | |
1566 | { | |
2e702c99 | 1567 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1568 | } |
1569 | ||
1570 | // Return the size of each PLT entry. | |
1571 | ||
1572 | unsigned int | |
1573 | Target_i386::plt_entry_size() const | |
1574 | { | |
2e702c99 | 1575 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1576 | } |
1577 | ||
e291e7b9 ILT |
1578 | // Get the section to use for TLS_DESC relocations. |
1579 | ||
1580 | Target_i386::Reloc_section* | |
1581 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1582 | { | |
1583 | return this->plt_section()->rel_tls_desc(layout); | |
1584 | } | |
1585 | ||
9fa33bee | 1586 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1587 | |
1588 | void | |
1589 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1590 | { | |
1591 | if (this->tls_base_symbol_defined_) | |
1592 | return; | |
1593 | ||
1594 | Output_segment* tls_segment = layout->tls_segment(); | |
1595 | if (tls_segment != NULL) | |
1596 | { | |
183fd0e3 | 1597 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1598 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1599 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1600 | tls_segment, 0, 0, |
1601 | elfcpp::STT_TLS, | |
1602 | elfcpp::STB_LOCAL, | |
1603 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1604 | (is_exec |
1605 | ? Symbol::SEGMENT_END | |
1606 | : Symbol::SEGMENT_START), | |
1607 | true); | |
edfbb029 CC |
1608 | } |
1609 | this->tls_base_symbol_defined_ = true; | |
1610 | } | |
1611 | ||
94c4710f ILT |
1612 | // Create a GOT entry for the TLS module index. |
1613 | ||
1614 | unsigned int | |
1615 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2e702c99 | 1616 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1617 | { |
1618 | if (this->got_mod_index_offset_ == -1U) | |
1619 | { | |
1620 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1621 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1622 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1623 | unsigned int got_offset = got->add_constant(0); | |
1624 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
2e702c99 | 1625 | got_offset); |
009a67a2 | 1626 | got->add_constant(0); |
94c4710f ILT |
1627 | this->got_mod_index_offset_ = got_offset; |
1628 | } | |
1629 | return this->got_mod_index_offset_; | |
1630 | } | |
1631 | ||
92e059d8 | 1632 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1633 | // symbol. IS_FINAL is true if the final address of this symbol is |
1634 | // known at link time. | |
92e059d8 | 1635 | |
af6359d5 | 1636 | tls::Tls_optimization |
7e1edb90 | 1637 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1638 | { |
1639 | // If we are generating a shared library, then we can't do anything | |
1640 | // in the linker. | |
8851ecca | 1641 | if (parameters->options().shared()) |
af6359d5 | 1642 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1643 | |
1644 | switch (r_type) | |
1645 | { | |
1646 | case elfcpp::R_386_TLS_GD: | |
1647 | case elfcpp::R_386_TLS_GOTDESC: | |
1648 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1649 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1650 | // access. Since we know that we are generating an executable, |
1651 | // we can convert this to Initial-Exec. If we also know that | |
1652 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1653 | if (is_final) |
af6359d5 ILT |
1654 | return tls::TLSOPT_TO_LE; |
1655 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1656 | |
1657 | case elfcpp::R_386_TLS_LDM: | |
1658 | // This is Local-Dynamic, which refers to a local symbol in the | |
1659 | // dynamic TLS block. Since we know that we generating an | |
1660 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1661 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1662 | |
1663 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1664 | // Another type of Local-Dynamic relocation. |
1665 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1666 | |
1667 | case elfcpp::R_386_TLS_IE: | |
1668 | case elfcpp::R_386_TLS_GOTIE: | |
1669 | case elfcpp::R_386_TLS_IE_32: | |
1670 | // These are Initial-Exec relocs which get the thread offset | |
1671 | // from the GOT. If we know that we are linking against the | |
1672 | // local symbol, we can switch to Local-Exec, which links the | |
1673 | // thread offset into the instruction. | |
a3ad94ed | 1674 | if (is_final) |
af6359d5 ILT |
1675 | return tls::TLSOPT_TO_LE; |
1676 | return tls::TLSOPT_NONE; | |
8462ae85 | 1677 | |
92e059d8 ILT |
1678 | case elfcpp::R_386_TLS_LE: |
1679 | case elfcpp::R_386_TLS_LE_32: | |
1680 | // When we already have Local-Exec, there is nothing further we | |
1681 | // can do. | |
af6359d5 | 1682 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1683 | |
1684 | default: | |
a3ad94ed | 1685 | gold_unreachable(); |
92e059d8 ILT |
1686 | } |
1687 | } | |
1688 | ||
95a2c8d6 | 1689 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1690 | |
95a2c8d6 RS |
1691 | int |
1692 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1693 | { |
1694 | switch (r_type) | |
1695 | { | |
1696 | case elfcpp::R_386_NONE: | |
1697 | case elfcpp::R_386_GNU_VTINHERIT: | |
1698 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1699 | case elfcpp::R_386_GOTPC: |
1700 | // No symbol reference. | |
1701 | return 0; | |
7223e9ca ILT |
1702 | |
1703 | case elfcpp::R_386_32: | |
1704 | case elfcpp::R_386_16: | |
1705 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1706 | return Symbol::ABSOLUTE_REF; |
1707 | ||
7223e9ca ILT |
1708 | case elfcpp::R_386_PC32: |
1709 | case elfcpp::R_386_PC16: | |
1710 | case elfcpp::R_386_PC8: | |
7223e9ca | 1711 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1712 | return Symbol::RELATIVE_REF; |
1713 | ||
1714 | case elfcpp::R_386_PLT32: | |
1715 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1716 | ||
7223e9ca | 1717 | case elfcpp::R_386_GOT32: |
493d4b48 | 1718 | case elfcpp::R_386_GOT32X: |
95a2c8d6 RS |
1719 | // Absolute in GOT. |
1720 | return Symbol::ABSOLUTE_REF; | |
1721 | ||
1722 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1723 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1724 | case elfcpp::R_386_TLS_DESC_CALL: | |
1725 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1726 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1727 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1728 | case elfcpp::R_386_TLS_IE_32: | |
1729 | case elfcpp::R_386_TLS_GOTIE: | |
1730 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1731 | case elfcpp::R_386_TLS_LE_32: | |
1732 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1733 | |
1734 | case elfcpp::R_386_COPY: | |
1735 | case elfcpp::R_386_GLOB_DAT: | |
1736 | case elfcpp::R_386_JUMP_SLOT: | |
1737 | case elfcpp::R_386_RELATIVE: | |
1738 | case elfcpp::R_386_IRELATIVE: | |
1739 | case elfcpp::R_386_TLS_TPOFF: | |
1740 | case elfcpp::R_386_TLS_DTPMOD32: | |
1741 | case elfcpp::R_386_TLS_DTPOFF32: | |
1742 | case elfcpp::R_386_TLS_TPOFF32: | |
1743 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1744 | case elfcpp::R_386_32PLT: |
1745 | case elfcpp::R_386_TLS_GD_32: | |
1746 | case elfcpp::R_386_TLS_GD_PUSH: | |
1747 | case elfcpp::R_386_TLS_GD_CALL: | |
1748 | case elfcpp::R_386_TLS_GD_POP: | |
1749 | case elfcpp::R_386_TLS_LDM_32: | |
1750 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1751 | case elfcpp::R_386_TLS_LDM_CALL: | |
1752 | case elfcpp::R_386_TLS_LDM_POP: | |
1753 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1754 | default: | |
95a2c8d6 RS |
1755 | // Not expected. We will give an error later. |
1756 | return 0; | |
7223e9ca ILT |
1757 | } |
1758 | } | |
1759 | ||
95a2c8d6 RS |
1760 | // Report an unsupported relocation against a local symbol. |
1761 | ||
1762 | void | |
6fa2a40b | 1763 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1764 | unsigned int r_type) |
1765 | { | |
1766 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1767 | object->name().c_str(), r_type); | |
1768 | } | |
1769 | ||
1770 | // Return whether we need to make a PLT entry for a relocation of a | |
1771 | // given type against a STT_GNU_IFUNC symbol. | |
1772 | ||
1773 | bool | |
6fa2a40b CC |
1774 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1775 | Sized_relobj_file<32, false>* object, | |
1776 | unsigned int r_type) | |
95a2c8d6 RS |
1777 | { |
1778 | int flags = Scan::get_reference_flags(r_type); | |
1779 | if (flags & Symbol::TLS_REF) | |
1780 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 1781 | object->name().c_str(), r_type); |
95a2c8d6 RS |
1782 | return flags != 0; |
1783 | } | |
1784 | ||
92e059d8 ILT |
1785 | // Scan a relocation for a local symbol. |
1786 | ||
1787 | inline void | |
ad0f2072 | 1788 | Target_i386::Scan::local(Symbol_table* symtab, |
bfdfa4cd AM |
1789 | Layout* layout, |
1790 | Target_i386* target, | |
1791 | Sized_relobj_file<32, false>* object, | |
1792 | unsigned int data_shndx, | |
1793 | Output_section* output_section, | |
1794 | const elfcpp::Rel<32, false>& reloc, | |
1795 | unsigned int r_type, | |
1796 | const elfcpp::Sym<32, false>& lsym, | |
1797 | bool is_discarded) | |
92e059d8 | 1798 | { |
bfdfa4cd AM |
1799 | if (is_discarded) |
1800 | return; | |
1801 | ||
7223e9ca ILT |
1802 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1803 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1804 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1805 | { | |
1806 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1807 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1808 | } | |
1809 | ||
92e059d8 ILT |
1810 | switch (r_type) |
1811 | { | |
1812 | case elfcpp::R_386_NONE: | |
1813 | case elfcpp::R_386_GNU_VTINHERIT: | |
1814 | case elfcpp::R_386_GNU_VTENTRY: | |
1815 | break; | |
1816 | ||
1817 | case elfcpp::R_386_32: | |
436ca963 ILT |
1818 | // If building a shared library (or a position-independent |
1819 | // executable), we need to create a dynamic relocation for | |
1820 | // this location. The relocation applied at link time will | |
1821 | // apply the link-time value, so we flag the location with | |
1822 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1823 | // relocate it easily. | |
8851ecca | 1824 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1825 | { |
1826 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1827 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1828 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1829 | output_section, data_shndx, | |
1830 | reloc.get_r_offset()); | |
2e702c99 | 1831 | } |
d61c6bd4 ILT |
1832 | break; |
1833 | ||
1834 | case elfcpp::R_386_16: | |
1835 | case elfcpp::R_386_8: | |
1836 | // If building a shared library (or a position-independent | |
1837 | // executable), we need to create a dynamic relocation for | |
1838 | // this location. Because the addend needs to remain in the | |
1839 | // data section, we need to be careful not to apply this | |
1840 | // relocation statically. | |
8851ecca | 1841 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1842 | { |
1843 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1844 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
2e702c99 | 1845 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1846 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1847 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1848 | else |
1849 | { | |
1850 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1851 | unsigned int shndx = lsym.get_st_shndx(); |
1852 | bool is_ordinary; | |
1853 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1854 | &is_ordinary); | |
1855 | if (!is_ordinary) | |
1856 | object->error(_("section symbol %u has bad shndx %u"), | |
1857 | r_sym, shndx); | |
1858 | else | |
1859 | rel_dyn->add_local_section(object, shndx, | |
1860 | r_type, output_section, | |
1861 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1862 | } |
1863 | } | |
92e059d8 ILT |
1864 | break; |
1865 | ||
1866 | case elfcpp::R_386_PC32: | |
1867 | case elfcpp::R_386_PC16: | |
1868 | case elfcpp::R_386_PC8: | |
1869 | break; | |
1870 | ||
df2efe71 ILT |
1871 | case elfcpp::R_386_PLT32: |
1872 | // Since we know this is a local symbol, we can handle this as a | |
1873 | // PC32 reloc. | |
1874 | break; | |
1875 | ||
ead1e424 ILT |
1876 | case elfcpp::R_386_GOTOFF: |
1877 | case elfcpp::R_386_GOTPC: | |
1878 | // We need a GOT section. | |
7e1edb90 | 1879 | target->got_section(symtab, layout); |
ead1e424 ILT |
1880 | break; |
1881 | ||
1b64748b | 1882 | case elfcpp::R_386_GOT32: |
493d4b48 | 1883 | case elfcpp::R_386_GOT32X: |
1b64748b | 1884 | { |
c4fc4724 | 1885 | // We need GOT section. |
2e702c99 | 1886 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
1887 | |
1888 | // If the relocation symbol isn't IFUNC, | |
1889 | // and is local, then we will convert | |
1890 | // mov foo@GOT(%reg), %reg | |
1891 | // to | |
1892 | // lea foo@GOTOFF(%reg), %reg | |
1893 | // in Relocate::relocate. | |
1894 | if (reloc.get_r_offset() >= 2 | |
1895 | && lsym.get_st_type() != elfcpp::STT_GNU_IFUNC) | |
1896 | { | |
1897 | section_size_type stype; | |
1898 | const unsigned char* view = object->section_contents(data_shndx, | |
1899 | &stype, true); | |
1900 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
1901 | break; | |
1902 | } | |
1903 | ||
1904 | // Otherwise, the symbol requires a GOT entry. | |
2e702c99 | 1905 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1906 | |
1907 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1908 | // lets function pointers compare correctly with shared | |
1909 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1910 | bool is_new; | |
1911 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1912 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1913 | else | |
1914 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
1915 | if (is_new) |
1916 | { | |
1917 | // If we are generating a shared object, we need to add a | |
1918 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
1919 | if (parameters->options().output_is_position_independent()) | |
1920 | { | |
1921 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1922 | unsigned int got_offset = |
1923 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1924 | rel_dyn->add_local_relative(object, r_sym, | |
1925 | elfcpp::R_386_RELATIVE, | |
1926 | got, got_offset); | |
2e702c99 RM |
1927 | } |
1928 | } | |
1b64748b ILT |
1929 | } |
1930 | break; | |
1931 | ||
af6359d5 ILT |
1932 | // These are relocations which should only be seen by the |
1933 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1934 | case elfcpp::R_386_COPY: |
1935 | case elfcpp::R_386_GLOB_DAT: | |
1936 | case elfcpp::R_386_JUMP_SLOT: | |
1937 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1938 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1939 | case elfcpp::R_386_TLS_TPOFF: |
1940 | case elfcpp::R_386_TLS_DTPMOD32: | |
1941 | case elfcpp::R_386_TLS_DTPOFF32: | |
1942 | case elfcpp::R_386_TLS_TPOFF32: | |
1943 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1944 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1945 | object->name().c_str(), r_type); |
92e059d8 ILT |
1946 | break; |
1947 | ||
af6359d5 | 1948 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1949 | // linking. |
56622147 ILT |
1950 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1951 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1952 | case elfcpp::R_386_TLS_DESC_CALL: | |
1953 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1954 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1955 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1956 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1957 | case elfcpp::R_386_TLS_GOTIE: |
1958 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1959 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1960 | { |
8851ecca | 1961 | bool output_is_shared = parameters->options().shared(); |
af6359d5 | 1962 | const tls::Tls_optimization optimized_type |
2e702c99 | 1963 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); |
7e1edb90 ILT |
1964 | switch (r_type) |
1965 | { | |
56622147 | 1966 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1967 | if (optimized_type == tls::TLSOPT_NONE) |
1968 | { | |
2e702c99 RM |
1969 | // Create a pair of GOT entries for the module index and |
1970 | // dtv-relative offset. | |
1971 | Output_data_got<32, false>* got | |
1972 | = target->got_section(symtab, layout); | |
1973 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1974 | unsigned int shndx = lsym.get_st_shndx(); |
1975 | bool is_ordinary; | |
1976 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1977 | if (!is_ordinary) | |
1978 | object->error(_("local symbol %u has bad shndx %u"), | |
1979 | r_sym, shndx); | |
2e702c99 | 1980 | else |
d491d34e ILT |
1981 | got->add_local_pair_with_rel(object, r_sym, shndx, |
1982 | GOT_TYPE_TLS_PAIR, | |
1983 | target->rel_dyn_section(layout), | |
bd73a62d | 1984 | elfcpp::R_386_TLS_DTPMOD32); |
07f397ab ILT |
1985 | } |
1986 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1987 | unsupported_reloc_local(object, r_type); | |
1988 | break; | |
1989 | ||
56622147 | 1990 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1991 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
1992 | if (optimized_type == tls::TLSOPT_NONE) |
1993 | { | |
1994 | // Create a double GOT entry with an R_386_TLS_DESC | |
1995 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1996 | // lazily, so the GOT entry needs to be in an area in | |
1997 | // .got.plt, not .got. Call got_section to make sure | |
1998 | // the section has been created. | |
a8df5856 | 1999 | target->got_section(symtab, layout); |
2e702c99 RM |
2000 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
2001 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
2002 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2003 | { | |
2004 | unsigned int got_offset = got->add_constant(0); | |
2005 | // The local symbol value is stored in the second | |
2006 | // GOT entry. | |
2007 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
2008 | // That set the GOT offset of the local symbol to | |
2009 | // point to the second entry, but we want it to | |
2010 | // point to the first. | |
2011 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2012 | got_offset); | |
2013 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
2014 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
2015 | } | |
2e702c99 RM |
2016 | } |
2017 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2018 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
2019 | break; |
2020 | ||
c2b45e22 CC |
2021 | case elfcpp::R_386_TLS_DESC_CALL: |
2022 | break; | |
2023 | ||
56622147 | 2024 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2025 | if (optimized_type == tls::TLSOPT_NONE) |
2026 | { | |
2e702c99 RM |
2027 | // Create a GOT entry for the module index. |
2028 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2029 | } |
2030 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2031 | unsupported_reloc_local(object, r_type); |
2032 | break; | |
2033 | ||
56622147 | 2034 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2035 | break; |
2036 | ||
56622147 ILT |
2037 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2038 | case elfcpp::R_386_TLS_IE_32: | |
2039 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2040 | layout->set_has_static_tls(); |
07f397ab ILT |
2041 | if (optimized_type == tls::TLSOPT_NONE) |
2042 | { | |
2e702c99 RM |
2043 | // For the R_386_TLS_IE relocation, we need to create a |
2044 | // dynamic relocation when building a shared library. | |
2045 | if (r_type == elfcpp::R_386_TLS_IE | |
2046 | && parameters->options().shared()) | |
2047 | { | |
2048 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2049 | unsigned int r_sym | |
2050 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2051 | rel_dyn->add_local_relative(object, r_sym, | |
2052 | elfcpp::R_386_RELATIVE, | |
2053 | output_section, data_shndx, | |
2054 | reloc.get_r_offset()); | |
2055 | } | |
2056 | // Create a GOT entry for the tp-relative offset. | |
2057 | Output_data_got<32, false>* got | |
2058 | = target->got_section(symtab, layout); | |
2059 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2060 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2061 | ? elfcpp::R_386_TLS_TPOFF32 | |
2062 | : elfcpp::R_386_TLS_TPOFF); | |
2063 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2064 | ? GOT_TYPE_TLS_OFFSET | |
2065 | : GOT_TYPE_TLS_NOFFSET); | |
2066 | got->add_local_with_rel(object, r_sym, got_type, | |
2067 | target->rel_dyn_section(layout), | |
2068 | dyn_r_type); | |
07f397ab ILT |
2069 | } |
2070 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2071 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 2072 | break; |
af6359d5 | 2073 | |
56622147 ILT |
2074 | case elfcpp::R_386_TLS_LE: // Local-exec |
2075 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2076 | layout->set_has_static_tls(); |
07f397ab | 2077 | if (output_is_shared) |
7bf1f802 | 2078 | { |
2e702c99 RM |
2079 | // We need to create a dynamic relocation. |
2080 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2081 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2082 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2083 | ? elfcpp::R_386_TLS_TPOFF32 | |
2084 | : elfcpp::R_386_TLS_TPOFF); | |
2085 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2086 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
2087 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2088 | } |
56622147 ILT |
2089 | break; |
2090 | ||
af6359d5 ILT |
2091 | default: |
2092 | gold_unreachable(); | |
7e1edb90 ILT |
2093 | } |
2094 | } | |
92e059d8 ILT |
2095 | break; |
2096 | ||
92e059d8 ILT |
2097 | case elfcpp::R_386_32PLT: |
2098 | case elfcpp::R_386_TLS_GD_32: | |
2099 | case elfcpp::R_386_TLS_GD_PUSH: | |
2100 | case elfcpp::R_386_TLS_GD_CALL: | |
2101 | case elfcpp::R_386_TLS_GD_POP: | |
2102 | case elfcpp::R_386_TLS_LDM_32: | |
2103 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2104 | case elfcpp::R_386_TLS_LDM_CALL: | |
2105 | case elfcpp::R_386_TLS_LDM_POP: | |
2106 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2107 | default: | |
af6359d5 | 2108 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
2109 | break; |
2110 | } | |
2111 | } | |
2112 | ||
af6359d5 ILT |
2113 | // Report an unsupported relocation against a global symbol. |
2114 | ||
2115 | void | |
6fa2a40b CC |
2116 | Target_i386::Scan::unsupported_reloc_global( |
2117 | Sized_relobj_file<32, false>* object, | |
2118 | unsigned int r_type, | |
2119 | Symbol* gsym) | |
af6359d5 | 2120 | { |
75f2446e | 2121 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2122 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
2123 | } |
2124 | ||
0897ed3b ST |
2125 | inline bool |
2126 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
2127 | { | |
2128 | switch (r_type) | |
2129 | { | |
2130 | case elfcpp::R_386_32: | |
2131 | case elfcpp::R_386_16: | |
2132 | case elfcpp::R_386_8: | |
2133 | case elfcpp::R_386_GOTOFF: | |
2134 | case elfcpp::R_386_GOT32: | |
493d4b48 | 2135 | case elfcpp::R_386_GOT32X: |
0897ed3b | 2136 | { |
2e702c99 | 2137 | return true; |
0897ed3b ST |
2138 | } |
2139 | default: | |
2140 | return false; | |
2141 | } | |
2142 | return false; | |
2143 | } | |
2144 | ||
2145 | inline bool | |
2146 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
2147 | Symbol_table* , | |
2148 | Layout* , | |
2149 | Target_i386* , | |
6fa2a40b | 2150 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2151 | unsigned int , |
2152 | Output_section* , | |
2153 | const elfcpp::Rel<32, false>& , | |
2154 | unsigned int r_type, | |
2155 | const elfcpp::Sym<32, false>&) | |
2156 | { | |
2157 | return possible_function_pointer_reloc(r_type); | |
2158 | } | |
2159 | ||
2160 | inline bool | |
2161 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
2162 | Symbol_table* , | |
2163 | Layout* , | |
2164 | Target_i386* , | |
6fa2a40b | 2165 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2166 | unsigned int , |
2167 | Output_section* , | |
2168 | const elfcpp::Rel<32, false>& , | |
2169 | unsigned int r_type, | |
2170 | Symbol*) | |
2171 | { | |
2172 | return possible_function_pointer_reloc(r_type); | |
2173 | } | |
2174 | ||
92e059d8 ILT |
2175 | // Scan a relocation for a global symbol. |
2176 | ||
2177 | inline void | |
ad0f2072 | 2178 | Target_i386::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2179 | Layout* layout, |
2180 | Target_i386* target, | |
2181 | Sized_relobj_file<32, false>* object, | |
2182 | unsigned int data_shndx, | |
2183 | Output_section* output_section, | |
2184 | const elfcpp::Rel<32, false>& reloc, | |
2185 | unsigned int r_type, | |
2186 | Symbol* gsym) | |
92e059d8 | 2187 | { |
7223e9ca ILT |
2188 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2189 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2190 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2191 | target->make_plt_entry(symtab, layout, gsym); | |
2192 | ||
92e059d8 ILT |
2193 | switch (r_type) |
2194 | { | |
2195 | case elfcpp::R_386_NONE: | |
2196 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 2197 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
2198 | break; |
2199 | ||
2200 | case elfcpp::R_386_32: | |
92e059d8 | 2201 | case elfcpp::R_386_16: |
92e059d8 | 2202 | case elfcpp::R_386_8: |
96f2030e | 2203 | { |
2e702c99 RM |
2204 | // Make a PLT entry if necessary. |
2205 | if (gsym->needs_plt_entry()) | |
2206 | { | |
2207 | target->make_plt_entry(symtab, layout, gsym); | |
2208 | // Since this is not a PC-relative relocation, we may be | |
2209 | // taking the address of a function. In that case we need to | |
2210 | // set the entry in the dynamic symbol table to the address of | |
2211 | // the PLT entry. | |
2212 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2213 | gsym->set_needs_dynsym_value(); | |
2214 | } | |
2215 | // Make a dynamic relocation if necessary. | |
2216 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2217 | { | |
a82bef93 ST |
2218 | if (!parameters->options().output_is_position_independent() |
2219 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2220 | { |
2221 | target->copy_reloc(symtab, layout, object, | |
2222 | data_shndx, output_section, gsym, reloc); | |
2223 | } | |
7223e9ca ILT |
2224 | else if (r_type == elfcpp::R_386_32 |
2225 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2226 | && gsym->can_use_relative_reloc(false) | |
2227 | && !gsym->is_from_dynobj() | |
2228 | && !gsym->is_undefined() | |
2229 | && !gsym->is_preemptible()) | |
2230 | { | |
2231 | // Use an IRELATIVE reloc for a locally defined | |
2232 | // STT_GNU_IFUNC symbol. This makes a function | |
2233 | // address in a PIE executable match the address in a | |
2234 | // shared library that it links against. | |
67181c72 | 2235 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
2236 | rel_dyn->add_symbolless_global_addend(gsym, |
2237 | elfcpp::R_386_IRELATIVE, | |
2238 | output_section, | |
2239 | object, data_shndx, | |
2240 | reloc.get_r_offset()); | |
2241 | } | |
2e702c99 RM |
2242 | else if (r_type == elfcpp::R_386_32 |
2243 | && gsym->can_use_relative_reloc(false)) | |
2244 | { | |
2245 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
2246 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2247 | output_section, object, | |
2248 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
2249 | } |
2250 | else | |
2251 | { | |
2252 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2253 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2254 | data_shndx, reloc.get_r_offset()); | |
2255 | } | |
2256 | } | |
d61c6bd4 ILT |
2257 | } |
2258 | break; | |
2259 | ||
2260 | case elfcpp::R_386_PC32: | |
2261 | case elfcpp::R_386_PC16: | |
2262 | case elfcpp::R_386_PC8: | |
2263 | { | |
2e702c99 RM |
2264 | // Make a PLT entry if necessary. |
2265 | if (gsym->needs_plt_entry()) | |
2266 | { | |
2267 | // These relocations are used for function calls only in | |
2268 | // non-PIC code. For a 32-bit relocation in a shared library, | |
2269 | // we'll need a text relocation anyway, so we can skip the | |
2270 | // PLT entry and let the dynamic linker bind the call directly | |
2271 | // to the target. For smaller relocations, we should use a | |
2272 | // PLT entry to ensure that the call can reach. | |
2273 | if (!parameters->options().shared() | |
2274 | || r_type != elfcpp::R_386_PC32) | |
2275 | target->make_plt_entry(symtab, layout, gsym); | |
2276 | } | |
2277 | // Make a dynamic relocation if necessary. | |
2278 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2279 | { | |
a82bef93 ST |
2280 | if (parameters->options().output_is_executable() |
2281 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2282 | { |
2283 | target->copy_reloc(symtab, layout, object, | |
2284 | data_shndx, output_section, gsym, reloc); | |
2285 | } | |
2286 | else | |
2287 | { | |
2288 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2289 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2290 | data_shndx, reloc.get_r_offset()); | |
2291 | } | |
2292 | } | |
96f2030e | 2293 | } |
92e059d8 ILT |
2294 | break; |
2295 | ||
ead1e424 | 2296 | case elfcpp::R_386_GOT32: |
493d4b48 | 2297 | case elfcpp::R_386_GOT32X: |
8462ae85 | 2298 | { |
c4fc4724 | 2299 | // The symbol requires a GOT section. |
2e702c99 | 2300 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
c4fc4724 IT |
2301 | |
2302 | // If we convert this from | |
2303 | // mov foo@GOT(%reg), %reg | |
2304 | // to | |
2305 | // lea foo@GOTOFF(%reg), %reg | |
2306 | // in Relocate::relocate, then there is nothing to do here. | |
2307 | if (reloc.get_r_offset() >= 2 | |
2308 | && Target_i386::can_convert_mov_to_lea(gsym)) | |
2309 | { | |
2310 | section_size_type stype; | |
2311 | const unsigned char* view = object->section_contents(data_shndx, | |
2312 | &stype, true); | |
2313 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
2314 | break; | |
2315 | } | |
2316 | ||
2e702c99 | 2317 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2318 | { |
2319 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2320 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2321 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2322 | else | |
2323 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2324 | } | |
2e702c99 RM |
2325 | else |
2326 | { | |
2327 | // If this symbol is not fully resolved, we need to add a | |
2328 | // GOT entry with a dynamic relocation. | |
2329 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2330 | |
2331 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2332 | // | |
2333 | // 1) The symbol may be defined in some other module. | |
2334 | // | |
2335 | // 2) We are building a shared library and this is a | |
2336 | // protected symbol; using GLOB_DAT means that the dynamic | |
2337 | // linker can use the address of the PLT in the main | |
2338 | // executable when appropriate so that function address | |
2339 | // comparisons work. | |
2340 | // | |
2341 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2342 | // code, again so that function address comparisons work. | |
2e702c99 RM |
2343 | if (gsym->is_from_dynobj() |
2344 | || gsym->is_undefined() | |
2345 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2346 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2347 | && parameters->options().shared()) | |
7223e9ca ILT |
2348 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2349 | && parameters->options().output_is_position_independent())) | |
2e702c99 RM |
2350 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2351 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
2352 | else | |
2353 | { | |
7223e9ca ILT |
2354 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2355 | // offset into the GOT, so that function pointer | |
2356 | // comparisons work correctly. | |
2357 | bool is_new; | |
2358 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2359 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2360 | else | |
2361 | { | |
2362 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2363 | // Tell the dynamic linker to use the PLT address | |
2364 | // when resolving relocations. | |
2365 | if (gsym->is_from_dynobj() | |
2366 | && !parameters->options().shared()) | |
2367 | gsym->set_needs_dynsym_value(); | |
2368 | } | |
2e702c99 | 2369 | if (is_new) |
7223e9ca ILT |
2370 | { |
2371 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2372 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2373 | got, got_off); | |
2374 | } | |
2e702c99 RM |
2375 | } |
2376 | } | |
8462ae85 | 2377 | } |
ead1e424 ILT |
2378 | break; |
2379 | ||
2380 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2381 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2382 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2383 | if (gsym->final_value_is_known()) |
ead1e424 | 2384 | break; |
436ca963 ILT |
2385 | // If building a shared library, we can also skip the PLT entry |
2386 | // if the symbol is defined in the output file and is protected | |
2387 | // or hidden. | |
2388 | if (gsym->is_defined() | |
2e702c99 RM |
2389 | && !gsym->is_from_dynobj() |
2390 | && !gsym->is_preemptible()) | |
436ca963 | 2391 | break; |
7e1edb90 | 2392 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2393 | break; |
2394 | ||
2395 | case elfcpp::R_386_GOTOFF: | |
2396 | case elfcpp::R_386_GOTPC: | |
2397 | // We need a GOT section. | |
7e1edb90 | 2398 | target->got_section(symtab, layout); |
ead1e424 ILT |
2399 | break; |
2400 | ||
af6359d5 ILT |
2401 | // These are relocations which should only be seen by the |
2402 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2403 | case elfcpp::R_386_COPY: |
2404 | case elfcpp::R_386_GLOB_DAT: | |
2405 | case elfcpp::R_386_JUMP_SLOT: | |
2406 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2407 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2408 | case elfcpp::R_386_TLS_TPOFF: |
2409 | case elfcpp::R_386_TLS_DTPMOD32: | |
2410 | case elfcpp::R_386_TLS_DTPOFF32: | |
2411 | case elfcpp::R_386_TLS_TPOFF32: | |
2412 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2413 | gold_error(_("%s: unexpected reloc %u in object file"), |
2414 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2415 | break; |
2416 | ||
d61c17ea ILT |
2417 | // These are initial tls relocs, which are expected when |
2418 | // linking. | |
56622147 ILT |
2419 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2420 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2421 | case elfcpp::R_386_TLS_DESC_CALL: | |
2422 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2423 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2424 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2425 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2426 | case elfcpp::R_386_TLS_GOTIE: |
2427 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2428 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2429 | { |
7e1edb90 | 2430 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 | 2431 | const tls::Tls_optimization optimized_type |
2e702c99 | 2432 | = Target_i386::optimize_tls_reloc(is_final, r_type); |
a3ad94ed ILT |
2433 | switch (r_type) |
2434 | { | |
56622147 | 2435 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2436 | if (optimized_type == tls::TLSOPT_NONE) |
2437 | { | |
2e702c99 RM |
2438 | // Create a pair of GOT entries for the module index and |
2439 | // dtv-relative offset. | |
2440 | Output_data_got<32, false>* got | |
2441 | = target->got_section(symtab, layout); | |
2442 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
2443 | target->rel_dyn_section(layout), | |
2444 | elfcpp::R_386_TLS_DTPMOD32, | |
2445 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2446 | } |
2447 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2448 | { | |
2e702c99 RM |
2449 | // Create a GOT entry for the tp-relative offset. |
2450 | Output_data_got<32, false>* got | |
2451 | = target->got_section(symtab, layout); | |
2452 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2453 | target->rel_dyn_section(layout), | |
2454 | elfcpp::R_386_TLS_TPOFF); | |
07f397ab ILT |
2455 | } |
2456 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2457 | unsupported_reloc_global(object, r_type, gsym); | |
2458 | break; | |
2459 | ||
56622147 | 2460 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2461 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
2462 | if (optimized_type == tls::TLSOPT_NONE) |
2463 | { | |
2464 | // Create a double GOT entry with an R_386_TLS_DESC | |
2465 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2466 | // lazily, so the GOT entry needs to be in an area in | |
2467 | // .got.plt, not .got. Call got_section to make sure | |
2468 | // the section has been created. | |
a8df5856 | 2469 | target->got_section(symtab, layout); |
2e702c99 | 2470 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
e291e7b9 | 2471 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2e702c99 RM |
2472 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2473 | elfcpp::R_386_TLS_DESC, 0); | |
2474 | } | |
2475 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2476 | { | |
2477 | // Create a GOT entry for the tp-relative offset. | |
2478 | Output_data_got<32, false>* got | |
2479 | = target->got_section(symtab, layout); | |
2480 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2481 | target->rel_dyn_section(layout), | |
2482 | elfcpp::R_386_TLS_TPOFF); | |
2483 | } | |
2484 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2485 | unsupported_reloc_global(object, r_type, gsym); | |
c2b45e22 CC |
2486 | break; |
2487 | ||
2488 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2489 | break; |
2490 | ||
56622147 | 2491 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2492 | if (optimized_type == tls::TLSOPT_NONE) |
2493 | { | |
2e702c99 RM |
2494 | // Create a GOT entry for the module index. |
2495 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2496 | } |
2497 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2498 | unsupported_reloc_global(object, r_type, gsym); |
2499 | break; | |
2500 | ||
56622147 | 2501 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2502 | break; |
2503 | ||
56622147 ILT |
2504 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2505 | case elfcpp::R_386_TLS_IE_32: | |
2506 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2507 | layout->set_has_static_tls(); |
07f397ab ILT |
2508 | if (optimized_type == tls::TLSOPT_NONE) |
2509 | { | |
2e702c99 RM |
2510 | // For the R_386_TLS_IE relocation, we need to create a |
2511 | // dynamic relocation when building a shared library. | |
2512 | if (r_type == elfcpp::R_386_TLS_IE | |
2513 | && parameters->options().shared()) | |
2514 | { | |
2515 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2516 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2517 | output_section, object, | |
2518 | data_shndx, | |
2519 | reloc.get_r_offset()); | |
2520 | } | |
2521 | // Create a GOT entry for the tp-relative offset. | |
2522 | Output_data_got<32, false>* got | |
2523 | = target->got_section(symtab, layout); | |
2524 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2525 | ? elfcpp::R_386_TLS_TPOFF32 | |
2526 | : elfcpp::R_386_TLS_TPOFF); | |
2527 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2528 | ? GOT_TYPE_TLS_OFFSET | |
2529 | : GOT_TYPE_TLS_NOFFSET); | |
2530 | got->add_global_with_rel(gsym, got_type, | |
2531 | target->rel_dyn_section(layout), | |
2532 | dyn_r_type); | |
07f397ab ILT |
2533 | } |
2534 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2535 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2536 | break; |
af6359d5 | 2537 | |
56622147 ILT |
2538 | case elfcpp::R_386_TLS_LE: // Local-exec |
2539 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2540 | layout->set_has_static_tls(); |
8851ecca | 2541 | if (parameters->options().shared()) |
7bf1f802 | 2542 | { |
2e702c99 RM |
2543 | // We need to create a dynamic relocation. |
2544 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2545 | ? elfcpp::R_386_TLS_TPOFF32 | |
2546 | : elfcpp::R_386_TLS_TPOFF); | |
2547 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2548 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2549 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2550 | } |
56622147 ILT |
2551 | break; |
2552 | ||
af6359d5 ILT |
2553 | default: |
2554 | gold_unreachable(); | |
a3ad94ed ILT |
2555 | } |
2556 | } | |
92e059d8 ILT |
2557 | break; |
2558 | ||
92e059d8 ILT |
2559 | case elfcpp::R_386_32PLT: |
2560 | case elfcpp::R_386_TLS_GD_32: | |
2561 | case elfcpp::R_386_TLS_GD_PUSH: | |
2562 | case elfcpp::R_386_TLS_GD_CALL: | |
2563 | case elfcpp::R_386_TLS_GD_POP: | |
2564 | case elfcpp::R_386_TLS_LDM_32: | |
2565 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2566 | case elfcpp::R_386_TLS_LDM_CALL: | |
2567 | case elfcpp::R_386_TLS_LDM_POP: | |
2568 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2569 | default: | |
af6359d5 | 2570 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2571 | break; |
2572 | } | |
2573 | } | |
2574 | ||
6d03d481 ST |
2575 | // Process relocations for gc. |
2576 | ||
2577 | void | |
ad0f2072 | 2578 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
2579 | Layout* layout, |
2580 | Sized_relobj_file<32, false>* object, | |
2581 | unsigned int data_shndx, | |
2582 | unsigned int, | |
2583 | const unsigned char* prelocs, | |
2584 | size_t reloc_count, | |
2585 | Output_section* output_section, | |
2586 | bool needs_special_offset_handling, | |
2587 | size_t local_symbol_count, | |
2588 | const unsigned char* plocal_symbols) | |
6d03d481 | 2589 | { |
4d625b70 | 2590 | gold::gc_process_relocs<32, false, Target_i386, Scan, Classify_reloc>( |
6d03d481 ST |
2591 | symtab, |
2592 | layout, | |
2593 | this, | |
2594 | object, | |
2595 | data_shndx, | |
2596 | prelocs, | |
2597 | reloc_count, | |
2598 | output_section, | |
2599 | needs_special_offset_handling, | |
2600 | local_symbol_count, | |
2601 | plocal_symbols); | |
2602 | } | |
2603 | ||
92e059d8 ILT |
2604 | // Scan relocations for a section. |
2605 | ||
2606 | void | |
ad0f2072 | 2607 | Target_i386::scan_relocs(Symbol_table* symtab, |
2e702c99 RM |
2608 | Layout* layout, |
2609 | Sized_relobj_file<32, false>* object, | |
2610 | unsigned int data_shndx, | |
2611 | unsigned int sh_type, | |
2612 | const unsigned char* prelocs, | |
2613 | size_t reloc_count, | |
2614 | Output_section* output_section, | |
2615 | bool needs_special_offset_handling, | |
2616 | size_t local_symbol_count, | |
2617 | const unsigned char* plocal_symbols) | |
92e059d8 ILT |
2618 | { |
2619 | if (sh_type == elfcpp::SHT_RELA) | |
2620 | { | |
75f2446e ILT |
2621 | gold_error(_("%s: unsupported RELA reloc section"), |
2622 | object->name().c_str()); | |
2623 | return; | |
92e059d8 ILT |
2624 | } |
2625 | ||
4d625b70 | 2626 | gold::scan_relocs<32, false, Target_i386, Scan, Classify_reloc>( |
92e059d8 | 2627 | symtab, |
ead1e424 ILT |
2628 | layout, |
2629 | this, | |
92e059d8 | 2630 | object, |
a3ad94ed | 2631 | data_shndx, |
92e059d8 ILT |
2632 | prelocs, |
2633 | reloc_count, | |
730cdc88 ILT |
2634 | output_section, |
2635 | needs_special_offset_handling, | |
92e059d8 | 2636 | local_symbol_count, |
730cdc88 | 2637 | plocal_symbols); |
92e059d8 ILT |
2638 | } |
2639 | ||
16649710 | 2640 | // Finalize the sections. |
5a6f7e2d ILT |
2641 | |
2642 | void | |
f59f41f3 DK |
2643 | Target_i386::do_finalize_sections( |
2644 | Layout* layout, | |
2645 | const Input_objects*, | |
e785ec03 | 2646 | Symbol_table* symtab) |
5a6f7e2d | 2647 | { |
ea715a34 ILT |
2648 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2649 | ? NULL | |
2650 | : this->plt_->rel_plt()); | |
2651 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2652 | this->rel_dyn_, true, false); |
16649710 ILT |
2653 | |
2654 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2655 | // relocs. | |
12c0daef ILT |
2656 | if (this->copy_relocs_.any_saved_relocs()) |
2657 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2658 | |
2659 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2660 | // the .got.plt section. | |
2661 | Symbol* sym = this->global_offset_table_; | |
2662 | if (sym != NULL) | |
2663 | { | |
2664 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2665 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2666 | } | |
28a13fec | 2667 | |
67181c72 ILT |
2668 | if (parameters->doing_static_link() |
2669 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2670 | { |
2671 | // If linking statically, make sure that the __rel_iplt symbols | |
2672 | // were defined if necessary, even if we didn't create a PLT. | |
2673 | static const Define_symbol_in_segment syms[] = | |
2674 | { | |
2675 | { | |
2676 | "__rel_iplt_start", // name | |
2677 | elfcpp::PT_LOAD, // segment_type | |
2678 | elfcpp::PF_W, // segment_flags_set | |
2679 | elfcpp::PF(0), // segment_flags_clear | |
2680 | 0, // value | |
2681 | 0, // size | |
2682 | elfcpp::STT_NOTYPE, // type | |
2683 | elfcpp::STB_GLOBAL, // binding | |
2684 | elfcpp::STV_HIDDEN, // visibility | |
2685 | 0, // nonvis | |
2686 | Symbol::SEGMENT_START, // offset_from_base | |
2687 | true // only_if_ref | |
2688 | }, | |
2689 | { | |
2690 | "__rel_iplt_end", // name | |
2691 | elfcpp::PT_LOAD, // segment_type | |
2692 | elfcpp::PF_W, // segment_flags_set | |
2693 | elfcpp::PF(0), // segment_flags_clear | |
2694 | 0, // value | |
2695 | 0, // size | |
2696 | elfcpp::STT_NOTYPE, // type | |
2697 | elfcpp::STB_GLOBAL, // binding | |
2698 | elfcpp::STV_HIDDEN, // visibility | |
2699 | 0, // nonvis | |
2700 | Symbol::SEGMENT_START, // offset_from_base | |
2701 | true // only_if_ref | |
2702 | } | |
2703 | }; | |
2704 | ||
2705 | symtab->define_symbols(layout, 2, syms, | |
2706 | layout->script_options()->saw_sections_clause()); | |
2707 | } | |
5a6f7e2d ILT |
2708 | } |
2709 | ||
86849f1f ILT |
2710 | // Return whether a direct absolute static relocation needs to be applied. |
2711 | // In cases where Scan::local() or Scan::global() has created | |
2712 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2713 | // of the relocation is carried in the data, and we must not | |
2714 | // apply the static relocation. | |
2715 | ||
2716 | inline bool | |
2717 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
2718 | unsigned int r_type, |
2719 | bool is_32bit, | |
031cdbed | 2720 | Output_section* output_section) |
86849f1f | 2721 | { |
031cdbed ILT |
2722 | // If the output section is not allocated, then we didn't call |
2723 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2724 | // the reloc here. | |
2725 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2726 | return true; | |
2727 | ||
95a2c8d6 RS |
2728 | int ref_flags = Scan::get_reference_flags(r_type); |
2729 | ||
d61c6bd4 ILT |
2730 | // For local symbols, we will have created a non-RELATIVE dynamic |
2731 | // relocation only if (a) the output is position independent, | |
2732 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2733 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2734 | if (gsym == NULL) |
8851ecca | 2735 | return !(parameters->options().output_is_position_independent() |
2e702c99 RM |
2736 | && (ref_flags & Symbol::ABSOLUTE_REF) |
2737 | && !is_32bit); | |
86849f1f | 2738 | |
0700cf32 ILT |
2739 | // For global symbols, we use the same helper routines used in the |
2740 | // scan pass. If we did not create a dynamic relocation, or if we | |
2741 | // created a RELATIVE dynamic relocation, we should apply the static | |
2742 | // relocation. | |
2743 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2744 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2e702c99 RM |
2745 | && gsym->can_use_relative_reloc(ref_flags |
2746 | & Symbol::FUNCTION_CALL); | |
0700cf32 | 2747 | return !has_dyn || is_rel; |
86849f1f ILT |
2748 | } |
2749 | ||
61ba1cf9 ILT |
2750 | // Perform a relocation. |
2751 | ||
ead1e424 | 2752 | inline bool |
92e059d8 | 2753 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
91a65d2f AM |
2754 | unsigned int, |
2755 | Target_i386* target, | |
2756 | Output_section* output_section, | |
2757 | size_t relnum, | |
2758 | const unsigned char* preloc, | |
2759 | const Sized_symbol<32>* gsym, | |
2760 | const Symbol_value<32>* psymval, | |
2761 | unsigned char* view, | |
2762 | elfcpp::Elf_types<32>::Elf_Addr address, | |
2763 | section_size_type view_size) | |
61ba1cf9 | 2764 | { |
91a65d2f AM |
2765 | const elfcpp::Rel<32, false> rel(preloc); |
2766 | unsigned int r_type = elfcpp::elf_r_type<32>(rel.get_r_info()); | |
2767 | ||
ead1e424 ILT |
2768 | if (this->skip_call_tls_get_addr_) |
2769 | { | |
5efc7cd2 | 2770 | if ((r_type != elfcpp::R_386_PLT32 |
2e702c99 | 2771 | && r_type != elfcpp::R_386_PC32) |
ead1e424 ILT |
2772 | || gsym == NULL |
2773 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2774 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2775 | _("missing expected TLS relocation")); | |
2776 | else | |
ead1e424 | 2777 | { |
75f2446e ILT |
2778 | this->skip_call_tls_get_addr_ = false; |
2779 | return false; | |
ead1e424 | 2780 | } |
ead1e424 ILT |
2781 | } |
2782 | ||
0e804863 ILT |
2783 | if (view == NULL) |
2784 | return true; | |
2785 | ||
6fa2a40b | 2786 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2787 | |
a3ad94ed | 2788 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2789 | Symbol_value<32> symval; |
436ca963 | 2790 | if (gsym != NULL |
7223e9ca ILT |
2791 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2792 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2793 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2794 | && gsym->can_use_relative_reloc(false) |
2795 | && !gsym->is_from_dynobj() | |
2796 | && !gsym->is_undefined() | |
2797 | && !gsym->is_preemptible()) | |
2798 | { | |
2799 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2800 | // want to use the real value of the symbol, not the PLT offset. | |
2801 | } | |
2802 | else if (gsym != NULL | |
95a2c8d6 | 2803 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2804 | { |
19fec8c1 | 2805 | symval.set_output_value(target->plt_address_for_global(gsym)); |
b8e6aad9 | 2806 | psymval = &symval; |
a3ad94ed | 2807 | } |
7223e9ca ILT |
2808 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2809 | { | |
2810 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2811 | if (object->local_has_plt_offset(r_sym)) | |
2812 | { | |
19fec8c1 | 2813 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
2814 | psymval = &symval; |
2815 | } | |
2816 | } | |
b8e6aad9 | 2817 | |
3043c1ab L |
2818 | bool baseless; |
2819 | ||
61ba1cf9 ILT |
2820 | switch (r_type) |
2821 | { | |
2822 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2823 | case elfcpp::R_386_GNU_VTINHERIT: |
2824 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2825 | break; |
2826 | ||
2827 | case elfcpp::R_386_32: | |
95a2c8d6 | 2828 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2829 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2830 | break; |
2831 | ||
2832 | case elfcpp::R_386_PC32: | |
95a2c8d6 | 2833 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2834 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
92e059d8 ILT |
2835 | break; |
2836 | ||
2837 | case elfcpp::R_386_16: | |
95a2c8d6 | 2838 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2839 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2840 | break; |
2841 | ||
2842 | case elfcpp::R_386_PC16: | |
95a2c8d6 | 2843 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2844 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
61ba1cf9 ILT |
2845 | break; |
2846 | ||
92e059d8 | 2847 | case elfcpp::R_386_8: |
95a2c8d6 | 2848 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2849 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2850 | break; |
2851 | ||
2852 | case elfcpp::R_386_PC8: | |
95a2c8d6 | 2853 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2854 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
92e059d8 ILT |
2855 | break; |
2856 | ||
ead1e424 | 2857 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2858 | gold_assert(gsym == NULL |
2859 | || gsym->has_plt_offset() | |
99f8faca ILT |
2860 | || gsym->final_value_is_known() |
2861 | || (gsym->is_defined() | |
2862 | && !gsym->is_from_dynobj() | |
2863 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2864 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2865 | break; |
2866 | ||
2867 | case elfcpp::R_386_GOT32: | |
493d4b48 | 2868 | case elfcpp::R_386_GOT32X: |
3043c1ab L |
2869 | baseless = (view[-1] & 0xc7) == 0x5; |
2870 | // R_386_GOT32 and R_386_GOT32X don't work without base register | |
2871 | // when generating a position-independent output file. | |
2872 | if (baseless | |
2873 | && parameters->options().output_is_position_independent()) | |
2874 | { | |
2875 | if(gsym) | |
2876 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
2877 | _("unexpected reloc %u against global symbol %s without base register in object file when generating a position-independent output file"), | |
2878 | r_type, gsym->demangled_name().c_str()); | |
2879 | else | |
2880 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
2881 | _("unexpected reloc %u against local symbol without base register in object file when generating a position-independent output file"), | |
2882 | r_type); | |
2883 | } | |
2884 | ||
c4fc4724 IT |
2885 | // Convert |
2886 | // mov foo@GOT(%reg), %reg | |
2887 | // to | |
2888 | // lea foo@GOTOFF(%reg), %reg | |
2889 | // if possible. | |
2890 | if (rel.get_r_offset() >= 2 | |
2891 | && view[-2] == 0x8b | |
2892 | && ((gsym == NULL && !psymval->is_ifunc_symbol()) | |
2893 | || (gsym != NULL | |
2894 | && Target_i386::can_convert_mov_to_lea(gsym)))) | |
2895 | { | |
2896 | view[-2] = 0x8d; | |
2897 | elfcpp::Elf_types<32>::Elf_Addr value; | |
3043c1ab L |
2898 | value = psymval->value(object, 0); |
2899 | // Don't subtract the .got.plt section address for baseless | |
2900 | // addressing. | |
2901 | if (!baseless) | |
2902 | value -= target->got_plt_section()->address(); | |
c4fc4724 IT |
2903 | Relocate_functions<32, false>::rel32(view, value); |
2904 | } | |
2905 | else | |
2906 | { | |
2907 | // The GOT pointer points to the end of the GOT section. | |
2908 | // We need to subtract the size of the GOT section to get | |
2909 | // the actual offset to use in the relocation. | |
2910 | unsigned int got_offset = 0; | |
2911 | if (gsym != NULL) | |
2912 | { | |
2913 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
2914 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2915 | - target->got_size()); | |
2916 | } | |
2917 | else | |
2918 | { | |
2919 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2920 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2921 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2922 | - target->got_size()); | |
2923 | } | |
3043c1ab L |
2924 | // Add the .got.plt section address for baseless addressing. |
2925 | if (baseless) | |
2926 | got_offset += target->got_plt_section()->address(); | |
c4fc4724 IT |
2927 | Relocate_functions<32, false>::rel32(view, got_offset); |
2928 | } | |
ead1e424 ILT |
2929 | break; |
2930 | ||
2931 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2932 | { |
2933 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2934 | value = (psymval->value(object, 0) | |
96f2030e | 2935 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2936 | Relocate_functions<32, false>::rel32(view, value); |
2937 | } | |
ead1e424 ILT |
2938 | break; |
2939 | ||
2940 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2941 | { |
2942 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2943 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2944 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2945 | } | |
ead1e424 ILT |
2946 | break; |
2947 | ||
92e059d8 ILT |
2948 | case elfcpp::R_386_COPY: |
2949 | case elfcpp::R_386_GLOB_DAT: | |
2950 | case elfcpp::R_386_JUMP_SLOT: | |
2951 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2952 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2953 | // These are outstanding tls relocs, which are unexpected when |
2954 | // linking. | |
92e059d8 ILT |
2955 | case elfcpp::R_386_TLS_TPOFF: |
2956 | case elfcpp::R_386_TLS_DTPMOD32: | |
2957 | case elfcpp::R_386_TLS_DTPOFF32: | |
2958 | case elfcpp::R_386_TLS_TPOFF32: | |
2959 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2960 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2961 | _("unexpected reloc %u in object file"), | |
2962 | r_type); | |
92e059d8 ILT |
2963 | break; |
2964 | ||
d61c17ea ILT |
2965 | // These are initial tls relocs, which are expected when |
2966 | // linking. | |
56622147 ILT |
2967 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2968 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2969 | case elfcpp::R_386_TLS_DESC_CALL: | |
2970 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2971 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2972 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2973 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2974 | case elfcpp::R_386_TLS_GOTIE: |
2975 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2976 | case elfcpp::R_386_TLS_LE_32: |
07f397ab | 2977 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2e702c99 | 2978 | view, address, view_size); |
92e059d8 ILT |
2979 | break; |
2980 | ||
92e059d8 ILT |
2981 | case elfcpp::R_386_32PLT: |
2982 | case elfcpp::R_386_TLS_GD_32: | |
2983 | case elfcpp::R_386_TLS_GD_PUSH: | |
2984 | case elfcpp::R_386_TLS_GD_CALL: | |
2985 | case elfcpp::R_386_TLS_GD_POP: | |
2986 | case elfcpp::R_386_TLS_LDM_32: | |
2987 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2988 | case elfcpp::R_386_TLS_LDM_CALL: | |
2989 | case elfcpp::R_386_TLS_LDM_POP: | |
2990 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2991 | default: |
75f2446e ILT |
2992 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2993 | _("unsupported reloc %u"), | |
2994 | r_type); | |
92e059d8 ILT |
2995 | break; |
2996 | } | |
ead1e424 ILT |
2997 | |
2998 | return true; | |
92e059d8 ILT |
2999 | } |
3000 | ||
3001 | // Perform a TLS relocation. | |
3002 | ||
3003 | inline void | |
3004 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
2e702c99 | 3005 | Target_i386* target, |
92e059d8 ILT |
3006 | size_t relnum, |
3007 | const elfcpp::Rel<32, false>& rel, | |
3008 | unsigned int r_type, | |
c06b7b0b | 3009 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 3010 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
3011 | unsigned char* view, |
3012 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 3013 | section_size_type view_size) |
92e059d8 ILT |
3014 | { |
3015 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 3016 | |
6fa2a40b | 3017 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
3018 | |
3019 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 3020 | |
b3705d2a ILT |
3021 | const bool is_final = (gsym == NULL |
3022 | ? !parameters->options().shared() | |
3023 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
3024 | const tls::Tls_optimization optimized_type |
3025 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
3026 | switch (r_type) |
3027 | { | |
56622147 | 3028 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 3029 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 3030 | { |
62855347 ILT |
3031 | if (tls_segment == NULL) |
3032 | { | |
191f1a2d ILT |
3033 | gold_assert(parameters->errors()->error_count() > 0 |
3034 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3035 | return; |
3036 | } | |
56622147 ILT |
3037 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
3038 | rel, r_type, value, view, | |
3039 | view_size); | |
92e059d8 ILT |
3040 | break; |
3041 | } | |
07f397ab | 3042 | else |
2e702c99 RM |
3043 | { |
3044 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3045 | ? GOT_TYPE_TLS_NOFFSET | |
3046 | : GOT_TYPE_TLS_PAIR); | |
3047 | unsigned int got_offset; | |
3048 | if (gsym != NULL) | |
3049 | { | |
3050 | gold_assert(gsym->has_got_offset(got_type)); | |
3051 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3052 | } | |
3053 | else | |
3054 | { | |
3055 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3056 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3057 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab | 3058 | - target->got_size()); |
2e702c99 RM |
3059 | } |
3060 | if (optimized_type == tls::TLSOPT_TO_IE) | |
07f397ab | 3061 | { |
d21f123b | 3062 | this->tls_gd_to_ie(relinfo, relnum, rel, r_type, |
2e702c99 RM |
3063 | got_offset, view, view_size); |
3064 | break; | |
3065 | } | |
3066 | else if (optimized_type == tls::TLSOPT_NONE) | |
3067 | { | |
3068 | // Relocate the field with the offset of the pair of GOT | |
3069 | // entries. | |
3070 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3071 | break; | |
07f397ab | 3072 | } |
2e702c99 | 3073 | } |
75f2446e ILT |
3074 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3075 | _("unsupported reloc %u"), | |
3076 | r_type); | |
92e059d8 ILT |
3077 | break; |
3078 | ||
56622147 ILT |
3079 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
3080 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 3081 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 | 3082 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3083 | { |
62855347 ILT |
3084 | if (tls_segment == NULL) |
3085 | { | |
191f1a2d ILT |
3086 | gold_assert(parameters->errors()->error_count() > 0 |
3087 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3088 | return; |
3089 | } | |
c2b45e22 | 3090 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3091 | rel, r_type, value, view, |
3092 | view_size); | |
c2b45e22 | 3093 | break; |
2e702c99 | 3094 | } |
c2b45e22 | 3095 | else |
2e702c99 RM |
3096 | { |
3097 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3098 | ? GOT_TYPE_TLS_NOFFSET | |
3099 | : GOT_TYPE_TLS_DESC); | |
3100 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3101 | if (r_type == elfcpp::R_386_TLS_GOTDESC |
3102 | && optimized_type == tls::TLSOPT_NONE) | |
3103 | { | |
3104 | // We created GOT entries in the .got.tlsdesc portion of | |
3105 | // the .got.plt section, but the offset stored in the | |
3106 | // symbol is the offset within .got.tlsdesc. | |
3107 | got_offset = (target->got_size() | |
3108 | + target->got_plt_section()->data_size()); | |
3109 | } | |
2e702c99 RM |
3110 | if (gsym != NULL) |
3111 | { | |
3112 | gold_assert(gsym->has_got_offset(got_type)); | |
3113 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3114 | } | |
3115 | else | |
3116 | { | |
3117 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3118 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3119 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3120 | - target->got_size()); |
2e702c99 RM |
3121 | } |
3122 | if (optimized_type == tls::TLSOPT_TO_IE) | |
c2b45e22 | 3123 | { |
d21f123b | 3124 | this->tls_desc_gd_to_ie(relinfo, relnum, rel, r_type, |
2e702c99 RM |
3125 | got_offset, view, view_size); |
3126 | break; | |
3127 | } | |
3128 | else if (optimized_type == tls::TLSOPT_NONE) | |
3129 | { | |
3130 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3131 | { | |
3132 | // Relocate the field with the offset of the pair of GOT | |
3133 | // entries. | |
3134 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3135 | } | |
3136 | break; | |
c2b45e22 | 3137 | } |
2e702c99 | 3138 | } |
75f2446e ILT |
3139 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3140 | _("unsupported reloc %u"), | |
3141 | r_type); | |
ead1e424 ILT |
3142 | break; |
3143 | ||
56622147 | 3144 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
3145 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
3146 | { | |
75f2446e ILT |
3147 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3148 | _("both SUN and GNU model " | |
3149 | "TLS relocations")); | |
3150 | break; | |
46cf9fa2 ILT |
3151 | } |
3152 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 3153 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 3154 | { |
62855347 ILT |
3155 | if (tls_segment == NULL) |
3156 | { | |
191f1a2d ILT |
3157 | gold_assert(parameters->errors()->error_count() > 0 |
3158 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3159 | return; |
3160 | } | |
46cf9fa2 ILT |
3161 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
3162 | value, view, view_size); | |
3163 | break; | |
3164 | } | |
07f397ab | 3165 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3166 | { |
3167 | // Relocate the field with the offset of the GOT entry for | |
3168 | // the module index. | |
3169 | unsigned int got_offset; | |
3170 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
94c4710f | 3171 | - target->got_size()); |
2e702c99 RM |
3172 | Relocate_functions<32, false>::rel32(view, got_offset); |
3173 | break; | |
3174 | } | |
75f2446e ILT |
3175 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3176 | _("unsupported reloc %u"), | |
3177 | r_type); | |
46cf9fa2 ILT |
3178 | break; |
3179 | ||
56622147 | 3180 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 3181 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 3182 | { |
82bb573a ILT |
3183 | // This reloc can appear in debugging sections, in which |
3184 | // case we must not convert to local-exec. We decide what | |
3185 | // to do based on whether the section is marked as | |
3186 | // containing executable code. That is what the GNU linker | |
3187 | // does as well. | |
3188 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
3189 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 3190 | { |
62855347 ILT |
3191 | if (tls_segment == NULL) |
3192 | { | |
191f1a2d ILT |
3193 | gold_assert(parameters->errors()->error_count() > 0 |
3194 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3195 | return; |
3196 | } | |
d6f22b98 ILT |
3197 | value -= tls_segment->memsz(); |
3198 | } | |
e8a9fcda | 3199 | } |
46cf9fa2 ILT |
3200 | Relocate_functions<32, false>::rel32(view, value); |
3201 | break; | |
3202 | ||
56622147 ILT |
3203 | case elfcpp::R_386_TLS_IE: // Initial-exec |
3204 | case elfcpp::R_386_TLS_GOTIE: | |
3205 | case elfcpp::R_386_TLS_IE_32: | |
3206 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3207 | { | |
62855347 ILT |
3208 | if (tls_segment == NULL) |
3209 | { | |
191f1a2d ILT |
3210 | gold_assert(parameters->errors()->error_count() > 0 |
3211 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3212 | return; |
3213 | } | |
56622147 ILT |
3214 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
3215 | rel, r_type, value, view, | |
3216 | view_size); | |
3217 | break; | |
3218 | } | |
07f397ab | 3219 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3220 | { |
3221 | // Relocate the field with the offset of the GOT entry for | |
3222 | // the tp-relative offset of the symbol. | |
c2b45e22 | 3223 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2e702c99 RM |
3224 | ? GOT_TYPE_TLS_OFFSET |
3225 | : GOT_TYPE_TLS_NOFFSET); | |
3226 | unsigned int got_offset; | |
3227 | if (gsym != NULL) | |
3228 | { | |
3229 | gold_assert(gsym->has_got_offset(got_type)); | |
3230 | got_offset = gsym->got_offset(got_type); | |
3231 | } | |
3232 | else | |
3233 | { | |
3234 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3235 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3236 | got_offset = object->local_got_offset(r_sym, got_type); | |
3237 | } | |
3238 | // For the R_386_TLS_IE relocation, we need to apply the | |
3239 | // absolute address of the GOT entry. | |
3240 | if (r_type == elfcpp::R_386_TLS_IE) | |
3241 | got_offset += target->got_plt_section()->address(); | |
3242 | // All GOT offsets are relative to the end of the GOT. | |
3243 | got_offset -= target->got_size(); | |
3244 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3245 | break; | |
3246 | } | |
75f2446e ILT |
3247 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3248 | _("unsupported reloc %u"), | |
3249 | r_type); | |
92e059d8 | 3250 | break; |
92e059d8 | 3251 | |
56622147 | 3252 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
3253 | // If we're creating a shared library, a dynamic relocation will |
3254 | // have been created for this location, so do not apply it now. | |
8851ecca | 3255 | if (!parameters->options().shared()) |
2e702c99 | 3256 | { |
62855347 ILT |
3257 | if (tls_segment == NULL) |
3258 | { | |
191f1a2d ILT |
3259 | gold_assert(parameters->errors()->error_count() > 0 |
3260 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3261 | return; |
3262 | } | |
2e702c99 RM |
3263 | value -= tls_segment->memsz(); |
3264 | Relocate_functions<32, false>::rel32(view, value); | |
3265 | } | |
56622147 | 3266 | break; |
92e059d8 | 3267 | |
56622147 | 3268 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
3269 | // If we're creating a shared library, a dynamic relocation will |
3270 | // have been created for this location, so do not apply it now. | |
8851ecca | 3271 | if (!parameters->options().shared()) |
2e702c99 | 3272 | { |
62855347 ILT |
3273 | if (tls_segment == NULL) |
3274 | { | |
191f1a2d ILT |
3275 | gold_assert(parameters->errors()->error_count() > 0 |
3276 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3277 | return; |
3278 | } | |
2e702c99 RM |
3279 | value = tls_segment->memsz() - value; |
3280 | Relocate_functions<32, false>::rel32(view, value); | |
3281 | } | |
56622147 | 3282 | break; |
92e059d8 | 3283 | } |
92e059d8 ILT |
3284 | } |
3285 | ||
e041f13d | 3286 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
3287 | // Local-Exec. |
3288 | ||
3289 | inline void | |
3290 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
3291 | size_t relnum, | |
3292 | Output_segment* tls_segment, | |
3293 | const elfcpp::Rel<32, false>& rel, | |
3294 | unsigned int, | |
3295 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3296 | unsigned char* view, | |
fe8718a4 | 3297 | section_size_type view_size) |
ead1e424 ILT |
3298 | { |
3299 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 3300 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
3301 | // leal foo(%reg),%eax; call ___tls_get_addr |
3302 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
3303 | ||
af6359d5 ILT |
3304 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3305 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
3306 | |
3307 | unsigned char op1 = view[-1]; | |
3308 | unsigned char op2 = view[-2]; | |
3309 | ||
af6359d5 | 3310 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3311 | op2 == 0x8d || op2 == 0x04); |
af6359d5 | 3312 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
ead1e424 ILT |
3313 | |
3314 | int roff = 5; | |
3315 | ||
3316 | if (op2 == 0x04) | |
3317 | { | |
af6359d5 ILT |
3318 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
3319 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3320 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3321 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
ead1e424 ILT |
3322 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
3323 | } | |
3324 | else | |
3325 | { | |
af6359d5 | 3326 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3327 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3328 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3329 | && view[9] == 0x90) |
ead1e424 ILT |
3330 | { |
3331 | // There is a trailing nop. Use the size byte subl. | |
3332 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3333 | roff = 6; | |
3334 | } | |
3335 | else | |
3336 | { | |
3337 | // Use the five byte subl. | |
3338 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3339 | } | |
3340 | } | |
3341 | ||
7bf1f802 | 3342 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3343 | Relocate_functions<32, false>::rel32(view + roff, value); |
3344 | ||
3345 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3346 | // We can skip it. | |
3347 | this->skip_call_tls_get_addr_ = true; | |
3348 | } | |
3349 | ||
7bf1f802 | 3350 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3351 | // Initial-Exec. |
3352 | ||
3353 | inline void | |
3354 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3355 | size_t relnum, | |
07f397ab ILT |
3356 | const elfcpp::Rel<32, false>& rel, |
3357 | unsigned int, | |
3358 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3359 | unsigned char* view, | |
fe8718a4 | 3360 | section_size_type view_size) |
07f397ab ILT |
3361 | { |
3362 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3363 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
152f7024 CC |
3364 | // leal foo(%ebx),%eax; call ___tls_get_addr; nop |
3365 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
07f397ab ILT |
3366 | |
3367 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3368 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3369 | ||
3370 | unsigned char op1 = view[-1]; | |
3371 | unsigned char op2 = view[-2]; | |
3372 | ||
3373 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3374 | op2 == 0x8d || op2 == 0x04); |
07f397ab ILT |
3375 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
3376 | ||
152f7024 | 3377 | int roff; |
07f397ab ILT |
3378 | |
3379 | if (op2 == 0x04) | |
3380 | { | |
3381 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3382 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3383 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3384 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
152f7024 | 3385 | roff = 5; |
07f397ab ILT |
3386 | } |
3387 | else | |
3388 | { | |
152f7024 | 3389 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 10); |
07f397ab | 3390 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3391 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
152f7024 CC |
3392 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[9] == 0x90); |
3393 | roff = 6; | |
07f397ab ILT |
3394 | } |
3395 | ||
152f7024 | 3396 | memcpy(view + roff - 8, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); |
07f397ab ILT |
3397 | Relocate_functions<32, false>::rel32(view + roff, value); |
3398 | ||
3399 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3400 | // We can skip it. | |
3401 | this->skip_call_tls_get_addr_ = true; | |
3402 | } | |
3403 | ||
c2b45e22 CC |
3404 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3405 | // General-Dynamic to a Local-Exec. | |
3406 | ||
3407 | inline void | |
3408 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3409 | const Relocate_info<32, false>* relinfo, | |
3410 | size_t relnum, | |
3411 | Output_segment* tls_segment, | |
3412 | const elfcpp::Rel<32, false>& rel, | |
3413 | unsigned int r_type, | |
3414 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3415 | unsigned char* view, | |
3416 | section_size_type view_size) | |
3417 | { | |
3418 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3419 | { | |
3420 | // leal foo@TLSDESC(%ebx), %eax | |
3421 | // ==> leal foo@NTPOFF, %eax | |
3422 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3423 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3424 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3425 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3426 | view[-1] = 0x05; |
3427 | value -= tls_segment->memsz(); | |
3428 | Relocate_functions<32, false>::rel32(view, value); | |
3429 | } | |
3430 | else | |
3431 | { | |
3432 | // call *foo@TLSCALL(%eax) | |
3433 | // ==> nop; nop | |
3434 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3435 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3436 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3437 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3438 | view[0] = 0x66; |
3439 | view[1] = 0x90; | |
3440 | } | |
3441 | } | |
3442 | ||
3443 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3444 | // General-Dynamic to an Initial-Exec. | |
3445 | ||
3446 | inline void | |
3447 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3448 | const Relocate_info<32, false>* relinfo, | |
3449 | size_t relnum, | |
c2b45e22 CC |
3450 | const elfcpp::Rel<32, false>& rel, |
3451 | unsigned int r_type, | |
3452 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3453 | unsigned char* view, | |
3454 | section_size_type view_size) | |
3455 | { | |
3456 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3457 | { | |
3458 | // leal foo@TLSDESC(%ebx), %eax | |
3459 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3460 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3461 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3462 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3463 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3464 | view[-2] = 0x8b; |
3465 | Relocate_functions<32, false>::rel32(view, value); | |
3466 | } | |
3467 | else | |
3468 | { | |
3469 | // call *foo@TLSCALL(%eax) | |
3470 | // ==> nop; nop | |
3471 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3472 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3473 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3474 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3475 | view[0] = 0x66; |
3476 | view[1] = 0x90; | |
3477 | } | |
3478 | } | |
3479 | ||
46cf9fa2 ILT |
3480 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3481 | // Local-Exec. | |
3482 | ||
3483 | inline void | |
3484 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3485 | size_t relnum, | |
3486 | Output_segment*, | |
3487 | const elfcpp::Rel<32, false>& rel, | |
3488 | unsigned int, | |
3489 | elfcpp::Elf_types<32>::Elf_Addr, | |
3490 | unsigned char* view, | |
fe8718a4 | 3491 | section_size_type view_size) |
46cf9fa2 ILT |
3492 | { |
3493 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3494 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3495 | ||
af6359d5 ILT |
3496 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3497 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3498 | |
3499 | // FIXME: Does this test really always pass? | |
af6359d5 | 3500 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3501 | view[-2] == 0x8d && view[-1] == 0x83); |
46cf9fa2 | 3502 | |
af6359d5 | 3503 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3504 | |
3505 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3506 | ||
3507 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3508 | // We can skip it. | |
3509 | this->skip_call_tls_get_addr_ = true; | |
3510 | } | |
3511 | ||
56622147 ILT |
3512 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3513 | // Local-Exec. | |
3514 | ||
3515 | inline void | |
3516 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3517 | size_t relnum, | |
3518 | Output_segment* tls_segment, | |
3519 | const elfcpp::Rel<32, false>& rel, | |
3520 | unsigned int r_type, | |
3521 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3522 | unsigned char* view, | |
fe8718a4 | 3523 | section_size_type view_size) |
56622147 ILT |
3524 | { |
3525 | // We have to actually change the instructions, which means that we | |
3526 | // need to examine the opcodes to figure out which instruction we | |
3527 | // are looking at. | |
3528 | if (r_type == elfcpp::R_386_TLS_IE) | |
3529 | { | |
3530 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3531 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3532 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3533 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3534 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3535 | ||
3536 | unsigned char op1 = view[-1]; | |
3537 | if (op1 == 0xa1) | |
3538 | { | |
3539 | // movl XX,%eax ==> movl $YY,%eax | |
3540 | view[-1] = 0xb8; | |
3541 | } | |
3542 | else | |
3543 | { | |
3544 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3545 | ||
3546 | unsigned char op2 = view[-2]; | |
3547 | if (op2 == 0x8b) | |
3548 | { | |
3549 | // movl XX,%reg ==> movl $YY,%reg | |
3550 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3551 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3552 | view[-2] = 0xc7; |
3553 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3554 | } | |
3555 | else if (op2 == 0x03) | |
3556 | { | |
3557 | // addl XX,%reg ==> addl $YY,%reg | |
3558 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3559 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3560 | view[-2] = 0x81; |
3561 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3562 | } | |
3563 | else | |
3564 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3565 | } | |
3566 | } | |
3567 | else | |
3568 | { | |
3569 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3570 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3571 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3572 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3573 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3574 | ||
3575 | unsigned char op1 = view[-1]; | |
3576 | unsigned char op2 = view[-2]; | |
3577 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3578 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); |
56622147 ILT |
3579 | if (op2 == 0x8b) |
3580 | { | |
3581 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3582 | view[-2] = 0xc7; | |
3583 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3584 | } | |
3585 | else if (op2 == 0x2b) | |
3586 | { | |
3587 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3588 | view[-2] = 0x81; | |
3589 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3590 | } | |
3591 | else if (op2 == 0x03) | |
3592 | { | |
3593 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3594 | view[-2] = 0x81; | |
3595 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3596 | } | |
3597 | else | |
3598 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3599 | } | |
3600 | ||
7bf1f802 | 3601 | value = tls_segment->memsz() - value; |
56622147 ILT |
3602 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3603 | value = - value; | |
3604 | ||
3605 | Relocate_functions<32, false>::rel32(view, value); | |
3606 | } | |
3607 | ||
61ba1cf9 ILT |
3608 | // Relocate section data. |
3609 | ||
3610 | void | |
92e059d8 | 3611 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3612 | unsigned int sh_type, |
3613 | const unsigned char* prelocs, | |
3614 | size_t reloc_count, | |
730cdc88 ILT |
3615 | Output_section* output_section, |
3616 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3617 | unsigned char* view, |
3618 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3619 | section_size_type view_size, |
3620 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3621 | { |
a3ad94ed | 3622 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3623 | |
4d625b70 CC |
3624 | gold::relocate_section<32, false, Target_i386, Relocate, |
3625 | gold::Default_comdat_behavior, Classify_reloc>( | |
92e059d8 | 3626 | relinfo, |
ead1e424 | 3627 | this, |
61ba1cf9 ILT |
3628 | prelocs, |
3629 | reloc_count, | |
730cdc88 ILT |
3630 | output_section, |
3631 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3632 | view, |
3633 | address, | |
364c7fa5 ILT |
3634 | view_size, |
3635 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3636 | } |
3637 | ||
6a74a719 ILT |
3638 | // Return the size of a relocation while scanning during a relocatable |
3639 | // link. | |
3640 | ||
3641 | unsigned int | |
4d625b70 | 3642 | Target_i386::Classify_reloc::get_size_for_reloc( |
6a74a719 ILT |
3643 | unsigned int r_type, |
3644 | Relobj* object) | |
3645 | { | |
3646 | switch (r_type) | |
3647 | { | |
3648 | case elfcpp::R_386_NONE: | |
3649 | case elfcpp::R_386_GNU_VTINHERIT: | |
3650 | case elfcpp::R_386_GNU_VTENTRY: | |
3651 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3652 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3653 | case elfcpp::R_386_TLS_DESC_CALL: | |
3654 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3655 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3656 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3657 | case elfcpp::R_386_TLS_IE_32: | |
3658 | case elfcpp::R_386_TLS_GOTIE: | |
3659 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3660 | case elfcpp::R_386_TLS_LE_32: | |
3661 | return 0; | |
3662 | ||
3663 | case elfcpp::R_386_32: | |
3664 | case elfcpp::R_386_PC32: | |
3665 | case elfcpp::R_386_GOT32: | |
493d4b48 | 3666 | case elfcpp::R_386_GOT32X: |
6a74a719 ILT |
3667 | case elfcpp::R_386_PLT32: |
3668 | case elfcpp::R_386_GOTOFF: | |
3669 | case elfcpp::R_386_GOTPC: | |
3670 | return 4; | |
3671 | ||
3672 | case elfcpp::R_386_16: | |
3673 | case elfcpp::R_386_PC16: | |
3674 | return 2; | |
3675 | ||
3676 | case elfcpp::R_386_8: | |
3677 | case elfcpp::R_386_PC8: | |
3678 | return 1; | |
3679 | ||
3680 | // These are relocations which should only be seen by the | |
3681 | // dynamic linker, and should never be seen here. | |
3682 | case elfcpp::R_386_COPY: | |
3683 | case elfcpp::R_386_GLOB_DAT: | |
3684 | case elfcpp::R_386_JUMP_SLOT: | |
3685 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3686 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3687 | case elfcpp::R_386_TLS_TPOFF: |
3688 | case elfcpp::R_386_TLS_DTPMOD32: | |
3689 | case elfcpp::R_386_TLS_DTPOFF32: | |
3690 | case elfcpp::R_386_TLS_TPOFF32: | |
3691 | case elfcpp::R_386_TLS_DESC: | |
3692 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3693 | return 0; | |
3694 | ||
3695 | case elfcpp::R_386_32PLT: | |
3696 | case elfcpp::R_386_TLS_GD_32: | |
3697 | case elfcpp::R_386_TLS_GD_PUSH: | |
3698 | case elfcpp::R_386_TLS_GD_CALL: | |
3699 | case elfcpp::R_386_TLS_GD_POP: | |
3700 | case elfcpp::R_386_TLS_LDM_32: | |
3701 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3702 | case elfcpp::R_386_TLS_LDM_CALL: | |
3703 | case elfcpp::R_386_TLS_LDM_POP: | |
3704 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3705 | default: | |
3706 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3707 | return 0; | |
3708 | } | |
3709 | } | |
3710 | ||
3711 | // Scan the relocs during a relocatable link. | |
3712 | ||
3713 | void | |
ad0f2072 | 3714 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3715 | Layout* layout, |
6fa2a40b | 3716 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3717 | unsigned int data_shndx, |
3718 | unsigned int sh_type, | |
3719 | const unsigned char* prelocs, | |
3720 | size_t reloc_count, | |
3721 | Output_section* output_section, | |
3722 | bool needs_special_offset_handling, | |
3723 | size_t local_symbol_count, | |
3724 | const unsigned char* plocal_symbols, | |
3725 | Relocatable_relocs* rr) | |
3726 | { | |
4d625b70 CC |
3727 | typedef gold::Default_scan_relocatable_relocs<Classify_reloc> |
3728 | Scan_relocatable_relocs; | |
6a74a719 | 3729 | |
4d625b70 | 3730 | gold_assert(sh_type == elfcpp::SHT_REL); |
6a74a719 | 3731 | |
4d625b70 | 3732 | gold::scan_relocatable_relocs<32, false, Scan_relocatable_relocs>( |
6a74a719 ILT |
3733 | symtab, |
3734 | layout, | |
3735 | object, | |
3736 | data_shndx, | |
3737 | prelocs, | |
3738 | reloc_count, | |
3739 | output_section, | |
3740 | needs_special_offset_handling, | |
3741 | local_symbol_count, | |
3742 | plocal_symbols, | |
3743 | rr); | |
3744 | } | |
3745 | ||
4d625b70 CC |
3746 | // Scan the relocs for --emit-relocs. |
3747 | ||
3748 | void | |
3749 | Target_i386::emit_relocs_scan(Symbol_table* symtab, | |
3750 | Layout* layout, | |
3751 | Sized_relobj_file<32, false>* object, | |
3752 | unsigned int data_shndx, | |
3753 | unsigned int sh_type, | |
3754 | const unsigned char* prelocs, | |
3755 | size_t reloc_count, | |
3756 | Output_section* output_section, | |
3757 | bool needs_special_offset_handling, | |
3758 | size_t local_symbol_count, | |
3759 | const unsigned char* plocal_syms, | |
3760 | Relocatable_relocs* rr) | |
3761 | { | |
3762 | typedef gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false> | |
3763 | Classify_reloc; | |
3764 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> | |
3765 | Emit_relocs_strategy; | |
3766 | ||
3767 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3768 | ||
3769 | gold::scan_relocatable_relocs<32, false, Emit_relocs_strategy>( | |
3770 | symtab, | |
3771 | layout, | |
3772 | object, | |
3773 | data_shndx, | |
3774 | prelocs, | |
3775 | reloc_count, | |
3776 | output_section, | |
3777 | needs_special_offset_handling, | |
3778 | local_symbol_count, | |
3779 | plocal_syms, | |
3780 | rr); | |
3781 | } | |
3782 | ||
7404fe1b | 3783 | // Emit relocations for a section. |
6a74a719 ILT |
3784 | |
3785 | void | |
7404fe1b | 3786 | Target_i386::relocate_relocs( |
6a74a719 ILT |
3787 | const Relocate_info<32, false>* relinfo, |
3788 | unsigned int sh_type, | |
3789 | const unsigned char* prelocs, | |
3790 | size_t reloc_count, | |
3791 | Output_section* output_section, | |
cc928013 | 3792 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
3793 | unsigned char* view, |
3794 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3795 | section_size_type view_size, | |
3796 | unsigned char* reloc_view, | |
3797 | section_size_type reloc_view_size) | |
3798 | { | |
3799 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3800 | ||
4d625b70 | 3801 | gold::relocate_relocs<32, false, Classify_reloc>( |
6a74a719 ILT |
3802 | relinfo, |
3803 | prelocs, | |
3804 | reloc_count, | |
3805 | output_section, | |
3806 | offset_in_output_section, | |
6a74a719 ILT |
3807 | view, |
3808 | view_address, | |
3809 | view_size, | |
3810 | reloc_view, | |
3811 | reloc_view_size); | |
3812 | } | |
3813 | ||
ab5c9e90 ILT |
3814 | // Return the value to use for a dynamic which requires special |
3815 | // treatment. This is how we support equality comparisons of function | |
3816 | // pointers across shared library boundaries, as described in the | |
3817 | // processor specific ABI supplement. | |
3818 | ||
3819 | uint64_t | |
3820 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3821 | { | |
3822 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 3823 | return this->plt_address_for_global(gsym); |
ab5c9e90 ILT |
3824 | } |
3825 | ||
c51e6221 ILT |
3826 | // Return a string used to fill a code section with nops to take up |
3827 | // the specified length. | |
3828 | ||
3829 | std::string | |
8851ecca | 3830 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3831 | { |
3832 | if (length >= 16) | |
3833 | { | |
3834 | // Build a jmp instruction to skip over the bytes. | |
3835 | unsigned char jmp[5]; | |
3836 | jmp[0] = 0xe9; | |
3837 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3838 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2e702c99 | 3839 | + std::string(length - 5, static_cast<char>(0x90))); |
c51e6221 ILT |
3840 | } |
3841 | ||
3842 | // Nop sequences of various lengths. | |
76677ad0 CC |
3843 | const char nop1[1] = { '\x90' }; // nop |
3844 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3845 | const char nop3[3] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi | |
3846 | const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
3847 | '\x00'}; | |
3848 | const char nop5[5] = { '\x90', '\x8d', '\x74', // nop | |
2e702c99 | 3849 | '\x26', '\x00' }; // leal 0(%esi,1),%esi |
76677ad0 | 3850 | const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi |
2e702c99 | 3851 | '\x00', '\x00', '\x00' }; |
76677ad0 | 3852 | const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3853 | '\x00', '\x00', '\x00', |
76677ad0 CC |
3854 | '\x00' }; |
3855 | const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop | |
2e702c99 | 3856 | '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi |
76677ad0 CC |
3857 | '\x00', '\x00' }; |
3858 | const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi | |
2e702c99 | 3859 | '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3860 | '\x00', '\x00', '\x00' }; |
3861 | const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi | |
2e702c99 | 3862 | '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3863 | '\x00', '\x00', '\x00', |
3864 | '\x00' }; | |
3865 | const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
2e702c99 | 3866 | '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3867 | '\x27', '\x00', '\x00', |
3868 | '\x00', '\x00' }; | |
3869 | const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3870 | '\x00', '\x00', '\x00', // leal 0L(%edi),%edi |
76677ad0 CC |
3871 | '\x8d', '\xbf', '\x00', |
3872 | '\x00', '\x00', '\x00' }; | |
3873 | const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3874 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3875 | '\x8d', '\xbc', '\x27', |
3876 | '\x00', '\x00', '\x00', | |
2e702c99 | 3877 | '\x00' }; |
76677ad0 | 3878 | const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3879 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3880 | '\x00', '\x8d', '\xbc', |
3881 | '\x27', '\x00', '\x00', | |
2e702c99 | 3882 | '\x00', '\x00' }; |
76677ad0 | 3883 | const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15 |
2e702c99 | 3884 | '\x90', '\x90', '\x90', // nop,nop,nop,... |
76677ad0 CC |
3885 | '\x90', '\x90', '\x90', |
3886 | '\x90', '\x90', '\x90', | |
2e702c99 | 3887 | '\x90', '\x90', '\x90' }; |
c51e6221 ILT |
3888 | |
3889 | const char* nops[16] = { | |
3890 | NULL, | |
3891 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3892 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3893 | }; | |
3894 | ||
3895 | return std::string(nops[length], length); | |
3896 | } | |
3897 | ||
02d7cd44 ILT |
3898 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3899 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3900 | // assembler can not write out the difference between two labels in | |
3901 | // different sections, so instead of using a pc-relative value they | |
3902 | // use an offset from the GOT. | |
3903 | ||
3904 | uint64_t | |
3905 | Target_i386::do_ehframe_datarel_base() const | |
3906 | { | |
3907 | gold_assert(this->global_offset_table_ != NULL); | |
3908 | Symbol* sym = this->global_offset_table_; | |
3909 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3910 | return ssym->value(); | |
3911 | } | |
3912 | ||
b6848d3c ILT |
3913 | // Return whether SYM should be treated as a call to a non-split |
3914 | // function. We don't want that to be true of a call to a | |
3915 | // get_pc_thunk function. | |
3916 | ||
3917 | bool | |
4d625b70 CC |
3918 | Target_i386::do_is_call_to_non_split(const Symbol* sym, |
3919 | const unsigned char*) const | |
b6848d3c ILT |
3920 | { |
3921 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3922 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3923 | } | |
3924 | ||
364c7fa5 | 3925 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3926 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3927 | // code. We have to change the function so that it always ensures |
3928 | // that it has enough stack space to run some random function. | |
3929 | ||
3930 | void | |
3931 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2e702c99 RM |
3932 | section_offset_type fnoffset, |
3933 | section_size_type fnsize, | |
6e0813d3 CC |
3934 | const unsigned char*, |
3935 | size_t, | |
2e702c99 RM |
3936 | unsigned char* view, |
3937 | section_size_type view_size, | |
3938 | std::string* from, | |
3939 | std::string* to) const | |
364c7fa5 ILT |
3940 | { |
3941 | // The function starts with a comparison of the stack pointer and a | |
3942 | // field in the TCB. This is followed by a jump. | |
3943 | ||
3944 | // cmp %gs:NN,%esp | |
3945 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3946 | && fnsize > 7) | |
3947 | { | |
3948 | // We will call __morestack if the carry flag is set after this | |
3949 | // comparison. We turn the comparison into an stc instruction | |
3950 | // and some nops. | |
3951 | view[fnoffset] = '\xf9'; | |
3952 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3953 | } | |
3954 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3955 | // lea NN(%esp),%edx |
3956 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3957 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3958 | && fnsize > 7) |
3959 | { | |
3960 | // This is loading an offset from the stack pointer for a | |
3961 | // comparison. The offset is negative, so we decrease the | |
3962 | // offset by the amount of space we need for the stack. This | |
3963 | // means we will avoid calling __morestack if there happens to | |
3964 | // be plenty of space on the stack already. | |
3965 | unsigned char* pval = view + fnoffset + 3; | |
3966 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3967 | val -= parameters->options().split_stack_adjust_size(); | |
3968 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3969 | } | |
3970 | else | |
3971 | { | |
3972 | if (!object->has_no_split_stack()) | |
3973 | object->error(_("failed to match split-stack sequence at " | |
3974 | "section %u offset %0zx"), | |
ac33a407 | 3975 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3976 | return; |
3977 | } | |
3978 | ||
3979 | // We have to change the function so that it calls | |
3980 | // __morestack_non_split instead of __morestack. The former will | |
3981 | // allocate additional stack space. | |
3982 | *from = "__morestack"; | |
3983 | *to = "__morestack_non_split"; | |
3984 | } | |
3985 | ||
2e702c99 RM |
3986 | // The selector for i386 object files. Note this is never instantiated |
3987 | // directly. It's only used in Target_selector_i386_nacl, below. | |
14bfc3f5 | 3988 | |
36959681 | 3989 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3990 | { |
3991 | public: | |
3992 | Target_selector_i386() | |
36959681 | 3993 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3994 | "elf32-i386", "elf32-i386-freebsd", |
3995 | "elf_i386") | |
14bfc3f5 ILT |
3996 | { } |
3997 | ||
3998 | Target* | |
e96caa79 ILT |
3999 | do_instantiate_target() |
4000 | { return new Target_i386(); } | |
14bfc3f5 ILT |
4001 | }; |
4002 | ||
2e702c99 RM |
4003 | // NaCl variant. It uses different PLT contents. |
4004 | ||
4005 | class Output_data_plt_i386_nacl : public Output_data_plt_i386 | |
4006 | { | |
4007 | public: | |
4008 | Output_data_plt_i386_nacl(Layout* layout, | |
57b2284c | 4009 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4010 | Output_data_space* got_irelative) |
4011 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
4012 | { } | |
4013 | ||
4014 | protected: | |
4015 | virtual unsigned int | |
4016 | do_get_plt_entry_size() const | |
4017 | { return plt_entry_size; } | |
4018 | ||
4019 | virtual void | |
4020 | do_add_eh_frame(Layout* layout) | |
4021 | { | |
4022 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
4023 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
4024 | } | |
4025 | ||
4026 | // The size of an entry in the PLT. | |
4027 | static const int plt_entry_size = 64; | |
4028 | ||
4029 | // The .eh_frame unwind information for the PLT. | |
4030 | static const int plt_eh_frame_fde_size = 32; | |
4031 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
4032 | }; | |
4033 | ||
4034 | class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl | |
4035 | { | |
4036 | public: | |
4037 | Output_data_plt_i386_nacl_exec(Layout* layout, | |
57b2284c | 4038 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4039 | Output_data_space* got_irelative) |
4040 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
4041 | { } | |
4042 | ||
4043 | protected: | |
4044 | virtual void | |
4045 | do_fill_first_plt_entry(unsigned char* pov, | |
4046 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
4047 | ||
4048 | virtual unsigned int | |
4049 | do_fill_plt_entry(unsigned char* pov, | |
4050 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4051 | unsigned int got_offset, | |
4052 | unsigned int plt_offset, | |
4053 | unsigned int plt_rel_offset); | |
4054 | ||
4055 | private: | |
4056 | // The first entry in the PLT for an executable. | |
4057 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4058 | ||
4059 | // Other entries in the PLT for an executable. | |
4060 | static const unsigned char plt_entry[plt_entry_size]; | |
4061 | }; | |
4062 | ||
4063 | class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl | |
4064 | { | |
4065 | public: | |
4066 | Output_data_plt_i386_nacl_dyn(Layout* layout, | |
57b2284c | 4067 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4068 | Output_data_space* got_irelative) |
4069 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
4070 | { } | |
4071 | ||
4072 | protected: | |
4073 | virtual void | |
4074 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
4075 | ||
4076 | virtual unsigned int | |
4077 | do_fill_plt_entry(unsigned char* pov, | |
4078 | elfcpp::Elf_types<32>::Elf_Addr, | |
4079 | unsigned int got_offset, | |
4080 | unsigned int plt_offset, | |
4081 | unsigned int plt_rel_offset); | |
4082 | ||
4083 | private: | |
4084 | // The first entry in the PLT for a shared object. | |
4085 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4086 | ||
4087 | // Other entries in the PLT for a shared object. | |
4088 | static const unsigned char plt_entry[plt_entry_size]; | |
4089 | }; | |
4090 | ||
4091 | class Target_i386_nacl : public Target_i386 | |
4092 | { | |
4093 | public: | |
4094 | Target_i386_nacl() | |
4095 | : Target_i386(&i386_nacl_info) | |
4096 | { } | |
4097 | ||
4098 | protected: | |
4099 | virtual Output_data_plt_i386* | |
4100 | do_make_data_plt(Layout* layout, | |
57b2284c | 4101 | Output_data_got_plt_i386* got_plt, |
2e702c99 RM |
4102 | Output_data_space* got_irelative, |
4103 | bool dyn) | |
4104 | { | |
4105 | if (dyn) | |
4106 | return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative); | |
4107 | else | |
4108 | return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative); | |
4109 | } | |
4110 | ||
93f8221c RM |
4111 | virtual std::string |
4112 | do_code_fill(section_size_type length) const; | |
4113 | ||
2e702c99 RM |
4114 | private: |
4115 | static const Target::Target_info i386_nacl_info; | |
4116 | }; | |
4117 | ||
4118 | const Target::Target_info Target_i386_nacl::i386_nacl_info = | |
4119 | { | |
4120 | 32, // size | |
4121 | false, // is_big_endian | |
4122 | elfcpp::EM_386, // machine_code | |
4123 | false, // has_make_symbol | |
4124 | false, // has_resolve | |
4125 | true, // has_code_fill | |
4126 | true, // is_default_stack_executable | |
4127 | true, // can_icf_inline_merge_sections | |
4128 | '\0', // wrap_char | |
4129 | "/lib/ld-nacl-x86-32.so.1", // dynamic_linker | |
4130 | 0x20000, // default_text_segment_address | |
4131 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4132 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4133 | true, // isolate_execinstr | |
4134 | 0x10000000, // rosegment_gap | |
4135 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4136 | elfcpp::SHN_UNDEF, // large_common_shndx | |
4137 | 0, // small_common_section_flags | |
4138 | 0, // large_common_section_flags | |
4139 | NULL, // attributes_section | |
a67858e0 | 4140 | NULL, // attributes_vendor |
8d9743bd MK |
4141 | "_start", // entry_symbol_name |
4142 | 32, // hash_entry_size | |
2e702c99 RM |
4143 | }; |
4144 | ||
4145 | #define NACLMASK 0xe0 // 32-byte alignment mask | |
4146 | ||
4147 | const unsigned char | |
4148 | Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] = | |
4149 | { | |
4150 | 0xff, 0x35, // pushl contents of memory address | |
4151 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
4152 | 0x8b, 0x0d, // movl contents of address, %ecx | |
4153 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4154 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4155 | 0xff, 0xe1, // jmp *%ecx | |
4156 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4157 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4158 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4159 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4160 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4161 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4162 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4163 | 0x90, 0x90, 0x90, 0x90, 0x90 | |
4164 | }; | |
4165 | ||
4166 | void | |
4167 | Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry( | |
4168 | unsigned char* pov, | |
4169 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
4170 | { | |
4171 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4172 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
4173 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
4174 | } | |
4175 | ||
4176 | // The first entry in the PLT for a shared object. | |
4177 | ||
4178 | const unsigned char | |
4179 | Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] = | |
4180 | { | |
4181 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
4182 | 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx | |
4183 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4184 | 0xff, 0xe1, // jmp *%ecx | |
4185 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4186 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4187 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4188 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4189 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4190 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4191 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4192 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4193 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4194 | 0x90, 0x90, 0x90, 0x90, 0x90 // nops | |
4195 | }; | |
4196 | ||
4197 | void | |
4198 | Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry( | |
4199 | unsigned char* pov, | |
4200 | elfcpp::Elf_types<32>::Elf_Addr) | |
4201 | { | |
4202 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4203 | } | |
4204 | ||
4205 | // Subsequent entries in the PLT for an executable. | |
4206 | ||
4207 | const unsigned char | |
4208 | Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] = | |
4209 | { | |
4210 | 0x8b, 0x0d, // movl contents of address, %ecx */ | |
4211 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4212 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4213 | 0xff, 0xe1, // jmp *%ecx | |
4214 | ||
4215 | // Pad to the next 32-byte boundary with nop instructions. | |
4216 | 0x90, | |
4217 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4218 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4219 | ||
4220 | // Lazy GOT entries point here (32-byte aligned). | |
4221 | 0x68, // pushl immediate | |
4222 | 0, 0, 0, 0, // replaced with offset into relocation table | |
4223 | 0xe9, // jmp relative | |
4224 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
4225 | ||
4226 | // Pad to the next 32-byte boundary with nop instructions. | |
4227 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4228 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4229 | 0x90, 0x90 | |
4230 | }; | |
4231 | ||
4232 | unsigned int | |
4233 | Output_data_plt_i386_nacl_exec::do_fill_plt_entry( | |
4234 | unsigned char* pov, | |
4235 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4236 | unsigned int got_offset, | |
4237 | unsigned int plt_offset, | |
4238 | unsigned int plt_rel_offset) | |
4239 | { | |
4240 | memcpy(pov, plt_entry, plt_entry_size); | |
4241 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4242 | got_address + got_offset); | |
4243 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4244 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4245 | return 32; | |
4246 | } | |
4247 | ||
4248 | // Subsequent entries in the PLT for a shared object. | |
4249 | ||
4250 | const unsigned char | |
4251 | Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] = | |
4252 | { | |
4253 | 0x8b, 0x8b, // movl offset(%ebx), %ecx | |
4254 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
4255 | 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx | |
4256 | 0xff, 0xe1, // jmp *%ecx | |
4257 | ||
4258 | // Pad to the next 32-byte boundary with nop instructions. | |
4259 | 0x90, | |
4260 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4261 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4262 | ||
4263 | // Lazy GOT entries point here (32-byte aligned). | |
4264 | 0x68, // pushl immediate | |
4265 | 0, 0, 0, 0, // replaced with offset into relocation table. | |
4266 | 0xe9, // jmp relative | |
4267 | 0, 0, 0, 0, // replaced with offset to start of .plt. | |
4268 | ||
4269 | // Pad to the next 32-byte boundary with nop instructions. | |
4270 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4271 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4272 | 0x90, 0x90 | |
4273 | }; | |
4274 | ||
4275 | unsigned int | |
4276 | Output_data_plt_i386_nacl_dyn::do_fill_plt_entry( | |
4277 | unsigned char* pov, | |
4278 | elfcpp::Elf_types<32>::Elf_Addr, | |
4279 | unsigned int got_offset, | |
4280 | unsigned int plt_offset, | |
4281 | unsigned int plt_rel_offset) | |
4282 | { | |
4283 | memcpy(pov, plt_entry, plt_entry_size); | |
4284 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
4285 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4286 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4287 | return 32; | |
4288 | } | |
4289 | ||
4290 | const unsigned char | |
4291 | Output_data_plt_i386_nacl::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4292 | { | |
4293 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4294 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4295 | 0, // Augmentation size. | |
4296 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
4297 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4298 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
4299 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4300 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4301 | 13, // Block length. | |
4302 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
4303 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
4304 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4305 | elfcpp::DW_OP_and, // & (%eip & 0x3f). | |
4306 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4307 | elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25) | |
4308 | elfcpp::DW_OP_lit2, // Push 2. | |
4309 | elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2) | |
4310 | elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4 | |
4311 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4312 | elfcpp::DW_CFA_nop | |
4313 | }; | |
4314 | ||
93f8221c RM |
4315 | // Return a string used to fill a code section with nops. |
4316 | // For NaCl, long NOPs are only valid if they do not cross | |
4317 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
4318 | std::string | |
4319 | Target_i386_nacl::do_code_fill(section_size_type length) const | |
4320 | { | |
4321 | return std::string(length, static_cast<char>(0x90)); | |
4322 | } | |
4323 | ||
2e702c99 RM |
4324 | // The selector for i386-nacl object files. |
4325 | ||
4326 | class Target_selector_i386_nacl | |
4327 | : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl> | |
4328 | { | |
4329 | public: | |
4330 | Target_selector_i386_nacl() | |
4331 | : Target_selector_nacl<Target_selector_i386, | |
4332 | Target_i386_nacl>("x86-32", | |
4333 | "elf32-i386-nacl", | |
4334 | "elf_i386_nacl") | |
4335 | { } | |
4336 | }; | |
4337 | ||
4338 | Target_selector_i386_nacl target_selector_i386; | |
14bfc3f5 | 4339 | |
01f573ad L |
4340 | // IAMCU variant. It uses EM_IAMCU, not EM_386. |
4341 | ||
4342 | class Target_iamcu : public Target_i386 | |
4343 | { | |
4344 | public: | |
4345 | Target_iamcu() | |
4346 | : Target_i386(&iamcu_info) | |
4347 | { } | |
4348 | ||
4349 | private: | |
4350 | // Information about this specific target which we pass to the | |
4351 | // general Target structure. | |
4352 | static const Target::Target_info iamcu_info; | |
4353 | }; | |
4354 | ||
4355 | const Target::Target_info Target_iamcu::iamcu_info = | |
4356 | { | |
4357 | 32, // size | |
4358 | false, // is_big_endian | |
4359 | elfcpp::EM_IAMCU, // machine_code | |
4360 | false, // has_make_symbol | |
4361 | false, // has_resolve | |
4362 | true, // has_code_fill | |
4363 | true, // is_default_stack_executable | |
4364 | true, // can_icf_inline_merge_sections | |
4365 | '\0', // wrap_char | |
4366 | "/usr/lib/libc.so.1", // dynamic_linker | |
4367 | 0x08048000, // default_text_segment_address | |
4368 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
4369 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
4370 | false, // isolate_execinstr | |
4371 | 0, // rosegment_gap | |
4372 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4373 | elfcpp::SHN_UNDEF, // large_common_shndx | |
4374 | 0, // small_common_section_flags | |
4375 | 0, // large_common_section_flags | |
4376 | NULL, // attributes_section | |
4377 | NULL, // attributes_vendor | |
8d9743bd MK |
4378 | "_start", // entry_symbol_name |
4379 | 32, // hash_entry_size | |
01f573ad L |
4380 | }; |
4381 | ||
4382 | class Target_selector_iamcu : public Target_selector | |
4383 | { | |
4384 | public: | |
4385 | Target_selector_iamcu() | |
4386 | : Target_selector(elfcpp::EM_IAMCU, 32, false, "elf32-iamcu", | |
4387 | "elf_iamcu") | |
4388 | { } | |
4389 | ||
4390 | Target* | |
4391 | do_instantiate_target() | |
4392 | { return new Target_iamcu(); } | |
4393 | }; | |
4394 | ||
4395 | Target_selector_iamcu target_selector_iamcu; | |
4396 | ||
14bfc3f5 | 4397 | } // End anonymous namespace. |