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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
9dee3b3c ILT |
3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
4 | // Free Software Foundation, Inc. | |
6cb15b7f ILT |
5 | // Written by Ian Lance Taylor <iant@google.com>. |
6 | ||
7 | // This file is part of gold. | |
8 | ||
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; either version 3 of the License, or | |
12 | // (at your option) any later version. | |
13 | ||
14 | // This program is distributed in the hope that it will be useful, | |
15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License | |
20 | // along with this program; if not, write to the Free Software | |
21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | // MA 02110-1301, USA. | |
23 | ||
14bfc3f5 | 24 | #include "gold.h" |
ead1e424 ILT |
25 | |
26 | #include <cstring> | |
27 | ||
14bfc3f5 | 28 | #include "elfcpp.h" |
07a60597 | 29 | #include "dwarf.h" |
7e1edb90 | 30 | #include "parameters.h" |
92e059d8 | 31 | #include "reloc.h" |
61ba1cf9 ILT |
32 | #include "i386.h" |
33 | #include "object.h" | |
ead1e424 | 34 | #include "symtab.h" |
92e059d8 ILT |
35 | #include "layout.h" |
36 | #include "output.h" | |
12c0daef | 37 | #include "copy-relocs.h" |
14bfc3f5 | 38 | #include "target.h" |
61ba1cf9 | 39 | #include "target-reloc.h" |
14bfc3f5 | 40 | #include "target-select.h" |
af6359d5 | 41 | #include "tls.h" |
36959681 | 42 | #include "freebsd.h" |
2e702c99 | 43 | #include "nacl.h" |
f345227a | 44 | #include "gc.h" |
14bfc3f5 ILT |
45 | |
46 | namespace | |
47 | { | |
48 | ||
49 | using namespace gold; | |
50 | ||
7223e9ca | 51 | // A class to handle the PLT data. |
2e702c99 RM |
52 | // This is an abstract base class that handles most of the linker details |
53 | // but does not know the actual contents of PLT entries. The derived | |
54 | // classes below fill in those details. | |
7223e9ca ILT |
55 | |
56 | class Output_data_plt_i386 : public Output_section_data | |
57 | { | |
58 | public: | |
59 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
60 | ||
2e702c99 RM |
61 | Output_data_plt_i386(Layout*, uint64_t addralign, |
62 | Output_data_space*, Output_data_space*); | |
7223e9ca ILT |
63 | |
64 | // Add an entry to the PLT. | |
65 | void | |
67181c72 | 66 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
67 | |
68 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
69 | unsigned int | |
67181c72 ILT |
70 | add_local_ifunc_entry(Symbol_table*, Layout*, |
71 | Sized_relobj_file<32, false>* relobj, | |
7223e9ca ILT |
72 | unsigned int local_sym_index); |
73 | ||
74 | // Return the .rel.plt section data. | |
75 | Reloc_section* | |
76 | rel_plt() const | |
77 | { return this->rel_; } | |
78 | ||
79 | // Return where the TLS_DESC relocations should go. | |
80 | Reloc_section* | |
81 | rel_tls_desc(Layout*); | |
82 | ||
67181c72 ILT |
83 | // Return where the IRELATIVE relocations should go. |
84 | Reloc_section* | |
85 | rel_irelative(Symbol_table*, Layout*); | |
86 | ||
87 | // Return whether we created a section for IRELATIVE relocations. | |
88 | bool | |
89 | has_irelative_section() const | |
90 | { return this->irelative_rel_ != NULL; } | |
91 | ||
7223e9ca ILT |
92 | // Return the number of PLT entries. |
93 | unsigned int | |
94 | entry_count() const | |
67181c72 | 95 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
96 | |
97 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 98 | unsigned int |
7223e9ca | 99 | first_plt_entry_offset() |
2e702c99 | 100 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
101 | |
102 | // Return the size of a PLT entry. | |
2e702c99 RM |
103 | unsigned int |
104 | get_plt_entry_size() const | |
105 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 106 | |
67181c72 ILT |
107 | // Return the PLT address to use for a global symbol. |
108 | uint64_t | |
109 | address_for_global(const Symbol*); | |
110 | ||
111 | // Return the PLT address to use for a local symbol. | |
112 | uint64_t | |
113 | address_for_local(const Relobj*, unsigned int symndx); | |
114 | ||
2e702c99 | 115 | // Add .eh_frame information for the PLT. |
7223e9ca | 116 | void |
2e702c99 RM |
117 | add_eh_frame(Layout* layout) |
118 | { this->do_add_eh_frame(layout); } | |
7223e9ca | 119 | |
2e702c99 RM |
120 | protected: |
121 | // Fill the first PLT entry, given the pointer to the PLT section data | |
122 | // and the runtime address of the GOT. | |
7223e9ca | 123 | void |
2e702c99 RM |
124 | fill_first_plt_entry(unsigned char* pov, |
125 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
126 | { this->do_fill_first_plt_entry(pov, got_address); } | |
127 | ||
128 | // Fill a normal PLT entry, given the pointer to the entry's data in the | |
129 | // section, the runtime address of the GOT, the offset into the GOT of | |
130 | // the corresponding slot, the offset into the relocation section of the | |
131 | // corresponding reloc, and the offset of this entry within the whole | |
132 | // PLT. Return the offset from this PLT entry's runtime address that | |
133 | // should be used to compute the initial value of the GOT slot. | |
134 | unsigned int | |
135 | fill_plt_entry(unsigned char* pov, | |
136 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
137 | unsigned int got_offset, | |
138 | unsigned int plt_offset, | |
139 | unsigned int plt_rel_offset) | |
140 | { | |
141 | return this->do_fill_plt_entry(pov, got_address, got_offset, | |
142 | plt_offset, plt_rel_offset); | |
143 | } | |
7223e9ca | 144 | |
2e702c99 RM |
145 | virtual unsigned int |
146 | do_get_plt_entry_size() const = 0; | |
7223e9ca | 147 | |
2e702c99 RM |
148 | virtual void |
149 | do_fill_first_plt_entry(unsigned char* pov, | |
150 | elfcpp::Elf_types<32>::Elf_Addr got_address) = 0; | |
7223e9ca | 151 | |
2e702c99 RM |
152 | virtual unsigned int |
153 | do_fill_plt_entry(unsigned char* pov, | |
154 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
155 | unsigned int got_offset, | |
156 | unsigned int plt_offset, | |
157 | unsigned int plt_rel_offset) = 0; | |
7223e9ca | 158 | |
2e702c99 RM |
159 | virtual void |
160 | do_add_eh_frame(Layout*) = 0; | |
7223e9ca | 161 | |
2e702c99 RM |
162 | void |
163 | do_adjust_output_section(Output_section* os); | |
164 | ||
165 | // Write to a map file. | |
166 | void | |
167 | do_print_to_mapfile(Mapfile* mapfile) const | |
168 | { mapfile->print_output_data(this, _("** PLT")); } | |
07a60597 ILT |
169 | |
170 | // The .eh_frame unwind information for the PLT. | |
2e702c99 | 171 | // The CIE is common across variants of the PLT format. |
07a60597 | 172 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 173 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 174 | |
2e702c99 | 175 | private: |
7223e9ca ILT |
176 | // Set the final size. |
177 | void | |
178 | set_final_data_size() | |
67181c72 ILT |
179 | { |
180 | this->set_data_size((this->count_ + this->irelative_count_ + 1) | |
2e702c99 | 181 | * this->get_plt_entry_size()); |
67181c72 | 182 | } |
7223e9ca ILT |
183 | |
184 | // Write out the PLT data. | |
185 | void | |
186 | do_write(Output_file*); | |
187 | ||
188 | // We keep a list of global STT_GNU_IFUNC symbols, each with its | |
189 | // offset in the GOT. | |
190 | struct Global_ifunc | |
191 | { | |
192 | Symbol* sym; | |
193 | unsigned int got_offset; | |
194 | }; | |
195 | ||
196 | // We keep a list of local STT_GNU_IFUNC symbols, each with its | |
197 | // offset in the GOT. | |
198 | struct Local_ifunc | |
199 | { | |
6fa2a40b | 200 | Sized_relobj_file<32, false>* object; |
7223e9ca ILT |
201 | unsigned int local_sym_index; |
202 | unsigned int got_offset; | |
203 | }; | |
204 | ||
7d172687 ILT |
205 | // A pointer to the Layout class, so that we can find the .dynamic |
206 | // section when we write out the GOT PLT section. | |
207 | Layout* layout_; | |
7223e9ca ILT |
208 | // The reloc section. |
209 | Reloc_section* rel_; | |
210 | // The TLS_DESC relocations, if necessary. These must follow the | |
211 | // regular PLT relocs. | |
212 | Reloc_section* tls_desc_rel_; | |
67181c72 ILT |
213 | // The IRELATIVE relocations, if necessary. These must follow the |
214 | // regular relocatoins and the TLS_DESC relocations. | |
215 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
216 | // The .got.plt section. |
217 | Output_data_space* got_plt_; | |
67181c72 ILT |
218 | // The part of the .got.plt section used for IRELATIVE relocs. |
219 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
220 | // The number of PLT entries. |
221 | unsigned int count_; | |
67181c72 ILT |
222 | // Number of PLT entries with R_386_IRELATIVE relocs. These follow |
223 | // the regular PLT entries. | |
224 | unsigned int irelative_count_; | |
7223e9ca ILT |
225 | // Global STT_GNU_IFUNC symbols. |
226 | std::vector<Global_ifunc> global_ifuncs_; | |
227 | // Local STT_GNU_IFUNC symbols. | |
228 | std::vector<Local_ifunc> local_ifuncs_; | |
229 | }; | |
a3ad94ed | 230 | |
2e702c99 RM |
231 | // This is an abstract class for the standard PLT layout. |
232 | // The derived classes below handle the actual PLT contents | |
233 | // for the executable (non-PIC) and shared-library (PIC) cases. | |
234 | // The unwind information is uniform across those two, so it's here. | |
235 | ||
236 | class Output_data_plt_i386_standard : public Output_data_plt_i386 | |
237 | { | |
238 | public: | |
239 | Output_data_plt_i386_standard(Layout* layout, | |
240 | Output_data_space* got_plt, | |
241 | Output_data_space* got_irelative) | |
242 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
243 | { } | |
244 | ||
245 | protected: | |
246 | virtual unsigned int | |
247 | do_get_plt_entry_size() const | |
248 | { return plt_entry_size; } | |
249 | ||
250 | virtual void | |
251 | do_add_eh_frame(Layout* layout) | |
252 | { | |
253 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
254 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
255 | } | |
256 | ||
257 | // The size of an entry in the PLT. | |
258 | static const int plt_entry_size = 16; | |
259 | ||
260 | // The .eh_frame unwind information for the PLT. | |
261 | static const int plt_eh_frame_fde_size = 32; | |
262 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
263 | }; | |
264 | ||
265 | // Actually fill the PLT contents for an executable (non-PIC). | |
266 | ||
267 | class Output_data_plt_i386_exec : public Output_data_plt_i386_standard | |
268 | { | |
269 | public: | |
270 | Output_data_plt_i386_exec(Layout* layout, | |
271 | Output_data_space* got_plt, | |
272 | Output_data_space* got_irelative) | |
273 | : Output_data_plt_i386_standard(layout, got_plt, got_irelative) | |
274 | { } | |
275 | ||
276 | protected: | |
277 | virtual void | |
278 | do_fill_first_plt_entry(unsigned char* pov, | |
279 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
280 | ||
281 | virtual unsigned int | |
282 | do_fill_plt_entry(unsigned char* pov, | |
283 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
284 | unsigned int got_offset, | |
285 | unsigned int plt_offset, | |
286 | unsigned int plt_rel_offset); | |
287 | ||
288 | private: | |
289 | // The first entry in the PLT for an executable. | |
290 | static const unsigned char first_plt_entry[plt_entry_size]; | |
291 | ||
292 | // Other entries in the PLT for an executable. | |
293 | static const unsigned char plt_entry[plt_entry_size]; | |
294 | }; | |
295 | ||
296 | // Actually fill the PLT contents for a shared library (PIC). | |
297 | ||
298 | class Output_data_plt_i386_dyn : public Output_data_plt_i386_standard | |
299 | { | |
300 | public: | |
301 | Output_data_plt_i386_dyn(Layout* layout, | |
302 | Output_data_space* got_plt, | |
303 | Output_data_space* got_irelative) | |
304 | : Output_data_plt_i386_standard(layout, got_plt, got_irelative) | |
305 | { } | |
306 | ||
307 | protected: | |
308 | virtual void | |
309 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
310 | ||
311 | virtual unsigned int | |
312 | do_fill_plt_entry(unsigned char* pov, | |
313 | elfcpp::Elf_types<32>::Elf_Addr, | |
314 | unsigned int got_offset, | |
315 | unsigned int plt_offset, | |
316 | unsigned int plt_rel_offset); | |
317 | ||
318 | private: | |
319 | // The first entry in the PLT for a shared object. | |
320 | static const unsigned char first_plt_entry[plt_entry_size]; | |
321 | ||
322 | // Other entries in the PLT for a shared object. | |
323 | static const unsigned char plt_entry[plt_entry_size]; | |
324 | }; | |
325 | ||
14bfc3f5 | 326 | // The i386 target class. |
e041f13d ILT |
327 | // TLS info comes from |
328 | // http://people.redhat.com/drepper/tls.pdf | |
329 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 330 | |
200b2bb9 | 331 | class Target_i386 : public Sized_target<32, false> |
14bfc3f5 ILT |
332 | { |
333 | public: | |
5a6f7e2d ILT |
334 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
335 | ||
2e702c99 RM |
336 | Target_i386(const Target::Target_info* info = &i386_info) |
337 | : Sized_target<32, false>(info), | |
67181c72 ILT |
338 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
339 | got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL), | |
340 | rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 341 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 342 | { } |
75f65a3e | 343 | |
2e702c99 | 344 | // Process the relocations to determine unreferenced sections for |
6d03d481 ST |
345 | // garbage collection. |
346 | void | |
ad0f2072 | 347 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
348 | Layout* layout, |
349 | Sized_relobj_file<32, false>* object, | |
350 | unsigned int data_shndx, | |
351 | unsigned int sh_type, | |
352 | const unsigned char* prelocs, | |
353 | size_t reloc_count, | |
354 | Output_section* output_section, | |
355 | bool needs_special_offset_handling, | |
356 | size_t local_symbol_count, | |
357 | const unsigned char* plocal_symbols); | |
6d03d481 | 358 | |
92e059d8 | 359 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 360 | void |
ad0f2072 | 361 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 362 | Layout* layout, |
6fa2a40b | 363 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 364 | unsigned int data_shndx, |
92e059d8 ILT |
365 | unsigned int sh_type, |
366 | const unsigned char* prelocs, | |
367 | size_t reloc_count, | |
730cdc88 ILT |
368 | Output_section* output_section, |
369 | bool needs_special_offset_handling, | |
92e059d8 | 370 | size_t local_symbol_count, |
730cdc88 | 371 | const unsigned char* plocal_symbols); |
61ba1cf9 | 372 | |
5a6f7e2d ILT |
373 | // Finalize the sections. |
374 | void | |
f59f41f3 | 375 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 376 | |
ab5c9e90 ILT |
377 | // Return the value to use for a dynamic which requires special |
378 | // treatment. | |
379 | uint64_t | |
380 | do_dynsym_value(const Symbol*) const; | |
381 | ||
92e059d8 ILT |
382 | // Relocate a section. |
383 | void | |
384 | relocate_section(const Relocate_info<32, false>*, | |
385 | unsigned int sh_type, | |
386 | const unsigned char* prelocs, | |
387 | size_t reloc_count, | |
730cdc88 ILT |
388 | Output_section* output_section, |
389 | bool needs_special_offset_handling, | |
92e059d8 ILT |
390 | unsigned char* view, |
391 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
392 | section_size_type view_size, |
393 | const Reloc_symbol_changes*); | |
92e059d8 | 394 | |
6a74a719 ILT |
395 | // Scan the relocs during a relocatable link. |
396 | void | |
ad0f2072 | 397 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 398 | Layout* layout, |
6fa2a40b | 399 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
400 | unsigned int data_shndx, |
401 | unsigned int sh_type, | |
402 | const unsigned char* prelocs, | |
403 | size_t reloc_count, | |
404 | Output_section* output_section, | |
405 | bool needs_special_offset_handling, | |
406 | size_t local_symbol_count, | |
407 | const unsigned char* plocal_symbols, | |
408 | Relocatable_relocs*); | |
409 | ||
7404fe1b | 410 | // Emit relocations for a section. |
6a74a719 | 411 | void |
7404fe1b AM |
412 | relocate_relocs(const Relocate_info<32, false>*, |
413 | unsigned int sh_type, | |
414 | const unsigned char* prelocs, | |
415 | size_t reloc_count, | |
416 | Output_section* output_section, | |
417 | off_t offset_in_output_section, | |
418 | const Relocatable_relocs*, | |
419 | unsigned char* view, | |
420 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
421 | section_size_type view_size, | |
422 | unsigned char* reloc_view, | |
423 | section_size_type reloc_view_size); | |
6a74a719 | 424 | |
c51e6221 ILT |
425 | // Return a string used to fill a code section with nops. |
426 | std::string | |
8851ecca | 427 | do_code_fill(section_size_type length) const; |
c51e6221 | 428 | |
9a2d6984 ILT |
429 | // Return whether SYM is defined by the ABI. |
430 | bool | |
9c2d0ef9 | 431 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
432 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
433 | ||
bb04269c DK |
434 | // Return whether a symbol name implies a local label. The UnixWare |
435 | // 2.1 cc generates temporary symbols that start with .X, so we | |
436 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
437 | // If so, we should move the .X recognition into | |
438 | // Target::do_is_local_label_name. | |
439 | bool | |
440 | do_is_local_label_name(const char* name) const | |
441 | { | |
442 | if (name[0] == '.' && name[1] == 'X') | |
443 | return true; | |
444 | return Target::do_is_local_label_name(name); | |
445 | } | |
446 | ||
67181c72 ILT |
447 | // Return the PLT address to use for a global symbol. |
448 | uint64_t | |
449 | do_plt_address_for_global(const Symbol* gsym) const | |
450 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 451 | |
67181c72 ILT |
452 | uint64_t |
453 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
454 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 455 | |
b3ce541e ILT |
456 | // We can tell whether we take the address of a function. |
457 | inline bool | |
458 | do_can_check_for_function_pointers() const | |
459 | { return true; } | |
460 | ||
02d7cd44 ILT |
461 | // Return the base for a DW_EH_PE_datarel encoding. |
462 | uint64_t | |
463 | do_ehframe_datarel_base() const; | |
464 | ||
b6848d3c ILT |
465 | // Return whether SYM is call to a non-split function. |
466 | bool | |
467 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
468 | ||
9b547ce6 | 469 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
470 | void |
471 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
472 | section_offset_type fnoffset, section_size_type fnsize, | |
473 | unsigned char* view, section_size_type view_size, | |
474 | std::string* from, std::string* to) const; | |
475 | ||
96f2030e | 476 | // Return the size of the GOT section. |
fe8718a4 | 477 | section_size_type |
0e70b911 | 478 | got_size() const |
96f2030e ILT |
479 | { |
480 | gold_assert(this->got_ != NULL); | |
481 | return this->got_->data_size(); | |
482 | } | |
483 | ||
0e70b911 CC |
484 | // Return the number of entries in the GOT. |
485 | unsigned int | |
486 | got_entry_count() const | |
487 | { | |
488 | if (this->got_ == NULL) | |
489 | return 0; | |
490 | return this->got_size() / 4; | |
491 | } | |
492 | ||
493 | // Return the number of entries in the PLT. | |
494 | unsigned int | |
495 | plt_entry_count() const; | |
496 | ||
497 | // Return the offset of the first non-reserved PLT entry. | |
498 | unsigned int | |
499 | first_plt_entry_offset() const; | |
500 | ||
501 | // Return the size of each PLT entry. | |
502 | unsigned int | |
503 | plt_entry_size() const; | |
504 | ||
2e702c99 RM |
505 | protected: |
506 | // Instantiate the plt_ member. | |
507 | // This chooses the right PLT flavor for an executable or a shared object. | |
508 | Output_data_plt_i386* | |
509 | make_data_plt(Layout* layout, | |
510 | Output_data_space* got_plt, | |
511 | Output_data_space* got_irelative, | |
512 | bool dyn) | |
513 | { return this->do_make_data_plt(layout, got_plt, got_irelative, dyn); } | |
514 | ||
515 | virtual Output_data_plt_i386* | |
516 | do_make_data_plt(Layout* layout, | |
517 | Output_data_space* got_plt, | |
518 | Output_data_space* got_irelative, | |
519 | bool dyn) | |
520 | { | |
521 | if (dyn) | |
522 | return new Output_data_plt_i386_dyn(layout, got_plt, got_irelative); | |
523 | else | |
524 | return new Output_data_plt_i386_exec(layout, got_plt, got_irelative); | |
525 | } | |
526 | ||
92e059d8 ILT |
527 | private: |
528 | // The class which scans relocations. | |
529 | struct Scan | |
61ba1cf9 | 530 | { |
95a2c8d6 RS |
531 | static inline int |
532 | ||
533 | get_reference_flags(unsigned int r_type); | |
534 | ||
61ba1cf9 | 535 | inline void |
ad0f2072 | 536 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 537 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 538 | unsigned int data_shndx, |
07f397ab | 539 | Output_section* output_section, |
92e059d8 | 540 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
541 | const elfcpp::Sym<32, false>& lsym, |
542 | bool is_discarded); | |
61ba1cf9 | 543 | |
92e059d8 | 544 | inline void |
ad0f2072 | 545 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 546 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 547 | unsigned int data_shndx, |
07f397ab | 548 | Output_section* output_section, |
92e059d8 ILT |
549 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
550 | Symbol* gsym); | |
af6359d5 | 551 | |
21bb3914 | 552 | inline bool |
0897ed3b | 553 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
2e702c99 RM |
554 | Target_i386* target, |
555 | Sized_relobj_file<32, false>* object, | |
556 | unsigned int data_shndx, | |
557 | Output_section* output_section, | |
558 | const elfcpp::Rel<32, false>& reloc, | |
0897ed3b | 559 | unsigned int r_type, |
2e702c99 | 560 | const elfcpp::Sym<32, false>& lsym); |
0897ed3b ST |
561 | |
562 | inline bool | |
563 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
564 | Target_i386* target, | |
2e702c99 RM |
565 | Sized_relobj_file<32, false>* object, |
566 | unsigned int data_shndx, | |
567 | Output_section* output_section, | |
0897ed3b ST |
568 | const elfcpp::Rel<32, false>& reloc, |
569 | unsigned int r_type, | |
2e702c99 | 570 | Symbol* gsym); |
21bb3914 ST |
571 | |
572 | inline bool | |
0897ed3b | 573 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 574 | |
7223e9ca | 575 | bool |
6fa2a40b CC |
576 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
577 | unsigned int r_type); | |
7223e9ca | 578 | |
af6359d5 | 579 | static void |
6fa2a40b | 580 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
581 | |
582 | static void | |
6fa2a40b | 583 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 584 | Symbol*); |
61ba1cf9 ILT |
585 | }; |
586 | ||
92e059d8 ILT |
587 | // The class which implements relocation. |
588 | class Relocate | |
589 | { | |
590 | public: | |
ead1e424 | 591 | Relocate() |
46cf9fa2 | 592 | : skip_call_tls_get_addr_(false), |
82bb573a | 593 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
594 | { } |
595 | ||
596 | ~Relocate() | |
597 | { | |
598 | if (this->skip_call_tls_get_addr_) | |
599 | { | |
600 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 601 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
602 | } |
603 | } | |
604 | ||
86849f1f ILT |
605 | // Return whether the static relocation needs to be applied. |
606 | inline bool | |
607 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
608 | unsigned int r_type, |
609 | bool is_32bit, | |
031cdbed | 610 | Output_section* output_section); |
86849f1f | 611 | |
ead1e424 ILT |
612 | // Do a relocation. Return false if the caller should not issue |
613 | // any warnings about this relocation. | |
614 | inline bool | |
031cdbed ILT |
615 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
616 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 617 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 618 | const Symbol_value<32>*, |
92e059d8 | 619 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 620 | section_size_type); |
92e059d8 ILT |
621 | |
622 | private: | |
623 | // Do a TLS relocation. | |
ead1e424 | 624 | inline void |
07f397ab | 625 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
2e702c99 | 626 | size_t relnum, const elfcpp::Rel<32, false>&, |
c06b7b0b | 627 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 628 | const Symbol_value<32>*, |
fe8718a4 ILT |
629 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
630 | section_size_type); | |
92e059d8 | 631 | |
07f397ab ILT |
632 | // Do a TLS General-Dynamic to Initial-Exec transition. |
633 | inline void | |
634 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
635 | Output_segment* tls_segment, | |
636 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
637 | elfcpp::Elf_types<32>::Elf_Addr value, | |
638 | unsigned char* view, | |
fe8718a4 | 639 | section_size_type view_size); |
07f397ab | 640 | |
56622147 ILT |
641 | // Do a TLS General-Dynamic to Local-Exec transition. |
642 | inline void | |
643 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
644 | Output_segment* tls_segment, |
645 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
646 | elfcpp::Elf_types<32>::Elf_Addr value, | |
647 | unsigned char* view, | |
fe8718a4 | 648 | section_size_type view_size); |
92e059d8 | 649 | |
c2b45e22 CC |
650 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
651 | // transition. | |
652 | inline void | |
653 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
654 | Output_segment* tls_segment, | |
655 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
656 | elfcpp::Elf_types<32>::Elf_Addr value, | |
657 | unsigned char* view, | |
658 | section_size_type view_size); | |
659 | ||
660 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
661 | // transition. | |
662 | inline void | |
663 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
664 | Output_segment* tls_segment, | |
665 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
666 | elfcpp::Elf_types<32>::Elf_Addr value, | |
667 | unsigned char* view, | |
668 | section_size_type view_size); | |
669 | ||
56622147 | 670 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 671 | inline void |
56622147 | 672 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
673 | Output_segment* tls_segment, |
674 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
675 | elfcpp::Elf_types<32>::Elf_Addr value, | |
676 | unsigned char* view, | |
fe8718a4 | 677 | section_size_type view_size); |
ead1e424 | 678 | |
56622147 ILT |
679 | // Do a TLS Initial-Exec to Local-Exec transition. |
680 | static inline void | |
681 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
682 | Output_segment* tls_segment, |
683 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
684 | elfcpp::Elf_types<32>::Elf_Addr value, | |
685 | unsigned char* view, | |
fe8718a4 | 686 | section_size_type view_size); |
46cf9fa2 | 687 | |
46cf9fa2 ILT |
688 | // We need to keep track of which type of local dynamic relocation |
689 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
690 | enum Local_dynamic_type | |
691 | { | |
692 | LOCAL_DYNAMIC_NONE, | |
693 | LOCAL_DYNAMIC_SUN, | |
694 | LOCAL_DYNAMIC_GNU | |
695 | }; | |
696 | ||
ead1e424 ILT |
697 | // This is set if we should skip the next reloc, which should be a |
698 | // PLT32 reloc against ___tls_get_addr. | |
699 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
700 | // The type of local dynamic relocation we have seen in the section |
701 | // being relocated, if any. | |
702 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
703 | }; |
704 | ||
6a74a719 ILT |
705 | // A class which returns the size required for a relocation type, |
706 | // used while scanning relocs during a relocatable link. | |
707 | class Relocatable_size_for_reloc | |
708 | { | |
709 | public: | |
710 | unsigned int | |
711 | get_size_for_reloc(unsigned int, Relobj*); | |
712 | }; | |
713 | ||
92e059d8 ILT |
714 | // Adjust TLS relocation type based on the options and whether this |
715 | // is a local symbol. | |
af6359d5 | 716 | static tls::Tls_optimization |
7e1edb90 | 717 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 718 | |
ead1e424 | 719 | // Get the GOT section, creating it if necessary. |
dbe717ef | 720 | Output_data_got<32, false>* |
7e1edb90 | 721 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 722 | |
96f2030e ILT |
723 | // Get the GOT PLT section. |
724 | Output_data_space* | |
725 | got_plt_section() const | |
726 | { | |
727 | gold_assert(this->got_plt_ != NULL); | |
728 | return this->got_plt_; | |
729 | } | |
730 | ||
a8df5856 ILT |
731 | // Get the GOT section for TLSDESC entries. |
732 | Output_data_got<32, false>* | |
733 | got_tlsdesc_section() const | |
734 | { | |
735 | gold_assert(this->got_tlsdesc_ != NULL); | |
736 | return this->got_tlsdesc_; | |
737 | } | |
738 | ||
7223e9ca ILT |
739 | // Create the PLT section. |
740 | void | |
741 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
742 | ||
a3ad94ed ILT |
743 | // Create a PLT entry for a global symbol. |
744 | void | |
7e1edb90 | 745 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 746 | |
7223e9ca ILT |
747 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
748 | void | |
749 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 750 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
751 | unsigned int local_sym_index); |
752 | ||
9fa33bee | 753 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
754 | void |
755 | define_tls_base_symbol(Symbol_table*, Layout*); | |
756 | ||
94c4710f ILT |
757 | // Create a GOT entry for the TLS module index. |
758 | unsigned int | |
759 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 760 | Sized_relobj_file<32, false>* object); |
94c4710f | 761 | |
a3ad94ed | 762 | // Get the PLT section. |
e291e7b9 | 763 | Output_data_plt_i386* |
a3ad94ed ILT |
764 | plt_section() const |
765 | { | |
766 | gold_assert(this->plt_ != NULL); | |
767 | return this->plt_; | |
768 | } | |
769 | ||
5a6f7e2d ILT |
770 | // Get the dynamic reloc section, creating it if necessary. |
771 | Reloc_section* | |
772 | rel_dyn_section(Layout*); | |
773 | ||
e291e7b9 ILT |
774 | // Get the section to use for TLS_DESC relocations. |
775 | Reloc_section* | |
776 | rel_tls_desc_section(Layout*) const; | |
777 | ||
67181c72 ILT |
778 | // Get the section to use for IRELATIVE relocations. |
779 | Reloc_section* | |
780 | rel_irelative_section(Layout*); | |
781 | ||
12c0daef | 782 | // Add a potential copy relocation. |
a3ad94ed | 783 | void |
ef9beddf | 784 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 785 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
786 | unsigned int shndx, Output_section* output_section, |
787 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
788 | { | |
789 | this->copy_relocs_.copy_reloc(symtab, layout, | |
790 | symtab->get_sized_symbol<32>(sym), | |
791 | object, shndx, output_section, reloc, | |
792 | this->rel_dyn_section(layout)); | |
793 | } | |
ead1e424 | 794 | |
92e059d8 ILT |
795 | // Information about this specific target which we pass to the |
796 | // general Target structure. | |
75f65a3e | 797 | static const Target::Target_info i386_info; |
ead1e424 | 798 | |
0a65a3a7 | 799 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
800 | // These values are exposed to the ABI in an incremental link. |
801 | // Do not renumber existing values without changing the version | |
802 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
803 | enum Got_type |
804 | { | |
805 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
806 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
807 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
808 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
809 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
810 | }; |
811 | ||
ead1e424 | 812 | // The GOT section. |
dbe717ef | 813 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
814 | // The PLT section. |
815 | Output_data_plt_i386* plt_; | |
816 | // The GOT PLT section. | |
817 | Output_data_space* got_plt_; | |
67181c72 ILT |
818 | // The GOT section for IRELATIVE relocations. |
819 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
820 | // The GOT section for TLSDESC relocations. |
821 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
822 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
823 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
824 | // The dynamic reloc section. |
825 | Reloc_section* rel_dyn_; | |
67181c72 ILT |
826 | // The section to use for IRELATIVE relocs. |
827 | Reloc_section* rel_irelative_; | |
5a6f7e2d | 828 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 829 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
830 | // Space for variables copied with a COPY reloc. |
831 | Output_data_space* dynbss_; | |
c2b45e22 | 832 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 833 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
834 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
835 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
836 | }; |
837 | ||
838 | const Target::Target_info Target_i386::i386_info = | |
839 | { | |
61ba1cf9 ILT |
840 | 32, // size |
841 | false, // is_big_endian | |
842 | elfcpp::EM_386, // machine_code | |
843 | false, // has_make_symbol | |
dbe717ef | 844 | false, // has_resolve |
c51e6221 | 845 | true, // has_code_fill |
35cdfc9a | 846 | true, // is_default_stack_executable |
b3ce541e | 847 | true, // can_icf_inline_merge_sections |
0864d551 | 848 | '\0', // wrap_char |
dbe717ef | 849 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 850 | 0x08048000, // default_text_segment_address |
cd72c291 | 851 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 852 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
853 | false, // isolate_execinstr |
854 | 0, // rosegment_gap | |
8a5e3e08 ILT |
855 | elfcpp::SHN_UNDEF, // small_common_shndx |
856 | elfcpp::SHN_UNDEF, // large_common_shndx | |
857 | 0, // small_common_section_flags | |
05a352e6 DK |
858 | 0, // large_common_section_flags |
859 | NULL, // attributes_section | |
860 | NULL // attributes_vendor | |
14bfc3f5 ILT |
861 | }; |
862 | ||
ead1e424 ILT |
863 | // Get the GOT section, creating it if necessary. |
864 | ||
dbe717ef | 865 | Output_data_got<32, false>* |
7e1edb90 | 866 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
867 | { |
868 | if (this->got_ == NULL) | |
869 | { | |
7e1edb90 | 870 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 871 | |
7e1edb90 | 872 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 873 | |
9446efde ILT |
874 | // When using -z now, we can treat .got.plt as a relro section. |
875 | // Without -z now, it is modified after program startup by lazy | |
876 | // PLT relocations. | |
877 | bool is_got_plt_relro = parameters->options().now(); | |
878 | Output_section_order got_order = (is_got_plt_relro | |
879 | ? ORDER_RELRO | |
880 | : ORDER_RELRO_LAST); | |
881 | Output_section_order got_plt_order = (is_got_plt_relro | |
882 | ? ORDER_RELRO | |
883 | : ORDER_NON_RELRO_FIRST); | |
884 | ||
82742395 ILT |
885 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
886 | (elfcpp::SHF_ALLOC | |
887 | | elfcpp::SHF_WRITE), | |
9446efde | 888 | this->got_, got_order, true); |
ead1e424 | 889 | |
7d9e3d98 | 890 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
891 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
892 | (elfcpp::SHF_ALLOC | |
893 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
894 | this->got_plt_, got_plt_order, |
895 | is_got_plt_relro); | |
a3ad94ed | 896 | |
ead1e424 | 897 | // The first three entries are reserved. |
27bc2bce | 898 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 899 | |
9446efde ILT |
900 | if (!is_got_plt_relro) |
901 | { | |
902 | // Those bytes can go into the relro segment. | |
903 | layout->increase_relro(3 * 4); | |
904 | } | |
1a2dff53 | 905 | |
a3ad94ed | 906 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
907 | this->global_offset_table_ = |
908 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
909 | Symbol_table::PREDEFINED, | |
910 | this->got_plt_, | |
911 | 0, 0, elfcpp::STT_OBJECT, | |
912 | elfcpp::STB_LOCAL, | |
913 | elfcpp::STV_HIDDEN, 0, | |
914 | false, false); | |
a8df5856 | 915 | |
67181c72 ILT |
916 | // If there are any IRELATIVE relocations, they get GOT entries |
917 | // in .got.plt after the jump slot relocations. | |
918 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
919 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
920 | (elfcpp::SHF_ALLOC | |
921 | | elfcpp::SHF_WRITE), | |
922 | this->got_irelative_, | |
9446efde | 923 | got_plt_order, is_got_plt_relro); |
67181c72 | 924 | |
a8df5856 ILT |
925 | // If there are any TLSDESC relocations, they get GOT entries in |
926 | // .got.plt after the jump slot entries. | |
927 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
928 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
929 | (elfcpp::SHF_ALLOC | |
930 | | elfcpp::SHF_WRITE), | |
22f0da72 | 931 | this->got_tlsdesc_, |
9446efde | 932 | got_plt_order, is_got_plt_relro); |
ead1e424 | 933 | } |
a3ad94ed | 934 | |
ead1e424 ILT |
935 | return this->got_; |
936 | } | |
937 | ||
5a6f7e2d ILT |
938 | // Get the dynamic reloc section, creating it if necessary. |
939 | ||
940 | Target_i386::Reloc_section* | |
941 | Target_i386::rel_dyn_section(Layout* layout) | |
942 | { | |
943 | if (this->rel_dyn_ == NULL) | |
944 | { | |
945 | gold_assert(layout != NULL); | |
d98bc257 | 946 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 947 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
948 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
949 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
950 | } |
951 | return this->rel_dyn_; | |
952 | } | |
953 | ||
67181c72 ILT |
954 | // Get the section to use for IRELATIVE relocs, creating it if |
955 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
956 | // relocations. They need to follow the other dynamic relocations so | |
957 | // that they can refer to global variables initialized by those | |
958 | // relocs. | |
959 | ||
960 | Target_i386::Reloc_section* | |
961 | Target_i386::rel_irelative_section(Layout* layout) | |
962 | { | |
963 | if (this->rel_irelative_ == NULL) | |
964 | { | |
965 | // Make sure we have already create the dynamic reloc section. | |
966 | this->rel_dyn_section(layout); | |
967 | this->rel_irelative_ = new Reloc_section(false); | |
968 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
969 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
970 | ORDER_DYNAMIC_RELOCS, false); | |
971 | gold_assert(this->rel_dyn_->output_section() | |
972 | == this->rel_irelative_->output_section()); | |
973 | } | |
974 | return this->rel_irelative_; | |
975 | } | |
976 | ||
a3ad94ed ILT |
977 | // Create the PLT section. The ordinary .got section is an argument, |
978 | // since we need to refer to the start. We also create our own .got | |
979 | // section just for PLT entries. | |
980 | ||
67181c72 | 981 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
2e702c99 | 982 | uint64_t addralign, |
67181c72 ILT |
983 | Output_data_space* got_plt, |
984 | Output_data_space* got_irelative) | |
2e702c99 RM |
985 | : Output_section_data(addralign), |
986 | layout_(layout), tls_desc_rel_(NULL), | |
7d172687 ILT |
987 | irelative_rel_(NULL), got_plt_(got_plt), got_irelative_(got_irelative), |
988 | count_(0), irelative_count_(0), global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 989 | { |
d98bc257 | 990 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 991 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
992 | elfcpp::SHF_ALLOC, this->rel_, |
993 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
a3ad94ed ILT |
994 | } |
995 | ||
16649710 ILT |
996 | void |
997 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
998 | { | |
999 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
1000 | // linker, and so do we. | |
1001 | os->set_entsize(4); | |
1002 | } | |
1003 | ||
a3ad94ed ILT |
1004 | // Add an entry to the PLT. |
1005 | ||
1006 | void | |
67181c72 ILT |
1007 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
1008 | Symbol* gsym) | |
a3ad94ed ILT |
1009 | { |
1010 | gold_assert(!gsym->has_plt_offset()); | |
1011 | ||
a3ad94ed | 1012 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
1013 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1014 | && gsym->can_use_relative_reloc(false)) | |
1015 | { | |
2e702c99 | 1016 | gsym->set_plt_offset(this->irelative_count_ * this->get_plt_entry_size()); |
67181c72 ILT |
1017 | ++this->irelative_count_; |
1018 | section_offset_type got_offset = | |
1019 | this->got_irelative_->current_data_size(); | |
1020 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
1021 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
1022 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
1023 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1024 | struct Global_ifunc gi; |
1025 | gi.sym = gsym; | |
1026 | gi.got_offset = got_offset; | |
1027 | this->global_ifuncs_.push_back(gi); | |
1028 | } | |
1029 | else | |
1030 | { | |
67181c72 ILT |
1031 | // When setting the PLT offset we skip the initial reserved PLT |
1032 | // entry. | |
2e702c99 | 1033 | gsym->set_plt_offset((this->count_ + 1) * this->get_plt_entry_size()); |
67181c72 ILT |
1034 | |
1035 | ++this->count_; | |
1036 | ||
1037 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
1038 | ||
1039 | // Every PLT entry needs a GOT entry which points back to the | |
1040 | // PLT entry (this will be changed by the dynamic linker, | |
1041 | // normally lazily when the function is called). | |
1042 | this->got_plt_->set_current_data_size(got_offset + 4); | |
1043 | ||
7223e9ca ILT |
1044 | gsym->set_needs_dynsym_entry(); |
1045 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
1046 | got_offset); | |
1047 | } | |
a3ad94ed ILT |
1048 | |
1049 | // Note that we don't need to save the symbol. The contents of the | |
1050 | // PLT are independent of which symbols are used. The symbols only | |
1051 | // appear in the relocations. | |
1052 | } | |
1053 | ||
7223e9ca ILT |
1054 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1055 | // the PLT offset. | |
1056 | ||
1057 | unsigned int | |
6fa2a40b | 1058 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
1059 | Symbol_table* symtab, |
1060 | Layout* layout, | |
6fa2a40b CC |
1061 | Sized_relobj_file<32, false>* relobj, |
1062 | unsigned int local_sym_index) | |
7223e9ca | 1063 | { |
2e702c99 | 1064 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1065 | ++this->irelative_count_; |
7223e9ca | 1066 | |
67181c72 | 1067 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1068 | |
1069 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1070 | // entry. | |
67181c72 | 1071 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
1072 | |
1073 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1074 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
1075 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
1076 | elfcpp::R_386_IRELATIVE, | |
1077 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
1078 | |
1079 | struct Local_ifunc li; | |
1080 | li.object = relobj; | |
1081 | li.local_sym_index = local_sym_index; | |
1082 | li.got_offset = got_offset; | |
1083 | this->local_ifuncs_.push_back(li); | |
1084 | ||
1085 | return plt_offset; | |
1086 | } | |
1087 | ||
e291e7b9 ILT |
1088 | // Return where the TLS_DESC relocations should go, creating it if |
1089 | // necessary. These follow the JUMP_SLOT relocations. | |
1090 | ||
1091 | Output_data_plt_i386::Reloc_section* | |
1092 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
1093 | { | |
1094 | if (this->tls_desc_rel_ == NULL) | |
1095 | { | |
1096 | this->tls_desc_rel_ = new Reloc_section(false); | |
1097 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1098 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 1099 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1100 | gold_assert(this->tls_desc_rel_->output_section() |
1101 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1102 | } |
1103 | return this->tls_desc_rel_; | |
1104 | } | |
1105 | ||
67181c72 ILT |
1106 | // Return where the IRELATIVE relocations should go in the PLT. These |
1107 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
1108 | ||
1109 | Output_data_plt_i386::Reloc_section* | |
1110 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
1111 | { | |
1112 | if (this->irelative_rel_ == NULL) | |
1113 | { | |
1114 | // Make sure we have a place for the TLS_DESC relocations, in | |
1115 | // case we see any later on. | |
1116 | this->rel_tls_desc(layout); | |
1117 | this->irelative_rel_ = new Reloc_section(false); | |
1118 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
1119 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1120 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1121 | gold_assert(this->irelative_rel_->output_section() | |
1122 | == this->rel_->output_section()); | |
1123 | ||
1124 | if (parameters->doing_static_link()) | |
1125 | { | |
1126 | // A statically linked executable will only have a .rel.plt | |
1127 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
1128 | // symbols. The library will use these symbols to locate | |
1129 | // the IRELATIVE relocs at program startup time. | |
1130 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
1131 | Symbol_table::PREDEFINED, | |
1132 | this->irelative_rel_, 0, 0, | |
1133 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1134 | elfcpp::STV_HIDDEN, 0, false, true); | |
1135 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
1136 | Symbol_table::PREDEFINED, | |
1137 | this->irelative_rel_, 0, 0, | |
1138 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1139 | elfcpp::STV_HIDDEN, 0, true, true); | |
1140 | } | |
1141 | } | |
1142 | return this->irelative_rel_; | |
1143 | } | |
1144 | ||
1145 | // Return the PLT address to use for a global symbol. | |
1146 | ||
1147 | uint64_t | |
1148 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
1149 | { | |
1150 | uint64_t offset = 0; | |
1151 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1152 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1153 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
67181c72 ILT |
1154 | return this->address() + offset; |
1155 | } | |
1156 | ||
1157 | // Return the PLT address to use for a local symbol. These are always | |
1158 | // IRELATIVE relocs. | |
1159 | ||
1160 | uint64_t | |
1161 | Output_data_plt_i386::address_for_local(const Relobj*, unsigned int) | |
1162 | { | |
2e702c99 | 1163 | return this->address() + (this->count_ + 1) * this->get_plt_entry_size(); |
67181c72 ILT |
1164 | } |
1165 | ||
a3ad94ed ILT |
1166 | // The first entry in the PLT for an executable. |
1167 | ||
2e702c99 | 1168 | const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1169 | { |
1170 | 0xff, 0x35, // pushl contents of memory address | |
1171 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1172 | 0xff, 0x25, // jmp indirect | |
1173 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1174 | 0, 0, 0, 0 // unused | |
1175 | }; | |
1176 | ||
2e702c99 RM |
1177 | void |
1178 | Output_data_plt_i386_exec::do_fill_first_plt_entry( | |
1179 | unsigned char* pov, | |
1180 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
1181 | { | |
1182 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1183 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1184 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1185 | } | |
1186 | ||
a3ad94ed ILT |
1187 | // The first entry in the PLT for a shared object. |
1188 | ||
2e702c99 | 1189 | const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1190 | { |
1191 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1192 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1193 | 0, 0, 0, 0 // unused | |
1194 | }; | |
1195 | ||
2e702c99 RM |
1196 | void |
1197 | Output_data_plt_i386_dyn::do_fill_first_plt_entry( | |
1198 | unsigned char* pov, | |
1199 | elfcpp::Elf_types<32>::Elf_Addr) | |
1200 | { | |
1201 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1202 | } | |
1203 | ||
a3ad94ed ILT |
1204 | // Subsequent entries in the PLT for an executable. |
1205 | ||
2e702c99 | 1206 | const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1207 | { |
1208 | 0xff, 0x25, // jmp indirect | |
1209 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1210 | 0x68, // pushl immediate | |
1211 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1212 | 0xe9, // jmp relative | |
1213 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1214 | }; | |
1215 | ||
2e702c99 RM |
1216 | unsigned int |
1217 | Output_data_plt_i386_exec::do_fill_plt_entry( | |
1218 | unsigned char* pov, | |
1219 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
1220 | unsigned int got_offset, | |
1221 | unsigned int plt_offset, | |
1222 | unsigned int plt_rel_offset) | |
1223 | { | |
1224 | memcpy(pov, plt_entry, plt_entry_size); | |
1225 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1226 | got_address + got_offset); | |
1227 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1228 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1229 | return 6; | |
1230 | } | |
1231 | ||
a3ad94ed ILT |
1232 | // Subsequent entries in the PLT for a shared object. |
1233 | ||
2e702c99 | 1234 | const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1235 | { |
1236 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1237 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1238 | 0x68, // pushl immediate | |
1239 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1240 | 0xe9, // jmp relative | |
1241 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1242 | }; | |
1243 | ||
2e702c99 RM |
1244 | unsigned int |
1245 | Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov, | |
1246 | elfcpp::Elf_types<32>::Elf_Addr, | |
1247 | unsigned int got_offset, | |
1248 | unsigned int plt_offset, | |
1249 | unsigned int plt_rel_offset) | |
1250 | { | |
1251 | memcpy(pov, plt_entry, plt_entry_size); | |
1252 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1253 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1254 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1255 | return 6; | |
1256 | } | |
1257 | ||
07a60597 ILT |
1258 | // The .eh_frame unwind information for the PLT. |
1259 | ||
1260 | const unsigned char | |
1261 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1262 | { | |
1263 | 1, // CIE version. | |
1264 | 'z', // Augmentation: augmentation size included. | |
1265 | 'R', // Augmentation: FDE encoding included. | |
1266 | '\0', // End of augmentation string. | |
1267 | 1, // Code alignment factor. | |
1268 | 0x7c, // Data alignment factor. | |
1269 | 8, // Return address column. | |
1270 | 1, // Augmentation size. | |
1271 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1272 | | elfcpp::DW_EH_PE_sdata4), | |
1273 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1274 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1275 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1276 | elfcpp::DW_CFA_nop | |
1277 | }; | |
1278 | ||
1279 | const unsigned char | |
2e702c99 | 1280 | Output_data_plt_i386_standard::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1281 | { |
1282 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1283 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1284 | 0, // Augmentation size. | |
1285 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1286 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1287 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1288 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1289 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1290 | 11, // Block length. | |
1291 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1292 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1293 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1294 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1295 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1296 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1297 | elfcpp::DW_OP_lit2, // Push 2. | |
1298 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1299 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1300 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1301 | elfcpp::DW_CFA_nop, | |
1302 | elfcpp::DW_CFA_nop, | |
1303 | elfcpp::DW_CFA_nop | |
1304 | }; | |
1305 | ||
a3ad94ed ILT |
1306 | // Write out the PLT. This uses the hand-coded instructions above, |
1307 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1308 | // Processor Supplement. | |
1309 | ||
1310 | void | |
1311 | Output_data_plt_i386::do_write(Output_file* of) | |
1312 | { | |
2ea97941 | 1313 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1314 | const section_size_type oview_size = |
1315 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1316 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1317 | |
1318 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1319 | gold_assert(parameters->incremental_update() |
1320 | || (got_file_offset + this->got_plt_->data_size() | |
1321 | == this->got_irelative_->offset())); | |
fe8718a4 | 1322 | const section_size_type got_size = |
67181c72 ILT |
1323 | convert_to_section_size_type(this->got_plt_->data_size() |
1324 | + this->got_irelative_->data_size()); | |
a3ad94ed ILT |
1325 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1326 | got_size); | |
1327 | ||
1328 | unsigned char* pov = oview; | |
1329 | ||
1330 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1331 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1332 | ||
2e702c99 RM |
1333 | this->fill_first_plt_entry(pov, got_address); |
1334 | pov += this->get_plt_entry_size(); | |
a3ad94ed ILT |
1335 | |
1336 | unsigned char* got_pov = got_view; | |
1337 | ||
7d172687 ILT |
1338 | // The first entry in the GOT is the address of the .dynamic section |
1339 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1340 | // We saved space for them when we created the section in | |
1341 | // Target_i386::got_section. | |
1342 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1343 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1344 | elfcpp::Swap<32, false>::writeval(got_pov, dynamic_addr); | |
1345 | got_pov += 4; | |
1346 | memset(got_pov, 0, 8); | |
1347 | got_pov += 8; | |
a3ad94ed ILT |
1348 | |
1349 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1350 | ||
2e702c99 | 1351 | unsigned int plt_offset = this->get_plt_entry_size(); |
a3ad94ed ILT |
1352 | unsigned int plt_rel_offset = 0; |
1353 | unsigned int got_offset = 12; | |
67181c72 | 1354 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1355 | for (unsigned int i = 0; |
1356 | i < count; | |
1357 | ++i, | |
2e702c99 | 1358 | pov += this->get_plt_entry_size(), |
a3ad94ed | 1359 | got_pov += 4, |
2e702c99 | 1360 | plt_offset += this->get_plt_entry_size(), |
a3ad94ed ILT |
1361 | plt_rel_offset += rel_size, |
1362 | got_offset += 4) | |
1363 | { | |
1364 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1365 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1366 | got_address, | |
1367 | got_offset, | |
1368 | plt_offset, | |
1369 | plt_rel_offset); | |
a3ad94ed ILT |
1370 | |
1371 | // Set the entry in the GOT. | |
2e702c99 RM |
1372 | elfcpp::Swap<32, false>::writeval(got_pov, |
1373 | plt_address + plt_offset + lazy_offset); | |
a3ad94ed ILT |
1374 | } |
1375 | ||
7223e9ca ILT |
1376 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1377 | // the GOT to point to the actual symbol value, rather than point to | |
1378 | // the PLT entry. That will let the dynamic linker call the right | |
1379 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1380 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1381 | for (std::vector<Global_ifunc>::const_iterator p = |
1382 | this->global_ifuncs_.begin(); | |
1383 | p != this->global_ifuncs_.end(); | |
1384 | ++p) | |
1385 | { | |
1386 | const Sized_symbol<32>* ssym = | |
1387 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1388 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1389 | ssym->value()); |
1390 | } | |
1391 | ||
1392 | for (std::vector<Local_ifunc>::const_iterator p = | |
1393 | this->local_ifuncs_.begin(); | |
1394 | p != this->local_ifuncs_.end(); | |
1395 | ++p) | |
1396 | { | |
1397 | const Symbol_value<32>* psymval = | |
1398 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1399 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1400 | psymval->value(p->object, 0)); |
1401 | } | |
1402 | ||
fe8718a4 ILT |
1403 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1404 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1405 | |
2ea97941 | 1406 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1407 | of->write_output_view(got_file_offset, got_size, got_view); |
1408 | } | |
1409 | ||
7223e9ca | 1410 | // Create the PLT section. |
a3ad94ed ILT |
1411 | |
1412 | void | |
7223e9ca | 1413 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1414 | { |
a3ad94ed ILT |
1415 | if (this->plt_ == NULL) |
1416 | { | |
1417 | // Create the GOT sections first. | |
7e1edb90 | 1418 | this->got_section(symtab, layout); |
a3ad94ed | 1419 | |
2e702c99 RM |
1420 | const bool dyn = parameters->options().output_is_position_independent(); |
1421 | this->plt_ = this->make_data_plt(layout, | |
1422 | this->got_plt_, | |
1423 | this->got_irelative_, | |
1424 | dyn); | |
1425 | ||
1426 | // Add unwind information if requested. | |
1427 | if (parameters->options().ld_generated_unwind_info()) | |
1428 | this->plt_->add_eh_frame(layout); | |
1429 | ||
16649710 ILT |
1430 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1431 | (elfcpp::SHF_ALLOC | |
1432 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1433 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1434 | |
1435 | // Make the sh_info field of .rel.plt point to .plt. | |
1436 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1437 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1438 | } |
7223e9ca | 1439 | } |
a3ad94ed | 1440 | |
7223e9ca ILT |
1441 | // Create a PLT entry for a global symbol. |
1442 | ||
1443 | void | |
1444 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1445 | { | |
1446 | if (gsym->has_plt_offset()) | |
1447 | return; | |
1448 | if (this->plt_ == NULL) | |
1449 | this->make_plt_section(symtab, layout); | |
67181c72 | 1450 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1451 | } |
1452 | ||
7223e9ca ILT |
1453 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1454 | ||
1455 | void | |
1456 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1457 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1458 | unsigned int local_sym_index) |
1459 | { | |
1460 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1461 | return; | |
1462 | if (this->plt_ == NULL) | |
1463 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1464 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1465 | relobj, | |
7223e9ca ILT |
1466 | local_sym_index); |
1467 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1468 | } | |
1469 | ||
0e70b911 CC |
1470 | // Return the number of entries in the PLT. |
1471 | ||
1472 | unsigned int | |
1473 | Target_i386::plt_entry_count() const | |
1474 | { | |
1475 | if (this->plt_ == NULL) | |
1476 | return 0; | |
1477 | return this->plt_->entry_count(); | |
1478 | } | |
1479 | ||
1480 | // Return the offset of the first non-reserved PLT entry. | |
1481 | ||
1482 | unsigned int | |
1483 | Target_i386::first_plt_entry_offset() const | |
1484 | { | |
2e702c99 | 1485 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1486 | } |
1487 | ||
1488 | // Return the size of each PLT entry. | |
1489 | ||
1490 | unsigned int | |
1491 | Target_i386::plt_entry_size() const | |
1492 | { | |
2e702c99 | 1493 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1494 | } |
1495 | ||
e291e7b9 ILT |
1496 | // Get the section to use for TLS_DESC relocations. |
1497 | ||
1498 | Target_i386::Reloc_section* | |
1499 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1500 | { | |
1501 | return this->plt_section()->rel_tls_desc(layout); | |
1502 | } | |
1503 | ||
9fa33bee | 1504 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1505 | |
1506 | void | |
1507 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1508 | { | |
1509 | if (this->tls_base_symbol_defined_) | |
1510 | return; | |
1511 | ||
1512 | Output_segment* tls_segment = layout->tls_segment(); | |
1513 | if (tls_segment != NULL) | |
1514 | { | |
183fd0e3 | 1515 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1516 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1517 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1518 | tls_segment, 0, 0, |
1519 | elfcpp::STT_TLS, | |
1520 | elfcpp::STB_LOCAL, | |
1521 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1522 | (is_exec |
1523 | ? Symbol::SEGMENT_END | |
1524 | : Symbol::SEGMENT_START), | |
1525 | true); | |
edfbb029 CC |
1526 | } |
1527 | this->tls_base_symbol_defined_ = true; | |
1528 | } | |
1529 | ||
94c4710f ILT |
1530 | // Create a GOT entry for the TLS module index. |
1531 | ||
1532 | unsigned int | |
1533 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2e702c99 | 1534 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1535 | { |
1536 | if (this->got_mod_index_offset_ == -1U) | |
1537 | { | |
1538 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1539 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1540 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1541 | unsigned int got_offset = got->add_constant(0); | |
1542 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
2e702c99 | 1543 | got_offset); |
009a67a2 | 1544 | got->add_constant(0); |
94c4710f ILT |
1545 | this->got_mod_index_offset_ = got_offset; |
1546 | } | |
1547 | return this->got_mod_index_offset_; | |
1548 | } | |
1549 | ||
92e059d8 | 1550 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1551 | // symbol. IS_FINAL is true if the final address of this symbol is |
1552 | // known at link time. | |
92e059d8 | 1553 | |
af6359d5 | 1554 | tls::Tls_optimization |
7e1edb90 | 1555 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1556 | { |
1557 | // If we are generating a shared library, then we can't do anything | |
1558 | // in the linker. | |
8851ecca | 1559 | if (parameters->options().shared()) |
af6359d5 | 1560 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1561 | |
1562 | switch (r_type) | |
1563 | { | |
1564 | case elfcpp::R_386_TLS_GD: | |
1565 | case elfcpp::R_386_TLS_GOTDESC: | |
1566 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1567 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1568 | // access. Since we know that we are generating an executable, |
1569 | // we can convert this to Initial-Exec. If we also know that | |
1570 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1571 | if (is_final) |
af6359d5 ILT |
1572 | return tls::TLSOPT_TO_LE; |
1573 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1574 | |
1575 | case elfcpp::R_386_TLS_LDM: | |
1576 | // This is Local-Dynamic, which refers to a local symbol in the | |
1577 | // dynamic TLS block. Since we know that we generating an | |
1578 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1579 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1580 | |
1581 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1582 | // Another type of Local-Dynamic relocation. |
1583 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1584 | |
1585 | case elfcpp::R_386_TLS_IE: | |
1586 | case elfcpp::R_386_TLS_GOTIE: | |
1587 | case elfcpp::R_386_TLS_IE_32: | |
1588 | // These are Initial-Exec relocs which get the thread offset | |
1589 | // from the GOT. If we know that we are linking against the | |
1590 | // local symbol, we can switch to Local-Exec, which links the | |
1591 | // thread offset into the instruction. | |
a3ad94ed | 1592 | if (is_final) |
af6359d5 ILT |
1593 | return tls::TLSOPT_TO_LE; |
1594 | return tls::TLSOPT_NONE; | |
8462ae85 | 1595 | |
92e059d8 ILT |
1596 | case elfcpp::R_386_TLS_LE: |
1597 | case elfcpp::R_386_TLS_LE_32: | |
1598 | // When we already have Local-Exec, there is nothing further we | |
1599 | // can do. | |
af6359d5 | 1600 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1601 | |
1602 | default: | |
a3ad94ed | 1603 | gold_unreachable(); |
92e059d8 ILT |
1604 | } |
1605 | } | |
1606 | ||
95a2c8d6 | 1607 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1608 | |
95a2c8d6 RS |
1609 | int |
1610 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1611 | { |
1612 | switch (r_type) | |
1613 | { | |
1614 | case elfcpp::R_386_NONE: | |
1615 | case elfcpp::R_386_GNU_VTINHERIT: | |
1616 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1617 | case elfcpp::R_386_GOTPC: |
1618 | // No symbol reference. | |
1619 | return 0; | |
7223e9ca ILT |
1620 | |
1621 | case elfcpp::R_386_32: | |
1622 | case elfcpp::R_386_16: | |
1623 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1624 | return Symbol::ABSOLUTE_REF; |
1625 | ||
7223e9ca ILT |
1626 | case elfcpp::R_386_PC32: |
1627 | case elfcpp::R_386_PC16: | |
1628 | case elfcpp::R_386_PC8: | |
7223e9ca | 1629 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1630 | return Symbol::RELATIVE_REF; |
1631 | ||
1632 | case elfcpp::R_386_PLT32: | |
1633 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1634 | ||
7223e9ca | 1635 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1636 | // Absolute in GOT. |
1637 | return Symbol::ABSOLUTE_REF; | |
1638 | ||
1639 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1640 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1641 | case elfcpp::R_386_TLS_DESC_CALL: | |
1642 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1643 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1644 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1645 | case elfcpp::R_386_TLS_IE_32: | |
1646 | case elfcpp::R_386_TLS_GOTIE: | |
1647 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1648 | case elfcpp::R_386_TLS_LE_32: | |
1649 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1650 | |
1651 | case elfcpp::R_386_COPY: | |
1652 | case elfcpp::R_386_GLOB_DAT: | |
1653 | case elfcpp::R_386_JUMP_SLOT: | |
1654 | case elfcpp::R_386_RELATIVE: | |
1655 | case elfcpp::R_386_IRELATIVE: | |
1656 | case elfcpp::R_386_TLS_TPOFF: | |
1657 | case elfcpp::R_386_TLS_DTPMOD32: | |
1658 | case elfcpp::R_386_TLS_DTPOFF32: | |
1659 | case elfcpp::R_386_TLS_TPOFF32: | |
1660 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1661 | case elfcpp::R_386_32PLT: |
1662 | case elfcpp::R_386_TLS_GD_32: | |
1663 | case elfcpp::R_386_TLS_GD_PUSH: | |
1664 | case elfcpp::R_386_TLS_GD_CALL: | |
1665 | case elfcpp::R_386_TLS_GD_POP: | |
1666 | case elfcpp::R_386_TLS_LDM_32: | |
1667 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1668 | case elfcpp::R_386_TLS_LDM_CALL: | |
1669 | case elfcpp::R_386_TLS_LDM_POP: | |
1670 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1671 | default: | |
95a2c8d6 RS |
1672 | // Not expected. We will give an error later. |
1673 | return 0; | |
7223e9ca ILT |
1674 | } |
1675 | } | |
1676 | ||
95a2c8d6 RS |
1677 | // Report an unsupported relocation against a local symbol. |
1678 | ||
1679 | void | |
6fa2a40b | 1680 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1681 | unsigned int r_type) |
1682 | { | |
1683 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1684 | object->name().c_str(), r_type); | |
1685 | } | |
1686 | ||
1687 | // Return whether we need to make a PLT entry for a relocation of a | |
1688 | // given type against a STT_GNU_IFUNC symbol. | |
1689 | ||
1690 | bool | |
6fa2a40b CC |
1691 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1692 | Sized_relobj_file<32, false>* object, | |
1693 | unsigned int r_type) | |
95a2c8d6 RS |
1694 | { |
1695 | int flags = Scan::get_reference_flags(r_type); | |
1696 | if (flags & Symbol::TLS_REF) | |
1697 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 1698 | object->name().c_str(), r_type); |
95a2c8d6 RS |
1699 | return flags != 0; |
1700 | } | |
1701 | ||
92e059d8 ILT |
1702 | // Scan a relocation for a local symbol. |
1703 | ||
1704 | inline void | |
ad0f2072 | 1705 | Target_i386::Scan::local(Symbol_table* symtab, |
bfdfa4cd AM |
1706 | Layout* layout, |
1707 | Target_i386* target, | |
1708 | Sized_relobj_file<32, false>* object, | |
1709 | unsigned int data_shndx, | |
1710 | Output_section* output_section, | |
1711 | const elfcpp::Rel<32, false>& reloc, | |
1712 | unsigned int r_type, | |
1713 | const elfcpp::Sym<32, false>& lsym, | |
1714 | bool is_discarded) | |
92e059d8 | 1715 | { |
bfdfa4cd AM |
1716 | if (is_discarded) |
1717 | return; | |
1718 | ||
7223e9ca ILT |
1719 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1720 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1721 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1722 | { | |
1723 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1724 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1725 | } | |
1726 | ||
92e059d8 ILT |
1727 | switch (r_type) |
1728 | { | |
1729 | case elfcpp::R_386_NONE: | |
1730 | case elfcpp::R_386_GNU_VTINHERIT: | |
1731 | case elfcpp::R_386_GNU_VTENTRY: | |
1732 | break; | |
1733 | ||
1734 | case elfcpp::R_386_32: | |
436ca963 ILT |
1735 | // If building a shared library (or a position-independent |
1736 | // executable), we need to create a dynamic relocation for | |
1737 | // this location. The relocation applied at link time will | |
1738 | // apply the link-time value, so we flag the location with | |
1739 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1740 | // relocate it easily. | |
8851ecca | 1741 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1742 | { |
1743 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1744 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1745 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1746 | output_section, data_shndx, | |
1747 | reloc.get_r_offset()); | |
2e702c99 | 1748 | } |
d61c6bd4 ILT |
1749 | break; |
1750 | ||
1751 | case elfcpp::R_386_16: | |
1752 | case elfcpp::R_386_8: | |
1753 | // If building a shared library (or a position-independent | |
1754 | // executable), we need to create a dynamic relocation for | |
1755 | // this location. Because the addend needs to remain in the | |
1756 | // data section, we need to be careful not to apply this | |
1757 | // relocation statically. | |
8851ecca | 1758 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1759 | { |
1760 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1761 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
2e702c99 | 1762 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1763 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1764 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1765 | else |
1766 | { | |
1767 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1768 | unsigned int shndx = lsym.get_st_shndx(); |
1769 | bool is_ordinary; | |
1770 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1771 | &is_ordinary); | |
1772 | if (!is_ordinary) | |
1773 | object->error(_("section symbol %u has bad shndx %u"), | |
1774 | r_sym, shndx); | |
1775 | else | |
1776 | rel_dyn->add_local_section(object, shndx, | |
1777 | r_type, output_section, | |
1778 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1779 | } |
1780 | } | |
92e059d8 ILT |
1781 | break; |
1782 | ||
1783 | case elfcpp::R_386_PC32: | |
1784 | case elfcpp::R_386_PC16: | |
1785 | case elfcpp::R_386_PC8: | |
1786 | break; | |
1787 | ||
df2efe71 ILT |
1788 | case elfcpp::R_386_PLT32: |
1789 | // Since we know this is a local symbol, we can handle this as a | |
1790 | // PC32 reloc. | |
1791 | break; | |
1792 | ||
ead1e424 ILT |
1793 | case elfcpp::R_386_GOTOFF: |
1794 | case elfcpp::R_386_GOTPC: | |
1795 | // We need a GOT section. | |
7e1edb90 | 1796 | target->got_section(symtab, layout); |
ead1e424 ILT |
1797 | break; |
1798 | ||
1b64748b ILT |
1799 | case elfcpp::R_386_GOT32: |
1800 | { | |
2e702c99 RM |
1801 | // The symbol requires a GOT entry. |
1802 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1803 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1804 | |
1805 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1806 | // lets function pointers compare correctly with shared | |
1807 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1808 | bool is_new; | |
1809 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1810 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1811 | else | |
1812 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
1813 | if (is_new) |
1814 | { | |
1815 | // If we are generating a shared object, we need to add a | |
1816 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
1817 | if (parameters->options().output_is_position_independent()) | |
1818 | { | |
1819 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1820 | unsigned int got_offset = |
1821 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1822 | rel_dyn->add_local_relative(object, r_sym, | |
1823 | elfcpp::R_386_RELATIVE, | |
1824 | got, got_offset); | |
2e702c99 RM |
1825 | } |
1826 | } | |
1b64748b ILT |
1827 | } |
1828 | break; | |
1829 | ||
af6359d5 ILT |
1830 | // These are relocations which should only be seen by the |
1831 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1832 | case elfcpp::R_386_COPY: |
1833 | case elfcpp::R_386_GLOB_DAT: | |
1834 | case elfcpp::R_386_JUMP_SLOT: | |
1835 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1836 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1837 | case elfcpp::R_386_TLS_TPOFF: |
1838 | case elfcpp::R_386_TLS_DTPMOD32: | |
1839 | case elfcpp::R_386_TLS_DTPOFF32: | |
1840 | case elfcpp::R_386_TLS_TPOFF32: | |
1841 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1842 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1843 | object->name().c_str(), r_type); |
92e059d8 ILT |
1844 | break; |
1845 | ||
af6359d5 | 1846 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1847 | // linking. |
56622147 ILT |
1848 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1849 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1850 | case elfcpp::R_386_TLS_DESC_CALL: | |
1851 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1852 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1853 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1854 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1855 | case elfcpp::R_386_TLS_GOTIE: |
1856 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1857 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1858 | { |
8851ecca | 1859 | bool output_is_shared = parameters->options().shared(); |
af6359d5 | 1860 | const tls::Tls_optimization optimized_type |
2e702c99 | 1861 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); |
7e1edb90 ILT |
1862 | switch (r_type) |
1863 | { | |
56622147 | 1864 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1865 | if (optimized_type == tls::TLSOPT_NONE) |
1866 | { | |
2e702c99 RM |
1867 | // Create a pair of GOT entries for the module index and |
1868 | // dtv-relative offset. | |
1869 | Output_data_got<32, false>* got | |
1870 | = target->got_section(symtab, layout); | |
1871 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1872 | unsigned int shndx = lsym.get_st_shndx(); |
1873 | bool is_ordinary; | |
1874 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1875 | if (!is_ordinary) | |
1876 | object->error(_("local symbol %u has bad shndx %u"), | |
1877 | r_sym, shndx); | |
2e702c99 | 1878 | else |
d491d34e ILT |
1879 | got->add_local_pair_with_rel(object, r_sym, shndx, |
1880 | GOT_TYPE_TLS_PAIR, | |
1881 | target->rel_dyn_section(layout), | |
bd73a62d | 1882 | elfcpp::R_386_TLS_DTPMOD32); |
07f397ab ILT |
1883 | } |
1884 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1885 | unsupported_reloc_local(object, r_type); | |
1886 | break; | |
1887 | ||
56622147 | 1888 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1889 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
1890 | if (optimized_type == tls::TLSOPT_NONE) |
1891 | { | |
1892 | // Create a double GOT entry with an R_386_TLS_DESC | |
1893 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1894 | // lazily, so the GOT entry needs to be in an area in | |
1895 | // .got.plt, not .got. Call got_section to make sure | |
1896 | // the section has been created. | |
a8df5856 | 1897 | target->got_section(symtab, layout); |
2e702c99 RM |
1898 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
1899 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
1900 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1901 | { | |
1902 | unsigned int got_offset = got->add_constant(0); | |
1903 | // The local symbol value is stored in the second | |
1904 | // GOT entry. | |
1905 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1906 | // That set the GOT offset of the local symbol to | |
1907 | // point to the second entry, but we want it to | |
1908 | // point to the first. | |
1909 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1910 | got_offset); | |
1911 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1912 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1913 | } | |
2e702c99 RM |
1914 | } |
1915 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1916 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1917 | break; |
1918 | ||
c2b45e22 CC |
1919 | case elfcpp::R_386_TLS_DESC_CALL: |
1920 | break; | |
1921 | ||
56622147 | 1922 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1923 | if (optimized_type == tls::TLSOPT_NONE) |
1924 | { | |
2e702c99 RM |
1925 | // Create a GOT entry for the module index. |
1926 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
1927 | } |
1928 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1929 | unsupported_reloc_local(object, r_type); |
1930 | break; | |
1931 | ||
56622147 | 1932 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1933 | break; |
1934 | ||
56622147 ILT |
1935 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1936 | case elfcpp::R_386_TLS_IE_32: | |
1937 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1938 | layout->set_has_static_tls(); |
07f397ab ILT |
1939 | if (optimized_type == tls::TLSOPT_NONE) |
1940 | { | |
2e702c99 RM |
1941 | // For the R_386_TLS_IE relocation, we need to create a |
1942 | // dynamic relocation when building a shared library. | |
1943 | if (r_type == elfcpp::R_386_TLS_IE | |
1944 | && parameters->options().shared()) | |
1945 | { | |
1946 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1947 | unsigned int r_sym | |
1948 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1949 | rel_dyn->add_local_relative(object, r_sym, | |
1950 | elfcpp::R_386_RELATIVE, | |
1951 | output_section, data_shndx, | |
1952 | reloc.get_r_offset()); | |
1953 | } | |
1954 | // Create a GOT entry for the tp-relative offset. | |
1955 | Output_data_got<32, false>* got | |
1956 | = target->got_section(symtab, layout); | |
1957 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1958 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1959 | ? elfcpp::R_386_TLS_TPOFF32 | |
1960 | : elfcpp::R_386_TLS_TPOFF); | |
1961 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1962 | ? GOT_TYPE_TLS_OFFSET | |
1963 | : GOT_TYPE_TLS_NOFFSET); | |
1964 | got->add_local_with_rel(object, r_sym, got_type, | |
1965 | target->rel_dyn_section(layout), | |
1966 | dyn_r_type); | |
07f397ab ILT |
1967 | } |
1968 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1969 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1970 | break; |
af6359d5 | 1971 | |
56622147 ILT |
1972 | case elfcpp::R_386_TLS_LE: // Local-exec |
1973 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1974 | layout->set_has_static_tls(); |
07f397ab | 1975 | if (output_is_shared) |
7bf1f802 | 1976 | { |
2e702c99 RM |
1977 | // We need to create a dynamic relocation. |
1978 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
1979 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1980 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1981 | ? elfcpp::R_386_TLS_TPOFF32 | |
1982 | : elfcpp::R_386_TLS_TPOFF); | |
1983 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1984 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1985 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 1986 | } |
56622147 ILT |
1987 | break; |
1988 | ||
af6359d5 ILT |
1989 | default: |
1990 | gold_unreachable(); | |
7e1edb90 ILT |
1991 | } |
1992 | } | |
92e059d8 ILT |
1993 | break; |
1994 | ||
92e059d8 ILT |
1995 | case elfcpp::R_386_32PLT: |
1996 | case elfcpp::R_386_TLS_GD_32: | |
1997 | case elfcpp::R_386_TLS_GD_PUSH: | |
1998 | case elfcpp::R_386_TLS_GD_CALL: | |
1999 | case elfcpp::R_386_TLS_GD_POP: | |
2000 | case elfcpp::R_386_TLS_LDM_32: | |
2001 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2002 | case elfcpp::R_386_TLS_LDM_CALL: | |
2003 | case elfcpp::R_386_TLS_LDM_POP: | |
2004 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2005 | default: | |
af6359d5 | 2006 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
2007 | break; |
2008 | } | |
2009 | } | |
2010 | ||
af6359d5 ILT |
2011 | // Report an unsupported relocation against a global symbol. |
2012 | ||
2013 | void | |
6fa2a40b CC |
2014 | Target_i386::Scan::unsupported_reloc_global( |
2015 | Sized_relobj_file<32, false>* object, | |
2016 | unsigned int r_type, | |
2017 | Symbol* gsym) | |
af6359d5 | 2018 | { |
75f2446e | 2019 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2020 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
2021 | } |
2022 | ||
0897ed3b ST |
2023 | inline bool |
2024 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
2025 | { | |
2026 | switch (r_type) | |
2027 | { | |
2028 | case elfcpp::R_386_32: | |
2029 | case elfcpp::R_386_16: | |
2030 | case elfcpp::R_386_8: | |
2031 | case elfcpp::R_386_GOTOFF: | |
2032 | case elfcpp::R_386_GOT32: | |
2033 | { | |
2e702c99 | 2034 | return true; |
0897ed3b ST |
2035 | } |
2036 | default: | |
2037 | return false; | |
2038 | } | |
2039 | return false; | |
2040 | } | |
2041 | ||
2042 | inline bool | |
2043 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
2044 | Symbol_table* , | |
2045 | Layout* , | |
2046 | Target_i386* , | |
6fa2a40b | 2047 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2048 | unsigned int , |
2049 | Output_section* , | |
2050 | const elfcpp::Rel<32, false>& , | |
2051 | unsigned int r_type, | |
2052 | const elfcpp::Sym<32, false>&) | |
2053 | { | |
2054 | return possible_function_pointer_reloc(r_type); | |
2055 | } | |
2056 | ||
2057 | inline bool | |
2058 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
2059 | Symbol_table* , | |
2060 | Layout* , | |
2061 | Target_i386* , | |
6fa2a40b | 2062 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2063 | unsigned int , |
2064 | Output_section* , | |
2065 | const elfcpp::Rel<32, false>& , | |
2066 | unsigned int r_type, | |
2067 | Symbol*) | |
2068 | { | |
2069 | return possible_function_pointer_reloc(r_type); | |
2070 | } | |
2071 | ||
92e059d8 ILT |
2072 | // Scan a relocation for a global symbol. |
2073 | ||
2074 | inline void | |
ad0f2072 | 2075 | Target_i386::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2076 | Layout* layout, |
2077 | Target_i386* target, | |
2078 | Sized_relobj_file<32, false>* object, | |
2079 | unsigned int data_shndx, | |
2080 | Output_section* output_section, | |
2081 | const elfcpp::Rel<32, false>& reloc, | |
2082 | unsigned int r_type, | |
2083 | Symbol* gsym) | |
92e059d8 | 2084 | { |
7223e9ca ILT |
2085 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2086 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2087 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2088 | target->make_plt_entry(symtab, layout, gsym); | |
2089 | ||
92e059d8 ILT |
2090 | switch (r_type) |
2091 | { | |
2092 | case elfcpp::R_386_NONE: | |
2093 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 2094 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
2095 | break; |
2096 | ||
2097 | case elfcpp::R_386_32: | |
92e059d8 | 2098 | case elfcpp::R_386_16: |
92e059d8 | 2099 | case elfcpp::R_386_8: |
96f2030e | 2100 | { |
2e702c99 RM |
2101 | // Make a PLT entry if necessary. |
2102 | if (gsym->needs_plt_entry()) | |
2103 | { | |
2104 | target->make_plt_entry(symtab, layout, gsym); | |
2105 | // Since this is not a PC-relative relocation, we may be | |
2106 | // taking the address of a function. In that case we need to | |
2107 | // set the entry in the dynamic symbol table to the address of | |
2108 | // the PLT entry. | |
2109 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2110 | gsym->set_needs_dynsym_value(); | |
2111 | } | |
2112 | // Make a dynamic relocation if necessary. | |
2113 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2114 | { | |
2115 | if (gsym->may_need_copy_reloc()) | |
2116 | { | |
2117 | target->copy_reloc(symtab, layout, object, | |
2118 | data_shndx, output_section, gsym, reloc); | |
2119 | } | |
7223e9ca ILT |
2120 | else if (r_type == elfcpp::R_386_32 |
2121 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2122 | && gsym->can_use_relative_reloc(false) | |
2123 | && !gsym->is_from_dynobj() | |
2124 | && !gsym->is_undefined() | |
2125 | && !gsym->is_preemptible()) | |
2126 | { | |
2127 | // Use an IRELATIVE reloc for a locally defined | |
2128 | // STT_GNU_IFUNC symbol. This makes a function | |
2129 | // address in a PIE executable match the address in a | |
2130 | // shared library that it links against. | |
67181c72 | 2131 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
2132 | rel_dyn->add_symbolless_global_addend(gsym, |
2133 | elfcpp::R_386_IRELATIVE, | |
2134 | output_section, | |
2135 | object, data_shndx, | |
2136 | reloc.get_r_offset()); | |
2137 | } | |
2e702c99 RM |
2138 | else if (r_type == elfcpp::R_386_32 |
2139 | && gsym->can_use_relative_reloc(false)) | |
2140 | { | |
2141 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
2142 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2143 | output_section, object, | |
2144 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
2145 | } |
2146 | else | |
2147 | { | |
2148 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2149 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2150 | data_shndx, reloc.get_r_offset()); | |
2151 | } | |
2152 | } | |
d61c6bd4 ILT |
2153 | } |
2154 | break; | |
2155 | ||
2156 | case elfcpp::R_386_PC32: | |
2157 | case elfcpp::R_386_PC16: | |
2158 | case elfcpp::R_386_PC8: | |
2159 | { | |
2e702c99 RM |
2160 | // Make a PLT entry if necessary. |
2161 | if (gsym->needs_plt_entry()) | |
2162 | { | |
2163 | // These relocations are used for function calls only in | |
2164 | // non-PIC code. For a 32-bit relocation in a shared library, | |
2165 | // we'll need a text relocation anyway, so we can skip the | |
2166 | // PLT entry and let the dynamic linker bind the call directly | |
2167 | // to the target. For smaller relocations, we should use a | |
2168 | // PLT entry to ensure that the call can reach. | |
2169 | if (!parameters->options().shared() | |
2170 | || r_type != elfcpp::R_386_PC32) | |
2171 | target->make_plt_entry(symtab, layout, gsym); | |
2172 | } | |
2173 | // Make a dynamic relocation if necessary. | |
2174 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2175 | { | |
2176 | if (gsym->may_need_copy_reloc()) | |
2177 | { | |
2178 | target->copy_reloc(symtab, layout, object, | |
2179 | data_shndx, output_section, gsym, reloc); | |
2180 | } | |
2181 | else | |
2182 | { | |
2183 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2184 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2185 | data_shndx, reloc.get_r_offset()); | |
2186 | } | |
2187 | } | |
96f2030e | 2188 | } |
92e059d8 ILT |
2189 | break; |
2190 | ||
ead1e424 | 2191 | case elfcpp::R_386_GOT32: |
8462ae85 | 2192 | { |
2e702c99 RM |
2193 | // The symbol requires a GOT entry. |
2194 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
2195 | if (gsym->final_value_is_known()) | |
7223e9ca ILT |
2196 | { |
2197 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2198 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2199 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2200 | else | |
2201 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2202 | } | |
2e702c99 RM |
2203 | else |
2204 | { | |
2205 | // If this symbol is not fully resolved, we need to add a | |
2206 | // GOT entry with a dynamic relocation. | |
2207 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2208 | |
2209 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2210 | // | |
2211 | // 1) The symbol may be defined in some other module. | |
2212 | // | |
2213 | // 2) We are building a shared library and this is a | |
2214 | // protected symbol; using GLOB_DAT means that the dynamic | |
2215 | // linker can use the address of the PLT in the main | |
2216 | // executable when appropriate so that function address | |
2217 | // comparisons work. | |
2218 | // | |
2219 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2220 | // code, again so that function address comparisons work. | |
2e702c99 RM |
2221 | if (gsym->is_from_dynobj() |
2222 | || gsym->is_undefined() | |
2223 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2224 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2225 | && parameters->options().shared()) | |
7223e9ca ILT |
2226 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2227 | && parameters->options().output_is_position_independent())) | |
2e702c99 RM |
2228 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2229 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
2230 | else | |
2231 | { | |
7223e9ca ILT |
2232 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2233 | // offset into the GOT, so that function pointer | |
2234 | // comparisons work correctly. | |
2235 | bool is_new; | |
2236 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2237 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2238 | else | |
2239 | { | |
2240 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2241 | // Tell the dynamic linker to use the PLT address | |
2242 | // when resolving relocations. | |
2243 | if (gsym->is_from_dynobj() | |
2244 | && !parameters->options().shared()) | |
2245 | gsym->set_needs_dynsym_value(); | |
2246 | } | |
2e702c99 | 2247 | if (is_new) |
7223e9ca ILT |
2248 | { |
2249 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2250 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2251 | got, got_off); | |
2252 | } | |
2e702c99 RM |
2253 | } |
2254 | } | |
8462ae85 | 2255 | } |
ead1e424 ILT |
2256 | break; |
2257 | ||
2258 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2259 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2260 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2261 | if (gsym->final_value_is_known()) |
ead1e424 | 2262 | break; |
436ca963 ILT |
2263 | // If building a shared library, we can also skip the PLT entry |
2264 | // if the symbol is defined in the output file and is protected | |
2265 | // or hidden. | |
2266 | if (gsym->is_defined() | |
2e702c99 RM |
2267 | && !gsym->is_from_dynobj() |
2268 | && !gsym->is_preemptible()) | |
436ca963 | 2269 | break; |
7e1edb90 | 2270 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2271 | break; |
2272 | ||
2273 | case elfcpp::R_386_GOTOFF: | |
2274 | case elfcpp::R_386_GOTPC: | |
2275 | // We need a GOT section. | |
7e1edb90 | 2276 | target->got_section(symtab, layout); |
ead1e424 ILT |
2277 | break; |
2278 | ||
af6359d5 ILT |
2279 | // These are relocations which should only be seen by the |
2280 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2281 | case elfcpp::R_386_COPY: |
2282 | case elfcpp::R_386_GLOB_DAT: | |
2283 | case elfcpp::R_386_JUMP_SLOT: | |
2284 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2285 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2286 | case elfcpp::R_386_TLS_TPOFF: |
2287 | case elfcpp::R_386_TLS_DTPMOD32: | |
2288 | case elfcpp::R_386_TLS_DTPOFF32: | |
2289 | case elfcpp::R_386_TLS_TPOFF32: | |
2290 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2291 | gold_error(_("%s: unexpected reloc %u in object file"), |
2292 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2293 | break; |
2294 | ||
d61c17ea ILT |
2295 | // These are initial tls relocs, which are expected when |
2296 | // linking. | |
56622147 ILT |
2297 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2298 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2299 | case elfcpp::R_386_TLS_DESC_CALL: | |
2300 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2301 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2302 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2303 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2304 | case elfcpp::R_386_TLS_GOTIE: |
2305 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2306 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2307 | { |
7e1edb90 | 2308 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 | 2309 | const tls::Tls_optimization optimized_type |
2e702c99 | 2310 | = Target_i386::optimize_tls_reloc(is_final, r_type); |
a3ad94ed ILT |
2311 | switch (r_type) |
2312 | { | |
56622147 | 2313 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2314 | if (optimized_type == tls::TLSOPT_NONE) |
2315 | { | |
2e702c99 RM |
2316 | // Create a pair of GOT entries for the module index and |
2317 | // dtv-relative offset. | |
2318 | Output_data_got<32, false>* got | |
2319 | = target->got_section(symtab, layout); | |
2320 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
2321 | target->rel_dyn_section(layout), | |
2322 | elfcpp::R_386_TLS_DTPMOD32, | |
2323 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2324 | } |
2325 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2326 | { | |
2e702c99 RM |
2327 | // Create a GOT entry for the tp-relative offset. |
2328 | Output_data_got<32, false>* got | |
2329 | = target->got_section(symtab, layout); | |
2330 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2331 | target->rel_dyn_section(layout), | |
2332 | elfcpp::R_386_TLS_TPOFF); | |
07f397ab ILT |
2333 | } |
2334 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2335 | unsupported_reloc_global(object, r_type, gsym); | |
2336 | break; | |
2337 | ||
56622147 | 2338 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2339 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
2340 | if (optimized_type == tls::TLSOPT_NONE) |
2341 | { | |
2342 | // Create a double GOT entry with an R_386_TLS_DESC | |
2343 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2344 | // lazily, so the GOT entry needs to be in an area in | |
2345 | // .got.plt, not .got. Call got_section to make sure | |
2346 | // the section has been created. | |
a8df5856 | 2347 | target->got_section(symtab, layout); |
2e702c99 | 2348 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
e291e7b9 | 2349 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2e702c99 RM |
2350 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2351 | elfcpp::R_386_TLS_DESC, 0); | |
2352 | } | |
2353 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2354 | { | |
2355 | // Create a GOT entry for the tp-relative offset. | |
2356 | Output_data_got<32, false>* got | |
2357 | = target->got_section(symtab, layout); | |
2358 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2359 | target->rel_dyn_section(layout), | |
2360 | elfcpp::R_386_TLS_TPOFF); | |
2361 | } | |
2362 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2363 | unsupported_reloc_global(object, r_type, gsym); | |
c2b45e22 CC |
2364 | break; |
2365 | ||
2366 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2367 | break; |
2368 | ||
56622147 | 2369 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2370 | if (optimized_type == tls::TLSOPT_NONE) |
2371 | { | |
2e702c99 RM |
2372 | // Create a GOT entry for the module index. |
2373 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2374 | } |
2375 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2376 | unsupported_reloc_global(object, r_type, gsym); |
2377 | break; | |
2378 | ||
56622147 | 2379 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2380 | break; |
2381 | ||
56622147 ILT |
2382 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2383 | case elfcpp::R_386_TLS_IE_32: | |
2384 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2385 | layout->set_has_static_tls(); |
07f397ab ILT |
2386 | if (optimized_type == tls::TLSOPT_NONE) |
2387 | { | |
2e702c99 RM |
2388 | // For the R_386_TLS_IE relocation, we need to create a |
2389 | // dynamic relocation when building a shared library. | |
2390 | if (r_type == elfcpp::R_386_TLS_IE | |
2391 | && parameters->options().shared()) | |
2392 | { | |
2393 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2394 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2395 | output_section, object, | |
2396 | data_shndx, | |
2397 | reloc.get_r_offset()); | |
2398 | } | |
2399 | // Create a GOT entry for the tp-relative offset. | |
2400 | Output_data_got<32, false>* got | |
2401 | = target->got_section(symtab, layout); | |
2402 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2403 | ? elfcpp::R_386_TLS_TPOFF32 | |
2404 | : elfcpp::R_386_TLS_TPOFF); | |
2405 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2406 | ? GOT_TYPE_TLS_OFFSET | |
2407 | : GOT_TYPE_TLS_NOFFSET); | |
2408 | got->add_global_with_rel(gsym, got_type, | |
2409 | target->rel_dyn_section(layout), | |
2410 | dyn_r_type); | |
07f397ab ILT |
2411 | } |
2412 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2413 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2414 | break; |
af6359d5 | 2415 | |
56622147 ILT |
2416 | case elfcpp::R_386_TLS_LE: // Local-exec |
2417 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2418 | layout->set_has_static_tls(); |
8851ecca | 2419 | if (parameters->options().shared()) |
7bf1f802 | 2420 | { |
2e702c99 RM |
2421 | // We need to create a dynamic relocation. |
2422 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2423 | ? elfcpp::R_386_TLS_TPOFF32 | |
2424 | : elfcpp::R_386_TLS_TPOFF); | |
2425 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2426 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2427 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2428 | } |
56622147 ILT |
2429 | break; |
2430 | ||
af6359d5 ILT |
2431 | default: |
2432 | gold_unreachable(); | |
a3ad94ed ILT |
2433 | } |
2434 | } | |
92e059d8 ILT |
2435 | break; |
2436 | ||
92e059d8 ILT |
2437 | case elfcpp::R_386_32PLT: |
2438 | case elfcpp::R_386_TLS_GD_32: | |
2439 | case elfcpp::R_386_TLS_GD_PUSH: | |
2440 | case elfcpp::R_386_TLS_GD_CALL: | |
2441 | case elfcpp::R_386_TLS_GD_POP: | |
2442 | case elfcpp::R_386_TLS_LDM_32: | |
2443 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2444 | case elfcpp::R_386_TLS_LDM_CALL: | |
2445 | case elfcpp::R_386_TLS_LDM_POP: | |
2446 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2447 | default: | |
af6359d5 | 2448 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2449 | break; |
2450 | } | |
2451 | } | |
2452 | ||
6d03d481 ST |
2453 | // Process relocations for gc. |
2454 | ||
2455 | void | |
ad0f2072 | 2456 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
2457 | Layout* layout, |
2458 | Sized_relobj_file<32, false>* object, | |
2459 | unsigned int data_shndx, | |
2460 | unsigned int, | |
2461 | const unsigned char* prelocs, | |
2462 | size_t reloc_count, | |
2463 | Output_section* output_section, | |
2464 | bool needs_special_offset_handling, | |
2465 | size_t local_symbol_count, | |
2466 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
2467 | { |
2468 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
2e702c99 RM |
2469 | Target_i386::Scan, |
2470 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2471 | symtab, |
2472 | layout, | |
2473 | this, | |
2474 | object, | |
2475 | data_shndx, | |
2476 | prelocs, | |
2477 | reloc_count, | |
2478 | output_section, | |
2479 | needs_special_offset_handling, | |
2480 | local_symbol_count, | |
2481 | plocal_symbols); | |
2482 | } | |
2483 | ||
92e059d8 ILT |
2484 | // Scan relocations for a section. |
2485 | ||
2486 | void | |
ad0f2072 | 2487 | Target_i386::scan_relocs(Symbol_table* symtab, |
2e702c99 RM |
2488 | Layout* layout, |
2489 | Sized_relobj_file<32, false>* object, | |
2490 | unsigned int data_shndx, | |
2491 | unsigned int sh_type, | |
2492 | const unsigned char* prelocs, | |
2493 | size_t reloc_count, | |
2494 | Output_section* output_section, | |
2495 | bool needs_special_offset_handling, | |
2496 | size_t local_symbol_count, | |
2497 | const unsigned char* plocal_symbols) | |
92e059d8 ILT |
2498 | { |
2499 | if (sh_type == elfcpp::SHT_RELA) | |
2500 | { | |
75f2446e ILT |
2501 | gold_error(_("%s: unsupported RELA reloc section"), |
2502 | object->name().c_str()); | |
2503 | return; | |
92e059d8 ILT |
2504 | } |
2505 | ||
ead1e424 ILT |
2506 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2507 | Target_i386::Scan>( | |
92e059d8 | 2508 | symtab, |
ead1e424 ILT |
2509 | layout, |
2510 | this, | |
92e059d8 | 2511 | object, |
a3ad94ed | 2512 | data_shndx, |
92e059d8 ILT |
2513 | prelocs, |
2514 | reloc_count, | |
730cdc88 ILT |
2515 | output_section, |
2516 | needs_special_offset_handling, | |
92e059d8 | 2517 | local_symbol_count, |
730cdc88 | 2518 | plocal_symbols); |
92e059d8 ILT |
2519 | } |
2520 | ||
16649710 | 2521 | // Finalize the sections. |
5a6f7e2d ILT |
2522 | |
2523 | void | |
f59f41f3 DK |
2524 | Target_i386::do_finalize_sections( |
2525 | Layout* layout, | |
2526 | const Input_objects*, | |
e785ec03 | 2527 | Symbol_table* symtab) |
5a6f7e2d | 2528 | { |
ea715a34 ILT |
2529 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2530 | ? NULL | |
2531 | : this->plt_->rel_plt()); | |
2532 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2533 | this->rel_dyn_, true, false); |
16649710 ILT |
2534 | |
2535 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2536 | // relocs. | |
12c0daef ILT |
2537 | if (this->copy_relocs_.any_saved_relocs()) |
2538 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2539 | |
2540 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2541 | // the .got.plt section. | |
2542 | Symbol* sym = this->global_offset_table_; | |
2543 | if (sym != NULL) | |
2544 | { | |
2545 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2546 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2547 | } | |
28a13fec | 2548 | |
67181c72 ILT |
2549 | if (parameters->doing_static_link() |
2550 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2551 | { |
2552 | // If linking statically, make sure that the __rel_iplt symbols | |
2553 | // were defined if necessary, even if we didn't create a PLT. | |
2554 | static const Define_symbol_in_segment syms[] = | |
2555 | { | |
2556 | { | |
2557 | "__rel_iplt_start", // name | |
2558 | elfcpp::PT_LOAD, // segment_type | |
2559 | elfcpp::PF_W, // segment_flags_set | |
2560 | elfcpp::PF(0), // segment_flags_clear | |
2561 | 0, // value | |
2562 | 0, // size | |
2563 | elfcpp::STT_NOTYPE, // type | |
2564 | elfcpp::STB_GLOBAL, // binding | |
2565 | elfcpp::STV_HIDDEN, // visibility | |
2566 | 0, // nonvis | |
2567 | Symbol::SEGMENT_START, // offset_from_base | |
2568 | true // only_if_ref | |
2569 | }, | |
2570 | { | |
2571 | "__rel_iplt_end", // name | |
2572 | elfcpp::PT_LOAD, // segment_type | |
2573 | elfcpp::PF_W, // segment_flags_set | |
2574 | elfcpp::PF(0), // segment_flags_clear | |
2575 | 0, // value | |
2576 | 0, // size | |
2577 | elfcpp::STT_NOTYPE, // type | |
2578 | elfcpp::STB_GLOBAL, // binding | |
2579 | elfcpp::STV_HIDDEN, // visibility | |
2580 | 0, // nonvis | |
2581 | Symbol::SEGMENT_START, // offset_from_base | |
2582 | true // only_if_ref | |
2583 | } | |
2584 | }; | |
2585 | ||
2586 | symtab->define_symbols(layout, 2, syms, | |
2587 | layout->script_options()->saw_sections_clause()); | |
2588 | } | |
5a6f7e2d ILT |
2589 | } |
2590 | ||
86849f1f ILT |
2591 | // Return whether a direct absolute static relocation needs to be applied. |
2592 | // In cases where Scan::local() or Scan::global() has created | |
2593 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2594 | // of the relocation is carried in the data, and we must not | |
2595 | // apply the static relocation. | |
2596 | ||
2597 | inline bool | |
2598 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
2599 | unsigned int r_type, |
2600 | bool is_32bit, | |
031cdbed | 2601 | Output_section* output_section) |
86849f1f | 2602 | { |
031cdbed ILT |
2603 | // If the output section is not allocated, then we didn't call |
2604 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2605 | // the reloc here. | |
2606 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2607 | return true; | |
2608 | ||
95a2c8d6 RS |
2609 | int ref_flags = Scan::get_reference_flags(r_type); |
2610 | ||
d61c6bd4 ILT |
2611 | // For local symbols, we will have created a non-RELATIVE dynamic |
2612 | // relocation only if (a) the output is position independent, | |
2613 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2614 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2615 | if (gsym == NULL) |
8851ecca | 2616 | return !(parameters->options().output_is_position_independent() |
2e702c99 RM |
2617 | && (ref_flags & Symbol::ABSOLUTE_REF) |
2618 | && !is_32bit); | |
86849f1f | 2619 | |
0700cf32 ILT |
2620 | // For global symbols, we use the same helper routines used in the |
2621 | // scan pass. If we did not create a dynamic relocation, or if we | |
2622 | // created a RELATIVE dynamic relocation, we should apply the static | |
2623 | // relocation. | |
2624 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2625 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2e702c99 RM |
2626 | && gsym->can_use_relative_reloc(ref_flags |
2627 | & Symbol::FUNCTION_CALL); | |
0700cf32 | 2628 | return !has_dyn || is_rel; |
86849f1f ILT |
2629 | } |
2630 | ||
61ba1cf9 ILT |
2631 | // Perform a relocation. |
2632 | ||
ead1e424 | 2633 | inline bool |
92e059d8 | 2634 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
2e702c99 RM |
2635 | Target_i386* target, |
2636 | Output_section* output_section, | |
2637 | size_t relnum, | |
2638 | const elfcpp::Rel<32, false>& rel, | |
2639 | unsigned int r_type, | |
2640 | const Sized_symbol<32>* gsym, | |
2641 | const Symbol_value<32>* psymval, | |
2642 | unsigned char* view, | |
2643 | elfcpp::Elf_types<32>::Elf_Addr address, | |
2644 | section_size_type view_size) | |
61ba1cf9 | 2645 | { |
ead1e424 ILT |
2646 | if (this->skip_call_tls_get_addr_) |
2647 | { | |
5efc7cd2 | 2648 | if ((r_type != elfcpp::R_386_PLT32 |
2e702c99 | 2649 | && r_type != elfcpp::R_386_PC32) |
ead1e424 ILT |
2650 | || gsym == NULL |
2651 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2652 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2653 | _("missing expected TLS relocation")); | |
2654 | else | |
ead1e424 | 2655 | { |
75f2446e ILT |
2656 | this->skip_call_tls_get_addr_ = false; |
2657 | return false; | |
ead1e424 | 2658 | } |
ead1e424 ILT |
2659 | } |
2660 | ||
6fa2a40b | 2661 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2662 | |
a3ad94ed | 2663 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2664 | Symbol_value<32> symval; |
436ca963 | 2665 | if (gsym != NULL |
7223e9ca ILT |
2666 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2667 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2668 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2669 | && gsym->can_use_relative_reloc(false) |
2670 | && !gsym->is_from_dynobj() | |
2671 | && !gsym->is_undefined() | |
2672 | && !gsym->is_preemptible()) | |
2673 | { | |
2674 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2675 | // want to use the real value of the symbol, not the PLT offset. | |
2676 | } | |
2677 | else if (gsym != NULL | |
95a2c8d6 | 2678 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2679 | { |
67181c72 | 2680 | symval.set_output_value(target->plt_address_for_global(gsym) |
b8e6aad9 ILT |
2681 | + gsym->plt_offset()); |
2682 | psymval = &symval; | |
a3ad94ed | 2683 | } |
7223e9ca ILT |
2684 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2685 | { | |
2686 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2687 | if (object->local_has_plt_offset(r_sym)) | |
2688 | { | |
67181c72 | 2689 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
2690 | + object->local_plt_offset(r_sym)); |
2691 | psymval = &symval; | |
2692 | } | |
2693 | } | |
b8e6aad9 | 2694 | |
1b64748b | 2695 | // Get the GOT offset if needed. |
96f2030e ILT |
2696 | // The GOT pointer points to the end of the GOT section. |
2697 | // We need to subtract the size of the GOT section to get | |
2698 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2699 | bool have_got_offset = false; |
2700 | unsigned int got_offset = 0; | |
2701 | switch (r_type) | |
2702 | { | |
2703 | case elfcpp::R_386_GOT32: | |
2704 | if (gsym != NULL) | |
2e702c99 RM |
2705 | { |
2706 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
2707 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2708 | - target->got_size()); | |
2709 | } | |
1b64748b | 2710 | else |
2e702c99 RM |
2711 | { |
2712 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2713 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2714 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2715 | - target->got_size()); | |
2716 | } | |
1b64748b ILT |
2717 | have_got_offset = true; |
2718 | break; | |
2719 | ||
2720 | default: | |
2721 | break; | |
2722 | } | |
2723 | ||
61ba1cf9 ILT |
2724 | switch (r_type) |
2725 | { | |
2726 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2727 | case elfcpp::R_386_GNU_VTINHERIT: |
2728 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2729 | break; |
2730 | ||
2731 | case elfcpp::R_386_32: | |
95a2c8d6 | 2732 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2733 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2734 | break; |
2735 | ||
2736 | case elfcpp::R_386_PC32: | |
95a2c8d6 | 2737 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2738 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
92e059d8 ILT |
2739 | break; |
2740 | ||
2741 | case elfcpp::R_386_16: | |
95a2c8d6 | 2742 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2743 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2744 | break; |
2745 | ||
2746 | case elfcpp::R_386_PC16: | |
95a2c8d6 | 2747 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2748 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
61ba1cf9 ILT |
2749 | break; |
2750 | ||
92e059d8 | 2751 | case elfcpp::R_386_8: |
95a2c8d6 | 2752 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2753 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2754 | break; |
2755 | ||
2756 | case elfcpp::R_386_PC8: | |
95a2c8d6 | 2757 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2758 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
92e059d8 ILT |
2759 | break; |
2760 | ||
ead1e424 | 2761 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2762 | gold_assert(gsym == NULL |
2763 | || gsym->has_plt_offset() | |
99f8faca ILT |
2764 | || gsym->final_value_is_known() |
2765 | || (gsym->is_defined() | |
2766 | && !gsym->is_from_dynobj() | |
2767 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2768 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2769 | break; |
2770 | ||
2771 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2772 | gold_assert(have_got_offset); |
2773 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2774 | break; |
2775 | ||
2776 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2777 | { |
2778 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2779 | value = (psymval->value(object, 0) | |
96f2030e | 2780 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2781 | Relocate_functions<32, false>::rel32(view, value); |
2782 | } | |
ead1e424 ILT |
2783 | break; |
2784 | ||
2785 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2786 | { |
2787 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2788 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2789 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2790 | } | |
ead1e424 ILT |
2791 | break; |
2792 | ||
92e059d8 ILT |
2793 | case elfcpp::R_386_COPY: |
2794 | case elfcpp::R_386_GLOB_DAT: | |
2795 | case elfcpp::R_386_JUMP_SLOT: | |
2796 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2797 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2798 | // These are outstanding tls relocs, which are unexpected when |
2799 | // linking. | |
92e059d8 ILT |
2800 | case elfcpp::R_386_TLS_TPOFF: |
2801 | case elfcpp::R_386_TLS_DTPMOD32: | |
2802 | case elfcpp::R_386_TLS_DTPOFF32: | |
2803 | case elfcpp::R_386_TLS_TPOFF32: | |
2804 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2805 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2806 | _("unexpected reloc %u in object file"), | |
2807 | r_type); | |
92e059d8 ILT |
2808 | break; |
2809 | ||
d61c17ea ILT |
2810 | // These are initial tls relocs, which are expected when |
2811 | // linking. | |
56622147 ILT |
2812 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2813 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2814 | case elfcpp::R_386_TLS_DESC_CALL: | |
2815 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2816 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2817 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2818 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2819 | case elfcpp::R_386_TLS_GOTIE: |
2820 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2821 | case elfcpp::R_386_TLS_LE_32: |
07f397ab | 2822 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2e702c99 | 2823 | view, address, view_size); |
92e059d8 ILT |
2824 | break; |
2825 | ||
92e059d8 ILT |
2826 | case elfcpp::R_386_32PLT: |
2827 | case elfcpp::R_386_TLS_GD_32: | |
2828 | case elfcpp::R_386_TLS_GD_PUSH: | |
2829 | case elfcpp::R_386_TLS_GD_CALL: | |
2830 | case elfcpp::R_386_TLS_GD_POP: | |
2831 | case elfcpp::R_386_TLS_LDM_32: | |
2832 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2833 | case elfcpp::R_386_TLS_LDM_CALL: | |
2834 | case elfcpp::R_386_TLS_LDM_POP: | |
2835 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2836 | default: |
75f2446e ILT |
2837 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2838 | _("unsupported reloc %u"), | |
2839 | r_type); | |
92e059d8 ILT |
2840 | break; |
2841 | } | |
ead1e424 ILT |
2842 | |
2843 | return true; | |
92e059d8 ILT |
2844 | } |
2845 | ||
2846 | // Perform a TLS relocation. | |
2847 | ||
2848 | inline void | |
2849 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
2e702c99 | 2850 | Target_i386* target, |
92e059d8 ILT |
2851 | size_t relnum, |
2852 | const elfcpp::Rel<32, false>& rel, | |
2853 | unsigned int r_type, | |
c06b7b0b | 2854 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2855 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2856 | unsigned char* view, |
2857 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2858 | section_size_type view_size) |
92e059d8 ILT |
2859 | { |
2860 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2861 | |
6fa2a40b | 2862 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2863 | |
2864 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2865 | |
b3705d2a ILT |
2866 | const bool is_final = (gsym == NULL |
2867 | ? !parameters->options().shared() | |
2868 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2869 | const tls::Tls_optimization optimized_type |
2870 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2871 | switch (r_type) |
2872 | { | |
56622147 | 2873 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2874 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2875 | { |
62855347 ILT |
2876 | if (tls_segment == NULL) |
2877 | { | |
191f1a2d ILT |
2878 | gold_assert(parameters->errors()->error_count() > 0 |
2879 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2880 | return; |
2881 | } | |
56622147 ILT |
2882 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2883 | rel, r_type, value, view, | |
2884 | view_size); | |
92e059d8 ILT |
2885 | break; |
2886 | } | |
07f397ab | 2887 | else |
2e702c99 RM |
2888 | { |
2889 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2890 | ? GOT_TYPE_TLS_NOFFSET | |
2891 | : GOT_TYPE_TLS_PAIR); | |
2892 | unsigned int got_offset; | |
2893 | if (gsym != NULL) | |
2894 | { | |
2895 | gold_assert(gsym->has_got_offset(got_type)); | |
2896 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2897 | } | |
2898 | else | |
2899 | { | |
2900 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2901 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2902 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab | 2903 | - target->got_size()); |
2e702c99 RM |
2904 | } |
2905 | if (optimized_type == tls::TLSOPT_TO_IE) | |
07f397ab | 2906 | { |
7bf1f802 | 2907 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
2908 | got_offset, view, view_size); |
2909 | break; | |
2910 | } | |
2911 | else if (optimized_type == tls::TLSOPT_NONE) | |
2912 | { | |
2913 | // Relocate the field with the offset of the pair of GOT | |
2914 | // entries. | |
2915 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2916 | break; | |
07f397ab | 2917 | } |
2e702c99 | 2918 | } |
75f2446e ILT |
2919 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2920 | _("unsupported reloc %u"), | |
2921 | r_type); | |
92e059d8 ILT |
2922 | break; |
2923 | ||
56622147 ILT |
2924 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2925 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2926 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 | 2927 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 2928 | { |
62855347 ILT |
2929 | if (tls_segment == NULL) |
2930 | { | |
191f1a2d ILT |
2931 | gold_assert(parameters->errors()->error_count() > 0 |
2932 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2933 | return; |
2934 | } | |
c2b45e22 | 2935 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
2936 | rel, r_type, value, view, |
2937 | view_size); | |
c2b45e22 | 2938 | break; |
2e702c99 | 2939 | } |
c2b45e22 | 2940 | else |
2e702c99 RM |
2941 | { |
2942 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2943 | ? GOT_TYPE_TLS_NOFFSET | |
2944 | : GOT_TYPE_TLS_DESC); | |
2945 | unsigned int got_offset = 0; | |
a8df5856 ILT |
2946 | if (r_type == elfcpp::R_386_TLS_GOTDESC |
2947 | && optimized_type == tls::TLSOPT_NONE) | |
2948 | { | |
2949 | // We created GOT entries in the .got.tlsdesc portion of | |
2950 | // the .got.plt section, but the offset stored in the | |
2951 | // symbol is the offset within .got.tlsdesc. | |
2952 | got_offset = (target->got_size() | |
2953 | + target->got_plt_section()->data_size()); | |
2954 | } | |
2e702c99 RM |
2955 | if (gsym != NULL) |
2956 | { | |
2957 | gold_assert(gsym->has_got_offset(got_type)); | |
2958 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
2959 | } | |
2960 | else | |
2961 | { | |
2962 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2963 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2964 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 2965 | - target->got_size()); |
2e702c99 RM |
2966 | } |
2967 | if (optimized_type == tls::TLSOPT_TO_IE) | |
c2b45e22 | 2968 | { |
62855347 ILT |
2969 | if (tls_segment == NULL) |
2970 | { | |
191f1a2d ILT |
2971 | gold_assert(parameters->errors()->error_count() > 0 |
2972 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2973 | return; |
2974 | } | |
c2b45e22 | 2975 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
2976 | got_offset, view, view_size); |
2977 | break; | |
2978 | } | |
2979 | else if (optimized_type == tls::TLSOPT_NONE) | |
2980 | { | |
2981 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2982 | { | |
2983 | // Relocate the field with the offset of the pair of GOT | |
2984 | // entries. | |
2985 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2986 | } | |
2987 | break; | |
c2b45e22 | 2988 | } |
2e702c99 | 2989 | } |
75f2446e ILT |
2990 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2991 | _("unsupported reloc %u"), | |
2992 | r_type); | |
ead1e424 ILT |
2993 | break; |
2994 | ||
56622147 | 2995 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2996 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2997 | { | |
75f2446e ILT |
2998 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2999 | _("both SUN and GNU model " | |
3000 | "TLS relocations")); | |
3001 | break; | |
46cf9fa2 ILT |
3002 | } |
3003 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 3004 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 3005 | { |
62855347 ILT |
3006 | if (tls_segment == NULL) |
3007 | { | |
191f1a2d ILT |
3008 | gold_assert(parameters->errors()->error_count() > 0 |
3009 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3010 | return; |
3011 | } | |
46cf9fa2 ILT |
3012 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
3013 | value, view, view_size); | |
3014 | break; | |
3015 | } | |
07f397ab | 3016 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3017 | { |
3018 | // Relocate the field with the offset of the GOT entry for | |
3019 | // the module index. | |
3020 | unsigned int got_offset; | |
3021 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
94c4710f | 3022 | - target->got_size()); |
2e702c99 RM |
3023 | Relocate_functions<32, false>::rel32(view, got_offset); |
3024 | break; | |
3025 | } | |
75f2446e ILT |
3026 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3027 | _("unsupported reloc %u"), | |
3028 | r_type); | |
46cf9fa2 ILT |
3029 | break; |
3030 | ||
56622147 | 3031 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 3032 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 3033 | { |
82bb573a ILT |
3034 | // This reloc can appear in debugging sections, in which |
3035 | // case we must not convert to local-exec. We decide what | |
3036 | // to do based on whether the section is marked as | |
3037 | // containing executable code. That is what the GNU linker | |
3038 | // does as well. | |
3039 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
3040 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 3041 | { |
62855347 ILT |
3042 | if (tls_segment == NULL) |
3043 | { | |
191f1a2d ILT |
3044 | gold_assert(parameters->errors()->error_count() > 0 |
3045 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3046 | return; |
3047 | } | |
d6f22b98 ILT |
3048 | value -= tls_segment->memsz(); |
3049 | } | |
e8a9fcda | 3050 | } |
46cf9fa2 ILT |
3051 | Relocate_functions<32, false>::rel32(view, value); |
3052 | break; | |
3053 | ||
56622147 ILT |
3054 | case elfcpp::R_386_TLS_IE: // Initial-exec |
3055 | case elfcpp::R_386_TLS_GOTIE: | |
3056 | case elfcpp::R_386_TLS_IE_32: | |
3057 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3058 | { | |
62855347 ILT |
3059 | if (tls_segment == NULL) |
3060 | { | |
191f1a2d ILT |
3061 | gold_assert(parameters->errors()->error_count() > 0 |
3062 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3063 | return; |
3064 | } | |
56622147 ILT |
3065 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
3066 | rel, r_type, value, view, | |
3067 | view_size); | |
3068 | break; | |
3069 | } | |
07f397ab | 3070 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3071 | { |
3072 | // Relocate the field with the offset of the GOT entry for | |
3073 | // the tp-relative offset of the symbol. | |
c2b45e22 | 3074 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2e702c99 RM |
3075 | ? GOT_TYPE_TLS_OFFSET |
3076 | : GOT_TYPE_TLS_NOFFSET); | |
3077 | unsigned int got_offset; | |
3078 | if (gsym != NULL) | |
3079 | { | |
3080 | gold_assert(gsym->has_got_offset(got_type)); | |
3081 | got_offset = gsym->got_offset(got_type); | |
3082 | } | |
3083 | else | |
3084 | { | |
3085 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3086 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3087 | got_offset = object->local_got_offset(r_sym, got_type); | |
3088 | } | |
3089 | // For the R_386_TLS_IE relocation, we need to apply the | |
3090 | // absolute address of the GOT entry. | |
3091 | if (r_type == elfcpp::R_386_TLS_IE) | |
3092 | got_offset += target->got_plt_section()->address(); | |
3093 | // All GOT offsets are relative to the end of the GOT. | |
3094 | got_offset -= target->got_size(); | |
3095 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3096 | break; | |
3097 | } | |
75f2446e ILT |
3098 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3099 | _("unsupported reloc %u"), | |
3100 | r_type); | |
92e059d8 | 3101 | break; |
92e059d8 | 3102 | |
56622147 | 3103 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
3104 | // If we're creating a shared library, a dynamic relocation will |
3105 | // have been created for this location, so do not apply it now. | |
8851ecca | 3106 | if (!parameters->options().shared()) |
2e702c99 | 3107 | { |
62855347 ILT |
3108 | if (tls_segment == NULL) |
3109 | { | |
191f1a2d ILT |
3110 | gold_assert(parameters->errors()->error_count() > 0 |
3111 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3112 | return; |
3113 | } | |
2e702c99 RM |
3114 | value -= tls_segment->memsz(); |
3115 | Relocate_functions<32, false>::rel32(view, value); | |
3116 | } | |
56622147 | 3117 | break; |
92e059d8 | 3118 | |
56622147 | 3119 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
3120 | // If we're creating a shared library, a dynamic relocation will |
3121 | // have been created for this location, so do not apply it now. | |
8851ecca | 3122 | if (!parameters->options().shared()) |
2e702c99 | 3123 | { |
62855347 ILT |
3124 | if (tls_segment == NULL) |
3125 | { | |
191f1a2d ILT |
3126 | gold_assert(parameters->errors()->error_count() > 0 |
3127 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3128 | return; |
3129 | } | |
2e702c99 RM |
3130 | value = tls_segment->memsz() - value; |
3131 | Relocate_functions<32, false>::rel32(view, value); | |
3132 | } | |
56622147 | 3133 | break; |
92e059d8 | 3134 | } |
92e059d8 ILT |
3135 | } |
3136 | ||
e041f13d | 3137 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
3138 | // Local-Exec. |
3139 | ||
3140 | inline void | |
3141 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
3142 | size_t relnum, | |
3143 | Output_segment* tls_segment, | |
3144 | const elfcpp::Rel<32, false>& rel, | |
3145 | unsigned int, | |
3146 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3147 | unsigned char* view, | |
fe8718a4 | 3148 | section_size_type view_size) |
ead1e424 ILT |
3149 | { |
3150 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 3151 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
3152 | // leal foo(%reg),%eax; call ___tls_get_addr |
3153 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
3154 | ||
af6359d5 ILT |
3155 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3156 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
3157 | |
3158 | unsigned char op1 = view[-1]; | |
3159 | unsigned char op2 = view[-2]; | |
3160 | ||
af6359d5 | 3161 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3162 | op2 == 0x8d || op2 == 0x04); |
af6359d5 | 3163 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
ead1e424 ILT |
3164 | |
3165 | int roff = 5; | |
3166 | ||
3167 | if (op2 == 0x04) | |
3168 | { | |
af6359d5 ILT |
3169 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
3170 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3171 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3172 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
ead1e424 ILT |
3173 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
3174 | } | |
3175 | else | |
3176 | { | |
af6359d5 | 3177 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3178 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3179 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3180 | && view[9] == 0x90) |
ead1e424 ILT |
3181 | { |
3182 | // There is a trailing nop. Use the size byte subl. | |
3183 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3184 | roff = 6; | |
3185 | } | |
3186 | else | |
3187 | { | |
3188 | // Use the five byte subl. | |
3189 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3190 | } | |
3191 | } | |
3192 | ||
7bf1f802 | 3193 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3194 | Relocate_functions<32, false>::rel32(view + roff, value); |
3195 | ||
3196 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3197 | // We can skip it. | |
3198 | this->skip_call_tls_get_addr_ = true; | |
3199 | } | |
3200 | ||
7bf1f802 | 3201 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3202 | // Initial-Exec. |
3203 | ||
3204 | inline void | |
3205 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3206 | size_t relnum, | |
c2b45e22 | 3207 | Output_segment*, |
07f397ab ILT |
3208 | const elfcpp::Rel<32, false>& rel, |
3209 | unsigned int, | |
3210 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3211 | unsigned char* view, | |
fe8718a4 | 3212 | section_size_type view_size) |
07f397ab ILT |
3213 | { |
3214 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3215 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
3216 | ||
3217 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3218 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3219 | ||
3220 | unsigned char op1 = view[-1]; | |
3221 | unsigned char op2 = view[-2]; | |
3222 | ||
3223 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3224 | op2 == 0x8d || op2 == 0x04); |
07f397ab ILT |
3225 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
3226 | ||
3227 | int roff = 5; | |
3228 | ||
c2b45e22 CC |
3229 | // FIXME: For now, support only the first (SIB) form. |
3230 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
3231 | |
3232 | if (op2 == 0x04) | |
3233 | { | |
3234 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3235 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3236 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3237 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
07f397ab ILT |
3238 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); |
3239 | } | |
3240 | else | |
3241 | { | |
3242 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3243 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3244 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3245 | && view[9] == 0x90) |
07f397ab | 3246 | { |
2e702c99 | 3247 | // FIXME: This is not the right instruction sequence. |
07f397ab ILT |
3248 | // There is a trailing nop. Use the size byte subl. |
3249 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3250 | roff = 6; | |
3251 | } | |
3252 | else | |
3253 | { | |
2e702c99 | 3254 | // FIXME: This is not the right instruction sequence. |
07f397ab ILT |
3255 | // Use the five byte subl. |
3256 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3257 | } | |
3258 | } | |
3259 | ||
07f397ab ILT |
3260 | Relocate_functions<32, false>::rel32(view + roff, value); |
3261 | ||
3262 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3263 | // We can skip it. | |
3264 | this->skip_call_tls_get_addr_ = true; | |
3265 | } | |
3266 | ||
c2b45e22 CC |
3267 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3268 | // General-Dynamic to a Local-Exec. | |
3269 | ||
3270 | inline void | |
3271 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3272 | const Relocate_info<32, false>* relinfo, | |
3273 | size_t relnum, | |
3274 | Output_segment* tls_segment, | |
3275 | const elfcpp::Rel<32, false>& rel, | |
3276 | unsigned int r_type, | |
3277 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3278 | unsigned char* view, | |
3279 | section_size_type view_size) | |
3280 | { | |
3281 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3282 | { | |
3283 | // leal foo@TLSDESC(%ebx), %eax | |
3284 | // ==> leal foo@NTPOFF, %eax | |
3285 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3286 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3287 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3288 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3289 | view[-1] = 0x05; |
3290 | value -= tls_segment->memsz(); | |
3291 | Relocate_functions<32, false>::rel32(view, value); | |
3292 | } | |
3293 | else | |
3294 | { | |
3295 | // call *foo@TLSCALL(%eax) | |
3296 | // ==> nop; nop | |
3297 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3298 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3299 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3300 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3301 | view[0] = 0x66; |
3302 | view[1] = 0x90; | |
3303 | } | |
3304 | } | |
3305 | ||
3306 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3307 | // General-Dynamic to an Initial-Exec. | |
3308 | ||
3309 | inline void | |
3310 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3311 | const Relocate_info<32, false>* relinfo, | |
3312 | size_t relnum, | |
3313 | Output_segment*, | |
3314 | const elfcpp::Rel<32, false>& rel, | |
3315 | unsigned int r_type, | |
3316 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3317 | unsigned char* view, | |
3318 | section_size_type view_size) | |
3319 | { | |
3320 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3321 | { | |
3322 | // leal foo@TLSDESC(%ebx), %eax | |
3323 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3324 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3325 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3326 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3327 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3328 | view[-2] = 0x8b; |
3329 | Relocate_functions<32, false>::rel32(view, value); | |
3330 | } | |
3331 | else | |
3332 | { | |
3333 | // call *foo@TLSCALL(%eax) | |
3334 | // ==> nop; nop | |
3335 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3336 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3337 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3338 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3339 | view[0] = 0x66; |
3340 | view[1] = 0x90; | |
3341 | } | |
3342 | } | |
3343 | ||
46cf9fa2 ILT |
3344 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3345 | // Local-Exec. | |
3346 | ||
3347 | inline void | |
3348 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3349 | size_t relnum, | |
3350 | Output_segment*, | |
3351 | const elfcpp::Rel<32, false>& rel, | |
3352 | unsigned int, | |
3353 | elfcpp::Elf_types<32>::Elf_Addr, | |
3354 | unsigned char* view, | |
fe8718a4 | 3355 | section_size_type view_size) |
46cf9fa2 ILT |
3356 | { |
3357 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3358 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3359 | ||
af6359d5 ILT |
3360 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3361 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3362 | |
3363 | // FIXME: Does this test really always pass? | |
af6359d5 | 3364 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3365 | view[-2] == 0x8d && view[-1] == 0x83); |
46cf9fa2 | 3366 | |
af6359d5 | 3367 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3368 | |
3369 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3370 | ||
3371 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3372 | // We can skip it. | |
3373 | this->skip_call_tls_get_addr_ = true; | |
3374 | } | |
3375 | ||
56622147 ILT |
3376 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3377 | // Local-Exec. | |
3378 | ||
3379 | inline void | |
3380 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3381 | size_t relnum, | |
3382 | Output_segment* tls_segment, | |
3383 | const elfcpp::Rel<32, false>& rel, | |
3384 | unsigned int r_type, | |
3385 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3386 | unsigned char* view, | |
fe8718a4 | 3387 | section_size_type view_size) |
56622147 ILT |
3388 | { |
3389 | // We have to actually change the instructions, which means that we | |
3390 | // need to examine the opcodes to figure out which instruction we | |
3391 | // are looking at. | |
3392 | if (r_type == elfcpp::R_386_TLS_IE) | |
3393 | { | |
3394 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3395 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3396 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3397 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3398 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3399 | ||
3400 | unsigned char op1 = view[-1]; | |
3401 | if (op1 == 0xa1) | |
3402 | { | |
3403 | // movl XX,%eax ==> movl $YY,%eax | |
3404 | view[-1] = 0xb8; | |
3405 | } | |
3406 | else | |
3407 | { | |
3408 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3409 | ||
3410 | unsigned char op2 = view[-2]; | |
3411 | if (op2 == 0x8b) | |
3412 | { | |
3413 | // movl XX,%reg ==> movl $YY,%reg | |
3414 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3415 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3416 | view[-2] = 0xc7; |
3417 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3418 | } | |
3419 | else if (op2 == 0x03) | |
3420 | { | |
3421 | // addl XX,%reg ==> addl $YY,%reg | |
3422 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3423 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3424 | view[-2] = 0x81; |
3425 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3426 | } | |
3427 | else | |
3428 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3429 | } | |
3430 | } | |
3431 | else | |
3432 | { | |
3433 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3434 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3435 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3436 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3437 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3438 | ||
3439 | unsigned char op1 = view[-1]; | |
3440 | unsigned char op2 = view[-2]; | |
3441 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3442 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); |
56622147 ILT |
3443 | if (op2 == 0x8b) |
3444 | { | |
3445 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3446 | view[-2] = 0xc7; | |
3447 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3448 | } | |
3449 | else if (op2 == 0x2b) | |
3450 | { | |
3451 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3452 | view[-2] = 0x81; | |
3453 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3454 | } | |
3455 | else if (op2 == 0x03) | |
3456 | { | |
3457 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3458 | view[-2] = 0x81; | |
3459 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3460 | } | |
3461 | else | |
3462 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3463 | } | |
3464 | ||
7bf1f802 | 3465 | value = tls_segment->memsz() - value; |
56622147 ILT |
3466 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3467 | value = - value; | |
3468 | ||
3469 | Relocate_functions<32, false>::rel32(view, value); | |
3470 | } | |
3471 | ||
61ba1cf9 ILT |
3472 | // Relocate section data. |
3473 | ||
3474 | void | |
92e059d8 | 3475 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3476 | unsigned int sh_type, |
3477 | const unsigned char* prelocs, | |
3478 | size_t reloc_count, | |
730cdc88 ILT |
3479 | Output_section* output_section, |
3480 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3481 | unsigned char* view, |
3482 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3483 | section_size_type view_size, |
3484 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3485 | { |
a3ad94ed | 3486 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3487 | |
ead1e424 ILT |
3488 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
3489 | Target_i386::Relocate>( | |
92e059d8 | 3490 | relinfo, |
ead1e424 | 3491 | this, |
61ba1cf9 ILT |
3492 | prelocs, |
3493 | reloc_count, | |
730cdc88 ILT |
3494 | output_section, |
3495 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3496 | view, |
3497 | address, | |
364c7fa5 ILT |
3498 | view_size, |
3499 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3500 | } |
3501 | ||
6a74a719 ILT |
3502 | // Return the size of a relocation while scanning during a relocatable |
3503 | // link. | |
3504 | ||
3505 | unsigned int | |
3506 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3507 | unsigned int r_type, | |
3508 | Relobj* object) | |
3509 | { | |
3510 | switch (r_type) | |
3511 | { | |
3512 | case elfcpp::R_386_NONE: | |
3513 | case elfcpp::R_386_GNU_VTINHERIT: | |
3514 | case elfcpp::R_386_GNU_VTENTRY: | |
3515 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3516 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3517 | case elfcpp::R_386_TLS_DESC_CALL: | |
3518 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3519 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3520 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3521 | case elfcpp::R_386_TLS_IE_32: | |
3522 | case elfcpp::R_386_TLS_GOTIE: | |
3523 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3524 | case elfcpp::R_386_TLS_LE_32: | |
3525 | return 0; | |
3526 | ||
3527 | case elfcpp::R_386_32: | |
3528 | case elfcpp::R_386_PC32: | |
3529 | case elfcpp::R_386_GOT32: | |
3530 | case elfcpp::R_386_PLT32: | |
3531 | case elfcpp::R_386_GOTOFF: | |
3532 | case elfcpp::R_386_GOTPC: | |
3533 | return 4; | |
3534 | ||
3535 | case elfcpp::R_386_16: | |
3536 | case elfcpp::R_386_PC16: | |
3537 | return 2; | |
3538 | ||
3539 | case elfcpp::R_386_8: | |
3540 | case elfcpp::R_386_PC8: | |
3541 | return 1; | |
3542 | ||
3543 | // These are relocations which should only be seen by the | |
3544 | // dynamic linker, and should never be seen here. | |
3545 | case elfcpp::R_386_COPY: | |
3546 | case elfcpp::R_386_GLOB_DAT: | |
3547 | case elfcpp::R_386_JUMP_SLOT: | |
3548 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3549 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3550 | case elfcpp::R_386_TLS_TPOFF: |
3551 | case elfcpp::R_386_TLS_DTPMOD32: | |
3552 | case elfcpp::R_386_TLS_DTPOFF32: | |
3553 | case elfcpp::R_386_TLS_TPOFF32: | |
3554 | case elfcpp::R_386_TLS_DESC: | |
3555 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3556 | return 0; | |
3557 | ||
3558 | case elfcpp::R_386_32PLT: | |
3559 | case elfcpp::R_386_TLS_GD_32: | |
3560 | case elfcpp::R_386_TLS_GD_PUSH: | |
3561 | case elfcpp::R_386_TLS_GD_CALL: | |
3562 | case elfcpp::R_386_TLS_GD_POP: | |
3563 | case elfcpp::R_386_TLS_LDM_32: | |
3564 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3565 | case elfcpp::R_386_TLS_LDM_CALL: | |
3566 | case elfcpp::R_386_TLS_LDM_POP: | |
3567 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3568 | default: | |
3569 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3570 | return 0; | |
3571 | } | |
3572 | } | |
3573 | ||
3574 | // Scan the relocs during a relocatable link. | |
3575 | ||
3576 | void | |
ad0f2072 | 3577 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3578 | Layout* layout, |
6fa2a40b | 3579 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3580 | unsigned int data_shndx, |
3581 | unsigned int sh_type, | |
3582 | const unsigned char* prelocs, | |
3583 | size_t reloc_count, | |
3584 | Output_section* output_section, | |
3585 | bool needs_special_offset_handling, | |
3586 | size_t local_symbol_count, | |
3587 | const unsigned char* plocal_symbols, | |
3588 | Relocatable_relocs* rr) | |
3589 | { | |
3590 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3591 | ||
3592 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3593 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3594 | ||
7019cd25 | 3595 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3596 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3597 | symtab, |
3598 | layout, | |
3599 | object, | |
3600 | data_shndx, | |
3601 | prelocs, | |
3602 | reloc_count, | |
3603 | output_section, | |
3604 | needs_special_offset_handling, | |
3605 | local_symbol_count, | |
3606 | plocal_symbols, | |
3607 | rr); | |
3608 | } | |
3609 | ||
7404fe1b | 3610 | // Emit relocations for a section. |
6a74a719 ILT |
3611 | |
3612 | void | |
7404fe1b | 3613 | Target_i386::relocate_relocs( |
6a74a719 ILT |
3614 | const Relocate_info<32, false>* relinfo, |
3615 | unsigned int sh_type, | |
3616 | const unsigned char* prelocs, | |
3617 | size_t reloc_count, | |
3618 | Output_section* output_section, | |
3619 | off_t offset_in_output_section, | |
3620 | const Relocatable_relocs* rr, | |
3621 | unsigned char* view, | |
3622 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3623 | section_size_type view_size, | |
3624 | unsigned char* reloc_view, | |
3625 | section_size_type reloc_view_size) | |
3626 | { | |
3627 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3628 | ||
7404fe1b | 3629 | gold::relocate_relocs<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3630 | relinfo, |
3631 | prelocs, | |
3632 | reloc_count, | |
3633 | output_section, | |
3634 | offset_in_output_section, | |
3635 | rr, | |
3636 | view, | |
3637 | view_address, | |
3638 | view_size, | |
3639 | reloc_view, | |
3640 | reloc_view_size); | |
3641 | } | |
3642 | ||
ab5c9e90 ILT |
3643 | // Return the value to use for a dynamic which requires special |
3644 | // treatment. This is how we support equality comparisons of function | |
3645 | // pointers across shared library boundaries, as described in the | |
3646 | // processor specific ABI supplement. | |
3647 | ||
3648 | uint64_t | |
3649 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3650 | { | |
3651 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 3652 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
ab5c9e90 ILT |
3653 | } |
3654 | ||
c51e6221 ILT |
3655 | // Return a string used to fill a code section with nops to take up |
3656 | // the specified length. | |
3657 | ||
3658 | std::string | |
8851ecca | 3659 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3660 | { |
3661 | if (length >= 16) | |
3662 | { | |
3663 | // Build a jmp instruction to skip over the bytes. | |
3664 | unsigned char jmp[5]; | |
3665 | jmp[0] = 0xe9; | |
3666 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3667 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2e702c99 | 3668 | + std::string(length - 5, static_cast<char>(0x90))); |
c51e6221 ILT |
3669 | } |
3670 | ||
3671 | // Nop sequences of various lengths. | |
76677ad0 CC |
3672 | const char nop1[1] = { '\x90' }; // nop |
3673 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3674 | const char nop3[3] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi | |
3675 | const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
3676 | '\x00'}; | |
3677 | const char nop5[5] = { '\x90', '\x8d', '\x74', // nop | |
2e702c99 | 3678 | '\x26', '\x00' }; // leal 0(%esi,1),%esi |
76677ad0 | 3679 | const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi |
2e702c99 | 3680 | '\x00', '\x00', '\x00' }; |
76677ad0 | 3681 | const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3682 | '\x00', '\x00', '\x00', |
76677ad0 CC |
3683 | '\x00' }; |
3684 | const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop | |
2e702c99 | 3685 | '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi |
76677ad0 CC |
3686 | '\x00', '\x00' }; |
3687 | const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi | |
2e702c99 | 3688 | '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3689 | '\x00', '\x00', '\x00' }; |
3690 | const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi | |
2e702c99 | 3691 | '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3692 | '\x00', '\x00', '\x00', |
3693 | '\x00' }; | |
3694 | const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
2e702c99 | 3695 | '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3696 | '\x27', '\x00', '\x00', |
3697 | '\x00', '\x00' }; | |
3698 | const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3699 | '\x00', '\x00', '\x00', // leal 0L(%edi),%edi |
76677ad0 CC |
3700 | '\x8d', '\xbf', '\x00', |
3701 | '\x00', '\x00', '\x00' }; | |
3702 | const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3703 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3704 | '\x8d', '\xbc', '\x27', |
3705 | '\x00', '\x00', '\x00', | |
2e702c99 | 3706 | '\x00' }; |
76677ad0 | 3707 | const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3708 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3709 | '\x00', '\x8d', '\xbc', |
3710 | '\x27', '\x00', '\x00', | |
2e702c99 | 3711 | '\x00', '\x00' }; |
76677ad0 | 3712 | const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15 |
2e702c99 | 3713 | '\x90', '\x90', '\x90', // nop,nop,nop,... |
76677ad0 CC |
3714 | '\x90', '\x90', '\x90', |
3715 | '\x90', '\x90', '\x90', | |
2e702c99 | 3716 | '\x90', '\x90', '\x90' }; |
c51e6221 ILT |
3717 | |
3718 | const char* nops[16] = { | |
3719 | NULL, | |
3720 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3721 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3722 | }; | |
3723 | ||
3724 | return std::string(nops[length], length); | |
3725 | } | |
3726 | ||
02d7cd44 ILT |
3727 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3728 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3729 | // assembler can not write out the difference between two labels in | |
3730 | // different sections, so instead of using a pc-relative value they | |
3731 | // use an offset from the GOT. | |
3732 | ||
3733 | uint64_t | |
3734 | Target_i386::do_ehframe_datarel_base() const | |
3735 | { | |
3736 | gold_assert(this->global_offset_table_ != NULL); | |
3737 | Symbol* sym = this->global_offset_table_; | |
3738 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3739 | return ssym->value(); | |
3740 | } | |
3741 | ||
b6848d3c ILT |
3742 | // Return whether SYM should be treated as a call to a non-split |
3743 | // function. We don't want that to be true of a call to a | |
3744 | // get_pc_thunk function. | |
3745 | ||
3746 | bool | |
3747 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3748 | { | |
3749 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3750 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3751 | } | |
3752 | ||
364c7fa5 | 3753 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3754 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3755 | // code. We have to change the function so that it always ensures |
3756 | // that it has enough stack space to run some random function. | |
3757 | ||
3758 | void | |
3759 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2e702c99 RM |
3760 | section_offset_type fnoffset, |
3761 | section_size_type fnsize, | |
3762 | unsigned char* view, | |
3763 | section_size_type view_size, | |
3764 | std::string* from, | |
3765 | std::string* to) const | |
364c7fa5 ILT |
3766 | { |
3767 | // The function starts with a comparison of the stack pointer and a | |
3768 | // field in the TCB. This is followed by a jump. | |
3769 | ||
3770 | // cmp %gs:NN,%esp | |
3771 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3772 | && fnsize > 7) | |
3773 | { | |
3774 | // We will call __morestack if the carry flag is set after this | |
3775 | // comparison. We turn the comparison into an stc instruction | |
3776 | // and some nops. | |
3777 | view[fnoffset] = '\xf9'; | |
3778 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3779 | } | |
3780 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3781 | // lea NN(%esp),%edx |
3782 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3783 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3784 | && fnsize > 7) |
3785 | { | |
3786 | // This is loading an offset from the stack pointer for a | |
3787 | // comparison. The offset is negative, so we decrease the | |
3788 | // offset by the amount of space we need for the stack. This | |
3789 | // means we will avoid calling __morestack if there happens to | |
3790 | // be plenty of space on the stack already. | |
3791 | unsigned char* pval = view + fnoffset + 3; | |
3792 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3793 | val -= parameters->options().split_stack_adjust_size(); | |
3794 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3795 | } | |
3796 | else | |
3797 | { | |
3798 | if (!object->has_no_split_stack()) | |
3799 | object->error(_("failed to match split-stack sequence at " | |
3800 | "section %u offset %0zx"), | |
ac33a407 | 3801 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3802 | return; |
3803 | } | |
3804 | ||
3805 | // We have to change the function so that it calls | |
3806 | // __morestack_non_split instead of __morestack. The former will | |
3807 | // allocate additional stack space. | |
3808 | *from = "__morestack"; | |
3809 | *to = "__morestack_non_split"; | |
3810 | } | |
3811 | ||
2e702c99 RM |
3812 | // The selector for i386 object files. Note this is never instantiated |
3813 | // directly. It's only used in Target_selector_i386_nacl, below. | |
14bfc3f5 | 3814 | |
36959681 | 3815 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3816 | { |
3817 | public: | |
3818 | Target_selector_i386() | |
36959681 | 3819 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3820 | "elf32-i386", "elf32-i386-freebsd", |
3821 | "elf_i386") | |
14bfc3f5 ILT |
3822 | { } |
3823 | ||
3824 | Target* | |
e96caa79 ILT |
3825 | do_instantiate_target() |
3826 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3827 | }; |
3828 | ||
2e702c99 RM |
3829 | // NaCl variant. It uses different PLT contents. |
3830 | ||
3831 | class Output_data_plt_i386_nacl : public Output_data_plt_i386 | |
3832 | { | |
3833 | public: | |
3834 | Output_data_plt_i386_nacl(Layout* layout, | |
3835 | Output_data_space* got_plt, | |
3836 | Output_data_space* got_irelative) | |
3837 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
3838 | { } | |
3839 | ||
3840 | protected: | |
3841 | virtual unsigned int | |
3842 | do_get_plt_entry_size() const | |
3843 | { return plt_entry_size; } | |
3844 | ||
3845 | virtual void | |
3846 | do_add_eh_frame(Layout* layout) | |
3847 | { | |
3848 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
3849 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
3850 | } | |
3851 | ||
3852 | // The size of an entry in the PLT. | |
3853 | static const int plt_entry_size = 64; | |
3854 | ||
3855 | // The .eh_frame unwind information for the PLT. | |
3856 | static const int plt_eh_frame_fde_size = 32; | |
3857 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
3858 | }; | |
3859 | ||
3860 | class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl | |
3861 | { | |
3862 | public: | |
3863 | Output_data_plt_i386_nacl_exec(Layout* layout, | |
3864 | Output_data_space* got_plt, | |
3865 | Output_data_space* got_irelative) | |
3866 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3867 | { } | |
3868 | ||
3869 | protected: | |
3870 | virtual void | |
3871 | do_fill_first_plt_entry(unsigned char* pov, | |
3872 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
3873 | ||
3874 | virtual unsigned int | |
3875 | do_fill_plt_entry(unsigned char* pov, | |
3876 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
3877 | unsigned int got_offset, | |
3878 | unsigned int plt_offset, | |
3879 | unsigned int plt_rel_offset); | |
3880 | ||
3881 | private: | |
3882 | // The first entry in the PLT for an executable. | |
3883 | static const unsigned char first_plt_entry[plt_entry_size]; | |
3884 | ||
3885 | // Other entries in the PLT for an executable. | |
3886 | static const unsigned char plt_entry[plt_entry_size]; | |
3887 | }; | |
3888 | ||
3889 | class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl | |
3890 | { | |
3891 | public: | |
3892 | Output_data_plt_i386_nacl_dyn(Layout* layout, | |
3893 | Output_data_space* got_plt, | |
3894 | Output_data_space* got_irelative) | |
3895 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3896 | { } | |
3897 | ||
3898 | protected: | |
3899 | virtual void | |
3900 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
3901 | ||
3902 | virtual unsigned int | |
3903 | do_fill_plt_entry(unsigned char* pov, | |
3904 | elfcpp::Elf_types<32>::Elf_Addr, | |
3905 | unsigned int got_offset, | |
3906 | unsigned int plt_offset, | |
3907 | unsigned int plt_rel_offset); | |
3908 | ||
3909 | private: | |
3910 | // The first entry in the PLT for a shared object. | |
3911 | static const unsigned char first_plt_entry[plt_entry_size]; | |
3912 | ||
3913 | // Other entries in the PLT for a shared object. | |
3914 | static const unsigned char plt_entry[plt_entry_size]; | |
3915 | }; | |
3916 | ||
3917 | class Target_i386_nacl : public Target_i386 | |
3918 | { | |
3919 | public: | |
3920 | Target_i386_nacl() | |
3921 | : Target_i386(&i386_nacl_info) | |
3922 | { } | |
3923 | ||
3924 | protected: | |
3925 | virtual Output_data_plt_i386* | |
3926 | do_make_data_plt(Layout* layout, | |
3927 | Output_data_space* got_plt, | |
3928 | Output_data_space* got_irelative, | |
3929 | bool dyn) | |
3930 | { | |
3931 | if (dyn) | |
3932 | return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative); | |
3933 | else | |
3934 | return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative); | |
3935 | } | |
3936 | ||
3937 | private: | |
3938 | static const Target::Target_info i386_nacl_info; | |
3939 | }; | |
3940 | ||
3941 | const Target::Target_info Target_i386_nacl::i386_nacl_info = | |
3942 | { | |
3943 | 32, // size | |
3944 | false, // is_big_endian | |
3945 | elfcpp::EM_386, // machine_code | |
3946 | false, // has_make_symbol | |
3947 | false, // has_resolve | |
3948 | true, // has_code_fill | |
3949 | true, // is_default_stack_executable | |
3950 | true, // can_icf_inline_merge_sections | |
3951 | '\0', // wrap_char | |
3952 | "/lib/ld-nacl-x86-32.so.1", // dynamic_linker | |
3953 | 0x20000, // default_text_segment_address | |
3954 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
3955 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
3956 | true, // isolate_execinstr | |
3957 | 0x10000000, // rosegment_gap | |
3958 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3959 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3960 | 0, // small_common_section_flags | |
3961 | 0, // large_common_section_flags | |
3962 | NULL, // attributes_section | |
3963 | NULL // attributes_vendor | |
3964 | }; | |
3965 | ||
3966 | #define NACLMASK 0xe0 // 32-byte alignment mask | |
3967 | ||
3968 | const unsigned char | |
3969 | Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] = | |
3970 | { | |
3971 | 0xff, 0x35, // pushl contents of memory address | |
3972 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
3973 | 0x8b, 0x0d, // movl contents of address, %ecx | |
3974 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
3975 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
3976 | 0xff, 0xe1, // jmp *%ecx | |
3977 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3978 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3979 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3980 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3981 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3982 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3983 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
3984 | 0x90, 0x90, 0x90, 0x90, 0x90 | |
3985 | }; | |
3986 | ||
3987 | void | |
3988 | Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry( | |
3989 | unsigned char* pov, | |
3990 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
3991 | { | |
3992 | memcpy(pov, first_plt_entry, plt_entry_size); | |
3993 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
3994 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
3995 | } | |
3996 | ||
3997 | // The first entry in the PLT for a shared object. | |
3998 | ||
3999 | const unsigned char | |
4000 | Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] = | |
4001 | { | |
4002 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
4003 | 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx | |
4004 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4005 | 0xff, 0xe1, // jmp *%ecx | |
4006 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4007 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4008 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4009 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4010 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4011 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4012 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4013 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4014 | 0x90, 0x90, 0x90, 0x90, 0x90, // nops | |
4015 | 0x90, 0x90, 0x90, 0x90, 0x90 // nops | |
4016 | }; | |
4017 | ||
4018 | void | |
4019 | Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry( | |
4020 | unsigned char* pov, | |
4021 | elfcpp::Elf_types<32>::Elf_Addr) | |
4022 | { | |
4023 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4024 | } | |
4025 | ||
4026 | // Subsequent entries in the PLT for an executable. | |
4027 | ||
4028 | const unsigned char | |
4029 | Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] = | |
4030 | { | |
4031 | 0x8b, 0x0d, // movl contents of address, %ecx */ | |
4032 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4033 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4034 | 0xff, 0xe1, // jmp *%ecx | |
4035 | ||
4036 | // Pad to the next 32-byte boundary with nop instructions. | |
4037 | 0x90, | |
4038 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4039 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4040 | ||
4041 | // Lazy GOT entries point here (32-byte aligned). | |
4042 | 0x68, // pushl immediate | |
4043 | 0, 0, 0, 0, // replaced with offset into relocation table | |
4044 | 0xe9, // jmp relative | |
4045 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
4046 | ||
4047 | // Pad to the next 32-byte boundary with nop instructions. | |
4048 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4049 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4050 | 0x90, 0x90 | |
4051 | }; | |
4052 | ||
4053 | unsigned int | |
4054 | Output_data_plt_i386_nacl_exec::do_fill_plt_entry( | |
4055 | unsigned char* pov, | |
4056 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4057 | unsigned int got_offset, | |
4058 | unsigned int plt_offset, | |
4059 | unsigned int plt_rel_offset) | |
4060 | { | |
4061 | memcpy(pov, plt_entry, plt_entry_size); | |
4062 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4063 | got_address + got_offset); | |
4064 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4065 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4066 | return 32; | |
4067 | } | |
4068 | ||
4069 | // Subsequent entries in the PLT for a shared object. | |
4070 | ||
4071 | const unsigned char | |
4072 | Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] = | |
4073 | { | |
4074 | 0x8b, 0x8b, // movl offset(%ebx), %ecx | |
4075 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
4076 | 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx | |
4077 | 0xff, 0xe1, // jmp *%ecx | |
4078 | ||
4079 | // Pad to the next 32-byte boundary with nop instructions. | |
4080 | 0x90, | |
4081 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4082 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4083 | ||
4084 | // Lazy GOT entries point here (32-byte aligned). | |
4085 | 0x68, // pushl immediate | |
4086 | 0, 0, 0, 0, // replaced with offset into relocation table. | |
4087 | 0xe9, // jmp relative | |
4088 | 0, 0, 0, 0, // replaced with offset to start of .plt. | |
4089 | ||
4090 | // Pad to the next 32-byte boundary with nop instructions. | |
4091 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4092 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4093 | 0x90, 0x90 | |
4094 | }; | |
4095 | ||
4096 | unsigned int | |
4097 | Output_data_plt_i386_nacl_dyn::do_fill_plt_entry( | |
4098 | unsigned char* pov, | |
4099 | elfcpp::Elf_types<32>::Elf_Addr, | |
4100 | unsigned int got_offset, | |
4101 | unsigned int plt_offset, | |
4102 | unsigned int plt_rel_offset) | |
4103 | { | |
4104 | memcpy(pov, plt_entry, plt_entry_size); | |
4105 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
4106 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4107 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4108 | return 32; | |
4109 | } | |
4110 | ||
4111 | const unsigned char | |
4112 | Output_data_plt_i386_nacl::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4113 | { | |
4114 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4115 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4116 | 0, // Augmentation size. | |
4117 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
4118 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4119 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
4120 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4121 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4122 | 13, // Block length. | |
4123 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
4124 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
4125 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4126 | elfcpp::DW_OP_and, // & (%eip & 0x3f). | |
4127 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4128 | elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25) | |
4129 | elfcpp::DW_OP_lit2, // Push 2. | |
4130 | elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2) | |
4131 | elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4 | |
4132 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4133 | elfcpp::DW_CFA_nop | |
4134 | }; | |
4135 | ||
4136 | // The selector for i386-nacl object files. | |
4137 | ||
4138 | class Target_selector_i386_nacl | |
4139 | : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl> | |
4140 | { | |
4141 | public: | |
4142 | Target_selector_i386_nacl() | |
4143 | : Target_selector_nacl<Target_selector_i386, | |
4144 | Target_i386_nacl>("x86-32", | |
4145 | "elf32-i386-nacl", | |
4146 | "elf_i386_nacl") | |
4147 | { } | |
4148 | }; | |
4149 | ||
4150 | Target_selector_i386_nacl target_selector_i386; | |
14bfc3f5 ILT |
4151 | |
4152 | } // End anonymous namespace. |