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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, | |
cc928013 | 417 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
7404fe1b AM |
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(); |
19fec8c1 | 1154 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1155 | } |
1156 | ||
1157 | // Return the PLT address to use for a local symbol. These are always | |
1158 | // IRELATIVE relocs. | |
1159 | ||
1160 | uint64_t | |
19fec8c1 AM |
1161 | Output_data_plt_i386::address_for_local(const Relobj* object, |
1162 | unsigned int r_sym) | |
67181c72 | 1163 | { |
19fec8c1 AM |
1164 | return (this->address() |
1165 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1166 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1167 | } |
1168 | ||
a3ad94ed ILT |
1169 | // The first entry in the PLT for an executable. |
1170 | ||
2e702c99 | 1171 | const unsigned char Output_data_plt_i386_exec::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1172 | { |
1173 | 0xff, 0x35, // pushl contents of memory address | |
1174 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1175 | 0xff, 0x25, // jmp indirect | |
1176 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1177 | 0, 0, 0, 0 // unused | |
1178 | }; | |
1179 | ||
2e702c99 RM |
1180 | void |
1181 | Output_data_plt_i386_exec::do_fill_first_plt_entry( | |
1182 | unsigned char* pov, | |
1183 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
1184 | { | |
1185 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1186 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1187 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1188 | } | |
1189 | ||
a3ad94ed ILT |
1190 | // The first entry in the PLT for a shared object. |
1191 | ||
2e702c99 | 1192 | const unsigned char Output_data_plt_i386_dyn::first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1193 | { |
1194 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1195 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1196 | 0, 0, 0, 0 // unused | |
1197 | }; | |
1198 | ||
2e702c99 RM |
1199 | void |
1200 | Output_data_plt_i386_dyn::do_fill_first_plt_entry( | |
1201 | unsigned char* pov, | |
1202 | elfcpp::Elf_types<32>::Elf_Addr) | |
1203 | { | |
1204 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1205 | } | |
1206 | ||
a3ad94ed ILT |
1207 | // Subsequent entries in the PLT for an executable. |
1208 | ||
2e702c99 | 1209 | const unsigned char Output_data_plt_i386_exec::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1210 | { |
1211 | 0xff, 0x25, // jmp indirect | |
1212 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1213 | 0x68, // pushl immediate | |
1214 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1215 | 0xe9, // jmp relative | |
1216 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1217 | }; | |
1218 | ||
2e702c99 RM |
1219 | unsigned int |
1220 | Output_data_plt_i386_exec::do_fill_plt_entry( | |
1221 | unsigned char* pov, | |
1222 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
1223 | unsigned int got_offset, | |
1224 | unsigned int plt_offset, | |
1225 | unsigned int plt_rel_offset) | |
1226 | { | |
1227 | memcpy(pov, plt_entry, plt_entry_size); | |
1228 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1229 | got_address + got_offset); | |
1230 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1231 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1232 | return 6; | |
1233 | } | |
1234 | ||
a3ad94ed ILT |
1235 | // Subsequent entries in the PLT for a shared object. |
1236 | ||
2e702c99 | 1237 | const unsigned char Output_data_plt_i386_dyn::plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1238 | { |
1239 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1240 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1241 | 0x68, // pushl immediate | |
1242 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1243 | 0xe9, // jmp relative | |
1244 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1245 | }; | |
1246 | ||
2e702c99 RM |
1247 | unsigned int |
1248 | Output_data_plt_i386_dyn::do_fill_plt_entry(unsigned char* pov, | |
1249 | elfcpp::Elf_types<32>::Elf_Addr, | |
1250 | unsigned int got_offset, | |
1251 | unsigned int plt_offset, | |
1252 | unsigned int plt_rel_offset) | |
1253 | { | |
1254 | memcpy(pov, plt_entry, plt_entry_size); | |
1255 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1256 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1257 | elfcpp::Swap<32, false>::writeval(pov + 12, - (plt_offset + 12 + 4)); | |
1258 | return 6; | |
1259 | } | |
1260 | ||
07a60597 ILT |
1261 | // The .eh_frame unwind information for the PLT. |
1262 | ||
1263 | const unsigned char | |
1264 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1265 | { | |
1266 | 1, // CIE version. | |
1267 | 'z', // Augmentation: augmentation size included. | |
1268 | 'R', // Augmentation: FDE encoding included. | |
1269 | '\0', // End of augmentation string. | |
1270 | 1, // Code alignment factor. | |
1271 | 0x7c, // Data alignment factor. | |
1272 | 8, // Return address column. | |
1273 | 1, // Augmentation size. | |
1274 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1275 | | elfcpp::DW_EH_PE_sdata4), | |
1276 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1277 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1278 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1279 | elfcpp::DW_CFA_nop | |
1280 | }; | |
1281 | ||
1282 | const unsigned char | |
2e702c99 | 1283 | Output_data_plt_i386_standard::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1284 | { |
1285 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1286 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1287 | 0, // Augmentation size. | |
1288 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1289 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1290 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1291 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1292 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1293 | 11, // Block length. | |
1294 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1295 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1296 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1297 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1298 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1299 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1300 | elfcpp::DW_OP_lit2, // Push 2. | |
1301 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1302 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1303 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1304 | elfcpp::DW_CFA_nop, | |
1305 | elfcpp::DW_CFA_nop, | |
1306 | elfcpp::DW_CFA_nop | |
1307 | }; | |
1308 | ||
a3ad94ed ILT |
1309 | // Write out the PLT. This uses the hand-coded instructions above, |
1310 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1311 | // Processor Supplement. | |
1312 | ||
1313 | void | |
1314 | Output_data_plt_i386::do_write(Output_file* of) | |
1315 | { | |
2ea97941 | 1316 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1317 | const section_size_type oview_size = |
1318 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1319 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1320 | |
1321 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1322 | gold_assert(parameters->incremental_update() |
1323 | || (got_file_offset + this->got_plt_->data_size() | |
1324 | == this->got_irelative_->offset())); | |
fe8718a4 | 1325 | const section_size_type got_size = |
67181c72 ILT |
1326 | convert_to_section_size_type(this->got_plt_->data_size() |
1327 | + this->got_irelative_->data_size()); | |
a3ad94ed ILT |
1328 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1329 | got_size); | |
1330 | ||
1331 | unsigned char* pov = oview; | |
1332 | ||
1333 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1334 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1335 | ||
2e702c99 RM |
1336 | this->fill_first_plt_entry(pov, got_address); |
1337 | pov += this->get_plt_entry_size(); | |
a3ad94ed ILT |
1338 | |
1339 | unsigned char* got_pov = got_view; | |
1340 | ||
7d172687 ILT |
1341 | // The first entry in the GOT is the address of the .dynamic section |
1342 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1343 | // We saved space for them when we created the section in | |
1344 | // Target_i386::got_section. | |
1345 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1346 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1347 | elfcpp::Swap<32, false>::writeval(got_pov, dynamic_addr); | |
1348 | got_pov += 4; | |
1349 | memset(got_pov, 0, 8); | |
1350 | got_pov += 8; | |
a3ad94ed ILT |
1351 | |
1352 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1353 | ||
2e702c99 | 1354 | unsigned int plt_offset = this->get_plt_entry_size(); |
a3ad94ed ILT |
1355 | unsigned int plt_rel_offset = 0; |
1356 | unsigned int got_offset = 12; | |
67181c72 | 1357 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1358 | for (unsigned int i = 0; |
1359 | i < count; | |
1360 | ++i, | |
2e702c99 | 1361 | pov += this->get_plt_entry_size(), |
a3ad94ed | 1362 | got_pov += 4, |
2e702c99 | 1363 | plt_offset += this->get_plt_entry_size(), |
a3ad94ed ILT |
1364 | plt_rel_offset += rel_size, |
1365 | got_offset += 4) | |
1366 | { | |
1367 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1368 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1369 | got_address, | |
1370 | got_offset, | |
1371 | plt_offset, | |
1372 | plt_rel_offset); | |
a3ad94ed ILT |
1373 | |
1374 | // Set the entry in the GOT. | |
2e702c99 RM |
1375 | elfcpp::Swap<32, false>::writeval(got_pov, |
1376 | plt_address + plt_offset + lazy_offset); | |
a3ad94ed ILT |
1377 | } |
1378 | ||
7223e9ca ILT |
1379 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1380 | // the GOT to point to the actual symbol value, rather than point to | |
1381 | // the PLT entry. That will let the dynamic linker call the right | |
1382 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1383 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1384 | for (std::vector<Global_ifunc>::const_iterator p = |
1385 | this->global_ifuncs_.begin(); | |
1386 | p != this->global_ifuncs_.end(); | |
1387 | ++p) | |
1388 | { | |
1389 | const Sized_symbol<32>* ssym = | |
1390 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1391 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1392 | ssym->value()); |
1393 | } | |
1394 | ||
1395 | for (std::vector<Local_ifunc>::const_iterator p = | |
1396 | this->local_ifuncs_.begin(); | |
1397 | p != this->local_ifuncs_.end(); | |
1398 | ++p) | |
1399 | { | |
1400 | const Symbol_value<32>* psymval = | |
1401 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1402 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1403 | psymval->value(p->object, 0)); |
1404 | } | |
1405 | ||
fe8718a4 ILT |
1406 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1407 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1408 | |
2ea97941 | 1409 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1410 | of->write_output_view(got_file_offset, got_size, got_view); |
1411 | } | |
1412 | ||
7223e9ca | 1413 | // Create the PLT section. |
a3ad94ed ILT |
1414 | |
1415 | void | |
7223e9ca | 1416 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1417 | { |
a3ad94ed ILT |
1418 | if (this->plt_ == NULL) |
1419 | { | |
1420 | // Create the GOT sections first. | |
7e1edb90 | 1421 | this->got_section(symtab, layout); |
a3ad94ed | 1422 | |
2e702c99 RM |
1423 | const bool dyn = parameters->options().output_is_position_independent(); |
1424 | this->plt_ = this->make_data_plt(layout, | |
1425 | this->got_plt_, | |
1426 | this->got_irelative_, | |
1427 | dyn); | |
1428 | ||
1429 | // Add unwind information if requested. | |
1430 | if (parameters->options().ld_generated_unwind_info()) | |
1431 | this->plt_->add_eh_frame(layout); | |
1432 | ||
16649710 ILT |
1433 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1434 | (elfcpp::SHF_ALLOC | |
1435 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1436 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1437 | |
1438 | // Make the sh_info field of .rel.plt point to .plt. | |
1439 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1440 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1441 | } |
7223e9ca | 1442 | } |
a3ad94ed | 1443 | |
7223e9ca ILT |
1444 | // Create a PLT entry for a global symbol. |
1445 | ||
1446 | void | |
1447 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1448 | { | |
1449 | if (gsym->has_plt_offset()) | |
1450 | return; | |
1451 | if (this->plt_ == NULL) | |
1452 | this->make_plt_section(symtab, layout); | |
67181c72 | 1453 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1454 | } |
1455 | ||
7223e9ca ILT |
1456 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1457 | ||
1458 | void | |
1459 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1460 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1461 | unsigned int local_sym_index) |
1462 | { | |
1463 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1464 | return; | |
1465 | if (this->plt_ == NULL) | |
1466 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1467 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1468 | relobj, | |
7223e9ca ILT |
1469 | local_sym_index); |
1470 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1471 | } | |
1472 | ||
0e70b911 CC |
1473 | // Return the number of entries in the PLT. |
1474 | ||
1475 | unsigned int | |
1476 | Target_i386::plt_entry_count() const | |
1477 | { | |
1478 | if (this->plt_ == NULL) | |
1479 | return 0; | |
1480 | return this->plt_->entry_count(); | |
1481 | } | |
1482 | ||
1483 | // Return the offset of the first non-reserved PLT entry. | |
1484 | ||
1485 | unsigned int | |
1486 | Target_i386::first_plt_entry_offset() const | |
1487 | { | |
2e702c99 | 1488 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1489 | } |
1490 | ||
1491 | // Return the size of each PLT entry. | |
1492 | ||
1493 | unsigned int | |
1494 | Target_i386::plt_entry_size() const | |
1495 | { | |
2e702c99 | 1496 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1497 | } |
1498 | ||
e291e7b9 ILT |
1499 | // Get the section to use for TLS_DESC relocations. |
1500 | ||
1501 | Target_i386::Reloc_section* | |
1502 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1503 | { | |
1504 | return this->plt_section()->rel_tls_desc(layout); | |
1505 | } | |
1506 | ||
9fa33bee | 1507 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1508 | |
1509 | void | |
1510 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1511 | { | |
1512 | if (this->tls_base_symbol_defined_) | |
1513 | return; | |
1514 | ||
1515 | Output_segment* tls_segment = layout->tls_segment(); | |
1516 | if (tls_segment != NULL) | |
1517 | { | |
183fd0e3 | 1518 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1519 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1520 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1521 | tls_segment, 0, 0, |
1522 | elfcpp::STT_TLS, | |
1523 | elfcpp::STB_LOCAL, | |
1524 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1525 | (is_exec |
1526 | ? Symbol::SEGMENT_END | |
1527 | : Symbol::SEGMENT_START), | |
1528 | true); | |
edfbb029 CC |
1529 | } |
1530 | this->tls_base_symbol_defined_ = true; | |
1531 | } | |
1532 | ||
94c4710f ILT |
1533 | // Create a GOT entry for the TLS module index. |
1534 | ||
1535 | unsigned int | |
1536 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2e702c99 | 1537 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1538 | { |
1539 | if (this->got_mod_index_offset_ == -1U) | |
1540 | { | |
1541 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1542 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1543 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1544 | unsigned int got_offset = got->add_constant(0); | |
1545 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
2e702c99 | 1546 | got_offset); |
009a67a2 | 1547 | got->add_constant(0); |
94c4710f ILT |
1548 | this->got_mod_index_offset_ = got_offset; |
1549 | } | |
1550 | return this->got_mod_index_offset_; | |
1551 | } | |
1552 | ||
92e059d8 | 1553 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1554 | // symbol. IS_FINAL is true if the final address of this symbol is |
1555 | // known at link time. | |
92e059d8 | 1556 | |
af6359d5 | 1557 | tls::Tls_optimization |
7e1edb90 | 1558 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1559 | { |
1560 | // If we are generating a shared library, then we can't do anything | |
1561 | // in the linker. | |
8851ecca | 1562 | if (parameters->options().shared()) |
af6359d5 | 1563 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1564 | |
1565 | switch (r_type) | |
1566 | { | |
1567 | case elfcpp::R_386_TLS_GD: | |
1568 | case elfcpp::R_386_TLS_GOTDESC: | |
1569 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1570 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1571 | // access. Since we know that we are generating an executable, |
1572 | // we can convert this to Initial-Exec. If we also know that | |
1573 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1574 | if (is_final) |
af6359d5 ILT |
1575 | return tls::TLSOPT_TO_LE; |
1576 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1577 | |
1578 | case elfcpp::R_386_TLS_LDM: | |
1579 | // This is Local-Dynamic, which refers to a local symbol in the | |
1580 | // dynamic TLS block. Since we know that we generating an | |
1581 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1582 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1583 | |
1584 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1585 | // Another type of Local-Dynamic relocation. |
1586 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1587 | |
1588 | case elfcpp::R_386_TLS_IE: | |
1589 | case elfcpp::R_386_TLS_GOTIE: | |
1590 | case elfcpp::R_386_TLS_IE_32: | |
1591 | // These are Initial-Exec relocs which get the thread offset | |
1592 | // from the GOT. If we know that we are linking against the | |
1593 | // local symbol, we can switch to Local-Exec, which links the | |
1594 | // thread offset into the instruction. | |
a3ad94ed | 1595 | if (is_final) |
af6359d5 ILT |
1596 | return tls::TLSOPT_TO_LE; |
1597 | return tls::TLSOPT_NONE; | |
8462ae85 | 1598 | |
92e059d8 ILT |
1599 | case elfcpp::R_386_TLS_LE: |
1600 | case elfcpp::R_386_TLS_LE_32: | |
1601 | // When we already have Local-Exec, there is nothing further we | |
1602 | // can do. | |
af6359d5 | 1603 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1604 | |
1605 | default: | |
a3ad94ed | 1606 | gold_unreachable(); |
92e059d8 ILT |
1607 | } |
1608 | } | |
1609 | ||
95a2c8d6 | 1610 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1611 | |
95a2c8d6 RS |
1612 | int |
1613 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1614 | { |
1615 | switch (r_type) | |
1616 | { | |
1617 | case elfcpp::R_386_NONE: | |
1618 | case elfcpp::R_386_GNU_VTINHERIT: | |
1619 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1620 | case elfcpp::R_386_GOTPC: |
1621 | // No symbol reference. | |
1622 | return 0; | |
7223e9ca ILT |
1623 | |
1624 | case elfcpp::R_386_32: | |
1625 | case elfcpp::R_386_16: | |
1626 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1627 | return Symbol::ABSOLUTE_REF; |
1628 | ||
7223e9ca ILT |
1629 | case elfcpp::R_386_PC32: |
1630 | case elfcpp::R_386_PC16: | |
1631 | case elfcpp::R_386_PC8: | |
7223e9ca | 1632 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1633 | return Symbol::RELATIVE_REF; |
1634 | ||
1635 | case elfcpp::R_386_PLT32: | |
1636 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1637 | ||
7223e9ca | 1638 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1639 | // Absolute in GOT. |
1640 | return Symbol::ABSOLUTE_REF; | |
1641 | ||
1642 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1643 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1644 | case elfcpp::R_386_TLS_DESC_CALL: | |
1645 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1646 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1647 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1648 | case elfcpp::R_386_TLS_IE_32: | |
1649 | case elfcpp::R_386_TLS_GOTIE: | |
1650 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1651 | case elfcpp::R_386_TLS_LE_32: | |
1652 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1653 | |
1654 | case elfcpp::R_386_COPY: | |
1655 | case elfcpp::R_386_GLOB_DAT: | |
1656 | case elfcpp::R_386_JUMP_SLOT: | |
1657 | case elfcpp::R_386_RELATIVE: | |
1658 | case elfcpp::R_386_IRELATIVE: | |
1659 | case elfcpp::R_386_TLS_TPOFF: | |
1660 | case elfcpp::R_386_TLS_DTPMOD32: | |
1661 | case elfcpp::R_386_TLS_DTPOFF32: | |
1662 | case elfcpp::R_386_TLS_TPOFF32: | |
1663 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1664 | case elfcpp::R_386_32PLT: |
1665 | case elfcpp::R_386_TLS_GD_32: | |
1666 | case elfcpp::R_386_TLS_GD_PUSH: | |
1667 | case elfcpp::R_386_TLS_GD_CALL: | |
1668 | case elfcpp::R_386_TLS_GD_POP: | |
1669 | case elfcpp::R_386_TLS_LDM_32: | |
1670 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1671 | case elfcpp::R_386_TLS_LDM_CALL: | |
1672 | case elfcpp::R_386_TLS_LDM_POP: | |
1673 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1674 | default: | |
95a2c8d6 RS |
1675 | // Not expected. We will give an error later. |
1676 | return 0; | |
7223e9ca ILT |
1677 | } |
1678 | } | |
1679 | ||
95a2c8d6 RS |
1680 | // Report an unsupported relocation against a local symbol. |
1681 | ||
1682 | void | |
6fa2a40b | 1683 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1684 | unsigned int r_type) |
1685 | { | |
1686 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1687 | object->name().c_str(), r_type); | |
1688 | } | |
1689 | ||
1690 | // Return whether we need to make a PLT entry for a relocation of a | |
1691 | // given type against a STT_GNU_IFUNC symbol. | |
1692 | ||
1693 | bool | |
6fa2a40b CC |
1694 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1695 | Sized_relobj_file<32, false>* object, | |
1696 | unsigned int r_type) | |
95a2c8d6 RS |
1697 | { |
1698 | int flags = Scan::get_reference_flags(r_type); | |
1699 | if (flags & Symbol::TLS_REF) | |
1700 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 1701 | object->name().c_str(), r_type); |
95a2c8d6 RS |
1702 | return flags != 0; |
1703 | } | |
1704 | ||
92e059d8 ILT |
1705 | // Scan a relocation for a local symbol. |
1706 | ||
1707 | inline void | |
ad0f2072 | 1708 | Target_i386::Scan::local(Symbol_table* symtab, |
bfdfa4cd AM |
1709 | Layout* layout, |
1710 | Target_i386* target, | |
1711 | Sized_relobj_file<32, false>* object, | |
1712 | unsigned int data_shndx, | |
1713 | Output_section* output_section, | |
1714 | const elfcpp::Rel<32, false>& reloc, | |
1715 | unsigned int r_type, | |
1716 | const elfcpp::Sym<32, false>& lsym, | |
1717 | bool is_discarded) | |
92e059d8 | 1718 | { |
bfdfa4cd AM |
1719 | if (is_discarded) |
1720 | return; | |
1721 | ||
7223e9ca ILT |
1722 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1723 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1724 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1725 | { | |
1726 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1727 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1728 | } | |
1729 | ||
92e059d8 ILT |
1730 | switch (r_type) |
1731 | { | |
1732 | case elfcpp::R_386_NONE: | |
1733 | case elfcpp::R_386_GNU_VTINHERIT: | |
1734 | case elfcpp::R_386_GNU_VTENTRY: | |
1735 | break; | |
1736 | ||
1737 | case elfcpp::R_386_32: | |
436ca963 ILT |
1738 | // If building a shared library (or a position-independent |
1739 | // executable), we need to create a dynamic relocation for | |
1740 | // this location. The relocation applied at link time will | |
1741 | // apply the link-time value, so we flag the location with | |
1742 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1743 | // relocate it easily. | |
8851ecca | 1744 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1745 | { |
1746 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1747 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1748 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1749 | output_section, data_shndx, | |
1750 | reloc.get_r_offset()); | |
2e702c99 | 1751 | } |
d61c6bd4 ILT |
1752 | break; |
1753 | ||
1754 | case elfcpp::R_386_16: | |
1755 | case elfcpp::R_386_8: | |
1756 | // If building a shared library (or a position-independent | |
1757 | // executable), we need to create a dynamic relocation for | |
1758 | // this location. Because the addend needs to remain in the | |
1759 | // data section, we need to be careful not to apply this | |
1760 | // relocation statically. | |
8851ecca | 1761 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
1762 | { |
1763 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1764 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
2e702c99 | 1765 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1766 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1767 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1768 | else |
1769 | { | |
1770 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1771 | unsigned int shndx = lsym.get_st_shndx(); |
1772 | bool is_ordinary; | |
1773 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1774 | &is_ordinary); | |
1775 | if (!is_ordinary) | |
1776 | object->error(_("section symbol %u has bad shndx %u"), | |
1777 | r_sym, shndx); | |
1778 | else | |
1779 | rel_dyn->add_local_section(object, shndx, | |
1780 | r_type, output_section, | |
1781 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
1782 | } |
1783 | } | |
92e059d8 ILT |
1784 | break; |
1785 | ||
1786 | case elfcpp::R_386_PC32: | |
1787 | case elfcpp::R_386_PC16: | |
1788 | case elfcpp::R_386_PC8: | |
1789 | break; | |
1790 | ||
df2efe71 ILT |
1791 | case elfcpp::R_386_PLT32: |
1792 | // Since we know this is a local symbol, we can handle this as a | |
1793 | // PC32 reloc. | |
1794 | break; | |
1795 | ||
ead1e424 ILT |
1796 | case elfcpp::R_386_GOTOFF: |
1797 | case elfcpp::R_386_GOTPC: | |
1798 | // We need a GOT section. | |
7e1edb90 | 1799 | target->got_section(symtab, layout); |
ead1e424 ILT |
1800 | break; |
1801 | ||
1b64748b ILT |
1802 | case elfcpp::R_386_GOT32: |
1803 | { | |
2e702c99 RM |
1804 | // The symbol requires a GOT entry. |
1805 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1806 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1807 | |
1808 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1809 | // lets function pointers compare correctly with shared | |
1810 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1811 | bool is_new; | |
1812 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1813 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1814 | else | |
1815 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
1816 | if (is_new) |
1817 | { | |
1818 | // If we are generating a shared object, we need to add a | |
1819 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
1820 | if (parameters->options().output_is_position_independent()) | |
1821 | { | |
1822 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1823 | unsigned int got_offset = |
1824 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1825 | rel_dyn->add_local_relative(object, r_sym, | |
1826 | elfcpp::R_386_RELATIVE, | |
1827 | got, got_offset); | |
2e702c99 RM |
1828 | } |
1829 | } | |
1b64748b ILT |
1830 | } |
1831 | break; | |
1832 | ||
af6359d5 ILT |
1833 | // These are relocations which should only be seen by the |
1834 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1835 | case elfcpp::R_386_COPY: |
1836 | case elfcpp::R_386_GLOB_DAT: | |
1837 | case elfcpp::R_386_JUMP_SLOT: | |
1838 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1839 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1840 | case elfcpp::R_386_TLS_TPOFF: |
1841 | case elfcpp::R_386_TLS_DTPMOD32: | |
1842 | case elfcpp::R_386_TLS_DTPOFF32: | |
1843 | case elfcpp::R_386_TLS_TPOFF32: | |
1844 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1845 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1846 | object->name().c_str(), r_type); |
92e059d8 ILT |
1847 | break; |
1848 | ||
af6359d5 | 1849 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1850 | // linking. |
56622147 ILT |
1851 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1852 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1853 | case elfcpp::R_386_TLS_DESC_CALL: | |
1854 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1855 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1856 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1857 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1858 | case elfcpp::R_386_TLS_GOTIE: |
1859 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1860 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1861 | { |
8851ecca | 1862 | bool output_is_shared = parameters->options().shared(); |
af6359d5 | 1863 | const tls::Tls_optimization optimized_type |
2e702c99 | 1864 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); |
7e1edb90 ILT |
1865 | switch (r_type) |
1866 | { | |
56622147 | 1867 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1868 | if (optimized_type == tls::TLSOPT_NONE) |
1869 | { | |
2e702c99 RM |
1870 | // Create a pair of GOT entries for the module index and |
1871 | // dtv-relative offset. | |
1872 | Output_data_got<32, false>* got | |
1873 | = target->got_section(symtab, layout); | |
1874 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1875 | unsigned int shndx = lsym.get_st_shndx(); |
1876 | bool is_ordinary; | |
1877 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1878 | if (!is_ordinary) | |
1879 | object->error(_("local symbol %u has bad shndx %u"), | |
1880 | r_sym, shndx); | |
2e702c99 | 1881 | else |
d491d34e ILT |
1882 | got->add_local_pair_with_rel(object, r_sym, shndx, |
1883 | GOT_TYPE_TLS_PAIR, | |
1884 | target->rel_dyn_section(layout), | |
bd73a62d | 1885 | elfcpp::R_386_TLS_DTPMOD32); |
07f397ab ILT |
1886 | } |
1887 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1888 | unsupported_reloc_local(object, r_type); | |
1889 | break; | |
1890 | ||
56622147 | 1891 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1892 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
1893 | if (optimized_type == tls::TLSOPT_NONE) |
1894 | { | |
1895 | // Create a double GOT entry with an R_386_TLS_DESC | |
1896 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1897 | // lazily, so the GOT entry needs to be in an area in | |
1898 | // .got.plt, not .got. Call got_section to make sure | |
1899 | // the section has been created. | |
a8df5856 | 1900 | target->got_section(symtab, layout); |
2e702c99 RM |
1901 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
1902 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
e291e7b9 ILT |
1903 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1904 | { | |
1905 | unsigned int got_offset = got->add_constant(0); | |
1906 | // The local symbol value is stored in the second | |
1907 | // GOT entry. | |
1908 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1909 | // That set the GOT offset of the local symbol to | |
1910 | // point to the second entry, but we want it to | |
1911 | // point to the first. | |
1912 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1913 | got_offset); | |
1914 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1915 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1916 | } | |
2e702c99 RM |
1917 | } |
1918 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1919 | unsupported_reloc_local(object, r_type); | |
af6359d5 ILT |
1920 | break; |
1921 | ||
c2b45e22 CC |
1922 | case elfcpp::R_386_TLS_DESC_CALL: |
1923 | break; | |
1924 | ||
56622147 | 1925 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1926 | if (optimized_type == tls::TLSOPT_NONE) |
1927 | { | |
2e702c99 RM |
1928 | // Create a GOT entry for the module index. |
1929 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
1930 | } |
1931 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1932 | unsupported_reloc_local(object, r_type); |
1933 | break; | |
1934 | ||
56622147 | 1935 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1936 | break; |
1937 | ||
56622147 ILT |
1938 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1939 | case elfcpp::R_386_TLS_IE_32: | |
1940 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1941 | layout->set_has_static_tls(); |
07f397ab ILT |
1942 | if (optimized_type == tls::TLSOPT_NONE) |
1943 | { | |
2e702c99 RM |
1944 | // For the R_386_TLS_IE relocation, we need to create a |
1945 | // dynamic relocation when building a shared library. | |
1946 | if (r_type == elfcpp::R_386_TLS_IE | |
1947 | && parameters->options().shared()) | |
1948 | { | |
1949 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1950 | unsigned int r_sym | |
1951 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1952 | rel_dyn->add_local_relative(object, r_sym, | |
1953 | elfcpp::R_386_RELATIVE, | |
1954 | output_section, data_shndx, | |
1955 | reloc.get_r_offset()); | |
1956 | } | |
1957 | // Create a GOT entry for the tp-relative offset. | |
1958 | Output_data_got<32, false>* got | |
1959 | = target->got_section(symtab, layout); | |
1960 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1961 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1962 | ? elfcpp::R_386_TLS_TPOFF32 | |
1963 | : elfcpp::R_386_TLS_TPOFF); | |
1964 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1965 | ? GOT_TYPE_TLS_OFFSET | |
1966 | : GOT_TYPE_TLS_NOFFSET); | |
1967 | got->add_local_with_rel(object, r_sym, got_type, | |
1968 | target->rel_dyn_section(layout), | |
1969 | dyn_r_type); | |
07f397ab ILT |
1970 | } |
1971 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1972 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1973 | break; |
af6359d5 | 1974 | |
56622147 ILT |
1975 | case elfcpp::R_386_TLS_LE: // Local-exec |
1976 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1977 | layout->set_has_static_tls(); |
07f397ab | 1978 | if (output_is_shared) |
7bf1f802 | 1979 | { |
2e702c99 RM |
1980 | // We need to create a dynamic relocation. |
1981 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
1982 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1983 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1984 | ? elfcpp::R_386_TLS_TPOFF32 | |
1985 | : elfcpp::R_386_TLS_TPOFF); | |
1986 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1987 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1988 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 1989 | } |
56622147 ILT |
1990 | break; |
1991 | ||
af6359d5 ILT |
1992 | default: |
1993 | gold_unreachable(); | |
7e1edb90 ILT |
1994 | } |
1995 | } | |
92e059d8 ILT |
1996 | break; |
1997 | ||
92e059d8 ILT |
1998 | case elfcpp::R_386_32PLT: |
1999 | case elfcpp::R_386_TLS_GD_32: | |
2000 | case elfcpp::R_386_TLS_GD_PUSH: | |
2001 | case elfcpp::R_386_TLS_GD_CALL: | |
2002 | case elfcpp::R_386_TLS_GD_POP: | |
2003 | case elfcpp::R_386_TLS_LDM_32: | |
2004 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2005 | case elfcpp::R_386_TLS_LDM_CALL: | |
2006 | case elfcpp::R_386_TLS_LDM_POP: | |
2007 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2008 | default: | |
af6359d5 | 2009 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
2010 | break; |
2011 | } | |
2012 | } | |
2013 | ||
af6359d5 ILT |
2014 | // Report an unsupported relocation against a global symbol. |
2015 | ||
2016 | void | |
6fa2a40b CC |
2017 | Target_i386::Scan::unsupported_reloc_global( |
2018 | Sized_relobj_file<32, false>* object, | |
2019 | unsigned int r_type, | |
2020 | Symbol* gsym) | |
af6359d5 | 2021 | { |
75f2446e | 2022 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2023 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
2024 | } |
2025 | ||
0897ed3b ST |
2026 | inline bool |
2027 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
2028 | { | |
2029 | switch (r_type) | |
2030 | { | |
2031 | case elfcpp::R_386_32: | |
2032 | case elfcpp::R_386_16: | |
2033 | case elfcpp::R_386_8: | |
2034 | case elfcpp::R_386_GOTOFF: | |
2035 | case elfcpp::R_386_GOT32: | |
2036 | { | |
2e702c99 | 2037 | return true; |
0897ed3b ST |
2038 | } |
2039 | default: | |
2040 | return false; | |
2041 | } | |
2042 | return false; | |
2043 | } | |
2044 | ||
2045 | inline bool | |
2046 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
2047 | Symbol_table* , | |
2048 | Layout* , | |
2049 | Target_i386* , | |
6fa2a40b | 2050 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2051 | unsigned int , |
2052 | Output_section* , | |
2053 | const elfcpp::Rel<32, false>& , | |
2054 | unsigned int r_type, | |
2055 | const elfcpp::Sym<32, false>&) | |
2056 | { | |
2057 | return possible_function_pointer_reloc(r_type); | |
2058 | } | |
2059 | ||
2060 | inline bool | |
2061 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
2062 | Symbol_table* , | |
2063 | Layout* , | |
2064 | Target_i386* , | |
6fa2a40b | 2065 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
2066 | unsigned int , |
2067 | Output_section* , | |
2068 | const elfcpp::Rel<32, false>& , | |
2069 | unsigned int r_type, | |
2070 | Symbol*) | |
2071 | { | |
2072 | return possible_function_pointer_reloc(r_type); | |
2073 | } | |
2074 | ||
92e059d8 ILT |
2075 | // Scan a relocation for a global symbol. |
2076 | ||
2077 | inline void | |
ad0f2072 | 2078 | Target_i386::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2079 | Layout* layout, |
2080 | Target_i386* target, | |
2081 | Sized_relobj_file<32, false>* object, | |
2082 | unsigned int data_shndx, | |
2083 | Output_section* output_section, | |
2084 | const elfcpp::Rel<32, false>& reloc, | |
2085 | unsigned int r_type, | |
2086 | Symbol* gsym) | |
92e059d8 | 2087 | { |
7223e9ca ILT |
2088 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2089 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2090 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2091 | target->make_plt_entry(symtab, layout, gsym); | |
2092 | ||
92e059d8 ILT |
2093 | switch (r_type) |
2094 | { | |
2095 | case elfcpp::R_386_NONE: | |
2096 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 2097 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
2098 | break; |
2099 | ||
2100 | case elfcpp::R_386_32: | |
92e059d8 | 2101 | case elfcpp::R_386_16: |
92e059d8 | 2102 | case elfcpp::R_386_8: |
96f2030e | 2103 | { |
2e702c99 RM |
2104 | // Make a PLT entry if necessary. |
2105 | if (gsym->needs_plt_entry()) | |
2106 | { | |
2107 | target->make_plt_entry(symtab, layout, gsym); | |
2108 | // Since this is not a PC-relative relocation, we may be | |
2109 | // taking the address of a function. In that case we need to | |
2110 | // set the entry in the dynamic symbol table to the address of | |
2111 | // the PLT entry. | |
2112 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2113 | gsym->set_needs_dynsym_value(); | |
2114 | } | |
2115 | // Make a dynamic relocation if necessary. | |
2116 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2117 | { | |
2118 | if (gsym->may_need_copy_reloc()) | |
2119 | { | |
2120 | target->copy_reloc(symtab, layout, object, | |
2121 | data_shndx, output_section, gsym, reloc); | |
2122 | } | |
7223e9ca ILT |
2123 | else if (r_type == elfcpp::R_386_32 |
2124 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2125 | && gsym->can_use_relative_reloc(false) | |
2126 | && !gsym->is_from_dynobj() | |
2127 | && !gsym->is_undefined() | |
2128 | && !gsym->is_preemptible()) | |
2129 | { | |
2130 | // Use an IRELATIVE reloc for a locally defined | |
2131 | // STT_GNU_IFUNC symbol. This makes a function | |
2132 | // address in a PIE executable match the address in a | |
2133 | // shared library that it links against. | |
67181c72 | 2134 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
2135 | rel_dyn->add_symbolless_global_addend(gsym, |
2136 | elfcpp::R_386_IRELATIVE, | |
2137 | output_section, | |
2138 | object, data_shndx, | |
2139 | reloc.get_r_offset()); | |
2140 | } | |
2e702c99 RM |
2141 | else if (r_type == elfcpp::R_386_32 |
2142 | && gsym->can_use_relative_reloc(false)) | |
2143 | { | |
2144 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
2145 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2146 | output_section, object, | |
2147 | data_shndx, reloc.get_r_offset()); | |
2e702c99 RM |
2148 | } |
2149 | else | |
2150 | { | |
2151 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2152 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2153 | data_shndx, reloc.get_r_offset()); | |
2154 | } | |
2155 | } | |
d61c6bd4 ILT |
2156 | } |
2157 | break; | |
2158 | ||
2159 | case elfcpp::R_386_PC32: | |
2160 | case elfcpp::R_386_PC16: | |
2161 | case elfcpp::R_386_PC8: | |
2162 | { | |
2e702c99 RM |
2163 | // Make a PLT entry if necessary. |
2164 | if (gsym->needs_plt_entry()) | |
2165 | { | |
2166 | // These relocations are used for function calls only in | |
2167 | // non-PIC code. For a 32-bit relocation in a shared library, | |
2168 | // we'll need a text relocation anyway, so we can skip the | |
2169 | // PLT entry and let the dynamic linker bind the call directly | |
2170 | // to the target. For smaller relocations, we should use a | |
2171 | // PLT entry to ensure that the call can reach. | |
2172 | if (!parameters->options().shared() | |
2173 | || r_type != elfcpp::R_386_PC32) | |
2174 | target->make_plt_entry(symtab, layout, gsym); | |
2175 | } | |
2176 | // Make a dynamic relocation if necessary. | |
2177 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2178 | { | |
2179 | if (gsym->may_need_copy_reloc()) | |
2180 | { | |
2181 | target->copy_reloc(symtab, layout, object, | |
2182 | data_shndx, output_section, gsym, reloc); | |
2183 | } | |
2184 | else | |
2185 | { | |
2186 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2187 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2188 | data_shndx, reloc.get_r_offset()); | |
2189 | } | |
2190 | } | |
96f2030e | 2191 | } |
92e059d8 ILT |
2192 | break; |
2193 | ||
ead1e424 | 2194 | case elfcpp::R_386_GOT32: |
8462ae85 | 2195 | { |
2e702c99 RM |
2196 | // The symbol requires a GOT entry. |
2197 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
2198 | if (gsym->final_value_is_known()) | |
7223e9ca ILT |
2199 | { |
2200 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2201 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2202 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2203 | else | |
2204 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2205 | } | |
2e702c99 RM |
2206 | else |
2207 | { | |
2208 | // If this symbol is not fully resolved, we need to add a | |
2209 | // GOT entry with a dynamic relocation. | |
2210 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2211 | |
2212 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2213 | // | |
2214 | // 1) The symbol may be defined in some other module. | |
2215 | // | |
2216 | // 2) We are building a shared library and this is a | |
2217 | // protected symbol; using GLOB_DAT means that the dynamic | |
2218 | // linker can use the address of the PLT in the main | |
2219 | // executable when appropriate so that function address | |
2220 | // comparisons work. | |
2221 | // | |
2222 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2223 | // code, again so that function address comparisons work. | |
2e702c99 RM |
2224 | if (gsym->is_from_dynobj() |
2225 | || gsym->is_undefined() | |
2226 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2227 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2228 | && parameters->options().shared()) | |
7223e9ca ILT |
2229 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2230 | && parameters->options().output_is_position_independent())) | |
2e702c99 RM |
2231 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2232 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
2233 | else | |
2234 | { | |
7223e9ca ILT |
2235 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2236 | // offset into the GOT, so that function pointer | |
2237 | // comparisons work correctly. | |
2238 | bool is_new; | |
2239 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2240 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2241 | else | |
2242 | { | |
2243 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2244 | // Tell the dynamic linker to use the PLT address | |
2245 | // when resolving relocations. | |
2246 | if (gsym->is_from_dynobj() | |
2247 | && !parameters->options().shared()) | |
2248 | gsym->set_needs_dynsym_value(); | |
2249 | } | |
2e702c99 | 2250 | if (is_new) |
7223e9ca ILT |
2251 | { |
2252 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2253 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2254 | got, got_off); | |
2255 | } | |
2e702c99 RM |
2256 | } |
2257 | } | |
8462ae85 | 2258 | } |
ead1e424 ILT |
2259 | break; |
2260 | ||
2261 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2262 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2263 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2264 | if (gsym->final_value_is_known()) |
ead1e424 | 2265 | break; |
436ca963 ILT |
2266 | // If building a shared library, we can also skip the PLT entry |
2267 | // if the symbol is defined in the output file and is protected | |
2268 | // or hidden. | |
2269 | if (gsym->is_defined() | |
2e702c99 RM |
2270 | && !gsym->is_from_dynobj() |
2271 | && !gsym->is_preemptible()) | |
436ca963 | 2272 | break; |
7e1edb90 | 2273 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2274 | break; |
2275 | ||
2276 | case elfcpp::R_386_GOTOFF: | |
2277 | case elfcpp::R_386_GOTPC: | |
2278 | // We need a GOT section. | |
7e1edb90 | 2279 | target->got_section(symtab, layout); |
ead1e424 ILT |
2280 | break; |
2281 | ||
af6359d5 ILT |
2282 | // These are relocations which should only be seen by the |
2283 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2284 | case elfcpp::R_386_COPY: |
2285 | case elfcpp::R_386_GLOB_DAT: | |
2286 | case elfcpp::R_386_JUMP_SLOT: | |
2287 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2288 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2289 | case elfcpp::R_386_TLS_TPOFF: |
2290 | case elfcpp::R_386_TLS_DTPMOD32: | |
2291 | case elfcpp::R_386_TLS_DTPOFF32: | |
2292 | case elfcpp::R_386_TLS_TPOFF32: | |
2293 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2294 | gold_error(_("%s: unexpected reloc %u in object file"), |
2295 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2296 | break; |
2297 | ||
d61c17ea ILT |
2298 | // These are initial tls relocs, which are expected when |
2299 | // linking. | |
56622147 ILT |
2300 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2301 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2302 | case elfcpp::R_386_TLS_DESC_CALL: | |
2303 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2304 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2305 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2306 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2307 | case elfcpp::R_386_TLS_GOTIE: |
2308 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2309 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2310 | { |
7e1edb90 | 2311 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 | 2312 | const tls::Tls_optimization optimized_type |
2e702c99 | 2313 | = Target_i386::optimize_tls_reloc(is_final, r_type); |
a3ad94ed ILT |
2314 | switch (r_type) |
2315 | { | |
56622147 | 2316 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2317 | if (optimized_type == tls::TLSOPT_NONE) |
2318 | { | |
2e702c99 RM |
2319 | // Create a pair of GOT entries for the module index and |
2320 | // dtv-relative offset. | |
2321 | Output_data_got<32, false>* got | |
2322 | = target->got_section(symtab, layout); | |
2323 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
2324 | target->rel_dyn_section(layout), | |
2325 | elfcpp::R_386_TLS_DTPMOD32, | |
2326 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2327 | } |
2328 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2329 | { | |
2e702c99 RM |
2330 | // Create a GOT entry for the tp-relative offset. |
2331 | Output_data_got<32, false>* got | |
2332 | = target->got_section(symtab, layout); | |
2333 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2334 | target->rel_dyn_section(layout), | |
2335 | elfcpp::R_386_TLS_TPOFF); | |
07f397ab ILT |
2336 | } |
2337 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2338 | unsupported_reloc_global(object, r_type, gsym); | |
2339 | break; | |
2340 | ||
56622147 | 2341 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2342 | target->define_tls_base_symbol(symtab, layout); |
2e702c99 RM |
2343 | if (optimized_type == tls::TLSOPT_NONE) |
2344 | { | |
2345 | // Create a double GOT entry with an R_386_TLS_DESC | |
2346 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2347 | // lazily, so the GOT entry needs to be in an area in | |
2348 | // .got.plt, not .got. Call got_section to make sure | |
2349 | // the section has been created. | |
a8df5856 | 2350 | target->got_section(symtab, layout); |
2e702c99 | 2351 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); |
e291e7b9 | 2352 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2e702c99 RM |
2353 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2354 | elfcpp::R_386_TLS_DESC, 0); | |
2355 | } | |
2356 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2357 | { | |
2358 | // Create a GOT entry for the tp-relative offset. | |
2359 | Output_data_got<32, false>* got | |
2360 | = target->got_section(symtab, layout); | |
2361 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2362 | target->rel_dyn_section(layout), | |
2363 | elfcpp::R_386_TLS_TPOFF); | |
2364 | } | |
2365 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2366 | unsupported_reloc_global(object, r_type, gsym); | |
c2b45e22 CC |
2367 | break; |
2368 | ||
2369 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2370 | break; |
2371 | ||
56622147 | 2372 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2373 | if (optimized_type == tls::TLSOPT_NONE) |
2374 | { | |
2e702c99 RM |
2375 | // Create a GOT entry for the module index. |
2376 | target->got_mod_index_entry(symtab, layout, object); | |
07f397ab ILT |
2377 | } |
2378 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2379 | unsupported_reloc_global(object, r_type, gsym); |
2380 | break; | |
2381 | ||
56622147 | 2382 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2383 | break; |
2384 | ||
56622147 ILT |
2385 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2386 | case elfcpp::R_386_TLS_IE_32: | |
2387 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2388 | layout->set_has_static_tls(); |
07f397ab ILT |
2389 | if (optimized_type == tls::TLSOPT_NONE) |
2390 | { | |
2e702c99 RM |
2391 | // For the R_386_TLS_IE relocation, we need to create a |
2392 | // dynamic relocation when building a shared library. | |
2393 | if (r_type == elfcpp::R_386_TLS_IE | |
2394 | && parameters->options().shared()) | |
2395 | { | |
2396 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2397 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2398 | output_section, object, | |
2399 | data_shndx, | |
2400 | reloc.get_r_offset()); | |
2401 | } | |
2402 | // Create a GOT entry for the tp-relative offset. | |
2403 | Output_data_got<32, false>* got | |
2404 | = target->got_section(symtab, layout); | |
2405 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2406 | ? elfcpp::R_386_TLS_TPOFF32 | |
2407 | : elfcpp::R_386_TLS_TPOFF); | |
2408 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2409 | ? GOT_TYPE_TLS_OFFSET | |
2410 | : GOT_TYPE_TLS_NOFFSET); | |
2411 | got->add_global_with_rel(gsym, got_type, | |
2412 | target->rel_dyn_section(layout), | |
2413 | dyn_r_type); | |
07f397ab ILT |
2414 | } |
2415 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2416 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2417 | break; |
af6359d5 | 2418 | |
56622147 ILT |
2419 | case elfcpp::R_386_TLS_LE: // Local-exec |
2420 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2421 | layout->set_has_static_tls(); |
8851ecca | 2422 | if (parameters->options().shared()) |
7bf1f802 | 2423 | { |
2e702c99 RM |
2424 | // We need to create a dynamic relocation. |
2425 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2426 | ? elfcpp::R_386_TLS_TPOFF32 | |
2427 | : elfcpp::R_386_TLS_TPOFF); | |
2428 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2429 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2430 | data_shndx, reloc.get_r_offset()); | |
7bf1f802 | 2431 | } |
56622147 ILT |
2432 | break; |
2433 | ||
af6359d5 ILT |
2434 | default: |
2435 | gold_unreachable(); | |
a3ad94ed ILT |
2436 | } |
2437 | } | |
92e059d8 ILT |
2438 | break; |
2439 | ||
92e059d8 ILT |
2440 | case elfcpp::R_386_32PLT: |
2441 | case elfcpp::R_386_TLS_GD_32: | |
2442 | case elfcpp::R_386_TLS_GD_PUSH: | |
2443 | case elfcpp::R_386_TLS_GD_CALL: | |
2444 | case elfcpp::R_386_TLS_GD_POP: | |
2445 | case elfcpp::R_386_TLS_LDM_32: | |
2446 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2447 | case elfcpp::R_386_TLS_LDM_CALL: | |
2448 | case elfcpp::R_386_TLS_LDM_POP: | |
2449 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2450 | default: | |
af6359d5 | 2451 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2452 | break; |
2453 | } | |
2454 | } | |
2455 | ||
6d03d481 ST |
2456 | // Process relocations for gc. |
2457 | ||
2458 | void | |
ad0f2072 | 2459 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
2460 | Layout* layout, |
2461 | Sized_relobj_file<32, false>* object, | |
2462 | unsigned int data_shndx, | |
2463 | unsigned int, | |
2464 | const unsigned char* prelocs, | |
2465 | size_t reloc_count, | |
2466 | Output_section* output_section, | |
2467 | bool needs_special_offset_handling, | |
2468 | size_t local_symbol_count, | |
2469 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
2470 | { |
2471 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
2e702c99 RM |
2472 | Target_i386::Scan, |
2473 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2474 | symtab, |
2475 | layout, | |
2476 | this, | |
2477 | object, | |
2478 | data_shndx, | |
2479 | prelocs, | |
2480 | reloc_count, | |
2481 | output_section, | |
2482 | needs_special_offset_handling, | |
2483 | local_symbol_count, | |
2484 | plocal_symbols); | |
2485 | } | |
2486 | ||
92e059d8 ILT |
2487 | // Scan relocations for a section. |
2488 | ||
2489 | void | |
ad0f2072 | 2490 | Target_i386::scan_relocs(Symbol_table* symtab, |
2e702c99 RM |
2491 | Layout* layout, |
2492 | Sized_relobj_file<32, false>* object, | |
2493 | unsigned int data_shndx, | |
2494 | unsigned int sh_type, | |
2495 | const unsigned char* prelocs, | |
2496 | size_t reloc_count, | |
2497 | Output_section* output_section, | |
2498 | bool needs_special_offset_handling, | |
2499 | size_t local_symbol_count, | |
2500 | const unsigned char* plocal_symbols) | |
92e059d8 ILT |
2501 | { |
2502 | if (sh_type == elfcpp::SHT_RELA) | |
2503 | { | |
75f2446e ILT |
2504 | gold_error(_("%s: unsupported RELA reloc section"), |
2505 | object->name().c_str()); | |
2506 | return; | |
92e059d8 ILT |
2507 | } |
2508 | ||
ead1e424 ILT |
2509 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2510 | Target_i386::Scan>( | |
92e059d8 | 2511 | symtab, |
ead1e424 ILT |
2512 | layout, |
2513 | this, | |
92e059d8 | 2514 | object, |
a3ad94ed | 2515 | data_shndx, |
92e059d8 ILT |
2516 | prelocs, |
2517 | reloc_count, | |
730cdc88 ILT |
2518 | output_section, |
2519 | needs_special_offset_handling, | |
92e059d8 | 2520 | local_symbol_count, |
730cdc88 | 2521 | plocal_symbols); |
92e059d8 ILT |
2522 | } |
2523 | ||
16649710 | 2524 | // Finalize the sections. |
5a6f7e2d ILT |
2525 | |
2526 | void | |
f59f41f3 DK |
2527 | Target_i386::do_finalize_sections( |
2528 | Layout* layout, | |
2529 | const Input_objects*, | |
e785ec03 | 2530 | Symbol_table* symtab) |
5a6f7e2d | 2531 | { |
ea715a34 ILT |
2532 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2533 | ? NULL | |
2534 | : this->plt_->rel_plt()); | |
2535 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2536 | this->rel_dyn_, true, false); |
16649710 ILT |
2537 | |
2538 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2539 | // relocs. | |
12c0daef ILT |
2540 | if (this->copy_relocs_.any_saved_relocs()) |
2541 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2542 | |
2543 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2544 | // the .got.plt section. | |
2545 | Symbol* sym = this->global_offset_table_; | |
2546 | if (sym != NULL) | |
2547 | { | |
2548 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2549 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2550 | } | |
28a13fec | 2551 | |
67181c72 ILT |
2552 | if (parameters->doing_static_link() |
2553 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2554 | { |
2555 | // If linking statically, make sure that the __rel_iplt symbols | |
2556 | // were defined if necessary, even if we didn't create a PLT. | |
2557 | static const Define_symbol_in_segment syms[] = | |
2558 | { | |
2559 | { | |
2560 | "__rel_iplt_start", // name | |
2561 | elfcpp::PT_LOAD, // segment_type | |
2562 | elfcpp::PF_W, // segment_flags_set | |
2563 | elfcpp::PF(0), // segment_flags_clear | |
2564 | 0, // value | |
2565 | 0, // size | |
2566 | elfcpp::STT_NOTYPE, // type | |
2567 | elfcpp::STB_GLOBAL, // binding | |
2568 | elfcpp::STV_HIDDEN, // visibility | |
2569 | 0, // nonvis | |
2570 | Symbol::SEGMENT_START, // offset_from_base | |
2571 | true // only_if_ref | |
2572 | }, | |
2573 | { | |
2574 | "__rel_iplt_end", // name | |
2575 | elfcpp::PT_LOAD, // segment_type | |
2576 | elfcpp::PF_W, // segment_flags_set | |
2577 | elfcpp::PF(0), // segment_flags_clear | |
2578 | 0, // value | |
2579 | 0, // size | |
2580 | elfcpp::STT_NOTYPE, // type | |
2581 | elfcpp::STB_GLOBAL, // binding | |
2582 | elfcpp::STV_HIDDEN, // visibility | |
2583 | 0, // nonvis | |
2584 | Symbol::SEGMENT_START, // offset_from_base | |
2585 | true // only_if_ref | |
2586 | } | |
2587 | }; | |
2588 | ||
2589 | symtab->define_symbols(layout, 2, syms, | |
2590 | layout->script_options()->saw_sections_clause()); | |
2591 | } | |
5a6f7e2d ILT |
2592 | } |
2593 | ||
86849f1f ILT |
2594 | // Return whether a direct absolute static relocation needs to be applied. |
2595 | // In cases where Scan::local() or Scan::global() has created | |
2596 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2597 | // of the relocation is carried in the data, and we must not | |
2598 | // apply the static relocation. | |
2599 | ||
2600 | inline bool | |
2601 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
2e702c99 RM |
2602 | unsigned int r_type, |
2603 | bool is_32bit, | |
031cdbed | 2604 | Output_section* output_section) |
86849f1f | 2605 | { |
031cdbed ILT |
2606 | // If the output section is not allocated, then we didn't call |
2607 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2608 | // the reloc here. | |
2609 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2610 | return true; | |
2611 | ||
95a2c8d6 RS |
2612 | int ref_flags = Scan::get_reference_flags(r_type); |
2613 | ||
d61c6bd4 ILT |
2614 | // For local symbols, we will have created a non-RELATIVE dynamic |
2615 | // relocation only if (a) the output is position independent, | |
2616 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2617 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2618 | if (gsym == NULL) |
8851ecca | 2619 | return !(parameters->options().output_is_position_independent() |
2e702c99 RM |
2620 | && (ref_flags & Symbol::ABSOLUTE_REF) |
2621 | && !is_32bit); | |
86849f1f | 2622 | |
0700cf32 ILT |
2623 | // For global symbols, we use the same helper routines used in the |
2624 | // scan pass. If we did not create a dynamic relocation, or if we | |
2625 | // created a RELATIVE dynamic relocation, we should apply the static | |
2626 | // relocation. | |
2627 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2628 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2e702c99 RM |
2629 | && gsym->can_use_relative_reloc(ref_flags |
2630 | & Symbol::FUNCTION_CALL); | |
0700cf32 | 2631 | return !has_dyn || is_rel; |
86849f1f ILT |
2632 | } |
2633 | ||
61ba1cf9 ILT |
2634 | // Perform a relocation. |
2635 | ||
ead1e424 | 2636 | inline bool |
92e059d8 | 2637 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
2e702c99 RM |
2638 | Target_i386* target, |
2639 | Output_section* output_section, | |
2640 | size_t relnum, | |
2641 | const elfcpp::Rel<32, false>& rel, | |
2642 | unsigned int r_type, | |
2643 | const Sized_symbol<32>* gsym, | |
2644 | const Symbol_value<32>* psymval, | |
2645 | unsigned char* view, | |
2646 | elfcpp::Elf_types<32>::Elf_Addr address, | |
2647 | section_size_type view_size) | |
61ba1cf9 | 2648 | { |
ead1e424 ILT |
2649 | if (this->skip_call_tls_get_addr_) |
2650 | { | |
5efc7cd2 | 2651 | if ((r_type != elfcpp::R_386_PLT32 |
2e702c99 | 2652 | && r_type != elfcpp::R_386_PC32) |
ead1e424 ILT |
2653 | || gsym == NULL |
2654 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2655 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2656 | _("missing expected TLS relocation")); | |
2657 | else | |
ead1e424 | 2658 | { |
75f2446e ILT |
2659 | this->skip_call_tls_get_addr_ = false; |
2660 | return false; | |
ead1e424 | 2661 | } |
ead1e424 ILT |
2662 | } |
2663 | ||
6fa2a40b | 2664 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2665 | |
a3ad94ed | 2666 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2667 | Symbol_value<32> symval; |
436ca963 | 2668 | if (gsym != NULL |
7223e9ca ILT |
2669 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2670 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2671 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2672 | && gsym->can_use_relative_reloc(false) |
2673 | && !gsym->is_from_dynobj() | |
2674 | && !gsym->is_undefined() | |
2675 | && !gsym->is_preemptible()) | |
2676 | { | |
2677 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2678 | // want to use the real value of the symbol, not the PLT offset. | |
2679 | } | |
2680 | else if (gsym != NULL | |
95a2c8d6 | 2681 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2682 | { |
19fec8c1 | 2683 | symval.set_output_value(target->plt_address_for_global(gsym)); |
b8e6aad9 | 2684 | psymval = &symval; |
a3ad94ed | 2685 | } |
7223e9ca ILT |
2686 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2687 | { | |
2688 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2689 | if (object->local_has_plt_offset(r_sym)) | |
2690 | { | |
19fec8c1 | 2691 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
2692 | psymval = &symval; |
2693 | } | |
2694 | } | |
b8e6aad9 | 2695 | |
1b64748b | 2696 | // Get the GOT offset if needed. |
96f2030e ILT |
2697 | // The GOT pointer points to the end of the GOT section. |
2698 | // We need to subtract the size of the GOT section to get | |
2699 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2700 | bool have_got_offset = false; |
2701 | unsigned int got_offset = 0; | |
2702 | switch (r_type) | |
2703 | { | |
2704 | case elfcpp::R_386_GOT32: | |
2705 | if (gsym != NULL) | |
2e702c99 RM |
2706 | { |
2707 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
2708 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2709 | - target->got_size()); | |
2710 | } | |
1b64748b | 2711 | else |
2e702c99 RM |
2712 | { |
2713 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2714 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2715 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2716 | - target->got_size()); | |
2717 | } | |
1b64748b ILT |
2718 | have_got_offset = true; |
2719 | break; | |
2720 | ||
2721 | default: | |
2722 | break; | |
2723 | } | |
2724 | ||
61ba1cf9 ILT |
2725 | switch (r_type) |
2726 | { | |
2727 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2728 | case elfcpp::R_386_GNU_VTINHERIT: |
2729 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2730 | break; |
2731 | ||
2732 | case elfcpp::R_386_32: | |
95a2c8d6 | 2733 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2734 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2735 | break; |
2736 | ||
2737 | case elfcpp::R_386_PC32: | |
95a2c8d6 | 2738 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2e702c99 | 2739 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
92e059d8 ILT |
2740 | break; |
2741 | ||
2742 | case elfcpp::R_386_16: | |
95a2c8d6 | 2743 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2744 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2745 | break; |
2746 | ||
2747 | case elfcpp::R_386_PC16: | |
95a2c8d6 | 2748 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2749 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
61ba1cf9 ILT |
2750 | break; |
2751 | ||
92e059d8 | 2752 | case elfcpp::R_386_8: |
95a2c8d6 | 2753 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2754 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2755 | break; |
2756 | ||
2757 | case elfcpp::R_386_PC8: | |
95a2c8d6 | 2758 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2e702c99 | 2759 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
92e059d8 ILT |
2760 | break; |
2761 | ||
ead1e424 | 2762 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2763 | gold_assert(gsym == NULL |
2764 | || gsym->has_plt_offset() | |
99f8faca ILT |
2765 | || gsym->final_value_is_known() |
2766 | || (gsym->is_defined() | |
2767 | && !gsym->is_from_dynobj() | |
2768 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2769 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2770 | break; |
2771 | ||
2772 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2773 | gold_assert(have_got_offset); |
2774 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2775 | break; |
2776 | ||
2777 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2778 | { |
2779 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2780 | value = (psymval->value(object, 0) | |
96f2030e | 2781 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2782 | Relocate_functions<32, false>::rel32(view, value); |
2783 | } | |
ead1e424 ILT |
2784 | break; |
2785 | ||
2786 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2787 | { |
2788 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2789 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2790 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2791 | } | |
ead1e424 ILT |
2792 | break; |
2793 | ||
92e059d8 ILT |
2794 | case elfcpp::R_386_COPY: |
2795 | case elfcpp::R_386_GLOB_DAT: | |
2796 | case elfcpp::R_386_JUMP_SLOT: | |
2797 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2798 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2799 | // These are outstanding tls relocs, which are unexpected when |
2800 | // linking. | |
92e059d8 ILT |
2801 | case elfcpp::R_386_TLS_TPOFF: |
2802 | case elfcpp::R_386_TLS_DTPMOD32: | |
2803 | case elfcpp::R_386_TLS_DTPOFF32: | |
2804 | case elfcpp::R_386_TLS_TPOFF32: | |
2805 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2806 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2807 | _("unexpected reloc %u in object file"), | |
2808 | r_type); | |
92e059d8 ILT |
2809 | break; |
2810 | ||
d61c17ea ILT |
2811 | // These are initial tls relocs, which are expected when |
2812 | // linking. | |
56622147 ILT |
2813 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2814 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2815 | case elfcpp::R_386_TLS_DESC_CALL: | |
2816 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2817 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2818 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2819 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2820 | case elfcpp::R_386_TLS_GOTIE: |
2821 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2822 | case elfcpp::R_386_TLS_LE_32: |
07f397ab | 2823 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2e702c99 | 2824 | view, address, view_size); |
92e059d8 ILT |
2825 | break; |
2826 | ||
92e059d8 ILT |
2827 | case elfcpp::R_386_32PLT: |
2828 | case elfcpp::R_386_TLS_GD_32: | |
2829 | case elfcpp::R_386_TLS_GD_PUSH: | |
2830 | case elfcpp::R_386_TLS_GD_CALL: | |
2831 | case elfcpp::R_386_TLS_GD_POP: | |
2832 | case elfcpp::R_386_TLS_LDM_32: | |
2833 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2834 | case elfcpp::R_386_TLS_LDM_CALL: | |
2835 | case elfcpp::R_386_TLS_LDM_POP: | |
2836 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2837 | default: |
75f2446e ILT |
2838 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2839 | _("unsupported reloc %u"), | |
2840 | r_type); | |
92e059d8 ILT |
2841 | break; |
2842 | } | |
ead1e424 ILT |
2843 | |
2844 | return true; | |
92e059d8 ILT |
2845 | } |
2846 | ||
2847 | // Perform a TLS relocation. | |
2848 | ||
2849 | inline void | |
2850 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
2e702c99 | 2851 | Target_i386* target, |
92e059d8 ILT |
2852 | size_t relnum, |
2853 | const elfcpp::Rel<32, false>& rel, | |
2854 | unsigned int r_type, | |
c06b7b0b | 2855 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2856 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2857 | unsigned char* view, |
2858 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2859 | section_size_type view_size) |
92e059d8 ILT |
2860 | { |
2861 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2862 | |
6fa2a40b | 2863 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2864 | |
2865 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2866 | |
b3705d2a ILT |
2867 | const bool is_final = (gsym == NULL |
2868 | ? !parameters->options().shared() | |
2869 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2870 | const tls::Tls_optimization optimized_type |
2871 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2872 | switch (r_type) |
2873 | { | |
56622147 | 2874 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2875 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2876 | { |
62855347 ILT |
2877 | if (tls_segment == NULL) |
2878 | { | |
191f1a2d ILT |
2879 | gold_assert(parameters->errors()->error_count() > 0 |
2880 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2881 | return; |
2882 | } | |
56622147 ILT |
2883 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2884 | rel, r_type, value, view, | |
2885 | view_size); | |
92e059d8 ILT |
2886 | break; |
2887 | } | |
07f397ab | 2888 | else |
2e702c99 RM |
2889 | { |
2890 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2891 | ? GOT_TYPE_TLS_NOFFSET | |
2892 | : GOT_TYPE_TLS_PAIR); | |
2893 | unsigned int got_offset; | |
2894 | if (gsym != NULL) | |
2895 | { | |
2896 | gold_assert(gsym->has_got_offset(got_type)); | |
2897 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2898 | } | |
2899 | else | |
2900 | { | |
2901 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2902 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2903 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab | 2904 | - target->got_size()); |
2e702c99 RM |
2905 | } |
2906 | if (optimized_type == tls::TLSOPT_TO_IE) | |
07f397ab | 2907 | { |
7bf1f802 | 2908 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
2909 | got_offset, view, view_size); |
2910 | break; | |
2911 | } | |
2912 | else if (optimized_type == tls::TLSOPT_NONE) | |
2913 | { | |
2914 | // Relocate the field with the offset of the pair of GOT | |
2915 | // entries. | |
2916 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2917 | break; | |
07f397ab | 2918 | } |
2e702c99 | 2919 | } |
75f2446e ILT |
2920 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2921 | _("unsupported reloc %u"), | |
2922 | r_type); | |
92e059d8 ILT |
2923 | break; |
2924 | ||
56622147 ILT |
2925 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2926 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2927 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 | 2928 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 2929 | { |
62855347 ILT |
2930 | if (tls_segment == NULL) |
2931 | { | |
191f1a2d ILT |
2932 | gold_assert(parameters->errors()->error_count() > 0 |
2933 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2934 | return; |
2935 | } | |
c2b45e22 | 2936 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
2937 | rel, r_type, value, view, |
2938 | view_size); | |
c2b45e22 | 2939 | break; |
2e702c99 | 2940 | } |
c2b45e22 | 2941 | else |
2e702c99 RM |
2942 | { |
2943 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2944 | ? GOT_TYPE_TLS_NOFFSET | |
2945 | : GOT_TYPE_TLS_DESC); | |
2946 | unsigned int got_offset = 0; | |
a8df5856 ILT |
2947 | if (r_type == elfcpp::R_386_TLS_GOTDESC |
2948 | && optimized_type == tls::TLSOPT_NONE) | |
2949 | { | |
2950 | // We created GOT entries in the .got.tlsdesc portion of | |
2951 | // the .got.plt section, but the offset stored in the | |
2952 | // symbol is the offset within .got.tlsdesc. | |
2953 | got_offset = (target->got_size() | |
2954 | + target->got_plt_section()->data_size()); | |
2955 | } | |
2e702c99 RM |
2956 | if (gsym != NULL) |
2957 | { | |
2958 | gold_assert(gsym->has_got_offset(got_type)); | |
2959 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
2960 | } | |
2961 | else | |
2962 | { | |
2963 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2964 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2965 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 2966 | - target->got_size()); |
2e702c99 RM |
2967 | } |
2968 | if (optimized_type == tls::TLSOPT_TO_IE) | |
c2b45e22 | 2969 | { |
62855347 ILT |
2970 | if (tls_segment == NULL) |
2971 | { | |
191f1a2d ILT |
2972 | gold_assert(parameters->errors()->error_count() > 0 |
2973 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2974 | return; |
2975 | } | |
c2b45e22 | 2976 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2e702c99 RM |
2977 | got_offset, view, view_size); |
2978 | break; | |
2979 | } | |
2980 | else if (optimized_type == tls::TLSOPT_NONE) | |
2981 | { | |
2982 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2983 | { | |
2984 | // Relocate the field with the offset of the pair of GOT | |
2985 | // entries. | |
2986 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2987 | } | |
2988 | break; | |
c2b45e22 | 2989 | } |
2e702c99 | 2990 | } |
75f2446e ILT |
2991 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2992 | _("unsupported reloc %u"), | |
2993 | r_type); | |
ead1e424 ILT |
2994 | break; |
2995 | ||
56622147 | 2996 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2997 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2998 | { | |
75f2446e ILT |
2999 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3000 | _("both SUN and GNU model " | |
3001 | "TLS relocations")); | |
3002 | break; | |
46cf9fa2 ILT |
3003 | } |
3004 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 3005 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 3006 | { |
62855347 ILT |
3007 | if (tls_segment == NULL) |
3008 | { | |
191f1a2d ILT |
3009 | gold_assert(parameters->errors()->error_count() > 0 |
3010 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3011 | return; |
3012 | } | |
46cf9fa2 ILT |
3013 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
3014 | value, view, view_size); | |
3015 | break; | |
3016 | } | |
07f397ab | 3017 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3018 | { |
3019 | // Relocate the field with the offset of the GOT entry for | |
3020 | // the module index. | |
3021 | unsigned int got_offset; | |
3022 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
94c4710f | 3023 | - target->got_size()); |
2e702c99 RM |
3024 | Relocate_functions<32, false>::rel32(view, got_offset); |
3025 | break; | |
3026 | } | |
75f2446e ILT |
3027 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3028 | _("unsupported reloc %u"), | |
3029 | r_type); | |
46cf9fa2 ILT |
3030 | break; |
3031 | ||
56622147 | 3032 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 3033 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 3034 | { |
82bb573a ILT |
3035 | // This reloc can appear in debugging sections, in which |
3036 | // case we must not convert to local-exec. We decide what | |
3037 | // to do based on whether the section is marked as | |
3038 | // containing executable code. That is what the GNU linker | |
3039 | // does as well. | |
3040 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
3041 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 3042 | { |
62855347 ILT |
3043 | if (tls_segment == NULL) |
3044 | { | |
191f1a2d ILT |
3045 | gold_assert(parameters->errors()->error_count() > 0 |
3046 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3047 | return; |
3048 | } | |
d6f22b98 ILT |
3049 | value -= tls_segment->memsz(); |
3050 | } | |
e8a9fcda | 3051 | } |
46cf9fa2 ILT |
3052 | Relocate_functions<32, false>::rel32(view, value); |
3053 | break; | |
3054 | ||
56622147 ILT |
3055 | case elfcpp::R_386_TLS_IE: // Initial-exec |
3056 | case elfcpp::R_386_TLS_GOTIE: | |
3057 | case elfcpp::R_386_TLS_IE_32: | |
3058 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3059 | { | |
62855347 ILT |
3060 | if (tls_segment == NULL) |
3061 | { | |
191f1a2d ILT |
3062 | gold_assert(parameters->errors()->error_count() > 0 |
3063 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3064 | return; |
3065 | } | |
56622147 ILT |
3066 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
3067 | rel, r_type, value, view, | |
3068 | view_size); | |
3069 | break; | |
3070 | } | |
07f397ab | 3071 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3072 | { |
3073 | // Relocate the field with the offset of the GOT entry for | |
3074 | // the tp-relative offset of the symbol. | |
c2b45e22 | 3075 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2e702c99 RM |
3076 | ? GOT_TYPE_TLS_OFFSET |
3077 | : GOT_TYPE_TLS_NOFFSET); | |
3078 | unsigned int got_offset; | |
3079 | if (gsym != NULL) | |
3080 | { | |
3081 | gold_assert(gsym->has_got_offset(got_type)); | |
3082 | got_offset = gsym->got_offset(got_type); | |
3083 | } | |
3084 | else | |
3085 | { | |
3086 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3087 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3088 | got_offset = object->local_got_offset(r_sym, got_type); | |
3089 | } | |
3090 | // For the R_386_TLS_IE relocation, we need to apply the | |
3091 | // absolute address of the GOT entry. | |
3092 | if (r_type == elfcpp::R_386_TLS_IE) | |
3093 | got_offset += target->got_plt_section()->address(); | |
3094 | // All GOT offsets are relative to the end of the GOT. | |
3095 | got_offset -= target->got_size(); | |
3096 | Relocate_functions<32, false>::rel32(view, got_offset); | |
3097 | break; | |
3098 | } | |
75f2446e ILT |
3099 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
3100 | _("unsupported reloc %u"), | |
3101 | r_type); | |
92e059d8 | 3102 | break; |
92e059d8 | 3103 | |
56622147 | 3104 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
3105 | // If we're creating a shared library, a dynamic relocation will |
3106 | // have been created for this location, so do not apply it now. | |
8851ecca | 3107 | if (!parameters->options().shared()) |
2e702c99 | 3108 | { |
62855347 ILT |
3109 | if (tls_segment == NULL) |
3110 | { | |
191f1a2d ILT |
3111 | gold_assert(parameters->errors()->error_count() > 0 |
3112 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3113 | return; |
3114 | } | |
2e702c99 RM |
3115 | value -= tls_segment->memsz(); |
3116 | Relocate_functions<32, false>::rel32(view, value); | |
3117 | } | |
56622147 | 3118 | break; |
92e059d8 | 3119 | |
56622147 | 3120 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
3121 | // If we're creating a shared library, a dynamic relocation will |
3122 | // have been created for this location, so do not apply it now. | |
8851ecca | 3123 | if (!parameters->options().shared()) |
2e702c99 | 3124 | { |
62855347 ILT |
3125 | if (tls_segment == NULL) |
3126 | { | |
191f1a2d ILT |
3127 | gold_assert(parameters->errors()->error_count() > 0 |
3128 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3129 | return; |
3130 | } | |
2e702c99 RM |
3131 | value = tls_segment->memsz() - value; |
3132 | Relocate_functions<32, false>::rel32(view, value); | |
3133 | } | |
56622147 | 3134 | break; |
92e059d8 | 3135 | } |
92e059d8 ILT |
3136 | } |
3137 | ||
e041f13d | 3138 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
3139 | // Local-Exec. |
3140 | ||
3141 | inline void | |
3142 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
3143 | size_t relnum, | |
3144 | Output_segment* tls_segment, | |
3145 | const elfcpp::Rel<32, false>& rel, | |
3146 | unsigned int, | |
3147 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3148 | unsigned char* view, | |
fe8718a4 | 3149 | section_size_type view_size) |
ead1e424 ILT |
3150 | { |
3151 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 3152 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
3153 | // leal foo(%reg),%eax; call ___tls_get_addr |
3154 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
3155 | ||
af6359d5 ILT |
3156 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3157 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
3158 | |
3159 | unsigned char op1 = view[-1]; | |
3160 | unsigned char op2 = view[-2]; | |
3161 | ||
af6359d5 | 3162 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3163 | op2 == 0x8d || op2 == 0x04); |
af6359d5 | 3164 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
ead1e424 ILT |
3165 | |
3166 | int roff = 5; | |
3167 | ||
3168 | if (op2 == 0x04) | |
3169 | { | |
af6359d5 ILT |
3170 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
3171 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3172 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3173 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
ead1e424 ILT |
3174 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
3175 | } | |
3176 | else | |
3177 | { | |
af6359d5 | 3178 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3179 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3180 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3181 | && view[9] == 0x90) |
ead1e424 ILT |
3182 | { |
3183 | // There is a trailing nop. Use the size byte subl. | |
3184 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3185 | roff = 6; | |
3186 | } | |
3187 | else | |
3188 | { | |
3189 | // Use the five byte subl. | |
3190 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3191 | } | |
3192 | } | |
3193 | ||
7bf1f802 | 3194 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3195 | Relocate_functions<32, false>::rel32(view + roff, value); |
3196 | ||
3197 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3198 | // We can skip it. | |
3199 | this->skip_call_tls_get_addr_ = true; | |
3200 | } | |
3201 | ||
7bf1f802 | 3202 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3203 | // Initial-Exec. |
3204 | ||
3205 | inline void | |
3206 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3207 | size_t relnum, | |
c2b45e22 | 3208 | Output_segment*, |
07f397ab ILT |
3209 | const elfcpp::Rel<32, false>& rel, |
3210 | unsigned int, | |
3211 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3212 | unsigned char* view, | |
fe8718a4 | 3213 | section_size_type view_size) |
07f397ab ILT |
3214 | { |
3215 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3216 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
3217 | ||
3218 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3219 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3220 | ||
3221 | unsigned char op1 = view[-1]; | |
3222 | unsigned char op2 = view[-2]; | |
3223 | ||
3224 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3225 | op2 == 0x8d || op2 == 0x04); |
07f397ab ILT |
3226 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
3227 | ||
3228 | int roff = 5; | |
3229 | ||
c2b45e22 CC |
3230 | // FIXME: For now, support only the first (SIB) form. |
3231 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
3232 | |
3233 | if (op2 == 0x04) | |
3234 | { | |
3235 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3236 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3237 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3238 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); |
07f397ab ILT |
3239 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); |
3240 | } | |
3241 | else | |
3242 | { | |
3243 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3244 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); |
fe8718a4 | 3245 | if (rel.get_r_offset() + 9 < view_size |
2e702c99 | 3246 | && view[9] == 0x90) |
07f397ab | 3247 | { |
2e702c99 | 3248 | // FIXME: This is not the right instruction sequence. |
07f397ab ILT |
3249 | // There is a trailing nop. Use the size byte subl. |
3250 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3251 | roff = 6; | |
3252 | } | |
3253 | else | |
3254 | { | |
2e702c99 | 3255 | // FIXME: This is not the right instruction sequence. |
07f397ab ILT |
3256 | // Use the five byte subl. |
3257 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3258 | } | |
3259 | } | |
3260 | ||
07f397ab ILT |
3261 | Relocate_functions<32, false>::rel32(view + roff, value); |
3262 | ||
3263 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3264 | // We can skip it. | |
3265 | this->skip_call_tls_get_addr_ = true; | |
3266 | } | |
3267 | ||
c2b45e22 CC |
3268 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3269 | // General-Dynamic to a Local-Exec. | |
3270 | ||
3271 | inline void | |
3272 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3273 | const Relocate_info<32, false>* relinfo, | |
3274 | size_t relnum, | |
3275 | Output_segment* tls_segment, | |
3276 | const elfcpp::Rel<32, false>& rel, | |
3277 | unsigned int r_type, | |
3278 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3279 | unsigned char* view, | |
3280 | section_size_type view_size) | |
3281 | { | |
3282 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3283 | { | |
3284 | // leal foo@TLSDESC(%ebx), %eax | |
3285 | // ==> leal foo@NTPOFF, %eax | |
3286 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3287 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3288 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3289 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3290 | view[-1] = 0x05; |
3291 | value -= tls_segment->memsz(); | |
3292 | Relocate_functions<32, false>::rel32(view, value); | |
3293 | } | |
3294 | else | |
3295 | { | |
3296 | // call *foo@TLSCALL(%eax) | |
3297 | // ==> nop; nop | |
3298 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3299 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3300 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3301 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3302 | view[0] = 0x66; |
3303 | view[1] = 0x90; | |
3304 | } | |
3305 | } | |
3306 | ||
3307 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3308 | // General-Dynamic to an Initial-Exec. | |
3309 | ||
3310 | inline void | |
3311 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3312 | const Relocate_info<32, false>* relinfo, | |
3313 | size_t relnum, | |
3314 | Output_segment*, | |
3315 | const elfcpp::Rel<32, false>& rel, | |
3316 | unsigned int r_type, | |
3317 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3318 | unsigned char* view, | |
3319 | section_size_type view_size) | |
3320 | { | |
3321 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3322 | { | |
3323 | // leal foo@TLSDESC(%ebx), %eax | |
3324 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3325 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3326 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3327 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3328 | view[-2] == 0x8d && view[-1] == 0x83); |
c2b45e22 CC |
3329 | view[-2] = 0x8b; |
3330 | Relocate_functions<32, false>::rel32(view, value); | |
3331 | } | |
3332 | else | |
3333 | { | |
3334 | // call *foo@TLSCALL(%eax) | |
3335 | // ==> nop; nop | |
3336 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3337 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3338 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3339 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3340 | view[0] = 0x66; |
3341 | view[1] = 0x90; | |
3342 | } | |
3343 | } | |
3344 | ||
46cf9fa2 ILT |
3345 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3346 | // Local-Exec. | |
3347 | ||
3348 | inline void | |
3349 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3350 | size_t relnum, | |
3351 | Output_segment*, | |
3352 | const elfcpp::Rel<32, false>& rel, | |
3353 | unsigned int, | |
3354 | elfcpp::Elf_types<32>::Elf_Addr, | |
3355 | unsigned char* view, | |
fe8718a4 | 3356 | section_size_type view_size) |
46cf9fa2 ILT |
3357 | { |
3358 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3359 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3360 | ||
af6359d5 ILT |
3361 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3362 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3363 | |
3364 | // FIXME: Does this test really always pass? | |
af6359d5 | 3365 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2e702c99 | 3366 | view[-2] == 0x8d && view[-1] == 0x83); |
46cf9fa2 | 3367 | |
af6359d5 | 3368 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3369 | |
3370 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3371 | ||
3372 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3373 | // We can skip it. | |
3374 | this->skip_call_tls_get_addr_ = true; | |
3375 | } | |
3376 | ||
56622147 ILT |
3377 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3378 | // Local-Exec. | |
3379 | ||
3380 | inline void | |
3381 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3382 | size_t relnum, | |
3383 | Output_segment* tls_segment, | |
3384 | const elfcpp::Rel<32, false>& rel, | |
3385 | unsigned int r_type, | |
3386 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3387 | unsigned char* view, | |
fe8718a4 | 3388 | section_size_type view_size) |
56622147 ILT |
3389 | { |
3390 | // We have to actually change the instructions, which means that we | |
3391 | // need to examine the opcodes to figure out which instruction we | |
3392 | // are looking at. | |
3393 | if (r_type == elfcpp::R_386_TLS_IE) | |
3394 | { | |
3395 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3396 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3397 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3398 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3399 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3400 | ||
3401 | unsigned char op1 = view[-1]; | |
3402 | if (op1 == 0xa1) | |
3403 | { | |
3404 | // movl XX,%eax ==> movl $YY,%eax | |
3405 | view[-1] = 0xb8; | |
3406 | } | |
3407 | else | |
3408 | { | |
3409 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3410 | ||
3411 | unsigned char op2 = view[-2]; | |
3412 | if (op2 == 0x8b) | |
3413 | { | |
3414 | // movl XX,%reg ==> movl $YY,%reg | |
3415 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3416 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3417 | view[-2] = 0xc7; |
3418 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3419 | } | |
3420 | else if (op2 == 0x03) | |
3421 | { | |
3422 | // addl XX,%reg ==> addl $YY,%reg | |
3423 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3424 | (op1 & 0xc7) == 0x05); |
56622147 ILT |
3425 | view[-2] = 0x81; |
3426 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3427 | } | |
3428 | else | |
3429 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3430 | } | |
3431 | } | |
3432 | else | |
3433 | { | |
3434 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3435 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3436 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3437 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3438 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3439 | ||
3440 | unsigned char op1 = view[-1]; | |
3441 | unsigned char op2 = view[-2]; | |
3442 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2e702c99 | 3443 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); |
56622147 ILT |
3444 | if (op2 == 0x8b) |
3445 | { | |
3446 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3447 | view[-2] = 0xc7; | |
3448 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3449 | } | |
3450 | else if (op2 == 0x2b) | |
3451 | { | |
3452 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3453 | view[-2] = 0x81; | |
3454 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3455 | } | |
3456 | else if (op2 == 0x03) | |
3457 | { | |
3458 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3459 | view[-2] = 0x81; | |
3460 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3461 | } | |
3462 | else | |
3463 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3464 | } | |
3465 | ||
7bf1f802 | 3466 | value = tls_segment->memsz() - value; |
56622147 ILT |
3467 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3468 | value = - value; | |
3469 | ||
3470 | Relocate_functions<32, false>::rel32(view, value); | |
3471 | } | |
3472 | ||
61ba1cf9 ILT |
3473 | // Relocate section data. |
3474 | ||
3475 | void | |
92e059d8 | 3476 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3477 | unsigned int sh_type, |
3478 | const unsigned char* prelocs, | |
3479 | size_t reloc_count, | |
730cdc88 ILT |
3480 | Output_section* output_section, |
3481 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3482 | unsigned char* view, |
3483 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3484 | section_size_type view_size, |
3485 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3486 | { |
a3ad94ed | 3487 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3488 | |
ead1e424 | 3489 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
168a4726 | 3490 | Target_i386::Relocate, gold::Default_comdat_behavior>( |
92e059d8 | 3491 | relinfo, |
ead1e424 | 3492 | this, |
61ba1cf9 ILT |
3493 | prelocs, |
3494 | reloc_count, | |
730cdc88 ILT |
3495 | output_section, |
3496 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3497 | view, |
3498 | address, | |
364c7fa5 ILT |
3499 | view_size, |
3500 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3501 | } |
3502 | ||
6a74a719 ILT |
3503 | // Return the size of a relocation while scanning during a relocatable |
3504 | // link. | |
3505 | ||
3506 | unsigned int | |
3507 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3508 | unsigned int r_type, | |
3509 | Relobj* object) | |
3510 | { | |
3511 | switch (r_type) | |
3512 | { | |
3513 | case elfcpp::R_386_NONE: | |
3514 | case elfcpp::R_386_GNU_VTINHERIT: | |
3515 | case elfcpp::R_386_GNU_VTENTRY: | |
3516 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3517 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3518 | case elfcpp::R_386_TLS_DESC_CALL: | |
3519 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3520 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3521 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3522 | case elfcpp::R_386_TLS_IE_32: | |
3523 | case elfcpp::R_386_TLS_GOTIE: | |
3524 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3525 | case elfcpp::R_386_TLS_LE_32: | |
3526 | return 0; | |
3527 | ||
3528 | case elfcpp::R_386_32: | |
3529 | case elfcpp::R_386_PC32: | |
3530 | case elfcpp::R_386_GOT32: | |
3531 | case elfcpp::R_386_PLT32: | |
3532 | case elfcpp::R_386_GOTOFF: | |
3533 | case elfcpp::R_386_GOTPC: | |
3534 | return 4; | |
3535 | ||
3536 | case elfcpp::R_386_16: | |
3537 | case elfcpp::R_386_PC16: | |
3538 | return 2; | |
3539 | ||
3540 | case elfcpp::R_386_8: | |
3541 | case elfcpp::R_386_PC8: | |
3542 | return 1; | |
3543 | ||
3544 | // These are relocations which should only be seen by the | |
3545 | // dynamic linker, and should never be seen here. | |
3546 | case elfcpp::R_386_COPY: | |
3547 | case elfcpp::R_386_GLOB_DAT: | |
3548 | case elfcpp::R_386_JUMP_SLOT: | |
3549 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3550 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3551 | case elfcpp::R_386_TLS_TPOFF: |
3552 | case elfcpp::R_386_TLS_DTPMOD32: | |
3553 | case elfcpp::R_386_TLS_DTPOFF32: | |
3554 | case elfcpp::R_386_TLS_TPOFF32: | |
3555 | case elfcpp::R_386_TLS_DESC: | |
3556 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3557 | return 0; | |
3558 | ||
3559 | case elfcpp::R_386_32PLT: | |
3560 | case elfcpp::R_386_TLS_GD_32: | |
3561 | case elfcpp::R_386_TLS_GD_PUSH: | |
3562 | case elfcpp::R_386_TLS_GD_CALL: | |
3563 | case elfcpp::R_386_TLS_GD_POP: | |
3564 | case elfcpp::R_386_TLS_LDM_32: | |
3565 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3566 | case elfcpp::R_386_TLS_LDM_CALL: | |
3567 | case elfcpp::R_386_TLS_LDM_POP: | |
3568 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3569 | default: | |
3570 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3571 | return 0; | |
3572 | } | |
3573 | } | |
3574 | ||
3575 | // Scan the relocs during a relocatable link. | |
3576 | ||
3577 | void | |
ad0f2072 | 3578 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3579 | Layout* layout, |
6fa2a40b | 3580 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3581 | unsigned int data_shndx, |
3582 | unsigned int sh_type, | |
3583 | const unsigned char* prelocs, | |
3584 | size_t reloc_count, | |
3585 | Output_section* output_section, | |
3586 | bool needs_special_offset_handling, | |
3587 | size_t local_symbol_count, | |
3588 | const unsigned char* plocal_symbols, | |
3589 | Relocatable_relocs* rr) | |
3590 | { | |
3591 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3592 | ||
3593 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3594 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3595 | ||
7019cd25 | 3596 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3597 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3598 | symtab, |
3599 | layout, | |
3600 | object, | |
3601 | data_shndx, | |
3602 | prelocs, | |
3603 | reloc_count, | |
3604 | output_section, | |
3605 | needs_special_offset_handling, | |
3606 | local_symbol_count, | |
3607 | plocal_symbols, | |
3608 | rr); | |
3609 | } | |
3610 | ||
7404fe1b | 3611 | // Emit relocations for a section. |
6a74a719 ILT |
3612 | |
3613 | void | |
7404fe1b | 3614 | Target_i386::relocate_relocs( |
6a74a719 ILT |
3615 | const Relocate_info<32, false>* relinfo, |
3616 | unsigned int sh_type, | |
3617 | const unsigned char* prelocs, | |
3618 | size_t reloc_count, | |
3619 | Output_section* output_section, | |
cc928013 | 3620 | elfcpp::Elf_types<32>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
3621 | const Relocatable_relocs* rr, |
3622 | unsigned char* view, | |
3623 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3624 | section_size_type view_size, | |
3625 | unsigned char* reloc_view, | |
3626 | section_size_type reloc_view_size) | |
3627 | { | |
3628 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3629 | ||
7404fe1b | 3630 | gold::relocate_relocs<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3631 | relinfo, |
3632 | prelocs, | |
3633 | reloc_count, | |
3634 | output_section, | |
3635 | offset_in_output_section, | |
3636 | rr, | |
3637 | view, | |
3638 | view_address, | |
3639 | view_size, | |
3640 | reloc_view, | |
3641 | reloc_view_size); | |
3642 | } | |
3643 | ||
ab5c9e90 ILT |
3644 | // Return the value to use for a dynamic which requires special |
3645 | // treatment. This is how we support equality comparisons of function | |
3646 | // pointers across shared library boundaries, as described in the | |
3647 | // processor specific ABI supplement. | |
3648 | ||
3649 | uint64_t | |
3650 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3651 | { | |
3652 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 3653 | return this->plt_address_for_global(gsym); |
ab5c9e90 ILT |
3654 | } |
3655 | ||
c51e6221 ILT |
3656 | // Return a string used to fill a code section with nops to take up |
3657 | // the specified length. | |
3658 | ||
3659 | std::string | |
8851ecca | 3660 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3661 | { |
3662 | if (length >= 16) | |
3663 | { | |
3664 | // Build a jmp instruction to skip over the bytes. | |
3665 | unsigned char jmp[5]; | |
3666 | jmp[0] = 0xe9; | |
3667 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3668 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2e702c99 | 3669 | + std::string(length - 5, static_cast<char>(0x90))); |
c51e6221 ILT |
3670 | } |
3671 | ||
3672 | // Nop sequences of various lengths. | |
76677ad0 CC |
3673 | const char nop1[1] = { '\x90' }; // nop |
3674 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3675 | const char nop3[3] = { '\x8d', '\x76', '\x00' }; // leal 0(%esi),%esi | |
3676 | const char nop4[4] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
3677 | '\x00'}; | |
3678 | const char nop5[5] = { '\x90', '\x8d', '\x74', // nop | |
2e702c99 | 3679 | '\x26', '\x00' }; // leal 0(%esi,1),%esi |
76677ad0 | 3680 | const char nop6[6] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi |
2e702c99 | 3681 | '\x00', '\x00', '\x00' }; |
76677ad0 | 3682 | const char nop7[7] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3683 | '\x00', '\x00', '\x00', |
76677ad0 CC |
3684 | '\x00' }; |
3685 | const char nop8[8] = { '\x90', '\x8d', '\xb4', // nop | |
2e702c99 | 3686 | '\x26', '\x00', '\x00', // leal 0L(%esi,1),%esi |
76677ad0 CC |
3687 | '\x00', '\x00' }; |
3688 | const char nop9[9] = { '\x89', '\xf6', '\x8d', // movl %esi,%esi | |
2e702c99 | 3689 | '\xbc', '\x27', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3690 | '\x00', '\x00', '\x00' }; |
3691 | const char nop10[10] = { '\x8d', '\x76', '\x00', // leal 0(%esi),%esi | |
2e702c99 | 3692 | '\x8d', '\xbc', '\x27', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3693 | '\x00', '\x00', '\x00', |
3694 | '\x00' }; | |
3695 | const char nop11[11] = { '\x8d', '\x74', '\x26', // leal 0(%esi,1),%esi | |
2e702c99 | 3696 | '\x00', '\x8d', '\xbc', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3697 | '\x27', '\x00', '\x00', |
3698 | '\x00', '\x00' }; | |
3699 | const char nop12[12] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3700 | '\x00', '\x00', '\x00', // leal 0L(%edi),%edi |
76677ad0 CC |
3701 | '\x8d', '\xbf', '\x00', |
3702 | '\x00', '\x00', '\x00' }; | |
3703 | const char nop13[13] = { '\x8d', '\xb6', '\x00', // leal 0L(%esi),%esi | |
2e702c99 | 3704 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3705 | '\x8d', '\xbc', '\x27', |
3706 | '\x00', '\x00', '\x00', | |
2e702c99 | 3707 | '\x00' }; |
76677ad0 | 3708 | const char nop14[14] = { '\x8d', '\xb4', '\x26', // leal 0L(%esi,1),%esi |
2e702c99 | 3709 | '\x00', '\x00', '\x00', // leal 0L(%edi,1),%edi |
76677ad0 CC |
3710 | '\x00', '\x8d', '\xbc', |
3711 | '\x27', '\x00', '\x00', | |
2e702c99 | 3712 | '\x00', '\x00' }; |
76677ad0 | 3713 | const char nop15[15] = { '\xeb', '\x0d', '\x90', // jmp .+15 |
2e702c99 | 3714 | '\x90', '\x90', '\x90', // nop,nop,nop,... |
76677ad0 CC |
3715 | '\x90', '\x90', '\x90', |
3716 | '\x90', '\x90', '\x90', | |
2e702c99 | 3717 | '\x90', '\x90', '\x90' }; |
c51e6221 ILT |
3718 | |
3719 | const char* nops[16] = { | |
3720 | NULL, | |
3721 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3722 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3723 | }; | |
3724 | ||
3725 | return std::string(nops[length], length); | |
3726 | } | |
3727 | ||
02d7cd44 ILT |
3728 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3729 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3730 | // assembler can not write out the difference between two labels in | |
3731 | // different sections, so instead of using a pc-relative value they | |
3732 | // use an offset from the GOT. | |
3733 | ||
3734 | uint64_t | |
3735 | Target_i386::do_ehframe_datarel_base() const | |
3736 | { | |
3737 | gold_assert(this->global_offset_table_ != NULL); | |
3738 | Symbol* sym = this->global_offset_table_; | |
3739 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3740 | return ssym->value(); | |
3741 | } | |
3742 | ||
b6848d3c ILT |
3743 | // Return whether SYM should be treated as a call to a non-split |
3744 | // function. We don't want that to be true of a call to a | |
3745 | // get_pc_thunk function. | |
3746 | ||
3747 | bool | |
3748 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3749 | { | |
3750 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3751 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3752 | } | |
3753 | ||
364c7fa5 | 3754 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3755 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3756 | // code. We have to change the function so that it always ensures |
3757 | // that it has enough stack space to run some random function. | |
3758 | ||
3759 | void | |
3760 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2e702c99 RM |
3761 | section_offset_type fnoffset, |
3762 | section_size_type fnsize, | |
3763 | unsigned char* view, | |
3764 | section_size_type view_size, | |
3765 | std::string* from, | |
3766 | std::string* to) const | |
364c7fa5 ILT |
3767 | { |
3768 | // The function starts with a comparison of the stack pointer and a | |
3769 | // field in the TCB. This is followed by a jump. | |
3770 | ||
3771 | // cmp %gs:NN,%esp | |
3772 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3773 | && fnsize > 7) | |
3774 | { | |
3775 | // We will call __morestack if the carry flag is set after this | |
3776 | // comparison. We turn the comparison into an stc instruction | |
3777 | // and some nops. | |
3778 | view[fnoffset] = '\xf9'; | |
3779 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3780 | } | |
3781 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3782 | // lea NN(%esp),%edx |
3783 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3784 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3785 | && fnsize > 7) |
3786 | { | |
3787 | // This is loading an offset from the stack pointer for a | |
3788 | // comparison. The offset is negative, so we decrease the | |
3789 | // offset by the amount of space we need for the stack. This | |
3790 | // means we will avoid calling __morestack if there happens to | |
3791 | // be plenty of space on the stack already. | |
3792 | unsigned char* pval = view + fnoffset + 3; | |
3793 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3794 | val -= parameters->options().split_stack_adjust_size(); | |
3795 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3796 | } | |
3797 | else | |
3798 | { | |
3799 | if (!object->has_no_split_stack()) | |
3800 | object->error(_("failed to match split-stack sequence at " | |
3801 | "section %u offset %0zx"), | |
ac33a407 | 3802 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3803 | return; |
3804 | } | |
3805 | ||
3806 | // We have to change the function so that it calls | |
3807 | // __morestack_non_split instead of __morestack. The former will | |
3808 | // allocate additional stack space. | |
3809 | *from = "__morestack"; | |
3810 | *to = "__morestack_non_split"; | |
3811 | } | |
3812 | ||
2e702c99 RM |
3813 | // The selector for i386 object files. Note this is never instantiated |
3814 | // directly. It's only used in Target_selector_i386_nacl, below. | |
14bfc3f5 | 3815 | |
36959681 | 3816 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3817 | { |
3818 | public: | |
3819 | Target_selector_i386() | |
36959681 | 3820 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3821 | "elf32-i386", "elf32-i386-freebsd", |
3822 | "elf_i386") | |
14bfc3f5 ILT |
3823 | { } |
3824 | ||
3825 | Target* | |
e96caa79 ILT |
3826 | do_instantiate_target() |
3827 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3828 | }; |
3829 | ||
2e702c99 RM |
3830 | // NaCl variant. It uses different PLT contents. |
3831 | ||
3832 | class Output_data_plt_i386_nacl : public Output_data_plt_i386 | |
3833 | { | |
3834 | public: | |
3835 | Output_data_plt_i386_nacl(Layout* layout, | |
3836 | Output_data_space* got_plt, | |
3837 | Output_data_space* got_irelative) | |
3838 | : Output_data_plt_i386(layout, plt_entry_size, got_plt, got_irelative) | |
3839 | { } | |
3840 | ||
3841 | protected: | |
3842 | virtual unsigned int | |
3843 | do_get_plt_entry_size() const | |
3844 | { return plt_entry_size; } | |
3845 | ||
3846 | virtual void | |
3847 | do_add_eh_frame(Layout* layout) | |
3848 | { | |
3849 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
3850 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
3851 | } | |
3852 | ||
3853 | // The size of an entry in the PLT. | |
3854 | static const int plt_entry_size = 64; | |
3855 | ||
3856 | // The .eh_frame unwind information for the PLT. | |
3857 | static const int plt_eh_frame_fde_size = 32; | |
3858 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
3859 | }; | |
3860 | ||
3861 | class Output_data_plt_i386_nacl_exec : public Output_data_plt_i386_nacl | |
3862 | { | |
3863 | public: | |
3864 | Output_data_plt_i386_nacl_exec(Layout* layout, | |
3865 | Output_data_space* got_plt, | |
3866 | Output_data_space* got_irelative) | |
3867 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3868 | { } | |
3869 | ||
3870 | protected: | |
3871 | virtual void | |
3872 | do_fill_first_plt_entry(unsigned char* pov, | |
3873 | elfcpp::Elf_types<32>::Elf_Addr got_address); | |
3874 | ||
3875 | virtual unsigned int | |
3876 | do_fill_plt_entry(unsigned char* pov, | |
3877 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
3878 | unsigned int got_offset, | |
3879 | unsigned int plt_offset, | |
3880 | unsigned int plt_rel_offset); | |
3881 | ||
3882 | private: | |
3883 | // The first entry in the PLT for an executable. | |
3884 | static const unsigned char first_plt_entry[plt_entry_size]; | |
3885 | ||
3886 | // Other entries in the PLT for an executable. | |
3887 | static const unsigned char plt_entry[plt_entry_size]; | |
3888 | }; | |
3889 | ||
3890 | class Output_data_plt_i386_nacl_dyn : public Output_data_plt_i386_nacl | |
3891 | { | |
3892 | public: | |
3893 | Output_data_plt_i386_nacl_dyn(Layout* layout, | |
3894 | Output_data_space* got_plt, | |
3895 | Output_data_space* got_irelative) | |
3896 | : Output_data_plt_i386_nacl(layout, got_plt, got_irelative) | |
3897 | { } | |
3898 | ||
3899 | protected: | |
3900 | virtual void | |
3901 | do_fill_first_plt_entry(unsigned char* pov, elfcpp::Elf_types<32>::Elf_Addr); | |
3902 | ||
3903 | virtual unsigned int | |
3904 | do_fill_plt_entry(unsigned char* pov, | |
3905 | elfcpp::Elf_types<32>::Elf_Addr, | |
3906 | unsigned int got_offset, | |
3907 | unsigned int plt_offset, | |
3908 | unsigned int plt_rel_offset); | |
3909 | ||
3910 | private: | |
3911 | // The first entry in the PLT for a shared object. | |
3912 | static const unsigned char first_plt_entry[plt_entry_size]; | |
3913 | ||
3914 | // Other entries in the PLT for a shared object. | |
3915 | static const unsigned char plt_entry[plt_entry_size]; | |
3916 | }; | |
3917 | ||
3918 | class Target_i386_nacl : public Target_i386 | |
3919 | { | |
3920 | public: | |
3921 | Target_i386_nacl() | |
3922 | : Target_i386(&i386_nacl_info) | |
3923 | { } | |
3924 | ||
3925 | protected: | |
3926 | virtual Output_data_plt_i386* | |
3927 | do_make_data_plt(Layout* layout, | |
3928 | Output_data_space* got_plt, | |
3929 | Output_data_space* got_irelative, | |
3930 | bool dyn) | |
3931 | { | |
3932 | if (dyn) | |
3933 | return new Output_data_plt_i386_nacl_dyn(layout, got_plt, got_irelative); | |
3934 | else | |
3935 | return new Output_data_plt_i386_nacl_exec(layout, got_plt, got_irelative); | |
3936 | } | |
3937 | ||
3938 | private: | |
3939 | static const Target::Target_info i386_nacl_info; | |
3940 | }; | |
3941 | ||
3942 | const Target::Target_info Target_i386_nacl::i386_nacl_info = | |
3943 | { | |
3944 | 32, // size | |
3945 | false, // is_big_endian | |
3946 | elfcpp::EM_386, // machine_code | |
3947 | false, // has_make_symbol | |
3948 | false, // has_resolve | |
3949 | true, // has_code_fill | |
3950 | true, // is_default_stack_executable | |
3951 | true, // can_icf_inline_merge_sections | |
3952 | '\0', // wrap_char | |
3953 | "/lib/ld-nacl-x86-32.so.1", // dynamic_linker | |
3954 | 0x20000, // default_text_segment_address | |
3955 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
3956 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
3957 | true, // isolate_execinstr | |
3958 | 0x10000000, // rosegment_gap | |
3959 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3960 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3961 | 0, // small_common_section_flags | |
3962 | 0, // large_common_section_flags | |
3963 | NULL, // attributes_section | |
3964 | NULL // attributes_vendor | |
3965 | }; | |
3966 | ||
3967 | #define NACLMASK 0xe0 // 32-byte alignment mask | |
3968 | ||
3969 | const unsigned char | |
3970 | Output_data_plt_i386_nacl_exec::first_plt_entry[plt_entry_size] = | |
3971 | { | |
3972 | 0xff, 0x35, // pushl contents of memory address | |
3973 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
3974 | 0x8b, 0x0d, // movl contents of address, %ecx | |
3975 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
3976 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
3977 | 0xff, 0xe1, // jmp *%ecx | |
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, 0x90, // nops | |
3985 | 0x90, 0x90, 0x90, 0x90, 0x90 | |
3986 | }; | |
3987 | ||
3988 | void | |
3989 | Output_data_plt_i386_nacl_exec::do_fill_first_plt_entry( | |
3990 | unsigned char* pov, | |
3991 | elfcpp::Elf_types<32>::Elf_Addr got_address) | |
3992 | { | |
3993 | memcpy(pov, first_plt_entry, plt_entry_size); | |
3994 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
3995 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
3996 | } | |
3997 | ||
3998 | // The first entry in the PLT for a shared object. | |
3999 | ||
4000 | const unsigned char | |
4001 | Output_data_plt_i386_nacl_dyn::first_plt_entry[plt_entry_size] = | |
4002 | { | |
4003 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
4004 | 0x8b, 0x4b, 0x08, // mov 0x8(%ebx), %ecx | |
4005 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4006 | 0xff, 0xe1, // jmp *%ecx | |
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 | 0x90, 0x90, 0x90, 0x90, 0x90 // nops | |
4017 | }; | |
4018 | ||
4019 | void | |
4020 | Output_data_plt_i386_nacl_dyn::do_fill_first_plt_entry( | |
4021 | unsigned char* pov, | |
4022 | elfcpp::Elf_types<32>::Elf_Addr) | |
4023 | { | |
4024 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4025 | } | |
4026 | ||
4027 | // Subsequent entries in the PLT for an executable. | |
4028 | ||
4029 | const unsigned char | |
4030 | Output_data_plt_i386_nacl_exec::plt_entry[plt_entry_size] = | |
4031 | { | |
4032 | 0x8b, 0x0d, // movl contents of address, %ecx */ | |
4033 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4034 | 0x83, 0xe1, NACLMASK, // andl $NACLMASK, %ecx | |
4035 | 0xff, 0xe1, // jmp *%ecx | |
4036 | ||
4037 | // Pad to the next 32-byte boundary with nop instructions. | |
4038 | 0x90, | |
4039 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4040 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4041 | ||
4042 | // Lazy GOT entries point here (32-byte aligned). | |
4043 | 0x68, // pushl immediate | |
4044 | 0, 0, 0, 0, // replaced with offset into relocation table | |
4045 | 0xe9, // jmp relative | |
4046 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
4047 | ||
4048 | // Pad to the next 32-byte boundary with nop instructions. | |
4049 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4050 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4051 | 0x90, 0x90 | |
4052 | }; | |
4053 | ||
4054 | unsigned int | |
4055 | Output_data_plt_i386_nacl_exec::do_fill_plt_entry( | |
4056 | unsigned char* pov, | |
4057 | elfcpp::Elf_types<32>::Elf_Addr got_address, | |
4058 | unsigned int got_offset, | |
4059 | unsigned int plt_offset, | |
4060 | unsigned int plt_rel_offset) | |
4061 | { | |
4062 | memcpy(pov, plt_entry, plt_entry_size); | |
4063 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4064 | got_address + got_offset); | |
4065 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4066 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4067 | return 32; | |
4068 | } | |
4069 | ||
4070 | // Subsequent entries in the PLT for a shared object. | |
4071 | ||
4072 | const unsigned char | |
4073 | Output_data_plt_i386_nacl_dyn::plt_entry[plt_entry_size] = | |
4074 | { | |
4075 | 0x8b, 0x8b, // movl offset(%ebx), %ecx | |
4076 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
4077 | 0x83, 0xe1, 0xe0, // andl $NACLMASK, %ecx | |
4078 | 0xff, 0xe1, // jmp *%ecx | |
4079 | ||
4080 | // Pad to the next 32-byte boundary with nop instructions. | |
4081 | 0x90, | |
4082 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4083 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4084 | ||
4085 | // Lazy GOT entries point here (32-byte aligned). | |
4086 | 0x68, // pushl immediate | |
4087 | 0, 0, 0, 0, // replaced with offset into relocation table. | |
4088 | 0xe9, // jmp relative | |
4089 | 0, 0, 0, 0, // replaced with offset to start of .plt. | |
4090 | ||
4091 | // Pad to the next 32-byte boundary with nop instructions. | |
4092 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4093 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, | |
4094 | 0x90, 0x90 | |
4095 | }; | |
4096 | ||
4097 | unsigned int | |
4098 | Output_data_plt_i386_nacl_dyn::do_fill_plt_entry( | |
4099 | unsigned char* pov, | |
4100 | elfcpp::Elf_types<32>::Elf_Addr, | |
4101 | unsigned int got_offset, | |
4102 | unsigned int plt_offset, | |
4103 | unsigned int plt_rel_offset) | |
4104 | { | |
4105 | memcpy(pov, plt_entry, plt_entry_size); | |
4106 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
4107 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_rel_offset); | |
4108 | elfcpp::Swap<32, false>::writeval(pov + 38, - (plt_offset + 38 + 4)); | |
4109 | return 32; | |
4110 | } | |
4111 | ||
4112 | const unsigned char | |
4113 | Output_data_plt_i386_nacl::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4114 | { | |
4115 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4116 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4117 | 0, // Augmentation size. | |
4118 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
4119 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4120 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
4121 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4122 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4123 | 13, // Block length. | |
4124 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
4125 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
4126 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4127 | elfcpp::DW_OP_and, // & (%eip & 0x3f). | |
4128 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4129 | elfcpp::DW_OP_ge, // >= ((%eip & 0x3f) >= 0x25) | |
4130 | elfcpp::DW_OP_lit2, // Push 2. | |
4131 | elfcpp::DW_OP_shl, // << (((%eip & 0x3f) >= 0x25) << 2) | |
4132 | elfcpp::DW_OP_plus, // + ((((%eip&0x3f)>=0x25)<<2)+%esp+4 | |
4133 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4134 | elfcpp::DW_CFA_nop | |
4135 | }; | |
4136 | ||
4137 | // The selector for i386-nacl object files. | |
4138 | ||
4139 | class Target_selector_i386_nacl | |
4140 | : public Target_selector_nacl<Target_selector_i386, Target_i386_nacl> | |
4141 | { | |
4142 | public: | |
4143 | Target_selector_i386_nacl() | |
4144 | : Target_selector_nacl<Target_selector_i386, | |
4145 | Target_i386_nacl>("x86-32", | |
4146 | "elf32-i386-nacl", | |
4147 | "elf_i386_nacl") | |
4148 | { } | |
4149 | }; | |
4150 | ||
4151 | Target_selector_i386_nacl target_selector_i386; | |
14bfc3f5 ILT |
4152 | |
4153 | } // End anonymous namespace. |