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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
b3ce541e | 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
14bfc3f5 | 23 | #include "gold.h" |
ead1e424 ILT |
24 | |
25 | #include <cstring> | |
26 | ||
14bfc3f5 | 27 | #include "elfcpp.h" |
07a60597 | 28 | #include "dwarf.h" |
7e1edb90 | 29 | #include "parameters.h" |
92e059d8 | 30 | #include "reloc.h" |
61ba1cf9 ILT |
31 | #include "i386.h" |
32 | #include "object.h" | |
ead1e424 | 33 | #include "symtab.h" |
92e059d8 ILT |
34 | #include "layout.h" |
35 | #include "output.h" | |
12c0daef | 36 | #include "copy-relocs.h" |
14bfc3f5 | 37 | #include "target.h" |
61ba1cf9 | 38 | #include "target-reloc.h" |
14bfc3f5 | 39 | #include "target-select.h" |
af6359d5 | 40 | #include "tls.h" |
36959681 | 41 | #include "freebsd.h" |
f345227a | 42 | #include "gc.h" |
14bfc3f5 ILT |
43 | |
44 | namespace | |
45 | { | |
46 | ||
47 | using namespace gold; | |
48 | ||
7223e9ca ILT |
49 | // A class to handle the PLT data. |
50 | ||
51 | class Output_data_plt_i386 : public Output_section_data | |
52 | { | |
53 | public: | |
54 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
55 | ||
67181c72 | 56 | Output_data_plt_i386(Layout*, Output_data_space*, Output_data_space*); |
7223e9ca ILT |
57 | |
58 | // Add an entry to the PLT. | |
59 | void | |
67181c72 | 60 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
61 | |
62 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
63 | unsigned int | |
67181c72 ILT |
64 | add_local_ifunc_entry(Symbol_table*, Layout*, |
65 | Sized_relobj_file<32, false>* relobj, | |
7223e9ca ILT |
66 | unsigned int local_sym_index); |
67 | ||
68 | // Return the .rel.plt section data. | |
69 | Reloc_section* | |
70 | rel_plt() const | |
71 | { return this->rel_; } | |
72 | ||
73 | // Return where the TLS_DESC relocations should go. | |
74 | Reloc_section* | |
75 | rel_tls_desc(Layout*); | |
76 | ||
67181c72 ILT |
77 | // Return where the IRELATIVE relocations should go. |
78 | Reloc_section* | |
79 | rel_irelative(Symbol_table*, Layout*); | |
80 | ||
81 | // Return whether we created a section for IRELATIVE relocations. | |
82 | bool | |
83 | has_irelative_section() const | |
84 | { return this->irelative_rel_ != NULL; } | |
85 | ||
7223e9ca ILT |
86 | // Return the number of PLT entries. |
87 | unsigned int | |
88 | entry_count() const | |
67181c72 | 89 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
90 | |
91 | // Return the offset of the first non-reserved PLT entry. | |
92 | static unsigned int | |
93 | first_plt_entry_offset() | |
94 | { return plt_entry_size; } | |
95 | ||
96 | // Return the size of a PLT entry. | |
97 | static unsigned int | |
98 | get_plt_entry_size() | |
99 | { return plt_entry_size; } | |
100 | ||
67181c72 ILT |
101 | // Return the PLT address to use for a global symbol. |
102 | uint64_t | |
103 | address_for_global(const Symbol*); | |
104 | ||
105 | // Return the PLT address to use for a local symbol. | |
106 | uint64_t | |
107 | address_for_local(const Relobj*, unsigned int symndx); | |
108 | ||
7223e9ca ILT |
109 | protected: |
110 | void | |
111 | do_adjust_output_section(Output_section* os); | |
112 | ||
113 | // Write to a map file. | |
114 | void | |
115 | do_print_to_mapfile(Mapfile* mapfile) const | |
116 | { mapfile->print_output_data(this, _("** PLT")); } | |
117 | ||
118 | private: | |
119 | // The size of an entry in the PLT. | |
120 | static const int plt_entry_size = 16; | |
121 | ||
122 | // The first entry in the PLT for an executable. | |
07a60597 | 123 | static const unsigned char exec_first_plt_entry[plt_entry_size]; |
7223e9ca ILT |
124 | |
125 | // The first entry in the PLT for a shared object. | |
07a60597 | 126 | static const unsigned char dyn_first_plt_entry[plt_entry_size]; |
7223e9ca ILT |
127 | |
128 | // Other entries in the PLT for an executable. | |
07a60597 | 129 | static const unsigned char exec_plt_entry[plt_entry_size]; |
7223e9ca ILT |
130 | |
131 | // Other entries in the PLT for a shared object. | |
07a60597 ILT |
132 | static const unsigned char dyn_plt_entry[plt_entry_size]; |
133 | ||
134 | // The .eh_frame unwind information for the PLT. | |
135 | static const int plt_eh_frame_cie_size = 16; | |
136 | static const int plt_eh_frame_fde_size = 32; | |
137 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; | |
138 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
7223e9ca ILT |
139 | |
140 | // Set the final size. | |
141 | void | |
142 | set_final_data_size() | |
67181c72 ILT |
143 | { |
144 | this->set_data_size((this->count_ + this->irelative_count_ + 1) | |
145 | * plt_entry_size); | |
146 | } | |
7223e9ca ILT |
147 | |
148 | // Write out the PLT data. | |
149 | void | |
150 | do_write(Output_file*); | |
151 | ||
152 | // We keep a list of global STT_GNU_IFUNC symbols, each with its | |
153 | // offset in the GOT. | |
154 | struct Global_ifunc | |
155 | { | |
156 | Symbol* sym; | |
157 | unsigned int got_offset; | |
158 | }; | |
159 | ||
160 | // We keep a list of local STT_GNU_IFUNC symbols, each with its | |
161 | // offset in the GOT. | |
162 | struct Local_ifunc | |
163 | { | |
6fa2a40b | 164 | Sized_relobj_file<32, false>* object; |
7223e9ca ILT |
165 | unsigned int local_sym_index; |
166 | unsigned int got_offset; | |
167 | }; | |
168 | ||
169 | // The reloc section. | |
170 | Reloc_section* rel_; | |
171 | // The TLS_DESC relocations, if necessary. These must follow the | |
172 | // regular PLT relocs. | |
173 | Reloc_section* tls_desc_rel_; | |
67181c72 ILT |
174 | // The IRELATIVE relocations, if necessary. These must follow the |
175 | // regular relocatoins and the TLS_DESC relocations. | |
176 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
177 | // The .got.plt section. |
178 | Output_data_space* got_plt_; | |
67181c72 ILT |
179 | // The part of the .got.plt section used for IRELATIVE relocs. |
180 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
181 | // The number of PLT entries. |
182 | unsigned int count_; | |
67181c72 ILT |
183 | // Number of PLT entries with R_386_IRELATIVE relocs. These follow |
184 | // the regular PLT entries. | |
185 | unsigned int irelative_count_; | |
7223e9ca ILT |
186 | // Global STT_GNU_IFUNC symbols. |
187 | std::vector<Global_ifunc> global_ifuncs_; | |
188 | // Local STT_GNU_IFUNC symbols. | |
189 | std::vector<Local_ifunc> local_ifuncs_; | |
190 | }; | |
a3ad94ed | 191 | |
14bfc3f5 | 192 | // The i386 target class. |
e041f13d ILT |
193 | // TLS info comes from |
194 | // http://people.redhat.com/drepper/tls.pdf | |
195 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 196 | |
200b2bb9 | 197 | class Target_i386 : public Sized_target<32, false> |
14bfc3f5 ILT |
198 | { |
199 | public: | |
5a6f7e2d ILT |
200 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
201 | ||
14bfc3f5 | 202 | Target_i386() |
200b2bb9 | 203 | : Sized_target<32, false>(&i386_info), |
67181c72 ILT |
204 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
205 | got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL), | |
206 | rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 207 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 208 | { } |
75f65a3e | 209 | |
6d03d481 ST |
210 | // Process the relocations to determine unreferenced sections for |
211 | // garbage collection. | |
212 | void | |
ad0f2072 | 213 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 214 | Layout* layout, |
6fa2a40b | 215 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
216 | unsigned int data_shndx, |
217 | unsigned int sh_type, | |
218 | const unsigned char* prelocs, | |
219 | size_t reloc_count, | |
220 | Output_section* output_section, | |
221 | bool needs_special_offset_handling, | |
222 | size_t local_symbol_count, | |
223 | const unsigned char* plocal_symbols); | |
224 | ||
92e059d8 | 225 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 226 | void |
ad0f2072 | 227 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 228 | Layout* layout, |
6fa2a40b | 229 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 230 | unsigned int data_shndx, |
92e059d8 ILT |
231 | unsigned int sh_type, |
232 | const unsigned char* prelocs, | |
233 | size_t reloc_count, | |
730cdc88 ILT |
234 | Output_section* output_section, |
235 | bool needs_special_offset_handling, | |
92e059d8 | 236 | size_t local_symbol_count, |
730cdc88 | 237 | const unsigned char* plocal_symbols); |
61ba1cf9 | 238 | |
5a6f7e2d ILT |
239 | // Finalize the sections. |
240 | void | |
f59f41f3 | 241 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 242 | |
ab5c9e90 ILT |
243 | // Return the value to use for a dynamic which requires special |
244 | // treatment. | |
245 | uint64_t | |
246 | do_dynsym_value(const Symbol*) const; | |
247 | ||
92e059d8 ILT |
248 | // Relocate a section. |
249 | void | |
250 | relocate_section(const Relocate_info<32, false>*, | |
251 | unsigned int sh_type, | |
252 | const unsigned char* prelocs, | |
253 | size_t reloc_count, | |
730cdc88 ILT |
254 | Output_section* output_section, |
255 | bool needs_special_offset_handling, | |
92e059d8 ILT |
256 | unsigned char* view, |
257 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
258 | section_size_type view_size, |
259 | const Reloc_symbol_changes*); | |
92e059d8 | 260 | |
6a74a719 ILT |
261 | // Scan the relocs during a relocatable link. |
262 | void | |
ad0f2072 | 263 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 264 | Layout* layout, |
6fa2a40b | 265 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
266 | unsigned int data_shndx, |
267 | unsigned int sh_type, | |
268 | const unsigned char* prelocs, | |
269 | size_t reloc_count, | |
270 | Output_section* output_section, | |
271 | bool needs_special_offset_handling, | |
272 | size_t local_symbol_count, | |
273 | const unsigned char* plocal_symbols, | |
274 | Relocatable_relocs*); | |
275 | ||
276 | // Relocate a section during a relocatable link. | |
277 | void | |
278 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
279 | unsigned int sh_type, | |
280 | const unsigned char* prelocs, | |
281 | size_t reloc_count, | |
282 | Output_section* output_section, | |
283 | off_t offset_in_output_section, | |
284 | const Relocatable_relocs*, | |
285 | unsigned char* view, | |
286 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
287 | section_size_type view_size, | |
288 | unsigned char* reloc_view, | |
289 | section_size_type reloc_view_size); | |
290 | ||
c51e6221 ILT |
291 | // Return a string used to fill a code section with nops. |
292 | std::string | |
8851ecca | 293 | do_code_fill(section_size_type length) const; |
c51e6221 | 294 | |
9a2d6984 ILT |
295 | // Return whether SYM is defined by the ABI. |
296 | bool | |
9c2d0ef9 | 297 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
298 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
299 | ||
bb04269c DK |
300 | // Return whether a symbol name implies a local label. The UnixWare |
301 | // 2.1 cc generates temporary symbols that start with .X, so we | |
302 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
303 | // If so, we should move the .X recognition into | |
304 | // Target::do_is_local_label_name. | |
305 | bool | |
306 | do_is_local_label_name(const char* name) const | |
307 | { | |
308 | if (name[0] == '.' && name[1] == 'X') | |
309 | return true; | |
310 | return Target::do_is_local_label_name(name); | |
311 | } | |
312 | ||
67181c72 ILT |
313 | // Return the PLT address to use for a global symbol. |
314 | uint64_t | |
315 | do_plt_address_for_global(const Symbol* gsym) const | |
316 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 317 | |
67181c72 ILT |
318 | uint64_t |
319 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
320 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 321 | |
b3ce541e ILT |
322 | // We can tell whether we take the address of a function. |
323 | inline bool | |
324 | do_can_check_for_function_pointers() const | |
325 | { return true; } | |
326 | ||
02d7cd44 ILT |
327 | // Return the base for a DW_EH_PE_datarel encoding. |
328 | uint64_t | |
329 | do_ehframe_datarel_base() const; | |
330 | ||
b6848d3c ILT |
331 | // Return whether SYM is call to a non-split function. |
332 | bool | |
333 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
334 | ||
9b547ce6 | 335 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
336 | void |
337 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
338 | section_offset_type fnoffset, section_size_type fnsize, | |
339 | unsigned char* view, section_size_type view_size, | |
340 | std::string* from, std::string* to) const; | |
341 | ||
96f2030e | 342 | // Return the size of the GOT section. |
fe8718a4 | 343 | section_size_type |
0e70b911 | 344 | got_size() const |
96f2030e ILT |
345 | { |
346 | gold_assert(this->got_ != NULL); | |
347 | return this->got_->data_size(); | |
348 | } | |
349 | ||
0e70b911 CC |
350 | // Return the number of entries in the GOT. |
351 | unsigned int | |
352 | got_entry_count() const | |
353 | { | |
354 | if (this->got_ == NULL) | |
355 | return 0; | |
356 | return this->got_size() / 4; | |
357 | } | |
358 | ||
359 | // Return the number of entries in the PLT. | |
360 | unsigned int | |
361 | plt_entry_count() const; | |
362 | ||
363 | // Return the offset of the first non-reserved PLT entry. | |
364 | unsigned int | |
365 | first_plt_entry_offset() const; | |
366 | ||
367 | // Return the size of each PLT entry. | |
368 | unsigned int | |
369 | plt_entry_size() const; | |
370 | ||
92e059d8 ILT |
371 | private: |
372 | // The class which scans relocations. | |
373 | struct Scan | |
61ba1cf9 | 374 | { |
95a2c8d6 RS |
375 | static inline int |
376 | ||
377 | get_reference_flags(unsigned int r_type); | |
378 | ||
61ba1cf9 | 379 | inline void |
ad0f2072 | 380 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 381 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 382 | unsigned int data_shndx, |
07f397ab | 383 | Output_section* output_section, |
92e059d8 ILT |
384 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
385 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 386 | |
92e059d8 | 387 | inline void |
ad0f2072 | 388 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 389 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 390 | unsigned int data_shndx, |
07f397ab | 391 | Output_section* output_section, |
92e059d8 ILT |
392 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
393 | Symbol* gsym); | |
af6359d5 | 394 | |
21bb3914 | 395 | inline bool |
0897ed3b ST |
396 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
397 | Target_i386* target, | |
6fa2a40b | 398 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
399 | unsigned int data_shndx, |
400 | Output_section* output_section, | |
401 | const elfcpp::Rel<32, false>& reloc, | |
402 | unsigned int r_type, | |
403 | const elfcpp::Sym<32, false>& lsym); | |
404 | ||
405 | inline bool | |
406 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
407 | Target_i386* target, | |
6fa2a40b | 408 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
409 | unsigned int data_shndx, |
410 | Output_section* output_section, | |
411 | const elfcpp::Rel<32, false>& reloc, | |
412 | unsigned int r_type, | |
413 | Symbol* gsym); | |
21bb3914 ST |
414 | |
415 | inline bool | |
0897ed3b | 416 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 417 | |
7223e9ca | 418 | bool |
6fa2a40b CC |
419 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
420 | unsigned int r_type); | |
7223e9ca | 421 | |
af6359d5 | 422 | static void |
6fa2a40b | 423 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
424 | |
425 | static void | |
6fa2a40b | 426 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 427 | Symbol*); |
61ba1cf9 ILT |
428 | }; |
429 | ||
92e059d8 ILT |
430 | // The class which implements relocation. |
431 | class Relocate | |
432 | { | |
433 | public: | |
ead1e424 | 434 | Relocate() |
46cf9fa2 | 435 | : skip_call_tls_get_addr_(false), |
82bb573a | 436 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
437 | { } |
438 | ||
439 | ~Relocate() | |
440 | { | |
441 | if (this->skip_call_tls_get_addr_) | |
442 | { | |
443 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 444 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
445 | } |
446 | } | |
447 | ||
86849f1f ILT |
448 | // Return whether the static relocation needs to be applied. |
449 | inline bool | |
450 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 451 | unsigned int r_type, |
031cdbed ILT |
452 | bool is_32bit, |
453 | Output_section* output_section); | |
86849f1f | 454 | |
ead1e424 ILT |
455 | // Do a relocation. Return false if the caller should not issue |
456 | // any warnings about this relocation. | |
457 | inline bool | |
031cdbed ILT |
458 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
459 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 460 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 461 | const Symbol_value<32>*, |
92e059d8 | 462 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 463 | section_size_type); |
92e059d8 ILT |
464 | |
465 | private: | |
466 | // Do a TLS relocation. | |
ead1e424 | 467 | inline void |
07f397ab ILT |
468 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
469 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 470 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 471 | const Symbol_value<32>*, |
fe8718a4 ILT |
472 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
473 | section_size_type); | |
92e059d8 | 474 | |
07f397ab ILT |
475 | // Do a TLS General-Dynamic to Initial-Exec transition. |
476 | inline void | |
477 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
478 | Output_segment* tls_segment, | |
479 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
480 | elfcpp::Elf_types<32>::Elf_Addr value, | |
481 | unsigned char* view, | |
fe8718a4 | 482 | section_size_type view_size); |
07f397ab | 483 | |
56622147 ILT |
484 | // Do a TLS General-Dynamic to Local-Exec transition. |
485 | inline void | |
486 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
487 | Output_segment* tls_segment, |
488 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
489 | elfcpp::Elf_types<32>::Elf_Addr value, | |
490 | unsigned char* view, | |
fe8718a4 | 491 | section_size_type view_size); |
92e059d8 | 492 | |
c2b45e22 CC |
493 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
494 | // transition. | |
495 | inline void | |
496 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
497 | Output_segment* tls_segment, | |
498 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
499 | elfcpp::Elf_types<32>::Elf_Addr value, | |
500 | unsigned char* view, | |
501 | section_size_type view_size); | |
502 | ||
503 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
504 | // transition. | |
505 | inline void | |
506 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
507 | Output_segment* tls_segment, | |
508 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
509 | elfcpp::Elf_types<32>::Elf_Addr value, | |
510 | unsigned char* view, | |
511 | section_size_type view_size); | |
512 | ||
56622147 | 513 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 514 | inline void |
56622147 | 515 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
516 | Output_segment* tls_segment, |
517 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
518 | elfcpp::Elf_types<32>::Elf_Addr value, | |
519 | unsigned char* view, | |
fe8718a4 | 520 | section_size_type view_size); |
ead1e424 | 521 | |
56622147 ILT |
522 | // Do a TLS Initial-Exec to Local-Exec transition. |
523 | static inline void | |
524 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
525 | Output_segment* tls_segment, |
526 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
527 | elfcpp::Elf_types<32>::Elf_Addr value, | |
528 | unsigned char* view, | |
fe8718a4 | 529 | section_size_type view_size); |
46cf9fa2 | 530 | |
46cf9fa2 ILT |
531 | // We need to keep track of which type of local dynamic relocation |
532 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
533 | enum Local_dynamic_type | |
534 | { | |
535 | LOCAL_DYNAMIC_NONE, | |
536 | LOCAL_DYNAMIC_SUN, | |
537 | LOCAL_DYNAMIC_GNU | |
538 | }; | |
539 | ||
ead1e424 ILT |
540 | // This is set if we should skip the next reloc, which should be a |
541 | // PLT32 reloc against ___tls_get_addr. | |
542 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
543 | // The type of local dynamic relocation we have seen in the section |
544 | // being relocated, if any. | |
545 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
546 | }; |
547 | ||
6a74a719 ILT |
548 | // A class which returns the size required for a relocation type, |
549 | // used while scanning relocs during a relocatable link. | |
550 | class Relocatable_size_for_reloc | |
551 | { | |
552 | public: | |
553 | unsigned int | |
554 | get_size_for_reloc(unsigned int, Relobj*); | |
555 | }; | |
556 | ||
92e059d8 ILT |
557 | // Adjust TLS relocation type based on the options and whether this |
558 | // is a local symbol. | |
af6359d5 | 559 | static tls::Tls_optimization |
7e1edb90 | 560 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 561 | |
ead1e424 | 562 | // Get the GOT section, creating it if necessary. |
dbe717ef | 563 | Output_data_got<32, false>* |
7e1edb90 | 564 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 565 | |
96f2030e ILT |
566 | // Get the GOT PLT section. |
567 | Output_data_space* | |
568 | got_plt_section() const | |
569 | { | |
570 | gold_assert(this->got_plt_ != NULL); | |
571 | return this->got_plt_; | |
572 | } | |
573 | ||
a8df5856 ILT |
574 | // Get the GOT section for TLSDESC entries. |
575 | Output_data_got<32, false>* | |
576 | got_tlsdesc_section() const | |
577 | { | |
578 | gold_assert(this->got_tlsdesc_ != NULL); | |
579 | return this->got_tlsdesc_; | |
580 | } | |
581 | ||
7223e9ca ILT |
582 | // Create the PLT section. |
583 | void | |
584 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
585 | ||
a3ad94ed ILT |
586 | // Create a PLT entry for a global symbol. |
587 | void | |
7e1edb90 | 588 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 589 | |
7223e9ca ILT |
590 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
591 | void | |
592 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 593 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
594 | unsigned int local_sym_index); |
595 | ||
9fa33bee | 596 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
597 | void |
598 | define_tls_base_symbol(Symbol_table*, Layout*); | |
599 | ||
94c4710f ILT |
600 | // Create a GOT entry for the TLS module index. |
601 | unsigned int | |
602 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 603 | Sized_relobj_file<32, false>* object); |
94c4710f | 604 | |
a3ad94ed | 605 | // Get the PLT section. |
e291e7b9 | 606 | Output_data_plt_i386* |
a3ad94ed ILT |
607 | plt_section() const |
608 | { | |
609 | gold_assert(this->plt_ != NULL); | |
610 | return this->plt_; | |
611 | } | |
612 | ||
5a6f7e2d ILT |
613 | // Get the dynamic reloc section, creating it if necessary. |
614 | Reloc_section* | |
615 | rel_dyn_section(Layout*); | |
616 | ||
e291e7b9 ILT |
617 | // Get the section to use for TLS_DESC relocations. |
618 | Reloc_section* | |
619 | rel_tls_desc_section(Layout*) const; | |
620 | ||
67181c72 ILT |
621 | // Get the section to use for IRELATIVE relocations. |
622 | Reloc_section* | |
623 | rel_irelative_section(Layout*); | |
624 | ||
12c0daef | 625 | // Add a potential copy relocation. |
a3ad94ed | 626 | void |
ef9beddf | 627 | copy_reloc(Symbol_table* symtab, Layout* layout, |
6fa2a40b | 628 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
629 | unsigned int shndx, Output_section* output_section, |
630 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
631 | { | |
632 | this->copy_relocs_.copy_reloc(symtab, layout, | |
633 | symtab->get_sized_symbol<32>(sym), | |
634 | object, shndx, output_section, reloc, | |
635 | this->rel_dyn_section(layout)); | |
636 | } | |
ead1e424 | 637 | |
92e059d8 ILT |
638 | // Information about this specific target which we pass to the |
639 | // general Target structure. | |
75f65a3e | 640 | static const Target::Target_info i386_info; |
ead1e424 | 641 | |
0a65a3a7 | 642 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
643 | // These values are exposed to the ABI in an incremental link. |
644 | // Do not renumber existing values without changing the version | |
645 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
646 | enum Got_type |
647 | { | |
648 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
649 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
650 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
651 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
652 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
653 | }; |
654 | ||
ead1e424 | 655 | // The GOT section. |
dbe717ef | 656 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
657 | // The PLT section. |
658 | Output_data_plt_i386* plt_; | |
659 | // The GOT PLT section. | |
660 | Output_data_space* got_plt_; | |
67181c72 ILT |
661 | // The GOT section for IRELATIVE relocations. |
662 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
663 | // The GOT section for TLSDESC relocations. |
664 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
665 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
666 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
667 | // The dynamic reloc section. |
668 | Reloc_section* rel_dyn_; | |
67181c72 ILT |
669 | // The section to use for IRELATIVE relocs. |
670 | Reloc_section* rel_irelative_; | |
5a6f7e2d | 671 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 672 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
673 | // Space for variables copied with a COPY reloc. |
674 | Output_data_space* dynbss_; | |
c2b45e22 | 675 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 676 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
677 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
678 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
679 | }; |
680 | ||
681 | const Target::Target_info Target_i386::i386_info = | |
682 | { | |
61ba1cf9 ILT |
683 | 32, // size |
684 | false, // is_big_endian | |
685 | elfcpp::EM_386, // machine_code | |
686 | false, // has_make_symbol | |
dbe717ef | 687 | false, // has_resolve |
c51e6221 | 688 | true, // has_code_fill |
35cdfc9a | 689 | true, // is_default_stack_executable |
b3ce541e | 690 | true, // can_icf_inline_merge_sections |
0864d551 | 691 | '\0', // wrap_char |
dbe717ef | 692 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 693 | 0x08048000, // default_text_segment_address |
cd72c291 | 694 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
695 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
696 | elfcpp::SHN_UNDEF, // small_common_shndx | |
697 | elfcpp::SHN_UNDEF, // large_common_shndx | |
698 | 0, // small_common_section_flags | |
05a352e6 DK |
699 | 0, // large_common_section_flags |
700 | NULL, // attributes_section | |
701 | NULL // attributes_vendor | |
14bfc3f5 ILT |
702 | }; |
703 | ||
ead1e424 ILT |
704 | // Get the GOT section, creating it if necessary. |
705 | ||
dbe717ef | 706 | Output_data_got<32, false>* |
7e1edb90 | 707 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
708 | { |
709 | if (this->got_ == NULL) | |
710 | { | |
7e1edb90 | 711 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 712 | |
7e1edb90 | 713 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 714 | |
9446efde ILT |
715 | // When using -z now, we can treat .got.plt as a relro section. |
716 | // Without -z now, it is modified after program startup by lazy | |
717 | // PLT relocations. | |
718 | bool is_got_plt_relro = parameters->options().now(); | |
719 | Output_section_order got_order = (is_got_plt_relro | |
720 | ? ORDER_RELRO | |
721 | : ORDER_RELRO_LAST); | |
722 | Output_section_order got_plt_order = (is_got_plt_relro | |
723 | ? ORDER_RELRO | |
724 | : ORDER_NON_RELRO_FIRST); | |
725 | ||
82742395 ILT |
726 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
727 | (elfcpp::SHF_ALLOC | |
728 | | elfcpp::SHF_WRITE), | |
9446efde | 729 | this->got_, got_order, true); |
ead1e424 | 730 | |
7d9e3d98 | 731 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
732 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
733 | (elfcpp::SHF_ALLOC | |
734 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
735 | this->got_plt_, got_plt_order, |
736 | is_got_plt_relro); | |
a3ad94ed | 737 | |
ead1e424 | 738 | // The first three entries are reserved. |
27bc2bce | 739 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 740 | |
9446efde ILT |
741 | if (!is_got_plt_relro) |
742 | { | |
743 | // Those bytes can go into the relro segment. | |
744 | layout->increase_relro(3 * 4); | |
745 | } | |
1a2dff53 | 746 | |
a3ad94ed | 747 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
748 | this->global_offset_table_ = |
749 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
750 | Symbol_table::PREDEFINED, | |
751 | this->got_plt_, | |
752 | 0, 0, elfcpp::STT_OBJECT, | |
753 | elfcpp::STB_LOCAL, | |
754 | elfcpp::STV_HIDDEN, 0, | |
755 | false, false); | |
a8df5856 | 756 | |
67181c72 ILT |
757 | // If there are any IRELATIVE relocations, they get GOT entries |
758 | // in .got.plt after the jump slot relocations. | |
759 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
760 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
761 | (elfcpp::SHF_ALLOC | |
762 | | elfcpp::SHF_WRITE), | |
763 | this->got_irelative_, | |
9446efde | 764 | got_plt_order, is_got_plt_relro); |
67181c72 | 765 | |
a8df5856 ILT |
766 | // If there are any TLSDESC relocations, they get GOT entries in |
767 | // .got.plt after the jump slot entries. | |
768 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
769 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
770 | (elfcpp::SHF_ALLOC | |
771 | | elfcpp::SHF_WRITE), | |
22f0da72 | 772 | this->got_tlsdesc_, |
9446efde | 773 | got_plt_order, is_got_plt_relro); |
ead1e424 | 774 | } |
a3ad94ed | 775 | |
ead1e424 ILT |
776 | return this->got_; |
777 | } | |
778 | ||
5a6f7e2d ILT |
779 | // Get the dynamic reloc section, creating it if necessary. |
780 | ||
781 | Target_i386::Reloc_section* | |
782 | Target_i386::rel_dyn_section(Layout* layout) | |
783 | { | |
784 | if (this->rel_dyn_ == NULL) | |
785 | { | |
786 | gold_assert(layout != NULL); | |
d98bc257 | 787 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 788 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
789 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
790 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
791 | } |
792 | return this->rel_dyn_; | |
793 | } | |
794 | ||
67181c72 ILT |
795 | // Get the section to use for IRELATIVE relocs, creating it if |
796 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
797 | // relocations. They need to follow the other dynamic relocations so | |
798 | // that they can refer to global variables initialized by those | |
799 | // relocs. | |
800 | ||
801 | Target_i386::Reloc_section* | |
802 | Target_i386::rel_irelative_section(Layout* layout) | |
803 | { | |
804 | if (this->rel_irelative_ == NULL) | |
805 | { | |
806 | // Make sure we have already create the dynamic reloc section. | |
807 | this->rel_dyn_section(layout); | |
808 | this->rel_irelative_ = new Reloc_section(false); | |
809 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
810 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
811 | ORDER_DYNAMIC_RELOCS, false); | |
812 | gold_assert(this->rel_dyn_->output_section() | |
813 | == this->rel_irelative_->output_section()); | |
814 | } | |
815 | return this->rel_irelative_; | |
816 | } | |
817 | ||
a3ad94ed ILT |
818 | // Create the PLT section. The ordinary .got section is an argument, |
819 | // since we need to refer to the start. We also create our own .got | |
820 | // section just for PLT entries. | |
821 | ||
67181c72 ILT |
822 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
823 | Output_data_space* got_plt, | |
824 | Output_data_space* got_irelative) | |
825 | : Output_section_data(16), tls_desc_rel_(NULL), irelative_rel_(NULL), | |
826 | got_plt_(got_plt), got_irelative_(got_irelative), count_(0), | |
827 | irelative_count_(0), global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 828 | { |
d98bc257 | 829 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 830 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
831 | elfcpp::SHF_ALLOC, this->rel_, |
832 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca | 833 | |
07a60597 ILT |
834 | // Add unwind information if requested. |
835 | if (parameters->options().ld_generated_unwind_info()) | |
836 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
837 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
a3ad94ed ILT |
838 | } |
839 | ||
16649710 ILT |
840 | void |
841 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
842 | { | |
843 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
844 | // linker, and so do we. | |
845 | os->set_entsize(4); | |
846 | } | |
847 | ||
a3ad94ed ILT |
848 | // Add an entry to the PLT. |
849 | ||
850 | void | |
67181c72 ILT |
851 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
852 | Symbol* gsym) | |
a3ad94ed ILT |
853 | { |
854 | gold_assert(!gsym->has_plt_offset()); | |
855 | ||
a3ad94ed | 856 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
857 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
858 | && gsym->can_use_relative_reloc(false)) | |
859 | { | |
67181c72 ILT |
860 | gsym->set_plt_offset(this->irelative_count_ * plt_entry_size); |
861 | ++this->irelative_count_; | |
862 | section_offset_type got_offset = | |
863 | this->got_irelative_->current_data_size(); | |
864 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
865 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
866 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
867 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
868 | struct Global_ifunc gi; |
869 | gi.sym = gsym; | |
870 | gi.got_offset = got_offset; | |
871 | this->global_ifuncs_.push_back(gi); | |
872 | } | |
873 | else | |
874 | { | |
67181c72 ILT |
875 | // When setting the PLT offset we skip the initial reserved PLT |
876 | // entry. | |
877 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
878 | ||
879 | ++this->count_; | |
880 | ||
881 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
882 | ||
883 | // Every PLT entry needs a GOT entry which points back to the | |
884 | // PLT entry (this will be changed by the dynamic linker, | |
885 | // normally lazily when the function is called). | |
886 | this->got_plt_->set_current_data_size(got_offset + 4); | |
887 | ||
7223e9ca ILT |
888 | gsym->set_needs_dynsym_entry(); |
889 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
890 | got_offset); | |
891 | } | |
a3ad94ed ILT |
892 | |
893 | // Note that we don't need to save the symbol. The contents of the | |
894 | // PLT are independent of which symbols are used. The symbols only | |
895 | // appear in the relocations. | |
896 | } | |
897 | ||
7223e9ca ILT |
898 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
899 | // the PLT offset. | |
900 | ||
901 | unsigned int | |
6fa2a40b | 902 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
903 | Symbol_table* symtab, |
904 | Layout* layout, | |
6fa2a40b CC |
905 | Sized_relobj_file<32, false>* relobj, |
906 | unsigned int local_sym_index) | |
7223e9ca | 907 | { |
67181c72 ILT |
908 | unsigned int plt_offset = this->irelative_count_ * plt_entry_size; |
909 | ++this->irelative_count_; | |
7223e9ca | 910 | |
67181c72 | 911 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
912 | |
913 | // Every PLT entry needs a GOT entry which points back to the PLT | |
914 | // entry. | |
67181c72 | 915 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
916 | |
917 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
918 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
919 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
920 | elfcpp::R_386_IRELATIVE, | |
921 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
922 | |
923 | struct Local_ifunc li; | |
924 | li.object = relobj; | |
925 | li.local_sym_index = local_sym_index; | |
926 | li.got_offset = got_offset; | |
927 | this->local_ifuncs_.push_back(li); | |
928 | ||
929 | return plt_offset; | |
930 | } | |
931 | ||
e291e7b9 ILT |
932 | // Return where the TLS_DESC relocations should go, creating it if |
933 | // necessary. These follow the JUMP_SLOT relocations. | |
934 | ||
935 | Output_data_plt_i386::Reloc_section* | |
936 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
937 | { | |
938 | if (this->tls_desc_rel_ == NULL) | |
939 | { | |
940 | this->tls_desc_rel_ = new Reloc_section(false); | |
941 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
942 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 943 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
944 | gold_assert(this->tls_desc_rel_->output_section() |
945 | == this->rel_->output_section()); | |
e291e7b9 ILT |
946 | } |
947 | return this->tls_desc_rel_; | |
948 | } | |
949 | ||
67181c72 ILT |
950 | // Return where the IRELATIVE relocations should go in the PLT. These |
951 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
952 | ||
953 | Output_data_plt_i386::Reloc_section* | |
954 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
955 | { | |
956 | if (this->irelative_rel_ == NULL) | |
957 | { | |
958 | // Make sure we have a place for the TLS_DESC relocations, in | |
959 | // case we see any later on. | |
960 | this->rel_tls_desc(layout); | |
961 | this->irelative_rel_ = new Reloc_section(false); | |
962 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
963 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
964 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
965 | gold_assert(this->irelative_rel_->output_section() | |
966 | == this->rel_->output_section()); | |
967 | ||
968 | if (parameters->doing_static_link()) | |
969 | { | |
970 | // A statically linked executable will only have a .rel.plt | |
971 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
972 | // symbols. The library will use these symbols to locate | |
973 | // the IRELATIVE relocs at program startup time. | |
974 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
975 | Symbol_table::PREDEFINED, | |
976 | this->irelative_rel_, 0, 0, | |
977 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
978 | elfcpp::STV_HIDDEN, 0, false, true); | |
979 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
980 | Symbol_table::PREDEFINED, | |
981 | this->irelative_rel_, 0, 0, | |
982 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
983 | elfcpp::STV_HIDDEN, 0, true, true); | |
984 | } | |
985 | } | |
986 | return this->irelative_rel_; | |
987 | } | |
988 | ||
989 | // Return the PLT address to use for a global symbol. | |
990 | ||
991 | uint64_t | |
992 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
993 | { | |
994 | uint64_t offset = 0; | |
995 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
996 | && gsym->can_use_relative_reloc(false)) | |
997 | offset = (this->count_ + 1) * plt_entry_size; | |
998 | return this->address() + offset; | |
999 | } | |
1000 | ||
1001 | // Return the PLT address to use for a local symbol. These are always | |
1002 | // IRELATIVE relocs. | |
1003 | ||
1004 | uint64_t | |
1005 | Output_data_plt_i386::address_for_local(const Relobj*, unsigned int) | |
1006 | { | |
1007 | return this->address() + (this->count_ + 1) * plt_entry_size; | |
1008 | } | |
1009 | ||
a3ad94ed ILT |
1010 | // The first entry in the PLT for an executable. |
1011 | ||
07a60597 | 1012 | const unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1013 | { |
1014 | 0xff, 0x35, // pushl contents of memory address | |
1015 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1016 | 0xff, 0x25, // jmp indirect | |
1017 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1018 | 0, 0, 0, 0 // unused | |
1019 | }; | |
1020 | ||
1021 | // The first entry in the PLT for a shared object. | |
1022 | ||
07a60597 | 1023 | const unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1024 | { |
1025 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1026 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1027 | 0, 0, 0, 0 // unused | |
1028 | }; | |
1029 | ||
1030 | // Subsequent entries in the PLT for an executable. | |
1031 | ||
07a60597 | 1032 | const unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1033 | { |
1034 | 0xff, 0x25, // jmp indirect | |
1035 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1036 | 0x68, // pushl immediate | |
1037 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1038 | 0xe9, // jmp relative | |
1039 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1040 | }; | |
1041 | ||
1042 | // Subsequent entries in the PLT for a shared object. | |
1043 | ||
07a60597 | 1044 | const unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1045 | { |
1046 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1047 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1048 | 0x68, // pushl immediate | |
1049 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1050 | 0xe9, // jmp relative | |
1051 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1052 | }; | |
1053 | ||
07a60597 ILT |
1054 | // The .eh_frame unwind information for the PLT. |
1055 | ||
1056 | const unsigned char | |
1057 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1058 | { | |
1059 | 1, // CIE version. | |
1060 | 'z', // Augmentation: augmentation size included. | |
1061 | 'R', // Augmentation: FDE encoding included. | |
1062 | '\0', // End of augmentation string. | |
1063 | 1, // Code alignment factor. | |
1064 | 0x7c, // Data alignment factor. | |
1065 | 8, // Return address column. | |
1066 | 1, // Augmentation size. | |
1067 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1068 | | elfcpp::DW_EH_PE_sdata4), | |
1069 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1070 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1071 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1072 | elfcpp::DW_CFA_nop | |
1073 | }; | |
1074 | ||
1075 | const unsigned char | |
1076 | Output_data_plt_i386::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
1077 | { | |
1078 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1079 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1080 | 0, // Augmentation size. | |
1081 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1082 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1083 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1084 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1085 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1086 | 11, // Block length. | |
1087 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1088 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1089 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1090 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1091 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1092 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1093 | elfcpp::DW_OP_lit2, // Push 2. | |
1094 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1095 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1096 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1097 | elfcpp::DW_CFA_nop, | |
1098 | elfcpp::DW_CFA_nop, | |
1099 | elfcpp::DW_CFA_nop | |
1100 | }; | |
1101 | ||
a3ad94ed ILT |
1102 | // Write out the PLT. This uses the hand-coded instructions above, |
1103 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1104 | // Processor Supplement. | |
1105 | ||
1106 | void | |
1107 | Output_data_plt_i386::do_write(Output_file* of) | |
1108 | { | |
2ea97941 | 1109 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1110 | const section_size_type oview_size = |
1111 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1112 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1113 | |
1114 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1115 | gold_assert(parameters->incremental_update() |
1116 | || (got_file_offset + this->got_plt_->data_size() | |
1117 | == this->got_irelative_->offset())); | |
fe8718a4 | 1118 | const section_size_type got_size = |
67181c72 ILT |
1119 | convert_to_section_size_type(this->got_plt_->data_size() |
1120 | + this->got_irelative_->data_size()); | |
a3ad94ed ILT |
1121 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1122 | got_size); | |
1123 | ||
1124 | unsigned char* pov = oview; | |
1125 | ||
1126 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1127 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1128 | ||
374ad285 | 1129 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1130 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
1131 | else | |
1132 | { | |
1133 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
1134 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1135 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1136 | } | |
1137 | pov += plt_entry_size; | |
1138 | ||
1139 | unsigned char* got_pov = got_view; | |
1140 | ||
1141 | memset(got_pov, 0, 12); | |
1142 | got_pov += 12; | |
1143 | ||
1144 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1145 | ||
1146 | unsigned int plt_offset = plt_entry_size; | |
1147 | unsigned int plt_rel_offset = 0; | |
1148 | unsigned int got_offset = 12; | |
67181c72 | 1149 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1150 | for (unsigned int i = 0; |
1151 | i < count; | |
1152 | ++i, | |
1153 | pov += plt_entry_size, | |
1154 | got_pov += 4, | |
1155 | plt_offset += plt_entry_size, | |
1156 | plt_rel_offset += rel_size, | |
1157 | got_offset += 4) | |
1158 | { | |
1159 | // Set and adjust the PLT entry itself. | |
1160 | ||
374ad285 | 1161 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1162 | { |
1163 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
1164 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1165 | } | |
1166 | else | |
1167 | { | |
1168 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
1169 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1170 | (got_address | |
1171 | + got_offset)); | |
1172 | } | |
1173 | ||
1174 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1175 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1176 | - (plt_offset + plt_entry_size)); | |
1177 | ||
1178 | // Set the entry in the GOT. | |
1179 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1180 | } | |
1181 | ||
7223e9ca ILT |
1182 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1183 | // the GOT to point to the actual symbol value, rather than point to | |
1184 | // the PLT entry. That will let the dynamic linker call the right | |
1185 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1186 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1187 | for (std::vector<Global_ifunc>::const_iterator p = |
1188 | this->global_ifuncs_.begin(); | |
1189 | p != this->global_ifuncs_.end(); | |
1190 | ++p) | |
1191 | { | |
1192 | const Sized_symbol<32>* ssym = | |
1193 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1194 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1195 | ssym->value()); |
1196 | } | |
1197 | ||
1198 | for (std::vector<Local_ifunc>::const_iterator p = | |
1199 | this->local_ifuncs_.begin(); | |
1200 | p != this->local_ifuncs_.end(); | |
1201 | ++p) | |
1202 | { | |
1203 | const Symbol_value<32>* psymval = | |
1204 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1205 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1206 | psymval->value(p->object, 0)); |
1207 | } | |
1208 | ||
fe8718a4 ILT |
1209 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1210 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1211 | |
2ea97941 | 1212 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1213 | of->write_output_view(got_file_offset, got_size, got_view); |
1214 | } | |
1215 | ||
7223e9ca | 1216 | // Create the PLT section. |
a3ad94ed ILT |
1217 | |
1218 | void | |
7223e9ca | 1219 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1220 | { |
a3ad94ed ILT |
1221 | if (this->plt_ == NULL) |
1222 | { | |
1223 | // Create the GOT sections first. | |
7e1edb90 | 1224 | this->got_section(symtab, layout); |
a3ad94ed | 1225 | |
67181c72 ILT |
1226 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_, |
1227 | this->got_irelative_); | |
16649710 ILT |
1228 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1229 | (elfcpp::SHF_ALLOC | |
1230 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1231 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1232 | |
1233 | // Make the sh_info field of .rel.plt point to .plt. | |
1234 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1235 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1236 | } |
7223e9ca | 1237 | } |
a3ad94ed | 1238 | |
7223e9ca ILT |
1239 | // Create a PLT entry for a global symbol. |
1240 | ||
1241 | void | |
1242 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1243 | { | |
1244 | if (gsym->has_plt_offset()) | |
1245 | return; | |
1246 | if (this->plt_ == NULL) | |
1247 | this->make_plt_section(symtab, layout); | |
67181c72 | 1248 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1249 | } |
1250 | ||
7223e9ca ILT |
1251 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1252 | ||
1253 | void | |
1254 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1255 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1256 | unsigned int local_sym_index) |
1257 | { | |
1258 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1259 | return; | |
1260 | if (this->plt_ == NULL) | |
1261 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1262 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1263 | relobj, | |
7223e9ca ILT |
1264 | local_sym_index); |
1265 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1266 | } | |
1267 | ||
0e70b911 CC |
1268 | // Return the number of entries in the PLT. |
1269 | ||
1270 | unsigned int | |
1271 | Target_i386::plt_entry_count() const | |
1272 | { | |
1273 | if (this->plt_ == NULL) | |
1274 | return 0; | |
1275 | return this->plt_->entry_count(); | |
1276 | } | |
1277 | ||
1278 | // Return the offset of the first non-reserved PLT entry. | |
1279 | ||
1280 | unsigned int | |
1281 | Target_i386::first_plt_entry_offset() const | |
1282 | { | |
1283 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1284 | } | |
1285 | ||
1286 | // Return the size of each PLT entry. | |
1287 | ||
1288 | unsigned int | |
1289 | Target_i386::plt_entry_size() const | |
1290 | { | |
1291 | return Output_data_plt_i386::get_plt_entry_size(); | |
1292 | } | |
1293 | ||
e291e7b9 ILT |
1294 | // Get the section to use for TLS_DESC relocations. |
1295 | ||
1296 | Target_i386::Reloc_section* | |
1297 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1298 | { | |
1299 | return this->plt_section()->rel_tls_desc(layout); | |
1300 | } | |
1301 | ||
9fa33bee | 1302 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1303 | |
1304 | void | |
1305 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1306 | { | |
1307 | if (this->tls_base_symbol_defined_) | |
1308 | return; | |
1309 | ||
1310 | Output_segment* tls_segment = layout->tls_segment(); | |
1311 | if (tls_segment != NULL) | |
1312 | { | |
183fd0e3 | 1313 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1314 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1315 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1316 | tls_segment, 0, 0, |
1317 | elfcpp::STT_TLS, | |
1318 | elfcpp::STB_LOCAL, | |
1319 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1320 | (is_exec |
1321 | ? Symbol::SEGMENT_END | |
1322 | : Symbol::SEGMENT_START), | |
1323 | true); | |
edfbb029 CC |
1324 | } |
1325 | this->tls_base_symbol_defined_ = true; | |
1326 | } | |
1327 | ||
94c4710f ILT |
1328 | // Create a GOT entry for the TLS module index. |
1329 | ||
1330 | unsigned int | |
1331 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1332 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1333 | { |
1334 | if (this->got_mod_index_offset_ == -1U) | |
1335 | { | |
1336 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1337 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1338 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1339 | unsigned int got_offset = got->add_constant(0); | |
1340 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1341 | got_offset); | |
009a67a2 | 1342 | got->add_constant(0); |
94c4710f ILT |
1343 | this->got_mod_index_offset_ = got_offset; |
1344 | } | |
1345 | return this->got_mod_index_offset_; | |
1346 | } | |
1347 | ||
92e059d8 | 1348 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1349 | // symbol. IS_FINAL is true if the final address of this symbol is |
1350 | // known at link time. | |
92e059d8 | 1351 | |
af6359d5 | 1352 | tls::Tls_optimization |
7e1edb90 | 1353 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1354 | { |
1355 | // If we are generating a shared library, then we can't do anything | |
1356 | // in the linker. | |
8851ecca | 1357 | if (parameters->options().shared()) |
af6359d5 | 1358 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1359 | |
1360 | switch (r_type) | |
1361 | { | |
1362 | case elfcpp::R_386_TLS_GD: | |
1363 | case elfcpp::R_386_TLS_GOTDESC: | |
1364 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1365 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1366 | // access. Since we know that we are generating an executable, |
1367 | // we can convert this to Initial-Exec. If we also know that | |
1368 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1369 | if (is_final) |
af6359d5 ILT |
1370 | return tls::TLSOPT_TO_LE; |
1371 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1372 | |
1373 | case elfcpp::R_386_TLS_LDM: | |
1374 | // This is Local-Dynamic, which refers to a local symbol in the | |
1375 | // dynamic TLS block. Since we know that we generating an | |
1376 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1377 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1378 | |
1379 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1380 | // Another type of Local-Dynamic relocation. |
1381 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1382 | |
1383 | case elfcpp::R_386_TLS_IE: | |
1384 | case elfcpp::R_386_TLS_GOTIE: | |
1385 | case elfcpp::R_386_TLS_IE_32: | |
1386 | // These are Initial-Exec relocs which get the thread offset | |
1387 | // from the GOT. If we know that we are linking against the | |
1388 | // local symbol, we can switch to Local-Exec, which links the | |
1389 | // thread offset into the instruction. | |
a3ad94ed | 1390 | if (is_final) |
af6359d5 ILT |
1391 | return tls::TLSOPT_TO_LE; |
1392 | return tls::TLSOPT_NONE; | |
8462ae85 | 1393 | |
92e059d8 ILT |
1394 | case elfcpp::R_386_TLS_LE: |
1395 | case elfcpp::R_386_TLS_LE_32: | |
1396 | // When we already have Local-Exec, there is nothing further we | |
1397 | // can do. | |
af6359d5 | 1398 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1399 | |
1400 | default: | |
a3ad94ed | 1401 | gold_unreachable(); |
92e059d8 ILT |
1402 | } |
1403 | } | |
1404 | ||
95a2c8d6 | 1405 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1406 | |
95a2c8d6 RS |
1407 | int |
1408 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1409 | { |
1410 | switch (r_type) | |
1411 | { | |
1412 | case elfcpp::R_386_NONE: | |
1413 | case elfcpp::R_386_GNU_VTINHERIT: | |
1414 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1415 | case elfcpp::R_386_GOTPC: |
1416 | // No symbol reference. | |
1417 | return 0; | |
7223e9ca ILT |
1418 | |
1419 | case elfcpp::R_386_32: | |
1420 | case elfcpp::R_386_16: | |
1421 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1422 | return Symbol::ABSOLUTE_REF; |
1423 | ||
7223e9ca ILT |
1424 | case elfcpp::R_386_PC32: |
1425 | case elfcpp::R_386_PC16: | |
1426 | case elfcpp::R_386_PC8: | |
7223e9ca | 1427 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1428 | return Symbol::RELATIVE_REF; |
1429 | ||
1430 | case elfcpp::R_386_PLT32: | |
1431 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1432 | ||
7223e9ca | 1433 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1434 | // Absolute in GOT. |
1435 | return Symbol::ABSOLUTE_REF; | |
1436 | ||
1437 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1438 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1439 | case elfcpp::R_386_TLS_DESC_CALL: | |
1440 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1441 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1442 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1443 | case elfcpp::R_386_TLS_IE_32: | |
1444 | case elfcpp::R_386_TLS_GOTIE: | |
1445 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1446 | case elfcpp::R_386_TLS_LE_32: | |
1447 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1448 | |
1449 | case elfcpp::R_386_COPY: | |
1450 | case elfcpp::R_386_GLOB_DAT: | |
1451 | case elfcpp::R_386_JUMP_SLOT: | |
1452 | case elfcpp::R_386_RELATIVE: | |
1453 | case elfcpp::R_386_IRELATIVE: | |
1454 | case elfcpp::R_386_TLS_TPOFF: | |
1455 | case elfcpp::R_386_TLS_DTPMOD32: | |
1456 | case elfcpp::R_386_TLS_DTPOFF32: | |
1457 | case elfcpp::R_386_TLS_TPOFF32: | |
1458 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1459 | case elfcpp::R_386_32PLT: |
1460 | case elfcpp::R_386_TLS_GD_32: | |
1461 | case elfcpp::R_386_TLS_GD_PUSH: | |
1462 | case elfcpp::R_386_TLS_GD_CALL: | |
1463 | case elfcpp::R_386_TLS_GD_POP: | |
1464 | case elfcpp::R_386_TLS_LDM_32: | |
1465 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1466 | case elfcpp::R_386_TLS_LDM_CALL: | |
1467 | case elfcpp::R_386_TLS_LDM_POP: | |
1468 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1469 | default: | |
95a2c8d6 RS |
1470 | // Not expected. We will give an error later. |
1471 | return 0; | |
7223e9ca ILT |
1472 | } |
1473 | } | |
1474 | ||
95a2c8d6 RS |
1475 | // Report an unsupported relocation against a local symbol. |
1476 | ||
1477 | void | |
6fa2a40b | 1478 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1479 | unsigned int r_type) |
1480 | { | |
1481 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1482 | object->name().c_str(), r_type); | |
1483 | } | |
1484 | ||
1485 | // Return whether we need to make a PLT entry for a relocation of a | |
1486 | // given type against a STT_GNU_IFUNC symbol. | |
1487 | ||
1488 | bool | |
6fa2a40b CC |
1489 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1490 | Sized_relobj_file<32, false>* object, | |
1491 | unsigned int r_type) | |
95a2c8d6 RS |
1492 | { |
1493 | int flags = Scan::get_reference_flags(r_type); | |
1494 | if (flags & Symbol::TLS_REF) | |
1495 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1496 | object->name().c_str(), r_type); | |
1497 | return flags != 0; | |
1498 | } | |
1499 | ||
92e059d8 ILT |
1500 | // Scan a relocation for a local symbol. |
1501 | ||
1502 | inline void | |
ad0f2072 | 1503 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1504 | Layout* layout, |
1505 | Target_i386* target, | |
6fa2a40b | 1506 | Sized_relobj_file<32, false>* object, |
1b64748b | 1507 | unsigned int data_shndx, |
07f397ab | 1508 | Output_section* output_section, |
1b64748b | 1509 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1510 | unsigned int r_type, |
7bf1f802 | 1511 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1512 | { |
7223e9ca ILT |
1513 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1514 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1515 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1516 | { | |
1517 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1518 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1519 | } | |
1520 | ||
92e059d8 ILT |
1521 | switch (r_type) |
1522 | { | |
1523 | case elfcpp::R_386_NONE: | |
1524 | case elfcpp::R_386_GNU_VTINHERIT: | |
1525 | case elfcpp::R_386_GNU_VTENTRY: | |
1526 | break; | |
1527 | ||
1528 | case elfcpp::R_386_32: | |
436ca963 ILT |
1529 | // If building a shared library (or a position-independent |
1530 | // executable), we need to create a dynamic relocation for | |
1531 | // this location. The relocation applied at link time will | |
1532 | // apply the link-time value, so we flag the location with | |
1533 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1534 | // relocate it easily. | |
8851ecca | 1535 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1536 | { |
1537 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1538 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1539 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1540 | output_section, data_shndx, | |
1541 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1542 | } |
1543 | break; | |
1544 | ||
1545 | case elfcpp::R_386_16: | |
1546 | case elfcpp::R_386_8: | |
1547 | // If building a shared library (or a position-independent | |
1548 | // executable), we need to create a dynamic relocation for | |
1549 | // this location. Because the addend needs to remain in the | |
1550 | // data section, we need to be careful not to apply this | |
1551 | // relocation statically. | |
8851ecca | 1552 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1553 | { |
1554 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1555 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1556 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1557 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1558 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1559 | else |
1560 | { | |
1561 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1562 | unsigned int shndx = lsym.get_st_shndx(); |
1563 | bool is_ordinary; | |
1564 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1565 | &is_ordinary); | |
1566 | if (!is_ordinary) | |
1567 | object->error(_("section symbol %u has bad shndx %u"), | |
1568 | r_sym, shndx); | |
1569 | else | |
1570 | rel_dyn->add_local_section(object, shndx, | |
1571 | r_type, output_section, | |
1572 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1573 | } |
436ca963 | 1574 | } |
92e059d8 ILT |
1575 | break; |
1576 | ||
1577 | case elfcpp::R_386_PC32: | |
1578 | case elfcpp::R_386_PC16: | |
1579 | case elfcpp::R_386_PC8: | |
1580 | break; | |
1581 | ||
df2efe71 ILT |
1582 | case elfcpp::R_386_PLT32: |
1583 | // Since we know this is a local symbol, we can handle this as a | |
1584 | // PC32 reloc. | |
1585 | break; | |
1586 | ||
ead1e424 ILT |
1587 | case elfcpp::R_386_GOTOFF: |
1588 | case elfcpp::R_386_GOTPC: | |
1589 | // We need a GOT section. | |
7e1edb90 | 1590 | target->got_section(symtab, layout); |
ead1e424 ILT |
1591 | break; |
1592 | ||
1b64748b ILT |
1593 | case elfcpp::R_386_GOT32: |
1594 | { | |
1595 | // The symbol requires a GOT entry. | |
1596 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1597 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1598 | |
1599 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1600 | // lets function pointers compare correctly with shared | |
1601 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1602 | bool is_new; | |
1603 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1604 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1605 | else | |
1606 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1607 | if (is_new) | |
1b64748b ILT |
1608 | { |
1609 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1610 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1611 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1612 | { |
1613 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1614 | unsigned int got_offset = |
1615 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1616 | rel_dyn->add_local_relative(object, r_sym, | |
1617 | elfcpp::R_386_RELATIVE, | |
1618 | got, got_offset); | |
1b64748b ILT |
1619 | } |
1620 | } | |
1621 | } | |
1622 | break; | |
1623 | ||
af6359d5 ILT |
1624 | // These are relocations which should only be seen by the |
1625 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1626 | case elfcpp::R_386_COPY: |
1627 | case elfcpp::R_386_GLOB_DAT: | |
1628 | case elfcpp::R_386_JUMP_SLOT: | |
1629 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1630 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1631 | case elfcpp::R_386_TLS_TPOFF: |
1632 | case elfcpp::R_386_TLS_DTPMOD32: | |
1633 | case elfcpp::R_386_TLS_DTPOFF32: | |
1634 | case elfcpp::R_386_TLS_TPOFF32: | |
1635 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1636 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1637 | object->name().c_str(), r_type); |
92e059d8 ILT |
1638 | break; |
1639 | ||
af6359d5 | 1640 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1641 | // linking. |
56622147 ILT |
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 | |
92e059d8 | 1648 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1649 | case elfcpp::R_386_TLS_GOTIE: |
1650 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1651 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1652 | { |
8851ecca | 1653 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1654 | const tls::Tls_optimization optimized_type |
1655 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1656 | switch (r_type) |
1657 | { | |
56622147 | 1658 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1659 | if (optimized_type == tls::TLSOPT_NONE) |
1660 | { | |
1661 | // Create a pair of GOT entries for the module index and | |
1662 | // dtv-relative offset. | |
1663 | Output_data_got<32, false>* got | |
1664 | = target->got_section(symtab, layout); | |
1665 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1666 | unsigned int shndx = lsym.get_st_shndx(); |
1667 | bool is_ordinary; | |
1668 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1669 | if (!is_ordinary) | |
1670 | object->error(_("local symbol %u has bad shndx %u"), | |
1671 | r_sym, shndx); | |
1672 | else | |
1673 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1674 | GOT_TYPE_TLS_PAIR, | |
1675 | target->rel_dyn_section(layout), | |
1676 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1677 | } |
1678 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1679 | unsupported_reloc_local(object, r_type); | |
1680 | break; | |
1681 | ||
56622147 | 1682 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1683 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1684 | if (optimized_type == tls::TLSOPT_NONE) |
1685 | { | |
a8df5856 ILT |
1686 | // Create a double GOT entry with an R_386_TLS_DESC |
1687 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1688 | // lazily, so the GOT entry needs to be in an area in | |
1689 | // .got.plt, not .got. Call got_section to make sure | |
1690 | // the section has been created. | |
1691 | target->got_section(symtab, layout); | |
1692 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1693 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1694 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1695 | { | |
1696 | unsigned int got_offset = got->add_constant(0); | |
1697 | // The local symbol value is stored in the second | |
1698 | // GOT entry. | |
1699 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1700 | // That set the GOT offset of the local symbol to | |
1701 | // point to the second entry, but we want it to | |
1702 | // point to the first. | |
1703 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1704 | got_offset); | |
1705 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1706 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1707 | } | |
c2b45e22 CC |
1708 | } |
1709 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1710 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1711 | break; |
1712 | ||
c2b45e22 CC |
1713 | case elfcpp::R_386_TLS_DESC_CALL: |
1714 | break; | |
1715 | ||
56622147 | 1716 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1717 | if (optimized_type == tls::TLSOPT_NONE) |
1718 | { | |
1719 | // Create a GOT entry for the module index. | |
94c4710f | 1720 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1721 | } |
1722 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1723 | unsupported_reloc_local(object, r_type); |
1724 | break; | |
1725 | ||
56622147 | 1726 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1727 | break; |
1728 | ||
56622147 ILT |
1729 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1730 | case elfcpp::R_386_TLS_IE_32: | |
1731 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1732 | layout->set_has_static_tls(); |
07f397ab ILT |
1733 | if (optimized_type == tls::TLSOPT_NONE) |
1734 | { | |
7bf1f802 ILT |
1735 | // For the R_386_TLS_IE relocation, we need to create a |
1736 | // dynamic relocation when building a shared library. | |
1737 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1738 | && parameters->options().shared()) |
7bf1f802 ILT |
1739 | { |
1740 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1741 | unsigned int r_sym |
1742 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1743 | rel_dyn->add_local_relative(object, r_sym, | |
1744 | elfcpp::R_386_RELATIVE, | |
1745 | output_section, data_shndx, | |
1746 | reloc.get_r_offset()); | |
7bf1f802 | 1747 | } |
07f397ab ILT |
1748 | // Create a GOT entry for the tp-relative offset. |
1749 | Output_data_got<32, false>* got | |
1750 | = target->got_section(symtab, layout); | |
1751 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1752 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1753 | ? elfcpp::R_386_TLS_TPOFF32 | |
1754 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1755 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1756 | ? GOT_TYPE_TLS_OFFSET | |
1757 | : GOT_TYPE_TLS_NOFFSET); | |
1758 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1759 | target->rel_dyn_section(layout), |
1760 | dyn_r_type); | |
07f397ab ILT |
1761 | } |
1762 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1763 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1764 | break; |
af6359d5 | 1765 | |
56622147 ILT |
1766 | case elfcpp::R_386_TLS_LE: // Local-exec |
1767 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1768 | layout->set_has_static_tls(); |
07f397ab | 1769 | if (output_is_shared) |
7bf1f802 ILT |
1770 | { |
1771 | // We need to create a dynamic relocation. | |
dceae3c1 | 1772 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1773 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1774 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1775 | ? elfcpp::R_386_TLS_TPOFF32 | |
1776 | : elfcpp::R_386_TLS_TPOFF); | |
1777 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1778 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1779 | data_shndx, reloc.get_r_offset()); | |
1780 | } | |
56622147 ILT |
1781 | break; |
1782 | ||
af6359d5 ILT |
1783 | default: |
1784 | gold_unreachable(); | |
7e1edb90 ILT |
1785 | } |
1786 | } | |
92e059d8 ILT |
1787 | break; |
1788 | ||
92e059d8 ILT |
1789 | case elfcpp::R_386_32PLT: |
1790 | case elfcpp::R_386_TLS_GD_32: | |
1791 | case elfcpp::R_386_TLS_GD_PUSH: | |
1792 | case elfcpp::R_386_TLS_GD_CALL: | |
1793 | case elfcpp::R_386_TLS_GD_POP: | |
1794 | case elfcpp::R_386_TLS_LDM_32: | |
1795 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1796 | case elfcpp::R_386_TLS_LDM_CALL: | |
1797 | case elfcpp::R_386_TLS_LDM_POP: | |
1798 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1799 | default: | |
af6359d5 | 1800 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1801 | break; |
1802 | } | |
1803 | } | |
1804 | ||
af6359d5 ILT |
1805 | // Report an unsupported relocation against a global symbol. |
1806 | ||
1807 | void | |
6fa2a40b CC |
1808 | Target_i386::Scan::unsupported_reloc_global( |
1809 | Sized_relobj_file<32, false>* object, | |
1810 | unsigned int r_type, | |
1811 | Symbol* gsym) | |
af6359d5 | 1812 | { |
75f2446e | 1813 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1814 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1815 | } |
1816 | ||
0897ed3b ST |
1817 | inline bool |
1818 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1819 | { | |
1820 | switch (r_type) | |
1821 | { | |
1822 | case elfcpp::R_386_32: | |
1823 | case elfcpp::R_386_16: | |
1824 | case elfcpp::R_386_8: | |
1825 | case elfcpp::R_386_GOTOFF: | |
1826 | case elfcpp::R_386_GOT32: | |
1827 | { | |
1828 | return true; | |
1829 | } | |
1830 | default: | |
1831 | return false; | |
1832 | } | |
1833 | return false; | |
1834 | } | |
1835 | ||
1836 | inline bool | |
1837 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1838 | Symbol_table* , | |
1839 | Layout* , | |
1840 | Target_i386* , | |
6fa2a40b | 1841 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1842 | unsigned int , |
1843 | Output_section* , | |
1844 | const elfcpp::Rel<32, false>& , | |
1845 | unsigned int r_type, | |
1846 | const elfcpp::Sym<32, false>&) | |
1847 | { | |
1848 | return possible_function_pointer_reloc(r_type); | |
1849 | } | |
1850 | ||
1851 | inline bool | |
1852 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1853 | Symbol_table* , | |
1854 | Layout* , | |
1855 | Target_i386* , | |
6fa2a40b | 1856 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1857 | unsigned int , |
1858 | Output_section* , | |
1859 | const elfcpp::Rel<32, false>& , | |
1860 | unsigned int r_type, | |
1861 | Symbol*) | |
1862 | { | |
1863 | return possible_function_pointer_reloc(r_type); | |
1864 | } | |
1865 | ||
92e059d8 ILT |
1866 | // Scan a relocation for a global symbol. |
1867 | ||
1868 | inline void | |
ad0f2072 | 1869 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1870 | Layout* layout, |
1871 | Target_i386* target, | |
6fa2a40b | 1872 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 1873 | unsigned int data_shndx, |
07f397ab | 1874 | Output_section* output_section, |
a3ad94ed ILT |
1875 | const elfcpp::Rel<32, false>& reloc, |
1876 | unsigned int r_type, | |
92e059d8 ILT |
1877 | Symbol* gsym) |
1878 | { | |
7223e9ca ILT |
1879 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1880 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1881 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1882 | target->make_plt_entry(symtab, layout, gsym); | |
1883 | ||
92e059d8 ILT |
1884 | switch (r_type) |
1885 | { | |
1886 | case elfcpp::R_386_NONE: | |
1887 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1888 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1889 | break; |
1890 | ||
1891 | case elfcpp::R_386_32: | |
92e059d8 | 1892 | case elfcpp::R_386_16: |
92e059d8 | 1893 | case elfcpp::R_386_8: |
96f2030e | 1894 | { |
d61c6bd4 ILT |
1895 | // Make a PLT entry if necessary. |
1896 | if (gsym->needs_plt_entry()) | |
1897 | { | |
1898 | target->make_plt_entry(symtab, layout, gsym); | |
1899 | // Since this is not a PC-relative relocation, we may be | |
1900 | // taking the address of a function. In that case we need to | |
1901 | // set the entry in the dynamic symbol table to the address of | |
1902 | // the PLT entry. | |
8851ecca | 1903 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1904 | gsym->set_needs_dynsym_value(); |
1905 | } | |
1906 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1907 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1908 | { |
966d4097 | 1909 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1910 | { |
12c0daef | 1911 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1912 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1913 | } |
7223e9ca ILT |
1914 | else if (r_type == elfcpp::R_386_32 |
1915 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1916 | && gsym->can_use_relative_reloc(false) | |
1917 | && !gsym->is_from_dynobj() | |
1918 | && !gsym->is_undefined() | |
1919 | && !gsym->is_preemptible()) | |
1920 | { | |
1921 | // Use an IRELATIVE reloc for a locally defined | |
1922 | // STT_GNU_IFUNC symbol. This makes a function | |
1923 | // address in a PIE executable match the address in a | |
1924 | // shared library that it links against. | |
67181c72 | 1925 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
1926 | rel_dyn->add_symbolless_global_addend(gsym, |
1927 | elfcpp::R_386_IRELATIVE, | |
1928 | output_section, | |
1929 | object, data_shndx, | |
1930 | reloc.get_r_offset()); | |
1931 | } | |
d61c6bd4 ILT |
1932 | else if (r_type == elfcpp::R_386_32 |
1933 | && gsym->can_use_relative_reloc(false)) | |
1934 | { | |
1935 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1936 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1937 | output_section, object, | |
1938 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1939 | } |
1940 | else | |
1941 | { | |
96f2030e | 1942 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1943 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1944 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1945 | } |
1946 | } | |
1947 | } | |
1948 | break; | |
1949 | ||
1950 | case elfcpp::R_386_PC32: | |
1951 | case elfcpp::R_386_PC16: | |
1952 | case elfcpp::R_386_PC8: | |
1953 | { | |
1954 | // Make a PLT entry if necessary. | |
1955 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1956 | { |
1957 | // These relocations are used for function calls only in | |
1958 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1959 | // we'll need a text relocation anyway, so we can skip the | |
1960 | // PLT entry and let the dynamic linker bind the call directly | |
1961 | // to the target. For smaller relocations, we should use a | |
1962 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1963 | if (!parameters->options().shared() |
7bf1f802 ILT |
1964 | || r_type != elfcpp::R_386_PC32) |
1965 | target->make_plt_entry(symtab, layout, gsym); | |
1966 | } | |
d61c6bd4 | 1967 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1968 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1969 | { |
966d4097 | 1970 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1971 | { |
12c0daef | 1972 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1973 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1974 | } |
86849f1f | 1975 | else |
d61c6bd4 ILT |
1976 | { |
1977 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1978 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1979 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1980 | } |
96f2030e ILT |
1981 | } |
1982 | } | |
92e059d8 ILT |
1983 | break; |
1984 | ||
ead1e424 | 1985 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1986 | { |
1987 | // The symbol requires a GOT entry. | |
7e1edb90 | 1988 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1989 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1990 | { |
1991 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1992 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1993 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1994 | else | |
1995 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1996 | } | |
7bf1f802 ILT |
1997 | else |
1998 | { | |
8462ae85 | 1999 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
2000 | // GOT entry with a dynamic relocation. |
2001 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2002 | |
2003 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2004 | // | |
2005 | // 1) The symbol may be defined in some other module. | |
2006 | // | |
2007 | // 2) We are building a shared library and this is a | |
2008 | // protected symbol; using GLOB_DAT means that the dynamic | |
2009 | // linker can use the address of the PLT in the main | |
2010 | // executable when appropriate so that function address | |
2011 | // comparisons work. | |
2012 | // | |
2013 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2014 | // code, again so that function address comparisons work. | |
8fc19601 ILT |
2015 | if (gsym->is_from_dynobj() |
2016 | || gsym->is_undefined() | |
7223e9ca | 2017 | || gsym->is_preemptible() |
07aa62f2 ILT |
2018 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2019 | && parameters->options().shared()) | |
7223e9ca ILT |
2020 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2021 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
2022 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2023 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 2024 | else |
8462ae85 | 2025 | { |
7223e9ca ILT |
2026 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2027 | // offset into the GOT, so that function pointer | |
2028 | // comparisons work correctly. | |
2029 | bool is_new; | |
2030 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2031 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2032 | else | |
2033 | { | |
2034 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2035 | // Tell the dynamic linker to use the PLT address | |
2036 | // when resolving relocations. | |
2037 | if (gsym->is_from_dynobj() | |
2038 | && !parameters->options().shared()) | |
2039 | gsym->set_needs_dynsym_value(); | |
2040 | } | |
2041 | if (is_new) | |
2042 | { | |
2043 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2044 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2045 | got, got_off); | |
2046 | } | |
8462ae85 ILT |
2047 | } |
2048 | } | |
2049 | } | |
ead1e424 ILT |
2050 | break; |
2051 | ||
2052 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2053 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2054 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2055 | if (gsym->final_value_is_known()) |
ead1e424 | 2056 | break; |
436ca963 ILT |
2057 | // If building a shared library, we can also skip the PLT entry |
2058 | // if the symbol is defined in the output file and is protected | |
2059 | // or hidden. | |
2060 | if (gsym->is_defined() | |
2061 | && !gsym->is_from_dynobj() | |
2062 | && !gsym->is_preemptible()) | |
2063 | break; | |
7e1edb90 | 2064 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2065 | break; |
2066 | ||
2067 | case elfcpp::R_386_GOTOFF: | |
2068 | case elfcpp::R_386_GOTPC: | |
2069 | // We need a GOT section. | |
7e1edb90 | 2070 | target->got_section(symtab, layout); |
ead1e424 ILT |
2071 | break; |
2072 | ||
af6359d5 ILT |
2073 | // These are relocations which should only be seen by the |
2074 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2075 | case elfcpp::R_386_COPY: |
2076 | case elfcpp::R_386_GLOB_DAT: | |
2077 | case elfcpp::R_386_JUMP_SLOT: | |
2078 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2079 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2080 | case elfcpp::R_386_TLS_TPOFF: |
2081 | case elfcpp::R_386_TLS_DTPMOD32: | |
2082 | case elfcpp::R_386_TLS_DTPOFF32: | |
2083 | case elfcpp::R_386_TLS_TPOFF32: | |
2084 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2085 | gold_error(_("%s: unexpected reloc %u in object file"), |
2086 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2087 | break; |
2088 | ||
d61c17ea ILT |
2089 | // These are initial tls relocs, which are expected when |
2090 | // linking. | |
56622147 ILT |
2091 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2092 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2093 | case elfcpp::R_386_TLS_DESC_CALL: | |
2094 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2095 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2096 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2097 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2098 | case elfcpp::R_386_TLS_GOTIE: |
2099 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2100 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2101 | { |
7e1edb90 | 2102 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
2103 | const tls::Tls_optimization optimized_type |
2104 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
2105 | switch (r_type) |
2106 | { | |
56622147 | 2107 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2108 | if (optimized_type == tls::TLSOPT_NONE) |
2109 | { | |
2110 | // Create a pair of GOT entries for the module index and | |
2111 | // dtv-relative offset. | |
2112 | Output_data_got<32, false>* got | |
2113 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2114 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
2115 | target->rel_dyn_section(layout), |
2116 | elfcpp::R_386_TLS_DTPMOD32, | |
2117 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2118 | } |
2119 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2120 | { | |
2121 | // Create a GOT entry for the tp-relative offset. | |
2122 | Output_data_got<32, false>* got | |
2123 | = target->got_section(symtab, layout); | |
c2b45e22 | 2124 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 2125 | target->rel_dyn_section(layout), |
c2b45e22 | 2126 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
2127 | } |
2128 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2129 | unsupported_reloc_global(object, r_type, gsym); | |
2130 | break; | |
2131 | ||
56622147 | 2132 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2133 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2134 | if (optimized_type == tls::TLSOPT_NONE) |
2135 | { | |
a8df5856 ILT |
2136 | // Create a double GOT entry with an R_386_TLS_DESC |
2137 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2138 | // lazily, so the GOT entry needs to be in an area in | |
2139 | // .got.plt, not .got. Call got_section to make sure | |
2140 | // the section has been created. | |
2141 | target->got_section(symtab, layout); | |
2142 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
2143 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2144 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
2145 | elfcpp::R_386_TLS_DESC, 0); |
2146 | } | |
2147 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2148 | { | |
2149 | // Create a GOT entry for the tp-relative offset. | |
2150 | Output_data_got<32, false>* got | |
2151 | = target->got_section(symtab, layout); | |
2152 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2153 | target->rel_dyn_section(layout), | |
2154 | elfcpp::R_386_TLS_TPOFF); | |
2155 | } | |
2156 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2157 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
2158 | break; |
2159 | ||
2160 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2161 | break; |
2162 | ||
56622147 | 2163 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2164 | if (optimized_type == tls::TLSOPT_NONE) |
2165 | { | |
2166 | // Create a GOT entry for the module index. | |
94c4710f | 2167 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
2168 | } |
2169 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2170 | unsupported_reloc_global(object, r_type, gsym); |
2171 | break; | |
2172 | ||
56622147 | 2173 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2174 | break; |
2175 | ||
56622147 ILT |
2176 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2177 | case elfcpp::R_386_TLS_IE_32: | |
2178 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2179 | layout->set_has_static_tls(); |
07f397ab ILT |
2180 | if (optimized_type == tls::TLSOPT_NONE) |
2181 | { | |
7bf1f802 ILT |
2182 | // For the R_386_TLS_IE relocation, we need to create a |
2183 | // dynamic relocation when building a shared library. | |
2184 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 2185 | && parameters->options().shared()) |
07f397ab | 2186 | { |
07f397ab | 2187 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
2188 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2189 | output_section, object, | |
2190 | data_shndx, | |
2191 | reloc.get_r_offset()); | |
07f397ab | 2192 | } |
7bf1f802 ILT |
2193 | // Create a GOT entry for the tp-relative offset. |
2194 | Output_data_got<32, false>* got | |
2195 | = target->got_section(symtab, layout); | |
2196 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2197 | ? elfcpp::R_386_TLS_TPOFF32 | |
2198 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
2199 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2200 | ? GOT_TYPE_TLS_OFFSET | |
2201 | : GOT_TYPE_TLS_NOFFSET); | |
2202 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
2203 | target->rel_dyn_section(layout), |
2204 | dyn_r_type); | |
07f397ab ILT |
2205 | } |
2206 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2207 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2208 | break; |
af6359d5 | 2209 | |
56622147 ILT |
2210 | case elfcpp::R_386_TLS_LE: // Local-exec |
2211 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2212 | layout->set_has_static_tls(); |
8851ecca | 2213 | if (parameters->options().shared()) |
7bf1f802 ILT |
2214 | { |
2215 | // We need to create a dynamic relocation. | |
2216 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2217 | ? elfcpp::R_386_TLS_TPOFF32 | |
2218 | : elfcpp::R_386_TLS_TPOFF); | |
2219 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2220 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2221 | data_shndx, reloc.get_r_offset()); | |
2222 | } | |
56622147 ILT |
2223 | break; |
2224 | ||
af6359d5 ILT |
2225 | default: |
2226 | gold_unreachable(); | |
a3ad94ed ILT |
2227 | } |
2228 | } | |
92e059d8 ILT |
2229 | break; |
2230 | ||
92e059d8 ILT |
2231 | case elfcpp::R_386_32PLT: |
2232 | case elfcpp::R_386_TLS_GD_32: | |
2233 | case elfcpp::R_386_TLS_GD_PUSH: | |
2234 | case elfcpp::R_386_TLS_GD_CALL: | |
2235 | case elfcpp::R_386_TLS_GD_POP: | |
2236 | case elfcpp::R_386_TLS_LDM_32: | |
2237 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2238 | case elfcpp::R_386_TLS_LDM_CALL: | |
2239 | case elfcpp::R_386_TLS_LDM_POP: | |
2240 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2241 | default: | |
af6359d5 | 2242 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2243 | break; |
2244 | } | |
2245 | } | |
2246 | ||
6d03d481 ST |
2247 | // Process relocations for gc. |
2248 | ||
2249 | void | |
ad0f2072 | 2250 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 2251 | Layout* layout, |
6fa2a40b | 2252 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
2253 | unsigned int data_shndx, |
2254 | unsigned int, | |
2255 | const unsigned char* prelocs, | |
2256 | size_t reloc_count, | |
2257 | Output_section* output_section, | |
2258 | bool needs_special_offset_handling, | |
2259 | size_t local_symbol_count, | |
2260 | const unsigned char* plocal_symbols) | |
2261 | { | |
2262 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2263 | Target_i386::Scan, |
2264 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2265 | symtab, |
2266 | layout, | |
2267 | this, | |
2268 | object, | |
2269 | data_shndx, | |
2270 | prelocs, | |
2271 | reloc_count, | |
2272 | output_section, | |
2273 | needs_special_offset_handling, | |
2274 | local_symbol_count, | |
2275 | plocal_symbols); | |
2276 | } | |
2277 | ||
92e059d8 ILT |
2278 | // Scan relocations for a section. |
2279 | ||
2280 | void | |
ad0f2072 | 2281 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2282 | Layout* layout, |
6fa2a40b | 2283 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 2284 | unsigned int data_shndx, |
92e059d8 ILT |
2285 | unsigned int sh_type, |
2286 | const unsigned char* prelocs, | |
2287 | size_t reloc_count, | |
730cdc88 ILT |
2288 | Output_section* output_section, |
2289 | bool needs_special_offset_handling, | |
92e059d8 | 2290 | size_t local_symbol_count, |
730cdc88 | 2291 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2292 | { |
2293 | if (sh_type == elfcpp::SHT_RELA) | |
2294 | { | |
75f2446e ILT |
2295 | gold_error(_("%s: unsupported RELA reloc section"), |
2296 | object->name().c_str()); | |
2297 | return; | |
92e059d8 ILT |
2298 | } |
2299 | ||
ead1e424 ILT |
2300 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2301 | Target_i386::Scan>( | |
92e059d8 | 2302 | symtab, |
ead1e424 ILT |
2303 | layout, |
2304 | this, | |
92e059d8 | 2305 | object, |
a3ad94ed | 2306 | data_shndx, |
92e059d8 ILT |
2307 | prelocs, |
2308 | reloc_count, | |
730cdc88 ILT |
2309 | output_section, |
2310 | needs_special_offset_handling, | |
92e059d8 | 2311 | local_symbol_count, |
730cdc88 | 2312 | plocal_symbols); |
92e059d8 ILT |
2313 | } |
2314 | ||
16649710 | 2315 | // Finalize the sections. |
5a6f7e2d ILT |
2316 | |
2317 | void | |
f59f41f3 DK |
2318 | Target_i386::do_finalize_sections( |
2319 | Layout* layout, | |
2320 | const Input_objects*, | |
e785ec03 | 2321 | Symbol_table* symtab) |
5a6f7e2d | 2322 | { |
ea715a34 ILT |
2323 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2324 | ? NULL | |
2325 | : this->plt_->rel_plt()); | |
2326 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2327 | this->rel_dyn_, true, false); |
16649710 ILT |
2328 | |
2329 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2330 | // relocs. | |
12c0daef ILT |
2331 | if (this->copy_relocs_.any_saved_relocs()) |
2332 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2333 | |
2334 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2335 | // the .got.plt section. | |
2336 | Symbol* sym = this->global_offset_table_; | |
2337 | if (sym != NULL) | |
2338 | { | |
2339 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2340 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2341 | } | |
28a13fec | 2342 | |
67181c72 ILT |
2343 | if (parameters->doing_static_link() |
2344 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2345 | { |
2346 | // If linking statically, make sure that the __rel_iplt symbols | |
2347 | // were defined if necessary, even if we didn't create a PLT. | |
2348 | static const Define_symbol_in_segment syms[] = | |
2349 | { | |
2350 | { | |
2351 | "__rel_iplt_start", // name | |
2352 | elfcpp::PT_LOAD, // segment_type | |
2353 | elfcpp::PF_W, // segment_flags_set | |
2354 | elfcpp::PF(0), // segment_flags_clear | |
2355 | 0, // value | |
2356 | 0, // size | |
2357 | elfcpp::STT_NOTYPE, // type | |
2358 | elfcpp::STB_GLOBAL, // binding | |
2359 | elfcpp::STV_HIDDEN, // visibility | |
2360 | 0, // nonvis | |
2361 | Symbol::SEGMENT_START, // offset_from_base | |
2362 | true // only_if_ref | |
2363 | }, | |
2364 | { | |
2365 | "__rel_iplt_end", // name | |
2366 | elfcpp::PT_LOAD, // segment_type | |
2367 | elfcpp::PF_W, // segment_flags_set | |
2368 | elfcpp::PF(0), // segment_flags_clear | |
2369 | 0, // value | |
2370 | 0, // size | |
2371 | elfcpp::STT_NOTYPE, // type | |
2372 | elfcpp::STB_GLOBAL, // binding | |
2373 | elfcpp::STV_HIDDEN, // visibility | |
2374 | 0, // nonvis | |
2375 | Symbol::SEGMENT_START, // offset_from_base | |
2376 | true // only_if_ref | |
2377 | } | |
2378 | }; | |
2379 | ||
2380 | symtab->define_symbols(layout, 2, syms, | |
2381 | layout->script_options()->saw_sections_clause()); | |
2382 | } | |
5a6f7e2d ILT |
2383 | } |
2384 | ||
86849f1f ILT |
2385 | // Return whether a direct absolute static relocation needs to be applied. |
2386 | // In cases where Scan::local() or Scan::global() has created | |
2387 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2388 | // of the relocation is carried in the data, and we must not | |
2389 | // apply the static relocation. | |
2390 | ||
2391 | inline bool | |
2392 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2393 | unsigned int r_type, |
031cdbed ILT |
2394 | bool is_32bit, |
2395 | Output_section* output_section) | |
86849f1f | 2396 | { |
031cdbed ILT |
2397 | // If the output section is not allocated, then we didn't call |
2398 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2399 | // the reloc here. | |
2400 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2401 | return true; | |
2402 | ||
95a2c8d6 RS |
2403 | int ref_flags = Scan::get_reference_flags(r_type); |
2404 | ||
d61c6bd4 ILT |
2405 | // For local symbols, we will have created a non-RELATIVE dynamic |
2406 | // relocation only if (a) the output is position independent, | |
2407 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2408 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2409 | if (gsym == NULL) |
8851ecca | 2410 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2411 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2412 | && !is_32bit); |
86849f1f | 2413 | |
0700cf32 ILT |
2414 | // For global symbols, we use the same helper routines used in the |
2415 | // scan pass. If we did not create a dynamic relocation, or if we | |
2416 | // created a RELATIVE dynamic relocation, we should apply the static | |
2417 | // relocation. | |
2418 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2419 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2420 | && gsym->can_use_relative_reloc(ref_flags | |
2421 | & Symbol::FUNCTION_CALL); | |
2422 | return !has_dyn || is_rel; | |
86849f1f ILT |
2423 | } |
2424 | ||
61ba1cf9 ILT |
2425 | // Perform a relocation. |
2426 | ||
ead1e424 | 2427 | inline bool |
92e059d8 | 2428 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2429 | Target_i386* target, |
ca09d69a | 2430 | Output_section* output_section, |
92e059d8 ILT |
2431 | size_t relnum, |
2432 | const elfcpp::Rel<32, false>& rel, | |
2433 | unsigned int r_type, | |
c06b7b0b | 2434 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2435 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2436 | unsigned char* view, |
2437 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2438 | section_size_type view_size) |
61ba1cf9 | 2439 | { |
ead1e424 ILT |
2440 | if (this->skip_call_tls_get_addr_) |
2441 | { | |
5efc7cd2 CC |
2442 | if ((r_type != elfcpp::R_386_PLT32 |
2443 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2444 | || gsym == NULL |
2445 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2446 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2447 | _("missing expected TLS relocation")); | |
2448 | else | |
ead1e424 | 2449 | { |
75f2446e ILT |
2450 | this->skip_call_tls_get_addr_ = false; |
2451 | return false; | |
ead1e424 | 2452 | } |
ead1e424 ILT |
2453 | } |
2454 | ||
6fa2a40b | 2455 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2456 | |
a3ad94ed | 2457 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2458 | Symbol_value<32> symval; |
436ca963 | 2459 | if (gsym != NULL |
7223e9ca ILT |
2460 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2461 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2462 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2463 | && gsym->can_use_relative_reloc(false) |
2464 | && !gsym->is_from_dynobj() | |
2465 | && !gsym->is_undefined() | |
2466 | && !gsym->is_preemptible()) | |
2467 | { | |
2468 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2469 | // want to use the real value of the symbol, not the PLT offset. | |
2470 | } | |
2471 | else if (gsym != NULL | |
95a2c8d6 | 2472 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2473 | { |
67181c72 | 2474 | symval.set_output_value(target->plt_address_for_global(gsym) |
b8e6aad9 ILT |
2475 | + gsym->plt_offset()); |
2476 | psymval = &symval; | |
a3ad94ed | 2477 | } |
7223e9ca ILT |
2478 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2479 | { | |
2480 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2481 | if (object->local_has_plt_offset(r_sym)) | |
2482 | { | |
67181c72 | 2483 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
2484 | + object->local_plt_offset(r_sym)); |
2485 | psymval = &symval; | |
2486 | } | |
2487 | } | |
b8e6aad9 | 2488 | |
1b64748b | 2489 | // Get the GOT offset if needed. |
96f2030e ILT |
2490 | // The GOT pointer points to the end of the GOT section. |
2491 | // We need to subtract the size of the GOT section to get | |
2492 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2493 | bool have_got_offset = false; |
2494 | unsigned int got_offset = 0; | |
2495 | switch (r_type) | |
2496 | { | |
2497 | case elfcpp::R_386_GOT32: | |
2498 | if (gsym != NULL) | |
2499 | { | |
0a65a3a7 CC |
2500 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2501 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2502 | - target->got_size()); | |
1b64748b ILT |
2503 | } |
2504 | else | |
2505 | { | |
2506 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2507 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2508 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2509 | - target->got_size()); | |
1b64748b ILT |
2510 | } |
2511 | have_got_offset = true; | |
2512 | break; | |
2513 | ||
2514 | default: | |
2515 | break; | |
2516 | } | |
2517 | ||
61ba1cf9 ILT |
2518 | switch (r_type) |
2519 | { | |
2520 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2521 | case elfcpp::R_386_GNU_VTINHERIT: |
2522 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2523 | break; |
2524 | ||
2525 | case elfcpp::R_386_32: | |
95a2c8d6 | 2526 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2527 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2528 | break; |
2529 | ||
2530 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2531 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2532 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2533 | break; |
2534 | ||
2535 | case elfcpp::R_386_16: | |
95a2c8d6 | 2536 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2537 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2538 | break; |
2539 | ||
2540 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2541 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2542 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2543 | break; |
2544 | ||
92e059d8 | 2545 | case elfcpp::R_386_8: |
95a2c8d6 | 2546 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2547 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2548 | break; |
2549 | ||
2550 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2551 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2552 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2553 | break; |
2554 | ||
ead1e424 | 2555 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2556 | gold_assert(gsym == NULL |
2557 | || gsym->has_plt_offset() | |
99f8faca ILT |
2558 | || gsym->final_value_is_known() |
2559 | || (gsym->is_defined() | |
2560 | && !gsym->is_from_dynobj() | |
2561 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2562 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2563 | break; |
2564 | ||
2565 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2566 | gold_assert(have_got_offset); |
2567 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2568 | break; |
2569 | ||
2570 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2571 | { |
2572 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2573 | value = (psymval->value(object, 0) | |
96f2030e | 2574 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2575 | Relocate_functions<32, false>::rel32(view, value); |
2576 | } | |
ead1e424 ILT |
2577 | break; |
2578 | ||
2579 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2580 | { |
2581 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2582 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2583 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2584 | } | |
ead1e424 ILT |
2585 | break; |
2586 | ||
92e059d8 ILT |
2587 | case elfcpp::R_386_COPY: |
2588 | case elfcpp::R_386_GLOB_DAT: | |
2589 | case elfcpp::R_386_JUMP_SLOT: | |
2590 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2591 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2592 | // These are outstanding tls relocs, which are unexpected when |
2593 | // linking. | |
92e059d8 ILT |
2594 | case elfcpp::R_386_TLS_TPOFF: |
2595 | case elfcpp::R_386_TLS_DTPMOD32: | |
2596 | case elfcpp::R_386_TLS_DTPOFF32: | |
2597 | case elfcpp::R_386_TLS_TPOFF32: | |
2598 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2599 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2600 | _("unexpected reloc %u in object file"), | |
2601 | r_type); | |
92e059d8 ILT |
2602 | break; |
2603 | ||
d61c17ea ILT |
2604 | // These are initial tls relocs, which are expected when |
2605 | // linking. | |
56622147 ILT |
2606 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2607 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2608 | case elfcpp::R_386_TLS_DESC_CALL: | |
2609 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2610 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2611 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2612 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2613 | case elfcpp::R_386_TLS_GOTIE: |
2614 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2615 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2616 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2617 | view, address, view_size); | |
92e059d8 ILT |
2618 | break; |
2619 | ||
92e059d8 ILT |
2620 | case elfcpp::R_386_32PLT: |
2621 | case elfcpp::R_386_TLS_GD_32: | |
2622 | case elfcpp::R_386_TLS_GD_PUSH: | |
2623 | case elfcpp::R_386_TLS_GD_CALL: | |
2624 | case elfcpp::R_386_TLS_GD_POP: | |
2625 | case elfcpp::R_386_TLS_LDM_32: | |
2626 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2627 | case elfcpp::R_386_TLS_LDM_CALL: | |
2628 | case elfcpp::R_386_TLS_LDM_POP: | |
2629 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2630 | default: |
75f2446e ILT |
2631 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2632 | _("unsupported reloc %u"), | |
2633 | r_type); | |
92e059d8 ILT |
2634 | break; |
2635 | } | |
ead1e424 ILT |
2636 | |
2637 | return true; | |
92e059d8 ILT |
2638 | } |
2639 | ||
2640 | // Perform a TLS relocation. | |
2641 | ||
2642 | inline void | |
2643 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2644 | Target_i386* target, |
92e059d8 ILT |
2645 | size_t relnum, |
2646 | const elfcpp::Rel<32, false>& rel, | |
2647 | unsigned int r_type, | |
c06b7b0b | 2648 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2649 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2650 | unsigned char* view, |
2651 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2652 | section_size_type view_size) |
92e059d8 ILT |
2653 | { |
2654 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2655 | |
6fa2a40b | 2656 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2657 | |
2658 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2659 | |
b3705d2a ILT |
2660 | const bool is_final = (gsym == NULL |
2661 | ? !parameters->options().shared() | |
2662 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2663 | const tls::Tls_optimization optimized_type |
2664 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2665 | switch (r_type) |
2666 | { | |
56622147 | 2667 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2668 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2669 | { |
62855347 ILT |
2670 | if (tls_segment == NULL) |
2671 | { | |
191f1a2d ILT |
2672 | gold_assert(parameters->errors()->error_count() > 0 |
2673 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2674 | return; |
2675 | } | |
56622147 ILT |
2676 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2677 | rel, r_type, value, view, | |
2678 | view_size); | |
92e059d8 ILT |
2679 | break; |
2680 | } | |
07f397ab ILT |
2681 | else |
2682 | { | |
c2b45e22 CC |
2683 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2684 | ? GOT_TYPE_TLS_NOFFSET | |
2685 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2686 | unsigned int got_offset; |
2687 | if (gsym != NULL) | |
2688 | { | |
c2b45e22 CC |
2689 | gold_assert(gsym->has_got_offset(got_type)); |
2690 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2691 | } |
2692 | else | |
2693 | { | |
2694 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2695 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2696 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2697 | - target->got_size()); |
2698 | } | |
2699 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2700 | { | |
62855347 ILT |
2701 | if (tls_segment == NULL) |
2702 | { | |
191f1a2d ILT |
2703 | gold_assert(parameters->errors()->error_count() > 0 |
2704 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2705 | return; |
2706 | } | |
7bf1f802 ILT |
2707 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2708 | got_offset, view, view_size); | |
07f397ab ILT |
2709 | break; |
2710 | } | |
2711 | else if (optimized_type == tls::TLSOPT_NONE) | |
2712 | { | |
2713 | // Relocate the field with the offset of the pair of GOT | |
2714 | // entries. | |
2715 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2716 | break; | |
2717 | } | |
2718 | } | |
75f2446e ILT |
2719 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2720 | _("unsupported reloc %u"), | |
2721 | r_type); | |
92e059d8 ILT |
2722 | break; |
2723 | ||
56622147 ILT |
2724 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2725 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2726 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2727 | if (optimized_type == tls::TLSOPT_TO_LE) |
2728 | { | |
62855347 ILT |
2729 | if (tls_segment == NULL) |
2730 | { | |
191f1a2d ILT |
2731 | gold_assert(parameters->errors()->error_count() > 0 |
2732 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2733 | return; |
2734 | } | |
c2b45e22 CC |
2735 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2736 | rel, r_type, value, view, | |
2737 | view_size); | |
2738 | break; | |
2739 | } | |
2740 | else | |
2741 | { | |
2742 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2743 | ? GOT_TYPE_TLS_NOFFSET | |
2744 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2745 | unsigned int got_offset = 0; |
2746 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2747 | && optimized_type == tls::TLSOPT_NONE) | |
2748 | { | |
2749 | // We created GOT entries in the .got.tlsdesc portion of | |
2750 | // the .got.plt section, but the offset stored in the | |
2751 | // symbol is the offset within .got.tlsdesc. | |
2752 | got_offset = (target->got_size() | |
2753 | + target->got_plt_section()->data_size()); | |
2754 | } | |
c2b45e22 CC |
2755 | if (gsym != NULL) |
2756 | { | |
2757 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2758 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2759 | } |
2760 | else | |
2761 | { | |
2762 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2763 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2764 | got_offset += (object->local_got_offset(r_sym, got_type) |
2765 | - target->got_size()); | |
c2b45e22 CC |
2766 | } |
2767 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2768 | { | |
62855347 ILT |
2769 | if (tls_segment == NULL) |
2770 | { | |
191f1a2d ILT |
2771 | gold_assert(parameters->errors()->error_count() > 0 |
2772 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2773 | return; |
2774 | } | |
c2b45e22 CC |
2775 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2776 | got_offset, view, view_size); | |
2777 | break; | |
2778 | } | |
2779 | else if (optimized_type == tls::TLSOPT_NONE) | |
2780 | { | |
2781 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2782 | { | |
2783 | // Relocate the field with the offset of the pair of GOT | |
2784 | // entries. | |
2785 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2786 | } | |
2787 | break; | |
2788 | } | |
2789 | } | |
75f2446e ILT |
2790 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2791 | _("unsupported reloc %u"), | |
2792 | r_type); | |
ead1e424 ILT |
2793 | break; |
2794 | ||
56622147 | 2795 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2796 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2797 | { | |
75f2446e ILT |
2798 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2799 | _("both SUN and GNU model " | |
2800 | "TLS relocations")); | |
2801 | break; | |
46cf9fa2 ILT |
2802 | } |
2803 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2804 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2805 | { |
62855347 ILT |
2806 | if (tls_segment == NULL) |
2807 | { | |
191f1a2d ILT |
2808 | gold_assert(parameters->errors()->error_count() > 0 |
2809 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2810 | return; |
2811 | } | |
46cf9fa2 ILT |
2812 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2813 | value, view, view_size); | |
2814 | break; | |
2815 | } | |
07f397ab ILT |
2816 | else if (optimized_type == tls::TLSOPT_NONE) |
2817 | { | |
2818 | // Relocate the field with the offset of the GOT entry for | |
2819 | // the module index. | |
2820 | unsigned int got_offset; | |
94c4710f ILT |
2821 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2822 | - target->got_size()); | |
07f397ab ILT |
2823 | Relocate_functions<32, false>::rel32(view, got_offset); |
2824 | break; | |
2825 | } | |
75f2446e ILT |
2826 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2827 | _("unsupported reloc %u"), | |
2828 | r_type); | |
46cf9fa2 ILT |
2829 | break; |
2830 | ||
56622147 | 2831 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2832 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2833 | { |
82bb573a ILT |
2834 | // This reloc can appear in debugging sections, in which |
2835 | // case we must not convert to local-exec. We decide what | |
2836 | // to do based on whether the section is marked as | |
2837 | // containing executable code. That is what the GNU linker | |
2838 | // does as well. | |
2839 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2840 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 2841 | { |
62855347 ILT |
2842 | if (tls_segment == NULL) |
2843 | { | |
191f1a2d ILT |
2844 | gold_assert(parameters->errors()->error_count() > 0 |
2845 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2846 | return; |
2847 | } | |
d6f22b98 ILT |
2848 | value -= tls_segment->memsz(); |
2849 | } | |
e8a9fcda | 2850 | } |
46cf9fa2 ILT |
2851 | Relocate_functions<32, false>::rel32(view, value); |
2852 | break; | |
2853 | ||
56622147 ILT |
2854 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2855 | case elfcpp::R_386_TLS_GOTIE: | |
2856 | case elfcpp::R_386_TLS_IE_32: | |
2857 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2858 | { | |
62855347 ILT |
2859 | if (tls_segment == NULL) |
2860 | { | |
191f1a2d ILT |
2861 | gold_assert(parameters->errors()->error_count() > 0 |
2862 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2863 | return; |
2864 | } | |
56622147 ILT |
2865 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2866 | rel, r_type, value, view, | |
2867 | view_size); | |
2868 | break; | |
2869 | } | |
07f397ab ILT |
2870 | else if (optimized_type == tls::TLSOPT_NONE) |
2871 | { | |
2872 | // Relocate the field with the offset of the GOT entry for | |
2873 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2874 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2875 | ? GOT_TYPE_TLS_OFFSET | |
2876 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2877 | unsigned int got_offset; |
2878 | if (gsym != NULL) | |
2879 | { | |
c2b45e22 CC |
2880 | gold_assert(gsym->has_got_offset(got_type)); |
2881 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2882 | } |
2883 | else | |
2884 | { | |
2885 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2886 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2887 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2888 | } |
2889 | // For the R_386_TLS_IE relocation, we need to apply the | |
2890 | // absolute address of the GOT entry. | |
2891 | if (r_type == elfcpp::R_386_TLS_IE) | |
2892 | got_offset += target->got_plt_section()->address(); | |
2893 | // All GOT offsets are relative to the end of the GOT. | |
2894 | got_offset -= target->got_size(); | |
2895 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2896 | break; | |
2897 | } | |
75f2446e ILT |
2898 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2899 | _("unsupported reloc %u"), | |
2900 | r_type); | |
92e059d8 | 2901 | break; |
92e059d8 | 2902 | |
56622147 | 2903 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2904 | // If we're creating a shared library, a dynamic relocation will |
2905 | // have been created for this location, so do not apply it now. | |
8851ecca | 2906 | if (!parameters->options().shared()) |
7bf1f802 | 2907 | { |
62855347 ILT |
2908 | if (tls_segment == NULL) |
2909 | { | |
191f1a2d ILT |
2910 | gold_assert(parameters->errors()->error_count() > 0 |
2911 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2912 | return; |
2913 | } | |
7bf1f802 ILT |
2914 | value -= tls_segment->memsz(); |
2915 | Relocate_functions<32, false>::rel32(view, value); | |
2916 | } | |
56622147 | 2917 | break; |
92e059d8 | 2918 | |
56622147 | 2919 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2920 | // If we're creating a shared library, a dynamic relocation will |
2921 | // have been created for this location, so do not apply it now. | |
8851ecca | 2922 | if (!parameters->options().shared()) |
7bf1f802 | 2923 | { |
62855347 ILT |
2924 | if (tls_segment == NULL) |
2925 | { | |
191f1a2d ILT |
2926 | gold_assert(parameters->errors()->error_count() > 0 |
2927 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2928 | return; |
2929 | } | |
7bf1f802 ILT |
2930 | value = tls_segment->memsz() - value; |
2931 | Relocate_functions<32, false>::rel32(view, value); | |
2932 | } | |
56622147 | 2933 | break; |
92e059d8 | 2934 | } |
92e059d8 ILT |
2935 | } |
2936 | ||
e041f13d | 2937 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2938 | // Local-Exec. |
2939 | ||
2940 | inline void | |
2941 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2942 | size_t relnum, | |
2943 | Output_segment* tls_segment, | |
2944 | const elfcpp::Rel<32, false>& rel, | |
2945 | unsigned int, | |
2946 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2947 | unsigned char* view, | |
fe8718a4 | 2948 | section_size_type view_size) |
ead1e424 ILT |
2949 | { |
2950 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2951 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2952 | // leal foo(%reg),%eax; call ___tls_get_addr |
2953 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2954 | ||
af6359d5 ILT |
2955 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2956 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2957 | |
2958 | unsigned char op1 = view[-1]; | |
2959 | unsigned char op2 = view[-2]; | |
2960 | ||
af6359d5 ILT |
2961 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2962 | op2 == 0x8d || op2 == 0x04); | |
2963 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2964 | |
2965 | int roff = 5; | |
2966 | ||
2967 | if (op2 == 0x04) | |
2968 | { | |
af6359d5 ILT |
2969 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2970 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2971 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2972 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2973 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2974 | } | |
2975 | else | |
2976 | { | |
af6359d5 ILT |
2977 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2978 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2979 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2980 | && view[9] == 0x90) |
ead1e424 ILT |
2981 | { |
2982 | // There is a trailing nop. Use the size byte subl. | |
2983 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2984 | roff = 6; | |
2985 | } | |
2986 | else | |
2987 | { | |
2988 | // Use the five byte subl. | |
2989 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2990 | } | |
2991 | } | |
2992 | ||
7bf1f802 | 2993 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2994 | Relocate_functions<32, false>::rel32(view + roff, value); |
2995 | ||
2996 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2997 | // We can skip it. | |
2998 | this->skip_call_tls_get_addr_ = true; | |
2999 | } | |
3000 | ||
7bf1f802 | 3001 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3002 | // Initial-Exec. |
3003 | ||
3004 | inline void | |
3005 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3006 | size_t relnum, | |
c2b45e22 | 3007 | Output_segment*, |
07f397ab ILT |
3008 | const elfcpp::Rel<32, false>& rel, |
3009 | unsigned int, | |
3010 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3011 | unsigned char* view, | |
fe8718a4 | 3012 | section_size_type view_size) |
07f397ab ILT |
3013 | { |
3014 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3015 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
3016 | ||
3017 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3018 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3019 | ||
3020 | unsigned char op1 = view[-1]; | |
3021 | unsigned char op2 = view[-2]; | |
3022 | ||
3023 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3024 | op2 == 0x8d || op2 == 0x04); | |
3025 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
3026 | ||
3027 | int roff = 5; | |
3028 | ||
c2b45e22 CC |
3029 | // FIXME: For now, support only the first (SIB) form. |
3030 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
3031 | |
3032 | if (op2 == 0x04) | |
3033 | { | |
3034 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3035 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3036 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3037 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
3038 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
3039 | } | |
3040 | else | |
3041 | { | |
3042 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3043 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 3044 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
3045 | && view[9] == 0x90) |
3046 | { | |
3047 | // FIXME: This is not the right instruction sequence. | |
3048 | // There is a trailing nop. Use the size byte subl. | |
3049 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3050 | roff = 6; | |
3051 | } | |
3052 | else | |
3053 | { | |
3054 | // FIXME: This is not the right instruction sequence. | |
3055 | // Use the five byte subl. | |
3056 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3057 | } | |
3058 | } | |
3059 | ||
07f397ab ILT |
3060 | Relocate_functions<32, false>::rel32(view + roff, value); |
3061 | ||
3062 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3063 | // We can skip it. | |
3064 | this->skip_call_tls_get_addr_ = true; | |
3065 | } | |
3066 | ||
c2b45e22 CC |
3067 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3068 | // General-Dynamic to a Local-Exec. | |
3069 | ||
3070 | inline void | |
3071 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3072 | const Relocate_info<32, false>* relinfo, | |
3073 | size_t relnum, | |
3074 | Output_segment* tls_segment, | |
3075 | const elfcpp::Rel<32, false>& rel, | |
3076 | unsigned int r_type, | |
3077 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3078 | unsigned char* view, | |
3079 | section_size_type view_size) | |
3080 | { | |
3081 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3082 | { | |
3083 | // leal foo@TLSDESC(%ebx), %eax | |
3084 | // ==> leal foo@NTPOFF, %eax | |
3085 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3086 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3087 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3088 | view[-2] == 0x8d && view[-1] == 0x83); | |
3089 | view[-1] = 0x05; | |
3090 | value -= tls_segment->memsz(); | |
3091 | Relocate_functions<32, false>::rel32(view, value); | |
3092 | } | |
3093 | else | |
3094 | { | |
3095 | // call *foo@TLSCALL(%eax) | |
3096 | // ==> nop; nop | |
3097 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3098 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3099 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3100 | view[0] == 0xff && view[1] == 0x10); | |
3101 | view[0] = 0x66; | |
3102 | view[1] = 0x90; | |
3103 | } | |
3104 | } | |
3105 | ||
3106 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3107 | // General-Dynamic to an Initial-Exec. | |
3108 | ||
3109 | inline void | |
3110 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3111 | const Relocate_info<32, false>* relinfo, | |
3112 | size_t relnum, | |
3113 | Output_segment*, | |
3114 | const elfcpp::Rel<32, false>& rel, | |
3115 | unsigned int r_type, | |
3116 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3117 | unsigned char* view, | |
3118 | section_size_type view_size) | |
3119 | { | |
3120 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3121 | { | |
3122 | // leal foo@TLSDESC(%ebx), %eax | |
3123 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3124 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3125 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3126 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3127 | view[-2] == 0x8d && view[-1] == 0x83); | |
3128 | view[-2] = 0x8b; | |
3129 | Relocate_functions<32, false>::rel32(view, value); | |
3130 | } | |
3131 | else | |
3132 | { | |
3133 | // call *foo@TLSCALL(%eax) | |
3134 | // ==> nop; nop | |
3135 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3136 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3137 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3138 | view[0] == 0xff && view[1] == 0x10); | |
3139 | view[0] = 0x66; | |
3140 | view[1] = 0x90; | |
3141 | } | |
3142 | } | |
3143 | ||
46cf9fa2 ILT |
3144 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3145 | // Local-Exec. | |
3146 | ||
3147 | inline void | |
3148 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3149 | size_t relnum, | |
3150 | Output_segment*, | |
3151 | const elfcpp::Rel<32, false>& rel, | |
3152 | unsigned int, | |
3153 | elfcpp::Elf_types<32>::Elf_Addr, | |
3154 | unsigned char* view, | |
fe8718a4 | 3155 | section_size_type view_size) |
46cf9fa2 ILT |
3156 | { |
3157 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3158 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3159 | ||
af6359d5 ILT |
3160 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3161 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3162 | |
3163 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
3164 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
3165 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 3166 | |
af6359d5 | 3167 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3168 | |
3169 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3170 | ||
3171 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3172 | // We can skip it. | |
3173 | this->skip_call_tls_get_addr_ = true; | |
3174 | } | |
3175 | ||
56622147 ILT |
3176 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3177 | // Local-Exec. | |
3178 | ||
3179 | inline void | |
3180 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3181 | size_t relnum, | |
3182 | Output_segment* tls_segment, | |
3183 | const elfcpp::Rel<32, false>& rel, | |
3184 | unsigned int r_type, | |
3185 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3186 | unsigned char* view, | |
fe8718a4 | 3187 | section_size_type view_size) |
56622147 ILT |
3188 | { |
3189 | // We have to actually change the instructions, which means that we | |
3190 | // need to examine the opcodes to figure out which instruction we | |
3191 | // are looking at. | |
3192 | if (r_type == elfcpp::R_386_TLS_IE) | |
3193 | { | |
3194 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3195 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3196 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3197 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3198 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3199 | ||
3200 | unsigned char op1 = view[-1]; | |
3201 | if (op1 == 0xa1) | |
3202 | { | |
3203 | // movl XX,%eax ==> movl $YY,%eax | |
3204 | view[-1] = 0xb8; | |
3205 | } | |
3206 | else | |
3207 | { | |
3208 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3209 | ||
3210 | unsigned char op2 = view[-2]; | |
3211 | if (op2 == 0x8b) | |
3212 | { | |
3213 | // movl XX,%reg ==> movl $YY,%reg | |
3214 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3215 | (op1 & 0xc7) == 0x05); | |
3216 | view[-2] = 0xc7; | |
3217 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3218 | } | |
3219 | else if (op2 == 0x03) | |
3220 | { | |
3221 | // addl XX,%reg ==> addl $YY,%reg | |
3222 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3223 | (op1 & 0xc7) == 0x05); | |
3224 | view[-2] = 0x81; | |
3225 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3226 | } | |
3227 | else | |
3228 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3229 | } | |
3230 | } | |
3231 | else | |
3232 | { | |
3233 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3234 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3235 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3236 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3237 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3238 | ||
3239 | unsigned char op1 = view[-1]; | |
3240 | unsigned char op2 = view[-2]; | |
3241 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3242 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
3243 | if (op2 == 0x8b) | |
3244 | { | |
3245 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3246 | view[-2] = 0xc7; | |
3247 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3248 | } | |
3249 | else if (op2 == 0x2b) | |
3250 | { | |
3251 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3252 | view[-2] = 0x81; | |
3253 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3254 | } | |
3255 | else if (op2 == 0x03) | |
3256 | { | |
3257 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3258 | view[-2] = 0x81; | |
3259 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3260 | } | |
3261 | else | |
3262 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3263 | } | |
3264 | ||
7bf1f802 | 3265 | value = tls_segment->memsz() - value; |
56622147 ILT |
3266 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3267 | value = - value; | |
3268 | ||
3269 | Relocate_functions<32, false>::rel32(view, value); | |
3270 | } | |
3271 | ||
61ba1cf9 ILT |
3272 | // Relocate section data. |
3273 | ||
3274 | void | |
92e059d8 | 3275 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3276 | unsigned int sh_type, |
3277 | const unsigned char* prelocs, | |
3278 | size_t reloc_count, | |
730cdc88 ILT |
3279 | Output_section* output_section, |
3280 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3281 | unsigned char* view, |
3282 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3283 | section_size_type view_size, |
3284 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3285 | { |
a3ad94ed | 3286 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3287 | |
ead1e424 ILT |
3288 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
3289 | Target_i386::Relocate>( | |
92e059d8 | 3290 | relinfo, |
ead1e424 | 3291 | this, |
61ba1cf9 ILT |
3292 | prelocs, |
3293 | reloc_count, | |
730cdc88 ILT |
3294 | output_section, |
3295 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3296 | view, |
3297 | address, | |
364c7fa5 ILT |
3298 | view_size, |
3299 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3300 | } |
3301 | ||
6a74a719 ILT |
3302 | // Return the size of a relocation while scanning during a relocatable |
3303 | // link. | |
3304 | ||
3305 | unsigned int | |
3306 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3307 | unsigned int r_type, | |
3308 | Relobj* object) | |
3309 | { | |
3310 | switch (r_type) | |
3311 | { | |
3312 | case elfcpp::R_386_NONE: | |
3313 | case elfcpp::R_386_GNU_VTINHERIT: | |
3314 | case elfcpp::R_386_GNU_VTENTRY: | |
3315 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3316 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3317 | case elfcpp::R_386_TLS_DESC_CALL: | |
3318 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3319 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3320 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3321 | case elfcpp::R_386_TLS_IE_32: | |
3322 | case elfcpp::R_386_TLS_GOTIE: | |
3323 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3324 | case elfcpp::R_386_TLS_LE_32: | |
3325 | return 0; | |
3326 | ||
3327 | case elfcpp::R_386_32: | |
3328 | case elfcpp::R_386_PC32: | |
3329 | case elfcpp::R_386_GOT32: | |
3330 | case elfcpp::R_386_PLT32: | |
3331 | case elfcpp::R_386_GOTOFF: | |
3332 | case elfcpp::R_386_GOTPC: | |
3333 | return 4; | |
3334 | ||
3335 | case elfcpp::R_386_16: | |
3336 | case elfcpp::R_386_PC16: | |
3337 | return 2; | |
3338 | ||
3339 | case elfcpp::R_386_8: | |
3340 | case elfcpp::R_386_PC8: | |
3341 | return 1; | |
3342 | ||
3343 | // These are relocations which should only be seen by the | |
3344 | // dynamic linker, and should never be seen here. | |
3345 | case elfcpp::R_386_COPY: | |
3346 | case elfcpp::R_386_GLOB_DAT: | |
3347 | case elfcpp::R_386_JUMP_SLOT: | |
3348 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3349 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3350 | case elfcpp::R_386_TLS_TPOFF: |
3351 | case elfcpp::R_386_TLS_DTPMOD32: | |
3352 | case elfcpp::R_386_TLS_DTPOFF32: | |
3353 | case elfcpp::R_386_TLS_TPOFF32: | |
3354 | case elfcpp::R_386_TLS_DESC: | |
3355 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3356 | return 0; | |
3357 | ||
3358 | case elfcpp::R_386_32PLT: | |
3359 | case elfcpp::R_386_TLS_GD_32: | |
3360 | case elfcpp::R_386_TLS_GD_PUSH: | |
3361 | case elfcpp::R_386_TLS_GD_CALL: | |
3362 | case elfcpp::R_386_TLS_GD_POP: | |
3363 | case elfcpp::R_386_TLS_LDM_32: | |
3364 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3365 | case elfcpp::R_386_TLS_LDM_CALL: | |
3366 | case elfcpp::R_386_TLS_LDM_POP: | |
3367 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3368 | default: | |
3369 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3370 | return 0; | |
3371 | } | |
3372 | } | |
3373 | ||
3374 | // Scan the relocs during a relocatable link. | |
3375 | ||
3376 | void | |
ad0f2072 | 3377 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3378 | Layout* layout, |
6fa2a40b | 3379 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3380 | unsigned int data_shndx, |
3381 | unsigned int sh_type, | |
3382 | const unsigned char* prelocs, | |
3383 | size_t reloc_count, | |
3384 | Output_section* output_section, | |
3385 | bool needs_special_offset_handling, | |
3386 | size_t local_symbol_count, | |
3387 | const unsigned char* plocal_symbols, | |
3388 | Relocatable_relocs* rr) | |
3389 | { | |
3390 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3391 | ||
3392 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3393 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3394 | ||
7019cd25 | 3395 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3396 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3397 | symtab, |
3398 | layout, | |
3399 | object, | |
3400 | data_shndx, | |
3401 | prelocs, | |
3402 | reloc_count, | |
3403 | output_section, | |
3404 | needs_special_offset_handling, | |
3405 | local_symbol_count, | |
3406 | plocal_symbols, | |
3407 | rr); | |
3408 | } | |
3409 | ||
3410 | // Relocate a section during a relocatable link. | |
3411 | ||
3412 | void | |
3413 | Target_i386::relocate_for_relocatable( | |
3414 | const Relocate_info<32, false>* relinfo, | |
3415 | unsigned int sh_type, | |
3416 | const unsigned char* prelocs, | |
3417 | size_t reloc_count, | |
3418 | Output_section* output_section, | |
3419 | off_t offset_in_output_section, | |
3420 | const Relocatable_relocs* rr, | |
3421 | unsigned char* view, | |
3422 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3423 | section_size_type view_size, | |
3424 | unsigned char* reloc_view, | |
3425 | section_size_type reloc_view_size) | |
3426 | { | |
3427 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3428 | ||
7019cd25 | 3429 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3430 | relinfo, |
3431 | prelocs, | |
3432 | reloc_count, | |
3433 | output_section, | |
3434 | offset_in_output_section, | |
3435 | rr, | |
3436 | view, | |
3437 | view_address, | |
3438 | view_size, | |
3439 | reloc_view, | |
3440 | reloc_view_size); | |
3441 | } | |
3442 | ||
ab5c9e90 ILT |
3443 | // Return the value to use for a dynamic which requires special |
3444 | // treatment. This is how we support equality comparisons of function | |
3445 | // pointers across shared library boundaries, as described in the | |
3446 | // processor specific ABI supplement. | |
3447 | ||
3448 | uint64_t | |
3449 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3450 | { | |
3451 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 3452 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
ab5c9e90 ILT |
3453 | } |
3454 | ||
c51e6221 ILT |
3455 | // Return a string used to fill a code section with nops to take up |
3456 | // the specified length. | |
3457 | ||
3458 | std::string | |
8851ecca | 3459 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3460 | { |
3461 | if (length >= 16) | |
3462 | { | |
3463 | // Build a jmp instruction to skip over the bytes. | |
3464 | unsigned char jmp[5]; | |
3465 | jmp[0] = 0xe9; | |
3466 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3467 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3468 | + std::string(length - 5, '\0')); | |
3469 | } | |
3470 | ||
3471 | // Nop sequences of various lengths. | |
3472 | const char nop1[1] = { 0x90 }; // nop | |
3473 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3474 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3475 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3476 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3477 | 0x00 }; // leal 0(%esi,1),%esi | |
3478 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3479 | 0x00, 0x00 }; | |
3480 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3481 | 0x00, 0x00, 0x00 }; | |
3482 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3483 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3484 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3485 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3486 | 0x00 }; | |
3487 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3488 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3489 | 0x00, 0x00 }; | |
3490 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3491 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3492 | 0x00, 0x00, 0x00 }; | |
3493 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3494 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3495 | 0x00, 0x00, 0x00, 0x00 }; | |
3496 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3497 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3498 | 0x27, 0x00, 0x00, 0x00, | |
3499 | 0x00 }; | |
3500 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3501 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3502 | 0xbc, 0x27, 0x00, 0x00, | |
3503 | 0x00, 0x00 }; | |
3504 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3505 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3506 | 0x90, 0x90, 0x90, 0x90, | |
3507 | 0x90, 0x90, 0x90 }; | |
3508 | ||
3509 | const char* nops[16] = { | |
3510 | NULL, | |
3511 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3512 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3513 | }; | |
3514 | ||
3515 | return std::string(nops[length], length); | |
3516 | } | |
3517 | ||
02d7cd44 ILT |
3518 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3519 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3520 | // assembler can not write out the difference between two labels in | |
3521 | // different sections, so instead of using a pc-relative value they | |
3522 | // use an offset from the GOT. | |
3523 | ||
3524 | uint64_t | |
3525 | Target_i386::do_ehframe_datarel_base() const | |
3526 | { | |
3527 | gold_assert(this->global_offset_table_ != NULL); | |
3528 | Symbol* sym = this->global_offset_table_; | |
3529 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3530 | return ssym->value(); | |
3531 | } | |
3532 | ||
b6848d3c ILT |
3533 | // Return whether SYM should be treated as a call to a non-split |
3534 | // function. We don't want that to be true of a call to a | |
3535 | // get_pc_thunk function. | |
3536 | ||
3537 | bool | |
3538 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3539 | { | |
3540 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3541 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3542 | } | |
3543 | ||
364c7fa5 | 3544 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3545 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3546 | // code. We have to change the function so that it always ensures |
3547 | // that it has enough stack space to run some random function. | |
3548 | ||
3549 | void | |
3550 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3551 | section_offset_type fnoffset, | |
3552 | section_size_type fnsize, | |
3553 | unsigned char* view, | |
3554 | section_size_type view_size, | |
3555 | std::string* from, | |
3556 | std::string* to) const | |
3557 | { | |
3558 | // The function starts with a comparison of the stack pointer and a | |
3559 | // field in the TCB. This is followed by a jump. | |
3560 | ||
3561 | // cmp %gs:NN,%esp | |
3562 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3563 | && fnsize > 7) | |
3564 | { | |
3565 | // We will call __morestack if the carry flag is set after this | |
3566 | // comparison. We turn the comparison into an stc instruction | |
3567 | // and some nops. | |
3568 | view[fnoffset] = '\xf9'; | |
3569 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3570 | } | |
3571 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3572 | // lea NN(%esp),%edx |
3573 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3574 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3575 | && fnsize > 7) |
3576 | { | |
3577 | // This is loading an offset from the stack pointer for a | |
3578 | // comparison. The offset is negative, so we decrease the | |
3579 | // offset by the amount of space we need for the stack. This | |
3580 | // means we will avoid calling __morestack if there happens to | |
3581 | // be plenty of space on the stack already. | |
3582 | unsigned char* pval = view + fnoffset + 3; | |
3583 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3584 | val -= parameters->options().split_stack_adjust_size(); | |
3585 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3586 | } | |
3587 | else | |
3588 | { | |
3589 | if (!object->has_no_split_stack()) | |
3590 | object->error(_("failed to match split-stack sequence at " | |
3591 | "section %u offset %0zx"), | |
ac33a407 | 3592 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3593 | return; |
3594 | } | |
3595 | ||
3596 | // We have to change the function so that it calls | |
3597 | // __morestack_non_split instead of __morestack. The former will | |
3598 | // allocate additional stack space. | |
3599 | *from = "__morestack"; | |
3600 | *to = "__morestack_non_split"; | |
3601 | } | |
3602 | ||
14bfc3f5 ILT |
3603 | // The selector for i386 object files. |
3604 | ||
36959681 | 3605 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3606 | { |
3607 | public: | |
3608 | Target_selector_i386() | |
36959681 | 3609 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3610 | "elf32-i386", "elf32-i386-freebsd", |
3611 | "elf_i386") | |
14bfc3f5 ILT |
3612 | { } |
3613 | ||
3614 | Target* | |
e96caa79 ILT |
3615 | do_instantiate_target() |
3616 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3617 | }; |
3618 | ||
14bfc3f5 ILT |
3619 | Target_selector_i386 target_selector_i386; |
3620 | ||
3621 | } // End anonymous namespace. |