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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 | |
82742395 ILT |
715 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
716 | (elfcpp::SHF_ALLOC | |
717 | | elfcpp::SHF_WRITE), | |
22f0da72 | 718 | this->got_, ORDER_RELRO_LAST, true); |
ead1e424 | 719 | |
7d9e3d98 | 720 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
721 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
722 | (elfcpp::SHF_ALLOC | |
723 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
724 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
725 | false); | |
a3ad94ed | 726 | |
ead1e424 | 727 | // The first three entries are reserved. |
27bc2bce | 728 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 729 | |
1a2dff53 ILT |
730 | // Those bytes can go into the relro segment. |
731 | layout->increase_relro(3 * 4); | |
732 | ||
a3ad94ed | 733 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
734 | this->global_offset_table_ = |
735 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
736 | Symbol_table::PREDEFINED, | |
737 | this->got_plt_, | |
738 | 0, 0, elfcpp::STT_OBJECT, | |
739 | elfcpp::STB_LOCAL, | |
740 | elfcpp::STV_HIDDEN, 0, | |
741 | false, false); | |
a8df5856 | 742 | |
67181c72 ILT |
743 | // If there are any IRELATIVE relocations, they get GOT entries |
744 | // in .got.plt after the jump slot relocations. | |
745 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
746 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
747 | (elfcpp::SHF_ALLOC | |
748 | | elfcpp::SHF_WRITE), | |
749 | this->got_irelative_, | |
750 | ORDER_NON_RELRO_FIRST, false); | |
751 | ||
a8df5856 ILT |
752 | // If there are any TLSDESC relocations, they get GOT entries in |
753 | // .got.plt after the jump slot entries. | |
754 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
755 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
756 | (elfcpp::SHF_ALLOC | |
757 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
758 | this->got_tlsdesc_, |
759 | ORDER_NON_RELRO_FIRST, false); | |
ead1e424 | 760 | } |
a3ad94ed | 761 | |
ead1e424 ILT |
762 | return this->got_; |
763 | } | |
764 | ||
5a6f7e2d ILT |
765 | // Get the dynamic reloc section, creating it if necessary. |
766 | ||
767 | Target_i386::Reloc_section* | |
768 | Target_i386::rel_dyn_section(Layout* layout) | |
769 | { | |
770 | if (this->rel_dyn_ == NULL) | |
771 | { | |
772 | gold_assert(layout != NULL); | |
d98bc257 | 773 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 774 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
775 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
776 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
777 | } |
778 | return this->rel_dyn_; | |
779 | } | |
780 | ||
67181c72 ILT |
781 | // Get the section to use for IRELATIVE relocs, creating it if |
782 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
783 | // relocations. They need to follow the other dynamic relocations so | |
784 | // that they can refer to global variables initialized by those | |
785 | // relocs. | |
786 | ||
787 | Target_i386::Reloc_section* | |
788 | Target_i386::rel_irelative_section(Layout* layout) | |
789 | { | |
790 | if (this->rel_irelative_ == NULL) | |
791 | { | |
792 | // Make sure we have already create the dynamic reloc section. | |
793 | this->rel_dyn_section(layout); | |
794 | this->rel_irelative_ = new Reloc_section(false); | |
795 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
796 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
797 | ORDER_DYNAMIC_RELOCS, false); | |
798 | gold_assert(this->rel_dyn_->output_section() | |
799 | == this->rel_irelative_->output_section()); | |
800 | } | |
801 | return this->rel_irelative_; | |
802 | } | |
803 | ||
a3ad94ed ILT |
804 | // Create the PLT section. The ordinary .got section is an argument, |
805 | // since we need to refer to the start. We also create our own .got | |
806 | // section just for PLT entries. | |
807 | ||
67181c72 ILT |
808 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
809 | Output_data_space* got_plt, | |
810 | Output_data_space* got_irelative) | |
811 | : Output_section_data(16), tls_desc_rel_(NULL), irelative_rel_(NULL), | |
812 | got_plt_(got_plt), got_irelative_(got_irelative), count_(0), | |
813 | irelative_count_(0), global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 814 | { |
d98bc257 | 815 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 816 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
817 | elfcpp::SHF_ALLOC, this->rel_, |
818 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca | 819 | |
07a60597 ILT |
820 | // Add unwind information if requested. |
821 | if (parameters->options().ld_generated_unwind_info()) | |
822 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
823 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
a3ad94ed ILT |
824 | } |
825 | ||
16649710 ILT |
826 | void |
827 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
828 | { | |
829 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
830 | // linker, and so do we. | |
831 | os->set_entsize(4); | |
832 | } | |
833 | ||
a3ad94ed ILT |
834 | // Add an entry to the PLT. |
835 | ||
836 | void | |
67181c72 ILT |
837 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
838 | Symbol* gsym) | |
a3ad94ed ILT |
839 | { |
840 | gold_assert(!gsym->has_plt_offset()); | |
841 | ||
a3ad94ed | 842 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
843 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
844 | && gsym->can_use_relative_reloc(false)) | |
845 | { | |
67181c72 ILT |
846 | gsym->set_plt_offset(this->irelative_count_ * plt_entry_size); |
847 | ++this->irelative_count_; | |
848 | section_offset_type got_offset = | |
849 | this->got_irelative_->current_data_size(); | |
850 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
851 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
852 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
853 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
854 | struct Global_ifunc gi; |
855 | gi.sym = gsym; | |
856 | gi.got_offset = got_offset; | |
857 | this->global_ifuncs_.push_back(gi); | |
858 | } | |
859 | else | |
860 | { | |
67181c72 ILT |
861 | // When setting the PLT offset we skip the initial reserved PLT |
862 | // entry. | |
863 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
864 | ||
865 | ++this->count_; | |
866 | ||
867 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
868 | ||
869 | // Every PLT entry needs a GOT entry which points back to the | |
870 | // PLT entry (this will be changed by the dynamic linker, | |
871 | // normally lazily when the function is called). | |
872 | this->got_plt_->set_current_data_size(got_offset + 4); | |
873 | ||
7223e9ca ILT |
874 | gsym->set_needs_dynsym_entry(); |
875 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
876 | got_offset); | |
877 | } | |
a3ad94ed ILT |
878 | |
879 | // Note that we don't need to save the symbol. The contents of the | |
880 | // PLT are independent of which symbols are used. The symbols only | |
881 | // appear in the relocations. | |
882 | } | |
883 | ||
7223e9ca ILT |
884 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
885 | // the PLT offset. | |
886 | ||
887 | unsigned int | |
6fa2a40b | 888 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
889 | Symbol_table* symtab, |
890 | Layout* layout, | |
6fa2a40b CC |
891 | Sized_relobj_file<32, false>* relobj, |
892 | unsigned int local_sym_index) | |
7223e9ca | 893 | { |
67181c72 ILT |
894 | unsigned int plt_offset = this->irelative_count_ * plt_entry_size; |
895 | ++this->irelative_count_; | |
7223e9ca | 896 | |
67181c72 | 897 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
898 | |
899 | // Every PLT entry needs a GOT entry which points back to the PLT | |
900 | // entry. | |
67181c72 | 901 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
902 | |
903 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
904 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
905 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
906 | elfcpp::R_386_IRELATIVE, | |
907 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
908 | |
909 | struct Local_ifunc li; | |
910 | li.object = relobj; | |
911 | li.local_sym_index = local_sym_index; | |
912 | li.got_offset = got_offset; | |
913 | this->local_ifuncs_.push_back(li); | |
914 | ||
915 | return plt_offset; | |
916 | } | |
917 | ||
e291e7b9 ILT |
918 | // Return where the TLS_DESC relocations should go, creating it if |
919 | // necessary. These follow the JUMP_SLOT relocations. | |
920 | ||
921 | Output_data_plt_i386::Reloc_section* | |
922 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
923 | { | |
924 | if (this->tls_desc_rel_ == NULL) | |
925 | { | |
926 | this->tls_desc_rel_ = new Reloc_section(false); | |
927 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
928 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 929 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
930 | gold_assert(this->tls_desc_rel_->output_section() |
931 | == this->rel_->output_section()); | |
e291e7b9 ILT |
932 | } |
933 | return this->tls_desc_rel_; | |
934 | } | |
935 | ||
67181c72 ILT |
936 | // Return where the IRELATIVE relocations should go in the PLT. These |
937 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
938 | ||
939 | Output_data_plt_i386::Reloc_section* | |
940 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
941 | { | |
942 | if (this->irelative_rel_ == NULL) | |
943 | { | |
944 | // Make sure we have a place for the TLS_DESC relocations, in | |
945 | // case we see any later on. | |
946 | this->rel_tls_desc(layout); | |
947 | this->irelative_rel_ = new Reloc_section(false); | |
948 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
949 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
950 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
951 | gold_assert(this->irelative_rel_->output_section() | |
952 | == this->rel_->output_section()); | |
953 | ||
954 | if (parameters->doing_static_link()) | |
955 | { | |
956 | // A statically linked executable will only have a .rel.plt | |
957 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
958 | // symbols. The library will use these symbols to locate | |
959 | // the IRELATIVE relocs at program startup time. | |
960 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
961 | Symbol_table::PREDEFINED, | |
962 | this->irelative_rel_, 0, 0, | |
963 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
964 | elfcpp::STV_HIDDEN, 0, false, true); | |
965 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
966 | Symbol_table::PREDEFINED, | |
967 | this->irelative_rel_, 0, 0, | |
968 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
969 | elfcpp::STV_HIDDEN, 0, true, true); | |
970 | } | |
971 | } | |
972 | return this->irelative_rel_; | |
973 | } | |
974 | ||
975 | // Return the PLT address to use for a global symbol. | |
976 | ||
977 | uint64_t | |
978 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
979 | { | |
980 | uint64_t offset = 0; | |
981 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
982 | && gsym->can_use_relative_reloc(false)) | |
983 | offset = (this->count_ + 1) * plt_entry_size; | |
984 | return this->address() + offset; | |
985 | } | |
986 | ||
987 | // Return the PLT address to use for a local symbol. These are always | |
988 | // IRELATIVE relocs. | |
989 | ||
990 | uint64_t | |
991 | Output_data_plt_i386::address_for_local(const Relobj*, unsigned int) | |
992 | { | |
993 | return this->address() + (this->count_ + 1) * plt_entry_size; | |
994 | } | |
995 | ||
a3ad94ed ILT |
996 | // The first entry in the PLT for an executable. |
997 | ||
07a60597 | 998 | const unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
999 | { |
1000 | 0xff, 0x35, // pushl contents of memory address | |
1001 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1002 | 0xff, 0x25, // jmp indirect | |
1003 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1004 | 0, 0, 0, 0 // unused | |
1005 | }; | |
1006 | ||
1007 | // The first entry in the PLT for a shared object. | |
1008 | ||
07a60597 | 1009 | const unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1010 | { |
1011 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1012 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1013 | 0, 0, 0, 0 // unused | |
1014 | }; | |
1015 | ||
1016 | // Subsequent entries in the PLT for an executable. | |
1017 | ||
07a60597 | 1018 | const unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1019 | { |
1020 | 0xff, 0x25, // jmp indirect | |
1021 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1022 | 0x68, // pushl immediate | |
1023 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1024 | 0xe9, // jmp relative | |
1025 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1026 | }; | |
1027 | ||
1028 | // Subsequent entries in the PLT for a shared object. | |
1029 | ||
07a60597 | 1030 | const unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1031 | { |
1032 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1033 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1034 | 0x68, // pushl immediate | |
1035 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1036 | 0xe9, // jmp relative | |
1037 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1038 | }; | |
1039 | ||
07a60597 ILT |
1040 | // The .eh_frame unwind information for the PLT. |
1041 | ||
1042 | const unsigned char | |
1043 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1044 | { | |
1045 | 1, // CIE version. | |
1046 | 'z', // Augmentation: augmentation size included. | |
1047 | 'R', // Augmentation: FDE encoding included. | |
1048 | '\0', // End of augmentation string. | |
1049 | 1, // Code alignment factor. | |
1050 | 0x7c, // Data alignment factor. | |
1051 | 8, // Return address column. | |
1052 | 1, // Augmentation size. | |
1053 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1054 | | elfcpp::DW_EH_PE_sdata4), | |
1055 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1056 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1057 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1058 | elfcpp::DW_CFA_nop | |
1059 | }; | |
1060 | ||
1061 | const unsigned char | |
1062 | Output_data_plt_i386::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
1063 | { | |
1064 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1065 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1066 | 0, // Augmentation size. | |
1067 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1068 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1069 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1070 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1071 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1072 | 11, // Block length. | |
1073 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1074 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1075 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1076 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1077 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1078 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1079 | elfcpp::DW_OP_lit2, // Push 2. | |
1080 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1081 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1082 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1083 | elfcpp::DW_CFA_nop, | |
1084 | elfcpp::DW_CFA_nop, | |
1085 | elfcpp::DW_CFA_nop | |
1086 | }; | |
1087 | ||
a3ad94ed ILT |
1088 | // Write out the PLT. This uses the hand-coded instructions above, |
1089 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1090 | // Processor Supplement. | |
1091 | ||
1092 | void | |
1093 | Output_data_plt_i386::do_write(Output_file* of) | |
1094 | { | |
2ea97941 | 1095 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1096 | const section_size_type oview_size = |
1097 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1098 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1099 | |
1100 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1101 | gold_assert(parameters->incremental_update() |
1102 | || (got_file_offset + this->got_plt_->data_size() | |
1103 | == this->got_irelative_->offset())); | |
fe8718a4 | 1104 | const section_size_type got_size = |
67181c72 ILT |
1105 | convert_to_section_size_type(this->got_plt_->data_size() |
1106 | + this->got_irelative_->data_size()); | |
a3ad94ed ILT |
1107 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1108 | got_size); | |
1109 | ||
1110 | unsigned char* pov = oview; | |
1111 | ||
1112 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1113 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1114 | ||
374ad285 | 1115 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1116 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
1117 | else | |
1118 | { | |
1119 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
1120 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1121 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1122 | } | |
1123 | pov += plt_entry_size; | |
1124 | ||
1125 | unsigned char* got_pov = got_view; | |
1126 | ||
1127 | memset(got_pov, 0, 12); | |
1128 | got_pov += 12; | |
1129 | ||
1130 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1131 | ||
1132 | unsigned int plt_offset = plt_entry_size; | |
1133 | unsigned int plt_rel_offset = 0; | |
1134 | unsigned int got_offset = 12; | |
67181c72 | 1135 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1136 | for (unsigned int i = 0; |
1137 | i < count; | |
1138 | ++i, | |
1139 | pov += plt_entry_size, | |
1140 | got_pov += 4, | |
1141 | plt_offset += plt_entry_size, | |
1142 | plt_rel_offset += rel_size, | |
1143 | got_offset += 4) | |
1144 | { | |
1145 | // Set and adjust the PLT entry itself. | |
1146 | ||
374ad285 | 1147 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1148 | { |
1149 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
1150 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1151 | } | |
1152 | else | |
1153 | { | |
1154 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
1155 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1156 | (got_address | |
1157 | + got_offset)); | |
1158 | } | |
1159 | ||
1160 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1161 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1162 | - (plt_offset + plt_entry_size)); | |
1163 | ||
1164 | // Set the entry in the GOT. | |
1165 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1166 | } | |
1167 | ||
7223e9ca ILT |
1168 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1169 | // the GOT to point to the actual symbol value, rather than point to | |
1170 | // the PLT entry. That will let the dynamic linker call the right | |
1171 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1172 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1173 | for (std::vector<Global_ifunc>::const_iterator p = |
1174 | this->global_ifuncs_.begin(); | |
1175 | p != this->global_ifuncs_.end(); | |
1176 | ++p) | |
1177 | { | |
1178 | const Sized_symbol<32>* ssym = | |
1179 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1180 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1181 | ssym->value()); |
1182 | } | |
1183 | ||
1184 | for (std::vector<Local_ifunc>::const_iterator p = | |
1185 | this->local_ifuncs_.begin(); | |
1186 | p != this->local_ifuncs_.end(); | |
1187 | ++p) | |
1188 | { | |
1189 | const Symbol_value<32>* psymval = | |
1190 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1191 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1192 | psymval->value(p->object, 0)); |
1193 | } | |
1194 | ||
fe8718a4 ILT |
1195 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1196 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1197 | |
2ea97941 | 1198 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1199 | of->write_output_view(got_file_offset, got_size, got_view); |
1200 | } | |
1201 | ||
7223e9ca | 1202 | // Create the PLT section. |
a3ad94ed ILT |
1203 | |
1204 | void | |
7223e9ca | 1205 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1206 | { |
a3ad94ed ILT |
1207 | if (this->plt_ == NULL) |
1208 | { | |
1209 | // Create the GOT sections first. | |
7e1edb90 | 1210 | this->got_section(symtab, layout); |
a3ad94ed | 1211 | |
67181c72 ILT |
1212 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_, |
1213 | this->got_irelative_); | |
16649710 ILT |
1214 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1215 | (elfcpp::SHF_ALLOC | |
1216 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1217 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1218 | |
1219 | // Make the sh_info field of .rel.plt point to .plt. | |
1220 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1221 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1222 | } |
7223e9ca | 1223 | } |
a3ad94ed | 1224 | |
7223e9ca ILT |
1225 | // Create a PLT entry for a global symbol. |
1226 | ||
1227 | void | |
1228 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1229 | { | |
1230 | if (gsym->has_plt_offset()) | |
1231 | return; | |
1232 | if (this->plt_ == NULL) | |
1233 | this->make_plt_section(symtab, layout); | |
67181c72 | 1234 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1235 | } |
1236 | ||
7223e9ca ILT |
1237 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1238 | ||
1239 | void | |
1240 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1241 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1242 | unsigned int local_sym_index) |
1243 | { | |
1244 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1245 | return; | |
1246 | if (this->plt_ == NULL) | |
1247 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1248 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1249 | relobj, | |
7223e9ca ILT |
1250 | local_sym_index); |
1251 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1252 | } | |
1253 | ||
0e70b911 CC |
1254 | // Return the number of entries in the PLT. |
1255 | ||
1256 | unsigned int | |
1257 | Target_i386::plt_entry_count() const | |
1258 | { | |
1259 | if (this->plt_ == NULL) | |
1260 | return 0; | |
1261 | return this->plt_->entry_count(); | |
1262 | } | |
1263 | ||
1264 | // Return the offset of the first non-reserved PLT entry. | |
1265 | ||
1266 | unsigned int | |
1267 | Target_i386::first_plt_entry_offset() const | |
1268 | { | |
1269 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1270 | } | |
1271 | ||
1272 | // Return the size of each PLT entry. | |
1273 | ||
1274 | unsigned int | |
1275 | Target_i386::plt_entry_size() const | |
1276 | { | |
1277 | return Output_data_plt_i386::get_plt_entry_size(); | |
1278 | } | |
1279 | ||
e291e7b9 ILT |
1280 | // Get the section to use for TLS_DESC relocations. |
1281 | ||
1282 | Target_i386::Reloc_section* | |
1283 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1284 | { | |
1285 | return this->plt_section()->rel_tls_desc(layout); | |
1286 | } | |
1287 | ||
9fa33bee | 1288 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1289 | |
1290 | void | |
1291 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1292 | { | |
1293 | if (this->tls_base_symbol_defined_) | |
1294 | return; | |
1295 | ||
1296 | Output_segment* tls_segment = layout->tls_segment(); | |
1297 | if (tls_segment != NULL) | |
1298 | { | |
183fd0e3 | 1299 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1300 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1301 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1302 | tls_segment, 0, 0, |
1303 | elfcpp::STT_TLS, | |
1304 | elfcpp::STB_LOCAL, | |
1305 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1306 | (is_exec |
1307 | ? Symbol::SEGMENT_END | |
1308 | : Symbol::SEGMENT_START), | |
1309 | true); | |
edfbb029 CC |
1310 | } |
1311 | this->tls_base_symbol_defined_ = true; | |
1312 | } | |
1313 | ||
94c4710f ILT |
1314 | // Create a GOT entry for the TLS module index. |
1315 | ||
1316 | unsigned int | |
1317 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1318 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1319 | { |
1320 | if (this->got_mod_index_offset_ == -1U) | |
1321 | { | |
1322 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1323 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1324 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1325 | unsigned int got_offset = got->add_constant(0); | |
1326 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1327 | got_offset); | |
009a67a2 | 1328 | got->add_constant(0); |
94c4710f ILT |
1329 | this->got_mod_index_offset_ = got_offset; |
1330 | } | |
1331 | return this->got_mod_index_offset_; | |
1332 | } | |
1333 | ||
92e059d8 | 1334 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1335 | // symbol. IS_FINAL is true if the final address of this symbol is |
1336 | // known at link time. | |
92e059d8 | 1337 | |
af6359d5 | 1338 | tls::Tls_optimization |
7e1edb90 | 1339 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1340 | { |
1341 | // If we are generating a shared library, then we can't do anything | |
1342 | // in the linker. | |
8851ecca | 1343 | if (parameters->options().shared()) |
af6359d5 | 1344 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1345 | |
1346 | switch (r_type) | |
1347 | { | |
1348 | case elfcpp::R_386_TLS_GD: | |
1349 | case elfcpp::R_386_TLS_GOTDESC: | |
1350 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1351 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1352 | // access. Since we know that we are generating an executable, |
1353 | // we can convert this to Initial-Exec. If we also know that | |
1354 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1355 | if (is_final) |
af6359d5 ILT |
1356 | return tls::TLSOPT_TO_LE; |
1357 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1358 | |
1359 | case elfcpp::R_386_TLS_LDM: | |
1360 | // This is Local-Dynamic, which refers to a local symbol in the | |
1361 | // dynamic TLS block. Since we know that we generating an | |
1362 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1363 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1364 | |
1365 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1366 | // Another type of Local-Dynamic relocation. |
1367 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1368 | |
1369 | case elfcpp::R_386_TLS_IE: | |
1370 | case elfcpp::R_386_TLS_GOTIE: | |
1371 | case elfcpp::R_386_TLS_IE_32: | |
1372 | // These are Initial-Exec relocs which get the thread offset | |
1373 | // from the GOT. If we know that we are linking against the | |
1374 | // local symbol, we can switch to Local-Exec, which links the | |
1375 | // thread offset into the instruction. | |
a3ad94ed | 1376 | if (is_final) |
af6359d5 ILT |
1377 | return tls::TLSOPT_TO_LE; |
1378 | return tls::TLSOPT_NONE; | |
8462ae85 | 1379 | |
92e059d8 ILT |
1380 | case elfcpp::R_386_TLS_LE: |
1381 | case elfcpp::R_386_TLS_LE_32: | |
1382 | // When we already have Local-Exec, there is nothing further we | |
1383 | // can do. | |
af6359d5 | 1384 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1385 | |
1386 | default: | |
a3ad94ed | 1387 | gold_unreachable(); |
92e059d8 ILT |
1388 | } |
1389 | } | |
1390 | ||
95a2c8d6 | 1391 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1392 | |
95a2c8d6 RS |
1393 | int |
1394 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1395 | { |
1396 | switch (r_type) | |
1397 | { | |
1398 | case elfcpp::R_386_NONE: | |
1399 | case elfcpp::R_386_GNU_VTINHERIT: | |
1400 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1401 | case elfcpp::R_386_GOTPC: |
1402 | // No symbol reference. | |
1403 | return 0; | |
7223e9ca ILT |
1404 | |
1405 | case elfcpp::R_386_32: | |
1406 | case elfcpp::R_386_16: | |
1407 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1408 | return Symbol::ABSOLUTE_REF; |
1409 | ||
7223e9ca ILT |
1410 | case elfcpp::R_386_PC32: |
1411 | case elfcpp::R_386_PC16: | |
1412 | case elfcpp::R_386_PC8: | |
7223e9ca | 1413 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1414 | return Symbol::RELATIVE_REF; |
1415 | ||
1416 | case elfcpp::R_386_PLT32: | |
1417 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1418 | ||
7223e9ca | 1419 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1420 | // Absolute in GOT. |
1421 | return Symbol::ABSOLUTE_REF; | |
1422 | ||
1423 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1424 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1425 | case elfcpp::R_386_TLS_DESC_CALL: | |
1426 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1427 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1428 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1429 | case elfcpp::R_386_TLS_IE_32: | |
1430 | case elfcpp::R_386_TLS_GOTIE: | |
1431 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1432 | case elfcpp::R_386_TLS_LE_32: | |
1433 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1434 | |
1435 | case elfcpp::R_386_COPY: | |
1436 | case elfcpp::R_386_GLOB_DAT: | |
1437 | case elfcpp::R_386_JUMP_SLOT: | |
1438 | case elfcpp::R_386_RELATIVE: | |
1439 | case elfcpp::R_386_IRELATIVE: | |
1440 | case elfcpp::R_386_TLS_TPOFF: | |
1441 | case elfcpp::R_386_TLS_DTPMOD32: | |
1442 | case elfcpp::R_386_TLS_DTPOFF32: | |
1443 | case elfcpp::R_386_TLS_TPOFF32: | |
1444 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1445 | case elfcpp::R_386_32PLT: |
1446 | case elfcpp::R_386_TLS_GD_32: | |
1447 | case elfcpp::R_386_TLS_GD_PUSH: | |
1448 | case elfcpp::R_386_TLS_GD_CALL: | |
1449 | case elfcpp::R_386_TLS_GD_POP: | |
1450 | case elfcpp::R_386_TLS_LDM_32: | |
1451 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1452 | case elfcpp::R_386_TLS_LDM_CALL: | |
1453 | case elfcpp::R_386_TLS_LDM_POP: | |
1454 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1455 | default: | |
95a2c8d6 RS |
1456 | // Not expected. We will give an error later. |
1457 | return 0; | |
7223e9ca ILT |
1458 | } |
1459 | } | |
1460 | ||
95a2c8d6 RS |
1461 | // Report an unsupported relocation against a local symbol. |
1462 | ||
1463 | void | |
6fa2a40b | 1464 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1465 | unsigned int r_type) |
1466 | { | |
1467 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1468 | object->name().c_str(), r_type); | |
1469 | } | |
1470 | ||
1471 | // Return whether we need to make a PLT entry for a relocation of a | |
1472 | // given type against a STT_GNU_IFUNC symbol. | |
1473 | ||
1474 | bool | |
6fa2a40b CC |
1475 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1476 | Sized_relobj_file<32, false>* object, | |
1477 | unsigned int r_type) | |
95a2c8d6 RS |
1478 | { |
1479 | int flags = Scan::get_reference_flags(r_type); | |
1480 | if (flags & Symbol::TLS_REF) | |
1481 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1482 | object->name().c_str(), r_type); | |
1483 | return flags != 0; | |
1484 | } | |
1485 | ||
92e059d8 ILT |
1486 | // Scan a relocation for a local symbol. |
1487 | ||
1488 | inline void | |
ad0f2072 | 1489 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1490 | Layout* layout, |
1491 | Target_i386* target, | |
6fa2a40b | 1492 | Sized_relobj_file<32, false>* object, |
1b64748b | 1493 | unsigned int data_shndx, |
07f397ab | 1494 | Output_section* output_section, |
1b64748b | 1495 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1496 | unsigned int r_type, |
7bf1f802 | 1497 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1498 | { |
7223e9ca ILT |
1499 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1500 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1501 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1502 | { | |
1503 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1504 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1505 | } | |
1506 | ||
92e059d8 ILT |
1507 | switch (r_type) |
1508 | { | |
1509 | case elfcpp::R_386_NONE: | |
1510 | case elfcpp::R_386_GNU_VTINHERIT: | |
1511 | case elfcpp::R_386_GNU_VTENTRY: | |
1512 | break; | |
1513 | ||
1514 | case elfcpp::R_386_32: | |
436ca963 ILT |
1515 | // If building a shared library (or a position-independent |
1516 | // executable), we need to create a dynamic relocation for | |
1517 | // this location. The relocation applied at link time will | |
1518 | // apply the link-time value, so we flag the location with | |
1519 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1520 | // relocate it easily. | |
8851ecca | 1521 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1522 | { |
1523 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1524 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1525 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1526 | output_section, data_shndx, | |
1527 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1528 | } |
1529 | break; | |
1530 | ||
1531 | case elfcpp::R_386_16: | |
1532 | case elfcpp::R_386_8: | |
1533 | // If building a shared library (or a position-independent | |
1534 | // executable), we need to create a dynamic relocation for | |
1535 | // this location. Because the addend needs to remain in the | |
1536 | // data section, we need to be careful not to apply this | |
1537 | // relocation statically. | |
8851ecca | 1538 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1539 | { |
1540 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1541 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1542 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1543 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1544 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1545 | else |
1546 | { | |
1547 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1548 | unsigned int shndx = lsym.get_st_shndx(); |
1549 | bool is_ordinary; | |
1550 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1551 | &is_ordinary); | |
1552 | if (!is_ordinary) | |
1553 | object->error(_("section symbol %u has bad shndx %u"), | |
1554 | r_sym, shndx); | |
1555 | else | |
1556 | rel_dyn->add_local_section(object, shndx, | |
1557 | r_type, output_section, | |
1558 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1559 | } |
436ca963 | 1560 | } |
92e059d8 ILT |
1561 | break; |
1562 | ||
1563 | case elfcpp::R_386_PC32: | |
1564 | case elfcpp::R_386_PC16: | |
1565 | case elfcpp::R_386_PC8: | |
1566 | break; | |
1567 | ||
df2efe71 ILT |
1568 | case elfcpp::R_386_PLT32: |
1569 | // Since we know this is a local symbol, we can handle this as a | |
1570 | // PC32 reloc. | |
1571 | break; | |
1572 | ||
ead1e424 ILT |
1573 | case elfcpp::R_386_GOTOFF: |
1574 | case elfcpp::R_386_GOTPC: | |
1575 | // We need a GOT section. | |
7e1edb90 | 1576 | target->got_section(symtab, layout); |
ead1e424 ILT |
1577 | break; |
1578 | ||
1b64748b ILT |
1579 | case elfcpp::R_386_GOT32: |
1580 | { | |
1581 | // The symbol requires a GOT entry. | |
1582 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1583 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1584 | |
1585 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1586 | // lets function pointers compare correctly with shared | |
1587 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1588 | bool is_new; | |
1589 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1590 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1591 | else | |
1592 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1593 | if (is_new) | |
1b64748b ILT |
1594 | { |
1595 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1596 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1597 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1598 | { |
1599 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1600 | unsigned int got_offset = |
1601 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1602 | rel_dyn->add_local_relative(object, r_sym, | |
1603 | elfcpp::R_386_RELATIVE, | |
1604 | got, got_offset); | |
1b64748b ILT |
1605 | } |
1606 | } | |
1607 | } | |
1608 | break; | |
1609 | ||
af6359d5 ILT |
1610 | // These are relocations which should only be seen by the |
1611 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1612 | case elfcpp::R_386_COPY: |
1613 | case elfcpp::R_386_GLOB_DAT: | |
1614 | case elfcpp::R_386_JUMP_SLOT: | |
1615 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1616 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1617 | case elfcpp::R_386_TLS_TPOFF: |
1618 | case elfcpp::R_386_TLS_DTPMOD32: | |
1619 | case elfcpp::R_386_TLS_DTPOFF32: | |
1620 | case elfcpp::R_386_TLS_TPOFF32: | |
1621 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1622 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1623 | object->name().c_str(), r_type); |
92e059d8 ILT |
1624 | break; |
1625 | ||
af6359d5 | 1626 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1627 | // linking. |
56622147 ILT |
1628 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1629 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1630 | case elfcpp::R_386_TLS_DESC_CALL: | |
1631 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1632 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1633 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1634 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1635 | case elfcpp::R_386_TLS_GOTIE: |
1636 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1637 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1638 | { |
8851ecca | 1639 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1640 | const tls::Tls_optimization optimized_type |
1641 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1642 | switch (r_type) |
1643 | { | |
56622147 | 1644 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1645 | if (optimized_type == tls::TLSOPT_NONE) |
1646 | { | |
1647 | // Create a pair of GOT entries for the module index and | |
1648 | // dtv-relative offset. | |
1649 | Output_data_got<32, false>* got | |
1650 | = target->got_section(symtab, layout); | |
1651 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1652 | unsigned int shndx = lsym.get_st_shndx(); |
1653 | bool is_ordinary; | |
1654 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1655 | if (!is_ordinary) | |
1656 | object->error(_("local symbol %u has bad shndx %u"), | |
1657 | r_sym, shndx); | |
1658 | else | |
1659 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1660 | GOT_TYPE_TLS_PAIR, | |
1661 | target->rel_dyn_section(layout), | |
1662 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1663 | } |
1664 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1665 | unsupported_reloc_local(object, r_type); | |
1666 | break; | |
1667 | ||
56622147 | 1668 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1669 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1670 | if (optimized_type == tls::TLSOPT_NONE) |
1671 | { | |
a8df5856 ILT |
1672 | // Create a double GOT entry with an R_386_TLS_DESC |
1673 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1674 | // lazily, so the GOT entry needs to be in an area in | |
1675 | // .got.plt, not .got. Call got_section to make sure | |
1676 | // the section has been created. | |
1677 | target->got_section(symtab, layout); | |
1678 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1679 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1680 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1681 | { | |
1682 | unsigned int got_offset = got->add_constant(0); | |
1683 | // The local symbol value is stored in the second | |
1684 | // GOT entry. | |
1685 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1686 | // That set the GOT offset of the local symbol to | |
1687 | // point to the second entry, but we want it to | |
1688 | // point to the first. | |
1689 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1690 | got_offset); | |
1691 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1692 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1693 | } | |
c2b45e22 CC |
1694 | } |
1695 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1696 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1697 | break; |
1698 | ||
c2b45e22 CC |
1699 | case elfcpp::R_386_TLS_DESC_CALL: |
1700 | break; | |
1701 | ||
56622147 | 1702 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1703 | if (optimized_type == tls::TLSOPT_NONE) |
1704 | { | |
1705 | // Create a GOT entry for the module index. | |
94c4710f | 1706 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1707 | } |
1708 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1709 | unsupported_reloc_local(object, r_type); |
1710 | break; | |
1711 | ||
56622147 | 1712 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1713 | break; |
1714 | ||
56622147 ILT |
1715 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1716 | case elfcpp::R_386_TLS_IE_32: | |
1717 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1718 | layout->set_has_static_tls(); |
07f397ab ILT |
1719 | if (optimized_type == tls::TLSOPT_NONE) |
1720 | { | |
7bf1f802 ILT |
1721 | // For the R_386_TLS_IE relocation, we need to create a |
1722 | // dynamic relocation when building a shared library. | |
1723 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1724 | && parameters->options().shared()) |
7bf1f802 ILT |
1725 | { |
1726 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1727 | unsigned int r_sym |
1728 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1729 | rel_dyn->add_local_relative(object, r_sym, | |
1730 | elfcpp::R_386_RELATIVE, | |
1731 | output_section, data_shndx, | |
1732 | reloc.get_r_offset()); | |
7bf1f802 | 1733 | } |
07f397ab ILT |
1734 | // Create a GOT entry for the tp-relative offset. |
1735 | Output_data_got<32, false>* got | |
1736 | = target->got_section(symtab, layout); | |
1737 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1738 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1739 | ? elfcpp::R_386_TLS_TPOFF32 | |
1740 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1741 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1742 | ? GOT_TYPE_TLS_OFFSET | |
1743 | : GOT_TYPE_TLS_NOFFSET); | |
1744 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1745 | target->rel_dyn_section(layout), |
1746 | dyn_r_type); | |
07f397ab ILT |
1747 | } |
1748 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1749 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1750 | break; |
af6359d5 | 1751 | |
56622147 ILT |
1752 | case elfcpp::R_386_TLS_LE: // Local-exec |
1753 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1754 | layout->set_has_static_tls(); |
07f397ab | 1755 | if (output_is_shared) |
7bf1f802 ILT |
1756 | { |
1757 | // We need to create a dynamic relocation. | |
dceae3c1 | 1758 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1759 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1760 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1761 | ? elfcpp::R_386_TLS_TPOFF32 | |
1762 | : elfcpp::R_386_TLS_TPOFF); | |
1763 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1764 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1765 | data_shndx, reloc.get_r_offset()); | |
1766 | } | |
56622147 ILT |
1767 | break; |
1768 | ||
af6359d5 ILT |
1769 | default: |
1770 | gold_unreachable(); | |
7e1edb90 ILT |
1771 | } |
1772 | } | |
92e059d8 ILT |
1773 | break; |
1774 | ||
92e059d8 ILT |
1775 | case elfcpp::R_386_32PLT: |
1776 | case elfcpp::R_386_TLS_GD_32: | |
1777 | case elfcpp::R_386_TLS_GD_PUSH: | |
1778 | case elfcpp::R_386_TLS_GD_CALL: | |
1779 | case elfcpp::R_386_TLS_GD_POP: | |
1780 | case elfcpp::R_386_TLS_LDM_32: | |
1781 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1782 | case elfcpp::R_386_TLS_LDM_CALL: | |
1783 | case elfcpp::R_386_TLS_LDM_POP: | |
1784 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1785 | default: | |
af6359d5 | 1786 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1787 | break; |
1788 | } | |
1789 | } | |
1790 | ||
af6359d5 ILT |
1791 | // Report an unsupported relocation against a global symbol. |
1792 | ||
1793 | void | |
6fa2a40b CC |
1794 | Target_i386::Scan::unsupported_reloc_global( |
1795 | Sized_relobj_file<32, false>* object, | |
1796 | unsigned int r_type, | |
1797 | Symbol* gsym) | |
af6359d5 | 1798 | { |
75f2446e | 1799 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1800 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1801 | } |
1802 | ||
0897ed3b ST |
1803 | inline bool |
1804 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1805 | { | |
1806 | switch (r_type) | |
1807 | { | |
1808 | case elfcpp::R_386_32: | |
1809 | case elfcpp::R_386_16: | |
1810 | case elfcpp::R_386_8: | |
1811 | case elfcpp::R_386_GOTOFF: | |
1812 | case elfcpp::R_386_GOT32: | |
1813 | { | |
1814 | return true; | |
1815 | } | |
1816 | default: | |
1817 | return false; | |
1818 | } | |
1819 | return false; | |
1820 | } | |
1821 | ||
1822 | inline bool | |
1823 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1824 | Symbol_table* , | |
1825 | Layout* , | |
1826 | Target_i386* , | |
6fa2a40b | 1827 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1828 | unsigned int , |
1829 | Output_section* , | |
1830 | const elfcpp::Rel<32, false>& , | |
1831 | unsigned int r_type, | |
1832 | const elfcpp::Sym<32, false>&) | |
1833 | { | |
1834 | return possible_function_pointer_reloc(r_type); | |
1835 | } | |
1836 | ||
1837 | inline bool | |
1838 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1839 | Symbol_table* , | |
1840 | Layout* , | |
1841 | Target_i386* , | |
6fa2a40b | 1842 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1843 | unsigned int , |
1844 | Output_section* , | |
1845 | const elfcpp::Rel<32, false>& , | |
1846 | unsigned int r_type, | |
1847 | Symbol*) | |
1848 | { | |
1849 | return possible_function_pointer_reloc(r_type); | |
1850 | } | |
1851 | ||
92e059d8 ILT |
1852 | // Scan a relocation for a global symbol. |
1853 | ||
1854 | inline void | |
ad0f2072 | 1855 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1856 | Layout* layout, |
1857 | Target_i386* target, | |
6fa2a40b | 1858 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 1859 | unsigned int data_shndx, |
07f397ab | 1860 | Output_section* output_section, |
a3ad94ed ILT |
1861 | const elfcpp::Rel<32, false>& reloc, |
1862 | unsigned int r_type, | |
92e059d8 ILT |
1863 | Symbol* gsym) |
1864 | { | |
7223e9ca ILT |
1865 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1866 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1867 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1868 | target->make_plt_entry(symtab, layout, gsym); | |
1869 | ||
92e059d8 ILT |
1870 | switch (r_type) |
1871 | { | |
1872 | case elfcpp::R_386_NONE: | |
1873 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1874 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1875 | break; |
1876 | ||
1877 | case elfcpp::R_386_32: | |
92e059d8 | 1878 | case elfcpp::R_386_16: |
92e059d8 | 1879 | case elfcpp::R_386_8: |
96f2030e | 1880 | { |
d61c6bd4 ILT |
1881 | // Make a PLT entry if necessary. |
1882 | if (gsym->needs_plt_entry()) | |
1883 | { | |
1884 | target->make_plt_entry(symtab, layout, gsym); | |
1885 | // Since this is not a PC-relative relocation, we may be | |
1886 | // taking the address of a function. In that case we need to | |
1887 | // set the entry in the dynamic symbol table to the address of | |
1888 | // the PLT entry. | |
8851ecca | 1889 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1890 | gsym->set_needs_dynsym_value(); |
1891 | } | |
1892 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1893 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1894 | { |
966d4097 | 1895 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1896 | { |
12c0daef | 1897 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1898 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1899 | } |
7223e9ca ILT |
1900 | else if (r_type == elfcpp::R_386_32 |
1901 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1902 | && gsym->can_use_relative_reloc(false) | |
1903 | && !gsym->is_from_dynobj() | |
1904 | && !gsym->is_undefined() | |
1905 | && !gsym->is_preemptible()) | |
1906 | { | |
1907 | // Use an IRELATIVE reloc for a locally defined | |
1908 | // STT_GNU_IFUNC symbol. This makes a function | |
1909 | // address in a PIE executable match the address in a | |
1910 | // shared library that it links against. | |
67181c72 | 1911 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
1912 | rel_dyn->add_symbolless_global_addend(gsym, |
1913 | elfcpp::R_386_IRELATIVE, | |
1914 | output_section, | |
1915 | object, data_shndx, | |
1916 | reloc.get_r_offset()); | |
1917 | } | |
d61c6bd4 ILT |
1918 | else if (r_type == elfcpp::R_386_32 |
1919 | && gsym->can_use_relative_reloc(false)) | |
1920 | { | |
1921 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1922 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1923 | output_section, object, | |
1924 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1925 | } |
1926 | else | |
1927 | { | |
96f2030e | 1928 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1929 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1930 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1931 | } |
1932 | } | |
1933 | } | |
1934 | break; | |
1935 | ||
1936 | case elfcpp::R_386_PC32: | |
1937 | case elfcpp::R_386_PC16: | |
1938 | case elfcpp::R_386_PC8: | |
1939 | { | |
1940 | // Make a PLT entry if necessary. | |
1941 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1942 | { |
1943 | // These relocations are used for function calls only in | |
1944 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1945 | // we'll need a text relocation anyway, so we can skip the | |
1946 | // PLT entry and let the dynamic linker bind the call directly | |
1947 | // to the target. For smaller relocations, we should use a | |
1948 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1949 | if (!parameters->options().shared() |
7bf1f802 ILT |
1950 | || r_type != elfcpp::R_386_PC32) |
1951 | target->make_plt_entry(symtab, layout, gsym); | |
1952 | } | |
d61c6bd4 | 1953 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1954 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1955 | { |
966d4097 | 1956 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1957 | { |
12c0daef | 1958 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1959 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1960 | } |
86849f1f | 1961 | else |
d61c6bd4 ILT |
1962 | { |
1963 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1964 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1965 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1966 | } |
96f2030e ILT |
1967 | } |
1968 | } | |
92e059d8 ILT |
1969 | break; |
1970 | ||
ead1e424 | 1971 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1972 | { |
1973 | // The symbol requires a GOT entry. | |
7e1edb90 | 1974 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1975 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1976 | { |
1977 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1978 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1979 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1980 | else | |
1981 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1982 | } | |
7bf1f802 ILT |
1983 | else |
1984 | { | |
8462ae85 | 1985 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1986 | // GOT entry with a dynamic relocation. |
1987 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1988 | if (gsym->is_from_dynobj() |
1989 | || gsym->is_undefined() | |
7223e9ca ILT |
1990 | || gsym->is_preemptible() |
1991 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1992 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
1993 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1994 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1995 | else |
8462ae85 | 1996 | { |
7223e9ca ILT |
1997 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1998 | // offset into the GOT, so that function pointer | |
1999 | // comparisons work correctly. | |
2000 | bool is_new; | |
2001 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2002 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2003 | else | |
2004 | { | |
2005 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2006 | // Tell the dynamic linker to use the PLT address | |
2007 | // when resolving relocations. | |
2008 | if (gsym->is_from_dynobj() | |
2009 | && !parameters->options().shared()) | |
2010 | gsym->set_needs_dynsym_value(); | |
2011 | } | |
2012 | if (is_new) | |
2013 | { | |
2014 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2015 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2016 | got, got_off); | |
2017 | } | |
8462ae85 ILT |
2018 | } |
2019 | } | |
2020 | } | |
ead1e424 ILT |
2021 | break; |
2022 | ||
2023 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2024 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2025 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2026 | if (gsym->final_value_is_known()) |
ead1e424 | 2027 | break; |
436ca963 ILT |
2028 | // If building a shared library, we can also skip the PLT entry |
2029 | // if the symbol is defined in the output file and is protected | |
2030 | // or hidden. | |
2031 | if (gsym->is_defined() | |
2032 | && !gsym->is_from_dynobj() | |
2033 | && !gsym->is_preemptible()) | |
2034 | break; | |
7e1edb90 | 2035 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2036 | break; |
2037 | ||
2038 | case elfcpp::R_386_GOTOFF: | |
2039 | case elfcpp::R_386_GOTPC: | |
2040 | // We need a GOT section. | |
7e1edb90 | 2041 | target->got_section(symtab, layout); |
ead1e424 ILT |
2042 | break; |
2043 | ||
af6359d5 ILT |
2044 | // These are relocations which should only be seen by the |
2045 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2046 | case elfcpp::R_386_COPY: |
2047 | case elfcpp::R_386_GLOB_DAT: | |
2048 | case elfcpp::R_386_JUMP_SLOT: | |
2049 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2050 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2051 | case elfcpp::R_386_TLS_TPOFF: |
2052 | case elfcpp::R_386_TLS_DTPMOD32: | |
2053 | case elfcpp::R_386_TLS_DTPOFF32: | |
2054 | case elfcpp::R_386_TLS_TPOFF32: | |
2055 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2056 | gold_error(_("%s: unexpected reloc %u in object file"), |
2057 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2058 | break; |
2059 | ||
d61c17ea ILT |
2060 | // These are initial tls relocs, which are expected when |
2061 | // linking. | |
56622147 ILT |
2062 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2063 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2064 | case elfcpp::R_386_TLS_DESC_CALL: | |
2065 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2066 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2067 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2068 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2069 | case elfcpp::R_386_TLS_GOTIE: |
2070 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2071 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2072 | { |
7e1edb90 | 2073 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
2074 | const tls::Tls_optimization optimized_type |
2075 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
2076 | switch (r_type) |
2077 | { | |
56622147 | 2078 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2079 | if (optimized_type == tls::TLSOPT_NONE) |
2080 | { | |
2081 | // Create a pair of GOT entries for the module index and | |
2082 | // dtv-relative offset. | |
2083 | Output_data_got<32, false>* got | |
2084 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2085 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
2086 | target->rel_dyn_section(layout), |
2087 | elfcpp::R_386_TLS_DTPMOD32, | |
2088 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2089 | } |
2090 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2091 | { | |
2092 | // Create a GOT entry for the tp-relative offset. | |
2093 | Output_data_got<32, false>* got | |
2094 | = target->got_section(symtab, layout); | |
c2b45e22 | 2095 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 2096 | target->rel_dyn_section(layout), |
c2b45e22 | 2097 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
2098 | } |
2099 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2100 | unsupported_reloc_global(object, r_type, gsym); | |
2101 | break; | |
2102 | ||
56622147 | 2103 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2104 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2105 | if (optimized_type == tls::TLSOPT_NONE) |
2106 | { | |
a8df5856 ILT |
2107 | // Create a double GOT entry with an R_386_TLS_DESC |
2108 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2109 | // lazily, so the GOT entry needs to be in an area in | |
2110 | // .got.plt, not .got. Call got_section to make sure | |
2111 | // the section has been created. | |
2112 | target->got_section(symtab, layout); | |
2113 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
2114 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2115 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
2116 | elfcpp::R_386_TLS_DESC, 0); |
2117 | } | |
2118 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2119 | { | |
2120 | // Create a GOT entry for the tp-relative offset. | |
2121 | Output_data_got<32, false>* got | |
2122 | = target->got_section(symtab, layout); | |
2123 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2124 | target->rel_dyn_section(layout), | |
2125 | elfcpp::R_386_TLS_TPOFF); | |
2126 | } | |
2127 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2128 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
2129 | break; |
2130 | ||
2131 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2132 | break; |
2133 | ||
56622147 | 2134 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2135 | if (optimized_type == tls::TLSOPT_NONE) |
2136 | { | |
2137 | // Create a GOT entry for the module index. | |
94c4710f | 2138 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
2139 | } |
2140 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2141 | unsupported_reloc_global(object, r_type, gsym); |
2142 | break; | |
2143 | ||
56622147 | 2144 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2145 | break; |
2146 | ||
56622147 ILT |
2147 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2148 | case elfcpp::R_386_TLS_IE_32: | |
2149 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2150 | layout->set_has_static_tls(); |
07f397ab ILT |
2151 | if (optimized_type == tls::TLSOPT_NONE) |
2152 | { | |
7bf1f802 ILT |
2153 | // For the R_386_TLS_IE relocation, we need to create a |
2154 | // dynamic relocation when building a shared library. | |
2155 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 2156 | && parameters->options().shared()) |
07f397ab | 2157 | { |
07f397ab | 2158 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
2159 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2160 | output_section, object, | |
2161 | data_shndx, | |
2162 | reloc.get_r_offset()); | |
07f397ab | 2163 | } |
7bf1f802 ILT |
2164 | // Create a GOT entry for the tp-relative offset. |
2165 | Output_data_got<32, false>* got | |
2166 | = target->got_section(symtab, layout); | |
2167 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2168 | ? elfcpp::R_386_TLS_TPOFF32 | |
2169 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
2170 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2171 | ? GOT_TYPE_TLS_OFFSET | |
2172 | : GOT_TYPE_TLS_NOFFSET); | |
2173 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
2174 | target->rel_dyn_section(layout), |
2175 | dyn_r_type); | |
07f397ab ILT |
2176 | } |
2177 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2178 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2179 | break; |
af6359d5 | 2180 | |
56622147 ILT |
2181 | case elfcpp::R_386_TLS_LE: // Local-exec |
2182 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2183 | layout->set_has_static_tls(); |
8851ecca | 2184 | if (parameters->options().shared()) |
7bf1f802 ILT |
2185 | { |
2186 | // We need to create a dynamic relocation. | |
2187 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2188 | ? elfcpp::R_386_TLS_TPOFF32 | |
2189 | : elfcpp::R_386_TLS_TPOFF); | |
2190 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2191 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2192 | data_shndx, reloc.get_r_offset()); | |
2193 | } | |
56622147 ILT |
2194 | break; |
2195 | ||
af6359d5 ILT |
2196 | default: |
2197 | gold_unreachable(); | |
a3ad94ed ILT |
2198 | } |
2199 | } | |
92e059d8 ILT |
2200 | break; |
2201 | ||
92e059d8 ILT |
2202 | case elfcpp::R_386_32PLT: |
2203 | case elfcpp::R_386_TLS_GD_32: | |
2204 | case elfcpp::R_386_TLS_GD_PUSH: | |
2205 | case elfcpp::R_386_TLS_GD_CALL: | |
2206 | case elfcpp::R_386_TLS_GD_POP: | |
2207 | case elfcpp::R_386_TLS_LDM_32: | |
2208 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2209 | case elfcpp::R_386_TLS_LDM_CALL: | |
2210 | case elfcpp::R_386_TLS_LDM_POP: | |
2211 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2212 | default: | |
af6359d5 | 2213 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2214 | break; |
2215 | } | |
2216 | } | |
2217 | ||
6d03d481 ST |
2218 | // Process relocations for gc. |
2219 | ||
2220 | void | |
ad0f2072 | 2221 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 2222 | Layout* layout, |
6fa2a40b | 2223 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
2224 | unsigned int data_shndx, |
2225 | unsigned int, | |
2226 | const unsigned char* prelocs, | |
2227 | size_t reloc_count, | |
2228 | Output_section* output_section, | |
2229 | bool needs_special_offset_handling, | |
2230 | size_t local_symbol_count, | |
2231 | const unsigned char* plocal_symbols) | |
2232 | { | |
2233 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2234 | Target_i386::Scan, |
2235 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2236 | symtab, |
2237 | layout, | |
2238 | this, | |
2239 | object, | |
2240 | data_shndx, | |
2241 | prelocs, | |
2242 | reloc_count, | |
2243 | output_section, | |
2244 | needs_special_offset_handling, | |
2245 | local_symbol_count, | |
2246 | plocal_symbols); | |
2247 | } | |
2248 | ||
92e059d8 ILT |
2249 | // Scan relocations for a section. |
2250 | ||
2251 | void | |
ad0f2072 | 2252 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2253 | Layout* layout, |
6fa2a40b | 2254 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 2255 | unsigned int data_shndx, |
92e059d8 ILT |
2256 | unsigned int sh_type, |
2257 | const unsigned char* prelocs, | |
2258 | size_t reloc_count, | |
730cdc88 ILT |
2259 | Output_section* output_section, |
2260 | bool needs_special_offset_handling, | |
92e059d8 | 2261 | size_t local_symbol_count, |
730cdc88 | 2262 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2263 | { |
2264 | if (sh_type == elfcpp::SHT_RELA) | |
2265 | { | |
75f2446e ILT |
2266 | gold_error(_("%s: unsupported RELA reloc section"), |
2267 | object->name().c_str()); | |
2268 | return; | |
92e059d8 ILT |
2269 | } |
2270 | ||
ead1e424 ILT |
2271 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2272 | Target_i386::Scan>( | |
92e059d8 | 2273 | symtab, |
ead1e424 ILT |
2274 | layout, |
2275 | this, | |
92e059d8 | 2276 | object, |
a3ad94ed | 2277 | data_shndx, |
92e059d8 ILT |
2278 | prelocs, |
2279 | reloc_count, | |
730cdc88 ILT |
2280 | output_section, |
2281 | needs_special_offset_handling, | |
92e059d8 | 2282 | local_symbol_count, |
730cdc88 | 2283 | plocal_symbols); |
92e059d8 ILT |
2284 | } |
2285 | ||
16649710 | 2286 | // Finalize the sections. |
5a6f7e2d ILT |
2287 | |
2288 | void | |
f59f41f3 DK |
2289 | Target_i386::do_finalize_sections( |
2290 | Layout* layout, | |
2291 | const Input_objects*, | |
e785ec03 | 2292 | Symbol_table* symtab) |
5a6f7e2d | 2293 | { |
ea715a34 ILT |
2294 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2295 | ? NULL | |
2296 | : this->plt_->rel_plt()); | |
2297 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2298 | this->rel_dyn_, true, false); |
16649710 ILT |
2299 | |
2300 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2301 | // relocs. | |
12c0daef ILT |
2302 | if (this->copy_relocs_.any_saved_relocs()) |
2303 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2304 | |
2305 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2306 | // the .got.plt section. | |
2307 | Symbol* sym = this->global_offset_table_; | |
2308 | if (sym != NULL) | |
2309 | { | |
2310 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2311 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2312 | } | |
28a13fec | 2313 | |
67181c72 ILT |
2314 | if (parameters->doing_static_link() |
2315 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2316 | { |
2317 | // If linking statically, make sure that the __rel_iplt symbols | |
2318 | // were defined if necessary, even if we didn't create a PLT. | |
2319 | static const Define_symbol_in_segment syms[] = | |
2320 | { | |
2321 | { | |
2322 | "__rel_iplt_start", // name | |
2323 | elfcpp::PT_LOAD, // segment_type | |
2324 | elfcpp::PF_W, // segment_flags_set | |
2325 | elfcpp::PF(0), // segment_flags_clear | |
2326 | 0, // value | |
2327 | 0, // size | |
2328 | elfcpp::STT_NOTYPE, // type | |
2329 | elfcpp::STB_GLOBAL, // binding | |
2330 | elfcpp::STV_HIDDEN, // visibility | |
2331 | 0, // nonvis | |
2332 | Symbol::SEGMENT_START, // offset_from_base | |
2333 | true // only_if_ref | |
2334 | }, | |
2335 | { | |
2336 | "__rel_iplt_end", // name | |
2337 | elfcpp::PT_LOAD, // segment_type | |
2338 | elfcpp::PF_W, // segment_flags_set | |
2339 | elfcpp::PF(0), // segment_flags_clear | |
2340 | 0, // value | |
2341 | 0, // size | |
2342 | elfcpp::STT_NOTYPE, // type | |
2343 | elfcpp::STB_GLOBAL, // binding | |
2344 | elfcpp::STV_HIDDEN, // visibility | |
2345 | 0, // nonvis | |
2346 | Symbol::SEGMENT_START, // offset_from_base | |
2347 | true // only_if_ref | |
2348 | } | |
2349 | }; | |
2350 | ||
2351 | symtab->define_symbols(layout, 2, syms, | |
2352 | layout->script_options()->saw_sections_clause()); | |
2353 | } | |
5a6f7e2d ILT |
2354 | } |
2355 | ||
86849f1f ILT |
2356 | // Return whether a direct absolute static relocation needs to be applied. |
2357 | // In cases where Scan::local() or Scan::global() has created | |
2358 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2359 | // of the relocation is carried in the data, and we must not | |
2360 | // apply the static relocation. | |
2361 | ||
2362 | inline bool | |
2363 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2364 | unsigned int r_type, |
031cdbed ILT |
2365 | bool is_32bit, |
2366 | Output_section* output_section) | |
86849f1f | 2367 | { |
031cdbed ILT |
2368 | // If the output section is not allocated, then we didn't call |
2369 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2370 | // the reloc here. | |
2371 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2372 | return true; | |
2373 | ||
95a2c8d6 RS |
2374 | int ref_flags = Scan::get_reference_flags(r_type); |
2375 | ||
d61c6bd4 ILT |
2376 | // For local symbols, we will have created a non-RELATIVE dynamic |
2377 | // relocation only if (a) the output is position independent, | |
2378 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2379 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2380 | if (gsym == NULL) |
8851ecca | 2381 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2382 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2383 | && !is_32bit); |
86849f1f | 2384 | |
0700cf32 ILT |
2385 | // For global symbols, we use the same helper routines used in the |
2386 | // scan pass. If we did not create a dynamic relocation, or if we | |
2387 | // created a RELATIVE dynamic relocation, we should apply the static | |
2388 | // relocation. | |
2389 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2390 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2391 | && gsym->can_use_relative_reloc(ref_flags | |
2392 | & Symbol::FUNCTION_CALL); | |
2393 | return !has_dyn || is_rel; | |
86849f1f ILT |
2394 | } |
2395 | ||
61ba1cf9 ILT |
2396 | // Perform a relocation. |
2397 | ||
ead1e424 | 2398 | inline bool |
92e059d8 | 2399 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2400 | Target_i386* target, |
ca09d69a | 2401 | Output_section* output_section, |
92e059d8 ILT |
2402 | size_t relnum, |
2403 | const elfcpp::Rel<32, false>& rel, | |
2404 | unsigned int r_type, | |
c06b7b0b | 2405 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2406 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2407 | unsigned char* view, |
2408 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2409 | section_size_type view_size) |
61ba1cf9 | 2410 | { |
ead1e424 ILT |
2411 | if (this->skip_call_tls_get_addr_) |
2412 | { | |
5efc7cd2 CC |
2413 | if ((r_type != elfcpp::R_386_PLT32 |
2414 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2415 | || gsym == NULL |
2416 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2417 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2418 | _("missing expected TLS relocation")); | |
2419 | else | |
ead1e424 | 2420 | { |
75f2446e ILT |
2421 | this->skip_call_tls_get_addr_ = false; |
2422 | return false; | |
ead1e424 | 2423 | } |
ead1e424 ILT |
2424 | } |
2425 | ||
6fa2a40b | 2426 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2427 | |
a3ad94ed | 2428 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2429 | Symbol_value<32> symval; |
436ca963 | 2430 | if (gsym != NULL |
7223e9ca ILT |
2431 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2432 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2433 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2434 | && gsym->can_use_relative_reloc(false) |
2435 | && !gsym->is_from_dynobj() | |
2436 | && !gsym->is_undefined() | |
2437 | && !gsym->is_preemptible()) | |
2438 | { | |
2439 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2440 | // want to use the real value of the symbol, not the PLT offset. | |
2441 | } | |
2442 | else if (gsym != NULL | |
95a2c8d6 | 2443 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2444 | { |
67181c72 | 2445 | symval.set_output_value(target->plt_address_for_global(gsym) |
b8e6aad9 ILT |
2446 | + gsym->plt_offset()); |
2447 | psymval = &symval; | |
a3ad94ed | 2448 | } |
7223e9ca ILT |
2449 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2450 | { | |
2451 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2452 | if (object->local_has_plt_offset(r_sym)) | |
2453 | { | |
67181c72 | 2454 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
2455 | + object->local_plt_offset(r_sym)); |
2456 | psymval = &symval; | |
2457 | } | |
2458 | } | |
b8e6aad9 | 2459 | |
1b64748b | 2460 | // Get the GOT offset if needed. |
96f2030e ILT |
2461 | // The GOT pointer points to the end of the GOT section. |
2462 | // We need to subtract the size of the GOT section to get | |
2463 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2464 | bool have_got_offset = false; |
2465 | unsigned int got_offset = 0; | |
2466 | switch (r_type) | |
2467 | { | |
2468 | case elfcpp::R_386_GOT32: | |
2469 | if (gsym != NULL) | |
2470 | { | |
0a65a3a7 CC |
2471 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2472 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2473 | - target->got_size()); | |
1b64748b ILT |
2474 | } |
2475 | else | |
2476 | { | |
2477 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2478 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2479 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2480 | - target->got_size()); | |
1b64748b ILT |
2481 | } |
2482 | have_got_offset = true; | |
2483 | break; | |
2484 | ||
2485 | default: | |
2486 | break; | |
2487 | } | |
2488 | ||
61ba1cf9 ILT |
2489 | switch (r_type) |
2490 | { | |
2491 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2492 | case elfcpp::R_386_GNU_VTINHERIT: |
2493 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2494 | break; |
2495 | ||
2496 | case elfcpp::R_386_32: | |
95a2c8d6 | 2497 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2498 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2499 | break; |
2500 | ||
2501 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2502 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2503 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2504 | break; |
2505 | ||
2506 | case elfcpp::R_386_16: | |
95a2c8d6 | 2507 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2508 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2509 | break; |
2510 | ||
2511 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2512 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2513 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2514 | break; |
2515 | ||
92e059d8 | 2516 | case elfcpp::R_386_8: |
95a2c8d6 | 2517 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2518 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2519 | break; |
2520 | ||
2521 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2522 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2523 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2524 | break; |
2525 | ||
ead1e424 | 2526 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2527 | gold_assert(gsym == NULL |
2528 | || gsym->has_plt_offset() | |
99f8faca ILT |
2529 | || gsym->final_value_is_known() |
2530 | || (gsym->is_defined() | |
2531 | && !gsym->is_from_dynobj() | |
2532 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2533 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2534 | break; |
2535 | ||
2536 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2537 | gold_assert(have_got_offset); |
2538 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2539 | break; |
2540 | ||
2541 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2542 | { |
2543 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2544 | value = (psymval->value(object, 0) | |
96f2030e | 2545 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2546 | Relocate_functions<32, false>::rel32(view, value); |
2547 | } | |
ead1e424 ILT |
2548 | break; |
2549 | ||
2550 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2551 | { |
2552 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2553 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2554 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2555 | } | |
ead1e424 ILT |
2556 | break; |
2557 | ||
92e059d8 ILT |
2558 | case elfcpp::R_386_COPY: |
2559 | case elfcpp::R_386_GLOB_DAT: | |
2560 | case elfcpp::R_386_JUMP_SLOT: | |
2561 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2562 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2563 | // These are outstanding tls relocs, which are unexpected when |
2564 | // linking. | |
92e059d8 ILT |
2565 | case elfcpp::R_386_TLS_TPOFF: |
2566 | case elfcpp::R_386_TLS_DTPMOD32: | |
2567 | case elfcpp::R_386_TLS_DTPOFF32: | |
2568 | case elfcpp::R_386_TLS_TPOFF32: | |
2569 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2570 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2571 | _("unexpected reloc %u in object file"), | |
2572 | r_type); | |
92e059d8 ILT |
2573 | break; |
2574 | ||
d61c17ea ILT |
2575 | // These are initial tls relocs, which are expected when |
2576 | // linking. | |
56622147 ILT |
2577 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2578 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2579 | case elfcpp::R_386_TLS_DESC_CALL: | |
2580 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2581 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2582 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2583 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2584 | case elfcpp::R_386_TLS_GOTIE: |
2585 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2586 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2587 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2588 | view, address, view_size); | |
92e059d8 ILT |
2589 | break; |
2590 | ||
92e059d8 ILT |
2591 | case elfcpp::R_386_32PLT: |
2592 | case elfcpp::R_386_TLS_GD_32: | |
2593 | case elfcpp::R_386_TLS_GD_PUSH: | |
2594 | case elfcpp::R_386_TLS_GD_CALL: | |
2595 | case elfcpp::R_386_TLS_GD_POP: | |
2596 | case elfcpp::R_386_TLS_LDM_32: | |
2597 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2598 | case elfcpp::R_386_TLS_LDM_CALL: | |
2599 | case elfcpp::R_386_TLS_LDM_POP: | |
2600 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2601 | default: |
75f2446e ILT |
2602 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2603 | _("unsupported reloc %u"), | |
2604 | r_type); | |
92e059d8 ILT |
2605 | break; |
2606 | } | |
ead1e424 ILT |
2607 | |
2608 | return true; | |
92e059d8 ILT |
2609 | } |
2610 | ||
2611 | // Perform a TLS relocation. | |
2612 | ||
2613 | inline void | |
2614 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2615 | Target_i386* target, |
92e059d8 ILT |
2616 | size_t relnum, |
2617 | const elfcpp::Rel<32, false>& rel, | |
2618 | unsigned int r_type, | |
c06b7b0b | 2619 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2620 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2621 | unsigned char* view, |
2622 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2623 | section_size_type view_size) |
92e059d8 ILT |
2624 | { |
2625 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2626 | |
6fa2a40b | 2627 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2628 | |
2629 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2630 | |
b3705d2a ILT |
2631 | const bool is_final = (gsym == NULL |
2632 | ? !parameters->options().shared() | |
2633 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2634 | const tls::Tls_optimization optimized_type |
2635 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2636 | switch (r_type) |
2637 | { | |
56622147 | 2638 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2639 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2640 | { |
07f397ab | 2641 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2642 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2643 | rel, r_type, value, view, | |
2644 | view_size); | |
92e059d8 ILT |
2645 | break; |
2646 | } | |
07f397ab ILT |
2647 | else |
2648 | { | |
c2b45e22 CC |
2649 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2650 | ? GOT_TYPE_TLS_NOFFSET | |
2651 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2652 | unsigned int got_offset; |
2653 | if (gsym != NULL) | |
2654 | { | |
c2b45e22 CC |
2655 | gold_assert(gsym->has_got_offset(got_type)); |
2656 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2657 | } |
2658 | else | |
2659 | { | |
2660 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2661 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2662 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2663 | - target->got_size()); |
2664 | } | |
2665 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2666 | { | |
2667 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
2668 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2669 | got_offset, view, view_size); | |
07f397ab ILT |
2670 | break; |
2671 | } | |
2672 | else if (optimized_type == tls::TLSOPT_NONE) | |
2673 | { | |
2674 | // Relocate the field with the offset of the pair of GOT | |
2675 | // entries. | |
2676 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2677 | break; | |
2678 | } | |
2679 | } | |
75f2446e ILT |
2680 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2681 | _("unsupported reloc %u"), | |
2682 | r_type); | |
92e059d8 ILT |
2683 | break; |
2684 | ||
56622147 ILT |
2685 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2686 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2687 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2688 | if (optimized_type == tls::TLSOPT_TO_LE) |
2689 | { | |
2690 | gold_assert(tls_segment != NULL); | |
2691 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2692 | rel, r_type, value, view, | |
2693 | view_size); | |
2694 | break; | |
2695 | } | |
2696 | else | |
2697 | { | |
2698 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2699 | ? GOT_TYPE_TLS_NOFFSET | |
2700 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2701 | unsigned int got_offset = 0; |
2702 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2703 | && optimized_type == tls::TLSOPT_NONE) | |
2704 | { | |
2705 | // We created GOT entries in the .got.tlsdesc portion of | |
2706 | // the .got.plt section, but the offset stored in the | |
2707 | // symbol is the offset within .got.tlsdesc. | |
2708 | got_offset = (target->got_size() | |
2709 | + target->got_plt_section()->data_size()); | |
2710 | } | |
c2b45e22 CC |
2711 | if (gsym != NULL) |
2712 | { | |
2713 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2714 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2715 | } |
2716 | else | |
2717 | { | |
2718 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2719 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2720 | got_offset += (object->local_got_offset(r_sym, got_type) |
2721 | - target->got_size()); | |
c2b45e22 CC |
2722 | } |
2723 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2724 | { | |
2725 | gold_assert(tls_segment != NULL); | |
2726 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
2727 | got_offset, view, view_size); | |
2728 | break; | |
2729 | } | |
2730 | else if (optimized_type == tls::TLSOPT_NONE) | |
2731 | { | |
2732 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2733 | { | |
2734 | // Relocate the field with the offset of the pair of GOT | |
2735 | // entries. | |
2736 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2737 | } | |
2738 | break; | |
2739 | } | |
2740 | } | |
75f2446e ILT |
2741 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2742 | _("unsupported reloc %u"), | |
2743 | r_type); | |
ead1e424 ILT |
2744 | break; |
2745 | ||
56622147 | 2746 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2747 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2748 | { | |
75f2446e ILT |
2749 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2750 | _("both SUN and GNU model " | |
2751 | "TLS relocations")); | |
2752 | break; | |
46cf9fa2 ILT |
2753 | } |
2754 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2755 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2756 | { |
07f397ab | 2757 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2758 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2759 | value, view, view_size); | |
2760 | break; | |
2761 | } | |
07f397ab ILT |
2762 | else if (optimized_type == tls::TLSOPT_NONE) |
2763 | { | |
2764 | // Relocate the field with the offset of the GOT entry for | |
2765 | // the module index. | |
2766 | unsigned int got_offset; | |
94c4710f ILT |
2767 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2768 | - target->got_size()); | |
07f397ab ILT |
2769 | Relocate_functions<32, false>::rel32(view, got_offset); |
2770 | break; | |
2771 | } | |
75f2446e ILT |
2772 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2773 | _("unsupported reloc %u"), | |
2774 | r_type); | |
46cf9fa2 ILT |
2775 | break; |
2776 | ||
56622147 | 2777 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2778 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2779 | { |
82bb573a ILT |
2780 | // This reloc can appear in debugging sections, in which |
2781 | // case we must not convert to local-exec. We decide what | |
2782 | // to do based on whether the section is marked as | |
2783 | // containing executable code. That is what the GNU linker | |
2784 | // does as well. | |
2785 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2786 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2787 | { |
2788 | gold_assert(tls_segment != NULL); | |
2789 | value -= tls_segment->memsz(); | |
2790 | } | |
e8a9fcda | 2791 | } |
46cf9fa2 ILT |
2792 | Relocate_functions<32, false>::rel32(view, value); |
2793 | break; | |
2794 | ||
56622147 ILT |
2795 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2796 | case elfcpp::R_386_TLS_GOTIE: | |
2797 | case elfcpp::R_386_TLS_IE_32: | |
2798 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2799 | { | |
07f397ab | 2800 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2801 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2802 | rel, r_type, value, view, | |
2803 | view_size); | |
2804 | break; | |
2805 | } | |
07f397ab ILT |
2806 | else if (optimized_type == tls::TLSOPT_NONE) |
2807 | { | |
2808 | // Relocate the field with the offset of the GOT entry for | |
2809 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2810 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2811 | ? GOT_TYPE_TLS_OFFSET | |
2812 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2813 | unsigned int got_offset; |
2814 | if (gsym != NULL) | |
2815 | { | |
c2b45e22 CC |
2816 | gold_assert(gsym->has_got_offset(got_type)); |
2817 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2818 | } |
2819 | else | |
2820 | { | |
2821 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2822 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2823 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2824 | } |
2825 | // For the R_386_TLS_IE relocation, we need to apply the | |
2826 | // absolute address of the GOT entry. | |
2827 | if (r_type == elfcpp::R_386_TLS_IE) | |
2828 | got_offset += target->got_plt_section()->address(); | |
2829 | // All GOT offsets are relative to the end of the GOT. | |
2830 | got_offset -= target->got_size(); | |
2831 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2832 | break; | |
2833 | } | |
75f2446e ILT |
2834 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2835 | _("unsupported reloc %u"), | |
2836 | r_type); | |
92e059d8 | 2837 | break; |
92e059d8 | 2838 | |
56622147 | 2839 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2840 | // If we're creating a shared library, a dynamic relocation will |
2841 | // have been created for this location, so do not apply it now. | |
8851ecca | 2842 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2843 | { |
2844 | gold_assert(tls_segment != NULL); | |
2845 | value -= tls_segment->memsz(); | |
2846 | Relocate_functions<32, false>::rel32(view, value); | |
2847 | } | |
56622147 | 2848 | break; |
92e059d8 | 2849 | |
56622147 | 2850 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2851 | // If we're creating a shared library, a dynamic relocation will |
2852 | // have been created for this location, so do not apply it now. | |
8851ecca | 2853 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2854 | { |
2855 | gold_assert(tls_segment != NULL); | |
2856 | value = tls_segment->memsz() - value; | |
2857 | Relocate_functions<32, false>::rel32(view, value); | |
2858 | } | |
56622147 | 2859 | break; |
92e059d8 | 2860 | } |
92e059d8 ILT |
2861 | } |
2862 | ||
e041f13d | 2863 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2864 | // Local-Exec. |
2865 | ||
2866 | inline void | |
2867 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2868 | size_t relnum, | |
2869 | Output_segment* tls_segment, | |
2870 | const elfcpp::Rel<32, false>& rel, | |
2871 | unsigned int, | |
2872 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2873 | unsigned char* view, | |
fe8718a4 | 2874 | section_size_type view_size) |
ead1e424 ILT |
2875 | { |
2876 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2877 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2878 | // leal foo(%reg),%eax; call ___tls_get_addr |
2879 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2880 | ||
af6359d5 ILT |
2881 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2882 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2883 | |
2884 | unsigned char op1 = view[-1]; | |
2885 | unsigned char op2 = view[-2]; | |
2886 | ||
af6359d5 ILT |
2887 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2888 | op2 == 0x8d || op2 == 0x04); | |
2889 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2890 | |
2891 | int roff = 5; | |
2892 | ||
2893 | if (op2 == 0x04) | |
2894 | { | |
af6359d5 ILT |
2895 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2896 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2897 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2898 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2899 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2900 | } | |
2901 | else | |
2902 | { | |
af6359d5 ILT |
2903 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2904 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2905 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2906 | && view[9] == 0x90) |
ead1e424 ILT |
2907 | { |
2908 | // There is a trailing nop. Use the size byte subl. | |
2909 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2910 | roff = 6; | |
2911 | } | |
2912 | else | |
2913 | { | |
2914 | // Use the five byte subl. | |
2915 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2916 | } | |
2917 | } | |
2918 | ||
7bf1f802 | 2919 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2920 | Relocate_functions<32, false>::rel32(view + roff, value); |
2921 | ||
2922 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2923 | // We can skip it. | |
2924 | this->skip_call_tls_get_addr_ = true; | |
2925 | } | |
2926 | ||
7bf1f802 | 2927 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2928 | // Initial-Exec. |
2929 | ||
2930 | inline void | |
2931 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2932 | size_t relnum, | |
c2b45e22 | 2933 | Output_segment*, |
07f397ab ILT |
2934 | const elfcpp::Rel<32, false>& rel, |
2935 | unsigned int, | |
2936 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2937 | unsigned char* view, | |
fe8718a4 | 2938 | section_size_type view_size) |
07f397ab ILT |
2939 | { |
2940 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2941 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2942 | ||
2943 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2944 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2945 | ||
2946 | unsigned char op1 = view[-1]; | |
2947 | unsigned char op2 = view[-2]; | |
2948 | ||
2949 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2950 | op2 == 0x8d || op2 == 0x04); | |
2951 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2952 | ||
2953 | int roff = 5; | |
2954 | ||
c2b45e22 CC |
2955 | // FIXME: For now, support only the first (SIB) form. |
2956 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2957 | |
2958 | if (op2 == 0x04) | |
2959 | { | |
2960 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2961 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2962 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2963 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2964 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2965 | } | |
2966 | else | |
2967 | { | |
2968 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2969 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2970 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2971 | && view[9] == 0x90) |
2972 | { | |
2973 | // FIXME: This is not the right instruction sequence. | |
2974 | // There is a trailing nop. Use the size byte subl. | |
2975 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2976 | roff = 6; | |
2977 | } | |
2978 | else | |
2979 | { | |
2980 | // FIXME: This is not the right instruction sequence. | |
2981 | // Use the five byte subl. | |
2982 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2983 | } | |
2984 | } | |
2985 | ||
07f397ab ILT |
2986 | Relocate_functions<32, false>::rel32(view + roff, value); |
2987 | ||
2988 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2989 | // We can skip it. | |
2990 | this->skip_call_tls_get_addr_ = true; | |
2991 | } | |
2992 | ||
c2b45e22 CC |
2993 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2994 | // General-Dynamic to a Local-Exec. | |
2995 | ||
2996 | inline void | |
2997 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2998 | const Relocate_info<32, false>* relinfo, | |
2999 | size_t relnum, | |
3000 | Output_segment* tls_segment, | |
3001 | const elfcpp::Rel<32, false>& rel, | |
3002 | unsigned int r_type, | |
3003 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3004 | unsigned char* view, | |
3005 | section_size_type view_size) | |
3006 | { | |
3007 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3008 | { | |
3009 | // leal foo@TLSDESC(%ebx), %eax | |
3010 | // ==> leal foo@NTPOFF, %eax | |
3011 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3012 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3013 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3014 | view[-2] == 0x8d && view[-1] == 0x83); | |
3015 | view[-1] = 0x05; | |
3016 | value -= tls_segment->memsz(); | |
3017 | Relocate_functions<32, false>::rel32(view, value); | |
3018 | } | |
3019 | else | |
3020 | { | |
3021 | // call *foo@TLSCALL(%eax) | |
3022 | // ==> nop; nop | |
3023 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3024 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3025 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3026 | view[0] == 0xff && view[1] == 0x10); | |
3027 | view[0] = 0x66; | |
3028 | view[1] = 0x90; | |
3029 | } | |
3030 | } | |
3031 | ||
3032 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3033 | // General-Dynamic to an Initial-Exec. | |
3034 | ||
3035 | inline void | |
3036 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3037 | const Relocate_info<32, false>* relinfo, | |
3038 | size_t relnum, | |
3039 | Output_segment*, | |
3040 | const elfcpp::Rel<32, false>& rel, | |
3041 | unsigned int r_type, | |
3042 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3043 | unsigned char* view, | |
3044 | section_size_type view_size) | |
3045 | { | |
3046 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3047 | { | |
3048 | // leal foo@TLSDESC(%ebx), %eax | |
3049 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3050 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3051 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3052 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3053 | view[-2] == 0x8d && view[-1] == 0x83); | |
3054 | view[-2] = 0x8b; | |
3055 | Relocate_functions<32, false>::rel32(view, value); | |
3056 | } | |
3057 | else | |
3058 | { | |
3059 | // call *foo@TLSCALL(%eax) | |
3060 | // ==> nop; nop | |
3061 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3062 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3063 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3064 | view[0] == 0xff && view[1] == 0x10); | |
3065 | view[0] = 0x66; | |
3066 | view[1] = 0x90; | |
3067 | } | |
3068 | } | |
3069 | ||
46cf9fa2 ILT |
3070 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3071 | // Local-Exec. | |
3072 | ||
3073 | inline void | |
3074 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3075 | size_t relnum, | |
3076 | Output_segment*, | |
3077 | const elfcpp::Rel<32, false>& rel, | |
3078 | unsigned int, | |
3079 | elfcpp::Elf_types<32>::Elf_Addr, | |
3080 | unsigned char* view, | |
fe8718a4 | 3081 | section_size_type view_size) |
46cf9fa2 ILT |
3082 | { |
3083 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3084 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3085 | ||
af6359d5 ILT |
3086 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3087 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3088 | |
3089 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
3090 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
3091 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 3092 | |
af6359d5 | 3093 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3094 | |
3095 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3096 | ||
3097 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3098 | // We can skip it. | |
3099 | this->skip_call_tls_get_addr_ = true; | |
3100 | } | |
3101 | ||
56622147 ILT |
3102 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3103 | // Local-Exec. | |
3104 | ||
3105 | inline void | |
3106 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3107 | size_t relnum, | |
3108 | Output_segment* tls_segment, | |
3109 | const elfcpp::Rel<32, false>& rel, | |
3110 | unsigned int r_type, | |
3111 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3112 | unsigned char* view, | |
fe8718a4 | 3113 | section_size_type view_size) |
56622147 ILT |
3114 | { |
3115 | // We have to actually change the instructions, which means that we | |
3116 | // need to examine the opcodes to figure out which instruction we | |
3117 | // are looking at. | |
3118 | if (r_type == elfcpp::R_386_TLS_IE) | |
3119 | { | |
3120 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3121 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3122 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3123 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3124 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3125 | ||
3126 | unsigned char op1 = view[-1]; | |
3127 | if (op1 == 0xa1) | |
3128 | { | |
3129 | // movl XX,%eax ==> movl $YY,%eax | |
3130 | view[-1] = 0xb8; | |
3131 | } | |
3132 | else | |
3133 | { | |
3134 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3135 | ||
3136 | unsigned char op2 = view[-2]; | |
3137 | if (op2 == 0x8b) | |
3138 | { | |
3139 | // movl XX,%reg ==> movl $YY,%reg | |
3140 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3141 | (op1 & 0xc7) == 0x05); | |
3142 | view[-2] = 0xc7; | |
3143 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3144 | } | |
3145 | else if (op2 == 0x03) | |
3146 | { | |
3147 | // addl XX,%reg ==> addl $YY,%reg | |
3148 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3149 | (op1 & 0xc7) == 0x05); | |
3150 | view[-2] = 0x81; | |
3151 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3152 | } | |
3153 | else | |
3154 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3155 | } | |
3156 | } | |
3157 | else | |
3158 | { | |
3159 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3160 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3161 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3162 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3163 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3164 | ||
3165 | unsigned char op1 = view[-1]; | |
3166 | unsigned char op2 = view[-2]; | |
3167 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3168 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
3169 | if (op2 == 0x8b) | |
3170 | { | |
3171 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3172 | view[-2] = 0xc7; | |
3173 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3174 | } | |
3175 | else if (op2 == 0x2b) | |
3176 | { | |
3177 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3178 | view[-2] = 0x81; | |
3179 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3180 | } | |
3181 | else if (op2 == 0x03) | |
3182 | { | |
3183 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3184 | view[-2] = 0x81; | |
3185 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3186 | } | |
3187 | else | |
3188 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3189 | } | |
3190 | ||
7bf1f802 | 3191 | value = tls_segment->memsz() - value; |
56622147 ILT |
3192 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3193 | value = - value; | |
3194 | ||
3195 | Relocate_functions<32, false>::rel32(view, value); | |
3196 | } | |
3197 | ||
61ba1cf9 ILT |
3198 | // Relocate section data. |
3199 | ||
3200 | void | |
92e059d8 | 3201 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3202 | unsigned int sh_type, |
3203 | const unsigned char* prelocs, | |
3204 | size_t reloc_count, | |
730cdc88 ILT |
3205 | Output_section* output_section, |
3206 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3207 | unsigned char* view, |
3208 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3209 | section_size_type view_size, |
3210 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3211 | { |
a3ad94ed | 3212 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3213 | |
ead1e424 ILT |
3214 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
3215 | Target_i386::Relocate>( | |
92e059d8 | 3216 | relinfo, |
ead1e424 | 3217 | this, |
61ba1cf9 ILT |
3218 | prelocs, |
3219 | reloc_count, | |
730cdc88 ILT |
3220 | output_section, |
3221 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3222 | view, |
3223 | address, | |
364c7fa5 ILT |
3224 | view_size, |
3225 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3226 | } |
3227 | ||
6a74a719 ILT |
3228 | // Return the size of a relocation while scanning during a relocatable |
3229 | // link. | |
3230 | ||
3231 | unsigned int | |
3232 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3233 | unsigned int r_type, | |
3234 | Relobj* object) | |
3235 | { | |
3236 | switch (r_type) | |
3237 | { | |
3238 | case elfcpp::R_386_NONE: | |
3239 | case elfcpp::R_386_GNU_VTINHERIT: | |
3240 | case elfcpp::R_386_GNU_VTENTRY: | |
3241 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3242 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3243 | case elfcpp::R_386_TLS_DESC_CALL: | |
3244 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3245 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3246 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3247 | case elfcpp::R_386_TLS_IE_32: | |
3248 | case elfcpp::R_386_TLS_GOTIE: | |
3249 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3250 | case elfcpp::R_386_TLS_LE_32: | |
3251 | return 0; | |
3252 | ||
3253 | case elfcpp::R_386_32: | |
3254 | case elfcpp::R_386_PC32: | |
3255 | case elfcpp::R_386_GOT32: | |
3256 | case elfcpp::R_386_PLT32: | |
3257 | case elfcpp::R_386_GOTOFF: | |
3258 | case elfcpp::R_386_GOTPC: | |
3259 | return 4; | |
3260 | ||
3261 | case elfcpp::R_386_16: | |
3262 | case elfcpp::R_386_PC16: | |
3263 | return 2; | |
3264 | ||
3265 | case elfcpp::R_386_8: | |
3266 | case elfcpp::R_386_PC8: | |
3267 | return 1; | |
3268 | ||
3269 | // These are relocations which should only be seen by the | |
3270 | // dynamic linker, and should never be seen here. | |
3271 | case elfcpp::R_386_COPY: | |
3272 | case elfcpp::R_386_GLOB_DAT: | |
3273 | case elfcpp::R_386_JUMP_SLOT: | |
3274 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3275 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3276 | case elfcpp::R_386_TLS_TPOFF: |
3277 | case elfcpp::R_386_TLS_DTPMOD32: | |
3278 | case elfcpp::R_386_TLS_DTPOFF32: | |
3279 | case elfcpp::R_386_TLS_TPOFF32: | |
3280 | case elfcpp::R_386_TLS_DESC: | |
3281 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3282 | return 0; | |
3283 | ||
3284 | case elfcpp::R_386_32PLT: | |
3285 | case elfcpp::R_386_TLS_GD_32: | |
3286 | case elfcpp::R_386_TLS_GD_PUSH: | |
3287 | case elfcpp::R_386_TLS_GD_CALL: | |
3288 | case elfcpp::R_386_TLS_GD_POP: | |
3289 | case elfcpp::R_386_TLS_LDM_32: | |
3290 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3291 | case elfcpp::R_386_TLS_LDM_CALL: | |
3292 | case elfcpp::R_386_TLS_LDM_POP: | |
3293 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3294 | default: | |
3295 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3296 | return 0; | |
3297 | } | |
3298 | } | |
3299 | ||
3300 | // Scan the relocs during a relocatable link. | |
3301 | ||
3302 | void | |
ad0f2072 | 3303 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3304 | Layout* layout, |
6fa2a40b | 3305 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3306 | unsigned int data_shndx, |
3307 | unsigned int sh_type, | |
3308 | const unsigned char* prelocs, | |
3309 | size_t reloc_count, | |
3310 | Output_section* output_section, | |
3311 | bool needs_special_offset_handling, | |
3312 | size_t local_symbol_count, | |
3313 | const unsigned char* plocal_symbols, | |
3314 | Relocatable_relocs* rr) | |
3315 | { | |
3316 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3317 | ||
3318 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3319 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3320 | ||
7019cd25 | 3321 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3322 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3323 | symtab, |
3324 | layout, | |
3325 | object, | |
3326 | data_shndx, | |
3327 | prelocs, | |
3328 | reloc_count, | |
3329 | output_section, | |
3330 | needs_special_offset_handling, | |
3331 | local_symbol_count, | |
3332 | plocal_symbols, | |
3333 | rr); | |
3334 | } | |
3335 | ||
3336 | // Relocate a section during a relocatable link. | |
3337 | ||
3338 | void | |
3339 | Target_i386::relocate_for_relocatable( | |
3340 | const Relocate_info<32, false>* relinfo, | |
3341 | unsigned int sh_type, | |
3342 | const unsigned char* prelocs, | |
3343 | size_t reloc_count, | |
3344 | Output_section* output_section, | |
3345 | off_t offset_in_output_section, | |
3346 | const Relocatable_relocs* rr, | |
3347 | unsigned char* view, | |
3348 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3349 | section_size_type view_size, | |
3350 | unsigned char* reloc_view, | |
3351 | section_size_type reloc_view_size) | |
3352 | { | |
3353 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3354 | ||
7019cd25 | 3355 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3356 | relinfo, |
3357 | prelocs, | |
3358 | reloc_count, | |
3359 | output_section, | |
3360 | offset_in_output_section, | |
3361 | rr, | |
3362 | view, | |
3363 | view_address, | |
3364 | view_size, | |
3365 | reloc_view, | |
3366 | reloc_view_size); | |
3367 | } | |
3368 | ||
ab5c9e90 ILT |
3369 | // Return the value to use for a dynamic which requires special |
3370 | // treatment. This is how we support equality comparisons of function | |
3371 | // pointers across shared library boundaries, as described in the | |
3372 | // processor specific ABI supplement. | |
3373 | ||
3374 | uint64_t | |
3375 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3376 | { | |
3377 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 3378 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
ab5c9e90 ILT |
3379 | } |
3380 | ||
c51e6221 ILT |
3381 | // Return a string used to fill a code section with nops to take up |
3382 | // the specified length. | |
3383 | ||
3384 | std::string | |
8851ecca | 3385 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3386 | { |
3387 | if (length >= 16) | |
3388 | { | |
3389 | // Build a jmp instruction to skip over the bytes. | |
3390 | unsigned char jmp[5]; | |
3391 | jmp[0] = 0xe9; | |
3392 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3393 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3394 | + std::string(length - 5, '\0')); | |
3395 | } | |
3396 | ||
3397 | // Nop sequences of various lengths. | |
3398 | const char nop1[1] = { 0x90 }; // nop | |
3399 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3400 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3401 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3402 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3403 | 0x00 }; // leal 0(%esi,1),%esi | |
3404 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3405 | 0x00, 0x00 }; | |
3406 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3407 | 0x00, 0x00, 0x00 }; | |
3408 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3409 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3410 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3411 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3412 | 0x00 }; | |
3413 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3414 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3415 | 0x00, 0x00 }; | |
3416 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3417 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3418 | 0x00, 0x00, 0x00 }; | |
3419 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3420 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3421 | 0x00, 0x00, 0x00, 0x00 }; | |
3422 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3423 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3424 | 0x27, 0x00, 0x00, 0x00, | |
3425 | 0x00 }; | |
3426 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3427 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3428 | 0xbc, 0x27, 0x00, 0x00, | |
3429 | 0x00, 0x00 }; | |
3430 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3431 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3432 | 0x90, 0x90, 0x90, 0x90, | |
3433 | 0x90, 0x90, 0x90 }; | |
3434 | ||
3435 | const char* nops[16] = { | |
3436 | NULL, | |
3437 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3438 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3439 | }; | |
3440 | ||
3441 | return std::string(nops[length], length); | |
3442 | } | |
3443 | ||
02d7cd44 ILT |
3444 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3445 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3446 | // assembler can not write out the difference between two labels in | |
3447 | // different sections, so instead of using a pc-relative value they | |
3448 | // use an offset from the GOT. | |
3449 | ||
3450 | uint64_t | |
3451 | Target_i386::do_ehframe_datarel_base() const | |
3452 | { | |
3453 | gold_assert(this->global_offset_table_ != NULL); | |
3454 | Symbol* sym = this->global_offset_table_; | |
3455 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3456 | return ssym->value(); | |
3457 | } | |
3458 | ||
b6848d3c ILT |
3459 | // Return whether SYM should be treated as a call to a non-split |
3460 | // function. We don't want that to be true of a call to a | |
3461 | // get_pc_thunk function. | |
3462 | ||
3463 | bool | |
3464 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3465 | { | |
3466 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3467 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3468 | } | |
3469 | ||
364c7fa5 | 3470 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3471 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3472 | // code. We have to change the function so that it always ensures |
3473 | // that it has enough stack space to run some random function. | |
3474 | ||
3475 | void | |
3476 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3477 | section_offset_type fnoffset, | |
3478 | section_size_type fnsize, | |
3479 | unsigned char* view, | |
3480 | section_size_type view_size, | |
3481 | std::string* from, | |
3482 | std::string* to) const | |
3483 | { | |
3484 | // The function starts with a comparison of the stack pointer and a | |
3485 | // field in the TCB. This is followed by a jump. | |
3486 | ||
3487 | // cmp %gs:NN,%esp | |
3488 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3489 | && fnsize > 7) | |
3490 | { | |
3491 | // We will call __morestack if the carry flag is set after this | |
3492 | // comparison. We turn the comparison into an stc instruction | |
3493 | // and some nops. | |
3494 | view[fnoffset] = '\xf9'; | |
3495 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3496 | } | |
3497 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3498 | // lea NN(%esp),%edx |
3499 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3500 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3501 | && fnsize > 7) |
3502 | { | |
3503 | // This is loading an offset from the stack pointer for a | |
3504 | // comparison. The offset is negative, so we decrease the | |
3505 | // offset by the amount of space we need for the stack. This | |
3506 | // means we will avoid calling __morestack if there happens to | |
3507 | // be plenty of space on the stack already. | |
3508 | unsigned char* pval = view + fnoffset + 3; | |
3509 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3510 | val -= parameters->options().split_stack_adjust_size(); | |
3511 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3512 | } | |
3513 | else | |
3514 | { | |
3515 | if (!object->has_no_split_stack()) | |
3516 | object->error(_("failed to match split-stack sequence at " | |
3517 | "section %u offset %0zx"), | |
ac33a407 | 3518 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3519 | return; |
3520 | } | |
3521 | ||
3522 | // We have to change the function so that it calls | |
3523 | // __morestack_non_split instead of __morestack. The former will | |
3524 | // allocate additional stack space. | |
3525 | *from = "__morestack"; | |
3526 | *to = "__morestack_non_split"; | |
3527 | } | |
3528 | ||
14bfc3f5 ILT |
3529 | // The selector for i386 object files. |
3530 | ||
36959681 | 3531 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3532 | { |
3533 | public: | |
3534 | Target_selector_i386() | |
36959681 | 3535 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3536 | "elf32-i386", "elf32-i386-freebsd", |
3537 | "elf_i386") | |
14bfc3f5 ILT |
3538 | { } |
3539 | ||
3540 | Target* | |
e96caa79 ILT |
3541 | do_instantiate_target() |
3542 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3543 | }; |
3544 | ||
14bfc3f5 ILT |
3545 | Target_selector_i386 target_selector_i386; |
3546 | ||
3547 | } // End anonymous namespace. |