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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 | ||
7d172687 ILT |
169 | // A pointer to the Layout class, so that we can find the .dynamic |
170 | // section when we write out the GOT PLT section. | |
171 | Layout* layout_; | |
7223e9ca ILT |
172 | // The reloc section. |
173 | Reloc_section* rel_; | |
174 | // The TLS_DESC relocations, if necessary. These must follow the | |
175 | // regular PLT relocs. | |
176 | Reloc_section* tls_desc_rel_; | |
67181c72 ILT |
177 | // The IRELATIVE relocations, if necessary. These must follow the |
178 | // regular relocatoins and the TLS_DESC relocations. | |
179 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
180 | // The .got.plt section. |
181 | Output_data_space* got_plt_; | |
67181c72 ILT |
182 | // The part of the .got.plt section used for IRELATIVE relocs. |
183 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
184 | // The number of PLT entries. |
185 | unsigned int count_; | |
67181c72 ILT |
186 | // Number of PLT entries with R_386_IRELATIVE relocs. These follow |
187 | // the regular PLT entries. | |
188 | unsigned int irelative_count_; | |
7223e9ca ILT |
189 | // Global STT_GNU_IFUNC symbols. |
190 | std::vector<Global_ifunc> global_ifuncs_; | |
191 | // Local STT_GNU_IFUNC symbols. | |
192 | std::vector<Local_ifunc> local_ifuncs_; | |
193 | }; | |
a3ad94ed | 194 | |
14bfc3f5 | 195 | // The i386 target class. |
e041f13d ILT |
196 | // TLS info comes from |
197 | // http://people.redhat.com/drepper/tls.pdf | |
198 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 199 | |
200b2bb9 | 200 | class Target_i386 : public Sized_target<32, false> |
14bfc3f5 ILT |
201 | { |
202 | public: | |
5a6f7e2d ILT |
203 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
204 | ||
14bfc3f5 | 205 | Target_i386() |
200b2bb9 | 206 | : Sized_target<32, false>(&i386_info), |
67181c72 ILT |
207 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
208 | got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL), | |
209 | rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), | |
edfbb029 | 210 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 211 | { } |
75f65a3e | 212 | |
6d03d481 ST |
213 | // Process the relocations to determine unreferenced sections for |
214 | // garbage collection. | |
215 | void | |
ad0f2072 | 216 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 217 | Layout* layout, |
6fa2a40b | 218 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
219 | unsigned int data_shndx, |
220 | unsigned int sh_type, | |
221 | const unsigned char* prelocs, | |
222 | size_t reloc_count, | |
223 | Output_section* output_section, | |
224 | bool needs_special_offset_handling, | |
225 | size_t local_symbol_count, | |
226 | const unsigned char* plocal_symbols); | |
227 | ||
92e059d8 | 228 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 229 | void |
ad0f2072 | 230 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 231 | Layout* layout, |
6fa2a40b | 232 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 233 | unsigned int data_shndx, |
92e059d8 ILT |
234 | unsigned int sh_type, |
235 | const unsigned char* prelocs, | |
236 | size_t reloc_count, | |
730cdc88 ILT |
237 | Output_section* output_section, |
238 | bool needs_special_offset_handling, | |
92e059d8 | 239 | size_t local_symbol_count, |
730cdc88 | 240 | const unsigned char* plocal_symbols); |
61ba1cf9 | 241 | |
5a6f7e2d ILT |
242 | // Finalize the sections. |
243 | void | |
f59f41f3 | 244 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 245 | |
ab5c9e90 ILT |
246 | // Return the value to use for a dynamic which requires special |
247 | // treatment. | |
248 | uint64_t | |
249 | do_dynsym_value(const Symbol*) const; | |
250 | ||
92e059d8 ILT |
251 | // Relocate a section. |
252 | void | |
253 | relocate_section(const Relocate_info<32, false>*, | |
254 | unsigned int sh_type, | |
255 | const unsigned char* prelocs, | |
256 | size_t reloc_count, | |
730cdc88 ILT |
257 | Output_section* output_section, |
258 | bool needs_special_offset_handling, | |
92e059d8 ILT |
259 | unsigned char* view, |
260 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
261 | section_size_type view_size, |
262 | const Reloc_symbol_changes*); | |
92e059d8 | 263 | |
6a74a719 ILT |
264 | // Scan the relocs during a relocatable link. |
265 | void | |
ad0f2072 | 266 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 267 | Layout* layout, |
6fa2a40b | 268 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
269 | unsigned int data_shndx, |
270 | unsigned int sh_type, | |
271 | const unsigned char* prelocs, | |
272 | size_t reloc_count, | |
273 | Output_section* output_section, | |
274 | bool needs_special_offset_handling, | |
275 | size_t local_symbol_count, | |
276 | const unsigned char* plocal_symbols, | |
277 | Relocatable_relocs*); | |
278 | ||
279 | // Relocate a section during a relocatable link. | |
280 | void | |
281 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
282 | unsigned int sh_type, | |
283 | const unsigned char* prelocs, | |
284 | size_t reloc_count, | |
285 | Output_section* output_section, | |
286 | off_t offset_in_output_section, | |
287 | const Relocatable_relocs*, | |
288 | unsigned char* view, | |
289 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
290 | section_size_type view_size, | |
291 | unsigned char* reloc_view, | |
292 | section_size_type reloc_view_size); | |
293 | ||
c51e6221 ILT |
294 | // Return a string used to fill a code section with nops. |
295 | std::string | |
8851ecca | 296 | do_code_fill(section_size_type length) const; |
c51e6221 | 297 | |
9a2d6984 ILT |
298 | // Return whether SYM is defined by the ABI. |
299 | bool | |
9c2d0ef9 | 300 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
301 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
302 | ||
bb04269c DK |
303 | // Return whether a symbol name implies a local label. The UnixWare |
304 | // 2.1 cc generates temporary symbols that start with .X, so we | |
305 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
306 | // If so, we should move the .X recognition into | |
307 | // Target::do_is_local_label_name. | |
308 | bool | |
309 | do_is_local_label_name(const char* name) const | |
310 | { | |
311 | if (name[0] == '.' && name[1] == 'X') | |
312 | return true; | |
313 | return Target::do_is_local_label_name(name); | |
314 | } | |
315 | ||
67181c72 ILT |
316 | // Return the PLT address to use for a global symbol. |
317 | uint64_t | |
318 | do_plt_address_for_global(const Symbol* gsym) const | |
319 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 320 | |
67181c72 ILT |
321 | uint64_t |
322 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
323 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 324 | |
b3ce541e ILT |
325 | // We can tell whether we take the address of a function. |
326 | inline bool | |
327 | do_can_check_for_function_pointers() const | |
328 | { return true; } | |
329 | ||
02d7cd44 ILT |
330 | // Return the base for a DW_EH_PE_datarel encoding. |
331 | uint64_t | |
332 | do_ehframe_datarel_base() const; | |
333 | ||
b6848d3c ILT |
334 | // Return whether SYM is call to a non-split function. |
335 | bool | |
336 | do_is_call_to_non_split(const Symbol* sym, unsigned int) const; | |
337 | ||
9b547ce6 | 338 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
339 | void |
340 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
341 | section_offset_type fnoffset, section_size_type fnsize, | |
342 | unsigned char* view, section_size_type view_size, | |
343 | std::string* from, std::string* to) const; | |
344 | ||
96f2030e | 345 | // Return the size of the GOT section. |
fe8718a4 | 346 | section_size_type |
0e70b911 | 347 | got_size() const |
96f2030e ILT |
348 | { |
349 | gold_assert(this->got_ != NULL); | |
350 | return this->got_->data_size(); | |
351 | } | |
352 | ||
0e70b911 CC |
353 | // Return the number of entries in the GOT. |
354 | unsigned int | |
355 | got_entry_count() const | |
356 | { | |
357 | if (this->got_ == NULL) | |
358 | return 0; | |
359 | return this->got_size() / 4; | |
360 | } | |
361 | ||
362 | // Return the number of entries in the PLT. | |
363 | unsigned int | |
364 | plt_entry_count() const; | |
365 | ||
366 | // Return the offset of the first non-reserved PLT entry. | |
367 | unsigned int | |
368 | first_plt_entry_offset() const; | |
369 | ||
370 | // Return the size of each PLT entry. | |
371 | unsigned int | |
372 | plt_entry_size() const; | |
373 | ||
92e059d8 ILT |
374 | private: |
375 | // The class which scans relocations. | |
376 | struct Scan | |
61ba1cf9 | 377 | { |
95a2c8d6 RS |
378 | static inline int |
379 | ||
380 | get_reference_flags(unsigned int r_type); | |
381 | ||
61ba1cf9 | 382 | inline void |
ad0f2072 | 383 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 384 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 385 | unsigned int data_shndx, |
07f397ab | 386 | Output_section* output_section, |
92e059d8 ILT |
387 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
388 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 389 | |
92e059d8 | 390 | inline void |
ad0f2072 | 391 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
6fa2a40b | 392 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 393 | unsigned int data_shndx, |
07f397ab | 394 | Output_section* output_section, |
92e059d8 ILT |
395 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
396 | Symbol* gsym); | |
af6359d5 | 397 | |
21bb3914 | 398 | inline bool |
0897ed3b ST |
399 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
400 | Target_i386* target, | |
6fa2a40b | 401 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
402 | unsigned int data_shndx, |
403 | Output_section* output_section, | |
404 | const elfcpp::Rel<32, false>& reloc, | |
405 | unsigned int r_type, | |
406 | const elfcpp::Sym<32, false>& lsym); | |
407 | ||
408 | inline bool | |
409 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
410 | Target_i386* target, | |
6fa2a40b | 411 | Sized_relobj_file<32, false>* object, |
0897ed3b ST |
412 | unsigned int data_shndx, |
413 | Output_section* output_section, | |
414 | const elfcpp::Rel<32, false>& reloc, | |
415 | unsigned int r_type, | |
416 | Symbol* gsym); | |
21bb3914 ST |
417 | |
418 | inline bool | |
0897ed3b | 419 | possible_function_pointer_reloc(unsigned int r_type); |
21bb3914 | 420 | |
7223e9ca | 421 | bool |
6fa2a40b CC |
422 | reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*, |
423 | unsigned int r_type); | |
7223e9ca | 424 | |
af6359d5 | 425 | static void |
6fa2a40b | 426 | unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type); |
af6359d5 ILT |
427 | |
428 | static void | |
6fa2a40b | 429 | unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type, |
af6359d5 | 430 | Symbol*); |
61ba1cf9 ILT |
431 | }; |
432 | ||
92e059d8 ILT |
433 | // The class which implements relocation. |
434 | class Relocate | |
435 | { | |
436 | public: | |
ead1e424 | 437 | Relocate() |
46cf9fa2 | 438 | : skip_call_tls_get_addr_(false), |
82bb573a | 439 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
440 | { } |
441 | ||
442 | ~Relocate() | |
443 | { | |
444 | if (this->skip_call_tls_get_addr_) | |
445 | { | |
446 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 447 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
448 | } |
449 | } | |
450 | ||
86849f1f ILT |
451 | // Return whether the static relocation needs to be applied. |
452 | inline bool | |
453 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 454 | unsigned int r_type, |
031cdbed ILT |
455 | bool is_32bit, |
456 | Output_section* output_section); | |
86849f1f | 457 | |
ead1e424 ILT |
458 | // Do a relocation. Return false if the caller should not issue |
459 | // any warnings about this relocation. | |
460 | inline bool | |
031cdbed ILT |
461 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
462 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 463 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 464 | const Symbol_value<32>*, |
92e059d8 | 465 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 466 | section_size_type); |
92e059d8 ILT |
467 | |
468 | private: | |
469 | // Do a TLS relocation. | |
ead1e424 | 470 | inline void |
07f397ab ILT |
471 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
472 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 473 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 474 | const Symbol_value<32>*, |
fe8718a4 ILT |
475 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
476 | section_size_type); | |
92e059d8 | 477 | |
07f397ab ILT |
478 | // Do a TLS General-Dynamic to Initial-Exec transition. |
479 | inline void | |
480 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
481 | Output_segment* tls_segment, | |
482 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
483 | elfcpp::Elf_types<32>::Elf_Addr value, | |
484 | unsigned char* view, | |
fe8718a4 | 485 | section_size_type view_size); |
07f397ab | 486 | |
56622147 ILT |
487 | // Do a TLS General-Dynamic to Local-Exec transition. |
488 | inline void | |
489 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
490 | Output_segment* tls_segment, |
491 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
492 | elfcpp::Elf_types<32>::Elf_Addr value, | |
493 | unsigned char* view, | |
fe8718a4 | 494 | section_size_type view_size); |
92e059d8 | 495 | |
c2b45e22 CC |
496 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
497 | // transition. | |
498 | inline void | |
499 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
500 | Output_segment* tls_segment, | |
501 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
502 | elfcpp::Elf_types<32>::Elf_Addr value, | |
503 | unsigned char* view, | |
504 | section_size_type view_size); | |
505 | ||
506 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
507 | // transition. | |
508 | inline void | |
509 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
510 | Output_segment* tls_segment, | |
511 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
512 | elfcpp::Elf_types<32>::Elf_Addr value, | |
513 | unsigned char* view, | |
514 | section_size_type view_size); | |
515 | ||
56622147 | 516 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 517 | inline void |
56622147 | 518 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
519 | Output_segment* tls_segment, |
520 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
521 | elfcpp::Elf_types<32>::Elf_Addr value, | |
522 | unsigned char* view, | |
fe8718a4 | 523 | section_size_type view_size); |
ead1e424 | 524 | |
56622147 ILT |
525 | // Do a TLS Initial-Exec to Local-Exec transition. |
526 | static inline void | |
527 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
528 | Output_segment* tls_segment, |
529 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
530 | elfcpp::Elf_types<32>::Elf_Addr value, | |
531 | unsigned char* view, | |
fe8718a4 | 532 | section_size_type view_size); |
46cf9fa2 | 533 | |
46cf9fa2 ILT |
534 | // We need to keep track of which type of local dynamic relocation |
535 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
536 | enum Local_dynamic_type | |
537 | { | |
538 | LOCAL_DYNAMIC_NONE, | |
539 | LOCAL_DYNAMIC_SUN, | |
540 | LOCAL_DYNAMIC_GNU | |
541 | }; | |
542 | ||
ead1e424 ILT |
543 | // This is set if we should skip the next reloc, which should be a |
544 | // PLT32 reloc against ___tls_get_addr. | |
545 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
546 | // The type of local dynamic relocation we have seen in the section |
547 | // being relocated, if any. | |
548 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
549 | }; |
550 | ||
6a74a719 ILT |
551 | // A class which returns the size required for a relocation type, |
552 | // used while scanning relocs during a relocatable link. | |
553 | class Relocatable_size_for_reloc | |
554 | { | |
555 | public: | |
556 | unsigned int | |
557 | get_size_for_reloc(unsigned int, Relobj*); | |
558 | }; | |
559 | ||
92e059d8 ILT |
560 | // Adjust TLS relocation type based on the options and whether this |
561 | // is a local symbol. | |
af6359d5 | 562 | static tls::Tls_optimization |
7e1edb90 | 563 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 564 | |
ead1e424 | 565 | // Get the GOT section, creating it if necessary. |
dbe717ef | 566 | Output_data_got<32, false>* |
7e1edb90 | 567 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 568 | |
96f2030e ILT |
569 | // Get the GOT PLT section. |
570 | Output_data_space* | |
571 | got_plt_section() const | |
572 | { | |
573 | gold_assert(this->got_plt_ != NULL); | |
574 | return this->got_plt_; | |
575 | } | |
576 | ||
a8df5856 ILT |
577 | // Get the GOT section for TLSDESC entries. |
578 | Output_data_got<32, false>* | |
579 | got_tlsdesc_section() const | |
580 | { | |
581 | gold_assert(this->got_tlsdesc_ != NULL); | |
582 | return this->got_tlsdesc_; | |
583 | } | |
584 | ||
7223e9ca ILT |
585 | // Create the PLT section. |
586 | void | |
587 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
588 | ||
a3ad94ed ILT |
589 | // Create a PLT entry for a global symbol. |
590 | void | |
7e1edb90 | 591 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 592 | |
7223e9ca ILT |
593 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
594 | void | |
595 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
6fa2a40b | 596 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
597 | unsigned int local_sym_index); |
598 | ||
9fa33bee | 599 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
600 | void |
601 | define_tls_base_symbol(Symbol_table*, Layout*); | |
602 | ||
94c4710f ILT |
603 | // Create a GOT entry for the TLS module index. |
604 | unsigned int | |
605 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 606 | Sized_relobj_file<32, false>* object); |
94c4710f | 607 | |
a3ad94ed | 608 | // Get the PLT section. |
e291e7b9 | 609 | Output_data_plt_i386* |
a3ad94ed ILT |
610 | plt_section() const |
611 | { | |
612 | gold_assert(this->plt_ != NULL); | |
613 | return this->plt_; | |
614 | } | |
615 | ||
5a6f7e2d ILT |
616 | // Get the dynamic reloc section, creating it if necessary. |
617 | Reloc_section* | |
618 | rel_dyn_section(Layout*); | |
619 | ||
e291e7b9 ILT |
620 | // Get the section to use for TLS_DESC relocations. |
621 | Reloc_section* | |
622 | rel_tls_desc_section(Layout*) const; | |
623 | ||
67181c72 ILT |
624 | // Get the section to use for IRELATIVE relocations. |
625 | Reloc_section* | |
626 | rel_irelative_section(Layout*); | |
627 | ||
12c0daef | 628 | // Add a potential copy relocation. |
a3ad94ed | 629 | void |
ef9beddf | 630 | copy_reloc(Symbol_table* symtab, Layout* layout, |
6fa2a40b | 631 | Sized_relobj_file<32, false>* object, |
12c0daef ILT |
632 | unsigned int shndx, Output_section* output_section, |
633 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
634 | { | |
635 | this->copy_relocs_.copy_reloc(symtab, layout, | |
636 | symtab->get_sized_symbol<32>(sym), | |
637 | object, shndx, output_section, reloc, | |
638 | this->rel_dyn_section(layout)); | |
639 | } | |
ead1e424 | 640 | |
92e059d8 ILT |
641 | // Information about this specific target which we pass to the |
642 | // general Target structure. | |
75f65a3e | 643 | static const Target::Target_info i386_info; |
ead1e424 | 644 | |
0a65a3a7 | 645 | // The types of GOT entries needed for this platform. |
0e70b911 CC |
646 | // These values are exposed to the ABI in an incremental link. |
647 | // Do not renumber existing values without changing the version | |
648 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
649 | enum Got_type |
650 | { | |
651 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
652 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
653 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
654 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
655 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
656 | }; |
657 | ||
ead1e424 | 658 | // The GOT section. |
dbe717ef | 659 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
660 | // The PLT section. |
661 | Output_data_plt_i386* plt_; | |
662 | // The GOT PLT section. | |
663 | Output_data_space* got_plt_; | |
67181c72 ILT |
664 | // The GOT section for IRELATIVE relocations. |
665 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
666 | // The GOT section for TLSDESC relocations. |
667 | Output_data_got<32, false>* got_tlsdesc_; | |
e785ec03 ILT |
668 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
669 | Symbol* global_offset_table_; | |
5a6f7e2d ILT |
670 | // The dynamic reloc section. |
671 | Reloc_section* rel_dyn_; | |
67181c72 ILT |
672 | // The section to use for IRELATIVE relocs. |
673 | Reloc_section* rel_irelative_; | |
5a6f7e2d | 674 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 675 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
676 | // Space for variables copied with a COPY reloc. |
677 | Output_data_space* dynbss_; | |
c2b45e22 | 678 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 679 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
680 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
681 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
682 | }; |
683 | ||
684 | const Target::Target_info Target_i386::i386_info = | |
685 | { | |
61ba1cf9 ILT |
686 | 32, // size |
687 | false, // is_big_endian | |
688 | elfcpp::EM_386, // machine_code | |
689 | false, // has_make_symbol | |
dbe717ef | 690 | false, // has_resolve |
c51e6221 | 691 | true, // has_code_fill |
35cdfc9a | 692 | true, // is_default_stack_executable |
b3ce541e | 693 | true, // can_icf_inline_merge_sections |
0864d551 | 694 | '\0', // wrap_char |
dbe717ef | 695 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 696 | 0x08048000, // default_text_segment_address |
cd72c291 | 697 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
698 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
699 | elfcpp::SHN_UNDEF, // small_common_shndx | |
700 | elfcpp::SHN_UNDEF, // large_common_shndx | |
701 | 0, // small_common_section_flags | |
05a352e6 DK |
702 | 0, // large_common_section_flags |
703 | NULL, // attributes_section | |
704 | NULL // attributes_vendor | |
14bfc3f5 ILT |
705 | }; |
706 | ||
ead1e424 ILT |
707 | // Get the GOT section, creating it if necessary. |
708 | ||
dbe717ef | 709 | Output_data_got<32, false>* |
7e1edb90 | 710 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
711 | { |
712 | if (this->got_ == NULL) | |
713 | { | |
7e1edb90 | 714 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 715 | |
7e1edb90 | 716 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 717 | |
9446efde ILT |
718 | // When using -z now, we can treat .got.plt as a relro section. |
719 | // Without -z now, it is modified after program startup by lazy | |
720 | // PLT relocations. | |
721 | bool is_got_plt_relro = parameters->options().now(); | |
722 | Output_section_order got_order = (is_got_plt_relro | |
723 | ? ORDER_RELRO | |
724 | : ORDER_RELRO_LAST); | |
725 | Output_section_order got_plt_order = (is_got_plt_relro | |
726 | ? ORDER_RELRO | |
727 | : ORDER_NON_RELRO_FIRST); | |
728 | ||
82742395 ILT |
729 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
730 | (elfcpp::SHF_ALLOC | |
731 | | elfcpp::SHF_WRITE), | |
9446efde | 732 | this->got_, got_order, true); |
ead1e424 | 733 | |
7d9e3d98 | 734 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
82742395 ILT |
735 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
736 | (elfcpp::SHF_ALLOC | |
737 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
738 | this->got_plt_, got_plt_order, |
739 | is_got_plt_relro); | |
a3ad94ed | 740 | |
ead1e424 | 741 | // The first three entries are reserved. |
27bc2bce | 742 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 743 | |
9446efde ILT |
744 | if (!is_got_plt_relro) |
745 | { | |
746 | // Those bytes can go into the relro segment. | |
747 | layout->increase_relro(3 * 4); | |
748 | } | |
1a2dff53 | 749 | |
a3ad94ed | 750 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
751 | this->global_offset_table_ = |
752 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
753 | Symbol_table::PREDEFINED, | |
754 | this->got_plt_, | |
755 | 0, 0, elfcpp::STT_OBJECT, | |
756 | elfcpp::STB_LOCAL, | |
757 | elfcpp::STV_HIDDEN, 0, | |
758 | false, false); | |
a8df5856 | 759 | |
67181c72 ILT |
760 | // If there are any IRELATIVE relocations, they get GOT entries |
761 | // in .got.plt after the jump slot relocations. | |
762 | this->got_irelative_ = new Output_data_space(4, "** GOT IRELATIVE PLT"); | |
763 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
764 | (elfcpp::SHF_ALLOC | |
765 | | elfcpp::SHF_WRITE), | |
766 | this->got_irelative_, | |
9446efde | 767 | got_plt_order, is_got_plt_relro); |
67181c72 | 768 | |
a8df5856 ILT |
769 | // If there are any TLSDESC relocations, they get GOT entries in |
770 | // .got.plt after the jump slot entries. | |
771 | this->got_tlsdesc_ = new Output_data_got<32, false>(); | |
772 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
773 | (elfcpp::SHF_ALLOC | |
774 | | elfcpp::SHF_WRITE), | |
22f0da72 | 775 | this->got_tlsdesc_, |
9446efde | 776 | got_plt_order, is_got_plt_relro); |
ead1e424 | 777 | } |
a3ad94ed | 778 | |
ead1e424 ILT |
779 | return this->got_; |
780 | } | |
781 | ||
5a6f7e2d ILT |
782 | // Get the dynamic reloc section, creating it if necessary. |
783 | ||
784 | Target_i386::Reloc_section* | |
785 | Target_i386::rel_dyn_section(Layout* layout) | |
786 | { | |
787 | if (this->rel_dyn_ == NULL) | |
788 | { | |
789 | gold_assert(layout != NULL); | |
d98bc257 | 790 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 791 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
22f0da72 ILT |
792 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
793 | ORDER_DYNAMIC_RELOCS, false); | |
5a6f7e2d ILT |
794 | } |
795 | return this->rel_dyn_; | |
796 | } | |
797 | ||
67181c72 ILT |
798 | // Get the section to use for IRELATIVE relocs, creating it if |
799 | // necessary. These go in .rel.dyn, but only after all other dynamic | |
800 | // relocations. They need to follow the other dynamic relocations so | |
801 | // that they can refer to global variables initialized by those | |
802 | // relocs. | |
803 | ||
804 | Target_i386::Reloc_section* | |
805 | Target_i386::rel_irelative_section(Layout* layout) | |
806 | { | |
807 | if (this->rel_irelative_ == NULL) | |
808 | { | |
809 | // Make sure we have already create the dynamic reloc section. | |
810 | this->rel_dyn_section(layout); | |
811 | this->rel_irelative_ = new Reloc_section(false); | |
812 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
813 | elfcpp::SHF_ALLOC, this->rel_irelative_, | |
814 | ORDER_DYNAMIC_RELOCS, false); | |
815 | gold_assert(this->rel_dyn_->output_section() | |
816 | == this->rel_irelative_->output_section()); | |
817 | } | |
818 | return this->rel_irelative_; | |
819 | } | |
820 | ||
a3ad94ed ILT |
821 | // Create the PLT section. The ordinary .got section is an argument, |
822 | // since we need to refer to the start. We also create our own .got | |
823 | // section just for PLT entries. | |
824 | ||
67181c72 ILT |
825 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, |
826 | Output_data_space* got_plt, | |
827 | Output_data_space* got_irelative) | |
7d172687 ILT |
828 | : Output_section_data(16), layout_(layout), tls_desc_rel_(NULL), |
829 | irelative_rel_(NULL), got_plt_(got_plt), got_irelative_(got_irelative), | |
830 | count_(0), irelative_count_(0), global_ifuncs_(), local_ifuncs_() | |
a3ad94ed | 831 | { |
d98bc257 | 832 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 833 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
22f0da72 ILT |
834 | elfcpp::SHF_ALLOC, this->rel_, |
835 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca | 836 | |
07a60597 ILT |
837 | // Add unwind information if requested. |
838 | if (parameters->options().ld_generated_unwind_info()) | |
839 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
840 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
a3ad94ed ILT |
841 | } |
842 | ||
16649710 ILT |
843 | void |
844 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
845 | { | |
846 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
847 | // linker, and so do we. | |
848 | os->set_entsize(4); | |
849 | } | |
850 | ||
a3ad94ed ILT |
851 | // Add an entry to the PLT. |
852 | ||
853 | void | |
67181c72 ILT |
854 | Output_data_plt_i386::add_entry(Symbol_table* symtab, Layout* layout, |
855 | Symbol* gsym) | |
a3ad94ed ILT |
856 | { |
857 | gold_assert(!gsym->has_plt_offset()); | |
858 | ||
a3ad94ed | 859 | // Every PLT entry needs a reloc. |
7223e9ca ILT |
860 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
861 | && gsym->can_use_relative_reloc(false)) | |
862 | { | |
67181c72 ILT |
863 | gsym->set_plt_offset(this->irelative_count_ * plt_entry_size); |
864 | ++this->irelative_count_; | |
865 | section_offset_type got_offset = | |
866 | this->got_irelative_->current_data_size(); | |
867 | this->got_irelative_->set_current_data_size(got_offset + 4); | |
868 | Reloc_section* rel = this->rel_irelative(symtab, layout); | |
869 | rel->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE, | |
870 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
871 | struct Global_ifunc gi; |
872 | gi.sym = gsym; | |
873 | gi.got_offset = got_offset; | |
874 | this->global_ifuncs_.push_back(gi); | |
875 | } | |
876 | else | |
877 | { | |
67181c72 ILT |
878 | // When setting the PLT offset we skip the initial reserved PLT |
879 | // entry. | |
880 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
881 | ||
882 | ++this->count_; | |
883 | ||
884 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
885 | ||
886 | // Every PLT entry needs a GOT entry which points back to the | |
887 | // PLT entry (this will be changed by the dynamic linker, | |
888 | // normally lazily when the function is called). | |
889 | this->got_plt_->set_current_data_size(got_offset + 4); | |
890 | ||
7223e9ca ILT |
891 | gsym->set_needs_dynsym_entry(); |
892 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, | |
893 | got_offset); | |
894 | } | |
a3ad94ed ILT |
895 | |
896 | // Note that we don't need to save the symbol. The contents of the | |
897 | // PLT are independent of which symbols are used. The symbols only | |
898 | // appear in the relocations. | |
899 | } | |
900 | ||
7223e9ca ILT |
901 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
902 | // the PLT offset. | |
903 | ||
904 | unsigned int | |
6fa2a40b | 905 | Output_data_plt_i386::add_local_ifunc_entry( |
67181c72 ILT |
906 | Symbol_table* symtab, |
907 | Layout* layout, | |
6fa2a40b CC |
908 | Sized_relobj_file<32, false>* relobj, |
909 | unsigned int local_sym_index) | |
7223e9ca | 910 | { |
67181c72 ILT |
911 | unsigned int plt_offset = this->irelative_count_ * plt_entry_size; |
912 | ++this->irelative_count_; | |
7223e9ca | 913 | |
67181c72 | 914 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
915 | |
916 | // Every PLT entry needs a GOT entry which points back to the PLT | |
917 | // entry. | |
67181c72 | 918 | this->got_irelative_->set_current_data_size(got_offset + 4); |
7223e9ca ILT |
919 | |
920 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
921 | Reloc_section* rel = this->rel_irelative(symtab, layout); |
922 | rel->add_symbolless_local_addend(relobj, local_sym_index, | |
923 | elfcpp::R_386_IRELATIVE, | |
924 | this->got_irelative_, got_offset); | |
7223e9ca ILT |
925 | |
926 | struct Local_ifunc li; | |
927 | li.object = relobj; | |
928 | li.local_sym_index = local_sym_index; | |
929 | li.got_offset = got_offset; | |
930 | this->local_ifuncs_.push_back(li); | |
931 | ||
932 | return plt_offset; | |
933 | } | |
934 | ||
e291e7b9 ILT |
935 | // Return where the TLS_DESC relocations should go, creating it if |
936 | // necessary. These follow the JUMP_SLOT relocations. | |
937 | ||
938 | Output_data_plt_i386::Reloc_section* | |
939 | Output_data_plt_i386::rel_tls_desc(Layout* layout) | |
940 | { | |
941 | if (this->tls_desc_rel_ == NULL) | |
942 | { | |
943 | this->tls_desc_rel_ = new Reloc_section(false); | |
944 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
945 | elfcpp::SHF_ALLOC, this->tls_desc_rel_, | |
22f0da72 | 946 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
947 | gold_assert(this->tls_desc_rel_->output_section() |
948 | == this->rel_->output_section()); | |
e291e7b9 ILT |
949 | } |
950 | return this->tls_desc_rel_; | |
951 | } | |
952 | ||
67181c72 ILT |
953 | // Return where the IRELATIVE relocations should go in the PLT. These |
954 | // follow the JUMP_SLOT and TLS_DESC relocations. | |
955 | ||
956 | Output_data_plt_i386::Reloc_section* | |
957 | Output_data_plt_i386::rel_irelative(Symbol_table* symtab, Layout* layout) | |
958 | { | |
959 | if (this->irelative_rel_ == NULL) | |
960 | { | |
961 | // Make sure we have a place for the TLS_DESC relocations, in | |
962 | // case we see any later on. | |
963 | this->rel_tls_desc(layout); | |
964 | this->irelative_rel_ = new Reloc_section(false); | |
965 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
966 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
967 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
968 | gold_assert(this->irelative_rel_->output_section() | |
969 | == this->rel_->output_section()); | |
970 | ||
971 | if (parameters->doing_static_link()) | |
972 | { | |
973 | // A statically linked executable will only have a .rel.plt | |
974 | // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC | |
975 | // symbols. The library will use these symbols to locate | |
976 | // the IRELATIVE relocs at program startup time. | |
977 | symtab->define_in_output_data("__rel_iplt_start", NULL, | |
978 | Symbol_table::PREDEFINED, | |
979 | this->irelative_rel_, 0, 0, | |
980 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
981 | elfcpp::STV_HIDDEN, 0, false, true); | |
982 | symtab->define_in_output_data("__rel_iplt_end", NULL, | |
983 | Symbol_table::PREDEFINED, | |
984 | this->irelative_rel_, 0, 0, | |
985 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
986 | elfcpp::STV_HIDDEN, 0, true, true); | |
987 | } | |
988 | } | |
989 | return this->irelative_rel_; | |
990 | } | |
991 | ||
992 | // Return the PLT address to use for a global symbol. | |
993 | ||
994 | uint64_t | |
995 | Output_data_plt_i386::address_for_global(const Symbol* gsym) | |
996 | { | |
997 | uint64_t offset = 0; | |
998 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
999 | && gsym->can_use_relative_reloc(false)) | |
1000 | offset = (this->count_ + 1) * plt_entry_size; | |
1001 | return this->address() + offset; | |
1002 | } | |
1003 | ||
1004 | // Return the PLT address to use for a local symbol. These are always | |
1005 | // IRELATIVE relocs. | |
1006 | ||
1007 | uint64_t | |
1008 | Output_data_plt_i386::address_for_local(const Relobj*, unsigned int) | |
1009 | { | |
1010 | return this->address() + (this->count_ + 1) * plt_entry_size; | |
1011 | } | |
1012 | ||
a3ad94ed ILT |
1013 | // The first entry in the PLT for an executable. |
1014 | ||
07a60597 | 1015 | const unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1016 | { |
1017 | 0xff, 0x35, // pushl contents of memory address | |
1018 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
1019 | 0xff, 0x25, // jmp indirect | |
1020 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1021 | 0, 0, 0, 0 // unused | |
1022 | }; | |
1023 | ||
1024 | // The first entry in the PLT for a shared object. | |
1025 | ||
07a60597 | 1026 | const unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1027 | { |
1028 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
1029 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
1030 | 0, 0, 0, 0 // unused | |
1031 | }; | |
1032 | ||
1033 | // Subsequent entries in the PLT for an executable. | |
1034 | ||
07a60597 | 1035 | const unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1036 | { |
1037 | 0xff, 0x25, // jmp indirect | |
1038 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1039 | 0x68, // pushl immediate | |
1040 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1041 | 0xe9, // jmp relative | |
1042 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1043 | }; | |
1044 | ||
1045 | // Subsequent entries in the PLT for a shared object. | |
1046 | ||
07a60597 | 1047 | const unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = |
a3ad94ed ILT |
1048 | { |
1049 | 0xff, 0xa3, // jmp *offset(%ebx) | |
1050 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
1051 | 0x68, // pushl immediate | |
1052 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1053 | 0xe9, // jmp relative | |
1054 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1055 | }; | |
1056 | ||
07a60597 ILT |
1057 | // The .eh_frame unwind information for the PLT. |
1058 | ||
1059 | const unsigned char | |
1060 | Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] = | |
1061 | { | |
1062 | 1, // CIE version. | |
1063 | 'z', // Augmentation: augmentation size included. | |
1064 | 'R', // Augmentation: FDE encoding included. | |
1065 | '\0', // End of augmentation string. | |
1066 | 1, // Code alignment factor. | |
1067 | 0x7c, // Data alignment factor. | |
1068 | 8, // Return address column. | |
1069 | 1, // Augmentation size. | |
1070 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1071 | | elfcpp::DW_EH_PE_sdata4), | |
1072 | elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4. | |
1073 | elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4. | |
1074 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1075 | elfcpp::DW_CFA_nop | |
1076 | }; | |
1077 | ||
1078 | const unsigned char | |
1079 | Output_data_plt_i386::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
1080 | { | |
1081 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1082 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1083 | 0, // Augmentation size. | |
1084 | elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8. | |
1085 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1086 | elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12. | |
1087 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1088 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1089 | 11, // Block length. | |
1090 | elfcpp::DW_OP_breg4, 4, // Push %esp + 4. | |
1091 | elfcpp::DW_OP_breg8, 0, // Push %eip. | |
1092 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1093 | elfcpp::DW_OP_and, // & (%eip & 0xf). | |
1094 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1095 | elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb) | |
1096 | elfcpp::DW_OP_lit2, // Push 2. | |
1097 | elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2) | |
491f21ca | 1098 | elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4 |
07a60597 ILT |
1099 | elfcpp::DW_CFA_nop, // Align to 32 bytes. |
1100 | elfcpp::DW_CFA_nop, | |
1101 | elfcpp::DW_CFA_nop, | |
1102 | elfcpp::DW_CFA_nop | |
1103 | }; | |
1104 | ||
a3ad94ed ILT |
1105 | // Write out the PLT. This uses the hand-coded instructions above, |
1106 | // and adjusts them as needed. This is all specified by the i386 ELF | |
1107 | // Processor Supplement. | |
1108 | ||
1109 | void | |
1110 | Output_data_plt_i386::do_write(Output_file* of) | |
1111 | { | |
2ea97941 | 1112 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1113 | const section_size_type oview_size = |
1114 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1115 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
1116 | |
1117 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1118 | gold_assert(parameters->incremental_update() |
1119 | || (got_file_offset + this->got_plt_->data_size() | |
1120 | == this->got_irelative_->offset())); | |
fe8718a4 | 1121 | const section_size_type got_size = |
67181c72 ILT |
1122 | convert_to_section_size_type(this->got_plt_->data_size() |
1123 | + this->got_irelative_->data_size()); | |
a3ad94ed ILT |
1124 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1125 | got_size); | |
1126 | ||
1127 | unsigned char* pov = oview; | |
1128 | ||
1129 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
1130 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
1131 | ||
374ad285 | 1132 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1133 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
1134 | else | |
1135 | { | |
1136 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
1137 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
1138 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
1139 | } | |
1140 | pov += plt_entry_size; | |
1141 | ||
1142 | unsigned char* got_pov = got_view; | |
1143 | ||
7d172687 ILT |
1144 | // The first entry in the GOT is the address of the .dynamic section |
1145 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1146 | // We saved space for them when we created the section in | |
1147 | // Target_i386::got_section. | |
1148 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1149 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1150 | elfcpp::Swap<32, false>::writeval(got_pov, dynamic_addr); | |
1151 | got_pov += 4; | |
1152 | memset(got_pov, 0, 8); | |
1153 | got_pov += 8; | |
a3ad94ed ILT |
1154 | |
1155 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
1156 | ||
1157 | unsigned int plt_offset = plt_entry_size; | |
1158 | unsigned int plt_rel_offset = 0; | |
1159 | unsigned int got_offset = 12; | |
67181c72 | 1160 | const unsigned int count = this->count_ + this->irelative_count_; |
a3ad94ed ILT |
1161 | for (unsigned int i = 0; |
1162 | i < count; | |
1163 | ++i, | |
1164 | pov += plt_entry_size, | |
1165 | got_pov += 4, | |
1166 | plt_offset += plt_entry_size, | |
1167 | plt_rel_offset += rel_size, | |
1168 | got_offset += 4) | |
1169 | { | |
1170 | // Set and adjust the PLT entry itself. | |
1171 | ||
374ad285 | 1172 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
1173 | { |
1174 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
1175 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
1176 | } | |
1177 | else | |
1178 | { | |
1179 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
1180 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1181 | (got_address | |
1182 | + got_offset)); | |
1183 | } | |
1184 | ||
1185 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
1186 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1187 | - (plt_offset + plt_entry_size)); | |
1188 | ||
1189 | // Set the entry in the GOT. | |
1190 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1191 | } | |
1192 | ||
7223e9ca ILT |
1193 | // If any STT_GNU_IFUNC symbols have PLT entries, we need to change |
1194 | // the GOT to point to the actual symbol value, rather than point to | |
1195 | // the PLT entry. That will let the dynamic linker call the right | |
1196 | // function when resolving IRELATIVE relocations. | |
67181c72 | 1197 | unsigned char* got_irelative_view = got_view + this->got_plt_->data_size(); |
7223e9ca ILT |
1198 | for (std::vector<Global_ifunc>::const_iterator p = |
1199 | this->global_ifuncs_.begin(); | |
1200 | p != this->global_ifuncs_.end(); | |
1201 | ++p) | |
1202 | { | |
1203 | const Sized_symbol<32>* ssym = | |
1204 | static_cast<const Sized_symbol<32>*>(p->sym); | |
67181c72 | 1205 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1206 | ssym->value()); |
1207 | } | |
1208 | ||
1209 | for (std::vector<Local_ifunc>::const_iterator p = | |
1210 | this->local_ifuncs_.begin(); | |
1211 | p != this->local_ifuncs_.end(); | |
1212 | ++p) | |
1213 | { | |
1214 | const Symbol_value<32>* psymval = | |
1215 | p->object->local_symbol(p->local_sym_index); | |
67181c72 | 1216 | elfcpp::Swap<32, false>::writeval(got_irelative_view + p->got_offset, |
7223e9ca ILT |
1217 | psymval->value(p->object, 0)); |
1218 | } | |
1219 | ||
fe8718a4 ILT |
1220 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1221 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 1222 | |
2ea97941 | 1223 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
1224 | of->write_output_view(got_file_offset, got_size, got_view); |
1225 | } | |
1226 | ||
7223e9ca | 1227 | // Create the PLT section. |
a3ad94ed ILT |
1228 | |
1229 | void | |
7223e9ca | 1230 | Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout) |
a3ad94ed | 1231 | { |
a3ad94ed ILT |
1232 | if (this->plt_ == NULL) |
1233 | { | |
1234 | // Create the GOT sections first. | |
7e1edb90 | 1235 | this->got_section(symtab, layout); |
a3ad94ed | 1236 | |
67181c72 ILT |
1237 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_, |
1238 | this->got_irelative_); | |
16649710 ILT |
1239 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1240 | (elfcpp::SHF_ALLOC | |
1241 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1242 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1243 | |
1244 | // Make the sh_info field of .rel.plt point to .plt. | |
1245 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); | |
1246 | rel_plt_os->set_info_section(this->plt_->output_section()); | |
a3ad94ed | 1247 | } |
7223e9ca | 1248 | } |
a3ad94ed | 1249 | |
7223e9ca ILT |
1250 | // Create a PLT entry for a global symbol. |
1251 | ||
1252 | void | |
1253 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) | |
1254 | { | |
1255 | if (gsym->has_plt_offset()) | |
1256 | return; | |
1257 | if (this->plt_ == NULL) | |
1258 | this->make_plt_section(symtab, layout); | |
67181c72 | 1259 | this->plt_->add_entry(symtab, layout, gsym); |
a3ad94ed ILT |
1260 | } |
1261 | ||
7223e9ca ILT |
1262 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1263 | ||
1264 | void | |
1265 | Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1266 | Sized_relobj_file<32, false>* relobj, |
7223e9ca ILT |
1267 | unsigned int local_sym_index) |
1268 | { | |
1269 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1270 | return; | |
1271 | if (this->plt_ == NULL) | |
1272 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1273 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1274 | relobj, | |
7223e9ca ILT |
1275 | local_sym_index); |
1276 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1277 | } | |
1278 | ||
0e70b911 CC |
1279 | // Return the number of entries in the PLT. |
1280 | ||
1281 | unsigned int | |
1282 | Target_i386::plt_entry_count() const | |
1283 | { | |
1284 | if (this->plt_ == NULL) | |
1285 | return 0; | |
1286 | return this->plt_->entry_count(); | |
1287 | } | |
1288 | ||
1289 | // Return the offset of the first non-reserved PLT entry. | |
1290 | ||
1291 | unsigned int | |
1292 | Target_i386::first_plt_entry_offset() const | |
1293 | { | |
1294 | return Output_data_plt_i386::first_plt_entry_offset(); | |
1295 | } | |
1296 | ||
1297 | // Return the size of each PLT entry. | |
1298 | ||
1299 | unsigned int | |
1300 | Target_i386::plt_entry_size() const | |
1301 | { | |
1302 | return Output_data_plt_i386::get_plt_entry_size(); | |
1303 | } | |
1304 | ||
e291e7b9 ILT |
1305 | // Get the section to use for TLS_DESC relocations. |
1306 | ||
1307 | Target_i386::Reloc_section* | |
1308 | Target_i386::rel_tls_desc_section(Layout* layout) const | |
1309 | { | |
1310 | return this->plt_section()->rel_tls_desc(layout); | |
1311 | } | |
1312 | ||
9fa33bee | 1313 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1314 | |
1315 | void | |
1316 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1317 | { | |
1318 | if (this->tls_base_symbol_defined_) | |
1319 | return; | |
1320 | ||
1321 | Output_segment* tls_segment = layout->tls_segment(); | |
1322 | if (tls_segment != NULL) | |
1323 | { | |
183fd0e3 | 1324 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1325 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1326 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1327 | tls_segment, 0, 0, |
1328 | elfcpp::STT_TLS, | |
1329 | elfcpp::STB_LOCAL, | |
1330 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1331 | (is_exec |
1332 | ? Symbol::SEGMENT_END | |
1333 | : Symbol::SEGMENT_START), | |
1334 | true); | |
edfbb029 CC |
1335 | } |
1336 | this->tls_base_symbol_defined_ = true; | |
1337 | } | |
1338 | ||
94c4710f ILT |
1339 | // Create a GOT entry for the TLS module index. |
1340 | ||
1341 | unsigned int | |
1342 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
6fa2a40b | 1343 | Sized_relobj_file<32, false>* object) |
94c4710f ILT |
1344 | { |
1345 | if (this->got_mod_index_offset_ == -1U) | |
1346 | { | |
1347 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1348 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
1349 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
1350 | unsigned int got_offset = got->add_constant(0); | |
1351 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
1352 | got_offset); | |
009a67a2 | 1353 | got->add_constant(0); |
94c4710f ILT |
1354 | this->got_mod_index_offset_ = got_offset; |
1355 | } | |
1356 | return this->got_mod_index_offset_; | |
1357 | } | |
1358 | ||
92e059d8 | 1359 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
1360 | // symbol. IS_FINAL is true if the final address of this symbol is |
1361 | // known at link time. | |
92e059d8 | 1362 | |
af6359d5 | 1363 | tls::Tls_optimization |
7e1edb90 | 1364 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
1365 | { |
1366 | // If we are generating a shared library, then we can't do anything | |
1367 | // in the linker. | |
8851ecca | 1368 | if (parameters->options().shared()) |
af6359d5 | 1369 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1370 | |
1371 | switch (r_type) | |
1372 | { | |
1373 | case elfcpp::R_386_TLS_GD: | |
1374 | case elfcpp::R_386_TLS_GOTDESC: | |
1375 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 1376 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
1377 | // access. Since we know that we are generating an executable, |
1378 | // we can convert this to Initial-Exec. If we also know that | |
1379 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 1380 | if (is_final) |
af6359d5 ILT |
1381 | return tls::TLSOPT_TO_LE; |
1382 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
1383 | |
1384 | case elfcpp::R_386_TLS_LDM: | |
1385 | // This is Local-Dynamic, which refers to a local symbol in the | |
1386 | // dynamic TLS block. Since we know that we generating an | |
1387 | // executable, we can switch to Local-Exec. | |
af6359d5 | 1388 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
1389 | |
1390 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
1391 | // Another type of Local-Dynamic relocation. |
1392 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
1393 | |
1394 | case elfcpp::R_386_TLS_IE: | |
1395 | case elfcpp::R_386_TLS_GOTIE: | |
1396 | case elfcpp::R_386_TLS_IE_32: | |
1397 | // These are Initial-Exec relocs which get the thread offset | |
1398 | // from the GOT. If we know that we are linking against the | |
1399 | // local symbol, we can switch to Local-Exec, which links the | |
1400 | // thread offset into the instruction. | |
a3ad94ed | 1401 | if (is_final) |
af6359d5 ILT |
1402 | return tls::TLSOPT_TO_LE; |
1403 | return tls::TLSOPT_NONE; | |
8462ae85 | 1404 | |
92e059d8 ILT |
1405 | case elfcpp::R_386_TLS_LE: |
1406 | case elfcpp::R_386_TLS_LE_32: | |
1407 | // When we already have Local-Exec, there is nothing further we | |
1408 | // can do. | |
af6359d5 | 1409 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
1410 | |
1411 | default: | |
a3ad94ed | 1412 | gold_unreachable(); |
92e059d8 ILT |
1413 | } |
1414 | } | |
1415 | ||
95a2c8d6 | 1416 | // Get the Reference_flags for a particular relocation. |
af6359d5 | 1417 | |
95a2c8d6 RS |
1418 | int |
1419 | Target_i386::Scan::get_reference_flags(unsigned int r_type) | |
7223e9ca ILT |
1420 | { |
1421 | switch (r_type) | |
1422 | { | |
1423 | case elfcpp::R_386_NONE: | |
1424 | case elfcpp::R_386_GNU_VTINHERIT: | |
1425 | case elfcpp::R_386_GNU_VTENTRY: | |
95a2c8d6 RS |
1426 | case elfcpp::R_386_GOTPC: |
1427 | // No symbol reference. | |
1428 | return 0; | |
7223e9ca ILT |
1429 | |
1430 | case elfcpp::R_386_32: | |
1431 | case elfcpp::R_386_16: | |
1432 | case elfcpp::R_386_8: | |
95a2c8d6 RS |
1433 | return Symbol::ABSOLUTE_REF; |
1434 | ||
7223e9ca ILT |
1435 | case elfcpp::R_386_PC32: |
1436 | case elfcpp::R_386_PC16: | |
1437 | case elfcpp::R_386_PC8: | |
7223e9ca | 1438 | case elfcpp::R_386_GOTOFF: |
95a2c8d6 RS |
1439 | return Symbol::RELATIVE_REF; |
1440 | ||
1441 | case elfcpp::R_386_PLT32: | |
1442 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1443 | ||
7223e9ca | 1444 | case elfcpp::R_386_GOT32: |
95a2c8d6 RS |
1445 | // Absolute in GOT. |
1446 | return Symbol::ABSOLUTE_REF; | |
1447 | ||
1448 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
1449 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1450 | case elfcpp::R_386_TLS_DESC_CALL: | |
1451 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1452 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1453 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
1454 | case elfcpp::R_386_TLS_IE_32: | |
1455 | case elfcpp::R_386_TLS_GOTIE: | |
1456 | case elfcpp::R_386_TLS_LE: // Local-exec | |
1457 | case elfcpp::R_386_TLS_LE_32: | |
1458 | return Symbol::TLS_REF; | |
7223e9ca ILT |
1459 | |
1460 | case elfcpp::R_386_COPY: | |
1461 | case elfcpp::R_386_GLOB_DAT: | |
1462 | case elfcpp::R_386_JUMP_SLOT: | |
1463 | case elfcpp::R_386_RELATIVE: | |
1464 | case elfcpp::R_386_IRELATIVE: | |
1465 | case elfcpp::R_386_TLS_TPOFF: | |
1466 | case elfcpp::R_386_TLS_DTPMOD32: | |
1467 | case elfcpp::R_386_TLS_DTPOFF32: | |
1468 | case elfcpp::R_386_TLS_TPOFF32: | |
1469 | case elfcpp::R_386_TLS_DESC: | |
7223e9ca ILT |
1470 | case elfcpp::R_386_32PLT: |
1471 | case elfcpp::R_386_TLS_GD_32: | |
1472 | case elfcpp::R_386_TLS_GD_PUSH: | |
1473 | case elfcpp::R_386_TLS_GD_CALL: | |
1474 | case elfcpp::R_386_TLS_GD_POP: | |
1475 | case elfcpp::R_386_TLS_LDM_32: | |
1476 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1477 | case elfcpp::R_386_TLS_LDM_CALL: | |
1478 | case elfcpp::R_386_TLS_LDM_POP: | |
1479 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1480 | default: | |
95a2c8d6 RS |
1481 | // Not expected. We will give an error later. |
1482 | return 0; | |
7223e9ca ILT |
1483 | } |
1484 | } | |
1485 | ||
95a2c8d6 RS |
1486 | // Report an unsupported relocation against a local symbol. |
1487 | ||
1488 | void | |
6fa2a40b | 1489 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object, |
95a2c8d6 RS |
1490 | unsigned int r_type) |
1491 | { | |
1492 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1493 | object->name().c_str(), r_type); | |
1494 | } | |
1495 | ||
1496 | // Return whether we need to make a PLT entry for a relocation of a | |
1497 | // given type against a STT_GNU_IFUNC symbol. | |
1498 | ||
1499 | bool | |
6fa2a40b CC |
1500 | Target_i386::Scan::reloc_needs_plt_for_ifunc( |
1501 | Sized_relobj_file<32, false>* object, | |
1502 | unsigned int r_type) | |
95a2c8d6 RS |
1503 | { |
1504 | int flags = Scan::get_reference_flags(r_type); | |
1505 | if (flags & Symbol::TLS_REF) | |
1506 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1507 | object->name().c_str(), r_type); | |
1508 | return flags != 0; | |
1509 | } | |
1510 | ||
92e059d8 ILT |
1511 | // Scan a relocation for a local symbol. |
1512 | ||
1513 | inline void | |
ad0f2072 | 1514 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
1515 | Layout* layout, |
1516 | Target_i386* target, | |
6fa2a40b | 1517 | Sized_relobj_file<32, false>* object, |
1b64748b | 1518 | unsigned int data_shndx, |
07f397ab | 1519 | Output_section* output_section, |
1b64748b | 1520 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 1521 | unsigned int r_type, |
7bf1f802 | 1522 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 | 1523 | { |
7223e9ca ILT |
1524 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1525 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1526 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1527 | { | |
1528 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1529 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1530 | } | |
1531 | ||
92e059d8 ILT |
1532 | switch (r_type) |
1533 | { | |
1534 | case elfcpp::R_386_NONE: | |
1535 | case elfcpp::R_386_GNU_VTINHERIT: | |
1536 | case elfcpp::R_386_GNU_VTENTRY: | |
1537 | break; | |
1538 | ||
1539 | case elfcpp::R_386_32: | |
436ca963 ILT |
1540 | // If building a shared library (or a position-independent |
1541 | // executable), we need to create a dynamic relocation for | |
1542 | // this location. The relocation applied at link time will | |
1543 | // apply the link-time value, so we flag the location with | |
1544 | // an R_386_RELATIVE relocation so the dynamic loader can | |
1545 | // relocate it easily. | |
8851ecca | 1546 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
1547 | { |
1548 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 1549 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
7223e9ca ILT |
1550 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, |
1551 | output_section, data_shndx, | |
1552 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
1553 | } |
1554 | break; | |
1555 | ||
1556 | case elfcpp::R_386_16: | |
1557 | case elfcpp::R_386_8: | |
1558 | // If building a shared library (or a position-independent | |
1559 | // executable), we need to create a dynamic relocation for | |
1560 | // this location. Because the addend needs to remain in the | |
1561 | // data section, we need to be careful not to apply this | |
1562 | // relocation statically. | |
8851ecca | 1563 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
1564 | { |
1565 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 1566 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 1567 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1568 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
1569 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
1570 | else |
1571 | { | |
1572 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1573 | unsigned int shndx = lsym.get_st_shndx(); |
1574 | bool is_ordinary; | |
1575 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1576 | &is_ordinary); | |
1577 | if (!is_ordinary) | |
1578 | object->error(_("section symbol %u has bad shndx %u"), | |
1579 | r_sym, shndx); | |
1580 | else | |
1581 | rel_dyn->add_local_section(object, shndx, | |
1582 | r_type, output_section, | |
1583 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 1584 | } |
436ca963 | 1585 | } |
92e059d8 ILT |
1586 | break; |
1587 | ||
1588 | case elfcpp::R_386_PC32: | |
1589 | case elfcpp::R_386_PC16: | |
1590 | case elfcpp::R_386_PC8: | |
1591 | break; | |
1592 | ||
df2efe71 ILT |
1593 | case elfcpp::R_386_PLT32: |
1594 | // Since we know this is a local symbol, we can handle this as a | |
1595 | // PC32 reloc. | |
1596 | break; | |
1597 | ||
ead1e424 ILT |
1598 | case elfcpp::R_386_GOTOFF: |
1599 | case elfcpp::R_386_GOTPC: | |
1600 | // We need a GOT section. | |
7e1edb90 | 1601 | target->got_section(symtab, layout); |
ead1e424 ILT |
1602 | break; |
1603 | ||
1b64748b ILT |
1604 | case elfcpp::R_386_GOT32: |
1605 | { | |
1606 | // The symbol requires a GOT entry. | |
1607 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
1608 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7223e9ca ILT |
1609 | |
1610 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1611 | // lets function pointers compare correctly with shared | |
1612 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1613 | bool is_new; | |
1614 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1615 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1616 | else | |
1617 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1618 | if (is_new) | |
1b64748b ILT |
1619 | { |
1620 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1621 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 1622 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
1623 | { |
1624 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1625 | unsigned int got_offset = |
1626 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1627 | rel_dyn->add_local_relative(object, r_sym, | |
1628 | elfcpp::R_386_RELATIVE, | |
1629 | got, got_offset); | |
1b64748b ILT |
1630 | } |
1631 | } | |
1632 | } | |
1633 | break; | |
1634 | ||
af6359d5 ILT |
1635 | // These are relocations which should only be seen by the |
1636 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1637 | case elfcpp::R_386_COPY: |
1638 | case elfcpp::R_386_GLOB_DAT: | |
1639 | case elfcpp::R_386_JUMP_SLOT: | |
1640 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 1641 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
1642 | case elfcpp::R_386_TLS_TPOFF: |
1643 | case elfcpp::R_386_TLS_DTPMOD32: | |
1644 | case elfcpp::R_386_TLS_DTPOFF32: | |
1645 | case elfcpp::R_386_TLS_TPOFF32: | |
1646 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1647 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1648 | object->name().c_str(), r_type); |
92e059d8 ILT |
1649 | break; |
1650 | ||
af6359d5 | 1651 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1652 | // linking. |
56622147 ILT |
1653 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1654 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1655 | case elfcpp::R_386_TLS_DESC_CALL: | |
1656 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1657 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1658 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1659 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1660 | case elfcpp::R_386_TLS_GOTIE: |
1661 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1662 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1663 | { |
8851ecca | 1664 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1665 | const tls::Tls_optimization optimized_type |
1666 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1667 | switch (r_type) |
1668 | { | |
56622147 | 1669 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1670 | if (optimized_type == tls::TLSOPT_NONE) |
1671 | { | |
1672 | // Create a pair of GOT entries for the module index and | |
1673 | // dtv-relative offset. | |
1674 | Output_data_got<32, false>* got | |
1675 | = target->got_section(symtab, layout); | |
1676 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1677 | unsigned int shndx = lsym.get_st_shndx(); |
1678 | bool is_ordinary; | |
1679 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1680 | if (!is_ordinary) | |
1681 | object->error(_("local symbol %u has bad shndx %u"), | |
1682 | r_sym, shndx); | |
1683 | else | |
1684 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1685 | GOT_TYPE_TLS_PAIR, | |
1686 | target->rel_dyn_section(layout), | |
1687 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1688 | } |
1689 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1690 | unsupported_reloc_local(object, r_type); | |
1691 | break; | |
1692 | ||
56622147 | 1693 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1694 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1695 | if (optimized_type == tls::TLSOPT_NONE) |
1696 | { | |
a8df5856 ILT |
1697 | // Create a double GOT entry with an R_386_TLS_DESC |
1698 | // reloc. The R_386_TLS_DESC reloc is resolved | |
1699 | // lazily, so the GOT entry needs to be in an area in | |
1700 | // .got.plt, not .got. Call got_section to make sure | |
1701 | // the section has been created. | |
1702 | target->got_section(symtab, layout); | |
1703 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1704 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
e291e7b9 ILT |
1705 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1706 | { | |
1707 | unsigned int got_offset = got->add_constant(0); | |
1708 | // The local symbol value is stored in the second | |
1709 | // GOT entry. | |
1710 | got->add_local(object, r_sym, GOT_TYPE_TLS_DESC); | |
1711 | // That set the GOT offset of the local symbol to | |
1712 | // point to the second entry, but we want it to | |
1713 | // point to the first. | |
1714 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1715 | got_offset); | |
1716 | Reloc_section* rt = target->rel_tls_desc_section(layout); | |
1717 | rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset); | |
1718 | } | |
c2b45e22 CC |
1719 | } |
1720 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1721 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1722 | break; |
1723 | ||
c2b45e22 CC |
1724 | case elfcpp::R_386_TLS_DESC_CALL: |
1725 | break; | |
1726 | ||
56622147 | 1727 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1728 | if (optimized_type == tls::TLSOPT_NONE) |
1729 | { | |
1730 | // Create a GOT entry for the module index. | |
94c4710f | 1731 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1732 | } |
1733 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1734 | unsupported_reloc_local(object, r_type); |
1735 | break; | |
1736 | ||
56622147 | 1737 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1738 | break; |
1739 | ||
56622147 ILT |
1740 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1741 | case elfcpp::R_386_TLS_IE_32: | |
1742 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1743 | layout->set_has_static_tls(); |
07f397ab ILT |
1744 | if (optimized_type == tls::TLSOPT_NONE) |
1745 | { | |
7bf1f802 ILT |
1746 | // For the R_386_TLS_IE relocation, we need to create a |
1747 | // dynamic relocation when building a shared library. | |
1748 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1749 | && parameters->options().shared()) |
7bf1f802 ILT |
1750 | { |
1751 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1752 | unsigned int r_sym |
1753 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1754 | rel_dyn->add_local_relative(object, r_sym, | |
1755 | elfcpp::R_386_RELATIVE, | |
1756 | output_section, data_shndx, | |
1757 | reloc.get_r_offset()); | |
7bf1f802 | 1758 | } |
07f397ab ILT |
1759 | // Create a GOT entry for the tp-relative offset. |
1760 | Output_data_got<32, false>* got | |
1761 | = target->got_section(symtab, layout); | |
1762 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1763 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1764 | ? elfcpp::R_386_TLS_TPOFF32 | |
1765 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1766 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1767 | ? GOT_TYPE_TLS_OFFSET | |
1768 | : GOT_TYPE_TLS_NOFFSET); | |
1769 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1770 | target->rel_dyn_section(layout), |
1771 | dyn_r_type); | |
07f397ab ILT |
1772 | } |
1773 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1774 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1775 | break; |
af6359d5 | 1776 | |
56622147 ILT |
1777 | case elfcpp::R_386_TLS_LE: // Local-exec |
1778 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1779 | layout->set_has_static_tls(); |
07f397ab | 1780 | if (output_is_shared) |
7bf1f802 ILT |
1781 | { |
1782 | // We need to create a dynamic relocation. | |
dceae3c1 | 1783 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1784 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1785 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1786 | ? elfcpp::R_386_TLS_TPOFF32 | |
1787 | : elfcpp::R_386_TLS_TPOFF); | |
1788 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1789 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1790 | data_shndx, reloc.get_r_offset()); | |
1791 | } | |
56622147 ILT |
1792 | break; |
1793 | ||
af6359d5 ILT |
1794 | default: |
1795 | gold_unreachable(); | |
7e1edb90 ILT |
1796 | } |
1797 | } | |
92e059d8 ILT |
1798 | break; |
1799 | ||
92e059d8 ILT |
1800 | case elfcpp::R_386_32PLT: |
1801 | case elfcpp::R_386_TLS_GD_32: | |
1802 | case elfcpp::R_386_TLS_GD_PUSH: | |
1803 | case elfcpp::R_386_TLS_GD_CALL: | |
1804 | case elfcpp::R_386_TLS_GD_POP: | |
1805 | case elfcpp::R_386_TLS_LDM_32: | |
1806 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1807 | case elfcpp::R_386_TLS_LDM_CALL: | |
1808 | case elfcpp::R_386_TLS_LDM_POP: | |
1809 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1810 | default: | |
af6359d5 | 1811 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1812 | break; |
1813 | } | |
1814 | } | |
1815 | ||
af6359d5 ILT |
1816 | // Report an unsupported relocation against a global symbol. |
1817 | ||
1818 | void | |
6fa2a40b CC |
1819 | Target_i386::Scan::unsupported_reloc_global( |
1820 | Sized_relobj_file<32, false>* object, | |
1821 | unsigned int r_type, | |
1822 | Symbol* gsym) | |
af6359d5 | 1823 | { |
75f2446e | 1824 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1825 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1826 | } |
1827 | ||
0897ed3b ST |
1828 | inline bool |
1829 | Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1830 | { | |
1831 | switch (r_type) | |
1832 | { | |
1833 | case elfcpp::R_386_32: | |
1834 | case elfcpp::R_386_16: | |
1835 | case elfcpp::R_386_8: | |
1836 | case elfcpp::R_386_GOTOFF: | |
1837 | case elfcpp::R_386_GOT32: | |
1838 | { | |
1839 | return true; | |
1840 | } | |
1841 | default: | |
1842 | return false; | |
1843 | } | |
1844 | return false; | |
1845 | } | |
1846 | ||
1847 | inline bool | |
1848 | Target_i386::Scan::local_reloc_may_be_function_pointer( | |
1849 | Symbol_table* , | |
1850 | Layout* , | |
1851 | Target_i386* , | |
6fa2a40b | 1852 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1853 | unsigned int , |
1854 | Output_section* , | |
1855 | const elfcpp::Rel<32, false>& , | |
1856 | unsigned int r_type, | |
1857 | const elfcpp::Sym<32, false>&) | |
1858 | { | |
1859 | return possible_function_pointer_reloc(r_type); | |
1860 | } | |
1861 | ||
1862 | inline bool | |
1863 | Target_i386::Scan::global_reloc_may_be_function_pointer( | |
1864 | Symbol_table* , | |
1865 | Layout* , | |
1866 | Target_i386* , | |
6fa2a40b | 1867 | Sized_relobj_file<32, false>* , |
0897ed3b ST |
1868 | unsigned int , |
1869 | Output_section* , | |
1870 | const elfcpp::Rel<32, false>& , | |
1871 | unsigned int r_type, | |
1872 | Symbol*) | |
1873 | { | |
1874 | return possible_function_pointer_reloc(r_type); | |
1875 | } | |
1876 | ||
92e059d8 ILT |
1877 | // Scan a relocation for a global symbol. |
1878 | ||
1879 | inline void | |
ad0f2072 | 1880 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1881 | Layout* layout, |
1882 | Target_i386* target, | |
6fa2a40b | 1883 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 1884 | unsigned int data_shndx, |
07f397ab | 1885 | Output_section* output_section, |
a3ad94ed ILT |
1886 | const elfcpp::Rel<32, false>& reloc, |
1887 | unsigned int r_type, | |
92e059d8 ILT |
1888 | Symbol* gsym) |
1889 | { | |
7223e9ca ILT |
1890 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1891 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1892 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1893 | target->make_plt_entry(symtab, layout, gsym); | |
1894 | ||
92e059d8 ILT |
1895 | switch (r_type) |
1896 | { | |
1897 | case elfcpp::R_386_NONE: | |
1898 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1899 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1900 | break; |
1901 | ||
1902 | case elfcpp::R_386_32: | |
92e059d8 | 1903 | case elfcpp::R_386_16: |
92e059d8 | 1904 | case elfcpp::R_386_8: |
96f2030e | 1905 | { |
d61c6bd4 ILT |
1906 | // Make a PLT entry if necessary. |
1907 | if (gsym->needs_plt_entry()) | |
1908 | { | |
1909 | target->make_plt_entry(symtab, layout, gsym); | |
1910 | // Since this is not a PC-relative relocation, we may be | |
1911 | // taking the address of a function. In that case we need to | |
1912 | // set the entry in the dynamic symbol table to the address of | |
1913 | // the PLT entry. | |
8851ecca | 1914 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1915 | gsym->set_needs_dynsym_value(); |
1916 | } | |
1917 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1918 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1919 | { |
966d4097 | 1920 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1921 | { |
12c0daef | 1922 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1923 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1924 | } |
7223e9ca ILT |
1925 | else if (r_type == elfcpp::R_386_32 |
1926 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1927 | && gsym->can_use_relative_reloc(false) | |
1928 | && !gsym->is_from_dynobj() | |
1929 | && !gsym->is_undefined() | |
1930 | && !gsym->is_preemptible()) | |
1931 | { | |
1932 | // Use an IRELATIVE reloc for a locally defined | |
1933 | // STT_GNU_IFUNC symbol. This makes a function | |
1934 | // address in a PIE executable match the address in a | |
1935 | // shared library that it links against. | |
67181c72 | 1936 | Reloc_section* rel_dyn = target->rel_irelative_section(layout); |
7223e9ca ILT |
1937 | rel_dyn->add_symbolless_global_addend(gsym, |
1938 | elfcpp::R_386_IRELATIVE, | |
1939 | output_section, | |
1940 | object, data_shndx, | |
1941 | reloc.get_r_offset()); | |
1942 | } | |
d61c6bd4 ILT |
1943 | else if (r_type == elfcpp::R_386_32 |
1944 | && gsym->can_use_relative_reloc(false)) | |
1945 | { | |
1946 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
7223e9ca ILT |
1947 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1948 | output_section, object, | |
1949 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1950 | } |
1951 | else | |
1952 | { | |
96f2030e | 1953 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1954 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1955 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1956 | } |
1957 | } | |
1958 | } | |
1959 | break; | |
1960 | ||
1961 | case elfcpp::R_386_PC32: | |
1962 | case elfcpp::R_386_PC16: | |
1963 | case elfcpp::R_386_PC8: | |
1964 | { | |
1965 | // Make a PLT entry if necessary. | |
1966 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1967 | { |
1968 | // These relocations are used for function calls only in | |
1969 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1970 | // we'll need a text relocation anyway, so we can skip the | |
1971 | // PLT entry and let the dynamic linker bind the call directly | |
1972 | // to the target. For smaller relocations, we should use a | |
1973 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1974 | if (!parameters->options().shared() |
7bf1f802 ILT |
1975 | || r_type != elfcpp::R_386_PC32) |
1976 | target->make_plt_entry(symtab, layout, gsym); | |
1977 | } | |
d61c6bd4 | 1978 | // Make a dynamic relocation if necessary. |
95a2c8d6 | 1979 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
96f2030e | 1980 | { |
966d4097 | 1981 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1982 | { |
12c0daef | 1983 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1984 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1985 | } |
86849f1f | 1986 | else |
d61c6bd4 ILT |
1987 | { |
1988 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1989 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1990 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1991 | } |
96f2030e ILT |
1992 | } |
1993 | } | |
92e059d8 ILT |
1994 | break; |
1995 | ||
ead1e424 | 1996 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1997 | { |
1998 | // The symbol requires a GOT entry. | |
7e1edb90 | 1999 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 2000 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2001 | { |
2002 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2003 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2004 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2005 | else | |
2006 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2007 | } | |
7bf1f802 ILT |
2008 | else |
2009 | { | |
8462ae85 | 2010 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
2011 | // GOT entry with a dynamic relocation. |
2012 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
07aa62f2 ILT |
2013 | |
2014 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2015 | // | |
2016 | // 1) The symbol may be defined in some other module. | |
2017 | // | |
2018 | // 2) We are building a shared library and this is a | |
2019 | // protected symbol; using GLOB_DAT means that the dynamic | |
2020 | // linker can use the address of the PLT in the main | |
2021 | // executable when appropriate so that function address | |
2022 | // comparisons work. | |
2023 | // | |
2024 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2025 | // code, again so that function address comparisons work. | |
8fc19601 ILT |
2026 | if (gsym->is_from_dynobj() |
2027 | || gsym->is_undefined() | |
7223e9ca | 2028 | || gsym->is_preemptible() |
07aa62f2 ILT |
2029 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2030 | && parameters->options().shared()) | |
7223e9ca ILT |
2031 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2032 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 CC |
2033 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
2034 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 2035 | else |
8462ae85 | 2036 | { |
7223e9ca ILT |
2037 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2038 | // offset into the GOT, so that function pointer | |
2039 | // comparisons work correctly. | |
2040 | bool is_new; | |
2041 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2042 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2043 | else | |
2044 | { | |
2045 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2046 | // Tell the dynamic linker to use the PLT address | |
2047 | // when resolving relocations. | |
2048 | if (gsym->is_from_dynobj() | |
2049 | && !parameters->options().shared()) | |
2050 | gsym->set_needs_dynsym_value(); | |
2051 | } | |
2052 | if (is_new) | |
2053 | { | |
2054 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2055 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, | |
2056 | got, got_off); | |
2057 | } | |
8462ae85 ILT |
2058 | } |
2059 | } | |
2060 | } | |
ead1e424 ILT |
2061 | break; |
2062 | ||
2063 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
2064 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2065 | // Otherwise we need a PLT entry. | |
7e1edb90 | 2066 | if (gsym->final_value_is_known()) |
ead1e424 | 2067 | break; |
436ca963 ILT |
2068 | // If building a shared library, we can also skip the PLT entry |
2069 | // if the symbol is defined in the output file and is protected | |
2070 | // or hidden. | |
2071 | if (gsym->is_defined() | |
2072 | && !gsym->is_from_dynobj() | |
2073 | && !gsym->is_preemptible()) | |
2074 | break; | |
7e1edb90 | 2075 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
2076 | break; |
2077 | ||
2078 | case elfcpp::R_386_GOTOFF: | |
2079 | case elfcpp::R_386_GOTPC: | |
2080 | // We need a GOT section. | |
7e1edb90 | 2081 | target->got_section(symtab, layout); |
ead1e424 ILT |
2082 | break; |
2083 | ||
af6359d5 ILT |
2084 | // These are relocations which should only be seen by the |
2085 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
2086 | case elfcpp::R_386_COPY: |
2087 | case elfcpp::R_386_GLOB_DAT: | |
2088 | case elfcpp::R_386_JUMP_SLOT: | |
2089 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2090 | case elfcpp::R_386_IRELATIVE: |
92e059d8 ILT |
2091 | case elfcpp::R_386_TLS_TPOFF: |
2092 | case elfcpp::R_386_TLS_DTPMOD32: | |
2093 | case elfcpp::R_386_TLS_DTPOFF32: | |
2094 | case elfcpp::R_386_TLS_TPOFF32: | |
2095 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2096 | gold_error(_("%s: unexpected reloc %u in object file"), |
2097 | object->name().c_str(), r_type); | |
92e059d8 ILT |
2098 | break; |
2099 | ||
d61c17ea ILT |
2100 | // These are initial tls relocs, which are expected when |
2101 | // linking. | |
56622147 ILT |
2102 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2103 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2104 | case elfcpp::R_386_TLS_DESC_CALL: | |
2105 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2106 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2107 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2108 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2109 | case elfcpp::R_386_TLS_GOTIE: |
2110 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2111 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 2112 | { |
7e1edb90 | 2113 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
2114 | const tls::Tls_optimization optimized_type |
2115 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
2116 | switch (r_type) |
2117 | { | |
56622147 | 2118 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
2119 | if (optimized_type == tls::TLSOPT_NONE) |
2120 | { | |
2121 | // Create a pair of GOT entries for the module index and | |
2122 | // dtv-relative offset. | |
2123 | Output_data_got<32, false>* got | |
2124 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2125 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
2126 | target->rel_dyn_section(layout), |
2127 | elfcpp::R_386_TLS_DTPMOD32, | |
2128 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
2129 | } |
2130 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2131 | { | |
2132 | // Create a GOT entry for the tp-relative offset. | |
2133 | Output_data_got<32, false>* got | |
2134 | = target->got_section(symtab, layout); | |
c2b45e22 | 2135 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 2136 | target->rel_dyn_section(layout), |
c2b45e22 | 2137 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
2138 | } |
2139 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2140 | unsupported_reloc_global(object, r_type, gsym); | |
2141 | break; | |
2142 | ||
56622147 | 2143 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 2144 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2145 | if (optimized_type == tls::TLSOPT_NONE) |
2146 | { | |
a8df5856 ILT |
2147 | // Create a double GOT entry with an R_386_TLS_DESC |
2148 | // reloc. The R_386_TLS_DESC reloc is resolved | |
2149 | // lazily, so the GOT entry needs to be in an area in | |
2150 | // .got.plt, not .got. Call got_section to make sure | |
2151 | // the section has been created. | |
2152 | target->got_section(symtab, layout); | |
2153 | Output_data_got<32, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
2154 | Reloc_section* rt = target->rel_tls_desc_section(layout); |
2155 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
2156 | elfcpp::R_386_TLS_DESC, 0); |
2157 | } | |
2158 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2159 | { | |
2160 | // Create a GOT entry for the tp-relative offset. | |
2161 | Output_data_got<32, false>* got | |
2162 | = target->got_section(symtab, layout); | |
2163 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
2164 | target->rel_dyn_section(layout), | |
2165 | elfcpp::R_386_TLS_TPOFF); | |
2166 | } | |
2167 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2168 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
2169 | break; |
2170 | ||
2171 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
2172 | break; |
2173 | ||
56622147 | 2174 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
2175 | if (optimized_type == tls::TLSOPT_NONE) |
2176 | { | |
2177 | // Create a GOT entry for the module index. | |
94c4710f | 2178 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
2179 | } |
2180 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
2181 | unsupported_reloc_global(object, r_type, gsym); |
2182 | break; | |
2183 | ||
56622147 | 2184 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2185 | break; |
2186 | ||
56622147 ILT |
2187 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2188 | case elfcpp::R_386_TLS_IE_32: | |
2189 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 2190 | layout->set_has_static_tls(); |
07f397ab ILT |
2191 | if (optimized_type == tls::TLSOPT_NONE) |
2192 | { | |
7bf1f802 ILT |
2193 | // For the R_386_TLS_IE relocation, we need to create a |
2194 | // dynamic relocation when building a shared library. | |
2195 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 2196 | && parameters->options().shared()) |
07f397ab | 2197 | { |
07f397ab | 2198 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
2199 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
2200 | output_section, object, | |
2201 | data_shndx, | |
2202 | reloc.get_r_offset()); | |
07f397ab | 2203 | } |
7bf1f802 ILT |
2204 | // Create a GOT entry for the tp-relative offset. |
2205 | Output_data_got<32, false>* got | |
2206 | = target->got_section(symtab, layout); | |
2207 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
2208 | ? elfcpp::R_386_TLS_TPOFF32 | |
2209 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
2210 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2211 | ? GOT_TYPE_TLS_OFFSET | |
2212 | : GOT_TYPE_TLS_NOFFSET); | |
2213 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
2214 | target->rel_dyn_section(layout), |
2215 | dyn_r_type); | |
07f397ab ILT |
2216 | } |
2217 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 2218 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 2219 | break; |
af6359d5 | 2220 | |
56622147 ILT |
2221 | case elfcpp::R_386_TLS_LE: // Local-exec |
2222 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 2223 | layout->set_has_static_tls(); |
8851ecca | 2224 | if (parameters->options().shared()) |
7bf1f802 ILT |
2225 | { |
2226 | // We need to create a dynamic relocation. | |
2227 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
2228 | ? elfcpp::R_386_TLS_TPOFF32 | |
2229 | : elfcpp::R_386_TLS_TPOFF); | |
2230 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2231 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
2232 | data_shndx, reloc.get_r_offset()); | |
2233 | } | |
56622147 ILT |
2234 | break; |
2235 | ||
af6359d5 ILT |
2236 | default: |
2237 | gold_unreachable(); | |
a3ad94ed ILT |
2238 | } |
2239 | } | |
92e059d8 ILT |
2240 | break; |
2241 | ||
92e059d8 ILT |
2242 | case elfcpp::R_386_32PLT: |
2243 | case elfcpp::R_386_TLS_GD_32: | |
2244 | case elfcpp::R_386_TLS_GD_PUSH: | |
2245 | case elfcpp::R_386_TLS_GD_CALL: | |
2246 | case elfcpp::R_386_TLS_GD_POP: | |
2247 | case elfcpp::R_386_TLS_LDM_32: | |
2248 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2249 | case elfcpp::R_386_TLS_LDM_CALL: | |
2250 | case elfcpp::R_386_TLS_LDM_POP: | |
2251 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2252 | default: | |
af6359d5 | 2253 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
2254 | break; |
2255 | } | |
2256 | } | |
2257 | ||
6d03d481 ST |
2258 | // Process relocations for gc. |
2259 | ||
2260 | void | |
ad0f2072 | 2261 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 2262 | Layout* layout, |
6fa2a40b | 2263 | Sized_relobj_file<32, false>* object, |
6d03d481 ST |
2264 | unsigned int data_shndx, |
2265 | unsigned int, | |
2266 | const unsigned char* prelocs, | |
2267 | size_t reloc_count, | |
2268 | Output_section* output_section, | |
2269 | bool needs_special_offset_handling, | |
2270 | size_t local_symbol_count, | |
2271 | const unsigned char* plocal_symbols) | |
2272 | { | |
2273 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
41cbeecc ST |
2274 | Target_i386::Scan, |
2275 | Target_i386::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2276 | symtab, |
2277 | layout, | |
2278 | this, | |
2279 | object, | |
2280 | data_shndx, | |
2281 | prelocs, | |
2282 | reloc_count, | |
2283 | output_section, | |
2284 | needs_special_offset_handling, | |
2285 | local_symbol_count, | |
2286 | plocal_symbols); | |
2287 | } | |
2288 | ||
92e059d8 ILT |
2289 | // Scan relocations for a section. |
2290 | ||
2291 | void | |
ad0f2072 | 2292 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 2293 | Layout* layout, |
6fa2a40b | 2294 | Sized_relobj_file<32, false>* object, |
a3ad94ed | 2295 | unsigned int data_shndx, |
92e059d8 ILT |
2296 | unsigned int sh_type, |
2297 | const unsigned char* prelocs, | |
2298 | size_t reloc_count, | |
730cdc88 ILT |
2299 | Output_section* output_section, |
2300 | bool needs_special_offset_handling, | |
92e059d8 | 2301 | size_t local_symbol_count, |
730cdc88 | 2302 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
2303 | { |
2304 | if (sh_type == elfcpp::SHT_RELA) | |
2305 | { | |
75f2446e ILT |
2306 | gold_error(_("%s: unsupported RELA reloc section"), |
2307 | object->name().c_str()); | |
2308 | return; | |
92e059d8 ILT |
2309 | } |
2310 | ||
ead1e424 ILT |
2311 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
2312 | Target_i386::Scan>( | |
92e059d8 | 2313 | symtab, |
ead1e424 ILT |
2314 | layout, |
2315 | this, | |
92e059d8 | 2316 | object, |
a3ad94ed | 2317 | data_shndx, |
92e059d8 ILT |
2318 | prelocs, |
2319 | reloc_count, | |
730cdc88 ILT |
2320 | output_section, |
2321 | needs_special_offset_handling, | |
92e059d8 | 2322 | local_symbol_count, |
730cdc88 | 2323 | plocal_symbols); |
92e059d8 ILT |
2324 | } |
2325 | ||
16649710 | 2326 | // Finalize the sections. |
5a6f7e2d ILT |
2327 | |
2328 | void | |
f59f41f3 DK |
2329 | Target_i386::do_finalize_sections( |
2330 | Layout* layout, | |
2331 | const Input_objects*, | |
e785ec03 | 2332 | Symbol_table* symtab) |
5a6f7e2d | 2333 | { |
ea715a34 ILT |
2334 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2335 | ? NULL | |
2336 | : this->plt_->rel_plt()); | |
2337 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
612a8d3d | 2338 | this->rel_dyn_, true, false); |
16649710 ILT |
2339 | |
2340 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2341 | // relocs. | |
12c0daef ILT |
2342 | if (this->copy_relocs_.any_saved_relocs()) |
2343 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
e785ec03 ILT |
2344 | |
2345 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2346 | // the .got.plt section. | |
2347 | Symbol* sym = this->global_offset_table_; | |
2348 | if (sym != NULL) | |
2349 | { | |
2350 | uint32_t data_size = this->got_plt_->current_data_size(); | |
2351 | symtab->get_sized_symbol<32>(sym)->set_symsize(data_size); | |
2352 | } | |
28a13fec | 2353 | |
67181c72 ILT |
2354 | if (parameters->doing_static_link() |
2355 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2356 | { |
2357 | // If linking statically, make sure that the __rel_iplt symbols | |
2358 | // were defined if necessary, even if we didn't create a PLT. | |
2359 | static const Define_symbol_in_segment syms[] = | |
2360 | { | |
2361 | { | |
2362 | "__rel_iplt_start", // name | |
2363 | elfcpp::PT_LOAD, // segment_type | |
2364 | elfcpp::PF_W, // segment_flags_set | |
2365 | elfcpp::PF(0), // segment_flags_clear | |
2366 | 0, // value | |
2367 | 0, // size | |
2368 | elfcpp::STT_NOTYPE, // type | |
2369 | elfcpp::STB_GLOBAL, // binding | |
2370 | elfcpp::STV_HIDDEN, // visibility | |
2371 | 0, // nonvis | |
2372 | Symbol::SEGMENT_START, // offset_from_base | |
2373 | true // only_if_ref | |
2374 | }, | |
2375 | { | |
2376 | "__rel_iplt_end", // name | |
2377 | elfcpp::PT_LOAD, // segment_type | |
2378 | elfcpp::PF_W, // segment_flags_set | |
2379 | elfcpp::PF(0), // segment_flags_clear | |
2380 | 0, // value | |
2381 | 0, // size | |
2382 | elfcpp::STT_NOTYPE, // type | |
2383 | elfcpp::STB_GLOBAL, // binding | |
2384 | elfcpp::STV_HIDDEN, // visibility | |
2385 | 0, // nonvis | |
2386 | Symbol::SEGMENT_START, // offset_from_base | |
2387 | true // only_if_ref | |
2388 | } | |
2389 | }; | |
2390 | ||
2391 | symtab->define_symbols(layout, 2, syms, | |
2392 | layout->script_options()->saw_sections_clause()); | |
2393 | } | |
5a6f7e2d ILT |
2394 | } |
2395 | ||
86849f1f ILT |
2396 | // Return whether a direct absolute static relocation needs to be applied. |
2397 | // In cases where Scan::local() or Scan::global() has created | |
2398 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
2399 | // of the relocation is carried in the data, and we must not | |
2400 | // apply the static relocation. | |
2401 | ||
2402 | inline bool | |
2403 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
95a2c8d6 | 2404 | unsigned int r_type, |
031cdbed ILT |
2405 | bool is_32bit, |
2406 | Output_section* output_section) | |
86849f1f | 2407 | { |
031cdbed ILT |
2408 | // If the output section is not allocated, then we didn't call |
2409 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
2410 | // the reloc here. | |
2411 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
2412 | return true; | |
2413 | ||
95a2c8d6 RS |
2414 | int ref_flags = Scan::get_reference_flags(r_type); |
2415 | ||
d61c6bd4 ILT |
2416 | // For local symbols, we will have created a non-RELATIVE dynamic |
2417 | // relocation only if (a) the output is position independent, | |
2418 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
2419 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 2420 | if (gsym == NULL) |
8851ecca | 2421 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 2422 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 2423 | && !is_32bit); |
86849f1f | 2424 | |
0700cf32 ILT |
2425 | // For global symbols, we use the same helper routines used in the |
2426 | // scan pass. If we did not create a dynamic relocation, or if we | |
2427 | // created a RELATIVE dynamic relocation, we should apply the static | |
2428 | // relocation. | |
2429 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
2430 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
2431 | && gsym->can_use_relative_reloc(ref_flags | |
2432 | & Symbol::FUNCTION_CALL); | |
2433 | return !has_dyn || is_rel; | |
86849f1f ILT |
2434 | } |
2435 | ||
61ba1cf9 ILT |
2436 | // Perform a relocation. |
2437 | ||
ead1e424 | 2438 | inline bool |
92e059d8 | 2439 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 2440 | Target_i386* target, |
ca09d69a | 2441 | Output_section* output_section, |
92e059d8 ILT |
2442 | size_t relnum, |
2443 | const elfcpp::Rel<32, false>& rel, | |
2444 | unsigned int r_type, | |
c06b7b0b | 2445 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2446 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2447 | unsigned char* view, |
2448 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 2449 | section_size_type view_size) |
61ba1cf9 | 2450 | { |
ead1e424 ILT |
2451 | if (this->skip_call_tls_get_addr_) |
2452 | { | |
5efc7cd2 CC |
2453 | if ((r_type != elfcpp::R_386_PLT32 |
2454 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
2455 | || gsym == NULL |
2456 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
2457 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2458 | _("missing expected TLS relocation")); | |
2459 | else | |
ead1e424 | 2460 | { |
75f2446e ILT |
2461 | this->skip_call_tls_get_addr_ = false; |
2462 | return false; | |
ead1e424 | 2463 | } |
ead1e424 ILT |
2464 | } |
2465 | ||
6fa2a40b | 2466 | const Sized_relobj_file<32, false>* object = relinfo->object; |
7223e9ca | 2467 | |
a3ad94ed | 2468 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 2469 | Symbol_value<32> symval; |
436ca963 | 2470 | if (gsym != NULL |
7223e9ca ILT |
2471 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2472 | && r_type == elfcpp::R_386_32 | |
95a2c8d6 | 2473 | && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
7223e9ca ILT |
2474 | && gsym->can_use_relative_reloc(false) |
2475 | && !gsym->is_from_dynobj() | |
2476 | && !gsym->is_undefined() | |
2477 | && !gsym->is_preemptible()) | |
2478 | { | |
2479 | // In this case we are generating a R_386_IRELATIVE reloc. We | |
2480 | // want to use the real value of the symbol, not the PLT offset. | |
2481 | } | |
2482 | else if (gsym != NULL | |
95a2c8d6 | 2483 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
a3ad94ed | 2484 | { |
67181c72 | 2485 | symval.set_output_value(target->plt_address_for_global(gsym) |
b8e6aad9 ILT |
2486 | + gsym->plt_offset()); |
2487 | psymval = &symval; | |
a3ad94ed | 2488 | } |
7223e9ca ILT |
2489 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2490 | { | |
2491 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2492 | if (object->local_has_plt_offset(r_sym)) | |
2493 | { | |
67181c72 | 2494 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
2495 | + object->local_plt_offset(r_sym)); |
2496 | psymval = &symval; | |
2497 | } | |
2498 | } | |
b8e6aad9 | 2499 | |
1b64748b | 2500 | // Get the GOT offset if needed. |
96f2030e ILT |
2501 | // The GOT pointer points to the end of the GOT section. |
2502 | // We need to subtract the size of the GOT section to get | |
2503 | // the actual offset to use in the relocation. | |
1b64748b ILT |
2504 | bool have_got_offset = false; |
2505 | unsigned int got_offset = 0; | |
2506 | switch (r_type) | |
2507 | { | |
2508 | case elfcpp::R_386_GOT32: | |
2509 | if (gsym != NULL) | |
2510 | { | |
0a65a3a7 CC |
2511 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2512 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
2513 | - target->got_size()); | |
1b64748b ILT |
2514 | } |
2515 | else | |
2516 | { | |
2517 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
2518 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2519 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2520 | - target->got_size()); | |
1b64748b ILT |
2521 | } |
2522 | have_got_offset = true; | |
2523 | break; | |
2524 | ||
2525 | default: | |
2526 | break; | |
2527 | } | |
2528 | ||
61ba1cf9 ILT |
2529 | switch (r_type) |
2530 | { | |
2531 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
2532 | case elfcpp::R_386_GNU_VTINHERIT: |
2533 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
2534 | break; |
2535 | ||
2536 | case elfcpp::R_386_32: | |
95a2c8d6 | 2537 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
86849f1f | 2538 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
2539 | break; |
2540 | ||
2541 | case elfcpp::R_386_PC32: | |
95a2c8d6 RS |
2542 | if (should_apply_static_reloc(gsym, r_type, true, output_section)) |
2543 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); | |
92e059d8 ILT |
2544 | break; |
2545 | ||
2546 | case elfcpp::R_386_16: | |
95a2c8d6 | 2547 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2548 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
2549 | break; |
2550 | ||
2551 | case elfcpp::R_386_PC16: | |
95a2c8d6 RS |
2552 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2553 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); | |
61ba1cf9 ILT |
2554 | break; |
2555 | ||
92e059d8 | 2556 | case elfcpp::R_386_8: |
95a2c8d6 | 2557 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
86849f1f | 2558 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
2559 | break; |
2560 | ||
2561 | case elfcpp::R_386_PC8: | |
95a2c8d6 RS |
2562 | if (should_apply_static_reloc(gsym, r_type, false, output_section)) |
2563 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); | |
92e059d8 ILT |
2564 | break; |
2565 | ||
ead1e424 | 2566 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
2567 | gold_assert(gsym == NULL |
2568 | || gsym->has_plt_offset() | |
99f8faca ILT |
2569 | || gsym->final_value_is_known() |
2570 | || (gsym->is_defined() | |
2571 | && !gsym->is_from_dynobj() | |
2572 | && !gsym->is_preemptible())); | |
b8e6aad9 | 2573 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
2574 | break; |
2575 | ||
2576 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
2577 | gold_assert(have_got_offset); |
2578 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
2579 | break; |
2580 | ||
2581 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
2582 | { |
2583 | elfcpp::Elf_types<32>::Elf_Addr value; | |
2584 | value = (psymval->value(object, 0) | |
96f2030e | 2585 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
2586 | Relocate_functions<32, false>::rel32(view, value); |
2587 | } | |
ead1e424 ILT |
2588 | break; |
2589 | ||
2590 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
2591 | { |
2592 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 2593 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
2594 | Relocate_functions<32, false>::pcrel32(view, value, address); |
2595 | } | |
ead1e424 ILT |
2596 | break; |
2597 | ||
92e059d8 ILT |
2598 | case elfcpp::R_386_COPY: |
2599 | case elfcpp::R_386_GLOB_DAT: | |
2600 | case elfcpp::R_386_JUMP_SLOT: | |
2601 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 2602 | case elfcpp::R_386_IRELATIVE: |
d61c17ea ILT |
2603 | // These are outstanding tls relocs, which are unexpected when |
2604 | // linking. | |
92e059d8 ILT |
2605 | case elfcpp::R_386_TLS_TPOFF: |
2606 | case elfcpp::R_386_TLS_DTPMOD32: | |
2607 | case elfcpp::R_386_TLS_DTPOFF32: | |
2608 | case elfcpp::R_386_TLS_TPOFF32: | |
2609 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
2610 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2611 | _("unexpected reloc %u in object file"), | |
2612 | r_type); | |
92e059d8 ILT |
2613 | break; |
2614 | ||
d61c17ea ILT |
2615 | // These are initial tls relocs, which are expected when |
2616 | // linking. | |
56622147 ILT |
2617 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
2618 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2619 | case elfcpp::R_386_TLS_DESC_CALL: | |
2620 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2621 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2622 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 2623 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
2624 | case elfcpp::R_386_TLS_GOTIE: |
2625 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 2626 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
2627 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
2628 | view, address, view_size); | |
92e059d8 ILT |
2629 | break; |
2630 | ||
92e059d8 ILT |
2631 | case elfcpp::R_386_32PLT: |
2632 | case elfcpp::R_386_TLS_GD_32: | |
2633 | case elfcpp::R_386_TLS_GD_PUSH: | |
2634 | case elfcpp::R_386_TLS_GD_CALL: | |
2635 | case elfcpp::R_386_TLS_GD_POP: | |
2636 | case elfcpp::R_386_TLS_LDM_32: | |
2637 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2638 | case elfcpp::R_386_TLS_LDM_CALL: | |
2639 | case elfcpp::R_386_TLS_LDM_POP: | |
2640 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 2641 | default: |
75f2446e ILT |
2642 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2643 | _("unsupported reloc %u"), | |
2644 | r_type); | |
92e059d8 ILT |
2645 | break; |
2646 | } | |
ead1e424 ILT |
2647 | |
2648 | return true; | |
92e059d8 ILT |
2649 | } |
2650 | ||
2651 | // Perform a TLS relocation. | |
2652 | ||
2653 | inline void | |
2654 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 2655 | Target_i386* target, |
92e059d8 ILT |
2656 | size_t relnum, |
2657 | const elfcpp::Rel<32, false>& rel, | |
2658 | unsigned int r_type, | |
c06b7b0b | 2659 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 2660 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
2661 | unsigned char* view, |
2662 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 2663 | section_size_type view_size) |
92e059d8 ILT |
2664 | { |
2665 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 2666 | |
6fa2a40b | 2667 | const Sized_relobj_file<32, false>* object = relinfo->object; |
07f397ab ILT |
2668 | |
2669 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 2670 | |
b3705d2a ILT |
2671 | const bool is_final = (gsym == NULL |
2672 | ? !parameters->options().shared() | |
2673 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
2674 | const tls::Tls_optimization optimized_type |
2675 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
2676 | switch (r_type) |
2677 | { | |
56622147 | 2678 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 2679 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 2680 | { |
62855347 ILT |
2681 | if (tls_segment == NULL) |
2682 | { | |
191f1a2d ILT |
2683 | gold_assert(parameters->errors()->error_count() > 0 |
2684 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2685 | return; |
2686 | } | |
56622147 ILT |
2687 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
2688 | rel, r_type, value, view, | |
2689 | view_size); | |
92e059d8 ILT |
2690 | break; |
2691 | } | |
07f397ab ILT |
2692 | else |
2693 | { | |
c2b45e22 CC |
2694 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2695 | ? GOT_TYPE_TLS_NOFFSET | |
2696 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
2697 | unsigned int got_offset; |
2698 | if (gsym != NULL) | |
2699 | { | |
c2b45e22 CC |
2700 | gold_assert(gsym->has_got_offset(got_type)); |
2701 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
2702 | } |
2703 | else | |
2704 | { | |
2705 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2706 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2707 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
2708 | - target->got_size()); |
2709 | } | |
2710 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2711 | { | |
62855347 ILT |
2712 | if (tls_segment == NULL) |
2713 | { | |
191f1a2d ILT |
2714 | gold_assert(parameters->errors()->error_count() > 0 |
2715 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2716 | return; |
2717 | } | |
7bf1f802 ILT |
2718 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2719 | got_offset, view, view_size); | |
07f397ab ILT |
2720 | break; |
2721 | } | |
2722 | else if (optimized_type == tls::TLSOPT_NONE) | |
2723 | { | |
2724 | // Relocate the field with the offset of the pair of GOT | |
2725 | // entries. | |
2726 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2727 | break; | |
2728 | } | |
2729 | } | |
75f2446e ILT |
2730 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2731 | _("unsupported reloc %u"), | |
2732 | r_type); | |
92e059d8 ILT |
2733 | break; |
2734 | ||
56622147 ILT |
2735 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
2736 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 2737 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
2738 | if (optimized_type == tls::TLSOPT_TO_LE) |
2739 | { | |
62855347 ILT |
2740 | if (tls_segment == NULL) |
2741 | { | |
191f1a2d ILT |
2742 | gold_assert(parameters->errors()->error_count() > 0 |
2743 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2744 | return; |
2745 | } | |
c2b45e22 CC |
2746 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2747 | rel, r_type, value, view, | |
2748 | view_size); | |
2749 | break; | |
2750 | } | |
2751 | else | |
2752 | { | |
2753 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2754 | ? GOT_TYPE_TLS_NOFFSET | |
2755 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2756 | unsigned int got_offset = 0; |
2757 | if (r_type == elfcpp::R_386_TLS_GOTDESC | |
2758 | && optimized_type == tls::TLSOPT_NONE) | |
2759 | { | |
2760 | // We created GOT entries in the .got.tlsdesc portion of | |
2761 | // the .got.plt section, but the offset stored in the | |
2762 | // symbol is the offset within .got.tlsdesc. | |
2763 | got_offset = (target->got_size() | |
2764 | + target->got_plt_section()->data_size()); | |
2765 | } | |
c2b45e22 CC |
2766 | if (gsym != NULL) |
2767 | { | |
2768 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2769 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2770 | } |
2771 | else | |
2772 | { | |
2773 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
2774 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2775 | got_offset += (object->local_got_offset(r_sym, got_type) |
2776 | - target->got_size()); | |
c2b45e22 CC |
2777 | } |
2778 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2779 | { | |
62855347 ILT |
2780 | if (tls_segment == NULL) |
2781 | { | |
191f1a2d ILT |
2782 | gold_assert(parameters->errors()->error_count() > 0 |
2783 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2784 | return; |
2785 | } | |
c2b45e22 CC |
2786 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
2787 | got_offset, view, view_size); | |
2788 | break; | |
2789 | } | |
2790 | else if (optimized_type == tls::TLSOPT_NONE) | |
2791 | { | |
2792 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2793 | { | |
2794 | // Relocate the field with the offset of the pair of GOT | |
2795 | // entries. | |
2796 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2797 | } | |
2798 | break; | |
2799 | } | |
2800 | } | |
75f2446e ILT |
2801 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2802 | _("unsupported reloc %u"), | |
2803 | r_type); | |
ead1e424 ILT |
2804 | break; |
2805 | ||
56622147 | 2806 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
2807 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
2808 | { | |
75f2446e ILT |
2809 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2810 | _("both SUN and GNU model " | |
2811 | "TLS relocations")); | |
2812 | break; | |
46cf9fa2 ILT |
2813 | } |
2814 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 2815 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2816 | { |
62855347 ILT |
2817 | if (tls_segment == NULL) |
2818 | { | |
191f1a2d ILT |
2819 | gold_assert(parameters->errors()->error_count() > 0 |
2820 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2821 | return; |
2822 | } | |
46cf9fa2 ILT |
2823 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2824 | value, view, view_size); | |
2825 | break; | |
2826 | } | |
07f397ab ILT |
2827 | else if (optimized_type == tls::TLSOPT_NONE) |
2828 | { | |
2829 | // Relocate the field with the offset of the GOT entry for | |
2830 | // the module index. | |
2831 | unsigned int got_offset; | |
94c4710f ILT |
2832 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2833 | - target->got_size()); | |
07f397ab ILT |
2834 | Relocate_functions<32, false>::rel32(view, got_offset); |
2835 | break; | |
2836 | } | |
75f2446e ILT |
2837 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2838 | _("unsupported reloc %u"), | |
2839 | r_type); | |
46cf9fa2 ILT |
2840 | break; |
2841 | ||
56622147 | 2842 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2843 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2844 | { |
82bb573a ILT |
2845 | // This reloc can appear in debugging sections, in which |
2846 | // case we must not convert to local-exec. We decide what | |
2847 | // to do based on whether the section is marked as | |
2848 | // containing executable code. That is what the GNU linker | |
2849 | // does as well. | |
2850 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2851 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 | 2852 | { |
62855347 ILT |
2853 | if (tls_segment == NULL) |
2854 | { | |
191f1a2d ILT |
2855 | gold_assert(parameters->errors()->error_count() > 0 |
2856 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2857 | return; |
2858 | } | |
d6f22b98 ILT |
2859 | value -= tls_segment->memsz(); |
2860 | } | |
e8a9fcda | 2861 | } |
46cf9fa2 ILT |
2862 | Relocate_functions<32, false>::rel32(view, value); |
2863 | break; | |
2864 | ||
56622147 ILT |
2865 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2866 | case elfcpp::R_386_TLS_GOTIE: | |
2867 | case elfcpp::R_386_TLS_IE_32: | |
2868 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2869 | { | |
62855347 ILT |
2870 | if (tls_segment == NULL) |
2871 | { | |
191f1a2d ILT |
2872 | gold_assert(parameters->errors()->error_count() > 0 |
2873 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2874 | return; |
2875 | } | |
56622147 ILT |
2876 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2877 | rel, r_type, value, view, | |
2878 | view_size); | |
2879 | break; | |
2880 | } | |
07f397ab ILT |
2881 | else if (optimized_type == tls::TLSOPT_NONE) |
2882 | { | |
2883 | // Relocate the field with the offset of the GOT entry for | |
2884 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2885 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2886 | ? GOT_TYPE_TLS_OFFSET | |
2887 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2888 | unsigned int got_offset; |
2889 | if (gsym != NULL) | |
2890 | { | |
c2b45e22 CC |
2891 | gold_assert(gsym->has_got_offset(got_type)); |
2892 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2893 | } |
2894 | else | |
2895 | { | |
2896 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2897 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2898 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2899 | } |
2900 | // For the R_386_TLS_IE relocation, we need to apply the | |
2901 | // absolute address of the GOT entry. | |
2902 | if (r_type == elfcpp::R_386_TLS_IE) | |
2903 | got_offset += target->got_plt_section()->address(); | |
2904 | // All GOT offsets are relative to the end of the GOT. | |
2905 | got_offset -= target->got_size(); | |
2906 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2907 | break; | |
2908 | } | |
75f2446e ILT |
2909 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2910 | _("unsupported reloc %u"), | |
2911 | r_type); | |
92e059d8 | 2912 | break; |
92e059d8 | 2913 | |
56622147 | 2914 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2915 | // If we're creating a shared library, a dynamic relocation will |
2916 | // have been created for this location, so do not apply it now. | |
8851ecca | 2917 | if (!parameters->options().shared()) |
7bf1f802 | 2918 | { |
62855347 ILT |
2919 | if (tls_segment == NULL) |
2920 | { | |
191f1a2d ILT |
2921 | gold_assert(parameters->errors()->error_count() > 0 |
2922 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2923 | return; |
2924 | } | |
7bf1f802 ILT |
2925 | value -= tls_segment->memsz(); |
2926 | Relocate_functions<32, false>::rel32(view, value); | |
2927 | } | |
56622147 | 2928 | break; |
92e059d8 | 2929 | |
56622147 | 2930 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2931 | // If we're creating a shared library, a dynamic relocation will |
2932 | // have been created for this location, so do not apply it now. | |
8851ecca | 2933 | if (!parameters->options().shared()) |
7bf1f802 | 2934 | { |
62855347 ILT |
2935 | if (tls_segment == NULL) |
2936 | { | |
191f1a2d ILT |
2937 | gold_assert(parameters->errors()->error_count() > 0 |
2938 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
2939 | return; |
2940 | } | |
7bf1f802 ILT |
2941 | value = tls_segment->memsz() - value; |
2942 | Relocate_functions<32, false>::rel32(view, value); | |
2943 | } | |
56622147 | 2944 | break; |
92e059d8 | 2945 | } |
92e059d8 ILT |
2946 | } |
2947 | ||
e041f13d | 2948 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2949 | // Local-Exec. |
2950 | ||
2951 | inline void | |
2952 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2953 | size_t relnum, | |
2954 | Output_segment* tls_segment, | |
2955 | const elfcpp::Rel<32, false>& rel, | |
2956 | unsigned int, | |
2957 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2958 | unsigned char* view, | |
fe8718a4 | 2959 | section_size_type view_size) |
ead1e424 ILT |
2960 | { |
2961 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2962 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2963 | // leal foo(%reg),%eax; call ___tls_get_addr |
2964 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2965 | ||
af6359d5 ILT |
2966 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2967 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2968 | |
2969 | unsigned char op1 = view[-1]; | |
2970 | unsigned char op2 = view[-2]; | |
2971 | ||
af6359d5 ILT |
2972 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2973 | op2 == 0x8d || op2 == 0x04); | |
2974 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2975 | |
2976 | int roff = 5; | |
2977 | ||
2978 | if (op2 == 0x04) | |
2979 | { | |
af6359d5 ILT |
2980 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2981 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2982 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2983 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2984 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2985 | } | |
2986 | else | |
2987 | { | |
af6359d5 ILT |
2988 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2989 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2990 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2991 | && view[9] == 0x90) |
ead1e424 ILT |
2992 | { |
2993 | // There is a trailing nop. Use the size byte subl. | |
2994 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2995 | roff = 6; | |
2996 | } | |
2997 | else | |
2998 | { | |
2999 | // Use the five byte subl. | |
3000 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3001 | } | |
3002 | } | |
3003 | ||
7bf1f802 | 3004 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
3005 | Relocate_functions<32, false>::rel32(view + roff, value); |
3006 | ||
3007 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3008 | // We can skip it. | |
3009 | this->skip_call_tls_get_addr_ = true; | |
3010 | } | |
3011 | ||
7bf1f802 | 3012 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
3013 | // Initial-Exec. |
3014 | ||
3015 | inline void | |
3016 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
3017 | size_t relnum, | |
c2b45e22 | 3018 | Output_segment*, |
07f397ab ILT |
3019 | const elfcpp::Rel<32, false>& rel, |
3020 | unsigned int, | |
3021 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3022 | unsigned char* view, | |
fe8718a4 | 3023 | section_size_type view_size) |
07f397ab ILT |
3024 | { |
3025 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
3026 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
3027 | ||
3028 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3029 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
3030 | ||
3031 | unsigned char op1 = view[-1]; | |
3032 | unsigned char op2 = view[-2]; | |
3033 | ||
3034 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3035 | op2 == 0x8d || op2 == 0x04); | |
3036 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
3037 | ||
3038 | int roff = 5; | |
3039 | ||
c2b45e22 CC |
3040 | // FIXME: For now, support only the first (SIB) form. |
3041 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
3042 | |
3043 | if (op2 == 0x04) | |
3044 | { | |
3045 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
3046 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
3047 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3048 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
3049 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
3050 | } | |
3051 | else | |
3052 | { | |
3053 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3054 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 3055 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
3056 | && view[9] == 0x90) |
3057 | { | |
3058 | // FIXME: This is not the right instruction sequence. | |
3059 | // There is a trailing nop. Use the size byte subl. | |
3060 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
3061 | roff = 6; | |
3062 | } | |
3063 | else | |
3064 | { | |
3065 | // FIXME: This is not the right instruction sequence. | |
3066 | // Use the five byte subl. | |
3067 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
3068 | } | |
3069 | } | |
3070 | ||
07f397ab ILT |
3071 | Relocate_functions<32, false>::rel32(view + roff, value); |
3072 | ||
3073 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3074 | // We can skip it. | |
3075 | this->skip_call_tls_get_addr_ = true; | |
3076 | } | |
3077 | ||
c2b45e22 CC |
3078 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
3079 | // General-Dynamic to a Local-Exec. | |
3080 | ||
3081 | inline void | |
3082 | Target_i386::Relocate::tls_desc_gd_to_le( | |
3083 | const Relocate_info<32, false>* relinfo, | |
3084 | size_t relnum, | |
3085 | Output_segment* tls_segment, | |
3086 | const elfcpp::Rel<32, false>& rel, | |
3087 | unsigned int r_type, | |
3088 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3089 | unsigned char* view, | |
3090 | section_size_type view_size) | |
3091 | { | |
3092 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3093 | { | |
3094 | // leal foo@TLSDESC(%ebx), %eax | |
3095 | // ==> leal foo@NTPOFF, %eax | |
3096 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3097 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3098 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3099 | view[-2] == 0x8d && view[-1] == 0x83); | |
3100 | view[-1] = 0x05; | |
3101 | value -= tls_segment->memsz(); | |
3102 | Relocate_functions<32, false>::rel32(view, value); | |
3103 | } | |
3104 | else | |
3105 | { | |
3106 | // call *foo@TLSCALL(%eax) | |
3107 | // ==> nop; nop | |
3108 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3109 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3110 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3111 | view[0] == 0xff && view[1] == 0x10); | |
3112 | view[0] = 0x66; | |
3113 | view[1] = 0x90; | |
3114 | } | |
3115 | } | |
3116 | ||
3117 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
3118 | // General-Dynamic to an Initial-Exec. | |
3119 | ||
3120 | inline void | |
3121 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
3122 | const Relocate_info<32, false>* relinfo, | |
3123 | size_t relnum, | |
3124 | Output_segment*, | |
3125 | const elfcpp::Rel<32, false>& rel, | |
3126 | unsigned int r_type, | |
3127 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3128 | unsigned char* view, | |
3129 | section_size_type view_size) | |
3130 | { | |
3131 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
3132 | { | |
3133 | // leal foo@TLSDESC(%ebx), %eax | |
3134 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
3135 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3136 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3137 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3138 | view[-2] == 0x8d && view[-1] == 0x83); | |
3139 | view[-2] = 0x8b; | |
3140 | Relocate_functions<32, false>::rel32(view, value); | |
3141 | } | |
3142 | else | |
3143 | { | |
3144 | // call *foo@TLSCALL(%eax) | |
3145 | // ==> nop; nop | |
3146 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
3147 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
3148 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3149 | view[0] == 0xff && view[1] == 0x10); | |
3150 | view[0] = 0x66; | |
3151 | view[1] = 0x90; | |
3152 | } | |
3153 | } | |
3154 | ||
46cf9fa2 ILT |
3155 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
3156 | // Local-Exec. | |
3157 | ||
3158 | inline void | |
3159 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
3160 | size_t relnum, | |
3161 | Output_segment*, | |
3162 | const elfcpp::Rel<32, false>& rel, | |
3163 | unsigned int, | |
3164 | elfcpp::Elf_types<32>::Elf_Addr, | |
3165 | unsigned char* view, | |
fe8718a4 | 3166 | section_size_type view_size) |
46cf9fa2 ILT |
3167 | { |
3168 | // leal foo(%reg), %eax; call ___tls_get_addr | |
3169 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
3170 | ||
af6359d5 ILT |
3171 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
3172 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
3173 | |
3174 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
3175 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
3176 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 3177 | |
af6359d5 | 3178 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
3179 | |
3180 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
3181 | ||
3182 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3183 | // We can skip it. | |
3184 | this->skip_call_tls_get_addr_ = true; | |
3185 | } | |
3186 | ||
56622147 ILT |
3187 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3188 | // Local-Exec. | |
3189 | ||
3190 | inline void | |
3191 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
3192 | size_t relnum, | |
3193 | Output_segment* tls_segment, | |
3194 | const elfcpp::Rel<32, false>& rel, | |
3195 | unsigned int r_type, | |
3196 | elfcpp::Elf_types<32>::Elf_Addr value, | |
3197 | unsigned char* view, | |
fe8718a4 | 3198 | section_size_type view_size) |
56622147 ILT |
3199 | { |
3200 | // We have to actually change the instructions, which means that we | |
3201 | // need to examine the opcodes to figure out which instruction we | |
3202 | // are looking at. | |
3203 | if (r_type == elfcpp::R_386_TLS_IE) | |
3204 | { | |
3205 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
3206 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
3207 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
3208 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
3209 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3210 | ||
3211 | unsigned char op1 = view[-1]; | |
3212 | if (op1 == 0xa1) | |
3213 | { | |
3214 | // movl XX,%eax ==> movl $YY,%eax | |
3215 | view[-1] = 0xb8; | |
3216 | } | |
3217 | else | |
3218 | { | |
3219 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3220 | ||
3221 | unsigned char op2 = view[-2]; | |
3222 | if (op2 == 0x8b) | |
3223 | { | |
3224 | // movl XX,%reg ==> movl $YY,%reg | |
3225 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3226 | (op1 & 0xc7) == 0x05); | |
3227 | view[-2] = 0xc7; | |
3228 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3229 | } | |
3230 | else if (op2 == 0x03) | |
3231 | { | |
3232 | // addl XX,%reg ==> addl $YY,%reg | |
3233 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3234 | (op1 & 0xc7) == 0x05); | |
3235 | view[-2] = 0x81; | |
3236 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3237 | } | |
3238 | else | |
3239 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3240 | } | |
3241 | } | |
3242 | else | |
3243 | { | |
3244 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3245 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3246 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3247 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
3248 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
3249 | ||
3250 | unsigned char op1 = view[-1]; | |
3251 | unsigned char op2 = view[-2]; | |
3252 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
3253 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
3254 | if (op2 == 0x8b) | |
3255 | { | |
3256 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
3257 | view[-2] = 0xc7; | |
3258 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3259 | } | |
3260 | else if (op2 == 0x2b) | |
3261 | { | |
3262 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
3263 | view[-2] = 0x81; | |
3264 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
3265 | } | |
3266 | else if (op2 == 0x03) | |
3267 | { | |
3268 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
3269 | view[-2] = 0x81; | |
3270 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
3271 | } | |
3272 | else | |
3273 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
3274 | } | |
3275 | ||
7bf1f802 | 3276 | value = tls_segment->memsz() - value; |
56622147 ILT |
3277 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
3278 | value = - value; | |
3279 | ||
3280 | Relocate_functions<32, false>::rel32(view, value); | |
3281 | } | |
3282 | ||
61ba1cf9 ILT |
3283 | // Relocate section data. |
3284 | ||
3285 | void | |
92e059d8 | 3286 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
3287 | unsigned int sh_type, |
3288 | const unsigned char* prelocs, | |
3289 | size_t reloc_count, | |
730cdc88 ILT |
3290 | Output_section* output_section, |
3291 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
3292 | unsigned char* view, |
3293 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3294 | section_size_type view_size, |
3295 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 3296 | { |
a3ad94ed | 3297 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 3298 | |
ead1e424 ILT |
3299 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
3300 | Target_i386::Relocate>( | |
92e059d8 | 3301 | relinfo, |
ead1e424 | 3302 | this, |
61ba1cf9 ILT |
3303 | prelocs, |
3304 | reloc_count, | |
730cdc88 ILT |
3305 | output_section, |
3306 | needs_special_offset_handling, | |
61ba1cf9 ILT |
3307 | view, |
3308 | address, | |
364c7fa5 ILT |
3309 | view_size, |
3310 | reloc_symbol_changes); | |
61ba1cf9 ILT |
3311 | } |
3312 | ||
6a74a719 ILT |
3313 | // Return the size of a relocation while scanning during a relocatable |
3314 | // link. | |
3315 | ||
3316 | unsigned int | |
3317 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
3318 | unsigned int r_type, | |
3319 | Relobj* object) | |
3320 | { | |
3321 | switch (r_type) | |
3322 | { | |
3323 | case elfcpp::R_386_NONE: | |
3324 | case elfcpp::R_386_GNU_VTINHERIT: | |
3325 | case elfcpp::R_386_GNU_VTENTRY: | |
3326 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
3327 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
3328 | case elfcpp::R_386_TLS_DESC_CALL: | |
3329 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
3330 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
3331 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
3332 | case elfcpp::R_386_TLS_IE_32: | |
3333 | case elfcpp::R_386_TLS_GOTIE: | |
3334 | case elfcpp::R_386_TLS_LE: // Local-exec | |
3335 | case elfcpp::R_386_TLS_LE_32: | |
3336 | return 0; | |
3337 | ||
3338 | case elfcpp::R_386_32: | |
3339 | case elfcpp::R_386_PC32: | |
3340 | case elfcpp::R_386_GOT32: | |
3341 | case elfcpp::R_386_PLT32: | |
3342 | case elfcpp::R_386_GOTOFF: | |
3343 | case elfcpp::R_386_GOTPC: | |
3344 | return 4; | |
3345 | ||
3346 | case elfcpp::R_386_16: | |
3347 | case elfcpp::R_386_PC16: | |
3348 | return 2; | |
3349 | ||
3350 | case elfcpp::R_386_8: | |
3351 | case elfcpp::R_386_PC8: | |
3352 | return 1; | |
3353 | ||
3354 | // These are relocations which should only be seen by the | |
3355 | // dynamic linker, and should never be seen here. | |
3356 | case elfcpp::R_386_COPY: | |
3357 | case elfcpp::R_386_GLOB_DAT: | |
3358 | case elfcpp::R_386_JUMP_SLOT: | |
3359 | case elfcpp::R_386_RELATIVE: | |
7223e9ca | 3360 | case elfcpp::R_386_IRELATIVE: |
6a74a719 ILT |
3361 | case elfcpp::R_386_TLS_TPOFF: |
3362 | case elfcpp::R_386_TLS_DTPMOD32: | |
3363 | case elfcpp::R_386_TLS_DTPOFF32: | |
3364 | case elfcpp::R_386_TLS_TPOFF32: | |
3365 | case elfcpp::R_386_TLS_DESC: | |
3366 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3367 | return 0; | |
3368 | ||
3369 | case elfcpp::R_386_32PLT: | |
3370 | case elfcpp::R_386_TLS_GD_32: | |
3371 | case elfcpp::R_386_TLS_GD_PUSH: | |
3372 | case elfcpp::R_386_TLS_GD_CALL: | |
3373 | case elfcpp::R_386_TLS_GD_POP: | |
3374 | case elfcpp::R_386_TLS_LDM_32: | |
3375 | case elfcpp::R_386_TLS_LDM_PUSH: | |
3376 | case elfcpp::R_386_TLS_LDM_CALL: | |
3377 | case elfcpp::R_386_TLS_LDM_POP: | |
3378 | case elfcpp::R_386_USED_BY_INTEL_200: | |
3379 | default: | |
3380 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3381 | return 0; | |
3382 | } | |
3383 | } | |
3384 | ||
3385 | // Scan the relocs during a relocatable link. | |
3386 | ||
3387 | void | |
ad0f2072 | 3388 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 3389 | Layout* layout, |
6fa2a40b | 3390 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
3391 | unsigned int data_shndx, |
3392 | unsigned int sh_type, | |
3393 | const unsigned char* prelocs, | |
3394 | size_t reloc_count, | |
3395 | Output_section* output_section, | |
3396 | bool needs_special_offset_handling, | |
3397 | size_t local_symbol_count, | |
3398 | const unsigned char* plocal_symbols, | |
3399 | Relocatable_relocs* rr) | |
3400 | { | |
3401 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3402 | ||
3403 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3404 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3405 | ||
7019cd25 | 3406 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 3407 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3408 | symtab, |
3409 | layout, | |
3410 | object, | |
3411 | data_shndx, | |
3412 | prelocs, | |
3413 | reloc_count, | |
3414 | output_section, | |
3415 | needs_special_offset_handling, | |
3416 | local_symbol_count, | |
3417 | plocal_symbols, | |
3418 | rr); | |
3419 | } | |
3420 | ||
3421 | // Relocate a section during a relocatable link. | |
3422 | ||
3423 | void | |
3424 | Target_i386::relocate_for_relocatable( | |
3425 | const Relocate_info<32, false>* relinfo, | |
3426 | unsigned int sh_type, | |
3427 | const unsigned char* prelocs, | |
3428 | size_t reloc_count, | |
3429 | Output_section* output_section, | |
3430 | off_t offset_in_output_section, | |
3431 | const Relocatable_relocs* rr, | |
3432 | unsigned char* view, | |
3433 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3434 | section_size_type view_size, | |
3435 | unsigned char* reloc_view, | |
3436 | section_size_type reloc_view_size) | |
3437 | { | |
3438 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3439 | ||
7019cd25 | 3440 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
3441 | relinfo, |
3442 | prelocs, | |
3443 | reloc_count, | |
3444 | output_section, | |
3445 | offset_in_output_section, | |
3446 | rr, | |
3447 | view, | |
3448 | view_address, | |
3449 | view_size, | |
3450 | reloc_view, | |
3451 | reloc_view_size); | |
3452 | } | |
3453 | ||
ab5c9e90 ILT |
3454 | // Return the value to use for a dynamic which requires special |
3455 | // treatment. This is how we support equality comparisons of function | |
3456 | // pointers across shared library boundaries, as described in the | |
3457 | // processor specific ABI supplement. | |
3458 | ||
3459 | uint64_t | |
3460 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
3461 | { | |
3462 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 3463 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
ab5c9e90 ILT |
3464 | } |
3465 | ||
c51e6221 ILT |
3466 | // Return a string used to fill a code section with nops to take up |
3467 | // the specified length. | |
3468 | ||
3469 | std::string | |
8851ecca | 3470 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
3471 | { |
3472 | if (length >= 16) | |
3473 | { | |
3474 | // Build a jmp instruction to skip over the bytes. | |
3475 | unsigned char jmp[5]; | |
3476 | jmp[0] = 0xe9; | |
3477 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
3478 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
3479 | + std::string(length - 5, '\0')); | |
3480 | } | |
3481 | ||
3482 | // Nop sequences of various lengths. | |
3483 | const char nop1[1] = { 0x90 }; // nop | |
3484 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
3485 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
3486 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
3487 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
3488 | 0x00 }; // leal 0(%esi,1),%esi | |
3489 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3490 | 0x00, 0x00 }; | |
3491 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3492 | 0x00, 0x00, 0x00 }; | |
3493 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
3494 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
3495 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
3496 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3497 | 0x00 }; | |
3498 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
3499 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
3500 | 0x00, 0x00 }; | |
3501 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
3502 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
3503 | 0x00, 0x00, 0x00 }; | |
3504 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3505 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
3506 | 0x00, 0x00, 0x00, 0x00 }; | |
3507 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
3508 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
3509 | 0x27, 0x00, 0x00, 0x00, | |
3510 | 0x00 }; | |
3511 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
3512 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
3513 | 0xbc, 0x27, 0x00, 0x00, | |
3514 | 0x00, 0x00 }; | |
3515 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
3516 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
3517 | 0x90, 0x90, 0x90, 0x90, | |
3518 | 0x90, 0x90, 0x90 }; | |
3519 | ||
3520 | const char* nops[16] = { | |
3521 | NULL, | |
3522 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3523 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3524 | }; | |
3525 | ||
3526 | return std::string(nops[length], length); | |
3527 | } | |
3528 | ||
02d7cd44 ILT |
3529 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
3530 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
3531 | // assembler can not write out the difference between two labels in | |
3532 | // different sections, so instead of using a pc-relative value they | |
3533 | // use an offset from the GOT. | |
3534 | ||
3535 | uint64_t | |
3536 | Target_i386::do_ehframe_datarel_base() const | |
3537 | { | |
3538 | gold_assert(this->global_offset_table_ != NULL); | |
3539 | Symbol* sym = this->global_offset_table_; | |
3540 | Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym); | |
3541 | return ssym->value(); | |
3542 | } | |
3543 | ||
b6848d3c ILT |
3544 | // Return whether SYM should be treated as a call to a non-split |
3545 | // function. We don't want that to be true of a call to a | |
3546 | // get_pc_thunk function. | |
3547 | ||
3548 | bool | |
3549 | Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const | |
3550 | { | |
3551 | return (sym->type() == elfcpp::STT_FUNC | |
b6848d3c ILT |
3552 | && !is_prefix_of("__i686.get_pc_thunk.", sym->name())); |
3553 | } | |
3554 | ||
364c7fa5 | 3555 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3556 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3557 | // code. We have to change the function so that it always ensures |
3558 | // that it has enough stack space to run some random function. | |
3559 | ||
3560 | void | |
3561 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3562 | section_offset_type fnoffset, | |
3563 | section_size_type fnsize, | |
3564 | unsigned char* view, | |
3565 | section_size_type view_size, | |
3566 | std::string* from, | |
3567 | std::string* to) const | |
3568 | { | |
3569 | // The function starts with a comparison of the stack pointer and a | |
3570 | // field in the TCB. This is followed by a jump. | |
3571 | ||
3572 | // cmp %gs:NN,%esp | |
3573 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
3574 | && fnsize > 7) | |
3575 | { | |
3576 | // We will call __morestack if the carry flag is set after this | |
3577 | // comparison. We turn the comparison into an stc instruction | |
3578 | // and some nops. | |
3579 | view[fnoffset] = '\xf9'; | |
3580 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
3581 | } | |
3582 | // lea NN(%esp),%ecx | |
1782c879 ILT |
3583 | // lea NN(%esp),%edx |
3584 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
3585 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
3586 | && fnsize > 7) |
3587 | { | |
3588 | // This is loading an offset from the stack pointer for a | |
3589 | // comparison. The offset is negative, so we decrease the | |
3590 | // offset by the amount of space we need for the stack. This | |
3591 | // means we will avoid calling __morestack if there happens to | |
3592 | // be plenty of space on the stack already. | |
3593 | unsigned char* pval = view + fnoffset + 3; | |
3594 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3595 | val -= parameters->options().split_stack_adjust_size(); | |
3596 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3597 | } | |
3598 | else | |
3599 | { | |
3600 | if (!object->has_no_split_stack()) | |
3601 | object->error(_("failed to match split-stack sequence at " | |
3602 | "section %u offset %0zx"), | |
ac33a407 | 3603 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3604 | return; |
3605 | } | |
3606 | ||
3607 | // We have to change the function so that it calls | |
3608 | // __morestack_non_split instead of __morestack. The former will | |
3609 | // allocate additional stack space. | |
3610 | *from = "__morestack"; | |
3611 | *to = "__morestack_non_split"; | |
3612 | } | |
3613 | ||
14bfc3f5 ILT |
3614 | // The selector for i386 object files. |
3615 | ||
36959681 | 3616 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
3617 | { |
3618 | public: | |
3619 | Target_selector_i386() | |
36959681 | 3620 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
03ef7571 ILT |
3621 | "elf32-i386", "elf32-i386-freebsd", |
3622 | "elf_i386") | |
14bfc3f5 ILT |
3623 | { } |
3624 | ||
3625 | Target* | |
e96caa79 ILT |
3626 | do_instantiate_target() |
3627 | { return new Target_i386(); } | |
14bfc3f5 ILT |
3628 | }; |
3629 | ||
14bfc3f5 ILT |
3630 | Target_selector_i386 target_selector_i386; |
3631 | ||
3632 | } // End anonymous namespace. |