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14bfc3f5 ILT |
1 | // i386.cc -- i386 target support for gold. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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" |
7e1edb90 | 28 | #include "parameters.h" |
92e059d8 | 29 | #include "reloc.h" |
61ba1cf9 ILT |
30 | #include "i386.h" |
31 | #include "object.h" | |
ead1e424 | 32 | #include "symtab.h" |
92e059d8 ILT |
33 | #include "layout.h" |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
14bfc3f5 | 36 | #include "target.h" |
61ba1cf9 | 37 | #include "target-reloc.h" |
14bfc3f5 | 38 | #include "target-select.h" |
af6359d5 | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
14bfc3f5 ILT |
42 | |
43 | namespace | |
44 | { | |
45 | ||
46 | using namespace gold; | |
47 | ||
a3ad94ed ILT |
48 | class Output_data_plt_i386; |
49 | ||
14bfc3f5 | 50 | // The i386 target class. |
e041f13d ILT |
51 | // TLS info comes from |
52 | // http://people.redhat.com/drepper/tls.pdf | |
53 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt | |
14bfc3f5 | 54 | |
36959681 | 55 | class Target_i386 : public Target_freebsd<32, false> |
14bfc3f5 ILT |
56 | { |
57 | public: | |
5a6f7e2d ILT |
58 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; |
59 | ||
14bfc3f5 | 60 | Target_i386() |
36959681 | 61 | : Target_freebsd<32, false>(&i386_info), |
5a6f7e2d | 62 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), |
12c0daef | 63 | copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL), |
edfbb029 | 64 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
14bfc3f5 | 65 | { } |
75f65a3e | 66 | |
6d03d481 ST |
67 | // Process the relocations to determine unreferenced sections for |
68 | // garbage collection. | |
69 | void | |
70 | gc_process_relocs(const General_options& options, | |
71 | Symbol_table* symtab, | |
72 | Layout* layout, | |
73 | Sized_relobj<32, false>* object, | |
74 | unsigned int data_shndx, | |
75 | unsigned int sh_type, | |
76 | const unsigned char* prelocs, | |
77 | size_t reloc_count, | |
78 | Output_section* output_section, | |
79 | bool needs_special_offset_handling, | |
80 | size_t local_symbol_count, | |
81 | const unsigned char* plocal_symbols); | |
82 | ||
92e059d8 | 83 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 84 | void |
92e059d8 ILT |
85 | scan_relocs(const General_options& options, |
86 | Symbol_table* symtab, | |
ead1e424 | 87 | Layout* layout, |
f6ce93d6 | 88 | Sized_relobj<32, false>* object, |
a3ad94ed | 89 | unsigned int data_shndx, |
92e059d8 ILT |
90 | unsigned int sh_type, |
91 | const unsigned char* prelocs, | |
92 | size_t reloc_count, | |
730cdc88 ILT |
93 | Output_section* output_section, |
94 | bool needs_special_offset_handling, | |
92e059d8 | 95 | size_t local_symbol_count, |
730cdc88 | 96 | const unsigned char* plocal_symbols); |
61ba1cf9 | 97 | |
5a6f7e2d ILT |
98 | // Finalize the sections. |
99 | void | |
7e1edb90 | 100 | do_finalize_sections(Layout*); |
5a6f7e2d | 101 | |
ab5c9e90 ILT |
102 | // Return the value to use for a dynamic which requires special |
103 | // treatment. | |
104 | uint64_t | |
105 | do_dynsym_value(const Symbol*) const; | |
106 | ||
92e059d8 ILT |
107 | // Relocate a section. |
108 | void | |
109 | relocate_section(const Relocate_info<32, false>*, | |
110 | unsigned int sh_type, | |
111 | const unsigned char* prelocs, | |
112 | size_t reloc_count, | |
730cdc88 ILT |
113 | Output_section* output_section, |
114 | bool needs_special_offset_handling, | |
92e059d8 ILT |
115 | unsigned char* view, |
116 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
117 | section_size_type view_size, |
118 | const Reloc_symbol_changes*); | |
92e059d8 | 119 | |
6a74a719 ILT |
120 | // Scan the relocs during a relocatable link. |
121 | void | |
122 | scan_relocatable_relocs(const General_options& options, | |
123 | Symbol_table* symtab, | |
124 | Layout* layout, | |
125 | Sized_relobj<32, false>* object, | |
126 | unsigned int data_shndx, | |
127 | unsigned int sh_type, | |
128 | const unsigned char* prelocs, | |
129 | size_t reloc_count, | |
130 | Output_section* output_section, | |
131 | bool needs_special_offset_handling, | |
132 | size_t local_symbol_count, | |
133 | const unsigned char* plocal_symbols, | |
134 | Relocatable_relocs*); | |
135 | ||
136 | // Relocate a section during a relocatable link. | |
137 | void | |
138 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
139 | unsigned int sh_type, | |
140 | const unsigned char* prelocs, | |
141 | size_t reloc_count, | |
142 | Output_section* output_section, | |
143 | off_t offset_in_output_section, | |
144 | const Relocatable_relocs*, | |
145 | unsigned char* view, | |
146 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
147 | section_size_type view_size, | |
148 | unsigned char* reloc_view, | |
149 | section_size_type reloc_view_size); | |
150 | ||
c51e6221 ILT |
151 | // Return a string used to fill a code section with nops. |
152 | std::string | |
8851ecca | 153 | do_code_fill(section_size_type length) const; |
c51e6221 | 154 | |
9a2d6984 ILT |
155 | // Return whether SYM is defined by the ABI. |
156 | bool | |
9c2d0ef9 | 157 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
158 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
159 | ||
bb04269c DK |
160 | // Return whether a symbol name implies a local label. The UnixWare |
161 | // 2.1 cc generates temporary symbols that start with .X, so we | |
162 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
163 | // If so, we should move the .X recognition into | |
164 | // Target::do_is_local_label_name. | |
165 | bool | |
166 | do_is_local_label_name(const char* name) const | |
167 | { | |
168 | if (name[0] == '.' && name[1] == 'X') | |
169 | return true; | |
170 | return Target::do_is_local_label_name(name); | |
171 | } | |
172 | ||
364c7fa5 ILT |
173 | // Adjust -fstack-split code which calls non-stack-split code. |
174 | void | |
175 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
176 | section_offset_type fnoffset, section_size_type fnsize, | |
177 | unsigned char* view, section_size_type view_size, | |
178 | std::string* from, std::string* to) const; | |
179 | ||
96f2030e | 180 | // Return the size of the GOT section. |
fe8718a4 | 181 | section_size_type |
96f2030e ILT |
182 | got_size() |
183 | { | |
184 | gold_assert(this->got_ != NULL); | |
185 | return this->got_->data_size(); | |
186 | } | |
187 | ||
92e059d8 ILT |
188 | private: |
189 | // The class which scans relocations. | |
190 | struct Scan | |
61ba1cf9 ILT |
191 | { |
192 | inline void | |
ead1e424 ILT |
193 | local(const General_options& options, Symbol_table* symtab, |
194 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 195 | Sized_relobj<32, false>* object, |
a3ad94ed | 196 | unsigned int data_shndx, |
07f397ab | 197 | Output_section* output_section, |
92e059d8 ILT |
198 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
199 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 200 | |
92e059d8 | 201 | inline void |
ead1e424 ILT |
202 | global(const General_options& options, Symbol_table* symtab, |
203 | Layout* layout, Target_i386* target, | |
f6ce93d6 | 204 | Sized_relobj<32, false>* object, |
a3ad94ed | 205 | unsigned int data_shndx, |
07f397ab | 206 | Output_section* output_section, |
92e059d8 ILT |
207 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
208 | Symbol* gsym); | |
af6359d5 ILT |
209 | |
210 | static void | |
211 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
212 | ||
213 | static void | |
214 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
215 | Symbol*); | |
61ba1cf9 ILT |
216 | }; |
217 | ||
92e059d8 ILT |
218 | // The class which implements relocation. |
219 | class Relocate | |
220 | { | |
221 | public: | |
ead1e424 | 222 | Relocate() |
46cf9fa2 | 223 | : skip_call_tls_get_addr_(false), |
e8a9fcda | 224 | local_dynamic_type_(LOCAL_DYNAMIC_NONE), ldo_addrs_() |
ead1e424 ILT |
225 | { } |
226 | ||
227 | ~Relocate() | |
228 | { | |
229 | if (this->skip_call_tls_get_addr_) | |
230 | { | |
231 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 232 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
233 | } |
234 | } | |
235 | ||
86849f1f ILT |
236 | // Return whether the static relocation needs to be applied. |
237 | inline bool | |
238 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 239 | int ref_flags, |
031cdbed ILT |
240 | bool is_32bit, |
241 | Output_section* output_section); | |
86849f1f | 242 | |
ead1e424 ILT |
243 | // Do a relocation. Return false if the caller should not issue |
244 | // any warnings about this relocation. | |
245 | inline bool | |
031cdbed ILT |
246 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
247 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 248 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 249 | const Symbol_value<32>*, |
92e059d8 | 250 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 251 | section_size_type); |
92e059d8 ILT |
252 | |
253 | private: | |
254 | // Do a TLS relocation. | |
ead1e424 | 255 | inline void |
07f397ab ILT |
256 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
257 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 258 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 259 | const Symbol_value<32>*, |
fe8718a4 ILT |
260 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
261 | section_size_type); | |
92e059d8 | 262 | |
07f397ab ILT |
263 | // Do a TLS General-Dynamic to Initial-Exec transition. |
264 | inline void | |
265 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
266 | Output_segment* tls_segment, | |
267 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
268 | elfcpp::Elf_types<32>::Elf_Addr value, | |
269 | unsigned char* view, | |
fe8718a4 | 270 | section_size_type view_size); |
07f397ab | 271 | |
56622147 ILT |
272 | // Do a TLS General-Dynamic to Local-Exec transition. |
273 | inline void | |
274 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
275 | Output_segment* tls_segment, |
276 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
277 | elfcpp::Elf_types<32>::Elf_Addr value, | |
278 | unsigned char* view, | |
fe8718a4 | 279 | section_size_type view_size); |
92e059d8 | 280 | |
c2b45e22 CC |
281 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
282 | // transition. | |
283 | inline void | |
284 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
285 | Output_segment* tls_segment, | |
286 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
287 | elfcpp::Elf_types<32>::Elf_Addr value, | |
288 | unsigned char* view, | |
289 | section_size_type view_size); | |
290 | ||
291 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
292 | // transition. | |
293 | inline void | |
294 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
295 | Output_segment* tls_segment, | |
296 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
297 | elfcpp::Elf_types<32>::Elf_Addr value, | |
298 | unsigned char* view, | |
299 | section_size_type view_size); | |
300 | ||
56622147 | 301 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 302 | inline void |
56622147 | 303 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
304 | Output_segment* tls_segment, |
305 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
306 | elfcpp::Elf_types<32>::Elf_Addr value, | |
307 | unsigned char* view, | |
fe8718a4 | 308 | section_size_type view_size); |
ead1e424 | 309 | |
56622147 ILT |
310 | // Do a TLS Initial-Exec to Local-Exec transition. |
311 | static inline void | |
312 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
313 | Output_segment* tls_segment, |
314 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
315 | elfcpp::Elf_types<32>::Elf_Addr value, | |
316 | unsigned char* view, | |
fe8718a4 | 317 | section_size_type view_size); |
46cf9fa2 | 318 | |
e8a9fcda ILT |
319 | // Fix up LDO_32 relocations we've already seen. |
320 | void | |
321 | fix_up_ldo(const Relocate_info<32, false>*); | |
322 | ||
46cf9fa2 ILT |
323 | // We need to keep track of which type of local dynamic relocation |
324 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
325 | enum Local_dynamic_type | |
326 | { | |
327 | LOCAL_DYNAMIC_NONE, | |
328 | LOCAL_DYNAMIC_SUN, | |
329 | LOCAL_DYNAMIC_GNU | |
330 | }; | |
331 | ||
ead1e424 ILT |
332 | // This is set if we should skip the next reloc, which should be a |
333 | // PLT32 reloc against ___tls_get_addr. | |
334 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
335 | // The type of local dynamic relocation we have seen in the section |
336 | // being relocated, if any. | |
337 | Local_dynamic_type local_dynamic_type_; | |
e8a9fcda ILT |
338 | // A list of LDO_32 offsets, in case we find LDM after LDO_32. |
339 | std::vector<unsigned char*> ldo_addrs_; | |
92e059d8 ILT |
340 | }; |
341 | ||
6a74a719 ILT |
342 | // A class which returns the size required for a relocation type, |
343 | // used while scanning relocs during a relocatable link. | |
344 | class Relocatable_size_for_reloc | |
345 | { | |
346 | public: | |
347 | unsigned int | |
348 | get_size_for_reloc(unsigned int, Relobj*); | |
349 | }; | |
350 | ||
92e059d8 ILT |
351 | // Adjust TLS relocation type based on the options and whether this |
352 | // is a local symbol. | |
af6359d5 | 353 | static tls::Tls_optimization |
7e1edb90 | 354 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 355 | |
ead1e424 | 356 | // Get the GOT section, creating it if necessary. |
dbe717ef | 357 | Output_data_got<32, false>* |
7e1edb90 | 358 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 359 | |
96f2030e ILT |
360 | // Get the GOT PLT section. |
361 | Output_data_space* | |
362 | got_plt_section() const | |
363 | { | |
364 | gold_assert(this->got_plt_ != NULL); | |
365 | return this->got_plt_; | |
366 | } | |
367 | ||
a3ad94ed ILT |
368 | // Create a PLT entry for a global symbol. |
369 | void | |
7e1edb90 | 370 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 371 | |
9fa33bee | 372 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
373 | void |
374 | define_tls_base_symbol(Symbol_table*, Layout*); | |
375 | ||
94c4710f ILT |
376 | // Create a GOT entry for the TLS module index. |
377 | unsigned int | |
378 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
379 | Sized_relobj<32, false>* object); | |
380 | ||
a3ad94ed | 381 | // Get the PLT section. |
7bb3655e | 382 | const Output_data_plt_i386* |
a3ad94ed ILT |
383 | plt_section() const |
384 | { | |
385 | gold_assert(this->plt_ != NULL); | |
386 | return this->plt_; | |
387 | } | |
388 | ||
5a6f7e2d ILT |
389 | // Get the dynamic reloc section, creating it if necessary. |
390 | Reloc_section* | |
391 | rel_dyn_section(Layout*); | |
392 | ||
12c0daef | 393 | // Add a potential copy relocation. |
a3ad94ed | 394 | void |
ef9beddf ILT |
395 | copy_reloc(Symbol_table* symtab, Layout* layout, |
396 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
397 | unsigned int shndx, Output_section* output_section, |
398 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
399 | { | |
400 | this->copy_relocs_.copy_reloc(symtab, layout, | |
401 | symtab->get_sized_symbol<32>(sym), | |
402 | object, shndx, output_section, reloc, | |
403 | this->rel_dyn_section(layout)); | |
404 | } | |
ead1e424 | 405 | |
92e059d8 ILT |
406 | // Information about this specific target which we pass to the |
407 | // general Target structure. | |
75f65a3e | 408 | static const Target::Target_info i386_info; |
ead1e424 | 409 | |
0a65a3a7 CC |
410 | // The types of GOT entries needed for this platform. |
411 | enum Got_type | |
412 | { | |
413 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
414 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
415 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
416 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
417 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
418 | }; |
419 | ||
ead1e424 | 420 | // The GOT section. |
dbe717ef | 421 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
422 | // The PLT section. |
423 | Output_data_plt_i386* plt_; | |
424 | // The GOT PLT section. | |
425 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
426 | // The dynamic reloc section. |
427 | Reloc_section* rel_dyn_; | |
428 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 429 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
430 | // Space for variables copied with a COPY reloc. |
431 | Output_data_space* dynbss_; | |
c2b45e22 | 432 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 433 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
434 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
435 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
436 | }; |
437 | ||
438 | const Target::Target_info Target_i386::i386_info = | |
439 | { | |
61ba1cf9 ILT |
440 | 32, // size |
441 | false, // is_big_endian | |
442 | elfcpp::EM_386, // machine_code | |
443 | false, // has_make_symbol | |
dbe717ef | 444 | false, // has_resolve |
c51e6221 | 445 | true, // has_code_fill |
35cdfc9a | 446 | true, // is_default_stack_executable |
0864d551 | 447 | '\0', // wrap_char |
dbe717ef | 448 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 449 | 0x08048000, // default_text_segment_address |
cd72c291 | 450 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
451 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
452 | elfcpp::SHN_UNDEF, // small_common_shndx | |
453 | elfcpp::SHN_UNDEF, // large_common_shndx | |
454 | 0, // small_common_section_flags | |
455 | 0 // large_common_section_flags | |
14bfc3f5 ILT |
456 | }; |
457 | ||
ead1e424 ILT |
458 | // Get the GOT section, creating it if necessary. |
459 | ||
dbe717ef | 460 | Output_data_got<32, false>* |
7e1edb90 | 461 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
462 | { |
463 | if (this->got_ == NULL) | |
464 | { | |
7e1edb90 | 465 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 466 | |
7e1edb90 | 467 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 468 | |
9f1d377b ILT |
469 | Output_section* os; |
470 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
471 | (elfcpp::SHF_ALLOC | |
472 | | elfcpp::SHF_WRITE), | |
473 | this->got_); | |
474 | os->set_is_relro(); | |
ead1e424 | 475 | |
a3ad94ed ILT |
476 | // The old GNU linker creates a .got.plt section. We just |
477 | // create another set of data in the .got section. Note that we | |
478 | // always create a PLT if we create a GOT, although the PLT | |
479 | // might be empty. | |
7d9e3d98 | 480 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
9f1d377b ILT |
481 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
482 | (elfcpp::SHF_ALLOC | |
483 | | elfcpp::SHF_WRITE), | |
484 | this->got_plt_); | |
485 | os->set_is_relro(); | |
a3ad94ed | 486 | |
ead1e424 | 487 | // The first three entries are reserved. |
27bc2bce | 488 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 489 | |
a3ad94ed | 490 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 491 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
a3ad94ed | 492 | this->got_plt_, |
ead1e424 | 493 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 494 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
495 | elfcpp::STV_HIDDEN, 0, |
496 | false, false); | |
497 | } | |
a3ad94ed | 498 | |
ead1e424 ILT |
499 | return this->got_; |
500 | } | |
501 | ||
5a6f7e2d ILT |
502 | // Get the dynamic reloc section, creating it if necessary. |
503 | ||
504 | Target_i386::Reloc_section* | |
505 | Target_i386::rel_dyn_section(Layout* layout) | |
506 | { | |
507 | if (this->rel_dyn_ == NULL) | |
508 | { | |
509 | gold_assert(layout != NULL); | |
d98bc257 | 510 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d ILT |
511 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
512 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
513 | } | |
514 | return this->rel_dyn_; | |
515 | } | |
516 | ||
a3ad94ed ILT |
517 | // A class to handle the PLT data. |
518 | ||
519 | class Output_data_plt_i386 : public Output_section_data | |
520 | { | |
521 | public: | |
522 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
523 | ||
7e1edb90 | 524 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
525 | |
526 | // Add an entry to the PLT. | |
527 | void | |
528 | add_entry(Symbol* gsym); | |
529 | ||
16649710 ILT |
530 | // Return the .rel.plt section data. |
531 | const Reloc_section* | |
532 | rel_plt() const | |
533 | { return this->rel_; } | |
534 | ||
535 | protected: | |
536 | void | |
537 | do_adjust_output_section(Output_section* os); | |
538 | ||
7d9e3d98 ILT |
539 | // Write to a map file. |
540 | void | |
541 | do_print_to_mapfile(Mapfile* mapfile) const | |
542 | { mapfile->print_output_data(this, _("** PLT")); } | |
543 | ||
a3ad94ed ILT |
544 | private: |
545 | // The size of an entry in the PLT. | |
546 | static const int plt_entry_size = 16; | |
547 | ||
548 | // The first entry in the PLT for an executable. | |
549 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
550 | ||
551 | // The first entry in the PLT for a shared object. | |
552 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
553 | ||
554 | // Other entries in the PLT for an executable. | |
555 | static unsigned char exec_plt_entry[plt_entry_size]; | |
556 | ||
557 | // Other entries in the PLT for a shared object. | |
558 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
559 | ||
560 | // Set the final size. | |
561 | void | |
27bc2bce | 562 | set_final_data_size() |
a3ad94ed ILT |
563 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
564 | ||
565 | // Write out the PLT data. | |
566 | void | |
567 | do_write(Output_file*); | |
568 | ||
569 | // The reloc section. | |
570 | Reloc_section* rel_; | |
571 | // The .got.plt section. | |
572 | Output_data_space* got_plt_; | |
573 | // The number of PLT entries. | |
574 | unsigned int count_; | |
a3ad94ed ILT |
575 | }; |
576 | ||
577 | // Create the PLT section. The ordinary .got section is an argument, | |
578 | // since we need to refer to the start. We also create our own .got | |
579 | // section just for PLT entries. | |
580 | ||
581 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 582 | Output_data_space* got_plt) |
80576242 | 583 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed | 584 | { |
d98bc257 | 585 | this->rel_ = new Reloc_section(false); |
a3ad94ed ILT |
586 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
587 | elfcpp::SHF_ALLOC, this->rel_); | |
588 | } | |
589 | ||
16649710 ILT |
590 | void |
591 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
592 | { | |
593 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
594 | // linker, and so do we. | |
595 | os->set_entsize(4); | |
596 | } | |
597 | ||
a3ad94ed ILT |
598 | // Add an entry to the PLT. |
599 | ||
600 | void | |
601 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
602 | { | |
603 | gold_assert(!gsym->has_plt_offset()); | |
604 | ||
605 | // Note that when setting the PLT offset we skip the initial | |
606 | // reserved PLT entry. | |
607 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
608 | ||
609 | ++this->count_; | |
610 | ||
fe8718a4 | 611 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
612 | |
613 | // Every PLT entry needs a GOT entry which points back to the PLT | |
614 | // entry (this will be changed by the dynamic linker, normally | |
615 | // lazily when the function is called). | |
27bc2bce | 616 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
617 | |
618 | // Every PLT entry needs a reloc. | |
16649710 | 619 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
620 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
621 | got_offset); | |
622 | ||
623 | // Note that we don't need to save the symbol. The contents of the | |
624 | // PLT are independent of which symbols are used. The symbols only | |
625 | // appear in the relocations. | |
626 | } | |
627 | ||
628 | // The first entry in the PLT for an executable. | |
629 | ||
630 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
631 | { | |
632 | 0xff, 0x35, // pushl contents of memory address | |
633 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
634 | 0xff, 0x25, // jmp indirect | |
635 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
636 | 0, 0, 0, 0 // unused | |
637 | }; | |
638 | ||
639 | // The first entry in the PLT for a shared object. | |
640 | ||
641 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
642 | { | |
643 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
644 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
645 | 0, 0, 0, 0 // unused | |
646 | }; | |
647 | ||
648 | // Subsequent entries in the PLT for an executable. | |
649 | ||
650 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
651 | { | |
652 | 0xff, 0x25, // jmp indirect | |
653 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
654 | 0x68, // pushl immediate | |
655 | 0, 0, 0, 0, // replaced with offset into relocation table | |
656 | 0xe9, // jmp relative | |
657 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
658 | }; | |
659 | ||
660 | // Subsequent entries in the PLT for a shared object. | |
661 | ||
662 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
663 | { | |
664 | 0xff, 0xa3, // jmp *offset(%ebx) | |
665 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
666 | 0x68, // pushl immediate | |
667 | 0, 0, 0, 0, // replaced with offset into relocation table | |
668 | 0xe9, // jmp relative | |
669 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
670 | }; | |
671 | ||
672 | // Write out the PLT. This uses the hand-coded instructions above, | |
673 | // and adjusts them as needed. This is all specified by the i386 ELF | |
674 | // Processor Supplement. | |
675 | ||
676 | void | |
677 | Output_data_plt_i386::do_write(Output_file* of) | |
678 | { | |
679 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
680 | const section_size_type oview_size = |
681 | convert_to_section_size_type(this->data_size()); | |
a3ad94ed ILT |
682 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
683 | ||
684 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
685 | const section_size_type got_size = |
686 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
687 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
688 | got_size); | |
689 | ||
690 | unsigned char* pov = oview; | |
691 | ||
692 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
693 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
694 | ||
374ad285 | 695 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
696 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
697 | else | |
698 | { | |
699 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
700 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
701 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
702 | } | |
703 | pov += plt_entry_size; | |
704 | ||
705 | unsigned char* got_pov = got_view; | |
706 | ||
707 | memset(got_pov, 0, 12); | |
708 | got_pov += 12; | |
709 | ||
710 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
711 | ||
712 | unsigned int plt_offset = plt_entry_size; | |
713 | unsigned int plt_rel_offset = 0; | |
714 | unsigned int got_offset = 12; | |
715 | const unsigned int count = this->count_; | |
716 | for (unsigned int i = 0; | |
717 | i < count; | |
718 | ++i, | |
719 | pov += plt_entry_size, | |
720 | got_pov += 4, | |
721 | plt_offset += plt_entry_size, | |
722 | plt_rel_offset += rel_size, | |
723 | got_offset += 4) | |
724 | { | |
725 | // Set and adjust the PLT entry itself. | |
726 | ||
374ad285 | 727 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
728 | { |
729 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
730 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
731 | } | |
732 | else | |
733 | { | |
734 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
735 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
736 | (got_address | |
737 | + got_offset)); | |
738 | } | |
739 | ||
740 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
741 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
742 | - (plt_offset + plt_entry_size)); | |
743 | ||
744 | // Set the entry in the GOT. | |
745 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
746 | } | |
747 | ||
fe8718a4 ILT |
748 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
749 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed ILT |
750 | |
751 | of->write_output_view(offset, oview_size, oview); | |
752 | of->write_output_view(got_file_offset, got_size, got_view); | |
753 | } | |
754 | ||
755 | // Create a PLT entry for a global symbol. | |
756 | ||
757 | void | |
7e1edb90 | 758 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
759 | { |
760 | if (gsym->has_plt_offset()) | |
761 | return; | |
762 | ||
763 | if (this->plt_ == NULL) | |
764 | { | |
765 | // Create the GOT sections first. | |
7e1edb90 | 766 | this->got_section(symtab, layout); |
a3ad94ed | 767 | |
7e1edb90 | 768 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
769 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
770 | (elfcpp::SHF_ALLOC | |
771 | | elfcpp::SHF_EXECINSTR), | |
772 | this->plt_); | |
a3ad94ed ILT |
773 | } |
774 | ||
775 | this->plt_->add_entry(gsym); | |
776 | } | |
777 | ||
9fa33bee | 778 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
779 | |
780 | void | |
781 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
782 | { | |
783 | if (this->tls_base_symbol_defined_) | |
784 | return; | |
785 | ||
786 | Output_segment* tls_segment = layout->tls_segment(); | |
787 | if (tls_segment != NULL) | |
788 | { | |
183fd0e3 | 789 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
790 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
791 | tls_segment, 0, 0, | |
792 | elfcpp::STT_TLS, | |
793 | elfcpp::STB_LOCAL, | |
794 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
795 | (is_exec |
796 | ? Symbol::SEGMENT_END | |
797 | : Symbol::SEGMENT_START), | |
798 | true); | |
edfbb029 CC |
799 | } |
800 | this->tls_base_symbol_defined_ = true; | |
801 | } | |
802 | ||
94c4710f ILT |
803 | // Create a GOT entry for the TLS module index. |
804 | ||
805 | unsigned int | |
806 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
807 | Sized_relobj<32, false>* object) | |
808 | { | |
809 | if (this->got_mod_index_offset_ == -1U) | |
810 | { | |
811 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
812 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
813 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
814 | unsigned int got_offset = got->add_constant(0); | |
815 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
816 | got_offset); | |
009a67a2 | 817 | got->add_constant(0); |
94c4710f ILT |
818 | this->got_mod_index_offset_ = got_offset; |
819 | } | |
820 | return this->got_mod_index_offset_; | |
821 | } | |
822 | ||
92e059d8 | 823 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
824 | // symbol. IS_FINAL is true if the final address of this symbol is |
825 | // known at link time. | |
92e059d8 | 826 | |
af6359d5 | 827 | tls::Tls_optimization |
7e1edb90 | 828 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
829 | { |
830 | // If we are generating a shared library, then we can't do anything | |
831 | // in the linker. | |
8851ecca | 832 | if (parameters->options().shared()) |
af6359d5 | 833 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
834 | |
835 | switch (r_type) | |
836 | { | |
837 | case elfcpp::R_386_TLS_GD: | |
838 | case elfcpp::R_386_TLS_GOTDESC: | |
839 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 840 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
841 | // access. Since we know that we are generating an executable, |
842 | // we can convert this to Initial-Exec. If we also know that | |
843 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 844 | if (is_final) |
af6359d5 ILT |
845 | return tls::TLSOPT_TO_LE; |
846 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
847 | |
848 | case elfcpp::R_386_TLS_LDM: | |
849 | // This is Local-Dynamic, which refers to a local symbol in the | |
850 | // dynamic TLS block. Since we know that we generating an | |
851 | // executable, we can switch to Local-Exec. | |
af6359d5 | 852 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
853 | |
854 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
855 | // Another type of Local-Dynamic relocation. |
856 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
857 | |
858 | case elfcpp::R_386_TLS_IE: | |
859 | case elfcpp::R_386_TLS_GOTIE: | |
860 | case elfcpp::R_386_TLS_IE_32: | |
861 | // These are Initial-Exec relocs which get the thread offset | |
862 | // from the GOT. If we know that we are linking against the | |
863 | // local symbol, we can switch to Local-Exec, which links the | |
864 | // thread offset into the instruction. | |
a3ad94ed | 865 | if (is_final) |
af6359d5 ILT |
866 | return tls::TLSOPT_TO_LE; |
867 | return tls::TLSOPT_NONE; | |
8462ae85 | 868 | |
92e059d8 ILT |
869 | case elfcpp::R_386_TLS_LE: |
870 | case elfcpp::R_386_TLS_LE_32: | |
871 | // When we already have Local-Exec, there is nothing further we | |
872 | // can do. | |
af6359d5 | 873 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
874 | |
875 | default: | |
a3ad94ed | 876 | gold_unreachable(); |
92e059d8 ILT |
877 | } |
878 | } | |
879 | ||
af6359d5 ILT |
880 | // Report an unsupported relocation against a local symbol. |
881 | ||
882 | void | |
883 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
884 | unsigned int r_type) | |
885 | { | |
75f2446e ILT |
886 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
887 | object->name().c_str(), r_type); | |
af6359d5 ILT |
888 | } |
889 | ||
92e059d8 ILT |
890 | // Scan a relocation for a local symbol. |
891 | ||
892 | inline void | |
7e1edb90 | 893 | Target_i386::Scan::local(const General_options&, |
ead1e424 ILT |
894 | Symbol_table* symtab, |
895 | Layout* layout, | |
896 | Target_i386* target, | |
f6ce93d6 | 897 | Sized_relobj<32, false>* object, |
1b64748b | 898 | unsigned int data_shndx, |
07f397ab | 899 | Output_section* output_section, |
1b64748b | 900 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 901 | unsigned int r_type, |
7bf1f802 | 902 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
903 | { |
904 | switch (r_type) | |
905 | { | |
906 | case elfcpp::R_386_NONE: | |
907 | case elfcpp::R_386_GNU_VTINHERIT: | |
908 | case elfcpp::R_386_GNU_VTENTRY: | |
909 | break; | |
910 | ||
911 | case elfcpp::R_386_32: | |
436ca963 ILT |
912 | // If building a shared library (or a position-independent |
913 | // executable), we need to create a dynamic relocation for | |
914 | // this location. The relocation applied at link time will | |
915 | // apply the link-time value, so we flag the location with | |
916 | // an R_386_RELATIVE relocation so the dynamic loader can | |
917 | // relocate it easily. | |
8851ecca | 918 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
919 | { |
920 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
921 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
922 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
923 | output_section, data_shndx, | |
924 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
925 | } |
926 | break; | |
927 | ||
928 | case elfcpp::R_386_16: | |
929 | case elfcpp::R_386_8: | |
930 | // If building a shared library (or a position-independent | |
931 | // executable), we need to create a dynamic relocation for | |
932 | // this location. Because the addend needs to remain in the | |
933 | // data section, we need to be careful not to apply this | |
934 | // relocation statically. | |
8851ecca | 935 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
936 | { |
937 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 938 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 939 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
940 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
941 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
942 | else |
943 | { | |
944 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
945 | unsigned int shndx = lsym.get_st_shndx(); |
946 | bool is_ordinary; | |
947 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
948 | &is_ordinary); | |
949 | if (!is_ordinary) | |
950 | object->error(_("section symbol %u has bad shndx %u"), | |
951 | r_sym, shndx); | |
952 | else | |
953 | rel_dyn->add_local_section(object, shndx, | |
954 | r_type, output_section, | |
955 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 956 | } |
436ca963 | 957 | } |
92e059d8 ILT |
958 | break; |
959 | ||
960 | case elfcpp::R_386_PC32: | |
961 | case elfcpp::R_386_PC16: | |
962 | case elfcpp::R_386_PC8: | |
963 | break; | |
964 | ||
df2efe71 ILT |
965 | case elfcpp::R_386_PLT32: |
966 | // Since we know this is a local symbol, we can handle this as a | |
967 | // PC32 reloc. | |
968 | break; | |
969 | ||
ead1e424 ILT |
970 | case elfcpp::R_386_GOTOFF: |
971 | case elfcpp::R_386_GOTPC: | |
972 | // We need a GOT section. | |
7e1edb90 | 973 | target->got_section(symtab, layout); |
ead1e424 ILT |
974 | break; |
975 | ||
1b64748b ILT |
976 | case elfcpp::R_386_GOT32: |
977 | { | |
978 | // The symbol requires a GOT entry. | |
979 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
980 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 981 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
982 | { |
983 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 984 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 985 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
986 | { |
987 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 | 988 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
989 | rel_dyn->add_local_relative( |
990 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
991 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
992 | } |
993 | } | |
994 | } | |
995 | break; | |
996 | ||
af6359d5 ILT |
997 | // These are relocations which should only be seen by the |
998 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
999 | case elfcpp::R_386_COPY: |
1000 | case elfcpp::R_386_GLOB_DAT: | |
1001 | case elfcpp::R_386_JUMP_SLOT: | |
1002 | case elfcpp::R_386_RELATIVE: | |
1003 | case elfcpp::R_386_TLS_TPOFF: | |
1004 | case elfcpp::R_386_TLS_DTPMOD32: | |
1005 | case elfcpp::R_386_TLS_DTPOFF32: | |
1006 | case elfcpp::R_386_TLS_TPOFF32: | |
1007 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1008 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1009 | object->name().c_str(), r_type); |
92e059d8 ILT |
1010 | break; |
1011 | ||
af6359d5 | 1012 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1013 | // linking. |
56622147 ILT |
1014 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1015 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1016 | case elfcpp::R_386_TLS_DESC_CALL: | |
1017 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1018 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1019 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1020 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1021 | case elfcpp::R_386_TLS_GOTIE: |
1022 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1023 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1024 | { |
8851ecca | 1025 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1026 | const tls::Tls_optimization optimized_type |
1027 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1028 | switch (r_type) |
1029 | { | |
56622147 | 1030 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1031 | if (optimized_type == tls::TLSOPT_NONE) |
1032 | { | |
1033 | // Create a pair of GOT entries for the module index and | |
1034 | // dtv-relative offset. | |
1035 | Output_data_got<32, false>* got | |
1036 | = target->got_section(symtab, layout); | |
1037 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1038 | unsigned int shndx = lsym.get_st_shndx(); |
1039 | bool is_ordinary; | |
1040 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1041 | if (!is_ordinary) | |
1042 | object->error(_("local symbol %u has bad shndx %u"), | |
1043 | r_sym, shndx); | |
1044 | else | |
1045 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1046 | GOT_TYPE_TLS_PAIR, | |
1047 | target->rel_dyn_section(layout), | |
1048 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1049 | } |
1050 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1051 | unsupported_reloc_local(object, r_type); | |
1052 | break; | |
1053 | ||
56622147 | 1054 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1055 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1056 | if (optimized_type == tls::TLSOPT_NONE) |
1057 | { | |
1058 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1059 | Output_data_got<32, false>* got | |
1060 | = target->got_section(symtab, layout); | |
1061 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1062 | unsigned int shndx = lsym.get_st_shndx(); |
1063 | bool is_ordinary; | |
1064 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1065 | if (!is_ordinary) | |
1066 | object->error(_("local symbol %u has bad shndx %u"), | |
1067 | r_sym, shndx); | |
1068 | else | |
1069 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1070 | GOT_TYPE_TLS_DESC, | |
1071 | target->rel_dyn_section(layout), | |
1072 | elfcpp::R_386_TLS_DESC, 0); | |
c2b45e22 CC |
1073 | } |
1074 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1075 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1076 | break; |
1077 | ||
c2b45e22 CC |
1078 | case elfcpp::R_386_TLS_DESC_CALL: |
1079 | break; | |
1080 | ||
56622147 | 1081 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1082 | if (optimized_type == tls::TLSOPT_NONE) |
1083 | { | |
1084 | // Create a GOT entry for the module index. | |
94c4710f | 1085 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1086 | } |
1087 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1088 | unsupported_reloc_local(object, r_type); |
1089 | break; | |
1090 | ||
56622147 | 1091 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1092 | break; |
1093 | ||
56622147 ILT |
1094 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1095 | case elfcpp::R_386_TLS_IE_32: | |
1096 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1097 | layout->set_has_static_tls(); |
07f397ab ILT |
1098 | if (optimized_type == tls::TLSOPT_NONE) |
1099 | { | |
7bf1f802 ILT |
1100 | // For the R_386_TLS_IE relocation, we need to create a |
1101 | // dynamic relocation when building a shared library. | |
1102 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1103 | && parameters->options().shared()) |
7bf1f802 ILT |
1104 | { |
1105 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1106 | unsigned int r_sym |
1107 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1108 | rel_dyn->add_local_relative(object, r_sym, | |
1109 | elfcpp::R_386_RELATIVE, | |
1110 | output_section, data_shndx, | |
1111 | reloc.get_r_offset()); | |
7bf1f802 | 1112 | } |
07f397ab ILT |
1113 | // Create a GOT entry for the tp-relative offset. |
1114 | Output_data_got<32, false>* got | |
1115 | = target->got_section(symtab, layout); | |
1116 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1117 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1118 | ? elfcpp::R_386_TLS_TPOFF32 | |
1119 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1120 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1121 | ? GOT_TYPE_TLS_OFFSET | |
1122 | : GOT_TYPE_TLS_NOFFSET); | |
1123 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1124 | target->rel_dyn_section(layout), |
1125 | dyn_r_type); | |
07f397ab ILT |
1126 | } |
1127 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1128 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1129 | break; |
af6359d5 | 1130 | |
56622147 ILT |
1131 | case elfcpp::R_386_TLS_LE: // Local-exec |
1132 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1133 | layout->set_has_static_tls(); |
07f397ab | 1134 | if (output_is_shared) |
7bf1f802 ILT |
1135 | { |
1136 | // We need to create a dynamic relocation. | |
dceae3c1 | 1137 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1138 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1139 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1140 | ? elfcpp::R_386_TLS_TPOFF32 | |
1141 | : elfcpp::R_386_TLS_TPOFF); | |
1142 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1143 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1144 | data_shndx, reloc.get_r_offset()); | |
1145 | } | |
56622147 ILT |
1146 | break; |
1147 | ||
af6359d5 ILT |
1148 | default: |
1149 | gold_unreachable(); | |
7e1edb90 ILT |
1150 | } |
1151 | } | |
92e059d8 ILT |
1152 | break; |
1153 | ||
92e059d8 ILT |
1154 | case elfcpp::R_386_32PLT: |
1155 | case elfcpp::R_386_TLS_GD_32: | |
1156 | case elfcpp::R_386_TLS_GD_PUSH: | |
1157 | case elfcpp::R_386_TLS_GD_CALL: | |
1158 | case elfcpp::R_386_TLS_GD_POP: | |
1159 | case elfcpp::R_386_TLS_LDM_32: | |
1160 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1161 | case elfcpp::R_386_TLS_LDM_CALL: | |
1162 | case elfcpp::R_386_TLS_LDM_POP: | |
1163 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1164 | default: | |
af6359d5 | 1165 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1166 | break; |
1167 | } | |
1168 | } | |
1169 | ||
af6359d5 ILT |
1170 | // Report an unsupported relocation against a global symbol. |
1171 | ||
1172 | void | |
1173 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1174 | unsigned int r_type, | |
1175 | Symbol* gsym) | |
1176 | { | |
75f2446e | 1177 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1178 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1179 | } |
1180 | ||
92e059d8 ILT |
1181 | // Scan a relocation for a global symbol. |
1182 | ||
1183 | inline void | |
12c0daef | 1184 | Target_i386::Scan::global(const General_options&, |
ead1e424 ILT |
1185 | Symbol_table* symtab, |
1186 | Layout* layout, | |
1187 | Target_i386* target, | |
f6ce93d6 | 1188 | Sized_relobj<32, false>* object, |
a3ad94ed | 1189 | unsigned int data_shndx, |
07f397ab | 1190 | Output_section* output_section, |
a3ad94ed ILT |
1191 | const elfcpp::Rel<32, false>& reloc, |
1192 | unsigned int r_type, | |
92e059d8 ILT |
1193 | Symbol* gsym) |
1194 | { | |
1195 | switch (r_type) | |
1196 | { | |
1197 | case elfcpp::R_386_NONE: | |
1198 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1199 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1200 | break; |
1201 | ||
1202 | case elfcpp::R_386_32: | |
92e059d8 | 1203 | case elfcpp::R_386_16: |
92e059d8 | 1204 | case elfcpp::R_386_8: |
96f2030e | 1205 | { |
d61c6bd4 ILT |
1206 | // Make a PLT entry if necessary. |
1207 | if (gsym->needs_plt_entry()) | |
1208 | { | |
1209 | target->make_plt_entry(symtab, layout, gsym); | |
1210 | // Since this is not a PC-relative relocation, we may be | |
1211 | // taking the address of a function. In that case we need to | |
1212 | // set the entry in the dynamic symbol table to the address of | |
1213 | // the PLT entry. | |
8851ecca | 1214 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1215 | gsym->set_needs_dynsym_value(); |
1216 | } | |
1217 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1218 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1219 | { |
966d4097 | 1220 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1221 | { |
12c0daef | 1222 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1223 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1224 | } |
1225 | else if (r_type == elfcpp::R_386_32 | |
1226 | && gsym->can_use_relative_reloc(false)) | |
1227 | { | |
1228 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1229 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1230 | output_section, object, | |
1231 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1232 | } |
1233 | else | |
1234 | { | |
96f2030e | 1235 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1236 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1237 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1238 | } |
1239 | } | |
1240 | } | |
1241 | break; | |
1242 | ||
1243 | case elfcpp::R_386_PC32: | |
1244 | case elfcpp::R_386_PC16: | |
1245 | case elfcpp::R_386_PC8: | |
1246 | { | |
1247 | // Make a PLT entry if necessary. | |
1248 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1249 | { |
1250 | // These relocations are used for function calls only in | |
1251 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1252 | // we'll need a text relocation anyway, so we can skip the | |
1253 | // PLT entry and let the dynamic linker bind the call directly | |
1254 | // to the target. For smaller relocations, we should use a | |
1255 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1256 | if (!parameters->options().shared() |
7bf1f802 ILT |
1257 | || r_type != elfcpp::R_386_PC32) |
1258 | target->make_plt_entry(symtab, layout, gsym); | |
1259 | } | |
d61c6bd4 | 1260 | // Make a dynamic relocation if necessary. |
0700cf32 ILT |
1261 | int flags = Symbol::NON_PIC_REF; |
1262 | if (gsym->type() == elfcpp::STT_FUNC) | |
1263 | flags |= Symbol::FUNCTION_CALL; | |
1264 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1265 | { |
966d4097 | 1266 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1267 | { |
12c0daef | 1268 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1269 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1270 | } |
86849f1f | 1271 | else |
d61c6bd4 ILT |
1272 | { |
1273 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1274 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1275 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1276 | } |
96f2030e ILT |
1277 | } |
1278 | } | |
92e059d8 ILT |
1279 | break; |
1280 | ||
ead1e424 | 1281 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1282 | { |
1283 | // The symbol requires a GOT entry. | |
7e1edb90 | 1284 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1285 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1286 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1287 | else |
1288 | { | |
8462ae85 | 1289 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1290 | // GOT entry with a dynamic relocation. |
1291 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1292 | if (gsym->is_from_dynobj() |
1293 | || gsym->is_undefined() | |
1294 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1295 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1296 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1297 | else |
8462ae85 | 1298 | { |
0a65a3a7 CC |
1299 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1300 | rel_dyn->add_global_relative( | |
1301 | gsym, elfcpp::R_386_RELATIVE, got, | |
1302 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1303 | } |
1304 | } | |
1305 | } | |
ead1e424 ILT |
1306 | break; |
1307 | ||
1308 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1309 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1310 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1311 | if (gsym->final_value_is_known()) |
ead1e424 | 1312 | break; |
436ca963 ILT |
1313 | // If building a shared library, we can also skip the PLT entry |
1314 | // if the symbol is defined in the output file and is protected | |
1315 | // or hidden. | |
1316 | if (gsym->is_defined() | |
1317 | && !gsym->is_from_dynobj() | |
1318 | && !gsym->is_preemptible()) | |
1319 | break; | |
7e1edb90 | 1320 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1321 | break; |
1322 | ||
1323 | case elfcpp::R_386_GOTOFF: | |
1324 | case elfcpp::R_386_GOTPC: | |
1325 | // We need a GOT section. | |
7e1edb90 | 1326 | target->got_section(symtab, layout); |
ead1e424 ILT |
1327 | break; |
1328 | ||
af6359d5 ILT |
1329 | // These are relocations which should only be seen by the |
1330 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1331 | case elfcpp::R_386_COPY: |
1332 | case elfcpp::R_386_GLOB_DAT: | |
1333 | case elfcpp::R_386_JUMP_SLOT: | |
1334 | case elfcpp::R_386_RELATIVE: | |
1335 | case elfcpp::R_386_TLS_TPOFF: | |
1336 | case elfcpp::R_386_TLS_DTPMOD32: | |
1337 | case elfcpp::R_386_TLS_DTPOFF32: | |
1338 | case elfcpp::R_386_TLS_TPOFF32: | |
1339 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1340 | gold_error(_("%s: unexpected reloc %u in object file"), |
1341 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1342 | break; |
1343 | ||
d61c17ea ILT |
1344 | // These are initial tls relocs, which are expected when |
1345 | // linking. | |
56622147 ILT |
1346 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1347 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1348 | case elfcpp::R_386_TLS_DESC_CALL: | |
1349 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1350 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1351 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1352 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1353 | case elfcpp::R_386_TLS_GOTIE: |
1354 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1355 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1356 | { |
7e1edb90 | 1357 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1358 | const tls::Tls_optimization optimized_type |
1359 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1360 | switch (r_type) |
1361 | { | |
56622147 | 1362 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1363 | if (optimized_type == tls::TLSOPT_NONE) |
1364 | { | |
1365 | // Create a pair of GOT entries for the module index and | |
1366 | // dtv-relative offset. | |
1367 | Output_data_got<32, false>* got | |
1368 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1369 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1370 | target->rel_dyn_section(layout), |
1371 | elfcpp::R_386_TLS_DTPMOD32, | |
1372 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1373 | } |
1374 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1375 | { | |
1376 | // Create a GOT entry for the tp-relative offset. | |
1377 | Output_data_got<32, false>* got | |
1378 | = target->got_section(symtab, layout); | |
c2b45e22 | 1379 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1380 | target->rel_dyn_section(layout), |
c2b45e22 | 1381 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1382 | } |
1383 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1384 | unsupported_reloc_global(object, r_type, gsym); | |
1385 | break; | |
1386 | ||
56622147 | 1387 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1388 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1389 | if (optimized_type == tls::TLSOPT_NONE) |
1390 | { | |
1391 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1392 | Output_data_got<32, false>* got | |
1393 | = target->got_section(symtab, layout); | |
1394 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1395 | target->rel_dyn_section(layout), | |
1396 | elfcpp::R_386_TLS_DESC, 0); | |
1397 | } | |
1398 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1399 | { | |
1400 | // Create a GOT entry for the tp-relative offset. | |
1401 | Output_data_got<32, false>* got | |
1402 | = target->got_section(symtab, layout); | |
1403 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1404 | target->rel_dyn_section(layout), | |
1405 | elfcpp::R_386_TLS_TPOFF); | |
1406 | } | |
1407 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1408 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1409 | break; |
1410 | ||
1411 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1412 | break; |
1413 | ||
56622147 | 1414 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1415 | if (optimized_type == tls::TLSOPT_NONE) |
1416 | { | |
1417 | // Create a GOT entry for the module index. | |
94c4710f | 1418 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1419 | } |
1420 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1421 | unsupported_reloc_global(object, r_type, gsym); |
1422 | break; | |
1423 | ||
56622147 | 1424 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1425 | break; |
1426 | ||
56622147 ILT |
1427 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1428 | case elfcpp::R_386_TLS_IE_32: | |
1429 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1430 | layout->set_has_static_tls(); |
07f397ab ILT |
1431 | if (optimized_type == tls::TLSOPT_NONE) |
1432 | { | |
7bf1f802 ILT |
1433 | // For the R_386_TLS_IE relocation, we need to create a |
1434 | // dynamic relocation when building a shared library. | |
1435 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1436 | && parameters->options().shared()) |
07f397ab | 1437 | { |
07f397ab | 1438 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1439 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1440 | output_section, object, | |
1441 | data_shndx, | |
1442 | reloc.get_r_offset()); | |
07f397ab | 1443 | } |
7bf1f802 ILT |
1444 | // Create a GOT entry for the tp-relative offset. |
1445 | Output_data_got<32, false>* got | |
1446 | = target->got_section(symtab, layout); | |
1447 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1448 | ? elfcpp::R_386_TLS_TPOFF32 | |
1449 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1450 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1451 | ? GOT_TYPE_TLS_OFFSET | |
1452 | : GOT_TYPE_TLS_NOFFSET); | |
1453 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1454 | target->rel_dyn_section(layout), |
1455 | dyn_r_type); | |
07f397ab ILT |
1456 | } |
1457 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1458 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1459 | break; |
af6359d5 | 1460 | |
56622147 ILT |
1461 | case elfcpp::R_386_TLS_LE: // Local-exec |
1462 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1463 | layout->set_has_static_tls(); |
8851ecca | 1464 | if (parameters->options().shared()) |
7bf1f802 ILT |
1465 | { |
1466 | // We need to create a dynamic relocation. | |
1467 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1468 | ? elfcpp::R_386_TLS_TPOFF32 | |
1469 | : elfcpp::R_386_TLS_TPOFF); | |
1470 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1471 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1472 | data_shndx, reloc.get_r_offset()); | |
1473 | } | |
56622147 ILT |
1474 | break; |
1475 | ||
af6359d5 ILT |
1476 | default: |
1477 | gold_unreachable(); | |
a3ad94ed ILT |
1478 | } |
1479 | } | |
92e059d8 ILT |
1480 | break; |
1481 | ||
92e059d8 ILT |
1482 | case elfcpp::R_386_32PLT: |
1483 | case elfcpp::R_386_TLS_GD_32: | |
1484 | case elfcpp::R_386_TLS_GD_PUSH: | |
1485 | case elfcpp::R_386_TLS_GD_CALL: | |
1486 | case elfcpp::R_386_TLS_GD_POP: | |
1487 | case elfcpp::R_386_TLS_LDM_32: | |
1488 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1489 | case elfcpp::R_386_TLS_LDM_CALL: | |
1490 | case elfcpp::R_386_TLS_LDM_POP: | |
1491 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1492 | default: | |
af6359d5 | 1493 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1494 | break; |
1495 | } | |
1496 | } | |
1497 | ||
6d03d481 ST |
1498 | // Process relocations for gc. |
1499 | ||
1500 | void | |
1501 | Target_i386::gc_process_relocs(const General_options& options, | |
1502 | Symbol_table* symtab, | |
1503 | Layout* layout, | |
1504 | Sized_relobj<32, false>* object, | |
1505 | unsigned int data_shndx, | |
1506 | unsigned int, | |
1507 | const unsigned char* prelocs, | |
1508 | size_t reloc_count, | |
1509 | Output_section* output_section, | |
1510 | bool needs_special_offset_handling, | |
1511 | size_t local_symbol_count, | |
1512 | const unsigned char* plocal_symbols) | |
1513 | { | |
1514 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
1515 | Target_i386::Scan>( | |
1516 | options, | |
1517 | symtab, | |
1518 | layout, | |
1519 | this, | |
1520 | object, | |
1521 | data_shndx, | |
1522 | prelocs, | |
1523 | reloc_count, | |
1524 | output_section, | |
1525 | needs_special_offset_handling, | |
1526 | local_symbol_count, | |
1527 | plocal_symbols); | |
1528 | } | |
1529 | ||
92e059d8 ILT |
1530 | // Scan relocations for a section. |
1531 | ||
1532 | void | |
1533 | Target_i386::scan_relocs(const General_options& options, | |
1534 | Symbol_table* symtab, | |
ead1e424 | 1535 | Layout* layout, |
f6ce93d6 | 1536 | Sized_relobj<32, false>* object, |
a3ad94ed | 1537 | unsigned int data_shndx, |
92e059d8 ILT |
1538 | unsigned int sh_type, |
1539 | const unsigned char* prelocs, | |
1540 | size_t reloc_count, | |
730cdc88 ILT |
1541 | Output_section* output_section, |
1542 | bool needs_special_offset_handling, | |
92e059d8 | 1543 | size_t local_symbol_count, |
730cdc88 | 1544 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1545 | { |
1546 | if (sh_type == elfcpp::SHT_RELA) | |
1547 | { | |
75f2446e ILT |
1548 | gold_error(_("%s: unsupported RELA reloc section"), |
1549 | object->name().c_str()); | |
1550 | return; | |
92e059d8 ILT |
1551 | } |
1552 | ||
ead1e424 ILT |
1553 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1554 | Target_i386::Scan>( | |
92e059d8 ILT |
1555 | options, |
1556 | symtab, | |
ead1e424 ILT |
1557 | layout, |
1558 | this, | |
92e059d8 | 1559 | object, |
a3ad94ed | 1560 | data_shndx, |
92e059d8 ILT |
1561 | prelocs, |
1562 | reloc_count, | |
730cdc88 ILT |
1563 | output_section, |
1564 | needs_special_offset_handling, | |
92e059d8 | 1565 | local_symbol_count, |
730cdc88 | 1566 | plocal_symbols); |
92e059d8 ILT |
1567 | } |
1568 | ||
16649710 | 1569 | // Finalize the sections. |
5a6f7e2d ILT |
1570 | |
1571 | void | |
7e1edb90 | 1572 | Target_i386::do_finalize_sections(Layout* layout) |
5a6f7e2d | 1573 | { |
16649710 ILT |
1574 | // Fill in some more dynamic tags. |
1575 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1576 | if (odyn != NULL) | |
1577 | { | |
1578 | if (this->got_plt_ != NULL) | |
1579 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1580 | ||
1581 | if (this->plt_ != NULL) | |
1582 | { | |
1583 | const Output_data* od = this->plt_->rel_plt(); | |
1584 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1585 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1586 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1587 | } | |
1588 | ||
1589 | if (this->rel_dyn_ != NULL) | |
1590 | { | |
1591 | const Output_data* od = this->rel_dyn_; | |
1592 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1593 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1594 | odyn->add_constant(elfcpp::DT_RELENT, | |
1595 | elfcpp::Elf_sizes<32>::rel_size); | |
1596 | } | |
1597 | ||
8851ecca | 1598 | if (!parameters->options().shared()) |
16649710 ILT |
1599 | { |
1600 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1601 | // linker at run time, and used by the debugger. | |
1602 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1607 | // relocs. | |
12c0daef ILT |
1608 | if (this->copy_relocs_.any_saved_relocs()) |
1609 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1610 | } |
1611 | ||
86849f1f ILT |
1612 | // Return whether a direct absolute static relocation needs to be applied. |
1613 | // In cases where Scan::local() or Scan::global() has created | |
1614 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1615 | // of the relocation is carried in the data, and we must not | |
1616 | // apply the static relocation. | |
1617 | ||
1618 | inline bool | |
1619 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1620 | int ref_flags, |
031cdbed ILT |
1621 | bool is_32bit, |
1622 | Output_section* output_section) | |
86849f1f | 1623 | { |
031cdbed ILT |
1624 | // If the output section is not allocated, then we didn't call |
1625 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1626 | // the reloc here. | |
1627 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1628 | return true; | |
1629 | ||
d61c6bd4 ILT |
1630 | // For local symbols, we will have created a non-RELATIVE dynamic |
1631 | // relocation only if (a) the output is position independent, | |
1632 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1633 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1634 | if (gsym == NULL) |
8851ecca | 1635 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1636 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1637 | && !is_32bit); |
86849f1f | 1638 | |
0700cf32 ILT |
1639 | // For global symbols, we use the same helper routines used in the |
1640 | // scan pass. If we did not create a dynamic relocation, or if we | |
1641 | // created a RELATIVE dynamic relocation, we should apply the static | |
1642 | // relocation. | |
1643 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1644 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1645 | && gsym->can_use_relative_reloc(ref_flags | |
1646 | & Symbol::FUNCTION_CALL); | |
1647 | return !has_dyn || is_rel; | |
86849f1f ILT |
1648 | } |
1649 | ||
61ba1cf9 ILT |
1650 | // Perform a relocation. |
1651 | ||
ead1e424 | 1652 | inline bool |
92e059d8 | 1653 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1654 | Target_i386* target, |
031cdbed | 1655 | Output_section *output_section, |
92e059d8 ILT |
1656 | size_t relnum, |
1657 | const elfcpp::Rel<32, false>& rel, | |
1658 | unsigned int r_type, | |
c06b7b0b | 1659 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1660 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1661 | unsigned char* view, |
1662 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1663 | section_size_type view_size) |
61ba1cf9 | 1664 | { |
ead1e424 ILT |
1665 | if (this->skip_call_tls_get_addr_) |
1666 | { | |
5efc7cd2 CC |
1667 | if ((r_type != elfcpp::R_386_PLT32 |
1668 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1669 | || gsym == NULL |
1670 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1671 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1672 | _("missing expected TLS relocation")); | |
1673 | else | |
ead1e424 | 1674 | { |
75f2446e ILT |
1675 | this->skip_call_tls_get_addr_ = false; |
1676 | return false; | |
ead1e424 | 1677 | } |
ead1e424 ILT |
1678 | } |
1679 | ||
a3ad94ed | 1680 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1681 | Symbol_value<32> symval; |
436ca963 | 1682 | if (gsym != NULL |
de4c45bd ILT |
1683 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1684 | || r_type == elfcpp::R_386_PC16 | |
1685 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1686 | { |
b8e6aad9 ILT |
1687 | symval.set_output_value(target->plt_section()->address() |
1688 | + gsym->plt_offset()); | |
1689 | psymval = &symval; | |
a3ad94ed ILT |
1690 | } |
1691 | ||
b8e6aad9 ILT |
1692 | const Sized_relobj<32, false>* object = relinfo->object; |
1693 | ||
1b64748b | 1694 | // Get the GOT offset if needed. |
96f2030e ILT |
1695 | // The GOT pointer points to the end of the GOT section. |
1696 | // We need to subtract the size of the GOT section to get | |
1697 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1698 | bool have_got_offset = false; |
1699 | unsigned int got_offset = 0; | |
1700 | switch (r_type) | |
1701 | { | |
1702 | case elfcpp::R_386_GOT32: | |
1703 | if (gsym != NULL) | |
1704 | { | |
0a65a3a7 CC |
1705 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1706 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1707 | - target->got_size()); | |
1b64748b ILT |
1708 | } |
1709 | else | |
1710 | { | |
1711 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1712 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1713 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1714 | - target->got_size()); | |
1b64748b ILT |
1715 | } |
1716 | have_got_offset = true; | |
1717 | break; | |
1718 | ||
1719 | default: | |
1720 | break; | |
1721 | } | |
1722 | ||
61ba1cf9 ILT |
1723 | switch (r_type) |
1724 | { | |
1725 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1726 | case elfcpp::R_386_GNU_VTINHERIT: |
1727 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1728 | break; |
1729 | ||
1730 | case elfcpp::R_386_32: | |
031cdbed ILT |
1731 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1732 | output_section)) | |
86849f1f | 1733 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1734 | break; |
1735 | ||
1736 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1737 | { |
0700cf32 ILT |
1738 | int ref_flags = Symbol::NON_PIC_REF; |
1739 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1740 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed | 1741 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1742 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1743 | } | |
92e059d8 ILT |
1744 | break; |
1745 | ||
1746 | case elfcpp::R_386_16: | |
031cdbed ILT |
1747 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1748 | output_section)) | |
86849f1f | 1749 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1750 | break; |
1751 | ||
1752 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1753 | { |
0700cf32 ILT |
1754 | int ref_flags = Symbol::NON_PIC_REF; |
1755 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1756 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed | 1757 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1758 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1759 | } |
61ba1cf9 ILT |
1760 | break; |
1761 | ||
92e059d8 | 1762 | case elfcpp::R_386_8: |
031cdbed ILT |
1763 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1764 | output_section)) | |
86849f1f | 1765 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1766 | break; |
1767 | ||
1768 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1769 | { |
0700cf32 ILT |
1770 | int ref_flags = Symbol::NON_PIC_REF; |
1771 | if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC) | |
1772 | ref_flags |= Symbol::FUNCTION_CALL; | |
031cdbed ILT |
1773 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1774 | output_section)) | |
d09e9154 | 1775 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1776 | } |
92e059d8 ILT |
1777 | break; |
1778 | ||
ead1e424 | 1779 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1780 | gold_assert(gsym == NULL |
1781 | || gsym->has_plt_offset() | |
99f8faca ILT |
1782 | || gsym->final_value_is_known() |
1783 | || (gsym->is_defined() | |
1784 | && !gsym->is_from_dynobj() | |
1785 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1786 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1787 | break; |
1788 | ||
1789 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1790 | gold_assert(have_got_offset); |
1791 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1792 | break; |
1793 | ||
1794 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1795 | { |
1796 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1797 | value = (psymval->value(object, 0) | |
96f2030e | 1798 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1799 | Relocate_functions<32, false>::rel32(view, value); |
1800 | } | |
ead1e424 ILT |
1801 | break; |
1802 | ||
1803 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1804 | { |
1805 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1806 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1807 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1808 | } | |
ead1e424 ILT |
1809 | break; |
1810 | ||
92e059d8 ILT |
1811 | case elfcpp::R_386_COPY: |
1812 | case elfcpp::R_386_GLOB_DAT: | |
1813 | case elfcpp::R_386_JUMP_SLOT: | |
1814 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1815 | // These are outstanding tls relocs, which are unexpected when |
1816 | // linking. | |
92e059d8 ILT |
1817 | case elfcpp::R_386_TLS_TPOFF: |
1818 | case elfcpp::R_386_TLS_DTPMOD32: | |
1819 | case elfcpp::R_386_TLS_DTPOFF32: | |
1820 | case elfcpp::R_386_TLS_TPOFF32: | |
1821 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1822 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1823 | _("unexpected reloc %u in object file"), | |
1824 | r_type); | |
92e059d8 ILT |
1825 | break; |
1826 | ||
d61c17ea ILT |
1827 | // These are initial tls relocs, which are expected when |
1828 | // linking. | |
56622147 ILT |
1829 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1830 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1831 | case elfcpp::R_386_TLS_DESC_CALL: | |
1832 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1833 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1834 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1835 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1836 | case elfcpp::R_386_TLS_GOTIE: |
1837 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1838 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1839 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1840 | view, address, view_size); | |
92e059d8 ILT |
1841 | break; |
1842 | ||
92e059d8 ILT |
1843 | case elfcpp::R_386_32PLT: |
1844 | case elfcpp::R_386_TLS_GD_32: | |
1845 | case elfcpp::R_386_TLS_GD_PUSH: | |
1846 | case elfcpp::R_386_TLS_GD_CALL: | |
1847 | case elfcpp::R_386_TLS_GD_POP: | |
1848 | case elfcpp::R_386_TLS_LDM_32: | |
1849 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1850 | case elfcpp::R_386_TLS_LDM_CALL: | |
1851 | case elfcpp::R_386_TLS_LDM_POP: | |
1852 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1853 | default: |
75f2446e ILT |
1854 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1855 | _("unsupported reloc %u"), | |
1856 | r_type); | |
92e059d8 ILT |
1857 | break; |
1858 | } | |
ead1e424 ILT |
1859 | |
1860 | return true; | |
92e059d8 ILT |
1861 | } |
1862 | ||
1863 | // Perform a TLS relocation. | |
1864 | ||
1865 | inline void | |
1866 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1867 | Target_i386* target, |
92e059d8 ILT |
1868 | size_t relnum, |
1869 | const elfcpp::Rel<32, false>& rel, | |
1870 | unsigned int r_type, | |
c06b7b0b | 1871 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1872 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1873 | unsigned char* view, |
1874 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1875 | section_size_type view_size) |
92e059d8 ILT |
1876 | { |
1877 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1878 | |
07f397ab ILT |
1879 | const Sized_relobj<32, false>* object = relinfo->object; |
1880 | ||
1881 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1882 | |
8851ecca ILT |
1883 | const bool is_final = |
1884 | (gsym == NULL | |
1885 | ? !parameters->options().output_is_position_independent() | |
1886 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1887 | const tls::Tls_optimization optimized_type |
1888 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1889 | switch (r_type) |
1890 | { | |
56622147 | 1891 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1892 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1893 | { |
07f397ab | 1894 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1895 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1896 | rel, r_type, value, view, | |
1897 | view_size); | |
92e059d8 ILT |
1898 | break; |
1899 | } | |
07f397ab ILT |
1900 | else |
1901 | { | |
c2b45e22 CC |
1902 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1903 | ? GOT_TYPE_TLS_NOFFSET | |
1904 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1905 | unsigned int got_offset; |
1906 | if (gsym != NULL) | |
1907 | { | |
c2b45e22 CC |
1908 | gold_assert(gsym->has_got_offset(got_type)); |
1909 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1910 | } |
1911 | else | |
1912 | { | |
1913 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1914 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1915 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1916 | - target->got_size()); |
1917 | } | |
1918 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1919 | { | |
1920 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1921 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1922 | got_offset, view, view_size); | |
07f397ab ILT |
1923 | break; |
1924 | } | |
1925 | else if (optimized_type == tls::TLSOPT_NONE) | |
1926 | { | |
1927 | // Relocate the field with the offset of the pair of GOT | |
1928 | // entries. | |
1929 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1930 | break; | |
1931 | } | |
1932 | } | |
75f2446e ILT |
1933 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1934 | _("unsupported reloc %u"), | |
1935 | r_type); | |
92e059d8 ILT |
1936 | break; |
1937 | ||
56622147 ILT |
1938 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1939 | case elfcpp::R_386_TLS_DESC_CALL: | |
e8a9fcda ILT |
1940 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_NONE) |
1941 | this->fix_up_ldo(relinfo); | |
497897f9 | 1942 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1943 | if (optimized_type == tls::TLSOPT_TO_LE) |
1944 | { | |
1945 | gold_assert(tls_segment != NULL); | |
1946 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1947 | rel, r_type, value, view, | |
1948 | view_size); | |
1949 | break; | |
1950 | } | |
1951 | else | |
1952 | { | |
1953 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1954 | ? GOT_TYPE_TLS_NOFFSET | |
1955 | : GOT_TYPE_TLS_DESC); | |
1956 | unsigned int got_offset; | |
1957 | if (gsym != NULL) | |
1958 | { | |
1959 | gold_assert(gsym->has_got_offset(got_type)); | |
1960 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1961 | } | |
1962 | else | |
1963 | { | |
1964 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1965 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1966 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1967 | - target->got_size()); | |
1968 | } | |
1969 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1970 | { | |
1971 | gold_assert(tls_segment != NULL); | |
1972 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1973 | got_offset, view, view_size); | |
1974 | break; | |
1975 | } | |
1976 | else if (optimized_type == tls::TLSOPT_NONE) | |
1977 | { | |
1978 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1979 | { | |
1980 | // Relocate the field with the offset of the pair of GOT | |
1981 | // entries. | |
1982 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1983 | } | |
1984 | break; | |
1985 | } | |
1986 | } | |
75f2446e ILT |
1987 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1988 | _("unsupported reloc %u"), | |
1989 | r_type); | |
ead1e424 ILT |
1990 | break; |
1991 | ||
56622147 | 1992 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1993 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1994 | { | |
75f2446e ILT |
1995 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1996 | _("both SUN and GNU model " | |
1997 | "TLS relocations")); | |
1998 | break; | |
46cf9fa2 | 1999 | } |
e8a9fcda ILT |
2000 | else if (this->local_dynamic_type_ == LOCAL_DYNAMIC_NONE) |
2001 | this->fix_up_ldo(relinfo); | |
46cf9fa2 | 2002 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
af6359d5 | 2003 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 2004 | { |
07f397ab | 2005 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
2006 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
2007 | value, view, view_size); | |
2008 | break; | |
2009 | } | |
07f397ab ILT |
2010 | else if (optimized_type == tls::TLSOPT_NONE) |
2011 | { | |
2012 | // Relocate the field with the offset of the GOT entry for | |
2013 | // the module index. | |
2014 | unsigned int got_offset; | |
94c4710f ILT |
2015 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2016 | - target->got_size()); | |
07f397ab ILT |
2017 | Relocate_functions<32, false>::rel32(view, got_offset); |
2018 | break; | |
2019 | } | |
75f2446e ILT |
2020 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2021 | _("unsupported reloc %u"), | |
2022 | r_type); | |
46cf9fa2 ILT |
2023 | break; |
2024 | ||
56622147 | 2025 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
2026 | // This reloc can appear in debugging sections, in which case we |
2027 | // won't see the TLS_LDM reloc. The local_dynamic_type field | |
2028 | // tells us this. | |
d6f22b98 | 2029 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2030 | { |
d6f22b98 ILT |
2031 | if (this->local_dynamic_type_ != LOCAL_DYNAMIC_NONE) |
2032 | { | |
2033 | gold_assert(tls_segment != NULL); | |
2034 | value -= tls_segment->memsz(); | |
2035 | } | |
2036 | else | |
2037 | { | |
2038 | // We may see the LDM later. | |
2039 | this->ldo_addrs_.push_back(view); | |
2040 | } | |
e8a9fcda | 2041 | } |
46cf9fa2 ILT |
2042 | Relocate_functions<32, false>::rel32(view, value); |
2043 | break; | |
2044 | ||
56622147 ILT |
2045 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2046 | case elfcpp::R_386_TLS_GOTIE: | |
2047 | case elfcpp::R_386_TLS_IE_32: | |
2048 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2049 | { | |
07f397ab | 2050 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2051 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2052 | rel, r_type, value, view, | |
2053 | view_size); | |
2054 | break; | |
2055 | } | |
07f397ab ILT |
2056 | else if (optimized_type == tls::TLSOPT_NONE) |
2057 | { | |
2058 | // Relocate the field with the offset of the GOT entry for | |
2059 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2060 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2061 | ? GOT_TYPE_TLS_OFFSET | |
2062 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2063 | unsigned int got_offset; |
2064 | if (gsym != NULL) | |
2065 | { | |
c2b45e22 CC |
2066 | gold_assert(gsym->has_got_offset(got_type)); |
2067 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2068 | } |
2069 | else | |
2070 | { | |
2071 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2072 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2073 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2074 | } |
2075 | // For the R_386_TLS_IE relocation, we need to apply the | |
2076 | // absolute address of the GOT entry. | |
2077 | if (r_type == elfcpp::R_386_TLS_IE) | |
2078 | got_offset += target->got_plt_section()->address(); | |
2079 | // All GOT offsets are relative to the end of the GOT. | |
2080 | got_offset -= target->got_size(); | |
2081 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2082 | break; | |
2083 | } | |
75f2446e ILT |
2084 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2085 | _("unsupported reloc %u"), | |
2086 | r_type); | |
92e059d8 | 2087 | break; |
92e059d8 | 2088 | |
56622147 | 2089 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2090 | // If we're creating a shared library, a dynamic relocation will |
2091 | // have been created for this location, so do not apply it now. | |
8851ecca | 2092 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2093 | { |
2094 | gold_assert(tls_segment != NULL); | |
2095 | value -= tls_segment->memsz(); | |
2096 | Relocate_functions<32, false>::rel32(view, value); | |
2097 | } | |
56622147 | 2098 | break; |
92e059d8 | 2099 | |
56622147 | 2100 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2101 | // If we're creating a shared library, a dynamic relocation will |
2102 | // have been created for this location, so do not apply it now. | |
8851ecca | 2103 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2104 | { |
2105 | gold_assert(tls_segment != NULL); | |
2106 | value = tls_segment->memsz() - value; | |
2107 | Relocate_functions<32, false>::rel32(view, value); | |
2108 | } | |
56622147 | 2109 | break; |
92e059d8 | 2110 | } |
92e059d8 ILT |
2111 | } |
2112 | ||
e041f13d | 2113 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2114 | // Local-Exec. |
2115 | ||
2116 | inline void | |
2117 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2118 | size_t relnum, | |
2119 | Output_segment* tls_segment, | |
2120 | const elfcpp::Rel<32, false>& rel, | |
2121 | unsigned int, | |
2122 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2123 | unsigned char* view, | |
fe8718a4 | 2124 | section_size_type view_size) |
ead1e424 ILT |
2125 | { |
2126 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2127 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2128 | // leal foo(%reg),%eax; call ___tls_get_addr |
2129 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2130 | ||
af6359d5 ILT |
2131 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2132 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2133 | |
2134 | unsigned char op1 = view[-1]; | |
2135 | unsigned char op2 = view[-2]; | |
2136 | ||
af6359d5 ILT |
2137 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2138 | op2 == 0x8d || op2 == 0x04); | |
2139 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2140 | |
2141 | int roff = 5; | |
2142 | ||
2143 | if (op2 == 0x04) | |
2144 | { | |
af6359d5 ILT |
2145 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2146 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2147 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2148 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2149 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2150 | } | |
2151 | else | |
2152 | { | |
af6359d5 ILT |
2153 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2154 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2155 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2156 | && view[9] == 0x90) |
ead1e424 ILT |
2157 | { |
2158 | // There is a trailing nop. Use the size byte subl. | |
2159 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2160 | roff = 6; | |
2161 | } | |
2162 | else | |
2163 | { | |
2164 | // Use the five byte subl. | |
2165 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2166 | } | |
2167 | } | |
2168 | ||
7bf1f802 | 2169 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2170 | Relocate_functions<32, false>::rel32(view + roff, value); |
2171 | ||
2172 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2173 | // We can skip it. | |
2174 | this->skip_call_tls_get_addr_ = true; | |
2175 | } | |
2176 | ||
7bf1f802 | 2177 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2178 | // Initial-Exec. |
2179 | ||
2180 | inline void | |
2181 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2182 | size_t relnum, | |
c2b45e22 | 2183 | Output_segment*, |
07f397ab ILT |
2184 | const elfcpp::Rel<32, false>& rel, |
2185 | unsigned int, | |
2186 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2187 | unsigned char* view, | |
fe8718a4 | 2188 | section_size_type view_size) |
07f397ab ILT |
2189 | { |
2190 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2191 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2192 | ||
2193 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2194 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2195 | ||
2196 | unsigned char op1 = view[-1]; | |
2197 | unsigned char op2 = view[-2]; | |
2198 | ||
2199 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2200 | op2 == 0x8d || op2 == 0x04); | |
2201 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2202 | ||
2203 | int roff = 5; | |
2204 | ||
c2b45e22 CC |
2205 | // FIXME: For now, support only the first (SIB) form. |
2206 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2207 | |
2208 | if (op2 == 0x04) | |
2209 | { | |
2210 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2211 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2212 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2213 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2214 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2215 | } | |
2216 | else | |
2217 | { | |
2218 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2219 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2220 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2221 | && view[9] == 0x90) |
2222 | { | |
2223 | // FIXME: This is not the right instruction sequence. | |
2224 | // There is a trailing nop. Use the size byte subl. | |
2225 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2226 | roff = 6; | |
2227 | } | |
2228 | else | |
2229 | { | |
2230 | // FIXME: This is not the right instruction sequence. | |
2231 | // Use the five byte subl. | |
2232 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2233 | } | |
2234 | } | |
2235 | ||
07f397ab ILT |
2236 | Relocate_functions<32, false>::rel32(view + roff, value); |
2237 | ||
2238 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2239 | // We can skip it. | |
2240 | this->skip_call_tls_get_addr_ = true; | |
2241 | } | |
2242 | ||
c2b45e22 CC |
2243 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2244 | // General-Dynamic to a Local-Exec. | |
2245 | ||
2246 | inline void | |
2247 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2248 | const Relocate_info<32, false>* relinfo, | |
2249 | size_t relnum, | |
2250 | Output_segment* tls_segment, | |
2251 | const elfcpp::Rel<32, false>& rel, | |
2252 | unsigned int r_type, | |
2253 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2254 | unsigned char* view, | |
2255 | section_size_type view_size) | |
2256 | { | |
2257 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2258 | { | |
2259 | // leal foo@TLSDESC(%ebx), %eax | |
2260 | // ==> leal foo@NTPOFF, %eax | |
2261 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2262 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2263 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2264 | view[-2] == 0x8d && view[-1] == 0x83); | |
2265 | view[-1] = 0x05; | |
2266 | value -= tls_segment->memsz(); | |
2267 | Relocate_functions<32, false>::rel32(view, value); | |
2268 | } | |
2269 | else | |
2270 | { | |
2271 | // call *foo@TLSCALL(%eax) | |
2272 | // ==> nop; nop | |
2273 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2274 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2275 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2276 | view[0] == 0xff && view[1] == 0x10); | |
2277 | view[0] = 0x66; | |
2278 | view[1] = 0x90; | |
2279 | } | |
2280 | } | |
2281 | ||
2282 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2283 | // General-Dynamic to an Initial-Exec. | |
2284 | ||
2285 | inline void | |
2286 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2287 | const Relocate_info<32, false>* relinfo, | |
2288 | size_t relnum, | |
2289 | Output_segment*, | |
2290 | const elfcpp::Rel<32, false>& rel, | |
2291 | unsigned int r_type, | |
2292 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2293 | unsigned char* view, | |
2294 | section_size_type view_size) | |
2295 | { | |
2296 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2297 | { | |
2298 | // leal foo@TLSDESC(%ebx), %eax | |
2299 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2300 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2301 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2302 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2303 | view[-2] == 0x8d && view[-1] == 0x83); | |
2304 | view[-2] = 0x8b; | |
2305 | Relocate_functions<32, false>::rel32(view, value); | |
2306 | } | |
2307 | else | |
2308 | { | |
2309 | // call *foo@TLSCALL(%eax) | |
2310 | // ==> nop; nop | |
2311 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2312 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2313 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2314 | view[0] == 0xff && view[1] == 0x10); | |
2315 | view[0] = 0x66; | |
2316 | view[1] = 0x90; | |
2317 | } | |
2318 | } | |
2319 | ||
46cf9fa2 ILT |
2320 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2321 | // Local-Exec. | |
2322 | ||
2323 | inline void | |
2324 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2325 | size_t relnum, | |
2326 | Output_segment*, | |
2327 | const elfcpp::Rel<32, false>& rel, | |
2328 | unsigned int, | |
2329 | elfcpp::Elf_types<32>::Elf_Addr, | |
2330 | unsigned char* view, | |
fe8718a4 | 2331 | section_size_type view_size) |
46cf9fa2 ILT |
2332 | { |
2333 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2334 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2335 | ||
af6359d5 ILT |
2336 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2337 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2338 | |
2339 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2340 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2341 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2342 | |
af6359d5 | 2343 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2344 | |
2345 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2346 | ||
2347 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2348 | // We can skip it. | |
2349 | this->skip_call_tls_get_addr_ = true; | |
2350 | } | |
2351 | ||
56622147 ILT |
2352 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2353 | // Local-Exec. | |
2354 | ||
2355 | inline void | |
2356 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2357 | size_t relnum, | |
2358 | Output_segment* tls_segment, | |
2359 | const elfcpp::Rel<32, false>& rel, | |
2360 | unsigned int r_type, | |
2361 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2362 | unsigned char* view, | |
fe8718a4 | 2363 | section_size_type view_size) |
56622147 ILT |
2364 | { |
2365 | // We have to actually change the instructions, which means that we | |
2366 | // need to examine the opcodes to figure out which instruction we | |
2367 | // are looking at. | |
2368 | if (r_type == elfcpp::R_386_TLS_IE) | |
2369 | { | |
2370 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2371 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2372 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2373 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2374 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2375 | ||
2376 | unsigned char op1 = view[-1]; | |
2377 | if (op1 == 0xa1) | |
2378 | { | |
2379 | // movl XX,%eax ==> movl $YY,%eax | |
2380 | view[-1] = 0xb8; | |
2381 | } | |
2382 | else | |
2383 | { | |
2384 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2385 | ||
2386 | unsigned char op2 = view[-2]; | |
2387 | if (op2 == 0x8b) | |
2388 | { | |
2389 | // movl XX,%reg ==> movl $YY,%reg | |
2390 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2391 | (op1 & 0xc7) == 0x05); | |
2392 | view[-2] = 0xc7; | |
2393 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2394 | } | |
2395 | else if (op2 == 0x03) | |
2396 | { | |
2397 | // addl XX,%reg ==> addl $YY,%reg | |
2398 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2399 | (op1 & 0xc7) == 0x05); | |
2400 | view[-2] = 0x81; | |
2401 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2402 | } | |
2403 | else | |
2404 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2405 | } | |
2406 | } | |
2407 | else | |
2408 | { | |
2409 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2410 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2411 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2412 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2413 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2414 | ||
2415 | unsigned char op1 = view[-1]; | |
2416 | unsigned char op2 = view[-2]; | |
2417 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2418 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2419 | if (op2 == 0x8b) | |
2420 | { | |
2421 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2422 | view[-2] = 0xc7; | |
2423 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2424 | } | |
2425 | else if (op2 == 0x2b) | |
2426 | { | |
2427 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2428 | view[-2] = 0x81; | |
2429 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2430 | } | |
2431 | else if (op2 == 0x03) | |
2432 | { | |
2433 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2434 | view[-2] = 0x81; | |
2435 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2436 | } | |
2437 | else | |
2438 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2439 | } | |
2440 | ||
7bf1f802 | 2441 | value = tls_segment->memsz() - value; |
56622147 ILT |
2442 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2443 | value = - value; | |
2444 | ||
2445 | Relocate_functions<32, false>::rel32(view, value); | |
2446 | } | |
2447 | ||
e8a9fcda ILT |
2448 | // If we see an LDM reloc after we handled any LDO_32 relocs, fix up |
2449 | // the LDO_32 relocs. | |
2450 | ||
2451 | void | |
2452 | Target_i386::Relocate::fix_up_ldo(const Relocate_info<32, false>* relinfo) | |
2453 | { | |
2454 | if (this->ldo_addrs_.empty()) | |
2455 | return; | |
2456 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
2457 | gold_assert(tls_segment != NULL); | |
2458 | elfcpp::Elf_types<32>::Elf_Addr value = - tls_segment->memsz(); | |
2459 | for (std::vector<unsigned char*>::const_iterator p = this->ldo_addrs_.begin(); | |
2460 | p != this->ldo_addrs_.end(); | |
2461 | ++p) | |
2462 | Relocate_functions<32, false>::rel32(*p, value); | |
2463 | this->ldo_addrs_.clear(); | |
2464 | } | |
2465 | ||
61ba1cf9 ILT |
2466 | // Relocate section data. |
2467 | ||
2468 | void | |
92e059d8 | 2469 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2470 | unsigned int sh_type, |
2471 | const unsigned char* prelocs, | |
2472 | size_t reloc_count, | |
730cdc88 ILT |
2473 | Output_section* output_section, |
2474 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2475 | unsigned char* view, |
2476 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2477 | section_size_type view_size, |
2478 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2479 | { |
a3ad94ed | 2480 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2481 | |
ead1e424 ILT |
2482 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2483 | Target_i386::Relocate>( | |
92e059d8 | 2484 | relinfo, |
ead1e424 | 2485 | this, |
61ba1cf9 ILT |
2486 | prelocs, |
2487 | reloc_count, | |
730cdc88 ILT |
2488 | output_section, |
2489 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2490 | view, |
2491 | address, | |
364c7fa5 ILT |
2492 | view_size, |
2493 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2494 | } |
2495 | ||
6a74a719 ILT |
2496 | // Return the size of a relocation while scanning during a relocatable |
2497 | // link. | |
2498 | ||
2499 | unsigned int | |
2500 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2501 | unsigned int r_type, | |
2502 | Relobj* object) | |
2503 | { | |
2504 | switch (r_type) | |
2505 | { | |
2506 | case elfcpp::R_386_NONE: | |
2507 | case elfcpp::R_386_GNU_VTINHERIT: | |
2508 | case elfcpp::R_386_GNU_VTENTRY: | |
2509 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2510 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2511 | case elfcpp::R_386_TLS_DESC_CALL: | |
2512 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2513 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2514 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2515 | case elfcpp::R_386_TLS_IE_32: | |
2516 | case elfcpp::R_386_TLS_GOTIE: | |
2517 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2518 | case elfcpp::R_386_TLS_LE_32: | |
2519 | return 0; | |
2520 | ||
2521 | case elfcpp::R_386_32: | |
2522 | case elfcpp::R_386_PC32: | |
2523 | case elfcpp::R_386_GOT32: | |
2524 | case elfcpp::R_386_PLT32: | |
2525 | case elfcpp::R_386_GOTOFF: | |
2526 | case elfcpp::R_386_GOTPC: | |
2527 | return 4; | |
2528 | ||
2529 | case elfcpp::R_386_16: | |
2530 | case elfcpp::R_386_PC16: | |
2531 | return 2; | |
2532 | ||
2533 | case elfcpp::R_386_8: | |
2534 | case elfcpp::R_386_PC8: | |
2535 | return 1; | |
2536 | ||
2537 | // These are relocations which should only be seen by the | |
2538 | // dynamic linker, and should never be seen here. | |
2539 | case elfcpp::R_386_COPY: | |
2540 | case elfcpp::R_386_GLOB_DAT: | |
2541 | case elfcpp::R_386_JUMP_SLOT: | |
2542 | case elfcpp::R_386_RELATIVE: | |
2543 | case elfcpp::R_386_TLS_TPOFF: | |
2544 | case elfcpp::R_386_TLS_DTPMOD32: | |
2545 | case elfcpp::R_386_TLS_DTPOFF32: | |
2546 | case elfcpp::R_386_TLS_TPOFF32: | |
2547 | case elfcpp::R_386_TLS_DESC: | |
2548 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2549 | return 0; | |
2550 | ||
2551 | case elfcpp::R_386_32PLT: | |
2552 | case elfcpp::R_386_TLS_GD_32: | |
2553 | case elfcpp::R_386_TLS_GD_PUSH: | |
2554 | case elfcpp::R_386_TLS_GD_CALL: | |
2555 | case elfcpp::R_386_TLS_GD_POP: | |
2556 | case elfcpp::R_386_TLS_LDM_32: | |
2557 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2558 | case elfcpp::R_386_TLS_LDM_CALL: | |
2559 | case elfcpp::R_386_TLS_LDM_POP: | |
2560 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2561 | default: | |
2562 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2563 | return 0; | |
2564 | } | |
2565 | } | |
2566 | ||
2567 | // Scan the relocs during a relocatable link. | |
2568 | ||
2569 | void | |
2570 | Target_i386::scan_relocatable_relocs(const General_options& options, | |
2571 | Symbol_table* symtab, | |
2572 | Layout* layout, | |
2573 | Sized_relobj<32, false>* object, | |
2574 | unsigned int data_shndx, | |
2575 | unsigned int sh_type, | |
2576 | const unsigned char* prelocs, | |
2577 | size_t reloc_count, | |
2578 | Output_section* output_section, | |
2579 | bool needs_special_offset_handling, | |
2580 | size_t local_symbol_count, | |
2581 | const unsigned char* plocal_symbols, | |
2582 | Relocatable_relocs* rr) | |
2583 | { | |
2584 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2585 | ||
2586 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2587 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2588 | ||
7019cd25 | 2589 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 ILT |
2590 | Scan_relocatable_relocs>( |
2591 | options, | |
2592 | symtab, | |
2593 | layout, | |
2594 | object, | |
2595 | data_shndx, | |
2596 | prelocs, | |
2597 | reloc_count, | |
2598 | output_section, | |
2599 | needs_special_offset_handling, | |
2600 | local_symbol_count, | |
2601 | plocal_symbols, | |
2602 | rr); | |
2603 | } | |
2604 | ||
2605 | // Relocate a section during a relocatable link. | |
2606 | ||
2607 | void | |
2608 | Target_i386::relocate_for_relocatable( | |
2609 | const Relocate_info<32, false>* relinfo, | |
2610 | unsigned int sh_type, | |
2611 | const unsigned char* prelocs, | |
2612 | size_t reloc_count, | |
2613 | Output_section* output_section, | |
2614 | off_t offset_in_output_section, | |
2615 | const Relocatable_relocs* rr, | |
2616 | unsigned char* view, | |
2617 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2618 | section_size_type view_size, | |
2619 | unsigned char* reloc_view, | |
2620 | section_size_type reloc_view_size) | |
2621 | { | |
2622 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2623 | ||
7019cd25 | 2624 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2625 | relinfo, |
2626 | prelocs, | |
2627 | reloc_count, | |
2628 | output_section, | |
2629 | offset_in_output_section, | |
2630 | rr, | |
2631 | view, | |
2632 | view_address, | |
2633 | view_size, | |
2634 | reloc_view, | |
2635 | reloc_view_size); | |
2636 | } | |
2637 | ||
ab5c9e90 ILT |
2638 | // Return the value to use for a dynamic which requires special |
2639 | // treatment. This is how we support equality comparisons of function | |
2640 | // pointers across shared library boundaries, as described in the | |
2641 | // processor specific ABI supplement. | |
2642 | ||
2643 | uint64_t | |
2644 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2645 | { | |
2646 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2647 | return this->plt_section()->address() + gsym->plt_offset(); | |
2648 | } | |
2649 | ||
c51e6221 ILT |
2650 | // Return a string used to fill a code section with nops to take up |
2651 | // the specified length. | |
2652 | ||
2653 | std::string | |
8851ecca | 2654 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2655 | { |
2656 | if (length >= 16) | |
2657 | { | |
2658 | // Build a jmp instruction to skip over the bytes. | |
2659 | unsigned char jmp[5]; | |
2660 | jmp[0] = 0xe9; | |
2661 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2662 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2663 | + std::string(length - 5, '\0')); | |
2664 | } | |
2665 | ||
2666 | // Nop sequences of various lengths. | |
2667 | const char nop1[1] = { 0x90 }; // nop | |
2668 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2669 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2670 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2671 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2672 | 0x00 }; // leal 0(%esi,1),%esi | |
2673 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2674 | 0x00, 0x00 }; | |
2675 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2676 | 0x00, 0x00, 0x00 }; | |
2677 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2678 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2679 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2680 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2681 | 0x00 }; | |
2682 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2683 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2684 | 0x00, 0x00 }; | |
2685 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2686 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2687 | 0x00, 0x00, 0x00 }; | |
2688 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2689 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2690 | 0x00, 0x00, 0x00, 0x00 }; | |
2691 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2692 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2693 | 0x27, 0x00, 0x00, 0x00, | |
2694 | 0x00 }; | |
2695 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2696 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2697 | 0xbc, 0x27, 0x00, 0x00, | |
2698 | 0x00, 0x00 }; | |
2699 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2700 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2701 | 0x90, 0x90, 0x90, 0x90, | |
2702 | 0x90, 0x90, 0x90 }; | |
2703 | ||
2704 | const char* nops[16] = { | |
2705 | NULL, | |
2706 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2707 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2708 | }; | |
2709 | ||
2710 | return std::string(nops[length], length); | |
2711 | } | |
2712 | ||
364c7fa5 ILT |
2713 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2714 | // compiled with -fstack-split. The function calls non-stack-split | |
2715 | // code. We have to change the function so that it always ensures | |
2716 | // that it has enough stack space to run some random function. | |
2717 | ||
2718 | void | |
2719 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2720 | section_offset_type fnoffset, | |
2721 | section_size_type fnsize, | |
2722 | unsigned char* view, | |
2723 | section_size_type view_size, | |
2724 | std::string* from, | |
2725 | std::string* to) const | |
2726 | { | |
2727 | // The function starts with a comparison of the stack pointer and a | |
2728 | // field in the TCB. This is followed by a jump. | |
2729 | ||
2730 | // cmp %gs:NN,%esp | |
2731 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
2732 | && fnsize > 7) | |
2733 | { | |
2734 | // We will call __morestack if the carry flag is set after this | |
2735 | // comparison. We turn the comparison into an stc instruction | |
2736 | // and some nops. | |
2737 | view[fnoffset] = '\xf9'; | |
2738 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
2739 | } | |
2740 | // lea NN(%esp),%ecx | |
2741 | else if (this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
2742 | && fnsize > 7) | |
2743 | { | |
2744 | // This is loading an offset from the stack pointer for a | |
2745 | // comparison. The offset is negative, so we decrease the | |
2746 | // offset by the amount of space we need for the stack. This | |
2747 | // means we will avoid calling __morestack if there happens to | |
2748 | // be plenty of space on the stack already. | |
2749 | unsigned char* pval = view + fnoffset + 3; | |
2750 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2751 | val -= parameters->options().split_stack_adjust_size(); | |
2752 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2753 | } | |
2754 | else | |
2755 | { | |
2756 | if (!object->has_no_split_stack()) | |
2757 | object->error(_("failed to match split-stack sequence at " | |
2758 | "section %u offset %0zx"), | |
2759 | shndx, fnoffset); | |
2760 | return; | |
2761 | } | |
2762 | ||
2763 | // We have to change the function so that it calls | |
2764 | // __morestack_non_split instead of __morestack. The former will | |
2765 | // allocate additional stack space. | |
2766 | *from = "__morestack"; | |
2767 | *to = "__morestack_non_split"; | |
2768 | } | |
2769 | ||
14bfc3f5 ILT |
2770 | // The selector for i386 object files. |
2771 | ||
36959681 | 2772 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
2773 | { |
2774 | public: | |
2775 | Target_selector_i386() | |
36959681 ILT |
2776 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
2777 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
2778 | { } |
2779 | ||
2780 | Target* | |
e96caa79 ILT |
2781 | do_instantiate_target() |
2782 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2783 | }; |
2784 | ||
14bfc3f5 ILT |
2785 | Target_selector_i386 target_selector_i386; |
2786 | ||
2787 | } // End anonymous namespace. |