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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 | |
ad0f2072 | 70 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
71 | Layout* layout, |
72 | Sized_relobj<32, false>* object, | |
73 | unsigned int data_shndx, | |
74 | unsigned int sh_type, | |
75 | const unsigned char* prelocs, | |
76 | size_t reloc_count, | |
77 | Output_section* output_section, | |
78 | bool needs_special_offset_handling, | |
79 | size_t local_symbol_count, | |
80 | const unsigned char* plocal_symbols); | |
81 | ||
92e059d8 | 82 | // Scan the relocations to look for symbol adjustments. |
61ba1cf9 | 83 | void |
ad0f2072 | 84 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 85 | Layout* layout, |
f6ce93d6 | 86 | Sized_relobj<32, false>* object, |
a3ad94ed | 87 | unsigned int data_shndx, |
92e059d8 ILT |
88 | unsigned int sh_type, |
89 | const unsigned char* prelocs, | |
90 | size_t reloc_count, | |
730cdc88 ILT |
91 | Output_section* output_section, |
92 | bool needs_special_offset_handling, | |
92e059d8 | 93 | size_t local_symbol_count, |
730cdc88 | 94 | const unsigned char* plocal_symbols); |
61ba1cf9 | 95 | |
5a6f7e2d ILT |
96 | // Finalize the sections. |
97 | void | |
f59f41f3 | 98 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
5a6f7e2d | 99 | |
ab5c9e90 ILT |
100 | // Return the value to use for a dynamic which requires special |
101 | // treatment. | |
102 | uint64_t | |
103 | do_dynsym_value(const Symbol*) const; | |
104 | ||
92e059d8 ILT |
105 | // Relocate a section. |
106 | void | |
107 | relocate_section(const Relocate_info<32, false>*, | |
108 | unsigned int sh_type, | |
109 | const unsigned char* prelocs, | |
110 | size_t reloc_count, | |
730cdc88 ILT |
111 | Output_section* output_section, |
112 | bool needs_special_offset_handling, | |
92e059d8 ILT |
113 | unsigned char* view, |
114 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
115 | section_size_type view_size, |
116 | const Reloc_symbol_changes*); | |
92e059d8 | 117 | |
6a74a719 ILT |
118 | // Scan the relocs during a relocatable link. |
119 | void | |
ad0f2072 | 120 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
121 | Layout* layout, |
122 | Sized_relobj<32, false>* object, | |
123 | unsigned int data_shndx, | |
124 | unsigned int sh_type, | |
125 | const unsigned char* prelocs, | |
126 | size_t reloc_count, | |
127 | Output_section* output_section, | |
128 | bool needs_special_offset_handling, | |
129 | size_t local_symbol_count, | |
130 | const unsigned char* plocal_symbols, | |
131 | Relocatable_relocs*); | |
132 | ||
133 | // Relocate a section during a relocatable link. | |
134 | void | |
135 | relocate_for_relocatable(const Relocate_info<32, false>*, | |
136 | unsigned int sh_type, | |
137 | const unsigned char* prelocs, | |
138 | size_t reloc_count, | |
139 | Output_section* output_section, | |
140 | off_t offset_in_output_section, | |
141 | const Relocatable_relocs*, | |
142 | unsigned char* view, | |
143 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
144 | section_size_type view_size, | |
145 | unsigned char* reloc_view, | |
146 | section_size_type reloc_view_size); | |
147 | ||
c51e6221 ILT |
148 | // Return a string used to fill a code section with nops. |
149 | std::string | |
8851ecca | 150 | do_code_fill(section_size_type length) const; |
c51e6221 | 151 | |
9a2d6984 ILT |
152 | // Return whether SYM is defined by the ABI. |
153 | bool | |
9c2d0ef9 | 154 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
155 | { return strcmp(sym->name(), "___tls_get_addr") == 0; } |
156 | ||
bb04269c DK |
157 | // Return whether a symbol name implies a local label. The UnixWare |
158 | // 2.1 cc generates temporary symbols that start with .X, so we | |
159 | // recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
160 | // If so, we should move the .X recognition into | |
161 | // Target::do_is_local_label_name. | |
162 | bool | |
163 | do_is_local_label_name(const char* name) const | |
164 | { | |
165 | if (name[0] == '.' && name[1] == 'X') | |
166 | return true; | |
167 | return Target::do_is_local_label_name(name); | |
168 | } | |
169 | ||
364c7fa5 ILT |
170 | // Adjust -fstack-split code which calls non-stack-split code. |
171 | void | |
172 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
173 | section_offset_type fnoffset, section_size_type fnsize, | |
174 | unsigned char* view, section_size_type view_size, | |
175 | std::string* from, std::string* to) const; | |
176 | ||
96f2030e | 177 | // Return the size of the GOT section. |
fe8718a4 | 178 | section_size_type |
96f2030e ILT |
179 | got_size() |
180 | { | |
181 | gold_assert(this->got_ != NULL); | |
182 | return this->got_->data_size(); | |
183 | } | |
184 | ||
92e059d8 ILT |
185 | private: |
186 | // The class which scans relocations. | |
187 | struct Scan | |
61ba1cf9 ILT |
188 | { |
189 | inline void | |
ad0f2072 | 190 | local(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 191 | Sized_relobj<32, false>* object, |
a3ad94ed | 192 | unsigned int data_shndx, |
07f397ab | 193 | Output_section* output_section, |
92e059d8 ILT |
194 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
195 | const elfcpp::Sym<32, false>& lsym); | |
61ba1cf9 | 196 | |
92e059d8 | 197 | inline void |
ad0f2072 | 198 | global(Symbol_table* symtab, Layout* layout, Target_i386* target, |
f6ce93d6 | 199 | Sized_relobj<32, false>* object, |
a3ad94ed | 200 | unsigned int data_shndx, |
07f397ab | 201 | Output_section* output_section, |
92e059d8 ILT |
202 | const elfcpp::Rel<32, false>& reloc, unsigned int r_type, |
203 | Symbol* gsym); | |
af6359d5 ILT |
204 | |
205 | static void | |
206 | unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type); | |
207 | ||
208 | static void | |
209 | unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type, | |
210 | Symbol*); | |
61ba1cf9 ILT |
211 | }; |
212 | ||
92e059d8 ILT |
213 | // The class which implements relocation. |
214 | class Relocate | |
215 | { | |
216 | public: | |
ead1e424 | 217 | Relocate() |
46cf9fa2 | 218 | : skip_call_tls_get_addr_(false), |
82bb573a | 219 | local_dynamic_type_(LOCAL_DYNAMIC_NONE) |
ead1e424 ILT |
220 | { } |
221 | ||
222 | ~Relocate() | |
223 | { | |
224 | if (this->skip_call_tls_get_addr_) | |
225 | { | |
226 | // FIXME: This needs to specify the location somehow. | |
75f2446e | 227 | gold_error(_("missing expected TLS relocation")); |
ead1e424 ILT |
228 | } |
229 | } | |
230 | ||
86849f1f ILT |
231 | // Return whether the static relocation needs to be applied. |
232 | inline bool | |
233 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 234 | int ref_flags, |
031cdbed ILT |
235 | bool is_32bit, |
236 | Output_section* output_section); | |
86849f1f | 237 | |
ead1e424 ILT |
238 | // Do a relocation. Return false if the caller should not issue |
239 | // any warnings about this relocation. | |
240 | inline bool | |
031cdbed ILT |
241 | relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*, |
242 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 243 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 244 | const Symbol_value<32>*, |
92e059d8 | 245 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
fe8718a4 | 246 | section_size_type); |
92e059d8 ILT |
247 | |
248 | private: | |
249 | // Do a TLS relocation. | |
ead1e424 | 250 | inline void |
07f397ab ILT |
251 | relocate_tls(const Relocate_info<32, false>*, Target_i386* target, |
252 | size_t relnum, const elfcpp::Rel<32, false>&, | |
c06b7b0b | 253 | unsigned int r_type, const Sized_symbol<32>*, |
b8e6aad9 | 254 | const Symbol_value<32>*, |
fe8718a4 ILT |
255 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, |
256 | section_size_type); | |
92e059d8 | 257 | |
07f397ab ILT |
258 | // Do a TLS General-Dynamic to Initial-Exec transition. |
259 | inline void | |
260 | tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
261 | Output_segment* tls_segment, | |
262 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
263 | elfcpp::Elf_types<32>::Elf_Addr value, | |
264 | unsigned char* view, | |
fe8718a4 | 265 | section_size_type view_size); |
07f397ab | 266 | |
56622147 ILT |
267 | // Do a TLS General-Dynamic to Local-Exec transition. |
268 | inline void | |
269 | tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
92e059d8 ILT |
270 | Output_segment* tls_segment, |
271 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
272 | elfcpp::Elf_types<32>::Elf_Addr value, | |
273 | unsigned char* view, | |
fe8718a4 | 274 | section_size_type view_size); |
92e059d8 | 275 | |
c2b45e22 CC |
276 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec |
277 | // transition. | |
278 | inline void | |
279 | tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum, | |
280 | Output_segment* tls_segment, | |
281 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
282 | elfcpp::Elf_types<32>::Elf_Addr value, | |
283 | unsigned char* view, | |
284 | section_size_type view_size); | |
285 | ||
286 | // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec | |
287 | // transition. | |
288 | inline void | |
289 | tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum, | |
290 | Output_segment* tls_segment, | |
291 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
292 | elfcpp::Elf_types<32>::Elf_Addr value, | |
293 | unsigned char* view, | |
294 | section_size_type view_size); | |
295 | ||
56622147 | 296 | // Do a TLS Local-Dynamic to Local-Exec transition. |
ead1e424 | 297 | inline void |
56622147 | 298 | tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum, |
ead1e424 ILT |
299 | Output_segment* tls_segment, |
300 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
301 | elfcpp::Elf_types<32>::Elf_Addr value, | |
302 | unsigned char* view, | |
fe8718a4 | 303 | section_size_type view_size); |
ead1e424 | 304 | |
56622147 ILT |
305 | // Do a TLS Initial-Exec to Local-Exec transition. |
306 | static inline void | |
307 | tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum, | |
46cf9fa2 ILT |
308 | Output_segment* tls_segment, |
309 | const elfcpp::Rel<32, false>&, unsigned int r_type, | |
310 | elfcpp::Elf_types<32>::Elf_Addr value, | |
311 | unsigned char* view, | |
fe8718a4 | 312 | section_size_type view_size); |
46cf9fa2 | 313 | |
46cf9fa2 ILT |
314 | // We need to keep track of which type of local dynamic relocation |
315 | // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly. | |
316 | enum Local_dynamic_type | |
317 | { | |
318 | LOCAL_DYNAMIC_NONE, | |
319 | LOCAL_DYNAMIC_SUN, | |
320 | LOCAL_DYNAMIC_GNU | |
321 | }; | |
322 | ||
ead1e424 ILT |
323 | // This is set if we should skip the next reloc, which should be a |
324 | // PLT32 reloc against ___tls_get_addr. | |
325 | bool skip_call_tls_get_addr_; | |
46cf9fa2 ILT |
326 | // The type of local dynamic relocation we have seen in the section |
327 | // being relocated, if any. | |
328 | Local_dynamic_type local_dynamic_type_; | |
92e059d8 ILT |
329 | }; |
330 | ||
6a74a719 ILT |
331 | // A class which returns the size required for a relocation type, |
332 | // used while scanning relocs during a relocatable link. | |
333 | class Relocatable_size_for_reloc | |
334 | { | |
335 | public: | |
336 | unsigned int | |
337 | get_size_for_reloc(unsigned int, Relobj*); | |
338 | }; | |
339 | ||
92e059d8 ILT |
340 | // Adjust TLS relocation type based on the options and whether this |
341 | // is a local symbol. | |
af6359d5 | 342 | static tls::Tls_optimization |
7e1edb90 | 343 | optimize_tls_reloc(bool is_final, int r_type); |
92e059d8 | 344 | |
ead1e424 | 345 | // Get the GOT section, creating it if necessary. |
dbe717ef | 346 | Output_data_got<32, false>* |
7e1edb90 | 347 | got_section(Symbol_table*, Layout*); |
a3ad94ed | 348 | |
96f2030e ILT |
349 | // Get the GOT PLT section. |
350 | Output_data_space* | |
351 | got_plt_section() const | |
352 | { | |
353 | gold_assert(this->got_plt_ != NULL); | |
354 | return this->got_plt_; | |
355 | } | |
356 | ||
a3ad94ed ILT |
357 | // Create a PLT entry for a global symbol. |
358 | void | |
7e1edb90 | 359 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
a3ad94ed | 360 | |
9fa33bee | 361 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
362 | void |
363 | define_tls_base_symbol(Symbol_table*, Layout*); | |
364 | ||
94c4710f ILT |
365 | // Create a GOT entry for the TLS module index. |
366 | unsigned int | |
367 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
368 | Sized_relobj<32, false>* object); | |
369 | ||
a3ad94ed | 370 | // Get the PLT section. |
7bb3655e | 371 | const Output_data_plt_i386* |
a3ad94ed ILT |
372 | plt_section() const |
373 | { | |
374 | gold_assert(this->plt_ != NULL); | |
375 | return this->plt_; | |
376 | } | |
377 | ||
5a6f7e2d ILT |
378 | // Get the dynamic reloc section, creating it if necessary. |
379 | Reloc_section* | |
380 | rel_dyn_section(Layout*); | |
381 | ||
12c0daef | 382 | // Add a potential copy relocation. |
a3ad94ed | 383 | void |
ef9beddf ILT |
384 | copy_reloc(Symbol_table* symtab, Layout* layout, |
385 | Sized_relobj<32, false>* object, | |
12c0daef ILT |
386 | unsigned int shndx, Output_section* output_section, |
387 | Symbol* sym, const elfcpp::Rel<32, false>& reloc) | |
388 | { | |
389 | this->copy_relocs_.copy_reloc(symtab, layout, | |
390 | symtab->get_sized_symbol<32>(sym), | |
391 | object, shndx, output_section, reloc, | |
392 | this->rel_dyn_section(layout)); | |
393 | } | |
ead1e424 | 394 | |
92e059d8 ILT |
395 | // Information about this specific target which we pass to the |
396 | // general Target structure. | |
75f65a3e | 397 | static const Target::Target_info i386_info; |
ead1e424 | 398 | |
0a65a3a7 CC |
399 | // The types of GOT entries needed for this platform. |
400 | enum Got_type | |
401 | { | |
402 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
c2b45e22 CC |
403 | GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset |
404 | GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset | |
405 | GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair | |
406 | GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair | |
0a65a3a7 CC |
407 | }; |
408 | ||
ead1e424 | 409 | // The GOT section. |
dbe717ef | 410 | Output_data_got<32, false>* got_; |
a3ad94ed ILT |
411 | // The PLT section. |
412 | Output_data_plt_i386* plt_; | |
413 | // The GOT PLT section. | |
414 | Output_data_space* got_plt_; | |
5a6f7e2d ILT |
415 | // The dynamic reloc section. |
416 | Reloc_section* rel_dyn_; | |
417 | // Relocs saved to avoid a COPY reloc. | |
12c0daef | 418 | Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_; |
5a6f7e2d ILT |
419 | // Space for variables copied with a COPY reloc. |
420 | Output_data_space* dynbss_; | |
c2b45e22 | 421 | // Offset of the GOT entry for the TLS module index. |
94c4710f | 422 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
423 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
424 | bool tls_base_symbol_defined_; | |
75f65a3e ILT |
425 | }; |
426 | ||
427 | const Target::Target_info Target_i386::i386_info = | |
428 | { | |
61ba1cf9 ILT |
429 | 32, // size |
430 | false, // is_big_endian | |
431 | elfcpp::EM_386, // machine_code | |
432 | false, // has_make_symbol | |
dbe717ef | 433 | false, // has_resolve |
c51e6221 | 434 | true, // has_code_fill |
35cdfc9a | 435 | true, // is_default_stack_executable |
0864d551 | 436 | '\0', // wrap_char |
dbe717ef | 437 | "/usr/lib/libc.so.1", // dynamic_linker |
0c5e9c22 | 438 | 0x08048000, // default_text_segment_address |
cd72c291 | 439 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
440 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
441 | elfcpp::SHN_UNDEF, // small_common_shndx | |
442 | elfcpp::SHN_UNDEF, // large_common_shndx | |
443 | 0, // small_common_section_flags | |
05a352e6 DK |
444 | 0, // large_common_section_flags |
445 | NULL, // attributes_section | |
446 | NULL // attributes_vendor | |
14bfc3f5 ILT |
447 | }; |
448 | ||
ead1e424 ILT |
449 | // Get the GOT section, creating it if necessary. |
450 | ||
dbe717ef | 451 | Output_data_got<32, false>* |
7e1edb90 | 452 | Target_i386::got_section(Symbol_table* symtab, Layout* layout) |
ead1e424 ILT |
453 | { |
454 | if (this->got_ == NULL) | |
455 | { | |
7e1edb90 | 456 | gold_assert(symtab != NULL && layout != NULL); |
a3ad94ed | 457 | |
7e1edb90 | 458 | this->got_ = new Output_data_got<32, false>(); |
ead1e424 | 459 | |
9f1d377b ILT |
460 | Output_section* os; |
461 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
462 | (elfcpp::SHF_ALLOC | |
463 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
464 | this->got_, false, true, true, |
465 | false); | |
ead1e424 | 466 | |
7d9e3d98 | 467 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
1a2dff53 | 468 | os = layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
9f1d377b ILT |
469 | (elfcpp::SHF_ALLOC |
470 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
471 | this->got_plt_, false, false, false, |
472 | true); | |
a3ad94ed | 473 | |
ead1e424 | 474 | // The first three entries are reserved. |
27bc2bce | 475 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 476 | |
1a2dff53 ILT |
477 | // Those bytes can go into the relro segment. |
478 | layout->increase_relro(3 * 4); | |
479 | ||
a3ad94ed | 480 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 481 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
99fff23b | 482 | Symbol_table::PREDEFINED, |
a3ad94ed | 483 | this->got_plt_, |
ead1e424 | 484 | 0, 0, elfcpp::STT_OBJECT, |
16649710 | 485 | elfcpp::STB_LOCAL, |
ead1e424 ILT |
486 | elfcpp::STV_HIDDEN, 0, |
487 | false, false); | |
488 | } | |
a3ad94ed | 489 | |
ead1e424 ILT |
490 | return this->got_; |
491 | } | |
492 | ||
5a6f7e2d ILT |
493 | // Get the dynamic reloc section, creating it if necessary. |
494 | ||
495 | Target_i386::Reloc_section* | |
496 | Target_i386::rel_dyn_section(Layout* layout) | |
497 | { | |
498 | if (this->rel_dyn_ == NULL) | |
499 | { | |
500 | gold_assert(layout != NULL); | |
d98bc257 | 501 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
5a6f7e2d | 502 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
1a2dff53 ILT |
503 | elfcpp::SHF_ALLOC, this->rel_dyn_, true, |
504 | false, false, false); | |
5a6f7e2d ILT |
505 | } |
506 | return this->rel_dyn_; | |
507 | } | |
508 | ||
a3ad94ed ILT |
509 | // A class to handle the PLT data. |
510 | ||
511 | class Output_data_plt_i386 : public Output_section_data | |
512 | { | |
513 | public: | |
514 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
515 | ||
7e1edb90 | 516 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
517 | |
518 | // Add an entry to the PLT. | |
519 | void | |
520 | add_entry(Symbol* gsym); | |
521 | ||
16649710 ILT |
522 | // Return the .rel.plt section data. |
523 | const Reloc_section* | |
524 | rel_plt() const | |
525 | { return this->rel_; } | |
526 | ||
527 | protected: | |
528 | void | |
529 | do_adjust_output_section(Output_section* os); | |
530 | ||
7d9e3d98 ILT |
531 | // Write to a map file. |
532 | void | |
533 | do_print_to_mapfile(Mapfile* mapfile) const | |
534 | { mapfile->print_output_data(this, _("** PLT")); } | |
535 | ||
a3ad94ed ILT |
536 | private: |
537 | // The size of an entry in the PLT. | |
538 | static const int plt_entry_size = 16; | |
539 | ||
540 | // The first entry in the PLT for an executable. | |
541 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
542 | ||
543 | // The first entry in the PLT for a shared object. | |
544 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
545 | ||
546 | // Other entries in the PLT for an executable. | |
547 | static unsigned char exec_plt_entry[plt_entry_size]; | |
548 | ||
549 | // Other entries in the PLT for a shared object. | |
550 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
551 | ||
552 | // Set the final size. | |
553 | void | |
27bc2bce | 554 | set_final_data_size() |
a3ad94ed ILT |
555 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
556 | ||
557 | // Write out the PLT data. | |
558 | void | |
559 | do_write(Output_file*); | |
560 | ||
561 | // The reloc section. | |
562 | Reloc_section* rel_; | |
563 | // The .got.plt section. | |
564 | Output_data_space* got_plt_; | |
565 | // The number of PLT entries. | |
566 | unsigned int count_; | |
a3ad94ed ILT |
567 | }; |
568 | ||
569 | // Create the PLT section. The ordinary .got section is an argument, | |
570 | // since we need to refer to the start. We also create our own .got | |
571 | // section just for PLT entries. | |
572 | ||
573 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 574 | Output_data_space* got_plt) |
80576242 | 575 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed | 576 | { |
d98bc257 | 577 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 578 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
1a2dff53 ILT |
579 | elfcpp::SHF_ALLOC, this->rel_, true, |
580 | false, false, false); | |
a3ad94ed ILT |
581 | } |
582 | ||
16649710 ILT |
583 | void |
584 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
585 | { | |
586 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
587 | // linker, and so do we. | |
588 | os->set_entsize(4); | |
589 | } | |
590 | ||
a3ad94ed ILT |
591 | // Add an entry to the PLT. |
592 | ||
593 | void | |
594 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
595 | { | |
596 | gold_assert(!gsym->has_plt_offset()); | |
597 | ||
598 | // Note that when setting the PLT offset we skip the initial | |
599 | // reserved PLT entry. | |
600 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
601 | ||
602 | ++this->count_; | |
603 | ||
fe8718a4 | 604 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
605 | |
606 | // Every PLT entry needs a GOT entry which points back to the PLT | |
607 | // entry (this will be changed by the dynamic linker, normally | |
608 | // lazily when the function is called). | |
27bc2bce | 609 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
610 | |
611 | // Every PLT entry needs a reloc. | |
16649710 | 612 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
613 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
614 | got_offset); | |
615 | ||
616 | // Note that we don't need to save the symbol. The contents of the | |
617 | // PLT are independent of which symbols are used. The symbols only | |
618 | // appear in the relocations. | |
619 | } | |
620 | ||
621 | // The first entry in the PLT for an executable. | |
622 | ||
623 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
624 | { | |
625 | 0xff, 0x35, // pushl contents of memory address | |
626 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
627 | 0xff, 0x25, // jmp indirect | |
628 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
629 | 0, 0, 0, 0 // unused | |
630 | }; | |
631 | ||
632 | // The first entry in the PLT for a shared object. | |
633 | ||
634 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
635 | { | |
636 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
637 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
638 | 0, 0, 0, 0 // unused | |
639 | }; | |
640 | ||
641 | // Subsequent entries in the PLT for an executable. | |
642 | ||
643 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
644 | { | |
645 | 0xff, 0x25, // jmp indirect | |
646 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
647 | 0x68, // pushl immediate | |
648 | 0, 0, 0, 0, // replaced with offset into relocation table | |
649 | 0xe9, // jmp relative | |
650 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
651 | }; | |
652 | ||
653 | // Subsequent entries in the PLT for a shared object. | |
654 | ||
655 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
656 | { | |
657 | 0xff, 0xa3, // jmp *offset(%ebx) | |
658 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
659 | 0x68, // pushl immediate | |
660 | 0, 0, 0, 0, // replaced with offset into relocation table | |
661 | 0xe9, // jmp relative | |
662 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
663 | }; | |
664 | ||
665 | // Write out the PLT. This uses the hand-coded instructions above, | |
666 | // and adjusts them as needed. This is all specified by the i386 ELF | |
667 | // Processor Supplement. | |
668 | ||
669 | void | |
670 | Output_data_plt_i386::do_write(Output_file* of) | |
671 | { | |
2ea97941 | 672 | const off_t offset = this->offset(); |
fe8718a4 ILT |
673 | const section_size_type oview_size = |
674 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 675 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
a3ad94ed ILT |
676 | |
677 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
678 | const section_size_type got_size = |
679 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
680 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
681 | got_size); | |
682 | ||
683 | unsigned char* pov = oview; | |
684 | ||
685 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
686 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
687 | ||
374ad285 | 688 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
689 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
690 | else | |
691 | { | |
692 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
693 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
694 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
695 | } | |
696 | pov += plt_entry_size; | |
697 | ||
698 | unsigned char* got_pov = got_view; | |
699 | ||
700 | memset(got_pov, 0, 12); | |
701 | got_pov += 12; | |
702 | ||
703 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
704 | ||
705 | unsigned int plt_offset = plt_entry_size; | |
706 | unsigned int plt_rel_offset = 0; | |
707 | unsigned int got_offset = 12; | |
708 | const unsigned int count = this->count_; | |
709 | for (unsigned int i = 0; | |
710 | i < count; | |
711 | ++i, | |
712 | pov += plt_entry_size, | |
713 | got_pov += 4, | |
714 | plt_offset += plt_entry_size, | |
715 | plt_rel_offset += rel_size, | |
716 | got_offset += 4) | |
717 | { | |
718 | // Set and adjust the PLT entry itself. | |
719 | ||
374ad285 | 720 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
721 | { |
722 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
723 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
724 | } | |
725 | else | |
726 | { | |
727 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
728 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
729 | (got_address | |
730 | + got_offset)); | |
731 | } | |
732 | ||
733 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
734 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
735 | - (plt_offset + plt_entry_size)); | |
736 | ||
737 | // Set the entry in the GOT. | |
738 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
739 | } | |
740 | ||
fe8718a4 ILT |
741 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
742 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 743 | |
2ea97941 | 744 | of->write_output_view(offset, oview_size, oview); |
a3ad94ed ILT |
745 | of->write_output_view(got_file_offset, got_size, got_view); |
746 | } | |
747 | ||
748 | // Create a PLT entry for a global symbol. | |
749 | ||
750 | void | |
7e1edb90 | 751 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
752 | { |
753 | if (gsym->has_plt_offset()) | |
754 | return; | |
755 | ||
756 | if (this->plt_ == NULL) | |
757 | { | |
758 | // Create the GOT sections first. | |
7e1edb90 | 759 | this->got_section(symtab, layout); |
a3ad94ed | 760 | |
7e1edb90 | 761 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
762 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
763 | (elfcpp::SHF_ALLOC | |
764 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 765 | this->plt_, false, false, false, false); |
a3ad94ed ILT |
766 | } |
767 | ||
768 | this->plt_->add_entry(gsym); | |
769 | } | |
770 | ||
9fa33bee | 771 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
772 | |
773 | void | |
774 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
775 | { | |
776 | if (this->tls_base_symbol_defined_) | |
777 | return; | |
778 | ||
779 | Output_segment* tls_segment = layout->tls_segment(); | |
780 | if (tls_segment != NULL) | |
781 | { | |
183fd0e3 | 782 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 783 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 784 | Symbol_table::PREDEFINED, |
edfbb029 CC |
785 | tls_segment, 0, 0, |
786 | elfcpp::STT_TLS, | |
787 | elfcpp::STB_LOCAL, | |
788 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
789 | (is_exec |
790 | ? Symbol::SEGMENT_END | |
791 | : Symbol::SEGMENT_START), | |
792 | true); | |
edfbb029 CC |
793 | } |
794 | this->tls_base_symbol_defined_ = true; | |
795 | } | |
796 | ||
94c4710f ILT |
797 | // Create a GOT entry for the TLS module index. |
798 | ||
799 | unsigned int | |
800 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
801 | Sized_relobj<32, false>* object) | |
802 | { | |
803 | if (this->got_mod_index_offset_ == -1U) | |
804 | { | |
805 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
806 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
807 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
808 | unsigned int got_offset = got->add_constant(0); | |
809 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
810 | got_offset); | |
009a67a2 | 811 | got->add_constant(0); |
94c4710f ILT |
812 | this->got_mod_index_offset_ = got_offset; |
813 | } | |
814 | return this->got_mod_index_offset_; | |
815 | } | |
816 | ||
92e059d8 | 817 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
818 | // symbol. IS_FINAL is true if the final address of this symbol is |
819 | // known at link time. | |
92e059d8 | 820 | |
af6359d5 | 821 | tls::Tls_optimization |
7e1edb90 | 822 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
823 | { |
824 | // If we are generating a shared library, then we can't do anything | |
825 | // in the linker. | |
8851ecca | 826 | if (parameters->options().shared()) |
af6359d5 | 827 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
828 | |
829 | switch (r_type) | |
830 | { | |
831 | case elfcpp::R_386_TLS_GD: | |
832 | case elfcpp::R_386_TLS_GOTDESC: | |
833 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 834 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
835 | // access. Since we know that we are generating an executable, |
836 | // we can convert this to Initial-Exec. If we also know that | |
837 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 838 | if (is_final) |
af6359d5 ILT |
839 | return tls::TLSOPT_TO_LE; |
840 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
841 | |
842 | case elfcpp::R_386_TLS_LDM: | |
843 | // This is Local-Dynamic, which refers to a local symbol in the | |
844 | // dynamic TLS block. Since we know that we generating an | |
845 | // executable, we can switch to Local-Exec. | |
af6359d5 | 846 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
847 | |
848 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
849 | // Another type of Local-Dynamic relocation. |
850 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
851 | |
852 | case elfcpp::R_386_TLS_IE: | |
853 | case elfcpp::R_386_TLS_GOTIE: | |
854 | case elfcpp::R_386_TLS_IE_32: | |
855 | // These are Initial-Exec relocs which get the thread offset | |
856 | // from the GOT. If we know that we are linking against the | |
857 | // local symbol, we can switch to Local-Exec, which links the | |
858 | // thread offset into the instruction. | |
a3ad94ed | 859 | if (is_final) |
af6359d5 ILT |
860 | return tls::TLSOPT_TO_LE; |
861 | return tls::TLSOPT_NONE; | |
8462ae85 | 862 | |
92e059d8 ILT |
863 | case elfcpp::R_386_TLS_LE: |
864 | case elfcpp::R_386_TLS_LE_32: | |
865 | // When we already have Local-Exec, there is nothing further we | |
866 | // can do. | |
af6359d5 | 867 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
868 | |
869 | default: | |
a3ad94ed | 870 | gold_unreachable(); |
92e059d8 ILT |
871 | } |
872 | } | |
873 | ||
af6359d5 ILT |
874 | // Report an unsupported relocation against a local symbol. |
875 | ||
876 | void | |
877 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
878 | unsigned int r_type) | |
879 | { | |
75f2446e ILT |
880 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
881 | object->name().c_str(), r_type); | |
af6359d5 ILT |
882 | } |
883 | ||
92e059d8 ILT |
884 | // Scan a relocation for a local symbol. |
885 | ||
886 | inline void | |
ad0f2072 | 887 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
888 | Layout* layout, |
889 | Target_i386* target, | |
f6ce93d6 | 890 | Sized_relobj<32, false>* object, |
1b64748b | 891 | unsigned int data_shndx, |
07f397ab | 892 | Output_section* output_section, |
1b64748b | 893 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 894 | unsigned int r_type, |
7bf1f802 | 895 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
896 | { |
897 | switch (r_type) | |
898 | { | |
899 | case elfcpp::R_386_NONE: | |
900 | case elfcpp::R_386_GNU_VTINHERIT: | |
901 | case elfcpp::R_386_GNU_VTENTRY: | |
902 | break; | |
903 | ||
904 | case elfcpp::R_386_32: | |
436ca963 ILT |
905 | // If building a shared library (or a position-independent |
906 | // executable), we need to create a dynamic relocation for | |
907 | // this location. The relocation applied at link time will | |
908 | // apply the link-time value, so we flag the location with | |
909 | // an R_386_RELATIVE relocation so the dynamic loader can | |
910 | // relocate it easily. | |
8851ecca | 911 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
912 | { |
913 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
914 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
915 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
916 | output_section, data_shndx, | |
917 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
918 | } |
919 | break; | |
920 | ||
921 | case elfcpp::R_386_16: | |
922 | case elfcpp::R_386_8: | |
923 | // If building a shared library (or a position-independent | |
924 | // executable), we need to create a dynamic relocation for | |
925 | // this location. Because the addend needs to remain in the | |
926 | // data section, we need to be careful not to apply this | |
927 | // relocation statically. | |
8851ecca | 928 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
929 | { |
930 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 931 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 932 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
933 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
934 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
935 | else |
936 | { | |
937 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
938 | unsigned int shndx = lsym.get_st_shndx(); |
939 | bool is_ordinary; | |
940 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
941 | &is_ordinary); | |
942 | if (!is_ordinary) | |
943 | object->error(_("section symbol %u has bad shndx %u"), | |
944 | r_sym, shndx); | |
945 | else | |
946 | rel_dyn->add_local_section(object, shndx, | |
947 | r_type, output_section, | |
948 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 949 | } |
436ca963 | 950 | } |
92e059d8 ILT |
951 | break; |
952 | ||
953 | case elfcpp::R_386_PC32: | |
954 | case elfcpp::R_386_PC16: | |
955 | case elfcpp::R_386_PC8: | |
956 | break; | |
957 | ||
df2efe71 ILT |
958 | case elfcpp::R_386_PLT32: |
959 | // Since we know this is a local symbol, we can handle this as a | |
960 | // PC32 reloc. | |
961 | break; | |
962 | ||
ead1e424 ILT |
963 | case elfcpp::R_386_GOTOFF: |
964 | case elfcpp::R_386_GOTPC: | |
965 | // We need a GOT section. | |
7e1edb90 | 966 | target->got_section(symtab, layout); |
ead1e424 ILT |
967 | break; |
968 | ||
1b64748b ILT |
969 | case elfcpp::R_386_GOT32: |
970 | { | |
971 | // The symbol requires a GOT entry. | |
972 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
973 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 974 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
975 | { |
976 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 977 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 978 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
979 | { |
980 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2ea97941 | 981 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
982 | rel_dyn->add_local_relative( |
983 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
984 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
985 | } |
986 | } | |
987 | } | |
988 | break; | |
989 | ||
af6359d5 ILT |
990 | // These are relocations which should only be seen by the |
991 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
992 | case elfcpp::R_386_COPY: |
993 | case elfcpp::R_386_GLOB_DAT: | |
994 | case elfcpp::R_386_JUMP_SLOT: | |
995 | case elfcpp::R_386_RELATIVE: | |
996 | case elfcpp::R_386_TLS_TPOFF: | |
997 | case elfcpp::R_386_TLS_DTPMOD32: | |
998 | case elfcpp::R_386_TLS_DTPOFF32: | |
999 | case elfcpp::R_386_TLS_TPOFF32: | |
1000 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 1001 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 1002 | object->name().c_str(), r_type); |
92e059d8 ILT |
1003 | break; |
1004 | ||
af6359d5 | 1005 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1006 | // linking. |
56622147 ILT |
1007 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1008 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1009 | case elfcpp::R_386_TLS_DESC_CALL: | |
1010 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1011 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1012 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1013 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1014 | case elfcpp::R_386_TLS_GOTIE: |
1015 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1016 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1017 | { |
8851ecca | 1018 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1019 | const tls::Tls_optimization optimized_type |
1020 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1021 | switch (r_type) |
1022 | { | |
56622147 | 1023 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1024 | if (optimized_type == tls::TLSOPT_NONE) |
1025 | { | |
1026 | // Create a pair of GOT entries for the module index and | |
1027 | // dtv-relative offset. | |
1028 | Output_data_got<32, false>* got | |
1029 | = target->got_section(symtab, layout); | |
1030 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1031 | unsigned int shndx = lsym.get_st_shndx(); |
1032 | bool is_ordinary; | |
1033 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1034 | if (!is_ordinary) | |
1035 | object->error(_("local symbol %u has bad shndx %u"), | |
1036 | r_sym, shndx); | |
1037 | else | |
1038 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1039 | GOT_TYPE_TLS_PAIR, | |
1040 | target->rel_dyn_section(layout), | |
1041 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1042 | } |
1043 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1044 | unsupported_reloc_local(object, r_type); | |
1045 | break; | |
1046 | ||
56622147 | 1047 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1048 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1049 | if (optimized_type == tls::TLSOPT_NONE) |
1050 | { | |
1051 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1052 | Output_data_got<32, false>* got | |
1053 | = target->got_section(symtab, layout); | |
1054 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1055 | unsigned int shndx = lsym.get_st_shndx(); |
1056 | bool is_ordinary; | |
1057 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1058 | if (!is_ordinary) | |
1059 | object->error(_("local symbol %u has bad shndx %u"), | |
1060 | r_sym, shndx); | |
1061 | else | |
1062 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1063 | GOT_TYPE_TLS_DESC, | |
1064 | target->rel_dyn_section(layout), | |
1065 | elfcpp::R_386_TLS_DESC, 0); | |
c2b45e22 CC |
1066 | } |
1067 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1068 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1069 | break; |
1070 | ||
c2b45e22 CC |
1071 | case elfcpp::R_386_TLS_DESC_CALL: |
1072 | break; | |
1073 | ||
56622147 | 1074 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1075 | if (optimized_type == tls::TLSOPT_NONE) |
1076 | { | |
1077 | // Create a GOT entry for the module index. | |
94c4710f | 1078 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1079 | } |
1080 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1081 | unsupported_reloc_local(object, r_type); |
1082 | break; | |
1083 | ||
56622147 | 1084 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1085 | break; |
1086 | ||
56622147 ILT |
1087 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1088 | case elfcpp::R_386_TLS_IE_32: | |
1089 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1090 | layout->set_has_static_tls(); |
07f397ab ILT |
1091 | if (optimized_type == tls::TLSOPT_NONE) |
1092 | { | |
7bf1f802 ILT |
1093 | // For the R_386_TLS_IE relocation, we need to create a |
1094 | // dynamic relocation when building a shared library. | |
1095 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1096 | && parameters->options().shared()) |
7bf1f802 ILT |
1097 | { |
1098 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1099 | unsigned int r_sym |
1100 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1101 | rel_dyn->add_local_relative(object, r_sym, | |
1102 | elfcpp::R_386_RELATIVE, | |
1103 | output_section, data_shndx, | |
1104 | reloc.get_r_offset()); | |
7bf1f802 | 1105 | } |
07f397ab ILT |
1106 | // Create a GOT entry for the tp-relative offset. |
1107 | Output_data_got<32, false>* got | |
1108 | = target->got_section(symtab, layout); | |
1109 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1110 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1111 | ? elfcpp::R_386_TLS_TPOFF32 | |
1112 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1113 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1114 | ? GOT_TYPE_TLS_OFFSET | |
1115 | : GOT_TYPE_TLS_NOFFSET); | |
1116 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1117 | target->rel_dyn_section(layout), |
1118 | dyn_r_type); | |
07f397ab ILT |
1119 | } |
1120 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1121 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1122 | break; |
af6359d5 | 1123 | |
56622147 ILT |
1124 | case elfcpp::R_386_TLS_LE: // Local-exec |
1125 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1126 | layout->set_has_static_tls(); |
07f397ab | 1127 | if (output_is_shared) |
7bf1f802 ILT |
1128 | { |
1129 | // We need to create a dynamic relocation. | |
dceae3c1 | 1130 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1131 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1132 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1133 | ? elfcpp::R_386_TLS_TPOFF32 | |
1134 | : elfcpp::R_386_TLS_TPOFF); | |
1135 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1136 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1137 | data_shndx, reloc.get_r_offset()); | |
1138 | } | |
56622147 ILT |
1139 | break; |
1140 | ||
af6359d5 ILT |
1141 | default: |
1142 | gold_unreachable(); | |
7e1edb90 ILT |
1143 | } |
1144 | } | |
92e059d8 ILT |
1145 | break; |
1146 | ||
92e059d8 ILT |
1147 | case elfcpp::R_386_32PLT: |
1148 | case elfcpp::R_386_TLS_GD_32: | |
1149 | case elfcpp::R_386_TLS_GD_PUSH: | |
1150 | case elfcpp::R_386_TLS_GD_CALL: | |
1151 | case elfcpp::R_386_TLS_GD_POP: | |
1152 | case elfcpp::R_386_TLS_LDM_32: | |
1153 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1154 | case elfcpp::R_386_TLS_LDM_CALL: | |
1155 | case elfcpp::R_386_TLS_LDM_POP: | |
1156 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1157 | default: | |
af6359d5 | 1158 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1159 | break; |
1160 | } | |
1161 | } | |
1162 | ||
af6359d5 ILT |
1163 | // Report an unsupported relocation against a global symbol. |
1164 | ||
1165 | void | |
1166 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1167 | unsigned int r_type, | |
1168 | Symbol* gsym) | |
1169 | { | |
75f2446e | 1170 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1171 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1172 | } |
1173 | ||
92e059d8 ILT |
1174 | // Scan a relocation for a global symbol. |
1175 | ||
1176 | inline void | |
ad0f2072 | 1177 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1178 | Layout* layout, |
1179 | Target_i386* target, | |
f6ce93d6 | 1180 | Sized_relobj<32, false>* object, |
a3ad94ed | 1181 | unsigned int data_shndx, |
07f397ab | 1182 | Output_section* output_section, |
a3ad94ed ILT |
1183 | const elfcpp::Rel<32, false>& reloc, |
1184 | unsigned int r_type, | |
92e059d8 ILT |
1185 | Symbol* gsym) |
1186 | { | |
1187 | switch (r_type) | |
1188 | { | |
1189 | case elfcpp::R_386_NONE: | |
1190 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1191 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1192 | break; |
1193 | ||
1194 | case elfcpp::R_386_32: | |
92e059d8 | 1195 | case elfcpp::R_386_16: |
92e059d8 | 1196 | case elfcpp::R_386_8: |
96f2030e | 1197 | { |
d61c6bd4 ILT |
1198 | // Make a PLT entry if necessary. |
1199 | if (gsym->needs_plt_entry()) | |
1200 | { | |
1201 | target->make_plt_entry(symtab, layout, gsym); | |
1202 | // Since this is not a PC-relative relocation, we may be | |
1203 | // taking the address of a function. In that case we need to | |
1204 | // set the entry in the dynamic symbol table to the address of | |
1205 | // the PLT entry. | |
8851ecca | 1206 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1207 | gsym->set_needs_dynsym_value(); |
1208 | } | |
1209 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1210 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1211 | { |
966d4097 | 1212 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1213 | { |
12c0daef | 1214 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1215 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1216 | } |
1217 | else if (r_type == elfcpp::R_386_32 | |
1218 | && gsym->can_use_relative_reloc(false)) | |
1219 | { | |
1220 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1221 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1222 | output_section, object, | |
1223 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1224 | } |
1225 | else | |
1226 | { | |
96f2030e | 1227 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1228 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1229 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1230 | } |
1231 | } | |
1232 | } | |
1233 | break; | |
1234 | ||
1235 | case elfcpp::R_386_PC32: | |
1236 | case elfcpp::R_386_PC16: | |
1237 | case elfcpp::R_386_PC8: | |
1238 | { | |
1239 | // Make a PLT entry if necessary. | |
1240 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1241 | { |
1242 | // These relocations are used for function calls only in | |
1243 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1244 | // we'll need a text relocation anyway, so we can skip the | |
1245 | // PLT entry and let the dynamic linker bind the call directly | |
1246 | // to the target. For smaller relocations, we should use a | |
1247 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1248 | if (!parameters->options().shared() |
7bf1f802 ILT |
1249 | || r_type != elfcpp::R_386_PC32) |
1250 | target->make_plt_entry(symtab, layout, gsym); | |
1251 | } | |
d61c6bd4 | 1252 | // Make a dynamic relocation if necessary. |
0700cf32 | 1253 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1254 | if (gsym->is_func()) |
0700cf32 ILT |
1255 | flags |= Symbol::FUNCTION_CALL; |
1256 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1257 | { |
966d4097 | 1258 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1259 | { |
12c0daef | 1260 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1261 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1262 | } |
86849f1f | 1263 | else |
d61c6bd4 ILT |
1264 | { |
1265 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1266 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1267 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1268 | } |
96f2030e ILT |
1269 | } |
1270 | } | |
92e059d8 ILT |
1271 | break; |
1272 | ||
ead1e424 | 1273 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1274 | { |
1275 | // The symbol requires a GOT entry. | |
7e1edb90 | 1276 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1277 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1278 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1279 | else |
1280 | { | |
8462ae85 | 1281 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1282 | // GOT entry with a dynamic relocation. |
1283 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1284 | if (gsym->is_from_dynobj() |
1285 | || gsym->is_undefined() | |
1286 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1287 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1288 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1289 | else |
8462ae85 | 1290 | { |
0a65a3a7 CC |
1291 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1292 | rel_dyn->add_global_relative( | |
1293 | gsym, elfcpp::R_386_RELATIVE, got, | |
1294 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1295 | } |
1296 | } | |
1297 | } | |
ead1e424 ILT |
1298 | break; |
1299 | ||
1300 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1301 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1302 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1303 | if (gsym->final_value_is_known()) |
ead1e424 | 1304 | break; |
436ca963 ILT |
1305 | // If building a shared library, we can also skip the PLT entry |
1306 | // if the symbol is defined in the output file and is protected | |
1307 | // or hidden. | |
1308 | if (gsym->is_defined() | |
1309 | && !gsym->is_from_dynobj() | |
1310 | && !gsym->is_preemptible()) | |
1311 | break; | |
7e1edb90 | 1312 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1313 | break; |
1314 | ||
1315 | case elfcpp::R_386_GOTOFF: | |
1316 | case elfcpp::R_386_GOTPC: | |
1317 | // We need a GOT section. | |
7e1edb90 | 1318 | target->got_section(symtab, layout); |
ead1e424 ILT |
1319 | break; |
1320 | ||
af6359d5 ILT |
1321 | // These are relocations which should only be seen by the |
1322 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1323 | case elfcpp::R_386_COPY: |
1324 | case elfcpp::R_386_GLOB_DAT: | |
1325 | case elfcpp::R_386_JUMP_SLOT: | |
1326 | case elfcpp::R_386_RELATIVE: | |
1327 | case elfcpp::R_386_TLS_TPOFF: | |
1328 | case elfcpp::R_386_TLS_DTPMOD32: | |
1329 | case elfcpp::R_386_TLS_DTPOFF32: | |
1330 | case elfcpp::R_386_TLS_TPOFF32: | |
1331 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1332 | gold_error(_("%s: unexpected reloc %u in object file"), |
1333 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1334 | break; |
1335 | ||
d61c17ea ILT |
1336 | // These are initial tls relocs, which are expected when |
1337 | // linking. | |
56622147 ILT |
1338 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1339 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1340 | case elfcpp::R_386_TLS_DESC_CALL: | |
1341 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1342 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1343 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1344 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1345 | case elfcpp::R_386_TLS_GOTIE: |
1346 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1347 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1348 | { |
7e1edb90 | 1349 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1350 | const tls::Tls_optimization optimized_type |
1351 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1352 | switch (r_type) |
1353 | { | |
56622147 | 1354 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1355 | if (optimized_type == tls::TLSOPT_NONE) |
1356 | { | |
1357 | // Create a pair of GOT entries for the module index and | |
1358 | // dtv-relative offset. | |
1359 | Output_data_got<32, false>* got | |
1360 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1361 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1362 | target->rel_dyn_section(layout), |
1363 | elfcpp::R_386_TLS_DTPMOD32, | |
1364 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1365 | } |
1366 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1367 | { | |
1368 | // Create a GOT entry for the tp-relative offset. | |
1369 | Output_data_got<32, false>* got | |
1370 | = target->got_section(symtab, layout); | |
c2b45e22 | 1371 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1372 | target->rel_dyn_section(layout), |
c2b45e22 | 1373 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1374 | } |
1375 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1376 | unsupported_reloc_global(object, r_type, gsym); | |
1377 | break; | |
1378 | ||
56622147 | 1379 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1380 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1381 | if (optimized_type == tls::TLSOPT_NONE) |
1382 | { | |
1383 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1384 | Output_data_got<32, false>* got | |
1385 | = target->got_section(symtab, layout); | |
1386 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1387 | target->rel_dyn_section(layout), | |
1388 | elfcpp::R_386_TLS_DESC, 0); | |
1389 | } | |
1390 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1391 | { | |
1392 | // Create a GOT entry for the tp-relative offset. | |
1393 | Output_data_got<32, false>* got | |
1394 | = target->got_section(symtab, layout); | |
1395 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1396 | target->rel_dyn_section(layout), | |
1397 | elfcpp::R_386_TLS_TPOFF); | |
1398 | } | |
1399 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1400 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1401 | break; |
1402 | ||
1403 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1404 | break; |
1405 | ||
56622147 | 1406 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1407 | if (optimized_type == tls::TLSOPT_NONE) |
1408 | { | |
1409 | // Create a GOT entry for the module index. | |
94c4710f | 1410 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1411 | } |
1412 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1413 | unsupported_reloc_global(object, r_type, gsym); |
1414 | break; | |
1415 | ||
56622147 | 1416 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1417 | break; |
1418 | ||
56622147 ILT |
1419 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1420 | case elfcpp::R_386_TLS_IE_32: | |
1421 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1422 | layout->set_has_static_tls(); |
07f397ab ILT |
1423 | if (optimized_type == tls::TLSOPT_NONE) |
1424 | { | |
7bf1f802 ILT |
1425 | // For the R_386_TLS_IE relocation, we need to create a |
1426 | // dynamic relocation when building a shared library. | |
1427 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1428 | && parameters->options().shared()) |
07f397ab | 1429 | { |
07f397ab | 1430 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1431 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1432 | output_section, object, | |
1433 | data_shndx, | |
1434 | reloc.get_r_offset()); | |
07f397ab | 1435 | } |
7bf1f802 ILT |
1436 | // Create a GOT entry for the tp-relative offset. |
1437 | Output_data_got<32, false>* got | |
1438 | = target->got_section(symtab, layout); | |
1439 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1440 | ? elfcpp::R_386_TLS_TPOFF32 | |
1441 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1442 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1443 | ? GOT_TYPE_TLS_OFFSET | |
1444 | : GOT_TYPE_TLS_NOFFSET); | |
1445 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1446 | target->rel_dyn_section(layout), |
1447 | dyn_r_type); | |
07f397ab ILT |
1448 | } |
1449 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1450 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1451 | break; |
af6359d5 | 1452 | |
56622147 ILT |
1453 | case elfcpp::R_386_TLS_LE: // Local-exec |
1454 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1455 | layout->set_has_static_tls(); |
8851ecca | 1456 | if (parameters->options().shared()) |
7bf1f802 ILT |
1457 | { |
1458 | // We need to create a dynamic relocation. | |
1459 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1460 | ? elfcpp::R_386_TLS_TPOFF32 | |
1461 | : elfcpp::R_386_TLS_TPOFF); | |
1462 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1463 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1464 | data_shndx, reloc.get_r_offset()); | |
1465 | } | |
56622147 ILT |
1466 | break; |
1467 | ||
af6359d5 ILT |
1468 | default: |
1469 | gold_unreachable(); | |
a3ad94ed ILT |
1470 | } |
1471 | } | |
92e059d8 ILT |
1472 | break; |
1473 | ||
92e059d8 ILT |
1474 | case elfcpp::R_386_32PLT: |
1475 | case elfcpp::R_386_TLS_GD_32: | |
1476 | case elfcpp::R_386_TLS_GD_PUSH: | |
1477 | case elfcpp::R_386_TLS_GD_CALL: | |
1478 | case elfcpp::R_386_TLS_GD_POP: | |
1479 | case elfcpp::R_386_TLS_LDM_32: | |
1480 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1481 | case elfcpp::R_386_TLS_LDM_CALL: | |
1482 | case elfcpp::R_386_TLS_LDM_POP: | |
1483 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1484 | default: | |
af6359d5 | 1485 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1486 | break; |
1487 | } | |
1488 | } | |
1489 | ||
6d03d481 ST |
1490 | // Process relocations for gc. |
1491 | ||
1492 | void | |
ad0f2072 | 1493 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1494 | Layout* layout, |
1495 | Sized_relobj<32, false>* object, | |
1496 | unsigned int data_shndx, | |
1497 | unsigned int, | |
1498 | const unsigned char* prelocs, | |
1499 | size_t reloc_count, | |
1500 | Output_section* output_section, | |
1501 | bool needs_special_offset_handling, | |
1502 | size_t local_symbol_count, | |
1503 | const unsigned char* plocal_symbols) | |
1504 | { | |
1505 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
1506 | Target_i386::Scan>( | |
6d03d481 ST |
1507 | symtab, |
1508 | layout, | |
1509 | this, | |
1510 | object, | |
1511 | data_shndx, | |
1512 | prelocs, | |
1513 | reloc_count, | |
1514 | output_section, | |
1515 | needs_special_offset_handling, | |
1516 | local_symbol_count, | |
1517 | plocal_symbols); | |
1518 | } | |
1519 | ||
92e059d8 ILT |
1520 | // Scan relocations for a section. |
1521 | ||
1522 | void | |
ad0f2072 | 1523 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 1524 | Layout* layout, |
f6ce93d6 | 1525 | Sized_relobj<32, false>* object, |
a3ad94ed | 1526 | unsigned int data_shndx, |
92e059d8 ILT |
1527 | unsigned int sh_type, |
1528 | const unsigned char* prelocs, | |
1529 | size_t reloc_count, | |
730cdc88 ILT |
1530 | Output_section* output_section, |
1531 | bool needs_special_offset_handling, | |
92e059d8 | 1532 | size_t local_symbol_count, |
730cdc88 | 1533 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1534 | { |
1535 | if (sh_type == elfcpp::SHT_RELA) | |
1536 | { | |
75f2446e ILT |
1537 | gold_error(_("%s: unsupported RELA reloc section"), |
1538 | object->name().c_str()); | |
1539 | return; | |
92e059d8 ILT |
1540 | } |
1541 | ||
ead1e424 ILT |
1542 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1543 | Target_i386::Scan>( | |
92e059d8 | 1544 | symtab, |
ead1e424 ILT |
1545 | layout, |
1546 | this, | |
92e059d8 | 1547 | object, |
a3ad94ed | 1548 | data_shndx, |
92e059d8 ILT |
1549 | prelocs, |
1550 | reloc_count, | |
730cdc88 ILT |
1551 | output_section, |
1552 | needs_special_offset_handling, | |
92e059d8 | 1553 | local_symbol_count, |
730cdc88 | 1554 | plocal_symbols); |
92e059d8 ILT |
1555 | } |
1556 | ||
16649710 | 1557 | // Finalize the sections. |
5a6f7e2d ILT |
1558 | |
1559 | void | |
f59f41f3 DK |
1560 | Target_i386::do_finalize_sections( |
1561 | Layout* layout, | |
1562 | const Input_objects*, | |
1563 | Symbol_table*) | |
5a6f7e2d | 1564 | { |
16649710 ILT |
1565 | // Fill in some more dynamic tags. |
1566 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1567 | if (odyn != NULL) | |
1568 | { | |
22b127cc ILT |
1569 | if (this->got_plt_ != NULL |
1570 | && this->got_plt_->output_section() != NULL) | |
16649710 ILT |
1571 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); |
1572 | ||
22b127cc ILT |
1573 | if (this->plt_ != NULL |
1574 | && this->plt_->output_section() != NULL) | |
16649710 ILT |
1575 | { |
1576 | const Output_data* od = this->plt_->rel_plt(); | |
1577 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1578 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1579 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1580 | } | |
1581 | ||
22b127cc ILT |
1582 | if (this->rel_dyn_ != NULL |
1583 | && this->rel_dyn_->output_section() != NULL) | |
16649710 ILT |
1584 | { |
1585 | const Output_data* od = this->rel_dyn_; | |
1586 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1587 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1588 | odyn->add_constant(elfcpp::DT_RELENT, | |
1589 | elfcpp::Elf_sizes<32>::rel_size); | |
1590 | } | |
1591 | ||
8851ecca | 1592 | if (!parameters->options().shared()) |
16649710 ILT |
1593 | { |
1594 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1595 | // linker at run time, and used by the debugger. | |
1596 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1601 | // relocs. | |
12c0daef ILT |
1602 | if (this->copy_relocs_.any_saved_relocs()) |
1603 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1604 | } |
1605 | ||
86849f1f ILT |
1606 | // Return whether a direct absolute static relocation needs to be applied. |
1607 | // In cases where Scan::local() or Scan::global() has created | |
1608 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1609 | // of the relocation is carried in the data, and we must not | |
1610 | // apply the static relocation. | |
1611 | ||
1612 | inline bool | |
1613 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1614 | int ref_flags, |
031cdbed ILT |
1615 | bool is_32bit, |
1616 | Output_section* output_section) | |
86849f1f | 1617 | { |
031cdbed ILT |
1618 | // If the output section is not allocated, then we didn't call |
1619 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1620 | // the reloc here. | |
1621 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1622 | return true; | |
1623 | ||
d61c6bd4 ILT |
1624 | // For local symbols, we will have created a non-RELATIVE dynamic |
1625 | // relocation only if (a) the output is position independent, | |
1626 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1627 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1628 | if (gsym == NULL) |
8851ecca | 1629 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1630 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1631 | && !is_32bit); |
86849f1f | 1632 | |
0700cf32 ILT |
1633 | // For global symbols, we use the same helper routines used in the |
1634 | // scan pass. If we did not create a dynamic relocation, or if we | |
1635 | // created a RELATIVE dynamic relocation, we should apply the static | |
1636 | // relocation. | |
1637 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1638 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1639 | && gsym->can_use_relative_reloc(ref_flags | |
1640 | & Symbol::FUNCTION_CALL); | |
1641 | return !has_dyn || is_rel; | |
86849f1f ILT |
1642 | } |
1643 | ||
61ba1cf9 ILT |
1644 | // Perform a relocation. |
1645 | ||
ead1e424 | 1646 | inline bool |
92e059d8 | 1647 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1648 | Target_i386* target, |
031cdbed | 1649 | Output_section *output_section, |
92e059d8 ILT |
1650 | size_t relnum, |
1651 | const elfcpp::Rel<32, false>& rel, | |
1652 | unsigned int r_type, | |
c06b7b0b | 1653 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1654 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1655 | unsigned char* view, |
1656 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1657 | section_size_type view_size) |
61ba1cf9 | 1658 | { |
ead1e424 ILT |
1659 | if (this->skip_call_tls_get_addr_) |
1660 | { | |
5efc7cd2 CC |
1661 | if ((r_type != elfcpp::R_386_PLT32 |
1662 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1663 | || gsym == NULL |
1664 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1665 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1666 | _("missing expected TLS relocation")); | |
1667 | else | |
ead1e424 | 1668 | { |
75f2446e ILT |
1669 | this->skip_call_tls_get_addr_ = false; |
1670 | return false; | |
ead1e424 | 1671 | } |
ead1e424 ILT |
1672 | } |
1673 | ||
a3ad94ed | 1674 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1675 | Symbol_value<32> symval; |
436ca963 | 1676 | if (gsym != NULL |
de4c45bd ILT |
1677 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1678 | || r_type == elfcpp::R_386_PC16 | |
1679 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1680 | { |
b8e6aad9 ILT |
1681 | symval.set_output_value(target->plt_section()->address() |
1682 | + gsym->plt_offset()); | |
1683 | psymval = &symval; | |
a3ad94ed ILT |
1684 | } |
1685 | ||
b8e6aad9 ILT |
1686 | const Sized_relobj<32, false>* object = relinfo->object; |
1687 | ||
1b64748b | 1688 | // Get the GOT offset if needed. |
96f2030e ILT |
1689 | // The GOT pointer points to the end of the GOT section. |
1690 | // We need to subtract the size of the GOT section to get | |
1691 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1692 | bool have_got_offset = false; |
1693 | unsigned int got_offset = 0; | |
1694 | switch (r_type) | |
1695 | { | |
1696 | case elfcpp::R_386_GOT32: | |
1697 | if (gsym != NULL) | |
1698 | { | |
0a65a3a7 CC |
1699 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1700 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1701 | - target->got_size()); | |
1b64748b ILT |
1702 | } |
1703 | else | |
1704 | { | |
1705 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1706 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1707 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1708 | - target->got_size()); | |
1b64748b ILT |
1709 | } |
1710 | have_got_offset = true; | |
1711 | break; | |
1712 | ||
1713 | default: | |
1714 | break; | |
1715 | } | |
1716 | ||
61ba1cf9 ILT |
1717 | switch (r_type) |
1718 | { | |
1719 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1720 | case elfcpp::R_386_GNU_VTINHERIT: |
1721 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1722 | break; |
1723 | ||
1724 | case elfcpp::R_386_32: | |
031cdbed ILT |
1725 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1726 | output_section)) | |
86849f1f | 1727 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1728 | break; |
1729 | ||
1730 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1731 | { |
0700cf32 | 1732 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1733 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1734 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1735 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1736 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1737 | } | |
92e059d8 ILT |
1738 | break; |
1739 | ||
1740 | case elfcpp::R_386_16: | |
031cdbed ILT |
1741 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1742 | output_section)) | |
86849f1f | 1743 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1744 | break; |
1745 | ||
1746 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1747 | { |
0700cf32 | 1748 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1749 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1750 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1751 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1752 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1753 | } |
61ba1cf9 ILT |
1754 | break; |
1755 | ||
92e059d8 | 1756 | case elfcpp::R_386_8: |
031cdbed ILT |
1757 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1758 | output_section)) | |
86849f1f | 1759 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1760 | break; |
1761 | ||
1762 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1763 | { |
0700cf32 | 1764 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1765 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1766 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed ILT |
1767 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1768 | output_section)) | |
d09e9154 | 1769 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1770 | } |
92e059d8 ILT |
1771 | break; |
1772 | ||
ead1e424 | 1773 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1774 | gold_assert(gsym == NULL |
1775 | || gsym->has_plt_offset() | |
99f8faca ILT |
1776 | || gsym->final_value_is_known() |
1777 | || (gsym->is_defined() | |
1778 | && !gsym->is_from_dynobj() | |
1779 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1780 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1781 | break; |
1782 | ||
1783 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1784 | gold_assert(have_got_offset); |
1785 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1786 | break; |
1787 | ||
1788 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1789 | { |
1790 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1791 | value = (psymval->value(object, 0) | |
96f2030e | 1792 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1793 | Relocate_functions<32, false>::rel32(view, value); |
1794 | } | |
ead1e424 ILT |
1795 | break; |
1796 | ||
1797 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1798 | { |
1799 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1800 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1801 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1802 | } | |
ead1e424 ILT |
1803 | break; |
1804 | ||
92e059d8 ILT |
1805 | case elfcpp::R_386_COPY: |
1806 | case elfcpp::R_386_GLOB_DAT: | |
1807 | case elfcpp::R_386_JUMP_SLOT: | |
1808 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1809 | // These are outstanding tls relocs, which are unexpected when |
1810 | // linking. | |
92e059d8 ILT |
1811 | case elfcpp::R_386_TLS_TPOFF: |
1812 | case elfcpp::R_386_TLS_DTPMOD32: | |
1813 | case elfcpp::R_386_TLS_DTPOFF32: | |
1814 | case elfcpp::R_386_TLS_TPOFF32: | |
1815 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1816 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1817 | _("unexpected reloc %u in object file"), | |
1818 | r_type); | |
92e059d8 ILT |
1819 | break; |
1820 | ||
d61c17ea ILT |
1821 | // These are initial tls relocs, which are expected when |
1822 | // linking. | |
56622147 ILT |
1823 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1824 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1825 | case elfcpp::R_386_TLS_DESC_CALL: | |
1826 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1827 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1828 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1829 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1830 | case elfcpp::R_386_TLS_GOTIE: |
1831 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1832 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1833 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1834 | view, address, view_size); | |
92e059d8 ILT |
1835 | break; |
1836 | ||
92e059d8 ILT |
1837 | case elfcpp::R_386_32PLT: |
1838 | case elfcpp::R_386_TLS_GD_32: | |
1839 | case elfcpp::R_386_TLS_GD_PUSH: | |
1840 | case elfcpp::R_386_TLS_GD_CALL: | |
1841 | case elfcpp::R_386_TLS_GD_POP: | |
1842 | case elfcpp::R_386_TLS_LDM_32: | |
1843 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1844 | case elfcpp::R_386_TLS_LDM_CALL: | |
1845 | case elfcpp::R_386_TLS_LDM_POP: | |
1846 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1847 | default: |
75f2446e ILT |
1848 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1849 | _("unsupported reloc %u"), | |
1850 | r_type); | |
92e059d8 ILT |
1851 | break; |
1852 | } | |
ead1e424 ILT |
1853 | |
1854 | return true; | |
92e059d8 ILT |
1855 | } |
1856 | ||
1857 | // Perform a TLS relocation. | |
1858 | ||
1859 | inline void | |
1860 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1861 | Target_i386* target, |
92e059d8 ILT |
1862 | size_t relnum, |
1863 | const elfcpp::Rel<32, false>& rel, | |
1864 | unsigned int r_type, | |
c06b7b0b | 1865 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1866 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1867 | unsigned char* view, |
1868 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1869 | section_size_type view_size) |
92e059d8 ILT |
1870 | { |
1871 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1872 | |
07f397ab ILT |
1873 | const Sized_relobj<32, false>* object = relinfo->object; |
1874 | ||
1875 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1876 | |
8851ecca ILT |
1877 | const bool is_final = |
1878 | (gsym == NULL | |
1879 | ? !parameters->options().output_is_position_independent() | |
1880 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1881 | const tls::Tls_optimization optimized_type |
1882 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1883 | switch (r_type) |
1884 | { | |
56622147 | 1885 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1886 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1887 | { |
07f397ab | 1888 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1889 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1890 | rel, r_type, value, view, | |
1891 | view_size); | |
92e059d8 ILT |
1892 | break; |
1893 | } | |
07f397ab ILT |
1894 | else |
1895 | { | |
c2b45e22 CC |
1896 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1897 | ? GOT_TYPE_TLS_NOFFSET | |
1898 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1899 | unsigned int got_offset; |
1900 | if (gsym != NULL) | |
1901 | { | |
c2b45e22 CC |
1902 | gold_assert(gsym->has_got_offset(got_type)); |
1903 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1904 | } |
1905 | else | |
1906 | { | |
1907 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1908 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1909 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1910 | - target->got_size()); |
1911 | } | |
1912 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1913 | { | |
1914 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1915 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1916 | got_offset, view, view_size); | |
07f397ab ILT |
1917 | break; |
1918 | } | |
1919 | else if (optimized_type == tls::TLSOPT_NONE) | |
1920 | { | |
1921 | // Relocate the field with the offset of the pair of GOT | |
1922 | // entries. | |
1923 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1924 | break; | |
1925 | } | |
1926 | } | |
75f2446e ILT |
1927 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1928 | _("unsupported reloc %u"), | |
1929 | r_type); | |
92e059d8 ILT |
1930 | break; |
1931 | ||
56622147 ILT |
1932 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1933 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 1934 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1935 | if (optimized_type == tls::TLSOPT_TO_LE) |
1936 | { | |
1937 | gold_assert(tls_segment != NULL); | |
1938 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1939 | rel, r_type, value, view, | |
1940 | view_size); | |
1941 | break; | |
1942 | } | |
1943 | else | |
1944 | { | |
1945 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1946 | ? GOT_TYPE_TLS_NOFFSET | |
1947 | : GOT_TYPE_TLS_DESC); | |
1948 | unsigned int got_offset; | |
1949 | if (gsym != NULL) | |
1950 | { | |
1951 | gold_assert(gsym->has_got_offset(got_type)); | |
1952 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1953 | } | |
1954 | else | |
1955 | { | |
1956 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1957 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1958 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1959 | - target->got_size()); | |
1960 | } | |
1961 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1962 | { | |
1963 | gold_assert(tls_segment != NULL); | |
1964 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1965 | got_offset, view, view_size); | |
1966 | break; | |
1967 | } | |
1968 | else if (optimized_type == tls::TLSOPT_NONE) | |
1969 | { | |
1970 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1971 | { | |
1972 | // Relocate the field with the offset of the pair of GOT | |
1973 | // entries. | |
1974 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1975 | } | |
1976 | break; | |
1977 | } | |
1978 | } | |
75f2446e ILT |
1979 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1980 | _("unsupported reloc %u"), | |
1981 | r_type); | |
ead1e424 ILT |
1982 | break; |
1983 | ||
56622147 | 1984 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1985 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1986 | { | |
75f2446e ILT |
1987 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1988 | _("both SUN and GNU model " | |
1989 | "TLS relocations")); | |
1990 | break; | |
46cf9fa2 ILT |
1991 | } |
1992 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1993 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1994 | { |
07f397ab | 1995 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1996 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1997 | value, view, view_size); | |
1998 | break; | |
1999 | } | |
07f397ab ILT |
2000 | else if (optimized_type == tls::TLSOPT_NONE) |
2001 | { | |
2002 | // Relocate the field with the offset of the GOT entry for | |
2003 | // the module index. | |
2004 | unsigned int got_offset; | |
94c4710f ILT |
2005 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2006 | - target->got_size()); | |
07f397ab ILT |
2007 | Relocate_functions<32, false>::rel32(view, got_offset); |
2008 | break; | |
2009 | } | |
75f2446e ILT |
2010 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2011 | _("unsupported reloc %u"), | |
2012 | r_type); | |
46cf9fa2 ILT |
2013 | break; |
2014 | ||
56622147 | 2015 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2016 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2017 | { |
82bb573a ILT |
2018 | // This reloc can appear in debugging sections, in which |
2019 | // case we must not convert to local-exec. We decide what | |
2020 | // to do based on whether the section is marked as | |
2021 | // containing executable code. That is what the GNU linker | |
2022 | // does as well. | |
2023 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2024 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2025 | { |
2026 | gold_assert(tls_segment != NULL); | |
2027 | value -= tls_segment->memsz(); | |
2028 | } | |
e8a9fcda | 2029 | } |
46cf9fa2 ILT |
2030 | Relocate_functions<32, false>::rel32(view, value); |
2031 | break; | |
2032 | ||
56622147 ILT |
2033 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2034 | case elfcpp::R_386_TLS_GOTIE: | |
2035 | case elfcpp::R_386_TLS_IE_32: | |
2036 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2037 | { | |
07f397ab | 2038 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2039 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2040 | rel, r_type, value, view, | |
2041 | view_size); | |
2042 | break; | |
2043 | } | |
07f397ab ILT |
2044 | else if (optimized_type == tls::TLSOPT_NONE) |
2045 | { | |
2046 | // Relocate the field with the offset of the GOT entry for | |
2047 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2048 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2049 | ? GOT_TYPE_TLS_OFFSET | |
2050 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2051 | unsigned int got_offset; |
2052 | if (gsym != NULL) | |
2053 | { | |
c2b45e22 CC |
2054 | gold_assert(gsym->has_got_offset(got_type)); |
2055 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2056 | } |
2057 | else | |
2058 | { | |
2059 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2060 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2061 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2062 | } |
2063 | // For the R_386_TLS_IE relocation, we need to apply the | |
2064 | // absolute address of the GOT entry. | |
2065 | if (r_type == elfcpp::R_386_TLS_IE) | |
2066 | got_offset += target->got_plt_section()->address(); | |
2067 | // All GOT offsets are relative to the end of the GOT. | |
2068 | got_offset -= target->got_size(); | |
2069 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2070 | break; | |
2071 | } | |
75f2446e ILT |
2072 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2073 | _("unsupported reloc %u"), | |
2074 | r_type); | |
92e059d8 | 2075 | break; |
92e059d8 | 2076 | |
56622147 | 2077 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2078 | // If we're creating a shared library, a dynamic relocation will |
2079 | // have been created for this location, so do not apply it now. | |
8851ecca | 2080 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2081 | { |
2082 | gold_assert(tls_segment != NULL); | |
2083 | value -= tls_segment->memsz(); | |
2084 | Relocate_functions<32, false>::rel32(view, value); | |
2085 | } | |
56622147 | 2086 | break; |
92e059d8 | 2087 | |
56622147 | 2088 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2089 | // If we're creating a shared library, a dynamic relocation will |
2090 | // have been created for this location, so do not apply it now. | |
8851ecca | 2091 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2092 | { |
2093 | gold_assert(tls_segment != NULL); | |
2094 | value = tls_segment->memsz() - value; | |
2095 | Relocate_functions<32, false>::rel32(view, value); | |
2096 | } | |
56622147 | 2097 | break; |
92e059d8 | 2098 | } |
92e059d8 ILT |
2099 | } |
2100 | ||
e041f13d | 2101 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2102 | // Local-Exec. |
2103 | ||
2104 | inline void | |
2105 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2106 | size_t relnum, | |
2107 | Output_segment* tls_segment, | |
2108 | const elfcpp::Rel<32, false>& rel, | |
2109 | unsigned int, | |
2110 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2111 | unsigned char* view, | |
fe8718a4 | 2112 | section_size_type view_size) |
ead1e424 ILT |
2113 | { |
2114 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2115 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2116 | // leal foo(%reg),%eax; call ___tls_get_addr |
2117 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2118 | ||
af6359d5 ILT |
2119 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2120 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2121 | |
2122 | unsigned char op1 = view[-1]; | |
2123 | unsigned char op2 = view[-2]; | |
2124 | ||
af6359d5 ILT |
2125 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2126 | op2 == 0x8d || op2 == 0x04); | |
2127 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2128 | |
2129 | int roff = 5; | |
2130 | ||
2131 | if (op2 == 0x04) | |
2132 | { | |
af6359d5 ILT |
2133 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2134 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2135 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2136 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2137 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2138 | } | |
2139 | else | |
2140 | { | |
af6359d5 ILT |
2141 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2142 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2143 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2144 | && view[9] == 0x90) |
ead1e424 ILT |
2145 | { |
2146 | // There is a trailing nop. Use the size byte subl. | |
2147 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2148 | roff = 6; | |
2149 | } | |
2150 | else | |
2151 | { | |
2152 | // Use the five byte subl. | |
2153 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2154 | } | |
2155 | } | |
2156 | ||
7bf1f802 | 2157 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2158 | Relocate_functions<32, false>::rel32(view + roff, value); |
2159 | ||
2160 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2161 | // We can skip it. | |
2162 | this->skip_call_tls_get_addr_ = true; | |
2163 | } | |
2164 | ||
7bf1f802 | 2165 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2166 | // Initial-Exec. |
2167 | ||
2168 | inline void | |
2169 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2170 | size_t relnum, | |
c2b45e22 | 2171 | Output_segment*, |
07f397ab ILT |
2172 | const elfcpp::Rel<32, false>& rel, |
2173 | unsigned int, | |
2174 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2175 | unsigned char* view, | |
fe8718a4 | 2176 | section_size_type view_size) |
07f397ab ILT |
2177 | { |
2178 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2179 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2180 | ||
2181 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2182 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2183 | ||
2184 | unsigned char op1 = view[-1]; | |
2185 | unsigned char op2 = view[-2]; | |
2186 | ||
2187 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2188 | op2 == 0x8d || op2 == 0x04); | |
2189 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2190 | ||
2191 | int roff = 5; | |
2192 | ||
c2b45e22 CC |
2193 | // FIXME: For now, support only the first (SIB) form. |
2194 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2195 | |
2196 | if (op2 == 0x04) | |
2197 | { | |
2198 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2199 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2200 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2201 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2202 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2203 | } | |
2204 | else | |
2205 | { | |
2206 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2207 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2208 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2209 | && view[9] == 0x90) |
2210 | { | |
2211 | // FIXME: This is not the right instruction sequence. | |
2212 | // There is a trailing nop. Use the size byte subl. | |
2213 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2214 | roff = 6; | |
2215 | } | |
2216 | else | |
2217 | { | |
2218 | // FIXME: This is not the right instruction sequence. | |
2219 | // Use the five byte subl. | |
2220 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2221 | } | |
2222 | } | |
2223 | ||
07f397ab ILT |
2224 | Relocate_functions<32, false>::rel32(view + roff, value); |
2225 | ||
2226 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2227 | // We can skip it. | |
2228 | this->skip_call_tls_get_addr_ = true; | |
2229 | } | |
2230 | ||
c2b45e22 CC |
2231 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2232 | // General-Dynamic to a Local-Exec. | |
2233 | ||
2234 | inline void | |
2235 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2236 | const Relocate_info<32, false>* relinfo, | |
2237 | size_t relnum, | |
2238 | Output_segment* tls_segment, | |
2239 | const elfcpp::Rel<32, false>& rel, | |
2240 | unsigned int r_type, | |
2241 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2242 | unsigned char* view, | |
2243 | section_size_type view_size) | |
2244 | { | |
2245 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2246 | { | |
2247 | // leal foo@TLSDESC(%ebx), %eax | |
2248 | // ==> leal foo@NTPOFF, %eax | |
2249 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2250 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2251 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2252 | view[-2] == 0x8d && view[-1] == 0x83); | |
2253 | view[-1] = 0x05; | |
2254 | value -= tls_segment->memsz(); | |
2255 | Relocate_functions<32, false>::rel32(view, value); | |
2256 | } | |
2257 | else | |
2258 | { | |
2259 | // call *foo@TLSCALL(%eax) | |
2260 | // ==> nop; nop | |
2261 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2262 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2263 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2264 | view[0] == 0xff && view[1] == 0x10); | |
2265 | view[0] = 0x66; | |
2266 | view[1] = 0x90; | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2271 | // General-Dynamic to an Initial-Exec. | |
2272 | ||
2273 | inline void | |
2274 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2275 | const Relocate_info<32, false>* relinfo, | |
2276 | size_t relnum, | |
2277 | Output_segment*, | |
2278 | const elfcpp::Rel<32, false>& rel, | |
2279 | unsigned int r_type, | |
2280 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2281 | unsigned char* view, | |
2282 | section_size_type view_size) | |
2283 | { | |
2284 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2285 | { | |
2286 | // leal foo@TLSDESC(%ebx), %eax | |
2287 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2288 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2289 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2290 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2291 | view[-2] == 0x8d && view[-1] == 0x83); | |
2292 | view[-2] = 0x8b; | |
2293 | Relocate_functions<32, false>::rel32(view, value); | |
2294 | } | |
2295 | else | |
2296 | { | |
2297 | // call *foo@TLSCALL(%eax) | |
2298 | // ==> nop; nop | |
2299 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2300 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2301 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2302 | view[0] == 0xff && view[1] == 0x10); | |
2303 | view[0] = 0x66; | |
2304 | view[1] = 0x90; | |
2305 | } | |
2306 | } | |
2307 | ||
46cf9fa2 ILT |
2308 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2309 | // Local-Exec. | |
2310 | ||
2311 | inline void | |
2312 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2313 | size_t relnum, | |
2314 | Output_segment*, | |
2315 | const elfcpp::Rel<32, false>& rel, | |
2316 | unsigned int, | |
2317 | elfcpp::Elf_types<32>::Elf_Addr, | |
2318 | unsigned char* view, | |
fe8718a4 | 2319 | section_size_type view_size) |
46cf9fa2 ILT |
2320 | { |
2321 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2322 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2323 | ||
af6359d5 ILT |
2324 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2325 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2326 | |
2327 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2328 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2329 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2330 | |
af6359d5 | 2331 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2332 | |
2333 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2334 | ||
2335 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2336 | // We can skip it. | |
2337 | this->skip_call_tls_get_addr_ = true; | |
2338 | } | |
2339 | ||
56622147 ILT |
2340 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2341 | // Local-Exec. | |
2342 | ||
2343 | inline void | |
2344 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2345 | size_t relnum, | |
2346 | Output_segment* tls_segment, | |
2347 | const elfcpp::Rel<32, false>& rel, | |
2348 | unsigned int r_type, | |
2349 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2350 | unsigned char* view, | |
fe8718a4 | 2351 | section_size_type view_size) |
56622147 ILT |
2352 | { |
2353 | // We have to actually change the instructions, which means that we | |
2354 | // need to examine the opcodes to figure out which instruction we | |
2355 | // are looking at. | |
2356 | if (r_type == elfcpp::R_386_TLS_IE) | |
2357 | { | |
2358 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2359 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2360 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2361 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2362 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2363 | ||
2364 | unsigned char op1 = view[-1]; | |
2365 | if (op1 == 0xa1) | |
2366 | { | |
2367 | // movl XX,%eax ==> movl $YY,%eax | |
2368 | view[-1] = 0xb8; | |
2369 | } | |
2370 | else | |
2371 | { | |
2372 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2373 | ||
2374 | unsigned char op2 = view[-2]; | |
2375 | if (op2 == 0x8b) | |
2376 | { | |
2377 | // movl XX,%reg ==> movl $YY,%reg | |
2378 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2379 | (op1 & 0xc7) == 0x05); | |
2380 | view[-2] = 0xc7; | |
2381 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2382 | } | |
2383 | else if (op2 == 0x03) | |
2384 | { | |
2385 | // addl XX,%reg ==> addl $YY,%reg | |
2386 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2387 | (op1 & 0xc7) == 0x05); | |
2388 | view[-2] = 0x81; | |
2389 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2390 | } | |
2391 | else | |
2392 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2393 | } | |
2394 | } | |
2395 | else | |
2396 | { | |
2397 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2398 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2399 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2400 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2401 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2402 | ||
2403 | unsigned char op1 = view[-1]; | |
2404 | unsigned char op2 = view[-2]; | |
2405 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2406 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2407 | if (op2 == 0x8b) | |
2408 | { | |
2409 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2410 | view[-2] = 0xc7; | |
2411 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2412 | } | |
2413 | else if (op2 == 0x2b) | |
2414 | { | |
2415 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2416 | view[-2] = 0x81; | |
2417 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2418 | } | |
2419 | else if (op2 == 0x03) | |
2420 | { | |
2421 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2422 | view[-2] = 0x81; | |
2423 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2424 | } | |
2425 | else | |
2426 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2427 | } | |
2428 | ||
7bf1f802 | 2429 | value = tls_segment->memsz() - value; |
56622147 ILT |
2430 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2431 | value = - value; | |
2432 | ||
2433 | Relocate_functions<32, false>::rel32(view, value); | |
2434 | } | |
2435 | ||
61ba1cf9 ILT |
2436 | // Relocate section data. |
2437 | ||
2438 | void | |
92e059d8 | 2439 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2440 | unsigned int sh_type, |
2441 | const unsigned char* prelocs, | |
2442 | size_t reloc_count, | |
730cdc88 ILT |
2443 | Output_section* output_section, |
2444 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2445 | unsigned char* view, |
2446 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2447 | section_size_type view_size, |
2448 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2449 | { |
a3ad94ed | 2450 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2451 | |
ead1e424 ILT |
2452 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2453 | Target_i386::Relocate>( | |
92e059d8 | 2454 | relinfo, |
ead1e424 | 2455 | this, |
61ba1cf9 ILT |
2456 | prelocs, |
2457 | reloc_count, | |
730cdc88 ILT |
2458 | output_section, |
2459 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2460 | view, |
2461 | address, | |
364c7fa5 ILT |
2462 | view_size, |
2463 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2464 | } |
2465 | ||
6a74a719 ILT |
2466 | // Return the size of a relocation while scanning during a relocatable |
2467 | // link. | |
2468 | ||
2469 | unsigned int | |
2470 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2471 | unsigned int r_type, | |
2472 | Relobj* object) | |
2473 | { | |
2474 | switch (r_type) | |
2475 | { | |
2476 | case elfcpp::R_386_NONE: | |
2477 | case elfcpp::R_386_GNU_VTINHERIT: | |
2478 | case elfcpp::R_386_GNU_VTENTRY: | |
2479 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2480 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2481 | case elfcpp::R_386_TLS_DESC_CALL: | |
2482 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2483 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2484 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2485 | case elfcpp::R_386_TLS_IE_32: | |
2486 | case elfcpp::R_386_TLS_GOTIE: | |
2487 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2488 | case elfcpp::R_386_TLS_LE_32: | |
2489 | return 0; | |
2490 | ||
2491 | case elfcpp::R_386_32: | |
2492 | case elfcpp::R_386_PC32: | |
2493 | case elfcpp::R_386_GOT32: | |
2494 | case elfcpp::R_386_PLT32: | |
2495 | case elfcpp::R_386_GOTOFF: | |
2496 | case elfcpp::R_386_GOTPC: | |
2497 | return 4; | |
2498 | ||
2499 | case elfcpp::R_386_16: | |
2500 | case elfcpp::R_386_PC16: | |
2501 | return 2; | |
2502 | ||
2503 | case elfcpp::R_386_8: | |
2504 | case elfcpp::R_386_PC8: | |
2505 | return 1; | |
2506 | ||
2507 | // These are relocations which should only be seen by the | |
2508 | // dynamic linker, and should never be seen here. | |
2509 | case elfcpp::R_386_COPY: | |
2510 | case elfcpp::R_386_GLOB_DAT: | |
2511 | case elfcpp::R_386_JUMP_SLOT: | |
2512 | case elfcpp::R_386_RELATIVE: | |
2513 | case elfcpp::R_386_TLS_TPOFF: | |
2514 | case elfcpp::R_386_TLS_DTPMOD32: | |
2515 | case elfcpp::R_386_TLS_DTPOFF32: | |
2516 | case elfcpp::R_386_TLS_TPOFF32: | |
2517 | case elfcpp::R_386_TLS_DESC: | |
2518 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2519 | return 0; | |
2520 | ||
2521 | case elfcpp::R_386_32PLT: | |
2522 | case elfcpp::R_386_TLS_GD_32: | |
2523 | case elfcpp::R_386_TLS_GD_PUSH: | |
2524 | case elfcpp::R_386_TLS_GD_CALL: | |
2525 | case elfcpp::R_386_TLS_GD_POP: | |
2526 | case elfcpp::R_386_TLS_LDM_32: | |
2527 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2528 | case elfcpp::R_386_TLS_LDM_CALL: | |
2529 | case elfcpp::R_386_TLS_LDM_POP: | |
2530 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2531 | default: | |
2532 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2533 | return 0; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | // Scan the relocs during a relocatable link. | |
2538 | ||
2539 | void | |
ad0f2072 | 2540 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2541 | Layout* layout, |
2542 | Sized_relobj<32, false>* object, | |
2543 | unsigned int data_shndx, | |
2544 | unsigned int sh_type, | |
2545 | const unsigned char* prelocs, | |
2546 | size_t reloc_count, | |
2547 | Output_section* output_section, | |
2548 | bool needs_special_offset_handling, | |
2549 | size_t local_symbol_count, | |
2550 | const unsigned char* plocal_symbols, | |
2551 | Relocatable_relocs* rr) | |
2552 | { | |
2553 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2554 | ||
2555 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2556 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2557 | ||
7019cd25 | 2558 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 2559 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2560 | symtab, |
2561 | layout, | |
2562 | object, | |
2563 | data_shndx, | |
2564 | prelocs, | |
2565 | reloc_count, | |
2566 | output_section, | |
2567 | needs_special_offset_handling, | |
2568 | local_symbol_count, | |
2569 | plocal_symbols, | |
2570 | rr); | |
2571 | } | |
2572 | ||
2573 | // Relocate a section during a relocatable link. | |
2574 | ||
2575 | void | |
2576 | Target_i386::relocate_for_relocatable( | |
2577 | const Relocate_info<32, false>* relinfo, | |
2578 | unsigned int sh_type, | |
2579 | const unsigned char* prelocs, | |
2580 | size_t reloc_count, | |
2581 | Output_section* output_section, | |
2582 | off_t offset_in_output_section, | |
2583 | const Relocatable_relocs* rr, | |
2584 | unsigned char* view, | |
2585 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2586 | section_size_type view_size, | |
2587 | unsigned char* reloc_view, | |
2588 | section_size_type reloc_view_size) | |
2589 | { | |
2590 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2591 | ||
7019cd25 | 2592 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2593 | relinfo, |
2594 | prelocs, | |
2595 | reloc_count, | |
2596 | output_section, | |
2597 | offset_in_output_section, | |
2598 | rr, | |
2599 | view, | |
2600 | view_address, | |
2601 | view_size, | |
2602 | reloc_view, | |
2603 | reloc_view_size); | |
2604 | } | |
2605 | ||
ab5c9e90 ILT |
2606 | // Return the value to use for a dynamic which requires special |
2607 | // treatment. This is how we support equality comparisons of function | |
2608 | // pointers across shared library boundaries, as described in the | |
2609 | // processor specific ABI supplement. | |
2610 | ||
2611 | uint64_t | |
2612 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2613 | { | |
2614 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2615 | return this->plt_section()->address() + gsym->plt_offset(); | |
2616 | } | |
2617 | ||
c51e6221 ILT |
2618 | // Return a string used to fill a code section with nops to take up |
2619 | // the specified length. | |
2620 | ||
2621 | std::string | |
8851ecca | 2622 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2623 | { |
2624 | if (length >= 16) | |
2625 | { | |
2626 | // Build a jmp instruction to skip over the bytes. | |
2627 | unsigned char jmp[5]; | |
2628 | jmp[0] = 0xe9; | |
2629 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2630 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2631 | + std::string(length - 5, '\0')); | |
2632 | } | |
2633 | ||
2634 | // Nop sequences of various lengths. | |
2635 | const char nop1[1] = { 0x90 }; // nop | |
2636 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2637 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2638 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2639 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2640 | 0x00 }; // leal 0(%esi,1),%esi | |
2641 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2642 | 0x00, 0x00 }; | |
2643 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2644 | 0x00, 0x00, 0x00 }; | |
2645 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2646 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2647 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2648 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2649 | 0x00 }; | |
2650 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2651 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2652 | 0x00, 0x00 }; | |
2653 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2654 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2655 | 0x00, 0x00, 0x00 }; | |
2656 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2657 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2658 | 0x00, 0x00, 0x00, 0x00 }; | |
2659 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2660 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2661 | 0x27, 0x00, 0x00, 0x00, | |
2662 | 0x00 }; | |
2663 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2664 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2665 | 0xbc, 0x27, 0x00, 0x00, | |
2666 | 0x00, 0x00 }; | |
2667 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2668 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2669 | 0x90, 0x90, 0x90, 0x90, | |
2670 | 0x90, 0x90, 0x90 }; | |
2671 | ||
2672 | const char* nops[16] = { | |
2673 | NULL, | |
2674 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2675 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2676 | }; | |
2677 | ||
2678 | return std::string(nops[length], length); | |
2679 | } | |
2680 | ||
364c7fa5 ILT |
2681 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2682 | // compiled with -fstack-split. The function calls non-stack-split | |
2683 | // code. We have to change the function so that it always ensures | |
2684 | // that it has enough stack space to run some random function. | |
2685 | ||
2686 | void | |
2687 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2688 | section_offset_type fnoffset, | |
2689 | section_size_type fnsize, | |
2690 | unsigned char* view, | |
2691 | section_size_type view_size, | |
2692 | std::string* from, | |
2693 | std::string* to) const | |
2694 | { | |
2695 | // The function starts with a comparison of the stack pointer and a | |
2696 | // field in the TCB. This is followed by a jump. | |
2697 | ||
2698 | // cmp %gs:NN,%esp | |
2699 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
2700 | && fnsize > 7) | |
2701 | { | |
2702 | // We will call __morestack if the carry flag is set after this | |
2703 | // comparison. We turn the comparison into an stc instruction | |
2704 | // and some nops. | |
2705 | view[fnoffset] = '\xf9'; | |
2706 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
2707 | } | |
2708 | // lea NN(%esp),%ecx | |
1782c879 ILT |
2709 | // lea NN(%esp),%edx |
2710 | else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
2711 | || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3)) | |
364c7fa5 ILT |
2712 | && fnsize > 7) |
2713 | { | |
2714 | // This is loading an offset from the stack pointer for a | |
2715 | // comparison. The offset is negative, so we decrease the | |
2716 | // offset by the amount of space we need for the stack. This | |
2717 | // means we will avoid calling __morestack if there happens to | |
2718 | // be plenty of space on the stack already. | |
2719 | unsigned char* pval = view + fnoffset + 3; | |
2720 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2721 | val -= parameters->options().split_stack_adjust_size(); | |
2722 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2723 | } | |
2724 | else | |
2725 | { | |
2726 | if (!object->has_no_split_stack()) | |
2727 | object->error(_("failed to match split-stack sequence at " | |
2728 | "section %u offset %0zx"), | |
ac33a407 | 2729 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2730 | return; |
2731 | } | |
2732 | ||
2733 | // We have to change the function so that it calls | |
2734 | // __morestack_non_split instead of __morestack. The former will | |
2735 | // allocate additional stack space. | |
2736 | *from = "__morestack"; | |
2737 | *to = "__morestack_non_split"; | |
2738 | } | |
2739 | ||
14bfc3f5 ILT |
2740 | // The selector for i386 object files. |
2741 | ||
36959681 | 2742 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
2743 | { |
2744 | public: | |
2745 | Target_selector_i386() | |
36959681 ILT |
2746 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
2747 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
2748 | { } |
2749 | ||
2750 | Target* | |
e96caa79 ILT |
2751 | do_instantiate_target() |
2752 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2753 | }; |
2754 | ||
14bfc3f5 ILT |
2755 | Target_selector_i386 target_selector_i386; |
2756 | ||
2757 | } // End anonymous namespace. |