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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), | |
f5c870d2 | 464 | this->got_, false); |
9f1d377b | 465 | os->set_is_relro(); |
ead1e424 | 466 | |
a3ad94ed ILT |
467 | // The old GNU linker creates a .got.plt section. We just |
468 | // create another set of data in the .got section. Note that we | |
469 | // always create a PLT if we create a GOT, although the PLT | |
470 | // might be empty. | |
7d9e3d98 | 471 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
9f1d377b ILT |
472 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
473 | (elfcpp::SHF_ALLOC | |
474 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 475 | this->got_plt_, false); |
9f1d377b | 476 | os->set_is_relro(); |
a3ad94ed | 477 | |
ead1e424 | 478 | // The first three entries are reserved. |
27bc2bce | 479 | this->got_plt_->set_current_data_size(3 * 4); |
ead1e424 | 480 | |
a3ad94ed | 481 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
9b07f471 | 482 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
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, |
f5c870d2 | 503 | elfcpp::SHF_ALLOC, this->rel_dyn_, true); |
5a6f7e2d ILT |
504 | } |
505 | return this->rel_dyn_; | |
506 | } | |
507 | ||
a3ad94ed ILT |
508 | // A class to handle the PLT data. |
509 | ||
510 | class Output_data_plt_i386 : public Output_section_data | |
511 | { | |
512 | public: | |
513 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section; | |
514 | ||
7e1edb90 | 515 | Output_data_plt_i386(Layout*, Output_data_space*); |
a3ad94ed ILT |
516 | |
517 | // Add an entry to the PLT. | |
518 | void | |
519 | add_entry(Symbol* gsym); | |
520 | ||
16649710 ILT |
521 | // Return the .rel.plt section data. |
522 | const Reloc_section* | |
523 | rel_plt() const | |
524 | { return this->rel_; } | |
525 | ||
526 | protected: | |
527 | void | |
528 | do_adjust_output_section(Output_section* os); | |
529 | ||
7d9e3d98 ILT |
530 | // Write to a map file. |
531 | void | |
532 | do_print_to_mapfile(Mapfile* mapfile) const | |
533 | { mapfile->print_output_data(this, _("** PLT")); } | |
534 | ||
a3ad94ed ILT |
535 | private: |
536 | // The size of an entry in the PLT. | |
537 | static const int plt_entry_size = 16; | |
538 | ||
539 | // The first entry in the PLT for an executable. | |
540 | static unsigned char exec_first_plt_entry[plt_entry_size]; | |
541 | ||
542 | // The first entry in the PLT for a shared object. | |
543 | static unsigned char dyn_first_plt_entry[plt_entry_size]; | |
544 | ||
545 | // Other entries in the PLT for an executable. | |
546 | static unsigned char exec_plt_entry[plt_entry_size]; | |
547 | ||
548 | // Other entries in the PLT for a shared object. | |
549 | static unsigned char dyn_plt_entry[plt_entry_size]; | |
550 | ||
551 | // Set the final size. | |
552 | void | |
27bc2bce | 553 | set_final_data_size() |
a3ad94ed ILT |
554 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
555 | ||
556 | // Write out the PLT data. | |
557 | void | |
558 | do_write(Output_file*); | |
559 | ||
560 | // The reloc section. | |
561 | Reloc_section* rel_; | |
562 | // The .got.plt section. | |
563 | Output_data_space* got_plt_; | |
564 | // The number of PLT entries. | |
565 | unsigned int count_; | |
a3ad94ed ILT |
566 | }; |
567 | ||
568 | // Create the PLT section. The ordinary .got section is an argument, | |
569 | // since we need to refer to the start. We also create our own .got | |
570 | // section just for PLT entries. | |
571 | ||
572 | Output_data_plt_i386::Output_data_plt_i386(Layout* layout, | |
7e1edb90 | 573 | Output_data_space* got_plt) |
80576242 | 574 | : Output_section_data(4), got_plt_(got_plt), count_(0) |
a3ad94ed | 575 | { |
d98bc257 | 576 | this->rel_ = new Reloc_section(false); |
a3ad94ed | 577 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
f5c870d2 | 578 | elfcpp::SHF_ALLOC, this->rel_, true); |
a3ad94ed ILT |
579 | } |
580 | ||
16649710 ILT |
581 | void |
582 | Output_data_plt_i386::do_adjust_output_section(Output_section* os) | |
583 | { | |
584 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
585 | // linker, and so do we. | |
586 | os->set_entsize(4); | |
587 | } | |
588 | ||
a3ad94ed ILT |
589 | // Add an entry to the PLT. |
590 | ||
591 | void | |
592 | Output_data_plt_i386::add_entry(Symbol* gsym) | |
593 | { | |
594 | gold_assert(!gsym->has_plt_offset()); | |
595 | ||
596 | // Note that when setting the PLT offset we skip the initial | |
597 | // reserved PLT entry. | |
598 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
599 | ||
600 | ++this->count_; | |
601 | ||
fe8718a4 | 602 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
a3ad94ed ILT |
603 | |
604 | // Every PLT entry needs a GOT entry which points back to the PLT | |
605 | // entry (this will be changed by the dynamic linker, normally | |
606 | // lazily when the function is called). | |
27bc2bce | 607 | this->got_plt_->set_current_data_size(got_offset + 4); |
a3ad94ed ILT |
608 | |
609 | // Every PLT entry needs a reloc. | |
16649710 | 610 | gsym->set_needs_dynsym_entry(); |
a3ad94ed ILT |
611 | this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_, |
612 | got_offset); | |
613 | ||
614 | // Note that we don't need to save the symbol. The contents of the | |
615 | // PLT are independent of which symbols are used. The symbols only | |
616 | // appear in the relocations. | |
617 | } | |
618 | ||
619 | // The first entry in the PLT for an executable. | |
620 | ||
621 | unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] = | |
622 | { | |
623 | 0xff, 0x35, // pushl contents of memory address | |
624 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
625 | 0xff, 0x25, // jmp indirect | |
626 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
627 | 0, 0, 0, 0 // unused | |
628 | }; | |
629 | ||
630 | // The first entry in the PLT for a shared object. | |
631 | ||
632 | unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] = | |
633 | { | |
634 | 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx) | |
635 | 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx) | |
636 | 0, 0, 0, 0 // unused | |
637 | }; | |
638 | ||
639 | // Subsequent entries in the PLT for an executable. | |
640 | ||
641 | unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] = | |
642 | { | |
643 | 0xff, 0x25, // jmp indirect | |
644 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
645 | 0x68, // pushl immediate | |
646 | 0, 0, 0, 0, // replaced with offset into relocation table | |
647 | 0xe9, // jmp relative | |
648 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
649 | }; | |
650 | ||
651 | // Subsequent entries in the PLT for a shared object. | |
652 | ||
653 | unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] = | |
654 | { | |
655 | 0xff, 0xa3, // jmp *offset(%ebx) | |
656 | 0, 0, 0, 0, // replaced with offset of symbol in .got | |
657 | 0x68, // pushl immediate | |
658 | 0, 0, 0, 0, // replaced with offset into relocation table | |
659 | 0xe9, // jmp relative | |
660 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
661 | }; | |
662 | ||
663 | // Write out the PLT. This uses the hand-coded instructions above, | |
664 | // and adjusts them as needed. This is all specified by the i386 ELF | |
665 | // Processor Supplement. | |
666 | ||
667 | void | |
668 | Output_data_plt_i386::do_write(Output_file* of) | |
669 | { | |
91d6fa6a | 670 | const off_t off = this->offset(); |
fe8718a4 ILT |
671 | const section_size_type oview_size = |
672 | convert_to_section_size_type(this->data_size()); | |
91d6fa6a | 673 | unsigned char* const oview = of->get_output_view(off, oview_size); |
a3ad94ed ILT |
674 | |
675 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
676 | const section_size_type got_size = |
677 | convert_to_section_size_type(this->got_plt_->data_size()); | |
a3ad94ed ILT |
678 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
679 | got_size); | |
680 | ||
681 | unsigned char* pov = oview; | |
682 | ||
683 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
684 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
685 | ||
374ad285 | 686 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
687 | memcpy(pov, dyn_first_plt_entry, plt_entry_size); |
688 | else | |
689 | { | |
690 | memcpy(pov, exec_first_plt_entry, plt_entry_size); | |
691 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4); | |
692 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8); | |
693 | } | |
694 | pov += plt_entry_size; | |
695 | ||
696 | unsigned char* got_pov = got_view; | |
697 | ||
698 | memset(got_pov, 0, 12); | |
699 | got_pov += 12; | |
700 | ||
701 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
702 | ||
703 | unsigned int plt_offset = plt_entry_size; | |
704 | unsigned int plt_rel_offset = 0; | |
705 | unsigned int got_offset = 12; | |
706 | const unsigned int count = this->count_; | |
707 | for (unsigned int i = 0; | |
708 | i < count; | |
709 | ++i, | |
710 | pov += plt_entry_size, | |
711 | got_pov += 4, | |
712 | plt_offset += plt_entry_size, | |
713 | plt_rel_offset += rel_size, | |
714 | got_offset += 4) | |
715 | { | |
716 | // Set and adjust the PLT entry itself. | |
717 | ||
374ad285 | 718 | if (parameters->options().output_is_position_independent()) |
a3ad94ed ILT |
719 | { |
720 | memcpy(pov, dyn_plt_entry, plt_entry_size); | |
721 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
722 | } | |
723 | else | |
724 | { | |
725 | memcpy(pov, exec_plt_entry, plt_entry_size); | |
726 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
727 | (got_address | |
728 | + got_offset)); | |
729 | } | |
730 | ||
731 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset); | |
732 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
733 | - (plt_offset + plt_entry_size)); | |
734 | ||
735 | // Set the entry in the GOT. | |
736 | elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
737 | } | |
738 | ||
fe8718a4 ILT |
739 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
740 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
a3ad94ed | 741 | |
91d6fa6a | 742 | of->write_output_view(off, oview_size, oview); |
a3ad94ed ILT |
743 | of->write_output_view(got_file_offset, got_size, got_view); |
744 | } | |
745 | ||
746 | // Create a PLT entry for a global symbol. | |
747 | ||
748 | void | |
7e1edb90 | 749 | Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym) |
a3ad94ed ILT |
750 | { |
751 | if (gsym->has_plt_offset()) | |
752 | return; | |
753 | ||
754 | if (this->plt_ == NULL) | |
755 | { | |
756 | // Create the GOT sections first. | |
7e1edb90 | 757 | this->got_section(symtab, layout); |
a3ad94ed | 758 | |
7e1edb90 | 759 | this->plt_ = new Output_data_plt_i386(layout, this->got_plt_); |
16649710 ILT |
760 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
761 | (elfcpp::SHF_ALLOC | |
762 | | elfcpp::SHF_EXECINSTR), | |
f5c870d2 | 763 | this->plt_, false); |
a3ad94ed ILT |
764 | } |
765 | ||
766 | this->plt_->add_entry(gsym); | |
767 | } | |
768 | ||
9fa33bee | 769 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
770 | |
771 | void | |
772 | Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
773 | { | |
774 | if (this->tls_base_symbol_defined_) | |
775 | return; | |
776 | ||
777 | Output_segment* tls_segment = layout->tls_segment(); | |
778 | if (tls_segment != NULL) | |
779 | { | |
183fd0e3 | 780 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
781 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
782 | tls_segment, 0, 0, | |
783 | elfcpp::STT_TLS, | |
784 | elfcpp::STB_LOCAL, | |
785 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
786 | (is_exec |
787 | ? Symbol::SEGMENT_END | |
788 | : Symbol::SEGMENT_START), | |
789 | true); | |
edfbb029 CC |
790 | } |
791 | this->tls_base_symbol_defined_ = true; | |
792 | } | |
793 | ||
94c4710f ILT |
794 | // Create a GOT entry for the TLS module index. |
795 | ||
796 | unsigned int | |
797 | Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
798 | Sized_relobj<32, false>* object) | |
799 | { | |
800 | if (this->got_mod_index_offset_ == -1U) | |
801 | { | |
802 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
803 | Reloc_section* rel_dyn = this->rel_dyn_section(layout); | |
804 | Output_data_got<32, false>* got = this->got_section(symtab, layout); | |
805 | unsigned int got_offset = got->add_constant(0); | |
806 | rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got, | |
807 | got_offset); | |
009a67a2 | 808 | got->add_constant(0); |
94c4710f ILT |
809 | this->got_mod_index_offset_ = got_offset; |
810 | } | |
811 | return this->got_mod_index_offset_; | |
812 | } | |
813 | ||
92e059d8 | 814 | // Optimize the TLS relocation type based on what we know about the |
a3ad94ed ILT |
815 | // symbol. IS_FINAL is true if the final address of this symbol is |
816 | // known at link time. | |
92e059d8 | 817 | |
af6359d5 | 818 | tls::Tls_optimization |
7e1edb90 | 819 | Target_i386::optimize_tls_reloc(bool is_final, int r_type) |
92e059d8 ILT |
820 | { |
821 | // If we are generating a shared library, then we can't do anything | |
822 | // in the linker. | |
8851ecca | 823 | if (parameters->options().shared()) |
af6359d5 | 824 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
825 | |
826 | switch (r_type) | |
827 | { | |
828 | case elfcpp::R_386_TLS_GD: | |
829 | case elfcpp::R_386_TLS_GOTDESC: | |
830 | case elfcpp::R_386_TLS_DESC_CALL: | |
e041f13d | 831 | // These are General-Dynamic which permits fully general TLS |
92e059d8 ILT |
832 | // access. Since we know that we are generating an executable, |
833 | // we can convert this to Initial-Exec. If we also know that | |
834 | // this is a local symbol, we can further switch to Local-Exec. | |
a3ad94ed | 835 | if (is_final) |
af6359d5 ILT |
836 | return tls::TLSOPT_TO_LE; |
837 | return tls::TLSOPT_TO_IE; | |
92e059d8 ILT |
838 | |
839 | case elfcpp::R_386_TLS_LDM: | |
840 | // This is Local-Dynamic, which refers to a local symbol in the | |
841 | // dynamic TLS block. Since we know that we generating an | |
842 | // executable, we can switch to Local-Exec. | |
af6359d5 | 843 | return tls::TLSOPT_TO_LE; |
92e059d8 ILT |
844 | |
845 | case elfcpp::R_386_TLS_LDO_32: | |
af6359d5 ILT |
846 | // Another type of Local-Dynamic relocation. |
847 | return tls::TLSOPT_TO_LE; | |
92e059d8 ILT |
848 | |
849 | case elfcpp::R_386_TLS_IE: | |
850 | case elfcpp::R_386_TLS_GOTIE: | |
851 | case elfcpp::R_386_TLS_IE_32: | |
852 | // These are Initial-Exec relocs which get the thread offset | |
853 | // from the GOT. If we know that we are linking against the | |
854 | // local symbol, we can switch to Local-Exec, which links the | |
855 | // thread offset into the instruction. | |
a3ad94ed | 856 | if (is_final) |
af6359d5 ILT |
857 | return tls::TLSOPT_TO_LE; |
858 | return tls::TLSOPT_NONE; | |
8462ae85 | 859 | |
92e059d8 ILT |
860 | case elfcpp::R_386_TLS_LE: |
861 | case elfcpp::R_386_TLS_LE_32: | |
862 | // When we already have Local-Exec, there is nothing further we | |
863 | // can do. | |
af6359d5 | 864 | return tls::TLSOPT_NONE; |
92e059d8 ILT |
865 | |
866 | default: | |
a3ad94ed | 867 | gold_unreachable(); |
92e059d8 ILT |
868 | } |
869 | } | |
870 | ||
af6359d5 ILT |
871 | // Report an unsupported relocation against a local symbol. |
872 | ||
873 | void | |
874 | Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object, | |
875 | unsigned int r_type) | |
876 | { | |
75f2446e ILT |
877 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
878 | object->name().c_str(), r_type); | |
af6359d5 ILT |
879 | } |
880 | ||
92e059d8 ILT |
881 | // Scan a relocation for a local symbol. |
882 | ||
883 | inline void | |
ad0f2072 | 884 | Target_i386::Scan::local(Symbol_table* symtab, |
ead1e424 ILT |
885 | Layout* layout, |
886 | Target_i386* target, | |
f6ce93d6 | 887 | Sized_relobj<32, false>* object, |
1b64748b | 888 | unsigned int data_shndx, |
07f397ab | 889 | Output_section* output_section, |
1b64748b | 890 | const elfcpp::Rel<32, false>& reloc, |
a3ad94ed | 891 | unsigned int r_type, |
7bf1f802 | 892 | const elfcpp::Sym<32, false>& lsym) |
92e059d8 ILT |
893 | { |
894 | switch (r_type) | |
895 | { | |
896 | case elfcpp::R_386_NONE: | |
897 | case elfcpp::R_386_GNU_VTINHERIT: | |
898 | case elfcpp::R_386_GNU_VTENTRY: | |
899 | break; | |
900 | ||
901 | case elfcpp::R_386_32: | |
436ca963 ILT |
902 | // If building a shared library (or a position-independent |
903 | // executable), we need to create a dynamic relocation for | |
904 | // this location. The relocation applied at link time will | |
905 | // apply the link-time value, so we flag the location with | |
906 | // an R_386_RELATIVE relocation so the dynamic loader can | |
907 | // relocate it easily. | |
8851ecca | 908 | if (parameters->options().output_is_position_independent()) |
436ca963 ILT |
909 | { |
910 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
911 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
912 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE, | |
913 | output_section, data_shndx, | |
914 | reloc.get_r_offset()); | |
d61c6bd4 ILT |
915 | } |
916 | break; | |
917 | ||
918 | case elfcpp::R_386_16: | |
919 | case elfcpp::R_386_8: | |
920 | // If building a shared library (or a position-independent | |
921 | // executable), we need to create a dynamic relocation for | |
922 | // this location. Because the addend needs to remain in the | |
923 | // data section, we need to be careful not to apply this | |
924 | // relocation statically. | |
8851ecca | 925 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
926 | { |
927 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
d491d34e | 928 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
dceae3c1 | 929 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
930 | rel_dyn->add_local(object, r_sym, r_type, output_section, |
931 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 ILT |
932 | else |
933 | { | |
934 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
935 | unsigned int shndx = lsym.get_st_shndx(); |
936 | bool is_ordinary; | |
937 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
938 | &is_ordinary); | |
939 | if (!is_ordinary) | |
940 | object->error(_("section symbol %u has bad shndx %u"), | |
941 | r_sym, shndx); | |
942 | else | |
943 | rel_dyn->add_local_section(object, shndx, | |
944 | r_type, output_section, | |
945 | data_shndx, reloc.get_r_offset()); | |
dceae3c1 | 946 | } |
436ca963 | 947 | } |
92e059d8 ILT |
948 | break; |
949 | ||
950 | case elfcpp::R_386_PC32: | |
951 | case elfcpp::R_386_PC16: | |
952 | case elfcpp::R_386_PC8: | |
953 | break; | |
954 | ||
df2efe71 ILT |
955 | case elfcpp::R_386_PLT32: |
956 | // Since we know this is a local symbol, we can handle this as a | |
957 | // PC32 reloc. | |
958 | break; | |
959 | ||
ead1e424 ILT |
960 | case elfcpp::R_386_GOTOFF: |
961 | case elfcpp::R_386_GOTPC: | |
962 | // We need a GOT section. | |
7e1edb90 | 963 | target->got_section(symtab, layout); |
ead1e424 ILT |
964 | break; |
965 | ||
1b64748b ILT |
966 | case elfcpp::R_386_GOT32: |
967 | { | |
968 | // The symbol requires a GOT entry. | |
969 | Output_data_got<32, false>* got = target->got_section(symtab, layout); | |
970 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
0a65a3a7 | 971 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
1b64748b ILT |
972 | { |
973 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 974 | // dynamic RELATIVE relocation for this symbol's GOT entry. |
8851ecca | 975 | if (parameters->options().output_is_position_independent()) |
1b64748b ILT |
976 | { |
977 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
91d6fa6a | 978 | r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
0a65a3a7 CC |
979 | rel_dyn->add_local_relative( |
980 | object, r_sym, elfcpp::R_386_RELATIVE, got, | |
981 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1b64748b ILT |
982 | } |
983 | } | |
984 | } | |
985 | break; | |
986 | ||
af6359d5 ILT |
987 | // These are relocations which should only be seen by the |
988 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
989 | case elfcpp::R_386_COPY: |
990 | case elfcpp::R_386_GLOB_DAT: | |
991 | case elfcpp::R_386_JUMP_SLOT: | |
992 | case elfcpp::R_386_RELATIVE: | |
993 | case elfcpp::R_386_TLS_TPOFF: | |
994 | case elfcpp::R_386_TLS_DTPMOD32: | |
995 | case elfcpp::R_386_TLS_DTPOFF32: | |
996 | case elfcpp::R_386_TLS_TPOFF32: | |
997 | case elfcpp::R_386_TLS_DESC: | |
a0c4fb0a | 998 | gold_error(_("%s: unexpected reloc %u in object file"), |
75f2446e | 999 | object->name().c_str(), r_type); |
92e059d8 ILT |
1000 | break; |
1001 | ||
af6359d5 | 1002 | // These are initial TLS relocs, which are expected when |
d61c17ea | 1003 | // linking. |
56622147 ILT |
1004 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1005 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1006 | case elfcpp::R_386_TLS_DESC_CALL: | |
1007 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1008 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1009 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1010 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1011 | case elfcpp::R_386_TLS_GOTIE: |
1012 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1013 | case elfcpp::R_386_TLS_LE_32: |
7e1edb90 | 1014 | { |
8851ecca | 1015 | bool output_is_shared = parameters->options().shared(); |
af6359d5 ILT |
1016 | const tls::Tls_optimization optimized_type |
1017 | = Target_i386::optimize_tls_reloc(!output_is_shared, r_type); | |
7e1edb90 ILT |
1018 | switch (r_type) |
1019 | { | |
56622147 | 1020 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1021 | if (optimized_type == tls::TLSOPT_NONE) |
1022 | { | |
1023 | // Create a pair of GOT entries for the module index and | |
1024 | // dtv-relative offset. | |
1025 | Output_data_got<32, false>* got | |
1026 | = target->got_section(symtab, layout); | |
1027 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1028 | unsigned int shndx = lsym.get_st_shndx(); |
1029 | bool is_ordinary; | |
1030 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1031 | if (!is_ordinary) | |
1032 | object->error(_("local symbol %u has bad shndx %u"), | |
1033 | r_sym, shndx); | |
1034 | else | |
1035 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1036 | GOT_TYPE_TLS_PAIR, | |
1037 | target->rel_dyn_section(layout), | |
1038 | elfcpp::R_386_TLS_DTPMOD32, 0); | |
07f397ab ILT |
1039 | } |
1040 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1041 | unsupported_reloc_local(object, r_type); | |
1042 | break; | |
1043 | ||
56622147 | 1044 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva) |
edfbb029 | 1045 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1046 | if (optimized_type == tls::TLSOPT_NONE) |
1047 | { | |
1048 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1049 | Output_data_got<32, false>* got | |
1050 | = target->got_section(symtab, layout); | |
1051 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
d491d34e ILT |
1052 | unsigned int shndx = lsym.get_st_shndx(); |
1053 | bool is_ordinary; | |
1054 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1055 | if (!is_ordinary) | |
1056 | object->error(_("local symbol %u has bad shndx %u"), | |
1057 | r_sym, shndx); | |
1058 | else | |
1059 | got->add_local_pair_with_rel(object, r_sym, shndx, | |
1060 | GOT_TYPE_TLS_DESC, | |
1061 | target->rel_dyn_section(layout), | |
1062 | elfcpp::R_386_TLS_DESC, 0); | |
c2b45e22 CC |
1063 | } |
1064 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1065 | unsupported_reloc_local(object, r_type); |
af6359d5 ILT |
1066 | break; |
1067 | ||
c2b45e22 CC |
1068 | case elfcpp::R_386_TLS_DESC_CALL: |
1069 | break; | |
1070 | ||
56622147 | 1071 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1072 | if (optimized_type == tls::TLSOPT_NONE) |
1073 | { | |
1074 | // Create a GOT entry for the module index. | |
94c4710f | 1075 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1076 | } |
1077 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1078 | unsupported_reloc_local(object, r_type); |
1079 | break; | |
1080 | ||
56622147 | 1081 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1082 | break; |
1083 | ||
56622147 ILT |
1084 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1085 | case elfcpp::R_386_TLS_IE_32: | |
1086 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1087 | layout->set_has_static_tls(); |
07f397ab ILT |
1088 | if (optimized_type == tls::TLSOPT_NONE) |
1089 | { | |
7bf1f802 ILT |
1090 | // For the R_386_TLS_IE relocation, we need to create a |
1091 | // dynamic relocation when building a shared library. | |
1092 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1093 | && parameters->options().shared()) |
7bf1f802 ILT |
1094 | { |
1095 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1096 | unsigned int r_sym |
1097 | = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
1098 | rel_dyn->add_local_relative(object, r_sym, | |
1099 | elfcpp::R_386_RELATIVE, | |
1100 | output_section, data_shndx, | |
1101 | reloc.get_r_offset()); | |
7bf1f802 | 1102 | } |
07f397ab ILT |
1103 | // Create a GOT entry for the tp-relative offset. |
1104 | Output_data_got<32, false>* got | |
1105 | = target->got_section(symtab, layout); | |
1106 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
7bf1f802 ILT |
1107 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1108 | ? elfcpp::R_386_TLS_TPOFF32 | |
1109 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1110 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1111 | ? GOT_TYPE_TLS_OFFSET | |
1112 | : GOT_TYPE_TLS_NOFFSET); | |
1113 | got->add_local_with_rel(object, r_sym, got_type, | |
7bf1f802 ILT |
1114 | target->rel_dyn_section(layout), |
1115 | dyn_r_type); | |
07f397ab ILT |
1116 | } |
1117 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1118 | unsupported_reloc_local(object, r_type); |
7e1edb90 | 1119 | break; |
af6359d5 | 1120 | |
56622147 ILT |
1121 | case elfcpp::R_386_TLS_LE: // Local-exec |
1122 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1123 | layout->set_has_static_tls(); |
07f397ab | 1124 | if (output_is_shared) |
7bf1f802 ILT |
1125 | { |
1126 | // We need to create a dynamic relocation. | |
dceae3c1 | 1127 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
7bf1f802 ILT |
1128 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
1129 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1130 | ? elfcpp::R_386_TLS_TPOFF32 | |
1131 | : elfcpp::R_386_TLS_TPOFF); | |
1132 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1133 | rel_dyn->add_local(object, r_sym, dyn_r_type, output_section, | |
1134 | data_shndx, reloc.get_r_offset()); | |
1135 | } | |
56622147 ILT |
1136 | break; |
1137 | ||
af6359d5 ILT |
1138 | default: |
1139 | gold_unreachable(); | |
7e1edb90 ILT |
1140 | } |
1141 | } | |
92e059d8 ILT |
1142 | break; |
1143 | ||
92e059d8 ILT |
1144 | case elfcpp::R_386_32PLT: |
1145 | case elfcpp::R_386_TLS_GD_32: | |
1146 | case elfcpp::R_386_TLS_GD_PUSH: | |
1147 | case elfcpp::R_386_TLS_GD_CALL: | |
1148 | case elfcpp::R_386_TLS_GD_POP: | |
1149 | case elfcpp::R_386_TLS_LDM_32: | |
1150 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1151 | case elfcpp::R_386_TLS_LDM_CALL: | |
1152 | case elfcpp::R_386_TLS_LDM_POP: | |
1153 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1154 | default: | |
af6359d5 | 1155 | unsupported_reloc_local(object, r_type); |
92e059d8 ILT |
1156 | break; |
1157 | } | |
1158 | } | |
1159 | ||
af6359d5 ILT |
1160 | // Report an unsupported relocation against a global symbol. |
1161 | ||
1162 | void | |
1163 | Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object, | |
1164 | unsigned int r_type, | |
1165 | Symbol* gsym) | |
1166 | { | |
75f2446e | 1167 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1168 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
af6359d5 ILT |
1169 | } |
1170 | ||
92e059d8 ILT |
1171 | // Scan a relocation for a global symbol. |
1172 | ||
1173 | inline void | |
ad0f2072 | 1174 | Target_i386::Scan::global(Symbol_table* symtab, |
ead1e424 ILT |
1175 | Layout* layout, |
1176 | Target_i386* target, | |
f6ce93d6 | 1177 | Sized_relobj<32, false>* object, |
a3ad94ed | 1178 | unsigned int data_shndx, |
07f397ab | 1179 | Output_section* output_section, |
a3ad94ed ILT |
1180 | const elfcpp::Rel<32, false>& reloc, |
1181 | unsigned int r_type, | |
92e059d8 ILT |
1182 | Symbol* gsym) |
1183 | { | |
1184 | switch (r_type) | |
1185 | { | |
1186 | case elfcpp::R_386_NONE: | |
1187 | case elfcpp::R_386_GNU_VTINHERIT: | |
8462ae85 | 1188 | case elfcpp::R_386_GNU_VTENTRY: |
92e059d8 ILT |
1189 | break; |
1190 | ||
1191 | case elfcpp::R_386_32: | |
92e059d8 | 1192 | case elfcpp::R_386_16: |
92e059d8 | 1193 | case elfcpp::R_386_8: |
96f2030e | 1194 | { |
d61c6bd4 ILT |
1195 | // Make a PLT entry if necessary. |
1196 | if (gsym->needs_plt_entry()) | |
1197 | { | |
1198 | target->make_plt_entry(symtab, layout, gsym); | |
1199 | // Since this is not a PC-relative relocation, we may be | |
1200 | // taking the address of a function. In that case we need to | |
1201 | // set the entry in the dynamic symbol table to the address of | |
1202 | // the PLT entry. | |
8851ecca | 1203 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1204 | gsym->set_needs_dynsym_value(); |
1205 | } | |
1206 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1207 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1208 | { |
966d4097 | 1209 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1210 | { |
12c0daef | 1211 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1212 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1213 | } |
1214 | else if (r_type == elfcpp::R_386_32 | |
1215 | && gsym->can_use_relative_reloc(false)) | |
1216 | { | |
1217 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
e8c846c3 ILT |
1218 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1219 | output_section, object, | |
1220 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1221 | } |
1222 | else | |
1223 | { | |
96f2030e | 1224 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4f4c5f80 ILT |
1225 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1226 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 ILT |
1227 | } |
1228 | } | |
1229 | } | |
1230 | break; | |
1231 | ||
1232 | case elfcpp::R_386_PC32: | |
1233 | case elfcpp::R_386_PC16: | |
1234 | case elfcpp::R_386_PC8: | |
1235 | { | |
1236 | // Make a PLT entry if necessary. | |
1237 | if (gsym->needs_plt_entry()) | |
7bf1f802 ILT |
1238 | { |
1239 | // These relocations are used for function calls only in | |
1240 | // non-PIC code. For a 32-bit relocation in a shared library, | |
1241 | // we'll need a text relocation anyway, so we can skip the | |
1242 | // PLT entry and let the dynamic linker bind the call directly | |
1243 | // to the target. For smaller relocations, we should use a | |
1244 | // PLT entry to ensure that the call can reach. | |
8851ecca | 1245 | if (!parameters->options().shared() |
7bf1f802 ILT |
1246 | || r_type != elfcpp::R_386_PC32) |
1247 | target->make_plt_entry(symtab, layout, gsym); | |
1248 | } | |
d61c6bd4 | 1249 | // Make a dynamic relocation if necessary. |
0700cf32 | 1250 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1251 | if (gsym->is_func()) |
0700cf32 ILT |
1252 | flags |= Symbol::FUNCTION_CALL; |
1253 | if (gsym->needs_dynamic_reloc(flags)) | |
96f2030e | 1254 | { |
966d4097 | 1255 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1256 | { |
12c0daef | 1257 | target->copy_reloc(symtab, layout, object, |
4f4c5f80 | 1258 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1259 | } |
86849f1f | 1260 | else |
d61c6bd4 ILT |
1261 | { |
1262 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
4f4c5f80 ILT |
1263 | rel_dyn->add_global(gsym, r_type, output_section, object, |
1264 | data_shndx, reloc.get_r_offset()); | |
d61c6bd4 | 1265 | } |
96f2030e ILT |
1266 | } |
1267 | } | |
92e059d8 ILT |
1268 | break; |
1269 | ||
ead1e424 | 1270 | case elfcpp::R_386_GOT32: |
8462ae85 ILT |
1271 | { |
1272 | // The symbol requires a GOT entry. | |
7e1edb90 | 1273 | Output_data_got<32, false>* got = target->got_section(symtab, layout); |
7bf1f802 | 1274 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1275 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1276 | else |
1277 | { | |
8462ae85 | 1278 | // If this symbol is not fully resolved, we need to add a |
7bf1f802 ILT |
1279 | // GOT entry with a dynamic relocation. |
1280 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8fc19601 ILT |
1281 | if (gsym->is_from_dynobj() |
1282 | || gsym->is_undefined() | |
1283 | || gsym->is_preemptible()) | |
0a65a3a7 CC |
1284 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
1285 | rel_dyn, elfcpp::R_386_GLOB_DAT); | |
7bf1f802 | 1286 | else |
8462ae85 | 1287 | { |
0a65a3a7 CC |
1288 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1289 | rel_dyn->add_global_relative( | |
1290 | gsym, elfcpp::R_386_RELATIVE, got, | |
1291 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
8462ae85 ILT |
1292 | } |
1293 | } | |
1294 | } | |
ead1e424 ILT |
1295 | break; |
1296 | ||
1297 | case elfcpp::R_386_PLT32: | |
a3ad94ed ILT |
1298 | // If the symbol is fully resolved, this is just a PC32 reloc. |
1299 | // Otherwise we need a PLT entry. | |
7e1edb90 | 1300 | if (gsym->final_value_is_known()) |
ead1e424 | 1301 | break; |
436ca963 ILT |
1302 | // If building a shared library, we can also skip the PLT entry |
1303 | // if the symbol is defined in the output file and is protected | |
1304 | // or hidden. | |
1305 | if (gsym->is_defined() | |
1306 | && !gsym->is_from_dynobj() | |
1307 | && !gsym->is_preemptible()) | |
1308 | break; | |
7e1edb90 | 1309 | target->make_plt_entry(symtab, layout, gsym); |
ead1e424 ILT |
1310 | break; |
1311 | ||
1312 | case elfcpp::R_386_GOTOFF: | |
1313 | case elfcpp::R_386_GOTPC: | |
1314 | // We need a GOT section. | |
7e1edb90 | 1315 | target->got_section(symtab, layout); |
ead1e424 ILT |
1316 | break; |
1317 | ||
af6359d5 ILT |
1318 | // These are relocations which should only be seen by the |
1319 | // dynamic linker, and should never be seen here. | |
92e059d8 ILT |
1320 | case elfcpp::R_386_COPY: |
1321 | case elfcpp::R_386_GLOB_DAT: | |
1322 | case elfcpp::R_386_JUMP_SLOT: | |
1323 | case elfcpp::R_386_RELATIVE: | |
1324 | case elfcpp::R_386_TLS_TPOFF: | |
1325 | case elfcpp::R_386_TLS_DTPMOD32: | |
1326 | case elfcpp::R_386_TLS_DTPOFF32: | |
1327 | case elfcpp::R_386_TLS_TPOFF32: | |
1328 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1329 | gold_error(_("%s: unexpected reloc %u in object file"), |
1330 | object->name().c_str(), r_type); | |
92e059d8 ILT |
1331 | break; |
1332 | ||
d61c17ea ILT |
1333 | // These are initial tls relocs, which are expected when |
1334 | // linking. | |
56622147 ILT |
1335 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1336 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1337 | case elfcpp::R_386_TLS_DESC_CALL: | |
1338 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1339 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1340 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1341 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1342 | case elfcpp::R_386_TLS_GOTIE: |
1343 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1344 | case elfcpp::R_386_TLS_LE_32: |
a3ad94ed | 1345 | { |
7e1edb90 | 1346 | const bool is_final = gsym->final_value_is_known(); |
af6359d5 ILT |
1347 | const tls::Tls_optimization optimized_type |
1348 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
a3ad94ed ILT |
1349 | switch (r_type) |
1350 | { | |
56622147 | 1351 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
07f397ab ILT |
1352 | if (optimized_type == tls::TLSOPT_NONE) |
1353 | { | |
1354 | // Create a pair of GOT entries for the module index and | |
1355 | // dtv-relative offset. | |
1356 | Output_data_got<32, false>* got | |
1357 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1358 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
7bf1f802 ILT |
1359 | target->rel_dyn_section(layout), |
1360 | elfcpp::R_386_TLS_DTPMOD32, | |
1361 | elfcpp::R_386_TLS_DTPOFF32); | |
07f397ab ILT |
1362 | } |
1363 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1364 | { | |
1365 | // Create a GOT entry for the tp-relative offset. | |
1366 | Output_data_got<32, false>* got | |
1367 | = target->got_section(symtab, layout); | |
c2b45e22 | 1368 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, |
0a65a3a7 | 1369 | target->rel_dyn_section(layout), |
c2b45e22 | 1370 | elfcpp::R_386_TLS_TPOFF); |
07f397ab ILT |
1371 | } |
1372 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1373 | unsupported_reloc_global(object, r_type, gsym); | |
1374 | break; | |
1375 | ||
56622147 | 1376 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url) |
edfbb029 | 1377 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1378 | if (optimized_type == tls::TLSOPT_NONE) |
1379 | { | |
1380 | // Create a double GOT entry with an R_386_TLS_DESC reloc. | |
1381 | Output_data_got<32, false>* got | |
1382 | = target->got_section(symtab, layout); | |
1383 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, | |
1384 | target->rel_dyn_section(layout), | |
1385 | elfcpp::R_386_TLS_DESC, 0); | |
1386 | } | |
1387 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1388 | { | |
1389 | // Create a GOT entry for the tp-relative offset. | |
1390 | Output_data_got<32, false>* got | |
1391 | = target->got_section(symtab, layout); | |
1392 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET, | |
1393 | target->rel_dyn_section(layout), | |
1394 | elfcpp::R_386_TLS_TPOFF); | |
1395 | } | |
1396 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 1397 | unsupported_reloc_global(object, r_type, gsym); |
c2b45e22 CC |
1398 | break; |
1399 | ||
1400 | case elfcpp::R_386_TLS_DESC_CALL: | |
af6359d5 ILT |
1401 | break; |
1402 | ||
56622147 | 1403 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
07f397ab ILT |
1404 | if (optimized_type == tls::TLSOPT_NONE) |
1405 | { | |
1406 | // Create a GOT entry for the module index. | |
94c4710f | 1407 | target->got_mod_index_entry(symtab, layout, object); |
07f397ab ILT |
1408 | } |
1409 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 ILT |
1410 | unsupported_reloc_global(object, r_type, gsym); |
1411 | break; | |
1412 | ||
56622147 | 1413 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
46cf9fa2 ILT |
1414 | break; |
1415 | ||
56622147 ILT |
1416 | case elfcpp::R_386_TLS_IE: // Initial-exec |
1417 | case elfcpp::R_386_TLS_IE_32: | |
1418 | case elfcpp::R_386_TLS_GOTIE: | |
535890bb | 1419 | layout->set_has_static_tls(); |
07f397ab ILT |
1420 | if (optimized_type == tls::TLSOPT_NONE) |
1421 | { | |
7bf1f802 ILT |
1422 | // For the R_386_TLS_IE relocation, we need to create a |
1423 | // dynamic relocation when building a shared library. | |
1424 | if (r_type == elfcpp::R_386_TLS_IE | |
8851ecca | 1425 | && parameters->options().shared()) |
07f397ab | 1426 | { |
07f397ab | 1427 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
e8c846c3 ILT |
1428 | rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE, |
1429 | output_section, object, | |
1430 | data_shndx, | |
1431 | reloc.get_r_offset()); | |
07f397ab | 1432 | } |
7bf1f802 ILT |
1433 | // Create a GOT entry for the tp-relative offset. |
1434 | Output_data_got<32, false>* got | |
1435 | = target->got_section(symtab, layout); | |
1436 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32 | |
1437 | ? elfcpp::R_386_TLS_TPOFF32 | |
1438 | : elfcpp::R_386_TLS_TPOFF); | |
c2b45e22 CC |
1439 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
1440 | ? GOT_TYPE_TLS_OFFSET | |
1441 | : GOT_TYPE_TLS_NOFFSET); | |
1442 | got->add_global_with_rel(gsym, got_type, | |
7bf1f802 ILT |
1443 | target->rel_dyn_section(layout), |
1444 | dyn_r_type); | |
07f397ab ILT |
1445 | } |
1446 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
af6359d5 | 1447 | unsupported_reloc_global(object, r_type, gsym); |
a3ad94ed | 1448 | break; |
af6359d5 | 1449 | |
56622147 ILT |
1450 | case elfcpp::R_386_TLS_LE: // Local-exec |
1451 | case elfcpp::R_386_TLS_LE_32: | |
535890bb | 1452 | layout->set_has_static_tls(); |
8851ecca | 1453 | if (parameters->options().shared()) |
7bf1f802 ILT |
1454 | { |
1455 | // We need to create a dynamic relocation. | |
1456 | unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32 | |
1457 | ? elfcpp::R_386_TLS_TPOFF32 | |
1458 | : elfcpp::R_386_TLS_TPOFF); | |
1459 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
1460 | rel_dyn->add_global(gsym, dyn_r_type, output_section, object, | |
1461 | data_shndx, reloc.get_r_offset()); | |
1462 | } | |
56622147 ILT |
1463 | break; |
1464 | ||
af6359d5 ILT |
1465 | default: |
1466 | gold_unreachable(); | |
a3ad94ed ILT |
1467 | } |
1468 | } | |
92e059d8 ILT |
1469 | break; |
1470 | ||
92e059d8 ILT |
1471 | case elfcpp::R_386_32PLT: |
1472 | case elfcpp::R_386_TLS_GD_32: | |
1473 | case elfcpp::R_386_TLS_GD_PUSH: | |
1474 | case elfcpp::R_386_TLS_GD_CALL: | |
1475 | case elfcpp::R_386_TLS_GD_POP: | |
1476 | case elfcpp::R_386_TLS_LDM_32: | |
1477 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1478 | case elfcpp::R_386_TLS_LDM_CALL: | |
1479 | case elfcpp::R_386_TLS_LDM_POP: | |
1480 | case elfcpp::R_386_USED_BY_INTEL_200: | |
1481 | default: | |
af6359d5 | 1482 | unsupported_reloc_global(object, r_type, gsym); |
92e059d8 ILT |
1483 | break; |
1484 | } | |
1485 | } | |
1486 | ||
6d03d481 ST |
1487 | // Process relocations for gc. |
1488 | ||
1489 | void | |
ad0f2072 | 1490 | Target_i386::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1491 | Layout* layout, |
1492 | Sized_relobj<32, false>* object, | |
1493 | unsigned int data_shndx, | |
1494 | unsigned int, | |
1495 | const unsigned char* prelocs, | |
1496 | size_t reloc_count, | |
1497 | Output_section* output_section, | |
1498 | bool needs_special_offset_handling, | |
1499 | size_t local_symbol_count, | |
1500 | const unsigned char* plocal_symbols) | |
1501 | { | |
1502 | gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL, | |
1503 | Target_i386::Scan>( | |
6d03d481 ST |
1504 | symtab, |
1505 | layout, | |
1506 | this, | |
1507 | object, | |
1508 | data_shndx, | |
1509 | prelocs, | |
1510 | reloc_count, | |
1511 | output_section, | |
1512 | needs_special_offset_handling, | |
1513 | local_symbol_count, | |
1514 | plocal_symbols); | |
1515 | } | |
1516 | ||
92e059d8 ILT |
1517 | // Scan relocations for a section. |
1518 | ||
1519 | void | |
ad0f2072 | 1520 | Target_i386::scan_relocs(Symbol_table* symtab, |
ead1e424 | 1521 | Layout* layout, |
f6ce93d6 | 1522 | Sized_relobj<32, false>* object, |
a3ad94ed | 1523 | unsigned int data_shndx, |
92e059d8 ILT |
1524 | unsigned int sh_type, |
1525 | const unsigned char* prelocs, | |
1526 | size_t reloc_count, | |
730cdc88 ILT |
1527 | Output_section* output_section, |
1528 | bool needs_special_offset_handling, | |
92e059d8 | 1529 | size_t local_symbol_count, |
730cdc88 | 1530 | const unsigned char* plocal_symbols) |
92e059d8 ILT |
1531 | { |
1532 | if (sh_type == elfcpp::SHT_RELA) | |
1533 | { | |
75f2446e ILT |
1534 | gold_error(_("%s: unsupported RELA reloc section"), |
1535 | object->name().c_str()); | |
1536 | return; | |
92e059d8 ILT |
1537 | } |
1538 | ||
ead1e424 ILT |
1539 | gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL, |
1540 | Target_i386::Scan>( | |
92e059d8 | 1541 | symtab, |
ead1e424 ILT |
1542 | layout, |
1543 | this, | |
92e059d8 | 1544 | object, |
a3ad94ed | 1545 | data_shndx, |
92e059d8 ILT |
1546 | prelocs, |
1547 | reloc_count, | |
730cdc88 ILT |
1548 | output_section, |
1549 | needs_special_offset_handling, | |
92e059d8 | 1550 | local_symbol_count, |
730cdc88 | 1551 | plocal_symbols); |
92e059d8 ILT |
1552 | } |
1553 | ||
16649710 | 1554 | // Finalize the sections. |
5a6f7e2d ILT |
1555 | |
1556 | void | |
f59f41f3 DK |
1557 | Target_i386::do_finalize_sections( |
1558 | Layout* layout, | |
1559 | const Input_objects*, | |
1560 | Symbol_table*) | |
5a6f7e2d | 1561 | { |
16649710 ILT |
1562 | // Fill in some more dynamic tags. |
1563 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1564 | if (odyn != NULL) | |
1565 | { | |
22b127cc ILT |
1566 | if (this->got_plt_ != NULL |
1567 | && this->got_plt_->output_section() != NULL) | |
16649710 ILT |
1568 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); |
1569 | ||
22b127cc ILT |
1570 | if (this->plt_ != NULL |
1571 | && this->plt_->output_section() != NULL) | |
16649710 ILT |
1572 | { |
1573 | const Output_data* od = this->plt_->rel_plt(); | |
1574 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1575 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1576 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
1577 | } | |
1578 | ||
22b127cc ILT |
1579 | if (this->rel_dyn_ != NULL |
1580 | && this->rel_dyn_->output_section() != NULL) | |
16649710 ILT |
1581 | { |
1582 | const Output_data* od = this->rel_dyn_; | |
1583 | odyn->add_section_address(elfcpp::DT_REL, od); | |
1584 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
1585 | odyn->add_constant(elfcpp::DT_RELENT, | |
1586 | elfcpp::Elf_sizes<32>::rel_size); | |
1587 | } | |
1588 | ||
8851ecca | 1589 | if (!parameters->options().shared()) |
16649710 ILT |
1590 | { |
1591 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1592 | // linker at run time, and used by the debugger. | |
1593 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1598 | // relocs. | |
12c0daef ILT |
1599 | if (this->copy_relocs_.any_saved_relocs()) |
1600 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
5a6f7e2d ILT |
1601 | } |
1602 | ||
86849f1f ILT |
1603 | // Return whether a direct absolute static relocation needs to be applied. |
1604 | // In cases where Scan::local() or Scan::global() has created | |
1605 | // a dynamic relocation other than R_386_RELATIVE, the addend | |
1606 | // of the relocation is carried in the data, and we must not | |
1607 | // apply the static relocation. | |
1608 | ||
1609 | inline bool | |
1610 | Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
0700cf32 | 1611 | int ref_flags, |
031cdbed ILT |
1612 | bool is_32bit, |
1613 | Output_section* output_section) | |
86849f1f | 1614 | { |
031cdbed ILT |
1615 | // If the output section is not allocated, then we didn't call |
1616 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
1617 | // the reloc here. | |
1618 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
1619 | return true; | |
1620 | ||
d61c6bd4 ILT |
1621 | // For local symbols, we will have created a non-RELATIVE dynamic |
1622 | // relocation only if (a) the output is position independent, | |
1623 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
1624 | // (c) the relocation is not 32 bits wide. | |
86849f1f | 1625 | if (gsym == NULL) |
8851ecca | 1626 | return !(parameters->options().output_is_position_independent() |
0700cf32 | 1627 | && (ref_flags & Symbol::ABSOLUTE_REF) |
d61c6bd4 | 1628 | && !is_32bit); |
86849f1f | 1629 | |
0700cf32 ILT |
1630 | // For global symbols, we use the same helper routines used in the |
1631 | // scan pass. If we did not create a dynamic relocation, or if we | |
1632 | // created a RELATIVE dynamic relocation, we should apply the static | |
1633 | // relocation. | |
1634 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
1635 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
1636 | && gsym->can_use_relative_reloc(ref_flags | |
1637 | & Symbol::FUNCTION_CALL); | |
1638 | return !has_dyn || is_rel; | |
86849f1f ILT |
1639 | } |
1640 | ||
61ba1cf9 ILT |
1641 | // Perform a relocation. |
1642 | ||
ead1e424 | 1643 | inline bool |
92e059d8 | 1644 | Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo, |
ead1e424 | 1645 | Target_i386* target, |
031cdbed | 1646 | Output_section *output_section, |
92e059d8 ILT |
1647 | size_t relnum, |
1648 | const elfcpp::Rel<32, false>& rel, | |
1649 | unsigned int r_type, | |
c06b7b0b | 1650 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1651 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1652 | unsigned char* view, |
1653 | elfcpp::Elf_types<32>::Elf_Addr address, | |
fe8718a4 | 1654 | section_size_type view_size) |
61ba1cf9 | 1655 | { |
ead1e424 ILT |
1656 | if (this->skip_call_tls_get_addr_) |
1657 | { | |
5efc7cd2 CC |
1658 | if ((r_type != elfcpp::R_386_PLT32 |
1659 | && r_type != elfcpp::R_386_PC32) | |
ead1e424 ILT |
1660 | || gsym == NULL |
1661 | || strcmp(gsym->name(), "___tls_get_addr") != 0) | |
75f2446e ILT |
1662 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1663 | _("missing expected TLS relocation")); | |
1664 | else | |
ead1e424 | 1665 | { |
75f2446e ILT |
1666 | this->skip_call_tls_get_addr_ = false; |
1667 | return false; | |
ead1e424 | 1668 | } |
ead1e424 ILT |
1669 | } |
1670 | ||
a3ad94ed | 1671 | // Pick the value to use for symbols defined in shared objects. |
b8e6aad9 | 1672 | Symbol_value<32> symval; |
436ca963 | 1673 | if (gsym != NULL |
de4c45bd ILT |
1674 | && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8 |
1675 | || r_type == elfcpp::R_386_PC16 | |
1676 | || r_type == elfcpp::R_386_PC32)) | |
a3ad94ed | 1677 | { |
b8e6aad9 ILT |
1678 | symval.set_output_value(target->plt_section()->address() |
1679 | + gsym->plt_offset()); | |
1680 | psymval = &symval; | |
a3ad94ed ILT |
1681 | } |
1682 | ||
b8e6aad9 ILT |
1683 | const Sized_relobj<32, false>* object = relinfo->object; |
1684 | ||
1b64748b | 1685 | // Get the GOT offset if needed. |
96f2030e ILT |
1686 | // The GOT pointer points to the end of the GOT section. |
1687 | // We need to subtract the size of the GOT section to get | |
1688 | // the actual offset to use in the relocation. | |
1b64748b ILT |
1689 | bool have_got_offset = false; |
1690 | unsigned int got_offset = 0; | |
1691 | switch (r_type) | |
1692 | { | |
1693 | case elfcpp::R_386_GOT32: | |
1694 | if (gsym != NULL) | |
1695 | { | |
0a65a3a7 CC |
1696 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1697 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
1698 | - target->got_size()); | |
1b64748b ILT |
1699 | } |
1700 | else | |
1701 | { | |
1702 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
0a65a3a7 CC |
1703 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1704 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1705 | - target->got_size()); | |
1b64748b ILT |
1706 | } |
1707 | have_got_offset = true; | |
1708 | break; | |
1709 | ||
1710 | default: | |
1711 | break; | |
1712 | } | |
1713 | ||
61ba1cf9 ILT |
1714 | switch (r_type) |
1715 | { | |
1716 | case elfcpp::R_386_NONE: | |
92e059d8 ILT |
1717 | case elfcpp::R_386_GNU_VTINHERIT: |
1718 | case elfcpp::R_386_GNU_VTENTRY: | |
61ba1cf9 ILT |
1719 | break; |
1720 | ||
1721 | case elfcpp::R_386_32: | |
031cdbed ILT |
1722 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, |
1723 | output_section)) | |
86849f1f | 1724 | Relocate_functions<32, false>::rel32(view, object, psymval); |
61ba1cf9 ILT |
1725 | break; |
1726 | ||
1727 | case elfcpp::R_386_PC32: | |
d61c6bd4 | 1728 | { |
0700cf32 | 1729 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1730 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1731 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1732 | if (should_apply_static_reloc(gsym, ref_flags, true, output_section)) |
d61c6bd4 ILT |
1733 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
1734 | } | |
92e059d8 ILT |
1735 | break; |
1736 | ||
1737 | case elfcpp::R_386_16: | |
031cdbed ILT |
1738 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1739 | output_section)) | |
86849f1f | 1740 | Relocate_functions<32, false>::rel16(view, object, psymval); |
92e059d8 ILT |
1741 | break; |
1742 | ||
1743 | case elfcpp::R_386_PC16: | |
d61c6bd4 | 1744 | { |
0700cf32 | 1745 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1746 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1747 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed | 1748 | if (should_apply_static_reloc(gsym, ref_flags, false, output_section)) |
d09e9154 | 1749 | Relocate_functions<32, false>::pcrel16(view, object, psymval, address); |
d61c6bd4 | 1750 | } |
61ba1cf9 ILT |
1751 | break; |
1752 | ||
92e059d8 | 1753 | case elfcpp::R_386_8: |
031cdbed ILT |
1754 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, |
1755 | output_section)) | |
86849f1f | 1756 | Relocate_functions<32, false>::rel8(view, object, psymval); |
92e059d8 ILT |
1757 | break; |
1758 | ||
1759 | case elfcpp::R_386_PC8: | |
d61c6bd4 | 1760 | { |
0700cf32 | 1761 | int ref_flags = Symbol::NON_PIC_REF; |
53d7974c | 1762 | if (gsym != NULL && gsym->is_func()) |
0700cf32 | 1763 | ref_flags |= Symbol::FUNCTION_CALL; |
031cdbed ILT |
1764 | if (should_apply_static_reloc(gsym, ref_flags, false, |
1765 | output_section)) | |
d09e9154 | 1766 | Relocate_functions<32, false>::pcrel8(view, object, psymval, address); |
d61c6bd4 | 1767 | } |
92e059d8 ILT |
1768 | break; |
1769 | ||
ead1e424 | 1770 | case elfcpp::R_386_PLT32: |
df2efe71 ILT |
1771 | gold_assert(gsym == NULL |
1772 | || gsym->has_plt_offset() | |
99f8faca ILT |
1773 | || gsym->final_value_is_known() |
1774 | || (gsym->is_defined() | |
1775 | && !gsym->is_from_dynobj() | |
1776 | && !gsym->is_preemptible())); | |
b8e6aad9 | 1777 | Relocate_functions<32, false>::pcrel32(view, object, psymval, address); |
ead1e424 ILT |
1778 | break; |
1779 | ||
1780 | case elfcpp::R_386_GOT32: | |
1b64748b ILT |
1781 | gold_assert(have_got_offset); |
1782 | Relocate_functions<32, false>::rel32(view, got_offset); | |
ead1e424 ILT |
1783 | break; |
1784 | ||
1785 | case elfcpp::R_386_GOTOFF: | |
b8e6aad9 ILT |
1786 | { |
1787 | elfcpp::Elf_types<32>::Elf_Addr value; | |
1788 | value = (psymval->value(object, 0) | |
96f2030e | 1789 | - target->got_plt_section()->address()); |
b8e6aad9 ILT |
1790 | Relocate_functions<32, false>::rel32(view, value); |
1791 | } | |
ead1e424 ILT |
1792 | break; |
1793 | ||
1794 | case elfcpp::R_386_GOTPC: | |
b8e6aad9 ILT |
1795 | { |
1796 | elfcpp::Elf_types<32>::Elf_Addr value; | |
96f2030e | 1797 | value = target->got_plt_section()->address(); |
b8e6aad9 ILT |
1798 | Relocate_functions<32, false>::pcrel32(view, value, address); |
1799 | } | |
ead1e424 ILT |
1800 | break; |
1801 | ||
92e059d8 ILT |
1802 | case elfcpp::R_386_COPY: |
1803 | case elfcpp::R_386_GLOB_DAT: | |
1804 | case elfcpp::R_386_JUMP_SLOT: | |
1805 | case elfcpp::R_386_RELATIVE: | |
d61c17ea ILT |
1806 | // These are outstanding tls relocs, which are unexpected when |
1807 | // linking. | |
92e059d8 ILT |
1808 | case elfcpp::R_386_TLS_TPOFF: |
1809 | case elfcpp::R_386_TLS_DTPMOD32: | |
1810 | case elfcpp::R_386_TLS_DTPOFF32: | |
1811 | case elfcpp::R_386_TLS_TPOFF32: | |
1812 | case elfcpp::R_386_TLS_DESC: | |
75f2446e ILT |
1813 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1814 | _("unexpected reloc %u in object file"), | |
1815 | r_type); | |
92e059d8 ILT |
1816 | break; |
1817 | ||
d61c17ea ILT |
1818 | // These are initial tls relocs, which are expected when |
1819 | // linking. | |
56622147 ILT |
1820 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
1821 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
1822 | case elfcpp::R_386_TLS_DESC_CALL: | |
1823 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
1824 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
1825 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
92e059d8 | 1826 | case elfcpp::R_386_TLS_IE_32: |
56622147 ILT |
1827 | case elfcpp::R_386_TLS_GOTIE: |
1828 | case elfcpp::R_386_TLS_LE: // Local-exec | |
92e059d8 | 1829 | case elfcpp::R_386_TLS_LE_32: |
07f397ab ILT |
1830 | this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval, |
1831 | view, address, view_size); | |
92e059d8 ILT |
1832 | break; |
1833 | ||
92e059d8 ILT |
1834 | case elfcpp::R_386_32PLT: |
1835 | case elfcpp::R_386_TLS_GD_32: | |
1836 | case elfcpp::R_386_TLS_GD_PUSH: | |
1837 | case elfcpp::R_386_TLS_GD_CALL: | |
1838 | case elfcpp::R_386_TLS_GD_POP: | |
1839 | case elfcpp::R_386_TLS_LDM_32: | |
1840 | case elfcpp::R_386_TLS_LDM_PUSH: | |
1841 | case elfcpp::R_386_TLS_LDM_CALL: | |
1842 | case elfcpp::R_386_TLS_LDM_POP: | |
1843 | case elfcpp::R_386_USED_BY_INTEL_200: | |
61ba1cf9 | 1844 | default: |
75f2446e ILT |
1845 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1846 | _("unsupported reloc %u"), | |
1847 | r_type); | |
92e059d8 ILT |
1848 | break; |
1849 | } | |
ead1e424 ILT |
1850 | |
1851 | return true; | |
92e059d8 ILT |
1852 | } |
1853 | ||
1854 | // Perform a TLS relocation. | |
1855 | ||
1856 | inline void | |
1857 | Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo, | |
07f397ab | 1858 | Target_i386* target, |
92e059d8 ILT |
1859 | size_t relnum, |
1860 | const elfcpp::Rel<32, false>& rel, | |
1861 | unsigned int r_type, | |
c06b7b0b | 1862 | const Sized_symbol<32>* gsym, |
b8e6aad9 | 1863 | const Symbol_value<32>* psymval, |
92e059d8 ILT |
1864 | unsigned char* view, |
1865 | elfcpp::Elf_types<32>::Elf_Addr, | |
fe8718a4 | 1866 | section_size_type view_size) |
92e059d8 ILT |
1867 | { |
1868 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
92e059d8 | 1869 | |
07f397ab ILT |
1870 | const Sized_relobj<32, false>* object = relinfo->object; |
1871 | ||
1872 | elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0); | |
b8e6aad9 | 1873 | |
8851ecca ILT |
1874 | const bool is_final = |
1875 | (gsym == NULL | |
1876 | ? !parameters->options().output_is_position_independent() | |
1877 | : gsym->final_value_is_known()); | |
af6359d5 ILT |
1878 | const tls::Tls_optimization optimized_type |
1879 | = Target_i386::optimize_tls_reloc(is_final, r_type); | |
92e059d8 ILT |
1880 | switch (r_type) |
1881 | { | |
56622147 | 1882 | case elfcpp::R_386_TLS_GD: // Global-dynamic |
af6359d5 | 1883 | if (optimized_type == tls::TLSOPT_TO_LE) |
92e059d8 | 1884 | { |
07f397ab | 1885 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1886 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
1887 | rel, r_type, value, view, | |
1888 | view_size); | |
92e059d8 ILT |
1889 | break; |
1890 | } | |
07f397ab ILT |
1891 | else |
1892 | { | |
c2b45e22 CC |
1893 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1894 | ? GOT_TYPE_TLS_NOFFSET | |
1895 | : GOT_TYPE_TLS_PAIR); | |
07f397ab ILT |
1896 | unsigned int got_offset; |
1897 | if (gsym != NULL) | |
1898 | { | |
c2b45e22 CC |
1899 | gold_assert(gsym->has_got_offset(got_type)); |
1900 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
07f397ab ILT |
1901 | } |
1902 | else | |
1903 | { | |
1904 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
1905 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1906 | got_offset = (object->local_got_offset(r_sym, got_type) | |
07f397ab ILT |
1907 | - target->got_size()); |
1908 | } | |
1909 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1910 | { | |
1911 | gold_assert(tls_segment != NULL); | |
7bf1f802 ILT |
1912 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, |
1913 | got_offset, view, view_size); | |
07f397ab ILT |
1914 | break; |
1915 | } | |
1916 | else if (optimized_type == tls::TLSOPT_NONE) | |
1917 | { | |
1918 | // Relocate the field with the offset of the pair of GOT | |
1919 | // entries. | |
1920 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1921 | break; | |
1922 | } | |
1923 | } | |
75f2446e ILT |
1924 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1925 | _("unsupported reloc %u"), | |
1926 | r_type); | |
92e059d8 ILT |
1927 | break; |
1928 | ||
56622147 ILT |
1929 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) |
1930 | case elfcpp::R_386_TLS_DESC_CALL: | |
497897f9 | 1931 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; |
c2b45e22 CC |
1932 | if (optimized_type == tls::TLSOPT_TO_LE) |
1933 | { | |
1934 | gold_assert(tls_segment != NULL); | |
1935 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1936 | rel, r_type, value, view, | |
1937 | view_size); | |
1938 | break; | |
1939 | } | |
1940 | else | |
1941 | { | |
1942 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1943 | ? GOT_TYPE_TLS_NOFFSET | |
1944 | : GOT_TYPE_TLS_DESC); | |
1945 | unsigned int got_offset; | |
1946 | if (gsym != NULL) | |
1947 | { | |
1948 | gold_assert(gsym->has_got_offset(got_type)); | |
1949 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1950 | } | |
1951 | else | |
1952 | { | |
1953 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
1954 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1955 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1956 | - target->got_size()); | |
1957 | } | |
1958 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1959 | { | |
1960 | gold_assert(tls_segment != NULL); | |
1961 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type, | |
1962 | got_offset, view, view_size); | |
1963 | break; | |
1964 | } | |
1965 | else if (optimized_type == tls::TLSOPT_NONE) | |
1966 | { | |
1967 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
1968 | { | |
1969 | // Relocate the field with the offset of the pair of GOT | |
1970 | // entries. | |
1971 | Relocate_functions<32, false>::rel32(view, got_offset); | |
1972 | } | |
1973 | break; | |
1974 | } | |
1975 | } | |
75f2446e ILT |
1976 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1977 | _("unsupported reloc %u"), | |
1978 | r_type); | |
ead1e424 ILT |
1979 | break; |
1980 | ||
56622147 | 1981 | case elfcpp::R_386_TLS_LDM: // Local-dynamic |
46cf9fa2 ILT |
1982 | if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN) |
1983 | { | |
75f2446e ILT |
1984 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
1985 | _("both SUN and GNU model " | |
1986 | "TLS relocations")); | |
1987 | break; | |
46cf9fa2 ILT |
1988 | } |
1989 | this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU; | |
af6359d5 | 1990 | if (optimized_type == tls::TLSOPT_TO_LE) |
46cf9fa2 | 1991 | { |
07f397ab | 1992 | gold_assert(tls_segment != NULL); |
46cf9fa2 ILT |
1993 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type, |
1994 | value, view, view_size); | |
1995 | break; | |
1996 | } | |
07f397ab ILT |
1997 | else if (optimized_type == tls::TLSOPT_NONE) |
1998 | { | |
1999 | // Relocate the field with the offset of the GOT entry for | |
2000 | // the module index. | |
2001 | unsigned int got_offset; | |
94c4710f ILT |
2002 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2003 | - target->got_size()); | |
07f397ab ILT |
2004 | Relocate_functions<32, false>::rel32(view, got_offset); |
2005 | break; | |
2006 | } | |
75f2446e ILT |
2007 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2008 | _("unsupported reloc %u"), | |
2009 | r_type); | |
46cf9fa2 ILT |
2010 | break; |
2011 | ||
56622147 | 2012 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic |
d6f22b98 | 2013 | if (optimized_type == tls::TLSOPT_TO_LE) |
e8a9fcda | 2014 | { |
82bb573a ILT |
2015 | // This reloc can appear in debugging sections, in which |
2016 | // case we must not convert to local-exec. We decide what | |
2017 | // to do based on whether the section is marked as | |
2018 | // containing executable code. That is what the GNU linker | |
2019 | // does as well. | |
2020 | elfcpp::Shdr<32, false> shdr(relinfo->data_shdr); | |
2021 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) | |
d6f22b98 ILT |
2022 | { |
2023 | gold_assert(tls_segment != NULL); | |
2024 | value -= tls_segment->memsz(); | |
2025 | } | |
e8a9fcda | 2026 | } |
46cf9fa2 ILT |
2027 | Relocate_functions<32, false>::rel32(view, value); |
2028 | break; | |
2029 | ||
56622147 ILT |
2030 | case elfcpp::R_386_TLS_IE: // Initial-exec |
2031 | case elfcpp::R_386_TLS_GOTIE: | |
2032 | case elfcpp::R_386_TLS_IE_32: | |
2033 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2034 | { | |
07f397ab | 2035 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2036 | Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2037 | rel, r_type, value, view, | |
2038 | view_size); | |
2039 | break; | |
2040 | } | |
07f397ab ILT |
2041 | else if (optimized_type == tls::TLSOPT_NONE) |
2042 | { | |
2043 | // Relocate the field with the offset of the GOT entry for | |
2044 | // the tp-relative offset of the symbol. | |
c2b45e22 CC |
2045 | unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32 |
2046 | ? GOT_TYPE_TLS_OFFSET | |
2047 | : GOT_TYPE_TLS_NOFFSET); | |
07f397ab ILT |
2048 | unsigned int got_offset; |
2049 | if (gsym != NULL) | |
2050 | { | |
c2b45e22 CC |
2051 | gold_assert(gsym->has_got_offset(got_type)); |
2052 | got_offset = gsym->got_offset(got_type); | |
07f397ab ILT |
2053 | } |
2054 | else | |
2055 | { | |
2056 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
c2b45e22 CC |
2057 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2058 | got_offset = object->local_got_offset(r_sym, got_type); | |
07f397ab ILT |
2059 | } |
2060 | // For the R_386_TLS_IE relocation, we need to apply the | |
2061 | // absolute address of the GOT entry. | |
2062 | if (r_type == elfcpp::R_386_TLS_IE) | |
2063 | got_offset += target->got_plt_section()->address(); | |
2064 | // All GOT offsets are relative to the end of the GOT. | |
2065 | got_offset -= target->got_size(); | |
2066 | Relocate_functions<32, false>::rel32(view, got_offset); | |
2067 | break; | |
2068 | } | |
75f2446e ILT |
2069 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), |
2070 | _("unsupported reloc %u"), | |
2071 | r_type); | |
92e059d8 | 2072 | break; |
92e059d8 | 2073 | |
56622147 | 2074 | case elfcpp::R_386_TLS_LE: // Local-exec |
7bf1f802 ILT |
2075 | // If we're creating a shared library, a dynamic relocation will |
2076 | // have been created for this location, so do not apply it now. | |
8851ecca | 2077 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2078 | { |
2079 | gold_assert(tls_segment != NULL); | |
2080 | value -= tls_segment->memsz(); | |
2081 | Relocate_functions<32, false>::rel32(view, value); | |
2082 | } | |
56622147 | 2083 | break; |
92e059d8 | 2084 | |
56622147 | 2085 | case elfcpp::R_386_TLS_LE_32: |
7bf1f802 ILT |
2086 | // If we're creating a shared library, a dynamic relocation will |
2087 | // have been created for this location, so do not apply it now. | |
8851ecca | 2088 | if (!parameters->options().shared()) |
7bf1f802 ILT |
2089 | { |
2090 | gold_assert(tls_segment != NULL); | |
2091 | value = tls_segment->memsz() - value; | |
2092 | Relocate_functions<32, false>::rel32(view, value); | |
2093 | } | |
56622147 | 2094 | break; |
92e059d8 | 2095 | } |
92e059d8 ILT |
2096 | } |
2097 | ||
e041f13d | 2098 | // Do a relocation in which we convert a TLS General-Dynamic to a |
ead1e424 ILT |
2099 | // Local-Exec. |
2100 | ||
2101 | inline void | |
2102 | Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo, | |
2103 | size_t relnum, | |
2104 | Output_segment* tls_segment, | |
2105 | const elfcpp::Rel<32, false>& rel, | |
2106 | unsigned int, | |
2107 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2108 | unsigned char* view, | |
fe8718a4 | 2109 | section_size_type view_size) |
ead1e424 ILT |
2110 | { |
2111 | // leal foo(,%reg,1),%eax; call ___tls_get_addr | |
46cf9fa2 | 2112 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax |
ead1e424 ILT |
2113 | // leal foo(%reg),%eax; call ___tls_get_addr |
2114 | // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax | |
2115 | ||
af6359d5 ILT |
2116 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2117 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
ead1e424 ILT |
2118 | |
2119 | unsigned char op1 = view[-1]; | |
2120 | unsigned char op2 = view[-2]; | |
2121 | ||
af6359d5 ILT |
2122 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2123 | op2 == 0x8d || op2 == 0x04); | |
2124 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
ead1e424 ILT |
2125 | |
2126 | int roff = 5; | |
2127 | ||
2128 | if (op2 == 0x04) | |
2129 | { | |
af6359d5 ILT |
2130 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); |
2131 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2132 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2133 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
ead1e424 ILT |
2134 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
2135 | } | |
2136 | else | |
2137 | { | |
af6359d5 ILT |
2138 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2139 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2140 | if (rel.get_r_offset() + 9 < view_size |
d61c17ea | 2141 | && view[9] == 0x90) |
ead1e424 ILT |
2142 | { |
2143 | // There is a trailing nop. Use the size byte subl. | |
2144 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2145 | roff = 6; | |
2146 | } | |
2147 | else | |
2148 | { | |
2149 | // Use the five byte subl. | |
2150 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2151 | } | |
2152 | } | |
2153 | ||
7bf1f802 | 2154 | value = tls_segment->memsz() - value; |
ead1e424 ILT |
2155 | Relocate_functions<32, false>::rel32(view + roff, value); |
2156 | ||
2157 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2158 | // We can skip it. | |
2159 | this->skip_call_tls_get_addr_ = true; | |
2160 | } | |
2161 | ||
7bf1f802 | 2162 | // Do a relocation in which we convert a TLS General-Dynamic to an |
07f397ab ILT |
2163 | // Initial-Exec. |
2164 | ||
2165 | inline void | |
2166 | Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo, | |
2167 | size_t relnum, | |
c2b45e22 | 2168 | Output_segment*, |
07f397ab ILT |
2169 | const elfcpp::Rel<32, false>& rel, |
2170 | unsigned int, | |
2171 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2172 | unsigned char* view, | |
fe8718a4 | 2173 | section_size_type view_size) |
07f397ab ILT |
2174 | { |
2175 | // leal foo(,%ebx,1),%eax; call ___tls_get_addr | |
2176 | // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax | |
2177 | ||
2178 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2179 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
2180 | ||
2181 | unsigned char op1 = view[-1]; | |
2182 | unsigned char op2 = view[-2]; | |
2183 | ||
2184 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2185 | op2 == 0x8d || op2 == 0x04); | |
2186 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); | |
2187 | ||
2188 | int roff = 5; | |
2189 | ||
c2b45e22 CC |
2190 | // FIXME: For now, support only the first (SIB) form. |
2191 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04); | |
07f397ab ILT |
2192 | |
2193 | if (op2 == 0x04) | |
2194 | { | |
2195 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3); | |
2196 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d); | |
2197 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2198 | ((op1 & 0xc7) == 0x05 && op1 != (4 << 3))); | |
2199 | memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12); | |
2200 | } | |
2201 | else | |
2202 | { | |
2203 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2204 | (op1 & 0xf8) == 0x80 && (op1 & 7) != 4); | |
fe8718a4 | 2205 | if (rel.get_r_offset() + 9 < view_size |
07f397ab ILT |
2206 | && view[9] == 0x90) |
2207 | { | |
2208 | // FIXME: This is not the right instruction sequence. | |
2209 | // There is a trailing nop. Use the size byte subl. | |
2210 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); | |
2211 | roff = 6; | |
2212 | } | |
2213 | else | |
2214 | { | |
2215 | // FIXME: This is not the right instruction sequence. | |
2216 | // Use the five byte subl. | |
2217 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); | |
2218 | } | |
2219 | } | |
2220 | ||
07f397ab ILT |
2221 | Relocate_functions<32, false>::rel32(view + roff, value); |
2222 | ||
2223 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2224 | // We can skip it. | |
2225 | this->skip_call_tls_get_addr_ = true; | |
2226 | } | |
2227 | ||
c2b45e22 CC |
2228 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL |
2229 | // General-Dynamic to a Local-Exec. | |
2230 | ||
2231 | inline void | |
2232 | Target_i386::Relocate::tls_desc_gd_to_le( | |
2233 | const Relocate_info<32, false>* relinfo, | |
2234 | size_t relnum, | |
2235 | Output_segment* tls_segment, | |
2236 | const elfcpp::Rel<32, false>& rel, | |
2237 | unsigned int r_type, | |
2238 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2239 | unsigned char* view, | |
2240 | section_size_type view_size) | |
2241 | { | |
2242 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2243 | { | |
2244 | // leal foo@TLSDESC(%ebx), %eax | |
2245 | // ==> leal foo@NTPOFF, %eax | |
2246 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2247 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2248 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2249 | view[-2] == 0x8d && view[-1] == 0x83); | |
2250 | view[-1] = 0x05; | |
2251 | value -= tls_segment->memsz(); | |
2252 | Relocate_functions<32, false>::rel32(view, value); | |
2253 | } | |
2254 | else | |
2255 | { | |
2256 | // call *foo@TLSCALL(%eax) | |
2257 | // ==> nop; nop | |
2258 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2259 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2260 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2261 | view[0] == 0xff && view[1] == 0x10); | |
2262 | view[0] = 0x66; | |
2263 | view[1] = 0x90; | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL | |
2268 | // General-Dynamic to an Initial-Exec. | |
2269 | ||
2270 | inline void | |
2271 | Target_i386::Relocate::tls_desc_gd_to_ie( | |
2272 | const Relocate_info<32, false>* relinfo, | |
2273 | size_t relnum, | |
2274 | Output_segment*, | |
2275 | const elfcpp::Rel<32, false>& rel, | |
2276 | unsigned int r_type, | |
2277 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2278 | unsigned char* view, | |
2279 | section_size_type view_size) | |
2280 | { | |
2281 | if (r_type == elfcpp::R_386_TLS_GOTDESC) | |
2282 | { | |
2283 | // leal foo@TLSDESC(%ebx), %eax | |
2284 | // ==> movl foo@GOTNTPOFF(%ebx), %eax | |
2285 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2286 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2287 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2288 | view[-2] == 0x8d && view[-1] == 0x83); | |
2289 | view[-2] = 0x8b; | |
2290 | Relocate_functions<32, false>::rel32(view, value); | |
2291 | } | |
2292 | else | |
2293 | { | |
2294 | // call *foo@TLSCALL(%eax) | |
2295 | // ==> nop; nop | |
2296 | gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL); | |
2297 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2); | |
2298 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2299 | view[0] == 0xff && view[1] == 0x10); | |
2300 | view[0] = 0x66; | |
2301 | view[1] = 0x90; | |
2302 | } | |
2303 | } | |
2304 | ||
46cf9fa2 ILT |
2305 | // Do a relocation in which we convert a TLS Local-Dynamic to a |
2306 | // Local-Exec. | |
2307 | ||
2308 | inline void | |
2309 | Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo, | |
2310 | size_t relnum, | |
2311 | Output_segment*, | |
2312 | const elfcpp::Rel<32, false>& rel, | |
2313 | unsigned int, | |
2314 | elfcpp::Elf_types<32>::Elf_Addr, | |
2315 | unsigned char* view, | |
fe8718a4 | 2316 | section_size_type view_size) |
46cf9fa2 ILT |
2317 | { |
2318 | // leal foo(%reg), %eax; call ___tls_get_addr | |
2319 | // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi | |
2320 | ||
af6359d5 ILT |
2321 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); |
2322 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9); | |
46cf9fa2 ILT |
2323 | |
2324 | // FIXME: Does this test really always pass? | |
af6359d5 ILT |
2325 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), |
2326 | view[-2] == 0x8d && view[-1] == 0x83); | |
46cf9fa2 | 2327 | |
af6359d5 | 2328 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8); |
46cf9fa2 ILT |
2329 | |
2330 | memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11); | |
2331 | ||
2332 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2333 | // We can skip it. | |
2334 | this->skip_call_tls_get_addr_ = true; | |
2335 | } | |
2336 | ||
56622147 ILT |
2337 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2338 | // Local-Exec. | |
2339 | ||
2340 | inline void | |
2341 | Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo, | |
2342 | size_t relnum, | |
2343 | Output_segment* tls_segment, | |
2344 | const elfcpp::Rel<32, false>& rel, | |
2345 | unsigned int r_type, | |
2346 | elfcpp::Elf_types<32>::Elf_Addr value, | |
2347 | unsigned char* view, | |
fe8718a4 | 2348 | section_size_type view_size) |
56622147 ILT |
2349 | { |
2350 | // We have to actually change the instructions, which means that we | |
2351 | // need to examine the opcodes to figure out which instruction we | |
2352 | // are looking at. | |
2353 | if (r_type == elfcpp::R_386_TLS_IE) | |
2354 | { | |
2355 | // movl %gs:XX,%eax ==> movl $YY,%eax | |
2356 | // movl %gs:XX,%reg ==> movl $YY,%reg | |
2357 | // addl %gs:XX,%reg ==> addl $YY,%reg | |
2358 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1); | |
2359 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2360 | ||
2361 | unsigned char op1 = view[-1]; | |
2362 | if (op1 == 0xa1) | |
2363 | { | |
2364 | // movl XX,%eax ==> movl $YY,%eax | |
2365 | view[-1] = 0xb8; | |
2366 | } | |
2367 | else | |
2368 | { | |
2369 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2370 | ||
2371 | unsigned char op2 = view[-2]; | |
2372 | if (op2 == 0x8b) | |
2373 | { | |
2374 | // movl XX,%reg ==> movl $YY,%reg | |
2375 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2376 | (op1 & 0xc7) == 0x05); | |
2377 | view[-2] = 0xc7; | |
2378 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2379 | } | |
2380 | else if (op2 == 0x03) | |
2381 | { | |
2382 | // addl XX,%reg ==> addl $YY,%reg | |
2383 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2384 | (op1 & 0xc7) == 0x05); | |
2385 | view[-2] = 0x81; | |
2386 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2387 | } | |
2388 | else | |
2389 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2390 | } | |
2391 | } | |
2392 | else | |
2393 | { | |
2394 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2395 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2396 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2397 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2); | |
2398 | tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4); | |
2399 | ||
2400 | unsigned char op1 = view[-1]; | |
2401 | unsigned char op2 = view[-2]; | |
2402 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), | |
2403 | (op1 & 0xc0) == 0x80 && (op1 & 7) != 4); | |
2404 | if (op2 == 0x8b) | |
2405 | { | |
2406 | // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2 | |
2407 | view[-2] = 0xc7; | |
2408 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2409 | } | |
2410 | else if (op2 == 0x2b) | |
2411 | { | |
2412 | // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2 | |
2413 | view[-2] = 0x81; | |
2414 | view[-1] = 0xe8 | ((op1 >> 3) & 7); | |
2415 | } | |
2416 | else if (op2 == 0x03) | |
2417 | { | |
2418 | // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2 | |
2419 | view[-2] = 0x81; | |
2420 | view[-1] = 0xc0 | ((op1 >> 3) & 7); | |
2421 | } | |
2422 | else | |
2423 | tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0); | |
2424 | } | |
2425 | ||
7bf1f802 | 2426 | value = tls_segment->memsz() - value; |
56622147 ILT |
2427 | if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE) |
2428 | value = - value; | |
2429 | ||
2430 | Relocate_functions<32, false>::rel32(view, value); | |
2431 | } | |
2432 | ||
61ba1cf9 ILT |
2433 | // Relocate section data. |
2434 | ||
2435 | void | |
92e059d8 | 2436 | Target_i386::relocate_section(const Relocate_info<32, false>* relinfo, |
61ba1cf9 ILT |
2437 | unsigned int sh_type, |
2438 | const unsigned char* prelocs, | |
2439 | size_t reloc_count, | |
730cdc88 ILT |
2440 | Output_section* output_section, |
2441 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
2442 | unsigned char* view, |
2443 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
2444 | section_size_type view_size, |
2445 | const Reloc_symbol_changes* reloc_symbol_changes) | |
61ba1cf9 | 2446 | { |
a3ad94ed | 2447 | gold_assert(sh_type == elfcpp::SHT_REL); |
61ba1cf9 | 2448 | |
ead1e424 ILT |
2449 | gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL, |
2450 | Target_i386::Relocate>( | |
92e059d8 | 2451 | relinfo, |
ead1e424 | 2452 | this, |
61ba1cf9 ILT |
2453 | prelocs, |
2454 | reloc_count, | |
730cdc88 ILT |
2455 | output_section, |
2456 | needs_special_offset_handling, | |
61ba1cf9 ILT |
2457 | view, |
2458 | address, | |
364c7fa5 ILT |
2459 | view_size, |
2460 | reloc_symbol_changes); | |
61ba1cf9 ILT |
2461 | } |
2462 | ||
6a74a719 ILT |
2463 | // Return the size of a relocation while scanning during a relocatable |
2464 | // link. | |
2465 | ||
2466 | unsigned int | |
2467 | Target_i386::Relocatable_size_for_reloc::get_size_for_reloc( | |
2468 | unsigned int r_type, | |
2469 | Relobj* object) | |
2470 | { | |
2471 | switch (r_type) | |
2472 | { | |
2473 | case elfcpp::R_386_NONE: | |
2474 | case elfcpp::R_386_GNU_VTINHERIT: | |
2475 | case elfcpp::R_386_GNU_VTENTRY: | |
2476 | case elfcpp::R_386_TLS_GD: // Global-dynamic | |
2477 | case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url) | |
2478 | case elfcpp::R_386_TLS_DESC_CALL: | |
2479 | case elfcpp::R_386_TLS_LDM: // Local-dynamic | |
2480 | case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic | |
2481 | case elfcpp::R_386_TLS_IE: // Initial-exec | |
2482 | case elfcpp::R_386_TLS_IE_32: | |
2483 | case elfcpp::R_386_TLS_GOTIE: | |
2484 | case elfcpp::R_386_TLS_LE: // Local-exec | |
2485 | case elfcpp::R_386_TLS_LE_32: | |
2486 | return 0; | |
2487 | ||
2488 | case elfcpp::R_386_32: | |
2489 | case elfcpp::R_386_PC32: | |
2490 | case elfcpp::R_386_GOT32: | |
2491 | case elfcpp::R_386_PLT32: | |
2492 | case elfcpp::R_386_GOTOFF: | |
2493 | case elfcpp::R_386_GOTPC: | |
2494 | return 4; | |
2495 | ||
2496 | case elfcpp::R_386_16: | |
2497 | case elfcpp::R_386_PC16: | |
2498 | return 2; | |
2499 | ||
2500 | case elfcpp::R_386_8: | |
2501 | case elfcpp::R_386_PC8: | |
2502 | return 1; | |
2503 | ||
2504 | // These are relocations which should only be seen by the | |
2505 | // dynamic linker, and should never be seen here. | |
2506 | case elfcpp::R_386_COPY: | |
2507 | case elfcpp::R_386_GLOB_DAT: | |
2508 | case elfcpp::R_386_JUMP_SLOT: | |
2509 | case elfcpp::R_386_RELATIVE: | |
2510 | case elfcpp::R_386_TLS_TPOFF: | |
2511 | case elfcpp::R_386_TLS_DTPMOD32: | |
2512 | case elfcpp::R_386_TLS_DTPOFF32: | |
2513 | case elfcpp::R_386_TLS_TPOFF32: | |
2514 | case elfcpp::R_386_TLS_DESC: | |
2515 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2516 | return 0; | |
2517 | ||
2518 | case elfcpp::R_386_32PLT: | |
2519 | case elfcpp::R_386_TLS_GD_32: | |
2520 | case elfcpp::R_386_TLS_GD_PUSH: | |
2521 | case elfcpp::R_386_TLS_GD_CALL: | |
2522 | case elfcpp::R_386_TLS_GD_POP: | |
2523 | case elfcpp::R_386_TLS_LDM_32: | |
2524 | case elfcpp::R_386_TLS_LDM_PUSH: | |
2525 | case elfcpp::R_386_TLS_LDM_CALL: | |
2526 | case elfcpp::R_386_TLS_LDM_POP: | |
2527 | case elfcpp::R_386_USED_BY_INTEL_200: | |
2528 | default: | |
2529 | object->error(_("unsupported reloc %u in object file"), r_type); | |
2530 | return 0; | |
2531 | } | |
2532 | } | |
2533 | ||
2534 | // Scan the relocs during a relocatable link. | |
2535 | ||
2536 | void | |
ad0f2072 | 2537 | Target_i386::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2538 | Layout* layout, |
2539 | Sized_relobj<32, false>* object, | |
2540 | unsigned int data_shndx, | |
2541 | unsigned int sh_type, | |
2542 | const unsigned char* prelocs, | |
2543 | size_t reloc_count, | |
2544 | Output_section* output_section, | |
2545 | bool needs_special_offset_handling, | |
2546 | size_t local_symbol_count, | |
2547 | const unsigned char* plocal_symbols, | |
2548 | Relocatable_relocs* rr) | |
2549 | { | |
2550 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2551 | ||
2552 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
2553 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2554 | ||
7019cd25 | 2555 | gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL, |
6a74a719 | 2556 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2557 | symtab, |
2558 | layout, | |
2559 | object, | |
2560 | data_shndx, | |
2561 | prelocs, | |
2562 | reloc_count, | |
2563 | output_section, | |
2564 | needs_special_offset_handling, | |
2565 | local_symbol_count, | |
2566 | plocal_symbols, | |
2567 | rr); | |
2568 | } | |
2569 | ||
2570 | // Relocate a section during a relocatable link. | |
2571 | ||
2572 | void | |
2573 | Target_i386::relocate_for_relocatable( | |
2574 | const Relocate_info<32, false>* relinfo, | |
2575 | unsigned int sh_type, | |
2576 | const unsigned char* prelocs, | |
2577 | size_t reloc_count, | |
2578 | Output_section* output_section, | |
2579 | off_t offset_in_output_section, | |
2580 | const Relocatable_relocs* rr, | |
2581 | unsigned char* view, | |
2582 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
2583 | section_size_type view_size, | |
2584 | unsigned char* reloc_view, | |
2585 | section_size_type reloc_view_size) | |
2586 | { | |
2587 | gold_assert(sh_type == elfcpp::SHT_REL); | |
2588 | ||
7019cd25 | 2589 | gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>( |
6a74a719 ILT |
2590 | relinfo, |
2591 | prelocs, | |
2592 | reloc_count, | |
2593 | output_section, | |
2594 | offset_in_output_section, | |
2595 | rr, | |
2596 | view, | |
2597 | view_address, | |
2598 | view_size, | |
2599 | reloc_view, | |
2600 | reloc_view_size); | |
2601 | } | |
2602 | ||
ab5c9e90 ILT |
2603 | // Return the value to use for a dynamic which requires special |
2604 | // treatment. This is how we support equality comparisons of function | |
2605 | // pointers across shared library boundaries, as described in the | |
2606 | // processor specific ABI supplement. | |
2607 | ||
2608 | uint64_t | |
2609 | Target_i386::do_dynsym_value(const Symbol* gsym) const | |
2610 | { | |
2611 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2612 | return this->plt_section()->address() + gsym->plt_offset(); | |
2613 | } | |
2614 | ||
c51e6221 ILT |
2615 | // Return a string used to fill a code section with nops to take up |
2616 | // the specified length. | |
2617 | ||
2618 | std::string | |
8851ecca | 2619 | Target_i386::do_code_fill(section_size_type length) const |
c51e6221 ILT |
2620 | { |
2621 | if (length >= 16) | |
2622 | { | |
2623 | // Build a jmp instruction to skip over the bytes. | |
2624 | unsigned char jmp[5]; | |
2625 | jmp[0] = 0xe9; | |
2626 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); | |
2627 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2628 | + std::string(length - 5, '\0')); | |
2629 | } | |
2630 | ||
2631 | // Nop sequences of various lengths. | |
2632 | const char nop1[1] = { 0x90 }; // nop | |
2633 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2634 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2635 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2636 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2637 | 0x00 }; // leal 0(%esi,1),%esi | |
2638 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2639 | 0x00, 0x00 }; | |
2640 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2641 | 0x00, 0x00, 0x00 }; | |
2642 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2643 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2644 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2645 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2646 | 0x00 }; | |
2647 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2648 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2649 | 0x00, 0x00 }; | |
2650 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2651 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2652 | 0x00, 0x00, 0x00 }; | |
2653 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2654 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2655 | 0x00, 0x00, 0x00, 0x00 }; | |
2656 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2657 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2658 | 0x27, 0x00, 0x00, 0x00, | |
2659 | 0x00 }; | |
2660 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2661 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2662 | 0xbc, 0x27, 0x00, 0x00, | |
2663 | 0x00, 0x00 }; | |
2664 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2665 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2666 | 0x90, 0x90, 0x90, 0x90, | |
2667 | 0x90, 0x90, 0x90 }; | |
2668 | ||
2669 | const char* nops[16] = { | |
2670 | NULL, | |
2671 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2672 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2673 | }; | |
2674 | ||
2675 | return std::string(nops[length], length); | |
2676 | } | |
2677 | ||
364c7fa5 ILT |
2678 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2679 | // compiled with -fstack-split. The function calls non-stack-split | |
2680 | // code. We have to change the function so that it always ensures | |
2681 | // that it has enough stack space to run some random function. | |
2682 | ||
2683 | void | |
2684 | Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2685 | section_offset_type fnoffset, | |
2686 | section_size_type fnsize, | |
2687 | unsigned char* view, | |
2688 | section_size_type view_size, | |
2689 | std::string* from, | |
2690 | std::string* to) const | |
2691 | { | |
2692 | // The function starts with a comparison of the stack pointer and a | |
2693 | // field in the TCB. This is followed by a jump. | |
2694 | ||
2695 | // cmp %gs:NN,%esp | |
2696 | if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3) | |
2697 | && fnsize > 7) | |
2698 | { | |
2699 | // We will call __morestack if the carry flag is set after this | |
2700 | // comparison. We turn the comparison into an stc instruction | |
2701 | // and some nops. | |
2702 | view[fnoffset] = '\xf9'; | |
2703 | this->set_view_to_nop(view, view_size, fnoffset + 1, 6); | |
2704 | } | |
2705 | // lea NN(%esp),%ecx | |
2706 | else if (this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3) | |
2707 | && fnsize > 7) | |
2708 | { | |
2709 | // This is loading an offset from the stack pointer for a | |
2710 | // comparison. The offset is negative, so we decrease the | |
2711 | // offset by the amount of space we need for the stack. This | |
2712 | // means we will avoid calling __morestack if there happens to | |
2713 | // be plenty of space on the stack already. | |
2714 | unsigned char* pval = view + fnoffset + 3; | |
2715 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2716 | val -= parameters->options().split_stack_adjust_size(); | |
2717 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2718 | } | |
2719 | else | |
2720 | { | |
2721 | if (!object->has_no_split_stack()) | |
2722 | object->error(_("failed to match split-stack sequence at " | |
2723 | "section %u offset %0zx"), | |
ac33a407 | 2724 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2725 | return; |
2726 | } | |
2727 | ||
2728 | // We have to change the function so that it calls | |
2729 | // __morestack_non_split instead of __morestack. The former will | |
2730 | // allocate additional stack space. | |
2731 | *from = "__morestack"; | |
2732 | *to = "__morestack_non_split"; | |
2733 | } | |
2734 | ||
14bfc3f5 ILT |
2735 | // The selector for i386 object files. |
2736 | ||
36959681 | 2737 | class Target_selector_i386 : public Target_selector_freebsd |
14bfc3f5 ILT |
2738 | { |
2739 | public: | |
2740 | Target_selector_i386() | |
36959681 ILT |
2741 | : Target_selector_freebsd(elfcpp::EM_386, 32, false, |
2742 | "elf32-i386", "elf32-i386-freebsd") | |
14bfc3f5 ILT |
2743 | { } |
2744 | ||
2745 | Target* | |
e96caa79 ILT |
2746 | do_instantiate_target() |
2747 | { return new Target_i386(); } | |
14bfc3f5 ILT |
2748 | }; |
2749 | ||
14bfc3f5 ILT |
2750 | Target_selector_i386 target_selector_i386; |
2751 | ||
2752 | } // End anonymous namespace. |