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a2fb1b05 ILT |
1 | // layout.h -- lay out output file sections for gold -*- C++ -*- |
2 | ||
e5756efb | 3 | // Copyright 2006, 2007, 2008 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 | ||
a2fb1b05 ILT |
23 | #ifndef GOLD_LAYOUT_H |
24 | #define GOLD_LAYOUT_H | |
25 | ||
e94cf127 | 26 | #include <cstring> |
a2fb1b05 ILT |
27 | #include <list> |
28 | #include <string> | |
29 | #include <utility> | |
30 | #include <vector> | |
31 | ||
e5756efb | 32 | #include "script.h" |
a2fb1b05 ILT |
33 | #include "workqueue.h" |
34 | #include "object.h" | |
14b31740 | 35 | #include "dynobj.h" |
a2fb1b05 ILT |
36 | #include "stringpool.h" |
37 | ||
38 | namespace gold | |
39 | { | |
40 | ||
ead1e424 | 41 | class General_options; |
54dc6425 | 42 | class Input_objects; |
7d9e3d98 | 43 | class Mapfile; |
75f65a3e | 44 | class Symbol_table; |
ead1e424 | 45 | class Output_section_data; |
a2fb1b05 | 46 | class Output_section; |
75f65a3e | 47 | class Output_section_headers; |
a2fb1b05 | 48 | class Output_segment; |
54dc6425 | 49 | class Output_data; |
a3ad94ed | 50 | class Output_data_dynamic; |
d491d34e | 51 | class Output_symtab_xindex; |
730cdc88 | 52 | class Eh_frame; |
61ba1cf9 | 53 | class Target; |
a2fb1b05 | 54 | |
92e059d8 ILT |
55 | // This task function handles mapping the input sections to output |
56 | // sections and laying them out in memory. | |
a2fb1b05 | 57 | |
92e059d8 | 58 | class Layout_task_runner : public Task_function_runner |
a2fb1b05 ILT |
59 | { |
60 | public: | |
61 | // OPTIONS is the command line options, INPUT_OBJECTS is the list of | |
92e059d8 ILT |
62 | // input objects, SYMTAB is the symbol table, LAYOUT is the layout |
63 | // object. | |
64 | Layout_task_runner(const General_options& options, | |
65 | const Input_objects* input_objects, | |
66 | Symbol_table* symtab, | |
8851ecca | 67 | Target* target, |
7d9e3d98 ILT |
68 | Layout* layout, |
69 | Mapfile* mapfile) | |
75f65a3e | 70 | : options_(options), input_objects_(input_objects), symtab_(symtab), |
7d9e3d98 | 71 | target_(target), layout_(layout), mapfile_(mapfile) |
a2fb1b05 ILT |
72 | { } |
73 | ||
92e059d8 | 74 | // Run the operation. |
a2fb1b05 | 75 | void |
17a1d0a9 | 76 | run(Workqueue*, const Task*); |
a2fb1b05 ILT |
77 | |
78 | private: | |
92e059d8 ILT |
79 | Layout_task_runner(const Layout_task_runner&); |
80 | Layout_task_runner& operator=(const Layout_task_runner&); | |
a2fb1b05 ILT |
81 | |
82 | const General_options& options_; | |
54dc6425 | 83 | const Input_objects* input_objects_; |
75f65a3e | 84 | Symbol_table* symtab_; |
8851ecca | 85 | Target* target_; |
12e14209 | 86 | Layout* layout_; |
7d9e3d98 | 87 | Mapfile* mapfile_; |
a2fb1b05 ILT |
88 | }; |
89 | ||
90 | // This class handles the details of laying out input sections. | |
91 | ||
92 | class Layout | |
93 | { | |
94 | public: | |
e5756efb | 95 | Layout(const General_options& options, Script_options*); |
54dc6425 | 96 | |
ead1e424 ILT |
97 | // Given an input section SHNDX, named NAME, with data in SHDR, from |
98 | // the object file OBJECT, return the output section where this | |
730cdc88 ILT |
99 | // input section should go. RELOC_SHNDX is the index of a |
100 | // relocation section which applies to this section, or 0 if none, | |
101 | // or -1U if more than one. RELOC_TYPE is the type of the | |
102 | // relocation section if there is one. Set *OFFSET to the offset | |
103 | // within the output section. | |
a2fb1b05 ILT |
104 | template<int size, bool big_endian> |
105 | Output_section* | |
730cdc88 ILT |
106 | layout(Sized_relobj<size, big_endian> *object, unsigned int shndx, |
107 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
108 | unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset); | |
109 | ||
6a74a719 ILT |
110 | // Layout an input reloc section when doing a relocatable link. The |
111 | // section is RELOC_SHNDX in OBJECT, with data in SHDR. | |
112 | // DATA_SECTION is the reloc section to which it refers. RR is the | |
113 | // relocatable information. | |
114 | template<int size, bool big_endian> | |
115 | Output_section* | |
116 | layout_reloc(Sized_relobj<size, big_endian>* object, | |
117 | unsigned int reloc_shndx, | |
118 | const elfcpp::Shdr<size, big_endian>& shdr, | |
119 | Output_section* data_section, | |
120 | Relocatable_relocs* rr); | |
121 | ||
122 | // Layout a group section when doing a relocatable link. | |
123 | template<int size, bool big_endian> | |
124 | void | |
125 | layout_group(Symbol_table* symtab, | |
126 | Sized_relobj<size, big_endian>* object, | |
127 | unsigned int group_shndx, | |
128 | const char* group_section_name, | |
129 | const char* signature, | |
130 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
131 | elfcpp::Elf_Word flags, |
132 | std::vector<unsigned int>* shndxes); | |
6a74a719 | 133 | |
730cdc88 ILT |
134 | // Like layout, only for exception frame sections. OBJECT is an |
135 | // object file. SYMBOLS is the contents of the symbol table | |
136 | // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of | |
137 | // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a | |
138 | // .eh_frame section in OBJECT. SHDR is the section header. | |
139 | // RELOC_SHNDX is the index of a relocation section which applies to | |
140 | // this section, or 0 if none, or -1U if more than one. RELOC_TYPE | |
141 | // is the type of the relocation section if there is one. This | |
142 | // returns the output section, and sets *OFFSET to the offset. | |
143 | template<int size, bool big_endian> | |
144 | Output_section* | |
145 | layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
146 | const unsigned char* symbols, | |
147 | off_t symbols_size, | |
148 | const unsigned char* symbol_names, | |
149 | off_t symbol_names_size, | |
150 | unsigned int shndx, | |
151 | const elfcpp::Shdr<size, big_endian>& shdr, | |
152 | unsigned int reloc_shndx, unsigned int reloc_type, | |
153 | off_t* offset); | |
a2fb1b05 | 154 | |
35cdfc9a ILT |
155 | // Handle a GNU stack note. This is called once per input object |
156 | // file. SEEN_GNU_STACK is true if the object file has a | |
157 | // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags | |
158 | // from that section if there was one. | |
159 | void | |
160 | layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags); | |
161 | ||
ead1e424 ILT |
162 | // Add an Output_section_data to the layout. This is used for |
163 | // special sections like the GOT section. | |
9f1d377b | 164 | Output_section* |
ead1e424 ILT |
165 | add_output_section_data(const char* name, elfcpp::Elf_Word type, |
166 | elfcpp::Elf_Xword flags, | |
167 | Output_section_data*); | |
168 | ||
a3ad94ed ILT |
169 | // Create dynamic sections if necessary. |
170 | void | |
9b07f471 | 171 | create_initial_dynamic_sections(Symbol_table*); |
a3ad94ed | 172 | |
bfd58944 ILT |
173 | // Define __start and __stop symbols for output sections. |
174 | void | |
9b07f471 | 175 | define_section_symbols(Symbol_table*); |
bfd58944 | 176 | |
919ed24c ILT |
177 | // Create sections for linker scripts. |
178 | void | |
179 | create_script_sections() | |
180 | { this->script_options_->create_script_sections(this); } | |
181 | ||
e5756efb ILT |
182 | // Define symbols from any linker script. |
183 | void | |
9b07f471 ILT |
184 | define_script_symbols(Symbol_table* symtab) |
185 | { this->script_options_->add_symbols_to_table(symtab); } | |
e5756efb | 186 | |
755ab8af ILT |
187 | // Define symbols for group signatures. |
188 | void | |
189 | define_group_signatures(Symbol_table*); | |
190 | ||
61ba1cf9 ILT |
191 | // Return the Stringpool used for symbol names. |
192 | const Stringpool* | |
193 | sympool() const | |
194 | { return &this->sympool_; } | |
195 | ||
16649710 ILT |
196 | // Return the Stringpool used for dynamic symbol names and dynamic |
197 | // tags. | |
198 | const Stringpool* | |
199 | dynpool() const | |
200 | { return &this->dynpool_; } | |
201 | ||
d491d34e ILT |
202 | // Return the symtab_xindex section used to hold large section |
203 | // indexes for the normal symbol table. | |
204 | Output_symtab_xindex* | |
205 | symtab_xindex() const | |
206 | { return this->symtab_xindex_; } | |
207 | ||
208 | // Return the dynsym_xindex section used to hold large section | |
209 | // indexes for the dynamic symbol table. | |
210 | Output_symtab_xindex* | |
211 | dynsym_xindex() const | |
212 | { return this->dynsym_xindex_; } | |
213 | ||
a2fb1b05 ILT |
214 | // Return whether a section is a .gnu.linkonce section, given the |
215 | // section name. | |
216 | static inline bool | |
217 | is_linkonce(const char* name) | |
218 | { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; } | |
219 | ||
e94cf127 CC |
220 | // Return true if a section is a debugging section. |
221 | static inline bool | |
222 | is_debug_info_section(const char* name) | |
223 | { | |
224 | // Debugging sections can only be recognized by name. | |
225 | return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0 | |
226 | || strncmp(name, ".gnu.linkonce.wi.", | |
227 | sizeof(".gnu.linkonce.wi.") - 1) == 0 | |
228 | || strncmp(name, ".line", sizeof(".line") - 1) == 0 | |
229 | || strncmp(name, ".stab", sizeof(".stab") - 1) == 0); | |
230 | } | |
231 | ||
a2fb1b05 ILT |
232 | // Record the signature of a comdat section, and return whether to |
233 | // include it in the link. The GROUP parameter is true for a | |
234 | // section group signature, false for a signature derived from a | |
235 | // .gnu.linkonce section. | |
236 | bool | |
e94cf127 CC |
237 | add_comdat(Relobj*, unsigned int, const std::string&, bool group); |
238 | ||
239 | // Find the given comdat signature, and return the object and section | |
240 | // index of the kept group. | |
241 | Relobj* | |
242 | find_kept_object(const std::string&, unsigned int*) const; | |
a2fb1b05 | 243 | |
54dc6425 | 244 | // Finalize the layout after all the input sections have been added. |
75f65a3e | 245 | off_t |
8851ecca | 246 | finalize(const Input_objects*, Symbol_table*, Target*, const Task*); |
17a1d0a9 ILT |
247 | |
248 | // Return whether any sections require postprocessing. | |
249 | bool | |
250 | any_postprocessing_sections() const | |
251 | { return this->any_postprocessing_sections_; } | |
54dc6425 | 252 | |
e44fcf3b ILT |
253 | // Return the size of the output file. |
254 | off_t | |
255 | output_file_size() const | |
256 | { return this->output_file_size_; } | |
257 | ||
16649710 ILT |
258 | // Return the TLS segment. This will return NULL if there isn't |
259 | // one. | |
92e059d8 ILT |
260 | Output_segment* |
261 | tls_segment() const | |
262 | { return this->tls_segment_; } | |
263 | ||
16649710 ILT |
264 | // Return the normal symbol table. |
265 | Output_section* | |
266 | symtab_section() const | |
267 | { | |
268 | gold_assert(this->symtab_section_ != NULL); | |
269 | return this->symtab_section_; | |
270 | } | |
271 | ||
272 | // Return the dynamic symbol table. | |
273 | Output_section* | |
274 | dynsym_section() const | |
275 | { | |
276 | gold_assert(this->dynsym_section_ != NULL); | |
277 | return this->dynsym_section_; | |
278 | } | |
279 | ||
280 | // Return the dynamic tags. | |
281 | Output_data_dynamic* | |
282 | dynamic_data() const | |
283 | { return this->dynamic_data_; } | |
284 | ||
730cdc88 ILT |
285 | // Write out the output sections. |
286 | void | |
287 | write_output_sections(Output_file* of) const; | |
288 | ||
61ba1cf9 ILT |
289 | // Write out data not associated with an input file or the symbol |
290 | // table. | |
291 | void | |
9025d29d | 292 | write_data(const Symbol_table*, Output_file*) const; |
61ba1cf9 | 293 | |
730cdc88 ILT |
294 | // Write out output sections which can not be written until all the |
295 | // input sections are complete. | |
296 | void | |
27bc2bce | 297 | write_sections_after_input_sections(Output_file* of); |
730cdc88 | 298 | |
ead1e424 ILT |
299 | // Return an output section named NAME, or NULL if there is none. |
300 | Output_section* | |
301 | find_output_section(const char* name) const; | |
302 | ||
303 | // Return an output segment of type TYPE, with segment flags SET set | |
304 | // and segment flags CLEAR clear. Return NULL if there is none. | |
305 | Output_segment* | |
306 | find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
307 | elfcpp::Elf_Word clear) const; | |
308 | ||
3802b2dd ILT |
309 | // Return the number of segments we expect to produce. |
310 | size_t | |
311 | expected_segment_count() const; | |
312 | ||
535890bb ILT |
313 | // Set a flag to indicate that an object file uses the static TLS model. |
314 | void | |
315 | set_has_static_tls() | |
316 | { this->has_static_tls_ = true; } | |
317 | ||
318 | // Return true if any object file uses the static TLS model. | |
319 | bool | |
320 | has_static_tls() const | |
321 | { return this->has_static_tls_; } | |
322 | ||
e5756efb ILT |
323 | // Return the options which may be set by a linker script. |
324 | Script_options* | |
325 | script_options() | |
326 | { return this->script_options_; } | |
327 | ||
328 | const Script_options* | |
329 | script_options() const | |
330 | { return this->script_options_; } | |
d391083d | 331 | |
8ed814a9 ILT |
332 | // Compute and write out the build ID if needed. |
333 | void | |
334 | write_build_id(Output_file*) const; | |
335 | ||
516cb3d0 ILT |
336 | // Rewrite output file in binary format. |
337 | void | |
338 | write_binary(Output_file* in) const; | |
339 | ||
7d9e3d98 ILT |
340 | // Print output sections to the map file. |
341 | void | |
342 | print_to_mapfile(Mapfile*) const; | |
343 | ||
ad8f37d1 ILT |
344 | // Dump statistical information to stderr. |
345 | void | |
346 | print_stats() const; | |
347 | ||
a445fddf | 348 | // A list of segments. |
54dc6425 ILT |
349 | |
350 | typedef std::vector<Output_segment*> Segment_list; | |
351 | ||
a445fddf | 352 | // A list of sections. |
54dc6425 | 353 | |
a3ad94ed | 354 | typedef std::vector<Output_section*> Section_list; |
54dc6425 ILT |
355 | |
356 | // The list of information to write out which is not attached to | |
357 | // either a section or a segment. | |
a3ad94ed | 358 | typedef std::vector<Output_data*> Data_list; |
54dc6425 | 359 | |
a445fddf ILT |
360 | // Store the allocated sections into the section list. This is used |
361 | // by the linker script code. | |
362 | void | |
363 | get_allocated_sections(Section_list*) const; | |
364 | ||
919ed24c ILT |
365 | // Make a section for a linker script to hold data. |
366 | Output_section* | |
367 | make_output_section_for_script(const char* name); | |
368 | ||
a445fddf ILT |
369 | // Make a segment. This is used by the linker script code. |
370 | Output_segment* | |
371 | make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags); | |
372 | ||
373 | // Return the number of segments. | |
374 | size_t | |
375 | segment_count() const | |
376 | { return this->segment_list_.size(); } | |
377 | ||
378 | // Map from section flags to segment flags. | |
379 | static elfcpp::Elf_Word | |
380 | section_flags_to_segment(elfcpp::Elf_Xword flags); | |
381 | ||
154e0e9a ILT |
382 | // Attach sections to segments. |
383 | void | |
384 | attach_sections_to_segments(); | |
385 | ||
a2fb1b05 ILT |
386 | private: |
387 | Layout(const Layout&); | |
388 | Layout& operator=(const Layout&); | |
389 | ||
390 | // Mapping from .gnu.linkonce section names to output section names. | |
391 | struct Linkonce_mapping | |
392 | { | |
393 | const char* from; | |
394 | int fromlen; | |
395 | const char* to; | |
ead1e424 | 396 | int tolen; |
a2fb1b05 ILT |
397 | }; |
398 | static const Linkonce_mapping linkonce_mapping[]; | |
399 | static const int linkonce_mapping_count; | |
400 | ||
755ab8af ILT |
401 | // During a relocatable link, a list of group sections and |
402 | // signatures. | |
403 | struct Group_signature | |
404 | { | |
405 | // The group section. | |
406 | Output_section* section; | |
407 | // The signature. | |
408 | const char* signature; | |
409 | ||
410 | Group_signature() | |
411 | : section(NULL), signature(NULL) | |
412 | { } | |
413 | ||
414 | Group_signature(Output_section* sectiona, const char* signaturea) | |
415 | : section(sectiona), signature(signaturea) | |
416 | { } | |
417 | }; | |
418 | typedef std::vector<Group_signature> Group_signatures; | |
419 | ||
8ed814a9 ILT |
420 | // Create a .note section, filling in the header. |
421 | Output_section* | |
422 | create_note(const char* name, int note_type, size_t descsz, | |
423 | bool allocate, size_t* trailing_padding); | |
424 | ||
4f211c8b ILT |
425 | // Create a .note section for gold. |
426 | void | |
35cdfc9a ILT |
427 | create_gold_note(); |
428 | ||
429 | // Record whether the stack must be executable. | |
430 | void | |
431 | create_executable_stack_info(const Target*); | |
4f211c8b | 432 | |
8ed814a9 ILT |
433 | // Create a build ID note if needed. |
434 | void | |
435 | create_build_id(); | |
436 | ||
75f65a3e ILT |
437 | // Find the first read-only PT_LOAD segment, creating one if |
438 | // necessary. | |
439 | Output_segment* | |
440 | find_first_load_seg(); | |
441 | ||
7bf1f802 ILT |
442 | // Count the local symbols in the regular symbol table and the dynamic |
443 | // symbol table, and build the respective string pools. | |
444 | void | |
17a1d0a9 | 445 | count_local_symbols(const Task*, const Input_objects*); |
7bf1f802 | 446 | |
54dc6425 ILT |
447 | // Create the output sections for the symbol table. |
448 | void | |
d491d34e ILT |
449 | create_symtab_sections(const Input_objects*, Symbol_table*, |
450 | unsigned int, off_t*); | |
54dc6425 | 451 | |
75f65a3e ILT |
452 | // Create the .shstrtab section. |
453 | Output_section* | |
454 | create_shstrtab(); | |
455 | ||
456 | // Create the section header table. | |
27bc2bce | 457 | void |
d491d34e | 458 | create_shdrs(const Output_section* shstrtab_section, off_t*); |
54dc6425 | 459 | |
dbe717ef ILT |
460 | // Create the dynamic symbol table. |
461 | void | |
9b07f471 ILT |
462 | create_dynamic_symtab(const Input_objects*, Symbol_table*, |
463 | Output_section** pdynstr, | |
14b31740 ILT |
464 | unsigned int* plocal_dynamic_count, |
465 | std::vector<Symbol*>* pdynamic_symbols, | |
466 | Versions* versions); | |
dbe717ef | 467 | |
7bf1f802 ILT |
468 | // Assign offsets to each local portion of the dynamic symbol table. |
469 | void | |
470 | assign_local_dynsym_offsets(const Input_objects*); | |
471 | ||
a3ad94ed | 472 | // Finish the .dynamic section and PT_DYNAMIC segment. |
dbe717ef | 473 | void |
16649710 | 474 | finish_dynamic_section(const Input_objects*, const Symbol_table*); |
dbe717ef ILT |
475 | |
476 | // Create the .interp section and PT_INTERP segment. | |
477 | void | |
478 | create_interp(const Target* target); | |
479 | ||
14b31740 ILT |
480 | // Create the version sections. |
481 | void | |
9025d29d | 482 | create_version_sections(const Versions*, |
46fe1623 | 483 | const Symbol_table*, |
14b31740 ILT |
484 | unsigned int local_symcount, |
485 | const std::vector<Symbol*>& dynamic_symbols, | |
486 | const Output_section* dynstr); | |
487 | ||
488 | template<int size, bool big_endian> | |
489 | void | |
490 | sized_create_version_sections(const Versions* versions, | |
46fe1623 | 491 | const Symbol_table*, |
14b31740 ILT |
492 | unsigned int local_symcount, |
493 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 494 | const Output_section* dynstr); |
14b31740 | 495 | |
a2fb1b05 ILT |
496 | // Return whether to include this section in the link. |
497 | template<int size, bool big_endian> | |
498 | bool | |
730cdc88 | 499 | include_section(Sized_relobj<size, big_endian>* object, const char* name, |
a2fb1b05 ILT |
500 | const elfcpp::Shdr<size, big_endian>&); |
501 | ||
ead1e424 ILT |
502 | // Return the output section name to use given an input section |
503 | // name. Set *PLEN to the length of the name. *PLEN must be | |
504 | // initialized to the length of NAME. | |
505 | static const char* | |
506 | output_section_name(const char* name, size_t* plen); | |
507 | ||
a2fb1b05 | 508 | // Return the output section name to use for a linkonce section |
ead1e424 | 509 | // name. PLEN is as for output_section_name. |
a2fb1b05 | 510 | static const char* |
ead1e424 ILT |
511 | linkonce_output_name(const char* name, size_t* plen); |
512 | ||
d491d34e ILT |
513 | // Return the number of allocated output sections. |
514 | size_t | |
515 | allocated_output_section_count() const; | |
516 | ||
ead1e424 ILT |
517 | // Return the output section for NAME, TYPE and FLAGS. |
518 | Output_section* | |
f0641a0b ILT |
519 | get_output_section(const char* name, Stringpool::Key name_key, |
520 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags); | |
a2fb1b05 | 521 | |
a445fddf ILT |
522 | // Choose the output section for NAME in RELOBJ. |
523 | Output_section* | |
524 | choose_output_section(const Relobj* relobj, const char* name, | |
525 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
154e0e9a | 526 | bool is_input_section); |
a445fddf | 527 | |
a2fb1b05 ILT |
528 | // Create a new Output_section. |
529 | Output_section* | |
530 | make_output_section(const char* name, elfcpp::Elf_Word type, | |
531 | elfcpp::Elf_Xword flags); | |
532 | ||
4e2b1697 ILT |
533 | // Attach a section to a segment. |
534 | void | |
154e0e9a | 535 | attach_section_to_segment(Output_section*); |
4e2b1697 | 536 | |
154e0e9a | 537 | // Attach an allocated section to a segment. |
1650c4ff | 538 | void |
154e0e9a | 539 | attach_allocated_section_to_segment(Output_section*); |
1650c4ff | 540 | |
dbe717ef ILT |
541 | // Set the final file offsets of all the segments. |
542 | off_t | |
543 | set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx); | |
544 | ||
6a74a719 ILT |
545 | // Set the file offsets of the sections when doing a relocatable |
546 | // link. | |
547 | off_t | |
548 | set_relocatable_section_offsets(Output_data*, unsigned int* pshndx); | |
549 | ||
86887060 | 550 | // Set the final file offsets of all the sections not associated |
9a0910c3 ILT |
551 | // with a segment. We set section offsets in three passes: the |
552 | // first handles all allocated sections, the second sections that | |
17a1d0a9 ILT |
553 | // require postprocessing, and the last the late-bound STRTAB |
554 | // sections (probably only shstrtab, which is the one we care about | |
555 | // because it holds section names). | |
9a0910c3 ILT |
556 | enum Section_offset_pass |
557 | { | |
558 | BEFORE_INPUT_SECTIONS_PASS, | |
17a1d0a9 ILT |
559 | POSTPROCESSING_SECTIONS_PASS, |
560 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS | |
9a0910c3 | 561 | }; |
dbe717ef | 562 | off_t |
9a0910c3 ILT |
563 | set_section_offsets(off_t, Section_offset_pass pass); |
564 | ||
86887060 ILT |
565 | // Set the final section indexes of all the sections not associated |
566 | // with a segment. Returns the next unused index. | |
567 | unsigned int | |
568 | set_section_indexes(unsigned int pshndx); | |
dbe717ef | 569 | |
a445fddf ILT |
570 | // Set the section addresses when using a script. |
571 | Output_segment* | |
572 | set_section_addresses_from_script(Symbol_table*); | |
573 | ||
a2fb1b05 ILT |
574 | // Return whether SEG1 comes before SEG2 in the output file. |
575 | static bool | |
b3168e9d | 576 | segment_precedes(const Output_segment* seg1, const Output_segment* seg2); |
a2fb1b05 | 577 | |
a2fb1b05 | 578 | // A mapping used for group signatures. |
e94cf127 CC |
579 | struct Kept_section |
580 | { | |
581 | Kept_section() | |
582 | : object_(NULL), shndx_(0), group_(false) | |
583 | { } | |
584 | Kept_section(Relobj* object, unsigned int shndx, bool group) | |
585 | : object_(object), shndx_(shndx), group_(group) | |
586 | { } | |
587 | Relobj* object_; | |
588 | unsigned int shndx_; | |
589 | bool group_; | |
590 | }; | |
591 | typedef Unordered_map<std::string, Kept_section> Signatures; | |
a2fb1b05 ILT |
592 | |
593 | // Mapping from input section name/type/flags to output section. We | |
594 | // use canonicalized strings here. | |
595 | ||
f0641a0b | 596 | typedef std::pair<Stringpool::Key, |
a2fb1b05 ILT |
597 | std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key; |
598 | ||
599 | struct Hash_key | |
600 | { | |
601 | size_t | |
602 | operator()(const Key& k) const; | |
603 | }; | |
604 | ||
605 | typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map; | |
606 | ||
607 | // A comparison class for segments. | |
608 | ||
609 | struct Compare_segments | |
610 | { | |
611 | bool | |
612 | operator()(const Output_segment* seg1, const Output_segment* seg2) | |
613 | { return Layout::segment_precedes(seg1, seg2); } | |
614 | }; | |
615 | ||
a2fb1b05 ILT |
616 | // A reference to the options on the command line. |
617 | const General_options& options_; | |
e5756efb ILT |
618 | // Information set by scripts or by command line options. |
619 | Script_options* script_options_; | |
a2fb1b05 ILT |
620 | // The output section names. |
621 | Stringpool namepool_; | |
75f65a3e ILT |
622 | // The output symbol names. |
623 | Stringpool sympool_; | |
a3ad94ed ILT |
624 | // The dynamic strings, if needed. |
625 | Stringpool dynpool_; | |
a2fb1b05 ILT |
626 | // The list of group sections and linkonce sections which we have seen. |
627 | Signatures signatures_; | |
628 | // The mapping from input section name/type/flags to output sections. | |
629 | Section_name_map section_name_map_; | |
630 | // The list of output segments. | |
631 | Segment_list segment_list_; | |
a3ad94ed ILT |
632 | // The list of output sections. |
633 | Section_list section_list_; | |
a2fb1b05 ILT |
634 | // The list of output sections which are not attached to any output |
635 | // segment. | |
a3ad94ed | 636 | Section_list unattached_section_list_; |
154e0e9a ILT |
637 | // Whether we have attached the sections to the segments. |
638 | bool sections_are_attached_; | |
a3ad94ed ILT |
639 | // The list of unattached Output_data objects which require special |
640 | // handling because they are not Output_sections. | |
61ba1cf9 | 641 | Data_list special_output_list_; |
27bc2bce ILT |
642 | // The section headers. |
643 | Output_section_headers* section_headers_; | |
92e059d8 ILT |
644 | // A pointer to the PT_TLS segment if there is one. |
645 | Output_segment* tls_segment_; | |
9f1d377b ILT |
646 | // A pointer to the PT_GNU_RELRO segment if there is one. |
647 | Output_segment* relro_segment_; | |
a3ad94ed ILT |
648 | // The SHT_SYMTAB output section. |
649 | Output_section* symtab_section_; | |
d491d34e ILT |
650 | // The SHT_SYMTAB_SHNDX for the regular symbol table if there is one. |
651 | Output_symtab_xindex* symtab_xindex_; | |
a3ad94ed ILT |
652 | // The SHT_DYNSYM output section if there is one. |
653 | Output_section* dynsym_section_; | |
d491d34e ILT |
654 | // The SHT_SYMTAB_SHNDX for the dynamic symbol table if there is one. |
655 | Output_symtab_xindex* dynsym_xindex_; | |
a3ad94ed ILT |
656 | // The SHT_DYNAMIC output section if there is one. |
657 | Output_section* dynamic_section_; | |
16649710 ILT |
658 | // The dynamic data which goes into dynamic_section_. |
659 | Output_data_dynamic* dynamic_data_; | |
730cdc88 | 660 | // The exception frame output section if there is one. |
3151305a | 661 | Output_section* eh_frame_section_; |
730cdc88 ILT |
662 | // The exception frame data for eh_frame_section_. |
663 | Eh_frame* eh_frame_data_; | |
2c38906f ILT |
664 | // Whether we have added eh_frame_data_ to the .eh_frame section. |
665 | bool added_eh_frame_data_; | |
730cdc88 ILT |
666 | // The exception frame header output section if there is one. |
667 | Output_section* eh_frame_hdr_section_; | |
8ed814a9 ILT |
668 | // The space for the build ID checksum if there is one. |
669 | Output_section_data* build_id_note_; | |
755ab8af ILT |
670 | // A list of group sections and their signatures. |
671 | Group_signatures group_signatures_; | |
e44fcf3b ILT |
672 | // The size of the output file. |
673 | off_t output_file_size_; | |
35cdfc9a ILT |
674 | // Whether we have seen an object file marked to require an |
675 | // executable stack. | |
676 | bool input_requires_executable_stack_; | |
677 | // Whether we have seen at least one object file with an executable | |
678 | // stack marker. | |
679 | bool input_with_gnu_stack_note_; | |
680 | // Whether we have seen at least one object file without an | |
681 | // executable stack marker. | |
682 | bool input_without_gnu_stack_note_; | |
535890bb ILT |
683 | // Whether we have seen an object file that uses the static TLS model. |
684 | bool has_static_tls_; | |
17a1d0a9 ILT |
685 | // Whether any sections require postprocessing. |
686 | bool any_postprocessing_sections_; | |
61ba1cf9 ILT |
687 | }; |
688 | ||
730cdc88 ILT |
689 | // This task handles writing out data in output sections which is not |
690 | // part of an input section, or which requires special handling. When | |
691 | // this is done, it unblocks both output_sections_blocker and | |
692 | // final_blocker. | |
693 | ||
694 | class Write_sections_task : public Task | |
695 | { | |
696 | public: | |
697 | Write_sections_task(const Layout* layout, Output_file* of, | |
698 | Task_token* output_sections_blocker, | |
699 | Task_token* final_blocker) | |
700 | : layout_(layout), of_(of), | |
701 | output_sections_blocker_(output_sections_blocker), | |
702 | final_blocker_(final_blocker) | |
703 | { } | |
704 | ||
705 | // The standard Task methods. | |
706 | ||
17a1d0a9 ILT |
707 | Task_token* |
708 | is_runnable(); | |
730cdc88 | 709 | |
17a1d0a9 ILT |
710 | void |
711 | locks(Task_locker*); | |
730cdc88 ILT |
712 | |
713 | void | |
714 | run(Workqueue*); | |
715 | ||
c7912668 ILT |
716 | std::string |
717 | get_name() const | |
718 | { return "Write_sections_task"; } | |
719 | ||
730cdc88 ILT |
720 | private: |
721 | class Write_sections_locker; | |
722 | ||
723 | const Layout* layout_; | |
724 | Output_file* of_; | |
725 | Task_token* output_sections_blocker_; | |
726 | Task_token* final_blocker_; | |
727 | }; | |
728 | ||
61ba1cf9 ILT |
729 | // This task handles writing out data which is not part of a section |
730 | // or segment. | |
731 | ||
732 | class Write_data_task : public Task | |
733 | { | |
734 | public: | |
a3ad94ed | 735 | Write_data_task(const Layout* layout, const Symbol_table* symtab, |
9025d29d ILT |
736 | Output_file* of, Task_token* final_blocker) |
737 | : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker) | |
61ba1cf9 ILT |
738 | { } |
739 | ||
740 | // The standard Task methods. | |
741 | ||
17a1d0a9 ILT |
742 | Task_token* |
743 | is_runnable(); | |
61ba1cf9 | 744 | |
17a1d0a9 ILT |
745 | void |
746 | locks(Task_locker*); | |
61ba1cf9 ILT |
747 | |
748 | void | |
749 | run(Workqueue*); | |
750 | ||
c7912668 ILT |
751 | std::string |
752 | get_name() const | |
753 | { return "Write_data_task"; } | |
754 | ||
61ba1cf9 ILT |
755 | private: |
756 | const Layout* layout_; | |
a3ad94ed | 757 | const Symbol_table* symtab_; |
61ba1cf9 ILT |
758 | Output_file* of_; |
759 | Task_token* final_blocker_; | |
760 | }; | |
761 | ||
762 | // This task handles writing out the global symbols. | |
763 | ||
764 | class Write_symbols_task : public Task | |
765 | { | |
766 | public: | |
d491d34e | 767 | Write_symbols_task(const Layout* layout, const Symbol_table* symtab, |
9a2d6984 | 768 | const Input_objects* input_objects, |
16649710 ILT |
769 | const Stringpool* sympool, const Stringpool* dynpool, |
770 | Output_file* of, Task_token* final_blocker) | |
d491d34e ILT |
771 | : layout_(layout), symtab_(symtab), input_objects_(input_objects), |
772 | sympool_(sympool), dynpool_(dynpool), of_(of), | |
773 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
774 | { } |
775 | ||
776 | // The standard Task methods. | |
777 | ||
17a1d0a9 ILT |
778 | Task_token* |
779 | is_runnable(); | |
61ba1cf9 | 780 | |
17a1d0a9 ILT |
781 | void |
782 | locks(Task_locker*); | |
61ba1cf9 ILT |
783 | |
784 | void | |
785 | run(Workqueue*); | |
786 | ||
c7912668 ILT |
787 | std::string |
788 | get_name() const | |
789 | { return "Write_symbols_task"; } | |
790 | ||
61ba1cf9 | 791 | private: |
d491d34e | 792 | const Layout* layout_; |
61ba1cf9 | 793 | const Symbol_table* symtab_; |
9a2d6984 | 794 | const Input_objects* input_objects_; |
61ba1cf9 | 795 | const Stringpool* sympool_; |
16649710 | 796 | const Stringpool* dynpool_; |
61ba1cf9 ILT |
797 | Output_file* of_; |
798 | Task_token* final_blocker_; | |
799 | }; | |
800 | ||
730cdc88 ILT |
801 | // This task handles writing out data in output sections which can't |
802 | // be written out until all the input sections have been handled. | |
803 | // This is for sections whose contents is based on the contents of | |
804 | // other output sections. | |
805 | ||
806 | class Write_after_input_sections_task : public Task | |
807 | { | |
808 | public: | |
27bc2bce | 809 | Write_after_input_sections_task(Layout* layout, Output_file* of, |
730cdc88 ILT |
810 | Task_token* input_sections_blocker, |
811 | Task_token* final_blocker) | |
812 | : layout_(layout), of_(of), | |
813 | input_sections_blocker_(input_sections_blocker), | |
814 | final_blocker_(final_blocker) | |
815 | { } | |
816 | ||
817 | // The standard Task methods. | |
818 | ||
17a1d0a9 ILT |
819 | Task_token* |
820 | is_runnable(); | |
730cdc88 | 821 | |
17a1d0a9 ILT |
822 | void |
823 | locks(Task_locker*); | |
730cdc88 ILT |
824 | |
825 | void | |
826 | run(Workqueue*); | |
827 | ||
c7912668 ILT |
828 | std::string |
829 | get_name() const | |
830 | { return "Write_after_input_sections_task"; } | |
831 | ||
730cdc88 | 832 | private: |
27bc2bce | 833 | Layout* layout_; |
730cdc88 ILT |
834 | Output_file* of_; |
835 | Task_token* input_sections_blocker_; | |
836 | Task_token* final_blocker_; | |
837 | }; | |
838 | ||
92e059d8 | 839 | // This task function handles closing the file. |
61ba1cf9 | 840 | |
92e059d8 | 841 | class Close_task_runner : public Task_function_runner |
61ba1cf9 ILT |
842 | { |
843 | public: | |
516cb3d0 ILT |
844 | Close_task_runner(const General_options* options, const Layout* layout, |
845 | Output_file* of) | |
846 | : options_(options), layout_(layout), of_(of) | |
61ba1cf9 ILT |
847 | { } |
848 | ||
92e059d8 | 849 | // Run the operation. |
61ba1cf9 | 850 | void |
17a1d0a9 | 851 | run(Workqueue*, const Task*); |
61ba1cf9 ILT |
852 | |
853 | private: | |
516cb3d0 ILT |
854 | const General_options* options_; |
855 | const Layout* layout_; | |
61ba1cf9 | 856 | Output_file* of_; |
a2fb1b05 ILT |
857 | }; |
858 | ||
ead1e424 ILT |
859 | // A small helper function to align an address. |
860 | ||
861 | inline uint64_t | |
862 | align_address(uint64_t address, uint64_t addralign) | |
863 | { | |
864 | if (addralign != 0) | |
865 | address = (address + addralign - 1) &~ (addralign - 1); | |
866 | return address; | |
867 | } | |
868 | ||
a2fb1b05 ILT |
869 | } // End namespace gold. |
870 | ||
871 | #endif // !defined(GOLD_LAYOUT_H) |