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a2fb1b05 ILT |
1 | // output.h -- manage the output file for gold -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
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_OUTPUT_H |
24 | #define GOLD_OUTPUT_H | |
25 | ||
26 | #include <list> | |
ead1e424 | 27 | #include <vector> |
a2fb1b05 ILT |
28 | |
29 | #include "elfcpp.h" | |
54dc6425 | 30 | #include "layout.h" |
c06b7b0b | 31 | #include "reloc-types.h" |
a2fb1b05 ILT |
32 | |
33 | namespace gold | |
34 | { | |
35 | ||
61ba1cf9 | 36 | class General_options; |
a2fb1b05 | 37 | class Object; |
a3ad94ed | 38 | class Symbol; |
a2fb1b05 | 39 | class Output_file; |
c06b7b0b | 40 | class Output_section; |
a3ad94ed | 41 | class Target; |
54dc6425 ILT |
42 | template<int size, bool big_endian> |
43 | class Sized_target; | |
c06b7b0b ILT |
44 | template<int size, bool big_endian> |
45 | class Sized_relobj; | |
54dc6425 ILT |
46 | |
47 | // An abtract class for data which has to go into the output file. | |
a2fb1b05 ILT |
48 | |
49 | class Output_data | |
50 | { | |
51 | public: | |
27bc2bce ILT |
52 | explicit Output_data() |
53 | : address_(0), data_size_(0), offset_(-1), | |
54 | is_address_valid_(false), is_data_size_valid_(false), | |
55 | is_offset_valid_(false), | |
4f4c5f80 | 56 | dynamic_reloc_count_(0) |
a2fb1b05 ILT |
57 | { } |
58 | ||
59 | virtual | |
60 | ~Output_data(); | |
61 | ||
27bc2bce ILT |
62 | // Return the address. For allocated sections, this is only valid |
63 | // after Layout::finalize is finished. | |
75f65a3e ILT |
64 | uint64_t |
65 | address() const | |
27bc2bce ILT |
66 | { |
67 | gold_assert(this->is_address_valid_); | |
68 | return this->address_; | |
69 | } | |
75f65a3e | 70 | |
27bc2bce ILT |
71 | // Return the size of the data. For allocated sections, this must |
72 | // be valid after Layout::finalize calls set_address, but need not | |
73 | // be valid before then. | |
a2fb1b05 | 74 | off_t |
75f65a3e | 75 | data_size() const |
27bc2bce ILT |
76 | { |
77 | gold_assert(this->is_data_size_valid_); | |
78 | return this->data_size_; | |
79 | } | |
75f65a3e | 80 | |
ead1e424 | 81 | // Return the file offset. This is only valid after |
27bc2bce ILT |
82 | // Layout::finalize is finished. For some non-allocated sections, |
83 | // it may not be valid until near the end of the link. | |
75f65a3e ILT |
84 | off_t |
85 | offset() const | |
27bc2bce ILT |
86 | { |
87 | gold_assert(this->is_offset_valid_); | |
88 | return this->offset_; | |
89 | } | |
75f65a3e ILT |
90 | |
91 | // Return the required alignment. | |
92 | uint64_t | |
93 | addralign() const | |
94 | { return this->do_addralign(); } | |
95 | ||
96 | // Return whether this is an Output_section. | |
97 | bool | |
98 | is_section() const | |
99 | { return this->do_is_section(); } | |
100 | ||
101 | // Return whether this is an Output_section of the specified type. | |
102 | bool | |
103 | is_section_type(elfcpp::Elf_Word stt) const | |
104 | { return this->do_is_section_type(stt); } | |
105 | ||
106 | // Return whether this is an Output_section with the specified flag | |
107 | // set. | |
108 | bool | |
109 | is_section_flag_set(elfcpp::Elf_Xword shf) const | |
110 | { return this->do_is_section_flag_set(shf); } | |
111 | ||
ead1e424 ILT |
112 | // Return the output section index, if there is an output section. |
113 | unsigned int | |
114 | out_shndx() const | |
115 | { return this->do_out_shndx(); } | |
116 | ||
117 | // Set the output section index, if this is an output section. | |
118 | void | |
119 | set_out_shndx(unsigned int shndx) | |
120 | { this->do_set_out_shndx(shndx); } | |
121 | ||
27bc2bce ILT |
122 | // Set the address and file offset of this data, and finalize the |
123 | // size of the data. This is called during Layout::finalize for | |
124 | // allocated sections. | |
75f65a3e | 125 | void |
27bc2bce ILT |
126 | set_address_and_file_offset(uint64_t addr, off_t off) |
127 | { | |
128 | this->set_address(addr); | |
129 | this->set_file_offset(off); | |
130 | this->finalize_data_size(); | |
131 | } | |
132 | ||
133 | // Set the address. | |
134 | void | |
135 | set_address(uint64_t addr) | |
136 | { | |
137 | gold_assert(!this->is_address_valid_); | |
138 | this->address_ = addr; | |
139 | this->is_address_valid_ = true; | |
140 | } | |
141 | ||
142 | // Set the file offset. | |
143 | void | |
144 | set_file_offset(off_t off) | |
145 | { | |
146 | gold_assert(!this->is_offset_valid_); | |
147 | this->offset_ = off; | |
148 | this->is_offset_valid_ = true; | |
149 | } | |
150 | ||
151 | // Finalize the data size. | |
152 | void | |
153 | finalize_data_size() | |
154 | { | |
155 | if (!this->is_data_size_valid_) | |
156 | { | |
157 | // Tell the child class to set the data size. | |
158 | this->set_final_data_size(); | |
159 | gold_assert(this->is_data_size_valid_); | |
160 | } | |
161 | } | |
75f65a3e | 162 | |
7bf1f802 ILT |
163 | // Set the TLS offset. Called only for SHT_TLS sections. |
164 | void | |
165 | set_tls_offset(uint64_t tls_base) | |
166 | { this->do_set_tls_offset(tls_base); } | |
167 | ||
168 | // Return the TLS offset, relative to the base of the TLS segment. | |
169 | // Valid only for SHT_TLS sections. | |
170 | uint64_t | |
171 | tls_offset() const | |
172 | { return this->do_tls_offset(); } | |
173 | ||
ead1e424 ILT |
174 | // Write the data to the output file. This is called after |
175 | // Layout::finalize is complete. | |
75f65a3e ILT |
176 | void |
177 | write(Output_file* file) | |
178 | { this->do_write(file); } | |
a2fb1b05 | 179 | |
27bc2bce ILT |
180 | // This is called by Layout::finalize to note that the sizes of |
181 | // allocated sections must now be fixed. | |
a3ad94ed ILT |
182 | static void |
183 | layout_complete() | |
27bc2bce | 184 | { Output_data::allocated_sizes_are_fixed = true; } |
a3ad94ed | 185 | |
730cdc88 ILT |
186 | // Used to check that layout has been done. |
187 | static bool | |
188 | is_layout_complete() | |
27bc2bce | 189 | { return Output_data::allocated_sizes_are_fixed; } |
730cdc88 | 190 | |
4f4c5f80 ILT |
191 | // Count the number of dynamic relocations applied to this section. |
192 | void | |
193 | add_dynamic_reloc() | |
194 | { ++this->dynamic_reloc_count_; } | |
195 | ||
196 | // Return the number of dynamic relocations applied to this section. | |
197 | unsigned int | |
198 | dynamic_reloc_count() const | |
199 | { return this->dynamic_reloc_count_; } | |
200 | ||
75f65a3e ILT |
201 | protected: |
202 | // Functions that child classes may or in some cases must implement. | |
203 | ||
204 | // Write the data to the output file. | |
a2fb1b05 | 205 | virtual void |
75f65a3e ILT |
206 | do_write(Output_file*) = 0; |
207 | ||
208 | // Return the required alignment. | |
209 | virtual uint64_t | |
210 | do_addralign() const = 0; | |
211 | ||
212 | // Return whether this is an Output_section. | |
213 | virtual bool | |
214 | do_is_section() const | |
215 | { return false; } | |
a2fb1b05 | 216 | |
54dc6425 | 217 | // Return whether this is an Output_section of the specified type. |
75f65a3e | 218 | // This only needs to be implement by Output_section. |
54dc6425 | 219 | virtual bool |
75f65a3e | 220 | do_is_section_type(elfcpp::Elf_Word) const |
54dc6425 ILT |
221 | { return false; } |
222 | ||
75f65a3e ILT |
223 | // Return whether this is an Output_section with the specific flag |
224 | // set. This only needs to be implemented by Output_section. | |
54dc6425 | 225 | virtual bool |
75f65a3e | 226 | do_is_section_flag_set(elfcpp::Elf_Xword) const |
54dc6425 ILT |
227 | { return false; } |
228 | ||
ead1e424 ILT |
229 | // Return the output section index, if there is an output section. |
230 | virtual unsigned int | |
231 | do_out_shndx() const | |
a3ad94ed | 232 | { gold_unreachable(); } |
ead1e424 ILT |
233 | |
234 | // Set the output section index, if this is an output section. | |
235 | virtual void | |
236 | do_set_out_shndx(unsigned int) | |
a3ad94ed | 237 | { gold_unreachable(); } |
ead1e424 | 238 | |
27bc2bce ILT |
239 | // This is a hook for derived classes to set the data size. This is |
240 | // called by finalize_data_size, normally called during | |
241 | // Layout::finalize, when the section address is set. | |
75f65a3e | 242 | virtual void |
27bc2bce ILT |
243 | set_final_data_size() |
244 | { gold_unreachable(); } | |
75f65a3e | 245 | |
7bf1f802 ILT |
246 | // Set the TLS offset. Called only for SHT_TLS sections. |
247 | virtual void | |
248 | do_set_tls_offset(uint64_t) | |
249 | { gold_unreachable(); } | |
250 | ||
251 | // Return the TLS offset, relative to the base of the TLS segment. | |
252 | // Valid only for SHT_TLS sections. | |
253 | virtual uint64_t | |
254 | do_tls_offset() const | |
255 | { gold_unreachable(); } | |
256 | ||
75f65a3e ILT |
257 | // Functions that child classes may call. |
258 | ||
27bc2bce ILT |
259 | // Whether the address is valid. |
260 | bool | |
261 | is_address_valid() const | |
262 | { return this->is_address_valid_; } | |
263 | ||
264 | // Whether the file offset is valid. | |
265 | bool | |
266 | is_offset_valid() const | |
267 | { return this->is_offset_valid_; } | |
268 | ||
269 | // Whether the data size is valid. | |
270 | bool | |
271 | is_data_size_valid() const | |
272 | { return this->is_data_size_valid_; } | |
273 | ||
a2fb1b05 ILT |
274 | // Set the size of the data. |
275 | void | |
75f65a3e | 276 | set_data_size(off_t data_size) |
a3ad94ed | 277 | { |
27bc2bce ILT |
278 | gold_assert(!this->is_data_size_valid_); |
279 | this->data_size_ = data_size; | |
280 | this->is_data_size_valid_ = true; | |
281 | } | |
282 | ||
283 | // Get the current data size--this is for the convenience of | |
284 | // sections which build up their size over time. | |
285 | off_t | |
286 | current_data_size_for_child() const | |
287 | { return this->data_size_; } | |
288 | ||
289 | // Set the current data size--this is for the convenience of | |
290 | // sections which build up their size over time. | |
291 | void | |
292 | set_current_data_size_for_child(off_t data_size) | |
293 | { | |
294 | gold_assert(!this->is_data_size_valid_); | |
a3ad94ed ILT |
295 | this->data_size_ = data_size; |
296 | } | |
75f65a3e | 297 | |
730cdc88 ILT |
298 | // Return default alignment for the target size. |
299 | static uint64_t | |
300 | default_alignment(); | |
301 | ||
302 | // Return default alignment for a specified size--32 or 64. | |
75f65a3e | 303 | static uint64_t |
730cdc88 | 304 | default_alignment_for_size(int size); |
a2fb1b05 ILT |
305 | |
306 | private: | |
307 | Output_data(const Output_data&); | |
308 | Output_data& operator=(const Output_data&); | |
309 | ||
a3ad94ed | 310 | // This is used for verification, to make sure that we don't try to |
27bc2bce ILT |
311 | // change any sizes of allocated sections after we set the section |
312 | // addresses. | |
313 | static bool allocated_sizes_are_fixed; | |
a3ad94ed | 314 | |
27bc2bce | 315 | // Memory address in output file. |
75f65a3e | 316 | uint64_t address_; |
27bc2bce | 317 | // Size of data in output file. |
75f65a3e | 318 | off_t data_size_; |
27bc2bce | 319 | // File offset of contents in output file. |
75f65a3e | 320 | off_t offset_; |
27bc2bce ILT |
321 | // Whether address_ is valid. |
322 | bool is_address_valid_; | |
323 | // Whether data_size_ is valid. | |
324 | bool is_data_size_valid_; | |
325 | // Whether offset_ is valid. | |
326 | bool is_offset_valid_; | |
4f4c5f80 ILT |
327 | // Count of dynamic relocations applied to this section. |
328 | unsigned int dynamic_reloc_count_; | |
a2fb1b05 ILT |
329 | }; |
330 | ||
54dc6425 ILT |
331 | // Output the section headers. |
332 | ||
333 | class Output_section_headers : public Output_data | |
334 | { | |
335 | public: | |
9025d29d | 336 | Output_section_headers(const Layout*, |
16649710 ILT |
337 | const Layout::Segment_list*, |
338 | const Layout::Section_list*, | |
61ba1cf9 | 339 | const Stringpool*); |
54dc6425 | 340 | |
27bc2bce | 341 | protected: |
54dc6425 ILT |
342 | // Write the data to the file. |
343 | void | |
75f65a3e ILT |
344 | do_write(Output_file*); |
345 | ||
346 | // Return the required alignment. | |
347 | uint64_t | |
348 | do_addralign() const | |
730cdc88 | 349 | { return Output_data::default_alignment(); } |
54dc6425 ILT |
350 | |
351 | private: | |
61ba1cf9 ILT |
352 | // Write the data to the file with the right size and endianness. |
353 | template<int size, bool big_endian> | |
354 | void | |
355 | do_sized_write(Output_file*); | |
356 | ||
16649710 ILT |
357 | const Layout* layout_; |
358 | const Layout::Segment_list* segment_list_; | |
359 | const Layout::Section_list* unattached_section_list_; | |
61ba1cf9 | 360 | const Stringpool* secnamepool_; |
54dc6425 ILT |
361 | }; |
362 | ||
363 | // Output the segment headers. | |
364 | ||
365 | class Output_segment_headers : public Output_data | |
366 | { | |
367 | public: | |
9025d29d | 368 | Output_segment_headers(const Layout::Segment_list& segment_list); |
54dc6425 | 369 | |
27bc2bce | 370 | protected: |
54dc6425 ILT |
371 | // Write the data to the file. |
372 | void | |
75f65a3e ILT |
373 | do_write(Output_file*); |
374 | ||
375 | // Return the required alignment. | |
376 | uint64_t | |
377 | do_addralign() const | |
730cdc88 | 378 | { return Output_data::default_alignment(); } |
54dc6425 ILT |
379 | |
380 | private: | |
61ba1cf9 ILT |
381 | // Write the data to the file with the right size and endianness. |
382 | template<int size, bool big_endian> | |
383 | void | |
384 | do_sized_write(Output_file*); | |
385 | ||
54dc6425 ILT |
386 | const Layout::Segment_list& segment_list_; |
387 | }; | |
388 | ||
389 | // Output the ELF file header. | |
390 | ||
391 | class Output_file_header : public Output_data | |
392 | { | |
393 | public: | |
9025d29d | 394 | Output_file_header(const Target*, |
54dc6425 | 395 | const Symbol_table*, |
75f65a3e ILT |
396 | const Output_segment_headers*); |
397 | ||
398 | // Add information about the section headers. We lay out the ELF | |
399 | // file header before we create the section headers. | |
400 | void set_section_info(const Output_section_headers*, | |
401 | const Output_section* shstrtab); | |
54dc6425 | 402 | |
27bc2bce | 403 | protected: |
54dc6425 ILT |
404 | // Write the data to the file. |
405 | void | |
75f65a3e ILT |
406 | do_write(Output_file*); |
407 | ||
408 | // Return the required alignment. | |
409 | uint64_t | |
410 | do_addralign() const | |
730cdc88 | 411 | { return Output_data::default_alignment(); } |
75f65a3e | 412 | |
54dc6425 | 413 | private: |
61ba1cf9 ILT |
414 | // Write the data to the file with the right size and endianness. |
415 | template<int size, bool big_endian> | |
416 | void | |
417 | do_sized_write(Output_file*); | |
418 | ||
54dc6425 ILT |
419 | const Target* target_; |
420 | const Symbol_table* symtab_; | |
61ba1cf9 | 421 | const Output_segment_headers* segment_header_; |
54dc6425 ILT |
422 | const Output_section_headers* section_header_; |
423 | const Output_section* shstrtab_; | |
424 | }; | |
425 | ||
ead1e424 ILT |
426 | // Output sections are mainly comprised of input sections. However, |
427 | // there are cases where we have data to write out which is not in an | |
428 | // input section. Output_section_data is used in such cases. This is | |
429 | // an abstract base class. | |
430 | ||
431 | class Output_section_data : public Output_data | |
432 | { | |
433 | public: | |
434 | Output_section_data(off_t data_size, uint64_t addralign) | |
27bc2bce ILT |
435 | : Output_data(), output_section_(NULL), addralign_(addralign) |
436 | { this->set_data_size(data_size); } | |
ead1e424 ILT |
437 | |
438 | Output_section_data(uint64_t addralign) | |
27bc2bce | 439 | : Output_data(), output_section_(NULL), addralign_(addralign) |
ead1e424 ILT |
440 | { } |
441 | ||
16649710 ILT |
442 | // Return the output section. |
443 | const Output_section* | |
444 | output_section() const | |
445 | { return this->output_section_; } | |
446 | ||
ead1e424 ILT |
447 | // Record the output section. |
448 | void | |
16649710 | 449 | set_output_section(Output_section* os); |
ead1e424 | 450 | |
b8e6aad9 ILT |
451 | // Add an input section, for SHF_MERGE sections. This returns true |
452 | // if the section was handled. | |
453 | bool | |
454 | add_input_section(Relobj* object, unsigned int shndx) | |
455 | { return this->do_add_input_section(object, shndx); } | |
456 | ||
457 | // Given an input OBJECT, an input section index SHNDX within that | |
458 | // object, and an OFFSET relative to the start of that input | |
730cdc88 ILT |
459 | // section, return whether or not the corresponding offset within |
460 | // the output section is known. If this function returns true, it | |
461 | // sets *POUTPUT to the output offset. The value -1 indicates that | |
462 | // this input offset is being discarded. | |
b8e6aad9 | 463 | virtual bool |
730cdc88 ILT |
464 | output_offset(const Relobj* object, unsigned int shndx, off_t offset, |
465 | off_t *poutput) const | |
466 | { return this->do_output_offset(object, shndx, offset, poutput); } | |
b8e6aad9 | 467 | |
96803768 ILT |
468 | // Write the contents to a buffer. This is used for sections which |
469 | // require postprocessing, such as compression. | |
470 | void | |
471 | write_to_buffer(unsigned char* buffer) | |
472 | { this->do_write_to_buffer(buffer); } | |
473 | ||
ead1e424 ILT |
474 | protected: |
475 | // The child class must implement do_write. | |
476 | ||
16649710 ILT |
477 | // The child class may implement specific adjustments to the output |
478 | // section. | |
479 | virtual void | |
480 | do_adjust_output_section(Output_section*) | |
481 | { } | |
482 | ||
b8e6aad9 ILT |
483 | // May be implemented by child class. Return true if the section |
484 | // was handled. | |
485 | virtual bool | |
486 | do_add_input_section(Relobj*, unsigned int) | |
487 | { gold_unreachable(); } | |
488 | ||
730cdc88 | 489 | // The child class may implement output_offset. |
b8e6aad9 | 490 | virtual bool |
730cdc88 | 491 | do_output_offset(const Relobj*, unsigned int, off_t, off_t*) const |
b8e6aad9 ILT |
492 | { return false; } |
493 | ||
96803768 ILT |
494 | // The child class may implement write_to_buffer. Most child |
495 | // classes can not appear in a compressed section, and they do not | |
496 | // implement this. | |
497 | virtual void | |
498 | do_write_to_buffer(unsigned char*) | |
499 | { gold_unreachable(); } | |
500 | ||
ead1e424 ILT |
501 | // Return the required alignment. |
502 | uint64_t | |
503 | do_addralign() const | |
504 | { return this->addralign_; } | |
505 | ||
506 | // Return the section index of the output section. | |
507 | unsigned int | |
508 | do_out_shndx() const; | |
509 | ||
5a6f7e2d ILT |
510 | // Set the alignment. |
511 | void | |
512 | set_addralign(uint64_t addralign) | |
513 | { this->addralign_ = addralign; } | |
514 | ||
ead1e424 ILT |
515 | private: |
516 | // The output section for this section. | |
517 | const Output_section* output_section_; | |
518 | // The required alignment. | |
519 | uint64_t addralign_; | |
520 | }; | |
521 | ||
27bc2bce ILT |
522 | // Some Output_section_data classes build up their data step by step, |
523 | // rather than all at once. This class provides an interface for | |
524 | // them. | |
525 | ||
526 | class Output_section_data_build : public Output_section_data | |
527 | { | |
528 | public: | |
529 | Output_section_data_build(uint64_t addralign) | |
530 | : Output_section_data(addralign) | |
531 | { } | |
532 | ||
533 | // Get the current data size. | |
534 | off_t | |
535 | current_data_size() const | |
536 | { return this->current_data_size_for_child(); } | |
537 | ||
538 | // Set the current data size. | |
539 | void | |
540 | set_current_data_size(off_t data_size) | |
541 | { this->set_current_data_size_for_child(data_size); } | |
542 | ||
543 | protected: | |
544 | // Set the final data size. | |
545 | virtual void | |
546 | set_final_data_size() | |
547 | { this->set_data_size(this->current_data_size_for_child()); } | |
548 | }; | |
549 | ||
dbe717ef ILT |
550 | // A simple case of Output_data in which we have constant data to |
551 | // output. | |
ead1e424 | 552 | |
dbe717ef | 553 | class Output_data_const : public Output_section_data |
ead1e424 ILT |
554 | { |
555 | public: | |
dbe717ef ILT |
556 | Output_data_const(const std::string& data, uint64_t addralign) |
557 | : Output_section_data(data.size(), addralign), data_(data) | |
558 | { } | |
559 | ||
560 | Output_data_const(const char* p, off_t len, uint64_t addralign) | |
561 | : Output_section_data(len, addralign), data_(p, len) | |
562 | { } | |
563 | ||
564 | Output_data_const(const unsigned char* p, off_t len, uint64_t addralign) | |
565 | : Output_section_data(len, addralign), | |
566 | data_(reinterpret_cast<const char*>(p), len) | |
567 | { } | |
568 | ||
27bc2bce | 569 | protected: |
a3ad94ed | 570 | // Write the data to the output file. |
dbe717ef | 571 | void |
a3ad94ed | 572 | do_write(Output_file*); |
dbe717ef | 573 | |
96803768 ILT |
574 | // Write the data to a buffer. |
575 | void | |
576 | do_write_to_buffer(unsigned char* buffer) | |
577 | { memcpy(buffer, this->data_.data(), this->data_.size()); } | |
578 | ||
dbe717ef ILT |
579 | private: |
580 | std::string data_; | |
581 | }; | |
582 | ||
a3ad94ed ILT |
583 | // Another version of Output_data with constant data, in which the |
584 | // buffer is allocated by the caller. | |
dbe717ef | 585 | |
a3ad94ed | 586 | class Output_data_const_buffer : public Output_section_data |
dbe717ef ILT |
587 | { |
588 | public: | |
a3ad94ed ILT |
589 | Output_data_const_buffer(const unsigned char* p, off_t len, |
590 | uint64_t addralign) | |
591 | : Output_section_data(len, addralign), p_(p) | |
592 | { } | |
593 | ||
27bc2bce | 594 | protected: |
a3ad94ed ILT |
595 | // Write the data the output file. |
596 | void | |
597 | do_write(Output_file*); | |
598 | ||
96803768 ILT |
599 | // Write the data to a buffer. |
600 | void | |
601 | do_write_to_buffer(unsigned char* buffer) | |
602 | { memcpy(buffer, this->p_, this->data_size()); } | |
603 | ||
a3ad94ed ILT |
604 | private: |
605 | const unsigned char* p_; | |
606 | }; | |
607 | ||
27bc2bce ILT |
608 | // A place holder for a fixed amount of data written out via some |
609 | // other mechanism. | |
a3ad94ed | 610 | |
27bc2bce | 611 | class Output_data_fixed_space : public Output_section_data |
a3ad94ed ILT |
612 | { |
613 | public: | |
27bc2bce | 614 | Output_data_fixed_space(off_t data_size, uint64_t addralign) |
a3ad94ed ILT |
615 | : Output_section_data(data_size, addralign) |
616 | { } | |
617 | ||
27bc2bce ILT |
618 | protected: |
619 | // Write out the data--the actual data must be written out | |
620 | // elsewhere. | |
621 | void | |
622 | do_write(Output_file*) | |
ead1e424 | 623 | { } |
27bc2bce | 624 | }; |
ead1e424 | 625 | |
27bc2bce ILT |
626 | // A place holder for variable sized data written out via some other |
627 | // mechanism. | |
628 | ||
629 | class Output_data_space : public Output_section_data_build | |
630 | { | |
631 | public: | |
632 | explicit Output_data_space(uint64_t addralign) | |
633 | : Output_section_data_build(addralign) | |
634 | { } | |
ead1e424 | 635 | |
5a6f7e2d ILT |
636 | // Set the alignment. |
637 | void | |
638 | set_space_alignment(uint64_t align) | |
639 | { this->set_addralign(align); } | |
640 | ||
27bc2bce ILT |
641 | protected: |
642 | // Write out the data--the actual data must be written out | |
643 | // elsewhere. | |
ead1e424 ILT |
644 | void |
645 | do_write(Output_file*) | |
646 | { } | |
647 | }; | |
648 | ||
a3ad94ed ILT |
649 | // A string table which goes into an output section. |
650 | ||
651 | class Output_data_strtab : public Output_section_data | |
652 | { | |
653 | public: | |
654 | Output_data_strtab(Stringpool* strtab) | |
655 | : Output_section_data(1), strtab_(strtab) | |
656 | { } | |
657 | ||
27bc2bce | 658 | protected: |
a3ad94ed ILT |
659 | // This is called to set the address and file offset. Here we make |
660 | // sure that the Stringpool is finalized. | |
661 | void | |
27bc2bce | 662 | set_final_data_size(); |
a3ad94ed ILT |
663 | |
664 | // Write out the data. | |
665 | void | |
666 | do_write(Output_file*); | |
667 | ||
96803768 ILT |
668 | // Write the data to a buffer. |
669 | void | |
670 | do_write_to_buffer(unsigned char* buffer) | |
671 | { this->strtab_->write_to_buffer(buffer, this->data_size()); } | |
672 | ||
a3ad94ed ILT |
673 | private: |
674 | Stringpool* strtab_; | |
675 | }; | |
676 | ||
c06b7b0b ILT |
677 | // This POD class is used to represent a single reloc in the output |
678 | // file. This could be a private class within Output_data_reloc, but | |
679 | // the templatization is complex enough that I broke it out into a | |
680 | // separate class. The class is templatized on either elfcpp::SHT_REL | |
681 | // or elfcpp::SHT_RELA, and also on whether this is a dynamic | |
682 | // relocation or an ordinary relocation. | |
683 | ||
684 | // A relocation can be against a global symbol, a local symbol, an | |
685 | // output section, or the undefined symbol at index 0. We represent | |
686 | // the latter by using a NULL global symbol. | |
687 | ||
688 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
689 | class Output_reloc; | |
690 | ||
691 | template<bool dynamic, int size, bool big_endian> | |
692 | class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> | |
693 | { | |
694 | public: | |
695 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
696 | ||
697 | // An uninitialized entry. We need this because we want to put | |
698 | // instances of this class into an STL container. | |
699 | Output_reloc() | |
700 | : local_sym_index_(INVALID_CODE) | |
701 | { } | |
702 | ||
703 | // A reloc against a global symbol. | |
5a6f7e2d | 704 | |
a3ad94ed | 705 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
7bf1f802 | 706 | Address address); |
5a6f7e2d ILT |
707 | |
708 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, | |
7bf1f802 | 709 | unsigned int shndx, Address address); |
c06b7b0b ILT |
710 | |
711 | // A reloc against a local symbol. | |
5a6f7e2d ILT |
712 | |
713 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
7bf1f802 ILT |
714 | unsigned int local_sym_index, unsigned int type, |
715 | Output_data* od, Address address); | |
5a6f7e2d ILT |
716 | |
717 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
7bf1f802 ILT |
718 | unsigned int local_sym_index, unsigned int type, |
719 | unsigned int shndx, Address address); | |
c06b7b0b ILT |
720 | |
721 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 722 | |
a3ad94ed | 723 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
7bf1f802 | 724 | Address address); |
5a6f7e2d ILT |
725 | |
726 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, | |
7bf1f802 | 727 | unsigned int shndx, Address address); |
c06b7b0b ILT |
728 | |
729 | // Write the reloc entry to an output view. | |
730 | void | |
731 | write(unsigned char* pov) const; | |
732 | ||
733 | // Write the offset and info fields to Write_rel. | |
734 | template<typename Write_rel> | |
735 | void write_rel(Write_rel*) const; | |
736 | ||
737 | private: | |
738 | // Return the symbol index. We can't do a double template | |
739 | // specialization, so we do a secondary template here. | |
740 | unsigned int | |
741 | get_symbol_index() const; | |
742 | ||
743 | // Codes for local_sym_index_. | |
744 | enum | |
745 | { | |
746 | // Global symbol. | |
747 | GSYM_CODE = -1U, | |
748 | // Output section. | |
749 | SECTION_CODE = -2U, | |
750 | // Invalid uninitialized entry. | |
751 | INVALID_CODE = -3U | |
752 | }; | |
753 | ||
754 | union | |
755 | { | |
756 | // For a local symbol, the object. We will never generate a | |
757 | // relocation against a local symbol in a dynamic object; that | |
758 | // doesn't make sense. And our callers will always be | |
759 | // templatized, so we use Sized_relobj here. | |
5a6f7e2d | 760 | Sized_relobj<size, big_endian>* relobj; |
c06b7b0b ILT |
761 | // For a global symbol, the symbol. If this is NULL, it indicates |
762 | // a relocation against the undefined 0 symbol. | |
763 | Symbol* gsym; | |
764 | // For a relocation against an output section, the output section. | |
765 | Output_section* os; | |
5a6f7e2d ILT |
766 | } u1_; |
767 | union | |
768 | { | |
769 | // If shndx_ is not INVALID CODE, the object which holds the input | |
770 | // section being used to specify the reloc address. | |
771 | Relobj* relobj; | |
772 | // If shndx_ is INVALID_CODE, the output data being used to | |
773 | // specify the reloc address. This may be NULL if the reloc | |
774 | // address is absolute. | |
775 | Output_data* od; | |
776 | } u2_; | |
777 | // The address offset within the input section or the Output_data. | |
778 | Address address_; | |
c06b7b0b ILT |
779 | // For a local symbol, the local symbol index. This is GSYM_CODE |
780 | // for a global symbol, or INVALID_CODE for an uninitialized value. | |
781 | unsigned int local_sym_index_; | |
a3ad94ed | 782 | // The reloc type--a processor specific code. |
c06b7b0b | 783 | unsigned int type_; |
5a6f7e2d ILT |
784 | // If the reloc address is an input section in an object, the |
785 | // section index. This is INVALID_CODE if the reloc address is | |
786 | // specified in some other way. | |
787 | unsigned int shndx_; | |
c06b7b0b ILT |
788 | }; |
789 | ||
790 | // The SHT_RELA version of Output_reloc<>. This is just derived from | |
791 | // the SHT_REL version of Output_reloc, but it adds an addend. | |
792 | ||
793 | template<bool dynamic, int size, bool big_endian> | |
794 | class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
795 | { | |
796 | public: | |
797 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
798 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
799 | ||
800 | // An uninitialized entry. | |
801 | Output_reloc() | |
802 | : rel_() | |
803 | { } | |
804 | ||
805 | // A reloc against a global symbol. | |
5a6f7e2d | 806 | |
a3ad94ed ILT |
807 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
808 | Address address, Addend addend) | |
809 | : rel_(gsym, type, od, address), addend_(addend) | |
c06b7b0b ILT |
810 | { } |
811 | ||
5a6f7e2d ILT |
812 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, |
813 | unsigned int shndx, Address address, Addend addend) | |
814 | : rel_(gsym, type, relobj, shndx, address), addend_(addend) | |
815 | { } | |
816 | ||
c06b7b0b | 817 | // A reloc against a local symbol. |
5a6f7e2d ILT |
818 | |
819 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
c06b7b0b | 820 | unsigned int local_sym_index, |
a3ad94ed ILT |
821 | unsigned int type, Output_data* od, Address address, |
822 | Addend addend) | |
5a6f7e2d ILT |
823 | : rel_(relobj, local_sym_index, type, od, address), addend_(addend) |
824 | { } | |
825 | ||
826 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
827 | unsigned int local_sym_index, | |
828 | unsigned int type, | |
829 | unsigned int shndx, | |
830 | Address address, | |
831 | Addend addend) | |
832 | : rel_(relobj, local_sym_index, type, shndx, address), | |
833 | addend_(addend) | |
c06b7b0b ILT |
834 | { } |
835 | ||
836 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 837 | |
a3ad94ed ILT |
838 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
839 | Address address, Addend addend) | |
840 | : rel_(os, type, od, address), addend_(addend) | |
c06b7b0b ILT |
841 | { } |
842 | ||
5a6f7e2d ILT |
843 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, |
844 | unsigned int shndx, Address address, Addend addend) | |
845 | : rel_(os, type, relobj, shndx, address), addend_(addend) | |
846 | { } | |
847 | ||
c06b7b0b ILT |
848 | // Write the reloc entry to an output view. |
849 | void | |
850 | write(unsigned char* pov) const; | |
851 | ||
852 | private: | |
853 | // The basic reloc. | |
854 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_; | |
855 | // The addend. | |
856 | Addend addend_; | |
857 | }; | |
858 | ||
859 | // Output_data_reloc is used to manage a section containing relocs. | |
860 | // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC | |
861 | // indicates whether this is a dynamic relocation or a normal | |
862 | // relocation. Output_data_reloc_base is a base class. | |
863 | // Output_data_reloc is the real class, which we specialize based on | |
864 | // the reloc type. | |
865 | ||
866 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
27bc2bce | 867 | class Output_data_reloc_base : public Output_section_data_build |
c06b7b0b ILT |
868 | { |
869 | public: | |
870 | typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type; | |
871 | typedef typename Output_reloc_type::Address Address; | |
872 | static const int reloc_size = | |
873 | Reloc_types<sh_type, size, big_endian>::reloc_size; | |
874 | ||
875 | // Construct the section. | |
876 | Output_data_reloc_base() | |
27bc2bce | 877 | : Output_section_data_build(Output_data::default_alignment_for_size(size)) |
c06b7b0b ILT |
878 | { } |
879 | ||
27bc2bce | 880 | protected: |
c06b7b0b ILT |
881 | // Write out the data. |
882 | void | |
883 | do_write(Output_file*); | |
884 | ||
16649710 ILT |
885 | // Set the entry size and the link. |
886 | void | |
887 | do_adjust_output_section(Output_section *os); | |
888 | ||
c06b7b0b ILT |
889 | // Add a relocation entry. |
890 | void | |
4f4c5f80 | 891 | add(Output_data *od, const Output_reloc_type& reloc) |
c06b7b0b ILT |
892 | { |
893 | this->relocs_.push_back(reloc); | |
27bc2bce | 894 | this->set_current_data_size(this->relocs_.size() * reloc_size); |
4f4c5f80 | 895 | od->add_dynamic_reloc(); |
c06b7b0b ILT |
896 | } |
897 | ||
898 | private: | |
899 | typedef std::vector<Output_reloc_type> Relocs; | |
900 | ||
901 | Relocs relocs_; | |
902 | }; | |
903 | ||
904 | // The class which callers actually create. | |
905 | ||
906 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
907 | class Output_data_reloc; | |
908 | ||
909 | // The SHT_REL version of Output_data_reloc. | |
910 | ||
911 | template<bool dynamic, int size, bool big_endian> | |
912 | class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> | |
913 | : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian> | |
914 | { | |
915 | private: | |
916 | typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, | |
917 | big_endian> Base; | |
918 | ||
919 | public: | |
920 | typedef typename Base::Output_reloc_type Output_reloc_type; | |
921 | typedef typename Output_reloc_type::Address Address; | |
922 | ||
923 | Output_data_reloc() | |
924 | : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>() | |
925 | { } | |
926 | ||
927 | // Add a reloc against a global symbol. | |
5a6f7e2d | 928 | |
c06b7b0b | 929 | void |
a3ad94ed | 930 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address) |
4f4c5f80 | 931 | { this->add(od, Output_reloc_type(gsym, type, od, address)); } |
c06b7b0b | 932 | |
5a6f7e2d | 933 | void |
4f4c5f80 | 934 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj, |
5a6f7e2d | 935 | unsigned int shndx, Address address) |
4f4c5f80 | 936 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address)); } |
5a6f7e2d | 937 | |
c06b7b0b | 938 | // Add a reloc against a local symbol. |
5a6f7e2d | 939 | |
c06b7b0b | 940 | void |
5a6f7e2d | 941 | add_local(Sized_relobj<size, big_endian>* relobj, |
a3ad94ed ILT |
942 | unsigned int local_sym_index, unsigned int type, |
943 | Output_data* od, Address address) | |
4f4c5f80 ILT |
944 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
945 | address)); } | |
5a6f7e2d ILT |
946 | |
947 | void | |
948 | add_local(Sized_relobj<size, big_endian>* relobj, | |
949 | unsigned int local_sym_index, unsigned int type, | |
4f4c5f80 ILT |
950 | Output_data* od, unsigned int shndx, Address address) |
951 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, | |
952 | address)); } | |
5a6f7e2d | 953 | |
c06b7b0b ILT |
954 | |
955 | // A reloc against the STT_SECTION symbol of an output section. | |
4f4c5f80 ILT |
956 | // OS is the Output_section that the relocation refers to; OD is |
957 | // the Output_data object being relocated. | |
5a6f7e2d | 958 | |
c06b7b0b | 959 | void |
a3ad94ed ILT |
960 | add_output_section(Output_section* os, unsigned int type, |
961 | Output_data* od, Address address) | |
4f4c5f80 | 962 | { this->add(od, Output_reloc_type(os, type, od, address)); } |
5a6f7e2d ILT |
963 | |
964 | void | |
4f4c5f80 | 965 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
5a6f7e2d | 966 | Relobj* relobj, unsigned int shndx, Address address) |
4f4c5f80 | 967 | { this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); } |
c06b7b0b ILT |
968 | }; |
969 | ||
970 | // The SHT_RELA version of Output_data_reloc. | |
971 | ||
972 | template<bool dynamic, int size, bool big_endian> | |
973 | class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
974 | : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
975 | { | |
976 | private: | |
977 | typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, | |
978 | big_endian> Base; | |
979 | ||
980 | public: | |
981 | typedef typename Base::Output_reloc_type Output_reloc_type; | |
982 | typedef typename Output_reloc_type::Address Address; | |
983 | typedef typename Output_reloc_type::Addend Addend; | |
984 | ||
985 | Output_data_reloc() | |
986 | : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>() | |
987 | { } | |
988 | ||
989 | // Add a reloc against a global symbol. | |
5a6f7e2d | 990 | |
c06b7b0b | 991 | void |
a3ad94ed ILT |
992 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
993 | Address address, Addend addend) | |
4f4c5f80 | 994 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend)); } |
c06b7b0b | 995 | |
5a6f7e2d | 996 | void |
4f4c5f80 ILT |
997 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj, |
998 | unsigned int shndx, Address address, | |
999 | Addend addend) | |
1000 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, | |
1001 | addend)); } | |
5a6f7e2d | 1002 | |
c06b7b0b | 1003 | // Add a reloc against a local symbol. |
5a6f7e2d | 1004 | |
c06b7b0b | 1005 | void |
5a6f7e2d | 1006 | add_local(Sized_relobj<size, big_endian>* relobj, |
c06b7b0b | 1007 | unsigned int local_sym_index, unsigned int type, |
a3ad94ed | 1008 | Output_data* od, Address address, Addend addend) |
c06b7b0b | 1009 | { |
4f4c5f80 ILT |
1010 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
1011 | addend)); | |
5a6f7e2d ILT |
1012 | } |
1013 | ||
1014 | void | |
1015 | add_local(Sized_relobj<size, big_endian>* relobj, | |
1016 | unsigned int local_sym_index, unsigned int type, | |
4f4c5f80 ILT |
1017 | Output_data* od, unsigned int shndx, Address address, |
1018 | Addend addend) | |
5a6f7e2d | 1019 | { |
4f4c5f80 ILT |
1020 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
1021 | address, addend)); | |
c06b7b0b ILT |
1022 | } |
1023 | ||
1024 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 1025 | |
c06b7b0b | 1026 | void |
a3ad94ed ILT |
1027 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
1028 | Address address, Addend addend) | |
4f4c5f80 | 1029 | { this->add(os, Output_reloc_type(os, type, od, address, addend)); } |
5a6f7e2d ILT |
1030 | |
1031 | void | |
1032 | add_output_section(Output_section* os, unsigned int type, Relobj* relobj, | |
1033 | unsigned int shndx, Address address, Addend addend) | |
4f4c5f80 ILT |
1034 | { this->add(os, Output_reloc_type(os, type, relobj, shndx, address, |
1035 | addend)); } | |
c06b7b0b ILT |
1036 | }; |
1037 | ||
dbe717ef ILT |
1038 | // Output_data_got is used to manage a GOT. Each entry in the GOT is |
1039 | // for one symbol--either a global symbol or a local symbol in an | |
ead1e424 | 1040 | // object. The target specific code adds entries to the GOT as |
dbe717ef | 1041 | // needed. |
ead1e424 ILT |
1042 | |
1043 | template<int size, bool big_endian> | |
27bc2bce | 1044 | class Output_data_got : public Output_section_data_build |
ead1e424 ILT |
1045 | { |
1046 | public: | |
1047 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; | |
7bf1f802 ILT |
1048 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn; |
1049 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; | |
ead1e424 | 1050 | |
7e1edb90 | 1051 | Output_data_got() |
27bc2bce | 1052 | : Output_section_data_build(Output_data::default_alignment_for_size(size)), |
730cdc88 | 1053 | entries_() |
ead1e424 ILT |
1054 | { } |
1055 | ||
dbe717ef ILT |
1056 | // Add an entry for a global symbol to the GOT. Return true if this |
1057 | // is a new GOT entry, false if the symbol was already in the GOT. | |
1058 | bool | |
1059 | add_global(Symbol* gsym); | |
ead1e424 | 1060 | |
7bf1f802 ILT |
1061 | // Add an entry for a global symbol to the GOT, and add a dynamic |
1062 | // relocation of type R_TYPE for the GOT entry. | |
1063 | void | |
1064 | add_global_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, unsigned int r_type); | |
1065 | ||
1066 | void | |
1067 | add_global_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, unsigned int r_type); | |
1068 | ||
e727fa71 ILT |
1069 | // Add an entry for a local symbol to the GOT. This returns true if |
1070 | // this is a new GOT entry, false if the symbol already has a GOT | |
1071 | // entry. | |
1072 | bool | |
1073 | add_local(Sized_relobj<size, big_endian>* object, unsigned int sym_index); | |
ead1e424 | 1074 | |
7bf1f802 ILT |
1075 | // Add an entry for a global symbol to the GOT, and add a dynamic |
1076 | // relocation of type R_TYPE for the GOT entry. | |
1077 | void | |
1078 | add_local_with_rel(Sized_relobj<size, big_endian>* object, | |
1079 | unsigned int sym_index, Rel_dyn* rel_dyn, | |
1080 | unsigned int r_type); | |
1081 | ||
1082 | void | |
1083 | add_local_with_rela(Sized_relobj<size, big_endian>* object, | |
1084 | unsigned int sym_index, Rela_dyn* rela_dyn, | |
1085 | unsigned int r_type); | |
1086 | ||
07f397ab ILT |
1087 | // Add an entry (or pair of entries) for a global TLS symbol to the GOT. |
1088 | // Return true if this is a new GOT entry, false if the symbol was | |
1089 | // already in the GOT. | |
1090 | bool | |
1091 | add_global_tls(Symbol* gsym, bool need_pair); | |
1092 | ||
7bf1f802 ILT |
1093 | // Add an entry for a global TLS symbol to the GOT, and add a dynamic |
1094 | // relocation of type R_TYPE. | |
1095 | void | |
1096 | add_global_tls_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, | |
1097 | unsigned int r_type); | |
1098 | ||
1099 | void | |
1100 | add_global_tls_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, | |
1101 | unsigned int r_type); | |
1102 | ||
1103 | // Add a pair of entries for a global TLS symbol to the GOT, and add | |
1104 | // dynamic relocations of type MOD_R_TYPE and DTV_R_TYPE, respectively. | |
1105 | void | |
1106 | add_global_tls_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, | |
1107 | unsigned int mod_r_type, | |
1108 | unsigned int dtv_r_type); | |
1109 | ||
1110 | void | |
1111 | add_global_tls_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, | |
1112 | unsigned int mod_r_type, | |
1113 | unsigned int dtv_r_type); | |
1114 | ||
07f397ab ILT |
1115 | // Add an entry (or pair of entries) for a local TLS symbol to the GOT. |
1116 | // This returns true if this is a new GOT entry, false if the symbol | |
1117 | // already has a GOT entry. | |
1118 | bool | |
1119 | add_local_tls(Sized_relobj<size, big_endian>* object, | |
1120 | unsigned int sym_index, bool need_pair); | |
1121 | ||
7bf1f802 ILT |
1122 | // Add an entry (or pair of entries) for a local TLS symbol to the GOT, |
1123 | // and add a dynamic relocation of type R_TYPE for the first GOT entry. | |
1124 | // Because this is a local symbol, the first GOT entry can be relocated | |
1125 | // relative to a section symbol, and the second GOT entry will have an | |
1126 | // dtv-relative value that can be computed at link time. | |
1127 | void | |
1128 | add_local_tls_with_rel(Sized_relobj<size, big_endian>* object, | |
1129 | unsigned int sym_index, unsigned int shndx, | |
1130 | bool need_pair, Rel_dyn* rel_dyn, | |
1131 | unsigned int r_type); | |
1132 | ||
1133 | void | |
1134 | add_local_tls_with_rela(Sized_relobj<size, big_endian>* object, | |
1135 | unsigned int sym_index, unsigned int shndx, | |
1136 | bool need_pair, Rela_dyn* rela_dyn, | |
1137 | unsigned int r_type); | |
1138 | ||
ead1e424 ILT |
1139 | // Add a constant to the GOT. This returns the offset of the new |
1140 | // entry from the start of the GOT. | |
1141 | unsigned int | |
1142 | add_constant(Valtype constant) | |
1143 | { | |
1144 | this->entries_.push_back(Got_entry(constant)); | |
1145 | this->set_got_size(); | |
1146 | return this->last_got_offset(); | |
1147 | } | |
1148 | ||
27bc2bce | 1149 | protected: |
ead1e424 ILT |
1150 | // Write out the GOT table. |
1151 | void | |
1152 | do_write(Output_file*); | |
1153 | ||
1154 | private: | |
1155 | // This POD class holds a single GOT entry. | |
1156 | class Got_entry | |
1157 | { | |
1158 | public: | |
1159 | // Create a zero entry. | |
1160 | Got_entry() | |
1161 | : local_sym_index_(CONSTANT_CODE) | |
1162 | { this->u_.constant = 0; } | |
1163 | ||
1164 | // Create a global symbol entry. | |
a3ad94ed | 1165 | explicit Got_entry(Symbol* gsym) |
ead1e424 ILT |
1166 | : local_sym_index_(GSYM_CODE) |
1167 | { this->u_.gsym = gsym; } | |
1168 | ||
1169 | // Create a local symbol entry. | |
e727fa71 ILT |
1170 | Got_entry(Sized_relobj<size, big_endian>* object, |
1171 | unsigned int local_sym_index) | |
ead1e424 ILT |
1172 | : local_sym_index_(local_sym_index) |
1173 | { | |
a3ad94ed ILT |
1174 | gold_assert(local_sym_index != GSYM_CODE |
1175 | && local_sym_index != CONSTANT_CODE); | |
ead1e424 ILT |
1176 | this->u_.object = object; |
1177 | } | |
1178 | ||
1179 | // Create a constant entry. The constant is a host value--it will | |
1180 | // be swapped, if necessary, when it is written out. | |
a3ad94ed | 1181 | explicit Got_entry(Valtype constant) |
ead1e424 ILT |
1182 | : local_sym_index_(CONSTANT_CODE) |
1183 | { this->u_.constant = constant; } | |
1184 | ||
1185 | // Write the GOT entry to an output view. | |
1186 | void | |
7e1edb90 | 1187 | write(unsigned char* pov) const; |
ead1e424 ILT |
1188 | |
1189 | private: | |
1190 | enum | |
1191 | { | |
1192 | GSYM_CODE = -1U, | |
1193 | CONSTANT_CODE = -2U | |
1194 | }; | |
1195 | ||
1196 | union | |
1197 | { | |
1198 | // For a local symbol, the object. | |
e727fa71 | 1199 | Sized_relobj<size, big_endian>* object; |
ead1e424 ILT |
1200 | // For a global symbol, the symbol. |
1201 | Symbol* gsym; | |
1202 | // For a constant, the constant. | |
1203 | Valtype constant; | |
1204 | } u_; | |
c06b7b0b ILT |
1205 | // For a local symbol, the local symbol index. This is GSYM_CODE |
1206 | // for a global symbol, or CONSTANT_CODE for a constant. | |
ead1e424 ILT |
1207 | unsigned int local_sym_index_; |
1208 | }; | |
1209 | ||
1210 | typedef std::vector<Got_entry> Got_entries; | |
1211 | ||
1212 | // Return the offset into the GOT of GOT entry I. | |
1213 | unsigned int | |
1214 | got_offset(unsigned int i) const | |
1215 | { return i * (size / 8); } | |
1216 | ||
1217 | // Return the offset into the GOT of the last entry added. | |
1218 | unsigned int | |
1219 | last_got_offset() const | |
1220 | { return this->got_offset(this->entries_.size() - 1); } | |
1221 | ||
1222 | // Set the size of the section. | |
1223 | void | |
1224 | set_got_size() | |
27bc2bce | 1225 | { this->set_current_data_size(this->got_offset(this->entries_.size())); } |
ead1e424 ILT |
1226 | |
1227 | // The list of GOT entries. | |
1228 | Got_entries entries_; | |
1229 | }; | |
1230 | ||
a3ad94ed ILT |
1231 | // Output_data_dynamic is used to hold the data in SHT_DYNAMIC |
1232 | // section. | |
1233 | ||
1234 | class Output_data_dynamic : public Output_section_data | |
1235 | { | |
1236 | public: | |
9025d29d | 1237 | Output_data_dynamic(Stringpool* pool) |
730cdc88 | 1238 | : Output_section_data(Output_data::default_alignment()), |
9025d29d | 1239 | entries_(), pool_(pool) |
a3ad94ed ILT |
1240 | { } |
1241 | ||
1242 | // Add a new dynamic entry with a fixed numeric value. | |
1243 | void | |
1244 | add_constant(elfcpp::DT tag, unsigned int val) | |
1245 | { this->add_entry(Dynamic_entry(tag, val)); } | |
1246 | ||
16649710 | 1247 | // Add a new dynamic entry with the address of output data. |
a3ad94ed | 1248 | void |
16649710 ILT |
1249 | add_section_address(elfcpp::DT tag, const Output_data* od) |
1250 | { this->add_entry(Dynamic_entry(tag, od, false)); } | |
a3ad94ed | 1251 | |
16649710 | 1252 | // Add a new dynamic entry with the size of output data. |
a3ad94ed | 1253 | void |
16649710 ILT |
1254 | add_section_size(elfcpp::DT tag, const Output_data* od) |
1255 | { this->add_entry(Dynamic_entry(tag, od, true)); } | |
a3ad94ed ILT |
1256 | |
1257 | // Add a new dynamic entry with the address of a symbol. | |
1258 | void | |
16649710 | 1259 | add_symbol(elfcpp::DT tag, const Symbol* sym) |
a3ad94ed ILT |
1260 | { this->add_entry(Dynamic_entry(tag, sym)); } |
1261 | ||
1262 | // Add a new dynamic entry with a string. | |
1263 | void | |
1264 | add_string(elfcpp::DT tag, const char* str) | |
cfd73a4e | 1265 | { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); } |
a3ad94ed | 1266 | |
41f542e7 ILT |
1267 | void |
1268 | add_string(elfcpp::DT tag, const std::string& str) | |
1269 | { this->add_string(tag, str.c_str()); } | |
1270 | ||
27bc2bce ILT |
1271 | protected: |
1272 | // Adjust the output section to set the entry size. | |
1273 | void | |
1274 | do_adjust_output_section(Output_section*); | |
1275 | ||
a3ad94ed ILT |
1276 | // Set the final data size. |
1277 | void | |
27bc2bce | 1278 | set_final_data_size(); |
a3ad94ed ILT |
1279 | |
1280 | // Write out the dynamic entries. | |
1281 | void | |
1282 | do_write(Output_file*); | |
1283 | ||
1284 | private: | |
1285 | // This POD class holds a single dynamic entry. | |
1286 | class Dynamic_entry | |
1287 | { | |
1288 | public: | |
1289 | // Create an entry with a fixed numeric value. | |
1290 | Dynamic_entry(elfcpp::DT tag, unsigned int val) | |
1291 | : tag_(tag), classification_(DYNAMIC_NUMBER) | |
1292 | { this->u_.val = val; } | |
1293 | ||
1294 | // Create an entry with the size or address of a section. | |
16649710 | 1295 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size) |
a3ad94ed ILT |
1296 | : tag_(tag), |
1297 | classification_(section_size | |
1298 | ? DYNAMIC_SECTION_SIZE | |
1299 | : DYNAMIC_SECTION_ADDRESS) | |
16649710 | 1300 | { this->u_.od = od; } |
a3ad94ed ILT |
1301 | |
1302 | // Create an entry with the address of a symbol. | |
16649710 | 1303 | Dynamic_entry(elfcpp::DT tag, const Symbol* sym) |
a3ad94ed ILT |
1304 | : tag_(tag), classification_(DYNAMIC_SYMBOL) |
1305 | { this->u_.sym = sym; } | |
1306 | ||
1307 | // Create an entry with a string. | |
1308 | Dynamic_entry(elfcpp::DT tag, const char* str) | |
1309 | : tag_(tag), classification_(DYNAMIC_STRING) | |
1310 | { this->u_.str = str; } | |
1311 | ||
1312 | // Write the dynamic entry to an output view. | |
1313 | template<int size, bool big_endian> | |
1314 | void | |
1ddbd1e6 | 1315 | write(unsigned char* pov, const Stringpool* ACCEPT_SIZE_ENDIAN) const; |
a3ad94ed ILT |
1316 | |
1317 | private: | |
1318 | enum Classification | |
1319 | { | |
1320 | // Number. | |
1321 | DYNAMIC_NUMBER, | |
1322 | // Section address. | |
1323 | DYNAMIC_SECTION_ADDRESS, | |
1324 | // Section size. | |
1325 | DYNAMIC_SECTION_SIZE, | |
1326 | // Symbol adress. | |
1327 | DYNAMIC_SYMBOL, | |
1328 | // String. | |
1329 | DYNAMIC_STRING | |
1330 | }; | |
1331 | ||
1332 | union | |
1333 | { | |
1334 | // For DYNAMIC_NUMBER. | |
1335 | unsigned int val; | |
1336 | // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE. | |
16649710 | 1337 | const Output_data* od; |
a3ad94ed | 1338 | // For DYNAMIC_SYMBOL. |
16649710 | 1339 | const Symbol* sym; |
a3ad94ed ILT |
1340 | // For DYNAMIC_STRING. |
1341 | const char* str; | |
1342 | } u_; | |
1343 | // The dynamic tag. | |
1344 | elfcpp::DT tag_; | |
1345 | // The type of entry. | |
1346 | Classification classification_; | |
1347 | }; | |
1348 | ||
1349 | // Add an entry to the list. | |
1350 | void | |
1351 | add_entry(const Dynamic_entry& entry) | |
1352 | { this->entries_.push_back(entry); } | |
1353 | ||
1354 | // Sized version of write function. | |
1355 | template<int size, bool big_endian> | |
1356 | void | |
1357 | sized_write(Output_file* of); | |
1358 | ||
1359 | // The type of the list of entries. | |
1360 | typedef std::vector<Dynamic_entry> Dynamic_entries; | |
1361 | ||
a3ad94ed ILT |
1362 | // The entries. |
1363 | Dynamic_entries entries_; | |
1364 | // The pool used for strings. | |
1365 | Stringpool* pool_; | |
1366 | }; | |
1367 | ||
a2fb1b05 ILT |
1368 | // An output section. We don't expect to have too many output |
1369 | // sections, so we don't bother to do a template on the size. | |
1370 | ||
54dc6425 | 1371 | class Output_section : public Output_data |
a2fb1b05 ILT |
1372 | { |
1373 | public: | |
1374 | // Create an output section, giving the name, type, and flags. | |
96803768 | 1375 | Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword); |
54dc6425 | 1376 | virtual ~Output_section(); |
a2fb1b05 | 1377 | |
ead1e424 | 1378 | // Add a new input section SHNDX, named NAME, with header SHDR, from |
730cdc88 ILT |
1379 | // object OBJECT. RELOC_SHNDX is the index of a relocation section |
1380 | // which applies to this section, or 0 if none, or -1U if more than | |
1381 | // one. Return the offset within the output section. | |
a2fb1b05 ILT |
1382 | template<int size, bool big_endian> |
1383 | off_t | |
730cdc88 ILT |
1384 | add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
1385 | const char *name, | |
1386 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1387 | unsigned int reloc_shndx); | |
a2fb1b05 | 1388 | |
b8e6aad9 | 1389 | // Add generated data POSD to this output section. |
c06b7b0b | 1390 | void |
ead1e424 ILT |
1391 | add_output_section_data(Output_section_data* posd); |
1392 | ||
a2fb1b05 ILT |
1393 | // Return the section name. |
1394 | const char* | |
1395 | name() const | |
1396 | { return this->name_; } | |
1397 | ||
1398 | // Return the section type. | |
1399 | elfcpp::Elf_Word | |
1400 | type() const | |
1401 | { return this->type_; } | |
1402 | ||
1403 | // Return the section flags. | |
1404 | elfcpp::Elf_Xword | |
1405 | flags() const | |
1406 | { return this->flags_; } | |
1407 | ||
a3ad94ed ILT |
1408 | // Return the entsize field. |
1409 | uint64_t | |
1410 | entsize() const | |
1411 | { return this->entsize_; } | |
1412 | ||
61ba1cf9 ILT |
1413 | // Set the entsize field. |
1414 | void | |
16649710 | 1415 | set_entsize(uint64_t v); |
61ba1cf9 | 1416 | |
16649710 ILT |
1417 | // Set the link field to the output section index of a section. |
1418 | void | |
14b31740 | 1419 | set_link_section(const Output_data* od) |
16649710 ILT |
1420 | { |
1421 | gold_assert(this->link_ == 0 | |
1422 | && !this->should_link_to_symtab_ | |
1423 | && !this->should_link_to_dynsym_); | |
1424 | this->link_section_ = od; | |
1425 | } | |
1426 | ||
1427 | // Set the link field to a constant. | |
61ba1cf9 ILT |
1428 | void |
1429 | set_link(unsigned int v) | |
16649710 ILT |
1430 | { |
1431 | gold_assert(this->link_section_ == NULL | |
1432 | && !this->should_link_to_symtab_ | |
1433 | && !this->should_link_to_dynsym_); | |
1434 | this->link_ = v; | |
1435 | } | |
61ba1cf9 | 1436 | |
16649710 ILT |
1437 | // Record that this section should link to the normal symbol table. |
1438 | void | |
1439 | set_should_link_to_symtab() | |
1440 | { | |
1441 | gold_assert(this->link_section_ == NULL | |
1442 | && this->link_ == 0 | |
1443 | && !this->should_link_to_dynsym_); | |
1444 | this->should_link_to_symtab_ = true; | |
1445 | } | |
1446 | ||
1447 | // Record that this section should link to the dynamic symbol table. | |
1448 | void | |
1449 | set_should_link_to_dynsym() | |
1450 | { | |
1451 | gold_assert(this->link_section_ == NULL | |
1452 | && this->link_ == 0 | |
1453 | && !this->should_link_to_symtab_); | |
1454 | this->should_link_to_dynsym_ = true; | |
1455 | } | |
1456 | ||
1457 | // Return the info field. | |
1458 | unsigned int | |
1459 | info() const | |
1460 | { | |
1461 | gold_assert(this->info_section_ == NULL); | |
1462 | return this->info_; | |
1463 | } | |
1464 | ||
1465 | // Set the info field to the output section index of a section. | |
1466 | void | |
14b31740 | 1467 | set_info_section(const Output_data* od) |
16649710 ILT |
1468 | { |
1469 | gold_assert(this->info_ == 0); | |
1470 | this->info_section_ = od; | |
1471 | } | |
1472 | ||
1473 | // Set the info field to a constant. | |
61ba1cf9 ILT |
1474 | void |
1475 | set_info(unsigned int v) | |
16649710 ILT |
1476 | { |
1477 | gold_assert(this->info_section_ == NULL); | |
1478 | this->info_ = v; | |
1479 | } | |
61ba1cf9 ILT |
1480 | |
1481 | // Set the addralign field. | |
1482 | void | |
1483 | set_addralign(uint64_t v) | |
1484 | { this->addralign_ = v; } | |
1485 | ||
c06b7b0b ILT |
1486 | // Indicate that we need a symtab index. |
1487 | void | |
1488 | set_needs_symtab_index() | |
1489 | { this->needs_symtab_index_ = true; } | |
1490 | ||
1491 | // Return whether we need a symtab index. | |
1492 | bool | |
1493 | needs_symtab_index() const | |
1494 | { return this->needs_symtab_index_; } | |
1495 | ||
1496 | // Get the symtab index. | |
1497 | unsigned int | |
1498 | symtab_index() const | |
1499 | { | |
a3ad94ed | 1500 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
1501 | return this->symtab_index_; |
1502 | } | |
1503 | ||
1504 | // Set the symtab index. | |
1505 | void | |
1506 | set_symtab_index(unsigned int index) | |
1507 | { | |
a3ad94ed | 1508 | gold_assert(index != 0); |
c06b7b0b ILT |
1509 | this->symtab_index_ = index; |
1510 | } | |
1511 | ||
1512 | // Indicate that we need a dynsym index. | |
1513 | void | |
1514 | set_needs_dynsym_index() | |
1515 | { this->needs_dynsym_index_ = true; } | |
1516 | ||
1517 | // Return whether we need a dynsym index. | |
1518 | bool | |
1519 | needs_dynsym_index() const | |
1520 | { return this->needs_dynsym_index_; } | |
1521 | ||
1522 | // Get the dynsym index. | |
1523 | unsigned int | |
1524 | dynsym_index() const | |
1525 | { | |
a3ad94ed | 1526 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
1527 | return this->dynsym_index_; |
1528 | } | |
1529 | ||
1530 | // Set the dynsym index. | |
1531 | void | |
1532 | set_dynsym_index(unsigned int index) | |
1533 | { | |
a3ad94ed | 1534 | gold_assert(index != 0); |
c06b7b0b ILT |
1535 | this->dynsym_index_ = index; |
1536 | } | |
1537 | ||
730cdc88 ILT |
1538 | // Return whether this section should be written after all the input |
1539 | // sections are complete. | |
1540 | bool | |
1541 | after_input_sections() const | |
1542 | { return this->after_input_sections_; } | |
1543 | ||
1544 | // Record that this section should be written after all the input | |
1545 | // sections are complete. | |
1546 | void | |
1547 | set_after_input_sections() | |
1548 | { this->after_input_sections_ = true; } | |
1549 | ||
27bc2bce ILT |
1550 | // Return whether this section requires postprocessing after all |
1551 | // relocations have been applied. | |
1552 | bool | |
1553 | requires_postprocessing() const | |
1554 | { return this->requires_postprocessing_; } | |
1555 | ||
96803768 ILT |
1556 | // If a section requires postprocessing, return the buffer to use. |
1557 | unsigned char* | |
1558 | postprocessing_buffer() const | |
1559 | { | |
1560 | gold_assert(this->postprocessing_buffer_ != NULL); | |
1561 | return this->postprocessing_buffer_; | |
1562 | } | |
1563 | ||
1564 | // If a section requires postprocessing, create the buffer to use. | |
27bc2bce | 1565 | void |
96803768 ILT |
1566 | create_postprocessing_buffer(); |
1567 | ||
1568 | // If a section requires postprocessing, this is the size of the | |
1569 | // buffer to which relocations should be applied. | |
1570 | off_t | |
1571 | postprocessing_buffer_size() const | |
1572 | { return this->current_data_size_for_child(); } | |
27bc2bce | 1573 | |
730cdc88 ILT |
1574 | // Return whether the offset OFFSET in the input section SHNDX in |
1575 | // object OBJECT is being included in the link. | |
1576 | bool | |
1577 | is_input_address_mapped(const Relobj* object, unsigned int shndx, | |
1578 | off_t offset) const; | |
1579 | ||
1580 | // Return the offset within the output section of OFFSET relative to | |
1581 | // the start of input section SHNDX in object OBJECT. | |
1582 | off_t | |
1583 | output_offset(const Relobj* object, unsigned int shndx, off_t offset) const; | |
1584 | ||
b8e6aad9 ILT |
1585 | // Return the output virtual address of OFFSET relative to the start |
1586 | // of input section SHNDX in object OBJECT. | |
1587 | uint64_t | |
1588 | output_address(const Relobj* object, unsigned int shndx, | |
1589 | off_t offset) const; | |
1590 | ||
27bc2bce ILT |
1591 | // Write the section header into *OPHDR. |
1592 | template<int size, bool big_endian> | |
1593 | void | |
1594 | write_header(const Layout*, const Stringpool*, | |
1595 | elfcpp::Shdr_write<size, big_endian>*) const; | |
1596 | ||
1597 | protected: | |
1598 | // Return the section index in the output file. | |
1599 | unsigned int | |
1600 | do_out_shndx() const | |
1601 | { | |
1602 | gold_assert(this->out_shndx_ != -1U); | |
1603 | return this->out_shndx_; | |
1604 | } | |
1605 | ||
1606 | // Set the output section index. | |
1607 | void | |
1608 | do_set_out_shndx(unsigned int shndx) | |
1609 | { | |
1610 | gold_assert(this->out_shndx_ == -1U); | |
1611 | this->out_shndx_ = shndx; | |
1612 | } | |
1613 | ||
1614 | // Set the final data size of the Output_section. For a typical | |
ead1e424 | 1615 | // Output_section, there is nothing to do, but if there are any |
27bc2bce | 1616 | // Output_section_data objects we need to set their final addresses |
ead1e424 | 1617 | // here. |
96803768 | 1618 | virtual void |
27bc2bce | 1619 | set_final_data_size(); |
ead1e424 | 1620 | |
54dc6425 | 1621 | // Write the data to the file. For a typical Output_section, this |
ead1e424 ILT |
1622 | // does nothing: the data is written out by calling Object::Relocate |
1623 | // on each input object. But if there are any Output_section_data | |
1624 | // objects we do need to write them out here. | |
96803768 | 1625 | virtual void |
ead1e424 | 1626 | do_write(Output_file*); |
54dc6425 | 1627 | |
75f65a3e ILT |
1628 | // Return the address alignment--function required by parent class. |
1629 | uint64_t | |
1630 | do_addralign() const | |
1631 | { return this->addralign_; } | |
1632 | ||
1633 | // Return whether this is an Output_section. | |
1634 | bool | |
1635 | do_is_section() const | |
1636 | { return true; } | |
1637 | ||
54dc6425 ILT |
1638 | // Return whether this is a section of the specified type. |
1639 | bool | |
75f65a3e | 1640 | do_is_section_type(elfcpp::Elf_Word type) const |
54dc6425 ILT |
1641 | { return this->type_ == type; } |
1642 | ||
1643 | // Return whether the specified section flag is set. | |
1644 | bool | |
75f65a3e | 1645 | do_is_section_flag_set(elfcpp::Elf_Xword flag) const |
54dc6425 ILT |
1646 | { return (this->flags_ & flag) != 0; } |
1647 | ||
7bf1f802 ILT |
1648 | // Set the TLS offset. Called only for SHT_TLS sections. |
1649 | void | |
1650 | do_set_tls_offset(uint64_t tls_base); | |
1651 | ||
1652 | // Return the TLS offset, relative to the base of the TLS segment. | |
1653 | // Valid only for SHT_TLS sections. | |
1654 | uint64_t | |
1655 | do_tls_offset() const | |
1656 | { return this->tls_offset_; } | |
1657 | ||
96803768 ILT |
1658 | // Modify the section name. This is only permitted for an |
1659 | // unallocated section, and only before the size has been finalized. | |
1660 | // Otherwise the name will not get into Layout::namepool_. | |
1661 | void | |
1662 | set_name(const char* newname) | |
1663 | { | |
1664 | gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0); | |
1665 | gold_assert(!this->is_data_size_valid()); | |
1666 | this->name_ = newname; | |
1667 | } | |
1668 | ||
1669 | // This may be implemented by a child class. | |
1670 | virtual void | |
1671 | do_finalize_name(Layout*) | |
1672 | { } | |
1673 | ||
1674 | // Record that this section requires postprocessing after all | |
1675 | // relocations have been applied. This is called by a child class. | |
1676 | void | |
1677 | set_requires_postprocessing() | |
1678 | { | |
1679 | this->requires_postprocessing_ = true; | |
1680 | this->after_input_sections_ = true; | |
1681 | } | |
1682 | ||
1683 | // Write all the data of an Output_section into the postprocessing | |
1684 | // buffer. | |
1685 | void | |
1686 | write_to_postprocessing_buffer(); | |
1687 | ||
a2fb1b05 | 1688 | private: |
ead1e424 ILT |
1689 | // In some cases we need to keep a list of the input sections |
1690 | // associated with this output section. We only need the list if we | |
1691 | // might have to change the offsets of the input section within the | |
1692 | // output section after we add the input section. The ordinary | |
1693 | // input sections will be written out when we process the object | |
1694 | // file, and as such we don't need to track them here. We do need | |
1695 | // to track Output_section_data objects here. We store instances of | |
1696 | // this structure in a std::vector, so it must be a POD. There can | |
1697 | // be many instances of this structure, so we use a union to save | |
1698 | // some space. | |
1699 | class Input_section | |
1700 | { | |
1701 | public: | |
1702 | Input_section() | |
b8e6aad9 ILT |
1703 | : shndx_(0), p2align_(0) |
1704 | { | |
1705 | this->u1_.data_size = 0; | |
1706 | this->u2_.object = NULL; | |
1707 | } | |
ead1e424 | 1708 | |
b8e6aad9 | 1709 | // For an ordinary input section. |
f6ce93d6 | 1710 | Input_section(Relobj* object, unsigned int shndx, off_t data_size, |
ead1e424 ILT |
1711 | uint64_t addralign) |
1712 | : shndx_(shndx), | |
b8e6aad9 | 1713 | p2align_(ffsll(static_cast<long long>(addralign))) |
ead1e424 | 1714 | { |
b8e6aad9 ILT |
1715 | gold_assert(shndx != OUTPUT_SECTION_CODE |
1716 | && shndx != MERGE_DATA_SECTION_CODE | |
1717 | && shndx != MERGE_STRING_SECTION_CODE); | |
1718 | this->u1_.data_size = data_size; | |
1719 | this->u2_.object = object; | |
ead1e424 ILT |
1720 | } |
1721 | ||
b8e6aad9 | 1722 | // For a non-merge output section. |
ead1e424 | 1723 | Input_section(Output_section_data* posd) |
b8e6aad9 ILT |
1724 | : shndx_(OUTPUT_SECTION_CODE), |
1725 | p2align_(ffsll(static_cast<long long>(posd->addralign()))) | |
1726 | { | |
1727 | this->u1_.data_size = 0; | |
1728 | this->u2_.posd = posd; | |
1729 | } | |
1730 | ||
1731 | // For a merge section. | |
1732 | Input_section(Output_section_data* posd, bool is_string, uint64_t entsize) | |
1733 | : shndx_(is_string | |
1734 | ? MERGE_STRING_SECTION_CODE | |
1735 | : MERGE_DATA_SECTION_CODE), | |
1736 | p2align_(ffsll(static_cast<long long>(posd->addralign()))) | |
1737 | { | |
1738 | this->u1_.entsize = entsize; | |
1739 | this->u2_.posd = posd; | |
1740 | } | |
ead1e424 ILT |
1741 | |
1742 | // The required alignment. | |
1743 | uint64_t | |
1744 | addralign() const | |
a3ad94ed ILT |
1745 | { |
1746 | return (this->p2align_ == 0 | |
1747 | ? 0 | |
1748 | : static_cast<uint64_t>(1) << (this->p2align_ - 1)); | |
1749 | } | |
ead1e424 ILT |
1750 | |
1751 | // Return the required size. | |
1752 | off_t | |
1753 | data_size() const; | |
1754 | ||
b8e6aad9 ILT |
1755 | // Return whether this is a merge section which matches the |
1756 | // parameters. | |
1757 | bool | |
87f95776 ILT |
1758 | is_merge_section(bool is_string, uint64_t entsize, |
1759 | uint64_t addralign) const | |
b8e6aad9 ILT |
1760 | { |
1761 | return (this->shndx_ == (is_string | |
1762 | ? MERGE_STRING_SECTION_CODE | |
1763 | : MERGE_DATA_SECTION_CODE) | |
87f95776 ILT |
1764 | && this->u1_.entsize == entsize |
1765 | && this->addralign() == addralign); | |
b8e6aad9 ILT |
1766 | } |
1767 | ||
1768 | // Set the output section. | |
1769 | void | |
1770 | set_output_section(Output_section* os) | |
1771 | { | |
1772 | gold_assert(!this->is_input_section()); | |
1773 | this->u2_.posd->set_output_section(os); | |
1774 | } | |
1775 | ||
ead1e424 | 1776 | // Set the address and file offset. This is called during |
96803768 ILT |
1777 | // Layout::finalize. SECTION_FILE_OFFSET is the file offset of |
1778 | // the enclosing section. | |
ead1e424 | 1779 | void |
96803768 ILT |
1780 | set_address_and_file_offset(uint64_t address, off_t file_offset, |
1781 | off_t section_file_offset); | |
ead1e424 | 1782 | |
96803768 ILT |
1783 | // Finalize the data size. |
1784 | void | |
1785 | finalize_data_size(); | |
9a0910c3 | 1786 | |
b8e6aad9 ILT |
1787 | // Add an input section, for SHF_MERGE sections. |
1788 | bool | |
1789 | add_input_section(Relobj* object, unsigned int shndx) | |
1790 | { | |
1791 | gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE | |
1792 | || this->shndx_ == MERGE_STRING_SECTION_CODE); | |
1793 | return this->u2_.posd->add_input_section(object, shndx); | |
1794 | } | |
1795 | ||
1796 | // Given an input OBJECT, an input section index SHNDX within that | |
1797 | // object, and an OFFSET relative to the start of that input | |
730cdc88 ILT |
1798 | // section, return whether or not the output offset is known. If |
1799 | // this function returns true, it sets *POUTPUT to the output | |
1800 | // offset. | |
b8e6aad9 | 1801 | bool |
730cdc88 ILT |
1802 | output_offset(const Relobj* object, unsigned int shndx, off_t offset, |
1803 | off_t *poutput) const; | |
b8e6aad9 | 1804 | |
ead1e424 ILT |
1805 | // Write out the data. This does nothing for an input section. |
1806 | void | |
1807 | write(Output_file*); | |
1808 | ||
96803768 ILT |
1809 | // Write the data to a buffer. This does nothing for an input |
1810 | // section. | |
1811 | void | |
1812 | write_to_buffer(unsigned char*); | |
1813 | ||
ead1e424 | 1814 | private: |
b8e6aad9 ILT |
1815 | // Code values which appear in shndx_. If the value is not one of |
1816 | // these codes, it is the input section index in the object file. | |
1817 | enum | |
1818 | { | |
1819 | // An Output_section_data. | |
1820 | OUTPUT_SECTION_CODE = -1U, | |
1821 | // An Output_section_data for an SHF_MERGE section with | |
1822 | // SHF_STRINGS not set. | |
1823 | MERGE_DATA_SECTION_CODE = -2U, | |
1824 | // An Output_section_data for an SHF_MERGE section with | |
1825 | // SHF_STRINGS set. | |
1826 | MERGE_STRING_SECTION_CODE = -3U | |
1827 | }; | |
1828 | ||
ead1e424 ILT |
1829 | // Whether this is an input section. |
1830 | bool | |
1831 | is_input_section() const | |
b8e6aad9 ILT |
1832 | { |
1833 | return (this->shndx_ != OUTPUT_SECTION_CODE | |
1834 | && this->shndx_ != MERGE_DATA_SECTION_CODE | |
1835 | && this->shndx_ != MERGE_STRING_SECTION_CODE); | |
1836 | } | |
ead1e424 | 1837 | |
b8e6aad9 ILT |
1838 | // For an ordinary input section, this is the section index in the |
1839 | // input file. For an Output_section_data, this is | |
1840 | // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or | |
1841 | // MERGE_STRING_SECTION_CODE. | |
ead1e424 ILT |
1842 | unsigned int shndx_; |
1843 | // The required alignment, stored as a power of 2. | |
1844 | unsigned int p2align_; | |
ead1e424 ILT |
1845 | union |
1846 | { | |
b8e6aad9 ILT |
1847 | // For an ordinary input section, the section size. |
1848 | off_t data_size; | |
1849 | // For OUTPUT_SECTION_CODE, this is not used. For | |
1850 | // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the | |
1851 | // entity size. | |
1852 | uint64_t entsize; | |
1853 | } u1_; | |
1854 | union | |
1855 | { | |
1856 | // For an ordinary input section, the object which holds the | |
ead1e424 | 1857 | // input section. |
f6ce93d6 | 1858 | Relobj* object; |
b8e6aad9 ILT |
1859 | // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or |
1860 | // MERGE_STRING_SECTION_CODE, the data. | |
ead1e424 | 1861 | Output_section_data* posd; |
b8e6aad9 | 1862 | } u2_; |
ead1e424 ILT |
1863 | }; |
1864 | ||
1865 | typedef std::vector<Input_section> Input_section_list; | |
1866 | ||
c51e6221 ILT |
1867 | // Fill data. This is used to fill in data between input sections. |
1868 | // When we have to keep track of the input sections, we can use an | |
1869 | // Output_data_const, but we don't want to have to keep track of | |
1870 | // input sections just to implement fills. For a fill we record the | |
1871 | // offset, and the actual data to be written out. | |
1872 | class Fill | |
1873 | { | |
1874 | public: | |
1875 | Fill(off_t section_offset, off_t length) | |
1876 | : section_offset_(section_offset), length_(length) | |
1877 | { } | |
1878 | ||
1879 | // Return section offset. | |
1880 | off_t | |
1881 | section_offset() const | |
1882 | { return this->section_offset_; } | |
1883 | ||
1884 | // Return fill length. | |
1885 | off_t | |
1886 | length() const | |
1887 | { return this->length_; } | |
1888 | ||
1889 | private: | |
1890 | // The offset within the output section. | |
1891 | off_t section_offset_; | |
1892 | // The length of the space to fill. | |
1893 | off_t length_; | |
1894 | }; | |
1895 | ||
1896 | typedef std::vector<Fill> Fill_list; | |
1897 | ||
b8e6aad9 ILT |
1898 | // Add a new output section by Input_section. |
1899 | void | |
1900 | add_output_section_data(Input_section*); | |
1901 | ||
1902 | // Add an SHF_MERGE input section. Returns true if the section was | |
1903 | // handled. | |
1904 | bool | |
1905 | add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags, | |
96803768 | 1906 | uint64_t entsize, uint64_t addralign); |
b8e6aad9 ILT |
1907 | |
1908 | // Add an output SHF_MERGE section POSD to this output section. | |
1909 | // IS_STRING indicates whether it is a SHF_STRINGS section, and | |
1910 | // ENTSIZE is the entity size. This returns the entry added to | |
1911 | // input_sections_. | |
1912 | void | |
1913 | add_output_merge_section(Output_section_data* posd, bool is_string, | |
1914 | uint64_t entsize); | |
1915 | ||
a2fb1b05 ILT |
1916 | // Most of these fields are only valid after layout. |
1917 | ||
1918 | // The name of the section. This will point into a Stringpool. | |
9a0910c3 | 1919 | const char* name_; |
75f65a3e | 1920 | // The section address is in the parent class. |
a2fb1b05 ILT |
1921 | // The section alignment. |
1922 | uint64_t addralign_; | |
1923 | // The section entry size. | |
1924 | uint64_t entsize_; | |
75f65a3e | 1925 | // The file offset is in the parent class. |
16649710 | 1926 | // Set the section link field to the index of this section. |
14b31740 | 1927 | const Output_data* link_section_; |
16649710 | 1928 | // If link_section_ is NULL, this is the link field. |
a2fb1b05 | 1929 | unsigned int link_; |
16649710 | 1930 | // Set the section info field to the index of this section. |
14b31740 | 1931 | const Output_data* info_section_; |
16649710 | 1932 | // If info_section_ is NULL, this is the section info field. |
a2fb1b05 ILT |
1933 | unsigned int info_; |
1934 | // The section type. | |
27bc2bce | 1935 | const elfcpp::Elf_Word type_; |
a2fb1b05 | 1936 | // The section flags. |
27bc2bce | 1937 | const elfcpp::Elf_Xword flags_; |
61ba1cf9 | 1938 | // The section index. |
ead1e424 | 1939 | unsigned int out_shndx_; |
c06b7b0b ILT |
1940 | // If there is a STT_SECTION for this output section in the normal |
1941 | // symbol table, this is the symbol index. This starts out as zero. | |
1942 | // It is initialized in Layout::finalize() to be the index, or -1U | |
1943 | // if there isn't one. | |
1944 | unsigned int symtab_index_; | |
1945 | // If there is a STT_SECTION for this output section in the dynamic | |
1946 | // symbol table, this is the symbol index. This starts out as zero. | |
1947 | // It is initialized in Layout::finalize() to be the index, or -1U | |
1948 | // if there isn't one. | |
1949 | unsigned int dynsym_index_; | |
ead1e424 ILT |
1950 | // The input sections. This will be empty in cases where we don't |
1951 | // need to keep track of them. | |
1952 | Input_section_list input_sections_; | |
1953 | // The offset of the first entry in input_sections_. | |
1954 | off_t first_input_offset_; | |
c51e6221 ILT |
1955 | // The fill data. This is separate from input_sections_ because we |
1956 | // often will need fill sections without needing to keep track of | |
1957 | // input sections. | |
1958 | Fill_list fills_; | |
96803768 ILT |
1959 | // If the section requires postprocessing, this buffer holds the |
1960 | // section contents during relocation. | |
1961 | unsigned char* postprocessing_buffer_; | |
c06b7b0b ILT |
1962 | // Whether this output section needs a STT_SECTION symbol in the |
1963 | // normal symbol table. This will be true if there is a relocation | |
1964 | // which needs it. | |
1965 | bool needs_symtab_index_ : 1; | |
1966 | // Whether this output section needs a STT_SECTION symbol in the | |
1967 | // dynamic symbol table. This will be true if there is a dynamic | |
1968 | // relocation which needs it. | |
1969 | bool needs_dynsym_index_ : 1; | |
16649710 ILT |
1970 | // Whether the link field of this output section should point to the |
1971 | // normal symbol table. | |
1972 | bool should_link_to_symtab_ : 1; | |
1973 | // Whether the link field of this output section should point to the | |
1974 | // dynamic symbol table. | |
1975 | bool should_link_to_dynsym_ : 1; | |
730cdc88 ILT |
1976 | // Whether this section should be written after all the input |
1977 | // sections are complete. | |
1978 | bool after_input_sections_ : 1; | |
27bc2bce ILT |
1979 | // Whether this section requires post processing after all |
1980 | // relocations have been applied. | |
1981 | bool requires_postprocessing_ : 1; | |
7bf1f802 ILT |
1982 | // For SHT_TLS sections, the offset of this section relative to the base |
1983 | // of the TLS segment. | |
1984 | uint64_t tls_offset_; | |
a2fb1b05 ILT |
1985 | }; |
1986 | ||
1987 | // An output segment. PT_LOAD segments are built from collections of | |
1988 | // output sections. Other segments typically point within PT_LOAD | |
1989 | // segments, and are built directly as needed. | |
1990 | ||
1991 | class Output_segment | |
1992 | { | |
1993 | public: | |
1994 | // Create an output segment, specifying the type and flags. | |
1995 | Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word); | |
1996 | ||
1997 | // Return the virtual address. | |
1998 | uint64_t | |
1999 | vaddr() const | |
2000 | { return this->vaddr_; } | |
2001 | ||
2002 | // Return the physical address. | |
2003 | uint64_t | |
2004 | paddr() const | |
2005 | { return this->paddr_; } | |
2006 | ||
2007 | // Return the segment type. | |
2008 | elfcpp::Elf_Word | |
2009 | type() const | |
2010 | { return this->type_; } | |
2011 | ||
2012 | // Return the segment flags. | |
2013 | elfcpp::Elf_Word | |
2014 | flags() const | |
2015 | { return this->flags_; } | |
2016 | ||
92e059d8 ILT |
2017 | // Return the memory size. |
2018 | uint64_t | |
2019 | memsz() const | |
2020 | { return this->memsz_; } | |
2021 | ||
ead1e424 ILT |
2022 | // Return the file size. |
2023 | off_t | |
2024 | filesz() const | |
2025 | { return this->filesz_; } | |
2026 | ||
75f65a3e ILT |
2027 | // Return the maximum alignment of the Output_data. |
2028 | uint64_t | |
ead1e424 | 2029 | addralign(); |
75f65a3e | 2030 | |
a2fb1b05 ILT |
2031 | // Add an Output_section to this segment. |
2032 | void | |
dbe717ef ILT |
2033 | add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) |
2034 | { this->add_output_section(os, seg_flags, false); } | |
2035 | ||
2036 | // Add an Output_section to the start of this segment. | |
2037 | void | |
2038 | add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) | |
2039 | { this->add_output_section(os, seg_flags, true); } | |
75f65a3e ILT |
2040 | |
2041 | // Add an Output_data (which is not an Output_section) to the start | |
2042 | // of this segment. | |
2043 | void | |
2044 | add_initial_output_data(Output_data*); | |
2045 | ||
4f4c5f80 ILT |
2046 | // Return the number of dynamic relocations applied to this segment. |
2047 | unsigned int | |
2048 | dynamic_reloc_count() const; | |
2049 | ||
75f65a3e ILT |
2050 | // Set the address of the segment to ADDR and the offset to *POFF |
2051 | // (aligned if necessary), and set the addresses and offsets of all | |
ead1e424 ILT |
2052 | // contained output sections accordingly. Set the section indexes |
2053 | // of all contained output sections starting with *PSHNDX. Return | |
2054 | // the address of the immediately following segment. Update *POFF | |
2055 | // and *PSHNDX. This should only be called for a PT_LOAD segment. | |
75f65a3e | 2056 | uint64_t |
ead1e424 | 2057 | set_section_addresses(uint64_t addr, off_t* poff, unsigned int* pshndx); |
75f65a3e | 2058 | |
0496d5e5 ILT |
2059 | // Set the minimum alignment of this segment. This may be adjusted |
2060 | // upward based on the section alignments. | |
2061 | void | |
2062 | set_minimum_addralign(uint64_t align) | |
2063 | { | |
2064 | gold_assert(!this->is_align_known_); | |
2065 | this->align_ = align; | |
2066 | } | |
2067 | ||
75f65a3e ILT |
2068 | // Set the offset of this segment based on the section. This should |
2069 | // only be called for a non-PT_LOAD segment. | |
2070 | void | |
2071 | set_offset(); | |
2072 | ||
7bf1f802 ILT |
2073 | // Set the TLS offsets of the sections contained in the PT_TLS segment. |
2074 | void | |
2075 | set_tls_offsets(); | |
2076 | ||
75f65a3e ILT |
2077 | // Return the number of output sections. |
2078 | unsigned int | |
2079 | output_section_count() const; | |
a2fb1b05 | 2080 | |
61ba1cf9 ILT |
2081 | // Write the segment header into *OPHDR. |
2082 | template<int size, bool big_endian> | |
2083 | void | |
ead1e424 | 2084 | write_header(elfcpp::Phdr_write<size, big_endian>*); |
61ba1cf9 ILT |
2085 | |
2086 | // Write the section headers of associated sections into V. | |
2087 | template<int size, bool big_endian> | |
2088 | unsigned char* | |
16649710 | 2089 | write_section_headers(const Layout*, const Stringpool*, unsigned char* v, |
ead1e424 | 2090 | unsigned int* pshndx ACCEPT_SIZE_ENDIAN) const; |
61ba1cf9 | 2091 | |
a2fb1b05 ILT |
2092 | private: |
2093 | Output_segment(const Output_segment&); | |
2094 | Output_segment& operator=(const Output_segment&); | |
2095 | ||
54dc6425 | 2096 | typedef std::list<Output_data*> Output_data_list; |
a2fb1b05 | 2097 | |
dbe717ef ILT |
2098 | // Add an Output_section to this segment, specifying front or back. |
2099 | void | |
2100 | add_output_section(Output_section*, elfcpp::Elf_Word seg_flags, | |
2101 | bool front); | |
2102 | ||
ead1e424 ILT |
2103 | // Find the maximum alignment in an Output_data_list. |
2104 | static uint64_t | |
2105 | maximum_alignment(const Output_data_list*); | |
2106 | ||
75f65a3e ILT |
2107 | // Set the section addresses in an Output_data_list. |
2108 | uint64_t | |
ead1e424 ILT |
2109 | set_section_list_addresses(Output_data_list*, uint64_t addr, off_t* poff, |
2110 | unsigned int* pshndx); | |
75f65a3e ILT |
2111 | |
2112 | // Return the number of Output_sections in an Output_data_list. | |
2113 | unsigned int | |
2114 | output_section_count_list(const Output_data_list*) const; | |
2115 | ||
4f4c5f80 ILT |
2116 | // Return the number of dynamic relocs in an Output_data_list. |
2117 | unsigned int | |
2118 | dynamic_reloc_count_list(const Output_data_list*) const; | |
2119 | ||
61ba1cf9 ILT |
2120 | // Write the section headers in the list into V. |
2121 | template<int size, bool big_endian> | |
2122 | unsigned char* | |
16649710 ILT |
2123 | write_section_headers_list(const Layout*, const Stringpool*, |
2124 | const Output_data_list*, unsigned char* v, | |
ead1e424 | 2125 | unsigned int* pshdx ACCEPT_SIZE_ENDIAN) const; |
61ba1cf9 | 2126 | |
75f65a3e | 2127 | // The list of output data with contents attached to this segment. |
54dc6425 | 2128 | Output_data_list output_data_; |
75f65a3e ILT |
2129 | // The list of output data without contents attached to this segment. |
2130 | Output_data_list output_bss_; | |
a2fb1b05 ILT |
2131 | // The segment virtual address. |
2132 | uint64_t vaddr_; | |
2133 | // The segment physical address. | |
2134 | uint64_t paddr_; | |
2135 | // The size of the segment in memory. | |
2136 | uint64_t memsz_; | |
0496d5e5 ILT |
2137 | // The segment alignment. The is_align_known_ field indicates |
2138 | // whether this has been finalized. It can be set to a minimum | |
2139 | // value before it is finalized. | |
a2fb1b05 ILT |
2140 | uint64_t align_; |
2141 | // The offset of the segment data within the file. | |
2142 | off_t offset_; | |
2143 | // The size of the segment data in the file. | |
2144 | off_t filesz_; | |
2145 | // The segment type; | |
2146 | elfcpp::Elf_Word type_; | |
2147 | // The segment flags. | |
2148 | elfcpp::Elf_Word flags_; | |
0496d5e5 | 2149 | // Whether we have finalized align_. |
ead1e424 | 2150 | bool is_align_known_; |
a2fb1b05 ILT |
2151 | }; |
2152 | ||
61ba1cf9 | 2153 | // This class represents the output file. |
a2fb1b05 ILT |
2154 | |
2155 | class Output_file | |
2156 | { | |
2157 | public: | |
c51e6221 ILT |
2158 | Output_file(const General_options& options, Target*); |
2159 | ||
2160 | // Get a pointer to the target. | |
2161 | Target* | |
2162 | target() const | |
2163 | { return this->target_; } | |
61ba1cf9 ILT |
2164 | |
2165 | // Open the output file. FILE_SIZE is the final size of the file. | |
2166 | void | |
2167 | open(off_t file_size); | |
2168 | ||
27bc2bce ILT |
2169 | // Resize the output file. |
2170 | void | |
2171 | resize(off_t file_size); | |
2172 | ||
c420411f ILT |
2173 | // Close the output file (flushing all buffered data) and make sure |
2174 | // there are no errors. | |
61ba1cf9 ILT |
2175 | void |
2176 | close(); | |
2177 | ||
2178 | // We currently always use mmap which makes the view handling quite | |
2179 | // simple. In the future we may support other approaches. | |
a2fb1b05 ILT |
2180 | |
2181 | // Write data to the output file. | |
2182 | void | |
61ba1cf9 ILT |
2183 | write(off_t offset, const void* data, off_t len) |
2184 | { memcpy(this->base_ + offset, data, len); } | |
2185 | ||
2186 | // Get a buffer to use to write to the file, given the offset into | |
2187 | // the file and the size. | |
2188 | unsigned char* | |
2189 | get_output_view(off_t start, off_t size) | |
2190 | { | |
a3ad94ed | 2191 | gold_assert(start >= 0 && size >= 0 && start + size <= this->file_size_); |
61ba1cf9 ILT |
2192 | return this->base_ + start; |
2193 | } | |
2194 | ||
2195 | // VIEW must have been returned by get_output_view. Write the | |
2196 | // buffer to the file, passing in the offset and the size. | |
2197 | void | |
2198 | write_output_view(off_t, off_t, unsigned char*) | |
2199 | { } | |
2200 | ||
730cdc88 ILT |
2201 | // Get a read/write buffer. This is used when we want to write part |
2202 | // of the file, read it in, and write it again. | |
2203 | unsigned char* | |
2204 | get_input_output_view(off_t start, off_t size) | |
2205 | { return this->get_output_view(start, size); } | |
2206 | ||
2207 | // Write a read/write buffer back to the file. | |
2208 | void | |
2209 | write_input_output_view(off_t, off_t, unsigned char*) | |
2210 | { } | |
2211 | ||
2212 | // Get a read buffer. This is used when we just want to read part | |
2213 | // of the file back it in. | |
2214 | const unsigned char* | |
2215 | get_input_view(off_t start, off_t size) | |
2216 | { return this->get_output_view(start, size); } | |
2217 | ||
2218 | // Release a read bfufer. | |
2219 | void | |
2220 | free_input_view(off_t, off_t, const unsigned char*) | |
2221 | { } | |
2222 | ||
61ba1cf9 | 2223 | private: |
c420411f | 2224 | // Map the file into memory and return a pointer to the map. |
27bc2bce ILT |
2225 | void |
2226 | map(); | |
2227 | ||
c420411f ILT |
2228 | // Unmap the file from memory (and flush to disk buffers). |
2229 | void | |
2230 | unmap(); | |
2231 | ||
2232 | ||
61ba1cf9 ILT |
2233 | // General options. |
2234 | const General_options& options_; | |
c51e6221 ILT |
2235 | // Target. |
2236 | Target* target_; | |
61ba1cf9 ILT |
2237 | // File name. |
2238 | const char* name_; | |
2239 | // File descriptor. | |
2240 | int o_; | |
2241 | // File size. | |
2242 | off_t file_size_; | |
2243 | // Base of file mapped into memory. | |
2244 | unsigned char* base_; | |
c420411f ILT |
2245 | // True iff base_ points to a memory buffer rather than an output file. |
2246 | bool map_is_anonymous_; | |
a2fb1b05 ILT |
2247 | }; |
2248 | ||
2249 | } // End namespace gold. | |
2250 | ||
2251 | #endif // !defined(GOLD_OUTPUT_H) |