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