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a2fb1b05 ILT |
1 | // output.h -- manage the output file for gold -*- C++ -*- |
2 | ||
3 | #ifndef GOLD_OUTPUT_H | |
4 | #define GOLD_OUTPUT_H | |
5 | ||
6 | #include <list> | |
ead1e424 | 7 | #include <vector> |
a2fb1b05 ILT |
8 | |
9 | #include "elfcpp.h" | |
54dc6425 | 10 | #include "layout.h" |
c06b7b0b | 11 | #include "reloc-types.h" |
a2fb1b05 ILT |
12 | |
13 | namespace gold | |
14 | { | |
15 | ||
61ba1cf9 | 16 | class General_options; |
a2fb1b05 | 17 | class Object; |
a3ad94ed | 18 | class Symbol; |
a2fb1b05 | 19 | class Output_file; |
c06b7b0b | 20 | class Output_section; |
a3ad94ed | 21 | class Target; |
54dc6425 ILT |
22 | template<int size, bool big_endian> |
23 | class Sized_target; | |
c06b7b0b ILT |
24 | template<int size, bool big_endian> |
25 | class Sized_relobj; | |
54dc6425 ILT |
26 | |
27 | // An abtract class for data which has to go into the output file. | |
a2fb1b05 ILT |
28 | |
29 | class Output_data | |
30 | { | |
31 | public: | |
75f65a3e | 32 | explicit Output_data(off_t data_size = 0) |
61ba1cf9 | 33 | : address_(0), data_size_(data_size), offset_(-1) |
a2fb1b05 ILT |
34 | { } |
35 | ||
36 | virtual | |
37 | ~Output_data(); | |
38 | ||
ead1e424 ILT |
39 | // Return the address. This is only valid after Layout::finalize is |
40 | // finished. | |
75f65a3e ILT |
41 | uint64_t |
42 | address() const | |
43 | { return this->address_; } | |
44 | ||
ead1e424 ILT |
45 | // Return the size of the data. This must be valid after |
46 | // Layout::finalize calls set_address, but need not be valid before | |
47 | // then. | |
a2fb1b05 | 48 | off_t |
75f65a3e ILT |
49 | data_size() const |
50 | { return this->data_size_; } | |
51 | ||
ead1e424 ILT |
52 | // Return the file offset. This is only valid after |
53 | // Layout::finalize is finished. | |
75f65a3e ILT |
54 | off_t |
55 | offset() const | |
56 | { return this->offset_; } | |
57 | ||
58 | // Return the required alignment. | |
59 | uint64_t | |
60 | addralign() const | |
61 | { return this->do_addralign(); } | |
62 | ||
63 | // Return whether this is an Output_section. | |
64 | bool | |
65 | is_section() const | |
66 | { return this->do_is_section(); } | |
67 | ||
68 | // Return whether this is an Output_section of the specified type. | |
69 | bool | |
70 | is_section_type(elfcpp::Elf_Word stt) const | |
71 | { return this->do_is_section_type(stt); } | |
72 | ||
73 | // Return whether this is an Output_section with the specified flag | |
74 | // set. | |
75 | bool | |
76 | is_section_flag_set(elfcpp::Elf_Xword shf) const | |
77 | { return this->do_is_section_flag_set(shf); } | |
78 | ||
ead1e424 ILT |
79 | // Return the output section index, if there is an output section. |
80 | unsigned int | |
81 | out_shndx() const | |
82 | { return this->do_out_shndx(); } | |
83 | ||
84 | // Set the output section index, if this is an output section. | |
85 | void | |
86 | set_out_shndx(unsigned int shndx) | |
87 | { this->do_set_out_shndx(shndx); } | |
88 | ||
89 | // Set the address and file offset of this data. This is called | |
90 | // during Layout::finalize. | |
75f65a3e ILT |
91 | void |
92 | set_address(uint64_t addr, off_t off); | |
93 | ||
ead1e424 ILT |
94 | // Write the data to the output file. This is called after |
95 | // Layout::finalize is complete. | |
75f65a3e ILT |
96 | void |
97 | write(Output_file* file) | |
98 | { this->do_write(file); } | |
a2fb1b05 | 99 | |
a3ad94ed ILT |
100 | // This is called by Layout::finalize to note that all sizes must |
101 | // now be fixed. | |
102 | static void | |
103 | layout_complete() | |
104 | { Output_data::sizes_are_fixed = true; } | |
105 | ||
75f65a3e ILT |
106 | protected: |
107 | // Functions that child classes may or in some cases must implement. | |
108 | ||
109 | // Write the data to the output file. | |
a2fb1b05 | 110 | virtual void |
75f65a3e ILT |
111 | do_write(Output_file*) = 0; |
112 | ||
113 | // Return the required alignment. | |
114 | virtual uint64_t | |
115 | do_addralign() const = 0; | |
116 | ||
117 | // Return whether this is an Output_section. | |
118 | virtual bool | |
119 | do_is_section() const | |
120 | { return false; } | |
a2fb1b05 | 121 | |
54dc6425 | 122 | // Return whether this is an Output_section of the specified type. |
75f65a3e | 123 | // This only needs to be implement by Output_section. |
54dc6425 | 124 | virtual bool |
75f65a3e | 125 | do_is_section_type(elfcpp::Elf_Word) const |
54dc6425 ILT |
126 | { return false; } |
127 | ||
75f65a3e ILT |
128 | // Return whether this is an Output_section with the specific flag |
129 | // set. This only needs to be implemented by Output_section. | |
54dc6425 | 130 | virtual bool |
75f65a3e | 131 | do_is_section_flag_set(elfcpp::Elf_Xword) const |
54dc6425 ILT |
132 | { return false; } |
133 | ||
ead1e424 ILT |
134 | // Return the output section index, if there is an output section. |
135 | virtual unsigned int | |
136 | do_out_shndx() const | |
a3ad94ed | 137 | { gold_unreachable(); } |
ead1e424 ILT |
138 | |
139 | // Set the output section index, if this is an output section. | |
140 | virtual void | |
141 | do_set_out_shndx(unsigned int) | |
a3ad94ed | 142 | { gold_unreachable(); } |
ead1e424 | 143 | |
75f65a3e | 144 | // Set the address and file offset of the data. This only needs to |
a3ad94ed ILT |
145 | // be implemented if the child needs to know. The child class can |
146 | // set its size in this call. | |
75f65a3e ILT |
147 | virtual void |
148 | do_set_address(uint64_t, off_t) | |
149 | { } | |
150 | ||
151 | // Functions that child classes may call. | |
152 | ||
a2fb1b05 ILT |
153 | // Set the size of the data. |
154 | void | |
75f65a3e | 155 | set_data_size(off_t data_size) |
a3ad94ed ILT |
156 | { |
157 | gold_assert(!Output_data::sizes_are_fixed); | |
158 | this->data_size_ = data_size; | |
159 | } | |
75f65a3e ILT |
160 | |
161 | // Return default alignment for a size--32 or 64. | |
162 | static uint64_t | |
163 | default_alignment(int size); | |
a2fb1b05 ILT |
164 | |
165 | private: | |
166 | Output_data(const Output_data&); | |
167 | Output_data& operator=(const Output_data&); | |
168 | ||
a3ad94ed ILT |
169 | // This is used for verification, to make sure that we don't try to |
170 | // change any sizes after we set the section addresses. | |
171 | static bool sizes_are_fixed; | |
172 | ||
75f65a3e ILT |
173 | // Memory address in file (not always meaningful). |
174 | uint64_t address_; | |
a2fb1b05 | 175 | // Size of data in file. |
75f65a3e ILT |
176 | off_t data_size_; |
177 | // Offset within file. | |
178 | off_t offset_; | |
a2fb1b05 ILT |
179 | }; |
180 | ||
54dc6425 ILT |
181 | // Output the section headers. |
182 | ||
183 | class Output_section_headers : public Output_data | |
184 | { | |
185 | public: | |
75f65a3e | 186 | Output_section_headers(int size, |
61ba1cf9 | 187 | bool big_endian, |
16649710 ILT |
188 | const Layout*, |
189 | const Layout::Segment_list*, | |
190 | const Layout::Section_list*, | |
61ba1cf9 | 191 | const Stringpool*); |
54dc6425 ILT |
192 | |
193 | // Write the data to the file. | |
194 | void | |
75f65a3e ILT |
195 | do_write(Output_file*); |
196 | ||
197 | // Return the required alignment. | |
198 | uint64_t | |
199 | do_addralign() const | |
200 | { return Output_data::default_alignment(this->size_); } | |
54dc6425 ILT |
201 | |
202 | private: | |
61ba1cf9 ILT |
203 | // Write the data to the file with the right size and endianness. |
204 | template<int size, bool big_endian> | |
205 | void | |
206 | do_sized_write(Output_file*); | |
207 | ||
75f65a3e | 208 | int size_; |
61ba1cf9 | 209 | bool big_endian_; |
16649710 ILT |
210 | const Layout* layout_; |
211 | const Layout::Segment_list* segment_list_; | |
212 | const Layout::Section_list* unattached_section_list_; | |
61ba1cf9 | 213 | const Stringpool* secnamepool_; |
54dc6425 ILT |
214 | }; |
215 | ||
216 | // Output the segment headers. | |
217 | ||
218 | class Output_segment_headers : public Output_data | |
219 | { | |
220 | public: | |
61ba1cf9 ILT |
221 | Output_segment_headers(int size, bool big_endian, |
222 | const Layout::Segment_list& segment_list); | |
54dc6425 ILT |
223 | |
224 | // Write the data to the file. | |
225 | void | |
75f65a3e ILT |
226 | do_write(Output_file*); |
227 | ||
228 | // Return the required alignment. | |
229 | uint64_t | |
230 | do_addralign() const | |
231 | { return Output_data::default_alignment(this->size_); } | |
54dc6425 ILT |
232 | |
233 | private: | |
61ba1cf9 ILT |
234 | // Write the data to the file with the right size and endianness. |
235 | template<int size, bool big_endian> | |
236 | void | |
237 | do_sized_write(Output_file*); | |
238 | ||
75f65a3e | 239 | int size_; |
61ba1cf9 | 240 | bool big_endian_; |
54dc6425 ILT |
241 | const Layout::Segment_list& segment_list_; |
242 | }; | |
243 | ||
244 | // Output the ELF file header. | |
245 | ||
246 | class Output_file_header : public Output_data | |
247 | { | |
248 | public: | |
75f65a3e | 249 | Output_file_header(int size, |
61ba1cf9 | 250 | bool big_endian, |
75f65a3e | 251 | const General_options&, |
54dc6425 ILT |
252 | const Target*, |
253 | const Symbol_table*, | |
75f65a3e ILT |
254 | const Output_segment_headers*); |
255 | ||
256 | // Add information about the section headers. We lay out the ELF | |
257 | // file header before we create the section headers. | |
258 | void set_section_info(const Output_section_headers*, | |
259 | const Output_section* shstrtab); | |
54dc6425 ILT |
260 | |
261 | // Write the data to the file. | |
262 | void | |
75f65a3e ILT |
263 | do_write(Output_file*); |
264 | ||
265 | // Return the required alignment. | |
266 | uint64_t | |
267 | do_addralign() const | |
268 | { return Output_data::default_alignment(this->size_); } | |
269 | ||
270 | // Set the address and offset--we only implement this for error | |
271 | // checking. | |
272 | void | |
273 | do_set_address(uint64_t, off_t off) const | |
a3ad94ed | 274 | { gold_assert(off == 0); } |
54dc6425 ILT |
275 | |
276 | private: | |
61ba1cf9 ILT |
277 | // Write the data to the file with the right size and endianness. |
278 | template<int size, bool big_endian> | |
279 | void | |
280 | do_sized_write(Output_file*); | |
281 | ||
75f65a3e | 282 | int size_; |
61ba1cf9 | 283 | bool big_endian_; |
54dc6425 ILT |
284 | const General_options& options_; |
285 | const Target* target_; | |
286 | const Symbol_table* symtab_; | |
61ba1cf9 | 287 | const Output_segment_headers* segment_header_; |
54dc6425 ILT |
288 | const Output_section_headers* section_header_; |
289 | const Output_section* shstrtab_; | |
290 | }; | |
291 | ||
ead1e424 ILT |
292 | // Output sections are mainly comprised of input sections. However, |
293 | // there are cases where we have data to write out which is not in an | |
294 | // input section. Output_section_data is used in such cases. This is | |
295 | // an abstract base class. | |
296 | ||
297 | class Output_section_data : public Output_data | |
298 | { | |
299 | public: | |
300 | Output_section_data(off_t data_size, uint64_t addralign) | |
301 | : Output_data(data_size), output_section_(NULL), addralign_(addralign) | |
302 | { } | |
303 | ||
304 | Output_section_data(uint64_t addralign) | |
305 | : Output_data(0), output_section_(NULL), addralign_(addralign) | |
306 | { } | |
307 | ||
16649710 ILT |
308 | // Return the output section. |
309 | const Output_section* | |
310 | output_section() const | |
311 | { return this->output_section_; } | |
312 | ||
ead1e424 ILT |
313 | // Record the output section. |
314 | void | |
16649710 | 315 | set_output_section(Output_section* os); |
ead1e424 ILT |
316 | |
317 | protected: | |
318 | // The child class must implement do_write. | |
319 | ||
16649710 ILT |
320 | // The child class may implement specific adjustments to the output |
321 | // section. | |
322 | virtual void | |
323 | do_adjust_output_section(Output_section*) | |
324 | { } | |
325 | ||
ead1e424 ILT |
326 | // Return the required alignment. |
327 | uint64_t | |
328 | do_addralign() const | |
329 | { return this->addralign_; } | |
330 | ||
331 | // Return the section index of the output section. | |
332 | unsigned int | |
333 | do_out_shndx() const; | |
334 | ||
5a6f7e2d ILT |
335 | // Set the alignment. |
336 | void | |
337 | set_addralign(uint64_t addralign) | |
338 | { this->addralign_ = addralign; } | |
339 | ||
ead1e424 ILT |
340 | private: |
341 | // The output section for this section. | |
342 | const Output_section* output_section_; | |
343 | // The required alignment. | |
344 | uint64_t addralign_; | |
345 | }; | |
346 | ||
dbe717ef ILT |
347 | // A simple case of Output_data in which we have constant data to |
348 | // output. | |
ead1e424 | 349 | |
dbe717ef | 350 | class Output_data_const : public Output_section_data |
ead1e424 ILT |
351 | { |
352 | public: | |
dbe717ef ILT |
353 | Output_data_const(const std::string& data, uint64_t addralign) |
354 | : Output_section_data(data.size(), addralign), data_(data) | |
355 | { } | |
356 | ||
357 | Output_data_const(const char* p, off_t len, uint64_t addralign) | |
358 | : Output_section_data(len, addralign), data_(p, len) | |
359 | { } | |
360 | ||
361 | Output_data_const(const unsigned char* p, off_t len, uint64_t addralign) | |
362 | : Output_section_data(len, addralign), | |
363 | data_(reinterpret_cast<const char*>(p), len) | |
364 | { } | |
365 | ||
a3ad94ed ILT |
366 | // Add more data. |
367 | void | |
368 | add_data(const std::string& add) | |
369 | { | |
370 | this->data_.append(add); | |
371 | this->set_data_size(this->data_.size()); | |
372 | } | |
373 | ||
374 | // Write the data to the output file. | |
dbe717ef | 375 | void |
a3ad94ed | 376 | do_write(Output_file*); |
dbe717ef ILT |
377 | |
378 | private: | |
379 | std::string data_; | |
380 | }; | |
381 | ||
a3ad94ed ILT |
382 | // Another version of Output_data with constant data, in which the |
383 | // buffer is allocated by the caller. | |
dbe717ef | 384 | |
a3ad94ed | 385 | class Output_data_const_buffer : public Output_section_data |
dbe717ef ILT |
386 | { |
387 | public: | |
a3ad94ed ILT |
388 | Output_data_const_buffer(const unsigned char* p, off_t len, |
389 | uint64_t addralign) | |
390 | : Output_section_data(len, addralign), p_(p) | |
391 | { } | |
392 | ||
393 | // Write the data the output file. | |
394 | void | |
395 | do_write(Output_file*); | |
396 | ||
397 | private: | |
398 | const unsigned char* p_; | |
399 | }; | |
400 | ||
401 | // A place holder for data written out via some other mechanism. | |
402 | ||
403 | class Output_data_space : public Output_section_data | |
404 | { | |
405 | public: | |
406 | Output_data_space(off_t data_size, uint64_t addralign) | |
407 | : Output_section_data(data_size, addralign) | |
408 | { } | |
409 | ||
410 | explicit Output_data_space(uint64_t addralign) | |
ead1e424 ILT |
411 | : Output_section_data(addralign) |
412 | { } | |
413 | ||
414 | // Set the size. | |
415 | void | |
a3ad94ed ILT |
416 | set_space_size(off_t space_size) |
417 | { this->set_data_size(space_size); } | |
ead1e424 | 418 | |
5a6f7e2d ILT |
419 | // Set the alignment. |
420 | void | |
421 | set_space_alignment(uint64_t align) | |
422 | { this->set_addralign(align); } | |
423 | ||
a3ad94ed | 424 | // Write out the data--this must be handled elsewhere. |
ead1e424 ILT |
425 | void |
426 | do_write(Output_file*) | |
427 | { } | |
428 | }; | |
429 | ||
a3ad94ed ILT |
430 | // A string table which goes into an output section. |
431 | ||
432 | class Output_data_strtab : public Output_section_data | |
433 | { | |
434 | public: | |
435 | Output_data_strtab(Stringpool* strtab) | |
436 | : Output_section_data(1), strtab_(strtab) | |
437 | { } | |
438 | ||
439 | // This is called to set the address and file offset. Here we make | |
440 | // sure that the Stringpool is finalized. | |
441 | void | |
442 | do_set_address(uint64_t, off_t); | |
443 | ||
444 | // Write out the data. | |
445 | void | |
446 | do_write(Output_file*); | |
447 | ||
448 | private: | |
449 | Stringpool* strtab_; | |
450 | }; | |
451 | ||
c06b7b0b ILT |
452 | // This POD class is used to represent a single reloc in the output |
453 | // file. This could be a private class within Output_data_reloc, but | |
454 | // the templatization is complex enough that I broke it out into a | |
455 | // separate class. The class is templatized on either elfcpp::SHT_REL | |
456 | // or elfcpp::SHT_RELA, and also on whether this is a dynamic | |
457 | // relocation or an ordinary relocation. | |
458 | ||
459 | // A relocation can be against a global symbol, a local symbol, an | |
460 | // output section, or the undefined symbol at index 0. We represent | |
461 | // the latter by using a NULL global symbol. | |
462 | ||
463 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
464 | class Output_reloc; | |
465 | ||
466 | template<bool dynamic, int size, bool big_endian> | |
467 | class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> | |
468 | { | |
469 | public: | |
470 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
471 | ||
472 | // An uninitialized entry. We need this because we want to put | |
473 | // instances of this class into an STL container. | |
474 | Output_reloc() | |
475 | : local_sym_index_(INVALID_CODE) | |
476 | { } | |
477 | ||
478 | // A reloc against a global symbol. | |
5a6f7e2d | 479 | |
a3ad94ed ILT |
480 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
481 | Address address) | |
5a6f7e2d ILT |
482 | : address_(address), local_sym_index_(GSYM_CODE), type_(type), |
483 | shndx_(INVALID_CODE) | |
484 | { | |
485 | this->u1_.gsym = gsym; | |
486 | this->u2_.od = od; | |
487 | } | |
488 | ||
489 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, | |
490 | unsigned int shndx, Address address) | |
491 | : address_(address), local_sym_index_(GSYM_CODE), type_(type), | |
492 | shndx_(shndx) | |
493 | { | |
494 | gold_assert(shndx != INVALID_CODE); | |
495 | this->u1_.gsym = gsym; | |
496 | this->u2_.relobj = relobj; | |
497 | } | |
c06b7b0b ILT |
498 | |
499 | // A reloc against a local symbol. | |
5a6f7e2d ILT |
500 | |
501 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
c06b7b0b | 502 | unsigned int local_sym_index, |
a3ad94ed ILT |
503 | unsigned int type, |
504 | Output_data* od, | |
505 | Address address) | |
5a6f7e2d ILT |
506 | : address_(address), local_sym_index_(local_sym_index), type_(type), |
507 | shndx_(INVALID_CODE) | |
c06b7b0b | 508 | { |
a3ad94ed ILT |
509 | gold_assert(local_sym_index != GSYM_CODE |
510 | && local_sym_index != INVALID_CODE); | |
5a6f7e2d ILT |
511 | this->u1_.relobj = relobj; |
512 | this->u2_.od = od; | |
513 | } | |
514 | ||
515 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
516 | unsigned int local_sym_index, | |
517 | unsigned int type, | |
518 | unsigned int shndx, | |
519 | Address address) | |
520 | : address_(address), local_sym_index_(local_sym_index), type_(type), | |
521 | shndx_(shndx) | |
522 | { | |
523 | gold_assert(local_sym_index != GSYM_CODE | |
524 | && local_sym_index != INVALID_CODE); | |
525 | gold_assert(shndx != INVALID_CODE); | |
526 | this->u1_.relobj = relobj; | |
527 | this->u2_.relobj = relobj; | |
c06b7b0b ILT |
528 | } |
529 | ||
530 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 531 | |
a3ad94ed ILT |
532 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
533 | Address address) | |
5a6f7e2d ILT |
534 | : address_(address), local_sym_index_(SECTION_CODE), type_(type), |
535 | shndx_(INVALID_CODE) | |
536 | { | |
537 | this->u1_.os = os; | |
538 | this->u2_.od = od; | |
539 | } | |
540 | ||
541 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, | |
542 | unsigned int shndx, Address address) | |
543 | : address_(address), local_sym_index_(SECTION_CODE), type_(type), | |
544 | shndx_(shndx) | |
545 | { | |
546 | gold_assert(shndx != INVALID_CODE); | |
547 | this->u1_.os = os; | |
548 | this->u2_.relobj = relobj; | |
549 | } | |
c06b7b0b ILT |
550 | |
551 | // Write the reloc entry to an output view. | |
552 | void | |
553 | write(unsigned char* pov) const; | |
554 | ||
555 | // Write the offset and info fields to Write_rel. | |
556 | template<typename Write_rel> | |
557 | void write_rel(Write_rel*) const; | |
558 | ||
559 | private: | |
560 | // Return the symbol index. We can't do a double template | |
561 | // specialization, so we do a secondary template here. | |
562 | unsigned int | |
563 | get_symbol_index() const; | |
564 | ||
565 | // Codes for local_sym_index_. | |
566 | enum | |
567 | { | |
568 | // Global symbol. | |
569 | GSYM_CODE = -1U, | |
570 | // Output section. | |
571 | SECTION_CODE = -2U, | |
572 | // Invalid uninitialized entry. | |
573 | INVALID_CODE = -3U | |
574 | }; | |
575 | ||
576 | union | |
577 | { | |
578 | // For a local symbol, the object. We will never generate a | |
579 | // relocation against a local symbol in a dynamic object; that | |
580 | // doesn't make sense. And our callers will always be | |
581 | // templatized, so we use Sized_relobj here. | |
5a6f7e2d | 582 | Sized_relobj<size, big_endian>* relobj; |
c06b7b0b ILT |
583 | // For a global symbol, the symbol. If this is NULL, it indicates |
584 | // a relocation against the undefined 0 symbol. | |
585 | Symbol* gsym; | |
586 | // For a relocation against an output section, the output section. | |
587 | Output_section* os; | |
5a6f7e2d ILT |
588 | } u1_; |
589 | union | |
590 | { | |
591 | // If shndx_ is not INVALID CODE, the object which holds the input | |
592 | // section being used to specify the reloc address. | |
593 | Relobj* relobj; | |
594 | // If shndx_ is INVALID_CODE, the output data being used to | |
595 | // specify the reloc address. This may be NULL if the reloc | |
596 | // address is absolute. | |
597 | Output_data* od; | |
598 | } u2_; | |
599 | // The address offset within the input section or the Output_data. | |
600 | Address address_; | |
c06b7b0b ILT |
601 | // For a local symbol, the local symbol index. This is GSYM_CODE |
602 | // for a global symbol, or INVALID_CODE for an uninitialized value. | |
603 | unsigned int local_sym_index_; | |
a3ad94ed | 604 | // The reloc type--a processor specific code. |
c06b7b0b | 605 | unsigned int type_; |
5a6f7e2d ILT |
606 | // If the reloc address is an input section in an object, the |
607 | // section index. This is INVALID_CODE if the reloc address is | |
608 | // specified in some other way. | |
609 | unsigned int shndx_; | |
c06b7b0b ILT |
610 | }; |
611 | ||
612 | // The SHT_RELA version of Output_reloc<>. This is just derived from | |
613 | // the SHT_REL version of Output_reloc, but it adds an addend. | |
614 | ||
615 | template<bool dynamic, int size, bool big_endian> | |
616 | class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
617 | { | |
618 | public: | |
619 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
620 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
621 | ||
622 | // An uninitialized entry. | |
623 | Output_reloc() | |
624 | : rel_() | |
625 | { } | |
626 | ||
627 | // A reloc against a global symbol. | |
5a6f7e2d | 628 | |
a3ad94ed ILT |
629 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
630 | Address address, Addend addend) | |
631 | : rel_(gsym, type, od, address), addend_(addend) | |
c06b7b0b ILT |
632 | { } |
633 | ||
5a6f7e2d ILT |
634 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, |
635 | unsigned int shndx, Address address, Addend addend) | |
636 | : rel_(gsym, type, relobj, shndx, address), addend_(addend) | |
637 | { } | |
638 | ||
c06b7b0b | 639 | // A reloc against a local symbol. |
5a6f7e2d ILT |
640 | |
641 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
c06b7b0b | 642 | unsigned int local_sym_index, |
a3ad94ed ILT |
643 | unsigned int type, Output_data* od, Address address, |
644 | Addend addend) | |
5a6f7e2d ILT |
645 | : rel_(relobj, local_sym_index, type, od, address), addend_(addend) |
646 | { } | |
647 | ||
648 | Output_reloc(Sized_relobj<size, big_endian>* relobj, | |
649 | unsigned int local_sym_index, | |
650 | unsigned int type, | |
651 | unsigned int shndx, | |
652 | Address address, | |
653 | Addend addend) | |
654 | : rel_(relobj, local_sym_index, type, shndx, address), | |
655 | addend_(addend) | |
c06b7b0b ILT |
656 | { } |
657 | ||
658 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 659 | |
a3ad94ed ILT |
660 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
661 | Address address, Addend addend) | |
662 | : rel_(os, type, od, address), addend_(addend) | |
c06b7b0b ILT |
663 | { } |
664 | ||
5a6f7e2d ILT |
665 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, |
666 | unsigned int shndx, Address address, Addend addend) | |
667 | : rel_(os, type, relobj, shndx, address), addend_(addend) | |
668 | { } | |
669 | ||
c06b7b0b ILT |
670 | // Write the reloc entry to an output view. |
671 | void | |
672 | write(unsigned char* pov) const; | |
673 | ||
674 | private: | |
675 | // The basic reloc. | |
676 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_; | |
677 | // The addend. | |
678 | Addend addend_; | |
679 | }; | |
680 | ||
681 | // Output_data_reloc is used to manage a section containing relocs. | |
682 | // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC | |
683 | // indicates whether this is a dynamic relocation or a normal | |
684 | // relocation. Output_data_reloc_base is a base class. | |
685 | // Output_data_reloc is the real class, which we specialize based on | |
686 | // the reloc type. | |
687 | ||
688 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
689 | class Output_data_reloc_base : public Output_section_data | |
690 | { | |
691 | public: | |
692 | typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type; | |
693 | typedef typename Output_reloc_type::Address Address; | |
694 | static const int reloc_size = | |
695 | Reloc_types<sh_type, size, big_endian>::reloc_size; | |
696 | ||
697 | // Construct the section. | |
698 | Output_data_reloc_base() | |
699 | : Output_section_data(Output_data::default_alignment(size)) | |
700 | { } | |
701 | ||
702 | // Write out the data. | |
703 | void | |
704 | do_write(Output_file*); | |
705 | ||
706 | protected: | |
16649710 ILT |
707 | // Set the entry size and the link. |
708 | void | |
709 | do_adjust_output_section(Output_section *os); | |
710 | ||
c06b7b0b ILT |
711 | // Add a relocation entry. |
712 | void | |
713 | add(const Output_reloc_type& reloc) | |
714 | { | |
715 | this->relocs_.push_back(reloc); | |
716 | this->set_data_size(this->relocs_.size() * reloc_size); | |
717 | } | |
718 | ||
719 | private: | |
720 | typedef std::vector<Output_reloc_type> Relocs; | |
721 | ||
722 | Relocs relocs_; | |
723 | }; | |
724 | ||
725 | // The class which callers actually create. | |
726 | ||
727 | template<int sh_type, bool dynamic, int size, bool big_endian> | |
728 | class Output_data_reloc; | |
729 | ||
730 | // The SHT_REL version of Output_data_reloc. | |
731 | ||
732 | template<bool dynamic, int size, bool big_endian> | |
733 | class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> | |
734 | : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian> | |
735 | { | |
736 | private: | |
737 | typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, | |
738 | big_endian> Base; | |
739 | ||
740 | public: | |
741 | typedef typename Base::Output_reloc_type Output_reloc_type; | |
742 | typedef typename Output_reloc_type::Address Address; | |
743 | ||
744 | Output_data_reloc() | |
745 | : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>() | |
746 | { } | |
747 | ||
748 | // Add a reloc against a global symbol. | |
5a6f7e2d | 749 | |
c06b7b0b | 750 | void |
a3ad94ed ILT |
751 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address) |
752 | { this->add(Output_reloc_type(gsym, type, od, address)); } | |
c06b7b0b | 753 | |
5a6f7e2d ILT |
754 | void |
755 | add_global(Symbol* gsym, unsigned int type, Relobj* relobj, | |
756 | unsigned int shndx, Address address) | |
757 | { this->add(Output_reloc_type(gsym, type, relobj, shndx, address)); } | |
758 | ||
c06b7b0b | 759 | // Add a reloc against a local symbol. |
5a6f7e2d | 760 | |
c06b7b0b | 761 | void |
5a6f7e2d | 762 | add_local(Sized_relobj<size, big_endian>* relobj, |
a3ad94ed ILT |
763 | unsigned int local_sym_index, unsigned int type, |
764 | Output_data* od, Address address) | |
5a6f7e2d ILT |
765 | { this->add(Output_reloc_type(relobj, local_sym_index, type, od, address)); } |
766 | ||
767 | void | |
768 | add_local(Sized_relobj<size, big_endian>* relobj, | |
769 | unsigned int local_sym_index, unsigned int type, | |
770 | unsigned int shndx, Address address) | |
771 | { this->add(Output_reloc_type(relobj, local_sym_index, type, shndx, | |
772 | address)); } | |
773 | ||
c06b7b0b ILT |
774 | |
775 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 776 | |
c06b7b0b | 777 | void |
a3ad94ed ILT |
778 | add_output_section(Output_section* os, unsigned int type, |
779 | Output_data* od, Address address) | |
780 | { this->add(Output_reloc_type(os, type, od, address)); } | |
5a6f7e2d ILT |
781 | |
782 | void | |
783 | add_output_section(Output_section* os, unsigned int type, | |
784 | Relobj* relobj, unsigned int shndx, Address address) | |
785 | { this->add(Output_reloc_type(os, type, relobj, shndx, address)); } | |
c06b7b0b ILT |
786 | }; |
787 | ||
788 | // The SHT_RELA version of Output_data_reloc. | |
789 | ||
790 | template<bool dynamic, int size, bool big_endian> | |
791 | class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
792 | : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian> | |
793 | { | |
794 | private: | |
795 | typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, | |
796 | big_endian> Base; | |
797 | ||
798 | public: | |
799 | typedef typename Base::Output_reloc_type Output_reloc_type; | |
800 | typedef typename Output_reloc_type::Address Address; | |
801 | typedef typename Output_reloc_type::Addend Addend; | |
802 | ||
803 | Output_data_reloc() | |
804 | : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>() | |
805 | { } | |
806 | ||
807 | // Add a reloc against a global symbol. | |
5a6f7e2d | 808 | |
c06b7b0b | 809 | void |
a3ad94ed ILT |
810 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
811 | Address address, Addend addend) | |
812 | { this->add(Output_reloc_type(gsym, type, od, address, addend)); } | |
c06b7b0b | 813 | |
5a6f7e2d ILT |
814 | void |
815 | add_global(Symbol* gsym, unsigned int type, Relobj* relobj, | |
816 | unsigned int shndx, Address address, Addend addend) | |
817 | { this->add(Output_reloc_type(gsym, type, relobj, shndx, address, addend)); } | |
818 | ||
c06b7b0b | 819 | // Add a reloc against a local symbol. |
5a6f7e2d | 820 | |
c06b7b0b | 821 | void |
5a6f7e2d | 822 | add_local(Sized_relobj<size, big_endian>* relobj, |
c06b7b0b | 823 | unsigned int local_sym_index, unsigned int type, |
a3ad94ed | 824 | Output_data* od, Address address, Addend addend) |
c06b7b0b | 825 | { |
5a6f7e2d ILT |
826 | this->add(Output_reloc_type(relobj, local_sym_index, type, od, address, |
827 | addend)); | |
828 | } | |
829 | ||
830 | void | |
831 | add_local(Sized_relobj<size, big_endian>* relobj, | |
832 | unsigned int local_sym_index, unsigned int type, | |
833 | unsigned int shndx, Address address, Addend addend) | |
834 | { | |
835 | this->add(Output_reloc_type(relobj, local_sym_index, type, shndx, address, | |
c06b7b0b ILT |
836 | addend)); |
837 | } | |
838 | ||
839 | // A reloc against the STT_SECTION symbol of an output section. | |
5a6f7e2d | 840 | |
c06b7b0b | 841 | void |
a3ad94ed ILT |
842 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
843 | Address address, Addend addend) | |
844 | { this->add(Output_reloc_type(os, type, od, address, addend)); } | |
5a6f7e2d ILT |
845 | |
846 | void | |
847 | add_output_section(Output_section* os, unsigned int type, Relobj* relobj, | |
848 | unsigned int shndx, Address address, Addend addend) | |
849 | { this->add(Output_reloc_type(os, type, relobj, shndx, address, addend)); } | |
c06b7b0b ILT |
850 | }; |
851 | ||
dbe717ef ILT |
852 | // Output_data_got is used to manage a GOT. Each entry in the GOT is |
853 | // for one symbol--either a global symbol or a local symbol in an | |
ead1e424 | 854 | // object. The target specific code adds entries to the GOT as |
dbe717ef | 855 | // needed. |
ead1e424 ILT |
856 | |
857 | template<int size, bool big_endian> | |
dbe717ef | 858 | class Output_data_got : public Output_section_data |
ead1e424 ILT |
859 | { |
860 | public: | |
861 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; | |
862 | ||
a3ad94ed | 863 | Output_data_got(const General_options* options) |
ead1e424 | 864 | : Output_section_data(Output_data::default_alignment(size)), |
a3ad94ed | 865 | options_(options), entries_() |
ead1e424 ILT |
866 | { } |
867 | ||
dbe717ef ILT |
868 | // Add an entry for a global symbol to the GOT. Return true if this |
869 | // is a new GOT entry, false if the symbol was already in the GOT. | |
870 | bool | |
871 | add_global(Symbol* gsym); | |
ead1e424 ILT |
872 | |
873 | // Add an entry for a local symbol to the GOT. This returns the | |
874 | // offset of the new entry from the start of the GOT. | |
875 | unsigned int | |
876 | add_local(Object* object, unsigned int sym_index) | |
877 | { | |
878 | this->entries_.push_back(Got_entry(object, sym_index)); | |
879 | this->set_got_size(); | |
880 | return this->last_got_offset(); | |
881 | } | |
882 | ||
883 | // Add a constant to the GOT. This returns the offset of the new | |
884 | // entry from the start of the GOT. | |
885 | unsigned int | |
886 | add_constant(Valtype constant) | |
887 | { | |
888 | this->entries_.push_back(Got_entry(constant)); | |
889 | this->set_got_size(); | |
890 | return this->last_got_offset(); | |
891 | } | |
892 | ||
893 | // Write out the GOT table. | |
894 | void | |
895 | do_write(Output_file*); | |
896 | ||
897 | private: | |
898 | // This POD class holds a single GOT entry. | |
899 | class Got_entry | |
900 | { | |
901 | public: | |
902 | // Create a zero entry. | |
903 | Got_entry() | |
904 | : local_sym_index_(CONSTANT_CODE) | |
905 | { this->u_.constant = 0; } | |
906 | ||
907 | // Create a global symbol entry. | |
a3ad94ed | 908 | explicit Got_entry(Symbol* gsym) |
ead1e424 ILT |
909 | : local_sym_index_(GSYM_CODE) |
910 | { this->u_.gsym = gsym; } | |
911 | ||
912 | // Create a local symbol entry. | |
913 | Got_entry(Object* object, unsigned int local_sym_index) | |
914 | : local_sym_index_(local_sym_index) | |
915 | { | |
a3ad94ed ILT |
916 | gold_assert(local_sym_index != GSYM_CODE |
917 | && local_sym_index != CONSTANT_CODE); | |
ead1e424 ILT |
918 | this->u_.object = object; |
919 | } | |
920 | ||
921 | // Create a constant entry. The constant is a host value--it will | |
922 | // be swapped, if necessary, when it is written out. | |
a3ad94ed | 923 | explicit Got_entry(Valtype constant) |
ead1e424 ILT |
924 | : local_sym_index_(CONSTANT_CODE) |
925 | { this->u_.constant = constant; } | |
926 | ||
927 | // Write the GOT entry to an output view. | |
928 | void | |
a3ad94ed | 929 | write(const General_options*, unsigned char* pov) const; |
ead1e424 ILT |
930 | |
931 | private: | |
932 | enum | |
933 | { | |
934 | GSYM_CODE = -1U, | |
935 | CONSTANT_CODE = -2U | |
936 | }; | |
937 | ||
938 | union | |
939 | { | |
940 | // For a local symbol, the object. | |
941 | Object* object; | |
942 | // For a global symbol, the symbol. | |
943 | Symbol* gsym; | |
944 | // For a constant, the constant. | |
945 | Valtype constant; | |
946 | } u_; | |
c06b7b0b ILT |
947 | // For a local symbol, the local symbol index. This is GSYM_CODE |
948 | // for a global symbol, or CONSTANT_CODE for a constant. | |
ead1e424 ILT |
949 | unsigned int local_sym_index_; |
950 | }; | |
951 | ||
952 | typedef std::vector<Got_entry> Got_entries; | |
953 | ||
954 | // Return the offset into the GOT of GOT entry I. | |
955 | unsigned int | |
956 | got_offset(unsigned int i) const | |
957 | { return i * (size / 8); } | |
958 | ||
959 | // Return the offset into the GOT of the last entry added. | |
960 | unsigned int | |
961 | last_got_offset() const | |
962 | { return this->got_offset(this->entries_.size() - 1); } | |
963 | ||
964 | // Set the size of the section. | |
965 | void | |
966 | set_got_size() | |
967 | { this->set_data_size(this->got_offset(this->entries_.size())); } | |
968 | ||
a3ad94ed ILT |
969 | // Options. |
970 | const General_options* options_; | |
ead1e424 ILT |
971 | // The list of GOT entries. |
972 | Got_entries entries_; | |
973 | }; | |
974 | ||
a3ad94ed ILT |
975 | // Output_data_dynamic is used to hold the data in SHT_DYNAMIC |
976 | // section. | |
977 | ||
978 | class Output_data_dynamic : public Output_section_data | |
979 | { | |
980 | public: | |
981 | Output_data_dynamic(const Target* target, Stringpool* pool) | |
982 | : Output_section_data(Output_data::default_alignment(target->get_size())), | |
983 | target_(target), entries_(), pool_(pool) | |
984 | { } | |
985 | ||
986 | // Add a new dynamic entry with a fixed numeric value. | |
987 | void | |
988 | add_constant(elfcpp::DT tag, unsigned int val) | |
989 | { this->add_entry(Dynamic_entry(tag, val)); } | |
990 | ||
16649710 | 991 | // Add a new dynamic entry with the address of output data. |
a3ad94ed | 992 | void |
16649710 ILT |
993 | add_section_address(elfcpp::DT tag, const Output_data* od) |
994 | { this->add_entry(Dynamic_entry(tag, od, false)); } | |
a3ad94ed | 995 | |
16649710 | 996 | // Add a new dynamic entry with the size of output data. |
a3ad94ed | 997 | void |
16649710 ILT |
998 | add_section_size(elfcpp::DT tag, const Output_data* od) |
999 | { this->add_entry(Dynamic_entry(tag, od, true)); } | |
a3ad94ed ILT |
1000 | |
1001 | // Add a new dynamic entry with the address of a symbol. | |
1002 | void | |
16649710 | 1003 | add_symbol(elfcpp::DT tag, const Symbol* sym) |
a3ad94ed ILT |
1004 | { this->add_entry(Dynamic_entry(tag, sym)); } |
1005 | ||
1006 | // Add a new dynamic entry with a string. | |
1007 | void | |
1008 | add_string(elfcpp::DT tag, const char* str) | |
1009 | { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, NULL))); } | |
1010 | ||
1011 | // Set the final data size. | |
1012 | void | |
1013 | do_set_address(uint64_t, off_t); | |
1014 | ||
1015 | // Write out the dynamic entries. | |
1016 | void | |
1017 | do_write(Output_file*); | |
1018 | ||
16649710 ILT |
1019 | protected: |
1020 | // Adjust the output section to set the entry size. | |
1021 | void | |
1022 | do_adjust_output_section(Output_section*); | |
1023 | ||
a3ad94ed ILT |
1024 | private: |
1025 | // This POD class holds a single dynamic entry. | |
1026 | class Dynamic_entry | |
1027 | { | |
1028 | public: | |
1029 | // Create an entry with a fixed numeric value. | |
1030 | Dynamic_entry(elfcpp::DT tag, unsigned int val) | |
1031 | : tag_(tag), classification_(DYNAMIC_NUMBER) | |
1032 | { this->u_.val = val; } | |
1033 | ||
1034 | // Create an entry with the size or address of a section. | |
16649710 | 1035 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size) |
a3ad94ed ILT |
1036 | : tag_(tag), |
1037 | classification_(section_size | |
1038 | ? DYNAMIC_SECTION_SIZE | |
1039 | : DYNAMIC_SECTION_ADDRESS) | |
16649710 | 1040 | { this->u_.od = od; } |
a3ad94ed ILT |
1041 | |
1042 | // Create an entry with the address of a symbol. | |
16649710 | 1043 | Dynamic_entry(elfcpp::DT tag, const Symbol* sym) |
a3ad94ed ILT |
1044 | : tag_(tag), classification_(DYNAMIC_SYMBOL) |
1045 | { this->u_.sym = sym; } | |
1046 | ||
1047 | // Create an entry with a string. | |
1048 | Dynamic_entry(elfcpp::DT tag, const char* str) | |
1049 | : tag_(tag), classification_(DYNAMIC_STRING) | |
1050 | { this->u_.str = str; } | |
1051 | ||
1052 | // Write the dynamic entry to an output view. | |
1053 | template<int size, bool big_endian> | |
1054 | void | |
1ddbd1e6 | 1055 | write(unsigned char* pov, const Stringpool* ACCEPT_SIZE_ENDIAN) const; |
a3ad94ed ILT |
1056 | |
1057 | private: | |
1058 | enum Classification | |
1059 | { | |
1060 | // Number. | |
1061 | DYNAMIC_NUMBER, | |
1062 | // Section address. | |
1063 | DYNAMIC_SECTION_ADDRESS, | |
1064 | // Section size. | |
1065 | DYNAMIC_SECTION_SIZE, | |
1066 | // Symbol adress. | |
1067 | DYNAMIC_SYMBOL, | |
1068 | // String. | |
1069 | DYNAMIC_STRING | |
1070 | }; | |
1071 | ||
1072 | union | |
1073 | { | |
1074 | // For DYNAMIC_NUMBER. | |
1075 | unsigned int val; | |
1076 | // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE. | |
16649710 | 1077 | const Output_data* od; |
a3ad94ed | 1078 | // For DYNAMIC_SYMBOL. |
16649710 | 1079 | const Symbol* sym; |
a3ad94ed ILT |
1080 | // For DYNAMIC_STRING. |
1081 | const char* str; | |
1082 | } u_; | |
1083 | // The dynamic tag. | |
1084 | elfcpp::DT tag_; | |
1085 | // The type of entry. | |
1086 | Classification classification_; | |
1087 | }; | |
1088 | ||
1089 | // Add an entry to the list. | |
1090 | void | |
1091 | add_entry(const Dynamic_entry& entry) | |
1092 | { this->entries_.push_back(entry); } | |
1093 | ||
1094 | // Sized version of write function. | |
1095 | template<int size, bool big_endian> | |
1096 | void | |
1097 | sized_write(Output_file* of); | |
1098 | ||
1099 | // The type of the list of entries. | |
1100 | typedef std::vector<Dynamic_entry> Dynamic_entries; | |
1101 | ||
1102 | // The target. | |
1103 | const Target* target_; | |
1104 | // The entries. | |
1105 | Dynamic_entries entries_; | |
1106 | // The pool used for strings. | |
1107 | Stringpool* pool_; | |
1108 | }; | |
1109 | ||
a2fb1b05 ILT |
1110 | // An output section. We don't expect to have too many output |
1111 | // sections, so we don't bother to do a template on the size. | |
1112 | ||
54dc6425 | 1113 | class Output_section : public Output_data |
a2fb1b05 ILT |
1114 | { |
1115 | public: | |
1116 | // Create an output section, giving the name, type, and flags. | |
61ba1cf9 | 1117 | Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword, |
ead1e424 | 1118 | bool may_add_data); |
54dc6425 | 1119 | virtual ~Output_section(); |
a2fb1b05 | 1120 | |
ead1e424 ILT |
1121 | // Add a new input section SHNDX, named NAME, with header SHDR, from |
1122 | // object OBJECT. Return the offset within the output section. | |
a2fb1b05 ILT |
1123 | template<int size, bool big_endian> |
1124 | off_t | |
f6ce93d6 | 1125 | add_input_section(Relobj* object, unsigned int shndx, const char *name, |
a2fb1b05 ILT |
1126 | const elfcpp::Shdr<size, big_endian>& shdr); |
1127 | ||
ead1e424 | 1128 | // Add generated data ODATA to this output section. |
c06b7b0b | 1129 | void |
ead1e424 ILT |
1130 | add_output_section_data(Output_section_data* posd); |
1131 | ||
a2fb1b05 ILT |
1132 | // Return the section name. |
1133 | const char* | |
1134 | name() const | |
1135 | { return this->name_; } | |
1136 | ||
1137 | // Return the section type. | |
1138 | elfcpp::Elf_Word | |
1139 | type() const | |
1140 | { return this->type_; } | |
1141 | ||
1142 | // Return the section flags. | |
1143 | elfcpp::Elf_Xword | |
1144 | flags() const | |
1145 | { return this->flags_; } | |
1146 | ||
ead1e424 | 1147 | // Return the section index in the output file. |
61ba1cf9 | 1148 | unsigned int |
ead1e424 ILT |
1149 | do_out_shndx() const |
1150 | { return this->out_shndx_; } | |
1151 | ||
1152 | // Set the output section index. | |
1153 | void | |
1154 | do_set_out_shndx(unsigned int shndx) | |
1155 | { this->out_shndx_ = shndx; } | |
61ba1cf9 | 1156 | |
a3ad94ed ILT |
1157 | // Return the entsize field. |
1158 | uint64_t | |
1159 | entsize() const | |
1160 | { return this->entsize_; } | |
1161 | ||
61ba1cf9 ILT |
1162 | // Set the entsize field. |
1163 | void | |
16649710 | 1164 | set_entsize(uint64_t v); |
61ba1cf9 | 1165 | |
16649710 ILT |
1166 | // Set the link field to the output section index of a section. |
1167 | void | |
14b31740 | 1168 | set_link_section(const Output_data* od) |
16649710 ILT |
1169 | { |
1170 | gold_assert(this->link_ == 0 | |
1171 | && !this->should_link_to_symtab_ | |
1172 | && !this->should_link_to_dynsym_); | |
1173 | this->link_section_ = od; | |
1174 | } | |
1175 | ||
1176 | // Set the link field to a constant. | |
61ba1cf9 ILT |
1177 | void |
1178 | set_link(unsigned int v) | |
16649710 ILT |
1179 | { |
1180 | gold_assert(this->link_section_ == NULL | |
1181 | && !this->should_link_to_symtab_ | |
1182 | && !this->should_link_to_dynsym_); | |
1183 | this->link_ = v; | |
1184 | } | |
61ba1cf9 | 1185 | |
16649710 ILT |
1186 | // Record that this section should link to the normal symbol table. |
1187 | void | |
1188 | set_should_link_to_symtab() | |
1189 | { | |
1190 | gold_assert(this->link_section_ == NULL | |
1191 | && this->link_ == 0 | |
1192 | && !this->should_link_to_dynsym_); | |
1193 | this->should_link_to_symtab_ = true; | |
1194 | } | |
1195 | ||
1196 | // Record that this section should link to the dynamic symbol table. | |
1197 | void | |
1198 | set_should_link_to_dynsym() | |
1199 | { | |
1200 | gold_assert(this->link_section_ == NULL | |
1201 | && this->link_ == 0 | |
1202 | && !this->should_link_to_symtab_); | |
1203 | this->should_link_to_dynsym_ = true; | |
1204 | } | |
1205 | ||
1206 | // Return the info field. | |
1207 | unsigned int | |
1208 | info() const | |
1209 | { | |
1210 | gold_assert(this->info_section_ == NULL); | |
1211 | return this->info_; | |
1212 | } | |
1213 | ||
1214 | // Set the info field to the output section index of a section. | |
1215 | void | |
14b31740 | 1216 | set_info_section(const Output_data* od) |
16649710 ILT |
1217 | { |
1218 | gold_assert(this->info_ == 0); | |
1219 | this->info_section_ = od; | |
1220 | } | |
1221 | ||
1222 | // Set the info field to a constant. | |
61ba1cf9 ILT |
1223 | void |
1224 | set_info(unsigned int v) | |
16649710 ILT |
1225 | { |
1226 | gold_assert(this->info_section_ == NULL); | |
1227 | this->info_ = v; | |
1228 | } | |
61ba1cf9 ILT |
1229 | |
1230 | // Set the addralign field. | |
1231 | void | |
1232 | set_addralign(uint64_t v) | |
1233 | { this->addralign_ = v; } | |
1234 | ||
c06b7b0b ILT |
1235 | // Indicate that we need a symtab index. |
1236 | void | |
1237 | set_needs_symtab_index() | |
1238 | { this->needs_symtab_index_ = true; } | |
1239 | ||
1240 | // Return whether we need a symtab index. | |
1241 | bool | |
1242 | needs_symtab_index() const | |
1243 | { return this->needs_symtab_index_; } | |
1244 | ||
1245 | // Get the symtab index. | |
1246 | unsigned int | |
1247 | symtab_index() const | |
1248 | { | |
a3ad94ed | 1249 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
1250 | return this->symtab_index_; |
1251 | } | |
1252 | ||
1253 | // Set the symtab index. | |
1254 | void | |
1255 | set_symtab_index(unsigned int index) | |
1256 | { | |
a3ad94ed | 1257 | gold_assert(index != 0); |
c06b7b0b ILT |
1258 | this->symtab_index_ = index; |
1259 | } | |
1260 | ||
1261 | // Indicate that we need a dynsym index. | |
1262 | void | |
1263 | set_needs_dynsym_index() | |
1264 | { this->needs_dynsym_index_ = true; } | |
1265 | ||
1266 | // Return whether we need a dynsym index. | |
1267 | bool | |
1268 | needs_dynsym_index() const | |
1269 | { return this->needs_dynsym_index_; } | |
1270 | ||
1271 | // Get the dynsym index. | |
1272 | unsigned int | |
1273 | dynsym_index() const | |
1274 | { | |
a3ad94ed | 1275 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
1276 | return this->dynsym_index_; |
1277 | } | |
1278 | ||
1279 | // Set the dynsym index. | |
1280 | void | |
1281 | set_dynsym_index(unsigned int index) | |
1282 | { | |
a3ad94ed | 1283 | gold_assert(index != 0); |
c06b7b0b ILT |
1284 | this->dynsym_index_ = index; |
1285 | } | |
1286 | ||
ead1e424 ILT |
1287 | // Set the address of the Output_section. For a typical |
1288 | // Output_section, there is nothing to do, but if there are any | |
1289 | // Output_section_data objects we need to set the final addresses | |
1290 | // here. | |
1291 | void | |
1292 | do_set_address(uint64_t, off_t); | |
1293 | ||
54dc6425 | 1294 | // Write the data to the file. For a typical Output_section, this |
ead1e424 ILT |
1295 | // does nothing: the data is written out by calling Object::Relocate |
1296 | // on each input object. But if there are any Output_section_data | |
1297 | // objects we do need to write them out here. | |
a3ad94ed | 1298 | void |
ead1e424 | 1299 | do_write(Output_file*); |
54dc6425 | 1300 | |
75f65a3e ILT |
1301 | // Return the address alignment--function required by parent class. |
1302 | uint64_t | |
1303 | do_addralign() const | |
1304 | { return this->addralign_; } | |
1305 | ||
1306 | // Return whether this is an Output_section. | |
1307 | bool | |
1308 | do_is_section() const | |
1309 | { return true; } | |
1310 | ||
54dc6425 ILT |
1311 | // Return whether this is a section of the specified type. |
1312 | bool | |
75f65a3e | 1313 | do_is_section_type(elfcpp::Elf_Word type) const |
54dc6425 ILT |
1314 | { return this->type_ == type; } |
1315 | ||
1316 | // Return whether the specified section flag is set. | |
1317 | bool | |
75f65a3e | 1318 | do_is_section_flag_set(elfcpp::Elf_Xword flag) const |
54dc6425 ILT |
1319 | { return (this->flags_ & flag) != 0; } |
1320 | ||
61ba1cf9 ILT |
1321 | // Write the section header into *OPHDR. |
1322 | template<int size, bool big_endian> | |
1323 | void | |
16649710 ILT |
1324 | write_header(const Layout*, const Stringpool*, |
1325 | elfcpp::Shdr_write<size, big_endian>*) const; | |
61ba1cf9 | 1326 | |
a2fb1b05 | 1327 | private: |
ead1e424 ILT |
1328 | // In some cases we need to keep a list of the input sections |
1329 | // associated with this output section. We only need the list if we | |
1330 | // might have to change the offsets of the input section within the | |
1331 | // output section after we add the input section. The ordinary | |
1332 | // input sections will be written out when we process the object | |
1333 | // file, and as such we don't need to track them here. We do need | |
1334 | // to track Output_section_data objects here. We store instances of | |
1335 | // this structure in a std::vector, so it must be a POD. There can | |
1336 | // be many instances of this structure, so we use a union to save | |
1337 | // some space. | |
1338 | class Input_section | |
1339 | { | |
1340 | public: | |
1341 | Input_section() | |
1342 | : shndx_(0), p2align_(0), data_size_(0) | |
1343 | { this->u_.object = NULL; } | |
1344 | ||
f6ce93d6 | 1345 | Input_section(Relobj* object, unsigned int shndx, off_t data_size, |
ead1e424 ILT |
1346 | uint64_t addralign) |
1347 | : shndx_(shndx), | |
1348 | p2align_(ffsll(static_cast<long long>(addralign))), | |
1349 | data_size_(data_size) | |
1350 | { | |
a3ad94ed | 1351 | gold_assert(shndx != -1U); |
ead1e424 ILT |
1352 | this->u_.object = object; |
1353 | } | |
1354 | ||
1355 | Input_section(Output_section_data* posd) | |
1356 | : shndx_(-1U), | |
1357 | p2align_(ffsll(static_cast<long long>(posd->addralign()))), | |
1358 | data_size_(0) | |
1359 | { this->u_.posd = posd; } | |
1360 | ||
1361 | // The required alignment. | |
1362 | uint64_t | |
1363 | addralign() const | |
a3ad94ed ILT |
1364 | { |
1365 | return (this->p2align_ == 0 | |
1366 | ? 0 | |
1367 | : static_cast<uint64_t>(1) << (this->p2align_ - 1)); | |
1368 | } | |
ead1e424 ILT |
1369 | |
1370 | // Return the required size. | |
1371 | off_t | |
1372 | data_size() const; | |
1373 | ||
1374 | // Set the address and file offset. This is called during | |
1375 | // Layout::finalize. SECOFF is the file offset of the enclosing | |
1376 | // section. | |
1377 | void | |
1378 | set_address(uint64_t addr, off_t off, off_t secoff); | |
1379 | ||
1380 | // Write out the data. This does nothing for an input section. | |
1381 | void | |
1382 | write(Output_file*); | |
1383 | ||
1384 | private: | |
1385 | // Whether this is an input section. | |
1386 | bool | |
1387 | is_input_section() const | |
1388 | { return this->shndx_ != -1U; } | |
1389 | ||
1390 | // For an ordinary input section, this is the section index in | |
1391 | // the input file. For an Output_section_data, this is -1U. | |
1392 | unsigned int shndx_; | |
1393 | // The required alignment, stored as a power of 2. | |
1394 | unsigned int p2align_; | |
1395 | // For an ordinary input section, the section size. | |
1396 | off_t data_size_; | |
1397 | union | |
1398 | { | |
1399 | // If shndx_ != -1U, this points to the object which holds the | |
1400 | // input section. | |
f6ce93d6 | 1401 | Relobj* object; |
ead1e424 ILT |
1402 | // If shndx_ == -1U, this is the data to write out. |
1403 | Output_section_data* posd; | |
1404 | } u_; | |
1405 | }; | |
1406 | ||
1407 | typedef std::vector<Input_section> Input_section_list; | |
1408 | ||
a2fb1b05 ILT |
1409 | // Most of these fields are only valid after layout. |
1410 | ||
1411 | // The name of the section. This will point into a Stringpool. | |
1412 | const char* name_; | |
75f65a3e | 1413 | // The section address is in the parent class. |
a2fb1b05 ILT |
1414 | // The section alignment. |
1415 | uint64_t addralign_; | |
1416 | // The section entry size. | |
1417 | uint64_t entsize_; | |
75f65a3e | 1418 | // The file offset is in the parent class. |
16649710 | 1419 | // Set the section link field to the index of this section. |
14b31740 | 1420 | const Output_data* link_section_; |
16649710 | 1421 | // If link_section_ is NULL, this is the link field. |
a2fb1b05 | 1422 | unsigned int link_; |
16649710 | 1423 | // Set the section info field to the index of this section. |
14b31740 | 1424 | const Output_data* info_section_; |
16649710 | 1425 | // If info_section_ is NULL, this is the section info field. |
a2fb1b05 ILT |
1426 | unsigned int info_; |
1427 | // The section type. | |
1428 | elfcpp::Elf_Word type_; | |
1429 | // The section flags. | |
1430 | elfcpp::Elf_Xword flags_; | |
61ba1cf9 | 1431 | // The section index. |
ead1e424 | 1432 | unsigned int out_shndx_; |
c06b7b0b ILT |
1433 | // If there is a STT_SECTION for this output section in the normal |
1434 | // symbol table, this is the symbol index. This starts out as zero. | |
1435 | // It is initialized in Layout::finalize() to be the index, or -1U | |
1436 | // if there isn't one. | |
1437 | unsigned int symtab_index_; | |
1438 | // If there is a STT_SECTION for this output section in the dynamic | |
1439 | // symbol table, this is the symbol index. This starts out as zero. | |
1440 | // It is initialized in Layout::finalize() to be the index, or -1U | |
1441 | // if there isn't one. | |
1442 | unsigned int dynsym_index_; | |
ead1e424 ILT |
1443 | // The input sections. This will be empty in cases where we don't |
1444 | // need to keep track of them. | |
1445 | Input_section_list input_sections_; | |
1446 | // The offset of the first entry in input_sections_. | |
1447 | off_t first_input_offset_; | |
1448 | // Whether we permit adding data. | |
c06b7b0b ILT |
1449 | bool may_add_data_ : 1; |
1450 | // Whether this output section needs a STT_SECTION symbol in the | |
1451 | // normal symbol table. This will be true if there is a relocation | |
1452 | // which needs it. | |
1453 | bool needs_symtab_index_ : 1; | |
1454 | // Whether this output section needs a STT_SECTION symbol in the | |
1455 | // dynamic symbol table. This will be true if there is a dynamic | |
1456 | // relocation which needs it. | |
1457 | bool needs_dynsym_index_ : 1; | |
16649710 ILT |
1458 | // Whether the link field of this output section should point to the |
1459 | // normal symbol table. | |
1460 | bool should_link_to_symtab_ : 1; | |
1461 | // Whether the link field of this output section should point to the | |
1462 | // dynamic symbol table. | |
1463 | bool should_link_to_dynsym_ : 1; | |
a2fb1b05 ILT |
1464 | }; |
1465 | ||
1466 | // An output segment. PT_LOAD segments are built from collections of | |
1467 | // output sections. Other segments typically point within PT_LOAD | |
1468 | // segments, and are built directly as needed. | |
1469 | ||
1470 | class Output_segment | |
1471 | { | |
1472 | public: | |
1473 | // Create an output segment, specifying the type and flags. | |
1474 | Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word); | |
1475 | ||
1476 | // Return the virtual address. | |
1477 | uint64_t | |
1478 | vaddr() const | |
1479 | { return this->vaddr_; } | |
1480 | ||
1481 | // Return the physical address. | |
1482 | uint64_t | |
1483 | paddr() const | |
1484 | { return this->paddr_; } | |
1485 | ||
1486 | // Return the segment type. | |
1487 | elfcpp::Elf_Word | |
1488 | type() const | |
1489 | { return this->type_; } | |
1490 | ||
1491 | // Return the segment flags. | |
1492 | elfcpp::Elf_Word | |
1493 | flags() const | |
1494 | { return this->flags_; } | |
1495 | ||
92e059d8 ILT |
1496 | // Return the memory size. |
1497 | uint64_t | |
1498 | memsz() const | |
1499 | { return this->memsz_; } | |
1500 | ||
ead1e424 ILT |
1501 | // Return the file size. |
1502 | off_t | |
1503 | filesz() const | |
1504 | { return this->filesz_; } | |
1505 | ||
75f65a3e ILT |
1506 | // Return the maximum alignment of the Output_data. |
1507 | uint64_t | |
ead1e424 | 1508 | addralign(); |
75f65a3e | 1509 | |
a2fb1b05 ILT |
1510 | // Add an Output_section to this segment. |
1511 | void | |
dbe717ef ILT |
1512 | add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) |
1513 | { this->add_output_section(os, seg_flags, false); } | |
1514 | ||
1515 | // Add an Output_section to the start of this segment. | |
1516 | void | |
1517 | add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) | |
1518 | { this->add_output_section(os, seg_flags, true); } | |
75f65a3e ILT |
1519 | |
1520 | // Add an Output_data (which is not an Output_section) to the start | |
1521 | // of this segment. | |
1522 | void | |
1523 | add_initial_output_data(Output_data*); | |
1524 | ||
1525 | // Set the address of the segment to ADDR and the offset to *POFF | |
1526 | // (aligned if necessary), and set the addresses and offsets of all | |
ead1e424 ILT |
1527 | // contained output sections accordingly. Set the section indexes |
1528 | // of all contained output sections starting with *PSHNDX. Return | |
1529 | // the address of the immediately following segment. Update *POFF | |
1530 | // and *PSHNDX. This should only be called for a PT_LOAD segment. | |
75f65a3e | 1531 | uint64_t |
ead1e424 | 1532 | set_section_addresses(uint64_t addr, off_t* poff, unsigned int* pshndx); |
75f65a3e ILT |
1533 | |
1534 | // Set the offset of this segment based on the section. This should | |
1535 | // only be called for a non-PT_LOAD segment. | |
1536 | void | |
1537 | set_offset(); | |
1538 | ||
1539 | // Return the number of output sections. | |
1540 | unsigned int | |
1541 | output_section_count() const; | |
a2fb1b05 | 1542 | |
61ba1cf9 ILT |
1543 | // Write the segment header into *OPHDR. |
1544 | template<int size, bool big_endian> | |
1545 | void | |
ead1e424 | 1546 | write_header(elfcpp::Phdr_write<size, big_endian>*); |
61ba1cf9 ILT |
1547 | |
1548 | // Write the section headers of associated sections into V. | |
1549 | template<int size, bool big_endian> | |
1550 | unsigned char* | |
16649710 | 1551 | write_section_headers(const Layout*, const Stringpool*, unsigned char* v, |
ead1e424 | 1552 | unsigned int* pshndx ACCEPT_SIZE_ENDIAN) const; |
61ba1cf9 | 1553 | |
a2fb1b05 ILT |
1554 | private: |
1555 | Output_segment(const Output_segment&); | |
1556 | Output_segment& operator=(const Output_segment&); | |
1557 | ||
54dc6425 | 1558 | typedef std::list<Output_data*> Output_data_list; |
a2fb1b05 | 1559 | |
dbe717ef ILT |
1560 | // Add an Output_section to this segment, specifying front or back. |
1561 | void | |
1562 | add_output_section(Output_section*, elfcpp::Elf_Word seg_flags, | |
1563 | bool front); | |
1564 | ||
ead1e424 ILT |
1565 | // Find the maximum alignment in an Output_data_list. |
1566 | static uint64_t | |
1567 | maximum_alignment(const Output_data_list*); | |
1568 | ||
75f65a3e ILT |
1569 | // Set the section addresses in an Output_data_list. |
1570 | uint64_t | |
ead1e424 ILT |
1571 | set_section_list_addresses(Output_data_list*, uint64_t addr, off_t* poff, |
1572 | unsigned int* pshndx); | |
75f65a3e ILT |
1573 | |
1574 | // Return the number of Output_sections in an Output_data_list. | |
1575 | unsigned int | |
1576 | output_section_count_list(const Output_data_list*) const; | |
1577 | ||
61ba1cf9 ILT |
1578 | // Write the section headers in the list into V. |
1579 | template<int size, bool big_endian> | |
1580 | unsigned char* | |
16649710 ILT |
1581 | write_section_headers_list(const Layout*, const Stringpool*, |
1582 | const Output_data_list*, unsigned char* v, | |
ead1e424 | 1583 | unsigned int* pshdx ACCEPT_SIZE_ENDIAN) const; |
61ba1cf9 | 1584 | |
75f65a3e | 1585 | // The list of output data with contents attached to this segment. |
54dc6425 | 1586 | Output_data_list output_data_; |
75f65a3e ILT |
1587 | // The list of output data without contents attached to this segment. |
1588 | Output_data_list output_bss_; | |
a2fb1b05 ILT |
1589 | // The segment virtual address. |
1590 | uint64_t vaddr_; | |
1591 | // The segment physical address. | |
1592 | uint64_t paddr_; | |
1593 | // The size of the segment in memory. | |
1594 | uint64_t memsz_; | |
1595 | // The segment alignment. | |
1596 | uint64_t align_; | |
1597 | // The offset of the segment data within the file. | |
1598 | off_t offset_; | |
1599 | // The size of the segment data in the file. | |
1600 | off_t filesz_; | |
1601 | // The segment type; | |
1602 | elfcpp::Elf_Word type_; | |
1603 | // The segment flags. | |
1604 | elfcpp::Elf_Word flags_; | |
ead1e424 ILT |
1605 | // Whether we have set align_. |
1606 | bool is_align_known_; | |
a2fb1b05 ILT |
1607 | }; |
1608 | ||
61ba1cf9 | 1609 | // This class represents the output file. |
a2fb1b05 ILT |
1610 | |
1611 | class Output_file | |
1612 | { | |
1613 | public: | |
61ba1cf9 ILT |
1614 | Output_file(const General_options& options); |
1615 | ||
1616 | // Open the output file. FILE_SIZE is the final size of the file. | |
1617 | void | |
1618 | open(off_t file_size); | |
1619 | ||
1620 | // Close the output file and make sure there are no error. | |
1621 | void | |
1622 | close(); | |
1623 | ||
1624 | // We currently always use mmap which makes the view handling quite | |
1625 | // simple. In the future we may support other approaches. | |
a2fb1b05 ILT |
1626 | |
1627 | // Write data to the output file. | |
1628 | void | |
61ba1cf9 ILT |
1629 | write(off_t offset, const void* data, off_t len) |
1630 | { memcpy(this->base_ + offset, data, len); } | |
1631 | ||
1632 | // Get a buffer to use to write to the file, given the offset into | |
1633 | // the file and the size. | |
1634 | unsigned char* | |
1635 | get_output_view(off_t start, off_t size) | |
1636 | { | |
a3ad94ed | 1637 | gold_assert(start >= 0 && size >= 0 && start + size <= this->file_size_); |
61ba1cf9 ILT |
1638 | return this->base_ + start; |
1639 | } | |
1640 | ||
1641 | // VIEW must have been returned by get_output_view. Write the | |
1642 | // buffer to the file, passing in the offset and the size. | |
1643 | void | |
1644 | write_output_view(off_t, off_t, unsigned char*) | |
1645 | { } | |
1646 | ||
1647 | private: | |
1648 | // General options. | |
1649 | const General_options& options_; | |
1650 | // File name. | |
1651 | const char* name_; | |
1652 | // File descriptor. | |
1653 | int o_; | |
1654 | // File size. | |
1655 | off_t file_size_; | |
1656 | // Base of file mapped into memory. | |
1657 | unsigned char* base_; | |
a2fb1b05 ILT |
1658 | }; |
1659 | ||
1660 | } // End namespace gold. | |
1661 | ||
1662 | #endif // !defined(GOLD_OUTPUT_H) |