Commit | Line | Data |
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a2fb1b05 ILT |
1 | // output.cc -- manage the output file for gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include <cstdlib> | |
61ba1cf9 ILT |
6 | #include <cerrno> |
7 | #include <fcntl.h> | |
8 | #include <unistd.h> | |
9 | #include <sys/mman.h> | |
75f65a3e | 10 | #include <algorithm> |
a2fb1b05 ILT |
11 | |
12 | #include "object.h" | |
ead1e424 ILT |
13 | #include "symtab.h" |
14 | #include "reloc.h" | |
a2fb1b05 ILT |
15 | #include "output.h" |
16 | ||
17 | namespace gold | |
18 | { | |
19 | ||
20 | // Output_data methods. | |
21 | ||
22 | Output_data::~Output_data() | |
23 | { | |
24 | } | |
25 | ||
75f65a3e ILT |
26 | // Set the address and offset. |
27 | ||
28 | void | |
29 | Output_data::set_address(uint64_t addr, off_t off) | |
30 | { | |
31 | this->address_ = addr; | |
32 | this->offset_ = off; | |
33 | ||
34 | // Let the child class know. | |
35 | this->do_set_address(addr, off); | |
36 | } | |
37 | ||
38 | // Return the default alignment for a size--32 or 64. | |
39 | ||
40 | uint64_t | |
41 | Output_data::default_alignment(int size) | |
42 | { | |
43 | if (size == 32) | |
44 | return 4; | |
45 | else if (size == 64) | |
46 | return 8; | |
47 | else | |
48 | abort(); | |
49 | } | |
50 | ||
a2fb1b05 ILT |
51 | // Output_data_const methods. |
52 | ||
53 | void | |
75f65a3e ILT |
54 | Output_data_const::do_write(Output_file* output) |
55 | { | |
56 | output->write(this->offset(), data_.data(), data_.size()); | |
57 | } | |
58 | ||
59 | // Output_section_header methods. This currently assumes that the | |
60 | // segment and section lists are complete at construction time. | |
61 | ||
62 | Output_section_headers::Output_section_headers( | |
63 | int size, | |
61ba1cf9 | 64 | bool big_endian, |
75f65a3e | 65 | const Layout::Segment_list& segment_list, |
61ba1cf9 ILT |
66 | const Layout::Section_list& section_list, |
67 | const Stringpool* secnamepool) | |
75f65a3e | 68 | : size_(size), |
61ba1cf9 | 69 | big_endian_(big_endian), |
75f65a3e | 70 | segment_list_(segment_list), |
61ba1cf9 ILT |
71 | section_list_(section_list), |
72 | secnamepool_(secnamepool) | |
75f65a3e | 73 | { |
61ba1cf9 ILT |
74 | // Count all the sections. Start with 1 for the null section. |
75 | off_t count = 1; | |
75f65a3e ILT |
76 | for (Layout::Segment_list::const_iterator p = segment_list.begin(); |
77 | p != segment_list.end(); | |
78 | ++p) | |
ead1e424 ILT |
79 | if ((*p)->type() == elfcpp::PT_LOAD) |
80 | count += (*p)->output_section_count(); | |
75f65a3e ILT |
81 | count += section_list.size(); |
82 | ||
83 | int shdr_size; | |
84 | if (size == 32) | |
85 | shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
86 | else if (size == 64) | |
87 | shdr_size = elfcpp::Elf_sizes<64>::shdr_size; | |
88 | else | |
89 | abort(); | |
90 | ||
91 | this->set_data_size(count * shdr_size); | |
92 | } | |
93 | ||
61ba1cf9 ILT |
94 | // Write out the section headers. |
95 | ||
75f65a3e | 96 | void |
61ba1cf9 | 97 | Output_section_headers::do_write(Output_file* of) |
a2fb1b05 | 98 | { |
61ba1cf9 ILT |
99 | if (this->size_ == 32) |
100 | { | |
101 | if (this->big_endian_) | |
102 | this->do_sized_write<32, true>(of); | |
103 | else | |
104 | this->do_sized_write<32, false>(of); | |
105 | } | |
106 | else if (this->size_ == 64) | |
107 | { | |
108 | if (this->big_endian_) | |
109 | this->do_sized_write<64, true>(of); | |
110 | else | |
111 | this->do_sized_write<64, false>(of); | |
112 | } | |
113 | else | |
114 | abort(); | |
115 | } | |
116 | ||
117 | template<int size, bool big_endian> | |
118 | void | |
119 | Output_section_headers::do_sized_write(Output_file* of) | |
120 | { | |
121 | off_t all_shdrs_size = this->data_size(); | |
122 | unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size); | |
123 | ||
124 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
125 | unsigned char* v = view; | |
126 | ||
127 | { | |
128 | typename elfcpp::Shdr_write<size, big_endian> oshdr(v); | |
129 | oshdr.put_sh_name(0); | |
130 | oshdr.put_sh_type(elfcpp::SHT_NULL); | |
131 | oshdr.put_sh_flags(0); | |
132 | oshdr.put_sh_addr(0); | |
133 | oshdr.put_sh_offset(0); | |
134 | oshdr.put_sh_size(0); | |
135 | oshdr.put_sh_link(0); | |
136 | oshdr.put_sh_info(0); | |
137 | oshdr.put_sh_addralign(0); | |
138 | oshdr.put_sh_entsize(0); | |
139 | } | |
140 | ||
141 | v += shdr_size; | |
142 | ||
ead1e424 | 143 | unsigned shndx = 1; |
61ba1cf9 ILT |
144 | for (Layout::Segment_list::const_iterator p = this->segment_list_.begin(); |
145 | p != this->segment_list_.end(); | |
146 | ++p) | |
593f47df | 147 | v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
ead1e424 ILT |
148 | this->secnamepool_, v, &shndx |
149 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
61ba1cf9 ILT |
150 | for (Layout::Section_list::const_iterator p = this->section_list_.begin(); |
151 | p != this->section_list_.end(); | |
152 | ++p) | |
153 | { | |
ead1e424 | 154 | assert(shndx == (*p)->out_shndx()); |
61ba1cf9 ILT |
155 | elfcpp::Shdr_write<size, big_endian> oshdr(v); |
156 | (*p)->write_header(this->secnamepool_, &oshdr); | |
157 | v += shdr_size; | |
ead1e424 | 158 | ++shndx; |
61ba1cf9 ILT |
159 | } |
160 | ||
161 | of->write_output_view(this->offset(), all_shdrs_size, view); | |
a2fb1b05 ILT |
162 | } |
163 | ||
54dc6425 ILT |
164 | // Output_segment_header methods. |
165 | ||
61ba1cf9 ILT |
166 | Output_segment_headers::Output_segment_headers( |
167 | int size, | |
168 | bool big_endian, | |
169 | const Layout::Segment_list& segment_list) | |
170 | : size_(size), big_endian_(big_endian), segment_list_(segment_list) | |
171 | { | |
172 | int phdr_size; | |
173 | if (size == 32) | |
174 | phdr_size = elfcpp::Elf_sizes<32>::phdr_size; | |
175 | else if (size == 64) | |
176 | phdr_size = elfcpp::Elf_sizes<64>::phdr_size; | |
177 | else | |
178 | abort(); | |
179 | ||
180 | this->set_data_size(segment_list.size() * phdr_size); | |
181 | } | |
182 | ||
54dc6425 | 183 | void |
61ba1cf9 | 184 | Output_segment_headers::do_write(Output_file* of) |
75f65a3e | 185 | { |
61ba1cf9 ILT |
186 | if (this->size_ == 32) |
187 | { | |
188 | if (this->big_endian_) | |
189 | this->do_sized_write<32, true>(of); | |
190 | else | |
191 | this->do_sized_write<32, false>(of); | |
192 | } | |
193 | else if (this->size_ == 64) | |
194 | { | |
195 | if (this->big_endian_) | |
196 | this->do_sized_write<64, true>(of); | |
197 | else | |
198 | this->do_sized_write<64, false>(of); | |
199 | } | |
200 | else | |
201 | abort(); | |
202 | } | |
203 | ||
204 | template<int size, bool big_endian> | |
205 | void | |
206 | Output_segment_headers::do_sized_write(Output_file* of) | |
207 | { | |
208 | const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size; | |
209 | off_t all_phdrs_size = this->segment_list_.size() * phdr_size; | |
210 | unsigned char* view = of->get_output_view(this->offset(), | |
211 | all_phdrs_size); | |
212 | unsigned char* v = view; | |
213 | for (Layout::Segment_list::const_iterator p = this->segment_list_.begin(); | |
214 | p != this->segment_list_.end(); | |
215 | ++p) | |
216 | { | |
217 | elfcpp::Phdr_write<size, big_endian> ophdr(v); | |
218 | (*p)->write_header(&ophdr); | |
219 | v += phdr_size; | |
220 | } | |
221 | ||
222 | of->write_output_view(this->offset(), all_phdrs_size, view); | |
75f65a3e ILT |
223 | } |
224 | ||
225 | // Output_file_header methods. | |
226 | ||
227 | Output_file_header::Output_file_header(int size, | |
61ba1cf9 | 228 | bool big_endian, |
75f65a3e ILT |
229 | const General_options& options, |
230 | const Target* target, | |
231 | const Symbol_table* symtab, | |
232 | const Output_segment_headers* osh) | |
233 | : size_(size), | |
61ba1cf9 | 234 | big_endian_(big_endian), |
75f65a3e ILT |
235 | options_(options), |
236 | target_(target), | |
237 | symtab_(symtab), | |
61ba1cf9 | 238 | segment_header_(osh), |
75f65a3e ILT |
239 | section_header_(NULL), |
240 | shstrtab_(NULL) | |
241 | { | |
61ba1cf9 ILT |
242 | int ehdr_size; |
243 | if (size == 32) | |
244 | ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size; | |
245 | else if (size == 64) | |
246 | ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
247 | else | |
248 | abort(); | |
249 | ||
250 | this->set_data_size(ehdr_size); | |
75f65a3e ILT |
251 | } |
252 | ||
253 | // Set the section table information for a file header. | |
254 | ||
255 | void | |
256 | Output_file_header::set_section_info(const Output_section_headers* shdrs, | |
257 | const Output_section* shstrtab) | |
258 | { | |
259 | this->section_header_ = shdrs; | |
260 | this->shstrtab_ = shstrtab; | |
261 | } | |
262 | ||
263 | // Write out the file header. | |
264 | ||
265 | void | |
61ba1cf9 | 266 | Output_file_header::do_write(Output_file* of) |
54dc6425 | 267 | { |
61ba1cf9 ILT |
268 | if (this->size_ == 32) |
269 | { | |
270 | if (this->big_endian_) | |
271 | this->do_sized_write<32, true>(of); | |
272 | else | |
273 | this->do_sized_write<32, false>(of); | |
274 | } | |
275 | else if (this->size_ == 64) | |
276 | { | |
277 | if (this->big_endian_) | |
278 | this->do_sized_write<64, true>(of); | |
279 | else | |
280 | this->do_sized_write<64, false>(of); | |
281 | } | |
282 | else | |
283 | abort(); | |
284 | } | |
285 | ||
286 | // Write out the file header with appropriate size and endianess. | |
287 | ||
288 | template<int size, bool big_endian> | |
289 | void | |
290 | Output_file_header::do_sized_write(Output_file* of) | |
291 | { | |
292 | assert(this->offset() == 0); | |
293 | ||
294 | int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; | |
295 | unsigned char* view = of->get_output_view(0, ehdr_size); | |
296 | elfcpp::Ehdr_write<size, big_endian> oehdr(view); | |
297 | ||
298 | unsigned char e_ident[elfcpp::EI_NIDENT]; | |
299 | memset(e_ident, 0, elfcpp::EI_NIDENT); | |
300 | e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0; | |
301 | e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1; | |
302 | e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2; | |
303 | e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3; | |
304 | if (size == 32) | |
305 | e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32; | |
306 | else if (size == 64) | |
307 | e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64; | |
308 | else | |
309 | abort(); | |
310 | e_ident[elfcpp::EI_DATA] = (big_endian | |
311 | ? elfcpp::ELFDATA2MSB | |
312 | : elfcpp::ELFDATA2LSB); | |
313 | e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT; | |
314 | // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION. | |
315 | oehdr.put_e_ident(e_ident); | |
316 | ||
317 | elfcpp::ET e_type; | |
318 | // FIXME: ET_DYN. | |
319 | if (this->options_.is_relocatable()) | |
320 | e_type = elfcpp::ET_REL; | |
321 | else | |
322 | e_type = elfcpp::ET_EXEC; | |
323 | oehdr.put_e_type(e_type); | |
324 | ||
325 | oehdr.put_e_machine(this->target_->machine_code()); | |
326 | oehdr.put_e_version(elfcpp::EV_CURRENT); | |
327 | ||
ead1e424 | 328 | // FIXME: Need to support -e, and target specific entry symbol. |
61ba1cf9 ILT |
329 | Symbol* sym = this->symtab_->lookup("_start"); |
330 | typename Sized_symbol<size>::Value_type v; | |
331 | if (sym == NULL) | |
332 | v = 0; | |
333 | else | |
334 | { | |
335 | Sized_symbol<size>* ssym; | |
593f47df | 336 | ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) ( |
5482377d | 337 | sym SELECT_SIZE(size)); |
61ba1cf9 ILT |
338 | v = ssym->value(); |
339 | } | |
340 | oehdr.put_e_entry(v); | |
341 | ||
342 | oehdr.put_e_phoff(this->segment_header_->offset()); | |
343 | oehdr.put_e_shoff(this->section_header_->offset()); | |
344 | ||
345 | // FIXME: The target needs to set the flags. | |
346 | oehdr.put_e_flags(0); | |
347 | ||
348 | oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size); | |
349 | oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size); | |
350 | oehdr.put_e_phnum(this->segment_header_->data_size() | |
351 | / elfcpp::Elf_sizes<size>::phdr_size); | |
352 | oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size); | |
353 | oehdr.put_e_shnum(this->section_header_->data_size() | |
354 | / elfcpp::Elf_sizes<size>::shdr_size); | |
ead1e424 | 355 | oehdr.put_e_shstrndx(this->shstrtab_->out_shndx()); |
61ba1cf9 ILT |
356 | |
357 | of->write_output_view(0, ehdr_size, view); | |
54dc6425 ILT |
358 | } |
359 | ||
ead1e424 ILT |
360 | // Output_section_got::Got_entry methods. |
361 | ||
362 | // Write out the entry. | |
363 | ||
364 | template<int size, bool big_endian> | |
365 | void | |
366 | Output_section_got<size, big_endian>::Got_entry::write(unsigned char* pov) | |
367 | const | |
368 | { | |
369 | Valtype val = 0; | |
370 | ||
371 | switch (this->local_sym_index_) | |
372 | { | |
373 | case GSYM_CODE: | |
374 | { | |
375 | Symbol* gsym = this->u_.gsym; | |
376 | ||
377 | // If the symbol is resolved locally, we need to write out its | |
378 | // value. Otherwise we just write zero. The target code is | |
379 | // responsible for creating a relocation entry to fill in the | |
380 | // value at runtime. | |
381 | if (gsym->is_resolved_locally()) | |
382 | { | |
383 | Sized_symbol<size>* sgsym; | |
384 | // This cast is a bit ugly. We don't want to put a | |
385 | // virtual method in Symbol, because we want Symbol to be | |
386 | // as small as possible. | |
387 | sgsym = static_cast<Sized_symbol<size>*>(gsym); | |
388 | val = sgsym->value(); | |
389 | } | |
390 | } | |
391 | break; | |
392 | ||
393 | case CONSTANT_CODE: | |
394 | val = this->u_.constant; | |
395 | break; | |
396 | ||
397 | default: | |
398 | abort(); | |
399 | } | |
400 | ||
401 | Valtype* povv = reinterpret_cast<Valtype*>(pov); | |
402 | Swap<size, big_endian>::writeval(povv, val); | |
403 | } | |
404 | ||
405 | // Output_section_data methods. | |
406 | ||
407 | unsigned int | |
408 | Output_section_data::do_out_shndx() const | |
409 | { | |
410 | assert(this->output_section_ != NULL); | |
411 | return this->output_section_->out_shndx(); | |
412 | } | |
413 | ||
414 | // Output_section_got methods. | |
415 | ||
416 | // Write out the GOT. | |
417 | ||
418 | template<int size, bool big_endian> | |
419 | void | |
420 | Output_section_got<size, big_endian>::do_write(Output_file* of) | |
421 | { | |
422 | const int add = size / 8; | |
423 | ||
424 | const off_t off = this->offset(); | |
425 | const off_t oview_size = this->entries_.size() * add; | |
426 | unsigned char* const oview = of->get_output_view(off, oview_size); | |
427 | ||
428 | unsigned char* pov = oview; | |
429 | for (typename Got_entries::const_iterator p = this->entries_.begin(); | |
430 | p != this->entries_.end(); | |
431 | ++p) | |
432 | { | |
433 | p->write(pov); | |
434 | pov += add; | |
435 | } | |
436 | ||
437 | of->write_output_view(off, oview_size, oview); | |
438 | ||
439 | // We no longer need the GOT entries. | |
440 | this->entries_.clear(); | |
441 | } | |
442 | ||
443 | // Output_section::Input_section methods. | |
444 | ||
445 | // Return the data size. For an input section we store the size here. | |
446 | // For an Output_section_data, we have to ask it for the size. | |
447 | ||
448 | off_t | |
449 | Output_section::Input_section::data_size() const | |
450 | { | |
451 | if (this->is_input_section()) | |
452 | return this->data_size_; | |
453 | else | |
454 | return this->u_.posd->data_size(); | |
455 | } | |
456 | ||
457 | // Set the address and file offset. | |
458 | ||
459 | void | |
460 | Output_section::Input_section::set_address(uint64_t addr, off_t off, | |
461 | off_t secoff) | |
462 | { | |
463 | if (this->is_input_section()) | |
464 | this->u_.object->set_section_offset(this->shndx_, off - secoff); | |
465 | else | |
466 | this->u_.posd->set_address(addr, off); | |
467 | } | |
468 | ||
469 | // Write out the data. We don't have to do anything for an input | |
470 | // section--they are handled via Object::relocate--but this is where | |
471 | // we write out the data for an Output_section_data. | |
472 | ||
473 | void | |
474 | Output_section::Input_section::write(Output_file* of) | |
475 | { | |
476 | if (!this->is_input_section()) | |
477 | this->u_.posd->write(of); | |
478 | } | |
479 | ||
a2fb1b05 ILT |
480 | // Output_section methods. |
481 | ||
482 | // Construct an Output_section. NAME will point into a Stringpool. | |
483 | ||
484 | Output_section::Output_section(const char* name, elfcpp::Elf_Word type, | |
ead1e424 | 485 | elfcpp::Elf_Xword flags, bool may_add_data) |
a2fb1b05 | 486 | : name_(name), |
a2fb1b05 ILT |
487 | addralign_(0), |
488 | entsize_(0), | |
a2fb1b05 ILT |
489 | link_(0), |
490 | info_(0), | |
491 | type_(type), | |
61ba1cf9 | 492 | flags_(flags), |
ead1e424 ILT |
493 | out_shndx_(0), |
494 | input_sections_(), | |
495 | first_input_offset_(0), | |
496 | may_add_data_(may_add_data) | |
a2fb1b05 ILT |
497 | { |
498 | } | |
499 | ||
54dc6425 ILT |
500 | Output_section::~Output_section() |
501 | { | |
502 | } | |
503 | ||
ead1e424 ILT |
504 | // Add the input section SHNDX, with header SHDR, named SECNAME, in |
505 | // OBJECT, to the Output_section. Return the offset of the input | |
506 | // section within the output section. We don't always keep track of | |
a2fb1b05 ILT |
507 | // input sections for an Output_section. Instead, each Object keeps |
508 | // track of the Output_section for each of its input sections. | |
509 | ||
510 | template<int size, bool big_endian> | |
511 | off_t | |
ead1e424 ILT |
512 | Output_section::add_input_section(Object* object, unsigned int shndx, |
513 | const char* secname, | |
a2fb1b05 ILT |
514 | const elfcpp::Shdr<size, big_endian>& shdr) |
515 | { | |
ead1e424 ILT |
516 | assert(this->may_add_data_); |
517 | ||
a2fb1b05 ILT |
518 | elfcpp::Elf_Xword addralign = shdr.get_sh_addralign(); |
519 | if ((addralign & (addralign - 1)) != 0) | |
520 | { | |
521 | fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"), | |
522 | program_name, object->name().c_str(), | |
523 | static_cast<unsigned long>(addralign), secname); | |
524 | gold_exit(false); | |
525 | } | |
a2fb1b05 ILT |
526 | |
527 | if (addralign > this->addralign_) | |
528 | this->addralign_ = addralign; | |
529 | ||
75f65a3e | 530 | off_t ssize = this->data_size(); |
ead1e424 ILT |
531 | ssize = align_address(ssize, addralign); |
532 | this->set_data_size(ssize + shdr.get_sh_size()); | |
a2fb1b05 | 533 | |
ead1e424 ILT |
534 | // We need to keep track of this section if we are already keeping |
535 | // track of sections, or if we are relaxing. FIXME: Add test for | |
536 | // relaxing. | |
537 | if (! this->input_sections_.empty()) | |
538 | this->input_sections_.push_back(Input_section(object, shndx, | |
539 | shdr.get_sh_size(), | |
540 | addralign)); | |
54dc6425 | 541 | |
61ba1cf9 ILT |
542 | return ssize; |
543 | } | |
544 | ||
ead1e424 ILT |
545 | // Add arbitrary data to an output section. |
546 | ||
547 | void | |
548 | Output_section::add_output_section_data(Output_section_data* posd) | |
549 | { | |
550 | if (this->input_sections_.empty()) | |
551 | this->first_input_offset_ = this->data_size(); | |
552 | this->input_sections_.push_back(Input_section(posd)); | |
553 | uint64_t addralign = posd->addralign(); | |
554 | if (addralign > this->addralign_) | |
555 | this->addralign_ = addralign; | |
556 | posd->set_output_section(this); | |
557 | } | |
558 | ||
559 | // Set the address of an Output_section. This is where we handle | |
560 | // setting the addresses of any Output_section_data objects. | |
561 | ||
562 | void | |
563 | Output_section::do_set_address(uint64_t address, off_t startoff) | |
564 | { | |
565 | if (this->input_sections_.empty()) | |
566 | return; | |
567 | ||
568 | off_t off = startoff + this->first_input_offset_; | |
569 | for (Input_section_list::iterator p = this->input_sections_.begin(); | |
570 | p != this->input_sections_.end(); | |
571 | ++p) | |
572 | { | |
573 | off = align_address(off, p->addralign()); | |
574 | p->set_address(address + (off - startoff), off, startoff); | |
575 | off += p->data_size(); | |
576 | } | |
577 | ||
578 | this->set_data_size(off - startoff); | |
579 | } | |
580 | ||
61ba1cf9 ILT |
581 | // Write the section header to *OSHDR. |
582 | ||
583 | template<int size, bool big_endian> | |
584 | void | |
585 | Output_section::write_header(const Stringpool* secnamepool, | |
586 | elfcpp::Shdr_write<size, big_endian>* oshdr) const | |
587 | { | |
588 | oshdr->put_sh_name(secnamepool->get_offset(this->name_)); | |
589 | oshdr->put_sh_type(this->type_); | |
590 | oshdr->put_sh_flags(this->flags_); | |
591 | oshdr->put_sh_addr(this->address()); | |
592 | oshdr->put_sh_offset(this->offset()); | |
593 | oshdr->put_sh_size(this->data_size()); | |
594 | oshdr->put_sh_link(this->link_); | |
595 | oshdr->put_sh_info(this->info_); | |
596 | oshdr->put_sh_addralign(this->addralign_); | |
597 | oshdr->put_sh_entsize(this->entsize_); | |
a2fb1b05 ILT |
598 | } |
599 | ||
ead1e424 ILT |
600 | // Write out the data. For input sections the data is written out by |
601 | // Object::relocate, but we have to handle Output_section_data objects | |
602 | // here. | |
603 | ||
604 | void | |
605 | Output_section::do_write(Output_file* of) | |
606 | { | |
607 | for (Input_section_list::iterator p = this->input_sections_.begin(); | |
608 | p != this->input_sections_.end(); | |
609 | ++p) | |
610 | p->write(of); | |
611 | } | |
612 | ||
75f65a3e ILT |
613 | // Output_section_symtab methods. |
614 | ||
ead1e424 ILT |
615 | Output_section_symtab::Output_section_symtab(const char* name, off_t size) |
616 | : Output_section(name, elfcpp::SHT_SYMTAB, 0, false) | |
75f65a3e ILT |
617 | { |
618 | this->set_data_size(size); | |
619 | } | |
620 | ||
621 | // Output_section_strtab methods. | |
622 | ||
623 | Output_section_strtab::Output_section_strtab(const char* name, | |
ead1e424 ILT |
624 | Stringpool* contents) |
625 | : Output_section(name, elfcpp::SHT_STRTAB, 0, false), | |
75f65a3e ILT |
626 | contents_(contents) |
627 | { | |
61ba1cf9 | 628 | this->set_data_size(contents->get_strtab_size()); |
75f65a3e ILT |
629 | } |
630 | ||
631 | void | |
61ba1cf9 | 632 | Output_section_strtab::do_write(Output_file* of) |
75f65a3e | 633 | { |
61ba1cf9 | 634 | this->contents_->write(of, this->offset()); |
75f65a3e ILT |
635 | } |
636 | ||
a2fb1b05 ILT |
637 | // Output segment methods. |
638 | ||
639 | Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
54dc6425 | 640 | : output_data_(), |
75f65a3e | 641 | output_bss_(), |
a2fb1b05 ILT |
642 | vaddr_(0), |
643 | paddr_(0), | |
644 | memsz_(0), | |
645 | align_(0), | |
646 | offset_(0), | |
647 | filesz_(0), | |
648 | type_(type), | |
ead1e424 ILT |
649 | flags_(flags), |
650 | is_align_known_(false) | |
a2fb1b05 ILT |
651 | { |
652 | } | |
653 | ||
654 | // Add an Output_section to an Output_segment. | |
655 | ||
656 | void | |
75f65a3e ILT |
657 | Output_segment::add_output_section(Output_section* os, |
658 | elfcpp::Elf_Word seg_flags) | |
a2fb1b05 | 659 | { |
75f65a3e | 660 | assert((os->flags() & elfcpp::SHF_ALLOC) != 0); |
ead1e424 | 661 | assert(!this->is_align_known_); |
75f65a3e | 662 | |
ead1e424 | 663 | // Update the segment flags. |
75f65a3e | 664 | this->flags_ |= seg_flags; |
75f65a3e ILT |
665 | |
666 | Output_segment::Output_data_list* pdl; | |
667 | if (os->type() == elfcpp::SHT_NOBITS) | |
668 | pdl = &this->output_bss_; | |
669 | else | |
670 | pdl = &this->output_data_; | |
54dc6425 | 671 | |
a2fb1b05 ILT |
672 | // So that PT_NOTE segments will work correctly, we need to ensure |
673 | // that all SHT_NOTE sections are adjacent. This will normally | |
674 | // happen automatically, because all the SHT_NOTE input sections | |
675 | // will wind up in the same output section. However, it is possible | |
676 | // for multiple SHT_NOTE input sections to have different section | |
677 | // flags, and thus be in different output sections, but for the | |
678 | // different section flags to map into the same segment flags and | |
679 | // thus the same output segment. | |
54dc6425 ILT |
680 | |
681 | // Note that while there may be many input sections in an output | |
682 | // section, there are normally only a few output sections in an | |
683 | // output segment. This loop is expected to be fast. | |
684 | ||
61ba1cf9 | 685 | if (os->type() == elfcpp::SHT_NOTE && !pdl->empty()) |
a2fb1b05 | 686 | { |
75f65a3e ILT |
687 | Layout::Data_list::iterator p = pdl->end(); |
688 | do | |
54dc6425 | 689 | { |
75f65a3e | 690 | --p; |
54dc6425 ILT |
691 | if ((*p)->is_section_type(elfcpp::SHT_NOTE)) |
692 | { | |
693 | ++p; | |
75f65a3e | 694 | pdl->insert(p, os); |
54dc6425 ILT |
695 | return; |
696 | } | |
697 | } | |
75f65a3e | 698 | while (p != pdl->begin()); |
54dc6425 ILT |
699 | } |
700 | ||
701 | // Similarly, so that PT_TLS segments will work, we need to group | |
75f65a3e ILT |
702 | // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special |
703 | // case: we group the SHF_TLS/SHT_NOBITS sections right after the | |
704 | // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS | |
705 | // correctly. | |
61ba1cf9 | 706 | if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty()) |
54dc6425 | 707 | { |
75f65a3e ILT |
708 | pdl = &this->output_data_; |
709 | bool nobits = os->type() == elfcpp::SHT_NOBITS; | |
ead1e424 | 710 | bool sawtls = false; |
75f65a3e ILT |
711 | Layout::Data_list::iterator p = pdl->end(); |
712 | do | |
a2fb1b05 | 713 | { |
75f65a3e | 714 | --p; |
ead1e424 ILT |
715 | bool insert; |
716 | if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)) | |
717 | { | |
718 | sawtls = true; | |
719 | // Put a NOBITS section after the first TLS section. | |
720 | // But a PROGBITS section after the first TLS/PROGBITS | |
721 | // section. | |
722 | insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS); | |
723 | } | |
724 | else | |
725 | { | |
726 | // If we've gone past the TLS sections, but we've seen a | |
727 | // TLS section, then we need to insert this section now. | |
728 | insert = sawtls; | |
729 | } | |
730 | ||
731 | if (insert) | |
a2fb1b05 ILT |
732 | { |
733 | ++p; | |
75f65a3e | 734 | pdl->insert(p, os); |
a2fb1b05 ILT |
735 | return; |
736 | } | |
737 | } | |
75f65a3e | 738 | while (p != pdl->begin()); |
ead1e424 ILT |
739 | |
740 | // There are no TLS sections yet; put this one at the end of the | |
741 | // section list. | |
a2fb1b05 ILT |
742 | } |
743 | ||
75f65a3e ILT |
744 | pdl->push_back(os); |
745 | } | |
746 | ||
747 | // Add an Output_data (which is not an Output_section) to the start of | |
748 | // a segment. | |
749 | ||
750 | void | |
751 | Output_segment::add_initial_output_data(Output_data* od) | |
752 | { | |
ead1e424 | 753 | assert(!this->is_align_known_); |
75f65a3e ILT |
754 | this->output_data_.push_front(od); |
755 | } | |
756 | ||
757 | // Return the maximum alignment of the Output_data in Output_segment. | |
ead1e424 | 758 | // Once we compute this, we prohibit new sections from being added. |
75f65a3e ILT |
759 | |
760 | uint64_t | |
ead1e424 | 761 | Output_segment::addralign() |
75f65a3e | 762 | { |
ead1e424 ILT |
763 | if (!this->is_align_known_) |
764 | { | |
765 | uint64_t addralign; | |
766 | ||
767 | addralign = Output_segment::maximum_alignment(&this->output_data_); | |
768 | if (addralign > this->align_) | |
769 | this->align_ = addralign; | |
770 | ||
771 | addralign = Output_segment::maximum_alignment(&this->output_bss_); | |
772 | if (addralign > this->align_) | |
773 | this->align_ = addralign; | |
774 | ||
775 | this->is_align_known_ = true; | |
776 | } | |
777 | ||
75f65a3e ILT |
778 | return this->align_; |
779 | } | |
780 | ||
ead1e424 ILT |
781 | // Return the maximum alignment of a list of Output_data. |
782 | ||
783 | uint64_t | |
784 | Output_segment::maximum_alignment(const Output_data_list* pdl) | |
785 | { | |
786 | uint64_t ret = 0; | |
787 | for (Output_data_list::const_iterator p = pdl->begin(); | |
788 | p != pdl->end(); | |
789 | ++p) | |
790 | { | |
791 | uint64_t addralign = (*p)->addralign(); | |
792 | if (addralign > ret) | |
793 | ret = addralign; | |
794 | } | |
795 | return ret; | |
796 | } | |
797 | ||
75f65a3e | 798 | // Set the section addresses for an Output_segment. ADDR is the |
ead1e424 ILT |
799 | // address and *POFF is the file offset. Set the section indexes |
800 | // starting with *PSHNDX. Return the address of the immediately | |
801 | // following segment. Update *POFF and *PSHNDX. | |
75f65a3e ILT |
802 | |
803 | uint64_t | |
ead1e424 ILT |
804 | Output_segment::set_section_addresses(uint64_t addr, off_t* poff, |
805 | unsigned int* pshndx) | |
75f65a3e ILT |
806 | { |
807 | assert(this->type_ == elfcpp::PT_LOAD); | |
808 | ||
809 | this->vaddr_ = addr; | |
810 | this->paddr_ = addr; | |
811 | ||
812 | off_t orig_off = *poff; | |
813 | this->offset_ = orig_off; | |
814 | ||
ead1e424 ILT |
815 | *poff = align_address(*poff, this->addralign()); |
816 | ||
817 | addr = this->set_section_list_addresses(&this->output_data_, addr, poff, | |
818 | pshndx); | |
75f65a3e ILT |
819 | this->filesz_ = *poff - orig_off; |
820 | ||
821 | off_t off = *poff; | |
822 | ||
61ba1cf9 | 823 | uint64_t ret = this->set_section_list_addresses(&this->output_bss_, addr, |
ead1e424 | 824 | poff, pshndx); |
75f65a3e ILT |
825 | this->memsz_ = *poff - orig_off; |
826 | ||
827 | // Ignore the file offset adjustments made by the BSS Output_data | |
828 | // objects. | |
829 | *poff = off; | |
61ba1cf9 ILT |
830 | |
831 | return ret; | |
75f65a3e ILT |
832 | } |
833 | ||
834 | // Set the addresses in a list of Output_data structures. | |
835 | ||
836 | uint64_t | |
837 | Output_segment::set_section_list_addresses(Output_data_list* pdl, | |
ead1e424 ILT |
838 | uint64_t addr, off_t* poff, |
839 | unsigned int* pshndx) | |
75f65a3e | 840 | { |
ead1e424 | 841 | off_t startoff = *poff; |
75f65a3e | 842 | |
ead1e424 | 843 | off_t off = startoff; |
75f65a3e ILT |
844 | for (Output_data_list::iterator p = pdl->begin(); |
845 | p != pdl->end(); | |
846 | ++p) | |
847 | { | |
ead1e424 ILT |
848 | off = align_address(off, (*p)->addralign()); |
849 | (*p)->set_address(addr + (off - startoff), off); | |
850 | ||
851 | // Unless this is a PT_TLS segment, we want to ignore the size | |
852 | // of a SHF_TLS/SHT_NOBITS section. Such a section does not | |
853 | // affect the size of a PT_LOAD segment. | |
854 | if (this->type_ == elfcpp::PT_TLS | |
855 | || !(*p)->is_section_flag_set(elfcpp::SHF_TLS) | |
856 | || !(*p)->is_section_type(elfcpp::SHT_NOBITS)) | |
857 | off += (*p)->data_size(); | |
75f65a3e | 858 | |
ead1e424 ILT |
859 | if ((*p)->is_section()) |
860 | { | |
861 | (*p)->set_out_shndx(*pshndx); | |
862 | ++*pshndx; | |
863 | } | |
75f65a3e ILT |
864 | } |
865 | ||
866 | *poff = off; | |
ead1e424 | 867 | return addr + (off - startoff); |
75f65a3e ILT |
868 | } |
869 | ||
870 | // For a non-PT_LOAD segment, set the offset from the sections, if | |
871 | // any. | |
872 | ||
873 | void | |
874 | Output_segment::set_offset() | |
875 | { | |
876 | assert(this->type_ != elfcpp::PT_LOAD); | |
877 | ||
878 | if (this->output_data_.empty() && this->output_bss_.empty()) | |
879 | { | |
880 | this->vaddr_ = 0; | |
881 | this->paddr_ = 0; | |
882 | this->memsz_ = 0; | |
883 | this->align_ = 0; | |
884 | this->offset_ = 0; | |
885 | this->filesz_ = 0; | |
886 | return; | |
887 | } | |
888 | ||
889 | const Output_data* first; | |
890 | if (this->output_data_.empty()) | |
891 | first = this->output_bss_.front(); | |
892 | else | |
893 | first = this->output_data_.front(); | |
894 | this->vaddr_ = first->address(); | |
895 | this->paddr_ = this->vaddr_; | |
896 | this->offset_ = first->offset(); | |
897 | ||
898 | if (this->output_data_.empty()) | |
899 | this->filesz_ = 0; | |
900 | else | |
901 | { | |
902 | const Output_data* last_data = this->output_data_.back(); | |
903 | this->filesz_ = (last_data->address() | |
904 | + last_data->data_size() | |
905 | - this->vaddr_); | |
906 | } | |
907 | ||
908 | const Output_data* last; | |
909 | if (this->output_bss_.empty()) | |
910 | last = this->output_data_.back(); | |
911 | else | |
912 | last = this->output_bss_.back(); | |
913 | this->memsz_ = (last->address() | |
914 | + last->data_size() | |
915 | - this->vaddr_); | |
75f65a3e ILT |
916 | } |
917 | ||
918 | // Return the number of Output_sections in an Output_segment. | |
919 | ||
920 | unsigned int | |
921 | Output_segment::output_section_count() const | |
922 | { | |
923 | return (this->output_section_count_list(&this->output_data_) | |
924 | + this->output_section_count_list(&this->output_bss_)); | |
925 | } | |
926 | ||
927 | // Return the number of Output_sections in an Output_data_list. | |
928 | ||
929 | unsigned int | |
930 | Output_segment::output_section_count_list(const Output_data_list* pdl) const | |
931 | { | |
932 | unsigned int count = 0; | |
933 | for (Output_data_list::const_iterator p = pdl->begin(); | |
934 | p != pdl->end(); | |
935 | ++p) | |
936 | { | |
937 | if ((*p)->is_section()) | |
938 | ++count; | |
939 | } | |
940 | return count; | |
a2fb1b05 ILT |
941 | } |
942 | ||
61ba1cf9 ILT |
943 | // Write the segment data into *OPHDR. |
944 | ||
945 | template<int size, bool big_endian> | |
946 | void | |
ead1e424 | 947 | Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr) |
61ba1cf9 ILT |
948 | { |
949 | ophdr->put_p_type(this->type_); | |
950 | ophdr->put_p_offset(this->offset_); | |
951 | ophdr->put_p_vaddr(this->vaddr_); | |
952 | ophdr->put_p_paddr(this->paddr_); | |
953 | ophdr->put_p_filesz(this->filesz_); | |
954 | ophdr->put_p_memsz(this->memsz_); | |
955 | ophdr->put_p_flags(this->flags_); | |
ead1e424 | 956 | ophdr->put_p_align(this->addralign()); |
61ba1cf9 ILT |
957 | } |
958 | ||
959 | // Write the section headers into V. | |
960 | ||
961 | template<int size, bool big_endian> | |
962 | unsigned char* | |
963 | Output_segment::write_section_headers(const Stringpool* secnamepool, | |
ead1e424 ILT |
964 | unsigned char* v, |
965 | unsigned int *pshndx | |
5482377d ILT |
966 | ACCEPT_SIZE_ENDIAN) const |
967 | { | |
ead1e424 ILT |
968 | // Every section that is attached to a segment must be attached to a |
969 | // PT_LOAD segment, so we only write out section headers for PT_LOAD | |
970 | // segments. | |
971 | if (this->type_ != elfcpp::PT_LOAD) | |
972 | return v; | |
973 | ||
593f47df ILT |
974 | v = this->write_section_headers_list |
975 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
976 | secnamepool, &this->output_data_, v, pshndx | |
977 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
978 | v = this->write_section_headers_list | |
979 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
980 | secnamepool, &this->output_bss_, v, pshndx | |
981 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
61ba1cf9 ILT |
982 | return v; |
983 | } | |
984 | ||
985 | template<int size, bool big_endian> | |
986 | unsigned char* | |
987 | Output_segment::write_section_headers_list(const Stringpool* secnamepool, | |
988 | const Output_data_list* pdl, | |
ead1e424 ILT |
989 | unsigned char* v, |
990 | unsigned int* pshndx | |
5482377d | 991 | ACCEPT_SIZE_ENDIAN) const |
61ba1cf9 ILT |
992 | { |
993 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
994 | for (Output_data_list::const_iterator p = pdl->begin(); | |
995 | p != pdl->end(); | |
996 | ++p) | |
997 | { | |
998 | if ((*p)->is_section()) | |
999 | { | |
5482377d | 1000 | const Output_section* ps = static_cast<const Output_section*>(*p); |
ead1e424 | 1001 | assert(*pshndx == ps->out_shndx()); |
61ba1cf9 ILT |
1002 | elfcpp::Shdr_write<size, big_endian> oshdr(v); |
1003 | ps->write_header(secnamepool, &oshdr); | |
1004 | v += shdr_size; | |
ead1e424 | 1005 | ++*pshndx; |
61ba1cf9 ILT |
1006 | } |
1007 | } | |
1008 | return v; | |
1009 | } | |
1010 | ||
a2fb1b05 ILT |
1011 | // Output_file methods. |
1012 | ||
61ba1cf9 ILT |
1013 | Output_file::Output_file(const General_options& options) |
1014 | : options_(options), | |
1015 | name_(options.output_file_name()), | |
1016 | o_(-1), | |
1017 | file_size_(0), | |
1018 | base_(NULL) | |
1019 | { | |
1020 | } | |
1021 | ||
1022 | // Open the output file. | |
1023 | ||
a2fb1b05 | 1024 | void |
61ba1cf9 | 1025 | Output_file::open(off_t file_size) |
a2fb1b05 | 1026 | { |
61ba1cf9 ILT |
1027 | this->file_size_ = file_size; |
1028 | ||
1029 | int mode = this->options_.is_relocatable() ? 0666 : 0777; | |
1030 | int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode); | |
1031 | if (o < 0) | |
1032 | { | |
1033 | fprintf(stderr, _("%s: %s: open: %s\n"), | |
1034 | program_name, this->name_, strerror(errno)); | |
1035 | gold_exit(false); | |
1036 | } | |
1037 | this->o_ = o; | |
1038 | ||
1039 | // Write out one byte to make the file the right size. | |
1040 | if (::lseek(o, file_size - 1, SEEK_SET) < 0) | |
1041 | { | |
1042 | fprintf(stderr, _("%s: %s: lseek: %s\n"), | |
1043 | program_name, this->name_, strerror(errno)); | |
1044 | gold_exit(false); | |
1045 | } | |
1046 | char b = 0; | |
1047 | if (::write(o, &b, 1) != 1) | |
1048 | { | |
1049 | fprintf(stderr, _("%s: %s: write: %s\n"), | |
1050 | program_name, this->name_, strerror(errno)); | |
1051 | gold_exit(false); | |
1052 | } | |
1053 | ||
1054 | // Map the file into memory. | |
1055 | void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE, | |
1056 | MAP_SHARED, o, 0); | |
1057 | if (base == MAP_FAILED) | |
1058 | { | |
1059 | fprintf(stderr, _("%s: %s: mmap: %s\n"), | |
1060 | program_name, this->name_, strerror(errno)); | |
1061 | gold_exit(false); | |
1062 | } | |
1063 | this->base_ = static_cast<unsigned char*>(base); | |
1064 | } | |
1065 | ||
1066 | // Close the output file. | |
1067 | ||
1068 | void | |
1069 | Output_file::close() | |
1070 | { | |
1071 | if (::munmap(this->base_, this->file_size_) < 0) | |
1072 | { | |
1073 | fprintf(stderr, _("%s: %s: munmap: %s\n"), | |
1074 | program_name, this->name_, strerror(errno)); | |
1075 | gold_exit(false); | |
1076 | } | |
1077 | this->base_ = NULL; | |
1078 | ||
1079 | if (::close(this->o_) < 0) | |
1080 | { | |
1081 | fprintf(stderr, _("%s: %s: close: %s\n"), | |
1082 | program_name, this->name_, strerror(errno)); | |
1083 | gold_exit(false); | |
1084 | } | |
1085 | this->o_ = -1; | |
a2fb1b05 ILT |
1086 | } |
1087 | ||
1088 | // Instantiate the templates we need. We could use the configure | |
1089 | // script to restrict this to only the ones for implemented targets. | |
1090 | ||
1091 | template | |
1092 | off_t | |
1093 | Output_section::add_input_section<32, false>( | |
1094 | Object* object, | |
ead1e424 | 1095 | unsigned int shndx, |
a2fb1b05 ILT |
1096 | const char* secname, |
1097 | const elfcpp::Shdr<32, false>& shdr); | |
1098 | ||
1099 | template | |
1100 | off_t | |
1101 | Output_section::add_input_section<32, true>( | |
1102 | Object* object, | |
ead1e424 | 1103 | unsigned int shndx, |
a2fb1b05 ILT |
1104 | const char* secname, |
1105 | const elfcpp::Shdr<32, true>& shdr); | |
1106 | ||
1107 | template | |
1108 | off_t | |
1109 | Output_section::add_input_section<64, false>( | |
1110 | Object* object, | |
ead1e424 | 1111 | unsigned int shndx, |
a2fb1b05 ILT |
1112 | const char* secname, |
1113 | const elfcpp::Shdr<64, false>& shdr); | |
1114 | ||
1115 | template | |
1116 | off_t | |
1117 | Output_section::add_input_section<64, true>( | |
1118 | Object* object, | |
ead1e424 | 1119 | unsigned int shndx, |
a2fb1b05 ILT |
1120 | const char* secname, |
1121 | const elfcpp::Shdr<64, true>& shdr); | |
1122 | ||
ead1e424 ILT |
1123 | template |
1124 | void | |
1125 | Output_section_got<32, false>::do_write(Output_file* of); | |
1126 | ||
1127 | template | |
1128 | void | |
1129 | Output_section_got<32, true>::do_write(Output_file* of); | |
1130 | ||
1131 | template | |
1132 | void | |
1133 | Output_section_got<64, false>::do_write(Output_file* of); | |
1134 | ||
1135 | template | |
1136 | void | |
1137 | Output_section_got<64, true>::do_write(Output_file* of); | |
1138 | ||
a2fb1b05 | 1139 | } // End namespace gold. |