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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
a2fb1b05 | 5 | #include <cstring> |
54dc6425 | 6 | #include <algorithm> |
a2fb1b05 ILT |
7 | #include <iostream> |
8 | #include <utility> | |
9 | ||
10 | #include "output.h" | |
f6ce93d6 | 11 | #include "symtab.h" |
a3ad94ed | 12 | #include "dynobj.h" |
a2fb1b05 ILT |
13 | #include "layout.h" |
14 | ||
15 | namespace gold | |
16 | { | |
17 | ||
92e059d8 | 18 | // Layout_task_runner methods. |
a2fb1b05 ILT |
19 | |
20 | // Lay out the sections. This is called after all the input objects | |
21 | // have been read. | |
22 | ||
23 | void | |
92e059d8 | 24 | Layout_task_runner::run(Workqueue* workqueue) |
a2fb1b05 | 25 | { |
12e14209 ILT |
26 | off_t file_size = this->layout_->finalize(this->input_objects_, |
27 | this->symtab_); | |
61ba1cf9 ILT |
28 | |
29 | // Now we know the final size of the output file and we know where | |
30 | // each piece of information goes. | |
31 | Output_file* of = new Output_file(this->options_); | |
32 | of->open(file_size); | |
33 | ||
34 | // Queue up the final set of tasks. | |
35 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 36 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
37 | } |
38 | ||
39 | // Layout methods. | |
40 | ||
54dc6425 | 41 | Layout::Layout(const General_options& options) |
a3ad94ed | 42 | : options_(options), namepool_(), sympool_(), dynpool_(), signatures_(), |
61ba1cf9 | 43 | section_name_map_(), segment_list_(), section_list_(), |
a3ad94ed ILT |
44 | unattached_section_list_(), special_output_list_(), |
45 | tls_segment_(NULL), symtab_section_(NULL), dynsym_section_(NULL) | |
54dc6425 ILT |
46 | { |
47 | // Make space for more than enough segments for a typical file. | |
48 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
49 | this->segment_list_.reserve(12); |
50 | ||
51 | // We expect three unattached Output_data objects: the file header, | |
52 | // the segment headers, and the section headers. | |
53 | this->special_output_list_.reserve(3); | |
54dc6425 ILT |
54 | } |
55 | ||
a2fb1b05 ILT |
56 | // Hash a key we use to look up an output section mapping. |
57 | ||
58 | size_t | |
59 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
60 | { | |
f0641a0b | 61 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
62 | } |
63 | ||
64 | // Whether to include this section in the link. | |
65 | ||
66 | template<int size, bool big_endian> | |
67 | bool | |
68 | Layout::include_section(Object*, const char*, | |
69 | const elfcpp::Shdr<size, big_endian>& shdr) | |
70 | { | |
71 | // Some section types are never linked. Some are only linked when | |
72 | // doing a relocateable link. | |
73 | switch (shdr.get_sh_type()) | |
74 | { | |
75 | case elfcpp::SHT_NULL: | |
76 | case elfcpp::SHT_SYMTAB: | |
77 | case elfcpp::SHT_DYNSYM: | |
78 | case elfcpp::SHT_STRTAB: | |
79 | case elfcpp::SHT_HASH: | |
80 | case elfcpp::SHT_DYNAMIC: | |
81 | case elfcpp::SHT_SYMTAB_SHNDX: | |
82 | return false; | |
83 | ||
84 | case elfcpp::SHT_RELA: | |
85 | case elfcpp::SHT_REL: | |
86 | case elfcpp::SHT_GROUP: | |
87 | return this->options_.is_relocatable(); | |
88 | ||
89 | default: | |
90 | // FIXME: Handle stripping debug sections here. | |
91 | return true; | |
92 | } | |
93 | } | |
94 | ||
ead1e424 | 95 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 96 | |
a2fb1b05 | 97 | Output_section* |
ead1e424 | 98 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 99 | { |
ead1e424 ILT |
100 | for (Section_name_map::const_iterator p = this->section_name_map_.begin(); |
101 | p != this->section_name_map_.end(); | |
102 | ++p) | |
f0641a0b | 103 | if (strcmp(p->second->name(), name) == 0) |
ead1e424 ILT |
104 | return p->second; |
105 | return NULL; | |
106 | } | |
a2fb1b05 | 107 | |
ead1e424 ILT |
108 | // Return an output segment of type TYPE, with segment flags SET set |
109 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 110 | |
ead1e424 ILT |
111 | Output_segment* |
112 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
113 | elfcpp::Elf_Word clear) const | |
114 | { | |
115 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
116 | p != this->segment_list_.end(); | |
117 | ++p) | |
118 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
119 | && ((*p)->flags() & set) == set | |
120 | && ((*p)->flags() & clear) == 0) | |
121 | return *p; | |
122 | return NULL; | |
123 | } | |
a2fb1b05 | 124 | |
ead1e424 ILT |
125 | // Return the output section to use for section NAME with type TYPE |
126 | // and section flags FLAGS. | |
a2fb1b05 | 127 | |
ead1e424 | 128 | Output_section* |
f0641a0b ILT |
129 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
130 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) | |
ead1e424 ILT |
131 | { |
132 | // We should ignore some flags. | |
133 | flags &= ~ (elfcpp::SHF_INFO_LINK | |
134 | | elfcpp::SHF_LINK_ORDER | |
135 | | elfcpp::SHF_GROUP); | |
a2fb1b05 | 136 | |
f0641a0b | 137 | const Key key(name_key, std::make_pair(type, flags)); |
a2fb1b05 ILT |
138 | const std::pair<Key, Output_section*> v(key, NULL); |
139 | std::pair<Section_name_map::iterator, bool> ins( | |
140 | this->section_name_map_.insert(v)); | |
141 | ||
a2fb1b05 | 142 | if (!ins.second) |
ead1e424 | 143 | return ins.first->second; |
a2fb1b05 ILT |
144 | else |
145 | { | |
146 | // This is the first time we've seen this name/type/flags | |
147 | // combination. | |
ead1e424 | 148 | Output_section* os = this->make_output_section(name, type, flags); |
a2fb1b05 | 149 | ins.first->second = os; |
ead1e424 | 150 | return os; |
a2fb1b05 | 151 | } |
ead1e424 ILT |
152 | } |
153 | ||
154 | // Return the output section to use for input section SHNDX, with name | |
155 | // NAME, with header HEADER, from object OBJECT. Set *OFF to the | |
156 | // offset of this input section without the output section. | |
157 | ||
158 | template<int size, bool big_endian> | |
159 | Output_section* | |
f6ce93d6 | 160 | Layout::layout(Relobj* object, unsigned int shndx, const char* name, |
ead1e424 ILT |
161 | const elfcpp::Shdr<size, big_endian>& shdr, off_t* off) |
162 | { | |
163 | if (!this->include_section(object, name, shdr)) | |
164 | return NULL; | |
165 | ||
166 | // If we are not doing a relocateable link, choose the name to use | |
167 | // for the output section. | |
168 | size_t len = strlen(name); | |
169 | if (!this->options_.is_relocatable()) | |
170 | name = Layout::output_section_name(name, &len); | |
171 | ||
172 | // FIXME: Handle SHF_OS_NONCONFORMING here. | |
173 | ||
174 | // Canonicalize the section name. | |
f0641a0b ILT |
175 | Stringpool::Key name_key; |
176 | name = this->namepool_.add(name, len, &name_key); | |
ead1e424 ILT |
177 | |
178 | // Find the output section. The output section is selected based on | |
179 | // the section name, type, and flags. | |
f0641a0b ILT |
180 | Output_section* os = this->get_output_section(name, name_key, |
181 | shdr.get_sh_type(), | |
ead1e424 | 182 | shdr.get_sh_flags()); |
a2fb1b05 ILT |
183 | |
184 | // FIXME: Handle SHF_LINK_ORDER somewhere. | |
185 | ||
ead1e424 | 186 | *off = os->add_input_section(object, shndx, name, shdr); |
a2fb1b05 ILT |
187 | |
188 | return os; | |
189 | } | |
190 | ||
ead1e424 ILT |
191 | // Add POSD to an output section using NAME, TYPE, and FLAGS. |
192 | ||
193 | void | |
194 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, | |
195 | elfcpp::Elf_Xword flags, | |
196 | Output_section_data* posd) | |
197 | { | |
198 | // Canonicalize the name. | |
f0641a0b ILT |
199 | Stringpool::Key name_key; |
200 | name = this->namepool_.add(name, &name_key); | |
ead1e424 | 201 | |
f0641a0b | 202 | Output_section* os = this->get_output_section(name, name_key, type, flags); |
ead1e424 ILT |
203 | os->add_output_section_data(posd); |
204 | } | |
205 | ||
a2fb1b05 ILT |
206 | // Map section flags to segment flags. |
207 | ||
208 | elfcpp::Elf_Word | |
209 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
210 | { | |
211 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
212 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
213 | ret |= elfcpp::PF_W; | |
214 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
215 | ret |= elfcpp::PF_X; | |
216 | return ret; | |
217 | } | |
218 | ||
219 | // Make a new Output_section, and attach it to segments as | |
220 | // appropriate. | |
221 | ||
222 | Output_section* | |
223 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
224 | elfcpp::Elf_Xword flags) | |
225 | { | |
ead1e424 | 226 | Output_section* os = new Output_section(name, type, flags, true); |
a3ad94ed | 227 | this->section_list_.push_back(os); |
a2fb1b05 ILT |
228 | |
229 | if ((flags & elfcpp::SHF_ALLOC) == 0) | |
a3ad94ed | 230 | this->unattached_section_list_.push_back(os); |
a2fb1b05 ILT |
231 | else |
232 | { | |
233 | // This output section goes into a PT_LOAD segment. | |
234 | ||
235 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); | |
236 | ||
237 | // The only thing we really care about for PT_LOAD segments is | |
238 | // whether or not they are writable, so that is how we search | |
239 | // for them. People who need segments sorted on some other | |
240 | // basis will have to wait until we implement a mechanism for | |
241 | // them to describe the segments they want. | |
242 | ||
243 | Segment_list::const_iterator p; | |
244 | for (p = this->segment_list_.begin(); | |
245 | p != this->segment_list_.end(); | |
246 | ++p) | |
247 | { | |
248 | if ((*p)->type() == elfcpp::PT_LOAD | |
249 | && ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W)) | |
250 | { | |
75f65a3e | 251 | (*p)->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
252 | break; |
253 | } | |
254 | } | |
255 | ||
256 | if (p == this->segment_list_.end()) | |
257 | { | |
258 | Output_segment* oseg = new Output_segment(elfcpp::PT_LOAD, | |
259 | seg_flags); | |
260 | this->segment_list_.push_back(oseg); | |
75f65a3e | 261 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
262 | } |
263 | ||
264 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE | |
265 | // segment. | |
266 | if (type == elfcpp::SHT_NOTE) | |
267 | { | |
268 | // See if we already have an equivalent PT_NOTE segment. | |
269 | for (p = this->segment_list_.begin(); | |
270 | p != segment_list_.end(); | |
271 | ++p) | |
272 | { | |
273 | if ((*p)->type() == elfcpp::PT_NOTE | |
274 | && (((*p)->flags() & elfcpp::PF_W) | |
275 | == (seg_flags & elfcpp::PF_W))) | |
276 | { | |
75f65a3e | 277 | (*p)->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
278 | break; |
279 | } | |
280 | } | |
281 | ||
282 | if (p == this->segment_list_.end()) | |
283 | { | |
284 | Output_segment* oseg = new Output_segment(elfcpp::PT_NOTE, | |
285 | seg_flags); | |
286 | this->segment_list_.push_back(oseg); | |
75f65a3e | 287 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
288 | } |
289 | } | |
54dc6425 ILT |
290 | |
291 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
92e059d8 | 292 | // segment. There can only be one such segment. |
54dc6425 ILT |
293 | if ((flags & elfcpp::SHF_TLS) != 0) |
294 | { | |
92e059d8 | 295 | if (this->tls_segment_ == NULL) |
54dc6425 | 296 | { |
92e059d8 ILT |
297 | this->tls_segment_ = new Output_segment(elfcpp::PT_TLS, |
298 | seg_flags); | |
299 | this->segment_list_.push_back(this->tls_segment_); | |
54dc6425 | 300 | } |
92e059d8 | 301 | this->tls_segment_->add_output_section(os, seg_flags); |
54dc6425 | 302 | } |
a2fb1b05 ILT |
303 | } |
304 | ||
305 | return os; | |
306 | } | |
307 | ||
a3ad94ed ILT |
308 | // Create the dynamic sections which are needed before we read the |
309 | // relocs. | |
310 | ||
311 | void | |
312 | Layout::create_initial_dynamic_sections(const Input_objects* input_objects, | |
313 | Symbol_table* symtab) | |
314 | { | |
315 | if (!input_objects->any_dynamic()) | |
316 | return; | |
317 | ||
318 | const char* dynamic_name = this->namepool_.add(".dynamic", NULL); | |
319 | this->dynamic_section_ = this->make_output_section(dynamic_name, | |
320 | elfcpp::SHT_DYNAMIC, | |
321 | (elfcpp::SHF_ALLOC | |
322 | | elfcpp::SHF_WRITE)); | |
323 | ||
324 | symtab->define_in_output_data(input_objects->target(), "_DYNAMIC", | |
325 | this->dynamic_section_, 0, 0, | |
326 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
327 | elfcpp::STV_HIDDEN, 0, false, false); | |
328 | } | |
329 | ||
75f65a3e ILT |
330 | // Find the first read-only PT_LOAD segment, creating one if |
331 | // necessary. | |
54dc6425 | 332 | |
75f65a3e ILT |
333 | Output_segment* |
334 | Layout::find_first_load_seg() | |
54dc6425 | 335 | { |
75f65a3e ILT |
336 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
337 | p != this->segment_list_.end(); | |
338 | ++p) | |
339 | { | |
340 | if ((*p)->type() == elfcpp::PT_LOAD | |
341 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
342 | && ((*p)->flags() & elfcpp::PF_W) == 0) | |
343 | return *p; | |
344 | } | |
345 | ||
346 | Output_segment* load_seg = new Output_segment(elfcpp::PT_LOAD, elfcpp::PF_R); | |
347 | this->segment_list_.push_back(load_seg); | |
348 | return load_seg; | |
54dc6425 ILT |
349 | } |
350 | ||
351 | // Finalize the layout. When this is called, we have created all the | |
352 | // output sections and all the output segments which are based on | |
353 | // input sections. We have several things to do, and we have to do | |
354 | // them in the right order, so that we get the right results correctly | |
355 | // and efficiently. | |
356 | ||
357 | // 1) Finalize the list of output segments and create the segment | |
358 | // table header. | |
359 | ||
360 | // 2) Finalize the dynamic symbol table and associated sections. | |
361 | ||
362 | // 3) Determine the final file offset of all the output segments. | |
363 | ||
364 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
365 | // sections. | |
366 | ||
75f65a3e ILT |
367 | // 5) Create the symbol table sections and the section name table |
368 | // section. | |
369 | ||
370 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
371 | // value and make a final determination of which symbols are going |
372 | // into the output symbol table. | |
373 | ||
54dc6425 ILT |
374 | // 7) Create the section table header. |
375 | ||
376 | // 8) Determine the final file offset of all the output sections which | |
377 | // are not SHF_ALLOC, including the section table header. | |
378 | ||
379 | // 9) Finalize the ELF file header. | |
380 | ||
75f65a3e ILT |
381 | // This function returns the size of the output file. |
382 | ||
383 | off_t | |
384 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab) | |
54dc6425 | 385 | { |
5a6f7e2d | 386 | Target* const target = input_objects->target(); |
a3ad94ed | 387 | const int size = target->get_size(); |
dbe717ef | 388 | |
5a6f7e2d ILT |
389 | target->finalize_sections(this); |
390 | ||
dbe717ef | 391 | Output_segment* phdr_seg = NULL; |
54dc6425 ILT |
392 | if (input_objects->any_dynamic()) |
393 | { | |
dbe717ef ILT |
394 | // There was a dynamic object in the link. We need to create |
395 | // some information for the dynamic linker. | |
396 | ||
397 | // Create the PT_PHDR segment which will hold the program | |
398 | // headers. | |
399 | phdr_seg = new Output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
400 | this->segment_list_.push_back(phdr_seg); | |
401 | ||
a3ad94ed ILT |
402 | // This holds the dynamic tags. |
403 | Output_data_dynamic* odyn; | |
404 | odyn = new Output_data_dynamic(input_objects->target(), | |
405 | &this->dynpool_); | |
406 | ||
dbe717ef ILT |
407 | // Create the dynamic symbol table, including the hash table, |
408 | // the dynamic relocations, and the version sections. | |
a3ad94ed | 409 | this->create_dynamic_symtab(target, odyn, symtab); |
dbe717ef ILT |
410 | |
411 | // Create the .interp section to hold the name of the | |
412 | // interpreter, and put it in a PT_INTERP segment. | |
a3ad94ed ILT |
413 | this->create_interp(target); |
414 | ||
415 | // Finish the .dynamic section to hold the dynamic data, and put | |
416 | // it in a PT_DYNAMIC segment. | |
417 | this->finish_dynamic_section(input_objects, symtab, odyn); | |
54dc6425 ILT |
418 | } |
419 | ||
420 | // FIXME: Handle PT_GNU_STACK. | |
421 | ||
75f65a3e ILT |
422 | Output_segment* load_seg = this->find_first_load_seg(); |
423 | ||
424 | // Lay out the segment headers. | |
a3ad94ed | 425 | bool big_endian = target->is_big_endian(); |
75f65a3e | 426 | Output_segment_headers* segment_headers; |
61ba1cf9 ILT |
427 | segment_headers = new Output_segment_headers(size, big_endian, |
428 | this->segment_list_); | |
75f65a3e | 429 | load_seg->add_initial_output_data(segment_headers); |
61ba1cf9 | 430 | this->special_output_list_.push_back(segment_headers); |
dbe717ef ILT |
431 | if (phdr_seg != NULL) |
432 | phdr_seg->add_initial_output_data(segment_headers); | |
75f65a3e ILT |
433 | |
434 | // Lay out the file header. | |
435 | Output_file_header* file_header; | |
436 | file_header = new Output_file_header(size, | |
61ba1cf9 | 437 | big_endian, |
75f65a3e | 438 | this->options_, |
a3ad94ed | 439 | target, |
75f65a3e ILT |
440 | symtab, |
441 | segment_headers); | |
442 | load_seg->add_initial_output_data(file_header); | |
61ba1cf9 | 443 | this->special_output_list_.push_back(file_header); |
75f65a3e | 444 | |
ead1e424 ILT |
445 | // We set the output section indexes in set_segment_offsets and |
446 | // set_section_offsets. | |
447 | unsigned int shndx = 1; | |
448 | ||
449 | // Set the file offsets of all the segments, and all the sections | |
450 | // they contain. | |
a3ad94ed | 451 | off_t off = this->set_segment_offsets(target, load_seg, &shndx); |
75f65a3e ILT |
452 | |
453 | // Create the symbol table sections. | |
454 | // FIXME: We don't need to do this if we are stripping symbols. | |
75f65a3e | 455 | Output_section* ostrtab; |
61ba1cf9 | 456 | this->create_symtab_sections(size, input_objects, symtab, &off, |
a3ad94ed | 457 | &ostrtab); |
75f65a3e ILT |
458 | |
459 | // Create the .shstrtab section. | |
460 | Output_section* shstrtab_section = this->create_shstrtab(); | |
461 | ||
462 | // Set the file offsets of all the sections not associated with | |
463 | // segments. | |
ead1e424 ILT |
464 | off = this->set_section_offsets(off, &shndx); |
465 | ||
466 | // Now the section index of OSTRTAB is set. | |
a3ad94ed | 467 | this->symtab_section_->set_link(ostrtab->out_shndx()); |
75f65a3e ILT |
468 | |
469 | // Create the section table header. | |
61ba1cf9 | 470 | Output_section_headers* oshdrs = this->create_shdrs(size, big_endian, &off); |
75f65a3e ILT |
471 | |
472 | file_header->set_section_info(oshdrs, shstrtab_section); | |
473 | ||
474 | // Now we know exactly where everything goes in the output file. | |
a3ad94ed | 475 | Output_data::layout_complete(); |
75f65a3e ILT |
476 | |
477 | return off; | |
478 | } | |
479 | ||
480 | // Return whether SEG1 should be before SEG2 in the output file. This | |
481 | // is based entirely on the segment type and flags. When this is | |
482 | // called the segment addresses has normally not yet been set. | |
483 | ||
484 | bool | |
485 | Layout::segment_precedes(const Output_segment* seg1, | |
486 | const Output_segment* seg2) | |
487 | { | |
488 | elfcpp::Elf_Word type1 = seg1->type(); | |
489 | elfcpp::Elf_Word type2 = seg2->type(); | |
490 | ||
491 | // The single PT_PHDR segment is required to precede any loadable | |
492 | // segment. We simply make it always first. | |
493 | if (type1 == elfcpp::PT_PHDR) | |
494 | { | |
a3ad94ed | 495 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
496 | return true; |
497 | } | |
498 | if (type2 == elfcpp::PT_PHDR) | |
499 | return false; | |
500 | ||
501 | // The single PT_INTERP segment is required to precede any loadable | |
502 | // segment. We simply make it always second. | |
503 | if (type1 == elfcpp::PT_INTERP) | |
504 | { | |
a3ad94ed | 505 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
506 | return true; |
507 | } | |
508 | if (type2 == elfcpp::PT_INTERP) | |
509 | return false; | |
510 | ||
511 | // We then put PT_LOAD segments before any other segments. | |
512 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
513 | return true; | |
514 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
515 | return false; | |
516 | ||
92e059d8 ILT |
517 | // We put the PT_TLS segment last, because that is where the dynamic |
518 | // linker expects to find it (this is just for efficiency; other | |
519 | // positions would also work correctly). | |
520 | if (type1 == elfcpp::PT_TLS && type2 != elfcpp::PT_TLS) | |
521 | return false; | |
522 | if (type2 == elfcpp::PT_TLS && type1 != elfcpp::PT_TLS) | |
523 | return true; | |
524 | ||
75f65a3e ILT |
525 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
526 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
527 | ||
528 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
529 | // by the numeric segment type and flags values. There should not | |
530 | // be more than one segment with the same type and flags. | |
531 | if (type1 != elfcpp::PT_LOAD) | |
532 | { | |
533 | if (type1 != type2) | |
534 | return type1 < type2; | |
a3ad94ed | 535 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
536 | return flags1 < flags2; |
537 | } | |
538 | ||
539 | // We sort PT_LOAD segments based on the flags. Readonly segments | |
540 | // come before writable segments. Then executable segments come | |
541 | // before non-executable segments. Then the unlikely case of a | |
542 | // non-readable segment comes before the normal case of a readable | |
543 | // segment. If there are multiple segments with the same type and | |
544 | // flags, we require that the address be set, and we sort by | |
545 | // virtual address and then physical address. | |
546 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) | |
547 | return (flags1 & elfcpp::PF_W) == 0; | |
548 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) | |
549 | return (flags1 & elfcpp::PF_X) != 0; | |
550 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
551 | return (flags1 & elfcpp::PF_R) == 0; | |
552 | ||
553 | uint64_t vaddr1 = seg1->vaddr(); | |
554 | uint64_t vaddr2 = seg2->vaddr(); | |
555 | if (vaddr1 != vaddr2) | |
556 | return vaddr1 < vaddr2; | |
557 | ||
558 | uint64_t paddr1 = seg1->paddr(); | |
559 | uint64_t paddr2 = seg2->paddr(); | |
a3ad94ed | 560 | gold_assert(paddr1 != paddr2); |
75f65a3e ILT |
561 | return paddr1 < paddr2; |
562 | } | |
563 | ||
ead1e424 ILT |
564 | // Set the file offsets of all the segments, and all the sections they |
565 | // contain. They have all been created. LOAD_SEG must be be laid out | |
566 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
567 | |
568 | off_t | |
ead1e424 ILT |
569 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
570 | unsigned int *pshndx) | |
75f65a3e ILT |
571 | { |
572 | // Sort them into the final order. | |
54dc6425 ILT |
573 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
574 | Layout::Compare_segments()); | |
575 | ||
75f65a3e ILT |
576 | // Find the PT_LOAD segments, and set their addresses and offsets |
577 | // and their section's addresses and offsets. | |
578 | uint64_t addr = target->text_segment_address(); | |
579 | off_t off = 0; | |
580 | bool was_readonly = false; | |
581 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
582 | p != this->segment_list_.end(); | |
583 | ++p) | |
584 | { | |
585 | if ((*p)->type() == elfcpp::PT_LOAD) | |
586 | { | |
587 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 588 | gold_unreachable(); |
75f65a3e ILT |
589 | load_seg = NULL; |
590 | ||
591 | // If the last segment was readonly, and this one is not, | |
592 | // then skip the address forward one page, maintaining the | |
593 | // same position within the page. This lets us store both | |
594 | // segments overlapping on a single page in the file, but | |
595 | // the loader will put them on different pages in memory. | |
596 | ||
597 | uint64_t orig_addr = addr; | |
598 | uint64_t orig_off = off; | |
599 | ||
600 | uint64_t aligned_addr = addr; | |
601 | uint64_t abi_pagesize = target->abi_pagesize(); | |
602 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
603 | { | |
ead1e424 | 604 | uint64_t align = (*p)->addralign(); |
75f65a3e | 605 | |
ead1e424 | 606 | addr = align_address(addr, align); |
75f65a3e ILT |
607 | aligned_addr = addr; |
608 | if ((addr & (abi_pagesize - 1)) != 0) | |
609 | addr = addr + abi_pagesize; | |
610 | } | |
611 | ||
ead1e424 | 612 | unsigned int shndx_hold = *pshndx; |
75f65a3e | 613 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
ead1e424 | 614 | uint64_t new_addr = (*p)->set_section_addresses(addr, &off, pshndx); |
75f65a3e ILT |
615 | |
616 | // Now that we know the size of this segment, we may be able | |
617 | // to save a page in memory, at the cost of wasting some | |
618 | // file space, by instead aligning to the start of a new | |
619 | // page. Here we use the real machine page size rather than | |
620 | // the ABI mandated page size. | |
621 | ||
622 | if (aligned_addr != addr) | |
623 | { | |
624 | uint64_t common_pagesize = target->common_pagesize(); | |
625 | uint64_t first_off = (common_pagesize | |
626 | - (aligned_addr | |
627 | & (common_pagesize - 1))); | |
628 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
629 | if (first_off > 0 | |
630 | && last_off > 0 | |
631 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
632 | != (new_addr & ~ (common_pagesize - 1))) | |
633 | && first_off + last_off <= common_pagesize) | |
634 | { | |
ead1e424 ILT |
635 | *pshndx = shndx_hold; |
636 | addr = align_address(aligned_addr, common_pagesize); | |
75f65a3e | 637 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
ead1e424 | 638 | new_addr = (*p)->set_section_addresses(addr, &off, pshndx); |
75f65a3e ILT |
639 | } |
640 | } | |
641 | ||
642 | addr = new_addr; | |
643 | ||
644 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
645 | was_readonly = true; | |
646 | } | |
647 | } | |
648 | ||
649 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
650 | // section's offsets. | |
651 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
652 | p != this->segment_list_.end(); | |
653 | ++p) | |
654 | { | |
655 | if ((*p)->type() != elfcpp::PT_LOAD) | |
656 | (*p)->set_offset(); | |
657 | } | |
658 | ||
659 | return off; | |
660 | } | |
661 | ||
662 | // Set the file offset of all the sections not associated with a | |
663 | // segment. | |
664 | ||
665 | off_t | |
ead1e424 | 666 | Layout::set_section_offsets(off_t off, unsigned int* pshndx) |
75f65a3e | 667 | { |
a3ad94ed ILT |
668 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
669 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
670 | ++p) |
671 | { | |
ead1e424 ILT |
672 | (*p)->set_out_shndx(*pshndx); |
673 | ++*pshndx; | |
61ba1cf9 ILT |
674 | if ((*p)->offset() != -1) |
675 | continue; | |
ead1e424 | 676 | off = align_address(off, (*p)->addralign()); |
75f65a3e ILT |
677 | (*p)->set_address(0, off); |
678 | off += (*p)->data_size(); | |
679 | } | |
680 | return off; | |
681 | } | |
682 | ||
683 | // Create the symbol table sections. | |
684 | ||
685 | void | |
61ba1cf9 | 686 | Layout::create_symtab_sections(int size, const Input_objects* input_objects, |
75f65a3e | 687 | Symbol_table* symtab, |
61ba1cf9 | 688 | off_t* poff, |
75f65a3e ILT |
689 | Output_section** postrtab) |
690 | { | |
61ba1cf9 ILT |
691 | int symsize; |
692 | unsigned int align; | |
693 | if (size == 32) | |
694 | { | |
695 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
696 | align = 4; | |
697 | } | |
698 | else if (size == 64) | |
699 | { | |
700 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
701 | align = 8; | |
702 | } | |
703 | else | |
a3ad94ed | 704 | gold_unreachable(); |
61ba1cf9 ILT |
705 | |
706 | off_t off = *poff; | |
ead1e424 | 707 | off = align_address(off, align); |
61ba1cf9 ILT |
708 | off_t startoff = off; |
709 | ||
710 | // Save space for the dummy symbol at the start of the section. We | |
711 | // never bother to write this out--it will just be left as zero. | |
712 | off += symsize; | |
c06b7b0b | 713 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 714 | |
a3ad94ed ILT |
715 | // Add STT_SECTION symbols for each Output section which needs one. |
716 | for (Section_list::iterator p = this->section_list_.begin(); | |
717 | p != this->section_list_.end(); | |
718 | ++p) | |
719 | { | |
720 | if (!(*p)->needs_symtab_index()) | |
721 | (*p)->set_symtab_index(-1U); | |
722 | else | |
723 | { | |
724 | (*p)->set_symtab_index(local_symbol_index); | |
725 | ++local_symbol_index; | |
726 | off += symsize; | |
727 | } | |
728 | } | |
729 | ||
f6ce93d6 ILT |
730 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
731 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
732 | ++p) |
733 | { | |
734 | Task_lock_obj<Object> tlo(**p); | |
c06b7b0b ILT |
735 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
736 | off, | |
737 | &this->sympool_); | |
738 | off += (index - local_symbol_index) * symsize; | |
739 | local_symbol_index = index; | |
75f65a3e ILT |
740 | } |
741 | ||
c06b7b0b | 742 | unsigned int local_symcount = local_symbol_index; |
a3ad94ed | 743 | gold_assert(local_symcount * symsize == off - startoff); |
61ba1cf9 | 744 | |
c06b7b0b | 745 | off = symtab->finalize(local_symcount, off, &this->sympool_); |
75f65a3e | 746 | |
61ba1cf9 ILT |
747 | this->sympool_.set_string_offsets(); |
748 | ||
f0641a0b | 749 | const char* symtab_name = this->namepool_.add(".symtab", NULL); |
a3ad94ed ILT |
750 | Output_section* osymtab = this->make_output_section(symtab_name, |
751 | elfcpp::SHT_SYMTAB, | |
752 | 0); | |
753 | this->symtab_section_ = osymtab; | |
754 | ||
755 | Output_section_data* pos = new Output_data_space(off - startoff, | |
756 | align); | |
757 | osymtab->add_output_section_data(pos); | |
61ba1cf9 | 758 | |
f0641a0b | 759 | const char* strtab_name = this->namepool_.add(".strtab", NULL); |
a3ad94ed ILT |
760 | Output_section* ostrtab = this->make_output_section(strtab_name, |
761 | elfcpp::SHT_STRTAB, | |
762 | 0); | |
763 | ||
764 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); | |
765 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 ILT |
766 | |
767 | osymtab->set_address(0, startoff); | |
61ba1cf9 ILT |
768 | osymtab->set_info(local_symcount); |
769 | osymtab->set_entsize(symsize); | |
61ba1cf9 ILT |
770 | |
771 | *poff = off; | |
61ba1cf9 | 772 | *postrtab = ostrtab; |
75f65a3e ILT |
773 | } |
774 | ||
775 | // Create the .shstrtab section, which holds the names of the | |
776 | // sections. At the time this is called, we have created all the | |
777 | // output sections except .shstrtab itself. | |
778 | ||
779 | Output_section* | |
780 | Layout::create_shstrtab() | |
781 | { | |
782 | // FIXME: We don't need to create a .shstrtab section if we are | |
783 | // stripping everything. | |
784 | ||
f0641a0b | 785 | const char* name = this->namepool_.add(".shstrtab", NULL); |
75f65a3e | 786 | |
61ba1cf9 ILT |
787 | this->namepool_.set_string_offsets(); |
788 | ||
a3ad94ed | 789 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 790 | |
a3ad94ed ILT |
791 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
792 | os->add_output_section_data(posd); | |
75f65a3e ILT |
793 | |
794 | return os; | |
795 | } | |
796 | ||
797 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
798 | // offset. | |
799 | ||
800 | Output_section_headers* | |
61ba1cf9 | 801 | Layout::create_shdrs(int size, bool big_endian, off_t* poff) |
75f65a3e ILT |
802 | { |
803 | Output_section_headers* oshdrs; | |
61ba1cf9 | 804 | oshdrs = new Output_section_headers(size, big_endian, this->segment_list_, |
a3ad94ed | 805 | this->unattached_section_list_, |
61ba1cf9 | 806 | &this->namepool_); |
ead1e424 | 807 | off_t off = align_address(*poff, oshdrs->addralign()); |
75f65a3e | 808 | oshdrs->set_address(0, off); |
61ba1cf9 ILT |
809 | off += oshdrs->data_size(); |
810 | *poff = off; | |
811 | this->special_output_list_.push_back(oshdrs); | |
75f65a3e | 812 | return oshdrs; |
54dc6425 ILT |
813 | } |
814 | ||
dbe717ef ILT |
815 | // Create the dynamic symbol table. |
816 | ||
817 | void | |
a3ad94ed ILT |
818 | Layout::create_dynamic_symtab(const Target* target, Output_data_dynamic* odyn, |
819 | Symbol_table* symtab) | |
dbe717ef | 820 | { |
a3ad94ed ILT |
821 | // Count all the symbols in the dynamic symbol table, and set the |
822 | // dynamic symbol indexes. | |
dbe717ef | 823 | |
a3ad94ed ILT |
824 | // Skip symbol 0, which is always all zeroes. |
825 | unsigned int index = 1; | |
dbe717ef | 826 | |
a3ad94ed ILT |
827 | // Add STT_SECTION symbols for each Output section which needs one. |
828 | for (Section_list::iterator p = this->section_list_.begin(); | |
829 | p != this->section_list_.end(); | |
830 | ++p) | |
831 | { | |
832 | if (!(*p)->needs_dynsym_index()) | |
833 | (*p)->set_dynsym_index(-1U); | |
834 | else | |
835 | { | |
836 | (*p)->set_dynsym_index(index); | |
837 | ++index; | |
838 | } | |
839 | } | |
840 | ||
841 | // FIXME: Some targets apparently require local symbols in the | |
842 | // dynamic symbol table. Here is where we will have to count them, | |
843 | // and set the dynamic symbol indexes, and add the names to | |
844 | // this->dynpool_. | |
845 | ||
846 | unsigned int local_symcount = index; | |
847 | ||
848 | std::vector<Symbol*> dynamic_symbols; | |
849 | ||
850 | // FIXME: We have to tell set_dynsym_indexes whether the | |
851 | // -E/--export-dynamic option was used. | |
852 | index = symtab->set_dynsym_indexes(index, &dynamic_symbols, | |
853 | &this->dynpool_); | |
854 | ||
855 | int symsize; | |
856 | unsigned int align; | |
857 | const int size = target->get_size(); | |
858 | if (size == 32) | |
859 | { | |
860 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
861 | align = 4; | |
862 | } | |
863 | else if (size == 64) | |
864 | { | |
865 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
866 | align = 8; | |
867 | } | |
868 | else | |
869 | gold_unreachable(); | |
870 | ||
871 | const char* dynsym_name = this->namepool_.add(".dynsym", NULL); | |
872 | Output_section* dynsym = this->make_output_section(dynsym_name, | |
873 | elfcpp::SHT_DYNSYM, | |
874 | elfcpp::SHF_ALLOC); | |
875 | ||
876 | Output_section_data* odata = new Output_data_space(index * symsize, | |
877 | align); | |
878 | dynsym->add_output_section_data(odata); | |
879 | ||
880 | dynsym->set_info(local_symcount); | |
881 | dynsym->set_entsize(symsize); | |
882 | dynsym->set_addralign(align); | |
883 | ||
884 | this->dynsym_section_ = dynsym; | |
885 | ||
886 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); | |
887 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
888 | ||
889 | const char* dynstr_name = this->namepool_.add(".dynstr", NULL); | |
890 | Output_section* dynstr = this->make_output_section(dynstr_name, | |
891 | elfcpp::SHT_STRTAB, | |
892 | elfcpp::SHF_ALLOC); | |
893 | ||
894 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
895 | dynstr->add_output_section_data(strdata); | |
896 | ||
897 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); | |
898 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
899 | ||
900 | // FIXME: We need an option to create a GNU hash table. | |
901 | ||
902 | unsigned char* phash; | |
903 | unsigned int hashlen; | |
904 | Dynobj::create_elf_hash_table(target, dynamic_symbols, local_symcount, | |
905 | &phash, &hashlen); | |
906 | ||
907 | const char* hash_name = this->namepool_.add(".hash", NULL); | |
908 | Output_section* hashsec = this->make_output_section(hash_name, | |
909 | elfcpp::SHT_HASH, | |
910 | elfcpp::SHF_ALLOC); | |
911 | ||
912 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
913 | hashlen, | |
914 | align); | |
915 | hashsec->add_output_section_data(hashdata); | |
916 | ||
917 | hashsec->set_entsize(4); | |
918 | // FIXME: .hash should link to .dynsym. | |
919 | ||
920 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
dbe717ef ILT |
921 | } |
922 | ||
923 | // Create the .interp section and PT_INTERP segment. | |
924 | ||
925 | void | |
926 | Layout::create_interp(const Target* target) | |
927 | { | |
928 | const char* interp = this->options_.dynamic_linker(); | |
929 | if (interp == NULL) | |
930 | { | |
931 | interp = target->dynamic_linker(); | |
a3ad94ed | 932 | gold_assert(interp != NULL); |
dbe717ef ILT |
933 | } |
934 | ||
935 | size_t len = strlen(interp) + 1; | |
936 | ||
937 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
938 | ||
939 | const char* interp_name = this->namepool_.add(".interp", NULL); | |
940 | Output_section* osec = this->make_output_section(interp_name, | |
941 | elfcpp::SHT_PROGBITS, | |
942 | elfcpp::SHF_ALLOC); | |
943 | osec->add_output_section_data(odata); | |
944 | ||
945 | Output_segment* oseg = new Output_segment(elfcpp::PT_INTERP, elfcpp::PF_R); | |
946 | this->segment_list_.push_back(oseg); | |
947 | oseg->add_initial_output_section(osec, elfcpp::PF_R); | |
948 | } | |
949 | ||
a3ad94ed ILT |
950 | // Finish the .dynamic section and PT_DYNAMIC segment. |
951 | ||
952 | void | |
953 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
954 | const Symbol_table* symtab, | |
955 | Output_data_dynamic* odyn) | |
956 | { | |
957 | this->dynamic_section_->add_output_section_data(odyn); | |
958 | ||
959 | Output_segment* oseg = new Output_segment(elfcpp::PT_DYNAMIC, | |
960 | elfcpp::PF_R | elfcpp::PF_W); | |
961 | this->segment_list_.push_back(oseg); | |
962 | oseg->add_initial_output_section(this->dynamic_section_, | |
963 | elfcpp::PF_R | elfcpp::PF_W); | |
964 | ||
965 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); | |
966 | p != input_objects->dynobj_end(); | |
967 | ++p) | |
968 | { | |
969 | // FIXME: Handle --as-needed. | |
970 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
971 | } | |
972 | ||
973 | // FIXME: Support --init and --fini. | |
974 | Symbol* sym = symtab->lookup("_init"); | |
975 | if (sym != NULL && sym->is_defined() && !sym->is_defined_in_dynobj()) | |
976 | odyn->add_symbol(elfcpp::DT_INIT, sym); | |
977 | ||
978 | sym = symtab->lookup("_fini"); | |
979 | if (sym != NULL && sym->is_defined() && !sym->is_defined_in_dynobj()) | |
980 | odyn->add_symbol(elfcpp::DT_FINI, sym); | |
981 | ||
982 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
983 | } | |
984 | ||
a2fb1b05 ILT |
985 | // The mapping of .gnu.linkonce section names to real section names. |
986 | ||
ead1e424 | 987 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
a2fb1b05 ILT |
988 | const Layout::Linkonce_mapping Layout::linkonce_mapping[] = |
989 | { | |
990 | MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d". | |
991 | MAPPING_INIT("t", ".text"), | |
992 | MAPPING_INIT("r", ".rodata"), | |
993 | MAPPING_INIT("d", ".data"), | |
994 | MAPPING_INIT("b", ".bss"), | |
995 | MAPPING_INIT("s", ".sdata"), | |
996 | MAPPING_INIT("sb", ".sbss"), | |
997 | MAPPING_INIT("s2", ".sdata2"), | |
998 | MAPPING_INIT("sb2", ".sbss2"), | |
999 | MAPPING_INIT("wi", ".debug_info"), | |
1000 | MAPPING_INIT("td", ".tdata"), | |
1001 | MAPPING_INIT("tb", ".tbss"), | |
1002 | MAPPING_INIT("lr", ".lrodata"), | |
1003 | MAPPING_INIT("l", ".ldata"), | |
1004 | MAPPING_INIT("lb", ".lbss"), | |
1005 | }; | |
1006 | #undef MAPPING_INIT | |
1007 | ||
1008 | const int Layout::linkonce_mapping_count = | |
1009 | sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]); | |
1010 | ||
1011 | // Return the name of the output section to use for a .gnu.linkonce | |
1012 | // section. This is based on the default ELF linker script of the old | |
1013 | // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo" | |
ead1e424 ILT |
1014 | // to ".text". Set *PLEN to the length of the name. *PLEN is |
1015 | // initialized to the length of NAME. | |
a2fb1b05 ILT |
1016 | |
1017 | const char* | |
ead1e424 | 1018 | Layout::linkonce_output_name(const char* name, size_t *plen) |
a2fb1b05 ILT |
1019 | { |
1020 | const char* s = name + sizeof(".gnu.linkonce") - 1; | |
1021 | if (*s != '.') | |
1022 | return name; | |
1023 | ++s; | |
1024 | const Linkonce_mapping* plm = linkonce_mapping; | |
1025 | for (int i = 0; i < linkonce_mapping_count; ++i, ++plm) | |
1026 | { | |
1027 | if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.') | |
ead1e424 ILT |
1028 | { |
1029 | *plen = plm->tolen; | |
1030 | return plm->to; | |
1031 | } | |
a2fb1b05 ILT |
1032 | } |
1033 | return name; | |
1034 | } | |
1035 | ||
ead1e424 ILT |
1036 | // Choose the output section name to use given an input section name. |
1037 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
1038 | // length of NAME. | |
1039 | ||
1040 | const char* | |
1041 | Layout::output_section_name(const char* name, size_t* plen) | |
1042 | { | |
1043 | if (Layout::is_linkonce(name)) | |
1044 | { | |
1045 | // .gnu.linkonce sections are laid out as though they were named | |
1046 | // for the sections are placed into. | |
1047 | return Layout::linkonce_output_name(name, plen); | |
1048 | } | |
1049 | ||
1050 | // If the section name has no '.', or only an initial '.', we use | |
1051 | // the name unchanged (i.e., ".text" is unchanged). | |
1052 | ||
1053 | // Otherwise, if the section name does not include ".rel", we drop | |
1054 | // the last '.' and everything that follows (i.e., ".text.XXX" | |
1055 | // becomes ".text"). | |
1056 | ||
1057 | // Otherwise, if the section name has zero or one '.' after the | |
1058 | // ".rel", we use the name unchanged (i.e., ".rel.text" is | |
1059 | // unchanged). | |
1060 | ||
1061 | // Otherwise, we drop the last '.' and everything that follows | |
1062 | // (i.e., ".rel.text.XXX" becomes ".rel.text"). | |
1063 | ||
1064 | const char* s = name; | |
1065 | if (*s == '.') | |
1066 | ++s; | |
1067 | const char* sdot = strchr(s, '.'); | |
1068 | if (sdot == NULL) | |
1069 | return name; | |
1070 | ||
1071 | const char* srel = strstr(s, ".rel"); | |
1072 | if (srel == NULL) | |
1073 | { | |
1074 | *plen = sdot - name; | |
1075 | return name; | |
1076 | } | |
1077 | ||
1078 | sdot = strchr(srel + 1, '.'); | |
1079 | if (sdot == NULL) | |
1080 | return name; | |
1081 | sdot = strchr(sdot + 1, '.'); | |
1082 | if (sdot == NULL) | |
1083 | return name; | |
1084 | ||
1085 | *plen = sdot - name; | |
1086 | return name; | |
1087 | } | |
1088 | ||
a2fb1b05 ILT |
1089 | // Record the signature of a comdat section, and return whether to |
1090 | // include it in the link. If GROUP is true, this is a regular | |
1091 | // section group. If GROUP is false, this is a group signature | |
1092 | // derived from the name of a linkonce section. We want linkonce | |
1093 | // signatures and group signatures to block each other, but we don't | |
1094 | // want a linkonce signature to block another linkonce signature. | |
1095 | ||
1096 | bool | |
1097 | Layout::add_comdat(const char* signature, bool group) | |
1098 | { | |
1099 | std::string sig(signature); | |
1100 | std::pair<Signatures::iterator, bool> ins( | |
ead1e424 | 1101 | this->signatures_.insert(std::make_pair(sig, group))); |
a2fb1b05 ILT |
1102 | |
1103 | if (ins.second) | |
1104 | { | |
1105 | // This is the first time we've seen this signature. | |
1106 | return true; | |
1107 | } | |
1108 | ||
1109 | if (ins.first->second) | |
1110 | { | |
1111 | // We've already seen a real section group with this signature. | |
1112 | return false; | |
1113 | } | |
1114 | else if (group) | |
1115 | { | |
1116 | // This is a real section group, and we've already seen a | |
1117 | // linkonce section with tihs signature. Record that we've seen | |
1118 | // a section group, and don't include this section group. | |
1119 | ins.first->second = true; | |
1120 | return false; | |
1121 | } | |
1122 | else | |
1123 | { | |
1124 | // We've already seen a linkonce section and this is a linkonce | |
1125 | // section. These don't block each other--this may be the same | |
1126 | // symbol name with different section types. | |
1127 | return true; | |
1128 | } | |
1129 | } | |
1130 | ||
61ba1cf9 ILT |
1131 | // Write out data not associated with a section or the symbol table. |
1132 | ||
1133 | void | |
a3ad94ed ILT |
1134 | Layout::write_data(const Symbol_table* symtab, const Target* target, |
1135 | Output_file* of) const | |
61ba1cf9 | 1136 | { |
a3ad94ed ILT |
1137 | const Output_section* symtab_section = this->symtab_section_; |
1138 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1139 | p != this->section_list_.end(); | |
1140 | ++p) | |
1141 | { | |
1142 | if ((*p)->needs_symtab_index()) | |
1143 | { | |
1144 | gold_assert(symtab_section != NULL); | |
1145 | unsigned int index = (*p)->symtab_index(); | |
1146 | gold_assert(index > 0 && index != -1U); | |
1147 | off_t off = (symtab_section->offset() | |
1148 | + index * symtab_section->entsize()); | |
1149 | symtab->write_section_symbol(target, *p, of, off); | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | const Output_section* dynsym_section = this->dynsym_section_; | |
1154 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1155 | p != this->section_list_.end(); | |
1156 | ++p) | |
1157 | { | |
1158 | if ((*p)->needs_dynsym_index()) | |
1159 | { | |
1160 | gold_assert(dynsym_section != NULL); | |
1161 | unsigned int index = (*p)->dynsym_index(); | |
1162 | gold_assert(index > 0 && index != -1U); | |
1163 | off_t off = (dynsym_section->offset() | |
1164 | + index * dynsym_section->entsize()); | |
1165 | symtab->write_section_symbol(target, *p, of, off); | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | // Write out the Output_sections. Most won't have anything to | |
1170 | // write, since most of the data will come from input sections which | |
1171 | // are handled elsewhere. But some Output_sections do have | |
1172 | // Output_data. | |
1173 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1174 | p != this->section_list_.end(); | |
1175 | ++p) | |
1176 | (*p)->write(of); | |
1177 | ||
1178 | // Write out the Output_data which are not in an Output_section. | |
61ba1cf9 ILT |
1179 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
1180 | p != this->special_output_list_.end(); | |
1181 | ++p) | |
1182 | (*p)->write(of); | |
1183 | } | |
1184 | ||
1185 | // Write_data_task methods. | |
1186 | ||
1187 | // We can always run this task. | |
1188 | ||
1189 | Task::Is_runnable_type | |
1190 | Write_data_task::is_runnable(Workqueue*) | |
1191 | { | |
1192 | return IS_RUNNABLE; | |
1193 | } | |
1194 | ||
1195 | // We need to unlock FINAL_BLOCKER when finished. | |
1196 | ||
1197 | Task_locker* | |
1198 | Write_data_task::locks(Workqueue* workqueue) | |
1199 | { | |
1200 | return new Task_locker_block(*this->final_blocker_, workqueue); | |
1201 | } | |
1202 | ||
1203 | // Run the task--write out the data. | |
1204 | ||
1205 | void | |
1206 | Write_data_task::run(Workqueue*) | |
1207 | { | |
a3ad94ed | 1208 | this->layout_->write_data(this->symtab_, this->target_, this->of_); |
61ba1cf9 ILT |
1209 | } |
1210 | ||
1211 | // Write_symbols_task methods. | |
1212 | ||
1213 | // We can always run this task. | |
1214 | ||
1215 | Task::Is_runnable_type | |
1216 | Write_symbols_task::is_runnable(Workqueue*) | |
1217 | { | |
1218 | return IS_RUNNABLE; | |
1219 | } | |
1220 | ||
1221 | // We need to unlock FINAL_BLOCKER when finished. | |
1222 | ||
1223 | Task_locker* | |
1224 | Write_symbols_task::locks(Workqueue* workqueue) | |
1225 | { | |
1226 | return new Task_locker_block(*this->final_blocker_, workqueue); | |
1227 | } | |
1228 | ||
1229 | // Run the task--write out the symbols. | |
1230 | ||
1231 | void | |
1232 | Write_symbols_task::run(Workqueue*) | |
1233 | { | |
1234 | this->symtab_->write_globals(this->target_, this->sympool_, this->of_); | |
1235 | } | |
1236 | ||
92e059d8 | 1237 | // Close_task_runner methods. |
61ba1cf9 ILT |
1238 | |
1239 | // Run the task--close the file. | |
1240 | ||
1241 | void | |
92e059d8 | 1242 | Close_task_runner::run(Workqueue*) |
61ba1cf9 ILT |
1243 | { |
1244 | this->of_->close(); | |
1245 | } | |
1246 | ||
a2fb1b05 ILT |
1247 | // Instantiate the templates we need. We could use the configure |
1248 | // script to restrict this to only the ones for implemented targets. | |
1249 | ||
1250 | template | |
1251 | Output_section* | |
f6ce93d6 | 1252 | Layout::layout<32, false>(Relobj* object, unsigned int shndx, const char* name, |
a2fb1b05 ILT |
1253 | const elfcpp::Shdr<32, false>& shdr, off_t*); |
1254 | ||
1255 | template | |
1256 | Output_section* | |
f6ce93d6 | 1257 | Layout::layout<32, true>(Relobj* object, unsigned int shndx, const char* name, |
a2fb1b05 ILT |
1258 | const elfcpp::Shdr<32, true>& shdr, off_t*); |
1259 | ||
1260 | template | |
1261 | Output_section* | |
f6ce93d6 | 1262 | Layout::layout<64, false>(Relobj* object, unsigned int shndx, const char* name, |
a2fb1b05 ILT |
1263 | const elfcpp::Shdr<64, false>& shdr, off_t*); |
1264 | ||
1265 | template | |
1266 | Output_section* | |
f6ce93d6 | 1267 | Layout::layout<64, true>(Relobj* object, unsigned int shndx, const char* name, |
a2fb1b05 ILT |
1268 | const elfcpp::Shdr<64, true>& shdr, off_t*); |
1269 | ||
1270 | ||
1271 | } // End namespace gold. |