Commit | Line | Data |
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bae7f79e ILT |
1 | // object.cc -- support for an object file for linking in gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include <cerrno> | |
6 | #include <cstring> | |
7 | #include <cassert> | |
8 | ||
9 | #include "object.h" | |
14bfc3f5 | 10 | #include "target-select.h" |
a2fb1b05 | 11 | #include "layout.h" |
61ba1cf9 | 12 | #include "output.h" |
bae7f79e ILT |
13 | |
14 | namespace gold | |
15 | { | |
16 | ||
17 | // Class Object. | |
18 | ||
19 | const unsigned char* | |
20 | Object::get_view(off_t start, off_t size) | |
21 | { | |
22 | return this->input_file_->file().get_view(start + this->offset_, size); | |
23 | } | |
24 | ||
25 | void | |
26 | Object::read(off_t start, off_t size, void* p) | |
27 | { | |
28 | this->input_file_->file().read(start + this->offset_, size, p); | |
29 | } | |
30 | ||
31 | File_view* | |
32 | Object::get_lasting_view(off_t start, off_t size) | |
33 | { | |
34 | return this->input_file_->file().get_lasting_view(start + this->offset_, | |
35 | size); | |
36 | } | |
37 | ||
38 | // Class Sized_object. | |
39 | ||
40 | template<int size, bool big_endian> | |
41 | Sized_object<size, big_endian>::Sized_object( | |
42 | const std::string& name, | |
43 | Input_file* input_file, | |
44 | off_t offset, | |
45 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
14bfc3f5 | 46 | : Object(name, input_file, false, offset), |
12e14209 | 47 | section_headers_(NULL), |
bae7f79e | 48 | flags_(ehdr.get_e_flags()), |
bae7f79e | 49 | shoff_(ehdr.get_e_shoff()), |
bae7f79e | 50 | shstrndx_(0), |
14bfc3f5 | 51 | symtab_shnum_(0), |
61ba1cf9 ILT |
52 | local_symbol_count_(0), |
53 | output_local_symbol_count_(0), | |
75f65a3e | 54 | symbols_(NULL), |
61ba1cf9 ILT |
55 | local_symbol_offset_(0), |
56 | values_(NULL) | |
bae7f79e | 57 | { |
a2fb1b05 | 58 | if (ehdr.get_e_ehsize() != This::ehdr_size) |
bae7f79e ILT |
59 | { |
60 | fprintf(stderr, _("%s: %s: bad e_ehsize field (%d != %d)\n"), | |
61 | program_name, this->name().c_str(), ehdr.get_e_ehsize(), | |
a2fb1b05 | 62 | This::ehdr_size); |
bae7f79e ILT |
63 | gold_exit(false); |
64 | } | |
a2fb1b05 | 65 | if (ehdr.get_e_shentsize() != This::shdr_size) |
bae7f79e ILT |
66 | { |
67 | fprintf(stderr, _("%s: %s: bad e_shentsize field (%d != %d)\n"), | |
68 | program_name, this->name().c_str(), ehdr.get_e_shentsize(), | |
a2fb1b05 | 69 | This::shdr_size); |
bae7f79e ILT |
70 | gold_exit(false); |
71 | } | |
72 | } | |
73 | ||
74 | template<int size, bool big_endian> | |
75 | Sized_object<size, big_endian>::~Sized_object() | |
76 | { | |
77 | } | |
78 | ||
75f65a3e ILT |
79 | // Read the section header for section SHNUM. |
80 | ||
81 | template<int size, bool big_endian> | |
82 | const unsigned char* | |
83 | Sized_object<size, big_endian>::section_header(unsigned int shnum) | |
84 | { | |
61ba1cf9 | 85 | assert(shnum < this->shnum()); |
75f65a3e ILT |
86 | off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size; |
87 | return this->get_view(symtabshdroff, This::shdr_size); | |
88 | } | |
89 | ||
92e059d8 ILT |
90 | // Return the name of section SHNUM. |
91 | ||
92 | template<int size, bool big_endian> | |
93 | std::string | |
94 | Sized_object<size, big_endian>::do_section_name(unsigned int shnum) | |
95 | { | |
96 | Task_lock_obj<Object> tl(*this); | |
97 | ||
98 | // Read the section names. | |
99 | typename This::Shdr shdrnames(this->section_header(this->shstrndx_)); | |
100 | const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(), | |
101 | shdrnames.get_sh_size()); | |
102 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
103 | ||
104 | typename This::Shdr shdr(this->section_header(shnum)); | |
105 | if (shdr.get_sh_name() >= shdrnames.get_sh_size()) | |
106 | { | |
107 | fprintf(stderr, | |
108 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
109 | program_name, this->name().c_str(), shnum, | |
110 | static_cast<unsigned long>(shdr.get_sh_name())); | |
111 | gold_exit(false); | |
112 | } | |
113 | ||
114 | return std::string(pnames + shdr.get_sh_name()); | |
115 | } | |
116 | ||
bae7f79e ILT |
117 | // Set up an object file bsaed on the file header. This sets up the |
118 | // target and reads the section information. | |
119 | ||
120 | template<int size, bool big_endian> | |
121 | void | |
122 | Sized_object<size, big_endian>::setup( | |
123 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
124 | { | |
a2fb1b05 ILT |
125 | int machine = ehdr.get_e_machine(); |
126 | Target* target = select_target(machine, size, big_endian, | |
127 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
128 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
14bfc3f5 ILT |
129 | if (target == NULL) |
130 | { | |
131 | fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"), | |
a2fb1b05 | 132 | program_name, this->name().c_str(), machine); |
14bfc3f5 ILT |
133 | gold_exit(false); |
134 | } | |
135 | this->set_target(target); | |
12e14209 | 136 | |
bae7f79e ILT |
137 | unsigned int shnum = ehdr.get_e_shnum(); |
138 | unsigned int shstrndx = ehdr.get_e_shstrndx(); | |
139 | if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX) | |
140 | && this->shoff_ != 0) | |
141 | { | |
75f65a3e | 142 | typename This::Shdr shdr(this->section_header(0)); |
bae7f79e ILT |
143 | if (shnum == 0) |
144 | shnum = shdr.get_sh_size(); | |
145 | if (shstrndx == elfcpp::SHN_XINDEX) | |
146 | shstrndx = shdr.get_sh_link(); | |
147 | } | |
a2fb1b05 | 148 | this->set_shnum(shnum); |
bae7f79e ILT |
149 | this->shstrndx_ = shstrndx; |
150 | ||
151 | if (shnum == 0) | |
152 | return; | |
153 | ||
12e14209 ILT |
154 | // We store the section headers in a File_view until do_read_symbols. |
155 | this->section_headers_ = this->get_lasting_view(this->shoff_, | |
156 | shnum * This::shdr_size); | |
157 | ||
158 | // Find the SHT_SYMTAB section. The ELF standard says that maybe in | |
159 | // the future there can be more than one SHT_SYMTAB section. Until | |
160 | // somebody figures out how that could work, we assume there is only | |
161 | // one. | |
162 | const unsigned char* p = this->section_headers_->data(); | |
163 | ||
bae7f79e | 164 | // Skip the first section, which is always empty. |
a2fb1b05 | 165 | p += This::shdr_size; |
12e14209 | 166 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) |
bae7f79e | 167 | { |
75f65a3e | 168 | typename This::Shdr shdr(p); |
bae7f79e ILT |
169 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
170 | { | |
171 | this->symtab_shnum_ = i; | |
172 | break; | |
173 | } | |
bae7f79e ILT |
174 | } |
175 | } | |
176 | ||
12e14209 | 177 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
178 | |
179 | template<int size, bool big_endian> | |
12e14209 ILT |
180 | void |
181 | Sized_object<size, big_endian>::do_read_symbols(Read_symbols_data* sd) | |
bae7f79e | 182 | { |
12e14209 ILT |
183 | // Transfer our view of the section headers to SD. |
184 | sd->section_headers = this->section_headers_; | |
185 | this->section_headers_ = NULL; | |
186 | ||
187 | // Read the section names. | |
188 | const unsigned char* pshdrs = sd->section_headers->data(); | |
189 | const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size; | |
190 | typename This::Shdr shdrnames(pshdrnames); | |
191 | sd->section_names_size = shdrnames.get_sh_size(); | |
192 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), | |
193 | sd->section_names_size); | |
194 | ||
bae7f79e ILT |
195 | if (this->symtab_shnum_ == 0) |
196 | { | |
197 | // No symbol table. Weird but legal. | |
12e14209 ILT |
198 | sd->symbols = NULL; |
199 | sd->symbols_size = 0; | |
200 | sd->symbol_names = NULL; | |
201 | sd->symbol_names_size = 0; | |
202 | return; | |
bae7f79e ILT |
203 | } |
204 | ||
12e14209 ILT |
205 | // Get the symbol table section header. |
206 | typename This::Shdr symtabshdr(pshdrs | |
207 | + this->symtab_shnum_ * This::shdr_size); | |
bae7f79e ILT |
208 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
209 | ||
75f65a3e ILT |
210 | // We only need the external symbols. |
211 | const int sym_size = This::sym_size; | |
92e059d8 ILT |
212 | const unsigned int loccount = symtabshdr.get_sh_info(); |
213 | this->local_symbol_count_ = loccount; | |
214 | off_t locsize = loccount * sym_size; | |
75f65a3e ILT |
215 | off_t extoff = symtabshdr.get_sh_offset() + locsize; |
216 | off_t extsize = symtabshdr.get_sh_size() - locsize; | |
217 | ||
bae7f79e | 218 | // Read the symbol table. |
75f65a3e | 219 | File_view* fvsymtab = this->get_lasting_view(extoff, extsize); |
bae7f79e ILT |
220 | |
221 | // Read the section header for the symbol names. | |
92e059d8 | 222 | unsigned int shnum = this->shnum(); |
bae7f79e | 223 | unsigned int strtab_shnum = symtabshdr.get_sh_link(); |
92e059d8 | 224 | if (strtab_shnum == 0 || strtab_shnum >= shnum) |
bae7f79e ILT |
225 | { |
226 | fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"), | |
227 | program_name, this->name().c_str(), strtab_shnum); | |
228 | gold_exit(false); | |
229 | } | |
92e059d8 | 230 | typename This::Shdr strtabshdr(pshdrs + strtab_shnum * This::shdr_size); |
bae7f79e ILT |
231 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
232 | { | |
233 | fprintf(stderr, | |
234 | _("%s: %s: symbol table name section has wrong type: %u\n"), | |
235 | program_name, this->name().c_str(), | |
236 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
237 | gold_exit(false); | |
238 | } | |
239 | ||
240 | // Read the symbol names. | |
241 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
242 | strtabshdr.get_sh_size()); | |
243 | ||
12e14209 ILT |
244 | sd->symbols = fvsymtab; |
245 | sd->symbols_size = extsize; | |
246 | sd->symbol_names = fvstrtab; | |
247 | sd->symbol_names_size = strtabshdr.get_sh_size(); | |
a2fb1b05 ILT |
248 | } |
249 | ||
250 | // Return whether to include a section group in the link. LAYOUT is | |
251 | // used to keep track of which section groups we have already seen. | |
252 | // INDEX is the index of the section group and SHDR is the section | |
253 | // header. If we do not want to include this group, we set bits in | |
254 | // OMIT for each section which should be discarded. | |
255 | ||
256 | template<int size, bool big_endian> | |
257 | bool | |
258 | Sized_object<size, big_endian>::include_section_group( | |
259 | Layout* layout, | |
260 | unsigned int index, | |
261 | const elfcpp::Shdr<size, big_endian>& shdr, | |
262 | std::vector<bool>* omit) | |
263 | { | |
264 | // Read the section contents. | |
265 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
266 | shdr.get_sh_size()); | |
267 | const elfcpp::Elf_Word* pword = | |
268 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
269 | ||
270 | // The first word contains flags. We only care about COMDAT section | |
271 | // groups. Other section groups are always included in the link | |
272 | // just like ordinary sections. | |
273 | elfcpp::Elf_Word flags = elfcpp::read_elf_word<big_endian>(pword); | |
274 | if ((flags & elfcpp::GRP_COMDAT) == 0) | |
275 | return true; | |
276 | ||
277 | // Look up the group signature, which is the name of a symbol. This | |
278 | // is a lot of effort to go to to read a string. Why didn't they | |
279 | // just use the name of the SHT_GROUP section as the group | |
280 | // signature? | |
281 | ||
282 | // Get the appropriate symbol table header (this will normally be | |
283 | // the single SHT_SYMTAB section, but in principle it need not be). | |
284 | if (shdr.get_sh_link() >= this->shnum()) | |
285 | { | |
286 | fprintf(stderr, _("%s: %s: section group %u link %u out of range\n"), | |
287 | program_name, this->name().c_str(), index, shdr.get_sh_link()); | |
288 | gold_exit(false); | |
289 | } | |
75f65a3e ILT |
290 | |
291 | typename This::Shdr symshdr(this->section_header(shdr.get_sh_link())); | |
a2fb1b05 ILT |
292 | |
293 | // Read the symbol table entry. | |
294 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
295 | { | |
296 | fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"), | |
297 | program_name, this->name().c_str(), index, shdr.get_sh_info()); | |
298 | gold_exit(false); | |
299 | } | |
300 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
301 | const unsigned char* psym = this->get_view(symoff, This::sym_size); | |
302 | elfcpp::Sym<size, big_endian> sym(psym); | |
303 | ||
304 | // Read the section header for the symbol table names. | |
305 | if (symshdr.get_sh_link() >= this->shnum()) | |
306 | { | |
307 | fprintf(stderr, _("%s; %s: symtab section %u link %u out of range\n"), | |
308 | program_name, this->name().c_str(), shdr.get_sh_link(), | |
309 | symshdr.get_sh_link()); | |
310 | gold_exit(false); | |
311 | } | |
75f65a3e ILT |
312 | |
313 | typename This::Shdr symnamehdr(this->section_header(symshdr.get_sh_link())); | |
a2fb1b05 ILT |
314 | |
315 | // Read the symbol table names. | |
316 | const unsigned char *psymnamesu = this->get_view(symnamehdr.get_sh_offset(), | |
317 | symnamehdr.get_sh_size()); | |
318 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); | |
319 | ||
320 | // Get the section group signature. | |
321 | if (sym.get_st_name() >= symnamehdr.get_sh_size()) | |
322 | { | |
323 | fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"), | |
324 | program_name, this->name().c_str(), shdr.get_sh_info(), | |
325 | sym.get_st_name()); | |
326 | gold_exit(false); | |
327 | } | |
328 | ||
329 | const char* signature = psymnames + sym.get_st_name(); | |
330 | ||
331 | // Record this section group, and see whether we've already seen one | |
332 | // with the same signature. | |
333 | if (layout->add_comdat(signature, true)) | |
334 | return true; | |
335 | ||
336 | // This is a duplicate. We want to discard the sections in this | |
337 | // group. | |
338 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
339 | for (size_t i = 1; i < count; ++i) | |
340 | { | |
341 | elfcpp::Elf_Word secnum = elfcpp::read_elf_word<big_endian>(pword + i); | |
342 | if (secnum >= this->shnum()) | |
343 | { | |
344 | fprintf(stderr, | |
345 | _("%s: %s: section %u in section group %u out of range"), | |
346 | program_name, this->name().c_str(), secnum, | |
347 | index); | |
348 | gold_exit(false); | |
349 | } | |
350 | (*omit)[secnum] = true; | |
351 | } | |
352 | ||
353 | return false; | |
354 | } | |
355 | ||
356 | // Whether to include a linkonce section in the link. NAME is the | |
357 | // name of the section and SHDR is the section header. | |
358 | ||
359 | // Linkonce sections are a GNU extension implemented in the original | |
360 | // GNU linker before section groups were defined. The semantics are | |
361 | // that we only include one linkonce section with a given name. The | |
362 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
363 | // where T is the type of section and SYMNAME is the name of a symbol. | |
364 | // In an attempt to make linkonce sections interact well with section | |
365 | // groups, we try to identify SYMNAME and use it like a section group | |
366 | // signature. We want to block section groups with that signature, | |
367 | // but not other linkonce sections with that signature. We also use | |
368 | // the full name of the linkonce section as a normal section group | |
369 | // signature. | |
370 | ||
371 | template<int size, bool big_endian> | |
372 | bool | |
373 | Sized_object<size, big_endian>::include_linkonce_section( | |
374 | Layout* layout, | |
375 | const char* name, | |
376 | const elfcpp::Shdr<size, big_endian>&) | |
377 | { | |
378 | const char* symname = strrchr(name, '.') + 1; | |
a783673b ILT |
379 | bool include1 = layout->add_comdat(symname, false); |
380 | bool include2 = layout->add_comdat(name, true); | |
381 | return include1 && include2; | |
a2fb1b05 ILT |
382 | } |
383 | ||
384 | // Lay out the input sections. We walk through the sections and check | |
385 | // whether they should be included in the link. If they should, we | |
386 | // pass them to the Layout object, which will return an output section | |
387 | // and an offset. | |
388 | ||
389 | template<int size, bool big_endian> | |
390 | void | |
12e14209 ILT |
391 | Sized_object<size, big_endian>::do_layout(Layout* layout, |
392 | Read_symbols_data* sd) | |
a2fb1b05 | 393 | { |
12e14209 ILT |
394 | unsigned int shnum = this->shnum(); |
395 | if (shnum == 0) | |
396 | return; | |
a2fb1b05 ILT |
397 | |
398 | // Get the section headers. | |
12e14209 | 399 | const unsigned char* pshdrs = sd->section_headers->data(); |
a2fb1b05 ILT |
400 | |
401 | // Get the section names. | |
12e14209 | 402 | const unsigned char* pnamesu = sd->section_names->data(); |
a2fb1b05 ILT |
403 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
404 | ||
405 | std::vector<Map_to_output>& map_sections(this->map_to_output()); | |
61ba1cf9 | 406 | map_sections.resize(shnum); |
a2fb1b05 ILT |
407 | |
408 | // Keep track of which sections to omit. | |
409 | std::vector<bool> omit(shnum, false); | |
410 | ||
12e14209 | 411 | for (unsigned int i = 0; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 412 | { |
75f65a3e | 413 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 414 | |
12e14209 | 415 | if (shdr.get_sh_name() >= sd->section_names_size) |
a2fb1b05 ILT |
416 | { |
417 | fprintf(stderr, | |
418 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
419 | program_name, this->name().c_str(), i, | |
420 | static_cast<unsigned long>(shdr.get_sh_name())); | |
421 | gold_exit(false); | |
422 | } | |
423 | ||
424 | const char* name = pnames + shdr.get_sh_name(); | |
425 | ||
426 | bool discard = omit[i]; | |
427 | if (!discard) | |
428 | { | |
429 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
430 | { | |
431 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
432 | discard = true; | |
433 | } | |
434 | else if (Layout::is_linkonce(name)) | |
435 | { | |
436 | if (!this->include_linkonce_section(layout, name, shdr)) | |
437 | discard = true; | |
438 | } | |
439 | } | |
440 | ||
441 | if (discard) | |
442 | { | |
443 | // Do not include this section in the link. | |
444 | map_sections[i].output_section = NULL; | |
445 | continue; | |
446 | } | |
447 | ||
448 | off_t offset; | |
449 | Output_section* os = layout->layout(this, name, shdr, &offset); | |
450 | ||
451 | map_sections[i].output_section = os; | |
452 | map_sections[i].offset = offset; | |
12e14209 ILT |
453 | } |
454 | ||
455 | delete sd->section_headers; | |
456 | sd->section_headers = NULL; | |
457 | delete sd->section_names; | |
458 | sd->section_names = NULL; | |
459 | } | |
460 | ||
461 | // Add the symbols to the symbol table. | |
462 | ||
463 | template<int size, bool big_endian> | |
464 | void | |
465 | Sized_object<size, big_endian>::do_add_symbols(Symbol_table* symtab, | |
466 | Read_symbols_data* sd) | |
467 | { | |
468 | if (sd->symbols == NULL) | |
469 | { | |
470 | assert(sd->symbol_names == NULL); | |
471 | return; | |
472 | } | |
a2fb1b05 | 473 | |
12e14209 ILT |
474 | const int sym_size = This::sym_size; |
475 | size_t symcount = sd->symbols_size / sym_size; | |
476 | if (symcount * sym_size != sd->symbols_size) | |
477 | { | |
478 | fprintf(stderr, | |
479 | _("%s: %s: size of symbols is not multiple of symbol size\n"), | |
480 | program_name, this->name().c_str()); | |
481 | gold_exit(false); | |
a2fb1b05 | 482 | } |
12e14209 ILT |
483 | |
484 | this->symbols_ = new Symbol*[symcount]; | |
485 | ||
486 | const unsigned char* psyms = sd->symbols->data(); | |
487 | const elfcpp::Sym<size, big_endian>* syms = | |
488 | reinterpret_cast<const elfcpp::Sym<size, big_endian>*>(psyms); | |
489 | const char* sym_names = | |
490 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
491 | symtab->add_from_object(this, syms, symcount, sym_names, | |
492 | sd->symbol_names_size, this->symbols_); | |
493 | ||
494 | delete sd->symbols; | |
495 | sd->symbols = NULL; | |
496 | delete sd->symbol_names; | |
497 | sd->symbol_names = NULL; | |
bae7f79e ILT |
498 | } |
499 | ||
75f65a3e | 500 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 ILT |
501 | // which they should be output, we add their names to *POOL, and we |
502 | // add their values to THIS->VALUES_. Return the new file offset. | |
503 | // This function is always called from the main thread. The actual | |
504 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
505 | |
506 | template<int size, bool big_endian> | |
507 | off_t | |
508 | Sized_object<size, big_endian>::do_finalize_local_symbols(off_t off, | |
509 | Stringpool* pool) | |
510 | { | |
61ba1cf9 ILT |
511 | if (this->symtab_shnum_ == 0) |
512 | { | |
513 | // This object has no symbols. Weird but legal. | |
514 | return off; | |
515 | } | |
516 | ||
517 | off = (off + (size >> 3) - 1) & ~ ((off_t) (size >> 3) - 1); | |
518 | ||
75f65a3e ILT |
519 | this->local_symbol_offset_ = off; |
520 | ||
521 | // Read the symbol table section header. | |
522 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
523 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
524 | ||
525 | // Read the local symbols. | |
75f65a3e | 526 | const int sym_size = This::sym_size; |
92e059d8 ILT |
527 | const unsigned int loccount = this->local_symbol_count_; |
528 | assert(loccount == symtabshdr.get_sh_info()); | |
75f65a3e ILT |
529 | off_t locsize = loccount * sym_size; |
530 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
531 | locsize); | |
532 | ||
61ba1cf9 ILT |
533 | this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount]; |
534 | ||
75f65a3e ILT |
535 | // Read the section header for the symbol names. |
536 | typename This::Shdr strtabshdr( | |
537 | this->section_header(symtabshdr.get_sh_link())); | |
538 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
539 | ||
540 | // Read the symbol names. | |
541 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
542 | strtabshdr.get_sh_size()); | |
543 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
544 | ||
545 | // Loop over the local symbols. | |
546 | ||
547 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
548 | unsigned int shnum = this->shnum(); | |
61ba1cf9 | 549 | unsigned int count = 0; |
75f65a3e ILT |
550 | // Skip the first, dummy, symbol. |
551 | psyms += sym_size; | |
61ba1cf9 | 552 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
553 | { |
554 | elfcpp::Sym<size, big_endian> sym(psyms); | |
555 | ||
556 | unsigned int shndx = sym.get_st_shndx(); | |
557 | ||
558 | if (shndx >= elfcpp::SHN_LORESERVE) | |
559 | { | |
61ba1cf9 ILT |
560 | if (shndx == elfcpp::SHN_ABS) |
561 | this->values_[i] = sym.get_st_value(); | |
562 | else | |
75f65a3e | 563 | { |
61ba1cf9 | 564 | // FIXME: Handle SHN_XINDEX. |
75f65a3e ILT |
565 | fprintf(stderr, |
566 | _("%s: %s: unknown section index %u " | |
567 | "for local symbol %u\n"), | |
568 | program_name, this->name().c_str(), shndx, i); | |
569 | gold_exit(false); | |
570 | } | |
75f65a3e ILT |
571 | } |
572 | else | |
573 | { | |
574 | if (shndx >= shnum) | |
575 | { | |
576 | fprintf(stderr, | |
577 | _("%s: %s: local symbol %u section index %u " | |
578 | "out of range\n"), | |
579 | program_name, this->name().c_str(), i, shndx); | |
580 | gold_exit(false); | |
581 | } | |
582 | ||
583 | if (mo[shndx].output_section == NULL) | |
61ba1cf9 ILT |
584 | { |
585 | this->values_[i] = 0; | |
586 | continue; | |
587 | } | |
588 | ||
589 | this->values_[i] = (mo[shndx].output_section->address() | |
590 | + sym.get_st_value()); | |
75f65a3e ILT |
591 | } |
592 | ||
593 | pool->add(pnames + sym.get_st_name()); | |
594 | off += sym_size; | |
61ba1cf9 | 595 | ++count; |
75f65a3e ILT |
596 | } |
597 | ||
61ba1cf9 ILT |
598 | this->output_local_symbol_count_ = count; |
599 | ||
75f65a3e ILT |
600 | return off; |
601 | } | |
602 | ||
61ba1cf9 ILT |
603 | // Write out the local symbols. |
604 | ||
605 | template<int size, bool big_endian> | |
606 | void | |
607 | Sized_object<size, big_endian>::write_local_symbols(Output_file* of, | |
608 | const Stringpool* sympool) | |
609 | { | |
610 | if (this->symtab_shnum_ == 0) | |
611 | { | |
612 | // This object has no symbols. Weird but legal. | |
613 | return; | |
614 | } | |
615 | ||
616 | // Read the symbol table section header. | |
617 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
618 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
92e059d8 ILT |
619 | const unsigned int loccount = this->local_symbol_count_; |
620 | assert(loccount == symtabshdr.get_sh_info()); | |
61ba1cf9 ILT |
621 | |
622 | // Read the local symbols. | |
623 | const int sym_size = This::sym_size; | |
92e059d8 | 624 | off_t locsize = loccount * sym_size; |
61ba1cf9 ILT |
625 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
626 | locsize); | |
627 | ||
628 | // Read the section header for the symbol names. | |
629 | typename This::Shdr strtabshdr( | |
630 | this->section_header(symtabshdr.get_sh_link())); | |
631 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
632 | ||
633 | // Read the symbol names. | |
634 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
635 | strtabshdr.get_sh_size()); | |
636 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
637 | ||
638 | // Get a view into the output file. | |
639 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
640 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
641 | output_size); | |
642 | ||
643 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
644 | ||
645 | psyms += sym_size; | |
646 | unsigned char* ov = oview; | |
92e059d8 | 647 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
61ba1cf9 ILT |
648 | { |
649 | elfcpp::Sym<size, big_endian> isym(psyms); | |
650 | elfcpp::Sym_write<size, big_endian> osym(ov); | |
651 | ||
652 | unsigned int st_shndx = isym.get_st_shndx(); | |
653 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
654 | { | |
655 | assert(st_shndx < mo.size()); | |
656 | if (mo[st_shndx].output_section == NULL) | |
657 | continue; | |
658 | st_shndx = mo[st_shndx].output_section->shndx(); | |
659 | } | |
660 | ||
661 | osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name())); | |
662 | osym.put_st_value(this->values_[i]); | |
663 | osym.put_st_size(isym.get_st_size()); | |
664 | osym.put_st_info(isym.get_st_info()); | |
665 | osym.put_st_other(isym.get_st_other()); | |
666 | osym.put_st_shndx(st_shndx); | |
667 | ||
668 | ov += sym_size; | |
669 | } | |
670 | ||
671 | assert(ov - oview == output_size); | |
672 | ||
673 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
674 | } | |
675 | ||
54dc6425 ILT |
676 | // Input_objects methods. |
677 | ||
678 | void | |
679 | Input_objects::add_object(Object* obj) | |
680 | { | |
681 | this->object_list_.push_back(obj); | |
75f65a3e ILT |
682 | |
683 | Target* target = obj->target(); | |
684 | if (this->target_ == NULL) | |
685 | this->target_ = target; | |
686 | else if (this->target_ != target) | |
687 | { | |
688 | fprintf(stderr, "%s: %s: incompatible target\n", | |
689 | program_name, obj->name().c_str()); | |
690 | gold_exit(false); | |
691 | } | |
692 | ||
54dc6425 ILT |
693 | if (obj->is_dynamic()) |
694 | this->any_dynamic_ = true; | |
695 | } | |
696 | ||
92e059d8 ILT |
697 | // Relocate_info methods. |
698 | ||
699 | // Return a string describing the location of a relocation. This is | |
700 | // only used in error messages. | |
701 | ||
702 | template<int size, bool big_endian> | |
703 | std::string | |
704 | Relocate_info<size, big_endian>::location(size_t relnum, off_t) const | |
705 | { | |
706 | std::string ret(this->object->name()); | |
707 | ret += ": reloc "; | |
708 | char buf[100]; | |
709 | snprintf(buf, sizeof buf, "%zu", relnum); | |
710 | ret += buf; | |
711 | ret += " in reloc section "; | |
712 | snprintf(buf, sizeof buf, "%u", this->reloc_shndx); | |
713 | ret += buf; | |
714 | ret += " (" + this->object->section_name(this->reloc_shndx); | |
715 | ret += ") for section "; | |
716 | snprintf(buf, sizeof buf, "%u", this->data_shndx); | |
717 | ret += buf; | |
718 | ret += " (" + this->object->section_name(this->data_shndx) + ")"; | |
719 | return ret; | |
720 | } | |
721 | ||
bae7f79e ILT |
722 | } // End namespace gold. |
723 | ||
724 | namespace | |
725 | { | |
726 | ||
727 | using namespace gold; | |
728 | ||
729 | // Read an ELF file with the header and return the appropriate | |
730 | // instance of Object. | |
731 | ||
732 | template<int size, bool big_endian> | |
733 | Object* | |
734 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
735 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
736 | { | |
737 | int et = ehdr.get_e_type(); | |
738 | if (et != elfcpp::ET_REL && et != elfcpp::ET_DYN) | |
739 | { | |
740 | fprintf(stderr, "%s: %s: unsupported ELF type %d\n", | |
741 | program_name, name.c_str(), static_cast<int>(et)); | |
742 | gold_exit(false); | |
743 | } | |
744 | ||
745 | if (et == elfcpp::ET_REL) | |
746 | { | |
747 | Sized_object<size, big_endian>* obj = | |
748 | new Sized_object<size, big_endian>(name, input_file, offset, ehdr); | |
749 | obj->setup(ehdr); | |
750 | return obj; | |
751 | } | |
752 | else | |
753 | { | |
754 | // elfcpp::ET_DYN | |
755 | fprintf(stderr, _("%s: %s: dynamic objects are not yet supported\n"), | |
756 | program_name, name.c_str()); | |
757 | gold_exit(false); | |
758 | // Sized_dynobj<size, big_endian>* obj = | |
759 | // new Sized_dynobj<size, big_endian>(this->input_.name(), input_file, | |
760 | // offset, ehdr); | |
761 | // obj->setup(ehdr); | |
762 | // return obj; | |
763 | } | |
764 | } | |
765 | ||
766 | } // End anonymous namespace. | |
767 | ||
768 | namespace gold | |
769 | { | |
770 | ||
771 | // Read an ELF file and return the appropriate instance of Object. | |
772 | ||
773 | Object* | |
774 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
775 | const unsigned char* p, off_t bytes) | |
776 | { | |
777 | if (bytes < elfcpp::EI_NIDENT) | |
778 | { | |
779 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
780 | program_name, name.c_str()); | |
781 | gold_exit(false); | |
782 | } | |
783 | ||
784 | int v = p[elfcpp::EI_VERSION]; | |
785 | if (v != elfcpp::EV_CURRENT) | |
786 | { | |
787 | if (v == elfcpp::EV_NONE) | |
788 | fprintf(stderr, _("%s: %s: invalid ELF version 0\n"), | |
789 | program_name, name.c_str()); | |
790 | else | |
791 | fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"), | |
792 | program_name, name.c_str(), v); | |
793 | gold_exit(false); | |
794 | } | |
795 | ||
796 | int c = p[elfcpp::EI_CLASS]; | |
797 | if (c == elfcpp::ELFCLASSNONE) | |
798 | { | |
799 | fprintf(stderr, _("%s: %s: invalid ELF class 0\n"), | |
800 | program_name, name.c_str()); | |
801 | gold_exit(false); | |
802 | } | |
803 | else if (c != elfcpp::ELFCLASS32 | |
804 | && c != elfcpp::ELFCLASS64) | |
805 | { | |
806 | fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"), | |
807 | program_name, name.c_str(), c); | |
808 | gold_exit(false); | |
809 | } | |
810 | ||
811 | int d = p[elfcpp::EI_DATA]; | |
812 | if (d == elfcpp::ELFDATANONE) | |
813 | { | |
814 | fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"), | |
815 | program_name, name.c_str()); | |
816 | gold_exit(false); | |
817 | } | |
818 | else if (d != elfcpp::ELFDATA2LSB | |
819 | && d != elfcpp::ELFDATA2MSB) | |
820 | { | |
821 | fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"), | |
822 | program_name, name.c_str(), d); | |
823 | gold_exit(false); | |
824 | } | |
825 | ||
826 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
827 | ||
828 | if (c == elfcpp::ELFCLASS32) | |
829 | { | |
830 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
831 | { | |
832 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
833 | program_name, name.c_str()); | |
834 | gold_exit(false); | |
835 | } | |
836 | if (big_endian) | |
837 | { | |
838 | elfcpp::Ehdr<32, true> ehdr(p); | |
839 | return make_elf_sized_object<32, true>(name, input_file, | |
840 | offset, ehdr); | |
841 | } | |
842 | else | |
843 | { | |
844 | elfcpp::Ehdr<32, false> ehdr(p); | |
845 | return make_elf_sized_object<32, false>(name, input_file, | |
846 | offset, ehdr); | |
847 | } | |
848 | } | |
849 | else | |
850 | { | |
851 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
852 | { | |
853 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
854 | program_name, name.c_str()); | |
855 | gold_exit(false); | |
856 | } | |
857 | if (big_endian) | |
858 | { | |
859 | elfcpp::Ehdr<64, true> ehdr(p); | |
860 | return make_elf_sized_object<64, true>(name, input_file, | |
861 | offset, ehdr); | |
862 | } | |
863 | else | |
864 | { | |
865 | elfcpp::Ehdr<64, false> ehdr(p); | |
866 | return make_elf_sized_object<64, false>(name, input_file, | |
867 | offset, ehdr); | |
868 | } | |
869 | } | |
870 | } | |
871 | ||
872 | // Instantiate the templates we need. We could use the configure | |
873 | // script to restrict this to only the ones for implemented targets. | |
874 | ||
875 | template | |
876 | class Sized_object<32, false>; | |
877 | ||
878 | template | |
879 | class Sized_object<32, true>; | |
880 | ||
881 | template | |
882 | class Sized_object<64, false>; | |
883 | ||
884 | template | |
885 | class Sized_object<64, true>; | |
886 | ||
92e059d8 ILT |
887 | template |
888 | struct Relocate_info<32, false>; | |
889 | ||
890 | template | |
891 | struct Relocate_info<32, true>; | |
892 | ||
893 | template | |
894 | struct Relocate_info<64, false>; | |
895 | ||
896 | template | |
897 | struct Relocate_info<64, true>; | |
898 | ||
bae7f79e | 899 | } // End namespace gold. |