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), |
bae7f79e | 47 | flags_(ehdr.get_e_flags()), |
bae7f79e | 48 | shoff_(ehdr.get_e_shoff()), |
bae7f79e | 49 | shstrndx_(0), |
14bfc3f5 | 50 | symtab_shnum_(0), |
61ba1cf9 ILT |
51 | local_symbol_count_(0), |
52 | output_local_symbol_count_(0), | |
75f65a3e | 53 | symbols_(NULL), |
61ba1cf9 ILT |
54 | local_symbol_offset_(0), |
55 | values_(NULL) | |
bae7f79e | 56 | { |
a2fb1b05 | 57 | if (ehdr.get_e_ehsize() != This::ehdr_size) |
bae7f79e ILT |
58 | { |
59 | fprintf(stderr, _("%s: %s: bad e_ehsize field (%d != %d)\n"), | |
60 | program_name, this->name().c_str(), ehdr.get_e_ehsize(), | |
a2fb1b05 | 61 | This::ehdr_size); |
bae7f79e ILT |
62 | gold_exit(false); |
63 | } | |
a2fb1b05 | 64 | if (ehdr.get_e_shentsize() != This::shdr_size) |
bae7f79e ILT |
65 | { |
66 | fprintf(stderr, _("%s: %s: bad e_shentsize field (%d != %d)\n"), | |
67 | program_name, this->name().c_str(), ehdr.get_e_shentsize(), | |
a2fb1b05 | 68 | This::shdr_size); |
bae7f79e ILT |
69 | gold_exit(false); |
70 | } | |
71 | } | |
72 | ||
73 | template<int size, bool big_endian> | |
74 | Sized_object<size, big_endian>::~Sized_object() | |
75 | { | |
76 | } | |
77 | ||
75f65a3e ILT |
78 | // Read the section header for section SHNUM. |
79 | ||
80 | template<int size, bool big_endian> | |
81 | const unsigned char* | |
82 | Sized_object<size, big_endian>::section_header(unsigned int shnum) | |
83 | { | |
61ba1cf9 | 84 | assert(shnum < this->shnum()); |
75f65a3e ILT |
85 | off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size; |
86 | return this->get_view(symtabshdroff, This::shdr_size); | |
87 | } | |
88 | ||
bae7f79e ILT |
89 | // Set up an object file bsaed on the file header. This sets up the |
90 | // target and reads the section information. | |
91 | ||
92 | template<int size, bool big_endian> | |
93 | void | |
94 | Sized_object<size, big_endian>::setup( | |
95 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
96 | { | |
a2fb1b05 ILT |
97 | int machine = ehdr.get_e_machine(); |
98 | Target* target = select_target(machine, size, big_endian, | |
99 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
100 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
14bfc3f5 ILT |
101 | if (target == NULL) |
102 | { | |
103 | fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"), | |
a2fb1b05 | 104 | program_name, this->name().c_str(), machine); |
14bfc3f5 ILT |
105 | gold_exit(false); |
106 | } | |
107 | this->set_target(target); | |
bae7f79e ILT |
108 | unsigned int shnum = ehdr.get_e_shnum(); |
109 | unsigned int shstrndx = ehdr.get_e_shstrndx(); | |
110 | if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX) | |
111 | && this->shoff_ != 0) | |
112 | { | |
75f65a3e | 113 | typename This::Shdr shdr(this->section_header(0)); |
bae7f79e ILT |
114 | if (shnum == 0) |
115 | shnum = shdr.get_sh_size(); | |
116 | if (shstrndx == elfcpp::SHN_XINDEX) | |
117 | shstrndx = shdr.get_sh_link(); | |
118 | } | |
a2fb1b05 | 119 | this->set_shnum(shnum); |
bae7f79e ILT |
120 | this->shstrndx_ = shstrndx; |
121 | ||
122 | if (shnum == 0) | |
123 | return; | |
124 | ||
125 | // Find the SHT_SYMTAB section. | |
a2fb1b05 ILT |
126 | const unsigned char* p = this->get_view (this->shoff_, |
127 | shnum * This::shdr_size); | |
bae7f79e | 128 | // Skip the first section, which is always empty. |
a2fb1b05 | 129 | p += This::shdr_size; |
bae7f79e ILT |
130 | for (unsigned int i = 1; i < shnum; ++i) |
131 | { | |
75f65a3e | 132 | typename This::Shdr shdr(p); |
bae7f79e ILT |
133 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
134 | { | |
135 | this->symtab_shnum_ = i; | |
136 | break; | |
137 | } | |
a2fb1b05 | 138 | p += This::shdr_size; |
bae7f79e ILT |
139 | } |
140 | } | |
141 | ||
142 | // Read the symbols and relocations from an object file. | |
143 | ||
144 | template<int size, bool big_endian> | |
145 | Read_symbols_data | |
146 | Sized_object<size, big_endian>::do_read_symbols() | |
147 | { | |
148 | if (this->symtab_shnum_ == 0) | |
149 | { | |
150 | // No symbol table. Weird but legal. | |
151 | Read_symbols_data ret; | |
152 | ret.symbols = NULL; | |
153 | ret.symbols_size = 0; | |
154 | ret.symbol_names = NULL; | |
155 | ret.symbol_names_size = 0; | |
156 | return ret; | |
157 | } | |
158 | ||
bae7f79e | 159 | // Read the symbol table section header. |
75f65a3e | 160 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); |
bae7f79e ILT |
161 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
162 | ||
75f65a3e ILT |
163 | // We only need the external symbols. |
164 | const int sym_size = This::sym_size; | |
165 | off_t locsize = symtabshdr.get_sh_info() * sym_size; | |
166 | off_t extoff = symtabshdr.get_sh_offset() + locsize; | |
167 | off_t extsize = symtabshdr.get_sh_size() - locsize; | |
168 | ||
bae7f79e | 169 | // Read the symbol table. |
75f65a3e | 170 | File_view* fvsymtab = this->get_lasting_view(extoff, extsize); |
bae7f79e ILT |
171 | |
172 | // Read the section header for the symbol names. | |
173 | unsigned int strtab_shnum = symtabshdr.get_sh_link(); | |
a2fb1b05 | 174 | if (strtab_shnum == 0 || strtab_shnum >= this->shnum()) |
bae7f79e ILT |
175 | { |
176 | fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"), | |
177 | program_name, this->name().c_str(), strtab_shnum); | |
178 | gold_exit(false); | |
179 | } | |
75f65a3e | 180 | typename This::Shdr strtabshdr(this->section_header(strtab_shnum)); |
bae7f79e ILT |
181 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
182 | { | |
183 | fprintf(stderr, | |
184 | _("%s: %s: symbol table name section has wrong type: %u\n"), | |
185 | program_name, this->name().c_str(), | |
186 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
187 | gold_exit(false); | |
188 | } | |
189 | ||
190 | // Read the symbol names. | |
191 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
192 | strtabshdr.get_sh_size()); | |
193 | ||
194 | Read_symbols_data ret; | |
195 | ret.symbols = fvsymtab; | |
75f65a3e | 196 | ret.symbols_size = extsize; |
bae7f79e ILT |
197 | ret.symbol_names = fvstrtab; |
198 | ret.symbol_names_size = strtabshdr.get_sh_size(); | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | // Add the symbols to the symbol table. | |
204 | ||
205 | template<int size, bool big_endian> | |
206 | void | |
14bfc3f5 ILT |
207 | Sized_object<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
208 | Read_symbols_data sd) | |
bae7f79e ILT |
209 | { |
210 | if (sd.symbols == NULL) | |
211 | { | |
212 | assert(sd.symbol_names == NULL); | |
213 | return; | |
214 | } | |
215 | ||
a2fb1b05 | 216 | const int sym_size = This::sym_size; |
14bfc3f5 ILT |
217 | size_t symcount = sd.symbols_size / sym_size; |
218 | if (symcount * sym_size != sd.symbols_size) | |
bae7f79e | 219 | { |
14bfc3f5 ILT |
220 | fprintf(stderr, |
221 | _("%s: %s: size of symbols is not multiple of symbol size\n"), | |
222 | program_name, this->name().c_str()); | |
223 | gold_exit(false); | |
bae7f79e | 224 | } |
14bfc3f5 | 225 | |
75f65a3e | 226 | this->symbols_ = new Symbol*[symcount]; |
54dc6425 | 227 | |
75f65a3e | 228 | const elfcpp::Sym<size, big_endian>* syms = |
54dc6425 | 229 | reinterpret_cast<const elfcpp::Sym<size, big_endian>*>(sd.symbols->data()); |
75f65a3e ILT |
230 | const char* sym_names = |
231 | reinterpret_cast<const char*>(sd.symbol_names->data()); | |
232 | symtab->add_from_object(this, syms, symcount, sym_names, | |
233 | sd.symbol_names_size, this->symbols_); | |
a2fb1b05 ILT |
234 | |
235 | delete sd.symbols; | |
236 | delete sd.symbol_names; | |
237 | } | |
238 | ||
239 | // Return whether to include a section group in the link. LAYOUT is | |
240 | // used to keep track of which section groups we have already seen. | |
241 | // INDEX is the index of the section group and SHDR is the section | |
242 | // header. If we do not want to include this group, we set bits in | |
243 | // OMIT for each section which should be discarded. | |
244 | ||
245 | template<int size, bool big_endian> | |
246 | bool | |
247 | Sized_object<size, big_endian>::include_section_group( | |
248 | Layout* layout, | |
249 | unsigned int index, | |
250 | const elfcpp::Shdr<size, big_endian>& shdr, | |
251 | std::vector<bool>* omit) | |
252 | { | |
253 | // Read the section contents. | |
254 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
255 | shdr.get_sh_size()); | |
256 | const elfcpp::Elf_Word* pword = | |
257 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
258 | ||
259 | // The first word contains flags. We only care about COMDAT section | |
260 | // groups. Other section groups are always included in the link | |
261 | // just like ordinary sections. | |
262 | elfcpp::Elf_Word flags = elfcpp::read_elf_word<big_endian>(pword); | |
263 | if ((flags & elfcpp::GRP_COMDAT) == 0) | |
264 | return true; | |
265 | ||
266 | // Look up the group signature, which is the name of a symbol. This | |
267 | // is a lot of effort to go to to read a string. Why didn't they | |
268 | // just use the name of the SHT_GROUP section as the group | |
269 | // signature? | |
270 | ||
271 | // Get the appropriate symbol table header (this will normally be | |
272 | // the single SHT_SYMTAB section, but in principle it need not be). | |
273 | if (shdr.get_sh_link() >= this->shnum()) | |
274 | { | |
275 | fprintf(stderr, _("%s: %s: section group %u link %u out of range\n"), | |
276 | program_name, this->name().c_str(), index, shdr.get_sh_link()); | |
277 | gold_exit(false); | |
278 | } | |
75f65a3e ILT |
279 | |
280 | typename This::Shdr symshdr(this->section_header(shdr.get_sh_link())); | |
a2fb1b05 ILT |
281 | |
282 | // Read the symbol table entry. | |
283 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
284 | { | |
285 | fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"), | |
286 | program_name, this->name().c_str(), index, shdr.get_sh_info()); | |
287 | gold_exit(false); | |
288 | } | |
289 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
290 | const unsigned char* psym = this->get_view(symoff, This::sym_size); | |
291 | elfcpp::Sym<size, big_endian> sym(psym); | |
292 | ||
293 | // Read the section header for the symbol table names. | |
294 | if (symshdr.get_sh_link() >= this->shnum()) | |
295 | { | |
296 | fprintf(stderr, _("%s; %s: symtab section %u link %u out of range\n"), | |
297 | program_name, this->name().c_str(), shdr.get_sh_link(), | |
298 | symshdr.get_sh_link()); | |
299 | gold_exit(false); | |
300 | } | |
75f65a3e ILT |
301 | |
302 | typename This::Shdr symnamehdr(this->section_header(symshdr.get_sh_link())); | |
a2fb1b05 ILT |
303 | |
304 | // Read the symbol table names. | |
305 | const unsigned char *psymnamesu = this->get_view(symnamehdr.get_sh_offset(), | |
306 | symnamehdr.get_sh_size()); | |
307 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); | |
308 | ||
309 | // Get the section group signature. | |
310 | if (sym.get_st_name() >= symnamehdr.get_sh_size()) | |
311 | { | |
312 | fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"), | |
313 | program_name, this->name().c_str(), shdr.get_sh_info(), | |
314 | sym.get_st_name()); | |
315 | gold_exit(false); | |
316 | } | |
317 | ||
318 | const char* signature = psymnames + sym.get_st_name(); | |
319 | ||
320 | // Record this section group, and see whether we've already seen one | |
321 | // with the same signature. | |
322 | if (layout->add_comdat(signature, true)) | |
323 | return true; | |
324 | ||
325 | // This is a duplicate. We want to discard the sections in this | |
326 | // group. | |
327 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
328 | for (size_t i = 1; i < count; ++i) | |
329 | { | |
330 | elfcpp::Elf_Word secnum = elfcpp::read_elf_word<big_endian>(pword + i); | |
331 | if (secnum >= this->shnum()) | |
332 | { | |
333 | fprintf(stderr, | |
334 | _("%s: %s: section %u in section group %u out of range"), | |
335 | program_name, this->name().c_str(), secnum, | |
336 | index); | |
337 | gold_exit(false); | |
338 | } | |
339 | (*omit)[secnum] = true; | |
340 | } | |
341 | ||
342 | return false; | |
343 | } | |
344 | ||
345 | // Whether to include a linkonce section in the link. NAME is the | |
346 | // name of the section and SHDR is the section header. | |
347 | ||
348 | // Linkonce sections are a GNU extension implemented in the original | |
349 | // GNU linker before section groups were defined. The semantics are | |
350 | // that we only include one linkonce section with a given name. The | |
351 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
352 | // where T is the type of section and SYMNAME is the name of a symbol. | |
353 | // In an attempt to make linkonce sections interact well with section | |
354 | // groups, we try to identify SYMNAME and use it like a section group | |
355 | // signature. We want to block section groups with that signature, | |
356 | // but not other linkonce sections with that signature. We also use | |
357 | // the full name of the linkonce section as a normal section group | |
358 | // signature. | |
359 | ||
360 | template<int size, bool big_endian> | |
361 | bool | |
362 | Sized_object<size, big_endian>::include_linkonce_section( | |
363 | Layout* layout, | |
364 | const char* name, | |
365 | const elfcpp::Shdr<size, big_endian>&) | |
366 | { | |
367 | const char* symname = strrchr(name, '.') + 1; | |
368 | bool omit1 = layout->add_comdat(symname, false); | |
369 | bool omit2 = layout->add_comdat(name, true); | |
370 | return omit1 || omit2; | |
371 | } | |
372 | ||
373 | // Lay out the input sections. We walk through the sections and check | |
374 | // whether they should be included in the link. If they should, we | |
375 | // pass them to the Layout object, which will return an output section | |
376 | // and an offset. | |
377 | ||
378 | template<int size, bool big_endian> | |
379 | void | |
380 | Sized_object<size, big_endian>::do_layout(Layout* layout) | |
381 | { | |
382 | // This is always called from the main thread. Lock the file to | |
383 | // keep the error checks happy. | |
384 | Task_locker_obj<File_read> frl(this->input_file()->file()); | |
385 | ||
386 | // Get the section headers. | |
387 | unsigned int shnum = this->shnum(); | |
388 | const unsigned char* pshdrs = this->get_view(this->shoff_, | |
389 | shnum * This::shdr_size); | |
390 | ||
391 | // Get the section names. | |
392 | const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size; | |
75f65a3e | 393 | typename This::Shdr shdrnames(pshdrnames); |
a2fb1b05 ILT |
394 | typename elfcpp::Elf_types<size>::Elf_WXword names_size = |
395 | shdrnames.get_sh_size(); | |
396 | const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(), | |
397 | shdrnames.get_sh_size()); | |
398 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
399 | ||
400 | std::vector<Map_to_output>& map_sections(this->map_to_output()); | |
61ba1cf9 | 401 | map_sections.resize(shnum); |
a2fb1b05 ILT |
402 | |
403 | // Keep track of which sections to omit. | |
404 | std::vector<bool> omit(shnum, false); | |
405 | ||
406 | for (unsigned int i = 0; i < shnum; ++i) | |
407 | { | |
75f65a3e | 408 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 ILT |
409 | |
410 | if (shdr.get_sh_name() >= names_size) | |
411 | { | |
412 | fprintf(stderr, | |
413 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
414 | program_name, this->name().c_str(), i, | |
415 | static_cast<unsigned long>(shdr.get_sh_name())); | |
416 | gold_exit(false); | |
417 | } | |
418 | ||
419 | const char* name = pnames + shdr.get_sh_name(); | |
420 | ||
421 | bool discard = omit[i]; | |
422 | if (!discard) | |
423 | { | |
424 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
425 | { | |
426 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
427 | discard = true; | |
428 | } | |
429 | else if (Layout::is_linkonce(name)) | |
430 | { | |
431 | if (!this->include_linkonce_section(layout, name, shdr)) | |
432 | discard = true; | |
433 | } | |
434 | } | |
435 | ||
436 | if (discard) | |
437 | { | |
438 | // Do not include this section in the link. | |
439 | map_sections[i].output_section = NULL; | |
440 | continue; | |
441 | } | |
442 | ||
443 | off_t offset; | |
444 | Output_section* os = layout->layout(this, name, shdr, &offset); | |
445 | ||
446 | map_sections[i].output_section = os; | |
447 | map_sections[i].offset = offset; | |
448 | ||
449 | pshdrs += This::shdr_size; | |
450 | } | |
bae7f79e ILT |
451 | } |
452 | ||
75f65a3e | 453 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 ILT |
454 | // which they should be output, we add their names to *POOL, and we |
455 | // add their values to THIS->VALUES_. Return the new file offset. | |
456 | // This function is always called from the main thread. The actual | |
457 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
458 | |
459 | template<int size, bool big_endian> | |
460 | off_t | |
461 | Sized_object<size, big_endian>::do_finalize_local_symbols(off_t off, | |
462 | Stringpool* pool) | |
463 | { | |
61ba1cf9 ILT |
464 | if (this->symtab_shnum_ == 0) |
465 | { | |
466 | // This object has no symbols. Weird but legal. | |
467 | return off; | |
468 | } | |
469 | ||
470 | off = (off + (size >> 3) - 1) & ~ ((off_t) (size >> 3) - 1); | |
471 | ||
75f65a3e ILT |
472 | this->local_symbol_offset_ = off; |
473 | ||
474 | // Read the symbol table section header. | |
475 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
476 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
477 | ||
478 | // Read the local symbols. | |
479 | unsigned int loccount = symtabshdr.get_sh_info(); | |
480 | const int sym_size = This::sym_size; | |
481 | off_t locsize = loccount * sym_size; | |
482 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
483 | locsize); | |
484 | ||
61ba1cf9 ILT |
485 | this->local_symbol_count_ = loccount; |
486 | ||
487 | this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount]; | |
488 | ||
75f65a3e ILT |
489 | // Read the section header for the symbol names. |
490 | typename This::Shdr strtabshdr( | |
491 | this->section_header(symtabshdr.get_sh_link())); | |
492 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
493 | ||
494 | // Read the symbol names. | |
495 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
496 | strtabshdr.get_sh_size()); | |
497 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
498 | ||
499 | // Loop over the local symbols. | |
500 | ||
501 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
502 | unsigned int shnum = this->shnum(); | |
61ba1cf9 | 503 | unsigned int count = 0; |
75f65a3e ILT |
504 | // Skip the first, dummy, symbol. |
505 | psyms += sym_size; | |
61ba1cf9 | 506 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
507 | { |
508 | elfcpp::Sym<size, big_endian> sym(psyms); | |
509 | ||
510 | unsigned int shndx = sym.get_st_shndx(); | |
511 | ||
512 | if (shndx >= elfcpp::SHN_LORESERVE) | |
513 | { | |
61ba1cf9 ILT |
514 | if (shndx == elfcpp::SHN_ABS) |
515 | this->values_[i] = sym.get_st_value(); | |
516 | else | |
75f65a3e | 517 | { |
61ba1cf9 | 518 | // FIXME: Handle SHN_XINDEX. |
75f65a3e ILT |
519 | fprintf(stderr, |
520 | _("%s: %s: unknown section index %u " | |
521 | "for local symbol %u\n"), | |
522 | program_name, this->name().c_str(), shndx, i); | |
523 | gold_exit(false); | |
524 | } | |
75f65a3e ILT |
525 | } |
526 | else | |
527 | { | |
528 | if (shndx >= shnum) | |
529 | { | |
530 | fprintf(stderr, | |
531 | _("%s: %s: local symbol %u section index %u " | |
532 | "out of range\n"), | |
533 | program_name, this->name().c_str(), i, shndx); | |
534 | gold_exit(false); | |
535 | } | |
536 | ||
537 | if (mo[shndx].output_section == NULL) | |
61ba1cf9 ILT |
538 | { |
539 | this->values_[i] = 0; | |
540 | continue; | |
541 | } | |
542 | ||
543 | this->values_[i] = (mo[shndx].output_section->address() | |
544 | + sym.get_st_value()); | |
75f65a3e ILT |
545 | } |
546 | ||
547 | pool->add(pnames + sym.get_st_name()); | |
548 | off += sym_size; | |
61ba1cf9 | 549 | ++count; |
75f65a3e ILT |
550 | } |
551 | ||
61ba1cf9 ILT |
552 | this->output_local_symbol_count_ = count; |
553 | ||
75f65a3e ILT |
554 | return off; |
555 | } | |
556 | ||
61ba1cf9 ILT |
557 | // Write out the local symbols. |
558 | ||
559 | template<int size, bool big_endian> | |
560 | void | |
561 | Sized_object<size, big_endian>::write_local_symbols(Output_file* of, | |
562 | const Stringpool* sympool) | |
563 | { | |
564 | if (this->symtab_shnum_ == 0) | |
565 | { | |
566 | // This object has no symbols. Weird but legal. | |
567 | return; | |
568 | } | |
569 | ||
570 | // Read the symbol table section header. | |
571 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
572 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
573 | unsigned int local_symbol_count = this->local_symbol_count_; | |
574 | assert(local_symbol_count == symtabshdr.get_sh_info()); | |
575 | ||
576 | // Read the local symbols. | |
577 | const int sym_size = This::sym_size; | |
578 | off_t locsize = local_symbol_count * sym_size; | |
579 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
580 | locsize); | |
581 | ||
582 | // Read the section header for the symbol names. | |
583 | typename This::Shdr strtabshdr( | |
584 | this->section_header(symtabshdr.get_sh_link())); | |
585 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
586 | ||
587 | // Read the symbol names. | |
588 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
589 | strtabshdr.get_sh_size()); | |
590 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
591 | ||
592 | // Get a view into the output file. | |
593 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
594 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
595 | output_size); | |
596 | ||
597 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
598 | ||
599 | psyms += sym_size; | |
600 | unsigned char* ov = oview; | |
601 | for (unsigned int i = 1; i < local_symbol_count; ++i, psyms += sym_size) | |
602 | { | |
603 | elfcpp::Sym<size, big_endian> isym(psyms); | |
604 | elfcpp::Sym_write<size, big_endian> osym(ov); | |
605 | ||
606 | unsigned int st_shndx = isym.get_st_shndx(); | |
607 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
608 | { | |
609 | assert(st_shndx < mo.size()); | |
610 | if (mo[st_shndx].output_section == NULL) | |
611 | continue; | |
612 | st_shndx = mo[st_shndx].output_section->shndx(); | |
613 | } | |
614 | ||
615 | osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name())); | |
616 | osym.put_st_value(this->values_[i]); | |
617 | osym.put_st_size(isym.get_st_size()); | |
618 | osym.put_st_info(isym.get_st_info()); | |
619 | osym.put_st_other(isym.get_st_other()); | |
620 | osym.put_st_shndx(st_shndx); | |
621 | ||
622 | ov += sym_size; | |
623 | } | |
624 | ||
625 | assert(ov - oview == output_size); | |
626 | ||
627 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
628 | } | |
629 | ||
54dc6425 ILT |
630 | // Input_objects methods. |
631 | ||
632 | void | |
633 | Input_objects::add_object(Object* obj) | |
634 | { | |
635 | this->object_list_.push_back(obj); | |
75f65a3e ILT |
636 | |
637 | Target* target = obj->target(); | |
638 | if (this->target_ == NULL) | |
639 | this->target_ = target; | |
640 | else if (this->target_ != target) | |
641 | { | |
642 | fprintf(stderr, "%s: %s: incompatible target\n", | |
643 | program_name, obj->name().c_str()); | |
644 | gold_exit(false); | |
645 | } | |
646 | ||
54dc6425 ILT |
647 | if (obj->is_dynamic()) |
648 | this->any_dynamic_ = true; | |
649 | } | |
650 | ||
bae7f79e ILT |
651 | } // End namespace gold. |
652 | ||
653 | namespace | |
654 | { | |
655 | ||
656 | using namespace gold; | |
657 | ||
658 | // Read an ELF file with the header and return the appropriate | |
659 | // instance of Object. | |
660 | ||
661 | template<int size, bool big_endian> | |
662 | Object* | |
663 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
664 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
665 | { | |
666 | int et = ehdr.get_e_type(); | |
667 | if (et != elfcpp::ET_REL && et != elfcpp::ET_DYN) | |
668 | { | |
669 | fprintf(stderr, "%s: %s: unsupported ELF type %d\n", | |
670 | program_name, name.c_str(), static_cast<int>(et)); | |
671 | gold_exit(false); | |
672 | } | |
673 | ||
674 | if (et == elfcpp::ET_REL) | |
675 | { | |
676 | Sized_object<size, big_endian>* obj = | |
677 | new Sized_object<size, big_endian>(name, input_file, offset, ehdr); | |
678 | obj->setup(ehdr); | |
679 | return obj; | |
680 | } | |
681 | else | |
682 | { | |
683 | // elfcpp::ET_DYN | |
684 | fprintf(stderr, _("%s: %s: dynamic objects are not yet supported\n"), | |
685 | program_name, name.c_str()); | |
686 | gold_exit(false); | |
687 | // Sized_dynobj<size, big_endian>* obj = | |
688 | // new Sized_dynobj<size, big_endian>(this->input_.name(), input_file, | |
689 | // offset, ehdr); | |
690 | // obj->setup(ehdr); | |
691 | // return obj; | |
692 | } | |
693 | } | |
694 | ||
695 | } // End anonymous namespace. | |
696 | ||
697 | namespace gold | |
698 | { | |
699 | ||
700 | // Read an ELF file and return the appropriate instance of Object. | |
701 | ||
702 | Object* | |
703 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
704 | const unsigned char* p, off_t bytes) | |
705 | { | |
706 | if (bytes < elfcpp::EI_NIDENT) | |
707 | { | |
708 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
709 | program_name, name.c_str()); | |
710 | gold_exit(false); | |
711 | } | |
712 | ||
713 | int v = p[elfcpp::EI_VERSION]; | |
714 | if (v != elfcpp::EV_CURRENT) | |
715 | { | |
716 | if (v == elfcpp::EV_NONE) | |
717 | fprintf(stderr, _("%s: %s: invalid ELF version 0\n"), | |
718 | program_name, name.c_str()); | |
719 | else | |
720 | fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"), | |
721 | program_name, name.c_str(), v); | |
722 | gold_exit(false); | |
723 | } | |
724 | ||
725 | int c = p[elfcpp::EI_CLASS]; | |
726 | if (c == elfcpp::ELFCLASSNONE) | |
727 | { | |
728 | fprintf(stderr, _("%s: %s: invalid ELF class 0\n"), | |
729 | program_name, name.c_str()); | |
730 | gold_exit(false); | |
731 | } | |
732 | else if (c != elfcpp::ELFCLASS32 | |
733 | && c != elfcpp::ELFCLASS64) | |
734 | { | |
735 | fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"), | |
736 | program_name, name.c_str(), c); | |
737 | gold_exit(false); | |
738 | } | |
739 | ||
740 | int d = p[elfcpp::EI_DATA]; | |
741 | if (d == elfcpp::ELFDATANONE) | |
742 | { | |
743 | fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"), | |
744 | program_name, name.c_str()); | |
745 | gold_exit(false); | |
746 | } | |
747 | else if (d != elfcpp::ELFDATA2LSB | |
748 | && d != elfcpp::ELFDATA2MSB) | |
749 | { | |
750 | fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"), | |
751 | program_name, name.c_str(), d); | |
752 | gold_exit(false); | |
753 | } | |
754 | ||
755 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
756 | ||
757 | if (c == elfcpp::ELFCLASS32) | |
758 | { | |
759 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
760 | { | |
761 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
762 | program_name, name.c_str()); | |
763 | gold_exit(false); | |
764 | } | |
765 | if (big_endian) | |
766 | { | |
767 | elfcpp::Ehdr<32, true> ehdr(p); | |
768 | return make_elf_sized_object<32, true>(name, input_file, | |
769 | offset, ehdr); | |
770 | } | |
771 | else | |
772 | { | |
773 | elfcpp::Ehdr<32, false> ehdr(p); | |
774 | return make_elf_sized_object<32, false>(name, input_file, | |
775 | offset, ehdr); | |
776 | } | |
777 | } | |
778 | else | |
779 | { | |
780 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
781 | { | |
782 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
783 | program_name, name.c_str()); | |
784 | gold_exit(false); | |
785 | } | |
786 | if (big_endian) | |
787 | { | |
788 | elfcpp::Ehdr<64, true> ehdr(p); | |
789 | return make_elf_sized_object<64, true>(name, input_file, | |
790 | offset, ehdr); | |
791 | } | |
792 | else | |
793 | { | |
794 | elfcpp::Ehdr<64, false> ehdr(p); | |
795 | return make_elf_sized_object<64, false>(name, input_file, | |
796 | offset, ehdr); | |
797 | } | |
798 | } | |
799 | } | |
800 | ||
801 | // Instantiate the templates we need. We could use the configure | |
802 | // script to restrict this to only the ones for implemented targets. | |
803 | ||
804 | template | |
805 | class Sized_object<32, false>; | |
806 | ||
807 | template | |
808 | class Sized_object<32, true>; | |
809 | ||
810 | template | |
811 | class Sized_object<64, false>; | |
812 | ||
813 | template | |
814 | class Sized_object<64, true>; | |
815 | ||
816 | } // End namespace gold. |