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> | |
645f8123 | 8 | #include <cstdarg> |
bae7f79e | 9 | |
14bfc3f5 | 10 | #include "target-select.h" |
a2fb1b05 | 11 | #include "layout.h" |
61ba1cf9 | 12 | #include "output.h" |
f6ce93d6 ILT |
13 | #include "symtab.h" |
14 | #include "object.h" | |
15 | #include "dynobj.h" | |
bae7f79e ILT |
16 | |
17 | namespace gold | |
18 | { | |
19 | ||
645f8123 ILT |
20 | // Class Object. |
21 | ||
dbe717ef ILT |
22 | // Set the target based on fields in the ELF file header. |
23 | ||
24 | void | |
25 | Object::set_target(int machine, int size, bool big_endian, int osabi, | |
26 | int abiversion) | |
27 | { | |
28 | Target* target = select_target(machine, size, big_endian, osabi, abiversion); | |
29 | if (target == NULL) | |
30 | { | |
31 | fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"), | |
32 | program_name, this->name().c_str(), machine); | |
33 | gold_exit(false); | |
34 | } | |
35 | this->target_ = target; | |
36 | } | |
37 | ||
645f8123 ILT |
38 | // Report an error for the elfcpp::Elf_file interface. |
39 | ||
40 | void | |
41 | Object::error(const char* format, ...) | |
42 | { | |
43 | va_list args; | |
44 | ||
45 | fprintf(stderr, "%s: %s: ", program_name, this->name().c_str()); | |
46 | va_start(args, format); | |
47 | vfprintf(stderr, format, args); | |
48 | va_end(args); | |
49 | putc('\n', stderr); | |
50 | ||
51 | gold_exit(false); | |
52 | } | |
53 | ||
54 | // Return a view of the contents of a section. | |
55 | ||
56 | const unsigned char* | |
57 | Object::section_contents(unsigned int shndx, off_t* plen) | |
58 | { | |
59 | Location loc(this->do_section_contents(shndx)); | |
60 | *plen = loc.data_size; | |
61 | return this->get_view(loc.file_offset, loc.data_size); | |
62 | } | |
63 | ||
dbe717ef ILT |
64 | // Read the section data into SD. This is code common to Sized_relobj |
65 | // and Sized_dynobj, so we put it into Object. | |
66 | ||
67 | template<int size, bool big_endian> | |
68 | void | |
69 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
70 | Read_symbols_data* sd) | |
71 | { | |
72 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
73 | ||
74 | // Read the section headers. | |
75 | const off_t shoff = elf_file->shoff(); | |
76 | const unsigned int shnum = this->shnum(); | |
77 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size); | |
78 | ||
79 | // Read the section names. | |
80 | const unsigned char* pshdrs = sd->section_headers->data(); | |
81 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
82 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
83 | ||
84 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
85 | { | |
86 | fprintf(stderr, | |
87 | _("%s: %s: section name section has wrong type: %u\n"), | |
88 | program_name, this->name().c_str(), | |
89 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
90 | gold_exit(false); | |
91 | } | |
92 | ||
93 | sd->section_names_size = shdrnames.get_sh_size(); | |
94 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), | |
95 | sd->section_names_size); | |
96 | } | |
97 | ||
98 | // If NAME is the name of a special .gnu.warning section, arrange for | |
99 | // the warning to be issued. SHNDX is the section index. Return | |
100 | // whether it is a warning section. | |
101 | ||
102 | bool | |
103 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, | |
104 | Symbol_table* symtab) | |
105 | { | |
106 | const char warn_prefix[] = ".gnu.warning."; | |
107 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
108 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) | |
109 | { | |
110 | symtab->add_warning(name + warn_prefix_len, this, shndx); | |
111 | return true; | |
112 | } | |
113 | return false; | |
114 | } | |
115 | ||
f6ce93d6 | 116 | // Class Sized_relobj. |
bae7f79e ILT |
117 | |
118 | template<int size, bool big_endian> | |
f6ce93d6 | 119 | Sized_relobj<size, big_endian>::Sized_relobj( |
bae7f79e ILT |
120 | const std::string& name, |
121 | Input_file* input_file, | |
122 | off_t offset, | |
123 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
f6ce93d6 | 124 | : Relobj(name, input_file, offset), |
645f8123 | 125 | elf_file_(this, ehdr), |
dbe717ef | 126 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
127 | local_symbol_count_(0), |
128 | output_local_symbol_count_(0), | |
75f65a3e | 129 | symbols_(NULL), |
61ba1cf9 ILT |
130 | local_symbol_offset_(0), |
131 | values_(NULL) | |
bae7f79e | 132 | { |
bae7f79e ILT |
133 | } |
134 | ||
135 | template<int size, bool big_endian> | |
f6ce93d6 | 136 | Sized_relobj<size, big_endian>::~Sized_relobj() |
bae7f79e ILT |
137 | { |
138 | } | |
139 | ||
645f8123 | 140 | // Set up an object file based on the file header. This sets up the |
bae7f79e ILT |
141 | // target and reads the section information. |
142 | ||
143 | template<int size, bool big_endian> | |
144 | void | |
f6ce93d6 | 145 | Sized_relobj<size, big_endian>::setup( |
bae7f79e ILT |
146 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
147 | { | |
dbe717ef ILT |
148 | this->set_target(ehdr.get_e_machine(), size, big_endian, |
149 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
150 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
12e14209 | 151 | |
dbe717ef | 152 | const unsigned int shnum = this->elf_file_.shnum(); |
a2fb1b05 | 153 | this->set_shnum(shnum); |
dbe717ef | 154 | } |
12e14209 | 155 | |
dbe717ef ILT |
156 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
157 | // standard says that maybe in the future there can be more than one | |
158 | // SHT_SYMTAB section. Until somebody figures out how that could | |
159 | // work, we assume there is only one. | |
12e14209 | 160 | |
dbe717ef ILT |
161 | template<int size, bool big_endian> |
162 | void | |
163 | Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) | |
164 | { | |
165 | const unsigned int shnum = this->shnum(); | |
166 | this->symtab_shndx_ = 0; | |
167 | if (shnum > 0) | |
bae7f79e | 168 | { |
dbe717ef ILT |
169 | // Look through the sections in reverse order, since gas tends |
170 | // to put the symbol table at the end. | |
171 | const unsigned char* p = pshdrs + shnum * This::shdr_size; | |
172 | unsigned int i = shnum; | |
173 | while (i > 0) | |
bae7f79e | 174 | { |
dbe717ef ILT |
175 | --i; |
176 | p -= This::shdr_size; | |
177 | typename This::Shdr shdr(p); | |
178 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
179 | { | |
180 | this->symtab_shndx_ = i; | |
181 | break; | |
182 | } | |
bae7f79e | 183 | } |
bae7f79e ILT |
184 | } |
185 | } | |
186 | ||
12e14209 | 187 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
188 | |
189 | template<int size, bool big_endian> | |
12e14209 | 190 | void |
f6ce93d6 | 191 | Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 192 | { |
dbe717ef | 193 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 194 | |
dbe717ef ILT |
195 | const unsigned char* const pshdrs = sd->section_headers->data(); |
196 | ||
197 | this->find_symtab(pshdrs); | |
12e14209 | 198 | |
645f8123 | 199 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
200 | { |
201 | // No symbol table. Weird but legal. | |
12e14209 ILT |
202 | sd->symbols = NULL; |
203 | sd->symbols_size = 0; | |
204 | sd->symbol_names = NULL; | |
205 | sd->symbol_names_size = 0; | |
206 | return; | |
bae7f79e ILT |
207 | } |
208 | ||
12e14209 ILT |
209 | // Get the symbol table section header. |
210 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 211 | + this->symtab_shndx_ * This::shdr_size); |
bae7f79e ILT |
212 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
213 | ||
75f65a3e ILT |
214 | // We only need the external symbols. |
215 | const int sym_size = This::sym_size; | |
92e059d8 ILT |
216 | const unsigned int loccount = symtabshdr.get_sh_info(); |
217 | this->local_symbol_count_ = loccount; | |
218 | off_t locsize = loccount * sym_size; | |
75f65a3e ILT |
219 | off_t extoff = symtabshdr.get_sh_offset() + locsize; |
220 | off_t extsize = symtabshdr.get_sh_size() - locsize; | |
221 | ||
bae7f79e | 222 | // Read the symbol table. |
75f65a3e | 223 | File_view* fvsymtab = this->get_lasting_view(extoff, extsize); |
bae7f79e ILT |
224 | |
225 | // Read the section header for the symbol names. | |
dbe717ef ILT |
226 | unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
227 | if (strtab_shndx >= this->shnum()) | |
bae7f79e ILT |
228 | { |
229 | fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"), | |
dbe717ef | 230 | program_name, this->name().c_str(), strtab_shndx); |
bae7f79e ILT |
231 | gold_exit(false); |
232 | } | |
dbe717ef | 233 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
234 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
235 | { | |
236 | fprintf(stderr, | |
237 | _("%s: %s: symbol table name section has wrong type: %u\n"), | |
238 | program_name, this->name().c_str(), | |
239 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
240 | gold_exit(false); | |
241 | } | |
242 | ||
243 | // Read the symbol names. | |
244 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
245 | strtabshdr.get_sh_size()); | |
246 | ||
12e14209 ILT |
247 | sd->symbols = fvsymtab; |
248 | sd->symbols_size = extsize; | |
249 | sd->symbol_names = fvstrtab; | |
250 | sd->symbol_names_size = strtabshdr.get_sh_size(); | |
a2fb1b05 ILT |
251 | } |
252 | ||
253 | // Return whether to include a section group in the link. LAYOUT is | |
254 | // used to keep track of which section groups we have already seen. | |
255 | // INDEX is the index of the section group and SHDR is the section | |
256 | // header. If we do not want to include this group, we set bits in | |
257 | // OMIT for each section which should be discarded. | |
258 | ||
259 | template<int size, bool big_endian> | |
260 | bool | |
f6ce93d6 | 261 | Sized_relobj<size, big_endian>::include_section_group( |
a2fb1b05 ILT |
262 | Layout* layout, |
263 | unsigned int index, | |
264 | const elfcpp::Shdr<size, big_endian>& shdr, | |
265 | std::vector<bool>* omit) | |
266 | { | |
267 | // Read the section contents. | |
268 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
269 | shdr.get_sh_size()); | |
270 | const elfcpp::Elf_Word* pword = | |
271 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
272 | ||
273 | // The first word contains flags. We only care about COMDAT section | |
274 | // groups. Other section groups are always included in the link | |
275 | // just like ordinary sections. | |
f6ce93d6 | 276 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 ILT |
277 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
278 | return true; | |
279 | ||
280 | // Look up the group signature, which is the name of a symbol. This | |
281 | // is a lot of effort to go to to read a string. Why didn't they | |
282 | // just use the name of the SHT_GROUP section as the group | |
283 | // signature? | |
284 | ||
285 | // Get the appropriate symbol table header (this will normally be | |
286 | // the single SHT_SYMTAB section, but in principle it need not be). | |
645f8123 ILT |
287 | const unsigned int link = shdr.get_sh_link(); |
288 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); | |
a2fb1b05 ILT |
289 | |
290 | // Read the symbol table entry. | |
291 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
292 | { | |
293 | fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"), | |
294 | program_name, this->name().c_str(), index, shdr.get_sh_info()); | |
295 | gold_exit(false); | |
296 | } | |
297 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
298 | const unsigned char* psym = this->get_view(symoff, This::sym_size); | |
299 | elfcpp::Sym<size, big_endian> sym(psym); | |
300 | ||
a2fb1b05 | 301 | // Read the symbol table names. |
645f8123 ILT |
302 | off_t symnamelen; |
303 | const unsigned char* psymnamesu; | |
304 | psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen); | |
a2fb1b05 ILT |
305 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
306 | ||
307 | // Get the section group signature. | |
645f8123 | 308 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 ILT |
309 | { |
310 | fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"), | |
311 | program_name, this->name().c_str(), shdr.get_sh_info(), | |
312 | sym.get_st_name()); | |
313 | gold_exit(false); | |
314 | } | |
315 | ||
316 | const char* signature = psymnames + sym.get_st_name(); | |
317 | ||
ead1e424 ILT |
318 | // It seems that some versions of gas will create a section group |
319 | // associated with a section symbol, and then fail to give a name to | |
320 | // the section symbol. In such a case, use the name of the section. | |
321 | // FIXME. | |
645f8123 ILT |
322 | std::string secname; |
323 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) | |
ead1e424 | 324 | { |
645f8123 ILT |
325 | secname = this->section_name(sym.get_st_shndx()); |
326 | signature = secname.c_str(); | |
ead1e424 ILT |
327 | } |
328 | ||
a2fb1b05 ILT |
329 | // Record this section group, and see whether we've already seen one |
330 | // with the same signature. | |
331 | if (layout->add_comdat(signature, true)) | |
332 | return true; | |
333 | ||
334 | // This is a duplicate. We want to discard the sections in this | |
335 | // group. | |
336 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
337 | for (size_t i = 1; i < count; ++i) | |
338 | { | |
f6ce93d6 ILT |
339 | elfcpp::Elf_Word secnum = |
340 | elfcpp::Swap<32, big_endian>::readval(pword + i); | |
a2fb1b05 ILT |
341 | if (secnum >= this->shnum()) |
342 | { | |
343 | fprintf(stderr, | |
344 | _("%s: %s: section %u in section group %u out of range"), | |
345 | program_name, this->name().c_str(), secnum, | |
346 | index); | |
347 | gold_exit(false); | |
348 | } | |
349 | (*omit)[secnum] = true; | |
350 | } | |
351 | ||
352 | return false; | |
353 | } | |
354 | ||
355 | // Whether to include a linkonce section in the link. NAME is the | |
356 | // name of the section and SHDR is the section header. | |
357 | ||
358 | // Linkonce sections are a GNU extension implemented in the original | |
359 | // GNU linker before section groups were defined. The semantics are | |
360 | // that we only include one linkonce section with a given name. The | |
361 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
362 | // where T is the type of section and SYMNAME is the name of a symbol. | |
363 | // In an attempt to make linkonce sections interact well with section | |
364 | // groups, we try to identify SYMNAME and use it like a section group | |
365 | // signature. We want to block section groups with that signature, | |
366 | // but not other linkonce sections with that signature. We also use | |
367 | // the full name of the linkonce section as a normal section group | |
368 | // signature. | |
369 | ||
370 | template<int size, bool big_endian> | |
371 | bool | |
f6ce93d6 | 372 | Sized_relobj<size, big_endian>::include_linkonce_section( |
a2fb1b05 ILT |
373 | Layout* layout, |
374 | const char* name, | |
375 | const elfcpp::Shdr<size, big_endian>&) | |
376 | { | |
377 | const char* symname = strrchr(name, '.') + 1; | |
a783673b ILT |
378 | bool include1 = layout->add_comdat(symname, false); |
379 | bool include2 = layout->add_comdat(name, true); | |
380 | return include1 && include2; | |
a2fb1b05 ILT |
381 | } |
382 | ||
383 | // Lay out the input sections. We walk through the sections and check | |
384 | // whether they should be included in the link. If they should, we | |
385 | // pass them to the Layout object, which will return an output section | |
386 | // and an offset. | |
387 | ||
388 | template<int size, bool big_endian> | |
389 | void | |
f6ce93d6 ILT |
390 | Sized_relobj<size, big_endian>::do_layout(const General_options& options, |
391 | Symbol_table* symtab, | |
392 | Layout* layout, | |
12e14209 | 393 | Read_symbols_data* sd) |
a2fb1b05 | 394 | { |
dbe717ef | 395 | const unsigned int shnum = this->shnum(); |
12e14209 ILT |
396 | if (shnum == 0) |
397 | return; | |
a2fb1b05 ILT |
398 | |
399 | // Get the section headers. | |
12e14209 | 400 | const unsigned char* pshdrs = sd->section_headers->data(); |
a2fb1b05 ILT |
401 | |
402 | // Get the section names. | |
12e14209 | 403 | const unsigned char* pnamesu = sd->section_names->data(); |
a2fb1b05 ILT |
404 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
405 | ||
406 | std::vector<Map_to_output>& map_sections(this->map_to_output()); | |
61ba1cf9 | 407 | map_sections.resize(shnum); |
a2fb1b05 ILT |
408 | |
409 | // Keep track of which sections to omit. | |
410 | std::vector<bool> omit(shnum, false); | |
411 | ||
f6ce93d6 ILT |
412 | // Skip the first, dummy, section. |
413 | pshdrs += This::shdr_size; | |
414 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) | |
a2fb1b05 | 415 | { |
75f65a3e | 416 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 417 | |
12e14209 | 418 | if (shdr.get_sh_name() >= sd->section_names_size) |
a2fb1b05 ILT |
419 | { |
420 | fprintf(stderr, | |
421 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
422 | program_name, this->name().c_str(), i, | |
423 | static_cast<unsigned long>(shdr.get_sh_name())); | |
424 | gold_exit(false); | |
425 | } | |
426 | ||
427 | const char* name = pnames + shdr.get_sh_name(); | |
428 | ||
dbe717ef | 429 | if (this->handle_gnu_warning_section(name, i, symtab)) |
f6ce93d6 | 430 | { |
f6ce93d6 ILT |
431 | if (!options.is_relocatable()) |
432 | omit[i] = true; | |
433 | } | |
434 | ||
a2fb1b05 ILT |
435 | bool discard = omit[i]; |
436 | if (!discard) | |
437 | { | |
438 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
439 | { | |
440 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
441 | discard = true; | |
442 | } | |
443 | else if (Layout::is_linkonce(name)) | |
444 | { | |
445 | if (!this->include_linkonce_section(layout, name, shdr)) | |
446 | discard = true; | |
447 | } | |
448 | } | |
449 | ||
450 | if (discard) | |
451 | { | |
452 | // Do not include this section in the link. | |
453 | map_sections[i].output_section = NULL; | |
454 | continue; | |
455 | } | |
456 | ||
457 | off_t offset; | |
ead1e424 | 458 | Output_section* os = layout->layout(this, i, name, shdr, &offset); |
a2fb1b05 ILT |
459 | |
460 | map_sections[i].output_section = os; | |
461 | map_sections[i].offset = offset; | |
12e14209 ILT |
462 | } |
463 | ||
464 | delete sd->section_headers; | |
465 | sd->section_headers = NULL; | |
466 | delete sd->section_names; | |
467 | sd->section_names = NULL; | |
468 | } | |
469 | ||
470 | // Add the symbols to the symbol table. | |
471 | ||
472 | template<int size, bool big_endian> | |
473 | void | |
f6ce93d6 | 474 | Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
12e14209 ILT |
475 | Read_symbols_data* sd) |
476 | { | |
477 | if (sd->symbols == NULL) | |
478 | { | |
479 | assert(sd->symbol_names == NULL); | |
480 | return; | |
481 | } | |
a2fb1b05 | 482 | |
12e14209 ILT |
483 | const int sym_size = This::sym_size; |
484 | size_t symcount = sd->symbols_size / sym_size; | |
485 | if (symcount * sym_size != sd->symbols_size) | |
486 | { | |
487 | fprintf(stderr, | |
488 | _("%s: %s: size of symbols is not multiple of symbol size\n"), | |
489 | program_name, this->name().c_str()); | |
490 | gold_exit(false); | |
a2fb1b05 | 491 | } |
12e14209 ILT |
492 | |
493 | this->symbols_ = new Symbol*[symcount]; | |
494 | ||
12e14209 ILT |
495 | const char* sym_names = |
496 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
dbe717ef ILT |
497 | symtab->add_from_relobj(this, sd->symbols->data(), symcount, sym_names, |
498 | sd->symbol_names_size, this->symbols_); | |
12e14209 ILT |
499 | |
500 | delete sd->symbols; | |
501 | sd->symbols = NULL; | |
502 | delete sd->symbol_names; | |
503 | sd->symbol_names = NULL; | |
bae7f79e ILT |
504 | } |
505 | ||
75f65a3e | 506 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 ILT |
507 | // which they should be output, we add their names to *POOL, and we |
508 | // add their values to THIS->VALUES_. Return the new file offset. | |
509 | // This function is always called from the main thread. The actual | |
510 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
511 | |
512 | template<int size, bool big_endian> | |
513 | off_t | |
f6ce93d6 | 514 | Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off, |
75f65a3e ILT |
515 | Stringpool* pool) |
516 | { | |
dbe717ef | 517 | assert(this->symtab_shndx_ != -1U); |
645f8123 | 518 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
519 | { |
520 | // This object has no symbols. Weird but legal. | |
521 | return off; | |
522 | } | |
523 | ||
ead1e424 | 524 | off = align_address(off, size >> 3); |
61ba1cf9 | 525 | |
75f65a3e ILT |
526 | this->local_symbol_offset_ = off; |
527 | ||
528 | // Read the symbol table section header. | |
645f8123 ILT |
529 | const unsigned int symtab_shndx = this->symtab_shndx_; |
530 | typename This::Shdr symtabshdr(this, | |
531 | this->elf_file_.section_header(symtab_shndx)); | |
75f65a3e ILT |
532 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
533 | ||
534 | // Read the local symbols. | |
75f65a3e | 535 | const int sym_size = This::sym_size; |
92e059d8 ILT |
536 | const unsigned int loccount = this->local_symbol_count_; |
537 | assert(loccount == symtabshdr.get_sh_info()); | |
75f65a3e ILT |
538 | off_t locsize = loccount * sym_size; |
539 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
540 | locsize); | |
541 | ||
61ba1cf9 ILT |
542 | this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount]; |
543 | ||
75f65a3e | 544 | // Read the symbol names. |
645f8123 ILT |
545 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
546 | off_t strtab_size; | |
547 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
548 | &strtab_size); | |
75f65a3e ILT |
549 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
550 | ||
551 | // Loop over the local symbols. | |
552 | ||
553 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
554 | unsigned int shnum = this->shnum(); | |
61ba1cf9 | 555 | unsigned int count = 0; |
75f65a3e ILT |
556 | // Skip the first, dummy, symbol. |
557 | psyms += sym_size; | |
61ba1cf9 | 558 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
559 | { |
560 | elfcpp::Sym<size, big_endian> sym(psyms); | |
561 | ||
562 | unsigned int shndx = sym.get_st_shndx(); | |
563 | ||
564 | if (shndx >= elfcpp::SHN_LORESERVE) | |
565 | { | |
61ba1cf9 ILT |
566 | if (shndx == elfcpp::SHN_ABS) |
567 | this->values_[i] = sym.get_st_value(); | |
568 | else | |
75f65a3e | 569 | { |
61ba1cf9 | 570 | // FIXME: Handle SHN_XINDEX. |
75f65a3e ILT |
571 | fprintf(stderr, |
572 | _("%s: %s: unknown section index %u " | |
573 | "for local symbol %u\n"), | |
574 | program_name, this->name().c_str(), shndx, i); | |
575 | gold_exit(false); | |
576 | } | |
75f65a3e ILT |
577 | } |
578 | else | |
579 | { | |
580 | if (shndx >= shnum) | |
581 | { | |
582 | fprintf(stderr, | |
583 | _("%s: %s: local symbol %u section index %u " | |
584 | "out of range\n"), | |
585 | program_name, this->name().c_str(), i, shndx); | |
586 | gold_exit(false); | |
587 | } | |
588 | ||
589 | if (mo[shndx].output_section == NULL) | |
61ba1cf9 ILT |
590 | { |
591 | this->values_[i] = 0; | |
592 | continue; | |
593 | } | |
594 | ||
595 | this->values_[i] = (mo[shndx].output_section->address() | |
ead1e424 | 596 | + mo[shndx].offset |
61ba1cf9 | 597 | + sym.get_st_value()); |
75f65a3e ILT |
598 | } |
599 | ||
f6ce93d6 ILT |
600 | if (sym.get_st_type() != elfcpp::STT_SECTION) |
601 | { | |
645f8123 ILT |
602 | if (sym.get_st_name() >= strtab_size) |
603 | { | |
604 | fprintf(stderr, | |
605 | _("%s: %s: local symbol %u section name " | |
606 | "out of range: %u >= %u\n"), | |
607 | program_name, this->name().c_str(), | |
608 | i, sym.get_st_name(), | |
609 | static_cast<unsigned int>(strtab_size)); | |
610 | gold_exit(false); | |
611 | } | |
612 | ||
f0641a0b | 613 | pool->add(pnames + sym.get_st_name(), NULL); |
f6ce93d6 ILT |
614 | off += sym_size; |
615 | ++count; | |
616 | } | |
75f65a3e ILT |
617 | } |
618 | ||
61ba1cf9 ILT |
619 | this->output_local_symbol_count_ = count; |
620 | ||
75f65a3e ILT |
621 | return off; |
622 | } | |
623 | ||
61ba1cf9 ILT |
624 | // Write out the local symbols. |
625 | ||
626 | template<int size, bool big_endian> | |
627 | void | |
f6ce93d6 | 628 | Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of, |
61ba1cf9 ILT |
629 | const Stringpool* sympool) |
630 | { | |
dbe717ef | 631 | assert(this->symtab_shndx_ != -1U); |
645f8123 | 632 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
633 | { |
634 | // This object has no symbols. Weird but legal. | |
635 | return; | |
636 | } | |
637 | ||
638 | // Read the symbol table section header. | |
645f8123 ILT |
639 | const unsigned int symtab_shndx = this->symtab_shndx_; |
640 | typename This::Shdr symtabshdr(this, | |
641 | this->elf_file_.section_header(symtab_shndx)); | |
61ba1cf9 | 642 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 ILT |
643 | const unsigned int loccount = this->local_symbol_count_; |
644 | assert(loccount == symtabshdr.get_sh_info()); | |
61ba1cf9 ILT |
645 | |
646 | // Read the local symbols. | |
647 | const int sym_size = This::sym_size; | |
92e059d8 | 648 | off_t locsize = loccount * sym_size; |
61ba1cf9 ILT |
649 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
650 | locsize); | |
651 | ||
61ba1cf9 | 652 | // Read the symbol names. |
645f8123 ILT |
653 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
654 | off_t strtab_size; | |
655 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
656 | &strtab_size); | |
61ba1cf9 ILT |
657 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
658 | ||
659 | // Get a view into the output file. | |
660 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
661 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
662 | output_size); | |
663 | ||
664 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
665 | ||
666 | psyms += sym_size; | |
667 | unsigned char* ov = oview; | |
92e059d8 | 668 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
61ba1cf9 ILT |
669 | { |
670 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 ILT |
671 | |
672 | if (isym.get_st_type() == elfcpp::STT_SECTION) | |
673 | continue; | |
61ba1cf9 ILT |
674 | |
675 | unsigned int st_shndx = isym.get_st_shndx(); | |
676 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
677 | { | |
678 | assert(st_shndx < mo.size()); | |
679 | if (mo[st_shndx].output_section == NULL) | |
680 | continue; | |
ead1e424 | 681 | st_shndx = mo[st_shndx].output_section->out_shndx(); |
61ba1cf9 ILT |
682 | } |
683 | ||
f6ce93d6 ILT |
684 | elfcpp::Sym_write<size, big_endian> osym(ov); |
685 | ||
645f8123 | 686 | assert(isym.get_st_name() < strtab_size); |
61ba1cf9 ILT |
687 | osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name())); |
688 | osym.put_st_value(this->values_[i]); | |
689 | osym.put_st_size(isym.get_st_size()); | |
690 | osym.put_st_info(isym.get_st_info()); | |
691 | osym.put_st_other(isym.get_st_other()); | |
692 | osym.put_st_shndx(st_shndx); | |
693 | ||
694 | ov += sym_size; | |
695 | } | |
696 | ||
697 | assert(ov - oview == output_size); | |
698 | ||
699 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
700 | } | |
701 | ||
54dc6425 ILT |
702 | // Input_objects methods. |
703 | ||
f6ce93d6 ILT |
704 | // Add a regular relocatable object to the list. |
705 | ||
54dc6425 ILT |
706 | void |
707 | Input_objects::add_object(Object* obj) | |
708 | { | |
f6ce93d6 ILT |
709 | if (obj->is_dynamic()) |
710 | this->dynobj_list_.push_back(static_cast<Dynobj*>(obj)); | |
711 | else | |
712 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); | |
75f65a3e ILT |
713 | |
714 | Target* target = obj->target(); | |
715 | if (this->target_ == NULL) | |
716 | this->target_ = target; | |
717 | else if (this->target_ != target) | |
718 | { | |
719 | fprintf(stderr, "%s: %s: incompatible target\n", | |
720 | program_name, obj->name().c_str()); | |
721 | gold_exit(false); | |
722 | } | |
54dc6425 ILT |
723 | } |
724 | ||
92e059d8 ILT |
725 | // Relocate_info methods. |
726 | ||
727 | // Return a string describing the location of a relocation. This is | |
728 | // only used in error messages. | |
729 | ||
730 | template<int size, bool big_endian> | |
731 | std::string | |
732 | Relocate_info<size, big_endian>::location(size_t relnum, off_t) const | |
733 | { | |
734 | std::string ret(this->object->name()); | |
735 | ret += ": reloc "; | |
736 | char buf[100]; | |
737 | snprintf(buf, sizeof buf, "%zu", relnum); | |
738 | ret += buf; | |
739 | ret += " in reloc section "; | |
740 | snprintf(buf, sizeof buf, "%u", this->reloc_shndx); | |
741 | ret += buf; | |
742 | ret += " (" + this->object->section_name(this->reloc_shndx); | |
743 | ret += ") for section "; | |
744 | snprintf(buf, sizeof buf, "%u", this->data_shndx); | |
745 | ret += buf; | |
746 | ret += " (" + this->object->section_name(this->data_shndx) + ")"; | |
747 | return ret; | |
748 | } | |
749 | ||
bae7f79e ILT |
750 | } // End namespace gold. |
751 | ||
752 | namespace | |
753 | { | |
754 | ||
755 | using namespace gold; | |
756 | ||
757 | // Read an ELF file with the header and return the appropriate | |
758 | // instance of Object. | |
759 | ||
760 | template<int size, bool big_endian> | |
761 | Object* | |
762 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
763 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
764 | { | |
765 | int et = ehdr.get_e_type(); | |
bae7f79e ILT |
766 | if (et == elfcpp::ET_REL) |
767 | { | |
f6ce93d6 ILT |
768 | Sized_relobj<size, big_endian>* obj = |
769 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
bae7f79e ILT |
770 | obj->setup(ehdr); |
771 | return obj; | |
772 | } | |
dbe717ef ILT |
773 | else if (et == elfcpp::ET_DYN) |
774 | { | |
775 | Sized_dynobj<size, big_endian>* obj = | |
776 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
777 | obj->setup(ehdr); | |
778 | return obj; | |
779 | } | |
bae7f79e ILT |
780 | else |
781 | { | |
dbe717ef ILT |
782 | fprintf(stderr, _("%s: %s: unsupported ELF file type %d\n"), |
783 | program_name, name.c_str(), et); | |
bae7f79e | 784 | gold_exit(false); |
bae7f79e ILT |
785 | } |
786 | } | |
787 | ||
788 | } // End anonymous namespace. | |
789 | ||
790 | namespace gold | |
791 | { | |
792 | ||
793 | // Read an ELF file and return the appropriate instance of Object. | |
794 | ||
795 | Object* | |
796 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
797 | const unsigned char* p, off_t bytes) | |
798 | { | |
799 | if (bytes < elfcpp::EI_NIDENT) | |
800 | { | |
801 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
802 | program_name, name.c_str()); | |
803 | gold_exit(false); | |
804 | } | |
805 | ||
806 | int v = p[elfcpp::EI_VERSION]; | |
807 | if (v != elfcpp::EV_CURRENT) | |
808 | { | |
809 | if (v == elfcpp::EV_NONE) | |
810 | fprintf(stderr, _("%s: %s: invalid ELF version 0\n"), | |
811 | program_name, name.c_str()); | |
812 | else | |
813 | fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"), | |
814 | program_name, name.c_str(), v); | |
815 | gold_exit(false); | |
816 | } | |
817 | ||
818 | int c = p[elfcpp::EI_CLASS]; | |
819 | if (c == elfcpp::ELFCLASSNONE) | |
820 | { | |
821 | fprintf(stderr, _("%s: %s: invalid ELF class 0\n"), | |
822 | program_name, name.c_str()); | |
823 | gold_exit(false); | |
824 | } | |
825 | else if (c != elfcpp::ELFCLASS32 | |
826 | && c != elfcpp::ELFCLASS64) | |
827 | { | |
828 | fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"), | |
829 | program_name, name.c_str(), c); | |
830 | gold_exit(false); | |
831 | } | |
832 | ||
833 | int d = p[elfcpp::EI_DATA]; | |
834 | if (d == elfcpp::ELFDATANONE) | |
835 | { | |
836 | fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"), | |
837 | program_name, name.c_str()); | |
838 | gold_exit(false); | |
839 | } | |
840 | else if (d != elfcpp::ELFDATA2LSB | |
841 | && d != elfcpp::ELFDATA2MSB) | |
842 | { | |
843 | fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"), | |
844 | program_name, name.c_str(), d); | |
845 | gold_exit(false); | |
846 | } | |
847 | ||
848 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
849 | ||
850 | if (c == elfcpp::ELFCLASS32) | |
851 | { | |
852 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
853 | { | |
854 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
855 | program_name, name.c_str()); | |
856 | gold_exit(false); | |
857 | } | |
858 | if (big_endian) | |
859 | { | |
860 | elfcpp::Ehdr<32, true> ehdr(p); | |
861 | return make_elf_sized_object<32, true>(name, input_file, | |
862 | offset, ehdr); | |
863 | } | |
864 | else | |
865 | { | |
866 | elfcpp::Ehdr<32, false> ehdr(p); | |
867 | return make_elf_sized_object<32, false>(name, input_file, | |
868 | offset, ehdr); | |
869 | } | |
870 | } | |
871 | else | |
872 | { | |
873 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
874 | { | |
875 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
876 | program_name, name.c_str()); | |
877 | gold_exit(false); | |
878 | } | |
879 | if (big_endian) | |
880 | { | |
881 | elfcpp::Ehdr<64, true> ehdr(p); | |
882 | return make_elf_sized_object<64, true>(name, input_file, | |
883 | offset, ehdr); | |
884 | } | |
885 | else | |
886 | { | |
887 | elfcpp::Ehdr<64, false> ehdr(p); | |
888 | return make_elf_sized_object<64, false>(name, input_file, | |
889 | offset, ehdr); | |
890 | } | |
891 | } | |
892 | } | |
893 | ||
894 | // Instantiate the templates we need. We could use the configure | |
895 | // script to restrict this to only the ones for implemented targets. | |
896 | ||
897 | template | |
f6ce93d6 | 898 | class Sized_relobj<32, false>; |
bae7f79e ILT |
899 | |
900 | template | |
f6ce93d6 | 901 | class Sized_relobj<32, true>; |
bae7f79e ILT |
902 | |
903 | template | |
f6ce93d6 | 904 | class Sized_relobj<64, false>; |
bae7f79e ILT |
905 | |
906 | template | |
f6ce93d6 | 907 | class Sized_relobj<64, true>; |
bae7f79e | 908 | |
92e059d8 ILT |
909 | template |
910 | struct Relocate_info<32, false>; | |
911 | ||
912 | template | |
913 | struct Relocate_info<32, true>; | |
914 | ||
915 | template | |
916 | struct Relocate_info<64, false>; | |
917 | ||
918 | template | |
919 | struct Relocate_info<64, true>; | |
920 | ||
bae7f79e | 921 | } // End namespace gold. |