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 | ||
14bfc3f5 | 9 | #include "target-select.h" |
a2fb1b05 | 10 | #include "layout.h" |
61ba1cf9 | 11 | #include "output.h" |
f6ce93d6 ILT |
12 | #include "symtab.h" |
13 | #include "object.h" | |
14 | #include "dynobj.h" | |
bae7f79e ILT |
15 | |
16 | namespace gold | |
17 | { | |
18 | ||
f6ce93d6 | 19 | // Class Sized_relobj. |
bae7f79e ILT |
20 | |
21 | template<int size, bool big_endian> | |
f6ce93d6 | 22 | Sized_relobj<size, big_endian>::Sized_relobj( |
bae7f79e ILT |
23 | const std::string& name, |
24 | Input_file* input_file, | |
25 | off_t offset, | |
26 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
f6ce93d6 | 27 | : Relobj(name, input_file, offset), |
12e14209 | 28 | section_headers_(NULL), |
bae7f79e | 29 | flags_(ehdr.get_e_flags()), |
bae7f79e | 30 | shoff_(ehdr.get_e_shoff()), |
bae7f79e | 31 | shstrndx_(0), |
14bfc3f5 | 32 | symtab_shnum_(0), |
61ba1cf9 ILT |
33 | local_symbol_count_(0), |
34 | output_local_symbol_count_(0), | |
75f65a3e | 35 | symbols_(NULL), |
61ba1cf9 ILT |
36 | local_symbol_offset_(0), |
37 | values_(NULL) | |
bae7f79e | 38 | { |
a2fb1b05 | 39 | if (ehdr.get_e_ehsize() != This::ehdr_size) |
bae7f79e ILT |
40 | { |
41 | fprintf(stderr, _("%s: %s: bad e_ehsize field (%d != %d)\n"), | |
42 | program_name, this->name().c_str(), ehdr.get_e_ehsize(), | |
a2fb1b05 | 43 | This::ehdr_size); |
bae7f79e ILT |
44 | gold_exit(false); |
45 | } | |
a2fb1b05 | 46 | if (ehdr.get_e_shentsize() != This::shdr_size) |
bae7f79e ILT |
47 | { |
48 | fprintf(stderr, _("%s: %s: bad e_shentsize field (%d != %d)\n"), | |
49 | program_name, this->name().c_str(), ehdr.get_e_shentsize(), | |
a2fb1b05 | 50 | This::shdr_size); |
bae7f79e ILT |
51 | gold_exit(false); |
52 | } | |
53 | } | |
54 | ||
55 | template<int size, bool big_endian> | |
f6ce93d6 | 56 | Sized_relobj<size, big_endian>::~Sized_relobj() |
bae7f79e ILT |
57 | { |
58 | } | |
59 | ||
75f65a3e ILT |
60 | // Read the section header for section SHNUM. |
61 | ||
62 | template<int size, bool big_endian> | |
ead1e424 | 63 | inline const unsigned char* |
f6ce93d6 | 64 | Sized_relobj<size, big_endian>::section_header(unsigned int shnum) |
75f65a3e | 65 | { |
61ba1cf9 | 66 | assert(shnum < this->shnum()); |
75f65a3e ILT |
67 | off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size; |
68 | return this->get_view(symtabshdroff, This::shdr_size); | |
69 | } | |
70 | ||
f6ce93d6 ILT |
71 | // Return the name of section SHNUM. The object must already be |
72 | // locked. | |
92e059d8 ILT |
73 | |
74 | template<int size, bool big_endian> | |
75 | std::string | |
f6ce93d6 | 76 | Sized_relobj<size, big_endian>::do_section_name(unsigned int shnum) |
92e059d8 | 77 | { |
92e059d8 ILT |
78 | // Read the section names. |
79 | typename This::Shdr shdrnames(this->section_header(this->shstrndx_)); | |
80 | const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(), | |
81 | shdrnames.get_sh_size()); | |
82 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
83 | ||
84 | typename This::Shdr shdr(this->section_header(shnum)); | |
85 | if (shdr.get_sh_name() >= shdrnames.get_sh_size()) | |
86 | { | |
87 | fprintf(stderr, | |
88 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
89 | program_name, this->name().c_str(), shnum, | |
90 | static_cast<unsigned long>(shdr.get_sh_name())); | |
91 | gold_exit(false); | |
92 | } | |
93 | ||
94 | return std::string(pnames + shdr.get_sh_name()); | |
95 | } | |
96 | ||
f6ce93d6 ILT |
97 | // Return a view of the contents of section SHNUM. The object does |
98 | // not have to be locked. | |
99 | ||
100 | template<int size, bool big_endian> | |
101 | const unsigned char* | |
102 | Sized_relobj<size, big_endian>::do_section_contents(unsigned int shnum, | |
103 | off_t* plen) | |
104 | { | |
105 | Task_locker_obj<Object> tl(*this); | |
106 | ||
107 | typename This::Shdr shdr(this->section_header(shnum)); | |
108 | *plen = shdr.get_sh_size(); | |
109 | return this->get_view(shdr.get_sh_offset(), shdr.get_sh_size()); | |
110 | } | |
111 | ||
bae7f79e ILT |
112 | // Set up an object file bsaed on the file header. This sets up the |
113 | // target and reads the section information. | |
114 | ||
115 | template<int size, bool big_endian> | |
116 | void | |
f6ce93d6 | 117 | Sized_relobj<size, big_endian>::setup( |
bae7f79e ILT |
118 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
119 | { | |
a2fb1b05 ILT |
120 | int machine = ehdr.get_e_machine(); |
121 | Target* target = select_target(machine, size, big_endian, | |
122 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
123 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
14bfc3f5 ILT |
124 | if (target == NULL) |
125 | { | |
126 | fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"), | |
a2fb1b05 | 127 | program_name, this->name().c_str(), machine); |
14bfc3f5 ILT |
128 | gold_exit(false); |
129 | } | |
130 | this->set_target(target); | |
12e14209 | 131 | |
bae7f79e ILT |
132 | unsigned int shnum = ehdr.get_e_shnum(); |
133 | unsigned int shstrndx = ehdr.get_e_shstrndx(); | |
134 | if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX) | |
135 | && this->shoff_ != 0) | |
136 | { | |
75f65a3e | 137 | typename This::Shdr shdr(this->section_header(0)); |
bae7f79e ILT |
138 | if (shnum == 0) |
139 | shnum = shdr.get_sh_size(); | |
140 | if (shstrndx == elfcpp::SHN_XINDEX) | |
141 | shstrndx = shdr.get_sh_link(); | |
142 | } | |
a2fb1b05 | 143 | this->set_shnum(shnum); |
bae7f79e ILT |
144 | this->shstrndx_ = shstrndx; |
145 | ||
146 | if (shnum == 0) | |
147 | return; | |
148 | ||
12e14209 ILT |
149 | // We store the section headers in a File_view until do_read_symbols. |
150 | this->section_headers_ = this->get_lasting_view(this->shoff_, | |
151 | shnum * This::shdr_size); | |
152 | ||
153 | // Find the SHT_SYMTAB section. The ELF standard says that maybe in | |
154 | // the future there can be more than one SHT_SYMTAB section. Until | |
155 | // somebody figures out how that could work, we assume there is only | |
156 | // one. | |
157 | const unsigned char* p = this->section_headers_->data(); | |
158 | ||
bae7f79e | 159 | // Skip the first section, which is always empty. |
a2fb1b05 | 160 | p += This::shdr_size; |
12e14209 | 161 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) |
bae7f79e | 162 | { |
75f65a3e | 163 | typename This::Shdr shdr(p); |
bae7f79e ILT |
164 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
165 | { | |
166 | this->symtab_shnum_ = i; | |
167 | break; | |
168 | } | |
bae7f79e ILT |
169 | } |
170 | } | |
171 | ||
12e14209 | 172 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
173 | |
174 | template<int size, bool big_endian> | |
12e14209 | 175 | void |
f6ce93d6 | 176 | Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 177 | { |
12e14209 ILT |
178 | // Transfer our view of the section headers to SD. |
179 | sd->section_headers = this->section_headers_; | |
180 | this->section_headers_ = NULL; | |
181 | ||
182 | // Read the section names. | |
183 | const unsigned char* pshdrs = sd->section_headers->data(); | |
184 | const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size; | |
185 | typename This::Shdr shdrnames(pshdrnames); | |
186 | sd->section_names_size = shdrnames.get_sh_size(); | |
187 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), | |
188 | sd->section_names_size); | |
189 | ||
bae7f79e ILT |
190 | if (this->symtab_shnum_ == 0) |
191 | { | |
192 | // No symbol table. Weird but legal. | |
12e14209 ILT |
193 | sd->symbols = NULL; |
194 | sd->symbols_size = 0; | |
195 | sd->symbol_names = NULL; | |
196 | sd->symbol_names_size = 0; | |
197 | return; | |
bae7f79e ILT |
198 | } |
199 | ||
12e14209 ILT |
200 | // Get the symbol table section header. |
201 | typename This::Shdr symtabshdr(pshdrs | |
202 | + this->symtab_shnum_ * This::shdr_size); | |
bae7f79e ILT |
203 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
204 | ||
75f65a3e ILT |
205 | // We only need the external symbols. |
206 | const int sym_size = This::sym_size; | |
92e059d8 ILT |
207 | const unsigned int loccount = symtabshdr.get_sh_info(); |
208 | this->local_symbol_count_ = loccount; | |
209 | off_t locsize = loccount * sym_size; | |
75f65a3e ILT |
210 | off_t extoff = symtabshdr.get_sh_offset() + locsize; |
211 | off_t extsize = symtabshdr.get_sh_size() - locsize; | |
212 | ||
bae7f79e | 213 | // Read the symbol table. |
75f65a3e | 214 | File_view* fvsymtab = this->get_lasting_view(extoff, extsize); |
bae7f79e ILT |
215 | |
216 | // Read the section header for the symbol names. | |
92e059d8 | 217 | unsigned int shnum = this->shnum(); |
bae7f79e | 218 | unsigned int strtab_shnum = symtabshdr.get_sh_link(); |
92e059d8 | 219 | if (strtab_shnum == 0 || strtab_shnum >= shnum) |
bae7f79e ILT |
220 | { |
221 | fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"), | |
222 | program_name, this->name().c_str(), strtab_shnum); | |
223 | gold_exit(false); | |
224 | } | |
92e059d8 | 225 | typename This::Shdr strtabshdr(pshdrs + strtab_shnum * This::shdr_size); |
bae7f79e ILT |
226 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
227 | { | |
228 | fprintf(stderr, | |
229 | _("%s: %s: symbol table name section has wrong type: %u\n"), | |
230 | program_name, this->name().c_str(), | |
231 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
232 | gold_exit(false); | |
233 | } | |
234 | ||
235 | // Read the symbol names. | |
236 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
237 | strtabshdr.get_sh_size()); | |
238 | ||
12e14209 ILT |
239 | sd->symbols = fvsymtab; |
240 | sd->symbols_size = extsize; | |
241 | sd->symbol_names = fvstrtab; | |
242 | sd->symbol_names_size = strtabshdr.get_sh_size(); | |
a2fb1b05 ILT |
243 | } |
244 | ||
245 | // Return whether to include a section group in the link. LAYOUT is | |
246 | // used to keep track of which section groups we have already seen. | |
247 | // INDEX is the index of the section group and SHDR is the section | |
248 | // header. If we do not want to include this group, we set bits in | |
249 | // OMIT for each section which should be discarded. | |
250 | ||
251 | template<int size, bool big_endian> | |
252 | bool | |
f6ce93d6 | 253 | Sized_relobj<size, big_endian>::include_section_group( |
a2fb1b05 ILT |
254 | Layout* layout, |
255 | unsigned int index, | |
256 | const elfcpp::Shdr<size, big_endian>& shdr, | |
257 | std::vector<bool>* omit) | |
258 | { | |
259 | // Read the section contents. | |
260 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
261 | shdr.get_sh_size()); | |
262 | const elfcpp::Elf_Word* pword = | |
263 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
264 | ||
265 | // The first word contains flags. We only care about COMDAT section | |
266 | // groups. Other section groups are always included in the link | |
267 | // just like ordinary sections. | |
f6ce93d6 | 268 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 ILT |
269 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
270 | return true; | |
271 | ||
272 | // Look up the group signature, which is the name of a symbol. This | |
273 | // is a lot of effort to go to to read a string. Why didn't they | |
274 | // just use the name of the SHT_GROUP section as the group | |
275 | // signature? | |
276 | ||
277 | // Get the appropriate symbol table header (this will normally be | |
278 | // the single SHT_SYMTAB section, but in principle it need not be). | |
279 | if (shdr.get_sh_link() >= this->shnum()) | |
280 | { | |
281 | fprintf(stderr, _("%s: %s: section group %u link %u out of range\n"), | |
282 | program_name, this->name().c_str(), index, shdr.get_sh_link()); | |
283 | gold_exit(false); | |
284 | } | |
75f65a3e ILT |
285 | |
286 | typename This::Shdr symshdr(this->section_header(shdr.get_sh_link())); | |
a2fb1b05 ILT |
287 | |
288 | // Read the symbol table entry. | |
289 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
290 | { | |
291 | fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"), | |
292 | program_name, this->name().c_str(), index, shdr.get_sh_info()); | |
293 | gold_exit(false); | |
294 | } | |
295 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
296 | const unsigned char* psym = this->get_view(symoff, This::sym_size); | |
297 | elfcpp::Sym<size, big_endian> sym(psym); | |
298 | ||
299 | // Read the section header for the symbol table names. | |
300 | if (symshdr.get_sh_link() >= this->shnum()) | |
301 | { | |
302 | fprintf(stderr, _("%s; %s: symtab section %u link %u out of range\n"), | |
303 | program_name, this->name().c_str(), shdr.get_sh_link(), | |
304 | symshdr.get_sh_link()); | |
305 | gold_exit(false); | |
306 | } | |
75f65a3e ILT |
307 | |
308 | typename This::Shdr symnamehdr(this->section_header(symshdr.get_sh_link())); | |
a2fb1b05 ILT |
309 | |
310 | // Read the symbol table names. | |
311 | const unsigned char *psymnamesu = this->get_view(symnamehdr.get_sh_offset(), | |
312 | symnamehdr.get_sh_size()); | |
313 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); | |
314 | ||
315 | // Get the section group signature. | |
316 | if (sym.get_st_name() >= symnamehdr.get_sh_size()) | |
317 | { | |
318 | fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"), | |
319 | program_name, this->name().c_str(), shdr.get_sh_info(), | |
320 | sym.get_st_name()); | |
321 | gold_exit(false); | |
322 | } | |
323 | ||
324 | const char* signature = psymnames + sym.get_st_name(); | |
325 | ||
ead1e424 ILT |
326 | // It seems that some versions of gas will create a section group |
327 | // associated with a section symbol, and then fail to give a name to | |
328 | // the section symbol. In such a case, use the name of the section. | |
329 | // FIXME. | |
330 | if (signature[0] == '\0' | |
331 | && sym.get_st_type() == elfcpp::STT_SECTION | |
332 | && sym.get_st_shndx() < this->shnum()) | |
333 | { | |
334 | typename This::Shdr shdrnames(this->section_header(this->shstrndx_)); | |
335 | const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(), | |
336 | shdrnames.get_sh_size()); | |
337 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
338 | ||
339 | typename This::Shdr sechdr(this->section_header(sym.get_st_shndx())); | |
340 | if (sechdr.get_sh_name() >= shdrnames.get_sh_size()) | |
341 | { | |
342 | fprintf(stderr, | |
343 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
344 | program_name, this->name().c_str(), sym.get_st_shndx(), | |
345 | static_cast<unsigned long>(sechdr.get_sh_name())); | |
346 | gold_exit(false); | |
347 | } | |
348 | ||
349 | signature = pnames + sechdr.get_sh_name(); | |
350 | } | |
351 | ||
a2fb1b05 ILT |
352 | // Record this section group, and see whether we've already seen one |
353 | // with the same signature. | |
354 | if (layout->add_comdat(signature, true)) | |
355 | return true; | |
356 | ||
357 | // This is a duplicate. We want to discard the sections in this | |
358 | // group. | |
359 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
360 | for (size_t i = 1; i < count; ++i) | |
361 | { | |
f6ce93d6 ILT |
362 | elfcpp::Elf_Word secnum = |
363 | elfcpp::Swap<32, big_endian>::readval(pword + i); | |
a2fb1b05 ILT |
364 | if (secnum >= this->shnum()) |
365 | { | |
366 | fprintf(stderr, | |
367 | _("%s: %s: section %u in section group %u out of range"), | |
368 | program_name, this->name().c_str(), secnum, | |
369 | index); | |
370 | gold_exit(false); | |
371 | } | |
372 | (*omit)[secnum] = true; | |
373 | } | |
374 | ||
375 | return false; | |
376 | } | |
377 | ||
378 | // Whether to include a linkonce section in the link. NAME is the | |
379 | // name of the section and SHDR is the section header. | |
380 | ||
381 | // Linkonce sections are a GNU extension implemented in the original | |
382 | // GNU linker before section groups were defined. The semantics are | |
383 | // that we only include one linkonce section with a given name. The | |
384 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
385 | // where T is the type of section and SYMNAME is the name of a symbol. | |
386 | // In an attempt to make linkonce sections interact well with section | |
387 | // groups, we try to identify SYMNAME and use it like a section group | |
388 | // signature. We want to block section groups with that signature, | |
389 | // but not other linkonce sections with that signature. We also use | |
390 | // the full name of the linkonce section as a normal section group | |
391 | // signature. | |
392 | ||
393 | template<int size, bool big_endian> | |
394 | bool | |
f6ce93d6 | 395 | Sized_relobj<size, big_endian>::include_linkonce_section( |
a2fb1b05 ILT |
396 | Layout* layout, |
397 | const char* name, | |
398 | const elfcpp::Shdr<size, big_endian>&) | |
399 | { | |
400 | const char* symname = strrchr(name, '.') + 1; | |
a783673b ILT |
401 | bool include1 = layout->add_comdat(symname, false); |
402 | bool include2 = layout->add_comdat(name, true); | |
403 | return include1 && include2; | |
a2fb1b05 ILT |
404 | } |
405 | ||
406 | // Lay out the input sections. We walk through the sections and check | |
407 | // whether they should be included in the link. If they should, we | |
408 | // pass them to the Layout object, which will return an output section | |
409 | // and an offset. | |
410 | ||
411 | template<int size, bool big_endian> | |
412 | void | |
f6ce93d6 ILT |
413 | Sized_relobj<size, big_endian>::do_layout(const General_options& options, |
414 | Symbol_table* symtab, | |
415 | Layout* layout, | |
12e14209 | 416 | Read_symbols_data* sd) |
a2fb1b05 | 417 | { |
12e14209 ILT |
418 | unsigned int shnum = this->shnum(); |
419 | if (shnum == 0) | |
420 | return; | |
a2fb1b05 ILT |
421 | |
422 | // Get the section headers. | |
12e14209 | 423 | const unsigned char* pshdrs = sd->section_headers->data(); |
a2fb1b05 ILT |
424 | |
425 | // Get the section names. | |
12e14209 | 426 | const unsigned char* pnamesu = sd->section_names->data(); |
a2fb1b05 ILT |
427 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
428 | ||
429 | std::vector<Map_to_output>& map_sections(this->map_to_output()); | |
61ba1cf9 | 430 | map_sections.resize(shnum); |
a2fb1b05 ILT |
431 | |
432 | // Keep track of which sections to omit. | |
433 | std::vector<bool> omit(shnum, false); | |
434 | ||
f6ce93d6 ILT |
435 | const char warn_prefix[] = ".gnu.warning."; |
436 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
437 | ||
438 | // Skip the first, dummy, section. | |
439 | pshdrs += This::shdr_size; | |
440 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) | |
a2fb1b05 | 441 | { |
75f65a3e | 442 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 443 | |
12e14209 | 444 | if (shdr.get_sh_name() >= sd->section_names_size) |
a2fb1b05 ILT |
445 | { |
446 | fprintf(stderr, | |
447 | _("%s: %s: bad section name offset for section %u: %lu\n"), | |
448 | program_name, this->name().c_str(), i, | |
449 | static_cast<unsigned long>(shdr.get_sh_name())); | |
450 | gold_exit(false); | |
451 | } | |
452 | ||
453 | const char* name = pnames + shdr.get_sh_name(); | |
454 | ||
f6ce93d6 ILT |
455 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
456 | { | |
457 | symtab->add_warning(name + warn_prefix_len, this, i); | |
458 | if (!options.is_relocatable()) | |
459 | omit[i] = true; | |
460 | } | |
461 | ||
a2fb1b05 ILT |
462 | bool discard = omit[i]; |
463 | if (!discard) | |
464 | { | |
465 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
466 | { | |
467 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
468 | discard = true; | |
469 | } | |
470 | else if (Layout::is_linkonce(name)) | |
471 | { | |
472 | if (!this->include_linkonce_section(layout, name, shdr)) | |
473 | discard = true; | |
474 | } | |
475 | } | |
476 | ||
477 | if (discard) | |
478 | { | |
479 | // Do not include this section in the link. | |
480 | map_sections[i].output_section = NULL; | |
481 | continue; | |
482 | } | |
483 | ||
484 | off_t offset; | |
ead1e424 | 485 | Output_section* os = layout->layout(this, i, name, shdr, &offset); |
a2fb1b05 ILT |
486 | |
487 | map_sections[i].output_section = os; | |
488 | map_sections[i].offset = offset; | |
12e14209 ILT |
489 | } |
490 | ||
491 | delete sd->section_headers; | |
492 | sd->section_headers = NULL; | |
493 | delete sd->section_names; | |
494 | sd->section_names = NULL; | |
495 | } | |
496 | ||
497 | // Add the symbols to the symbol table. | |
498 | ||
499 | template<int size, bool big_endian> | |
500 | void | |
f6ce93d6 | 501 | Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
12e14209 ILT |
502 | Read_symbols_data* sd) |
503 | { | |
504 | if (sd->symbols == NULL) | |
505 | { | |
506 | assert(sd->symbol_names == NULL); | |
507 | return; | |
508 | } | |
a2fb1b05 | 509 | |
12e14209 ILT |
510 | const int sym_size = This::sym_size; |
511 | size_t symcount = sd->symbols_size / sym_size; | |
512 | if (symcount * sym_size != sd->symbols_size) | |
513 | { | |
514 | fprintf(stderr, | |
515 | _("%s: %s: size of symbols is not multiple of symbol size\n"), | |
516 | program_name, this->name().c_str()); | |
517 | gold_exit(false); | |
a2fb1b05 | 518 | } |
12e14209 ILT |
519 | |
520 | this->symbols_ = new Symbol*[symcount]; | |
521 | ||
12e14209 ILT |
522 | const char* sym_names = |
523 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
f6ce93d6 ILT |
524 | symtab->add_from_object<size, big_endian>(this, sd->symbols->data(), |
525 | symcount, sym_names, | |
526 | sd->symbol_names_size, | |
527 | this->symbols_); | |
12e14209 ILT |
528 | |
529 | delete sd->symbols; | |
530 | sd->symbols = NULL; | |
531 | delete sd->symbol_names; | |
532 | sd->symbol_names = NULL; | |
bae7f79e ILT |
533 | } |
534 | ||
75f65a3e | 535 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 ILT |
536 | // which they should be output, we add their names to *POOL, and we |
537 | // add their values to THIS->VALUES_. Return the new file offset. | |
538 | // This function is always called from the main thread. The actual | |
539 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
540 | |
541 | template<int size, bool big_endian> | |
542 | off_t | |
f6ce93d6 | 543 | Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off, |
75f65a3e ILT |
544 | Stringpool* pool) |
545 | { | |
61ba1cf9 ILT |
546 | if (this->symtab_shnum_ == 0) |
547 | { | |
548 | // This object has no symbols. Weird but legal. | |
549 | return off; | |
550 | } | |
551 | ||
ead1e424 | 552 | off = align_address(off, size >> 3); |
61ba1cf9 | 553 | |
75f65a3e ILT |
554 | this->local_symbol_offset_ = off; |
555 | ||
556 | // Read the symbol table section header. | |
557 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
558 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
559 | ||
560 | // Read the local symbols. | |
75f65a3e | 561 | const int sym_size = This::sym_size; |
92e059d8 ILT |
562 | const unsigned int loccount = this->local_symbol_count_; |
563 | assert(loccount == symtabshdr.get_sh_info()); | |
75f65a3e ILT |
564 | off_t locsize = loccount * sym_size; |
565 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
566 | locsize); | |
567 | ||
61ba1cf9 ILT |
568 | this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount]; |
569 | ||
75f65a3e ILT |
570 | // Read the section header for the symbol names. |
571 | typename This::Shdr strtabshdr( | |
572 | this->section_header(symtabshdr.get_sh_link())); | |
573 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
574 | ||
575 | // Read the symbol names. | |
576 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
577 | strtabshdr.get_sh_size()); | |
578 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
579 | ||
580 | // Loop over the local symbols. | |
581 | ||
582 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
583 | unsigned int shnum = this->shnum(); | |
61ba1cf9 | 584 | unsigned int count = 0; |
75f65a3e ILT |
585 | // Skip the first, dummy, symbol. |
586 | psyms += sym_size; | |
61ba1cf9 | 587 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
588 | { |
589 | elfcpp::Sym<size, big_endian> sym(psyms); | |
590 | ||
591 | unsigned int shndx = sym.get_st_shndx(); | |
592 | ||
593 | if (shndx >= elfcpp::SHN_LORESERVE) | |
594 | { | |
61ba1cf9 ILT |
595 | if (shndx == elfcpp::SHN_ABS) |
596 | this->values_[i] = sym.get_st_value(); | |
597 | else | |
75f65a3e | 598 | { |
61ba1cf9 | 599 | // FIXME: Handle SHN_XINDEX. |
75f65a3e ILT |
600 | fprintf(stderr, |
601 | _("%s: %s: unknown section index %u " | |
602 | "for local symbol %u\n"), | |
603 | program_name, this->name().c_str(), shndx, i); | |
604 | gold_exit(false); | |
605 | } | |
75f65a3e ILT |
606 | } |
607 | else | |
608 | { | |
609 | if (shndx >= shnum) | |
610 | { | |
611 | fprintf(stderr, | |
612 | _("%s: %s: local symbol %u section index %u " | |
613 | "out of range\n"), | |
614 | program_name, this->name().c_str(), i, shndx); | |
615 | gold_exit(false); | |
616 | } | |
617 | ||
618 | if (mo[shndx].output_section == NULL) | |
61ba1cf9 ILT |
619 | { |
620 | this->values_[i] = 0; | |
621 | continue; | |
622 | } | |
623 | ||
624 | this->values_[i] = (mo[shndx].output_section->address() | |
ead1e424 | 625 | + mo[shndx].offset |
61ba1cf9 | 626 | + sym.get_st_value()); |
75f65a3e ILT |
627 | } |
628 | ||
f6ce93d6 ILT |
629 | if (sym.get_st_type() != elfcpp::STT_SECTION) |
630 | { | |
f0641a0b | 631 | pool->add(pnames + sym.get_st_name(), NULL); |
f6ce93d6 ILT |
632 | off += sym_size; |
633 | ++count; | |
634 | } | |
75f65a3e ILT |
635 | } |
636 | ||
61ba1cf9 ILT |
637 | this->output_local_symbol_count_ = count; |
638 | ||
75f65a3e ILT |
639 | return off; |
640 | } | |
641 | ||
61ba1cf9 ILT |
642 | // Write out the local symbols. |
643 | ||
644 | template<int size, bool big_endian> | |
645 | void | |
f6ce93d6 | 646 | Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of, |
61ba1cf9 ILT |
647 | const Stringpool* sympool) |
648 | { | |
649 | if (this->symtab_shnum_ == 0) | |
650 | { | |
651 | // This object has no symbols. Weird but legal. | |
652 | return; | |
653 | } | |
654 | ||
655 | // Read the symbol table section header. | |
656 | typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_)); | |
657 | assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
92e059d8 ILT |
658 | const unsigned int loccount = this->local_symbol_count_; |
659 | assert(loccount == symtabshdr.get_sh_info()); | |
61ba1cf9 ILT |
660 | |
661 | // Read the local symbols. | |
662 | const int sym_size = This::sym_size; | |
92e059d8 | 663 | off_t locsize = loccount * sym_size; |
61ba1cf9 ILT |
664 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
665 | locsize); | |
666 | ||
667 | // Read the section header for the symbol names. | |
668 | typename This::Shdr strtabshdr( | |
669 | this->section_header(symtabshdr.get_sh_link())); | |
670 | assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB); | |
671 | ||
672 | // Read the symbol names. | |
673 | const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(), | |
674 | strtabshdr.get_sh_size()); | |
675 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
676 | ||
677 | // Get a view into the output file. | |
678 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
679 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
680 | output_size); | |
681 | ||
682 | std::vector<Map_to_output>& mo(this->map_to_output()); | |
683 | ||
684 | psyms += sym_size; | |
685 | unsigned char* ov = oview; | |
92e059d8 | 686 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
61ba1cf9 ILT |
687 | { |
688 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 ILT |
689 | |
690 | if (isym.get_st_type() == elfcpp::STT_SECTION) | |
691 | continue; | |
61ba1cf9 ILT |
692 | |
693 | unsigned int st_shndx = isym.get_st_shndx(); | |
694 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
695 | { | |
696 | assert(st_shndx < mo.size()); | |
697 | if (mo[st_shndx].output_section == NULL) | |
698 | continue; | |
ead1e424 | 699 | st_shndx = mo[st_shndx].output_section->out_shndx(); |
61ba1cf9 ILT |
700 | } |
701 | ||
f6ce93d6 ILT |
702 | elfcpp::Sym_write<size, big_endian> osym(ov); |
703 | ||
61ba1cf9 ILT |
704 | osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name())); |
705 | osym.put_st_value(this->values_[i]); | |
706 | osym.put_st_size(isym.get_st_size()); | |
707 | osym.put_st_info(isym.get_st_info()); | |
708 | osym.put_st_other(isym.get_st_other()); | |
709 | osym.put_st_shndx(st_shndx); | |
710 | ||
711 | ov += sym_size; | |
712 | } | |
713 | ||
714 | assert(ov - oview == output_size); | |
715 | ||
716 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
717 | } | |
718 | ||
54dc6425 ILT |
719 | // Input_objects methods. |
720 | ||
f6ce93d6 ILT |
721 | // Add a regular relocatable object to the list. |
722 | ||
54dc6425 ILT |
723 | void |
724 | Input_objects::add_object(Object* obj) | |
725 | { | |
f6ce93d6 ILT |
726 | if (obj->is_dynamic()) |
727 | this->dynobj_list_.push_back(static_cast<Dynobj*>(obj)); | |
728 | else | |
729 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); | |
75f65a3e ILT |
730 | |
731 | Target* target = obj->target(); | |
732 | if (this->target_ == NULL) | |
733 | this->target_ = target; | |
734 | else if (this->target_ != target) | |
735 | { | |
736 | fprintf(stderr, "%s: %s: incompatible target\n", | |
737 | program_name, obj->name().c_str()); | |
738 | gold_exit(false); | |
739 | } | |
54dc6425 ILT |
740 | } |
741 | ||
92e059d8 ILT |
742 | // Relocate_info methods. |
743 | ||
744 | // Return a string describing the location of a relocation. This is | |
745 | // only used in error messages. | |
746 | ||
747 | template<int size, bool big_endian> | |
748 | std::string | |
749 | Relocate_info<size, big_endian>::location(size_t relnum, off_t) const | |
750 | { | |
751 | std::string ret(this->object->name()); | |
752 | ret += ": reloc "; | |
753 | char buf[100]; | |
754 | snprintf(buf, sizeof buf, "%zu", relnum); | |
755 | ret += buf; | |
756 | ret += " in reloc section "; | |
757 | snprintf(buf, sizeof buf, "%u", this->reloc_shndx); | |
758 | ret += buf; | |
759 | ret += " (" + this->object->section_name(this->reloc_shndx); | |
760 | ret += ") for section "; | |
761 | snprintf(buf, sizeof buf, "%u", this->data_shndx); | |
762 | ret += buf; | |
763 | ret += " (" + this->object->section_name(this->data_shndx) + ")"; | |
764 | return ret; | |
765 | } | |
766 | ||
bae7f79e ILT |
767 | } // End namespace gold. |
768 | ||
769 | namespace | |
770 | { | |
771 | ||
772 | using namespace gold; | |
773 | ||
774 | // Read an ELF file with the header and return the appropriate | |
775 | // instance of Object. | |
776 | ||
777 | template<int size, bool big_endian> | |
778 | Object* | |
779 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
780 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
781 | { | |
782 | int et = ehdr.get_e_type(); | |
783 | if (et != elfcpp::ET_REL && et != elfcpp::ET_DYN) | |
784 | { | |
785 | fprintf(stderr, "%s: %s: unsupported ELF type %d\n", | |
786 | program_name, name.c_str(), static_cast<int>(et)); | |
787 | gold_exit(false); | |
788 | } | |
789 | ||
790 | if (et == elfcpp::ET_REL) | |
791 | { | |
f6ce93d6 ILT |
792 | Sized_relobj<size, big_endian>* obj = |
793 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
bae7f79e ILT |
794 | obj->setup(ehdr); |
795 | return obj; | |
796 | } | |
797 | else | |
798 | { | |
799 | // elfcpp::ET_DYN | |
800 | fprintf(stderr, _("%s: %s: dynamic objects are not yet supported\n"), | |
801 | program_name, name.c_str()); | |
802 | gold_exit(false); | |
803 | // Sized_dynobj<size, big_endian>* obj = | |
804 | // new Sized_dynobj<size, big_endian>(this->input_.name(), input_file, | |
805 | // offset, ehdr); | |
806 | // obj->setup(ehdr); | |
807 | // return obj; | |
808 | } | |
809 | } | |
810 | ||
811 | } // End anonymous namespace. | |
812 | ||
813 | namespace gold | |
814 | { | |
815 | ||
816 | // Read an ELF file and return the appropriate instance of Object. | |
817 | ||
818 | Object* | |
819 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
820 | const unsigned char* p, off_t bytes) | |
821 | { | |
822 | if (bytes < elfcpp::EI_NIDENT) | |
823 | { | |
824 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
825 | program_name, name.c_str()); | |
826 | gold_exit(false); | |
827 | } | |
828 | ||
829 | int v = p[elfcpp::EI_VERSION]; | |
830 | if (v != elfcpp::EV_CURRENT) | |
831 | { | |
832 | if (v == elfcpp::EV_NONE) | |
833 | fprintf(stderr, _("%s: %s: invalid ELF version 0\n"), | |
834 | program_name, name.c_str()); | |
835 | else | |
836 | fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"), | |
837 | program_name, name.c_str(), v); | |
838 | gold_exit(false); | |
839 | } | |
840 | ||
841 | int c = p[elfcpp::EI_CLASS]; | |
842 | if (c == elfcpp::ELFCLASSNONE) | |
843 | { | |
844 | fprintf(stderr, _("%s: %s: invalid ELF class 0\n"), | |
845 | program_name, name.c_str()); | |
846 | gold_exit(false); | |
847 | } | |
848 | else if (c != elfcpp::ELFCLASS32 | |
849 | && c != elfcpp::ELFCLASS64) | |
850 | { | |
851 | fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"), | |
852 | program_name, name.c_str(), c); | |
853 | gold_exit(false); | |
854 | } | |
855 | ||
856 | int d = p[elfcpp::EI_DATA]; | |
857 | if (d == elfcpp::ELFDATANONE) | |
858 | { | |
859 | fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"), | |
860 | program_name, name.c_str()); | |
861 | gold_exit(false); | |
862 | } | |
863 | else if (d != elfcpp::ELFDATA2LSB | |
864 | && d != elfcpp::ELFDATA2MSB) | |
865 | { | |
866 | fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"), | |
867 | program_name, name.c_str(), d); | |
868 | gold_exit(false); | |
869 | } | |
870 | ||
871 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
872 | ||
873 | if (c == elfcpp::ELFCLASS32) | |
874 | { | |
875 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
876 | { | |
877 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
878 | program_name, name.c_str()); | |
879 | gold_exit(false); | |
880 | } | |
881 | if (big_endian) | |
882 | { | |
883 | elfcpp::Ehdr<32, true> ehdr(p); | |
884 | return make_elf_sized_object<32, true>(name, input_file, | |
885 | offset, ehdr); | |
886 | } | |
887 | else | |
888 | { | |
889 | elfcpp::Ehdr<32, false> ehdr(p); | |
890 | return make_elf_sized_object<32, false>(name, input_file, | |
891 | offset, ehdr); | |
892 | } | |
893 | } | |
894 | else | |
895 | { | |
896 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
897 | { | |
898 | fprintf(stderr, _("%s: %s: ELF file too short\n"), | |
899 | program_name, name.c_str()); | |
900 | gold_exit(false); | |
901 | } | |
902 | if (big_endian) | |
903 | { | |
904 | elfcpp::Ehdr<64, true> ehdr(p); | |
905 | return make_elf_sized_object<64, true>(name, input_file, | |
906 | offset, ehdr); | |
907 | } | |
908 | else | |
909 | { | |
910 | elfcpp::Ehdr<64, false> ehdr(p); | |
911 | return make_elf_sized_object<64, false>(name, input_file, | |
912 | offset, ehdr); | |
913 | } | |
914 | } | |
915 | } | |
916 | ||
917 | // Instantiate the templates we need. We could use the configure | |
918 | // script to restrict this to only the ones for implemented targets. | |
919 | ||
920 | template | |
f6ce93d6 | 921 | class Sized_relobj<32, false>; |
bae7f79e ILT |
922 | |
923 | template | |
f6ce93d6 | 924 | class Sized_relobj<32, true>; |
bae7f79e ILT |
925 | |
926 | template | |
f6ce93d6 | 927 | class Sized_relobj<64, false>; |
bae7f79e ILT |
928 | |
929 | template | |
f6ce93d6 | 930 | class Sized_relobj<64, true>; |
bae7f79e | 931 | |
92e059d8 ILT |
932 | template |
933 | struct Relocate_info<32, false>; | |
934 | ||
935 | template | |
936 | struct Relocate_info<32, true>; | |
937 | ||
938 | template | |
939 | struct Relocate_info<64, false>; | |
940 | ||
941 | template | |
942 | struct Relocate_info<64, true>; | |
943 | ||
bae7f79e | 944 | } // End namespace gold. |