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bae7f79e ILT |
1 | // object.cc -- support for an object file for linking in gold |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
23 | #include "gold.h" |
24 | ||
25 | #include <cerrno> | |
26 | #include <cstring> | |
645f8123 | 27 | #include <cstdarg> |
bae7f79e | 28 | |
14bfc3f5 | 29 | #include "target-select.h" |
5c2c6c95 | 30 | #include "dwarf_reader.h" |
a2fb1b05 | 31 | #include "layout.h" |
61ba1cf9 | 32 | #include "output.h" |
f6ce93d6 | 33 | #include "symtab.h" |
4c50553d | 34 | #include "reloc.h" |
f6ce93d6 ILT |
35 | #include "object.h" |
36 | #include "dynobj.h" | |
bae7f79e ILT |
37 | |
38 | namespace gold | |
39 | { | |
40 | ||
645f8123 ILT |
41 | // Class Object. |
42 | ||
dbe717ef ILT |
43 | // Set the target based on fields in the ELF file header. |
44 | ||
45 | void | |
46 | Object::set_target(int machine, int size, bool big_endian, int osabi, | |
47 | int abiversion) | |
48 | { | |
49 | Target* target = select_target(machine, size, big_endian, osabi, abiversion); | |
50 | if (target == NULL) | |
75f2446e ILT |
51 | gold_fatal(_("%s: unsupported ELF machine number %d"), |
52 | this->name().c_str(), machine); | |
dbe717ef ILT |
53 | this->target_ = target; |
54 | } | |
55 | ||
75f2446e ILT |
56 | // Report an error for this object file. This is used by the |
57 | // elfcpp::Elf_file interface, and also called by the Object code | |
58 | // itself. | |
645f8123 ILT |
59 | |
60 | void | |
75f2446e | 61 | Object::error(const char* format, ...) const |
645f8123 ILT |
62 | { |
63 | va_list args; | |
645f8123 | 64 | va_start(args, format); |
75f2446e ILT |
65 | char* buf = NULL; |
66 | if (vasprintf(&buf, format, args) < 0) | |
67 | gold_nomem(); | |
645f8123 | 68 | va_end(args); |
75f2446e ILT |
69 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
70 | free(buf); | |
645f8123 ILT |
71 | } |
72 | ||
73 | // Return a view of the contents of a section. | |
74 | ||
75 | const unsigned char* | |
9eb9fa57 | 76 | Object::section_contents(unsigned int shndx, off_t* plen, bool cache) |
645f8123 ILT |
77 | { |
78 | Location loc(this->do_section_contents(shndx)); | |
79 | *plen = loc.data_size; | |
9eb9fa57 | 80 | return this->get_view(loc.file_offset, loc.data_size, cache); |
645f8123 ILT |
81 | } |
82 | ||
dbe717ef ILT |
83 | // Read the section data into SD. This is code common to Sized_relobj |
84 | // and Sized_dynobj, so we put it into Object. | |
85 | ||
86 | template<int size, bool big_endian> | |
87 | void | |
88 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
89 | Read_symbols_data* sd) | |
90 | { | |
91 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
92 | ||
93 | // Read the section headers. | |
94 | const off_t shoff = elf_file->shoff(); | |
95 | const unsigned int shnum = this->shnum(); | |
9eb9fa57 | 96 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, true); |
dbe717ef ILT |
97 | |
98 | // Read the section names. | |
99 | const unsigned char* pshdrs = sd->section_headers->data(); | |
100 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
101 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
102 | ||
103 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
75f2446e ILT |
104 | this->error(_("section name section has wrong type: %u"), |
105 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
dbe717ef ILT |
106 | |
107 | sd->section_names_size = shdrnames.get_sh_size(); | |
108 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), | |
9eb9fa57 | 109 | sd->section_names_size, false); |
dbe717ef ILT |
110 | } |
111 | ||
112 | // If NAME is the name of a special .gnu.warning section, arrange for | |
113 | // the warning to be issued. SHNDX is the section index. Return | |
114 | // whether it is a warning section. | |
115 | ||
116 | bool | |
117 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, | |
118 | Symbol_table* symtab) | |
119 | { | |
120 | const char warn_prefix[] = ".gnu.warning."; | |
121 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
122 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) | |
123 | { | |
124 | symtab->add_warning(name + warn_prefix_len, this, shndx); | |
125 | return true; | |
126 | } | |
127 | return false; | |
128 | } | |
129 | ||
f6ce93d6 | 130 | // Class Sized_relobj. |
bae7f79e ILT |
131 | |
132 | template<int size, bool big_endian> | |
f6ce93d6 | 133 | Sized_relobj<size, big_endian>::Sized_relobj( |
bae7f79e ILT |
134 | const std::string& name, |
135 | Input_file* input_file, | |
136 | off_t offset, | |
137 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
f6ce93d6 | 138 | : Relobj(name, input_file, offset), |
645f8123 | 139 | elf_file_(this, ehdr), |
dbe717ef | 140 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
141 | local_symbol_count_(0), |
142 | output_local_symbol_count_(0), | |
730cdc88 | 143 | symbols_(), |
61ba1cf9 | 144 | local_symbol_offset_(0), |
e727fa71 | 145 | local_values_(), |
730cdc88 ILT |
146 | local_got_offsets_(), |
147 | has_eh_frame_(false) | |
bae7f79e | 148 | { |
bae7f79e ILT |
149 | } |
150 | ||
151 | template<int size, bool big_endian> | |
f6ce93d6 | 152 | Sized_relobj<size, big_endian>::~Sized_relobj() |
bae7f79e ILT |
153 | { |
154 | } | |
155 | ||
645f8123 | 156 | // Set up an object file based on the file header. This sets up the |
bae7f79e ILT |
157 | // target and reads the section information. |
158 | ||
159 | template<int size, bool big_endian> | |
160 | void | |
f6ce93d6 | 161 | Sized_relobj<size, big_endian>::setup( |
bae7f79e ILT |
162 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
163 | { | |
dbe717ef ILT |
164 | this->set_target(ehdr.get_e_machine(), size, big_endian, |
165 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
166 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
12e14209 | 167 | |
dbe717ef | 168 | const unsigned int shnum = this->elf_file_.shnum(); |
a2fb1b05 | 169 | this->set_shnum(shnum); |
dbe717ef | 170 | } |
12e14209 | 171 | |
dbe717ef ILT |
172 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
173 | // standard says that maybe in the future there can be more than one | |
174 | // SHT_SYMTAB section. Until somebody figures out how that could | |
175 | // work, we assume there is only one. | |
12e14209 | 176 | |
dbe717ef ILT |
177 | template<int size, bool big_endian> |
178 | void | |
179 | Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) | |
180 | { | |
181 | const unsigned int shnum = this->shnum(); | |
182 | this->symtab_shndx_ = 0; | |
183 | if (shnum > 0) | |
bae7f79e | 184 | { |
dbe717ef ILT |
185 | // Look through the sections in reverse order, since gas tends |
186 | // to put the symbol table at the end. | |
187 | const unsigned char* p = pshdrs + shnum * This::shdr_size; | |
188 | unsigned int i = shnum; | |
189 | while (i > 0) | |
bae7f79e | 190 | { |
dbe717ef ILT |
191 | --i; |
192 | p -= This::shdr_size; | |
193 | typename This::Shdr shdr(p); | |
194 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
195 | { | |
196 | this->symtab_shndx_ = i; | |
197 | break; | |
198 | } | |
bae7f79e | 199 | } |
bae7f79e ILT |
200 | } |
201 | } | |
202 | ||
730cdc88 ILT |
203 | // Return whether SHDR has the right type and flags to be a GNU |
204 | // .eh_frame section. | |
205 | ||
206 | template<int size, bool big_endian> | |
207 | bool | |
208 | Sized_relobj<size, big_endian>::check_eh_frame_flags( | |
209 | const elfcpp::Shdr<size, big_endian>* shdr) const | |
210 | { | |
211 | return (shdr->get_sh_size() > 0 | |
212 | && shdr->get_sh_type() == elfcpp::SHT_PROGBITS | |
213 | && shdr->get_sh_flags() == elfcpp::SHF_ALLOC); | |
214 | } | |
215 | ||
216 | // Return whether there is a GNU .eh_frame section, given the section | |
217 | // headers and the section names. | |
218 | ||
219 | template<int size, bool big_endian> | |
220 | bool | |
221 | Sized_relobj<size, big_endian>::find_eh_frame(const unsigned char* pshdrs, | |
222 | const char* names, | |
223 | off_t names_size) const | |
224 | { | |
225 | const unsigned int shnum = this->shnum(); | |
226 | const unsigned char* p = pshdrs + This::shdr_size; | |
227 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
228 | { | |
229 | typename This::Shdr shdr(p); | |
230 | if (this->check_eh_frame_flags(&shdr)) | |
231 | { | |
232 | if (shdr.get_sh_name() >= names_size) | |
233 | { | |
234 | this->error(_("bad section name offset for section %u: %lu"), | |
235 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
236 | continue; | |
237 | } | |
238 | ||
239 | const char* name = names + shdr.get_sh_name(); | |
240 | if (strcmp(name, ".eh_frame") == 0) | |
241 | return true; | |
242 | } | |
243 | } | |
244 | return false; | |
245 | } | |
246 | ||
12e14209 | 247 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
248 | |
249 | template<int size, bool big_endian> | |
12e14209 | 250 | void |
f6ce93d6 | 251 | Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 252 | { |
dbe717ef | 253 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 254 | |
dbe717ef ILT |
255 | const unsigned char* const pshdrs = sd->section_headers->data(); |
256 | ||
257 | this->find_symtab(pshdrs); | |
12e14209 | 258 | |
730cdc88 ILT |
259 | const unsigned char* namesu = sd->section_names->data(); |
260 | const char* names = reinterpret_cast<const char*>(namesu); | |
261 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) | |
262 | this->has_eh_frame_ = true; | |
263 | ||
75f2446e ILT |
264 | sd->symbols = NULL; |
265 | sd->symbols_size = 0; | |
730cdc88 | 266 | sd->external_symbols_offset = 0; |
75f2446e ILT |
267 | sd->symbol_names = NULL; |
268 | sd->symbol_names_size = 0; | |
269 | ||
645f8123 | 270 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
271 | { |
272 | // No symbol table. Weird but legal. | |
12e14209 | 273 | return; |
bae7f79e ILT |
274 | } |
275 | ||
12e14209 ILT |
276 | // Get the symbol table section header. |
277 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 278 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 279 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
bae7f79e | 280 | |
730cdc88 ILT |
281 | // If this object has a .eh_frame section, we need all the symbols. |
282 | // Otherwise we only need the external symbols. While it would be | |
283 | // simpler to just always read all the symbols, I've seen object | |
284 | // files with well over 2000 local symbols, which for a 64-bit | |
285 | // object file format is over 5 pages that we don't need to read | |
286 | // now. | |
287 | ||
75f65a3e | 288 | const int sym_size = This::sym_size; |
92e059d8 ILT |
289 | const unsigned int loccount = symtabshdr.get_sh_info(); |
290 | this->local_symbol_count_ = loccount; | |
291 | off_t locsize = loccount * sym_size; | |
730cdc88 ILT |
292 | off_t dataoff = symtabshdr.get_sh_offset(); |
293 | off_t datasize = symtabshdr.get_sh_size(); | |
294 | off_t extoff = dataoff + locsize; | |
295 | off_t extsize = datasize - locsize; | |
75f65a3e | 296 | |
730cdc88 ILT |
297 | off_t readoff = this->has_eh_frame_ ? dataoff : extoff; |
298 | off_t readsize = this->has_eh_frame_ ? datasize : extsize; | |
299 | ||
300 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, false); | |
bae7f79e ILT |
301 | |
302 | // Read the section header for the symbol names. | |
dbe717ef ILT |
303 | unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
304 | if (strtab_shndx >= this->shnum()) | |
bae7f79e | 305 | { |
75f2446e ILT |
306 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
307 | return; | |
bae7f79e | 308 | } |
dbe717ef | 309 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
310 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
311 | { | |
75f2446e ILT |
312 | this->error(_("symbol table name section has wrong type: %u"), |
313 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
314 | return; | |
bae7f79e ILT |
315 | } |
316 | ||
317 | // Read the symbol names. | |
318 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
9eb9fa57 | 319 | strtabshdr.get_sh_size(), true); |
bae7f79e | 320 | |
12e14209 | 321 | sd->symbols = fvsymtab; |
730cdc88 ILT |
322 | sd->symbols_size = readsize; |
323 | sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0; | |
12e14209 ILT |
324 | sd->symbol_names = fvstrtab; |
325 | sd->symbol_names_size = strtabshdr.get_sh_size(); | |
a2fb1b05 ILT |
326 | } |
327 | ||
730cdc88 ILT |
328 | // Return the section index of symbol SYM. Set *VALUE to its value in |
329 | // the object file. Note that for a symbol which is not defined in | |
330 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
331 | // it will not return the final value of the symbol in the link. | |
332 | ||
333 | template<int size, bool big_endian> | |
334 | unsigned int | |
335 | Sized_relobj<size, big_endian>::symbol_section_and_value(unsigned int sym, | |
336 | Address* value) | |
337 | { | |
338 | off_t symbols_size; | |
339 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, | |
340 | &symbols_size, | |
341 | false); | |
342 | ||
343 | const size_t count = symbols_size / This::sym_size; | |
344 | gold_assert(sym < count); | |
345 | ||
346 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); | |
347 | *value = elfsym.get_st_value(); | |
348 | // FIXME: Handle SHN_XINDEX. | |
349 | return elfsym.get_st_shndx(); | |
350 | } | |
351 | ||
a2fb1b05 ILT |
352 | // Return whether to include a section group in the link. LAYOUT is |
353 | // used to keep track of which section groups we have already seen. | |
354 | // INDEX is the index of the section group and SHDR is the section | |
355 | // header. If we do not want to include this group, we set bits in | |
356 | // OMIT for each section which should be discarded. | |
357 | ||
358 | template<int size, bool big_endian> | |
359 | bool | |
f6ce93d6 | 360 | Sized_relobj<size, big_endian>::include_section_group( |
a2fb1b05 ILT |
361 | Layout* layout, |
362 | unsigned int index, | |
363 | const elfcpp::Shdr<size, big_endian>& shdr, | |
364 | std::vector<bool>* omit) | |
365 | { | |
366 | // Read the section contents. | |
367 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
9eb9fa57 | 368 | shdr.get_sh_size(), false); |
a2fb1b05 ILT |
369 | const elfcpp::Elf_Word* pword = |
370 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
371 | ||
372 | // The first word contains flags. We only care about COMDAT section | |
373 | // groups. Other section groups are always included in the link | |
374 | // just like ordinary sections. | |
f6ce93d6 | 375 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 ILT |
376 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
377 | return true; | |
378 | ||
379 | // Look up the group signature, which is the name of a symbol. This | |
380 | // is a lot of effort to go to to read a string. Why didn't they | |
381 | // just use the name of the SHT_GROUP section as the group | |
382 | // signature? | |
383 | ||
384 | // Get the appropriate symbol table header (this will normally be | |
385 | // the single SHT_SYMTAB section, but in principle it need not be). | |
645f8123 ILT |
386 | const unsigned int link = shdr.get_sh_link(); |
387 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); | |
a2fb1b05 ILT |
388 | |
389 | // Read the symbol table entry. | |
390 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
391 | { | |
75f2446e ILT |
392 | this->error(_("section group %u info %u out of range"), |
393 | index, shdr.get_sh_info()); | |
394 | return false; | |
a2fb1b05 ILT |
395 | } |
396 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
9eb9fa57 | 397 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true); |
a2fb1b05 ILT |
398 | elfcpp::Sym<size, big_endian> sym(psym); |
399 | ||
a2fb1b05 | 400 | // Read the symbol table names. |
645f8123 ILT |
401 | off_t symnamelen; |
402 | const unsigned char* psymnamesu; | |
9eb9fa57 ILT |
403 | psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen, |
404 | true); | |
a2fb1b05 ILT |
405 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
406 | ||
407 | // Get the section group signature. | |
645f8123 | 408 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 | 409 | { |
75f2446e ILT |
410 | this->error(_("symbol %u name offset %u out of range"), |
411 | shdr.get_sh_info(), sym.get_st_name()); | |
412 | return false; | |
a2fb1b05 ILT |
413 | } |
414 | ||
415 | const char* signature = psymnames + sym.get_st_name(); | |
416 | ||
ead1e424 ILT |
417 | // It seems that some versions of gas will create a section group |
418 | // associated with a section symbol, and then fail to give a name to | |
419 | // the section symbol. In such a case, use the name of the section. | |
420 | // FIXME. | |
645f8123 ILT |
421 | std::string secname; |
422 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) | |
ead1e424 | 423 | { |
645f8123 ILT |
424 | secname = this->section_name(sym.get_st_shndx()); |
425 | signature = secname.c_str(); | |
ead1e424 ILT |
426 | } |
427 | ||
a2fb1b05 ILT |
428 | // Record this section group, and see whether we've already seen one |
429 | // with the same signature. | |
430 | if (layout->add_comdat(signature, true)) | |
431 | return true; | |
432 | ||
433 | // This is a duplicate. We want to discard the sections in this | |
434 | // group. | |
435 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
436 | for (size_t i = 1; i < count; ++i) | |
437 | { | |
f6ce93d6 ILT |
438 | elfcpp::Elf_Word secnum = |
439 | elfcpp::Swap<32, big_endian>::readval(pword + i); | |
a2fb1b05 ILT |
440 | if (secnum >= this->shnum()) |
441 | { | |
75f2446e ILT |
442 | this->error(_("section %u in section group %u out of range"), |
443 | secnum, index); | |
444 | continue; | |
a2fb1b05 ILT |
445 | } |
446 | (*omit)[secnum] = true; | |
447 | } | |
448 | ||
449 | return false; | |
450 | } | |
451 | ||
452 | // Whether to include a linkonce section in the link. NAME is the | |
453 | // name of the section and SHDR is the section header. | |
454 | ||
455 | // Linkonce sections are a GNU extension implemented in the original | |
456 | // GNU linker before section groups were defined. The semantics are | |
457 | // that we only include one linkonce section with a given name. The | |
458 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
459 | // where T is the type of section and SYMNAME is the name of a symbol. | |
460 | // In an attempt to make linkonce sections interact well with section | |
461 | // groups, we try to identify SYMNAME and use it like a section group | |
462 | // signature. We want to block section groups with that signature, | |
463 | // but not other linkonce sections with that signature. We also use | |
464 | // the full name of the linkonce section as a normal section group | |
465 | // signature. | |
466 | ||
467 | template<int size, bool big_endian> | |
468 | bool | |
f6ce93d6 | 469 | Sized_relobj<size, big_endian>::include_linkonce_section( |
a2fb1b05 ILT |
470 | Layout* layout, |
471 | const char* name, | |
472 | const elfcpp::Shdr<size, big_endian>&) | |
473 | { | |
ad435a24 ILT |
474 | // In general the symbol name we want will be the string following |
475 | // the last '.'. However, we have to handle the case of | |
476 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by | |
477 | // some versions of gcc. So we use a heuristic: if the name starts | |
478 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise | |
479 | // we look for the last '.'. We can't always simply skip | |
480 | // ".gnu.linkonce.X", because we have to deal with cases like | |
481 | // ".gnu.linkonce.d.rel.ro.local". | |
482 | const char* const linkonce_t = ".gnu.linkonce.t."; | |
483 | const char* symname; | |
484 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) | |
485 | symname = name + strlen(linkonce_t); | |
486 | else | |
487 | symname = strrchr(name, '.') + 1; | |
a783673b ILT |
488 | bool include1 = layout->add_comdat(symname, false); |
489 | bool include2 = layout->add_comdat(name, true); | |
490 | return include1 && include2; | |
a2fb1b05 ILT |
491 | } |
492 | ||
493 | // Lay out the input sections. We walk through the sections and check | |
494 | // whether they should be included in the link. If they should, we | |
495 | // pass them to the Layout object, which will return an output section | |
496 | // and an offset. | |
497 | ||
498 | template<int size, bool big_endian> | |
499 | void | |
7e1edb90 | 500 | Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab, |
f6ce93d6 | 501 | Layout* layout, |
12e14209 | 502 | Read_symbols_data* sd) |
a2fb1b05 | 503 | { |
dbe717ef | 504 | const unsigned int shnum = this->shnum(); |
12e14209 ILT |
505 | if (shnum == 0) |
506 | return; | |
a2fb1b05 ILT |
507 | |
508 | // Get the section headers. | |
12e14209 | 509 | const unsigned char* pshdrs = sd->section_headers->data(); |
a2fb1b05 ILT |
510 | |
511 | // Get the section names. | |
12e14209 | 512 | const unsigned char* pnamesu = sd->section_names->data(); |
a2fb1b05 ILT |
513 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
514 | ||
730cdc88 ILT |
515 | // For each section, record the index of the reloc section if any. |
516 | // Use 0 to mean that there is no reloc section, -1U to mean that | |
517 | // there is more than one. | |
518 | std::vector<unsigned int> reloc_shndx(shnum, 0); | |
519 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); | |
520 | // Skip the first, dummy, section. | |
521 | pshdrs += This::shdr_size; | |
522 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) | |
523 | { | |
524 | typename This::Shdr shdr(pshdrs); | |
525 | ||
526 | unsigned int sh_type = shdr.get_sh_type(); | |
527 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) | |
528 | { | |
529 | unsigned int target_shndx = shdr.get_sh_info(); | |
530 | if (target_shndx == 0 || target_shndx >= shnum) | |
531 | { | |
532 | this->error(_("relocation section %u has bad info %u"), | |
533 | i, target_shndx); | |
534 | continue; | |
535 | } | |
536 | ||
537 | if (reloc_shndx[target_shndx] != 0) | |
538 | reloc_shndx[target_shndx] = -1U; | |
539 | else | |
540 | { | |
541 | reloc_shndx[target_shndx] = i; | |
542 | reloc_type[target_shndx] = sh_type; | |
543 | } | |
544 | } | |
545 | } | |
546 | ||
a2fb1b05 | 547 | std::vector<Map_to_output>& map_sections(this->map_to_output()); |
61ba1cf9 | 548 | map_sections.resize(shnum); |
a2fb1b05 | 549 | |
35cdfc9a ILT |
550 | // Whether we've seen a .note.GNU-stack section. |
551 | bool seen_gnu_stack = false; | |
552 | // The flags of a .note.GNU-stack section. | |
553 | uint64_t gnu_stack_flags = 0; | |
554 | ||
a2fb1b05 ILT |
555 | // Keep track of which sections to omit. |
556 | std::vector<bool> omit(shnum, false); | |
557 | ||
730cdc88 ILT |
558 | // Keep track of .eh_frame sections. |
559 | std::vector<unsigned int> eh_frame_sections; | |
560 | ||
f6ce93d6 | 561 | // Skip the first, dummy, section. |
730cdc88 | 562 | pshdrs = sd->section_headers->data() + This::shdr_size; |
f6ce93d6 | 563 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 564 | { |
75f65a3e | 565 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 566 | |
12e14209 | 567 | if (shdr.get_sh_name() >= sd->section_names_size) |
a2fb1b05 | 568 | { |
75f2446e ILT |
569 | this->error(_("bad section name offset for section %u: %lu"), |
570 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
571 | return; | |
a2fb1b05 ILT |
572 | } |
573 | ||
574 | const char* name = pnames + shdr.get_sh_name(); | |
575 | ||
dbe717ef | 576 | if (this->handle_gnu_warning_section(name, i, symtab)) |
f6ce93d6 | 577 | { |
7e1edb90 | 578 | if (!parameters->output_is_object()) |
f6ce93d6 ILT |
579 | omit[i] = true; |
580 | } | |
581 | ||
35cdfc9a ILT |
582 | // The .note.GNU-stack section is special. It gives the |
583 | // protection flags that this object file requires for the stack | |
584 | // in memory. | |
585 | if (strcmp(name, ".note.GNU-stack") == 0) | |
586 | { | |
587 | seen_gnu_stack = true; | |
588 | gnu_stack_flags |= shdr.get_sh_flags(); | |
589 | omit[i] = true; | |
590 | } | |
591 | ||
a2fb1b05 ILT |
592 | bool discard = omit[i]; |
593 | if (!discard) | |
594 | { | |
595 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
596 | { | |
597 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
598 | discard = true; | |
599 | } | |
cba134d6 ILT |
600 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 |
601 | && Layout::is_linkonce(name)) | |
a2fb1b05 ILT |
602 | { |
603 | if (!this->include_linkonce_section(layout, name, shdr)) | |
604 | discard = true; | |
605 | } | |
606 | } | |
607 | ||
608 | if (discard) | |
609 | { | |
610 | // Do not include this section in the link. | |
611 | map_sections[i].output_section = NULL; | |
612 | continue; | |
613 | } | |
614 | ||
730cdc88 ILT |
615 | // The .eh_frame section is special. It holds exception frame |
616 | // information that we need to read in order to generate the | |
617 | // exception frame header. We process these after all the other | |
618 | // sections so that the exception frame reader can reliably | |
619 | // determine which sections are being discarded, and discard the | |
620 | // corresponding information. | |
621 | if (!parameters->output_is_object() | |
622 | && strcmp(name, ".eh_frame") == 0 | |
623 | && this->check_eh_frame_flags(&shdr)) | |
624 | { | |
625 | eh_frame_sections.push_back(i); | |
626 | continue; | |
627 | } | |
628 | ||
a2fb1b05 | 629 | off_t offset; |
730cdc88 ILT |
630 | Output_section* os = layout->layout(this, i, name, shdr, |
631 | reloc_shndx[i], reloc_type[i], | |
632 | &offset); | |
a2fb1b05 ILT |
633 | |
634 | map_sections[i].output_section = os; | |
635 | map_sections[i].offset = offset; | |
730cdc88 ILT |
636 | |
637 | // If this section requires special handling, and if there are | |
638 | // relocs that apply to it, then we must do the special handling | |
639 | // before we apply the relocs. | |
640 | if (offset == -1 && reloc_shndx[i] != 0) | |
641 | this->set_relocs_must_follow_section_writes(); | |
12e14209 ILT |
642 | } |
643 | ||
35cdfc9a ILT |
644 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags); |
645 | ||
730cdc88 ILT |
646 | // Handle the .eh_frame sections at the end. |
647 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); | |
648 | p != eh_frame_sections.end(); | |
649 | ++p) | |
650 | { | |
651 | gold_assert(this->has_eh_frame_); | |
652 | gold_assert(sd->external_symbols_offset != 0); | |
653 | ||
654 | unsigned int i = *p; | |
655 | const unsigned char *pshdr; | |
656 | pshdr = sd->section_headers->data() + i * This::shdr_size; | |
657 | typename This::Shdr shdr(pshdr); | |
658 | ||
659 | off_t offset; | |
660 | Output_section* os = layout->layout_eh_frame(this, | |
661 | sd->symbols->data(), | |
662 | sd->symbols_size, | |
663 | sd->symbol_names->data(), | |
664 | sd->symbol_names_size, | |
665 | i, shdr, | |
666 | reloc_shndx[i], | |
667 | reloc_type[i], | |
668 | &offset); | |
669 | map_sections[i].output_section = os; | |
670 | map_sections[i].offset = offset; | |
671 | ||
672 | // If this section requires special handling, and if there are | |
673 | // relocs that apply to it, then we must do the special handling | |
674 | // before we apply the relocs. | |
675 | if (offset == -1 && reloc_shndx[i] != 0) | |
676 | this->set_relocs_must_follow_section_writes(); | |
677 | } | |
678 | ||
12e14209 ILT |
679 | delete sd->section_headers; |
680 | sd->section_headers = NULL; | |
681 | delete sd->section_names; | |
682 | sd->section_names = NULL; | |
683 | } | |
684 | ||
685 | // Add the symbols to the symbol table. | |
686 | ||
687 | template<int size, bool big_endian> | |
688 | void | |
f6ce93d6 | 689 | Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
12e14209 ILT |
690 | Read_symbols_data* sd) |
691 | { | |
692 | if (sd->symbols == NULL) | |
693 | { | |
a3ad94ed | 694 | gold_assert(sd->symbol_names == NULL); |
12e14209 ILT |
695 | return; |
696 | } | |
a2fb1b05 | 697 | |
12e14209 | 698 | const int sym_size = This::sym_size; |
730cdc88 ILT |
699 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
700 | / sym_size); | |
701 | if (static_cast<off_t>(symcount * sym_size) | |
702 | != sd->symbols_size - sd->external_symbols_offset) | |
12e14209 | 703 | { |
75f2446e ILT |
704 | this->error(_("size of symbols is not multiple of symbol size")); |
705 | return; | |
a2fb1b05 | 706 | } |
12e14209 | 707 | |
730cdc88 | 708 | this->symbols_.resize(symcount); |
12e14209 | 709 | |
12e14209 ILT |
710 | const char* sym_names = |
711 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
730cdc88 ILT |
712 | symtab->add_from_relobj(this, |
713 | sd->symbols->data() + sd->external_symbols_offset, | |
714 | symcount, sym_names, sd->symbol_names_size, | |
715 | &this->symbols_); | |
12e14209 ILT |
716 | |
717 | delete sd->symbols; | |
718 | sd->symbols = NULL; | |
719 | delete sd->symbol_names; | |
720 | sd->symbol_names = NULL; | |
bae7f79e ILT |
721 | } |
722 | ||
75f65a3e | 723 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 | 724 | // which they should be output, we add their names to *POOL, and we |
b8e6aad9 ILT |
725 | // add their values to THIS->LOCAL_VALUES_. Return the symbol index. |
726 | // This function is always called from the main thread. The actual | |
727 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
728 | |
729 | template<int size, bool big_endian> | |
c06b7b0b ILT |
730 | unsigned int |
731 | Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index, | |
732 | off_t off, | |
75f65a3e ILT |
733 | Stringpool* pool) |
734 | { | |
a3ad94ed | 735 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 736 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
737 | { |
738 | // This object has no symbols. Weird but legal. | |
c06b7b0b | 739 | return index; |
61ba1cf9 ILT |
740 | } |
741 | ||
a3ad94ed | 742 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
61ba1cf9 | 743 | |
75f65a3e ILT |
744 | this->local_symbol_offset_ = off; |
745 | ||
746 | // Read the symbol table section header. | |
645f8123 ILT |
747 | const unsigned int symtab_shndx = this->symtab_shndx_; |
748 | typename This::Shdr symtabshdr(this, | |
749 | this->elf_file_.section_header(symtab_shndx)); | |
a3ad94ed | 750 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
75f65a3e ILT |
751 | |
752 | // Read the local symbols. | |
75f65a3e | 753 | const int sym_size = This::sym_size; |
92e059d8 | 754 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 755 | gold_assert(loccount == symtabshdr.get_sh_info()); |
75f65a3e ILT |
756 | off_t locsize = loccount * sym_size; |
757 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
9eb9fa57 | 758 | locsize, true); |
75f65a3e | 759 | |
c06b7b0b | 760 | this->local_values_.resize(loccount); |
61ba1cf9 | 761 | |
75f65a3e | 762 | // Read the symbol names. |
645f8123 ILT |
763 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
764 | off_t strtab_size; | |
765 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
9eb9fa57 ILT |
766 | &strtab_size, |
767 | true); | |
75f65a3e ILT |
768 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
769 | ||
770 | // Loop over the local symbols. | |
771 | ||
c06b7b0b | 772 | const std::vector<Map_to_output>& mo(this->map_to_output()); |
75f65a3e | 773 | unsigned int shnum = this->shnum(); |
61ba1cf9 | 774 | unsigned int count = 0; |
75f65a3e ILT |
775 | // Skip the first, dummy, symbol. |
776 | psyms += sym_size; | |
61ba1cf9 | 777 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
778 | { |
779 | elfcpp::Sym<size, big_endian> sym(psyms); | |
780 | ||
b8e6aad9 ILT |
781 | Symbol_value<size>& lv(this->local_values_[i]); |
782 | ||
75f65a3e | 783 | unsigned int shndx = sym.get_st_shndx(); |
b8e6aad9 | 784 | lv.set_input_shndx(shndx); |
75f65a3e | 785 | |
063f12a8 ILT |
786 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
787 | lv.set_is_section_symbol(); | |
788 | ||
75f65a3e ILT |
789 | if (shndx >= elfcpp::SHN_LORESERVE) |
790 | { | |
61ba1cf9 | 791 | if (shndx == elfcpp::SHN_ABS) |
b8e6aad9 | 792 | lv.set_output_value(sym.get_st_value()); |
61ba1cf9 | 793 | else |
75f65a3e | 794 | { |
61ba1cf9 | 795 | // FIXME: Handle SHN_XINDEX. |
75f2446e ILT |
796 | this->error(_("unknown section index %u for local symbol %u"), |
797 | shndx, i); | |
798 | lv.set_output_value(0); | |
75f65a3e | 799 | } |
75f65a3e ILT |
800 | } |
801 | else | |
802 | { | |
803 | if (shndx >= shnum) | |
804 | { | |
75f2446e ILT |
805 | this->error(_("local symbol %u section index %u out of range"), |
806 | i, shndx); | |
807 | shndx = 0; | |
75f65a3e ILT |
808 | } |
809 | ||
b8e6aad9 ILT |
810 | Output_section* os = mo[shndx].output_section; |
811 | ||
812 | if (os == NULL) | |
61ba1cf9 | 813 | { |
b8e6aad9 ILT |
814 | lv.set_output_value(0); |
815 | lv.set_no_output_symtab_entry(); | |
61ba1cf9 ILT |
816 | continue; |
817 | } | |
818 | ||
b8e6aad9 ILT |
819 | if (mo[shndx].offset == -1) |
820 | lv.set_input_value(sym.get_st_value()); | |
821 | else | |
822 | lv.set_output_value(mo[shndx].output_section->address() | |
823 | + mo[shndx].offset | |
824 | + sym.get_st_value()); | |
75f65a3e ILT |
825 | } |
826 | ||
c06b7b0b ILT |
827 | // Decide whether this symbol should go into the output file. |
828 | ||
829 | if (sym.get_st_type() == elfcpp::STT_SECTION) | |
f6ce93d6 | 830 | { |
b8e6aad9 | 831 | lv.set_no_output_symtab_entry(); |
c06b7b0b ILT |
832 | continue; |
833 | } | |
645f8123 | 834 | |
c06b7b0b ILT |
835 | if (sym.get_st_name() >= strtab_size) |
836 | { | |
75f2446e ILT |
837 | this->error(_("local symbol %u section name out of range: %u >= %u"), |
838 | i, sym.get_st_name(), | |
839 | static_cast<unsigned int>(strtab_size)); | |
840 | lv.set_no_output_symtab_entry(); | |
841 | continue; | |
f6ce93d6 | 842 | } |
c06b7b0b ILT |
843 | |
844 | const char* name = pnames + sym.get_st_name(); | |
cfd73a4e | 845 | pool->add(name, true, NULL); |
b8e6aad9 | 846 | lv.set_output_symtab_index(index); |
c06b7b0b | 847 | ++index; |
c06b7b0b | 848 | ++count; |
75f65a3e ILT |
849 | } |
850 | ||
61ba1cf9 ILT |
851 | this->output_local_symbol_count_ = count; |
852 | ||
c06b7b0b | 853 | return index; |
75f65a3e ILT |
854 | } |
855 | ||
e727fa71 ILT |
856 | // Return the value of the local symbol symndx. |
857 | template<int size, bool big_endian> | |
858 | typename elfcpp::Elf_types<size>::Elf_Addr | |
859 | Sized_relobj<size, big_endian>::local_symbol_value(unsigned int symndx) const | |
860 | { | |
861 | gold_assert(symndx < this->local_symbol_count_); | |
862 | gold_assert(symndx < this->local_values_.size()); | |
863 | const Symbol_value<size>& lv(this->local_values_[symndx]); | |
864 | return lv.value(this, 0); | |
865 | } | |
866 | ||
b8e6aad9 | 867 | // Return the value of a local symbol defined in input section SHNDX, |
063f12a8 ILT |
868 | // with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL |
869 | // indicates whether the symbol is a section symbol. This handles | |
870 | // SHF_MERGE sections. | |
b8e6aad9 ILT |
871 | template<int size, bool big_endian> |
872 | typename elfcpp::Elf_types<size>::Elf_Addr | |
873 | Sized_relobj<size, big_endian>::local_value(unsigned int shndx, | |
874 | Address value, | |
063f12a8 | 875 | bool is_section_symbol, |
b8e6aad9 ILT |
876 | Address addend) const |
877 | { | |
878 | const std::vector<Map_to_output>& mo(this->map_to_output()); | |
879 | Output_section* os = mo[shndx].output_section; | |
880 | if (os == NULL) | |
881 | return addend; | |
882 | gold_assert(mo[shndx].offset == -1); | |
063f12a8 ILT |
883 | |
884 | // Do the mapping required by the output section. If this is not a | |
885 | // section symbol, then we want to map the symbol value, and then | |
886 | // include the addend. If this is a section symbol, then we need to | |
887 | // include the addend to figure out where in the section we are, | |
888 | // before we do the mapping. This will do the right thing provided | |
889 | // the assembler is careful to only convert a relocation in a merged | |
890 | // section to a section symbol if there is a zero addend. If the | |
891 | // assembler does not do this, then in general we can't know what to | |
892 | // do, because we can't distinguish the addend for the instruction | |
893 | // format from the addend for the section offset. | |
894 | ||
895 | if (is_section_symbol) | |
896 | return os->output_address(this, shndx, value + addend); | |
897 | else | |
898 | return addend + os->output_address(this, shndx, value); | |
b8e6aad9 ILT |
899 | } |
900 | ||
61ba1cf9 ILT |
901 | // Write out the local symbols. |
902 | ||
903 | template<int size, bool big_endian> | |
904 | void | |
f6ce93d6 | 905 | Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of, |
61ba1cf9 ILT |
906 | const Stringpool* sympool) |
907 | { | |
9e2dcb77 ILT |
908 | if (parameters->strip_all()) |
909 | return; | |
910 | ||
a3ad94ed | 911 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 912 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
913 | { |
914 | // This object has no symbols. Weird but legal. | |
915 | return; | |
916 | } | |
917 | ||
918 | // Read the symbol table section header. | |
645f8123 ILT |
919 | const unsigned int symtab_shndx = this->symtab_shndx_; |
920 | typename This::Shdr symtabshdr(this, | |
921 | this->elf_file_.section_header(symtab_shndx)); | |
a3ad94ed | 922 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 | 923 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 924 | gold_assert(loccount == symtabshdr.get_sh_info()); |
61ba1cf9 ILT |
925 | |
926 | // Read the local symbols. | |
927 | const int sym_size = This::sym_size; | |
92e059d8 | 928 | off_t locsize = loccount * sym_size; |
61ba1cf9 | 929 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
9eb9fa57 | 930 | locsize, false); |
61ba1cf9 | 931 | |
61ba1cf9 | 932 | // Read the symbol names. |
645f8123 ILT |
933 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
934 | off_t strtab_size; | |
935 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
9eb9fa57 ILT |
936 | &strtab_size, |
937 | true); | |
61ba1cf9 ILT |
938 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
939 | ||
940 | // Get a view into the output file. | |
941 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
942 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
943 | output_size); | |
944 | ||
c06b7b0b ILT |
945 | const std::vector<Map_to_output>& mo(this->map_to_output()); |
946 | ||
a3ad94ed | 947 | gold_assert(this->local_values_.size() == loccount); |
61ba1cf9 | 948 | |
61ba1cf9 | 949 | unsigned char* ov = oview; |
c06b7b0b | 950 | psyms += sym_size; |
92e059d8 | 951 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
61ba1cf9 ILT |
952 | { |
953 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 | 954 | |
b8e6aad9 | 955 | if (!this->local_values_[i].needs_output_symtab_entry()) |
f6ce93d6 | 956 | continue; |
61ba1cf9 ILT |
957 | |
958 | unsigned int st_shndx = isym.get_st_shndx(); | |
959 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
960 | { | |
a3ad94ed | 961 | gold_assert(st_shndx < mo.size()); |
61ba1cf9 ILT |
962 | if (mo[st_shndx].output_section == NULL) |
963 | continue; | |
ead1e424 | 964 | st_shndx = mo[st_shndx].output_section->out_shndx(); |
61ba1cf9 ILT |
965 | } |
966 | ||
f6ce93d6 ILT |
967 | elfcpp::Sym_write<size, big_endian> osym(ov); |
968 | ||
a3ad94ed | 969 | gold_assert(isym.get_st_name() < strtab_size); |
c06b7b0b ILT |
970 | const char* name = pnames + isym.get_st_name(); |
971 | osym.put_st_name(sympool->get_offset(name)); | |
b8e6aad9 | 972 | osym.put_st_value(this->local_values_[i].value(this, 0)); |
61ba1cf9 ILT |
973 | osym.put_st_size(isym.get_st_size()); |
974 | osym.put_st_info(isym.get_st_info()); | |
975 | osym.put_st_other(isym.get_st_other()); | |
976 | osym.put_st_shndx(st_shndx); | |
977 | ||
978 | ov += sym_size; | |
979 | } | |
980 | ||
a3ad94ed | 981 | gold_assert(ov - oview == output_size); |
61ba1cf9 ILT |
982 | |
983 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
984 | } | |
985 | ||
f7e2ee48 ILT |
986 | // Set *INFO to symbolic information about the offset OFFSET in the |
987 | // section SHNDX. Return true if we found something, false if we | |
988 | // found nothing. | |
989 | ||
990 | template<int size, bool big_endian> | |
991 | bool | |
992 | Sized_relobj<size, big_endian>::get_symbol_location_info( | |
993 | unsigned int shndx, | |
994 | off_t offset, | |
995 | Symbol_location_info* info) | |
996 | { | |
997 | if (this->symtab_shndx_ == 0) | |
998 | return false; | |
999 | ||
1000 | off_t symbols_size; | |
1001 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, | |
1002 | &symbols_size, | |
1003 | false); | |
1004 | ||
1005 | unsigned int symbol_names_shndx = this->section_link(this->symtab_shndx_); | |
1006 | off_t names_size; | |
1007 | const unsigned char* symbol_names_u = | |
1008 | this->section_contents(symbol_names_shndx, &names_size, false); | |
1009 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
1010 | ||
1011 | const int sym_size = This::sym_size; | |
1012 | const size_t count = symbols_size / sym_size; | |
1013 | ||
1014 | const unsigned char* p = symbols; | |
1015 | for (size_t i = 0; i < count; ++i, p += sym_size) | |
1016 | { | |
1017 | elfcpp::Sym<size, big_endian> sym(p); | |
1018 | ||
1019 | if (sym.get_st_type() == elfcpp::STT_FILE) | |
1020 | { | |
1021 | if (sym.get_st_name() >= names_size) | |
1022 | info->source_file = "(invalid)"; | |
1023 | else | |
1024 | info->source_file = symbol_names + sym.get_st_name(); | |
1025 | } | |
1026 | else if (sym.get_st_shndx() == shndx | |
1027 | && static_cast<off_t>(sym.get_st_value()) <= offset | |
1028 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) | |
5c2c6c95 | 1029 | > offset)) |
f7e2ee48 ILT |
1030 | { |
1031 | if (sym.get_st_name() > names_size) | |
1032 | info->enclosing_symbol_name = "(invalid)"; | |
1033 | else | |
1034 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); | |
1035 | return true; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | return false; | |
1040 | } | |
1041 | ||
54dc6425 ILT |
1042 | // Input_objects methods. |
1043 | ||
008db82e ILT |
1044 | // Add a regular relocatable object to the list. Return false if this |
1045 | // object should be ignored. | |
f6ce93d6 | 1046 | |
008db82e | 1047 | bool |
54dc6425 ILT |
1048 | Input_objects::add_object(Object* obj) |
1049 | { | |
019cdb1a ILT |
1050 | Target* target = obj->target(); |
1051 | if (this->target_ == NULL) | |
1052 | this->target_ = target; | |
1053 | else if (this->target_ != target) | |
1054 | { | |
1055 | gold_error(_("%s: incompatible target"), obj->name().c_str()); | |
1056 | return false; | |
1057 | } | |
1058 | ||
008db82e | 1059 | if (!obj->is_dynamic()) |
f6ce93d6 | 1060 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
008db82e ILT |
1061 | else |
1062 | { | |
1063 | // See if this is a duplicate SONAME. | |
1064 | Dynobj* dynobj = static_cast<Dynobj*>(obj); | |
1065 | ||
1066 | std::pair<Unordered_set<std::string>::iterator, bool> ins = | |
1067 | this->sonames_.insert(dynobj->soname()); | |
1068 | if (!ins.second) | |
1069 | { | |
1070 | // We have already seen a dynamic object with this soname. | |
1071 | return false; | |
1072 | } | |
1073 | ||
1074 | this->dynobj_list_.push_back(dynobj); | |
1075 | } | |
75f65a3e | 1076 | |
9025d29d ILT |
1077 | set_parameters_size_and_endianness(target->get_size(), |
1078 | target->is_big_endian()); | |
1079 | ||
008db82e | 1080 | return true; |
54dc6425 ILT |
1081 | } |
1082 | ||
e2827e5f ILT |
1083 | // For each dynamic object, record whether we've seen all of its |
1084 | // explicit dependencies. | |
1085 | ||
1086 | void | |
1087 | Input_objects::check_dynamic_dependencies() const | |
1088 | { | |
1089 | for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); | |
1090 | p != this->dynobj_list_.end(); | |
1091 | ++p) | |
1092 | { | |
1093 | const Dynobj::Needed& needed((*p)->needed()); | |
1094 | bool found_all = true; | |
1095 | for (Dynobj::Needed::const_iterator pneeded = needed.begin(); | |
1096 | pneeded != needed.end(); | |
1097 | ++pneeded) | |
1098 | { | |
1099 | if (this->sonames_.find(*pneeded) == this->sonames_.end()) | |
1100 | { | |
1101 | found_all = false; | |
1102 | break; | |
1103 | } | |
1104 | } | |
1105 | (*p)->set_has_unknown_needed_entries(!found_all); | |
1106 | } | |
1107 | } | |
1108 | ||
92e059d8 ILT |
1109 | // Relocate_info methods. |
1110 | ||
1111 | // Return a string describing the location of a relocation. This is | |
1112 | // only used in error messages. | |
1113 | ||
1114 | template<int size, bool big_endian> | |
1115 | std::string | |
f7e2ee48 | 1116 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
92e059d8 | 1117 | { |
5c2c6c95 ILT |
1118 | // See if we can get line-number information from debugging sections. |
1119 | std::string filename; | |
1120 | std::string file_and_lineno; // Better than filename-only, if available. | |
4c50553d | 1121 | |
a55ce7fe | 1122 | Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
24badc65 ILT |
1123 | // This will be "" if we failed to parse the debug info for any reason. |
1124 | file_and_lineno = line_info.addr2line(this->data_shndx, offset); | |
4c50553d | 1125 | |
92e059d8 | 1126 | std::string ret(this->object->name()); |
f7e2ee48 ILT |
1127 | ret += ':'; |
1128 | Symbol_location_info info; | |
1129 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) | |
1130 | { | |
1131 | ret += " in function "; | |
5c2c6c95 ILT |
1132 | // We could demangle this name before printing, but we don't |
1133 | // bother because gcc runs linker output through a demangle | |
1134 | // filter itself. The only advantage to demangling here is if | |
1135 | // someone might call ld directly, rather than via gcc. If we | |
1136 | // did want to demangle, cplus_demangle() is in libiberty. | |
f7e2ee48 ILT |
1137 | ret += info.enclosing_symbol_name; |
1138 | ret += ":"; | |
5c2c6c95 ILT |
1139 | filename = info.source_file; |
1140 | } | |
1141 | ||
1142 | if (!file_and_lineno.empty()) | |
1143 | ret += file_and_lineno; | |
1144 | else | |
1145 | { | |
1146 | if (!filename.empty()) | |
1147 | ret += filename; | |
1148 | ret += "("; | |
1149 | ret += this->object->section_name(this->data_shndx); | |
1150 | char buf[100]; | |
1151 | // Offsets into sections have to be positive. | |
1152 | snprintf(buf, sizeof(buf), "+0x%lx", static_cast<long>(offset)); | |
1153 | ret += buf; | |
1154 | ret += ")"; | |
f7e2ee48 | 1155 | } |
92e059d8 ILT |
1156 | return ret; |
1157 | } | |
1158 | ||
bae7f79e ILT |
1159 | } // End namespace gold. |
1160 | ||
1161 | namespace | |
1162 | { | |
1163 | ||
1164 | using namespace gold; | |
1165 | ||
1166 | // Read an ELF file with the header and return the appropriate | |
1167 | // instance of Object. | |
1168 | ||
1169 | template<int size, bool big_endian> | |
1170 | Object* | |
1171 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
1172 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
1173 | { | |
1174 | int et = ehdr.get_e_type(); | |
bae7f79e ILT |
1175 | if (et == elfcpp::ET_REL) |
1176 | { | |
f6ce93d6 ILT |
1177 | Sized_relobj<size, big_endian>* obj = |
1178 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
bae7f79e ILT |
1179 | obj->setup(ehdr); |
1180 | return obj; | |
1181 | } | |
dbe717ef ILT |
1182 | else if (et == elfcpp::ET_DYN) |
1183 | { | |
1184 | Sized_dynobj<size, big_endian>* obj = | |
1185 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
1186 | obj->setup(ehdr); | |
1187 | return obj; | |
1188 | } | |
bae7f79e ILT |
1189 | else |
1190 | { | |
75f2446e ILT |
1191 | gold_error(_("%s: unsupported ELF file type %d"), |
1192 | name.c_str(), et); | |
1193 | return NULL; | |
bae7f79e ILT |
1194 | } |
1195 | } | |
1196 | ||
1197 | } // End anonymous namespace. | |
1198 | ||
1199 | namespace gold | |
1200 | { | |
1201 | ||
1202 | // Read an ELF file and return the appropriate instance of Object. | |
1203 | ||
1204 | Object* | |
1205 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
1206 | const unsigned char* p, off_t bytes) | |
1207 | { | |
1208 | if (bytes < elfcpp::EI_NIDENT) | |
1209 | { | |
75f2446e ILT |
1210 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1211 | return NULL; | |
bae7f79e ILT |
1212 | } |
1213 | ||
1214 | int v = p[elfcpp::EI_VERSION]; | |
1215 | if (v != elfcpp::EV_CURRENT) | |
1216 | { | |
1217 | if (v == elfcpp::EV_NONE) | |
75f2446e | 1218 | gold_error(_("%s: invalid ELF version 0"), name.c_str()); |
bae7f79e | 1219 | else |
75f2446e ILT |
1220 | gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v); |
1221 | return NULL; | |
bae7f79e ILT |
1222 | } |
1223 | ||
1224 | int c = p[elfcpp::EI_CLASS]; | |
1225 | if (c == elfcpp::ELFCLASSNONE) | |
1226 | { | |
75f2446e ILT |
1227 | gold_error(_("%s: invalid ELF class 0"), name.c_str()); |
1228 | return NULL; | |
bae7f79e ILT |
1229 | } |
1230 | else if (c != elfcpp::ELFCLASS32 | |
1231 | && c != elfcpp::ELFCLASS64) | |
1232 | { | |
75f2446e ILT |
1233 | gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c); |
1234 | return NULL; | |
bae7f79e ILT |
1235 | } |
1236 | ||
1237 | int d = p[elfcpp::EI_DATA]; | |
1238 | if (d == elfcpp::ELFDATANONE) | |
1239 | { | |
75f2446e ILT |
1240 | gold_error(_("%s: invalid ELF data encoding"), name.c_str()); |
1241 | return NULL; | |
bae7f79e ILT |
1242 | } |
1243 | else if (d != elfcpp::ELFDATA2LSB | |
1244 | && d != elfcpp::ELFDATA2MSB) | |
1245 | { | |
75f2446e ILT |
1246 | gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d); |
1247 | return NULL; | |
bae7f79e ILT |
1248 | } |
1249 | ||
1250 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
1251 | ||
1252 | if (c == elfcpp::ELFCLASS32) | |
1253 | { | |
1254 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
1255 | { | |
75f2446e ILT |
1256 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1257 | return NULL; | |
bae7f79e ILT |
1258 | } |
1259 | if (big_endian) | |
1260 | { | |
193a53d9 | 1261 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e ILT |
1262 | elfcpp::Ehdr<32, true> ehdr(p); |
1263 | return make_elf_sized_object<32, true>(name, input_file, | |
1264 | offset, ehdr); | |
193a53d9 | 1265 | #else |
75f2446e ILT |
1266 | gold_error(_("%s: not configured to support " |
1267 | "32-bit big-endian object"), | |
1268 | name.c_str()); | |
1269 | return NULL; | |
193a53d9 | 1270 | #endif |
bae7f79e ILT |
1271 | } |
1272 | else | |
1273 | { | |
193a53d9 | 1274 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e ILT |
1275 | elfcpp::Ehdr<32, false> ehdr(p); |
1276 | return make_elf_sized_object<32, false>(name, input_file, | |
1277 | offset, ehdr); | |
193a53d9 | 1278 | #else |
75f2446e ILT |
1279 | gold_error(_("%s: not configured to support " |
1280 | "32-bit little-endian object"), | |
1281 | name.c_str()); | |
1282 | return NULL; | |
193a53d9 | 1283 | #endif |
bae7f79e ILT |
1284 | } |
1285 | } | |
1286 | else | |
1287 | { | |
1288 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
1289 | { | |
75f2446e ILT |
1290 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1291 | return NULL; | |
bae7f79e ILT |
1292 | } |
1293 | if (big_endian) | |
1294 | { | |
193a53d9 | 1295 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e ILT |
1296 | elfcpp::Ehdr<64, true> ehdr(p); |
1297 | return make_elf_sized_object<64, true>(name, input_file, | |
1298 | offset, ehdr); | |
193a53d9 | 1299 | #else |
75f2446e ILT |
1300 | gold_error(_("%s: not configured to support " |
1301 | "64-bit big-endian object"), | |
1302 | name.c_str()); | |
1303 | return NULL; | |
193a53d9 | 1304 | #endif |
bae7f79e ILT |
1305 | } |
1306 | else | |
1307 | { | |
193a53d9 | 1308 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e ILT |
1309 | elfcpp::Ehdr<64, false> ehdr(p); |
1310 | return make_elf_sized_object<64, false>(name, input_file, | |
1311 | offset, ehdr); | |
193a53d9 | 1312 | #else |
75f2446e ILT |
1313 | gold_error(_("%s: not configured to support " |
1314 | "64-bit little-endian object"), | |
1315 | name.c_str()); | |
1316 | return NULL; | |
193a53d9 | 1317 | #endif |
bae7f79e ILT |
1318 | } |
1319 | } | |
1320 | } | |
1321 | ||
1322 | // Instantiate the templates we need. We could use the configure | |
1323 | // script to restrict this to only the ones for implemented targets. | |
1324 | ||
193a53d9 | 1325 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e | 1326 | template |
f6ce93d6 | 1327 | class Sized_relobj<32, false>; |
193a53d9 | 1328 | #endif |
bae7f79e | 1329 | |
193a53d9 | 1330 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e | 1331 | template |
f6ce93d6 | 1332 | class Sized_relobj<32, true>; |
193a53d9 | 1333 | #endif |
bae7f79e | 1334 | |
193a53d9 | 1335 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e | 1336 | template |
f6ce93d6 | 1337 | class Sized_relobj<64, false>; |
193a53d9 | 1338 | #endif |
bae7f79e | 1339 | |
193a53d9 | 1340 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e | 1341 | template |
f6ce93d6 | 1342 | class Sized_relobj<64, true>; |
193a53d9 | 1343 | #endif |
bae7f79e | 1344 | |
193a53d9 | 1345 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1346 | template |
1347 | struct Relocate_info<32, false>; | |
193a53d9 | 1348 | #endif |
92e059d8 | 1349 | |
193a53d9 | 1350 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1351 | template |
1352 | struct Relocate_info<32, true>; | |
193a53d9 | 1353 | #endif |
92e059d8 | 1354 | |
193a53d9 | 1355 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1356 | template |
1357 | struct Relocate_info<64, false>; | |
193a53d9 | 1358 | #endif |
92e059d8 | 1359 | |
193a53d9 | 1360 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1361 | template |
1362 | struct Relocate_info<64, true>; | |
193a53d9 | 1363 | #endif |
92e059d8 | 1364 | |
bae7f79e | 1365 | } // End namespace gold. |