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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 ILT |
33 | #include "symtab.h" |
34 | #include "object.h" | |
35 | #include "dynobj.h" | |
bae7f79e ILT |
36 | |
37 | namespace gold | |
38 | { | |
39 | ||
645f8123 ILT |
40 | // Class Object. |
41 | ||
dbe717ef ILT |
42 | // Set the target based on fields in the ELF file header. |
43 | ||
44 | void | |
45 | Object::set_target(int machine, int size, bool big_endian, int osabi, | |
46 | int abiversion) | |
47 | { | |
48 | Target* target = select_target(machine, size, big_endian, osabi, abiversion); | |
49 | if (target == NULL) | |
75f2446e ILT |
50 | gold_fatal(_("%s: unsupported ELF machine number %d"), |
51 | this->name().c_str(), machine); | |
dbe717ef ILT |
52 | this->target_ = target; |
53 | } | |
54 | ||
75f2446e ILT |
55 | // Report an error for this object file. This is used by the |
56 | // elfcpp::Elf_file interface, and also called by the Object code | |
57 | // itself. | |
645f8123 ILT |
58 | |
59 | void | |
75f2446e | 60 | Object::error(const char* format, ...) const |
645f8123 ILT |
61 | { |
62 | va_list args; | |
645f8123 | 63 | va_start(args, format); |
75f2446e ILT |
64 | char* buf = NULL; |
65 | if (vasprintf(&buf, format, args) < 0) | |
66 | gold_nomem(); | |
645f8123 | 67 | va_end(args); |
75f2446e ILT |
68 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
69 | free(buf); | |
645f8123 ILT |
70 | } |
71 | ||
72 | // Return a view of the contents of a section. | |
73 | ||
74 | const unsigned char* | |
9eb9fa57 | 75 | Object::section_contents(unsigned int shndx, off_t* plen, bool cache) |
645f8123 ILT |
76 | { |
77 | Location loc(this->do_section_contents(shndx)); | |
78 | *plen = loc.data_size; | |
9eb9fa57 | 79 | return this->get_view(loc.file_offset, loc.data_size, cache); |
645f8123 ILT |
80 | } |
81 | ||
dbe717ef ILT |
82 | // Read the section data into SD. This is code common to Sized_relobj |
83 | // and Sized_dynobj, so we put it into Object. | |
84 | ||
85 | template<int size, bool big_endian> | |
86 | void | |
87 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
88 | Read_symbols_data* sd) | |
89 | { | |
90 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
91 | ||
92 | // Read the section headers. | |
93 | const off_t shoff = elf_file->shoff(); | |
94 | const unsigned int shnum = this->shnum(); | |
9eb9fa57 | 95 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, true); |
dbe717ef ILT |
96 | |
97 | // Read the section names. | |
98 | const unsigned char* pshdrs = sd->section_headers->data(); | |
99 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
100 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
101 | ||
102 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
75f2446e ILT |
103 | this->error(_("section name section has wrong type: %u"), |
104 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
dbe717ef ILT |
105 | |
106 | sd->section_names_size = shdrnames.get_sh_size(); | |
107 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), | |
9eb9fa57 | 108 | sd->section_names_size, false); |
dbe717ef ILT |
109 | } |
110 | ||
111 | // If NAME is the name of a special .gnu.warning section, arrange for | |
112 | // the warning to be issued. SHNDX is the section index. Return | |
113 | // whether it is a warning section. | |
114 | ||
115 | bool | |
116 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, | |
117 | Symbol_table* symtab) | |
118 | { | |
119 | const char warn_prefix[] = ".gnu.warning."; | |
120 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
121 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) | |
122 | { | |
123 | symtab->add_warning(name + warn_prefix_len, this, shndx); | |
124 | return true; | |
125 | } | |
126 | return false; | |
127 | } | |
128 | ||
f6ce93d6 | 129 | // Class Sized_relobj. |
bae7f79e ILT |
130 | |
131 | template<int size, bool big_endian> | |
f6ce93d6 | 132 | Sized_relobj<size, big_endian>::Sized_relobj( |
bae7f79e ILT |
133 | const std::string& name, |
134 | Input_file* input_file, | |
135 | off_t offset, | |
136 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
f6ce93d6 | 137 | : Relobj(name, input_file, offset), |
645f8123 | 138 | elf_file_(this, ehdr), |
dbe717ef | 139 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
140 | local_symbol_count_(0), |
141 | output_local_symbol_count_(0), | |
730cdc88 | 142 | symbols_(), |
61ba1cf9 | 143 | local_symbol_offset_(0), |
e727fa71 | 144 | local_values_(), |
730cdc88 ILT |
145 | local_got_offsets_(), |
146 | has_eh_frame_(false) | |
bae7f79e | 147 | { |
bae7f79e ILT |
148 | } |
149 | ||
150 | template<int size, bool big_endian> | |
f6ce93d6 | 151 | Sized_relobj<size, big_endian>::~Sized_relobj() |
bae7f79e ILT |
152 | { |
153 | } | |
154 | ||
645f8123 | 155 | // Set up an object file based on the file header. This sets up the |
bae7f79e ILT |
156 | // target and reads the section information. |
157 | ||
158 | template<int size, bool big_endian> | |
159 | void | |
f6ce93d6 | 160 | Sized_relobj<size, big_endian>::setup( |
bae7f79e ILT |
161 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
162 | { | |
dbe717ef ILT |
163 | this->set_target(ehdr.get_e_machine(), size, big_endian, |
164 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
165 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
12e14209 | 166 | |
dbe717ef | 167 | const unsigned int shnum = this->elf_file_.shnum(); |
a2fb1b05 | 168 | this->set_shnum(shnum); |
dbe717ef | 169 | } |
12e14209 | 170 | |
dbe717ef ILT |
171 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
172 | // standard says that maybe in the future there can be more than one | |
173 | // SHT_SYMTAB section. Until somebody figures out how that could | |
174 | // work, we assume there is only one. | |
12e14209 | 175 | |
dbe717ef ILT |
176 | template<int size, bool big_endian> |
177 | void | |
178 | Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) | |
179 | { | |
180 | const unsigned int shnum = this->shnum(); | |
181 | this->symtab_shndx_ = 0; | |
182 | if (shnum > 0) | |
bae7f79e | 183 | { |
dbe717ef ILT |
184 | // Look through the sections in reverse order, since gas tends |
185 | // to put the symbol table at the end. | |
186 | const unsigned char* p = pshdrs + shnum * This::shdr_size; | |
187 | unsigned int i = shnum; | |
188 | while (i > 0) | |
bae7f79e | 189 | { |
dbe717ef ILT |
190 | --i; |
191 | p -= This::shdr_size; | |
192 | typename This::Shdr shdr(p); | |
193 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
194 | { | |
195 | this->symtab_shndx_ = i; | |
196 | break; | |
197 | } | |
bae7f79e | 198 | } |
bae7f79e ILT |
199 | } |
200 | } | |
201 | ||
730cdc88 ILT |
202 | // Return whether SHDR has the right type and flags to be a GNU |
203 | // .eh_frame section. | |
204 | ||
205 | template<int size, bool big_endian> | |
206 | bool | |
207 | Sized_relobj<size, big_endian>::check_eh_frame_flags( | |
208 | const elfcpp::Shdr<size, big_endian>* shdr) const | |
209 | { | |
210 | return (shdr->get_sh_size() > 0 | |
211 | && shdr->get_sh_type() == elfcpp::SHT_PROGBITS | |
212 | && shdr->get_sh_flags() == elfcpp::SHF_ALLOC); | |
213 | } | |
214 | ||
215 | // Return whether there is a GNU .eh_frame section, given the section | |
216 | // headers and the section names. | |
217 | ||
218 | template<int size, bool big_endian> | |
219 | bool | |
220 | Sized_relobj<size, big_endian>::find_eh_frame(const unsigned char* pshdrs, | |
221 | const char* names, | |
222 | off_t names_size) const | |
223 | { | |
224 | const unsigned int shnum = this->shnum(); | |
225 | const unsigned char* p = pshdrs + This::shdr_size; | |
226 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
227 | { | |
228 | typename This::Shdr shdr(p); | |
229 | if (this->check_eh_frame_flags(&shdr)) | |
230 | { | |
231 | if (shdr.get_sh_name() >= names_size) | |
232 | { | |
233 | this->error(_("bad section name offset for section %u: %lu"), | |
234 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
235 | continue; | |
236 | } | |
237 | ||
238 | const char* name = names + shdr.get_sh_name(); | |
239 | if (strcmp(name, ".eh_frame") == 0) | |
240 | return true; | |
241 | } | |
242 | } | |
243 | return false; | |
244 | } | |
245 | ||
12e14209 | 246 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
247 | |
248 | template<int size, bool big_endian> | |
12e14209 | 249 | void |
f6ce93d6 | 250 | Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 251 | { |
dbe717ef | 252 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 253 | |
dbe717ef ILT |
254 | const unsigned char* const pshdrs = sd->section_headers->data(); |
255 | ||
256 | this->find_symtab(pshdrs); | |
12e14209 | 257 | |
730cdc88 ILT |
258 | const unsigned char* namesu = sd->section_names->data(); |
259 | const char* names = reinterpret_cast<const char*>(namesu); | |
260 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) | |
261 | this->has_eh_frame_ = true; | |
262 | ||
75f2446e ILT |
263 | sd->symbols = NULL; |
264 | sd->symbols_size = 0; | |
730cdc88 | 265 | sd->external_symbols_offset = 0; |
75f2446e ILT |
266 | sd->symbol_names = NULL; |
267 | sd->symbol_names_size = 0; | |
268 | ||
645f8123 | 269 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
270 | { |
271 | // No symbol table. Weird but legal. | |
12e14209 | 272 | return; |
bae7f79e ILT |
273 | } |
274 | ||
12e14209 ILT |
275 | // Get the symbol table section header. |
276 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 277 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 278 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
bae7f79e | 279 | |
730cdc88 ILT |
280 | // If this object has a .eh_frame section, we need all the symbols. |
281 | // Otherwise we only need the external symbols. While it would be | |
282 | // simpler to just always read all the symbols, I've seen object | |
283 | // files with well over 2000 local symbols, which for a 64-bit | |
284 | // object file format is over 5 pages that we don't need to read | |
285 | // now. | |
286 | ||
75f65a3e | 287 | const int sym_size = This::sym_size; |
92e059d8 ILT |
288 | const unsigned int loccount = symtabshdr.get_sh_info(); |
289 | this->local_symbol_count_ = loccount; | |
290 | off_t locsize = loccount * sym_size; | |
730cdc88 ILT |
291 | off_t dataoff = symtabshdr.get_sh_offset(); |
292 | off_t datasize = symtabshdr.get_sh_size(); | |
293 | off_t extoff = dataoff + locsize; | |
294 | off_t extsize = datasize - locsize; | |
75f65a3e | 295 | |
730cdc88 ILT |
296 | off_t readoff = this->has_eh_frame_ ? dataoff : extoff; |
297 | off_t readsize = this->has_eh_frame_ ? datasize : extsize; | |
298 | ||
299 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, false); | |
bae7f79e ILT |
300 | |
301 | // Read the section header for the symbol names. | |
dbe717ef ILT |
302 | unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
303 | if (strtab_shndx >= this->shnum()) | |
bae7f79e | 304 | { |
75f2446e ILT |
305 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
306 | return; | |
bae7f79e | 307 | } |
dbe717ef | 308 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
309 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
310 | { | |
75f2446e ILT |
311 | this->error(_("symbol table name section has wrong type: %u"), |
312 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
313 | return; | |
bae7f79e ILT |
314 | } |
315 | ||
316 | // Read the symbol names. | |
317 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
9eb9fa57 | 318 | strtabshdr.get_sh_size(), true); |
bae7f79e | 319 | |
12e14209 | 320 | sd->symbols = fvsymtab; |
730cdc88 ILT |
321 | sd->symbols_size = readsize; |
322 | sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0; | |
12e14209 ILT |
323 | sd->symbol_names = fvstrtab; |
324 | sd->symbol_names_size = strtabshdr.get_sh_size(); | |
a2fb1b05 ILT |
325 | } |
326 | ||
730cdc88 ILT |
327 | // Return the section index of symbol SYM. Set *VALUE to its value in |
328 | // the object file. Note that for a symbol which is not defined in | |
329 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
330 | // it will not return the final value of the symbol in the link. | |
331 | ||
332 | template<int size, bool big_endian> | |
333 | unsigned int | |
334 | Sized_relobj<size, big_endian>::symbol_section_and_value(unsigned int sym, | |
335 | Address* value) | |
336 | { | |
337 | off_t symbols_size; | |
338 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, | |
339 | &symbols_size, | |
340 | false); | |
341 | ||
342 | const size_t count = symbols_size / This::sym_size; | |
343 | gold_assert(sym < count); | |
344 | ||
345 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); | |
346 | *value = elfsym.get_st_value(); | |
347 | // FIXME: Handle SHN_XINDEX. | |
348 | return elfsym.get_st_shndx(); | |
349 | } | |
350 | ||
a2fb1b05 ILT |
351 | // Return whether to include a section group in the link. LAYOUT is |
352 | // used to keep track of which section groups we have already seen. | |
353 | // INDEX is the index of the section group and SHDR is the section | |
354 | // header. If we do not want to include this group, we set bits in | |
355 | // OMIT for each section which should be discarded. | |
356 | ||
357 | template<int size, bool big_endian> | |
358 | bool | |
f6ce93d6 | 359 | Sized_relobj<size, big_endian>::include_section_group( |
a2fb1b05 ILT |
360 | Layout* layout, |
361 | unsigned int index, | |
362 | const elfcpp::Shdr<size, big_endian>& shdr, | |
363 | std::vector<bool>* omit) | |
364 | { | |
365 | // Read the section contents. | |
366 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), | |
9eb9fa57 | 367 | shdr.get_sh_size(), false); |
a2fb1b05 ILT |
368 | const elfcpp::Elf_Word* pword = |
369 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
370 | ||
371 | // The first word contains flags. We only care about COMDAT section | |
372 | // groups. Other section groups are always included in the link | |
373 | // just like ordinary sections. | |
f6ce93d6 | 374 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 ILT |
375 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
376 | return true; | |
377 | ||
378 | // Look up the group signature, which is the name of a symbol. This | |
379 | // is a lot of effort to go to to read a string. Why didn't they | |
380 | // just use the name of the SHT_GROUP section as the group | |
381 | // signature? | |
382 | ||
383 | // Get the appropriate symbol table header (this will normally be | |
384 | // the single SHT_SYMTAB section, but in principle it need not be). | |
645f8123 ILT |
385 | const unsigned int link = shdr.get_sh_link(); |
386 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); | |
a2fb1b05 ILT |
387 | |
388 | // Read the symbol table entry. | |
389 | if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) | |
390 | { | |
75f2446e ILT |
391 | this->error(_("section group %u info %u out of range"), |
392 | index, shdr.get_sh_info()); | |
393 | return false; | |
a2fb1b05 ILT |
394 | } |
395 | off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; | |
9eb9fa57 | 396 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true); |
a2fb1b05 ILT |
397 | elfcpp::Sym<size, big_endian> sym(psym); |
398 | ||
a2fb1b05 | 399 | // Read the symbol table names. |
645f8123 ILT |
400 | off_t symnamelen; |
401 | const unsigned char* psymnamesu; | |
9eb9fa57 ILT |
402 | psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen, |
403 | true); | |
a2fb1b05 ILT |
404 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
405 | ||
406 | // Get the section group signature. | |
645f8123 | 407 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 | 408 | { |
75f2446e ILT |
409 | this->error(_("symbol %u name offset %u out of range"), |
410 | shdr.get_sh_info(), sym.get_st_name()); | |
411 | return false; | |
a2fb1b05 ILT |
412 | } |
413 | ||
414 | const char* signature = psymnames + sym.get_st_name(); | |
415 | ||
ead1e424 ILT |
416 | // It seems that some versions of gas will create a section group |
417 | // associated with a section symbol, and then fail to give a name to | |
418 | // the section symbol. In such a case, use the name of the section. | |
419 | // FIXME. | |
645f8123 ILT |
420 | std::string secname; |
421 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) | |
ead1e424 | 422 | { |
645f8123 ILT |
423 | secname = this->section_name(sym.get_st_shndx()); |
424 | signature = secname.c_str(); | |
ead1e424 ILT |
425 | } |
426 | ||
a2fb1b05 ILT |
427 | // Record this section group, and see whether we've already seen one |
428 | // with the same signature. | |
429 | if (layout->add_comdat(signature, true)) | |
430 | return true; | |
431 | ||
432 | // This is a duplicate. We want to discard the sections in this | |
433 | // group. | |
434 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); | |
435 | for (size_t i = 1; i < count; ++i) | |
436 | { | |
f6ce93d6 ILT |
437 | elfcpp::Elf_Word secnum = |
438 | elfcpp::Swap<32, big_endian>::readval(pword + i); | |
a2fb1b05 ILT |
439 | if (secnum >= this->shnum()) |
440 | { | |
75f2446e ILT |
441 | this->error(_("section %u in section group %u out of range"), |
442 | secnum, index); | |
443 | continue; | |
a2fb1b05 ILT |
444 | } |
445 | (*omit)[secnum] = true; | |
446 | } | |
447 | ||
448 | return false; | |
449 | } | |
450 | ||
451 | // Whether to include a linkonce section in the link. NAME is the | |
452 | // name of the section and SHDR is the section header. | |
453 | ||
454 | // Linkonce sections are a GNU extension implemented in the original | |
455 | // GNU linker before section groups were defined. The semantics are | |
456 | // that we only include one linkonce section with a given name. The | |
457 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
458 | // where T is the type of section and SYMNAME is the name of a symbol. | |
459 | // In an attempt to make linkonce sections interact well with section | |
460 | // groups, we try to identify SYMNAME and use it like a section group | |
461 | // signature. We want to block section groups with that signature, | |
462 | // but not other linkonce sections with that signature. We also use | |
463 | // the full name of the linkonce section as a normal section group | |
464 | // signature. | |
465 | ||
466 | template<int size, bool big_endian> | |
467 | bool | |
f6ce93d6 | 468 | Sized_relobj<size, big_endian>::include_linkonce_section( |
a2fb1b05 ILT |
469 | Layout* layout, |
470 | const char* name, | |
471 | const elfcpp::Shdr<size, big_endian>&) | |
472 | { | |
ad435a24 ILT |
473 | // In general the symbol name we want will be the string following |
474 | // the last '.'. However, we have to handle the case of | |
475 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by | |
476 | // some versions of gcc. So we use a heuristic: if the name starts | |
477 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise | |
478 | // we look for the last '.'. We can't always simply skip | |
479 | // ".gnu.linkonce.X", because we have to deal with cases like | |
480 | // ".gnu.linkonce.d.rel.ro.local". | |
481 | const char* const linkonce_t = ".gnu.linkonce.t."; | |
482 | const char* symname; | |
483 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) | |
484 | symname = name + strlen(linkonce_t); | |
485 | else | |
486 | symname = strrchr(name, '.') + 1; | |
a783673b ILT |
487 | bool include1 = layout->add_comdat(symname, false); |
488 | bool include2 = layout->add_comdat(name, true); | |
489 | return include1 && include2; | |
a2fb1b05 ILT |
490 | } |
491 | ||
492 | // Lay out the input sections. We walk through the sections and check | |
493 | // whether they should be included in the link. If they should, we | |
494 | // pass them to the Layout object, which will return an output section | |
495 | // and an offset. | |
496 | ||
497 | template<int size, bool big_endian> | |
498 | void | |
7e1edb90 | 499 | Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab, |
f6ce93d6 | 500 | Layout* layout, |
12e14209 | 501 | Read_symbols_data* sd) |
a2fb1b05 | 502 | { |
dbe717ef | 503 | const unsigned int shnum = this->shnum(); |
12e14209 ILT |
504 | if (shnum == 0) |
505 | return; | |
a2fb1b05 ILT |
506 | |
507 | // Get the section headers. | |
12e14209 | 508 | const unsigned char* pshdrs = sd->section_headers->data(); |
a2fb1b05 ILT |
509 | |
510 | // Get the section names. | |
12e14209 | 511 | const unsigned char* pnamesu = sd->section_names->data(); |
a2fb1b05 ILT |
512 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
513 | ||
730cdc88 ILT |
514 | // For each section, record the index of the reloc section if any. |
515 | // Use 0 to mean that there is no reloc section, -1U to mean that | |
516 | // there is more than one. | |
517 | std::vector<unsigned int> reloc_shndx(shnum, 0); | |
518 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); | |
519 | // Skip the first, dummy, section. | |
520 | pshdrs += This::shdr_size; | |
521 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) | |
522 | { | |
523 | typename This::Shdr shdr(pshdrs); | |
524 | ||
525 | unsigned int sh_type = shdr.get_sh_type(); | |
526 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) | |
527 | { | |
528 | unsigned int target_shndx = shdr.get_sh_info(); | |
529 | if (target_shndx == 0 || target_shndx >= shnum) | |
530 | { | |
531 | this->error(_("relocation section %u has bad info %u"), | |
532 | i, target_shndx); | |
533 | continue; | |
534 | } | |
535 | ||
536 | if (reloc_shndx[target_shndx] != 0) | |
537 | reloc_shndx[target_shndx] = -1U; | |
538 | else | |
539 | { | |
540 | reloc_shndx[target_shndx] = i; | |
541 | reloc_type[target_shndx] = sh_type; | |
542 | } | |
543 | } | |
544 | } | |
545 | ||
a2fb1b05 | 546 | std::vector<Map_to_output>& map_sections(this->map_to_output()); |
61ba1cf9 | 547 | map_sections.resize(shnum); |
a2fb1b05 | 548 | |
35cdfc9a ILT |
549 | // Whether we've seen a .note.GNU-stack section. |
550 | bool seen_gnu_stack = false; | |
551 | // The flags of a .note.GNU-stack section. | |
552 | uint64_t gnu_stack_flags = 0; | |
553 | ||
a2fb1b05 ILT |
554 | // Keep track of which sections to omit. |
555 | std::vector<bool> omit(shnum, false); | |
556 | ||
730cdc88 ILT |
557 | // Keep track of .eh_frame sections. |
558 | std::vector<unsigned int> eh_frame_sections; | |
559 | ||
f6ce93d6 | 560 | // Skip the first, dummy, section. |
730cdc88 | 561 | pshdrs = sd->section_headers->data() + This::shdr_size; |
f6ce93d6 | 562 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 563 | { |
75f65a3e | 564 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 565 | |
12e14209 | 566 | if (shdr.get_sh_name() >= sd->section_names_size) |
a2fb1b05 | 567 | { |
75f2446e ILT |
568 | this->error(_("bad section name offset for section %u: %lu"), |
569 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
570 | return; | |
a2fb1b05 ILT |
571 | } |
572 | ||
573 | const char* name = pnames + shdr.get_sh_name(); | |
574 | ||
dbe717ef | 575 | if (this->handle_gnu_warning_section(name, i, symtab)) |
f6ce93d6 | 576 | { |
7e1edb90 | 577 | if (!parameters->output_is_object()) |
f6ce93d6 ILT |
578 | omit[i] = true; |
579 | } | |
580 | ||
35cdfc9a ILT |
581 | // The .note.GNU-stack section is special. It gives the |
582 | // protection flags that this object file requires for the stack | |
583 | // in memory. | |
584 | if (strcmp(name, ".note.GNU-stack") == 0) | |
585 | { | |
586 | seen_gnu_stack = true; | |
587 | gnu_stack_flags |= shdr.get_sh_flags(); | |
588 | omit[i] = true; | |
589 | } | |
590 | ||
a2fb1b05 ILT |
591 | bool discard = omit[i]; |
592 | if (!discard) | |
593 | { | |
594 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
595 | { | |
596 | if (!this->include_section_group(layout, i, shdr, &omit)) | |
597 | discard = true; | |
598 | } | |
cba134d6 ILT |
599 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 |
600 | && Layout::is_linkonce(name)) | |
a2fb1b05 ILT |
601 | { |
602 | if (!this->include_linkonce_section(layout, name, shdr)) | |
603 | discard = true; | |
604 | } | |
605 | } | |
606 | ||
607 | if (discard) | |
608 | { | |
609 | // Do not include this section in the link. | |
610 | map_sections[i].output_section = NULL; | |
611 | continue; | |
612 | } | |
613 | ||
730cdc88 ILT |
614 | // The .eh_frame section is special. It holds exception frame |
615 | // information that we need to read in order to generate the | |
616 | // exception frame header. We process these after all the other | |
617 | // sections so that the exception frame reader can reliably | |
618 | // determine which sections are being discarded, and discard the | |
619 | // corresponding information. | |
620 | if (!parameters->output_is_object() | |
621 | && strcmp(name, ".eh_frame") == 0 | |
622 | && this->check_eh_frame_flags(&shdr)) | |
623 | { | |
624 | eh_frame_sections.push_back(i); | |
625 | continue; | |
626 | } | |
627 | ||
a2fb1b05 | 628 | off_t offset; |
730cdc88 ILT |
629 | Output_section* os = layout->layout(this, i, name, shdr, |
630 | reloc_shndx[i], reloc_type[i], | |
631 | &offset); | |
a2fb1b05 ILT |
632 | |
633 | map_sections[i].output_section = os; | |
634 | map_sections[i].offset = offset; | |
730cdc88 ILT |
635 | |
636 | // If this section requires special handling, and if there are | |
637 | // relocs that apply to it, then we must do the special handling | |
638 | // before we apply the relocs. | |
639 | if (offset == -1 && reloc_shndx[i] != 0) | |
640 | this->set_relocs_must_follow_section_writes(); | |
12e14209 ILT |
641 | } |
642 | ||
35cdfc9a ILT |
643 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags); |
644 | ||
730cdc88 ILT |
645 | // Handle the .eh_frame sections at the end. |
646 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); | |
647 | p != eh_frame_sections.end(); | |
648 | ++p) | |
649 | { | |
650 | gold_assert(this->has_eh_frame_); | |
651 | gold_assert(sd->external_symbols_offset != 0); | |
652 | ||
653 | unsigned int i = *p; | |
654 | const unsigned char *pshdr; | |
655 | pshdr = sd->section_headers->data() + i * This::shdr_size; | |
656 | typename This::Shdr shdr(pshdr); | |
657 | ||
658 | off_t offset; | |
659 | Output_section* os = layout->layout_eh_frame(this, | |
660 | sd->symbols->data(), | |
661 | sd->symbols_size, | |
662 | sd->symbol_names->data(), | |
663 | sd->symbol_names_size, | |
664 | i, shdr, | |
665 | reloc_shndx[i], | |
666 | reloc_type[i], | |
667 | &offset); | |
668 | map_sections[i].output_section = os; | |
669 | map_sections[i].offset = offset; | |
670 | ||
671 | // If this section requires special handling, and if there are | |
672 | // relocs that apply to it, then we must do the special handling | |
673 | // before we apply the relocs. | |
674 | if (offset == -1 && reloc_shndx[i] != 0) | |
675 | this->set_relocs_must_follow_section_writes(); | |
676 | } | |
677 | ||
12e14209 ILT |
678 | delete sd->section_headers; |
679 | sd->section_headers = NULL; | |
680 | delete sd->section_names; | |
681 | sd->section_names = NULL; | |
682 | } | |
683 | ||
684 | // Add the symbols to the symbol table. | |
685 | ||
686 | template<int size, bool big_endian> | |
687 | void | |
f6ce93d6 | 688 | Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
12e14209 ILT |
689 | Read_symbols_data* sd) |
690 | { | |
691 | if (sd->symbols == NULL) | |
692 | { | |
a3ad94ed | 693 | gold_assert(sd->symbol_names == NULL); |
12e14209 ILT |
694 | return; |
695 | } | |
a2fb1b05 | 696 | |
12e14209 | 697 | const int sym_size = This::sym_size; |
730cdc88 ILT |
698 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
699 | / sym_size); | |
700 | if (static_cast<off_t>(symcount * sym_size) | |
701 | != sd->symbols_size - sd->external_symbols_offset) | |
12e14209 | 702 | { |
75f2446e ILT |
703 | this->error(_("size of symbols is not multiple of symbol size")); |
704 | return; | |
a2fb1b05 | 705 | } |
12e14209 | 706 | |
730cdc88 | 707 | this->symbols_.resize(symcount); |
12e14209 | 708 | |
12e14209 ILT |
709 | const char* sym_names = |
710 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
730cdc88 ILT |
711 | symtab->add_from_relobj(this, |
712 | sd->symbols->data() + sd->external_symbols_offset, | |
713 | symcount, sym_names, sd->symbol_names_size, | |
714 | &this->symbols_); | |
12e14209 ILT |
715 | |
716 | delete sd->symbols; | |
717 | sd->symbols = NULL; | |
718 | delete sd->symbol_names; | |
719 | sd->symbol_names = NULL; | |
bae7f79e ILT |
720 | } |
721 | ||
75f65a3e | 722 | // Finalize the local symbols. Here we record the file offset at |
61ba1cf9 | 723 | // which they should be output, we add their names to *POOL, and we |
b8e6aad9 ILT |
724 | // add their values to THIS->LOCAL_VALUES_. Return the symbol index. |
725 | // This function is always called from the main thread. The actual | |
726 | // output of the local symbols will occur in a separate task. | |
75f65a3e ILT |
727 | |
728 | template<int size, bool big_endian> | |
c06b7b0b ILT |
729 | unsigned int |
730 | Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index, | |
731 | off_t off, | |
75f65a3e ILT |
732 | Stringpool* pool) |
733 | { | |
a3ad94ed | 734 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 735 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
736 | { |
737 | // This object has no symbols. Weird but legal. | |
c06b7b0b | 738 | return index; |
61ba1cf9 ILT |
739 | } |
740 | ||
a3ad94ed | 741 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
61ba1cf9 | 742 | |
75f65a3e ILT |
743 | this->local_symbol_offset_ = off; |
744 | ||
745 | // Read the symbol table section header. | |
645f8123 ILT |
746 | const unsigned int symtab_shndx = this->symtab_shndx_; |
747 | typename This::Shdr symtabshdr(this, | |
748 | this->elf_file_.section_header(symtab_shndx)); | |
a3ad94ed | 749 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
75f65a3e ILT |
750 | |
751 | // Read the local symbols. | |
75f65a3e | 752 | const int sym_size = This::sym_size; |
92e059d8 | 753 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 754 | gold_assert(loccount == symtabshdr.get_sh_info()); |
75f65a3e ILT |
755 | off_t locsize = loccount * sym_size; |
756 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
9eb9fa57 | 757 | locsize, true); |
75f65a3e | 758 | |
c06b7b0b | 759 | this->local_values_.resize(loccount); |
61ba1cf9 | 760 | |
75f65a3e | 761 | // Read the symbol names. |
645f8123 ILT |
762 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
763 | off_t strtab_size; | |
764 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
9eb9fa57 ILT |
765 | &strtab_size, |
766 | true); | |
75f65a3e ILT |
767 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
768 | ||
769 | // Loop over the local symbols. | |
770 | ||
c06b7b0b | 771 | const std::vector<Map_to_output>& mo(this->map_to_output()); |
75f65a3e | 772 | unsigned int shnum = this->shnum(); |
61ba1cf9 | 773 | unsigned int count = 0; |
75f65a3e ILT |
774 | // Skip the first, dummy, symbol. |
775 | psyms += sym_size; | |
61ba1cf9 | 776 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
777 | { |
778 | elfcpp::Sym<size, big_endian> sym(psyms); | |
779 | ||
b8e6aad9 ILT |
780 | Symbol_value<size>& lv(this->local_values_[i]); |
781 | ||
75f65a3e | 782 | unsigned int shndx = sym.get_st_shndx(); |
b8e6aad9 | 783 | lv.set_input_shndx(shndx); |
75f65a3e | 784 | |
063f12a8 ILT |
785 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
786 | lv.set_is_section_symbol(); | |
787 | ||
75f65a3e ILT |
788 | if (shndx >= elfcpp::SHN_LORESERVE) |
789 | { | |
61ba1cf9 | 790 | if (shndx == elfcpp::SHN_ABS) |
b8e6aad9 | 791 | lv.set_output_value(sym.get_st_value()); |
61ba1cf9 | 792 | else |
75f65a3e | 793 | { |
61ba1cf9 | 794 | // FIXME: Handle SHN_XINDEX. |
75f2446e ILT |
795 | this->error(_("unknown section index %u for local symbol %u"), |
796 | shndx, i); | |
797 | lv.set_output_value(0); | |
75f65a3e | 798 | } |
75f65a3e ILT |
799 | } |
800 | else | |
801 | { | |
802 | if (shndx >= shnum) | |
803 | { | |
75f2446e ILT |
804 | this->error(_("local symbol %u section index %u out of range"), |
805 | i, shndx); | |
806 | shndx = 0; | |
75f65a3e ILT |
807 | } |
808 | ||
b8e6aad9 ILT |
809 | Output_section* os = mo[shndx].output_section; |
810 | ||
811 | if (os == NULL) | |
61ba1cf9 | 812 | { |
b8e6aad9 ILT |
813 | lv.set_output_value(0); |
814 | lv.set_no_output_symtab_entry(); | |
61ba1cf9 ILT |
815 | continue; |
816 | } | |
817 | ||
b8e6aad9 ILT |
818 | if (mo[shndx].offset == -1) |
819 | lv.set_input_value(sym.get_st_value()); | |
820 | else | |
821 | lv.set_output_value(mo[shndx].output_section->address() | |
822 | + mo[shndx].offset | |
823 | + sym.get_st_value()); | |
75f65a3e ILT |
824 | } |
825 | ||
c06b7b0b ILT |
826 | // Decide whether this symbol should go into the output file. |
827 | ||
828 | if (sym.get_st_type() == elfcpp::STT_SECTION) | |
f6ce93d6 | 829 | { |
b8e6aad9 | 830 | lv.set_no_output_symtab_entry(); |
c06b7b0b ILT |
831 | continue; |
832 | } | |
645f8123 | 833 | |
c06b7b0b ILT |
834 | if (sym.get_st_name() >= strtab_size) |
835 | { | |
75f2446e ILT |
836 | this->error(_("local symbol %u section name out of range: %u >= %u"), |
837 | i, sym.get_st_name(), | |
838 | static_cast<unsigned int>(strtab_size)); | |
839 | lv.set_no_output_symtab_entry(); | |
840 | continue; | |
f6ce93d6 | 841 | } |
c06b7b0b ILT |
842 | |
843 | const char* name = pnames + sym.get_st_name(); | |
cfd73a4e | 844 | pool->add(name, true, NULL); |
b8e6aad9 | 845 | lv.set_output_symtab_index(index); |
c06b7b0b | 846 | ++index; |
c06b7b0b | 847 | ++count; |
75f65a3e ILT |
848 | } |
849 | ||
61ba1cf9 ILT |
850 | this->output_local_symbol_count_ = count; |
851 | ||
c06b7b0b | 852 | return index; |
75f65a3e ILT |
853 | } |
854 | ||
e727fa71 ILT |
855 | // Return the value of the local symbol symndx. |
856 | template<int size, bool big_endian> | |
857 | typename elfcpp::Elf_types<size>::Elf_Addr | |
858 | Sized_relobj<size, big_endian>::local_symbol_value(unsigned int symndx) const | |
859 | { | |
860 | gold_assert(symndx < this->local_symbol_count_); | |
861 | gold_assert(symndx < this->local_values_.size()); | |
862 | const Symbol_value<size>& lv(this->local_values_[symndx]); | |
863 | return lv.value(this, 0); | |
864 | } | |
865 | ||
b8e6aad9 | 866 | // Return the value of a local symbol defined in input section SHNDX, |
063f12a8 ILT |
867 | // with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL |
868 | // indicates whether the symbol is a section symbol. This handles | |
869 | // SHF_MERGE sections. | |
b8e6aad9 ILT |
870 | template<int size, bool big_endian> |
871 | typename elfcpp::Elf_types<size>::Elf_Addr | |
872 | Sized_relobj<size, big_endian>::local_value(unsigned int shndx, | |
873 | Address value, | |
063f12a8 | 874 | bool is_section_symbol, |
b8e6aad9 ILT |
875 | Address addend) const |
876 | { | |
877 | const std::vector<Map_to_output>& mo(this->map_to_output()); | |
878 | Output_section* os = mo[shndx].output_section; | |
879 | if (os == NULL) | |
880 | return addend; | |
881 | gold_assert(mo[shndx].offset == -1); | |
063f12a8 ILT |
882 | |
883 | // Do the mapping required by the output section. If this is not a | |
884 | // section symbol, then we want to map the symbol value, and then | |
885 | // include the addend. If this is a section symbol, then we need to | |
886 | // include the addend to figure out where in the section we are, | |
887 | // before we do the mapping. This will do the right thing provided | |
888 | // the assembler is careful to only convert a relocation in a merged | |
889 | // section to a section symbol if there is a zero addend. If the | |
890 | // assembler does not do this, then in general we can't know what to | |
891 | // do, because we can't distinguish the addend for the instruction | |
892 | // format from the addend for the section offset. | |
893 | ||
894 | if (is_section_symbol) | |
895 | return os->output_address(this, shndx, value + addend); | |
896 | else | |
897 | return addend + os->output_address(this, shndx, value); | |
b8e6aad9 ILT |
898 | } |
899 | ||
61ba1cf9 ILT |
900 | // Write out the local symbols. |
901 | ||
902 | template<int size, bool big_endian> | |
903 | void | |
f6ce93d6 | 904 | Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of, |
61ba1cf9 ILT |
905 | const Stringpool* sympool) |
906 | { | |
9e2dcb77 ILT |
907 | if (parameters->strip_all()) |
908 | return; | |
909 | ||
a3ad94ed | 910 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 911 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
912 | { |
913 | // This object has no symbols. Weird but legal. | |
914 | return; | |
915 | } | |
916 | ||
917 | // Read the symbol table section header. | |
645f8123 ILT |
918 | const unsigned int symtab_shndx = this->symtab_shndx_; |
919 | typename This::Shdr symtabshdr(this, | |
920 | this->elf_file_.section_header(symtab_shndx)); | |
a3ad94ed | 921 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 | 922 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 923 | gold_assert(loccount == symtabshdr.get_sh_info()); |
61ba1cf9 ILT |
924 | |
925 | // Read the local symbols. | |
926 | const int sym_size = This::sym_size; | |
92e059d8 | 927 | off_t locsize = loccount * sym_size; |
61ba1cf9 | 928 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
9eb9fa57 | 929 | locsize, false); |
61ba1cf9 | 930 | |
61ba1cf9 | 931 | // Read the symbol names. |
645f8123 ILT |
932 | const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
933 | off_t strtab_size; | |
934 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, | |
9eb9fa57 ILT |
935 | &strtab_size, |
936 | true); | |
61ba1cf9 ILT |
937 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
938 | ||
939 | // Get a view into the output file. | |
940 | off_t output_size = this->output_local_symbol_count_ * sym_size; | |
941 | unsigned char* oview = of->get_output_view(this->local_symbol_offset_, | |
942 | output_size); | |
943 | ||
c06b7b0b ILT |
944 | const std::vector<Map_to_output>& mo(this->map_to_output()); |
945 | ||
a3ad94ed | 946 | gold_assert(this->local_values_.size() == loccount); |
61ba1cf9 | 947 | |
61ba1cf9 | 948 | unsigned char* ov = oview; |
c06b7b0b | 949 | psyms += sym_size; |
92e059d8 | 950 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
61ba1cf9 ILT |
951 | { |
952 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 | 953 | |
b8e6aad9 | 954 | if (!this->local_values_[i].needs_output_symtab_entry()) |
f6ce93d6 | 955 | continue; |
61ba1cf9 ILT |
956 | |
957 | unsigned int st_shndx = isym.get_st_shndx(); | |
958 | if (st_shndx < elfcpp::SHN_LORESERVE) | |
959 | { | |
a3ad94ed | 960 | gold_assert(st_shndx < mo.size()); |
61ba1cf9 ILT |
961 | if (mo[st_shndx].output_section == NULL) |
962 | continue; | |
ead1e424 | 963 | st_shndx = mo[st_shndx].output_section->out_shndx(); |
61ba1cf9 ILT |
964 | } |
965 | ||
f6ce93d6 ILT |
966 | elfcpp::Sym_write<size, big_endian> osym(ov); |
967 | ||
a3ad94ed | 968 | gold_assert(isym.get_st_name() < strtab_size); |
c06b7b0b ILT |
969 | const char* name = pnames + isym.get_st_name(); |
970 | osym.put_st_name(sympool->get_offset(name)); | |
b8e6aad9 | 971 | osym.put_st_value(this->local_values_[i].value(this, 0)); |
61ba1cf9 ILT |
972 | osym.put_st_size(isym.get_st_size()); |
973 | osym.put_st_info(isym.get_st_info()); | |
974 | osym.put_st_other(isym.get_st_other()); | |
975 | osym.put_st_shndx(st_shndx); | |
976 | ||
977 | ov += sym_size; | |
978 | } | |
979 | ||
a3ad94ed | 980 | gold_assert(ov - oview == output_size); |
61ba1cf9 ILT |
981 | |
982 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
983 | } | |
984 | ||
f7e2ee48 ILT |
985 | // Set *INFO to symbolic information about the offset OFFSET in the |
986 | // section SHNDX. Return true if we found something, false if we | |
987 | // found nothing. | |
988 | ||
989 | template<int size, bool big_endian> | |
990 | bool | |
991 | Sized_relobj<size, big_endian>::get_symbol_location_info( | |
992 | unsigned int shndx, | |
993 | off_t offset, | |
994 | Symbol_location_info* info) | |
995 | { | |
996 | if (this->symtab_shndx_ == 0) | |
997 | return false; | |
998 | ||
999 | off_t symbols_size; | |
1000 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, | |
1001 | &symbols_size, | |
1002 | false); | |
1003 | ||
1004 | unsigned int symbol_names_shndx = this->section_link(this->symtab_shndx_); | |
1005 | off_t names_size; | |
1006 | const unsigned char* symbol_names_u = | |
1007 | this->section_contents(symbol_names_shndx, &names_size, false); | |
1008 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
1009 | ||
1010 | const int sym_size = This::sym_size; | |
1011 | const size_t count = symbols_size / sym_size; | |
1012 | ||
1013 | const unsigned char* p = symbols; | |
1014 | for (size_t i = 0; i < count; ++i, p += sym_size) | |
1015 | { | |
1016 | elfcpp::Sym<size, big_endian> sym(p); | |
1017 | ||
1018 | if (sym.get_st_type() == elfcpp::STT_FILE) | |
1019 | { | |
1020 | if (sym.get_st_name() >= names_size) | |
1021 | info->source_file = "(invalid)"; | |
1022 | else | |
1023 | info->source_file = symbol_names + sym.get_st_name(); | |
1024 | } | |
1025 | else if (sym.get_st_shndx() == shndx | |
1026 | && static_cast<off_t>(sym.get_st_value()) <= offset | |
1027 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) | |
5c2c6c95 | 1028 | > offset)) |
f7e2ee48 ILT |
1029 | { |
1030 | if (sym.get_st_name() > names_size) | |
1031 | info->enclosing_symbol_name = "(invalid)"; | |
1032 | else | |
1033 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); | |
1034 | return true; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | return false; | |
1039 | } | |
1040 | ||
54dc6425 ILT |
1041 | // Input_objects methods. |
1042 | ||
008db82e ILT |
1043 | // Add a regular relocatable object to the list. Return false if this |
1044 | // object should be ignored. | |
f6ce93d6 | 1045 | |
008db82e | 1046 | bool |
54dc6425 ILT |
1047 | Input_objects::add_object(Object* obj) |
1048 | { | |
019cdb1a ILT |
1049 | Target* target = obj->target(); |
1050 | if (this->target_ == NULL) | |
1051 | this->target_ = target; | |
1052 | else if (this->target_ != target) | |
1053 | { | |
1054 | gold_error(_("%s: incompatible target"), obj->name().c_str()); | |
1055 | return false; | |
1056 | } | |
1057 | ||
008db82e | 1058 | if (!obj->is_dynamic()) |
f6ce93d6 | 1059 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
008db82e ILT |
1060 | else |
1061 | { | |
1062 | // See if this is a duplicate SONAME. | |
1063 | Dynobj* dynobj = static_cast<Dynobj*>(obj); | |
1064 | ||
1065 | std::pair<Unordered_set<std::string>::iterator, bool> ins = | |
1066 | this->sonames_.insert(dynobj->soname()); | |
1067 | if (!ins.second) | |
1068 | { | |
1069 | // We have already seen a dynamic object with this soname. | |
1070 | return false; | |
1071 | } | |
1072 | ||
1073 | this->dynobj_list_.push_back(dynobj); | |
1074 | } | |
75f65a3e | 1075 | |
9025d29d ILT |
1076 | set_parameters_size_and_endianness(target->get_size(), |
1077 | target->is_big_endian()); | |
1078 | ||
008db82e | 1079 | return true; |
54dc6425 ILT |
1080 | } |
1081 | ||
92e059d8 ILT |
1082 | // Relocate_info methods. |
1083 | ||
1084 | // Return a string describing the location of a relocation. This is | |
1085 | // only used in error messages. | |
1086 | ||
1087 | template<int size, bool big_endian> | |
1088 | std::string | |
f7e2ee48 | 1089 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
92e059d8 | 1090 | { |
5c2c6c95 ILT |
1091 | // See if we can get line-number information from debugging sections. |
1092 | std::string filename; | |
1093 | std::string file_and_lineno; // Better than filename-only, if available. | |
1094 | for (unsigned int shndx = 0; shndx < this->object->shnum(); ++shndx) | |
1095 | if (this->object->section_name(shndx) == ".debug_line") | |
1096 | { | |
1097 | off_t debuglines_size; | |
1098 | const unsigned char* debuglines = this->object->section_contents( | |
1099 | shndx, &debuglines_size, false); | |
1100 | if (debuglines) | |
1101 | { | |
e43872e9 ILT |
1102 | Dwarf_line_info<size, big_endian> line_info(debuglines, |
1103 | debuglines_size); | |
1104 | line_info.read_line_mappings(); | |
5c2c6c95 ILT |
1105 | file_and_lineno = line_info.addr2line(this->data_shndx, offset); |
1106 | } | |
1107 | break; | |
1108 | } | |
1109 | ||
92e059d8 | 1110 | std::string ret(this->object->name()); |
f7e2ee48 ILT |
1111 | ret += ':'; |
1112 | Symbol_location_info info; | |
1113 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) | |
1114 | { | |
1115 | ret += " in function "; | |
5c2c6c95 ILT |
1116 | // We could demangle this name before printing, but we don't |
1117 | // bother because gcc runs linker output through a demangle | |
1118 | // filter itself. The only advantage to demangling here is if | |
1119 | // someone might call ld directly, rather than via gcc. If we | |
1120 | // did want to demangle, cplus_demangle() is in libiberty. | |
f7e2ee48 ILT |
1121 | ret += info.enclosing_symbol_name; |
1122 | ret += ":"; | |
5c2c6c95 ILT |
1123 | filename = info.source_file; |
1124 | } | |
1125 | ||
1126 | if (!file_and_lineno.empty()) | |
1127 | ret += file_and_lineno; | |
1128 | else | |
1129 | { | |
1130 | if (!filename.empty()) | |
1131 | ret += filename; | |
1132 | ret += "("; | |
1133 | ret += this->object->section_name(this->data_shndx); | |
1134 | char buf[100]; | |
1135 | // Offsets into sections have to be positive. | |
1136 | snprintf(buf, sizeof(buf), "+0x%lx", static_cast<long>(offset)); | |
1137 | ret += buf; | |
1138 | ret += ")"; | |
f7e2ee48 | 1139 | } |
92e059d8 ILT |
1140 | return ret; |
1141 | } | |
1142 | ||
bae7f79e ILT |
1143 | } // End namespace gold. |
1144 | ||
1145 | namespace | |
1146 | { | |
1147 | ||
1148 | using namespace gold; | |
1149 | ||
1150 | // Read an ELF file with the header and return the appropriate | |
1151 | // instance of Object. | |
1152 | ||
1153 | template<int size, bool big_endian> | |
1154 | Object* | |
1155 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
1156 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
1157 | { | |
1158 | int et = ehdr.get_e_type(); | |
bae7f79e ILT |
1159 | if (et == elfcpp::ET_REL) |
1160 | { | |
f6ce93d6 ILT |
1161 | Sized_relobj<size, big_endian>* obj = |
1162 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
bae7f79e ILT |
1163 | obj->setup(ehdr); |
1164 | return obj; | |
1165 | } | |
dbe717ef ILT |
1166 | else if (et == elfcpp::ET_DYN) |
1167 | { | |
1168 | Sized_dynobj<size, big_endian>* obj = | |
1169 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
1170 | obj->setup(ehdr); | |
1171 | return obj; | |
1172 | } | |
bae7f79e ILT |
1173 | else |
1174 | { | |
75f2446e ILT |
1175 | gold_error(_("%s: unsupported ELF file type %d"), |
1176 | name.c_str(), et); | |
1177 | return NULL; | |
bae7f79e ILT |
1178 | } |
1179 | } | |
1180 | ||
1181 | } // End anonymous namespace. | |
1182 | ||
1183 | namespace gold | |
1184 | { | |
1185 | ||
1186 | // Read an ELF file and return the appropriate instance of Object. | |
1187 | ||
1188 | Object* | |
1189 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
1190 | const unsigned char* p, off_t bytes) | |
1191 | { | |
1192 | if (bytes < elfcpp::EI_NIDENT) | |
1193 | { | |
75f2446e ILT |
1194 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1195 | return NULL; | |
bae7f79e ILT |
1196 | } |
1197 | ||
1198 | int v = p[elfcpp::EI_VERSION]; | |
1199 | if (v != elfcpp::EV_CURRENT) | |
1200 | { | |
1201 | if (v == elfcpp::EV_NONE) | |
75f2446e | 1202 | gold_error(_("%s: invalid ELF version 0"), name.c_str()); |
bae7f79e | 1203 | else |
75f2446e ILT |
1204 | gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v); |
1205 | return NULL; | |
bae7f79e ILT |
1206 | } |
1207 | ||
1208 | int c = p[elfcpp::EI_CLASS]; | |
1209 | if (c == elfcpp::ELFCLASSNONE) | |
1210 | { | |
75f2446e ILT |
1211 | gold_error(_("%s: invalid ELF class 0"), name.c_str()); |
1212 | return NULL; | |
bae7f79e ILT |
1213 | } |
1214 | else if (c != elfcpp::ELFCLASS32 | |
1215 | && c != elfcpp::ELFCLASS64) | |
1216 | { | |
75f2446e ILT |
1217 | gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c); |
1218 | return NULL; | |
bae7f79e ILT |
1219 | } |
1220 | ||
1221 | int d = p[elfcpp::EI_DATA]; | |
1222 | if (d == elfcpp::ELFDATANONE) | |
1223 | { | |
75f2446e ILT |
1224 | gold_error(_("%s: invalid ELF data encoding"), name.c_str()); |
1225 | return NULL; | |
bae7f79e ILT |
1226 | } |
1227 | else if (d != elfcpp::ELFDATA2LSB | |
1228 | && d != elfcpp::ELFDATA2MSB) | |
1229 | { | |
75f2446e ILT |
1230 | gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d); |
1231 | return NULL; | |
bae7f79e ILT |
1232 | } |
1233 | ||
1234 | bool big_endian = d == elfcpp::ELFDATA2MSB; | |
1235 | ||
1236 | if (c == elfcpp::ELFCLASS32) | |
1237 | { | |
1238 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
1239 | { | |
75f2446e ILT |
1240 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1241 | return NULL; | |
bae7f79e ILT |
1242 | } |
1243 | if (big_endian) | |
1244 | { | |
193a53d9 | 1245 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e ILT |
1246 | elfcpp::Ehdr<32, true> ehdr(p); |
1247 | return make_elf_sized_object<32, true>(name, input_file, | |
1248 | offset, ehdr); | |
193a53d9 | 1249 | #else |
75f2446e ILT |
1250 | gold_error(_("%s: not configured to support " |
1251 | "32-bit big-endian object"), | |
1252 | name.c_str()); | |
1253 | return NULL; | |
193a53d9 | 1254 | #endif |
bae7f79e ILT |
1255 | } |
1256 | else | |
1257 | { | |
193a53d9 | 1258 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e ILT |
1259 | elfcpp::Ehdr<32, false> ehdr(p); |
1260 | return make_elf_sized_object<32, false>(name, input_file, | |
1261 | offset, ehdr); | |
193a53d9 | 1262 | #else |
75f2446e ILT |
1263 | gold_error(_("%s: not configured to support " |
1264 | "32-bit little-endian object"), | |
1265 | name.c_str()); | |
1266 | return NULL; | |
193a53d9 | 1267 | #endif |
bae7f79e ILT |
1268 | } |
1269 | } | |
1270 | else | |
1271 | { | |
1272 | if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) | |
1273 | { | |
75f2446e ILT |
1274 | gold_error(_("%s: ELF file too short"), name.c_str()); |
1275 | return NULL; | |
bae7f79e ILT |
1276 | } |
1277 | if (big_endian) | |
1278 | { | |
193a53d9 | 1279 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e ILT |
1280 | elfcpp::Ehdr<64, true> ehdr(p); |
1281 | return make_elf_sized_object<64, true>(name, input_file, | |
1282 | offset, ehdr); | |
193a53d9 | 1283 | #else |
75f2446e ILT |
1284 | gold_error(_("%s: not configured to support " |
1285 | "64-bit big-endian object"), | |
1286 | name.c_str()); | |
1287 | return NULL; | |
193a53d9 | 1288 | #endif |
bae7f79e ILT |
1289 | } |
1290 | else | |
1291 | { | |
193a53d9 | 1292 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e ILT |
1293 | elfcpp::Ehdr<64, false> ehdr(p); |
1294 | return make_elf_sized_object<64, false>(name, input_file, | |
1295 | offset, ehdr); | |
193a53d9 | 1296 | #else |
75f2446e ILT |
1297 | gold_error(_("%s: not configured to support " |
1298 | "64-bit little-endian object"), | |
1299 | name.c_str()); | |
1300 | return NULL; | |
193a53d9 | 1301 | #endif |
bae7f79e ILT |
1302 | } |
1303 | } | |
1304 | } | |
1305 | ||
1306 | // Instantiate the templates we need. We could use the configure | |
1307 | // script to restrict this to only the ones for implemented targets. | |
1308 | ||
193a53d9 | 1309 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e | 1310 | template |
f6ce93d6 | 1311 | class Sized_relobj<32, false>; |
193a53d9 | 1312 | #endif |
bae7f79e | 1313 | |
193a53d9 | 1314 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e | 1315 | template |
f6ce93d6 | 1316 | class Sized_relobj<32, true>; |
193a53d9 | 1317 | #endif |
bae7f79e | 1318 | |
193a53d9 | 1319 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e | 1320 | template |
f6ce93d6 | 1321 | class Sized_relobj<64, false>; |
193a53d9 | 1322 | #endif |
bae7f79e | 1323 | |
193a53d9 | 1324 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e | 1325 | template |
f6ce93d6 | 1326 | class Sized_relobj<64, true>; |
193a53d9 | 1327 | #endif |
bae7f79e | 1328 | |
193a53d9 | 1329 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1330 | template |
1331 | struct Relocate_info<32, false>; | |
193a53d9 | 1332 | #endif |
92e059d8 | 1333 | |
193a53d9 | 1334 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1335 | template |
1336 | struct Relocate_info<32, true>; | |
193a53d9 | 1337 | #endif |
92e059d8 | 1338 | |
193a53d9 | 1339 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1340 | template |
1341 | struct Relocate_info<64, false>; | |
193a53d9 | 1342 | #endif |
92e059d8 | 1343 | |
193a53d9 | 1344 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1345 | template |
1346 | struct Relocate_info<64, true>; | |
193a53d9 | 1347 | #endif |
92e059d8 | 1348 | |
bae7f79e | 1349 | } // End namespace gold. |