1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
29 #include "libiberty.h"
31 #include "target-select.h"
32 #include "dwarf_reader.h"
45 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
46 // section and read it in. SYMTAB_SHNDX is the index of the symbol
47 // table we care about.
49 template<int size
, bool big_endian
>
51 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
53 if (!this->symtab_xindex_
.empty())
56 gold_assert(symtab_shndx
!= 0);
58 // Look through the sections in reverse order, on the theory that it
59 // is more likely to be near the end than the beginning.
60 unsigned int i
= object
->shnum();
64 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
65 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
67 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
72 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
75 // Read in the symtab_xindex_ array, given the section index of the
76 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
79 template<int size
, bool big_endian
>
81 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
82 const unsigned char* pshdrs
)
84 section_size_type bytecount
;
85 const unsigned char* contents
;
87 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
90 const unsigned char* p
= (pshdrs
92 * elfcpp::Elf_sizes
<size
>::shdr_size
));
93 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
94 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
95 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
98 gold_assert(this->symtab_xindex_
.empty());
99 this->symtab_xindex_
.reserve(bytecount
/ 4);
100 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
102 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
103 // We preadjust the section indexes we save.
104 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
108 // Symbol symndx has a section of SHN_XINDEX; return the real section
112 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
114 if (symndx
>= this->symtab_xindex_
.size())
116 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
118 return elfcpp::SHN_UNDEF
;
120 unsigned int shndx
= this->symtab_xindex_
[symndx
];
121 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
123 object
->error(_("extended index for symbol %u out of range: %u"),
125 return elfcpp::SHN_UNDEF
;
132 // Set the target based on fields in the ELF file header.
135 Object::set_target(int machine
, int size
, bool big_endian
, int osabi
,
138 Target
* target
= select_target(machine
, size
, big_endian
, osabi
, abiversion
);
140 gold_fatal(_("%s: unsupported ELF machine number %d"),
141 this->name().c_str(), machine
);
142 this->target_
= target
;
145 // Report an error for this object file. This is used by the
146 // elfcpp::Elf_file interface, and also called by the Object code
150 Object::error(const char* format
, ...) const
153 va_start(args
, format
);
155 if (vasprintf(&buf
, format
, args
) < 0)
158 gold_error(_("%s: %s"), this->name().c_str(), buf
);
162 // Return a view of the contents of a section.
165 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
168 Location
loc(this->do_section_contents(shndx
));
169 *plen
= convert_to_section_size_type(loc
.data_size
);
170 return this->get_view(loc
.file_offset
, *plen
, true, cache
);
173 // Read the section data into SD. This is code common to Sized_relobj
174 // and Sized_dynobj, so we put it into Object.
176 template<int size
, bool big_endian
>
178 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
179 Read_symbols_data
* sd
)
181 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
183 // Read the section headers.
184 const off_t shoff
= elf_file
->shoff();
185 const unsigned int shnum
= this->shnum();
186 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
189 // Read the section names.
190 const unsigned char* pshdrs
= sd
->section_headers
->data();
191 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
192 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
194 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
195 this->error(_("section name section has wrong type: %u"),
196 static_cast<unsigned int>(shdrnames
.get_sh_type()));
198 sd
->section_names_size
=
199 convert_to_section_size_type(shdrnames
.get_sh_size());
200 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
201 sd
->section_names_size
, false,
205 // If NAME is the name of a special .gnu.warning section, arrange for
206 // the warning to be issued. SHNDX is the section index. Return
207 // whether it is a warning section.
210 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
211 Symbol_table
* symtab
)
213 const char warn_prefix
[] = ".gnu.warning.";
214 const int warn_prefix_len
= sizeof warn_prefix
- 1;
215 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
217 // Read the section contents to get the warning text. It would
218 // be nicer if we only did this if we have to actually issue a
219 // warning. Unfortunately, warnings are issued as we relocate
220 // sections. That means that we can not lock the object then,
221 // as we might try to issue the same warning multiple times
223 section_size_type len
;
224 const unsigned char* contents
= this->section_contents(shndx
, &len
,
226 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
227 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
233 // Class Sized_relobj.
235 template<int size
, bool big_endian
>
236 Sized_relobj
<size
, big_endian
>::Sized_relobj(
237 const std::string
& name
,
238 Input_file
* input_file
,
240 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
241 : Relobj(name
, input_file
, offset
),
242 elf_file_(this, ehdr
),
244 local_symbol_count_(0),
245 output_local_symbol_count_(0),
246 output_local_dynsym_count_(0),
248 local_symbol_offset_(0),
249 local_dynsym_offset_(0),
251 local_got_offsets_(),
256 template<int size
, bool big_endian
>
257 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
261 // Set up an object file based on the file header. This sets up the
262 // target and reads the section information.
264 template<int size
, bool big_endian
>
266 Sized_relobj
<size
, big_endian
>::setup(
267 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
269 this->set_target(ehdr
.get_e_machine(), size
, big_endian
,
270 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
271 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
273 const unsigned int shnum
= this->elf_file_
.shnum();
274 this->set_shnum(shnum
);
277 // Find the SHT_SYMTAB section, given the section headers. The ELF
278 // standard says that maybe in the future there can be more than one
279 // SHT_SYMTAB section. Until somebody figures out how that could
280 // work, we assume there is only one.
282 template<int size
, bool big_endian
>
284 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
286 const unsigned int shnum
= this->shnum();
287 this->symtab_shndx_
= 0;
290 // Look through the sections in reverse order, since gas tends
291 // to put the symbol table at the end.
292 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
293 unsigned int i
= shnum
;
294 unsigned int xindex_shndx
= 0;
295 unsigned int xindex_link
= 0;
299 p
-= This::shdr_size
;
300 typename
This::Shdr
shdr(p
);
301 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
303 this->symtab_shndx_
= i
;
304 if (xindex_shndx
> 0 && xindex_link
== i
)
307 new Xindex(this->elf_file_
.large_shndx_offset());
308 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
311 this->set_xindex(xindex
);
316 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
317 // one. This will work if it follows the SHT_SYMTAB
319 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
322 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
328 // Return the Xindex structure to use for object with lots of
331 template<int size
, bool big_endian
>
333 Sized_relobj
<size
, big_endian
>::do_initialize_xindex()
335 gold_assert(this->symtab_shndx_
!= -1U);
336 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
337 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
341 // Return whether SHDR has the right type and flags to be a GNU
342 // .eh_frame section.
344 template<int size
, bool big_endian
>
346 Sized_relobj
<size
, big_endian
>::check_eh_frame_flags(
347 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
349 return (shdr
->get_sh_type() == elfcpp::SHT_PROGBITS
350 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
353 // Return whether there is a GNU .eh_frame section, given the section
354 // headers and the section names.
356 template<int size
, bool big_endian
>
358 Sized_relobj
<size
, big_endian
>::find_eh_frame(
359 const unsigned char* pshdrs
,
361 section_size_type names_size
) const
363 const unsigned int shnum
= this->shnum();
364 const unsigned char* p
= pshdrs
+ This::shdr_size
;
365 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
367 typename
This::Shdr
shdr(p
);
368 if (this->check_eh_frame_flags(&shdr
))
370 if (shdr
.get_sh_name() >= names_size
)
372 this->error(_("bad section name offset for section %u: %lu"),
373 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
377 const char* name
= names
+ shdr
.get_sh_name();
378 if (strcmp(name
, ".eh_frame") == 0)
385 // Read the sections and symbols from an object file.
387 template<int size
, bool big_endian
>
389 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
391 this->read_section_data(&this->elf_file_
, sd
);
393 const unsigned char* const pshdrs
= sd
->section_headers
->data();
395 this->find_symtab(pshdrs
);
397 const unsigned char* namesu
= sd
->section_names
->data();
398 const char* names
= reinterpret_cast<const char*>(namesu
);
399 if (memmem(names
, sd
->section_names_size
, ".eh_frame", 10) != NULL
)
401 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
402 this->has_eh_frame_
= true;
406 sd
->symbols_size
= 0;
407 sd
->external_symbols_offset
= 0;
408 sd
->symbol_names
= NULL
;
409 sd
->symbol_names_size
= 0;
411 if (this->symtab_shndx_
== 0)
413 // No symbol table. Weird but legal.
417 // Get the symbol table section header.
418 typename
This::Shdr
symtabshdr(pshdrs
419 + this->symtab_shndx_
* This::shdr_size
);
420 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
422 // If this object has a .eh_frame section, we need all the symbols.
423 // Otherwise we only need the external symbols. While it would be
424 // simpler to just always read all the symbols, I've seen object
425 // files with well over 2000 local symbols, which for a 64-bit
426 // object file format is over 5 pages that we don't need to read
429 const int sym_size
= This::sym_size
;
430 const unsigned int loccount
= symtabshdr
.get_sh_info();
431 this->local_symbol_count_
= loccount
;
432 this->local_values_
.resize(loccount
);
433 section_offset_type locsize
= loccount
* sym_size
;
434 off_t dataoff
= symtabshdr
.get_sh_offset();
435 section_size_type datasize
=
436 convert_to_section_size_type(symtabshdr
.get_sh_size());
437 off_t extoff
= dataoff
+ locsize
;
438 section_size_type extsize
= datasize
- locsize
;
440 off_t readoff
= this->has_eh_frame_
? dataoff
: extoff
;
441 section_size_type readsize
= this->has_eh_frame_
? datasize
: extsize
;
443 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
445 // Read the section header for the symbol names.
446 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
447 if (strtab_shndx
>= this->shnum())
449 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
452 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
453 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
455 this->error(_("symbol table name section has wrong type: %u"),
456 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
460 // Read the symbol names.
461 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
462 strtabshdr
.get_sh_size(),
465 sd
->symbols
= fvsymtab
;
466 sd
->symbols_size
= readsize
;
467 sd
->external_symbols_offset
= this->has_eh_frame_
? locsize
: 0;
468 sd
->symbol_names
= fvstrtab
;
469 sd
->symbol_names_size
=
470 convert_to_section_size_type(strtabshdr
.get_sh_size());
473 // Return the section index of symbol SYM. Set *VALUE to its value in
474 // the object file. Set *IS_ORDINARY if this is an ordinary section
475 // index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE.
476 // Note that for a symbol which is not defined in this object file,
477 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
478 // the final value of the symbol in the link.
480 template<int size
, bool big_endian
>
482 Sized_relobj
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
486 section_size_type symbols_size
;
487 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
491 const size_t count
= symbols_size
/ This::sym_size
;
492 gold_assert(sym
< count
);
494 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
495 *value
= elfsym
.get_st_value();
497 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
500 // Return whether to include a section group in the link. LAYOUT is
501 // used to keep track of which section groups we have already seen.
502 // INDEX is the index of the section group and SHDR is the section
503 // header. If we do not want to include this group, we set bits in
504 // OMIT for each section which should be discarded.
506 template<int size
, bool big_endian
>
508 Sized_relobj
<size
, big_endian
>::include_section_group(
509 Symbol_table
* symtab
,
513 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
514 std::vector
<bool>* omit
)
516 // Read the section contents.
517 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
518 shdr
.get_sh_size(), true, false);
519 const elfcpp::Elf_Word
* pword
=
520 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
522 // The first word contains flags. We only care about COMDAT section
523 // groups. Other section groups are always included in the link
524 // just like ordinary sections.
525 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
527 // Look up the group signature, which is the name of a symbol. This
528 // is a lot of effort to go to to read a string. Why didn't they
529 // just have the group signature point into the string table, rather
530 // than indirect through a symbol?
532 // Get the appropriate symbol table header (this will normally be
533 // the single SHT_SYMTAB section, but in principle it need not be).
534 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
535 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
537 // Read the symbol table entry.
538 unsigned int symndx
= shdr
.get_sh_info();
539 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
541 this->error(_("section group %u info %u out of range"),
545 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
546 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
548 elfcpp::Sym
<size
, big_endian
> sym(psym
);
550 // Read the symbol table names.
551 section_size_type symnamelen
;
552 const unsigned char* psymnamesu
;
553 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
555 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
557 // Get the section group signature.
558 if (sym
.get_st_name() >= symnamelen
)
560 this->error(_("symbol %u name offset %u out of range"),
561 symndx
, sym
.get_st_name());
565 const char* signature
= psymnames
+ sym
.get_st_name();
567 // It seems that some versions of gas will create a section group
568 // associated with a section symbol, and then fail to give a name to
569 // the section symbol. In such a case, use the name of the section.
571 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
574 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
577 if (!is_ordinary
|| sym_shndx
>= this->shnum())
579 this->error(_("symbol %u invalid section index %u"),
583 secname
= this->section_name(sym_shndx
);
584 signature
= secname
.c_str();
587 // Record this section group, and see whether we've already seen one
588 // with the same signature.
590 if ((flags
& elfcpp::GRP_COMDAT
) == 0
591 || layout
->add_comdat(signature
, true))
593 if (parameters
->options().relocatable())
594 layout
->layout_group(symtab
, this, index
, name
, signature
, shdr
,
599 // This is a duplicate. We want to discard the sections in this
601 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
602 for (size_t i
= 1; i
< count
; ++i
)
604 elfcpp::Elf_Word secnum
=
605 elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
);
606 if (secnum
>= this->shnum())
608 this->error(_("section %u in section group %u out of range"),
612 (*omit
)[secnum
] = true;
618 // Whether to include a linkonce section in the link. NAME is the
619 // name of the section and SHDR is the section header.
621 // Linkonce sections are a GNU extension implemented in the original
622 // GNU linker before section groups were defined. The semantics are
623 // that we only include one linkonce section with a given name. The
624 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
625 // where T is the type of section and SYMNAME is the name of a symbol.
626 // In an attempt to make linkonce sections interact well with section
627 // groups, we try to identify SYMNAME and use it like a section group
628 // signature. We want to block section groups with that signature,
629 // but not other linkonce sections with that signature. We also use
630 // the full name of the linkonce section as a normal section group
633 template<int size
, bool big_endian
>
635 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
638 const elfcpp::Shdr
<size
, big_endian
>&)
640 // In general the symbol name we want will be the string following
641 // the last '.'. However, we have to handle the case of
642 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
643 // some versions of gcc. So we use a heuristic: if the name starts
644 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
645 // we look for the last '.'. We can't always simply skip
646 // ".gnu.linkonce.X", because we have to deal with cases like
647 // ".gnu.linkonce.d.rel.ro.local".
648 const char* const linkonce_t
= ".gnu.linkonce.t.";
650 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
651 symname
= name
+ strlen(linkonce_t
);
653 symname
= strrchr(name
, '.') + 1;
654 bool include1
= layout
->add_comdat(symname
, false);
655 bool include2
= layout
->add_comdat(name
, true);
656 return include1
&& include2
;
659 // Lay out the input sections. We walk through the sections and check
660 // whether they should be included in the link. If they should, we
661 // pass them to the Layout object, which will return an output section
664 template<int size
, bool big_endian
>
666 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
668 Read_symbols_data
* sd
)
670 const unsigned int shnum
= this->shnum();
674 // Get the section headers.
675 const unsigned char* pshdrs
= sd
->section_headers
->data();
677 // Get the section names.
678 const unsigned char* pnamesu
= sd
->section_names
->data();
679 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
681 // For each section, record the index of the reloc section if any.
682 // Use 0 to mean that there is no reloc section, -1U to mean that
683 // there is more than one.
684 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
685 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
686 // Skip the first, dummy, section.
687 pshdrs
+= This::shdr_size
;
688 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
690 typename
This::Shdr
shdr(pshdrs
);
692 unsigned int sh_type
= shdr
.get_sh_type();
693 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
695 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
696 if (target_shndx
== 0 || target_shndx
>= shnum
)
698 this->error(_("relocation section %u has bad info %u"),
703 if (reloc_shndx
[target_shndx
] != 0)
704 reloc_shndx
[target_shndx
] = -1U;
707 reloc_shndx
[target_shndx
] = i
;
708 reloc_type
[target_shndx
] = sh_type
;
713 std::vector
<Map_to_output
>& map_sections(this->map_to_output());
714 map_sections
.resize(shnum
);
716 // If we are only linking for symbols, then there is nothing else to
718 if (this->input_file()->just_symbols())
720 delete sd
->section_headers
;
721 sd
->section_headers
= NULL
;
722 delete sd
->section_names
;
723 sd
->section_names
= NULL
;
727 // Whether we've seen a .note.GNU-stack section.
728 bool seen_gnu_stack
= false;
729 // The flags of a .note.GNU-stack section.
730 uint64_t gnu_stack_flags
= 0;
732 // Keep track of which sections to omit.
733 std::vector
<bool> omit(shnum
, false);
735 // Keep track of reloc sections when emitting relocations.
736 const bool relocatable
= parameters
->options().relocatable();
737 const bool emit_relocs
= (relocatable
738 || parameters
->options().emit_relocs());
739 std::vector
<unsigned int> reloc_sections
;
741 // Keep track of .eh_frame sections.
742 std::vector
<unsigned int> eh_frame_sections
;
744 // Skip the first, dummy, section.
745 pshdrs
= sd
->section_headers
->data() + This::shdr_size
;
746 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
748 typename
This::Shdr
shdr(pshdrs
);
750 if (shdr
.get_sh_name() >= sd
->section_names_size
)
752 this->error(_("bad section name offset for section %u: %lu"),
753 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
757 const char* name
= pnames
+ shdr
.get_sh_name();
759 if (this->handle_gnu_warning_section(name
, i
, symtab
))
765 // The .note.GNU-stack section is special. It gives the
766 // protection flags that this object file requires for the stack
768 if (strcmp(name
, ".note.GNU-stack") == 0)
770 seen_gnu_stack
= true;
771 gnu_stack_flags
|= shdr
.get_sh_flags();
775 bool discard
= omit
[i
];
778 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
780 if (!this->include_section_group(symtab
, layout
, i
, name
, shdr
,
784 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
785 && Layout::is_linkonce(name
))
787 if (!this->include_linkonce_section(layout
, name
, shdr
))
794 // Do not include this section in the link.
795 map_sections
[i
].output_section
= NULL
;
799 // When doing a relocatable link we are going to copy input
800 // reloc sections into the output. We only want to copy the
801 // ones associated with sections which are not being discarded.
802 // However, we don't know that yet for all sections. So save
803 // reloc sections and process them later.
805 && (shdr
.get_sh_type() == elfcpp::SHT_REL
806 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
808 reloc_sections
.push_back(i
);
812 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
815 // The .eh_frame section is special. It holds exception frame
816 // information that we need to read in order to generate the
817 // exception frame header. We process these after all the other
818 // sections so that the exception frame reader can reliably
819 // determine which sections are being discarded, and discard the
820 // corresponding information.
822 && strcmp(name
, ".eh_frame") == 0
823 && this->check_eh_frame_flags(&shdr
))
825 eh_frame_sections
.push_back(i
);
830 Output_section
* os
= layout
->layout(this, i
, name
, shdr
,
831 reloc_shndx
[i
], reloc_type
[i
],
834 map_sections
[i
].output_section
= os
;
835 map_sections
[i
].offset
= offset
;
837 // If this section requires special handling, and if there are
838 // relocs that apply to it, then we must do the special handling
839 // before we apply the relocs.
840 if (offset
== -1 && reloc_shndx
[i
] != 0)
841 this->set_relocs_must_follow_section_writes();
844 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
);
846 // When doing a relocatable link handle the reloc sections at the
849 this->size_relocatable_relocs();
850 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
851 p
!= reloc_sections
.end();
855 const unsigned char* pshdr
;
856 pshdr
= sd
->section_headers
->data() + i
* This::shdr_size
;
857 typename
This::Shdr
shdr(pshdr
);
859 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
860 if (data_shndx
>= shnum
)
862 // We already warned about this above.
866 Output_section
* data_section
= map_sections
[data_shndx
].output_section
;
867 if (data_section
== NULL
)
869 map_sections
[i
].output_section
= NULL
;
873 Relocatable_relocs
* rr
= new Relocatable_relocs();
874 this->set_relocatable_relocs(i
, rr
);
876 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
878 map_sections
[i
].output_section
= os
;
879 map_sections
[i
].offset
= -1;
882 // Handle the .eh_frame sections at the end.
883 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
884 p
!= eh_frame_sections
.end();
887 gold_assert(this->has_eh_frame_
);
888 gold_assert(sd
->external_symbols_offset
!= 0);
891 const unsigned char *pshdr
;
892 pshdr
= sd
->section_headers
->data() + i
* This::shdr_size
;
893 typename
This::Shdr
shdr(pshdr
);
896 Output_section
* os
= layout
->layout_eh_frame(this,
899 sd
->symbol_names
->data(),
900 sd
->symbol_names_size
,
905 map_sections
[i
].output_section
= os
;
906 map_sections
[i
].offset
= offset
;
908 // If this section requires special handling, and if there are
909 // relocs that apply to it, then we must do the special handling
910 // before we apply the relocs.
911 if (offset
== -1 && reloc_shndx
[i
] != 0)
912 this->set_relocs_must_follow_section_writes();
915 delete sd
->section_headers
;
916 sd
->section_headers
= NULL
;
917 delete sd
->section_names
;
918 sd
->section_names
= NULL
;
921 // Add the symbols to the symbol table.
923 template<int size
, bool big_endian
>
925 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
926 Read_symbols_data
* sd
)
928 if (sd
->symbols
== NULL
)
930 gold_assert(sd
->symbol_names
== NULL
);
934 const int sym_size
= This::sym_size
;
935 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
937 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
939 this->error(_("size of symbols is not multiple of symbol size"));
943 this->symbols_
.resize(symcount
);
945 const char* sym_names
=
946 reinterpret_cast<const char*>(sd
->symbol_names
->data());
947 symtab
->add_from_relobj(this,
948 sd
->symbols
->data() + sd
->external_symbols_offset
,
949 symcount
, this->local_symbol_count_
,
950 sym_names
, sd
->symbol_names_size
,
955 delete sd
->symbol_names
;
956 sd
->symbol_names
= NULL
;
959 // First pass over the local symbols. Here we add their names to
960 // *POOL and *DYNPOOL, and we store the symbol value in
961 // THIS->LOCAL_VALUES_. This function is always called from a
962 // singleton thread. This is followed by a call to
963 // finalize_local_symbols.
965 template<int size
, bool big_endian
>
967 Sized_relobj
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
970 gold_assert(this->symtab_shndx_
!= -1U);
971 if (this->symtab_shndx_
== 0)
973 // This object has no symbols. Weird but legal.
977 // Read the symbol table section header.
978 const unsigned int symtab_shndx
= this->symtab_shndx_
;
979 typename
This::Shdr
symtabshdr(this,
980 this->elf_file_
.section_header(symtab_shndx
));
981 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
983 // Read the local symbols.
984 const int sym_size
= This::sym_size
;
985 const unsigned int loccount
= this->local_symbol_count_
;
986 gold_assert(loccount
== symtabshdr
.get_sh_info());
987 off_t locsize
= loccount
* sym_size
;
988 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
989 locsize
, true, true);
991 // Read the symbol names.
992 const unsigned int strtab_shndx
=
993 this->adjust_shndx(symtabshdr
.get_sh_link());
994 section_size_type strtab_size
;
995 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
998 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1000 // Loop over the local symbols.
1002 const std::vector
<Map_to_output
>& mo(this->map_to_output());
1003 unsigned int shnum
= this->shnum();
1004 unsigned int count
= 0;
1005 unsigned int dyncount
= 0;
1006 // Skip the first, dummy, symbol.
1008 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1010 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1012 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1015 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1017 lv
.set_input_shndx(shndx
, is_ordinary
);
1019 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1020 lv
.set_is_section_symbol();
1021 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
1022 lv
.set_is_tls_symbol();
1024 // Save the input symbol value for use in do_finalize_local_symbols().
1025 lv
.set_input_value(sym
.get_st_value());
1027 // Decide whether this symbol should go into the output file.
1029 if (shndx
< shnum
&& mo
[shndx
].output_section
== NULL
)
1031 lv
.set_no_output_symtab_entry();
1032 gold_assert(!lv
.needs_output_dynsym_entry());
1036 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1038 lv
.set_no_output_symtab_entry();
1039 gold_assert(!lv
.needs_output_dynsym_entry());
1043 if (sym
.get_st_name() >= strtab_size
)
1045 this->error(_("local symbol %u section name out of range: %u >= %u"),
1046 i
, sym
.get_st_name(),
1047 static_cast<unsigned int>(strtab_size
));
1048 lv
.set_no_output_symtab_entry();
1052 // Add the symbol to the symbol table string pool.
1053 const char* name
= pnames
+ sym
.get_st_name();
1054 pool
->add(name
, true, NULL
);
1057 // If needed, add the symbol to the dynamic symbol table string pool.
1058 if (lv
.needs_output_dynsym_entry())
1060 dynpool
->add(name
, true, NULL
);
1065 this->output_local_symbol_count_
= count
;
1066 this->output_local_dynsym_count_
= dyncount
;
1069 // Finalize the local symbols. Here we set the final value in
1070 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
1071 // This function is always called from a singleton thread. The actual
1072 // output of the local symbols will occur in a separate task.
1074 template<int size
, bool big_endian
>
1076 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
1079 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1081 const unsigned int loccount
= this->local_symbol_count_
;
1082 this->local_symbol_offset_
= off
;
1084 const std::vector
<Map_to_output
>& mo(this->map_to_output());
1085 unsigned int shnum
= this->shnum();
1087 for (unsigned int i
= 1; i
< loccount
; ++i
)
1089 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1092 unsigned int shndx
= lv
.input_shndx(&is_ordinary
);
1094 // Set the output symbol value.
1098 if (shndx
== elfcpp::SHN_ABS
|| shndx
== elfcpp::SHN_COMMON
)
1099 lv
.set_output_value(lv
.input_value());
1102 this->error(_("unknown section index %u for local symbol %u"),
1104 lv
.set_output_value(0);
1111 this->error(_("local symbol %u section index %u out of range"),
1116 Output_section
* os
= mo
[shndx
].output_section
;
1120 lv
.set_output_value(0);
1123 else if (mo
[shndx
].offset
== -1)
1125 // This is a SHF_MERGE section or one which otherwise
1126 // requires special handling. We get the output address
1127 // of the start of the merged section. If this is not a
1128 // section symbol, we can then determine the final
1129 // value. If it is a section symbol, we can not, as in
1130 // that case we have to consider the addend to determine
1131 // the value to use in a relocation.
1132 if (!lv
.is_section_symbol())
1133 lv
.set_output_value(os
->output_address(this, shndx
,
1137 section_offset_type start
=
1138 os
->starting_output_address(this, shndx
);
1139 Merged_symbol_value
<size
>* msv
=
1140 new Merged_symbol_value
<size
>(lv
.input_value(), start
);
1141 lv
.set_merged_symbol_value(msv
);
1144 else if (lv
.is_tls_symbol())
1145 lv
.set_output_value(os
->tls_offset()
1147 + lv
.input_value());
1149 lv
.set_output_value(os
->address()
1151 + lv
.input_value());
1154 if (lv
.needs_output_symtab_entry())
1156 lv
.set_output_symtab_index(index
);
1163 // Set the output dynamic symbol table indexes for the local variables.
1165 template<int size
, bool big_endian
>
1167 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_indexes(unsigned int index
)
1169 const unsigned int loccount
= this->local_symbol_count_
;
1170 for (unsigned int i
= 1; i
< loccount
; ++i
)
1172 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1173 if (lv
.needs_output_dynsym_entry())
1175 lv
.set_output_dynsym_index(index
);
1182 // Set the offset where local dynamic symbol information will be stored.
1183 // Returns the count of local symbols contributed to the symbol table by
1186 template<int size
, bool big_endian
>
1188 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
1190 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1191 this->local_dynsym_offset_
= off
;
1192 return this->output_local_dynsym_count_
;
1195 // Write out the local symbols.
1197 template<int size
, bool big_endian
>
1199 Sized_relobj
<size
, big_endian
>::write_local_symbols(
1201 const Stringpool
* sympool
,
1202 const Stringpool
* dynpool
,
1203 Output_symtab_xindex
* symtab_xindex
,
1204 Output_symtab_xindex
* dynsym_xindex
)
1206 if (parameters
->options().strip_all()
1207 && this->output_local_dynsym_count_
== 0)
1210 gold_assert(this->symtab_shndx_
!= -1U);
1211 if (this->symtab_shndx_
== 0)
1213 // This object has no symbols. Weird but legal.
1217 // Read the symbol table section header.
1218 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1219 typename
This::Shdr
symtabshdr(this,
1220 this->elf_file_
.section_header(symtab_shndx
));
1221 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1222 const unsigned int loccount
= this->local_symbol_count_
;
1223 gold_assert(loccount
== symtabshdr
.get_sh_info());
1225 // Read the local symbols.
1226 const int sym_size
= This::sym_size
;
1227 off_t locsize
= loccount
* sym_size
;
1228 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1229 locsize
, true, false);
1231 // Read the symbol names.
1232 const unsigned int strtab_shndx
=
1233 this->adjust_shndx(symtabshdr
.get_sh_link());
1234 section_size_type strtab_size
;
1235 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1238 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1240 // Get views into the output file for the portions of the symbol table
1241 // and the dynamic symbol table that we will be writing.
1242 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
1243 unsigned char* oview
= NULL
;
1244 if (output_size
> 0)
1245 oview
= of
->get_output_view(this->local_symbol_offset_
, output_size
);
1247 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
1248 unsigned char* dyn_oview
= NULL
;
1249 if (dyn_output_size
> 0)
1250 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
1253 const std::vector
<Map_to_output
>& mo(this->map_to_output());
1255 gold_assert(this->local_values_
.size() == loccount
);
1257 unsigned char* ov
= oview
;
1258 unsigned char* dyn_ov
= dyn_oview
;
1260 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1262 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
1264 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1267 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
1271 gold_assert(st_shndx
< mo
.size());
1272 if (mo
[st_shndx
].output_section
== NULL
)
1274 st_shndx
= mo
[st_shndx
].output_section
->out_shndx();
1275 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
1277 if (lv
.needs_output_symtab_entry())
1278 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
1279 if (lv
.needs_output_dynsym_entry())
1280 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
1281 st_shndx
= elfcpp::SHN_XINDEX
;
1285 // Write the symbol to the output symbol table.
1286 if (!parameters
->options().strip_all()
1287 && lv
.needs_output_symtab_entry())
1289 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
1291 gold_assert(isym
.get_st_name() < strtab_size
);
1292 const char* name
= pnames
+ isym
.get_st_name();
1293 osym
.put_st_name(sympool
->get_offset(name
));
1294 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1295 osym
.put_st_size(isym
.get_st_size());
1296 osym
.put_st_info(isym
.get_st_info());
1297 osym
.put_st_other(isym
.get_st_other());
1298 osym
.put_st_shndx(st_shndx
);
1303 // Write the symbol to the output dynamic symbol table.
1304 if (lv
.needs_output_dynsym_entry())
1306 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
1307 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
1309 gold_assert(isym
.get_st_name() < strtab_size
);
1310 const char* name
= pnames
+ isym
.get_st_name();
1311 osym
.put_st_name(dynpool
->get_offset(name
));
1312 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1313 osym
.put_st_size(isym
.get_st_size());
1314 osym
.put_st_info(isym
.get_st_info());
1315 osym
.put_st_other(isym
.get_st_other());
1316 osym
.put_st_shndx(st_shndx
);
1323 if (output_size
> 0)
1325 gold_assert(ov
- oview
== output_size
);
1326 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
1329 if (dyn_output_size
> 0)
1331 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
1332 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
1337 // Set *INFO to symbolic information about the offset OFFSET in the
1338 // section SHNDX. Return true if we found something, false if we
1341 template<int size
, bool big_endian
>
1343 Sized_relobj
<size
, big_endian
>::get_symbol_location_info(
1346 Symbol_location_info
* info
)
1348 if (this->symtab_shndx_
== 0)
1351 section_size_type symbols_size
;
1352 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
1356 unsigned int symbol_names_shndx
=
1357 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
1358 section_size_type names_size
;
1359 const unsigned char* symbol_names_u
=
1360 this->section_contents(symbol_names_shndx
, &names_size
, false);
1361 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
1363 const int sym_size
= This::sym_size
;
1364 const size_t count
= symbols_size
/ sym_size
;
1366 const unsigned char* p
= symbols
;
1367 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1369 elfcpp::Sym
<size
, big_endian
> sym(p
);
1371 if (sym
.get_st_type() == elfcpp::STT_FILE
)
1373 if (sym
.get_st_name() >= names_size
)
1374 info
->source_file
= "(invalid)";
1376 info
->source_file
= symbol_names
+ sym
.get_st_name();
1381 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1384 && st_shndx
== shndx
1385 && static_cast<off_t
>(sym
.get_st_value()) <= offset
1386 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
1389 if (sym
.get_st_name() > names_size
)
1390 info
->enclosing_symbol_name
= "(invalid)";
1393 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
1394 if (parameters
->options().do_demangle())
1396 char* demangled_name
= cplus_demangle(
1397 info
->enclosing_symbol_name
.c_str(),
1398 DMGL_ANSI
| DMGL_PARAMS
);
1399 if (demangled_name
!= NULL
)
1401 info
->enclosing_symbol_name
.assign(demangled_name
);
1402 free(demangled_name
);
1413 // Input_objects methods.
1415 // Add a regular relocatable object to the list. Return false if this
1416 // object should be ignored.
1419 Input_objects::add_object(Object
* obj
)
1421 // Set the global target from the first object file we recognize.
1422 Target
* target
= obj
->target();
1423 if (!parameters
->target_valid())
1424 set_parameters_target(target
);
1425 else if (target
!= ¶meters
->target())
1427 obj
->error(_("incompatible target"));
1431 // Print the filename if the -t/--trace option is selected.
1432 if (parameters
->options().trace())
1433 gold_info("%s", obj
->name().c_str());
1435 if (!obj
->is_dynamic())
1436 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
1439 // See if this is a duplicate SONAME.
1440 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
1441 const char* soname
= dynobj
->soname();
1443 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
1444 this->sonames_
.insert(soname
);
1447 // We have already seen a dynamic object with this soname.
1451 this->dynobj_list_
.push_back(dynobj
);
1453 // If this is -lc, remember the directory in which we found it.
1454 // We use this when issuing warnings about undefined symbols: as
1455 // a heuristic, we don't warn about system libraries found in
1456 // the same directory as -lc.
1457 if (strncmp(soname
, "libc.so", 7) == 0)
1459 const char* object_name
= dynobj
->name().c_str();
1460 const char* base
= lbasename(object_name
);
1461 if (base
!= object_name
)
1462 this->system_library_directory_
.assign(object_name
,
1463 base
- 1 - object_name
);
1470 // Return whether an object was found in the system library directory.
1473 Input_objects::found_in_system_library_directory(const Object
* object
) const
1475 return (!this->system_library_directory_
.empty()
1476 && object
->name().compare(0,
1477 this->system_library_directory_
.size(),
1478 this->system_library_directory_
) == 0);
1481 // For each dynamic object, record whether we've seen all of its
1482 // explicit dependencies.
1485 Input_objects::check_dynamic_dependencies() const
1487 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
1488 p
!= this->dynobj_list_
.end();
1491 const Dynobj::Needed
& needed((*p
)->needed());
1492 bool found_all
= true;
1493 for (Dynobj::Needed::const_iterator pneeded
= needed
.begin();
1494 pneeded
!= needed
.end();
1497 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
1503 (*p
)->set_has_unknown_needed_entries(!found_all
);
1507 // Relocate_info methods.
1509 // Return a string describing the location of a relocation. This is
1510 // only used in error messages.
1512 template<int size
, bool big_endian
>
1514 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
1516 // See if we can get line-number information from debugging sections.
1517 std::string filename
;
1518 std::string file_and_lineno
; // Better than filename-only, if available.
1520 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
1521 // This will be "" if we failed to parse the debug info for any reason.
1522 file_and_lineno
= line_info
.addr2line(this->data_shndx
, offset
);
1524 std::string
ret(this->object
->name());
1526 Symbol_location_info info
;
1527 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
1529 ret
+= " in function ";
1530 ret
+= info
.enclosing_symbol_name
;
1532 filename
= info
.source_file
;
1535 if (!file_and_lineno
.empty())
1536 ret
+= file_and_lineno
;
1539 if (!filename
.empty())
1542 ret
+= this->object
->section_name(this->data_shndx
);
1544 // Offsets into sections have to be positive.
1545 snprintf(buf
, sizeof(buf
), "+0x%lx", static_cast<long>(offset
));
1552 } // End namespace gold.
1557 using namespace gold
;
1559 // Read an ELF file with the header and return the appropriate
1560 // instance of Object.
1562 template<int size
, bool big_endian
>
1564 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
1565 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1567 int et
= ehdr
.get_e_type();
1568 if (et
== elfcpp::ET_REL
)
1570 Sized_relobj
<size
, big_endian
>* obj
=
1571 new Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
1575 else if (et
== elfcpp::ET_DYN
)
1577 Sized_dynobj
<size
, big_endian
>* obj
=
1578 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
1584 gold_error(_("%s: unsupported ELF file type %d"),
1590 } // End anonymous namespace.
1595 // Read an ELF file and return the appropriate instance of Object.
1598 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1599 const unsigned char* p
, section_offset_type bytes
)
1601 if (bytes
< elfcpp::EI_NIDENT
)
1603 gold_error(_("%s: ELF file too short"), name
.c_str());
1607 int v
= p
[elfcpp::EI_VERSION
];
1608 if (v
!= elfcpp::EV_CURRENT
)
1610 if (v
== elfcpp::EV_NONE
)
1611 gold_error(_("%s: invalid ELF version 0"), name
.c_str());
1613 gold_error(_("%s: unsupported ELF version %d"), name
.c_str(), v
);
1617 int c
= p
[elfcpp::EI_CLASS
];
1618 if (c
== elfcpp::ELFCLASSNONE
)
1620 gold_error(_("%s: invalid ELF class 0"), name
.c_str());
1623 else if (c
!= elfcpp::ELFCLASS32
1624 && c
!= elfcpp::ELFCLASS64
)
1626 gold_error(_("%s: unsupported ELF class %d"), name
.c_str(), c
);
1630 int d
= p
[elfcpp::EI_DATA
];
1631 if (d
== elfcpp::ELFDATANONE
)
1633 gold_error(_("%s: invalid ELF data encoding"), name
.c_str());
1636 else if (d
!= elfcpp::ELFDATA2LSB
1637 && d
!= elfcpp::ELFDATA2MSB
)
1639 gold_error(_("%s: unsupported ELF data encoding %d"), name
.c_str(), d
);
1643 bool big_endian
= d
== elfcpp::ELFDATA2MSB
;
1645 if (c
== elfcpp::ELFCLASS32
)
1647 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
1649 gold_error(_("%s: ELF file too short"), name
.c_str());
1654 #ifdef HAVE_TARGET_32_BIG
1655 elfcpp::Ehdr
<32, true> ehdr(p
);
1656 return make_elf_sized_object
<32, true>(name
, input_file
,
1659 gold_error(_("%s: not configured to support "
1660 "32-bit big-endian object"),
1667 #ifdef HAVE_TARGET_32_LITTLE
1668 elfcpp::Ehdr
<32, false> ehdr(p
);
1669 return make_elf_sized_object
<32, false>(name
, input_file
,
1672 gold_error(_("%s: not configured to support "
1673 "32-bit little-endian object"),
1681 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
1683 gold_error(_("%s: ELF file too short"), name
.c_str());
1688 #ifdef HAVE_TARGET_64_BIG
1689 elfcpp::Ehdr
<64, true> ehdr(p
);
1690 return make_elf_sized_object
<64, true>(name
, input_file
,
1693 gold_error(_("%s: not configured to support "
1694 "64-bit big-endian object"),
1701 #ifdef HAVE_TARGET_64_LITTLE
1702 elfcpp::Ehdr
<64, false> ehdr(p
);
1703 return make_elf_sized_object
<64, false>(name
, input_file
,
1706 gold_error(_("%s: not configured to support "
1707 "64-bit little-endian object"),
1715 // Instantiate the templates we need.
1717 #ifdef HAVE_TARGET_32_LITTLE
1720 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
1721 Read_symbols_data
*);
1724 #ifdef HAVE_TARGET_32_BIG
1727 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
1728 Read_symbols_data
*);
1731 #ifdef HAVE_TARGET_64_LITTLE
1734 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
1735 Read_symbols_data
*);
1738 #ifdef HAVE_TARGET_64_BIG
1741 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
1742 Read_symbols_data
*);
1745 #ifdef HAVE_TARGET_32_LITTLE
1747 class Sized_relobj
<32, false>;
1750 #ifdef HAVE_TARGET_32_BIG
1752 class Sized_relobj
<32, true>;
1755 #ifdef HAVE_TARGET_64_LITTLE
1757 class Sized_relobj
<64, false>;
1760 #ifdef HAVE_TARGET_64_BIG
1762 class Sized_relobj
<64, true>;
1765 #ifdef HAVE_TARGET_32_LITTLE
1767 struct Relocate_info
<32, false>;
1770 #ifdef HAVE_TARGET_32_BIG
1772 struct Relocate_info
<32, true>;
1775 #ifdef HAVE_TARGET_64_LITTLE
1777 struct Relocate_info
<64, false>;
1780 #ifdef HAVE_TARGET_64_BIG
1782 struct Relocate_info
<64, true>;
1785 } // End namespace gold.