1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007 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 "target-select.h"
41 // Set the target based on fields in the ELF file header.
44 Object::set_target(int machine
, int size
, bool big_endian
, int osabi
,
47 Target
* target
= select_target(machine
, size
, big_endian
, osabi
, abiversion
);
49 gold_fatal(_("%s: unsupported ELF machine number %d"),
50 this->name().c_str(), machine
);
51 this->target_
= target
;
54 // Report an error for this object file. This is used by the
55 // elfcpp::Elf_file interface, and also called by the Object code
59 Object::error(const char* format
, ...) const
62 va_start(args
, format
);
64 if (vasprintf(&buf
, format
, args
) < 0)
67 gold_error(_("%s: %s"), this->name().c_str(), buf
);
71 // Return a view of the contents of a section.
74 Object::section_contents(unsigned int shndx
, off_t
* plen
, bool cache
)
76 Location
loc(this->do_section_contents(shndx
));
77 *plen
= loc
.data_size
;
78 return this->get_view(loc
.file_offset
, loc
.data_size
, cache
);
81 // Read the section data into SD. This is code common to Sized_relobj
82 // and Sized_dynobj, so we put it into Object.
84 template<int size
, bool big_endian
>
86 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
87 Read_symbols_data
* sd
)
89 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
91 // Read the section headers.
92 const off_t shoff
= elf_file
->shoff();
93 const unsigned int shnum
= this->shnum();
94 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
, true);
96 // Read the section names.
97 const unsigned char* pshdrs
= sd
->section_headers
->data();
98 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
99 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
101 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
102 this->error(_("section name section has wrong type: %u"),
103 static_cast<unsigned int>(shdrnames
.get_sh_type()));
105 sd
->section_names_size
= shdrnames
.get_sh_size();
106 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
107 sd
->section_names_size
, false);
110 // If NAME is the name of a special .gnu.warning section, arrange for
111 // the warning to be issued. SHNDX is the section index. Return
112 // whether it is a warning section.
115 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
116 Symbol_table
* symtab
)
118 const char warn_prefix
[] = ".gnu.warning.";
119 const int warn_prefix_len
= sizeof warn_prefix
- 1;
120 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
122 symtab
->add_warning(name
+ warn_prefix_len
, this, shndx
);
128 // Class Sized_relobj.
130 template<int size
, bool big_endian
>
131 Sized_relobj
<size
, big_endian
>::Sized_relobj(
132 const std::string
& name
,
133 Input_file
* input_file
,
135 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
136 : Relobj(name
, input_file
, offset
),
137 elf_file_(this, ehdr
),
139 local_symbol_count_(0),
140 output_local_symbol_count_(0),
142 local_symbol_offset_(0),
148 template<int size
, bool big_endian
>
149 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
153 // Set up an object file based on the file header. This sets up the
154 // target and reads the section information.
156 template<int size
, bool big_endian
>
158 Sized_relobj
<size
, big_endian
>::setup(
159 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
161 this->set_target(ehdr
.get_e_machine(), size
, big_endian
,
162 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
163 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
165 const unsigned int shnum
= this->elf_file_
.shnum();
166 this->set_shnum(shnum
);
169 // Find the SHT_SYMTAB section, given the section headers. The ELF
170 // standard says that maybe in the future there can be more than one
171 // SHT_SYMTAB section. Until somebody figures out how that could
172 // work, we assume there is only one.
174 template<int size
, bool big_endian
>
176 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
178 const unsigned int shnum
= this->shnum();
179 this->symtab_shndx_
= 0;
182 // Look through the sections in reverse order, since gas tends
183 // to put the symbol table at the end.
184 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
185 unsigned int i
= shnum
;
189 p
-= This::shdr_size
;
190 typename
This::Shdr
shdr(p
);
191 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
193 this->symtab_shndx_
= i
;
200 // Read the sections and symbols from an object file.
202 template<int size
, bool big_endian
>
204 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
206 this->read_section_data(&this->elf_file_
, sd
);
208 const unsigned char* const pshdrs
= sd
->section_headers
->data();
210 this->find_symtab(pshdrs
);
213 sd
->symbols_size
= 0;
214 sd
->symbol_names
= NULL
;
215 sd
->symbol_names_size
= 0;
217 if (this->symtab_shndx_
== 0)
219 // No symbol table. Weird but legal.
223 // Get the symbol table section header.
224 typename
This::Shdr
symtabshdr(pshdrs
225 + this->symtab_shndx_
* This::shdr_size
);
226 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
228 // We only need the external symbols.
229 const int sym_size
= This::sym_size
;
230 const unsigned int loccount
= symtabshdr
.get_sh_info();
231 this->local_symbol_count_
= loccount
;
232 off_t locsize
= loccount
* sym_size
;
233 off_t extoff
= symtabshdr
.get_sh_offset() + locsize
;
234 off_t extsize
= symtabshdr
.get_sh_size() - locsize
;
236 // Read the symbol table.
237 File_view
* fvsymtab
= this->get_lasting_view(extoff
, extsize
, false);
239 // Read the section header for the symbol names.
240 unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
241 if (strtab_shndx
>= this->shnum())
243 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
246 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
247 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
249 this->error(_("symbol table name section has wrong type: %u"),
250 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
254 // Read the symbol names.
255 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
256 strtabshdr
.get_sh_size(), true);
258 sd
->symbols
= fvsymtab
;
259 sd
->symbols_size
= extsize
;
260 sd
->symbol_names
= fvstrtab
;
261 sd
->symbol_names_size
= strtabshdr
.get_sh_size();
264 // Return whether to include a section group in the link. LAYOUT is
265 // used to keep track of which section groups we have already seen.
266 // INDEX is the index of the section group and SHDR is the section
267 // header. If we do not want to include this group, we set bits in
268 // OMIT for each section which should be discarded.
270 template<int size
, bool big_endian
>
272 Sized_relobj
<size
, big_endian
>::include_section_group(
275 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
276 std::vector
<bool>* omit
)
278 // Read the section contents.
279 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
280 shdr
.get_sh_size(), false);
281 const elfcpp::Elf_Word
* pword
=
282 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
284 // The first word contains flags. We only care about COMDAT section
285 // groups. Other section groups are always included in the link
286 // just like ordinary sections.
287 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
288 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
291 // Look up the group signature, which is the name of a symbol. This
292 // is a lot of effort to go to to read a string. Why didn't they
293 // just use the name of the SHT_GROUP section as the group
296 // Get the appropriate symbol table header (this will normally be
297 // the single SHT_SYMTAB section, but in principle it need not be).
298 const unsigned int link
= shdr
.get_sh_link();
299 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
301 // Read the symbol table entry.
302 if (shdr
.get_sh_info() >= symshdr
.get_sh_size() / This::sym_size
)
304 this->error(_("section group %u info %u out of range"),
305 index
, shdr
.get_sh_info());
308 off_t symoff
= symshdr
.get_sh_offset() + shdr
.get_sh_info() * This::sym_size
;
309 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true);
310 elfcpp::Sym
<size
, big_endian
> sym(psym
);
312 // Read the symbol table names.
314 const unsigned char* psymnamesu
;
315 psymnamesu
= this->section_contents(symshdr
.get_sh_link(), &symnamelen
,
317 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
319 // Get the section group signature.
320 if (sym
.get_st_name() >= symnamelen
)
322 this->error(_("symbol %u name offset %u out of range"),
323 shdr
.get_sh_info(), sym
.get_st_name());
327 const char* signature
= psymnames
+ sym
.get_st_name();
329 // It seems that some versions of gas will create a section group
330 // associated with a section symbol, and then fail to give a name to
331 // the section symbol. In such a case, use the name of the section.
334 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
336 secname
= this->section_name(sym
.get_st_shndx());
337 signature
= secname
.c_str();
340 // Record this section group, and see whether we've already seen one
341 // with the same signature.
342 if (layout
->add_comdat(signature
, true))
345 // This is a duplicate. We want to discard the sections in this
347 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
348 for (size_t i
= 1; i
< count
; ++i
)
350 elfcpp::Elf_Word secnum
=
351 elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
);
352 if (secnum
>= this->shnum())
354 this->error(_("section %u in section group %u out of range"),
358 (*omit
)[secnum
] = true;
364 // Whether to include a linkonce section in the link. NAME is the
365 // name of the section and SHDR is the section header.
367 // Linkonce sections are a GNU extension implemented in the original
368 // GNU linker before section groups were defined. The semantics are
369 // that we only include one linkonce section with a given name. The
370 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
371 // where T is the type of section and SYMNAME is the name of a symbol.
372 // In an attempt to make linkonce sections interact well with section
373 // groups, we try to identify SYMNAME and use it like a section group
374 // signature. We want to block section groups with that signature,
375 // but not other linkonce sections with that signature. We also use
376 // the full name of the linkonce section as a normal section group
379 template<int size
, bool big_endian
>
381 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
384 const elfcpp::Shdr
<size
, big_endian
>&)
386 // In general the symbol name we want will be the string following
387 // the last '.'. However, we have to handle the case of
388 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
389 // some versions of gcc. So we use a heuristic: if the name starts
390 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
391 // we look for the last '.'. We can't always simply skip
392 // ".gnu.linkonce.X", because we have to deal with cases like
393 // ".gnu.linkonce.d.rel.ro.local".
394 const char* const linkonce_t
= ".gnu.linkonce.t.";
396 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
397 symname
= name
+ strlen(linkonce_t
);
399 symname
= strrchr(name
, '.') + 1;
400 bool include1
= layout
->add_comdat(symname
, false);
401 bool include2
= layout
->add_comdat(name
, true);
402 return include1
&& include2
;
405 // Lay out the input sections. We walk through the sections and check
406 // whether they should be included in the link. If they should, we
407 // pass them to the Layout object, which will return an output section
410 template<int size
, bool big_endian
>
412 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
414 Read_symbols_data
* sd
)
416 const unsigned int shnum
= this->shnum();
420 // Get the section headers.
421 const unsigned char* pshdrs
= sd
->section_headers
->data();
423 // Get the section names.
424 const unsigned char* pnamesu
= sd
->section_names
->data();
425 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
427 std::vector
<Map_to_output
>& map_sections(this->map_to_output());
428 map_sections
.resize(shnum
);
430 // Whether we've seen a .note.GNU-stack section.
431 bool seen_gnu_stack
= false;
432 // The flags of a .note.GNU-stack section.
433 uint64_t gnu_stack_flags
= 0;
435 // Keep track of which sections to omit.
436 std::vector
<bool> omit(shnum
, false);
438 // Skip the first, dummy, section.
439 pshdrs
+= This::shdr_size
;
440 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
442 typename
This::Shdr
shdr(pshdrs
);
444 if (shdr
.get_sh_name() >= sd
->section_names_size
)
446 this->error(_("bad section name offset for section %u: %lu"),
447 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
451 const char* name
= pnames
+ shdr
.get_sh_name();
453 if (this->handle_gnu_warning_section(name
, i
, symtab
))
455 if (!parameters
->output_is_object())
459 // The .note.GNU-stack section is special. It gives the
460 // protection flags that this object file requires for the stack
462 if (strcmp(name
, ".note.GNU-stack") == 0)
464 seen_gnu_stack
= true;
465 gnu_stack_flags
|= shdr
.get_sh_flags();
469 bool discard
= omit
[i
];
472 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
474 if (!this->include_section_group(layout
, i
, shdr
, &omit
))
477 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
478 && Layout::is_linkonce(name
))
480 if (!this->include_linkonce_section(layout
, name
, shdr
))
487 // Do not include this section in the link.
488 map_sections
[i
].output_section
= NULL
;
493 Output_section
* os
= layout
->layout(this, i
, name
, shdr
, &offset
);
495 map_sections
[i
].output_section
= os
;
496 map_sections
[i
].offset
= offset
;
499 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
);
501 delete sd
->section_headers
;
502 sd
->section_headers
= NULL
;
503 delete sd
->section_names
;
504 sd
->section_names
= NULL
;
507 // Add the symbols to the symbol table.
509 template<int size
, bool big_endian
>
511 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
512 Read_symbols_data
* sd
)
514 if (sd
->symbols
== NULL
)
516 gold_assert(sd
->symbol_names
== NULL
);
520 const int sym_size
= This::sym_size
;
521 size_t symcount
= sd
->symbols_size
/ sym_size
;
522 if (static_cast<off_t
>(symcount
* sym_size
) != sd
->symbols_size
)
524 this->error(_("size of symbols is not multiple of symbol size"));
528 this->symbols_
= new Symbol
*[symcount
];
530 const char* sym_names
=
531 reinterpret_cast<const char*>(sd
->symbol_names
->data());
532 symtab
->add_from_relobj(this, sd
->symbols
->data(), symcount
, sym_names
,
533 sd
->symbol_names_size
, this->symbols_
);
537 delete sd
->symbol_names
;
538 sd
->symbol_names
= NULL
;
541 // Finalize the local symbols. Here we record the file offset at
542 // which they should be output, we add their names to *POOL, and we
543 // add their values to THIS->LOCAL_VALUES_. Return the symbol index.
544 // This function is always called from the main thread. The actual
545 // output of the local symbols will occur in a separate task.
547 template<int size
, bool big_endian
>
549 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
553 gold_assert(this->symtab_shndx_
!= -1U);
554 if (this->symtab_shndx_
== 0)
556 // This object has no symbols. Weird but legal.
560 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
562 this->local_symbol_offset_
= off
;
564 // Read the symbol table section header.
565 const unsigned int symtab_shndx
= this->symtab_shndx_
;
566 typename
This::Shdr
symtabshdr(this,
567 this->elf_file_
.section_header(symtab_shndx
));
568 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
570 // Read the local symbols.
571 const int sym_size
= This::sym_size
;
572 const unsigned int loccount
= this->local_symbol_count_
;
573 gold_assert(loccount
== symtabshdr
.get_sh_info());
574 off_t locsize
= loccount
* sym_size
;
575 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
578 this->local_values_
.resize(loccount
);
580 // Read the symbol names.
581 const unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
583 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
586 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
588 // Loop over the local symbols.
590 const std::vector
<Map_to_output
>& mo(this->map_to_output());
591 unsigned int shnum
= this->shnum();
592 unsigned int count
= 0;
593 // Skip the first, dummy, symbol.
595 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
597 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
599 Symbol_value
<size
>& lv(this->local_values_
[i
]);
601 unsigned int shndx
= sym
.get_st_shndx();
602 lv
.set_input_shndx(shndx
);
604 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
605 lv
.set_is_section_symbol();
607 if (shndx
>= elfcpp::SHN_LORESERVE
)
609 if (shndx
== elfcpp::SHN_ABS
)
610 lv
.set_output_value(sym
.get_st_value());
613 // FIXME: Handle SHN_XINDEX.
614 this->error(_("unknown section index %u for local symbol %u"),
616 lv
.set_output_value(0);
623 this->error(_("local symbol %u section index %u out of range"),
628 Output_section
* os
= mo
[shndx
].output_section
;
632 lv
.set_output_value(0);
633 lv
.set_no_output_symtab_entry();
637 if (mo
[shndx
].offset
== -1)
638 lv
.set_input_value(sym
.get_st_value());
640 lv
.set_output_value(mo
[shndx
].output_section
->address()
642 + sym
.get_st_value());
645 // Decide whether this symbol should go into the output file.
647 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
649 lv
.set_no_output_symtab_entry();
653 if (sym
.get_st_name() >= strtab_size
)
655 this->error(_("local symbol %u section name out of range: %u >= %u"),
656 i
, sym
.get_st_name(),
657 static_cast<unsigned int>(strtab_size
));
658 lv
.set_no_output_symtab_entry();
662 const char* name
= pnames
+ sym
.get_st_name();
663 pool
->add(name
, true, NULL
);
664 lv
.set_output_symtab_index(index
);
669 this->output_local_symbol_count_
= count
;
674 // Return the value of the local symbol symndx.
675 template<int size
, bool big_endian
>
676 typename
elfcpp::Elf_types
<size
>::Elf_Addr
677 Sized_relobj
<size
, big_endian
>::local_symbol_value(unsigned int symndx
) const
679 gold_assert(symndx
< this->local_symbol_count_
);
680 gold_assert(symndx
< this->local_values_
.size());
681 const Symbol_value
<size
>& lv(this->local_values_
[symndx
]);
682 return lv
.value(this, 0);
685 // Return the value of a local symbol defined in input section SHNDX,
686 // with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
687 // indicates whether the symbol is a section symbol. This handles
688 // SHF_MERGE sections.
689 template<int size
, bool big_endian
>
690 typename
elfcpp::Elf_types
<size
>::Elf_Addr
691 Sized_relobj
<size
, big_endian
>::local_value(unsigned int shndx
,
693 bool is_section_symbol
,
694 Address addend
) const
696 const std::vector
<Map_to_output
>& mo(this->map_to_output());
697 Output_section
* os
= mo
[shndx
].output_section
;
700 gold_assert(mo
[shndx
].offset
== -1);
702 // Do the mapping required by the output section. If this is not a
703 // section symbol, then we want to map the symbol value, and then
704 // include the addend. If this is a section symbol, then we need to
705 // include the addend to figure out where in the section we are,
706 // before we do the mapping. This will do the right thing provided
707 // the assembler is careful to only convert a relocation in a merged
708 // section to a section symbol if there is a zero addend. If the
709 // assembler does not do this, then in general we can't know what to
710 // do, because we can't distinguish the addend for the instruction
711 // format from the addend for the section offset.
713 if (is_section_symbol
)
714 return os
->output_address(this, shndx
, value
+ addend
);
716 return addend
+ os
->output_address(this, shndx
, value
);
719 // Write out the local symbols.
721 template<int size
, bool big_endian
>
723 Sized_relobj
<size
, big_endian
>::write_local_symbols(Output_file
* of
,
724 const Stringpool
* sympool
)
726 if (parameters
->strip_all())
729 gold_assert(this->symtab_shndx_
!= -1U);
730 if (this->symtab_shndx_
== 0)
732 // This object has no symbols. Weird but legal.
736 // Read the symbol table section header.
737 const unsigned int symtab_shndx
= this->symtab_shndx_
;
738 typename
This::Shdr
symtabshdr(this,
739 this->elf_file_
.section_header(symtab_shndx
));
740 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
741 const unsigned int loccount
= this->local_symbol_count_
;
742 gold_assert(loccount
== symtabshdr
.get_sh_info());
744 // Read the local symbols.
745 const int sym_size
= This::sym_size
;
746 off_t locsize
= loccount
* sym_size
;
747 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
750 // Read the symbol names.
751 const unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
753 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
756 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
758 // Get a view into the output file.
759 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
760 unsigned char* oview
= of
->get_output_view(this->local_symbol_offset_
,
763 const std::vector
<Map_to_output
>& mo(this->map_to_output());
765 gold_assert(this->local_values_
.size() == loccount
);
767 unsigned char* ov
= oview
;
769 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
771 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
773 if (!this->local_values_
[i
].needs_output_symtab_entry())
776 unsigned int st_shndx
= isym
.get_st_shndx();
777 if (st_shndx
< elfcpp::SHN_LORESERVE
)
779 gold_assert(st_shndx
< mo
.size());
780 if (mo
[st_shndx
].output_section
== NULL
)
782 st_shndx
= mo
[st_shndx
].output_section
->out_shndx();
785 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
787 gold_assert(isym
.get_st_name() < strtab_size
);
788 const char* name
= pnames
+ isym
.get_st_name();
789 osym
.put_st_name(sympool
->get_offset(name
));
790 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
791 osym
.put_st_size(isym
.get_st_size());
792 osym
.put_st_info(isym
.get_st_info());
793 osym
.put_st_other(isym
.get_st_other());
794 osym
.put_st_shndx(st_shndx
);
799 gold_assert(ov
- oview
== output_size
);
801 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
804 // Input_objects methods.
806 // Add a regular relocatable object to the list. Return false if this
807 // object should be ignored.
810 Input_objects::add_object(Object
* obj
)
812 if (!obj
->is_dynamic())
813 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
816 // See if this is a duplicate SONAME.
817 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
819 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
820 this->sonames_
.insert(dynobj
->soname());
823 // We have already seen a dynamic object with this soname.
827 this->dynobj_list_
.push_back(dynobj
);
830 Target
* target
= obj
->target();
831 if (this->target_
== NULL
)
832 this->target_
= target
;
833 else if (this->target_
!= target
)
835 gold_error(_("%s: incompatible target"), obj
->name().c_str());
839 set_parameters_size_and_endianness(target
->get_size(),
840 target
->is_big_endian());
845 // Relocate_info methods.
847 // Return a string describing the location of a relocation. This is
848 // only used in error messages.
850 template<int size
, bool big_endian
>
852 Relocate_info
<size
, big_endian
>::location(size_t relnum
, off_t
) const
854 std::string
ret(this->object
->name());
857 snprintf(buf
, sizeof buf
, "%zu", relnum
);
859 ret
+= " in reloc section ";
860 snprintf(buf
, sizeof buf
, "%u", this->reloc_shndx
);
862 ret
+= " (" + this->object
->section_name(this->reloc_shndx
);
863 ret
+= ") for section ";
864 snprintf(buf
, sizeof buf
, "%u", this->data_shndx
);
866 ret
+= " (" + this->object
->section_name(this->data_shndx
) + ")";
870 } // End namespace gold.
875 using namespace gold
;
877 // Read an ELF file with the header and return the appropriate
878 // instance of Object.
880 template<int size
, bool big_endian
>
882 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
883 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
885 int et
= ehdr
.get_e_type();
886 if (et
== elfcpp::ET_REL
)
888 Sized_relobj
<size
, big_endian
>* obj
=
889 new Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
893 else if (et
== elfcpp::ET_DYN
)
895 Sized_dynobj
<size
, big_endian
>* obj
=
896 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
902 gold_error(_("%s: unsupported ELF file type %d"),
908 } // End anonymous namespace.
913 // Read an ELF file and return the appropriate instance of Object.
916 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
917 const unsigned char* p
, off_t bytes
)
919 if (bytes
< elfcpp::EI_NIDENT
)
921 gold_error(_("%s: ELF file too short"), name
.c_str());
925 int v
= p
[elfcpp::EI_VERSION
];
926 if (v
!= elfcpp::EV_CURRENT
)
928 if (v
== elfcpp::EV_NONE
)
929 gold_error(_("%s: invalid ELF version 0"), name
.c_str());
931 gold_error(_("%s: unsupported ELF version %d"), name
.c_str(), v
);
935 int c
= p
[elfcpp::EI_CLASS
];
936 if (c
== elfcpp::ELFCLASSNONE
)
938 gold_error(_("%s: invalid ELF class 0"), name
.c_str());
941 else if (c
!= elfcpp::ELFCLASS32
942 && c
!= elfcpp::ELFCLASS64
)
944 gold_error(_("%s: unsupported ELF class %d"), name
.c_str(), c
);
948 int d
= p
[elfcpp::EI_DATA
];
949 if (d
== elfcpp::ELFDATANONE
)
951 gold_error(_("%s: invalid ELF data encoding"), name
.c_str());
954 else if (d
!= elfcpp::ELFDATA2LSB
955 && d
!= elfcpp::ELFDATA2MSB
)
957 gold_error(_("%s: unsupported ELF data encoding %d"), name
.c_str(), d
);
961 bool big_endian
= d
== elfcpp::ELFDATA2MSB
;
963 if (c
== elfcpp::ELFCLASS32
)
965 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
967 gold_error(_("%s: ELF file too short"), name
.c_str());
972 #ifdef HAVE_TARGET_32_BIG
973 elfcpp::Ehdr
<32, true> ehdr(p
);
974 return make_elf_sized_object
<32, true>(name
, input_file
,
977 gold_error(_("%s: not configured to support "
978 "32-bit big-endian object"),
985 #ifdef HAVE_TARGET_32_LITTLE
986 elfcpp::Ehdr
<32, false> ehdr(p
);
987 return make_elf_sized_object
<32, false>(name
, input_file
,
990 gold_error(_("%s: not configured to support "
991 "32-bit little-endian object"),
999 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
1001 gold_error(_("%s: ELF file too short"), name
.c_str());
1006 #ifdef HAVE_TARGET_64_BIG
1007 elfcpp::Ehdr
<64, true> ehdr(p
);
1008 return make_elf_sized_object
<64, true>(name
, input_file
,
1011 gold_error(_("%s: not configured to support "
1012 "64-bit big-endian object"),
1019 #ifdef HAVE_TARGET_64_LITTLE
1020 elfcpp::Ehdr
<64, false> ehdr(p
);
1021 return make_elf_sized_object
<64, false>(name
, input_file
,
1024 gold_error(_("%s: not configured to support "
1025 "64-bit little-endian object"),
1033 // Instantiate the templates we need. We could use the configure
1034 // script to restrict this to only the ones for implemented targets.
1036 #ifdef HAVE_TARGET_32_LITTLE
1038 class Sized_relobj
<32, false>;
1041 #ifdef HAVE_TARGET_32_BIG
1043 class Sized_relobj
<32, true>;
1046 #ifdef HAVE_TARGET_64_LITTLE
1048 class Sized_relobj
<64, false>;
1051 #ifdef HAVE_TARGET_64_BIG
1053 class Sized_relobj
<64, true>;
1056 #ifdef HAVE_TARGET_32_LITTLE
1058 struct Relocate_info
<32, false>;
1061 #ifdef HAVE_TARGET_32_BIG
1063 struct Relocate_info
<32, true>;
1066 #ifdef HAVE_TARGET_64_LITTLE
1068 struct Relocate_info
<64, false>;
1071 #ifdef HAVE_TARGET_64_BIG
1073 struct Relocate_info
<64, true>;
1076 } // End namespace gold.