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
);
50 fprintf(stderr
, _("%s: %s: unsupported ELF machine number %d\n"),
51 program_name
, this->name().c_str(), machine
);
54 this->target_
= target
;
57 // Report an error for the elfcpp::Elf_file interface.
60 Object::error(const char* format
, ...)
64 fprintf(stderr
, "%s: %s: ", program_name
, this->name().c_str());
65 va_start(args
, format
);
66 vfprintf(stderr
, format
, args
);
73 // Return a view of the contents of a section.
76 Object::section_contents(unsigned int shndx
, off_t
* plen
, bool cache
)
78 Location
loc(this->do_section_contents(shndx
));
79 *plen
= loc
.data_size
;
80 return this->get_view(loc
.file_offset
, loc
.data_size
, cache
);
83 // Read the section data into SD. This is code common to Sized_relobj
84 // and Sized_dynobj, so we put it into Object.
86 template<int size
, bool big_endian
>
88 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
89 Read_symbols_data
* sd
)
91 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
93 // Read the section headers.
94 const off_t shoff
= elf_file
->shoff();
95 const unsigned int shnum
= this->shnum();
96 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
, true);
98 // Read the section names.
99 const unsigned char* pshdrs
= sd
->section_headers
->data();
100 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
101 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
103 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
106 _("%s: %s: section name section has wrong type: %u\n"),
107 program_name
, this->name().c_str(),
108 static_cast<unsigned int>(shdrnames
.get_sh_type()));
112 sd
->section_names_size
= shdrnames
.get_sh_size();
113 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
114 sd
->section_names_size
, false);
117 // If NAME is the name of a special .gnu.warning section, arrange for
118 // the warning to be issued. SHNDX is the section index. Return
119 // whether it is a warning section.
122 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
123 Symbol_table
* symtab
)
125 const char warn_prefix
[] = ".gnu.warning.";
126 const int warn_prefix_len
= sizeof warn_prefix
- 1;
127 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
129 symtab
->add_warning(name
+ warn_prefix_len
, this, shndx
);
135 // Class Sized_relobj.
137 template<int size
, bool big_endian
>
138 Sized_relobj
<size
, big_endian
>::Sized_relobj(
139 const std::string
& name
,
140 Input_file
* input_file
,
142 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
143 : Relobj(name
, input_file
, offset
),
144 elf_file_(this, ehdr
),
146 local_symbol_count_(0),
147 output_local_symbol_count_(0),
149 local_symbol_offset_(0),
155 template<int size
, bool big_endian
>
156 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
160 // Set up an object file based on the file header. This sets up the
161 // target and reads the section information.
163 template<int size
, bool big_endian
>
165 Sized_relobj
<size
, big_endian
>::setup(
166 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
168 this->set_target(ehdr
.get_e_machine(), size
, big_endian
,
169 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
170 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
172 const unsigned int shnum
= this->elf_file_
.shnum();
173 this->set_shnum(shnum
);
176 // Find the SHT_SYMTAB section, given the section headers. The ELF
177 // standard says that maybe in the future there can be more than one
178 // SHT_SYMTAB section. Until somebody figures out how that could
179 // work, we assume there is only one.
181 template<int size
, bool big_endian
>
183 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
185 const unsigned int shnum
= this->shnum();
186 this->symtab_shndx_
= 0;
189 // Look through the sections in reverse order, since gas tends
190 // to put the symbol table at the end.
191 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
192 unsigned int i
= shnum
;
196 p
-= This::shdr_size
;
197 typename
This::Shdr
shdr(p
);
198 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
200 this->symtab_shndx_
= i
;
207 // Read the sections and symbols from an object file.
209 template<int size
, bool big_endian
>
211 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
213 this->read_section_data(&this->elf_file_
, sd
);
215 const unsigned char* const pshdrs
= sd
->section_headers
->data();
217 this->find_symtab(pshdrs
);
219 if (this->symtab_shndx_
== 0)
221 // No symbol table. Weird but legal.
223 sd
->symbols_size
= 0;
224 sd
->symbol_names
= NULL
;
225 sd
->symbol_names_size
= 0;
229 // Get the symbol table section header.
230 typename
This::Shdr
symtabshdr(pshdrs
231 + this->symtab_shndx_
* This::shdr_size
);
232 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
234 // We only need the external symbols.
235 const int sym_size
= This::sym_size
;
236 const unsigned int loccount
= symtabshdr
.get_sh_info();
237 this->local_symbol_count_
= loccount
;
238 off_t locsize
= loccount
* sym_size
;
239 off_t extoff
= symtabshdr
.get_sh_offset() + locsize
;
240 off_t extsize
= symtabshdr
.get_sh_size() - locsize
;
242 // Read the symbol table.
243 File_view
* fvsymtab
= this->get_lasting_view(extoff
, extsize
, false);
245 // Read the section header for the symbol names.
246 unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
247 if (strtab_shndx
>= this->shnum())
249 fprintf(stderr
, _("%s: %s: invalid symbol table name index: %u\n"),
250 program_name
, this->name().c_str(), strtab_shndx
);
253 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
254 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
257 _("%s: %s: symbol table name section has wrong type: %u\n"),
258 program_name
, this->name().c_str(),
259 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
263 // Read the symbol names.
264 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
265 strtabshdr
.get_sh_size(), true);
267 sd
->symbols
= fvsymtab
;
268 sd
->symbols_size
= extsize
;
269 sd
->symbol_names
= fvstrtab
;
270 sd
->symbol_names_size
= strtabshdr
.get_sh_size();
273 // Return whether to include a section group in the link. LAYOUT is
274 // used to keep track of which section groups we have already seen.
275 // INDEX is the index of the section group and SHDR is the section
276 // header. If we do not want to include this group, we set bits in
277 // OMIT for each section which should be discarded.
279 template<int size
, bool big_endian
>
281 Sized_relobj
<size
, big_endian
>::include_section_group(
284 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
285 std::vector
<bool>* omit
)
287 // Read the section contents.
288 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
289 shdr
.get_sh_size(), false);
290 const elfcpp::Elf_Word
* pword
=
291 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
293 // The first word contains flags. We only care about COMDAT section
294 // groups. Other section groups are always included in the link
295 // just like ordinary sections.
296 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
297 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
300 // Look up the group signature, which is the name of a symbol. This
301 // is a lot of effort to go to to read a string. Why didn't they
302 // just use the name of the SHT_GROUP section as the group
305 // Get the appropriate symbol table header (this will normally be
306 // the single SHT_SYMTAB section, but in principle it need not be).
307 const unsigned int link
= shdr
.get_sh_link();
308 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
310 // Read the symbol table entry.
311 if (shdr
.get_sh_info() >= symshdr
.get_sh_size() / This::sym_size
)
313 fprintf(stderr
, _("%s: %s: section group %u info %u out of range\n"),
314 program_name
, this->name().c_str(), index
, shdr
.get_sh_info());
317 off_t symoff
= symshdr
.get_sh_offset() + shdr
.get_sh_info() * This::sym_size
;
318 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true);
319 elfcpp::Sym
<size
, big_endian
> sym(psym
);
321 // Read the symbol table names.
323 const unsigned char* psymnamesu
;
324 psymnamesu
= this->section_contents(symshdr
.get_sh_link(), &symnamelen
,
326 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
328 // Get the section group signature.
329 if (sym
.get_st_name() >= symnamelen
)
331 fprintf(stderr
, _("%s: %s: symbol %u name offset %u out of range\n"),
332 program_name
, this->name().c_str(), shdr
.get_sh_info(),
337 const char* signature
= psymnames
+ sym
.get_st_name();
339 // It seems that some versions of gas will create a section group
340 // associated with a section symbol, and then fail to give a name to
341 // the section symbol. In such a case, use the name of the section.
344 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
346 secname
= this->section_name(sym
.get_st_shndx());
347 signature
= secname
.c_str();
350 // Record this section group, and see whether we've already seen one
351 // with the same signature.
352 if (layout
->add_comdat(signature
, true))
355 // This is a duplicate. We want to discard the sections in this
357 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
358 for (size_t i
= 1; i
< count
; ++i
)
360 elfcpp::Elf_Word secnum
=
361 elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
);
362 if (secnum
>= this->shnum())
365 _("%s: %s: section %u in section group %u out of range"),
366 program_name
, this->name().c_str(), secnum
,
370 (*omit
)[secnum
] = true;
376 // Whether to include a linkonce section in the link. NAME is the
377 // name of the section and SHDR is the section header.
379 // Linkonce sections are a GNU extension implemented in the original
380 // GNU linker before section groups were defined. The semantics are
381 // that we only include one linkonce section with a given name. The
382 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
383 // where T is the type of section and SYMNAME is the name of a symbol.
384 // In an attempt to make linkonce sections interact well with section
385 // groups, we try to identify SYMNAME and use it like a section group
386 // signature. We want to block section groups with that signature,
387 // but not other linkonce sections with that signature. We also use
388 // the full name of the linkonce section as a normal section group
391 template<int size
, bool big_endian
>
393 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
396 const elfcpp::Shdr
<size
, big_endian
>&)
398 const char* symname
= strrchr(name
, '.') + 1;
399 bool include1
= layout
->add_comdat(symname
, false);
400 bool include2
= layout
->add_comdat(name
, true);
401 return include1
&& include2
;
404 // Lay out the input sections. We walk through the sections and check
405 // whether they should be included in the link. If they should, we
406 // pass them to the Layout object, which will return an output section
409 template<int size
, bool big_endian
>
411 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
413 Read_symbols_data
* sd
)
415 const unsigned int shnum
= this->shnum();
419 // Get the section headers.
420 const unsigned char* pshdrs
= sd
->section_headers
->data();
422 // Get the section names.
423 const unsigned char* pnamesu
= sd
->section_names
->data();
424 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
426 std::vector
<Map_to_output
>& map_sections(this->map_to_output());
427 map_sections
.resize(shnum
);
429 // Keep track of which sections to omit.
430 std::vector
<bool> omit(shnum
, false);
432 // Skip the first, dummy, section.
433 pshdrs
+= This::shdr_size
;
434 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
436 typename
This::Shdr
shdr(pshdrs
);
438 if (shdr
.get_sh_name() >= sd
->section_names_size
)
441 _("%s: %s: bad section name offset for section %u: %lu\n"),
442 program_name
, this->name().c_str(), i
,
443 static_cast<unsigned long>(shdr
.get_sh_name()));
447 const char* name
= pnames
+ shdr
.get_sh_name();
449 if (this->handle_gnu_warning_section(name
, i
, symtab
))
451 if (!parameters
->output_is_object())
455 bool discard
= omit
[i
];
458 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
460 if (!this->include_section_group(layout
, i
, shdr
, &omit
))
463 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
464 && Layout::is_linkonce(name
))
466 if (!this->include_linkonce_section(layout
, name
, shdr
))
473 // Do not include this section in the link.
474 map_sections
[i
].output_section
= NULL
;
479 Output_section
* os
= layout
->layout(this, i
, name
, shdr
, &offset
);
481 map_sections
[i
].output_section
= os
;
482 map_sections
[i
].offset
= offset
;
485 delete sd
->section_headers
;
486 sd
->section_headers
= NULL
;
487 delete sd
->section_names
;
488 sd
->section_names
= NULL
;
491 // Add the symbols to the symbol table.
493 template<int size
, bool big_endian
>
495 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
496 Read_symbols_data
* sd
)
498 if (sd
->symbols
== NULL
)
500 gold_assert(sd
->symbol_names
== NULL
);
504 const int sym_size
= This::sym_size
;
505 size_t symcount
= sd
->symbols_size
/ sym_size
;
506 if (static_cast<off_t
>(symcount
* sym_size
) != sd
->symbols_size
)
509 _("%s: %s: size of symbols is not multiple of symbol size\n"),
510 program_name
, this->name().c_str());
514 this->symbols_
= new Symbol
*[symcount
];
516 const char* sym_names
=
517 reinterpret_cast<const char*>(sd
->symbol_names
->data());
518 symtab
->add_from_relobj(this, sd
->symbols
->data(), symcount
, sym_names
,
519 sd
->symbol_names_size
, this->symbols_
);
523 delete sd
->symbol_names
;
524 sd
->symbol_names
= NULL
;
527 // Finalize the local symbols. Here we record the file offset at
528 // which they should be output, we add their names to *POOL, and we
529 // add their values to THIS->LOCAL_VALUES_. Return the symbol index.
530 // This function is always called from the main thread. The actual
531 // output of the local symbols will occur in a separate task.
533 template<int size
, bool big_endian
>
535 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
539 gold_assert(this->symtab_shndx_
!= -1U);
540 if (this->symtab_shndx_
== 0)
542 // This object has no symbols. Weird but legal.
546 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
548 this->local_symbol_offset_
= off
;
550 // Read the symbol table section header.
551 const unsigned int symtab_shndx
= this->symtab_shndx_
;
552 typename
This::Shdr
symtabshdr(this,
553 this->elf_file_
.section_header(symtab_shndx
));
554 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
556 // Read the local symbols.
557 const int sym_size
= This::sym_size
;
558 const unsigned int loccount
= this->local_symbol_count_
;
559 gold_assert(loccount
== symtabshdr
.get_sh_info());
560 off_t locsize
= loccount
* sym_size
;
561 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
564 this->local_values_
.resize(loccount
);
566 // Read the symbol names.
567 const unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
569 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
572 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
574 // Loop over the local symbols.
576 const std::vector
<Map_to_output
>& mo(this->map_to_output());
577 unsigned int shnum
= this->shnum();
578 unsigned int count
= 0;
579 // Skip the first, dummy, symbol.
581 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
583 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
585 Symbol_value
<size
>& lv(this->local_values_
[i
]);
587 unsigned int shndx
= sym
.get_st_shndx();
588 lv
.set_input_shndx(shndx
);
590 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
591 lv
.set_is_section_symbol();
593 if (shndx
>= elfcpp::SHN_LORESERVE
)
595 if (shndx
== elfcpp::SHN_ABS
)
596 lv
.set_output_value(sym
.get_st_value());
599 // FIXME: Handle SHN_XINDEX.
601 _("%s: %s: unknown section index %u "
602 "for local symbol %u\n"),
603 program_name
, this->name().c_str(), shndx
, i
);
612 _("%s: %s: local symbol %u section index %u "
614 program_name
, this->name().c_str(), i
, shndx
);
618 Output_section
* os
= mo
[shndx
].output_section
;
622 lv
.set_output_value(0);
623 lv
.set_no_output_symtab_entry();
627 if (mo
[shndx
].offset
== -1)
628 lv
.set_input_value(sym
.get_st_value());
630 lv
.set_output_value(mo
[shndx
].output_section
->address()
632 + sym
.get_st_value());
635 // Decide whether this symbol should go into the output file.
637 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
639 lv
.set_no_output_symtab_entry();
643 if (sym
.get_st_name() >= strtab_size
)
646 _("%s: %s: local symbol %u section name "
647 "out of range: %u >= %u\n"),
648 program_name
, this->name().c_str(),
649 i
, sym
.get_st_name(),
650 static_cast<unsigned int>(strtab_size
));
654 const char* name
= pnames
+ sym
.get_st_name();
655 pool
->add(name
, NULL
);
656 lv
.set_output_symtab_index(index
);
661 this->output_local_symbol_count_
= count
;
666 // Return the value of the local symbol symndx.
667 template<int size
, bool big_endian
>
668 typename
elfcpp::Elf_types
<size
>::Elf_Addr
669 Sized_relobj
<size
, big_endian
>::local_symbol_value(unsigned int symndx
) const
671 gold_assert(symndx
< this->local_symbol_count_
);
672 gold_assert(symndx
< this->local_values_
.size());
673 const Symbol_value
<size
>& lv(this->local_values_
[symndx
]);
674 return lv
.value(this, 0);
677 // Return the value of a local symbol defined in input section SHNDX,
678 // with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
679 // indicates whether the symbol is a section symbol. This handles
680 // SHF_MERGE sections.
681 template<int size
, bool big_endian
>
682 typename
elfcpp::Elf_types
<size
>::Elf_Addr
683 Sized_relobj
<size
, big_endian
>::local_value(unsigned int shndx
,
685 bool is_section_symbol
,
686 Address addend
) const
688 const std::vector
<Map_to_output
>& mo(this->map_to_output());
689 Output_section
* os
= mo
[shndx
].output_section
;
692 gold_assert(mo
[shndx
].offset
== -1);
694 // Do the mapping required by the output section. If this is not a
695 // section symbol, then we want to map the symbol value, and then
696 // include the addend. If this is a section symbol, then we need to
697 // include the addend to figure out where in the section we are,
698 // before we do the mapping. This will do the right thing provided
699 // the assembler is careful to only convert a relocation in a merged
700 // section to a section symbol if there is a zero addend. If the
701 // assembler does not do this, then in general we can't know what to
702 // do, because we can't distinguish the addend for the instruction
703 // format from the addend for the section offset.
705 if (is_section_symbol
)
706 return os
->output_address(this, shndx
, value
+ addend
);
708 return addend
+ os
->output_address(this, shndx
, value
);
711 // Write out the local symbols.
713 template<int size
, bool big_endian
>
715 Sized_relobj
<size
, big_endian
>::write_local_symbols(Output_file
* of
,
716 const Stringpool
* sympool
)
718 if (parameters
->strip_all())
721 gold_assert(this->symtab_shndx_
!= -1U);
722 if (this->symtab_shndx_
== 0)
724 // This object has no symbols. Weird but legal.
728 // Read the symbol table section header.
729 const unsigned int symtab_shndx
= this->symtab_shndx_
;
730 typename
This::Shdr
symtabshdr(this,
731 this->elf_file_
.section_header(symtab_shndx
));
732 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
733 const unsigned int loccount
= this->local_symbol_count_
;
734 gold_assert(loccount
== symtabshdr
.get_sh_info());
736 // Read the local symbols.
737 const int sym_size
= This::sym_size
;
738 off_t locsize
= loccount
* sym_size
;
739 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
742 // Read the symbol names.
743 const unsigned int strtab_shndx
= symtabshdr
.get_sh_link();
745 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
748 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
750 // Get a view into the output file.
751 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
752 unsigned char* oview
= of
->get_output_view(this->local_symbol_offset_
,
755 const std::vector
<Map_to_output
>& mo(this->map_to_output());
757 gold_assert(this->local_values_
.size() == loccount
);
759 unsigned char* ov
= oview
;
761 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
763 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
765 if (!this->local_values_
[i
].needs_output_symtab_entry())
768 unsigned int st_shndx
= isym
.get_st_shndx();
769 if (st_shndx
< elfcpp::SHN_LORESERVE
)
771 gold_assert(st_shndx
< mo
.size());
772 if (mo
[st_shndx
].output_section
== NULL
)
774 st_shndx
= mo
[st_shndx
].output_section
->out_shndx();
777 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
779 gold_assert(isym
.get_st_name() < strtab_size
);
780 const char* name
= pnames
+ isym
.get_st_name();
781 osym
.put_st_name(sympool
->get_offset(name
));
782 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
783 osym
.put_st_size(isym
.get_st_size());
784 osym
.put_st_info(isym
.get_st_info());
785 osym
.put_st_other(isym
.get_st_other());
786 osym
.put_st_shndx(st_shndx
);
791 gold_assert(ov
- oview
== output_size
);
793 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
796 // Input_objects methods.
798 // Add a regular relocatable object to the list. Return false if this
799 // object should be ignored.
802 Input_objects::add_object(Object
* obj
)
804 if (!obj
->is_dynamic())
805 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
808 // See if this is a duplicate SONAME.
809 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
811 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
812 this->sonames_
.insert(dynobj
->soname());
815 // We have already seen a dynamic object with this soname.
819 this->dynobj_list_
.push_back(dynobj
);
822 Target
* target
= obj
->target();
823 if (this->target_
== NULL
)
824 this->target_
= target
;
825 else if (this->target_
!= target
)
827 fprintf(stderr
, "%s: %s: incompatible target\n",
828 program_name
, obj
->name().c_str());
832 set_parameters_size_and_endianness(target
->get_size(),
833 target
->is_big_endian());
838 // Relocate_info methods.
840 // Return a string describing the location of a relocation. This is
841 // only used in error messages.
843 template<int size
, bool big_endian
>
845 Relocate_info
<size
, big_endian
>::location(size_t relnum
, off_t
) const
847 std::string
ret(this->object
->name());
850 snprintf(buf
, sizeof buf
, "%zu", relnum
);
852 ret
+= " in reloc section ";
853 snprintf(buf
, sizeof buf
, "%u", this->reloc_shndx
);
855 ret
+= " (" + this->object
->section_name(this->reloc_shndx
);
856 ret
+= ") for section ";
857 snprintf(buf
, sizeof buf
, "%u", this->data_shndx
);
859 ret
+= " (" + this->object
->section_name(this->data_shndx
) + ")";
863 } // End namespace gold.
868 using namespace gold
;
870 // Read an ELF file with the header and return the appropriate
871 // instance of Object.
873 template<int size
, bool big_endian
>
875 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
876 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
878 int et
= ehdr
.get_e_type();
879 if (et
== elfcpp::ET_REL
)
881 Sized_relobj
<size
, big_endian
>* obj
=
882 new Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
886 else if (et
== elfcpp::ET_DYN
)
888 Sized_dynobj
<size
, big_endian
>* obj
=
889 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
895 fprintf(stderr
, _("%s: %s: unsupported ELF file type %d\n"),
896 program_name
, name
.c_str(), et
);
901 } // End anonymous namespace.
906 // Read an ELF file and return the appropriate instance of Object.
909 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
910 const unsigned char* p
, off_t bytes
)
912 if (bytes
< elfcpp::EI_NIDENT
)
914 fprintf(stderr
, _("%s: %s: ELF file too short\n"),
915 program_name
, name
.c_str());
919 int v
= p
[elfcpp::EI_VERSION
];
920 if (v
!= elfcpp::EV_CURRENT
)
922 if (v
== elfcpp::EV_NONE
)
923 fprintf(stderr
, _("%s: %s: invalid ELF version 0\n"),
924 program_name
, name
.c_str());
926 fprintf(stderr
, _("%s: %s: unsupported ELF version %d\n"),
927 program_name
, name
.c_str(), v
);
931 int c
= p
[elfcpp::EI_CLASS
];
932 if (c
== elfcpp::ELFCLASSNONE
)
934 fprintf(stderr
, _("%s: %s: invalid ELF class 0\n"),
935 program_name
, name
.c_str());
938 else if (c
!= elfcpp::ELFCLASS32
939 && c
!= elfcpp::ELFCLASS64
)
941 fprintf(stderr
, _("%s: %s: unsupported ELF class %d\n"),
942 program_name
, name
.c_str(), c
);
946 int d
= p
[elfcpp::EI_DATA
];
947 if (d
== elfcpp::ELFDATANONE
)
949 fprintf(stderr
, _("%s: %s: invalid ELF data encoding\n"),
950 program_name
, name
.c_str());
953 else if (d
!= elfcpp::ELFDATA2LSB
954 && d
!= elfcpp::ELFDATA2MSB
)
956 fprintf(stderr
, _("%s: %s: unsupported ELF data encoding %d\n"),
957 program_name
, 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 fprintf(stderr
, _("%s: %s: ELF file too short\n"),
968 program_name
, name
.c_str());
973 #ifdef HAVE_TARGET_32_BIG
974 elfcpp::Ehdr
<32, true> ehdr(p
);
975 return make_elf_sized_object
<32, true>(name
, input_file
,
979 _("%s: %s: not configured to support 32-bit big-endian object\n"),
980 program_name
, name
.c_str());
986 #ifdef HAVE_TARGET_32_LITTLE
987 elfcpp::Ehdr
<32, false> ehdr(p
);
988 return make_elf_sized_object
<32, false>(name
, input_file
,
992 _("%s: %s: not configured to support 32-bit little-endian object\n"),
993 program_name
, name
.c_str());
1000 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
1002 fprintf(stderr
, _("%s: %s: ELF file too short\n"),
1003 program_name
, name
.c_str());
1008 #ifdef HAVE_TARGET_64_BIG
1009 elfcpp::Ehdr
<64, true> ehdr(p
);
1010 return make_elf_sized_object
<64, true>(name
, input_file
,
1014 _("%s: %s: not configured to support 64-bit big-endian object\n"),
1015 program_name
, name
.c_str());
1021 #ifdef HAVE_TARGET_64_LITTLE
1022 elfcpp::Ehdr
<64, false> ehdr(p
);
1023 return make_elf_sized_object
<64, false>(name
, input_file
,
1027 _("%s: %s: not configured to support 64-bit little-endian object\n"),
1028 program_name
, name
.c_str());
1035 // Instantiate the templates we need. We could use the configure
1036 // script to restrict this to only the ones for implemented targets.
1038 #ifdef HAVE_TARGET_32_LITTLE
1040 class Sized_relobj
<32, false>;
1043 #ifdef HAVE_TARGET_32_BIG
1045 class Sized_relobj
<32, true>;
1048 #ifdef HAVE_TARGET_64_LITTLE
1050 class Sized_relobj
<64, false>;
1053 #ifdef HAVE_TARGET_64_BIG
1055 class Sized_relobj
<64, true>;
1058 #ifdef HAVE_TARGET_32_LITTLE
1060 struct Relocate_info
<32, false>;
1063 #ifdef HAVE_TARGET_32_BIG
1065 struct Relocate_info
<32, true>;
1068 #ifdef HAVE_TARGET_64_LITTLE
1070 struct Relocate_info
<64, false>;
1073 #ifdef HAVE_TARGET_64_BIG
1075 struct Relocate_info
<64, true>;
1078 } // End namespace gold.