1 // output.cc -- manage the output file for 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.
32 #include "libiberty.h" // for unlink_if_ordinary()
34 #include "parameters.h"
41 // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
43 # define MAP_ANONYMOUS MAP_ANON
49 // Output_data variables.
51 bool Output_data::allocated_sizes_are_fixed
;
53 // Output_data methods.
55 Output_data::~Output_data()
59 // Return the default alignment for the target size.
62 Output_data::default_alignment()
64 return Output_data::default_alignment_for_size(parameters
->get_size());
67 // Return the default alignment for a size--32 or 64.
70 Output_data::default_alignment_for_size(int size
)
80 // Output_section_header methods. This currently assumes that the
81 // segment and section lists are complete at construction time.
83 Output_section_headers::Output_section_headers(
85 const Layout::Segment_list
* segment_list
,
86 const Layout::Section_list
* unattached_section_list
,
87 const Stringpool
* secnamepool
)
89 segment_list_(segment_list
),
90 unattached_section_list_(unattached_section_list
),
91 secnamepool_(secnamepool
)
93 // Count all the sections. Start with 1 for the null section.
95 for (Layout::Segment_list::const_iterator p
= segment_list
->begin();
96 p
!= segment_list
->end();
98 if ((*p
)->type() == elfcpp::PT_LOAD
)
99 count
+= (*p
)->output_section_count();
100 count
+= unattached_section_list
->size();
102 const int size
= parameters
->get_size();
105 shdr_size
= elfcpp::Elf_sizes
<32>::shdr_size
;
107 shdr_size
= elfcpp::Elf_sizes
<64>::shdr_size
;
111 this->set_data_size(count
* shdr_size
);
114 // Write out the section headers.
117 Output_section_headers::do_write(Output_file
* of
)
119 if (parameters
->get_size() == 32)
121 if (parameters
->is_big_endian())
123 #ifdef HAVE_TARGET_32_BIG
124 this->do_sized_write
<32, true>(of
);
131 #ifdef HAVE_TARGET_32_LITTLE
132 this->do_sized_write
<32, false>(of
);
138 else if (parameters
->get_size() == 64)
140 if (parameters
->is_big_endian())
142 #ifdef HAVE_TARGET_64_BIG
143 this->do_sized_write
<64, true>(of
);
150 #ifdef HAVE_TARGET_64_LITTLE
151 this->do_sized_write
<64, false>(of
);
161 template<int size
, bool big_endian
>
163 Output_section_headers::do_sized_write(Output_file
* of
)
165 off_t all_shdrs_size
= this->data_size();
166 unsigned char* view
= of
->get_output_view(this->offset(), all_shdrs_size
);
168 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
169 unsigned char* v
= view
;
172 typename
elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
173 oshdr
.put_sh_name(0);
174 oshdr
.put_sh_type(elfcpp::SHT_NULL
);
175 oshdr
.put_sh_flags(0);
176 oshdr
.put_sh_addr(0);
177 oshdr
.put_sh_offset(0);
178 oshdr
.put_sh_size(0);
179 oshdr
.put_sh_link(0);
180 oshdr
.put_sh_info(0);
181 oshdr
.put_sh_addralign(0);
182 oshdr
.put_sh_entsize(0);
188 for (Layout::Segment_list::const_iterator p
= this->segment_list_
->begin();
189 p
!= this->segment_list_
->end();
191 v
= (*p
)->write_section_headers
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
192 this->layout_
, this->secnamepool_
, v
, &shndx
193 SELECT_SIZE_ENDIAN(size
, big_endian
));
194 for (Layout::Section_list::const_iterator p
=
195 this->unattached_section_list_
->begin();
196 p
!= this->unattached_section_list_
->end();
199 gold_assert(shndx
== (*p
)->out_shndx());
200 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
201 (*p
)->write_header(this->layout_
, this->secnamepool_
, &oshdr
);
206 of
->write_output_view(this->offset(), all_shdrs_size
, view
);
209 // Output_segment_header methods.
211 Output_segment_headers::Output_segment_headers(
212 const Layout::Segment_list
& segment_list
)
213 : segment_list_(segment_list
)
215 const int size
= parameters
->get_size();
218 phdr_size
= elfcpp::Elf_sizes
<32>::phdr_size
;
220 phdr_size
= elfcpp::Elf_sizes
<64>::phdr_size
;
224 this->set_data_size(segment_list
.size() * phdr_size
);
228 Output_segment_headers::do_write(Output_file
* of
)
230 if (parameters
->get_size() == 32)
232 if (parameters
->is_big_endian())
234 #ifdef HAVE_TARGET_32_BIG
235 this->do_sized_write
<32, true>(of
);
242 #ifdef HAVE_TARGET_32_LITTLE
243 this->do_sized_write
<32, false>(of
);
249 else if (parameters
->get_size() == 64)
251 if (parameters
->is_big_endian())
253 #ifdef HAVE_TARGET_64_BIG
254 this->do_sized_write
<64, true>(of
);
261 #ifdef HAVE_TARGET_64_LITTLE
262 this->do_sized_write
<64, false>(of
);
272 template<int size
, bool big_endian
>
274 Output_segment_headers::do_sized_write(Output_file
* of
)
276 const int phdr_size
= elfcpp::Elf_sizes
<size
>::phdr_size
;
277 off_t all_phdrs_size
= this->segment_list_
.size() * phdr_size
;
278 unsigned char* view
= of
->get_output_view(this->offset(),
280 unsigned char* v
= view
;
281 for (Layout::Segment_list::const_iterator p
= this->segment_list_
.begin();
282 p
!= this->segment_list_
.end();
285 elfcpp::Phdr_write
<size
, big_endian
> ophdr(v
);
286 (*p
)->write_header(&ophdr
);
290 of
->write_output_view(this->offset(), all_phdrs_size
, view
);
293 // Output_file_header methods.
295 Output_file_header::Output_file_header(const Target
* target
,
296 const Symbol_table
* symtab
,
297 const Output_segment_headers
* osh
)
300 segment_header_(osh
),
301 section_header_(NULL
),
304 const int size
= parameters
->get_size();
307 ehdr_size
= elfcpp::Elf_sizes
<32>::ehdr_size
;
309 ehdr_size
= elfcpp::Elf_sizes
<64>::ehdr_size
;
313 this->set_data_size(ehdr_size
);
316 // Set the section table information for a file header.
319 Output_file_header::set_section_info(const Output_section_headers
* shdrs
,
320 const Output_section
* shstrtab
)
322 this->section_header_
= shdrs
;
323 this->shstrtab_
= shstrtab
;
326 // Write out the file header.
329 Output_file_header::do_write(Output_file
* of
)
331 gold_assert(this->offset() == 0);
333 if (parameters
->get_size() == 32)
335 if (parameters
->is_big_endian())
337 #ifdef HAVE_TARGET_32_BIG
338 this->do_sized_write
<32, true>(of
);
345 #ifdef HAVE_TARGET_32_LITTLE
346 this->do_sized_write
<32, false>(of
);
352 else if (parameters
->get_size() == 64)
354 if (parameters
->is_big_endian())
356 #ifdef HAVE_TARGET_64_BIG
357 this->do_sized_write
<64, true>(of
);
364 #ifdef HAVE_TARGET_64_LITTLE
365 this->do_sized_write
<64, false>(of
);
375 // Write out the file header with appropriate size and endianess.
377 template<int size
, bool big_endian
>
379 Output_file_header::do_sized_write(Output_file
* of
)
381 gold_assert(this->offset() == 0);
383 int ehdr_size
= elfcpp::Elf_sizes
<size
>::ehdr_size
;
384 unsigned char* view
= of
->get_output_view(0, ehdr_size
);
385 elfcpp::Ehdr_write
<size
, big_endian
> oehdr(view
);
387 unsigned char e_ident
[elfcpp::EI_NIDENT
];
388 memset(e_ident
, 0, elfcpp::EI_NIDENT
);
389 e_ident
[elfcpp::EI_MAG0
] = elfcpp::ELFMAG0
;
390 e_ident
[elfcpp::EI_MAG1
] = elfcpp::ELFMAG1
;
391 e_ident
[elfcpp::EI_MAG2
] = elfcpp::ELFMAG2
;
392 e_ident
[elfcpp::EI_MAG3
] = elfcpp::ELFMAG3
;
394 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS32
;
396 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS64
;
399 e_ident
[elfcpp::EI_DATA
] = (big_endian
400 ? elfcpp::ELFDATA2MSB
401 : elfcpp::ELFDATA2LSB
);
402 e_ident
[elfcpp::EI_VERSION
] = elfcpp::EV_CURRENT
;
403 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
404 oehdr
.put_e_ident(e_ident
);
407 if (parameters
->output_is_object())
408 e_type
= elfcpp::ET_REL
;
409 else if (parameters
->output_is_shared())
410 e_type
= elfcpp::ET_DYN
;
412 e_type
= elfcpp::ET_EXEC
;
413 oehdr
.put_e_type(e_type
);
415 oehdr
.put_e_machine(this->target_
->machine_code());
416 oehdr
.put_e_version(elfcpp::EV_CURRENT
);
418 // FIXME: Need to support -e, and target specific entry symbol.
419 Symbol
* sym
= this->symtab_
->lookup("_start");
420 typename Sized_symbol
<size
>::Value_type v
;
425 Sized_symbol
<size
>* ssym
;
426 ssym
= this->symtab_
->get_sized_symbol
SELECT_SIZE_NAME(size
) (
427 sym
SELECT_SIZE(size
));
430 oehdr
.put_e_entry(v
);
432 oehdr
.put_e_phoff(this->segment_header_
->offset());
433 oehdr
.put_e_shoff(this->section_header_
->offset());
435 // FIXME: The target needs to set the flags.
436 oehdr
.put_e_flags(0);
438 oehdr
.put_e_ehsize(elfcpp::Elf_sizes
<size
>::ehdr_size
);
439 oehdr
.put_e_phentsize(elfcpp::Elf_sizes
<size
>::phdr_size
);
440 oehdr
.put_e_phnum(this->segment_header_
->data_size()
441 / elfcpp::Elf_sizes
<size
>::phdr_size
);
442 oehdr
.put_e_shentsize(elfcpp::Elf_sizes
<size
>::shdr_size
);
443 oehdr
.put_e_shnum(this->section_header_
->data_size()
444 / elfcpp::Elf_sizes
<size
>::shdr_size
);
445 oehdr
.put_e_shstrndx(this->shstrtab_
->out_shndx());
447 of
->write_output_view(0, ehdr_size
, view
);
450 // Output_data_const methods.
453 Output_data_const::do_write(Output_file
* of
)
455 of
->write(this->offset(), this->data_
.data(), this->data_
.size());
458 // Output_data_const_buffer methods.
461 Output_data_const_buffer::do_write(Output_file
* of
)
463 of
->write(this->offset(), this->p_
, this->data_size());
466 // Output_section_data methods.
468 // Record the output section, and set the entry size and such.
471 Output_section_data::set_output_section(Output_section
* os
)
473 gold_assert(this->output_section_
== NULL
);
474 this->output_section_
= os
;
475 this->do_adjust_output_section(os
);
478 // Return the section index of the output section.
481 Output_section_data::do_out_shndx() const
483 gold_assert(this->output_section_
!= NULL
);
484 return this->output_section_
->out_shndx();
487 // Output_data_strtab methods.
489 // Set the final data size.
492 Output_data_strtab::set_final_data_size()
494 this->strtab_
->set_string_offsets();
495 this->set_data_size(this->strtab_
->get_strtab_size());
498 // Write out a string table.
501 Output_data_strtab::do_write(Output_file
* of
)
503 this->strtab_
->write(of
, this->offset());
506 // Output_reloc methods.
508 // A reloc against a global symbol.
510 template<bool dynamic
, int size
, bool big_endian
>
511 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
517 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
518 is_relative_(is_relative
), shndx_(INVALID_CODE
)
520 this->u1_
.gsym
= gsym
;
522 if (dynamic
&& !is_relative
)
523 gsym
->set_needs_dynsym_entry();
526 template<bool dynamic
, int size
, bool big_endian
>
527 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
534 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
535 is_relative_(is_relative
), shndx_(shndx
)
537 gold_assert(shndx
!= INVALID_CODE
);
538 this->u1_
.gsym
= gsym
;
539 this->u2_
.relobj
= relobj
;
540 if (dynamic
&& !is_relative
)
541 gsym
->set_needs_dynsym_entry();
544 // A reloc against a local symbol.
546 template<bool dynamic
, int size
, bool big_endian
>
547 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
548 Sized_relobj
<size
, big_endian
>* relobj
,
549 unsigned int local_sym_index
,
554 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
555 is_relative_(is_relative
), shndx_(INVALID_CODE
)
557 gold_assert(local_sym_index
!= GSYM_CODE
558 && local_sym_index
!= INVALID_CODE
);
559 this->u1_
.relobj
= relobj
;
561 if (dynamic
&& !is_relative
)
562 relobj
->set_needs_output_dynsym_entry(local_sym_index
);
565 template<bool dynamic
, int size
, bool big_endian
>
566 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
567 Sized_relobj
<size
, big_endian
>* relobj
,
568 unsigned int local_sym_index
,
573 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
574 is_relative_(is_relative
), shndx_(shndx
)
576 gold_assert(local_sym_index
!= GSYM_CODE
577 && local_sym_index
!= INVALID_CODE
);
578 gold_assert(shndx
!= INVALID_CODE
);
579 this->u1_
.relobj
= relobj
;
580 this->u2_
.relobj
= relobj
;
581 if (dynamic
&& !is_relative
)
582 relobj
->set_needs_output_dynsym_entry(local_sym_index
);
585 // A reloc against the STT_SECTION symbol of an output section.
587 template<bool dynamic
, int size
, bool big_endian
>
588 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
593 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
594 is_relative_(false), shndx_(INVALID_CODE
)
599 os
->set_needs_dynsym_index();
602 template<bool dynamic
, int size
, bool big_endian
>
603 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
609 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
610 is_relative_(false), shndx_(shndx
)
612 gold_assert(shndx
!= INVALID_CODE
);
614 this->u2_
.relobj
= relobj
;
616 os
->set_needs_dynsym_index();
619 // Get the symbol index of a relocation.
621 template<bool dynamic
, int size
, bool big_endian
>
623 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::get_symbol_index()
627 switch (this->local_sym_index_
)
633 if (this->u1_
.gsym
== NULL
)
636 index
= this->u1_
.gsym
->dynsym_index();
638 index
= this->u1_
.gsym
->symtab_index();
643 index
= this->u1_
.os
->dynsym_index();
645 index
= this->u1_
.os
->symtab_index();
649 // Relocations without symbols use a symbol index of 0.
655 index
= this->u1_
.relobj
->dynsym_index(this->local_sym_index_
);
657 index
= this->u1_
.relobj
->symtab_index(this->local_sym_index_
);
660 gold_assert(index
!= -1U);
664 // Write out the offset and info fields of a Rel or Rela relocation
667 template<bool dynamic
, int size
, bool big_endian
>
668 template<typename Write_rel
>
670 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write_rel(
673 Address address
= this->address_
;
674 if (this->shndx_
!= INVALID_CODE
)
676 section_offset_type off
;
677 Output_section
* os
= this->u2_
.relobj
->output_section(this->shndx_
,
679 gold_assert(os
!= NULL
);
681 address
+= os
->address() + off
;
684 address
= os
->output_address(this->u2_
.relobj
, this->shndx_
,
686 gold_assert(address
!= -1U);
689 else if (this->u2_
.od
!= NULL
)
690 address
+= this->u2_
.od
->address();
691 wr
->put_r_offset(address
);
692 unsigned int sym_index
= this->is_relative_
? 0 : this->get_symbol_index();
693 wr
->put_r_info(elfcpp::elf_r_info
<size
>(sym_index
, this->type_
));
696 // Write out a Rel relocation.
698 template<bool dynamic
, int size
, bool big_endian
>
700 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write(
701 unsigned char* pov
) const
703 elfcpp::Rel_write
<size
, big_endian
> orel(pov
);
704 this->write_rel(&orel
);
707 // Get the value of the symbol referred to by a Rel relocation.
709 template<bool dynamic
, int size
, bool big_endian
>
710 typename
elfcpp::Elf_types
<size
>::Elf_Addr
711 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::symbol_value() const
713 if (this->local_sym_index_
== GSYM_CODE
)
715 const Sized_symbol
<size
>* sym
;
716 sym
= static_cast<const Sized_symbol
<size
>*>(this->u1_
.gsym
);
719 gold_assert(this->local_sym_index_
!= SECTION_CODE
720 && this->local_sym_index_
!= INVALID_CODE
);
721 const Sized_relobj
<size
, big_endian
>* relobj
= this->u1_
.relobj
;
722 return relobj
->local_symbol_value(this->local_sym_index_
);
725 // Write out a Rela relocation.
727 template<bool dynamic
, int size
, bool big_endian
>
729 Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>::write(
730 unsigned char* pov
) const
732 elfcpp::Rela_write
<size
, big_endian
> orel(pov
);
733 this->rel_
.write_rel(&orel
);
734 Addend addend
= this->addend_
;
735 if (rel_
.is_relative())
736 addend
+= rel_
.symbol_value();
737 orel
.put_r_addend(addend
);
740 // Output_data_reloc_base methods.
742 // Adjust the output section.
744 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
746 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>
747 ::do_adjust_output_section(Output_section
* os
)
749 if (sh_type
== elfcpp::SHT_REL
)
750 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
751 else if (sh_type
== elfcpp::SHT_RELA
)
752 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
756 os
->set_should_link_to_dynsym();
758 os
->set_should_link_to_symtab();
761 // Write out relocation data.
763 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
765 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>::do_write(
768 const off_t off
= this->offset();
769 const off_t oview_size
= this->data_size();
770 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
772 unsigned char* pov
= oview
;
773 for (typename
Relocs::const_iterator p
= this->relocs_
.begin();
774 p
!= this->relocs_
.end();
781 gold_assert(pov
- oview
== oview_size
);
783 of
->write_output_view(off
, oview_size
, oview
);
785 // We no longer need the relocation entries.
786 this->relocs_
.clear();
789 // Output_data_got::Got_entry methods.
791 // Write out the entry.
793 template<int size
, bool big_endian
>
795 Output_data_got
<size
, big_endian
>::Got_entry::write(unsigned char* pov
) const
799 switch (this->local_sym_index_
)
803 // If the symbol is resolved locally, we need to write out the
804 // link-time value, which will be relocated dynamically by a
805 // RELATIVE relocation.
806 Symbol
* gsym
= this->u_
.gsym
;
807 Sized_symbol
<size
>* sgsym
;
808 // This cast is a bit ugly. We don't want to put a
809 // virtual method in Symbol, because we want Symbol to be
810 // as small as possible.
811 sgsym
= static_cast<Sized_symbol
<size
>*>(gsym
);
812 val
= sgsym
->value();
817 val
= this->u_
.constant
;
821 val
= this->u_
.object
->local_symbol_value(this->local_sym_index_
);
825 elfcpp::Swap
<size
, big_endian
>::writeval(pov
, val
);
828 // Output_data_got methods.
830 // Add an entry for a global symbol to the GOT. This returns true if
831 // this is a new GOT entry, false if the symbol already had a GOT
834 template<int size
, bool big_endian
>
836 Output_data_got
<size
, big_endian
>::add_global(Symbol
* gsym
)
838 if (gsym
->has_got_offset())
841 this->entries_
.push_back(Got_entry(gsym
));
842 this->set_got_size();
843 gsym
->set_got_offset(this->last_got_offset());
847 // Add an entry for a global symbol to the GOT, and add a dynamic
848 // relocation of type R_TYPE for the GOT entry.
849 template<int size
, bool big_endian
>
851 Output_data_got
<size
, big_endian
>::add_global_with_rel(
856 if (gsym
->has_got_offset())
859 this->entries_
.push_back(Got_entry());
860 this->set_got_size();
861 unsigned int got_offset
= this->last_got_offset();
862 gsym
->set_got_offset(got_offset
);
863 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
866 template<int size
, bool big_endian
>
868 Output_data_got
<size
, big_endian
>::add_global_with_rela(
873 if (gsym
->has_got_offset())
876 this->entries_
.push_back(Got_entry());
877 this->set_got_size();
878 unsigned int got_offset
= this->last_got_offset();
879 gsym
->set_got_offset(got_offset
);
880 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
883 // Add an entry for a local symbol to the GOT. This returns true if
884 // this is a new GOT entry, false if the symbol already has a GOT
887 template<int size
, bool big_endian
>
889 Output_data_got
<size
, big_endian
>::add_local(
890 Sized_relobj
<size
, big_endian
>* object
,
893 if (object
->local_has_got_offset(symndx
))
896 this->entries_
.push_back(Got_entry(object
, symndx
));
897 this->set_got_size();
898 object
->set_local_got_offset(symndx
, this->last_got_offset());
902 // Add an entry for a local symbol to the GOT, and add a dynamic
903 // relocation of type R_TYPE for the GOT entry.
904 template<int size
, bool big_endian
>
906 Output_data_got
<size
, big_endian
>::add_local_with_rel(
907 Sized_relobj
<size
, big_endian
>* object
,
912 if (object
->local_has_got_offset(symndx
))
915 this->entries_
.push_back(Got_entry());
916 this->set_got_size();
917 unsigned int got_offset
= this->last_got_offset();
918 object
->set_local_got_offset(symndx
, got_offset
);
919 rel_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
);
922 template<int size
, bool big_endian
>
924 Output_data_got
<size
, big_endian
>::add_local_with_rela(
925 Sized_relobj
<size
, big_endian
>* object
,
930 if (object
->local_has_got_offset(symndx
))
933 this->entries_
.push_back(Got_entry());
934 this->set_got_size();
935 unsigned int got_offset
= this->last_got_offset();
936 object
->set_local_got_offset(symndx
, got_offset
);
937 rela_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
, 0);
940 // Add an entry (or a pair of entries) for a global TLS symbol to the GOT.
941 // In a pair of entries, the first value in the pair will be used for the
942 // module index, and the second value will be used for the dtv-relative
943 // offset. This returns true if this is a new GOT entry, false if the symbol
944 // already has a GOT entry.
946 template<int size
, bool big_endian
>
948 Output_data_got
<size
, big_endian
>::add_global_tls(Symbol
* gsym
, bool need_pair
)
950 if (gsym
->has_tls_got_offset(need_pair
))
953 this->entries_
.push_back(Got_entry(gsym
));
954 gsym
->set_tls_got_offset(this->last_got_offset(), need_pair
);
956 this->entries_
.push_back(Got_entry(gsym
));
957 this->set_got_size();
961 // Add an entry for a global TLS symbol to the GOT, and add a dynamic
962 // relocation of type R_TYPE.
963 template<int size
, bool big_endian
>
965 Output_data_got
<size
, big_endian
>::add_global_tls_with_rel(
970 if (gsym
->has_tls_got_offset(false))
973 this->entries_
.push_back(Got_entry());
974 this->set_got_size();
975 unsigned int got_offset
= this->last_got_offset();
976 gsym
->set_tls_got_offset(got_offset
, false);
977 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
980 template<int size
, bool big_endian
>
982 Output_data_got
<size
, big_endian
>::add_global_tls_with_rela(
987 if (gsym
->has_tls_got_offset(false))
990 this->entries_
.push_back(Got_entry());
991 this->set_got_size();
992 unsigned int got_offset
= this->last_got_offset();
993 gsym
->set_tls_got_offset(got_offset
, false);
994 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
997 // Add a pair of entries for a global TLS symbol to the GOT, and add
998 // dynamic relocations of type MOD_R_TYPE and DTV_R_TYPE, respectively.
999 template<int size
, bool big_endian
>
1001 Output_data_got
<size
, big_endian
>::add_global_tls_with_rel(
1004 unsigned int mod_r_type
,
1005 unsigned int dtv_r_type
)
1007 if (gsym
->has_tls_got_offset(true))
1010 this->entries_
.push_back(Got_entry());
1011 unsigned int got_offset
= this->last_got_offset();
1012 gsym
->set_tls_got_offset(got_offset
, true);
1013 rel_dyn
->add_global(gsym
, mod_r_type
, this, got_offset
);
1015 this->entries_
.push_back(Got_entry());
1016 this->set_got_size();
1017 got_offset
= this->last_got_offset();
1018 rel_dyn
->add_global(gsym
, dtv_r_type
, this, got_offset
);
1021 template<int size
, bool big_endian
>
1023 Output_data_got
<size
, big_endian
>::add_global_tls_with_rela(
1026 unsigned int mod_r_type
,
1027 unsigned int dtv_r_type
)
1029 if (gsym
->has_tls_got_offset(true))
1032 this->entries_
.push_back(Got_entry());
1033 unsigned int got_offset
= this->last_got_offset();
1034 gsym
->set_tls_got_offset(got_offset
, true);
1035 rela_dyn
->add_global(gsym
, mod_r_type
, this, got_offset
, 0);
1037 this->entries_
.push_back(Got_entry());
1038 this->set_got_size();
1039 got_offset
= this->last_got_offset();
1040 rela_dyn
->add_global(gsym
, dtv_r_type
, this, got_offset
, 0);
1043 // Add an entry (or a pair of entries) for a local TLS symbol to the GOT.
1044 // In a pair of entries, the first value in the pair will be used for the
1045 // module index, and the second value will be used for the dtv-relative
1046 // offset. This returns true if this is a new GOT entry, false if the symbol
1047 // already has a GOT entry.
1049 template<int size
, bool big_endian
>
1051 Output_data_got
<size
, big_endian
>::add_local_tls(
1052 Sized_relobj
<size
, big_endian
>* object
,
1053 unsigned int symndx
,
1056 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1059 this->entries_
.push_back(Got_entry(object
, symndx
));
1060 object
->set_local_tls_got_offset(symndx
, this->last_got_offset(), need_pair
);
1062 this->entries_
.push_back(Got_entry(object
, symndx
));
1063 this->set_got_size();
1067 // Add an entry (or pair of entries) for a local TLS symbol to the GOT,
1068 // and add a dynamic relocation of type R_TYPE for the first GOT entry.
1069 // Because this is a local symbol, the first GOT entry can be relocated
1070 // relative to a section symbol, and the second GOT entry will have an
1071 // dtv-relative value that can be computed at link time.
1072 template<int size
, bool big_endian
>
1074 Output_data_got
<size
, big_endian
>::add_local_tls_with_rel(
1075 Sized_relobj
<size
, big_endian
>* object
,
1076 unsigned int symndx
,
1080 unsigned int r_type
)
1082 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1085 this->entries_
.push_back(Got_entry());
1086 unsigned int got_offset
= this->last_got_offset();
1087 object
->set_local_tls_got_offset(symndx
, got_offset
, need_pair
);
1088 section_offset_type off
;
1089 Output_section
* os
= object
->output_section(shndx
, &off
);
1090 rel_dyn
->add_output_section(os
, r_type
, this, got_offset
);
1092 // The second entry of the pair will be statically initialized
1093 // with the TLS offset of the symbol.
1095 this->entries_
.push_back(Got_entry(object
, symndx
));
1097 this->set_got_size();
1100 template<int size
, bool big_endian
>
1102 Output_data_got
<size
, big_endian
>::add_local_tls_with_rela(
1103 Sized_relobj
<size
, big_endian
>* object
,
1104 unsigned int symndx
,
1108 unsigned int r_type
)
1110 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1113 this->entries_
.push_back(Got_entry());
1114 unsigned int got_offset
= this->last_got_offset();
1115 object
->set_local_tls_got_offset(symndx
, got_offset
, need_pair
);
1116 section_offset_type off
;
1117 Output_section
* os
= object
->output_section(shndx
, &off
);
1118 rela_dyn
->add_output_section(os
, r_type
, this, got_offset
, 0);
1120 // The second entry of the pair will be statically initialized
1121 // with the TLS offset of the symbol.
1123 this->entries_
.push_back(Got_entry(object
, symndx
));
1125 this->set_got_size();
1128 // Write out the GOT.
1130 template<int size
, bool big_endian
>
1132 Output_data_got
<size
, big_endian
>::do_write(Output_file
* of
)
1134 const int add
= size
/ 8;
1136 const off_t off
= this->offset();
1137 const off_t oview_size
= this->data_size();
1138 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1140 unsigned char* pov
= oview
;
1141 for (typename
Got_entries::const_iterator p
= this->entries_
.begin();
1142 p
!= this->entries_
.end();
1149 gold_assert(pov
- oview
== oview_size
);
1151 of
->write_output_view(off
, oview_size
, oview
);
1153 // We no longer need the GOT entries.
1154 this->entries_
.clear();
1157 // Output_data_dynamic::Dynamic_entry methods.
1159 // Write out the entry.
1161 template<int size
, bool big_endian
>
1163 Output_data_dynamic::Dynamic_entry::write(
1165 const Stringpool
* pool
1166 ACCEPT_SIZE_ENDIAN
) const
1168 typename
elfcpp::Elf_types
<size
>::Elf_WXword val
;
1169 switch (this->classification_
)
1171 case DYNAMIC_NUMBER
:
1175 case DYNAMIC_SECTION_ADDRESS
:
1176 val
= this->u_
.od
->address();
1179 case DYNAMIC_SECTION_SIZE
:
1180 val
= this->u_
.od
->data_size();
1183 case DYNAMIC_SYMBOL
:
1185 const Sized_symbol
<size
>* s
=
1186 static_cast<const Sized_symbol
<size
>*>(this->u_
.sym
);
1191 case DYNAMIC_STRING
:
1192 val
= pool
->get_offset(this->u_
.str
);
1199 elfcpp::Dyn_write
<size
, big_endian
> dw(pov
);
1200 dw
.put_d_tag(this->tag_
);
1204 // Output_data_dynamic methods.
1206 // Adjust the output section to set the entry size.
1209 Output_data_dynamic::do_adjust_output_section(Output_section
* os
)
1211 if (parameters
->get_size() == 32)
1212 os
->set_entsize(elfcpp::Elf_sizes
<32>::dyn_size
);
1213 else if (parameters
->get_size() == 64)
1214 os
->set_entsize(elfcpp::Elf_sizes
<64>::dyn_size
);
1219 // Set the final data size.
1222 Output_data_dynamic::set_final_data_size()
1224 // Add the terminating entry.
1225 this->add_constant(elfcpp::DT_NULL
, 0);
1228 if (parameters
->get_size() == 32)
1229 dyn_size
= elfcpp::Elf_sizes
<32>::dyn_size
;
1230 else if (parameters
->get_size() == 64)
1231 dyn_size
= elfcpp::Elf_sizes
<64>::dyn_size
;
1234 this->set_data_size(this->entries_
.size() * dyn_size
);
1237 // Write out the dynamic entries.
1240 Output_data_dynamic::do_write(Output_file
* of
)
1242 if (parameters
->get_size() == 32)
1244 if (parameters
->is_big_endian())
1246 #ifdef HAVE_TARGET_32_BIG
1247 this->sized_write
<32, true>(of
);
1254 #ifdef HAVE_TARGET_32_LITTLE
1255 this->sized_write
<32, false>(of
);
1261 else if (parameters
->get_size() == 64)
1263 if (parameters
->is_big_endian())
1265 #ifdef HAVE_TARGET_64_BIG
1266 this->sized_write
<64, true>(of
);
1273 #ifdef HAVE_TARGET_64_LITTLE
1274 this->sized_write
<64, false>(of
);
1284 template<int size
, bool big_endian
>
1286 Output_data_dynamic::sized_write(Output_file
* of
)
1288 const int dyn_size
= elfcpp::Elf_sizes
<size
>::dyn_size
;
1290 const off_t offset
= this->offset();
1291 const off_t oview_size
= this->data_size();
1292 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1294 unsigned char* pov
= oview
;
1295 for (typename
Dynamic_entries::const_iterator p
= this->entries_
.begin();
1296 p
!= this->entries_
.end();
1299 p
->write
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1300 pov
, this->pool_
SELECT_SIZE_ENDIAN(size
, big_endian
));
1304 gold_assert(pov
- oview
== oview_size
);
1306 of
->write_output_view(offset
, oview_size
, oview
);
1308 // We no longer need the dynamic entries.
1309 this->entries_
.clear();
1312 // Output_section::Input_section methods.
1314 // Return the data size. For an input section we store the size here.
1315 // For an Output_section_data, we have to ask it for the size.
1318 Output_section::Input_section::data_size() const
1320 if (this->is_input_section())
1321 return this->u1_
.data_size
;
1323 return this->u2_
.posd
->data_size();
1326 // Set the address and file offset.
1329 Output_section::Input_section::set_address_and_file_offset(
1332 off_t section_file_offset
)
1334 if (this->is_input_section())
1335 this->u2_
.object
->set_section_offset(this->shndx_
,
1336 file_offset
- section_file_offset
);
1338 this->u2_
.posd
->set_address_and_file_offset(address
, file_offset
);
1341 // Finalize the data size.
1344 Output_section::Input_section::finalize_data_size()
1346 if (!this->is_input_section())
1347 this->u2_
.posd
->finalize_data_size();
1350 // Try to turn an input offset into an output offset. We want to
1351 // return the output offset relative to the start of this
1352 // Input_section in the output section.
1355 Output_section::Input_section::output_offset(
1356 const Relobj
* object
,
1358 section_offset_type offset
,
1359 section_offset_type
*poutput
) const
1361 if (!this->is_input_section())
1362 return this->u2_
.posd
->output_offset(object
, shndx
, offset
, poutput
);
1365 if (this->shndx_
!= shndx
|| this->u2_
.object
!= object
)
1372 // Return whether this is the merge section for the input section
1376 Output_section::Input_section::is_merge_section_for(const Relobj
* object
,
1377 unsigned int shndx
) const
1379 if (this->is_input_section())
1381 return this->u2_
.posd
->is_merge_section_for(object
, shndx
);
1384 // Write out the data. We don't have to do anything for an input
1385 // section--they are handled via Object::relocate--but this is where
1386 // we write out the data for an Output_section_data.
1389 Output_section::Input_section::write(Output_file
* of
)
1391 if (!this->is_input_section())
1392 this->u2_
.posd
->write(of
);
1395 // Write the data to a buffer. As for write(), we don't have to do
1396 // anything for an input section.
1399 Output_section::Input_section::write_to_buffer(unsigned char* buffer
)
1401 if (!this->is_input_section())
1402 this->u2_
.posd
->write_to_buffer(buffer
);
1405 // Output_section methods.
1407 // Construct an Output_section. NAME will point into a Stringpool.
1409 Output_section::Output_section(const char* name
, elfcpp::Elf_Word type
,
1410 elfcpp::Elf_Xword flags
)
1414 link_section_(NULL
),
1416 info_section_(NULL
),
1424 first_input_offset_(0),
1426 postprocessing_buffer_(NULL
),
1427 needs_symtab_index_(false),
1428 needs_dynsym_index_(false),
1429 should_link_to_symtab_(false),
1430 should_link_to_dynsym_(false),
1431 after_input_sections_(false),
1432 requires_postprocessing_(false),
1435 // An unallocated section has no address. Forcing this means that
1436 // we don't need special treatment for symbols defined in debug
1438 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
1439 this->set_address(0);
1442 Output_section::~Output_section()
1446 // Set the entry size.
1449 Output_section::set_entsize(uint64_t v
)
1451 if (this->entsize_
== 0)
1454 gold_assert(this->entsize_
== v
);
1457 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1458 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1459 // relocation section which applies to this section, or 0 if none, or
1460 // -1U if more than one. Return the offset of the input section
1461 // within the output section. Return -1 if the input section will
1462 // receive special handling. In the normal case we don't always keep
1463 // track of input sections for an Output_section. Instead, each
1464 // Object keeps track of the Output_section for each of its input
1467 template<int size
, bool big_endian
>
1469 Output_section::add_input_section(Sized_relobj
<size
, big_endian
>* object
,
1471 const char* secname
,
1472 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1473 unsigned int reloc_shndx
)
1475 elfcpp::Elf_Xword addralign
= shdr
.get_sh_addralign();
1476 if ((addralign
& (addralign
- 1)) != 0)
1478 object
->error(_("invalid alignment %lu for section \"%s\""),
1479 static_cast<unsigned long>(addralign
), secname
);
1483 if (addralign
> this->addralign_
)
1484 this->addralign_
= addralign
;
1486 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_flags
= shdr
.get_sh_flags();
1487 uint64_t entsize
= shdr
.get_sh_entsize();
1489 // .debug_str is a mergeable string section, but is not always so
1490 // marked by compilers. Mark manually here so we can optimize.
1491 if (strcmp(secname
, ".debug_str") == 0)
1493 sh_flags
|= (elfcpp::SHF_MERGE
| elfcpp::SHF_STRINGS
);
1497 // If this is a SHF_MERGE section, we pass all the input sections to
1498 // a Output_data_merge. We don't try to handle relocations for such
1500 if ((sh_flags
& elfcpp::SHF_MERGE
) != 0
1501 && reloc_shndx
== 0)
1503 if (this->add_merge_input_section(object
, shndx
, sh_flags
,
1504 entsize
, addralign
))
1506 // Tell the relocation routines that they need to call the
1507 // output_offset method to determine the final address.
1512 off_t offset_in_section
= this->current_data_size_for_child();
1513 off_t aligned_offset_in_section
= align_address(offset_in_section
,
1516 if (aligned_offset_in_section
> offset_in_section
1517 && (sh_flags
& elfcpp::SHF_EXECINSTR
) != 0
1518 && object
->target()->has_code_fill())
1520 // We need to add some fill data. Using fill_list_ when
1521 // possible is an optimization, since we will often have fill
1522 // sections without input sections.
1523 off_t fill_len
= aligned_offset_in_section
- offset_in_section
;
1524 if (this->input_sections_
.empty())
1525 this->fills_
.push_back(Fill(offset_in_section
, fill_len
));
1528 // FIXME: When relaxing, the size needs to adjust to
1529 // maintain a constant alignment.
1530 std::string
fill_data(object
->target()->code_fill(fill_len
));
1531 Output_data_const
* odc
= new Output_data_const(fill_data
, 1);
1532 this->input_sections_
.push_back(Input_section(odc
));
1536 this->set_current_data_size_for_child(aligned_offset_in_section
1537 + shdr
.get_sh_size());
1539 // We need to keep track of this section if we are already keeping
1540 // track of sections, or if we are relaxing. FIXME: Add test for
1542 if (!this->input_sections_
.empty())
1543 this->input_sections_
.push_back(Input_section(object
, shndx
,
1547 return aligned_offset_in_section
;
1550 // Add arbitrary data to an output section.
1553 Output_section::add_output_section_data(Output_section_data
* posd
)
1555 Input_section
inp(posd
);
1556 this->add_output_section_data(&inp
);
1559 // Add arbitrary data to an output section by Input_section.
1562 Output_section::add_output_section_data(Input_section
* inp
)
1564 if (this->input_sections_
.empty())
1565 this->first_input_offset_
= this->current_data_size_for_child();
1567 this->input_sections_
.push_back(*inp
);
1569 uint64_t addralign
= inp
->addralign();
1570 if (addralign
> this->addralign_
)
1571 this->addralign_
= addralign
;
1573 inp
->set_output_section(this);
1576 // Add a merge section to an output section.
1579 Output_section::add_output_merge_section(Output_section_data
* posd
,
1580 bool is_string
, uint64_t entsize
)
1582 Input_section
inp(posd
, is_string
, entsize
);
1583 this->add_output_section_data(&inp
);
1586 // Add an input section to a SHF_MERGE section.
1589 Output_section::add_merge_input_section(Relobj
* object
, unsigned int shndx
,
1590 uint64_t flags
, uint64_t entsize
,
1593 bool is_string
= (flags
& elfcpp::SHF_STRINGS
) != 0;
1595 // We only merge strings if the alignment is not more than the
1596 // character size. This could be handled, but it's unusual.
1597 if (is_string
&& addralign
> entsize
)
1600 Input_section_list::iterator p
;
1601 for (p
= this->input_sections_
.begin();
1602 p
!= this->input_sections_
.end();
1604 if (p
->is_merge_section(is_string
, entsize
, addralign
))
1606 p
->add_input_section(object
, shndx
);
1610 // We handle the actual constant merging in Output_merge_data or
1611 // Output_merge_string_data.
1612 Output_section_data
* posd
;
1614 posd
= new Output_merge_data(entsize
, addralign
);
1620 posd
= new Output_merge_string
<char>(addralign
);
1623 posd
= new Output_merge_string
<uint16_t>(addralign
);
1626 posd
= new Output_merge_string
<uint32_t>(addralign
);
1633 this->add_output_merge_section(posd
, is_string
, entsize
);
1634 posd
->add_input_section(object
, shndx
);
1639 // Given an address OFFSET relative to the start of input section
1640 // SHNDX in OBJECT, return whether this address is being included in
1641 // the final link. This should only be called if SHNDX in OBJECT has
1642 // a special mapping.
1645 Output_section::is_input_address_mapped(const Relobj
* object
,
1649 gold_assert(object
->is_section_specially_mapped(shndx
));
1651 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1652 p
!= this->input_sections_
.end();
1655 section_offset_type output_offset
;
1656 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1657 return output_offset
!= -1;
1660 // By default we assume that the address is mapped. This should
1661 // only be called after we have passed all sections to Layout. At
1662 // that point we should know what we are discarding.
1666 // Given an address OFFSET relative to the start of input section
1667 // SHNDX in object OBJECT, return the output offset relative to the
1668 // start of the input section in the output section. This should only
1669 // be called if SHNDX in OBJECT has a special mapping.
1672 Output_section::output_offset(const Relobj
* object
, unsigned int shndx
,
1673 section_offset_type offset
) const
1675 gold_assert(object
->is_section_specially_mapped(shndx
));
1676 // This can only be called meaningfully when layout is complete.
1677 gold_assert(Output_data::is_layout_complete());
1679 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1680 p
!= this->input_sections_
.end();
1683 section_offset_type output_offset
;
1684 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1685 return output_offset
;
1690 // Return the output virtual address of OFFSET relative to the start
1691 // of input section SHNDX in object OBJECT.
1694 Output_section::output_address(const Relobj
* object
, unsigned int shndx
,
1697 gold_assert(object
->is_section_specially_mapped(shndx
));
1699 uint64_t addr
= this->address() + this->first_input_offset_
;
1700 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1701 p
!= this->input_sections_
.end();
1704 addr
= align_address(addr
, p
->addralign());
1705 section_offset_type output_offset
;
1706 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1708 if (output_offset
== -1)
1710 return addr
+ output_offset
;
1712 addr
+= p
->data_size();
1715 // If we get here, it means that we don't know the mapping for this
1716 // input section. This might happen in principle if
1717 // add_input_section were called before add_output_section_data.
1718 // But it should never actually happen.
1723 // Return the output address of the start of the merged section for
1724 // input section SHNDX in object OBJECT.
1727 Output_section::starting_output_address(const Relobj
* object
,
1728 unsigned int shndx
) const
1730 gold_assert(object
->is_section_specially_mapped(shndx
));
1732 uint64_t addr
= this->address() + this->first_input_offset_
;
1733 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1734 p
!= this->input_sections_
.end();
1737 addr
= align_address(addr
, p
->addralign());
1739 // It would be nice if we could use the existing output_offset
1740 // method to get the output offset of input offset 0.
1741 // Unfortunately we don't know for sure that input offset 0 is
1743 if (p
->is_merge_section_for(object
, shndx
))
1746 addr
+= p
->data_size();
1751 // Set the data size of an Output_section. This is where we handle
1752 // setting the addresses of any Output_section_data objects.
1755 Output_section::set_final_data_size()
1757 if (this->input_sections_
.empty())
1759 this->set_data_size(this->current_data_size_for_child());
1763 uint64_t address
= this->address();
1764 off_t startoff
= this->offset();
1765 off_t off
= startoff
+ this->first_input_offset_
;
1766 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1767 p
!= this->input_sections_
.end();
1770 off
= align_address(off
, p
->addralign());
1771 p
->set_address_and_file_offset(address
+ (off
- startoff
), off
,
1773 off
+= p
->data_size();
1776 this->set_data_size(off
- startoff
);
1779 // Set the TLS offset. Called only for SHT_TLS sections.
1782 Output_section::do_set_tls_offset(uint64_t tls_base
)
1784 this->tls_offset_
= this->address() - tls_base
;
1787 // Write the section header to *OSHDR.
1789 template<int size
, bool big_endian
>
1791 Output_section::write_header(const Layout
* layout
,
1792 const Stringpool
* secnamepool
,
1793 elfcpp::Shdr_write
<size
, big_endian
>* oshdr
) const
1795 oshdr
->put_sh_name(secnamepool
->get_offset(this->name_
));
1796 oshdr
->put_sh_type(this->type_
);
1797 oshdr
->put_sh_flags(this->flags_
);
1798 oshdr
->put_sh_addr(this->address());
1799 oshdr
->put_sh_offset(this->offset());
1800 oshdr
->put_sh_size(this->data_size());
1801 if (this->link_section_
!= NULL
)
1802 oshdr
->put_sh_link(this->link_section_
->out_shndx());
1803 else if (this->should_link_to_symtab_
)
1804 oshdr
->put_sh_link(layout
->symtab_section()->out_shndx());
1805 else if (this->should_link_to_dynsym_
)
1806 oshdr
->put_sh_link(layout
->dynsym_section()->out_shndx());
1808 oshdr
->put_sh_link(this->link_
);
1809 if (this->info_section_
!= NULL
)
1810 oshdr
->put_sh_info(this->info_section_
->out_shndx());
1812 oshdr
->put_sh_info(this->info_
);
1813 oshdr
->put_sh_addralign(this->addralign_
);
1814 oshdr
->put_sh_entsize(this->entsize_
);
1817 // Write out the data. For input sections the data is written out by
1818 // Object::relocate, but we have to handle Output_section_data objects
1822 Output_section::do_write(Output_file
* of
)
1824 gold_assert(!this->requires_postprocessing());
1826 off_t output_section_file_offset
= this->offset();
1827 for (Fill_list::iterator p
= this->fills_
.begin();
1828 p
!= this->fills_
.end();
1831 std::string
fill_data(of
->target()->code_fill(p
->length()));
1832 of
->write(output_section_file_offset
+ p
->section_offset(),
1833 fill_data
.data(), fill_data
.size());
1836 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1837 p
!= this->input_sections_
.end();
1842 // If a section requires postprocessing, create the buffer to use.
1845 Output_section::create_postprocessing_buffer()
1847 gold_assert(this->requires_postprocessing());
1849 if (this->postprocessing_buffer_
!= NULL
)
1852 if (!this->input_sections_
.empty())
1854 off_t off
= this->first_input_offset_
;
1855 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1856 p
!= this->input_sections_
.end();
1859 off
= align_address(off
, p
->addralign());
1860 p
->finalize_data_size();
1861 off
+= p
->data_size();
1863 this->set_current_data_size_for_child(off
);
1866 off_t buffer_size
= this->current_data_size_for_child();
1867 this->postprocessing_buffer_
= new unsigned char[buffer_size
];
1870 // Write all the data of an Output_section into the postprocessing
1871 // buffer. This is used for sections which require postprocessing,
1872 // such as compression. Input sections are handled by
1873 // Object::Relocate.
1876 Output_section::write_to_postprocessing_buffer()
1878 gold_assert(this->requires_postprocessing());
1880 Target
* target
= parameters
->target();
1881 unsigned char* buffer
= this->postprocessing_buffer();
1882 for (Fill_list::iterator p
= this->fills_
.begin();
1883 p
!= this->fills_
.end();
1886 std::string
fill_data(target
->code_fill(p
->length()));
1887 memcpy(buffer
+ p
->section_offset(), fill_data
.data(), fill_data
.size());
1890 off_t off
= this->first_input_offset_
;
1891 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1892 p
!= this->input_sections_
.end();
1895 off
= align_address(off
, p
->addralign());
1896 p
->write_to_buffer(buffer
+ off
);
1897 off
+= p
->data_size();
1901 // Print stats for merge sections to stderr.
1904 Output_section::print_merge_stats()
1906 Input_section_list::iterator p
;
1907 for (p
= this->input_sections_
.begin();
1908 p
!= this->input_sections_
.end();
1910 p
->print_merge_stats(this->name_
);
1913 // Output segment methods.
1915 Output_segment::Output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
1926 is_align_known_(false)
1930 // Add an Output_section to an Output_segment.
1933 Output_segment::add_output_section(Output_section
* os
,
1934 elfcpp::Elf_Word seg_flags
,
1937 gold_assert((os
->flags() & elfcpp::SHF_ALLOC
) != 0);
1938 gold_assert(!this->is_align_known_
);
1940 // Update the segment flags.
1941 this->flags_
|= seg_flags
;
1943 Output_segment::Output_data_list
* pdl
;
1944 if (os
->type() == elfcpp::SHT_NOBITS
)
1945 pdl
= &this->output_bss_
;
1947 pdl
= &this->output_data_
;
1949 // So that PT_NOTE segments will work correctly, we need to ensure
1950 // that all SHT_NOTE sections are adjacent. This will normally
1951 // happen automatically, because all the SHT_NOTE input sections
1952 // will wind up in the same output section. However, it is possible
1953 // for multiple SHT_NOTE input sections to have different section
1954 // flags, and thus be in different output sections, but for the
1955 // different section flags to map into the same segment flags and
1956 // thus the same output segment.
1958 // Note that while there may be many input sections in an output
1959 // section, there are normally only a few output sections in an
1960 // output segment. This loop is expected to be fast.
1962 if (os
->type() == elfcpp::SHT_NOTE
&& !pdl
->empty())
1964 Output_segment::Output_data_list::iterator p
= pdl
->end();
1968 if ((*p
)->is_section_type(elfcpp::SHT_NOTE
))
1970 // We don't worry about the FRONT parameter.
1976 while (p
!= pdl
->begin());
1979 // Similarly, so that PT_TLS segments will work, we need to group
1980 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
1981 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
1982 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
1983 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
1984 // and the PT_TLS segment -- we do this grouping only for the
1986 if (this->type_
!= elfcpp::PT_TLS
1987 && (os
->flags() & elfcpp::SHF_TLS
) != 0
1988 && !this->output_data_
.empty())
1990 pdl
= &this->output_data_
;
1991 bool nobits
= os
->type() == elfcpp::SHT_NOBITS
;
1992 bool sawtls
= false;
1993 Output_segment::Output_data_list::iterator p
= pdl
->end();
1998 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
2001 // Put a NOBITS section after the first TLS section.
2002 // But a PROGBITS section after the first TLS/PROGBITS
2004 insert
= nobits
|| !(*p
)->is_section_type(elfcpp::SHT_NOBITS
);
2008 // If we've gone past the TLS sections, but we've seen a
2009 // TLS section, then we need to insert this section now.
2015 // We don't worry about the FRONT parameter.
2021 while (p
!= pdl
->begin());
2023 // There are no TLS sections yet; put this one at the requested
2024 // location in the section list.
2028 pdl
->push_front(os
);
2033 // Add an Output_data (which is not an Output_section) to the start of
2037 Output_segment::add_initial_output_data(Output_data
* od
)
2039 gold_assert(!this->is_align_known_
);
2040 this->output_data_
.push_front(od
);
2043 // Return the maximum alignment of the Output_data in Output_segment.
2044 // Once we compute this, we prohibit new sections from being added.
2047 Output_segment::addralign()
2049 if (!this->is_align_known_
)
2053 addralign
= Output_segment::maximum_alignment(&this->output_data_
);
2054 if (addralign
> this->align_
)
2055 this->align_
= addralign
;
2057 addralign
= Output_segment::maximum_alignment(&this->output_bss_
);
2058 if (addralign
> this->align_
)
2059 this->align_
= addralign
;
2061 this->is_align_known_
= true;
2064 return this->align_
;
2067 // Return the maximum alignment of a list of Output_data.
2070 Output_segment::maximum_alignment(const Output_data_list
* pdl
)
2073 for (Output_data_list::const_iterator p
= pdl
->begin();
2077 uint64_t addralign
= (*p
)->addralign();
2078 if (addralign
> ret
)
2084 // Return the number of dynamic relocs applied to this segment.
2087 Output_segment::dynamic_reloc_count() const
2089 return (this->dynamic_reloc_count_list(&this->output_data_
)
2090 + this->dynamic_reloc_count_list(&this->output_bss_
));
2093 // Return the number of dynamic relocs applied to an Output_data_list.
2096 Output_segment::dynamic_reloc_count_list(const Output_data_list
* pdl
) const
2098 unsigned int count
= 0;
2099 for (Output_data_list::const_iterator p
= pdl
->begin();
2102 count
+= (*p
)->dynamic_reloc_count();
2106 // Set the section addresses for an Output_segment. ADDR is the
2107 // address and *POFF is the file offset. Set the section indexes
2108 // starting with *PSHNDX. Return the address of the immediately
2109 // following segment. Update *POFF and *PSHNDX.
2112 Output_segment::set_section_addresses(uint64_t addr
, off_t
* poff
,
2113 unsigned int* pshndx
)
2115 gold_assert(this->type_
== elfcpp::PT_LOAD
);
2117 this->vaddr_
= addr
;
2118 this->paddr_
= addr
;
2120 off_t orig_off
= *poff
;
2121 this->offset_
= orig_off
;
2123 *poff
= align_address(*poff
, this->addralign());
2125 addr
= this->set_section_list_addresses(&this->output_data_
, addr
, poff
,
2127 this->filesz_
= *poff
- orig_off
;
2131 uint64_t ret
= this->set_section_list_addresses(&this->output_bss_
, addr
,
2133 this->memsz_
= *poff
- orig_off
;
2135 // Ignore the file offset adjustments made by the BSS Output_data
2142 // Set the addresses and file offsets in a list of Output_data
2146 Output_segment::set_section_list_addresses(Output_data_list
* pdl
,
2147 uint64_t addr
, off_t
* poff
,
2148 unsigned int* pshndx
)
2150 off_t startoff
= *poff
;
2152 off_t off
= startoff
;
2153 for (Output_data_list::iterator p
= pdl
->begin();
2157 off
= align_address(off
, (*p
)->addralign());
2158 (*p
)->set_address_and_file_offset(addr
+ (off
- startoff
), off
);
2160 // Unless this is a PT_TLS segment, we want to ignore the size
2161 // of a SHF_TLS/SHT_NOBITS section. Such a section does not
2162 // affect the size of a PT_LOAD segment.
2163 if (this->type_
== elfcpp::PT_TLS
2164 || !(*p
)->is_section_flag_set(elfcpp::SHF_TLS
)
2165 || !(*p
)->is_section_type(elfcpp::SHT_NOBITS
))
2166 off
+= (*p
)->data_size();
2168 if ((*p
)->is_section())
2170 (*p
)->set_out_shndx(*pshndx
);
2176 return addr
+ (off
- startoff
);
2179 // For a non-PT_LOAD segment, set the offset from the sections, if
2183 Output_segment::set_offset()
2185 gold_assert(this->type_
!= elfcpp::PT_LOAD
);
2187 if (this->output_data_
.empty() && this->output_bss_
.empty())
2198 const Output_data
* first
;
2199 if (this->output_data_
.empty())
2200 first
= this->output_bss_
.front();
2202 first
= this->output_data_
.front();
2203 this->vaddr_
= first
->address();
2204 this->paddr_
= this->vaddr_
;
2205 this->offset_
= first
->offset();
2207 if (this->output_data_
.empty())
2211 const Output_data
* last_data
= this->output_data_
.back();
2212 this->filesz_
= (last_data
->address()
2213 + last_data
->data_size()
2217 const Output_data
* last
;
2218 if (this->output_bss_
.empty())
2219 last
= this->output_data_
.back();
2221 last
= this->output_bss_
.back();
2222 this->memsz_
= (last
->address()
2227 // Set the TLS offsets of the sections in the PT_TLS segment.
2230 Output_segment::set_tls_offsets()
2232 gold_assert(this->type_
== elfcpp::PT_TLS
);
2234 for (Output_data_list::iterator p
= this->output_data_
.begin();
2235 p
!= this->output_data_
.end();
2237 (*p
)->set_tls_offset(this->vaddr_
);
2239 for (Output_data_list::iterator p
= this->output_bss_
.begin();
2240 p
!= this->output_bss_
.end();
2242 (*p
)->set_tls_offset(this->vaddr_
);
2245 // Return the number of Output_sections in an Output_segment.
2248 Output_segment::output_section_count() const
2250 return (this->output_section_count_list(&this->output_data_
)
2251 + this->output_section_count_list(&this->output_bss_
));
2254 // Return the number of Output_sections in an Output_data_list.
2257 Output_segment::output_section_count_list(const Output_data_list
* pdl
) const
2259 unsigned int count
= 0;
2260 for (Output_data_list::const_iterator p
= pdl
->begin();
2264 if ((*p
)->is_section())
2270 // Write the segment data into *OPHDR.
2272 template<int size
, bool big_endian
>
2274 Output_segment::write_header(elfcpp::Phdr_write
<size
, big_endian
>* ophdr
)
2276 ophdr
->put_p_type(this->type_
);
2277 ophdr
->put_p_offset(this->offset_
);
2278 ophdr
->put_p_vaddr(this->vaddr_
);
2279 ophdr
->put_p_paddr(this->paddr_
);
2280 ophdr
->put_p_filesz(this->filesz_
);
2281 ophdr
->put_p_memsz(this->memsz_
);
2282 ophdr
->put_p_flags(this->flags_
);
2283 ophdr
->put_p_align(this->addralign());
2286 // Write the section headers into V.
2288 template<int size
, bool big_endian
>
2290 Output_segment::write_section_headers(const Layout
* layout
,
2291 const Stringpool
* secnamepool
,
2293 unsigned int *pshndx
2294 ACCEPT_SIZE_ENDIAN
) const
2296 // Every section that is attached to a segment must be attached to a
2297 // PT_LOAD segment, so we only write out section headers for PT_LOAD
2299 if (this->type_
!= elfcpp::PT_LOAD
)
2302 v
= this->write_section_headers_list
2303 SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
2304 layout
, secnamepool
, &this->output_data_
, v
, pshndx
2305 SELECT_SIZE_ENDIAN(size
, big_endian
));
2306 v
= this->write_section_headers_list
2307 SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
2308 layout
, secnamepool
, &this->output_bss_
, v
, pshndx
2309 SELECT_SIZE_ENDIAN(size
, big_endian
));
2313 template<int size
, bool big_endian
>
2315 Output_segment::write_section_headers_list(const Layout
* layout
,
2316 const Stringpool
* secnamepool
,
2317 const Output_data_list
* pdl
,
2319 unsigned int* pshndx
2320 ACCEPT_SIZE_ENDIAN
) const
2322 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2323 for (Output_data_list::const_iterator p
= pdl
->begin();
2327 if ((*p
)->is_section())
2329 const Output_section
* ps
= static_cast<const Output_section
*>(*p
);
2330 gold_assert(*pshndx
== ps
->out_shndx());
2331 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
2332 ps
->write_header(layout
, secnamepool
, &oshdr
);
2340 // Output_file methods.
2342 Output_file::Output_file(const General_options
& options
, Target
* target
)
2343 : options_(options
),
2345 name_(options
.output_file_name()),
2349 map_is_anonymous_(false)
2353 // Open the output file.
2356 Output_file::open(off_t file_size
)
2358 this->file_size_
= file_size
;
2360 // Unlink the file first; otherwise the open() may fail if the file
2361 // is busy (e.g. it's an executable that's currently being executed).
2363 // However, the linker may be part of a system where a zero-length
2364 // file is created for it to write to, with tight permissions (gcc
2365 // 2.95 did something like this). Unlinking the file would work
2366 // around those permission controls, so we only unlink if the file
2367 // has a non-zero size. We also unlink only regular files to avoid
2368 // trouble with directories/etc.
2370 // If we fail, continue; this command is merely a best-effort attempt
2371 // to improve the odds for open().
2373 // We let the name "-" mean "stdout"
2374 if (strcmp(this->name_
, "-") == 0)
2375 this->o_
= STDOUT_FILENO
;
2379 if (::stat(this->name_
, &s
) == 0 && s
.st_size
!= 0)
2380 unlink_if_ordinary(this->name_
);
2382 int mode
= parameters
->output_is_object() ? 0666 : 0777;
2383 int o
= ::open(this->name_
, O_RDWR
| O_CREAT
| O_TRUNC
, mode
);
2385 gold_fatal(_("%s: open: %s"), this->name_
, strerror(errno
));
2392 // Resize the output file.
2395 Output_file::resize(off_t file_size
)
2397 // If the mmap is mapping an anonymous memory buffer, this is easy:
2398 // just mremap to the new size. If it's mapping to a file, we want
2399 // to unmap to flush to the file, then remap after growing the file.
2400 if (this->map_is_anonymous_
)
2402 void* base
= ::mremap(this->base_
, this->file_size_
, file_size
,
2404 if (base
== MAP_FAILED
)
2405 gold_fatal(_("%s: mremap: %s"), this->name_
, strerror(errno
));
2406 this->base_
= static_cast<unsigned char*>(base
);
2407 this->file_size_
= file_size
;
2412 this->file_size_
= file_size
;
2417 // Map the file into memory.
2422 const int o
= this->o_
;
2424 // If the output file is not a regular file, don't try to mmap it;
2425 // instead, we'll mmap a block of memory (an anonymous buffer), and
2426 // then later write the buffer to the file.
2428 struct stat statbuf
;
2429 if (o
== STDOUT_FILENO
|| o
== STDERR_FILENO
2430 || ::fstat(o
, &statbuf
) != 0
2431 || !S_ISREG(statbuf
.st_mode
))
2433 this->map_is_anonymous_
= true;
2434 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
2435 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
2439 // Write out one byte to make the file the right size.
2440 if (::lseek(o
, this->file_size_
- 1, SEEK_SET
) < 0)
2441 gold_fatal(_("%s: lseek: %s"), this->name_
, strerror(errno
));
2443 if (::write(o
, &b
, 1) != 1)
2444 gold_fatal(_("%s: write: %s"), this->name_
, strerror(errno
));
2446 // Map the file into memory.
2447 this->map_is_anonymous_
= false;
2448 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
2451 if (base
== MAP_FAILED
)
2452 gold_fatal(_("%s: mmap: %s"), this->name_
, strerror(errno
));
2453 this->base_
= static_cast<unsigned char*>(base
);
2456 // Unmap the file from memory.
2459 Output_file::unmap()
2461 if (::munmap(this->base_
, this->file_size_
) < 0)
2462 gold_error(_("%s: munmap: %s"), this->name_
, strerror(errno
));
2466 // Close the output file.
2469 Output_file::close()
2471 // If the map isn't file-backed, we need to write it now.
2472 if (this->map_is_anonymous_
)
2474 size_t bytes_to_write
= this->file_size_
;
2475 while (bytes_to_write
> 0)
2477 ssize_t bytes_written
= ::write(this->o_
, this->base_
, bytes_to_write
);
2478 if (bytes_written
== 0)
2479 gold_error(_("%s: write: unexpected 0 return-value"), this->name_
);
2480 else if (bytes_written
< 0)
2481 gold_error(_("%s: write: %s"), this->name_
, strerror(errno
));
2483 bytes_to_write
-= bytes_written
;
2488 // We don't close stdout or stderr
2489 if (this->o_
!= STDOUT_FILENO
&& this->o_
!= STDERR_FILENO
)
2490 if (::close(this->o_
) < 0)
2491 gold_error(_("%s: close: %s"), this->name_
, strerror(errno
));
2495 // Instantiate the templates we need. We could use the configure
2496 // script to restrict this to only the ones for implemented targets.
2498 #ifdef HAVE_TARGET_32_LITTLE
2501 Output_section::add_input_section
<32, false>(
2502 Sized_relobj
<32, false>* object
,
2504 const char* secname
,
2505 const elfcpp::Shdr
<32, false>& shdr
,
2506 unsigned int reloc_shndx
);
2509 #ifdef HAVE_TARGET_32_BIG
2512 Output_section::add_input_section
<32, true>(
2513 Sized_relobj
<32, true>* object
,
2515 const char* secname
,
2516 const elfcpp::Shdr
<32, true>& shdr
,
2517 unsigned int reloc_shndx
);
2520 #ifdef HAVE_TARGET_64_LITTLE
2523 Output_section::add_input_section
<64, false>(
2524 Sized_relobj
<64, false>* object
,
2526 const char* secname
,
2527 const elfcpp::Shdr
<64, false>& shdr
,
2528 unsigned int reloc_shndx
);
2531 #ifdef HAVE_TARGET_64_BIG
2534 Output_section::add_input_section
<64, true>(
2535 Sized_relobj
<64, true>* object
,
2537 const char* secname
,
2538 const elfcpp::Shdr
<64, true>& shdr
,
2539 unsigned int reloc_shndx
);
2542 #ifdef HAVE_TARGET_32_LITTLE
2544 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, false>;
2547 #ifdef HAVE_TARGET_32_BIG
2549 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, true>;
2552 #ifdef HAVE_TARGET_64_LITTLE
2554 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, false>;
2557 #ifdef HAVE_TARGET_64_BIG
2559 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, true>;
2562 #ifdef HAVE_TARGET_32_LITTLE
2564 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false>;
2567 #ifdef HAVE_TARGET_32_BIG
2569 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, true>;
2572 #ifdef HAVE_TARGET_64_LITTLE
2574 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, false>;
2577 #ifdef HAVE_TARGET_64_BIG
2579 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, true>;
2582 #ifdef HAVE_TARGET_32_LITTLE
2584 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, false>;
2587 #ifdef HAVE_TARGET_32_BIG
2589 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, true>;
2592 #ifdef HAVE_TARGET_64_LITTLE
2594 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, false>;
2597 #ifdef HAVE_TARGET_64_BIG
2599 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, true>;
2602 #ifdef HAVE_TARGET_32_LITTLE
2604 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, false>;
2607 #ifdef HAVE_TARGET_32_BIG
2609 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, true>;
2612 #ifdef HAVE_TARGET_64_LITTLE
2614 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false>;
2617 #ifdef HAVE_TARGET_64_BIG
2619 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, true>;
2622 #ifdef HAVE_TARGET_32_LITTLE
2624 class Output_data_got
<32, false>;
2627 #ifdef HAVE_TARGET_32_BIG
2629 class Output_data_got
<32, true>;
2632 #ifdef HAVE_TARGET_64_LITTLE
2634 class Output_data_got
<64, false>;
2637 #ifdef HAVE_TARGET_64_BIG
2639 class Output_data_got
<64, true>;
2642 } // End namespace gold.