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(
516 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
519 this->u1_
.gsym
= gsym
;
522 gsym
->set_needs_dynsym_entry();
525 template<bool dynamic
, int size
, bool big_endian
>
526 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
532 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
535 gold_assert(shndx
!= INVALID_CODE
);
536 this->u1_
.gsym
= gsym
;
537 this->u2_
.relobj
= relobj
;
539 gsym
->set_needs_dynsym_entry();
542 // A reloc against a local symbol.
544 template<bool dynamic
, int size
, bool big_endian
>
545 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
546 Sized_relobj
<size
, big_endian
>* relobj
,
547 unsigned int local_sym_index
,
551 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
554 gold_assert(local_sym_index
!= GSYM_CODE
555 && local_sym_index
!= INVALID_CODE
);
556 this->u1_
.relobj
= relobj
;
558 if (dynamic
&& local_sym_index
> 0)
559 relobj
->set_needs_output_dynsym_entry(local_sym_index
);
562 template<bool dynamic
, int size
, bool big_endian
>
563 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
564 Sized_relobj
<size
, big_endian
>* relobj
,
565 unsigned int local_sym_index
,
569 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
572 gold_assert(local_sym_index
!= GSYM_CODE
573 && local_sym_index
!= INVALID_CODE
);
574 gold_assert(shndx
!= INVALID_CODE
);
575 this->u1_
.relobj
= relobj
;
576 this->u2_
.relobj
= relobj
;
577 if (dynamic
&& local_sym_index
> 0)
578 relobj
->set_needs_output_dynsym_entry(local_sym_index
);
581 // A reloc against the STT_SECTION symbol of an output section.
583 template<bool dynamic
, int size
, bool big_endian
>
584 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
589 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
595 os
->set_needs_dynsym_index();
598 template<bool dynamic
, int size
, bool big_endian
>
599 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
605 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
608 gold_assert(shndx
!= INVALID_CODE
);
610 this->u2_
.relobj
= relobj
;
612 os
->set_needs_dynsym_index();
615 // Get the symbol index of a relocation.
617 template<bool dynamic
, int size
, bool big_endian
>
619 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::get_symbol_index()
623 switch (this->local_sym_index_
)
629 if (this->u1_
.gsym
== NULL
)
632 index
= this->u1_
.gsym
->dynsym_index();
634 index
= this->u1_
.gsym
->symtab_index();
639 index
= this->u1_
.os
->dynsym_index();
641 index
= this->u1_
.os
->symtab_index();
645 // Relocations without symbols use a symbol index of 0.
651 index
= this->u1_
.relobj
->dynsym_index(this->local_sym_index_
);
653 index
= this->u1_
.relobj
->symtab_index(this->local_sym_index_
);
656 gold_assert(index
!= -1U);
660 // Write out the offset and info fields of a Rel or Rela relocation
663 template<bool dynamic
, int size
, bool big_endian
>
664 template<typename Write_rel
>
666 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write_rel(
669 Address address
= this->address_
;
670 if (this->shndx_
!= INVALID_CODE
)
673 Output_section
* os
= this->u2_
.relobj
->output_section(this->shndx_
,
675 gold_assert(os
!= NULL
);
677 address
+= os
->address() + off
;
680 address
= os
->output_address(this->u2_
.relobj
, this->shndx_
,
682 gold_assert(address
!= -1U);
685 else if (this->u2_
.od
!= NULL
)
686 address
+= this->u2_
.od
->address();
687 wr
->put_r_offset(address
);
688 wr
->put_r_info(elfcpp::elf_r_info
<size
>(this->get_symbol_index(),
692 // Write out a Rel relocation.
694 template<bool dynamic
, int size
, bool big_endian
>
696 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write(
697 unsigned char* pov
) const
699 elfcpp::Rel_write
<size
, big_endian
> orel(pov
);
700 this->write_rel(&orel
);
703 // Write out a Rela relocation.
705 template<bool dynamic
, int size
, bool big_endian
>
707 Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>::write(
708 unsigned char* pov
) const
710 elfcpp::Rela_write
<size
, big_endian
> orel(pov
);
711 this->rel_
.write_rel(&orel
);
712 orel
.put_r_addend(this->addend_
);
715 // Output_data_reloc_base methods.
717 // Adjust the output section.
719 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
721 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>
722 ::do_adjust_output_section(Output_section
* os
)
724 if (sh_type
== elfcpp::SHT_REL
)
725 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
726 else if (sh_type
== elfcpp::SHT_RELA
)
727 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
731 os
->set_should_link_to_dynsym();
733 os
->set_should_link_to_symtab();
736 // Write out relocation data.
738 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
740 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>::do_write(
743 const off_t off
= this->offset();
744 const off_t oview_size
= this->data_size();
745 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
747 unsigned char* pov
= oview
;
748 for (typename
Relocs::const_iterator p
= this->relocs_
.begin();
749 p
!= this->relocs_
.end();
756 gold_assert(pov
- oview
== oview_size
);
758 of
->write_output_view(off
, oview_size
, oview
);
760 // We no longer need the relocation entries.
761 this->relocs_
.clear();
764 // Output_data_got::Got_entry methods.
766 // Write out the entry.
768 template<int size
, bool big_endian
>
770 Output_data_got
<size
, big_endian
>::Got_entry::write(unsigned char* pov
) const
774 switch (this->local_sym_index_
)
778 Symbol
* gsym
= this->u_
.gsym
;
780 // If the symbol is resolved locally, we need to write out its
781 // value. Otherwise we just write zero. The target code is
782 // responsible for creating a relocation entry to fill in the
783 // value at runtime. For non-preemptible symbols in a shared
784 // library, the target will need to record whether or not the
785 // value should be written (e.g., it may use a RELATIVE
787 if (gsym
->final_value_is_known() || gsym
->needs_value_in_got())
789 Sized_symbol
<size
>* sgsym
;
790 // This cast is a bit ugly. We don't want to put a
791 // virtual method in Symbol, because we want Symbol to be
792 // as small as possible.
793 sgsym
= static_cast<Sized_symbol
<size
>*>(gsym
);
794 val
= sgsym
->value();
800 val
= this->u_
.constant
;
804 val
= this->u_
.object
->local_symbol_value(this->local_sym_index_
);
808 elfcpp::Swap
<size
, big_endian
>::writeval(pov
, val
);
811 // Output_data_got methods.
813 // Add an entry for a global symbol to the GOT. This returns true if
814 // this is a new GOT entry, false if the symbol already had a GOT
817 template<int size
, bool big_endian
>
819 Output_data_got
<size
, big_endian
>::add_global(Symbol
* gsym
)
821 if (gsym
->has_got_offset())
824 this->entries_
.push_back(Got_entry(gsym
));
825 this->set_got_size();
826 gsym
->set_got_offset(this->last_got_offset());
830 // Add an entry for a global symbol to the GOT, and add a dynamic
831 // relocation of type R_TYPE for the GOT entry.
832 template<int size
, bool big_endian
>
834 Output_data_got
<size
, big_endian
>::add_global_with_rel(
839 if (gsym
->has_got_offset())
842 this->entries_
.push_back(Got_entry());
843 this->set_got_size();
844 unsigned int got_offset
= this->last_got_offset();
845 gsym
->set_got_offset(got_offset
);
846 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
849 template<int size
, bool big_endian
>
851 Output_data_got
<size
, big_endian
>::add_global_with_rela(
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 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
866 // Add an entry for a local symbol to the GOT. This returns true if
867 // this is a new GOT entry, false if the symbol already has a GOT
870 template<int size
, bool big_endian
>
872 Output_data_got
<size
, big_endian
>::add_local(
873 Sized_relobj
<size
, big_endian
>* object
,
876 if (object
->local_has_got_offset(symndx
))
879 this->entries_
.push_back(Got_entry(object
, symndx
));
880 this->set_got_size();
881 object
->set_local_got_offset(symndx
, this->last_got_offset());
885 // Add an entry for a local symbol to the GOT, and add a dynamic
886 // relocation of type R_TYPE for the GOT entry.
887 template<int size
, bool big_endian
>
889 Output_data_got
<size
, big_endian
>::add_local_with_rel(
890 Sized_relobj
<size
, big_endian
>* object
,
895 if (object
->local_has_got_offset(symndx
))
898 this->entries_
.push_back(Got_entry());
899 this->set_got_size();
900 unsigned int got_offset
= this->last_got_offset();
901 object
->set_local_got_offset(symndx
, got_offset
);
902 rel_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
);
905 template<int size
, bool big_endian
>
907 Output_data_got
<size
, big_endian
>::add_local_with_rela(
908 Sized_relobj
<size
, big_endian
>* object
,
913 if (object
->local_has_got_offset(symndx
))
916 this->entries_
.push_back(Got_entry());
917 this->set_got_size();
918 unsigned int got_offset
= this->last_got_offset();
919 object
->set_local_got_offset(symndx
, got_offset
);
920 rela_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
, 0);
923 // Add an entry (or a pair of entries) for a global TLS symbol to the GOT.
924 // In a pair of entries, the first value in the pair will be used for the
925 // module index, and the second value will be used for the dtv-relative
926 // offset. This returns true if this is a new GOT entry, false if the symbol
927 // already has a GOT entry.
929 template<int size
, bool big_endian
>
931 Output_data_got
<size
, big_endian
>::add_global_tls(Symbol
* gsym
, bool need_pair
)
933 if (gsym
->has_tls_got_offset(need_pair
))
936 this->entries_
.push_back(Got_entry(gsym
));
937 gsym
->set_tls_got_offset(this->last_got_offset(), need_pair
);
939 this->entries_
.push_back(Got_entry(gsym
));
940 this->set_got_size();
944 // Add an entry for a global TLS symbol to the GOT, and add a dynamic
945 // relocation of type R_TYPE.
946 template<int size
, bool big_endian
>
948 Output_data_got
<size
, big_endian
>::add_global_tls_with_rel(
953 if (gsym
->has_tls_got_offset(false))
956 this->entries_
.push_back(Got_entry());
957 this->set_got_size();
958 unsigned int got_offset
= this->last_got_offset();
959 gsym
->set_tls_got_offset(got_offset
, false);
960 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
963 template<int size
, bool big_endian
>
965 Output_data_got
<size
, big_endian
>::add_global_tls_with_rela(
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 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
980 // Add a pair of entries for a global TLS symbol to the GOT, and add
981 // dynamic relocations of type MOD_R_TYPE and DTV_R_TYPE, respectively.
982 template<int size
, bool big_endian
>
984 Output_data_got
<size
, big_endian
>::add_global_tls_with_rel(
987 unsigned int mod_r_type
,
988 unsigned int dtv_r_type
)
990 if (gsym
->has_tls_got_offset(true))
993 this->entries_
.push_back(Got_entry());
994 unsigned int got_offset
= this->last_got_offset();
995 gsym
->set_tls_got_offset(got_offset
, true);
996 rel_dyn
->add_global(gsym
, mod_r_type
, this, got_offset
);
998 this->entries_
.push_back(Got_entry());
999 this->set_got_size();
1000 got_offset
= this->last_got_offset();
1001 rel_dyn
->add_global(gsym
, dtv_r_type
, this, got_offset
);
1004 template<int size
, bool big_endian
>
1006 Output_data_got
<size
, big_endian
>::add_global_tls_with_rela(
1009 unsigned int mod_r_type
,
1010 unsigned int dtv_r_type
)
1012 if (gsym
->has_tls_got_offset(true))
1015 this->entries_
.push_back(Got_entry());
1016 unsigned int got_offset
= this->last_got_offset();
1017 gsym
->set_tls_got_offset(got_offset
, true);
1018 rela_dyn
->add_global(gsym
, mod_r_type
, this, got_offset
, 0);
1020 this->entries_
.push_back(Got_entry());
1021 this->set_got_size();
1022 got_offset
= this->last_got_offset();
1023 rela_dyn
->add_global(gsym
, dtv_r_type
, this, got_offset
, 0);
1026 // Add an entry (or a pair of entries) for a local TLS symbol to the GOT.
1027 // In a pair of entries, the first value in the pair will be used for the
1028 // module index, and the second value will be used for the dtv-relative
1029 // offset. This returns true if this is a new GOT entry, false if the symbol
1030 // already has a GOT entry.
1032 template<int size
, bool big_endian
>
1034 Output_data_got
<size
, big_endian
>::add_local_tls(
1035 Sized_relobj
<size
, big_endian
>* object
,
1036 unsigned int symndx
,
1039 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1042 this->entries_
.push_back(Got_entry(object
, symndx
));
1043 object
->set_local_tls_got_offset(symndx
, this->last_got_offset(), need_pair
);
1045 this->entries_
.push_back(Got_entry(object
, symndx
));
1046 this->set_got_size();
1050 // Add an entry (or pair of entries) for a local TLS symbol to the GOT,
1051 // and add a dynamic relocation of type R_TYPE for the first GOT entry.
1052 // Because this is a local symbol, the first GOT entry can be relocated
1053 // relative to a section symbol, and the second GOT entry will have an
1054 // dtv-relative value that can be computed at link time.
1055 template<int size
, bool big_endian
>
1057 Output_data_got
<size
, big_endian
>::add_local_tls_with_rel(
1058 Sized_relobj
<size
, big_endian
>* object
,
1059 unsigned int symndx
,
1063 unsigned int r_type
)
1065 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1068 this->entries_
.push_back(Got_entry());
1069 unsigned int got_offset
= this->last_got_offset();
1070 object
->set_local_tls_got_offset(symndx
, got_offset
, need_pair
);
1072 Output_section
* os
= object
->output_section(shndx
, &off
);
1073 rel_dyn
->add_output_section(os
, r_type
, this, got_offset
);
1075 // The second entry of the pair will be statically initialized
1076 // with the TLS offset of the symbol.
1078 this->entries_
.push_back(Got_entry(object
, symndx
));
1080 this->set_got_size();
1083 template<int size
, bool big_endian
>
1085 Output_data_got
<size
, big_endian
>::add_local_tls_with_rela(
1086 Sized_relobj
<size
, big_endian
>* object
,
1087 unsigned int symndx
,
1091 unsigned int r_type
)
1093 if (object
->local_has_tls_got_offset(symndx
, need_pair
))
1096 this->entries_
.push_back(Got_entry());
1097 unsigned int got_offset
= this->last_got_offset();
1098 object
->set_local_tls_got_offset(symndx
, got_offset
, need_pair
);
1100 Output_section
* os
= object
->output_section(shndx
, &off
);
1101 rela_dyn
->add_output_section(os
, r_type
, this, got_offset
, 0);
1103 // The second entry of the pair will be statically initialized
1104 // with the TLS offset of the symbol.
1106 this->entries_
.push_back(Got_entry(object
, symndx
));
1108 this->set_got_size();
1111 // Write out the GOT.
1113 template<int size
, bool big_endian
>
1115 Output_data_got
<size
, big_endian
>::do_write(Output_file
* of
)
1117 const int add
= size
/ 8;
1119 const off_t off
= this->offset();
1120 const off_t oview_size
= this->data_size();
1121 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1123 unsigned char* pov
= oview
;
1124 for (typename
Got_entries::const_iterator p
= this->entries_
.begin();
1125 p
!= this->entries_
.end();
1132 gold_assert(pov
- oview
== oview_size
);
1134 of
->write_output_view(off
, oview_size
, oview
);
1136 // We no longer need the GOT entries.
1137 this->entries_
.clear();
1140 // Output_data_dynamic::Dynamic_entry methods.
1142 // Write out the entry.
1144 template<int size
, bool big_endian
>
1146 Output_data_dynamic::Dynamic_entry::write(
1148 const Stringpool
* pool
1149 ACCEPT_SIZE_ENDIAN
) const
1151 typename
elfcpp::Elf_types
<size
>::Elf_WXword val
;
1152 switch (this->classification_
)
1154 case DYNAMIC_NUMBER
:
1158 case DYNAMIC_SECTION_ADDRESS
:
1159 val
= this->u_
.od
->address();
1162 case DYNAMIC_SECTION_SIZE
:
1163 val
= this->u_
.od
->data_size();
1166 case DYNAMIC_SYMBOL
:
1168 const Sized_symbol
<size
>* s
=
1169 static_cast<const Sized_symbol
<size
>*>(this->u_
.sym
);
1174 case DYNAMIC_STRING
:
1175 val
= pool
->get_offset(this->u_
.str
);
1182 elfcpp::Dyn_write
<size
, big_endian
> dw(pov
);
1183 dw
.put_d_tag(this->tag_
);
1187 // Output_data_dynamic methods.
1189 // Adjust the output section to set the entry size.
1192 Output_data_dynamic::do_adjust_output_section(Output_section
* os
)
1194 if (parameters
->get_size() == 32)
1195 os
->set_entsize(elfcpp::Elf_sizes
<32>::dyn_size
);
1196 else if (parameters
->get_size() == 64)
1197 os
->set_entsize(elfcpp::Elf_sizes
<64>::dyn_size
);
1202 // Set the final data size.
1205 Output_data_dynamic::set_final_data_size()
1207 // Add the terminating entry.
1208 this->add_constant(elfcpp::DT_NULL
, 0);
1211 if (parameters
->get_size() == 32)
1212 dyn_size
= elfcpp::Elf_sizes
<32>::dyn_size
;
1213 else if (parameters
->get_size() == 64)
1214 dyn_size
= elfcpp::Elf_sizes
<64>::dyn_size
;
1217 this->set_data_size(this->entries_
.size() * dyn_size
);
1220 // Write out the dynamic entries.
1223 Output_data_dynamic::do_write(Output_file
* of
)
1225 if (parameters
->get_size() == 32)
1227 if (parameters
->is_big_endian())
1229 #ifdef HAVE_TARGET_32_BIG
1230 this->sized_write
<32, true>(of
);
1237 #ifdef HAVE_TARGET_32_LITTLE
1238 this->sized_write
<32, false>(of
);
1244 else if (parameters
->get_size() == 64)
1246 if (parameters
->is_big_endian())
1248 #ifdef HAVE_TARGET_64_BIG
1249 this->sized_write
<64, true>(of
);
1256 #ifdef HAVE_TARGET_64_LITTLE
1257 this->sized_write
<64, false>(of
);
1267 template<int size
, bool big_endian
>
1269 Output_data_dynamic::sized_write(Output_file
* of
)
1271 const int dyn_size
= elfcpp::Elf_sizes
<size
>::dyn_size
;
1273 const off_t offset
= this->offset();
1274 const off_t oview_size
= this->data_size();
1275 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1277 unsigned char* pov
= oview
;
1278 for (typename
Dynamic_entries::const_iterator p
= this->entries_
.begin();
1279 p
!= this->entries_
.end();
1282 p
->write
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1283 pov
, this->pool_
SELECT_SIZE_ENDIAN(size
, big_endian
));
1287 gold_assert(pov
- oview
== oview_size
);
1289 of
->write_output_view(offset
, oview_size
, oview
);
1291 // We no longer need the dynamic entries.
1292 this->entries_
.clear();
1295 // Output_section::Input_section methods.
1297 // Return the data size. For an input section we store the size here.
1298 // For an Output_section_data, we have to ask it for the size.
1301 Output_section::Input_section::data_size() const
1303 if (this->is_input_section())
1304 return this->u1_
.data_size
;
1306 return this->u2_
.posd
->data_size();
1309 // Set the address and file offset.
1312 Output_section::Input_section::set_address_and_file_offset(
1315 off_t section_file_offset
)
1317 if (this->is_input_section())
1318 this->u2_
.object
->set_section_offset(this->shndx_
,
1319 file_offset
- section_file_offset
);
1321 this->u2_
.posd
->set_address_and_file_offset(address
, file_offset
);
1324 // Finalize the data size.
1327 Output_section::Input_section::finalize_data_size()
1329 if (!this->is_input_section())
1330 this->u2_
.posd
->finalize_data_size();
1333 // Try to turn an input offset into an output offset.
1336 Output_section::Input_section::output_offset(const Relobj
* object
,
1339 off_t
*poutput
) const
1341 if (!this->is_input_section())
1342 return this->u2_
.posd
->output_offset(object
, shndx
, offset
, poutput
);
1345 if (this->shndx_
!= shndx
|| this->u2_
.object
!= object
)
1347 off_t output_offset
;
1348 Output_section
* os
= object
->output_section(shndx
, &output_offset
);
1349 gold_assert(os
!= NULL
);
1350 gold_assert(output_offset
!= -1);
1351 *poutput
= output_offset
+ offset
;
1356 // Write out the data. We don't have to do anything for an input
1357 // section--they are handled via Object::relocate--but this is where
1358 // we write out the data for an Output_section_data.
1361 Output_section::Input_section::write(Output_file
* of
)
1363 if (!this->is_input_section())
1364 this->u2_
.posd
->write(of
);
1367 // Write the data to a buffer. As for write(), we don't have to do
1368 // anything for an input section.
1371 Output_section::Input_section::write_to_buffer(unsigned char* buffer
)
1373 if (!this->is_input_section())
1374 this->u2_
.posd
->write_to_buffer(buffer
);
1377 // Output_section methods.
1379 // Construct an Output_section. NAME will point into a Stringpool.
1381 Output_section::Output_section(const char* name
, elfcpp::Elf_Word type
,
1382 elfcpp::Elf_Xword flags
)
1386 link_section_(NULL
),
1388 info_section_(NULL
),
1396 first_input_offset_(0),
1398 postprocessing_buffer_(NULL
),
1399 needs_symtab_index_(false),
1400 needs_dynsym_index_(false),
1401 should_link_to_symtab_(false),
1402 should_link_to_dynsym_(false),
1403 after_input_sections_(false),
1404 requires_postprocessing_(false),
1407 // An unallocated section has no address. Forcing this means that
1408 // we don't need special treatment for symbols defined in debug
1410 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
1411 this->set_address(0);
1414 Output_section::~Output_section()
1418 // Set the entry size.
1421 Output_section::set_entsize(uint64_t v
)
1423 if (this->entsize_
== 0)
1426 gold_assert(this->entsize_
== v
);
1429 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1430 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1431 // relocation section which applies to this section, or 0 if none, or
1432 // -1U if more than one. Return the offset of the input section
1433 // within the output section. Return -1 if the input section will
1434 // receive special handling. In the normal case we don't always keep
1435 // track of input sections for an Output_section. Instead, each
1436 // Object keeps track of the Output_section for each of its input
1439 template<int size
, bool big_endian
>
1441 Output_section::add_input_section(Sized_relobj
<size
, big_endian
>* object
,
1443 const char* secname
,
1444 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1445 unsigned int reloc_shndx
)
1447 elfcpp::Elf_Xword addralign
= shdr
.get_sh_addralign();
1448 if ((addralign
& (addralign
- 1)) != 0)
1450 object
->error(_("invalid alignment %lu for section \"%s\""),
1451 static_cast<unsigned long>(addralign
), secname
);
1455 if (addralign
> this->addralign_
)
1456 this->addralign_
= addralign
;
1458 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_flags
= shdr
.get_sh_flags();
1459 uint64_t entsize
= shdr
.get_sh_entsize();
1461 // .debug_str is a mergeable string section, but is not always so
1462 // marked by compilers. Mark manually here so we can optimize.
1463 if (strcmp(secname
, ".debug_str") == 0)
1465 sh_flags
|= (elfcpp::SHF_MERGE
| elfcpp::SHF_STRINGS
);
1469 // If this is a SHF_MERGE section, we pass all the input sections to
1470 // a Output_data_merge. We don't try to handle relocations for such
1472 if ((sh_flags
& elfcpp::SHF_MERGE
) != 0
1473 && reloc_shndx
== 0)
1475 if (this->add_merge_input_section(object
, shndx
, sh_flags
,
1476 entsize
, addralign
))
1478 // Tell the relocation routines that they need to call the
1479 // output_offset method to determine the final address.
1484 off_t offset_in_section
= this->current_data_size_for_child();
1485 off_t aligned_offset_in_section
= align_address(offset_in_section
,
1488 if (aligned_offset_in_section
> offset_in_section
1489 && (sh_flags
& elfcpp::SHF_EXECINSTR
) != 0
1490 && object
->target()->has_code_fill())
1492 // We need to add some fill data. Using fill_list_ when
1493 // possible is an optimization, since we will often have fill
1494 // sections without input sections.
1495 off_t fill_len
= aligned_offset_in_section
- offset_in_section
;
1496 if (this->input_sections_
.empty())
1497 this->fills_
.push_back(Fill(offset_in_section
, fill_len
));
1500 // FIXME: When relaxing, the size needs to adjust to
1501 // maintain a constant alignment.
1502 std::string
fill_data(object
->target()->code_fill(fill_len
));
1503 Output_data_const
* odc
= new Output_data_const(fill_data
, 1);
1504 this->input_sections_
.push_back(Input_section(odc
));
1508 this->set_current_data_size_for_child(aligned_offset_in_section
1509 + shdr
.get_sh_size());
1511 // We need to keep track of this section if we are already keeping
1512 // track of sections, or if we are relaxing. FIXME: Add test for
1514 if (!this->input_sections_
.empty())
1515 this->input_sections_
.push_back(Input_section(object
, shndx
,
1519 return aligned_offset_in_section
;
1522 // Add arbitrary data to an output section.
1525 Output_section::add_output_section_data(Output_section_data
* posd
)
1527 Input_section
inp(posd
);
1528 this->add_output_section_data(&inp
);
1531 // Add arbitrary data to an output section by Input_section.
1534 Output_section::add_output_section_data(Input_section
* inp
)
1536 if (this->input_sections_
.empty())
1537 this->first_input_offset_
= this->current_data_size_for_child();
1539 this->input_sections_
.push_back(*inp
);
1541 uint64_t addralign
= inp
->addralign();
1542 if (addralign
> this->addralign_
)
1543 this->addralign_
= addralign
;
1545 inp
->set_output_section(this);
1548 // Add a merge section to an output section.
1551 Output_section::add_output_merge_section(Output_section_data
* posd
,
1552 bool is_string
, uint64_t entsize
)
1554 Input_section
inp(posd
, is_string
, entsize
);
1555 this->add_output_section_data(&inp
);
1558 // Add an input section to a SHF_MERGE section.
1561 Output_section::add_merge_input_section(Relobj
* object
, unsigned int shndx
,
1562 uint64_t flags
, uint64_t entsize
,
1565 bool is_string
= (flags
& elfcpp::SHF_STRINGS
) != 0;
1567 // We only merge strings if the alignment is not more than the
1568 // character size. This could be handled, but it's unusual.
1569 if (is_string
&& addralign
> entsize
)
1572 Input_section_list::iterator p
;
1573 for (p
= this->input_sections_
.begin();
1574 p
!= this->input_sections_
.end();
1576 if (p
->is_merge_section(is_string
, entsize
, addralign
))
1578 p
->add_input_section(object
, shndx
);
1582 // We handle the actual constant merging in Output_merge_data or
1583 // Output_merge_string_data.
1584 Output_section_data
* posd
;
1586 posd
= new Output_merge_data(entsize
, addralign
);
1592 posd
= new Output_merge_string
<char>(addralign
);
1595 posd
= new Output_merge_string
<uint16_t>(addralign
);
1598 posd
= new Output_merge_string
<uint32_t>(addralign
);
1605 this->add_output_merge_section(posd
, is_string
, entsize
);
1606 posd
->add_input_section(object
, shndx
);
1611 // Given an address OFFSET relative to the start of input section
1612 // SHNDX in OBJECT, return whether this address is being included in
1613 // the final link. This should only be called if SHNDX in OBJECT has
1614 // a special mapping.
1617 Output_section::is_input_address_mapped(const Relobj
* object
,
1621 gold_assert(object
->is_section_specially_mapped(shndx
));
1623 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1624 p
!= this->input_sections_
.end();
1627 off_t output_offset
;
1628 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1629 return output_offset
!= -1;
1632 // By default we assume that the address is mapped. This should
1633 // only be called after we have passed all sections to Layout. At
1634 // that point we should know what we are discarding.
1638 // Given an address OFFSET relative to the start of input section
1639 // SHNDX in object OBJECT, return the output offset relative to the
1640 // start of the section. This should only be called if SHNDX in
1641 // OBJECT has a special mapping.
1644 Output_section::output_offset(const Relobj
* object
, unsigned int shndx
,
1647 gold_assert(object
->is_section_specially_mapped(shndx
));
1648 // This can only be called meaningfully when layout is complete.
1649 gold_assert(Output_data::is_layout_complete());
1651 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1652 p
!= this->input_sections_
.end();
1655 off_t output_offset
;
1656 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1657 return output_offset
;
1662 // Return the output virtual address of OFFSET relative to the start
1663 // of input section SHNDX in object OBJECT.
1666 Output_section::output_address(const Relobj
* object
, unsigned int shndx
,
1669 gold_assert(object
->is_section_specially_mapped(shndx
));
1670 // This can only be called meaningfully when layout is complete.
1671 gold_assert(Output_data::is_layout_complete());
1673 uint64_t addr
= this->address() + this->first_input_offset_
;
1674 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1675 p
!= this->input_sections_
.end();
1678 addr
= align_address(addr
, p
->addralign());
1679 off_t output_offset
;
1680 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1682 if (output_offset
== -1)
1684 return addr
+ output_offset
;
1686 addr
+= p
->data_size();
1689 // If we get here, it means that we don't know the mapping for this
1690 // input section. This might happen in principle if
1691 // add_input_section were called before add_output_section_data.
1692 // But it should never actually happen.
1697 // Set the data size of an Output_section. This is where we handle
1698 // setting the addresses of any Output_section_data objects.
1701 Output_section::set_final_data_size()
1703 if (this->input_sections_
.empty())
1705 this->set_data_size(this->current_data_size_for_child());
1709 uint64_t address
= this->address();
1710 off_t startoff
= this->offset();
1711 off_t off
= startoff
+ this->first_input_offset_
;
1712 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1713 p
!= this->input_sections_
.end();
1716 off
= align_address(off
, p
->addralign());
1717 p
->set_address_and_file_offset(address
+ (off
- startoff
), off
,
1719 off
+= p
->data_size();
1722 this->set_data_size(off
- startoff
);
1725 // Set the TLS offset. Called only for SHT_TLS sections.
1728 Output_section::do_set_tls_offset(uint64_t tls_base
)
1730 this->tls_offset_
= this->address() - tls_base
;
1733 // Write the section header to *OSHDR.
1735 template<int size
, bool big_endian
>
1737 Output_section::write_header(const Layout
* layout
,
1738 const Stringpool
* secnamepool
,
1739 elfcpp::Shdr_write
<size
, big_endian
>* oshdr
) const
1741 oshdr
->put_sh_name(secnamepool
->get_offset(this->name_
));
1742 oshdr
->put_sh_type(this->type_
);
1743 oshdr
->put_sh_flags(this->flags_
);
1744 oshdr
->put_sh_addr(this->address());
1745 oshdr
->put_sh_offset(this->offset());
1746 oshdr
->put_sh_size(this->data_size());
1747 if (this->link_section_
!= NULL
)
1748 oshdr
->put_sh_link(this->link_section_
->out_shndx());
1749 else if (this->should_link_to_symtab_
)
1750 oshdr
->put_sh_link(layout
->symtab_section()->out_shndx());
1751 else if (this->should_link_to_dynsym_
)
1752 oshdr
->put_sh_link(layout
->dynsym_section()->out_shndx());
1754 oshdr
->put_sh_link(this->link_
);
1755 if (this->info_section_
!= NULL
)
1756 oshdr
->put_sh_info(this->info_section_
->out_shndx());
1758 oshdr
->put_sh_info(this->info_
);
1759 oshdr
->put_sh_addralign(this->addralign_
);
1760 oshdr
->put_sh_entsize(this->entsize_
);
1763 // Write out the data. For input sections the data is written out by
1764 // Object::relocate, but we have to handle Output_section_data objects
1768 Output_section::do_write(Output_file
* of
)
1770 gold_assert(!this->requires_postprocessing());
1772 off_t output_section_file_offset
= this->offset();
1773 for (Fill_list::iterator p
= this->fills_
.begin();
1774 p
!= this->fills_
.end();
1777 std::string
fill_data(of
->target()->code_fill(p
->length()));
1778 of
->write(output_section_file_offset
+ p
->section_offset(),
1779 fill_data
.data(), fill_data
.size());
1782 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1783 p
!= this->input_sections_
.end();
1788 // If a section requires postprocessing, create the buffer to use.
1791 Output_section::create_postprocessing_buffer()
1793 gold_assert(this->requires_postprocessing());
1794 gold_assert(this->postprocessing_buffer_
== NULL
);
1796 if (!this->input_sections_
.empty())
1798 off_t off
= this->first_input_offset_
;
1799 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1800 p
!= this->input_sections_
.end();
1803 off
= align_address(off
, p
->addralign());
1804 p
->finalize_data_size();
1805 off
+= p
->data_size();
1807 this->set_current_data_size_for_child(off
);
1810 off_t buffer_size
= this->current_data_size_for_child();
1811 this->postprocessing_buffer_
= new unsigned char[buffer_size
];
1814 // Write all the data of an Output_section into the postprocessing
1815 // buffer. This is used for sections which require postprocessing,
1816 // such as compression. Input sections are handled by
1817 // Object::Relocate.
1820 Output_section::write_to_postprocessing_buffer()
1822 gold_assert(this->requires_postprocessing());
1824 Target
* target
= parameters
->target();
1825 unsigned char* buffer
= this->postprocessing_buffer();
1826 for (Fill_list::iterator p
= this->fills_
.begin();
1827 p
!= this->fills_
.end();
1830 std::string
fill_data(target
->code_fill(p
->length()));
1831 memcpy(buffer
+ p
->section_offset(), fill_data
.data(), fill_data
.size());
1834 off_t off
= this->first_input_offset_
;
1835 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1836 p
!= this->input_sections_
.end();
1839 off
= align_address(off
, p
->addralign());
1840 p
->write_to_buffer(buffer
+ off
);
1841 off
+= p
->data_size();
1845 // Output segment methods.
1847 Output_segment::Output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
1858 is_align_known_(false)
1862 // Add an Output_section to an Output_segment.
1865 Output_segment::add_output_section(Output_section
* os
,
1866 elfcpp::Elf_Word seg_flags
,
1869 gold_assert((os
->flags() & elfcpp::SHF_ALLOC
) != 0);
1870 gold_assert(!this->is_align_known_
);
1872 // Update the segment flags.
1873 this->flags_
|= seg_flags
;
1875 Output_segment::Output_data_list
* pdl
;
1876 if (os
->type() == elfcpp::SHT_NOBITS
)
1877 pdl
= &this->output_bss_
;
1879 pdl
= &this->output_data_
;
1881 // So that PT_NOTE segments will work correctly, we need to ensure
1882 // that all SHT_NOTE sections are adjacent. This will normally
1883 // happen automatically, because all the SHT_NOTE input sections
1884 // will wind up in the same output section. However, it is possible
1885 // for multiple SHT_NOTE input sections to have different section
1886 // flags, and thus be in different output sections, but for the
1887 // different section flags to map into the same segment flags and
1888 // thus the same output segment.
1890 // Note that while there may be many input sections in an output
1891 // section, there are normally only a few output sections in an
1892 // output segment. This loop is expected to be fast.
1894 if (os
->type() == elfcpp::SHT_NOTE
&& !pdl
->empty())
1896 Output_segment::Output_data_list::iterator p
= pdl
->end();
1900 if ((*p
)->is_section_type(elfcpp::SHT_NOTE
))
1902 // We don't worry about the FRONT parameter.
1908 while (p
!= pdl
->begin());
1911 // Similarly, so that PT_TLS segments will work, we need to group
1912 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
1913 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
1914 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
1915 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
1916 // and the PT_TLS segment -- we do this grouping only for the
1918 if (this->type_
!= elfcpp::PT_TLS
1919 && (os
->flags() & elfcpp::SHF_TLS
) != 0
1920 && !this->output_data_
.empty())
1922 pdl
= &this->output_data_
;
1923 bool nobits
= os
->type() == elfcpp::SHT_NOBITS
;
1924 bool sawtls
= false;
1925 Output_segment::Output_data_list::iterator p
= pdl
->end();
1930 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
1933 // Put a NOBITS section after the first TLS section.
1934 // But a PROGBITS section after the first TLS/PROGBITS
1936 insert
= nobits
|| !(*p
)->is_section_type(elfcpp::SHT_NOBITS
);
1940 // If we've gone past the TLS sections, but we've seen a
1941 // TLS section, then we need to insert this section now.
1947 // We don't worry about the FRONT parameter.
1953 while (p
!= pdl
->begin());
1955 // There are no TLS sections yet; put this one at the requested
1956 // location in the section list.
1960 pdl
->push_front(os
);
1965 // Add an Output_data (which is not an Output_section) to the start of
1969 Output_segment::add_initial_output_data(Output_data
* od
)
1971 gold_assert(!this->is_align_known_
);
1972 this->output_data_
.push_front(od
);
1975 // Return the maximum alignment of the Output_data in Output_segment.
1976 // Once we compute this, we prohibit new sections from being added.
1979 Output_segment::addralign()
1981 if (!this->is_align_known_
)
1985 addralign
= Output_segment::maximum_alignment(&this->output_data_
);
1986 if (addralign
> this->align_
)
1987 this->align_
= addralign
;
1989 addralign
= Output_segment::maximum_alignment(&this->output_bss_
);
1990 if (addralign
> this->align_
)
1991 this->align_
= addralign
;
1993 this->is_align_known_
= true;
1996 return this->align_
;
1999 // Return the maximum alignment of a list of Output_data.
2002 Output_segment::maximum_alignment(const Output_data_list
* pdl
)
2005 for (Output_data_list::const_iterator p
= pdl
->begin();
2009 uint64_t addralign
= (*p
)->addralign();
2010 if (addralign
> ret
)
2016 // Return the number of dynamic relocs applied to this segment.
2019 Output_segment::dynamic_reloc_count() const
2021 return (this->dynamic_reloc_count_list(&this->output_data_
)
2022 + this->dynamic_reloc_count_list(&this->output_bss_
));
2025 // Return the number of dynamic relocs applied to an Output_data_list.
2028 Output_segment::dynamic_reloc_count_list(const Output_data_list
* pdl
) const
2030 unsigned int count
= 0;
2031 for (Output_data_list::const_iterator p
= pdl
->begin();
2034 count
+= (*p
)->dynamic_reloc_count();
2038 // Set the section addresses for an Output_segment. ADDR is the
2039 // address and *POFF is the file offset. Set the section indexes
2040 // starting with *PSHNDX. Return the address of the immediately
2041 // following segment. Update *POFF and *PSHNDX.
2044 Output_segment::set_section_addresses(uint64_t addr
, off_t
* poff
,
2045 unsigned int* pshndx
)
2047 gold_assert(this->type_
== elfcpp::PT_LOAD
);
2049 this->vaddr_
= addr
;
2050 this->paddr_
= addr
;
2052 off_t orig_off
= *poff
;
2053 this->offset_
= orig_off
;
2055 *poff
= align_address(*poff
, this->addralign());
2057 addr
= this->set_section_list_addresses(&this->output_data_
, addr
, poff
,
2059 this->filesz_
= *poff
- orig_off
;
2063 uint64_t ret
= this->set_section_list_addresses(&this->output_bss_
, addr
,
2065 this->memsz_
= *poff
- orig_off
;
2067 // Ignore the file offset adjustments made by the BSS Output_data
2074 // Set the addresses and file offsets in a list of Output_data
2078 Output_segment::set_section_list_addresses(Output_data_list
* pdl
,
2079 uint64_t addr
, off_t
* poff
,
2080 unsigned int* pshndx
)
2082 off_t startoff
= *poff
;
2084 off_t off
= startoff
;
2085 for (Output_data_list::iterator p
= pdl
->begin();
2089 off
= align_address(off
, (*p
)->addralign());
2090 (*p
)->set_address_and_file_offset(addr
+ (off
- startoff
), off
);
2092 // Unless this is a PT_TLS segment, we want to ignore the size
2093 // of a SHF_TLS/SHT_NOBITS section. Such a section does not
2094 // affect the size of a PT_LOAD segment.
2095 if (this->type_
== elfcpp::PT_TLS
2096 || !(*p
)->is_section_flag_set(elfcpp::SHF_TLS
)
2097 || !(*p
)->is_section_type(elfcpp::SHT_NOBITS
))
2098 off
+= (*p
)->data_size();
2100 if ((*p
)->is_section())
2102 (*p
)->set_out_shndx(*pshndx
);
2108 return addr
+ (off
- startoff
);
2111 // For a non-PT_LOAD segment, set the offset from the sections, if
2115 Output_segment::set_offset()
2117 gold_assert(this->type_
!= elfcpp::PT_LOAD
);
2119 if (this->output_data_
.empty() && this->output_bss_
.empty())
2130 const Output_data
* first
;
2131 if (this->output_data_
.empty())
2132 first
= this->output_bss_
.front();
2134 first
= this->output_data_
.front();
2135 this->vaddr_
= first
->address();
2136 this->paddr_
= this->vaddr_
;
2137 this->offset_
= first
->offset();
2139 if (this->output_data_
.empty())
2143 const Output_data
* last_data
= this->output_data_
.back();
2144 this->filesz_
= (last_data
->address()
2145 + last_data
->data_size()
2149 const Output_data
* last
;
2150 if (this->output_bss_
.empty())
2151 last
= this->output_data_
.back();
2153 last
= this->output_bss_
.back();
2154 this->memsz_
= (last
->address()
2159 // Set the TLS offsets of the sections in the PT_TLS segment.
2162 Output_segment::set_tls_offsets()
2164 gold_assert(this->type_
== elfcpp::PT_TLS
);
2166 for (Output_data_list::iterator p
= this->output_data_
.begin();
2167 p
!= this->output_data_
.end();
2169 (*p
)->set_tls_offset(this->vaddr_
);
2171 for (Output_data_list::iterator p
= this->output_bss_
.begin();
2172 p
!= this->output_bss_
.end();
2174 (*p
)->set_tls_offset(this->vaddr_
);
2177 // Return the number of Output_sections in an Output_segment.
2180 Output_segment::output_section_count() const
2182 return (this->output_section_count_list(&this->output_data_
)
2183 + this->output_section_count_list(&this->output_bss_
));
2186 // Return the number of Output_sections in an Output_data_list.
2189 Output_segment::output_section_count_list(const Output_data_list
* pdl
) const
2191 unsigned int count
= 0;
2192 for (Output_data_list::const_iterator p
= pdl
->begin();
2196 if ((*p
)->is_section())
2202 // Write the segment data into *OPHDR.
2204 template<int size
, bool big_endian
>
2206 Output_segment::write_header(elfcpp::Phdr_write
<size
, big_endian
>* ophdr
)
2208 ophdr
->put_p_type(this->type_
);
2209 ophdr
->put_p_offset(this->offset_
);
2210 ophdr
->put_p_vaddr(this->vaddr_
);
2211 ophdr
->put_p_paddr(this->paddr_
);
2212 ophdr
->put_p_filesz(this->filesz_
);
2213 ophdr
->put_p_memsz(this->memsz_
);
2214 ophdr
->put_p_flags(this->flags_
);
2215 ophdr
->put_p_align(this->addralign());
2218 // Write the section headers into V.
2220 template<int size
, bool big_endian
>
2222 Output_segment::write_section_headers(const Layout
* layout
,
2223 const Stringpool
* secnamepool
,
2225 unsigned int *pshndx
2226 ACCEPT_SIZE_ENDIAN
) const
2228 // Every section that is attached to a segment must be attached to a
2229 // PT_LOAD segment, so we only write out section headers for PT_LOAD
2231 if (this->type_
!= elfcpp::PT_LOAD
)
2234 v
= this->write_section_headers_list
2235 SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
2236 layout
, secnamepool
, &this->output_data_
, v
, pshndx
2237 SELECT_SIZE_ENDIAN(size
, big_endian
));
2238 v
= this->write_section_headers_list
2239 SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
2240 layout
, secnamepool
, &this->output_bss_
, v
, pshndx
2241 SELECT_SIZE_ENDIAN(size
, big_endian
));
2245 template<int size
, bool big_endian
>
2247 Output_segment::write_section_headers_list(const Layout
* layout
,
2248 const Stringpool
* secnamepool
,
2249 const Output_data_list
* pdl
,
2251 unsigned int* pshndx
2252 ACCEPT_SIZE_ENDIAN
) const
2254 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2255 for (Output_data_list::const_iterator p
= pdl
->begin();
2259 if ((*p
)->is_section())
2261 const Output_section
* ps
= static_cast<const Output_section
*>(*p
);
2262 gold_assert(*pshndx
== ps
->out_shndx());
2263 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
2264 ps
->write_header(layout
, secnamepool
, &oshdr
);
2272 // Output_file methods.
2274 Output_file::Output_file(const General_options
& options
, Target
* target
)
2275 : options_(options
),
2277 name_(options
.output_file_name()),
2281 map_is_anonymous_(false)
2285 // Open the output file.
2288 Output_file::open(off_t file_size
)
2290 this->file_size_
= file_size
;
2292 // Unlink the file first; otherwise the open() may fail if the file
2293 // is busy (e.g. it's an executable that's currently being executed).
2295 // However, the linker may be part of a system where a zero-length
2296 // file is created for it to write to, with tight permissions (gcc
2297 // 2.95 did something like this). Unlinking the file would work
2298 // around those permission controls, so we only unlink if the file
2299 // has a non-zero size. We also unlink only regular files to avoid
2300 // trouble with directories/etc.
2302 // If we fail, continue; this command is merely a best-effort attempt
2303 // to improve the odds for open().
2305 // We let the name "-" mean "stdout"
2306 if (strcmp(this->name_
, "-") == 0)
2307 this->o_
= STDOUT_FILENO
;
2311 if (::stat(this->name_
, &s
) == 0 && s
.st_size
!= 0)
2312 unlink_if_ordinary(this->name_
);
2314 int mode
= parameters
->output_is_object() ? 0666 : 0777;
2315 int o
= ::open(this->name_
, O_RDWR
| O_CREAT
| O_TRUNC
, mode
);
2317 gold_fatal(_("%s: open: %s"), this->name_
, strerror(errno
));
2324 // Resize the output file.
2327 Output_file::resize(off_t file_size
)
2329 // If the mmap is mapping an anonymous memory buffer, this is easy:
2330 // just mremap to the new size. If it's mapping to a file, we want
2331 // to unmap to flush to the file, then remap after growing the file.
2332 if (this->map_is_anonymous_
)
2334 void* base
= ::mremap(this->base_
, this->file_size_
, file_size
,
2336 if (base
== MAP_FAILED
)
2337 gold_fatal(_("%s: mremap: %s"), this->name_
, strerror(errno
));
2338 this->base_
= static_cast<unsigned char*>(base
);
2339 this->file_size_
= file_size
;
2344 this->file_size_
= file_size
;
2349 // Map the file into memory.
2354 const int o
= this->o_
;
2356 // If the output file is not a regular file, don't try to mmap it;
2357 // instead, we'll mmap a block of memory (an anonymous buffer), and
2358 // then later write the buffer to the file.
2360 struct stat statbuf
;
2361 if (o
== STDOUT_FILENO
|| o
== STDERR_FILENO
2362 || ::fstat(o
, &statbuf
) != 0
2363 || !S_ISREG(statbuf
.st_mode
))
2365 this->map_is_anonymous_
= true;
2366 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
2367 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
2371 // Write out one byte to make the file the right size.
2372 if (::lseek(o
, this->file_size_
- 1, SEEK_SET
) < 0)
2373 gold_fatal(_("%s: lseek: %s"), this->name_
, strerror(errno
));
2375 if (::write(o
, &b
, 1) != 1)
2376 gold_fatal(_("%s: write: %s"), this->name_
, strerror(errno
));
2378 // Map the file into memory.
2379 this->map_is_anonymous_
= false;
2380 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
2383 if (base
== MAP_FAILED
)
2384 gold_fatal(_("%s: mmap: %s"), this->name_
, strerror(errno
));
2385 this->base_
= static_cast<unsigned char*>(base
);
2388 // Unmap the file from memory.
2391 Output_file::unmap()
2393 if (::munmap(this->base_
, this->file_size_
) < 0)
2394 gold_error(_("%s: munmap: %s"), this->name_
, strerror(errno
));
2398 // Close the output file.
2401 Output_file::close()
2403 // If the map isn't file-backed, we need to write it now.
2404 if (this->map_is_anonymous_
)
2406 size_t bytes_to_write
= this->file_size_
;
2407 while (bytes_to_write
> 0)
2409 ssize_t bytes_written
= ::write(this->o_
, this->base_
, bytes_to_write
);
2410 if (bytes_written
== 0)
2411 gold_error(_("%s: write: unexpected 0 return-value"), this->name_
);
2412 else if (bytes_written
< 0)
2413 gold_error(_("%s: write: %s"), this->name_
, strerror(errno
));
2415 bytes_to_write
-= bytes_written
;
2420 // We don't close stdout or stderr
2421 if (this->o_
!= STDOUT_FILENO
&& this->o_
!= STDERR_FILENO
)
2422 if (::close(this->o_
) < 0)
2423 gold_error(_("%s: close: %s"), this->name_
, strerror(errno
));
2427 // Instantiate the templates we need. We could use the configure
2428 // script to restrict this to only the ones for implemented targets.
2430 #ifdef HAVE_TARGET_32_LITTLE
2433 Output_section::add_input_section
<32, false>(
2434 Sized_relobj
<32, false>* object
,
2436 const char* secname
,
2437 const elfcpp::Shdr
<32, false>& shdr
,
2438 unsigned int reloc_shndx
);
2441 #ifdef HAVE_TARGET_32_BIG
2444 Output_section::add_input_section
<32, true>(
2445 Sized_relobj
<32, true>* object
,
2447 const char* secname
,
2448 const elfcpp::Shdr
<32, true>& shdr
,
2449 unsigned int reloc_shndx
);
2452 #ifdef HAVE_TARGET_64_LITTLE
2455 Output_section::add_input_section
<64, false>(
2456 Sized_relobj
<64, false>* object
,
2458 const char* secname
,
2459 const elfcpp::Shdr
<64, false>& shdr
,
2460 unsigned int reloc_shndx
);
2463 #ifdef HAVE_TARGET_64_BIG
2466 Output_section::add_input_section
<64, true>(
2467 Sized_relobj
<64, true>* object
,
2469 const char* secname
,
2470 const elfcpp::Shdr
<64, true>& shdr
,
2471 unsigned int reloc_shndx
);
2474 #ifdef HAVE_TARGET_32_LITTLE
2476 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, false>;
2479 #ifdef HAVE_TARGET_32_BIG
2481 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, true>;
2484 #ifdef HAVE_TARGET_64_LITTLE
2486 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, false>;
2489 #ifdef HAVE_TARGET_64_BIG
2491 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, true>;
2494 #ifdef HAVE_TARGET_32_LITTLE
2496 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false>;
2499 #ifdef HAVE_TARGET_32_BIG
2501 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, true>;
2504 #ifdef HAVE_TARGET_64_LITTLE
2506 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, false>;
2509 #ifdef HAVE_TARGET_64_BIG
2511 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, true>;
2514 #ifdef HAVE_TARGET_32_LITTLE
2516 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, false>;
2519 #ifdef HAVE_TARGET_32_BIG
2521 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, true>;
2524 #ifdef HAVE_TARGET_64_LITTLE
2526 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, false>;
2529 #ifdef HAVE_TARGET_64_BIG
2531 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, true>;
2534 #ifdef HAVE_TARGET_32_LITTLE
2536 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, false>;
2539 #ifdef HAVE_TARGET_32_BIG
2541 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, true>;
2544 #ifdef HAVE_TARGET_64_LITTLE
2546 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false>;
2549 #ifdef HAVE_TARGET_64_BIG
2551 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, true>;
2554 #ifdef HAVE_TARGET_32_LITTLE
2556 class Output_data_got
<32, false>;
2559 #ifdef HAVE_TARGET_32_BIG
2561 class Output_data_got
<32, true>;
2564 #ifdef HAVE_TARGET_64_LITTLE
2566 class Output_data_got
<64, false>;
2569 #ifdef HAVE_TARGET_64_BIG
2571 class Output_data_got
<64, true>;
2574 } // End namespace gold.