1 // output.cc -- manage the output file for gold
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
33 #include "libiberty.h" // for unlink_if_ordinary()
35 #include "parameters.h"
42 // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
44 # define MAP_ANONYMOUS MAP_ANON
50 // Output_data variables.
52 bool Output_data::allocated_sizes_are_fixed
;
54 // Output_data methods.
56 Output_data::~Output_data()
60 // Return the default alignment for the target size.
63 Output_data::default_alignment()
65 return Output_data::default_alignment_for_size(
66 parameters
->target().get_size());
69 // Return the default alignment for a size--32 or 64.
72 Output_data::default_alignment_for_size(int size
)
82 // Output_section_header methods. This currently assumes that the
83 // segment and section lists are complete at construction time.
85 Output_section_headers::Output_section_headers(
87 const Layout::Segment_list
* segment_list
,
88 const Layout::Section_list
* section_list
,
89 const Layout::Section_list
* unattached_section_list
,
90 const Stringpool
* secnamepool
)
92 segment_list_(segment_list
),
93 section_list_(section_list
),
94 unattached_section_list_(unattached_section_list
),
95 secnamepool_(secnamepool
)
97 // Count all the sections. Start with 1 for the null section.
99 if (!parameters
->options().relocatable())
101 for (Layout::Segment_list::const_iterator p
= segment_list
->begin();
102 p
!= segment_list
->end();
104 if ((*p
)->type() == elfcpp::PT_LOAD
)
105 count
+= (*p
)->output_section_count();
109 for (Layout::Section_list::const_iterator p
= section_list
->begin();
110 p
!= section_list
->end();
112 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0)
115 count
+= unattached_section_list
->size();
117 const int size
= parameters
->target().get_size();
120 shdr_size
= elfcpp::Elf_sizes
<32>::shdr_size
;
122 shdr_size
= elfcpp::Elf_sizes
<64>::shdr_size
;
126 this->set_data_size(count
* shdr_size
);
129 // Write out the section headers.
132 Output_section_headers::do_write(Output_file
* of
)
134 switch (parameters
->size_and_endianness())
136 #ifdef HAVE_TARGET_32_LITTLE
137 case Parameters::TARGET_32_LITTLE
:
138 this->do_sized_write
<32, false>(of
);
141 #ifdef HAVE_TARGET_32_BIG
142 case Parameters::TARGET_32_BIG
:
143 this->do_sized_write
<32, true>(of
);
146 #ifdef HAVE_TARGET_64_LITTLE
147 case Parameters::TARGET_64_LITTLE
:
148 this->do_sized_write
<64, false>(of
);
151 #ifdef HAVE_TARGET_64_BIG
152 case Parameters::TARGET_64_BIG
:
153 this->do_sized_write
<64, true>(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);
187 unsigned int shndx
= 1;
188 if (!parameters
->options().relocatable())
190 for (Layout::Segment_list::const_iterator p
=
191 this->segment_list_
->begin();
192 p
!= this->segment_list_
->end();
194 v
= (*p
)->write_section_headers
<size
, big_endian
>(this->layout_
,
201 for (Layout::Section_list::const_iterator p
=
202 this->section_list_
->begin();
203 p
!= this->section_list_
->end();
206 // We do unallocated sections below, except that group
207 // sections have to come first.
208 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) == 0
209 && (*p
)->type() != elfcpp::SHT_GROUP
)
211 gold_assert(shndx
== (*p
)->out_shndx());
212 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
213 (*p
)->write_header(this->layout_
, this->secnamepool_
, &oshdr
);
219 for (Layout::Section_list::const_iterator p
=
220 this->unattached_section_list_
->begin();
221 p
!= this->unattached_section_list_
->end();
224 // For a relocatable link, we did unallocated group sections
225 // above, since they have to come first.
226 if ((*p
)->type() == elfcpp::SHT_GROUP
227 && parameters
->options().relocatable())
229 gold_assert(shndx
== (*p
)->out_shndx());
230 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
231 (*p
)->write_header(this->layout_
, this->secnamepool_
, &oshdr
);
236 of
->write_output_view(this->offset(), all_shdrs_size
, view
);
239 // Output_segment_header methods.
241 Output_segment_headers::Output_segment_headers(
242 const Layout::Segment_list
& segment_list
)
243 : segment_list_(segment_list
)
245 const int size
= parameters
->target().get_size();
248 phdr_size
= elfcpp::Elf_sizes
<32>::phdr_size
;
250 phdr_size
= elfcpp::Elf_sizes
<64>::phdr_size
;
254 this->set_data_size(segment_list
.size() * phdr_size
);
258 Output_segment_headers::do_write(Output_file
* of
)
260 switch (parameters
->size_and_endianness())
262 #ifdef HAVE_TARGET_32_LITTLE
263 case Parameters::TARGET_32_LITTLE
:
264 this->do_sized_write
<32, false>(of
);
267 #ifdef HAVE_TARGET_32_BIG
268 case Parameters::TARGET_32_BIG
:
269 this->do_sized_write
<32, true>(of
);
272 #ifdef HAVE_TARGET_64_LITTLE
273 case Parameters::TARGET_64_LITTLE
:
274 this->do_sized_write
<64, false>(of
);
277 #ifdef HAVE_TARGET_64_BIG
278 case Parameters::TARGET_64_BIG
:
279 this->do_sized_write
<64, true>(of
);
287 template<int size
, bool big_endian
>
289 Output_segment_headers::do_sized_write(Output_file
* of
)
291 const int phdr_size
= elfcpp::Elf_sizes
<size
>::phdr_size
;
292 off_t all_phdrs_size
= this->segment_list_
.size() * phdr_size
;
293 gold_assert(all_phdrs_size
== this->data_size());
294 unsigned char* view
= of
->get_output_view(this->offset(),
296 unsigned char* v
= view
;
297 for (Layout::Segment_list::const_iterator p
= this->segment_list_
.begin();
298 p
!= this->segment_list_
.end();
301 elfcpp::Phdr_write
<size
, big_endian
> ophdr(v
);
302 (*p
)->write_header(&ophdr
);
306 gold_assert(v
- view
== all_phdrs_size
);
308 of
->write_output_view(this->offset(), all_phdrs_size
, view
);
311 // Output_file_header methods.
313 Output_file_header::Output_file_header(const Target
* target
,
314 const Symbol_table
* symtab
,
315 const Output_segment_headers
* osh
,
319 segment_header_(osh
),
320 section_header_(NULL
),
324 const int size
= parameters
->target().get_size();
327 ehdr_size
= elfcpp::Elf_sizes
<32>::ehdr_size
;
329 ehdr_size
= elfcpp::Elf_sizes
<64>::ehdr_size
;
333 this->set_data_size(ehdr_size
);
336 // Set the section table information for a file header.
339 Output_file_header::set_section_info(const Output_section_headers
* shdrs
,
340 const Output_section
* shstrtab
)
342 this->section_header_
= shdrs
;
343 this->shstrtab_
= shstrtab
;
346 // Write out the file header.
349 Output_file_header::do_write(Output_file
* of
)
351 gold_assert(this->offset() == 0);
353 switch (parameters
->size_and_endianness())
355 #ifdef HAVE_TARGET_32_LITTLE
356 case Parameters::TARGET_32_LITTLE
:
357 this->do_sized_write
<32, false>(of
);
360 #ifdef HAVE_TARGET_32_BIG
361 case Parameters::TARGET_32_BIG
:
362 this->do_sized_write
<32, true>(of
);
365 #ifdef HAVE_TARGET_64_LITTLE
366 case Parameters::TARGET_64_LITTLE
:
367 this->do_sized_write
<64, false>(of
);
370 #ifdef HAVE_TARGET_64_BIG
371 case Parameters::TARGET_64_BIG
:
372 this->do_sized_write
<64, true>(of
);
380 // Write out the file header with appropriate size and endianess.
382 template<int size
, bool big_endian
>
384 Output_file_header::do_sized_write(Output_file
* of
)
386 gold_assert(this->offset() == 0);
388 int ehdr_size
= elfcpp::Elf_sizes
<size
>::ehdr_size
;
389 unsigned char* view
= of
->get_output_view(0, ehdr_size
);
390 elfcpp::Ehdr_write
<size
, big_endian
> oehdr(view
);
392 unsigned char e_ident
[elfcpp::EI_NIDENT
];
393 memset(e_ident
, 0, elfcpp::EI_NIDENT
);
394 e_ident
[elfcpp::EI_MAG0
] = elfcpp::ELFMAG0
;
395 e_ident
[elfcpp::EI_MAG1
] = elfcpp::ELFMAG1
;
396 e_ident
[elfcpp::EI_MAG2
] = elfcpp::ELFMAG2
;
397 e_ident
[elfcpp::EI_MAG3
] = elfcpp::ELFMAG3
;
399 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS32
;
401 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS64
;
404 e_ident
[elfcpp::EI_DATA
] = (big_endian
405 ? elfcpp::ELFDATA2MSB
406 : elfcpp::ELFDATA2LSB
);
407 e_ident
[elfcpp::EI_VERSION
] = elfcpp::EV_CURRENT
;
408 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
409 oehdr
.put_e_ident(e_ident
);
412 if (parameters
->options().relocatable())
413 e_type
= elfcpp::ET_REL
;
414 else if (parameters
->options().shared())
415 e_type
= elfcpp::ET_DYN
;
417 e_type
= elfcpp::ET_EXEC
;
418 oehdr
.put_e_type(e_type
);
420 oehdr
.put_e_machine(this->target_
->machine_code());
421 oehdr
.put_e_version(elfcpp::EV_CURRENT
);
423 oehdr
.put_e_entry(this->entry
<size
>());
425 if (this->segment_header_
== NULL
)
426 oehdr
.put_e_phoff(0);
428 oehdr
.put_e_phoff(this->segment_header_
->offset());
430 oehdr
.put_e_shoff(this->section_header_
->offset());
432 // FIXME: The target needs to set the flags.
433 oehdr
.put_e_flags(0);
435 oehdr
.put_e_ehsize(elfcpp::Elf_sizes
<size
>::ehdr_size
);
437 if (this->segment_header_
== NULL
)
439 oehdr
.put_e_phentsize(0);
440 oehdr
.put_e_phnum(0);
444 oehdr
.put_e_phentsize(elfcpp::Elf_sizes
<size
>::phdr_size
);
445 oehdr
.put_e_phnum(this->segment_header_
->data_size()
446 / elfcpp::Elf_sizes
<size
>::phdr_size
);
449 oehdr
.put_e_shentsize(elfcpp::Elf_sizes
<size
>::shdr_size
);
450 oehdr
.put_e_shnum(this->section_header_
->data_size()
451 / elfcpp::Elf_sizes
<size
>::shdr_size
);
452 oehdr
.put_e_shstrndx(this->shstrtab_
->out_shndx());
454 of
->write_output_view(0, ehdr_size
, view
);
457 // Return the value to use for the entry address. THIS->ENTRY_ is the
458 // symbol specified on the command line, if any.
461 typename
elfcpp::Elf_types
<size
>::Elf_Addr
462 Output_file_header::entry()
464 const bool should_issue_warning
= (this->entry_
!= NULL
465 && !parameters
->options().relocatable()
466 && !parameters
->options().shared());
468 // FIXME: Need to support target specific entry symbol.
469 const char* entry
= this->entry_
;
473 Symbol
* sym
= this->symtab_
->lookup(entry
);
475 typename Sized_symbol
<size
>::Value_type v
;
478 Sized_symbol
<size
>* ssym
;
479 ssym
= this->symtab_
->get_sized_symbol
<size
>(sym
);
480 if (!ssym
->is_defined() && should_issue_warning
)
481 gold_warning("entry symbol '%s' exists but is not defined", entry
);
486 // We couldn't find the entry symbol. See if we can parse it as
487 // a number. This supports, e.g., -e 0x1000.
489 v
= strtoull(entry
, &endptr
, 0);
492 if (should_issue_warning
)
493 gold_warning("cannot find entry symbol '%s'", entry
);
501 // Output_data_const methods.
504 Output_data_const::do_write(Output_file
* of
)
506 of
->write(this->offset(), this->data_
.data(), this->data_
.size());
509 // Output_data_const_buffer methods.
512 Output_data_const_buffer::do_write(Output_file
* of
)
514 of
->write(this->offset(), this->p_
, this->data_size());
517 // Output_section_data methods.
519 // Record the output section, and set the entry size and such.
522 Output_section_data::set_output_section(Output_section
* os
)
524 gold_assert(this->output_section_
== NULL
);
525 this->output_section_
= os
;
526 this->do_adjust_output_section(os
);
529 // Return the section index of the output section.
532 Output_section_data::do_out_shndx() const
534 gold_assert(this->output_section_
!= NULL
);
535 return this->output_section_
->out_shndx();
538 // Output_data_strtab methods.
540 // Set the final data size.
543 Output_data_strtab::set_final_data_size()
545 this->strtab_
->set_string_offsets();
546 this->set_data_size(this->strtab_
->get_strtab_size());
549 // Write out a string table.
552 Output_data_strtab::do_write(Output_file
* of
)
554 this->strtab_
->write(of
, this->offset());
557 // Output_reloc methods.
559 // A reloc against a global symbol.
561 template<bool dynamic
, int size
, bool big_endian
>
562 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
568 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
569 is_relative_(is_relative
), is_section_symbol_(false), shndx_(INVALID_CODE
)
571 // this->type_ is a bitfield; make sure TYPE fits.
572 gold_assert(this->type_
== type
);
573 this->u1_
.gsym
= gsym
;
576 this->set_needs_dynsym_index();
579 template<bool dynamic
, int size
, bool big_endian
>
580 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
587 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
588 is_relative_(is_relative
), is_section_symbol_(false), shndx_(shndx
)
590 gold_assert(shndx
!= INVALID_CODE
);
591 // this->type_ is a bitfield; make sure TYPE fits.
592 gold_assert(this->type_
== type
);
593 this->u1_
.gsym
= gsym
;
594 this->u2_
.relobj
= relobj
;
596 this->set_needs_dynsym_index();
599 // A reloc against a local symbol.
601 template<bool dynamic
, int size
, bool big_endian
>
602 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
603 Sized_relobj
<size
, big_endian
>* relobj
,
604 unsigned int local_sym_index
,
609 bool is_section_symbol
)
610 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
611 is_relative_(is_relative
), is_section_symbol_(is_section_symbol
),
614 gold_assert(local_sym_index
!= GSYM_CODE
615 && local_sym_index
!= INVALID_CODE
);
616 // this->type_ is a bitfield; make sure TYPE fits.
617 gold_assert(this->type_
== type
);
618 this->u1_
.relobj
= relobj
;
621 this->set_needs_dynsym_index();
624 template<bool dynamic
, int size
, bool big_endian
>
625 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
626 Sized_relobj
<size
, big_endian
>* relobj
,
627 unsigned int local_sym_index
,
632 bool is_section_symbol
)
633 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
634 is_relative_(is_relative
), is_section_symbol_(is_section_symbol
),
637 gold_assert(local_sym_index
!= GSYM_CODE
638 && local_sym_index
!= INVALID_CODE
);
639 gold_assert(shndx
!= INVALID_CODE
);
640 // this->type_ is a bitfield; make sure TYPE fits.
641 gold_assert(this->type_
== type
);
642 this->u1_
.relobj
= relobj
;
643 this->u2_
.relobj
= relobj
;
645 this->set_needs_dynsym_index();
648 // A reloc against the STT_SECTION symbol of an output section.
650 template<bool dynamic
, int size
, bool big_endian
>
651 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
656 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
657 is_relative_(false), is_section_symbol_(true), shndx_(INVALID_CODE
)
659 // this->type_ is a bitfield; make sure TYPE fits.
660 gold_assert(this->type_
== type
);
664 this->set_needs_dynsym_index();
666 os
->set_needs_symtab_index();
669 template<bool dynamic
, int size
, bool big_endian
>
670 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
676 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
677 is_relative_(false), is_section_symbol_(true), shndx_(shndx
)
679 gold_assert(shndx
!= INVALID_CODE
);
680 // this->type_ is a bitfield; make sure TYPE fits.
681 gold_assert(this->type_
== type
);
683 this->u2_
.relobj
= relobj
;
685 this->set_needs_dynsym_index();
687 os
->set_needs_symtab_index();
690 // Record that we need a dynamic symbol index for this relocation.
692 template<bool dynamic
, int size
, bool big_endian
>
694 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::
695 set_needs_dynsym_index()
697 if (this->is_relative_
)
699 switch (this->local_sym_index_
)
705 this->u1_
.gsym
->set_needs_dynsym_entry();
709 this->u1_
.os
->set_needs_dynsym_index();
717 const unsigned int lsi
= this->local_sym_index_
;
718 if (!this->is_section_symbol_
)
719 this->u1_
.relobj
->set_needs_output_dynsym_entry(lsi
);
722 section_offset_type dummy
;
723 Output_section
* os
= this->u1_
.relobj
->output_section(lsi
, &dummy
);
724 gold_assert(os
!= NULL
);
725 os
->set_needs_dynsym_index();
732 // Get the symbol index of a relocation.
734 template<bool dynamic
, int size
, bool big_endian
>
736 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::get_symbol_index()
740 switch (this->local_sym_index_
)
746 if (this->u1_
.gsym
== NULL
)
749 index
= this->u1_
.gsym
->dynsym_index();
751 index
= this->u1_
.gsym
->symtab_index();
756 index
= this->u1_
.os
->dynsym_index();
758 index
= this->u1_
.os
->symtab_index();
762 // Relocations without symbols use a symbol index of 0.
768 const unsigned int lsi
= this->local_sym_index_
;
769 if (!this->is_section_symbol_
)
772 index
= this->u1_
.relobj
->dynsym_index(lsi
);
774 index
= this->u1_
.relobj
->symtab_index(lsi
);
778 section_offset_type dummy
;
779 Output_section
* os
= this->u1_
.relobj
->output_section(lsi
, &dummy
);
780 gold_assert(os
!= NULL
);
782 index
= os
->dynsym_index();
784 index
= os
->symtab_index();
789 gold_assert(index
!= -1U);
793 // For a local section symbol, get the section offset of the input
794 // section within the output section.
796 template<bool dynamic
, int size
, bool big_endian
>
798 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::
799 local_section_offset() const
801 const unsigned int lsi
= this->local_sym_index_
;
802 section_offset_type offset
;
803 Output_section
* os
= this->u1_
.relobj
->output_section(lsi
, &offset
);
804 gold_assert(os
!= NULL
&& offset
!= -1);
808 // Write out the offset and info fields of a Rel or Rela relocation
811 template<bool dynamic
, int size
, bool big_endian
>
812 template<typename Write_rel
>
814 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write_rel(
817 Address address
= this->address_
;
818 if (this->shndx_
!= INVALID_CODE
)
820 section_offset_type off
;
821 Output_section
* os
= this->u2_
.relobj
->output_section(this->shndx_
,
823 gold_assert(os
!= NULL
);
825 address
+= os
->address() + off
;
828 address
= os
->output_address(this->u2_
.relobj
, this->shndx_
,
830 gold_assert(address
!= -1U);
833 else if (this->u2_
.od
!= NULL
)
834 address
+= this->u2_
.od
->address();
835 wr
->put_r_offset(address
);
836 unsigned int sym_index
= this->is_relative_
? 0 : this->get_symbol_index();
837 wr
->put_r_info(elfcpp::elf_r_info
<size
>(sym_index
, this->type_
));
840 // Write out a Rel relocation.
842 template<bool dynamic
, int size
, bool big_endian
>
844 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write(
845 unsigned char* pov
) const
847 elfcpp::Rel_write
<size
, big_endian
> orel(pov
);
848 this->write_rel(&orel
);
851 // Get the value of the symbol referred to by a Rel relocation.
853 template<bool dynamic
, int size
, bool big_endian
>
854 typename
elfcpp::Elf_types
<size
>::Elf_Addr
855 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::symbol_value(
856 Address addend
) const
858 if (this->local_sym_index_
== GSYM_CODE
)
860 const Sized_symbol
<size
>* sym
;
861 sym
= static_cast<const Sized_symbol
<size
>*>(this->u1_
.gsym
);
862 return sym
->value() + addend
;
864 gold_assert(this->local_sym_index_
!= SECTION_CODE
865 && this->local_sym_index_
!= INVALID_CODE
866 && !this->is_section_symbol_
);
867 const unsigned int lsi
= this->local_sym_index_
;
868 const Symbol_value
<size
>* symval
= this->u1_
.relobj
->local_symbol(lsi
);
869 return symval
->value(this->u1_
.relobj
, addend
);
872 // Write out a Rela relocation.
874 template<bool dynamic
, int size
, bool big_endian
>
876 Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>::write(
877 unsigned char* pov
) const
879 elfcpp::Rela_write
<size
, big_endian
> orel(pov
);
880 this->rel_
.write_rel(&orel
);
881 Addend addend
= this->addend_
;
882 if (this->rel_
.is_relative())
883 addend
= this->rel_
.symbol_value(addend
);
884 else if (this->rel_
.is_local_section_symbol())
885 addend
+= this->rel_
.local_section_offset();
886 orel
.put_r_addend(addend
);
889 // Output_data_reloc_base methods.
891 // Adjust the output section.
893 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
895 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>
896 ::do_adjust_output_section(Output_section
* os
)
898 if (sh_type
== elfcpp::SHT_REL
)
899 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
900 else if (sh_type
== elfcpp::SHT_RELA
)
901 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
905 os
->set_should_link_to_dynsym();
907 os
->set_should_link_to_symtab();
910 // Write out relocation data.
912 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
914 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>::do_write(
917 const off_t off
= this->offset();
918 const off_t oview_size
= this->data_size();
919 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
921 unsigned char* pov
= oview
;
922 for (typename
Relocs::const_iterator p
= this->relocs_
.begin();
923 p
!= this->relocs_
.end();
930 gold_assert(pov
- oview
== oview_size
);
932 of
->write_output_view(off
, oview_size
, oview
);
934 // We no longer need the relocation entries.
935 this->relocs_
.clear();
938 // Class Output_relocatable_relocs.
940 template<int sh_type
, int size
, bool big_endian
>
942 Output_relocatable_relocs
<sh_type
, size
, big_endian
>::set_final_data_size()
944 this->set_data_size(this->rr_
->output_reloc_count()
945 * Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
);
948 // class Output_data_group.
950 template<int size
, bool big_endian
>
951 Output_data_group
<size
, big_endian
>::Output_data_group(
952 Sized_relobj
<size
, big_endian
>* relobj
,
953 section_size_type entry_count
,
954 const elfcpp::Elf_Word
* contents
)
955 : Output_section_data(entry_count
* 4, 4),
958 this->flags_
= elfcpp::Swap
<32, big_endian
>::readval(contents
);
959 for (section_size_type i
= 1; i
< entry_count
; ++i
)
961 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
962 this->input_sections_
.push_back(shndx
);
966 // Write out the section group, which means translating the section
967 // indexes to apply to the output file.
969 template<int size
, bool big_endian
>
971 Output_data_group
<size
, big_endian
>::do_write(Output_file
* of
)
973 const off_t off
= this->offset();
974 const section_size_type oview_size
=
975 convert_to_section_size_type(this->data_size());
976 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
978 elfcpp::Elf_Word
* contents
= reinterpret_cast<elfcpp::Elf_Word
*>(oview
);
979 elfcpp::Swap
<32, big_endian
>::writeval(contents
, this->flags_
);
982 for (std::vector
<unsigned int>::const_iterator p
=
983 this->input_sections_
.begin();
984 p
!= this->input_sections_
.end();
987 section_offset_type dummy
;
988 Output_section
* os
= this->relobj_
->output_section(*p
, &dummy
);
990 unsigned int output_shndx
;
992 output_shndx
= os
->out_shndx();
995 this->relobj_
->error(_("section group retained but "
996 "group element discarded"));
1000 elfcpp::Swap
<32, big_endian
>::writeval(contents
, output_shndx
);
1003 size_t wrote
= reinterpret_cast<unsigned char*>(contents
) - oview
;
1004 gold_assert(wrote
== oview_size
);
1006 of
->write_output_view(off
, oview_size
, oview
);
1008 // We no longer need this information.
1009 this->input_sections_
.clear();
1012 // Output_data_got::Got_entry methods.
1014 // Write out the entry.
1016 template<int size
, bool big_endian
>
1018 Output_data_got
<size
, big_endian
>::Got_entry::write(unsigned char* pov
) const
1022 switch (this->local_sym_index_
)
1026 // If the symbol is resolved locally, we need to write out the
1027 // link-time value, which will be relocated dynamically by a
1028 // RELATIVE relocation.
1029 Symbol
* gsym
= this->u_
.gsym
;
1030 Sized_symbol
<size
>* sgsym
;
1031 // This cast is a bit ugly. We don't want to put a
1032 // virtual method in Symbol, because we want Symbol to be
1033 // as small as possible.
1034 sgsym
= static_cast<Sized_symbol
<size
>*>(gsym
);
1035 val
= sgsym
->value();
1040 val
= this->u_
.constant
;
1045 const unsigned int lsi
= this->local_sym_index_
;
1046 const Symbol_value
<size
>* symval
= this->u_
.object
->local_symbol(lsi
);
1047 val
= symval
->value(this->u_
.object
, 0);
1052 elfcpp::Swap
<size
, big_endian
>::writeval(pov
, val
);
1055 // Output_data_got methods.
1057 // Add an entry for a global symbol to the GOT. This returns true if
1058 // this is a new GOT entry, false if the symbol already had a GOT
1061 template<int size
, bool big_endian
>
1063 Output_data_got
<size
, big_endian
>::add_global(
1065 unsigned int got_type
)
1067 if (gsym
->has_got_offset(got_type
))
1070 this->entries_
.push_back(Got_entry(gsym
));
1071 this->set_got_size();
1072 gsym
->set_got_offset(got_type
, this->last_got_offset());
1076 // Add an entry for a global symbol to the GOT, and add a dynamic
1077 // relocation of type R_TYPE for the GOT entry.
1078 template<int size
, bool big_endian
>
1080 Output_data_got
<size
, big_endian
>::add_global_with_rel(
1082 unsigned int got_type
,
1084 unsigned int r_type
)
1086 if (gsym
->has_got_offset(got_type
))
1089 this->entries_
.push_back(Got_entry());
1090 this->set_got_size();
1091 unsigned int got_offset
= this->last_got_offset();
1092 gsym
->set_got_offset(got_type
, got_offset
);
1093 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
1096 template<int size
, bool big_endian
>
1098 Output_data_got
<size
, big_endian
>::add_global_with_rela(
1100 unsigned int got_type
,
1102 unsigned int r_type
)
1104 if (gsym
->has_got_offset(got_type
))
1107 this->entries_
.push_back(Got_entry());
1108 this->set_got_size();
1109 unsigned int got_offset
= this->last_got_offset();
1110 gsym
->set_got_offset(got_type
, got_offset
);
1111 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
1114 // Add a pair of entries for a global symbol to the GOT, and add
1115 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1116 // If R_TYPE_2 == 0, add the second entry with no relocation.
1117 template<int size
, bool big_endian
>
1119 Output_data_got
<size
, big_endian
>::add_global_pair_with_rel(
1121 unsigned int got_type
,
1123 unsigned int r_type_1
,
1124 unsigned int r_type_2
)
1126 if (gsym
->has_got_offset(got_type
))
1129 this->entries_
.push_back(Got_entry());
1130 unsigned int got_offset
= this->last_got_offset();
1131 gsym
->set_got_offset(got_type
, got_offset
);
1132 rel_dyn
->add_global(gsym
, r_type_1
, this, got_offset
);
1134 this->entries_
.push_back(Got_entry());
1137 got_offset
= this->last_got_offset();
1138 rel_dyn
->add_global(gsym
, r_type_2
, this, got_offset
);
1141 this->set_got_size();
1144 template<int size
, bool big_endian
>
1146 Output_data_got
<size
, big_endian
>::add_global_pair_with_rela(
1148 unsigned int got_type
,
1150 unsigned int r_type_1
,
1151 unsigned int r_type_2
)
1153 if (gsym
->has_got_offset(got_type
))
1156 this->entries_
.push_back(Got_entry());
1157 unsigned int got_offset
= this->last_got_offset();
1158 gsym
->set_got_offset(got_type
, got_offset
);
1159 rela_dyn
->add_global(gsym
, r_type_1
, this, got_offset
, 0);
1161 this->entries_
.push_back(Got_entry());
1164 got_offset
= this->last_got_offset();
1165 rela_dyn
->add_global(gsym
, r_type_2
, this, got_offset
, 0);
1168 this->set_got_size();
1171 // Add an entry for a local symbol to the GOT. This returns true if
1172 // this is a new GOT entry, false if the symbol already has a GOT
1175 template<int size
, bool big_endian
>
1177 Output_data_got
<size
, big_endian
>::add_local(
1178 Sized_relobj
<size
, big_endian
>* object
,
1179 unsigned int symndx
,
1180 unsigned int got_type
)
1182 if (object
->local_has_got_offset(symndx
, got_type
))
1185 this->entries_
.push_back(Got_entry(object
, symndx
));
1186 this->set_got_size();
1187 object
->set_local_got_offset(symndx
, got_type
, this->last_got_offset());
1191 // Add an entry for a local symbol to the GOT, and add a dynamic
1192 // relocation of type R_TYPE for the GOT entry.
1193 template<int size
, bool big_endian
>
1195 Output_data_got
<size
, big_endian
>::add_local_with_rel(
1196 Sized_relobj
<size
, big_endian
>* object
,
1197 unsigned int symndx
,
1198 unsigned int got_type
,
1200 unsigned int r_type
)
1202 if (object
->local_has_got_offset(symndx
, got_type
))
1205 this->entries_
.push_back(Got_entry());
1206 this->set_got_size();
1207 unsigned int got_offset
= this->last_got_offset();
1208 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1209 rel_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
);
1212 template<int size
, bool big_endian
>
1214 Output_data_got
<size
, big_endian
>::add_local_with_rela(
1215 Sized_relobj
<size
, big_endian
>* object
,
1216 unsigned int symndx
,
1217 unsigned int got_type
,
1219 unsigned int r_type
)
1221 if (object
->local_has_got_offset(symndx
, got_type
))
1224 this->entries_
.push_back(Got_entry());
1225 this->set_got_size();
1226 unsigned int got_offset
= this->last_got_offset();
1227 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1228 rela_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
, 0);
1231 // Add a pair of entries for a local symbol to the GOT, and add
1232 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1233 // If R_TYPE_2 == 0, add the second entry with no relocation.
1234 template<int size
, bool big_endian
>
1236 Output_data_got
<size
, big_endian
>::add_local_pair_with_rel(
1237 Sized_relobj
<size
, big_endian
>* object
,
1238 unsigned int symndx
,
1240 unsigned int got_type
,
1242 unsigned int r_type_1
,
1243 unsigned int r_type_2
)
1245 if (object
->local_has_got_offset(symndx
, got_type
))
1248 this->entries_
.push_back(Got_entry());
1249 unsigned int got_offset
= this->last_got_offset();
1250 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1251 section_offset_type off
;
1252 Output_section
* os
= object
->output_section(shndx
, &off
);
1253 rel_dyn
->add_output_section(os
, r_type_1
, this, got_offset
);
1255 this->entries_
.push_back(Got_entry(object
, symndx
));
1258 got_offset
= this->last_got_offset();
1259 rel_dyn
->add_output_section(os
, r_type_2
, this, got_offset
);
1262 this->set_got_size();
1265 template<int size
, bool big_endian
>
1267 Output_data_got
<size
, big_endian
>::add_local_pair_with_rela(
1268 Sized_relobj
<size
, big_endian
>* object
,
1269 unsigned int symndx
,
1271 unsigned int got_type
,
1273 unsigned int r_type_1
,
1274 unsigned int r_type_2
)
1276 if (object
->local_has_got_offset(symndx
, got_type
))
1279 this->entries_
.push_back(Got_entry());
1280 unsigned int got_offset
= this->last_got_offset();
1281 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1282 section_offset_type off
;
1283 Output_section
* os
= object
->output_section(shndx
, &off
);
1284 rela_dyn
->add_output_section(os
, r_type_1
, this, got_offset
, 0);
1286 this->entries_
.push_back(Got_entry(object
, symndx
));
1289 got_offset
= this->last_got_offset();
1290 rela_dyn
->add_output_section(os
, r_type_2
, this, got_offset
, 0);
1293 this->set_got_size();
1296 // Write out the GOT.
1298 template<int size
, bool big_endian
>
1300 Output_data_got
<size
, big_endian
>::do_write(Output_file
* of
)
1302 const int add
= size
/ 8;
1304 const off_t off
= this->offset();
1305 const off_t oview_size
= this->data_size();
1306 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1308 unsigned char* pov
= oview
;
1309 for (typename
Got_entries::const_iterator p
= this->entries_
.begin();
1310 p
!= this->entries_
.end();
1317 gold_assert(pov
- oview
== oview_size
);
1319 of
->write_output_view(off
, oview_size
, oview
);
1321 // We no longer need the GOT entries.
1322 this->entries_
.clear();
1325 // Output_data_dynamic::Dynamic_entry methods.
1327 // Write out the entry.
1329 template<int size
, bool big_endian
>
1331 Output_data_dynamic::Dynamic_entry::write(
1333 const Stringpool
* pool
) const
1335 typename
elfcpp::Elf_types
<size
>::Elf_WXword val
;
1336 switch (this->classification_
)
1338 case DYNAMIC_NUMBER
:
1342 case DYNAMIC_SECTION_ADDRESS
:
1343 val
= this->u_
.od
->address();
1346 case DYNAMIC_SECTION_SIZE
:
1347 val
= this->u_
.od
->data_size();
1350 case DYNAMIC_SYMBOL
:
1352 const Sized_symbol
<size
>* s
=
1353 static_cast<const Sized_symbol
<size
>*>(this->u_
.sym
);
1358 case DYNAMIC_STRING
:
1359 val
= pool
->get_offset(this->u_
.str
);
1366 elfcpp::Dyn_write
<size
, big_endian
> dw(pov
);
1367 dw
.put_d_tag(this->tag_
);
1371 // Output_data_dynamic methods.
1373 // Adjust the output section to set the entry size.
1376 Output_data_dynamic::do_adjust_output_section(Output_section
* os
)
1378 if (parameters
->target().get_size() == 32)
1379 os
->set_entsize(elfcpp::Elf_sizes
<32>::dyn_size
);
1380 else if (parameters
->target().get_size() == 64)
1381 os
->set_entsize(elfcpp::Elf_sizes
<64>::dyn_size
);
1386 // Set the final data size.
1389 Output_data_dynamic::set_final_data_size()
1391 // Add the terminating entry.
1392 this->add_constant(elfcpp::DT_NULL
, 0);
1395 if (parameters
->target().get_size() == 32)
1396 dyn_size
= elfcpp::Elf_sizes
<32>::dyn_size
;
1397 else if (parameters
->target().get_size() == 64)
1398 dyn_size
= elfcpp::Elf_sizes
<64>::dyn_size
;
1401 this->set_data_size(this->entries_
.size() * dyn_size
);
1404 // Write out the dynamic entries.
1407 Output_data_dynamic::do_write(Output_file
* of
)
1409 switch (parameters
->size_and_endianness())
1411 #ifdef HAVE_TARGET_32_LITTLE
1412 case Parameters::TARGET_32_LITTLE
:
1413 this->sized_write
<32, false>(of
);
1416 #ifdef HAVE_TARGET_32_BIG
1417 case Parameters::TARGET_32_BIG
:
1418 this->sized_write
<32, true>(of
);
1421 #ifdef HAVE_TARGET_64_LITTLE
1422 case Parameters::TARGET_64_LITTLE
:
1423 this->sized_write
<64, false>(of
);
1426 #ifdef HAVE_TARGET_64_BIG
1427 case Parameters::TARGET_64_BIG
:
1428 this->sized_write
<64, true>(of
);
1436 template<int size
, bool big_endian
>
1438 Output_data_dynamic::sized_write(Output_file
* of
)
1440 const int dyn_size
= elfcpp::Elf_sizes
<size
>::dyn_size
;
1442 const off_t offset
= this->offset();
1443 const off_t oview_size
= this->data_size();
1444 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1446 unsigned char* pov
= oview
;
1447 for (typename
Dynamic_entries::const_iterator p
= this->entries_
.begin();
1448 p
!= this->entries_
.end();
1451 p
->write
<size
, big_endian
>(pov
, this->pool_
);
1455 gold_assert(pov
- oview
== oview_size
);
1457 of
->write_output_view(offset
, oview_size
, oview
);
1459 // We no longer need the dynamic entries.
1460 this->entries_
.clear();
1463 // Output_section::Input_section methods.
1465 // Return the data size. For an input section we store the size here.
1466 // For an Output_section_data, we have to ask it for the size.
1469 Output_section::Input_section::data_size() const
1471 if (this->is_input_section())
1472 return this->u1_
.data_size
;
1474 return this->u2_
.posd
->data_size();
1477 // Set the address and file offset.
1480 Output_section::Input_section::set_address_and_file_offset(
1483 off_t section_file_offset
)
1485 if (this->is_input_section())
1486 this->u2_
.object
->set_section_offset(this->shndx_
,
1487 file_offset
- section_file_offset
);
1489 this->u2_
.posd
->set_address_and_file_offset(address
, file_offset
);
1492 // Reset the address and file offset.
1495 Output_section::Input_section::reset_address_and_file_offset()
1497 if (!this->is_input_section())
1498 this->u2_
.posd
->reset_address_and_file_offset();
1501 // Finalize the data size.
1504 Output_section::Input_section::finalize_data_size()
1506 if (!this->is_input_section())
1507 this->u2_
.posd
->finalize_data_size();
1510 // Try to turn an input offset into an output offset. We want to
1511 // return the output offset relative to the start of this
1512 // Input_section in the output section.
1515 Output_section::Input_section::output_offset(
1516 const Relobj
* object
,
1518 section_offset_type offset
,
1519 section_offset_type
*poutput
) const
1521 if (!this->is_input_section())
1522 return this->u2_
.posd
->output_offset(object
, shndx
, offset
, poutput
);
1525 if (this->shndx_
!= shndx
|| this->u2_
.object
!= object
)
1532 // Return whether this is the merge section for the input section
1536 Output_section::Input_section::is_merge_section_for(const Relobj
* object
,
1537 unsigned int shndx
) const
1539 if (this->is_input_section())
1541 return this->u2_
.posd
->is_merge_section_for(object
, shndx
);
1544 // Write out the data. We don't have to do anything for an input
1545 // section--they are handled via Object::relocate--but this is where
1546 // we write out the data for an Output_section_data.
1549 Output_section::Input_section::write(Output_file
* of
)
1551 if (!this->is_input_section())
1552 this->u2_
.posd
->write(of
);
1555 // Write the data to a buffer. As for write(), we don't have to do
1556 // anything for an input section.
1559 Output_section::Input_section::write_to_buffer(unsigned char* buffer
)
1561 if (!this->is_input_section())
1562 this->u2_
.posd
->write_to_buffer(buffer
);
1565 // Output_section methods.
1567 // Construct an Output_section. NAME will point into a Stringpool.
1569 Output_section::Output_section(const char* name
, elfcpp::Elf_Word type
,
1570 elfcpp::Elf_Xword flags
)
1575 link_section_(NULL
),
1577 info_section_(NULL
),
1586 first_input_offset_(0),
1588 postprocessing_buffer_(NULL
),
1589 needs_symtab_index_(false),
1590 needs_dynsym_index_(false),
1591 should_link_to_symtab_(false),
1592 should_link_to_dynsym_(false),
1593 after_input_sections_(false),
1594 requires_postprocessing_(false),
1595 found_in_sections_clause_(false),
1596 has_load_address_(false),
1597 info_uses_section_index_(false),
1598 may_sort_attached_input_sections_(false),
1599 must_sort_attached_input_sections_(false),
1600 attached_input_sections_are_sorted_(false),
1603 // An unallocated section has no address. Forcing this means that
1604 // we don't need special treatment for symbols defined in debug
1606 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
1607 this->set_address(0);
1610 Output_section::~Output_section()
1614 // Set the entry size.
1617 Output_section::set_entsize(uint64_t v
)
1619 if (this->entsize_
== 0)
1622 gold_assert(this->entsize_
== v
);
1625 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1626 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1627 // relocation section which applies to this section, or 0 if none, or
1628 // -1U if more than one. Return the offset of the input section
1629 // within the output section. Return -1 if the input section will
1630 // receive special handling. In the normal case we don't always keep
1631 // track of input sections for an Output_section. Instead, each
1632 // Object keeps track of the Output_section for each of its input
1633 // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep
1634 // track of input sections here; this is used when SECTIONS appears in
1637 template<int size
, bool big_endian
>
1639 Output_section::add_input_section(Sized_relobj
<size
, big_endian
>* object
,
1641 const char* secname
,
1642 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1643 unsigned int reloc_shndx
,
1644 bool have_sections_script
)
1646 elfcpp::Elf_Xword addralign
= shdr
.get_sh_addralign();
1647 if ((addralign
& (addralign
- 1)) != 0)
1649 object
->error(_("invalid alignment %lu for section \"%s\""),
1650 static_cast<unsigned long>(addralign
), secname
);
1654 if (addralign
> this->addralign_
)
1655 this->addralign_
= addralign
;
1657 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_flags
= shdr
.get_sh_flags();
1658 this->flags_
|= (sh_flags
1659 & (elfcpp::SHF_WRITE
1661 | elfcpp::SHF_EXECINSTR
));
1663 uint64_t entsize
= shdr
.get_sh_entsize();
1665 // .debug_str is a mergeable string section, but is not always so
1666 // marked by compilers. Mark manually here so we can optimize.
1667 if (strcmp(secname
, ".debug_str") == 0)
1669 sh_flags
|= (elfcpp::SHF_MERGE
| elfcpp::SHF_STRINGS
);
1673 // If this is a SHF_MERGE section, we pass all the input sections to
1674 // a Output_data_merge. We don't try to handle relocations for such
1676 if ((sh_flags
& elfcpp::SHF_MERGE
) != 0
1677 && reloc_shndx
== 0)
1679 if (this->add_merge_input_section(object
, shndx
, sh_flags
,
1680 entsize
, addralign
))
1682 // Tell the relocation routines that they need to call the
1683 // output_offset method to determine the final address.
1688 off_t offset_in_section
= this->current_data_size_for_child();
1689 off_t aligned_offset_in_section
= align_address(offset_in_section
,
1692 if (aligned_offset_in_section
> offset_in_section
1693 && !have_sections_script
1694 && (sh_flags
& elfcpp::SHF_EXECINSTR
) != 0
1695 && object
->target()->has_code_fill())
1697 // We need to add some fill data. Using fill_list_ when
1698 // possible is an optimization, since we will often have fill
1699 // sections without input sections.
1700 off_t fill_len
= aligned_offset_in_section
- offset_in_section
;
1701 if (this->input_sections_
.empty())
1702 this->fills_
.push_back(Fill(offset_in_section
, fill_len
));
1705 // FIXME: When relaxing, the size needs to adjust to
1706 // maintain a constant alignment.
1707 std::string
fill_data(object
->target()->code_fill(fill_len
));
1708 Output_data_const
* odc
= new Output_data_const(fill_data
, 1);
1709 this->input_sections_
.push_back(Input_section(odc
));
1713 this->set_current_data_size_for_child(aligned_offset_in_section
1714 + shdr
.get_sh_size());
1716 // We need to keep track of this section if we are already keeping
1717 // track of sections, or if we are relaxing. Also, if this is a
1718 // section which requires sorting, or which may require sorting in
1719 // the future, we keep track of the sections. FIXME: Add test for
1721 if (have_sections_script
1722 || !this->input_sections_
.empty()
1723 || this->may_sort_attached_input_sections()
1724 || this->must_sort_attached_input_sections())
1725 this->input_sections_
.push_back(Input_section(object
, shndx
,
1729 return aligned_offset_in_section
;
1732 // Add arbitrary data to an output section.
1735 Output_section::add_output_section_data(Output_section_data
* posd
)
1737 Input_section
inp(posd
);
1738 this->add_output_section_data(&inp
);
1740 if (posd
->is_data_size_valid())
1742 off_t offset_in_section
= this->current_data_size_for_child();
1743 off_t aligned_offset_in_section
= align_address(offset_in_section
,
1745 this->set_current_data_size_for_child(aligned_offset_in_section
1746 + posd
->data_size());
1750 // Add arbitrary data to an output section by Input_section.
1753 Output_section::add_output_section_data(Input_section
* inp
)
1755 if (this->input_sections_
.empty())
1756 this->first_input_offset_
= this->current_data_size_for_child();
1758 this->input_sections_
.push_back(*inp
);
1760 uint64_t addralign
= inp
->addralign();
1761 if (addralign
> this->addralign_
)
1762 this->addralign_
= addralign
;
1764 inp
->set_output_section(this);
1767 // Add a merge section to an output section.
1770 Output_section::add_output_merge_section(Output_section_data
* posd
,
1771 bool is_string
, uint64_t entsize
)
1773 Input_section
inp(posd
, is_string
, entsize
);
1774 this->add_output_section_data(&inp
);
1777 // Add an input section to a SHF_MERGE section.
1780 Output_section::add_merge_input_section(Relobj
* object
, unsigned int shndx
,
1781 uint64_t flags
, uint64_t entsize
,
1784 bool is_string
= (flags
& elfcpp::SHF_STRINGS
) != 0;
1786 // We only merge strings if the alignment is not more than the
1787 // character size. This could be handled, but it's unusual.
1788 if (is_string
&& addralign
> entsize
)
1791 Input_section_list::iterator p
;
1792 for (p
= this->input_sections_
.begin();
1793 p
!= this->input_sections_
.end();
1795 if (p
->is_merge_section(is_string
, entsize
, addralign
))
1797 p
->add_input_section(object
, shndx
);
1801 // We handle the actual constant merging in Output_merge_data or
1802 // Output_merge_string_data.
1803 Output_section_data
* posd
;
1805 posd
= new Output_merge_data(entsize
, addralign
);
1811 posd
= new Output_merge_string
<char>(addralign
);
1814 posd
= new Output_merge_string
<uint16_t>(addralign
);
1817 posd
= new Output_merge_string
<uint32_t>(addralign
);
1824 this->add_output_merge_section(posd
, is_string
, entsize
);
1825 posd
->add_input_section(object
, shndx
);
1830 // Given an address OFFSET relative to the start of input section
1831 // SHNDX in OBJECT, return whether this address is being included in
1832 // the final link. This should only be called if SHNDX in OBJECT has
1833 // a special mapping.
1836 Output_section::is_input_address_mapped(const Relobj
* object
,
1840 gold_assert(object
->is_section_specially_mapped(shndx
));
1842 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1843 p
!= this->input_sections_
.end();
1846 section_offset_type output_offset
;
1847 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1848 return output_offset
!= -1;
1851 // By default we assume that the address is mapped. This should
1852 // only be called after we have passed all sections to Layout. At
1853 // that point we should know what we are discarding.
1857 // Given an address OFFSET relative to the start of input section
1858 // SHNDX in object OBJECT, return the output offset relative to the
1859 // start of the input section in the output section. This should only
1860 // be called if SHNDX in OBJECT has a special mapping.
1863 Output_section::output_offset(const Relobj
* object
, unsigned int shndx
,
1864 section_offset_type offset
) const
1866 gold_assert(object
->is_section_specially_mapped(shndx
));
1867 // This can only be called meaningfully when layout is complete.
1868 gold_assert(Output_data::is_layout_complete());
1870 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1871 p
!= this->input_sections_
.end();
1874 section_offset_type output_offset
;
1875 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1876 return output_offset
;
1881 // Return the output virtual address of OFFSET relative to the start
1882 // of input section SHNDX in object OBJECT.
1885 Output_section::output_address(const Relobj
* object
, unsigned int shndx
,
1888 gold_assert(object
->is_section_specially_mapped(shndx
));
1890 uint64_t addr
= this->address() + this->first_input_offset_
;
1891 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1892 p
!= this->input_sections_
.end();
1895 addr
= align_address(addr
, p
->addralign());
1896 section_offset_type output_offset
;
1897 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
1899 if (output_offset
== -1)
1901 return addr
+ output_offset
;
1903 addr
+= p
->data_size();
1906 // If we get here, it means that we don't know the mapping for this
1907 // input section. This might happen in principle if
1908 // add_input_section were called before add_output_section_data.
1909 // But it should never actually happen.
1914 // Return the output address of the start of the merged section for
1915 // input section SHNDX in object OBJECT.
1918 Output_section::starting_output_address(const Relobj
* object
,
1919 unsigned int shndx
) const
1921 gold_assert(object
->is_section_specially_mapped(shndx
));
1923 uint64_t addr
= this->address() + this->first_input_offset_
;
1924 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
1925 p
!= this->input_sections_
.end();
1928 addr
= align_address(addr
, p
->addralign());
1930 // It would be nice if we could use the existing output_offset
1931 // method to get the output offset of input offset 0.
1932 // Unfortunately we don't know for sure that input offset 0 is
1934 if (p
->is_merge_section_for(object
, shndx
))
1937 addr
+= p
->data_size();
1942 // Set the data size of an Output_section. This is where we handle
1943 // setting the addresses of any Output_section_data objects.
1946 Output_section::set_final_data_size()
1948 if (this->input_sections_
.empty())
1950 this->set_data_size(this->current_data_size_for_child());
1954 if (this->must_sort_attached_input_sections())
1955 this->sort_attached_input_sections();
1957 uint64_t address
= this->address();
1958 off_t startoff
= this->offset();
1959 off_t off
= startoff
+ this->first_input_offset_
;
1960 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1961 p
!= this->input_sections_
.end();
1964 off
= align_address(off
, p
->addralign());
1965 p
->set_address_and_file_offset(address
+ (off
- startoff
), off
,
1967 off
+= p
->data_size();
1970 this->set_data_size(off
- startoff
);
1973 // Reset the address and file offset.
1976 Output_section::do_reset_address_and_file_offset()
1978 for (Input_section_list::iterator p
= this->input_sections_
.begin();
1979 p
!= this->input_sections_
.end();
1981 p
->reset_address_and_file_offset();
1984 // Set the TLS offset. Called only for SHT_TLS sections.
1987 Output_section::do_set_tls_offset(uint64_t tls_base
)
1989 this->tls_offset_
= this->address() - tls_base
;
1992 // In a few cases we need to sort the input sections attached to an
1993 // output section. This is used to implement the type of constructor
1994 // priority ordering implemented by the GNU linker, in which the
1995 // priority becomes part of the section name and the sections are
1996 // sorted by name. We only do this for an output section if we see an
1997 // attached input section matching ".ctor.*", ".dtor.*",
1998 // ".init_array.*" or ".fini_array.*".
2000 class Output_section::Input_section_sort_entry
2003 Input_section_sort_entry()
2004 : input_section_(), index_(-1U), section_has_name_(false),
2008 Input_section_sort_entry(const Input_section
& input_section
,
2010 : input_section_(input_section
), index_(index
),
2011 section_has_name_(input_section
.is_input_section())
2013 if (this->section_has_name_
)
2015 // This is only called single-threaded from Layout::finalize,
2016 // so it is OK to lock. Unfortunately we have no way to pass
2018 const Task
* dummy_task
= reinterpret_cast<const Task
*>(-1);
2019 Object
* obj
= input_section
.relobj();
2020 Task_lock_obj
<Object
> tl(dummy_task
, obj
);
2022 // This is a slow operation, which should be cached in
2023 // Layout::layout if this becomes a speed problem.
2024 this->section_name_
= obj
->section_name(input_section
.shndx());
2028 // Return the Input_section.
2029 const Input_section
&
2030 input_section() const
2032 gold_assert(this->index_
!= -1U);
2033 return this->input_section_
;
2036 // The index of this entry in the original list. This is used to
2037 // make the sort stable.
2041 gold_assert(this->index_
!= -1U);
2042 return this->index_
;
2045 // Whether there is a section name.
2047 section_has_name() const
2048 { return this->section_has_name_
; }
2050 // The section name.
2052 section_name() const
2054 gold_assert(this->section_has_name_
);
2055 return this->section_name_
;
2058 // Return true if the section name is either SECTION_NAME1 or
2061 match_section_name(const char* section_name1
, const char* section_name2
) const
2063 gold_assert(this->section_has_name_
);
2064 return (this->section_name_
== section_name1
2065 || this->section_name_
== section_name2
);
2068 // Return true if PREFIX1 or PREFIX2 is a prefix of the section
2071 match_section_name_prefix(const char* prefix1
, const char* prefix2
) const
2073 gold_assert(this->section_has_name_
);
2074 return (this->section_name_
.compare(0, strlen(prefix1
), prefix1
) == 0
2075 || this->section_name_
.compare(0, strlen(prefix2
), prefix2
) == 0);
2078 // Return true if this is for a section named SECTION_NAME1 or
2079 // SECTION_NAME2 in an input file whose base name matches FILE_NAME.
2080 // The base name must have an extension of ".o", and must be exactly
2081 // FILE_NAME.o or FILE_NAME, one character, ".o". This is to match
2082 // crtbegin.o as well as crtbeginS.o without getting confused by
2083 // other possibilities. Overall matching the file name this way is
2084 // a dreadful hack, but the GNU linker does it in order to better
2085 // support gcc, and we need to be compatible.
2087 match_section_file(const char* section_name1
, const char* section_name2
,
2088 const char* match_file_name
) const
2090 gold_assert(this->section_has_name_
);
2091 if (this->section_name_
!= section_name1
2092 && this->section_name_
!= section_name2
)
2094 const std::string
& file_name(this->input_section_
.relobj()->name());
2095 const char* base_name
= lbasename(file_name
.c_str());
2096 size_t match_len
= strlen(match_file_name
);
2097 if (strncmp(base_name
, match_file_name
, match_len
) != 0)
2099 size_t base_len
= strlen(base_name
);
2100 if (base_len
!= match_len
+ 2 && base_len
!= match_len
+ 3)
2102 return memcmp(base_name
+ base_len
- 2, ".o", 2) == 0;
2106 // The Input_section we are sorting.
2107 Input_section input_section_
;
2108 // The index of this Input_section in the original list.
2109 unsigned int index_
;
2110 // Whether this Input_section has a section name--it won't if this
2111 // is some random Output_section_data.
2112 bool section_has_name_
;
2113 // The section name if there is one.
2114 std::string section_name_
;
2117 // Return true if S1 should come before S2 in the output section.
2120 Output_section::Input_section_sort_compare::operator()(
2121 const Output_section::Input_section_sort_entry
& s1
,
2122 const Output_section::Input_section_sort_entry
& s2
) const
2124 // We sort all the sections with no names to the end.
2125 if (!s1
.section_has_name() || !s2
.section_has_name())
2127 if (s1
.section_has_name())
2129 if (s2
.section_has_name())
2131 return s1
.index() < s2
.index();
2134 // A .ctors or .dtors section from crtbegin.o must come before any
2135 // other .ctors* or .dtors* section.
2136 bool s1_begin
= s1
.match_section_file(".ctors", ".dtors", "crtbegin");
2137 bool s2_begin
= s2
.match_section_file(".ctors", ".dtors", "crtbegin");
2138 if (s1_begin
|| s2_begin
)
2144 return s1
.index() < s2
.index();
2147 // A .ctors or .dtors section from crtend.o must come after any
2148 // other .ctors* or .dtors* section.
2149 bool s1_end
= s1
.match_section_file(".ctors", ".dtors", "crtend");
2150 bool s2_end
= s2
.match_section_file(".ctors", ".dtors", "crtend");
2151 if (s1_end
|| s2_end
)
2157 return s1
.index() < s2
.index();
2160 // A .ctors or .init_array section with a priority precedes a .ctors
2161 // or .init_array section without a priority.
2162 if (s1
.match_section_name_prefix(".ctors.", ".init_array.")
2163 && s2
.match_section_name(".ctors", ".init_array"))
2165 if (s2
.match_section_name_prefix(".ctors.", ".init_array.")
2166 && s1
.match_section_name(".ctors", ".init_array"))
2169 // A .dtors or .fini_array section with a priority follows a .dtors
2170 // or .fini_array section without a priority.
2171 if (s1
.match_section_name_prefix(".dtors.", ".fini_array.")
2172 && s2
.match_section_name(".dtors", ".fini_array"))
2174 if (s2
.match_section_name_prefix(".dtors.", ".fini_array.")
2175 && s1
.match_section_name(".dtors", ".fini_array"))
2178 // Otherwise we sort by name.
2179 int compare
= s1
.section_name().compare(s2
.section_name());
2183 // Otherwise we keep the input order.
2184 return s1
.index() < s2
.index();
2187 // Sort the input sections attached to an output section.
2190 Output_section::sort_attached_input_sections()
2192 if (this->attached_input_sections_are_sorted_
)
2195 // The only thing we know about an input section is the object and
2196 // the section index. We need the section name. Recomputing this
2197 // is slow but this is an unusual case. If this becomes a speed
2198 // problem we can cache the names as required in Layout::layout.
2200 // We start by building a larger vector holding a copy of each
2201 // Input_section, plus its current index in the list and its name.
2202 std::vector
<Input_section_sort_entry
> sort_list
;
2205 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2206 p
!= this->input_sections_
.end();
2208 sort_list
.push_back(Input_section_sort_entry(*p
, i
));
2210 // Sort the input sections.
2211 std::sort(sort_list
.begin(), sort_list
.end(), Input_section_sort_compare());
2213 // Copy the sorted input sections back to our list.
2214 this->input_sections_
.clear();
2215 for (std::vector
<Input_section_sort_entry
>::iterator p
= sort_list
.begin();
2216 p
!= sort_list
.end();
2218 this->input_sections_
.push_back(p
->input_section());
2220 // Remember that we sorted the input sections, since we might get
2222 this->attached_input_sections_are_sorted_
= true;
2225 // Write the section header to *OSHDR.
2227 template<int size
, bool big_endian
>
2229 Output_section::write_header(const Layout
* layout
,
2230 const Stringpool
* secnamepool
,
2231 elfcpp::Shdr_write
<size
, big_endian
>* oshdr
) const
2233 oshdr
->put_sh_name(secnamepool
->get_offset(this->name_
));
2234 oshdr
->put_sh_type(this->type_
);
2236 elfcpp::Elf_Xword flags
= this->flags_
;
2237 if (this->info_section_
!= NULL
&& this->info_uses_section_index_
)
2238 flags
|= elfcpp::SHF_INFO_LINK
;
2239 oshdr
->put_sh_flags(flags
);
2241 oshdr
->put_sh_addr(this->address());
2242 oshdr
->put_sh_offset(this->offset());
2243 oshdr
->put_sh_size(this->data_size());
2244 if (this->link_section_
!= NULL
)
2245 oshdr
->put_sh_link(this->link_section_
->out_shndx());
2246 else if (this->should_link_to_symtab_
)
2247 oshdr
->put_sh_link(layout
->symtab_section()->out_shndx());
2248 else if (this->should_link_to_dynsym_
)
2249 oshdr
->put_sh_link(layout
->dynsym_section()->out_shndx());
2251 oshdr
->put_sh_link(this->link_
);
2253 elfcpp::Elf_Word info
;
2254 if (this->info_section_
!= NULL
)
2256 if (this->info_uses_section_index_
)
2257 info
= this->info_section_
->out_shndx();
2259 info
= this->info_section_
->symtab_index();
2261 else if (this->info_symndx_
!= NULL
)
2262 info
= this->info_symndx_
->symtab_index();
2265 oshdr
->put_sh_info(info
);
2267 oshdr
->put_sh_addralign(this->addralign_
);
2268 oshdr
->put_sh_entsize(this->entsize_
);
2271 // Write out the data. For input sections the data is written out by
2272 // Object::relocate, but we have to handle Output_section_data objects
2276 Output_section::do_write(Output_file
* of
)
2278 gold_assert(!this->requires_postprocessing());
2280 off_t output_section_file_offset
= this->offset();
2281 for (Fill_list::iterator p
= this->fills_
.begin();
2282 p
!= this->fills_
.end();
2285 std::string
fill_data(parameters
->target().code_fill(p
->length()));
2286 of
->write(output_section_file_offset
+ p
->section_offset(),
2287 fill_data
.data(), fill_data
.size());
2290 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2291 p
!= this->input_sections_
.end();
2296 // If a section requires postprocessing, create the buffer to use.
2299 Output_section::create_postprocessing_buffer()
2301 gold_assert(this->requires_postprocessing());
2303 if (this->postprocessing_buffer_
!= NULL
)
2306 if (!this->input_sections_
.empty())
2308 off_t off
= this->first_input_offset_
;
2309 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2310 p
!= this->input_sections_
.end();
2313 off
= align_address(off
, p
->addralign());
2314 p
->finalize_data_size();
2315 off
+= p
->data_size();
2317 this->set_current_data_size_for_child(off
);
2320 off_t buffer_size
= this->current_data_size_for_child();
2321 this->postprocessing_buffer_
= new unsigned char[buffer_size
];
2324 // Write all the data of an Output_section into the postprocessing
2325 // buffer. This is used for sections which require postprocessing,
2326 // such as compression. Input sections are handled by
2327 // Object::Relocate.
2330 Output_section::write_to_postprocessing_buffer()
2332 gold_assert(this->requires_postprocessing());
2334 unsigned char* buffer
= this->postprocessing_buffer();
2335 for (Fill_list::iterator p
= this->fills_
.begin();
2336 p
!= this->fills_
.end();
2339 std::string
fill_data(parameters
->target().code_fill(p
->length()));
2340 memcpy(buffer
+ p
->section_offset(), fill_data
.data(),
2344 off_t off
= this->first_input_offset_
;
2345 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2346 p
!= this->input_sections_
.end();
2349 off
= align_address(off
, p
->addralign());
2350 p
->write_to_buffer(buffer
+ off
);
2351 off
+= p
->data_size();
2355 // Get the input sections for linker script processing. We leave
2356 // behind the Output_section_data entries. Note that this may be
2357 // slightly incorrect for merge sections. We will leave them behind,
2358 // but it is possible that the script says that they should follow
2359 // some other input sections, as in:
2360 // .rodata { *(.rodata) *(.rodata.cst*) }
2361 // For that matter, we don't handle this correctly:
2362 // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) }
2363 // With luck this will never matter.
2366 Output_section::get_input_sections(
2368 const std::string
& fill
,
2369 std::list
<std::pair
<Relobj
*, unsigned int> >* input_sections
)
2371 uint64_t orig_address
= address
;
2373 address
= align_address(address
, this->addralign());
2375 Input_section_list remaining
;
2376 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2377 p
!= this->input_sections_
.end();
2380 if (p
->is_input_section())
2381 input_sections
->push_back(std::make_pair(p
->relobj(), p
->shndx()));
2384 uint64_t aligned_address
= align_address(address
, p
->addralign());
2385 if (aligned_address
!= address
&& !fill
.empty())
2387 section_size_type length
=
2388 convert_to_section_size_type(aligned_address
- address
);
2389 std::string this_fill
;
2390 this_fill
.reserve(length
);
2391 while (this_fill
.length() + fill
.length() <= length
)
2393 if (this_fill
.length() < length
)
2394 this_fill
.append(fill
, 0, length
- this_fill
.length());
2396 Output_section_data
* posd
= new Output_data_const(this_fill
, 0);
2397 remaining
.push_back(Input_section(posd
));
2399 address
= aligned_address
;
2401 remaining
.push_back(*p
);
2403 p
->finalize_data_size();
2404 address
+= p
->data_size();
2408 this->input_sections_
.swap(remaining
);
2409 this->first_input_offset_
= 0;
2411 uint64_t data_size
= address
- orig_address
;
2412 this->set_current_data_size_for_child(data_size
);
2416 // Add an input section from a script.
2419 Output_section::add_input_section_for_script(Relobj
* object
,
2424 if (addralign
> this->addralign_
)
2425 this->addralign_
= addralign
;
2427 off_t offset_in_section
= this->current_data_size_for_child();
2428 off_t aligned_offset_in_section
= align_address(offset_in_section
,
2431 this->set_current_data_size_for_child(aligned_offset_in_section
2434 this->input_sections_
.push_back(Input_section(object
, shndx
,
2435 data_size
, addralign
));
2438 // Print stats for merge sections to stderr.
2441 Output_section::print_merge_stats()
2443 Input_section_list::iterator p
;
2444 for (p
= this->input_sections_
.begin();
2445 p
!= this->input_sections_
.end();
2447 p
->print_merge_stats(this->name_
);
2450 // Output segment methods.
2452 Output_segment::Output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
2464 is_max_align_known_(false),
2465 are_addresses_set_(false)
2469 // Add an Output_section to an Output_segment.
2472 Output_segment::add_output_section(Output_section
* os
,
2473 elfcpp::Elf_Word seg_flags
,
2476 gold_assert((os
->flags() & elfcpp::SHF_ALLOC
) != 0);
2477 gold_assert(!this->is_max_align_known_
);
2479 // Update the segment flags.
2480 this->flags_
|= seg_flags
;
2482 Output_segment::Output_data_list
* pdl
;
2483 if (os
->type() == elfcpp::SHT_NOBITS
)
2484 pdl
= &this->output_bss_
;
2486 pdl
= &this->output_data_
;
2488 // So that PT_NOTE segments will work correctly, we need to ensure
2489 // that all SHT_NOTE sections are adjacent. This will normally
2490 // happen automatically, because all the SHT_NOTE input sections
2491 // will wind up in the same output section. However, it is possible
2492 // for multiple SHT_NOTE input sections to have different section
2493 // flags, and thus be in different output sections, but for the
2494 // different section flags to map into the same segment flags and
2495 // thus the same output segment.
2497 // Note that while there may be many input sections in an output
2498 // section, there are normally only a few output sections in an
2499 // output segment. This loop is expected to be fast.
2501 if (os
->type() == elfcpp::SHT_NOTE
&& !pdl
->empty())
2503 Output_segment::Output_data_list::iterator p
= pdl
->end();
2507 if ((*p
)->is_section_type(elfcpp::SHT_NOTE
))
2509 // We don't worry about the FRONT parameter.
2515 while (p
!= pdl
->begin());
2518 // Similarly, so that PT_TLS segments will work, we need to group
2519 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
2520 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
2521 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
2522 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
2523 // and the PT_TLS segment -- we do this grouping only for the
2525 if (this->type_
!= elfcpp::PT_TLS
2526 && (os
->flags() & elfcpp::SHF_TLS
) != 0
2527 && !this->output_data_
.empty())
2529 pdl
= &this->output_data_
;
2530 bool nobits
= os
->type() == elfcpp::SHT_NOBITS
;
2531 bool sawtls
= false;
2532 Output_segment::Output_data_list::iterator p
= pdl
->end();
2537 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
2540 // Put a NOBITS section after the first TLS section.
2541 // But a PROGBITS section after the first TLS/PROGBITS
2543 insert
= nobits
|| !(*p
)->is_section_type(elfcpp::SHT_NOBITS
);
2547 // If we've gone past the TLS sections, but we've seen a
2548 // TLS section, then we need to insert this section now.
2554 // We don't worry about the FRONT parameter.
2560 while (p
!= pdl
->begin());
2562 // There are no TLS sections yet; put this one at the requested
2563 // location in the section list.
2567 pdl
->push_front(os
);
2572 // Remove an Output_section from this segment. It is an error if it
2576 Output_segment::remove_output_section(Output_section
* os
)
2578 // We only need this for SHT_PROGBITS.
2579 gold_assert(os
->type() == elfcpp::SHT_PROGBITS
);
2580 for (Output_data_list::iterator p
= this->output_data_
.begin();
2581 p
!= this->output_data_
.end();
2586 this->output_data_
.erase(p
);
2593 // Add an Output_data (which is not an Output_section) to the start of
2597 Output_segment::add_initial_output_data(Output_data
* od
)
2599 gold_assert(!this->is_max_align_known_
);
2600 this->output_data_
.push_front(od
);
2603 // Return the maximum alignment of the Output_data in Output_segment.
2606 Output_segment::maximum_alignment()
2608 if (!this->is_max_align_known_
)
2612 addralign
= Output_segment::maximum_alignment_list(&this->output_data_
);
2613 if (addralign
> this->max_align_
)
2614 this->max_align_
= addralign
;
2616 addralign
= Output_segment::maximum_alignment_list(&this->output_bss_
);
2617 if (addralign
> this->max_align_
)
2618 this->max_align_
= addralign
;
2620 this->is_max_align_known_
= true;
2623 return this->max_align_
;
2626 // Return the maximum alignment of a list of Output_data.
2629 Output_segment::maximum_alignment_list(const Output_data_list
* pdl
)
2632 for (Output_data_list::const_iterator p
= pdl
->begin();
2636 uint64_t addralign
= (*p
)->addralign();
2637 if (addralign
> ret
)
2643 // Return the number of dynamic relocs applied to this segment.
2646 Output_segment::dynamic_reloc_count() const
2648 return (this->dynamic_reloc_count_list(&this->output_data_
)
2649 + this->dynamic_reloc_count_list(&this->output_bss_
));
2652 // Return the number of dynamic relocs applied to an Output_data_list.
2655 Output_segment::dynamic_reloc_count_list(const Output_data_list
* pdl
) const
2657 unsigned int count
= 0;
2658 for (Output_data_list::const_iterator p
= pdl
->begin();
2661 count
+= (*p
)->dynamic_reloc_count();
2665 // Set the section addresses for an Output_segment. If RESET is true,
2666 // reset the addresses first. ADDR is the address and *POFF is the
2667 // file offset. Set the section indexes starting with *PSHNDX.
2668 // Return the address of the immediately following segment. Update
2669 // *POFF and *PSHNDX.
2672 Output_segment::set_section_addresses(const Layout
* layout
, bool reset
,
2673 uint64_t addr
, off_t
* poff
,
2674 unsigned int* pshndx
)
2676 gold_assert(this->type_
== elfcpp::PT_LOAD
);
2678 if (!reset
&& this->are_addresses_set_
)
2680 gold_assert(this->paddr_
== addr
);
2681 addr
= this->vaddr_
;
2685 this->vaddr_
= addr
;
2686 this->paddr_
= addr
;
2687 this->are_addresses_set_
= true;
2690 bool in_tls
= false;
2692 off_t orig_off
= *poff
;
2693 this->offset_
= orig_off
;
2695 addr
= this->set_section_list_addresses(layout
, reset
, &this->output_data_
,
2696 addr
, poff
, pshndx
, &in_tls
);
2697 this->filesz_
= *poff
- orig_off
;
2701 uint64_t ret
= this->set_section_list_addresses(layout
, reset
,
2706 // If the last section was a TLS section, align upward to the
2707 // alignment of the TLS segment, so that the overall size of the TLS
2708 // segment is aligned.
2711 uint64_t segment_align
= layout
->tls_segment()->maximum_alignment();
2712 *poff
= align_address(*poff
, segment_align
);
2715 this->memsz_
= *poff
- orig_off
;
2717 // Ignore the file offset adjustments made by the BSS Output_data
2724 // Set the addresses and file offsets in a list of Output_data
2728 Output_segment::set_section_list_addresses(const Layout
* layout
, bool reset
,
2729 Output_data_list
* pdl
,
2730 uint64_t addr
, off_t
* poff
,
2731 unsigned int* pshndx
,
2734 off_t startoff
= *poff
;
2736 off_t off
= startoff
;
2737 for (Output_data_list::iterator p
= pdl
->begin();
2742 (*p
)->reset_address_and_file_offset();
2744 // When using a linker script the section will most likely
2745 // already have an address.
2746 if (!(*p
)->is_address_valid())
2748 uint64_t align
= (*p
)->addralign();
2750 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
2752 // Give the first TLS section the alignment of the
2753 // entire TLS segment. Otherwise the TLS segment as a
2754 // whole may be misaligned.
2757 Output_segment
* tls_segment
= layout
->tls_segment();
2758 gold_assert(tls_segment
!= NULL
);
2759 uint64_t segment_align
= tls_segment
->maximum_alignment();
2760 gold_assert(segment_align
>= align
);
2761 align
= segment_align
;
2768 // If this is the first section after the TLS segment,
2769 // align it to at least the alignment of the TLS
2770 // segment, so that the size of the overall TLS segment
2774 uint64_t segment_align
=
2775 layout
->tls_segment()->maximum_alignment();
2776 if (segment_align
> align
)
2777 align
= segment_align
;
2783 off
= align_address(off
, align
);
2784 (*p
)->set_address_and_file_offset(addr
+ (off
- startoff
), off
);
2788 // The script may have inserted a skip forward, but it
2789 // better not have moved backward.
2790 gold_assert((*p
)->address() >= addr
+ (off
- startoff
));
2791 off
+= (*p
)->address() - (addr
+ (off
- startoff
));
2792 (*p
)->set_file_offset(off
);
2793 (*p
)->finalize_data_size();
2796 // We want to ignore the size of a SHF_TLS or SHT_NOBITS
2797 // section. Such a section does not affect the size of a
2799 if (!(*p
)->is_section_flag_set(elfcpp::SHF_TLS
)
2800 || !(*p
)->is_section_type(elfcpp::SHT_NOBITS
))
2801 off
+= (*p
)->data_size();
2803 if ((*p
)->is_section())
2805 (*p
)->set_out_shndx(*pshndx
);
2811 return addr
+ (off
- startoff
);
2814 // For a non-PT_LOAD segment, set the offset from the sections, if
2818 Output_segment::set_offset()
2820 gold_assert(this->type_
!= elfcpp::PT_LOAD
);
2822 gold_assert(!this->are_addresses_set_
);
2824 if (this->output_data_
.empty() && this->output_bss_
.empty())
2828 this->are_addresses_set_
= true;
2830 this->min_p_align_
= 0;
2836 const Output_data
* first
;
2837 if (this->output_data_
.empty())
2838 first
= this->output_bss_
.front();
2840 first
= this->output_data_
.front();
2841 this->vaddr_
= first
->address();
2842 this->paddr_
= (first
->has_load_address()
2843 ? first
->load_address()
2845 this->are_addresses_set_
= true;
2846 this->offset_
= first
->offset();
2848 if (this->output_data_
.empty())
2852 const Output_data
* last_data
= this->output_data_
.back();
2853 this->filesz_
= (last_data
->address()
2854 + last_data
->data_size()
2858 const Output_data
* last
;
2859 if (this->output_bss_
.empty())
2860 last
= this->output_data_
.back();
2862 last
= this->output_bss_
.back();
2863 this->memsz_
= (last
->address()
2867 // If this is a TLS segment, align the memory size. The code in
2868 // set_section_list ensures that the section after the TLS segment
2869 // is aligned to give us room.
2870 if (this->type_
== elfcpp::PT_TLS
)
2872 uint64_t segment_align
= this->maximum_alignment();
2873 gold_assert(this->vaddr_
== align_address(this->vaddr_
, segment_align
));
2874 this->memsz_
= align_address(this->memsz_
, segment_align
);
2878 // Set the TLS offsets of the sections in the PT_TLS segment.
2881 Output_segment::set_tls_offsets()
2883 gold_assert(this->type_
== elfcpp::PT_TLS
);
2885 for (Output_data_list::iterator p
= this->output_data_
.begin();
2886 p
!= this->output_data_
.end();
2888 (*p
)->set_tls_offset(this->vaddr_
);
2890 for (Output_data_list::iterator p
= this->output_bss_
.begin();
2891 p
!= this->output_bss_
.end();
2893 (*p
)->set_tls_offset(this->vaddr_
);
2896 // Return the address of the first section.
2899 Output_segment::first_section_load_address() const
2901 for (Output_data_list::const_iterator p
= this->output_data_
.begin();
2902 p
!= this->output_data_
.end();
2904 if ((*p
)->is_section())
2905 return (*p
)->has_load_address() ? (*p
)->load_address() : (*p
)->address();
2907 for (Output_data_list::const_iterator p
= this->output_bss_
.begin();
2908 p
!= this->output_bss_
.end();
2910 if ((*p
)->is_section())
2911 return (*p
)->has_load_address() ? (*p
)->load_address() : (*p
)->address();
2916 // Return the number of Output_sections in an Output_segment.
2919 Output_segment::output_section_count() const
2921 return (this->output_section_count_list(&this->output_data_
)
2922 + this->output_section_count_list(&this->output_bss_
));
2925 // Return the number of Output_sections in an Output_data_list.
2928 Output_segment::output_section_count_list(const Output_data_list
* pdl
) const
2930 unsigned int count
= 0;
2931 for (Output_data_list::const_iterator p
= pdl
->begin();
2935 if ((*p
)->is_section())
2941 // Return the section attached to the list segment with the lowest
2942 // load address. This is used when handling a PHDRS clause in a
2946 Output_segment::section_with_lowest_load_address() const
2948 Output_section
* found
= NULL
;
2949 uint64_t found_lma
= 0;
2950 this->lowest_load_address_in_list(&this->output_data_
, &found
, &found_lma
);
2952 Output_section
* found_data
= found
;
2953 this->lowest_load_address_in_list(&this->output_bss_
, &found
, &found_lma
);
2954 if (found
!= found_data
&& found_data
!= NULL
)
2956 gold_error(_("nobits section %s may not precede progbits section %s "
2958 found
->name(), found_data
->name());
2965 // Look through a list for a section with a lower load address.
2968 Output_segment::lowest_load_address_in_list(const Output_data_list
* pdl
,
2969 Output_section
** found
,
2970 uint64_t* found_lma
) const
2972 for (Output_data_list::const_iterator p
= pdl
->begin();
2976 if (!(*p
)->is_section())
2978 Output_section
* os
= static_cast<Output_section
*>(*p
);
2979 uint64_t lma
= (os
->has_load_address()
2980 ? os
->load_address()
2982 if (*found
== NULL
|| lma
< *found_lma
)
2990 // Write the segment data into *OPHDR.
2992 template<int size
, bool big_endian
>
2994 Output_segment::write_header(elfcpp::Phdr_write
<size
, big_endian
>* ophdr
)
2996 ophdr
->put_p_type(this->type_
);
2997 ophdr
->put_p_offset(this->offset_
);
2998 ophdr
->put_p_vaddr(this->vaddr_
);
2999 ophdr
->put_p_paddr(this->paddr_
);
3000 ophdr
->put_p_filesz(this->filesz_
);
3001 ophdr
->put_p_memsz(this->memsz_
);
3002 ophdr
->put_p_flags(this->flags_
);
3003 ophdr
->put_p_align(std::max(this->min_p_align_
, this->maximum_alignment()));
3006 // Write the section headers into V.
3008 template<int size
, bool big_endian
>
3010 Output_segment::write_section_headers(const Layout
* layout
,
3011 const Stringpool
* secnamepool
,
3013 unsigned int *pshndx
) const
3015 // Every section that is attached to a segment must be attached to a
3016 // PT_LOAD segment, so we only write out section headers for PT_LOAD
3018 if (this->type_
!= elfcpp::PT_LOAD
)
3021 v
= this->write_section_headers_list
<size
, big_endian
>(layout
, secnamepool
,
3022 &this->output_data_
,
3024 v
= this->write_section_headers_list
<size
, big_endian
>(layout
, secnamepool
,
3030 template<int size
, bool big_endian
>
3032 Output_segment::write_section_headers_list(const Layout
* layout
,
3033 const Stringpool
* secnamepool
,
3034 const Output_data_list
* pdl
,
3036 unsigned int* pshndx
) const
3038 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
3039 for (Output_data_list::const_iterator p
= pdl
->begin();
3043 if ((*p
)->is_section())
3045 const Output_section
* ps
= static_cast<const Output_section
*>(*p
);
3046 gold_assert(*pshndx
== ps
->out_shndx());
3047 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
3048 ps
->write_header(layout
, secnamepool
, &oshdr
);
3056 // Output_file methods.
3058 Output_file::Output_file(const char* name
)
3063 map_is_anonymous_(false),
3064 is_temporary_(false)
3068 // Open the output file.
3071 Output_file::open(off_t file_size
)
3073 this->file_size_
= file_size
;
3075 // Unlink the file first; otherwise the open() may fail if the file
3076 // is busy (e.g. it's an executable that's currently being executed).
3078 // However, the linker may be part of a system where a zero-length
3079 // file is created for it to write to, with tight permissions (gcc
3080 // 2.95 did something like this). Unlinking the file would work
3081 // around those permission controls, so we only unlink if the file
3082 // has a non-zero size. We also unlink only regular files to avoid
3083 // trouble with directories/etc.
3085 // If we fail, continue; this command is merely a best-effort attempt
3086 // to improve the odds for open().
3088 // We let the name "-" mean "stdout"
3089 if (!this->is_temporary_
)
3091 if (strcmp(this->name_
, "-") == 0)
3092 this->o_
= STDOUT_FILENO
;
3096 if (::stat(this->name_
, &s
) == 0 && s
.st_size
!= 0)
3097 unlink_if_ordinary(this->name_
);
3099 int mode
= parameters
->options().relocatable() ? 0666 : 0777;
3100 int o
= ::open(this->name_
, O_RDWR
| O_CREAT
| O_TRUNC
, mode
);
3102 gold_fatal(_("%s: open: %s"), this->name_
, strerror(errno
));
3110 // Resize the output file.
3113 Output_file::resize(off_t file_size
)
3115 // If the mmap is mapping an anonymous memory buffer, this is easy:
3116 // just mremap to the new size. If it's mapping to a file, we want
3117 // to unmap to flush to the file, then remap after growing the file.
3118 if (this->map_is_anonymous_
)
3120 void* base
= ::mremap(this->base_
, this->file_size_
, file_size
,
3122 if (base
== MAP_FAILED
)
3123 gold_fatal(_("%s: mremap: %s"), this->name_
, strerror(errno
));
3124 this->base_
= static_cast<unsigned char*>(base
);
3125 this->file_size_
= file_size
;
3130 this->file_size_
= file_size
;
3135 // Map the file into memory.
3140 const int o
= this->o_
;
3142 // If the output file is not a regular file, don't try to mmap it;
3143 // instead, we'll mmap a block of memory (an anonymous buffer), and
3144 // then later write the buffer to the file.
3146 struct stat statbuf
;
3147 if (o
== STDOUT_FILENO
|| o
== STDERR_FILENO
3148 || ::fstat(o
, &statbuf
) != 0
3149 || !S_ISREG(statbuf
.st_mode
)
3150 || this->is_temporary_
)
3152 this->map_is_anonymous_
= true;
3153 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
3154 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
3158 // Write out one byte to make the file the right size.
3159 if (::lseek(o
, this->file_size_
- 1, SEEK_SET
) < 0)
3160 gold_fatal(_("%s: lseek: %s"), this->name_
, strerror(errno
));
3162 if (::write(o
, &b
, 1) != 1)
3163 gold_fatal(_("%s: write: %s"), this->name_
, strerror(errno
));
3165 // Map the file into memory.
3166 this->map_is_anonymous_
= false;
3167 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
3170 if (base
== MAP_FAILED
)
3171 gold_fatal(_("%s: mmap: %s"), this->name_
, strerror(errno
));
3172 this->base_
= static_cast<unsigned char*>(base
);
3175 // Unmap the file from memory.
3178 Output_file::unmap()
3180 if (::munmap(this->base_
, this->file_size_
) < 0)
3181 gold_error(_("%s: munmap: %s"), this->name_
, strerror(errno
));
3185 // Close the output file.
3188 Output_file::close()
3190 // If the map isn't file-backed, we need to write it now.
3191 if (this->map_is_anonymous_
&& !this->is_temporary_
)
3193 size_t bytes_to_write
= this->file_size_
;
3194 while (bytes_to_write
> 0)
3196 ssize_t bytes_written
= ::write(this->o_
, this->base_
, bytes_to_write
);
3197 if (bytes_written
== 0)
3198 gold_error(_("%s: write: unexpected 0 return-value"), this->name_
);
3199 else if (bytes_written
< 0)
3200 gold_error(_("%s: write: %s"), this->name_
, strerror(errno
));
3202 bytes_to_write
-= bytes_written
;
3207 // We don't close stdout or stderr
3208 if (this->o_
!= STDOUT_FILENO
3209 && this->o_
!= STDERR_FILENO
3210 && !this->is_temporary_
)
3211 if (::close(this->o_
) < 0)
3212 gold_error(_("%s: close: %s"), this->name_
, strerror(errno
));
3216 // Instantiate the templates we need. We could use the configure
3217 // script to restrict this to only the ones for implemented targets.
3219 #ifdef HAVE_TARGET_32_LITTLE
3222 Output_section::add_input_section
<32, false>(
3223 Sized_relobj
<32, false>* object
,
3225 const char* secname
,
3226 const elfcpp::Shdr
<32, false>& shdr
,
3227 unsigned int reloc_shndx
,
3228 bool have_sections_script
);
3231 #ifdef HAVE_TARGET_32_BIG
3234 Output_section::add_input_section
<32, true>(
3235 Sized_relobj
<32, true>* object
,
3237 const char* secname
,
3238 const elfcpp::Shdr
<32, true>& shdr
,
3239 unsigned int reloc_shndx
,
3240 bool have_sections_script
);
3243 #ifdef HAVE_TARGET_64_LITTLE
3246 Output_section::add_input_section
<64, false>(
3247 Sized_relobj
<64, false>* object
,
3249 const char* secname
,
3250 const elfcpp::Shdr
<64, false>& shdr
,
3251 unsigned int reloc_shndx
,
3252 bool have_sections_script
);
3255 #ifdef HAVE_TARGET_64_BIG
3258 Output_section::add_input_section
<64, true>(
3259 Sized_relobj
<64, true>* object
,
3261 const char* secname
,
3262 const elfcpp::Shdr
<64, true>& shdr
,
3263 unsigned int reloc_shndx
,
3264 bool have_sections_script
);
3267 #ifdef HAVE_TARGET_32_LITTLE
3269 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, false>;
3272 #ifdef HAVE_TARGET_32_BIG
3274 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, true>;
3277 #ifdef HAVE_TARGET_64_LITTLE
3279 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, false>;
3282 #ifdef HAVE_TARGET_64_BIG
3284 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, true>;
3287 #ifdef HAVE_TARGET_32_LITTLE
3289 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false>;
3292 #ifdef HAVE_TARGET_32_BIG
3294 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, true>;
3297 #ifdef HAVE_TARGET_64_LITTLE
3299 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, false>;
3302 #ifdef HAVE_TARGET_64_BIG
3304 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, true>;
3307 #ifdef HAVE_TARGET_32_LITTLE
3309 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, false>;
3312 #ifdef HAVE_TARGET_32_BIG
3314 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, true>;
3317 #ifdef HAVE_TARGET_64_LITTLE
3319 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, false>;
3322 #ifdef HAVE_TARGET_64_BIG
3324 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, true>;
3327 #ifdef HAVE_TARGET_32_LITTLE
3329 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, false>;
3332 #ifdef HAVE_TARGET_32_BIG
3334 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, true>;
3337 #ifdef HAVE_TARGET_64_LITTLE
3339 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false>;
3342 #ifdef HAVE_TARGET_64_BIG
3344 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, true>;
3347 #ifdef HAVE_TARGET_32_LITTLE
3349 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 32, false>;
3352 #ifdef HAVE_TARGET_32_BIG
3354 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 32, true>;
3357 #ifdef HAVE_TARGET_64_LITTLE
3359 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 64, false>;
3362 #ifdef HAVE_TARGET_64_BIG
3364 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 64, true>;
3367 #ifdef HAVE_TARGET_32_LITTLE
3369 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 32, false>;
3372 #ifdef HAVE_TARGET_32_BIG
3374 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 32, true>;
3377 #ifdef HAVE_TARGET_64_LITTLE
3379 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 64, false>;
3382 #ifdef HAVE_TARGET_64_BIG
3384 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 64, true>;
3387 #ifdef HAVE_TARGET_32_LITTLE
3389 class Output_data_group
<32, false>;
3392 #ifdef HAVE_TARGET_32_BIG
3394 class Output_data_group
<32, true>;
3397 #ifdef HAVE_TARGET_64_LITTLE
3399 class Output_data_group
<64, false>;
3402 #ifdef HAVE_TARGET_64_BIG
3404 class Output_data_group
<64, true>;
3407 #ifdef HAVE_TARGET_32_LITTLE
3409 class Output_data_got
<32, false>;
3412 #ifdef HAVE_TARGET_32_BIG
3414 class Output_data_got
<32, true>;
3417 #ifdef HAVE_TARGET_64_LITTLE
3419 class Output_data_got
<64, false>;
3422 #ifdef HAVE_TARGET_64_BIG
3424 class Output_data_got
<64, true>;
3427 } // End namespace gold.