1 // output.cc -- manage the output file for gold
3 // Copyright 2006, 2007, 2008, 2009 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"
35 #include "parameters.h"
40 #include "descriptors.h"
43 // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
45 # define MAP_ANONYMOUS MAP_ANON
48 #ifndef HAVE_POSIX_FALLOCATE
49 // A dummy, non general, version of posix_fallocate. Here we just set
50 // the file size and hope that there is enough disk space. FIXME: We
51 // could allocate disk space by walking block by block and writing a
52 // zero byte into each block.
54 posix_fallocate(int o
, off_t offset
, off_t len
)
56 return ftruncate(o
, offset
+ len
);
58 #endif // !defined(HAVE_POSIX_FALLOCATE)
63 // Output_data variables.
65 bool Output_data::allocated_sizes_are_fixed
;
67 // Output_data methods.
69 Output_data::~Output_data()
73 // Return the default alignment for the target size.
76 Output_data::default_alignment()
78 return Output_data::default_alignment_for_size(
79 parameters
->target().get_size());
82 // Return the default alignment for a size--32 or 64.
85 Output_data::default_alignment_for_size(int size
)
95 // Output_section_header methods. This currently assumes that the
96 // segment and section lists are complete at construction time.
98 Output_section_headers::Output_section_headers(
100 const Layout::Segment_list
* segment_list
,
101 const Layout::Section_list
* section_list
,
102 const Layout::Section_list
* unattached_section_list
,
103 const Stringpool
* secnamepool
,
104 const Output_section
* shstrtab_section
)
106 segment_list_(segment_list
),
107 section_list_(section_list
),
108 unattached_section_list_(unattached_section_list
),
109 secnamepool_(secnamepool
),
110 shstrtab_section_(shstrtab_section
)
114 // Compute the current data size.
117 Output_section_headers::do_size() const
119 // Count all the sections. Start with 1 for the null section.
121 if (!parameters
->options().relocatable())
123 for (Layout::Segment_list::const_iterator p
=
124 this->segment_list_
->begin();
125 p
!= this->segment_list_
->end();
127 if ((*p
)->type() == elfcpp::PT_LOAD
)
128 count
+= (*p
)->output_section_count();
132 for (Layout::Section_list::const_iterator p
=
133 this->section_list_
->begin();
134 p
!= this->section_list_
->end();
136 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0)
139 count
+= this->unattached_section_list_
->size();
141 const int size
= parameters
->target().get_size();
144 shdr_size
= elfcpp::Elf_sizes
<32>::shdr_size
;
146 shdr_size
= elfcpp::Elf_sizes
<64>::shdr_size
;
150 return count
* shdr_size
;
153 // Write out the section headers.
156 Output_section_headers::do_write(Output_file
* of
)
158 switch (parameters
->size_and_endianness())
160 #ifdef HAVE_TARGET_32_LITTLE
161 case Parameters::TARGET_32_LITTLE
:
162 this->do_sized_write
<32, false>(of
);
165 #ifdef HAVE_TARGET_32_BIG
166 case Parameters::TARGET_32_BIG
:
167 this->do_sized_write
<32, true>(of
);
170 #ifdef HAVE_TARGET_64_LITTLE
171 case Parameters::TARGET_64_LITTLE
:
172 this->do_sized_write
<64, false>(of
);
175 #ifdef HAVE_TARGET_64_BIG
176 case Parameters::TARGET_64_BIG
:
177 this->do_sized_write
<64, true>(of
);
185 template<int size
, bool big_endian
>
187 Output_section_headers::do_sized_write(Output_file
* of
)
189 off_t all_shdrs_size
= this->data_size();
190 unsigned char* view
= of
->get_output_view(this->offset(), all_shdrs_size
);
192 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
193 unsigned char* v
= view
;
196 typename
elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
197 oshdr
.put_sh_name(0);
198 oshdr
.put_sh_type(elfcpp::SHT_NULL
);
199 oshdr
.put_sh_flags(0);
200 oshdr
.put_sh_addr(0);
201 oshdr
.put_sh_offset(0);
203 size_t section_count
= (this->data_size()
204 / elfcpp::Elf_sizes
<size
>::shdr_size
);
205 if (section_count
< elfcpp::SHN_LORESERVE
)
206 oshdr
.put_sh_size(0);
208 oshdr
.put_sh_size(section_count
);
210 unsigned int shstrndx
= this->shstrtab_section_
->out_shndx();
211 if (shstrndx
< elfcpp::SHN_LORESERVE
)
212 oshdr
.put_sh_link(0);
214 oshdr
.put_sh_link(shstrndx
);
216 size_t segment_count
= this->segment_list_
->size();
217 oshdr
.put_sh_info(segment_count
>= elfcpp::PN_XNUM
? segment_count
: 0);
219 oshdr
.put_sh_addralign(0);
220 oshdr
.put_sh_entsize(0);
225 unsigned int shndx
= 1;
226 if (!parameters
->options().relocatable())
228 for (Layout::Segment_list::const_iterator p
=
229 this->segment_list_
->begin();
230 p
!= this->segment_list_
->end();
232 v
= (*p
)->write_section_headers
<size
, big_endian
>(this->layout_
,
239 for (Layout::Section_list::const_iterator p
=
240 this->section_list_
->begin();
241 p
!= this->section_list_
->end();
244 // We do unallocated sections below, except that group
245 // sections have to come first.
246 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) == 0
247 && (*p
)->type() != elfcpp::SHT_GROUP
)
249 gold_assert(shndx
== (*p
)->out_shndx());
250 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
251 (*p
)->write_header(this->layout_
, this->secnamepool_
, &oshdr
);
257 for (Layout::Section_list::const_iterator p
=
258 this->unattached_section_list_
->begin();
259 p
!= this->unattached_section_list_
->end();
262 // For a relocatable link, we did unallocated group sections
263 // above, since they have to come first.
264 if ((*p
)->type() == elfcpp::SHT_GROUP
265 && parameters
->options().relocatable())
267 gold_assert(shndx
== (*p
)->out_shndx());
268 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
269 (*p
)->write_header(this->layout_
, this->secnamepool_
, &oshdr
);
274 of
->write_output_view(this->offset(), all_shdrs_size
, view
);
277 // Output_segment_header methods.
279 Output_segment_headers::Output_segment_headers(
280 const Layout::Segment_list
& segment_list
)
281 : segment_list_(segment_list
)
286 Output_segment_headers::do_write(Output_file
* of
)
288 switch (parameters
->size_and_endianness())
290 #ifdef HAVE_TARGET_32_LITTLE
291 case Parameters::TARGET_32_LITTLE
:
292 this->do_sized_write
<32, false>(of
);
295 #ifdef HAVE_TARGET_32_BIG
296 case Parameters::TARGET_32_BIG
:
297 this->do_sized_write
<32, true>(of
);
300 #ifdef HAVE_TARGET_64_LITTLE
301 case Parameters::TARGET_64_LITTLE
:
302 this->do_sized_write
<64, false>(of
);
305 #ifdef HAVE_TARGET_64_BIG
306 case Parameters::TARGET_64_BIG
:
307 this->do_sized_write
<64, true>(of
);
315 template<int size
, bool big_endian
>
317 Output_segment_headers::do_sized_write(Output_file
* of
)
319 const int phdr_size
= elfcpp::Elf_sizes
<size
>::phdr_size
;
320 off_t all_phdrs_size
= this->segment_list_
.size() * phdr_size
;
321 gold_assert(all_phdrs_size
== this->data_size());
322 unsigned char* view
= of
->get_output_view(this->offset(),
324 unsigned char* v
= view
;
325 for (Layout::Segment_list::const_iterator p
= this->segment_list_
.begin();
326 p
!= this->segment_list_
.end();
329 elfcpp::Phdr_write
<size
, big_endian
> ophdr(v
);
330 (*p
)->write_header(&ophdr
);
334 gold_assert(v
- view
== all_phdrs_size
);
336 of
->write_output_view(this->offset(), all_phdrs_size
, view
);
340 Output_segment_headers::do_size() const
342 const int size
= parameters
->target().get_size();
345 phdr_size
= elfcpp::Elf_sizes
<32>::phdr_size
;
347 phdr_size
= elfcpp::Elf_sizes
<64>::phdr_size
;
351 return this->segment_list_
.size() * phdr_size
;
354 // Output_file_header methods.
356 Output_file_header::Output_file_header(const Target
* target
,
357 const Symbol_table
* symtab
,
358 const Output_segment_headers
* osh
,
362 segment_header_(osh
),
363 section_header_(NULL
),
367 this->set_data_size(this->do_size());
370 // Set the section table information for a file header.
373 Output_file_header::set_section_info(const Output_section_headers
* shdrs
,
374 const Output_section
* shstrtab
)
376 this->section_header_
= shdrs
;
377 this->shstrtab_
= shstrtab
;
380 // Write out the file header.
383 Output_file_header::do_write(Output_file
* of
)
385 gold_assert(this->offset() == 0);
387 switch (parameters
->size_and_endianness())
389 #ifdef HAVE_TARGET_32_LITTLE
390 case Parameters::TARGET_32_LITTLE
:
391 this->do_sized_write
<32, false>(of
);
394 #ifdef HAVE_TARGET_32_BIG
395 case Parameters::TARGET_32_BIG
:
396 this->do_sized_write
<32, true>(of
);
399 #ifdef HAVE_TARGET_64_LITTLE
400 case Parameters::TARGET_64_LITTLE
:
401 this->do_sized_write
<64, false>(of
);
404 #ifdef HAVE_TARGET_64_BIG
405 case Parameters::TARGET_64_BIG
:
406 this->do_sized_write
<64, true>(of
);
414 // Write out the file header with appropriate size and endianess.
416 template<int size
, bool big_endian
>
418 Output_file_header::do_sized_write(Output_file
* of
)
420 gold_assert(this->offset() == 0);
422 int ehdr_size
= elfcpp::Elf_sizes
<size
>::ehdr_size
;
423 unsigned char* view
= of
->get_output_view(0, ehdr_size
);
424 elfcpp::Ehdr_write
<size
, big_endian
> oehdr(view
);
426 unsigned char e_ident
[elfcpp::EI_NIDENT
];
427 memset(e_ident
, 0, elfcpp::EI_NIDENT
);
428 e_ident
[elfcpp::EI_MAG0
] = elfcpp::ELFMAG0
;
429 e_ident
[elfcpp::EI_MAG1
] = elfcpp::ELFMAG1
;
430 e_ident
[elfcpp::EI_MAG2
] = elfcpp::ELFMAG2
;
431 e_ident
[elfcpp::EI_MAG3
] = elfcpp::ELFMAG3
;
433 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS32
;
435 e_ident
[elfcpp::EI_CLASS
] = elfcpp::ELFCLASS64
;
438 e_ident
[elfcpp::EI_DATA
] = (big_endian
439 ? elfcpp::ELFDATA2MSB
440 : elfcpp::ELFDATA2LSB
);
441 e_ident
[elfcpp::EI_VERSION
] = elfcpp::EV_CURRENT
;
442 oehdr
.put_e_ident(e_ident
);
445 if (parameters
->options().relocatable())
446 e_type
= elfcpp::ET_REL
;
447 else if (parameters
->options().output_is_position_independent())
448 e_type
= elfcpp::ET_DYN
;
450 e_type
= elfcpp::ET_EXEC
;
451 oehdr
.put_e_type(e_type
);
453 oehdr
.put_e_machine(this->target_
->machine_code());
454 oehdr
.put_e_version(elfcpp::EV_CURRENT
);
456 oehdr
.put_e_entry(this->entry
<size
>());
458 if (this->segment_header_
== NULL
)
459 oehdr
.put_e_phoff(0);
461 oehdr
.put_e_phoff(this->segment_header_
->offset());
463 oehdr
.put_e_shoff(this->section_header_
->offset());
464 oehdr
.put_e_flags(this->target_
->processor_specific_flags());
465 oehdr
.put_e_ehsize(elfcpp::Elf_sizes
<size
>::ehdr_size
);
467 if (this->segment_header_
== NULL
)
469 oehdr
.put_e_phentsize(0);
470 oehdr
.put_e_phnum(0);
474 oehdr
.put_e_phentsize(elfcpp::Elf_sizes
<size
>::phdr_size
);
475 size_t phnum
= (this->segment_header_
->data_size()
476 / elfcpp::Elf_sizes
<size
>::phdr_size
);
477 if (phnum
> elfcpp::PN_XNUM
)
478 phnum
= elfcpp::PN_XNUM
;
479 oehdr
.put_e_phnum(phnum
);
482 oehdr
.put_e_shentsize(elfcpp::Elf_sizes
<size
>::shdr_size
);
483 size_t section_count
= (this->section_header_
->data_size()
484 / elfcpp::Elf_sizes
<size
>::shdr_size
);
486 if (section_count
< elfcpp::SHN_LORESERVE
)
487 oehdr
.put_e_shnum(this->section_header_
->data_size()
488 / elfcpp::Elf_sizes
<size
>::shdr_size
);
490 oehdr
.put_e_shnum(0);
492 unsigned int shstrndx
= this->shstrtab_
->out_shndx();
493 if (shstrndx
< elfcpp::SHN_LORESERVE
)
494 oehdr
.put_e_shstrndx(this->shstrtab_
->out_shndx());
496 oehdr
.put_e_shstrndx(elfcpp::SHN_XINDEX
);
498 // Let the target adjust the ELF header, e.g., to set EI_OSABI in
499 // the e_ident field.
500 parameters
->target().adjust_elf_header(view
, ehdr_size
);
502 of
->write_output_view(0, ehdr_size
, view
);
505 // Return the value to use for the entry address. THIS->ENTRY_ is the
506 // symbol specified on the command line, if any.
509 typename
elfcpp::Elf_types
<size
>::Elf_Addr
510 Output_file_header::entry()
512 const bool should_issue_warning
= (this->entry_
!= NULL
513 && !parameters
->options().relocatable()
514 && !parameters
->options().shared());
516 // FIXME: Need to support target specific entry symbol.
517 const char* entry
= this->entry_
;
521 Symbol
* sym
= this->symtab_
->lookup(entry
);
523 typename Sized_symbol
<size
>::Value_type v
;
526 Sized_symbol
<size
>* ssym
;
527 ssym
= this->symtab_
->get_sized_symbol
<size
>(sym
);
528 if (!ssym
->is_defined() && should_issue_warning
)
529 gold_warning("entry symbol '%s' exists but is not defined", entry
);
534 // We couldn't find the entry symbol. See if we can parse it as
535 // a number. This supports, e.g., -e 0x1000.
537 v
= strtoull(entry
, &endptr
, 0);
540 if (should_issue_warning
)
541 gold_warning("cannot find entry symbol '%s'", entry
);
549 // Compute the current data size.
552 Output_file_header::do_size() const
554 const int size
= parameters
->target().get_size();
556 return elfcpp::Elf_sizes
<32>::ehdr_size
;
558 return elfcpp::Elf_sizes
<64>::ehdr_size
;
563 // Output_data_const methods.
566 Output_data_const::do_write(Output_file
* of
)
568 of
->write(this->offset(), this->data_
.data(), this->data_
.size());
571 // Output_data_const_buffer methods.
574 Output_data_const_buffer::do_write(Output_file
* of
)
576 of
->write(this->offset(), this->p_
, this->data_size());
579 // Output_section_data methods.
581 // Record the output section, and set the entry size and such.
584 Output_section_data::set_output_section(Output_section
* os
)
586 gold_assert(this->output_section_
== NULL
);
587 this->output_section_
= os
;
588 this->do_adjust_output_section(os
);
591 // Return the section index of the output section.
594 Output_section_data::do_out_shndx() const
596 gold_assert(this->output_section_
!= NULL
);
597 return this->output_section_
->out_shndx();
600 // Set the alignment, which means we may need to update the alignment
601 // of the output section.
604 Output_section_data::set_addralign(uint64_t addralign
)
606 this->addralign_
= addralign
;
607 if (this->output_section_
!= NULL
608 && this->output_section_
->addralign() < addralign
)
609 this->output_section_
->set_addralign(addralign
);
612 // Output_data_strtab methods.
614 // Set the final data size.
617 Output_data_strtab::set_final_data_size()
619 this->strtab_
->set_string_offsets();
620 this->set_data_size(this->strtab_
->get_strtab_size());
623 // Write out a string table.
626 Output_data_strtab::do_write(Output_file
* of
)
628 this->strtab_
->write(of
, this->offset());
631 // Output_reloc methods.
633 // A reloc against a global symbol.
635 template<bool dynamic
, int size
, bool big_endian
>
636 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
642 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
643 is_relative_(is_relative
), is_section_symbol_(false), shndx_(INVALID_CODE
)
645 // this->type_ is a bitfield; make sure TYPE fits.
646 gold_assert(this->type_
== type
);
647 this->u1_
.gsym
= gsym
;
650 this->set_needs_dynsym_index();
653 template<bool dynamic
, int size
, bool big_endian
>
654 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
657 Sized_relobj
<size
, big_endian
>* relobj
,
661 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
662 is_relative_(is_relative
), is_section_symbol_(false), shndx_(shndx
)
664 gold_assert(shndx
!= INVALID_CODE
);
665 // this->type_ is a bitfield; make sure TYPE fits.
666 gold_assert(this->type_
== type
);
667 this->u1_
.gsym
= gsym
;
668 this->u2_
.relobj
= relobj
;
670 this->set_needs_dynsym_index();
673 // A reloc against a local symbol.
675 template<bool dynamic
, int size
, bool big_endian
>
676 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
677 Sized_relobj
<size
, big_endian
>* relobj
,
678 unsigned int local_sym_index
,
683 bool is_section_symbol
)
684 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
685 is_relative_(is_relative
), is_section_symbol_(is_section_symbol
),
688 gold_assert(local_sym_index
!= GSYM_CODE
689 && local_sym_index
!= INVALID_CODE
);
690 // this->type_ is a bitfield; make sure TYPE fits.
691 gold_assert(this->type_
== type
);
692 this->u1_
.relobj
= relobj
;
695 this->set_needs_dynsym_index();
698 template<bool dynamic
, int size
, bool big_endian
>
699 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
700 Sized_relobj
<size
, big_endian
>* relobj
,
701 unsigned int local_sym_index
,
706 bool is_section_symbol
)
707 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
708 is_relative_(is_relative
), is_section_symbol_(is_section_symbol
),
711 gold_assert(local_sym_index
!= GSYM_CODE
712 && local_sym_index
!= INVALID_CODE
);
713 gold_assert(shndx
!= INVALID_CODE
);
714 // this->type_ is a bitfield; make sure TYPE fits.
715 gold_assert(this->type_
== type
);
716 this->u1_
.relobj
= relobj
;
717 this->u2_
.relobj
= relobj
;
719 this->set_needs_dynsym_index();
722 // A reloc against the STT_SECTION symbol of an output section.
724 template<bool dynamic
, int size
, bool big_endian
>
725 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
730 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
731 is_relative_(false), is_section_symbol_(true), shndx_(INVALID_CODE
)
733 // this->type_ is a bitfield; make sure TYPE fits.
734 gold_assert(this->type_
== type
);
738 this->set_needs_dynsym_index();
740 os
->set_needs_symtab_index();
743 template<bool dynamic
, int size
, bool big_endian
>
744 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
747 Sized_relobj
<size
, big_endian
>* relobj
,
750 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
751 is_relative_(false), is_section_symbol_(true), shndx_(shndx
)
753 gold_assert(shndx
!= INVALID_CODE
);
754 // this->type_ is a bitfield; make sure TYPE fits.
755 gold_assert(this->type_
== type
);
757 this->u2_
.relobj
= relobj
;
759 this->set_needs_dynsym_index();
761 os
->set_needs_symtab_index();
764 // An absolute relocation.
766 template<bool dynamic
, int size
, bool big_endian
>
767 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
771 : address_(address
), local_sym_index_(0), type_(type
),
772 is_relative_(false), is_section_symbol_(false), shndx_(INVALID_CODE
)
774 // this->type_ is a bitfield; make sure TYPE fits.
775 gold_assert(this->type_
== type
);
776 this->u1_
.relobj
= NULL
;
780 template<bool dynamic
, int size
, bool big_endian
>
781 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
783 Sized_relobj
<size
, big_endian
>* relobj
,
786 : address_(address
), local_sym_index_(0), type_(type
),
787 is_relative_(false), is_section_symbol_(false), shndx_(shndx
)
789 gold_assert(shndx
!= INVALID_CODE
);
790 // this->type_ is a bitfield; make sure TYPE fits.
791 gold_assert(this->type_
== type
);
792 this->u1_
.relobj
= NULL
;
793 this->u2_
.relobj
= relobj
;
796 // A target specific relocation.
798 template<bool dynamic
, int size
, bool big_endian
>
799 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
804 : address_(address
), local_sym_index_(TARGET_CODE
), type_(type
),
805 is_relative_(false), is_section_symbol_(false), shndx_(INVALID_CODE
)
807 // this->type_ is a bitfield; make sure TYPE fits.
808 gold_assert(this->type_
== type
);
813 template<bool dynamic
, int size
, bool big_endian
>
814 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::Output_reloc(
817 Sized_relobj
<size
, big_endian
>* relobj
,
820 : address_(address
), local_sym_index_(TARGET_CODE
), type_(type
),
821 is_relative_(false), is_section_symbol_(false), shndx_(shndx
)
823 gold_assert(shndx
!= INVALID_CODE
);
824 // this->type_ is a bitfield; make sure TYPE fits.
825 gold_assert(this->type_
== type
);
827 this->u2_
.relobj
= relobj
;
830 // Record that we need a dynamic symbol index for this relocation.
832 template<bool dynamic
, int size
, bool big_endian
>
834 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::
835 set_needs_dynsym_index()
837 if (this->is_relative_
)
839 switch (this->local_sym_index_
)
845 this->u1_
.gsym
->set_needs_dynsym_entry();
849 this->u1_
.os
->set_needs_dynsym_index();
853 // The target must take care of this if necessary.
861 const unsigned int lsi
= this->local_sym_index_
;
862 if (!this->is_section_symbol_
)
863 this->u1_
.relobj
->set_needs_output_dynsym_entry(lsi
);
865 this->u1_
.relobj
->output_section(lsi
)->set_needs_dynsym_index();
871 // Get the symbol index of a relocation.
873 template<bool dynamic
, int size
, bool big_endian
>
875 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::get_symbol_index()
879 switch (this->local_sym_index_
)
885 if (this->u1_
.gsym
== NULL
)
888 index
= this->u1_
.gsym
->dynsym_index();
890 index
= this->u1_
.gsym
->symtab_index();
895 index
= this->u1_
.os
->dynsym_index();
897 index
= this->u1_
.os
->symtab_index();
901 index
= parameters
->target().reloc_symbol_index(this->u1_
.arg
,
906 // Relocations without symbols use a symbol index of 0.
912 const unsigned int lsi
= this->local_sym_index_
;
913 if (!this->is_section_symbol_
)
916 index
= this->u1_
.relobj
->dynsym_index(lsi
);
918 index
= this->u1_
.relobj
->symtab_index(lsi
);
922 Output_section
* os
= this->u1_
.relobj
->output_section(lsi
);
923 gold_assert(os
!= NULL
);
925 index
= os
->dynsym_index();
927 index
= os
->symtab_index();
932 gold_assert(index
!= -1U);
936 // For a local section symbol, get the address of the offset ADDEND
937 // within the input section.
939 template<bool dynamic
, int size
, bool big_endian
>
940 typename
elfcpp::Elf_types
<size
>::Elf_Addr
941 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::
942 local_section_offset(Addend addend
) const
944 gold_assert(this->local_sym_index_
!= GSYM_CODE
945 && this->local_sym_index_
!= SECTION_CODE
946 && this->local_sym_index_
!= TARGET_CODE
947 && this->local_sym_index_
!= INVALID_CODE
948 && this->local_sym_index_
!= 0
949 && this->is_section_symbol_
);
950 const unsigned int lsi
= this->local_sym_index_
;
951 Output_section
* os
= this->u1_
.relobj
->output_section(lsi
);
952 gold_assert(os
!= NULL
);
953 Address offset
= this->u1_
.relobj
->get_output_section_offset(lsi
);
954 if (offset
!= invalid_address
)
955 return offset
+ addend
;
956 // This is a merge section.
957 offset
= os
->output_address(this->u1_
.relobj
, lsi
, addend
);
958 gold_assert(offset
!= invalid_address
);
962 // Get the output address of a relocation.
964 template<bool dynamic
, int size
, bool big_endian
>
965 typename
elfcpp::Elf_types
<size
>::Elf_Addr
966 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::get_address() const
968 Address address
= this->address_
;
969 if (this->shndx_
!= INVALID_CODE
)
971 Output_section
* os
= this->u2_
.relobj
->output_section(this->shndx_
);
972 gold_assert(os
!= NULL
);
973 Address off
= this->u2_
.relobj
->get_output_section_offset(this->shndx_
);
974 if (off
!= invalid_address
)
975 address
+= os
->address() + off
;
978 address
= os
->output_address(this->u2_
.relobj
, this->shndx_
,
980 gold_assert(address
!= invalid_address
);
983 else if (this->u2_
.od
!= NULL
)
984 address
+= this->u2_
.od
->address();
988 // Write out the offset and info fields of a Rel or Rela relocation
991 template<bool dynamic
, int size
, bool big_endian
>
992 template<typename Write_rel
>
994 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write_rel(
997 wr
->put_r_offset(this->get_address());
998 unsigned int sym_index
= this->is_relative_
? 0 : this->get_symbol_index();
999 wr
->put_r_info(elfcpp::elf_r_info
<size
>(sym_index
, this->type_
));
1002 // Write out a Rel relocation.
1004 template<bool dynamic
, int size
, bool big_endian
>
1006 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::write(
1007 unsigned char* pov
) const
1009 elfcpp::Rel_write
<size
, big_endian
> orel(pov
);
1010 this->write_rel(&orel
);
1013 // Get the value of the symbol referred to by a Rel relocation.
1015 template<bool dynamic
, int size
, bool big_endian
>
1016 typename
elfcpp::Elf_types
<size
>::Elf_Addr
1017 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::symbol_value(
1018 Addend addend
) const
1020 if (this->local_sym_index_
== GSYM_CODE
)
1022 const Sized_symbol
<size
>* sym
;
1023 sym
= static_cast<const Sized_symbol
<size
>*>(this->u1_
.gsym
);
1024 return sym
->value() + addend
;
1026 gold_assert(this->local_sym_index_
!= SECTION_CODE
1027 && this->local_sym_index_
!= TARGET_CODE
1028 && this->local_sym_index_
!= INVALID_CODE
1029 && this->local_sym_index_
!= 0
1030 && !this->is_section_symbol_
);
1031 const unsigned int lsi
= this->local_sym_index_
;
1032 const Symbol_value
<size
>* symval
= this->u1_
.relobj
->local_symbol(lsi
);
1033 return symval
->value(this->u1_
.relobj
, addend
);
1036 // Reloc comparison. This function sorts the dynamic relocs for the
1037 // benefit of the dynamic linker. First we sort all relative relocs
1038 // to the front. Among relative relocs, we sort by output address.
1039 // Among non-relative relocs, we sort by symbol index, then by output
1042 template<bool dynamic
, int size
, bool big_endian
>
1044 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>::
1045 compare(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>& r2
)
1048 if (this->is_relative_
)
1050 if (!r2
.is_relative_
)
1052 // Otherwise sort by reloc address below.
1054 else if (r2
.is_relative_
)
1058 unsigned int sym1
= this->get_symbol_index();
1059 unsigned int sym2
= r2
.get_symbol_index();
1062 else if (sym1
> sym2
)
1064 // Otherwise sort by reloc address.
1067 section_offset_type addr1
= this->get_address();
1068 section_offset_type addr2
= r2
.get_address();
1071 else if (addr1
> addr2
)
1074 // Final tie breaker, in order to generate the same output on any
1075 // host: reloc type.
1076 unsigned int type1
= this->type_
;
1077 unsigned int type2
= r2
.type_
;
1080 else if (type1
> type2
)
1083 // These relocs appear to be exactly the same.
1087 // Write out a Rela relocation.
1089 template<bool dynamic
, int size
, bool big_endian
>
1091 Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>::write(
1092 unsigned char* pov
) const
1094 elfcpp::Rela_write
<size
, big_endian
> orel(pov
);
1095 this->rel_
.write_rel(&orel
);
1096 Addend addend
= this->addend_
;
1097 if (this->rel_
.is_target_specific())
1098 addend
= parameters
->target().reloc_addend(this->rel_
.target_arg(),
1099 this->rel_
.type(), addend
);
1100 else if (this->rel_
.is_relative())
1101 addend
= this->rel_
.symbol_value(addend
);
1102 else if (this->rel_
.is_local_section_symbol())
1103 addend
= this->rel_
.local_section_offset(addend
);
1104 orel
.put_r_addend(addend
);
1107 // Output_data_reloc_base methods.
1109 // Adjust the output section.
1111 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1113 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>
1114 ::do_adjust_output_section(Output_section
* os
)
1116 if (sh_type
== elfcpp::SHT_REL
)
1117 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
1118 else if (sh_type
== elfcpp::SHT_RELA
)
1119 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
1123 os
->set_should_link_to_dynsym();
1125 os
->set_should_link_to_symtab();
1128 // Write out relocation data.
1130 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1132 Output_data_reloc_base
<sh_type
, dynamic
, size
, big_endian
>::do_write(
1135 const off_t off
= this->offset();
1136 const off_t oview_size
= this->data_size();
1137 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1139 if (this->sort_relocs())
1141 gold_assert(dynamic
);
1142 std::sort(this->relocs_
.begin(), this->relocs_
.end(),
1143 Sort_relocs_comparison());
1146 unsigned char* pov
= oview
;
1147 for (typename
Relocs::const_iterator p
= this->relocs_
.begin();
1148 p
!= this->relocs_
.end();
1155 gold_assert(pov
- oview
== oview_size
);
1157 of
->write_output_view(off
, oview_size
, oview
);
1159 // We no longer need the relocation entries.
1160 this->relocs_
.clear();
1163 // Class Output_relocatable_relocs.
1165 template<int sh_type
, int size
, bool big_endian
>
1167 Output_relocatable_relocs
<sh_type
, size
, big_endian
>::set_final_data_size()
1169 this->set_data_size(this->rr_
->output_reloc_count()
1170 * Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
);
1173 // class Output_data_group.
1175 template<int size
, bool big_endian
>
1176 Output_data_group
<size
, big_endian
>::Output_data_group(
1177 Sized_relobj
<size
, big_endian
>* relobj
,
1178 section_size_type entry_count
,
1179 elfcpp::Elf_Word flags
,
1180 std::vector
<unsigned int>* input_shndxes
)
1181 : Output_section_data(entry_count
* 4, 4, false),
1185 this->input_shndxes_
.swap(*input_shndxes
);
1188 // Write out the section group, which means translating the section
1189 // indexes to apply to the output file.
1191 template<int size
, bool big_endian
>
1193 Output_data_group
<size
, big_endian
>::do_write(Output_file
* of
)
1195 const off_t off
= this->offset();
1196 const section_size_type oview_size
=
1197 convert_to_section_size_type(this->data_size());
1198 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1200 elfcpp::Elf_Word
* contents
= reinterpret_cast<elfcpp::Elf_Word
*>(oview
);
1201 elfcpp::Swap
<32, big_endian
>::writeval(contents
, this->flags_
);
1204 for (std::vector
<unsigned int>::const_iterator p
=
1205 this->input_shndxes_
.begin();
1206 p
!= this->input_shndxes_
.end();
1209 Output_section
* os
= this->relobj_
->output_section(*p
);
1211 unsigned int output_shndx
;
1213 output_shndx
= os
->out_shndx();
1216 this->relobj_
->error(_("section group retained but "
1217 "group element discarded"));
1221 elfcpp::Swap
<32, big_endian
>::writeval(contents
, output_shndx
);
1224 size_t wrote
= reinterpret_cast<unsigned char*>(contents
) - oview
;
1225 gold_assert(wrote
== oview_size
);
1227 of
->write_output_view(off
, oview_size
, oview
);
1229 // We no longer need this information.
1230 this->input_shndxes_
.clear();
1233 // Output_data_got::Got_entry methods.
1235 // Write out the entry.
1237 template<int size
, bool big_endian
>
1239 Output_data_got
<size
, big_endian
>::Got_entry::write(unsigned char* pov
) const
1243 switch (this->local_sym_index_
)
1247 // If the symbol is resolved locally, we need to write out the
1248 // link-time value, which will be relocated dynamically by a
1249 // RELATIVE relocation.
1250 Symbol
* gsym
= this->u_
.gsym
;
1251 Sized_symbol
<size
>* sgsym
;
1252 // This cast is a bit ugly. We don't want to put a
1253 // virtual method in Symbol, because we want Symbol to be
1254 // as small as possible.
1255 sgsym
= static_cast<Sized_symbol
<size
>*>(gsym
);
1256 val
= sgsym
->value();
1261 val
= this->u_
.constant
;
1266 const unsigned int lsi
= this->local_sym_index_
;
1267 const Symbol_value
<size
>* symval
= this->u_
.object
->local_symbol(lsi
);
1268 val
= symval
->value(this->u_
.object
, 0);
1273 elfcpp::Swap
<size
, big_endian
>::writeval(pov
, val
);
1276 // Output_data_got methods.
1278 // Add an entry for a global symbol to the GOT. This returns true if
1279 // this is a new GOT entry, false if the symbol already had a GOT
1282 template<int size
, bool big_endian
>
1284 Output_data_got
<size
, big_endian
>::add_global(
1286 unsigned int got_type
)
1288 if (gsym
->has_got_offset(got_type
))
1291 this->entries_
.push_back(Got_entry(gsym
));
1292 this->set_got_size();
1293 gsym
->set_got_offset(got_type
, this->last_got_offset());
1297 // Add an entry for a global symbol to the GOT, and add a dynamic
1298 // relocation of type R_TYPE for the GOT entry.
1299 template<int size
, bool big_endian
>
1301 Output_data_got
<size
, big_endian
>::add_global_with_rel(
1303 unsigned int got_type
,
1305 unsigned int r_type
)
1307 if (gsym
->has_got_offset(got_type
))
1310 this->entries_
.push_back(Got_entry());
1311 this->set_got_size();
1312 unsigned int got_offset
= this->last_got_offset();
1313 gsym
->set_got_offset(got_type
, got_offset
);
1314 rel_dyn
->add_global(gsym
, r_type
, this, got_offset
);
1317 template<int size
, bool big_endian
>
1319 Output_data_got
<size
, big_endian
>::add_global_with_rela(
1321 unsigned int got_type
,
1323 unsigned int r_type
)
1325 if (gsym
->has_got_offset(got_type
))
1328 this->entries_
.push_back(Got_entry());
1329 this->set_got_size();
1330 unsigned int got_offset
= this->last_got_offset();
1331 gsym
->set_got_offset(got_type
, got_offset
);
1332 rela_dyn
->add_global(gsym
, r_type
, this, got_offset
, 0);
1335 // Add a pair of entries for a global symbol to the GOT, and add
1336 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1337 // If R_TYPE_2 == 0, add the second entry with no relocation.
1338 template<int size
, bool big_endian
>
1340 Output_data_got
<size
, big_endian
>::add_global_pair_with_rel(
1342 unsigned int got_type
,
1344 unsigned int r_type_1
,
1345 unsigned int r_type_2
)
1347 if (gsym
->has_got_offset(got_type
))
1350 this->entries_
.push_back(Got_entry());
1351 unsigned int got_offset
= this->last_got_offset();
1352 gsym
->set_got_offset(got_type
, got_offset
);
1353 rel_dyn
->add_global(gsym
, r_type_1
, this, got_offset
);
1355 this->entries_
.push_back(Got_entry());
1358 got_offset
= this->last_got_offset();
1359 rel_dyn
->add_global(gsym
, r_type_2
, this, got_offset
);
1362 this->set_got_size();
1365 template<int size
, bool big_endian
>
1367 Output_data_got
<size
, big_endian
>::add_global_pair_with_rela(
1369 unsigned int got_type
,
1371 unsigned int r_type_1
,
1372 unsigned int r_type_2
)
1374 if (gsym
->has_got_offset(got_type
))
1377 this->entries_
.push_back(Got_entry());
1378 unsigned int got_offset
= this->last_got_offset();
1379 gsym
->set_got_offset(got_type
, got_offset
);
1380 rela_dyn
->add_global(gsym
, r_type_1
, this, got_offset
, 0);
1382 this->entries_
.push_back(Got_entry());
1385 got_offset
= this->last_got_offset();
1386 rela_dyn
->add_global(gsym
, r_type_2
, this, got_offset
, 0);
1389 this->set_got_size();
1392 // Add an entry for a local symbol to the GOT. This returns true if
1393 // this is a new GOT entry, false if the symbol already has a GOT
1396 template<int size
, bool big_endian
>
1398 Output_data_got
<size
, big_endian
>::add_local(
1399 Sized_relobj
<size
, big_endian
>* object
,
1400 unsigned int symndx
,
1401 unsigned int got_type
)
1403 if (object
->local_has_got_offset(symndx
, got_type
))
1406 this->entries_
.push_back(Got_entry(object
, symndx
));
1407 this->set_got_size();
1408 object
->set_local_got_offset(symndx
, got_type
, this->last_got_offset());
1412 // Add an entry for a local symbol to the GOT, and add a dynamic
1413 // relocation of type R_TYPE for the GOT entry.
1414 template<int size
, bool big_endian
>
1416 Output_data_got
<size
, big_endian
>::add_local_with_rel(
1417 Sized_relobj
<size
, big_endian
>* object
,
1418 unsigned int symndx
,
1419 unsigned int got_type
,
1421 unsigned int r_type
)
1423 if (object
->local_has_got_offset(symndx
, got_type
))
1426 this->entries_
.push_back(Got_entry());
1427 this->set_got_size();
1428 unsigned int got_offset
= this->last_got_offset();
1429 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1430 rel_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
);
1433 template<int size
, bool big_endian
>
1435 Output_data_got
<size
, big_endian
>::add_local_with_rela(
1436 Sized_relobj
<size
, big_endian
>* object
,
1437 unsigned int symndx
,
1438 unsigned int got_type
,
1440 unsigned int r_type
)
1442 if (object
->local_has_got_offset(symndx
, got_type
))
1445 this->entries_
.push_back(Got_entry());
1446 this->set_got_size();
1447 unsigned int got_offset
= this->last_got_offset();
1448 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1449 rela_dyn
->add_local(object
, symndx
, r_type
, this, got_offset
, 0);
1452 // Add a pair of entries for a local symbol to the GOT, and add
1453 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1454 // If R_TYPE_2 == 0, add the second entry with no relocation.
1455 template<int size
, bool big_endian
>
1457 Output_data_got
<size
, big_endian
>::add_local_pair_with_rel(
1458 Sized_relobj
<size
, big_endian
>* object
,
1459 unsigned int symndx
,
1461 unsigned int got_type
,
1463 unsigned int r_type_1
,
1464 unsigned int r_type_2
)
1466 if (object
->local_has_got_offset(symndx
, got_type
))
1469 this->entries_
.push_back(Got_entry());
1470 unsigned int got_offset
= this->last_got_offset();
1471 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1472 Output_section
* os
= object
->output_section(shndx
);
1473 rel_dyn
->add_output_section(os
, r_type_1
, this, got_offset
);
1475 this->entries_
.push_back(Got_entry(object
, symndx
));
1478 got_offset
= this->last_got_offset();
1479 rel_dyn
->add_output_section(os
, r_type_2
, this, got_offset
);
1482 this->set_got_size();
1485 template<int size
, bool big_endian
>
1487 Output_data_got
<size
, big_endian
>::add_local_pair_with_rela(
1488 Sized_relobj
<size
, big_endian
>* object
,
1489 unsigned int symndx
,
1491 unsigned int got_type
,
1493 unsigned int r_type_1
,
1494 unsigned int r_type_2
)
1496 if (object
->local_has_got_offset(symndx
, got_type
))
1499 this->entries_
.push_back(Got_entry());
1500 unsigned int got_offset
= this->last_got_offset();
1501 object
->set_local_got_offset(symndx
, got_type
, got_offset
);
1502 Output_section
* os
= object
->output_section(shndx
);
1503 rela_dyn
->add_output_section(os
, r_type_1
, this, got_offset
, 0);
1505 this->entries_
.push_back(Got_entry(object
, symndx
));
1508 got_offset
= this->last_got_offset();
1509 rela_dyn
->add_output_section(os
, r_type_2
, this, got_offset
, 0);
1512 this->set_got_size();
1515 // Write out the GOT.
1517 template<int size
, bool big_endian
>
1519 Output_data_got
<size
, big_endian
>::do_write(Output_file
* of
)
1521 const int add
= size
/ 8;
1523 const off_t off
= this->offset();
1524 const off_t oview_size
= this->data_size();
1525 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1527 unsigned char* pov
= oview
;
1528 for (typename
Got_entries::const_iterator p
= this->entries_
.begin();
1529 p
!= this->entries_
.end();
1536 gold_assert(pov
- oview
== oview_size
);
1538 of
->write_output_view(off
, oview_size
, oview
);
1540 // We no longer need the GOT entries.
1541 this->entries_
.clear();
1544 // Output_data_dynamic::Dynamic_entry methods.
1546 // Write out the entry.
1548 template<int size
, bool big_endian
>
1550 Output_data_dynamic::Dynamic_entry::write(
1552 const Stringpool
* pool
) const
1554 typename
elfcpp::Elf_types
<size
>::Elf_WXword val
;
1555 switch (this->offset_
)
1557 case DYNAMIC_NUMBER
:
1561 case DYNAMIC_SECTION_SIZE
:
1562 val
= this->u_
.od
->data_size();
1565 case DYNAMIC_SYMBOL
:
1567 const Sized_symbol
<size
>* s
=
1568 static_cast<const Sized_symbol
<size
>*>(this->u_
.sym
);
1573 case DYNAMIC_STRING
:
1574 val
= pool
->get_offset(this->u_
.str
);
1578 val
= this->u_
.od
->address() + this->offset_
;
1582 elfcpp::Dyn_write
<size
, big_endian
> dw(pov
);
1583 dw
.put_d_tag(this->tag_
);
1587 // Output_data_dynamic methods.
1589 // Adjust the output section to set the entry size.
1592 Output_data_dynamic::do_adjust_output_section(Output_section
* os
)
1594 if (parameters
->target().get_size() == 32)
1595 os
->set_entsize(elfcpp::Elf_sizes
<32>::dyn_size
);
1596 else if (parameters
->target().get_size() == 64)
1597 os
->set_entsize(elfcpp::Elf_sizes
<64>::dyn_size
);
1602 // Set the final data size.
1605 Output_data_dynamic::set_final_data_size()
1607 // Add the terminating entry if it hasn't been added.
1608 // Because of relaxation, we can run this multiple times.
1609 if (this->entries_
.empty()
1610 || this->entries_
.rbegin()->tag() != elfcpp::DT_NULL
)
1611 this->add_constant(elfcpp::DT_NULL
, 0);
1614 if (parameters
->target().get_size() == 32)
1615 dyn_size
= elfcpp::Elf_sizes
<32>::dyn_size
;
1616 else if (parameters
->target().get_size() == 64)
1617 dyn_size
= elfcpp::Elf_sizes
<64>::dyn_size
;
1620 this->set_data_size(this->entries_
.size() * dyn_size
);
1623 // Write out the dynamic entries.
1626 Output_data_dynamic::do_write(Output_file
* of
)
1628 switch (parameters
->size_and_endianness())
1630 #ifdef HAVE_TARGET_32_LITTLE
1631 case Parameters::TARGET_32_LITTLE
:
1632 this->sized_write
<32, false>(of
);
1635 #ifdef HAVE_TARGET_32_BIG
1636 case Parameters::TARGET_32_BIG
:
1637 this->sized_write
<32, true>(of
);
1640 #ifdef HAVE_TARGET_64_LITTLE
1641 case Parameters::TARGET_64_LITTLE
:
1642 this->sized_write
<64, false>(of
);
1645 #ifdef HAVE_TARGET_64_BIG
1646 case Parameters::TARGET_64_BIG
:
1647 this->sized_write
<64, true>(of
);
1655 template<int size
, bool big_endian
>
1657 Output_data_dynamic::sized_write(Output_file
* of
)
1659 const int dyn_size
= elfcpp::Elf_sizes
<size
>::dyn_size
;
1661 const off_t offset
= this->offset();
1662 const off_t oview_size
= this->data_size();
1663 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1665 unsigned char* pov
= oview
;
1666 for (typename
Dynamic_entries::const_iterator p
= this->entries_
.begin();
1667 p
!= this->entries_
.end();
1670 p
->write
<size
, big_endian
>(pov
, this->pool_
);
1674 gold_assert(pov
- oview
== oview_size
);
1676 of
->write_output_view(offset
, oview_size
, oview
);
1678 // We no longer need the dynamic entries.
1679 this->entries_
.clear();
1682 // Class Output_symtab_xindex.
1685 Output_symtab_xindex::do_write(Output_file
* of
)
1687 const off_t offset
= this->offset();
1688 const off_t oview_size
= this->data_size();
1689 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1691 memset(oview
, 0, oview_size
);
1693 if (parameters
->target().is_big_endian())
1694 this->endian_do_write
<true>(oview
);
1696 this->endian_do_write
<false>(oview
);
1698 of
->write_output_view(offset
, oview_size
, oview
);
1700 // We no longer need the data.
1701 this->entries_
.clear();
1704 template<bool big_endian
>
1706 Output_symtab_xindex::endian_do_write(unsigned char* const oview
)
1708 for (Xindex_entries::const_iterator p
= this->entries_
.begin();
1709 p
!= this->entries_
.end();
1712 unsigned int symndx
= p
->first
;
1713 gold_assert(symndx
* 4 < this->data_size());
1714 elfcpp::Swap
<32, big_endian
>::writeval(oview
+ symndx
* 4, p
->second
);
1718 // Output_section::Input_section methods.
1720 // Return the data size. For an input section we store the size here.
1721 // For an Output_section_data, we have to ask it for the size.
1724 Output_section::Input_section::data_size() const
1726 if (this->is_input_section())
1727 return this->u1_
.data_size
;
1729 return this->u2_
.posd
->data_size();
1732 // Set the address and file offset.
1735 Output_section::Input_section::set_address_and_file_offset(
1738 off_t section_file_offset
)
1740 if (this->is_input_section())
1741 this->u2_
.object
->set_section_offset(this->shndx_
,
1742 file_offset
- section_file_offset
);
1744 this->u2_
.posd
->set_address_and_file_offset(address
, file_offset
);
1747 // Reset the address and file offset.
1750 Output_section::Input_section::reset_address_and_file_offset()
1752 if (!this->is_input_section())
1753 this->u2_
.posd
->reset_address_and_file_offset();
1756 // Finalize the data size.
1759 Output_section::Input_section::finalize_data_size()
1761 if (!this->is_input_section())
1762 this->u2_
.posd
->finalize_data_size();
1765 // Try to turn an input offset into an output offset. We want to
1766 // return the output offset relative to the start of this
1767 // Input_section in the output section.
1770 Output_section::Input_section::output_offset(
1771 const Relobj
* object
,
1773 section_offset_type offset
,
1774 section_offset_type
*poutput
) const
1776 if (!this->is_input_section())
1777 return this->u2_
.posd
->output_offset(object
, shndx
, offset
, poutput
);
1780 if (this->shndx_
!= shndx
|| this->u2_
.object
!= object
)
1787 // Return whether this is the merge section for the input section
1791 Output_section::Input_section::is_merge_section_for(const Relobj
* object
,
1792 unsigned int shndx
) const
1794 if (this->is_input_section())
1796 return this->u2_
.posd
->is_merge_section_for(object
, shndx
);
1799 // Write out the data. We don't have to do anything for an input
1800 // section--they are handled via Object::relocate--but this is where
1801 // we write out the data for an Output_section_data.
1804 Output_section::Input_section::write(Output_file
* of
)
1806 if (!this->is_input_section())
1807 this->u2_
.posd
->write(of
);
1810 // Write the data to a buffer. As for write(), we don't have to do
1811 // anything for an input section.
1814 Output_section::Input_section::write_to_buffer(unsigned char* buffer
)
1816 if (!this->is_input_section())
1817 this->u2_
.posd
->write_to_buffer(buffer
);
1820 // Print to a map file.
1823 Output_section::Input_section::print_to_mapfile(Mapfile
* mapfile
) const
1825 switch (this->shndx_
)
1827 case OUTPUT_SECTION_CODE
:
1828 case MERGE_DATA_SECTION_CODE
:
1829 case MERGE_STRING_SECTION_CODE
:
1830 this->u2_
.posd
->print_to_mapfile(mapfile
);
1833 case RELAXED_INPUT_SECTION_CODE
:
1835 Output_relaxed_input_section
* relaxed_section
=
1836 this->relaxed_input_section();
1837 mapfile
->print_input_section(relaxed_section
->relobj(),
1838 relaxed_section
->shndx());
1842 mapfile
->print_input_section(this->u2_
.object
, this->shndx_
);
1847 // Output_section methods.
1849 // Construct an Output_section. NAME will point into a Stringpool.
1851 Output_section::Output_section(const char* name
, elfcpp::Elf_Word type
,
1852 elfcpp::Elf_Xword flags
)
1857 link_section_(NULL
),
1859 info_section_(NULL
),
1868 first_input_offset_(0),
1870 postprocessing_buffer_(NULL
),
1871 needs_symtab_index_(false),
1872 needs_dynsym_index_(false),
1873 should_link_to_symtab_(false),
1874 should_link_to_dynsym_(false),
1875 after_input_sections_(false),
1876 requires_postprocessing_(false),
1877 found_in_sections_clause_(false),
1878 has_load_address_(false),
1879 info_uses_section_index_(false),
1880 may_sort_attached_input_sections_(false),
1881 must_sort_attached_input_sections_(false),
1882 attached_input_sections_are_sorted_(false),
1884 is_relro_local_(false),
1885 is_last_relro_(false),
1886 is_first_non_relro_(false),
1887 is_small_section_(false),
1888 is_large_section_(false),
1890 is_dynamic_linker_section_(false),
1891 generate_code_fills_at_write_(false),
1892 is_entsize_zero_(false),
1893 section_offsets_need_adjustment_(false),
1896 merge_section_map_(),
1897 merge_section_by_properties_map_(),
1898 relaxed_input_section_map_(),
1899 is_relaxed_input_section_map_valid_(true)
1901 // An unallocated section has no address. Forcing this means that
1902 // we don't need special treatment for symbols defined in debug
1904 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
1905 this->set_address(0);
1908 Output_section::~Output_section()
1910 delete this->checkpoint_
;
1913 // Set the entry size.
1916 Output_section::set_entsize(uint64_t v
)
1918 if (this->is_entsize_zero_
)
1920 else if (this->entsize_
== 0)
1922 else if (this->entsize_
!= v
)
1925 this->is_entsize_zero_
= 1;
1929 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1930 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1931 // relocation section which applies to this section, or 0 if none, or
1932 // -1U if more than one. Return the offset of the input section
1933 // within the output section. Return -1 if the input section will
1934 // receive special handling. In the normal case we don't always keep
1935 // track of input sections for an Output_section. Instead, each
1936 // Object keeps track of the Output_section for each of its input
1937 // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep
1938 // track of input sections here; this is used when SECTIONS appears in
1941 template<int size
, bool big_endian
>
1943 Output_section::add_input_section(Sized_relobj
<size
, big_endian
>* object
,
1945 const char* secname
,
1946 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1947 unsigned int reloc_shndx
,
1948 bool have_sections_script
)
1950 elfcpp::Elf_Xword addralign
= shdr
.get_sh_addralign();
1951 if ((addralign
& (addralign
- 1)) != 0)
1953 object
->error(_("invalid alignment %lu for section \"%s\""),
1954 static_cast<unsigned long>(addralign
), secname
);
1958 if (addralign
> this->addralign_
)
1959 this->addralign_
= addralign
;
1961 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_flags
= shdr
.get_sh_flags();
1962 uint64_t entsize
= shdr
.get_sh_entsize();
1964 // .debug_str is a mergeable string section, but is not always so
1965 // marked by compilers. Mark manually here so we can optimize.
1966 if (strcmp(secname
, ".debug_str") == 0)
1968 sh_flags
|= (elfcpp::SHF_MERGE
| elfcpp::SHF_STRINGS
);
1972 this->update_flags_for_input_section(sh_flags
);
1973 this->set_entsize(entsize
);
1975 // If this is a SHF_MERGE section, we pass all the input sections to
1976 // a Output_data_merge. We don't try to handle relocations for such
1977 // a section. We don't try to handle empty merge sections--they
1978 // mess up the mappings, and are useless anyhow.
1979 if ((sh_flags
& elfcpp::SHF_MERGE
) != 0
1981 && shdr
.get_sh_size() > 0)
1983 if (this->add_merge_input_section(object
, shndx
, sh_flags
,
1984 entsize
, addralign
))
1986 // Tell the relocation routines that they need to call the
1987 // output_offset method to determine the final address.
1992 off_t offset_in_section
= this->current_data_size_for_child();
1993 off_t aligned_offset_in_section
= align_address(offset_in_section
,
1996 // Determine if we want to delay code-fill generation until the output
1997 // section is written. When the target is relaxing, we want to delay fill
1998 // generating to avoid adjusting them during relaxation.
1999 if (!this->generate_code_fills_at_write_
2000 && !have_sections_script
2001 && (sh_flags
& elfcpp::SHF_EXECINSTR
) != 0
2002 && parameters
->target().has_code_fill()
2003 && parameters
->target().may_relax())
2005 gold_assert(this->fills_
.empty());
2006 this->generate_code_fills_at_write_
= true;
2009 if (aligned_offset_in_section
> offset_in_section
2010 && !this->generate_code_fills_at_write_
2011 && !have_sections_script
2012 && (sh_flags
& elfcpp::SHF_EXECINSTR
) != 0
2013 && parameters
->target().has_code_fill())
2015 // We need to add some fill data. Using fill_list_ when
2016 // possible is an optimization, since we will often have fill
2017 // sections without input sections.
2018 off_t fill_len
= aligned_offset_in_section
- offset_in_section
;
2019 if (this->input_sections_
.empty())
2020 this->fills_
.push_back(Fill(offset_in_section
, fill_len
));
2023 std::string
fill_data(parameters
->target().code_fill(fill_len
));
2024 Output_data_const
* odc
= new Output_data_const(fill_data
, 1);
2025 this->input_sections_
.push_back(Input_section(odc
));
2029 this->set_current_data_size_for_child(aligned_offset_in_section
2030 + shdr
.get_sh_size());
2032 // We need to keep track of this section if we are already keeping
2033 // track of sections, or if we are relaxing. Also, if this is a
2034 // section which requires sorting, or which may require sorting in
2035 // the future, we keep track of the sections.
2036 if (have_sections_script
2037 || !this->input_sections_
.empty()
2038 || this->may_sort_attached_input_sections()
2039 || this->must_sort_attached_input_sections()
2040 || parameters
->options().user_set_Map()
2041 || parameters
->target().may_relax())
2042 this->input_sections_
.push_back(Input_section(object
, shndx
,
2046 return aligned_offset_in_section
;
2049 // Add arbitrary data to an output section.
2052 Output_section::add_output_section_data(Output_section_data
* posd
)
2054 Input_section
inp(posd
);
2055 this->add_output_section_data(&inp
);
2057 if (posd
->is_data_size_valid())
2059 off_t offset_in_section
= this->current_data_size_for_child();
2060 off_t aligned_offset_in_section
= align_address(offset_in_section
,
2062 this->set_current_data_size_for_child(aligned_offset_in_section
2063 + posd
->data_size());
2067 // Add a relaxed input section.
2070 Output_section::add_relaxed_input_section(Output_relaxed_input_section
* poris
)
2072 Input_section
inp(poris
);
2073 this->add_output_section_data(&inp
);
2074 if (this->is_relaxed_input_section_map_valid_
)
2076 Const_section_id
csid(poris
->relobj(), poris
->shndx());
2077 this->relaxed_input_section_map_
[csid
] = poris
;
2080 // For a relaxed section, we use the current data size. Linker scripts
2081 // get all the input sections, including relaxed one from an output
2082 // section and add them back to them same output section to compute the
2083 // output section size. If we do not account for sizes of relaxed input
2084 // sections, an output section would be incorrectly sized.
2085 off_t offset_in_section
= this->current_data_size_for_child();
2086 off_t aligned_offset_in_section
= align_address(offset_in_section
,
2087 poris
->addralign());
2088 this->set_current_data_size_for_child(aligned_offset_in_section
2089 + poris
->current_data_size());
2092 // Add arbitrary data to an output section by Input_section.
2095 Output_section::add_output_section_data(Input_section
* inp
)
2097 if (this->input_sections_
.empty())
2098 this->first_input_offset_
= this->current_data_size_for_child();
2100 this->input_sections_
.push_back(*inp
);
2102 uint64_t addralign
= inp
->addralign();
2103 if (addralign
> this->addralign_
)
2104 this->addralign_
= addralign
;
2106 inp
->set_output_section(this);
2109 // Add a merge section to an output section.
2112 Output_section::add_output_merge_section(Output_section_data
* posd
,
2113 bool is_string
, uint64_t entsize
)
2115 Input_section
inp(posd
, is_string
, entsize
);
2116 this->add_output_section_data(&inp
);
2119 // Add an input section to a SHF_MERGE section.
2122 Output_section::add_merge_input_section(Relobj
* object
, unsigned int shndx
,
2123 uint64_t flags
, uint64_t entsize
,
2126 bool is_string
= (flags
& elfcpp::SHF_STRINGS
) != 0;
2128 // We only merge strings if the alignment is not more than the
2129 // character size. This could be handled, but it's unusual.
2130 if (is_string
&& addralign
> entsize
)
2133 // We cannot restore merged input section states.
2134 gold_assert(this->checkpoint_
== NULL
);
2136 // Look up merge sections by required properties.
2137 Merge_section_properties
msp(is_string
, entsize
, addralign
);
2138 Merge_section_by_properties_map::const_iterator p
=
2139 this->merge_section_by_properties_map_
.find(msp
);
2140 if (p
!= this->merge_section_by_properties_map_
.end())
2142 Output_merge_base
* merge_section
= p
->second
;
2143 merge_section
->add_input_section(object
, shndx
);
2144 gold_assert(merge_section
->is_string() == is_string
2145 && merge_section
->entsize() == entsize
2146 && merge_section
->addralign() == addralign
);
2148 // Link input section to found merge section.
2149 Const_section_id
csid(object
, shndx
);
2150 this->merge_section_map_
[csid
] = merge_section
;
2154 // We handle the actual constant merging in Output_merge_data or
2155 // Output_merge_string_data.
2156 Output_merge_base
* pomb
;
2158 pomb
= new Output_merge_data(entsize
, addralign
);
2164 pomb
= new Output_merge_string
<char>(addralign
);
2167 pomb
= new Output_merge_string
<uint16_t>(addralign
);
2170 pomb
= new Output_merge_string
<uint32_t>(addralign
);
2177 // Add new merge section to this output section and link merge section
2178 // properties to new merge section in map.
2179 this->add_output_merge_section(pomb
, is_string
, entsize
);
2180 this->merge_section_by_properties_map_
[msp
] = pomb
;
2182 // Add input section to new merge section and link input section to new
2183 // merge section in map.
2184 pomb
->add_input_section(object
, shndx
);
2185 Const_section_id
csid(object
, shndx
);
2186 this->merge_section_map_
[csid
] = pomb
;
2191 // Build a relaxation map to speed up relaxation of existing input sections.
2192 // Look up to the first LIMIT elements in INPUT_SECTIONS.
2195 Output_section::build_relaxation_map(
2196 const Input_section_list
& input_sections
,
2198 Relaxation_map
* relaxation_map
) const
2200 for (size_t i
= 0; i
< limit
; ++i
)
2202 const Input_section
& is(input_sections
[i
]);
2203 if (is
.is_input_section() || is
.is_relaxed_input_section())
2205 Section_id
sid(is
.relobj(), is
.shndx());
2206 (*relaxation_map
)[sid
] = i
;
2211 // Convert regular input sections in INPUT_SECTIONS into relaxed input
2212 // sections in RELAXED_SECTIONS. MAP is a prebuilt map from section id
2213 // indices of INPUT_SECTIONS.
2216 Output_section::convert_input_sections_in_list_to_relaxed_sections(
2217 const std::vector
<Output_relaxed_input_section
*>& relaxed_sections
,
2218 const Relaxation_map
& map
,
2219 Input_section_list
* input_sections
)
2221 for (size_t i
= 0; i
< relaxed_sections
.size(); ++i
)
2223 Output_relaxed_input_section
* poris
= relaxed_sections
[i
];
2224 Section_id
sid(poris
->relobj(), poris
->shndx());
2225 Relaxation_map::const_iterator p
= map
.find(sid
);
2226 gold_assert(p
!= map
.end());
2227 gold_assert((*input_sections
)[p
->second
].is_input_section());
2228 (*input_sections
)[p
->second
] = Input_section(poris
);
2232 // Convert regular input sections into relaxed input sections. RELAXED_SECTIONS
2233 // is a vector of pointers to Output_relaxed_input_section or its derived
2234 // classes. The relaxed sections must correspond to existing input sections.
2237 Output_section::convert_input_sections_to_relaxed_sections(
2238 const std::vector
<Output_relaxed_input_section
*>& relaxed_sections
)
2240 gold_assert(parameters
->target().may_relax());
2242 // We want to make sure that restore_states does not undo the effect of
2243 // this. If there is no checkpoint active, just search the current
2244 // input section list and replace the sections there. If there is
2245 // a checkpoint, also replace the sections there.
2247 // By default, we look at the whole list.
2248 size_t limit
= this->input_sections_
.size();
2250 if (this->checkpoint_
!= NULL
)
2252 // Replace input sections with relaxed input section in the saved
2253 // copy of the input section list.
2254 if (this->checkpoint_
->input_sections_saved())
2257 this->build_relaxation_map(
2258 *(this->checkpoint_
->input_sections()),
2259 this->checkpoint_
->input_sections()->size(),
2261 this->convert_input_sections_in_list_to_relaxed_sections(
2264 this->checkpoint_
->input_sections());
2268 // We have not copied the input section list yet. Instead, just
2269 // look at the portion that would be saved.
2270 limit
= this->checkpoint_
->input_sections_size();
2274 // Convert input sections in input_section_list.
2276 this->build_relaxation_map(this->input_sections_
, limit
, &map
);
2277 this->convert_input_sections_in_list_to_relaxed_sections(
2280 &this->input_sections_
);
2282 // Update fast look-up map.
2283 if (this->is_relaxed_input_section_map_valid_
)
2284 for (size_t i
= 0; i
< relaxed_sections
.size(); ++i
)
2286 Output_relaxed_input_section
* poris
= relaxed_sections
[i
];
2287 Const_section_id
csid(poris
->relobj(), poris
->shndx());
2288 this->relaxed_input_section_map_
[csid
] = poris
;
2292 // Update the output section flags based on input section flags.
2295 Output_section::update_flags_for_input_section(elfcpp::Elf_Xword flags
)
2297 // If we created the section with SHF_ALLOC clear, we set the
2298 // address. If we are now setting the SHF_ALLOC flag, we need to
2300 if ((this->flags_
& elfcpp::SHF_ALLOC
) == 0
2301 && (flags
& elfcpp::SHF_ALLOC
) != 0)
2302 this->mark_address_invalid();
2304 this->flags_
|= (flags
2305 & (elfcpp::SHF_WRITE
2307 | elfcpp::SHF_EXECINSTR
));
2309 if ((flags
& elfcpp::SHF_MERGE
) == 0)
2310 this->flags_
&=~ elfcpp::SHF_MERGE
;
2313 if (this->current_data_size_for_child() == 0)
2314 this->flags_
|= elfcpp::SHF_MERGE
;
2317 if ((flags
& elfcpp::SHF_STRINGS
) == 0)
2318 this->flags_
&=~ elfcpp::SHF_STRINGS
;
2321 if (this->current_data_size_for_child() == 0)
2322 this->flags_
|= elfcpp::SHF_STRINGS
;
2326 // Find the merge section into which an input section with index SHNDX in
2327 // OBJECT has been added. Return NULL if none found.
2329 Output_section_data
*
2330 Output_section::find_merge_section(const Relobj
* object
,
2331 unsigned int shndx
) const
2333 Const_section_id
csid(object
, shndx
);
2334 Output_section_data_by_input_section_map::const_iterator p
=
2335 this->merge_section_map_
.find(csid
);
2336 if (p
!= this->merge_section_map_
.end())
2338 Output_section_data
* posd
= p
->second
;
2339 gold_assert(posd
->is_merge_section_for(object
, shndx
));
2346 // Find an relaxed input section corresponding to an input section
2347 // in OBJECT with index SHNDX.
2349 const Output_relaxed_input_section
*
2350 Output_section::find_relaxed_input_section(const Relobj
* object
,
2351 unsigned int shndx
) const
2353 // Be careful that the map may not be valid due to input section export
2354 // to scripts or a check-point restore.
2355 if (!this->is_relaxed_input_section_map_valid_
)
2357 // Rebuild the map as needed.
2358 this->relaxed_input_section_map_
.clear();
2359 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
2360 p
!= this->input_sections_
.end();
2362 if (p
->is_relaxed_input_section())
2364 Const_section_id
csid(p
->relobj(), p
->shndx());
2365 this->relaxed_input_section_map_
[csid
] =
2366 p
->relaxed_input_section();
2368 this->is_relaxed_input_section_map_valid_
= true;
2371 Const_section_id
csid(object
, shndx
);
2372 Output_relaxed_input_section_by_input_section_map::const_iterator p
=
2373 this->relaxed_input_section_map_
.find(csid
);
2374 if (p
!= this->relaxed_input_section_map_
.end())
2380 // Given an address OFFSET relative to the start of input section
2381 // SHNDX in OBJECT, return whether this address is being included in
2382 // the final link. This should only be called if SHNDX in OBJECT has
2383 // a special mapping.
2386 Output_section::is_input_address_mapped(const Relobj
* object
,
2390 // Look at the Output_section_data_maps first.
2391 const Output_section_data
* posd
= this->find_merge_section(object
, shndx
);
2393 posd
= this->find_relaxed_input_section(object
, shndx
);
2397 section_offset_type output_offset
;
2398 bool found
= posd
->output_offset(object
, shndx
, offset
, &output_offset
);
2400 return output_offset
!= -1;
2403 // Fall back to the slow look-up.
2404 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
2405 p
!= this->input_sections_
.end();
2408 section_offset_type output_offset
;
2409 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
2410 return output_offset
!= -1;
2413 // By default we assume that the address is mapped. This should
2414 // only be called after we have passed all sections to Layout. At
2415 // that point we should know what we are discarding.
2419 // Given an address OFFSET relative to the start of input section
2420 // SHNDX in object OBJECT, return the output offset relative to the
2421 // start of the input section in the output section. This should only
2422 // be called if SHNDX in OBJECT has a special mapping.
2425 Output_section::output_offset(const Relobj
* object
, unsigned int shndx
,
2426 section_offset_type offset
) const
2428 // This can only be called meaningfully when we know the data size
2430 gold_assert(this->is_data_size_valid());
2432 // Look at the Output_section_data_maps first.
2433 const Output_section_data
* posd
= this->find_merge_section(object
, shndx
);
2435 posd
= this->find_relaxed_input_section(object
, shndx
);
2438 section_offset_type output_offset
;
2439 bool found
= posd
->output_offset(object
, shndx
, offset
, &output_offset
);
2441 return output_offset
;
2444 // Fall back to the slow look-up.
2445 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
2446 p
!= this->input_sections_
.end();
2449 section_offset_type output_offset
;
2450 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
2451 return output_offset
;
2456 // Return the output virtual address of OFFSET relative to the start
2457 // of input section SHNDX in object OBJECT.
2460 Output_section::output_address(const Relobj
* object
, unsigned int shndx
,
2463 uint64_t addr
= this->address() + this->first_input_offset_
;
2465 // Look at the Output_section_data_maps first.
2466 const Output_section_data
* posd
= this->find_merge_section(object
, shndx
);
2468 posd
= this->find_relaxed_input_section(object
, shndx
);
2469 if (posd
!= NULL
&& posd
->is_address_valid())
2471 section_offset_type output_offset
;
2472 bool found
= posd
->output_offset(object
, shndx
, offset
, &output_offset
);
2474 return posd
->address() + output_offset
;
2477 // Fall back to the slow look-up.
2478 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
2479 p
!= this->input_sections_
.end();
2482 addr
= align_address(addr
, p
->addralign());
2483 section_offset_type output_offset
;
2484 if (p
->output_offset(object
, shndx
, offset
, &output_offset
))
2486 if (output_offset
== -1)
2488 return addr
+ output_offset
;
2490 addr
+= p
->data_size();
2493 // If we get here, it means that we don't know the mapping for this
2494 // input section. This might happen in principle if
2495 // add_input_section were called before add_output_section_data.
2496 // But it should never actually happen.
2501 // Find the output address of the start of the merged section for
2502 // input section SHNDX in object OBJECT.
2505 Output_section::find_starting_output_address(const Relobj
* object
,
2507 uint64_t* paddr
) const
2509 // FIXME: This becomes a bottle-neck if we have many relaxed sections.
2510 // Looking up the merge section map does not always work as we sometimes
2511 // find a merge section without its address set.
2512 uint64_t addr
= this->address() + this->first_input_offset_
;
2513 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
2514 p
!= this->input_sections_
.end();
2517 addr
= align_address(addr
, p
->addralign());
2519 // It would be nice if we could use the existing output_offset
2520 // method to get the output offset of input offset 0.
2521 // Unfortunately we don't know for sure that input offset 0 is
2523 if (p
->is_merge_section_for(object
, shndx
))
2529 addr
+= p
->data_size();
2532 // We couldn't find a merge output section for this input section.
2536 // Set the data size of an Output_section. This is where we handle
2537 // setting the addresses of any Output_section_data objects.
2540 Output_section::set_final_data_size()
2542 if (this->input_sections_
.empty())
2544 this->set_data_size(this->current_data_size_for_child());
2548 if (this->must_sort_attached_input_sections())
2549 this->sort_attached_input_sections();
2551 uint64_t address
= this->address();
2552 off_t startoff
= this->offset();
2553 off_t off
= startoff
+ this->first_input_offset_
;
2554 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2555 p
!= this->input_sections_
.end();
2558 off
= align_address(off
, p
->addralign());
2559 p
->set_address_and_file_offset(address
+ (off
- startoff
), off
,
2561 off
+= p
->data_size();
2564 this->set_data_size(off
- startoff
);
2567 // Reset the address and file offset.
2570 Output_section::do_reset_address_and_file_offset()
2572 // An unallocated section has no address. Forcing this means that
2573 // we don't need special treatment for symbols defined in debug
2574 // sections. We do the same in the constructor.
2575 if ((this->flags_
& elfcpp::SHF_ALLOC
) == 0)
2576 this->set_address(0);
2578 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2579 p
!= this->input_sections_
.end();
2581 p
->reset_address_and_file_offset();
2584 // Return true if address and file offset have the values after reset.
2587 Output_section::do_address_and_file_offset_have_reset_values() const
2589 if (this->is_offset_valid())
2592 // An unallocated section has address 0 after its construction or a reset.
2593 if ((this->flags_
& elfcpp::SHF_ALLOC
) == 0)
2594 return this->is_address_valid() && this->address() == 0;
2596 return !this->is_address_valid();
2599 // Set the TLS offset. Called only for SHT_TLS sections.
2602 Output_section::do_set_tls_offset(uint64_t tls_base
)
2604 this->tls_offset_
= this->address() - tls_base
;
2607 // In a few cases we need to sort the input sections attached to an
2608 // output section. This is used to implement the type of constructor
2609 // priority ordering implemented by the GNU linker, in which the
2610 // priority becomes part of the section name and the sections are
2611 // sorted by name. We only do this for an output section if we see an
2612 // attached input section matching ".ctor.*", ".dtor.*",
2613 // ".init_array.*" or ".fini_array.*".
2615 class Output_section::Input_section_sort_entry
2618 Input_section_sort_entry()
2619 : input_section_(), index_(-1U), section_has_name_(false),
2623 Input_section_sort_entry(const Input_section
& input_section
,
2625 : input_section_(input_section
), index_(index
),
2626 section_has_name_(input_section
.is_input_section()
2627 || input_section
.is_relaxed_input_section())
2629 if (this->section_has_name_
)
2631 // This is only called single-threaded from Layout::finalize,
2632 // so it is OK to lock. Unfortunately we have no way to pass
2634 const Task
* dummy_task
= reinterpret_cast<const Task
*>(-1);
2635 Object
* obj
= (input_section
.is_input_section()
2636 ? input_section
.relobj()
2637 : input_section
.relaxed_input_section()->relobj());
2638 Task_lock_obj
<Object
> tl(dummy_task
, obj
);
2640 // This is a slow operation, which should be cached in
2641 // Layout::layout if this becomes a speed problem.
2642 this->section_name_
= obj
->section_name(input_section
.shndx());
2646 // Return the Input_section.
2647 const Input_section
&
2648 input_section() const
2650 gold_assert(this->index_
!= -1U);
2651 return this->input_section_
;
2654 // The index of this entry in the original list. This is used to
2655 // make the sort stable.
2659 gold_assert(this->index_
!= -1U);
2660 return this->index_
;
2663 // Whether there is a section name.
2665 section_has_name() const
2666 { return this->section_has_name_
; }
2668 // The section name.
2670 section_name() const
2672 gold_assert(this->section_has_name_
);
2673 return this->section_name_
;
2676 // Return true if the section name has a priority. This is assumed
2677 // to be true if it has a dot after the initial dot.
2679 has_priority() const
2681 gold_assert(this->section_has_name_
);
2682 return this->section_name_
.find('.', 1);
2685 // Return true if this an input file whose base name matches
2686 // FILE_NAME. The base name must have an extension of ".o", and
2687 // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o".
2688 // This is to match crtbegin.o as well as crtbeginS.o without
2689 // getting confused by other possibilities. Overall matching the
2690 // file name this way is a dreadful hack, but the GNU linker does it
2691 // in order to better support gcc, and we need to be compatible.
2693 match_file_name(const char* match_file_name
) const
2695 const std::string
& file_name(this->input_section_
.relobj()->name());
2696 const char* base_name
= lbasename(file_name
.c_str());
2697 size_t match_len
= strlen(match_file_name
);
2698 if (strncmp(base_name
, match_file_name
, match_len
) != 0)
2700 size_t base_len
= strlen(base_name
);
2701 if (base_len
!= match_len
+ 2 && base_len
!= match_len
+ 3)
2703 return memcmp(base_name
+ base_len
- 2, ".o", 2) == 0;
2707 // The Input_section we are sorting.
2708 Input_section input_section_
;
2709 // The index of this Input_section in the original list.
2710 unsigned int index_
;
2711 // Whether this Input_section has a section name--it won't if this
2712 // is some random Output_section_data.
2713 bool section_has_name_
;
2714 // The section name if there is one.
2715 std::string section_name_
;
2718 // Return true if S1 should come before S2 in the output section.
2721 Output_section::Input_section_sort_compare::operator()(
2722 const Output_section::Input_section_sort_entry
& s1
,
2723 const Output_section::Input_section_sort_entry
& s2
) const
2725 // crtbegin.o must come first.
2726 bool s1_begin
= s1
.match_file_name("crtbegin");
2727 bool s2_begin
= s2
.match_file_name("crtbegin");
2728 if (s1_begin
|| s2_begin
)
2734 return s1
.index() < s2
.index();
2737 // crtend.o must come last.
2738 bool s1_end
= s1
.match_file_name("crtend");
2739 bool s2_end
= s2
.match_file_name("crtend");
2740 if (s1_end
|| s2_end
)
2746 return s1
.index() < s2
.index();
2749 // We sort all the sections with no names to the end.
2750 if (!s1
.section_has_name() || !s2
.section_has_name())
2752 if (s1
.section_has_name())
2754 if (s2
.section_has_name())
2756 return s1
.index() < s2
.index();
2759 // A section with a priority follows a section without a priority.
2760 // The GNU linker does this for all but .init_array sections; until
2761 // further notice we'll assume that that is an mistake.
2762 bool s1_has_priority
= s1
.has_priority();
2763 bool s2_has_priority
= s2
.has_priority();
2764 if (s1_has_priority
&& !s2_has_priority
)
2766 if (!s1_has_priority
&& s2_has_priority
)
2769 // Otherwise we sort by name.
2770 int compare
= s1
.section_name().compare(s2
.section_name());
2774 // Otherwise we keep the input order.
2775 return s1
.index() < s2
.index();
2778 // Sort the input sections attached to an output section.
2781 Output_section::sort_attached_input_sections()
2783 if (this->attached_input_sections_are_sorted_
)
2786 if (this->checkpoint_
!= NULL
2787 && !this->checkpoint_
->input_sections_saved())
2788 this->checkpoint_
->save_input_sections();
2790 // The only thing we know about an input section is the object and
2791 // the section index. We need the section name. Recomputing this
2792 // is slow but this is an unusual case. If this becomes a speed
2793 // problem we can cache the names as required in Layout::layout.
2795 // We start by building a larger vector holding a copy of each
2796 // Input_section, plus its current index in the list and its name.
2797 std::vector
<Input_section_sort_entry
> sort_list
;
2800 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2801 p
!= this->input_sections_
.end();
2803 sort_list
.push_back(Input_section_sort_entry(*p
, i
));
2805 // Sort the input sections.
2806 std::sort(sort_list
.begin(), sort_list
.end(), Input_section_sort_compare());
2808 // Copy the sorted input sections back to our list.
2809 this->input_sections_
.clear();
2810 for (std::vector
<Input_section_sort_entry
>::iterator p
= sort_list
.begin();
2811 p
!= sort_list
.end();
2813 this->input_sections_
.push_back(p
->input_section());
2815 // Remember that we sorted the input sections, since we might get
2817 this->attached_input_sections_are_sorted_
= true;
2820 // Write the section header to *OSHDR.
2822 template<int size
, bool big_endian
>
2824 Output_section::write_header(const Layout
* layout
,
2825 const Stringpool
* secnamepool
,
2826 elfcpp::Shdr_write
<size
, big_endian
>* oshdr
) const
2828 oshdr
->put_sh_name(secnamepool
->get_offset(this->name_
));
2829 oshdr
->put_sh_type(this->type_
);
2831 elfcpp::Elf_Xword flags
= this->flags_
;
2832 if (this->info_section_
!= NULL
&& this->info_uses_section_index_
)
2833 flags
|= elfcpp::SHF_INFO_LINK
;
2834 oshdr
->put_sh_flags(flags
);
2836 oshdr
->put_sh_addr(this->address());
2837 oshdr
->put_sh_offset(this->offset());
2838 oshdr
->put_sh_size(this->data_size());
2839 if (this->link_section_
!= NULL
)
2840 oshdr
->put_sh_link(this->link_section_
->out_shndx());
2841 else if (this->should_link_to_symtab_
)
2842 oshdr
->put_sh_link(layout
->symtab_section()->out_shndx());
2843 else if (this->should_link_to_dynsym_
)
2844 oshdr
->put_sh_link(layout
->dynsym_section()->out_shndx());
2846 oshdr
->put_sh_link(this->link_
);
2848 elfcpp::Elf_Word info
;
2849 if (this->info_section_
!= NULL
)
2851 if (this->info_uses_section_index_
)
2852 info
= this->info_section_
->out_shndx();
2854 info
= this->info_section_
->symtab_index();
2856 else if (this->info_symndx_
!= NULL
)
2857 info
= this->info_symndx_
->symtab_index();
2860 oshdr
->put_sh_info(info
);
2862 oshdr
->put_sh_addralign(this->addralign_
);
2863 oshdr
->put_sh_entsize(this->entsize_
);
2866 // Write out the data. For input sections the data is written out by
2867 // Object::relocate, but we have to handle Output_section_data objects
2871 Output_section::do_write(Output_file
* of
)
2873 gold_assert(!this->requires_postprocessing());
2875 // If the target performs relaxation, we delay filler generation until now.
2876 gold_assert(!this->generate_code_fills_at_write_
|| this->fills_
.empty());
2878 off_t output_section_file_offset
= this->offset();
2879 for (Fill_list::iterator p
= this->fills_
.begin();
2880 p
!= this->fills_
.end();
2883 std::string
fill_data(parameters
->target().code_fill(p
->length()));
2884 of
->write(output_section_file_offset
+ p
->section_offset(),
2885 fill_data
.data(), fill_data
.size());
2888 off_t off
= this->offset() + this->first_input_offset_
;
2889 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2890 p
!= this->input_sections_
.end();
2893 off_t aligned_off
= align_address(off
, p
->addralign());
2894 if (this->generate_code_fills_at_write_
&& (off
!= aligned_off
))
2896 size_t fill_len
= aligned_off
- off
;
2897 std::string
fill_data(parameters
->target().code_fill(fill_len
));
2898 of
->write(off
, fill_data
.data(), fill_data
.size());
2902 off
= aligned_off
+ p
->data_size();
2906 // If a section requires postprocessing, create the buffer to use.
2909 Output_section::create_postprocessing_buffer()
2911 gold_assert(this->requires_postprocessing());
2913 if (this->postprocessing_buffer_
!= NULL
)
2916 if (!this->input_sections_
.empty())
2918 off_t off
= this->first_input_offset_
;
2919 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2920 p
!= this->input_sections_
.end();
2923 off
= align_address(off
, p
->addralign());
2924 p
->finalize_data_size();
2925 off
+= p
->data_size();
2927 this->set_current_data_size_for_child(off
);
2930 off_t buffer_size
= this->current_data_size_for_child();
2931 this->postprocessing_buffer_
= new unsigned char[buffer_size
];
2934 // Write all the data of an Output_section into the postprocessing
2935 // buffer. This is used for sections which require postprocessing,
2936 // such as compression. Input sections are handled by
2937 // Object::Relocate.
2940 Output_section::write_to_postprocessing_buffer()
2942 gold_assert(this->requires_postprocessing());
2944 // If the target performs relaxation, we delay filler generation until now.
2945 gold_assert(!this->generate_code_fills_at_write_
|| this->fills_
.empty());
2947 unsigned char* buffer
= this->postprocessing_buffer();
2948 for (Fill_list::iterator p
= this->fills_
.begin();
2949 p
!= this->fills_
.end();
2952 std::string
fill_data(parameters
->target().code_fill(p
->length()));
2953 memcpy(buffer
+ p
->section_offset(), fill_data
.data(),
2957 off_t off
= this->first_input_offset_
;
2958 for (Input_section_list::iterator p
= this->input_sections_
.begin();
2959 p
!= this->input_sections_
.end();
2962 off_t aligned_off
= align_address(off
, p
->addralign());
2963 if (this->generate_code_fills_at_write_
&& (off
!= aligned_off
))
2965 size_t fill_len
= aligned_off
- off
;
2966 std::string
fill_data(parameters
->target().code_fill(fill_len
));
2967 memcpy(buffer
+ off
, fill_data
.data(), fill_data
.size());
2970 p
->write_to_buffer(buffer
+ aligned_off
);
2971 off
= aligned_off
+ p
->data_size();
2975 // Get the input sections for linker script processing. We leave
2976 // behind the Output_section_data entries. Note that this may be
2977 // slightly incorrect for merge sections. We will leave them behind,
2978 // but it is possible that the script says that they should follow
2979 // some other input sections, as in:
2980 // .rodata { *(.rodata) *(.rodata.cst*) }
2981 // For that matter, we don't handle this correctly:
2982 // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) }
2983 // With luck this will never matter.
2986 Output_section::get_input_sections(
2988 const std::string
& fill
,
2989 std::list
<Simple_input_section
>* input_sections
)
2991 if (this->checkpoint_
!= NULL
2992 && !this->checkpoint_
->input_sections_saved())
2993 this->checkpoint_
->save_input_sections();
2995 // Invalidate the relaxed input section map.
2996 this->is_relaxed_input_section_map_valid_
= false;
2998 uint64_t orig_address
= address
;
3000 address
= align_address(address
, this->addralign());
3002 Input_section_list remaining
;
3003 for (Input_section_list::iterator p
= this->input_sections_
.begin();
3004 p
!= this->input_sections_
.end();
3007 if (p
->is_input_section())
3008 input_sections
->push_back(Simple_input_section(p
->relobj(),
3010 else if (p
->is_relaxed_input_section())
3011 input_sections
->push_back(
3012 Simple_input_section(p
->relaxed_input_section()));
3015 uint64_t aligned_address
= align_address(address
, p
->addralign());
3016 if (aligned_address
!= address
&& !fill
.empty())
3018 section_size_type length
=
3019 convert_to_section_size_type(aligned_address
- address
);
3020 std::string this_fill
;
3021 this_fill
.reserve(length
);
3022 while (this_fill
.length() + fill
.length() <= length
)
3024 if (this_fill
.length() < length
)
3025 this_fill
.append(fill
, 0, length
- this_fill
.length());
3027 Output_section_data
* posd
= new Output_data_const(this_fill
, 0);
3028 remaining
.push_back(Input_section(posd
));
3030 address
= aligned_address
;
3032 remaining
.push_back(*p
);
3034 p
->finalize_data_size();
3035 address
+= p
->data_size();
3039 this->input_sections_
.swap(remaining
);
3040 this->first_input_offset_
= 0;
3042 uint64_t data_size
= address
- orig_address
;
3043 this->set_current_data_size_for_child(data_size
);
3047 // Add an simple input section.
3050 Output_section::add_simple_input_section(const Simple_input_section
& sis
,
3054 if (addralign
> this->addralign_
)
3055 this->addralign_
= addralign
;
3057 off_t offset_in_section
= this->current_data_size_for_child();
3058 off_t aligned_offset_in_section
= align_address(offset_in_section
,
3061 this->set_current_data_size_for_child(aligned_offset_in_section
3065 (sis
.is_relaxed_input_section()
3066 ? Input_section(sis
.relaxed_input_section())
3067 : Input_section(sis
.relobj(), sis
.shndx(), data_size
, addralign
));
3068 this->input_sections_
.push_back(is
);
3071 // Save states for relaxation.
3074 Output_section::save_states()
3076 gold_assert(this->checkpoint_
== NULL
);
3077 Checkpoint_output_section
* checkpoint
=
3078 new Checkpoint_output_section(this->addralign_
, this->flags_
,
3079 this->input_sections_
,
3080 this->first_input_offset_
,
3081 this->attached_input_sections_are_sorted_
);
3082 this->checkpoint_
= checkpoint
;
3083 gold_assert(this->fills_
.empty());
3087 Output_section::discard_states()
3089 gold_assert(this->checkpoint_
!= NULL
);
3090 delete this->checkpoint_
;
3091 this->checkpoint_
= NULL
;
3092 gold_assert(this->fills_
.empty());
3094 // Simply invalidate the relaxed input section map since we do not keep
3096 this->is_relaxed_input_section_map_valid_
= false;
3100 Output_section::restore_states()
3102 gold_assert(this->checkpoint_
!= NULL
);
3103 Checkpoint_output_section
* checkpoint
= this->checkpoint_
;
3105 this->addralign_
= checkpoint
->addralign();
3106 this->flags_
= checkpoint
->flags();
3107 this->first_input_offset_
= checkpoint
->first_input_offset();
3109 if (!checkpoint
->input_sections_saved())
3111 // If we have not copied the input sections, just resize it.
3112 size_t old_size
= checkpoint
->input_sections_size();
3113 gold_assert(this->input_sections_
.size() >= old_size
);
3114 this->input_sections_
.resize(old_size
);
3118 // We need to copy the whole list. This is not efficient for
3119 // extremely large output with hundreads of thousands of input
3120 // objects. We may need to re-think how we should pass sections
3122 this->input_sections_
= *checkpoint
->input_sections();
3125 this->attached_input_sections_are_sorted_
=
3126 checkpoint
->attached_input_sections_are_sorted();
3128 // Simply invalidate the relaxed input section map since we do not keep
3130 this->is_relaxed_input_section_map_valid_
= false;
3133 // Update the section offsets of input sections in this. This is required if
3134 // relaxation causes some input sections to change sizes.
3137 Output_section::adjust_section_offsets()
3139 if (!this->section_offsets_need_adjustment_
)
3143 for (Input_section_list::iterator p
= this->input_sections_
.begin();
3144 p
!= this->input_sections_
.end();
3147 off
= align_address(off
, p
->addralign());
3148 if (p
->is_input_section())
3149 p
->relobj()->set_section_offset(p
->shndx(), off
);
3150 off
+= p
->data_size();
3153 this->section_offsets_need_adjustment_
= false;
3156 // Print to the map file.
3159 Output_section::do_print_to_mapfile(Mapfile
* mapfile
) const
3161 mapfile
->print_output_section(this);
3163 for (Input_section_list::const_iterator p
= this->input_sections_
.begin();
3164 p
!= this->input_sections_
.end();
3166 p
->print_to_mapfile(mapfile
);
3169 // Print stats for merge sections to stderr.
3172 Output_section::print_merge_stats()
3174 Input_section_list::iterator p
;
3175 for (p
= this->input_sections_
.begin();
3176 p
!= this->input_sections_
.end();
3178 p
->print_merge_stats(this->name_
);
3181 // Output segment methods.
3183 Output_segment::Output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
3195 is_max_align_known_(false),
3196 are_addresses_set_(false),
3197 is_large_data_segment_(false)
3199 // The ELF ABI specifies that a PT_TLS segment always has PF_R as
3201 if (type
== elfcpp::PT_TLS
)
3202 this->flags_
= elfcpp::PF_R
;
3205 // Add an Output_section to an Output_segment.
3208 Output_segment::add_output_section(Output_section
* os
,
3209 elfcpp::Elf_Word seg_flags
,
3212 gold_assert((os
->flags() & elfcpp::SHF_ALLOC
) != 0);
3213 gold_assert(!this->is_max_align_known_
);
3214 gold_assert(os
->is_large_data_section() == this->is_large_data_segment());
3215 gold_assert(this->type() == elfcpp::PT_LOAD
|| !do_sort
);
3217 this->update_flags_for_output_section(seg_flags
);
3219 Output_segment::Output_data_list
* pdl
;
3220 if (os
->type() == elfcpp::SHT_NOBITS
)
3221 pdl
= &this->output_bss_
;
3223 pdl
= &this->output_data_
;
3225 // Note that while there may be many input sections in an output
3226 // section, there are normally only a few output sections in an
3227 // output segment. The loops below are expected to be fast.
3229 // So that PT_NOTE segments will work correctly, we need to ensure
3230 // that all SHT_NOTE sections are adjacent.
3231 if (os
->type() == elfcpp::SHT_NOTE
&& !pdl
->empty())
3233 Output_segment::Output_data_list::iterator p
= pdl
->end();
3237 if ((*p
)->is_section_type(elfcpp::SHT_NOTE
))
3244 while (p
!= pdl
->begin());
3247 // Similarly, so that PT_TLS segments will work, we need to group
3248 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
3249 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
3250 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
3251 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
3252 // and the PT_TLS segment; we do this grouping only for the PT_LOAD
3254 if (this->type_
!= elfcpp::PT_TLS
3255 && (os
->flags() & elfcpp::SHF_TLS
) != 0)
3257 pdl
= &this->output_data_
;
3260 bool nobits
= os
->type() == elfcpp::SHT_NOBITS
;
3261 bool sawtls
= false;
3262 Output_segment::Output_data_list::iterator p
= pdl
->end();
3263 gold_assert(p
!= pdl
->begin());
3268 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
3271 // Put a NOBITS section after the first TLS section.
3272 // Put a PROGBITS section after the first
3273 // TLS/PROGBITS section.
3274 insert
= nobits
|| !(*p
)->is_section_type(elfcpp::SHT_NOBITS
);
3278 // If we've gone past the TLS sections, but we've
3279 // seen a TLS section, then we need to insert this
3291 while (p
!= pdl
->begin());
3294 // There are no TLS sections yet; put this one at the requested
3295 // location in the section list.
3300 // For the PT_GNU_RELRO segment, we need to group relro
3301 // sections, and we need to put them before any non-relro
3302 // sections. Any relro local sections go before relro non-local
3303 // sections. One section may be marked as the last relro
3307 gold_assert(pdl
== &this->output_data_
);
3308 Output_segment::Output_data_list::iterator p
;
3309 for (p
= pdl
->begin(); p
!= pdl
->end(); ++p
)
3311 if (!(*p
)->is_section())
3314 Output_section
* pos
= (*p
)->output_section();
3315 if (!pos
->is_relro()
3316 || (os
->is_relro_local() && !pos
->is_relro_local())
3317 || (!os
->is_last_relro() && pos
->is_last_relro()))
3325 // One section may be marked as the first section which follows
3326 // the relro sections.
3327 if (os
->is_first_non_relro())
3329 gold_assert(pdl
== &this->output_data_
);
3330 Output_segment::Output_data_list::iterator p
;
3331 for (p
= pdl
->begin(); p
!= pdl
->end(); ++p
)
3333 if (!(*p
)->is_section())
3336 Output_section
* pos
= (*p
)->output_section();
3337 if (!pos
->is_relro())
3346 // Small data sections go at the end of the list of data sections.
3347 // If OS is not small, and there are small sections, we have to
3348 // insert it before the first small section.
3349 if (os
->type() != elfcpp::SHT_NOBITS
3350 && !os
->is_small_section()
3352 && pdl
->back()->is_section()
3353 && pdl
->back()->output_section()->is_small_section())
3355 for (Output_segment::Output_data_list::iterator p
= pdl
->begin();
3359 if ((*p
)->is_section()
3360 && (*p
)->output_section()->is_small_section())
3369 // A small BSS section goes at the start of the BSS sections, after
3370 // other small BSS sections.
3371 if (os
->type() == elfcpp::SHT_NOBITS
&& os
->is_small_section())
3373 for (Output_segment::Output_data_list::iterator p
= pdl
->begin();
3377 if (!(*p
)->is_section()
3378 || !(*p
)->output_section()->is_small_section())
3386 // A large BSS section goes at the end of the BSS sections, which
3387 // means that one that is not large must come before the first large
3389 if (os
->type() == elfcpp::SHT_NOBITS
3390 && !os
->is_large_section()
3392 && pdl
->back()->is_section()
3393 && pdl
->back()->output_section()->is_large_section())
3395 for (Output_segment::Output_data_list::iterator p
= pdl
->begin();
3399 if ((*p
)->is_section()
3400 && (*p
)->output_section()->is_large_section())
3409 // We do some further output section sorting in order to make the
3410 // generated program run more efficiently. We should only do this
3411 // when not using a linker script, so it is controled by the DO_SORT
3415 // FreeBSD requires the .interp section to be in the first page
3416 // of the executable. That is a more efficient location anyhow
3417 // for any OS, since it means that the kernel will have the data
3418 // handy after it reads the program headers.
3419 if (os
->is_interp() && !pdl
->empty())
3421 pdl
->insert(pdl
->begin(), os
);
3425 // Put loadable non-writable notes immediately after the .interp
3426 // sections, so that the PT_NOTE segment is on the first page of
3428 if (os
->type() == elfcpp::SHT_NOTE
3429 && (os
->flags() & elfcpp::SHF_WRITE
) == 0
3432 Output_segment::Output_data_list::iterator p
= pdl
->begin();
3433 if ((*p
)->is_section() && (*p
)->output_section()->is_interp())
3439 // If this section is used by the dynamic linker, and it is not
3440 // writable, then put it first, after the .interp section and
3441 // any loadable notes. This makes it more likely that the
3442 // dynamic linker will have to read less data from the disk.
3443 if (os
->is_dynamic_linker_section()
3445 && (os
->flags() & elfcpp::SHF_WRITE
) == 0)
3447 bool is_reloc
= (os
->type() == elfcpp::SHT_REL
3448 || os
->type() == elfcpp::SHT_RELA
);
3449 Output_segment::Output_data_list::iterator p
= pdl
->begin();
3450 while (p
!= pdl
->end()
3451 && (*p
)->is_section()
3452 && ((*p
)->output_section()->is_dynamic_linker_section()
3453 || (*p
)->output_section()->type() == elfcpp::SHT_NOTE
))
3455 // Put reloc sections after the other ones. Putting the
3456 // dynamic reloc sections first confuses BFD, notably
3457 // objcopy and strip.
3459 && ((*p
)->output_section()->type() == elfcpp::SHT_REL
3460 || (*p
)->output_section()->type() == elfcpp::SHT_RELA
))
3469 // If there were no constraints on the output section, just add it
3470 // to the end of the list.
3474 // Remove an Output_section from this segment. It is an error if it
3478 Output_segment::remove_output_section(Output_section
* os
)
3480 // We only need this for SHT_PROGBITS.
3481 gold_assert(os
->type() == elfcpp::SHT_PROGBITS
);
3482 for (Output_data_list::iterator p
= this->output_data_
.begin();
3483 p
!= this->output_data_
.end();
3488 this->output_data_
.erase(p
);
3495 // Add an Output_data (which need not be an Output_section) to the
3496 // start of a segment.
3499 Output_segment::add_initial_output_data(Output_data
* od
)
3501 gold_assert(!this->is_max_align_known_
);
3502 this->output_data_
.push_front(od
);
3505 // Return whether the first data section is a relro section.
3508 Output_segment::is_first_section_relro() const
3510 return (!this->output_data_
.empty()
3511 && this->output_data_
.front()->is_section()
3512 && this->output_data_
.front()->output_section()->is_relro());
3515 // Return the maximum alignment of the Output_data in Output_segment.
3518 Output_segment::maximum_alignment()
3520 if (!this->is_max_align_known_
)
3524 addralign
= Output_segment::maximum_alignment_list(&this->output_data_
);
3525 if (addralign
> this->max_align_
)
3526 this->max_align_
= addralign
;
3528 addralign
= Output_segment::maximum_alignment_list(&this->output_bss_
);
3529 if (addralign
> this->max_align_
)
3530 this->max_align_
= addralign
;
3532 this->is_max_align_known_
= true;
3535 return this->max_align_
;
3538 // Return the maximum alignment of a list of Output_data.
3541 Output_segment::maximum_alignment_list(const Output_data_list
* pdl
)
3544 for (Output_data_list::const_iterator p
= pdl
->begin();
3548 uint64_t addralign
= (*p
)->addralign();
3549 if (addralign
> ret
)
3555 // Return the number of dynamic relocs applied to this segment.
3558 Output_segment::dynamic_reloc_count() const
3560 return (this->dynamic_reloc_count_list(&this->output_data_
)
3561 + this->dynamic_reloc_count_list(&this->output_bss_
));
3564 // Return the number of dynamic relocs applied to an Output_data_list.
3567 Output_segment::dynamic_reloc_count_list(const Output_data_list
* pdl
) const
3569 unsigned int count
= 0;
3570 for (Output_data_list::const_iterator p
= pdl
->begin();
3573 count
+= (*p
)->dynamic_reloc_count();
3577 // Set the section addresses for an Output_segment. If RESET is true,
3578 // reset the addresses first. ADDR is the address and *POFF is the
3579 // file offset. Set the section indexes starting with *PSHNDX.
3580 // Return the address of the immediately following segment. Update
3581 // *POFF and *PSHNDX.
3584 Output_segment::set_section_addresses(const Layout
* layout
, bool reset
,
3586 unsigned int increase_relro
,
3588 unsigned int* pshndx
)
3590 gold_assert(this->type_
== elfcpp::PT_LOAD
);
3592 off_t orig_off
= *poff
;
3594 // If we have relro sections, we need to pad forward now so that the
3595 // relro sections plus INCREASE_RELRO end on a common page boundary.
3596 if (parameters
->options().relro()
3597 && this->is_first_section_relro()
3598 && (!this->are_addresses_set_
|| reset
))
3600 uint64_t relro_size
= 0;
3602 for (Output_data_list::iterator p
= this->output_data_
.begin();
3603 p
!= this->output_data_
.end();
3606 if (!(*p
)->is_section())
3608 Output_section
* pos
= (*p
)->output_section();
3609 if (!pos
->is_relro())
3611 gold_assert(!(*p
)->is_section_flag_set(elfcpp::SHF_TLS
));
3612 if ((*p
)->is_address_valid())
3613 relro_size
+= (*p
)->data_size();
3616 // FIXME: This could be faster.
3617 (*p
)->set_address_and_file_offset(addr
+ relro_size
,
3619 relro_size
+= (*p
)->data_size();
3620 (*p
)->reset_address_and_file_offset();
3623 relro_size
+= increase_relro
;
3625 uint64_t page_align
= parameters
->target().common_pagesize();
3627 // Align to offset N such that (N + RELRO_SIZE) % PAGE_ALIGN == 0.
3628 uint64_t desired_align
= page_align
- (relro_size
% page_align
);
3629 if (desired_align
< *poff
% page_align
)
3630 *poff
+= page_align
- *poff
% page_align
;
3631 *poff
+= desired_align
- *poff
% page_align
;
3632 addr
+= *poff
- orig_off
;
3636 if (!reset
&& this->are_addresses_set_
)
3638 gold_assert(this->paddr_
== addr
);
3639 addr
= this->vaddr_
;
3643 this->vaddr_
= addr
;
3644 this->paddr_
= addr
;
3645 this->are_addresses_set_
= true;
3648 bool in_tls
= false;
3650 this->offset_
= orig_off
;
3652 addr
= this->set_section_list_addresses(layout
, reset
, &this->output_data_
,
3653 addr
, poff
, pshndx
, &in_tls
);
3654 this->filesz_
= *poff
- orig_off
;
3658 uint64_t ret
= this->set_section_list_addresses(layout
, reset
,
3663 // If the last section was a TLS section, align upward to the
3664 // alignment of the TLS segment, so that the overall size of the TLS
3665 // segment is aligned.
3668 uint64_t segment_align
= layout
->tls_segment()->maximum_alignment();
3669 *poff
= align_address(*poff
, segment_align
);
3672 this->memsz_
= *poff
- orig_off
;
3674 // Ignore the file offset adjustments made by the BSS Output_data
3681 // Set the addresses and file offsets in a list of Output_data
3685 Output_segment::set_section_list_addresses(const Layout
* layout
, bool reset
,
3686 Output_data_list
* pdl
,
3687 uint64_t addr
, off_t
* poff
,
3688 unsigned int* pshndx
,
3691 off_t startoff
= *poff
;
3693 off_t off
= startoff
;
3694 for (Output_data_list::iterator p
= pdl
->begin();
3699 (*p
)->reset_address_and_file_offset();
3701 // When using a linker script the section will most likely
3702 // already have an address.
3703 if (!(*p
)->is_address_valid())
3705 uint64_t align
= (*p
)->addralign();
3707 if ((*p
)->is_section_flag_set(elfcpp::SHF_TLS
))
3709 // Give the first TLS section the alignment of the
3710 // entire TLS segment. Otherwise the TLS segment as a
3711 // whole may be misaligned.
3714 Output_segment
* tls_segment
= layout
->tls_segment();
3715 gold_assert(tls_segment
!= NULL
);
3716 uint64_t segment_align
= tls_segment
->maximum_alignment();
3717 gold_assert(segment_align
>= align
);
3718 align
= segment_align
;
3725 // If this is the first section after the TLS segment,
3726 // align it to at least the alignment of the TLS
3727 // segment, so that the size of the overall TLS segment
3731 uint64_t segment_align
=
3732 layout
->tls_segment()->maximum_alignment();
3733 if (segment_align
> align
)
3734 align
= segment_align
;
3740 off
= align_address(off
, align
);
3741 (*p
)->set_address_and_file_offset(addr
+ (off
- startoff
), off
);
3745 // The script may have inserted a skip forward, but it
3746 // better not have moved backward.
3747 if ((*p
)->address() >= addr
+ (off
- startoff
))
3748 off
+= (*p
)->address() - (addr
+ (off
- startoff
));
3751 if (!layout
->script_options()->saw_sections_clause())
3755 Output_section
* os
= (*p
)->output_section();
3757 // Cast to unsigned long long to avoid format warnings.
3758 unsigned long long previous_dot
=
3759 static_cast<unsigned long long>(addr
+ (off
- startoff
));
3760 unsigned long long dot
=
3761 static_cast<unsigned long long>((*p
)->address());
3764 gold_error(_("dot moves backward in linker script "
3765 "from 0x%llx to 0x%llx"), previous_dot
, dot
);
3767 gold_error(_("address of section '%s' moves backward "
3768 "from 0x%llx to 0x%llx"),
3769 os
->name(), previous_dot
, dot
);
3772 (*p
)->set_file_offset(off
);
3773 (*p
)->finalize_data_size();
3776 // We want to ignore the size of a SHF_TLS or SHT_NOBITS
3777 // section. Such a section does not affect the size of a
3779 if (!(*p
)->is_section_flag_set(elfcpp::SHF_TLS
)
3780 || !(*p
)->is_section_type(elfcpp::SHT_NOBITS
))
3781 off
+= (*p
)->data_size();
3783 if ((*p
)->is_section())
3785 (*p
)->set_out_shndx(*pshndx
);
3791 return addr
+ (off
- startoff
);
3794 // For a non-PT_LOAD segment, set the offset from the sections, if
3795 // any. Add INCREASE to the file size and the memory size.
3798 Output_segment::set_offset(unsigned int increase
)
3800 gold_assert(this->type_
!= elfcpp::PT_LOAD
);
3802 gold_assert(!this->are_addresses_set_
);
3804 if (this->output_data_
.empty() && this->output_bss_
.empty())
3806 gold_assert(increase
== 0);
3809 this->are_addresses_set_
= true;
3811 this->min_p_align_
= 0;
3817 const Output_data
* first
;
3818 if (this->output_data_
.empty())
3819 first
= this->output_bss_
.front();
3821 first
= this->output_data_
.front();
3822 this->vaddr_
= first
->address();
3823 this->paddr_
= (first
->has_load_address()
3824 ? first
->load_address()
3826 this->are_addresses_set_
= true;
3827 this->offset_
= first
->offset();
3829 if (this->output_data_
.empty())
3833 const Output_data
* last_data
= this->output_data_
.back();
3834 this->filesz_
= (last_data
->address()
3835 + last_data
->data_size()
3839 const Output_data
* last
;
3840 if (this->output_bss_
.empty())
3841 last
= this->output_data_
.back();
3843 last
= this->output_bss_
.back();
3844 this->memsz_
= (last
->address()
3848 this->filesz_
+= increase
;
3849 this->memsz_
+= increase
;
3851 // If this is a TLS segment, align the memory size. The code in
3852 // set_section_list ensures that the section after the TLS segment
3853 // is aligned to give us room.
3854 if (this->type_
== elfcpp::PT_TLS
)
3856 uint64_t segment_align
= this->maximum_alignment();
3857 gold_assert(this->vaddr_
== align_address(this->vaddr_
, segment_align
));
3858 this->memsz_
= align_address(this->memsz_
, segment_align
);
3862 // Set the TLS offsets of the sections in the PT_TLS segment.
3865 Output_segment::set_tls_offsets()
3867 gold_assert(this->type_
== elfcpp::PT_TLS
);
3869 for (Output_data_list::iterator p
= this->output_data_
.begin();
3870 p
!= this->output_data_
.end();
3872 (*p
)->set_tls_offset(this->vaddr_
);
3874 for (Output_data_list::iterator p
= this->output_bss_
.begin();
3875 p
!= this->output_bss_
.end();
3877 (*p
)->set_tls_offset(this->vaddr_
);
3880 // Return the address of the first section.
3883 Output_segment::first_section_load_address() const
3885 for (Output_data_list::const_iterator p
= this->output_data_
.begin();
3886 p
!= this->output_data_
.end();
3888 if ((*p
)->is_section())
3889 return (*p
)->has_load_address() ? (*p
)->load_address() : (*p
)->address();
3891 for (Output_data_list::const_iterator p
= this->output_bss_
.begin();
3892 p
!= this->output_bss_
.end();
3894 if ((*p
)->is_section())
3895 return (*p
)->has_load_address() ? (*p
)->load_address() : (*p
)->address();
3900 // Return the number of Output_sections in an Output_segment.
3903 Output_segment::output_section_count() const
3905 return (this->output_section_count_list(&this->output_data_
)
3906 + this->output_section_count_list(&this->output_bss_
));
3909 // Return the number of Output_sections in an Output_data_list.
3912 Output_segment::output_section_count_list(const Output_data_list
* pdl
) const
3914 unsigned int count
= 0;
3915 for (Output_data_list::const_iterator p
= pdl
->begin();
3919 if ((*p
)->is_section())
3925 // Return the section attached to the list segment with the lowest
3926 // load address. This is used when handling a PHDRS clause in a
3930 Output_segment::section_with_lowest_load_address() const
3932 Output_section
* found
= NULL
;
3933 uint64_t found_lma
= 0;
3934 this->lowest_load_address_in_list(&this->output_data_
, &found
, &found_lma
);
3936 Output_section
* found_data
= found
;
3937 this->lowest_load_address_in_list(&this->output_bss_
, &found
, &found_lma
);
3938 if (found
!= found_data
&& found_data
!= NULL
)
3940 gold_error(_("nobits section %s may not precede progbits section %s "
3942 found
->name(), found_data
->name());
3949 // Look through a list for a section with a lower load address.
3952 Output_segment::lowest_load_address_in_list(const Output_data_list
* pdl
,
3953 Output_section
** found
,
3954 uint64_t* found_lma
) const
3956 for (Output_data_list::const_iterator p
= pdl
->begin();
3960 if (!(*p
)->is_section())
3962 Output_section
* os
= static_cast<Output_section
*>(*p
);
3963 uint64_t lma
= (os
->has_load_address()
3964 ? os
->load_address()
3966 if (*found
== NULL
|| lma
< *found_lma
)
3974 // Write the segment data into *OPHDR.
3976 template<int size
, bool big_endian
>
3978 Output_segment::write_header(elfcpp::Phdr_write
<size
, big_endian
>* ophdr
)
3980 ophdr
->put_p_type(this->type_
);
3981 ophdr
->put_p_offset(this->offset_
);
3982 ophdr
->put_p_vaddr(this->vaddr_
);
3983 ophdr
->put_p_paddr(this->paddr_
);
3984 ophdr
->put_p_filesz(this->filesz_
);
3985 ophdr
->put_p_memsz(this->memsz_
);
3986 ophdr
->put_p_flags(this->flags_
);
3987 ophdr
->put_p_align(std::max(this->min_p_align_
, this->maximum_alignment()));
3990 // Write the section headers into V.
3992 template<int size
, bool big_endian
>
3994 Output_segment::write_section_headers(const Layout
* layout
,
3995 const Stringpool
* secnamepool
,
3997 unsigned int *pshndx
) const
3999 // Every section that is attached to a segment must be attached to a
4000 // PT_LOAD segment, so we only write out section headers for PT_LOAD
4002 if (this->type_
!= elfcpp::PT_LOAD
)
4005 v
= this->write_section_headers_list
<size
, big_endian
>(layout
, secnamepool
,
4006 &this->output_data_
,
4008 v
= this->write_section_headers_list
<size
, big_endian
>(layout
, secnamepool
,
4014 template<int size
, bool big_endian
>
4016 Output_segment::write_section_headers_list(const Layout
* layout
,
4017 const Stringpool
* secnamepool
,
4018 const Output_data_list
* pdl
,
4020 unsigned int* pshndx
) const
4022 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
4023 for (Output_data_list::const_iterator p
= pdl
->begin();
4027 if ((*p
)->is_section())
4029 const Output_section
* ps
= static_cast<const Output_section
*>(*p
);
4030 gold_assert(*pshndx
== ps
->out_shndx());
4031 elfcpp::Shdr_write
<size
, big_endian
> oshdr(v
);
4032 ps
->write_header(layout
, secnamepool
, &oshdr
);
4040 // Print the output sections to the map file.
4043 Output_segment::print_sections_to_mapfile(Mapfile
* mapfile
) const
4045 if (this->type() != elfcpp::PT_LOAD
)
4047 this->print_section_list_to_mapfile(mapfile
, &this->output_data_
);
4048 this->print_section_list_to_mapfile(mapfile
, &this->output_bss_
);
4051 // Print an output section list to the map file.
4054 Output_segment::print_section_list_to_mapfile(Mapfile
* mapfile
,
4055 const Output_data_list
* pdl
) const
4057 for (Output_data_list::const_iterator p
= pdl
->begin();
4060 (*p
)->print_to_mapfile(mapfile
);
4063 // Output_file methods.
4065 Output_file::Output_file(const char* name
)
4070 map_is_anonymous_(false),
4071 is_temporary_(false)
4075 // Try to open an existing file. Returns false if the file doesn't
4076 // exist, has a size of 0 or can't be mmapped.
4079 Output_file::open_for_modification()
4081 // The name "-" means "stdout".
4082 if (strcmp(this->name_
, "-") == 0)
4085 // Don't bother opening files with a size of zero.
4087 if (::stat(this->name_
, &s
) != 0 || s
.st_size
== 0)
4090 int o
= open_descriptor(-1, this->name_
, O_RDWR
, 0);
4092 gold_fatal(_("%s: open: %s"), this->name_
, strerror(errno
));
4094 this->file_size_
= s
.st_size
;
4096 // If the file can't be mmapped, copying the content to an anonymous
4097 // map will probably negate the performance benefits of incremental
4098 // linking. This could be helped by using views and loading only
4099 // the necessary parts, but this is not supported as of now.
4100 if (!this->map_no_anonymous())
4102 release_descriptor(o
, true);
4104 this->file_size_
= 0;
4111 // Open the output file.
4114 Output_file::open(off_t file_size
)
4116 this->file_size_
= file_size
;
4118 // Unlink the file first; otherwise the open() may fail if the file
4119 // is busy (e.g. it's an executable that's currently being executed).
4121 // However, the linker may be part of a system where a zero-length
4122 // file is created for it to write to, with tight permissions (gcc
4123 // 2.95 did something like this). Unlinking the file would work
4124 // around those permission controls, so we only unlink if the file
4125 // has a non-zero size. We also unlink only regular files to avoid
4126 // trouble with directories/etc.
4128 // If we fail, continue; this command is merely a best-effort attempt
4129 // to improve the odds for open().
4131 // We let the name "-" mean "stdout"
4132 if (!this->is_temporary_
)
4134 if (strcmp(this->name_
, "-") == 0)
4135 this->o_
= STDOUT_FILENO
;
4139 if (::stat(this->name_
, &s
) == 0
4140 && (S_ISREG (s
.st_mode
) || S_ISLNK (s
.st_mode
)))
4143 ::unlink(this->name_
);
4144 else if (!parameters
->options().relocatable())
4146 // If we don't unlink the existing file, add execute
4147 // permission where read permissions already exist
4148 // and where the umask permits.
4149 int mask
= ::umask(0);
4151 s
.st_mode
|= (s
.st_mode
& 0444) >> 2;
4152 ::chmod(this->name_
, s
.st_mode
& ~mask
);
4156 int mode
= parameters
->options().relocatable() ? 0666 : 0777;
4157 int o
= open_descriptor(-1, this->name_
, O_RDWR
| O_CREAT
| O_TRUNC
,
4160 gold_fatal(_("%s: open: %s"), this->name_
, strerror(errno
));
4168 // Resize the output file.
4171 Output_file::resize(off_t file_size
)
4173 // If the mmap is mapping an anonymous memory buffer, this is easy:
4174 // just mremap to the new size. If it's mapping to a file, we want
4175 // to unmap to flush to the file, then remap after growing the file.
4176 if (this->map_is_anonymous_
)
4178 void* base
= ::mremap(this->base_
, this->file_size_
, file_size
,
4180 if (base
== MAP_FAILED
)
4181 gold_fatal(_("%s: mremap: %s"), this->name_
, strerror(errno
));
4182 this->base_
= static_cast<unsigned char*>(base
);
4183 this->file_size_
= file_size
;
4188 this->file_size_
= file_size
;
4189 if (!this->map_no_anonymous())
4190 gold_fatal(_("%s: mmap: %s"), this->name_
, strerror(errno
));
4194 // Map an anonymous block of memory which will later be written to the
4195 // file. Return whether the map succeeded.
4198 Output_file::map_anonymous()
4200 void* base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
4201 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
4202 if (base
!= MAP_FAILED
)
4204 this->map_is_anonymous_
= true;
4205 this->base_
= static_cast<unsigned char*>(base
);
4211 // Map the file into memory. Return whether the mapping succeeded.
4214 Output_file::map_no_anonymous()
4216 const int o
= this->o_
;
4218 // If the output file is not a regular file, don't try to mmap it;
4219 // instead, we'll mmap a block of memory (an anonymous buffer), and
4220 // then later write the buffer to the file.
4222 struct stat statbuf
;
4223 if (o
== STDOUT_FILENO
|| o
== STDERR_FILENO
4224 || ::fstat(o
, &statbuf
) != 0
4225 || !S_ISREG(statbuf
.st_mode
)
4226 || this->is_temporary_
)
4229 // Ensure that we have disk space available for the file. If we
4230 // don't do this, it is possible that we will call munmap, close,
4231 // and exit with dirty buffers still in the cache with no assigned
4232 // disk blocks. If the disk is out of space at that point, the
4233 // output file will wind up incomplete, but we will have already
4234 // exited. The alternative to fallocate would be to use fdatasync,
4235 // but that would be a more significant performance hit.
4236 if (::posix_fallocate(o
, 0, this->file_size_
) < 0)
4237 gold_fatal(_("%s: %s"), this->name_
, strerror(errno
));
4239 // Map the file into memory.
4240 base
= ::mmap(NULL
, this->file_size_
, PROT_READ
| PROT_WRITE
,
4243 // The mmap call might fail because of file system issues: the file
4244 // system might not support mmap at all, or it might not support
4245 // mmap with PROT_WRITE.
4246 if (base
== MAP_FAILED
)
4249 this->map_is_anonymous_
= false;
4250 this->base_
= static_cast<unsigned char*>(base
);
4254 // Map the file into memory.
4259 if (this->map_no_anonymous())
4262 // The mmap call might fail because of file system issues: the file
4263 // system might not support mmap at all, or it might not support
4264 // mmap with PROT_WRITE. I'm not sure which errno values we will
4265 // see in all cases, so if the mmap fails for any reason and we
4266 // don't care about file contents, try for an anonymous map.
4267 if (this->map_anonymous())
4270 gold_fatal(_("%s: mmap: failed to allocate %lu bytes for output file: %s"),
4271 this->name_
, static_cast<unsigned long>(this->file_size_
),
4275 // Unmap the file from memory.
4278 Output_file::unmap()
4280 if (::munmap(this->base_
, this->file_size_
) < 0)
4281 gold_error(_("%s: munmap: %s"), this->name_
, strerror(errno
));
4285 // Close the output file.
4288 Output_file::close()
4290 // If the map isn't file-backed, we need to write it now.
4291 if (this->map_is_anonymous_
&& !this->is_temporary_
)
4293 size_t bytes_to_write
= this->file_size_
;
4295 while (bytes_to_write
> 0)
4297 ssize_t bytes_written
= ::write(this->o_
, this->base_
+ offset
,
4299 if (bytes_written
== 0)
4300 gold_error(_("%s: write: unexpected 0 return-value"), this->name_
);
4301 else if (bytes_written
< 0)
4302 gold_error(_("%s: write: %s"), this->name_
, strerror(errno
));
4305 bytes_to_write
-= bytes_written
;
4306 offset
+= bytes_written
;
4312 // We don't close stdout or stderr
4313 if (this->o_
!= STDOUT_FILENO
4314 && this->o_
!= STDERR_FILENO
4315 && !this->is_temporary_
)
4316 if (::close(this->o_
) < 0)
4317 gold_error(_("%s: close: %s"), this->name_
, strerror(errno
));
4321 // Instantiate the templates we need. We could use the configure
4322 // script to restrict this to only the ones for implemented targets.
4324 #ifdef HAVE_TARGET_32_LITTLE
4327 Output_section::add_input_section
<32, false>(
4328 Sized_relobj
<32, false>* object
,
4330 const char* secname
,
4331 const elfcpp::Shdr
<32, false>& shdr
,
4332 unsigned int reloc_shndx
,
4333 bool have_sections_script
);
4336 #ifdef HAVE_TARGET_32_BIG
4339 Output_section::add_input_section
<32, true>(
4340 Sized_relobj
<32, true>* object
,
4342 const char* secname
,
4343 const elfcpp::Shdr
<32, true>& shdr
,
4344 unsigned int reloc_shndx
,
4345 bool have_sections_script
);
4348 #ifdef HAVE_TARGET_64_LITTLE
4351 Output_section::add_input_section
<64, false>(
4352 Sized_relobj
<64, false>* object
,
4354 const char* secname
,
4355 const elfcpp::Shdr
<64, false>& shdr
,
4356 unsigned int reloc_shndx
,
4357 bool have_sections_script
);
4360 #ifdef HAVE_TARGET_64_BIG
4363 Output_section::add_input_section
<64, true>(
4364 Sized_relobj
<64, true>* object
,
4366 const char* secname
,
4367 const elfcpp::Shdr
<64, true>& shdr
,
4368 unsigned int reloc_shndx
,
4369 bool have_sections_script
);
4372 #ifdef HAVE_TARGET_32_LITTLE
4374 class Output_reloc
<elfcpp::SHT_REL
, false, 32, false>;
4377 #ifdef HAVE_TARGET_32_BIG
4379 class Output_reloc
<elfcpp::SHT_REL
, false, 32, true>;
4382 #ifdef HAVE_TARGET_64_LITTLE
4384 class Output_reloc
<elfcpp::SHT_REL
, false, 64, false>;
4387 #ifdef HAVE_TARGET_64_BIG
4389 class Output_reloc
<elfcpp::SHT_REL
, false, 64, true>;
4392 #ifdef HAVE_TARGET_32_LITTLE
4394 class Output_reloc
<elfcpp::SHT_REL
, true, 32, false>;
4397 #ifdef HAVE_TARGET_32_BIG
4399 class Output_reloc
<elfcpp::SHT_REL
, true, 32, true>;
4402 #ifdef HAVE_TARGET_64_LITTLE
4404 class Output_reloc
<elfcpp::SHT_REL
, true, 64, false>;
4407 #ifdef HAVE_TARGET_64_BIG
4409 class Output_reloc
<elfcpp::SHT_REL
, true, 64, true>;
4412 #ifdef HAVE_TARGET_32_LITTLE
4414 class Output_reloc
<elfcpp::SHT_RELA
, false, 32, false>;
4417 #ifdef HAVE_TARGET_32_BIG
4419 class Output_reloc
<elfcpp::SHT_RELA
, false, 32, true>;
4422 #ifdef HAVE_TARGET_64_LITTLE
4424 class Output_reloc
<elfcpp::SHT_RELA
, false, 64, false>;
4427 #ifdef HAVE_TARGET_64_BIG
4429 class Output_reloc
<elfcpp::SHT_RELA
, false, 64, true>;
4432 #ifdef HAVE_TARGET_32_LITTLE
4434 class Output_reloc
<elfcpp::SHT_RELA
, true, 32, false>;
4437 #ifdef HAVE_TARGET_32_BIG
4439 class Output_reloc
<elfcpp::SHT_RELA
, true, 32, true>;
4442 #ifdef HAVE_TARGET_64_LITTLE
4444 class Output_reloc
<elfcpp::SHT_RELA
, true, 64, false>;
4447 #ifdef HAVE_TARGET_64_BIG
4449 class Output_reloc
<elfcpp::SHT_RELA
, true, 64, true>;
4452 #ifdef HAVE_TARGET_32_LITTLE
4454 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, false>;
4457 #ifdef HAVE_TARGET_32_BIG
4459 class Output_data_reloc
<elfcpp::SHT_REL
, false, 32, true>;
4462 #ifdef HAVE_TARGET_64_LITTLE
4464 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, false>;
4467 #ifdef HAVE_TARGET_64_BIG
4469 class Output_data_reloc
<elfcpp::SHT_REL
, false, 64, true>;
4472 #ifdef HAVE_TARGET_32_LITTLE
4474 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false>;
4477 #ifdef HAVE_TARGET_32_BIG
4479 class Output_data_reloc
<elfcpp::SHT_REL
, true, 32, true>;
4482 #ifdef HAVE_TARGET_64_LITTLE
4484 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, false>;
4487 #ifdef HAVE_TARGET_64_BIG
4489 class Output_data_reloc
<elfcpp::SHT_REL
, true, 64, true>;
4492 #ifdef HAVE_TARGET_32_LITTLE
4494 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, false>;
4497 #ifdef HAVE_TARGET_32_BIG
4499 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 32, true>;
4502 #ifdef HAVE_TARGET_64_LITTLE
4504 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, false>;
4507 #ifdef HAVE_TARGET_64_BIG
4509 class Output_data_reloc
<elfcpp::SHT_RELA
, false, 64, true>;
4512 #ifdef HAVE_TARGET_32_LITTLE
4514 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, false>;
4517 #ifdef HAVE_TARGET_32_BIG
4519 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, true>;
4522 #ifdef HAVE_TARGET_64_LITTLE
4524 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false>;
4527 #ifdef HAVE_TARGET_64_BIG
4529 class Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, true>;
4532 #ifdef HAVE_TARGET_32_LITTLE
4534 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 32, false>;
4537 #ifdef HAVE_TARGET_32_BIG
4539 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 32, true>;
4542 #ifdef HAVE_TARGET_64_LITTLE
4544 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 64, false>;
4547 #ifdef HAVE_TARGET_64_BIG
4549 class Output_relocatable_relocs
<elfcpp::SHT_REL
, 64, true>;
4552 #ifdef HAVE_TARGET_32_LITTLE
4554 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 32, false>;
4557 #ifdef HAVE_TARGET_32_BIG
4559 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 32, true>;
4562 #ifdef HAVE_TARGET_64_LITTLE
4564 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 64, false>;
4567 #ifdef HAVE_TARGET_64_BIG
4569 class Output_relocatable_relocs
<elfcpp::SHT_RELA
, 64, true>;
4572 #ifdef HAVE_TARGET_32_LITTLE
4574 class Output_data_group
<32, false>;
4577 #ifdef HAVE_TARGET_32_BIG
4579 class Output_data_group
<32, true>;
4582 #ifdef HAVE_TARGET_64_LITTLE
4584 class Output_data_group
<64, false>;
4587 #ifdef HAVE_TARGET_64_BIG
4589 class Output_data_group
<64, true>;
4592 #ifdef HAVE_TARGET_32_LITTLE
4594 class Output_data_got
<32, false>;
4597 #ifdef HAVE_TARGET_32_BIG
4599 class Output_data_got
<32, true>;
4602 #ifdef HAVE_TARGET_64_LITTLE
4604 class Output_data_got
<64, false>;
4607 #ifdef HAVE_TARGET_64_BIG
4609 class Output_data_got
<64, true>;
4612 } // End namespace gold.