1 // layout.cc -- lay out output file sections for gold
3 // Copyright 2006, 2007 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
30 #include "parameters.h"
40 // Layout_task_runner methods.
42 // Lay out the sections. This is called after all the input objects
46 Layout_task_runner::run(Workqueue
* workqueue
)
48 off_t file_size
= this->layout_
->finalize(this->input_objects_
,
51 // Now we know the final size of the output file and we know where
52 // each piece of information goes.
53 Output_file
* of
= new Output_file(this->options_
,
54 this->input_objects_
->target());
57 // Queue up the final set of tasks.
58 gold::queue_final_tasks(this->options_
, this->input_objects_
,
59 this->symtab_
, this->layout_
, workqueue
, of
);
64 Layout::Layout(const General_options
& options
)
65 : options_(options
), namepool_(), sympool_(), dynpool_(), signatures_(),
66 section_name_map_(), segment_list_(), section_list_(),
67 unattached_section_list_(), special_output_list_(),
68 tls_segment_(NULL
), symtab_section_(NULL
),
69 dynsym_section_(NULL
), dynamic_section_(NULL
), dynamic_data_(NULL
),
70 eh_frame_section_(NULL
)
72 // Make space for more than enough segments for a typical file.
73 // This is just for efficiency--it's OK if we wind up needing more.
74 this->segment_list_
.reserve(12);
76 // We expect three unattached Output_data objects: the file header,
77 // the segment headers, and the section headers.
78 this->special_output_list_
.reserve(3);
81 // Hash a key we use to look up an output section mapping.
84 Layout::Hash_key::operator()(const Layout::Key
& k
) const
86 return k
.first
+ k
.second
.first
+ k
.second
.second
;
89 // Whether to include this section in the link.
91 template<int size
, bool big_endian
>
93 Layout::include_section(Object
*, const char*,
94 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
96 // Some section types are never linked. Some are only linked when
97 // doing a relocateable link.
98 switch (shdr
.get_sh_type())
100 case elfcpp::SHT_NULL
:
101 case elfcpp::SHT_SYMTAB
:
102 case elfcpp::SHT_DYNSYM
:
103 case elfcpp::SHT_STRTAB
:
104 case elfcpp::SHT_HASH
:
105 case elfcpp::SHT_DYNAMIC
:
106 case elfcpp::SHT_SYMTAB_SHNDX
:
109 case elfcpp::SHT_RELA
:
110 case elfcpp::SHT_REL
:
111 case elfcpp::SHT_GROUP
:
112 return parameters
->output_is_object();
115 // FIXME: Handle stripping debug sections here.
120 // Return an output section named NAME, or NULL if there is none.
123 Layout::find_output_section(const char* name
) const
125 for (Section_name_map::const_iterator p
= this->section_name_map_
.begin();
126 p
!= this->section_name_map_
.end();
128 if (strcmp(p
->second
->name(), name
) == 0)
133 // Return an output segment of type TYPE, with segment flags SET set
134 // and segment flags CLEAR clear. Return NULL if there is none.
137 Layout::find_output_segment(elfcpp::PT type
, elfcpp::Elf_Word set
,
138 elfcpp::Elf_Word clear
) const
140 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
141 p
!= this->segment_list_
.end();
143 if (static_cast<elfcpp::PT
>((*p
)->type()) == type
144 && ((*p
)->flags() & set
) == set
145 && ((*p
)->flags() & clear
) == 0)
150 // Return the output section to use for section NAME with type TYPE
151 // and section flags FLAGS.
154 Layout::get_output_section(const char* name
, Stringpool::Key name_key
,
155 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
)
157 // We should ignore some flags.
158 flags
&= ~ (elfcpp::SHF_INFO_LINK
159 | elfcpp::SHF_LINK_ORDER
162 | elfcpp::SHF_STRINGS
);
164 const Key
key(name_key
, std::make_pair(type
, flags
));
165 const std::pair
<Key
, Output_section
*> v(key
, NULL
);
166 std::pair
<Section_name_map::iterator
, bool> ins(
167 this->section_name_map_
.insert(v
));
170 return ins
.first
->second
;
173 // This is the first time we've seen this name/type/flags
175 Output_section
* os
= this->make_output_section(name
, type
, flags
);
176 ins
.first
->second
= os
;
181 // Return the output section to use for input section SHNDX, with name
182 // NAME, with header HEADER, from object OBJECT. Set *OFF to the
183 // offset of this input section without the output section.
185 template<int size
, bool big_endian
>
187 Layout::layout(Relobj
* object
, unsigned int shndx
, const char* name
,
188 const elfcpp::Shdr
<size
, big_endian
>& shdr
, off_t
* off
)
190 if (!this->include_section(object
, name
, shdr
))
193 // If we are not doing a relocateable link, choose the name to use
194 // for the output section.
195 size_t len
= strlen(name
);
196 if (!parameters
->output_is_object())
197 name
= Layout::output_section_name(name
, &len
);
199 // FIXME: Handle SHF_OS_NONCONFORMING here.
201 // Canonicalize the section name.
202 Stringpool::Key name_key
;
203 name
= this->namepool_
.add(name
, len
, &name_key
);
205 // Find the output section. The output section is selected based on
206 // the section name, type, and flags.
207 Output_section
* os
= this->get_output_section(name
, name_key
,
209 shdr
.get_sh_flags());
211 // Special GNU handling of sections named .eh_frame.
212 if (!parameters
->output_is_object()
213 && strcmp(name
, ".eh_frame") == 0
214 && shdr
.get_sh_size() > 0
215 && shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
216 && shdr
.get_sh_flags() == elfcpp::SHF_ALLOC
)
218 this->layout_eh_frame(object
, shndx
, name
, shdr
, os
, off
);
222 // FIXME: Handle SHF_LINK_ORDER somewhere.
224 *off
= os
->add_input_section(object
, shndx
, name
, shdr
);
229 // Special GNU handling of sections named .eh_frame. They will
230 // normally hold exception frame data.
232 template<int size
, bool big_endian
>
234 Layout::layout_eh_frame(Relobj
* object
,
237 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
238 Output_section
* os
, off_t
* off
)
240 if (this->eh_frame_section_
== NULL
)
242 this->eh_frame_section_
= os
;
244 if (this->options_
.create_eh_frame_hdr())
246 Stringpool::Key hdr_name_key
;
247 const char* hdr_name
= this->namepool_
.add(".eh_frame_hdr",
249 Output_section
* hdr_os
=
250 this->get_output_section(hdr_name
, hdr_name_key
,
251 elfcpp::SHT_PROGBITS
,
254 Eh_frame_hdr
* hdr_posd
= new Eh_frame_hdr(os
);
255 hdr_os
->add_output_section_data(hdr_posd
);
257 Output_segment
* hdr_oseg
=
258 new Output_segment(elfcpp::PT_GNU_EH_FRAME
, elfcpp::PF_R
);
259 this->segment_list_
.push_back(hdr_oseg
);
260 hdr_oseg
->add_output_section(hdr_os
, elfcpp::PF_R
);
264 gold_assert(this->eh_frame_section_
== os
);
266 *off
= os
->add_input_section(object
, shndx
, name
, shdr
);
269 // Add POSD to an output section using NAME, TYPE, and FLAGS.
272 Layout::add_output_section_data(const char* name
, elfcpp::Elf_Word type
,
273 elfcpp::Elf_Xword flags
,
274 Output_section_data
* posd
)
276 // Canonicalize the name.
277 Stringpool::Key name_key
;
278 name
= this->namepool_
.add(name
, &name_key
);
280 Output_section
* os
= this->get_output_section(name
, name_key
, type
, flags
);
281 os
->add_output_section_data(posd
);
284 // Map section flags to segment flags.
287 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags
)
289 elfcpp::Elf_Word ret
= elfcpp::PF_R
;
290 if ((flags
& elfcpp::SHF_WRITE
) != 0)
292 if ((flags
& elfcpp::SHF_EXECINSTR
) != 0)
297 // Make a new Output_section, and attach it to segments as
301 Layout::make_output_section(const char* name
, elfcpp::Elf_Word type
,
302 elfcpp::Elf_Xword flags
)
304 Output_section
* os
= new Output_section(name
, type
, flags
);
305 this->section_list_
.push_back(os
);
307 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
308 this->unattached_section_list_
.push_back(os
);
311 // This output section goes into a PT_LOAD segment.
313 elfcpp::Elf_Word seg_flags
= Layout::section_flags_to_segment(flags
);
315 // The only thing we really care about for PT_LOAD segments is
316 // whether or not they are writable, so that is how we search
317 // for them. People who need segments sorted on some other
318 // basis will have to wait until we implement a mechanism for
319 // them to describe the segments they want.
321 Segment_list::const_iterator p
;
322 for (p
= this->segment_list_
.begin();
323 p
!= this->segment_list_
.end();
326 if ((*p
)->type() == elfcpp::PT_LOAD
327 && ((*p
)->flags() & elfcpp::PF_W
) == (seg_flags
& elfcpp::PF_W
))
329 (*p
)->add_output_section(os
, seg_flags
);
334 if (p
== this->segment_list_
.end())
336 Output_segment
* oseg
= new Output_segment(elfcpp::PT_LOAD
,
338 this->segment_list_
.push_back(oseg
);
339 oseg
->add_output_section(os
, seg_flags
);
342 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
344 if (type
== elfcpp::SHT_NOTE
)
346 // See if we already have an equivalent PT_NOTE segment.
347 for (p
= this->segment_list_
.begin();
348 p
!= segment_list_
.end();
351 if ((*p
)->type() == elfcpp::PT_NOTE
352 && (((*p
)->flags() & elfcpp::PF_W
)
353 == (seg_flags
& elfcpp::PF_W
)))
355 (*p
)->add_output_section(os
, seg_flags
);
360 if (p
== this->segment_list_
.end())
362 Output_segment
* oseg
= new Output_segment(elfcpp::PT_NOTE
,
364 this->segment_list_
.push_back(oseg
);
365 oseg
->add_output_section(os
, seg_flags
);
369 // If we see a loadable SHF_TLS section, we create a PT_TLS
370 // segment. There can only be one such segment.
371 if ((flags
& elfcpp::SHF_TLS
) != 0)
373 if (this->tls_segment_
== NULL
)
375 this->tls_segment_
= new Output_segment(elfcpp::PT_TLS
,
377 this->segment_list_
.push_back(this->tls_segment_
);
379 this->tls_segment_
->add_output_section(os
, seg_flags
);
386 // Create the dynamic sections which are needed before we read the
390 Layout::create_initial_dynamic_sections(const Input_objects
* input_objects
,
391 Symbol_table
* symtab
)
393 if (!input_objects
->any_dynamic())
396 const char* dynamic_name
= this->namepool_
.add(".dynamic", NULL
);
397 this->dynamic_section_
= this->make_output_section(dynamic_name
,
400 | elfcpp::SHF_WRITE
));
402 symtab
->define_in_output_data(input_objects
->target(), "_DYNAMIC", NULL
,
403 this->dynamic_section_
, 0, 0,
404 elfcpp::STT_OBJECT
, elfcpp::STB_LOCAL
,
405 elfcpp::STV_HIDDEN
, 0, false, false);
407 this->dynamic_data_
= new Output_data_dynamic(&this->dynpool_
);
409 this->dynamic_section_
->add_output_section_data(this->dynamic_data_
);
412 // For each output section whose name can be represented as C symbol,
413 // define __start and __stop symbols for the section. This is a GNU
417 Layout::define_section_symbols(Symbol_table
* symtab
, const Target
* target
)
419 for (Section_list::const_iterator p
= this->section_list_
.begin();
420 p
!= this->section_list_
.end();
423 const char* const name
= (*p
)->name();
424 if (name
[strspn(name
,
426 "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
427 "abcdefghijklmnopqrstuvwxyz"
431 const std::string
name_string(name
);
432 const std::string
start_name("__start_" + name_string
);
433 const std::string
stop_name("__stop_" + name_string
);
435 symtab
->define_in_output_data(target
,
445 false, // offset_is_from_end
446 false); // only_if_ref
448 symtab
->define_in_output_data(target
,
458 true, // offset_is_from_end
459 false); // only_if_ref
464 // Find the first read-only PT_LOAD segment, creating one if
468 Layout::find_first_load_seg()
470 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
471 p
!= this->segment_list_
.end();
474 if ((*p
)->type() == elfcpp::PT_LOAD
475 && ((*p
)->flags() & elfcpp::PF_R
) != 0
476 && ((*p
)->flags() & elfcpp::PF_W
) == 0)
480 Output_segment
* load_seg
= new Output_segment(elfcpp::PT_LOAD
, elfcpp::PF_R
);
481 this->segment_list_
.push_back(load_seg
);
485 // Finalize the layout. When this is called, we have created all the
486 // output sections and all the output segments which are based on
487 // input sections. We have several things to do, and we have to do
488 // them in the right order, so that we get the right results correctly
491 // 1) Finalize the list of output segments and create the segment
494 // 2) Finalize the dynamic symbol table and associated sections.
496 // 3) Determine the final file offset of all the output segments.
498 // 4) Determine the final file offset of all the SHF_ALLOC output
501 // 5) Create the symbol table sections and the section name table
504 // 6) Finalize the symbol table: set symbol values to their final
505 // value and make a final determination of which symbols are going
506 // into the output symbol table.
508 // 7) Create the section table header.
510 // 8) Determine the final file offset of all the output sections which
511 // are not SHF_ALLOC, including the section table header.
513 // 9) Finalize the ELF file header.
515 // This function returns the size of the output file.
518 Layout::finalize(const Input_objects
* input_objects
, Symbol_table
* symtab
)
520 Target
* const target
= input_objects
->target();
522 target
->finalize_sections(this);
524 this->create_note_section();
526 Output_segment
* phdr_seg
= NULL
;
527 if (input_objects
->any_dynamic())
529 // There was a dynamic object in the link. We need to create
530 // some information for the dynamic linker.
532 // Create the PT_PHDR segment which will hold the program
534 phdr_seg
= new Output_segment(elfcpp::PT_PHDR
, elfcpp::PF_R
);
535 this->segment_list_
.push_back(phdr_seg
);
537 // Create the dynamic symbol table, including the hash table.
538 Output_section
* dynstr
;
539 std::vector
<Symbol
*> dynamic_symbols
;
540 unsigned int local_dynamic_count
;
542 this->create_dynamic_symtab(target
, symtab
, &dynstr
,
543 &local_dynamic_count
, &dynamic_symbols
,
546 // Create the .interp section to hold the name of the
547 // interpreter, and put it in a PT_INTERP segment.
548 this->create_interp(target
);
550 // Finish the .dynamic section to hold the dynamic data, and put
551 // it in a PT_DYNAMIC segment.
552 this->finish_dynamic_section(input_objects
, symtab
);
554 // We should have added everything we need to the dynamic string
556 this->dynpool_
.set_string_offsets();
558 // Create the version sections. We can't do this until the
559 // dynamic string table is complete.
560 this->create_version_sections(&versions
, local_dynamic_count
,
561 dynamic_symbols
, dynstr
);
564 // FIXME: Handle PT_GNU_STACK.
566 Output_segment
* load_seg
= this->find_first_load_seg();
568 // Lay out the segment headers.
569 Output_segment_headers
* segment_headers
;
570 segment_headers
= new Output_segment_headers(this->segment_list_
);
571 load_seg
->add_initial_output_data(segment_headers
);
572 this->special_output_list_
.push_back(segment_headers
);
573 if (phdr_seg
!= NULL
)
574 phdr_seg
->add_initial_output_data(segment_headers
);
576 // Lay out the file header.
577 Output_file_header
* file_header
;
578 file_header
= new Output_file_header(target
, symtab
, segment_headers
);
579 load_seg
->add_initial_output_data(file_header
);
580 this->special_output_list_
.push_back(file_header
);
582 // We set the output section indexes in set_segment_offsets and
583 // set_section_offsets.
584 unsigned int shndx
= 1;
586 // Set the file offsets of all the segments, and all the sections
588 off_t off
= this->set_segment_offsets(target
, load_seg
, &shndx
);
590 // Create the symbol table sections.
591 this->create_symtab_sections(input_objects
, symtab
, &off
);
593 // Create the .shstrtab section.
594 Output_section
* shstrtab_section
= this->create_shstrtab();
596 // Set the file offsets of all the sections not associated with
598 off
= this->set_section_offsets(off
, &shndx
);
600 // Create the section table header.
601 Output_section_headers
* oshdrs
= this->create_shdrs(&off
);
603 file_header
->set_section_info(oshdrs
, shstrtab_section
);
605 // Now we know exactly where everything goes in the output file.
606 Output_data::layout_complete();
611 // Create a .note section for an executable or shared library. This
612 // records the version of gold used to create the binary.
615 Layout::create_note_section()
617 if (parameters
->output_is_object())
620 const int size
= parameters
->get_size();
622 // The contents of the .note section.
623 const char* name
= "GNU";
624 std::string
desc(std::string("gold ") + gold::get_version_string());
625 size_t namesz
= strlen(name
) + 1;
626 size_t aligned_namesz
= align_address(namesz
, size
/ 8);
627 size_t descsz
= desc
.length() + 1;
628 size_t aligned_descsz
= align_address(descsz
, size
/ 8);
629 const int note_type
= 4;
631 size_t notesz
= 3 * (size
/ 8) + aligned_namesz
+ aligned_descsz
;
633 unsigned char buffer
[128];
634 gold_assert(sizeof buffer
>= notesz
);
635 memset(buffer
, 0, notesz
);
637 bool is_big_endian
= parameters
->is_big_endian();
643 elfcpp::Swap
<32, false>::writeval(buffer
, namesz
);
644 elfcpp::Swap
<32, false>::writeval(buffer
+ 4, descsz
);
645 elfcpp::Swap
<32, false>::writeval(buffer
+ 8, note_type
);
649 elfcpp::Swap
<32, true>::writeval(buffer
, namesz
);
650 elfcpp::Swap
<32, true>::writeval(buffer
+ 4, descsz
);
651 elfcpp::Swap
<32, true>::writeval(buffer
+ 8, note_type
);
658 elfcpp::Swap
<64, false>::writeval(buffer
, namesz
);
659 elfcpp::Swap
<64, false>::writeval(buffer
+ 8, descsz
);
660 elfcpp::Swap
<64, false>::writeval(buffer
+ 16, note_type
);
664 elfcpp::Swap
<64, true>::writeval(buffer
, namesz
);
665 elfcpp::Swap
<64, true>::writeval(buffer
+ 8, descsz
);
666 elfcpp::Swap
<64, true>::writeval(buffer
+ 16, note_type
);
672 memcpy(buffer
+ 3 * (size
/ 8), name
, namesz
);
673 memcpy(buffer
+ 3 * (size
/ 8) + aligned_namesz
, desc
.data(), descsz
);
675 const char* note_name
= this->namepool_
.add(".note", NULL
);
676 Output_section
* os
= this->make_output_section(note_name
,
679 Output_section_data
* posd
= new Output_data_const(buffer
, notesz
,
681 os
->add_output_section_data(posd
);
684 // Return whether SEG1 should be before SEG2 in the output file. This
685 // is based entirely on the segment type and flags. When this is
686 // called the segment addresses has normally not yet been set.
689 Layout::segment_precedes(const Output_segment
* seg1
,
690 const Output_segment
* seg2
)
692 elfcpp::Elf_Word type1
= seg1
->type();
693 elfcpp::Elf_Word type2
= seg2
->type();
695 // The single PT_PHDR segment is required to precede any loadable
696 // segment. We simply make it always first.
697 if (type1
== elfcpp::PT_PHDR
)
699 gold_assert(type2
!= elfcpp::PT_PHDR
);
702 if (type2
== elfcpp::PT_PHDR
)
705 // The single PT_INTERP segment is required to precede any loadable
706 // segment. We simply make it always second.
707 if (type1
== elfcpp::PT_INTERP
)
709 gold_assert(type2
!= elfcpp::PT_INTERP
);
712 if (type2
== elfcpp::PT_INTERP
)
715 // We then put PT_LOAD segments before any other segments.
716 if (type1
== elfcpp::PT_LOAD
&& type2
!= elfcpp::PT_LOAD
)
718 if (type2
== elfcpp::PT_LOAD
&& type1
!= elfcpp::PT_LOAD
)
721 // We put the PT_TLS segment last, because that is where the dynamic
722 // linker expects to find it (this is just for efficiency; other
723 // positions would also work correctly).
724 if (type1
== elfcpp::PT_TLS
&& type2
!= elfcpp::PT_TLS
)
726 if (type2
== elfcpp::PT_TLS
&& type1
!= elfcpp::PT_TLS
)
729 const elfcpp::Elf_Word flags1
= seg1
->flags();
730 const elfcpp::Elf_Word flags2
= seg2
->flags();
732 // The order of non-PT_LOAD segments is unimportant. We simply sort
733 // by the numeric segment type and flags values. There should not
734 // be more than one segment with the same type and flags.
735 if (type1
!= elfcpp::PT_LOAD
)
738 return type1
< type2
;
739 gold_assert(flags1
!= flags2
);
740 return flags1
< flags2
;
743 // We sort PT_LOAD segments based on the flags. Readonly segments
744 // come before writable segments. Then executable segments come
745 // before non-executable segments. Then the unlikely case of a
746 // non-readable segment comes before the normal case of a readable
747 // segment. If there are multiple segments with the same type and
748 // flags, we require that the address be set, and we sort by
749 // virtual address and then physical address.
750 if ((flags1
& elfcpp::PF_W
) != (flags2
& elfcpp::PF_W
))
751 return (flags1
& elfcpp::PF_W
) == 0;
752 if ((flags1
& elfcpp::PF_X
) != (flags2
& elfcpp::PF_X
))
753 return (flags1
& elfcpp::PF_X
) != 0;
754 if ((flags1
& elfcpp::PF_R
) != (flags2
& elfcpp::PF_R
))
755 return (flags1
& elfcpp::PF_R
) == 0;
757 uint64_t vaddr1
= seg1
->vaddr();
758 uint64_t vaddr2
= seg2
->vaddr();
759 if (vaddr1
!= vaddr2
)
760 return vaddr1
< vaddr2
;
762 uint64_t paddr1
= seg1
->paddr();
763 uint64_t paddr2
= seg2
->paddr();
764 gold_assert(paddr1
!= paddr2
);
765 return paddr1
< paddr2
;
768 // Set the file offsets of all the segments, and all the sections they
769 // contain. They have all been created. LOAD_SEG must be be laid out
770 // first. Return the offset of the data to follow.
773 Layout::set_segment_offsets(const Target
* target
, Output_segment
* load_seg
,
774 unsigned int *pshndx
)
776 // Sort them into the final order.
777 std::sort(this->segment_list_
.begin(), this->segment_list_
.end(),
778 Layout::Compare_segments());
780 // Find the PT_LOAD segments, and set their addresses and offsets
781 // and their section's addresses and offsets.
782 uint64_t addr
= target
->text_segment_address();
784 bool was_readonly
= false;
785 for (Segment_list::iterator p
= this->segment_list_
.begin();
786 p
!= this->segment_list_
.end();
789 if ((*p
)->type() == elfcpp::PT_LOAD
)
791 if (load_seg
!= NULL
&& load_seg
!= *p
)
795 // If the last segment was readonly, and this one is not,
796 // then skip the address forward one page, maintaining the
797 // same position within the page. This lets us store both
798 // segments overlapping on a single page in the file, but
799 // the loader will put them on different pages in memory.
801 uint64_t orig_addr
= addr
;
802 uint64_t orig_off
= off
;
804 uint64_t aligned_addr
= addr
;
805 uint64_t abi_pagesize
= target
->abi_pagesize();
807 // FIXME: This should depend on the -n and -N options.
808 (*p
)->set_minimum_addralign(target
->common_pagesize());
810 if (was_readonly
&& ((*p
)->flags() & elfcpp::PF_W
) != 0)
812 uint64_t align
= (*p
)->addralign();
814 addr
= align_address(addr
, align
);
816 if ((addr
& (abi_pagesize
- 1)) != 0)
817 addr
= addr
+ abi_pagesize
;
820 unsigned int shndx_hold
= *pshndx
;
821 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
822 uint64_t new_addr
= (*p
)->set_section_addresses(addr
, &off
, pshndx
);
824 // Now that we know the size of this segment, we may be able
825 // to save a page in memory, at the cost of wasting some
826 // file space, by instead aligning to the start of a new
827 // page. Here we use the real machine page size rather than
828 // the ABI mandated page size.
830 if (aligned_addr
!= addr
)
832 uint64_t common_pagesize
= target
->common_pagesize();
833 uint64_t first_off
= (common_pagesize
835 & (common_pagesize
- 1)));
836 uint64_t last_off
= new_addr
& (common_pagesize
- 1);
839 && ((aligned_addr
& ~ (common_pagesize
- 1))
840 != (new_addr
& ~ (common_pagesize
- 1)))
841 && first_off
+ last_off
<= common_pagesize
)
843 *pshndx
= shndx_hold
;
844 addr
= align_address(aligned_addr
, common_pagesize
);
845 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
846 new_addr
= (*p
)->set_section_addresses(addr
, &off
, pshndx
);
852 if (((*p
)->flags() & elfcpp::PF_W
) == 0)
857 // Handle the non-PT_LOAD segments, setting their offsets from their
858 // section's offsets.
859 for (Segment_list::iterator p
= this->segment_list_
.begin();
860 p
!= this->segment_list_
.end();
863 if ((*p
)->type() != elfcpp::PT_LOAD
)
870 // Set the file offset of all the sections not associated with a
874 Layout::set_section_offsets(off_t off
, unsigned int* pshndx
)
876 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
877 p
!= this->unattached_section_list_
.end();
880 (*p
)->set_out_shndx(*pshndx
);
882 if ((*p
)->offset() != -1)
884 off
= align_address(off
, (*p
)->addralign());
885 (*p
)->set_address(0, off
);
886 off
+= (*p
)->data_size();
891 // Create the symbol table sections. Here we also set the final
892 // values of the symbols. At this point all the loadable sections are
896 Layout::create_symtab_sections(const Input_objects
* input_objects
,
897 Symbol_table
* symtab
,
902 if (parameters
->get_size() == 32)
904 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
907 else if (parameters
->get_size() == 64)
909 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
916 off
= align_address(off
, align
);
917 off_t startoff
= off
;
919 // Save space for the dummy symbol at the start of the section. We
920 // never bother to write this out--it will just be left as zero.
922 unsigned int local_symbol_index
= 1;
924 // Add STT_SECTION symbols for each Output section which needs one.
925 for (Section_list::iterator p
= this->section_list_
.begin();
926 p
!= this->section_list_
.end();
929 if (!(*p
)->needs_symtab_index())
930 (*p
)->set_symtab_index(-1U);
933 (*p
)->set_symtab_index(local_symbol_index
);
934 ++local_symbol_index
;
939 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
940 p
!= input_objects
->relobj_end();
943 Task_lock_obj
<Object
> tlo(**p
);
944 unsigned int index
= (*p
)->finalize_local_symbols(local_symbol_index
,
947 off
+= (index
- local_symbol_index
) * symsize
;
948 local_symbol_index
= index
;
951 unsigned int local_symcount
= local_symbol_index
;
952 gold_assert(local_symcount
* symsize
== off
- startoff
);
955 size_t dyn_global_index
;
957 if (this->dynsym_section_
== NULL
)
960 dyn_global_index
= 0;
965 dyn_global_index
= this->dynsym_section_
->info();
966 off_t locsize
= dyn_global_index
* this->dynsym_section_
->entsize();
967 dynoff
= this->dynsym_section_
->offset() + locsize
;
968 dyncount
= (this->dynsym_section_
->data_size() - locsize
) / symsize
;
969 gold_assert(static_cast<off_t
>(dyncount
* symsize
)
970 == this->dynsym_section_
->data_size() - locsize
);
973 off
= symtab
->finalize(local_symcount
, off
, dynoff
, dyn_global_index
,
974 dyncount
, &this->sympool_
);
976 this->sympool_
.set_string_offsets();
978 const char* symtab_name
= this->namepool_
.add(".symtab", NULL
);
979 Output_section
* osymtab
= this->make_output_section(symtab_name
,
982 this->symtab_section_
= osymtab
;
984 Output_section_data
* pos
= new Output_data_space(off
- startoff
,
986 osymtab
->add_output_section_data(pos
);
988 const char* strtab_name
= this->namepool_
.add(".strtab", NULL
);
989 Output_section
* ostrtab
= this->make_output_section(strtab_name
,
993 Output_section_data
* pstr
= new Output_data_strtab(&this->sympool_
);
994 ostrtab
->add_output_section_data(pstr
);
996 osymtab
->set_address(0, startoff
);
997 osymtab
->set_link_section(ostrtab
);
998 osymtab
->set_info(local_symcount
);
999 osymtab
->set_entsize(symsize
);
1004 // Create the .shstrtab section, which holds the names of the
1005 // sections. At the time this is called, we have created all the
1006 // output sections except .shstrtab itself.
1009 Layout::create_shstrtab()
1011 // FIXME: We don't need to create a .shstrtab section if we are
1012 // stripping everything.
1014 const char* name
= this->namepool_
.add(".shstrtab", NULL
);
1016 this->namepool_
.set_string_offsets();
1018 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_STRTAB
, 0);
1020 Output_section_data
* posd
= new Output_data_strtab(&this->namepool_
);
1021 os
->add_output_section_data(posd
);
1026 // Create the section headers. SIZE is 32 or 64. OFF is the file
1029 Output_section_headers
*
1030 Layout::create_shdrs(off_t
* poff
)
1032 Output_section_headers
* oshdrs
;
1033 oshdrs
= new Output_section_headers(this,
1034 &this->segment_list_
,
1035 &this->unattached_section_list_
,
1037 off_t off
= align_address(*poff
, oshdrs
->addralign());
1038 oshdrs
->set_address(0, off
);
1039 off
+= oshdrs
->data_size();
1041 this->special_output_list_
.push_back(oshdrs
);
1045 // Create the dynamic symbol table.
1048 Layout::create_dynamic_symtab(const Target
* target
, Symbol_table
* symtab
,
1049 Output_section
**pdynstr
,
1050 unsigned int* plocal_dynamic_count
,
1051 std::vector
<Symbol
*>* pdynamic_symbols
,
1052 Versions
* pversions
)
1054 // Count all the symbols in the dynamic symbol table, and set the
1055 // dynamic symbol indexes.
1057 // Skip symbol 0, which is always all zeroes.
1058 unsigned int index
= 1;
1060 // Add STT_SECTION symbols for each Output section which needs one.
1061 for (Section_list::iterator p
= this->section_list_
.begin();
1062 p
!= this->section_list_
.end();
1065 if (!(*p
)->needs_dynsym_index())
1066 (*p
)->set_dynsym_index(-1U);
1069 (*p
)->set_dynsym_index(index
);
1074 // FIXME: Some targets apparently require local symbols in the
1075 // dynamic symbol table. Here is where we will have to count them,
1076 // and set the dynamic symbol indexes, and add the names to
1079 unsigned int local_symcount
= index
;
1080 *plocal_dynamic_count
= local_symcount
;
1082 // FIXME: We have to tell set_dynsym_indexes whether the
1083 // -E/--export-dynamic option was used.
1084 index
= symtab
->set_dynsym_indexes(&this->options_
, target
, index
,
1085 pdynamic_symbols
, &this->dynpool_
,
1090 const int size
= parameters
->get_size();
1093 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
1096 else if (size
== 64)
1098 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
1104 // Create the dynamic symbol table section.
1106 const char* dynsym_name
= this->namepool_
.add(".dynsym", NULL
);
1107 Output_section
* dynsym
= this->make_output_section(dynsym_name
,
1111 Output_section_data
* odata
= new Output_data_space(index
* symsize
,
1113 dynsym
->add_output_section_data(odata
);
1115 dynsym
->set_info(local_symcount
);
1116 dynsym
->set_entsize(symsize
);
1117 dynsym
->set_addralign(align
);
1119 this->dynsym_section_
= dynsym
;
1121 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1122 odyn
->add_section_address(elfcpp::DT_SYMTAB
, dynsym
);
1123 odyn
->add_constant(elfcpp::DT_SYMENT
, symsize
);
1125 // Create the dynamic string table section.
1127 const char* dynstr_name
= this->namepool_
.add(".dynstr", NULL
);
1128 Output_section
* dynstr
= this->make_output_section(dynstr_name
,
1132 Output_section_data
* strdata
= new Output_data_strtab(&this->dynpool_
);
1133 dynstr
->add_output_section_data(strdata
);
1135 dynsym
->set_link_section(dynstr
);
1136 this->dynamic_section_
->set_link_section(dynstr
);
1138 odyn
->add_section_address(elfcpp::DT_STRTAB
, dynstr
);
1139 odyn
->add_section_size(elfcpp::DT_STRSZ
, dynstr
);
1143 // Create the hash tables.
1145 // FIXME: We need an option to create a GNU hash table.
1147 unsigned char* phash
;
1148 unsigned int hashlen
;
1149 Dynobj::create_elf_hash_table(*pdynamic_symbols
, local_symcount
,
1152 const char* hash_name
= this->namepool_
.add(".hash", NULL
);
1153 Output_section
* hashsec
= this->make_output_section(hash_name
,
1157 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
1160 hashsec
->add_output_section_data(hashdata
);
1162 hashsec
->set_link_section(dynsym
);
1163 hashsec
->set_entsize(4);
1165 odyn
->add_section_address(elfcpp::DT_HASH
, hashsec
);
1168 // Create the version sections.
1171 Layout::create_version_sections(const Versions
* versions
,
1172 unsigned int local_symcount
,
1173 const std::vector
<Symbol
*>& dynamic_symbols
,
1174 const Output_section
* dynstr
)
1176 if (!versions
->any_defs() && !versions
->any_needs())
1179 if (parameters
->get_size() == 32)
1181 if (parameters
->is_big_endian())
1183 #ifdef HAVE_TARGET_32_BIG
1184 this->sized_create_version_sections
1185 SELECT_SIZE_ENDIAN_NAME(32, true)(
1186 versions
, local_symcount
, dynamic_symbols
, dynstr
1187 SELECT_SIZE_ENDIAN(32, true));
1194 #ifdef HAVE_TARGET_32_LITTLE
1195 this->sized_create_version_sections
1196 SELECT_SIZE_ENDIAN_NAME(32, false)(
1197 versions
, local_symcount
, dynamic_symbols
, dynstr
1198 SELECT_SIZE_ENDIAN(32, false));
1204 else if (parameters
->get_size() == 64)
1206 if (parameters
->is_big_endian())
1208 #ifdef HAVE_TARGET_64_BIG
1209 this->sized_create_version_sections
1210 SELECT_SIZE_ENDIAN_NAME(64, true)(
1211 versions
, local_symcount
, dynamic_symbols
, dynstr
1212 SELECT_SIZE_ENDIAN(64, true));
1219 #ifdef HAVE_TARGET_64_LITTLE
1220 this->sized_create_version_sections
1221 SELECT_SIZE_ENDIAN_NAME(64, false)(
1222 versions
, local_symcount
, dynamic_symbols
, dynstr
1223 SELECT_SIZE_ENDIAN(64, false));
1233 // Create the version sections, sized version.
1235 template<int size
, bool big_endian
>
1237 Layout::sized_create_version_sections(
1238 const Versions
* versions
,
1239 unsigned int local_symcount
,
1240 const std::vector
<Symbol
*>& dynamic_symbols
,
1241 const Output_section
* dynstr
1244 const char* vname
= this->namepool_
.add(".gnu.version", NULL
);
1245 Output_section
* vsec
= this->make_output_section(vname
,
1246 elfcpp::SHT_GNU_versym
,
1249 unsigned char* vbuf
;
1251 versions
->symbol_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1252 &this->dynpool_
, local_symcount
, dynamic_symbols
, &vbuf
, &vsize
1253 SELECT_SIZE_ENDIAN(size
, big_endian
));
1255 Output_section_data
* vdata
= new Output_data_const_buffer(vbuf
, vsize
, 2);
1257 vsec
->add_output_section_data(vdata
);
1258 vsec
->set_entsize(2);
1259 vsec
->set_link_section(this->dynsym_section_
);
1261 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1262 odyn
->add_section_address(elfcpp::DT_VERSYM
, vsec
);
1264 if (versions
->any_defs())
1266 const char* vdname
= this->namepool_
.add(".gnu.version_d", NULL
);
1267 Output_section
*vdsec
;
1268 vdsec
= this->make_output_section(vdname
, elfcpp::SHT_GNU_verdef
,
1271 unsigned char* vdbuf
;
1272 unsigned int vdsize
;
1273 unsigned int vdentries
;
1274 versions
->def_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1275 &this->dynpool_
, &vdbuf
, &vdsize
, &vdentries
1276 SELECT_SIZE_ENDIAN(size
, big_endian
));
1278 Output_section_data
* vddata
= new Output_data_const_buffer(vdbuf
,
1282 vdsec
->add_output_section_data(vddata
);
1283 vdsec
->set_link_section(dynstr
);
1284 vdsec
->set_info(vdentries
);
1286 odyn
->add_section_address(elfcpp::DT_VERDEF
, vdsec
);
1287 odyn
->add_constant(elfcpp::DT_VERDEFNUM
, vdentries
);
1290 if (versions
->any_needs())
1292 const char* vnname
= this->namepool_
.add(".gnu.version_r", NULL
);
1293 Output_section
* vnsec
;
1294 vnsec
= this->make_output_section(vnname
, elfcpp::SHT_GNU_verneed
,
1297 unsigned char* vnbuf
;
1298 unsigned int vnsize
;
1299 unsigned int vnentries
;
1300 versions
->need_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)
1301 (&this->dynpool_
, &vnbuf
, &vnsize
, &vnentries
1302 SELECT_SIZE_ENDIAN(size
, big_endian
));
1304 Output_section_data
* vndata
= new Output_data_const_buffer(vnbuf
,
1308 vnsec
->add_output_section_data(vndata
);
1309 vnsec
->set_link_section(dynstr
);
1310 vnsec
->set_info(vnentries
);
1312 odyn
->add_section_address(elfcpp::DT_VERNEED
, vnsec
);
1313 odyn
->add_constant(elfcpp::DT_VERNEEDNUM
, vnentries
);
1317 // Create the .interp section and PT_INTERP segment.
1320 Layout::create_interp(const Target
* target
)
1322 const char* interp
= this->options_
.dynamic_linker();
1325 interp
= target
->dynamic_linker();
1326 gold_assert(interp
!= NULL
);
1329 size_t len
= strlen(interp
) + 1;
1331 Output_section_data
* odata
= new Output_data_const(interp
, len
, 1);
1333 const char* interp_name
= this->namepool_
.add(".interp", NULL
);
1334 Output_section
* osec
= this->make_output_section(interp_name
,
1335 elfcpp::SHT_PROGBITS
,
1337 osec
->add_output_section_data(odata
);
1339 Output_segment
* oseg
= new Output_segment(elfcpp::PT_INTERP
, elfcpp::PF_R
);
1340 this->segment_list_
.push_back(oseg
);
1341 oseg
->add_initial_output_section(osec
, elfcpp::PF_R
);
1344 // Finish the .dynamic section and PT_DYNAMIC segment.
1347 Layout::finish_dynamic_section(const Input_objects
* input_objects
,
1348 const Symbol_table
* symtab
)
1350 Output_segment
* oseg
= new Output_segment(elfcpp::PT_DYNAMIC
,
1351 elfcpp::PF_R
| elfcpp::PF_W
);
1352 this->segment_list_
.push_back(oseg
);
1353 oseg
->add_initial_output_section(this->dynamic_section_
,
1354 elfcpp::PF_R
| elfcpp::PF_W
);
1356 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1358 for (Input_objects::Dynobj_iterator p
= input_objects
->dynobj_begin();
1359 p
!= input_objects
->dynobj_end();
1362 // FIXME: Handle --as-needed.
1363 odyn
->add_string(elfcpp::DT_NEEDED
, (*p
)->soname());
1366 // FIXME: Support --init and --fini.
1367 Symbol
* sym
= symtab
->lookup("_init");
1368 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
1369 odyn
->add_symbol(elfcpp::DT_INIT
, sym
);
1371 sym
= symtab
->lookup("_fini");
1372 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
1373 odyn
->add_symbol(elfcpp::DT_FINI
, sym
);
1375 // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY.
1377 // Add a DT_RPATH entry if needed.
1378 const General_options::Dir_list
& rpath(this->options_
.rpath());
1381 std::string rpath_val
;
1382 for (General_options::Dir_list::const_iterator p
= rpath
.begin();
1386 if (rpath_val
.empty())
1387 rpath_val
= p
->name();
1390 // Eliminate duplicates.
1391 General_options::Dir_list::const_iterator q
;
1392 for (q
= rpath
.begin(); q
!= p
; ++q
)
1393 if (q
->name() == p
->name())
1398 rpath_val
+= p
->name();
1403 odyn
->add_string(elfcpp::DT_RPATH
, rpath_val
);
1407 // The mapping of .gnu.linkonce section names to real section names.
1409 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
1410 const Layout::Linkonce_mapping
Layout::linkonce_mapping
[] =
1412 MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
1413 MAPPING_INIT("t", ".text"),
1414 MAPPING_INIT("r", ".rodata"),
1415 MAPPING_INIT("d", ".data"),
1416 MAPPING_INIT("b", ".bss"),
1417 MAPPING_INIT("s", ".sdata"),
1418 MAPPING_INIT("sb", ".sbss"),
1419 MAPPING_INIT("s2", ".sdata2"),
1420 MAPPING_INIT("sb2", ".sbss2"),
1421 MAPPING_INIT("wi", ".debug_info"),
1422 MAPPING_INIT("td", ".tdata"),
1423 MAPPING_INIT("tb", ".tbss"),
1424 MAPPING_INIT("lr", ".lrodata"),
1425 MAPPING_INIT("l", ".ldata"),
1426 MAPPING_INIT("lb", ".lbss"),
1430 const int Layout::linkonce_mapping_count
=
1431 sizeof(Layout::linkonce_mapping
) / sizeof(Layout::linkonce_mapping
[0]);
1433 // Return the name of the output section to use for a .gnu.linkonce
1434 // section. This is based on the default ELF linker script of the old
1435 // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
1436 // to ".text". Set *PLEN to the length of the name. *PLEN is
1437 // initialized to the length of NAME.
1440 Layout::linkonce_output_name(const char* name
, size_t *plen
)
1442 const char* s
= name
+ sizeof(".gnu.linkonce") - 1;
1446 const Linkonce_mapping
* plm
= linkonce_mapping
;
1447 for (int i
= 0; i
< linkonce_mapping_count
; ++i
, ++plm
)
1449 if (strncmp(s
, plm
->from
, plm
->fromlen
) == 0 && s
[plm
->fromlen
] == '.')
1458 // Choose the output section name to use given an input section name.
1459 // Set *PLEN to the length of the name. *PLEN is initialized to the
1463 Layout::output_section_name(const char* name
, size_t* plen
)
1465 if (Layout::is_linkonce(name
))
1467 // .gnu.linkonce sections are laid out as though they were named
1468 // for the sections are placed into.
1469 return Layout::linkonce_output_name(name
, plen
);
1472 // If the section name has no '.', or only an initial '.', we use
1473 // the name unchanged (i.e., ".text" is unchanged).
1475 // Otherwise, if the section name does not include ".rel", we drop
1476 // the last '.' and everything that follows (i.e., ".text.XXX"
1477 // becomes ".text").
1479 // Otherwise, if the section name has zero or one '.' after the
1480 // ".rel", we use the name unchanged (i.e., ".rel.text" is
1483 // Otherwise, we drop the last '.' and everything that follows
1484 // (i.e., ".rel.text.XXX" becomes ".rel.text").
1486 const char* s
= name
;
1489 const char* sdot
= strchr(s
, '.');
1493 const char* srel
= strstr(s
, ".rel");
1496 *plen
= sdot
- name
;
1500 sdot
= strchr(srel
+ 1, '.');
1503 sdot
= strchr(sdot
+ 1, '.');
1507 *plen
= sdot
- name
;
1511 // Record the signature of a comdat section, and return whether to
1512 // include it in the link. If GROUP is true, this is a regular
1513 // section group. If GROUP is false, this is a group signature
1514 // derived from the name of a linkonce section. We want linkonce
1515 // signatures and group signatures to block each other, but we don't
1516 // want a linkonce signature to block another linkonce signature.
1519 Layout::add_comdat(const char* signature
, bool group
)
1521 std::string
sig(signature
);
1522 std::pair
<Signatures::iterator
, bool> ins(
1523 this->signatures_
.insert(std::make_pair(sig
, group
)));
1527 // This is the first time we've seen this signature.
1531 if (ins
.first
->second
)
1533 // We've already seen a real section group with this signature.
1538 // This is a real section group, and we've already seen a
1539 // linkonce section with this signature. Record that we've seen
1540 // a section group, and don't include this section group.
1541 ins
.first
->second
= true;
1546 // We've already seen a linkonce section and this is a linkonce
1547 // section. These don't block each other--this may be the same
1548 // symbol name with different section types.
1553 // Write out data not associated with a section or the symbol table.
1556 Layout::write_data(const Symbol_table
* symtab
, Output_file
* of
) const
1558 const Output_section
* symtab_section
= this->symtab_section_
;
1559 for (Section_list::const_iterator p
= this->section_list_
.begin();
1560 p
!= this->section_list_
.end();
1563 if ((*p
)->needs_symtab_index())
1565 gold_assert(symtab_section
!= NULL
);
1566 unsigned int index
= (*p
)->symtab_index();
1567 gold_assert(index
> 0 && index
!= -1U);
1568 off_t off
= (symtab_section
->offset()
1569 + index
* symtab_section
->entsize());
1570 symtab
->write_section_symbol(*p
, of
, off
);
1574 const Output_section
* dynsym_section
= this->dynsym_section_
;
1575 for (Section_list::const_iterator p
= this->section_list_
.begin();
1576 p
!= this->section_list_
.end();
1579 if ((*p
)->needs_dynsym_index())
1581 gold_assert(dynsym_section
!= NULL
);
1582 unsigned int index
= (*p
)->dynsym_index();
1583 gold_assert(index
> 0 && index
!= -1U);
1584 off_t off
= (dynsym_section
->offset()
1585 + index
* dynsym_section
->entsize());
1586 symtab
->write_section_symbol(*p
, of
, off
);
1590 // Write out the Output_sections. Most won't have anything to
1591 // write, since most of the data will come from input sections which
1592 // are handled elsewhere. But some Output_sections do have
1594 for (Section_list::const_iterator p
= this->section_list_
.begin();
1595 p
!= this->section_list_
.end();
1599 // Write out the Output_data which are not in an Output_section.
1600 for (Data_list::const_iterator p
= this->special_output_list_
.begin();
1601 p
!= this->special_output_list_
.end();
1606 // Write_data_task methods.
1608 // We can always run this task.
1610 Task::Is_runnable_type
1611 Write_data_task::is_runnable(Workqueue
*)
1616 // We need to unlock FINAL_BLOCKER when finished.
1619 Write_data_task::locks(Workqueue
* workqueue
)
1621 return new Task_locker_block(*this->final_blocker_
, workqueue
);
1624 // Run the task--write out the data.
1627 Write_data_task::run(Workqueue
*)
1629 this->layout_
->write_data(this->symtab_
, this->of_
);
1632 // Write_symbols_task methods.
1634 // We can always run this task.
1636 Task::Is_runnable_type
1637 Write_symbols_task::is_runnable(Workqueue
*)
1642 // We need to unlock FINAL_BLOCKER when finished.
1645 Write_symbols_task::locks(Workqueue
* workqueue
)
1647 return new Task_locker_block(*this->final_blocker_
, workqueue
);
1650 // Run the task--write out the symbols.
1653 Write_symbols_task::run(Workqueue
*)
1655 this->symtab_
->write_globals(this->target_
, this->sympool_
, this->dynpool_
,
1659 // Close_task_runner methods.
1661 // Run the task--close the file.
1664 Close_task_runner::run(Workqueue
*)
1669 // Instantiate the templates we need. We could use the configure
1670 // script to restrict this to only the ones for implemented targets.
1672 #ifdef HAVE_TARGET_32_LITTLE
1675 Layout::layout
<32, false>(Relobj
* object
, unsigned int shndx
, const char* name
,
1676 const elfcpp::Shdr
<32, false>& shdr
, off_t
*);
1679 #ifdef HAVE_TARGET_32_BIG
1682 Layout::layout
<32, true>(Relobj
* object
, unsigned int shndx
, const char* name
,
1683 const elfcpp::Shdr
<32, true>& shdr
, off_t
*);
1686 #ifdef HAVE_TARGET_64_LITTLE
1689 Layout::layout
<64, false>(Relobj
* object
, unsigned int shndx
, const char* name
,
1690 const elfcpp::Shdr
<64, false>& shdr
, off_t
*);
1693 #ifdef HAVE_TARGET_64_BIG
1696 Layout::layout
<64, true>(Relobj
* object
, unsigned int shndx
, const char* name
,
1697 const elfcpp::Shdr
<64, true>& shdr
, off_t
*);
1701 } // End namespace gold.