1 // layout.cc -- lay out output file sections for gold
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
30 #include "parameters.h"
33 #include "script-sections.h"
38 #include "compressed_output.h"
44 // Layout_task_runner methods.
46 // Lay out the sections. This is called after all the input objects
50 Layout_task_runner::run(Workqueue
* workqueue
, const Task
* task
)
52 off_t file_size
= this->layout_
->finalize(this->input_objects_
,
56 // Now we know the final size of the output file and we know where
57 // each piece of information goes.
58 Output_file
* of
= new Output_file(parameters
->output_file_name());
61 // Queue up the final set of tasks.
62 gold::queue_final_tasks(this->options_
, this->input_objects_
,
63 this->symtab_
, this->layout_
, workqueue
, of
);
68 Layout::Layout(const General_options
& options
, Script_options
* script_options
)
69 : options_(options
), script_options_(script_options
), namepool_(),
70 sympool_(), dynpool_(), signatures_(),
71 section_name_map_(), segment_list_(), section_list_(),
72 unattached_section_list_(), special_output_list_(),
73 section_headers_(NULL
), tls_segment_(NULL
), symtab_section_(NULL
),
74 dynsym_section_(NULL
), dynamic_section_(NULL
), dynamic_data_(NULL
),
75 eh_frame_section_(NULL
), output_file_size_(-1),
76 input_requires_executable_stack_(false),
77 input_with_gnu_stack_note_(false),
78 input_without_gnu_stack_note_(false),
79 has_static_tls_(false),
80 any_postprocessing_sections_(false)
82 // Make space for more than enough segments for a typical file.
83 // This is just for efficiency--it's OK if we wind up needing more.
84 this->segment_list_
.reserve(12);
86 // We expect two unattached Output_data objects: the file header and
87 // the segment headers.
88 this->special_output_list_
.reserve(2);
91 // Hash a key we use to look up an output section mapping.
94 Layout::Hash_key::operator()(const Layout::Key
& k
) const
96 return k
.first
+ k
.second
.first
+ k
.second
.second
;
99 // Return whether PREFIX is a prefix of STR.
102 is_prefix_of(const char* prefix
, const char* str
)
104 return strncmp(prefix
, str
, strlen(prefix
)) == 0;
107 // Returns whether the given section is in the list of
108 // debug-sections-used-by-some-version-of-gdb. Currently,
109 // we've checked versions of gdb up to and including 6.7.1.
111 static const char* gdb_sections
[] =
113 // ".debug_aranges", // not used by gdb as of 6.7.1
119 // ".debug_pubnames", // not used by gdb as of 6.7.1
125 is_gdb_debug_section(const char* str
)
127 // We can do this faster: binary search or a hashtable. But why bother?
128 for (size_t i
= 0; i
< sizeof(gdb_sections
)/sizeof(*gdb_sections
); ++i
)
129 if (strcmp(str
, gdb_sections
[i
]) == 0)
134 // Whether to include this section in the link.
136 template<int size
, bool big_endian
>
138 Layout::include_section(Sized_relobj
<size
, big_endian
>*, const char* name
,
139 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
141 // Some section types are never linked. Some are only linked when
142 // doing a relocateable link.
143 switch (shdr
.get_sh_type())
145 case elfcpp::SHT_NULL
:
146 case elfcpp::SHT_SYMTAB
:
147 case elfcpp::SHT_DYNSYM
:
148 case elfcpp::SHT_STRTAB
:
149 case elfcpp::SHT_HASH
:
150 case elfcpp::SHT_DYNAMIC
:
151 case elfcpp::SHT_SYMTAB_SHNDX
:
154 case elfcpp::SHT_RELA
:
155 case elfcpp::SHT_REL
:
156 case elfcpp::SHT_GROUP
:
157 return parameters
->output_is_object();
159 case elfcpp::SHT_PROGBITS
:
160 if (parameters
->strip_debug()
161 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
163 // Debugging sections can only be recognized by name.
164 if (is_prefix_of(".debug", name
)
165 || is_prefix_of(".gnu.linkonce.wi.", name
)
166 || is_prefix_of(".line", name
)
167 || is_prefix_of(".stab", name
))
170 if (parameters
->strip_debug_gdb()
171 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
173 // Debugging sections can only be recognized by name.
174 if (is_prefix_of(".debug", name
)
175 && !is_gdb_debug_section(name
))
185 // Return an output section named NAME, or NULL if there is none.
188 Layout::find_output_section(const char* name
) const
190 for (Section_list::const_iterator p
= this->section_list_
.begin();
191 p
!= this->section_list_
.end();
193 if (strcmp((*p
)->name(), name
) == 0)
198 // Return an output segment of type TYPE, with segment flags SET set
199 // and segment flags CLEAR clear. Return NULL if there is none.
202 Layout::find_output_segment(elfcpp::PT type
, elfcpp::Elf_Word set
,
203 elfcpp::Elf_Word clear
) const
205 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
206 p
!= this->segment_list_
.end();
208 if (static_cast<elfcpp::PT
>((*p
)->type()) == type
209 && ((*p
)->flags() & set
) == set
210 && ((*p
)->flags() & clear
) == 0)
215 // Return the output section to use for section NAME with type TYPE
216 // and section flags FLAGS. NAME must be canonicalized in the string
217 // pool, and NAME_KEY is the key.
220 Layout::get_output_section(const char* name
, Stringpool::Key name_key
,
221 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
)
223 const Key
key(name_key
, std::make_pair(type
, flags
));
224 const std::pair
<Key
, Output_section
*> v(key
, NULL
);
225 std::pair
<Section_name_map::iterator
, bool> ins(
226 this->section_name_map_
.insert(v
));
229 return ins
.first
->second
;
232 // This is the first time we've seen this name/type/flags
234 Output_section
* os
= this->make_output_section(name
, type
, flags
);
235 ins
.first
->second
= os
;
240 // Pick the output section to use for section NAME, in input file
241 // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a
242 // linker created section. ADJUST_NAME is true if we should apply the
243 // standard name mappings in Layout::output_section_name. This will
244 // return NULL if the input section should be discarded.
247 Layout::choose_output_section(const Relobj
* relobj
, const char* name
,
248 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
,
251 // We should ignore some flags. FIXME: This will need some
252 // adjustment for ld -r.
253 flags
&= ~ (elfcpp::SHF_INFO_LINK
254 | elfcpp::SHF_LINK_ORDER
257 | elfcpp::SHF_STRINGS
);
259 if (this->script_options_
->saw_sections_clause())
261 // We are using a SECTIONS clause, so the output section is
262 // chosen based only on the name.
264 Script_sections
* ss
= this->script_options_
->script_sections();
265 const char* file_name
= relobj
== NULL
? NULL
: relobj
->name().c_str();
266 Output_section
** output_section_slot
;
267 name
= ss
->output_section_name(file_name
, name
, &output_section_slot
);
270 // The SECTIONS clause says to discard this input section.
274 // If this is an orphan section--one not mentioned in the linker
275 // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the
276 // default processing below.
278 if (output_section_slot
!= NULL
)
280 if (*output_section_slot
!= NULL
)
281 return *output_section_slot
;
283 // We don't put sections found in the linker script into
284 // SECTION_NAME_MAP_. That keeps us from getting confused
285 // if an orphan section is mapped to a section with the same
286 // name as one in the linker script.
288 name
= this->namepool_
.add(name
, false, NULL
);
290 Output_section
* os
= this->make_output_section(name
, type
, flags
);
291 os
->set_found_in_sections_clause();
292 *output_section_slot
= os
;
297 // FIXME: Handle SHF_OS_NONCONFORMING somewhere.
299 // Turn NAME from the name of the input section into the name of the
302 size_t len
= strlen(name
);
303 if (adjust_name
&& !parameters
->output_is_object())
304 name
= Layout::output_section_name(name
, &len
);
306 Stringpool::Key name_key
;
307 name
= this->namepool_
.add_with_length(name
, len
, true, &name_key
);
309 // Find or make the output section. The output section is selected
310 // based on the section name, type, and flags.
311 return this->get_output_section(name
, name_key
, type
, flags
);
314 // Return the output section to use for input section SHNDX, with name
315 // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the
316 // index of a relocation section which applies to this section, or 0
317 // if none, or -1U if more than one. RELOC_TYPE is the type of the
318 // relocation section if there is one. Set *OFF to the offset of this
319 // input section without the output section. Return NULL if the
320 // section should be discarded. Set *OFF to -1 if the section
321 // contents should not be written directly to the output file, but
322 // will instead receive special handling.
324 template<int size
, bool big_endian
>
326 Layout::layout(Sized_relobj
<size
, big_endian
>* object
, unsigned int shndx
,
327 const char* name
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
328 unsigned int reloc_shndx
, unsigned int, off_t
* off
)
330 if (!this->include_section(object
, name
, shdr
))
333 Output_section
* os
= this->choose_output_section(object
,
341 // FIXME: Handle SHF_LINK_ORDER somewhere.
343 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
344 this->script_options_
->saw_sections_clause());
349 // Special GNU handling of sections name .eh_frame. They will
350 // normally hold exception frame data as defined by the C++ ABI
351 // (http://codesourcery.com/cxx-abi/).
353 template<int size
, bool big_endian
>
355 Layout::layout_eh_frame(Sized_relobj
<size
, big_endian
>* object
,
356 const unsigned char* symbols
,
358 const unsigned char* symbol_names
,
359 off_t symbol_names_size
,
361 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
362 unsigned int reloc_shndx
, unsigned int reloc_type
,
365 gold_assert(shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
);
366 gold_assert(shdr
.get_sh_flags() == elfcpp::SHF_ALLOC
);
368 const char* const name
= ".eh_frame";
369 Output_section
* os
= this->choose_output_section(object
,
371 elfcpp::SHT_PROGBITS
,
377 if (this->eh_frame_section_
== NULL
)
379 this->eh_frame_section_
= os
;
380 this->eh_frame_data_
= new Eh_frame();
381 os
->add_output_section_data(this->eh_frame_data_
);
383 if (this->options_
.create_eh_frame_hdr())
385 Output_section
* hdr_os
=
386 this->choose_output_section(NULL
,
388 elfcpp::SHT_PROGBITS
,
394 Eh_frame_hdr
* hdr_posd
= new Eh_frame_hdr(os
,
395 this->eh_frame_data_
);
396 hdr_os
->add_output_section_data(hdr_posd
);
398 hdr_os
->set_after_input_sections();
400 if (!this->script_options_
->saw_phdrs_clause())
402 Output_segment
* hdr_oseg
;
403 hdr_oseg
= this->make_output_segment(elfcpp::PT_GNU_EH_FRAME
,
405 hdr_oseg
->add_output_section(hdr_os
, elfcpp::PF_R
);
408 this->eh_frame_data_
->set_eh_frame_hdr(hdr_posd
);
413 gold_assert(this->eh_frame_section_
== os
);
415 if (this->eh_frame_data_
->add_ehframe_input_section(object
,
426 // We couldn't handle this .eh_frame section for some reason.
427 // Add it as a normal section.
428 bool saw_sections_clause
= this->script_options_
->saw_sections_clause();
429 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
430 saw_sections_clause
);
436 // Add POSD to an output section using NAME, TYPE, and FLAGS.
439 Layout::add_output_section_data(const char* name
, elfcpp::Elf_Word type
,
440 elfcpp::Elf_Xword flags
,
441 Output_section_data
* posd
)
443 Output_section
* os
= this->choose_output_section(NULL
, name
, type
, flags
,
446 os
->add_output_section_data(posd
);
449 // Map section flags to segment flags.
452 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags
)
454 elfcpp::Elf_Word ret
= elfcpp::PF_R
;
455 if ((flags
& elfcpp::SHF_WRITE
) != 0)
457 if ((flags
& elfcpp::SHF_EXECINSTR
) != 0)
462 // Sometimes we compress sections. This is typically done for
463 // sections that are not part of normal program execution (such as
464 // .debug_* sections), and where the readers of these sections know
465 // how to deal with compressed sections. (To make it easier for them,
466 // we will rename the ouput section in such cases from .foo to
467 // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine
468 // doesn't say for certain whether we'll compress -- it depends on
469 // commandline options as well -- just whether this section is a
470 // candidate for compression.
473 is_compressible_debug_section(const char* secname
)
475 return (strncmp(secname
, ".debug", sizeof(".debug") - 1) == 0);
478 // Make a new Output_section, and attach it to segments as
482 Layout::make_output_section(const char* name
, elfcpp::Elf_Word type
,
483 elfcpp::Elf_Xword flags
)
486 if ((flags
& elfcpp::SHF_ALLOC
) == 0
487 && this->options_
.compress_debug_sections()
488 && is_compressible_debug_section(name
))
489 os
= new Output_compressed_section(&this->options_
, name
, type
, flags
);
491 os
= new Output_section(name
, type
, flags
);
493 this->section_list_
.push_back(os
);
495 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
496 this->unattached_section_list_
.push_back(os
);
499 // If we have a SECTIONS clause, we can't handle the attachment
500 // to segments until after we've seen all the sections.
501 if (this->script_options_
->saw_sections_clause())
504 gold_assert(!this->script_options_
->saw_phdrs_clause());
506 // This output section goes into a PT_LOAD segment.
508 elfcpp::Elf_Word seg_flags
= Layout::section_flags_to_segment(flags
);
510 // The only thing we really care about for PT_LOAD segments is
511 // whether or not they are writable, so that is how we search
512 // for them. People who need segments sorted on some other
513 // basis will have to wait until we implement a mechanism for
514 // them to describe the segments they want.
516 Segment_list::const_iterator p
;
517 for (p
= this->segment_list_
.begin();
518 p
!= this->segment_list_
.end();
521 if ((*p
)->type() == elfcpp::PT_LOAD
522 && ((*p
)->flags() & elfcpp::PF_W
) == (seg_flags
& elfcpp::PF_W
))
524 (*p
)->add_output_section(os
, seg_flags
);
529 if (p
== this->segment_list_
.end())
531 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_LOAD
,
533 oseg
->add_output_section(os
, seg_flags
);
536 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
538 if (type
== elfcpp::SHT_NOTE
)
540 // See if we already have an equivalent PT_NOTE segment.
541 for (p
= this->segment_list_
.begin();
542 p
!= segment_list_
.end();
545 if ((*p
)->type() == elfcpp::PT_NOTE
546 && (((*p
)->flags() & elfcpp::PF_W
)
547 == (seg_flags
& elfcpp::PF_W
)))
549 (*p
)->add_output_section(os
, seg_flags
);
554 if (p
== this->segment_list_
.end())
556 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_NOTE
,
558 oseg
->add_output_section(os
, seg_flags
);
562 // If we see a loadable SHF_TLS section, we create a PT_TLS
563 // segment. There can only be one such segment.
564 if ((flags
& elfcpp::SHF_TLS
) != 0)
566 if (this->tls_segment_
== NULL
)
567 this->tls_segment_
= this->make_output_segment(elfcpp::PT_TLS
,
569 this->tls_segment_
->add_output_section(os
, seg_flags
);
576 // Return the number of segments we expect to see.
579 Layout::expected_segment_count() const
581 size_t ret
= this->segment_list_
.size();
583 // If we didn't see a SECTIONS clause in a linker script, we should
584 // already have the complete list of segments. Otherwise we ask the
585 // SECTIONS clause how many segments it expects, and add in the ones
586 // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.)
588 if (!this->script_options_
->saw_sections_clause())
592 const Script_sections
* ss
= this->script_options_
->script_sections();
593 return ret
+ ss
->expected_segment_count(this);
597 // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK
598 // is whether we saw a .note.GNU-stack section in the object file.
599 // GNU_STACK_FLAGS is the section flags. The flags give the
600 // protection required for stack memory. We record this in an
601 // executable as a PT_GNU_STACK segment. If an object file does not
602 // have a .note.GNU-stack segment, we must assume that it is an old
603 // object. On some targets that will force an executable stack.
606 Layout::layout_gnu_stack(bool seen_gnu_stack
, uint64_t gnu_stack_flags
)
609 this->input_without_gnu_stack_note_
= true;
612 this->input_with_gnu_stack_note_
= true;
613 if ((gnu_stack_flags
& elfcpp::SHF_EXECINSTR
) != 0)
614 this->input_requires_executable_stack_
= true;
618 // Create the dynamic sections which are needed before we read the
622 Layout::create_initial_dynamic_sections(Symbol_table
* symtab
)
624 if (parameters
->doing_static_link())
627 this->dynamic_section_
= this->choose_output_section(NULL
, ".dynamic",
630 | elfcpp::SHF_WRITE
),
633 symtab
->define_in_output_data("_DYNAMIC", NULL
, this->dynamic_section_
, 0, 0,
634 elfcpp::STT_OBJECT
, elfcpp::STB_LOCAL
,
635 elfcpp::STV_HIDDEN
, 0, false, false);
637 this->dynamic_data_
= new Output_data_dynamic(&this->dynpool_
);
639 this->dynamic_section_
->add_output_section_data(this->dynamic_data_
);
642 // For each output section whose name can be represented as C symbol,
643 // define __start and __stop symbols for the section. This is a GNU
647 Layout::define_section_symbols(Symbol_table
* symtab
)
649 for (Section_list::const_iterator p
= this->section_list_
.begin();
650 p
!= this->section_list_
.end();
653 const char* const name
= (*p
)->name();
654 if (name
[strspn(name
,
656 "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
657 "abcdefghijklmnopqrstuvwxyz"
661 const std::string
name_string(name
);
662 const std::string
start_name("__start_" + name_string
);
663 const std::string
stop_name("__stop_" + name_string
);
665 symtab
->define_in_output_data(start_name
.c_str(),
674 false, // offset_is_from_end
675 true); // only_if_ref
677 symtab
->define_in_output_data(stop_name
.c_str(),
686 true, // offset_is_from_end
687 true); // only_if_ref
692 // Find the first read-only PT_LOAD segment, creating one if
696 Layout::find_first_load_seg()
698 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
699 p
!= this->segment_list_
.end();
702 if ((*p
)->type() == elfcpp::PT_LOAD
703 && ((*p
)->flags() & elfcpp::PF_R
) != 0
704 && ((*p
)->flags() & elfcpp::PF_W
) == 0)
708 gold_assert(!this->script_options_
->saw_phdrs_clause());
710 Output_segment
* load_seg
= this->make_output_segment(elfcpp::PT_LOAD
,
715 // Finalize the layout. When this is called, we have created all the
716 // output sections and all the output segments which are based on
717 // input sections. We have several things to do, and we have to do
718 // them in the right order, so that we get the right results correctly
721 // 1) Finalize the list of output segments and create the segment
724 // 2) Finalize the dynamic symbol table and associated sections.
726 // 3) Determine the final file offset of all the output segments.
728 // 4) Determine the final file offset of all the SHF_ALLOC output
731 // 5) Create the symbol table sections and the section name table
734 // 6) Finalize the symbol table: set symbol values to their final
735 // value and make a final determination of which symbols are going
736 // into the output symbol table.
738 // 7) Create the section table header.
740 // 8) Determine the final file offset of all the output sections which
741 // are not SHF_ALLOC, including the section table header.
743 // 9) Finalize the ELF file header.
745 // This function returns the size of the output file.
748 Layout::finalize(const Input_objects
* input_objects
, Symbol_table
* symtab
,
751 Target
* const target
= input_objects
->target();
753 target
->finalize_sections(this);
755 this->count_local_symbols(task
, input_objects
);
757 this->create_gold_note();
758 this->create_executable_stack_info(target
);
760 Output_segment
* phdr_seg
= NULL
;
761 if (!parameters
->output_is_object() && !parameters
->doing_static_link())
763 // There was a dynamic object in the link. We need to create
764 // some information for the dynamic linker.
766 // Create the PT_PHDR segment which will hold the program
768 if (!this->script_options_
->saw_phdrs_clause())
769 phdr_seg
= this->make_output_segment(elfcpp::PT_PHDR
, elfcpp::PF_R
);
771 // Create the dynamic symbol table, including the hash table.
772 Output_section
* dynstr
;
773 std::vector
<Symbol
*> dynamic_symbols
;
774 unsigned int local_dynamic_count
;
775 Versions
versions(this->options_
, &this->dynpool_
);
776 this->create_dynamic_symtab(input_objects
, symtab
, &dynstr
,
777 &local_dynamic_count
, &dynamic_symbols
,
780 // Create the .interp section to hold the name of the
781 // interpreter, and put it in a PT_INTERP segment.
782 if (!parameters
->output_is_shared())
783 this->create_interp(target
);
785 // Finish the .dynamic section to hold the dynamic data, and put
786 // it in a PT_DYNAMIC segment.
787 this->finish_dynamic_section(input_objects
, symtab
);
789 // We should have added everything we need to the dynamic string
791 this->dynpool_
.set_string_offsets();
793 // Create the version sections. We can't do this until the
794 // dynamic string table is complete.
795 this->create_version_sections(&versions
, symtab
, local_dynamic_count
,
796 dynamic_symbols
, dynstr
);
799 // If there is a SECTIONS clause, put all the input sections into
800 // the required order.
801 Output_segment
* load_seg
;
802 if (this->script_options_
->saw_sections_clause())
803 load_seg
= this->set_section_addresses_from_script(symtab
);
805 load_seg
= this->find_first_load_seg();
807 gold_assert(phdr_seg
== NULL
|| load_seg
!= NULL
);
809 // Lay out the segment headers.
810 Output_segment_headers
* segment_headers
;
811 segment_headers
= new Output_segment_headers(this->segment_list_
);
812 if (load_seg
!= NULL
)
813 load_seg
->add_initial_output_data(segment_headers
);
814 if (phdr_seg
!= NULL
)
815 phdr_seg
->add_initial_output_data(segment_headers
);
817 // Lay out the file header.
818 Output_file_header
* file_header
;
819 file_header
= new Output_file_header(target
, symtab
, segment_headers
,
820 this->script_options_
->entry());
821 if (load_seg
!= NULL
)
822 load_seg
->add_initial_output_data(file_header
);
824 this->special_output_list_
.push_back(file_header
);
825 this->special_output_list_
.push_back(segment_headers
);
827 if (this->script_options_
->saw_phdrs_clause())
829 // Support use of FILEHDRS and PHDRS attachments in a PHDRS
830 // clause in a linker script.
831 Script_sections
* ss
= this->script_options_
->script_sections();
832 ss
->put_headers_in_phdrs(file_header
, segment_headers
);
835 // We set the output section indexes in set_segment_offsets and
836 // set_section_indexes.
837 unsigned int shndx
= 1;
839 // Set the file offsets of all the segments, and all the sections
841 off_t off
= this->set_segment_offsets(target
, load_seg
, &shndx
);
843 // Set the file offsets of all the non-data sections we've seen so
844 // far which don't have to wait for the input sections. We need
845 // this in order to finalize local symbols in non-allocated
847 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
849 // Create the symbol table sections.
850 this->create_symtab_sections(input_objects
, symtab
, &off
);
851 if (!parameters
->doing_static_link())
852 this->assign_local_dynsym_offsets(input_objects
);
854 // Process any symbol assignments from a linker script. This must
855 // be called after the symbol table has been finalized.
856 this->script_options_
->finalize_symbols(symtab
, this);
858 // Create the .shstrtab section.
859 Output_section
* shstrtab_section
= this->create_shstrtab();
861 // Set the file offsets of the rest of the non-data sections which
862 // don't have to wait for the input sections.
863 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
865 // Now that all sections have been created, set the section indexes.
866 shndx
= this->set_section_indexes(shndx
);
868 // Create the section table header.
869 this->create_shdrs(&off
);
871 // If there are no sections which require postprocessing, we can
872 // handle the section names now, and avoid a resize later.
873 if (!this->any_postprocessing_sections_
)
874 off
= this->set_section_offsets(off
,
875 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
877 file_header
->set_section_info(this->section_headers_
, shstrtab_section
);
879 // Now we know exactly where everything goes in the output file
880 // (except for non-allocated sections which require postprocessing).
881 Output_data::layout_complete();
883 this->output_file_size_
= off
;
888 // Create a .note section for an executable or shared library. This
889 // records the version of gold used to create the binary.
892 Layout::create_gold_note()
894 if (parameters
->output_is_object())
897 // Authorities all agree that the values in a .note field should
898 // be aligned on 4-byte boundaries for 32-bit binaries. However,
899 // they differ on what the alignment is for 64-bit binaries.
900 // The GABI says unambiguously they take 8-byte alignment:
901 // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section
902 // Other documentation says alignment should always be 4 bytes:
903 // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format
904 // GNU ld and GNU readelf both support the latter (at least as of
905 // version 2.16.91), and glibc always generates the latter for
906 // .note.ABI-tag (as of version 1.6), so that's the one we go with
908 #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default.
909 const int size
= parameters
->get_size();
914 // The contents of the .note section.
915 const char* name
= "GNU";
916 std::string
desc(std::string("gold ") + gold::get_version_string());
917 size_t namesz
= strlen(name
) + 1;
918 size_t aligned_namesz
= align_address(namesz
, size
/ 8);
919 size_t descsz
= desc
.length() + 1;
920 size_t aligned_descsz
= align_address(descsz
, size
/ 8);
921 const int note_type
= 4;
923 size_t notesz
= 3 * (size
/ 8) + aligned_namesz
+ aligned_descsz
;
925 unsigned char buffer
[128];
926 gold_assert(sizeof buffer
>= notesz
);
927 memset(buffer
, 0, notesz
);
929 bool is_big_endian
= parameters
->is_big_endian();
935 elfcpp::Swap
<32, false>::writeval(buffer
, namesz
);
936 elfcpp::Swap
<32, false>::writeval(buffer
+ 4, descsz
);
937 elfcpp::Swap
<32, false>::writeval(buffer
+ 8, note_type
);
941 elfcpp::Swap
<32, true>::writeval(buffer
, namesz
);
942 elfcpp::Swap
<32, true>::writeval(buffer
+ 4, descsz
);
943 elfcpp::Swap
<32, true>::writeval(buffer
+ 8, note_type
);
950 elfcpp::Swap
<64, false>::writeval(buffer
, namesz
);
951 elfcpp::Swap
<64, false>::writeval(buffer
+ 8, descsz
);
952 elfcpp::Swap
<64, false>::writeval(buffer
+ 16, note_type
);
956 elfcpp::Swap
<64, true>::writeval(buffer
, namesz
);
957 elfcpp::Swap
<64, true>::writeval(buffer
+ 8, descsz
);
958 elfcpp::Swap
<64, true>::writeval(buffer
+ 16, note_type
);
964 memcpy(buffer
+ 3 * (size
/ 8), name
, namesz
);
965 memcpy(buffer
+ 3 * (size
/ 8) + aligned_namesz
, desc
.data(), descsz
);
967 const char* note_name
= this->namepool_
.add(".note", false, NULL
);
968 Output_section
* os
= this->make_output_section(note_name
,
971 Output_section_data
* posd
= new Output_data_const(buffer
, notesz
,
973 os
->add_output_section_data(posd
);
976 // Record whether the stack should be executable. This can be set
977 // from the command line using the -z execstack or -z noexecstack
978 // options. Otherwise, if any input file has a .note.GNU-stack
979 // section with the SHF_EXECINSTR flag set, the stack should be
980 // executable. Otherwise, if at least one input file a
981 // .note.GNU-stack section, and some input file has no .note.GNU-stack
982 // section, we use the target default for whether the stack should be
983 // executable. Otherwise, we don't generate a stack note. When
984 // generating a object file, we create a .note.GNU-stack section with
985 // the appropriate marking. When generating an executable or shared
986 // library, we create a PT_GNU_STACK segment.
989 Layout::create_executable_stack_info(const Target
* target
)
991 bool is_stack_executable
;
992 if (this->options_
.is_execstack_set())
993 is_stack_executable
= this->options_
.is_stack_executable();
994 else if (!this->input_with_gnu_stack_note_
)
998 if (this->input_requires_executable_stack_
)
999 is_stack_executable
= true;
1000 else if (this->input_without_gnu_stack_note_
)
1001 is_stack_executable
= target
->is_default_stack_executable();
1003 is_stack_executable
= false;
1006 if (parameters
->output_is_object())
1008 const char* name
= this->namepool_
.add(".note.GNU-stack", false, NULL
);
1009 elfcpp::Elf_Xword flags
= 0;
1010 if (is_stack_executable
)
1011 flags
|= elfcpp::SHF_EXECINSTR
;
1012 this->make_output_section(name
, elfcpp::SHT_PROGBITS
, flags
);
1016 if (this->script_options_
->saw_phdrs_clause())
1018 int flags
= elfcpp::PF_R
| elfcpp::PF_W
;
1019 if (is_stack_executable
)
1020 flags
|= elfcpp::PF_X
;
1021 this->make_output_segment(elfcpp::PT_GNU_STACK
, flags
);
1025 // Return whether SEG1 should be before SEG2 in the output file. This
1026 // is based entirely on the segment type and flags. When this is
1027 // called the segment addresses has normally not yet been set.
1030 Layout::segment_precedes(const Output_segment
* seg1
,
1031 const Output_segment
* seg2
)
1033 elfcpp::Elf_Word type1
= seg1
->type();
1034 elfcpp::Elf_Word type2
= seg2
->type();
1036 // The single PT_PHDR segment is required to precede any loadable
1037 // segment. We simply make it always first.
1038 if (type1
== elfcpp::PT_PHDR
)
1040 gold_assert(type2
!= elfcpp::PT_PHDR
);
1043 if (type2
== elfcpp::PT_PHDR
)
1046 // The single PT_INTERP segment is required to precede any loadable
1047 // segment. We simply make it always second.
1048 if (type1
== elfcpp::PT_INTERP
)
1050 gold_assert(type2
!= elfcpp::PT_INTERP
);
1053 if (type2
== elfcpp::PT_INTERP
)
1056 // We then put PT_LOAD segments before any other segments.
1057 if (type1
== elfcpp::PT_LOAD
&& type2
!= elfcpp::PT_LOAD
)
1059 if (type2
== elfcpp::PT_LOAD
&& type1
!= elfcpp::PT_LOAD
)
1062 // We put the PT_TLS segment last, because that is where the dynamic
1063 // linker expects to find it (this is just for efficiency; other
1064 // positions would also work correctly).
1065 if (type1
== elfcpp::PT_TLS
&& type2
!= elfcpp::PT_TLS
)
1067 if (type2
== elfcpp::PT_TLS
&& type1
!= elfcpp::PT_TLS
)
1070 const elfcpp::Elf_Word flags1
= seg1
->flags();
1071 const elfcpp::Elf_Word flags2
= seg2
->flags();
1073 // The order of non-PT_LOAD segments is unimportant. We simply sort
1074 // by the numeric segment type and flags values. There should not
1075 // be more than one segment with the same type and flags.
1076 if (type1
!= elfcpp::PT_LOAD
)
1079 return type1
< type2
;
1080 gold_assert(flags1
!= flags2
);
1081 return flags1
< flags2
;
1084 // If the addresses are set already, sort by load address.
1085 if (seg1
->are_addresses_set())
1087 if (!seg2
->are_addresses_set())
1090 unsigned int section_count1
= seg1
->output_section_count();
1091 unsigned int section_count2
= seg2
->output_section_count();
1092 if (section_count1
== 0 && section_count2
> 0)
1094 if (section_count1
> 0 && section_count2
== 0)
1097 uint64_t paddr1
= seg1
->first_section_load_address();
1098 uint64_t paddr2
= seg2
->first_section_load_address();
1099 if (paddr1
!= paddr2
)
1100 return paddr1
< paddr2
;
1102 else if (seg2
->are_addresses_set())
1105 // We sort PT_LOAD segments based on the flags. Readonly segments
1106 // come before writable segments. Then executable segments come
1107 // before non-executable segments. Then the unlikely case of a
1108 // non-readable segment comes before the normal case of a readable
1109 // segment. If there are multiple segments with the same type and
1110 // flags, we require that the address be set, and we sort by
1111 // virtual address and then physical address.
1112 if ((flags1
& elfcpp::PF_W
) != (flags2
& elfcpp::PF_W
))
1113 return (flags1
& elfcpp::PF_W
) == 0;
1114 if ((flags1
& elfcpp::PF_X
) != (flags2
& elfcpp::PF_X
))
1115 return (flags1
& elfcpp::PF_X
) != 0;
1116 if ((flags1
& elfcpp::PF_R
) != (flags2
& elfcpp::PF_R
))
1117 return (flags1
& elfcpp::PF_R
) == 0;
1119 // We shouldn't get here--we shouldn't create segments which we
1120 // can't distinguish.
1124 // Set the file offsets of all the segments, and all the sections they
1125 // contain. They have all been created. LOAD_SEG must be be laid out
1126 // first. Return the offset of the data to follow.
1129 Layout::set_segment_offsets(const Target
* target
, Output_segment
* load_seg
,
1130 unsigned int *pshndx
)
1132 // Sort them into the final order.
1133 std::sort(this->segment_list_
.begin(), this->segment_list_
.end(),
1134 Layout::Compare_segments());
1136 // Find the PT_LOAD segments, and set their addresses and offsets
1137 // and their section's addresses and offsets.
1139 if (this->options_
.user_set_text_segment_address())
1140 addr
= options_
.text_segment_address();
1141 else if (parameters
->output_is_shared())
1144 addr
= target
->default_text_segment_address();
1147 // If LOAD_SEG is NULL, then the file header and segment headers
1148 // will not be loadable. But they still need to be at offset 0 in
1149 // the file. Set their offsets now.
1150 if (load_seg
== NULL
)
1152 for (Data_list::iterator p
= this->special_output_list_
.begin();
1153 p
!= this->special_output_list_
.end();
1156 off
= align_address(off
, (*p
)->addralign());
1157 (*p
)->set_address_and_file_offset(0, off
);
1158 off
+= (*p
)->data_size();
1162 bool was_readonly
= false;
1163 for (Segment_list::iterator p
= this->segment_list_
.begin();
1164 p
!= this->segment_list_
.end();
1167 if ((*p
)->type() == elfcpp::PT_LOAD
)
1169 if (load_seg
!= NULL
&& load_seg
!= *p
)
1173 uint64_t orig_addr
= addr
;
1174 uint64_t orig_off
= off
;
1176 uint64_t aligned_addr
= 0;
1177 uint64_t abi_pagesize
= target
->abi_pagesize();
1179 // FIXME: This should depend on the -n and -N options.
1180 (*p
)->set_minimum_p_align(target
->common_pagesize());
1182 bool are_addresses_set
= (*p
)->are_addresses_set();
1183 if (are_addresses_set
)
1185 // When it comes to setting file offsets, we care about
1186 // the physical address.
1187 addr
= (*p
)->paddr();
1189 // Adjust the file offset to the same address modulo the
1191 uint64_t unsigned_off
= off
;
1192 uint64_t aligned_off
= ((unsigned_off
& ~(abi_pagesize
- 1))
1193 | (addr
& (abi_pagesize
- 1)));
1194 if (aligned_off
< unsigned_off
)
1195 aligned_off
+= abi_pagesize
;
1200 // If the last segment was readonly, and this one is
1201 // not, then skip the address forward one page,
1202 // maintaining the same position within the page. This
1203 // lets us store both segments overlapping on a single
1204 // page in the file, but the loader will put them on
1205 // different pages in memory.
1207 addr
= align_address(addr
, (*p
)->maximum_alignment());
1208 aligned_addr
= addr
;
1210 if (was_readonly
&& ((*p
)->flags() & elfcpp::PF_W
) != 0)
1212 if ((addr
& (abi_pagesize
- 1)) != 0)
1213 addr
= addr
+ abi_pagesize
;
1216 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
1219 unsigned int shndx_hold
= *pshndx
;
1220 uint64_t new_addr
= (*p
)->set_section_addresses(false, addr
, &off
,
1223 // Now that we know the size of this segment, we may be able
1224 // to save a page in memory, at the cost of wasting some
1225 // file space, by instead aligning to the start of a new
1226 // page. Here we use the real machine page size rather than
1227 // the ABI mandated page size.
1229 if (!are_addresses_set
&& aligned_addr
!= addr
)
1231 uint64_t common_pagesize
= target
->common_pagesize();
1232 uint64_t first_off
= (common_pagesize
1234 & (common_pagesize
- 1)));
1235 uint64_t last_off
= new_addr
& (common_pagesize
- 1);
1238 && ((aligned_addr
& ~ (common_pagesize
- 1))
1239 != (new_addr
& ~ (common_pagesize
- 1)))
1240 && first_off
+ last_off
<= common_pagesize
)
1242 *pshndx
= shndx_hold
;
1243 addr
= align_address(aligned_addr
, common_pagesize
);
1244 addr
= align_address(addr
, (*p
)->maximum_alignment());
1245 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
1246 new_addr
= (*p
)->set_section_addresses(true, addr
, &off
,
1253 if (((*p
)->flags() & elfcpp::PF_W
) == 0)
1254 was_readonly
= true;
1258 // Handle the non-PT_LOAD segments, setting their offsets from their
1259 // section's offsets.
1260 for (Segment_list::iterator p
= this->segment_list_
.begin();
1261 p
!= this->segment_list_
.end();
1264 if ((*p
)->type() != elfcpp::PT_LOAD
)
1268 // Set the TLS offsets for each section in the PT_TLS segment.
1269 if (this->tls_segment_
!= NULL
)
1270 this->tls_segment_
->set_tls_offsets();
1275 // Set the file offset of all the sections not associated with a
1279 Layout::set_section_offsets(off_t off
, Layout::Section_offset_pass pass
)
1281 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
1282 p
!= this->unattached_section_list_
.end();
1285 // The symtab section is handled in create_symtab_sections.
1286 if (*p
== this->symtab_section_
)
1289 // If we've already set the data size, don't set it again.
1290 if ((*p
)->is_offset_valid() && (*p
)->is_data_size_valid())
1293 if (pass
== BEFORE_INPUT_SECTIONS_PASS
1294 && (*p
)->requires_postprocessing())
1296 (*p
)->create_postprocessing_buffer();
1297 this->any_postprocessing_sections_
= true;
1300 if (pass
== BEFORE_INPUT_SECTIONS_PASS
1301 && (*p
)->after_input_sections())
1303 else if (pass
== POSTPROCESSING_SECTIONS_PASS
1304 && (!(*p
)->after_input_sections()
1305 || (*p
)->type() == elfcpp::SHT_STRTAB
))
1307 else if (pass
== STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
1308 && (!(*p
)->after_input_sections()
1309 || (*p
)->type() != elfcpp::SHT_STRTAB
))
1312 off
= align_address(off
, (*p
)->addralign());
1313 (*p
)->set_file_offset(off
);
1314 (*p
)->finalize_data_size();
1315 off
+= (*p
)->data_size();
1317 // At this point the name must be set.
1318 if (pass
!= STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
)
1319 this->namepool_
.add((*p
)->name(), false, NULL
);
1324 // Set the section indexes of all the sections not associated with a
1328 Layout::set_section_indexes(unsigned int shndx
)
1330 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
1331 p
!= this->unattached_section_list_
.end();
1334 (*p
)->set_out_shndx(shndx
);
1340 // Set the section addresses according to the linker script. This is
1341 // only called when we see a SECTIONS clause. This returns the
1342 // program segment which should hold the file header and segment
1343 // headers, if any. It will return NULL if they should not be in a
1347 Layout::set_section_addresses_from_script(Symbol_table
* symtab
)
1349 Script_sections
* ss
= this->script_options_
->script_sections();
1350 gold_assert(ss
->saw_sections_clause());
1352 // Place each orphaned output section in the script.
1353 for (Section_list::iterator p
= this->section_list_
.begin();
1354 p
!= this->section_list_
.end();
1357 if (!(*p
)->found_in_sections_clause())
1358 ss
->place_orphan(*p
);
1361 return this->script_options_
->set_section_addresses(symtab
, this);
1364 // Count the local symbols in the regular symbol table and the dynamic
1365 // symbol table, and build the respective string pools.
1368 Layout::count_local_symbols(const Task
* task
,
1369 const Input_objects
* input_objects
)
1371 // First, figure out an upper bound on the number of symbols we'll
1372 // be inserting into each pool. This helps us create the pools with
1373 // the right size, to avoid unnecessary hashtable resizing.
1374 unsigned int symbol_count
= 0;
1375 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1376 p
!= input_objects
->relobj_end();
1378 symbol_count
+= (*p
)->local_symbol_count();
1380 // Go from "upper bound" to "estimate." We overcount for two
1381 // reasons: we double-count symbols that occur in more than one
1382 // object file, and we count symbols that are dropped from the
1383 // output. Add it all together and assume we overcount by 100%.
1386 // We assume all symbols will go into both the sympool and dynpool.
1387 this->sympool_
.reserve(symbol_count
);
1388 this->dynpool_
.reserve(symbol_count
);
1390 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1391 p
!= input_objects
->relobj_end();
1394 Task_lock_obj
<Object
> tlo(task
, *p
);
1395 (*p
)->count_local_symbols(&this->sympool_
, &this->dynpool_
);
1399 // Create the symbol table sections. Here we also set the final
1400 // values of the symbols. At this point all the loadable sections are
1404 Layout::create_symtab_sections(const Input_objects
* input_objects
,
1405 Symbol_table
* symtab
,
1410 if (parameters
->get_size() == 32)
1412 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
1415 else if (parameters
->get_size() == 64)
1417 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
1424 off
= align_address(off
, align
);
1425 off_t startoff
= off
;
1427 // Save space for the dummy symbol at the start of the section. We
1428 // never bother to write this out--it will just be left as zero.
1430 unsigned int local_symbol_index
= 1;
1432 // Add STT_SECTION symbols for each Output section which needs one.
1433 for (Section_list::iterator p
= this->section_list_
.begin();
1434 p
!= this->section_list_
.end();
1437 if (!(*p
)->needs_symtab_index())
1438 (*p
)->set_symtab_index(-1U);
1441 (*p
)->set_symtab_index(local_symbol_index
);
1442 ++local_symbol_index
;
1447 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1448 p
!= input_objects
->relobj_end();
1451 unsigned int index
= (*p
)->finalize_local_symbols(local_symbol_index
,
1453 off
+= (index
- local_symbol_index
) * symsize
;
1454 local_symbol_index
= index
;
1457 unsigned int local_symcount
= local_symbol_index
;
1458 gold_assert(local_symcount
* symsize
== off
- startoff
);
1461 size_t dyn_global_index
;
1463 if (this->dynsym_section_
== NULL
)
1466 dyn_global_index
= 0;
1471 dyn_global_index
= this->dynsym_section_
->info();
1472 off_t locsize
= dyn_global_index
* this->dynsym_section_
->entsize();
1473 dynoff
= this->dynsym_section_
->offset() + locsize
;
1474 dyncount
= (this->dynsym_section_
->data_size() - locsize
) / symsize
;
1475 gold_assert(static_cast<off_t
>(dyncount
* symsize
)
1476 == this->dynsym_section_
->data_size() - locsize
);
1479 off
= symtab
->finalize(off
, dynoff
, dyn_global_index
, dyncount
,
1480 &this->sympool_
, &local_symcount
);
1482 if (!parameters
->strip_all())
1484 this->sympool_
.set_string_offsets();
1486 const char* symtab_name
= this->namepool_
.add(".symtab", false, NULL
);
1487 Output_section
* osymtab
= this->make_output_section(symtab_name
,
1490 this->symtab_section_
= osymtab
;
1492 Output_section_data
* pos
= new Output_data_fixed_space(off
- startoff
,
1494 osymtab
->add_output_section_data(pos
);
1496 const char* strtab_name
= this->namepool_
.add(".strtab", false, NULL
);
1497 Output_section
* ostrtab
= this->make_output_section(strtab_name
,
1501 Output_section_data
* pstr
= new Output_data_strtab(&this->sympool_
);
1502 ostrtab
->add_output_section_data(pstr
);
1504 osymtab
->set_file_offset(startoff
);
1505 osymtab
->finalize_data_size();
1506 osymtab
->set_link_section(ostrtab
);
1507 osymtab
->set_info(local_symcount
);
1508 osymtab
->set_entsize(symsize
);
1514 // Create the .shstrtab section, which holds the names of the
1515 // sections. At the time this is called, we have created all the
1516 // output sections except .shstrtab itself.
1519 Layout::create_shstrtab()
1521 // FIXME: We don't need to create a .shstrtab section if we are
1522 // stripping everything.
1524 const char* name
= this->namepool_
.add(".shstrtab", false, NULL
);
1526 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_STRTAB
, 0);
1528 // We can't write out this section until we've set all the section
1529 // names, and we don't set the names of compressed output sections
1530 // until relocations are complete.
1531 os
->set_after_input_sections();
1533 Output_section_data
* posd
= new Output_data_strtab(&this->namepool_
);
1534 os
->add_output_section_data(posd
);
1539 // Create the section headers. SIZE is 32 or 64. OFF is the file
1543 Layout::create_shdrs(off_t
* poff
)
1545 Output_section_headers
* oshdrs
;
1546 oshdrs
= new Output_section_headers(this,
1547 &this->segment_list_
,
1548 &this->unattached_section_list_
,
1550 off_t off
= align_address(*poff
, oshdrs
->addralign());
1551 oshdrs
->set_address_and_file_offset(0, off
);
1552 off
+= oshdrs
->data_size();
1554 this->section_headers_
= oshdrs
;
1557 // Create the dynamic symbol table.
1560 Layout::create_dynamic_symtab(const Input_objects
* input_objects
,
1561 Symbol_table
* symtab
,
1562 Output_section
**pdynstr
,
1563 unsigned int* plocal_dynamic_count
,
1564 std::vector
<Symbol
*>* pdynamic_symbols
,
1565 Versions
* pversions
)
1567 // Count all the symbols in the dynamic symbol table, and set the
1568 // dynamic symbol indexes.
1570 // Skip symbol 0, which is always all zeroes.
1571 unsigned int index
= 1;
1573 // Add STT_SECTION symbols for each Output section which needs one.
1574 for (Section_list::iterator p
= this->section_list_
.begin();
1575 p
!= this->section_list_
.end();
1578 if (!(*p
)->needs_dynsym_index())
1579 (*p
)->set_dynsym_index(-1U);
1582 (*p
)->set_dynsym_index(index
);
1587 // Count the local symbols that need to go in the dynamic symbol table,
1588 // and set the dynamic symbol indexes.
1589 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1590 p
!= input_objects
->relobj_end();
1593 unsigned int new_index
= (*p
)->set_local_dynsym_indexes(index
);
1597 unsigned int local_symcount
= index
;
1598 *plocal_dynamic_count
= local_symcount
;
1600 // FIXME: We have to tell set_dynsym_indexes whether the
1601 // -E/--export-dynamic option was used.
1602 index
= symtab
->set_dynsym_indexes(index
, pdynamic_symbols
,
1603 &this->dynpool_
, pversions
);
1607 const int size
= parameters
->get_size();
1610 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
1613 else if (size
== 64)
1615 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
1621 // Create the dynamic symbol table section.
1623 Output_section
* dynsym
= this->choose_output_section(NULL
, ".dynsym",
1628 Output_section_data
* odata
= new Output_data_fixed_space(index
* symsize
,
1630 dynsym
->add_output_section_data(odata
);
1632 dynsym
->set_info(local_symcount
);
1633 dynsym
->set_entsize(symsize
);
1634 dynsym
->set_addralign(align
);
1636 this->dynsym_section_
= dynsym
;
1638 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1639 odyn
->add_section_address(elfcpp::DT_SYMTAB
, dynsym
);
1640 odyn
->add_constant(elfcpp::DT_SYMENT
, symsize
);
1642 // Create the dynamic string table section.
1644 Output_section
* dynstr
= this->choose_output_section(NULL
, ".dynstr",
1649 Output_section_data
* strdata
= new Output_data_strtab(&this->dynpool_
);
1650 dynstr
->add_output_section_data(strdata
);
1652 dynsym
->set_link_section(dynstr
);
1653 this->dynamic_section_
->set_link_section(dynstr
);
1655 odyn
->add_section_address(elfcpp::DT_STRTAB
, dynstr
);
1656 odyn
->add_section_size(elfcpp::DT_STRSZ
, dynstr
);
1660 // Create the hash tables.
1662 // FIXME: We need an option to create a GNU hash table.
1664 unsigned char* phash
;
1665 unsigned int hashlen
;
1666 Dynobj::create_elf_hash_table(*pdynamic_symbols
, local_symcount
,
1669 Output_section
* hashsec
= this->choose_output_section(NULL
, ".hash",
1674 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
1677 hashsec
->add_output_section_data(hashdata
);
1679 hashsec
->set_link_section(dynsym
);
1680 hashsec
->set_entsize(4);
1682 odyn
->add_section_address(elfcpp::DT_HASH
, hashsec
);
1685 // Assign offsets to each local portion of the dynamic symbol table.
1688 Layout::assign_local_dynsym_offsets(const Input_objects
* input_objects
)
1690 Output_section
* dynsym
= this->dynsym_section_
;
1691 gold_assert(dynsym
!= NULL
);
1693 off_t off
= dynsym
->offset();
1695 // Skip the dummy symbol at the start of the section.
1696 off
+= dynsym
->entsize();
1698 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1699 p
!= input_objects
->relobj_end();
1702 unsigned int count
= (*p
)->set_local_dynsym_offset(off
);
1703 off
+= count
* dynsym
->entsize();
1707 // Create the version sections.
1710 Layout::create_version_sections(const Versions
* versions
,
1711 const Symbol_table
* symtab
,
1712 unsigned int local_symcount
,
1713 const std::vector
<Symbol
*>& dynamic_symbols
,
1714 const Output_section
* dynstr
)
1716 if (!versions
->any_defs() && !versions
->any_needs())
1719 if (parameters
->get_size() == 32)
1721 if (parameters
->is_big_endian())
1723 #ifdef HAVE_TARGET_32_BIG
1724 this->sized_create_version_sections
1725 SELECT_SIZE_ENDIAN_NAME(32, true)(
1726 versions
, symtab
, local_symcount
, dynamic_symbols
, dynstr
1727 SELECT_SIZE_ENDIAN(32, true));
1734 #ifdef HAVE_TARGET_32_LITTLE
1735 this->sized_create_version_sections
1736 SELECT_SIZE_ENDIAN_NAME(32, false)(
1737 versions
, symtab
, local_symcount
, dynamic_symbols
, dynstr
1738 SELECT_SIZE_ENDIAN(32, false));
1744 else if (parameters
->get_size() == 64)
1746 if (parameters
->is_big_endian())
1748 #ifdef HAVE_TARGET_64_BIG
1749 this->sized_create_version_sections
1750 SELECT_SIZE_ENDIAN_NAME(64, true)(
1751 versions
, symtab
, local_symcount
, dynamic_symbols
, dynstr
1752 SELECT_SIZE_ENDIAN(64, true));
1759 #ifdef HAVE_TARGET_64_LITTLE
1760 this->sized_create_version_sections
1761 SELECT_SIZE_ENDIAN_NAME(64, false)(
1762 versions
, symtab
, local_symcount
, dynamic_symbols
, dynstr
1763 SELECT_SIZE_ENDIAN(64, false));
1773 // Create the version sections, sized version.
1775 template<int size
, bool big_endian
>
1777 Layout::sized_create_version_sections(
1778 const Versions
* versions
,
1779 const Symbol_table
* symtab
,
1780 unsigned int local_symcount
,
1781 const std::vector
<Symbol
*>& dynamic_symbols
,
1782 const Output_section
* dynstr
1785 Output_section
* vsec
= this->choose_output_section(NULL
, ".gnu.version",
1786 elfcpp::SHT_GNU_versym
,
1790 unsigned char* vbuf
;
1792 versions
->symbol_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1793 symtab
, &this->dynpool_
, local_symcount
, dynamic_symbols
, &vbuf
, &vsize
1794 SELECT_SIZE_ENDIAN(size
, big_endian
));
1796 Output_section_data
* vdata
= new Output_data_const_buffer(vbuf
, vsize
, 2);
1798 vsec
->add_output_section_data(vdata
);
1799 vsec
->set_entsize(2);
1800 vsec
->set_link_section(this->dynsym_section_
);
1802 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1803 odyn
->add_section_address(elfcpp::DT_VERSYM
, vsec
);
1805 if (versions
->any_defs())
1807 Output_section
* vdsec
;
1808 vdsec
= this->choose_output_section(NULL
, ".gnu.version_d",
1809 elfcpp::SHT_GNU_verdef
,
1813 unsigned char* vdbuf
;
1814 unsigned int vdsize
;
1815 unsigned int vdentries
;
1816 versions
->def_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)(
1817 &this->dynpool_
, &vdbuf
, &vdsize
, &vdentries
1818 SELECT_SIZE_ENDIAN(size
, big_endian
));
1820 Output_section_data
* vddata
= new Output_data_const_buffer(vdbuf
,
1824 vdsec
->add_output_section_data(vddata
);
1825 vdsec
->set_link_section(dynstr
);
1826 vdsec
->set_info(vdentries
);
1828 odyn
->add_section_address(elfcpp::DT_VERDEF
, vdsec
);
1829 odyn
->add_constant(elfcpp::DT_VERDEFNUM
, vdentries
);
1832 if (versions
->any_needs())
1834 Output_section
* vnsec
;
1835 vnsec
= this->choose_output_section(NULL
, ".gnu.version_r",
1836 elfcpp::SHT_GNU_verneed
,
1840 unsigned char* vnbuf
;
1841 unsigned int vnsize
;
1842 unsigned int vnentries
;
1843 versions
->need_section_contents
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
)
1844 (&this->dynpool_
, &vnbuf
, &vnsize
, &vnentries
1845 SELECT_SIZE_ENDIAN(size
, big_endian
));
1847 Output_section_data
* vndata
= new Output_data_const_buffer(vnbuf
,
1851 vnsec
->add_output_section_data(vndata
);
1852 vnsec
->set_link_section(dynstr
);
1853 vnsec
->set_info(vnentries
);
1855 odyn
->add_section_address(elfcpp::DT_VERNEED
, vnsec
);
1856 odyn
->add_constant(elfcpp::DT_VERNEEDNUM
, vnentries
);
1860 // Create the .interp section and PT_INTERP segment.
1863 Layout::create_interp(const Target
* target
)
1865 const char* interp
= this->options_
.dynamic_linker();
1868 interp
= target
->dynamic_linker();
1869 gold_assert(interp
!= NULL
);
1872 size_t len
= strlen(interp
) + 1;
1874 Output_section_data
* odata
= new Output_data_const(interp
, len
, 1);
1876 Output_section
* osec
= this->choose_output_section(NULL
, ".interp",
1877 elfcpp::SHT_PROGBITS
,
1880 osec
->add_output_section_data(odata
);
1882 if (!this->script_options_
->saw_phdrs_clause())
1884 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_INTERP
,
1886 oseg
->add_initial_output_section(osec
, elfcpp::PF_R
);
1890 // Finish the .dynamic section and PT_DYNAMIC segment.
1893 Layout::finish_dynamic_section(const Input_objects
* input_objects
,
1894 const Symbol_table
* symtab
)
1896 if (!this->script_options_
->saw_phdrs_clause())
1898 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_DYNAMIC
,
1901 oseg
->add_initial_output_section(this->dynamic_section_
,
1902 elfcpp::PF_R
| elfcpp::PF_W
);
1905 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
1907 for (Input_objects::Dynobj_iterator p
= input_objects
->dynobj_begin();
1908 p
!= input_objects
->dynobj_end();
1911 // FIXME: Handle --as-needed.
1912 odyn
->add_string(elfcpp::DT_NEEDED
, (*p
)->soname());
1915 if (parameters
->output_is_shared())
1917 const char* soname
= this->options_
.soname();
1919 odyn
->add_string(elfcpp::DT_SONAME
, soname
);
1922 // FIXME: Support --init and --fini.
1923 Symbol
* sym
= symtab
->lookup("_init");
1924 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
1925 odyn
->add_symbol(elfcpp::DT_INIT
, sym
);
1927 sym
= symtab
->lookup("_fini");
1928 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
1929 odyn
->add_symbol(elfcpp::DT_FINI
, sym
);
1931 // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY.
1933 // Add a DT_RPATH entry if needed.
1934 const General_options::Dir_list
& rpath(this->options_
.rpath());
1937 std::string rpath_val
;
1938 for (General_options::Dir_list::const_iterator p
= rpath
.begin();
1942 if (rpath_val
.empty())
1943 rpath_val
= p
->name();
1946 // Eliminate duplicates.
1947 General_options::Dir_list::const_iterator q
;
1948 for (q
= rpath
.begin(); q
!= p
; ++q
)
1949 if (q
->name() == p
->name())
1954 rpath_val
+= p
->name();
1959 odyn
->add_string(elfcpp::DT_RPATH
, rpath_val
);
1962 // Look for text segments that have dynamic relocations.
1963 bool have_textrel
= false;
1964 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
1965 p
!= this->segment_list_
.end();
1968 if (((*p
)->flags() & elfcpp::PF_W
) == 0
1969 && (*p
)->dynamic_reloc_count() > 0)
1971 have_textrel
= true;
1976 // Add a DT_FLAGS entry. We add it even if no flags are set so that
1977 // post-link tools can easily modify these flags if desired.
1978 unsigned int flags
= 0;
1981 // Add a DT_TEXTREL for compatibility with older loaders.
1982 odyn
->add_constant(elfcpp::DT_TEXTREL
, 0);
1983 flags
|= elfcpp::DF_TEXTREL
;
1985 if (parameters
->output_is_shared() && this->has_static_tls())
1986 flags
|= elfcpp::DF_STATIC_TLS
;
1987 odyn
->add_constant(elfcpp::DT_FLAGS
, flags
);
1990 // The mapping of .gnu.linkonce section names to real section names.
1992 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
1993 const Layout::Linkonce_mapping
Layout::linkonce_mapping
[] =
1995 MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
1996 MAPPING_INIT("t", ".text"),
1997 MAPPING_INIT("r", ".rodata"),
1998 MAPPING_INIT("d", ".data"),
1999 MAPPING_INIT("b", ".bss"),
2000 MAPPING_INIT("s", ".sdata"),
2001 MAPPING_INIT("sb", ".sbss"),
2002 MAPPING_INIT("s2", ".sdata2"),
2003 MAPPING_INIT("sb2", ".sbss2"),
2004 MAPPING_INIT("wi", ".debug_info"),
2005 MAPPING_INIT("td", ".tdata"),
2006 MAPPING_INIT("tb", ".tbss"),
2007 MAPPING_INIT("lr", ".lrodata"),
2008 MAPPING_INIT("l", ".ldata"),
2009 MAPPING_INIT("lb", ".lbss"),
2013 const int Layout::linkonce_mapping_count
=
2014 sizeof(Layout::linkonce_mapping
) / sizeof(Layout::linkonce_mapping
[0]);
2016 // Return the name of the output section to use for a .gnu.linkonce
2017 // section. This is based on the default ELF linker script of the old
2018 // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
2019 // to ".text". Set *PLEN to the length of the name. *PLEN is
2020 // initialized to the length of NAME.
2023 Layout::linkonce_output_name(const char* name
, size_t *plen
)
2025 const char* s
= name
+ sizeof(".gnu.linkonce") - 1;
2029 const Linkonce_mapping
* plm
= linkonce_mapping
;
2030 for (int i
= 0; i
< linkonce_mapping_count
; ++i
, ++plm
)
2032 if (strncmp(s
, plm
->from
, plm
->fromlen
) == 0 && s
[plm
->fromlen
] == '.')
2041 // Choose the output section name to use given an input section name.
2042 // Set *PLEN to the length of the name. *PLEN is initialized to the
2046 Layout::output_section_name(const char* name
, size_t* plen
)
2048 if (Layout::is_linkonce(name
))
2050 // .gnu.linkonce sections are laid out as though they were named
2051 // for the sections are placed into.
2052 return Layout::linkonce_output_name(name
, plen
);
2055 // gcc 4.3 generates the following sorts of section names when it
2056 // needs a section name specific to a function:
2062 // .data.rel.local.FN
2064 // .data.rel.ro.local.FN
2071 // The GNU linker maps all of those to the part before the .FN,
2072 // except that .data.rel.local.FN is mapped to .data, and
2073 // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections
2074 // beginning with .data.rel.ro.local are grouped together.
2076 // For an anonymous namespace, the string FN can contain a '.'.
2078 // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
2079 // GNU linker maps to .rodata.
2081 // The .data.rel.ro sections enable a security feature triggered by
2082 // the -z relro option. Section which need to be relocated at
2083 // program startup time but which may be readonly after startup are
2084 // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO
2085 // segment. The dynamic linker will make that segment writable,
2086 // perform relocations, and then make it read-only. FIXME: We do
2087 // not yet implement this optimization.
2089 // It is hard to handle this in a principled way.
2091 // These are the rules we follow:
2093 // If the section name has no initial '.', or no dot other than an
2094 // initial '.', we use the name unchanged (i.e., "mysection" and
2095 // ".text" are unchanged).
2097 // If the name starts with ".data.rel.ro" we use ".data.rel.ro".
2099 // Otherwise, we drop the second '.' and everything that comes after
2100 // it (i.e., ".text.XXX" becomes ".text").
2102 const char* s
= name
;
2106 const char* sdot
= strchr(s
, '.');
2110 const char* const data_rel_ro
= ".data.rel.ro";
2111 if (strncmp(name
, data_rel_ro
, strlen(data_rel_ro
)) == 0)
2113 *plen
= strlen(data_rel_ro
);
2117 *plen
= sdot
- name
;
2121 // Record the signature of a comdat section, and return whether to
2122 // include it in the link. If GROUP is true, this is a regular
2123 // section group. If GROUP is false, this is a group signature
2124 // derived from the name of a linkonce section. We want linkonce
2125 // signatures and group signatures to block each other, but we don't
2126 // want a linkonce signature to block another linkonce signature.
2129 Layout::add_comdat(const char* signature
, bool group
)
2131 std::string
sig(signature
);
2132 std::pair
<Signatures::iterator
, bool> ins(
2133 this->signatures_
.insert(std::make_pair(sig
, group
)));
2137 // This is the first time we've seen this signature.
2141 if (ins
.first
->second
)
2143 // We've already seen a real section group with this signature.
2148 // This is a real section group, and we've already seen a
2149 // linkonce section with this signature. Record that we've seen
2150 // a section group, and don't include this section group.
2151 ins
.first
->second
= true;
2156 // We've already seen a linkonce section and this is a linkonce
2157 // section. These don't block each other--this may be the same
2158 // symbol name with different section types.
2163 // Store the allocated sections into the section list.
2166 Layout::get_allocated_sections(Section_list
* section_list
) const
2168 for (Section_list::const_iterator p
= this->section_list_
.begin();
2169 p
!= this->section_list_
.end();
2171 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0)
2172 section_list
->push_back(*p
);
2175 // Create an output segment.
2178 Layout::make_output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
2180 Output_segment
* oseg
= new Output_segment(type
, flags
);
2181 this->segment_list_
.push_back(oseg
);
2185 // Write out the Output_sections. Most won't have anything to write,
2186 // since most of the data will come from input sections which are
2187 // handled elsewhere. But some Output_sections do have Output_data.
2190 Layout::write_output_sections(Output_file
* of
) const
2192 for (Section_list::const_iterator p
= this->section_list_
.begin();
2193 p
!= this->section_list_
.end();
2196 if (!(*p
)->after_input_sections())
2201 // Write out data not associated with a section or the symbol table.
2204 Layout::write_data(const Symbol_table
* symtab
, Output_file
* of
) const
2206 if (!parameters
->strip_all())
2208 const Output_section
* symtab_section
= this->symtab_section_
;
2209 for (Section_list::const_iterator p
= this->section_list_
.begin();
2210 p
!= this->section_list_
.end();
2213 if ((*p
)->needs_symtab_index())
2215 gold_assert(symtab_section
!= NULL
);
2216 unsigned int index
= (*p
)->symtab_index();
2217 gold_assert(index
> 0 && index
!= -1U);
2218 off_t off
= (symtab_section
->offset()
2219 + index
* symtab_section
->entsize());
2220 symtab
->write_section_symbol(*p
, of
, off
);
2225 const Output_section
* dynsym_section
= this->dynsym_section_
;
2226 for (Section_list::const_iterator p
= this->section_list_
.begin();
2227 p
!= this->section_list_
.end();
2230 if ((*p
)->needs_dynsym_index())
2232 gold_assert(dynsym_section
!= NULL
);
2233 unsigned int index
= (*p
)->dynsym_index();
2234 gold_assert(index
> 0 && index
!= -1U);
2235 off_t off
= (dynsym_section
->offset()
2236 + index
* dynsym_section
->entsize());
2237 symtab
->write_section_symbol(*p
, of
, off
);
2241 // Write out the Output_data which are not in an Output_section.
2242 for (Data_list::const_iterator p
= this->special_output_list_
.begin();
2243 p
!= this->special_output_list_
.end();
2248 // Write out the Output_sections which can only be written after the
2249 // input sections are complete.
2252 Layout::write_sections_after_input_sections(Output_file
* of
)
2254 // Determine the final section offsets, and thus the final output
2255 // file size. Note we finalize the .shstrab last, to allow the
2256 // after_input_section sections to modify their section-names before
2258 if (this->any_postprocessing_sections_
)
2260 off_t off
= this->output_file_size_
;
2261 off
= this->set_section_offsets(off
, POSTPROCESSING_SECTIONS_PASS
);
2263 // Now that we've finalized the names, we can finalize the shstrab.
2265 this->set_section_offsets(off
,
2266 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
2268 if (off
> this->output_file_size_
)
2271 this->output_file_size_
= off
;
2275 for (Section_list::const_iterator p
= this->section_list_
.begin();
2276 p
!= this->section_list_
.end();
2279 if ((*p
)->after_input_sections())
2283 this->section_headers_
->write(of
);
2286 // Print statistical information to stderr. This is used for --stats.
2289 Layout::print_stats() const
2291 this->namepool_
.print_stats("section name pool");
2292 this->sympool_
.print_stats("output symbol name pool");
2293 this->dynpool_
.print_stats("dynamic name pool");
2295 for (Section_list::const_iterator p
= this->section_list_
.begin();
2296 p
!= this->section_list_
.end();
2298 (*p
)->print_merge_stats();
2301 // Write_sections_task methods.
2303 // We can always run this task.
2306 Write_sections_task::is_runnable()
2311 // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER
2315 Write_sections_task::locks(Task_locker
* tl
)
2317 tl
->add(this, this->output_sections_blocker_
);
2318 tl
->add(this, this->final_blocker_
);
2321 // Run the task--write out the data.
2324 Write_sections_task::run(Workqueue
*)
2326 this->layout_
->write_output_sections(this->of_
);
2329 // Write_data_task methods.
2331 // We can always run this task.
2334 Write_data_task::is_runnable()
2339 // We need to unlock FINAL_BLOCKER when finished.
2342 Write_data_task::locks(Task_locker
* tl
)
2344 tl
->add(this, this->final_blocker_
);
2347 // Run the task--write out the data.
2350 Write_data_task::run(Workqueue
*)
2352 this->layout_
->write_data(this->symtab_
, this->of_
);
2355 // Write_symbols_task methods.
2357 // We can always run this task.
2360 Write_symbols_task::is_runnable()
2365 // We need to unlock FINAL_BLOCKER when finished.
2368 Write_symbols_task::locks(Task_locker
* tl
)
2370 tl
->add(this, this->final_blocker_
);
2373 // Run the task--write out the symbols.
2376 Write_symbols_task::run(Workqueue
*)
2378 this->symtab_
->write_globals(this->input_objects_
, this->sympool_
,
2379 this->dynpool_
, this->of_
);
2382 // Write_after_input_sections_task methods.
2384 // We can only run this task after the input sections have completed.
2387 Write_after_input_sections_task::is_runnable()
2389 if (this->input_sections_blocker_
->is_blocked())
2390 return this->input_sections_blocker_
;
2394 // We need to unlock FINAL_BLOCKER when finished.
2397 Write_after_input_sections_task::locks(Task_locker
* tl
)
2399 tl
->add(this, this->final_blocker_
);
2405 Write_after_input_sections_task::run(Workqueue
*)
2407 this->layout_
->write_sections_after_input_sections(this->of_
);
2410 // Close_task_runner methods.
2412 // Run the task--close the file.
2415 Close_task_runner::run(Workqueue
*, const Task
*)
2420 // Instantiate the templates we need. We could use the configure
2421 // script to restrict this to only the ones for implemented targets.
2423 #ifdef HAVE_TARGET_32_LITTLE
2426 Layout::layout
<32, false>(Sized_relobj
<32, false>* object
, unsigned int shndx
,
2428 const elfcpp::Shdr
<32, false>& shdr
,
2429 unsigned int, unsigned int, off_t
*);
2432 #ifdef HAVE_TARGET_32_BIG
2435 Layout::layout
<32, true>(Sized_relobj
<32, true>* object
, unsigned int shndx
,
2437 const elfcpp::Shdr
<32, true>& shdr
,
2438 unsigned int, unsigned int, off_t
*);
2441 #ifdef HAVE_TARGET_64_LITTLE
2444 Layout::layout
<64, false>(Sized_relobj
<64, false>* object
, unsigned int shndx
,
2446 const elfcpp::Shdr
<64, false>& shdr
,
2447 unsigned int, unsigned int, off_t
*);
2450 #ifdef HAVE_TARGET_64_BIG
2453 Layout::layout
<64, true>(Sized_relobj
<64, true>* object
, unsigned int shndx
,
2455 const elfcpp::Shdr
<64, true>& shdr
,
2456 unsigned int, unsigned int, off_t
*);
2459 #ifdef HAVE_TARGET_32_LITTLE
2462 Layout::layout_eh_frame
<32, false>(Sized_relobj
<32, false>* object
,
2463 const unsigned char* symbols
,
2465 const unsigned char* symbol_names
,
2466 off_t symbol_names_size
,
2468 const elfcpp::Shdr
<32, false>& shdr
,
2469 unsigned int reloc_shndx
,
2470 unsigned int reloc_type
,
2474 #ifdef HAVE_TARGET_32_BIG
2477 Layout::layout_eh_frame
<32, true>(Sized_relobj
<32, true>* object
,
2478 const unsigned char* symbols
,
2480 const unsigned char* symbol_names
,
2481 off_t symbol_names_size
,
2483 const elfcpp::Shdr
<32, true>& shdr
,
2484 unsigned int reloc_shndx
,
2485 unsigned int reloc_type
,
2489 #ifdef HAVE_TARGET_64_LITTLE
2492 Layout::layout_eh_frame
<64, false>(Sized_relobj
<64, false>* object
,
2493 const unsigned char* symbols
,
2495 const unsigned char* symbol_names
,
2496 off_t symbol_names_size
,
2498 const elfcpp::Shdr
<64, false>& shdr
,
2499 unsigned int reloc_shndx
,
2500 unsigned int reloc_type
,
2504 #ifdef HAVE_TARGET_64_BIG
2507 Layout::layout_eh_frame
<64, true>(Sized_relobj
<64, true>* object
,
2508 const unsigned char* symbols
,
2510 const unsigned char* symbol_names
,
2511 off_t symbol_names_size
,
2513 const elfcpp::Shdr
<64, true>& shdr
,
2514 unsigned int reloc_shndx
,
2515 unsigned int reloc_type
,
2519 } // End namespace gold.