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.
32 #include "libiberty.h"
36 #include "parameters.h"
39 #include "script-sections.h"
44 #include "compressed_output.h"
51 // Layout_task_runner methods.
53 // Lay out the sections. This is called after all the input objects
57 Layout_task_runner::run(Workqueue
* workqueue
, const Task
* task
)
59 off_t file_size
= this->layout_
->finalize(this->input_objects_
,
64 // Now we know the final size of the output file and we know where
65 // each piece of information goes.
66 Output_file
* of
= new Output_file(parameters
->options().output_file_name());
67 if (this->options_
.oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
68 of
->set_is_temporary();
71 // Queue up the final set of tasks.
72 gold::queue_final_tasks(this->options_
, this->input_objects_
,
73 this->symtab_
, this->layout_
, workqueue
, of
);
78 Layout::Layout(const General_options
& options
, Script_options
* script_options
)
80 script_options_(script_options
),
88 unattached_section_list_(),
89 sections_are_attached_(false),
90 special_output_list_(),
91 section_headers_(NULL
),
93 symtab_section_(NULL
),
95 dynsym_section_(NULL
),
97 dynamic_section_(NULL
),
99 eh_frame_section_(NULL
),
100 eh_frame_data_(NULL
),
101 added_eh_frame_data_(false),
102 eh_frame_hdr_section_(NULL
),
103 build_id_note_(NULL
),
105 output_file_size_(-1),
106 input_requires_executable_stack_(false),
107 input_with_gnu_stack_note_(false),
108 input_without_gnu_stack_note_(false),
109 has_static_tls_(false),
110 any_postprocessing_sections_(false)
112 // Make space for more than enough segments for a typical file.
113 // This is just for efficiency--it's OK if we wind up needing more.
114 this->segment_list_
.reserve(12);
116 // We expect two unattached Output_data objects: the file header and
117 // the segment headers.
118 this->special_output_list_
.reserve(2);
121 // Hash a key we use to look up an output section mapping.
124 Layout::Hash_key::operator()(const Layout::Key
& k
) const
126 return k
.first
+ k
.second
.first
+ k
.second
.second
;
129 // Return whether PREFIX is a prefix of STR.
132 is_prefix_of(const char* prefix
, const char* str
)
134 return strncmp(prefix
, str
, strlen(prefix
)) == 0;
137 // Returns whether the given section is in the list of
138 // debug-sections-used-by-some-version-of-gdb. Currently,
139 // we've checked versions of gdb up to and including 6.7.1.
141 static const char* gdb_sections
[] =
143 // ".debug_aranges", // not used by gdb as of 6.7.1
149 // ".debug_pubnames", // not used by gdb as of 6.7.1
155 is_gdb_debug_section(const char* str
)
157 // We can do this faster: binary search or a hashtable. But why bother?
158 for (size_t i
= 0; i
< sizeof(gdb_sections
)/sizeof(*gdb_sections
); ++i
)
159 if (strcmp(str
, gdb_sections
[i
]) == 0)
164 // Whether to include this section in the link.
166 template<int size
, bool big_endian
>
168 Layout::include_section(Sized_relobj
<size
, big_endian
>*, const char* name
,
169 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
171 switch (shdr
.get_sh_type())
173 case elfcpp::SHT_NULL
:
174 case elfcpp::SHT_SYMTAB
:
175 case elfcpp::SHT_DYNSYM
:
176 case elfcpp::SHT_STRTAB
:
177 case elfcpp::SHT_HASH
:
178 case elfcpp::SHT_DYNAMIC
:
179 case elfcpp::SHT_SYMTAB_SHNDX
:
182 case elfcpp::SHT_RELA
:
183 case elfcpp::SHT_REL
:
184 case elfcpp::SHT_GROUP
:
185 // If we are emitting relocations these should be handled
187 gold_assert(!parameters
->options().relocatable()
188 && !parameters
->options().emit_relocs());
191 case elfcpp::SHT_PROGBITS
:
192 if (parameters
->options().strip_debug()
193 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
195 if (is_debug_info_section(name
))
198 if (parameters
->options().strip_debug_gdb()
199 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
201 // Debugging sections can only be recognized by name.
202 if (is_prefix_of(".debug", name
)
203 && !is_gdb_debug_section(name
))
213 // Return an output section named NAME, or NULL if there is none.
216 Layout::find_output_section(const char* name
) const
218 for (Section_list::const_iterator p
= this->section_list_
.begin();
219 p
!= this->section_list_
.end();
221 if (strcmp((*p
)->name(), name
) == 0)
226 // Return an output segment of type TYPE, with segment flags SET set
227 // and segment flags CLEAR clear. Return NULL if there is none.
230 Layout::find_output_segment(elfcpp::PT type
, elfcpp::Elf_Word set
,
231 elfcpp::Elf_Word clear
) const
233 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
234 p
!= this->segment_list_
.end();
236 if (static_cast<elfcpp::PT
>((*p
)->type()) == type
237 && ((*p
)->flags() & set
) == set
238 && ((*p
)->flags() & clear
) == 0)
243 // Return the output section to use for section NAME with type TYPE
244 // and section flags FLAGS. NAME must be canonicalized in the string
245 // pool, and NAME_KEY is the key.
248 Layout::get_output_section(const char* name
, Stringpool::Key name_key
,
249 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
)
251 elfcpp::Elf_Xword lookup_flags
= flags
;
253 // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine
254 // read-write with read-only sections. Some other ELF linkers do
255 // not do this. FIXME: Perhaps there should be an option
257 lookup_flags
&= ~(elfcpp::SHF_WRITE
| elfcpp::SHF_EXECINSTR
);
259 const Key
key(name_key
, std::make_pair(type
, lookup_flags
));
260 const std::pair
<Key
, Output_section
*> v(key
, NULL
);
261 std::pair
<Section_name_map::iterator
, bool> ins(
262 this->section_name_map_
.insert(v
));
265 return ins
.first
->second
;
268 // This is the first time we've seen this name/type/flags
269 // combination. For compatibility with the GNU linker, we
270 // combine sections with contents and zero flags with sections
271 // with non-zero flags. This is a workaround for cases where
272 // assembler code forgets to set section flags. FIXME: Perhaps
273 // there should be an option to control this.
274 Output_section
* os
= NULL
;
276 if (type
== elfcpp::SHT_PROGBITS
)
280 Output_section
* same_name
= this->find_output_section(name
);
281 if (same_name
!= NULL
282 && same_name
->type() == elfcpp::SHT_PROGBITS
283 && (same_name
->flags() & elfcpp::SHF_TLS
) == 0)
286 else if ((flags
& elfcpp::SHF_TLS
) == 0)
288 elfcpp::Elf_Xword zero_flags
= 0;
289 const Key
zero_key(name_key
, std::make_pair(type
, zero_flags
));
290 Section_name_map::iterator p
=
291 this->section_name_map_
.find(zero_key
);
292 if (p
!= this->section_name_map_
.end())
298 os
= this->make_output_section(name
, type
, flags
);
299 ins
.first
->second
= os
;
304 // Pick the output section to use for section NAME, in input file
305 // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a
306 // linker created section. IS_INPUT_SECTION is true if we are
307 // choosing an output section for an input section found in a input
308 // file. This will return NULL if the input section should be
312 Layout::choose_output_section(const Relobj
* relobj
, const char* name
,
313 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
,
314 bool is_input_section
)
316 // We should not see any input sections after we have attached
317 // sections to segments.
318 gold_assert(!is_input_section
|| !this->sections_are_attached_
);
320 // Some flags in the input section should not be automatically
321 // copied to the output section.
322 flags
&= ~ (elfcpp::SHF_INFO_LINK
323 | elfcpp::SHF_LINK_ORDER
326 | elfcpp::SHF_STRINGS
);
328 if (this->script_options_
->saw_sections_clause())
330 // We are using a SECTIONS clause, so the output section is
331 // chosen based only on the name.
333 Script_sections
* ss
= this->script_options_
->script_sections();
334 const char* file_name
= relobj
== NULL
? NULL
: relobj
->name().c_str();
335 Output_section
** output_section_slot
;
336 name
= ss
->output_section_name(file_name
, name
, &output_section_slot
);
339 // The SECTIONS clause says to discard this input section.
343 // If this is an orphan section--one not mentioned in the linker
344 // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the
345 // default processing below.
347 if (output_section_slot
!= NULL
)
349 if (*output_section_slot
!= NULL
)
350 return *output_section_slot
;
352 // We don't put sections found in the linker script into
353 // SECTION_NAME_MAP_. That keeps us from getting confused
354 // if an orphan section is mapped to a section with the same
355 // name as one in the linker script.
357 name
= this->namepool_
.add(name
, false, NULL
);
359 Output_section
* os
= this->make_output_section(name
, type
, flags
);
360 os
->set_found_in_sections_clause();
361 *output_section_slot
= os
;
366 // FIXME: Handle SHF_OS_NONCONFORMING somewhere.
368 // Turn NAME from the name of the input section into the name of the
371 size_t len
= strlen(name
);
372 if (is_input_section
&& !parameters
->options().relocatable())
373 name
= Layout::output_section_name(name
, &len
);
375 Stringpool::Key name_key
;
376 name
= this->namepool_
.add_with_length(name
, len
, true, &name_key
);
378 // Find or make the output section. The output section is selected
379 // based on the section name, type, and flags.
380 return this->get_output_section(name
, name_key
, type
, flags
);
383 // Return the output section to use for input section SHNDX, with name
384 // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the
385 // index of a relocation section which applies to this section, or 0
386 // if none, or -1U if more than one. RELOC_TYPE is the type of the
387 // relocation section if there is one. Set *OFF to the offset of this
388 // input section without the output section. Return NULL if the
389 // section should be discarded. Set *OFF to -1 if the section
390 // contents should not be written directly to the output file, but
391 // will instead receive special handling.
393 template<int size
, bool big_endian
>
395 Layout::layout(Sized_relobj
<size
, big_endian
>* object
, unsigned int shndx
,
396 const char* name
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
397 unsigned int reloc_shndx
, unsigned int, off_t
* off
)
399 if (!this->include_section(object
, name
, shdr
))
404 // In a relocatable link a grouped section must not be combined with
405 // any other sections.
406 if (parameters
->options().relocatable()
407 && (shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) != 0)
409 name
= this->namepool_
.add(name
, true, NULL
);
410 os
= this->make_output_section(name
, shdr
.get_sh_type(),
411 shdr
.get_sh_flags());
415 os
= this->choose_output_section(object
, name
, shdr
.get_sh_type(),
416 shdr
.get_sh_flags(), true);
421 // By default the GNU linker sorts input sections whose names match
422 // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections
423 // are sorted by name. This is used to implement constructor
424 // priority ordering. We are compatible.
425 if (!this->script_options_
->saw_sections_clause()
426 && (is_prefix_of(".ctors.", name
)
427 || is_prefix_of(".dtors.", name
)
428 || is_prefix_of(".init_array.", name
)
429 || is_prefix_of(".fini_array.", name
)))
430 os
->set_must_sort_attached_input_sections();
432 // FIXME: Handle SHF_LINK_ORDER somewhere.
434 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
435 this->script_options_
->saw_sections_clause());
440 // Handle a relocation section when doing a relocatable link.
442 template<int size
, bool big_endian
>
444 Layout::layout_reloc(Sized_relobj
<size
, big_endian
>* object
,
446 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
447 Output_section
* data_section
,
448 Relocatable_relocs
* rr
)
450 gold_assert(parameters
->options().relocatable()
451 || parameters
->options().emit_relocs());
453 int sh_type
= shdr
.get_sh_type();
456 if (sh_type
== elfcpp::SHT_REL
)
458 else if (sh_type
== elfcpp::SHT_RELA
)
462 name
+= data_section
->name();
464 Output_section
* os
= this->choose_output_section(object
, name
.c_str(),
469 os
->set_should_link_to_symtab();
470 os
->set_info_section(data_section
);
472 Output_section_data
* posd
;
473 if (sh_type
== elfcpp::SHT_REL
)
475 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
476 posd
= new Output_relocatable_relocs
<elfcpp::SHT_REL
,
480 else if (sh_type
== elfcpp::SHT_RELA
)
482 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
483 posd
= new Output_relocatable_relocs
<elfcpp::SHT_RELA
,
490 os
->add_output_section_data(posd
);
491 rr
->set_output_data(posd
);
496 // Handle a group section when doing a relocatable link.
498 template<int size
, bool big_endian
>
500 Layout::layout_group(Symbol_table
* symtab
,
501 Sized_relobj
<size
, big_endian
>* object
,
503 const char* group_section_name
,
504 const char* signature
,
505 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
506 const elfcpp::Elf_Word
* contents
)
508 gold_assert(parameters
->options().relocatable());
509 gold_assert(shdr
.get_sh_type() == elfcpp::SHT_GROUP
);
510 group_section_name
= this->namepool_
.add(group_section_name
, true, NULL
);
511 Output_section
* os
= this->make_output_section(group_section_name
,
513 shdr
.get_sh_flags());
515 // We need to find a symbol with the signature in the symbol table.
516 // If we don't find one now, we need to look again later.
517 Symbol
* sym
= symtab
->lookup(signature
, NULL
);
519 os
->set_info_symndx(sym
);
522 // We will wind up using a symbol whose name is the signature.
523 // So just put the signature in the symbol name pool to save it.
524 signature
= symtab
->canonicalize_name(signature
);
525 this->group_signatures_
.push_back(Group_signature(os
, signature
));
528 os
->set_should_link_to_symtab();
531 section_size_type entry_count
=
532 convert_to_section_size_type(shdr
.get_sh_size() / 4);
533 Output_section_data
* posd
=
534 new Output_data_group
<size
, big_endian
>(object
, entry_count
, contents
);
535 os
->add_output_section_data(posd
);
538 // Special GNU handling of sections name .eh_frame. They will
539 // normally hold exception frame data as defined by the C++ ABI
540 // (http://codesourcery.com/cxx-abi/).
542 template<int size
, bool big_endian
>
544 Layout::layout_eh_frame(Sized_relobj
<size
, big_endian
>* object
,
545 const unsigned char* symbols
,
547 const unsigned char* symbol_names
,
548 off_t symbol_names_size
,
550 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
551 unsigned int reloc_shndx
, unsigned int reloc_type
,
554 gold_assert(shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
);
555 gold_assert((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
557 const char* const name
= ".eh_frame";
558 Output_section
* os
= this->choose_output_section(object
,
560 elfcpp::SHT_PROGBITS
,
566 if (this->eh_frame_section_
== NULL
)
568 this->eh_frame_section_
= os
;
569 this->eh_frame_data_
= new Eh_frame();
571 if (this->options_
.eh_frame_hdr())
573 Output_section
* hdr_os
=
574 this->choose_output_section(NULL
,
576 elfcpp::SHT_PROGBITS
,
582 Eh_frame_hdr
* hdr_posd
= new Eh_frame_hdr(os
,
583 this->eh_frame_data_
);
584 hdr_os
->add_output_section_data(hdr_posd
);
586 hdr_os
->set_after_input_sections();
588 if (!this->script_options_
->saw_phdrs_clause())
590 Output_segment
* hdr_oseg
;
591 hdr_oseg
= this->make_output_segment(elfcpp::PT_GNU_EH_FRAME
,
593 hdr_oseg
->add_output_section(hdr_os
, elfcpp::PF_R
);
596 this->eh_frame_data_
->set_eh_frame_hdr(hdr_posd
);
601 gold_assert(this->eh_frame_section_
== os
);
603 if (this->eh_frame_data_
->add_ehframe_input_section(object
,
612 os
->update_flags_for_input_section(shdr
.get_sh_flags());
614 // We found a .eh_frame section we are going to optimize, so now
615 // we can add the set of optimized sections to the output
616 // section. We need to postpone adding this until we've found a
617 // section we can optimize so that the .eh_frame section in
618 // crtbegin.o winds up at the start of the output section.
619 if (!this->added_eh_frame_data_
)
621 os
->add_output_section_data(this->eh_frame_data_
);
622 this->added_eh_frame_data_
= true;
628 // We couldn't handle this .eh_frame section for some reason.
629 // Add it as a normal section.
630 bool saw_sections_clause
= this->script_options_
->saw_sections_clause();
631 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
632 saw_sections_clause
);
638 // Add POSD to an output section using NAME, TYPE, and FLAGS.
641 Layout::add_output_section_data(const char* name
, elfcpp::Elf_Word type
,
642 elfcpp::Elf_Xword flags
,
643 Output_section_data
* posd
)
645 Output_section
* os
= this->choose_output_section(NULL
, name
, type
, flags
,
648 os
->add_output_section_data(posd
);
651 // Map section flags to segment flags.
654 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags
)
656 elfcpp::Elf_Word ret
= elfcpp::PF_R
;
657 if ((flags
& elfcpp::SHF_WRITE
) != 0)
659 if ((flags
& elfcpp::SHF_EXECINSTR
) != 0)
664 // Sometimes we compress sections. This is typically done for
665 // sections that are not part of normal program execution (such as
666 // .debug_* sections), and where the readers of these sections know
667 // how to deal with compressed sections. (To make it easier for them,
668 // we will rename the ouput section in such cases from .foo to
669 // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine
670 // doesn't say for certain whether we'll compress -- it depends on
671 // commandline options as well -- just whether this section is a
672 // candidate for compression.
675 is_compressible_debug_section(const char* secname
)
677 return (strncmp(secname
, ".debug", sizeof(".debug") - 1) == 0);
680 // Make a new Output_section, and attach it to segments as
684 Layout::make_output_section(const char* name
, elfcpp::Elf_Word type
,
685 elfcpp::Elf_Xword flags
)
688 if ((flags
& elfcpp::SHF_ALLOC
) == 0
689 && strcmp(this->options_
.compress_debug_sections(), "none") != 0
690 && is_compressible_debug_section(name
))
691 os
= new Output_compressed_section(&this->options_
, name
, type
, flags
);
693 os
= new Output_section(name
, type
, flags
);
695 this->section_list_
.push_back(os
);
697 // The GNU linker by default sorts some sections by priority, so we
698 // do the same. We need to know that this might happen before we
699 // attach any input sections.
700 if (!this->script_options_
->saw_sections_clause()
701 && (strcmp(name
, ".ctors") == 0
702 || strcmp(name
, ".dtors") == 0
703 || strcmp(name
, ".init_array") == 0
704 || strcmp(name
, ".fini_array") == 0))
705 os
->set_may_sort_attached_input_sections();
707 // If we have already attached the sections to segments, then we
708 // need to attach this one now. This happens for sections created
709 // directly by the linker.
710 if (this->sections_are_attached_
)
711 this->attach_section_to_segment(os
);
716 // Attach output sections to segments. This is called after we have
717 // seen all the input sections.
720 Layout::attach_sections_to_segments()
722 for (Section_list::iterator p
= this->section_list_
.begin();
723 p
!= this->section_list_
.end();
725 this->attach_section_to_segment(*p
);
727 this->sections_are_attached_
= true;
730 // Attach an output section to a segment.
733 Layout::attach_section_to_segment(Output_section
* os
)
735 if ((os
->flags() & elfcpp::SHF_ALLOC
) == 0)
736 this->unattached_section_list_
.push_back(os
);
738 this->attach_allocated_section_to_segment(os
);
741 // Attach an allocated output section to a segment.
744 Layout::attach_allocated_section_to_segment(Output_section
* os
)
746 elfcpp::Elf_Xword flags
= os
->flags();
747 gold_assert((flags
& elfcpp::SHF_ALLOC
) != 0);
749 if (parameters
->options().relocatable())
752 // If we have a SECTIONS clause, we can't handle the attachment to
753 // segments until after we've seen all the sections.
754 if (this->script_options_
->saw_sections_clause())
757 gold_assert(!this->script_options_
->saw_phdrs_clause());
759 // This output section goes into a PT_LOAD segment.
761 elfcpp::Elf_Word seg_flags
= Layout::section_flags_to_segment(flags
);
763 // In general the only thing we really care about for PT_LOAD
764 // segments is whether or not they are writable, so that is how we
765 // search for them. People who need segments sorted on some other
766 // basis will have to use a linker script.
768 Segment_list::const_iterator p
;
769 for (p
= this->segment_list_
.begin();
770 p
!= this->segment_list_
.end();
773 if ((*p
)->type() == elfcpp::PT_LOAD
774 && ((*p
)->flags() & elfcpp::PF_W
) == (seg_flags
& elfcpp::PF_W
))
776 // If -Tbss was specified, we need to separate the data
778 if (this->options_
.user_set_Tbss())
780 if ((os
->type() == elfcpp::SHT_NOBITS
)
781 == (*p
)->has_any_data_sections())
785 (*p
)->add_output_section(os
, seg_flags
);
790 if (p
== this->segment_list_
.end())
792 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_LOAD
,
794 oseg
->add_output_section(os
, seg_flags
);
797 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
799 if (os
->type() == elfcpp::SHT_NOTE
)
801 // See if we already have an equivalent PT_NOTE segment.
802 for (p
= this->segment_list_
.begin();
803 p
!= segment_list_
.end();
806 if ((*p
)->type() == elfcpp::PT_NOTE
807 && (((*p
)->flags() & elfcpp::PF_W
)
808 == (seg_flags
& elfcpp::PF_W
)))
810 (*p
)->add_output_section(os
, seg_flags
);
815 if (p
== this->segment_list_
.end())
817 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_NOTE
,
819 oseg
->add_output_section(os
, seg_flags
);
823 // If we see a loadable SHF_TLS section, we create a PT_TLS
824 // segment. There can only be one such segment.
825 if ((flags
& elfcpp::SHF_TLS
) != 0)
827 if (this->tls_segment_
== NULL
)
828 this->tls_segment_
= this->make_output_segment(elfcpp::PT_TLS
,
830 this->tls_segment_
->add_output_section(os
, seg_flags
);
834 // Make an output section for a script.
837 Layout::make_output_section_for_script(const char* name
)
839 name
= this->namepool_
.add(name
, false, NULL
);
840 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_PROGBITS
,
842 os
->set_found_in_sections_clause();
846 // Return the number of segments we expect to see.
849 Layout::expected_segment_count() const
851 size_t ret
= this->segment_list_
.size();
853 // If we didn't see a SECTIONS clause in a linker script, we should
854 // already have the complete list of segments. Otherwise we ask the
855 // SECTIONS clause how many segments it expects, and add in the ones
856 // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.)
858 if (!this->script_options_
->saw_sections_clause())
862 const Script_sections
* ss
= this->script_options_
->script_sections();
863 return ret
+ ss
->expected_segment_count(this);
867 // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK
868 // is whether we saw a .note.GNU-stack section in the object file.
869 // GNU_STACK_FLAGS is the section flags. The flags give the
870 // protection required for stack memory. We record this in an
871 // executable as a PT_GNU_STACK segment. If an object file does not
872 // have a .note.GNU-stack segment, we must assume that it is an old
873 // object. On some targets that will force an executable stack.
876 Layout::layout_gnu_stack(bool seen_gnu_stack
, uint64_t gnu_stack_flags
)
879 this->input_without_gnu_stack_note_
= true;
882 this->input_with_gnu_stack_note_
= true;
883 if ((gnu_stack_flags
& elfcpp::SHF_EXECINSTR
) != 0)
884 this->input_requires_executable_stack_
= true;
888 // Create the dynamic sections which are needed before we read the
892 Layout::create_initial_dynamic_sections(Symbol_table
* symtab
)
894 if (parameters
->doing_static_link())
897 this->dynamic_section_
= this->choose_output_section(NULL
, ".dynamic",
900 | elfcpp::SHF_WRITE
),
903 symtab
->define_in_output_data("_DYNAMIC", NULL
, this->dynamic_section_
, 0, 0,
904 elfcpp::STT_OBJECT
, elfcpp::STB_LOCAL
,
905 elfcpp::STV_HIDDEN
, 0, false, false);
907 this->dynamic_data_
= new Output_data_dynamic(&this->dynpool_
);
909 this->dynamic_section_
->add_output_section_data(this->dynamic_data_
);
912 // For each output section whose name can be represented as C symbol,
913 // define __start and __stop symbols for the section. This is a GNU
917 Layout::define_section_symbols(Symbol_table
* symtab
)
919 for (Section_list::const_iterator p
= this->section_list_
.begin();
920 p
!= this->section_list_
.end();
923 const char* const name
= (*p
)->name();
924 if (name
[strspn(name
,
926 "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
927 "abcdefghijklmnopqrstuvwxyz"
931 const std::string
name_string(name
);
932 const std::string
start_name("__start_" + name_string
);
933 const std::string
stop_name("__stop_" + name_string
);
935 symtab
->define_in_output_data(start_name
.c_str(),
944 false, // offset_is_from_end
945 true); // only_if_ref
947 symtab
->define_in_output_data(stop_name
.c_str(),
956 true, // offset_is_from_end
957 true); // only_if_ref
962 // Define symbols for group signatures.
965 Layout::define_group_signatures(Symbol_table
* symtab
)
967 for (Group_signatures::iterator p
= this->group_signatures_
.begin();
968 p
!= this->group_signatures_
.end();
971 Symbol
* sym
= symtab
->lookup(p
->signature
, NULL
);
973 p
->section
->set_info_symndx(sym
);
976 // Force the name of the group section to the group
977 // signature, and use the group's section symbol as the
979 if (strcmp(p
->section
->name(), p
->signature
) != 0)
981 const char* name
= this->namepool_
.add(p
->signature
,
983 p
->section
->set_name(name
);
985 p
->section
->set_needs_symtab_index();
986 p
->section
->set_info_section_symndx(p
->section
);
990 this->group_signatures_
.clear();
993 // Find the first read-only PT_LOAD segment, creating one if
997 Layout::find_first_load_seg()
999 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
1000 p
!= this->segment_list_
.end();
1003 if ((*p
)->type() == elfcpp::PT_LOAD
1004 && ((*p
)->flags() & elfcpp::PF_R
) != 0
1005 && ((*p
)->flags() & elfcpp::PF_W
) == 0)
1009 gold_assert(!this->script_options_
->saw_phdrs_clause());
1011 Output_segment
* load_seg
= this->make_output_segment(elfcpp::PT_LOAD
,
1016 // Finalize the layout. When this is called, we have created all the
1017 // output sections and all the output segments which are based on
1018 // input sections. We have several things to do, and we have to do
1019 // them in the right order, so that we get the right results correctly
1022 // 1) Finalize the list of output segments and create the segment
1025 // 2) Finalize the dynamic symbol table and associated sections.
1027 // 3) Determine the final file offset of all the output segments.
1029 // 4) Determine the final file offset of all the SHF_ALLOC output
1032 // 5) Create the symbol table sections and the section name table
1035 // 6) Finalize the symbol table: set symbol values to their final
1036 // value and make a final determination of which symbols are going
1037 // into the output symbol table.
1039 // 7) Create the section table header.
1041 // 8) Determine the final file offset of all the output sections which
1042 // are not SHF_ALLOC, including the section table header.
1044 // 9) Finalize the ELF file header.
1046 // This function returns the size of the output file.
1049 Layout::finalize(const Input_objects
* input_objects
, Symbol_table
* symtab
,
1050 Target
* target
, const Task
* task
)
1052 target
->finalize_sections(this);
1054 this->count_local_symbols(task
, input_objects
);
1056 this->create_gold_note();
1057 this->create_executable_stack_info(target
);
1058 this->create_build_id();
1060 Output_segment
* phdr_seg
= NULL
;
1061 if (!parameters
->options().relocatable() && !parameters
->doing_static_link())
1063 // There was a dynamic object in the link. We need to create
1064 // some information for the dynamic linker.
1066 // Create the PT_PHDR segment which will hold the program
1068 if (!this->script_options_
->saw_phdrs_clause())
1069 phdr_seg
= this->make_output_segment(elfcpp::PT_PHDR
, elfcpp::PF_R
);
1071 // Create the dynamic symbol table, including the hash table.
1072 Output_section
* dynstr
;
1073 std::vector
<Symbol
*> dynamic_symbols
;
1074 unsigned int local_dynamic_count
;
1075 Versions
versions(*this->script_options()->version_script_info(),
1077 this->create_dynamic_symtab(input_objects
, symtab
, &dynstr
,
1078 &local_dynamic_count
, &dynamic_symbols
,
1081 // Create the .interp section to hold the name of the
1082 // interpreter, and put it in a PT_INTERP segment.
1083 if (!parameters
->options().shared())
1084 this->create_interp(target
);
1086 // Finish the .dynamic section to hold the dynamic data, and put
1087 // it in a PT_DYNAMIC segment.
1088 this->finish_dynamic_section(input_objects
, symtab
);
1090 // We should have added everything we need to the dynamic string
1092 this->dynpool_
.set_string_offsets();
1094 // Create the version sections. We can't do this until the
1095 // dynamic string table is complete.
1096 this->create_version_sections(&versions
, symtab
, local_dynamic_count
,
1097 dynamic_symbols
, dynstr
);
1100 // If there is a SECTIONS clause, put all the input sections into
1101 // the required order.
1102 Output_segment
* load_seg
;
1103 if (this->script_options_
->saw_sections_clause())
1104 load_seg
= this->set_section_addresses_from_script(symtab
);
1105 else if (parameters
->options().relocatable())
1108 load_seg
= this->find_first_load_seg();
1110 if (this->options_
.oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
1113 gold_assert(phdr_seg
== NULL
|| load_seg
!= NULL
);
1115 // Lay out the segment headers.
1116 Output_segment_headers
* segment_headers
;
1117 if (parameters
->options().relocatable())
1118 segment_headers
= NULL
;
1121 segment_headers
= new Output_segment_headers(this->segment_list_
);
1122 if (load_seg
!= NULL
)
1123 load_seg
->add_initial_output_data(segment_headers
);
1124 if (phdr_seg
!= NULL
)
1125 phdr_seg
->add_initial_output_data(segment_headers
);
1128 // Lay out the file header.
1129 Output_file_header
* file_header
;
1130 file_header
= new Output_file_header(target
, symtab
, segment_headers
,
1131 this->options_
.entry());
1132 if (load_seg
!= NULL
)
1133 load_seg
->add_initial_output_data(file_header
);
1135 this->special_output_list_
.push_back(file_header
);
1136 if (segment_headers
!= NULL
)
1137 this->special_output_list_
.push_back(segment_headers
);
1139 if (this->script_options_
->saw_phdrs_clause()
1140 && !parameters
->options().relocatable())
1142 // Support use of FILEHDRS and PHDRS attachments in a PHDRS
1143 // clause in a linker script.
1144 Script_sections
* ss
= this->script_options_
->script_sections();
1145 ss
->put_headers_in_phdrs(file_header
, segment_headers
);
1148 // We set the output section indexes in set_segment_offsets and
1149 // set_section_indexes.
1150 unsigned int shndx
= 1;
1152 // Set the file offsets of all the segments, and all the sections
1155 if (!parameters
->options().relocatable())
1156 off
= this->set_segment_offsets(target
, load_seg
, &shndx
);
1158 off
= this->set_relocatable_section_offsets(file_header
, &shndx
);
1160 // Set the file offsets of all the non-data sections we've seen so
1161 // far which don't have to wait for the input sections. We need
1162 // this in order to finalize local symbols in non-allocated
1164 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
1166 // Set the section indexes of all unallocated sections seen so far,
1167 // in case any of them are somehow referenced by a symbol.
1168 shndx
= this->set_section_indexes(shndx
);
1170 // Create the symbol table sections.
1171 this->create_symtab_sections(input_objects
, symtab
, shndx
, &off
);
1172 if (!parameters
->doing_static_link())
1173 this->assign_local_dynsym_offsets(input_objects
);
1175 // Process any symbol assignments from a linker script. This must
1176 // be called after the symbol table has been finalized.
1177 this->script_options_
->finalize_symbols(symtab
, this);
1179 // Create the .shstrtab section.
1180 Output_section
* shstrtab_section
= this->create_shstrtab();
1182 // Set the file offsets of the rest of the non-data sections which
1183 // don't have to wait for the input sections.
1184 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
1186 // Now that all sections have been created, set the section indexes
1187 // for any sections which haven't been done yet.
1188 shndx
= this->set_section_indexes(shndx
);
1190 // Create the section table header.
1191 this->create_shdrs(shstrtab_section
, &off
);
1193 // If there are no sections which require postprocessing, we can
1194 // handle the section names now, and avoid a resize later.
1195 if (!this->any_postprocessing_sections_
)
1196 off
= this->set_section_offsets(off
,
1197 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
1199 file_header
->set_section_info(this->section_headers_
, shstrtab_section
);
1201 // Now we know exactly where everything goes in the output file
1202 // (except for non-allocated sections which require postprocessing).
1203 Output_data::layout_complete();
1205 this->output_file_size_
= off
;
1210 // Create a note header following the format defined in the ELF ABI.
1211 // NAME is the name, NOTE_TYPE is the type, DESCSZ is the size of the
1212 // descriptor. ALLOCATE is true if the section should be allocated in
1213 // memory. This returns the new note section. It sets
1214 // *TRAILING_PADDING to the number of trailing zero bytes required.
1217 Layout::create_note(const char* name
, int note_type
, size_t descsz
,
1218 bool allocate
, size_t* trailing_padding
)
1220 // Authorities all agree that the values in a .note field should
1221 // be aligned on 4-byte boundaries for 32-bit binaries. However,
1222 // they differ on what the alignment is for 64-bit binaries.
1223 // The GABI says unambiguously they take 8-byte alignment:
1224 // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section
1225 // Other documentation says alignment should always be 4 bytes:
1226 // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format
1227 // GNU ld and GNU readelf both support the latter (at least as of
1228 // version 2.16.91), and glibc always generates the latter for
1229 // .note.ABI-tag (as of version 1.6), so that's the one we go with
1231 #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default.
1232 const int size
= parameters
->target().get_size();
1234 const int size
= 32;
1237 // The contents of the .note section.
1238 size_t namesz
= strlen(name
) + 1;
1239 size_t aligned_namesz
= align_address(namesz
, size
/ 8);
1240 size_t aligned_descsz
= align_address(descsz
, size
/ 8);
1242 size_t notehdrsz
= 3 * (size
/ 8) + aligned_namesz
;
1244 unsigned char* buffer
= new unsigned char[notehdrsz
];
1245 memset(buffer
, 0, notehdrsz
);
1247 bool is_big_endian
= parameters
->target().is_big_endian();
1253 elfcpp::Swap
<32, false>::writeval(buffer
, namesz
);
1254 elfcpp::Swap
<32, false>::writeval(buffer
+ 4, descsz
);
1255 elfcpp::Swap
<32, false>::writeval(buffer
+ 8, note_type
);
1259 elfcpp::Swap
<32, true>::writeval(buffer
, namesz
);
1260 elfcpp::Swap
<32, true>::writeval(buffer
+ 4, descsz
);
1261 elfcpp::Swap
<32, true>::writeval(buffer
+ 8, note_type
);
1264 else if (size
== 64)
1268 elfcpp::Swap
<64, false>::writeval(buffer
, namesz
);
1269 elfcpp::Swap
<64, false>::writeval(buffer
+ 8, descsz
);
1270 elfcpp::Swap
<64, false>::writeval(buffer
+ 16, note_type
);
1274 elfcpp::Swap
<64, true>::writeval(buffer
, namesz
);
1275 elfcpp::Swap
<64, true>::writeval(buffer
+ 8, descsz
);
1276 elfcpp::Swap
<64, true>::writeval(buffer
+ 16, note_type
);
1282 memcpy(buffer
+ 3 * (size
/ 8), name
, namesz
);
1284 const char* note_name
= this->namepool_
.add(".note", false, NULL
);
1285 elfcpp::Elf_Xword flags
= 0;
1287 flags
= elfcpp::SHF_ALLOC
;
1288 Output_section
* os
= this->make_output_section(note_name
,
1291 Output_section_data
* posd
= new Output_data_const_buffer(buffer
, notehdrsz
,
1293 os
->add_output_section_data(posd
);
1295 *trailing_padding
= aligned_descsz
- descsz
;
1300 // For an executable or shared library, create a note to record the
1301 // version of gold used to create the binary.
1304 Layout::create_gold_note()
1306 if (parameters
->options().relocatable())
1309 std::string desc
= std::string("gold ") + gold::get_version_string();
1311 size_t trailing_padding
;
1312 Output_section
*os
= this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION
,
1313 desc
.size(), false, &trailing_padding
);
1315 Output_section_data
* posd
= new Output_data_const(desc
, 4);
1316 os
->add_output_section_data(posd
);
1318 if (trailing_padding
> 0)
1320 posd
= new Output_data_fixed_space(trailing_padding
, 0);
1321 os
->add_output_section_data(posd
);
1325 // Record whether the stack should be executable. This can be set
1326 // from the command line using the -z execstack or -z noexecstack
1327 // options. Otherwise, if any input file has a .note.GNU-stack
1328 // section with the SHF_EXECINSTR flag set, the stack should be
1329 // executable. Otherwise, if at least one input file a
1330 // .note.GNU-stack section, and some input file has no .note.GNU-stack
1331 // section, we use the target default for whether the stack should be
1332 // executable. Otherwise, we don't generate a stack note. When
1333 // generating a object file, we create a .note.GNU-stack section with
1334 // the appropriate marking. When generating an executable or shared
1335 // library, we create a PT_GNU_STACK segment.
1338 Layout::create_executable_stack_info(const Target
* target
)
1340 bool is_stack_executable
;
1341 if (this->options_
.is_execstack_set())
1342 is_stack_executable
= this->options_
.is_stack_executable();
1343 else if (!this->input_with_gnu_stack_note_
)
1347 if (this->input_requires_executable_stack_
)
1348 is_stack_executable
= true;
1349 else if (this->input_without_gnu_stack_note_
)
1350 is_stack_executable
= target
->is_default_stack_executable();
1352 is_stack_executable
= false;
1355 if (parameters
->options().relocatable())
1357 const char* name
= this->namepool_
.add(".note.GNU-stack", false, NULL
);
1358 elfcpp::Elf_Xword flags
= 0;
1359 if (is_stack_executable
)
1360 flags
|= elfcpp::SHF_EXECINSTR
;
1361 this->make_output_section(name
, elfcpp::SHT_PROGBITS
, flags
);
1365 if (this->script_options_
->saw_phdrs_clause())
1367 int flags
= elfcpp::PF_R
| elfcpp::PF_W
;
1368 if (is_stack_executable
)
1369 flags
|= elfcpp::PF_X
;
1370 this->make_output_segment(elfcpp::PT_GNU_STACK
, flags
);
1374 // If --build-id was used, set up the build ID note.
1377 Layout::create_build_id()
1379 if (!parameters
->options().user_set_build_id())
1382 const char* style
= parameters
->options().build_id();
1383 if (strcmp(style
, "none") == 0)
1386 // Set DESCSZ to the size of the note descriptor. When possible,
1387 // set DESC to the note descriptor contents.
1390 if (strcmp(style
, "md5") == 0)
1392 else if (strcmp(style
, "sha1") == 0)
1394 else if (strcmp(style
, "uuid") == 0)
1396 const size_t uuidsz
= 128 / 8;
1398 char buffer
[uuidsz
];
1399 memset(buffer
, 0, uuidsz
);
1401 int descriptor
= ::open("/dev/urandom", O_RDONLY
);
1403 gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"),
1407 ssize_t got
= ::read(descriptor
, buffer
, uuidsz
);
1408 ::close(descriptor
);
1410 gold_error(_("/dev/urandom: read failed: %s"), strerror(errno
));
1411 else if (static_cast<size_t>(got
) != uuidsz
)
1412 gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"),
1416 desc
.assign(buffer
, uuidsz
);
1419 else if (strncmp(style
, "0x", 2) == 0)
1422 const char* p
= style
+ 2;
1425 if (hex_p(p
[0]) && hex_p(p
[1]))
1427 char c
= (hex_value(p
[0]) << 4) | hex_value(p
[1]);
1431 else if (*p
== '-' || *p
== ':')
1434 gold_fatal(_("--build-id argument '%s' not a valid hex number"),
1437 descsz
= desc
.size();
1440 gold_fatal(_("unrecognized --build-id argument '%s'"), style
);
1443 size_t trailing_padding
;
1444 Output_section
* os
= this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID
,
1445 descsz
, true, &trailing_padding
);
1449 // We know the value already, so we fill it in now.
1450 gold_assert(desc
.size() == descsz
);
1452 Output_section_data
* posd
= new Output_data_const(desc
, 4);
1453 os
->add_output_section_data(posd
);
1455 if (trailing_padding
!= 0)
1457 posd
= new Output_data_fixed_space(trailing_padding
, 0);
1458 os
->add_output_section_data(posd
);
1463 // We need to compute a checksum after we have completed the
1465 gold_assert(trailing_padding
== 0);
1466 this->build_id_note_
= new Output_data_fixed_space(descsz
, 4);
1467 os
->add_output_section_data(this->build_id_note_
);
1468 os
->set_after_input_sections();
1472 // Return whether SEG1 should be before SEG2 in the output file. This
1473 // is based entirely on the segment type and flags. When this is
1474 // called the segment addresses has normally not yet been set.
1477 Layout::segment_precedes(const Output_segment
* seg1
,
1478 const Output_segment
* seg2
)
1480 elfcpp::Elf_Word type1
= seg1
->type();
1481 elfcpp::Elf_Word type2
= seg2
->type();
1483 // The single PT_PHDR segment is required to precede any loadable
1484 // segment. We simply make it always first.
1485 if (type1
== elfcpp::PT_PHDR
)
1487 gold_assert(type2
!= elfcpp::PT_PHDR
);
1490 if (type2
== elfcpp::PT_PHDR
)
1493 // The single PT_INTERP segment is required to precede any loadable
1494 // segment. We simply make it always second.
1495 if (type1
== elfcpp::PT_INTERP
)
1497 gold_assert(type2
!= elfcpp::PT_INTERP
);
1500 if (type2
== elfcpp::PT_INTERP
)
1503 // We then put PT_LOAD segments before any other segments.
1504 if (type1
== elfcpp::PT_LOAD
&& type2
!= elfcpp::PT_LOAD
)
1506 if (type2
== elfcpp::PT_LOAD
&& type1
!= elfcpp::PT_LOAD
)
1509 // We put the PT_TLS segment last, because that is where the dynamic
1510 // linker expects to find it (this is just for efficiency; other
1511 // positions would also work correctly).
1512 if (type1
== elfcpp::PT_TLS
&& type2
!= elfcpp::PT_TLS
)
1514 if (type2
== elfcpp::PT_TLS
&& type1
!= elfcpp::PT_TLS
)
1517 const elfcpp::Elf_Word flags1
= seg1
->flags();
1518 const elfcpp::Elf_Word flags2
= seg2
->flags();
1520 // The order of non-PT_LOAD segments is unimportant. We simply sort
1521 // by the numeric segment type and flags values. There should not
1522 // be more than one segment with the same type and flags.
1523 if (type1
!= elfcpp::PT_LOAD
)
1526 return type1
< type2
;
1527 gold_assert(flags1
!= flags2
);
1528 return flags1
< flags2
;
1531 // If the addresses are set already, sort by load address.
1532 if (seg1
->are_addresses_set())
1534 if (!seg2
->are_addresses_set())
1537 unsigned int section_count1
= seg1
->output_section_count();
1538 unsigned int section_count2
= seg2
->output_section_count();
1539 if (section_count1
== 0 && section_count2
> 0)
1541 if (section_count1
> 0 && section_count2
== 0)
1544 uint64_t paddr1
= seg1
->first_section_load_address();
1545 uint64_t paddr2
= seg2
->first_section_load_address();
1546 if (paddr1
!= paddr2
)
1547 return paddr1
< paddr2
;
1549 else if (seg2
->are_addresses_set())
1552 // We sort PT_LOAD segments based on the flags. Readonly segments
1553 // come before writable segments. Then writable segments with data
1554 // come before writable segments without data. Then executable
1555 // segments come before non-executable segments. Then the unlikely
1556 // case of a non-readable segment comes before the normal case of a
1557 // readable segment. If there are multiple segments with the same
1558 // type and flags, we require that the address be set, and we sort
1559 // by virtual address and then physical address.
1560 if ((flags1
& elfcpp::PF_W
) != (flags2
& elfcpp::PF_W
))
1561 return (flags1
& elfcpp::PF_W
) == 0;
1562 if ((flags1
& elfcpp::PF_W
) != 0
1563 && seg1
->has_any_data_sections() != seg2
->has_any_data_sections())
1564 return seg1
->has_any_data_sections();
1565 if ((flags1
& elfcpp::PF_X
) != (flags2
& elfcpp::PF_X
))
1566 return (flags1
& elfcpp::PF_X
) != 0;
1567 if ((flags1
& elfcpp::PF_R
) != (flags2
& elfcpp::PF_R
))
1568 return (flags1
& elfcpp::PF_R
) == 0;
1570 // We shouldn't get here--we shouldn't create segments which we
1571 // can't distinguish.
1575 // Set the file offsets of all the segments, and all the sections they
1576 // contain. They have all been created. LOAD_SEG must be be laid out
1577 // first. Return the offset of the data to follow.
1580 Layout::set_segment_offsets(const Target
* target
, Output_segment
* load_seg
,
1581 unsigned int *pshndx
)
1583 // Sort them into the final order.
1584 std::sort(this->segment_list_
.begin(), this->segment_list_
.end(),
1585 Layout::Compare_segments());
1587 // Find the PT_LOAD segments, and set their addresses and offsets
1588 // and their section's addresses and offsets.
1590 if (this->options_
.user_set_Ttext())
1591 addr
= this->options_
.Ttext();
1592 else if (parameters
->options().shared())
1595 addr
= target
->default_text_segment_address();
1598 // If LOAD_SEG is NULL, then the file header and segment headers
1599 // will not be loadable. But they still need to be at offset 0 in
1600 // the file. Set their offsets now.
1601 if (load_seg
== NULL
)
1603 for (Data_list::iterator p
= this->special_output_list_
.begin();
1604 p
!= this->special_output_list_
.end();
1607 off
= align_address(off
, (*p
)->addralign());
1608 (*p
)->set_address_and_file_offset(0, off
);
1609 off
+= (*p
)->data_size();
1613 bool was_readonly
= false;
1614 for (Segment_list::iterator p
= this->segment_list_
.begin();
1615 p
!= this->segment_list_
.end();
1618 if ((*p
)->type() == elfcpp::PT_LOAD
)
1620 if (load_seg
!= NULL
&& load_seg
!= *p
)
1624 bool are_addresses_set
= (*p
)->are_addresses_set();
1625 if (are_addresses_set
)
1627 // When it comes to setting file offsets, we care about
1628 // the physical address.
1629 addr
= (*p
)->paddr();
1631 else if (this->options_
.user_set_Tdata()
1632 && ((*p
)->flags() & elfcpp::PF_W
) != 0
1633 && (!this->options_
.user_set_Tbss()
1634 || (*p
)->has_any_data_sections()))
1636 addr
= this->options_
.Tdata();
1637 are_addresses_set
= true;
1639 else if (this->options_
.user_set_Tbss()
1640 && ((*p
)->flags() & elfcpp::PF_W
) != 0
1641 && !(*p
)->has_any_data_sections())
1643 addr
= this->options_
.Tbss();
1644 are_addresses_set
= true;
1647 uint64_t orig_addr
= addr
;
1648 uint64_t orig_off
= off
;
1650 uint64_t aligned_addr
= 0;
1651 uint64_t abi_pagesize
= target
->abi_pagesize();
1653 // FIXME: This should depend on the -n and -N options.
1654 (*p
)->set_minimum_p_align(target
->common_pagesize());
1656 if (are_addresses_set
)
1658 // Adjust the file offset to the same address modulo the
1660 uint64_t unsigned_off
= off
;
1661 uint64_t aligned_off
= ((unsigned_off
& ~(abi_pagesize
- 1))
1662 | (addr
& (abi_pagesize
- 1)));
1663 if (aligned_off
< unsigned_off
)
1664 aligned_off
+= abi_pagesize
;
1669 // If the last segment was readonly, and this one is
1670 // not, then skip the address forward one page,
1671 // maintaining the same position within the page. This
1672 // lets us store both segments overlapping on a single
1673 // page in the file, but the loader will put them on
1674 // different pages in memory.
1676 addr
= align_address(addr
, (*p
)->maximum_alignment());
1677 aligned_addr
= addr
;
1679 if (was_readonly
&& ((*p
)->flags() & elfcpp::PF_W
) != 0)
1681 if ((addr
& (abi_pagesize
- 1)) != 0)
1682 addr
= addr
+ abi_pagesize
;
1685 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
1688 unsigned int shndx_hold
= *pshndx
;
1689 uint64_t new_addr
= (*p
)->set_section_addresses(this, false, addr
,
1692 // Now that we know the size of this segment, we may be able
1693 // to save a page in memory, at the cost of wasting some
1694 // file space, by instead aligning to the start of a new
1695 // page. Here we use the real machine page size rather than
1696 // the ABI mandated page size.
1698 if (!are_addresses_set
&& aligned_addr
!= addr
)
1700 uint64_t common_pagesize
= target
->common_pagesize();
1701 uint64_t first_off
= (common_pagesize
1703 & (common_pagesize
- 1)));
1704 uint64_t last_off
= new_addr
& (common_pagesize
- 1);
1707 && ((aligned_addr
& ~ (common_pagesize
- 1))
1708 != (new_addr
& ~ (common_pagesize
- 1)))
1709 && first_off
+ last_off
<= common_pagesize
)
1711 *pshndx
= shndx_hold
;
1712 addr
= align_address(aligned_addr
, common_pagesize
);
1713 addr
= align_address(addr
, (*p
)->maximum_alignment());
1714 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
1715 new_addr
= (*p
)->set_section_addresses(this, true, addr
,
1722 if (((*p
)->flags() & elfcpp::PF_W
) == 0)
1723 was_readonly
= true;
1727 // Handle the non-PT_LOAD segments, setting their offsets from their
1728 // section's offsets.
1729 for (Segment_list::iterator p
= this->segment_list_
.begin();
1730 p
!= this->segment_list_
.end();
1733 if ((*p
)->type() != elfcpp::PT_LOAD
)
1737 // Set the TLS offsets for each section in the PT_TLS segment.
1738 if (this->tls_segment_
!= NULL
)
1739 this->tls_segment_
->set_tls_offsets();
1744 // Set the offsets of all the allocated sections when doing a
1745 // relocatable link. This does the same jobs as set_segment_offsets,
1746 // only for a relocatable link.
1749 Layout::set_relocatable_section_offsets(Output_data
* file_header
,
1750 unsigned int *pshndx
)
1754 file_header
->set_address_and_file_offset(0, 0);
1755 off
+= file_header
->data_size();
1757 for (Section_list::iterator p
= this->section_list_
.begin();
1758 p
!= this->section_list_
.end();
1761 // We skip unallocated sections here, except that group sections
1762 // have to come first.
1763 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) == 0
1764 && (*p
)->type() != elfcpp::SHT_GROUP
)
1767 off
= align_address(off
, (*p
)->addralign());
1769 // The linker script might have set the address.
1770 if (!(*p
)->is_address_valid())
1771 (*p
)->set_address(0);
1772 (*p
)->set_file_offset(off
);
1773 (*p
)->finalize_data_size();
1774 off
+= (*p
)->data_size();
1776 (*p
)->set_out_shndx(*pshndx
);
1783 // Set the file offset of all the sections not associated with a
1787 Layout::set_section_offsets(off_t off
, Layout::Section_offset_pass pass
)
1789 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
1790 p
!= this->unattached_section_list_
.end();
1793 // The symtab section is handled in create_symtab_sections.
1794 if (*p
== this->symtab_section_
)
1797 // If we've already set the data size, don't set it again.
1798 if ((*p
)->is_offset_valid() && (*p
)->is_data_size_valid())
1801 if (pass
== BEFORE_INPUT_SECTIONS_PASS
1802 && (*p
)->requires_postprocessing())
1804 (*p
)->create_postprocessing_buffer();
1805 this->any_postprocessing_sections_
= true;
1808 if (pass
== BEFORE_INPUT_SECTIONS_PASS
1809 && (*p
)->after_input_sections())
1811 else if (pass
== POSTPROCESSING_SECTIONS_PASS
1812 && (!(*p
)->after_input_sections()
1813 || (*p
)->type() == elfcpp::SHT_STRTAB
))
1815 else if (pass
== STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
1816 && (!(*p
)->after_input_sections()
1817 || (*p
)->type() != elfcpp::SHT_STRTAB
))
1820 off
= align_address(off
, (*p
)->addralign());
1821 (*p
)->set_file_offset(off
);
1822 (*p
)->finalize_data_size();
1823 off
+= (*p
)->data_size();
1825 // At this point the name must be set.
1826 if (pass
!= STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
)
1827 this->namepool_
.add((*p
)->name(), false, NULL
);
1832 // Set the section indexes of all the sections not associated with a
1836 Layout::set_section_indexes(unsigned int shndx
)
1838 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
1839 p
!= this->unattached_section_list_
.end();
1842 if (!(*p
)->has_out_shndx())
1844 (*p
)->set_out_shndx(shndx
);
1851 // Set the section addresses according to the linker script. This is
1852 // only called when we see a SECTIONS clause. This returns the
1853 // program segment which should hold the file header and segment
1854 // headers, if any. It will return NULL if they should not be in a
1858 Layout::set_section_addresses_from_script(Symbol_table
* symtab
)
1860 Script_sections
* ss
= this->script_options_
->script_sections();
1861 gold_assert(ss
->saw_sections_clause());
1863 // Place each orphaned output section in the script.
1864 for (Section_list::iterator p
= this->section_list_
.begin();
1865 p
!= this->section_list_
.end();
1868 if (!(*p
)->found_in_sections_clause())
1869 ss
->place_orphan(*p
);
1872 return this->script_options_
->set_section_addresses(symtab
, this);
1875 // Count the local symbols in the regular symbol table and the dynamic
1876 // symbol table, and build the respective string pools.
1879 Layout::count_local_symbols(const Task
* task
,
1880 const Input_objects
* input_objects
)
1882 // First, figure out an upper bound on the number of symbols we'll
1883 // be inserting into each pool. This helps us create the pools with
1884 // the right size, to avoid unnecessary hashtable resizing.
1885 unsigned int symbol_count
= 0;
1886 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1887 p
!= input_objects
->relobj_end();
1889 symbol_count
+= (*p
)->local_symbol_count();
1891 // Go from "upper bound" to "estimate." We overcount for two
1892 // reasons: we double-count symbols that occur in more than one
1893 // object file, and we count symbols that are dropped from the
1894 // output. Add it all together and assume we overcount by 100%.
1897 // We assume all symbols will go into both the sympool and dynpool.
1898 this->sympool_
.reserve(symbol_count
);
1899 this->dynpool_
.reserve(symbol_count
);
1901 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1902 p
!= input_objects
->relobj_end();
1905 Task_lock_obj
<Object
> tlo(task
, *p
);
1906 (*p
)->count_local_symbols(&this->sympool_
, &this->dynpool_
);
1910 // Create the symbol table sections. Here we also set the final
1911 // values of the symbols. At this point all the loadable sections are
1912 // fully laid out. SHNUM is the number of sections so far.
1915 Layout::create_symtab_sections(const Input_objects
* input_objects
,
1916 Symbol_table
* symtab
,
1922 if (parameters
->target().get_size() == 32)
1924 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
1927 else if (parameters
->target().get_size() == 64)
1929 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
1936 off
= align_address(off
, align
);
1937 off_t startoff
= off
;
1939 // Save space for the dummy symbol at the start of the section. We
1940 // never bother to write this out--it will just be left as zero.
1942 unsigned int local_symbol_index
= 1;
1944 // Add STT_SECTION symbols for each Output section which needs one.
1945 for (Section_list::iterator p
= this->section_list_
.begin();
1946 p
!= this->section_list_
.end();
1949 if (!(*p
)->needs_symtab_index())
1950 (*p
)->set_symtab_index(-1U);
1953 (*p
)->set_symtab_index(local_symbol_index
);
1954 ++local_symbol_index
;
1959 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
1960 p
!= input_objects
->relobj_end();
1963 unsigned int index
= (*p
)->finalize_local_symbols(local_symbol_index
,
1965 off
+= (index
- local_symbol_index
) * symsize
;
1966 local_symbol_index
= index
;
1969 unsigned int local_symcount
= local_symbol_index
;
1970 gold_assert(local_symcount
* symsize
== off
- startoff
);
1973 size_t dyn_global_index
;
1975 if (this->dynsym_section_
== NULL
)
1978 dyn_global_index
= 0;
1983 dyn_global_index
= this->dynsym_section_
->info();
1984 off_t locsize
= dyn_global_index
* this->dynsym_section_
->entsize();
1985 dynoff
= this->dynsym_section_
->offset() + locsize
;
1986 dyncount
= (this->dynsym_section_
->data_size() - locsize
) / symsize
;
1987 gold_assert(static_cast<off_t
>(dyncount
* symsize
)
1988 == this->dynsym_section_
->data_size() - locsize
);
1991 off
= symtab
->finalize(off
, dynoff
, dyn_global_index
, dyncount
,
1992 &this->sympool_
, &local_symcount
);
1994 if (!parameters
->options().strip_all())
1996 this->sympool_
.set_string_offsets();
1998 const char* symtab_name
= this->namepool_
.add(".symtab", false, NULL
);
1999 Output_section
* osymtab
= this->make_output_section(symtab_name
,
2002 this->symtab_section_
= osymtab
;
2004 Output_section_data
* pos
= new Output_data_fixed_space(off
- startoff
,
2006 osymtab
->add_output_section_data(pos
);
2008 // We generate a .symtab_shndx section if we have more than
2009 // SHN_LORESERVE sections. Technically it is possible that we
2010 // don't need one, because it is possible that there are no
2011 // symbols in any of sections with indexes larger than
2012 // SHN_LORESERVE. That is probably unusual, though, and it is
2013 // easier to always create one than to compute section indexes
2014 // twice (once here, once when writing out the symbols).
2015 if (shnum
>= elfcpp::SHN_LORESERVE
)
2017 const char* symtab_xindex_name
= this->namepool_
.add(".symtab_shndx",
2019 Output_section
* osymtab_xindex
=
2020 this->make_output_section(symtab_xindex_name
,
2021 elfcpp::SHT_SYMTAB_SHNDX
, 0);
2023 size_t symcount
= (off
- startoff
) / symsize
;
2024 this->symtab_xindex_
= new Output_symtab_xindex(symcount
);
2026 osymtab_xindex
->add_output_section_data(this->symtab_xindex_
);
2028 osymtab_xindex
->set_link_section(osymtab
);
2029 osymtab_xindex
->set_addralign(4);
2030 osymtab_xindex
->set_entsize(4);
2032 osymtab_xindex
->set_after_input_sections();
2034 // This tells the driver code to wait until the symbol table
2035 // has written out before writing out the postprocessing
2036 // sections, including the .symtab_shndx section.
2037 this->any_postprocessing_sections_
= true;
2040 const char* strtab_name
= this->namepool_
.add(".strtab", false, NULL
);
2041 Output_section
* ostrtab
= this->make_output_section(strtab_name
,
2045 Output_section_data
* pstr
= new Output_data_strtab(&this->sympool_
);
2046 ostrtab
->add_output_section_data(pstr
);
2048 osymtab
->set_file_offset(startoff
);
2049 osymtab
->finalize_data_size();
2050 osymtab
->set_link_section(ostrtab
);
2051 osymtab
->set_info(local_symcount
);
2052 osymtab
->set_entsize(symsize
);
2058 // Create the .shstrtab section, which holds the names of the
2059 // sections. At the time this is called, we have created all the
2060 // output sections except .shstrtab itself.
2063 Layout::create_shstrtab()
2065 // FIXME: We don't need to create a .shstrtab section if we are
2066 // stripping everything.
2068 const char* name
= this->namepool_
.add(".shstrtab", false, NULL
);
2070 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_STRTAB
, 0);
2072 // We can't write out this section until we've set all the section
2073 // names, and we don't set the names of compressed output sections
2074 // until relocations are complete.
2075 os
->set_after_input_sections();
2077 Output_section_data
* posd
= new Output_data_strtab(&this->namepool_
);
2078 os
->add_output_section_data(posd
);
2083 // Create the section headers. SIZE is 32 or 64. OFF is the file
2087 Layout::create_shdrs(const Output_section
* shstrtab_section
, off_t
* poff
)
2089 Output_section_headers
* oshdrs
;
2090 oshdrs
= new Output_section_headers(this,
2091 &this->segment_list_
,
2092 &this->section_list_
,
2093 &this->unattached_section_list_
,
2096 off_t off
= align_address(*poff
, oshdrs
->addralign());
2097 oshdrs
->set_address_and_file_offset(0, off
);
2098 off
+= oshdrs
->data_size();
2100 this->section_headers_
= oshdrs
;
2103 // Count the allocated sections.
2106 Layout::allocated_output_section_count() const
2108 size_t section_count
= 0;
2109 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
2110 p
!= this->segment_list_
.end();
2112 section_count
+= (*p
)->output_section_count();
2113 return section_count
;
2116 // Create the dynamic symbol table.
2119 Layout::create_dynamic_symtab(const Input_objects
* input_objects
,
2120 Symbol_table
* symtab
,
2121 Output_section
**pdynstr
,
2122 unsigned int* plocal_dynamic_count
,
2123 std::vector
<Symbol
*>* pdynamic_symbols
,
2124 Versions
* pversions
)
2126 // Count all the symbols in the dynamic symbol table, and set the
2127 // dynamic symbol indexes.
2129 // Skip symbol 0, which is always all zeroes.
2130 unsigned int index
= 1;
2132 // Add STT_SECTION symbols for each Output section which needs one.
2133 for (Section_list::iterator p
= this->section_list_
.begin();
2134 p
!= this->section_list_
.end();
2137 if (!(*p
)->needs_dynsym_index())
2138 (*p
)->set_dynsym_index(-1U);
2141 (*p
)->set_dynsym_index(index
);
2146 // Count the local symbols that need to go in the dynamic symbol table,
2147 // and set the dynamic symbol indexes.
2148 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2149 p
!= input_objects
->relobj_end();
2152 unsigned int new_index
= (*p
)->set_local_dynsym_indexes(index
);
2156 unsigned int local_symcount
= index
;
2157 *plocal_dynamic_count
= local_symcount
;
2159 index
= symtab
->set_dynsym_indexes(index
, pdynamic_symbols
,
2160 &this->dynpool_
, pversions
);
2164 const int size
= parameters
->target().get_size();
2167 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
2170 else if (size
== 64)
2172 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
2178 // Create the dynamic symbol table section.
2180 Output_section
* dynsym
= this->choose_output_section(NULL
, ".dynsym",
2185 Output_section_data
* odata
= new Output_data_fixed_space(index
* symsize
,
2187 dynsym
->add_output_section_data(odata
);
2189 dynsym
->set_info(local_symcount
);
2190 dynsym
->set_entsize(symsize
);
2191 dynsym
->set_addralign(align
);
2193 this->dynsym_section_
= dynsym
;
2195 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
2196 odyn
->add_section_address(elfcpp::DT_SYMTAB
, dynsym
);
2197 odyn
->add_constant(elfcpp::DT_SYMENT
, symsize
);
2199 // If there are more than SHN_LORESERVE allocated sections, we
2200 // create a .dynsym_shndx section. It is possible that we don't
2201 // need one, because it is possible that there are no dynamic
2202 // symbols in any of the sections with indexes larger than
2203 // SHN_LORESERVE. This is probably unusual, though, and at this
2204 // time we don't know the actual section indexes so it is
2205 // inconvenient to check.
2206 if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE
)
2208 Output_section
* dynsym_xindex
=
2209 this->choose_output_section(NULL
, ".dynsym_shndx",
2210 elfcpp::SHT_SYMTAB_SHNDX
,
2214 this->dynsym_xindex_
= new Output_symtab_xindex(index
);
2216 dynsym_xindex
->add_output_section_data(this->dynsym_xindex_
);
2218 dynsym_xindex
->set_link_section(dynsym
);
2219 dynsym_xindex
->set_addralign(4);
2220 dynsym_xindex
->set_entsize(4);
2222 dynsym_xindex
->set_after_input_sections();
2224 // This tells the driver code to wait until the symbol table has
2225 // written out before writing out the postprocessing sections,
2226 // including the .dynsym_shndx section.
2227 this->any_postprocessing_sections_
= true;
2230 // Create the dynamic string table section.
2232 Output_section
* dynstr
= this->choose_output_section(NULL
, ".dynstr",
2237 Output_section_data
* strdata
= new Output_data_strtab(&this->dynpool_
);
2238 dynstr
->add_output_section_data(strdata
);
2240 dynsym
->set_link_section(dynstr
);
2241 this->dynamic_section_
->set_link_section(dynstr
);
2243 odyn
->add_section_address(elfcpp::DT_STRTAB
, dynstr
);
2244 odyn
->add_section_size(elfcpp::DT_STRSZ
, dynstr
);
2248 // Create the hash tables.
2250 if (strcmp(parameters
->options().hash_style(), "sysv") == 0
2251 || strcmp(parameters
->options().hash_style(), "both") == 0)
2253 unsigned char* phash
;
2254 unsigned int hashlen
;
2255 Dynobj::create_elf_hash_table(*pdynamic_symbols
, local_symcount
,
2258 Output_section
* hashsec
= this->choose_output_section(NULL
, ".hash",
2263 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
2266 hashsec
->add_output_section_data(hashdata
);
2268 hashsec
->set_link_section(dynsym
);
2269 hashsec
->set_entsize(4);
2271 odyn
->add_section_address(elfcpp::DT_HASH
, hashsec
);
2274 if (strcmp(parameters
->options().hash_style(), "gnu") == 0
2275 || strcmp(parameters
->options().hash_style(), "both") == 0)
2277 unsigned char* phash
;
2278 unsigned int hashlen
;
2279 Dynobj::create_gnu_hash_table(*pdynamic_symbols
, local_symcount
,
2282 Output_section
* hashsec
= this->choose_output_section(NULL
, ".gnu.hash",
2283 elfcpp::SHT_GNU_HASH
,
2287 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
2290 hashsec
->add_output_section_data(hashdata
);
2292 hashsec
->set_link_section(dynsym
);
2293 hashsec
->set_entsize(4);
2295 odyn
->add_section_address(elfcpp::DT_GNU_HASH
, hashsec
);
2299 // Assign offsets to each local portion of the dynamic symbol table.
2302 Layout::assign_local_dynsym_offsets(const Input_objects
* input_objects
)
2304 Output_section
* dynsym
= this->dynsym_section_
;
2305 gold_assert(dynsym
!= NULL
);
2307 off_t off
= dynsym
->offset();
2309 // Skip the dummy symbol at the start of the section.
2310 off
+= dynsym
->entsize();
2312 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2313 p
!= input_objects
->relobj_end();
2316 unsigned int count
= (*p
)->set_local_dynsym_offset(off
);
2317 off
+= count
* dynsym
->entsize();
2321 // Create the version sections.
2324 Layout::create_version_sections(const Versions
* versions
,
2325 const Symbol_table
* symtab
,
2326 unsigned int local_symcount
,
2327 const std::vector
<Symbol
*>& dynamic_symbols
,
2328 const Output_section
* dynstr
)
2330 if (!versions
->any_defs() && !versions
->any_needs())
2333 switch (parameters
->size_and_endianness())
2335 #ifdef HAVE_TARGET_32_LITTLE
2336 case Parameters::TARGET_32_LITTLE
:
2337 this->sized_create_version_sections
<32, false>(versions
, symtab
,
2339 dynamic_symbols
, dynstr
);
2342 #ifdef HAVE_TARGET_32_BIG
2343 case Parameters::TARGET_32_BIG
:
2344 this->sized_create_version_sections
<32, true>(versions
, symtab
,
2346 dynamic_symbols
, dynstr
);
2349 #ifdef HAVE_TARGET_64_LITTLE
2350 case Parameters::TARGET_64_LITTLE
:
2351 this->sized_create_version_sections
<64, false>(versions
, symtab
,
2353 dynamic_symbols
, dynstr
);
2356 #ifdef HAVE_TARGET_64_BIG
2357 case Parameters::TARGET_64_BIG
:
2358 this->sized_create_version_sections
<64, true>(versions
, symtab
,
2360 dynamic_symbols
, dynstr
);
2368 // Create the version sections, sized version.
2370 template<int size
, bool big_endian
>
2372 Layout::sized_create_version_sections(
2373 const Versions
* versions
,
2374 const Symbol_table
* symtab
,
2375 unsigned int local_symcount
,
2376 const std::vector
<Symbol
*>& dynamic_symbols
,
2377 const Output_section
* dynstr
)
2379 Output_section
* vsec
= this->choose_output_section(NULL
, ".gnu.version",
2380 elfcpp::SHT_GNU_versym
,
2384 unsigned char* vbuf
;
2386 versions
->symbol_section_contents
<size
, big_endian
>(symtab
, &this->dynpool_
,
2391 Output_section_data
* vdata
= new Output_data_const_buffer(vbuf
, vsize
, 2);
2393 vsec
->add_output_section_data(vdata
);
2394 vsec
->set_entsize(2);
2395 vsec
->set_link_section(this->dynsym_section_
);
2397 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
2398 odyn
->add_section_address(elfcpp::DT_VERSYM
, vsec
);
2400 if (versions
->any_defs())
2402 Output_section
* vdsec
;
2403 vdsec
= this->choose_output_section(NULL
, ".gnu.version_d",
2404 elfcpp::SHT_GNU_verdef
,
2408 unsigned char* vdbuf
;
2409 unsigned int vdsize
;
2410 unsigned int vdentries
;
2411 versions
->def_section_contents
<size
, big_endian
>(&this->dynpool_
, &vdbuf
,
2412 &vdsize
, &vdentries
);
2414 Output_section_data
* vddata
= new Output_data_const_buffer(vdbuf
,
2418 vdsec
->add_output_section_data(vddata
);
2419 vdsec
->set_link_section(dynstr
);
2420 vdsec
->set_info(vdentries
);
2422 odyn
->add_section_address(elfcpp::DT_VERDEF
, vdsec
);
2423 odyn
->add_constant(elfcpp::DT_VERDEFNUM
, vdentries
);
2426 if (versions
->any_needs())
2428 Output_section
* vnsec
;
2429 vnsec
= this->choose_output_section(NULL
, ".gnu.version_r",
2430 elfcpp::SHT_GNU_verneed
,
2434 unsigned char* vnbuf
;
2435 unsigned int vnsize
;
2436 unsigned int vnentries
;
2437 versions
->need_section_contents
<size
, big_endian
>(&this->dynpool_
,
2441 Output_section_data
* vndata
= new Output_data_const_buffer(vnbuf
,
2445 vnsec
->add_output_section_data(vndata
);
2446 vnsec
->set_link_section(dynstr
);
2447 vnsec
->set_info(vnentries
);
2449 odyn
->add_section_address(elfcpp::DT_VERNEED
, vnsec
);
2450 odyn
->add_constant(elfcpp::DT_VERNEEDNUM
, vnentries
);
2454 // Create the .interp section and PT_INTERP segment.
2457 Layout::create_interp(const Target
* target
)
2459 const char* interp
= this->options_
.dynamic_linker();
2462 interp
= target
->dynamic_linker();
2463 gold_assert(interp
!= NULL
);
2466 size_t len
= strlen(interp
) + 1;
2468 Output_section_data
* odata
= new Output_data_const(interp
, len
, 1);
2470 Output_section
* osec
= this->choose_output_section(NULL
, ".interp",
2471 elfcpp::SHT_PROGBITS
,
2474 osec
->add_output_section_data(odata
);
2476 if (!this->script_options_
->saw_phdrs_clause())
2478 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_INTERP
,
2480 oseg
->add_initial_output_section(osec
, elfcpp::PF_R
);
2484 // Finish the .dynamic section and PT_DYNAMIC segment.
2487 Layout::finish_dynamic_section(const Input_objects
* input_objects
,
2488 const Symbol_table
* symtab
)
2490 if (!this->script_options_
->saw_phdrs_clause())
2492 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_DYNAMIC
,
2495 oseg
->add_initial_output_section(this->dynamic_section_
,
2496 elfcpp::PF_R
| elfcpp::PF_W
);
2499 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
2501 for (Input_objects::Dynobj_iterator p
= input_objects
->dynobj_begin();
2502 p
!= input_objects
->dynobj_end();
2505 // FIXME: Handle --as-needed.
2506 odyn
->add_string(elfcpp::DT_NEEDED
, (*p
)->soname());
2509 if (parameters
->options().shared())
2511 const char* soname
= this->options_
.soname();
2513 odyn
->add_string(elfcpp::DT_SONAME
, soname
);
2516 // FIXME: Support --init and --fini.
2517 Symbol
* sym
= symtab
->lookup("_init");
2518 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
2519 odyn
->add_symbol(elfcpp::DT_INIT
, sym
);
2521 sym
= symtab
->lookup("_fini");
2522 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
2523 odyn
->add_symbol(elfcpp::DT_FINI
, sym
);
2525 // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY.
2527 // Add a DT_RPATH entry if needed.
2528 const General_options::Dir_list
& rpath(this->options_
.rpath());
2531 std::string rpath_val
;
2532 for (General_options::Dir_list::const_iterator p
= rpath
.begin();
2536 if (rpath_val
.empty())
2537 rpath_val
= p
->name();
2540 // Eliminate duplicates.
2541 General_options::Dir_list::const_iterator q
;
2542 for (q
= rpath
.begin(); q
!= p
; ++q
)
2543 if (q
->name() == p
->name())
2548 rpath_val
+= p
->name();
2553 odyn
->add_string(elfcpp::DT_RPATH
, rpath_val
);
2554 if (parameters
->options().enable_new_dtags())
2555 odyn
->add_string(elfcpp::DT_RUNPATH
, rpath_val
);
2558 // Look for text segments that have dynamic relocations.
2559 bool have_textrel
= false;
2560 if (!this->script_options_
->saw_sections_clause())
2562 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
2563 p
!= this->segment_list_
.end();
2566 if (((*p
)->flags() & elfcpp::PF_W
) == 0
2567 && (*p
)->dynamic_reloc_count() > 0)
2569 have_textrel
= true;
2576 // We don't know the section -> segment mapping, so we are
2577 // conservative and just look for readonly sections with
2578 // relocations. If those sections wind up in writable segments,
2579 // then we have created an unnecessary DT_TEXTREL entry.
2580 for (Section_list::const_iterator p
= this->section_list_
.begin();
2581 p
!= this->section_list_
.end();
2584 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0
2585 && ((*p
)->flags() & elfcpp::SHF_WRITE
) == 0
2586 && ((*p
)->dynamic_reloc_count() > 0))
2588 have_textrel
= true;
2594 // Add a DT_FLAGS entry. We add it even if no flags are set so that
2595 // post-link tools can easily modify these flags if desired.
2596 unsigned int flags
= 0;
2599 // Add a DT_TEXTREL for compatibility with older loaders.
2600 odyn
->add_constant(elfcpp::DT_TEXTREL
, 0);
2601 flags
|= elfcpp::DF_TEXTREL
;
2603 if (parameters
->options().shared() && this->has_static_tls())
2604 flags
|= elfcpp::DF_STATIC_TLS
;
2605 odyn
->add_constant(elfcpp::DT_FLAGS
, flags
);
2608 if (parameters
->options().initfirst())
2609 flags
|= elfcpp::DF_1_INITFIRST
;
2610 if (parameters
->options().interpose())
2611 flags
|= elfcpp::DF_1_INTERPOSE
;
2612 if (parameters
->options().loadfltr())
2613 flags
|= elfcpp::DF_1_LOADFLTR
;
2614 if (parameters
->options().nodefaultlib())
2615 flags
|= elfcpp::DF_1_NODEFLIB
;
2616 if (parameters
->options().nodelete())
2617 flags
|= elfcpp::DF_1_NODELETE
;
2618 if (parameters
->options().nodlopen())
2619 flags
|= elfcpp::DF_1_NOOPEN
;
2620 if (parameters
->options().nodump())
2621 flags
|= elfcpp::DF_1_NODUMP
;
2622 if (!parameters
->options().shared())
2623 flags
&= ~(elfcpp::DF_1_INITFIRST
2624 | elfcpp::DF_1_NODELETE
2625 | elfcpp::DF_1_NOOPEN
);
2627 odyn
->add_constant(elfcpp::DT_FLAGS_1
, flags
);
2630 // The mapping of .gnu.linkonce section names to real section names.
2632 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
2633 const Layout::Linkonce_mapping
Layout::linkonce_mapping
[] =
2635 MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
2636 MAPPING_INIT("t", ".text"),
2637 MAPPING_INIT("r", ".rodata"),
2638 MAPPING_INIT("d", ".data"),
2639 MAPPING_INIT("b", ".bss"),
2640 MAPPING_INIT("s", ".sdata"),
2641 MAPPING_INIT("sb", ".sbss"),
2642 MAPPING_INIT("s2", ".sdata2"),
2643 MAPPING_INIT("sb2", ".sbss2"),
2644 MAPPING_INIT("wi", ".debug_info"),
2645 MAPPING_INIT("td", ".tdata"),
2646 MAPPING_INIT("tb", ".tbss"),
2647 MAPPING_INIT("lr", ".lrodata"),
2648 MAPPING_INIT("l", ".ldata"),
2649 MAPPING_INIT("lb", ".lbss"),
2653 const int Layout::linkonce_mapping_count
=
2654 sizeof(Layout::linkonce_mapping
) / sizeof(Layout::linkonce_mapping
[0]);
2656 // Return the name of the output section to use for a .gnu.linkonce
2657 // section. This is based on the default ELF linker script of the old
2658 // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
2659 // to ".text". Set *PLEN to the length of the name. *PLEN is
2660 // initialized to the length of NAME.
2663 Layout::linkonce_output_name(const char* name
, size_t *plen
)
2665 const char* s
= name
+ sizeof(".gnu.linkonce") - 1;
2669 const Linkonce_mapping
* plm
= linkonce_mapping
;
2670 for (int i
= 0; i
< linkonce_mapping_count
; ++i
, ++plm
)
2672 if (strncmp(s
, plm
->from
, plm
->fromlen
) == 0 && s
[plm
->fromlen
] == '.')
2681 // Choose the output section name to use given an input section name.
2682 // Set *PLEN to the length of the name. *PLEN is initialized to the
2686 Layout::output_section_name(const char* name
, size_t* plen
)
2688 if (Layout::is_linkonce(name
))
2690 // .gnu.linkonce sections are laid out as though they were named
2691 // for the sections are placed into.
2692 return Layout::linkonce_output_name(name
, plen
);
2695 // gcc 4.3 generates the following sorts of section names when it
2696 // needs a section name specific to a function:
2702 // .data.rel.local.FN
2704 // .data.rel.ro.local.FN
2711 // The GNU linker maps all of those to the part before the .FN,
2712 // except that .data.rel.local.FN is mapped to .data, and
2713 // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections
2714 // beginning with .data.rel.ro.local are grouped together.
2716 // For an anonymous namespace, the string FN can contain a '.'.
2718 // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
2719 // GNU linker maps to .rodata.
2721 // The .data.rel.ro sections enable a security feature triggered by
2722 // the -z relro option. Section which need to be relocated at
2723 // program startup time but which may be readonly after startup are
2724 // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO
2725 // segment. The dynamic linker will make that segment writable,
2726 // perform relocations, and then make it read-only. FIXME: We do
2727 // not yet implement this optimization.
2729 // It is hard to handle this in a principled way.
2731 // These are the rules we follow:
2733 // If the section name has no initial '.', or no dot other than an
2734 // initial '.', we use the name unchanged (i.e., "mysection" and
2735 // ".text" are unchanged).
2737 // If the name starts with ".data.rel.ro" we use ".data.rel.ro".
2739 // Otherwise, we drop the second '.' and everything that comes after
2740 // it (i.e., ".text.XXX" becomes ".text").
2742 const char* s
= name
;
2746 const char* sdot
= strchr(s
, '.');
2750 const char* const data_rel_ro
= ".data.rel.ro";
2751 if (strncmp(name
, data_rel_ro
, strlen(data_rel_ro
)) == 0)
2753 *plen
= strlen(data_rel_ro
);
2757 *plen
= sdot
- name
;
2761 // Record the signature of a comdat section, and return whether to
2762 // include it in the link. If GROUP is true, this is a regular
2763 // section group. If GROUP is false, this is a group signature
2764 // derived from the name of a linkonce section. We want linkonce
2765 // signatures and group signatures to block each other, but we don't
2766 // want a linkonce signature to block another linkonce signature.
2769 Layout::add_comdat(Relobj
* object
, unsigned int shndx
,
2770 const std::string
& signature
, bool group
)
2772 Kept_section
kept(object
, shndx
, group
);
2773 std::pair
<Signatures::iterator
, bool> ins(
2774 this->signatures_
.insert(std::make_pair(signature
, kept
)));
2778 // This is the first time we've seen this signature.
2782 if (ins
.first
->second
.group_
)
2784 // We've already seen a real section group with this signature.
2789 // This is a real section group, and we've already seen a
2790 // linkonce section with this signature. Record that we've seen
2791 // a section group, and don't include this section group.
2792 ins
.first
->second
.group_
= true;
2797 // We've already seen a linkonce section and this is a linkonce
2798 // section. These don't block each other--this may be the same
2799 // symbol name with different section types.
2804 // Find the given comdat signature, and return the object and section
2805 // index of the kept group.
2807 Layout::find_kept_object(const std::string
& signature
,
2808 unsigned int* pshndx
) const
2810 Signatures::const_iterator p
= this->signatures_
.find(signature
);
2811 if (p
== this->signatures_
.end())
2814 *pshndx
= p
->second
.shndx_
;
2815 return p
->second
.object_
;
2818 // Store the allocated sections into the section list.
2821 Layout::get_allocated_sections(Section_list
* section_list
) const
2823 for (Section_list::const_iterator p
= this->section_list_
.begin();
2824 p
!= this->section_list_
.end();
2826 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0)
2827 section_list
->push_back(*p
);
2830 // Create an output segment.
2833 Layout::make_output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
2835 gold_assert(!parameters
->options().relocatable());
2836 Output_segment
* oseg
= new Output_segment(type
, flags
);
2837 this->segment_list_
.push_back(oseg
);
2841 // Write out the Output_sections. Most won't have anything to write,
2842 // since most of the data will come from input sections which are
2843 // handled elsewhere. But some Output_sections do have Output_data.
2846 Layout::write_output_sections(Output_file
* of
) const
2848 for (Section_list::const_iterator p
= this->section_list_
.begin();
2849 p
!= this->section_list_
.end();
2852 if (!(*p
)->after_input_sections())
2857 // Write out data not associated with a section or the symbol table.
2860 Layout::write_data(const Symbol_table
* symtab
, Output_file
* of
) const
2862 if (!parameters
->options().strip_all())
2864 const Output_section
* symtab_section
= this->symtab_section_
;
2865 for (Section_list::const_iterator p
= this->section_list_
.begin();
2866 p
!= this->section_list_
.end();
2869 if ((*p
)->needs_symtab_index())
2871 gold_assert(symtab_section
!= NULL
);
2872 unsigned int index
= (*p
)->symtab_index();
2873 gold_assert(index
> 0 && index
!= -1U);
2874 off_t off
= (symtab_section
->offset()
2875 + index
* symtab_section
->entsize());
2876 symtab
->write_section_symbol(*p
, this->symtab_xindex_
, of
, off
);
2881 const Output_section
* dynsym_section
= this->dynsym_section_
;
2882 for (Section_list::const_iterator p
= this->section_list_
.begin();
2883 p
!= this->section_list_
.end();
2886 if ((*p
)->needs_dynsym_index())
2888 gold_assert(dynsym_section
!= NULL
);
2889 unsigned int index
= (*p
)->dynsym_index();
2890 gold_assert(index
> 0 && index
!= -1U);
2891 off_t off
= (dynsym_section
->offset()
2892 + index
* dynsym_section
->entsize());
2893 symtab
->write_section_symbol(*p
, this->dynsym_xindex_
, of
, off
);
2897 // Write out the Output_data which are not in an Output_section.
2898 for (Data_list::const_iterator p
= this->special_output_list_
.begin();
2899 p
!= this->special_output_list_
.end();
2904 // Write out the Output_sections which can only be written after the
2905 // input sections are complete.
2908 Layout::write_sections_after_input_sections(Output_file
* of
)
2910 // Determine the final section offsets, and thus the final output
2911 // file size. Note we finalize the .shstrab last, to allow the
2912 // after_input_section sections to modify their section-names before
2914 if (this->any_postprocessing_sections_
)
2916 off_t off
= this->output_file_size_
;
2917 off
= this->set_section_offsets(off
, POSTPROCESSING_SECTIONS_PASS
);
2919 // Now that we've finalized the names, we can finalize the shstrab.
2921 this->set_section_offsets(off
,
2922 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
2924 if (off
> this->output_file_size_
)
2927 this->output_file_size_
= off
;
2931 for (Section_list::const_iterator p
= this->section_list_
.begin();
2932 p
!= this->section_list_
.end();
2935 if ((*p
)->after_input_sections())
2939 this->section_headers_
->write(of
);
2942 // If the build ID requires computing a checksum, do so here, and
2943 // write it out. We compute a checksum over the entire file because
2944 // that is simplest.
2947 Layout::write_build_id(Output_file
* of
) const
2949 if (this->build_id_note_
== NULL
)
2952 const unsigned char* iv
= of
->get_input_view(0, this->output_file_size_
);
2954 unsigned char* ov
= of
->get_output_view(this->build_id_note_
->offset(),
2955 this->build_id_note_
->data_size());
2957 const char* style
= parameters
->options().build_id();
2958 if (strcmp(style
, "sha1") == 0)
2961 sha1_init_ctx(&ctx
);
2962 sha1_process_bytes(iv
, this->output_file_size_
, &ctx
);
2963 sha1_finish_ctx(&ctx
, ov
);
2965 else if (strcmp(style
, "md5") == 0)
2969 md5_process_bytes(iv
, this->output_file_size_
, &ctx
);
2970 md5_finish_ctx(&ctx
, ov
);
2975 of
->write_output_view(this->build_id_note_
->offset(),
2976 this->build_id_note_
->data_size(),
2979 of
->free_input_view(0, this->output_file_size_
, iv
);
2982 // Write out a binary file. This is called after the link is
2983 // complete. IN is the temporary output file we used to generate the
2984 // ELF code. We simply walk through the segments, read them from
2985 // their file offset in IN, and write them to their load address in
2986 // the output file. FIXME: with a bit more work, we could support
2987 // S-records and/or Intel hex format here.
2990 Layout::write_binary(Output_file
* in
) const
2992 gold_assert(this->options_
.oformat_enum()
2993 == General_options::OBJECT_FORMAT_BINARY
);
2995 // Get the size of the binary file.
2996 uint64_t max_load_address
= 0;
2997 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
2998 p
!= this->segment_list_
.end();
3001 if ((*p
)->type() == elfcpp::PT_LOAD
&& (*p
)->filesz() > 0)
3003 uint64_t max_paddr
= (*p
)->paddr() + (*p
)->filesz();
3004 if (max_paddr
> max_load_address
)
3005 max_load_address
= max_paddr
;
3009 Output_file
out(parameters
->options().output_file_name());
3010 out
.open(max_load_address
);
3012 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
3013 p
!= this->segment_list_
.end();
3016 if ((*p
)->type() == elfcpp::PT_LOAD
&& (*p
)->filesz() > 0)
3018 const unsigned char* vin
= in
->get_input_view((*p
)->offset(),
3020 unsigned char* vout
= out
.get_output_view((*p
)->paddr(),
3022 memcpy(vout
, vin
, (*p
)->filesz());
3023 out
.write_output_view((*p
)->paddr(), (*p
)->filesz(), vout
);
3024 in
->free_input_view((*p
)->offset(), (*p
)->filesz(), vin
);
3031 // Print statistical information to stderr. This is used for --stats.
3034 Layout::print_stats() const
3036 this->namepool_
.print_stats("section name pool");
3037 this->sympool_
.print_stats("output symbol name pool");
3038 this->dynpool_
.print_stats("dynamic name pool");
3040 for (Section_list::const_iterator p
= this->section_list_
.begin();
3041 p
!= this->section_list_
.end();
3043 (*p
)->print_merge_stats();
3046 // Write_sections_task methods.
3048 // We can always run this task.
3051 Write_sections_task::is_runnable()
3056 // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER
3060 Write_sections_task::locks(Task_locker
* tl
)
3062 tl
->add(this, this->output_sections_blocker_
);
3063 tl
->add(this, this->final_blocker_
);
3066 // Run the task--write out the data.
3069 Write_sections_task::run(Workqueue
*)
3071 this->layout_
->write_output_sections(this->of_
);
3074 // Write_data_task methods.
3076 // We can always run this task.
3079 Write_data_task::is_runnable()
3084 // We need to unlock FINAL_BLOCKER when finished.
3087 Write_data_task::locks(Task_locker
* tl
)
3089 tl
->add(this, this->final_blocker_
);
3092 // Run the task--write out the data.
3095 Write_data_task::run(Workqueue
*)
3097 this->layout_
->write_data(this->symtab_
, this->of_
);
3100 // Write_symbols_task methods.
3102 // We can always run this task.
3105 Write_symbols_task::is_runnable()
3110 // We need to unlock FINAL_BLOCKER when finished.
3113 Write_symbols_task::locks(Task_locker
* tl
)
3115 tl
->add(this, this->final_blocker_
);
3118 // Run the task--write out the symbols.
3121 Write_symbols_task::run(Workqueue
*)
3123 this->symtab_
->write_globals(this->input_objects_
, this->sympool_
,
3124 this->dynpool_
, this->layout_
->symtab_xindex(),
3125 this->layout_
->dynsym_xindex(), this->of_
);
3128 // Write_after_input_sections_task methods.
3130 // We can only run this task after the input sections have completed.
3133 Write_after_input_sections_task::is_runnable()
3135 if (this->input_sections_blocker_
->is_blocked())
3136 return this->input_sections_blocker_
;
3140 // We need to unlock FINAL_BLOCKER when finished.
3143 Write_after_input_sections_task::locks(Task_locker
* tl
)
3145 tl
->add(this, this->final_blocker_
);
3151 Write_after_input_sections_task::run(Workqueue
*)
3153 this->layout_
->write_sections_after_input_sections(this->of_
);
3156 // Close_task_runner methods.
3158 // Run the task--close the file.
3161 Close_task_runner::run(Workqueue
*, const Task
*)
3163 // If we need to compute a checksum for the BUILD if, we do so here.
3164 this->layout_
->write_build_id(this->of_
);
3166 // If we've been asked to create a binary file, we do so here.
3167 if (this->options_
->oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
3168 this->layout_
->write_binary(this->of_
);
3173 // Instantiate the templates we need. We could use the configure
3174 // script to restrict this to only the ones for implemented targets.
3176 #ifdef HAVE_TARGET_32_LITTLE
3179 Layout::layout
<32, false>(Sized_relobj
<32, false>* object
, unsigned int shndx
,
3181 const elfcpp::Shdr
<32, false>& shdr
,
3182 unsigned int, unsigned int, off_t
*);
3185 #ifdef HAVE_TARGET_32_BIG
3188 Layout::layout
<32, true>(Sized_relobj
<32, true>* object
, unsigned int shndx
,
3190 const elfcpp::Shdr
<32, true>& shdr
,
3191 unsigned int, unsigned int, off_t
*);
3194 #ifdef HAVE_TARGET_64_LITTLE
3197 Layout::layout
<64, false>(Sized_relobj
<64, false>* object
, unsigned int shndx
,
3199 const elfcpp::Shdr
<64, false>& shdr
,
3200 unsigned int, unsigned int, off_t
*);
3203 #ifdef HAVE_TARGET_64_BIG
3206 Layout::layout
<64, true>(Sized_relobj
<64, true>* object
, unsigned int shndx
,
3208 const elfcpp::Shdr
<64, true>& shdr
,
3209 unsigned int, unsigned int, off_t
*);
3212 #ifdef HAVE_TARGET_32_LITTLE
3215 Layout::layout_reloc
<32, false>(Sized_relobj
<32, false>* object
,
3216 unsigned int reloc_shndx
,
3217 const elfcpp::Shdr
<32, false>& shdr
,
3218 Output_section
* data_section
,
3219 Relocatable_relocs
* rr
);
3222 #ifdef HAVE_TARGET_32_BIG
3225 Layout::layout_reloc
<32, true>(Sized_relobj
<32, true>* object
,
3226 unsigned int reloc_shndx
,
3227 const elfcpp::Shdr
<32, true>& shdr
,
3228 Output_section
* data_section
,
3229 Relocatable_relocs
* rr
);
3232 #ifdef HAVE_TARGET_64_LITTLE
3235 Layout::layout_reloc
<64, false>(Sized_relobj
<64, false>* object
,
3236 unsigned int reloc_shndx
,
3237 const elfcpp::Shdr
<64, false>& shdr
,
3238 Output_section
* data_section
,
3239 Relocatable_relocs
* rr
);
3242 #ifdef HAVE_TARGET_64_BIG
3245 Layout::layout_reloc
<64, true>(Sized_relobj
<64, true>* object
,
3246 unsigned int reloc_shndx
,
3247 const elfcpp::Shdr
<64, true>& shdr
,
3248 Output_section
* data_section
,
3249 Relocatable_relocs
* rr
);
3252 #ifdef HAVE_TARGET_32_LITTLE
3255 Layout::layout_group
<32, false>(Symbol_table
* symtab
,
3256 Sized_relobj
<32, false>* object
,
3258 const char* group_section_name
,
3259 const char* signature
,
3260 const elfcpp::Shdr
<32, false>& shdr
,
3261 const elfcpp::Elf_Word
* contents
);
3264 #ifdef HAVE_TARGET_32_BIG
3267 Layout::layout_group
<32, true>(Symbol_table
* symtab
,
3268 Sized_relobj
<32, true>* object
,
3270 const char* group_section_name
,
3271 const char* signature
,
3272 const elfcpp::Shdr
<32, true>& shdr
,
3273 const elfcpp::Elf_Word
* contents
);
3276 #ifdef HAVE_TARGET_64_LITTLE
3279 Layout::layout_group
<64, false>(Symbol_table
* symtab
,
3280 Sized_relobj
<64, false>* object
,
3282 const char* group_section_name
,
3283 const char* signature
,
3284 const elfcpp::Shdr
<64, false>& shdr
,
3285 const elfcpp::Elf_Word
* contents
);
3288 #ifdef HAVE_TARGET_64_BIG
3291 Layout::layout_group
<64, true>(Symbol_table
* symtab
,
3292 Sized_relobj
<64, true>* object
,
3294 const char* group_section_name
,
3295 const char* signature
,
3296 const elfcpp::Shdr
<64, true>& shdr
,
3297 const elfcpp::Elf_Word
* contents
);
3300 #ifdef HAVE_TARGET_32_LITTLE
3303 Layout::layout_eh_frame
<32, false>(Sized_relobj
<32, false>* object
,
3304 const unsigned char* symbols
,
3306 const unsigned char* symbol_names
,
3307 off_t symbol_names_size
,
3309 const elfcpp::Shdr
<32, false>& shdr
,
3310 unsigned int reloc_shndx
,
3311 unsigned int reloc_type
,
3315 #ifdef HAVE_TARGET_32_BIG
3318 Layout::layout_eh_frame
<32, true>(Sized_relobj
<32, true>* object
,
3319 const unsigned char* symbols
,
3321 const unsigned char* symbol_names
,
3322 off_t symbol_names_size
,
3324 const elfcpp::Shdr
<32, true>& shdr
,
3325 unsigned int reloc_shndx
,
3326 unsigned int reloc_type
,
3330 #ifdef HAVE_TARGET_64_LITTLE
3333 Layout::layout_eh_frame
<64, false>(Sized_relobj
<64, false>* object
,
3334 const unsigned char* symbols
,
3336 const unsigned char* symbol_names
,
3337 off_t symbol_names_size
,
3339 const elfcpp::Shdr
<64, false>& shdr
,
3340 unsigned int reloc_shndx
,
3341 unsigned int reloc_type
,
3345 #ifdef HAVE_TARGET_64_BIG
3348 Layout::layout_eh_frame
<64, true>(Sized_relobj
<64, true>* object
,
3349 const unsigned char* symbols
,
3351 const unsigned char* symbol_names
,
3352 off_t symbol_names_size
,
3354 const elfcpp::Shdr
<64, true>& shdr
,
3355 unsigned int reloc_shndx
,
3356 unsigned int reloc_type
,
3360 } // End namespace gold.