1 // layout.cc -- lay out output file sections for gold
3 // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
32 #include "libiberty.h"
36 #include "parameters.h"
40 #include "script-sections.h"
45 #include "compressed_output.h"
46 #include "reduced_debug_output.h"
48 #include "descriptors.h"
50 #include "incremental.h"
56 // Layout::Relaxation_debug_check methods.
58 // Check that sections and special data are in reset states.
59 // We do not save states for Output_sections and special Output_data.
60 // So we check that they have not assigned any addresses or offsets.
61 // clean_up_after_relaxation simply resets their addresses and offsets.
63 Layout::Relaxation_debug_check::check_output_data_for_reset_values(
64 const Layout::Section_list
& sections
,
65 const Layout::Data_list
& special_outputs
)
67 for(Layout::Section_list::const_iterator p
= sections
.begin();
70 gold_assert((*p
)->address_and_file_offset_have_reset_values());
72 for(Layout::Data_list::const_iterator p
= special_outputs
.begin();
73 p
!= special_outputs
.end();
75 gold_assert((*p
)->address_and_file_offset_have_reset_values());
78 // Save information of SECTIONS for checking later.
81 Layout::Relaxation_debug_check::read_sections(
82 const Layout::Section_list
& sections
)
84 for(Layout::Section_list::const_iterator p
= sections
.begin();
88 Output_section
* os
= *p
;
90 info
.output_section
= os
;
91 info
.address
= os
->is_address_valid() ? os
->address() : 0;
92 info
.data_size
= os
->is_data_size_valid() ? os
->data_size() : -1;
93 info
.offset
= os
->is_offset_valid()? os
->offset() : -1 ;
94 this->section_infos_
.push_back(info
);
98 // Verify SECTIONS using previously recorded information.
101 Layout::Relaxation_debug_check::verify_sections(
102 const Layout::Section_list
& sections
)
105 for(Layout::Section_list::const_iterator p
= sections
.begin();
109 Output_section
* os
= *p
;
110 uint64_t address
= os
->is_address_valid() ? os
->address() : 0;
111 off_t data_size
= os
->is_data_size_valid() ? os
->data_size() : -1;
112 off_t offset
= os
->is_offset_valid()? os
->offset() : -1 ;
114 if (i
>= this->section_infos_
.size())
116 gold_fatal("Section_info of %s missing.\n", os
->name());
118 const Section_info
& info
= this->section_infos_
[i
];
119 if (os
!= info
.output_section
)
120 gold_fatal("Section order changed. Expecting %s but see %s\n",
121 info
.output_section
->name(), os
->name());
122 if (address
!= info
.address
123 || data_size
!= info
.data_size
124 || offset
!= info
.offset
)
125 gold_fatal("Section %s changed.\n", os
->name());
129 // Layout_task_runner methods.
131 // Lay out the sections. This is called after all the input objects
135 Layout_task_runner::run(Workqueue
* workqueue
, const Task
* task
)
137 off_t file_size
= this->layout_
->finalize(this->input_objects_
,
142 // Now we know the final size of the output file and we know where
143 // each piece of information goes.
145 if (this->mapfile_
!= NULL
)
147 this->mapfile_
->print_discarded_sections(this->input_objects_
);
148 this->layout_
->print_to_mapfile(this->mapfile_
);
151 Output_file
* of
= new Output_file(parameters
->options().output_file_name());
152 if (this->options_
.oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
153 of
->set_is_temporary();
156 // Queue up the final set of tasks.
157 gold::queue_final_tasks(this->options_
, this->input_objects_
,
158 this->symtab_
, this->layout_
, workqueue
, of
);
163 Layout::Layout(int number_of_input_files
, Script_options
* script_options
)
164 : number_of_input_files_(number_of_input_files
),
165 script_options_(script_options
),
173 unattached_section_list_(),
174 special_output_list_(),
175 section_headers_(NULL
),
177 relro_segment_(NULL
),
178 symtab_section_(NULL
),
179 symtab_xindex_(NULL
),
180 dynsym_section_(NULL
),
181 dynsym_xindex_(NULL
),
182 dynamic_section_(NULL
),
184 eh_frame_section_(NULL
),
185 eh_frame_data_(NULL
),
186 added_eh_frame_data_(false),
187 eh_frame_hdr_section_(NULL
),
188 build_id_note_(NULL
),
192 output_file_size_(-1),
193 sections_are_attached_(false),
194 input_requires_executable_stack_(false),
195 input_with_gnu_stack_note_(false),
196 input_without_gnu_stack_note_(false),
197 has_static_tls_(false),
198 any_postprocessing_sections_(false),
199 resized_signatures_(false),
200 have_stabstr_section_(false),
201 incremental_inputs_(NULL
),
202 record_output_section_data_from_script_(false),
203 script_output_section_data_list_(),
204 segment_states_(NULL
),
205 relaxation_debug_check_(NULL
)
207 // Make space for more than enough segments for a typical file.
208 // This is just for efficiency--it's OK if we wind up needing more.
209 this->segment_list_
.reserve(12);
211 // We expect two unattached Output_data objects: the file header and
212 // the segment headers.
213 this->special_output_list_
.reserve(2);
215 // Initialize structure needed for an incremental build.
216 if (parameters
->options().incremental())
217 this->incremental_inputs_
= new Incremental_inputs
;
219 // The section name pool is worth optimizing in all cases, because
220 // it is small, but there are often overlaps due to .rel sections.
221 this->namepool_
.set_optimize();
224 // Hash a key we use to look up an output section mapping.
227 Layout::Hash_key::operator()(const Layout::Key
& k
) const
229 return k
.first
+ k
.second
.first
+ k
.second
.second
;
232 // Returns whether the given section is in the list of
233 // debug-sections-used-by-some-version-of-gdb. Currently,
234 // we've checked versions of gdb up to and including 6.7.1.
236 static const char* gdb_sections
[] =
238 // ".debug_aranges", // not used by gdb as of 6.7.1
244 // ".debug_pubnames", // not used by gdb as of 6.7.1
249 static const char* lines_only_debug_sections
[] =
251 // ".debug_aranges", // not used by gdb as of 6.7.1
257 // ".debug_pubnames", // not used by gdb as of 6.7.1
263 is_gdb_debug_section(const char* str
)
265 // We can do this faster: binary search or a hashtable. But why bother?
266 for (size_t i
= 0; i
< sizeof(gdb_sections
)/sizeof(*gdb_sections
); ++i
)
267 if (strcmp(str
, gdb_sections
[i
]) == 0)
273 is_lines_only_debug_section(const char* str
)
275 // We can do this faster: binary search or a hashtable. But why bother?
277 i
< sizeof(lines_only_debug_sections
)/sizeof(*lines_only_debug_sections
);
279 if (strcmp(str
, lines_only_debug_sections
[i
]) == 0)
284 // Whether to include this section in the link.
286 template<int size
, bool big_endian
>
288 Layout::include_section(Sized_relobj
<size
, big_endian
>*, const char* name
,
289 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
291 if (shdr
.get_sh_flags() & elfcpp::SHF_EXCLUDE
)
294 switch (shdr
.get_sh_type())
296 case elfcpp::SHT_NULL
:
297 case elfcpp::SHT_SYMTAB
:
298 case elfcpp::SHT_DYNSYM
:
299 case elfcpp::SHT_HASH
:
300 case elfcpp::SHT_DYNAMIC
:
301 case elfcpp::SHT_SYMTAB_SHNDX
:
304 case elfcpp::SHT_STRTAB
:
305 // Discard the sections which have special meanings in the ELF
306 // ABI. Keep others (e.g., .stabstr). We could also do this by
307 // checking the sh_link fields of the appropriate sections.
308 return (strcmp(name
, ".dynstr") != 0
309 && strcmp(name
, ".strtab") != 0
310 && strcmp(name
, ".shstrtab") != 0);
312 case elfcpp::SHT_RELA
:
313 case elfcpp::SHT_REL
:
314 case elfcpp::SHT_GROUP
:
315 // If we are emitting relocations these should be handled
317 gold_assert(!parameters
->options().relocatable()
318 && !parameters
->options().emit_relocs());
321 case elfcpp::SHT_PROGBITS
:
322 if (parameters
->options().strip_debug()
323 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
325 if (is_debug_info_section(name
))
328 if (parameters
->options().strip_debug_non_line()
329 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
331 // Debugging sections can only be recognized by name.
332 if (is_prefix_of(".debug", name
)
333 && !is_lines_only_debug_section(name
))
336 if (parameters
->options().strip_debug_gdb()
337 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
339 // Debugging sections can only be recognized by name.
340 if (is_prefix_of(".debug", name
)
341 && !is_gdb_debug_section(name
))
344 if (parameters
->options().strip_lto_sections()
345 && !parameters
->options().relocatable()
346 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
348 // Ignore LTO sections containing intermediate code.
349 if (is_prefix_of(".gnu.lto_", name
))
359 // Return an output section named NAME, or NULL if there is none.
362 Layout::find_output_section(const char* name
) const
364 for (Section_list::const_iterator p
= this->section_list_
.begin();
365 p
!= this->section_list_
.end();
367 if (strcmp((*p
)->name(), name
) == 0)
372 // Return an output segment of type TYPE, with segment flags SET set
373 // and segment flags CLEAR clear. Return NULL if there is none.
376 Layout::find_output_segment(elfcpp::PT type
, elfcpp::Elf_Word set
,
377 elfcpp::Elf_Word clear
) const
379 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
380 p
!= this->segment_list_
.end();
382 if (static_cast<elfcpp::PT
>((*p
)->type()) == type
383 && ((*p
)->flags() & set
) == set
384 && ((*p
)->flags() & clear
) == 0)
389 // Return the output section to use for section NAME with type TYPE
390 // and section flags FLAGS. NAME must be canonicalized in the string
391 // pool, and NAME_KEY is the key. IS_INTERP is true if this is the
392 // .interp section. IS_DYNAMIC_LINKER_SECTION is true if this section
393 // is used by the dynamic linker.
396 Layout::get_output_section(const char* name
, Stringpool::Key name_key
,
397 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
,
398 bool is_interp
, bool is_dynamic_linker_section
)
400 elfcpp::Elf_Xword lookup_flags
= flags
;
402 // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine
403 // read-write with read-only sections. Some other ELF linkers do
404 // not do this. FIXME: Perhaps there should be an option
406 lookup_flags
&= ~(elfcpp::SHF_WRITE
| elfcpp::SHF_EXECINSTR
);
408 const Key
key(name_key
, std::make_pair(type
, lookup_flags
));
409 const std::pair
<Key
, Output_section
*> v(key
, NULL
);
410 std::pair
<Section_name_map::iterator
, bool> ins(
411 this->section_name_map_
.insert(v
));
414 return ins
.first
->second
;
417 // This is the first time we've seen this name/type/flags
418 // combination. For compatibility with the GNU linker, we
419 // combine sections with contents and zero flags with sections
420 // with non-zero flags. This is a workaround for cases where
421 // assembler code forgets to set section flags. FIXME: Perhaps
422 // there should be an option to control this.
423 Output_section
* os
= NULL
;
425 if (type
== elfcpp::SHT_PROGBITS
)
429 Output_section
* same_name
= this->find_output_section(name
);
430 if (same_name
!= NULL
431 && same_name
->type() == elfcpp::SHT_PROGBITS
432 && (same_name
->flags() & elfcpp::SHF_TLS
) == 0)
435 else if ((flags
& elfcpp::SHF_TLS
) == 0)
437 elfcpp::Elf_Xword zero_flags
= 0;
438 const Key
zero_key(name_key
, std::make_pair(type
, zero_flags
));
439 Section_name_map::iterator p
=
440 this->section_name_map_
.find(zero_key
);
441 if (p
!= this->section_name_map_
.end())
447 os
= this->make_output_section(name
, type
, flags
, is_interp
,
448 is_dynamic_linker_section
);
449 ins
.first
->second
= os
;
454 // Pick the output section to use for section NAME, in input file
455 // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a
456 // linker created section. IS_INPUT_SECTION is true if we are
457 // choosing an output section for an input section found in a input
458 // file. IS_INTERP is true if this is the .interp section.
459 // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the
460 // dynamic linker. This will return NULL if the input section should
464 Layout::choose_output_section(const Relobj
* relobj
, const char* name
,
465 elfcpp::Elf_Word type
, elfcpp::Elf_Xword flags
,
466 bool is_input_section
, bool is_interp
,
467 bool is_dynamic_linker_section
)
469 // We should not see any input sections after we have attached
470 // sections to segments.
471 gold_assert(!is_input_section
|| !this->sections_are_attached_
);
473 // Some flags in the input section should not be automatically
474 // copied to the output section.
475 flags
&= ~ (elfcpp::SHF_INFO_LINK
476 | elfcpp::SHF_LINK_ORDER
479 | elfcpp::SHF_STRINGS
);
481 if (this->script_options_
->saw_sections_clause())
483 // We are using a SECTIONS clause, so the output section is
484 // chosen based only on the name.
486 Script_sections
* ss
= this->script_options_
->script_sections();
487 const char* file_name
= relobj
== NULL
? NULL
: relobj
->name().c_str();
488 Output_section
** output_section_slot
;
489 name
= ss
->output_section_name(file_name
, name
, &output_section_slot
);
492 // The SECTIONS clause says to discard this input section.
496 // If this is an orphan section--one not mentioned in the linker
497 // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the
498 // default processing below.
500 if (output_section_slot
!= NULL
)
502 if (*output_section_slot
!= NULL
)
504 (*output_section_slot
)->update_flags_for_input_section(flags
);
505 return *output_section_slot
;
508 // We don't put sections found in the linker script into
509 // SECTION_NAME_MAP_. That keeps us from getting confused
510 // if an orphan section is mapped to a section with the same
511 // name as one in the linker script.
513 name
= this->namepool_
.add(name
, false, NULL
);
516 this->make_output_section(name
, type
, flags
, is_interp
,
517 is_dynamic_linker_section
);
518 os
->set_found_in_sections_clause();
519 *output_section_slot
= os
;
524 // FIXME: Handle SHF_OS_NONCONFORMING somewhere.
526 // Turn NAME from the name of the input section into the name of the
529 size_t len
= strlen(name
);
531 && !this->script_options_
->saw_sections_clause()
532 && !parameters
->options().relocatable())
533 name
= Layout::output_section_name(name
, &len
);
535 Stringpool::Key name_key
;
536 name
= this->namepool_
.add_with_length(name
, len
, true, &name_key
);
538 // Find or make the output section. The output section is selected
539 // based on the section name, type, and flags.
540 return this->get_output_section(name
, name_key
, type
, flags
, is_interp
,
541 is_dynamic_linker_section
);
544 // Return the output section to use for input section SHNDX, with name
545 // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the
546 // index of a relocation section which applies to this section, or 0
547 // if none, or -1U if more than one. RELOC_TYPE is the type of the
548 // relocation section if there is one. Set *OFF to the offset of this
549 // input section without the output section. Return NULL if the
550 // section should be discarded. Set *OFF to -1 if the section
551 // contents should not be written directly to the output file, but
552 // will instead receive special handling.
554 template<int size
, bool big_endian
>
556 Layout::layout(Sized_relobj
<size
, big_endian
>* object
, unsigned int shndx
,
557 const char* name
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
558 unsigned int reloc_shndx
, unsigned int, off_t
* off
)
562 if (!this->include_section(object
, name
, shdr
))
567 // In a relocatable link a grouped section must not be combined with
568 // any other sections.
569 if (parameters
->options().relocatable()
570 && (shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) != 0)
572 name
= this->namepool_
.add(name
, true, NULL
);
573 os
= this->make_output_section(name
, shdr
.get_sh_type(),
574 shdr
.get_sh_flags(), false, false);
578 os
= this->choose_output_section(object
, name
, shdr
.get_sh_type(),
579 shdr
.get_sh_flags(), true, false,
585 // By default the GNU linker sorts input sections whose names match
586 // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections
587 // are sorted by name. This is used to implement constructor
588 // priority ordering. We are compatible.
589 if (!this->script_options_
->saw_sections_clause()
590 && (is_prefix_of(".ctors.", name
)
591 || is_prefix_of(".dtors.", name
)
592 || is_prefix_of(".init_array.", name
)
593 || is_prefix_of(".fini_array.", name
)))
594 os
->set_must_sort_attached_input_sections();
596 // FIXME: Handle SHF_LINK_ORDER somewhere.
598 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
599 this->script_options_
->saw_sections_clause());
604 // Handle a relocation section when doing a relocatable link.
606 template<int size
, bool big_endian
>
608 Layout::layout_reloc(Sized_relobj
<size
, big_endian
>* object
,
610 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
611 Output_section
* data_section
,
612 Relocatable_relocs
* rr
)
614 gold_assert(parameters
->options().relocatable()
615 || parameters
->options().emit_relocs());
617 int sh_type
= shdr
.get_sh_type();
620 if (sh_type
== elfcpp::SHT_REL
)
622 else if (sh_type
== elfcpp::SHT_RELA
)
626 name
+= data_section
->name();
628 Output_section
* os
= this->choose_output_section(object
, name
.c_str(),
631 false, false, false);
633 os
->set_should_link_to_symtab();
634 os
->set_info_section(data_section
);
636 Output_section_data
* posd
;
637 if (sh_type
== elfcpp::SHT_REL
)
639 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rel_size
);
640 posd
= new Output_relocatable_relocs
<elfcpp::SHT_REL
,
644 else if (sh_type
== elfcpp::SHT_RELA
)
646 os
->set_entsize(elfcpp::Elf_sizes
<size
>::rela_size
);
647 posd
= new Output_relocatable_relocs
<elfcpp::SHT_RELA
,
654 os
->add_output_section_data(posd
);
655 rr
->set_output_data(posd
);
660 // Handle a group section when doing a relocatable link.
662 template<int size
, bool big_endian
>
664 Layout::layout_group(Symbol_table
* symtab
,
665 Sized_relobj
<size
, big_endian
>* object
,
667 const char* group_section_name
,
668 const char* signature
,
669 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
670 elfcpp::Elf_Word flags
,
671 std::vector
<unsigned int>* shndxes
)
673 gold_assert(parameters
->options().relocatable());
674 gold_assert(shdr
.get_sh_type() == elfcpp::SHT_GROUP
);
675 group_section_name
= this->namepool_
.add(group_section_name
, true, NULL
);
676 Output_section
* os
= this->make_output_section(group_section_name
,
681 // We need to find a symbol with the signature in the symbol table.
682 // If we don't find one now, we need to look again later.
683 Symbol
* sym
= symtab
->lookup(signature
, NULL
);
685 os
->set_info_symndx(sym
);
688 // Reserve some space to minimize reallocations.
689 if (this->group_signatures_
.empty())
690 this->group_signatures_
.reserve(this->number_of_input_files_
* 16);
692 // We will wind up using a symbol whose name is the signature.
693 // So just put the signature in the symbol name pool to save it.
694 signature
= symtab
->canonicalize_name(signature
);
695 this->group_signatures_
.push_back(Group_signature(os
, signature
));
698 os
->set_should_link_to_symtab();
701 section_size_type entry_count
=
702 convert_to_section_size_type(shdr
.get_sh_size() / 4);
703 Output_section_data
* posd
=
704 new Output_data_group
<size
, big_endian
>(object
, entry_count
, flags
,
706 os
->add_output_section_data(posd
);
709 // Special GNU handling of sections name .eh_frame. They will
710 // normally hold exception frame data as defined by the C++ ABI
711 // (http://codesourcery.com/cxx-abi/).
713 template<int size
, bool big_endian
>
715 Layout::layout_eh_frame(Sized_relobj
<size
, big_endian
>* object
,
716 const unsigned char* symbols
,
718 const unsigned char* symbol_names
,
719 off_t symbol_names_size
,
721 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
722 unsigned int reloc_shndx
, unsigned int reloc_type
,
725 gold_assert(shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
);
726 gold_assert((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
728 const char* const name
= ".eh_frame";
729 Output_section
* os
= this->choose_output_section(object
,
731 elfcpp::SHT_PROGBITS
,
733 false, false, false);
737 if (this->eh_frame_section_
== NULL
)
739 this->eh_frame_section_
= os
;
740 this->eh_frame_data_
= new Eh_frame();
742 if (parameters
->options().eh_frame_hdr())
744 Output_section
* hdr_os
=
745 this->choose_output_section(NULL
,
747 elfcpp::SHT_PROGBITS
,
749 false, false, false);
753 Eh_frame_hdr
* hdr_posd
= new Eh_frame_hdr(os
,
754 this->eh_frame_data_
);
755 hdr_os
->add_output_section_data(hdr_posd
);
757 hdr_os
->set_after_input_sections();
759 if (!this->script_options_
->saw_phdrs_clause())
761 Output_segment
* hdr_oseg
;
762 hdr_oseg
= this->make_output_segment(elfcpp::PT_GNU_EH_FRAME
,
764 hdr_oseg
->add_output_section(hdr_os
, elfcpp::PF_R
, false);
767 this->eh_frame_data_
->set_eh_frame_hdr(hdr_posd
);
772 gold_assert(this->eh_frame_section_
== os
);
774 if (this->eh_frame_data_
->add_ehframe_input_section(object
,
783 os
->update_flags_for_input_section(shdr
.get_sh_flags());
785 // We found a .eh_frame section we are going to optimize, so now
786 // we can add the set of optimized sections to the output
787 // section. We need to postpone adding this until we've found a
788 // section we can optimize so that the .eh_frame section in
789 // crtbegin.o winds up at the start of the output section.
790 if (!this->added_eh_frame_data_
)
792 os
->add_output_section_data(this->eh_frame_data_
);
793 this->added_eh_frame_data_
= true;
799 // We couldn't handle this .eh_frame section for some reason.
800 // Add it as a normal section.
801 bool saw_sections_clause
= this->script_options_
->saw_sections_clause();
802 *off
= os
->add_input_section(object
, shndx
, name
, shdr
, reloc_shndx
,
803 saw_sections_clause
);
809 // Add POSD to an output section using NAME, TYPE, and FLAGS. Return
810 // the output section.
813 Layout::add_output_section_data(const char* name
, elfcpp::Elf_Word type
,
814 elfcpp::Elf_Xword flags
,
815 Output_section_data
* posd
,
816 bool is_dynamic_linker_section
)
818 Output_section
* os
= this->choose_output_section(NULL
, name
, type
, flags
,
820 is_dynamic_linker_section
);
822 os
->add_output_section_data(posd
);
826 // Map section flags to segment flags.
829 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags
)
831 elfcpp::Elf_Word ret
= elfcpp::PF_R
;
832 if ((flags
& elfcpp::SHF_WRITE
) != 0)
834 if ((flags
& elfcpp::SHF_EXECINSTR
) != 0)
839 // Sometimes we compress sections. This is typically done for
840 // sections that are not part of normal program execution (such as
841 // .debug_* sections), and where the readers of these sections know
842 // how to deal with compressed sections. This routine doesn't say for
843 // certain whether we'll compress -- it depends on commandline options
844 // as well -- just whether this section is a candidate for compression.
845 // (The Output_compressed_section class decides whether to compress
846 // a given section, and picks the name of the compressed section.)
849 is_compressible_debug_section(const char* secname
)
851 return (strncmp(secname
, ".debug", sizeof(".debug") - 1) == 0);
854 // Make a new Output_section, and attach it to segments as
855 // appropriate. IS_INTERP is true if this is the .interp section.
856 // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the
860 Layout::make_output_section(const char* name
, elfcpp::Elf_Word type
,
861 elfcpp::Elf_Xword flags
, bool is_interp
,
862 bool is_dynamic_linker_section
)
865 if ((flags
& elfcpp::SHF_ALLOC
) == 0
866 && strcmp(parameters
->options().compress_debug_sections(), "none") != 0
867 && is_compressible_debug_section(name
))
868 os
= new Output_compressed_section(¶meters
->options(), name
, type
,
870 else if ((flags
& elfcpp::SHF_ALLOC
) == 0
871 && parameters
->options().strip_debug_non_line()
872 && strcmp(".debug_abbrev", name
) == 0)
874 os
= this->debug_abbrev_
= new Output_reduced_debug_abbrev_section(
876 if (this->debug_info_
)
877 this->debug_info_
->set_abbreviations(this->debug_abbrev_
);
879 else if ((flags
& elfcpp::SHF_ALLOC
) == 0
880 && parameters
->options().strip_debug_non_line()
881 && strcmp(".debug_info", name
) == 0)
883 os
= this->debug_info_
= new Output_reduced_debug_info_section(
885 if (this->debug_abbrev_
)
886 this->debug_info_
->set_abbreviations(this->debug_abbrev_
);
890 // FIXME: const_cast is ugly.
891 Target
* target
= const_cast<Target
*>(¶meters
->target());
892 os
= target
->make_output_section(name
, type
, flags
);
897 if (is_dynamic_linker_section
)
898 os
->set_is_dynamic_linker_section();
900 parameters
->target().new_output_section(os
);
902 this->section_list_
.push_back(os
);
904 // The GNU linker by default sorts some sections by priority, so we
905 // do the same. We need to know that this might happen before we
906 // attach any input sections.
907 if (!this->script_options_
->saw_sections_clause()
908 && (strcmp(name
, ".ctors") == 0
909 || strcmp(name
, ".dtors") == 0
910 || strcmp(name
, ".init_array") == 0
911 || strcmp(name
, ".fini_array") == 0))
912 os
->set_may_sort_attached_input_sections();
914 // With -z relro, we have to recognize the special sections by name.
915 // There is no other way.
916 if (!this->script_options_
->saw_sections_clause()
917 && parameters
->options().relro()
918 && type
== elfcpp::SHT_PROGBITS
919 && (flags
& elfcpp::SHF_ALLOC
) != 0
920 && (flags
& elfcpp::SHF_WRITE
) != 0)
922 if (strcmp(name
, ".data.rel.ro") == 0)
924 else if (strcmp(name
, ".data.rel.ro.local") == 0)
927 os
->set_is_relro_local();
931 // Check for .stab*str sections, as .stab* sections need to link to
933 if (type
== elfcpp::SHT_STRTAB
934 && !this->have_stabstr_section_
935 && strncmp(name
, ".stab", 5) == 0
936 && strcmp(name
+ strlen(name
) - 3, "str") == 0)
937 this->have_stabstr_section_
= true;
939 // If we have already attached the sections to segments, then we
940 // need to attach this one now. This happens for sections created
941 // directly by the linker.
942 if (this->sections_are_attached_
)
943 this->attach_section_to_segment(os
);
948 // Attach output sections to segments. This is called after we have
949 // seen all the input sections.
952 Layout::attach_sections_to_segments()
954 for (Section_list::iterator p
= this->section_list_
.begin();
955 p
!= this->section_list_
.end();
957 this->attach_section_to_segment(*p
);
959 this->sections_are_attached_
= true;
962 // Attach an output section to a segment.
965 Layout::attach_section_to_segment(Output_section
* os
)
967 if ((os
->flags() & elfcpp::SHF_ALLOC
) == 0)
968 this->unattached_section_list_
.push_back(os
);
970 this->attach_allocated_section_to_segment(os
);
973 // Attach an allocated output section to a segment.
976 Layout::attach_allocated_section_to_segment(Output_section
* os
)
978 elfcpp::Elf_Xword flags
= os
->flags();
979 gold_assert((flags
& elfcpp::SHF_ALLOC
) != 0);
981 if (parameters
->options().relocatable())
984 // If we have a SECTIONS clause, we can't handle the attachment to
985 // segments until after we've seen all the sections.
986 if (this->script_options_
->saw_sections_clause())
989 gold_assert(!this->script_options_
->saw_phdrs_clause());
991 // This output section goes into a PT_LOAD segment.
993 elfcpp::Elf_Word seg_flags
= Layout::section_flags_to_segment(flags
);
995 bool sort_sections
= !this->script_options_
->saw_sections_clause();
997 // In general the only thing we really care about for PT_LOAD
998 // segments is whether or not they are writable, so that is how we
999 // search for them. Large data sections also go into their own
1000 // PT_LOAD segment. People who need segments sorted on some other
1001 // basis will have to use a linker script.
1003 Segment_list::const_iterator p
;
1004 for (p
= this->segment_list_
.begin();
1005 p
!= this->segment_list_
.end();
1008 if ((*p
)->type() != elfcpp::PT_LOAD
)
1010 if (!parameters
->options().omagic()
1011 && ((*p
)->flags() & elfcpp::PF_W
) != (seg_flags
& elfcpp::PF_W
))
1013 // If -Tbss was specified, we need to separate the data and BSS
1015 if (parameters
->options().user_set_Tbss())
1017 if ((os
->type() == elfcpp::SHT_NOBITS
)
1018 == (*p
)->has_any_data_sections())
1021 if (os
->is_large_data_section() && !(*p
)->is_large_data_segment())
1024 (*p
)->add_output_section(os
, seg_flags
, sort_sections
);
1028 if (p
== this->segment_list_
.end())
1030 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_LOAD
,
1032 if (os
->is_large_data_section())
1033 oseg
->set_is_large_data_segment();
1034 oseg
->add_output_section(os
, seg_flags
, sort_sections
);
1037 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
1039 if (os
->type() == elfcpp::SHT_NOTE
)
1041 // See if we already have an equivalent PT_NOTE segment.
1042 for (p
= this->segment_list_
.begin();
1043 p
!= segment_list_
.end();
1046 if ((*p
)->type() == elfcpp::PT_NOTE
1047 && (((*p
)->flags() & elfcpp::PF_W
)
1048 == (seg_flags
& elfcpp::PF_W
)))
1050 (*p
)->add_output_section(os
, seg_flags
, false);
1055 if (p
== this->segment_list_
.end())
1057 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_NOTE
,
1059 oseg
->add_output_section(os
, seg_flags
, false);
1063 // If we see a loadable SHF_TLS section, we create a PT_TLS
1064 // segment. There can only be one such segment.
1065 if ((flags
& elfcpp::SHF_TLS
) != 0)
1067 if (this->tls_segment_
== NULL
)
1068 this->make_output_segment(elfcpp::PT_TLS
, seg_flags
);
1069 this->tls_segment_
->add_output_section(os
, seg_flags
, false);
1072 // If -z relro is in effect, and we see a relro section, we create a
1073 // PT_GNU_RELRO segment. There can only be one such segment.
1074 if (os
->is_relro() && parameters
->options().relro())
1076 gold_assert(seg_flags
== (elfcpp::PF_R
| elfcpp::PF_W
));
1077 if (this->relro_segment_
== NULL
)
1078 this->make_output_segment(elfcpp::PT_GNU_RELRO
, seg_flags
);
1079 this->relro_segment_
->add_output_section(os
, seg_flags
, false);
1083 // Make an output section for a script.
1086 Layout::make_output_section_for_script(const char* name
)
1088 name
= this->namepool_
.add(name
, false, NULL
);
1089 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_PROGBITS
,
1090 elfcpp::SHF_ALLOC
, false,
1092 os
->set_found_in_sections_clause();
1096 // Return the number of segments we expect to see.
1099 Layout::expected_segment_count() const
1101 size_t ret
= this->segment_list_
.size();
1103 // If we didn't see a SECTIONS clause in a linker script, we should
1104 // already have the complete list of segments. Otherwise we ask the
1105 // SECTIONS clause how many segments it expects, and add in the ones
1106 // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.)
1108 if (!this->script_options_
->saw_sections_clause())
1112 const Script_sections
* ss
= this->script_options_
->script_sections();
1113 return ret
+ ss
->expected_segment_count(this);
1117 // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK
1118 // is whether we saw a .note.GNU-stack section in the object file.
1119 // GNU_STACK_FLAGS is the section flags. The flags give the
1120 // protection required for stack memory. We record this in an
1121 // executable as a PT_GNU_STACK segment. If an object file does not
1122 // have a .note.GNU-stack segment, we must assume that it is an old
1123 // object. On some targets that will force an executable stack.
1126 Layout::layout_gnu_stack(bool seen_gnu_stack
, uint64_t gnu_stack_flags
)
1128 if (!seen_gnu_stack
)
1129 this->input_without_gnu_stack_note_
= true;
1132 this->input_with_gnu_stack_note_
= true;
1133 if ((gnu_stack_flags
& elfcpp::SHF_EXECINSTR
) != 0)
1134 this->input_requires_executable_stack_
= true;
1138 // Create automatic note sections.
1141 Layout::create_notes()
1143 this->create_gold_note();
1144 this->create_executable_stack_info();
1145 this->create_build_id();
1148 // Create the dynamic sections which are needed before we read the
1152 Layout::create_initial_dynamic_sections(Symbol_table
* symtab
)
1154 if (parameters
->doing_static_link())
1157 this->dynamic_section_
= this->choose_output_section(NULL
, ".dynamic",
1158 elfcpp::SHT_DYNAMIC
,
1160 | elfcpp::SHF_WRITE
),
1161 false, false, true);
1162 this->dynamic_section_
->set_is_relro();
1164 symtab
->define_in_output_data("_DYNAMIC", NULL
, this->dynamic_section_
, 0, 0,
1165 elfcpp::STT_OBJECT
, elfcpp::STB_LOCAL
,
1166 elfcpp::STV_HIDDEN
, 0, false, false);
1168 this->dynamic_data_
= new Output_data_dynamic(&this->dynpool_
);
1170 this->dynamic_section_
->add_output_section_data(this->dynamic_data_
);
1173 // For each output section whose name can be represented as C symbol,
1174 // define __start and __stop symbols for the section. This is a GNU
1178 Layout::define_section_symbols(Symbol_table
* symtab
)
1180 for (Section_list::const_iterator p
= this->section_list_
.begin();
1181 p
!= this->section_list_
.end();
1184 const char* const name
= (*p
)->name();
1185 if (name
[strspn(name
,
1187 "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
1188 "abcdefghijklmnopqrstuvwxyz"
1192 const std::string
name_string(name
);
1193 const std::string
start_name("__start_" + name_string
);
1194 const std::string
stop_name("__stop_" + name_string
);
1196 symtab
->define_in_output_data(start_name
.c_str(),
1203 elfcpp::STV_DEFAULT
,
1205 false, // offset_is_from_end
1206 true); // only_if_ref
1208 symtab
->define_in_output_data(stop_name
.c_str(),
1215 elfcpp::STV_DEFAULT
,
1217 true, // offset_is_from_end
1218 true); // only_if_ref
1223 // Define symbols for group signatures.
1226 Layout::define_group_signatures(Symbol_table
* symtab
)
1228 for (Group_signatures::iterator p
= this->group_signatures_
.begin();
1229 p
!= this->group_signatures_
.end();
1232 Symbol
* sym
= symtab
->lookup(p
->signature
, NULL
);
1234 p
->section
->set_info_symndx(sym
);
1237 // Force the name of the group section to the group
1238 // signature, and use the group's section symbol as the
1239 // signature symbol.
1240 if (strcmp(p
->section
->name(), p
->signature
) != 0)
1242 const char* name
= this->namepool_
.add(p
->signature
,
1244 p
->section
->set_name(name
);
1246 p
->section
->set_needs_symtab_index();
1247 p
->section
->set_info_section_symndx(p
->section
);
1251 this->group_signatures_
.clear();
1254 // Find the first read-only PT_LOAD segment, creating one if
1258 Layout::find_first_load_seg()
1260 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
1261 p
!= this->segment_list_
.end();
1264 if ((*p
)->type() == elfcpp::PT_LOAD
1265 && ((*p
)->flags() & elfcpp::PF_R
) != 0
1266 && (parameters
->options().omagic()
1267 || ((*p
)->flags() & elfcpp::PF_W
) == 0))
1271 gold_assert(!this->script_options_
->saw_phdrs_clause());
1273 Output_segment
* load_seg
= this->make_output_segment(elfcpp::PT_LOAD
,
1278 // Save states of all current output segments. Store saved states
1279 // in SEGMENT_STATES.
1282 Layout::save_segments(Segment_states
* segment_states
)
1284 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
1285 p
!= this->segment_list_
.end();
1288 Output_segment
* segment
= *p
;
1290 Output_segment
* copy
= new Output_segment(*segment
);
1291 (*segment_states
)[segment
] = copy
;
1295 // Restore states of output segments and delete any segment not found in
1299 Layout::restore_segments(const Segment_states
* segment_states
)
1301 // Go through the segment list and remove any segment added in the
1303 this->tls_segment_
= NULL
;
1304 this->relro_segment_
= NULL
;
1305 Segment_list::iterator list_iter
= this->segment_list_
.begin();
1306 while (list_iter
!= this->segment_list_
.end())
1308 Output_segment
* segment
= *list_iter
;
1309 Segment_states::const_iterator states_iter
=
1310 segment_states
->find(segment
);
1311 if (states_iter
!= segment_states
->end())
1313 const Output_segment
* copy
= states_iter
->second
;
1314 // Shallow copy to restore states.
1317 // Also fix up TLS and RELRO segment pointers as appropriate.
1318 if (segment
->type() == elfcpp::PT_TLS
)
1319 this->tls_segment_
= segment
;
1320 else if (segment
->type() == elfcpp::PT_GNU_RELRO
)
1321 this->relro_segment_
= segment
;
1327 list_iter
= this->segment_list_
.erase(list_iter
);
1328 // This is a segment created during section layout. It should be
1329 // safe to remove it since we should have removed all pointers to it.
1335 // Clean up after relaxation so that sections can be laid out again.
1338 Layout::clean_up_after_relaxation()
1340 // Restore the segments to point state just prior to the relaxation loop.
1341 Script_sections
* script_section
= this->script_options_
->script_sections();
1342 script_section
->release_segments();
1343 this->restore_segments(this->segment_states_
);
1345 // Reset section addresses and file offsets
1346 for (Section_list::iterator p
= this->section_list_
.begin();
1347 p
!= this->section_list_
.end();
1350 (*p
)->reset_address_and_file_offset();
1351 (*p
)->restore_states();
1354 // Reset special output object address and file offsets.
1355 for (Data_list::iterator p
= this->special_output_list_
.begin();
1356 p
!= this->special_output_list_
.end();
1358 (*p
)->reset_address_and_file_offset();
1360 // A linker script may have created some output section data objects.
1361 // They are useless now.
1362 for (Output_section_data_list::const_iterator p
=
1363 this->script_output_section_data_list_
.begin();
1364 p
!= this->script_output_section_data_list_
.end();
1367 this->script_output_section_data_list_
.clear();
1370 // Prepare for relaxation.
1373 Layout::prepare_for_relaxation()
1375 // Create an relaxation debug check if in debugging mode.
1376 if (is_debugging_enabled(DEBUG_RELAXATION
))
1377 this->relaxation_debug_check_
= new Relaxation_debug_check();
1379 // Save segment states.
1380 this->segment_states_
= new Segment_states();
1381 this->save_segments(this->segment_states_
);
1383 for(Section_list::const_iterator p
= this->section_list_
.begin();
1384 p
!= this->section_list_
.end();
1386 (*p
)->save_states();
1388 if (is_debugging_enabled(DEBUG_RELAXATION
))
1389 this->relaxation_debug_check_
->check_output_data_for_reset_values(
1390 this->section_list_
, this->special_output_list_
);
1392 // Also enable recording of output section data from scripts.
1393 this->record_output_section_data_from_script_
= true;
1396 // Relaxation loop body: If target has no relaxation, this runs only once
1397 // Otherwise, the target relaxation hook is called at the end of
1398 // each iteration. If the hook returns true, it means re-layout of
1399 // section is required.
1401 // The number of segments created by a linking script without a PHDRS
1402 // clause may be affected by section sizes and alignments. There is
1403 // a remote chance that relaxation causes different number of PT_LOAD
1404 // segments are created and sections are attached to different segments.
1405 // Therefore, we always throw away all segments created during section
1406 // layout. In order to be able to restart the section layout, we keep
1407 // a copy of the segment list right before the relaxation loop and use
1408 // that to restore the segments.
1410 // PASS is the current relaxation pass number.
1411 // SYMTAB is a symbol table.
1412 // PLOAD_SEG is the address of a pointer for the load segment.
1413 // PHDR_SEG is a pointer to the PHDR segment.
1414 // SEGMENT_HEADERS points to the output segment header.
1415 // FILE_HEADER points to the output file header.
1416 // PSHNDX is the address to store the output section index.
1419 Layout::relaxation_loop_body(
1422 Symbol_table
* symtab
,
1423 Output_segment
** pload_seg
,
1424 Output_segment
* phdr_seg
,
1425 Output_segment_headers
* segment_headers
,
1426 Output_file_header
* file_header
,
1427 unsigned int* pshndx
)
1429 // If this is not the first iteration, we need to clean up after
1430 // relaxation so that we can lay out the sections again.
1432 this->clean_up_after_relaxation();
1434 // If there is a SECTIONS clause, put all the input sections into
1435 // the required order.
1436 Output_segment
* load_seg
;
1437 if (this->script_options_
->saw_sections_clause())
1438 load_seg
= this->set_section_addresses_from_script(symtab
);
1439 else if (parameters
->options().relocatable())
1442 load_seg
= this->find_first_load_seg();
1444 if (parameters
->options().oformat_enum()
1445 != General_options::OBJECT_FORMAT_ELF
)
1448 gold_assert(phdr_seg
== NULL
1450 || this->script_options_
->saw_sections_clause());
1452 // Lay out the segment headers.
1453 if (!parameters
->options().relocatable())
1455 gold_assert(segment_headers
!= NULL
);
1456 if (load_seg
!= NULL
)
1457 load_seg
->add_initial_output_data(segment_headers
);
1458 if (phdr_seg
!= NULL
)
1459 phdr_seg
->add_initial_output_data(segment_headers
);
1462 // Lay out the file header.
1463 if (load_seg
!= NULL
)
1464 load_seg
->add_initial_output_data(file_header
);
1466 if (this->script_options_
->saw_phdrs_clause()
1467 && !parameters
->options().relocatable())
1469 // Support use of FILEHDRS and PHDRS attachments in a PHDRS
1470 // clause in a linker script.
1471 Script_sections
* ss
= this->script_options_
->script_sections();
1472 ss
->put_headers_in_phdrs(file_header
, segment_headers
);
1475 // We set the output section indexes in set_segment_offsets and
1476 // set_section_indexes.
1479 // Set the file offsets of all the segments, and all the sections
1482 if (!parameters
->options().relocatable())
1483 off
= this->set_segment_offsets(target
, load_seg
, pshndx
);
1485 off
= this->set_relocatable_section_offsets(file_header
, pshndx
);
1487 // Verify that the dummy relaxation does not change anything.
1488 if (is_debugging_enabled(DEBUG_RELAXATION
))
1491 this->relaxation_debug_check_
->read_sections(this->section_list_
);
1493 this->relaxation_debug_check_
->verify_sections(this->section_list_
);
1496 *pload_seg
= load_seg
;
1500 // Finalize the layout. When this is called, we have created all the
1501 // output sections and all the output segments which are based on
1502 // input sections. We have several things to do, and we have to do
1503 // them in the right order, so that we get the right results correctly
1506 // 1) Finalize the list of output segments and create the segment
1509 // 2) Finalize the dynamic symbol table and associated sections.
1511 // 3) Determine the final file offset of all the output segments.
1513 // 4) Determine the final file offset of all the SHF_ALLOC output
1516 // 5) Create the symbol table sections and the section name table
1519 // 6) Finalize the symbol table: set symbol values to their final
1520 // value and make a final determination of which symbols are going
1521 // into the output symbol table.
1523 // 7) Create the section table header.
1525 // 8) Determine the final file offset of all the output sections which
1526 // are not SHF_ALLOC, including the section table header.
1528 // 9) Finalize the ELF file header.
1530 // This function returns the size of the output file.
1533 Layout::finalize(const Input_objects
* input_objects
, Symbol_table
* symtab
,
1534 Target
* target
, const Task
* task
)
1536 target
->finalize_sections(this, input_objects
, symtab
);
1538 this->count_local_symbols(task
, input_objects
);
1540 this->link_stabs_sections();
1542 Output_segment
* phdr_seg
= NULL
;
1543 if (!parameters
->options().relocatable() && !parameters
->doing_static_link())
1545 // There was a dynamic object in the link. We need to create
1546 // some information for the dynamic linker.
1548 // Create the PT_PHDR segment which will hold the program
1550 if (!this->script_options_
->saw_phdrs_clause())
1551 phdr_seg
= this->make_output_segment(elfcpp::PT_PHDR
, elfcpp::PF_R
);
1553 // Create the dynamic symbol table, including the hash table.
1554 Output_section
* dynstr
;
1555 std::vector
<Symbol
*> dynamic_symbols
;
1556 unsigned int local_dynamic_count
;
1557 Versions
versions(*this->script_options()->version_script_info(),
1559 this->create_dynamic_symtab(input_objects
, symtab
, &dynstr
,
1560 &local_dynamic_count
, &dynamic_symbols
,
1563 // Create the .interp section to hold the name of the
1564 // interpreter, and put it in a PT_INTERP segment.
1565 if (!parameters
->options().shared())
1566 this->create_interp(target
);
1568 // Finish the .dynamic section to hold the dynamic data, and put
1569 // it in a PT_DYNAMIC segment.
1570 this->finish_dynamic_section(input_objects
, symtab
);
1572 // We should have added everything we need to the dynamic string
1574 this->dynpool_
.set_string_offsets();
1576 // Create the version sections. We can't do this until the
1577 // dynamic string table is complete.
1578 this->create_version_sections(&versions
, symtab
, local_dynamic_count
,
1579 dynamic_symbols
, dynstr
);
1582 if (this->incremental_inputs_
)
1584 this->incremental_inputs_
->finalize();
1585 this->create_incremental_info_sections();
1588 // Create segment headers.
1589 Output_segment_headers
* segment_headers
=
1590 (parameters
->options().relocatable()
1592 : new Output_segment_headers(this->segment_list_
));
1594 // Lay out the file header.
1595 Output_file_header
* file_header
1596 = new Output_file_header(target
, symtab
, segment_headers
,
1597 parameters
->options().entry());
1599 this->special_output_list_
.push_back(file_header
);
1600 if (segment_headers
!= NULL
)
1601 this->special_output_list_
.push_back(segment_headers
);
1603 // Find approriate places for orphan output sections if we are using
1605 if (this->script_options_
->saw_sections_clause())
1606 this->place_orphan_sections_in_script();
1608 Output_segment
* load_seg
;
1613 // Take a snapshot of the section layout as needed.
1614 if (target
->may_relax())
1615 this->prepare_for_relaxation();
1617 // Run the relaxation loop to lay out sections.
1620 off
= this->relaxation_loop_body(pass
, target
, symtab
, &load_seg
,
1621 phdr_seg
, segment_headers
, file_header
,
1625 while (target
->may_relax()
1626 && target
->relax(pass
, input_objects
, symtab
, this));
1628 // Set the file offsets of all the non-data sections we've seen so
1629 // far which don't have to wait for the input sections. We need
1630 // this in order to finalize local symbols in non-allocated
1632 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
1634 // Set the section indexes of all unallocated sections seen so far,
1635 // in case any of them are somehow referenced by a symbol.
1636 shndx
= this->set_section_indexes(shndx
);
1638 // Create the symbol table sections.
1639 this->create_symtab_sections(input_objects
, symtab
, shndx
, &off
);
1640 if (!parameters
->doing_static_link())
1641 this->assign_local_dynsym_offsets(input_objects
);
1643 // Process any symbol assignments from a linker script. This must
1644 // be called after the symbol table has been finalized.
1645 this->script_options_
->finalize_symbols(symtab
, this);
1647 // Create the .shstrtab section.
1648 Output_section
* shstrtab_section
= this->create_shstrtab();
1650 // Set the file offsets of the rest of the non-data sections which
1651 // don't have to wait for the input sections.
1652 off
= this->set_section_offsets(off
, BEFORE_INPUT_SECTIONS_PASS
);
1654 // Now that all sections have been created, set the section indexes
1655 // for any sections which haven't been done yet.
1656 shndx
= this->set_section_indexes(shndx
);
1658 // Create the section table header.
1659 this->create_shdrs(shstrtab_section
, &off
);
1661 // If there are no sections which require postprocessing, we can
1662 // handle the section names now, and avoid a resize later.
1663 if (!this->any_postprocessing_sections_
)
1664 off
= this->set_section_offsets(off
,
1665 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
1667 file_header
->set_section_info(this->section_headers_
, shstrtab_section
);
1669 // Now we know exactly where everything goes in the output file
1670 // (except for non-allocated sections which require postprocessing).
1671 Output_data::layout_complete();
1673 this->output_file_size_
= off
;
1678 // Create a note header following the format defined in the ELF ABI.
1679 // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name
1680 // of the section to create, DESCSZ is the size of the descriptor.
1681 // ALLOCATE is true if the section should be allocated in memory.
1682 // This returns the new note section. It sets *TRAILING_PADDING to
1683 // the number of trailing zero bytes required.
1686 Layout::create_note(const char* name
, int note_type
,
1687 const char* section_name
, size_t descsz
,
1688 bool allocate
, size_t* trailing_padding
)
1690 // Authorities all agree that the values in a .note field should
1691 // be aligned on 4-byte boundaries for 32-bit binaries. However,
1692 // they differ on what the alignment is for 64-bit binaries.
1693 // The GABI says unambiguously they take 8-byte alignment:
1694 // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section
1695 // Other documentation says alignment should always be 4 bytes:
1696 // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format
1697 // GNU ld and GNU readelf both support the latter (at least as of
1698 // version 2.16.91), and glibc always generates the latter for
1699 // .note.ABI-tag (as of version 1.6), so that's the one we go with
1701 #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default.
1702 const int size
= parameters
->target().get_size();
1704 const int size
= 32;
1707 // The contents of the .note section.
1708 size_t namesz
= strlen(name
) + 1;
1709 size_t aligned_namesz
= align_address(namesz
, size
/ 8);
1710 size_t aligned_descsz
= align_address(descsz
, size
/ 8);
1712 size_t notehdrsz
= 3 * (size
/ 8) + aligned_namesz
;
1714 unsigned char* buffer
= new unsigned char[notehdrsz
];
1715 memset(buffer
, 0, notehdrsz
);
1717 bool is_big_endian
= parameters
->target().is_big_endian();
1723 elfcpp::Swap
<32, false>::writeval(buffer
, namesz
);
1724 elfcpp::Swap
<32, false>::writeval(buffer
+ 4, descsz
);
1725 elfcpp::Swap
<32, false>::writeval(buffer
+ 8, note_type
);
1729 elfcpp::Swap
<32, true>::writeval(buffer
, namesz
);
1730 elfcpp::Swap
<32, true>::writeval(buffer
+ 4, descsz
);
1731 elfcpp::Swap
<32, true>::writeval(buffer
+ 8, note_type
);
1734 else if (size
== 64)
1738 elfcpp::Swap
<64, false>::writeval(buffer
, namesz
);
1739 elfcpp::Swap
<64, false>::writeval(buffer
+ 8, descsz
);
1740 elfcpp::Swap
<64, false>::writeval(buffer
+ 16, note_type
);
1744 elfcpp::Swap
<64, true>::writeval(buffer
, namesz
);
1745 elfcpp::Swap
<64, true>::writeval(buffer
+ 8, descsz
);
1746 elfcpp::Swap
<64, true>::writeval(buffer
+ 16, note_type
);
1752 memcpy(buffer
+ 3 * (size
/ 8), name
, namesz
);
1754 elfcpp::Elf_Xword flags
= 0;
1756 flags
= elfcpp::SHF_ALLOC
;
1757 Output_section
* os
= this->choose_output_section(NULL
, section_name
,
1759 flags
, false, false,
1764 Output_section_data
* posd
= new Output_data_const_buffer(buffer
, notehdrsz
,
1767 os
->add_output_section_data(posd
);
1769 *trailing_padding
= aligned_descsz
- descsz
;
1774 // For an executable or shared library, create a note to record the
1775 // version of gold used to create the binary.
1778 Layout::create_gold_note()
1780 if (parameters
->options().relocatable())
1783 std::string desc
= std::string("gold ") + gold::get_version_string();
1785 size_t trailing_padding
;
1786 Output_section
*os
= this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION
,
1787 ".note.gnu.gold-version", desc
.size(),
1788 false, &trailing_padding
);
1792 Output_section_data
* posd
= new Output_data_const(desc
, 4);
1793 os
->add_output_section_data(posd
);
1795 if (trailing_padding
> 0)
1797 posd
= new Output_data_zero_fill(trailing_padding
, 0);
1798 os
->add_output_section_data(posd
);
1802 // Record whether the stack should be executable. This can be set
1803 // from the command line using the -z execstack or -z noexecstack
1804 // options. Otherwise, if any input file has a .note.GNU-stack
1805 // section with the SHF_EXECINSTR flag set, the stack should be
1806 // executable. Otherwise, if at least one input file a
1807 // .note.GNU-stack section, and some input file has no .note.GNU-stack
1808 // section, we use the target default for whether the stack should be
1809 // executable. Otherwise, we don't generate a stack note. When
1810 // generating a object file, we create a .note.GNU-stack section with
1811 // the appropriate marking. When generating an executable or shared
1812 // library, we create a PT_GNU_STACK segment.
1815 Layout::create_executable_stack_info()
1817 bool is_stack_executable
;
1818 if (parameters
->options().is_execstack_set())
1819 is_stack_executable
= parameters
->options().is_stack_executable();
1820 else if (!this->input_with_gnu_stack_note_
)
1824 if (this->input_requires_executable_stack_
)
1825 is_stack_executable
= true;
1826 else if (this->input_without_gnu_stack_note_
)
1827 is_stack_executable
=
1828 parameters
->target().is_default_stack_executable();
1830 is_stack_executable
= false;
1833 if (parameters
->options().relocatable())
1835 const char* name
= this->namepool_
.add(".note.GNU-stack", false, NULL
);
1836 elfcpp::Elf_Xword flags
= 0;
1837 if (is_stack_executable
)
1838 flags
|= elfcpp::SHF_EXECINSTR
;
1839 this->make_output_section(name
, elfcpp::SHT_PROGBITS
, flags
, false,
1844 if (this->script_options_
->saw_phdrs_clause())
1846 int flags
= elfcpp::PF_R
| elfcpp::PF_W
;
1847 if (is_stack_executable
)
1848 flags
|= elfcpp::PF_X
;
1849 this->make_output_segment(elfcpp::PT_GNU_STACK
, flags
);
1853 // If --build-id was used, set up the build ID note.
1856 Layout::create_build_id()
1858 if (!parameters
->options().user_set_build_id())
1861 const char* style
= parameters
->options().build_id();
1862 if (strcmp(style
, "none") == 0)
1865 // Set DESCSZ to the size of the note descriptor. When possible,
1866 // set DESC to the note descriptor contents.
1869 if (strcmp(style
, "md5") == 0)
1871 else if (strcmp(style
, "sha1") == 0)
1873 else if (strcmp(style
, "uuid") == 0)
1875 const size_t uuidsz
= 128 / 8;
1877 char buffer
[uuidsz
];
1878 memset(buffer
, 0, uuidsz
);
1880 int descriptor
= open_descriptor(-1, "/dev/urandom", O_RDONLY
);
1882 gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"),
1886 ssize_t got
= ::read(descriptor
, buffer
, uuidsz
);
1887 release_descriptor(descriptor
, true);
1889 gold_error(_("/dev/urandom: read failed: %s"), strerror(errno
));
1890 else if (static_cast<size_t>(got
) != uuidsz
)
1891 gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"),
1895 desc
.assign(buffer
, uuidsz
);
1898 else if (strncmp(style
, "0x", 2) == 0)
1901 const char* p
= style
+ 2;
1904 if (hex_p(p
[0]) && hex_p(p
[1]))
1906 char c
= (hex_value(p
[0]) << 4) | hex_value(p
[1]);
1910 else if (*p
== '-' || *p
== ':')
1913 gold_fatal(_("--build-id argument '%s' not a valid hex number"),
1916 descsz
= desc
.size();
1919 gold_fatal(_("unrecognized --build-id argument '%s'"), style
);
1922 size_t trailing_padding
;
1923 Output_section
* os
= this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID
,
1924 ".note.gnu.build-id", descsz
, true,
1931 // We know the value already, so we fill it in now.
1932 gold_assert(desc
.size() == descsz
);
1934 Output_section_data
* posd
= new Output_data_const(desc
, 4);
1935 os
->add_output_section_data(posd
);
1937 if (trailing_padding
!= 0)
1939 posd
= new Output_data_zero_fill(trailing_padding
, 0);
1940 os
->add_output_section_data(posd
);
1945 // We need to compute a checksum after we have completed the
1947 gold_assert(trailing_padding
== 0);
1948 this->build_id_note_
= new Output_data_zero_fill(descsz
, 4);
1949 os
->add_output_section_data(this->build_id_note_
);
1953 // If we have both .stabXX and .stabXXstr sections, then the sh_link
1954 // field of the former should point to the latter. I'm not sure who
1955 // started this, but the GNU linker does it, and some tools depend
1959 Layout::link_stabs_sections()
1961 if (!this->have_stabstr_section_
)
1964 for (Section_list::iterator p
= this->section_list_
.begin();
1965 p
!= this->section_list_
.end();
1968 if ((*p
)->type() != elfcpp::SHT_STRTAB
)
1971 const char* name
= (*p
)->name();
1972 if (strncmp(name
, ".stab", 5) != 0)
1975 size_t len
= strlen(name
);
1976 if (strcmp(name
+ len
- 3, "str") != 0)
1979 std::string
stab_name(name
, len
- 3);
1980 Output_section
* stab_sec
;
1981 stab_sec
= this->find_output_section(stab_name
.c_str());
1982 if (stab_sec
!= NULL
)
1983 stab_sec
->set_link_section(*p
);
1987 // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed
1988 // for the next run of incremental linking to check what has changed.
1991 Layout::create_incremental_info_sections()
1993 gold_assert(this->incremental_inputs_
!= NULL
);
1995 // Add the .gnu_incremental_inputs section.
1996 const char *incremental_inputs_name
=
1997 this->namepool_
.add(".gnu_incremental_inputs", false, NULL
);
1998 Output_section
* inputs_os
=
1999 this->make_output_section(incremental_inputs_name
,
2000 elfcpp::SHT_GNU_INCREMENTAL_INPUTS
, 0,
2002 Output_section_data
* posd
=
2003 this->incremental_inputs_
->create_incremental_inputs_section_data();
2004 inputs_os
->add_output_section_data(posd
);
2006 // Add the .gnu_incremental_strtab section.
2007 const char *incremental_strtab_name
=
2008 this->namepool_
.add(".gnu_incremental_strtab", false, NULL
);
2009 Output_section
* strtab_os
= this->make_output_section(incremental_strtab_name
,
2012 Output_data_strtab
* strtab_data
=
2013 new Output_data_strtab(this->incremental_inputs_
->get_stringpool());
2014 strtab_os
->add_output_section_data(strtab_data
);
2016 inputs_os
->set_link_section(strtab_data
);
2019 // Return whether SEG1 should be before SEG2 in the output file. This
2020 // is based entirely on the segment type and flags. When this is
2021 // called the segment addresses has normally not yet been set.
2024 Layout::segment_precedes(const Output_segment
* seg1
,
2025 const Output_segment
* seg2
)
2027 elfcpp::Elf_Word type1
= seg1
->type();
2028 elfcpp::Elf_Word type2
= seg2
->type();
2030 // The single PT_PHDR segment is required to precede any loadable
2031 // segment. We simply make it always first.
2032 if (type1
== elfcpp::PT_PHDR
)
2034 gold_assert(type2
!= elfcpp::PT_PHDR
);
2037 if (type2
== elfcpp::PT_PHDR
)
2040 // The single PT_INTERP segment is required to precede any loadable
2041 // segment. We simply make it always second.
2042 if (type1
== elfcpp::PT_INTERP
)
2044 gold_assert(type2
!= elfcpp::PT_INTERP
);
2047 if (type2
== elfcpp::PT_INTERP
)
2050 // We then put PT_LOAD segments before any other segments.
2051 if (type1
== elfcpp::PT_LOAD
&& type2
!= elfcpp::PT_LOAD
)
2053 if (type2
== elfcpp::PT_LOAD
&& type1
!= elfcpp::PT_LOAD
)
2056 // We put the PT_TLS segment last except for the PT_GNU_RELRO
2057 // segment, because that is where the dynamic linker expects to find
2058 // it (this is just for efficiency; other positions would also work
2060 if (type1
== elfcpp::PT_TLS
2061 && type2
!= elfcpp::PT_TLS
2062 && type2
!= elfcpp::PT_GNU_RELRO
)
2064 if (type2
== elfcpp::PT_TLS
2065 && type1
!= elfcpp::PT_TLS
2066 && type1
!= elfcpp::PT_GNU_RELRO
)
2069 // We put the PT_GNU_RELRO segment last, because that is where the
2070 // dynamic linker expects to find it (as with PT_TLS, this is just
2072 if (type1
== elfcpp::PT_GNU_RELRO
&& type2
!= elfcpp::PT_GNU_RELRO
)
2074 if (type2
== elfcpp::PT_GNU_RELRO
&& type1
!= elfcpp::PT_GNU_RELRO
)
2077 const elfcpp::Elf_Word flags1
= seg1
->flags();
2078 const elfcpp::Elf_Word flags2
= seg2
->flags();
2080 // The order of non-PT_LOAD segments is unimportant. We simply sort
2081 // by the numeric segment type and flags values. There should not
2082 // be more than one segment with the same type and flags.
2083 if (type1
!= elfcpp::PT_LOAD
)
2086 return type1
< type2
;
2087 gold_assert(flags1
!= flags2
);
2088 return flags1
< flags2
;
2091 // If the addresses are set already, sort by load address.
2092 if (seg1
->are_addresses_set())
2094 if (!seg2
->are_addresses_set())
2097 unsigned int section_count1
= seg1
->output_section_count();
2098 unsigned int section_count2
= seg2
->output_section_count();
2099 if (section_count1
== 0 && section_count2
> 0)
2101 if (section_count1
> 0 && section_count2
== 0)
2104 uint64_t paddr1
= seg1
->first_section_load_address();
2105 uint64_t paddr2
= seg2
->first_section_load_address();
2106 if (paddr1
!= paddr2
)
2107 return paddr1
< paddr2
;
2109 else if (seg2
->are_addresses_set())
2112 // A segment which holds large data comes after a segment which does
2113 // not hold large data.
2114 if (seg1
->is_large_data_segment())
2116 if (!seg2
->is_large_data_segment())
2119 else if (seg2
->is_large_data_segment())
2122 // Otherwise, we sort PT_LOAD segments based on the flags. Readonly
2123 // segments come before writable segments. Then writable segments
2124 // with data come before writable segments without data. Then
2125 // executable segments come before non-executable segments. Then
2126 // the unlikely case of a non-readable segment comes before the
2127 // normal case of a readable segment. If there are multiple
2128 // segments with the same type and flags, we require that the
2129 // address be set, and we sort by virtual address and then physical
2131 if ((flags1
& elfcpp::PF_W
) != (flags2
& elfcpp::PF_W
))
2132 return (flags1
& elfcpp::PF_W
) == 0;
2133 if ((flags1
& elfcpp::PF_W
) != 0
2134 && seg1
->has_any_data_sections() != seg2
->has_any_data_sections())
2135 return seg1
->has_any_data_sections();
2136 if ((flags1
& elfcpp::PF_X
) != (flags2
& elfcpp::PF_X
))
2137 return (flags1
& elfcpp::PF_X
) != 0;
2138 if ((flags1
& elfcpp::PF_R
) != (flags2
& elfcpp::PF_R
))
2139 return (flags1
& elfcpp::PF_R
) == 0;
2141 // We shouldn't get here--we shouldn't create segments which we
2142 // can't distinguish.
2146 // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE.
2149 align_file_offset(off_t off
, uint64_t addr
, uint64_t abi_pagesize
)
2151 uint64_t unsigned_off
= off
;
2152 uint64_t aligned_off
= ((unsigned_off
& ~(abi_pagesize
- 1))
2153 | (addr
& (abi_pagesize
- 1)));
2154 if (aligned_off
< unsigned_off
)
2155 aligned_off
+= abi_pagesize
;
2159 // Set the file offsets of all the segments, and all the sections they
2160 // contain. They have all been created. LOAD_SEG must be be laid out
2161 // first. Return the offset of the data to follow.
2164 Layout::set_segment_offsets(const Target
* target
, Output_segment
* load_seg
,
2165 unsigned int *pshndx
)
2167 // Sort them into the final order.
2168 std::sort(this->segment_list_
.begin(), this->segment_list_
.end(),
2169 Layout::Compare_segments());
2171 // Find the PT_LOAD segments, and set their addresses and offsets
2172 // and their section's addresses and offsets.
2174 if (parameters
->options().user_set_Ttext())
2175 addr
= parameters
->options().Ttext();
2176 else if (parameters
->options().output_is_position_independent())
2179 addr
= target
->default_text_segment_address();
2182 // If LOAD_SEG is NULL, then the file header and segment headers
2183 // will not be loadable. But they still need to be at offset 0 in
2184 // the file. Set their offsets now.
2185 if (load_seg
== NULL
)
2187 for (Data_list::iterator p
= this->special_output_list_
.begin();
2188 p
!= this->special_output_list_
.end();
2191 off
= align_address(off
, (*p
)->addralign());
2192 (*p
)->set_address_and_file_offset(0, off
);
2193 off
+= (*p
)->data_size();
2197 const bool check_sections
= parameters
->options().check_sections();
2198 Output_segment
* last_load_segment
= NULL
;
2200 bool was_readonly
= false;
2201 for (Segment_list::iterator p
= this->segment_list_
.begin();
2202 p
!= this->segment_list_
.end();
2205 if ((*p
)->type() == elfcpp::PT_LOAD
)
2207 if (load_seg
!= NULL
&& load_seg
!= *p
)
2211 bool are_addresses_set
= (*p
)->are_addresses_set();
2212 if (are_addresses_set
)
2214 // When it comes to setting file offsets, we care about
2215 // the physical address.
2216 addr
= (*p
)->paddr();
2218 else if (parameters
->options().user_set_Tdata()
2219 && ((*p
)->flags() & elfcpp::PF_W
) != 0
2220 && (!parameters
->options().user_set_Tbss()
2221 || (*p
)->has_any_data_sections()))
2223 addr
= parameters
->options().Tdata();
2224 are_addresses_set
= true;
2226 else if (parameters
->options().user_set_Tbss()
2227 && ((*p
)->flags() & elfcpp::PF_W
) != 0
2228 && !(*p
)->has_any_data_sections())
2230 addr
= parameters
->options().Tbss();
2231 are_addresses_set
= true;
2234 uint64_t orig_addr
= addr
;
2235 uint64_t orig_off
= off
;
2237 uint64_t aligned_addr
= 0;
2238 uint64_t abi_pagesize
= target
->abi_pagesize();
2239 uint64_t common_pagesize
= target
->common_pagesize();
2241 if (!parameters
->options().nmagic()
2242 && !parameters
->options().omagic())
2243 (*p
)->set_minimum_p_align(common_pagesize
);
2245 if (!are_addresses_set
)
2247 // If the last segment was readonly, and this one is
2248 // not, then skip the address forward one page,
2249 // maintaining the same position within the page. This
2250 // lets us store both segments overlapping on a single
2251 // page in the file, but the loader will put them on
2252 // different pages in memory.
2254 addr
= align_address(addr
, (*p
)->maximum_alignment());
2255 aligned_addr
= addr
;
2257 if (was_readonly
&& ((*p
)->flags() & elfcpp::PF_W
) != 0)
2259 if ((addr
& (abi_pagesize
- 1)) != 0)
2260 addr
= addr
+ abi_pagesize
;
2263 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
2266 if (!parameters
->options().nmagic()
2267 && !parameters
->options().omagic())
2268 off
= align_file_offset(off
, addr
, abi_pagesize
);
2269 else if (load_seg
== NULL
)
2271 // This is -N or -n with a section script which prevents
2272 // us from using a load segment. We need to ensure that
2273 // the file offset is aligned to the alignment of the
2274 // segment. This is because the linker script
2275 // implicitly assumed a zero offset. If we don't align
2276 // here, then the alignment of the sections in the
2277 // linker script may not match the alignment of the
2278 // sections in the set_section_addresses call below,
2279 // causing an error about dot moving backward.
2280 off
= align_address(off
, (*p
)->maximum_alignment());
2283 unsigned int shndx_hold
= *pshndx
;
2284 uint64_t new_addr
= (*p
)->set_section_addresses(this, false, addr
,
2287 // Now that we know the size of this segment, we may be able
2288 // to save a page in memory, at the cost of wasting some
2289 // file space, by instead aligning to the start of a new
2290 // page. Here we use the real machine page size rather than
2291 // the ABI mandated page size.
2293 if (!are_addresses_set
&& aligned_addr
!= addr
)
2295 uint64_t first_off
= (common_pagesize
2297 & (common_pagesize
- 1)));
2298 uint64_t last_off
= new_addr
& (common_pagesize
- 1);
2301 && ((aligned_addr
& ~ (common_pagesize
- 1))
2302 != (new_addr
& ~ (common_pagesize
- 1)))
2303 && first_off
+ last_off
<= common_pagesize
)
2305 *pshndx
= shndx_hold
;
2306 addr
= align_address(aligned_addr
, common_pagesize
);
2307 addr
= align_address(addr
, (*p
)->maximum_alignment());
2308 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
2309 off
= align_file_offset(off
, addr
, abi_pagesize
);
2310 new_addr
= (*p
)->set_section_addresses(this, true, addr
,
2317 if (((*p
)->flags() & elfcpp::PF_W
) == 0)
2318 was_readonly
= true;
2320 // Implement --check-sections. We know that the segments
2321 // are sorted by LMA.
2322 if (check_sections
&& last_load_segment
!= NULL
)
2324 gold_assert(last_load_segment
->paddr() <= (*p
)->paddr());
2325 if (last_load_segment
->paddr() + last_load_segment
->memsz()
2328 unsigned long long lb1
= last_load_segment
->paddr();
2329 unsigned long long le1
= lb1
+ last_load_segment
->memsz();
2330 unsigned long long lb2
= (*p
)->paddr();
2331 unsigned long long le2
= lb2
+ (*p
)->memsz();
2332 gold_error(_("load segment overlap [0x%llx -> 0x%llx] and "
2333 "[0x%llx -> 0x%llx]"),
2334 lb1
, le1
, lb2
, le2
);
2337 last_load_segment
= *p
;
2341 // Handle the non-PT_LOAD segments, setting their offsets from their
2342 // section's offsets.
2343 for (Segment_list::iterator p
= this->segment_list_
.begin();
2344 p
!= this->segment_list_
.end();
2347 if ((*p
)->type() != elfcpp::PT_LOAD
)
2351 // Set the TLS offsets for each section in the PT_TLS segment.
2352 if (this->tls_segment_
!= NULL
)
2353 this->tls_segment_
->set_tls_offsets();
2358 // Set the offsets of all the allocated sections when doing a
2359 // relocatable link. This does the same jobs as set_segment_offsets,
2360 // only for a relocatable link.
2363 Layout::set_relocatable_section_offsets(Output_data
* file_header
,
2364 unsigned int *pshndx
)
2368 file_header
->set_address_and_file_offset(0, 0);
2369 off
+= file_header
->data_size();
2371 for (Section_list::iterator p
= this->section_list_
.begin();
2372 p
!= this->section_list_
.end();
2375 // We skip unallocated sections here, except that group sections
2376 // have to come first.
2377 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) == 0
2378 && (*p
)->type() != elfcpp::SHT_GROUP
)
2381 off
= align_address(off
, (*p
)->addralign());
2383 // The linker script might have set the address.
2384 if (!(*p
)->is_address_valid())
2385 (*p
)->set_address(0);
2386 (*p
)->set_file_offset(off
);
2387 (*p
)->finalize_data_size();
2388 off
+= (*p
)->data_size();
2390 (*p
)->set_out_shndx(*pshndx
);
2397 // Set the file offset of all the sections not associated with a
2401 Layout::set_section_offsets(off_t off
, Layout::Section_offset_pass pass
)
2403 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
2404 p
!= this->unattached_section_list_
.end();
2407 // The symtab section is handled in create_symtab_sections.
2408 if (*p
== this->symtab_section_
)
2411 // If we've already set the data size, don't set it again.
2412 if ((*p
)->is_offset_valid() && (*p
)->is_data_size_valid())
2415 if (pass
== BEFORE_INPUT_SECTIONS_PASS
2416 && (*p
)->requires_postprocessing())
2418 (*p
)->create_postprocessing_buffer();
2419 this->any_postprocessing_sections_
= true;
2422 if (pass
== BEFORE_INPUT_SECTIONS_PASS
2423 && (*p
)->after_input_sections())
2425 else if (pass
== POSTPROCESSING_SECTIONS_PASS
2426 && (!(*p
)->after_input_sections()
2427 || (*p
)->type() == elfcpp::SHT_STRTAB
))
2429 else if (pass
== STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
2430 && (!(*p
)->after_input_sections()
2431 || (*p
)->type() != elfcpp::SHT_STRTAB
))
2434 off
= align_address(off
, (*p
)->addralign());
2435 (*p
)->set_file_offset(off
);
2436 (*p
)->finalize_data_size();
2437 off
+= (*p
)->data_size();
2439 // At this point the name must be set.
2440 if (pass
!= STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
)
2441 this->namepool_
.add((*p
)->name(), false, NULL
);
2446 // Set the section indexes of all the sections not associated with a
2450 Layout::set_section_indexes(unsigned int shndx
)
2452 for (Section_list::iterator p
= this->unattached_section_list_
.begin();
2453 p
!= this->unattached_section_list_
.end();
2456 if (!(*p
)->has_out_shndx())
2458 (*p
)->set_out_shndx(shndx
);
2465 // Set the section addresses according to the linker script. This is
2466 // only called when we see a SECTIONS clause. This returns the
2467 // program segment which should hold the file header and segment
2468 // headers, if any. It will return NULL if they should not be in a
2472 Layout::set_section_addresses_from_script(Symbol_table
* symtab
)
2474 Script_sections
* ss
= this->script_options_
->script_sections();
2475 gold_assert(ss
->saw_sections_clause());
2476 return this->script_options_
->set_section_addresses(symtab
, this);
2479 // Place the orphan sections in the linker script.
2482 Layout::place_orphan_sections_in_script()
2484 Script_sections
* ss
= this->script_options_
->script_sections();
2485 gold_assert(ss
->saw_sections_clause());
2487 // Place each orphaned output section in the script.
2488 for (Section_list::iterator p
= this->section_list_
.begin();
2489 p
!= this->section_list_
.end();
2492 if (!(*p
)->found_in_sections_clause())
2493 ss
->place_orphan(*p
);
2497 // Count the local symbols in the regular symbol table and the dynamic
2498 // symbol table, and build the respective string pools.
2501 Layout::count_local_symbols(const Task
* task
,
2502 const Input_objects
* input_objects
)
2504 // First, figure out an upper bound on the number of symbols we'll
2505 // be inserting into each pool. This helps us create the pools with
2506 // the right size, to avoid unnecessary hashtable resizing.
2507 unsigned int symbol_count
= 0;
2508 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2509 p
!= input_objects
->relobj_end();
2511 symbol_count
+= (*p
)->local_symbol_count();
2513 // Go from "upper bound" to "estimate." We overcount for two
2514 // reasons: we double-count symbols that occur in more than one
2515 // object file, and we count symbols that are dropped from the
2516 // output. Add it all together and assume we overcount by 100%.
2519 // We assume all symbols will go into both the sympool and dynpool.
2520 this->sympool_
.reserve(symbol_count
);
2521 this->dynpool_
.reserve(symbol_count
);
2523 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2524 p
!= input_objects
->relobj_end();
2527 Task_lock_obj
<Object
> tlo(task
, *p
);
2528 (*p
)->count_local_symbols(&this->sympool_
, &this->dynpool_
);
2532 // Create the symbol table sections. Here we also set the final
2533 // values of the symbols. At this point all the loadable sections are
2534 // fully laid out. SHNUM is the number of sections so far.
2537 Layout::create_symtab_sections(const Input_objects
* input_objects
,
2538 Symbol_table
* symtab
,
2544 if (parameters
->target().get_size() == 32)
2546 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
2549 else if (parameters
->target().get_size() == 64)
2551 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
2558 off
= align_address(off
, align
);
2559 off_t startoff
= off
;
2561 // Save space for the dummy symbol at the start of the section. We
2562 // never bother to write this out--it will just be left as zero.
2564 unsigned int local_symbol_index
= 1;
2566 // Add STT_SECTION symbols for each Output section which needs one.
2567 for (Section_list::iterator p
= this->section_list_
.begin();
2568 p
!= this->section_list_
.end();
2571 if (!(*p
)->needs_symtab_index())
2572 (*p
)->set_symtab_index(-1U);
2575 (*p
)->set_symtab_index(local_symbol_index
);
2576 ++local_symbol_index
;
2581 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2582 p
!= input_objects
->relobj_end();
2585 unsigned int index
= (*p
)->finalize_local_symbols(local_symbol_index
,
2587 off
+= (index
- local_symbol_index
) * symsize
;
2588 local_symbol_index
= index
;
2591 unsigned int local_symcount
= local_symbol_index
;
2592 gold_assert(static_cast<off_t
>(local_symcount
* symsize
) == off
- startoff
);
2595 size_t dyn_global_index
;
2597 if (this->dynsym_section_
== NULL
)
2600 dyn_global_index
= 0;
2605 dyn_global_index
= this->dynsym_section_
->info();
2606 off_t locsize
= dyn_global_index
* this->dynsym_section_
->entsize();
2607 dynoff
= this->dynsym_section_
->offset() + locsize
;
2608 dyncount
= (this->dynsym_section_
->data_size() - locsize
) / symsize
;
2609 gold_assert(static_cast<off_t
>(dyncount
* symsize
)
2610 == this->dynsym_section_
->data_size() - locsize
);
2613 off
= symtab
->finalize(off
, dynoff
, dyn_global_index
, dyncount
,
2614 &this->sympool_
, &local_symcount
);
2616 if (!parameters
->options().strip_all())
2618 this->sympool_
.set_string_offsets();
2620 const char* symtab_name
= this->namepool_
.add(".symtab", false, NULL
);
2621 Output_section
* osymtab
= this->make_output_section(symtab_name
,
2624 this->symtab_section_
= osymtab
;
2626 Output_section_data
* pos
= new Output_data_fixed_space(off
- startoff
,
2629 osymtab
->add_output_section_data(pos
);
2631 // We generate a .symtab_shndx section if we have more than
2632 // SHN_LORESERVE sections. Technically it is possible that we
2633 // don't need one, because it is possible that there are no
2634 // symbols in any of sections with indexes larger than
2635 // SHN_LORESERVE. That is probably unusual, though, and it is
2636 // easier to always create one than to compute section indexes
2637 // twice (once here, once when writing out the symbols).
2638 if (shnum
>= elfcpp::SHN_LORESERVE
)
2640 const char* symtab_xindex_name
= this->namepool_
.add(".symtab_shndx",
2642 Output_section
* osymtab_xindex
=
2643 this->make_output_section(symtab_xindex_name
,
2644 elfcpp::SHT_SYMTAB_SHNDX
, 0, false,
2647 size_t symcount
= (off
- startoff
) / symsize
;
2648 this->symtab_xindex_
= new Output_symtab_xindex(symcount
);
2650 osymtab_xindex
->add_output_section_data(this->symtab_xindex_
);
2652 osymtab_xindex
->set_link_section(osymtab
);
2653 osymtab_xindex
->set_addralign(4);
2654 osymtab_xindex
->set_entsize(4);
2656 osymtab_xindex
->set_after_input_sections();
2658 // This tells the driver code to wait until the symbol table
2659 // has written out before writing out the postprocessing
2660 // sections, including the .symtab_shndx section.
2661 this->any_postprocessing_sections_
= true;
2664 const char* strtab_name
= this->namepool_
.add(".strtab", false, NULL
);
2665 Output_section
* ostrtab
= this->make_output_section(strtab_name
,
2669 Output_section_data
* pstr
= new Output_data_strtab(&this->sympool_
);
2670 ostrtab
->add_output_section_data(pstr
);
2672 osymtab
->set_file_offset(startoff
);
2673 osymtab
->finalize_data_size();
2674 osymtab
->set_link_section(ostrtab
);
2675 osymtab
->set_info(local_symcount
);
2676 osymtab
->set_entsize(symsize
);
2682 // Create the .shstrtab section, which holds the names of the
2683 // sections. At the time this is called, we have created all the
2684 // output sections except .shstrtab itself.
2687 Layout::create_shstrtab()
2689 // FIXME: We don't need to create a .shstrtab section if we are
2690 // stripping everything.
2692 const char* name
= this->namepool_
.add(".shstrtab", false, NULL
);
2694 Output_section
* os
= this->make_output_section(name
, elfcpp::SHT_STRTAB
, 0,
2697 if (strcmp(parameters
->options().compress_debug_sections(), "none") != 0)
2699 // We can't write out this section until we've set all the
2700 // section names, and we don't set the names of compressed
2701 // output sections until relocations are complete. FIXME: With
2702 // the current names we use, this is unnecessary.
2703 os
->set_after_input_sections();
2706 Output_section_data
* posd
= new Output_data_strtab(&this->namepool_
);
2707 os
->add_output_section_data(posd
);
2712 // Create the section headers. SIZE is 32 or 64. OFF is the file
2716 Layout::create_shdrs(const Output_section
* shstrtab_section
, off_t
* poff
)
2718 Output_section_headers
* oshdrs
;
2719 oshdrs
= new Output_section_headers(this,
2720 &this->segment_list_
,
2721 &this->section_list_
,
2722 &this->unattached_section_list_
,
2725 off_t off
= align_address(*poff
, oshdrs
->addralign());
2726 oshdrs
->set_address_and_file_offset(0, off
);
2727 off
+= oshdrs
->data_size();
2729 this->section_headers_
= oshdrs
;
2732 // Count the allocated sections.
2735 Layout::allocated_output_section_count() const
2737 size_t section_count
= 0;
2738 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
2739 p
!= this->segment_list_
.end();
2741 section_count
+= (*p
)->output_section_count();
2742 return section_count
;
2745 // Create the dynamic symbol table.
2748 Layout::create_dynamic_symtab(const Input_objects
* input_objects
,
2749 Symbol_table
* symtab
,
2750 Output_section
**pdynstr
,
2751 unsigned int* plocal_dynamic_count
,
2752 std::vector
<Symbol
*>* pdynamic_symbols
,
2753 Versions
* pversions
)
2755 // Count all the symbols in the dynamic symbol table, and set the
2756 // dynamic symbol indexes.
2758 // Skip symbol 0, which is always all zeroes.
2759 unsigned int index
= 1;
2761 // Add STT_SECTION symbols for each Output section which needs one.
2762 for (Section_list::iterator p
= this->section_list_
.begin();
2763 p
!= this->section_list_
.end();
2766 if (!(*p
)->needs_dynsym_index())
2767 (*p
)->set_dynsym_index(-1U);
2770 (*p
)->set_dynsym_index(index
);
2775 // Count the local symbols that need to go in the dynamic symbol table,
2776 // and set the dynamic symbol indexes.
2777 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2778 p
!= input_objects
->relobj_end();
2781 unsigned int new_index
= (*p
)->set_local_dynsym_indexes(index
);
2785 unsigned int local_symcount
= index
;
2786 *plocal_dynamic_count
= local_symcount
;
2788 index
= symtab
->set_dynsym_indexes(index
, pdynamic_symbols
,
2789 &this->dynpool_
, pversions
);
2793 const int size
= parameters
->target().get_size();
2796 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
2799 else if (size
== 64)
2801 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
2807 // Create the dynamic symbol table section.
2809 Output_section
* dynsym
= this->choose_output_section(NULL
, ".dynsym",
2812 false, false, true);
2814 Output_section_data
* odata
= new Output_data_fixed_space(index
* symsize
,
2817 dynsym
->add_output_section_data(odata
);
2819 dynsym
->set_info(local_symcount
);
2820 dynsym
->set_entsize(symsize
);
2821 dynsym
->set_addralign(align
);
2823 this->dynsym_section_
= dynsym
;
2825 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
2826 odyn
->add_section_address(elfcpp::DT_SYMTAB
, dynsym
);
2827 odyn
->add_constant(elfcpp::DT_SYMENT
, symsize
);
2829 // If there are more than SHN_LORESERVE allocated sections, we
2830 // create a .dynsym_shndx section. It is possible that we don't
2831 // need one, because it is possible that there are no dynamic
2832 // symbols in any of the sections with indexes larger than
2833 // SHN_LORESERVE. This is probably unusual, though, and at this
2834 // time we don't know the actual section indexes so it is
2835 // inconvenient to check.
2836 if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE
)
2838 Output_section
* dynsym_xindex
=
2839 this->choose_output_section(NULL
, ".dynsym_shndx",
2840 elfcpp::SHT_SYMTAB_SHNDX
,
2842 false, false, true);
2844 this->dynsym_xindex_
= new Output_symtab_xindex(index
);
2846 dynsym_xindex
->add_output_section_data(this->dynsym_xindex_
);
2848 dynsym_xindex
->set_link_section(dynsym
);
2849 dynsym_xindex
->set_addralign(4);
2850 dynsym_xindex
->set_entsize(4);
2852 dynsym_xindex
->set_after_input_sections();
2854 // This tells the driver code to wait until the symbol table has
2855 // written out before writing out the postprocessing sections,
2856 // including the .dynsym_shndx section.
2857 this->any_postprocessing_sections_
= true;
2860 // Create the dynamic string table section.
2862 Output_section
* dynstr
= this->choose_output_section(NULL
, ".dynstr",
2865 false, false, true);
2867 Output_section_data
* strdata
= new Output_data_strtab(&this->dynpool_
);
2868 dynstr
->add_output_section_data(strdata
);
2870 dynsym
->set_link_section(dynstr
);
2871 this->dynamic_section_
->set_link_section(dynstr
);
2873 odyn
->add_section_address(elfcpp::DT_STRTAB
, dynstr
);
2874 odyn
->add_section_size(elfcpp::DT_STRSZ
, dynstr
);
2878 // Create the hash tables.
2880 if (strcmp(parameters
->options().hash_style(), "sysv") == 0
2881 || strcmp(parameters
->options().hash_style(), "both") == 0)
2883 unsigned char* phash
;
2884 unsigned int hashlen
;
2885 Dynobj::create_elf_hash_table(*pdynamic_symbols
, local_symcount
,
2888 Output_section
* hashsec
= this->choose_output_section(NULL
, ".hash",
2891 false, false, true);
2893 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
2897 hashsec
->add_output_section_data(hashdata
);
2899 hashsec
->set_link_section(dynsym
);
2900 hashsec
->set_entsize(4);
2902 odyn
->add_section_address(elfcpp::DT_HASH
, hashsec
);
2905 if (strcmp(parameters
->options().hash_style(), "gnu") == 0
2906 || strcmp(parameters
->options().hash_style(), "both") == 0)
2908 unsigned char* phash
;
2909 unsigned int hashlen
;
2910 Dynobj::create_gnu_hash_table(*pdynamic_symbols
, local_symcount
,
2913 Output_section
* hashsec
= this->choose_output_section(NULL
, ".gnu.hash",
2914 elfcpp::SHT_GNU_HASH
,
2916 false, false, true);
2918 Output_section_data
* hashdata
= new Output_data_const_buffer(phash
,
2922 hashsec
->add_output_section_data(hashdata
);
2924 hashsec
->set_link_section(dynsym
);
2925 hashsec
->set_entsize(4);
2927 odyn
->add_section_address(elfcpp::DT_GNU_HASH
, hashsec
);
2931 // Assign offsets to each local portion of the dynamic symbol table.
2934 Layout::assign_local_dynsym_offsets(const Input_objects
* input_objects
)
2936 Output_section
* dynsym
= this->dynsym_section_
;
2937 gold_assert(dynsym
!= NULL
);
2939 off_t off
= dynsym
->offset();
2941 // Skip the dummy symbol at the start of the section.
2942 off
+= dynsym
->entsize();
2944 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
2945 p
!= input_objects
->relobj_end();
2948 unsigned int count
= (*p
)->set_local_dynsym_offset(off
);
2949 off
+= count
* dynsym
->entsize();
2953 // Create the version sections.
2956 Layout::create_version_sections(const Versions
* versions
,
2957 const Symbol_table
* symtab
,
2958 unsigned int local_symcount
,
2959 const std::vector
<Symbol
*>& dynamic_symbols
,
2960 const Output_section
* dynstr
)
2962 if (!versions
->any_defs() && !versions
->any_needs())
2965 switch (parameters
->size_and_endianness())
2967 #ifdef HAVE_TARGET_32_LITTLE
2968 case Parameters::TARGET_32_LITTLE
:
2969 this->sized_create_version_sections
<32, false>(versions
, symtab
,
2971 dynamic_symbols
, dynstr
);
2974 #ifdef HAVE_TARGET_32_BIG
2975 case Parameters::TARGET_32_BIG
:
2976 this->sized_create_version_sections
<32, true>(versions
, symtab
,
2978 dynamic_symbols
, dynstr
);
2981 #ifdef HAVE_TARGET_64_LITTLE
2982 case Parameters::TARGET_64_LITTLE
:
2983 this->sized_create_version_sections
<64, false>(versions
, symtab
,
2985 dynamic_symbols
, dynstr
);
2988 #ifdef HAVE_TARGET_64_BIG
2989 case Parameters::TARGET_64_BIG
:
2990 this->sized_create_version_sections
<64, true>(versions
, symtab
,
2992 dynamic_symbols
, dynstr
);
3000 // Create the version sections, sized version.
3002 template<int size
, bool big_endian
>
3004 Layout::sized_create_version_sections(
3005 const Versions
* versions
,
3006 const Symbol_table
* symtab
,
3007 unsigned int local_symcount
,
3008 const std::vector
<Symbol
*>& dynamic_symbols
,
3009 const Output_section
* dynstr
)
3011 Output_section
* vsec
= this->choose_output_section(NULL
, ".gnu.version",
3012 elfcpp::SHT_GNU_versym
,
3014 false, false, true);
3016 unsigned char* vbuf
;
3018 versions
->symbol_section_contents
<size
, big_endian
>(symtab
, &this->dynpool_
,
3023 Output_section_data
* vdata
= new Output_data_const_buffer(vbuf
, vsize
, 2,
3026 vsec
->add_output_section_data(vdata
);
3027 vsec
->set_entsize(2);
3028 vsec
->set_link_section(this->dynsym_section_
);
3030 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
3031 odyn
->add_section_address(elfcpp::DT_VERSYM
, vsec
);
3033 if (versions
->any_defs())
3035 Output_section
* vdsec
;
3036 vdsec
= this->choose_output_section(NULL
, ".gnu.version_d",
3037 elfcpp::SHT_GNU_verdef
,
3039 false, false, true);
3041 unsigned char* vdbuf
;
3042 unsigned int vdsize
;
3043 unsigned int vdentries
;
3044 versions
->def_section_contents
<size
, big_endian
>(&this->dynpool_
, &vdbuf
,
3045 &vdsize
, &vdentries
);
3047 Output_section_data
* vddata
=
3048 new Output_data_const_buffer(vdbuf
, vdsize
, 4, "** version defs");
3050 vdsec
->add_output_section_data(vddata
);
3051 vdsec
->set_link_section(dynstr
);
3052 vdsec
->set_info(vdentries
);
3054 odyn
->add_section_address(elfcpp::DT_VERDEF
, vdsec
);
3055 odyn
->add_constant(elfcpp::DT_VERDEFNUM
, vdentries
);
3058 if (versions
->any_needs())
3060 Output_section
* vnsec
;
3061 vnsec
= this->choose_output_section(NULL
, ".gnu.version_r",
3062 elfcpp::SHT_GNU_verneed
,
3064 false, false, true);
3066 unsigned char* vnbuf
;
3067 unsigned int vnsize
;
3068 unsigned int vnentries
;
3069 versions
->need_section_contents
<size
, big_endian
>(&this->dynpool_
,
3073 Output_section_data
* vndata
=
3074 new Output_data_const_buffer(vnbuf
, vnsize
, 4, "** version refs");
3076 vnsec
->add_output_section_data(vndata
);
3077 vnsec
->set_link_section(dynstr
);
3078 vnsec
->set_info(vnentries
);
3080 odyn
->add_section_address(elfcpp::DT_VERNEED
, vnsec
);
3081 odyn
->add_constant(elfcpp::DT_VERNEEDNUM
, vnentries
);
3085 // Create the .interp section and PT_INTERP segment.
3088 Layout::create_interp(const Target
* target
)
3090 const char* interp
= parameters
->options().dynamic_linker();
3093 interp
= target
->dynamic_linker();
3094 gold_assert(interp
!= NULL
);
3097 size_t len
= strlen(interp
) + 1;
3099 Output_section_data
* odata
= new Output_data_const(interp
, len
, 1);
3101 Output_section
* osec
= this->choose_output_section(NULL
, ".interp",
3102 elfcpp::SHT_PROGBITS
,
3105 osec
->add_output_section_data(odata
);
3107 if (!this->script_options_
->saw_phdrs_clause())
3109 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_INTERP
,
3111 oseg
->add_output_section(osec
, elfcpp::PF_R
, false);
3115 // Finish the .dynamic section and PT_DYNAMIC segment.
3118 Layout::finish_dynamic_section(const Input_objects
* input_objects
,
3119 const Symbol_table
* symtab
)
3121 if (!this->script_options_
->saw_phdrs_clause())
3123 Output_segment
* oseg
= this->make_output_segment(elfcpp::PT_DYNAMIC
,
3126 oseg
->add_output_section(this->dynamic_section_
,
3127 elfcpp::PF_R
| elfcpp::PF_W
,
3131 Output_data_dynamic
* const odyn
= this->dynamic_data_
;
3133 for (Input_objects::Dynobj_iterator p
= input_objects
->dynobj_begin();
3134 p
!= input_objects
->dynobj_end();
3137 if (!(*p
)->is_needed()
3138 && (*p
)->input_file()->options().as_needed())
3140 // This dynamic object was linked with --as-needed, but it
3145 odyn
->add_string(elfcpp::DT_NEEDED
, (*p
)->soname());
3148 if (parameters
->options().shared())
3150 const char* soname
= parameters
->options().soname();
3152 odyn
->add_string(elfcpp::DT_SONAME
, soname
);
3155 Symbol
* sym
= symtab
->lookup(parameters
->options().init());
3156 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
3157 odyn
->add_symbol(elfcpp::DT_INIT
, sym
);
3159 sym
= symtab
->lookup(parameters
->options().fini());
3160 if (sym
!= NULL
&& sym
->is_defined() && !sym
->is_from_dynobj())
3161 odyn
->add_symbol(elfcpp::DT_FINI
, sym
);
3163 // Look for .init_array, .preinit_array and .fini_array by checking
3165 for(Layout::Section_list::const_iterator p
= this->section_list_
.begin();
3166 p
!= this->section_list_
.end();
3168 switch((*p
)->type())
3170 case elfcpp::SHT_FINI_ARRAY
:
3171 odyn
->add_section_address(elfcpp::DT_FINI_ARRAY
, *p
);
3172 odyn
->add_section_size(elfcpp::DT_FINI_ARRAYSZ
, *p
);
3174 case elfcpp::SHT_INIT_ARRAY
:
3175 odyn
->add_section_address(elfcpp::DT_INIT_ARRAY
, *p
);
3176 odyn
->add_section_size(elfcpp::DT_INIT_ARRAYSZ
, *p
);
3178 case elfcpp::SHT_PREINIT_ARRAY
:
3179 odyn
->add_section_address(elfcpp::DT_PREINIT_ARRAY
, *p
);
3180 odyn
->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ
, *p
);
3186 // Add a DT_RPATH entry if needed.
3187 const General_options::Dir_list
& rpath(parameters
->options().rpath());
3190 std::string rpath_val
;
3191 for (General_options::Dir_list::const_iterator p
= rpath
.begin();
3195 if (rpath_val
.empty())
3196 rpath_val
= p
->name();
3199 // Eliminate duplicates.
3200 General_options::Dir_list::const_iterator q
;
3201 for (q
= rpath
.begin(); q
!= p
; ++q
)
3202 if (q
->name() == p
->name())
3207 rpath_val
+= p
->name();
3212 odyn
->add_string(elfcpp::DT_RPATH
, rpath_val
);
3213 if (parameters
->options().enable_new_dtags())
3214 odyn
->add_string(elfcpp::DT_RUNPATH
, rpath_val
);
3217 // Look for text segments that have dynamic relocations.
3218 bool have_textrel
= false;
3219 if (!this->script_options_
->saw_sections_clause())
3221 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
3222 p
!= this->segment_list_
.end();
3225 if (((*p
)->flags() & elfcpp::PF_W
) == 0
3226 && (*p
)->dynamic_reloc_count() > 0)
3228 have_textrel
= true;
3235 // We don't know the section -> segment mapping, so we are
3236 // conservative and just look for readonly sections with
3237 // relocations. If those sections wind up in writable segments,
3238 // then we have created an unnecessary DT_TEXTREL entry.
3239 for (Section_list::const_iterator p
= this->section_list_
.begin();
3240 p
!= this->section_list_
.end();
3243 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0
3244 && ((*p
)->flags() & elfcpp::SHF_WRITE
) == 0
3245 && ((*p
)->dynamic_reloc_count() > 0))
3247 have_textrel
= true;
3253 // Add a DT_FLAGS entry. We add it even if no flags are set so that
3254 // post-link tools can easily modify these flags if desired.
3255 unsigned int flags
= 0;
3258 // Add a DT_TEXTREL for compatibility with older loaders.
3259 odyn
->add_constant(elfcpp::DT_TEXTREL
, 0);
3260 flags
|= elfcpp::DF_TEXTREL
;
3262 if (parameters
->options().shared() && this->has_static_tls())
3263 flags
|= elfcpp::DF_STATIC_TLS
;
3264 if (parameters
->options().origin())
3265 flags
|= elfcpp::DF_ORIGIN
;
3266 if (parameters
->options().Bsymbolic())
3268 flags
|= elfcpp::DF_SYMBOLIC
;
3269 // Add DT_SYMBOLIC for compatibility with older loaders.
3270 odyn
->add_constant(elfcpp::DT_SYMBOLIC
, 0);
3272 if (parameters
->options().now())
3273 flags
|= elfcpp::DF_BIND_NOW
;
3274 odyn
->add_constant(elfcpp::DT_FLAGS
, flags
);
3277 if (parameters
->options().initfirst())
3278 flags
|= elfcpp::DF_1_INITFIRST
;
3279 if (parameters
->options().interpose())
3280 flags
|= elfcpp::DF_1_INTERPOSE
;
3281 if (parameters
->options().loadfltr())
3282 flags
|= elfcpp::DF_1_LOADFLTR
;
3283 if (parameters
->options().nodefaultlib())
3284 flags
|= elfcpp::DF_1_NODEFLIB
;
3285 if (parameters
->options().nodelete())
3286 flags
|= elfcpp::DF_1_NODELETE
;
3287 if (parameters
->options().nodlopen())
3288 flags
|= elfcpp::DF_1_NOOPEN
;
3289 if (parameters
->options().nodump())
3290 flags
|= elfcpp::DF_1_NODUMP
;
3291 if (!parameters
->options().shared())
3292 flags
&= ~(elfcpp::DF_1_INITFIRST
3293 | elfcpp::DF_1_NODELETE
3294 | elfcpp::DF_1_NOOPEN
);
3295 if (parameters
->options().origin())
3296 flags
|= elfcpp::DF_1_ORIGIN
;
3297 if (parameters
->options().now())
3298 flags
|= elfcpp::DF_1_NOW
;
3300 odyn
->add_constant(elfcpp::DT_FLAGS_1
, flags
);
3303 // The mapping of input section name prefixes to output section names.
3304 // In some cases one prefix is itself a prefix of another prefix; in
3305 // such a case the longer prefix must come first. These prefixes are
3306 // based on the GNU linker default ELF linker script.
3308 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
3309 const Layout::Section_name_mapping
Layout::section_name_mapping
[] =
3311 MAPPING_INIT(".text.", ".text"),
3312 MAPPING_INIT(".ctors.", ".ctors"),
3313 MAPPING_INIT(".dtors.", ".dtors"),
3314 MAPPING_INIT(".rodata.", ".rodata"),
3315 MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"),
3316 MAPPING_INIT(".data.rel.ro", ".data.rel.ro"),
3317 MAPPING_INIT(".data.", ".data"),
3318 MAPPING_INIT(".bss.", ".bss"),
3319 MAPPING_INIT(".tdata.", ".tdata"),
3320 MAPPING_INIT(".tbss.", ".tbss"),
3321 MAPPING_INIT(".init_array.", ".init_array"),
3322 MAPPING_INIT(".fini_array.", ".fini_array"),
3323 MAPPING_INIT(".sdata.", ".sdata"),
3324 MAPPING_INIT(".sbss.", ".sbss"),
3325 // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled
3326 // differently depending on whether it is creating a shared library.
3327 MAPPING_INIT(".sdata2.", ".sdata"),
3328 MAPPING_INIT(".sbss2.", ".sbss"),
3329 MAPPING_INIT(".lrodata.", ".lrodata"),
3330 MAPPING_INIT(".ldata.", ".ldata"),
3331 MAPPING_INIT(".lbss.", ".lbss"),
3332 MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"),
3333 MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"),
3334 MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"),
3335 MAPPING_INIT(".gnu.linkonce.t.", ".text"),
3336 MAPPING_INIT(".gnu.linkonce.r.", ".rodata"),
3337 MAPPING_INIT(".gnu.linkonce.d.", ".data"),
3338 MAPPING_INIT(".gnu.linkonce.b.", ".bss"),
3339 MAPPING_INIT(".gnu.linkonce.s.", ".sdata"),
3340 MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"),
3341 MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"),
3342 MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"),
3343 MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"),
3344 MAPPING_INIT(".gnu.linkonce.td.", ".tdata"),
3345 MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"),
3346 MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"),
3347 MAPPING_INIT(".gnu.linkonce.l.", ".ldata"),
3348 MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"),
3349 MAPPING_INIT(".ARM.extab.", ".ARM.extab"),
3350 MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"),
3351 MAPPING_INIT(".ARM.exidx.", ".ARM.exidx"),
3352 MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"),
3356 const int Layout::section_name_mapping_count
=
3357 (sizeof(Layout::section_name_mapping
)
3358 / sizeof(Layout::section_name_mapping
[0]));
3360 // Choose the output section name to use given an input section name.
3361 // Set *PLEN to the length of the name. *PLEN is initialized to the
3365 Layout::output_section_name(const char* name
, size_t* plen
)
3367 // gcc 4.3 generates the following sorts of section names when it
3368 // needs a section name specific to a function:
3374 // .data.rel.local.FN
3376 // .data.rel.ro.local.FN
3383 // The GNU linker maps all of those to the part before the .FN,
3384 // except that .data.rel.local.FN is mapped to .data, and
3385 // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections
3386 // beginning with .data.rel.ro.local are grouped together.
3388 // For an anonymous namespace, the string FN can contain a '.'.
3390 // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
3391 // GNU linker maps to .rodata.
3393 // The .data.rel.ro sections are used with -z relro. The sections
3394 // are recognized by name. We use the same names that the GNU
3395 // linker does for these sections.
3397 // It is hard to handle this in a principled way, so we don't even
3398 // try. We use a table of mappings. If the input section name is
3399 // not found in the table, we simply use it as the output section
3402 const Section_name_mapping
* psnm
= section_name_mapping
;
3403 for (int i
= 0; i
< section_name_mapping_count
; ++i
, ++psnm
)
3405 if (strncmp(name
, psnm
->from
, psnm
->fromlen
) == 0)
3407 *plen
= psnm
->tolen
;
3415 // Check if a comdat group or .gnu.linkonce section with the given
3416 // NAME is selected for the link. If there is already a section,
3417 // *KEPT_SECTION is set to point to the existing section and the
3418 // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and
3419 // IS_GROUP_NAME are recorded for this NAME in the layout object,
3420 // *KEPT_SECTION is set to the internal copy and the function returns
3424 Layout::find_or_add_kept_section(const std::string
& name
,
3429 Kept_section
** kept_section
)
3431 // It's normal to see a couple of entries here, for the x86 thunk
3432 // sections. If we see more than a few, we're linking a C++
3433 // program, and we resize to get more space to minimize rehashing.
3434 if (this->signatures_
.size() > 4
3435 && !this->resized_signatures_
)
3437 reserve_unordered_map(&this->signatures_
,
3438 this->number_of_input_files_
* 64);
3439 this->resized_signatures_
= true;
3442 Kept_section candidate
;
3443 std::pair
<Signatures::iterator
, bool> ins
=
3444 this->signatures_
.insert(std::make_pair(name
, candidate
));
3446 if (kept_section
!= NULL
)
3447 *kept_section
= &ins
.first
->second
;
3450 // This is the first time we've seen this signature.
3451 ins
.first
->second
.set_object(object
);
3452 ins
.first
->second
.set_shndx(shndx
);
3454 ins
.first
->second
.set_is_comdat();
3456 ins
.first
->second
.set_is_group_name();
3460 // We have already seen this signature.
3462 if (ins
.first
->second
.is_group_name())
3464 // We've already seen a real section group with this signature.
3465 // If the kept group is from a plugin object, and we're in the
3466 // replacement phase, accept the new one as a replacement.
3467 if (ins
.first
->second
.object() == NULL
3468 && parameters
->options().plugins()->in_replacement_phase())
3470 ins
.first
->second
.set_object(object
);
3471 ins
.first
->second
.set_shndx(shndx
);
3476 else if (is_group_name
)
3478 // This is a real section group, and we've already seen a
3479 // linkonce section with this signature. Record that we've seen
3480 // a section group, and don't include this section group.
3481 ins
.first
->second
.set_is_group_name();
3486 // We've already seen a linkonce section and this is a linkonce
3487 // section. These don't block each other--this may be the same
3488 // symbol name with different section types.
3493 // Store the allocated sections into the section list.
3496 Layout::get_allocated_sections(Section_list
* section_list
) const
3498 for (Section_list::const_iterator p
= this->section_list_
.begin();
3499 p
!= this->section_list_
.end();
3501 if (((*p
)->flags() & elfcpp::SHF_ALLOC
) != 0)
3502 section_list
->push_back(*p
);
3505 // Create an output segment.
3508 Layout::make_output_segment(elfcpp::Elf_Word type
, elfcpp::Elf_Word flags
)
3510 gold_assert(!parameters
->options().relocatable());
3511 Output_segment
* oseg
= new Output_segment(type
, flags
);
3512 this->segment_list_
.push_back(oseg
);
3514 if (type
== elfcpp::PT_TLS
)
3515 this->tls_segment_
= oseg
;
3516 else if (type
== elfcpp::PT_GNU_RELRO
)
3517 this->relro_segment_
= oseg
;
3522 // Write out the Output_sections. Most won't have anything to write,
3523 // since most of the data will come from input sections which are
3524 // handled elsewhere. But some Output_sections do have Output_data.
3527 Layout::write_output_sections(Output_file
* of
) const
3529 for (Section_list::const_iterator p
= this->section_list_
.begin();
3530 p
!= this->section_list_
.end();
3533 if (!(*p
)->after_input_sections())
3538 // Write out data not associated with a section or the symbol table.
3541 Layout::write_data(const Symbol_table
* symtab
, Output_file
* of
) const
3543 if (!parameters
->options().strip_all())
3545 const Output_section
* symtab_section
= this->symtab_section_
;
3546 for (Section_list::const_iterator p
= this->section_list_
.begin();
3547 p
!= this->section_list_
.end();
3550 if ((*p
)->needs_symtab_index())
3552 gold_assert(symtab_section
!= NULL
);
3553 unsigned int index
= (*p
)->symtab_index();
3554 gold_assert(index
> 0 && index
!= -1U);
3555 off_t off
= (symtab_section
->offset()
3556 + index
* symtab_section
->entsize());
3557 symtab
->write_section_symbol(*p
, this->symtab_xindex_
, of
, off
);
3562 const Output_section
* dynsym_section
= this->dynsym_section_
;
3563 for (Section_list::const_iterator p
= this->section_list_
.begin();
3564 p
!= this->section_list_
.end();
3567 if ((*p
)->needs_dynsym_index())
3569 gold_assert(dynsym_section
!= NULL
);
3570 unsigned int index
= (*p
)->dynsym_index();
3571 gold_assert(index
> 0 && index
!= -1U);
3572 off_t off
= (dynsym_section
->offset()
3573 + index
* dynsym_section
->entsize());
3574 symtab
->write_section_symbol(*p
, this->dynsym_xindex_
, of
, off
);
3578 // Write out the Output_data which are not in an Output_section.
3579 for (Data_list::const_iterator p
= this->special_output_list_
.begin();
3580 p
!= this->special_output_list_
.end();
3585 // Write out the Output_sections which can only be written after the
3586 // input sections are complete.
3589 Layout::write_sections_after_input_sections(Output_file
* of
)
3591 // Determine the final section offsets, and thus the final output
3592 // file size. Note we finalize the .shstrab last, to allow the
3593 // after_input_section sections to modify their section-names before
3595 if (this->any_postprocessing_sections_
)
3597 off_t off
= this->output_file_size_
;
3598 off
= this->set_section_offsets(off
, POSTPROCESSING_SECTIONS_PASS
);
3600 // Now that we've finalized the names, we can finalize the shstrab.
3602 this->set_section_offsets(off
,
3603 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
);
3605 if (off
> this->output_file_size_
)
3608 this->output_file_size_
= off
;
3612 for (Section_list::const_iterator p
= this->section_list_
.begin();
3613 p
!= this->section_list_
.end();
3616 if ((*p
)->after_input_sections())
3620 this->section_headers_
->write(of
);
3623 // If the build ID requires computing a checksum, do so here, and
3624 // write it out. We compute a checksum over the entire file because
3625 // that is simplest.
3628 Layout::write_build_id(Output_file
* of
) const
3630 if (this->build_id_note_
== NULL
)
3633 const unsigned char* iv
= of
->get_input_view(0, this->output_file_size_
);
3635 unsigned char* ov
= of
->get_output_view(this->build_id_note_
->offset(),
3636 this->build_id_note_
->data_size());
3638 const char* style
= parameters
->options().build_id();
3639 if (strcmp(style
, "sha1") == 0)
3642 sha1_init_ctx(&ctx
);
3643 sha1_process_bytes(iv
, this->output_file_size_
, &ctx
);
3644 sha1_finish_ctx(&ctx
, ov
);
3646 else if (strcmp(style
, "md5") == 0)
3650 md5_process_bytes(iv
, this->output_file_size_
, &ctx
);
3651 md5_finish_ctx(&ctx
, ov
);
3656 of
->write_output_view(this->build_id_note_
->offset(),
3657 this->build_id_note_
->data_size(),
3660 of
->free_input_view(0, this->output_file_size_
, iv
);
3663 // Write out a binary file. This is called after the link is
3664 // complete. IN is the temporary output file we used to generate the
3665 // ELF code. We simply walk through the segments, read them from
3666 // their file offset in IN, and write them to their load address in
3667 // the output file. FIXME: with a bit more work, we could support
3668 // S-records and/or Intel hex format here.
3671 Layout::write_binary(Output_file
* in
) const
3673 gold_assert(parameters
->options().oformat_enum()
3674 == General_options::OBJECT_FORMAT_BINARY
);
3676 // Get the size of the binary file.
3677 uint64_t max_load_address
= 0;
3678 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
3679 p
!= this->segment_list_
.end();
3682 if ((*p
)->type() == elfcpp::PT_LOAD
&& (*p
)->filesz() > 0)
3684 uint64_t max_paddr
= (*p
)->paddr() + (*p
)->filesz();
3685 if (max_paddr
> max_load_address
)
3686 max_load_address
= max_paddr
;
3690 Output_file
out(parameters
->options().output_file_name());
3691 out
.open(max_load_address
);
3693 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
3694 p
!= this->segment_list_
.end();
3697 if ((*p
)->type() == elfcpp::PT_LOAD
&& (*p
)->filesz() > 0)
3699 const unsigned char* vin
= in
->get_input_view((*p
)->offset(),
3701 unsigned char* vout
= out
.get_output_view((*p
)->paddr(),
3703 memcpy(vout
, vin
, (*p
)->filesz());
3704 out
.write_output_view((*p
)->paddr(), (*p
)->filesz(), vout
);
3705 in
->free_input_view((*p
)->offset(), (*p
)->filesz(), vin
);
3712 // Print the output sections to the map file.
3715 Layout::print_to_mapfile(Mapfile
* mapfile
) const
3717 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
3718 p
!= this->segment_list_
.end();
3720 (*p
)->print_sections_to_mapfile(mapfile
);
3723 // Print statistical information to stderr. This is used for --stats.
3726 Layout::print_stats() const
3728 this->namepool_
.print_stats("section name pool");
3729 this->sympool_
.print_stats("output symbol name pool");
3730 this->dynpool_
.print_stats("dynamic name pool");
3732 for (Section_list::const_iterator p
= this->section_list_
.begin();
3733 p
!= this->section_list_
.end();
3735 (*p
)->print_merge_stats();
3738 // Write_sections_task methods.
3740 // We can always run this task.
3743 Write_sections_task::is_runnable()
3748 // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER
3752 Write_sections_task::locks(Task_locker
* tl
)
3754 tl
->add(this, this->output_sections_blocker_
);
3755 tl
->add(this, this->final_blocker_
);
3758 // Run the task--write out the data.
3761 Write_sections_task::run(Workqueue
*)
3763 this->layout_
->write_output_sections(this->of_
);
3766 // Write_data_task methods.
3768 // We can always run this task.
3771 Write_data_task::is_runnable()
3776 // We need to unlock FINAL_BLOCKER when finished.
3779 Write_data_task::locks(Task_locker
* tl
)
3781 tl
->add(this, this->final_blocker_
);
3784 // Run the task--write out the data.
3787 Write_data_task::run(Workqueue
*)
3789 this->layout_
->write_data(this->symtab_
, this->of_
);
3792 // Write_symbols_task methods.
3794 // We can always run this task.
3797 Write_symbols_task::is_runnable()
3802 // We need to unlock FINAL_BLOCKER when finished.
3805 Write_symbols_task::locks(Task_locker
* tl
)
3807 tl
->add(this, this->final_blocker_
);
3810 // Run the task--write out the symbols.
3813 Write_symbols_task::run(Workqueue
*)
3815 this->symtab_
->write_globals(this->sympool_
, this->dynpool_
,
3816 this->layout_
->symtab_xindex(),
3817 this->layout_
->dynsym_xindex(), this->of_
);
3820 // Write_after_input_sections_task methods.
3822 // We can only run this task after the input sections have completed.
3825 Write_after_input_sections_task::is_runnable()
3827 if (this->input_sections_blocker_
->is_blocked())
3828 return this->input_sections_blocker_
;
3832 // We need to unlock FINAL_BLOCKER when finished.
3835 Write_after_input_sections_task::locks(Task_locker
* tl
)
3837 tl
->add(this, this->final_blocker_
);
3843 Write_after_input_sections_task::run(Workqueue
*)
3845 this->layout_
->write_sections_after_input_sections(this->of_
);
3848 // Close_task_runner methods.
3850 // Run the task--close the file.
3853 Close_task_runner::run(Workqueue
*, const Task
*)
3855 // If we need to compute a checksum for the BUILD if, we do so here.
3856 this->layout_
->write_build_id(this->of_
);
3858 // If we've been asked to create a binary file, we do so here.
3859 if (this->options_
->oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
3860 this->layout_
->write_binary(this->of_
);
3865 // Instantiate the templates we need. We could use the configure
3866 // script to restrict this to only the ones for implemented targets.
3868 #ifdef HAVE_TARGET_32_LITTLE
3871 Layout::layout
<32, false>(Sized_relobj
<32, false>* object
, unsigned int shndx
,
3873 const elfcpp::Shdr
<32, false>& shdr
,
3874 unsigned int, unsigned int, off_t
*);
3877 #ifdef HAVE_TARGET_32_BIG
3880 Layout::layout
<32, true>(Sized_relobj
<32, true>* object
, unsigned int shndx
,
3882 const elfcpp::Shdr
<32, true>& shdr
,
3883 unsigned int, unsigned int, off_t
*);
3886 #ifdef HAVE_TARGET_64_LITTLE
3889 Layout::layout
<64, false>(Sized_relobj
<64, false>* object
, unsigned int shndx
,
3891 const elfcpp::Shdr
<64, false>& shdr
,
3892 unsigned int, unsigned int, off_t
*);
3895 #ifdef HAVE_TARGET_64_BIG
3898 Layout::layout
<64, true>(Sized_relobj
<64, true>* object
, unsigned int shndx
,
3900 const elfcpp::Shdr
<64, true>& shdr
,
3901 unsigned int, unsigned int, off_t
*);
3904 #ifdef HAVE_TARGET_32_LITTLE
3907 Layout::layout_reloc
<32, false>(Sized_relobj
<32, false>* object
,
3908 unsigned int reloc_shndx
,
3909 const elfcpp::Shdr
<32, false>& shdr
,
3910 Output_section
* data_section
,
3911 Relocatable_relocs
* rr
);
3914 #ifdef HAVE_TARGET_32_BIG
3917 Layout::layout_reloc
<32, true>(Sized_relobj
<32, true>* object
,
3918 unsigned int reloc_shndx
,
3919 const elfcpp::Shdr
<32, true>& shdr
,
3920 Output_section
* data_section
,
3921 Relocatable_relocs
* rr
);
3924 #ifdef HAVE_TARGET_64_LITTLE
3927 Layout::layout_reloc
<64, false>(Sized_relobj
<64, false>* object
,
3928 unsigned int reloc_shndx
,
3929 const elfcpp::Shdr
<64, false>& shdr
,
3930 Output_section
* data_section
,
3931 Relocatable_relocs
* rr
);
3934 #ifdef HAVE_TARGET_64_BIG
3937 Layout::layout_reloc
<64, true>(Sized_relobj
<64, true>* object
,
3938 unsigned int reloc_shndx
,
3939 const elfcpp::Shdr
<64, true>& shdr
,
3940 Output_section
* data_section
,
3941 Relocatable_relocs
* rr
);
3944 #ifdef HAVE_TARGET_32_LITTLE
3947 Layout::layout_group
<32, false>(Symbol_table
* symtab
,
3948 Sized_relobj
<32, false>* object
,
3950 const char* group_section_name
,
3951 const char* signature
,
3952 const elfcpp::Shdr
<32, false>& shdr
,
3953 elfcpp::Elf_Word flags
,
3954 std::vector
<unsigned int>* shndxes
);
3957 #ifdef HAVE_TARGET_32_BIG
3960 Layout::layout_group
<32, true>(Symbol_table
* symtab
,
3961 Sized_relobj
<32, true>* object
,
3963 const char* group_section_name
,
3964 const char* signature
,
3965 const elfcpp::Shdr
<32, true>& shdr
,
3966 elfcpp::Elf_Word flags
,
3967 std::vector
<unsigned int>* shndxes
);
3970 #ifdef HAVE_TARGET_64_LITTLE
3973 Layout::layout_group
<64, false>(Symbol_table
* symtab
,
3974 Sized_relobj
<64, false>* object
,
3976 const char* group_section_name
,
3977 const char* signature
,
3978 const elfcpp::Shdr
<64, false>& shdr
,
3979 elfcpp::Elf_Word flags
,
3980 std::vector
<unsigned int>* shndxes
);
3983 #ifdef HAVE_TARGET_64_BIG
3986 Layout::layout_group
<64, true>(Symbol_table
* symtab
,
3987 Sized_relobj
<64, true>* object
,
3989 const char* group_section_name
,
3990 const char* signature
,
3991 const elfcpp::Shdr
<64, true>& shdr
,
3992 elfcpp::Elf_Word flags
,
3993 std::vector
<unsigned int>* shndxes
);
3996 #ifdef HAVE_TARGET_32_LITTLE
3999 Layout::layout_eh_frame
<32, false>(Sized_relobj
<32, false>* object
,
4000 const unsigned char* symbols
,
4002 const unsigned char* symbol_names
,
4003 off_t symbol_names_size
,
4005 const elfcpp::Shdr
<32, false>& shdr
,
4006 unsigned int reloc_shndx
,
4007 unsigned int reloc_type
,
4011 #ifdef HAVE_TARGET_32_BIG
4014 Layout::layout_eh_frame
<32, true>(Sized_relobj
<32, true>* object
,
4015 const unsigned char* symbols
,
4017 const unsigned char* symbol_names
,
4018 off_t symbol_names_size
,
4020 const elfcpp::Shdr
<32, true>& shdr
,
4021 unsigned int reloc_shndx
,
4022 unsigned int reloc_type
,
4026 #ifdef HAVE_TARGET_64_LITTLE
4029 Layout::layout_eh_frame
<64, false>(Sized_relobj
<64, false>* object
,
4030 const unsigned char* symbols
,
4032 const unsigned char* symbol_names
,
4033 off_t symbol_names_size
,
4035 const elfcpp::Shdr
<64, false>& shdr
,
4036 unsigned int reloc_shndx
,
4037 unsigned int reloc_type
,
4041 #ifdef HAVE_TARGET_64_BIG
4044 Layout::layout_eh_frame
<64, true>(Sized_relobj
<64, true>* object
,
4045 const unsigned char* symbols
,
4047 const unsigned char* symbol_names
,
4048 off_t symbol_names_size
,
4050 const elfcpp::Shdr
<64, true>& shdr
,
4051 unsigned int reloc_shndx
,
4052 unsigned int reloc_type
,
4056 } // End namespace gold.