1 // layout.cc -- lay out output file sections for gold
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
30 #include "parameters.h"
33 #include "script-sections.h"
38 #include "compressed_output.h"
45 // Layout_task_runner methods.
47 // Lay out the sections. This is called after all the input objects
51 Layout_task_runner::run(Workqueue* workqueue, const Task* task)
53 off_t file_size = this->layout_->finalize(this->input_objects_,
57 // Now we know the final size of the output file and we know where
58 // each piece of information goes.
59 Output_file* of = new Output_file(parameters->output_file_name());
62 // Queue up the final set of tasks.
63 gold::queue_final_tasks(this->options_, this->input_objects_,
64 this->symtab_, this->layout_, workqueue, of);
69 Layout::Layout(const General_options& options, Script_options* script_options)
70 : options_(options), script_options_(script_options), namepool_(),
71 sympool_(), dynpool_(), signatures_(),
72 section_name_map_(), segment_list_(), section_list_(),
73 unattached_section_list_(), special_output_list_(),
74 section_headers_(NULL), tls_segment_(NULL), symtab_section_(NULL),
75 dynsym_section_(NULL), dynamic_section_(NULL), dynamic_data_(NULL),
76 eh_frame_section_(NULL), group_signatures_(), output_file_size_(-1),
77 input_requires_executable_stack_(false),
78 input_with_gnu_stack_note_(false),
79 input_without_gnu_stack_note_(false),
80 has_static_tls_(false),
81 any_postprocessing_sections_(false)
83 // Make space for more than enough segments for a typical file.
84 // This is just for efficiency--it's OK if we wind up needing more.
85 this->segment_list_.reserve(12);
87 // We expect two unattached Output_data objects: the file header and
88 // the segment headers.
89 this->special_output_list_.reserve(2);
92 // Hash a key we use to look up an output section mapping.
95 Layout::Hash_key::operator()(const Layout::Key& k) const
97 return k.first + k.second.first + k.second.second;
100 // Return whether PREFIX is a prefix of STR.
103 is_prefix_of(const char* prefix, const char* str)
105 return strncmp(prefix, str, strlen(prefix)) == 0;
108 // Returns whether the given section is in the list of
109 // debug-sections-used-by-some-version-of-gdb. Currently,
110 // we've checked versions of gdb up to and including 6.7.1.
112 static const char* gdb_sections[] =
114 // ".debug_aranges", // not used by gdb as of 6.7.1
120 // ".debug_pubnames", // not used by gdb as of 6.7.1
126 is_gdb_debug_section(const char* str)
128 // We can do this faster: binary search or a hashtable. But why bother?
129 for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i)
130 if (strcmp(str, gdb_sections[i]) == 0)
135 // Whether to include this section in the link.
137 template<int size, bool big_endian>
139 Layout::include_section(Sized_relobj<size, big_endian>*, const char* name,
140 const elfcpp::Shdr<size, big_endian>& shdr)
142 switch (shdr.get_sh_type())
144 case elfcpp::SHT_NULL:
145 case elfcpp::SHT_SYMTAB:
146 case elfcpp::SHT_DYNSYM:
147 case elfcpp::SHT_STRTAB:
148 case elfcpp::SHT_HASH:
149 case elfcpp::SHT_DYNAMIC:
150 case elfcpp::SHT_SYMTAB_SHNDX:
153 case elfcpp::SHT_RELA:
154 case elfcpp::SHT_REL:
155 case elfcpp::SHT_GROUP:
156 // For a relocatable link these should be handled elsewhere.
157 gold_assert(!parameters->output_is_object());
160 case elfcpp::SHT_PROGBITS:
161 if (parameters->strip_debug()
162 && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
164 // Debugging sections can only be recognized by name.
165 if (is_prefix_of(".debug", name)
166 || is_prefix_of(".gnu.linkonce.wi.", name)
167 || is_prefix_of(".line", name)
168 || is_prefix_of(".stab", name))
171 if (parameters->strip_debug_gdb()
172 && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
174 // Debugging sections can only be recognized by name.
175 if (is_prefix_of(".debug", name)
176 && !is_gdb_debug_section(name))
186 // Return an output section named NAME, or NULL if there is none.
189 Layout::find_output_section(const char* name) const
191 for (Section_list::const_iterator p = this->section_list_.begin();
192 p != this->section_list_.end();
194 if (strcmp((*p)->name(), name) == 0)
199 // Return an output segment of type TYPE, with segment flags SET set
200 // and segment flags CLEAR clear. Return NULL if there is none.
203 Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
204 elfcpp::Elf_Word clear) const
206 for (Segment_list::const_iterator p = this->segment_list_.begin();
207 p != this->segment_list_.end();
209 if (static_cast<elfcpp::PT>((*p)->type()) == type
210 && ((*p)->flags() & set) == set
211 && ((*p)->flags() & clear) == 0)
216 // Return the output section to use for section NAME with type TYPE
217 // and section flags FLAGS. NAME must be canonicalized in the string
218 // pool, and NAME_KEY is the key.
221 Layout::get_output_section(const char* name, Stringpool::Key name_key,
222 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags)
224 const Key key(name_key, std::make_pair(type, flags));
225 const std::pair<Key, Output_section*> v(key, NULL);
226 std::pair<Section_name_map::iterator, bool> ins(
227 this->section_name_map_.insert(v));
230 return ins.first->second;
233 // This is the first time we've seen this name/type/flags
235 Output_section* os = this->make_output_section(name, type, flags);
236 ins.first->second = os;
241 // Pick the output section to use for section NAME, in input file
242 // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a
243 // linker created section. ADJUST_NAME is true if we should apply the
244 // standard name mappings in Layout::output_section_name. This will
245 // return NULL if the input section should be discarded.
248 Layout::choose_output_section(const Relobj* relobj, const char* name,
249 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
252 // We should ignore some flags. FIXME: This will need some
253 // adjustment for ld -r.
254 flags &= ~ (elfcpp::SHF_INFO_LINK
255 | elfcpp::SHF_LINK_ORDER
258 | elfcpp::SHF_STRINGS);
260 if (this->script_options_->saw_sections_clause())
262 // We are using a SECTIONS clause, so the output section is
263 // chosen based only on the name.
265 Script_sections* ss = this->script_options_->script_sections();
266 const char* file_name = relobj == NULL ? NULL : relobj->name().c_str();
267 Output_section** output_section_slot;
268 name = ss->output_section_name(file_name, name, &output_section_slot);
271 // The SECTIONS clause says to discard this input section.
275 // If this is an orphan section--one not mentioned in the linker
276 // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the
277 // default processing below.
279 if (output_section_slot != NULL)
281 if (*output_section_slot != NULL)
282 return *output_section_slot;
284 // We don't put sections found in the linker script into
285 // SECTION_NAME_MAP_. That keeps us from getting confused
286 // if an orphan section is mapped to a section with the same
287 // name as one in the linker script.
289 name = this->namepool_.add(name, false, NULL);
291 Output_section* os = this->make_output_section(name, type, flags);
292 os->set_found_in_sections_clause();
293 *output_section_slot = os;
298 // FIXME: Handle SHF_OS_NONCONFORMING somewhere.
300 // Turn NAME from the name of the input section into the name of the
303 size_t len = strlen(name);
304 if (adjust_name && !parameters->output_is_object())
305 name = Layout::output_section_name(name, &len);
307 Stringpool::Key name_key;
308 name = this->namepool_.add_with_length(name, len, true, &name_key);
310 // Find or make the output section. The output section is selected
311 // based on the section name, type, and flags.
312 return this->get_output_section(name, name_key, type, flags);
315 // Return the output section to use for input section SHNDX, with name
316 // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the
317 // index of a relocation section which applies to this section, or 0
318 // if none, or -1U if more than one. RELOC_TYPE is the type of the
319 // relocation section if there is one. Set *OFF to the offset of this
320 // input section without the output section. Return NULL if the
321 // section should be discarded. Set *OFF to -1 if the section
322 // contents should not be written directly to the output file, but
323 // will instead receive special handling.
325 template<int size, bool big_endian>
327 Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx,
328 const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
329 unsigned int reloc_shndx, unsigned int, off_t* off)
331 if (!this->include_section(object, name, shdr))
336 // In a relocatable link a grouped section must not be combined with
337 // any other sections.
338 if (parameters->output_is_object()
339 && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0)
341 name = this->namepool_.add(name, true, NULL);
342 os = this->make_output_section(name, shdr.get_sh_type(),
343 shdr.get_sh_flags());
347 os = this->choose_output_section(object, name, shdr.get_sh_type(),
348 shdr.get_sh_flags(), true);
353 // FIXME: Handle SHF_LINK_ORDER somewhere.
355 *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx,
356 this->script_options_->saw_sections_clause());
361 // Handle a relocation section when doing a relocatable link.
363 template<int size, bool big_endian>
365 Layout::layout_reloc(Sized_relobj<size, big_endian>* object,
367 const elfcpp::Shdr<size, big_endian>& shdr,
368 Output_section* data_section,
369 Relocatable_relocs* rr)
371 gold_assert(parameters->output_is_object());
373 int sh_type = shdr.get_sh_type();
376 if (sh_type == elfcpp::SHT_REL)
378 else if (sh_type == elfcpp::SHT_RELA)
382 name += data_section->name();
384 Output_section* os = this->choose_output_section(object, name.c_str(),
389 os->set_should_link_to_symtab();
390 os->set_info_section(data_section);
392 Output_section_data* posd;
393 if (sh_type == elfcpp::SHT_REL)
395 os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
396 posd = new Output_relocatable_relocs<elfcpp::SHT_REL,
400 else if (sh_type == elfcpp::SHT_RELA)
402 os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
403 posd = new Output_relocatable_relocs<elfcpp::SHT_RELA,
410 os->add_output_section_data(posd);
411 rr->set_output_data(posd);
416 // Handle a group section when doing a relocatable link.
418 template<int size, bool big_endian>
420 Layout::layout_group(Symbol_table* symtab,
421 Sized_relobj<size, big_endian>* object,
423 const char* group_section_name,
424 const char* signature,
425 const elfcpp::Shdr<size, big_endian>& shdr,
426 const elfcpp::Elf_Word* contents)
428 gold_assert(parameters->output_is_object());
429 gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP);
430 group_section_name = this->namepool_.add(group_section_name, true, NULL);
431 Output_section* os = this->make_output_section(group_section_name,
433 shdr.get_sh_flags());
435 // We need to find a symbol with the signature in the symbol table.
436 // If we don't find one now, we need to look again later.
437 Symbol* sym = symtab->lookup(signature, NULL);
439 os->set_info_symndx(sym);
442 // We will wind up using a symbol whose name is the signature.
443 // So just put the signature in the symbol name pool to save it.
444 signature = symtab->canonicalize_name(signature);
445 this->group_signatures_.push_back(Group_signature(os, signature));
448 os->set_should_link_to_symtab();
451 section_size_type entry_count =
452 convert_to_section_size_type(shdr.get_sh_size() / 4);
453 Output_section_data* posd =
454 new Output_data_group<size, big_endian>(object, entry_count, contents);
455 os->add_output_section_data(posd);
458 // Special GNU handling of sections name .eh_frame. They will
459 // normally hold exception frame data as defined by the C++ ABI
460 // (http://codesourcery.com/cxx-abi/).
462 template<int size, bool big_endian>
464 Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object,
465 const unsigned char* symbols,
467 const unsigned char* symbol_names,
468 off_t symbol_names_size,
470 const elfcpp::Shdr<size, big_endian>& shdr,
471 unsigned int reloc_shndx, unsigned int reloc_type,
474 gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS);
475 gold_assert(shdr.get_sh_flags() == elfcpp::SHF_ALLOC);
477 const char* const name = ".eh_frame";
478 Output_section* os = this->choose_output_section(object,
480 elfcpp::SHT_PROGBITS,
486 if (this->eh_frame_section_ == NULL)
488 this->eh_frame_section_ = os;
489 this->eh_frame_data_ = new Eh_frame();
490 os->add_output_section_data(this->eh_frame_data_);
492 if (this->options_.create_eh_frame_hdr())
494 Output_section* hdr_os =
495 this->choose_output_section(NULL,
497 elfcpp::SHT_PROGBITS,
503 Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os,
504 this->eh_frame_data_);
505 hdr_os->add_output_section_data(hdr_posd);
507 hdr_os->set_after_input_sections();
509 if (!this->script_options_->saw_phdrs_clause())
511 Output_segment* hdr_oseg;
512 hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME,
514 hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R);
517 this->eh_frame_data_->set_eh_frame_hdr(hdr_posd);
522 gold_assert(this->eh_frame_section_ == os);
524 if (this->eh_frame_data_->add_ehframe_input_section(object,
535 // We couldn't handle this .eh_frame section for some reason.
536 // Add it as a normal section.
537 bool saw_sections_clause = this->script_options_->saw_sections_clause();
538 *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx,
539 saw_sections_clause);
545 // Add POSD to an output section using NAME, TYPE, and FLAGS.
548 Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type,
549 elfcpp::Elf_Xword flags,
550 Output_section_data* posd)
552 Output_section* os = this->choose_output_section(NULL, name, type, flags,
555 os->add_output_section_data(posd);
558 // Map section flags to segment flags.
561 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags)
563 elfcpp::Elf_Word ret = elfcpp::PF_R;
564 if ((flags & elfcpp::SHF_WRITE) != 0)
566 if ((flags & elfcpp::SHF_EXECINSTR) != 0)
571 // Sometimes we compress sections. This is typically done for
572 // sections that are not part of normal program execution (such as
573 // .debug_* sections), and where the readers of these sections know
574 // how to deal with compressed sections. (To make it easier for them,
575 // we will rename the ouput section in such cases from .foo to
576 // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine
577 // doesn't say for certain whether we'll compress -- it depends on
578 // commandline options as well -- just whether this section is a
579 // candidate for compression.
582 is_compressible_debug_section(const char* secname)
584 return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0);
587 // Make a new Output_section, and attach it to segments as
591 Layout::make_output_section(const char* name, elfcpp::Elf_Word type,
592 elfcpp::Elf_Xword flags)
595 if ((flags & elfcpp::SHF_ALLOC) == 0
596 && this->options_.compress_debug_sections()
597 && is_compressible_debug_section(name))
598 os = new Output_compressed_section(&this->options_, name, type, flags);
600 os = new Output_section(name, type, flags);
602 this->section_list_.push_back(os);
604 if ((flags & elfcpp::SHF_ALLOC) == 0)
605 this->unattached_section_list_.push_back(os);
608 if (parameters->output_is_object())
611 // If we have a SECTIONS clause, we can't handle the attachment
612 // to segments until after we've seen all the sections.
613 if (this->script_options_->saw_sections_clause())
616 gold_assert(!this->script_options_->saw_phdrs_clause());
618 // This output section goes into a PT_LOAD segment.
620 elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags);
622 // The only thing we really care about for PT_LOAD segments is
623 // whether or not they are writable, so that is how we search
624 // for them. People who need segments sorted on some other
625 // basis will have to wait until we implement a mechanism for
626 // them to describe the segments they want.
628 Segment_list::const_iterator p;
629 for (p = this->segment_list_.begin();
630 p != this->segment_list_.end();
633 if ((*p)->type() == elfcpp::PT_LOAD
634 && ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))
636 (*p)->add_output_section(os, seg_flags);
641 if (p == this->segment_list_.end())
643 Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD,
645 oseg->add_output_section(os, seg_flags);
648 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
650 if (type == elfcpp::SHT_NOTE)
652 // See if we already have an equivalent PT_NOTE segment.
653 for (p = this->segment_list_.begin();
654 p != segment_list_.end();
657 if ((*p)->type() == elfcpp::PT_NOTE
658 && (((*p)->flags() & elfcpp::PF_W)
659 == (seg_flags & elfcpp::PF_W)))
661 (*p)->add_output_section(os, seg_flags);
666 if (p == this->segment_list_.end())
668 Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE,
670 oseg->add_output_section(os, seg_flags);
674 // If we see a loadable SHF_TLS section, we create a PT_TLS
675 // segment. There can only be one such segment.
676 if ((flags & elfcpp::SHF_TLS) != 0)
678 if (this->tls_segment_ == NULL)
679 this->tls_segment_ = this->make_output_segment(elfcpp::PT_TLS,
681 this->tls_segment_->add_output_section(os, seg_flags);
688 // Return the number of segments we expect to see.
691 Layout::expected_segment_count() const
693 size_t ret = this->segment_list_.size();
695 // If we didn't see a SECTIONS clause in a linker script, we should
696 // already have the complete list of segments. Otherwise we ask the
697 // SECTIONS clause how many segments it expects, and add in the ones
698 // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.)
700 if (!this->script_options_->saw_sections_clause())
704 const Script_sections* ss = this->script_options_->script_sections();
705 return ret + ss->expected_segment_count(this);
709 // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK
710 // is whether we saw a .note.GNU-stack section in the object file.
711 // GNU_STACK_FLAGS is the section flags. The flags give the
712 // protection required for stack memory. We record this in an
713 // executable as a PT_GNU_STACK segment. If an object file does not
714 // have a .note.GNU-stack segment, we must assume that it is an old
715 // object. On some targets that will force an executable stack.
718 Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags)
721 this->input_without_gnu_stack_note_ = true;
724 this->input_with_gnu_stack_note_ = true;
725 if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0)
726 this->input_requires_executable_stack_ = true;
730 // Create the dynamic sections which are needed before we read the
734 Layout::create_initial_dynamic_sections(Symbol_table* symtab)
736 if (parameters->doing_static_link())
739 this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic",
742 | elfcpp::SHF_WRITE),
745 symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0,
746 elfcpp::STT_OBJECT, elfcpp::STB_LOCAL,
747 elfcpp::STV_HIDDEN, 0, false, false);
749 this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_);
751 this->dynamic_section_->add_output_section_data(this->dynamic_data_);
754 // For each output section whose name can be represented as C symbol,
755 // define __start and __stop symbols for the section. This is a GNU
759 Layout::define_section_symbols(Symbol_table* symtab)
761 for (Section_list::const_iterator p = this->section_list_.begin();
762 p != this->section_list_.end();
765 const char* const name = (*p)->name();
766 if (name[strspn(name,
768 "ABCDEFGHIJKLMNOPWRSTUVWXYZ"
769 "abcdefghijklmnopqrstuvwxyz"
773 const std::string name_string(name);
774 const std::string start_name("__start_" + name_string);
775 const std::string stop_name("__stop_" + name_string);
777 symtab->define_in_output_data(start_name.c_str(),
786 false, // offset_is_from_end
787 true); // only_if_ref
789 symtab->define_in_output_data(stop_name.c_str(),
798 true, // offset_is_from_end
799 true); // only_if_ref
804 // Define symbols for group signatures.
807 Layout::define_group_signatures(Symbol_table* symtab)
809 for (Group_signatures::iterator p = this->group_signatures_.begin();
810 p != this->group_signatures_.end();
813 Symbol* sym = symtab->lookup(p->signature, NULL);
815 p->section->set_info_symndx(sym);
818 // Force the name of the group section to the group
819 // signature, and use the group's section symbol as the
821 if (strcmp(p->section->name(), p->signature) != 0)
823 const char* name = this->namepool_.add(p->signature,
825 p->section->set_name(name);
827 p->section->set_needs_symtab_index();
828 p->section->set_info_section_symndx(p->section);
832 this->group_signatures_.clear();
835 // Find the first read-only PT_LOAD segment, creating one if
839 Layout::find_first_load_seg()
841 for (Segment_list::const_iterator p = this->segment_list_.begin();
842 p != this->segment_list_.end();
845 if ((*p)->type() == elfcpp::PT_LOAD
846 && ((*p)->flags() & elfcpp::PF_R) != 0
847 && ((*p)->flags() & elfcpp::PF_W) == 0)
851 gold_assert(!this->script_options_->saw_phdrs_clause());
853 Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD,
858 // Finalize the layout. When this is called, we have created all the
859 // output sections and all the output segments which are based on
860 // input sections. We have several things to do, and we have to do
861 // them in the right order, so that we get the right results correctly
864 // 1) Finalize the list of output segments and create the segment
867 // 2) Finalize the dynamic symbol table and associated sections.
869 // 3) Determine the final file offset of all the output segments.
871 // 4) Determine the final file offset of all the SHF_ALLOC output
874 // 5) Create the symbol table sections and the section name table
877 // 6) Finalize the symbol table: set symbol values to their final
878 // value and make a final determination of which symbols are going
879 // into the output symbol table.
881 // 7) Create the section table header.
883 // 8) Determine the final file offset of all the output sections which
884 // are not SHF_ALLOC, including the section table header.
886 // 9) Finalize the ELF file header.
888 // This function returns the size of the output file.
891 Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab,
894 Target* const target = input_objects->target();
896 target->finalize_sections(this);
898 this->count_local_symbols(task, input_objects);
900 this->create_gold_note();
901 this->create_executable_stack_info(target);
903 Output_segment* phdr_seg = NULL;
904 if (!parameters->output_is_object() && !parameters->doing_static_link())
906 // There was a dynamic object in the link. We need to create
907 // some information for the dynamic linker.
909 // Create the PT_PHDR segment which will hold the program
911 if (!this->script_options_->saw_phdrs_clause())
912 phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R);
914 // Create the dynamic symbol table, including the hash table.
915 Output_section* dynstr;
916 std::vector<Symbol*> dynamic_symbols;
917 unsigned int local_dynamic_count;
918 Versions versions(this->options_, &this->dynpool_);
919 this->create_dynamic_symtab(input_objects, symtab, &dynstr,
920 &local_dynamic_count, &dynamic_symbols,
923 // Create the .interp section to hold the name of the
924 // interpreter, and put it in a PT_INTERP segment.
925 if (!parameters->output_is_shared())
926 this->create_interp(target);
928 // Finish the .dynamic section to hold the dynamic data, and put
929 // it in a PT_DYNAMIC segment.
930 this->finish_dynamic_section(input_objects, symtab);
932 // We should have added everything we need to the dynamic string
934 this->dynpool_.set_string_offsets();
936 // Create the version sections. We can't do this until the
937 // dynamic string table is complete.
938 this->create_version_sections(&versions, symtab, local_dynamic_count,
939 dynamic_symbols, dynstr);
942 // If there is a SECTIONS clause, put all the input sections into
943 // the required order.
944 Output_segment* load_seg;
945 if (parameters->output_is_object())
947 else if (this->script_options_->saw_sections_clause())
948 load_seg = this->set_section_addresses_from_script(symtab);
950 load_seg = this->find_first_load_seg();
952 gold_assert(phdr_seg == NULL || load_seg != NULL);
954 // Lay out the segment headers.
955 Output_segment_headers* segment_headers;
956 if (parameters->output_is_object())
957 segment_headers = NULL;
960 segment_headers = new Output_segment_headers(this->segment_list_);
961 if (load_seg != NULL)
962 load_seg->add_initial_output_data(segment_headers);
963 if (phdr_seg != NULL)
964 phdr_seg->add_initial_output_data(segment_headers);
967 // Lay out the file header.
968 Output_file_header* file_header;
969 file_header = new Output_file_header(target, symtab, segment_headers,
970 this->script_options_->entry());
971 if (load_seg != NULL)
972 load_seg->add_initial_output_data(file_header);
974 this->special_output_list_.push_back(file_header);
975 if (segment_headers != NULL)
976 this->special_output_list_.push_back(segment_headers);
978 if (this->script_options_->saw_phdrs_clause()
979 && !parameters->output_is_object())
981 // Support use of FILEHDRS and PHDRS attachments in a PHDRS
982 // clause in a linker script.
983 Script_sections* ss = this->script_options_->script_sections();
984 ss->put_headers_in_phdrs(file_header, segment_headers);
987 // We set the output section indexes in set_segment_offsets and
988 // set_section_indexes.
989 unsigned int shndx = 1;
991 // Set the file offsets of all the segments, and all the sections
994 if (!parameters->output_is_object())
995 off = this->set_segment_offsets(target, load_seg, &shndx);
997 off = this->set_relocatable_section_offsets(file_header, &shndx);
999 // Set the file offsets of all the non-data sections we've seen so
1000 // far which don't have to wait for the input sections. We need
1001 // this in order to finalize local symbols in non-allocated
1003 off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS);
1005 // Create the symbol table sections.
1006 this->create_symtab_sections(input_objects, symtab, &off);
1007 if (!parameters->doing_static_link())
1008 this->assign_local_dynsym_offsets(input_objects);
1010 // Process any symbol assignments from a linker script. This must
1011 // be called after the symbol table has been finalized.
1012 this->script_options_->finalize_symbols(symtab, this);
1014 // Create the .shstrtab section.
1015 Output_section* shstrtab_section = this->create_shstrtab();
1017 // Set the file offsets of the rest of the non-data sections which
1018 // don't have to wait for the input sections.
1019 off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS);
1021 // Now that all sections have been created, set the section indexes.
1022 shndx = this->set_section_indexes(shndx);
1024 // Create the section table header.
1025 this->create_shdrs(&off);
1027 // If there are no sections which require postprocessing, we can
1028 // handle the section names now, and avoid a resize later.
1029 if (!this->any_postprocessing_sections_)
1030 off = this->set_section_offsets(off,
1031 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS);
1033 file_header->set_section_info(this->section_headers_, shstrtab_section);
1035 // Now we know exactly where everything goes in the output file
1036 // (except for non-allocated sections which require postprocessing).
1037 Output_data::layout_complete();
1039 this->output_file_size_ = off;
1044 // Create a .note section for an executable or shared library. This
1045 // records the version of gold used to create the binary.
1048 Layout::create_gold_note()
1050 if (parameters->output_is_object())
1053 // Authorities all agree that the values in a .note field should
1054 // be aligned on 4-byte boundaries for 32-bit binaries. However,
1055 // they differ on what the alignment is for 64-bit binaries.
1056 // The GABI says unambiguously they take 8-byte alignment:
1057 // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section
1058 // Other documentation says alignment should always be 4 bytes:
1059 // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format
1060 // GNU ld and GNU readelf both support the latter (at least as of
1061 // version 2.16.91), and glibc always generates the latter for
1062 // .note.ABI-tag (as of version 1.6), so that's the one we go with
1064 #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default.
1065 const int size = parameters->get_size();
1067 const int size = 32;
1070 // The contents of the .note section.
1071 const char* name = "GNU";
1072 std::string desc(std::string("gold ") + gold::get_version_string());
1073 size_t namesz = strlen(name) + 1;
1074 size_t aligned_namesz = align_address(namesz, size / 8);
1075 size_t descsz = desc.length() + 1;
1076 size_t aligned_descsz = align_address(descsz, size / 8);
1077 const int note_type = 4;
1079 size_t notesz = 3 * (size / 8) + aligned_namesz + aligned_descsz;
1081 unsigned char buffer[128];
1082 gold_assert(sizeof buffer >= notesz);
1083 memset(buffer, 0, notesz);
1085 bool is_big_endian = parameters->is_big_endian();
1091 elfcpp::Swap<32, false>::writeval(buffer, namesz);
1092 elfcpp::Swap<32, false>::writeval(buffer + 4, descsz);
1093 elfcpp::Swap<32, false>::writeval(buffer + 8, note_type);
1097 elfcpp::Swap<32, true>::writeval(buffer, namesz);
1098 elfcpp::Swap<32, true>::writeval(buffer + 4, descsz);
1099 elfcpp::Swap<32, true>::writeval(buffer + 8, note_type);
1102 else if (size == 64)
1106 elfcpp::Swap<64, false>::writeval(buffer, namesz);
1107 elfcpp::Swap<64, false>::writeval(buffer + 8, descsz);
1108 elfcpp::Swap<64, false>::writeval(buffer + 16, note_type);
1112 elfcpp::Swap<64, true>::writeval(buffer, namesz);
1113 elfcpp::Swap<64, true>::writeval(buffer + 8, descsz);
1114 elfcpp::Swap<64, true>::writeval(buffer + 16, note_type);
1120 memcpy(buffer + 3 * (size / 8), name, namesz);
1121 memcpy(buffer + 3 * (size / 8) + aligned_namesz, desc.data(), descsz);
1123 const char* note_name = this->namepool_.add(".note", false, NULL);
1124 Output_section* os = this->make_output_section(note_name,
1127 Output_section_data* posd = new Output_data_const(buffer, notesz,
1129 os->add_output_section_data(posd);
1132 // Record whether the stack should be executable. This can be set
1133 // from the command line using the -z execstack or -z noexecstack
1134 // options. Otherwise, if any input file has a .note.GNU-stack
1135 // section with the SHF_EXECINSTR flag set, the stack should be
1136 // executable. Otherwise, if at least one input file a
1137 // .note.GNU-stack section, and some input file has no .note.GNU-stack
1138 // section, we use the target default for whether the stack should be
1139 // executable. Otherwise, we don't generate a stack note. When
1140 // generating a object file, we create a .note.GNU-stack section with
1141 // the appropriate marking. When generating an executable or shared
1142 // library, we create a PT_GNU_STACK segment.
1145 Layout::create_executable_stack_info(const Target* target)
1147 bool is_stack_executable;
1148 if (this->options_.is_execstack_set())
1149 is_stack_executable = this->options_.is_stack_executable();
1150 else if (!this->input_with_gnu_stack_note_)
1154 if (this->input_requires_executable_stack_)
1155 is_stack_executable = true;
1156 else if (this->input_without_gnu_stack_note_)
1157 is_stack_executable = target->is_default_stack_executable();
1159 is_stack_executable = false;
1162 if (parameters->output_is_object())
1164 const char* name = this->namepool_.add(".note.GNU-stack", false, NULL);
1165 elfcpp::Elf_Xword flags = 0;
1166 if (is_stack_executable)
1167 flags |= elfcpp::SHF_EXECINSTR;
1168 this->make_output_section(name, elfcpp::SHT_PROGBITS, flags);
1172 if (this->script_options_->saw_phdrs_clause())
1174 int flags = elfcpp::PF_R | elfcpp::PF_W;
1175 if (is_stack_executable)
1176 flags |= elfcpp::PF_X;
1177 this->make_output_segment(elfcpp::PT_GNU_STACK, flags);
1181 // Return whether SEG1 should be before SEG2 in the output file. This
1182 // is based entirely on the segment type and flags. When this is
1183 // called the segment addresses has normally not yet been set.
1186 Layout::segment_precedes(const Output_segment* seg1,
1187 const Output_segment* seg2)
1189 elfcpp::Elf_Word type1 = seg1->type();
1190 elfcpp::Elf_Word type2 = seg2->type();
1192 // The single PT_PHDR segment is required to precede any loadable
1193 // segment. We simply make it always first.
1194 if (type1 == elfcpp::PT_PHDR)
1196 gold_assert(type2 != elfcpp::PT_PHDR);
1199 if (type2 == elfcpp::PT_PHDR)
1202 // The single PT_INTERP segment is required to precede any loadable
1203 // segment. We simply make it always second.
1204 if (type1 == elfcpp::PT_INTERP)
1206 gold_assert(type2 != elfcpp::PT_INTERP);
1209 if (type2 == elfcpp::PT_INTERP)
1212 // We then put PT_LOAD segments before any other segments.
1213 if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD)
1215 if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD)
1218 // We put the PT_TLS segment last, because that is where the dynamic
1219 // linker expects to find it (this is just for efficiency; other
1220 // positions would also work correctly).
1221 if (type1 == elfcpp::PT_TLS && type2 != elfcpp::PT_TLS)
1223 if (type2 == elfcpp::PT_TLS && type1 != elfcpp::PT_TLS)
1226 const elfcpp::Elf_Word flags1 = seg1->flags();
1227 const elfcpp::Elf_Word flags2 = seg2->flags();
1229 // The order of non-PT_LOAD segments is unimportant. We simply sort
1230 // by the numeric segment type and flags values. There should not
1231 // be more than one segment with the same type and flags.
1232 if (type1 != elfcpp::PT_LOAD)
1235 return type1 < type2;
1236 gold_assert(flags1 != flags2);
1237 return flags1 < flags2;
1240 // If the addresses are set already, sort by load address.
1241 if (seg1->are_addresses_set())
1243 if (!seg2->are_addresses_set())
1246 unsigned int section_count1 = seg1->output_section_count();
1247 unsigned int section_count2 = seg2->output_section_count();
1248 if (section_count1 == 0 && section_count2 > 0)
1250 if (section_count1 > 0 && section_count2 == 0)
1253 uint64_t paddr1 = seg1->first_section_load_address();
1254 uint64_t paddr2 = seg2->first_section_load_address();
1255 if (paddr1 != paddr2)
1256 return paddr1 < paddr2;
1258 else if (seg2->are_addresses_set())
1261 // We sort PT_LOAD segments based on the flags. Readonly segments
1262 // come before writable segments. Then executable segments come
1263 // before non-executable segments. Then the unlikely case of a
1264 // non-readable segment comes before the normal case of a readable
1265 // segment. If there are multiple segments with the same type and
1266 // flags, we require that the address be set, and we sort by
1267 // virtual address and then physical address.
1268 if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W))
1269 return (flags1 & elfcpp::PF_W) == 0;
1270 if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X))
1271 return (flags1 & elfcpp::PF_X) != 0;
1272 if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R))
1273 return (flags1 & elfcpp::PF_R) == 0;
1275 // We shouldn't get here--we shouldn't create segments which we
1276 // can't distinguish.
1280 // Set the file offsets of all the segments, and all the sections they
1281 // contain. They have all been created. LOAD_SEG must be be laid out
1282 // first. Return the offset of the data to follow.
1285 Layout::set_segment_offsets(const Target* target, Output_segment* load_seg,
1286 unsigned int *pshndx)
1288 // Sort them into the final order.
1289 std::sort(this->segment_list_.begin(), this->segment_list_.end(),
1290 Layout::Compare_segments());
1292 // Find the PT_LOAD segments, and set their addresses and offsets
1293 // and their section's addresses and offsets.
1295 if (this->options_.user_set_text_segment_address())
1296 addr = options_.text_segment_address();
1297 else if (parameters->output_is_shared())
1300 addr = target->default_text_segment_address();
1303 // If LOAD_SEG is NULL, then the file header and segment headers
1304 // will not be loadable. But they still need to be at offset 0 in
1305 // the file. Set their offsets now.
1306 if (load_seg == NULL)
1308 for (Data_list::iterator p = this->special_output_list_.begin();
1309 p != this->special_output_list_.end();
1312 off = align_address(off, (*p)->addralign());
1313 (*p)->set_address_and_file_offset(0, off);
1314 off += (*p)->data_size();
1318 bool was_readonly = false;
1319 for (Segment_list::iterator p = this->segment_list_.begin();
1320 p != this->segment_list_.end();
1323 if ((*p)->type() == elfcpp::PT_LOAD)
1325 if (load_seg != NULL && load_seg != *p)
1329 uint64_t orig_addr = addr;
1330 uint64_t orig_off = off;
1332 uint64_t aligned_addr = 0;
1333 uint64_t abi_pagesize = target->abi_pagesize();
1335 // FIXME: This should depend on the -n and -N options.
1336 (*p)->set_minimum_p_align(target->common_pagesize());
1338 bool are_addresses_set = (*p)->are_addresses_set();
1339 if (are_addresses_set)
1341 // When it comes to setting file offsets, we care about
1342 // the physical address.
1343 addr = (*p)->paddr();
1345 // Adjust the file offset to the same address modulo the
1347 uint64_t unsigned_off = off;
1348 uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1))
1349 | (addr & (abi_pagesize - 1)));
1350 if (aligned_off < unsigned_off)
1351 aligned_off += abi_pagesize;
1356 // If the last segment was readonly, and this one is
1357 // not, then skip the address forward one page,
1358 // maintaining the same position within the page. This
1359 // lets us store both segments overlapping on a single
1360 // page in the file, but the loader will put them on
1361 // different pages in memory.
1363 addr = align_address(addr, (*p)->maximum_alignment());
1364 aligned_addr = addr;
1366 if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0)
1368 if ((addr & (abi_pagesize - 1)) != 0)
1369 addr = addr + abi_pagesize;
1372 off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
1375 unsigned int shndx_hold = *pshndx;
1376 uint64_t new_addr = (*p)->set_section_addresses(false, addr, &off,
1379 // Now that we know the size of this segment, we may be able
1380 // to save a page in memory, at the cost of wasting some
1381 // file space, by instead aligning to the start of a new
1382 // page. Here we use the real machine page size rather than
1383 // the ABI mandated page size.
1385 if (!are_addresses_set && aligned_addr != addr)
1387 uint64_t common_pagesize = target->common_pagesize();
1388 uint64_t first_off = (common_pagesize
1390 & (common_pagesize - 1)));
1391 uint64_t last_off = new_addr & (common_pagesize - 1);
1394 && ((aligned_addr & ~ (common_pagesize - 1))
1395 != (new_addr & ~ (common_pagesize - 1)))
1396 && first_off + last_off <= common_pagesize)
1398 *pshndx = shndx_hold;
1399 addr = align_address(aligned_addr, common_pagesize);
1400 addr = align_address(addr, (*p)->maximum_alignment());
1401 off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
1402 new_addr = (*p)->set_section_addresses(true, addr, &off,
1409 if (((*p)->flags() & elfcpp::PF_W) == 0)
1410 was_readonly = true;
1414 // Handle the non-PT_LOAD segments, setting their offsets from their
1415 // section's offsets.
1416 for (Segment_list::iterator p = this->segment_list_.begin();
1417 p != this->segment_list_.end();
1420 if ((*p)->type() != elfcpp::PT_LOAD)
1424 // Set the TLS offsets for each section in the PT_TLS segment.
1425 if (this->tls_segment_ != NULL)
1426 this->tls_segment_->set_tls_offsets();
1431 // Set the offsets of all the allocated sections when doing a
1432 // relocatable link. This does the same jobs as set_segment_offsets,
1433 // only for a relocatable link.
1436 Layout::set_relocatable_section_offsets(Output_data* file_header,
1437 unsigned int *pshndx)
1441 file_header->set_address_and_file_offset(0, 0);
1442 off += file_header->data_size();
1444 for (Section_list::iterator p = this->section_list_.begin();
1445 p != this->section_list_.end();
1448 // We skip unallocated sections here, except that group sections
1449 // have to come first.
1450 if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0
1451 && (*p)->type() != elfcpp::SHT_GROUP)
1454 off = align_address(off, (*p)->addralign());
1456 // The linker script might have set the address.
1457 if (!(*p)->is_address_valid())
1458 (*p)->set_address(0);
1459 (*p)->set_file_offset(off);
1460 (*p)->finalize_data_size();
1461 off += (*p)->data_size();
1463 (*p)->set_out_shndx(*pshndx);
1470 // Set the file offset of all the sections not associated with a
1474 Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass)
1476 for (Section_list::iterator p = this->unattached_section_list_.begin();
1477 p != this->unattached_section_list_.end();
1480 // The symtab section is handled in create_symtab_sections.
1481 if (*p == this->symtab_section_)
1484 // If we've already set the data size, don't set it again.
1485 if ((*p)->is_offset_valid() && (*p)->is_data_size_valid())
1488 if (pass == BEFORE_INPUT_SECTIONS_PASS
1489 && (*p)->requires_postprocessing())
1491 (*p)->create_postprocessing_buffer();
1492 this->any_postprocessing_sections_ = true;
1495 if (pass == BEFORE_INPUT_SECTIONS_PASS
1496 && (*p)->after_input_sections())
1498 else if (pass == POSTPROCESSING_SECTIONS_PASS
1499 && (!(*p)->after_input_sections()
1500 || (*p)->type() == elfcpp::SHT_STRTAB))
1502 else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
1503 && (!(*p)->after_input_sections()
1504 || (*p)->type() != elfcpp::SHT_STRTAB))
1507 off = align_address(off, (*p)->addralign());
1508 (*p)->set_file_offset(off);
1509 (*p)->finalize_data_size();
1510 off += (*p)->data_size();
1512 // At this point the name must be set.
1513 if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS)
1514 this->namepool_.add((*p)->name(), false, NULL);
1519 // Set the section indexes of all the sections not associated with a
1523 Layout::set_section_indexes(unsigned int shndx)
1525 const bool output_is_object = parameters->output_is_object();
1526 for (Section_list::iterator p = this->unattached_section_list_.begin();
1527 p != this->unattached_section_list_.end();
1530 // In a relocatable link, we already did group sections.
1531 if (output_is_object
1532 && (*p)->type() == elfcpp::SHT_GROUP)
1535 (*p)->set_out_shndx(shndx);
1541 // Set the section addresses according to the linker script. This is
1542 // only called when we see a SECTIONS clause. This returns the
1543 // program segment which should hold the file header and segment
1544 // headers, if any. It will return NULL if they should not be in a
1548 Layout::set_section_addresses_from_script(Symbol_table* symtab)
1550 Script_sections* ss = this->script_options_->script_sections();
1551 gold_assert(ss->saw_sections_clause());
1553 // Place each orphaned output section in the script.
1554 for (Section_list::iterator p = this->section_list_.begin();
1555 p != this->section_list_.end();
1558 if (!(*p)->found_in_sections_clause())
1559 ss->place_orphan(*p);
1562 return this->script_options_->set_section_addresses(symtab, this);
1565 // Count the local symbols in the regular symbol table and the dynamic
1566 // symbol table, and build the respective string pools.
1569 Layout::count_local_symbols(const Task* task,
1570 const Input_objects* input_objects)
1572 // First, figure out an upper bound on the number of symbols we'll
1573 // be inserting into each pool. This helps us create the pools with
1574 // the right size, to avoid unnecessary hashtable resizing.
1575 unsigned int symbol_count = 0;
1576 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
1577 p != input_objects->relobj_end();
1579 symbol_count += (*p)->local_symbol_count();
1581 // Go from "upper bound" to "estimate." We overcount for two
1582 // reasons: we double-count symbols that occur in more than one
1583 // object file, and we count symbols that are dropped from the
1584 // output. Add it all together and assume we overcount by 100%.
1587 // We assume all symbols will go into both the sympool and dynpool.
1588 this->sympool_.reserve(symbol_count);
1589 this->dynpool_.reserve(symbol_count);
1591 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
1592 p != input_objects->relobj_end();
1595 Task_lock_obj<Object> tlo(task, *p);
1596 (*p)->count_local_symbols(&this->sympool_, &this->dynpool_);
1600 // Create the symbol table sections. Here we also set the final
1601 // values of the symbols. At this point all the loadable sections are
1605 Layout::create_symtab_sections(const Input_objects* input_objects,
1606 Symbol_table* symtab,
1611 if (parameters->get_size() == 32)
1613 symsize = elfcpp::Elf_sizes<32>::sym_size;
1616 else if (parameters->get_size() == 64)
1618 symsize = elfcpp::Elf_sizes<64>::sym_size;
1625 off = align_address(off, align);
1626 off_t startoff = off;
1628 // Save space for the dummy symbol at the start of the section. We
1629 // never bother to write this out--it will just be left as zero.
1631 unsigned int local_symbol_index = 1;
1633 // Add STT_SECTION symbols for each Output section which needs one.
1634 for (Section_list::iterator p = this->section_list_.begin();
1635 p != this->section_list_.end();
1638 if (!(*p)->needs_symtab_index())
1639 (*p)->set_symtab_index(-1U);
1642 (*p)->set_symtab_index(local_symbol_index);
1643 ++local_symbol_index;
1648 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
1649 p != input_objects->relobj_end();
1652 unsigned int index = (*p)->finalize_local_symbols(local_symbol_index,
1654 off += (index - local_symbol_index) * symsize;
1655 local_symbol_index = index;
1658 unsigned int local_symcount = local_symbol_index;
1659 gold_assert(local_symcount * symsize == off - startoff);
1662 size_t dyn_global_index;
1664 if (this->dynsym_section_ == NULL)
1667 dyn_global_index = 0;
1672 dyn_global_index = this->dynsym_section_->info();
1673 off_t locsize = dyn_global_index * this->dynsym_section_->entsize();
1674 dynoff = this->dynsym_section_->offset() + locsize;
1675 dyncount = (this->dynsym_section_->data_size() - locsize) / symsize;
1676 gold_assert(static_cast<off_t>(dyncount * symsize)
1677 == this->dynsym_section_->data_size() - locsize);
1680 off = symtab->finalize(off, dynoff, dyn_global_index, dyncount,
1681 &this->sympool_, &local_symcount);
1683 if (!parameters->strip_all())
1685 this->sympool_.set_string_offsets();
1687 const char* symtab_name = this->namepool_.add(".symtab", false, NULL);
1688 Output_section* osymtab = this->make_output_section(symtab_name,
1691 this->symtab_section_ = osymtab;
1693 Output_section_data* pos = new Output_data_fixed_space(off - startoff,
1695 osymtab->add_output_section_data(pos);
1697 const char* strtab_name = this->namepool_.add(".strtab", false, NULL);
1698 Output_section* ostrtab = this->make_output_section(strtab_name,
1702 Output_section_data* pstr = new Output_data_strtab(&this->sympool_);
1703 ostrtab->add_output_section_data(pstr);
1705 osymtab->set_file_offset(startoff);
1706 osymtab->finalize_data_size();
1707 osymtab->set_link_section(ostrtab);
1708 osymtab->set_info(local_symcount);
1709 osymtab->set_entsize(symsize);
1715 // Create the .shstrtab section, which holds the names of the
1716 // sections. At the time this is called, we have created all the
1717 // output sections except .shstrtab itself.
1720 Layout::create_shstrtab()
1722 // FIXME: We don't need to create a .shstrtab section if we are
1723 // stripping everything.
1725 const char* name = this->namepool_.add(".shstrtab", false, NULL);
1727 Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0);
1729 // We can't write out this section until we've set all the section
1730 // names, and we don't set the names of compressed output sections
1731 // until relocations are complete.
1732 os->set_after_input_sections();
1734 Output_section_data* posd = new Output_data_strtab(&this->namepool_);
1735 os->add_output_section_data(posd);
1740 // Create the section headers. SIZE is 32 or 64. OFF is the file
1744 Layout::create_shdrs(off_t* poff)
1746 Output_section_headers* oshdrs;
1747 oshdrs = new Output_section_headers(this,
1748 &this->segment_list_,
1749 &this->section_list_,
1750 &this->unattached_section_list_,
1752 off_t off = align_address(*poff, oshdrs->addralign());
1753 oshdrs->set_address_and_file_offset(0, off);
1754 off += oshdrs->data_size();
1756 this->section_headers_ = oshdrs;
1759 // Create the dynamic symbol table.
1762 Layout::create_dynamic_symtab(const Input_objects* input_objects,
1763 Symbol_table* symtab,
1764 Output_section **pdynstr,
1765 unsigned int* plocal_dynamic_count,
1766 std::vector<Symbol*>* pdynamic_symbols,
1767 Versions* pversions)
1769 // Count all the symbols in the dynamic symbol table, and set the
1770 // dynamic symbol indexes.
1772 // Skip symbol 0, which is always all zeroes.
1773 unsigned int index = 1;
1775 // Add STT_SECTION symbols for each Output section which needs one.
1776 for (Section_list::iterator p = this->section_list_.begin();
1777 p != this->section_list_.end();
1780 if (!(*p)->needs_dynsym_index())
1781 (*p)->set_dynsym_index(-1U);
1784 (*p)->set_dynsym_index(index);
1789 // Count the local symbols that need to go in the dynamic symbol table,
1790 // and set the dynamic symbol indexes.
1791 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
1792 p != input_objects->relobj_end();
1795 unsigned int new_index = (*p)->set_local_dynsym_indexes(index);
1799 unsigned int local_symcount = index;
1800 *plocal_dynamic_count = local_symcount;
1802 // FIXME: We have to tell set_dynsym_indexes whether the
1803 // -E/--export-dynamic option was used.
1804 index = symtab->set_dynsym_indexes(index, pdynamic_symbols,
1805 &this->dynpool_, pversions);
1809 const int size = parameters->get_size();
1812 symsize = elfcpp::Elf_sizes<32>::sym_size;
1815 else if (size == 64)
1817 symsize = elfcpp::Elf_sizes<64>::sym_size;
1823 // Create the dynamic symbol table section.
1825 Output_section* dynsym = this->choose_output_section(NULL, ".dynsym",
1830 Output_section_data* odata = new Output_data_fixed_space(index * symsize,
1832 dynsym->add_output_section_data(odata);
1834 dynsym->set_info(local_symcount);
1835 dynsym->set_entsize(symsize);
1836 dynsym->set_addralign(align);
1838 this->dynsym_section_ = dynsym;
1840 Output_data_dynamic* const odyn = this->dynamic_data_;
1841 odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym);
1842 odyn->add_constant(elfcpp::DT_SYMENT, symsize);
1844 // Create the dynamic string table section.
1846 Output_section* dynstr = this->choose_output_section(NULL, ".dynstr",
1851 Output_section_data* strdata = new Output_data_strtab(&this->dynpool_);
1852 dynstr->add_output_section_data(strdata);
1854 dynsym->set_link_section(dynstr);
1855 this->dynamic_section_->set_link_section(dynstr);
1857 odyn->add_section_address(elfcpp::DT_STRTAB, dynstr);
1858 odyn->add_section_size(elfcpp::DT_STRSZ, dynstr);
1862 // Create the hash tables.
1864 // FIXME: We need an option to create a GNU hash table.
1866 unsigned char* phash;
1867 unsigned int hashlen;
1868 Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount,
1871 Output_section* hashsec = this->choose_output_section(NULL, ".hash",
1876 Output_section_data* hashdata = new Output_data_const_buffer(phash,
1879 hashsec->add_output_section_data(hashdata);
1881 hashsec->set_link_section(dynsym);
1882 hashsec->set_entsize(4);
1884 odyn->add_section_address(elfcpp::DT_HASH, hashsec);
1887 // Assign offsets to each local portion of the dynamic symbol table.
1890 Layout::assign_local_dynsym_offsets(const Input_objects* input_objects)
1892 Output_section* dynsym = this->dynsym_section_;
1893 gold_assert(dynsym != NULL);
1895 off_t off = dynsym->offset();
1897 // Skip the dummy symbol at the start of the section.
1898 off += dynsym->entsize();
1900 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
1901 p != input_objects->relobj_end();
1904 unsigned int count = (*p)->set_local_dynsym_offset(off);
1905 off += count * dynsym->entsize();
1909 // Create the version sections.
1912 Layout::create_version_sections(const Versions* versions,
1913 const Symbol_table* symtab,
1914 unsigned int local_symcount,
1915 const std::vector<Symbol*>& dynamic_symbols,
1916 const Output_section* dynstr)
1918 if (!versions->any_defs() && !versions->any_needs())
1921 if (parameters->get_size() == 32)
1923 if (parameters->is_big_endian())
1925 #ifdef HAVE_TARGET_32_BIG
1926 this->sized_create_version_sections
1927 SELECT_SIZE_ENDIAN_NAME(32, true)(
1928 versions, symtab, local_symcount, dynamic_symbols, dynstr
1929 SELECT_SIZE_ENDIAN(32, true));
1936 #ifdef HAVE_TARGET_32_LITTLE
1937 this->sized_create_version_sections
1938 SELECT_SIZE_ENDIAN_NAME(32, false)(
1939 versions, symtab, local_symcount, dynamic_symbols, dynstr
1940 SELECT_SIZE_ENDIAN(32, false));
1946 else if (parameters->get_size() == 64)
1948 if (parameters->is_big_endian())
1950 #ifdef HAVE_TARGET_64_BIG
1951 this->sized_create_version_sections
1952 SELECT_SIZE_ENDIAN_NAME(64, true)(
1953 versions, symtab, local_symcount, dynamic_symbols, dynstr
1954 SELECT_SIZE_ENDIAN(64, true));
1961 #ifdef HAVE_TARGET_64_LITTLE
1962 this->sized_create_version_sections
1963 SELECT_SIZE_ENDIAN_NAME(64, false)(
1964 versions, symtab, local_symcount, dynamic_symbols, dynstr
1965 SELECT_SIZE_ENDIAN(64, false));
1975 // Create the version sections, sized version.
1977 template<int size, bool big_endian>
1979 Layout::sized_create_version_sections(
1980 const Versions* versions,
1981 const Symbol_table* symtab,
1982 unsigned int local_symcount,
1983 const std::vector<Symbol*>& dynamic_symbols,
1984 const Output_section* dynstr
1987 Output_section* vsec = this->choose_output_section(NULL, ".gnu.version",
1988 elfcpp::SHT_GNU_versym,
1992 unsigned char* vbuf;
1994 versions->symbol_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
1995 symtab, &this->dynpool_, local_symcount, dynamic_symbols, &vbuf, &vsize
1996 SELECT_SIZE_ENDIAN(size, big_endian));
1998 Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2);
2000 vsec->add_output_section_data(vdata);
2001 vsec->set_entsize(2);
2002 vsec->set_link_section(this->dynsym_section_);
2004 Output_data_dynamic* const odyn = this->dynamic_data_;
2005 odyn->add_section_address(elfcpp::DT_VERSYM, vsec);
2007 if (versions->any_defs())
2009 Output_section* vdsec;
2010 vdsec= this->choose_output_section(NULL, ".gnu.version_d",
2011 elfcpp::SHT_GNU_verdef,
2015 unsigned char* vdbuf;
2016 unsigned int vdsize;
2017 unsigned int vdentries;
2018 versions->def_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
2019 &this->dynpool_, &vdbuf, &vdsize, &vdentries
2020 SELECT_SIZE_ENDIAN(size, big_endian));
2022 Output_section_data* vddata = new Output_data_const_buffer(vdbuf,
2026 vdsec->add_output_section_data(vddata);
2027 vdsec->set_link_section(dynstr);
2028 vdsec->set_info(vdentries);
2030 odyn->add_section_address(elfcpp::DT_VERDEF, vdsec);
2031 odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries);
2034 if (versions->any_needs())
2036 Output_section* vnsec;
2037 vnsec = this->choose_output_section(NULL, ".gnu.version_r",
2038 elfcpp::SHT_GNU_verneed,
2042 unsigned char* vnbuf;
2043 unsigned int vnsize;
2044 unsigned int vnentries;
2045 versions->need_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)
2046 (&this->dynpool_, &vnbuf, &vnsize, &vnentries
2047 SELECT_SIZE_ENDIAN(size, big_endian));
2049 Output_section_data* vndata = new Output_data_const_buffer(vnbuf,
2053 vnsec->add_output_section_data(vndata);
2054 vnsec->set_link_section(dynstr);
2055 vnsec->set_info(vnentries);
2057 odyn->add_section_address(elfcpp::DT_VERNEED, vnsec);
2058 odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries);
2062 // Create the .interp section and PT_INTERP segment.
2065 Layout::create_interp(const Target* target)
2067 const char* interp = this->options_.dynamic_linker();
2070 interp = target->dynamic_linker();
2071 gold_assert(interp != NULL);
2074 size_t len = strlen(interp) + 1;
2076 Output_section_data* odata = new Output_data_const(interp, len, 1);
2078 Output_section* osec = this->choose_output_section(NULL, ".interp",
2079 elfcpp::SHT_PROGBITS,
2082 osec->add_output_section_data(odata);
2084 if (!this->script_options_->saw_phdrs_clause())
2086 Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP,
2088 oseg->add_initial_output_section(osec, elfcpp::PF_R);
2092 // Finish the .dynamic section and PT_DYNAMIC segment.
2095 Layout::finish_dynamic_section(const Input_objects* input_objects,
2096 const Symbol_table* symtab)
2098 if (!this->script_options_->saw_phdrs_clause())
2100 Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC,
2103 oseg->add_initial_output_section(this->dynamic_section_,
2104 elfcpp::PF_R | elfcpp::PF_W);
2107 Output_data_dynamic* const odyn = this->dynamic_data_;
2109 for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin();
2110 p != input_objects->dynobj_end();
2113 // FIXME: Handle --as-needed.
2114 odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname());
2117 if (parameters->output_is_shared())
2119 const char* soname = this->options_.soname();
2121 odyn->add_string(elfcpp::DT_SONAME, soname);
2124 // FIXME: Support --init and --fini.
2125 Symbol* sym = symtab->lookup("_init");
2126 if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())
2127 odyn->add_symbol(elfcpp::DT_INIT, sym);
2129 sym = symtab->lookup("_fini");
2130 if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj())
2131 odyn->add_symbol(elfcpp::DT_FINI, sym);
2133 // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY.
2135 // Add a DT_RPATH entry if needed.
2136 const General_options::Dir_list& rpath(this->options_.rpath());
2139 std::string rpath_val;
2140 for (General_options::Dir_list::const_iterator p = rpath.begin();
2144 if (rpath_val.empty())
2145 rpath_val = p->name();
2148 // Eliminate duplicates.
2149 General_options::Dir_list::const_iterator q;
2150 for (q = rpath.begin(); q != p; ++q)
2151 if (q->name() == p->name())
2156 rpath_val += p->name();
2161 odyn->add_string(elfcpp::DT_RPATH, rpath_val);
2164 // Look for text segments that have dynamic relocations.
2165 bool have_textrel = false;
2166 for (Segment_list::const_iterator p = this->segment_list_.begin();
2167 p != this->segment_list_.end();
2170 if (((*p)->flags() & elfcpp::PF_W) == 0
2171 && (*p)->dynamic_reloc_count() > 0)
2173 have_textrel = true;
2178 // Add a DT_FLAGS entry. We add it even if no flags are set so that
2179 // post-link tools can easily modify these flags if desired.
2180 unsigned int flags = 0;
2183 // Add a DT_TEXTREL for compatibility with older loaders.
2184 odyn->add_constant(elfcpp::DT_TEXTREL, 0);
2185 flags |= elfcpp::DF_TEXTREL;
2187 if (parameters->output_is_shared() && this->has_static_tls())
2188 flags |= elfcpp::DF_STATIC_TLS;
2189 odyn->add_constant(elfcpp::DT_FLAGS, flags);
2192 // The mapping of .gnu.linkonce section names to real section names.
2194 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
2195 const Layout::Linkonce_mapping Layout::linkonce_mapping[] =
2197 MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
2198 MAPPING_INIT("t", ".text"),
2199 MAPPING_INIT("r", ".rodata"),
2200 MAPPING_INIT("d", ".data"),
2201 MAPPING_INIT("b", ".bss"),
2202 MAPPING_INIT("s", ".sdata"),
2203 MAPPING_INIT("sb", ".sbss"),
2204 MAPPING_INIT("s2", ".sdata2"),
2205 MAPPING_INIT("sb2", ".sbss2"),
2206 MAPPING_INIT("wi", ".debug_info"),
2207 MAPPING_INIT("td", ".tdata"),
2208 MAPPING_INIT("tb", ".tbss"),
2209 MAPPING_INIT("lr", ".lrodata"),
2210 MAPPING_INIT("l", ".ldata"),
2211 MAPPING_INIT("lb", ".lbss"),
2215 const int Layout::linkonce_mapping_count =
2216 sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]);
2218 // Return the name of the output section to use for a .gnu.linkonce
2219 // section. This is based on the default ELF linker script of the old
2220 // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
2221 // to ".text". Set *PLEN to the length of the name. *PLEN is
2222 // initialized to the length of NAME.
2225 Layout::linkonce_output_name(const char* name, size_t *plen)
2227 const char* s = name + sizeof(".gnu.linkonce") - 1;
2231 const Linkonce_mapping* plm = linkonce_mapping;
2232 for (int i = 0; i < linkonce_mapping_count; ++i, ++plm)
2234 if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.')
2243 // Choose the output section name to use given an input section name.
2244 // Set *PLEN to the length of the name. *PLEN is initialized to the
2248 Layout::output_section_name(const char* name, size_t* plen)
2250 if (Layout::is_linkonce(name))
2252 // .gnu.linkonce sections are laid out as though they were named
2253 // for the sections are placed into.
2254 return Layout::linkonce_output_name(name, plen);
2257 // gcc 4.3 generates the following sorts of section names when it
2258 // needs a section name specific to a function:
2264 // .data.rel.local.FN
2266 // .data.rel.ro.local.FN
2273 // The GNU linker maps all of those to the part before the .FN,
2274 // except that .data.rel.local.FN is mapped to .data, and
2275 // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections
2276 // beginning with .data.rel.ro.local are grouped together.
2278 // For an anonymous namespace, the string FN can contain a '.'.
2280 // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the
2281 // GNU linker maps to .rodata.
2283 // The .data.rel.ro sections enable a security feature triggered by
2284 // the -z relro option. Section which need to be relocated at
2285 // program startup time but which may be readonly after startup are
2286 // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO
2287 // segment. The dynamic linker will make that segment writable,
2288 // perform relocations, and then make it read-only. FIXME: We do
2289 // not yet implement this optimization.
2291 // It is hard to handle this in a principled way.
2293 // These are the rules we follow:
2295 // If the section name has no initial '.', or no dot other than an
2296 // initial '.', we use the name unchanged (i.e., "mysection" and
2297 // ".text" are unchanged).
2299 // If the name starts with ".data.rel.ro" we use ".data.rel.ro".
2301 // Otherwise, we drop the second '.' and everything that comes after
2302 // it (i.e., ".text.XXX" becomes ".text").
2304 const char* s = name;
2308 const char* sdot = strchr(s, '.');
2312 const char* const data_rel_ro = ".data.rel.ro";
2313 if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0)
2315 *plen = strlen(data_rel_ro);
2319 *plen = sdot - name;
2323 // Record the signature of a comdat section, and return whether to
2324 // include it in the link. If GROUP is true, this is a regular
2325 // section group. If GROUP is false, this is a group signature
2326 // derived from the name of a linkonce section. We want linkonce
2327 // signatures and group signatures to block each other, but we don't
2328 // want a linkonce signature to block another linkonce signature.
2331 Layout::add_comdat(const char* signature, bool group)
2333 std::string sig(signature);
2334 std::pair<Signatures::iterator, bool> ins(
2335 this->signatures_.insert(std::make_pair(sig, group)));
2339 // This is the first time we've seen this signature.
2343 if (ins.first->second)
2345 // We've already seen a real section group with this signature.
2350 // This is a real section group, and we've already seen a
2351 // linkonce section with this signature. Record that we've seen
2352 // a section group, and don't include this section group.
2353 ins.first->second = true;
2358 // We've already seen a linkonce section and this is a linkonce
2359 // section. These don't block each other--this may be the same
2360 // symbol name with different section types.
2365 // Store the allocated sections into the section list.
2368 Layout::get_allocated_sections(Section_list* section_list) const
2370 for (Section_list::const_iterator p = this->section_list_.begin();
2371 p != this->section_list_.end();
2373 if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0)
2374 section_list->push_back(*p);
2377 // Create an output segment.
2380 Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
2382 gold_assert(!parameters->output_is_object());
2383 Output_segment* oseg = new Output_segment(type, flags);
2384 this->segment_list_.push_back(oseg);
2388 // Write out the Output_sections. Most won't have anything to write,
2389 // since most of the data will come from input sections which are
2390 // handled elsewhere. But some Output_sections do have Output_data.
2393 Layout::write_output_sections(Output_file* of) const
2395 for (Section_list::const_iterator p = this->section_list_.begin();
2396 p != this->section_list_.end();
2399 if (!(*p)->after_input_sections())
2404 // Write out data not associated with a section or the symbol table.
2407 Layout::write_data(const Symbol_table* symtab, Output_file* of) const
2409 if (!parameters->strip_all())
2411 const Output_section* symtab_section = this->symtab_section_;
2412 for (Section_list::const_iterator p = this->section_list_.begin();
2413 p != this->section_list_.end();
2416 if ((*p)->needs_symtab_index())
2418 gold_assert(symtab_section != NULL);
2419 unsigned int index = (*p)->symtab_index();
2420 gold_assert(index > 0 && index != -1U);
2421 off_t off = (symtab_section->offset()
2422 + index * symtab_section->entsize());
2423 symtab->write_section_symbol(*p, of, off);
2428 const Output_section* dynsym_section = this->dynsym_section_;
2429 for (Section_list::const_iterator p = this->section_list_.begin();
2430 p != this->section_list_.end();
2433 if ((*p)->needs_dynsym_index())
2435 gold_assert(dynsym_section != NULL);
2436 unsigned int index = (*p)->dynsym_index();
2437 gold_assert(index > 0 && index != -1U);
2438 off_t off = (dynsym_section->offset()
2439 + index * dynsym_section->entsize());
2440 symtab->write_section_symbol(*p, of, off);
2444 // Write out the Output_data which are not in an Output_section.
2445 for (Data_list::const_iterator p = this->special_output_list_.begin();
2446 p != this->special_output_list_.end();
2451 // Write out the Output_sections which can only be written after the
2452 // input sections are complete.
2455 Layout::write_sections_after_input_sections(Output_file* of)
2457 // Determine the final section offsets, and thus the final output
2458 // file size. Note we finalize the .shstrab last, to allow the
2459 // after_input_section sections to modify their section-names before
2461 if (this->any_postprocessing_sections_)
2463 off_t off = this->output_file_size_;
2464 off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS);
2466 // Now that we've finalized the names, we can finalize the shstrab.
2468 this->set_section_offsets(off,
2469 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS);
2471 if (off > this->output_file_size_)
2474 this->output_file_size_ = off;
2478 for (Section_list::const_iterator p = this->section_list_.begin();
2479 p != this->section_list_.end();
2482 if ((*p)->after_input_sections())
2486 this->section_headers_->write(of);
2489 // Print statistical information to stderr. This is used for --stats.
2492 Layout::print_stats() const
2494 this->namepool_.print_stats("section name pool");
2495 this->sympool_.print_stats("output symbol name pool");
2496 this->dynpool_.print_stats("dynamic name pool");
2498 for (Section_list::const_iterator p = this->section_list_.begin();
2499 p != this->section_list_.end();
2501 (*p)->print_merge_stats();
2504 // Write_sections_task methods.
2506 // We can always run this task.
2509 Write_sections_task::is_runnable()
2514 // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER
2518 Write_sections_task::locks(Task_locker* tl)
2520 tl->add(this, this->output_sections_blocker_);
2521 tl->add(this, this->final_blocker_);
2524 // Run the task--write out the data.
2527 Write_sections_task::run(Workqueue*)
2529 this->layout_->write_output_sections(this->of_);
2532 // Write_data_task methods.
2534 // We can always run this task.
2537 Write_data_task::is_runnable()
2542 // We need to unlock FINAL_BLOCKER when finished.
2545 Write_data_task::locks(Task_locker* tl)
2547 tl->add(this, this->final_blocker_);
2550 // Run the task--write out the data.
2553 Write_data_task::run(Workqueue*)
2555 this->layout_->write_data(this->symtab_, this->of_);
2558 // Write_symbols_task methods.
2560 // We can always run this task.
2563 Write_symbols_task::is_runnable()
2568 // We need to unlock FINAL_BLOCKER when finished.
2571 Write_symbols_task::locks(Task_locker* tl)
2573 tl->add(this, this->final_blocker_);
2576 // Run the task--write out the symbols.
2579 Write_symbols_task::run(Workqueue*)
2581 this->symtab_->write_globals(this->input_objects_, this->sympool_,
2582 this->dynpool_, this->of_);
2585 // Write_after_input_sections_task methods.
2587 // We can only run this task after the input sections have completed.
2590 Write_after_input_sections_task::is_runnable()
2592 if (this->input_sections_blocker_->is_blocked())
2593 return this->input_sections_blocker_;
2597 // We need to unlock FINAL_BLOCKER when finished.
2600 Write_after_input_sections_task::locks(Task_locker* tl)
2602 tl->add(this, this->final_blocker_);
2608 Write_after_input_sections_task::run(Workqueue*)
2610 this->layout_->write_sections_after_input_sections(this->of_);
2613 // Close_task_runner methods.
2615 // Run the task--close the file.
2618 Close_task_runner::run(Workqueue*, const Task*)
2623 // Instantiate the templates we need. We could use the configure
2624 // script to restrict this to only the ones for implemented targets.
2626 #ifdef HAVE_TARGET_32_LITTLE
2629 Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx,
2631 const elfcpp::Shdr<32, false>& shdr,
2632 unsigned int, unsigned int, off_t*);
2635 #ifdef HAVE_TARGET_32_BIG
2638 Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx,
2640 const elfcpp::Shdr<32, true>& shdr,
2641 unsigned int, unsigned int, off_t*);
2644 #ifdef HAVE_TARGET_64_LITTLE
2647 Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx,
2649 const elfcpp::Shdr<64, false>& shdr,
2650 unsigned int, unsigned int, off_t*);
2653 #ifdef HAVE_TARGET_64_BIG
2656 Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx,
2658 const elfcpp::Shdr<64, true>& shdr,
2659 unsigned int, unsigned int, off_t*);
2662 #ifdef HAVE_TARGET_32_LITTLE
2665 Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object,
2666 unsigned int reloc_shndx,
2667 const elfcpp::Shdr<32, false>& shdr,
2668 Output_section* data_section,
2669 Relocatable_relocs* rr);
2672 #ifdef HAVE_TARGET_32_BIG
2675 Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object,
2676 unsigned int reloc_shndx,
2677 const elfcpp::Shdr<32, true>& shdr,
2678 Output_section* data_section,
2679 Relocatable_relocs* rr);
2682 #ifdef HAVE_TARGET_64_LITTLE
2685 Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object,
2686 unsigned int reloc_shndx,
2687 const elfcpp::Shdr<64, false>& shdr,
2688 Output_section* data_section,
2689 Relocatable_relocs* rr);
2692 #ifdef HAVE_TARGET_64_BIG
2695 Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object,
2696 unsigned int reloc_shndx,
2697 const elfcpp::Shdr<64, true>& shdr,
2698 Output_section* data_section,
2699 Relocatable_relocs* rr);
2702 #ifdef HAVE_TARGET_32_LITTLE
2705 Layout::layout_group<32, false>(Symbol_table* symtab,
2706 Sized_relobj<32, false>* object,
2708 const char* group_section_name,
2709 const char* signature,
2710 const elfcpp::Shdr<32, false>& shdr,
2711 const elfcpp::Elf_Word* contents);
2714 #ifdef HAVE_TARGET_32_BIG
2717 Layout::layout_group<32, true>(Symbol_table* symtab,
2718 Sized_relobj<32, true>* object,
2720 const char* group_section_name,
2721 const char* signature,
2722 const elfcpp::Shdr<32, true>& shdr,
2723 const elfcpp::Elf_Word* contents);
2726 #ifdef HAVE_TARGET_64_LITTLE
2729 Layout::layout_group<64, false>(Symbol_table* symtab,
2730 Sized_relobj<64, false>* object,
2732 const char* group_section_name,
2733 const char* signature,
2734 const elfcpp::Shdr<64, false>& shdr,
2735 const elfcpp::Elf_Word* contents);
2738 #ifdef HAVE_TARGET_64_BIG
2741 Layout::layout_group<64, true>(Symbol_table* symtab,
2742 Sized_relobj<64, true>* object,
2744 const char* group_section_name,
2745 const char* signature,
2746 const elfcpp::Shdr<64, true>& shdr,
2747 const elfcpp::Elf_Word* contents);
2750 #ifdef HAVE_TARGET_32_LITTLE
2753 Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object,
2754 const unsigned char* symbols,
2756 const unsigned char* symbol_names,
2757 off_t symbol_names_size,
2759 const elfcpp::Shdr<32, false>& shdr,
2760 unsigned int reloc_shndx,
2761 unsigned int reloc_type,
2765 #ifdef HAVE_TARGET_32_BIG
2768 Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object,
2769 const unsigned char* symbols,
2771 const unsigned char* symbol_names,
2772 off_t symbol_names_size,
2774 const elfcpp::Shdr<32, true>& shdr,
2775 unsigned int reloc_shndx,
2776 unsigned int reloc_type,
2780 #ifdef HAVE_TARGET_64_LITTLE
2783 Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object,
2784 const unsigned char* symbols,
2786 const unsigned char* symbol_names,
2787 off_t symbol_names_size,
2789 const elfcpp::Shdr<64, false>& shdr,
2790 unsigned int reloc_shndx,
2791 unsigned int reloc_type,
2795 #ifdef HAVE_TARGET_64_BIG
2798 Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object,
2799 const unsigned char* symbols,
2801 const unsigned char* symbol_names,
2802 off_t symbol_names_size,
2804 const elfcpp::Shdr<64, true>& shdr,
2805 unsigned int reloc_shndx,
2806 unsigned int reloc_type,
2810 } // End namespace gold.