1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright (C) 2006-2015 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 "reloc-types.h"
37 class General_options;
41 class Output_merge_base;
43 class Relocatable_relocs;
45 template<int size, bool big_endian>
47 template<int size, bool big_endian>
49 template<int size, bool big_endian>
50 class Sized_relobj_file;
52 // An abtract class for data which has to go into the output file.
57 explicit Output_data()
58 : address_(0), data_size_(0), offset_(-1),
59 is_address_valid_(false), is_data_size_valid_(false),
60 is_offset_valid_(false), is_data_size_fixed_(false),
61 has_dynamic_reloc_(false)
67 // Return the address. For allocated sections, this is only valid
68 // after Layout::finalize is finished.
72 gold_assert(this->is_address_valid_);
73 return this->address_;
76 // Return the size of the data. For allocated sections, this must
77 // be valid after Layout::finalize calls set_address, but need not
78 // be valid before then.
82 gold_assert(this->is_data_size_valid_);
83 return this->data_size_;
86 // Get the current data size.
88 current_data_size() const
89 { return this->current_data_size_for_child(); }
91 // Return true if data size is fixed.
93 is_data_size_fixed() const
94 { return this->is_data_size_fixed_; }
96 // Return the file offset. This is only valid after
97 // Layout::finalize is finished. For some non-allocated sections,
98 // it may not be valid until near the end of the link.
102 gold_assert(this->is_offset_valid_);
103 return this->offset_;
106 // Reset the address, file offset and data size. This essentially
107 // disables the sanity testing about duplicate and unknown settings.
109 reset_address_and_file_offset()
111 this->is_address_valid_ = false;
112 this->is_offset_valid_ = false;
113 if (!this->is_data_size_fixed_)
114 this->is_data_size_valid_ = false;
115 this->do_reset_address_and_file_offset();
118 // As above, but just for data size.
122 if (!this->is_data_size_fixed_)
123 this->is_data_size_valid_ = false;
126 // Return true if address and file offset already have reset values. In
127 // other words, calling reset_address_and_file_offset will not change them.
129 address_and_file_offset_have_reset_values() const
130 { return this->do_address_and_file_offset_have_reset_values(); }
132 // Return the required alignment.
135 { return this->do_addralign(); }
137 // Return whether this has a load address.
139 has_load_address() const
140 { return this->do_has_load_address(); }
142 // Return the load address.
145 { return this->do_load_address(); }
147 // Return whether this is an Output_section.
150 { return this->do_is_section(); }
152 // Return whether this is an Output_section of the specified type.
154 is_section_type(elfcpp::Elf_Word stt) const
155 { return this->do_is_section_type(stt); }
157 // Return whether this is an Output_section with the specified flag
160 is_section_flag_set(elfcpp::Elf_Xword shf) const
161 { return this->do_is_section_flag_set(shf); }
163 // Return the output section that this goes in, if there is one.
166 { return this->do_output_section(); }
168 const Output_section*
169 output_section() const
170 { return this->do_output_section(); }
172 // Return the output section index, if there is an output section.
175 { return this->do_out_shndx(); }
177 // Set the output section index, if this is an output section.
179 set_out_shndx(unsigned int shndx)
180 { this->do_set_out_shndx(shndx); }
182 // Set the address and file offset of this data, and finalize the
183 // size of the data. This is called during Layout::finalize for
184 // allocated sections.
186 set_address_and_file_offset(uint64_t addr, off_t off)
188 this->set_address(addr);
189 this->set_file_offset(off);
190 this->finalize_data_size();
195 set_address(uint64_t addr)
197 gold_assert(!this->is_address_valid_);
198 this->address_ = addr;
199 this->is_address_valid_ = true;
202 // Set the file offset.
204 set_file_offset(off_t off)
206 gold_assert(!this->is_offset_valid_);
208 this->is_offset_valid_ = true;
211 // Update the data size without finalizing it.
213 pre_finalize_data_size()
215 if (!this->is_data_size_valid_)
217 // Tell the child class to update the data size.
218 this->update_data_size();
222 // Finalize the data size.
226 if (!this->is_data_size_valid_)
228 // Tell the child class to set the data size.
229 this->set_final_data_size();
230 gold_assert(this->is_data_size_valid_);
234 // Set the TLS offset. Called only for SHT_TLS sections.
236 set_tls_offset(uint64_t tls_base)
237 { this->do_set_tls_offset(tls_base); }
239 // Return the TLS offset, relative to the base of the TLS segment.
240 // Valid only for SHT_TLS sections.
243 { return this->do_tls_offset(); }
245 // Write the data to the output file. This is called after
246 // Layout::finalize is complete.
248 write(Output_file* file)
249 { this->do_write(file); }
251 // This is called by Layout::finalize to note that the sizes of
252 // allocated sections must now be fixed.
255 { Output_data::allocated_sizes_are_fixed = true; }
257 // Used to check that layout has been done.
260 { return Output_data::allocated_sizes_are_fixed; }
262 // Note that a dynamic reloc has been applied to this data.
265 { this->has_dynamic_reloc_ = true; }
267 // Return whether a dynamic reloc has been applied.
269 has_dynamic_reloc() const
270 { return this->has_dynamic_reloc_; }
272 // Whether the address is valid.
274 is_address_valid() const
275 { return this->is_address_valid_; }
277 // Whether the file offset is valid.
279 is_offset_valid() const
280 { return this->is_offset_valid_; }
282 // Whether the data size is valid.
284 is_data_size_valid() const
285 { return this->is_data_size_valid_; }
287 // Print information to the map file.
289 print_to_mapfile(Mapfile* mapfile) const
290 { return this->do_print_to_mapfile(mapfile); }
293 // Functions that child classes may or in some cases must implement.
295 // Write the data to the output file.
297 do_write(Output_file*) = 0;
299 // Return the required alignment.
301 do_addralign() const = 0;
303 // Return whether this has a load address.
305 do_has_load_address() const
308 // Return the load address.
310 do_load_address() const
311 { gold_unreachable(); }
313 // Return whether this is an Output_section.
315 do_is_section() const
318 // Return whether this is an Output_section of the specified type.
319 // This only needs to be implement by Output_section.
321 do_is_section_type(elfcpp::Elf_Word) const
324 // Return whether this is an Output_section with the specific flag
325 // set. This only needs to be implemented by Output_section.
327 do_is_section_flag_set(elfcpp::Elf_Xword) const
330 // Return the output section, if there is one.
331 virtual Output_section*
335 virtual const Output_section*
336 do_output_section() const
339 // Return the output section index, if there is an output section.
342 { gold_unreachable(); }
344 // Set the output section index, if this is an output section.
346 do_set_out_shndx(unsigned int)
347 { gold_unreachable(); }
349 // This is a hook for derived classes to set the preliminary data size.
350 // This is called by pre_finalize_data_size, normally called during
351 // Layout::finalize, before the section address is set, and is used
352 // during an incremental update, when we need to know the size of a
353 // section before allocating space in the output file. For classes
354 // where the current data size is up to date, this default version of
355 // the method can be inherited.
360 // This is a hook for derived classes to set the data size. This is
361 // called by finalize_data_size, normally called during
362 // Layout::finalize, when the section address is set.
364 set_final_data_size()
365 { gold_unreachable(); }
367 // A hook for resetting the address and file offset.
369 do_reset_address_and_file_offset()
372 // Return true if address and file offset already have reset values. In
373 // other words, calling reset_address_and_file_offset will not change them.
374 // A child class overriding do_reset_address_and_file_offset may need to
375 // also override this.
377 do_address_and_file_offset_have_reset_values() const
378 { return !this->is_address_valid_ && !this->is_offset_valid_; }
380 // Set the TLS offset. Called only for SHT_TLS sections.
382 do_set_tls_offset(uint64_t)
383 { gold_unreachable(); }
385 // Return the TLS offset, relative to the base of the TLS segment.
386 // Valid only for SHT_TLS sections.
388 do_tls_offset() const
389 { gold_unreachable(); }
391 // Print to the map file. This only needs to be implemented by
392 // classes which may appear in a PT_LOAD segment.
394 do_print_to_mapfile(Mapfile*) const
395 { gold_unreachable(); }
397 // Functions that child classes may call.
399 // Reset the address. The Output_section class needs this when an
400 // SHF_ALLOC input section is added to an output section which was
401 // formerly not SHF_ALLOC.
403 mark_address_invalid()
404 { this->is_address_valid_ = false; }
406 // Set the size of the data.
408 set_data_size(off_t data_size)
410 gold_assert(!this->is_data_size_valid_
411 && !this->is_data_size_fixed_);
412 this->data_size_ = data_size;
413 this->is_data_size_valid_ = true;
416 // Fix the data size. Once it is fixed, it cannot be changed
417 // and the data size remains always valid.
421 gold_assert(this->is_data_size_valid_);
422 this->is_data_size_fixed_ = true;
425 // Get the current data size--this is for the convenience of
426 // sections which build up their size over time.
428 current_data_size_for_child() const
429 { return this->data_size_; }
431 // Set the current data size--this is for the convenience of
432 // sections which build up their size over time.
434 set_current_data_size_for_child(off_t data_size)
436 gold_assert(!this->is_data_size_valid_);
437 this->data_size_ = data_size;
440 // Return default alignment for the target size.
444 // Return default alignment for a specified size--32 or 64.
446 default_alignment_for_size(int size);
449 Output_data(const Output_data&);
450 Output_data& operator=(const Output_data&);
452 // This is used for verification, to make sure that we don't try to
453 // change any sizes of allocated sections after we set the section
455 static bool allocated_sizes_are_fixed;
457 // Memory address in output file.
459 // Size of data in output file.
461 // File offset of contents in output file.
463 // Whether address_ is valid.
464 bool is_address_valid_ : 1;
465 // Whether data_size_ is valid.
466 bool is_data_size_valid_ : 1;
467 // Whether offset_ is valid.
468 bool is_offset_valid_ : 1;
469 // Whether data size is fixed.
470 bool is_data_size_fixed_ : 1;
471 // Whether any dynamic relocs have been applied to this section.
472 bool has_dynamic_reloc_ : 1;
475 // Output the section headers.
477 class Output_section_headers : public Output_data
480 Output_section_headers(const Layout*,
481 const Layout::Segment_list*,
482 const Layout::Section_list*,
483 const Layout::Section_list*,
485 const Output_section*);
488 // Write the data to the file.
490 do_write(Output_file*);
492 // Return the required alignment.
495 { return Output_data::default_alignment(); }
497 // Write to a map file.
499 do_print_to_mapfile(Mapfile* mapfile) const
500 { mapfile->print_output_data(this, _("** section headers")); }
502 // Update the data size.
505 { this->set_data_size(this->do_size()); }
507 // Set final data size.
509 set_final_data_size()
510 { this->set_data_size(this->do_size()); }
513 // Write the data to the file with the right size and endianness.
514 template<int size, bool big_endian>
516 do_sized_write(Output_file*);
518 // Compute data size.
522 const Layout* layout_;
523 const Layout::Segment_list* segment_list_;
524 const Layout::Section_list* section_list_;
525 const Layout::Section_list* unattached_section_list_;
526 const Stringpool* secnamepool_;
527 const Output_section* shstrtab_section_;
530 // Output the segment headers.
532 class Output_segment_headers : public Output_data
535 Output_segment_headers(const Layout::Segment_list& segment_list);
538 // Write the data to the file.
540 do_write(Output_file*);
542 // Return the required alignment.
545 { return Output_data::default_alignment(); }
547 // Write to a map file.
549 do_print_to_mapfile(Mapfile* mapfile) const
550 { mapfile->print_output_data(this, _("** segment headers")); }
552 // Set final data size.
554 set_final_data_size()
555 { this->set_data_size(this->do_size()); }
558 // Write the data to the file with the right size and endianness.
559 template<int size, bool big_endian>
561 do_sized_write(Output_file*);
563 // Compute the current size.
567 const Layout::Segment_list& segment_list_;
570 // Output the ELF file header.
572 class Output_file_header : public Output_data
575 Output_file_header(Target*,
577 const Output_segment_headers*);
579 // Add information about the section headers. We lay out the ELF
580 // file header before we create the section headers.
581 void set_section_info(const Output_section_headers*,
582 const Output_section* shstrtab);
585 // Write the data to the file.
587 do_write(Output_file*);
589 // Return the required alignment.
592 { return Output_data::default_alignment(); }
594 // Write to a map file.
596 do_print_to_mapfile(Mapfile* mapfile) const
597 { mapfile->print_output_data(this, _("** file header")); }
599 // Set final data size.
601 set_final_data_size(void)
602 { this->set_data_size(this->do_size()); }
605 // Write the data to the file with the right size and endianness.
606 template<int size, bool big_endian>
608 do_sized_write(Output_file*);
610 // Return the value to use for the entry address.
612 typename elfcpp::Elf_types<size>::Elf_Addr
615 // Compute the current data size.
620 const Symbol_table* symtab_;
621 const Output_segment_headers* segment_header_;
622 const Output_section_headers* section_header_;
623 const Output_section* shstrtab_;
626 // Output sections are mainly comprised of input sections. However,
627 // there are cases where we have data to write out which is not in an
628 // input section. Output_section_data is used in such cases. This is
629 // an abstract base class.
631 class Output_section_data : public Output_data
634 Output_section_data(off_t data_size, uint64_t addralign,
635 bool is_data_size_fixed)
636 : Output_data(), output_section_(NULL), addralign_(addralign)
638 this->set_data_size(data_size);
639 if (is_data_size_fixed)
640 this->fix_data_size();
643 Output_section_data(uint64_t addralign)
644 : Output_data(), output_section_(NULL), addralign_(addralign)
647 // Return the output section.
650 { return this->output_section_; }
652 const Output_section*
653 output_section() const
654 { return this->output_section_; }
656 // Record the output section.
658 set_output_section(Output_section* os);
660 // Add an input section, for SHF_MERGE sections. This returns true
661 // if the section was handled.
663 add_input_section(Relobj* object, unsigned int shndx)
664 { return this->do_add_input_section(object, shndx); }
666 // Given an input OBJECT, an input section index SHNDX within that
667 // object, and an OFFSET relative to the start of that input
668 // section, return whether or not the corresponding offset within
669 // the output section is known. If this function returns true, it
670 // sets *POUTPUT to the output offset. The value -1 indicates that
671 // this input offset is being discarded.
673 output_offset(const Relobj* object, unsigned int shndx,
674 section_offset_type offset,
675 section_offset_type* poutput) const
676 { return this->do_output_offset(object, shndx, offset, poutput); }
678 // Write the contents to a buffer. This is used for sections which
679 // require postprocessing, such as compression.
681 write_to_buffer(unsigned char* buffer)
682 { this->do_write_to_buffer(buffer); }
684 // Print merge stats to stderr. This should only be called for
685 // SHF_MERGE sections.
687 print_merge_stats(const char* section_name)
688 { this->do_print_merge_stats(section_name); }
691 // The child class must implement do_write.
693 // The child class may implement specific adjustments to the output
696 do_adjust_output_section(Output_section*)
699 // May be implemented by child class. Return true if the section
702 do_add_input_section(Relobj*, unsigned int)
703 { gold_unreachable(); }
705 // The child class may implement output_offset.
707 do_output_offset(const Relobj*, unsigned int, section_offset_type,
708 section_offset_type*) const
711 // The child class may implement write_to_buffer. Most child
712 // classes can not appear in a compressed section, and they do not
715 do_write_to_buffer(unsigned char*)
716 { gold_unreachable(); }
718 // Print merge statistics.
720 do_print_merge_stats(const char*)
721 { gold_unreachable(); }
723 // Return the required alignment.
726 { return this->addralign_; }
728 // Return the output section.
731 { return this->output_section_; }
733 const Output_section*
734 do_output_section() const
735 { return this->output_section_; }
737 // Return the section index of the output section.
739 do_out_shndx() const;
741 // Set the alignment.
743 set_addralign(uint64_t addralign);
746 // The output section for this section.
747 Output_section* output_section_;
748 // The required alignment.
752 // Some Output_section_data classes build up their data step by step,
753 // rather than all at once. This class provides an interface for
756 class Output_section_data_build : public Output_section_data
759 Output_section_data_build(uint64_t addralign)
760 : Output_section_data(addralign)
763 Output_section_data_build(off_t data_size, uint64_t addralign)
764 : Output_section_data(data_size, addralign, false)
767 // Set the current data size.
769 set_current_data_size(off_t data_size)
770 { this->set_current_data_size_for_child(data_size); }
773 // Set the final data size.
775 set_final_data_size()
776 { this->set_data_size(this->current_data_size_for_child()); }
779 // A simple case of Output_data in which we have constant data to
782 class Output_data_const : public Output_section_data
785 Output_data_const(const std::string& data, uint64_t addralign)
786 : Output_section_data(data.size(), addralign, true), data_(data)
789 Output_data_const(const char* p, off_t len, uint64_t addralign)
790 : Output_section_data(len, addralign, true), data_(p, len)
793 Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
794 : Output_section_data(len, addralign, true),
795 data_(reinterpret_cast<const char*>(p), len)
799 // Write the data to the output file.
801 do_write(Output_file*);
803 // Write the data to a buffer.
805 do_write_to_buffer(unsigned char* buffer)
806 { memcpy(buffer, this->data_.data(), this->data_.size()); }
808 // Write to a map file.
810 do_print_to_mapfile(Mapfile* mapfile) const
811 { mapfile->print_output_data(this, _("** fill")); }
817 // Another version of Output_data with constant data, in which the
818 // buffer is allocated by the caller.
820 class Output_data_const_buffer : public Output_section_data
823 Output_data_const_buffer(const unsigned char* p, off_t len,
824 uint64_t addralign, const char* map_name)
825 : Output_section_data(len, addralign, true),
826 p_(p), map_name_(map_name)
830 // Write the data the output file.
832 do_write(Output_file*);
834 // Write the data to a buffer.
836 do_write_to_buffer(unsigned char* buffer)
837 { memcpy(buffer, this->p_, this->data_size()); }
839 // Write to a map file.
841 do_print_to_mapfile(Mapfile* mapfile) const
842 { mapfile->print_output_data(this, _(this->map_name_)); }
845 // The data to output.
846 const unsigned char* p_;
847 // Name to use in a map file. Maps are a rarely used feature, but
848 // the space usage is minor as aren't very many of these objects.
849 const char* map_name_;
852 // A place holder for a fixed amount of data written out via some
855 class Output_data_fixed_space : public Output_section_data
858 Output_data_fixed_space(off_t data_size, uint64_t addralign,
859 const char* map_name)
860 : Output_section_data(data_size, addralign, true),
865 // Write out the data--the actual data must be written out
868 do_write(Output_file*)
871 // Write to a map file.
873 do_print_to_mapfile(Mapfile* mapfile) const
874 { mapfile->print_output_data(this, _(this->map_name_)); }
877 // Name to use in a map file. Maps are a rarely used feature, but
878 // the space usage is minor as aren't very many of these objects.
879 const char* map_name_;
882 // A place holder for variable sized data written out via some other
885 class Output_data_space : public Output_section_data_build
888 explicit Output_data_space(uint64_t addralign, const char* map_name)
889 : Output_section_data_build(addralign),
893 explicit Output_data_space(off_t data_size, uint64_t addralign,
894 const char* map_name)
895 : Output_section_data_build(data_size, addralign),
899 // Set the alignment.
901 set_space_alignment(uint64_t align)
902 { this->set_addralign(align); }
905 // Write out the data--the actual data must be written out
908 do_write(Output_file*)
911 // Write to a map file.
913 do_print_to_mapfile(Mapfile* mapfile) const
914 { mapfile->print_output_data(this, _(this->map_name_)); }
917 // Name to use in a map file. Maps are a rarely used feature, but
918 // the space usage is minor as aren't very many of these objects.
919 const char* map_name_;
922 // Fill fixed space with zeroes. This is just like
923 // Output_data_fixed_space, except that the map name is known.
925 class Output_data_zero_fill : public Output_section_data
928 Output_data_zero_fill(off_t data_size, uint64_t addralign)
929 : Output_section_data(data_size, addralign, true)
933 // There is no data to write out.
935 do_write(Output_file*)
938 // Write to a map file.
940 do_print_to_mapfile(Mapfile* mapfile) const
941 { mapfile->print_output_data(this, "** zero fill"); }
944 // A string table which goes into an output section.
946 class Output_data_strtab : public Output_section_data
949 Output_data_strtab(Stringpool* strtab)
950 : Output_section_data(1), strtab_(strtab)
954 // This is called to update the section size prior to assigning
955 // the address and file offset.
958 { this->set_final_data_size(); }
960 // This is called to set the address and file offset. Here we make
961 // sure that the Stringpool is finalized.
963 set_final_data_size();
965 // Write out the data.
967 do_write(Output_file*);
969 // Write the data to a buffer.
971 do_write_to_buffer(unsigned char* buffer)
972 { this->strtab_->write_to_buffer(buffer, this->data_size()); }
974 // Write to a map file.
976 do_print_to_mapfile(Mapfile* mapfile) const
977 { mapfile->print_output_data(this, _("** string table")); }
983 // This POD class is used to represent a single reloc in the output
984 // file. This could be a private class within Output_data_reloc, but
985 // the templatization is complex enough that I broke it out into a
986 // separate class. The class is templatized on either elfcpp::SHT_REL
987 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
988 // relocation or an ordinary relocation.
990 // A relocation can be against a global symbol, a local symbol, a
991 // local section symbol, an output section, or the undefined symbol at
992 // index 0. We represent the latter by using a NULL global symbol.
994 template<int sh_type, bool dynamic, int size, bool big_endian>
997 template<bool dynamic, int size, bool big_endian>
998 class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
1001 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
1002 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
1004 static const Address invalid_address = static_cast<Address>(0) - 1;
1006 // An uninitialized entry. We need this because we want to put
1007 // instances of this class into an STL container.
1009 : local_sym_index_(INVALID_CODE)
1012 // We have a bunch of different constructors. They come in pairs
1013 // depending on how the address of the relocation is specified. It
1014 // can either be an offset in an Output_data or an offset in an
1017 // A reloc against a global symbol.
1019 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
1020 Address address, bool is_relative, bool is_symbolless,
1021 bool use_plt_offset);
1023 Output_reloc(Symbol* gsym, unsigned int type,
1024 Sized_relobj<size, big_endian>* relobj,
1025 unsigned int shndx, Address address, bool is_relative,
1026 bool is_symbolless, bool use_plt_offset);
1028 // A reloc against a local symbol or local section symbol.
1030 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1031 unsigned int local_sym_index, unsigned int type,
1032 Output_data* od, Address address, bool is_relative,
1033 bool is_symbolless, bool is_section_symbol,
1034 bool use_plt_offset);
1036 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1037 unsigned int local_sym_index, unsigned int type,
1038 unsigned int shndx, Address address, bool is_relative,
1039 bool is_symbolless, bool is_section_symbol,
1040 bool use_plt_offset);
1042 // A reloc against the STT_SECTION symbol of an output section.
1044 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
1045 Address address, bool is_relative);
1047 Output_reloc(Output_section* os, unsigned int type,
1048 Sized_relobj<size, big_endian>* relobj, unsigned int shndx,
1049 Address address, bool is_relative);
1051 // An absolute or relative relocation with no symbol.
1053 Output_reloc(unsigned int type, Output_data* od, Address address,
1056 Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
1057 unsigned int shndx, Address address, bool is_relative);
1059 // A target specific relocation. The target will be called to get
1060 // the symbol index, passing ARG. The type and offset will be set
1061 // as for other relocation types.
1063 Output_reloc(unsigned int type, void* arg, Output_data* od,
1066 Output_reloc(unsigned int type, void* arg,
1067 Sized_relobj<size, big_endian>* relobj,
1068 unsigned int shndx, Address address);
1070 // Return the reloc type.
1073 { return this->type_; }
1075 // Return whether this is a RELATIVE relocation.
1078 { return this->is_relative_; }
1080 // Return whether this is a relocation which should not use
1081 // a symbol, but which obtains its addend from a symbol.
1083 is_symbolless() const
1084 { return this->is_symbolless_; }
1086 // Return whether this is against a local section symbol.
1088 is_local_section_symbol() const
1090 return (this->local_sym_index_ != GSYM_CODE
1091 && this->local_sym_index_ != SECTION_CODE
1092 && this->local_sym_index_ != INVALID_CODE
1093 && this->local_sym_index_ != TARGET_CODE
1094 && this->is_section_symbol_);
1097 // Return whether this is a target specific relocation.
1099 is_target_specific() const
1100 { return this->local_sym_index_ == TARGET_CODE; }
1102 // Return the argument to pass to the target for a target specific
1107 gold_assert(this->local_sym_index_ == TARGET_CODE);
1108 return this->u1_.arg;
1111 // For a local section symbol, return the offset of the input
1112 // section within the output section. ADDEND is the addend being
1113 // applied to the input section.
1115 local_section_offset(Addend addend) const;
1117 // Get the value of the symbol referred to by a Rel relocation when
1118 // we are adding the given ADDEND.
1120 symbol_value(Addend addend) const;
1122 // If this relocation is against an input section, return the
1123 // relocatable object containing the input section.
1124 Sized_relobj<size, big_endian>*
1127 if (this->shndx_ == INVALID_CODE)
1129 return this->u2_.relobj;
1132 // Write the reloc entry to an output view.
1134 write(unsigned char* pov) const;
1136 // Write the offset and info fields to Write_rel.
1137 template<typename Write_rel>
1138 void write_rel(Write_rel*) const;
1140 // This is used when sorting dynamic relocs. Return -1 to sort this
1141 // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
1143 compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
1146 // Return whether this reloc should be sorted before the argument
1147 // when sorting dynamic relocs.
1149 sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>&
1151 { return this->compare(r2) < 0; }
1154 // Record that we need a dynamic symbol index.
1156 set_needs_dynsym_index();
1158 // Return the symbol index.
1160 get_symbol_index() const;
1162 // Return the output address.
1164 get_address() const;
1166 // Codes for local_sym_index_.
1175 // Invalid uninitialized entry.
1181 // For a local symbol or local section symbol
1182 // (this->local_sym_index_ >= 0), the object. We will never
1183 // generate a relocation against a local symbol in a dynamic
1184 // object; that doesn't make sense. And our callers will always
1185 // be templatized, so we use Sized_relobj here.
1186 Sized_relobj<size, big_endian>* relobj;
1187 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
1188 // symbol. If this is NULL, it indicates a relocation against the
1189 // undefined 0 symbol.
1191 // For a relocation against an output section
1192 // (this->local_sym_index_ == SECTION_CODE), the output section.
1194 // For a target specific relocation, an argument to pass to the
1200 // If this->shndx_ is not INVALID CODE, the object which holds the
1201 // input section being used to specify the reloc address.
1202 Sized_relobj<size, big_endian>* relobj;
1203 // If this->shndx_ is INVALID_CODE, the output data being used to
1204 // specify the reloc address. This may be NULL if the reloc
1205 // address is absolute.
1208 // The address offset within the input section or the Output_data.
1210 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
1211 // relocation against an output section, or TARGET_CODE for a target
1212 // specific relocation, or INVALID_CODE for an uninitialized value.
1213 // Otherwise, for a local symbol (this->is_section_symbol_ is
1214 // false), the local symbol index. For a local section symbol
1215 // (this->is_section_symbol_ is true), the section index in the
1217 unsigned int local_sym_index_;
1218 // The reloc type--a processor specific code.
1219 unsigned int type_ : 28;
1220 // True if the relocation is a RELATIVE relocation.
1221 bool is_relative_ : 1;
1222 // True if the relocation is one which should not use
1223 // a symbol, but which obtains its addend from a symbol.
1224 bool is_symbolless_ : 1;
1225 // True if the relocation is against a section symbol.
1226 bool is_section_symbol_ : 1;
1227 // True if the addend should be the PLT offset.
1228 // (Used only for RELA, but stored here for space.)
1229 bool use_plt_offset_ : 1;
1230 // If the reloc address is an input section in an object, the
1231 // section index. This is INVALID_CODE if the reloc address is
1232 // specified in some other way.
1233 unsigned int shndx_;
1236 // The SHT_RELA version of Output_reloc<>. This is just derived from
1237 // the SHT_REL version of Output_reloc, but it adds an addend.
1239 template<bool dynamic, int size, bool big_endian>
1240 class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
1243 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
1244 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
1246 // An uninitialized entry.
1251 // A reloc against a global symbol.
1253 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
1254 Address address, Addend addend, bool is_relative,
1255 bool is_symbolless, bool use_plt_offset)
1256 : rel_(gsym, type, od, address, is_relative, is_symbolless,
1261 Output_reloc(Symbol* gsym, unsigned int type,
1262 Sized_relobj<size, big_endian>* relobj,
1263 unsigned int shndx, Address address, Addend addend,
1264 bool is_relative, bool is_symbolless, bool use_plt_offset)
1265 : rel_(gsym, type, relobj, shndx, address, is_relative,
1266 is_symbolless, use_plt_offset), addend_(addend)
1269 // A reloc against a local symbol.
1271 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1272 unsigned int local_sym_index, unsigned int type,
1273 Output_data* od, Address address,
1274 Addend addend, bool is_relative,
1275 bool is_symbolless, bool is_section_symbol,
1276 bool use_plt_offset)
1277 : rel_(relobj, local_sym_index, type, od, address, is_relative,
1278 is_symbolless, is_section_symbol, use_plt_offset),
1282 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1283 unsigned int local_sym_index, unsigned int type,
1284 unsigned int shndx, Address address,
1285 Addend addend, bool is_relative,
1286 bool is_symbolless, bool is_section_symbol,
1287 bool use_plt_offset)
1288 : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
1289 is_symbolless, is_section_symbol, use_plt_offset),
1293 // A reloc against the STT_SECTION symbol of an output section.
1295 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
1296 Address address, Addend addend, bool is_relative)
1297 : rel_(os, type, od, address, is_relative), addend_(addend)
1300 Output_reloc(Output_section* os, unsigned int type,
1301 Sized_relobj<size, big_endian>* relobj,
1302 unsigned int shndx, Address address, Addend addend,
1304 : rel_(os, type, relobj, shndx, address, is_relative), addend_(addend)
1307 // An absolute or relative relocation with no symbol.
1309 Output_reloc(unsigned int type, Output_data* od, Address address,
1310 Addend addend, bool is_relative)
1311 : rel_(type, od, address, is_relative), addend_(addend)
1314 Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
1315 unsigned int shndx, Address address, Addend addend,
1317 : rel_(type, relobj, shndx, address, is_relative), addend_(addend)
1320 // A target specific relocation. The target will be called to get
1321 // the symbol index and the addend, passing ARG. The type and
1322 // offset will be set as for other relocation types.
1324 Output_reloc(unsigned int type, void* arg, Output_data* od,
1325 Address address, Addend addend)
1326 : rel_(type, arg, od, address), addend_(addend)
1329 Output_reloc(unsigned int type, void* arg,
1330 Sized_relobj<size, big_endian>* relobj,
1331 unsigned int shndx, Address address, Addend addend)
1332 : rel_(type, arg, relobj, shndx, address), addend_(addend)
1335 // Return whether this is a RELATIVE relocation.
1338 { return this->rel_.is_relative(); }
1340 // Return whether this is a relocation which should not use
1341 // a symbol, but which obtains its addend from a symbol.
1343 is_symbolless() const
1344 { return this->rel_.is_symbolless(); }
1346 // If this relocation is against an input section, return the
1347 // relocatable object containing the input section.
1348 Sized_relobj<size, big_endian>*
1350 { return this->rel_.get_relobj(); }
1352 // Write the reloc entry to an output view.
1354 write(unsigned char* pov) const;
1356 // Return whether this reloc should be sorted before the argument
1357 // when sorting dynamic relocs.
1359 sort_before(const Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>&
1362 int i = this->rel_.compare(r2.rel_);
1368 return this->addend_ < r2.addend_;
1373 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
1378 // Output_data_reloc_generic is a non-template base class for
1379 // Output_data_reloc_base. This gives the generic code a way to hold
1380 // a pointer to a reloc section.
1382 class Output_data_reloc_generic : public Output_section_data_build
1385 Output_data_reloc_generic(int size, bool sort_relocs)
1386 : Output_section_data_build(Output_data::default_alignment_for_size(size)),
1387 relative_reloc_count_(0), sort_relocs_(sort_relocs)
1390 // Return the number of relative relocs in this section.
1392 relative_reloc_count() const
1393 { return this->relative_reloc_count_; }
1395 // Whether we should sort the relocs.
1398 { return this->sort_relocs_; }
1400 // Add a reloc of type TYPE against the global symbol GSYM. The
1401 // relocation applies to the data at offset ADDRESS within OD.
1403 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1404 uint64_t address, uint64_t addend) = 0;
1406 // Add a reloc of type TYPE against the global symbol GSYM. The
1407 // relocation applies to data at offset ADDRESS within section SHNDX
1408 // of object file RELOBJ. OD is the associated output section.
1410 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1411 Relobj* relobj, unsigned int shndx, uint64_t address,
1412 uint64_t addend) = 0;
1414 // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
1415 // in RELOBJ. The relocation applies to the data at offset ADDRESS
1418 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1419 unsigned int type, Output_data* od, uint64_t address,
1420 uint64_t addend) = 0;
1422 // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
1423 // in RELOBJ. The relocation applies to the data at offset ADDRESS
1424 // within section SHNDX of RELOBJ. OD is the associated output
1427 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1428 unsigned int type, Output_data* od, unsigned int shndx,
1429 uint64_t address, uint64_t addend) = 0;
1431 // Add a reloc of type TYPE against the STT_SECTION symbol of the
1432 // output section OS. The relocation applies to the data at offset
1433 // ADDRESS within OD.
1435 add_output_section_generic(Output_section *os, unsigned int type,
1436 Output_data* od, uint64_t address,
1437 uint64_t addend) = 0;
1439 // Add a reloc of type TYPE against the STT_SECTION symbol of the
1440 // output section OS. The relocation applies to the data at offset
1441 // ADDRESS within section SHNDX of RELOBJ. OD is the associated
1444 add_output_section_generic(Output_section* os, unsigned int type,
1445 Output_data* od, Relobj* relobj,
1446 unsigned int shndx, uint64_t address,
1447 uint64_t addend) = 0;
1450 // Note that we've added another relative reloc.
1452 bump_relative_reloc_count()
1453 { ++this->relative_reloc_count_; }
1456 // The number of relative relocs added to this section. This is to
1457 // support DT_RELCOUNT.
1458 size_t relative_reloc_count_;
1459 // Whether to sort the relocations when writing them out, to make
1460 // the dynamic linker more efficient.
1464 // Output_data_reloc is used to manage a section containing relocs.
1465 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
1466 // indicates whether this is a dynamic relocation or a normal
1467 // relocation. Output_data_reloc_base is a base class.
1468 // Output_data_reloc is the real class, which we specialize based on
1471 template<int sh_type, bool dynamic, int size, bool big_endian>
1472 class Output_data_reloc_base : public Output_data_reloc_generic
1475 typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
1476 typedef typename Output_reloc_type::Address Address;
1477 static const int reloc_size =
1478 Reloc_types<sh_type, size, big_endian>::reloc_size;
1480 // Construct the section.
1481 Output_data_reloc_base(bool sort_relocs)
1482 : Output_data_reloc_generic(size, sort_relocs)
1486 // Write out the data.
1488 do_write(Output_file*);
1490 // Set the entry size and the link.
1492 do_adjust_output_section(Output_section* os);
1494 // Write to a map file.
1496 do_print_to_mapfile(Mapfile* mapfile) const
1498 mapfile->print_output_data(this,
1500 ? _("** dynamic relocs")
1504 // Add a relocation entry.
1506 add(Output_data* od, const Output_reloc_type& reloc)
1508 this->relocs_.push_back(reloc);
1509 this->set_current_data_size(this->relocs_.size() * reloc_size);
1511 od->add_dynamic_reloc();
1512 if (reloc.is_relative())
1513 this->bump_relative_reloc_count();
1514 Sized_relobj<size, big_endian>* relobj = reloc.get_relobj();
1516 relobj->add_dyn_reloc(this->relocs_.size() - 1);
1520 typedef std::vector<Output_reloc_type> Relocs;
1522 // The class used to sort the relocations.
1523 struct Sort_relocs_comparison
1526 operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const
1527 { return r1.sort_before(r2); }
1530 // The relocations in this section.
1534 // The class which callers actually create.
1536 template<int sh_type, bool dynamic, int size, bool big_endian>
1537 class Output_data_reloc;
1539 // The SHT_REL version of Output_data_reloc.
1541 template<bool dynamic, int size, bool big_endian>
1542 class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
1543 : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
1546 typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
1550 typedef typename Base::Output_reloc_type Output_reloc_type;
1551 typedef typename Output_reloc_type::Address Address;
1553 Output_data_reloc(bool sr)
1554 : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>(sr)
1557 // Add a reloc against a global symbol.
1560 add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
1562 this->add(od, Output_reloc_type(gsym, type, od, address,
1563 false, false, false));
1567 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1568 Sized_relobj<size, big_endian>* relobj,
1569 unsigned int shndx, Address address)
1571 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1572 false, false, false));
1576 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1577 uint64_t address, uint64_t addend)
1579 gold_assert(addend == 0);
1580 this->add(od, Output_reloc_type(gsym, type, od,
1581 convert_types<Address, uint64_t>(address),
1582 false, false, false));
1586 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1587 Relobj* relobj, unsigned int shndx, uint64_t address,
1590 gold_assert(addend == 0);
1591 Sized_relobj<size, big_endian>* sized_relobj =
1592 static_cast<Sized_relobj<size, big_endian>*>(relobj);
1593 this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx,
1594 convert_types<Address, uint64_t>(address),
1595 false, false, false));
1598 // Add a RELATIVE reloc against a global symbol. The final relocation
1599 // will not reference the symbol.
1602 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1605 this->add(od, Output_reloc_type(gsym, type, od, address, true, true,
1610 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1611 Sized_relobj<size, big_endian>* relobj,
1612 unsigned int shndx, Address address)
1614 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1615 true, true, false));
1618 // Add a global relocation which does not use a symbol for the relocation,
1619 // but which gets its addend from a symbol.
1622 add_symbolless_global_addend(Symbol* gsym, unsigned int type,
1623 Output_data* od, Address address)
1625 this->add(od, Output_reloc_type(gsym, type, od, address, false, true,
1630 add_symbolless_global_addend(Symbol* gsym, unsigned int type,
1632 Sized_relobj<size, big_endian>* relobj,
1633 unsigned int shndx, Address address)
1635 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1636 false, true, false));
1639 // Add a reloc against a local symbol.
1642 add_local(Sized_relobj<size, big_endian>* relobj,
1643 unsigned int local_sym_index, unsigned int type,
1644 Output_data* od, Address address)
1646 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1647 address, false, false, false, false));
1651 add_local(Sized_relobj<size, big_endian>* relobj,
1652 unsigned int local_sym_index, unsigned int type,
1653 Output_data* od, unsigned int shndx, Address address)
1655 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1656 address, false, false, false, false));
1660 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1661 unsigned int type, Output_data* od, uint64_t address,
1664 gold_assert(addend == 0);
1665 Sized_relobj<size, big_endian>* sized_relobj =
1666 static_cast<Sized_relobj<size, big_endian> *>(relobj);
1667 this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od,
1668 convert_types<Address, uint64_t>(address),
1669 false, false, false, false));
1673 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1674 unsigned int type, Output_data* od, unsigned int shndx,
1675 uint64_t address, uint64_t addend)
1677 gold_assert(addend == 0);
1678 Sized_relobj<size, big_endian>* sized_relobj =
1679 static_cast<Sized_relobj<size, big_endian>*>(relobj);
1680 this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx,
1681 convert_types<Address, uint64_t>(address),
1682 false, false, false, false));
1685 // Add a RELATIVE reloc against a local symbol.
1688 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1689 unsigned int local_sym_index, unsigned int type,
1690 Output_data* od, Address address)
1692 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1693 address, true, true, false, false));
1697 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1698 unsigned int local_sym_index, unsigned int type,
1699 Output_data* od, unsigned int shndx, Address address)
1701 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1702 address, true, true, false, false));
1706 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1707 unsigned int local_sym_index, unsigned int type,
1708 Output_data* od, unsigned int shndx, Address address,
1709 bool use_plt_offset)
1711 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1712 address, true, true, false,
1716 // Add a local relocation which does not use a symbol for the relocation,
1717 // but which gets its addend from a symbol.
1720 add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
1721 unsigned int local_sym_index, unsigned int type,
1722 Output_data* od, Address address)
1724 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1725 address, false, true, false, false));
1729 add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
1730 unsigned int local_sym_index, unsigned int type,
1731 Output_data* od, unsigned int shndx,
1734 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1735 address, false, true, false, false));
1738 // Add a reloc against a local section symbol. This will be
1739 // converted into a reloc against the STT_SECTION symbol of the
1743 add_local_section(Sized_relobj<size, big_endian>* relobj,
1744 unsigned int input_shndx, unsigned int type,
1745 Output_data* od, Address address)
1747 this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
1748 address, false, false, true, false));
1752 add_local_section(Sized_relobj<size, big_endian>* relobj,
1753 unsigned int input_shndx, unsigned int type,
1754 Output_data* od, unsigned int shndx, Address address)
1756 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
1757 address, false, false, true, false));
1760 // A reloc against the STT_SECTION symbol of an output section.
1761 // OS is the Output_section that the relocation refers to; OD is
1762 // the Output_data object being relocated.
1765 add_output_section(Output_section* os, unsigned int type,
1766 Output_data* od, Address address)
1767 { this->add(od, Output_reloc_type(os, type, od, address, false)); }
1770 add_output_section(Output_section* os, unsigned int type, Output_data* od,
1771 Sized_relobj<size, big_endian>* relobj,
1772 unsigned int shndx, Address address)
1773 { this->add(od, Output_reloc_type(os, type, relobj, shndx, address, false)); }
1776 add_output_section_generic(Output_section* os, unsigned int type,
1777 Output_data* od, uint64_t address,
1780 gold_assert(addend == 0);
1781 this->add(od, Output_reloc_type(os, type, od,
1782 convert_types<Address, uint64_t>(address),
1787 add_output_section_generic(Output_section* os, unsigned int type,
1788 Output_data* od, Relobj* relobj,
1789 unsigned int shndx, uint64_t address,
1792 gold_assert(addend == 0);
1793 Sized_relobj<size, big_endian>* sized_relobj =
1794 static_cast<Sized_relobj<size, big_endian>*>(relobj);
1795 this->add(od, Output_reloc_type(os, type, sized_relobj, shndx,
1796 convert_types<Address, uint64_t>(address),
1800 // As above, but the reloc TYPE is relative
1803 add_output_section_relative(Output_section* os, unsigned int type,
1804 Output_data* od, Address address)
1805 { this->add(od, Output_reloc_type(os, type, od, address, true)); }
1808 add_output_section_relative(Output_section* os, unsigned int type,
1810 Sized_relobj<size, big_endian>* relobj,
1811 unsigned int shndx, Address address)
1812 { this->add(od, Output_reloc_type(os, type, relobj, shndx, address, true)); }
1814 // Add an absolute relocation.
1817 add_absolute(unsigned int type, Output_data* od, Address address)
1818 { this->add(od, Output_reloc_type(type, od, address, false)); }
1821 add_absolute(unsigned int type, Output_data* od,
1822 Sized_relobj<size, big_endian>* relobj,
1823 unsigned int shndx, Address address)
1824 { this->add(od, Output_reloc_type(type, relobj, shndx, address, false)); }
1826 // Add a relative relocation
1829 add_relative(unsigned int type, Output_data* od, Address address)
1830 { this->add(od, Output_reloc_type(type, od, address, true)); }
1833 add_relative(unsigned int type, Output_data* od,
1834 Sized_relobj<size, big_endian>* relobj,
1835 unsigned int shndx, Address address)
1836 { this->add(od, Output_reloc_type(type, relobj, shndx, address, true)); }
1838 // Add a target specific relocation. A target which calls this must
1839 // define the reloc_symbol_index and reloc_addend virtual functions.
1842 add_target_specific(unsigned int type, void* arg, Output_data* od,
1844 { this->add(od, Output_reloc_type(type, arg, od, address)); }
1847 add_target_specific(unsigned int type, void* arg, Output_data* od,
1848 Sized_relobj<size, big_endian>* relobj,
1849 unsigned int shndx, Address address)
1850 { this->add(od, Output_reloc_type(type, arg, relobj, shndx, address)); }
1853 // The SHT_RELA version of Output_data_reloc.
1855 template<bool dynamic, int size, bool big_endian>
1856 class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
1857 : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
1860 typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
1864 typedef typename Base::Output_reloc_type Output_reloc_type;
1865 typedef typename Output_reloc_type::Address Address;
1866 typedef typename Output_reloc_type::Addend Addend;
1868 Output_data_reloc(bool sr)
1869 : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>(sr)
1872 // Add a reloc against a global symbol.
1875 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1876 Address address, Addend addend)
1878 this->add(od, Output_reloc_type(gsym, type, od, address, addend,
1879 false, false, false));
1883 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1884 Sized_relobj<size, big_endian>* relobj,
1885 unsigned int shndx, Address address,
1888 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1889 addend, false, false, false));
1893 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1894 uint64_t address, uint64_t addend)
1896 this->add(od, Output_reloc_type(gsym, type, od,
1897 convert_types<Address, uint64_t>(address),
1898 convert_types<Addend, uint64_t>(addend),
1899 false, false, false));
1903 add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
1904 Relobj* relobj, unsigned int shndx, uint64_t address,
1907 Sized_relobj<size, big_endian>* sized_relobj =
1908 static_cast<Sized_relobj<size, big_endian>*>(relobj);
1909 this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx,
1910 convert_types<Address, uint64_t>(address),
1911 convert_types<Addend, uint64_t>(addend),
1912 false, false, false));
1915 // Add a RELATIVE reloc against a global symbol. The final output
1916 // relocation will not reference the symbol, but we must keep the symbol
1917 // information long enough to set the addend of the relocation correctly
1918 // when it is written.
1921 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1922 Address address, Addend addend, bool use_plt_offset)
1924 this->add(od, Output_reloc_type(gsym, type, od, address, addend, true,
1925 true, use_plt_offset));
1929 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1930 Sized_relobj<size, big_endian>* relobj,
1931 unsigned int shndx, Address address, Addend addend,
1932 bool use_plt_offset)
1934 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1935 addend, true, true, use_plt_offset));
1938 // Add a global relocation which does not use a symbol for the relocation,
1939 // but which gets its addend from a symbol.
1942 add_symbolless_global_addend(Symbol* gsym, unsigned int type, Output_data* od,
1943 Address address, Addend addend)
1945 this->add(od, Output_reloc_type(gsym, type, od, address, addend,
1946 false, true, false));
1950 add_symbolless_global_addend(Symbol* gsym, unsigned int type,
1952 Sized_relobj<size, big_endian>* relobj,
1953 unsigned int shndx, Address address,
1956 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1957 addend, false, true, false));
1960 // Add a reloc against a local symbol.
1963 add_local(Sized_relobj<size, big_endian>* relobj,
1964 unsigned int local_sym_index, unsigned int type,
1965 Output_data* od, Address address, Addend addend)
1967 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
1968 addend, false, false, false, false));
1972 add_local(Sized_relobj<size, big_endian>* relobj,
1973 unsigned int local_sym_index, unsigned int type,
1974 Output_data* od, unsigned int shndx, Address address,
1977 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1978 address, addend, false, false, false,
1983 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1984 unsigned int type, Output_data* od, uint64_t address,
1987 Sized_relobj<size, big_endian>* sized_relobj =
1988 static_cast<Sized_relobj<size, big_endian> *>(relobj);
1989 this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od,
1990 convert_types<Address, uint64_t>(address),
1991 convert_types<Addend, uint64_t>(addend),
1992 false, false, false, false));
1996 add_local_generic(Relobj* relobj, unsigned int local_sym_index,
1997 unsigned int type, Output_data* od, unsigned int shndx,
1998 uint64_t address, uint64_t addend)
2000 Sized_relobj<size, big_endian>* sized_relobj =
2001 static_cast<Sized_relobj<size, big_endian>*>(relobj);
2002 this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx,
2003 convert_types<Address, uint64_t>(address),
2004 convert_types<Addend, uint64_t>(addend),
2005 false, false, false, false));
2008 // Add a RELATIVE reloc against a local symbol.
2011 add_local_relative(Sized_relobj<size, big_endian>* relobj,
2012 unsigned int local_sym_index, unsigned int type,
2013 Output_data* od, Address address, Addend addend,
2014 bool use_plt_offset)
2016 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
2017 addend, true, true, false,
2022 add_local_relative(Sized_relobj<size, big_endian>* relobj,
2023 unsigned int local_sym_index, unsigned int type,
2024 Output_data* od, unsigned int shndx, Address address,
2025 Addend addend, bool use_plt_offset)
2027 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
2028 address, addend, true, true, false,
2032 // Add a local relocation which does not use a symbol for the relocation,
2033 // but which gets it's addend from a symbol.
2036 add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
2037 unsigned int local_sym_index, unsigned int type,
2038 Output_data* od, Address address, Addend addend)
2040 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
2041 addend, false, true, false, false));
2045 add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
2046 unsigned int local_sym_index, unsigned int type,
2047 Output_data* od, unsigned int shndx,
2048 Address address, Addend addend)
2050 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
2051 address, addend, false, true, false,
2055 // Add a reloc against a local section symbol. This will be
2056 // converted into a reloc against the STT_SECTION symbol of the
2060 add_local_section(Sized_relobj<size, big_endian>* relobj,
2061 unsigned int input_shndx, unsigned int type,
2062 Output_data* od, Address address, Addend addend)
2064 this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
2065 addend, false, false, true, false));
2069 add_local_section(Sized_relobj<size, big_endian>* relobj,
2070 unsigned int input_shndx, unsigned int type,
2071 Output_data* od, unsigned int shndx, Address address,
2074 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
2075 address, addend, false, false, true,
2079 // A reloc against the STT_SECTION symbol of an output section.
2082 add_output_section(Output_section* os, unsigned int type, Output_data* od,
2083 Address address, Addend addend)
2084 { this->add(od, Output_reloc_type(os, type, od, address, addend, false)); }
2087 add_output_section(Output_section* os, unsigned int type, Output_data* od,
2088 Sized_relobj<size, big_endian>* relobj,
2089 unsigned int shndx, Address address, Addend addend)
2091 this->add(od, Output_reloc_type(os, type, relobj, shndx, address,
2096 add_output_section_generic(Output_section* os, unsigned int type,
2097 Output_data* od, uint64_t address,
2100 this->add(od, Output_reloc_type(os, type, od,
2101 convert_types<Address, uint64_t>(address),
2102 convert_types<Addend, uint64_t>(addend),
2107 add_output_section_generic(Output_section* os, unsigned int type,
2108 Output_data* od, Relobj* relobj,
2109 unsigned int shndx, uint64_t address,
2112 Sized_relobj<size, big_endian>* sized_relobj =
2113 static_cast<Sized_relobj<size, big_endian>*>(relobj);
2114 this->add(od, Output_reloc_type(os, type, sized_relobj, shndx,
2115 convert_types<Address, uint64_t>(address),
2116 convert_types<Addend, uint64_t>(addend),
2120 // As above, but the reloc TYPE is relative
2123 add_output_section_relative(Output_section* os, unsigned int type,
2124 Output_data* od, Address address, Addend addend)
2125 { this->add(od, Output_reloc_type(os, type, od, address, addend, true)); }
2128 add_output_section_relative(Output_section* os, unsigned int type,
2130 Sized_relobj<size, big_endian>* relobj,
2131 unsigned int shndx, Address address,
2134 this->add(od, Output_reloc_type(os, type, relobj, shndx,
2135 address, addend, true));
2138 // Add an absolute relocation.
2141 add_absolute(unsigned int type, Output_data* od, Address address,
2143 { this->add(od, Output_reloc_type(type, od, address, addend, false)); }
2146 add_absolute(unsigned int type, Output_data* od,
2147 Sized_relobj<size, big_endian>* relobj,
2148 unsigned int shndx, Address address, Addend addend)
2150 this->add(od, Output_reloc_type(type, relobj, shndx, address, addend,
2154 // Add a relative relocation
2157 add_relative(unsigned int type, Output_data* od, Address address,
2159 { this->add(od, Output_reloc_type(type, od, address, addend, true)); }
2162 add_relative(unsigned int type, Output_data* od,
2163 Sized_relobj<size, big_endian>* relobj,
2164 unsigned int shndx, Address address, Addend addend)
2166 this->add(od, Output_reloc_type(type, relobj, shndx, address, addend,
2170 // Add a target specific relocation. A target which calls this must
2171 // define the reloc_symbol_index and reloc_addend virtual functions.
2174 add_target_specific(unsigned int type, void* arg, Output_data* od,
2175 Address address, Addend addend)
2176 { this->add(od, Output_reloc_type(type, arg, od, address, addend)); }
2179 add_target_specific(unsigned int type, void* arg, Output_data* od,
2180 Sized_relobj<size, big_endian>* relobj,
2181 unsigned int shndx, Address address, Addend addend)
2183 this->add(od, Output_reloc_type(type, arg, relobj, shndx, address,
2188 // Output_relocatable_relocs represents a relocation section in a
2189 // relocatable link. The actual data is written out in the target
2190 // hook relocate_relocs. This just saves space for it.
2192 template<int sh_type, int size, bool big_endian>
2193 class Output_relocatable_relocs : public Output_section_data
2196 Output_relocatable_relocs(Relocatable_relocs* rr)
2197 : Output_section_data(Output_data::default_alignment_for_size(size)),
2202 set_final_data_size();
2204 // Write out the data. There is nothing to do here.
2206 do_write(Output_file*)
2209 // Write to a map file.
2211 do_print_to_mapfile(Mapfile* mapfile) const
2212 { mapfile->print_output_data(this, _("** relocs")); }
2215 // The relocs associated with this input section.
2216 Relocatable_relocs* rr_;
2219 // Handle a GROUP section.
2221 template<int size, bool big_endian>
2222 class Output_data_group : public Output_section_data
2225 // The constructor clears *INPUT_SHNDXES.
2226 Output_data_group(Sized_relobj_file<size, big_endian>* relobj,
2227 section_size_type entry_count,
2228 elfcpp::Elf_Word flags,
2229 std::vector<unsigned int>* input_shndxes);
2232 do_write(Output_file*);
2234 // Write to a map file.
2236 do_print_to_mapfile(Mapfile* mapfile) const
2237 { mapfile->print_output_data(this, _("** group")); }
2239 // Set final data size.
2241 set_final_data_size()
2242 { this->set_data_size((this->input_shndxes_.size() + 1) * 4); }
2245 // The input object.
2246 Sized_relobj_file<size, big_endian>* relobj_;
2247 // The group flag word.
2248 elfcpp::Elf_Word flags_;
2249 // The section indexes of the input sections in this group.
2250 std::vector<unsigned int> input_shndxes_;
2253 // Output_data_got is used to manage a GOT. Each entry in the GOT is
2254 // for one symbol--either a global symbol or a local symbol in an
2255 // object. The target specific code adds entries to the GOT as
2256 // needed. The GOT_SIZE template parameter is the size in bits of a
2257 // GOT entry, typically 32 or 64.
2259 class Output_data_got_base : public Output_section_data_build
2262 Output_data_got_base(uint64_t align)
2263 : Output_section_data_build(align)
2266 Output_data_got_base(off_t data_size, uint64_t align)
2267 : Output_section_data_build(data_size, align)
2270 // Reserve the slot at index I in the GOT.
2272 reserve_slot(unsigned int i)
2273 { this->do_reserve_slot(i); }
2276 // Reserve the slot at index I in the GOT.
2278 do_reserve_slot(unsigned int i) = 0;
2281 template<int got_size, bool big_endian>
2282 class Output_data_got : public Output_data_got_base
2285 typedef typename elfcpp::Elf_types<got_size>::Elf_Addr Valtype;
2288 : Output_data_got_base(Output_data::default_alignment_for_size(got_size)),
2289 entries_(), free_list_()
2292 Output_data_got(off_t data_size)
2293 : Output_data_got_base(data_size,
2294 Output_data::default_alignment_for_size(got_size)),
2295 entries_(), free_list_()
2297 // For an incremental update, we have an existing GOT section.
2298 // Initialize the list of entries and the free list.
2299 this->entries_.resize(data_size / (got_size / 8));
2300 this->free_list_.init(data_size, false);
2303 // Add an entry for a global symbol to the GOT. Return true if this
2304 // is a new GOT entry, false if the symbol was already in the GOT.
2306 add_global(Symbol* gsym, unsigned int got_type);
2308 // Like add_global, but use the PLT offset of the global symbol if
2311 add_global_plt(Symbol* gsym, unsigned int got_type);
2313 // Like add_global, but for a TLS symbol where the value will be
2314 // offset using Target::tls_offset_for_global.
2316 add_global_tls(Symbol* gsym, unsigned int got_type)
2317 { return add_global_plt(gsym, got_type); }
2319 // Add an entry for a global symbol to the GOT, and add a dynamic
2320 // relocation of type R_TYPE for the GOT entry.
2322 add_global_with_rel(Symbol* gsym, unsigned int got_type,
2323 Output_data_reloc_generic* rel_dyn, unsigned int r_type);
2325 // Add a pair of entries for a global symbol to the GOT, and add
2326 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
2328 add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
2329 Output_data_reloc_generic* rel_dyn,
2330 unsigned int r_type_1, unsigned int r_type_2);
2332 // Add an entry for a local symbol to the GOT. This returns true if
2333 // this is a new GOT entry, false if the symbol already has a GOT
2336 add_local(Relobj* object, unsigned int sym_index, unsigned int got_type);
2338 // Like add_local, but use the PLT offset of the local symbol if it
2341 add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type);
2343 // Like add_local, but for a TLS symbol where the value will be
2344 // offset using Target::tls_offset_for_local.
2346 add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type)
2347 { return add_local_plt(object, sym_index, got_type); }
2349 // Add an entry for a local symbol to the GOT, and add a dynamic
2350 // relocation of type R_TYPE for the GOT entry.
2352 add_local_with_rel(Relobj* object, unsigned int sym_index,
2353 unsigned int got_type, Output_data_reloc_generic* rel_dyn,
2354 unsigned int r_type);
2356 // Add a pair of entries for a local symbol to the GOT, and add
2357 // a dynamic relocation of type R_TYPE using the section symbol of
2358 // the output section to which input section SHNDX maps, on the first.
2359 // The first got entry will have a value of zero, the second the
2360 // value of the local symbol.
2362 add_local_pair_with_rel(Relobj* object, unsigned int sym_index,
2363 unsigned int shndx, unsigned int got_type,
2364 Output_data_reloc_generic* rel_dyn,
2365 unsigned int r_type);
2367 // Add a pair of entries for a local symbol to the GOT, and add
2368 // a dynamic relocation of type R_TYPE using STN_UNDEF on the first.
2369 // The first got entry will have a value of zero, the second the
2370 // value of the local symbol offset by Target::tls_offset_for_local.
2372 add_local_tls_pair(Relobj* object, unsigned int sym_index,
2373 unsigned int got_type,
2374 Output_data_reloc_generic* rel_dyn,
2375 unsigned int r_type);
2377 // Add a constant to the GOT. This returns the offset of the new
2378 // entry from the start of the GOT.
2380 add_constant(Valtype constant)
2381 { return this->add_got_entry(Got_entry(constant)); }
2383 // Add a pair of constants to the GOT. This returns the offset of
2384 // the new entry from the start of the GOT.
2386 add_constant_pair(Valtype c1, Valtype c2)
2387 { return this->add_got_entry_pair(Got_entry(c1), Got_entry(c2)); }
2389 // Replace GOT entry I with a new constant.
2391 replace_constant(unsigned int i, Valtype constant)
2393 this->replace_got_entry(i, Got_entry(constant));
2396 // Reserve a slot in the GOT for a local symbol.
2398 reserve_local(unsigned int i, Relobj* object, unsigned int sym_index,
2399 unsigned int got_type);
2401 // Reserve a slot in the GOT for a global symbol.
2403 reserve_global(unsigned int i, Symbol* gsym, unsigned int got_type);
2406 // Write out the GOT table.
2408 do_write(Output_file*);
2410 // Write to a map file.
2412 do_print_to_mapfile(Mapfile* mapfile) const
2413 { mapfile->print_output_data(this, _("** GOT")); }
2415 // Reserve the slot at index I in the GOT.
2417 do_reserve_slot(unsigned int i)
2418 { this->free_list_.remove(i * got_size / 8, (i + 1) * got_size / 8); }
2420 // Return the number of words in the GOT.
2422 num_entries () const
2423 { return this->entries_.size(); }
2425 // Return the offset into the GOT of GOT entry I.
2427 got_offset(unsigned int i) const
2428 { return i * (got_size / 8); }
2431 // This POD class holds a single GOT entry.
2435 // Create a zero entry.
2437 : local_sym_index_(RESERVED_CODE), use_plt_or_tls_offset_(false)
2438 { this->u_.constant = 0; }
2440 // Create a global symbol entry.
2441 Got_entry(Symbol* gsym, bool use_plt_or_tls_offset)
2442 : local_sym_index_(GSYM_CODE),
2443 use_plt_or_tls_offset_(use_plt_or_tls_offset)
2444 { this->u_.gsym = gsym; }
2446 // Create a local symbol entry.
2447 Got_entry(Relobj* object, unsigned int local_sym_index,
2448 bool use_plt_or_tls_offset)
2449 : local_sym_index_(local_sym_index),
2450 use_plt_or_tls_offset_(use_plt_or_tls_offset)
2452 gold_assert(local_sym_index != GSYM_CODE
2453 && local_sym_index != CONSTANT_CODE
2454 && local_sym_index != RESERVED_CODE
2455 && local_sym_index == this->local_sym_index_);
2456 this->u_.object = object;
2459 // Create a constant entry. The constant is a host value--it will
2460 // be swapped, if necessary, when it is written out.
2461 explicit Got_entry(Valtype constant)
2462 : local_sym_index_(CONSTANT_CODE), use_plt_or_tls_offset_(false)
2463 { this->u_.constant = constant; }
2465 // Write the GOT entry to an output view.
2467 write(unsigned int got_indx, unsigned char* pov) const;
2472 GSYM_CODE = 0x7fffffff,
2473 CONSTANT_CODE = 0x7ffffffe,
2474 RESERVED_CODE = 0x7ffffffd
2479 // For a local symbol, the object.
2481 // For a global symbol, the symbol.
2483 // For a constant, the constant.
2486 // For a local symbol, the local symbol index. This is GSYM_CODE
2487 // for a global symbol, or CONSTANT_CODE for a constant.
2488 unsigned int local_sym_index_ : 31;
2489 // Whether to use the PLT offset of the symbol if it has one.
2490 // For TLS symbols, whether to offset the symbol value.
2491 bool use_plt_or_tls_offset_ : 1;
2494 typedef std::vector<Got_entry> Got_entries;
2496 // Create a new GOT entry and return its offset.
2498 add_got_entry(Got_entry got_entry);
2500 // Create a pair of new GOT entries and return the offset of the first.
2502 add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2);
2504 // Replace GOT entry I with a new value.
2506 replace_got_entry(unsigned int i, Got_entry got_entry);
2508 // Return the offset into the GOT of the last entry added.
2510 last_got_offset() const
2511 { return this->got_offset(this->num_entries() - 1); }
2513 // Set the size of the section.
2516 { this->set_current_data_size(this->got_offset(this->num_entries())); }
2518 // The list of GOT entries.
2519 Got_entries entries_;
2521 // List of available regions within the section, for incremental
2523 Free_list free_list_;
2526 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
2529 class Output_data_dynamic : public Output_section_data
2532 Output_data_dynamic(Stringpool* pool)
2533 : Output_section_data(Output_data::default_alignment()),
2534 entries_(), pool_(pool)
2537 // Add a new dynamic entry with a fixed numeric value.
2539 add_constant(elfcpp::DT tag, unsigned int val)
2540 { this->add_entry(Dynamic_entry(tag, val)); }
2542 // Add a new dynamic entry with the address of output data.
2544 add_section_address(elfcpp::DT tag, const Output_data* od)
2545 { this->add_entry(Dynamic_entry(tag, od, false)); }
2547 // Add a new dynamic entry with the address of output data
2548 // plus a constant offset.
2550 add_section_plus_offset(elfcpp::DT tag, const Output_data* od,
2551 unsigned int offset)
2552 { this->add_entry(Dynamic_entry(tag, od, offset)); }
2554 // Add a new dynamic entry with the size of output data.
2556 add_section_size(elfcpp::DT tag, const Output_data* od)
2557 { this->add_entry(Dynamic_entry(tag, od, true)); }
2559 // Add a new dynamic entry with the total size of two output datas.
2561 add_section_size(elfcpp::DT tag, const Output_data* od,
2562 const Output_data* od2)
2563 { this->add_entry(Dynamic_entry(tag, od, od2)); }
2565 // Add a new dynamic entry with the address of a symbol.
2567 add_symbol(elfcpp::DT tag, const Symbol* sym)
2568 { this->add_entry(Dynamic_entry(tag, sym)); }
2570 // Add a new dynamic entry with a string.
2572 add_string(elfcpp::DT tag, const char* str)
2573 { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); }
2576 add_string(elfcpp::DT tag, const std::string& str)
2577 { this->add_string(tag, str.c_str()); }
2579 // Add a new dynamic entry with custom value.
2581 add_custom(elfcpp::DT tag)
2582 { this->add_entry(Dynamic_entry(tag)); }
2585 // Adjust the output section to set the entry size.
2587 do_adjust_output_section(Output_section*);
2589 // Set the final data size.
2591 set_final_data_size();
2593 // Write out the dynamic entries.
2595 do_write(Output_file*);
2597 // Write to a map file.
2599 do_print_to_mapfile(Mapfile* mapfile) const
2600 { mapfile->print_output_data(this, _("** dynamic")); }
2603 // This POD class holds a single dynamic entry.
2607 // Create an entry with a fixed numeric value.
2608 Dynamic_entry(elfcpp::DT tag, unsigned int val)
2609 : tag_(tag), offset_(DYNAMIC_NUMBER)
2610 { this->u_.val = val; }
2612 // Create an entry with the size or address of a section.
2613 Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size)
2615 offset_(section_size
2616 ? DYNAMIC_SECTION_SIZE
2617 : DYNAMIC_SECTION_ADDRESS)
2623 // Create an entry with the size of two sections.
2624 Dynamic_entry(elfcpp::DT tag, const Output_data* od, const Output_data* od2)
2626 offset_(DYNAMIC_SECTION_SIZE)
2632 // Create an entry with the address of a section plus a constant offset.
2633 Dynamic_entry(elfcpp::DT tag, const Output_data* od, unsigned int offset)
2636 { this->u_.od = od; }
2638 // Create an entry with the address of a symbol.
2639 Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
2640 : tag_(tag), offset_(DYNAMIC_SYMBOL)
2641 { this->u_.sym = sym; }
2643 // Create an entry with a string.
2644 Dynamic_entry(elfcpp::DT tag, const char* str)
2645 : tag_(tag), offset_(DYNAMIC_STRING)
2646 { this->u_.str = str; }
2648 // Create an entry with a custom value.
2649 Dynamic_entry(elfcpp::DT tag)
2650 : tag_(tag), offset_(DYNAMIC_CUSTOM)
2653 // Return the tag of this entry.
2656 { return this->tag_; }
2658 // Write the dynamic entry to an output view.
2659 template<int size, bool big_endian>
2661 write(unsigned char* pov, const Stringpool*) const;
2664 // Classification is encoded in the OFFSET field.
2668 DYNAMIC_SECTION_ADDRESS = 0,
2670 DYNAMIC_NUMBER = -1U,
2672 DYNAMIC_SECTION_SIZE = -2U,
2674 DYNAMIC_SYMBOL = -3U,
2676 DYNAMIC_STRING = -4U,
2678 DYNAMIC_CUSTOM = -5U
2679 // Any other value indicates a section address plus OFFSET.
2684 // For DYNAMIC_NUMBER.
2686 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
2687 const Output_data* od;
2688 // For DYNAMIC_SYMBOL.
2690 // For DYNAMIC_STRING.
2693 // For DYNAMIC_SYMBOL with two sections.
2694 const Output_data* od2;
2697 // The type of entry (Classification) or offset within a section.
2698 unsigned int offset_;
2701 // Add an entry to the list.
2703 add_entry(const Dynamic_entry& entry)
2704 { this->entries_.push_back(entry); }
2706 // Sized version of write function.
2707 template<int size, bool big_endian>
2709 sized_write(Output_file* of);
2711 // The type of the list of entries.
2712 typedef std::vector<Dynamic_entry> Dynamic_entries;
2715 Dynamic_entries entries_;
2716 // The pool used for strings.
2720 // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
2721 // which may be required if the object file has more than
2722 // SHN_LORESERVE sections.
2724 class Output_symtab_xindex : public Output_section_data
2727 Output_symtab_xindex(size_t symcount)
2728 : Output_section_data(symcount * 4, 4, true),
2732 // Add an entry: symbol number SYMNDX has section SHNDX.
2734 add(unsigned int symndx, unsigned int shndx)
2735 { this->entries_.push_back(std::make_pair(symndx, shndx)); }
2739 do_write(Output_file*);
2741 // Write to a map file.
2743 do_print_to_mapfile(Mapfile* mapfile) const
2744 { mapfile->print_output_data(this, _("** symtab xindex")); }
2747 template<bool big_endian>
2749 endian_do_write(unsigned char*);
2751 // It is likely that most symbols will not require entries. Rather
2752 // than keep a vector for all symbols, we keep pairs of symbol index
2753 // and section index.
2754 typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries;
2756 // The entries we need.
2757 Xindex_entries entries_;
2760 // A relaxed input section.
2761 class Output_relaxed_input_section : public Output_section_data_build
2764 // We would like to call relobj->section_addralign(shndx) to get the
2765 // alignment but we do not want the constructor to fail. So callers
2766 // are repsonsible for ensuring that.
2767 Output_relaxed_input_section(Relobj* relobj, unsigned int shndx,
2769 : Output_section_data_build(addralign), relobj_(relobj), shndx_(shndx)
2772 // Return the Relobj of this relaxed input section.
2775 { return this->relobj_; }
2777 // Return the section index of this relaxed input section.
2780 { return this->shndx_; }
2784 set_relobj(Relobj* relobj)
2785 { this->relobj_ = relobj; }
2788 set_shndx(unsigned int shndx)
2789 { this->shndx_ = shndx; }
2793 unsigned int shndx_;
2796 // This class describes properties of merge data sections. It is used
2797 // as a key type for maps.
2798 class Merge_section_properties
2801 Merge_section_properties(bool is_string, uint64_t entsize,
2803 : is_string_(is_string), entsize_(entsize), addralign_(addralign)
2806 // Whether this equals to another Merge_section_properties MSP.
2808 eq(const Merge_section_properties& msp) const
2810 return ((this->is_string_ == msp.is_string_)
2811 && (this->entsize_ == msp.entsize_)
2812 && (this->addralign_ == msp.addralign_));
2815 // Compute a hash value for this using 64-bit FNV-1a hash.
2819 uint64_t h = 14695981039346656037ULL; // FNV offset basis.
2820 uint64_t prime = 1099511628211ULL;
2821 h = (h ^ static_cast<uint64_t>(this->is_string_)) * prime;
2822 h = (h ^ static_cast<uint64_t>(this->entsize_)) * prime;
2823 h = (h ^ static_cast<uint64_t>(this->addralign_)) * prime;
2827 // Functors for associative containers.
2831 operator()(const Merge_section_properties& msp1,
2832 const Merge_section_properties& msp2) const
2833 { return msp1.eq(msp2); }
2839 operator()(const Merge_section_properties& msp) const
2840 { return msp.hash_value(); }
2844 // Whether this merge data section is for strings.
2846 // Entsize of this merge data section.
2848 // Address alignment.
2849 uint64_t addralign_;
2852 // This class is used to speed up look up of special input sections in an
2855 class Output_section_lookup_maps
2858 Output_section_lookup_maps()
2859 : is_valid_(true), merge_sections_by_properties_(),
2860 relaxed_input_sections_by_id_()
2863 // Whether the maps are valid.
2866 { return this->is_valid_; }
2868 // Invalidate the maps.
2871 { this->is_valid_ = false; }
2877 this->merge_sections_by_properties_.clear();
2878 this->relaxed_input_sections_by_id_.clear();
2879 // A cleared map is valid.
2880 this->is_valid_ = true;
2883 // Find a merge section by merge section properties. Return NULL if none
2886 find_merge_section(const Merge_section_properties& msp) const
2888 gold_assert(this->is_valid_);
2889 Merge_sections_by_properties::const_iterator p =
2890 this->merge_sections_by_properties_.find(msp);
2891 return p != this->merge_sections_by_properties_.end() ? p->second : NULL;
2894 // Add a merge section pointed by POMB with properties MSP.
2896 add_merge_section(const Merge_section_properties& msp,
2897 Output_merge_base* pomb)
2899 std::pair<Merge_section_properties, Output_merge_base*> value(msp, pomb);
2900 std::pair<Merge_sections_by_properties::iterator, bool> result =
2901 this->merge_sections_by_properties_.insert(value);
2902 gold_assert(result.second);
2905 // Find a relaxed input section of OBJECT with index SHNDX.
2906 Output_relaxed_input_section*
2907 find_relaxed_input_section(const Relobj* object, unsigned int shndx) const
2909 gold_assert(this->is_valid_);
2910 Relaxed_input_sections_by_id::const_iterator p =
2911 this->relaxed_input_sections_by_id_.find(Const_section_id(object, shndx));
2912 return p != this->relaxed_input_sections_by_id_.end() ? p->second : NULL;
2915 // Add a relaxed input section pointed by POMB and whose original input
2916 // section is in OBJECT with index SHNDX.
2918 add_relaxed_input_section(const Relobj* relobj, unsigned int shndx,
2919 Output_relaxed_input_section* poris)
2921 Const_section_id csid(relobj, shndx);
2922 std::pair<Const_section_id, Output_relaxed_input_section*>
2924 std::pair<Relaxed_input_sections_by_id::iterator, bool> result =
2925 this->relaxed_input_sections_by_id_.insert(value);
2926 gold_assert(result.second);
2930 typedef Unordered_map<Merge_section_properties, Output_merge_base*,
2931 Merge_section_properties::hash,
2932 Merge_section_properties::equal_to>
2933 Merge_sections_by_properties;
2935 typedef Unordered_map<Const_section_id, Output_relaxed_input_section*,
2936 Const_section_id_hash>
2937 Relaxed_input_sections_by_id;
2939 // Whether this is valid
2941 // Merge sections by merge section properties.
2942 Merge_sections_by_properties merge_sections_by_properties_;
2943 // Relaxed sections by section IDs.
2944 Relaxed_input_sections_by_id relaxed_input_sections_by_id_;
2947 // This abstract base class defines the interface for the
2948 // types of methods used to fill free space left in an output
2949 // section during an incremental link. These methods are used
2950 // to insert dummy compilation units into debug info so that
2951 // debug info consumers can scan the debug info serially.
2957 : is_big_endian_(parameters->target().is_big_endian())
2964 // Return the smallest size chunk of free space that can be
2965 // filled with a dummy compilation unit.
2967 minimum_hole_size() const
2968 { return this->do_minimum_hole_size(); }
2970 // Write a fill pattern of length LEN at offset OFF in the file.
2972 write(Output_file* of, off_t off, size_t len) const
2973 { this->do_write(of, off, len); }
2977 do_minimum_hole_size() const = 0;
2980 do_write(Output_file* of, off_t off, size_t len) const = 0;
2983 is_big_endian() const
2984 { return this->is_big_endian_; }
2987 bool is_big_endian_;
2990 // Fill method that introduces a dummy compilation unit in
2991 // a .debug_info or .debug_types section.
2993 class Output_fill_debug_info : public Output_fill
2996 Output_fill_debug_info(bool is_debug_types)
2997 : is_debug_types_(is_debug_types)
3002 do_minimum_hole_size() const;
3005 do_write(Output_file* of, off_t off, size_t len) const;
3008 // Version of the header.
3009 static const int version = 4;
3010 // True if this is a .debug_types section.
3011 bool is_debug_types_;
3014 // Fill method that introduces a dummy compilation unit in
3015 // a .debug_line section.
3017 class Output_fill_debug_line : public Output_fill
3020 Output_fill_debug_line()
3025 do_minimum_hole_size() const;
3028 do_write(Output_file* of, off_t off, size_t len) const;
3031 // Version of the header. We write a DWARF-3 header because it's smaller
3032 // and many tools have not yet been updated to understand the DWARF-4 header.
3033 static const int version = 3;
3034 // Length of the portion of the header that follows the header_length
3035 // field. This includes the following fields:
3036 // minimum_instruction_length, default_is_stmt, line_base, line_range,
3037 // opcode_base, standard_opcode_lengths[], include_directories, filenames.
3038 // The standard_opcode_lengths array is 12 bytes long, and the
3039 // include_directories and filenames fields each contain only a single
3041 static const size_t header_length = 19;
3044 // An output section. We don't expect to have too many output
3045 // sections, so we don't bother to do a template on the size.
3047 class Output_section : public Output_data
3050 // Create an output section, giving the name, type, and flags.
3051 Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
3052 virtual ~Output_section();
3054 // Add a new input section SHNDX, named NAME, with header SHDR, from
3055 // object OBJECT. RELOC_SHNDX is the index of a relocation section
3056 // which applies to this section, or 0 if none, or -1 if more than
3057 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
3058 // in a linker script; in that case we need to keep track of input
3059 // sections associated with an output section. Return the offset
3060 // within the output section.
3061 template<int size, bool big_endian>
3063 add_input_section(Layout* layout, Sized_relobj_file<size, big_endian>* object,
3064 unsigned int shndx, const char* name,
3065 const elfcpp::Shdr<size, big_endian>& shdr,
3066 unsigned int reloc_shndx, bool have_sections_script);
3068 // Add generated data POSD to this output section.
3070 add_output_section_data(Output_section_data* posd);
3072 // Add a relaxed input section PORIS called NAME to this output section
3075 add_relaxed_input_section(Layout* layout,
3076 Output_relaxed_input_section* poris,
3077 const std::string& name);
3079 // Return the section name.
3082 { return this->name_; }
3084 // Return the section type.
3087 { return this->type_; }
3089 // Return the section flags.
3092 { return this->flags_; }
3094 typedef std::map<Section_id, unsigned int> Section_layout_order;
3097 update_section_layout(const Section_layout_order* order_map);
3099 // Update the output section flags based on input section flags.
3101 update_flags_for_input_section(elfcpp::Elf_Xword flags);
3103 // Set the output section flags.
3105 set_flags(elfcpp::Elf_Xword flags)
3106 { this->flags_ = flags; }
3108 // Return the entsize field.
3111 { return this->entsize_; }
3113 // Set the entsize field.
3115 set_entsize(uint64_t v);
3117 // Set the load address.
3119 set_load_address(uint64_t load_address)
3121 this->load_address_ = load_address;
3122 this->has_load_address_ = true;
3125 // Set the link field to the output section index of a section.
3127 set_link_section(const Output_data* od)
3129 gold_assert(this->link_ == 0
3130 && !this->should_link_to_symtab_
3131 && !this->should_link_to_dynsym_);
3132 this->link_section_ = od;
3135 // Set the link field to a constant.
3137 set_link(unsigned int v)
3139 gold_assert(this->link_section_ == NULL
3140 && !this->should_link_to_symtab_
3141 && !this->should_link_to_dynsym_);
3145 // Record that this section should link to the normal symbol table.
3147 set_should_link_to_symtab()
3149 gold_assert(this->link_section_ == NULL
3151 && !this->should_link_to_dynsym_);
3152 this->should_link_to_symtab_ = true;
3155 // Record that this section should link to the dynamic symbol table.
3157 set_should_link_to_dynsym()
3159 gold_assert(this->link_section_ == NULL
3161 && !this->should_link_to_symtab_);
3162 this->should_link_to_dynsym_ = true;
3165 // Return the info field.
3169 gold_assert(this->info_section_ == NULL
3170 && this->info_symndx_ == NULL);
3174 // Set the info field to the output section index of a section.
3176 set_info_section(const Output_section* os)
3178 gold_assert((this->info_section_ == NULL
3179 || (this->info_section_ == os
3180 && this->info_uses_section_index_))
3181 && this->info_symndx_ == NULL
3182 && this->info_ == 0);
3183 this->info_section_ = os;
3184 this->info_uses_section_index_= true;
3187 // Set the info field to the symbol table index of a symbol.
3189 set_info_symndx(const Symbol* sym)
3191 gold_assert(this->info_section_ == NULL
3192 && (this->info_symndx_ == NULL
3193 || this->info_symndx_ == sym)
3194 && this->info_ == 0);
3195 this->info_symndx_ = sym;
3198 // Set the info field to the symbol table index of a section symbol.
3200 set_info_section_symndx(const Output_section* os)
3202 gold_assert((this->info_section_ == NULL
3203 || (this->info_section_ == os
3204 && !this->info_uses_section_index_))
3205 && this->info_symndx_ == NULL
3206 && this->info_ == 0);
3207 this->info_section_ = os;
3208 this->info_uses_section_index_ = false;
3211 // Set the info field to a constant.
3213 set_info(unsigned int v)
3215 gold_assert(this->info_section_ == NULL
3216 && this->info_symndx_ == NULL
3217 && (this->info_ == 0
3218 || this->info_ == v));
3222 // Set the addralign field.
3224 set_addralign(uint64_t v)
3225 { this->addralign_ = v; }
3228 checkpoint_set_addralign(uint64_t val)
3230 if (this->checkpoint_ != NULL)
3231 this->checkpoint_->set_addralign(val);
3234 // Whether the output section index has been set.
3236 has_out_shndx() const
3237 { return this->out_shndx_ != -1U; }
3239 // Indicate that we need a symtab index.
3241 set_needs_symtab_index()
3242 { this->needs_symtab_index_ = true; }
3244 // Return whether we need a symtab index.
3246 needs_symtab_index() const
3247 { return this->needs_symtab_index_; }
3249 // Get the symtab index.
3251 symtab_index() const
3253 gold_assert(this->symtab_index_ != 0);
3254 return this->symtab_index_;
3257 // Set the symtab index.
3259 set_symtab_index(unsigned int index)
3261 gold_assert(index != 0);
3262 this->symtab_index_ = index;
3265 // Indicate that we need a dynsym index.
3267 set_needs_dynsym_index()
3268 { this->needs_dynsym_index_ = true; }
3270 // Return whether we need a dynsym index.
3272 needs_dynsym_index() const
3273 { return this->needs_dynsym_index_; }
3275 // Get the dynsym index.
3277 dynsym_index() const
3279 gold_assert(this->dynsym_index_ != 0);
3280 return this->dynsym_index_;
3283 // Set the dynsym index.
3285 set_dynsym_index(unsigned int index)
3287 gold_assert(index != 0);
3288 this->dynsym_index_ = index;
3291 // Sort the attached input sections.
3293 sort_attached_input_sections();
3295 // Return whether the input sections sections attachd to this output
3296 // section may require sorting. This is used to handle constructor
3297 // priorities compatibly with GNU ld.
3299 may_sort_attached_input_sections() const
3300 { return this->may_sort_attached_input_sections_; }
3302 // Record that the input sections attached to this output section
3303 // may require sorting.
3305 set_may_sort_attached_input_sections()
3306 { this->may_sort_attached_input_sections_ = true; }
3308 // Returns true if input sections must be sorted according to the
3309 // order in which their name appear in the --section-ordering-file.
3311 input_section_order_specified()
3312 { return this->input_section_order_specified_; }
3314 // Record that input sections must be sorted as some of their names
3315 // match the patterns specified through --section-ordering-file.
3317 set_input_section_order_specified()
3318 { this->input_section_order_specified_ = true; }
3320 // Return whether the input sections attached to this output section
3321 // require sorting. This is used to handle constructor priorities
3322 // compatibly with GNU ld.
3324 must_sort_attached_input_sections() const
3325 { return this->must_sort_attached_input_sections_; }
3327 // Record that the input sections attached to this output section
3330 set_must_sort_attached_input_sections()
3331 { this->must_sort_attached_input_sections_ = true; }
3333 // Get the order in which this section appears in the PT_LOAD output
3335 Output_section_order
3337 { return this->order_; }
3339 // Set the order for this section.
3341 set_order(Output_section_order order)
3342 { this->order_ = order; }
3344 // Return whether this section holds relro data--data which has
3345 // dynamic relocations but which may be marked read-only after the
3346 // dynamic relocations have been completed.
3349 { return this->is_relro_; }
3351 // Record that this section holds relro data.
3354 { this->is_relro_ = true; }
3356 // Record that this section does not hold relro data.
3359 { this->is_relro_ = false; }
3361 // True if this is a small section: a section which holds small
3364 is_small_section() const
3365 { return this->is_small_section_; }
3367 // Record that this is a small section.
3369 set_is_small_section()
3370 { this->is_small_section_ = true; }
3372 // True if this is a large section: a section which holds large
3375 is_large_section() const
3376 { return this->is_large_section_; }
3378 // Record that this is a large section.
3380 set_is_large_section()
3381 { this->is_large_section_ = true; }
3383 // True if this is a large data (not BSS) section.
3385 is_large_data_section()
3386 { return this->is_large_section_ && this->type_ != elfcpp::SHT_NOBITS; }
3388 // Return whether this section should be written after all the input
3389 // sections are complete.
3391 after_input_sections() const
3392 { return this->after_input_sections_; }
3394 // Record that this section should be written after all the input
3395 // sections are complete.
3397 set_after_input_sections()
3398 { this->after_input_sections_ = true; }
3400 // Return whether this section requires postprocessing after all
3401 // relocations have been applied.
3403 requires_postprocessing() const
3404 { return this->requires_postprocessing_; }
3407 is_unique_segment() const
3408 { return this->is_unique_segment_; }
3411 set_is_unique_segment()
3412 { this->is_unique_segment_ = true; }
3414 uint64_t extra_segment_flags() const
3415 { return this->extra_segment_flags_; }
3418 set_extra_segment_flags(uint64_t flags)
3419 { this->extra_segment_flags_ = flags; }
3421 uint64_t segment_alignment() const
3422 { return this->segment_alignment_; }
3425 set_segment_alignment(uint64_t align)
3426 { this->segment_alignment_ = align; }
3428 // If a section requires postprocessing, return the buffer to use.
3430 postprocessing_buffer() const
3432 gold_assert(this->postprocessing_buffer_ != NULL);
3433 return this->postprocessing_buffer_;
3436 // If a section requires postprocessing, create the buffer to use.
3438 create_postprocessing_buffer();
3440 // If a section requires postprocessing, this is the size of the
3441 // buffer to which relocations should be applied.
3443 postprocessing_buffer_size() const
3444 { return this->current_data_size_for_child(); }
3446 // Modify the section name. This is only permitted for an
3447 // unallocated section, and only before the size has been finalized.
3448 // Otherwise the name will not get into Layout::namepool_.
3450 set_name(const char* newname)
3452 gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0);
3453 gold_assert(!this->is_data_size_valid());
3454 this->name_ = newname;
3457 // Return whether the offset OFFSET in the input section SHNDX in
3458 // object OBJECT is being included in the link.
3460 is_input_address_mapped(const Relobj* object, unsigned int shndx,
3461 off_t offset) const;
3463 // Return the offset within the output section of OFFSET relative to
3464 // the start of input section SHNDX in object OBJECT.
3466 output_offset(const Relobj* object, unsigned int shndx,
3467 section_offset_type offset) const;
3469 // Return the output virtual address of OFFSET relative to the start
3470 // of input section SHNDX in object OBJECT.
3472 output_address(const Relobj* object, unsigned int shndx,
3473 off_t offset) const;
3475 // Look for the merged section for input section SHNDX in object
3476 // OBJECT. If found, return true, and set *ADDR to the address of
3477 // the start of the merged section. This is not necessary the
3478 // output offset corresponding to input offset 0 in the section,
3479 // since the section may be mapped arbitrarily.
3481 find_starting_output_address(const Relobj* object, unsigned int shndx,
3482 uint64_t* addr) const;
3484 // Record that this output section was found in the SECTIONS clause
3485 // of a linker script.
3487 set_found_in_sections_clause()
3488 { this->found_in_sections_clause_ = true; }
3490 // Return whether this output section was found in the SECTIONS
3491 // clause of a linker script.
3493 found_in_sections_clause() const
3494 { return this->found_in_sections_clause_; }
3496 // Write the section header into *OPHDR.
3497 template<int size, bool big_endian>
3499 write_header(const Layout*, const Stringpool*,
3500 elfcpp::Shdr_write<size, big_endian>*) const;
3502 // The next few calls are for linker script support.
3504 // In some cases we need to keep a list of the input sections
3505 // associated with this output section. We only need the list if we
3506 // might have to change the offsets of the input section within the
3507 // output section after we add the input section. The ordinary
3508 // input sections will be written out when we process the object
3509 // file, and as such we don't need to track them here. We do need
3510 // to track Output_section_data objects here. We store instances of
3511 // this structure in a std::vector, so it must be a POD. There can
3512 // be many instances of this structure, so we use a union to save
3518 : shndx_(0), p2align_(0)
3520 this->u1_.data_size = 0;
3521 this->u2_.object = NULL;
3524 // For an ordinary input section.
3525 Input_section(Relobj* object, unsigned int shndx, off_t data_size,
3528 p2align_(ffsll(static_cast<long long>(addralign))),
3529 section_order_index_(0)
3531 gold_assert(shndx != OUTPUT_SECTION_CODE
3532 && shndx != MERGE_DATA_SECTION_CODE
3533 && shndx != MERGE_STRING_SECTION_CODE
3534 && shndx != RELAXED_INPUT_SECTION_CODE);
3535 this->u1_.data_size = data_size;
3536 this->u2_.object = object;
3539 // For a non-merge output section.
3540 Input_section(Output_section_data* posd)
3541 : shndx_(OUTPUT_SECTION_CODE), p2align_(0),
3542 section_order_index_(0)
3544 this->u1_.data_size = 0;
3545 this->u2_.posd = posd;
3548 // For a merge section.
3549 Input_section(Output_section_data* posd, bool is_string, uint64_t entsize)
3551 ? MERGE_STRING_SECTION_CODE
3552 : MERGE_DATA_SECTION_CODE),
3554 section_order_index_(0)
3556 this->u1_.entsize = entsize;
3557 this->u2_.posd = posd;
3560 // For a relaxed input section.
3561 Input_section(Output_relaxed_input_section* psection)
3562 : shndx_(RELAXED_INPUT_SECTION_CODE), p2align_(0),
3563 section_order_index_(0)
3565 this->u1_.data_size = 0;
3566 this->u2_.poris = psection;
3570 section_order_index() const
3572 return this->section_order_index_;
3576 set_section_order_index(unsigned int number)
3578 this->section_order_index_ = number;
3581 // The required alignment.
3585 if (this->p2align_ != 0)
3586 return static_cast<uint64_t>(1) << (this->p2align_ - 1);
3587 else if (!this->is_input_section())
3588 return this->u2_.posd->addralign();
3593 // Set the required alignment, which must be either 0 or a power of 2.
3594 // For input sections that are sub-classes of Output_section_data, a
3595 // alignment of zero means asking the underlying object for alignment.
3597 set_addralign(uint64_t addralign)
3603 gold_assert((addralign & (addralign - 1)) == 0);
3604 this->p2align_ = ffsll(static_cast<long long>(addralign));
3608 // Return the current required size, without finalization.
3610 current_data_size() const;
3612 // Return the required size.
3616 // Whether this is an input section.
3618 is_input_section() const
3620 return (this->shndx_ != OUTPUT_SECTION_CODE
3621 && this->shndx_ != MERGE_DATA_SECTION_CODE
3622 && this->shndx_ != MERGE_STRING_SECTION_CODE
3623 && this->shndx_ != RELAXED_INPUT_SECTION_CODE);
3626 // Return whether this is a merge section which matches the
3629 is_merge_section(bool is_string, uint64_t entsize,
3630 uint64_t addralign) const
3632 return (this->shndx_ == (is_string
3633 ? MERGE_STRING_SECTION_CODE
3634 : MERGE_DATA_SECTION_CODE)
3635 && this->u1_.entsize == entsize
3636 && this->addralign() == addralign);
3639 // Return whether this is a merge section for some input section.
3641 is_merge_section() const
3643 return (this->shndx_ == MERGE_DATA_SECTION_CODE
3644 || this->shndx_ == MERGE_STRING_SECTION_CODE);
3647 // Return whether this is a relaxed input section.
3649 is_relaxed_input_section() const
3650 { return this->shndx_ == RELAXED_INPUT_SECTION_CODE; }
3652 // Return whether this is a generic Output_section_data.
3654 is_output_section_data() const
3656 return this->shndx_ == OUTPUT_SECTION_CODE;
3659 // Return the object for an input section.
3663 // Return the input section index for an input section.
3667 // For non-input-sections, return the associated Output_section_data
3669 Output_section_data*
3670 output_section_data() const
3672 gold_assert(!this->is_input_section());
3673 return this->u2_.posd;
3676 // For a merge section, return the Output_merge_base pointer.
3678 output_merge_base() const
3680 gold_assert(this->is_merge_section());
3681 return this->u2_.pomb;
3684 // Return the Output_relaxed_input_section object.
3685 Output_relaxed_input_section*
3686 relaxed_input_section() const
3688 gold_assert(this->is_relaxed_input_section());
3689 return this->u2_.poris;
3692 // Set the output section.
3694 set_output_section(Output_section* os)
3696 gold_assert(!this->is_input_section());
3697 Output_section_data* posd =
3698 this->is_relaxed_input_section() ? this->u2_.poris : this->u2_.posd;
3699 posd->set_output_section(os);
3702 // Set the address and file offset. This is called during
3703 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
3704 // the enclosing section.
3706 set_address_and_file_offset(uint64_t address, off_t file_offset,
3707 off_t section_file_offset);
3709 // Reset the address and file offset.
3711 reset_address_and_file_offset();
3713 // Finalize the data size.
3715 finalize_data_size();
3717 // Add an input section, for SHF_MERGE sections.
3719 add_input_section(Relobj* object, unsigned int shndx)
3721 gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE
3722 || this->shndx_ == MERGE_STRING_SECTION_CODE);
3723 return this->u2_.posd->add_input_section(object, shndx);
3726 // Given an input OBJECT, an input section index SHNDX within that
3727 // object, and an OFFSET relative to the start of that input
3728 // section, return whether or not the output offset is known. If
3729 // this function returns true, it sets *POUTPUT to the offset in
3730 // the output section, relative to the start of the input section
3731 // in the output section. *POUTPUT may be different from OFFSET
3732 // for a merged section.
3734 output_offset(const Relobj* object, unsigned int shndx,
3735 section_offset_type offset,
3736 section_offset_type* poutput) const;
3738 // Write out the data. This does nothing for an input section.
3740 write(Output_file*);
3742 // Write the data to a buffer. This does nothing for an input
3745 write_to_buffer(unsigned char*);
3747 // Print to a map file.
3749 print_to_mapfile(Mapfile*) const;
3751 // Print statistics about merge sections to stderr.
3753 print_merge_stats(const char* section_name)
3755 if (this->shndx_ == MERGE_DATA_SECTION_CODE
3756 || this->shndx_ == MERGE_STRING_SECTION_CODE)
3757 this->u2_.posd->print_merge_stats(section_name);
3761 // Code values which appear in shndx_. If the value is not one of
3762 // these codes, it is the input section index in the object file.
3765 // An Output_section_data.
3766 OUTPUT_SECTION_CODE = -1U,
3767 // An Output_section_data for an SHF_MERGE section with
3768 // SHF_STRINGS not set.
3769 MERGE_DATA_SECTION_CODE = -2U,
3770 // An Output_section_data for an SHF_MERGE section with
3772 MERGE_STRING_SECTION_CODE = -3U,
3773 // An Output_section_data for a relaxed input section.
3774 RELAXED_INPUT_SECTION_CODE = -4U
3777 // For an ordinary input section, this is the section index in the
3778 // input file. For an Output_section_data, this is
3779 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3780 // MERGE_STRING_SECTION_CODE.
3781 unsigned int shndx_;
3782 // The required alignment, stored as a power of 2.
3783 unsigned int p2align_;
3786 // For an ordinary input section, the section size.
3788 // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
3789 // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
3795 // For an ordinary input section, the object which holds the
3798 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3799 // MERGE_STRING_SECTION_CODE, the data.
3800 Output_section_data* posd;
3801 Output_merge_base* pomb;
3802 // For RELAXED_INPUT_SECTION_CODE, the data.
3803 Output_relaxed_input_section* poris;
3805 // The line number of the pattern it matches in the --section-ordering-file
3806 // file. It is 0 if does not match any pattern.
3807 unsigned int section_order_index_;
3810 // Store the list of input sections for this Output_section into the
3811 // list passed in. This removes the input sections, leaving only
3812 // any Output_section_data elements. This returns the size of those
3813 // Output_section_data elements. ADDRESS is the address of this
3814 // output section. FILL is the fill value to use, in case there are
3815 // any spaces between the remaining Output_section_data elements.
3817 get_input_sections(uint64_t address, const std::string& fill,
3818 std::list<Input_section>*);
3820 // Add a script input section. A script input section can either be
3821 // a plain input section or a sub-class of Output_section_data.
3823 add_script_input_section(const Input_section& input_section);
3825 // Set the current size of the output section.
3827 set_current_data_size(off_t size)
3828 { this->set_current_data_size_for_child(size); }
3830 // End of linker script support.
3832 // Save states before doing section layout.
3833 // This is used for relaxation.
3837 // Restore states prior to section layout.
3845 // Convert existing input sections to relaxed input sections.
3847 convert_input_sections_to_relaxed_sections(
3848 const std::vector<Output_relaxed_input_section*>& sections);
3850 // Find a relaxed input section to an input section in OBJECT
3851 // with index SHNDX. Return NULL if none is found.
3852 const Output_relaxed_input_section*
3853 find_relaxed_input_section(const Relobj* object, unsigned int shndx) const;
3855 // Whether section offsets need adjustment due to relaxation.
3857 section_offsets_need_adjustment() const
3858 { return this->section_offsets_need_adjustment_; }
3860 // Set section_offsets_need_adjustment to be true.
3862 set_section_offsets_need_adjustment()
3863 { this->section_offsets_need_adjustment_ = true; }
3865 // Set section_offsets_need_adjustment to be false.
3867 clear_section_offsets_need_adjustment()
3868 { this->section_offsets_need_adjustment_ = false; }
3870 // Adjust section offsets of input sections in this. This is
3871 // requires if relaxation caused some input sections to change sizes.
3873 adjust_section_offsets();
3875 // Whether this is a NOLOAD section.
3878 { return this->is_noload_; }
3883 { this->is_noload_ = true; }
3885 // Print merge statistics to stderr.
3887 print_merge_stats();
3889 // Set a fixed layout for the section. Used for incremental update links.
3891 set_fixed_layout(uint64_t sh_addr, off_t sh_offset, off_t sh_size,
3892 uint64_t sh_addralign);
3894 // Return TRUE if the section has a fixed layout.
3896 has_fixed_layout() const
3897 { return this->has_fixed_layout_; }
3899 // Set flag to allow patch space for this section. Used for full
3900 // incremental links.
3902 set_is_patch_space_allowed()
3903 { this->is_patch_space_allowed_ = true; }
3905 // Set a fill method to use for free space left in the output section
3906 // during incremental links.
3908 set_free_space_fill(Output_fill* free_space_fill)
3910 this->free_space_fill_ = free_space_fill;
3911 this->free_list_.set_min_hole_size(free_space_fill->minimum_hole_size());
3914 // Reserve space within the fixed layout for the section. Used for
3915 // incremental update links.
3917 reserve(uint64_t sh_offset, uint64_t sh_size);
3919 // Allocate space from the free list for the section. Used for
3920 // incremental update links.
3922 allocate(off_t len, uint64_t addralign);
3924 typedef std::vector<Input_section> Input_section_list;
3926 // Allow access to the input sections.
3927 const Input_section_list&
3928 input_sections() const
3929 { return this->input_sections_; }
3933 { return this->input_sections_; }
3936 // Return the output section--i.e., the object itself.
3941 const Output_section*
3942 do_output_section() const
3945 // Return the section index in the output file.
3947 do_out_shndx() const
3949 gold_assert(this->out_shndx_ != -1U);
3950 return this->out_shndx_;
3953 // Set the output section index.
3955 do_set_out_shndx(unsigned int shndx)
3957 gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
3958 this->out_shndx_ = shndx;
3961 // Update the data size of the Output_section. For a typical
3962 // Output_section, there is nothing to do, but if there are any
3963 // Output_section_data objects we need to do a trial layout
3968 // Set the final data size of the Output_section. For a typical
3969 // Output_section, there is nothing to do, but if there are any
3970 // Output_section_data objects we need to set their final addresses
3973 set_final_data_size();
3975 // Reset the address and file offset.
3977 do_reset_address_and_file_offset();
3979 // Return true if address and file offset already have reset values. In
3980 // other words, calling reset_address_and_file_offset will not change them.
3982 do_address_and_file_offset_have_reset_values() const;
3984 // Write the data to the file. For a typical Output_section, this
3985 // does nothing: the data is written out by calling Object::Relocate
3986 // on each input object. But if there are any Output_section_data
3987 // objects we do need to write them out here.
3989 do_write(Output_file*);
3991 // Return the address alignment--function required by parent class.
3993 do_addralign() const
3994 { return this->addralign_; }
3996 // Return whether there is a load address.
3998 do_has_load_address() const
3999 { return this->has_load_address_; }
4001 // Return the load address.
4003 do_load_address() const
4005 gold_assert(this->has_load_address_);
4006 return this->load_address_;
4009 // Return whether this is an Output_section.
4011 do_is_section() const
4014 // Return whether this is a section of the specified type.
4016 do_is_section_type(elfcpp::Elf_Word type) const
4017 { return this->type_ == type; }
4019 // Return whether the specified section flag is set.
4021 do_is_section_flag_set(elfcpp::Elf_Xword flag) const
4022 { return (this->flags_ & flag) != 0; }
4024 // Set the TLS offset. Called only for SHT_TLS sections.
4026 do_set_tls_offset(uint64_t tls_base);
4028 // Return the TLS offset, relative to the base of the TLS segment.
4029 // Valid only for SHT_TLS sections.
4031 do_tls_offset() const
4032 { return this->tls_offset_; }
4034 // This may be implemented by a child class.
4036 do_finalize_name(Layout*)
4039 // Print to the map file.
4041 do_print_to_mapfile(Mapfile*) const;
4043 // Record that this section requires postprocessing after all
4044 // relocations have been applied. This is called by a child class.
4046 set_requires_postprocessing()
4048 this->requires_postprocessing_ = true;
4049 this->after_input_sections_ = true;
4052 // Write all the data of an Output_section into the postprocessing
4055 write_to_postprocessing_buffer();
4057 // Whether this always keeps an input section list
4059 always_keeps_input_sections() const
4060 { return this->always_keeps_input_sections_; }
4062 // Always keep an input section list.
4064 set_always_keeps_input_sections()
4066 gold_assert(this->current_data_size_for_child() == 0);
4067 this->always_keeps_input_sections_ = true;
4071 // We only save enough information to undo the effects of section layout.
4072 class Checkpoint_output_section
4075 Checkpoint_output_section(uint64_t addralign, elfcpp::Elf_Xword flags,
4076 const Input_section_list& input_sections,
4077 off_t first_input_offset,
4078 bool attached_input_sections_are_sorted)
4079 : addralign_(addralign), flags_(flags),
4080 input_sections_(input_sections),
4081 input_sections_size_(input_sections_.size()),
4082 input_sections_copy_(), first_input_offset_(first_input_offset),
4083 attached_input_sections_are_sorted_(attached_input_sections_are_sorted)
4087 ~Checkpoint_output_section()
4090 // Return the address alignment.
4093 { return this->addralign_; }
4096 set_addralign(uint64_t val)
4097 { this->addralign_ = val; }
4099 // Return the section flags.
4102 { return this->flags_; }
4104 // Return a reference to the input section list copy.
4107 { return &this->input_sections_copy_; }
4109 // Return the size of input_sections at the time when checkpoint is
4112 input_sections_size() const
4113 { return this->input_sections_size_; }
4115 // Whether input sections are copied.
4117 input_sections_saved() const
4118 { return this->input_sections_copy_.size() == this->input_sections_size_; }
4121 first_input_offset() const
4122 { return this->first_input_offset_; }
4125 attached_input_sections_are_sorted() const
4126 { return this->attached_input_sections_are_sorted_; }
4128 // Save input sections.
4130 save_input_sections()
4132 this->input_sections_copy_.reserve(this->input_sections_size_);
4133 this->input_sections_copy_.clear();
4134 Input_section_list::const_iterator p = this->input_sections_.begin();
4135 gold_assert(this->input_sections_size_ >= this->input_sections_.size());
4136 for(size_t i = 0; i < this->input_sections_size_ ; i++, ++p)
4137 this->input_sections_copy_.push_back(*p);
4141 // The section alignment.
4142 uint64_t addralign_;
4143 // The section flags.
4144 elfcpp::Elf_Xword flags_;
4145 // Reference to the input sections to be checkpointed.
4146 const Input_section_list& input_sections_;
4147 // Size of the checkpointed portion of input_sections_;
4148 size_t input_sections_size_;
4149 // Copy of input sections.
4150 Input_section_list input_sections_copy_;
4151 // The offset of the first entry in input_sections_.
4152 off_t first_input_offset_;
4153 // True if the input sections attached to this output section have
4154 // already been sorted.
4155 bool attached_input_sections_are_sorted_;
4158 // This class is used to sort the input sections.
4159 class Input_section_sort_entry;
4161 // This is the sort comparison function for ctors and dtors.
4162 struct Input_section_sort_compare
4165 operator()(const Input_section_sort_entry&,
4166 const Input_section_sort_entry&) const;
4169 // This is the sort comparison function for .init_array and .fini_array.
4170 struct Input_section_sort_init_fini_compare
4173 operator()(const Input_section_sort_entry&,
4174 const Input_section_sort_entry&) const;
4177 // This is the sort comparison function when a section order is specified
4178 // from an input file.
4179 struct Input_section_sort_section_order_index_compare
4182 operator()(const Input_section_sort_entry&,
4183 const Input_section_sort_entry&) const;
4186 // This is the sort comparison function for .text to sort sections with
4187 // prefixes .text.{unlikely,exit,startup,hot} before other sections.
4188 struct Input_section_sort_section_prefix_special_ordering_compare
4191 operator()(const Input_section_sort_entry&,
4192 const Input_section_sort_entry&) const;
4195 // This is the sort comparison function for sorting sections by name.
4196 struct Input_section_sort_section_name_compare
4199 operator()(const Input_section_sort_entry&,
4200 const Input_section_sort_entry&) const;
4203 // Fill data. This is used to fill in data between input sections.
4204 // It is also used for data statements (BYTE, WORD, etc.) in linker
4205 // scripts. When we have to keep track of the input sections, we
4206 // can use an Output_data_const, but we don't want to have to keep
4207 // track of input sections just to implement fills.
4211 Fill(off_t section_offset, off_t length)
4212 : section_offset_(section_offset),
4213 length_(convert_to_section_size_type(length))
4216 // Return section offset.
4218 section_offset() const
4219 { return this->section_offset_; }
4221 // Return fill length.
4224 { return this->length_; }
4227 // The offset within the output section.
4228 off_t section_offset_;
4229 // The length of the space to fill.
4230 section_size_type length_;
4233 typedef std::vector<Fill> Fill_list;
4235 // Map used during relaxation of existing sections. This map
4236 // a section id an input section list index. We assume that
4237 // Input_section_list is a vector.
4238 typedef Unordered_map<Section_id, size_t, Section_id_hash> Relaxation_map;
4240 // Add a new output section by Input_section.
4242 add_output_section_data(Input_section*);
4244 // Add an SHF_MERGE input section. Returns true if the section was
4245 // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
4246 // stores information about the merged input sections.
4248 add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
4249 uint64_t entsize, uint64_t addralign,
4250 bool keeps_input_sections);
4252 // Add an output SHF_MERGE section POSD to this output section.
4253 // IS_STRING indicates whether it is a SHF_STRINGS section, and
4254 // ENTSIZE is the entity size. This returns the entry added to
4257 add_output_merge_section(Output_section_data* posd, bool is_string,
4260 // Find the merge section into which an input section with index SHNDX in
4261 // OBJECT has been added. Return NULL if none found.
4262 const Output_section_data*
4263 find_merge_section(const Relobj* object, unsigned int shndx) const;
4265 // Build a relaxation map.
4267 build_relaxation_map(
4268 const Input_section_list& input_sections,
4270 Relaxation_map* map) const;
4272 // Convert input sections in an input section list into relaxed sections.
4274 convert_input_sections_in_list_to_relaxed_sections(
4275 const std::vector<Output_relaxed_input_section*>& relaxed_sections,
4276 const Relaxation_map& map,
4277 Input_section_list* input_sections);
4279 // Build the lookup maps for merge and relaxed input sections.
4281 build_lookup_maps() const;
4283 // Most of these fields are only valid after layout.
4285 // The name of the section. This will point into a Stringpool.
4287 // The section address is in the parent class.
4288 // The section alignment.
4289 uint64_t addralign_;
4290 // The section entry size.
4292 // The load address. This is only used when using a linker script
4293 // with a SECTIONS clause. The has_load_address_ field indicates
4294 // whether this field is valid.
4295 uint64_t load_address_;
4296 // The file offset is in the parent class.
4297 // Set the section link field to the index of this section.
4298 const Output_data* link_section_;
4299 // If link_section_ is NULL, this is the link field.
4301 // Set the section info field to the index of this section.
4302 const Output_section* info_section_;
4303 // If info_section_ is NULL, set the info field to the symbol table
4304 // index of this symbol.
4305 const Symbol* info_symndx_;
4306 // If info_section_ and info_symndx_ are NULL, this is the section
4309 // The section type.
4310 const elfcpp::Elf_Word type_;
4311 // The section flags.
4312 elfcpp::Elf_Xword flags_;
4313 // The order of this section in the output segment.
4314 Output_section_order order_;
4315 // The section index.
4316 unsigned int out_shndx_;
4317 // If there is a STT_SECTION for this output section in the normal
4318 // symbol table, this is the symbol index. This starts out as zero.
4319 // It is initialized in Layout::finalize() to be the index, or -1U
4320 // if there isn't one.
4321 unsigned int symtab_index_;
4322 // If there is a STT_SECTION for this output section in the dynamic
4323 // symbol table, this is the symbol index. This starts out as zero.
4324 // It is initialized in Layout::finalize() to be the index, or -1U
4325 // if there isn't one.
4326 unsigned int dynsym_index_;
4327 // The input sections. This will be empty in cases where we don't
4328 // need to keep track of them.
4329 Input_section_list input_sections_;
4330 // The offset of the first entry in input_sections_.
4331 off_t first_input_offset_;
4332 // The fill data. This is separate from input_sections_ because we
4333 // often will need fill sections without needing to keep track of
4336 // If the section requires postprocessing, this buffer holds the
4337 // section contents during relocation.
4338 unsigned char* postprocessing_buffer_;
4339 // Whether this output section needs a STT_SECTION symbol in the
4340 // normal symbol table. This will be true if there is a relocation
4342 bool needs_symtab_index_ : 1;
4343 // Whether this output section needs a STT_SECTION symbol in the
4344 // dynamic symbol table. This will be true if there is a dynamic
4345 // relocation which needs it.
4346 bool needs_dynsym_index_ : 1;
4347 // Whether the link field of this output section should point to the
4348 // normal symbol table.
4349 bool should_link_to_symtab_ : 1;
4350 // Whether the link field of this output section should point to the
4351 // dynamic symbol table.
4352 bool should_link_to_dynsym_ : 1;
4353 // Whether this section should be written after all the input
4354 // sections are complete.
4355 bool after_input_sections_ : 1;
4356 // Whether this section requires post processing after all
4357 // relocations have been applied.
4358 bool requires_postprocessing_ : 1;
4359 // Whether an input section was mapped to this output section
4360 // because of a SECTIONS clause in a linker script.
4361 bool found_in_sections_clause_ : 1;
4362 // Whether this section has an explicitly specified load address.
4363 bool has_load_address_ : 1;
4364 // True if the info_section_ field means the section index of the
4365 // section, false if it means the symbol index of the corresponding
4367 bool info_uses_section_index_ : 1;
4368 // True if input sections attached to this output section have to be
4369 // sorted according to a specified order.
4370 bool input_section_order_specified_ : 1;
4371 // True if the input sections attached to this output section may
4373 bool may_sort_attached_input_sections_ : 1;
4374 // True if the input sections attached to this output section must
4376 bool must_sort_attached_input_sections_ : 1;
4377 // True if the input sections attached to this output section have
4378 // already been sorted.
4379 bool attached_input_sections_are_sorted_ : 1;
4380 // True if this section holds relro data.
4382 // True if this is a small section.
4383 bool is_small_section_ : 1;
4384 // True if this is a large section.
4385 bool is_large_section_ : 1;
4386 // Whether code-fills are generated at write.
4387 bool generate_code_fills_at_write_ : 1;
4388 // Whether the entry size field should be zero.
4389 bool is_entsize_zero_ : 1;
4390 // Whether section offsets need adjustment due to relaxation.
4391 bool section_offsets_need_adjustment_ : 1;
4392 // Whether this is a NOLOAD section.
4393 bool is_noload_ : 1;
4394 // Whether this always keeps input section.
4395 bool always_keeps_input_sections_ : 1;
4396 // Whether this section has a fixed layout, for incremental update links.
4397 bool has_fixed_layout_ : 1;
4398 // True if we can add patch space to this section.
4399 bool is_patch_space_allowed_ : 1;
4400 // True if this output section goes into a unique segment.
4401 bool is_unique_segment_ : 1;
4402 // For SHT_TLS sections, the offset of this section relative to the base
4403 // of the TLS segment.
4404 uint64_t tls_offset_;
4405 // Additional segment flags, specified via linker plugin, when mapping some
4406 // input sections to unique segments.
4407 uint64_t extra_segment_flags_;
4408 // Segment alignment specified via linker plugin, when mapping some
4409 // input sections to unique segments.
4410 uint64_t segment_alignment_;
4411 // Saved checkpoint.
4412 Checkpoint_output_section* checkpoint_;
4413 // Fast lookup maps for merged and relaxed input sections.
4414 Output_section_lookup_maps* lookup_maps_;
4415 // List of available regions within the section, for incremental
4417 Free_list free_list_;
4418 // Method for filling chunks of free space.
4419 Output_fill* free_space_fill_;
4420 // Amount added as patch space for incremental linking.
4424 // An output segment. PT_LOAD segments are built from collections of
4425 // output sections. Other segments typically point within PT_LOAD
4426 // segments, and are built directly as needed.
4428 // NOTE: We want to use the copy constructor for this class. During
4429 // relaxation, we may try built the segments multiple times. We do
4430 // that by copying the original segment list before lay-out, doing
4431 // a trial lay-out and roll-back to the saved copied if we need to
4432 // to the lay-out again.
4434 class Output_segment
4437 // Create an output segment, specifying the type and flags.
4438 Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word);
4440 // Return the virtual address.
4443 { return this->vaddr_; }
4445 // Return the physical address.
4448 { return this->paddr_; }
4450 // Return the segment type.
4453 { return this->type_; }
4455 // Return the segment flags.
4458 { return this->flags_; }
4460 // Return the memory size.
4463 { return this->memsz_; }
4465 // Return the file size.
4468 { return this->filesz_; }
4470 // Return the file offset.
4473 { return this->offset_; }
4475 // Whether this is a segment created to hold large data sections.
4477 is_large_data_segment() const
4478 { return this->is_large_data_segment_; }
4480 // Record that this is a segment created to hold large data
4483 set_is_large_data_segment()
4484 { this->is_large_data_segment_ = true; }
4487 is_unique_segment() const
4488 { return this->is_unique_segment_; }
4490 // Mark segment as unique, happens when linker plugins request that
4491 // certain input sections be mapped to unique segments.
4493 set_is_unique_segment()
4494 { this->is_unique_segment_ = true; }
4496 // Return the maximum alignment of the Output_data.
4498 maximum_alignment();
4500 // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
4501 // the segment flags to use.
4503 add_output_section_to_load(Layout* layout, Output_section* os,
4504 elfcpp::Elf_Word seg_flags);
4506 // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
4507 // is the segment flags to use.
4509 add_output_section_to_nonload(Output_section* os,
4510 elfcpp::Elf_Word seg_flags);
4512 // Remove an Output_section from this segment. It is an error if it
4515 remove_output_section(Output_section* os);
4517 // Add an Output_data (which need not be an Output_section) to the
4518 // start of this segment.
4520 add_initial_output_data(Output_data*);
4522 // Return true if this segment has any sections which hold actual
4523 // data, rather than being a BSS section.
4525 has_any_data_sections() const;
4527 // Whether this segment has a dynamic relocs.
4529 has_dynamic_reloc() const;
4531 // Return the first section.
4533 first_section() const;
4535 // Return the address of the first section.
4537 first_section_load_address() const
4539 const Output_section* os = this->first_section();
4540 return os->has_load_address() ? os->load_address() : os->address();
4543 // Return whether the addresses have been set already.
4545 are_addresses_set() const
4546 { return this->are_addresses_set_; }
4548 // Set the addresses.
4550 set_addresses(uint64_t vaddr, uint64_t paddr)
4552 this->vaddr_ = vaddr;
4553 this->paddr_ = paddr;
4554 this->are_addresses_set_ = true;
4557 // Update the flags for the flags of an output section added to this
4560 update_flags_for_output_section(elfcpp::Elf_Xword flags)
4562 // The ELF ABI specifies that a PT_TLS segment should always have
4563 // PF_R as the flags.
4564 if (this->type() != elfcpp::PT_TLS)
4565 this->flags_ |= flags;
4568 // Set the segment flags. This is only used if we have a PHDRS
4569 // clause which explicitly specifies the flags.
4571 set_flags(elfcpp::Elf_Word flags)
4572 { this->flags_ = flags; }
4574 // Set the address of the segment to ADDR and the offset to *POFF
4575 // and set the addresses and offsets of all contained output
4576 // sections accordingly. Set the section indexes of all contained
4577 // output sections starting with *PSHNDX. If RESET is true, first
4578 // reset the addresses of the contained sections. Return the
4579 // address of the immediately following segment. Update *POFF and
4580 // *PSHNDX. This should only be called for a PT_LOAD segment.
4582 set_section_addresses(const Target*, Layout*, bool reset, uint64_t addr,
4583 unsigned int* increase_relro, bool* has_relro,
4584 off_t* poff, unsigned int* pshndx);
4586 // Set the minimum alignment of this segment. This may be adjusted
4587 // upward based on the section alignments.
4589 set_minimum_p_align(uint64_t align)
4591 if (align > this->min_p_align_)
4592 this->min_p_align_ = align;
4595 // Set the offset of this segment based on the section. This should
4596 // only be called for a non-PT_LOAD segment.
4598 set_offset(unsigned int increase);
4600 // Set the TLS offsets of the sections contained in the PT_TLS segment.
4604 // Return the number of output sections.
4606 output_section_count() const;
4608 // Return the section attached to the list segment with the lowest
4609 // load address. This is used when handling a PHDRS clause in a
4612 section_with_lowest_load_address() const;
4614 // Write the segment header into *OPHDR.
4615 template<int size, bool big_endian>
4617 write_header(elfcpp::Phdr_write<size, big_endian>*);
4619 // Write the section headers of associated sections into V.
4620 template<int size, bool big_endian>
4622 write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
4623 unsigned int* pshndx) const;
4625 // Print the output sections in the map file.
4627 print_sections_to_mapfile(Mapfile*) const;
4630 typedef std::vector<Output_data*> Output_data_list;
4632 // Find the maximum alignment in an Output_data_list.
4634 maximum_alignment_list(const Output_data_list*);
4636 // Return whether the first data section is a relro section.
4638 is_first_section_relro() const;
4640 // Set the section addresses in an Output_data_list.
4642 set_section_list_addresses(Layout*, bool reset, Output_data_list*,
4643 uint64_t addr, off_t* poff, unsigned int* pshndx,
4646 // Return the number of Output_sections in an Output_data_list.
4648 output_section_count_list(const Output_data_list*) const;
4650 // Return whether an Output_data_list has a dynamic reloc.
4652 has_dynamic_reloc_list(const Output_data_list*) const;
4654 // Find the section with the lowest load address in an
4655 // Output_data_list.
4657 lowest_load_address_in_list(const Output_data_list* pdl,
4658 Output_section** found,
4659 uint64_t* found_lma) const;
4661 // Find the first and last entries by address.
4663 find_first_and_last_list(const Output_data_list* pdl,
4664 const Output_data** pfirst,
4665 const Output_data** plast) const;
4667 // Write the section headers in the list into V.
4668 template<int size, bool big_endian>
4670 write_section_headers_list(const Layout*, const Stringpool*,
4671 const Output_data_list*, unsigned char* v,
4672 unsigned int* pshdx) const;
4674 // Print a section list to the mapfile.
4676 print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const;
4678 // NOTE: We want to use the copy constructor. Currently, shallow copy
4679 // works for us so we do not need to write our own copy constructor.
4681 // The list of output data attached to this segment.
4682 Output_data_list output_lists_[ORDER_MAX];
4683 // The segment virtual address.
4685 // The segment physical address.
4687 // The size of the segment in memory.
4689 // The maximum section alignment. The is_max_align_known_ field
4690 // indicates whether this has been finalized.
4691 uint64_t max_align_;
4692 // The required minimum value for the p_align field. This is used
4693 // for PT_LOAD segments. Note that this does not mean that
4694 // addresses should be aligned to this value; it means the p_paddr
4695 // and p_vaddr fields must be congruent modulo this value. For
4696 // non-PT_LOAD segments, the dynamic linker works more efficiently
4697 // if the p_align field has the more conventional value, although it
4698 // can align as needed.
4699 uint64_t min_p_align_;
4700 // The offset of the segment data within the file.
4702 // The size of the segment data in the file.
4704 // The segment type;
4705 elfcpp::Elf_Word type_;
4706 // The segment flags.
4707 elfcpp::Elf_Word flags_;
4708 // Whether we have finalized max_align_.
4709 bool is_max_align_known_ : 1;
4710 // Whether vaddr and paddr were set by a linker script.
4711 bool are_addresses_set_ : 1;
4712 // Whether this segment holds large data sections.
4713 bool is_large_data_segment_ : 1;
4714 // Whether this was marked as a unique segment via a linker plugin.
4715 bool is_unique_segment_ : 1;
4718 // This class represents the output file.
4723 Output_file(const char* name);
4725 // Indicate that this is a temporary file which should not be
4729 { this->is_temporary_ = true; }
4731 // Try to open an existing file. Returns false if the file doesn't
4732 // exist, has a size of 0 or can't be mmaped. This method is
4733 // thread-unsafe. If BASE_NAME is not NULL, use the contents of
4734 // that file as the base for incremental linking.
4736 open_base_file(const char* base_name, bool writable);
4738 // Open the output file. FILE_SIZE is the final size of the file.
4739 // If the file already exists, it is deleted/truncated. This method
4740 // is thread-unsafe.
4742 open(off_t file_size);
4744 // Resize the output file. This method is thread-unsafe.
4746 resize(off_t file_size);
4748 // Close the output file (flushing all buffered data) and make sure
4749 // there are no errors. This method is thread-unsafe.
4753 // Return the size of this file.
4756 { return this->file_size_; }
4758 // Return the name of this file.
4761 { return this->name_; }
4763 // We currently always use mmap which makes the view handling quite
4764 // simple. In the future we may support other approaches.
4766 // Write data to the output file.
4768 write(off_t offset, const void* data, size_t len)
4769 { memcpy(this->base_ + offset, data, len); }
4771 // Get a buffer to use to write to the file, given the offset into
4772 // the file and the size.
4774 get_output_view(off_t start, size_t size)
4776 gold_assert(start >= 0
4777 && start + static_cast<off_t>(size) <= this->file_size_);
4778 return this->base_ + start;
4781 // VIEW must have been returned by get_output_view. Write the
4782 // buffer to the file, passing in the offset and the size.
4784 write_output_view(off_t, size_t, unsigned char*)
4787 // Get a read/write buffer. This is used when we want to write part
4788 // of the file, read it in, and write it again.
4790 get_input_output_view(off_t start, size_t size)
4791 { return this->get_output_view(start, size); }
4793 // Write a read/write buffer back to the file.
4795 write_input_output_view(off_t, size_t, unsigned char*)
4798 // Get a read buffer. This is used when we just want to read part
4799 // of the file back it in.
4800 const unsigned char*
4801 get_input_view(off_t start, size_t size)
4802 { return this->get_output_view(start, size); }
4804 // Release a read bfufer.
4806 free_input_view(off_t, size_t, const unsigned char*)
4810 // Map the file into memory or, if that fails, allocate anonymous
4815 // Allocate anonymous memory for the file.
4819 // Map the file into memory.
4821 map_no_anonymous(bool);
4823 // Unmap the file from memory (and flush to disk buffers).
4833 // Base of file mapped into memory.
4834 unsigned char* base_;
4835 // True iff base_ points to a memory buffer rather than an output file.
4836 bool map_is_anonymous_;
4837 // True if base_ was allocated using new rather than mmap.
4838 bool map_is_allocated_;
4839 // True if this is a temporary file which should not be output.
4843 } // End namespace gold.
4845 #endif // !defined(GOLD_OUTPUT_H)