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)