1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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(const 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.
619 const Target
* target_
;
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 // Return whether this is the merge section for the input section
679 // SHNDX in OBJECT. This should return true when output_offset
680 // would return true for some values of OFFSET.
682 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const
683 { return this->do_is_merge_section_for(object
, shndx
); }
685 // Write the contents to a buffer. This is used for sections which
686 // require postprocessing, such as compression.
688 write_to_buffer(unsigned char* buffer
)
689 { this->do_write_to_buffer(buffer
); }
691 // Print merge stats to stderr. This should only be called for
692 // SHF_MERGE sections.
694 print_merge_stats(const char* section_name
)
695 { this->do_print_merge_stats(section_name
); }
698 // The child class must implement do_write.
700 // The child class may implement specific adjustments to the output
703 do_adjust_output_section(Output_section
*)
706 // May be implemented by child class. Return true if the section
709 do_add_input_section(Relobj
*, unsigned int)
710 { gold_unreachable(); }
712 // The child class may implement output_offset.
714 do_output_offset(const Relobj
*, unsigned int, section_offset_type
,
715 section_offset_type
*) const
718 // The child class may implement is_merge_section_for.
720 do_is_merge_section_for(const Relobj
*, unsigned int) const
723 // The child class may implement write_to_buffer. Most child
724 // classes can not appear in a compressed section, and they do not
727 do_write_to_buffer(unsigned char*)
728 { gold_unreachable(); }
730 // Print merge statistics.
732 do_print_merge_stats(const char*)
733 { gold_unreachable(); }
735 // Return the required alignment.
738 { return this->addralign_
; }
740 // Return the output section.
743 { return this->output_section_
; }
745 const Output_section
*
746 do_output_section() const
747 { return this->output_section_
; }
749 // Return the section index of the output section.
751 do_out_shndx() const;
753 // Set the alignment.
755 set_addralign(uint64_t addralign
);
758 // The output section for this section.
759 Output_section
* output_section_
;
760 // The required alignment.
764 // Some Output_section_data classes build up their data step by step,
765 // rather than all at once. This class provides an interface for
768 class Output_section_data_build
: public Output_section_data
771 Output_section_data_build(uint64_t addralign
)
772 : Output_section_data(addralign
)
775 Output_section_data_build(off_t data_size
, uint64_t addralign
)
776 : Output_section_data(data_size
, addralign
, false)
779 // Set the current data size.
781 set_current_data_size(off_t data_size
)
782 { this->set_current_data_size_for_child(data_size
); }
785 // Set the final data size.
787 set_final_data_size()
788 { this->set_data_size(this->current_data_size_for_child()); }
791 // A simple case of Output_data in which we have constant data to
794 class Output_data_const
: public Output_section_data
797 Output_data_const(const std::string
& data
, uint64_t addralign
)
798 : Output_section_data(data
.size(), addralign
, true), data_(data
)
801 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
802 : Output_section_data(len
, addralign
, true), data_(p
, len
)
805 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
806 : Output_section_data(len
, addralign
, true),
807 data_(reinterpret_cast<const char*>(p
), len
)
811 // Write the data to the output file.
813 do_write(Output_file
*);
815 // Write the data to a buffer.
817 do_write_to_buffer(unsigned char* buffer
)
818 { memcpy(buffer
, this->data_
.data(), this->data_
.size()); }
820 // Write to a map file.
822 do_print_to_mapfile(Mapfile
* mapfile
) const
823 { mapfile
->print_output_data(this, _("** fill")); }
829 // Another version of Output_data with constant data, in which the
830 // buffer is allocated by the caller.
832 class Output_data_const_buffer
: public Output_section_data
835 Output_data_const_buffer(const unsigned char* p
, off_t len
,
836 uint64_t addralign
, const char* map_name
)
837 : Output_section_data(len
, addralign
, true),
838 p_(p
), map_name_(map_name
)
842 // Write the data the output file.
844 do_write(Output_file
*);
846 // Write the data to a buffer.
848 do_write_to_buffer(unsigned char* buffer
)
849 { memcpy(buffer
, this->p_
, this->data_size()); }
851 // Write to a map file.
853 do_print_to_mapfile(Mapfile
* mapfile
) const
854 { mapfile
->print_output_data(this, _(this->map_name_
)); }
857 // The data to output.
858 const unsigned char* p_
;
859 // Name to use in a map file. Maps are a rarely used feature, but
860 // the space usage is minor as aren't very many of these objects.
861 const char* map_name_
;
864 // A place holder for a fixed amount of data written out via some
867 class Output_data_fixed_space
: public Output_section_data
870 Output_data_fixed_space(off_t data_size
, uint64_t addralign
,
871 const char* map_name
)
872 : Output_section_data(data_size
, addralign
, true),
877 // Write out the data--the actual data must be written out
880 do_write(Output_file
*)
883 // Write to a map file.
885 do_print_to_mapfile(Mapfile
* mapfile
) const
886 { mapfile
->print_output_data(this, _(this->map_name_
)); }
889 // Name to use in a map file. Maps are a rarely used feature, but
890 // the space usage is minor as aren't very many of these objects.
891 const char* map_name_
;
894 // A place holder for variable sized data written out via some other
897 class Output_data_space
: public Output_section_data_build
900 explicit Output_data_space(uint64_t addralign
, const char* map_name
)
901 : Output_section_data_build(addralign
),
905 explicit Output_data_space(off_t data_size
, uint64_t addralign
,
906 const char* map_name
)
907 : Output_section_data_build(data_size
, addralign
),
911 // Set the alignment.
913 set_space_alignment(uint64_t align
)
914 { this->set_addralign(align
); }
917 // Write out the data--the actual data must be written out
920 do_write(Output_file
*)
923 // Write to a map file.
925 do_print_to_mapfile(Mapfile
* mapfile
) const
926 { mapfile
->print_output_data(this, _(this->map_name_
)); }
929 // Name to use in a map file. Maps are a rarely used feature, but
930 // the space usage is minor as aren't very many of these objects.
931 const char* map_name_
;
934 // Fill fixed space with zeroes. This is just like
935 // Output_data_fixed_space, except that the map name is known.
937 class Output_data_zero_fill
: public Output_section_data
940 Output_data_zero_fill(off_t data_size
, uint64_t addralign
)
941 : Output_section_data(data_size
, addralign
, true)
945 // There is no data to write out.
947 do_write(Output_file
*)
950 // Write to a map file.
952 do_print_to_mapfile(Mapfile
* mapfile
) const
953 { mapfile
->print_output_data(this, "** zero fill"); }
956 // A string table which goes into an output section.
958 class Output_data_strtab
: public Output_section_data
961 Output_data_strtab(Stringpool
* strtab
)
962 : Output_section_data(1), strtab_(strtab
)
966 // This is called to update the section size prior to assigning
967 // the address and file offset.
970 { this->set_final_data_size(); }
972 // This is called to set the address and file offset. Here we make
973 // sure that the Stringpool is finalized.
975 set_final_data_size();
977 // Write out the data.
979 do_write(Output_file
*);
981 // Write the data to a buffer.
983 do_write_to_buffer(unsigned char* buffer
)
984 { this->strtab_
->write_to_buffer(buffer
, this->data_size()); }
986 // Write to a map file.
988 do_print_to_mapfile(Mapfile
* mapfile
) const
989 { mapfile
->print_output_data(this, _("** string table")); }
995 // This POD class is used to represent a single reloc in the output
996 // file. This could be a private class within Output_data_reloc, but
997 // the templatization is complex enough that I broke it out into a
998 // separate class. The class is templatized on either elfcpp::SHT_REL
999 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
1000 // relocation or an ordinary relocation.
1002 // A relocation can be against a global symbol, a local symbol, a
1003 // local section symbol, an output section, or the undefined symbol at
1004 // index 0. We represent the latter by using a NULL global symbol.
1006 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1009 template<bool dynamic
, int size
, bool big_endian
>
1010 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1013 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1014 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1016 static const Address invalid_address
= static_cast<Address
>(0) - 1;
1018 // An uninitialized entry. We need this because we want to put
1019 // instances of this class into an STL container.
1021 : local_sym_index_(INVALID_CODE
)
1024 // We have a bunch of different constructors. They come in pairs
1025 // depending on how the address of the relocation is specified. It
1026 // can either be an offset in an Output_data or an offset in an
1029 // A reloc against a global symbol.
1031 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1032 Address address
, bool is_relative
, bool is_symbolless
,
1033 bool use_plt_offset
);
1035 Output_reloc(Symbol
* gsym
, unsigned int type
,
1036 Sized_relobj
<size
, big_endian
>* relobj
,
1037 unsigned int shndx
, Address address
, bool is_relative
,
1038 bool is_symbolless
, bool use_plt_offset
);
1040 // A reloc against a local symbol or local section symbol.
1042 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1043 unsigned int local_sym_index
, unsigned int type
,
1044 Output_data
* od
, Address address
, bool is_relative
,
1045 bool is_symbolless
, bool is_section_symbol
,
1046 bool use_plt_offset
);
1048 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1049 unsigned int local_sym_index
, unsigned int type
,
1050 unsigned int shndx
, Address address
, bool is_relative
,
1051 bool is_symbolless
, bool is_section_symbol
,
1052 bool use_plt_offset
);
1054 // A reloc against the STT_SECTION symbol of an output section.
1056 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1057 Address address
, bool is_relative
);
1059 Output_reloc(Output_section
* os
, unsigned int type
,
1060 Sized_relobj
<size
, big_endian
>* relobj
, unsigned int shndx
,
1061 Address address
, bool is_relative
);
1063 // An absolute or relative relocation with no symbol.
1065 Output_reloc(unsigned int type
, Output_data
* od
, Address address
,
1068 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1069 unsigned int shndx
, Address address
, bool is_relative
);
1071 // A target specific relocation. The target will be called to get
1072 // the symbol index, passing ARG. The type and offset will be set
1073 // as for other relocation types.
1075 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1078 Output_reloc(unsigned int type
, void* arg
,
1079 Sized_relobj
<size
, big_endian
>* relobj
,
1080 unsigned int shndx
, Address address
);
1082 // Return the reloc type.
1085 { return this->type_
; }
1087 // Return whether this is a RELATIVE relocation.
1090 { return this->is_relative_
; }
1092 // Return whether this is a relocation which should not use
1093 // a symbol, but which obtains its addend from a symbol.
1095 is_symbolless() const
1096 { return this->is_symbolless_
; }
1098 // Return whether this is against a local section symbol.
1100 is_local_section_symbol() const
1102 return (this->local_sym_index_
!= GSYM_CODE
1103 && this->local_sym_index_
!= SECTION_CODE
1104 && this->local_sym_index_
!= INVALID_CODE
1105 && this->local_sym_index_
!= TARGET_CODE
1106 && this->is_section_symbol_
);
1109 // Return whether this is a target specific relocation.
1111 is_target_specific() const
1112 { return this->local_sym_index_
== TARGET_CODE
; }
1114 // Return the argument to pass to the target for a target specific
1119 gold_assert(this->local_sym_index_
== TARGET_CODE
);
1120 return this->u1_
.arg
;
1123 // For a local section symbol, return the offset of the input
1124 // section within the output section. ADDEND is the addend being
1125 // applied to the input section.
1127 local_section_offset(Addend addend
) const;
1129 // Get the value of the symbol referred to by a Rel relocation when
1130 // we are adding the given ADDEND.
1132 symbol_value(Addend addend
) const;
1134 // If this relocation is against an input section, return the
1135 // relocatable object containing the input section.
1136 Sized_relobj
<size
, big_endian
>*
1139 if (this->shndx_
== INVALID_CODE
)
1141 return this->u2_
.relobj
;
1144 // Write the reloc entry to an output view.
1146 write(unsigned char* pov
) const;
1148 // Write the offset and info fields to Write_rel.
1149 template<typename Write_rel
>
1150 void write_rel(Write_rel
*) const;
1152 // This is used when sorting dynamic relocs. Return -1 to sort this
1153 // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
1155 compare(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>& r2
)
1158 // Return whether this reloc should be sorted before the argument
1159 // when sorting dynamic relocs.
1161 sort_before(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>&
1163 { return this->compare(r2
) < 0; }
1166 // Record that we need a dynamic symbol index.
1168 set_needs_dynsym_index();
1170 // Return the symbol index.
1172 get_symbol_index() const;
1174 // Return the output address.
1176 get_address() const;
1178 // Codes for local_sym_index_.
1187 // Invalid uninitialized entry.
1193 // For a local symbol or local section symbol
1194 // (this->local_sym_index_ >= 0), the object. We will never
1195 // generate a relocation against a local symbol in a dynamic
1196 // object; that doesn't make sense. And our callers will always
1197 // be templatized, so we use Sized_relobj here.
1198 Sized_relobj
<size
, big_endian
>* relobj
;
1199 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
1200 // symbol. If this is NULL, it indicates a relocation against the
1201 // undefined 0 symbol.
1203 // For a relocation against an output section
1204 // (this->local_sym_index_ == SECTION_CODE), the output section.
1206 // For a target specific relocation, an argument to pass to the
1212 // If this->shndx_ is not INVALID CODE, the object which holds the
1213 // input section being used to specify the reloc address.
1214 Sized_relobj
<size
, big_endian
>* relobj
;
1215 // If this->shndx_ is INVALID_CODE, the output data being used to
1216 // specify the reloc address. This may be NULL if the reloc
1217 // address is absolute.
1220 // The address offset within the input section or the Output_data.
1222 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
1223 // relocation against an output section, or TARGET_CODE for a target
1224 // specific relocation, or INVALID_CODE for an uninitialized value.
1225 // Otherwise, for a local symbol (this->is_section_symbol_ is
1226 // false), the local symbol index. For a local section symbol
1227 // (this->is_section_symbol_ is true), the section index in the
1229 unsigned int local_sym_index_
;
1230 // The reloc type--a processor specific code.
1231 unsigned int type_
: 28;
1232 // True if the relocation is a RELATIVE relocation.
1233 bool is_relative_
: 1;
1234 // True if the relocation is one which should not use
1235 // a symbol, but which obtains its addend from a symbol.
1236 bool is_symbolless_
: 1;
1237 // True if the relocation is against a section symbol.
1238 bool is_section_symbol_
: 1;
1239 // True if the addend should be the PLT offset.
1240 // (Used only for RELA, but stored here for space.)
1241 bool use_plt_offset_
: 1;
1242 // If the reloc address is an input section in an object, the
1243 // section index. This is INVALID_CODE if the reloc address is
1244 // specified in some other way.
1245 unsigned int shndx_
;
1248 // The SHT_RELA version of Output_reloc<>. This is just derived from
1249 // the SHT_REL version of Output_reloc, but it adds an addend.
1251 template<bool dynamic
, int size
, bool big_endian
>
1252 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1255 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1256 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1258 // An uninitialized entry.
1263 // A reloc against a global symbol.
1265 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1266 Address address
, Addend addend
, bool is_relative
,
1267 bool is_symbolless
, bool use_plt_offset
)
1268 : rel_(gsym
, type
, od
, address
, is_relative
, is_symbolless
,
1273 Output_reloc(Symbol
* gsym
, unsigned int type
,
1274 Sized_relobj
<size
, big_endian
>* relobj
,
1275 unsigned int shndx
, Address address
, Addend addend
,
1276 bool is_relative
, bool is_symbolless
, bool use_plt_offset
)
1277 : rel_(gsym
, type
, relobj
, shndx
, address
, is_relative
,
1278 is_symbolless
, use_plt_offset
), addend_(addend
)
1281 // A reloc against a local symbol.
1283 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1284 unsigned int local_sym_index
, unsigned int type
,
1285 Output_data
* od
, Address address
,
1286 Addend addend
, bool is_relative
,
1287 bool is_symbolless
, bool is_section_symbol
,
1288 bool use_plt_offset
)
1289 : rel_(relobj
, local_sym_index
, type
, od
, address
, is_relative
,
1290 is_symbolless
, is_section_symbol
, use_plt_offset
),
1294 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1295 unsigned int local_sym_index
, unsigned int type
,
1296 unsigned int shndx
, Address address
,
1297 Addend addend
, bool is_relative
,
1298 bool is_symbolless
, bool is_section_symbol
,
1299 bool use_plt_offset
)
1300 : rel_(relobj
, local_sym_index
, type
, shndx
, address
, is_relative
,
1301 is_symbolless
, is_section_symbol
, use_plt_offset
),
1305 // A reloc against the STT_SECTION symbol of an output section.
1307 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1308 Address address
, Addend addend
, bool is_relative
)
1309 : rel_(os
, type
, od
, address
, is_relative
), addend_(addend
)
1312 Output_reloc(Output_section
* os
, unsigned int type
,
1313 Sized_relobj
<size
, big_endian
>* relobj
,
1314 unsigned int shndx
, Address address
, Addend addend
,
1316 : rel_(os
, type
, relobj
, shndx
, address
, is_relative
), addend_(addend
)
1319 // An absolute or relative relocation with no symbol.
1321 Output_reloc(unsigned int type
, Output_data
* od
, Address address
,
1322 Addend addend
, bool is_relative
)
1323 : rel_(type
, od
, address
, is_relative
), addend_(addend
)
1326 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1327 unsigned int shndx
, Address address
, Addend addend
,
1329 : rel_(type
, relobj
, shndx
, address
, is_relative
), addend_(addend
)
1332 // A target specific relocation. The target will be called to get
1333 // the symbol index and the addend, passing ARG. The type and
1334 // offset will be set as for other relocation types.
1336 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1337 Address address
, Addend addend
)
1338 : rel_(type
, arg
, od
, address
), addend_(addend
)
1341 Output_reloc(unsigned int type
, void* arg
,
1342 Sized_relobj
<size
, big_endian
>* relobj
,
1343 unsigned int shndx
, Address address
, Addend addend
)
1344 : rel_(type
, arg
, relobj
, shndx
, address
), addend_(addend
)
1347 // Return whether this is a RELATIVE relocation.
1350 { return this->rel_
.is_relative(); }
1352 // Return whether this is a relocation which should not use
1353 // a symbol, but which obtains its addend from a symbol.
1355 is_symbolless() const
1356 { return this->rel_
.is_symbolless(); }
1358 // If this relocation is against an input section, return the
1359 // relocatable object containing the input section.
1360 Sized_relobj
<size
, big_endian
>*
1362 { return this->rel_
.get_relobj(); }
1364 // Write the reloc entry to an output view.
1366 write(unsigned char* pov
) const;
1368 // Return whether this reloc should be sorted before the argument
1369 // when sorting dynamic relocs.
1371 sort_before(const Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>&
1374 int i
= this->rel_
.compare(r2
.rel_
);
1380 return this->addend_
< r2
.addend_
;
1385 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
1390 // Output_data_reloc_generic is a non-template base class for
1391 // Output_data_reloc_base. This gives the generic code a way to hold
1392 // a pointer to a reloc section.
1394 class Output_data_reloc_generic
: public Output_section_data_build
1397 Output_data_reloc_generic(int size
, bool sort_relocs
)
1398 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1399 relative_reloc_count_(0), sort_relocs_(sort_relocs
)
1402 // Return the number of relative relocs in this section.
1404 relative_reloc_count() const
1405 { return this->relative_reloc_count_
; }
1407 // Whether we should sort the relocs.
1410 { return this->sort_relocs_
; }
1412 // Add a reloc of type TYPE against the global symbol GSYM. The
1413 // relocation applies to the data at offset ADDRESS within OD.
1415 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1416 uint64_t address
, uint64_t addend
) = 0;
1418 // Add a reloc of type TYPE against the global symbol GSYM. The
1419 // relocation applies to data at offset ADDRESS within section SHNDX
1420 // of object file RELOBJ. OD is the associated output section.
1422 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1423 Relobj
* relobj
, unsigned int shndx
, uint64_t address
,
1424 uint64_t addend
) = 0;
1426 // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
1427 // in RELOBJ. The relocation applies to the data at offset ADDRESS
1430 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1431 unsigned int type
, Output_data
* od
, uint64_t address
,
1432 uint64_t addend
) = 0;
1434 // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
1435 // in RELOBJ. The relocation applies to the data at offset ADDRESS
1436 // within section SHNDX of RELOBJ. OD is the associated output
1439 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1440 unsigned int type
, Output_data
* od
, unsigned int shndx
,
1441 uint64_t address
, uint64_t addend
) = 0;
1443 // Add a reloc of type TYPE against the STT_SECTION symbol of the
1444 // output section OS. The relocation applies to the data at offset
1445 // ADDRESS within OD.
1447 add_output_section_generic(Output_section
*os
, unsigned int type
,
1448 Output_data
* od
, uint64_t address
,
1449 uint64_t addend
) = 0;
1451 // Add a reloc of type TYPE against the STT_SECTION symbol of the
1452 // output section OS. The relocation applies to the data at offset
1453 // ADDRESS within section SHNDX of RELOBJ. OD is the associated
1456 add_output_section_generic(Output_section
* os
, unsigned int type
,
1457 Output_data
* od
, Relobj
* relobj
,
1458 unsigned int shndx
, uint64_t address
,
1459 uint64_t addend
) = 0;
1462 // Note that we've added another relative reloc.
1464 bump_relative_reloc_count()
1465 { ++this->relative_reloc_count_
; }
1468 // The number of relative relocs added to this section. This is to
1469 // support DT_RELCOUNT.
1470 size_t relative_reloc_count_
;
1471 // Whether to sort the relocations when writing them out, to make
1472 // the dynamic linker more efficient.
1476 // Output_data_reloc is used to manage a section containing relocs.
1477 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
1478 // indicates whether this is a dynamic relocation or a normal
1479 // relocation. Output_data_reloc_base is a base class.
1480 // Output_data_reloc is the real class, which we specialize based on
1483 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1484 class Output_data_reloc_base
: public Output_data_reloc_generic
1487 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
1488 typedef typename
Output_reloc_type::Address Address
;
1489 static const int reloc_size
=
1490 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
1492 // Construct the section.
1493 Output_data_reloc_base(bool sort_relocs
)
1494 : Output_data_reloc_generic(size
, sort_relocs
)
1498 // Write out the data.
1500 do_write(Output_file
*);
1502 // Set the entry size and the link.
1504 do_adjust_output_section(Output_section
* os
);
1506 // Write to a map file.
1508 do_print_to_mapfile(Mapfile
* mapfile
) const
1510 mapfile
->print_output_data(this,
1512 ? _("** dynamic relocs")
1516 // Add a relocation entry.
1518 add(Output_data
* od
, const Output_reloc_type
& reloc
)
1520 this->relocs_
.push_back(reloc
);
1521 this->set_current_data_size(this->relocs_
.size() * reloc_size
);
1523 od
->add_dynamic_reloc();
1524 if (reloc
.is_relative())
1525 this->bump_relative_reloc_count();
1526 Sized_relobj
<size
, big_endian
>* relobj
= reloc
.get_relobj();
1528 relobj
->add_dyn_reloc(this->relocs_
.size() - 1);
1532 typedef std::vector
<Output_reloc_type
> Relocs
;
1534 // The class used to sort the relocations.
1535 struct Sort_relocs_comparison
1538 operator()(const Output_reloc_type
& r1
, const Output_reloc_type
& r2
) const
1539 { return r1
.sort_before(r2
); }
1542 // The relocations in this section.
1546 // The class which callers actually create.
1548 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1549 class Output_data_reloc
;
1551 // The SHT_REL version of Output_data_reloc.
1553 template<bool dynamic
, int size
, bool big_endian
>
1554 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1555 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1558 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
1562 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1563 typedef typename
Output_reloc_type::Address Address
;
1565 Output_data_reloc(bool sr
)
1566 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>(sr
)
1569 // Add a reloc against a global symbol.
1572 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
1573 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, false, false)); }
1576 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1577 Sized_relobj
<size
, big_endian
>* relobj
,
1578 unsigned int shndx
, Address address
)
1579 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1580 false, false, false)); }
1583 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1584 uint64_t address
, uint64_t addend
)
1586 gold_assert(addend
== 0);
1587 this->add(od
, Output_reloc_type(gsym
, type
, od
,
1588 convert_types
<Address
, uint64_t>(address
),
1589 false, false, false));
1593 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1594 Relobj
* relobj
, unsigned int shndx
, uint64_t address
,
1597 gold_assert(addend
== 0);
1598 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1599 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
1600 this->add(od
, Output_reloc_type(gsym
, type
, sized_relobj
, shndx
,
1601 convert_types
<Address
, uint64_t>(address
),
1602 false, false, false));
1605 // Add a RELATIVE reloc against a global symbol. The final relocation
1606 // will not reference the symbol.
1609 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1611 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, true, true,
1615 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1616 Sized_relobj
<size
, big_endian
>* relobj
,
1617 unsigned int shndx
, Address address
)
1619 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1620 true, true, false));
1623 // Add a global relocation which does not use a symbol for the relocation,
1624 // but which gets its addend from a symbol.
1627 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1628 Output_data
* od
, Address address
)
1629 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, true,
1633 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1635 Sized_relobj
<size
, big_endian
>* relobj
,
1636 unsigned int shndx
, Address address
)
1638 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1639 false, true, false));
1642 // Add a reloc against a local symbol.
1645 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1646 unsigned int local_sym_index
, unsigned int type
,
1647 Output_data
* od
, Address address
)
1649 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1650 address
, false, false, false, false));
1654 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1655 unsigned int local_sym_index
, unsigned int type
,
1656 Output_data
* od
, unsigned int shndx
, Address address
)
1658 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1659 address
, false, false, false, false));
1663 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1664 unsigned int type
, Output_data
* od
, uint64_t address
,
1667 gold_assert(addend
== 0);
1668 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1669 static_cast<Sized_relobj
<size
, big_endian
> *>(relobj
);
1670 this->add(od
, Output_reloc_type(sized_relobj
, local_sym_index
, type
, od
,
1671 convert_types
<Address
, uint64_t>(address
),
1672 false, false, false, false));
1676 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1677 unsigned int type
, Output_data
* od
, unsigned int shndx
,
1678 uint64_t address
, uint64_t addend
)
1680 gold_assert(addend
== 0);
1681 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1682 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
1683 this->add(od
, Output_reloc_type(sized_relobj
, local_sym_index
, type
, shndx
,
1684 convert_types
<Address
, uint64_t>(address
),
1685 false, false, false, false));
1688 // Add a RELATIVE reloc against a local symbol.
1691 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1692 unsigned int local_sym_index
, unsigned int type
,
1693 Output_data
* od
, Address address
)
1695 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1696 address
, true, true, false, false));
1700 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1701 unsigned int local_sym_index
, unsigned int type
,
1702 Output_data
* od
, unsigned int shndx
, Address address
)
1704 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1705 address
, true, true, false, false));
1708 // Add a local relocation which does not use a symbol for the relocation,
1709 // but which gets its addend from a symbol.
1712 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1713 unsigned int local_sym_index
, unsigned int type
,
1714 Output_data
* od
, Address address
)
1716 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1717 address
, false, true, false, false));
1721 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1722 unsigned int local_sym_index
, unsigned int type
,
1723 Output_data
* od
, unsigned int shndx
,
1726 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1727 address
, false, true, false, false));
1730 // Add a reloc against a local section symbol. This will be
1731 // converted into a reloc against the STT_SECTION symbol of the
1735 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1736 unsigned int input_shndx
, unsigned int type
,
1737 Output_data
* od
, Address address
)
1739 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
,
1740 address
, false, false, true, false));
1744 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1745 unsigned int input_shndx
, unsigned int type
,
1746 Output_data
* od
, unsigned int shndx
, Address address
)
1748 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1749 address
, false, false, true, false));
1752 // A reloc against the STT_SECTION symbol of an output section.
1753 // OS is the Output_section that the relocation refers to; OD is
1754 // the Output_data object being relocated.
1757 add_output_section(Output_section
* os
, unsigned int type
,
1758 Output_data
* od
, Address address
)
1759 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, false)); }
1762 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1763 Sized_relobj
<size
, big_endian
>* relobj
,
1764 unsigned int shndx
, Address address
)
1765 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
, false)); }
1768 add_output_section_generic(Output_section
* os
, unsigned int type
,
1769 Output_data
* od
, uint64_t address
,
1772 gold_assert(addend
== 0);
1773 this->add(od
, Output_reloc_type(os
, type
, od
,
1774 convert_types
<Address
, uint64_t>(address
),
1779 add_output_section_generic(Output_section
* os
, unsigned int type
,
1780 Output_data
* od
, Relobj
* relobj
,
1781 unsigned int shndx
, uint64_t address
,
1784 gold_assert(addend
== 0);
1785 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1786 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
1787 this->add(od
, Output_reloc_type(os
, type
, sized_relobj
, shndx
,
1788 convert_types
<Address
, uint64_t>(address
),
1792 // As above, but the reloc TYPE is relative
1795 add_output_section_relative(Output_section
* os
, unsigned int type
,
1796 Output_data
* od
, Address address
)
1797 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, true)); }
1800 add_output_section_relative(Output_section
* os
, unsigned int type
,
1802 Sized_relobj
<size
, big_endian
>* relobj
,
1803 unsigned int shndx
, Address address
)
1804 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
, true)); }
1806 // Add an absolute relocation.
1809 add_absolute(unsigned int type
, Output_data
* od
, Address address
)
1810 { this->add(od
, Output_reloc_type(type
, od
, address
, false)); }
1813 add_absolute(unsigned int type
, Output_data
* od
,
1814 Sized_relobj
<size
, big_endian
>* relobj
,
1815 unsigned int shndx
, Address address
)
1816 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, false)); }
1818 // Add a relative relocation
1821 add_relative(unsigned int type
, Output_data
* od
, Address address
)
1822 { this->add(od
, Output_reloc_type(type
, od
, address
, true)); }
1825 add_relative(unsigned int type
, Output_data
* od
,
1826 Sized_relobj
<size
, big_endian
>* relobj
,
1827 unsigned int shndx
, Address address
)
1828 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, true)); }
1830 // Add a target specific relocation. A target which calls this must
1831 // define the reloc_symbol_index and reloc_addend virtual functions.
1834 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1836 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
)); }
1839 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1840 Sized_relobj
<size
, big_endian
>* relobj
,
1841 unsigned int shndx
, Address address
)
1842 { this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
)); }
1845 // The SHT_RELA version of Output_data_reloc.
1847 template<bool dynamic
, int size
, bool big_endian
>
1848 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1849 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1852 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
1856 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1857 typedef typename
Output_reloc_type::Address Address
;
1858 typedef typename
Output_reloc_type::Addend Addend
;
1860 Output_data_reloc(bool sr
)
1861 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>(sr
)
1864 // Add a reloc against a global symbol.
1867 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1868 Address address
, Addend addend
)
1869 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1870 false, false, false)); }
1873 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1874 Sized_relobj
<size
, big_endian
>* relobj
,
1875 unsigned int shndx
, Address address
,
1877 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1878 addend
, false, false, false)); }
1881 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1882 uint64_t address
, uint64_t addend
)
1884 this->add(od
, Output_reloc_type(gsym
, type
, od
,
1885 convert_types
<Address
, uint64_t>(address
),
1886 convert_types
<Addend
, uint64_t>(addend
),
1887 false, false, false));
1891 add_global_generic(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1892 Relobj
* relobj
, unsigned int shndx
, uint64_t address
,
1895 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1896 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
1897 this->add(od
, Output_reloc_type(gsym
, type
, sized_relobj
, shndx
,
1898 convert_types
<Address
, uint64_t>(address
),
1899 convert_types
<Addend
, uint64_t>(addend
),
1900 false, false, false));
1903 // Add a RELATIVE reloc against a global symbol. The final output
1904 // relocation will not reference the symbol, but we must keep the symbol
1905 // information long enough to set the addend of the relocation correctly
1906 // when it is written.
1909 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1910 Address address
, Addend addend
, bool use_plt_offset
)
1911 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
, true,
1912 true, use_plt_offset
)); }
1915 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1916 Sized_relobj
<size
, big_endian
>* relobj
,
1917 unsigned int shndx
, Address address
, Addend addend
,
1918 bool use_plt_offset
)
1919 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1920 addend
, true, true, use_plt_offset
)); }
1922 // Add a global relocation which does not use a symbol for the relocation,
1923 // but which gets its addend from a symbol.
1926 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1927 Address address
, Addend addend
)
1928 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1929 false, true, false)); }
1932 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1934 Sized_relobj
<size
, big_endian
>* relobj
,
1935 unsigned int shndx
, Address address
, Addend addend
)
1936 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1937 addend
, false, true, false)); }
1939 // Add a reloc against a local symbol.
1942 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1943 unsigned int local_sym_index
, unsigned int type
,
1944 Output_data
* od
, Address address
, Addend addend
)
1946 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1947 addend
, false, false, false, false));
1951 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1952 unsigned int local_sym_index
, unsigned int type
,
1953 Output_data
* od
, unsigned int shndx
, Address address
,
1956 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1957 address
, addend
, false, false, false,
1962 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1963 unsigned int type
, Output_data
* od
, uint64_t address
,
1966 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1967 static_cast<Sized_relobj
<size
, big_endian
> *>(relobj
);
1968 this->add(od
, Output_reloc_type(sized_relobj
, local_sym_index
, type
, od
,
1969 convert_types
<Address
, uint64_t>(address
),
1970 convert_types
<Addend
, uint64_t>(addend
),
1971 false, false, false, false));
1975 add_local_generic(Relobj
* relobj
, unsigned int local_sym_index
,
1976 unsigned int type
, Output_data
* od
, unsigned int shndx
,
1977 uint64_t address
, uint64_t addend
)
1979 Sized_relobj
<size
, big_endian
>* sized_relobj
=
1980 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
1981 this->add(od
, Output_reloc_type(sized_relobj
, local_sym_index
, type
, shndx
,
1982 convert_types
<Address
, uint64_t>(address
),
1983 convert_types
<Addend
, uint64_t>(addend
),
1984 false, false, false, false));
1987 // Add a RELATIVE reloc against a local symbol.
1990 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1991 unsigned int local_sym_index
, unsigned int type
,
1992 Output_data
* od
, Address address
, Addend addend
,
1993 bool use_plt_offset
)
1995 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1996 addend
, true, true, false,
2001 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
2002 unsigned int local_sym_index
, unsigned int type
,
2003 Output_data
* od
, unsigned int shndx
, Address address
,
2004 Addend addend
, bool use_plt_offset
)
2006 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
2007 address
, addend
, true, true, false,
2011 // Add a local relocation which does not use a symbol for the relocation,
2012 // but which gets it's addend from a symbol.
2015 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
2016 unsigned int local_sym_index
, unsigned int type
,
2017 Output_data
* od
, Address address
, Addend addend
)
2019 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
2020 addend
, false, true, false, false));
2024 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
2025 unsigned int local_sym_index
, unsigned int type
,
2026 Output_data
* od
, unsigned int shndx
,
2027 Address address
, Addend addend
)
2029 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
2030 address
, addend
, false, true, false,
2034 // Add a reloc against a local section symbol. This will be
2035 // converted into a reloc against the STT_SECTION symbol of the
2039 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
2040 unsigned int input_shndx
, unsigned int type
,
2041 Output_data
* od
, Address address
, Addend addend
)
2043 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
, address
,
2044 addend
, false, false, true, false));
2048 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
2049 unsigned int input_shndx
, unsigned int type
,
2050 Output_data
* od
, unsigned int shndx
, Address address
,
2053 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
2054 address
, addend
, false, false, true,
2058 // A reloc against the STT_SECTION symbol of an output section.
2061 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
2062 Address address
, Addend addend
)
2063 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, addend
, false)); }
2066 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
2067 Sized_relobj
<size
, big_endian
>* relobj
,
2068 unsigned int shndx
, Address address
, Addend addend
)
2069 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
,
2073 add_output_section_generic(Output_section
* os
, unsigned int type
,
2074 Output_data
* od
, uint64_t address
,
2077 this->add(od
, Output_reloc_type(os
, type
, od
,
2078 convert_types
<Address
, uint64_t>(address
),
2079 convert_types
<Addend
, uint64_t>(addend
),
2084 add_output_section_generic(Output_section
* os
, unsigned int type
,
2085 Output_data
* od
, Relobj
* relobj
,
2086 unsigned int shndx
, uint64_t address
,
2089 Sized_relobj
<size
, big_endian
>* sized_relobj
=
2090 static_cast<Sized_relobj
<size
, big_endian
>*>(relobj
);
2091 this->add(od
, Output_reloc_type(os
, type
, sized_relobj
, shndx
,
2092 convert_types
<Address
, uint64_t>(address
),
2093 convert_types
<Addend
, uint64_t>(addend
),
2097 // As above, but the reloc TYPE is relative
2100 add_output_section_relative(Output_section
* os
, unsigned int type
,
2101 Output_data
* od
, Address address
, Addend addend
)
2102 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, addend
, true)); }
2105 add_output_section_relative(Output_section
* os
, unsigned int type
,
2107 Sized_relobj
<size
, big_endian
>* relobj
,
2108 unsigned int shndx
, Address address
,
2111 this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
,
2112 address
, addend
, true));
2115 // Add an absolute relocation.
2118 add_absolute(unsigned int type
, Output_data
* od
, Address address
,
2120 { this->add(od
, Output_reloc_type(type
, od
, address
, addend
, false)); }
2123 add_absolute(unsigned int type
, Output_data
* od
,
2124 Sized_relobj
<size
, big_endian
>* relobj
,
2125 unsigned int shndx
, Address address
, Addend addend
)
2126 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, addend
,
2129 // Add a relative relocation
2132 add_relative(unsigned int type
, Output_data
* od
, Address address
,
2134 { this->add(od
, Output_reloc_type(type
, od
, address
, addend
, true)); }
2137 add_relative(unsigned int type
, Output_data
* od
,
2138 Sized_relobj
<size
, big_endian
>* relobj
,
2139 unsigned int shndx
, Address address
, Addend addend
)
2140 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, addend
,
2143 // Add a target specific relocation. A target which calls this must
2144 // define the reloc_symbol_index and reloc_addend virtual functions.
2147 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
2148 Address address
, Addend addend
)
2149 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
, addend
)); }
2152 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
2153 Sized_relobj
<size
, big_endian
>* relobj
,
2154 unsigned int shndx
, Address address
, Addend addend
)
2156 this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
,
2161 // Output_relocatable_relocs represents a relocation section in a
2162 // relocatable link. The actual data is written out in the target
2163 // hook relocate_relocs. This just saves space for it.
2165 template<int sh_type
, int size
, bool big_endian
>
2166 class Output_relocatable_relocs
: public Output_section_data
2169 Output_relocatable_relocs(Relocatable_relocs
* rr
)
2170 : Output_section_data(Output_data::default_alignment_for_size(size
)),
2175 set_final_data_size();
2177 // Write out the data. There is nothing to do here.
2179 do_write(Output_file
*)
2182 // Write to a map file.
2184 do_print_to_mapfile(Mapfile
* mapfile
) const
2185 { mapfile
->print_output_data(this, _("** relocs")); }
2188 // The relocs associated with this input section.
2189 Relocatable_relocs
* rr_
;
2192 // Handle a GROUP section.
2194 template<int size
, bool big_endian
>
2195 class Output_data_group
: public Output_section_data
2198 // The constructor clears *INPUT_SHNDXES.
2199 Output_data_group(Sized_relobj_file
<size
, big_endian
>* relobj
,
2200 section_size_type entry_count
,
2201 elfcpp::Elf_Word flags
,
2202 std::vector
<unsigned int>* input_shndxes
);
2205 do_write(Output_file
*);
2207 // Write to a map file.
2209 do_print_to_mapfile(Mapfile
* mapfile
) const
2210 { mapfile
->print_output_data(this, _("** group")); }
2212 // Set final data size.
2214 set_final_data_size()
2215 { this->set_data_size((this->input_shndxes_
.size() + 1) * 4); }
2218 // The input object.
2219 Sized_relobj_file
<size
, big_endian
>* relobj_
;
2220 // The group flag word.
2221 elfcpp::Elf_Word flags_
;
2222 // The section indexes of the input sections in this group.
2223 std::vector
<unsigned int> input_shndxes_
;
2226 // Output_data_got is used to manage a GOT. Each entry in the GOT is
2227 // for one symbol--either a global symbol or a local symbol in an
2228 // object. The target specific code adds entries to the GOT as
2229 // needed. The GOT_SIZE template parameter is the size in bits of a
2230 // GOT entry, typically 32 or 64.
2232 class Output_data_got_base
: public Output_section_data_build
2235 Output_data_got_base(uint64_t align
)
2236 : Output_section_data_build(align
)
2239 Output_data_got_base(off_t data_size
, uint64_t align
)
2240 : Output_section_data_build(data_size
, align
)
2243 // Reserve the slot at index I in the GOT.
2245 reserve_slot(unsigned int i
)
2246 { this->do_reserve_slot(i
); }
2249 // Reserve the slot at index I in the GOT.
2251 do_reserve_slot(unsigned int i
) = 0;
2254 template<int got_size
, bool big_endian
>
2255 class Output_data_got
: public Output_data_got_base
2258 typedef typename
elfcpp::Elf_types
<got_size
>::Elf_Addr Valtype
;
2261 : Output_data_got_base(Output_data::default_alignment_for_size(got_size
)),
2262 entries_(), free_list_()
2265 Output_data_got(off_t data_size
)
2266 : Output_data_got_base(data_size
,
2267 Output_data::default_alignment_for_size(got_size
)),
2268 entries_(), free_list_()
2270 // For an incremental update, we have an existing GOT section.
2271 // Initialize the list of entries and the free list.
2272 this->entries_
.resize(data_size
/ (got_size
/ 8));
2273 this->free_list_
.init(data_size
, false);
2276 // Add an entry for a global symbol to the GOT. Return true if this
2277 // is a new GOT entry, false if the symbol was already in the GOT.
2279 add_global(Symbol
* gsym
, unsigned int got_type
);
2281 // Like add_global, but use the PLT offset of the global symbol if
2284 add_global_plt(Symbol
* gsym
, unsigned int got_type
);
2286 // Like add_global, but for a TLS symbol where the value will be
2287 // offset using Target::tls_offset_for_global.
2289 add_global_tls(Symbol
* gsym
, unsigned int got_type
)
2290 { return add_global_plt(gsym
, got_type
); }
2292 // Add an entry for a global symbol to the GOT, and add a dynamic
2293 // relocation of type R_TYPE for the GOT entry.
2295 add_global_with_rel(Symbol
* gsym
, unsigned int got_type
,
2296 Output_data_reloc_generic
* rel_dyn
, unsigned int r_type
);
2298 // Add a pair of entries for a global symbol to the GOT, and add
2299 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
2301 add_global_pair_with_rel(Symbol
* gsym
, unsigned int got_type
,
2302 Output_data_reloc_generic
* rel_dyn
,
2303 unsigned int r_type_1
, unsigned int r_type_2
);
2305 // Add an entry for a local symbol to the GOT. This returns true if
2306 // this is a new GOT entry, false if the symbol already has a GOT
2309 add_local(Relobj
* object
, unsigned int sym_index
, unsigned int got_type
);
2311 // Like add_local, but use the PLT offset of the local symbol if it
2314 add_local_plt(Relobj
* object
, unsigned int sym_index
, unsigned int got_type
);
2316 // Like add_local, but for a TLS symbol where the value will be
2317 // offset using Target::tls_offset_for_local.
2319 add_local_tls(Relobj
* object
, unsigned int sym_index
, unsigned int got_type
)
2320 { return add_local_plt(object
, sym_index
, got_type
); }
2322 // Add an entry for a local symbol to the GOT, and add a dynamic
2323 // relocation of type R_TYPE for the GOT entry.
2325 add_local_with_rel(Relobj
* object
, unsigned int sym_index
,
2326 unsigned int got_type
, Output_data_reloc_generic
* rel_dyn
,
2327 unsigned int r_type
);
2329 // Add a pair of entries for a local symbol to the GOT, and add
2330 // a dynamic relocation of type R_TYPE using the section symbol of
2331 // the output section to which input section SHNDX maps, on the first.
2332 // The first got entry will have a value of zero, the second the
2333 // value of the local symbol.
2335 add_local_pair_with_rel(Relobj
* object
, unsigned int sym_index
,
2336 unsigned int shndx
, unsigned int got_type
,
2337 Output_data_reloc_generic
* rel_dyn
,
2338 unsigned int r_type
);
2340 // Add a pair of entries for a local symbol to the GOT, and add
2341 // a dynamic relocation of type R_TYPE using STN_UNDEF on the first.
2342 // The first got entry will have a value of zero, the second the
2343 // value of the local symbol offset by Target::tls_offset_for_local.
2345 add_local_tls_pair(Relobj
* object
, unsigned int sym_index
,
2346 unsigned int got_type
,
2347 Output_data_reloc_generic
* rel_dyn
,
2348 unsigned int r_type
);
2350 // Add a constant to the GOT. This returns the offset of the new
2351 // entry from the start of the GOT.
2353 add_constant(Valtype constant
)
2355 unsigned int got_offset
= this->add_got_entry(Got_entry(constant
));
2359 // Replace GOT entry I with a new constant.
2361 replace_constant(unsigned int i
, Valtype constant
)
2363 this->replace_got_entry(i
, Got_entry(constant
));
2366 // Reserve a slot in the GOT for a local symbol.
2368 reserve_local(unsigned int i
, Relobj
* object
, unsigned int sym_index
,
2369 unsigned int got_type
);
2371 // Reserve a slot in the GOT for a global symbol.
2373 reserve_global(unsigned int i
, Symbol
* gsym
, unsigned int got_type
);
2376 // Write out the GOT table.
2378 do_write(Output_file
*);
2380 // Write to a map file.
2382 do_print_to_mapfile(Mapfile
* mapfile
) const
2383 { mapfile
->print_output_data(this, _("** GOT")); }
2385 // Reserve the slot at index I in the GOT.
2387 do_reserve_slot(unsigned int i
)
2388 { this->free_list_
.remove(i
* got_size
/ 8, (i
+ 1) * got_size
/ 8); }
2390 // Return the number of words in the GOT.
2392 num_entries () const
2393 { return this->entries_
.size(); }
2395 // Return the offset into the GOT of GOT entry I.
2397 got_offset(unsigned int i
) const
2398 { return i
* (got_size
/ 8); }
2401 // This POD class holds a single GOT entry.
2405 // Create a zero entry.
2407 : local_sym_index_(RESERVED_CODE
), use_plt_or_tls_offset_(false)
2408 { this->u_
.constant
= 0; }
2410 // Create a global symbol entry.
2411 Got_entry(Symbol
* gsym
, bool use_plt_or_tls_offset
)
2412 : local_sym_index_(GSYM_CODE
),
2413 use_plt_or_tls_offset_(use_plt_or_tls_offset
)
2414 { this->u_
.gsym
= gsym
; }
2416 // Create a local symbol entry.
2417 Got_entry(Relobj
* object
, unsigned int local_sym_index
,
2418 bool use_plt_or_tls_offset
)
2419 : local_sym_index_(local_sym_index
),
2420 use_plt_or_tls_offset_(use_plt_or_tls_offset
)
2422 gold_assert(local_sym_index
!= GSYM_CODE
2423 && local_sym_index
!= CONSTANT_CODE
2424 && local_sym_index
!= RESERVED_CODE
2425 && local_sym_index
== this->local_sym_index_
);
2426 this->u_
.object
= object
;
2429 // Create a constant entry. The constant is a host value--it will
2430 // be swapped, if necessary, when it is written out.
2431 explicit Got_entry(Valtype constant
)
2432 : local_sym_index_(CONSTANT_CODE
), use_plt_or_tls_offset_(false)
2433 { this->u_
.constant
= constant
; }
2435 // Write the GOT entry to an output view.
2437 write(unsigned int got_indx
, unsigned char* pov
) const;
2442 GSYM_CODE
= 0x7fffffff,
2443 CONSTANT_CODE
= 0x7ffffffe,
2444 RESERVED_CODE
= 0x7ffffffd
2449 // For a local symbol, the object.
2451 // For a global symbol, the symbol.
2453 // For a constant, the constant.
2456 // For a local symbol, the local symbol index. This is GSYM_CODE
2457 // for a global symbol, or CONSTANT_CODE for a constant.
2458 unsigned int local_sym_index_
: 31;
2459 // Whether to use the PLT offset of the symbol if it has one.
2460 // For TLS symbols, whether to offset the symbol value.
2461 bool use_plt_or_tls_offset_
: 1;
2464 typedef std::vector
<Got_entry
> Got_entries
;
2466 // Create a new GOT entry and return its offset.
2468 add_got_entry(Got_entry got_entry
);
2470 // Create a pair of new GOT entries and return the offset of the first.
2472 add_got_entry_pair(Got_entry got_entry_1
, Got_entry got_entry_2
);
2474 // Replace GOT entry I with a new value.
2476 replace_got_entry(unsigned int i
, Got_entry got_entry
);
2478 // Return the offset into the GOT of the last entry added.
2480 last_got_offset() const
2481 { return this->got_offset(this->num_entries() - 1); }
2483 // Set the size of the section.
2486 { this->set_current_data_size(this->got_offset(this->num_entries())); }
2488 // The list of GOT entries.
2489 Got_entries entries_
;
2491 // List of available regions within the section, for incremental
2493 Free_list free_list_
;
2496 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
2499 class Output_data_dynamic
: public Output_section_data
2502 Output_data_dynamic(Stringpool
* pool
)
2503 : Output_section_data(Output_data::default_alignment()),
2504 entries_(), pool_(pool
)
2507 // Add a new dynamic entry with a fixed numeric value.
2509 add_constant(elfcpp::DT tag
, unsigned int val
)
2510 { this->add_entry(Dynamic_entry(tag
, val
)); }
2512 // Add a new dynamic entry with the address of output data.
2514 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
2515 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
2517 // Add a new dynamic entry with the address of output data
2518 // plus a constant offset.
2520 add_section_plus_offset(elfcpp::DT tag
, const Output_data
* od
,
2521 unsigned int offset
)
2522 { this->add_entry(Dynamic_entry(tag
, od
, offset
)); }
2524 // Add a new dynamic entry with the size of output data.
2526 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
2527 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
2529 // Add a new dynamic entry with the total size of two output datas.
2531 add_section_size(elfcpp::DT tag
, const Output_data
* od
,
2532 const Output_data
* od2
)
2533 { this->add_entry(Dynamic_entry(tag
, od
, od2
)); }
2535 // Add a new dynamic entry with the address of a symbol.
2537 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
2538 { this->add_entry(Dynamic_entry(tag
, sym
)); }
2540 // Add a new dynamic entry with a string.
2542 add_string(elfcpp::DT tag
, const char* str
)
2543 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
2546 add_string(elfcpp::DT tag
, const std::string
& str
)
2547 { this->add_string(tag
, str
.c_str()); }
2550 // Adjust the output section to set the entry size.
2552 do_adjust_output_section(Output_section
*);
2554 // Set the final data size.
2556 set_final_data_size();
2558 // Write out the dynamic entries.
2560 do_write(Output_file
*);
2562 // Write to a map file.
2564 do_print_to_mapfile(Mapfile
* mapfile
) const
2565 { mapfile
->print_output_data(this, _("** dynamic")); }
2568 // This POD class holds a single dynamic entry.
2572 // Create an entry with a fixed numeric value.
2573 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
2574 : tag_(tag
), offset_(DYNAMIC_NUMBER
)
2575 { this->u_
.val
= val
; }
2577 // Create an entry with the size or address of a section.
2578 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
2580 offset_(section_size
2581 ? DYNAMIC_SECTION_SIZE
2582 : DYNAMIC_SECTION_ADDRESS
)
2588 // Create an entry with the size of two sections.
2589 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, const Output_data
* od2
)
2591 offset_(DYNAMIC_SECTION_SIZE
)
2597 // Create an entry with the address of a section plus a constant offset.
2598 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, unsigned int offset
)
2601 { this->u_
.od
= od
; }
2603 // Create an entry with the address of a symbol.
2604 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
2605 : tag_(tag
), offset_(DYNAMIC_SYMBOL
)
2606 { this->u_
.sym
= sym
; }
2608 // Create an entry with a string.
2609 Dynamic_entry(elfcpp::DT tag
, const char* str
)
2610 : tag_(tag
), offset_(DYNAMIC_STRING
)
2611 { this->u_
.str
= str
; }
2613 // Return the tag of this entry.
2616 { return this->tag_
; }
2618 // Write the dynamic entry to an output view.
2619 template<int size
, bool big_endian
>
2621 write(unsigned char* pov
, const Stringpool
*) const;
2624 // Classification is encoded in the OFFSET field.
2628 DYNAMIC_SECTION_ADDRESS
= 0,
2630 DYNAMIC_NUMBER
= -1U,
2632 DYNAMIC_SECTION_SIZE
= -2U,
2634 DYNAMIC_SYMBOL
= -3U,
2636 DYNAMIC_STRING
= -4U
2637 // Any other value indicates a section address plus OFFSET.
2642 // For DYNAMIC_NUMBER.
2644 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
2645 const Output_data
* od
;
2646 // For DYNAMIC_SYMBOL.
2648 // For DYNAMIC_STRING.
2651 // For DYNAMIC_SYMBOL with two sections.
2652 const Output_data
* od2
;
2655 // The type of entry (Classification) or offset within a section.
2656 unsigned int offset_
;
2659 // Add an entry to the list.
2661 add_entry(const Dynamic_entry
& entry
)
2662 { this->entries_
.push_back(entry
); }
2664 // Sized version of write function.
2665 template<int size
, bool big_endian
>
2667 sized_write(Output_file
* of
);
2669 // The type of the list of entries.
2670 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
2673 Dynamic_entries entries_
;
2674 // The pool used for strings.
2678 // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
2679 // which may be required if the object file has more than
2680 // SHN_LORESERVE sections.
2682 class Output_symtab_xindex
: public Output_section_data
2685 Output_symtab_xindex(size_t symcount
)
2686 : Output_section_data(symcount
* 4, 4, true),
2690 // Add an entry: symbol number SYMNDX has section SHNDX.
2692 add(unsigned int symndx
, unsigned int shndx
)
2693 { this->entries_
.push_back(std::make_pair(symndx
, shndx
)); }
2697 do_write(Output_file
*);
2699 // Write to a map file.
2701 do_print_to_mapfile(Mapfile
* mapfile
) const
2702 { mapfile
->print_output_data(this, _("** symtab xindex")); }
2705 template<bool big_endian
>
2707 endian_do_write(unsigned char*);
2709 // It is likely that most symbols will not require entries. Rather
2710 // than keep a vector for all symbols, we keep pairs of symbol index
2711 // and section index.
2712 typedef std::vector
<std::pair
<unsigned int, unsigned int> > Xindex_entries
;
2714 // The entries we need.
2715 Xindex_entries entries_
;
2718 // A relaxed input section.
2719 class Output_relaxed_input_section
: public Output_section_data_build
2722 // We would like to call relobj->section_addralign(shndx) to get the
2723 // alignment but we do not want the constructor to fail. So callers
2724 // are repsonsible for ensuring that.
2725 Output_relaxed_input_section(Relobj
* relobj
, unsigned int shndx
,
2727 : Output_section_data_build(addralign
), relobj_(relobj
), shndx_(shndx
)
2730 // Return the Relobj of this relaxed input section.
2733 { return this->relobj_
; }
2735 // Return the section index of this relaxed input section.
2738 { return this->shndx_
; }
2742 set_relobj(Relobj
* relobj
)
2743 { this->relobj_
= relobj
; }
2746 set_shndx(unsigned int shndx
)
2747 { this->shndx_
= shndx
; }
2751 unsigned int shndx_
;
2754 // This class describes properties of merge data sections. It is used
2755 // as a key type for maps.
2756 class Merge_section_properties
2759 Merge_section_properties(bool is_string
, uint64_t entsize
,
2761 : is_string_(is_string
), entsize_(entsize
), addralign_(addralign
)
2764 // Whether this equals to another Merge_section_properties MSP.
2766 eq(const Merge_section_properties
& msp
) const
2768 return ((this->is_string_
== msp
.is_string_
)
2769 && (this->entsize_
== msp
.entsize_
)
2770 && (this->addralign_
== msp
.addralign_
));
2773 // Compute a hash value for this using 64-bit FNV-1a hash.
2777 uint64_t h
= 14695981039346656037ULL; // FNV offset basis.
2778 uint64_t prime
= 1099511628211ULL;
2779 h
= (h
^ static_cast<uint64_t>(this->is_string_
)) * prime
;
2780 h
= (h
^ static_cast<uint64_t>(this->entsize_
)) * prime
;
2781 h
= (h
^ static_cast<uint64_t>(this->addralign_
)) * prime
;
2785 // Functors for associative containers.
2789 operator()(const Merge_section_properties
& msp1
,
2790 const Merge_section_properties
& msp2
) const
2791 { return msp1
.eq(msp2
); }
2797 operator()(const Merge_section_properties
& msp
) const
2798 { return msp
.hash_value(); }
2802 // Whether this merge data section is for strings.
2804 // Entsize of this merge data section.
2806 // Address alignment.
2807 uint64_t addralign_
;
2810 // This class is used to speed up look up of special input sections in an
2813 class Output_section_lookup_maps
2816 Output_section_lookup_maps()
2817 : is_valid_(true), merge_sections_by_properties_(),
2818 merge_sections_by_id_(), relaxed_input_sections_by_id_()
2821 // Whether the maps are valid.
2824 { return this->is_valid_
; }
2826 // Invalidate the maps.
2829 { this->is_valid_
= false; }
2835 this->merge_sections_by_properties_
.clear();
2836 this->merge_sections_by_id_
.clear();
2837 this->relaxed_input_sections_by_id_
.clear();
2838 // A cleared map is valid.
2839 this->is_valid_
= true;
2842 // Find a merge section by merge section properties. Return NULL if none
2845 find_merge_section(const Merge_section_properties
& msp
) const
2847 gold_assert(this->is_valid_
);
2848 Merge_sections_by_properties::const_iterator p
=
2849 this->merge_sections_by_properties_
.find(msp
);
2850 return p
!= this->merge_sections_by_properties_
.end() ? p
->second
: NULL
;
2853 // Find a merge section by section ID of a merge input section. Return NULL
2854 // if none is found.
2856 find_merge_section(const Object
* object
, unsigned int shndx
) const
2858 gold_assert(this->is_valid_
);
2859 Merge_sections_by_id::const_iterator p
=
2860 this->merge_sections_by_id_
.find(Const_section_id(object
, shndx
));
2861 return p
!= this->merge_sections_by_id_
.end() ? p
->second
: NULL
;
2864 // Add a merge section pointed by POMB with properties MSP.
2866 add_merge_section(const Merge_section_properties
& msp
,
2867 Output_merge_base
* pomb
)
2869 std::pair
<Merge_section_properties
, Output_merge_base
*> value(msp
, pomb
);
2870 std::pair
<Merge_sections_by_properties::iterator
, bool> result
=
2871 this->merge_sections_by_properties_
.insert(value
);
2872 gold_assert(result
.second
);
2875 // Add a mapping from a merged input section in OBJECT with index SHNDX
2876 // to a merge output section pointed by POMB.
2878 add_merge_input_section(const Object
* object
, unsigned int shndx
,
2879 Output_merge_base
* pomb
)
2881 Const_section_id
csid(object
, shndx
);
2882 std::pair
<Const_section_id
, Output_merge_base
*> value(csid
, pomb
);
2883 std::pair
<Merge_sections_by_id::iterator
, bool> result
=
2884 this->merge_sections_by_id_
.insert(value
);
2885 gold_assert(result
.second
);
2888 // Find a relaxed input section of OBJECT with index SHNDX.
2889 Output_relaxed_input_section
*
2890 find_relaxed_input_section(const Object
* object
, unsigned int shndx
) const
2892 gold_assert(this->is_valid_
);
2893 Relaxed_input_sections_by_id::const_iterator p
=
2894 this->relaxed_input_sections_by_id_
.find(Const_section_id(object
, shndx
));
2895 return p
!= this->relaxed_input_sections_by_id_
.end() ? p
->second
: NULL
;
2898 // Add a relaxed input section pointed by POMB and whose original input
2899 // section is in OBJECT with index SHNDX.
2901 add_relaxed_input_section(const Relobj
* relobj
, unsigned int shndx
,
2902 Output_relaxed_input_section
* poris
)
2904 Const_section_id
csid(relobj
, shndx
);
2905 std::pair
<Const_section_id
, Output_relaxed_input_section
*>
2907 std::pair
<Relaxed_input_sections_by_id::iterator
, bool> result
=
2908 this->relaxed_input_sections_by_id_
.insert(value
);
2909 gold_assert(result
.second
);
2913 typedef Unordered_map
<Const_section_id
, Output_merge_base
*,
2914 Const_section_id_hash
>
2915 Merge_sections_by_id
;
2917 typedef Unordered_map
<Merge_section_properties
, Output_merge_base
*,
2918 Merge_section_properties::hash
,
2919 Merge_section_properties::equal_to
>
2920 Merge_sections_by_properties
;
2922 typedef Unordered_map
<Const_section_id
, Output_relaxed_input_section
*,
2923 Const_section_id_hash
>
2924 Relaxed_input_sections_by_id
;
2926 // Whether this is valid
2928 // Merge sections by merge section properties.
2929 Merge_sections_by_properties merge_sections_by_properties_
;
2930 // Merge sections by section IDs.
2931 Merge_sections_by_id merge_sections_by_id_
;
2932 // Relaxed sections by section IDs.
2933 Relaxed_input_sections_by_id relaxed_input_sections_by_id_
;
2936 // This abstract base class defines the interface for the
2937 // types of methods used to fill free space left in an output
2938 // section during an incremental link. These methods are used
2939 // to insert dummy compilation units into debug info so that
2940 // debug info consumers can scan the debug info serially.
2946 : is_big_endian_(parameters
->target().is_big_endian())
2953 // Return the smallest size chunk of free space that can be
2954 // filled with a dummy compilation unit.
2956 minimum_hole_size() const
2957 { return this->do_minimum_hole_size(); }
2959 // Write a fill pattern of length LEN at offset OFF in the file.
2961 write(Output_file
* of
, off_t off
, size_t len
) const
2962 { this->do_write(of
, off
, len
); }
2966 do_minimum_hole_size() const = 0;
2969 do_write(Output_file
* of
, off_t off
, size_t len
) const = 0;
2972 is_big_endian() const
2973 { return this->is_big_endian_
; }
2976 bool is_big_endian_
;
2979 // Fill method that introduces a dummy compilation unit in
2980 // a .debug_info or .debug_types section.
2982 class Output_fill_debug_info
: public Output_fill
2985 Output_fill_debug_info(bool is_debug_types
)
2986 : is_debug_types_(is_debug_types
)
2991 do_minimum_hole_size() const;
2994 do_write(Output_file
* of
, off_t off
, size_t len
) const;
2997 // Version of the header.
2998 static const int version
= 4;
2999 // True if this is a .debug_types section.
3000 bool is_debug_types_
;
3003 // Fill method that introduces a dummy compilation unit in
3004 // a .debug_line section.
3006 class Output_fill_debug_line
: public Output_fill
3009 Output_fill_debug_line()
3014 do_minimum_hole_size() const;
3017 do_write(Output_file
* of
, off_t off
, size_t len
) const;
3020 // Version of the header. We write a DWARF-3 header because it's smaller
3021 // and many tools have not yet been updated to understand the DWARF-4 header.
3022 static const int version
= 3;
3023 // Length of the portion of the header that follows the header_length
3024 // field. This includes the following fields:
3025 // minimum_instruction_length, default_is_stmt, line_base, line_range,
3026 // opcode_base, standard_opcode_lengths[], include_directories, filenames.
3027 // The standard_opcode_lengths array is 12 bytes long, and the
3028 // include_directories and filenames fields each contain only a single
3030 static const size_t header_length
= 19;
3033 // An output section. We don't expect to have too many output
3034 // sections, so we don't bother to do a template on the size.
3036 class Output_section
: public Output_data
3039 // Create an output section, giving the name, type, and flags.
3040 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
3041 virtual ~Output_section();
3043 // Add a new input section SHNDX, named NAME, with header SHDR, from
3044 // object OBJECT. RELOC_SHNDX is the index of a relocation section
3045 // which applies to this section, or 0 if none, or -1 if more than
3046 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
3047 // in a linker script; in that case we need to keep track of input
3048 // sections associated with an output section. Return the offset
3049 // within the output section.
3050 template<int size
, bool big_endian
>
3052 add_input_section(Layout
* layout
, Sized_relobj_file
<size
, big_endian
>* object
,
3053 unsigned int shndx
, const char* name
,
3054 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
3055 unsigned int reloc_shndx
, bool have_sections_script
);
3057 // Add generated data POSD to this output section.
3059 add_output_section_data(Output_section_data
* posd
);
3061 // Add a relaxed input section PORIS called NAME to this output section
3064 add_relaxed_input_section(Layout
* layout
,
3065 Output_relaxed_input_section
* poris
,
3066 const std::string
& name
);
3068 // Return the section name.
3071 { return this->name_
; }
3073 // Return the section type.
3076 { return this->type_
; }
3078 // Return the section flags.
3081 { return this->flags_
; }
3083 typedef std::map
<Section_id
, unsigned int> Section_layout_order
;
3086 update_section_layout(const Section_layout_order
* order_map
);
3088 // Update the output section flags based on input section flags.
3090 update_flags_for_input_section(elfcpp::Elf_Xword flags
);
3092 // Return the entsize field.
3095 { return this->entsize_
; }
3097 // Set the entsize field.
3099 set_entsize(uint64_t v
);
3101 // Set the load address.
3103 set_load_address(uint64_t load_address
)
3105 this->load_address_
= load_address
;
3106 this->has_load_address_
= true;
3109 // Set the link field to the output section index of a section.
3111 set_link_section(const Output_data
* od
)
3113 gold_assert(this->link_
== 0
3114 && !this->should_link_to_symtab_
3115 && !this->should_link_to_dynsym_
);
3116 this->link_section_
= od
;
3119 // Set the link field to a constant.
3121 set_link(unsigned int v
)
3123 gold_assert(this->link_section_
== NULL
3124 && !this->should_link_to_symtab_
3125 && !this->should_link_to_dynsym_
);
3129 // Record that this section should link to the normal symbol table.
3131 set_should_link_to_symtab()
3133 gold_assert(this->link_section_
== NULL
3135 && !this->should_link_to_dynsym_
);
3136 this->should_link_to_symtab_
= true;
3139 // Record that this section should link to the dynamic symbol table.
3141 set_should_link_to_dynsym()
3143 gold_assert(this->link_section_
== NULL
3145 && !this->should_link_to_symtab_
);
3146 this->should_link_to_dynsym_
= true;
3149 // Return the info field.
3153 gold_assert(this->info_section_
== NULL
3154 && this->info_symndx_
== NULL
);
3158 // Set the info field to the output section index of a section.
3160 set_info_section(const Output_section
* os
)
3162 gold_assert((this->info_section_
== NULL
3163 || (this->info_section_
== os
3164 && this->info_uses_section_index_
))
3165 && this->info_symndx_
== NULL
3166 && this->info_
== 0);
3167 this->info_section_
= os
;
3168 this->info_uses_section_index_
= true;
3171 // Set the info field to the symbol table index of a symbol.
3173 set_info_symndx(const Symbol
* sym
)
3175 gold_assert(this->info_section_
== NULL
3176 && (this->info_symndx_
== NULL
3177 || this->info_symndx_
== sym
)
3178 && this->info_
== 0);
3179 this->info_symndx_
= sym
;
3182 // Set the info field to the symbol table index of a section symbol.
3184 set_info_section_symndx(const Output_section
* os
)
3186 gold_assert((this->info_section_
== NULL
3187 || (this->info_section_
== os
3188 && !this->info_uses_section_index_
))
3189 && this->info_symndx_
== NULL
3190 && this->info_
== 0);
3191 this->info_section_
= os
;
3192 this->info_uses_section_index_
= false;
3195 // Set the info field to a constant.
3197 set_info(unsigned int v
)
3199 gold_assert(this->info_section_
== NULL
3200 && this->info_symndx_
== NULL
3201 && (this->info_
== 0
3202 || this->info_
== v
));
3206 // Set the addralign field.
3208 set_addralign(uint64_t v
)
3209 { this->addralign_
= v
; }
3212 checkpoint_set_addralign(uint64_t val
)
3214 if (this->checkpoint_
!= NULL
)
3215 this->checkpoint_
->set_addralign(val
);
3218 // Whether the output section index has been set.
3220 has_out_shndx() const
3221 { return this->out_shndx_
!= -1U; }
3223 // Indicate that we need a symtab index.
3225 set_needs_symtab_index()
3226 { this->needs_symtab_index_
= true; }
3228 // Return whether we need a symtab index.
3230 needs_symtab_index() const
3231 { return this->needs_symtab_index_
; }
3233 // Get the symtab index.
3235 symtab_index() const
3237 gold_assert(this->symtab_index_
!= 0);
3238 return this->symtab_index_
;
3241 // Set the symtab index.
3243 set_symtab_index(unsigned int index
)
3245 gold_assert(index
!= 0);
3246 this->symtab_index_
= index
;
3249 // Indicate that we need a dynsym index.
3251 set_needs_dynsym_index()
3252 { this->needs_dynsym_index_
= true; }
3254 // Return whether we need a dynsym index.
3256 needs_dynsym_index() const
3257 { return this->needs_dynsym_index_
; }
3259 // Get the dynsym index.
3261 dynsym_index() const
3263 gold_assert(this->dynsym_index_
!= 0);
3264 return this->dynsym_index_
;
3267 // Set the dynsym index.
3269 set_dynsym_index(unsigned int index
)
3271 gold_assert(index
!= 0);
3272 this->dynsym_index_
= index
;
3275 // Return whether the input sections sections attachd to this output
3276 // section may require sorting. This is used to handle constructor
3277 // priorities compatibly with GNU ld.
3279 may_sort_attached_input_sections() const
3280 { return this->may_sort_attached_input_sections_
; }
3282 // Record that the input sections attached to this output section
3283 // may require sorting.
3285 set_may_sort_attached_input_sections()
3286 { this->may_sort_attached_input_sections_
= true; }
3288 // Returns true if input sections must be sorted according to the
3289 // order in which their name appear in the --section-ordering-file.
3291 input_section_order_specified()
3292 { return this->input_section_order_specified_
; }
3294 // Record that input sections must be sorted as some of their names
3295 // match the patterns specified through --section-ordering-file.
3297 set_input_section_order_specified()
3298 { this->input_section_order_specified_
= true; }
3300 // Return whether the input sections attached to this output section
3301 // require sorting. This is used to handle constructor priorities
3302 // compatibly with GNU ld.
3304 must_sort_attached_input_sections() const
3305 { return this->must_sort_attached_input_sections_
; }
3307 // Record that the input sections attached to this output section
3310 set_must_sort_attached_input_sections()
3311 { this->must_sort_attached_input_sections_
= true; }
3313 // Get the order in which this section appears in the PT_LOAD output
3315 Output_section_order
3317 { return this->order_
; }
3319 // Set the order for this section.
3321 set_order(Output_section_order order
)
3322 { this->order_
= order
; }
3324 // Return whether this section holds relro data--data which has
3325 // dynamic relocations but which may be marked read-only after the
3326 // dynamic relocations have been completed.
3329 { return this->is_relro_
; }
3331 // Record that this section holds relro data.
3334 { this->is_relro_
= true; }
3336 // Record that this section does not hold relro data.
3339 { this->is_relro_
= false; }
3341 // True if this is a small section: a section which holds small
3344 is_small_section() const
3345 { return this->is_small_section_
; }
3347 // Record that this is a small section.
3349 set_is_small_section()
3350 { this->is_small_section_
= true; }
3352 // True if this is a large section: a section which holds large
3355 is_large_section() const
3356 { return this->is_large_section_
; }
3358 // Record that this is a large section.
3360 set_is_large_section()
3361 { this->is_large_section_
= true; }
3363 // True if this is a large data (not BSS) section.
3365 is_large_data_section()
3366 { return this->is_large_section_
&& this->type_
!= elfcpp::SHT_NOBITS
; }
3368 // Return whether this section should be written after all the input
3369 // sections are complete.
3371 after_input_sections() const
3372 { return this->after_input_sections_
; }
3374 // Record that this section should be written after all the input
3375 // sections are complete.
3377 set_after_input_sections()
3378 { this->after_input_sections_
= true; }
3380 // Return whether this section requires postprocessing after all
3381 // relocations have been applied.
3383 requires_postprocessing() const
3384 { return this->requires_postprocessing_
; }
3387 is_unique_segment() const
3388 { return this->is_unique_segment_
; }
3391 set_is_unique_segment()
3392 { this->is_unique_segment_
= true; }
3394 uint64_t extra_segment_flags() const
3395 { return this->extra_segment_flags_
; }
3398 set_extra_segment_flags(uint64_t flags
)
3399 { this->extra_segment_flags_
= flags
; }
3401 uint64_t segment_alignment() const
3402 { return this->segment_alignment_
; }
3405 set_segment_alignment(uint64_t align
)
3406 { this->segment_alignment_
= align
; }
3408 // If a section requires postprocessing, return the buffer to use.
3410 postprocessing_buffer() const
3412 gold_assert(this->postprocessing_buffer_
!= NULL
);
3413 return this->postprocessing_buffer_
;
3416 // If a section requires postprocessing, create the buffer to use.
3418 create_postprocessing_buffer();
3420 // If a section requires postprocessing, this is the size of the
3421 // buffer to which relocations should be applied.
3423 postprocessing_buffer_size() const
3424 { return this->current_data_size_for_child(); }
3426 // Modify the section name. This is only permitted for an
3427 // unallocated section, and only before the size has been finalized.
3428 // Otherwise the name will not get into Layout::namepool_.
3430 set_name(const char* newname
)
3432 gold_assert((this->flags_
& elfcpp::SHF_ALLOC
) == 0);
3433 gold_assert(!this->is_data_size_valid());
3434 this->name_
= newname
;
3437 // Return whether the offset OFFSET in the input section SHNDX in
3438 // object OBJECT is being included in the link.
3440 is_input_address_mapped(const Relobj
* object
, unsigned int shndx
,
3441 off_t offset
) const;
3443 // Return the offset within the output section of OFFSET relative to
3444 // the start of input section SHNDX in object OBJECT.
3446 output_offset(const Relobj
* object
, unsigned int shndx
,
3447 section_offset_type offset
) const;
3449 // Return the output virtual address of OFFSET relative to the start
3450 // of input section SHNDX in object OBJECT.
3452 output_address(const Relobj
* object
, unsigned int shndx
,
3453 off_t offset
) const;
3455 // Look for the merged section for input section SHNDX in object
3456 // OBJECT. If found, return true, and set *ADDR to the address of
3457 // the start of the merged section. This is not necessary the
3458 // output offset corresponding to input offset 0 in the section,
3459 // since the section may be mapped arbitrarily.
3461 find_starting_output_address(const Relobj
* object
, unsigned int shndx
,
3462 uint64_t* addr
) const;
3464 // Record that this output section was found in the SECTIONS clause
3465 // of a linker script.
3467 set_found_in_sections_clause()
3468 { this->found_in_sections_clause_
= true; }
3470 // Return whether this output section was found in the SECTIONS
3471 // clause of a linker script.
3473 found_in_sections_clause() const
3474 { return this->found_in_sections_clause_
; }
3476 // Write the section header into *OPHDR.
3477 template<int size
, bool big_endian
>
3479 write_header(const Layout
*, const Stringpool
*,
3480 elfcpp::Shdr_write
<size
, big_endian
>*) const;
3482 // The next few calls are for linker script support.
3484 // In some cases we need to keep a list of the input sections
3485 // associated with this output section. We only need the list if we
3486 // might have to change the offsets of the input section within the
3487 // output section after we add the input section. The ordinary
3488 // input sections will be written out when we process the object
3489 // file, and as such we don't need to track them here. We do need
3490 // to track Output_section_data objects here. We store instances of
3491 // this structure in a std::vector, so it must be a POD. There can
3492 // be many instances of this structure, so we use a union to save
3498 : shndx_(0), p2align_(0)
3500 this->u1_
.data_size
= 0;
3501 this->u2_
.object
= NULL
;
3504 // For an ordinary input section.
3505 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
3508 p2align_(ffsll(static_cast<long long>(addralign
))),
3509 section_order_index_(0)
3511 gold_assert(shndx
!= OUTPUT_SECTION_CODE
3512 && shndx
!= MERGE_DATA_SECTION_CODE
3513 && shndx
!= MERGE_STRING_SECTION_CODE
3514 && shndx
!= RELAXED_INPUT_SECTION_CODE
);
3515 this->u1_
.data_size
= data_size
;
3516 this->u2_
.object
= object
;
3519 // For a non-merge output section.
3520 Input_section(Output_section_data
* posd
)
3521 : shndx_(OUTPUT_SECTION_CODE
), p2align_(0),
3522 section_order_index_(0)
3524 this->u1_
.data_size
= 0;
3525 this->u2_
.posd
= posd
;
3528 // For a merge section.
3529 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
3531 ? MERGE_STRING_SECTION_CODE
3532 : MERGE_DATA_SECTION_CODE
),
3534 section_order_index_(0)
3536 this->u1_
.entsize
= entsize
;
3537 this->u2_
.posd
= posd
;
3540 // For a relaxed input section.
3541 Input_section(Output_relaxed_input_section
* psection
)
3542 : shndx_(RELAXED_INPUT_SECTION_CODE
), p2align_(0),
3543 section_order_index_(0)
3545 this->u1_
.data_size
= 0;
3546 this->u2_
.poris
= psection
;
3550 section_order_index() const
3552 return this->section_order_index_
;
3556 set_section_order_index(unsigned int number
)
3558 this->section_order_index_
= number
;
3561 // The required alignment.
3565 if (this->p2align_
!= 0)
3566 return static_cast<uint64_t>(1) << (this->p2align_
- 1);
3567 else if (!this->is_input_section())
3568 return this->u2_
.posd
->addralign();
3573 // Set the required alignment, which must be either 0 or a power of 2.
3574 // For input sections that are sub-classes of Output_section_data, a
3575 // alignment of zero means asking the underlying object for alignment.
3577 set_addralign(uint64_t addralign
)
3583 gold_assert((addralign
& (addralign
- 1)) == 0);
3584 this->p2align_
= ffsll(static_cast<long long>(addralign
));
3588 // Return the current required size, without finalization.
3590 current_data_size() const;
3592 // Return the required size.
3596 // Whether this is an input section.
3598 is_input_section() const
3600 return (this->shndx_
!= OUTPUT_SECTION_CODE
3601 && this->shndx_
!= MERGE_DATA_SECTION_CODE
3602 && this->shndx_
!= MERGE_STRING_SECTION_CODE
3603 && this->shndx_
!= RELAXED_INPUT_SECTION_CODE
);
3606 // Return whether this is a merge section which matches the
3609 is_merge_section(bool is_string
, uint64_t entsize
,
3610 uint64_t addralign
) const
3612 return (this->shndx_
== (is_string
3613 ? MERGE_STRING_SECTION_CODE
3614 : MERGE_DATA_SECTION_CODE
)
3615 && this->u1_
.entsize
== entsize
3616 && this->addralign() == addralign
);
3619 // Return whether this is a merge section for some input section.
3621 is_merge_section() const
3623 return (this->shndx_
== MERGE_DATA_SECTION_CODE
3624 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3627 // Return whether this is a relaxed input section.
3629 is_relaxed_input_section() const
3630 { return this->shndx_
== RELAXED_INPUT_SECTION_CODE
; }
3632 // Return whether this is a generic Output_section_data.
3634 is_output_section_data() const
3636 return this->shndx_
== OUTPUT_SECTION_CODE
;
3639 // Return the object for an input section.
3643 // Return the input section index for an input section.
3647 // For non-input-sections, return the associated Output_section_data
3649 Output_section_data
*
3650 output_section_data() const
3652 gold_assert(!this->is_input_section());
3653 return this->u2_
.posd
;
3656 // For a merge section, return the Output_merge_base pointer.
3658 output_merge_base() const
3660 gold_assert(this->is_merge_section());
3661 return this->u2_
.pomb
;
3664 // Return the Output_relaxed_input_section object.
3665 Output_relaxed_input_section
*
3666 relaxed_input_section() const
3668 gold_assert(this->is_relaxed_input_section());
3669 return this->u2_
.poris
;
3672 // Set the output section.
3674 set_output_section(Output_section
* os
)
3676 gold_assert(!this->is_input_section());
3677 Output_section_data
* posd
=
3678 this->is_relaxed_input_section() ? this->u2_
.poris
: this->u2_
.posd
;
3679 posd
->set_output_section(os
);
3682 // Set the address and file offset. This is called during
3683 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
3684 // the enclosing section.
3686 set_address_and_file_offset(uint64_t address
, off_t file_offset
,
3687 off_t section_file_offset
);
3689 // Reset the address and file offset.
3691 reset_address_and_file_offset();
3693 // Finalize the data size.
3695 finalize_data_size();
3697 // Add an input section, for SHF_MERGE sections.
3699 add_input_section(Relobj
* object
, unsigned int shndx
)
3701 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
3702 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3703 return this->u2_
.posd
->add_input_section(object
, shndx
);
3706 // Given an input OBJECT, an input section index SHNDX within that
3707 // object, and an OFFSET relative to the start of that input
3708 // section, return whether or not the output offset is known. If
3709 // this function returns true, it sets *POUTPUT to the offset in
3710 // the output section, relative to the start of the input section
3711 // in the output section. *POUTPUT may be different from OFFSET
3712 // for a merged section.
3714 output_offset(const Relobj
* object
, unsigned int shndx
,
3715 section_offset_type offset
,
3716 section_offset_type
* poutput
) const;
3718 // Return whether this is the merge section for the input section
3721 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const;
3723 // Write out the data. This does nothing for an input section.
3725 write(Output_file
*);
3727 // Write the data to a buffer. This does nothing for an input
3730 write_to_buffer(unsigned char*);
3732 // Print to a map file.
3734 print_to_mapfile(Mapfile
*) const;
3736 // Print statistics about merge sections to stderr.
3738 print_merge_stats(const char* section_name
)
3740 if (this->shndx_
== MERGE_DATA_SECTION_CODE
3741 || this->shndx_
== MERGE_STRING_SECTION_CODE
)
3742 this->u2_
.posd
->print_merge_stats(section_name
);
3746 // Code values which appear in shndx_. If the value is not one of
3747 // these codes, it is the input section index in the object file.
3750 // An Output_section_data.
3751 OUTPUT_SECTION_CODE
= -1U,
3752 // An Output_section_data for an SHF_MERGE section with
3753 // SHF_STRINGS not set.
3754 MERGE_DATA_SECTION_CODE
= -2U,
3755 // An Output_section_data for an SHF_MERGE section with
3757 MERGE_STRING_SECTION_CODE
= -3U,
3758 // An Output_section_data for a relaxed input section.
3759 RELAXED_INPUT_SECTION_CODE
= -4U
3762 // For an ordinary input section, this is the section index in the
3763 // input file. For an Output_section_data, this is
3764 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3765 // MERGE_STRING_SECTION_CODE.
3766 unsigned int shndx_
;
3767 // The required alignment, stored as a power of 2.
3768 unsigned int p2align_
;
3771 // For an ordinary input section, the section size.
3773 // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
3774 // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
3780 // For an ordinary input section, the object which holds the
3783 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3784 // MERGE_STRING_SECTION_CODE, the data.
3785 Output_section_data
* posd
;
3786 Output_merge_base
* pomb
;
3787 // For RELAXED_INPUT_SECTION_CODE, the data.
3788 Output_relaxed_input_section
* poris
;
3790 // The line number of the pattern it matches in the --section-ordering-file
3791 // file. It is 0 if does not match any pattern.
3792 unsigned int section_order_index_
;
3795 // Store the list of input sections for this Output_section into the
3796 // list passed in. This removes the input sections, leaving only
3797 // any Output_section_data elements. This returns the size of those
3798 // Output_section_data elements. ADDRESS is the address of this
3799 // output section. FILL is the fill value to use, in case there are
3800 // any spaces between the remaining Output_section_data elements.
3802 get_input_sections(uint64_t address
, const std::string
& fill
,
3803 std::list
<Input_section
>*);
3805 // Add a script input section. A script input section can either be
3806 // a plain input section or a sub-class of Output_section_data.
3808 add_script_input_section(const Input_section
& input_section
);
3810 // Set the current size of the output section.
3812 set_current_data_size(off_t size
)
3813 { this->set_current_data_size_for_child(size
); }
3815 // End of linker script support.
3817 // Save states before doing section layout.
3818 // This is used for relaxation.
3822 // Restore states prior to section layout.
3830 // Convert existing input sections to relaxed input sections.
3832 convert_input_sections_to_relaxed_sections(
3833 const std::vector
<Output_relaxed_input_section
*>& sections
);
3835 // Find a relaxed input section to an input section in OBJECT
3836 // with index SHNDX. Return NULL if none is found.
3837 const Output_relaxed_input_section
*
3838 find_relaxed_input_section(const Relobj
* object
, unsigned int shndx
) const;
3840 // Whether section offsets need adjustment due to relaxation.
3842 section_offsets_need_adjustment() const
3843 { return this->section_offsets_need_adjustment_
; }
3845 // Set section_offsets_need_adjustment to be true.
3847 set_section_offsets_need_adjustment()
3848 { this->section_offsets_need_adjustment_
= true; }
3850 // Set section_offsets_need_adjustment to be false.
3852 clear_section_offsets_need_adjustment()
3853 { this->section_offsets_need_adjustment_
= false; }
3855 // Adjust section offsets of input sections in this. This is
3856 // requires if relaxation caused some input sections to change sizes.
3858 adjust_section_offsets();
3860 // Whether this is a NOLOAD section.
3863 { return this->is_noload_
; }
3868 { this->is_noload_
= true; }
3870 // Print merge statistics to stderr.
3872 print_merge_stats();
3874 // Set a fixed layout for the section. Used for incremental update links.
3876 set_fixed_layout(uint64_t sh_addr
, off_t sh_offset
, off_t sh_size
,
3877 uint64_t sh_addralign
);
3879 // Return TRUE if the section has a fixed layout.
3881 has_fixed_layout() const
3882 { return this->has_fixed_layout_
; }
3884 // Set flag to allow patch space for this section. Used for full
3885 // incremental links.
3887 set_is_patch_space_allowed()
3888 { this->is_patch_space_allowed_
= true; }
3890 // Set a fill method to use for free space left in the output section
3891 // during incremental links.
3893 set_free_space_fill(Output_fill
* free_space_fill
)
3895 this->free_space_fill_
= free_space_fill
;
3896 this->free_list_
.set_min_hole_size(free_space_fill
->minimum_hole_size());
3899 // Reserve space within the fixed layout for the section. Used for
3900 // incremental update links.
3902 reserve(uint64_t sh_offset
, uint64_t sh_size
);
3904 // Allocate space from the free list for the section. Used for
3905 // incremental update links.
3907 allocate(off_t len
, uint64_t addralign
);
3909 typedef std::vector
<Input_section
> Input_section_list
;
3911 // Allow access to the input sections.
3912 const Input_section_list
&
3913 input_sections() const
3914 { return this->input_sections_
; }
3917 // Return the output section--i.e., the object itself.
3922 const Output_section
*
3923 do_output_section() const
3926 // Return the section index in the output file.
3928 do_out_shndx() const
3930 gold_assert(this->out_shndx_
!= -1U);
3931 return this->out_shndx_
;
3934 // Set the output section index.
3936 do_set_out_shndx(unsigned int shndx
)
3938 gold_assert(this->out_shndx_
== -1U || this->out_shndx_
== shndx
);
3939 this->out_shndx_
= shndx
;
3942 // Update the data size of the Output_section. For a typical
3943 // Output_section, there is nothing to do, but if there are any
3944 // Output_section_data objects we need to do a trial layout
3949 // Set the final data size of the Output_section. For a typical
3950 // Output_section, there is nothing to do, but if there are any
3951 // Output_section_data objects we need to set their final addresses
3954 set_final_data_size();
3956 // Reset the address and file offset.
3958 do_reset_address_and_file_offset();
3960 // Return true if address and file offset already have reset values. In
3961 // other words, calling reset_address_and_file_offset will not change them.
3963 do_address_and_file_offset_have_reset_values() const;
3965 // Write the data to the file. For a typical Output_section, this
3966 // does nothing: the data is written out by calling Object::Relocate
3967 // on each input object. But if there are any Output_section_data
3968 // objects we do need to write them out here.
3970 do_write(Output_file
*);
3972 // Return the address alignment--function required by parent class.
3974 do_addralign() const
3975 { return this->addralign_
; }
3977 // Return whether there is a load address.
3979 do_has_load_address() const
3980 { return this->has_load_address_
; }
3982 // Return the load address.
3984 do_load_address() const
3986 gold_assert(this->has_load_address_
);
3987 return this->load_address_
;
3990 // Return whether this is an Output_section.
3992 do_is_section() const
3995 // Return whether this is a section of the specified type.
3997 do_is_section_type(elfcpp::Elf_Word type
) const
3998 { return this->type_
== type
; }
4000 // Return whether the specified section flag is set.
4002 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
4003 { return (this->flags_
& flag
) != 0; }
4005 // Set the TLS offset. Called only for SHT_TLS sections.
4007 do_set_tls_offset(uint64_t tls_base
);
4009 // Return the TLS offset, relative to the base of the TLS segment.
4010 // Valid only for SHT_TLS sections.
4012 do_tls_offset() const
4013 { return this->tls_offset_
; }
4015 // This may be implemented by a child class.
4017 do_finalize_name(Layout
*)
4020 // Print to the map file.
4022 do_print_to_mapfile(Mapfile
*) const;
4024 // Record that this section requires postprocessing after all
4025 // relocations have been applied. This is called by a child class.
4027 set_requires_postprocessing()
4029 this->requires_postprocessing_
= true;
4030 this->after_input_sections_
= true;
4033 // Write all the data of an Output_section into the postprocessing
4036 write_to_postprocessing_buffer();
4038 // Whether this always keeps an input section list
4040 always_keeps_input_sections() const
4041 { return this->always_keeps_input_sections_
; }
4043 // Always keep an input section list.
4045 set_always_keeps_input_sections()
4047 gold_assert(this->current_data_size_for_child() == 0);
4048 this->always_keeps_input_sections_
= true;
4052 // We only save enough information to undo the effects of section layout.
4053 class Checkpoint_output_section
4056 Checkpoint_output_section(uint64_t addralign
, elfcpp::Elf_Xword flags
,
4057 const Input_section_list
& input_sections
,
4058 off_t first_input_offset
,
4059 bool attached_input_sections_are_sorted
)
4060 : addralign_(addralign
), flags_(flags
),
4061 input_sections_(input_sections
),
4062 input_sections_size_(input_sections_
.size()),
4063 input_sections_copy_(), first_input_offset_(first_input_offset
),
4064 attached_input_sections_are_sorted_(attached_input_sections_are_sorted
)
4068 ~Checkpoint_output_section()
4071 // Return the address alignment.
4074 { return this->addralign_
; }
4077 set_addralign(uint64_t val
)
4078 { this->addralign_
= val
; }
4080 // Return the section flags.
4083 { return this->flags_
; }
4085 // Return a reference to the input section list copy.
4088 { return &this->input_sections_copy_
; }
4090 // Return the size of input_sections at the time when checkpoint is
4093 input_sections_size() const
4094 { return this->input_sections_size_
; }
4096 // Whether input sections are copied.
4098 input_sections_saved() const
4099 { return this->input_sections_copy_
.size() == this->input_sections_size_
; }
4102 first_input_offset() const
4103 { return this->first_input_offset_
; }
4106 attached_input_sections_are_sorted() const
4107 { return this->attached_input_sections_are_sorted_
; }
4109 // Save input sections.
4111 save_input_sections()
4113 this->input_sections_copy_
.reserve(this->input_sections_size_
);
4114 this->input_sections_copy_
.clear();
4115 Input_section_list::const_iterator p
= this->input_sections_
.begin();
4116 gold_assert(this->input_sections_size_
>= this->input_sections_
.size());
4117 for(size_t i
= 0; i
< this->input_sections_size_
; i
++, ++p
)
4118 this->input_sections_copy_
.push_back(*p
);
4122 // The section alignment.
4123 uint64_t addralign_
;
4124 // The section flags.
4125 elfcpp::Elf_Xword flags_
;
4126 // Reference to the input sections to be checkpointed.
4127 const Input_section_list
& input_sections_
;
4128 // Size of the checkpointed portion of input_sections_;
4129 size_t input_sections_size_
;
4130 // Copy of input sections.
4131 Input_section_list input_sections_copy_
;
4132 // The offset of the first entry in input_sections_.
4133 off_t first_input_offset_
;
4134 // True if the input sections attached to this output section have
4135 // already been sorted.
4136 bool attached_input_sections_are_sorted_
;
4139 // This class is used to sort the input sections.
4140 class Input_section_sort_entry
;
4142 // This is the sort comparison function for ctors and dtors.
4143 struct Input_section_sort_compare
4146 operator()(const Input_section_sort_entry
&,
4147 const Input_section_sort_entry
&) const;
4150 // This is the sort comparison function for .init_array and .fini_array.
4151 struct Input_section_sort_init_fini_compare
4154 operator()(const Input_section_sort_entry
&,
4155 const Input_section_sort_entry
&) const;
4158 // This is the sort comparison function when a section order is specified
4159 // from an input file.
4160 struct Input_section_sort_section_order_index_compare
4163 operator()(const Input_section_sort_entry
&,
4164 const Input_section_sort_entry
&) const;
4167 // Fill data. This is used to fill in data between input sections.
4168 // It is also used for data statements (BYTE, WORD, etc.) in linker
4169 // scripts. When we have to keep track of the input sections, we
4170 // can use an Output_data_const, but we don't want to have to keep
4171 // track of input sections just to implement fills.
4175 Fill(off_t section_offset
, off_t length
)
4176 : section_offset_(section_offset
),
4177 length_(convert_to_section_size_type(length
))
4180 // Return section offset.
4182 section_offset() const
4183 { return this->section_offset_
; }
4185 // Return fill length.
4188 { return this->length_
; }
4191 // The offset within the output section.
4192 off_t section_offset_
;
4193 // The length of the space to fill.
4194 section_size_type length_
;
4197 typedef std::vector
<Fill
> Fill_list
;
4199 // Map used during relaxation of existing sections. This map
4200 // a section id an input section list index. We assume that
4201 // Input_section_list is a vector.
4202 typedef Unordered_map
<Section_id
, size_t, Section_id_hash
> Relaxation_map
;
4204 // Add a new output section by Input_section.
4206 add_output_section_data(Input_section
*);
4208 // Add an SHF_MERGE input section. Returns true if the section was
4209 // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
4210 // stores information about the merged input sections.
4212 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
4213 uint64_t entsize
, uint64_t addralign
,
4214 bool keeps_input_sections
);
4216 // Add an output SHF_MERGE section POSD to this output section.
4217 // IS_STRING indicates whether it is a SHF_STRINGS section, and
4218 // ENTSIZE is the entity size. This returns the entry added to
4221 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
4224 // Sort the attached input sections.
4226 sort_attached_input_sections();
4228 // Find the merge section into which an input section with index SHNDX in
4229 // OBJECT has been added. Return NULL if none found.
4230 Output_section_data
*
4231 find_merge_section(const Relobj
* object
, unsigned int shndx
) const;
4233 // Build a relaxation map.
4235 build_relaxation_map(
4236 const Input_section_list
& input_sections
,
4238 Relaxation_map
* map
) const;
4240 // Convert input sections in an input section list into relaxed sections.
4242 convert_input_sections_in_list_to_relaxed_sections(
4243 const std::vector
<Output_relaxed_input_section
*>& relaxed_sections
,
4244 const Relaxation_map
& map
,
4245 Input_section_list
* input_sections
);
4247 // Build the lookup maps for merge and relaxed input sections.
4249 build_lookup_maps() const;
4251 // Most of these fields are only valid after layout.
4253 // The name of the section. This will point into a Stringpool.
4255 // The section address is in the parent class.
4256 // The section alignment.
4257 uint64_t addralign_
;
4258 // The section entry size.
4260 // The load address. This is only used when using a linker script
4261 // with a SECTIONS clause. The has_load_address_ field indicates
4262 // whether this field is valid.
4263 uint64_t load_address_
;
4264 // The file offset is in the parent class.
4265 // Set the section link field to the index of this section.
4266 const Output_data
* link_section_
;
4267 // If link_section_ is NULL, this is the link field.
4269 // Set the section info field to the index of this section.
4270 const Output_section
* info_section_
;
4271 // If info_section_ is NULL, set the info field to the symbol table
4272 // index of this symbol.
4273 const Symbol
* info_symndx_
;
4274 // If info_section_ and info_symndx_ are NULL, this is the section
4277 // The section type.
4278 const elfcpp::Elf_Word type_
;
4279 // The section flags.
4280 elfcpp::Elf_Xword flags_
;
4281 // The order of this section in the output segment.
4282 Output_section_order order_
;
4283 // The section index.
4284 unsigned int out_shndx_
;
4285 // If there is a STT_SECTION for this output section in the normal
4286 // symbol table, this is the symbol index. This starts out as zero.
4287 // It is initialized in Layout::finalize() to be the index, or -1U
4288 // if there isn't one.
4289 unsigned int symtab_index_
;
4290 // If there is a STT_SECTION for this output section in the dynamic
4291 // symbol table, this is the symbol index. This starts out as zero.
4292 // It is initialized in Layout::finalize() to be the index, or -1U
4293 // if there isn't one.
4294 unsigned int dynsym_index_
;
4295 // The input sections. This will be empty in cases where we don't
4296 // need to keep track of them.
4297 Input_section_list input_sections_
;
4298 // The offset of the first entry in input_sections_.
4299 off_t first_input_offset_
;
4300 // The fill data. This is separate from input_sections_ because we
4301 // often will need fill sections without needing to keep track of
4304 // If the section requires postprocessing, this buffer holds the
4305 // section contents during relocation.
4306 unsigned char* postprocessing_buffer_
;
4307 // Whether this output section needs a STT_SECTION symbol in the
4308 // normal symbol table. This will be true if there is a relocation
4310 bool needs_symtab_index_
: 1;
4311 // Whether this output section needs a STT_SECTION symbol in the
4312 // dynamic symbol table. This will be true if there is a dynamic
4313 // relocation which needs it.
4314 bool needs_dynsym_index_
: 1;
4315 // Whether the link field of this output section should point to the
4316 // normal symbol table.
4317 bool should_link_to_symtab_
: 1;
4318 // Whether the link field of this output section should point to the
4319 // dynamic symbol table.
4320 bool should_link_to_dynsym_
: 1;
4321 // Whether this section should be written after all the input
4322 // sections are complete.
4323 bool after_input_sections_
: 1;
4324 // Whether this section requires post processing after all
4325 // relocations have been applied.
4326 bool requires_postprocessing_
: 1;
4327 // Whether an input section was mapped to this output section
4328 // because of a SECTIONS clause in a linker script.
4329 bool found_in_sections_clause_
: 1;
4330 // Whether this section has an explicitly specified load address.
4331 bool has_load_address_
: 1;
4332 // True if the info_section_ field means the section index of the
4333 // section, false if it means the symbol index of the corresponding
4335 bool info_uses_section_index_
: 1;
4336 // True if input sections attached to this output section have to be
4337 // sorted according to a specified order.
4338 bool input_section_order_specified_
: 1;
4339 // True if the input sections attached to this output section may
4341 bool may_sort_attached_input_sections_
: 1;
4342 // True if the input sections attached to this output section must
4344 bool must_sort_attached_input_sections_
: 1;
4345 // True if the input sections attached to this output section have
4346 // already been sorted.
4347 bool attached_input_sections_are_sorted_
: 1;
4348 // True if this section holds relro data.
4350 // True if this is a small section.
4351 bool is_small_section_
: 1;
4352 // True if this is a large section.
4353 bool is_large_section_
: 1;
4354 // Whether code-fills are generated at write.
4355 bool generate_code_fills_at_write_
: 1;
4356 // Whether the entry size field should be zero.
4357 bool is_entsize_zero_
: 1;
4358 // Whether section offsets need adjustment due to relaxation.
4359 bool section_offsets_need_adjustment_
: 1;
4360 // Whether this is a NOLOAD section.
4361 bool is_noload_
: 1;
4362 // Whether this always keeps input section.
4363 bool always_keeps_input_sections_
: 1;
4364 // Whether this section has a fixed layout, for incremental update links.
4365 bool has_fixed_layout_
: 1;
4366 // True if we can add patch space to this section.
4367 bool is_patch_space_allowed_
: 1;
4368 // True if this output section goes into a unique segment.
4369 bool is_unique_segment_
: 1;
4370 // For SHT_TLS sections, the offset of this section relative to the base
4371 // of the TLS segment.
4372 uint64_t tls_offset_
;
4373 // Additional segment flags, specified via linker plugin, when mapping some
4374 // input sections to unique segments.
4375 uint64_t extra_segment_flags_
;
4376 // Segment alignment specified via linker plugin, when mapping some
4377 // input sections to unique segments.
4378 uint64_t segment_alignment_
;
4379 // Saved checkpoint.
4380 Checkpoint_output_section
* checkpoint_
;
4381 // Fast lookup maps for merged and relaxed input sections.
4382 Output_section_lookup_maps
* lookup_maps_
;
4383 // List of available regions within the section, for incremental
4385 Free_list free_list_
;
4386 // Method for filling chunks of free space.
4387 Output_fill
* free_space_fill_
;
4388 // Amount added as patch space for incremental linking.
4392 // An output segment. PT_LOAD segments are built from collections of
4393 // output sections. Other segments typically point within PT_LOAD
4394 // segments, and are built directly as needed.
4396 // NOTE: We want to use the copy constructor for this class. During
4397 // relaxation, we may try built the segments multiple times. We do
4398 // that by copying the original segment list before lay-out, doing
4399 // a trial lay-out and roll-back to the saved copied if we need to
4400 // to the lay-out again.
4402 class Output_segment
4405 // Create an output segment, specifying the type and flags.
4406 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
4408 // Return the virtual address.
4411 { return this->vaddr_
; }
4413 // Return the physical address.
4416 { return this->paddr_
; }
4418 // Return the segment type.
4421 { return this->type_
; }
4423 // Return the segment flags.
4426 { return this->flags_
; }
4428 // Return the memory size.
4431 { return this->memsz_
; }
4433 // Return the file size.
4436 { return this->filesz_
; }
4438 // Return the file offset.
4441 { return this->offset_
; }
4443 // Whether this is a segment created to hold large data sections.
4445 is_large_data_segment() const
4446 { return this->is_large_data_segment_
; }
4448 // Record that this is a segment created to hold large data
4451 set_is_large_data_segment()
4452 { this->is_large_data_segment_
= true; }
4455 is_unique_segment() const
4456 { return this->is_unique_segment_
; }
4458 // Mark segment as unique, happens when linker plugins request that
4459 // certain input sections be mapped to unique segments.
4461 set_is_unique_segment()
4462 { this->is_unique_segment_
= true; }
4464 // Return the maximum alignment of the Output_data.
4466 maximum_alignment();
4468 // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
4469 // the segment flags to use.
4471 add_output_section_to_load(Layout
* layout
, Output_section
* os
,
4472 elfcpp::Elf_Word seg_flags
);
4474 // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
4475 // is the segment flags to use.
4477 add_output_section_to_nonload(Output_section
* os
,
4478 elfcpp::Elf_Word seg_flags
);
4480 // Remove an Output_section from this segment. It is an error if it
4483 remove_output_section(Output_section
* os
);
4485 // Add an Output_data (which need not be an Output_section) to the
4486 // start of this segment.
4488 add_initial_output_data(Output_data
*);
4490 // Return true if this segment has any sections which hold actual
4491 // data, rather than being a BSS section.
4493 has_any_data_sections() const;
4495 // Whether this segment has a dynamic relocs.
4497 has_dynamic_reloc() const;
4499 // Return the first section.
4501 first_section() const;
4503 // Return the address of the first section.
4505 first_section_load_address() const
4507 const Output_section
* os
= this->first_section();
4508 return os
->has_load_address() ? os
->load_address() : os
->address();
4511 // Return whether the addresses have been set already.
4513 are_addresses_set() const
4514 { return this->are_addresses_set_
; }
4516 // Set the addresses.
4518 set_addresses(uint64_t vaddr
, uint64_t paddr
)
4520 this->vaddr_
= vaddr
;
4521 this->paddr_
= paddr
;
4522 this->are_addresses_set_
= true;
4525 // Update the flags for the flags of an output section added to this
4528 update_flags_for_output_section(elfcpp::Elf_Xword flags
)
4530 // The ELF ABI specifies that a PT_TLS segment should always have
4531 // PF_R as the flags.
4532 if (this->type() != elfcpp::PT_TLS
)
4533 this->flags_
|= flags
;
4536 // Set the segment flags. This is only used if we have a PHDRS
4537 // clause which explicitly specifies the flags.
4539 set_flags(elfcpp::Elf_Word flags
)
4540 { this->flags_
= flags
; }
4542 // Set the address of the segment to ADDR and the offset to *POFF
4543 // and set the addresses and offsets of all contained output
4544 // sections accordingly. Set the section indexes of all contained
4545 // output sections starting with *PSHNDX. If RESET is true, first
4546 // reset the addresses of the contained sections. Return the
4547 // address of the immediately following segment. Update *POFF and
4548 // *PSHNDX. This should only be called for a PT_LOAD segment.
4550 set_section_addresses(Layout
*, bool reset
, uint64_t addr
,
4551 unsigned int* increase_relro
, bool* has_relro
,
4552 off_t
* poff
, unsigned int* pshndx
);
4554 // Set the minimum alignment of this segment. This may be adjusted
4555 // upward based on the section alignments.
4557 set_minimum_p_align(uint64_t align
)
4559 if (align
> this->min_p_align_
)
4560 this->min_p_align_
= align
;
4563 // Set the offset of this segment based on the section. This should
4564 // only be called for a non-PT_LOAD segment.
4566 set_offset(unsigned int increase
);
4568 // Set the TLS offsets of the sections contained in the PT_TLS segment.
4572 // Return the number of output sections.
4574 output_section_count() const;
4576 // Return the section attached to the list segment with the lowest
4577 // load address. This is used when handling a PHDRS clause in a
4580 section_with_lowest_load_address() const;
4582 // Write the segment header into *OPHDR.
4583 template<int size
, bool big_endian
>
4585 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
4587 // Write the section headers of associated sections into V.
4588 template<int size
, bool big_endian
>
4590 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
4591 unsigned int* pshndx
) const;
4593 // Print the output sections in the map file.
4595 print_sections_to_mapfile(Mapfile
*) const;
4598 typedef std::vector
<Output_data
*> Output_data_list
;
4600 // Find the maximum alignment in an Output_data_list.
4602 maximum_alignment_list(const Output_data_list
*);
4604 // Return whether the first data section is a relro section.
4606 is_first_section_relro() const;
4608 // Set the section addresses in an Output_data_list.
4610 set_section_list_addresses(Layout
*, bool reset
, Output_data_list
*,
4611 uint64_t addr
, off_t
* poff
, unsigned int* pshndx
,
4614 // Return the number of Output_sections in an Output_data_list.
4616 output_section_count_list(const Output_data_list
*) const;
4618 // Return whether an Output_data_list has a dynamic reloc.
4620 has_dynamic_reloc_list(const Output_data_list
*) const;
4622 // Find the section with the lowest load address in an
4623 // Output_data_list.
4625 lowest_load_address_in_list(const Output_data_list
* pdl
,
4626 Output_section
** found
,
4627 uint64_t* found_lma
) const;
4629 // Find the first and last entries by address.
4631 find_first_and_last_list(const Output_data_list
* pdl
,
4632 const Output_data
** pfirst
,
4633 const Output_data
** plast
) const;
4635 // Write the section headers in the list into V.
4636 template<int size
, bool big_endian
>
4638 write_section_headers_list(const Layout
*, const Stringpool
*,
4639 const Output_data_list
*, unsigned char* v
,
4640 unsigned int* pshdx
) const;
4642 // Print a section list to the mapfile.
4644 print_section_list_to_mapfile(Mapfile
*, const Output_data_list
*) const;
4646 // NOTE: We want to use the copy constructor. Currently, shallow copy
4647 // works for us so we do not need to write our own copy constructor.
4649 // The list of output data attached to this segment.
4650 Output_data_list output_lists_
[ORDER_MAX
];
4651 // The segment virtual address.
4653 // The segment physical address.
4655 // The size of the segment in memory.
4657 // The maximum section alignment. The is_max_align_known_ field
4658 // indicates whether this has been finalized.
4659 uint64_t max_align_
;
4660 // The required minimum value for the p_align field. This is used
4661 // for PT_LOAD segments. Note that this does not mean that
4662 // addresses should be aligned to this value; it means the p_paddr
4663 // and p_vaddr fields must be congruent modulo this value. For
4664 // non-PT_LOAD segments, the dynamic linker works more efficiently
4665 // if the p_align field has the more conventional value, although it
4666 // can align as needed.
4667 uint64_t min_p_align_
;
4668 // The offset of the segment data within the file.
4670 // The size of the segment data in the file.
4672 // The segment type;
4673 elfcpp::Elf_Word type_
;
4674 // The segment flags.
4675 elfcpp::Elf_Word flags_
;
4676 // Whether we have finalized max_align_.
4677 bool is_max_align_known_
: 1;
4678 // Whether vaddr and paddr were set by a linker script.
4679 bool are_addresses_set_
: 1;
4680 // Whether this segment holds large data sections.
4681 bool is_large_data_segment_
: 1;
4682 // Whether this was marked as a unique segment via a linker plugin.
4683 bool is_unique_segment_
: 1;
4686 // This class represents the output file.
4691 Output_file(const char* name
);
4693 // Indicate that this is a temporary file which should not be
4697 { this->is_temporary_
= true; }
4699 // Try to open an existing file. Returns false if the file doesn't
4700 // exist, has a size of 0 or can't be mmaped. This method is
4701 // thread-unsafe. If BASE_NAME is not NULL, use the contents of
4702 // that file as the base for incremental linking.
4704 open_base_file(const char* base_name
, bool writable
);
4706 // Open the output file. FILE_SIZE is the final size of the file.
4707 // If the file already exists, it is deleted/truncated. This method
4708 // is thread-unsafe.
4710 open(off_t file_size
);
4712 // Resize the output file. This method is thread-unsafe.
4714 resize(off_t file_size
);
4716 // Close the output file (flushing all buffered data) and make sure
4717 // there are no errors. This method is thread-unsafe.
4721 // Return the size of this file.
4724 { return this->file_size_
; }
4726 // Return the name of this file.
4729 { return this->name_
; }
4731 // We currently always use mmap which makes the view handling quite
4732 // simple. In the future we may support other approaches.
4734 // Write data to the output file.
4736 write(off_t offset
, const void* data
, size_t len
)
4737 { memcpy(this->base_
+ offset
, data
, len
); }
4739 // Get a buffer to use to write to the file, given the offset into
4740 // the file and the size.
4742 get_output_view(off_t start
, size_t size
)
4744 gold_assert(start
>= 0
4745 && start
+ static_cast<off_t
>(size
) <= this->file_size_
);
4746 return this->base_
+ start
;
4749 // VIEW must have been returned by get_output_view. Write the
4750 // buffer to the file, passing in the offset and the size.
4752 write_output_view(off_t
, size_t, unsigned char*)
4755 // Get a read/write buffer. This is used when we want to write part
4756 // of the file, read it in, and write it again.
4758 get_input_output_view(off_t start
, size_t size
)
4759 { return this->get_output_view(start
, size
); }
4761 // Write a read/write buffer back to the file.
4763 write_input_output_view(off_t
, size_t, unsigned char*)
4766 // Get a read buffer. This is used when we just want to read part
4767 // of the file back it in.
4768 const unsigned char*
4769 get_input_view(off_t start
, size_t size
)
4770 { return this->get_output_view(start
, size
); }
4772 // Release a read bfufer.
4774 free_input_view(off_t
, size_t, const unsigned char*)
4778 // Map the file into memory or, if that fails, allocate anonymous
4783 // Allocate anonymous memory for the file.
4787 // Map the file into memory.
4789 map_no_anonymous(bool);
4791 // Unmap the file from memory (and flush to disk buffers).
4801 // Base of file mapped into memory.
4802 unsigned char* base_
;
4803 // True iff base_ points to a memory buffer rather than an output file.
4804 bool map_is_anonymous_
;
4805 // True if base_ was allocated using new rather than mmap.
4806 bool map_is_allocated_
;
4807 // True if this is a temporary file which should not be output.
4811 } // End namespace gold.
4813 #endif // !defined(GOLD_OUTPUT_H)