1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
31 #include "reloc-types.h"
36 class General_options
;
41 class Relocatable_relocs
;
43 template<int size
, bool big_endian
>
45 template<int size
, bool big_endian
>
48 // An abtract class for data which has to go into the output file.
53 explicit Output_data()
54 : address_(0), data_size_(0), offset_(-1),
55 is_address_valid_(false), is_data_size_valid_(false),
56 is_offset_valid_(false),
57 dynamic_reloc_count_(0)
63 // Return the address. For allocated sections, this is only valid
64 // after Layout::finalize is finished.
68 gold_assert(this->is_address_valid_
);
69 return this->address_
;
72 // Return the size of the data. For allocated sections, this must
73 // be valid after Layout::finalize calls set_address, but need not
74 // be valid before then.
78 gold_assert(this->is_data_size_valid_
);
79 return this->data_size_
;
82 // Return the file offset. This is only valid after
83 // Layout::finalize is finished. For some non-allocated sections,
84 // it may not be valid until near the end of the link.
88 gold_assert(this->is_offset_valid_
);
92 // Reset the address and file offset. This essentially disables the
93 // sanity testing about duplicate and unknown settings.
95 reset_address_and_file_offset()
97 this->is_address_valid_
= false;
98 this->is_offset_valid_
= false;
99 this->is_data_size_valid_
= false;
100 this->do_reset_address_and_file_offset();
103 // Return the required alignment.
106 { return this->do_addralign(); }
108 // Return whether this has a load address.
110 has_load_address() const
111 { return this->do_has_load_address(); }
113 // Return the load address.
116 { return this->do_load_address(); }
118 // Return whether this is an Output_section.
121 { return this->do_is_section(); }
123 // Return whether this is an Output_section of the specified type.
125 is_section_type(elfcpp::Elf_Word stt
) const
126 { return this->do_is_section_type(stt
); }
128 // Return whether this is an Output_section with the specified flag
131 is_section_flag_set(elfcpp::Elf_Xword shf
) const
132 { return this->do_is_section_flag_set(shf
); }
134 // Return the output section that this goes in, if there is one.
137 { return this->do_output_section(); }
139 // Return the output section index, if there is an output section.
142 { return this->do_out_shndx(); }
144 // Set the output section index, if this is an output section.
146 set_out_shndx(unsigned int shndx
)
147 { this->do_set_out_shndx(shndx
); }
149 // Set the address and file offset of this data, and finalize the
150 // size of the data. This is called during Layout::finalize for
151 // allocated sections.
153 set_address_and_file_offset(uint64_t addr
, off_t off
)
155 this->set_address(addr
);
156 this->set_file_offset(off
);
157 this->finalize_data_size();
162 set_address(uint64_t addr
)
164 gold_assert(!this->is_address_valid_
);
165 this->address_
= addr
;
166 this->is_address_valid_
= true;
169 // Set the file offset.
171 set_file_offset(off_t off
)
173 gold_assert(!this->is_offset_valid_
);
175 this->is_offset_valid_
= true;
178 // Finalize the data size.
182 if (!this->is_data_size_valid_
)
184 // Tell the child class to set the data size.
185 this->set_final_data_size();
186 gold_assert(this->is_data_size_valid_
);
190 // Set the TLS offset. Called only for SHT_TLS sections.
192 set_tls_offset(uint64_t tls_base
)
193 { this->do_set_tls_offset(tls_base
); }
195 // Return the TLS offset, relative to the base of the TLS segment.
196 // Valid only for SHT_TLS sections.
199 { return this->do_tls_offset(); }
201 // Write the data to the output file. This is called after
202 // Layout::finalize is complete.
204 write(Output_file
* file
)
205 { this->do_write(file
); }
207 // This is called by Layout::finalize to note that the sizes of
208 // allocated sections must now be fixed.
211 { Output_data::allocated_sizes_are_fixed
= true; }
213 // Used to check that layout has been done.
216 { return Output_data::allocated_sizes_are_fixed
; }
218 // Count the number of dynamic relocations applied to this section.
221 { ++this->dynamic_reloc_count_
; }
223 // Return the number of dynamic relocations applied to this section.
225 dynamic_reloc_count() const
226 { return this->dynamic_reloc_count_
; }
228 // Whether the address is valid.
230 is_address_valid() const
231 { return this->is_address_valid_
; }
233 // Whether the file offset is valid.
235 is_offset_valid() const
236 { return this->is_offset_valid_
; }
238 // Whether the data size is valid.
240 is_data_size_valid() const
241 { return this->is_data_size_valid_
; }
244 // Functions that child classes may or in some cases must implement.
246 // Write the data to the output file.
248 do_write(Output_file
*) = 0;
250 // Return the required alignment.
252 do_addralign() const = 0;
254 // Return whether this has a load address.
256 do_has_load_address() const
259 // Return the load address.
261 do_load_address() const
262 { gold_unreachable(); }
264 // Return whether this is an Output_section.
266 do_is_section() const
269 // Return whether this is an Output_section of the specified type.
270 // This only needs to be implement by Output_section.
272 do_is_section_type(elfcpp::Elf_Word
) const
275 // Return whether this is an Output_section with the specific flag
276 // set. This only needs to be implemented by Output_section.
278 do_is_section_flag_set(elfcpp::Elf_Xword
) const
281 // Return the output section, if there is one.
282 virtual Output_section
*
286 // Return the output section index, if there is an output section.
289 { gold_unreachable(); }
291 // Set the output section index, if this is an output section.
293 do_set_out_shndx(unsigned int)
294 { gold_unreachable(); }
296 // This is a hook for derived classes to set the data size. This is
297 // called by finalize_data_size, normally called during
298 // Layout::finalize, when the section address is set.
300 set_final_data_size()
301 { gold_unreachable(); }
303 // A hook for resetting the address and file offset.
305 do_reset_address_and_file_offset()
308 // Set the TLS offset. Called only for SHT_TLS sections.
310 do_set_tls_offset(uint64_t)
311 { gold_unreachable(); }
313 // Return the TLS offset, relative to the base of the TLS segment.
314 // Valid only for SHT_TLS sections.
316 do_tls_offset() const
317 { gold_unreachable(); }
319 // Functions that child classes may call.
321 // Set the size of the data.
323 set_data_size(off_t data_size
)
325 gold_assert(!this->is_data_size_valid_
);
326 this->data_size_
= data_size
;
327 this->is_data_size_valid_
= true;
330 // Get the current data size--this is for the convenience of
331 // sections which build up their size over time.
333 current_data_size_for_child() const
334 { return this->data_size_
; }
336 // Set the current data size--this is for the convenience of
337 // sections which build up their size over time.
339 set_current_data_size_for_child(off_t data_size
)
341 gold_assert(!this->is_data_size_valid_
);
342 this->data_size_
= data_size
;
345 // Return default alignment for the target size.
349 // Return default alignment for a specified size--32 or 64.
351 default_alignment_for_size(int size
);
354 Output_data(const Output_data
&);
355 Output_data
& operator=(const Output_data
&);
357 // This is used for verification, to make sure that we don't try to
358 // change any sizes of allocated sections after we set the section
360 static bool allocated_sizes_are_fixed
;
362 // Memory address in output file.
364 // Size of data in output file.
366 // File offset of contents in output file.
368 // Whether address_ is valid.
369 bool is_address_valid_
;
370 // Whether data_size_ is valid.
371 bool is_data_size_valid_
;
372 // Whether offset_ is valid.
373 bool is_offset_valid_
;
374 // Count of dynamic relocations applied to this section.
375 unsigned int dynamic_reloc_count_
;
378 // Output the section headers.
380 class Output_section_headers
: public Output_data
383 Output_section_headers(const Layout
*,
384 const Layout::Segment_list
*,
385 const Layout::Section_list
*,
386 const Layout::Section_list
*,
390 // Write the data to the file.
392 do_write(Output_file
*);
394 // Return the required alignment.
397 { return Output_data::default_alignment(); }
400 // Write the data to the file with the right size and endianness.
401 template<int size
, bool big_endian
>
403 do_sized_write(Output_file
*);
405 const Layout
* layout_
;
406 const Layout::Segment_list
* segment_list_
;
407 const Layout::Section_list
* section_list_
;
408 const Layout::Section_list
* unattached_section_list_
;
409 const Stringpool
* secnamepool_
;
412 // Output the segment headers.
414 class Output_segment_headers
: public Output_data
417 Output_segment_headers(const Layout::Segment_list
& segment_list
);
420 // Write the data to the file.
422 do_write(Output_file
*);
424 // Return the required alignment.
427 { return Output_data::default_alignment(); }
430 // Write the data to the file with the right size and endianness.
431 template<int size
, bool big_endian
>
433 do_sized_write(Output_file
*);
435 const Layout::Segment_list
& segment_list_
;
438 // Output the ELF file header.
440 class Output_file_header
: public Output_data
443 Output_file_header(const Target
*,
445 const Output_segment_headers
*,
448 // Add information about the section headers. We lay out the ELF
449 // file header before we create the section headers.
450 void set_section_info(const Output_section_headers
*,
451 const Output_section
* shstrtab
);
454 // Write the data to the file.
456 do_write(Output_file
*);
458 // Return the required alignment.
461 { return Output_data::default_alignment(); }
464 // Write the data to the file with the right size and endianness.
465 template<int size
, bool big_endian
>
467 do_sized_write(Output_file
*);
469 // Return the value to use for the entry address.
471 typename
elfcpp::Elf_types
<size
>::Elf_Addr
474 const Target
* target_
;
475 const Symbol_table
* symtab_
;
476 const Output_segment_headers
* segment_header_
;
477 const Output_section_headers
* section_header_
;
478 const Output_section
* shstrtab_
;
482 // Output sections are mainly comprised of input sections. However,
483 // there are cases where we have data to write out which is not in an
484 // input section. Output_section_data is used in such cases. This is
485 // an abstract base class.
487 class Output_section_data
: public Output_data
490 Output_section_data(off_t data_size
, uint64_t addralign
)
491 : Output_data(), output_section_(NULL
), addralign_(addralign
)
492 { this->set_data_size(data_size
); }
494 Output_section_data(uint64_t addralign
)
495 : Output_data(), output_section_(NULL
), addralign_(addralign
)
498 // Return the output section.
499 const Output_section
*
500 output_section() const
501 { return this->output_section_
; }
503 // Record the output section.
505 set_output_section(Output_section
* os
);
507 // Add an input section, for SHF_MERGE sections. This returns true
508 // if the section was handled.
510 add_input_section(Relobj
* object
, unsigned int shndx
)
511 { return this->do_add_input_section(object
, shndx
); }
513 // Given an input OBJECT, an input section index SHNDX within that
514 // object, and an OFFSET relative to the start of that input
515 // section, return whether or not the corresponding offset within
516 // the output section is known. If this function returns true, it
517 // sets *POUTPUT to the output offset. The value -1 indicates that
518 // this input offset is being discarded.
520 output_offset(const Relobj
* object
, unsigned int shndx
,
521 section_offset_type offset
,
522 section_offset_type
*poutput
) const
523 { return this->do_output_offset(object
, shndx
, offset
, poutput
); }
525 // Return whether this is the merge section for the input section
526 // SHNDX in OBJECT. This should return true when output_offset
527 // would return true for some values of OFFSET.
529 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const
530 { return this->do_is_merge_section_for(object
, shndx
); }
532 // Write the contents to a buffer. This is used for sections which
533 // require postprocessing, such as compression.
535 write_to_buffer(unsigned char* buffer
)
536 { this->do_write_to_buffer(buffer
); }
538 // Print merge stats to stderr. This should only be called for
539 // SHF_MERGE sections.
541 print_merge_stats(const char* section_name
)
542 { this->do_print_merge_stats(section_name
); }
545 // The child class must implement do_write.
547 // The child class may implement specific adjustments to the output
550 do_adjust_output_section(Output_section
*)
553 // May be implemented by child class. Return true if the section
556 do_add_input_section(Relobj
*, unsigned int)
557 { gold_unreachable(); }
559 // The child class may implement output_offset.
561 do_output_offset(const Relobj
*, unsigned int, section_offset_type
,
562 section_offset_type
*) const
565 // The child class may implement is_merge_section_for.
567 do_is_merge_section_for(const Relobj
*, unsigned int) const
570 // The child class may implement write_to_buffer. Most child
571 // classes can not appear in a compressed section, and they do not
574 do_write_to_buffer(unsigned char*)
575 { gold_unreachable(); }
577 // Print merge statistics.
579 do_print_merge_stats(const char*)
580 { gold_unreachable(); }
582 // Return the required alignment.
585 { return this->addralign_
; }
587 // Return the output section.
590 { return this->output_section_
; }
592 // Return the section index of the output section.
594 do_out_shndx() const;
596 // Set the alignment.
598 set_addralign(uint64_t addralign
);
601 // The output section for this section.
602 Output_section
* output_section_
;
603 // The required alignment.
607 // Some Output_section_data classes build up their data step by step,
608 // rather than all at once. This class provides an interface for
611 class Output_section_data_build
: public Output_section_data
614 Output_section_data_build(uint64_t addralign
)
615 : Output_section_data(addralign
)
618 // Get the current data size.
620 current_data_size() const
621 { return this->current_data_size_for_child(); }
623 // Set the current data size.
625 set_current_data_size(off_t data_size
)
626 { this->set_current_data_size_for_child(data_size
); }
629 // Set the final data size.
631 set_final_data_size()
632 { this->set_data_size(this->current_data_size_for_child()); }
635 // A simple case of Output_data in which we have constant data to
638 class Output_data_const
: public Output_section_data
641 Output_data_const(const std::string
& data
, uint64_t addralign
)
642 : Output_section_data(data
.size(), addralign
), data_(data
)
645 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
646 : Output_section_data(len
, addralign
), data_(p
, len
)
649 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
650 : Output_section_data(len
, addralign
),
651 data_(reinterpret_cast<const char*>(p
), len
)
655 // Write the data to the output file.
657 do_write(Output_file
*);
659 // Write the data to a buffer.
661 do_write_to_buffer(unsigned char* buffer
)
662 { memcpy(buffer
, this->data_
.data(), this->data_
.size()); }
668 // Another version of Output_data with constant data, in which the
669 // buffer is allocated by the caller.
671 class Output_data_const_buffer
: public Output_section_data
674 Output_data_const_buffer(const unsigned char* p
, off_t len
,
676 : Output_section_data(len
, addralign
), p_(p
)
680 // Write the data the output file.
682 do_write(Output_file
*);
684 // Write the data to a buffer.
686 do_write_to_buffer(unsigned char* buffer
)
687 { memcpy(buffer
, this->p_
, this->data_size()); }
690 const unsigned char* p_
;
693 // A place holder for a fixed amount of data written out via some
696 class Output_data_fixed_space
: public Output_section_data
699 Output_data_fixed_space(off_t data_size
, uint64_t addralign
)
700 : Output_section_data(data_size
, addralign
)
704 // Write out the data--the actual data must be written out
707 do_write(Output_file
*)
711 // A place holder for variable sized data written out via some other
714 class Output_data_space
: public Output_section_data_build
717 explicit Output_data_space(uint64_t addralign
)
718 : Output_section_data_build(addralign
)
721 // Set the alignment.
723 set_space_alignment(uint64_t align
)
724 { this->set_addralign(align
); }
727 // Write out the data--the actual data must be written out
730 do_write(Output_file
*)
734 // A string table which goes into an output section.
736 class Output_data_strtab
: public Output_section_data
739 Output_data_strtab(Stringpool
* strtab
)
740 : Output_section_data(1), strtab_(strtab
)
744 // This is called to set the address and file offset. Here we make
745 // sure that the Stringpool is finalized.
747 set_final_data_size();
749 // Write out the data.
751 do_write(Output_file
*);
753 // Write the data to a buffer.
755 do_write_to_buffer(unsigned char* buffer
)
756 { this->strtab_
->write_to_buffer(buffer
, this->data_size()); }
762 // This POD class is used to represent a single reloc in the output
763 // file. This could be a private class within Output_data_reloc, but
764 // the templatization is complex enough that I broke it out into a
765 // separate class. The class is templatized on either elfcpp::SHT_REL
766 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
767 // relocation or an ordinary relocation.
769 // A relocation can be against a global symbol, a local symbol, a
770 // local section symbol, an output section, or the undefined symbol at
771 // index 0. We represent the latter by using a NULL global symbol.
773 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
776 template<bool dynamic
, int size
, bool big_endian
>
777 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
780 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
781 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
783 // An uninitialized entry. We need this because we want to put
784 // instances of this class into an STL container.
786 : local_sym_index_(INVALID_CODE
)
789 // We have a bunch of different constructors. They come in pairs
790 // depending on how the address of the relocation is specified. It
791 // can either be an offset in an Output_data or an offset in an
794 // A reloc against a global symbol.
796 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
797 Address address
, bool is_relative
);
799 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
800 unsigned int shndx
, Address address
, bool is_relative
);
802 // A reloc against a local symbol or local section symbol.
804 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
805 unsigned int local_sym_index
, unsigned int type
,
806 Output_data
* od
, Address address
, bool is_relative
,
807 bool is_section_symbol
);
809 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
810 unsigned int local_sym_index
, unsigned int type
,
811 unsigned int shndx
, Address address
, bool is_relative
,
812 bool is_section_symbol
);
814 // A reloc against the STT_SECTION symbol of an output section.
816 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
819 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
820 unsigned int shndx
, Address address
);
822 // Return TRUE if this is a RELATIVE relocation.
825 { return this->is_relative_
; }
827 // Return whether this is against a local section symbol.
829 is_local_section_symbol() const
831 return (this->local_sym_index_
!= GSYM_CODE
832 && this->local_sym_index_
!= SECTION_CODE
833 && this->local_sym_index_
!= INVALID_CODE
834 && this->is_section_symbol_
);
837 // For a local section symbol, return the offset of the input
838 // section within the output section. ADDEND is the addend being
839 // applied to the input section.
841 local_section_offset(Addend addend
) const;
843 // Get the value of the symbol referred to by a Rel relocation when
844 // we are adding the given ADDEND.
846 symbol_value(Addend addend
) const;
848 // Write the reloc entry to an output view.
850 write(unsigned char* pov
) const;
852 // Write the offset and info fields to Write_rel.
853 template<typename Write_rel
>
854 void write_rel(Write_rel
*) const;
857 // Record that we need a dynamic symbol index.
859 set_needs_dynsym_index();
861 // Return the symbol index.
863 get_symbol_index() const;
865 // Codes for local_sym_index_.
872 // Invalid uninitialized entry.
878 // For a local symbol or local section symbol
879 // (this->local_sym_index_ >= 0), the object. We will never
880 // generate a relocation against a local symbol in a dynamic
881 // object; that doesn't make sense. And our callers will always
882 // be templatized, so we use Sized_relobj here.
883 Sized_relobj
<size
, big_endian
>* relobj
;
884 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
885 // symbol. If this is NULL, it indicates a relocation against the
886 // undefined 0 symbol.
888 // For a relocation against an output section
889 // (this->local_sym_index_ == SECTION_CODE), the output section.
894 // If this->shndx_ is not INVALID CODE, the object which holds the
895 // input section being used to specify the reloc address.
897 // If this->shndx_ is INVALID_CODE, the output data being used to
898 // specify the reloc address. This may be NULL if the reloc
899 // address is absolute.
902 // The address offset within the input section or the Output_data.
904 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
905 // relocation against an output section, or INVALID_CODE for an
906 // uninitialized value. Otherwise, for a local symbol
907 // (this->is_section_symbol_ is false), the local symbol index. For
908 // a local section symbol (this->is_section_symbol_ is true), the
909 // section index in the input file.
910 unsigned int local_sym_index_
;
911 // The reloc type--a processor specific code.
912 unsigned int type_
: 30;
913 // True if the relocation is a RELATIVE relocation.
914 bool is_relative_
: 1;
915 // True if the relocation is against a section symbol.
916 bool is_section_symbol_
: 1;
917 // If the reloc address is an input section in an object, the
918 // section index. This is INVALID_CODE if the reloc address is
919 // specified in some other way.
923 // The SHT_RELA version of Output_reloc<>. This is just derived from
924 // the SHT_REL version of Output_reloc, but it adds an addend.
926 template<bool dynamic
, int size
, bool big_endian
>
927 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
930 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
931 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
933 // An uninitialized entry.
938 // A reloc against a global symbol.
940 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
941 Address address
, Addend addend
, bool is_relative
)
942 : rel_(gsym
, type
, od
, address
, is_relative
), addend_(addend
)
945 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
946 unsigned int shndx
, Address address
, Addend addend
,
948 : rel_(gsym
, type
, relobj
, shndx
, address
, is_relative
), addend_(addend
)
951 // A reloc against a local symbol.
953 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
954 unsigned int local_sym_index
, unsigned int type
,
955 Output_data
* od
, Address address
,
956 Addend addend
, bool is_relative
, bool is_section_symbol
)
957 : rel_(relobj
, local_sym_index
, type
, od
, address
, is_relative
,
962 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
963 unsigned int local_sym_index
, unsigned int type
,
964 unsigned int shndx
, Address address
,
965 Addend addend
, bool is_relative
, bool is_section_symbol
)
966 : rel_(relobj
, local_sym_index
, type
, shndx
, address
, is_relative
,
971 // A reloc against the STT_SECTION symbol of an output section.
973 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
974 Address address
, Addend addend
)
975 : rel_(os
, type
, od
, address
), addend_(addend
)
978 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
979 unsigned int shndx
, Address address
, Addend addend
)
980 : rel_(os
, type
, relobj
, shndx
, address
), addend_(addend
)
983 // Write the reloc entry to an output view.
985 write(unsigned char* pov
) const;
989 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
994 // Output_data_reloc is used to manage a section containing relocs.
995 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
996 // indicates whether this is a dynamic relocation or a normal
997 // relocation. Output_data_reloc_base is a base class.
998 // Output_data_reloc is the real class, which we specialize based on
1001 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1002 class Output_data_reloc_base
: public Output_section_data_build
1005 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
1006 typedef typename
Output_reloc_type::Address Address
;
1007 static const int reloc_size
=
1008 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
1010 // Construct the section.
1011 Output_data_reloc_base()
1012 : Output_section_data_build(Output_data::default_alignment_for_size(size
))
1016 // Write out the data.
1018 do_write(Output_file
*);
1020 // Set the entry size and the link.
1022 do_adjust_output_section(Output_section
*os
);
1024 // Add a relocation entry.
1026 add(Output_data
*od
, const Output_reloc_type
& reloc
)
1028 this->relocs_
.push_back(reloc
);
1029 this->set_current_data_size(this->relocs_
.size() * reloc_size
);
1030 od
->add_dynamic_reloc();
1034 typedef std::vector
<Output_reloc_type
> Relocs
;
1039 // The class which callers actually create.
1041 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1042 class Output_data_reloc
;
1044 // The SHT_REL version of Output_data_reloc.
1046 template<bool dynamic
, int size
, bool big_endian
>
1047 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1048 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1051 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
1055 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1056 typedef typename
Output_reloc_type::Address Address
;
1059 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>()
1062 // Add a reloc against a global symbol.
1065 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
1066 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false)); }
1069 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Relobj
* relobj
,
1070 unsigned int shndx
, Address address
)
1071 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1074 // These are to simplify the Copy_relocs class.
1077 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
,
1080 gold_assert(addend
== 0);
1081 this->add_global(gsym
, type
, od
, address
);
1085 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Relobj
* relobj
,
1086 unsigned int shndx
, Address address
, Address addend
)
1088 gold_assert(addend
== 0);
1089 this->add_global(gsym
, type
, od
, relobj
, shndx
, address
);
1092 // Add a RELATIVE reloc against a global symbol. The final relocation
1093 // will not reference the symbol.
1096 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1098 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, true)); }
1101 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1102 Relobj
* relobj
, unsigned int shndx
, Address address
)
1104 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1108 // Add a reloc against a local symbol.
1111 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1112 unsigned int local_sym_index
, unsigned int type
,
1113 Output_data
* od
, Address address
)
1115 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1116 address
, false, false));
1120 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1121 unsigned int local_sym_index
, unsigned int type
,
1122 Output_data
* od
, unsigned int shndx
, Address address
)
1124 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1125 address
, false, false));
1128 // Add a RELATIVE reloc against a local symbol.
1131 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1132 unsigned int local_sym_index
, unsigned int type
,
1133 Output_data
* od
, Address address
)
1135 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1136 address
, true, false));
1140 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1141 unsigned int local_sym_index
, unsigned int type
,
1142 Output_data
* od
, unsigned int shndx
, Address address
)
1144 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1145 address
, true, false));
1148 // Add a reloc against a local section symbol. This will be
1149 // converted into a reloc against the STT_SECTION symbol of the
1153 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1154 unsigned int input_shndx
, unsigned int type
,
1155 Output_data
* od
, Address address
)
1157 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
,
1158 address
, false, true));
1162 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1163 unsigned int input_shndx
, unsigned int type
,
1164 Output_data
* od
, unsigned int shndx
, Address address
)
1166 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1167 address
, false, true));
1170 // A reloc against the STT_SECTION symbol of an output section.
1171 // OS is the Output_section that the relocation refers to; OD is
1172 // the Output_data object being relocated.
1175 add_output_section(Output_section
* os
, unsigned int type
,
1176 Output_data
* od
, Address address
)
1177 { this->add(od
, Output_reloc_type(os
, type
, od
, address
)); }
1180 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1181 Relobj
* relobj
, unsigned int shndx
, Address address
)
1182 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
)); }
1185 // The SHT_RELA version of Output_data_reloc.
1187 template<bool dynamic
, int size
, bool big_endian
>
1188 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1189 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1192 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
1196 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1197 typedef typename
Output_reloc_type::Address Address
;
1198 typedef typename
Output_reloc_type::Addend Addend
;
1201 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>()
1204 // Add a reloc against a global symbol.
1207 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1208 Address address
, Addend addend
)
1209 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1213 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Relobj
* relobj
,
1214 unsigned int shndx
, Address address
,
1216 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1219 // Add a RELATIVE reloc against a global symbol. The final output
1220 // relocation will not reference the symbol, but we must keep the symbol
1221 // information long enough to set the addend of the relocation correctly
1222 // when it is written.
1225 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1226 Address address
, Addend addend
)
1227 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
, true)); }
1230 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1231 Relobj
* relobj
, unsigned int shndx
, Address address
,
1233 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1236 // Add a reloc against a local symbol.
1239 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1240 unsigned int local_sym_index
, unsigned int type
,
1241 Output_data
* od
, Address address
, Addend addend
)
1243 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1244 addend
, false, false));
1248 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1249 unsigned int local_sym_index
, unsigned int type
,
1250 Output_data
* od
, unsigned int shndx
, Address address
,
1253 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1254 address
, addend
, false, false));
1257 // Add a RELATIVE reloc against a local symbol.
1260 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1261 unsigned int local_sym_index
, unsigned int type
,
1262 Output_data
* od
, Address address
, Addend addend
)
1264 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1265 addend
, true, false));
1269 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1270 unsigned int local_sym_index
, unsigned int type
,
1271 Output_data
* od
, unsigned int shndx
, Address address
,
1274 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1275 address
, addend
, true, false));
1278 // Add a reloc against a local section symbol. This will be
1279 // converted into a reloc against the STT_SECTION symbol of the
1283 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1284 unsigned int input_shndx
, unsigned int type
,
1285 Output_data
* od
, Address address
, Addend addend
)
1287 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
, address
,
1288 addend
, false, true));
1292 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1293 unsigned int input_shndx
, unsigned int type
,
1294 Output_data
* od
, unsigned int shndx
, Address address
,
1297 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1298 address
, addend
, false, true));
1301 // A reloc against the STT_SECTION symbol of an output section.
1304 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1305 Address address
, Addend addend
)
1306 { this->add(os
, Output_reloc_type(os
, type
, od
, address
, addend
)); }
1309 add_output_section(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
1310 unsigned int shndx
, Address address
, Addend addend
)
1311 { this->add(os
, Output_reloc_type(os
, type
, relobj
, shndx
, address
,
1315 // Output_relocatable_relocs represents a relocation section in a
1316 // relocatable link. The actual data is written out in the target
1317 // hook relocate_for_relocatable. This just saves space for it.
1319 template<int sh_type
, int size
, bool big_endian
>
1320 class Output_relocatable_relocs
: public Output_section_data
1323 Output_relocatable_relocs(Relocatable_relocs
* rr
)
1324 : Output_section_data(Output_data::default_alignment_for_size(size
)),
1329 set_final_data_size();
1331 // Write out the data. There is nothing to do here.
1333 do_write(Output_file
*)
1337 // The relocs associated with this input section.
1338 Relocatable_relocs
* rr_
;
1341 // Handle a GROUP section.
1343 template<int size
, bool big_endian
>
1344 class Output_data_group
: public Output_section_data
1347 Output_data_group(Sized_relobj
<size
, big_endian
>* relobj
,
1348 section_size_type entry_count
,
1349 const elfcpp::Elf_Word
* contents
);
1352 do_write(Output_file
*);
1355 // The input object.
1356 Sized_relobj
<size
, big_endian
>* relobj_
;
1357 // The group flag word.
1358 elfcpp::Elf_Word flags_
;
1359 // The section indexes of the input sections in this group.
1360 std::vector
<unsigned int> input_sections_
;
1363 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1364 // for one symbol--either a global symbol or a local symbol in an
1365 // object. The target specific code adds entries to the GOT as
1368 template<int size
, bool big_endian
>
1369 class Output_data_got
: public Output_section_data_build
1372 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
1373 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, size
, big_endian
> Rel_dyn
;
1374 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
> Rela_dyn
;
1377 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1381 // Add an entry for a global symbol to the GOT. Return true if this
1382 // is a new GOT entry, false if the symbol was already in the GOT.
1384 add_global(Symbol
* gsym
, unsigned int got_type
);
1386 // Add an entry for a global symbol to the GOT, and add a dynamic
1387 // relocation of type R_TYPE for the GOT entry.
1389 add_global_with_rel(Symbol
* gsym
, unsigned int got_type
,
1390 Rel_dyn
* rel_dyn
, unsigned int r_type
);
1393 add_global_with_rela(Symbol
* gsym
, unsigned int got_type
,
1394 Rela_dyn
* rela_dyn
, unsigned int r_type
);
1396 // Add a pair of entries for a global symbol to the GOT, and add
1397 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1399 add_global_pair_with_rel(Symbol
* gsym
, unsigned int got_type
,
1400 Rel_dyn
* rel_dyn
, unsigned int r_type_1
,
1401 unsigned int r_type_2
);
1404 add_global_pair_with_rela(Symbol
* gsym
, unsigned int got_type
,
1405 Rela_dyn
* rela_dyn
, unsigned int r_type_1
,
1406 unsigned int r_type_2
);
1408 // Add an entry for a local symbol to the GOT. This returns true if
1409 // this is a new GOT entry, false if the symbol already has a GOT
1412 add_local(Sized_relobj
<size
, big_endian
>* object
, unsigned int sym_index
,
1413 unsigned int got_type
);
1415 // Add an entry for a local symbol to the GOT, and add a dynamic
1416 // relocation of type R_TYPE for the GOT entry.
1418 add_local_with_rel(Sized_relobj
<size
, big_endian
>* object
,
1419 unsigned int sym_index
, unsigned int got_type
,
1420 Rel_dyn
* rel_dyn
, unsigned int r_type
);
1423 add_local_with_rela(Sized_relobj
<size
, big_endian
>* object
,
1424 unsigned int sym_index
, unsigned int got_type
,
1425 Rela_dyn
* rela_dyn
, unsigned int r_type
);
1427 // Add a pair of entries for a local symbol to the GOT, and add
1428 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1430 add_local_pair_with_rel(Sized_relobj
<size
, big_endian
>* object
,
1431 unsigned int sym_index
, unsigned int shndx
,
1432 unsigned int got_type
, Rel_dyn
* rel_dyn
,
1433 unsigned int r_type_1
, unsigned int r_type_2
);
1436 add_local_pair_with_rela(Sized_relobj
<size
, big_endian
>* object
,
1437 unsigned int sym_index
, unsigned int shndx
,
1438 unsigned int got_type
, Rela_dyn
* rela_dyn
,
1439 unsigned int r_type_1
, unsigned int r_type_2
);
1441 // Add a constant to the GOT. This returns the offset of the new
1442 // entry from the start of the GOT.
1444 add_constant(Valtype constant
)
1446 this->entries_
.push_back(Got_entry(constant
));
1447 this->set_got_size();
1448 return this->last_got_offset();
1452 // Write out the GOT table.
1454 do_write(Output_file
*);
1457 // This POD class holds a single GOT entry.
1461 // Create a zero entry.
1463 : local_sym_index_(CONSTANT_CODE
)
1464 { this->u_
.constant
= 0; }
1466 // Create a global symbol entry.
1467 explicit Got_entry(Symbol
* gsym
)
1468 : local_sym_index_(GSYM_CODE
)
1469 { this->u_
.gsym
= gsym
; }
1471 // Create a local symbol entry.
1472 Got_entry(Sized_relobj
<size
, big_endian
>* object
,
1473 unsigned int local_sym_index
)
1474 : local_sym_index_(local_sym_index
)
1476 gold_assert(local_sym_index
!= GSYM_CODE
1477 && local_sym_index
!= CONSTANT_CODE
);
1478 this->u_
.object
= object
;
1481 // Create a constant entry. The constant is a host value--it will
1482 // be swapped, if necessary, when it is written out.
1483 explicit Got_entry(Valtype constant
)
1484 : local_sym_index_(CONSTANT_CODE
)
1485 { this->u_
.constant
= constant
; }
1487 // Write the GOT entry to an output view.
1489 write(unsigned char* pov
) const;
1500 // For a local symbol, the object.
1501 Sized_relobj
<size
, big_endian
>* object
;
1502 // For a global symbol, the symbol.
1504 // For a constant, the constant.
1507 // For a local symbol, the local symbol index. This is GSYM_CODE
1508 // for a global symbol, or CONSTANT_CODE for a constant.
1509 unsigned int local_sym_index_
;
1512 typedef std::vector
<Got_entry
> Got_entries
;
1514 // Return the offset into the GOT of GOT entry I.
1516 got_offset(unsigned int i
) const
1517 { return i
* (size
/ 8); }
1519 // Return the offset into the GOT of the last entry added.
1521 last_got_offset() const
1522 { return this->got_offset(this->entries_
.size() - 1); }
1524 // Set the size of the section.
1527 { this->set_current_data_size(this->got_offset(this->entries_
.size())); }
1529 // The list of GOT entries.
1530 Got_entries entries_
;
1533 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
1536 class Output_data_dynamic
: public Output_section_data
1539 Output_data_dynamic(Stringpool
* pool
)
1540 : Output_section_data(Output_data::default_alignment()),
1541 entries_(), pool_(pool
)
1544 // Add a new dynamic entry with a fixed numeric value.
1546 add_constant(elfcpp::DT tag
, unsigned int val
)
1547 { this->add_entry(Dynamic_entry(tag
, val
)); }
1549 // Add a new dynamic entry with the address of output data.
1551 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
1552 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
1554 // Add a new dynamic entry with the address of output data
1555 // plus a constant offset.
1557 add_section_plus_offset(elfcpp::DT tag
, const Output_data
* od
,
1558 unsigned int offset
)
1559 { this->add_entry(Dynamic_entry(tag
, od
, offset
)); }
1561 // Add a new dynamic entry with the size of output data.
1563 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
1564 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
1566 // Add a new dynamic entry with the address of a symbol.
1568 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
1569 { this->add_entry(Dynamic_entry(tag
, sym
)); }
1571 // Add a new dynamic entry with a string.
1573 add_string(elfcpp::DT tag
, const char* str
)
1574 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
1577 add_string(elfcpp::DT tag
, const std::string
& str
)
1578 { this->add_string(tag
, str
.c_str()); }
1581 // Adjust the output section to set the entry size.
1583 do_adjust_output_section(Output_section
*);
1585 // Set the final data size.
1587 set_final_data_size();
1589 // Write out the dynamic entries.
1591 do_write(Output_file
*);
1594 // This POD class holds a single dynamic entry.
1598 // Create an entry with a fixed numeric value.
1599 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
1600 : tag_(tag
), offset_(DYNAMIC_NUMBER
)
1601 { this->u_
.val
= val
; }
1603 // Create an entry with the size or address of a section.
1604 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
1606 offset_(section_size
1607 ? DYNAMIC_SECTION_SIZE
1608 : DYNAMIC_SECTION_ADDRESS
)
1609 { this->u_
.od
= od
; }
1611 // Create an entry with the address of a section plus a constant offset.
1612 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, unsigned int offset
)
1615 { this->u_
.od
= od
; }
1617 // Create an entry with the address of a symbol.
1618 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
1619 : tag_(tag
), offset_(DYNAMIC_SYMBOL
)
1620 { this->u_
.sym
= sym
; }
1622 // Create an entry with a string.
1623 Dynamic_entry(elfcpp::DT tag
, const char* str
)
1624 : tag_(tag
), offset_(DYNAMIC_STRING
)
1625 { this->u_
.str
= str
; }
1627 // Write the dynamic entry to an output view.
1628 template<int size
, bool big_endian
>
1630 write(unsigned char* pov
, const Stringpool
*) const;
1633 // Classification is encoded in the OFFSET field.
1637 DYNAMIC_SECTION_ADDRESS
= 0,
1639 DYNAMIC_NUMBER
= -1U,
1641 DYNAMIC_SECTION_SIZE
= -2U,
1643 DYNAMIC_SYMBOL
= -3U,
1645 DYNAMIC_STRING
= -4U
1646 // Any other value indicates a section address plus OFFSET.
1651 // For DYNAMIC_NUMBER.
1653 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
1654 const Output_data
* od
;
1655 // For DYNAMIC_SYMBOL.
1657 // For DYNAMIC_STRING.
1662 // The type of entry (Classification) or offset within a section.
1663 unsigned int offset_
;
1666 // Add an entry to the list.
1668 add_entry(const Dynamic_entry
& entry
)
1669 { this->entries_
.push_back(entry
); }
1671 // Sized version of write function.
1672 template<int size
, bool big_endian
>
1674 sized_write(Output_file
* of
);
1676 // The type of the list of entries.
1677 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
1680 Dynamic_entries entries_
;
1681 // The pool used for strings.
1685 // An output section. We don't expect to have too many output
1686 // sections, so we don't bother to do a template on the size.
1688 class Output_section
: public Output_data
1691 // Create an output section, giving the name, type, and flags.
1692 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
1693 virtual ~Output_section();
1695 // Add a new input section SHNDX, named NAME, with header SHDR, from
1696 // object OBJECT. RELOC_SHNDX is the index of a relocation section
1697 // which applies to this section, or 0 if none, or -1U if more than
1698 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
1699 // in a linker script; in that case we need to keep track of input
1700 // sections associated with an output section. Return the offset
1701 // within the output section.
1702 template<int size
, bool big_endian
>
1704 add_input_section(Sized_relobj
<size
, big_endian
>* object
, unsigned int shndx
,
1706 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1707 unsigned int reloc_shndx
, bool have_sections_script
);
1709 // Add generated data POSD to this output section.
1711 add_output_section_data(Output_section_data
* posd
);
1713 // Return the section name.
1716 { return this->name_
; }
1718 // Return the section type.
1721 { return this->type_
; }
1723 // Return the section flags.
1726 { return this->flags_
; }
1728 // Set the section flags. This may only be used with the Layout
1729 // code when it is prepared to move the section to a different
1732 set_flags(elfcpp::Elf_Xword flags
)
1733 { this->flags_
= flags
; }
1735 // Update the output section flags based on input section flags.
1737 update_flags_for_input_section(elfcpp::Elf_Xword flags
)
1739 this->flags_
|= (flags
1740 & (elfcpp::SHF_WRITE
1742 | elfcpp::SHF_EXECINSTR
));
1745 // Return the entsize field.
1748 { return this->entsize_
; }
1750 // Set the entsize field.
1752 set_entsize(uint64_t v
);
1754 // Set the load address.
1756 set_load_address(uint64_t load_address
)
1758 this->load_address_
= load_address
;
1759 this->has_load_address_
= true;
1762 // Set the link field to the output section index of a section.
1764 set_link_section(const Output_data
* od
)
1766 gold_assert(this->link_
== 0
1767 && !this->should_link_to_symtab_
1768 && !this->should_link_to_dynsym_
);
1769 this->link_section_
= od
;
1772 // Set the link field to a constant.
1774 set_link(unsigned int v
)
1776 gold_assert(this->link_section_
== NULL
1777 && !this->should_link_to_symtab_
1778 && !this->should_link_to_dynsym_
);
1782 // Record that this section should link to the normal symbol table.
1784 set_should_link_to_symtab()
1786 gold_assert(this->link_section_
== NULL
1788 && !this->should_link_to_dynsym_
);
1789 this->should_link_to_symtab_
= true;
1792 // Record that this section should link to the dynamic symbol table.
1794 set_should_link_to_dynsym()
1796 gold_assert(this->link_section_
== NULL
1798 && !this->should_link_to_symtab_
);
1799 this->should_link_to_dynsym_
= true;
1802 // Return the info field.
1806 gold_assert(this->info_section_
== NULL
1807 && this->info_symndx_
== NULL
);
1811 // Set the info field to the output section index of a section.
1813 set_info_section(const Output_section
* os
)
1815 gold_assert((this->info_section_
== NULL
1816 || (this->info_section_
== os
1817 && this->info_uses_section_index_
))
1818 && this->info_symndx_
== NULL
1819 && this->info_
== 0);
1820 this->info_section_
= os
;
1821 this->info_uses_section_index_
= true;
1824 // Set the info field to the symbol table index of a symbol.
1826 set_info_symndx(const Symbol
* sym
)
1828 gold_assert(this->info_section_
== NULL
1829 && (this->info_symndx_
== NULL
1830 || this->info_symndx_
== sym
)
1831 && this->info_
== 0);
1832 this->info_symndx_
= sym
;
1835 // Set the info field to the symbol table index of a section symbol.
1837 set_info_section_symndx(const Output_section
* os
)
1839 gold_assert((this->info_section_
== NULL
1840 || (this->info_section_
== os
1841 && !this->info_uses_section_index_
))
1842 && this->info_symndx_
== NULL
1843 && this->info_
== 0);
1844 this->info_section_
= os
;
1845 this->info_uses_section_index_
= false;
1848 // Set the info field to a constant.
1850 set_info(unsigned int v
)
1852 gold_assert(this->info_section_
== NULL
1853 && this->info_symndx_
== NULL
1854 && (this->info_
== 0
1855 || this->info_
== v
));
1859 // Set the addralign field.
1861 set_addralign(uint64_t v
)
1862 { this->addralign_
= v
; }
1864 // Indicate that we need a symtab index.
1866 set_needs_symtab_index()
1867 { this->needs_symtab_index_
= true; }
1869 // Return whether we need a symtab index.
1871 needs_symtab_index() const
1872 { return this->needs_symtab_index_
; }
1874 // Get the symtab index.
1876 symtab_index() const
1878 gold_assert(this->symtab_index_
!= 0);
1879 return this->symtab_index_
;
1882 // Set the symtab index.
1884 set_symtab_index(unsigned int index
)
1886 gold_assert(index
!= 0);
1887 this->symtab_index_
= index
;
1890 // Indicate that we need a dynsym index.
1892 set_needs_dynsym_index()
1893 { this->needs_dynsym_index_
= true; }
1895 // Return whether we need a dynsym index.
1897 needs_dynsym_index() const
1898 { return this->needs_dynsym_index_
; }
1900 // Get the dynsym index.
1902 dynsym_index() const
1904 gold_assert(this->dynsym_index_
!= 0);
1905 return this->dynsym_index_
;
1908 // Set the dynsym index.
1910 set_dynsym_index(unsigned int index
)
1912 gold_assert(index
!= 0);
1913 this->dynsym_index_
= index
;
1916 // Return whether the input sections sections attachd to this output
1917 // section may require sorting. This is used to handle constructor
1918 // priorities compatibly with GNU ld.
1920 may_sort_attached_input_sections() const
1921 { return this->may_sort_attached_input_sections_
; }
1923 // Record that the input sections attached to this output section
1924 // may require sorting.
1926 set_may_sort_attached_input_sections()
1927 { this->may_sort_attached_input_sections_
= true; }
1929 // Return whether the input sections attached to this output section
1930 // require sorting. This is used to handle constructor priorities
1931 // compatibly with GNU ld.
1933 must_sort_attached_input_sections() const
1934 { return this->must_sort_attached_input_sections_
; }
1936 // Record that the input sections attached to this output section
1939 set_must_sort_attached_input_sections()
1940 { this->must_sort_attached_input_sections_
= true; }
1942 // Return whether this section should be written after all the input
1943 // sections are complete.
1945 after_input_sections() const
1946 { return this->after_input_sections_
; }
1948 // Record that this section should be written after all the input
1949 // sections are complete.
1951 set_after_input_sections()
1952 { this->after_input_sections_
= true; }
1954 // Return whether this section requires postprocessing after all
1955 // relocations have been applied.
1957 requires_postprocessing() const
1958 { return this->requires_postprocessing_
; }
1960 // If a section requires postprocessing, return the buffer to use.
1962 postprocessing_buffer() const
1964 gold_assert(this->postprocessing_buffer_
!= NULL
);
1965 return this->postprocessing_buffer_
;
1968 // If a section requires postprocessing, create the buffer to use.
1970 create_postprocessing_buffer();
1972 // If a section requires postprocessing, this is the size of the
1973 // buffer to which relocations should be applied.
1975 postprocessing_buffer_size() const
1976 { return this->current_data_size_for_child(); }
1978 // Modify the section name. This is only permitted for an
1979 // unallocated section, and only before the size has been finalized.
1980 // Otherwise the name will not get into Layout::namepool_.
1982 set_name(const char* newname
)
1984 gold_assert((this->flags_
& elfcpp::SHF_ALLOC
) == 0);
1985 gold_assert(!this->is_data_size_valid());
1986 this->name_
= newname
;
1989 // Return whether the offset OFFSET in the input section SHNDX in
1990 // object OBJECT is being included in the link.
1992 is_input_address_mapped(const Relobj
* object
, unsigned int shndx
,
1993 off_t offset
) const;
1995 // Return the offset within the output section of OFFSET relative to
1996 // the start of input section SHNDX in object OBJECT.
1998 output_offset(const Relobj
* object
, unsigned int shndx
,
1999 section_offset_type offset
) const;
2001 // Return the output virtual address of OFFSET relative to the start
2002 // of input section SHNDX in object OBJECT.
2004 output_address(const Relobj
* object
, unsigned int shndx
,
2005 off_t offset
) const;
2007 // Return the output address of the start of the merged section for
2008 // input section SHNDX in object OBJECT. This is not necessarily
2009 // the offset corresponding to input offset 0 in the section, since
2010 // the section may be mapped arbitrarily.
2012 starting_output_address(const Relobj
* object
, unsigned int shndx
) const;
2014 // Record that this output section was found in the SECTIONS clause
2015 // of a linker script.
2017 set_found_in_sections_clause()
2018 { this->found_in_sections_clause_
= true; }
2020 // Return whether this output section was found in the SECTIONS
2021 // clause of a linker script.
2023 found_in_sections_clause() const
2024 { return this->found_in_sections_clause_
; }
2026 // Write the section header into *OPHDR.
2027 template<int size
, bool big_endian
>
2029 write_header(const Layout
*, const Stringpool
*,
2030 elfcpp::Shdr_write
<size
, big_endian
>*) const;
2032 // The next few calls are for linker script support.
2034 // Store the list of input sections for this Output_section into the
2035 // list passed in. This removes the input sections, leaving only
2036 // any Output_section_data elements. This returns the size of those
2037 // Output_section_data elements. ADDRESS is the address of this
2038 // output section. FILL is the fill value to use, in case there are
2039 // any spaces between the remaining Output_section_data elements.
2041 get_input_sections(uint64_t address
, const std::string
& fill
,
2042 std::list
<std::pair
<Relobj
*, unsigned int > >*);
2044 // Add an input section from a script.
2046 add_input_section_for_script(Relobj
* object
, unsigned int shndx
,
2047 off_t data_size
, uint64_t addralign
);
2049 // Set the current size of the output section.
2051 set_current_data_size(off_t size
)
2052 { this->set_current_data_size_for_child(size
); }
2054 // Get the current size of the output section.
2056 current_data_size() const
2057 { return this->current_data_size_for_child(); }
2059 // End of linker script support.
2061 // Print merge statistics to stderr.
2063 print_merge_stats();
2066 // Return the output section--i.e., the object itself.
2071 // Return the section index in the output file.
2073 do_out_shndx() const
2075 gold_assert(this->out_shndx_
!= -1U);
2076 return this->out_shndx_
;
2079 // Set the output section index.
2081 do_set_out_shndx(unsigned int shndx
)
2083 gold_assert(this->out_shndx_
== -1U || this->out_shndx_
== shndx
);
2084 this->out_shndx_
= shndx
;
2087 // Set the final data size of the Output_section. For a typical
2088 // Output_section, there is nothing to do, but if there are any
2089 // Output_section_data objects we need to set their final addresses
2092 set_final_data_size();
2094 // Reset the address and file offset.
2096 do_reset_address_and_file_offset();
2098 // Write the data to the file. For a typical Output_section, this
2099 // does nothing: the data is written out by calling Object::Relocate
2100 // on each input object. But if there are any Output_section_data
2101 // objects we do need to write them out here.
2103 do_write(Output_file
*);
2105 // Return the address alignment--function required by parent class.
2107 do_addralign() const
2108 { return this->addralign_
; }
2110 // Return whether there is a load address.
2112 do_has_load_address() const
2113 { return this->has_load_address_
; }
2115 // Return the load address.
2117 do_load_address() const
2119 gold_assert(this->has_load_address_
);
2120 return this->load_address_
;
2123 // Return whether this is an Output_section.
2125 do_is_section() const
2128 // Return whether this is a section of the specified type.
2130 do_is_section_type(elfcpp::Elf_Word type
) const
2131 { return this->type_
== type
; }
2133 // Return whether the specified section flag is set.
2135 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
2136 { return (this->flags_
& flag
) != 0; }
2138 // Set the TLS offset. Called only for SHT_TLS sections.
2140 do_set_tls_offset(uint64_t tls_base
);
2142 // Return the TLS offset, relative to the base of the TLS segment.
2143 // Valid only for SHT_TLS sections.
2145 do_tls_offset() const
2146 { return this->tls_offset_
; }
2148 // This may be implemented by a child class.
2150 do_finalize_name(Layout
*)
2153 // Record that this section requires postprocessing after all
2154 // relocations have been applied. This is called by a child class.
2156 set_requires_postprocessing()
2158 this->requires_postprocessing_
= true;
2159 this->after_input_sections_
= true;
2162 // Write all the data of an Output_section into the postprocessing
2165 write_to_postprocessing_buffer();
2168 // In some cases we need to keep a list of the input sections
2169 // associated with this output section. We only need the list if we
2170 // might have to change the offsets of the input section within the
2171 // output section after we add the input section. The ordinary
2172 // input sections will be written out when we process the object
2173 // file, and as such we don't need to track them here. We do need
2174 // to track Output_section_data objects here. We store instances of
2175 // this structure in a std::vector, so it must be a POD. There can
2176 // be many instances of this structure, so we use a union to save
2182 : shndx_(0), p2align_(0)
2184 this->u1_
.data_size
= 0;
2185 this->u2_
.object
= NULL
;
2188 // For an ordinary input section.
2189 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
2192 p2align_(ffsll(static_cast<long long>(addralign
)))
2194 gold_assert(shndx
!= OUTPUT_SECTION_CODE
2195 && shndx
!= MERGE_DATA_SECTION_CODE
2196 && shndx
!= MERGE_STRING_SECTION_CODE
);
2197 this->u1_
.data_size
= data_size
;
2198 this->u2_
.object
= object
;
2201 // For a non-merge output section.
2202 Input_section(Output_section_data
* posd
)
2203 : shndx_(OUTPUT_SECTION_CODE
),
2204 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
2206 this->u1_
.data_size
= 0;
2207 this->u2_
.posd
= posd
;
2210 // For a merge section.
2211 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
2213 ? MERGE_STRING_SECTION_CODE
2214 : MERGE_DATA_SECTION_CODE
),
2215 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
2217 this->u1_
.entsize
= entsize
;
2218 this->u2_
.posd
= posd
;
2221 // The required alignment.
2225 return (this->p2align_
== 0
2227 : static_cast<uint64_t>(1) << (this->p2align_
- 1));
2230 // Return the required size.
2234 // Whether this is an input section.
2236 is_input_section() const
2238 return (this->shndx_
!= OUTPUT_SECTION_CODE
2239 && this->shndx_
!= MERGE_DATA_SECTION_CODE
2240 && this->shndx_
!= MERGE_STRING_SECTION_CODE
);
2243 // Return whether this is a merge section which matches the
2246 is_merge_section(bool is_string
, uint64_t entsize
,
2247 uint64_t addralign
) const
2249 return (this->shndx_
== (is_string
2250 ? MERGE_STRING_SECTION_CODE
2251 : MERGE_DATA_SECTION_CODE
)
2252 && this->u1_
.entsize
== entsize
2253 && this->addralign() == addralign
);
2256 // Return the object for an input section.
2260 gold_assert(this->is_input_section());
2261 return this->u2_
.object
;
2264 // Return the input section index for an input section.
2268 gold_assert(this->is_input_section());
2269 return this->shndx_
;
2272 // Set the output section.
2274 set_output_section(Output_section
* os
)
2276 gold_assert(!this->is_input_section());
2277 this->u2_
.posd
->set_output_section(os
);
2280 // Set the address and file offset. This is called during
2281 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
2282 // the enclosing section.
2284 set_address_and_file_offset(uint64_t address
, off_t file_offset
,
2285 off_t section_file_offset
);
2287 // Reset the address and file offset.
2289 reset_address_and_file_offset();
2291 // Finalize the data size.
2293 finalize_data_size();
2295 // Add an input section, for SHF_MERGE sections.
2297 add_input_section(Relobj
* object
, unsigned int shndx
)
2299 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
2300 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
2301 return this->u2_
.posd
->add_input_section(object
, shndx
);
2304 // Given an input OBJECT, an input section index SHNDX within that
2305 // object, and an OFFSET relative to the start of that input
2306 // section, return whether or not the output offset is known. If
2307 // this function returns true, it sets *POUTPUT to the offset in
2308 // the output section, relative to the start of the input section
2309 // in the output section. *POUTPUT may be different from OFFSET
2310 // for a merged section.
2312 output_offset(const Relobj
* object
, unsigned int shndx
,
2313 section_offset_type offset
,
2314 section_offset_type
*poutput
) const;
2316 // Return whether this is the merge section for the input section
2319 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const;
2321 // Write out the data. This does nothing for an input section.
2323 write(Output_file
*);
2325 // Write the data to a buffer. This does nothing for an input
2328 write_to_buffer(unsigned char*);
2330 // Print statistics about merge sections to stderr.
2332 print_merge_stats(const char* section_name
)
2334 if (this->shndx_
== MERGE_DATA_SECTION_CODE
2335 || this->shndx_
== MERGE_STRING_SECTION_CODE
)
2336 this->u2_
.posd
->print_merge_stats(section_name
);
2340 // Code values which appear in shndx_. If the value is not one of
2341 // these codes, it is the input section index in the object file.
2344 // An Output_section_data.
2345 OUTPUT_SECTION_CODE
= -1U,
2346 // An Output_section_data for an SHF_MERGE section with
2347 // SHF_STRINGS not set.
2348 MERGE_DATA_SECTION_CODE
= -2U,
2349 // An Output_section_data for an SHF_MERGE section with
2351 MERGE_STRING_SECTION_CODE
= -3U
2354 // For an ordinary input section, this is the section index in the
2355 // input file. For an Output_section_data, this is
2356 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2357 // MERGE_STRING_SECTION_CODE.
2358 unsigned int shndx_
;
2359 // The required alignment, stored as a power of 2.
2360 unsigned int p2align_
;
2363 // For an ordinary input section, the section size.
2365 // For OUTPUT_SECTION_CODE, this is not used. For
2366 // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
2372 // For an ordinary input section, the object which holds the
2375 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2376 // MERGE_STRING_SECTION_CODE, the data.
2377 Output_section_data
* posd
;
2381 typedef std::vector
<Input_section
> Input_section_list
;
2383 // This class is used to sort the input sections.
2384 class Input_section_sort_entry
;
2386 // This is the sort comparison function.
2387 struct Input_section_sort_compare
2390 operator()(const Input_section_sort_entry
&,
2391 const Input_section_sort_entry
&) const;
2394 // Fill data. This is used to fill in data between input sections.
2395 // It is also used for data statements (BYTE, WORD, etc.) in linker
2396 // scripts. When we have to keep track of the input sections, we
2397 // can use an Output_data_const, but we don't want to have to keep
2398 // track of input sections just to implement fills.
2402 Fill(off_t section_offset
, off_t length
)
2403 : section_offset_(section_offset
),
2404 length_(convert_to_section_size_type(length
))
2407 // Return section offset.
2409 section_offset() const
2410 { return this->section_offset_
; }
2412 // Return fill length.
2415 { return this->length_
; }
2418 // The offset within the output section.
2419 off_t section_offset_
;
2420 // The length of the space to fill.
2421 section_size_type length_
;
2424 typedef std::vector
<Fill
> Fill_list
;
2426 // Add a new output section by Input_section.
2428 add_output_section_data(Input_section
*);
2430 // Add an SHF_MERGE input section. Returns true if the section was
2433 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
2434 uint64_t entsize
, uint64_t addralign
);
2436 // Add an output SHF_MERGE section POSD to this output section.
2437 // IS_STRING indicates whether it is a SHF_STRINGS section, and
2438 // ENTSIZE is the entity size. This returns the entry added to
2441 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
2444 // Sort the attached input sections.
2446 sort_attached_input_sections();
2448 // Most of these fields are only valid after layout.
2450 // The name of the section. This will point into a Stringpool.
2452 // The section address is in the parent class.
2453 // The section alignment.
2454 uint64_t addralign_
;
2455 // The section entry size.
2457 // The load address. This is only used when using a linker script
2458 // with a SECTIONS clause. The has_load_address_ field indicates
2459 // whether this field is valid.
2460 uint64_t load_address_
;
2461 // The file offset is in the parent class.
2462 // Set the section link field to the index of this section.
2463 const Output_data
* link_section_
;
2464 // If link_section_ is NULL, this is the link field.
2466 // Set the section info field to the index of this section.
2467 const Output_section
* info_section_
;
2468 // If info_section_ is NULL, set the info field to the symbol table
2469 // index of this symbol.
2470 const Symbol
* info_symndx_
;
2471 // If info_section_ and info_symndx_ are NULL, this is the section
2474 // The section type.
2475 const elfcpp::Elf_Word type_
;
2476 // The section flags.
2477 elfcpp::Elf_Xword flags_
;
2478 // The section index.
2479 unsigned int out_shndx_
;
2480 // If there is a STT_SECTION for this output section in the normal
2481 // symbol table, this is the symbol index. This starts out as zero.
2482 // It is initialized in Layout::finalize() to be the index, or -1U
2483 // if there isn't one.
2484 unsigned int symtab_index_
;
2485 // If there is a STT_SECTION for this output section in the dynamic
2486 // symbol table, this is the symbol index. This starts out as zero.
2487 // It is initialized in Layout::finalize() to be the index, or -1U
2488 // if there isn't one.
2489 unsigned int dynsym_index_
;
2490 // The input sections. This will be empty in cases where we don't
2491 // need to keep track of them.
2492 Input_section_list input_sections_
;
2493 // The offset of the first entry in input_sections_.
2494 off_t first_input_offset_
;
2495 // The fill data. This is separate from input_sections_ because we
2496 // often will need fill sections without needing to keep track of
2499 // If the section requires postprocessing, this buffer holds the
2500 // section contents during relocation.
2501 unsigned char* postprocessing_buffer_
;
2502 // Whether this output section needs a STT_SECTION symbol in the
2503 // normal symbol table. This will be true if there is a relocation
2505 bool needs_symtab_index_
: 1;
2506 // Whether this output section needs a STT_SECTION symbol in the
2507 // dynamic symbol table. This will be true if there is a dynamic
2508 // relocation which needs it.
2509 bool needs_dynsym_index_
: 1;
2510 // Whether the link field of this output section should point to the
2511 // normal symbol table.
2512 bool should_link_to_symtab_
: 1;
2513 // Whether the link field of this output section should point to the
2514 // dynamic symbol table.
2515 bool should_link_to_dynsym_
: 1;
2516 // Whether this section should be written after all the input
2517 // sections are complete.
2518 bool after_input_sections_
: 1;
2519 // Whether this section requires post processing after all
2520 // relocations have been applied.
2521 bool requires_postprocessing_
: 1;
2522 // Whether an input section was mapped to this output section
2523 // because of a SECTIONS clause in a linker script.
2524 bool found_in_sections_clause_
: 1;
2525 // Whether this section has an explicitly specified load address.
2526 bool has_load_address_
: 1;
2527 // True if the info_section_ field means the section index of the
2528 // section, false if it means the symbol index of the corresponding
2530 bool info_uses_section_index_
: 1;
2531 // True if the input sections attached to this output section may
2533 bool may_sort_attached_input_sections_
: 1;
2534 // True if the input sections attached to this output section must
2536 bool must_sort_attached_input_sections_
: 1;
2537 // True if the input sections attached to this output section have
2538 // already been sorted.
2539 bool attached_input_sections_are_sorted_
: 1;
2540 // For SHT_TLS sections, the offset of this section relative to the base
2541 // of the TLS segment.
2542 uint64_t tls_offset_
;
2545 // An output segment. PT_LOAD segments are built from collections of
2546 // output sections. Other segments typically point within PT_LOAD
2547 // segments, and are built directly as needed.
2549 class Output_segment
2552 // Create an output segment, specifying the type and flags.
2553 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
2555 // Return the virtual address.
2558 { return this->vaddr_
; }
2560 // Return the physical address.
2563 { return this->paddr_
; }
2565 // Return the segment type.
2568 { return this->type_
; }
2570 // Return the segment flags.
2573 { return this->flags_
; }
2575 // Return the memory size.
2578 { return this->memsz_
; }
2580 // Return the file size.
2583 { return this->filesz_
; }
2585 // Return the file offset.
2588 { return this->offset_
; }
2590 // Return the maximum alignment of the Output_data.
2592 maximum_alignment();
2594 // Add an Output_section to this segment.
2596 add_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
2597 { this->add_output_section(os
, seg_flags
, false); }
2599 // Add an Output_section to the start of this segment.
2601 add_initial_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
2602 { this->add_output_section(os
, seg_flags
, true); }
2604 // Remove an Output_section from this segment. It is an error if it
2607 remove_output_section(Output_section
* os
);
2609 // Add an Output_data (which is not an Output_section) to the start
2612 add_initial_output_data(Output_data
*);
2614 // Return true if this segment has any sections which hold actual
2615 // data, rather than being a BSS section.
2617 has_any_data_sections() const
2618 { return !this->output_data_
.empty(); }
2620 // Return the number of dynamic relocations applied to this segment.
2622 dynamic_reloc_count() const;
2624 // Return the address of the first section.
2626 first_section_load_address() const;
2628 // Return whether the addresses have been set already.
2630 are_addresses_set() const
2631 { return this->are_addresses_set_
; }
2633 // Set the addresses.
2635 set_addresses(uint64_t vaddr
, uint64_t paddr
)
2637 this->vaddr_
= vaddr
;
2638 this->paddr_
= paddr
;
2639 this->are_addresses_set_
= true;
2642 // Set the segment flags. This is only used if we have a PHDRS
2643 // clause which explicitly specifies the flags.
2645 set_flags(elfcpp::Elf_Word flags
)
2646 { this->flags_
= flags
; }
2648 // Set the address of the segment to ADDR and the offset to *POFF
2649 // and set the addresses and offsets of all contained output
2650 // sections accordingly. Set the section indexes of all contained
2651 // output sections starting with *PSHNDX. If RESET is true, first
2652 // reset the addresses of the contained sections. Return the
2653 // address of the immediately following segment. Update *POFF and
2654 // *PSHNDX. This should only be called for a PT_LOAD segment.
2656 set_section_addresses(const Layout
*, bool reset
, uint64_t addr
, off_t
* poff
,
2657 unsigned int* pshndx
);
2659 // Set the minimum alignment of this segment. This may be adjusted
2660 // upward based on the section alignments.
2662 set_minimum_p_align(uint64_t align
)
2663 { this->min_p_align_
= align
; }
2665 // Set the offset of this segment based on the section. This should
2666 // only be called for a non-PT_LOAD segment.
2670 // Set the TLS offsets of the sections contained in the PT_TLS segment.
2674 // Return the number of output sections.
2676 output_section_count() const;
2678 // Return the section attached to the list segment with the lowest
2679 // load address. This is used when handling a PHDRS clause in a
2682 section_with_lowest_load_address() const;
2684 // Write the segment header into *OPHDR.
2685 template<int size
, bool big_endian
>
2687 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
2689 // Write the section headers of associated sections into V.
2690 template<int size
, bool big_endian
>
2692 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
2693 unsigned int* pshndx
) const;
2696 Output_segment(const Output_segment
&);
2697 Output_segment
& operator=(const Output_segment
&);
2699 typedef std::list
<Output_data
*> Output_data_list
;
2701 // Add an Output_section to this segment, specifying front or back.
2703 add_output_section(Output_section
*, elfcpp::Elf_Word seg_flags
,
2706 // Find the maximum alignment in an Output_data_list.
2708 maximum_alignment_list(const Output_data_list
*);
2710 // Set the section addresses in an Output_data_list.
2712 set_section_list_addresses(const Layout
*, bool reset
, Output_data_list
*,
2713 uint64_t addr
, off_t
* poff
, unsigned int* pshndx
,
2716 // Return the number of Output_sections in an Output_data_list.
2718 output_section_count_list(const Output_data_list
*) const;
2720 // Return the number of dynamic relocs in an Output_data_list.
2722 dynamic_reloc_count_list(const Output_data_list
*) const;
2724 // Find the section with the lowest load address in an
2725 // Output_data_list.
2727 lowest_load_address_in_list(const Output_data_list
* pdl
,
2728 Output_section
** found
,
2729 uint64_t* found_lma
) const;
2731 // Write the section headers in the list into V.
2732 template<int size
, bool big_endian
>
2734 write_section_headers_list(const Layout
*, const Stringpool
*,
2735 const Output_data_list
*, unsigned char* v
,
2736 unsigned int* pshdx
) const;
2738 // The list of output data with contents attached to this segment.
2739 Output_data_list output_data_
;
2740 // The list of output data without contents attached to this segment.
2741 Output_data_list output_bss_
;
2742 // The segment virtual address.
2744 // The segment physical address.
2746 // The size of the segment in memory.
2748 // The maximum section alignment. The is_max_align_known_ field
2749 // indicates whether this has been finalized.
2750 uint64_t max_align_
;
2751 // The required minimum value for the p_align field. This is used
2752 // for PT_LOAD segments. Note that this does not mean that
2753 // addresses should be aligned to this value; it means the p_paddr
2754 // and p_vaddr fields must be congruent modulo this value. For
2755 // non-PT_LOAD segments, the dynamic linker works more efficiently
2756 // if the p_align field has the more conventional value, although it
2757 // can align as needed.
2758 uint64_t min_p_align_
;
2759 // The offset of the segment data within the file.
2761 // The size of the segment data in the file.
2763 // The segment type;
2764 elfcpp::Elf_Word type_
;
2765 // The segment flags.
2766 elfcpp::Elf_Word flags_
;
2767 // Whether we have finalized max_align_.
2768 bool is_max_align_known_
: 1;
2769 // Whether vaddr and paddr were set by a linker script.
2770 bool are_addresses_set_
: 1;
2773 // This class represents the output file.
2778 Output_file(const char* name
);
2780 // Indicate that this is a temporary file which should not be
2784 { this->is_temporary_
= true; }
2786 // Open the output file. FILE_SIZE is the final size of the file.
2788 open(off_t file_size
);
2790 // Resize the output file.
2792 resize(off_t file_size
);
2794 // Close the output file (flushing all buffered data) and make sure
2795 // there are no errors.
2799 // We currently always use mmap which makes the view handling quite
2800 // simple. In the future we may support other approaches.
2802 // Write data to the output file.
2804 write(off_t offset
, const void* data
, size_t len
)
2805 { memcpy(this->base_
+ offset
, data
, len
); }
2807 // Get a buffer to use to write to the file, given the offset into
2808 // the file and the size.
2810 get_output_view(off_t start
, size_t size
)
2812 gold_assert(start
>= 0
2813 && start
+ static_cast<off_t
>(size
) <= this->file_size_
);
2814 return this->base_
+ start
;
2817 // VIEW must have been returned by get_output_view. Write the
2818 // buffer to the file, passing in the offset and the size.
2820 write_output_view(off_t
, size_t, unsigned char*)
2823 // Get a read/write buffer. This is used when we want to write part
2824 // of the file, read it in, and write it again.
2826 get_input_output_view(off_t start
, size_t size
)
2827 { return this->get_output_view(start
, size
); }
2829 // Write a read/write buffer back to the file.
2831 write_input_output_view(off_t
, size_t, unsigned char*)
2834 // Get a read buffer. This is used when we just want to read part
2835 // of the file back it in.
2836 const unsigned char*
2837 get_input_view(off_t start
, size_t size
)
2838 { return this->get_output_view(start
, size
); }
2840 // Release a read bfufer.
2842 free_input_view(off_t
, size_t, const unsigned char*)
2846 // Map the file into memory and return a pointer to the map.
2850 // Unmap the file from memory (and flush to disk buffers).
2860 // Base of file mapped into memory.
2861 unsigned char* base_
;
2862 // True iff base_ points to a memory buffer rather than an output file.
2863 bool map_is_anonymous_
;
2864 // True if this is a temporary file which should not be output.
2868 } // End namespace gold.
2870 #endif // !defined(GOLD_OUTPUT_H)