1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007 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
;
42 template<int size
, bool big_endian
>
44 template<int size
, bool big_endian
>
47 // An abtract class for data which has to go into the output file.
52 explicit Output_data()
53 : address_(0), data_size_(0), offset_(-1),
54 is_address_valid_(false), is_data_size_valid_(false),
55 is_offset_valid_(false),
56 dynamic_reloc_count_(0)
62 // Return the address. For allocated sections, this is only valid
63 // after Layout::finalize is finished.
67 gold_assert(this->is_address_valid_
);
68 return this->address_
;
71 // Return the size of the data. For allocated sections, this must
72 // be valid after Layout::finalize calls set_address, but need not
73 // be valid before then.
77 gold_assert(this->is_data_size_valid_
);
78 return this->data_size_
;
81 // Return the file offset. This is only valid after
82 // Layout::finalize is finished. For some non-allocated sections,
83 // it may not be valid until near the end of the link.
87 gold_assert(this->is_offset_valid_
);
91 // Return the required alignment.
94 { return this->do_addralign(); }
96 // Return whether this is an Output_section.
99 { return this->do_is_section(); }
101 // Return whether this is an Output_section of the specified type.
103 is_section_type(elfcpp::Elf_Word stt
) const
104 { return this->do_is_section_type(stt
); }
106 // Return whether this is an Output_section with the specified flag
109 is_section_flag_set(elfcpp::Elf_Xword shf
) const
110 { return this->do_is_section_flag_set(shf
); }
112 // Return the output section index, if there is an output section.
115 { return this->do_out_shndx(); }
117 // Set the output section index, if this is an output section.
119 set_out_shndx(unsigned int shndx
)
120 { this->do_set_out_shndx(shndx
); }
122 // Set the address and file offset of this data, and finalize the
123 // size of the data. This is called during Layout::finalize for
124 // allocated sections.
126 set_address_and_file_offset(uint64_t addr
, off_t off
)
128 this->set_address(addr
);
129 this->set_file_offset(off
);
130 this->finalize_data_size();
135 set_address(uint64_t addr
)
137 gold_assert(!this->is_address_valid_
);
138 this->address_
= addr
;
139 this->is_address_valid_
= true;
142 // Set the file offset.
144 set_file_offset(off_t off
)
146 gold_assert(!this->is_offset_valid_
);
148 this->is_offset_valid_
= true;
151 // Finalize the data size.
155 if (!this->is_data_size_valid_
)
157 // Tell the child class to set the data size.
158 this->set_final_data_size();
159 gold_assert(this->is_data_size_valid_
);
163 // Write the data to the output file. This is called after
164 // Layout::finalize is complete.
166 write(Output_file
* file
)
167 { this->do_write(file
); }
169 // This is called by Layout::finalize to note that the sizes of
170 // allocated sections must now be fixed.
173 { Output_data::allocated_sizes_are_fixed
= true; }
175 // Used to check that layout has been done.
178 { return Output_data::allocated_sizes_are_fixed
; }
180 // Count the number of dynamic relocations applied to this section.
183 { ++this->dynamic_reloc_count_
; }
185 // Return the number of dynamic relocations applied to this section.
187 dynamic_reloc_count() const
188 { return this->dynamic_reloc_count_
; }
191 // Functions that child classes may or in some cases must implement.
193 // Write the data to the output file.
195 do_write(Output_file
*) = 0;
197 // Return the required alignment.
199 do_addralign() const = 0;
201 // Return whether this is an Output_section.
203 do_is_section() const
206 // Return whether this is an Output_section of the specified type.
207 // This only needs to be implement by Output_section.
209 do_is_section_type(elfcpp::Elf_Word
) const
212 // Return whether this is an Output_section with the specific flag
213 // set. This only needs to be implemented by Output_section.
215 do_is_section_flag_set(elfcpp::Elf_Xword
) const
218 // Return the output section index, if there is an output section.
221 { gold_unreachable(); }
223 // Set the output section index, if this is an output section.
225 do_set_out_shndx(unsigned int)
226 { gold_unreachable(); }
228 // This is a hook for derived classes to set the data size. This is
229 // called by finalize_data_size, normally called during
230 // Layout::finalize, when the section address is set.
232 set_final_data_size()
233 { gold_unreachable(); }
235 // Functions that child classes may call.
237 // Whether the address is valid.
239 is_address_valid() const
240 { return this->is_address_valid_
; }
242 // Whether the file offset is valid.
244 is_offset_valid() const
245 { return this->is_offset_valid_
; }
247 // Whether the data size is valid.
249 is_data_size_valid() const
250 { return this->is_data_size_valid_
; }
252 // Set the size of the data.
254 set_data_size(off_t data_size
)
256 gold_assert(!this->is_data_size_valid_
);
257 this->data_size_
= data_size
;
258 this->is_data_size_valid_
= true;
261 // Get the current data size--this is for the convenience of
262 // sections which build up their size over time.
264 current_data_size_for_child() const
265 { return this->data_size_
; }
267 // Set the current data size--this is for the convenience of
268 // sections which build up their size over time.
270 set_current_data_size_for_child(off_t data_size
)
272 gold_assert(!this->is_data_size_valid_
);
273 this->data_size_
= data_size
;
276 // Return default alignment for the target size.
280 // Return default alignment for a specified size--32 or 64.
282 default_alignment_for_size(int size
);
285 Output_data(const Output_data
&);
286 Output_data
& operator=(const Output_data
&);
288 // This is used for verification, to make sure that we don't try to
289 // change any sizes of allocated sections after we set the section
291 static bool allocated_sizes_are_fixed
;
293 // Memory address in output file.
295 // Size of data in output file.
297 // File offset of contents in output file.
299 // Whether address_ is valid.
300 bool is_address_valid_
;
301 // Whether data_size_ is valid.
302 bool is_data_size_valid_
;
303 // Whether offset_ is valid.
304 bool is_offset_valid_
;
305 // Count of dynamic relocations applied to this section.
306 unsigned int dynamic_reloc_count_
;
309 // Output the section headers.
311 class Output_section_headers
: public Output_data
314 Output_section_headers(const Layout
*,
315 const Layout::Segment_list
*,
316 const Layout::Section_list
*,
320 // Write the data to the file.
322 do_write(Output_file
*);
324 // Return the required alignment.
327 { return Output_data::default_alignment(); }
330 // Write the data to the file with the right size and endianness.
331 template<int size
, bool big_endian
>
333 do_sized_write(Output_file
*);
335 const Layout
* layout_
;
336 const Layout::Segment_list
* segment_list_
;
337 const Layout::Section_list
* unattached_section_list_
;
338 const Stringpool
* secnamepool_
;
341 // Output the segment headers.
343 class Output_segment_headers
: public Output_data
346 Output_segment_headers(const Layout::Segment_list
& segment_list
);
349 // Write the data to the file.
351 do_write(Output_file
*);
353 // Return the required alignment.
356 { return Output_data::default_alignment(); }
359 // Write the data to the file with the right size and endianness.
360 template<int size
, bool big_endian
>
362 do_sized_write(Output_file
*);
364 const Layout::Segment_list
& segment_list_
;
367 // Output the ELF file header.
369 class Output_file_header
: public Output_data
372 Output_file_header(const Target
*,
374 const Output_segment_headers
*);
376 // Add information about the section headers. We lay out the ELF
377 // file header before we create the section headers.
378 void set_section_info(const Output_section_headers
*,
379 const Output_section
* shstrtab
);
382 // Write the data to the file.
384 do_write(Output_file
*);
386 // Return the required alignment.
389 { return Output_data::default_alignment(); }
392 // Write the data to the file with the right size and endianness.
393 template<int size
, bool big_endian
>
395 do_sized_write(Output_file
*);
397 const Target
* target_
;
398 const Symbol_table
* symtab_
;
399 const Output_segment_headers
* segment_header_
;
400 const Output_section_headers
* section_header_
;
401 const Output_section
* shstrtab_
;
404 // Output sections are mainly comprised of input sections. However,
405 // there are cases where we have data to write out which is not in an
406 // input section. Output_section_data is used in such cases. This is
407 // an abstract base class.
409 class Output_section_data
: public Output_data
412 Output_section_data(off_t data_size
, uint64_t addralign
)
413 : Output_data(), output_section_(NULL
), addralign_(addralign
)
414 { this->set_data_size(data_size
); }
416 Output_section_data(uint64_t addralign
)
417 : Output_data(), output_section_(NULL
), addralign_(addralign
)
420 // Return the output section.
421 const Output_section
*
422 output_section() const
423 { return this->output_section_
; }
425 // Record the output section.
427 set_output_section(Output_section
* os
);
429 // Add an input section, for SHF_MERGE sections. This returns true
430 // if the section was handled.
432 add_input_section(Relobj
* object
, unsigned int shndx
)
433 { return this->do_add_input_section(object
, shndx
); }
435 // Given an input OBJECT, an input section index SHNDX within that
436 // object, and an OFFSET relative to the start of that input
437 // section, return whether or not the corresponding offset within
438 // the output section is known. If this function returns true, it
439 // sets *POUTPUT to the output offset. The value -1 indicates that
440 // this input offset is being discarded.
442 output_offset(const Relobj
* object
, unsigned int shndx
, off_t offset
,
443 off_t
*poutput
) const
444 { return this->do_output_offset(object
, shndx
, offset
, poutput
); }
447 // The child class must implement do_write.
449 // The child class may implement specific adjustments to the output
452 do_adjust_output_section(Output_section
*)
455 // May be implemented by child class. Return true if the section
458 do_add_input_section(Relobj
*, unsigned int)
459 { gold_unreachable(); }
461 // The child class may implement output_offset.
463 do_output_offset(const Relobj
*, unsigned int, off_t
, off_t
*) const
466 // Return the required alignment.
469 { return this->addralign_
; }
471 // Return the section index of the output section.
473 do_out_shndx() const;
475 // Set the alignment.
477 set_addralign(uint64_t addralign
)
478 { this->addralign_
= addralign
; }
481 // The output section for this section.
482 const Output_section
* output_section_
;
483 // The required alignment.
487 // Some Output_section_data classes build up their data step by step,
488 // rather than all at once. This class provides an interface for
491 class Output_section_data_build
: public Output_section_data
494 Output_section_data_build(uint64_t addralign
)
495 : Output_section_data(addralign
)
498 // Get the current data size.
500 current_data_size() const
501 { return this->current_data_size_for_child(); }
503 // Set the current data size.
505 set_current_data_size(off_t data_size
)
506 { this->set_current_data_size_for_child(data_size
); }
509 // Set the final data size.
511 set_final_data_size()
512 { this->set_data_size(this->current_data_size_for_child()); }
515 // A simple case of Output_data in which we have constant data to
518 class Output_data_const
: public Output_section_data
521 Output_data_const(const std::string
& data
, uint64_t addralign
)
522 : Output_section_data(data
.size(), addralign
), data_(data
)
525 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
526 : Output_section_data(len
, addralign
), data_(p
, len
)
529 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
530 : Output_section_data(len
, addralign
),
531 data_(reinterpret_cast<const char*>(p
), len
)
535 // Write the data to the output file.
537 do_write(Output_file
*);
543 // Another version of Output_data with constant data, in which the
544 // buffer is allocated by the caller.
546 class Output_data_const_buffer
: public Output_section_data
549 Output_data_const_buffer(const unsigned char* p
, off_t len
,
551 : Output_section_data(len
, addralign
), p_(p
)
555 // Write the data the output file.
557 do_write(Output_file
*);
560 const unsigned char* p_
;
563 // A place holder for a fixed amount of data written out via some
566 class Output_data_fixed_space
: public Output_section_data
569 Output_data_fixed_space(off_t data_size
, uint64_t addralign
)
570 : Output_section_data(data_size
, addralign
)
574 // Write out the data--the actual data must be written out
577 do_write(Output_file
*)
581 // A place holder for variable sized data written out via some other
584 class Output_data_space
: public Output_section_data_build
587 explicit Output_data_space(uint64_t addralign
)
588 : Output_section_data_build(addralign
)
591 // Set the alignment.
593 set_space_alignment(uint64_t align
)
594 { this->set_addralign(align
); }
597 // Write out the data--the actual data must be written out
600 do_write(Output_file
*)
604 // A string table which goes into an output section.
606 class Output_data_strtab
: public Output_section_data
609 Output_data_strtab(Stringpool
* strtab
)
610 : Output_section_data(1), strtab_(strtab
)
614 // This is called to set the address and file offset. Here we make
615 // sure that the Stringpool is finalized.
617 set_final_data_size();
619 // Write out the data.
621 do_write(Output_file
*);
627 // This POD class is used to represent a single reloc in the output
628 // file. This could be a private class within Output_data_reloc, but
629 // the templatization is complex enough that I broke it out into a
630 // separate class. The class is templatized on either elfcpp::SHT_REL
631 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
632 // relocation or an ordinary relocation.
634 // A relocation can be against a global symbol, a local symbol, an
635 // output section, or the undefined symbol at index 0. We represent
636 // the latter by using a NULL global symbol.
638 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
641 template<bool dynamic
, int size
, bool big_endian
>
642 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
645 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
647 // An uninitialized entry. We need this because we want to put
648 // instances of this class into an STL container.
650 : local_sym_index_(INVALID_CODE
)
653 // A reloc against a global symbol.
655 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
657 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
660 this->u1_
.gsym
= gsym
;
664 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
665 unsigned int shndx
, Address address
)
666 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
669 gold_assert(shndx
!= INVALID_CODE
);
670 this->u1_
.gsym
= gsym
;
671 this->u2_
.relobj
= relobj
;
674 // A reloc against a local symbol.
676 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
677 unsigned int local_sym_index
,
681 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
684 gold_assert(local_sym_index
!= GSYM_CODE
685 && local_sym_index
!= INVALID_CODE
);
686 this->u1_
.relobj
= relobj
;
690 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
691 unsigned int local_sym_index
,
695 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
698 gold_assert(local_sym_index
!= GSYM_CODE
699 && local_sym_index
!= INVALID_CODE
);
700 gold_assert(shndx
!= INVALID_CODE
);
701 this->u1_
.relobj
= relobj
;
702 this->u2_
.relobj
= relobj
;
705 // A reloc against the STT_SECTION symbol of an output section.
707 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
709 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
716 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
717 unsigned int shndx
, Address address
)
718 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
721 gold_assert(shndx
!= INVALID_CODE
);
723 this->u2_
.relobj
= relobj
;
726 // Write the reloc entry to an output view.
728 write(unsigned char* pov
) const;
730 // Write the offset and info fields to Write_rel.
731 template<typename Write_rel
>
732 void write_rel(Write_rel
*) const;
735 // Return the symbol index. We can't do a double template
736 // specialization, so we do a secondary template here.
738 get_symbol_index() const;
740 // Codes for local_sym_index_.
747 // Invalid uninitialized entry.
753 // For a local symbol, the object. We will never generate a
754 // relocation against a local symbol in a dynamic object; that
755 // doesn't make sense. And our callers will always be
756 // templatized, so we use Sized_relobj here.
757 Sized_relobj
<size
, big_endian
>* relobj
;
758 // For a global symbol, the symbol. If this is NULL, it indicates
759 // a relocation against the undefined 0 symbol.
761 // For a relocation against an output section, the output section.
766 // If shndx_ is not INVALID CODE, the object which holds the input
767 // section being used to specify the reloc address.
769 // If shndx_ is INVALID_CODE, the output data being used to
770 // specify the reloc address. This may be NULL if the reloc
771 // address is absolute.
774 // The address offset within the input section or the Output_data.
776 // For a local symbol, the local symbol index. This is GSYM_CODE
777 // for a global symbol, or INVALID_CODE for an uninitialized value.
778 unsigned int local_sym_index_
;
779 // The reloc type--a processor specific code.
781 // If the reloc address is an input section in an object, the
782 // section index. This is INVALID_CODE if the reloc address is
783 // specified in some other way.
787 // The SHT_RELA version of Output_reloc<>. This is just derived from
788 // the SHT_REL version of Output_reloc, but it adds an addend.
790 template<bool dynamic
, int size
, bool big_endian
>
791 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
794 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
795 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
797 // An uninitialized entry.
802 // A reloc against a global symbol.
804 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
805 Address address
, Addend addend
)
806 : rel_(gsym
, type
, od
, address
), addend_(addend
)
809 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
810 unsigned int shndx
, Address address
, Addend addend
)
811 : rel_(gsym
, type
, relobj
, shndx
, address
), addend_(addend
)
814 // A reloc against a local symbol.
816 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
817 unsigned int local_sym_index
,
818 unsigned int type
, Output_data
* od
, Address address
,
820 : rel_(relobj
, local_sym_index
, type
, od
, address
), addend_(addend
)
823 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
824 unsigned int local_sym_index
,
829 : rel_(relobj
, local_sym_index
, type
, shndx
, address
),
833 // A reloc against the STT_SECTION symbol of an output section.
835 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
836 Address address
, Addend addend
)
837 : rel_(os
, type
, od
, address
), addend_(addend
)
840 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
841 unsigned int shndx
, Address address
, Addend addend
)
842 : rel_(os
, type
, relobj
, shndx
, address
), addend_(addend
)
845 // Write the reloc entry to an output view.
847 write(unsigned char* pov
) const;
851 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
856 // Output_data_reloc is used to manage a section containing relocs.
857 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
858 // indicates whether this is a dynamic relocation or a normal
859 // relocation. Output_data_reloc_base is a base class.
860 // Output_data_reloc is the real class, which we specialize based on
863 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
864 class Output_data_reloc_base
: public Output_section_data_build
867 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
868 typedef typename
Output_reloc_type::Address Address
;
869 static const int reloc_size
=
870 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
872 // Construct the section.
873 Output_data_reloc_base()
874 : Output_section_data_build(Output_data::default_alignment_for_size(size
))
878 // Write out the data.
880 do_write(Output_file
*);
882 // Set the entry size and the link.
884 do_adjust_output_section(Output_section
*os
);
886 // Add a relocation entry.
888 add(Output_data
*od
, const Output_reloc_type
& reloc
)
890 this->relocs_
.push_back(reloc
);
891 this->set_current_data_size(this->relocs_
.size() * reloc_size
);
892 od
->add_dynamic_reloc();
896 typedef std::vector
<Output_reloc_type
> Relocs
;
901 // The class which callers actually create.
903 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
904 class Output_data_reloc
;
906 // The SHT_REL version of Output_data_reloc.
908 template<bool dynamic
, int size
, bool big_endian
>
909 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
910 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
913 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
917 typedef typename
Base::Output_reloc_type Output_reloc_type
;
918 typedef typename
Output_reloc_type::Address Address
;
921 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>()
924 // Add a reloc against a global symbol.
927 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
928 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
)); }
931 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Relobj
* relobj
,
932 unsigned int shndx
, Address address
)
933 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
)); }
935 // Add a reloc against a local symbol.
938 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
939 unsigned int local_sym_index
, unsigned int type
,
940 Output_data
* od
, Address address
)
941 { this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
945 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
946 unsigned int local_sym_index
, unsigned int type
,
947 Output_data
* od
, unsigned int shndx
, Address address
)
948 { this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
952 // A reloc against the STT_SECTION symbol of an output section.
953 // OS is the Output_section that the relocation refers to; OD is
954 // the Output_data object being relocated.
957 add_output_section(Output_section
* os
, unsigned int type
,
958 Output_data
* od
, Address address
)
959 { this->add(od
, Output_reloc_type(os
, type
, od
, address
)); }
962 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
963 Relobj
* relobj
, unsigned int shndx
, Address address
)
964 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
)); }
967 // The SHT_RELA version of Output_data_reloc.
969 template<bool dynamic
, int size
, bool big_endian
>
970 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
971 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
974 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
978 typedef typename
Base::Output_reloc_type Output_reloc_type
;
979 typedef typename
Output_reloc_type::Address Address
;
980 typedef typename
Output_reloc_type::Addend Addend
;
983 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>()
986 // Add a reloc against a global symbol.
989 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
990 Address address
, Addend addend
)
991 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
)); }
994 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Relobj
* relobj
,
995 unsigned int shndx
, Address address
,
997 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1000 // Add a reloc against a local symbol.
1003 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1004 unsigned int local_sym_index
, unsigned int type
,
1005 Output_data
* od
, Address address
, Addend addend
)
1007 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1012 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1013 unsigned int local_sym_index
, unsigned int type
,
1014 Output_data
* od
, unsigned int shndx
, Address address
,
1017 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1021 // A reloc against the STT_SECTION symbol of an output section.
1024 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1025 Address address
, Addend addend
)
1026 { this->add(os
, Output_reloc_type(os
, type
, od
, address
, addend
)); }
1029 add_output_section(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
1030 unsigned int shndx
, Address address
, Addend addend
)
1031 { this->add(os
, Output_reloc_type(os
, type
, relobj
, shndx
, address
,
1035 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1036 // for one symbol--either a global symbol or a local symbol in an
1037 // object. The target specific code adds entries to the GOT as
1040 template<int size
, bool big_endian
>
1041 class Output_data_got
: public Output_section_data_build
1044 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
1047 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1051 // Add an entry for a global symbol to the GOT. Return true if this
1052 // is a new GOT entry, false if the symbol was already in the GOT.
1054 add_global(Symbol
* gsym
);
1056 // Add an entry for a local symbol to the GOT. This returns true if
1057 // this is a new GOT entry, false if the symbol already has a GOT
1060 add_local(Sized_relobj
<size
, big_endian
>* object
, unsigned int sym_index
);
1062 // Add an entry (or pair of entries) for a global TLS symbol to the GOT.
1063 // Return true if this is a new GOT entry, false if the symbol was
1064 // already in the GOT.
1066 add_global_tls(Symbol
* gsym
, bool need_pair
);
1068 // Add an entry (or pair of entries) for a local TLS symbol to the GOT.
1069 // This returns true if this is a new GOT entry, false if the symbol
1070 // already has a GOT entry.
1072 add_local_tls(Sized_relobj
<size
, big_endian
>* object
,
1073 unsigned int sym_index
, bool need_pair
);
1075 // Add a constant to the GOT. This returns the offset of the new
1076 // entry from the start of the GOT.
1078 add_constant(Valtype constant
)
1080 this->entries_
.push_back(Got_entry(constant
));
1081 this->set_got_size();
1082 return this->last_got_offset();
1086 // Write out the GOT table.
1088 do_write(Output_file
*);
1091 // This POD class holds a single GOT entry.
1095 // Create a zero entry.
1097 : local_sym_index_(CONSTANT_CODE
)
1098 { this->u_
.constant
= 0; }
1100 // Create a global symbol entry.
1101 explicit Got_entry(Symbol
* gsym
)
1102 : local_sym_index_(GSYM_CODE
)
1103 { this->u_
.gsym
= gsym
; }
1105 // Create a local symbol entry.
1106 Got_entry(Sized_relobj
<size
, big_endian
>* object
,
1107 unsigned int local_sym_index
)
1108 : local_sym_index_(local_sym_index
)
1110 gold_assert(local_sym_index
!= GSYM_CODE
1111 && local_sym_index
!= CONSTANT_CODE
);
1112 this->u_
.object
= object
;
1115 // Create a constant entry. The constant is a host value--it will
1116 // be swapped, if necessary, when it is written out.
1117 explicit Got_entry(Valtype constant
)
1118 : local_sym_index_(CONSTANT_CODE
)
1119 { this->u_
.constant
= constant
; }
1121 // Write the GOT entry to an output view.
1123 write(unsigned char* pov
) const;
1134 // For a local symbol, the object.
1135 Sized_relobj
<size
, big_endian
>* object
;
1136 // For a global symbol, the symbol.
1138 // For a constant, the constant.
1141 // For a local symbol, the local symbol index. This is GSYM_CODE
1142 // for a global symbol, or CONSTANT_CODE for a constant.
1143 unsigned int local_sym_index_
;
1146 typedef std::vector
<Got_entry
> Got_entries
;
1148 // Return the offset into the GOT of GOT entry I.
1150 got_offset(unsigned int i
) const
1151 { return i
* (size
/ 8); }
1153 // Return the offset into the GOT of the last entry added.
1155 last_got_offset() const
1156 { return this->got_offset(this->entries_
.size() - 1); }
1158 // Set the size of the section.
1161 { this->set_current_data_size(this->got_offset(this->entries_
.size())); }
1163 // The list of GOT entries.
1164 Got_entries entries_
;
1167 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
1170 class Output_data_dynamic
: public Output_section_data
1173 Output_data_dynamic(Stringpool
* pool
)
1174 : Output_section_data(Output_data::default_alignment()),
1175 entries_(), pool_(pool
)
1178 // Add a new dynamic entry with a fixed numeric value.
1180 add_constant(elfcpp::DT tag
, unsigned int val
)
1181 { this->add_entry(Dynamic_entry(tag
, val
)); }
1183 // Add a new dynamic entry with the address of output data.
1185 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
1186 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
1188 // Add a new dynamic entry with the size of output data.
1190 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
1191 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
1193 // Add a new dynamic entry with the address of a symbol.
1195 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
1196 { this->add_entry(Dynamic_entry(tag
, sym
)); }
1198 // Add a new dynamic entry with a string.
1200 add_string(elfcpp::DT tag
, const char* str
)
1201 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
1204 add_string(elfcpp::DT tag
, const std::string
& str
)
1205 { this->add_string(tag
, str
.c_str()); }
1208 // Adjust the output section to set the entry size.
1210 do_adjust_output_section(Output_section
*);
1212 // Set the final data size.
1214 set_final_data_size();
1216 // Write out the dynamic entries.
1218 do_write(Output_file
*);
1221 // This POD class holds a single dynamic entry.
1225 // Create an entry with a fixed numeric value.
1226 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
1227 : tag_(tag
), classification_(DYNAMIC_NUMBER
)
1228 { this->u_
.val
= val
; }
1230 // Create an entry with the size or address of a section.
1231 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
1233 classification_(section_size
1234 ? DYNAMIC_SECTION_SIZE
1235 : DYNAMIC_SECTION_ADDRESS
)
1236 { this->u_
.od
= od
; }
1238 // Create an entry with the address of a symbol.
1239 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
1240 : tag_(tag
), classification_(DYNAMIC_SYMBOL
)
1241 { this->u_
.sym
= sym
; }
1243 // Create an entry with a string.
1244 Dynamic_entry(elfcpp::DT tag
, const char* str
)
1245 : tag_(tag
), classification_(DYNAMIC_STRING
)
1246 { this->u_
.str
= str
; }
1248 // Write the dynamic entry to an output view.
1249 template<int size
, bool big_endian
>
1251 write(unsigned char* pov
, const Stringpool
* ACCEPT_SIZE_ENDIAN
) const;
1259 DYNAMIC_SECTION_ADDRESS
,
1261 DYNAMIC_SECTION_SIZE
,
1270 // For DYNAMIC_NUMBER.
1272 // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE.
1273 const Output_data
* od
;
1274 // For DYNAMIC_SYMBOL.
1276 // For DYNAMIC_STRING.
1281 // The type of entry.
1282 Classification classification_
;
1285 // Add an entry to the list.
1287 add_entry(const Dynamic_entry
& entry
)
1288 { this->entries_
.push_back(entry
); }
1290 // Sized version of write function.
1291 template<int size
, bool big_endian
>
1293 sized_write(Output_file
* of
);
1295 // The type of the list of entries.
1296 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
1299 Dynamic_entries entries_
;
1300 // The pool used for strings.
1304 // An output section. We don't expect to have too many output
1305 // sections, so we don't bother to do a template on the size.
1307 class Output_section
: public Output_data
1310 // Create an output section, giving the name, type, and flags.
1311 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
1312 virtual ~Output_section();
1314 // Add a new input section SHNDX, named NAME, with header SHDR, from
1315 // object OBJECT. RELOC_SHNDX is the index of a relocation section
1316 // which applies to this section, or 0 if none, or -1U if more than
1317 // one. Return the offset within the output section.
1318 template<int size
, bool big_endian
>
1320 add_input_section(Sized_relobj
<size
, big_endian
>* object
, unsigned int shndx
,
1322 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
1323 unsigned int reloc_shndx
);
1325 // Add generated data POSD to this output section.
1327 add_output_section_data(Output_section_data
* posd
);
1329 // Return the section name.
1332 { return this->name_
; }
1334 // Return the section type.
1337 { return this->type_
; }
1339 // Return the section flags.
1342 { return this->flags_
; }
1344 // Return the entsize field.
1347 { return this->entsize_
; }
1349 // Set the entsize field.
1351 set_entsize(uint64_t v
);
1353 // Set the link field to the output section index of a section.
1355 set_link_section(const Output_data
* od
)
1357 gold_assert(this->link_
== 0
1358 && !this->should_link_to_symtab_
1359 && !this->should_link_to_dynsym_
);
1360 this->link_section_
= od
;
1363 // Set the link field to a constant.
1365 set_link(unsigned int v
)
1367 gold_assert(this->link_section_
== NULL
1368 && !this->should_link_to_symtab_
1369 && !this->should_link_to_dynsym_
);
1373 // Record that this section should link to the normal symbol table.
1375 set_should_link_to_symtab()
1377 gold_assert(this->link_section_
== NULL
1379 && !this->should_link_to_dynsym_
);
1380 this->should_link_to_symtab_
= true;
1383 // Record that this section should link to the dynamic symbol table.
1385 set_should_link_to_dynsym()
1387 gold_assert(this->link_section_
== NULL
1389 && !this->should_link_to_symtab_
);
1390 this->should_link_to_dynsym_
= true;
1393 // Return the info field.
1397 gold_assert(this->info_section_
== NULL
);
1401 // Set the info field to the output section index of a section.
1403 set_info_section(const Output_data
* od
)
1405 gold_assert(this->info_
== 0);
1406 this->info_section_
= od
;
1409 // Set the info field to a constant.
1411 set_info(unsigned int v
)
1413 gold_assert(this->info_section_
== NULL
);
1417 // Set the addralign field.
1419 set_addralign(uint64_t v
)
1420 { this->addralign_
= v
; }
1422 // Indicate that we need a symtab index.
1424 set_needs_symtab_index()
1425 { this->needs_symtab_index_
= true; }
1427 // Return whether we need a symtab index.
1429 needs_symtab_index() const
1430 { return this->needs_symtab_index_
; }
1432 // Get the symtab index.
1434 symtab_index() const
1436 gold_assert(this->symtab_index_
!= 0);
1437 return this->symtab_index_
;
1440 // Set the symtab index.
1442 set_symtab_index(unsigned int index
)
1444 gold_assert(index
!= 0);
1445 this->symtab_index_
= index
;
1448 // Indicate that we need a dynsym index.
1450 set_needs_dynsym_index()
1451 { this->needs_dynsym_index_
= true; }
1453 // Return whether we need a dynsym index.
1455 needs_dynsym_index() const
1456 { return this->needs_dynsym_index_
; }
1458 // Get the dynsym index.
1460 dynsym_index() const
1462 gold_assert(this->dynsym_index_
!= 0);
1463 return this->dynsym_index_
;
1466 // Set the dynsym index.
1468 set_dynsym_index(unsigned int index
)
1470 gold_assert(index
!= 0);
1471 this->dynsym_index_
= index
;
1474 // Return whether this section should be written after all the input
1475 // sections are complete.
1477 after_input_sections() const
1478 { return this->after_input_sections_
; }
1480 // Record that this section should be written after all the input
1481 // sections are complete.
1483 set_after_input_sections()
1484 { this->after_input_sections_
= true; }
1486 // Return whether this section requires postprocessing after all
1487 // relocations have been applied.
1489 requires_postprocessing() const
1490 { return this->requires_postprocessing_
; }
1492 // Record that this section requires postprocessing after all
1493 // relocations have been applied.
1495 set_requires_postprocessing()
1496 { this->requires_postprocessing_
= true; }
1498 // Return whether the offset OFFSET in the input section SHNDX in
1499 // object OBJECT is being included in the link.
1501 is_input_address_mapped(const Relobj
* object
, unsigned int shndx
,
1502 off_t offset
) const;
1504 // Return the offset within the output section of OFFSET relative to
1505 // the start of input section SHNDX in object OBJECT.
1507 output_offset(const Relobj
* object
, unsigned int shndx
, off_t offset
) const;
1509 // Return the output virtual address of OFFSET relative to the start
1510 // of input section SHNDX in object OBJECT.
1512 output_address(const Relobj
* object
, unsigned int shndx
,
1513 off_t offset
) const;
1515 // Write the section header into *OPHDR.
1516 template<int size
, bool big_endian
>
1518 write_header(const Layout
*, const Stringpool
*,
1519 elfcpp::Shdr_write
<size
, big_endian
>*) const;
1522 // Return the section index in the output file.
1524 do_out_shndx() const
1526 gold_assert(this->out_shndx_
!= -1U);
1527 return this->out_shndx_
;
1530 // Set the output section index.
1532 do_set_out_shndx(unsigned int shndx
)
1534 gold_assert(this->out_shndx_
== -1U);
1535 this->out_shndx_
= shndx
;
1538 // Set the final data size of the Output_section. For a typical
1539 // Output_section, there is nothing to do, but if there are any
1540 // Output_section_data objects we need to set their final addresses
1543 set_final_data_size();
1545 // Write the data to the file. For a typical Output_section, this
1546 // does nothing: the data is written out by calling Object::Relocate
1547 // on each input object. But if there are any Output_section_data
1548 // objects we do need to write them out here.
1550 do_write(Output_file
*);
1552 // Return the address alignment--function required by parent class.
1554 do_addralign() const
1555 { return this->addralign_
; }
1557 // Return whether this is an Output_section.
1559 do_is_section() const
1562 // Return whether this is a section of the specified type.
1564 do_is_section_type(elfcpp::Elf_Word type
) const
1565 { return this->type_
== type
; }
1567 // Return whether the specified section flag is set.
1569 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
1570 { return (this->flags_
& flag
) != 0; }
1573 // In some cases we need to keep a list of the input sections
1574 // associated with this output section. We only need the list if we
1575 // might have to change the offsets of the input section within the
1576 // output section after we add the input section. The ordinary
1577 // input sections will be written out when we process the object
1578 // file, and as such we don't need to track them here. We do need
1579 // to track Output_section_data objects here. We store instances of
1580 // this structure in a std::vector, so it must be a POD. There can
1581 // be many instances of this structure, so we use a union to save
1587 : shndx_(0), p2align_(0)
1589 this->u1_
.data_size
= 0;
1590 this->u2_
.object
= NULL
;
1593 // For an ordinary input section.
1594 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
1597 p2align_(ffsll(static_cast<long long>(addralign
)))
1599 gold_assert(shndx
!= OUTPUT_SECTION_CODE
1600 && shndx
!= MERGE_DATA_SECTION_CODE
1601 && shndx
!= MERGE_STRING_SECTION_CODE
);
1602 this->u1_
.data_size
= data_size
;
1603 this->u2_
.object
= object
;
1606 // For a non-merge output section.
1607 Input_section(Output_section_data
* posd
)
1608 : shndx_(OUTPUT_SECTION_CODE
),
1609 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
1611 this->u1_
.data_size
= 0;
1612 this->u2_
.posd
= posd
;
1615 // For a merge section.
1616 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
1618 ? MERGE_STRING_SECTION_CODE
1619 : MERGE_DATA_SECTION_CODE
),
1620 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
1622 this->u1_
.entsize
= entsize
;
1623 this->u2_
.posd
= posd
;
1626 // The required alignment.
1630 return (this->p2align_
== 0
1632 : static_cast<uint64_t>(1) << (this->p2align_
- 1));
1635 // Return the required size.
1639 // Return whether this is a merge section which matches the
1642 is_merge_section(bool is_string
, uint64_t entsize
,
1643 uint64_t addralign
) const
1645 return (this->shndx_
== (is_string
1646 ? MERGE_STRING_SECTION_CODE
1647 : MERGE_DATA_SECTION_CODE
)
1648 && this->u1_
.entsize
== entsize
1649 && this->addralign() == addralign
);
1652 // Set the output section.
1654 set_output_section(Output_section
* os
)
1656 gold_assert(!this->is_input_section());
1657 this->u2_
.posd
->set_output_section(os
);
1660 // Set the address and file offset. This is called during
1661 // Layout::finalize. SECOFF is the file offset of the enclosing
1664 set_address(uint64_t addr
, off_t off
, off_t secoff
);
1666 // Add an input section, for SHF_MERGE sections.
1668 add_input_section(Relobj
* object
, unsigned int shndx
)
1670 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
1671 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
1672 return this->u2_
.posd
->add_input_section(object
, shndx
);
1675 // Given an input OBJECT, an input section index SHNDX within that
1676 // object, and an OFFSET relative to the start of that input
1677 // section, return whether or not the output offset is known. If
1678 // this function returns true, it sets *POUTPUT to the output
1681 output_offset(const Relobj
* object
, unsigned int shndx
, off_t offset
,
1682 off_t
*poutput
) const;
1684 // Write out the data. This does nothing for an input section.
1686 write(Output_file
*);
1689 // Code values which appear in shndx_. If the value is not one of
1690 // these codes, it is the input section index in the object file.
1693 // An Output_section_data.
1694 OUTPUT_SECTION_CODE
= -1U,
1695 // An Output_section_data for an SHF_MERGE section with
1696 // SHF_STRINGS not set.
1697 MERGE_DATA_SECTION_CODE
= -2U,
1698 // An Output_section_data for an SHF_MERGE section with
1700 MERGE_STRING_SECTION_CODE
= -3U
1703 // Whether this is an input section.
1705 is_input_section() const
1707 return (this->shndx_
!= OUTPUT_SECTION_CODE
1708 && this->shndx_
!= MERGE_DATA_SECTION_CODE
1709 && this->shndx_
!= MERGE_STRING_SECTION_CODE
);
1712 // For an ordinary input section, this is the section index in the
1713 // input file. For an Output_section_data, this is
1714 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
1715 // MERGE_STRING_SECTION_CODE.
1716 unsigned int shndx_
;
1717 // The required alignment, stored as a power of 2.
1718 unsigned int p2align_
;
1721 // For an ordinary input section, the section size.
1723 // For OUTPUT_SECTION_CODE, this is not used. For
1724 // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
1730 // For an ordinary input section, the object which holds the
1733 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
1734 // MERGE_STRING_SECTION_CODE, the data.
1735 Output_section_data
* posd
;
1739 typedef std::vector
<Input_section
> Input_section_list
;
1741 // Fill data. This is used to fill in data between input sections.
1742 // When we have to keep track of the input sections, we can use an
1743 // Output_data_const, but we don't want to have to keep track of
1744 // input sections just to implement fills. For a fill we record the
1745 // offset, and the actual data to be written out.
1749 Fill(off_t section_offset
, off_t length
)
1750 : section_offset_(section_offset
), length_(length
)
1753 // Return section offset.
1755 section_offset() const
1756 { return this->section_offset_
; }
1758 // Return fill length.
1761 { return this->length_
; }
1764 // The offset within the output section.
1765 off_t section_offset_
;
1766 // The length of the space to fill.
1770 typedef std::vector
<Fill
> Fill_list
;
1772 // Add a new output section by Input_section.
1774 add_output_section_data(Input_section
*);
1776 // Add an SHF_MERGE input section. Returns true if the section was
1779 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
1780 uint64_t entsize
, uint64_t addralign
);
1782 // Add an output SHF_MERGE section POSD to this output section.
1783 // IS_STRING indicates whether it is a SHF_STRINGS section, and
1784 // ENTSIZE is the entity size. This returns the entry added to
1787 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
1790 // Most of these fields are only valid after layout.
1792 // The name of the section. This will point into a Stringpool.
1793 const char* const name_
;
1794 // The section address is in the parent class.
1795 // The section alignment.
1796 uint64_t addralign_
;
1797 // The section entry size.
1799 // The file offset is in the parent class.
1800 // Set the section link field to the index of this section.
1801 const Output_data
* link_section_
;
1802 // If link_section_ is NULL, this is the link field.
1804 // Set the section info field to the index of this section.
1805 const Output_data
* info_section_
;
1806 // If info_section_ is NULL, this is the section info field.
1808 // The section type.
1809 const elfcpp::Elf_Word type_
;
1810 // The section flags.
1811 const elfcpp::Elf_Xword flags_
;
1812 // The section index.
1813 unsigned int out_shndx_
;
1814 // If there is a STT_SECTION for this output section in the normal
1815 // symbol table, this is the symbol index. This starts out as zero.
1816 // It is initialized in Layout::finalize() to be the index, or -1U
1817 // if there isn't one.
1818 unsigned int symtab_index_
;
1819 // If there is a STT_SECTION for this output section in the dynamic
1820 // symbol table, this is the symbol index. This starts out as zero.
1821 // It is initialized in Layout::finalize() to be the index, or -1U
1822 // if there isn't one.
1823 unsigned int dynsym_index_
;
1824 // The input sections. This will be empty in cases where we don't
1825 // need to keep track of them.
1826 Input_section_list input_sections_
;
1827 // The offset of the first entry in input_sections_.
1828 off_t first_input_offset_
;
1829 // The fill data. This is separate from input_sections_ because we
1830 // often will need fill sections without needing to keep track of
1833 // Whether this output section needs a STT_SECTION symbol in the
1834 // normal symbol table. This will be true if there is a relocation
1836 bool needs_symtab_index_
: 1;
1837 // Whether this output section needs a STT_SECTION symbol in the
1838 // dynamic symbol table. This will be true if there is a dynamic
1839 // relocation which needs it.
1840 bool needs_dynsym_index_
: 1;
1841 // Whether the link field of this output section should point to the
1842 // normal symbol table.
1843 bool should_link_to_symtab_
: 1;
1844 // Whether the link field of this output section should point to the
1845 // dynamic symbol table.
1846 bool should_link_to_dynsym_
: 1;
1847 // Whether this section should be written after all the input
1848 // sections are complete.
1849 bool after_input_sections_
: 1;
1850 // Whether this section requires post processing after all
1851 // relocations have been applied.
1852 bool requires_postprocessing_
: 1;
1855 // An output segment. PT_LOAD segments are built from collections of
1856 // output sections. Other segments typically point within PT_LOAD
1857 // segments, and are built directly as needed.
1859 class Output_segment
1862 // Create an output segment, specifying the type and flags.
1863 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
1865 // Return the virtual address.
1868 { return this->vaddr_
; }
1870 // Return the physical address.
1873 { return this->paddr_
; }
1875 // Return the segment type.
1878 { return this->type_
; }
1880 // Return the segment flags.
1883 { return this->flags_
; }
1885 // Return the memory size.
1888 { return this->memsz_
; }
1890 // Return the file size.
1893 { return this->filesz_
; }
1895 // Return the maximum alignment of the Output_data.
1899 // Add an Output_section to this segment.
1901 add_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
1902 { this->add_output_section(os
, seg_flags
, false); }
1904 // Add an Output_section to the start of this segment.
1906 add_initial_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
1907 { this->add_output_section(os
, seg_flags
, true); }
1909 // Add an Output_data (which is not an Output_section) to the start
1912 add_initial_output_data(Output_data
*);
1914 // Return the number of dynamic relocations applied to this segment.
1916 dynamic_reloc_count() const;
1918 // Set the address of the segment to ADDR and the offset to *POFF
1919 // (aligned if necessary), and set the addresses and offsets of all
1920 // contained output sections accordingly. Set the section indexes
1921 // of all contained output sections starting with *PSHNDX. Return
1922 // the address of the immediately following segment. Update *POFF
1923 // and *PSHNDX. This should only be called for a PT_LOAD segment.
1925 set_section_addresses(uint64_t addr
, off_t
* poff
, unsigned int* pshndx
);
1927 // Set the minimum alignment of this segment. This may be adjusted
1928 // upward based on the section alignments.
1930 set_minimum_addralign(uint64_t align
)
1932 gold_assert(!this->is_align_known_
);
1933 this->align_
= align
;
1936 // Set the offset of this segment based on the section. This should
1937 // only be called for a non-PT_LOAD segment.
1941 // Return the number of output sections.
1943 output_section_count() const;
1945 // Write the segment header into *OPHDR.
1946 template<int size
, bool big_endian
>
1948 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
1950 // Write the section headers of associated sections into V.
1951 template<int size
, bool big_endian
>
1953 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
1954 unsigned int* pshndx ACCEPT_SIZE_ENDIAN
) const;
1957 Output_segment(const Output_segment
&);
1958 Output_segment
& operator=(const Output_segment
&);
1960 typedef std::list
<Output_data
*> Output_data_list
;
1962 // Add an Output_section to this segment, specifying front or back.
1964 add_output_section(Output_section
*, elfcpp::Elf_Word seg_flags
,
1967 // Find the maximum alignment in an Output_data_list.
1969 maximum_alignment(const Output_data_list
*);
1971 // Set the section addresses in an Output_data_list.
1973 set_section_list_addresses(Output_data_list
*, uint64_t addr
, off_t
* poff
,
1974 unsigned int* pshndx
);
1976 // Return the number of Output_sections in an Output_data_list.
1978 output_section_count_list(const Output_data_list
*) const;
1980 // Return the number of dynamic relocs in an Output_data_list.
1982 dynamic_reloc_count_list(const Output_data_list
*) const;
1984 // Write the section headers in the list into V.
1985 template<int size
, bool big_endian
>
1987 write_section_headers_list(const Layout
*, const Stringpool
*,
1988 const Output_data_list
*, unsigned char* v
,
1989 unsigned int* pshdx ACCEPT_SIZE_ENDIAN
) const;
1991 // The list of output data with contents attached to this segment.
1992 Output_data_list output_data_
;
1993 // The list of output data without contents attached to this segment.
1994 Output_data_list output_bss_
;
1995 // The segment virtual address.
1997 // The segment physical address.
1999 // The size of the segment in memory.
2001 // The segment alignment. The is_align_known_ field indicates
2002 // whether this has been finalized. It can be set to a minimum
2003 // value before it is finalized.
2005 // The offset of the segment data within the file.
2007 // The size of the segment data in the file.
2009 // The segment type;
2010 elfcpp::Elf_Word type_
;
2011 // The segment flags.
2012 elfcpp::Elf_Word flags_
;
2013 // Whether we have finalized align_.
2014 bool is_align_known_
;
2017 // This class represents the output file.
2022 Output_file(const General_options
& options
, Target
*);
2024 // Get a pointer to the target.
2027 { return this->target_
; }
2029 // Open the output file. FILE_SIZE is the final size of the file.
2031 open(off_t file_size
);
2033 // Resize the output file.
2035 resize(off_t file_size
);
2037 // Close the output file and make sure there are no error.
2041 // We currently always use mmap which makes the view handling quite
2042 // simple. In the future we may support other approaches.
2044 // Write data to the output file.
2046 write(off_t offset
, const void* data
, off_t len
)
2047 { memcpy(this->base_
+ offset
, data
, len
); }
2049 // Get a buffer to use to write to the file, given the offset into
2050 // the file and the size.
2052 get_output_view(off_t start
, off_t size
)
2054 gold_assert(start
>= 0 && size
>= 0 && start
+ size
<= this->file_size_
);
2055 return this->base_
+ start
;
2058 // VIEW must have been returned by get_output_view. Write the
2059 // buffer to the file, passing in the offset and the size.
2061 write_output_view(off_t
, off_t
, unsigned char*)
2064 // Get a read/write buffer. This is used when we want to write part
2065 // of the file, read it in, and write it again.
2067 get_input_output_view(off_t start
, off_t size
)
2068 { return this->get_output_view(start
, size
); }
2070 // Write a read/write buffer back to the file.
2072 write_input_output_view(off_t
, off_t
, unsigned char*)
2075 // Get a read buffer. This is used when we just want to read part
2076 // of the file back it in.
2077 const unsigned char*
2078 get_input_view(off_t start
, off_t size
)
2079 { return this->get_output_view(start
, size
); }
2081 // Release a read bfufer.
2083 free_input_view(off_t
, off_t
, const unsigned char*)
2087 // Map the file into memory.
2092 const General_options
& options_
;
2101 // Base of file mapped into memory.
2102 unsigned char* base_
;
2105 } // End namespace gold.
2107 #endif // !defined(GOLD_OUTPUT_H)