1 // reloc.cc -- relocate input files for gold.
3 // Copyright 2006, 2007, 2008, 2009 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.
27 #include "workqueue.h"
32 #include "target-reloc.h"
38 // Read_relocs methods.
40 // These tasks just read the relocation information from the file.
41 // After reading it, the start another task to process the
42 // information. These tasks requires access to the file.
45 Read_relocs::is_runnable()
47 return this->object_
->is_locked() ? this->object_
->token() : NULL
;
53 Read_relocs::locks(Task_locker
* tl
)
55 tl
->add(this, this->object_
->token());
58 // Read the relocations and then start a Scan_relocs_task.
61 Read_relocs::run(Workqueue
* workqueue
)
63 Read_relocs_data
*rd
= new Read_relocs_data
;
64 this->object_
->read_relocs(rd
);
65 this->object_
->set_relocs_data(rd
);
66 this->object_
->release();
68 // If garbage collection is desired, we must process the relocs
69 // instead of scanning the relocs as reloc processing is necessary
70 // to determine unused sections.
71 if (parameters
->options().gc_sections())
73 workqueue
->queue_next(new Gc_process_relocs(this->options_
,
82 workqueue
->queue_next(new Scan_relocs(this->options_
, this->symtab_
,
83 this->layout_
, this->object_
, rd
,
89 // Return a debugging name for the task.
92 Read_relocs::get_name() const
94 return "Read_relocs " + this->object_
->name();
97 // Gc_process_relocs methods.
99 // These tasks process the relocations read by Read_relocs and
100 // determine which sections are referenced and which are garbage.
101 // This task is done only when --gc-sections is used.
104 Gc_process_relocs::is_runnable()
106 if (this->object_
->is_locked())
107 return this->object_
->token();
112 Gc_process_relocs::locks(Task_locker
* tl
)
114 tl
->add(this, this->object_
->token());
115 tl
->add(this, this->blocker_
);
119 Gc_process_relocs::run(Workqueue
*)
121 this->object_
->gc_process_relocs(this->options_
, this->symtab_
, this->layout_
,
123 this->object_
->release();
126 // Return a debugging name for the task.
129 Gc_process_relocs::get_name() const
131 return "Gc_process_relocs " + this->object_
->name();
134 // Scan_relocs methods.
136 // These tasks scan the relocations read by Read_relocs and mark up
137 // the symbol table to indicate which relocations are required. We
138 // use a lock on the symbol table to keep them from interfering with
142 Scan_relocs::is_runnable()
144 if (!this->symtab_lock_
->is_writable())
145 return this->symtab_lock_
;
146 if (this->object_
->is_locked())
147 return this->object_
->token();
151 // Return the locks we hold: one on the file, one on the symbol table
155 Scan_relocs::locks(Task_locker
* tl
)
157 tl
->add(this, this->object_
->token());
158 tl
->add(this, this->symtab_lock_
);
159 tl
->add(this, this->blocker_
);
165 Scan_relocs::run(Workqueue
*)
167 this->object_
->scan_relocs(this->options_
, this->symtab_
, this->layout_
,
169 this->object_
->release();
174 // Return a debugging name for the task.
177 Scan_relocs::get_name() const
179 return "Scan_relocs " + this->object_
->name();
182 // Relocate_task methods.
184 // We may have to wait for the output sections to be written.
187 Relocate_task::is_runnable()
189 if (this->object_
->relocs_must_follow_section_writes()
190 && this->output_sections_blocker_
->is_blocked())
191 return this->output_sections_blocker_
;
193 if (this->object_
->is_locked())
194 return this->object_
->token();
199 // We want to lock the file while we run. We want to unblock
200 // INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
201 // INPUT_SECTIONS_BLOCKER may be NULL.
204 Relocate_task::locks(Task_locker
* tl
)
206 if (this->input_sections_blocker_
!= NULL
)
207 tl
->add(this, this->input_sections_blocker_
);
208 tl
->add(this, this->final_blocker_
);
209 tl
->add(this, this->object_
->token());
215 Relocate_task::run(Workqueue
*)
217 this->object_
->relocate(this->options_
, this->symtab_
, this->layout_
,
220 // This is normally the last thing we will do with an object, so
221 // uncache all views.
222 this->object_
->clear_view_cache_marks();
224 this->object_
->release();
227 // Return a debugging name for the task.
230 Relocate_task::get_name() const
232 return "Relocate_task " + this->object_
->name();
235 // Read the relocs and local symbols from the object file and store
236 // the information in RD.
238 template<int size
, bool big_endian
>
240 Sized_relobj
<size
, big_endian
>::do_read_relocs(Read_relocs_data
* rd
)
244 unsigned int shnum
= this->shnum();
248 rd
->relocs
.reserve(shnum
/ 2);
250 const Output_sections
& out_sections(this->output_sections());
251 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
253 const unsigned char *pshdrs
= this->get_view(this->elf_file_
.shoff(),
254 shnum
* This::shdr_size
,
256 // Skip the first, dummy, section.
257 const unsigned char *ps
= pshdrs
+ This::shdr_size
;
258 for (unsigned int i
= 1; i
< shnum
; ++i
, ps
+= This::shdr_size
)
260 typename
This::Shdr
shdr(ps
);
262 unsigned int sh_type
= shdr
.get_sh_type();
263 if (sh_type
!= elfcpp::SHT_REL
&& sh_type
!= elfcpp::SHT_RELA
)
266 unsigned int shndx
= this->adjust_shndx(shdr
.get_sh_info());
269 this->error(_("relocation section %u has bad info %u"),
274 Output_section
* os
= out_sections
[shndx
];
278 // We are scanning relocations in order to fill out the GOT and
279 // PLT sections. Relocations for sections which are not
280 // allocated (typically debugging sections) should not add new
281 // GOT and PLT entries. So we skip them unless this is a
282 // relocatable link or we need to emit relocations.
283 typename
This::Shdr
secshdr(pshdrs
+ shndx
* This::shdr_size
);
284 bool is_section_allocated
= ((secshdr
.get_sh_flags() & elfcpp::SHF_ALLOC
)
286 if (!is_section_allocated
287 && !parameters
->options().relocatable()
288 && !parameters
->options().emit_relocs())
291 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx_
)
293 this->error(_("relocation section %u uses unexpected "
295 i
, this->adjust_shndx(shdr
.get_sh_link()));
299 off_t sh_size
= shdr
.get_sh_size();
301 unsigned int reloc_size
;
302 if (sh_type
== elfcpp::SHT_REL
)
303 reloc_size
= elfcpp::Elf_sizes
<size
>::rel_size
;
305 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
306 if (reloc_size
!= shdr
.get_sh_entsize())
308 this->error(_("unexpected entsize for reloc section %u: %lu != %u"),
309 i
, static_cast<unsigned long>(shdr
.get_sh_entsize()),
314 size_t reloc_count
= sh_size
/ reloc_size
;
315 if (static_cast<off_t
>(reloc_count
* reloc_size
) != sh_size
)
317 this->error(_("reloc section %u size %lu uneven"),
318 i
, static_cast<unsigned long>(sh_size
));
322 rd
->relocs
.push_back(Section_relocs());
323 Section_relocs
& sr(rd
->relocs
.back());
325 sr
.data_shndx
= shndx
;
326 sr
.contents
= this->get_lasting_view(shdr
.get_sh_offset(), sh_size
,
328 sr
.sh_type
= sh_type
;
329 sr
.reloc_count
= reloc_count
;
330 sr
.output_section
= os
;
331 sr
.needs_special_offset_handling
= out_offsets
[shndx
] == invalid_address
;
332 sr
.is_data_section_allocated
= is_section_allocated
;
335 // Read the local symbols.
336 gold_assert(this->symtab_shndx_
!= -1U);
337 if (this->symtab_shndx_
== 0 || this->local_symbol_count_
== 0)
338 rd
->local_symbols
= NULL
;
341 typename
This::Shdr
symtabshdr(pshdrs
342 + this->symtab_shndx_
* This::shdr_size
);
343 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
344 const int sym_size
= This::sym_size
;
345 const unsigned int loccount
= this->local_symbol_count_
;
346 gold_assert(loccount
== symtabshdr
.get_sh_info());
347 off_t locsize
= loccount
* sym_size
;
348 rd
->local_symbols
= this->get_lasting_view(symtabshdr
.get_sh_offset(),
349 locsize
, true, true);
353 // Process the relocs to generate mappings from source sections to referenced
354 // sections. This is used during garbage colletion to determine garbage
357 template<int size
, bool big_endian
>
359 Sized_relobj
<size
, big_endian
>::do_gc_process_relocs(const General_options
& options
,
360 Symbol_table
* symtab
,
362 Read_relocs_data
* rd
)
364 Sized_target
<size
, big_endian
>* target
= this->sized_target();
366 const unsigned char* local_symbols
;
367 if (rd
->local_symbols
== NULL
)
368 local_symbols
= NULL
;
370 local_symbols
= rd
->local_symbols
->data();
372 for (Read_relocs_data::Relocs_list::iterator p
= rd
->relocs
.begin();
373 p
!= rd
->relocs
.end();
376 if (!parameters
->options().relocatable())
378 // As noted above, when not generating an object file, we
379 // only scan allocated sections. We may see a non-allocated
380 // section here if we are emitting relocs.
381 if (p
->is_data_section_allocated
)
382 target
->gc_process_relocs(options
, symtab
, layout
, this,
383 p
->data_shndx
, p
->sh_type
,
384 p
->contents
->data(), p
->reloc_count
,
386 p
->needs_special_offset_handling
,
387 this->local_symbol_count_
,
394 // Scan the relocs and adjust the symbol table. This looks for
395 // relocations which require GOT/PLT/COPY relocations.
397 template<int size
, bool big_endian
>
399 Sized_relobj
<size
, big_endian
>::do_scan_relocs(const General_options
& options
,
400 Symbol_table
* symtab
,
402 Read_relocs_data
* rd
)
404 Sized_target
<size
, big_endian
>* target
= this->sized_target();
406 const unsigned char* local_symbols
;
407 if (rd
->local_symbols
== NULL
)
408 local_symbols
= NULL
;
410 local_symbols
= rd
->local_symbols
->data();
412 for (Read_relocs_data::Relocs_list::iterator p
= rd
->relocs
.begin();
413 p
!= rd
->relocs
.end();
416 // When garbage collection is on, unreferenced sections are not included
417 // in the link that would have been included normally. This is known only
418 // after Read_relocs hence this check has to be done again.
419 if (parameters
->options().gc_sections())
421 if (p
->output_section
== NULL
)
424 if (!parameters
->options().relocatable())
426 // As noted above, when not generating an object file, we
427 // only scan allocated sections. We may see a non-allocated
428 // section here if we are emitting relocs.
429 if (p
->is_data_section_allocated
)
430 target
->scan_relocs(options
, symtab
, layout
, this, p
->data_shndx
,
431 p
->sh_type
, p
->contents
->data(),
432 p
->reloc_count
, p
->output_section
,
433 p
->needs_special_offset_handling
,
434 this->local_symbol_count_
,
436 if (parameters
->options().emit_relocs())
437 this->emit_relocs_scan(options
, symtab
, layout
, local_symbols
, p
);
441 Relocatable_relocs
* rr
= this->relocatable_relocs(p
->reloc_shndx
);
442 gold_assert(rr
!= NULL
);
443 rr
->set_reloc_count(p
->reloc_count
);
444 target
->scan_relocatable_relocs(options
, symtab
, layout
, this,
445 p
->data_shndx
, p
->sh_type
,
449 p
->needs_special_offset_handling
,
450 this->local_symbol_count_
,
459 if (rd
->local_symbols
!= NULL
)
461 delete rd
->local_symbols
;
462 rd
->local_symbols
= NULL
;
466 // This is a strategy class we use when scanning for --emit-relocs.
468 template<int sh_type
>
469 class Emit_relocs_strategy
472 // A local non-section symbol.
473 inline Relocatable_relocs::Reloc_strategy
474 local_non_section_strategy(unsigned int, Relobj
*, unsigned int)
475 { return Relocatable_relocs::RELOC_COPY
; }
477 // A local section symbol.
478 inline Relocatable_relocs::Reloc_strategy
479 local_section_strategy(unsigned int, Relobj
*)
481 if (sh_type
== elfcpp::SHT_RELA
)
482 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
;
485 // The addend is stored in the section contents. Since this
486 // is not a relocatable link, we are going to apply the
487 // relocation contents to the section as usual. This means
488 // that we have no way to record the original addend. If the
489 // original addend is not zero, there is basically no way for
490 // the user to handle this correctly. Caveat emptor.
491 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
;
496 inline Relocatable_relocs::Reloc_strategy
497 global_strategy(unsigned int, Relobj
*, unsigned int)
498 { return Relocatable_relocs::RELOC_COPY
; }
501 // Scan the input relocations for --emit-relocs.
503 template<int size
, bool big_endian
>
505 Sized_relobj
<size
, big_endian
>::emit_relocs_scan(
506 const General_options
& options
,
507 Symbol_table
* symtab
,
509 const unsigned char* plocal_syms
,
510 const Read_relocs_data::Relocs_list::iterator
& p
)
512 Relocatable_relocs
* rr
= this->relocatable_relocs(p
->reloc_shndx
);
513 gold_assert(rr
!= NULL
);
514 rr
->set_reloc_count(p
->reloc_count
);
516 if (p
->sh_type
== elfcpp::SHT_REL
)
517 this->emit_relocs_scan_reltype
<elfcpp::SHT_REL
>(options
, symtab
, layout
,
521 gold_assert(p
->sh_type
== elfcpp::SHT_RELA
);
522 this->emit_relocs_scan_reltype
<elfcpp::SHT_RELA
>(options
, symtab
,
523 layout
, plocal_syms
, p
,
528 // Scan the input relocation for --emit-relocs, templatized on the
529 // type of the relocation section.
531 template<int size
, bool big_endian
>
532 template<int sh_type
>
534 Sized_relobj
<size
, big_endian
>::emit_relocs_scan_reltype(
535 const General_options
& options
,
536 Symbol_table
* symtab
,
538 const unsigned char* plocal_syms
,
539 const Read_relocs_data::Relocs_list::iterator
& p
,
540 Relocatable_relocs
* rr
)
542 scan_relocatable_relocs
<size
, big_endian
, sh_type
,
543 Emit_relocs_strategy
<sh_type
> >(
552 p
->needs_special_offset_handling
,
553 this->local_symbol_count_
,
558 // Relocate the input sections and write out the local symbols.
560 template<int size
, bool big_endian
>
562 Sized_relobj
<size
, big_endian
>::do_relocate(const General_options
& options
,
563 const Symbol_table
* symtab
,
564 const Layout
* layout
,
567 unsigned int shnum
= this->shnum();
569 // Read the section headers.
570 const unsigned char* pshdrs
= this->get_view(this->elf_file_
.shoff(),
571 shnum
* This::shdr_size
,
577 // Make two passes over the sections. The first one copies the
578 // section data to the output file. The second one applies
581 this->write_sections(pshdrs
, of
, &views
);
583 // To speed up relocations, we set up hash tables for fast lookup of
584 // input offsets to output addresses.
585 this->initialize_input_to_output_maps();
587 // Apply relocations.
589 this->relocate_sections(options
, symtab
, layout
, pshdrs
, &views
);
591 // After we've done the relocations, we release the hash tables,
592 // since we no longer need them.
593 this->free_input_to_output_maps();
595 // Write out the accumulated views.
596 for (unsigned int i
= 1; i
< shnum
; ++i
)
598 if (views
[i
].view
!= NULL
)
600 if (!views
[i
].is_postprocessing_view
)
602 if (views
[i
].is_input_output_view
)
603 of
->write_input_output_view(views
[i
].offset
,
607 of
->write_output_view(views
[i
].offset
, views
[i
].view_size
,
613 // Write out the local symbols.
614 this->write_local_symbols(of
, layout
->sympool(), layout
->dynpool(),
615 layout
->symtab_xindex(), layout
->dynsym_xindex());
617 // We should no longer need the local symbol values.
618 this->clear_local_symbols();
621 // Sort a Read_multiple vector by file offset.
622 struct Read_multiple_compare
625 operator()(const File_read::Read_multiple_entry
& rme1
,
626 const File_read::Read_multiple_entry
& rme2
) const
627 { return rme1
.file_offset
< rme2
.file_offset
; }
630 // Write section data to the output file. PSHDRS points to the
631 // section headers. Record the views in *PVIEWS for use when
634 template<int size
, bool big_endian
>
636 Sized_relobj
<size
, big_endian
>::write_sections(const unsigned char* pshdrs
,
640 unsigned int shnum
= this->shnum();
641 const Output_sections
& out_sections(this->output_sections());
642 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
644 File_read::Read_multiple rm
;
645 bool is_sorted
= true;
647 const unsigned char* p
= pshdrs
+ This::shdr_size
;
648 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
650 View_size
* pvs
= &(*pviews
)[i
];
654 const Output_section
* os
= out_sections
[i
];
657 Address output_offset
= out_offsets
[i
];
659 typename
This::Shdr
shdr(p
);
661 if (shdr
.get_sh_type() == elfcpp::SHT_NOBITS
)
664 if ((parameters
->options().relocatable()
665 || parameters
->options().emit_relocs())
666 && (shdr
.get_sh_type() == elfcpp::SHT_REL
667 || shdr
.get_sh_type() == elfcpp::SHT_RELA
)
668 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
670 // This is a reloc section in a relocatable link or when
671 // emitting relocs. We don't need to read the input file.
672 // The size and file offset are stored in the
673 // Relocatable_relocs structure.
674 Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
675 gold_assert(rr
!= NULL
);
676 Output_data
* posd
= rr
->output_data();
677 gold_assert(posd
!= NULL
);
679 pvs
->offset
= posd
->offset();
680 pvs
->view_size
= posd
->data_size();
681 pvs
->view
= of
->get_output_view(pvs
->offset
, pvs
->view_size
);
682 pvs
->address
= posd
->address();
683 pvs
->is_input_output_view
= false;
684 pvs
->is_postprocessing_view
= false;
689 // In the normal case, this input section is simply mapped to
690 // the output section at offset OUTPUT_OFFSET.
692 // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is
693 // handled specially--e.g., a .eh_frame section. The relocation
694 // routines need to check for each reloc where it should be
695 // applied. For this case, we need an input/output view for the
696 // entire contents of the section in the output file. We don't
697 // want to copy the contents of the input section to the output
698 // section; the output section contents were already written,
699 // and we waited for them in Relocate_task::is_runnable because
700 // relocs_must_follow_section_writes is set for the object.
702 // Regardless of which of the above cases is true, we have to
703 // check requires_postprocessing of the output section. If that
704 // is false, then we work with views of the output file
705 // directly. If it is true, then we work with a separate
706 // buffer, and the output section is responsible for writing the
707 // final data to the output file.
709 off_t output_section_offset
;
710 Address output_section_size
;
711 if (!os
->requires_postprocessing())
713 output_section_offset
= os
->offset();
714 output_section_size
= convert_types
<Address
, off_t
>(os
->data_size());
718 output_section_offset
= 0;
719 output_section_size
=
720 convert_types
<Address
, off_t
>(os
->postprocessing_buffer_size());
724 section_size_type view_size
;
725 if (output_offset
!= invalid_address
)
727 view_start
= output_section_offset
+ output_offset
;
728 view_size
= convert_to_section_size_type(shdr
.get_sh_size());
732 view_start
= output_section_offset
;
733 view_size
= convert_to_section_size_type(output_section_size
);
739 gold_assert(output_offset
== invalid_address
740 || output_offset
+ view_size
<= output_section_size
);
743 if (os
->requires_postprocessing())
745 unsigned char* buffer
= os
->postprocessing_buffer();
746 view
= buffer
+ view_start
;
747 if (output_offset
!= invalid_address
)
749 off_t sh_offset
= shdr
.get_sh_offset();
750 if (!rm
.empty() && rm
.back().file_offset
> sh_offset
)
752 rm
.push_back(File_read::Read_multiple_entry(sh_offset
,
758 if (output_offset
== invalid_address
)
759 view
= of
->get_input_output_view(view_start
, view_size
);
762 view
= of
->get_output_view(view_start
, view_size
);
763 off_t sh_offset
= shdr
.get_sh_offset();
764 if (!rm
.empty() && rm
.back().file_offset
> sh_offset
)
766 rm
.push_back(File_read::Read_multiple_entry(sh_offset
,
772 pvs
->address
= os
->address();
773 if (output_offset
!= invalid_address
)
774 pvs
->address
+= output_offset
;
775 pvs
->offset
= view_start
;
776 pvs
->view_size
= view_size
;
777 pvs
->is_input_output_view
= output_offset
== invalid_address
;
778 pvs
->is_postprocessing_view
= os
->requires_postprocessing();
781 // Actually read the data.
785 std::sort(rm
.begin(), rm
.end(), Read_multiple_compare());
786 this->read_multiple(rm
);
790 // Relocate section data. VIEWS points to the section data as views
791 // in the output file.
793 template<int size
, bool big_endian
>
795 Sized_relobj
<size
, big_endian
>::relocate_sections(
796 const General_options
& options
,
797 const Symbol_table
* symtab
,
798 const Layout
* layout
,
799 const unsigned char* pshdrs
,
802 unsigned int shnum
= this->shnum();
803 Sized_target
<size
, big_endian
>* target
= this->sized_target();
805 const Output_sections
& out_sections(this->output_sections());
806 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
808 Relocate_info
<size
, big_endian
> relinfo
;
809 relinfo
.options
= &options
;
810 relinfo
.symtab
= symtab
;
811 relinfo
.layout
= layout
;
812 relinfo
.object
= this;
814 const unsigned char* p
= pshdrs
+ This::shdr_size
;
815 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
817 typename
This::Shdr
shdr(p
);
819 unsigned int sh_type
= shdr
.get_sh_type();
820 if (sh_type
!= elfcpp::SHT_REL
&& sh_type
!= elfcpp::SHT_RELA
)
823 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
824 if (index
>= this->shnum())
826 this->error(_("relocation section %u has bad info %u"),
831 Output_section
* os
= out_sections
[index
];
834 // This relocation section is against a section which we
838 Address output_offset
= out_offsets
[index
];
840 gold_assert((*pviews
)[index
].view
!= NULL
);
841 if (parameters
->options().relocatable())
842 gold_assert((*pviews
)[i
].view
!= NULL
);
844 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx_
)
846 gold_error(_("relocation section %u uses unexpected "
848 i
, this->adjust_shndx(shdr
.get_sh_link()));
852 off_t sh_size
= shdr
.get_sh_size();
853 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
854 sh_size
, true, false);
856 unsigned int reloc_size
;
857 if (sh_type
== elfcpp::SHT_REL
)
858 reloc_size
= elfcpp::Elf_sizes
<size
>::rel_size
;
860 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
862 if (reloc_size
!= shdr
.get_sh_entsize())
864 gold_error(_("unexpected entsize for reloc section %u: %lu != %u"),
865 i
, static_cast<unsigned long>(shdr
.get_sh_entsize()),
870 size_t reloc_count
= sh_size
/ reloc_size
;
871 if (static_cast<off_t
>(reloc_count
* reloc_size
) != sh_size
)
873 gold_error(_("reloc section %u size %lu uneven"),
874 i
, static_cast<unsigned long>(sh_size
));
878 gold_assert(output_offset
!= invalid_address
879 || this->relocs_must_follow_section_writes());
881 relinfo
.reloc_shndx
= i
;
882 relinfo
.data_shndx
= index
;
883 if (!parameters
->options().relocatable())
885 target
->relocate_section(&relinfo
,
890 output_offset
== invalid_address
,
891 (*pviews
)[index
].view
,
892 (*pviews
)[index
].address
,
893 (*pviews
)[index
].view_size
);
894 if (parameters
->options().emit_relocs())
895 this->emit_relocs(&relinfo
, i
, sh_type
, prelocs
, reloc_count
,
897 (*pviews
)[index
].view
,
898 (*pviews
)[index
].address
,
899 (*pviews
)[index
].view_size
,
901 (*pviews
)[i
].view_size
);
905 Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
906 target
->relocate_for_relocatable(&relinfo
,
913 (*pviews
)[index
].view
,
914 (*pviews
)[index
].address
,
915 (*pviews
)[index
].view_size
,
917 (*pviews
)[i
].view_size
);
922 // Emit the relocs for --emit-relocs.
924 template<int size
, bool big_endian
>
926 Sized_relobj
<size
, big_endian
>::emit_relocs(
927 const Relocate_info
<size
, big_endian
>* relinfo
,
929 unsigned int sh_type
,
930 const unsigned char* prelocs
,
932 Output_section
* output_section
,
933 typename
elfcpp::Elf_types
<size
>::Elf_Addr offset_in_output_section
,
935 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
936 section_size_type view_size
,
937 unsigned char* reloc_view
,
938 section_size_type reloc_view_size
)
940 if (sh_type
== elfcpp::SHT_REL
)
941 this->emit_relocs_reltype
<elfcpp::SHT_REL
>(relinfo
, i
, prelocs
,
942 reloc_count
, output_section
,
943 offset_in_output_section
,
944 view
, address
, view_size
,
945 reloc_view
, reloc_view_size
);
948 gold_assert(sh_type
== elfcpp::SHT_RELA
);
949 this->emit_relocs_reltype
<elfcpp::SHT_RELA
>(relinfo
, i
, prelocs
,
950 reloc_count
, output_section
,
951 offset_in_output_section
,
952 view
, address
, view_size
,
953 reloc_view
, reloc_view_size
);
957 // Emit the relocs for --emit-relocs, templatized on the type of the
958 // relocation section.
960 template<int size
, bool big_endian
>
961 template<int sh_type
>
963 Sized_relobj
<size
, big_endian
>::emit_relocs_reltype(
964 const Relocate_info
<size
, big_endian
>* relinfo
,
966 const unsigned char* prelocs
,
968 Output_section
* output_section
,
969 typename
elfcpp::Elf_types
<size
>::Elf_Addr offset_in_output_section
,
971 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
972 section_size_type view_size
,
973 unsigned char* reloc_view
,
974 section_size_type reloc_view_size
)
976 const Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
977 relocate_for_relocatable
<size
, big_endian
, sh_type
>(
982 offset_in_output_section
,
991 // Create merge hash tables for the local symbols. These are used to
992 // speed up relocations.
994 template<int size
, bool big_endian
>
996 Sized_relobj
<size
, big_endian
>::initialize_input_to_output_maps()
998 const unsigned int loccount
= this->local_symbol_count_
;
999 for (unsigned int i
= 1; i
< loccount
; ++i
)
1001 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1002 lv
.initialize_input_to_output_map(this);
1006 // Free merge hash tables for the local symbols.
1008 template<int size
, bool big_endian
>
1010 Sized_relobj
<size
, big_endian
>::free_input_to_output_maps()
1012 const unsigned int loccount
= this->local_symbol_count_
;
1013 for (unsigned int i
= 1; i
< loccount
; ++i
)
1015 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1016 lv
.free_input_to_output_map();
1020 // Class Merged_symbol_value.
1024 Merged_symbol_value
<size
>::initialize_input_to_output_map(
1025 const Relobj
* object
,
1026 unsigned int input_shndx
)
1028 Object_merge_map
* map
= object
->merge_map();
1029 map
->initialize_input_to_output_map
<size
>(input_shndx
,
1030 this->output_start_address_
,
1031 &this->output_addresses_
);
1034 // Get the output value corresponding to an input offset if we
1035 // couldn't find it in the hash table.
1038 typename
elfcpp::Elf_types
<size
>::Elf_Addr
1039 Merged_symbol_value
<size
>::value_from_output_section(
1040 const Relobj
* object
,
1041 unsigned int input_shndx
,
1042 typename
elfcpp::Elf_types
<size
>::Elf_Addr input_offset
) const
1044 section_offset_type output_offset
;
1045 bool found
= object
->merge_map()->get_output_offset(NULL
, input_shndx
,
1049 // If this assertion fails, it means that some relocation was
1050 // against a portion of an input merge section which we didn't map
1051 // to the output file and we didn't explicitly discard. We should
1052 // always map all portions of input merge sections.
1055 if (output_offset
== -1)
1058 return this->output_start_address_
+ output_offset
;
1061 // Track_relocs methods.
1063 // Initialize the class to track the relocs. This gets the object,
1064 // the reloc section index, and the type of the relocs. This returns
1065 // false if something goes wrong.
1067 template<int size
, bool big_endian
>
1069 Track_relocs
<size
, big_endian
>::initialize(
1071 unsigned int reloc_shndx
,
1072 unsigned int reloc_type
)
1074 // If RELOC_SHNDX is -1U, it means there is more than one reloc
1075 // section for the .eh_frame section. We can't handle that case.
1076 if (reloc_shndx
== -1U)
1079 // If RELOC_SHNDX is 0, there is no reloc section.
1080 if (reloc_shndx
== 0)
1083 // Get the contents of the reloc section.
1084 this->prelocs_
= object
->section_contents(reloc_shndx
, &this->len_
, false);
1086 if (reloc_type
== elfcpp::SHT_REL
)
1087 this->reloc_size_
= elfcpp::Elf_sizes
<size
>::rel_size
;
1088 else if (reloc_type
== elfcpp::SHT_RELA
)
1089 this->reloc_size_
= elfcpp::Elf_sizes
<size
>::rela_size
;
1093 if (this->len_
% this->reloc_size_
!= 0)
1095 object
->error(_("reloc section size %zu is not a multiple of "
1097 static_cast<size_t>(this->len_
),
1105 // Return the offset of the next reloc, or -1 if there isn't one.
1107 template<int size
, bool big_endian
>
1109 Track_relocs
<size
, big_endian
>::next_offset() const
1111 if (this->pos_
>= this->len_
)
1114 // Rel and Rela start out the same, so we can always use Rel to find
1115 // the r_offset value.
1116 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1117 return rel
.get_r_offset();
1120 // Return the index of the symbol referenced by the next reloc, or -1U
1121 // if there aren't any more relocs.
1123 template<int size
, bool big_endian
>
1125 Track_relocs
<size
, big_endian
>::next_symndx() const
1127 if (this->pos_
>= this->len_
)
1130 // Rel and Rela start out the same, so we can use Rel to find the
1132 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1133 return elfcpp::elf_r_sym
<size
>(rel
.get_r_info());
1136 // Advance to the next reloc whose r_offset is greater than or equal
1137 // to OFFSET. Return the number of relocs we skip.
1139 template<int size
, bool big_endian
>
1141 Track_relocs
<size
, big_endian
>::advance(off_t offset
)
1144 while (this->pos_
< this->len_
)
1146 // Rel and Rela start out the same, so we can always use Rel to
1147 // find the r_offset value.
1148 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1149 if (static_cast<off_t
>(rel
.get_r_offset()) >= offset
)
1152 this->pos_
+= this->reloc_size_
;
1157 // Instantiate the templates we need.
1159 #ifdef HAVE_TARGET_32_LITTLE
1162 Sized_relobj
<32, false>::do_read_relocs(Read_relocs_data
* rd
);
1165 #ifdef HAVE_TARGET_32_BIG
1168 Sized_relobj
<32, true>::do_read_relocs(Read_relocs_data
* rd
);
1171 #ifdef HAVE_TARGET_64_LITTLE
1174 Sized_relobj
<64, false>::do_read_relocs(Read_relocs_data
* rd
);
1177 #ifdef HAVE_TARGET_64_BIG
1180 Sized_relobj
<64, true>::do_read_relocs(Read_relocs_data
* rd
);
1183 #ifdef HAVE_TARGET_32_LITTLE
1186 Sized_relobj
<32, false>::do_gc_process_relocs(const General_options
& options
,
1187 Symbol_table
* symtab
,
1189 Read_relocs_data
* rd
);
1192 #ifdef HAVE_TARGET_32_BIG
1195 Sized_relobj
<32, true>::do_gc_process_relocs(const General_options
& options
,
1196 Symbol_table
* symtab
,
1198 Read_relocs_data
* rd
);
1201 #ifdef HAVE_TARGET_64_LITTLE
1204 Sized_relobj
<64, false>::do_gc_process_relocs(const General_options
& options
,
1205 Symbol_table
* symtab
,
1207 Read_relocs_data
* rd
);
1210 #ifdef HAVE_TARGET_64_BIG
1213 Sized_relobj
<64, true>::do_gc_process_relocs(const General_options
& options
,
1214 Symbol_table
* symtab
,
1216 Read_relocs_data
* rd
);
1219 #ifdef HAVE_TARGET_32_LITTLE
1222 Sized_relobj
<32, false>::do_scan_relocs(const General_options
& options
,
1223 Symbol_table
* symtab
,
1225 Read_relocs_data
* rd
);
1228 #ifdef HAVE_TARGET_32_BIG
1231 Sized_relobj
<32, true>::do_scan_relocs(const General_options
& options
,
1232 Symbol_table
* symtab
,
1234 Read_relocs_data
* rd
);
1237 #ifdef HAVE_TARGET_64_LITTLE
1240 Sized_relobj
<64, false>::do_scan_relocs(const General_options
& options
,
1241 Symbol_table
* symtab
,
1243 Read_relocs_data
* rd
);
1246 #ifdef HAVE_TARGET_64_BIG
1249 Sized_relobj
<64, true>::do_scan_relocs(const General_options
& options
,
1250 Symbol_table
* symtab
,
1252 Read_relocs_data
* rd
);
1255 #ifdef HAVE_TARGET_32_LITTLE
1258 Sized_relobj
<32, false>::do_relocate(const General_options
& options
,
1259 const Symbol_table
* symtab
,
1260 const Layout
* layout
,
1264 #ifdef HAVE_TARGET_32_BIG
1267 Sized_relobj
<32, true>::do_relocate(const General_options
& options
,
1268 const Symbol_table
* symtab
,
1269 const Layout
* layout
,
1273 #ifdef HAVE_TARGET_64_LITTLE
1276 Sized_relobj
<64, false>::do_relocate(const General_options
& options
,
1277 const Symbol_table
* symtab
,
1278 const Layout
* layout
,
1282 #ifdef HAVE_TARGET_64_BIG
1285 Sized_relobj
<64, true>::do_relocate(const General_options
& options
,
1286 const Symbol_table
* symtab
,
1287 const Layout
* layout
,
1291 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1293 class Merged_symbol_value
<32>;
1296 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1298 class Merged_symbol_value
<64>;
1301 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1303 class Symbol_value
<32>;
1306 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1308 class Symbol_value
<64>;
1311 #ifdef HAVE_TARGET_32_LITTLE
1313 class Track_relocs
<32, false>;
1316 #ifdef HAVE_TARGET_32_BIG
1318 class Track_relocs
<32, true>;
1321 #ifdef HAVE_TARGET_64_LITTLE
1323 class Track_relocs
<64, false>;
1326 #ifdef HAVE_TARGET_64_BIG
1328 class Track_relocs
<64, true>;
1331 } // End namespace gold.