1 // reloc.cc -- relocate input files for gold.
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.
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_
->release();
67 workqueue
->queue_front(new Scan_relocs(this->options_
, this->symtab_
,
68 this->layout_
, this->object_
, rd
,
69 this->symtab_lock_
, this->blocker_
));
72 // Return a debugging name for the task.
75 Read_relocs::get_name() const
77 return "Read_relocs " + this->object_
->name();
80 // Scan_relocs methods.
82 // These tasks scan the relocations read by Read_relocs and mark up
83 // the symbol table to indicate which relocations are required. We
84 // use a lock on the symbol table to keep them from interfering with
88 Scan_relocs::is_runnable()
90 if (!this->symtab_lock_
->is_writable())
91 return this->symtab_lock_
;
92 if (this->object_
->is_locked())
93 return this->object_
->token();
97 // Return the locks we hold: one on the file, one on the symbol table
101 Scan_relocs::locks(Task_locker
* tl
)
103 tl
->add(this, this->object_
->token());
104 tl
->add(this, this->symtab_lock_
);
105 tl
->add(this, this->blocker_
);
111 Scan_relocs::run(Workqueue
*)
113 this->object_
->scan_relocs(this->options_
, this->symtab_
, this->layout_
,
115 this->object_
->release();
120 // Return a debugging name for the task.
123 Scan_relocs::get_name() const
125 return "Scan_relocs " + this->object_
->name();
128 // Relocate_task methods.
130 // We may have to wait for the output sections to be written.
133 Relocate_task::is_runnable()
135 if (this->object_
->relocs_must_follow_section_writes()
136 && this->output_sections_blocker_
->is_blocked())
137 return this->output_sections_blocker_
;
139 if (this->object_
->is_locked())
140 return this->object_
->token();
145 // We want to lock the file while we run. We want to unblock
146 // INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
147 // INPUT_SECTIONS_BLOCKER may be NULL.
150 Relocate_task::locks(Task_locker
* tl
)
152 if (this->input_sections_blocker_
!= NULL
)
153 tl
->add(this, this->input_sections_blocker_
);
154 tl
->add(this, this->final_blocker_
);
155 tl
->add(this, this->object_
->token());
161 Relocate_task::run(Workqueue
*)
163 this->object_
->relocate(this->options_
, this->symtab_
, this->layout_
,
166 // This is normally the last thing we will do with an object, so
167 // uncache all views.
168 this->object_
->clear_view_cache_marks();
170 this->object_
->release();
173 // Return a debugging name for the task.
176 Relocate_task::get_name() const
178 return "Relocate_task " + this->object_
->name();
181 // Read the relocs and local symbols from the object file and store
182 // the information in RD.
184 template<int size
, bool big_endian
>
186 Sized_relobj
<size
, big_endian
>::do_read_relocs(Read_relocs_data
* rd
)
190 unsigned int shnum
= this->shnum();
194 rd
->relocs
.reserve(shnum
/ 2);
196 std::vector
<Map_to_output
>& map_sections(this->map_to_output());
198 const unsigned char *pshdrs
= this->get_view(this->elf_file_
.shoff(),
199 shnum
* This::shdr_size
,
201 // Skip the first, dummy, section.
202 const unsigned char *ps
= pshdrs
+ This::shdr_size
;
203 for (unsigned int i
= 1; i
< shnum
; ++i
, ps
+= This::shdr_size
)
205 typename
This::Shdr
shdr(ps
);
207 unsigned int sh_type
= shdr
.get_sh_type();
208 if (sh_type
!= elfcpp::SHT_REL
&& sh_type
!= elfcpp::SHT_RELA
)
211 unsigned int shndx
= shdr
.get_sh_info();
214 this->error(_("relocation section %u has bad info %u"),
219 Output_section
* os
= map_sections
[shndx
].output_section
;
223 // We are scanning relocations in order to fill out the GOT and
224 // PLT sections. Relocations for sections which are not
225 // allocated (typically debugging sections) should not add new
226 // GOT and PLT entries. So we skip them unless this is a
227 // relocatable link or we need to emit relocations.
228 typename
This::Shdr
secshdr(pshdrs
+ shndx
* This::shdr_size
);
229 bool is_section_allocated
= ((secshdr
.get_sh_flags() & elfcpp::SHF_ALLOC
)
231 if (!is_section_allocated
232 && !parameters
->output_is_object()
233 && !parameters
->emit_relocs())
236 if (shdr
.get_sh_link() != this->symtab_shndx_
)
238 this->error(_("relocation section %u uses unexpected "
240 i
, shdr
.get_sh_link());
244 off_t sh_size
= shdr
.get_sh_size();
246 unsigned int reloc_size
;
247 if (sh_type
== elfcpp::SHT_REL
)
248 reloc_size
= elfcpp::Elf_sizes
<size
>::rel_size
;
250 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
251 if (reloc_size
!= shdr
.get_sh_entsize())
253 this->error(_("unexpected entsize for reloc section %u: %lu != %u"),
254 i
, static_cast<unsigned long>(shdr
.get_sh_entsize()),
259 size_t reloc_count
= sh_size
/ reloc_size
;
260 if (static_cast<off_t
>(reloc_count
* reloc_size
) != sh_size
)
262 this->error(_("reloc section %u size %lu uneven"),
263 i
, static_cast<unsigned long>(sh_size
));
267 rd
->relocs
.push_back(Section_relocs());
268 Section_relocs
& sr(rd
->relocs
.back());
270 sr
.data_shndx
= shndx
;
271 sr
.contents
= this->get_lasting_view(shdr
.get_sh_offset(), sh_size
,
273 sr
.sh_type
= sh_type
;
274 sr
.reloc_count
= reloc_count
;
275 sr
.output_section
= os
;
276 sr
.needs_special_offset_handling
= map_sections
[shndx
].offset
== -1;
277 sr
.is_data_section_allocated
= is_section_allocated
;
280 // Read the local symbols.
281 gold_assert(this->symtab_shndx_
!= -1U);
282 if (this->symtab_shndx_
== 0 || this->local_symbol_count_
== 0)
283 rd
->local_symbols
= NULL
;
286 typename
This::Shdr
symtabshdr(pshdrs
287 + this->symtab_shndx_
* This::shdr_size
);
288 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
289 const int sym_size
= This::sym_size
;
290 const unsigned int loccount
= this->local_symbol_count_
;
291 gold_assert(loccount
== symtabshdr
.get_sh_info());
292 off_t locsize
= loccount
* sym_size
;
293 rd
->local_symbols
= this->get_lasting_view(symtabshdr
.get_sh_offset(),
298 // Scan the relocs and adjust the symbol table. This looks for
299 // relocations which require GOT/PLT/COPY relocations.
301 template<int size
, bool big_endian
>
303 Sized_relobj
<size
, big_endian
>::do_scan_relocs(const General_options
& options
,
304 Symbol_table
* symtab
,
306 Read_relocs_data
* rd
)
308 Sized_target
<size
, big_endian
>* target
= this->sized_target();
310 const unsigned char* local_symbols
;
311 if (rd
->local_symbols
== NULL
)
312 local_symbols
= NULL
;
314 local_symbols
= rd
->local_symbols
->data();
316 for (Read_relocs_data::Relocs_list::iterator p
= rd
->relocs
.begin();
317 p
!= rd
->relocs
.end();
320 if (!parameters
->output_is_object())
322 // As noted above, when not generating an object file, we
323 // only scan allocated sections. We may see a non-allocated
324 // section here if we are emitting relocs.
325 if (p
->is_data_section_allocated
)
326 target
->scan_relocs(options
, symtab
, layout
, this, p
->data_shndx
,
327 p
->sh_type
, p
->contents
->data(),
328 p
->reloc_count
, p
->output_section
,
329 p
->needs_special_offset_handling
,
330 this->local_symbol_count_
,
332 if (parameters
->emit_relocs())
333 this->emit_relocs_scan(options
, symtab
, layout
, local_symbols
, p
);
337 Relocatable_relocs
* rr
= this->relocatable_relocs(p
->reloc_shndx
);
338 gold_assert(rr
!= NULL
);
339 rr
->set_reloc_count(p
->reloc_count
);
340 target
->scan_relocatable_relocs(options
, symtab
, layout
, this,
341 p
->data_shndx
, p
->sh_type
,
345 p
->needs_special_offset_handling
,
346 this->local_symbol_count_
,
355 if (rd
->local_symbols
!= NULL
)
357 delete rd
->local_symbols
;
358 rd
->local_symbols
= NULL
;
362 // This is a strategy class we use when scanning for --emit-relocs.
364 template<int sh_type
>
365 class Emit_relocs_strategy
368 // A local non-section symbol.
369 inline Relocatable_relocs::Reloc_strategy
370 local_non_section_strategy(unsigned int, Relobj
*)
371 { return Relocatable_relocs::RELOC_COPY
; }
373 // A local section symbol.
374 inline Relocatable_relocs::Reloc_strategy
375 local_section_strategy(unsigned int, Relobj
*)
377 if (sh_type
== elfcpp::SHT_RELA
)
378 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
;
381 // The addend is stored in the section contents. Since this
382 // is not a relocatable link, we are going to apply the
383 // relocation contents to the section as usual. This means
384 // that we have no way to record the original addend. If the
385 // original addend is not zero, there is basically no way for
386 // the user to handle this correctly. Caveat emptor.
387 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
;
392 inline Relocatable_relocs::Reloc_strategy
393 global_strategy(unsigned int, Relobj
*, unsigned int)
394 { return Relocatable_relocs::RELOC_COPY
; }
397 // Scan the input relocations for --emit-relocs.
399 template<int size
, bool big_endian
>
401 Sized_relobj
<size
, big_endian
>::emit_relocs_scan(
402 const General_options
& options
,
403 Symbol_table
* symtab
,
405 const unsigned char* plocal_syms
,
406 const Read_relocs_data::Relocs_list::iterator
& p
)
408 Relocatable_relocs
* rr
= this->relocatable_relocs(p
->reloc_shndx
);
409 gold_assert(rr
!= NULL
);
410 rr
->set_reloc_count(p
->reloc_count
);
412 if (p
->sh_type
== elfcpp::SHT_REL
)
413 this->emit_relocs_scan_reltype
<elfcpp::SHT_REL
>(options
, symtab
, layout
,
417 gold_assert(p
->sh_type
== elfcpp::SHT_RELA
);
418 this->emit_relocs_scan_reltype
<elfcpp::SHT_RELA
>(options
, symtab
,
419 layout
, plocal_syms
, p
,
424 // Scan the input relocation for --emit-relocs, templatized on the
425 // type of the relocation section.
427 template<int size
, bool big_endian
>
428 template<int sh_type
>
430 Sized_relobj
<size
, big_endian
>::emit_relocs_scan_reltype(
431 const General_options
& options
,
432 Symbol_table
* symtab
,
434 const unsigned char* plocal_syms
,
435 const Read_relocs_data::Relocs_list::iterator
& p
,
436 Relocatable_relocs
* rr
)
438 scan_relocatable_relocs
<size
, big_endian
, sh_type
,
439 Emit_relocs_strategy
<sh_type
> >(
448 p
->needs_special_offset_handling
,
449 this->local_symbol_count_
,
454 // Relocate the input sections and write out the local symbols.
456 template<int size
, bool big_endian
>
458 Sized_relobj
<size
, big_endian
>::do_relocate(const General_options
& options
,
459 const Symbol_table
* symtab
,
460 const Layout
* layout
,
463 unsigned int shnum
= this->shnum();
465 // Read the section headers.
466 const unsigned char* pshdrs
= this->get_view(this->elf_file_
.shoff(),
467 shnum
* This::shdr_size
,
473 // Make two passes over the sections. The first one copies the
474 // section data to the output file. The second one applies
477 this->write_sections(pshdrs
, of
, &views
);
479 // To speed up relocations, we set up hash tables for fast lookup of
480 // input offsets to output addresses.
481 this->initialize_input_to_output_maps();
483 // Apply relocations.
485 this->relocate_sections(options
, symtab
, layout
, pshdrs
, &views
);
487 // After we've done the relocations, we release the hash tables,
488 // since we no longer need them.
489 this->free_input_to_output_maps();
491 // Write out the accumulated views.
492 for (unsigned int i
= 1; i
< shnum
; ++i
)
494 if (views
[i
].view
!= NULL
)
496 if (!views
[i
].is_postprocessing_view
)
498 if (views
[i
].is_input_output_view
)
499 of
->write_input_output_view(views
[i
].offset
,
503 of
->write_output_view(views
[i
].offset
, views
[i
].view_size
,
509 // Write out the local symbols.
510 this->write_local_symbols(of
, layout
->sympool(), layout
->dynpool());
512 // We should no longer need the local symbol values.
513 this->clear_local_symbols();
516 // Sort a Read_multiple vector by file offset.
517 struct Read_multiple_compare
520 operator()(const File_read::Read_multiple_entry
& rme1
,
521 const File_read::Read_multiple_entry
& rme2
) const
522 { return rme1
.file_offset
< rme2
.file_offset
; }
525 // Write section data to the output file. PSHDRS points to the
526 // section headers. Record the views in *PVIEWS for use when
529 template<int size
, bool big_endian
>
531 Sized_relobj
<size
, big_endian
>::write_sections(const unsigned char* pshdrs
,
535 unsigned int shnum
= this->shnum();
536 const std::vector
<Map_to_output
>& map_sections(this->map_to_output());
538 File_read::Read_multiple rm
;
539 bool is_sorted
= true;
541 const unsigned char* p
= pshdrs
+ This::shdr_size
;
542 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
544 View_size
* pvs
= &(*pviews
)[i
];
548 const Output_section
* os
= map_sections
[i
].output_section
;
551 off_t output_offset
= map_sections
[i
].offset
;
553 typename
This::Shdr
shdr(p
);
555 if (shdr
.get_sh_type() == elfcpp::SHT_NOBITS
)
558 if ((parameters
->output_is_object() || parameters
->emit_relocs())
559 && (shdr
.get_sh_type() == elfcpp::SHT_REL
560 || shdr
.get_sh_type() == elfcpp::SHT_RELA
)
561 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
563 // This is a reloc section in a relocatable link or when
564 // emitting relocs. We don't need to read the input file.
565 // The size and file offset are stored in the
566 // Relocatable_relocs structure.
567 Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
568 gold_assert(rr
!= NULL
);
569 Output_data
* posd
= rr
->output_data();
570 gold_assert(posd
!= NULL
);
572 pvs
->offset
= posd
->offset();
573 pvs
->view_size
= posd
->data_size();
574 pvs
->view
= of
->get_output_view(pvs
->offset
, pvs
->view_size
);
575 pvs
->address
= posd
->address();
576 pvs
->is_input_output_view
= false;
577 pvs
->is_postprocessing_view
= false;
582 // In the normal case, this input section is simply mapped to
583 // the output section at offset OUTPUT_OFFSET.
585 // However, if OUTPUT_OFFSET == -1, then input data is handled
586 // specially--e.g., a .eh_frame section. The relocation
587 // routines need to check for each reloc where it should be
588 // applied. For this case, we need an input/output view for the
589 // entire contents of the section in the output file. We don't
590 // want to copy the contents of the input section to the output
591 // section; the output section contents were already written,
592 // and we waited for them in Relocate_task::is_runnable because
593 // relocs_must_follow_section_writes is set for the object.
595 // Regardless of which of the above cases is true, we have to
596 // check requires_postprocessing of the output section. If that
597 // is false, then we work with views of the output file
598 // directly. If it is true, then we work with a separate
599 // buffer, and the output section is responsible for writing the
600 // final data to the output file.
602 off_t output_section_offset
;
603 off_t output_section_size
;
604 if (!os
->requires_postprocessing())
606 output_section_offset
= os
->offset();
607 output_section_size
= os
->data_size();
611 output_section_offset
= 0;
612 output_section_size
= os
->postprocessing_buffer_size();
616 section_size_type view_size
;
617 if (output_offset
!= -1)
619 view_start
= output_section_offset
+ output_offset
;
620 view_size
= convert_to_section_size_type(shdr
.get_sh_size());
624 view_start
= output_section_offset
;
625 view_size
= convert_to_section_size_type(output_section_size
);
631 gold_assert(output_offset
== -1
632 || (output_offset
>= 0
633 && (output_offset
+ static_cast<off_t
>(view_size
)
634 <= output_section_size
)));
637 if (os
->requires_postprocessing())
639 unsigned char* buffer
= os
->postprocessing_buffer();
640 view
= buffer
+ view_start
;
641 if (output_offset
!= -1)
643 off_t sh_offset
= shdr
.get_sh_offset();
644 if (!rm
.empty() && rm
.back().file_offset
> sh_offset
)
646 rm
.push_back(File_read::Read_multiple_entry(sh_offset
,
652 if (output_offset
== -1)
653 view
= of
->get_input_output_view(view_start
, view_size
);
656 view
= of
->get_output_view(view_start
, view_size
);
657 off_t sh_offset
= shdr
.get_sh_offset();
658 if (!rm
.empty() && rm
.back().file_offset
> sh_offset
)
660 rm
.push_back(File_read::Read_multiple_entry(sh_offset
,
666 pvs
->address
= os
->address();
667 if (output_offset
!= -1)
668 pvs
->address
+= output_offset
;
669 pvs
->offset
= view_start
;
670 pvs
->view_size
= view_size
;
671 pvs
->is_input_output_view
= output_offset
== -1;
672 pvs
->is_postprocessing_view
= os
->requires_postprocessing();
675 // Actually read the data.
679 std::sort(rm
.begin(), rm
.end(), Read_multiple_compare());
680 this->read_multiple(rm
);
684 // Relocate section data. VIEWS points to the section data as views
685 // in the output file.
687 template<int size
, bool big_endian
>
689 Sized_relobj
<size
, big_endian
>::relocate_sections(
690 const General_options
& options
,
691 const Symbol_table
* symtab
,
692 const Layout
* layout
,
693 const unsigned char* pshdrs
,
696 unsigned int shnum
= this->shnum();
697 Sized_target
<size
, big_endian
>* target
= this->sized_target();
699 const std::vector
<Map_to_output
>& map_sections(this->map_to_output());
701 Relocate_info
<size
, big_endian
> relinfo
;
702 relinfo
.options
= &options
;
703 relinfo
.symtab
= symtab
;
704 relinfo
.layout
= layout
;
705 relinfo
.object
= this;
707 const unsigned char* p
= pshdrs
+ This::shdr_size
;
708 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
710 typename
This::Shdr
shdr(p
);
712 unsigned int sh_type
= shdr
.get_sh_type();
713 if (sh_type
!= elfcpp::SHT_REL
&& sh_type
!= elfcpp::SHT_RELA
)
716 unsigned int index
= shdr
.get_sh_info();
717 if (index
>= this->shnum())
719 this->error(_("relocation section %u has bad info %u"),
724 Output_section
* os
= map_sections
[index
].output_section
;
727 // This relocation section is against a section which we
731 off_t output_offset
= map_sections
[index
].offset
;
733 gold_assert((*pviews
)[index
].view
!= NULL
);
734 if (parameters
->output_is_object())
735 gold_assert((*pviews
)[i
].view
!= NULL
);
737 if (shdr
.get_sh_link() != this->symtab_shndx_
)
739 gold_error(_("relocation section %u uses unexpected "
741 i
, shdr
.get_sh_link());
745 off_t sh_size
= shdr
.get_sh_size();
746 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
749 unsigned int reloc_size
;
750 if (sh_type
== elfcpp::SHT_REL
)
751 reloc_size
= elfcpp::Elf_sizes
<size
>::rel_size
;
753 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
755 if (reloc_size
!= shdr
.get_sh_entsize())
757 gold_error(_("unexpected entsize for reloc section %u: %lu != %u"),
758 i
, static_cast<unsigned long>(shdr
.get_sh_entsize()),
763 size_t reloc_count
= sh_size
/ reloc_size
;
764 if (static_cast<off_t
>(reloc_count
* reloc_size
) != sh_size
)
766 gold_error(_("reloc section %u size %lu uneven"),
767 i
, static_cast<unsigned long>(sh_size
));
771 gold_assert(output_offset
!= -1
772 || this->relocs_must_follow_section_writes());
774 relinfo
.reloc_shndx
= i
;
775 relinfo
.data_shndx
= index
;
776 if (!parameters
->output_is_object())
778 target
->relocate_section(&relinfo
,
784 (*pviews
)[index
].view
,
785 (*pviews
)[index
].address
,
786 (*pviews
)[index
].view_size
);
787 if (parameters
->emit_relocs())
788 this->emit_relocs(&relinfo
, i
, sh_type
, prelocs
, reloc_count
,
790 (*pviews
)[index
].view
,
791 (*pviews
)[index
].address
,
792 (*pviews
)[index
].view_size
,
794 (*pviews
)[i
].view_size
);
798 Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
799 target
->relocate_for_relocatable(&relinfo
,
806 (*pviews
)[index
].view
,
807 (*pviews
)[index
].address
,
808 (*pviews
)[index
].view_size
,
810 (*pviews
)[i
].view_size
);
815 // Emit the relocs for --emit-relocs.
817 template<int size
, bool big_endian
>
819 Sized_relobj
<size
, big_endian
>::emit_relocs(
820 const Relocate_info
<size
, big_endian
>* relinfo
,
822 unsigned int sh_type
,
823 const unsigned char* prelocs
,
825 Output_section
* output_section
,
826 off_t offset_in_output_section
,
828 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
829 section_size_type view_size
,
830 unsigned char* reloc_view
,
831 section_size_type reloc_view_size
)
833 if (sh_type
== elfcpp::SHT_REL
)
834 this->emit_relocs_reltype
<elfcpp::SHT_REL
>(relinfo
, i
, prelocs
,
835 reloc_count
, output_section
,
836 offset_in_output_section
,
837 view
, address
, view_size
,
838 reloc_view
, reloc_view_size
);
841 gold_assert(sh_type
== elfcpp::SHT_RELA
);
842 this->emit_relocs_reltype
<elfcpp::SHT_RELA
>(relinfo
, i
, prelocs
,
843 reloc_count
, output_section
,
844 offset_in_output_section
,
845 view
, address
, view_size
,
846 reloc_view
, reloc_view_size
);
850 // Emit the relocs for --emit-relocs, templatized on the type of the
851 // relocation section.
853 template<int size
, bool big_endian
>
854 template<int sh_type
>
856 Sized_relobj
<size
, big_endian
>::emit_relocs_reltype(
857 const Relocate_info
<size
, big_endian
>* relinfo
,
859 const unsigned char* prelocs
,
861 Output_section
* output_section
,
862 off_t offset_in_output_section
,
864 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
865 section_size_type view_size
,
866 unsigned char* reloc_view
,
867 section_size_type reloc_view_size
)
869 const Relocatable_relocs
* rr
= this->relocatable_relocs(i
);
870 relocate_for_relocatable
<size
, big_endian
, sh_type
>(
875 offset_in_output_section
,
884 // Create merge hash tables for the local symbols. These are used to
885 // speed up relocations.
887 template<int size
, bool big_endian
>
889 Sized_relobj
<size
, big_endian
>::initialize_input_to_output_maps()
891 const unsigned int loccount
= this->local_symbol_count_
;
892 for (unsigned int i
= 1; i
< loccount
; ++i
)
894 Symbol_value
<size
>& lv(this->local_values_
[i
]);
895 lv
.initialize_input_to_output_map(this);
899 // Free merge hash tables for the local symbols.
901 template<int size
, bool big_endian
>
903 Sized_relobj
<size
, big_endian
>::free_input_to_output_maps()
905 const unsigned int loccount
= this->local_symbol_count_
;
906 for (unsigned int i
= 1; i
< loccount
; ++i
)
908 Symbol_value
<size
>& lv(this->local_values_
[i
]);
909 lv
.free_input_to_output_map();
913 // Class Merged_symbol_value.
917 Merged_symbol_value
<size
>::initialize_input_to_output_map(
918 const Relobj
* object
,
919 unsigned int input_shndx
)
921 Object_merge_map
* map
= object
->merge_map();
922 map
->initialize_input_to_output_map
<size
>(input_shndx
,
923 this->output_start_address_
,
924 &this->output_addresses_
);
927 // Get the output value corresponding to an input offset if we
928 // couldn't find it in the hash table.
931 typename
elfcpp::Elf_types
<size
>::Elf_Addr
932 Merged_symbol_value
<size
>::value_from_output_section(
933 const Relobj
* object
,
934 unsigned int input_shndx
,
935 typename
elfcpp::Elf_types
<size
>::Elf_Addr input_offset
) const
937 section_offset_type output_offset
;
938 bool found
= object
->merge_map()->get_output_offset(NULL
, input_shndx
,
942 // If this assertion fails, it means that some relocation was
943 // against a portion of an input merge section which we didn't map
944 // to the output file and we didn't explicitly discard. We should
945 // always map all portions of input merge sections.
948 if (output_offset
== -1)
951 return this->output_start_address_
+ output_offset
;
954 // Copy_relocs::Copy_reloc_entry methods.
956 // Return whether we should emit this reloc. We should emit it if the
957 // symbol is still defined in a dynamic object. If we should not emit
958 // it, we clear it, to save ourselves the test next time.
960 template<int size
, bool big_endian
>
962 Copy_relocs
<size
, big_endian
>::Copy_reloc_entry::should_emit()
964 if (this->sym_
== NULL
)
966 if (this->sym_
->is_from_dynobj())
972 // Emit a reloc into a SHT_REL section.
974 template<int size
, bool big_endian
>
976 Copy_relocs
<size
, big_endian
>::Copy_reloc_entry::emit(
977 Output_data_reloc
<elfcpp::SHT_REL
, true, size
, big_endian
>* reloc_data
)
979 this->sym_
->set_needs_dynsym_entry();
980 reloc_data
->add_global(this->sym_
, this->reloc_type_
, this->output_section_
,
981 this->relobj_
, this->shndx_
, this->address_
);
984 // Emit a reloc into a SHT_RELA section.
986 template<int size
, bool big_endian
>
988 Copy_relocs
<size
, big_endian
>::Copy_reloc_entry::emit(
989 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>* reloc_data
)
991 this->sym_
->set_needs_dynsym_entry();
992 reloc_data
->add_global(this->sym_
, this->reloc_type_
, this->output_section_
,
993 this->relobj_
, this->shndx_
, this->address_
,
997 // Copy_relocs methods.
999 // Return whether we need a COPY reloc for a relocation against GSYM.
1000 // The relocation is being applied to section SHNDX in OBJECT.
1002 template<int size
, bool big_endian
>
1004 Copy_relocs
<size
, big_endian
>::need_copy_reloc(
1005 const General_options
*,
1008 Sized_symbol
<size
>* sym
)
1010 // FIXME: Handle -z nocopyrelocs.
1012 if (sym
->symsize() == 0)
1015 // If this is a readonly section, then we need a COPY reloc.
1016 // Otherwise we can use a dynamic reloc.
1017 if ((object
->section_flags(shndx
) & elfcpp::SHF_WRITE
) == 0)
1023 // Save a Rel reloc.
1025 template<int size
, bool big_endian
>
1027 Copy_relocs
<size
, big_endian
>::save(
1031 Output_section
* output_section
,
1032 const elfcpp::Rel
<size
, big_endian
>& rel
)
1034 unsigned int reloc_type
= elfcpp::elf_r_type
<size
>(rel
.get_r_info());
1035 this->entries_
.push_back(Copy_reloc_entry(sym
, reloc_type
, relobj
, shndx
,
1037 rel
.get_r_offset(), 0));
1040 // Save a Rela reloc.
1042 template<int size
, bool big_endian
>
1044 Copy_relocs
<size
, big_endian
>::save(
1048 Output_section
* output_section
,
1049 const elfcpp::Rela
<size
, big_endian
>& rela
)
1051 unsigned int reloc_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
1052 this->entries_
.push_back(Copy_reloc_entry(sym
, reloc_type
, relobj
, shndx
,
1054 rela
.get_r_offset(),
1055 rela
.get_r_addend()));
1058 // Return whether there are any relocs to emit. We don't want to emit
1059 // a reloc if the symbol is no longer defined in a dynamic object.
1061 template<int size
, bool big_endian
>
1063 Copy_relocs
<size
, big_endian
>::any_to_emit()
1065 for (typename
Copy_reloc_entries::iterator p
= this->entries_
.begin();
1066 p
!= this->entries_
.end();
1069 if (p
->should_emit())
1077 template<int size
, bool big_endian
>
1078 template<int sh_type
>
1080 Copy_relocs
<size
, big_endian
>::emit(
1081 Output_data_reloc
<sh_type
, true, size
, big_endian
>* reloc_data
)
1083 for (typename
Copy_reloc_entries::iterator p
= this->entries_
.begin();
1084 p
!= this->entries_
.end();
1087 if (p
->should_emit())
1088 p
->emit(reloc_data
);
1092 // Track_relocs methods.
1094 // Initialize the class to track the relocs. This gets the object,
1095 // the reloc section index, and the type of the relocs. This returns
1096 // false if something goes wrong.
1098 template<int size
, bool big_endian
>
1100 Track_relocs
<size
, big_endian
>::initialize(
1102 unsigned int reloc_shndx
,
1103 unsigned int reloc_type
)
1105 // If RELOC_SHNDX is -1U, it means there is more than one reloc
1106 // section for the .eh_frame section. We can't handle that case.
1107 if (reloc_shndx
== -1U)
1110 // If RELOC_SHNDX is 0, there is no reloc section.
1111 if (reloc_shndx
== 0)
1114 // Get the contents of the reloc section.
1115 this->prelocs_
= object
->section_contents(reloc_shndx
, &this->len_
, false);
1117 if (reloc_type
== elfcpp::SHT_REL
)
1118 this->reloc_size_
= elfcpp::Elf_sizes
<size
>::rel_size
;
1119 else if (reloc_type
== elfcpp::SHT_RELA
)
1120 this->reloc_size_
= elfcpp::Elf_sizes
<size
>::rela_size
;
1124 if (this->len_
% this->reloc_size_
!= 0)
1126 object
->error(_("reloc section size %zu is not a multiple of "
1128 static_cast<size_t>(this->len_
),
1136 // Return the offset of the next reloc, or -1 if there isn't one.
1138 template<int size
, bool big_endian
>
1140 Track_relocs
<size
, big_endian
>::next_offset() const
1142 if (this->pos_
>= this->len_
)
1145 // Rel and Rela start out the same, so we can always use Rel to find
1146 // the r_offset value.
1147 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1148 return rel
.get_r_offset();
1151 // Return the index of the symbol referenced by the next reloc, or -1U
1152 // if there aren't any more relocs.
1154 template<int size
, bool big_endian
>
1156 Track_relocs
<size
, big_endian
>::next_symndx() const
1158 if (this->pos_
>= this->len_
)
1161 // Rel and Rela start out the same, so we can use Rel to find the
1163 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1164 return elfcpp::elf_r_sym
<size
>(rel
.get_r_info());
1167 // Advance to the next reloc whose r_offset is greater than or equal
1168 // to OFFSET. Return the number of relocs we skip.
1170 template<int size
, bool big_endian
>
1172 Track_relocs
<size
, big_endian
>::advance(off_t offset
)
1175 while (this->pos_
< this->len_
)
1177 // Rel and Rela start out the same, so we can always use Rel to
1178 // find the r_offset value.
1179 elfcpp::Rel
<size
, big_endian
> rel(this->prelocs_
+ this->pos_
);
1180 if (static_cast<off_t
>(rel
.get_r_offset()) >= offset
)
1183 this->pos_
+= this->reloc_size_
;
1188 // Instantiate the templates we need. We could use the configure
1189 // script to restrict this to only the ones for implemented targets.
1191 #ifdef HAVE_TARGET_32_LITTLE
1194 Sized_relobj
<32, false>::do_read_relocs(Read_relocs_data
* rd
);
1197 #ifdef HAVE_TARGET_32_BIG
1200 Sized_relobj
<32, true>::do_read_relocs(Read_relocs_data
* rd
);
1203 #ifdef HAVE_TARGET_64_LITTLE
1206 Sized_relobj
<64, false>::do_read_relocs(Read_relocs_data
* rd
);
1209 #ifdef HAVE_TARGET_64_BIG
1212 Sized_relobj
<64, true>::do_read_relocs(Read_relocs_data
* rd
);
1215 #ifdef HAVE_TARGET_32_LITTLE
1218 Sized_relobj
<32, false>::do_scan_relocs(const General_options
& options
,
1219 Symbol_table
* symtab
,
1221 Read_relocs_data
* rd
);
1224 #ifdef HAVE_TARGET_32_BIG
1227 Sized_relobj
<32, true>::do_scan_relocs(const General_options
& options
,
1228 Symbol_table
* symtab
,
1230 Read_relocs_data
* rd
);
1233 #ifdef HAVE_TARGET_64_LITTLE
1236 Sized_relobj
<64, false>::do_scan_relocs(const General_options
& options
,
1237 Symbol_table
* symtab
,
1239 Read_relocs_data
* rd
);
1242 #ifdef HAVE_TARGET_64_BIG
1245 Sized_relobj
<64, true>::do_scan_relocs(const General_options
& options
,
1246 Symbol_table
* symtab
,
1248 Read_relocs_data
* rd
);
1251 #ifdef HAVE_TARGET_32_LITTLE
1254 Sized_relobj
<32, false>::do_relocate(const General_options
& options
,
1255 const Symbol_table
* symtab
,
1256 const Layout
* layout
,
1260 #ifdef HAVE_TARGET_32_BIG
1263 Sized_relobj
<32, true>::do_relocate(const General_options
& options
,
1264 const Symbol_table
* symtab
,
1265 const Layout
* layout
,
1269 #ifdef HAVE_TARGET_64_LITTLE
1272 Sized_relobj
<64, false>::do_relocate(const General_options
& options
,
1273 const Symbol_table
* symtab
,
1274 const Layout
* layout
,
1278 #ifdef HAVE_TARGET_64_BIG
1281 Sized_relobj
<64, true>::do_relocate(const General_options
& options
,
1282 const Symbol_table
* symtab
,
1283 const Layout
* layout
,
1287 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1289 class Merged_symbol_value
<32>;
1292 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1294 class Merged_symbol_value
<64>;
1297 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1299 class Symbol_value
<32>;
1302 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1304 class Symbol_value
<64>;
1307 #ifdef HAVE_TARGET_32_LITTLE
1309 class Copy_relocs
<32, false>;
1312 #ifdef HAVE_TARGET_32_BIG
1314 class Copy_relocs
<32, true>;
1317 #ifdef HAVE_TARGET_64_LITTLE
1319 class Copy_relocs
<64, false>;
1322 #ifdef HAVE_TARGET_64_BIG
1324 class Copy_relocs
<64, true>;
1327 #ifdef HAVE_TARGET_32_LITTLE
1330 Copy_relocs
<32, false>::emit
<elfcpp::SHT_REL
>(
1331 Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false>*);
1334 #ifdef HAVE_TARGET_32_BIG
1337 Copy_relocs
<32, true>::emit
<elfcpp::SHT_REL
>(
1338 Output_data_reloc
<elfcpp::SHT_REL
, true, 32, true>*);
1341 #ifdef HAVE_TARGET_64_LITTLE
1344 Copy_relocs
<64, false>::emit
<elfcpp::SHT_REL
>(
1345 Output_data_reloc
<elfcpp::SHT_REL
, true, 64, false>*);
1348 #ifdef HAVE_TARGET_64_BIG
1351 Copy_relocs
<64, true>::emit
<elfcpp::SHT_REL
>(
1352 Output_data_reloc
<elfcpp::SHT_REL
, true, 64, true>*);
1355 #ifdef HAVE_TARGET_32_LITTLE
1358 Copy_relocs
<32, false>::emit
<elfcpp::SHT_RELA
>(
1359 Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, false>*);
1362 #ifdef HAVE_TARGET_32_BIG
1365 Copy_relocs
<32, true>::emit
<elfcpp::SHT_RELA
>(
1366 Output_data_reloc
<elfcpp::SHT_RELA
, true, 32, true>*);
1369 #ifdef HAVE_TARGET_64_LITTLE
1372 Copy_relocs
<64, false>::emit
<elfcpp::SHT_RELA
>(
1373 Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false>*);
1376 #ifdef HAVE_TARGET_64_BIG
1379 Copy_relocs
<64, true>::emit
<elfcpp::SHT_RELA
>(
1380 Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, true>*);
1383 #ifdef HAVE_TARGET_32_LITTLE
1385 class Track_relocs
<32, false>;
1388 #ifdef HAVE_TARGET_32_BIG
1390 class Track_relocs
<32, true>;
1393 #ifdef HAVE_TARGET_64_LITTLE
1395 class Track_relocs
<64, false>;
1398 #ifdef HAVE_TARGET_64_BIG
1400 class Track_relocs
<64, true>;
1403 } // End namespace gold.