1 // target-reloc.h -- target specific relocation support -*- C++ -*-
3 // Copyright (C) 2006-2015 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.
23 #ifndef GOLD_TARGET_RELOC_H
24 #define GOLD_TARGET_RELOC_H
30 #include "reloc-types.h"
35 // This function implements the generic part of reloc scanning. The
36 // template parameter Scan must be a class type which provides two
37 // functions: local() and global(). Those functions implement the
38 // machine specific part of scanning. We do it this way to
39 // avoid making a function call for each relocation, and to avoid
40 // repeating the generic code for each target.
42 template<int size
, bool big_endian
, typename Target_type
, int sh_type
,
49 Sized_relobj_file
<size
, big_endian
>* object
,
50 unsigned int data_shndx
,
51 const unsigned char* prelocs
,
53 Output_section
* output_section
,
54 bool needs_special_offset_handling
,
56 const unsigned char* plocal_syms
)
58 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
59 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
60 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
63 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
65 Reltype
reloc(prelocs
);
67 if (needs_special_offset_handling
68 && !output_section
->is_input_address_mapped(object
, data_shndx
,
69 reloc
.get_r_offset()))
72 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
73 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
74 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
76 if (r_sym
< local_count
)
78 gold_assert(plocal_syms
!= NULL
);
79 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
81 unsigned int shndx
= lsym
.get_st_shndx();
83 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
84 // If RELOC is a relocation against a local symbol in a
85 // section we are discarding then we can ignore it. It will
86 // eventually become a reloc against the value zero.
88 // FIXME: We should issue a warning if this is an
89 // allocated section; is this the best place to do it?
91 // FIXME: The old GNU linker would in some cases look
92 // for the linkonce section which caused this section to
93 // be discarded, and, if the other section was the same
94 // size, change the reloc to refer to the other section.
95 // That seems risky and weird to me, and I don't know of
96 // any case where it is actually required.
97 bool is_discarded
= (is_ordinary
98 && shndx
!= elfcpp::SHN_UNDEF
99 && !object
->is_section_included(shndx
)
100 && !symtab
->is_section_folded(object
, shndx
));
101 scan
.local(symtab
, layout
, target
, object
, data_shndx
,
102 output_section
, reloc
, r_type
, lsym
, is_discarded
);
106 Symbol
* gsym
= object
->global_symbol(r_sym
);
107 gold_assert(gsym
!= NULL
);
108 if (gsym
->is_forwarder())
109 gsym
= symtab
->resolve_forwards(gsym
);
111 scan
.global(symtab
, layout
, target
, object
, data_shndx
,
112 output_section
, reloc
, r_type
, gsym
);
117 // Behavior for relocations to discarded comdat sections.
121 CB_UNDETERMINED
, // Not yet determined -- need to look at section name.
122 CB_PRETEND
, // Attempt to map to the corresponding kept section.
123 CB_IGNORE
, // Ignore the relocation.
124 CB_WARNING
// Print a warning.
127 class Default_comdat_behavior
130 // Decide what the linker should do for relocations that refer to
131 // discarded comdat sections. This decision is based on the name of
132 // the section being relocated.
134 inline Comdat_behavior
135 get(const char* name
)
137 if (Layout::is_debug_info_section(name
))
139 if (strcmp(name
, ".eh_frame") == 0
140 || strcmp(name
, ".gcc_except_table") == 0)
146 // Give an error for a symbol with non-default visibility which is not
150 visibility_error(const Symbol
* sym
)
153 switch (sym
->visibility())
155 case elfcpp::STV_INTERNAL
:
158 case elfcpp::STV_HIDDEN
:
161 case elfcpp::STV_PROTECTED
:
167 gold_error(_("%s symbol '%s' is not defined locally"),
171 // Return true if we are should issue an error saying that SYM is an
172 // undefined symbol. This is called if there is a relocation against
176 issue_undefined_symbol_error(const Symbol
* sym
)
178 // We only report global symbols.
182 // We only report undefined symbols.
183 if (!sym
->is_undefined() && !sym
->is_placeholder())
186 // We don't report weak symbols.
187 if (sym
->is_weak_undefined())
190 // We don't report symbols defined in discarded sections.
191 if (sym
->is_defined_in_discarded_section())
194 // If the target defines this symbol, don't report it here.
195 if (parameters
->target().is_defined_by_abi(sym
))
198 // See if we've been told to ignore whether this symbol is
200 const char* const u
= parameters
->options().unresolved_symbols();
203 if (strcmp(u
, "ignore-all") == 0)
205 if (strcmp(u
, "report-all") == 0)
207 if (strcmp(u
, "ignore-in-object-files") == 0 && !sym
->in_dyn())
209 if (strcmp(u
, "ignore-in-shared-libs") == 0 && !sym
->in_reg())
213 // If the symbol is hidden, report it.
214 if (sym
->visibility() == elfcpp::STV_HIDDEN
)
217 // When creating a shared library, only report unresolved symbols if
219 if (parameters
->options().shared() && !parameters
->options().defs())
222 // Otherwise issue a warning.
226 // This function implements the generic part of relocation processing.
227 // The template parameter Relocate must be a class type which provides
228 // a single function, relocate(), which implements the machine
229 // specific part of a relocation.
231 // The template parameter Relocate_comdat_behavior is a class type
232 // which provides a single function, get(), which determines what the
233 // linker should do for relocations that refer to discarded comdat
236 // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
237 // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
238 // RELOCATE implements operator() to do a relocation.
240 // PRELOCS points to the relocation data. RELOC_COUNT is the number
241 // of relocs. OUTPUT_SECTION is the output section.
242 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
243 // mapped to output offsets.
245 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
246 // VIEW_SIZE is the size. These refer to the input section, unless
247 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
248 // the output section.
250 // RELOC_SYMBOL_CHANGES is used for -fsplit-stack support. If it is
251 // not NULL, it is a vector indexed by relocation index. If that
252 // entry is not NULL, it points to a global symbol which used as the
253 // symbol for the relocation, ignoring the symbol index in the
256 template<int size
, bool big_endian
, typename Target_type
, int sh_type
,
258 typename Relocate_comdat_behavior
>
261 const Relocate_info
<size
, big_endian
>* relinfo
,
263 const unsigned char* prelocs
,
265 Output_section
* output_section
,
266 bool needs_special_offset_handling
,
268 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
269 section_size_type view_size
,
270 const Reloc_symbol_changes
* reloc_symbol_changes
)
272 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
273 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
275 Relocate_comdat_behavior relocate_comdat_behavior
;
277 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
278 unsigned int local_count
= object
->local_symbol_count();
280 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
282 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
284 Reltype
reloc(prelocs
);
286 section_offset_type offset
=
287 convert_to_section_size_type(reloc
.get_r_offset());
289 if (needs_special_offset_handling
)
291 offset
= output_section
->output_offset(relinfo
->object
,
298 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
299 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
300 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
302 const Sized_symbol
<size
>* sym
;
304 Symbol_value
<size
> symval
;
305 const Symbol_value
<size
> *psymval
;
306 bool is_defined_in_discarded_section
;
308 if (r_sym
< local_count
309 && (reloc_symbol_changes
== NULL
310 || (*reloc_symbol_changes
)[i
] == NULL
))
313 psymval
= object
->local_symbol(r_sym
);
315 // If the local symbol belongs to a section we are discarding,
316 // and that section is a debug section, try to find the
317 // corresponding kept section and map this symbol to its
318 // counterpart in the kept section. The symbol must not
319 // correspond to a section we are folding.
321 shndx
= psymval
->input_shndx(&is_ordinary
);
322 is_defined_in_discarded_section
=
324 && shndx
!= elfcpp::SHN_UNDEF
325 && !object
->is_section_included(shndx
)
326 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
331 if (reloc_symbol_changes
!= NULL
332 && (*reloc_symbol_changes
)[i
] != NULL
)
333 gsym
= (*reloc_symbol_changes
)[i
];
336 gsym
= object
->global_symbol(r_sym
);
337 gold_assert(gsym
!= NULL
);
338 if (gsym
->is_forwarder())
339 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
342 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
343 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
344 symval
.set_output_symtab_index(sym
->symtab_index());
346 symval
.set_no_output_symtab_entry();
347 symval
.set_output_value(sym
->value());
348 if (gsym
->type() == elfcpp::STT_TLS
)
349 symval
.set_is_tls_symbol();
350 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
351 symval
.set_is_ifunc_symbol();
354 is_defined_in_discarded_section
=
355 (gsym
->is_defined_in_discarded_section()
356 && gsym
->is_undefined());
360 Symbol_value
<size
> symval2
;
361 if (is_defined_in_discarded_section
)
363 if (comdat_behavior
== CB_UNDETERMINED
)
365 std::string name
= object
->section_name(relinfo
->data_shndx
);
366 comdat_behavior
= relocate_comdat_behavior
.get(name
.c_str());
368 if (comdat_behavior
== CB_PRETEND
)
370 // FIXME: This case does not work for global symbols.
371 // We have no place to store the original section index.
372 // Fortunately this does not matter for comdat sections,
373 // only for sections explicitly discarded by a linker
376 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
377 object
->map_to_kept_section(shndx
, &found
);
379 symval2
.set_output_value(value
+ psymval
->input_value());
381 symval2
.set_output_value(0);
385 if (comdat_behavior
== CB_WARNING
)
386 gold_warning_at_location(relinfo
, i
, offset
,
387 _("relocation refers to discarded "
389 symval2
.set_output_value(0);
391 symval2
.set_no_output_symtab_entry();
395 // If OFFSET is out of range, still let the target decide to
396 // ignore the relocation. Pass in NULL as the VIEW argument so
397 // that it can return quickly without trashing an invalid memory
399 unsigned char *v
= view
+ offset
;
400 if (offset
< 0 || static_cast<section_size_type
>(offset
) >= view_size
)
403 if (!relocate
.relocate(relinfo
, target
, output_section
, i
, reloc
,
404 r_type
, sym
, psymval
, v
, view_address
+ offset
,
410 gold_error_at_location(relinfo
, i
, offset
,
411 _("reloc has bad offset %zu"),
412 static_cast<size_t>(offset
));
416 if (issue_undefined_symbol_error(sym
))
417 gold_undefined_symbol_at_location(sym
, relinfo
, i
, offset
);
419 && sym
->visibility() != elfcpp::STV_DEFAULT
420 && (sym
->is_strong_undefined() || sym
->is_from_dynobj()))
421 visibility_error(sym
);
423 if (sym
!= NULL
&& sym
->has_warning())
424 relinfo
->symtab
->issue_warning(sym
, relinfo
, i
, offset
);
428 // Apply an incremental relocation.
430 template<int size
, bool big_endian
, typename Target_type
,
433 apply_relocation(const Relocate_info
<size
, big_endian
>* relinfo
,
435 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
437 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
440 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
441 section_size_type view_size
)
443 // Construct the ELF relocation in a temporary buffer.
444 const int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
445 unsigned char relbuf
[reloc_size
];
446 elfcpp::Rela
<size
, big_endian
> rel(relbuf
);
447 elfcpp::Rela_write
<size
, big_endian
> orel(relbuf
);
448 orel
.put_r_offset(r_offset
);
449 orel
.put_r_info(elfcpp::elf_r_info
<size
>(0, r_type
));
450 orel
.put_r_addend(r_addend
);
452 // Setup a Symbol_value for the global symbol.
453 const Sized_symbol
<size
>* sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
454 Symbol_value
<size
> symval
;
455 gold_assert(sym
->has_symtab_index() && sym
->symtab_index() != -1U);
456 symval
.set_output_symtab_index(sym
->symtab_index());
457 symval
.set_output_value(sym
->value());
458 if (gsym
->type() == elfcpp::STT_TLS
)
459 symval
.set_is_tls_symbol();
460 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
461 symval
.set_is_ifunc_symbol();
464 relocate
.relocate(relinfo
, target
, NULL
, -1U, rel
, r_type
, sym
, &symval
,
465 view
+ r_offset
, address
+ r_offset
, view_size
);
468 // This class may be used as a typical class for the
469 // Scan_relocatable_reloc parameter to scan_relocatable_relocs. The
470 // template parameter Classify_reloc must be a class type which
471 // provides a function get_size_for_reloc which returns the number of
472 // bytes to which a reloc applies. This class is intended to capture
473 // the most typical target behaviour, while still permitting targets
474 // to define their own independent class for Scan_relocatable_reloc.
476 template<int sh_type
, typename Classify_reloc
>
477 class Default_scan_relocatable_relocs
480 // Return the strategy to use for a local symbol which is not a
481 // section symbol, given the relocation type.
482 inline Relocatable_relocs::Reloc_strategy
483 local_non_section_strategy(unsigned int r_type
, Relobj
*, unsigned int r_sym
)
485 // We assume that relocation type 0 is NONE. Targets which are
486 // different must override.
487 if (r_type
== 0 && r_sym
== 0)
488 return Relocatable_relocs::RELOC_DISCARD
;
489 return Relocatable_relocs::RELOC_COPY
;
492 // Return the strategy to use for a local symbol which is a section
493 // symbol, given the relocation type.
494 inline Relocatable_relocs::Reloc_strategy
495 local_section_strategy(unsigned int r_type
, Relobj
* object
)
497 if (sh_type
== elfcpp::SHT_RELA
)
498 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
;
501 Classify_reloc classify
;
502 switch (classify
.get_size_for_reloc(r_type
, object
))
505 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
;
507 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
;
509 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
;
511 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
;
513 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
;
520 // Return the strategy to use for a global symbol, given the
521 // relocation type, the object, and the symbol index.
522 inline Relocatable_relocs::Reloc_strategy
523 global_strategy(unsigned int, Relobj
*, unsigned int)
524 { return Relocatable_relocs::RELOC_COPY
; }
527 // Scan relocs during a relocatable link. This is a default
528 // definition which should work for most targets.
529 // Scan_relocatable_reloc must name a class type which provides three
530 // functions which return a Relocatable_relocs::Reloc_strategy code:
531 // global_strategy, local_non_section_strategy, and
532 // local_section_strategy. Most targets should be able to use
533 // Default_scan_relocatable_relocs as this class.
535 template<int size
, bool big_endian
, int sh_type
,
536 typename Scan_relocatable_reloc
>
538 scan_relocatable_relocs(
541 Sized_relobj_file
<size
, big_endian
>* object
,
542 unsigned int data_shndx
,
543 const unsigned char* prelocs
,
545 Output_section
* output_section
,
546 bool needs_special_offset_handling
,
547 size_t local_symbol_count
,
548 const unsigned char* plocal_syms
,
549 Relocatable_relocs
* rr
)
551 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
552 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
553 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
554 Scan_relocatable_reloc scan
;
556 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
558 Reltype
reloc(prelocs
);
560 Relocatable_relocs::Reloc_strategy strategy
;
562 if (needs_special_offset_handling
563 && !output_section
->is_input_address_mapped(object
, data_shndx
,
564 reloc
.get_r_offset()))
565 strategy
= Relocatable_relocs::RELOC_DISCARD
;
568 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
=
570 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
571 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
573 if (r_sym
>= local_symbol_count
)
574 strategy
= scan
.global_strategy(r_type
, object
, r_sym
);
577 gold_assert(plocal_syms
!= NULL
);
578 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
580 unsigned int shndx
= lsym
.get_st_shndx();
582 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
584 && shndx
!= elfcpp::SHN_UNDEF
585 && !object
->is_section_included(shndx
))
587 // RELOC is a relocation against a local symbol
588 // defined in a section we are discarding. Discard
589 // the reloc. FIXME: Should we issue a warning?
590 strategy
= Relocatable_relocs::RELOC_DISCARD
;
592 else if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
593 strategy
= scan
.local_non_section_strategy(r_type
, object
,
597 strategy
= scan
.local_section_strategy(r_type
, object
);
598 if (strategy
!= Relocatable_relocs::RELOC_DISCARD
)
599 object
->output_section(shndx
)->set_needs_symtab_index();
602 if (strategy
== Relocatable_relocs::RELOC_COPY
)
603 object
->set_must_have_output_symtab_entry(r_sym
);
607 rr
->set_next_reloc_strategy(strategy
);
611 // Relocate relocs. Called for a relocatable link, and for --emit-relocs.
612 // This is a default definition which should work for most targets.
614 template<int size
, bool big_endian
, int sh_type
>
617 const Relocate_info
<size
, big_endian
>* relinfo
,
618 const unsigned char* prelocs
,
620 Output_section
* output_section
,
621 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
622 const Relocatable_relocs
* rr
,
624 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
625 section_size_type view_size
,
626 unsigned char* reloc_view
,
627 section_size_type reloc_view_size
)
629 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
630 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
631 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc_write
633 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
634 const Address invalid_address
= static_cast<Address
>(0) - 1;
636 Sized_relobj_file
<size
, big_endian
>* const object
= relinfo
->object
;
637 const unsigned int local_count
= object
->local_symbol_count();
639 unsigned char* pwrite
= reloc_view
;
641 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
643 Relocatable_relocs::Reloc_strategy strategy
= rr
->strategy(i
);
644 if (strategy
== Relocatable_relocs::RELOC_DISCARD
)
647 if (strategy
== Relocatable_relocs::RELOC_SPECIAL
)
649 // Target wants to handle this relocation.
650 Sized_target
<size
, big_endian
>* target
=
651 parameters
->sized_target
<size
, big_endian
>();
652 target
->relocate_special_relocatable(relinfo
, sh_type
, prelocs
,
654 offset_in_output_section
,
657 pwrite
+= reloc_size
;
660 Reltype
reloc(prelocs
);
661 Reltype_write
reloc_write(pwrite
);
663 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
664 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
665 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
667 // Get the new symbol index.
669 unsigned int new_symndx
;
670 if (r_sym
< local_count
)
674 case Relocatable_relocs::RELOC_COPY
:
679 new_symndx
= object
->symtab_index(r_sym
);
680 gold_assert(new_symndx
!= -1U);
684 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
685 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
686 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
687 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
688 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
689 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
690 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
692 // We are adjusting a section symbol. We need to find
693 // the symbol table index of the section symbol for
694 // the output section corresponding to input section
695 // in which this symbol is defined.
696 gold_assert(r_sym
< local_count
);
699 object
->local_symbol_input_shndx(r_sym
, &is_ordinary
);
700 gold_assert(is_ordinary
);
701 Output_section
* os
= object
->output_section(shndx
);
702 gold_assert(os
!= NULL
);
703 gold_assert(os
->needs_symtab_index());
704 new_symndx
= os
->symtab_index();
714 const Symbol
* gsym
= object
->global_symbol(r_sym
);
715 gold_assert(gsym
!= NULL
);
716 if (gsym
->is_forwarder())
717 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
719 gold_assert(gsym
->has_symtab_index());
720 new_symndx
= gsym
->symtab_index();
723 // Get the new offset--the location in the output section where
724 // this relocation should be applied.
726 Address offset
= reloc
.get_r_offset();
728 if (offset_in_output_section
!= invalid_address
)
729 new_offset
= offset
+ offset_in_output_section
;
732 section_offset_type sot_offset
=
733 convert_types
<section_offset_type
, Address
>(offset
);
734 section_offset_type new_sot_offset
=
735 output_section
->output_offset(object
, relinfo
->data_shndx
,
737 gold_assert(new_sot_offset
!= -1);
738 new_offset
= new_sot_offset
;
741 // In an object file, r_offset is an offset within the section.
742 // In an executable or dynamic object, generated by
743 // --emit-relocs, r_offset is an absolute address.
744 if (!parameters
->options().relocatable())
746 new_offset
+= view_address
;
747 if (offset_in_output_section
!= invalid_address
)
748 new_offset
-= offset_in_output_section
;
751 reloc_write
.put_r_offset(new_offset
);
752 reloc_write
.put_r_info(elfcpp::elf_r_info
<size
>(new_symndx
, r_type
));
754 // Handle the reloc addend based on the strategy.
756 if (strategy
== Relocatable_relocs::RELOC_COPY
)
758 if (sh_type
== elfcpp::SHT_RELA
)
759 Reloc_types
<sh_type
, size
, big_endian
>::
760 copy_reloc_addend(&reloc_write
,
765 // The relocation uses a section symbol in the input file.
766 // We are adjusting it to use a section symbol in the output
767 // file. The input section symbol refers to some address in
768 // the input section. We need the relocation in the output
769 // file to refer to that same address. This adjustment to
770 // the addend is the same calculation we use for a simple
771 // absolute relocation for the input section symbol.
773 const Symbol_value
<size
>* psymval
= object
->local_symbol(r_sym
);
775 unsigned char* padd
= view
+ offset
;
778 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
780 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
;
781 addend
= Reloc_types
<sh_type
, size
, big_endian
>::
782 get_reloc_addend(&reloc
);
783 addend
= psymval
->value(object
, addend
);
784 Reloc_types
<sh_type
, size
, big_endian
>::
785 set_reloc_addend(&reloc_write
, addend
);
789 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
792 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
793 Relocate_functions
<size
, big_endian
>::rel8(padd
, object
,
797 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
798 Relocate_functions
<size
, big_endian
>::rel16(padd
, object
,
802 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
803 Relocate_functions
<size
, big_endian
>::rel32(padd
, object
,
807 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
808 Relocate_functions
<size
, big_endian
>::rel64(padd
, object
,
812 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
813 Relocate_functions
<size
, big_endian
>::rel32_unaligned(padd
,
823 pwrite
+= reloc_size
;
826 gold_assert(static_cast<section_size_type
>(pwrite
- reloc_view
)
830 } // End namespace gold.
832 #endif // !defined(GOLD_TARGET_RELOC_H)