1 // target-reloc.h -- target specific relocation support -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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
->binding() == elfcpp::STB_WEAK
)
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 // When creating a shared library, only report unresolved symbols if
215 if (parameters
->options().shared() && !parameters
->options().defs())
218 // Otherwise issue a warning.
222 // This function implements the generic part of relocation processing.
223 // The template parameter Relocate must be a class type which provides
224 // a single function, relocate(), which implements the machine
225 // specific part of a relocation.
227 // The template parameter Relocate_comdat_behavior is a class type
228 // which provides a single function, get(), which determines what the
229 // linker should do for relocations that refer to discarded comdat
232 // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
233 // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
234 // RELOCATE implements operator() to do a relocation.
236 // PRELOCS points to the relocation data. RELOC_COUNT is the number
237 // of relocs. OUTPUT_SECTION is the output section.
238 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
239 // mapped to output offsets.
241 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
242 // VIEW_SIZE is the size. These refer to the input section, unless
243 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
244 // the output section.
246 // RELOC_SYMBOL_CHANGES is used for -fsplit-stack support. If it is
247 // not NULL, it is a vector indexed by relocation index. If that
248 // entry is not NULL, it points to a global symbol which used as the
249 // symbol for the relocation, ignoring the symbol index in the
252 template<int size
, bool big_endian
, typename Target_type
, int sh_type
,
254 typename Relocate_comdat_behavior
>
257 const Relocate_info
<size
, big_endian
>* relinfo
,
259 const unsigned char* prelocs
,
261 Output_section
* output_section
,
262 bool needs_special_offset_handling
,
264 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
265 section_size_type view_size
,
266 const Reloc_symbol_changes
* reloc_symbol_changes
)
268 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
269 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
271 Relocate_comdat_behavior relocate_comdat_behavior
;
273 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
274 unsigned int local_count
= object
->local_symbol_count();
276 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
278 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
280 Reltype
reloc(prelocs
);
282 section_offset_type offset
=
283 convert_to_section_size_type(reloc
.get_r_offset());
285 if (needs_special_offset_handling
)
287 offset
= output_section
->output_offset(relinfo
->object
,
294 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
295 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
296 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
298 const Sized_symbol
<size
>* sym
;
300 Symbol_value
<size
> symval
;
301 const Symbol_value
<size
> *psymval
;
302 bool is_defined_in_discarded_section
;
304 if (r_sym
< local_count
305 && (reloc_symbol_changes
== NULL
306 || (*reloc_symbol_changes
)[i
] == NULL
))
309 psymval
= object
->local_symbol(r_sym
);
311 // If the local symbol belongs to a section we are discarding,
312 // and that section is a debug section, try to find the
313 // corresponding kept section and map this symbol to its
314 // counterpart in the kept section. The symbol must not
315 // correspond to a section we are folding.
317 shndx
= psymval
->input_shndx(&is_ordinary
);
318 is_defined_in_discarded_section
=
320 && shndx
!= elfcpp::SHN_UNDEF
321 && !object
->is_section_included(shndx
)
322 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
327 if (reloc_symbol_changes
!= NULL
328 && (*reloc_symbol_changes
)[i
] != NULL
)
329 gsym
= (*reloc_symbol_changes
)[i
];
332 gsym
= object
->global_symbol(r_sym
);
333 gold_assert(gsym
!= NULL
);
334 if (gsym
->is_forwarder())
335 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
338 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
339 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
340 symval
.set_output_symtab_index(sym
->symtab_index());
342 symval
.set_no_output_symtab_entry();
343 symval
.set_output_value(sym
->value());
344 if (gsym
->type() == elfcpp::STT_TLS
)
345 symval
.set_is_tls_symbol();
346 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
347 symval
.set_is_ifunc_symbol();
350 is_defined_in_discarded_section
=
351 (gsym
->is_defined_in_discarded_section()
352 && gsym
->is_undefined());
356 Symbol_value
<size
> symval2
;
357 if (is_defined_in_discarded_section
)
359 if (comdat_behavior
== CB_UNDETERMINED
)
361 std::string name
= object
->section_name(relinfo
->data_shndx
);
362 comdat_behavior
= relocate_comdat_behavior
.get(name
.c_str());
364 if (comdat_behavior
== CB_PRETEND
)
366 // FIXME: This case does not work for global symbols.
367 // We have no place to store the original section index.
368 // Fortunately this does not matter for comdat sections,
369 // only for sections explicitly discarded by a linker
372 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
373 object
->map_to_kept_section(shndx
, &found
);
375 symval2
.set_output_value(value
+ psymval
->input_value());
377 symval2
.set_output_value(0);
381 if (comdat_behavior
== CB_WARNING
)
382 gold_warning_at_location(relinfo
, i
, offset
,
383 _("relocation refers to discarded "
385 symval2
.set_output_value(0);
387 symval2
.set_no_output_symtab_entry();
391 if (!relocate
.relocate(relinfo
, target
, output_section
, i
, reloc
,
392 r_type
, sym
, psymval
, view
+ offset
,
393 view_address
+ offset
, view_size
))
396 if (offset
< 0 || static_cast<section_size_type
>(offset
) >= view_size
)
398 gold_error_at_location(relinfo
, i
, offset
,
399 _("reloc has bad offset %zu"),
400 static_cast<size_t>(offset
));
404 if (issue_undefined_symbol_error(sym
))
405 gold_undefined_symbol_at_location(sym
, relinfo
, i
, offset
);
407 && sym
->visibility() != elfcpp::STV_DEFAULT
408 && (sym
->is_undefined() || sym
->is_from_dynobj()))
409 visibility_error(sym
);
411 if (sym
!= NULL
&& sym
->has_warning())
412 relinfo
->symtab
->issue_warning(sym
, relinfo
, i
, offset
);
416 // Apply an incremental relocation.
418 template<int size
, bool big_endian
, typename Target_type
,
421 apply_relocation(const Relocate_info
<size
, big_endian
>* relinfo
,
423 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
425 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
428 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
429 section_size_type view_size
)
431 // Construct the ELF relocation in a temporary buffer.
432 const int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
433 unsigned char relbuf
[reloc_size
];
434 elfcpp::Rela
<size
, big_endian
> rel(relbuf
);
435 elfcpp::Rela_write
<size
, big_endian
> orel(relbuf
);
436 orel
.put_r_offset(r_offset
);
437 orel
.put_r_info(elfcpp::elf_r_info
<size
>(0, r_type
));
438 orel
.put_r_addend(r_addend
);
440 // Setup a Symbol_value for the global symbol.
441 const Sized_symbol
<size
>* sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
442 Symbol_value
<size
> symval
;
443 gold_assert(sym
->has_symtab_index() && sym
->symtab_index() != -1U);
444 symval
.set_output_symtab_index(sym
->symtab_index());
445 symval
.set_output_value(sym
->value());
446 if (gsym
->type() == elfcpp::STT_TLS
)
447 symval
.set_is_tls_symbol();
448 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
449 symval
.set_is_ifunc_symbol();
452 relocate
.relocate(relinfo
, target
, NULL
, -1U, rel
, r_type
, sym
, &symval
,
453 view
+ r_offset
, address
+ r_offset
, view_size
);
456 // This class may be used as a typical class for the
457 // Scan_relocatable_reloc parameter to scan_relocatable_relocs. The
458 // template parameter Classify_reloc must be a class type which
459 // provides a function get_size_for_reloc which returns the number of
460 // bytes to which a reloc applies. This class is intended to capture
461 // the most typical target behaviour, while still permitting targets
462 // to define their own independent class for Scan_relocatable_reloc.
464 template<int sh_type
, typename Classify_reloc
>
465 class Default_scan_relocatable_relocs
468 // Return the strategy to use for a local symbol which is not a
469 // section symbol, given the relocation type.
470 inline Relocatable_relocs::Reloc_strategy
471 local_non_section_strategy(unsigned int r_type
, Relobj
*, unsigned int r_sym
)
473 // We assume that relocation type 0 is NONE. Targets which are
474 // different must override.
475 if (r_type
== 0 && r_sym
== 0)
476 return Relocatable_relocs::RELOC_DISCARD
;
477 return Relocatable_relocs::RELOC_COPY
;
480 // Return the strategy to use for a local symbol which is a section
481 // symbol, given the relocation type.
482 inline Relocatable_relocs::Reloc_strategy
483 local_section_strategy(unsigned int r_type
, Relobj
* object
)
485 if (sh_type
== elfcpp::SHT_RELA
)
486 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
;
489 Classify_reloc classify
;
490 switch (classify
.get_size_for_reloc(r_type
, object
))
493 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
;
495 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
;
497 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
;
499 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
;
501 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
;
508 // Return the strategy to use for a global symbol, given the
509 // relocation type, the object, and the symbol index.
510 inline Relocatable_relocs::Reloc_strategy
511 global_strategy(unsigned int, Relobj
*, unsigned int)
512 { return Relocatable_relocs::RELOC_COPY
; }
515 // Scan relocs during a relocatable link. This is a default
516 // definition which should work for most targets.
517 // Scan_relocatable_reloc must name a class type which provides three
518 // functions which return a Relocatable_relocs::Reloc_strategy code:
519 // global_strategy, local_non_section_strategy, and
520 // local_section_strategy. Most targets should be able to use
521 // Default_scan_relocatable_relocs as this class.
523 template<int size
, bool big_endian
, int sh_type
,
524 typename Scan_relocatable_reloc
>
526 scan_relocatable_relocs(
529 Sized_relobj_file
<size
, big_endian
>* object
,
530 unsigned int data_shndx
,
531 const unsigned char* prelocs
,
533 Output_section
* output_section
,
534 bool needs_special_offset_handling
,
535 size_t local_symbol_count
,
536 const unsigned char* plocal_syms
,
537 Relocatable_relocs
* rr
)
539 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
540 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
541 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
542 Scan_relocatable_reloc scan
;
544 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
546 Reltype
reloc(prelocs
);
548 Relocatable_relocs::Reloc_strategy strategy
;
550 if (needs_special_offset_handling
551 && !output_section
->is_input_address_mapped(object
, data_shndx
,
552 reloc
.get_r_offset()))
553 strategy
= Relocatable_relocs::RELOC_DISCARD
;
556 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
=
558 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
559 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
561 if (r_sym
>= local_symbol_count
)
562 strategy
= scan
.global_strategy(r_type
, object
, r_sym
);
565 gold_assert(plocal_syms
!= NULL
);
566 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
568 unsigned int shndx
= lsym
.get_st_shndx();
570 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
572 && shndx
!= elfcpp::SHN_UNDEF
573 && !object
->is_section_included(shndx
))
575 // RELOC is a relocation against a local symbol
576 // defined in a section we are discarding. Discard
577 // the reloc. FIXME: Should we issue a warning?
578 strategy
= Relocatable_relocs::RELOC_DISCARD
;
580 else if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
581 strategy
= scan
.local_non_section_strategy(r_type
, object
,
585 strategy
= scan
.local_section_strategy(r_type
, object
);
586 if (strategy
!= Relocatable_relocs::RELOC_DISCARD
)
587 object
->output_section(shndx
)->set_needs_symtab_index();
590 if (strategy
== Relocatable_relocs::RELOC_COPY
)
591 object
->set_must_have_output_symtab_entry(r_sym
);
595 rr
->set_next_reloc_strategy(strategy
);
599 // Relocate relocs. Called for a relocatable link, and for --emit-relocs.
600 // This is a default definition which should work for most targets.
602 template<int size
, bool big_endian
, int sh_type
>
605 const Relocate_info
<size
, big_endian
>* relinfo
,
606 const unsigned char* prelocs
,
608 Output_section
* output_section
,
609 typename
elfcpp::Elf_types
<size
>::Elf_Addr offset_in_output_section
,
610 const Relocatable_relocs
* rr
,
612 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
613 section_size_type view_size
,
614 unsigned char* reloc_view
,
615 section_size_type reloc_view_size
)
617 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
618 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
619 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc_write
621 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
622 const Address invalid_address
= static_cast<Address
>(0) - 1;
624 Sized_relobj_file
<size
, big_endian
>* const object
= relinfo
->object
;
625 const unsigned int local_count
= object
->local_symbol_count();
627 unsigned char* pwrite
= reloc_view
;
629 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
631 Relocatable_relocs::Reloc_strategy strategy
= rr
->strategy(i
);
632 if (strategy
== Relocatable_relocs::RELOC_DISCARD
)
635 if (strategy
== Relocatable_relocs::RELOC_SPECIAL
)
637 // Target wants to handle this relocation.
638 Sized_target
<size
, big_endian
>* target
=
639 parameters
->sized_target
<size
, big_endian
>();
640 target
->relocate_special_relocatable(relinfo
, sh_type
, prelocs
,
642 offset_in_output_section
,
645 pwrite
+= reloc_size
;
648 Reltype
reloc(prelocs
);
649 Reltype_write
reloc_write(pwrite
);
651 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
652 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
653 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
655 // Get the new symbol index.
657 unsigned int new_symndx
;
658 if (r_sym
< local_count
)
662 case Relocatable_relocs::RELOC_COPY
:
667 new_symndx
= object
->symtab_index(r_sym
);
668 gold_assert(new_symndx
!= -1U);
672 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
673 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
674 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
675 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
676 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
677 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
678 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
680 // We are adjusting a section symbol. We need to find
681 // the symbol table index of the section symbol for
682 // the output section corresponding to input section
683 // in which this symbol is defined.
684 gold_assert(r_sym
< local_count
);
687 object
->local_symbol_input_shndx(r_sym
, &is_ordinary
);
688 gold_assert(is_ordinary
);
689 Output_section
* os
= object
->output_section(shndx
);
690 gold_assert(os
!= NULL
);
691 gold_assert(os
->needs_symtab_index());
692 new_symndx
= os
->symtab_index();
702 const Symbol
* gsym
= object
->global_symbol(r_sym
);
703 gold_assert(gsym
!= NULL
);
704 if (gsym
->is_forwarder())
705 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
707 gold_assert(gsym
->has_symtab_index());
708 new_symndx
= gsym
->symtab_index();
711 // Get the new offset--the location in the output section where
712 // this relocation should be applied.
714 Address offset
= reloc
.get_r_offset();
716 if (offset_in_output_section
!= invalid_address
)
717 new_offset
= offset
+ offset_in_output_section
;
720 section_offset_type sot_offset
=
721 convert_types
<section_offset_type
, Address
>(offset
);
722 section_offset_type new_sot_offset
=
723 output_section
->output_offset(object
, relinfo
->data_shndx
,
725 gold_assert(new_sot_offset
!= -1);
726 new_offset
= new_sot_offset
;
729 // In an object file, r_offset is an offset within the section.
730 // In an executable or dynamic object, generated by
731 // --emit-relocs, r_offset is an absolute address.
732 if (!parameters
->options().relocatable())
734 new_offset
+= view_address
;
735 if (offset_in_output_section
!= invalid_address
)
736 new_offset
-= offset_in_output_section
;
739 reloc_write
.put_r_offset(new_offset
);
740 reloc_write
.put_r_info(elfcpp::elf_r_info
<size
>(new_symndx
, r_type
));
742 // Handle the reloc addend based on the strategy.
744 if (strategy
== Relocatable_relocs::RELOC_COPY
)
746 if (sh_type
== elfcpp::SHT_RELA
)
747 Reloc_types
<sh_type
, size
, big_endian
>::
748 copy_reloc_addend(&reloc_write
,
753 // The relocation uses a section symbol in the input file.
754 // We are adjusting it to use a section symbol in the output
755 // file. The input section symbol refers to some address in
756 // the input section. We need the relocation in the output
757 // file to refer to that same address. This adjustment to
758 // the addend is the same calculation we use for a simple
759 // absolute relocation for the input section symbol.
761 const Symbol_value
<size
>* psymval
= object
->local_symbol(r_sym
);
763 unsigned char* padd
= view
+ offset
;
766 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
768 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
;
769 addend
= Reloc_types
<sh_type
, size
, big_endian
>::
770 get_reloc_addend(&reloc
);
771 addend
= psymval
->value(object
, addend
);
772 Reloc_types
<sh_type
, size
, big_endian
>::
773 set_reloc_addend(&reloc_write
, addend
);
777 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
780 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
781 Relocate_functions
<size
, big_endian
>::rel8(padd
, object
,
785 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
786 Relocate_functions
<size
, big_endian
>::rel16(padd
, object
,
790 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
791 Relocate_functions
<size
, big_endian
>::rel32(padd
, object
,
795 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
796 Relocate_functions
<size
, big_endian
>::rel64(padd
, object
,
800 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
801 Relocate_functions
<size
, big_endian
>::rel32_unaligned(padd
,
811 pwrite
+= reloc_size
;
814 gold_assert(static_cast<section_size_type
>(pwrite
- reloc_view
)
818 } // End namespace gold.
820 #endif // !defined(GOLD_TARGET_RELOC_H)