1 // target-reloc.h -- target specific relocation support -*- C++ -*-
3 #ifndef GOLD_TARGET_RELOC_H
4 #define GOLD_TARGET_RELOC_H
13 // Pick the ELF relocation accessor class and the size based on
14 // SH_TYPE, which is either SHT_REL or SHT_RELA.
16 template<int sh_type
, int size
, bool big_endian
>
19 template<int size
, bool big_endian
>
20 struct Reloc_types
<elfcpp::SHT_REL
, size
, big_endian
>
22 typedef typename
elfcpp::Rel
<size
, big_endian
> Reloc
;
23 static const int reloc_size
= elfcpp::Elf_sizes
<size
>::rel_size
;
26 template<int size
, bool big_endian
>
27 struct Reloc_types
<elfcpp::SHT_RELA
, size
, big_endian
>
29 typedef typename
elfcpp::Rela
<size
, big_endian
> Reloc
;
30 static const int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
33 // This function implements the generic part of reloc scanning. This
34 // is an inline function which takes a class whose operator()
35 // implements the machine specific part of scanning. We do it this
36 // way to avoidmaking a function call for each relocation, and to
37 // avoid repeating the generic code for each target.
39 template<int size
, bool big_endian
, int sh_type
, typename Scan
>
42 const General_options
& options
,
44 Sized_object
<size
, big_endian
>* object
,
45 const unsigned char* prelocs
,
48 const unsigned char* plocal_syms
,
51 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
52 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
53 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
56 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
58 Reltype
reloc(prelocs
);
60 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
61 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
62 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
64 if (r_sym
< local_count
)
66 assert(plocal_syms
!= NULL
);
67 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
69 const unsigned int shndx
= lsym
.get_st_shndx();
70 if (shndx
< elfcpp::SHN_LORESERVE
71 && !object
->is_section_included(lsym
.get_st_shndx()))
73 // RELOC is a relocation against a local symbol in a
74 // section we are discarding. We can ignore this
75 // relocation. It will eventually become a reloc
76 // against the value zero.
78 // FIXME: We should issue a warning if this is an
79 // allocated section; is this the best place to do it?
81 // FIXME: The old GNU linker would in some cases look
82 // for the linkonce section which caused this section to
83 // be discarded, and, if the other section was the same
84 // size, change the reloc to refer to the other section.
85 // That seems risky and weird to me, and I don't know of
86 // any case where it is actually required.
91 scan
.local(options
, object
, reloc
, r_type
, lsym
);
95 Symbol
* gsym
= global_syms
[r_sym
- local_count
];
97 if (gsym
->is_forwarder())
98 gsym
= symtab
->resolve_forwards(gsym
);
100 scan
.global(options
, object
, reloc
, r_type
, gsym
);
105 // This function implements the generic part of relocation processing.
106 // This is an inline function which take a class whose operator()
107 // implements the machine specific part of relocation. We do it this
108 // way to avoid making a function call for each relocation, and to
109 // avoid repeating the generic relocation handling code for each
112 // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
113 // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
114 // RELOCATE implements operator() to do a relocation.
116 // PRELOCS points to the relocation data. RELOC_COUNT is the number
117 // of relocs. VIEW is the section data, VIEW_ADDRESS is its memory
118 // address, and VIEW_SIZE is the size.
120 template<int size
, bool big_endian
, int sh_type
, typename Relocate
>
123 const Relocate_info
<size
, big_endian
>* relinfo
,
124 const unsigned char* prelocs
,
127 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
130 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
131 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
134 unsigned int local_count
= relinfo
->local_symbol_count
;
135 typename
elfcpp::Elf_types
<size
>::Elf_Addr
*local_values
= relinfo
->values
;
136 Symbol
** global_syms
= relinfo
->symbols
;
138 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
140 Reltype
reloc(prelocs
);
142 off_t offset
= reloc
.get_r_offset();
143 if (offset
< 0 || offset
>= view_size
)
145 fprintf(stderr
, _("%s: %s: reloc has bad offset %zu\n"),
146 program_name
, relinfo
->location(i
, offset
).c_str(),
147 static_cast<size_t>(offset
));
151 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
152 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
153 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
155 Sized_symbol
<size
>* sym
;
156 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
158 if (r_sym
< local_count
)
161 value
= local_values
[r_sym
];
165 Symbol
* gsym
= global_syms
[r_sym
- local_count
];
166 assert(gsym
!= NULL
);
167 if (gsym
->is_forwarder())
168 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
170 sym
= static_cast<Sized_symbol
<size
>*>(gsym
);
171 value
= sym
->value();
173 if (sym
->shnum() == elfcpp::SHN_UNDEF
174 && sym
->binding() != elfcpp::STB_WEAK
)
176 fprintf(stderr
, _("%s: %s: undefined reference to '%s'\n"),
177 program_name
, relinfo
->location(i
, offset
).c_str(),
183 relocate
.relocate(relinfo
, i
, reloc
, r_type
, sym
, value
, view
+ offset
,
184 view_address
+ offset
, view_size
);
188 } // End namespace gold.
190 #endif // !defined(GOLD_TARGET_RELOC_H)
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