1 // target-reloc.h -- target specific relocation support -*- C++ -*-
3 #ifndef GOLD_TARGET_RELOC_H
4 #define GOLD_TARGET_RELOC_H
9 #include "reloc-types.h"
14 // This function implements the generic part of reloc scanning. This
15 // is an inline function which takes a class whose operator()
16 // implements the machine specific part of scanning. We do it this
17 // way to avoidmaking a function call for each relocation, and to
18 // avoid repeating the generic code for each target.
20 template<int size, bool big_endian, typename Target_type, int sh_type,
24 const General_options& options,
28 Sized_relobj<size, big_endian>* object,
29 const unsigned char* prelocs,
32 const unsigned char* plocal_syms,
35 typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
36 const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
37 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
40 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
42 Reltype reloc(prelocs);
44 typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
45 unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
46 unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
48 if (r_sym < local_count)
50 assert(plocal_syms != NULL);
51 typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
53 const unsigned int shndx = lsym.get_st_shndx();
54 if (shndx < elfcpp::SHN_LORESERVE
55 && shndx != elfcpp::SHN_UNDEF
56 && !object->is_section_included(lsym.get_st_shndx()))
58 // RELOC is a relocation against a local symbol in a
59 // section we are discarding. We can ignore this
60 // relocation. It will eventually become a reloc
61 // against the value zero.
63 // FIXME: We should issue a warning if this is an
64 // allocated section; is this the best place to do it?
66 // FIXME: The old GNU linker would in some cases look
67 // for the linkonce section which caused this section to
68 // be discarded, and, if the other section was the same
69 // size, change the reloc to refer to the other section.
70 // That seems risky and weird to me, and I don't know of
71 // any case where it is actually required.
76 scan.local(options, symtab, layout, target, object, reloc, r_type,
81 Symbol* gsym = global_syms[r_sym - local_count];
83 if (gsym->is_forwarder())
84 gsym = symtab->resolve_forwards(gsym);
86 scan.global(options, symtab, layout, target, object, reloc, r_type,
92 // This function implements the generic part of relocation processing.
93 // This is an inline function which take a class whose operator()
94 // implements the machine specific part of relocation. We do it this
95 // way to avoid making a function call for each relocation, and to
96 // avoid repeating the generic relocation handling code for each
99 // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
100 // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
101 // RELOCATE implements operator() to do a relocation.
103 // PRELOCS points to the relocation data. RELOC_COUNT is the number
104 // of relocs. VIEW is the section data, VIEW_ADDRESS is its memory
105 // address, and VIEW_SIZE is the size.
107 template<int size, bool big_endian, typename Target_type, int sh_type,
111 const Relocate_info<size, big_endian>* relinfo,
113 const unsigned char* prelocs,
116 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
119 typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
120 const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
123 unsigned int local_count = relinfo->local_symbol_count;
124 const typename Sized_relobj<size, big_endian>::Local_values* local_values =
125 relinfo->local_values;
126 const Symbol* const * global_syms = relinfo->symbols;
128 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
130 Reltype reloc(prelocs);
132 off_t offset = reloc.get_r_offset();
134 typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
135 unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
136 unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
138 const Sized_symbol<size>* sym;
139 typename elfcpp::Elf_types<size>::Elf_Addr value;
141 if (r_sym < local_count)
144 value = (*local_values)[r_sym];
148 const Symbol* gsym = global_syms[r_sym - local_count];
149 assert(gsym != NULL);
150 if (gsym->is_forwarder())
151 gsym = relinfo->symtab->resolve_forwards(gsym);
153 sym = static_cast<const Sized_symbol<size>*>(gsym);
154 value = sym->value();
157 if (!relocate.relocate(relinfo, target, i, reloc, r_type, sym, value,
158 view + offset, view_address + offset, view_size))
161 if (offset < 0 || offset >= view_size)
163 fprintf(stderr, _("%s: %s: reloc has bad offset %zu\n"),
164 program_name, relinfo->location(i, offset).c_str(),
165 static_cast<size_t>(offset));
170 && sym->is_undefined()
171 && sym->binding() != elfcpp::STB_WEAK)
173 fprintf(stderr, _("%s: %s: undefined reference to '%s'\n"),
174 program_name, relinfo->location(i, offset).c_str(),
179 if (sym != NULL && sym->has_warning())
180 relinfo->symtab->issue_warning(sym, relinfo->location(i, offset));
184 } // End namespace gold.
186 #endif // !defined(GOLD_TARGET_RELOC_H)