+
+ is_defined_in_discarded_section =
+ (gsym->is_defined_in_discarded_section()
+ && gsym->is_undefined());
+ shndx = 0;
+ }
+
+ Symbol_value<size> symval2;
+ if (is_defined_in_discarded_section)
+ {
+ if (comdat_behavior == CB_UNDETERMINED)
+ {
+ std::string name = object->section_name(relinfo->data_shndx);
+ comdat_behavior = relocate_comdat_behavior.get(name.c_str());
+ }
+ if (comdat_behavior == CB_PRETEND)
+ {
+ // FIXME: This case does not work for global symbols.
+ // We have no place to store the original section index.
+ // Fortunately this does not matter for comdat sections,
+ // only for sections explicitly discarded by a linker
+ // script.
+ bool found;
+ typename elfcpp::Elf_types<size>::Elf_Addr value =
+ object->map_to_kept_section(shndx, &found);
+ if (found)
+ symval2.set_output_value(value + psymval->input_value());
+ else
+ symval2.set_output_value(0);
+ }
+ else
+ {
+ if (comdat_behavior == CB_WARNING)
+ gold_warning_at_location(relinfo, i, offset,
+ _("relocation refers to discarded "
+ "section"));
+ symval2.set_output_value(0);
+ }
+ symval2.set_no_output_symtab_entry();
+ psymval = &symval2;
+ }
+
+ // If OFFSET is out of range, still let the target decide to
+ // ignore the relocation. Pass in NULL as the VIEW argument so
+ // that it can return quickly without trashing an invalid memory
+ // address.
+ unsigned char *v = view + offset;
+ if (offset < 0 || static_cast<section_size_type>(offset) >= view_size)
+ v = NULL;
+
+ if (!relocate.relocate(relinfo, Classify_reloc::sh_type, target,
+ output_section, i, prelocs, sym, psymval,
+ v, view_address + offset, view_size))
+ continue;
+
+ if (v == NULL)
+ {
+ gold_error_at_location(relinfo, i, offset,
+ _("reloc has bad offset %zu"),
+ static_cast<size_t>(offset));
+ continue;
+ }
+
+ if (issue_undefined_symbol_error(sym))
+ gold_undefined_symbol_at_location(sym, relinfo, i, offset);
+ else if (sym != NULL
+ && sym->visibility() != elfcpp::STV_DEFAULT
+ && (sym->is_strong_undefined() || sym->is_from_dynobj()))
+ visibility_error(sym);
+
+ if (sym != NULL && sym->has_warning())
+ relinfo->symtab->issue_warning(sym, relinfo, i, offset);
+ }
+}
+
+// Apply an incremental relocation.
+
+template<int size, bool big_endian, typename Target_type,
+ typename Relocate>
+void
+apply_relocation(const Relocate_info<size, big_endian>* relinfo,
+ Target_type* target,
+ typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
+ unsigned int r_type,
+ typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
+ const Symbol* gsym,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr address,
+ section_size_type view_size)
+{
+ // Construct the ELF relocation in a temporary buffer.
+ const int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
+ unsigned char relbuf[reloc_size];
+ elfcpp::Rela_write<size, big_endian> orel(relbuf);
+ orel.put_r_offset(r_offset);
+ orel.put_r_info(elfcpp::elf_r_info<size>(0, r_type));
+ orel.put_r_addend(r_addend);
+
+ // Setup a Symbol_value for the global symbol.
+ const Sized_symbol<size>* sym = static_cast<const Sized_symbol<size>*>(gsym);
+ Symbol_value<size> symval;
+ gold_assert(sym->has_symtab_index() && sym->symtab_index() != -1U);
+ symval.set_output_symtab_index(sym->symtab_index());
+ symval.set_output_value(sym->value());
+ if (gsym->type() == elfcpp::STT_TLS)
+ symval.set_is_tls_symbol();
+ else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
+ symval.set_is_ifunc_symbol();
+
+ Relocate relocate;
+ relocate.relocate(relinfo, elfcpp::SHT_RELA, target, NULL,
+ -1U, relbuf, sym, &symval,
+ view + r_offset, address + r_offset, view_size);
+}
+
+// A class for inquiring about properties of a relocation,
+// used while scanning relocs during a relocatable link and
+// garbage collection. This class may be used as the default
+// for SHT_RELA targets, but SHT_REL targets must implement
+// a derived class that overrides get_size_for_reloc.
+// The MIPS-64 target also needs to override the methods
+// for accessing the r_sym and r_type fields of a relocation,
+// due to its non-standard use of the r_info field.
+
+template<int sh_type_, int size, bool big_endian>
+class Default_classify_reloc
+{
+ public:
+ typedef typename Reloc_types<sh_type_, size, big_endian>::Reloc
+ Reltype;
+ typedef typename Reloc_types<sh_type_, size, big_endian>::Reloc_write
+ Reltype_write;
+ static const int reloc_size =
+ Reloc_types<sh_type_, size, big_endian>::reloc_size;
+ static const int sh_type = sh_type_;
+
+ // Return the symbol referred to by the relocation.
+ static inline unsigned int
+ get_r_sym(const Reltype* reloc)
+ { return elfcpp::elf_r_sym<size>(reloc->get_r_info()); }
+
+ // Return the type of the relocation.
+ static inline unsigned int
+ get_r_type(const Reltype* reloc)
+ { return elfcpp::elf_r_type<size>(reloc->get_r_info()); }
+
+ // Return the explicit addend of the relocation (return 0 for SHT_REL).
+ static inline typename elfcpp::Elf_types<size>::Elf_Swxword
+ get_r_addend(const Reltype* reloc)
+ { return Reloc_types<sh_type_, size, big_endian>::get_reloc_addend(reloc); }
+
+ // Write the r_info field to a new reloc, using the r_info field from
+ // the original reloc, replacing the r_sym field with R_SYM.
+ static inline void
+ put_r_info(Reltype_write* new_reloc, Reltype* reloc, unsigned int r_sym)
+ {
+ unsigned int r_type = elfcpp::elf_r_type<size>(reloc->get_r_info());
+ new_reloc->put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type));
+ }
+
+ // Write the r_addend field to a new reloc.
+ static inline void
+ put_r_addend(Reltype_write* to,
+ typename elfcpp::Elf_types<size>::Elf_Swxword addend)
+ { Reloc_types<sh_type_, size, big_endian>::set_reloc_addend(to, addend); }
+
+ // Return the size of the addend of the relocation (only used for SHT_REL).
+ static unsigned int
+ get_size_for_reloc(unsigned int, Relobj*)
+ {
+ gold_unreachable();
+ return 0;
+ }
+};
+
+// This class may be used as a typical class for the
+// Scan_relocatable_reloc parameter to scan_relocatable_relocs.
+// This class is intended to capture the most typical target behaviour,
+// while still permitting targets to define their own independent class
+// for Scan_relocatable_reloc.
+
+template<typename Classify_reloc>
+class Default_scan_relocatable_relocs
+{
+ public:
+ typedef typename Classify_reloc::Reltype Reltype;
+ static const int reloc_size = Classify_reloc::reloc_size;
+ static const int sh_type = Classify_reloc::sh_type;
+
+ // Return the symbol referred to by the relocation.
+ static inline unsigned int
+ get_r_sym(const Reltype* reloc)
+ { return Classify_reloc::get_r_sym(reloc); }
+
+ // Return the type of the relocation.
+ static inline unsigned int
+ get_r_type(const Reltype* reloc)
+ { return Classify_reloc::get_r_type(reloc); }
+
+ // Return the strategy to use for a local symbol which is not a
+ // section symbol, given the relocation type.
+ inline Relocatable_relocs::Reloc_strategy
+ local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym)
+ {
+ // We assume that relocation type 0 is NONE. Targets which are
+ // different must override.
+ if (r_type == 0 && r_sym == 0)
+ return Relocatable_relocs::RELOC_DISCARD;
+ return Relocatable_relocs::RELOC_COPY;
+ }
+
+ // Return the strategy to use for a local symbol which is a section
+ // symbol, given the relocation type.
+ inline Relocatable_relocs::Reloc_strategy
+ local_section_strategy(unsigned int r_type, Relobj* object)
+ {
+ if (sh_type == elfcpp::SHT_RELA)
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
+ else
+ {
+ switch (Classify_reloc::get_size_for_reloc(r_type, object))
+ {
+ case 0:
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
+ case 1:
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1;
+ case 2:
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2;
+ case 4:
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4;
+ case 8:
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8;
+ default:
+ gold_unreachable();
+ }
+ }
+ }
+
+ // Return the strategy to use for a global symbol, given the
+ // relocation type, the object, and the symbol index.
+ inline Relocatable_relocs::Reloc_strategy
+ global_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
+};
+
+// This is a strategy class used with scan_relocatable_relocs
+// and --emit-relocs.
+
+template<typename Classify_reloc>
+class Default_emit_relocs_strategy
+{
+ public:
+ typedef typename Classify_reloc::Reltype Reltype;
+ static const int reloc_size = Classify_reloc::reloc_size;
+ static const int sh_type = Classify_reloc::sh_type;
+
+ // Return the symbol referred to by the relocation.
+ static inline unsigned int
+ get_r_sym(const Reltype* reloc)
+ { return Classify_reloc::get_r_sym(reloc); }
+
+ // Return the type of the relocation.
+ static inline unsigned int
+ get_r_type(const Reltype* reloc)
+ { return Classify_reloc::get_r_type(reloc); }
+
+ // A local non-section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_non_section_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
+
+ // A local section symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ local_section_strategy(unsigned int, Relobj*)
+ {
+ if (sh_type == elfcpp::SHT_RELA)
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
+ else
+ {
+ // The addend is stored in the section contents. Since this
+ // is not a relocatable link, we are going to apply the
+ // relocation contents to the section as usual. This means
+ // that we have no way to record the original addend. If the
+ // original addend is not zero, there is basically no way for
+ // the user to handle this correctly. Caveat emptor.
+ return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
+ }
+ }
+
+ // A global symbol.
+ inline Relocatable_relocs::Reloc_strategy
+ global_strategy(unsigned int, Relobj*, unsigned int)
+ { return Relocatable_relocs::RELOC_COPY; }
+};
+
+// Scan relocs during a relocatable link. This is a default
+// definition which should work for most targets.
+// Scan_relocatable_reloc must name a class type which provides three
+// functions which return a Relocatable_relocs::Reloc_strategy code:
+// global_strategy, local_non_section_strategy, and
+// local_section_strategy. Most targets should be able to use
+// Default_scan_relocatable_relocs as this class.
+
+template<int size, bool big_endian, typename Scan_relocatable_reloc>
+void
+scan_relocatable_relocs(
+ Symbol_table*,
+ Layout*,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_syms,
+ Relocatable_relocs* rr)
+{
+ typedef typename Scan_relocatable_reloc::Reltype Reltype;
+ const int reloc_size = Scan_relocatable_reloc::reloc_size;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ Scan_relocatable_reloc scan;
+
+ for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
+ {
+ Reltype reloc(prelocs);
+
+ Relocatable_relocs::Reloc_strategy strategy;
+
+ if (needs_special_offset_handling
+ && !output_section->is_input_address_mapped(object, data_shndx,
+ reloc.get_r_offset()))
+ strategy = Relocatable_relocs::RELOC_DISCARD;
+ else
+ {
+ const unsigned int r_sym = Scan_relocatable_reloc::get_r_sym(&reloc);
+ const unsigned int r_type =
+ Scan_relocatable_reloc::get_r_type(&reloc);
+
+ if (r_sym >= local_symbol_count)
+ strategy = scan.global_strategy(r_type, object, r_sym);
+ else
+ {
+ gold_assert(plocal_syms != NULL);
+ typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
+ + r_sym * sym_size);
+ unsigned int shndx = lsym.get_st_shndx();
+ bool is_ordinary;
+ shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
+ if (is_ordinary
+ && shndx != elfcpp::SHN_UNDEF
+ && !object->is_section_included(shndx))
+ {
+ // RELOC is a relocation against a local symbol
+ // defined in a section we are discarding. Discard
+ // the reloc. FIXME: Should we issue a warning?
+ strategy = Relocatable_relocs::RELOC_DISCARD;
+ }
+ else if (lsym.get_st_type() != elfcpp::STT_SECTION)
+ strategy = scan.local_non_section_strategy(r_type, object,
+ r_sym);
+ else
+ {
+ strategy = scan.local_section_strategy(r_type, object);
+ if (strategy != Relocatable_relocs::RELOC_DISCARD)
+ object->output_section(shndx)->set_needs_symtab_index();
+ }
+
+ if (strategy == Relocatable_relocs::RELOC_COPY)
+ object->set_must_have_output_symtab_entry(r_sym);
+ }