std::vector<Output_relaxed_input_section*>*);
};
+// Arm_relobj class.
+
+template<bool big_endian>
+class Arm_relobj : public Sized_relobj<32, big_endian>
+{
+ public:
+ static const Arm_address invalid_address = static_cast<Arm_address>(-1);
+
+ Arm_relobj(const std::string& name, Input_file* input_file, off_t offset,
+ const typename elfcpp::Ehdr<32, big_endian>& ehdr)
+ : Sized_relobj<32, big_endian>(name, input_file, offset, ehdr),
+ stub_tables_(), local_symbol_is_thumb_function_()
+ { }
+
+ ~Arm_relobj()
+ { }
+
+ // Return the stub table of the SHNDX-th section if there is one.
+ Stub_table<big_endian>*
+ stub_table(unsigned int shndx) const
+ {
+ gold_assert(shndx < this->stub_tables_.size());
+ return this->stub_tables_[shndx];
+ }
+
+ // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
+ void
+ set_stub_table(unsigned int shndx, Stub_table<big_endian>* stub_table)
+ {
+ gold_assert(shndx < this->stub_tables_.size());
+ this->stub_tables_[shndx] = stub_table;
+ }
+
+ // Whether a local symbol is a THUMB function. R_SYM is the symbol table
+ // index. This is only valid after do_count_local_symbol is called.
+ bool
+ local_symbol_is_thumb_function(unsigned int r_sym) const
+ {
+ gold_assert(r_sym < this->local_symbol_is_thumb_function_.size());
+ return this->local_symbol_is_thumb_function_[r_sym];
+ }
+
+ // Scan all relocation sections for stub generation.
+ void
+ scan_sections_for_stubs(Target_arm<big_endian>*, const Symbol_table*,
+ const Layout*);
+
+ // Convert regular input section with index SHNDX to a relaxed section.
+ void
+ convert_input_section_to_relaxed_section(unsigned shndx)
+ {
+ // The stubs have relocations and we need to process them after writing
+ // out the stubs. So relocation now must follow section write.
+ this->invalidate_section_offset(shndx);
+ this->set_relocs_must_follow_section_writes();
+ }
+
+ // Downcast a base pointer to an Arm_relobj pointer. This is
+ // not type-safe but we only use Arm_relobj not the base class.
+ static Arm_relobj<big_endian>*
+ as_arm_relobj(Relobj* relobj)
+ { return static_cast<Arm_relobj<big_endian>*>(relobj); }
+
+ protected:
+ // Post constructor setup.
+ void
+ do_setup()
+ {
+ // Call parent's setup method.
+ Sized_relobj<32, big_endian>::do_setup();
+
+ // Initialize look-up tables.
+ Stub_table_list empty_stub_table_list(this->shnum(), NULL);
+ this->stub_tables_.swap(empty_stub_table_list);
+ }
+
+ // Count the local symbols.
+ void
+ do_count_local_symbols(Stringpool_template<char>*,
+ Stringpool_template<char>*);
+
+ void
+ do_relocate_sections(const General_options& options,
+ const Symbol_table* symtab, const Layout* layout,
+ const unsigned char* pshdrs,
+ typename Sized_relobj<32, big_endian>::Views* pivews);
+
+ private:
+ // List of stub tables.
+ typedef std::vector<Stub_table<big_endian>*> Stub_table_list;
+ Stub_table_list stub_tables_;
+ // Bit vector to tell if a local symbol is a thumb function or not.
+ // This is only valid after do_count_local_symbol is called.
+ std::vector<bool> local_symbol_is_thumb_function_;
+};
+
// Utilities for manipulating integers of up to 32-bits
namespace utils
}
}
+// Arm_relobj methods.
+
+// Scan relocations for stub generation.
+
+template<bool big_endian>
+void
+Arm_relobj<big_endian>::scan_sections_for_stubs(
+ Target_arm<big_endian>* arm_target,
+ const Symbol_table* symtab,
+ const Layout* layout)
+{
+ unsigned int shnum = this->shnum();
+ const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
+
+ // Read the section headers.
+ const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
+ shnum * shdr_size,
+ true, true);
+
+ // To speed up processing, we set up hash tables for fast lookup of
+ // input offsets to output addresses.
+ this->initialize_input_to_output_maps();
+
+ const Relobj::Output_sections& out_sections(this->output_sections());
+
+ Relocate_info<32, big_endian> relinfo;
+ relinfo.options = ¶meters->options();
+ relinfo.symtab = symtab;
+ relinfo.layout = layout;
+ relinfo.object = this;
+
+ const unsigned char* p = pshdrs + shdr_size;
+ for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
+ {
+ typename elfcpp::Shdr<32, big_endian> shdr(p);
+
+ unsigned int sh_type = shdr.get_sh_type();
+ if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
+ continue;
+
+ off_t sh_size = shdr.get_sh_size();
+ if (sh_size == 0)
+ continue;
+
+ unsigned int index = this->adjust_shndx(shdr.get_sh_info());
+ if (index >= this->shnum())
+ {
+ // Ignore reloc section with bad info. This error will be
+ // reported in the final link.
+ continue;
+ }
+
+ Output_section* os = out_sections[index];
+ if (os == NULL)
+ {
+ // This relocation section is against a section which we
+ // discarded.
+ continue;
+ }
+ Arm_address output_offset = this->get_output_section_offset(index);
+
+ if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
+ {
+ // Ignore reloc section with unexpected symbol table. The
+ // error will be reported in the final link.
+ continue;
+ }
+
+ const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
+ sh_size, true, false);
+
+ unsigned int reloc_size;
+ if (sh_type == elfcpp::SHT_REL)
+ reloc_size = elfcpp::Elf_sizes<32>::rel_size;
+ else
+ reloc_size = elfcpp::Elf_sizes<32>::rela_size;
+
+ if (reloc_size != shdr.get_sh_entsize())
+ {
+ // Ignore reloc section with unexpected entsize. The error
+ // will be reported in the final link.
+ continue;
+ }
+
+ size_t reloc_count = sh_size / reloc_size;
+ if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
+ {
+ // Ignore reloc section with uneven size. The error will be
+ // reported in the final link.
+ continue;
+ }
+
+ gold_assert(output_offset != invalid_address
+ || this->relocs_must_follow_section_writes());
+
+ // Get the section contents. This does work for the case in which
+ // we modify the contents of an input section. We need to pass the
+ // output view under such circumstances.
+ section_size_type input_view_size = 0;
+ const unsigned char* input_view =
+ this->section_contents(index, &input_view_size, false);
+
+ relinfo.reloc_shndx = i;
+ relinfo.data_shndx = index;
+ arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
+ reloc_count, os,
+ output_offset == invalid_address,
+ input_view,
+ os->address(),
+ input_view_size);
+ }
+
+ // After we've done the relocations, we release the hash tables,
+ // since we no longer need them.
+ this->free_input_to_output_maps();
+}
+
+// Count the local symbols. The ARM backend needs to know if a symbol
+// is a THUMB function or not. For global symbols, it is easy because
+// the Symbol object keeps the ELF symbol type. For local symbol it is
+// harder because we cannot access this information. So we override the
+// do_count_local_symbol in parent and scan local symbols to mark
+// THUMB functions. This is not the most efficient way but I do not want to
+// slow down other ports by calling a per symbol targer hook inside
+// Sized_relobj<size, big_endian>::do_count_local_symbols.
+
+template<bool big_endian>
+void
+Arm_relobj<big_endian>::do_count_local_symbols(
+ Stringpool_template<char>* pool,
+ Stringpool_template<char>* dynpool)
+{
+ // We need to fix-up the values of any local symbols whose type are
+ // STT_ARM_TFUNC.
+
+ // Ask parent to count the local symbols.
+ Sized_relobj<32, big_endian>::do_count_local_symbols(pool, dynpool);
+ const unsigned int loccount = this->local_symbol_count();
+ if (loccount == 0)
+ return;
+
+ // Intialize the thumb function bit-vector.
+ std::vector<bool> empty_vector(loccount, false);
+ this->local_symbol_is_thumb_function_.swap(empty_vector);
+
+ // Read the symbol table section header.
+ const unsigned int symtab_shndx = this->symtab_shndx();
+ elfcpp::Shdr<32, big_endian>
+ symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+
+ // Read the local symbols.
+ const int sym_size =elfcpp::Elf_sizes<32>::sym_size;
+ gold_assert(loccount == symtabshdr.get_sh_info());
+ off_t locsize = loccount * sym_size;
+ const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
+ locsize, true, true);
+
+ // Loop over the local symbols and mark any local symbols pointing
+ // to THUMB functions.
+
+ // Skip the first dummy symbol.
+ psyms += sym_size;
+ typename Sized_relobj<32, big_endian>::Local_values* plocal_values =
+ this->local_values();
+ for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
+ {
+ elfcpp::Sym<32, big_endian> sym(psyms);
+ elfcpp::STT st_type = sym.get_st_type();
+ Symbol_value<32>& lv((*plocal_values)[i]);
+ Arm_address input_value = lv.input_value();
+
+ if (st_type == elfcpp::STT_ARM_TFUNC
+ || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0)))
+ {
+ // This is a THUMB function. Mark this and canonicalize the
+ // symbol value by setting LSB.
+ this->local_symbol_is_thumb_function_[i] = true;
+ if ((input_value & 1) == 0)
+ lv.set_input_value(input_value | 1);
+ }
+ }
+}
+
+// Relocate sections.
+template<bool big_endian>
+void
+Arm_relobj<big_endian>::do_relocate_sections(
+ const General_options& options,
+ const Symbol_table* symtab,
+ const Layout* layout,
+ const unsigned char* pshdrs,
+ typename Sized_relobj<32, big_endian>::Views* pviews)
+{
+ // Call parent to relocate sections.
+ Sized_relobj<32, big_endian>::do_relocate_sections(options, symtab, layout,
+ pshdrs, pviews);
+
+ // We do not generate stubs if doing a relocatable link.
+ if (parameters->options().relocatable())
+ return;
+
+ // Relocate stub tables.
+ unsigned int shnum = this->shnum();
+
+ Target_arm<big_endian>* arm_target =
+ Target_arm<big_endian>::default_target();
+
+ Relocate_info<32, big_endian> relinfo;
+ relinfo.options = &options;
+ relinfo.symtab = symtab;
+ relinfo.layout = layout;
+ relinfo.object = this;
+
+ for (unsigned int i = 1; i < shnum; ++i)
+ {
+ Arm_input_section<big_endian>* arm_input_section =
+ arm_target->find_arm_input_section(this, i);
+
+ if (arm_input_section == NULL
+ || !arm_input_section->is_stub_table_owner()
+ || arm_input_section->stub_table()->empty())
+ continue;
+
+ // We cannot discard a section if it owns a stub table.
+ Output_section* os = this->output_section(i);
+ gold_assert(os != NULL);
+
+ relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
+ relinfo.reloc_shdr = NULL;
+ relinfo.data_shndx = i;
+ relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size;
+
+ gold_assert((*pviews)[i].view != NULL);
+
+ // We are passed the output section view. Adjust it to cover the
+ // stub table only.
+ Stub_table<big_endian>* stub_table = arm_input_section->stub_table();
+ gold_assert((stub_table->address() >= (*pviews)[i].address)
+ && ((stub_table->address() + stub_table->data_size())
+ <= (*pviews)[i].address + (*pviews)[i].view_size));
+
+ off_t offset = stub_table->address() - (*pviews)[i].address;
+ unsigned char* view = (*pviews)[i].view + offset;
+ Arm_address address = stub_table->address();
+ section_size_type view_size = stub_table->data_size();
+
+ stub_table->relocate_stubs(&relinfo, arm_target, os, view, address,
+ view_size);
+ }
+}
+
// A class to handle the PLT data.
template<bool big_endian>
projects / thirdparty / binutils-gdb.git / commitdiff
