[PATCH v5] gold: Add Mips64 support.

[Vladimir Radosavljevic]

Comments addressed.

Regards,
Vladimir.

ChangeLog -

    * gold/mips.cc (enum Special_relocation_symbol): New enum type.
    (is_readonly_section): New function.
    (eh_reloc): Likewise.
    (Mips_got_entry::is_section_symbol_): New member.
    (Mips_got_entry::is_section_symbol): New method.
    (Mips_got_info::record_local_got_symbol): Add is_section_symbol
    argument.
    (Mips_relobj::mips_elf_options_section_name): New method.
    (Mips_output_data_got::record_local_got_symbol): Add
    is_section_symbol argument, and pass it to 
    Mips_got_info::record_local_got_symbol.
    (Mips_output_data_got::got_offset): Add addend argument, and pass
    it to Relobj::local_got_offset.
    (struct Mips_output_reloc_writer): New type.
    (class Mips_output_data_reloc): New class.
    (Mips_output_data_plt::Reloc_section): Change type to
    Mips_output_data_reloc.
    (Target_mips::Reloc_section): Likewise.
    (Mips_reloc_types::get_r_addend): Remove unsigned from return type.
    (Mips_classify_reloc::get_r_type2): New method.
    (Mips_classify_reloc::get_r_type3): Likewise.
    (Mips_classify_reloc::get_r_ssym): Likewise.
    (Target_mips::Reloca_section): Remove.
    (Relocate::should_apply_static_reloc): Rename from
    should_apply_r_mips_32_reloc.
    (Target_mips::copy_reloc): Replace Reltype parameter with r_type
    and r_offset.
    (Mips_relocate_functions::Valtype): New type.
    (Mips_relocate_functions::Valtype64): New type.
    (Mips_relocate_functions::check_overflow): New method.
    (Mips_relocate_functions::mips_reloc_unshuffle): Move to public
    interface.
    (Mips_relocate_functions::mips_reloc_shuffle): Likewise.
    (Mips_relocate_functions::rel16): Add support for resolving
    relocations for Mips64.
    (Mips_relocate_functions::rel32): Likewise.
    (Mips_relocate_functions::reljalr): Likewise.
    (Mips_relocate_functions::relpc32): Likewise.
    (Mips_relocate_functions::rel26): Likewise.
    (Mips_relocate_functions::relpc16): Likewise.
    (Mips_relocate_functions::relmicromips_pc7_s1): Likewise.
    (Mips_relocate_functions::relmicromips_pc10_s1): Likewise.
    (Mips_relocate_functions::relmicromips_pc16_s1): Likewise.
    (Mips_relocate_functions::do_relhi16): Likewise.
    (Mips_relocate_functions::do_relgot16_local): Likewise.
    (Mips_relocate_functions::rello16): Likewise.
    (Mips_relocate_functions::relgot): Likewise.
    (Mips_relocate_functions::relgotpage): Likewise.
    (Mips_relocate_functions::relgotofst): Likewise.
    (Mips_relocate_functions::relgot_hi16): Likewise.
    (Mips_relocate_functions::relgot_lo16): Likewise.
    (Mips_relocate_functions::relgprel): Likewise.
    (Mips_relocate_functions::relgprel32): Likewise.
    (Mips_relocate_functions::tlsrelhi16): Likewise.
    (Mips_relocate_functions::tlsrello16): Likewise.
    (Mips_relocate_functions::tlsrel32): Likewise.
    (Mips_relocate_functions::relsub): Likewise.
    (Mips_relocate_functions::releh): New method.
    (Mips_relocate_functions::rel64): Likewise.
    (Mips_got_info::record_local_got_symbol): Add is_section_symbol and
    pass it to Mips_got_entry.
    (Mips_got_info::add_local_entries): Pass addend argument
    to code functions, and for STT_SECTION symbols call 
    add_symbolless_local_addend.
    (Mips_got_info::add_tls_entries): Pass addend argument to code
    functions.
    (Mips_relobj::do_read_symbols): Read gp value that was used to
    create object.
    (Mips_output_data_plt::plt_entry): Remove opcode from l[wd]
    instruction. Opcode for instruction will be selected later.
    (Target_mips::gc_process_relocs): Add case for SHT_RELA.
    (Target_mips::scan_relocatable_relocs): Likewise.
    (Target_mips::emit_relocs_scan): Likewise.
    (Target_mips::relocate_relocs): Likewise.
    (Target_mips::do_finalize_sections): Skip objects for merging
    processor specific flags in which all input sections will be
    discarded.
    (mips_get_size_for_reloc): Add case for R_MIPS_EH.
    (Target_mips::Scan::get_reference_flags): Likewise.
    (Target_mips::relocate_special_relocatable): Call rel26 method with
    calculate_only and calculated_value arguments.
    (Target_mips::Scan::local): Add case for R_MIPS_EH. Don't create a
    dynamic relocation against a readonly sections, and pass
    is_section_symbol to Mips_got_info::record_local_got_symbol.
    (Target_mips::Scan::global): Add case for R_MIPS_EH. Don't create a
    dynamic relocation against a readonly sections, and pass r_type
    and r_offset to Target_mips::copy_reloc.
    (Target_mips::Relocate::relocate): Add support for resolving
    relocations for Mips64.
    (Target_mips::mips_info): Add case for Mips64 default dynamic
    linker name.
    (Target_selector_mips): Correct emulation names.
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