[PATCH 3/6] MIPS/GAS: Add Loongson EXT2 Instructions support.

[Paul Hua]

MIPS/GAS: Add Loongson EXT2 Instructions support.

2018-08-04  Chenghua Xu  <paul.hua.gm@gmail.com>

bfd/
        * elfxx-mips.c (print_mips_ases): Add Loongson EXT2 extension.

binutils/
        * readelf.c (print_mips_ases): Add Loongson EXT2 extension.

gas/
        * NEWS: Mention Loongson EXTensions R2 (EXT2) support.
        * config/tc-mips.c (options): Add OPTION_LOONGSON_EXT2 and
        OPTION_NO_LOONGSON_EXT2.
        (md_longopts): Likewise.
        (mips_ases): Define availability for EXT.
        (mips_convert_ase_flags): Map ASE_LOONGSON_EXT2 to
        AFL_ASE_LOONGSON_EXT2.
        (md_show_usage): Add help for -mloongson-ext2 and
        -mno-loongson-ext2.
        * doc/as.texi: Document -mloongson-ext2, -mno-loongson-ext2.
        * doc/c-mips.texi: Document -mloongson-ext2, -mno-loongson-ext2,
        .set loongson-ext2 and .set noloongson-ext2.
        * testsuite/gas/mips/loongson-ext2.d: New test.
        * testsuite/gas/mips/loongson-ext2.s: New test.
        * testsuite/gas/mips/mips.exp: Run loongson-ext2 test.

include/
        * elf/mips.h (AFL_ASE_LOONGSON_EXT2): New macro.
        (AFL_ASE_MASK): Update to include AFL_ASE_LOONGSON_EXT2.
        * opcode/mips.h (ASE_LOONGSON_EXT2): New macro.

opcodes/
        * mips-dis.c (parse_mips_ase_option): Handle -M loongson-ext
        option.
        (print_mips_disassembler_options): Document -M loongson-ext.
        * mips-opc.c (LEXT2): New macro.
        (mips_opcodes): Add cto, ctz, dcto, dctz instructions.
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