[PATCH, nds32] Add audio ISA extension and modify the disassemble implement.

[Kuan-Lin Chen]

First, add nds32 audio ISA extension including opcodes and registers.
Second, modify the disassemble implement.
The original disassemble decode instruction opcode using switch-case.
It is hard to synchronize when adding new instructions.
Therefore, the new implement reuses nds32_opcodes to dump the instructions.

The plain text ChangeLog is as below:

binutils/ChangeLog
2014-09-16  Kuan-Lin Chen  <kuanlinchentw@gmail.com>

       * readelf.c (decode_NDS32_machine_flags): Display ABI2 FP+.

include/opcode/ChangeLog
2014-09-16  Kuan-Lin Chen <kuanlinchentw@gmail.com>

        * nds32.h: Add new opcode declaration.

opcodes/ChangeLog
2014-09-16 Kuan-Lin Chen <kuanlinchentw@gmail.com>

       * nds32-asm.c (nds32_opcodes, operand_fields, keyword_im5_i,
       keyword_im5_m, keyword_accumulator, keyword_aridx, keyword_aridx2,
       keyword_aridxi): Add audio ISA extension.
       (keyword_gpr, keyword_usr, keyword_sr, keyword_cp, keyword_cpr,
       keyword_fsr, keyword_fdr, keyword_abdim, keyword_abm, keyword_dpref_st,
       keyword_cctl_lv, keyword_standby_st, keyword_msync_st): Adjust scrope
       for nds32-dis.c using.
       (build_opcode_syntax): Remove dead code.
       (parse_re, parse_a30b20, parse_rt21, parse_rte_start, parse_rte_end,
       parse_rte69_start, parse_rte69_end, parse_im5_ip, parse_im5_mr,
       parse_im6_ip, parse_im6_iq, parse_im6_mr, parse_im6_ms): Add audio ISA
       operand parser.
       * nds32-asm.h: Declare.
       * nds32-dis.c: Use array nds32_opcodes to disassemble instead of
       decoding by switch.

-- 
Best regards,
Kuan-Lin Chen.
kuanlinchentw@gmail.com
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