[PATCH][GAS] aarch64: Add DSB instruction Armv8.7-a variant

[Nick Clifton]

Hi Przemyslaw,

> gas/ChangeLog:
> 
> 2020-10-23  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* NEWS: Docs update.
> 	* config/tc-aarch64.c (parse_operands): Add
> 	AARCH64_OPND_BARRIER_DSB_NXS handler.
> 	(md_begin): Add content of aarch64_barrier_dsb_nxs_options to
> 	aarch64_barrier_opt_hsh hash.
> 	* testsuite/gas/aarch64/system-4-invalid.d: New test.
> 	* testsuite/gas/aarch64/system-4-invalid.l: New test.
> 	* testsuite/gas/aarch64/system-4-invalid.s: New test.
> 	* testsuite/gas/aarch64/system-4.d: New test.
> 	* testsuite/gas/aarch64/system-4.s: New test.
> 
> include/ChangeLog:
> 
> 2020-10-23  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* opcode/aarch64.h (enum aarch64_opnd): New operand
> 	AARCH64_OPND_BARRIER_DSB_NXS.
> 	(aarch64_barrier_dsb_nxs_options): Declare DSB nXS options.
> 
> opcodes/ChangeLog:
> 
> 2020-10-23  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* aarch64-asm.c (aarch64_ins_barrier_dsb_nxs): New inserter.
> 	* aarch64-asm.h (AARCH64_DECL_OPD_INSERTER): New inserter
> 	ins_barrier_dsb_nx.
> 	* aarch64-dis.c (aarch64_ext_barrier_dsb_nxs): New extractor.
> 	* aarch64-dis.h (AARCH64_DECL_OPD_EXTRACTOR): New extractor
> 	ext_barrier_dsb_nx.
> 	* aarch64-opc.c (aarch64_print_operand): New options table
> 	aarch64_barrier_dsb_nxs_options.
> 	* aarch64-opc.h (enum aarch64_field_kind): New field name FLD_CRm_dsb_nxs.
> 	* aarch64-tbl.h (struct aarch64_opcode): Define DSB nXS barrier
> 	Armv8.7-a instruction.
> 	* aarch64-asm-2.c: Regenerate.
> 	* aarch64-dis-2.c: Regenerate.
> 	* aarch64-opc-2.c: Regenerate.

Approved - please apply.

Cheers
  Nick