[Morello] altbase: LDUR/STUR

[Morello] altbase: LDUR/STUR

gas/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* config/tc-aarch64.c (parse_operands): Add Rsz2, Fsz, St and
	CAPADDR_SIMM9.
	(try_to_encode_as_unscaled_ldst): Add unscaled altbase loads.
	* testsuite/gas/aarch64/morello_ldst-c64.d: Add tests.
	* testsuite/gas/aarch64/morello_ldst.d: Likewise.
	* testsuite/gas/aarch64/morello_ldst.s: Likewise.

include/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* opcode/aarch64.h (aarch64_opnd): Add sz2, Fsz, St and
	CAPADDR_SIMM9.
	(aarch64_op): Add OP_STR_POS_3, OP_LDR_POS_3, OP_STR_POS_4,
	OP_LDR_POS_4, OP_LDUR_3, OP_STUR_3, OP_LDUR_4, OP_STUR_4.

opcodes/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* aarch64-asm.c (aarch64_ins_fregsz): New function.
	(aarch64_ins_addr_simm): Add ldst_altbase to assert.
	* aarch64-asm.h (ins_fregsz): New function declaration.
	* aarch64-dis.c (aarch64_ext_fregsz): New function.
	(aarch64_ext_addr_simm): Disable writeback for ldst_altbase.
	* aarch64-dis.h (ext_fregsz): New function declaration.
	* aarch64-opc.c (fields): Add altbase_sf2 and altbase_sf3.
	(operand_general_constraint_met_p): Add CAPADDR_SIMM9.
	(aarch64_print_operand): Add CAPADDR_SIMM9, Rsz2, Fsz, St.
	* aarch64-opc.h (aarch64_field_kind): Add FLD_altbase_sf2, FLD_altbase_sf3.
	* aarch64-tbl.h (aarch64_opcode_table): New instructions.
	(AARCH64_OPERANDS): New operands.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.