SYS System instruction For more information, see Op0 equals 0b01, cache maintenance, TLB maintenance, and address translation instructions for the encodings of System instructions. This instruction is used by the aliases AT CRn == '0111' && CRm IN {'100x'} && SysOp(op1, '0111', CRm, op2) == Sys_AT BRB op1 == '001' && CRn == '0111' && CRm == '0010' && SysOp('001', '0111', '0010', op2) == Sys_BRB CFP op1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '100' COSP op1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '110' CPP op1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '111' DC CRn == '0111' && SysOp(op1, '0111', CRm, op2) == Sys_DC DVP op1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '101' GCSPOPCX op1 == '000' && CRn == '0111' && CRm == '0111' && op2 == '101' GCSPOPX op1 == '000' && CRn == '0111' && CRm == '0111' && op2 == '110' GCSPUSHM op1 == '011' && CRn == '0111' && CRm == '0111' && op2 == '000' GCSPUSHX op1 == '000' && CRn == '0111' && CRm == '0111' && op2 == '100' GCSSS1 op1 == '011' && CRn == '0111' && CRm == '0111' && op2 == '010' IC CRn == '0111' && SysOp(op1, '0111', CRm, op2) == Sys_IC TLBI CRn IN {'100x'} && SysOp(op1, CRn, CRm, op2) == Sys_TLBI TRCIT op1 == '011' && CRn == '0111' && CRm == '0010' && op2 == '111' See below for details of when each alias is preferred. 1 1 0 1 0 1 0 1 0 0 0 0 1 SYS #<op1>, <Cn>, <Cm>, #<op2>{, <Xt>} AArch64.CheckSystemAccess('01', op1, CRn, CRm, op2, Rt, L); constant integer t = UInt(Rt); constant integer sys_op0 = 1; constant integer sys_op1 = UInt(op1); constant integer sys_op2 = UInt(op2); constant integer sys_crn = UInt(CRn); constant integer sys_crm = UInt(CRm); <op1> Is a 3-bit unsigned immediate, in the range 0 to 7, encoded in the "op1" field. <Cn> Is a name 'Cn', with 'n' in the range 0 to 15, encoded in the "CRn" field. <Cm> Is a name 'Cm', with 'm' in the range 0 to 15, encoded in the "CRm" field. <op2> Is a 3-bit unsigned immediate, in the range 0 to 7, encoded in the "op2" field. <Xt> Is the 64-bit name of the optional general-purpose source register, defaulting to '11111', encoded in the "Rt" field. Alias Conditions AArch64.SysInstr(sys_op0, sys_op1, sys_crn, sys_crm, sys_op2, t);