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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, CFP, CPP, DC, DVP, IC, and TLBI.

313029282726252423222120191817161514131211109876543210
1101010100001op1CRnCRmop2Rt
L

System

SYS #<op1>, <Cn>, <Cm>, #<op2>{, <Xt>}

AArch64.CheckSystemAccess('01', op1, CRn, CRm, op2, Rt, L);

integer t = UInt(Rt);

integer sys_op1 = UInt(op1);
integer sys_op2 = UInt(op2);
integer sys_crn = UInt(CRn);
integer sys_crm = UInt(CRm);

Assembler Symbols

<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

AliasIs preferred when
ATCRn == '0111' && CRm == '100x' && SysOp(op1,'0111',CRm,op2) == Sys_AT
CFPop1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '100'
CPPop1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '111'
DCCRn == '0111' && SysOp(op1,'0111',CRm,op2) == Sys_DC
DVPop1 == '011' && CRn == '0111' && CRm == '0011' && op2 == '101'
ICCRn == '0111' && SysOp(op1,'0111',CRm,op2) == Sys_IC
TLBICRn == '1000' && SysOp(op1,'1000',CRm,op2) == Sys_TLBI

Operation

AArch64.SysInstr(1, sys_op1, sys_crn, sys_crm, sys_op2, X[t]);
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