Index

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, BRB, CFP, COSP, CPP, DC, DVP, GCSPOPCX, GCSPOPX, GCSPUSHM, GCSPUSHX, GCSSS1, IC, TLBI, and TRCIT.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 0 1 0 1 0 1 0 0 0 0 1 op1 CRn CRm op2 Rt
L

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

Alias Is preferred when
AT CRn == '0111' && CRm == '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 == '100x' && SysOp(op1,CRn,CRm,op2) == Sys_TLBI
TRCIT op1 == '011' && CRn == '0111' && CRm == '0010' && op2 == '111'

Operation

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