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MRS

Move System Register allows the PE to read an AArch64 System register into a general-purpose register.

313029282726252423222120191817161514131211109876543210
110101010011o0op1CRnCRmop2Rt
L
AArch64.CheckSystemAccess('1':o0, op1, CRn, CRm, op2, Rt, L);

integer t = UInt(Rt);

integer sys_op0 = 2 + UInt(o0);
integer sys_op1 = UInt(op1);
integer sys_op2 = UInt(op2);
integer sys_crn = UInt(CRn);
integer sys_crm = UInt(CRm);

Assembler Symbols

<Xt>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rt" field.

<systemreg>

Is a System register name, encoded in the "o0:op1:CRn:CRm:op2".

The System register names are defined in 'AArch64 System Registers' in the System Register XML.

<op0> Is an unsigned immediate, encoded in o0:
o0 <op0>
0 2
1 3
<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.

Operation

X[t] = AArch64.SysRegRead(sys_op0, sys_op1, sys_crn, sys_crm, sys_op2);
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