Index

MRRS

Move System Register to two adjacent general-purpose registers allows the PE to read an AArch64 128-bit System register into two adjacent 64-bit general-purpose registers.

System
(FEAT_SYSREG128)

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 1 1 1 o0 op1 CRn CRm op2 Rt
L

MRRS <Xt>, <Xt+1>, (<systemreg>|S<op0>_<op1>_<Cn>_<Cm>_<op2>)

if !IsFeatureImplemented(FEAT_SYSREG128) then UNDEFINED;
if Rt<0> == '1' then UNDEFINED;
AArch64.CheckSystemAccess('1':o0, op1, CRn, CRm, op2, Rt, L);

integer t = UInt(Rt);
integer t2 = UInt(Rt + 1);

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 first general-purpose destination register, encoded in the "Rt" field.
<Xt+1>

Is the 64-bit name of the second general-purpose destination register, encoded as "Rt" +1.
<systemreg>

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

AArch64.SysRegRead128(sys_op0, sys_op1, sys_crn, sys_crm, sys_op2, t, t2);