mrs

Move System Register

MRS <Xt>, <system_reg>

Moves system register to general-purpose register.

Pseudocode Operation

Xt ← SystemRegister[imm15]

Example

MRS x3, system_reg

Encoding

Binary Layout

1101010100

31:22

1

21

1

20

o0

19

op1

18:16

CRn

15:12

CRm

11:8

op2

7:5

Rt

4:0

 

Format System

Opcode 0xD5300000

Extension System

Operands

• Xt
  Transfer 64-bit integer register (load/store)
• system_reg
  Sys Reg

Related

Other forms of mrs

• mrs Move from Special Register (Banked)
• mrs Move Special Register to Register (Thumb)
• mrs Move Status Register to Register

More in System

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD5300000	MRS <Xt>, (<systemreg>|S<op0>_<op1>_<Cn>_<Cm>_<op2>)		A64		1101010100 | 1 | 1 | o0 | op1 | CRn | CRm | op2 | Rt

Description

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

Operation

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