msr

Move to System Register

MSR <system_reg>, <Xt>

Moves general-purpose register to system register.

Pseudocode Operation

SystemRegister[system_reg] ← Xt

Example

MSR system_reg, x3

Encoding

Binary Layout

1101010100

31:22

0

21

1

20

o0

19

op1

18:16

CRn

15:12

CRm

11:8

op2

7:5

Rt

4:0

 

Format System

Opcode 0xD5100000

Extension System

Operands

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

Related

Other forms of msr

• msr Move to Special Register (Banked)
• msr Move Immediate to Special Register (A32)
• msr Move Immediate to Special Register (Thumb)
• msr Move Register to Special Register (Thumb)
• msr Move Register to Status Register

More in System

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD500401F	MSR <pstatefield>, #<imm>		A64		1101010100000 | op1 | 0100 | CRm | op2 | 11111
0xD5100000	MSR (<systemreg>|S<op0>_<op1>_<Cn>_<Cm>_<op2>), <Xt>		A64		1101010100 | 0 | 1 | o0 | op1 | CRn | CRm | op2 | Rt

Description

Move general-purpose register to System Register allows the PE to write an AArch64 System register from a general-purpose register.

Operation

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