mfmsr

Move From Machine State Register

mfmsr RT

Moves the contents of the Machine State Register (MSR) into a general-purpose register.

Encoding

Binary Layout

31

0:5

RT

6:10

/

11:15

/

16:20

83

21:30

/

31

 

Format X-form

Opcode 0x7C0000A6

Extension Privileged

Operands

• RT
  Target

Example

mfmsr r3

Registers Altered

MSR

Related

More in Privileged

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

Moves the entire Machine State Register (MSR) into the general-purpose register RT. This is a privileged instruction that allows reading of system state including interrupt enable, privilege level, and other control bits. No condition registers or status fields are modified by this instruction.

Operation

RT ← MSR

Programming Note

This instruction is privileged.