MFC0 - MIPS instruction reference

mfc0Move from coprocessor 0 
Reads a Coprocessor 0 (CP0) control register and places its value in general-purpose register $t1.
Used in Exceptions and coprocessor 0MIPS assembly
 
Forms  mfc0 ,   
Operands $t1 Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31). 
$8 A coprocessor 0 register, written by number: $8 (vaddr), $12 (status), $13 (cause) or $14 (epc). 
CP0 registers hold exception/interrupt state: register 8 (BadVAddr), 12 (Status), 13 (Cause), 14 (EPC), etc.
 # Set CP0 vaddr register 8 to 0x1234, then read it. Inspect $t0: 0x1234.
li $t1, 0x1234
mtc0 $t1, $8
mfc0 $t0, $8