bits 64

_start:
    mov     rax, 0xBDBDBDBDBDBDBDBD
    
    ; pushp rax
    db 0xD5, 0x08, 0x50
    ; popp r16
    db 0xD5, 0x18, 0x58
    
    ; pushp r16
    db 0xD5, 0x18, 0x50
    ; popp r31
    db 0xD5, 0x19, 0x5F
    
    int3