bits 64

    SECTION .data
; empty

    SECTION .text
global _start
_start:
    %include "header.asm.inc"
    
    mov    eax, 0x11223344
    mov    ebx, 0x55667788

    xchg   ebx,eax  ; eax gets content of ebx and vice versa
    xchg   ecx,eax
    xchg   edx,eax

    xchg   bx,ax    ; again, 0x66 is opcode size prefix
    xchg   bh,ah
    xchg   bl,al
    
    %include "sysexit.asm.inc"