bits 64

SECTION .data
    var1:   dq 0x0
    var2:   dq 0x0

SECTION .text
global _start
_start:
    int3

read:
    mov rax, 0
    add rax, 4
    mov rbx, rax
    sub rax, 4
    xor rax, 0x10101010

    xor rax, rax
    sub rax, 1
    add rax, 1

    mov rax, -1
    mov rax, 0xFFFFFFFFFFFFFFFF

    mov [var1], rax
    mov rax, var1

exit:
    ; sys_exit(42)
    mov     rax,60  ; system call number (sys_exit)
    mov     rdi,42   ; system call return value
    syscall

    times 64 nop