section .data
    msg db "Oi!", 0xA, 0
    len equ $-msg
 
section .text
    global _start
 
_start:
    mov rax, 1         ; número da chamada do sistema para escrever
    mov rdi, 1         ; identificador de saída padrão (stdout)
    mov rsi, msg       ; endereço da mensagem
    mov rdx, len       ; comprimento da mensagem
    syscall            ; chamada do sistema para escrever
 
    mov rax, 60        ; número da chamada do sistema para sair
    xor rdi, rdi       ; código de saída 0
    syscall            ; chamada do sistema para sair
 

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