Flat Assembler Hello World (Linux x86-64)

hello.asm

format ELF64 executable 3

segment readable executable

entry $
    mov eax, 1                      ; sys_write
    mov edi, 1                      ; fd = STDOUT_FILENO
    mov rsi, message                ; buf
    mov rdx, message.end - message  ; count
    syscall
    mov eax, 60                     ; sys_exit
    xor rdi, rdi                    ; status = 0
    syscall

message: db "hello, world", 10
.end: