asm2.s

.global _start
.intel_syntax noprefix

_start:
    CALL  print_hello_world
    JMP   exit

print_hello_world:
    MOV      rax, 0x01
    MOV      rdi, 0x01
    LEA      rsi, [hello_str]
    MOV      rdx, 14
    SYSCALL
    RET

exit:
    MOV      rax, 0x3c
    MOV      rdi, 0
    SYSCALL

.section .data
    hello_str: .asciz "hello, world!\n"