io_test.asm

section .data
    text db "number> "
    nl   db 10

section .bss
    inputChar resb 1
    tmp resb 1

section .text
    global _start

_start:
    call _printText
    call _getChar
    call _printChar
    call _printNewLine

    mov rax, 60
    mov rdi, 0
    syscall

_printNewLine:
    mov rax, 1
    mov rdi, 1
    mov rsi, nl
    mov rdx, 1
    syscall
    ret

_printChar:
    mov rax, 1
    mov rdi, 1
    mov rsi, inputChar
    mov rdx, 1
    syscall
    ret

_getChar:
    ; １桁入力
    mov rax, 0
    mov rdi, 0
    mov rsi, inputChar
    mov rdx, 1
    syscall

    ; 改行を捨てる
    mov rax, 0
    mov rdi, 0
    mov rsi, tmp
    mov rdx, 1
    syscall
    ret

_printText:
    mov rax, 1
    mov rdi, 1
    mov rsi, text
    mov rdx, 8
    syscall
    ret