sys_write不会输出0x0A

Question

我正在组装练习计算器。它正常工作，除了显示答案时，新行字符（0x0A）将不会显示。相反，有一个包含数字0014的框（可能是Unicode）。我做错了吗？

bits 64 ; 64-bit (amd64) code

section .data
    stdin: equ 0
    stdout: equ 1

    sys_read: equ 0
    sys_write: equ 1
    sys_exit: equ 60

    l_out1: db "Simple Assembly Addition",0Ah,": "
    l_len1: equ 27
    l_out2: db ": "
    l_len2: equ 2
    l_out3: db "Answer is: "
    l_len3: equ 11
section .bss
    l_in1: resb 3       ; reserve 3 bytes (digits)
    l_in2: resb 3       ; reserve 3 bytes (digits)
    l_ans: resb 4       ; answer
section .text
    global _start
_start:
    mov rax,sys_write   ; system call id
    mov rdi,stdout      ; descriptor
    mov rsi,l_out1
    mov rdx,l_len1
    syscall

    mov rax,sys_read    ; system call id
    mov rdi,stdin       ; descriptor
    mov rsi,l_in1
    mov rdx,3       ; see .bss
    syscall

    mov rax,sys_write   ; system call id
    mov rdi,stdout      ; descriptor
    mov rsi,l_out2
    mov rdx,l_len2
    syscall

    mov rax,sys_read    ; system call id
    mov rdi,stdin       ; descriptor
    mov rsi,l_in2
    mov rdx,3
    syscall

    mov r8,[l_in1]      ; copy l_in1 to rax
    sub r8,"0"
    mov r9,[l_in2]      ; copy l_in2 to rax
    sub r9,"0"

    add r8,r9
    add r8,"0"      ; add 0 for ascii conversion

    mov [l_ans],r8      ; store answer to address of l_ans

    mov rax,sys_write   ; system call id
    mov rdi,stdout      ; descriptor
    mov rsi,l_out3
    mov rdx,l_len3
    syscall

    mov rax,sys_write   ; system call id
    mov rdi,stdout      ; descriptor
    mov rsi,l_ans
    mov rdx,4
    syscall

    mov rax,sys_write
    mov rdi,stdout
    mov rsi,0Ah
    mov rdx,1
    syscall

    mov rax,sys_exit    ; system call id
    mov rdi,0       ; return 0
    syscall