我正在用 NASM 16 位编写我自己的基本操作系统，它不断打印一个我没有告诉它的字符串

问题描述

我写了一个终端样式的操作系统，但下一个扇区没有加载，我似乎无法找到为什么我从未告诉它打印的字符串正在打印。

[bits 16]           ; tell assembler that working in real mode(16 bit mode)
[org 0x7c00]        ; organize from 0x7C00 memory location where BIOS will load us
%define cr 0xd
%define lf 0xa

start:              ; start label from where our code starts


    xor ax,ax           ; set ax register to 0
    mov ds,ax           ; set data segment(ds) to 0
    mov es,ax           ; set extra segment(es) to 0
    mov bx,0x8000
    ;clear screen
    mov ah,00h
    mov al,2
    int 10h
    ;reset cursor
    mov ah,02h
    mov bh,00h
    mov dh,00h
    mov dl,00h
    int 10h
    ;start kernl
    mov si,intro_os
    call print_str ;here is where I call the defined print function,it should move straight to pt2 of it
    ;Functions here
    print_str:
    mov ah,0xE
    .repeat:
    lodsb
    cmp al,0
    je .done
    int 10h
    jmp .repeat
    .done:
    ret
    read_inp:
    .repeat:
    mov ah,00h
    int 16h
    cmp al,0x1c
    je .done
    mov bx,[input_idx]
    mov [input+bx],al
    inc byte [input_idx]
    mov ah,0xE
    int 10h
    jmp .repeat
    .done:
    mov byte [input_idx],0
    ret
    ;end functions
    ;vars and strings
    intro_os db 'ProtOS VERSION:ALPHA-001,written by Julian Ratcliffe.',cr,lf,0
    loading db 'Please wait,we are loading the operating system...',0 ;this is being printed unintentionally
    kern_mn db cr,'<ProtOS_V_A001>---$ ',0
    input times 100 db 0
    input_idx db 0
    ;end vars and strings
    ; load second sector into memory
    mov ah,0x02                    ; load second stage to memory
    mov al,1                       ; numbers of sectors to read into memory
    mov dl,0x80                    ; sector read from fixed/usb disk
    mov ch,0                       ; cylinder number
    mov dh,0                       ; head number
    mov cl,2                       ; sector number
    mov bx,_OS_Stage_2             ; load into es:bx segment :offset of buffer
    int 0x13                        ; disk I/O interrupt

    jmp _OS_Stage_2                 ; jump to second stage



    ; boot loader magic number
    times ((0x200 - 2) - ($ - $$)) db 0x00     ;set 512 bytes for boot sector which are necessary
    dw 0xAA55                                  ; boot signature 0xAA & 0x55







_OS_Stage_2:
    ;part two of OS (it never reaches this)
    mov ah,02h
    int 10h
    
    mov si,intro_os
    call print_str
    mov si,kern_mn
    call print_str
    call read_inp
    ; add how much memory we need
    times (1024 - ($-$$)) db 0x00
    

它调用打印函数来打印 intro_os 字符串，但它以某种方式最终打印出加载字符串，并且代码中的所有移动都停止了，我确实尝试通过将 cli 和 hlt 放在调用下方来查看它是什么打印功能，这表明它（故障）在函数部分或 vars 部分。 请帮我看看我做错了什么，提前致谢。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）