英文:
Stack Initialization Problem in Real Mode: How to Properly Initialize the stack?
问题
我正在用x86汇编语言编写一个简单的引导加载程序，以下是代码部分：
org 0x7C00
section boot start=0x7C00
; 初始化栈
mov ax, 0xF000
mov ss, ax
mov sp, 0xFFFF
mov bp, 0xFFFF
; 加载额外的扇区
mov ah, 0x02
mov al, 0x02 ; 扇区数
mov ch, 0x00 ; 柱面
mov cl, 0x02 ; 第2扇区
mov dh, 0x00 ; 磁头
; 地址 = es*0x10 + bx
xor bx, bx ; 将0移到es
mov ds, bx
mov es, bx
mov bx, 0x8000
int 0x13
jmp 0x8000
times 510-($-$$) db 0
db 0x55, 0xAA ; 结束引导扇区
当我删除栈初始化代码时，引导加载程序可以正常工作，并且BIOS中断被执行，但当我添加该代码后，什么都不会发生，中断不起作用。
我做错了什么？为什么会发生这种情况？
英文:
I am writing a simple boot loader in x86 assembly, here is the code for it :
org 0x7C00
section boot start=0x7C00
; initializing the stack
mov ax,0xF000
mov ss,ax
mov sp,0xFFFF
mov bp,0xFFFF
; loading the additional sectors
mov ah,0x02
mov al,0x02 ; number of sectors
mov ch,0x00 ; cylinder
mov cl,0x02 ; sector 2
mov dh,0x00 ; head
; address = es*0x10 + bx
xor bx,bx ; moving 0 to es
mov ds,bx
mov es,bx
mov bx,0x8000
int 0x13
jmp 0x8000
times 510-($-$$) db 0
db 0x55, 0xaa ; Ending the boot sector
the problem is that whenever I remove the stack initialization code the boot loader works just fine and the BIOS interrupts are executed, but when I add the code back in nothing happens and the interrupts don't work.
what am I doing wrong ?? and why is this happening ??
答案1
得分: 2
A common setting for a MBR boot ss:sp is to set them to 00000h:07c00h, so that the stack ends just before the start of the boot code.
英文:
A common setting for a MBR boot ss:sp is to set them to 00000h:07c00h, so that the stack ends just before the start of the boot code.
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