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fixed errors in stack section

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This commit is contained in:
Qitian Zeng 2019-07-26 09:38:16 -05:00
parent 7aff64740e
commit 862271f2eb
1 changed files with 8 additions and 6 deletions
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14
04-bootsector-stack/boot_sect_stack.asm
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@ -9,10 +9,16 @@ push 'C'
; to show how the stack grows downwards ; to show how the stack grows downwards
mov al, [0x7ffe] ; 0x8000 - 2 mov al, [0x7ffe] ; 0x8000 - 2
int 0x10 int 0x10 ; prints A
mov al, [0x7ffc] ; 0x8000 - 4
int 0x10 ; prints B
mov al, [0x7ffa] ; 0x8000 - 6
int 0x10 ; prints C
; however, don't try to access [0x8000] now, because it won't work ; however, don't try to access [0x8000] now, because it won't work
; you can only access the stack top so, at this point, only 0x7ffe (look above) ; 0x8000 is just the base address and doesn't contain anything
mov al, [0x8000] mov al, [0x8000]
int 0x10 int 0x10
@ -32,10 +38,6 @@ pop bx
mov al, bl mov al, bl
int 0x10 ; prints A int 0x10 ; prints A
; data that has been pop'd from the stack is garbage now
mov al, [0x8000]
int 0x10
jmp $ jmp $
times 510-($-$$) db 0 times 510-($-$$) db 0