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andyz74



Joined: 26 Nov 2007
Posts: 36
Location: Germany
andyz74
Hello folks, I have some problem, that I don't understand.
There's some code, which simply should display a decimal number, which looks like this

Code:
format elf executable

entry start

macro print_dez wo
{
pusha
mov ax, wo
xor cx,cx
mov bx,10

schl1:
xor dx,dx
div bx
push dx
inc cx
cmp dx,0

jnz schl1

schl2:
pop dx
mov [ziffer],dl
push ecx
mov eax, 4
mov ebx, 1
mov ecx, ziffer
mov edx, 1
int 128
pop ecx
loop schl2

popa
}

start:


print_dez 1234


mov eax,1
int 128


; here just variables ------  end of code -------------------------------


eingabe db 90h,90h,90h
ziffer db 0

hello db 90h,90h,90h
    


Unfortunately, nothing is displayed. I debugged using "ald" and it seems, that the macro isnt't able to write to my variable "ziffer", which will later be displayed.

Does anybody know, where's the problem?
ThX in advance, Andy

Btw: the 90h in the end are just for myself to find my variable better in the disassembler, so don't mind. Smile
Post 30 Nov 2008, 10:06
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16850
Location: In your JS exploiting you and your system
revolution
you probably mean this:
Code:
...
inc cx
cmp ax,0 ;instead of cmp dx,0
...    
and add this:
Code:
...
pop dx
add dl,'0' ;add this to get dl into ASCII codes
mov [ziffer],dl ;check this, do you want a null termimated string?
...    
Post 30 Nov 2008, 11:10
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andyz74



Joined: 26 Nov 2007
Posts: 36
Location: Germany
andyz74
Yeah, now it works. Two unnecesssary errors. Maybe "brain-debugging" is more necessary than code-debugging. :-/

Thank U revolution! Smile
Post 30 Nov 2008, 11:25
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