Assembly 32 bit Programming Control Tricks

by: ev1lut10n (A Chinese Man who lives in Indonesia)

#Looping method

there are many tehnics for looping in asm, here's a method for looping 
===============
while:
        cmp eax,0 ; here we compare eax with 0 
	je keluar ; if ecx equal to 0 we do a jump to macro keluar
	
	;put any asm instruction here
	
	inc eax  ; here we increment eax	
        jmp while ; rejump to while here
=================

ok here we start with real c0de:

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section .data
	tes db 'ev1lut10n\n',10;
global  _start

_start:
jmp short forking

forking:
mov eax,2
int 80h

set_our_konter:
mov ecx,2
mov edi,0

while:
	mov edx,11
	mov edi,ecx
	mov ecx,tes 
	call (makro_writeln)
	mov ecx,edi
	dec ecx 	
      	jnz while 



keluar:
push    byte 0x01
pop     eax
int     80h


makro_writeln:
        mov ebx,1
	mov eax,4
	int 80h
        ret
=========



ok let's see this one
at first we set the counter 
set_our_konter:
mov ecx,2


at the end of while we put
        dec ecx 	
  	jnz while
where we decrement ecx and while its not zero we still do a jmp to while 
label

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#Nested method

for nested there are many instruction we may use ex:
jnz means jump if not zero
je means jump if equal
jnc means jump if not carry
and so on

from above sample we decement ecx and do a jump while its not zero

       dec ecx 	
      	jnz while