i'm a very beginer in assembly programing...


I want to read from a file which is given as an argument....and write the content of the file in the screen....
when i compile the following program it shows SEGMENTATION FAULT..
i cant find wats wrong some one pls help me....!!



here is the code..\



section .data
data:resb 40
length: equ $-data

section .text
global _start

_start:
pop ebx
pop ebx
pop ebx
mov eax,3
mov [data],eax
int 80h
call filewrite


filewrite:
mov eax,4
mov ebx,1
mov ecx,data
mov edx,length
int 80h
mov eax,6
int 80h
ret

section .data
data:db"i am an assembly programmer!",10
len: equ $-data
newfile:db"newfile.txt"
newdata:resb len
section .text
global _start

_start:
pop ebx
pop ebx
pop ebx
mov eax,5
mov ecx,00644Q
int 80h

test eax,eax
js skipread
call fileread
call createnewfile
call writenewfile
skipread:
mov eax,1
mov ebx,0
int 80h
fileread:
mov ebx,eax
mov eax,3
mov ecx,newdata
mov edx,len
int 80h
ret
createnewfile:
mov eax,8
mov ebx,newfile
mov ecx,00644Q
int 80h
ret
writenewfile:
mov ebx,eax
mov eax,4
mov ecx,newdata
mov edx,len
int 80h
mov eax,6
int 80h
mov eax,1
int 80h
ret