I an a newbie to assembly language, been reading jeff duntemann's book, and I have been trying to write some code by myself too. There is an example in the book on converting binary values to hex values. I decided to re-write the code again by myself for self-practice but i get a segmentation fault. Here is the code:
section .bss
BUFFLEN equ 16
BUFF resb 16
section .data
HexStr: db " 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h",10
HexLen equ $-HexStr
Digits: db 30h,31h,32h,33h,34h,35h,36h,37h,38h,39h,61h,62h,63h,64h,65h,66h
section .text
global _start
_start:
Read:
mov eax,3
mov ebx,0
mov ecx,BUFFLEN
mov edx,BUFF
INT 80H
cmp eax,0
je Done
mov ebp,eax
mov ebx,Digits
xor ecx,ecx
xor eax,eax
xor edx,edx
Translate:
mov al,byte [BUFF+ecx]
mov edx,eax
and eax,0fh
xlat
mov byte [HexStr+4*ecx+2],al
shr dl,4
mov al,dl
xlat
mov byte [HexStr+4*ecx+1],al
inc ecx
cmp ecx,ebp
jb Translate
Write:
mov eax,4
mov ebx,1
mov ecx,HexLen
mov edx,HexStr
int 80h
jmp Read
Done:
mov eax,1
mov ebx,0
int 80h
