Hello all. 16/32/64 bit mode disassembler with several options (for Dos & Windows). It supports all 8086-80486/Pentium instructions with MMX

New version of quick decoder for download.

This doesn't work on Windows 10 x64, seems to be a compatibility issue with x64.

format PE console 4.0
entry start

include 'win32ax.inc'

section '.data' data readable writeable

sStr db "Num: %010u | %08X",10,0
divisor dd 2
arr db 50 dup 0

section '.code' code readable executable
start:

xor ecx,ecx ;ecx = 0
mov esi,arr ;esi now points to start of array

divloop:
xor edx,edx ;edx = 0

mov eax,ecx ;eax = count

div [divisor] ;div/2

mov byte [esi+ecx],dl ;move lower half of edx into esi+ecx (because modulus 2, it will be 1 or 0 so we can cheat)
                      ;if you're wondering why esi+ecx, it's so we don't ahve ti inc esi every time, we just add the current count to it 

xor ebx,ebx ;ebx = 0
mov bl,byte [esi+ecx] ;save temporarily

;===Just me printing to the console, don't worry
push ecx
invoke printf,sStr,ebx,ecx ;print out result, you probably don't have to do this
add esp,12
pop ecx
;===Just me printing to the console, don't worry ^

inc ecx ;ecx+1
cmp ecx,50
jne divloop ; if ecx != 50 go to divloop

;console stuff again, not important v
invoke getchar

;=========Imports=================
section '.idata' import data readable writeable
library kernel,'KERNEL32.DLL',\
        msvcrt,'MSVCRT.DLL'
import kernel,\
       ExitProcess,'ExitProcess',\
       GetSystemTime,'GetSystemTime',\
       Sleep,'Sleep'
import msvcrt,\
       printf,'printf',\
       getchar,'getchar'

    

Also, very impressive build. However, on a simple program like:
...
it seems to treat the div instruction (I think) as imul. Also, when I specify "fasm syntax" and there are null values (00) they are still shown as ADD EAX,AL until the last one where it is treated as db 00.

This problem is easily solved by deleting you AV. Why put so much trust into something that doesn't work for many real viruses and blocks many legitimate programs?

I uploaded new version.

div [divisor] ;div/2

Foxxy

Quote:

div [divisor] ;div/2

Why not shr eax,1 ?
Div slow and not needed divisor dd 2.