Hi everyone !
First of all, please excuse my English, I'm foreigner...
I'm just beginning with MASM. I aim to write a .dll file which contains only one procedure. This procedure should interchange the contents of two Bytes, which will be arguments of the procedure. I wrote this code :
.386
.model flat, stdcall
option casemap: none
.code
start:
echange PROC p1: PTR, p2: PTR
mov eax, p1
mov ebx, p2
mov p1, ebx
mov p2, eax
ret
echange endp
end start
Could you please tell me whether this code is good ?
Thank you very much ! :U
Your procedure only change the arguments p1 and p2, which will be discarded when the procedure returns.
echange PROC uses ebx p1: PTR BYTE, p2: PTR BYTE
mov eax, p1
mov ebx, p2
mov dl,BYTE ptr [eax]
mov dh,BYTE ptr [ebx]
mov BYTE ptr [ebx],dl
mov BYTE ptr [eax],dh
ret
echange endp
welcome to the forum :U
i think we just had this discussion :P
the forum search tool can answer some questions for you
http://www.masm32.com/board/index.php?topic=18309.0
@qWord: Thank you for your answer !
@dadndave : ok, next time I first search in the forum.
Bye !