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NanoBytes



Joined: 02 Jun 2011
Posts: 57
Location: Iowa, United States
NanoBytes 11 Jun 2011, 08:37
Ok, I'm not sure whether or not the question I have is difficult or not. Ok I have two variables:
Code:
X DW 5
Y DD 10

The psudocode for what i want is:
Code:
Y=X
or
DOUBLE=WORD

This in and of itself is not difficult, my problem is that I need a kill all for the following problem:
I only have the names of the two variables, and the data type of the seconed. So the kill all would work just as well for A=B as it would for Y=X (all I need to do is plug the names in and then the seconed would be moved to the first.
so:
Code:
Var1 = conversion(Var2_Type, Var2)

So back to the X,Y example. Y will equal X no matter what type Y actualy is. For example, if this "kill all" is a procedure, I will pass the location of Var1,and 2 and the type of Var 2,
For the type passing, I was planning to use a character for that:
'B' = byte
'W' = word
'D' = double
ect...
Code:
something like:
LEA EAX,[Var1]
PUSH EAX
LEA EAX,[Var2]
PUSH EAX
call ConvertAndAssign

_________________
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keep to gain what he cannot loose.
Post 11 Jun 2011, 08:37
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20621
Location: In your JS exploiting you and your system
revolution 11 Jun 2011, 08:50
I think it goes a little bit further than that. You might need to consider signed and unsigned:
Code:
movzx eax,[X] ;is it this?
movsx eax,[X] ;or this?
mov [Y],eax
Post 11 Jun 2011, 08:50
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me239



Joined: 06 Jan 2011
Posts: 200
me239 11 Jun 2011, 18:45
aren't there instructions for this like cwd & cbw (convert word to doubleword and convert byte to word)?
Post 11 Jun 2011, 18:45
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