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data management help : byte ptr

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Fresco
Grandmaster Cheater

Reputation: 4

Joined: 07 Nov 2010
Posts: 600

Posted: Thu Nov 22, 2012 10:17 am Post subject: data management help : byte ptr

i have a structure, however it doesn't have a static base address.

Code:

dec [eax]

eax can be more than 4/5 addresses in the same object
i mean that for example eax ca be:
0A98B300
0A98B304
0A98B308 etc...
now for the code, instead of comparing eax's offsets eax+4, eax+8, i want to compare whether eax ends with 00 or 04 or 08.
how do i do that? or what's the instruction that returns the last byte of a register ?
byte ptr ? how do i use it ?

Code:

mov byte ptr ebx,eax

doesn't work. thanks for your help
_________________

... Fresco

Gniarf
Grandmaster Cheater Supreme

Reputation: 43

Joined: 12 Mar 2012
Posts: 1285

Posted: Fri Nov 23, 2012 1:29 am Post subject: Re: data management help : byte ptr

Fresco wrote:

i want to compare whether eax ends with 00 or 04 or 08.
how do i do that?

Code:

cmp al,0
je WhatToDoIfEAXEndsWith0
cmp al,4
je WhatToDoIfEAXEndsWith4
cmp al,8
je WhatToDoIfEAXEndsWith8

Fresco wrote:

what's the instruction that returns the last byte of a register ?

If you wanna do it with an instruction, I suppose you could use some masking:

Code:

//here eax=12345678
and eax,FF //eax=00000078
cmp eax,0
je WhatToDoIfEAXEndsWith0
cmp eax,4
je WhatToDoIfEAXEndsWith4
cmp eax,8
je WhatToDoIfEAXEndsWith8

Fresco wrote:

byte ptr ?

Nope

Fresco wrote:

how do i use it ?

byte prt is a modifier that you can only use in front of an address (like mov byte ptr [1000],eax). It specifies how much data to read/write at the specified memory location.
The "ptr" keyword is optional and does not change anything.

Fresco
Grandmaster Cheater

Reputation: 4

Joined: 07 Nov 2010
Posts: 600

Posted: Fri Nov 23, 2012 12:24 pm Post subject:

Thank you very much:) _________________ ... Fresco

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