Macro something like "MOV EAX, EXTEND_INT(0x1000)"

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 20 Dec 2016, 12:00

Hi,

Is it possible to use a macro (or similar construction) inside an instruction? For example, imagine that I want to create a special value from a given integer. Example:

Code:

MOV EAX, MAKE_SPECIAL_INT(0x1000)

I have created something like:

Code:

macro MAKE_SPECIAL_INT value
{
    0xFFFF0000 + value
}

But FASM says "extra caracters on line". Is there any workaround to accomplish that?

Thanks!

20 Dec 2016, 12:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20630
Location: In your JS exploiting you and your system

revolution 20 Dec 2016, 13:15

fasm doesn't support inline macros. You will need to override the MOV instruction and detect the special values inside that.

20 Dec 2016, 13:15

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 20 Dec 2016, 17:43

Thanks revolution. No problem, I will use another workaround

Thanks!

20 Dec 2016, 17:43

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