Get variable's raw offset

Index > Macroinstructions > Get variable's raw offset

Author

Thread

booze

Joined: 24 Jul 2013
Posts: 2

booze

Hello,

is it possible in FASM get raw offset of a variable? I mean offset from the beginning of the physical file.

For example, I have a variable:

Code:

section '.data' data readable writeable
    var dd 0x00000001

If i write

Code:

section '.data' data readable writeable
    var dd 0x00000001
    var_offset dd var

var_offset will contain the VA of the var.

Also I can write

Code:

section '.data' data readable writeable
    var dd 0x00000001
    var_offset dd var - $$

Here var_offset will contain raw offset from the beginning of '.data' section. To get 'var' raw offset, I need to get '.data' PointerToRawData. How can I get it?

Thank you in advance, and excuse me my English.

24 Jul 2013, 18:35

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc

booze
Unfortunately, not possible. You can neither find the raw size of the header nor raw sizes of sections (because of possible uninitialized data at the end of sections).

I never needed this, but it still could be a nice feature to have. Like raw operator analogous to the rva operator.

_________________
Faith is a superposition of knowledge and fallacy

24 Jul 2013, 19:29

booze

Joined: 24 Jul 2013
Posts: 2

booze

l_inc
Thank you. Probably there is only one solution - patch the binary after assembling.

25 Jul 2013, 07:13

fasmnewbie

Joined: 01 Mar 2011
Posts: 555

fasmnewbie

I don't know what you meant by 'raw' offset but If you meant the starting address of the '.data' section then this is the way I always use.

section '.data' data readable writable
@myoffset:
;data declarations

mov eax, @myoffset

30 Jul 2013, 20:45

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum