Get variable's raw offset

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booze

Joined: 24 Jul 2013
Posts: 2

booze 24 Jul 2013, 18:35

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 24 Jul 2013, 19:29

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 25 Jul 2013, 07:13

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 30 Jul 2013, 20:45

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

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