rva macro

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mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 12 Jun 2010, 05:00

I can't find the definition of rva. I need something like this:

Code:

imgbase = $400000

org imgbase

macro rva address
{
   address-imgbase
}

dd rva needrvaofthislabel <---- Error: Invalid expression

...

needrvaofthislabel:

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12 Jun 2010, 05:00

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 12 Jun 2010, 05:25

The definition:("rva" is also mentioned in the COFF and ELF sections of the manual)

2.4.2 Portable Executable wrote:

The rva operator can be used inside the numerical expressions to obtain the RVA of the item addressed by the value it is applied to.

I wish I could explain it, but I don't know what an RVA is.

12 Jun 2010, 05:25

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 12 Jun 2010, 11:13

RVA only makes sense in context of PE file (and is used for similar purpose in ELF shared library IIRC). Not in pure binary.

What you want is called "inline macro", and FASM doesn't support it. Search forum for more info.

12 Jun 2010, 11:13

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 12 Jun 2010, 13:43

vid wrote:

RVA only makes sense in context of PE file (and is used for similar purpose in ELF shared library IIRC). Not in pure binary.

Well, it IS in the context of a PE file. A pure binary one.

Quote:

What you want is called "inline macro", and FASM doesn't support it. Search forum for more info.

So I'd have to do like this to achieve desired effect?

Code:

macro dwrva address
{
   dw address-imgbase
}

macro ddrva address
{
   dd address-imgbase
}  

macro orgup n,level
{
   org (((n+(level-1))/level)*level)
}

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12 Jun 2010, 13:43

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 13 Jun 2010, 21:22

Quote:

So I'd have to do like this to achieve desired effect?

Basically, yes.

However, it might be easier for typing & maintenace to overload every data directive using some form of "irp" with a common macro that checks for pseudo-operator (probably not "rva", as it is an existing operator already). Sorry, no time to write one right now.

13 Jun 2010, 21:22

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 13 Jun 2010, 21:25

Either that, or I can type somethingsomething-imgbase at a few places Razz

13 Jun 2010, 21:25

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 13 Jun 2010, 21:54

mindcooler,

If you like to stick with rva name syntax, rva equ -imgbase+ can be useful.

13 Jun 2010, 21:54

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 14 Jun 2010, 02:14

baldr wrote:

mindcooler,

If you like to stick with rva name syntax, rva equ -imgbase+ can be useful.

That's nice, perhaps I'll go with such a solution.

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14 Jun 2010, 02:14

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