Repeat instruction in macro, according to macro parameter

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 28 Apr 2017, 16:04

Hi,

I was wondering if I can create a macro that work like this:

MY_MACRO param

Where I generate the following:

MY_MACRO 1 ---> it will generate:

Code:

PUSH EAX

MY_MACRO 2 ---> it will generate

Code:

PUSH EAX
PUSH EAX

MY_MACRO 3 ---> it will generate:

Code:

PUSH EAX
PUSH EAX
PUSH EAX

MY_MACRO n ---> it will generate:

Code:

PUSH EAX
....
....
PUSH  EAX   ; this is the "n" time

Thanks!

28 Apr 2017, 16:04

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20335
Location: In your JS exploiting you and your system

revolution 28 Apr 2017, 16:13

Code:

macro MY_MACRO x {
  repeat x
    push eax
  end repeat
}

28 Apr 2017, 16:13

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 28 Apr 2017, 16:59

Thanks revolution! You made my day again! Smile

28 Apr 2017, 16:59

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20335
Location: In your JS exploiting you and your system

revolution 28 Apr 2017, 17:19

You're welcome. Macros in fasm can be tricky things. But one thing to realise here is that repeat is executed at assembly time. There is another option using rept for preprocessor time execution.

28 Apr 2017, 17:19

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 02 May 2017, 00:36

revolution wrote:

repeat is executed at assembly time, rept at preprocessor time

So which stage is times?

Code:

times 3 movsb
times 4 : shr ax,1

It's mentioned right before repeat in the manual, so I assume they are similar.

02 May 2017, 00:36

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20335
Location: In your JS exploiting you and your system

revolution 02 May 2017, 04:02

times is assembly time evaluation.

02 May 2017, 04:02

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