fasmg question how transform output?

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Pashkov

Joined: 02 Dec 2023
Posts: 3

Pashkov 02 Dec 2023, 14:03

Is there a way to take all the previously generated data and transform it?
Like that

Code:

macro format.xorer?
        local code
        code::
        
        postpone
                restartout
                pos=0
                repeat sizeof code
                        load by:byte from code:pos
                        db by, by xor pos
                        pos = pos + 1
                end repeat
        end postpone
end macro

format xorer

org 0
        data_section:
        rb 256
        code_section:

section 0x0000
        db 12
        db 32 + data_section

section $+code_section
        dw 123 + $

02 Dec 2023, 14:03

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8354
Location: Kraków, Poland

Tomasz Grysztar 02 Dec 2023, 16:46

ORG and SECTION begin new addressing spaces, and the "code::" label applies only to the first one of these areas.

You could try something like:

Code:

macro format.xorer?
        local code
        postpone
                load code.content:$% from :0
                virtual at 0
                    code:: db code.content
                end virtual
                restartout
                repeat sizeof code, pos:0
                        load by:byte from code:pos
                        db by, by xor pos
                end repeat
        end postpone
end macro

But if your data length does not actually change, I recommend to just rewrite it in place:

Code:

macro format.xorer?
        local code
        postpone
                repeat $%, pos:0
                        load by:byte from :pos
                        store by xor pos:byte at :pos
                end repeat
        end postpone
end macro

02 Dec 2023, 16:46

Pashkov

Joined: 02 Dec 2023
Posts: 3

Pashkov 02 Dec 2023, 17:17

Thanks. Load from nothing is interesting.

SIZEOF doesn't work on label.
Fixed code

Code:

macro format.xorer?
        local code
        postpone
                load code.content:$%% from :0
                virtual at 0
                    code:: db code.content
                    code.length = $
                end virtual
                restartout
                repeat code.length, pos:0
                        load by:byte from code:pos
                        db by, by xor pos
                end repeat
        end postpone
end macro

02 Dec 2023, 17:17

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8354
Location: Kraków, Poland

Tomasz Grysztar 02 Dec 2023, 17:33

Pashkov wrote:

SIZEOF doesn't work on label.

It should work. I tested my macro before posting, and the size was processed correctly there. Perhaps you have something else interfering?

02 Dec 2023, 17:33

Pashkov

Joined: 02 Dec 2023
Posts: 3

Pashkov 03 Dec 2023, 13:00

Problem finded in versions. I used jz27. SIZEOF return 0. After update to k4v8 SIZEOF work normaly

03 Dec 2023, 13:00

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8354
Location: Kraków, Poland

Tomasz Grysztar 03 Dec 2023, 13:47

This feature was added in k0v2.

03 Dec 2023, 13:47

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