virtual with forward error

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CandyMan

Joined: 04 Sep 2009
Posts: 414
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 03 Feb 2023, 19:09

Code:

;
        xor     [Flags-ebp],1
;
virtual at ebp
Flags      db ?
ASize:
end virtual
;

display: invalid address

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03 Feb 2023, 19:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 03 Feb 2023, 19:17

You can do this:

Code:

;
if defined Flags
        xor     [Flags-ebp],1
end if
;
virtual at ebp
Flags      db ?
ASize:
end virtual
;

03 Feb 2023, 19:17

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8367
Location: Kraków, Poland

Tomasz Grysztar 03 Feb 2023, 19:24

Works with fasmg, though.

03 Feb 2023, 19:24

CandyMan

Joined: 04 Sep 2009
Posts: 414
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 03 Feb 2023, 20:35

Thanks.

03 Feb 2023, 20:35

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 04 Feb 2023, 04:46

Tomasz Grysztar wrote:

Works with fasmg, though.

I get a different result with fasmg.

Code:

~ fasmg virtualforward.asm 
flat assembler  version g.igd4j
virtualforward.asm [2]:
        xor [Flags-ebp],1
Processed: xor [Flags-ebp],1
Error: illegal instruction.

fasmg doesn't know what xor is.

04 Feb 2023, 04:46

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8367
Location: Kraków, Poland

Tomasz Grysztar 04 Feb 2023, 08:27

Of course, unless you include the instruction set for the right CPU. Nothing new here.

04 Feb 2023, 08:27

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