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Index > Compiler Internals > virtual with forward error

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CandyMan



Joined: 04 Sep 2009
Posts: 412
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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Post 03 Feb 2023, 19:09
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20123
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
;    
Post 03 Feb 2023, 19:17
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 8344
Location: Kraków, Poland
Tomasz Grysztar 03 Feb 2023, 19:24
Works with fasmg, though.
Post 03 Feb 2023, 19:24
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CandyMan



Joined: 04 Sep 2009
Posts: 412
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan 03 Feb 2023, 20:35
Thanks.
Post 03 Feb 2023, 20:35
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20123
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.
Post 04 Feb 2023, 04:46
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 8344
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.
Post 04 Feb 2023, 08:27
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