Mutable code. Problem with size.

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Index > Macroinstructions > Mutable code. Problem with size.

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Roman

Joined: 21 Apr 2012
Posts: 1847

Roman 11 Jun 2024, 08:27

Fasmw 1.73

Code:

Virtual at 0
Code1:: inc dword [.data]
.data dd 0,1,2,3


Code2:: add dword [.data],2
.data dd 0,1,2,3

Code3:: sub dword [.data],4
.data dd 0,1,2,3
end virtual  

;in code
muk = Code1.data-Code1 ;fasm get error ! Invalid use of symbol.
        repeat  muk
                 load dc byte from Code1:%-1
                 db dc
                 end repeat

11 Jun 2024, 08:27

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 11 Jun 2024, 09:39

Code1 and Code2 and Code3 are all the same value.

You need to define offsets separately.

Code:

Virtual at 0
Code::  ; <--- only one label needed for load/store

;define a base label for the offsets
my_stuff:
.code1: inc dword [.data1]
.data1 dd 0,1,2,3

.code2: add dword [.data2],2
.data2 dd 0,1,2,3
end virtual
;...
muk = my_stuff.data1 - my_stuff.code1

11 Jun 2024, 09:39

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