a bug with macro

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litwr

Joined: 23 Aug 2005
Posts: 11
Location: Moscow, Russia

litwr 07 Nov 2014, 19:08

Code:

format ELF64 executable 3
macro instring s {
        mov     rdx,str#s#maxlen
}
        instring 1
string1 rb      256
string2 rb      128
str1maxlen equ string2-string1

This doesn't work (error: undefined symbol 'str1maxlen') Sad

but this

Code:

str1maxlen equ string2-string1
macro instring s {
        mov     rdx,str#s#maxlen
}
        instring 1
string1 rb      256
string2 rb      128

works... IMHO this maybe resolved by more passes.

07 Nov 2014, 19:08

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20461
Location: In your JS exploiting you and your system

revolution 07 Nov 2014, 19:37

Use "str1maxlen = string2-string1" instead of equ. This way the you use the assembler to compute the value instead of the preprocessor to define a symbol.

07 Nov 2014, 19:37

litwr

Joined: 23 Aug 2005
Posts: 11
Location: Moscow, Russia

litwr 08 Nov 2014, 06:04

Thanks!

08 Nov 2014, 06:04

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