struc macro and label ?

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Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 21 Jun 2024, 14:10

Fasmw 1.73

Code:

macro kuu [arg] {
      if arg eqtype 0.0
      display '1.0;'
      end if
      if arg eqtype label  ;this not work or address too
      display '!;'
      end if
      if arg eqtype 1
      display '1;'
      end if
      }
section '.code' code readable writeable executable
      
      struc aff [args]  {  kuu args }

;in data
        terr  aff  1.0,2,3,e1
e1: dd 1,2,3

I not see '!'.
But work fine "1.0" and "1"

21 Jun 2024, 14:10

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 21 Jun 2024, 15:44

Maybe this only works for ELF?

Code:

format _FORMAT

macro foo x {
        if x relativeto $
                display `x,' label',13,10
        else if x eqtype 0
                display `x,' number',13,10
        end if
}

a: 
b=0

foo a
foo b

Code:

~ fasm test.asm -d _FORMAT=pe
flat assembler  version 1.73.31  (16384 kilobytes memory)
a label
b label
1 passes, 512 bytes.

~ fasm test.asm -d _FORMAT=elf
flat assembler  version 1.73.31  (16384 kilobytes memory)
a label
b number
1 passes, 268 bytes.

21 Jun 2024, 15:44

Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 24 Jun 2024, 09:53

Why in ELF format relativeto correct work, but in PE not?
Bug?

24 Jun 2024, 09:53

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 24 Jun 2024, 10:21

If the condition is changed to test both options

Code:

format _FORMAT

macro foo x {
        if x relativeto $
                display `x,' label',13,10
        end if
        if x eqtype 0
                display `x,' number',13,10
        end if
}

a: 
b=0

foo a
foo b

Code:

~ fasm test.asm -d _FORMAT=pe 
flat assembler  version 1.73.31  (16384 kilobytes memory)
a label
a number
b label
b number
1 passes, 512 bytes.

~ fasm test.asm -d _FORMAT=elf
flat assembler  version 1.73.31  (16384 kilobytes memory)
a label
a number
b number
1 passes, 268 bytes.

24 Jun 2024, 10:21

Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 24 Jun 2024, 11:46

I get in PE:
1.0 label
1.0 number

2 label
2 number

e1 label
e1 number

But its wrong result.

24 Jun 2024, 11:46

Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 24 Jun 2024, 13:18

How work proc macro ?

proc a1
Ret
endp

I mean apply to name something like .label or .proc or .address ?

24 Jun 2024, 13:18

ProMiNick

Joined: 24 Mar 2012
Posts: 798
Location: Russian Federation, Sochi

ProMiNick 25 Jun 2024, 09:47

Tomasz, Is fasmcore could be patched this way so any $ symbol would be always threated as relocateble no matter relocateble output format or not?

Roman, in case of PE format add at end:

Code:

virtual
data fixups
end data
end virtual
dd 0,8

price is 8 bytes, but symbol $ will start acts like relocatable
(in case of already present fixups section or data my one is not needed)

25 Jun 2024, 09:47

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 25 Jun 2024, 10:11

Why use virtual?

Is it bad to use it normally?

Code:

data fixups
dd 0,8
end data

25 Jun 2024, 10:11

ProMiNick

Joined: 24 Mar 2012
Posts: 798
Location: Russian Federation, Sochi

ProMiNick 25 Jun 2024, 12:18

Why use virtual? because virtual block is good place for reloc data in case of unwanted reloc table combined with all goodies of symbol $ unrelated to 0 that reached only in relocatable file formmats.

25 Jun 2024, 12:18

Roman

Joined: 21 Apr 2012
Posts: 1766

Roman 08 Jul 2024, 14:03

Quote:

data fixups
dd 0,8
end data

https://stackoverflow.com/questions/37829732/how-to-use-the-fixups-attribute-on-a-section

08 Jul 2024, 14:03

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