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Index > Macroinstructions > Converting macro from masm

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prana



Joined: 28 Aug 2003
Posts: 51
prana
I've a pair of macros like the following written for masm:

return macro
___ret =$
ret
endm

rz macro
if $-___ret gt 126
jnz $+3
___ret = $
ret
else
jz ___ret
endif
endm


How this can be recoded for fasm, without using any .if macro?
Also if I use it, how the listing should look like?

Thanks for your help.
Post 03 Oct 2003, 17:45
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prana



Joined: 28 Aug 2003
Posts: 51
prana
I was testing it like this:
____________________________________

macro return
{
___ret =$
ret
}

macro rz
{ push ax
mov al,126
cmp al,($-___ret)
jnz $+3
___ret =$
ret
jz ___ret
}

org 100h

main:
mov al,0
cmp al,0
rz
__________________________________________________


However, running this program causes an NTVDM error.

Any help?
Post 04 Oct 2003, 06:16
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7498
Location: Kraków, Poland
Tomasz Grysztar
You can compare two absolute values at the assembly time, like "if $-__ret>126", and the run-time comparision makes completely no sense for such kind of macro. However, even the original macro for masm seems a bit wrong for me, but I'm not sure how masm will react for such ambiguous situations, when you try to check value of some constant that was not defined yet in a way to determine whether define it or not (fasm won't let you do such things, because they are creating a mess). The correct version for fasm should look like:
Code:
macro return
{
 ___ret = $
 ret
}

macro rz
{
 if defined ___ret
  if $-___ret > 126
   jnz $+3
   ___ret = $
   ret
  else
   jz ___ret
  end if
 else
  jnz $+3
  ___ret = $
  ret
 end if
}    
Post 04 Oct 2003, 10:20
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prana



Joined: 28 Aug 2003
Posts: 51
prana
yes, got it!
Thanks boss! However I missed the last "ret " in my previous posting:
It was like:


______

.......
.....
org 100h

main:
mov al,0
cmp al,0
rz
ret

_____________

Thanks! Very Happy
Post 04 Oct 2003, 20:16
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