Randomly select a macro MASM

[Activia]

Hello,
How to make a macro that chose one of two macros without arguments ?
Thank you !

Useless example :

Code Select Expand


mov eax, 1
mov ebx, 2
mov edi, 3
mov esi, 4
random ; macro chosen macro_1 or macro_2 without argument
invoke sleep, 1000


Code Select Expand


random macro
  ; macro chosen macro_1 or macro_2 or macro_3 or ....
endm

macro_1 macro
  push eax
  push ebx
endm

macro_2 macro
  push esi
  push edi
endm

[dedndave]

Hi Activia,
welcome to masm32 forum
i would use QueryPerformanceCounter to get a timer value
take the least signifigant bit and use that to select the macro for you

        push    eax
        sub     esp,8
        INVOKE  QueryPerformanceCounter,esp
        pop     eax
        pop     edx
        and     al,1
        pop     eax
        jz      ChoosePair1

ChoosePair0:
        push    eax
        push    ebx
        jmp short PairChosen

ChoosePair1:
        push    esi
        push    edi

PairChosen:
.
.
.

[Activia]

Thank you :p but it's not that.

Sorry, I had difficulty explaining.
I don't want add code... 100% random macro

Example after compilation :

Code Select Expand


mov eax, 1
mov ebx, 2
mov edi, 3
mov esi, 4
RANDOM ; this macro chosen macro_1 or macro_2 without argument


AFTER COMPILATION :

mov eax, 1
mov ebx, 2
mov edi, 3
mov esi, 4
PUSH EAX   ; RANDOM macro chose macro_1
PUSH EBX


OR

mov eax, 1
mov ebx, 2
mov edi, 3
mov esi, 4 
PUSH ESI  ; RANDOM macro chose macro_2
PUSH EDI




[MichaelW]

I'm not sure what you are asking for, but perhaps this will do what you want:

http://www.masm32.com/board/index.php?topic=9018.0

[dedndave]

I'm not sure what you are asking for

me either - i thought i understood - lol
i wonder if he (or she) tried my code - lol
many people may not realize that QueryPerformanceCounter spits out more or less pseudo-random stuff

but, i see no need for use of the stack for these values
and, i see no need for use of macros
so, either we are not getting the big picture, or it is more complicated than it needs to be

Activia, if you tell use what you want the end result to be and what you are using it for, we may be able to simplify it for you

[Activia]

I have a sample in NASM.
I want the same code in MASM.

The guy use "nasmw.exe -w-number-overflow -fobj -dkey=%key% -O3 %name%.asm " for choose randomly macros.

So, I can use "/c /coff /Cp /nologo /DRANDOM=%key%

Thank you for you link MichaelW and thank you dedndave ;)

[attachment deleted by admin]

[NightWare]

hmm, a compiler isn't supposed to make random choice... it could be used to generate many files doing the same thing with differents signatures, possibly interesting for app/video game to avoid patchs (but disallow a possible update later). now i also see another usage, but you don't want to do that ! do you ?

anyway, where is the interest to "protect" your code like that ? if you have read the french doc included, IT DOES EXACTLY THE SAME THING. you should better use a key/crypting method (plus, here updates will be possible). here an example (code in french) : http://www.masm32.com/board/index.php?topic=8429.0

[dedndave]

if it smells like a fish and flaps its tail....
prolly a fish

[Activia]

LOL, it's not for virus !

Yes, my sample NASM is confusing lol... but I am interested in the random choice when compiling.

if you have read the french doc included, IT DOES EXACTLY THE SAME THING.

Yes yes, that's why I do not want to encrypt my code ;)

Code Select Expand

hmm, a compiler isn't supposed to make random choice...

hmm, this code works to start :

Code Select Expand

@ECHO OFF
SET h1=%time:~0,1%
SET h2=%time:~1,1%
SET m1=%time:~3,1%
SET m2=%time:~4,1%
SET s1=%time:~6,1%
SET s2=%time:~7,1%
SET c1=%time:~9,1%
SET c2=%time:~10,1%

SET j1=%date:~0,1%
SET j2=%date:~1,1%
SET m1=%date:~3,1%
SET m2=%date:~4,1%

SET a1=%date:~6,1%
SET a2=%date:~7,1%
SET a3=%date:~8,1%
SET a4=%date:~9,1%

SET key=%c1%%s2%%c2%%c1%%m2%%c2%%j2%%m2%

@ECHO ON
C:\masm32\bin\ml.exe /c /coff /Cp /nologo /DRANDOM=%key%  "Body.asm"
C:\masm32\bin\link.exe  /SUBSYSTEM:WINDOWS /RELEASE /VERSION:4.0 body.obj

del *.obj
pause



Code Select Expand

testm macro

ifndef RANDOM
mov eax, 1
else
mov eax, RANDOM
endif
PrintDec eax

endm

[jj2007]

If you want it at assembly time, there is not much choice. Here is one:

Code Select Expand

include \masm32\include\masm32rt.inc

random MACRO
  if @Line and 1
print "Very odd!", 13, 10
  else
print "Even that one works", 13, 10
  endif
ENDM

.code
start:
random
nop
random
random
random
nop
random
random
random
getkey
exit

end start