how count bits in macro ?

Index > Macroinstructions > how count bits in macro ?

Goto page Previous 1, 2

Author

Thread

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20625
Location: In your JS exploiting you and your system

revolution 07 May 2025, 11:27

That uses the code for ROL so the result is correct for ROL.

07 May 2025, 11:27

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 07 May 2025, 11:38

I want ror to.
ror(x,y)=[(x-(x mod (2^y))/(2^y)]+[[(x mod (2^y)]*(2^32-y)]

ror(x,y):
t1 = x >> y;
t2 = x << (bitsize - y );
ror = t1 | t2;

07 May 2025, 11:38

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 07 May 2025, 12:11

I do this variant for ror.
But its fixed for 6025 value

Code:

n = 12
      v = 6025
BIT_MASK = 0xFFFFFFFF ;0x7FFFFFFF
BIT_MASK2 = 0xffFFFFFF
__@v1 = ( BIT_MASK AND ( v shr (  1 + bsr BIT_MASK2 - n ))) OR ( BIT_MASK2 AND ( v shl n ))

mov edx,((__@v1) shl 4  +1)  and 0x0fffffff

I get 0x7890001 but must be 0x78900001

Code:

n = 12
      v = 6025
BIT_MASK = 0xFFFFFFFF ;0x7FFFFFFF
BIT_MASK2 = 0xffFFFFFF
__@v1 = ( BIT_MASK AND ( v shr (  1 + bsr BIT_MASK2 - n ))) OR ( BIT_MASK2 AND ( v shl n ))
 __@v1 =(__@v1) shl 4
mov edx,((__@v1) shl 4  +1)  and BIT_MASK2 ;= 0x78900001 right !

Code:

;ror
n = 12
      v = 6025
BIT_MASK = 0xFFFFFFFF ;0x7FFFFFFF
BIT_MASK2 = 0xffFFFFFF
__@v1 = ( BIT_MASK AND ( v shr (  1 + bsr BIT_MASK2 - n ))) OR ( BIT_MASK2 AND ( v shl n ))
mov edx,__@v1
uuu = __@v1 and (0xff000000) shr 19
uuu = uuu shr 12
mov esi,uuu
 __@v1 =(__@v1) shl 4
mov edx,((__@v1) shl 4  +  (uuu))  and BIT_MASK2 ;= 0x78900001 right !

07 May 2025, 12:11

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 07 May 2025, 15:30

I don't know right this solution or not. But result correct.

Code:

   n = 12
      v = 6025
BIT_MASK = 0xFFFFFFFF ;0x7FFFFFFF
BIT_MASK2 = 0xffFFFFFF
__@v1 = ( BIT_MASK AND ( v shr (  1 + bsr BIT_MASK2 - n ))) OR ( BIT_MASK2 AND ( v shl n ))
mov edx,__@v1
uuu = __@v1 and (0xff000000) shr 19
uuu = uuu shr 12
mov esi,uuu
 __@v1 =(__@v1) shl 4
mov edx,((__@v1) shl 4  +  (uuu))  and BIT_MASK2
__@v1 = ((__@v1) shl 4  +  (uuu))  and BIT_MASK2  + 126 + 12;+ __@v1

;rol
n = 23-14
__@reslt = ( BIT_MASK AND ( __@v1 shl ( 1 + bsr BIT_MASK - (n) ))) OR ( BIT_MASK AND ( __@v1 shr (n) ))
mov edx,(__@reslt shl 0 ) AND BIT_MASK2;+ 126 + 12 ;+ jjjj
PrintVal 'rol =',__@reslt ;get  0x0x45bc4800 = float 6025.0
      @FltMul  0x3c23d70a,__@reslt,ebx ;0.01*6025.0=float 60.25
      PrintVal 'float =',ebx          ;I get 0x42710000 = float 60.25

Last edited by Roman on 07 May 2025, 15:50; edited 1 time in total

07 May 2025, 15:30

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 07 May 2025, 15:45

Fasmw 1.73 must have ror,rol for using in macros.

07 May 2025, 15:45

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 08 May 2025, 14:54

mrol = rol edx,8

Code:

macro mrol v { 
         v1 = (v shl 8) and 0xffffffff
         v2 = (v shr 24)
         v3 = (v1 or v2) and 0xffffffff
         mov edx,v3
}

      mrol 0x10203040       ;=20304010
      mrol v3               ;=30401020
      mrol v3               ;=40102030
      mrol v3               ;=10203040

macro mrol1 v {  
         v1 = (v shl 1) and 0xffffffff
         v2 = (v shr 24) and 0xffffff0f
         v3 = (v1 or v2) 
         mov edx,v3
}
mrol1 0x10203040 
rept 7 {mrol1 v3} ;ok 0x20304010
rept 8  {  mrol1 v3 } ;incorrect result 0x30401018 must be 0x30401020

08 May 2025, 14:54

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 08 May 2025, 17:23

Code:

;work fine
macro mror v {  
         t = v and 1
         x = v shr 1
         x = x or (t shl 31)

         mov edx,x
}
;mrol work fine to 
macro mroll v { 
         t = v and (1 shl 31)
         x = v shl 1
         x = x or (t shr 31)  and 0xffffffff

         mov edx,x
}

08 May 2025, 17:23

Goto page Previous 1, 2

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum