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Multiplication of XMM registers not working as I expect

 
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Sp4rt
How do I cheat?
Reputation: 0

Joined: 28 May 2020
Posts: 8
PostPosted: Sun Jun 07, 2020 4:10 pm    Post subject: Multiplication of XMM registers not working as I expect Reply with quote
I'm trying to do a simple damage multiplicator cheat, and so far I got this:

Code:
[ENABLE]
aobscanregion(INJECT,Enemy:DealDamageToEnemy+1eb,Enemy:DealDamageToEnemy+3eb,F2 0F 5C C1 48 8B C8)
alloc(newmem,2048,INJECT)
label(returnhere)
label(exit)
alloc(DMGMult,4)
registersymbol(DMGMult)
registersymbol(INJECT)

DMGMult:
dd (double)2.0

newmem:
  mulsd xmm1,[DMGMult] // should multiply by 2 but multiplies by 0

originalcode:
  subsd xmm0,xmm1 // xmm0 is the enemy health value

exit:
jmp returnhere

INJECT:
jmp newmem
nop
nop
returnhere:
registersymbol(INJECT)

[DISABLE]


My problem is that the mulss instruction is multiplying by 0 for some reason I still don't understand. I know it's multiplying by 0 because 1) I'm not doing any damage and 2) if I do
Code:
 mulss xmm0, [DMGMult]
the enemies die instantly. Any help will be appreciated.
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ParkourPenguin
I post too much
Reputation: 152

Joined: 06 Jul 2014
Posts: 4702
PostPosted: Sun Jun 07, 2020 6:06 pm    Post subject: Reply with quote
dd = define doubleword (4 bytes); dq = define quadword (8 bytes). A double takes up 8 bytes. Allocate 8 bytes for DMGMult and change dd to dq.
_________________
I don't know where I'm going, but I'll figure it out when I get there.
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Sp4rt
How do I cheat?
Reputation: 0

Joined: 28 May 2020
Posts: 8
PostPosted: Mon Jun 08, 2020 1:36 pm    Post subject: Reply with quote
That was it. Thank you ParkourPenguin
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