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[SOLVED] Modify XMM registers

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aikoncwd
Grandmaster Cheater

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Joined: 21 Dec 2012
Posts: 591
Location: Spain (Barcelona)

Posted: Wed Jan 07, 2015 11:54 am Post subject: [SOLVED] Modify XMM registers

Hi

I have a game that uses XMM registers to handle Health. The instruction that modify enemy health is 07F54B17

Code:

07F54AFB: F3 0F 7E 87 78 01 00 00 - movq xmm0,[edi+00000178]
07F54B03: F3 0F 7E 8D 60 FF FF FF - movq xmm1,[ebp-000000A0]
07F54B0B: 66 0F D6 8D D0 FE FF FF - movq [ebp-00000130],xmm1
07F54B13: F2 0F 5C C1 - subsd xmm0,xmm1
// ---------- INJECTING HERE ----------
07F54B17: 66 0F D6 87 78 01 00 00 - movq [edi+00000178],xmm0
// ---------- DONE INJECTING ----------
07F54B1F: 8B 05 58 02 6E 0E - mov eax,[0E6E0258]
07F54B25: 83 EC 04 - sub esp,04

I want to set xmm0 = 0 before 07F54B17 is executed, I tried this:

Code:

mov xmm0,(double)0 //can't be compiled
movq xmm0,(double)0 //can't be compiled
movss xmm0,(double)0 //can't be compiled
movq [edi+00000178],xmm0

I didn't tried the 3 instructions at the same time, any of this instructions can't be compiled... how can I set values to XMM registers?

Other possible way is set xmm1 = 99999999 so this will be a "1 hit kill", but I have the same problem lol

Thanks! Razz

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Last edited by aikoncwd on Wed Jan 07, 2015 12:21 pm; edited 1 time in total

DDS
Expert Cheater

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Joined: 10 Feb 2011
Posts: 112
Location: Bill's Planet

Posted: Wed Jan 07, 2015 12:12 pm Post subject:

Para cambiar el registrador xmm0 a 0 trata lo siguiente.

Code:

xorps xmm0,xmm0

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elDarkDragonSlayer

aikoncwd
Grandmaster Cheater

Reputation: 23

Joined: 21 Dec 2012
Posts: 591
Location: Spain (Barcelona)

Posted: Wed Jan 07, 2015 12:15 pm Post subject:

elDDS wrote:

Para cambiar el registrador xmm0 a 0 trata lo siguiente.

Code:

xorps xmm0,xmm0

Thanks! (gracias!)

Anyway, I get the solution:

Code:

[ENABLE]

aobscan(DoDMG,FF F2 0F 5C C1 66 0F D6 87 78 01 00 00) // should be unique
alloc(newmem,$1000)

label(code)
label(return)
label(enemy)
globalalloc(pEnemy,4)
label(new)
label(nein)
newmem:

code:
cmp edi,[Health]
jne enemy
movq xmm0,[new]
movq [edi+00000178],xmm0
jmp return

enemy:
mov [pEnemy],edi
movq xmm0,[nein]
movq [edi+00000178],xmm0
jmp return

new:
dq (double)500

nein:
dq (double)0

DoDMG+05:
jmp code
nop
nop
nop
return:
registersymbol(DoDMG)

[DISABLE]

DoDMG+05:
db 66 0F D6 87 78 01 00 00

unregistersymbol(DoDMG)
dealloc(newmem)

So I need o store the value in a label and use movq for double or movss for float. Is this OK?

Razz

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DDS
Expert Cheater

Reputation: 3

Joined: 10 Feb 2011
Posts: 112
Location: Bill's Planet

Posted: Wed Jan 07, 2015 12:33 pm Post subject:

Si el script se compila bien sin ningun error. Entonces si esta bien. _________________ elDarkDragonSlayer

mgr.inz.Player
I post too much

Reputation: 222

Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00

Posted: Wed Jan 07, 2015 6:20 pm Post subject:

AikonCWD wrote:

So I need o store the value in a label and use movq for double or movss for float.

For single-precision floating-point use movss, movd

For double-precision floating-point use movsd, movq

Of course, there are other ways:
cvtsi2ss xmm0,eax // will convert signed integer from EAX to single
cvtsi2sd xmm0,eax // will convert signed integer from EAX to double
cvtss2sd xmm0,xmm0 // will convert single to double
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