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assebly code hacking

 
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pharaon
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PostPosted: Fri Jan 05, 2018 5:05 pm    Post subject: assebly code hacking Reply with quote

how can i freeze the value of this code, and if some one can explain to me what is xorps
i know xmm6 and xmm0 are registers but how can i mov 0 value to xmm0

subss xmm6,xmm0
xorps xmm10,xmm10
jmp return
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OldCheatEngineUser
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PostPosted: Fri Jan 05, 2018 5:40 pm    Post subject: Reply with quote

xorps is the bitwise XOR, but its exclusive for packed xmm registers.

it your case case xmm10 will be '0' float after the xorps. (all four packed float values)


there is different ways to move 0 into xmm0:

- subss xmm0,xmm0
- pxor xmm0,xmm0
- movss xmm0,xmm X // note moving another xmm register that contain 0 // you use: movss xmm0,xmm10 after xorps xmm10,xmm10
- movss xmm0,[myNewValue] // myNewValue = dd 0

there is more .. but not in my head atm ..

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pharaon
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PostPosted: Fri Jan 05, 2018 6:05 pm    Post subject: Reply with quote

thanks lot
but i'm still noob
hope you can explain more
alsot what about this code
cvttss2si eax,xmm1
mov [r8+00000358],eax

i want to understand what is cvttss2si eax,xmm1
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TheyCallMeTim13
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PostPosted: Fri Jan 05, 2018 6:18 pm    Post subject: Reply with quote

I can't remember the exact nomenclature of it, but "cvttss2si" is like convert single scalar float to double word signed integer, so it just takes a float and converts it to an integer.
Then "mov" is just a basic move, or set.

So "[{so address}] = eax = convert ( xmm1 )".

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OldCheatEngineUser
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PostPosted: Fri Jan 05, 2018 6:59 pm    Post subject: Reply with quote

yeah it do convert it to signed dword. (float to dword)
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pharaon
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PostPosted: Sat Jan 06, 2018 8:27 am    Post subject: Reply with quote

and how can i cheat such code
cvttss2si eax,xmm1
mov [r8+00000358],eax

it's responsible about increasing my money value
if i want to increase t each time with fixed value like 1000
how can i do that
i don't know how to use inc with fixed amount
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OldCheatEngineUser
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PostPosted: Sat Jan 06, 2018 8:50 am    Post subject: Reply with quote

Code:
cvttss2si eax,xmm1
mov eax,[r8+00000358]
add word ptr eax,03e8
mov [r8+00000358],eax

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pharaon
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PostPosted: Sat Jan 06, 2018 8:54 am    Post subject: Reply with quote

OldCheatEngineUser wrote:
Code:
cvttss2si eax,xmm1
mov eax,[r8+00000358]
add word ptr eax,03e8
mov [r8+00000358],eax


can you explain this line

add word ptr eax,03e8

i know 3e8 is 1000 in hex
but why word ptr
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OldCheatEngineUser
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PostPosted: Sat Jan 06, 2018 8:58 am    Post subject: Reply with quote

the final result will be the same, here i just specified the length.

dword = 0000 0000 hex
word = xxxx 0000 <- it adds the 1000 here

there is no difference, add eax,3e8 or add (d)word ptr eax,3e8

i just mixed up things:
btw its my bad, add word ptr eax,3e8 wont work
the reason: because its not referring to memory location (e.g. [eax] )

Code:
just use add eax,3e8

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TheyCallMeTim13
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PostPosted: Sat Jan 06, 2018 10:18 am    Post subject: Reply with quote

You can also use just the AX registry to access the lower word of the EAX registry.

See: Assembler - Structure

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pharaon
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PostPosted: Sat Jan 06, 2018 5:26 pm    Post subject: Reply with quote

what about this code
mov [eax],ebx
jne StrongholdBase.StrongholdBase::operator>>+3D2
mov eax,[edi+0000039C]
jmp return

it's responsible for increase/decrease the inventory images in Stronghold Crusader 2 stockpile but not the real value

so how can i hack it so it won't decrease

i already hack the real value so i always have stock even if the stockpile looks empty

but i want to hack this one so it wont look empty
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Csimbi
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PostPosted: Thu Jan 11, 2018 12:08 pm    Post subject: Reply with quote

Dude,
are you going to ask each ASM instruction?
Google for this:
Quote:
Intel 64 Instruction Set Reference, A-Z

Download PDF and find out yourself.
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