Cheat Engine

[SanderE1]

I would like to make a script that would take the amount of damage i take and divide it by 2, how or is it possible? is there a opcode for division?

[ParkourPenguin]

Look at any mnemonic containing "div" here. Beyond that, you're going to need to be more specific: what data type is it? What instruction is accessing it? What instructions lead up to the write to the address?

[SanderE1]

I'm fairly new to cheat engine i don't quite know what you mean.


sub [edx+00000340],eax

how would i divide "eax" by 2?

Full script(terraria)


define(address,11A80E22)
define(bytes,29 82 40 03 00 00)
[ENABLE]
assert(address,bytes)
alloc(newmem,$1000)
label(code)
label(return)
newmem:
code:
sub [edx+00000340],eax
jmp return
address:
jmp newmem
nop
return:
[DISABLE]
address:
db bytes
dealloc(newmem)

[FreeER]

You'd probably be better off here without more info https://www.google.com/search?q=assembly+divide

but since I'm feeling nice and I don't actually have anything to do right this moment... there are 3 situations I can think of off the top of my head

1. It's an typical 4-byte value / integer
2. It's a floating point (float/double) using the fpu (fld/fst(p))
3. It's a floating point (float/double) using SSE / xmmX registers

1.1 shr eax, 1, Since it's a divide by 2 you can just shift the value right, so if you had 1000 in binary (1*2^3 = 8 ) and shift it right by 1 bit it'll become 0100 (1*2^2 = 4). The same works for any power of 2 (2^0, shift by 0 bits, 2^1 (2) shift by 1 bit, 2^X shift by X bits), left shift will make each bit more meaningful (larger) and thus multiply while right shift will make them smaller and thus divide.

1.2 there are div (unsigned) and idiv (signed) instructions just like there are mul (unsigned) and imul (signed) instructions. Basically these implicitly use edx:eax (edx as top 32 bits, eax as low 32 bits, use cdq to sign extend eax into edx) as the value to be divided and you give it the register/address to divide by with the result going in eax and the remainder in edx but it's kind of confusing if you deal with multiple sizes so see http://www.c-jump.com/CIS77/MLabs/M11arithmetic/M11_0120_idiv_instruction.htm

[SanderE1]

Thank you sir! sorry for taking up your time.