Cheat Engine

sandsmaster · Newbie cheater Reputation: 1 Joined: 21 Jan 2021 Posts: 24

Hi everyone again.

This time I'm trying to cheat in overcooked 2. The cheat is simple: When I serve a dish, I have to wait for 10 sec to get the dirty
plate back, in a sink.
I'm trying to set the timer to 0, so I can get the clean plates instantly. I haven't really read about FPU stack much, so I don't know anything about ST(n), but I think this is an odd situation, so I though I'd share.

You can see the code in the attachment.

So I placed 2 BRs (breakpoints). The first BR is right before the normal sub of the timer. The second one is right after that. The ST(0) stores the timer value when game gets to BR 2.

The weird thing is, that if I place a BR on the marked instruction, the timer totally negates and after I run the game as normal, I get the plate instantly ( the breakpoints stay ).
placing a breakpoint on the fxch has the opposite effect - infinite timer.

So if you have any idea, I'd be happy to hear it. Or, if you know good FPU stack tuts, I'll be glad see them too.
Thanks beforehand.

Note: Thank you ParkourPenguin, beforehand Very Happy

.
Cheers!

Dark Byte · Posted: Sun May 16, 2021 8:13 am Post subject:

Are you using VEH debug?
If so, use the 32-bit CE
The 64-bit ce will set the fpu values to 0 when the target is 32 bit

ParkourPenguin · Posted: Sun May 16, 2021 11:21 am Post subject:

x87 is a collection of instructions that operate on floating point numbers. These instructions use the FPU stack to operate on data.
Stack:
https://computersciencewiki.org/index.php/Stack
https://en.wikipedia.org/wiki/Stack_%28abstract_data_type%29

st(i) refers to the value at index i from the top of the stack. This means st(0) is the value at the top of the stack, st(1) is the next value, etc.

sandsmaster · Newbie cheater Reputation: 1 Joined: 21 Jan 2021 Posts: 24

Yes, I'm using the VEH debugger.

I tried it with the 32-bit CE and it seems it works. And on top of that, that seems to solve my cheat
for instant plates, so that's great. 2 rabbits with one shot.

Thanks a lot Dark Byte.

And thank you, ParkourPenguin for the tuts and reference.
These are really good explanations for the topic. Not to kiss your butt, but u
really help a lot with these. If you have a Patreon, I'd be happy to give you back, in there.
Note: I'm a Patreon for cheat engine already tho.

Cheers and thanks again!