Cheat Engine

fred26 · Posted: Sun Jan 11, 2015 9:41 pm Post subject: Break on FPU Condition

Is there a way to break point if ST(0) meets some condition?

Thanks!

Dark Byte · Posted: Sun Jan 11, 2015 10:34 pm Post subject:

no, that is currently not possible.
try a code injection that checks the state and when it matches let it execute a nop where you can set the breakpoibt

fred26 · Posted: Mon Jan 12, 2015 6:22 am Post subject:

Thanks Dark Byte. Will try that.

How can check the FPU on every instruction? Like in one frame of certain game I want to check that condition on every instruction and if is true provoke a break?

zm0d · Posted: Mon Jan 12, 2015 7:06 am Post subject:

You can't unless you're going to use breakpoints and trace through the code. Use codeinjection on the interesting part of code, where you can access your FPU register you need and modify the fpu. There you go.

fred26 · Posted: Fri Jan 16, 2015 6:30 am Post subject:

Thanks. I will need to check on each instruction. In the code it is not clear when this happens, long and complex code - been back tracing for days and will need this option.
How can I check ST(0) value within a whole frame?
Thanks!

fred26 · Posted: Sun Jan 18, 2015 5:47 pm Post subject:

No takers?

fred26 · Posted: Sat Mar 14, 2015 11:40 am Post subject:

Can someone give me some help on how to create a code injection to check when ST0 has a specific value in a range of code?

Thanks

Zanzer · Posted: Sat Mar 14, 2015 11:48 am Post subject:

Maybe?

fred26 · Posted: Sat Mar 14, 2015 11:59 am Post subject:

Thanks.

Can I do this injection code in each FLD instruction for a whole range of code? Or this simply works only on one instruction?

Zanzer · Posted: Sat Mar 14, 2015 12:18 pm Post subject:

You would need to individually add this code at each instruction you're trying to debug.

fred26 · Posted: Sat Mar 14, 2015 12:37 pm Post subject:

Ok, thanks!