Cheat Engine

[Rissorr]

Can please some one explain me what are the operation/action of the following:

[Polynomial]

LEA means "load effective address". Think of it like a mov, except that it doesn't actually move anything.

For example, "mov eax, [ebx+ecx*4]" will multiply ecx by 4, add it to ebx, then read the memory at that address and put it in eax. Conversely, "lea eax, [ebx+ecx*4]" does the same calculation, but instead of reading the memory it just puts the address into eax instead. This is a useful arithmetic instruction because you can lump multiple calculations into one instruction. It's really useful if you want to compute a pointer at a dynamic offset.

INT 3 means "interrupt 3". It causes a trap signal (step exception) to be raised, which a debugger can then catch. It's used for software breakpoints.

CMP and TEST are both comparisons. CMP does a subtraction of the two operands, and sets flags based on the result. This is useful for doing numeric comparisons, e.g. less than, equal, greater than. TEST uses bitwise AND instead of a subtraction, which is useful for checking flags. For example, if you've got a flag of 0x1000 and you want to check if a particular register has that flag set, "test reg, 0x1000" will set the zero flag if the register does not have that flag set. From there you can use jnz or jz to do conditional jumps based on that.

[Rissorr]

wow!! thanks you
such a perfect answer
you explained everything perfectly!
it realy helpd!!!