Callee cleans the stack and first two arguments are passed in registers ecx and edx.
You could emulate this by choosing stdcall and setting the custom_registers on the arguments manually, but this is easier.
Floats are always returned in FPU register st0. Since the value in st0 doesn't matter in a pre-hook before the function was executed, don't try to save and restore the value of the FPU stack top for a pre-hook.
Only replace st0 after a post hook.
The post hook would have cleared the esp value from the return address map, but there seems to be a case where the post hook isn't called, but the function gets called with the same esp again. This is probably just masking a different error :(
If the compiler decided to pass an argument in a register on an internal function instead of pushing it on the stack to save time, allow us to specify the register the parameter is going to be in.
DHookAddParam received another parameter to set the register.
The esp pointer wasn't removed from the map after the function was called and the original return address was retrieved.
If the same function was called again with the same esp this would fail due to there already being an (old) return address associated with the esp.
The custom return value was lost when calling the original function.
Save and restore our own return value, if we're about to call the original function.
