It seems there has been a team that have been hard at work trying to find ways to emulate MacOS through linux. Well, there has now been an official release to the public called "MOL" (Mac On Linux) that emulates the kernal of a mac through Linux software. This program is designed for a PPC architecture (AKA, what Cell is).
The program has bugs, but considering its just a start to something much bigger, its not a problem. This shouldnt harm your ps3 in any way and is entirely legal. However, you should have a legal copy of the Mac Software that you will be using.
Click the link below to download the emulator: