Flavio,
The original question is pretty old so I wonder if Catalin has already found sample code for interrupts on MPC5604B. If the topic is still open, though, I'd probably first look at the Qorivva cookbook reference code. There are both HW and SW vector mode examples included with the document, also known as AN2865. Here are the links to the PDF and the ZIP file with examples.
http://cache.freescale.com/files/32bit/doc/app_note/AN2865.pdf
http://www.freescale.com/webapp/sps/download/license.jsp?colCode=AN2865SW&location=null&Parent_n...=
If the format of this code is different than desired then there are examples included with CodeWarrior for MCU. For example, CW MCU v10.5 includes examples for MPC5604P where the interrupt controller functions in the same fashion as MPC5604B. Look under the following path within CodeWarrior:
<CodeWarrior>/MCU/CodeWarrior_Examples/Qorivva_Examples
MPC5604P_INTC-HW-VLE
MPC5604P_INTC-SW-VLE
There are also examples included with the StarterTRAK development kit, such as TRK-MPC5606B, which may be suitable. I haven't looked over those to confirm interrupts are used in each kit's example code.
Regards,
Michael Goudey