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OVERWRITE EXCEPTION HANDLER

Hello,

I use the NXP LPC 2368 and want to write a function to save the exceptions Data Abort Error, Undefined Instruction Error and Pre-fetch Abort Error in a seriel EEPROM and after reset the CPU.
How can I overwrite the dummy exception handler Undef_Handler, PAbt_Handler and DAbt_Handler with C code?
I found the technical support:
http://www.keil.com/support/docs/3027.htm
If I write the irq-functions there is no warning and no error so far so good. But if I test the irq the PC stuck always in the dummy function in startup and not in my own function!
Somebody have a idea?