[ECOS] illegal instruction

Rick Davis rickdavisjr@comcast.net
Thu Jan 24 13:17:00 GMT 2008

I am working on a port to a FreeScale MPC85xx platform and am having a weird
issue. Periodically the processor throws a program exception and the esr
indicates an illegal instruction. The suspect PC is inside the interrupt VSR
saving registers. This code operates millions of times and then just decides
to blow up. It does not look like memory is getting over written by
The saved MSR indicates the processor was in supervisor mode and as far as I
know that never gets changed.

Any thoughts or suggestions on how to track this down?

Rick Davis

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