Question

I am getting an exception “Invalid Program Counter Address” in Vxworks + PPC 603.

Application is linking to multiple ‘C’ libraries. Am not able to place, what could cause this problem?

Is there a possibility that incorrect compilation options could be causing this?

Any directions or pointers will be helpful.

Thanks

UPDATE:

I am having a structure whose members are function pointers. The structure itself is static and it’s address is passed around and through the structure different functions are being invoked.

During one of the test rounds, I found that in the function pointer, the function address value is reduced by 1. If the function address is 0x009a3730, the PC is having 0x00913729.

Also, if I change the compiler options, the place of crash or the number of runs after which the crash happens changes.

Answer 1

@All, Thanks for your suggestions.

It turned out that the location containing the address was incorrectly getting pointed to a reference member of another structure and that reference member was getting decremented by one in each call to free that structure.

The memory for that structure should have been allocated by a call to one of our functions. But, instead it was left to refer to some garbade memory without any initalization or memory allocation and it ended up referring to this static memory where the global structure is stored. This led to the static structure getting corrupted and which inturn led to the crash.

A thorough line-by-line analysis of our logs helped in putting all pieces together.