SW Crash Analysis - Instruction Access Exception - VxWorks

Hello,

I have the following output on the TShell

---------------------------------------------------------------------
instruction access
Exception next instruction address: 0xcc33cc30
Machine Status Register: 0x4000b030
Condition Register: 0x2000c084
Task: 0x5797fa0 "FirmwareProgramming"
---------------------------------------------------------------------

I have spawned a task named "FirmwareProgramming". It crashes for
unknown reason only sometimes. Is the above information useful for
error analysis ? How can I track down to the line of code where the
problem occurred ?

Or does it just say "access to 0xcc33cc30 no allowed" ?

Regards
Enie

Hi:

Type tt in the shell and you'll get a task trace and the addres of the
crash. Still could be a problem. Obviously, somewhere in
FirmwareProgramming called something that jumped to a bad address. The
trace might give you a hint where it was.

If you needed help matching up with source, you'll have to either step
or use the Tornado "show mixed", or use objdumpppc on the link output
to see where stuff is (after seeing where FirmwareProgramming was
loaded in memory.

Good luck,
lc
Enie45 wrote:
> Hello,
>
> I have the following output on the TShell
>
> ---------------------------------------------------------------------
> instruction access
> Exception next instruction address: 0xcc33cc30
> Machine Status Register: 0x4000b030
> Condition Register: 0x2000c084
> Task: 0x5797fa0 "FirmwareProgramming"
> ---------------------------------------------------------------------
>
> I have spawned a task named "FirmwareProgramming". It crashes for
> unknown reason only sometimes. Is the above information useful for
> error analysis ? How can I track down to the line of code where the
> problem occurred ?
>
> Or does it just say "access to 0xcc33cc30 no allowed" ?
>
> Regards
> Enie

Hi,

I have got similar "Instruction Access" exception. But unfortunately this happened on remote system where I could not get task traces (tt).

instruction access
Exception next instruction address: 0x006a9e5c
Machine Status Register: 0x4000b032
Condition Register: 0x20000082
Task: 0xf2ab5f0 "bcmLINK.0

The assembly code at this memory shows an "or" operation.

0x6a9e5c 7f64db78 or r4,r27,r27

Can any one let me know the reason for this exception and under which conditions this exception may raise?