Re: [Xenomai-help] trap exceptions in user

[Gabriele Moabiti <gabmoa@domain.hid>]

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I have upgraded the kernel to 2.6.24 + xenomai 2.4.5

The custom exception doesn't work as I expected.

static rthal_trap_handler_t old_trap_handler;
  In an the kernel driver I set:
old_trap_handler = rthal_trap_catch(&custom_trap_fault);
  the custom handler is:
static int custom_trap_fault(unsigned event, unsigned domid, void *data)
{
  if (is_my_application(...) && i_want_to_manage_exception(event)) {
    ManageCustomExceptions();
    return RTHAL_EVENT_STOP; /* 1=STOP */
 }
 return ((rthal_trap_handler_t) old_trap_handler)(event, domid, data);
}

The exception 7 is passed to the xenomai exception handler (TS flag).

I consider now ManageCustomExceptions a function that do nothing.

INT 3 or 1
Adeos does what I expected. It returns and nothing done.
The program continue happy to the next instruction.

INT 0 (divide error) or 16 (fpu exception)
The system hangs.
When I pass to xenomai It doesn't handle the exception and relax the thread an propagate
to linux (I think as expected to do).
[in the xnpod_trap_fault, xnpod_shadow_p is true then xnshadow_relax is performed so the 
 routine return 0 (RTHAL_EVENT_PROPAGATE)]

Is it possible to customize such exceptions? Am I missing something?

    Gabriele


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