Re: [Xenomai-help] trap exceptions in user

[Gabriele Moabiti <gabmoa@domain.hid>]

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> Xenomai uses rthal_trap_catch, so, you can use Xenomai code as an example.

Named
KD: kernel driver (ring 0).
UD: user space task (ring 3).

- KD reserve 16 MB  of memory (note: virtual and physical contiguous)

- I use rthal_trap_catch to customize exceptions (redirected to "custom_except" function)
  The "custom_except" function print the number of exception and recall the xenomai standard one.

- KD has an rtdm interface to map the 16 MB memory on user space with rtdm_iomap_to_user.

- UD starts and It maps with the rtdm (rtdm_iomap_to_user)

- UD copy a binary asm x86 test fpu (some instructions to generate exceptions for tests) in the 16 MB memory mapped

- UD start the real time task

Now here is a the problem.
If I invoke an exception (int 3, floating point exception and so on) outside the 16 MB mapped memory "custom_except" is called ok.
If the same code is invoked into the 16 MB mapped memory the program crash (and this is ok) reporting the description of the exception in the terminal (also this is ok) but "custom_except" is not called!

Is there something wrong using the mapped memory in this mode?

NOTE:
I am using xenomai 2.4.0rc1 with kernel 2.6.23


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