From: Gabriele Moabiti <gabmoa@domain.hid>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: Jan Kiszka <jan.kiszka@domain.hid>, Xenomai help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] trap exceptions in user
Date: Fri, 24 Oct 2008 19:17:21 +0000 (GMT) [thread overview]
Message-ID: <66014.68232.qm@domain.hid> (raw)
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Gilles Chanteperdrix wrote:
> Gabriele Moabiti wrote:
>> (...)
>> I consider now ManageCustomExceptions a function that do nothing.
>> (...)
>> INT 0 (divide error) or 16 (fpu exception)
>> The system hangs.
>
> It will not work. It is because you have to handle the exception.
> Otherwise, when returning to user-space, your programs tries the faulty
> exception again, triggers the handler, which does nothing, and loops
> indefinitely...
>
so the int 1 and 3 are instead signed as traps with the old CS:EIP points past instruction causing exception...
Sorry for the question (I have always done it directly in asm reprogramming customizing the IDT), do I have to change the eip of the pt_regs structure passed to the function?
Thank you,
Gabriele
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next reply other threads:[~2008-10-24 19:17 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-24 19:17 Gabriele Moabiti [this message]
2008-10-26 23:49 ` [Xenomai-help] trap exceptions in user Gilles Chanteperdrix
-- strict thread matches above, loose matches on Subject: below --
2008-10-24 15:30 Gabriele Moabiti
2008-10-24 13:53 Gabriele Moabiti
2008-10-24 17:43 ` Gilles Chanteperdrix
2008-10-24 17:44 ` Gilles Chanteperdrix
2008-10-15 15:30 Gabriele Moabiti
2008-10-15 15:39 ` Jan Kiszka
2008-10-14 10:01 Gabriele Moabiti
2008-10-14 10:21 ` Jan Kiszka
2008-10-14 12:13 ` Gilles Chanteperdrix
2008-10-13 9:55 Gabriele Moabiti
2008-10-11 19:32 Gabriele Moabiti
2008-10-11 19:34 ` Gilles Chanteperdrix
2008-10-11 21:35 ` Philippe Gerum
2008-10-10 17:57 Gabriele Moabiti
2008-10-10 16:02 Gabriele Moabiti
2008-10-10 16:04 ` Gilles Chanteperdrix
2008-10-11 11:24 ` Gilles Chanteperdrix
2008-10-10 15:24 Gabriele Moabiti
2008-10-10 15:38 ` Gilles Chanteperdrix
2008-10-10 13:50 Gabriele Moabiti
2008-10-10 14:00 ` Gilles Chanteperdrix
2008-10-08 11:32 Gabriele Moabiti
2008-10-08 12:29 ` Gilles Chanteperdrix
2008-10-08 10:34 Gabriele Moabiti
2008-10-08 10:50 ` Gilles Chanteperdrix
[not found] <296620.67855.qm@domain.hid>
2008-10-08 10:09 ` Gilles Chanteperdrix
2008-10-03 12:30 Gabriele Moabiti
2008-10-03 14:58 ` Gilles Chanteperdrix
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