From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Rodrigo Rosenfeld Rosas <lbocseg@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] FPU not available in user-space programs
Date: Thu, 6 Jul 2006 13:33:26 +0200 [thread overview]
Message-ID: <17580.62726.293737.991643@domain.hid> (raw)
In-Reply-To: <44AC8482.6000902@domain.hid>
Rodrigo Rosenfeld Rosas wrote:
> Hi,
>
> I was looking at /proc/xenomai/faults and noticed that the only errors
> were on TRAP 7 (FPU not available).
>
> Each time I run the user-space program using the native skin, I
> increment the fault by one. I don't understand why this happens. From
> documentation, FPU should be enabled automatically for user-space programs.
>
> Any ideas why I'm getting this error and what does it mean? Should I do
> some float-point operation before creating my real-time tasks?
This fault is not an error, it happens when a task use the FPU for the
first time in primary mode. When in secondary mode, such an FPU fault
happens every time the FPU is used after a context switch, you simply do
not know about it because it is not accounted for.
--
Gilles Chanteperdrix.
next prev parent reply other threads:[~2006-07-06 11:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-06 3:33 [Xenomai-help] FPU not available in user-space programs Rodrigo Rosenfeld Rosas
2006-07-06 7:13 ` Jan Kiszka
2006-07-06 11:33 ` Gilles Chanteperdrix [this message]
2006-07-06 16:45 ` Rodrigo Rosenfeld Rosas
2006-07-07 0:12 ` Gilles Chanteperdrix
2006-07-10 2:16 ` [Xenomai-help] FPU not available in user-space programs [Doxygen] Rodrigo Rosenfeld Rosas
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