From: Norbert Bukuli <norbert.bukuli@mediso.hu>
To: xenomai@xenomai.org
Subject: [Xenomai] Floating point operations in kernel on powerpc
Date: Wed, 13 Feb 2013 14:28:04 +0100 [thread overview]
Message-ID: <511B94E4.2070708@mediso.hu> (raw)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Dear List Members,
First of all, this will be a newbie question, sorry for it.
Shortly, I have to port an old RTAI based kernelspace application to
Xenomai userpace. This application uses FPU so we compile it hard
float support. First step of the porting is switching the real-time
extension. I am done with this, however I have some compilation warnings:
WARNING: "_restfpr_22_x" [app.ko] undefined!
WARNING: "_restfpr_29_x" [app.ko] undefined!
WARNING: "_savefpr_22" [app.ko] undefined!
WARNING: "_savefpr_29" [app.ko] undefined!
I reproduced these warnings with the following example kernel module:
http://pastebin.com/AAehcivx
The corresponding Kbuild is:
obj-m := fpu_test.o
ccflags-y += -Iinclude/xenomai -Iinclude/xenomai/posix -mhard-float
As I see, the missing functions should be in the C runtime library,
however the kernel library (arch/powerpc/lib/crtsavres.S) contains
only save/restore macros for general purpose registers. On the other
hand, the Xenomai extensions provides kernelspace FPU facility and the
T_FPU flag was turned on rt_task_create().
So, my question is, how can I eliminate this problem?
The environment is the following:
Toolchain: ELDK-5.2.1, powerpc, hard float.
Kernel: linux-v3.2.21
Xenomai: v2.6.1
Any suggestion is highly appreciated. Thank you in advance!
- --
Best regards,
Norbert Bukuli
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
iQEcBAEBAgAGBQJRG5TkAAoJEJEs22zQJ00S86IIAIh0vYdLf5++r+0EZSkSGGD+
Mui9k9h4huRmUo31H9rWMJvU/DkJHAKrvoR/QBpQ1L6ty6xyeOoYhwzpEbW9e9TO
uy9nxBeB3ORg6RFV6NLKaP6iifgifYJKkT89mEjts8hbXNoRyxZHJUNJuQtDNh45
JB3EuGKbjB5ItISXJupeKE4CXGMRHKxcHBiM3l1Nxq+zwrO+/CyGWtO+ZjWzEN4/
fiWIBMm3g/p82+KxTqTQLmmOA0/0aAZcO02mw/v8/dPm8Ty+K9jB0cIsakPifehm
gDUVlg1r/uNEaj4KVc0exE6zdiWwhIq3brYAxfzbCeEpc4b+MeFDNyggYE8vi2M=
=FKk7
-----END PGP SIGNATURE-----
next reply other threads:[~2013-02-13 13:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-13 13:28 Norbert Bukuli [this message]
2013-02-13 13:45 ` [Xenomai] Floating point operations in kernel on powerpc Philippe Gerum
2013-02-13 15:49 ` Norbert Bukuli
2013-02-13 17:15 ` Philippe Gerum
2013-02-14 7:56 ` Norbert Bukuli
2013-02-14 15:28 ` Norbert Bukuli
2013-02-14 19:27 ` Gilles Chanteperdrix
2013-02-15 12:21 ` Philippe Gerum
2013-02-15 13:31 ` Norbert Bukuli
2013-02-15 14:51 ` Philippe Gerum
2013-02-15 15:24 ` Norbert Bukuli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=511B94E4.2070708@mediso.hu \
--to=norbert.bukuli@mediso.hu \
--cc=xenomai@xenomai.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.