On 02/13/2013 02:28 PM, Norbert Bukuli wrote:
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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?
Xenomai's context switching code does the necessary housekeeping to
save/restore fprs. You don't have to call these routines.
--
Philippe.
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