[linuxsh-dev] Floating point instruction question

[Pete L. <p_l...@ya...>]

Hi all,
I am compiling a kernel module that makes use of
floating point, which I understand is not a good
approach, but at the moment it's the best of a bad
situation.  
This module is running on a 2.4.13-pre2 kernel on an
ST40 (SH4) proc. GCC ver. 3.0.3.
I have added a fair amount of "soft float" math
routines to avoid the use of the floating point
hardware, and I am compiling the module and kernel,
using both the "-m4-nofpu" and "no-implicit-fp" flags.
 On assignment of a function returning a float type to
a float type local variable, an "flds" is generated,
and I end up in the kernel's do_fpu_state_restore()
which is an error since I'm in kernel mode.
Are there any other flags to make use of that will
avoid the generation of floating point commands?  I
thought that "-m4-nofpu" was the same as "-m3", (SH4
with no FPU?), so it seems I have misunderstood
something along the way.

Thanks for your time.


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