[ECOS] Floating Point Register saves

[David Brennan]

According to the documentation in the i386 hal cdl documentation, it 
states that by default eCos will "save and restore FPU state on every 
thread switch, interrupt and exception." It states this in the option 
for turning off lazy FPU switching. Our application uses floating point 
registers in the DSR context. With Lazy FPU on, we get an SIGFPE. (Which 
I guess is not surprising). So we have turned off lazy FPU switching. 
With lazy FPU off, is it safe to use floating points in DSR (or ISR) 
context? (We got burned by this earlier under VxWorks.)

If not, is there a preferred way of saving, and restoring the floating 
point registers?

Thanks
David Brennan


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