how the qnx handles fpu unavailble exception (0x800) if hardware unit present ,
how qnx handles the fpu registers in context switch ,
why i receive Floating point exception (SIGFPE) from the qnx kernel .
I want to understand the ppc600 handlers for floating point emulator and hardware that reside in init_cpu600.c inside 
the kernel source.
I want to understand the fpu handling done in kernel_fpu.s inside the kernel source.