> just to get it right - As i thought the FPU emulator is not really
> optional - It is even required for fpu-enabled devices which means
> we should clean the code in that way that if the user decides to
> compile in the fpu emulator into the kernel we do an autodetection
> upfront and change some of the entry/exit/lazy_fpu stuff.
> If the user decides not to compile in the FPU Emulator he is on his
> own and we ignore the whole FPU stuff and simply send SIGILL/SIGFPE
> to the processes causing all fpu binarys to fail on non-fpu enabled
Not quite. Unless we create a variant of glibc that neither
initializes the FP control register on program startup, nor
saves/restores the FP registers in setjmp/longjmp, the
model of "simply sending SIGILL/SIGFPE" will result
in *all* processes being terminated with extreme prejudice,
starting with init!