I need to trap and manage  exceptions (floating point for example).
I want to execute at user domain (x86-ring 3) something like that

real_time_task function:
{
  <set exception handlers> (for example fpu_handler)

  <real time code (asm x86)>  (this code need  custom management of exceptions)

  <release exception handlers>
}

fpu_handler function
{
  ...
}

I need to customize some exception (fpu is the most important) inside real time.
How can I do that?
Is it possible in  the rt user domain? And what about that in the rt-kernel domain?

Thank you