Re: [Xenomai-help] floating point (int 16) exception

[Gabriele Moabiti <gabmoa@domain.hid>]

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>No, you do not read the sources correctly. Xenomai does handle FPU
>exception in primary mode. You know, I implemented part of this, so, you
>should not assume that I do not know what I am talking about.

I *REALLY* don't say you don't know what you say
(I ask you 'cause I think you know... :)

ring 3 xenomai task:
void xeno_task(void *cookie)
{
 static long loop_count=0;
  unsigned int cw=0x360;

  /* Unmask all but not precision, the int 7 will be raised */
  __asm__ __volatile__("fldcw %0;"::"m"(cw)); 
  for (;;loop_count++) {
    rt_task_wait_period(NULL);
        rt_printf("Loop number: %ld\n", loop_count);
    /* Let's raise an exception #16*/
    __asm__ __volatile__(
      "fldz;"
      "fld1;"
      "fdivrp %st(0),%st(1);"
      "fwait;"
    ); 
  }
}

xnarch_fault_fpu_p is related to int 7 that It manage the TS bit (fpu handling
of save restore only if the task use fpu) and it works, it doesn't switch to secondary
mode as you say.
If I pass to Xenomai the exception 16 of fdivrp the task end 'cause (i thought) the
switch to secondary mode. Sorry if i bug you but i really need a suggestion.


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