/*
* math coprocessor emulation fault
*/
static void
mathemu(Ureg *ureg, void*)
{
if(up->fpstate & FPillegal){
/* someone did floating point in a note handler */
postnote(up, 1, "sys: floating point in note handler", NDebug);
return;
}
switch(up->fpstate){
case FPinit:
fpinit();
up->fpstate = FPactive;
break;
case FPinactive:
/*
* Before restoring the state, check for any pending
* exceptions, there's no way to restore the state without
* generating an unmasked exception.
* More attention should probably be paid here to the
* exception masks and error summary.
*/
if((up->fpsave.status & ~up->fpsave.control) & 0x07F){
mathnote();
break;
}
fprestore(&up->fpsave);
up->fpstate = FPactive;
break;
case FPactive:
panic("math emu pid %ld %s pc 0x%lux",
up->pid, up->text, ureg->pc);
break;
}
}
static void
mathtrap(Ureg *, ulong)
{
int s;
if((up->fpstate & FPillegal) != 0){
postnote(up, 1, "sys: floating point in note handler", NDebug);
return;
}
switch(up->fpstate){
case FPinit:
s = splhi();
fpinit();
up->fpstate = FPactive;
splx(s);
break;
case FPinactive:
s = splhi();
fprestore(&up->fpsave);
up->fpstate = FPactive;
splx(s);
break;
case FPactive:
postnote(up, 1, "sys: floating point error", NDebug);
break;
}
}