cvs commit: src/sys/ia64/ia64 trap.c

[Marcel Moolenaar]

On Mon, Jan 19, 2004 at 08:26:10PM -0800, David Schultz wrote:
> On Mon, Jan 19, 2004, Marcel Moolenaar wrote:
> >   Fix handling of FP traps:
> >   o  For traps, the cr.iip register points to the next instruction to
> >      execute on interrupt return (modulo slot). Since we need to get
> >      the bundle of the instruction that caused the FP fault/trap, make
> >      sure we fetch the previous bundle if the next instruction is in
> >      fact the first in a bundle.
> >   o  When we call the FPSWA handler, we need to tell it whether it's
> >      a trap or a fault (first argument). This was hardcoded to mean a
> >      fault.
> >   
> >   Also, for FP faults, when a fault is converted to a trap, adjust the
> >   cr.iip and cr.ipsr registers to point to the next instruction. This
> >   makes sure that the SIGFPE handler gets a consistent state.
> 
> Does this fix the spurious SIGFPEs that were being delivered on
> denormal traps?

Yes, AFAICT. It definitely fixes the awk(1) problem I described.

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel at xcllnt.net