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

David Schultz das at FreeBSD.ORG
Mon Jan 19 20:26:41 PST 2004

On Mon, Jan 19, 2004, Marcel Moolenaar wrote:
> marcel      2004/01/19 19:29:24 PST
>   FreeBSD src repository
>   Modified files:
>     sys/ia64/ia64        trap.c 
>   Log:
>   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?

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