Commit 8772bbe4 authored by David Hildenbrand's avatar David Hildenbrand Committed by Cornelia Huck
Browse files

s390x/tcg: Fix simulated-IEEE exceptions 



The trap is triggered based on priority of the enabled signaling flags.
Only overflow and underflow allow a concurrent inexact exception.

z14 PoP, 9-33, Figure 9-21

Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
Message-Id: <20190218122710.23639-8-david@redhat.com>
Signed-off-by: default avatarCornelia Huck <cohuck@redhat.com>
parent f66a0ecf

target/s390x/fpu_helper.c

+13 −0
Original line number Diff line number Diff line
@@ -789,6 +789,19 @@ void HELPER(sfas)(CPUS390XState *env, uint64_t fpc) 
     */

    s390_exc = (signalling >> 16) & (fpc >> 24);

    if (s390_exc) {

        if (s390_exc & S390_IEEE_MASK_INVALID) {

            s390_exc = S390_IEEE_MASK_INVALID;

        } else if (s390_exc & S390_IEEE_MASK_DIVBYZERO) {

            s390_exc = S390_IEEE_MASK_DIVBYZERO;

        } else if (s390_exc & S390_IEEE_MASK_OVERFLOW) {

            s390_exc &= (S390_IEEE_MASK_OVERFLOW | S390_IEEE_MASK_INEXACT);

        } else if (s390_exc & S390_IEEE_MASK_UNDERFLOW) {

            s390_exc &= (S390_IEEE_MASK_UNDERFLOW | S390_IEEE_MASK_INEXACT);

        } else if (s390_exc & S390_IEEE_MASK_INEXACT) {

            s390_exc = S390_IEEE_MASK_INEXACT;

        } else if (s390_exc & S390_IEEE_MASK_QUANTUM) {

            s390_exc = S390_IEEE_MASK_QUANTUM;

        }

        tcg_s390_data_exception(env, s390_exc | 3, GETPC());

    }

}