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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: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190218122710.23639-8-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
master
David Hildenbrand 2019-02-18 13:27:02 +01:00 committed by Cornelia Huck
parent f66a0ecf23
commit 8772bbe4e7
1 changed files with 13 additions and 0 deletions
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13
target/s390x/fpu_helper.c
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@ -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());
}
}