From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:37953) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gvi1M-0003jR-IP for qemu-devel@nongnu.org; Mon, 18 Feb 2019 07:27:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gvi1L-0004QC-K3 for qemu-devel@nongnu.org; Mon, 18 Feb 2019 07:27:40 -0500 From: David Hildenbrand Date: Mon, 18 Feb 2019 13:27:03 +0100 Message-Id: <20190218122710.23639-9-david@redhat.com> In-Reply-To: <20190218122710.23639-1-david@redhat.com> References: <20190218122710.23639-1-david@redhat.com> Subject: [Qemu-devel] [PATCH v3 08/15] s390x/tcg: Handle SET FPC AND LOAD FPC 3-bit BFP rounding modes List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, Thomas Huth , Halil Pasic , Christian Borntraeger , Janosch Frank , Cornelia Huck , Richard Henderson , David Hildenbrand We already forward the 3 bits correctly in the translation functions. We also have to handle them properly and check for specification exceptions. Setting an invalid rounding mode (BFP only, all DFP rounding modes) results in a specification exception. Setting unassigned bits in the fpc, results in a specification exception. This fixes LOAD FPC (AND SIGNAL), SET FPC (AND SIGNAL). Also for, SET BFP ROUNDING MODE, 3-bit rounding mode is now explicitly checked. Note: TCG_CALL_NO_WG is required for sfpc handler, as we now inject exceptions. We won't be modeling abscence of the "floating-point extension facility" for now, not necessary as most take the facility for granted without checking. z14 PoP, 9-23, "LOAD FPC" When the floating-point extension facility is installed, bits 29-31 of the second operand must specify a valid BFP rounding mode and bits 6-7, 14-15, 24, and 28 must be zero; otherwise, a specification exception is recognized. Signed-off-by: David Hildenbrand --- target/s390x/fpu_helper.c | 22 ++++++++++++++++++---- target/s390x/helper.h | 2 +- 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/target/s390x/fpu_helper.c b/target/s390x/fpu_helper.c index 7508c0748e..4dc70ec60f 100644 --- a/target/s390x/fpu_helper.c +++ b/target/s390x/fpu_helper.c @@ -753,21 +753,30 @@ uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al) return RET128(ret); } -static const int fpc_to_rnd[4] = { +static const int fpc_to_rnd[8] = { float_round_nearest_even, float_round_to_zero, float_round_up, - float_round_down + float_round_down, + -1, + -1, + -1, + float_round_to_odd, }; /* set fpc */ void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc) { + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC()); + } + /* Install everything in the main FPC. */ env->fpc = fpc; /* Install the rounding mode in the shadow fpu_status. */ - set_float_rounding_mode(fpc_to_rnd[fpc & 3], &env->fpu_status); + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); } /* set fpc and signal */ @@ -776,12 +785,17 @@ void HELPER(sfas)(CPUS390XState *env, uint64_t fpc) uint32_t signalling = env->fpc; uint32_t s390_exc; + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC()); + } + /* * FPC is set to the FPC operand with a bitwise OR of the signalling * flags. */ env->fpc = fpc | (signalling & 0x00ff0000); - set_float_rounding_mode(fpc_to_rnd[fpc & 3], &env->fpu_status); + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); /* * If any signaling flag is enabled in the new FPC mask, a diff --git a/target/s390x/helper.h b/target/s390x/helper.h index 6260b50496..a99b067c9c 100644 --- a/target/s390x/helper.h +++ b/target/s390x/helper.h @@ -104,7 +104,7 @@ DEF_HELPER_4(trtr, i32, env, i32, i64, i64) DEF_HELPER_5(trXX, i32, env, i32, i32, i32, i32) DEF_HELPER_4(cksm, i64, env, i64, i64, i64) DEF_HELPER_FLAGS_5(calc_cc, TCG_CALL_NO_RWG_SE, i32, env, i32, i64, i64, i64) -DEF_HELPER_FLAGS_2(sfpc, TCG_CALL_NO_RWG, void, env, i64) +DEF_HELPER_FLAGS_2(sfpc, TCG_CALL_NO_WG, void, env, i64) DEF_HELPER_FLAGS_2(sfas, TCG_CALL_NO_WG, void, env, i64) DEF_HELPER_FLAGS_1(popcnt, TCG_CALL_NO_RWG_SE, i64, i64) DEF_HELPER_2(stfle, i32, env, i64) -- 2.17.2