From patchwork Fri Sep 6 07:57:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 11134671 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ABCE51398 for ; Fri, 6 Sep 2019 08:09:29 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 89848206A1 for ; Fri, 6 Sep 2019 08:09:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 89848206A1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:53284 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i69JA-0008Cq-CN for patchwork-qemu-devel@patchwork.kernel.org; Fri, 06 Sep 2019 04:09:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42530) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i6993-0004NK-Km for qemu-devel@nongnu.org; Fri, 06 Sep 2019 03:59:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i6991-0003he-6w for qemu-devel@nongnu.org; Fri, 06 Sep 2019 03:59:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33408) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i698x-0003dl-HS; Fri, 06 Sep 2019 03:58:58 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5472C307CB3F; Fri, 6 Sep 2019 07:58:52 +0000 (UTC) Received: from t460s.redhat.com (ovpn-117-162.ams2.redhat.com [10.36.117.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8A9801001956; Fri, 6 Sep 2019 07:58:48 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Date: Fri, 6 Sep 2019 09:57:45 +0200 Message-Id: <20190906075750.14791-24-david@redhat.com> In-Reply-To: <20190906075750.14791-1-david@redhat.com> References: <20190906075750.14791-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Fri, 06 Sep 2019 07:58:52 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 23/28] s390x/tcg: MVCIN: Fault-safe handling X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Florian Weimer , Thomas Huth , David Hildenbrand , Cornelia Huck , Stefano Brivio , qemu-s390x@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" We can process a maximum of 256 bytes, crossing two pages. Calculate the accessed range upfront - src is accessed right-to-left. Signed-off-by: David Hildenbrand Reviewed-by: Richard Henderson --- target/s390x/mem_helper.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c index 49b4879859..ba8a657e18 100644 --- a/target/s390x/mem_helper.c +++ b/target/s390x/mem_helper.c @@ -473,12 +473,20 @@ void HELPER(mvc)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) /* move inverse */ void HELPER(mvcin)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) { + S390Access srca, desta; uintptr_t ra = GETPC(); int i; - for (i = 0; i <= l; i++) { - uint8_t v = cpu_ldub_data_ra(env, src - i, ra); - cpu_stb_data_ra(env, dest + i, v, ra); + /* MVCIN always copies one more byte than specified - maximum is 256 */ + l++; + + src = wrap_address(env, src - l + 1); + srca = access_prepare(env, src, l, MMU_DATA_LOAD, ra); + desta = access_prepare(env, dest, l, MMU_DATA_STORE, ra); + for (i = 0; i < l; i++) { + const uint8_t x = access_get_byte(env, &srca, l - i - 1, ra); + + access_set_byte(env, &desta, i, x, ra); } }