From nobody Mon Feb 9 17:21:59 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1495747040620405.2001016526357; Thu, 25 May 2017 14:17:20 -0700 (PDT) Received: from localhost ([::1]:33738 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dE08F-0000r2-0P for importer@patchew.org; Thu, 25 May 2017 17:17:19 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55217) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dDzwc-0005e8-AG for qemu-devel@nongnu.org; Thu, 25 May 2017 17:05:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dDzwa-0001LT-9K for qemu-devel@nongnu.org; Thu, 25 May 2017 17:05:18 -0400 Received: from hall.aurel32.net ([2001:bc8:30d7:100::1]:37420) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dDzwa-0001KH-0v for qemu-devel@nongnu.org; Thu, 25 May 2017 17:05:16 -0400 Received: from [2001:bc8:30d7:121:cc44:2c6c:4d9c:42c0] (helo=ohm.rr44.fr) by hall.aurel32.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1dDzwY-0008RJ-4r; Thu, 25 May 2017 23:05:14 +0200 Received: from aurel32 by ohm.rr44.fr with local (Exim 4.89) (envelope-from ) id 1dDzwW-0001KE-FZ; Thu, 25 May 2017 23:05:12 +0200 From: Aurelien Jarno To: qemu-devel@nongnu.org Date: Thu, 25 May 2017 23:04:57 +0200 Message-Id: <20170525210508.4910-16-aurelien@aurel32.net> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170525210508.4910-1-aurelien@aurel32.net> References: <20170525210508.4910-1-aurelien@aurel32.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2001:bc8:30d7:100::1 Subject: [Qemu-devel] [PATCH 15/26] target/s390x: fix COMPARE LOGICAL LONG EXTENDED X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexander Graf , Aurelien Jarno , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" There are multiple issues with the COMPARE LOGICAL LONG EXTENDED instruction: - The test between the two operands is inverted, leading to an inversion of the cc values 1 and 2. - The address and length of an operand continue to be decreased after reaching the end of this operand. These values are then wrong write back to the registers. - We should limit the amount of bytes to process, so that interrupts can be served correctly. Signed-off-by: Aurelien Jarno Reviewed-by: Richard Henderson --- target/s390x/mem_helper.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c index 1dc71fe5f0..bd3bce3623 100644 --- a/target/s390x/mem_helper.c +++ b/target/s390x/mem_helper.c @@ -716,28 +716,48 @@ uint32_t HELPER(clcle)(CPUS390XState *env, uint32_t r= 1, uint64_t a2, uint64_t srclen =3D get_length(env, r3 + 1); uint64_t src =3D get_address(env, r3); uint8_t pad =3D a2 & 0xff; + uint64_t len =3D MAX(srclen, destlen); uint32_t cc =3D 0; =20 if (!(destlen || srclen)) { return cc; } =20 - if (srclen > destlen) { - srclen =3D destlen; + /* Lest we fail to service interrupts in a timely manner, limit the + amount of work we're willing to do. For now, let's cap at 8k. */ + if (len > 0x2000) { + len =3D 0x2000; + cc =3D 3; } =20 - for (; destlen || srclen; src++, dest++, destlen--, srclen--) { - uint8_t v1 =3D srclen ? cpu_ldub_data_ra(env, src, ra) : pad; - uint8_t v2 =3D destlen ? cpu_ldub_data_ra(env, dest, ra) : pad; + for (; len; len--) { + uint8_t v1 =3D pad; + uint8_t v2 =3D pad; + + if (srclen) { + v1 =3D cpu_ldub_data_ra(env, src, ra); + } + if (destlen) { + v2 =3D cpu_ldub_data_ra(env, dest, ra); + } + if (v1 !=3D v2) { - cc =3D (v1 < v2) ? 1 : 2; + cc =3D (v1 > v2) ? 1 : 2; break; } + + if (srclen) { + src++; + srclen--; + } + if (destlen) { + dest++; + destlen--; + } } =20 set_length(env, r1 + 1, destlen); - /* can't use srclen here, we trunc'ed it */ - set_length(env, r3 + 1, env->regs[r3 + 1] - src - env->regs[r3]); + set_length(env, r3 + 1, srclen); set_address(env, r1, dest); set_address(env, r3, src); =20 --=20 2.11.0