From nobody Tue Feb 10 12:42:37 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1627558024; cv=none; d=zohomail.com; s=zohoarc; b=bSOT+ec/xHf3TIxQR2Y/PqmumiHBqGS+DE9Cgin2vhUO6zO7NaWnL4UPHksSlU4wQOcbCiLraO28rbvV1mAU4vUcAorM1cTLCVuhF9Ih5EFaQGYzJMqytt4Iw5QHXCZ6H7nFG6g/tIE9JnkMsmSUX5lKs8QU6kgH46vYzSXVUoE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1627558024; h=Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=qmYdn/b+7uslGkmiRTc9E6zb61LbVOfXICGmdFgy+bQ=; b=ECMc1292llIQ7XVFquKI2wyrVfMMuCVJi/uQDbmld50yUDjHvK1a2elTuVzcH+4na7pqbw9M/R3HZkoL6tJI7eKu0+7RWz4j4ajQhC5hJpAWCng50DAD9htWSLPqTmhRr7SbcUJWrIIVHkz5afHeHMjQfPXzt4e6L5RaSQ0puIM= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1627558024859951.189785734132; Thu, 29 Jul 2021 04:27:04 -0700 (PDT) Received: from localhost ([::1]:53236 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m94Br-00076X-J0 for importer@patchew.org; Thu, 29 Jul 2021 07:27:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39888) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m940k-0000R8-HU for qemu-devel@nongnu.org; Thu, 29 Jul 2021 07:15:37 -0400 Received: from mail-wr1-x435.google.com ([2a00:1450:4864:20::435]:38588) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m940a-00012Z-6I for qemu-devel@nongnu.org; Thu, 29 Jul 2021 07:15:34 -0400 Received: by mail-wr1-x435.google.com with SMTP id l18so6461616wrv.5 for ; Thu, 29 Jul 2021 04:15:23 -0700 (PDT) Received: from orth.archaic.org.uk (orth.archaic.org.uk. [81.2.115.148]) by smtp.gmail.com with ESMTPSA id j140sm3037829wmj.37.2021.07.29.04.15.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jul 2021 04:15:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=qmYdn/b+7uslGkmiRTc9E6zb61LbVOfXICGmdFgy+bQ=; b=KiwvbyvnDCKLQ8U1e4tmBErUZ9PzM20Q0BvEHUH28UfyxKXBmxOdRcoC5PTRkoQwNh iDK2GRKFeIh7mlXu/+BiaWXTXUNxofZWVqbctvz7iGrx1nEAlOZcc8crEWKn8tj6pmEe LpfmJ6FGFv8VW6WlXJUSMAQHJJcyUMO8x4TSBq/keE05KLOfpYKoF04UFrAUQVu3xrb6 V1WvVVtdSikmAIicqHSs8XqrpvKqtISo1y77SvmvSJp2oyIiBE5rlz4WN0Ahxf/IELt0 JJvJuWEr8ORdQqH8EbosJyYpBzzOGQfWWQfOVz1P7lxUsTvDukphGE2H2R76eh/xr7mv Dh7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=qmYdn/b+7uslGkmiRTc9E6zb61LbVOfXICGmdFgy+bQ=; b=esFKXNEVKYg+SDCHNrlgfhHFZJAao5BH1s2n4BOTT69RfmRH/+i4djbxtf7XAl2F95 IFAfbeaxqvsDymEKAV+wA/WCQr2B2wQ1ZhXu20ECf43unDIyTMxUiC/7O5POXPDngF7A Ipa/VLPSLroDozmTC94zjfeDmoBKun4UEbNXJ3stUNvHP8L1zkmdYzNcrj7ZdjXIy1p5 5cYiBdueAYCF5xdAY2WvsnoYbDLdOGqBXw/kHkh8N0WOeBiTzJ/izzBylUC64Ufm0Lsv x/thvZI2U5zkMpWjJozvquYvbLr/HBrVXS5splgCTfEwjfso/JvZB7NrBi0Y8mnPaqZU 92xA== X-Gm-Message-State: AOAM530k7Hr2l6SxVQxiSWufzb2dAqI4xG93SMT8vL+TLtxAlisBh/C9 jDUcJhgDeGm9eHxVzMIAXBQ1cONEYhO7FQ== X-Google-Smtp-Source: ABdhPJyEIuxAFGBcoxeu396kyoyXES3d9WB3AanQQF6ZDJxvLiq53pd/lhjf4XIHMoYe23mWnH7cVQ== X-Received: by 2002:a5d:54c7:: with SMTP id x7mr4291482wrv.77.1627557322794; Thu, 29 Jul 2021 04:15:22 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH for-6.2 10/53] target/arm: Fix VPT advance when ECI is non-zero Date: Thu, 29 Jul 2021 12:14:29 +0100 Message-Id: <20210729111512.16541-11-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210729111512.16541-1-peter.maydell@linaro.org> References: <20210729111512.16541-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::435; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x435.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1627558027181100001 Content-Type: text/plain; charset="utf-8" We were not paying attention to the ECI state when advancing the VPT state. Architecturally, VPT state advance happens for every beat (see the pseudocode VPTAdvance()), so on every beat the 4 bits of VPR.P0 corresponding to the current beat are inverted if required, and at the end of beats 1 and 3 the VPR MASK fields are updated. This means that if the ECI state says we should not be executing all 4 beats then we need to skip some of the updating of the VPR that we currently do in mve_advance_vpt(). Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target/arm/mve_helper.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c index ffff280726d..bc89ce94d5a 100644 --- a/target/arm/mve_helper.c +++ b/target/arm/mve_helper.c @@ -110,6 +110,8 @@ static void mve_advance_vpt(CPUARMState *env) /* Advance the VPT and ECI state if necessary */ uint32_t vpr =3D env->v7m.vpr; unsigned mask01, mask23; + uint16_t inv_mask; + uint16_t eci_mask =3D mve_eci_mask(env); =20 if ((env->condexec_bits & 0xf) =3D=3D 0) { env->condexec_bits =3D (env->condexec_bits =3D=3D (ECI_A0A1A2B0 <<= 4)) ? @@ -121,17 +123,25 @@ static void mve_advance_vpt(CPUARMState *env) return; } =20 + /* Invert P0 bits if needed, but only for beats we actually executed */ mask01 =3D FIELD_EX32(vpr, V7M_VPR, MASK01); mask23 =3D FIELD_EX32(vpr, V7M_VPR, MASK23); - if (mask01 > 8) { - /* high bit set, but not 0b1000: invert the relevant half of P0 */ - vpr ^=3D 0xff; + /* Start by assuming we invert all bits corresponding to executed beat= s */ + inv_mask =3D eci_mask; + if (mask01 <=3D 8) { + /* MASK01 says don't invert low half of P0 */ + inv_mask &=3D ~0xff; } - if (mask23 > 8) { - /* high bit set, but not 0b1000: invert the relevant half of P0 */ - vpr ^=3D 0xff00; + if (mask23 <=3D 8) { + /* MASK23 says don't invert high half of P0 */ + inv_mask &=3D ~0xff00; } - vpr =3D FIELD_DP32(vpr, V7M_VPR, MASK01, mask01 << 1); + vpr ^=3D inv_mask; + /* Only update MASK01 if beat 1 executed */ + if (eci_mask & 0xf0) { + vpr =3D FIELD_DP32(vpr, V7M_VPR, MASK01, mask01 << 1); + } + /* Beat 3 always executes, so update MASK23 */ vpr =3D FIELD_DP32(vpr, V7M_VPR, MASK23, mask23 << 1); env->v7m.vpr =3D vpr; } --=20 2.20.1