From patchwork Mon Aug 23 18:11:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Tomsich X-Patchwork-Id: 1519904 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=vrull-eu.20150623.gappssmtp.com header.i=@vrull-eu.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=ALLBJYwQ; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4GtgbV2DtNz9sCD for ; Tue, 24 Aug 2021 04:23:17 +1000 (AEST) Received: from localhost ([::1]:37932 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mIEbK-0007Kn-SB for incoming@patchwork.ozlabs.org; Mon, 23 Aug 2021 14:23:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38686) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIEQJ-0006Ub-RB for qemu-devel@nongnu.org; Mon, 23 Aug 2021 14:11:52 -0400 Received: from mail-lj1-x234.google.com ([2a00:1450:4864:20::234]:47048) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mIEQ8-0008J5-E1 for qemu-devel@nongnu.org; Mon, 23 Aug 2021 14:11:51 -0400 Received: by mail-lj1-x234.google.com with SMTP id w4so31526719ljh.13 for ; Mon, 23 Aug 2021 11:11:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vrull-eu.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=mVDf2DTleQlmUk2v3RS7SjiR8DsZ3TaK7txh2qX01oc=; b=ALLBJYwQaeFnQ3OVrI3XwD2sfo9oFj7bPicY6hbv/uXb1x6cHhyjnaQbRWhDQp82fk TLJFVbvk52NymdXdE/fT7XsJxd/rzeDpwaWUG0Y5+Cnu9Q5MCET6d3GENr0YBpaIBDuG sM88FpzuwneZ0M+95+gmwsfM9dnlsQv9oLREw4E+lePJd+bkAZlzMZ6azkoaNG9/qrZA PkRo+vo62gaWvzKQscfkXj0hSCEG5o0Kyyd+Li0w+EbVOuI32DVCanSVL25wQ5+UZQuo UHVGptURmF/kHJkOdCbA9Cjne+wfj04spnx1L27x1NKugGTZS45oIux4BxPeKoKXSKnr 1CgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=mVDf2DTleQlmUk2v3RS7SjiR8DsZ3TaK7txh2qX01oc=; b=EVlPTfk9962hHnADNjRh7ETZTVuq6SAIm4pBBQbgc1MhzoEJij9a60juKSFeJFq7Le /z57sEcU5hQZ21fMy5ZxcsWzb5Jpefb8qza+fQi34obySepdFskvWJ6SlscT1lQ25+lU fDbQwNBrz/s5PLa9E15qzoZzV1y4cug2u9CV3G0vBzPO8KTQ8evOQaQNt7K3qclDx+6X DjKnaBIZq10AKH8nwphyReTgDaBVDlNFzB2BzL4lc9Ie04PfGKXORDEDTPgOgIJaf0ah OiVtXYVE7FOYJ225JBe0f+/OPwk8HhVaObUwP2w6HPoU/ZfCBpFHOXmyxekG8a8FrqWQ iDlA== X-Gm-Message-State: AOAM533KcYsU8KNPgjktbi97C2igxnSnUDxlw7FNuvwvsq2Kef7MR/sZ GVR3miak9+LYCVgfcrjq+sBL4y2n/+p2YOY1 X-Google-Smtp-Source: ABdhPJwGcz1l16dA9T6aNKDJHkZjmFNW+0Tnv/S75FUZc4ezA2u2Oj29JJE/7r0BIAfkrL49MQJ09A== X-Received: by 2002:a2e:a555:: with SMTP id e21mr10883361ljn.44.1629742298788; Mon, 23 Aug 2021 11:11:38 -0700 (PDT) Received: from localhost.localdomain ([2a01:4f9:3a:1e26::2]) by smtp.gmail.com with ESMTPSA id w26sm1511739lfk.223.2021.08.23.11.11.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Aug 2021 11:11:38 -0700 (PDT) From: Philipp Tomsich To: qemu-devel@nongnu.org Subject: [PATCH v4 03/14] target/riscv: slli.uw is only a valid encoding if shamt first in 64 bits Date: Mon, 23 Aug 2021 20:11:21 +0200 Message-Id: <20210823181132.2205367-4-philipp.tomsich@vrull.eu> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210823181132.2205367-1-philipp.tomsich@vrull.eu> References: <20210823181132.2205367-1-philipp.tomsich@vrull.eu> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::234; envelope-from=philipp.tomsich@vrull.eu; helo=mail-lj1-x234.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-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: , Cc: Alistair Francis , Kito Cheng , Richard Henderson , Philipp Tomsich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" For RV64, the shamt field in slli.uw is 6 bits wide. While the encoding space currently reserves a wider shamt-field (for use is a future RV128 ISA), setting the additional bit to 1 will not map to slli.uw for RV64 and needs to be treated as an illegal instruction. Note that this encoding being reserved for a future RV128 does not imply that no other instructions for RV64-only could be added in this encoding space in the future. As the implementation is separate from the gen_shifti helpers, we keep it that way and add the check for the shamt-width here. Signed-off-by: Philipp Tomsich Reviewed-by: Richard Henderson --- (no changes since v3) Changes in v3: - Instead of defining a new decoding format, we treat slli.uw as if it had a 7bit-wide field for shamt (the 7th bit is reserved for RV128) and check for validity of the encoding in C code. target/riscv/insn_trans/trans_rvb.c.inc | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/riscv/insn_trans/trans_rvb.c.inc b/target/riscv/insn_trans/trans_rvb.c.inc index 3cdd70a2b9..dcc7b6893d 100644 --- a/target/riscv/insn_trans/trans_rvb.c.inc +++ b/target/riscv/insn_trans/trans_rvb.c.inc @@ -430,6 +430,15 @@ static bool trans_slli_uw(DisasContext *ctx, arg_slli_uw *a) REQUIRE_64BIT(ctx); REQUIRE_ZBA(ctx); + /* + * The shamt field is only 6 bits for RV64 (with the 7th bit + * remaining reserved for RV128). If the reserved bit is set + * on RV64, the encoding is illegal. + */ + if (a->shamt >= TARGET_LONG_BITS) { + return false; + } + TCGv source1 = tcg_temp_new(); gen_get_gpr(source1, a->rs1);