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([2a01:4f9:3a:1e26::2]) by smtp.gmail.com with ESMTPSA id f8-20020a2eb5a8000000b0025e72aae6bdsm356151ljn.28.2022.08.12.06.13.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Aug 2022 06:13:08 -0700 (PDT) From: Philipp Tomsich To: qemu-devel@nongnu.org Cc: Philipp Tomsich , Alistair Francis , Bin Meng , Palmer Dabbelt , qemu-riscv@nongnu.org Subject: [PATCH 1/2] target/riscv: fence.i: update decode pattern Date: Fri, 12 Aug 2022 15:13:03 +0200 Message-Id: <20220812131304.1674484-1-philipp.tomsich@vrull.eu> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::130; envelope-from=philipp.tomsich@vrull.eu; helo=mail-lf1-x130.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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The RISC-V specification specifies imm12, rs1 and rd to be all-zeros, so we can't ignore these bits when decoding into fence.i. Update the decode pattern to reflect the specification. Signed-off-by: Philipp Tomsich --- target/riscv/insn32.decode | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index 014127d066..089128c3dc 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -151,7 +151,7 @@ sra 0100000 ..... ..... 101 ..... 0110011 @r or 0000000 ..... ..... 110 ..... 0110011 @r and 0000000 ..... ..... 111 ..... 0110011 @r fence ---- pred:4 succ:4 ----- 000 ----- 0001111 -fence_i ---- ---- ---- ----- 001 ----- 0001111 +fence_i 000000000000 00000 001 00000 0001111 csrrw ............ ..... 001 ..... 1110011 @csr csrrs ............ ..... 010 ..... 1110011 @csr csrrc ............ ..... 011 ..... 1110011 @csr From patchwork Fri Aug 12 13:13:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Tomsich X-Patchwork-Id: 12942246 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 298E7C00140 for ; Fri, 12 Aug 2022 13:16:08 +0000 (UTC) Received: from localhost ([::1]:36108 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oMUWF-00055s-6l for qemu-devel@archiver.kernel.org; Fri, 12 Aug 2022 09:16:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53342) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oMUTU-0002ov-IV for qemu-devel@nongnu.org; Fri, 12 Aug 2022 09:13:16 -0400 Received: from mail-lj1-x22b.google.com ([2a00:1450:4864:20::22b]:35757) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oMUTQ-0001gL-39 for qemu-devel@nongnu.org; Fri, 12 Aug 2022 09:13:14 -0400 Received: by mail-lj1-x22b.google.com with SMTP id l21so925990ljj.2 for ; Fri, 12 Aug 2022 06:13:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vrull.eu; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=ixI1TlD3gg+it4H/Ncl3Spin19APaasX6jZ6LF0hhFg=; b=fxJ1nkf6BiZg51l1xsdgQNR3SBur+cY2xlpc7pLmchN5XOR2U1Pn1rATR0eUydsL8M iuAHiYngAYnSMyjxCrqCIdC/rHjNZMQQ7+tOzGeodusvJ34iKAcz1yk1r+XhYxYc56No 13XTmecrMOUx5dxmPQr+PGs6LdBh4nw2KgHNuDpkVDXyCrR3wYpDWTj4uGCS3zm04pVh VcoyxGXCLzdzaERE+roKi7VdnruPh5BGz4ZYmRty9KOubxQ8j/sEZmliVSB5puTNPbHM XWel5mdOoxRhKH/4pY0uyXd3VQCiIqVrOyCJOcCvltYsAQZzInWvJG9aoHTjVvDxgfhl iPig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=ixI1TlD3gg+it4H/Ncl3Spin19APaasX6jZ6LF0hhFg=; b=uP6XuDYEu57U7ngQjFVIV7qULaHsILYi/xjtKfD3Y2GHiB1rka8u/qeWfwk8E4mSIs lcKqXcZyM4La7P+vTWABnIuN4AsIybiWRRNnuOrkx4BQdFGYRT7edMpneP+d+Wg8FWUY EJLOvoAA1ufiY7oGl/nDeXv2hwMMOfP7CdtaVjFVcdybJB/vi5CrsjYHoU2sDeq3L6fw 95qtnIR7g/kUBsVXZN+cmDSAGdg8bA7FOyYPDZnUMIFVPgFCFz+E8wFg1qJsiIicEGEF jiVjmyLQjep6SlFU4IyCFAlA+9qE0xwxTT7vaFVb0v3eIG+vyu/y7xIIe9AuitHO4mTE 4yaw== X-Gm-Message-State: ACgBeo1rsuOOY6pCJrxzfvspNikHn9f0OWJI5rIv84SMPIgmeTX0tIxV +xfcj89pehuuxBKI03mac2IO9UiZSVA4zw== X-Google-Smtp-Source: AA6agR7DyrGf5J9fcKw/vaWH3B5rZzoVSdtwRWHNmB+0/LA7MXkKcxLVaKaL4eMI21QOPvJrg0DfEw== X-Received: by 2002:a05:651c:2120:b0:25e:5145:38b0 with SMTP id a32-20020a05651c212000b0025e514538b0mr1222012ljq.191.1660309990243; Fri, 12 Aug 2022 06:13:10 -0700 (PDT) Received: from ubuntu-focal.. ([2a01:4f9:3a:1e26::2]) by smtp.gmail.com with ESMTPSA id f8-20020a2eb5a8000000b0025e72aae6bdsm356151ljn.28.2022.08.12.06.13.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Aug 2022 06:13:09 -0700 (PDT) From: Philipp Tomsich To: qemu-devel@nongnu.org Cc: Philipp Tomsich , Alistair Francis , Bin Meng , Palmer Dabbelt , qemu-riscv@nongnu.org Subject: [PATCH 2/2] target/riscv: fence: reconcile with specification Date: Fri, 12 Aug 2022 15:13:04 +0200 Message-Id: <20220812131304.1674484-2-philipp.tomsich@vrull.eu> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220812131304.1674484-1-philipp.tomsich@vrull.eu> References: <20220812131304.1674484-1-philipp.tomsich@vrull.eu> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::22b; envelope-from=philipp.tomsich@vrull.eu; helo=mail-lj1-x22b.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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Our decoding of fence-instructions is problematic in respect to the RISC-V ISA specification: - rs and rd are ignored, but need to be 0 - fm is ignored This change adjusts the decode pattern to enfore rs and rd being 0, and validates the fm-field (together with pred/succ for FENCE.TSO) to determine whether a reserved instruction is specified. While the specification allows UNSPECIFIED behaviour for reserved instructions, we now always raise an illegal instruction exception. Signed-off-by: Philipp Tomsich --- target/riscv/insn32.decode | 2 +- target/riscv/insn_trans/trans_rvi.c.inc | 19 ++++++++++++++++++- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index 089128c3dc..4e53df1b62 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -150,7 +150,7 @@ srl 0000000 ..... ..... 101 ..... 0110011 @r sra 0100000 ..... ..... 101 ..... 0110011 @r or 0000000 ..... ..... 110 ..... 0110011 @r and 0000000 ..... ..... 111 ..... 0110011 @r -fence ---- pred:4 succ:4 ----- 000 ----- 0001111 +fence fm:4 pred:4 succ:4 00000 000 00000 0001111 fence_i 000000000000 00000 001 00000 0001111 csrrw ............ ..... 001 ..... 1110011 @csr csrrs ............ ..... 010 ..... 1110011 @csr diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc index ca8e3d1ea1..515bb3b22a 100644 --- a/target/riscv/insn_trans/trans_rvi.c.inc +++ b/target/riscv/insn_trans/trans_rvi.c.inc @@ -795,7 +795,24 @@ static bool trans_srad(DisasContext *ctx, arg_srad *a) static bool trans_fence(DisasContext *ctx, arg_fence *a) { - /* FENCE is a full memory barrier. */ + switch (a->fm) { + case 0b0000: + /* normal fence */ + break; + + case 0b0001: + /* FENCE.TSO requires PRED and SUCC to be RW */ + if (a->pred != 0xb0011 || a->succ != 0b0011) { + return false; + } + break; + + default: + /* reserved for future use */ + return false; + } + + /* We implement FENCE(.TSO) is a full memory barrier. */ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); return true; }