From patchwork Thu Jun 8 07:23:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tommy Wu X-Patchwork-Id: 13271701 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 59C08C7EE2E for ; Thu, 8 Jun 2023 07:24:08 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q79zX-0002HO-U6; Thu, 08 Jun 2023 03:23:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q79zW-0002H7-Ux for qemu-devel@nongnu.org; Thu, 08 Jun 2023 03:23:30 -0400 Received: from mail-oo1-xc2f.google.com ([2607:f8b0:4864:20::c2f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1q79zV-0006fI-Bz for qemu-devel@nongnu.org; Thu, 08 Jun 2023 03:23:30 -0400 Received: by mail-oo1-xc2f.google.com with SMTP id 006d021491bc7-55b00ad09feso198959eaf.1 for ; Thu, 08 Jun 2023 00:23:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1686209008; x=1688801008; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=pBp5P34pomIf/TRV0HfYpflM8Flhf0grZdqWN9dKPh0=; b=jcxde9qPNrfNLIOo+NX7t4h8IA4Ei+JWWsmqB+P5OzueESgCLuHDNIMrdbH3YQAK76 r3vSdfs1dI94yhLhfLJNIxZKW8RHy7KJnMrMy6yBYBhPfNsdsxKpm35e+N8z0+H8xIXi kPVsNkqXWOHKUML3KlMi2pHFJbujkbc7/26TpsxGEcYihJX5glOmzhIbwTX6wvKtID2D psJNricnNTHs/yELjrsqWVgnj9c+lSeGUbV1+fT+llJlAm1vQ0dHlTLDdH1d2hfZ6AOu EZ9DTidqPZnL4UTdHnXABfIcKasySNPyyN9oJuIH63UwbFYkwci3ECPBTKIDgVXR6pio 9iiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686209008; x=1688801008; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=pBp5P34pomIf/TRV0HfYpflM8Flhf0grZdqWN9dKPh0=; b=DHLInp4ASSoeBcbHXdep4XrTcq2DxzVHw3SU5NjD+axPszTYB4HsvDisv0zJ5ToWw4 RXJ/HnBwqcvkA1ZpjFtHVm4U5ulY+usmjfodMTY8NZHnGbHQ0JKZ+Sug9JIp/QZJrE2q ayGJP5AQCTXFdbUGoPNfBuxZ+gUsXiCyf7DGpQY9JUh2ddyx2LleU3UP6aF28IhrKZbJ vIxF3AHMoarCKrtjnnY65/kAAQvZrpf+NykBdqoYW0loG1ZUa+ckbAiOKdz9vEon8Qtc bkCIN2z6SSjmjJ86ED4L0d5dAOAf+OgaUxCaDPcIJ/cCMWNrKzcEuVHySMRPqS+q6vP+ EREQ== X-Gm-Message-State: AC+VfDxmP5a5N05UhoY4uvYVqbVKMUZcxe5vl2Z/WCIoX5NySh1LzqOK oPOEXIGcnPJ0FsFctpxoI/eB/IJSBUKgeOr15FfeGUcNQVvX69NZ/2SmclySbCMSNzIHOhszLxp bP/TuAgEVrG4KtINPFOpFiS6Y/L337A+CNYM0tzaZx8DoNLJBR9WINTWUekadf2a62W8MJ98n3v aT X-Google-Smtp-Source: ACHHUZ5y77BAl2HVL2EpguyRmXdU8MayXA9SXKTbFUbIRppFIzPi1FqYtZTKWl8N43HZjj1AkxORsQ== X-Received: by 2002:a4a:b384:0:b0:558:b224:ce9f with SMTP id p4-20020a4ab384000000b00558b224ce9fmr5878171ooo.7.1686209007656; Thu, 08 Jun 2023 00:23:27 -0700 (PDT) Received: from sw05.internal.sifive.com ([64.62.193.194]) by smtp.gmail.com with ESMTPSA id x144-20020a4a4196000000b0051134f333d3sm274293ooa.16.2023.06.08.00.23.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jun 2023 00:23:27 -0700 (PDT) From: Tommy Wu To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: frank.chang@sifive.com, palmer@dabbelt.com, alistair.francis@wdc.com, bin.meng@windriver.com, liweiwei@iscas.ac.cn, dbarboza@ventanamicro.com, zhiwei_liu@linux.alibaba.com, richard.henderson@linaro.org, Tommy Wu Subject: [PATCH v4 4/4] target/riscv: Add Smrnmi mnret instruction. Date: Thu, 8 Jun 2023 00:23:14 -0700 Message-Id: <20230608072314.3561109-5-tommy.wu@sifive.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230608072314.3561109-1-tommy.wu@sifive.com> References: <20230608072314.3561109-1-tommy.wu@sifive.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::c2f; envelope-from=tommy.wu@sifive.com; helo=mail-oo1-xc2f.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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Signed-off-by: Frank Chang Signed-off-by: Tommy Wu --- target/riscv/helper.h | 1 + target/riscv/insn32.decode | 3 ++ .../riscv/insn_trans/trans_privileged.c.inc | 12 +++++ target/riscv/op_helper.c | 49 +++++++++++++++++++ 4 files changed, 65 insertions(+) diff --git a/target/riscv/helper.h b/target/riscv/helper.h index 98e97810fd..00f1032086 100644 --- a/target/riscv/helper.h +++ b/target/riscv/helper.h @@ -112,6 +112,7 @@ DEF_HELPER_6(csrrw_i128, tl, env, int, tl, tl, tl, tl) #ifndef CONFIG_USER_ONLY DEF_HELPER_1(sret, tl, env) DEF_HELPER_1(mret, tl, env) +DEF_HELPER_1(mnret, tl, env) DEF_HELPER_1(wfi, void, env) DEF_HELPER_1(tlb_flush, void, env) DEF_HELPER_1(tlb_flush_all, void, env) diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index 73d5d1b045..e0698f9dfb 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -111,6 +111,9 @@ wfi 0001000 00101 00000 000 00000 1110011 sfence_vma 0001001 ..... ..... 000 00000 1110011 @sfence_vma sfence_vm 0001000 00100 ..... 000 00000 1110011 @sfence_vm +# *** NMI *** +mnret 0111000 00010 00000 000 00000 1110011 + # *** RV32I Base Instruction Set *** lui .................... ..... 0110111 @u auipc .................... ..... 0010111 @u diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc index 528baa1652..ef7f102069 100644 --- a/target/riscv/insn_trans/trans_privileged.c.inc +++ b/target/riscv/insn_trans/trans_privileged.c.inc @@ -104,6 +104,18 @@ static bool trans_mret(DisasContext *ctx, arg_mret *a) #endif } +static bool trans_mnret(DisasContext *ctx, arg_mnret *a) +{ +#ifndef CONFIG_USER_ONLY + gen_helper_mnret(cpu_pc, cpu_env); + tcg_gen_exit_tb(NULL, 0); /* no chaining */ + ctx->base.is_jmp = DISAS_NORETURN; + return true; +#else + return false; +#endif +} + static bool trans_wfi(DisasContext *ctx, arg_wfi *a) { #ifndef CONFIG_USER_ONLY diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index f563dc3981..b27beec871 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -359,6 +359,55 @@ target_ulong helper_mret(CPURISCVState *env) return retpc; } +target_ulong helper_mnret(CPURISCVState *env) +{ + if (!riscv_cpu_cfg(env)->ext_smrnmi) { + /* RNMI feature is not presented. */ + riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } + + if (!(env->priv >= PRV_M)) { + riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } + + /* Get return PC from mnepc CSR. */ + target_ulong retpc = env->mnepc; + if (!riscv_has_ext(env, RVC) && (retpc & 0x3)) { + riscv_raise_exception(env, RISCV_EXCP_INST_ADDR_MIS, GETPC()); + } + + /* Get previous privilege level from mnstatus CSR. */ + target_ulong prev_priv = get_field(env->mnstatus, MNSTATUS_MNPP); + + if (riscv_cpu_cfg(env)->pmp && + !pmp_get_num_rules(env) && (prev_priv != PRV_M)) { + riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } + + riscv_cpu_set_mode(env, prev_priv); + env->mnstatus = set_field(env->mnstatus, MNSTATUS_NMIE, true); + + target_ulong prev_virt = get_field(env->mnstatus, MNSTATUS_MNPV); + + /* + * If MNRET changes the privilege mode to a mode + * less privileged than M, it also sets mstatus.MPRV to 0. + */ + if (prev_priv < PRV_M) { + env->mstatus = set_field(env->mstatus, MSTATUS_MPRV, false); + } + + if (riscv_has_ext(env, RVH)) { + if (prev_virt) { + riscv_cpu_swap_hypervisor_regs(env); + } + + riscv_cpu_set_virt_enabled(env, prev_virt); + } + + return retpc; +} + void helper_wfi(CPURISCVState *env) { CPUState *cs = env_cpu(env);