From nobody Mon Feb 9 02:42:54 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=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1769519928; cv=none; d=zohomail.com; s=zohoarc; b=EYvmrwg7chxq7fpTq1xdyV9qbii+e9g+6dDnrI1kbISwx1ZARh3T0ov2bk/Ob+azYBp7Mm/7twYT/v/1j31WZ9MgEvG6gSG6eTnMIuMRMeevxSwM16ZtwgIPWlMoT36WuIhxdNJ+QwkiXCBE6OLMRHRU5+uTxL9hKXma9hKmCxg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1769519928; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=P7s36Gnhgk2Vos6o6JQQC1qIECPmtRU7o2DM59bcTqc=; b=Oi+70z8k5SDIcWztg81fRsjqHk1iwmhtFqHKtH5cyOldGqt7coPJyDqKL7XBHOLC16fwbrZt7jEYiDc0zbV5U/JqKdec4YSHBfYsTC+YIbvlvabxsbM2xewh+vJ5/Pq+8a59nWa5y3KxLN7yFwr0GQxXfc+t90aGVGQCT/tIIdo= 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 1769519928355715.781020842333; Tue, 27 Jan 2026 05:18:48 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vkiwI-0007J8-GA; Tue, 27 Jan 2026 08:17:02 -0500 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 1vkiw9-0007AE-Ob for qemu-devel@nongnu.org; Tue, 27 Jan 2026 08:16:54 -0500 Received: from mail-pl1-x643.google.com ([2607:f8b0:4864:20::643]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1vkiw5-0004bR-Mq for qemu-devel@nongnu.org; Tue, 27 Jan 2026 08:16:52 -0500 Received: by mail-pl1-x643.google.com with SMTP id d9443c01a7336-2a2ea96930cso35441405ad.2 for ; Tue, 27 Jan 2026 05:16:48 -0800 (PST) Received: from ZEVORN-PC.bbrouter ([183.195.23.113]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a802fb03b4sm117164345ad.82.2026.01.27.05.16.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jan 2026 05:16:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769519808; x=1770124608; darn=nongnu.org; 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=P7s36Gnhgk2Vos6o6JQQC1qIECPmtRU7o2DM59bcTqc=; b=WRtwW2N3Yv+x2notsZhM9RZGYW3cDWdzwNNOIK4crKKWFJsxtd1Lx7QEIoN0ZWicrN tg68YBe1hkdfx/YuN+HgEHVr2kmEONFk0tYcNLW8ZDRE/wlkrRvznGpvgsjO53y3wxZS uIJDZMbv9V/Z989VsJ/Jexg1NpIYIxVT27xB3dYAo0m3PI4j2cYnTTY7tt4GMepY4CQO ShzDtUdXsGm/RnyRD63rumF/2fc8YSSWL5J2Cjyh65yd14sPTTKO+LOoOapeWG7703c2 lP1WuRNgG5TCKeOXp+ZOZKGofkhRBPvkKzlXmRjXOg+v2I8csQpgJbCPU3Oqvh6o9+uz tmZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769519808; x=1770124608; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=P7s36Gnhgk2Vos6o6JQQC1qIECPmtRU7o2DM59bcTqc=; b=gfku3QrmHVnd5a7+sxOkjQ3fMY8z+5VrYWEiUPQN13pa6bYO2AfXt3/3CapQdO0lUU x374VGdhlZjKpprMv+ZV+RvWXsbaf6dGYBmzTgxrOnAOeByCcIB9t5U6ZnZi+nwdzcWy p8kg1za0wvRGWEOFCr8rLm7Uuf+CYW8mWXKZmxNEH+eXAEV3HxA22SY8Lza9H5fPiqsl NgVrKpiK5oEONoS3nUo9eSy4YI6nPxKmGgVn+mXc2SxEtPSY2Iza4EZb0K29ADqR8i9j 19hyPE373U2SD4mCE8VeE4DTsLDkxy2pHSR/7ykY76nKvX8VPpPPp5osnv+eIXFT6M1n Jb2w== X-Gm-Message-State: AOJu0YyFRvcHH/M56VLg0XpJpf/kfvPTA8pb6tQVIakF+VaLgHVUZEJq aIzU9XqAacvqUcCh53aiOwkk4u0KEJ0iwTgZl7HNnjwG3RpHky30atQ+ X-Gm-Gg: AZuq6aKJO0ZDubQzKyWOd2grYEPJKLsIW3IzmSIwl9A8xZb3vhKiEqcLQCPR5TSe/GK bRhlkZZvVNMgQMzPPZs8wSU9UNbs6JkgRKJnhrqDd2AzM0WreVH7mCG2XrKTfm0A/B+pSfUyZQ2 kO/3FVwV++JkAtPlJ/CcuvPn7ullkX4lxlETFJLvOZ0Kq8JOT2DtutQhbdpEZENKF7LwgLfeGWd D8l7DA0OrimVVs4/z4CI1uFHMDkKg+NqClMuftWSjB8dBHqJ5QD8MO7GzvlwKV+HPNJobLjXsRF UfpAcf9GYW3oQrxnaR9vK3+a+7R3TTLFakgdJlKvzFOqJaKNKkepZCs1kAWUsQF9d5kwlDntFNE IJc6EIJcqL3RLswJJ6awZaTjt/f9nL9AN2gbrvxMFOuWflvLfjdBza2HK/3kNrCL9ug6XxXFqqg VmZGWsMjSsddf4ozetR2T7nImui8BZjIWmo/jGZf99ueTBxSNNisypj5vY5fc= X-Received: by 2002:a17:902:f60d:b0:2a3:e7fe:645e with SMTP id d9443c01a7336-2a870d58d36mr17593205ad.1.1769519807845; Tue, 27 Jan 2026 05:16:47 -0800 (PST) From: Chao Liu To: Alistair Francis , Daniel Henrique Barboza , Palmer Dabbelt , Weiwei Li , Liu Zhiwei Cc: qemu-devel@nongnu.org, qemu-riscv@nongnu.org, wangjingwei@iscas.ac.cn, hust-os-kernel-patches@googlegroups.com, Chao Liu Subject: [RFC PATCH v3 5/7] target/riscv: add sdext enter Debug Mode on ebreak Date: Tue, 27 Jan 2026 21:15:49 +0800 Message-ID: <11206be920f2d74fcf25db2c8cf145720f69ecb0.1769517768.git.chao.liu.zevorn@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: 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=2607:f8b0:4864:20::643; envelope-from=chao.liu.zevorn@gmail.com; helo=mail-pl1-x643.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, FREEMAIL_FROM=0.001, 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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1769519930654154100 Content-Type: text/plain; charset="utf-8" RISC-V Debug Specification: https://github.com/riscv/riscv-debug-spec/releases/tag/1.0 Route EBREAK via helper_sdext_ebreak. If Sdext is enabled and the matching dcsr.ebreak* bit is set, enter Debug Mode with cause=3Debreak and stop with EXCP_DEBUG. Otherwise keep the normal breakpoint trap. Signed-off-by: Chao Liu --- target/riscv/helper.h | 1 + .../riscv/insn_trans/trans_privileged.c.inc | 6 ++-- target/riscv/op_helper.c | 36 +++++++++++++++++++ 3 files changed, 40 insertions(+), 3 deletions(-) diff --git a/target/riscv/helper.h b/target/riscv/helper.h index 6140b6340d..acff73051b 100644 --- a/target/riscv/helper.h +++ b/target/riscv/helper.h @@ -141,6 +141,7 @@ DEF_HELPER_1(tlb_flush_all, void, env) DEF_HELPER_4(ctr_add_entry, void, env, tl, tl, tl) /* Native Debug */ DEF_HELPER_1(itrigger_match, void, env) +DEF_HELPER_2(sdext_ebreak, void, env, tl) #endif =20 /* Hypervisor functions */ diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/= insn_trans/trans_privileged.c.inc index f8641b1977..377f551bb3 100644 --- a/target/riscv/insn_trans/trans_privileged.c.inc +++ b/target/riscv/insn_trans/trans_privileged.c.inc @@ -68,9 +68,9 @@ static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a) if (pre =3D=3D 0x01f01013 && ebreak =3D=3D 0x00100073 && post =3D=3D 0= x40705013) { generate_exception(ctx, RISCV_EXCP_SEMIHOST); } else { - tcg_gen_st_tl(tcg_constant_tl(ebreak_addr), tcg_env, - offsetof(CPURISCVState, badaddr)); - generate_exception(ctx, RISCV_EXCP_BREAKPOINT); + gen_update_pc(ctx, 0); + gen_helper_sdext_ebreak(tcg_env, tcg_constant_tl(ebreak_addr)); + ctx->base.is_jmp =3D DISAS_NORETURN; } return true; } diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 99736bbebb..dfe5388ab7 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -470,6 +470,42 @@ target_ulong helper_dret(CPURISCVState *env) #endif } =20 +void helper_sdext_ebreak(CPURISCVState *env, target_ulong pc) +{ +#ifndef CONFIG_USER_ONLY + CPUState *cs =3D env_cpu(env); + bool enter_debug =3D false; + + if (riscv_cpu_cfg(env)->ext_sdext && !env->debug_mode) { + if (env->virt_enabled) { + if (env->priv =3D=3D PRV_S) { + enter_debug =3D env->dcsr & DCSR_EBREAKVS; + } else if (env->priv =3D=3D PRV_U) { + enter_debug =3D env->dcsr & DCSR_EBREAKVU; + } + } else { + if (env->priv =3D=3D PRV_M) { + enter_debug =3D env->dcsr & DCSR_EBREAKM; + } else if (env->priv =3D=3D PRV_S) { + enter_debug =3D env->dcsr & DCSR_EBREAKS; + } else if (env->priv =3D=3D PRV_U) { + enter_debug =3D env->dcsr & DCSR_EBREAKU; + } + } + } + + env->badaddr =3D pc; + + if (enter_debug) { + riscv_cpu_enter_debug_mode(env, pc, DCSR_CAUSE_EBREAK); + cs->exception_index =3D EXCP_DEBUG; + cpu_loop_exit_restore(cs, GETPC()); + } + + riscv_raise_exception(env, RISCV_EXCP_BREAKPOINT, GETPC()); +#endif +} + target_ulong helper_mnret(CPURISCVState *env) { target_ulong retpc =3D env->mnepc; --=20 2.52.0