From patchwork Mon Mar 10 15:12:16 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 14010250 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4DB1022D4CF for ; Mon, 10 Mar 2025 15:14:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741619644; cv=none; b=V9w4gqeSd7DgSHKNKfQr8knbK7j6yp5TiufBCKHc5TSkrQrBLLt/hcx2k8Ozg7k0XnK8bzciQ+/Pu/JrSwn7tLMryNJVqrJKaz8iD2jqjcYaKu3XG7vZL7GrsZ0w/51pJ5hf1/ZzILPhzEqQzmufV+EWJnS5CsKUX5bZkvPKouA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741619644; c=relaxed/simple; bh=B4l5ww4xM3ybuxVDnFD7O4s6SCugiqPi0tOYv0B/adg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=U6N/X8UwZJOgZS6Jdv7x8MxQuTeitRbHJ1N3xUZcqP4E/7jSyGR7e2hzW8XC74uE21hVeU9/s4TTeOiwmCb2EucR3UO6/3pKM2Mffd/ppDMg1TRezYKZaQ/l1udAS0hsEjGU7WxXu9eNjV0HOEL7oFmwn9G0yaKyZbC/j0t4RpQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=phyKIH0L; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="phyKIH0L" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-22398e09e39so79079365ad.3 for ; Mon, 10 Mar 2025 08:14:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1741619642; x=1742224442; darn=vger.kernel.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=z9Vwlc46bZsQyt2QxW9m2l1M9vTOam7Mm6HyDDfLEZk=; b=phyKIH0LB85yJ+LguS7wKtU89NW1nV7XXxzNvx9aR+JVuimcTKgh1gW7BD+Qb8tM7P kFXzFlnt2iMQJMvrt1wmretsUcNW/Q3G4gIovHKC9kYALAIw7xGZiuFLoTkjgXipYm8E whBOyPY8lGh/D/lRk0QpQJAsiOWhpGvxFvpwYsy00ieeJUFDbWxx9gsJgxbI7j++ANhY /IzdOnBb+m8CsqYjjuOgIwoYfGdb/9KNs20lvaFsJGK7wYtpSGjFVi5ffjaFDIQ1eoEo 9Sxqf7E+iOFYsuB8xshlSYOrRX5lms7JPrfx1rNBagNwCLap4PrKxSoxtI+h2CF5jCnl wYgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741619642; x=1742224442; 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=z9Vwlc46bZsQyt2QxW9m2l1M9vTOam7Mm6HyDDfLEZk=; b=dzT6Saz6C0fbOHw6DWX+i0AaU7EGGPCf9Qg+qxz4Qi2wkOp2TGytA7KiSkdowZfCPv HaWoYHkRPMMESd8SyigvprckjgHV6dicnszrtEIw0JJlucMm4TN/bB3W+EaDGlnhCeMP JEzzzSaegFyWi9pe0T24/Jp4Be3t/iUt3ja9I6n1tDFIsxgWQE+qWcNQ/Ul3dr+qTn2j Rcs1J2sDlnQL6xHaBTlHtnCroKQlorxNueThGHmVAmsauNU24QewJWYzo4t6mNYKFPtf ij8Udj961dFBBN3XWqxQaDUkQKDuc1H2vaL5Aq+piGAnt+Ns/qwRiKClX8GmZJbf1X1D ra8A== X-Forwarded-Encrypted: i=1; AJvYcCVooDjB5vZ08RJzMJw2Ejswlk7tyP62wHpL6cG5odJj35TR6Sd0pdgH5QyX2n4WqGGYlrHFBBxGiwogwa6m998=@vger.kernel.org X-Gm-Message-State: AOJu0YxjdHbn8EUw4VAmxEbamVHDx83gYpU9S5bwyxrcvJv181XCEhfJ bw3FbUn77b+55irKl+HYhrp8Wu20wbyJRkUVl2C83kaHVfHYFOghlJJN2FeCXt0= X-Gm-Gg: ASbGncuMIO+xZDWd87CNcB/dOPEVodHzGV89dzyjD4eGh+E9CwZqpjtDtgNtYUAZ9Ab 9QG4S6ieUsTlzAyxTi3dUqgWkcfIY4/8nTtM0zOidzAEaYfcdgEJWyNIZM6srivDWis+yDaAQfy MQ+2OwQ6snbd+aYXw0aiIdhj14znMJQ5BdOlgQ94pblsMXylGBK4PzOKGTLjS8IE8ulAUVDTDnc f2iDFg0FD+9YY4irv3yri2SdY8kxd1czZiCpd0clTqbJzER1brLg5qnatjHSxyproGIZM2smR6t CBi8tGKmfy1sN2epKShwC0EeDHNV9Dv176XG1sJc7ZWstA== X-Google-Smtp-Source: AGHT+IE/Wftdkd3zlZdL/ywUH78DLaDAVcrFF4WfEuA9Q1JYQZM9C8xhDZMPOQ9HkccIr+uMejIbbw== X-Received: by 2002:a17:903:298b:b0:21f:4649:fd49 with SMTP id d9443c01a7336-22428c221dbmr239345965ad.49.1741619642512; Mon, 10 Mar 2025 08:14:02 -0700 (PDT) Received: from carbon-x1.. ([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109e99dfsm79230515ad.91.2025.03.10.08.13.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 08:14:02 -0700 (PDT) From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Samuel Holland Subject: [PATCH v3 09/17] riscv: misaligned: factorize trap handling Date: Mon, 10 Mar 2025 16:12:16 +0100 Message-ID: <20250310151229.2365992-10-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250310151229.2365992-1-cleger@rivosinc.com> References: <20250310151229.2365992-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 misaligned accesses traps are not nmi and should be treated as normal one using irqentry_enter()/exit(). Since both load/store and user/kernel should use almost the same path and that we are going to add some code around that, factorize it. Signed-off-by: Clément Léger --- arch/riscv/kernel/traps.c | 49 ++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 8ff8e8b36524..55d9f3450398 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -198,47 +198,38 @@ asmlinkage __visible __trap_section void do_trap_insn_illegal(struct pt_regs *re DO_ERROR_INFO(do_trap_load_fault, SIGSEGV, SEGV_ACCERR, "load access fault"); -asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) +enum misaligned_access_type { + MISALIGNED_STORE, + MISALIGNED_LOAD, +}; + +static void do_trap_misaligned(struct pt_regs *regs, enum misaligned_access_type type) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); + irqentry_state_t state = irqentry_enter(regs); + if (type == MISALIGNED_LOAD) { if (handle_misaligned_load(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_exit_to_user_mode(regs); + "Oops - load address misaligned"); } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_load(regs)) + if (handle_misaligned_store(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_nmi_exit(regs, state); + "Oops - store (or AMO) address misaligned"); } + + irqentry_exit(regs, state); } -asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); - - irqentry_exit_to_user_mode(regs); - } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); + do_trap_misaligned(regs, MISALIGNED_LOAD); +} - irqentry_nmi_exit(regs, state); - } +asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +{ + do_trap_misaligned(regs, MISALIGNED_STORE); } + DO_ERROR_INFO(do_trap_store_fault, SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault"); DO_ERROR_INFO(do_trap_ecall_s,