From mboxrd@z Thu Jan 1 00:00:00 1970 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 ADBFBC87FC9 for ; Mon, 28 Jul 2025 13:34:37 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ugNzP-0004O4-PH; Mon, 28 Jul 2025 09:34:03 -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 1ugNqn-0008AD-Dy for qemu-trivial@nongnu.org; Mon, 28 Jul 2025 09:25:15 -0400 Received: from mail-wr1-x42f.google.com ([2a00:1450:4864:20::42f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ugNql-0002CK-62 for qemu-trivial@nongnu.org; Mon, 28 Jul 2025 09:25:09 -0400 Received: by mail-wr1-x42f.google.com with SMTP id ffacd0b85a97d-3b7886bee77so1061254f8f.0 for ; Mon, 28 Jul 2025 06:25:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1753709103; x=1754313903; darn=nongnu.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=4SIfWPYbShImsqT7HrwVgY0YOYtxv8A2n2sHfqFMaLM=; b=RCS97ccPf8AQpiWDrymZ4TjmjJG8DLY0iUg5yLcwEapXsXBSj4MM/vy56ht9B17PU2 cmvdVyaxXW5dHdJlF+N81r1bbR0Yx8FjbcTQUbiJeESHyGvI2w7FYbbxXYeCZLnNO6w+ PGv4Wn+ftFV9vXdIEW/lA23+UiOyXUvmua9gOD3SHAxfdF3euiI1rf1JeWw0FQ0n17yC pJ3dBcmEP4L3DkDXkOj5fmKdadhmnjoeNBN8jcxJ5jZrT3078m36mVNYf6lO5KvgU0oh w+qLShFfqI910btB90Z6qGHLuniMwGwTSRGT6VhXYtEKiW+sffgxp8NMSw3/3moG4RAt ZkuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753709103; x=1754313903; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=4SIfWPYbShImsqT7HrwVgY0YOYtxv8A2n2sHfqFMaLM=; b=up9i+L69qVhgtWQN8qpIwVRz9y3Z3uNnQmJqEVo3bofJYZPdCWM0QJcJVP0KHvKPDR W2ruInfVePFR+uVBKVh5m6VXpPSkIRTcXgD+0zoKe+64niAJIooBs8MlytY+b7SREKAl kiq18dYU7go2Tx9vH1bcg0g7QexVX2dkucyDlBwNMBDau2o+7BqmbZD66aIcSBAkKpkI 9VVFUrCSPLwcuFZwTCNg+47Q8c47Oe2YyayO7nygwkWKEhTe3+d+DvDMJsvxfpqK6ozz ZgjGjNWN0Ns3XDZ95vS2F78T3q1JgaTyIO8CxuDKbc+S8Psn7CvrQ0MSQjpsZ/8CrIy/ yKbw== X-Forwarded-Encrypted: i=1; AJvYcCUj4AVc+3mU29n6sSnhyvKETI0Zc/gewI8FF8NtlB7Ou3DFPEfU+SVuVYyjsffn70XwAosoCdo4NOc76SU=@nongnu.org X-Gm-Message-State: AOJu0Yzy4DoGNQLVenxpmx79Oc7VuP5psnHcxc1GTBKMAGyCUCo8rTTv IV61pHL+2dXLeivawCZVE/AA0pKO3u6hm/C/PT7paScyBE4m9Tincsm1ccII6/xvQCo= X-Gm-Gg: ASbGncvq+R7/e6kYCsDuFN2oo/O5ZeatrdNsQvhDQHUsei1t6Oj87FmFqa0SEKZpazF k+To2OMngww38V6Jpf0LVPUHPFlvCIja42FqNjNBH9QVk8XZOlk/L6poYlPnfYiVkb5o4pdKM+8 xXqJQksCNK1t+SqasvSf5NRfXIlM2nv5ziFjwLHkkSDGrZIhVz9hHvcVCAvJJfytegQXqehMMNH ycu35qOL1XZqIUiMtr/TWhI7rg3fZRefYDUjoQswXal4uC3DjfT9+Y6+PsB2doVRBqWh2nA2XBP igPsXfDJ1Tclvy1FAMYTII/lNAcTwyvt6lQXuzyvVQHWXZFUiubKUv7HKfw/Q/SHeUmRUDkSvdC 2gPkYqeZouEQNWidk9R8CZabQfQtqqjYF3f4YtbO/dCVPCrwTaEJqrNP7J38CuSwCdlqiCzGO7L k8 X-Google-Smtp-Source: AGHT+IFlBp8rlNK7Bj+3/EiMxH3Bflfvy8LEFfd13yfKvnTmNrh4Miv8S6o1a+zDrQbRNgdSk3KSGw== X-Received: by 2002:a05:6000:1a88:b0:3b7:664a:8416 with SMTP id ffacd0b85a97d-3b7765f4e98mr7465589f8f.23.1753709103031; Mon, 28 Jul 2025 06:25:03 -0700 (PDT) Received: from [192.168.69.209] (88-187-86-199.subs.proxad.net. [88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458705d42b0sm154634045e9.33.2025.07.28.06.25.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Jul 2025 06:25:02 -0700 (PDT) Message-ID: <43b37539-e4eb-465c-85e8-b7c83324910f@linaro.org> Date: Mon, 28 Jul 2025 15:25:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] hw/mips/malta: Silence warning from ubsan To: Thomas Huth , qemu-devel@nongnu.org Cc: Aurelien Jarno , Jiaxun Yang , qemu-trivial@nongnu.org References: <20250728115152.187728-1-thuth@redhat.com> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20250728115152.187728-1-thuth@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=philmd@linaro.org; helo=mail-wr1-x42f.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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-trivial@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-trivial-bounces+qemu-trivial=archiver.kernel.org@nongnu.org Sender: qemu-trivial-bounces+qemu-trivial=archiver.kernel.org@nongnu.org Hi Thomas, On 28/7/25 13:51, Thomas Huth wrote: > From: Thomas Huth > > When compiling QEMU with --enable-ubsan there is a undefined behavior > warning when using the malta machine: > > hw/mips/malta.c:1200:32: runtime error: addition of unsigned offset > to 0x7fb620600000 overflowed to 0x7fb6205fffff > SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior hw/mips/malta.c:1200:32 > > To fix the issue, check the bios_size whether we really loaded the > firmware before trying to byte-swap the instructions here. > > Signed-off-by: Thomas Huth > --- > hw/mips/malta.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/mips/malta.c b/hw/mips/malta.c > index cbdbb210568..47dd4016cfd 100644 > --- a/hw/mips/malta.c > +++ b/hw/mips/malta.c > @@ -1190,7 +1190,7 @@ void mips_malta_init(MachineState *machine) > * In little endian mode the 32bit words in the bios are swapped, > * a neat trick which allows bi-endian firmware. > */ > - if (!TARGET_BIG_ENDIAN) { > + if (!TARGET_BIG_ENDIAN && bios_size > 0) { > uint32_t *end, *addr; > const size_t swapsize = MIN(bios_size, 0x3e0000); > addr = rom_ptr(FLASH_ADDRESS, swapsize); What about: -- >8 -- @@ -1180,7 +1180,7 @@ void mips_malta_init(MachineState *machine) } else { bios_size = -1; } - if ((bios_size < 0 || bios_size > BIOS_SIZE) && + if ((bios_size <= 0 || bios_size > BIOS_SIZE) && machine->firmware && !qtest_enabled()) { error_report("Could not load MIPS bios '%s'", machine->firmware); exit(1); --- ?