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From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper Subject: [PATCH v2 1/5] xen/x86: always consider '/' as a division in assembly Date: Thu, 12 Feb 2026 15:46:14 +0100 Message-ID: <20260212144618.43200-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260212144618.43200-1-roger.pau@citrix.com> References: <20260212144618.43200-1-roger.pau@citrix.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MA3P292CA0029.ESPP292.PROD.OUTLOOK.COM (2603:10a6:250:47::16) To CH7PR03MB7860.namprd03.prod.outlook.com (2603:10b6:610:24e::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH7PR03MB7860:EE_|CH5PR03MB7838:EE_ X-MS-Office365-Filtering-Correlation-Id: 3adfb911-633b-44f0-8a4e-08de6a457fbb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?aWF4Q2NsbXpocmk0NklDSm9XVFlHanVrS2cvSlhXcWVoNGRoY25ZVUJhMEU5?= =?utf-8?B?QnZ5TWExTi85Sm1yU1ArNjJXekIyK2NCY3A0SmthWDZuMGo4Q1dPZlNkU2Vo?= =?utf-8?B?bXA4MW4yRVhYSFBFT0l3N3NTeC8zN09LYU5wS0hSZllqTHRkN3pQSFQ0bVA1?= =?utf-8?B?NUFSOE50d3VNT0tYNW5GV0hiYVoxeFZkd2dWSE9UOStJa0lOc3hNaHFzSFdY?= =?utf-8?B?bVpkSTFjNXlwYkVwbWdxcm43d1JBZ1RnZFFIYVF1N3ZvVDNyTndJSS9xM0JY?= =?utf-8?B?VjgxY09HQ3hORmh2ZFZzeUwxNHBqUm9Nc0FaRXV5TnViZ29lTVpNTHZWOHhT?= =?utf-8?B?NXJuOGEyTnRiRTZ2TWRqUElKTERKT05Ia2xDZWtwZGhlN3ZBZ3hUS0gzVXk4?= =?utf-8?B?QkRUU1ZveEdXTkF4K2VSSGFRZGRqUDdldmhaY3pzdlFNSVNjQ2tMekRLK0lS?= =?utf-8?B?TFJuK2U3b2dvdklkNFZUcXZOYXNEdEY2dmlBSmt0S3lWQ25aZ3BZR3pkK0ZE?= =?utf-8?B?c0tYL0V0cWhHVFE5aHRRVXRibzB1a2dFM09FQzFJOGpNSGt1anNMWGlyb1ZW?= =?utf-8?B?NEtTQ1NiSkdHZWR3S3g3UENsRnVvUFFqazlvWEUzS2wyd2FVSHZoL28vT1o4?= =?utf-8?B?eWd0RFQyYlFib2lpS000ZHdLMzBQR3pvZGZ4NzBZWTdqL0d3K0orZUpETkJh?= =?utf-8?B?TnQxR1Q1Y3FpckZvY3krNVE1TEhnYkRiMUl6STY4Y3VNeW4zOEdQYUlGRkVU?= =?utf-8?B?RHFRa3c2VVdhNVpMMlZUcStxU25RQS9sMWV0UDFVSUMzeWxwZGNKSkI0NUJk?= =?utf-8?B?WmhJUnRRdktuRUQ3ZG5VWjMzL2lWNmVPbkJGQ2d4Y01lQkQ2MFI2QnNSQWxu?= =?utf-8?B?N3QvekNxYTlkR3JEc2FsSkZGQys1eTZ4bnppbm9LekV2dGs2STdwdHBPZjF5?= =?utf-8?B?ckN5SEpCU01KNkl5MDJKckRBZWhyMXBBVFNUaUJaUmMzeTNWRmlkRFBrdUN4?= =?utf-8?B?YW14dkVPUlNNdjVPN0JPS0Z0MVVyd29yUkxaK3FNalNJYzY2LzBEMzk5WTVx?= =?utf-8?B?VDNNWGRBbGk0ZnFXckExUUVEQmw5dDJrMGxOK0ZhZkZzRE5OL1VwUDIzWEVI?= =?utf-8?B?ZU1TK1FUZXVianRHeldsN3NzMDFseHFBZnBMVnQxU0pKTXk2citTQmxNeXN3?= =?utf-8?B?Ulh0VWlzdkJ1N1NGVHo5cUQ1K2I4WGg0bjAzdnRtZU52RllUUU8vVnQwYlFG?= =?utf-8?B?dU1CQ0VGUjI2bFFwelRHdkR6cGZuSVFheGFWQzNpVzd1Ukc1a2tBZFRiR0lE?= =?utf-8?B?QWNLV3M1aXZ2ZGRZTnFqZ2VzNjlycTFoV05CcjU0QlhrWVdFcHBvSHZ2dGRC?= =?utf-8?B?NFJ4ajhMUG9qVnpDSkJ4ZVJkZXN1dzNxcjhZL21yT2UyOVduOTdrQ2NJQ1FH?= =?utf-8?B?bnRkdVpjcGVXVFlJYUg4MURrWWFnbmpCdUFpenpKWWFVcXpkNjkxckVNb3gr?= =?utf-8?B?b0JHTjZteUcwZkJpZXdjNVUvOWhZUXlFaUY5MUhjSFEyL1ZqMTdBOE9JTWhs?= =?utf-8?B?YzJtNU9OSCtWT0FydDYwUk40NjdWUFNlcm8vYzBnOVlQaTRDQi9nN1pBeWVm?= =?utf-8?B?Mkd0QldyQWFMdmtsdFB2WDR3eFFoZUR5SUpRU1JzR3FIZkZ2QllqSEhNUmc3?= =?utf-8?B?QzJrTmJKQ3I3S25vbmV6bHVPNi9CZWhrRG1RSkNxUmYrNk1OcGJEWGJnVE5Z?= =?utf-8?B?VEcyd1NOS2hMTm1PeDFEaDhWbzczNlhsQjk4SU1kMUlDT2ExeXIvMkk0MGpB?= =?utf-8?B?cU5LWWg0R3pQMlorZUV2eW1oL0V2MFZiejRGeU4veHlUaWhTYjVZNy85Ri8v?= =?utf-8?B?ZFVnb2pBZVNJSUQvMUY1WTM4QTBHaEw2dTJvVjIzeFJqVlhsUXZhZGtyUnZJ?= =?utf-8?B?aWVCY0kwQk1xWS9jYUZlajllY0pBMjVhTy93Wk8vWjR3YnJkYkE5OFlTSHZy?= =?utf-8?B?cTRWZmlWQnFnMExrYnRUMDhJK2MzVzIzZjluVm5lQXBjNHR1a3pqOTcyUHJa?= =?utf-8?B?NDU4bVZQOGNZUy95RzZkcGcweVNhUkJiQVhweHBzZTNGT2h2UnNPTlQrNld0?= =?utf-8?Q?ZVIk=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH7PR03MB7860.namprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(366016);DIR:OUT;SFP:1101; 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This is incorrect with Xen's usage, which does use '/' in assembly files as a mathematical operator. The behavior of the assembler can be altered by passing the --divide option; unconditionally pass this option when available to force the expected behavior. Reported-by: Jan Beulich Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- Changes since v1: - Move option add to x86 specific makefile. --- xen/arch/x86/arch.mk | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk index 0203138a819a..2e06ae2582dc 100644 --- a/xen/arch/x86/arch.mk +++ b/xen/arch/x86/arch.mk @@ -123,3 +123,8 @@ endif =20 # Set up the assembler include path properly for older toolchains. CFLAGS +=3D -Wa,-I$(objtree)/include -Wa,-I$(srctree)/include + +# The GNU assembler will interpret '/' as a comment start marker instead o= f a +# divide for some ELF targets. Pass --divide when when available to signa= l '/' +# is always used as an operator in assembly. +$(call cc-option-add,CFLAGS,CC,-Wa$$(comma)--divide) --=20 2.51.0