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client-ip=217.111.95.7; helo=mta.arri.de; Received: from mta.arri.de (217.111.95.7) by DB5PEPF00014B8D.mail.protection.outlook.com (10.167.8.201) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8489.16 via Frontend Transport; Mon, 24 Feb 2025 12:54:30 +0000 Received: from N9W6SW14.arri.de (10.30.5.17) by mta.arri.de (10.10.18.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.38; Mon, 24 Feb 2025 13:54:30 +0100 From: Christian Eggers To: Russell King , Yuntao Liu , "Russell King (Oracle)" , Arnd Bergmann , Linus Walleij , Greg Kroah-Hartman , Catalin Marinas , Nathan Chancellor , CC: , Christian Eggers , "kernel test robot" Subject: [PATCH v2 1/2] ARM: substitute OVERLAY description in linker script Date: Mon, 24 Feb 2025 13:54:13 +0100 Message-ID: <20250224125414.2184-1-ceggers@arri.de> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Originating-IP: [10.30.5.17] X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB5PEPF00014B8D:EE_|VI1PR07MB10115:EE_ X-MS-Office365-Filtering-Correlation-Id: 44d52550-3d93-4ab9-5f0e-08dd54d2612c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|7416014|1800799024|13003099007; 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X-OriginatorOrg: arri.de X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2025 12:54:30.6016 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 44d52550-3d93-4ab9-5f0e-08dd54d2612c X-MS-Exchange-CrossTenant-Id: e6a73a5a-614d-4c51-b3e3-53b660a9433a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e6a73a5a-614d-4c51-b3e3-53b660a9433a;Ip=[217.111.95.7];Helo=[mta.arri.de] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B8D.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR07MB10115 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250224_045447_341785_26F6BDD7 X-CRM114-Status: GOOD ( 13.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org If linker garbage collection is active, we must ensure that the vectors are not removed during linking (by using the KEEP keyword). But it seems that the LLD linker doesn't support using the KEEP() keyword within an overlay description. The GNU linker manual shows an alternative way to accomplish the same result without using the overlay statement: https://sourceware.org/binutils/docs/ld/Overlay-Description.html Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202502222158.UhwuvDZv-lkp@intel.com/ Signed-off-by: Christian Eggers --- v2: - added this patch as the kernel test robot complained when using the LLD linker: https://lore.kernel.org/all/202502222158.UhwuvDZv-lkp@intel.com/ arch/arm/include/asm/vmlinux.lds.h | 21 +++++++++++++-------- arch/arm/kernel/vmlinux-xip.lds.S | 2 ++ arch/arm/kernel/vmlinux.lds.S | 2 ++ 3 files changed, 17 insertions(+), 8 deletions(-) diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h index d60f6e83a9f7..7ba309f826f9 100644 --- a/arch/arm/include/asm/vmlinux.lds.h +++ b/arch/arm/include/asm/vmlinux.lds.h @@ -31,7 +31,7 @@ * https://github.com/ClangBuiltLinux/linux/issues/1609 */ #ifdef CONFIG_LD_IS_LLD -#define NOCROSSREFS +#define NOCROSSREFS(...) #endif /* Set start/end symbol names to the LMA for the section */ @@ -123,16 +123,19 @@ */ #define ARM_VECTORS \ __vectors_lma = .; \ - OVERLAY 0xffff0000 : NOCROSSREFS AT(__vectors_lma) { \ - .vectors { \ + /* Note: The LLD linker seems not to support marking input */ \ + /* sections with KEEP() inside a OVERLAY statement */ \ + .vectors 0xffff0000 : AT (__vectors_lma) { \ *(.vectors) \ - } \ - .vectors.bhb.loop8 { \ + } \ + .vectors.bhb.loop8 0xffff0000 : AT (__vectors_lma + \ + SIZEOF(.vectors)) { \ *(.vectors.bhb.loop8) \ - } \ - .vectors.bhb.bpiall { \ + } \ + .vectors.bhb.bpiall 0xffff0000 : AT (__vectors_lma + \ + SIZEOF(.vectors) + \ + SIZEOF(.vectors.bhb.loop8)) { \ *(.vectors.bhb.bpiall) \ - } \ } \ ARM_LMA(__vectors, .vectors); \ ARM_LMA(__vectors_bhb_loop8, .vectors.bhb.loop8); \ @@ -150,6 +153,8 @@ \ PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors)); +#define ARM_NOCROSSREFS NOCROSSREFS(.vectors .vectors.bhb.loop8 .vectors.bhb.bpiall) + #define ARM_TCM \ __itcm_start = ALIGN(4); \ .text_itcm ITCM_OFFSET : AT(__itcm_start - LOAD_OFFSET) { \ diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S index 5eddb75a7174..496d609c24c8 100644 --- a/arch/arm/kernel/vmlinux-xip.lds.S +++ b/arch/arm/kernel/vmlinux-xip.lds.S @@ -159,6 +159,8 @@ SECTIONS ARM_ASSERTS } +ARM_NOCROSSREFS + /* * These must never be empty * If you have to comment these two assert statements out, your diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index de373c6c2ae8..514a030b7d5f 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -158,6 +158,8 @@ SECTIONS ARM_ASSERTS } +ARM_NOCROSSREFS + #ifdef CONFIG_STRICT_KERNEL_RWX /* * Without CONFIG_DEBUG_ALIGN_RODATA, __start_rodata_section_aligned will From patchwork Mon Feb 24 12:54:14 2025 Content-Type: text/plain; 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X-OriginatorOrg: arri.de X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2025 12:54:34.2186 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 53f2f877-6beb-4e29-4658-08dd54d26354 X-MS-Exchange-CrossTenant-Id: e6a73a5a-614d-4c51-b3e3-53b660a9433a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e6a73a5a-614d-4c51-b3e3-53b660a9433a;Ip=[217.111.95.7];Helo=[mta.arri.de] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B89.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR07MB8102 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250224_045447_448526_0642E68A X-CRM114-Status: GOOD ( 10.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Without this, the vectors are removed if LD_DEAD_CODE_DATA_ELIMINATION is enabled. At startup, the CPU (silently) hangs in the undefined instruction exception as soon as the first timer interrupt arrives. Fixes: ed0f94102251 ("ARM: 9404/1: arm32: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION") Signed-off-by: Christian Eggers --- v2: - changed patch title arch/arm/include/asm/vmlinux.lds.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h index 7ba309f826f9..288057e07e69 100644 --- a/arch/arm/include/asm/vmlinux.lds.h +++ b/arch/arm/include/asm/vmlinux.lds.h @@ -126,16 +126,16 @@ /* Note: The LLD linker seems not to support marking input */ \ /* sections with KEEP() inside a OVERLAY statement */ \ .vectors 0xffff0000 : AT (__vectors_lma) { \ - *(.vectors) \ + KEEP(*(.vectors)) \ } \ .vectors.bhb.loop8 0xffff0000 : AT (__vectors_lma + \ SIZEOF(.vectors)) { \ - *(.vectors.bhb.loop8) \ + KEEP(*(.vectors.bhb.loop8)) \ } \ .vectors.bhb.bpiall 0xffff0000 : AT (__vectors_lma + \ SIZEOF(.vectors) + \ SIZEOF(.vectors.bhb.loop8)) { \ - *(.vectors.bhb.bpiall) \ + KEEP(*(.vectors.bhb.bpiall)) \ } \ ARM_LMA(__vectors, .vectors); \ ARM_LMA(__vectors_bhb_loop8, .vectors.bhb.loop8); \