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Shutemov" , Ingo Molnar , Binbin Wu , Alexey Dobriyan , Rick Edgecombe , Sohil Mehta , Yu-cheng Yu , Dave Hansen , Valentin Obst , linux-kselftest@vger.kernel.org, LKML , llvm@lists.linux.dev, x86@kernel.org, John Hubbard Subject: [PATCH v2 3/6] selftests/x86: build sysret_rip.c with clang Date: Mon, 27 May 2024 14:00:39 -0700 Message-ID: <20240527210042.220315-4-jhubbard@nvidia.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240527210042.220315-1-jhubbard@nvidia.com> References: <20240527210042.220315-1-jhubbard@nvidia.com> X-NVConfidentiality: public X-ClientProxiedBy: SJ0PR03CA0387.namprd03.prod.outlook.com (2603:10b6:a03:3a1::32) To BY5PR12MB4130.namprd12.prod.outlook.com (2603:10b6:a03:20b::16) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR12MB4130:EE_|BL3PR12MB6620:EE_ X-MS-Office365-Filtering-Correlation-Id: 12cfd5f2-2d39-4350-2f95-08dc7e90214d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|7416005|366007|376005; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 12cfd5f2-2d39-4350-2f95-08dc7e90214d X-MS-Exchange-CrossTenant-AuthSource: BY5PR12MB4130.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2024 21:01:07.9591 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: BT8LCEfG8ys21qA53zUQHDVEZyImzmWZ1EYKD6WS3OBFEOudAxs2N7rCfTldFfkLrUHbIma0DfKJbULQ9orGTg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6620 First of all, in order to build with clang at all, one must first apply Valentin Obst's build fix for LLVM [1]. Once that is done, then when building with clang, via: make LLVM=1 -C tools/testing/selftests ...the build fails because clang's inline asm doesn't support all of the features that are used in the asm() snippet in sysret_rip.c. Fix this by moving the asm code into the clang_helpers_64.S file, where it can be built with the assembler's full set of features. [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/ Signed-off-by: John Hubbard --- tools/testing/selftests/x86/Makefile | 1 + .../testing/selftests/x86/clang_helpers_64.S | 16 +++++++++++++++ tools/testing/selftests/x86/sysret_rip.c | 20 ++++++------------- 3 files changed, 23 insertions(+), 14 deletions(-) diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index 99bc2ef84f5a..d0bb32bd5538 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -115,6 +115,7 @@ $(eval $(call extra-files,ptrace_syscall_32,raw_syscall_helper_32.S)) $(eval $(call extra-files,test_syscall_vdso_32,thunks_32.S)) $(eval $(call extra-files,fsgsbase_restore_64,clang_helpers_64.S)) $(eval $(call extra-files,fsgsbase_restore_32,clang_helpers_32.S)) +$(eval $(call extra-files,sysret_rip_64,clang_helpers_64.S)) # check_initial_reg_state is special: it needs a custom entry, and it # needs to be static so that its interpreter doesn't destroy its initial diff --git a/tools/testing/selftests/x86/clang_helpers_64.S b/tools/testing/selftests/x86/clang_helpers_64.S index 0d81c71cad97..185a69dbf39c 100644 --- a/tools/testing/selftests/x86/clang_helpers_64.S +++ b/tools/testing/selftests/x86/clang_helpers_64.S @@ -9,4 +9,20 @@ dereference_seg_base: mov %gs:(0), %rax ret +.global test_page +.global test_syscall_insn + +.pushsection ".text", "ax" +.balign 4096 +test_page: .globl test_page + .fill 4094,1,0xcc + +test_syscall_insn: + syscall + +.ifne . - test_page - 4096 + .error "test page is not one page long" +.endif +.popsection + .section .note.GNU-stack,"",%progbits diff --git a/tools/testing/selftests/x86/sysret_rip.c b/tools/testing/selftests/x86/sysret_rip.c index 84d74be1d902..b30de9aaa6d4 100644 --- a/tools/testing/selftests/x86/sysret_rip.c +++ b/tools/testing/selftests/x86/sysret_rip.c @@ -22,21 +22,13 @@ #include #include - -asm ( - ".pushsection \".text\", \"ax\"\n\t" - ".balign 4096\n\t" - "test_page: .globl test_page\n\t" - ".fill 4094,1,0xcc\n\t" - "test_syscall_insn:\n\t" - "syscall\n\t" - ".ifne . - test_page - 4096\n\t" - ".error \"test page is not one page long\"\n\t" - ".endif\n\t" - ".popsection" - ); - +/* + * These items are in clang_helpers_64.S, in order to avoid clang inline asm + * limitations: + */ +void test_syscall_ins(void); extern const char test_page[]; + static void const *current_test_page_addr = test_page; static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),