1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __LINUX_COMPILER_TYPES_H 3#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." 4#endif 5 6/* Compiler specific definitions for Clang compiler */ 7 8/* 9 * Clang prior to 17 is being silly and considers many __cleanup() variables 10 * as unused (because they are, their sole purpose is to go out of scope). 11 * 12 * https://github.com/llvm/llvm-project/commit/877210faa447f4cc7db87812f8ed80e398fedd61 13 */ 14#undef __cleanup 15#define __cleanup(func) __maybe_unused __attribute__((__cleanup__(func))) 16 17/* all clang versions usable with the kernel support KASAN ABI version 5 */ 18#define KASAN_ABI_VERSION 5 19 20/* 21 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is 22 * enabled. Therefore it is not required to additionally check defined(CONFIG_*) 23 * to avoid adding redundant attributes in other configurations. 24 */ 25 26#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 27/* Emulate GCC's __SANITIZE_ADDRESS__ flag */ 28#define __SANITIZE_ADDRESS__ 29#define __no_sanitize_address \ 30 __attribute__((no_sanitize("address", "hwaddress"))) 31#else 32#define __no_sanitize_address 33#endif 34 35#if __has_feature(thread_sanitizer) 36/* emulate gcc's __SANITIZE_THREAD__ flag */ 37#define __SANITIZE_THREAD__ 38#define __no_sanitize_thread \ 39 __attribute__((no_sanitize("thread"))) 40#else 41#define __no_sanitize_thread 42#endif 43 44#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 45#define __HAVE_BUILTIN_BSWAP32__ 46#define __HAVE_BUILTIN_BSWAP64__ 47#define __HAVE_BUILTIN_BSWAP16__ 48#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 49 50#if __has_feature(undefined_behavior_sanitizer) 51/* GCC does not have __SANITIZE_UNDEFINED__ */ 52#define __no_sanitize_undefined \ 53 __attribute__((no_sanitize("undefined"))) 54#else 55#define __no_sanitize_undefined 56#endif 57 58#if __has_feature(memory_sanitizer) 59#define __SANITIZE_MEMORY__ 60/* 61 * Unlike other sanitizers, KMSAN still inserts code into functions marked with 62 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation 63 * provides the behavior consistent with other __no_sanitize_ attributes, 64 * guaranteeing that __no_sanitize_memory functions remain uninstrumented. 65 */ 66#define __no_sanitize_memory __disable_sanitizer_instrumentation 67 68/* 69 * The __no_kmsan_checks attribute ensures that a function does not produce 70 * false positive reports by: 71 * - initializing all local variables and memory stores in this function; 72 * - skipping all shadow checks; 73 * - passing initialized arguments to this function's callees. 74 */ 75#define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory"))) 76#else 77#define __no_sanitize_memory 78#define __no_kmsan_checks 79#endif 80 81/* 82 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together 83 * with no_sanitize("coverage"). Prior versions of Clang support coverage 84 * instrumentation, but cannot be queried for support by the preprocessor. 85 */ 86#if __has_feature(coverage_sanitizer) 87#define __no_sanitize_coverage __attribute__((no_sanitize("coverage"))) 88#else 89#define __no_sanitize_coverage 90#endif 91 92#if __has_feature(shadow_call_stack) 93# define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 94#endif 95 96#if __has_feature(kcfi) 97/* Disable CFI checking inside a function. */ 98#define __nocfi __attribute__((__no_sanitize__("kcfi"))) 99#endif 100 101/* 102 * Turn individual warnings and errors on and off locally, depending 103 * on version. 104 */ 105#define __diag_clang(version, severity, s) \ 106 __diag_clang_ ## version(__diag_clang_ ## severity s) 107 108/* Severity used in pragma directives */ 109#define __diag_clang_ignore ignored 110#define __diag_clang_warn warning 111#define __diag_clang_error error 112 113#define __diag_str1(s) #s 114#define __diag_str(s) __diag_str1(s) 115#define __diag(s) _Pragma(__diag_str(clang diagnostic s)) 116 117#define __diag_clang_13(s) __diag(s) 118 119#define __diag_ignore_all(option, comment) \ 120 __diag_clang(13, ignore, option) 121