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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __LINUX_COMPILER_TYPES_H3#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."4#endif5 6/* Compiler specific definitions for Clang compiler */7 8/*9 * Clang prior to 17 is being silly and considers many __cleanup() variables10 * as unused (because they are, their sole purpose is to go out of scope).11 *12 * https://github.com/llvm/llvm-project/commit/877210faa447f4cc7db87812f8ed80e398fedd6113 */14#undef __cleanup15#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 519 20/*21 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is22 * 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#else32#define __no_sanitize_address33#endif34 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#else41#define __no_sanitize_thread42#endif43 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#else55#define __no_sanitize_undefined56#endif57 58#if __has_feature(memory_sanitizer)59#define __SANITIZE_MEMORY__60/*61 * Unlike other sanitizers, KMSAN still inserts code into functions marked with62 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation63 * 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_instrumentation67 68/*69 * The __no_kmsan_checks attribute ensures that a function does not produce70 * 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#else77#define __no_sanitize_memory78#define __no_kmsan_checks79#endif80 81/*82 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together83 * with no_sanitize("coverage"). Prior versions of Clang support coverage84 * 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#else89#define __no_sanitize_coverage90#endif91 92#if __has_feature(shadow_call_stack)93# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))94#endif95 96#if __has_feature(kcfi)97/* Disable CFI checking inside a function. */98#define __nocfi __attribute__((__no_sanitize__("kcfi")))99#endif100 101/*102 * Turn individual warnings and errors on and off locally, depending103 * 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 ignored110#define __diag_clang_warn warning111#define __diag_clang_error error112 113#define __diag_str1(s) #s114#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)121 122/*123 * clang has horrible behavior with "g" or "rm" constraints for asm124 * inputs, turning them into something worse than "m". Avoid using125 * constraints with multiple possible uses (but "ir" seems to be ok):126 *127 * https://github.com/llvm/llvm-project/issues/20571128 */129#define ASM_INPUT_G "ir"130#define ASM_INPUT_RM "r"131