1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_COMPILER_TYPES_H 3 #error "Please do not 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 /* Only Clang needs to disable the coverage sanitizer for kstack_erase. */ 93 #define __no_kstack_erase __no_sanitize_coverage 94 95 #if __has_feature(shadow_call_stack) 96 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 97 #endif 98 99 #if __has_feature(kcfi) 100 /* Disable CFI checking inside a function. */ 101 #define __nocfi __attribute__((__no_sanitize__("kcfi"))) 102 #endif 103 104 /* 105 * Turn individual warnings and errors on and off locally, depending 106 * on version. 107 */ 108 #define __diag_clang(version, severity, s) \ 109 __diag_clang_ ## version(__diag_clang_ ## severity s) 110 111 /* Severity used in pragma directives */ 112 #define __diag_clang_ignore ignored 113 #define __diag_clang_warn warning 114 #define __diag_clang_error error 115 116 #define __diag_str1(s) #s 117 #define __diag_str(s) __diag_str1(s) 118 #define __diag(s) _Pragma(__diag_str(clang diagnostic s)) 119 120 #define __diag_clang_13(s) __diag(s) 121 122 #define __diag_ignore_all(option, comment) \ 123 __diag_clang(13, ignore, option) 124 125 /* 126 * clang has horrible behavior with "g" or "rm" constraints for asm 127 * inputs, turning them into something worse than "m". Avoid using 128 * constraints with multiple possible uses (but "ir" seems to be ok): 129 * 130 * https://github.com/llvm/llvm-project/issues/20571 131 */ 132 #define ASM_INPUT_G "ir" 133 #define ASM_INPUT_RM "r" 134 135 /* 136 * Declare compiler support for __typeof_unqual__() operator. 137 * 138 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot 139 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL. 140 */ 141 #define CC_HAS_TYPEOF_UNQUAL (__clang_major__ >= 19) 142