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://reviews.llvm.org/D152180 13 */ 14 #undef __cleanup 15 #define __cleanup(func) __maybe_unused __attribute__((__cleanup__(func))) 16 17 /* same as gcc, this was present in clang-2.6 so we can assume it works 18 * with any version that can compile the kernel 19 */ 20 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) 21 22 /* all clang versions usable with the kernel support KASAN ABI version 5 */ 23 #define KASAN_ABI_VERSION 5 24 25 /* 26 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is 27 * enabled. Therefore it is not required to additionally check defined(CONFIG_*) 28 * to avoid adding redundant attributes in other configurations. 29 */ 30 31 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 32 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */ 33 #define __SANITIZE_ADDRESS__ 34 #define __no_sanitize_address \ 35 __attribute__((no_sanitize("address", "hwaddress"))) 36 #else 37 #define __no_sanitize_address 38 #endif 39 40 #if __has_feature(thread_sanitizer) 41 /* emulate gcc's __SANITIZE_THREAD__ flag */ 42 #define __SANITIZE_THREAD__ 43 #define __no_sanitize_thread \ 44 __attribute__((no_sanitize("thread"))) 45 #else 46 #define __no_sanitize_thread 47 #endif 48 49 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 50 #define __HAVE_BUILTIN_BSWAP32__ 51 #define __HAVE_BUILTIN_BSWAP64__ 52 #define __HAVE_BUILTIN_BSWAP16__ 53 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 54 55 #if __has_feature(undefined_behavior_sanitizer) 56 /* GCC does not have __SANITIZE_UNDEFINED__ */ 57 #define __no_sanitize_undefined \ 58 __attribute__((no_sanitize("undefined"))) 59 #else 60 #define __no_sanitize_undefined 61 #endif 62 63 #if __has_feature(memory_sanitizer) 64 #define __SANITIZE_MEMORY__ 65 /* 66 * Unlike other sanitizers, KMSAN still inserts code into functions marked with 67 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation 68 * provides the behavior consistent with other __no_sanitize_ attributes, 69 * guaranteeing that __no_sanitize_memory functions remain uninstrumented. 70 */ 71 #define __no_sanitize_memory __disable_sanitizer_instrumentation 72 73 /* 74 * The __no_kmsan_checks attribute ensures that a function does not produce 75 * false positive reports by: 76 * - initializing all local variables and memory stores in this function; 77 * - skipping all shadow checks; 78 * - passing initialized arguments to this function's callees. 79 */ 80 #define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory"))) 81 #else 82 #define __no_sanitize_memory 83 #define __no_kmsan_checks 84 #endif 85 86 /* 87 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together 88 * with no_sanitize("coverage"). Prior versions of Clang support coverage 89 * instrumentation, but cannot be queried for support by the preprocessor. 90 */ 91 #if __has_feature(coverage_sanitizer) 92 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage"))) 93 #else 94 #define __no_sanitize_coverage 95 #endif 96 97 #if __has_feature(shadow_call_stack) 98 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 99 #endif 100 101 #if __has_feature(kcfi) 102 /* Disable CFI checking inside a function. */ 103 #define __nocfi __attribute__((__no_sanitize__("kcfi"))) 104 #endif 105 106 /* 107 * Turn individual warnings and errors on and off locally, depending 108 * on version. 109 */ 110 #define __diag_clang(version, severity, s) \ 111 __diag_clang_ ## version(__diag_clang_ ## severity s) 112 113 /* Severity used in pragma directives */ 114 #define __diag_clang_ignore ignored 115 #define __diag_clang_warn warning 116 #define __diag_clang_error error 117 118 #define __diag_str1(s) #s 119 #define __diag_str(s) __diag_str1(s) 120 #define __diag(s) _Pragma(__diag_str(clang diagnostic s)) 121 122 #if CONFIG_CLANG_VERSION >= 110000 123 #define __diag_clang_11(s) __diag(s) 124 #else 125 #define __diag_clang_11(s) 126 #endif 127 128 #define __diag_ignore_all(option, comment) \ 129 __diag_clang(11, ignore, option) 130