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 /* same as gcc, this was present in clang-2.6 so we can assume it works 9 * with any version that can compile the kernel 10 */ 11 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) 12 13 /* all clang versions usable with the kernel support KASAN ABI version 5 */ 14 #define KASAN_ABI_VERSION 5 15 16 /* 17 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is 18 * enabled. Therefore it is not required to additionally check defined(CONFIG_*) 19 * to avoid adding redundant attributes in other configurations. 20 */ 21 22 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 23 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */ 24 #define __SANITIZE_ADDRESS__ 25 #define __no_sanitize_address \ 26 __attribute__((no_sanitize("address", "hwaddress"))) 27 #else 28 #define __no_sanitize_address 29 #endif 30 31 #if __has_feature(thread_sanitizer) 32 /* emulate gcc's __SANITIZE_THREAD__ flag */ 33 #define __SANITIZE_THREAD__ 34 #define __no_sanitize_thread \ 35 __attribute__((no_sanitize("thread"))) 36 #else 37 #define __no_sanitize_thread 38 #endif 39 40 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 41 #define __HAVE_BUILTIN_BSWAP32__ 42 #define __HAVE_BUILTIN_BSWAP64__ 43 #define __HAVE_BUILTIN_BSWAP16__ 44 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 45 46 #if __has_feature(undefined_behavior_sanitizer) 47 /* GCC does not have __SANITIZE_UNDEFINED__ */ 48 #define __no_sanitize_undefined \ 49 __attribute__((no_sanitize("undefined"))) 50 #else 51 #define __no_sanitize_undefined 52 #endif 53 54 #if __has_feature(memory_sanitizer) 55 #define __SANITIZE_MEMORY__ 56 /* 57 * Unlike other sanitizers, KMSAN still inserts code into functions marked with 58 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation 59 * provides the behavior consistent with other __no_sanitize_ attributes, 60 * guaranteeing that __no_sanitize_memory functions remain uninstrumented. 61 */ 62 #define __no_sanitize_memory __disable_sanitizer_instrumentation 63 64 /* 65 * The __no_kmsan_checks attribute ensures that a function does not produce 66 * false positive reports by: 67 * - initializing all local variables and memory stores in this function; 68 * - skipping all shadow checks; 69 * - passing initialized arguments to this function's callees. 70 */ 71 #define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory"))) 72 #else 73 #define __no_sanitize_memory 74 #define __no_kmsan_checks 75 #endif 76 77 /* 78 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together 79 * with no_sanitize("coverage"). Prior versions of Clang support coverage 80 * instrumentation, but cannot be queried for support by the preprocessor. 81 */ 82 #if __has_feature(coverage_sanitizer) 83 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage"))) 84 #else 85 #define __no_sanitize_coverage 86 #endif 87 88 #if __has_feature(shadow_call_stack) 89 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 90 #endif 91 92 #if __has_feature(kcfi) 93 /* Disable CFI checking inside a function. */ 94 #define __nocfi __attribute__((__no_sanitize__("kcfi"))) 95 #endif 96 97 /* 98 * Turn individual warnings and errors on and off locally, depending 99 * on version. 100 */ 101 #define __diag_clang(version, severity, s) \ 102 __diag_clang_ ## version(__diag_clang_ ## severity s) 103 104 /* Severity used in pragma directives */ 105 #define __diag_clang_ignore ignored 106 #define __diag_clang_warn warning 107 #define __diag_clang_error error 108 109 #define __diag_str1(s) #s 110 #define __diag_str(s) __diag_str1(s) 111 #define __diag(s) _Pragma(__diag_str(clang diagnostic s)) 112 113 #if CONFIG_CLANG_VERSION >= 110000 114 #define __diag_clang_11(s) __diag(s) 115 #else 116 #define __diag_clang_11(s) 117 #endif 118 119 #define __diag_ignore_all(option, comment) \ 120 __diag_clang(11, ignore, option) 121