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 #define CLANG_VERSION (__clang_major__ * 10000 \ 7 + __clang_minor__ * 100 \ 8 + __clang_patchlevel__) 9 10 #if CLANG_VERSION < 100001 11 #ifndef __BPF_TRACING__ 12 # error Sorry, your version of Clang is too old - please use 10.0.1 or newer. 13 #endif 14 #endif 15 16 /* Compiler specific definitions for Clang compiler */ 17 18 /* same as gcc, this was present in clang-2.6 so we can assume it works 19 * with any version that can compile the kernel 20 */ 21 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) 22 23 /* all clang versions usable with the kernel support KASAN ABI version 5 */ 24 #define KASAN_ABI_VERSION 5 25 26 /* 27 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is 28 * enabled. Therefore it is not required to additionally check defined(CONFIG_*) 29 * to avoid adding redundant attributes in other configurations. 30 */ 31 32 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 33 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */ 34 #define __SANITIZE_ADDRESS__ 35 #define __no_sanitize_address \ 36 __attribute__((no_sanitize("address", "hwaddress"))) 37 #else 38 #define __no_sanitize_address 39 #endif 40 41 #if __has_feature(thread_sanitizer) 42 /* emulate gcc's __SANITIZE_THREAD__ flag */ 43 #define __SANITIZE_THREAD__ 44 #define __no_sanitize_thread \ 45 __attribute__((no_sanitize("thread"))) 46 #else 47 #define __no_sanitize_thread 48 #endif 49 50 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 51 #define __HAVE_BUILTIN_BSWAP32__ 52 #define __HAVE_BUILTIN_BSWAP64__ 53 #define __HAVE_BUILTIN_BSWAP16__ 54 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 55 56 #if __has_feature(undefined_behavior_sanitizer) 57 /* GCC does not have __SANITIZE_UNDEFINED__ */ 58 #define __no_sanitize_undefined \ 59 __attribute__((no_sanitize("undefined"))) 60 #else 61 #define __no_sanitize_undefined 62 #endif 63 64 /* 65 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together 66 * with no_sanitize("coverage"). Prior versions of Clang support coverage 67 * instrumentation, but cannot be queried for support by the preprocessor. 68 */ 69 #if __has_feature(coverage_sanitizer) 70 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage"))) 71 #else 72 #define __no_sanitize_coverage 73 #endif 74 75 /* 76 * Not all versions of clang implement the type-generic versions 77 * of the builtin overflow checkers. Fortunately, clang implements 78 * __has_builtin allowing us to avoid awkward version 79 * checks. Unfortunately, we don't know which version of gcc clang 80 * pretends to be, so the macro may or may not be defined. 81 */ 82 #if __has_builtin(__builtin_mul_overflow) && \ 83 __has_builtin(__builtin_add_overflow) && \ 84 __has_builtin(__builtin_sub_overflow) 85 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 86 #endif 87 88 #if __has_feature(shadow_call_stack) 89 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 90 #endif 91 92 #define __nocfi __attribute__((__no_sanitize__("cfi"))) 93 #define __cficanonical __attribute__((__cfi_canonical_jump_table__)) 94