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 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 17 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */ 18 #define __SANITIZE_ADDRESS__ 19 #define __no_sanitize_address \ 20 __attribute__((no_sanitize("address", "hwaddress"))) 21 #else 22 #define __no_sanitize_address 23 #endif 24 25 #if __has_feature(thread_sanitizer) 26 /* emulate gcc's __SANITIZE_THREAD__ flag */ 27 #define __SANITIZE_THREAD__ 28 #define __no_sanitize_thread \ 29 __attribute__((no_sanitize("thread"))) 30 #else 31 #define __no_sanitize_thread 32 #endif 33 34 #if __has_feature(undefined_behavior_sanitizer) 35 /* GCC does not have __SANITIZE_UNDEFINED__ */ 36 #define __no_sanitize_undefined \ 37 __attribute__((no_sanitize("undefined"))) 38 #else 39 #define __no_sanitize_undefined 40 #endif 41 42 /* 43 * Not all versions of clang implement the the type-generic versions 44 * of the builtin overflow checkers. Fortunately, clang implements 45 * __has_builtin allowing us to avoid awkward version 46 * checks. Unfortunately, we don't know which version of gcc clang 47 * pretends to be, so the macro may or may not be defined. 48 */ 49 #if __has_builtin(__builtin_mul_overflow) && \ 50 __has_builtin(__builtin_add_overflow) && \ 51 __has_builtin(__builtin_sub_overflow) 52 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 53 #endif 54 55 /* The following are for compatibility with GCC, from compiler-gcc.h, 56 * and may be redefined here because they should not be shared with other 57 * compilers, like ICC. 58 */ 59 #define barrier() __asm__ __volatile__("" : : : "memory") 60 61 #if __has_feature(shadow_call_stack) 62 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 63 #endif 64