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 /*
55  * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
56  * with no_sanitize("coverage"). Prior versions of Clang support coverage
57  * instrumentation, but cannot be queried for support by the preprocessor.
58  */
59 #if __has_feature(coverage_sanitizer)
60 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
61 #else
62 #define __no_sanitize_coverage
63 #endif
64 
65 #if __has_feature(shadow_call_stack)
66 # define __noscs	__attribute__((__no_sanitize__("shadow-call-stack")))
67 #endif
68 
69 #define __nocfi		__attribute__((__no_sanitize__("cfi")))
70 #define __cficanonical	__attribute__((__cfi_canonical_jump_table__))
71