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