1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BUG_H
3 #define _LINUX_BUG_H
4
5 #include <asm/bug.h>
6 #include <linux/compiler.h>
7 #include <linux/build_bug.h>
8
9 enum bug_trap_type {
10 BUG_TRAP_TYPE_NONE = 0,
11 BUG_TRAP_TYPE_WARN = 1,
12 BUG_TRAP_TYPE_BUG = 2,
13 };
14
15 struct pt_regs;
16
17 #ifdef __CHECKER__
18 #define MAYBE_BUILD_BUG_ON(cond) (0)
19 #else /* __CHECKER__ */
20
21 #define MAYBE_BUILD_BUG_ON(cond) \
22 do { \
23 if (__builtin_constant_p((cond))) \
24 BUILD_BUG_ON(cond); \
25 else \
26 BUG_ON(cond); \
27 } while (0)
28
29 #endif /* __CHECKER__ */
30
31 #ifdef CONFIG_GENERIC_BUG
32 #include <asm-generic/bug.h>
33
34 static inline int is_warning_bug(const struct bug_entry *bug)
35 {
36 return bug->flags & BUGFLAG_WARNING;
37 }
38
39 void bug_get_file_line(struct bug_entry *bug, const char **file,
40 unsigned int *line);
41
42 struct bug_entry *find_bug(unsigned long bugaddr);
43
44 enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
45
46 /* These are defined by the architecture */
47 int is_valid_bugaddr(unsigned long addr);
48
49 void generic_bug_clear_once(void);
50
51 #else /* !CONFIG_GENERIC_BUG */
52
53 static inline void *find_bug(unsigned long bugaddr)
54 {
55 return NULL;
56 }
57
58 static inline enum bug_trap_type report_bug(unsigned long bug_addr,
59 struct pt_regs *regs)
60 {
61 return BUG_TRAP_TYPE_BUG;
62 }
63
64 struct bug_entry;
65 static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
66 unsigned int *line)
67 {
68 *file = NULL;
69 *line = 0;
70 }
71
72 static inline void generic_bug_clear_once(void) {}
73
74 #endif /* CONFIG_GENERIC_BUG */
75
76 /*
77 * Since detected data corruption should stop operation on the affected
78 * structures. Return value must be checked and sanely acted on by caller.
79 */
80 static inline __must_check bool check_data_corruption(bool v) { return v; }
81 #define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
82 check_data_corruption(({ \
83 bool corruption = unlikely(condition); \
84 if (corruption) { \
85 if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
86 pr_err(fmt, ##__VA_ARGS__); \
87 BUG(); \
88 } else \
89 WARN(1, fmt, ##__VA_ARGS__); \
90 } \
91 corruption; \
92 }))
93
94 #endif /* _LINUX_BUG_H */
95
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