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 | struct bug_entry *find_bug(unsigned long bugaddr); |
40 | |
41 | enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs); |
42 | |
43 | /* These are defined by the architecture */ |
44 | int is_valid_bugaddr(unsigned long addr); |
45 | |
46 | void generic_bug_clear_once(void); |
47 | |
48 | #else /* !CONFIG_GENERIC_BUG */ |
49 | |
50 | static inline enum bug_trap_type report_bug(unsigned long bug_addr, |
51 | struct pt_regs *regs) |
52 | { |
53 | return BUG_TRAP_TYPE_BUG; |
54 | } |
55 | |
56 | |
57 | static inline void generic_bug_clear_once(void) {} |
58 | |
59 | #endif /* CONFIG_GENERIC_BUG */ |
60 | |
61 | /* |
62 | * Since detected data corruption should stop operation on the affected |
63 | * structures. Return value must be checked and sanely acted on by caller. |
64 | */ |
65 | static inline __must_check bool check_data_corruption(bool v) { return v; } |
66 | #define CHECK_DATA_CORRUPTION(condition, fmt, ...) \ |
67 | check_data_corruption(({ \ |
68 | bool corruption = unlikely(condition); \ |
69 | if (corruption) { \ |
70 | if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \ |
71 | pr_err(fmt, ##__VA_ARGS__); \ |
72 | BUG(); \ |
73 | } else \ |
74 | WARN(1, fmt, ##__VA_ARGS__); \ |
75 | } \ |
76 | corruption; \ |
77 | })) |
78 | |
79 | #endif /* _LINUX_BUG_H */ |
80 | |