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7664c5a1 JF |
1 | #ifndef _LINUX_BUG_H |
2 | #define _LINUX_BUG_H | |
3 | ||
7664c5a1 JF |
4 | #include <asm/bug.h> |
5 | ||
6 | enum bug_trap_type { | |
7 | BUG_TRAP_TYPE_NONE = 0, | |
8 | BUG_TRAP_TYPE_WARN = 1, | |
9 | BUG_TRAP_TYPE_BUG = 2, | |
10 | }; | |
11 | ||
608e2619 HC |
12 | struct pt_regs; |
13 | ||
35edd910 PG |
14 | #ifdef __CHECKER__ |
15 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) | |
16 | #define BUILD_BUG_ON_ZERO(e) (0) | |
17 | #define BUILD_BUG_ON_NULL(e) ((void*)0) | |
18 | #define BUILD_BUG_ON(condition) | |
19 | #define BUILD_BUG() (0) | |
20 | #else /* __CHECKER__ */ | |
21 | ||
22 | /* Force a compilation error if a constant expression is not a power of 2 */ | |
23 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ | |
24 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) | |
25 | ||
26 | /* Force a compilation error if condition is true, but also produce a | |
27 | result (of value 0 and type size_t), so the expression can be used | |
28 | e.g. in a structure initializer (or where-ever else comma expressions | |
29 | aren't permitted). */ | |
30 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) | |
31 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) | |
32 | ||
33 | /** | |
34 | * BUILD_BUG_ON - break compile if a condition is true. | |
35 | * @condition: the condition which the compiler should know is false. | |
36 | * | |
37 | * If you have some code which relies on certain constants being equal, or | |
38 | * other compile-time-evaluated condition, you should use BUILD_BUG_ON to | |
39 | * detect if someone changes it. | |
40 | * | |
41 | * The implementation uses gcc's reluctance to create a negative array, but | |
42 | * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments | |
43 | * to inline functions). So as a fallback we use the optimizer; if it can't | |
44 | * prove the condition is false, it will cause a link error on the undefined | |
45 | * "__build_bug_on_failed". This error message can be harder to track down | |
46 | * though, hence the two different methods. | |
47 | */ | |
48 | #ifndef __OPTIMIZE__ | |
49 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
50 | #else | |
51 | extern int __build_bug_on_failed; | |
52 | #define BUILD_BUG_ON(condition) \ | |
53 | do { \ | |
54 | ((void)sizeof(char[1 - 2*!!(condition)])); \ | |
55 | if (condition) __build_bug_on_failed = 1; \ | |
56 | } while(0) | |
57 | #endif | |
58 | ||
59 | /** | |
60 | * BUILD_BUG - break compile if used. | |
61 | * | |
62 | * If you have some code that you expect the compiler to eliminate at | |
63 | * build time, you should use BUILD_BUG to detect if it is | |
64 | * unexpectedly used. | |
65 | */ | |
66 | #define BUILD_BUG() \ | |
67 | do { \ | |
68 | extern void __build_bug_failed(void) \ | |
69 | __linktime_error("BUILD_BUG failed"); \ | |
70 | __build_bug_failed(); \ | |
71 | } while (0) | |
72 | ||
73 | #endif /* __CHECKER__ */ | |
74 | ||
7664c5a1 JF |
75 | #ifdef CONFIG_GENERIC_BUG |
76 | #include <asm-generic/bug.h> | |
77 | ||
78 | static inline int is_warning_bug(const struct bug_entry *bug) | |
79 | { | |
80 | return bug->flags & BUGFLAG_WARNING; | |
81 | } | |
82 | ||
83 | const struct bug_entry *find_bug(unsigned long bugaddr); | |
84 | ||
608e2619 | 85 | enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs); |
7664c5a1 | 86 | |
7664c5a1 JF |
87 | /* These are defined by the architecture */ |
88 | int is_valid_bugaddr(unsigned long addr); | |
89 | ||
90 | #else /* !CONFIG_GENERIC_BUG */ | |
91 | ||
608e2619 HC |
92 | static inline enum bug_trap_type report_bug(unsigned long bug_addr, |
93 | struct pt_regs *regs) | |
7664c5a1 JF |
94 | { |
95 | return BUG_TRAP_TYPE_BUG; | |
96 | } | |
7664c5a1 JF |
97 | |
98 | #endif /* CONFIG_GENERIC_BUG */ | |
99 | #endif /* _LINUX_BUG_H */ |