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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 | 14 | #ifdef __CHECKER__ |
ca623c91 | 15 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) |
35edd910 PG |
16 | #define BUILD_BUG_ON_ZERO(e) (0) |
17 | #define BUILD_BUG_ON_NULL(e) ((void*)0) | |
c5782e9f | 18 | #define BUILD_BUG_ON_INVALID(e) (0) |
ca623c91 | 19 | #define BUILD_BUG_ON(condition) (0) |
35edd910 PG |
20 | #define BUILD_BUG() (0) |
21 | #else /* __CHECKER__ */ | |
22 | ||
23 | /* Force a compilation error if a constant expression is not a power of 2 */ | |
24 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ | |
25 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) | |
26 | ||
27 | /* Force a compilation error if condition is true, but also produce a | |
28 | result (of value 0 and type size_t), so the expression can be used | |
29 | e.g. in a structure initializer (or where-ever else comma expressions | |
30 | aren't permitted). */ | |
31 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) | |
32 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) | |
33 | ||
baf05aa9 KK |
34 | /* |
35 | * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the | |
36 | * expression but avoids the generation of any code, even if that expression | |
37 | * has side-effects. | |
38 | */ | |
39 | #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) | |
40 | ||
35edd910 PG |
41 | /** |
42 | * BUILD_BUG_ON - break compile if a condition is true. | |
43 | * @condition: the condition which the compiler should know is false. | |
44 | * | |
45 | * If you have some code which relies on certain constants being equal, or | |
46 | * other compile-time-evaluated condition, you should use BUILD_BUG_ON to | |
47 | * detect if someone changes it. | |
48 | * | |
49 | * The implementation uses gcc's reluctance to create a negative array, but | |
50 | * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments | |
51 | * to inline functions). So as a fallback we use the optimizer; if it can't | |
52 | * prove the condition is false, it will cause a link error on the undefined | |
53 | * "__build_bug_on_failed". This error message can be harder to track down | |
54 | * though, hence the two different methods. | |
55 | */ | |
56 | #ifndef __OPTIMIZE__ | |
57 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
58 | #else | |
59 | extern int __build_bug_on_failed; | |
60 | #define BUILD_BUG_ON(condition) \ | |
61 | do { \ | |
1d6a0d19 DS |
62 | bool __cond = !!(condition); \ |
63 | ((void)sizeof(char[1 - 2 * __cond])); \ | |
64 | if (__cond) __build_bug_on_failed = 1; \ | |
65 | } while (0) | |
35edd910 PG |
66 | #endif |
67 | ||
68 | /** | |
69 | * BUILD_BUG - break compile if used. | |
70 | * | |
71 | * If you have some code that you expect the compiler to eliminate at | |
72 | * build time, you should use BUILD_BUG to detect if it is | |
73 | * unexpectedly used. | |
74 | */ | |
75 | #define BUILD_BUG() \ | |
76 | do { \ | |
77 | extern void __build_bug_failed(void) \ | |
6ae8d048 | 78 | __compiletime_error("BUILD_BUG failed");\ |
35edd910 PG |
79 | __build_bug_failed(); \ |
80 | } while (0) | |
81 | ||
82 | #endif /* __CHECKER__ */ | |
83 | ||
7664c5a1 JF |
84 | #ifdef CONFIG_GENERIC_BUG |
85 | #include <asm-generic/bug.h> | |
86 | ||
87 | static inline int is_warning_bug(const struct bug_entry *bug) | |
88 | { | |
89 | return bug->flags & BUGFLAG_WARNING; | |
90 | } | |
91 | ||
92 | const struct bug_entry *find_bug(unsigned long bugaddr); | |
93 | ||
608e2619 | 94 | enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs); |
7664c5a1 | 95 | |
7664c5a1 JF |
96 | /* These are defined by the architecture */ |
97 | int is_valid_bugaddr(unsigned long addr); | |
98 | ||
99 | #else /* !CONFIG_GENERIC_BUG */ | |
100 | ||
608e2619 HC |
101 | static inline enum bug_trap_type report_bug(unsigned long bug_addr, |
102 | struct pt_regs *regs) | |
7664c5a1 JF |
103 | { |
104 | return BUG_TRAP_TYPE_BUG; | |
105 | } | |
7664c5a1 JF |
106 | |
107 | #endif /* CONFIG_GENERIC_BUG */ | |
108 | #endif /* _LINUX_BUG_H */ |