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1 | #ifndef _LINUX_BUG_H |
2 | #define _LINUX_BUG_H |
3 | |
4 | #include <asm/bug.h> |
5 | #include <linux/compiler.h> |
6 | |
7 | enum bug_trap_type { |
8 | BUG_TRAP_TYPE_NONE = 0, |
9 | BUG_TRAP_TYPE_WARN = 1, |
10 | BUG_TRAP_TYPE_BUG = 2, |
11 | }; |
12 | |
13 | struct pt_regs; |
14 | |
15 | #ifdef __CHECKER__ |
16 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) |
17 | #define BUILD_BUG_ON_ZERO(e) (0) |
18 | #define BUILD_BUG_ON_NULL(e) ((void*)0) |
19 | #define BUILD_BUG_ON_INVALID(e) (0) |
20 | #define BUILD_BUG_ON_MSG(cond, msg) (0) |
21 | #define BUILD_BUG_ON(condition) (0) |
22 | #define BUILD_BUG() (0) |
23 | #else /* __CHECKER__ */ |
24 | |
25 | /* Force a compilation error if a constant expression is not a power of 2 */ |
26 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
27 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
28 | |
29 | /* Force a compilation error if condition is true, but also produce a |
30 | result (of value 0 and type size_t), so the expression can be used |
31 | e.g. in a structure initializer (or where-ever else comma expressions |
32 | aren't permitted). */ |
33 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
34 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
35 | |
36 | /* |
37 | * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the |
38 | * expression but avoids the generation of any code, even if that expression |
39 | * has side-effects. |
40 | */ |
41 | #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) |
42 | |
43 | /** |
44 | * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied |
45 | * error message. |
46 | * @condition: the condition which the compiler should know is false. |
47 | * |
48 | * See BUILD_BUG_ON for description. |
49 | */ |
50 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) |
51 | |
52 | /** |
53 | * BUILD_BUG_ON - break compile if a condition is true. |
54 | * @condition: the condition which the compiler should know is false. |
55 | * |
56 | * If you have some code which relies on certain constants being equal, or |
57 | * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to |
58 | * detect if someone changes it. |
59 | * |
60 | * The implementation uses gcc's reluctance to create a negative array, but gcc |
61 | * (as of 4.4) only emits that error for obvious cases (e.g. not arguments to |
62 | * inline functions). Luckily, in 4.3 they added the "error" function |
63 | * attribute just for this type of case. Thus, we use a negative sized array |
64 | * (should always create an error on gcc versions older than 4.4) and then call |
65 | * an undefined function with the error attribute (should always create an |
66 | * error on gcc 4.3 and later). If for some reason, neither creates a |
67 | * compile-time error, we'll still have a link-time error, which is harder to |
68 | * track down. |
69 | */ |
70 | #ifndef __OPTIMIZE__ |
71 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
72 | #else |
73 | #define BUILD_BUG_ON(condition) \ |
74 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) |
75 | #endif |
76 | |
77 | /** |
78 | * BUILD_BUG - break compile if used. |
79 | * |
80 | * If you have some code that you expect the compiler to eliminate at |
81 | * build time, you should use BUILD_BUG to detect if it is |
82 | * unexpectedly used. |
83 | */ |
84 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") |
85 | |
86 | #endif /* __CHECKER__ */ |
87 | |
88 | #ifdef CONFIG_GENERIC_BUG |
89 | #include <asm-generic/bug.h> |
90 | |
91 | static inline int is_warning_bug(const struct bug_entry *bug) |
92 | { |
93 | return bug->flags & BUGFLAG_WARNING; |
94 | } |
95 | |
96 | const struct bug_entry *find_bug(unsigned long bugaddr); |
97 | |
98 | enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs); |
99 | |
100 | /* These are defined by the architecture */ |
101 | int is_valid_bugaddr(unsigned long addr); |
102 | |
103 | #else /* !CONFIG_GENERIC_BUG */ |
104 | |
105 | static inline enum bug_trap_type report_bug(unsigned long bug_addr, |
106 | struct pt_regs *regs) |
107 | { |
108 | return BUG_TRAP_TYPE_BUG; |
109 | } |
110 | |
111 | #endif /* CONFIG_GENERIC_BUG */ |
112 | #endif /* _LINUX_BUG_H */ |
113 |
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