Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 50 | static inline void *find_bug(unsigned long bugaddr) |
| 51 | { |
| 52 | return NULL; |
| 53 | } |
| 54 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 55 | static inline enum bug_trap_type report_bug(unsigned long bug_addr, |
| 56 | struct pt_regs *regs) |
| 57 | { |
| 58 | return BUG_TRAP_TYPE_BUG; |
| 59 | } |
| 60 | |
| 61 | |
| 62 | static inline void generic_bug_clear_once(void) {} |
| 63 | |
| 64 | #endif /* CONFIG_GENERIC_BUG */ |
| 65 | |
| 66 | /* |
| 67 | * Since detected data corruption should stop operation on the affected |
| 68 | * structures. Return value must be checked and sanely acted on by caller. |
| 69 | */ |
| 70 | static inline __must_check bool check_data_corruption(bool v) { return v; } |
| 71 | #define CHECK_DATA_CORRUPTION(condition, fmt, ...) \ |
| 72 | check_data_corruption(({ \ |
| 73 | bool corruption = unlikely(condition); \ |
| 74 | if (corruption) { \ |
| 75 | if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \ |
| 76 | pr_err(fmt, ##__VA_ARGS__); \ |
| 77 | BUG(); \ |
| 78 | } else \ |
| 79 | WARN(1, fmt, ##__VA_ARGS__); \ |
| 80 | } \ |
| 81 | corruption; \ |
| 82 | })) |
| 83 | |
| 84 | #endif /* _LINUX_BUG_H */ |