| 1 |
|
| 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
|
| 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
|
| 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 | void bug_get_file_line(struct bug_entry *bug, const char **file,
|
| 40 | unsigned int *line);
|
| 41 |
|
| 42 | struct bug_entry *find_bug(unsigned long bugaddr);
|
| 43 |
|
| 44 | enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
|
| 45 | enum bug_trap_type report_bug_entry(struct bug_entry *bug, struct pt_regs *regs);
|
| 46 |
|
| 47 |
|
| 48 | int is_valid_bugaddr(unsigned long addr);
|
| 49 |
|
| 50 | void generic_bug_clear_once(void);
|
| 51 |
|
| 52 | #else
|
| 53 |
|
| 54 | static inline void *find_bug(unsigned long bugaddr)
|
| 55 | {
|
| 56 | return NULL;
|
| 57 | }
|
| 58 |
|
| 59 | static inline enum bug_trap_type report_bug(unsigned long bug_addr,
|
| 60 | struct pt_regs *regs)
|
| 61 | {
|
| 62 | return BUG_TRAP_TYPE_BUG;
|
| 63 | }
|
| 64 |
|
| 65 | struct bug_entry;
|
| 66 |
|
| 67 | static inline enum bug_trap_type
|
| 68 | report_bug_entry(struct bug_entry *bug, struct pt_regs *regs)
|
| 69 | {
|
| 70 | return BUG_TRAP_TYPE_BUG;
|
| 71 | }
|
| 72 |
|
| 73 | static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
|
| 74 | unsigned int *line)
|
| 75 | {
|
| 76 | *file = NULL;
|
| 77 | *line = 0;
|
| 78 | }
|
| 79 |
|
| 80 | static inline void generic_bug_clear_once(void) {}
|
| 81 |
|
| 82 | #endif
|
| 83 |
|
| 84 | #ifdef CONFIG_PRINTK
|
| 85 | void mem_dump_obj(void *object);
|
| 86 | #else
|
| 87 | static inline void mem_dump_obj(void *object) {}
|
| 88 | #endif
|
| 89 |
|
| 90 | |
| 91 | * Since detected data corruption should stop operation on the affected
|
| 92 | * structures. Return value must be checked and sanely acted on by caller.
|
| 93 |
|
| 94 | static inline __must_check bool check_data_corruption(bool v) { return v; }
|
| 95 | #define CHECK_DATA_CORRUPTION(condition, addr, fmt, ...) \
|
| 96 | check_data_corruption(({ \
|
| 97 | bool corruption = unlikely(condition); \
|
| 98 | if (corruption) { \
|
| 99 | if (addr) \
|
| 100 | mem_dump_obj(addr); \
|
| 101 | if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
|
| 102 | pr_err(fmt, ##__VA_ARGS__); \
|
| 103 | BUG(); \
|
| 104 | } else \
|
| 105 | WARN(1, fmt, ##__VA_ARGS__); \
|
| 106 | } \
|
| 107 | corruption; \
|
| 108 | }))
|
| 109 |
|
| 110 | #endif
|