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 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 /* These are defined by the architecture */ 48 int is_valid_bugaddr(unsigned long addr); 49 50 void generic_bug_clear_once(void); 51 52 #else /* !CONFIG_GENERIC_BUG */ 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 /* CONFIG_GENERIC_BUG */ 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 /* _LINUX_BUG_H */ 111