144 строки
4.5 KiB
C
144 строки
4.5 KiB
C
#ifndef _LINUX_BUG_H
|
|
#define _LINUX_BUG_H
|
|
|
|
#include <asm/bug.h>
|
|
#include <linux/compiler.h>
|
|
|
|
enum bug_trap_type {
|
|
BUG_TRAP_TYPE_NONE = 0,
|
|
BUG_TRAP_TYPE_WARN = 1,
|
|
BUG_TRAP_TYPE_BUG = 2,
|
|
};
|
|
|
|
struct pt_regs;
|
|
|
|
#ifdef __CHECKER__
|
|
#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
|
|
#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
|
|
#define BUILD_BUG_ON_ZERO(e) (0)
|
|
#define BUILD_BUG_ON_NULL(e) ((void*)0)
|
|
#define BUILD_BUG_ON_INVALID(e) (0)
|
|
#define BUILD_BUG_ON_MSG(cond, msg) (0)
|
|
#define BUILD_BUG_ON(condition) (0)
|
|
#define BUILD_BUG() (0)
|
|
#define MAYBE_BUILD_BUG_ON(cond) (0)
|
|
#else /* __CHECKER__ */
|
|
|
|
/* Force a compilation error if a constant expression is not a power of 2 */
|
|
#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \
|
|
BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
|
|
#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
|
|
BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
|
|
|
|
/* Force a compilation error if condition is true, but also produce a
|
|
result (of value 0 and type size_t), so the expression can be used
|
|
e.g. in a structure initializer (or where-ever else comma expressions
|
|
aren't permitted). */
|
|
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
|
|
#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
|
|
|
|
/*
|
|
* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
|
|
* expression but avoids the generation of any code, even if that expression
|
|
* has side-effects.
|
|
*/
|
|
#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
|
|
|
|
/**
|
|
* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
|
|
* error message.
|
|
* @condition: the condition which the compiler should know is false.
|
|
*
|
|
* See BUILD_BUG_ON for description.
|
|
*/
|
|
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
|
|
|
|
/**
|
|
* BUILD_BUG_ON - break compile if a condition is true.
|
|
* @condition: the condition which the compiler should know is false.
|
|
*
|
|
* If you have some code which relies on certain constants being equal, or
|
|
* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
|
|
* detect if someone changes it.
|
|
*
|
|
* The implementation uses gcc's reluctance to create a negative array, but gcc
|
|
* (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
|
|
* inline functions). Luckily, in 4.3 they added the "error" function
|
|
* attribute just for this type of case. Thus, we use a negative sized array
|
|
* (should always create an error on gcc versions older than 4.4) and then call
|
|
* an undefined function with the error attribute (should always create an
|
|
* error on gcc 4.3 and later). If for some reason, neither creates a
|
|
* compile-time error, we'll still have a link-time error, which is harder to
|
|
* track down.
|
|
*/
|
|
#ifndef __OPTIMIZE__
|
|
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
|
|
#else
|
|
#define BUILD_BUG_ON(condition) \
|
|
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
|
|
#endif
|
|
|
|
/**
|
|
* BUILD_BUG - break compile if used.
|
|
*
|
|
* If you have some code that you expect the compiler to eliminate at
|
|
* build time, you should use BUILD_BUG to detect if it is
|
|
* unexpectedly used.
|
|
*/
|
|
#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
|
|
|
|
#define MAYBE_BUILD_BUG_ON(cond) \
|
|
do { \
|
|
if (__builtin_constant_p((cond))) \
|
|
BUILD_BUG_ON(cond); \
|
|
else \
|
|
BUG_ON(cond); \
|
|
} while (0)
|
|
|
|
#endif /* __CHECKER__ */
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
#include <asm-generic/bug.h>
|
|
|
|
static inline int is_warning_bug(const struct bug_entry *bug)
|
|
{
|
|
return bug->flags & BUGFLAG_WARNING;
|
|
}
|
|
|
|
struct bug_entry *find_bug(unsigned long bugaddr);
|
|
|
|
enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
|
|
|
|
/* These are defined by the architecture */
|
|
int is_valid_bugaddr(unsigned long addr);
|
|
|
|
#else /* !CONFIG_GENERIC_BUG */
|
|
|
|
static inline enum bug_trap_type report_bug(unsigned long bug_addr,
|
|
struct pt_regs *regs)
|
|
{
|
|
return BUG_TRAP_TYPE_BUG;
|
|
}
|
|
|
|
#endif /* CONFIG_GENERIC_BUG */
|
|
|
|
/*
|
|
* Since detected data corruption should stop operation on the affected
|
|
* structures. Return value must be checked and sanely acted on by caller.
|
|
*/
|
|
static inline __must_check bool check_data_corruption(bool v) { return v; }
|
|
#define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
|
|
check_data_corruption(({ \
|
|
bool corruption = unlikely(condition); \
|
|
if (corruption) { \
|
|
if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
|
|
pr_err(fmt, ##__VA_ARGS__); \
|
|
BUG(); \
|
|
} else \
|
|
WARN(1, fmt, ##__VA_ARGS__); \
|
|
} \
|
|
corruption; \
|
|
}))
|
|
|
|
#endif /* _LINUX_BUG_H */
|