/* SPDX-License-Identifier: GPL-2.0 */#ifndef __ASM_GENERIC_UACCESS_H#define __ASM_GENERIC_UACCESS_H /* * User space memory access functions, these should work * on any machine that has kernel and user data in the same * address space, e.g. all NOMMU machines. */#include <linux/string.h> #ifdef CONFIG_UACCESS_MEMCPYstatic inline __must_check unsigned longraw_copy_from_user(void *to, const void __user * from, unsigned long n){	if (__builtin_constant_p(n)) {		switch(n) {		case 1:			*(u8 *)to = *(u8 __force *)from;			return 0;		case 2:			*(u16 *)to = *(u16 __force *)from;			return 0;		case 4:			*(u32 *)to = *(u32 __force *)from;			return 0;#ifdef CONFIG_64BIT		case 8:			*(u64 *)to = *(u64 __force *)from;			return 0;#endif		}	} 	memcpy(to, (const void __force *)from, n);	return 0;} static inline __must_check unsigned longraw_copy_to_user(void __user *to, const void *from, unsigned long n){	if (__builtin_constant_p(n)) {		switch(n) {		case 1:			*(u8 __force *)to = *(u8 *)from;			return 0;		case 2:			*(u16 __force *)to = *(u16 *)from;			return 0;		case 4:			*(u32 __force *)to = *(u32 *)from;			return 0;#ifdef CONFIG_64BIT		case 8:			*(u64 __force *)to = *(u64 *)from;			return 0;#endif		default:			break;		}	} 	memcpy((void __force *)to, from, n);	return 0;}#define INLINE_COPY_FROM_USER#define INLINE_COPY_TO_USER#endif /* CONFIG_UACCESS_MEMCPY */ #define MAKE_MM_SEG(s)	((mm_segment_t) { (s) }) #ifndef KERNEL_DS#define KERNEL_DS	MAKE_MM_SEG(~0UL)#endif #ifndef USER_DS#define USER_DS		MAKE_MM_SEG(TASK_SIZE - 1)#endif #ifndef get_fs#define get_fs()	(current_thread_info()->addr_limit) static inline void set_fs(mm_segment_t fs){	current_thread_info()->addr_limit = fs;}#endif #ifndef uaccess_kernel#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)#endif #define access_ok(addr, size) __access_ok((unsigned long)(addr),(size)) /* * The architecture should really override this if possible, at least * doing a check on the get_fs() */#ifndef __access_okstatic inline int __access_ok(unsigned long addr, unsigned long size){	return 1;}#endif /* * These are the main single-value transfer routines.  They automatically * use the right size if we just have the right pointer type. * This version just falls back to copy_{from,to}_user, which should * provide a fast-path for small values. */#define __put_user(x, ptr) \({								\	__typeof__(*(ptr)) __x = (x);				\	int __pu_err = -EFAULT;					\        __chk_user_ptr(ptr);                                    \	switch (sizeof (*(ptr))) {				\	case 1:							\	case 2:							\	case 4:							\	case 8:							\		__pu_err = __put_user_fn(sizeof (*(ptr)),	\					 ptr, &__x);		\		break;						\	default:						\		__put_user_bad();				\		break;						\	 }							\	__pu_err;						\}) #define put_user(x, ptr)					\({								\	void __user *__p = (ptr);				\	might_fault();						\	access_ok(__p, sizeof(*ptr)) ?		\		__put_user((x), ((__typeof__(*(ptr)) __user *)__p)) :	\		-EFAULT;					\}) #ifndef __put_user_fn static inline int __put_user_fn(size_t size, void __user *ptr, void *x){	return unlikely(raw_copy_to_user(ptr, x, size)) ? -EFAULT : 0;} #define __put_user_fn(sz, u, k)	__put_user_fn(sz, u, k) #endif extern int __put_user_bad(void) __attribute__((noreturn)); #define __get_user(x, ptr)					\({								\	int __gu_err = -EFAULT;					\	__chk_user_ptr(ptr);					\	switch (sizeof(*(ptr))) {				\	case 1: {						\		unsigned char __x = 0;				\		__gu_err = __get_user_fn(sizeof (*(ptr)),	\					 ptr, &__x);		\		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\		break;						\	};							\	case 2: {						\		unsigned short __x = 0;				\		__gu_err = __get_user_fn(sizeof (*(ptr)),	\					 ptr, &__x);		\		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\		break;						\	};							\	case 4: {						\		unsigned int __x = 0;				\		__gu_err = __get_user_fn(sizeof (*(ptr)),	\					 ptr, &__x);		\		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\		break;						\	};							\	case 8: {						\		unsigned long long __x = 0;			\		__gu_err = __get_user_fn(sizeof (*(ptr)),	\					 ptr, &__x);		\		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\		break;						\	};							\	default:						\		__get_user_bad();				\		break;						\	}							\	__gu_err;						\}) #define get_user(x, ptr)					\({								\	const void __user *__p = (ptr);				\	might_fault();						\	access_ok(__p, sizeof(*ptr)) ?		\		__get_user((x), (__typeof__(*(ptr)) __user *)__p) :\		((x) = (__typeof__(*(ptr)))0,-EFAULT);		\}) #ifndef __get_user_fnstatic inline int __get_user_fn(size_t size, const void __user *ptr, void *x){	return unlikely(raw_copy_from_user(x, ptr, size)) ? -EFAULT : 0;} #define __get_user_fn(sz, u, k)	__get_user_fn(sz, u, k) #endif extern int __get_user_bad(void) __attribute__((noreturn)); /* * Copy a null terminated string from userspace. */#ifndef __strncpy_from_userstatic inline long__strncpy_from_user(char *dst, const char __user *src, long count){	char *tmp;	strncpy(dst, (const char __force *)src, count);	for (tmp = dst; *tmp && count > 0; tmp++, count--)		;	return (tmp - dst);}#endif static inline longstrncpy_from_user(char *dst, const char __user *src, long count){	if (!access_ok(src, 1))		return -EFAULT;	return __strncpy_from_user(dst, src, count);} /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */#ifndef __strnlen_user#define __strnlen_user(s, n) (strnlen((s), (n)) + 1)#endif /* * Unlike strnlen, strnlen_user includes the nul terminator in * its returned count. Callers should check for a returned value * greater than N as an indication the string is too long. */static inline long strnlen_user(const char __user *src, long n){	if (!access_ok(src, 1))		return 0;	return __strnlen_user(src, n);} /* * Zero Userspace */#ifndef __clear_userstatic inline __must_check unsigned long__clear_user(void __user *to, unsigned long n){	memset((void __force *)to, 0, n);	return 0;}#endif static inline __must_check unsigned longclear_user(void __user *to, unsigned long n){	might_fault();	if (!access_ok(to, n))		return n; 	return __clear_user(to, n);} #include <asm/extable.h> #endif /* __ASM_GENERIC_UACCESS_H */