2  * include/asm-xtensa/uaccess.h
13  * Copyright (C) 2001 - 2005 Tensilica Inc.
22 #include <asm-generic/access_ok.h>
25  * These are the main single-value transfer routines.  They
26  * automatically use the right size if we just have the right pointer
35  * (a) re-use the arguments for side effects (sizeof is ok)
38 #define put_user(x, ptr)	__put_user_check((x), (ptr), sizeof(*(ptr)))  argument
39 #define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))  argument
47 #define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))  argument
48 #define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))  argument
53 #define __put_user_nocheck(x, ptr, size)		\  argument
56 	__put_user_size((x), (ptr), (size), __pu_err);	\
60 #define __put_user_check(x, ptr, size)					\  argument
62 	long __pu_err = -EFAULT;					\
64 	if (access_ok(__pu_addr, size))			\
65 		__put_user_size((x), __pu_addr, (size), __pu_err);	\
69 #define __put_user_size(x, ptr, size, retval)				\  argument
73 	switch (size) {							\
74 	case 1: __put_user_asm(x, ptr, retval, 1, "s8i", __cb);  break;	\
75 	case 2: __put_user_asm(x, ptr, retval, 2, "s16i", __cb); break;	\
76 	case 4: __put_user_asm(x, ptr, retval, 4, "s32i", __cb); break;	\
78 		     __typeof__(*ptr) __v64 = x;			\
79 		     retval = __copy_to_user(ptr, &__v64, 8) ? -EFAULT : 0;	\
89  * unaligned exception and an MMU-related exception (unaligned
96  * Double exception occurs for MMU-related cause (e.g., page not mapped).
104  * macro-specific labels such as 0f, 1f, %0, %2, and %3 must stay in
133 	"1: "insn"  %[x], %[mem]	\n"		\
147 	:[x] "r"(x_), [efault] "i"(-EFAULT))
149 #define __get_user_nocheck(x, ptr, size)			\  argument
152 	__get_user_size((x), (ptr), (size), __gu_err);		\
156 #define __get_user_check(x, ptr, size)					\  argument
158 	long __gu_err = -EFAULT;					\
160 	if (access_ok(__gu_addr, size))					\
161 		__get_user_size((x), __gu_addr, (size), __gu_err);	\
163 		(x) = (__typeof__(*(ptr)))0;				\
169 #define __get_user_size(x, ptr, size, retval)				\  argument
173 	switch (size) {							\
174 	case 1: __get_user_asm(x, ptr, retval, 1, "l8ui", __cb);  break;\
175 	case 2: __get_user_asm(x, ptr, retval, 2, "l16ui", __cb); break;\
176 	case 4: __get_user_asm(x, ptr, retval, 4, "l32i", __cb);  break;\
180 			retval = -EFAULT;				\
181 			(x) = (__typeof__(*(ptr)))0;			\
183 			(x) = *(__force __typeof__(*(ptr)) *)&__x;	\
188 		(x) = (__typeof__(*(ptr)))0;				\
203 		"1: "insn"  %[x], %[mem]	\n"	\
216 		:[err] "+r"(err_), [tmp] "=r"(cb), [x] "+r"(__x) \
217 		:[mem] "m"(*(addr_)), [efault] "i"(-EFAULT)); \
245  * returns zero if a problem occurs while accessing user-space memory.
251 __xtensa_clear_user(void __user *addr, unsigned long size)  in __xtensa_clear_user()  argument
253 	if (!__memset((void __force *)addr, 0, size))  in __xtensa_clear_user()
254 		return size;  in __xtensa_clear_user()
259 clear_user(void __user *addr, unsigned long size)  in clear_user()  argument
261 	if (access_ok(addr, size))  in clear_user()
262 		return __xtensa_clear_user(addr, size);  in clear_user()
263 	return size ? -EFAULT : 0;  in clear_user()
277 	return -EFAULT;  in strncpy_from_user()
284  * Return the size of a string (including the ending 0!)