1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_UACCESS_H
3#define __ASM_SH_UACCESS_H
4
5#include <asm/extable.h>
6#include <asm-generic/access_ok.h>
7
8/*
9 * Uh, these should become the main single-value transfer routines ...
10 * They automatically use the right size if we just have the right
11 * pointer type ...
12 *
13 * As SuperH uses the same address space for kernel and user data, we
14 * can just do these as direct assignments.
15 *
16 * Careful to not
17 * (a) re-use the arguments for side effects (sizeof is ok)
18 * (b) require any knowledge of processes at this stage
19 */
20#define put_user(x,ptr)		__put_user_check((x), (ptr), sizeof(*(ptr)))
21#define get_user(x,ptr)		__get_user_check((x), (ptr), sizeof(*(ptr)))
22
23/*
24 * The "__xxx" versions do not do address space checking, useful when
25 * doing multiple accesses to the same area (the user has to do the
26 * checks by hand with "access_ok()")
27 */
28#define __put_user(x,ptr)	__put_user_nocheck((x), (ptr), sizeof(*(ptr)))
29#define __get_user(x,ptr)	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
30
31struct __large_struct { unsigned long buf[100]; };
32#define __m(x) (*(struct __large_struct __user *)(x))
33
34#define __get_user_nocheck(x,ptr,size)				\
35({								\
36	long __gu_err;						\
37	unsigned long __gu_val;					\
38	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
39	__chk_user_ptr(ptr);					\
40	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
41	(x) = (__force __typeof__(*(ptr)))__gu_val;		\
42	__gu_err;						\
43})
44
45#define __get_user_check(x,ptr,size)					\
46({									\
47	long __gu_err = -EFAULT;					\
48	unsigned long __gu_val = 0;					\
49	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);			\
50	if (likely(access_ok(__gu_addr, (size))))		\
51		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
52	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
53	__gu_err;							\
54})
55
56#define __put_user_nocheck(x,ptr,size)				\
57({								\
58	long __pu_err;						\
59	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
60	__typeof__(*(ptr)) __pu_val = x;			\
61	__chk_user_ptr(ptr);					\
62	__put_user_size(__pu_val, __pu_addr, (size), __pu_err);	\
63	__pu_err;						\
64})
65
66#define __put_user_check(x,ptr,size)				\
67({								\
68	long __pu_err = -EFAULT;				\
69	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
70	__typeof__(*(ptr)) __pu_val = x;			\
71	if (likely(access_ok(__pu_addr, size)))	\
72		__put_user_size(__pu_val, __pu_addr, (size),	\
73				__pu_err);			\
74	__pu_err;						\
75})
76
77# include <asm/uaccess_32.h>
78
79extern long strncpy_from_user(char *dest, const char __user *src, long count);
80
81extern __must_check long strnlen_user(const char __user *str, long n);
82
83/* Generic arbitrary sized copy.  */
84/* Return the number of bytes NOT copied */
85__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
86
87static __always_inline unsigned long
88raw_copy_from_user(void *to, const void __user *from, unsigned long n)
89{
90	return __copy_user(to, (__force void *)from, n);
91}
92
93static __always_inline unsigned long __must_check
94raw_copy_to_user(void __user *to, const void *from, unsigned long n)
95{
96	return __copy_user((__force void *)to, from, n);
97}
98#define INLINE_COPY_FROM_USER
99#define INLINE_COPY_TO_USER
100
101/*
102 * Clear the area and return remaining number of bytes
103 * (on failure.  Usually it's 0.)
104 */
105__kernel_size_t __clear_user(void __user *addr, __kernel_size_t size);
106
107#define clear_user(addr,n)						\
108({									\
109	void __user * __cl_addr = (addr);				\
110	unsigned long __cl_size = (n);					\
111									\
112	if (__cl_size && access_ok(__cl_addr, __cl_size))		\
113		__cl_size = __clear_user(__cl_addr, __cl_size);		\
114									\
115	__cl_size;							\
116})
117
118extern void *set_exception_table_vec(unsigned int vec, void *handler);
119
120static inline void *set_exception_table_evt(unsigned int evt, void *handler)
121{
122	return set_exception_table_vec(evt >> 5, handler);
123}
124
125struct mem_access {
126	unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
127	unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
128};
129
130int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
131			    struct mem_access *ma, int, unsigned long address);
132
133#endif /* __ASM_SH_UACCESS_H */
134