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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 */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_UACCESS_H
3#define __ASM_SH_UACCESS_H
4
5#include <asm/segment.h>
6#include <asm/extable.h>
7
8#define __addr_ok(addr) \
9 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
10
11/*
12 * __access_ok: Check if address with size is OK or not.
13 *
14 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
15 *
16 * sum := addr + size; carry? --> flag = true;
17 * if (sum >= addr_limit) flag = true;
18 */
19#define __access_ok(addr, size) ({ \
20 unsigned long __ao_a = (addr), __ao_b = (size); \
21 unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \
22 __ao_end >= __ao_a && __addr_ok(__ao_end); })
23
24#define access_ok(addr, size) \
25 (__chk_user_ptr(addr), \
26 __access_ok((unsigned long __force)(addr), (size)))
27
28#define user_addr_max() (current_thread_info()->addr_limit.seg)
29
30/*
31 * Uh, these should become the main single-value transfer routines ...
32 * They automatically use the right size if we just have the right
33 * pointer type ...
34 *
35 * As SuperH uses the same address space for kernel and user data, we
36 * can just do these as direct assignments.
37 *
38 * Careful to not
39 * (a) re-use the arguments for side effects (sizeof is ok)
40 * (b) require any knowledge of processes at this stage
41 */
42#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
43#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
44
45/*
46 * The "__xxx" versions do not do address space checking, useful when
47 * doing multiple accesses to the same area (the user has to do the
48 * checks by hand with "access_ok()")
49 */
50#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
51#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
52
53struct __large_struct { unsigned long buf[100]; };
54#define __m(x) (*(struct __large_struct __user *)(x))
55
56#define __get_user_nocheck(x,ptr,size) \
57({ \
58 long __gu_err; \
59 unsigned long __gu_val; \
60 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
61 __chk_user_ptr(ptr); \
62 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
63 (x) = (__force __typeof__(*(ptr)))__gu_val; \
64 __gu_err; \
65})
66
67#define __get_user_check(x,ptr,size) \
68({ \
69 long __gu_err = -EFAULT; \
70 unsigned long __gu_val = 0; \
71 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
72 if (likely(access_ok(__gu_addr, (size)))) \
73 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
74 (x) = (__force __typeof__(*(ptr)))__gu_val; \
75 __gu_err; \
76})
77
78#define __put_user_nocheck(x,ptr,size) \
79({ \
80 long __pu_err; \
81 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
82 __typeof__(*(ptr)) __pu_val = x; \
83 __chk_user_ptr(ptr); \
84 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
85 __pu_err; \
86})
87
88#define __put_user_check(x,ptr,size) \
89({ \
90 long __pu_err = -EFAULT; \
91 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
92 __typeof__(*(ptr)) __pu_val = x; \
93 if (likely(access_ok(__pu_addr, size))) \
94 __put_user_size(__pu_val, __pu_addr, (size), \
95 __pu_err); \
96 __pu_err; \
97})
98
99#ifdef CONFIG_SUPERH32
100# include <asm/uaccess_32.h>
101#else
102# include <asm/uaccess_64.h>
103#endif
104
105extern long strncpy_from_user(char *dest, const char __user *src, long count);
106
107extern __must_check long strnlen_user(const char __user *str, long n);
108
109/* Generic arbitrary sized copy. */
110/* Return the number of bytes NOT copied */
111__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
112
113static __always_inline unsigned long
114raw_copy_from_user(void *to, const void __user *from, unsigned long n)
115{
116 return __copy_user(to, (__force void *)from, n);
117}
118
119static __always_inline unsigned long __must_check
120raw_copy_to_user(void __user *to, const void *from, unsigned long n)
121{
122 return __copy_user((__force void *)to, from, n);
123}
124#define INLINE_COPY_FROM_USER
125#define INLINE_COPY_TO_USER
126
127/*
128 * Clear the area and return remaining number of bytes
129 * (on failure. Usually it's 0.)
130 */
131__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
132
133#define clear_user(addr,n) \
134({ \
135 void __user * __cl_addr = (addr); \
136 unsigned long __cl_size = (n); \
137 \
138 if (__cl_size && access_ok(__cl_addr, __cl_size)) \
139 __cl_size = __clear_user(__cl_addr, __cl_size); \
140 \
141 __cl_size; \
142})
143
144extern void *set_exception_table_vec(unsigned int vec, void *handler);
145
146static inline void *set_exception_table_evt(unsigned int evt, void *handler)
147{
148 return set_exception_table_vec(evt >> 5, handler);
149}
150
151struct mem_access {
152 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
153 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
154};
155
156int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
157 struct mem_access *ma, int, unsigned long address);
158
159#endif /* __ASM_SH_UACCESS_H */