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
53 struct __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
105 extern long strncpy_from_user(char *dest, const char __user *src, long count);
106
107 extern __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
113 static __always_inline unsigned long
raw_copy_from_user(void * to,const void __user * from,unsigned long n)114 raw_copy_from_user(void *to, const void __user *from, unsigned long n)
115 {
116 return __copy_user(to, (__force void *)from, n);
117 }
118
119 static __always_inline unsigned long __must_check
raw_copy_to_user(void __user * to,const void * from,unsigned long n)120 raw_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
144 extern void *set_exception_table_vec(unsigned int vec, void *handler);
145
set_exception_table_evt(unsigned int evt,void * handler)146 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
147 {
148 return set_exception_table_vec(evt >> 5, handler);
149 }
150
151 struct 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
156 int 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 */
160