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Linux/arch/sh/include/asm/uaccess.h

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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/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
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
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 
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 

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