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