1#ifndef __ASM_SH_UACCESS_H
2#define __ASM_SH_UACCESS_H
3
4#include <linux/errno.h>
5#include <linux/sched.h>
6#include <asm/segment.h>
7
8#define VERIFY_READ    0
9#define VERIFY_WRITE   1
10
11#define __addr_ok(addr) \
12	((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
13
14/*
15 * __access_ok: Check if address with size is OK or not.
16 *
17 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
18 *
19 * sum := addr + size;  carry? --> flag = true;
20 * if (sum >= addr_limit) flag = true;
21 */
22#define __access_ok(addr, size)		\
23	(__addr_ok((addr) + (size)))
24#define access_ok(type, 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(VERIFY_READ, __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(VERIFY_WRITE, __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 strlen_user(const char __user *str);
108extern __must_check long strnlen_user(const char __user *str, long n);
109
110/* Generic arbitrary sized copy.  */
111/* Return the number of bytes NOT copied */
112__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
113
114static __always_inline unsigned long
115__copy_from_user(void *to, const void __user *from, unsigned long n)
116{
117	return __copy_user(to, (__force void *)from, n);
118}
119
120static __always_inline unsigned long __must_check
121__copy_to_user(void __user *to, const void *from, unsigned long n)
122{
123	return __copy_user((__force void *)to, from, n);
124}
125
126#define __copy_to_user_inatomic __copy_to_user
127#define __copy_from_user_inatomic __copy_from_user
128
129/*
130 * Clear the area and return remaining number of bytes
131 * (on failure.  Usually it's 0.)
132 */
133__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
134
135#define clear_user(addr,n)						\
136({									\
137	void __user * __cl_addr = (addr);				\
138	unsigned long __cl_size = (n);					\
139									\
140	if (__cl_size && access_ok(VERIFY_WRITE,			\
141		((unsigned long)(__cl_addr)), __cl_size))		\
142		__cl_size = __clear_user(__cl_addr, __cl_size);		\
143									\
144	__cl_size;							\
145})
146
147static inline unsigned long
148copy_from_user(void *to, const void __user *from, unsigned long n)
149{
150	unsigned long __copy_from = (unsigned long) from;
151	__kernel_size_t __copy_size = (__kernel_size_t) n;
152
153	if (__copy_size && __access_ok(__copy_from, __copy_size))
154		return __copy_user(to, from, __copy_size);
155
156	return __copy_size;
157}
158
159static inline unsigned long
160copy_to_user(void __user *to, const void *from, unsigned long n)
161{
162	unsigned long __copy_to = (unsigned long) to;
163	__kernel_size_t __copy_size = (__kernel_size_t) n;
164
165	if (__copy_size && __access_ok(__copy_to, __copy_size))
166		return __copy_user(to, from, __copy_size);
167
168	return __copy_size;
169}
170
171/*
172 * The exception table consists of pairs of addresses: the first is the
173 * address of an instruction that is allowed to fault, and the second is
174 * the address at which the program should continue.  No registers are
175 * modified, so it is entirely up to the continuation code to figure out
176 * what to do.
177 *
178 * All the routines below use bits of fixup code that are out of line
179 * with the main instruction path.  This means when everything is well,
180 * we don't even have to jump over them.  Further, they do not intrude
181 * on our cache or tlb entries.
182 */
183struct exception_table_entry {
184	unsigned long insn, fixup;
185};
186
187#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
188#define ARCH_HAS_SEARCH_EXTABLE
189#endif
190
191int fixup_exception(struct pt_regs *regs);
192/* Returns 0 if exception not found and fixup.unit otherwise.  */
193unsigned long search_exception_table(unsigned long addr);
194const struct exception_table_entry *search_exception_tables(unsigned long addr);
195
196extern void *set_exception_table_vec(unsigned int vec, void *handler);
197
198static inline void *set_exception_table_evt(unsigned int evt, void *handler)
199{
200	return set_exception_table_vec(evt >> 5, handler);
201}
202
203struct mem_access {
204	unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
205	unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
206};
207
208int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
209			    struct mem_access *ma, int, unsigned long address);
210
211#endif /* __ASM_SH_UACCESS_H */
212