aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-sh/uaccess.h
diff options
context:
space:
mode:
authorPaul Mundt <lethal@linux-sh.org>2008-07-28 19:09:44 -0400
committerPaul Mundt <lethal@linux-sh.org>2008-07-28 19:09:44 -0400
commitf15cbe6f1a4b4d9df59142fc8e4abb973302cf44 (patch)
tree774d7b11abaaf33561ab8268bf51ddd9ceb79025 /include/asm-sh/uaccess.h
parent25326277d8d1393d1c66240e6255aca780f9e3eb (diff)
sh: migrate to arch/sh/include/
This follows the sparc changes a439fe51a1f8eb087c22dd24d69cebae4a3addac. Most of the moving about was done with Sam's directions at: http://marc.info/?l=linux-sh&m=121724823706062&w=2 with subsequent hacking and fixups entirely my fault. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/uaccess.h')
-rw-r--r--include/asm-sh/uaccess.h256
1 files changed, 0 insertions, 256 deletions
diff --git a/include/asm-sh/uaccess.h b/include/asm-sh/uaccess.h
deleted file mode 100644
index 45c2c9b2993d..000000000000
--- a/include/asm-sh/uaccess.h
+++ /dev/null
@@ -1,256 +0,0 @@
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/*
29 * Uh, these should become the main single-value transfer routines ...
30 * They automatically use the right size if we just have the right
31 * pointer type ...
32 *
33 * As SuperH uses the same address space for kernel and user data, we
34 * can just do these as direct assignments.
35 *
36 * Careful to not
37 * (a) re-use the arguments for side effects (sizeof is ok)
38 * (b) require any knowledge of processes at this stage
39 */
40#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
41#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
42
43/*
44 * The "__xxx" versions do not do address space checking, useful when
45 * doing multiple accesses to the same area (the user has to do the
46 * checks by hand with "access_ok()")
47 */
48#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
49#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
50
51struct __large_struct { unsigned long buf[100]; };
52#define __m(x) (*(struct __large_struct __user *)(x))
53
54#define __get_user_nocheck(x,ptr,size) \
55({ \
56 long __gu_err; \
57 unsigned long __gu_val; \
58 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
59 __chk_user_ptr(ptr); \
60 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
61 (x) = (__typeof__(*(ptr)))__gu_val; \
62 __gu_err; \
63})
64
65#define __get_user_check(x,ptr,size) \
66({ \
67 long __gu_err = -EFAULT; \
68 unsigned long __gu_val = 0; \
69 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
70 if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
71 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
72 (x) = (__typeof__(*(ptr)))__gu_val; \
73 __gu_err; \
74})
75
76#define __put_user_nocheck(x,ptr,size) \
77({ \
78 long __pu_err; \
79 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
80 __chk_user_ptr(ptr); \
81 __put_user_size((x), __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 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
90 __put_user_size((x), __pu_addr, (size), \
91 __pu_err); \
92 __pu_err; \
93})
94
95#ifdef CONFIG_SUPERH32
96# include "uaccess_32.h"
97#else
98# include "uaccess_64.h"
99#endif
100
101/* Generic arbitrary sized copy. */
102/* Return the number of bytes NOT copied */
103__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
104
105static __always_inline unsigned long
106__copy_from_user(void *to, const void __user *from, unsigned long n)
107{
108 return __copy_user(to, (__force void *)from, n);
109}
110
111static __always_inline unsigned long __must_check
112__copy_to_user(void __user *to, const void *from, unsigned long n)
113{
114 return __copy_user((__force void *)to, from, n);
115}
116
117#define __copy_to_user_inatomic __copy_to_user
118#define __copy_from_user_inatomic __copy_from_user
119
120/*
121 * Clear the area and return remaining number of bytes
122 * (on failure. Usually it's 0.)
123 */
124__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
125
126#define clear_user(addr,n) \
127({ \
128 void __user * __cl_addr = (addr); \
129 unsigned long __cl_size = (n); \
130 \
131 if (__cl_size && access_ok(VERIFY_WRITE, \
132 ((unsigned long)(__cl_addr)), __cl_size)) \
133 __cl_size = __clear_user(__cl_addr, __cl_size); \
134 \
135 __cl_size; \
136})
137
138/**
139 * strncpy_from_user: - Copy a NUL terminated string from userspace.
140 * @dst: Destination address, in kernel space. This buffer must be at
141 * least @count bytes long.
142 * @src: Source address, in user space.
143 * @count: Maximum number of bytes to copy, including the trailing NUL.
144 *
145 * Copies a NUL-terminated string from userspace to kernel space.
146 *
147 * On success, returns the length of the string (not including the trailing
148 * NUL).
149 *
150 * If access to userspace fails, returns -EFAULT (some data may have been
151 * copied).
152 *
153 * If @count is smaller than the length of the string, copies @count bytes
154 * and returns @count.
155 */
156#define strncpy_from_user(dest,src,count) \
157({ \
158 unsigned long __sfu_src = (unsigned long)(src); \
159 int __sfu_count = (int)(count); \
160 long __sfu_res = -EFAULT; \
161 \
162 if (__access_ok(__sfu_src, __sfu_count)) \
163 __sfu_res = __strncpy_from_user((unsigned long)(dest), \
164 __sfu_src, __sfu_count); \
165 \
166 __sfu_res; \
167})
168
169static inline unsigned long
170copy_from_user(void *to, const void __user *from, unsigned long n)
171{
172 unsigned long __copy_from = (unsigned long) from;
173 __kernel_size_t __copy_size = (__kernel_size_t) n;
174
175 if (__copy_size && __access_ok(__copy_from, __copy_size))
176 return __copy_user(to, from, __copy_size);
177
178 return __copy_size;
179}
180
181static inline unsigned long
182copy_to_user(void __user *to, const void *from, unsigned long n)
183{
184 unsigned long __copy_to = (unsigned long) to;
185 __kernel_size_t __copy_size = (__kernel_size_t) n;
186
187 if (__copy_size && __access_ok(__copy_to, __copy_size))
188 return __copy_user(to, from, __copy_size);
189
190 return __copy_size;
191}
192
193/**
194 * strnlen_user: - Get the size of a string in user space.
195 * @s: The string to measure.
196 * @n: The maximum valid length
197 *
198 * Context: User context only. This function may sleep.
199 *
200 * Get the size of a NUL-terminated string in user space.
201 *
202 * Returns the size of the string INCLUDING the terminating NUL.
203 * On exception, returns 0.
204 * If the string is too long, returns a value greater than @n.
205 */
206static inline long strnlen_user(const char __user *s, long n)
207{
208 if (!__addr_ok(s))
209 return 0;
210 else
211 return __strnlen_user(s, n);
212}
213
214/**
215 * strlen_user: - Get the size of a string in user space.
216 * @str: The string to measure.
217 *
218 * Context: User context only. This function may sleep.
219 *
220 * Get the size of a NUL-terminated string in user space.
221 *
222 * Returns the size of the string INCLUDING the terminating NUL.
223 * On exception, returns 0.
224 *
225 * If there is a limit on the length of a valid string, you may wish to
226 * consider using strnlen_user() instead.
227 */
228#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
229
230/*
231 * The exception table consists of pairs of addresses: the first is the
232 * address of an instruction that is allowed to fault, and the second is
233 * the address at which the program should continue. No registers are
234 * modified, so it is entirely up to the continuation code to figure out
235 * what to do.
236 *
237 * All the routines below use bits of fixup code that are out of line
238 * with the main instruction path. This means when everything is well,
239 * we don't even have to jump over them. Further, they do not intrude
240 * on our cache or tlb entries.
241 */
242struct exception_table_entry {
243 unsigned long insn, fixup;
244};
245
246#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
247#define ARCH_HAS_SEARCH_EXTABLE
248#endif
249
250int fixup_exception(struct pt_regs *regs);
251/* Returns 0 if exception not found and fixup.unit otherwise. */
252unsigned long search_exception_table(unsigned long addr);
253const struct exception_table_entry *search_exception_tables(unsigned long addr);
254
255
256#endif /* __ASM_SH_UACCESS_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-04 11:41:06 -0500