Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | /*
* Copyright 2004-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*
* Based on: include/asm-m68knommu/uaccess.h
*/
#ifndef __BLACKFIN_UACCESS_H
#define __BLACKFIN_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <asm/segment.h>
#include <asm/sections.h>
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
static inline void set_fs(mm_segment_t fs)
{
current_thread_info()->addr_limit = fs;
}
#define segment_eq(a, b) ((a) == (b))
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size))
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*/
#ifndef CONFIG_ACCESS_CHECK
static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
#else
extern int _access_ok(unsigned long addr, unsigned long size);
#endif
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#define put_user(x, p) \
({ \
int _err = 0; \
typeof(*(p)) _x = (x); \
typeof(*(p)) __user *_p = (p); \
if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
_err = -EFAULT; \
} \
else { \
switch (sizeof (*(_p))) { \
case 1: \
__put_user_asm(_x, _p, B); \
break; \
case 2: \
__put_user_asm(_x, _p, W); \
break; \
case 4: \
__put_user_asm(_x, _p, ); \
break; \
case 8: { \
long _xl, _xh; \
_xl = ((__force long *)&_x)[0]; \
_xh = ((__force long *)&_x)[1]; \
__put_user_asm(_xl, ((__force long __user *)_p)+0, );\
__put_user_asm(_xh, ((__force long __user *)_p)+1, );\
} break; \
default: \
_err = __put_user_bad(); \
break; \
} \
} \
_err; \
})
#define __put_user(x, p) put_user(x, p)
static inline int bad_user_access_length(void)
{
panic("bad_user_access_length");
return -1;
}
#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
__FILE__, __LINE__, __func__),\
bad_user_access_length(), (-EFAULT))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __ptr(x) ((unsigned long __force *)(x))
#define __put_user_asm(x, p, bhw) \
__asm__ (#bhw"[%1] = %0;\n\t" \
: /* no outputs */ \
:"d" (x), "a" (__ptr(p)) : "memory")
#define get_user(x, ptr) \
({ \
int _err = 0; \
unsigned long _val = 0; \
const typeof(*(ptr)) __user *_p = (ptr); \
const size_t ptr_size = sizeof(*(_p)); \
if (likely(access_ok(VERIFY_READ, _p, ptr_size))) { \
BUILD_BUG_ON(ptr_size >= 8); \
switch (ptr_size) { \
case 1: \
__get_user_asm(_val, _p, B, (Z)); \
break; \
case 2: \
__get_user_asm(_val, _p, W, (Z)); \
break; \
case 4: \
__get_user_asm(_val, _p, , ); \
break; \
} \
} else \
_err = -EFAULT; \
x = (__force typeof(*(ptr)))_val; \
_err; \
})
#define __get_user(x, p) get_user(x, p)
#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
#define __get_user_asm(x, ptr, bhw, option) \
({ \
__asm__ __volatile__ ( \
"%0 =" #bhw "[%1]" #option ";" \
: "=d" (x) \
: "a" (__ptr(ptr))); \
})
#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
#define copy_to_user_ret(to, from, n, retval) ({ if (copy_to_user(to, from, n))\
return retval; })
#define copy_from_user_ret(to, from, n, retval) ({ if (copy_from_user(to, from, n))\
return retval; })
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
memcpy(to, (const void __force *)from, n);
else
return n;
return 0;
}
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
memcpy((void __force *)to, from, n);
else
return n;
SSYNC();
return 0;
}
/*
* Copy a null terminated string from userspace.
*/
static inline long __must_check
strncpy_from_user(char *dst, const char __user *src, long count)
{
char *tmp;
if (!access_ok(VERIFY_READ, src, 1))
return -EFAULT;
strncpy(dst, (const char __force *)src, count);
for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
return (tmp - dst);
}
/*
* Get the size of a string in user space.
* src: The string to measure
* n: The maximum valid length
*
* Get the size of a NUL-terminated string in user space.
*
* Returns the size of the string INCLUDING the terminating NUL.
* On exception, returns 0.
* If the string is too long, returns a value greater than n.
*/
static inline long __must_check strnlen_user(const char __user *src, long n)
{
if (!access_ok(VERIFY_READ, src, 1))
return 0;
return strnlen((const char __force *)src, n) + 1;
}
static inline long __must_check strlen_user(const char __user *src)
{
if (!access_ok(VERIFY_READ, src, 1))
return 0;
return strlen((const char __force *)src) + 1;
}
/*
* Zero Userspace
*/
static inline unsigned long __must_check
__clear_user(void __user *to, unsigned long n)
{
if (!access_ok(VERIFY_WRITE, to, n))
return n;
memset((void __force *)to, 0, n);
return 0;
}
#define clear_user(to, n) __clear_user(to, n)
/* How to interpret these return values:
* CORE: can be accessed by core load or dma memcpy
* CORE_ONLY: can only be accessed by core load
* DMA: can only be accessed by dma memcpy
* IDMA: can only be accessed by interprocessor dma memcpy (BF561)
* ITEST: can be accessed by isram memcpy or dma memcpy
*/
enum {
BFIN_MEM_ACCESS_CORE = 0,
BFIN_MEM_ACCESS_CORE_ONLY,
BFIN_MEM_ACCESS_DMA,
BFIN_MEM_ACCESS_IDMA,
BFIN_MEM_ACCESS_ITEST,
};
/**
* bfin_mem_access_type() - what kind of memory access is required
* @addr: the address to check
* @size: number of bytes needed
* @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above)
*/
int bfin_mem_access_type(unsigned long addr, unsigned long size);
#endif /* _BLACKFIN_UACCESS_H */
|