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
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996, 1999, 2000, 2001 by Ralf Baechle
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
*/
#ifndef _ASM_UNALIGNED_H
#define _ASM_UNALIGNED_H
extern void __get_unaligned_bad_length(void);
extern void __put_unaligned_bad_length(void);
/*
* Load quad unaligned.
*/
static inline unsigned long __ldq_u(const unsigned long * __addr)
{
unsigned long __res;
__asm__("uld\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load long unaligned.
*/
static inline unsigned long __ldl_u(const unsigned int * __addr)
{
unsigned long __res;
__asm__("ulw\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load word unaligned.
*/
static inline unsigned long __ldw_u(const unsigned short * __addr)
{
unsigned long __res;
__asm__("ulh\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Store quad unaligned.
*/
static inline void __stq_u(unsigned long __val, unsigned long * __addr)
{
__asm__("usd\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store long unaligned.
*/
static inline void __stl_u(unsigned long __val, unsigned int * __addr)
{
__asm__("usw\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store word unaligned.
*/
static inline void __stw_u(unsigned long __val, unsigned short * __addr)
{
__asm__("ush\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* get_unaligned - get value from possibly mis-aligned location
* @ptr: pointer to value
*
* This macro should be used for accessing values larger in size than
* single bytes at locations that are expected to be improperly aligned,
* e.g. retrieving a u16 value from a location not u16-aligned.
*
* Note that unaligned accesses can be very expensive on some architectures.
*/
#define get_unaligned(ptr) \
({ \
__typeof__(*(ptr)) __val; \
\
switch (sizeof(*(ptr))) { \
case 1: \
__val = *(const unsigned char *)(ptr); \
break; \
case 2: \
__val = __ldw_u((const unsigned short *)(ptr)); \
break; \
case 4: \
__val = __ldl_u((const unsigned int *)(ptr)); \
break; \
case 8: \
__val = __ldq_u((const unsigned long *)(ptr)); \
break; \
default: \
__get_unaligned_bad_length(); \
break; \
} \
\
__val; \
})
/*
* put_unaligned - put value to a possibly mis-aligned location
* @val: value to place
* @ptr: pointer to location
*
* This macro should be used for placing values larger in size than
* single bytes at locations that are expected to be improperly aligned,
* e.g. writing a u16 value to a location not u16-aligned.
*
* Note that unaligned accesses can be very expensive on some architectures.
*/
#define put_unaligned(val,ptr) \
do { \
switch (sizeof(*(ptr))) { \
case 1: \
*(unsigned char *)(ptr) = (val); \
break; \
case 2: \
__stw_u((val), (unsigned short *)(ptr)); \
break; \
case 4: \
__stl_u((val), (unsigned int *)(ptr)); \
break; \
case 8: \
__stq_u((val), (unsigned long long *)(ptr)); \
break; \
default: \
__put_unaligned_bad_length(); \
break; \
} \
} while(0)
#endif /* _ASM_UNALIGNED_H */
|
