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
|
/*
* 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 by Ralf Baechle
* Copyright (C) 1999, 2000 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 double unaligned.
*
* This could have been implemented in plain C like IA64 but egcs 1.0.3a
* inflates this to 23 instructions ...
*/
extern inline unsigned long long __ldq_u(const unsigned long long * __addr)
{
unsigned long long __res;
__asm__("ulw\t%0, %1\n\t"
"ulw\t%D0, 4+%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load word unaligned.
*/
extern inline unsigned long __ldl_u(const unsigned int * __addr)
{
unsigned long __res;
__asm__("ulw\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load halfword unaligned.
*/
extern inline unsigned long __ldw_u(const unsigned short * __addr)
{
unsigned long __res;
__asm__("ulh\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Store doubleword ununaligned.
*/
extern inline void __stq_u(unsigned long __val, unsigned long long * __addr)
{
__asm__("usw\t%1, %0\n\t"
"usw\t%D1, 4+%0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store long ununaligned.
*/
extern inline void __stl_u(unsigned long __val, unsigned int * __addr)
{
__asm__("usw\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store word ununaligned.
*/
extern inline void __stw_u(unsigned long __val, unsigned short * __addr)
{
__asm__("ush\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* The main single-value unaligned transfer routines.
*/
#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 long *)ptr); \
break; \
default: \
__get_unaligned_bad_length(); \
break; \
} \
\
__val; \
})
#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 */
|
