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
|
/*
* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2009 PetaLogix
* Copyright (C) 2007 LynuxWorks, Inc.
*
* 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.
*/
#include <linux/errno.h>
#include <linux/linkage.h>
/*
* int __strncpy_user(char *to, char *from, int len);
*
* Returns:
* -EFAULT for an exception
* len if we hit the buffer limit
* bytes copied
*/
.text
.globl __strncpy_user;
.type __strncpy_user, @function
.align 4;
__strncpy_user:
/*
* r5 - to
* r6 - from
* r7 - len
* r3 - temp count
* r4 - temp val
*/
addik r3,r7,0 /* temp_count = len */
beqi r3,3f
1:
lbu r4,r6,r0
sb r4,r5,r0
addik r3,r3,-1
beqi r3,2f /* break on len */
addik r5,r5,1
bneid r4,1b
addik r6,r6,1 /* delay slot */
addik r3,r3,1 /* undo "temp_count--" */
2:
rsubk r3,r3,r7 /* temp_count = len - temp_count */
3:
rtsd r15,8
nop
.size __strncpy_user, . - __strncpy_user
.section .fixup, "ax"
.align 2
4:
brid 3b
addik r3,r0, -EFAULT
.section __ex_table, "a"
.word 1b,4b
/*
* int __strnlen_user(char __user *str, int maxlen);
*
* Returns:
* 0 on error
* maxlen + 1 if no NUL byte found within maxlen bytes
* size of the string (including NUL byte)
*/
.text
.globl __strnlen_user;
.type __strnlen_user, @function
.align 4;
__strnlen_user:
addik r3,r6,0
beqi r3,3f
1:
lbu r4,r5,r0
beqid r4,2f /* break on NUL */
addik r3,r3,-1 /* delay slot */
bneid r3,1b
addik r5,r5,1 /* delay slot */
addik r3,r3,-1 /* for break on len */
2:
rsubk r3,r3,r6
3:
rtsd r15,8
nop
.size __strnlen_user, . - __strnlen_user
.section .fixup,"ax"
4:
brid 3b
addk r3,r0,r0
.section __ex_table,"a"
.word 1b,4b
/*
* int __copy_tofrom_user(char *to, char *from, int len)
* Return:
* 0 on success
* number of not copied bytes on error
*/
.text
.globl __copy_tofrom_user;
.type __copy_tofrom_user, @function
.align 4;
__copy_tofrom_user:
/*
* r5 - to
* r6 - from
* r7, r3 - count
* r4 - tempval
*/
beqid r7, 0f /* zero size is not likely */
andi r3, r7, 0x3 /* filter add count */
bneid r3, 4f /* if is odd value then byte copying */
or r3, r5, r6 /* find if is any to/from unaligned */
andi r3, r3, 0x3 /* mask unaligned */
bneid r3, 1f /* it is unaligned -> then jump */
or r3, r0, r0
/* at least one 4 byte copy */
5: lw r4, r6, r3
6: sw r4, r5, r3
addik r7, r7, -4
bneid r7, 5b
addik r3, r3, 4
addik r3, r7, 0
rtsd r15, 8
nop
4: or r3, r0, r0
1: lbu r4,r6,r3
2: sb r4,r5,r3
addik r7,r7,-1
bneid r7,1b
addik r3,r3,1 /* delay slot */
0:
addik r3,r7,0
rtsd r15,8
nop
.size __copy_tofrom_user, . - __copy_tofrom_user
.section __ex_table,"a"
.word 1b,0b,2b,0b,5b,0b,6b,0b
|
