1
2
3
4#include <linux/uaccess.h>
5#include <linux/types.h>
6
7unsigned long raw_copy_from_user(void *to, const void *from,
8 unsigned long n)
9{
10 int tmp, nsave;
11
12 __asm__ __volatile__(
13 "0: cmpnei %1, 0 \n"
14 " bf 7f \n"
15 " mov %3, %1 \n"
16 " or %3, %2 \n"
17 " andi %3, 3 \n"
18 " cmpnei %3, 0 \n"
19 " bf 1f \n"
20 " br 5f \n"
21 "1: cmplti %0, 16 \n"
22 " bt 3f \n"
23 "2: ldw %3, (%2, 0) \n"
24 "10: ldw %4, (%2, 4) \n"
25 " stw %3, (%1, 0) \n"
26 " stw %4, (%1, 4) \n"
27 "11: ldw %3, (%2, 8) \n"
28 "12: ldw %4, (%2, 12) \n"
29 " stw %3, (%1, 8) \n"
30 " stw %4, (%1, 12) \n"
31 " addi %2, 16 \n"
32 " addi %1, 16 \n"
33 " subi %0, 16 \n"
34 " br 1b \n"
35 "3: cmplti %0, 4 \n"
36 " bt 5f \n"
37 "4: ldw %3, (%2, 0) \n"
38 " stw %3, (%1, 0) \n"
39 " addi %2, 4 \n"
40 " addi %1, 4 \n"
41 " subi %0, 4 \n"
42 " br 3b \n"
43 "5: cmpnei %0, 0 \n"
44 " bf 7f \n"
45 "6: ldb %3, (%2, 0) \n"
46 " stb %3, (%1, 0) \n"
47 " addi %2, 1 \n"
48 " addi %1, 1 \n"
49 " subi %0, 1 \n"
50 " br 5b \n"
51 "8: stw %3, (%1, 0) \n"
52 " subi %0, 4 \n"
53 " bf 7f \n"
54 "9: subi %0, 8 \n"
55 " bf 7f \n"
56 "13: stw %3, (%1, 8) \n"
57 " subi %0, 12 \n"
58 " bf 7f \n"
59 ".section __ex_table, \"a\" \n"
60 ".align 2 \n"
61 ".long 2b, 7f \n"
62 ".long 4b, 7f \n"
63 ".long 6b, 7f \n"
64 ".long 10b, 8b \n"
65 ".long 11b, 9b \n"
66 ".long 12b,13b \n"
67 ".previous \n"
68 "7: \n"
69 : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave),
70 "=r"(tmp)
71 : "0"(n), "1"(to), "2"(from)
72 : "memory");
73
74 return n;
75}
76EXPORT_SYMBOL(raw_copy_from_user);
77
78unsigned long raw_copy_to_user(void *to, const void *from,
79 unsigned long n)
80{
81 int w0, w1, w2, w3;
82
83 __asm__ __volatile__(
84 "0: cmpnei %1, 0 \n"
85 " bf 8f \n"
86 " mov %3, %1 \n"
87 " or %3, %2 \n"
88 " andi %3, 3 \n"
89 " cmpnei %3, 0 \n"
90 " bf 1f \n"
91 " br 5f \n"
92 "1: cmplti %0, 16 \n"
93 " bt 3f \n"
94 " ldw %3, (%2, 0) \n"
95 " ldw %4, (%2, 4) \n"
96 " ldw %5, (%2, 8) \n"
97 " ldw %6, (%2, 12) \n"
98 "2: stw %3, (%1, 0) \n"
99 "9: stw %4, (%1, 4) \n"
100 "10: stw %5, (%1, 8) \n"
101 "11: stw %6, (%1, 12) \n"
102 " addi %2, 16 \n"
103 " addi %1, 16 \n"
104 " subi %0, 16 \n"
105 " br 1b \n"
106 "3: cmplti %0, 4 \n"
107 " bt 5f \n"
108 " ldw %3, (%2, 0) \n"
109 "4: stw %3, (%1, 0) \n"
110 " addi %2, 4 \n"
111 " addi %1, 4 \n"
112 " subi %0, 4 \n"
113 " br 3b \n"
114 "5: cmpnei %0, 0 \n"
115 " bf 13f \n"
116 " ldb %3, (%2, 0) \n"
117 "6: stb %3, (%1, 0) \n"
118 " addi %2, 1 \n"
119 " addi %1, 1 \n"
120 " subi %0, 1 \n"
121 " br 5b \n"
122 "7: subi %0, 4 \n"
123 "8: subi %0, 4 \n"
124 "12: subi %0, 4 \n"
125 " br 13f \n"
126 ".section __ex_table, \"a\" \n"
127 ".align 2 \n"
128 ".long 2b, 13f \n"
129 ".long 4b, 13f \n"
130 ".long 6b, 13f \n"
131 ".long 9b, 12b \n"
132 ".long 10b, 8b \n"
133 ".long 11b, 7b \n"
134 ".previous \n"
135 "13: \n"
136 : "=r"(n), "=r"(to), "=r"(from), "=r"(w0),
137 "=r"(w1), "=r"(w2), "=r"(w3)
138 : "0"(n), "1"(to), "2"(from)
139 : "memory");
140
141 return n;
142}
143EXPORT_SYMBOL(raw_copy_to_user);
144
145
146
147
148
149
150
151
152
153
154
155
156unsigned long
157__clear_user(void __user *to, unsigned long n)
158{
159 int data, value, tmp;
160
161 __asm__ __volatile__(
162 "0: cmpnei %1, 0 \n"
163 " bf 7f \n"
164 " mov %3, %1 \n"
165 " andi %3, 3 \n"
166 " cmpnei %3, 0 \n"
167 " bf 1f \n"
168 " br 5f \n"
169 "1: cmplti %0, 32 \n"
170 " bt 3f \n"
171 "8: stw %2, (%1, 0) \n"
172 "10: stw %2, (%1, 4) \n"
173 "11: stw %2, (%1, 8) \n"
174 "12: stw %2, (%1, 12) \n"
175 "13: stw %2, (%1, 16) \n"
176 "14: stw %2, (%1, 20) \n"
177 "15: stw %2, (%1, 24) \n"
178 "16: stw %2, (%1, 28) \n"
179 " addi %1, 32 \n"
180 " subi %0, 32 \n"
181 " br 1b \n"
182 "3: cmplti %0, 4 \n"
183 " bt 5f \n"
184 "4: stw %2, (%1, 0) \n"
185 " addi %1, 4 \n"
186 " subi %0, 4 \n"
187 " br 3b \n"
188 "5: cmpnei %0, 0 \n"
189 "9: bf 7f \n"
190 "6: stb %2, (%1, 0) \n"
191 " addi %1, 1 \n"
192 " subi %0, 1 \n"
193 " br 5b \n"
194 ".section __ex_table,\"a\" \n"
195 ".align 2 \n"
196 ".long 8b, 9b \n"
197 ".long 10b, 9b \n"
198 ".long 11b, 9b \n"
199 ".long 12b, 9b \n"
200 ".long 13b, 9b \n"
201 ".long 14b, 9b \n"
202 ".long 15b, 9b \n"
203 ".long 16b, 9b \n"
204 ".long 4b, 9b \n"
205 ".long 6b, 9b \n"
206 ".previous \n"
207 "7: \n"
208 : "=r"(n), "=r" (data), "=r"(value), "=r"(tmp)
209 : "0"(n), "1"(to), "2"(0)
210 : "memory");
211
212 return n;
213}
214EXPORT_SYMBOL(__clear_user);
215
