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d94af931 RZ |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file COPYING in the main directory of this archive | |
4 | * for more details. | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
7c0f6ba6 | 8 | #include <linux/uaccess.h> |
d94af931 RZ |
9 | |
10 | unsigned long __generic_copy_from_user(void *to, const void __user *from, | |
11 | unsigned long n) | |
12 | { | |
13 | unsigned long tmp, res; | |
14 | ||
15 | asm volatile ("\n" | |
16 | " tst.l %0\n" | |
17 | " jeq 2f\n" | |
e08d703c | 18 | "1: "MOVES".l (%1)+,%3\n" |
d94af931 RZ |
19 | " move.l %3,(%2)+\n" |
20 | " subq.l #1,%0\n" | |
21 | " jne 1b\n" | |
22 | "2: btst #1,%5\n" | |
23 | " jeq 4f\n" | |
e08d703c | 24 | "3: "MOVES".w (%1)+,%3\n" |
d94af931 RZ |
25 | " move.w %3,(%2)+\n" |
26 | "4: btst #0,%5\n" | |
27 | " jeq 6f\n" | |
e08d703c | 28 | "5: "MOVES".b (%1)+,%3\n" |
d94af931 RZ |
29 | " move.b %3,(%2)+\n" |
30 | "6:\n" | |
31 | " .section .fixup,\"ax\"\n" | |
32 | " .even\n" | |
7cefa5a0 | 33 | "10: lsl.l #2,%0\n" |
d94af931 RZ |
34 | " btst #1,%5\n" |
35 | " jeq 8f\n" | |
7cefa5a0 | 36 | "30: addq.l #2,%0\n" |
d94af931 RZ |
37 | "8: btst #0,%5\n" |
38 | " jeq 6b\n" | |
7cefa5a0 | 39 | "50: addq.l #1,%0\n" |
d94af931 RZ |
40 | " jra 6b\n" |
41 | " .previous\n" | |
42 | "\n" | |
43 | " .section __ex_table,\"a\"\n" | |
44 | " .align 4\n" | |
45 | " .long 1b,10b\n" | |
46 | " .long 3b,30b\n" | |
47 | " .long 5b,50b\n" | |
48 | " .previous" | |
631d8b67 | 49 | : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) |
d94af931 RZ |
50 | : "0" (n / 4), "d" (n & 3)); |
51 | ||
52 | return res; | |
53 | } | |
54 | EXPORT_SYMBOL(__generic_copy_from_user); | |
55 | ||
56 | unsigned long __generic_copy_to_user(void __user *to, const void *from, | |
57 | unsigned long n) | |
58 | { | |
59 | unsigned long tmp, res; | |
60 | ||
61 | asm volatile ("\n" | |
62 | " tst.l %0\n" | |
63 | " jeq 4f\n" | |
64 | "1: move.l (%1)+,%3\n" | |
e08d703c | 65 | "2: "MOVES".l %3,(%2)+\n" |
d94af931 RZ |
66 | "3: subq.l #1,%0\n" |
67 | " jne 1b\n" | |
68 | "4: btst #1,%5\n" | |
69 | " jeq 6f\n" | |
70 | " move.w (%1)+,%3\n" | |
e08d703c | 71 | "5: "MOVES".w %3,(%2)+\n" |
d94af931 RZ |
72 | "6: btst #0,%5\n" |
73 | " jeq 8f\n" | |
74 | " move.b (%1)+,%3\n" | |
e08d703c | 75 | "7: "MOVES".b %3,(%2)+\n" |
d94af931 RZ |
76 | "8:\n" |
77 | " .section .fixup,\"ax\"\n" | |
78 | " .even\n" | |
79 | "20: lsl.l #2,%0\n" | |
80 | "50: add.l %5,%0\n" | |
6c04c28a | 81 | " jra 8b\n" |
d94af931 RZ |
82 | " .previous\n" |
83 | "\n" | |
84 | " .section __ex_table,\"a\"\n" | |
85 | " .align 4\n" | |
86 | " .long 2b,20b\n" | |
87 | " .long 3b,20b\n" | |
88 | " .long 5b,50b\n" | |
89 | " .long 6b,50b\n" | |
90 | " .long 7b,50b\n" | |
91 | " .long 8b,50b\n" | |
92 | " .previous" | |
631d8b67 | 93 | : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) |
d94af931 RZ |
94 | : "0" (n / 4), "d" (n & 3)); |
95 | ||
96 | return res; | |
97 | } | |
98 | EXPORT_SYMBOL(__generic_copy_to_user); | |
99 | ||
d94af931 RZ |
100 | /* |
101 | * Zero Userspace | |
102 | */ | |
103 | ||
3c46bdca | 104 | unsigned long __clear_user(void __user *to, unsigned long n) |
d94af931 RZ |
105 | { |
106 | unsigned long res; | |
107 | ||
108 | asm volatile ("\n" | |
109 | " tst.l %0\n" | |
110 | " jeq 3f\n" | |
e08d703c | 111 | "1: "MOVES".l %2,(%1)+\n" |
d94af931 RZ |
112 | "2: subq.l #1,%0\n" |
113 | " jne 1b\n" | |
114 | "3: btst #1,%4\n" | |
115 | " jeq 5f\n" | |
e08d703c | 116 | "4: "MOVES".w %2,(%1)+\n" |
d94af931 RZ |
117 | "5: btst #0,%4\n" |
118 | " jeq 7f\n" | |
e08d703c | 119 | "6: "MOVES".b %2,(%1)\n" |
d94af931 RZ |
120 | "7:\n" |
121 | " .section .fixup,\"ax\"\n" | |
122 | " .even\n" | |
123 | "10: lsl.l #2,%0\n" | |
124 | "40: add.l %4,%0\n" | |
125 | " jra 7b\n" | |
126 | " .previous\n" | |
127 | "\n" | |
128 | " .section __ex_table,\"a\"\n" | |
129 | " .align 4\n" | |
130 | " .long 1b,10b\n" | |
131 | " .long 2b,10b\n" | |
132 | " .long 4b,40b\n" | |
133 | " .long 5b,40b\n" | |
134 | " .long 6b,40b\n" | |
135 | " .long 7b,40b\n" | |
136 | " .previous" | |
137 | : "=d" (res), "+a" (to) | |
631d8b67 | 138 | : "d" (0), "0" (n / 4), "d" (n & 3)); |
d94af931 RZ |
139 | |
140 | return res; | |
141 | } | |
3c46bdca | 142 | EXPORT_SYMBOL(__clear_user); |