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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/getuser.S | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Idea from x86 version, (C) Copyright 1998 Linus Torvalds | |
11 | * | |
12 | * These functions have a non-standard call interface to make them more | |
13 | * efficient, especially as they return an error value in addition to | |
14 | * the "real" return value. | |
15 | * | |
16 | * __get_user_X | |
17 | * | |
18 | * Inputs: r0 contains the address | |
8404663f | 19 | * r1 contains the address limit, which must be preserved |
1da177e4 | 20 | * Outputs: r0 is the error code |
e38361d0 | 21 | * r2, r3 contains the zero-extended value |
1da177e4 LT |
22 | * lr corrupted |
23 | * | |
4baa9922 | 24 | * No other registers must be altered. (see <asm/uaccess.h> |
1da177e4 LT |
25 | * for specific ASM register usage). |
26 | * | |
27 | * Note that ADDR_LIMIT is either 0 or 0xc0000000. | |
28 | * Note also that it is intended that __get_user_bad is not global. | |
29 | */ | |
93ed3970 | 30 | #include <linux/linkage.h> |
8404663f | 31 | #include <asm/assembler.h> |
1da177e4 | 32 | #include <asm/errno.h> |
247055aa | 33 | #include <asm/domain.h> |
4dd1837d | 34 | #include <asm/export.h> |
1da177e4 | 35 | |
93ed3970 | 36 | ENTRY(__get_user_1) |
8404663f | 37 | check_uaccess r0, 1, r1, r2, __get_user_bad |
4e7682d0 | 38 | 1: TUSER(ldrb) r2, [r0] |
1da177e4 | 39 | mov r0, #0 |
6ebbf2ce | 40 | ret lr |
93ed3970 | 41 | ENDPROC(__get_user_1) |
4dd1837d | 42 | EXPORT_SYMBOL(__get_user_1) |
1da177e4 | 43 | |
93ed3970 | 44 | ENTRY(__get_user_2) |
8404663f RK |
45 | check_uaccess r0, 2, r1, r2, __get_user_bad |
46 | #ifdef CONFIG_CPU_USE_DOMAINS | |
47 | rb .req ip | |
48 | 2: ldrbt r2, [r0], #1 | |
49 | 3: ldrbt rb, [r0], #0 | |
8b592783 | 50 | #else |
8404663f RK |
51 | rb .req r0 |
52 | 2: ldrb r2, [r0] | |
53 | 3: ldrb rb, [r0, #1] | |
8b592783 | 54 | #endif |
1da177e4 | 55 | #ifndef __ARMEB__ |
8404663f | 56 | orr r2, r2, rb, lsl #8 |
1da177e4 | 57 | #else |
8404663f | 58 | orr r2, rb, r2, lsl #8 |
1da177e4 LT |
59 | #endif |
60 | mov r0, #0 | |
6ebbf2ce | 61 | ret lr |
93ed3970 | 62 | ENDPROC(__get_user_2) |
4dd1837d | 63 | EXPORT_SYMBOL(__get_user_2) |
1da177e4 | 64 | |
93ed3970 | 65 | ENTRY(__get_user_4) |
8404663f | 66 | check_uaccess r0, 4, r1, r2, __get_user_bad |
4e7682d0 | 67 | 4: TUSER(ldr) r2, [r0] |
1da177e4 | 68 | mov r0, #0 |
6ebbf2ce | 69 | ret lr |
93ed3970 | 70 | ENDPROC(__get_user_4) |
4dd1837d | 71 | EXPORT_SYMBOL(__get_user_4) |
1da177e4 | 72 | |
e38361d0 DT |
73 | ENTRY(__get_user_8) |
74 | check_uaccess r0, 8, r1, r2, __get_user_bad | |
75 | #ifdef CONFIG_THUMB2_KERNEL | |
76 | 5: TUSER(ldr) r2, [r0] | |
77 | 6: TUSER(ldr) r3, [r0, #4] | |
78 | #else | |
79 | 5: TUSER(ldr) r2, [r0], #4 | |
80 | 6: TUSER(ldr) r3, [r0] | |
81 | #endif | |
82 | mov r0, #0 | |
83 | ret lr | |
84 | ENDPROC(__get_user_8) | |
4dd1837d | 85 | EXPORT_SYMBOL(__get_user_8) |
e38361d0 DT |
86 | |
87 | #ifdef __ARMEB__ | |
d9981380 | 88 | ENTRY(__get_user_32t_8) |
e38361d0 DT |
89 | check_uaccess r0, 8, r1, r2, __get_user_bad |
90 | #ifdef CONFIG_CPU_USE_DOMAINS | |
91 | add r0, r0, #4 | |
92 | 7: ldrt r2, [r0] | |
93 | #else | |
94 | 7: ldr r2, [r0, #4] | |
95 | #endif | |
96 | mov r0, #0 | |
97 | ret lr | |
d9981380 | 98 | ENDPROC(__get_user_32t_8) |
4dd1837d | 99 | EXPORT_SYMBOL(__get_user_32t_8) |
d9981380 VK |
100 | |
101 | ENTRY(__get_user_64t_1) | |
102 | check_uaccess r0, 1, r1, r2, __get_user_bad8 | |
103 | 8: TUSER(ldrb) r3, [r0] | |
104 | mov r0, #0 | |
105 | ret lr | |
106 | ENDPROC(__get_user_64t_1) | |
4dd1837d | 107 | EXPORT_SYMBOL(__get_user_64t_1) |
d9981380 VK |
108 | |
109 | ENTRY(__get_user_64t_2) | |
110 | check_uaccess r0, 2, r1, r2, __get_user_bad8 | |
111 | #ifdef CONFIG_CPU_USE_DOMAINS | |
112 | rb .req ip | |
113 | 9: ldrbt r3, [r0], #1 | |
114 | 10: ldrbt rb, [r0], #0 | |
115 | #else | |
116 | rb .req r0 | |
117 | 9: ldrb r3, [r0] | |
118 | 10: ldrb rb, [r0, #1] | |
119 | #endif | |
120 | orr r3, rb, r3, lsl #8 | |
121 | mov r0, #0 | |
122 | ret lr | |
123 | ENDPROC(__get_user_64t_2) | |
4dd1837d | 124 | EXPORT_SYMBOL(__get_user_64t_2) |
d9981380 VK |
125 | |
126 | ENTRY(__get_user_64t_4) | |
127 | check_uaccess r0, 4, r1, r2, __get_user_bad8 | |
128 | 11: TUSER(ldr) r3, [r0] | |
129 | mov r0, #0 | |
130 | ret lr | |
131 | ENDPROC(__get_user_64t_4) | |
4dd1837d | 132 | EXPORT_SYMBOL(__get_user_64t_4) |
e38361d0 DT |
133 | #endif |
134 | ||
135 | __get_user_bad8: | |
136 | mov r3, #0 | |
1da177e4 LT |
137 | __get_user_bad: |
138 | mov r2, #0 | |
139 | mov r0, #-EFAULT | |
6ebbf2ce | 140 | ret lr |
93ed3970 | 141 | ENDPROC(__get_user_bad) |
e38361d0 | 142 | ENDPROC(__get_user_bad8) |
1da177e4 | 143 | |
4260415f | 144 | .pushsection __ex_table, "a" |
1da177e4 LT |
145 | .long 1b, __get_user_bad |
146 | .long 2b, __get_user_bad | |
147 | .long 3b, __get_user_bad | |
148 | .long 4b, __get_user_bad | |
e38361d0 DT |
149 | .long 5b, __get_user_bad8 |
150 | .long 6b, __get_user_bad8 | |
151 | #ifdef __ARMEB__ | |
152 | .long 7b, __get_user_bad | |
d9981380 VK |
153 | .long 8b, __get_user_bad8 |
154 | .long 9b, __get_user_bad8 | |
155 | .long 10b, __get_user_bad8 | |
156 | .long 11b, __get_user_bad8 | |
e38361d0 | 157 | #endif |
4260415f | 158 | .popsection |