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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/putuser.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 | |
13 | * them more efficient, especially as they return an error | |
14 | * value in addition to the "real" return value. | |
15 | * | |
16 | * __put_user_X | |
17 | * | |
18 | * Inputs: r0 contains the address | |
8404663f | 19 | * r1 contains the address limit, which must be preserved |
1da177e4 LT |
20 | * r2, r3 contains the value |
21 | * Outputs: r0 is the error code | |
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 __put_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(__put_user_1) |
8404663f | 37 | check_uaccess r0, 1, r1, ip, __put_user_bad |
4e7682d0 | 38 | 1: TUSER(strb) r2, [r0] |
1da177e4 | 39 | mov r0, #0 |
6ebbf2ce | 40 | ret lr |
93ed3970 | 41 | ENDPROC(__put_user_1) |
4dd1837d | 42 | EXPORT_SYMBOL(__put_user_1) |
1da177e4 | 43 | |
93ed3970 | 44 | ENTRY(__put_user_2) |
8404663f | 45 | check_uaccess r0, 2, r1, ip, __put_user_bad |
1da177e4 | 46 | mov ip, r2, lsr #8 |
8b592783 CM |
47 | #ifdef CONFIG_THUMB2_KERNEL |
48 | #ifndef __ARMEB__ | |
4e7682d0 CM |
49 | 2: TUSER(strb) r2, [r0] |
50 | 3: TUSER(strb) ip, [r0, #1] | |
8b592783 | 51 | #else |
4e7682d0 CM |
52 | 2: TUSER(strb) ip, [r0] |
53 | 3: TUSER(strb) r2, [r0, #1] | |
8b592783 CM |
54 | #endif |
55 | #else /* !CONFIG_THUMB2_KERNEL */ | |
1da177e4 | 56 | #ifndef __ARMEB__ |
4e7682d0 CM |
57 | 2: TUSER(strb) r2, [r0], #1 |
58 | 3: TUSER(strb) ip, [r0] | |
1da177e4 | 59 | #else |
4e7682d0 CM |
60 | 2: TUSER(strb) ip, [r0], #1 |
61 | 3: TUSER(strb) r2, [r0] | |
1da177e4 | 62 | #endif |
8b592783 | 63 | #endif /* CONFIG_THUMB2_KERNEL */ |
1da177e4 | 64 | mov r0, #0 |
6ebbf2ce | 65 | ret lr |
93ed3970 | 66 | ENDPROC(__put_user_2) |
4dd1837d | 67 | EXPORT_SYMBOL(__put_user_2) |
1da177e4 | 68 | |
93ed3970 | 69 | ENTRY(__put_user_4) |
8404663f | 70 | check_uaccess r0, 4, r1, ip, __put_user_bad |
4e7682d0 | 71 | 4: TUSER(str) r2, [r0] |
1da177e4 | 72 | mov r0, #0 |
6ebbf2ce | 73 | ret lr |
93ed3970 | 74 | ENDPROC(__put_user_4) |
4dd1837d | 75 | EXPORT_SYMBOL(__put_user_4) |
1da177e4 | 76 | |
93ed3970 | 77 | ENTRY(__put_user_8) |
8404663f | 78 | check_uaccess r0, 8, r1, ip, __put_user_bad |
8b592783 | 79 | #ifdef CONFIG_THUMB2_KERNEL |
4e7682d0 CM |
80 | 5: TUSER(str) r2, [r0] |
81 | 6: TUSER(str) r3, [r0, #4] | |
8b592783 | 82 | #else |
4e7682d0 CM |
83 | 5: TUSER(str) r2, [r0], #4 |
84 | 6: TUSER(str) r3, [r0] | |
8b592783 | 85 | #endif |
1da177e4 | 86 | mov r0, #0 |
6ebbf2ce | 87 | ret lr |
93ed3970 | 88 | ENDPROC(__put_user_8) |
4dd1837d | 89 | EXPORT_SYMBOL(__put_user_8) |
1da177e4 LT |
90 | |
91 | __put_user_bad: | |
92 | mov r0, #-EFAULT | |
6ebbf2ce | 93 | ret lr |
93ed3970 | 94 | ENDPROC(__put_user_bad) |
1da177e4 | 95 | |
4260415f | 96 | .pushsection __ex_table, "a" |
1da177e4 LT |
97 | .long 1b, __put_user_bad |
98 | .long 2b, __put_user_bad | |
99 | .long 3b, __put_user_bad | |
100 | .long 4b, __put_user_bad | |
101 | .long 5b, __put_user_bad | |
102 | .long 6b, __put_user_bad | |
4260415f | 103 | .popsection |