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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 | |
19 | * r2, r3 contains the value | |
20 | * Outputs: r0 is the error code | |
21 | * lr corrupted | |
22 | * | |
23 | * No other registers must be altered. (see include/asm-arm/uaccess.h | |
24 | * for specific ASM register usage). | |
25 | * | |
26 | * Note that ADDR_LIMIT is either 0 or 0xc0000000 | |
27 | * Note also that it is intended that __put_user_bad is not global. | |
28 | */ | |
e6ae744d | 29 | #include <asm/asm-offsets.h> |
1da177e4 LT |
30 | #include <asm/thread_info.h> |
31 | #include <asm/errno.h> | |
32 | ||
33 | .global __put_user_1 | |
34 | __put_user_1: | |
35 | 1: strbt r2, [r0] | |
36 | mov r0, #0 | |
37 | mov pc, lr | |
38 | ||
39 | .global __put_user_2 | |
40 | __put_user_2: | |
41 | mov ip, r2, lsr #8 | |
42 | #ifndef __ARMEB__ | |
43 | 2: strbt r2, [r0], #1 | |
44 | 3: strbt ip, [r0] | |
45 | #else | |
46 | 2: strbt ip, [r0], #1 | |
47 | 3: strbt r2, [r0] | |
48 | #endif | |
49 | mov r0, #0 | |
50 | mov pc, lr | |
51 | ||
52 | .global __put_user_4 | |
53 | __put_user_4: | |
54 | 4: strt r2, [r0] | |
55 | mov r0, #0 | |
56 | mov pc, lr | |
57 | ||
58 | .global __put_user_8 | |
59 | __put_user_8: | |
60 | 5: strt r2, [r0], #4 | |
61 | 6: strt r3, [r0] | |
62 | mov r0, #0 | |
63 | mov pc, lr | |
64 | ||
65 | __put_user_bad: | |
66 | mov r0, #-EFAULT | |
67 | mov pc, lr | |
68 | ||
69 | .section __ex_table, "a" | |
70 | .long 1b, __put_user_bad | |
71 | .long 2b, __put_user_bad | |
72 | .long 3b, __put_user_bad | |
73 | .long 4b, __put_user_bad | |
74 | .long 5b, __put_user_bad | |
75 | .long 6b, __put_user_bad | |
76 | .previous |