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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 <asm/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 */
29#include <linux/linkage.h>
30#include <asm/errno.h>
31
32ENTRY(__put_user_1)
331: strbt r2, [r0]
34 mov r0, #0
35 mov pc, lr
36ENDPROC(__put_user_1)
37
38ENTRY(__put_user_2)
39 mov ip, r2, lsr #8
40#ifdef CONFIG_THUMB2_KERNEL
41#ifndef __ARMEB__
422: strbt r2, [r0]
433: strbt ip, [r0, #1]
44#else
452: strbt ip, [r0]
463: strbt r2, [r0, #1]
47#endif
48#else /* !CONFIG_THUMB2_KERNEL */
49#ifndef __ARMEB__
502: strbt r2, [r0], #1
513: strbt ip, [r0]
52#else
532: strbt ip, [r0], #1
543: strbt r2, [r0]
55#endif
56#endif /* CONFIG_THUMB2_KERNEL */
57 mov r0, #0
58 mov pc, lr
59ENDPROC(__put_user_2)
60
61ENTRY(__put_user_4)
624: strt r2, [r0]
63 mov r0, #0
64 mov pc, lr
65ENDPROC(__put_user_4)
66
67ENTRY(__put_user_8)
68#ifdef CONFIG_THUMB2_KERNEL
695: strt r2, [r0]
706: strt r3, [r0, #4]
71#else
725: strt r2, [r0], #4
736: strt r3, [r0]
74#endif
75 mov r0, #0
76 mov pc, lr
77ENDPROC(__put_user_8)
78
79__put_user_bad:
80 mov r0, #-EFAULT
81 mov pc, lr
82ENDPROC(__put_user_bad)
83
84.section __ex_table, "a"
85 .long 1b, __put_user_bad
86 .long 2b, __put_user_bad
87 .long 3b, __put_user_bad
88 .long 4b, __put_user_bad
89 .long 5b, __put_user_bad
90 .long 6b, __put_user_bad
91.previous