2 * linux/arch/arm/lib/putuser.S
4 * Copyright (C) 2001 Russell King
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.
10 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
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.
18 * Inputs: r0 contains the address
19 * r1 contains the address limit, which must be preserved
20 * r2, r3 contains the value
21 * Outputs: r0 is the error code
24 * No other registers must be altered. (see <asm/uaccess.h>
25 * for specific ASM register usage).
27 * Note that ADDR_LIMIT is either 0 or 0xc0000000
28 * Note also that it is intended that __put_user_bad is not global.
30 #include <linux/linkage.h>
31 #include <asm/assembler.h>
32 #include <asm/errno.h>
33 #include <asm/domain.h>
34 #include <asm/export.h>
37 check_uaccess r0, 1, r1, ip, __put_user_bad
38 1: TUSER(strb) r2, [r0]
42 EXPORT_SYMBOL(__put_user_1)
45 check_uaccess r0, 2, r1, ip, __put_user_bad
47 #ifdef CONFIG_THUMB2_KERNEL
49 2: TUSER(strb) r2, [r0]
50 3: TUSER(strb) ip, [r0, #1]
52 2: TUSER(strb) ip, [r0]
53 3: TUSER(strb) r2, [r0, #1]
55 #else /* !CONFIG_THUMB2_KERNEL */
57 2: TUSER(strb) r2, [r0], #1
58 3: TUSER(strb) ip, [r0]
60 2: TUSER(strb) ip, [r0], #1
61 3: TUSER(strb) r2, [r0]
63 #endif /* CONFIG_THUMB2_KERNEL */
67 EXPORT_SYMBOL(__put_user_2)
70 check_uaccess r0, 4, r1, ip, __put_user_bad
71 4: TUSER(str) r2, [r0]
75 EXPORT_SYMBOL(__put_user_4)
78 check_uaccess r0, 8, r1, ip, __put_user_bad
79 #ifdef CONFIG_THUMB2_KERNEL
80 5: TUSER(str) r2, [r0]
81 6: TUSER(str) r3, [r0, #4]
83 5: TUSER(str) r2, [r0], #4
84 6: TUSER(str) r3, [r0]
89 EXPORT_SYMBOL(__put_user_8)
94 ENDPROC(__put_user_bad)
96 .pushsection __ex_table, "a"
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