2 * linux/arch/arm/lib/getuser.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 them more
13 * efficient, especially as they return an error value in addition to
14 * the "real" return value.
18 * Inputs: r0 contains the address
19 * r1 contains the address limit, which must be preserved
20 * Outputs: r0 is the error code
21 * r2, r3 contains the zero-extended value
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 __get_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, r2, __get_user_bad
38 1: TUSER(ldrb) r2, [r0]
42 EXPORT_SYMBOL(__get_user_1)
45 check_uaccess r0, 2, r1, r2, __get_user_bad
46 #ifdef CONFIG_CPU_USE_DOMAINS
56 orr r2, r2, rb, lsl #8
58 orr r2, rb, r2, lsl #8
63 EXPORT_SYMBOL(__get_user_2)
66 check_uaccess r0, 4, r1, r2, __get_user_bad
67 4: TUSER(ldr) r2, [r0]
71 EXPORT_SYMBOL(__get_user_4)
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]
79 5: TUSER(ldr) r2, [r0], #4
80 6: TUSER(ldr) r3, [r0]
85 EXPORT_SYMBOL(__get_user_8)
88 ENTRY(__get_user_32t_8)
89 check_uaccess r0, 8, r1, r2, __get_user_bad
90 #ifdef CONFIG_CPU_USE_DOMAINS
98 ENDPROC(__get_user_32t_8)
99 EXPORT_SYMBOL(__get_user_32t_8)
101 ENTRY(__get_user_64t_1)
102 check_uaccess r0, 1, r1, r2, __get_user_bad8
103 8: TUSER(ldrb) r3, [r0]
106 ENDPROC(__get_user_64t_1)
107 EXPORT_SYMBOL(__get_user_64t_1)
109 ENTRY(__get_user_64t_2)
110 check_uaccess r0, 2, r1, r2, __get_user_bad8
111 #ifdef CONFIG_CPU_USE_DOMAINS
113 9: ldrbt r3, [r0], #1
114 10: ldrbt rb, [r0], #0
118 10: ldrb rb, [r0, #1]
120 orr r3, rb, r3, lsl #8
123 ENDPROC(__get_user_64t_2)
124 EXPORT_SYMBOL(__get_user_64t_2)
126 ENTRY(__get_user_64t_4)
127 check_uaccess r0, 4, r1, r2, __get_user_bad8
128 11: TUSER(ldr) r3, [r0]
131 ENDPROC(__get_user_64t_4)
132 EXPORT_SYMBOL(__get_user_64t_4)
141 ENDPROC(__get_user_bad)
142 ENDPROC(__get_user_bad8)
144 .pushsection __ex_table, "a"
145 .long 1b, __get_user_bad
146 .long 2b, __get_user_bad
147 .long 3b, __get_user_bad
148 .long 4b, __get_user_bad
149 .long 5b, __get_user_bad8
150 .long 6b, __get_user_bad8
152 .long 7b, __get_user_bad
153 .long 8b, __get_user_bad8
154 .long 9b, __get_user_bad8
155 .long 10b, __get_user_bad8
156 .long 11b, __get_user_bad8