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v3.1
 1/*
 2 *  linux/arch/arm/lib/getuser.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 them more
13 * efficient, especially as they return an error value in addition to
14 * the "real" return value.
15 *
16 * __get_user_X
17 *
18 * Inputs:	r0 contains the address
 
19 * Outputs:	r0 is the error code
20 *		r2, r3 contains the zero-extended value
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 __get_user_bad is not global.
28 */
29#include <linux/linkage.h>
 
30#include <asm/errno.h>
31#include <asm/domain.h>
32
33ENTRY(__get_user_1)
341:	T(ldrb)	r2, [r0]
 
35	mov	r0, #0
36	mov	pc, lr
37ENDPROC(__get_user_1)
38
39ENTRY(__get_user_2)
40#ifdef CONFIG_THUMB2_KERNEL
412:	T(ldrb)	r2, [r0]
423:	T(ldrb)	r3, [r0, #1]
 
 
43#else
442:	T(ldrb)	r2, [r0], #1
453:	T(ldrb)	r3, [r0]
 
46#endif
47#ifndef __ARMEB__
48	orr	r2, r2, r3, lsl #8
49#else
50	orr	r2, r3, r2, lsl #8
51#endif
52	mov	r0, #0
53	mov	pc, lr
54ENDPROC(__get_user_2)
55
56ENTRY(__get_user_4)
574:	T(ldr)	r2, [r0]
 
58	mov	r0, #0
59	mov	pc, lr
60ENDPROC(__get_user_4)
61
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
62__get_user_bad:
63	mov	r2, #0
64	mov	r0, #-EFAULT
65	mov	pc, lr
66ENDPROC(__get_user_bad)
 
67
68.pushsection __ex_table, "a"
69	.long	1b, __get_user_bad
70	.long	2b, __get_user_bad
71	.long	3b, __get_user_bad
72	.long	4b, __get_user_bad
 
 
 
 
 
 
 
 
 
73.popsection
v4.6
  1/*
  2 *  linux/arch/arm/lib/getuser.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 them more
 13 * efficient, especially as they return an error value in addition to
 14 * the "real" return value.
 15 *
 16 * __get_user_X
 17 *
 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
 22 *		lr corrupted
 23 *
 24 * No other registers must be altered.  (see <asm/uaccess.h>
 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 __get_user_bad is not global.
 29 */
 30#include <linux/linkage.h>
 31#include <asm/assembler.h>
 32#include <asm/errno.h>
 33#include <asm/domain.h>
 34
 35ENTRY(__get_user_1)
 36	check_uaccess r0, 1, r1, r2, __get_user_bad
 371: TUSER(ldrb)	r2, [r0]
 38	mov	r0, #0
 39	ret	lr
 40ENDPROC(__get_user_1)
 41
 42ENTRY(__get_user_2)
 43	check_uaccess r0, 2, r1, r2, __get_user_bad
 44#ifdef CONFIG_CPU_USE_DOMAINS
 45rb	.req	ip
 462:	ldrbt	r2, [r0], #1
 473:	ldrbt	rb, [r0], #0
 48#else
 49rb	.req	r0
 502:	ldrb	r2, [r0]
 513:	ldrb	rb, [r0, #1]
 52#endif
 53#ifndef __ARMEB__
 54	orr	r2, r2, rb, lsl #8
 55#else
 56	orr	r2, rb, r2, lsl #8
 57#endif
 58	mov	r0, #0
 59	ret	lr
 60ENDPROC(__get_user_2)
 61
 62ENTRY(__get_user_4)
 63	check_uaccess r0, 4, r1, r2, __get_user_bad
 644: TUSER(ldr)	r2, [r0]
 65	mov	r0, #0
 66	ret	lr
 67ENDPROC(__get_user_4)
 68
 69ENTRY(__get_user_8)
 70	check_uaccess r0, 8, r1, r2, __get_user_bad
 71#ifdef CONFIG_THUMB2_KERNEL
 725: TUSER(ldr)	r2, [r0]
 736: TUSER(ldr)	r3, [r0, #4]
 74#else
 755: TUSER(ldr)	r2, [r0], #4
 766: TUSER(ldr)	r3, [r0]
 77#endif
 78	mov	r0, #0
 79	ret	lr
 80ENDPROC(__get_user_8)
 81
 82#ifdef __ARMEB__
 83ENTRY(__get_user_32t_8)
 84	check_uaccess r0, 8, r1, r2, __get_user_bad
 85#ifdef CONFIG_CPU_USE_DOMAINS
 86	add	r0, r0, #4
 877:	ldrt	r2, [r0]
 88#else
 897:	ldr	r2, [r0, #4]
 90#endif
 91	mov	r0, #0
 92	ret	lr
 93ENDPROC(__get_user_32t_8)
 94
 95ENTRY(__get_user_64t_1)
 96	check_uaccess r0, 1, r1, r2, __get_user_bad8
 978: TUSER(ldrb)	r3, [r0]
 98	mov	r0, #0
 99	ret	lr
100ENDPROC(__get_user_64t_1)
101
102ENTRY(__get_user_64t_2)
103	check_uaccess r0, 2, r1, r2, __get_user_bad8
104#ifdef CONFIG_CPU_USE_DOMAINS
105rb	.req	ip
1069:	ldrbt	r3, [r0], #1
10710:	ldrbt	rb, [r0], #0
108#else
109rb	.req	r0
1109:	ldrb	r3, [r0]
11110:	ldrb	rb, [r0, #1]
112#endif
113	orr	r3, rb, r3, lsl #8
114	mov	r0, #0
115	ret	lr
116ENDPROC(__get_user_64t_2)
117
118ENTRY(__get_user_64t_4)
119	check_uaccess r0, 4, r1, r2, __get_user_bad8
12011: TUSER(ldr)	r3, [r0]
121	mov	r0, #0
122	ret	lr
123ENDPROC(__get_user_64t_4)
124#endif
125
126__get_user_bad8:
127	mov	r3, #0
128__get_user_bad:
129	mov	r2, #0
130	mov	r0, #-EFAULT
131	ret	lr
132ENDPROC(__get_user_bad)
133ENDPROC(__get_user_bad8)
134
135.pushsection __ex_table, "a"
136	.long	1b, __get_user_bad
137	.long	2b, __get_user_bad
138	.long	3b, __get_user_bad
139	.long	4b, __get_user_bad
140	.long	5b, __get_user_bad8
141	.long	6b, __get_user_bad8
142#ifdef __ARMEB__
143	.long   7b, __get_user_bad
144	.long	8b, __get_user_bad8
145	.long	9b, __get_user_bad8
146	.long	10b, __get_user_bad8
147	.long	11b, __get_user_bad8
148#endif
149.popsection