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

  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_ASM_NOKPROBE(__get_user_1)
 42
 43ENTRY(__get_user_2)
 44	check_uaccess r0, 2, r1, r2, __get_user_bad
 45#ifdef CONFIG_CPU_USE_DOMAINS
 46rb	.req	ip
 472:	ldrbt	r2, [r0], #1
 483:	ldrbt	rb, [r0], #0
 49#else
 50rb	.req	r0
 512:	ldrb	r2, [r0]
 523:	ldrb	rb, [r0, #1]
 53#endif
 54#ifndef __ARMEB__
 55	orr	r2, r2, rb, lsl #8
 56#else
 57	orr	r2, rb, r2, lsl #8
 58#endif
 59	mov	r0, #0
 60	ret	lr
 61ENDPROC(__get_user_2)
 62_ASM_NOKPROBE(__get_user_2)
 63
 64ENTRY(__get_user_4)
 65	check_uaccess r0, 4, r1, r2, __get_user_bad
 664: TUSER(ldr)	r2, [r0]
 67	mov	r0, #0
 68	ret	lr
 69ENDPROC(__get_user_4)
 70_ASM_NOKPROBE(__get_user_4)
 71
 72ENTRY(__get_user_8)
 73	check_uaccess r0, 8, r1, r2, __get_user_bad8
 74#ifdef CONFIG_THUMB2_KERNEL
 755: TUSER(ldr)	r2, [r0]
 766: TUSER(ldr)	r3, [r0, #4]
 77#else
 785: TUSER(ldr)	r2, [r0], #4
 796: TUSER(ldr)	r3, [r0]
 80#endif
 81	mov	r0, #0
 82	ret	lr
 83ENDPROC(__get_user_8)
 84_ASM_NOKPROBE(__get_user_8)
 85
 86#ifdef __ARMEB__
 87ENTRY(__get_user_32t_8)
 88	check_uaccess r0, 8, r1, r2, __get_user_bad
 89#ifdef CONFIG_CPU_USE_DOMAINS
 90	add	r0, r0, #4
 917:	ldrt	r2, [r0]
 92#else
 937:	ldr	r2, [r0, #4]
 94#endif
 95	mov	r0, #0
 96	ret	lr
 97ENDPROC(__get_user_32t_8)
 98_ASM_NOKPROBE(__get_user_32t_8)
 99
100ENTRY(__get_user_64t_1)
101	check_uaccess r0, 1, r1, r2, __get_user_bad8
1028: TUSER(ldrb)	r3, [r0]
103	mov	r0, #0
104	ret	lr
105ENDPROC(__get_user_64t_1)
106_ASM_NOKPROBE(__get_user_64t_1)
107
108ENTRY(__get_user_64t_2)
109	check_uaccess r0, 2, r1, r2, __get_user_bad8
110#ifdef CONFIG_CPU_USE_DOMAINS
111rb	.req	ip
1129:	ldrbt	r3, [r0], #1
11310:	ldrbt	rb, [r0], #0
114#else
115rb	.req	r0
1169:	ldrb	r3, [r0]
11710:	ldrb	rb, [r0, #1]
118#endif
119	orr	r3, rb, r3, lsl #8
120	mov	r0, #0
121	ret	lr
122ENDPROC(__get_user_64t_2)
123_ASM_NOKPROBE(__get_user_64t_2)
124
125ENTRY(__get_user_64t_4)
126	check_uaccess r0, 4, r1, r2, __get_user_bad8
12711: TUSER(ldr)	r3, [r0]
128	mov	r0, #0
129	ret	lr
130ENDPROC(__get_user_64t_4)
131_ASM_NOKPROBE(__get_user_64t_4)
132#endif
133
134__get_user_bad8:
135	mov	r3, #0
136__get_user_bad:
137	mov	r2, #0
138	mov	r0, #-EFAULT
139	ret	lr
140ENDPROC(__get_user_bad)
141ENDPROC(__get_user_bad8)
142_ASM_NOKPROBE(__get_user_bad)
143_ASM_NOKPROBE(__get_user_bad8)
144
145.pushsection __ex_table, "a"
146	.long	1b, __get_user_bad
147	.long	2b, __get_user_bad
148	.long	3b, __get_user_bad
149	.long	4b, __get_user_bad
150	.long	5b, __get_user_bad8
151	.long	6b, __get_user_bad8
152#ifdef __ARMEB__
153	.long   7b, __get_user_bad
154	.long	8b, __get_user_bad8
155	.long	9b, __get_user_bad8
156	.long	10b, __get_user_bad8
157	.long	11b, __get_user_bad8
158#endif
159.popsection