1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 *  linux/arch/arm/lib/putuser.S
 4 *
 5 *  Copyright (C) 2001 Russell King
 6 *
 
 
 
 
 7 *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
 8 *
 9 * These functions have a non-standard call interface to make
10 * them more efficient, especially as they return an error
11 * value in addition to the "real" return value.
12 *
13 * __put_user_X
14 *
15 * Inputs:	r0 contains the address
16 *		r1 contains the address limit, which must be preserved
17 *		r2, r3 contains the value
18 * Outputs:	r0 is the error code
19 *		lr corrupted
20 *
21 * No other registers must be altered.  (see <asm/uaccess.h>
22 * for specific ASM register usage).
23 *
24 * Note that ADDR_LIMIT is either 0 or 0xc0000000
25 * Note also that it is intended that __put_user_bad is not global.
26 */
27#include <linux/linkage.h>
28#include <asm/assembler.h>
29#include <asm/errno.h>
30#include <asm/domain.h>
31
32ENTRY(__put_user_1)
33	check_uaccess r0, 1, r1, ip, __put_user_bad
341: TUSER(strb)	r2, [r0]
35	mov	r0, #0
36	ret	lr
37ENDPROC(__put_user_1)
38
39ENTRY(__put_user_2)
40	check_uaccess r0, 2, r1, ip, __put_user_bad
41#if __LINUX_ARM_ARCH__ >= 6
42
432: TUSER(strh)	r2, [r0]
44
45#else
46
47	mov	ip, r2, lsr #8
 
48#ifndef __ARMEB__
492: TUSER(strb)	r2, [r0], #1
503: TUSER(strb)	ip, [r0]
51#else
522: TUSER(strb)	ip, [r0], #1
533: TUSER(strb)	r2, [r0]
54#endif
55
56#endif /* __LINUX_ARM_ARCH__ >= 6 */
 
 
 
 
 
 
 
57	mov	r0, #0
58	ret	lr
59ENDPROC(__put_user_2)
60
61ENTRY(__put_user_4)
62	check_uaccess r0, 4, r1, ip, __put_user_bad
634: TUSER(str)	r2, [r0]
64	mov	r0, #0
65	ret	lr
66ENDPROC(__put_user_4)
67
68ENTRY(__put_user_8)
69	check_uaccess r0, 8, r1, ip, __put_user_bad
70#ifdef CONFIG_THUMB2_KERNEL
715: TUSER(str)	r2, [r0]
726: TUSER(str)	r3, [r0, #4]
73#else
745: TUSER(str)	r2, [r0], #4
756: TUSER(str)	r3, [r0]
76#endif
77	mov	r0, #0
78	ret	lr
79ENDPROC(__put_user_8)
80
81__put_user_bad:
82	mov	r0, #-EFAULT
83	ret	lr
84ENDPROC(__put_user_bad)
85
86.pushsection __ex_table, "a"
87	.long	1b, __put_user_bad
88	.long	2b, __put_user_bad
89#if __LINUX_ARM_ARCH__ < 6
90	.long	3b, __put_user_bad
91#endif
92	.long	4b, __put_user_bad
93	.long	5b, __put_user_bad
94	.long	6b, __put_user_bad
95.popsection

 
 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#include <asm/domain.h>
32
33ENTRY(__put_user_1)
341:	T(strb)	r2, [r0]
 
35	mov	r0, #0
36	mov	pc, lr
37ENDPROC(__put_user_1)
38
39ENTRY(__put_user_2)
 
 
 
 
 
 
 
40	mov	ip, r2, lsr #8
41#ifdef CONFIG_THUMB2_KERNEL
42#ifndef __ARMEB__
432:	T(strb)	r2, [r0]
443:	T(strb)	ip, [r0, #1]
45#else
462:	T(strb)	ip, [r0]
473:	T(strb)	r2, [r0, #1]
48#endif
49#else	/* !CONFIG_THUMB2_KERNEL */
50#ifndef __ARMEB__
512:	T(strb)	r2, [r0], #1
523:	T(strb)	ip, [r0]
53#else
542:	T(strb)	ip, [r0], #1
553:	T(strb)	r2, [r0]
56#endif
57#endif	/* CONFIG_THUMB2_KERNEL */
58	mov	r0, #0
59	mov	pc, lr
60ENDPROC(__put_user_2)
61
62ENTRY(__put_user_4)
634:	T(str)	r2, [r0]
 
64	mov	r0, #0
65	mov	pc, lr
66ENDPROC(__put_user_4)
67
68ENTRY(__put_user_8)
 
69#ifdef CONFIG_THUMB2_KERNEL
705:	T(str)	r2, [r0]
716:	T(str)	r3, [r0, #4]
72#else
735:	T(str)	r2, [r0], #4
746:	T(str)	r3, [r0]
75#endif
76	mov	r0, #0
77	mov	pc, lr
78ENDPROC(__put_user_8)
79
80__put_user_bad:
81	mov	r0, #-EFAULT
82	mov	pc, lr
83ENDPROC(__put_user_bad)
84
85.pushsection __ex_table, "a"
86	.long	1b, __put_user_bad
87	.long	2b, __put_user_bad
 
88	.long	3b, __put_user_bad
 
89	.long	4b, __put_user_bad
90	.long	5b, __put_user_bad
91	.long	6b, __put_user_bad
92.popsection