Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/lib/putuser.S
10817 views
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


33
ENTRY(__put_user_1)

34
1:	T(strb)	r2, [r0]

35
	mov	r0, #0

36
	mov	pc, lr

37
ENDPROC(__put_user_1)

38


39
ENTRY(__put_user_2)

40
	mov	ip, r2, lsr #8

41
#ifdef CONFIG_THUMB2_KERNEL

42
#ifndef __ARMEB__

43
2:	T(strb)	r2, [r0]

44
3:	T(strb)	ip, [r0, #1]

45
#else

46
2:	T(strb)	ip, [r0]

47
3:	T(strb)	r2, [r0, #1]

48
#endif

49
#else	/* !CONFIG_THUMB2_KERNEL */

50
#ifndef __ARMEB__

51
2:	T(strb)	r2, [r0], #1

52
3:	T(strb)	ip, [r0]

53
#else

54
2:	T(strb)	ip, [r0], #1

55
3:	T(strb)	r2, [r0]

56
#endif

57
#endif	/* CONFIG_THUMB2_KERNEL */

58
	mov	r0, #0

59
	mov	pc, lr

60
ENDPROC(__put_user_2)

61


62
ENTRY(__put_user_4)

63
4:	T(str)	r2, [r0]

64
	mov	r0, #0

65
	mov	pc, lr

66
ENDPROC(__put_user_4)

67


68
ENTRY(__put_user_8)

69
#ifdef CONFIG_THUMB2_KERNEL

70
5:	T(str)	r2, [r0]

71
6:	T(str)	r3, [r0, #4]

72
#else

73
5:	T(str)	r2, [r0], #4

74
6:	T(str)	r3, [r0]

75
#endif

76
	mov	r0, #0

77
	mov	pc, lr

78
ENDPROC(__put_user_8)

79


80
__put_user_bad:

81
	mov	r0, #-EFAULT

82
	mov	pc, lr

83
ENDPROC(__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

93


94