Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/lib/io-readsl.S
26295 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
/*

3
 *  linux/arch/arm/lib/io-readsl.S

4
 *

5
 *  Copyright (C) 1995-2000 Russell King

6
 */

7
#include <linux/linkage.h>

8
#include <asm/assembler.h>

9


10
ENTRY(__raw_readsl)

11
		teq	r2, #0		@ do we have to check for the zero len?

12
		reteq	lr

13
		ands	ip, r1, #3

14
		bne	3f

15


16
		subs	r2, r2, #4

17
		bmi	2f

18
		stmfd	sp!, {r4, lr}

19
1:		ldr	r3, [r0, #0]

20
		ldr	r4, [r0, #0]

21
		ldr	ip, [r0, #0]

22
		ldr	lr, [r0, #0]

23
		subs	r2, r2, #4

24
		stmia	r1!, {r3, r4, ip, lr}

25
		bpl	1b

26
		ldmfd	sp!, {r4, lr}

27
2:		movs	r2, r2, lsl #31

28
		ldrcs	r3, [r0, #0]

29
		ldrcs	ip, [r0, #0]

30
		stmiacs	r1!, {r3, ip}

31
		ldrne	r3, [r0, #0]

32
		strne	r3, [r1, #0]

33
		ret	lr

34


35
3:		ldr	r3, [r0]

36
		cmp	ip, #2

37
		mov	ip, r3, get_byte_0

38
		strb	ip, [r1], #1

39
		bgt	6f

40
		mov	ip, r3, get_byte_1

41
		strb	ip, [r1], #1

42
		beq	5f

43
		mov	ip, r3, get_byte_2

44
		strb	ip, [r1], #1

45


46
4:		subs	r2, r2, #1

47
		mov	ip, r3, lspull #24

48
		ldrne	r3, [r0]

49
		orrne	ip, ip, r3, lspush #8

50
		strne	ip, [r1], #4

51
		bne	4b

52
		b	8f

53


54
5:		subs	r2, r2, #1

55
		mov	ip, r3, lspull #16

56
		ldrne	r3, [r0]

57
		orrne	ip, ip, r3, lspush #16

58
		strne	ip, [r1], #4

59
		bne	5b

60
		b	7f

61


62
6:		subs	r2, r2, #1

63
		mov	ip, r3, lspull #8

64
		ldrne	r3, [r0]

65
		orrne	ip, ip, r3, lspush #24

66
		strne	ip, [r1], #4

67
		bne	6b

68


69
		mov	r3, ip, get_byte_2

70
		strb	r3, [r1, #2]

71
7:		mov	r3, ip, get_byte_1

72
		strb	r3, [r1, #1]

73
8:		mov	r3, ip, get_byte_0

74
		strb	r3, [r1, #0]

75
		ret	lr

76
ENDPROC(__raw_readsl)

77


78