summaryrefslogtreecommitdiff
path: root/arch/arm/lib/io-readsl.S
blob: 75a9121cb23f69f13d5cb1a389daa46d511c5ee3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/*
 *  linux/arch/arm/lib/io-readsl.S
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

ENTRY(__raw_readsl)
		teq	r2, #0		@ do we have to check for the zero len?
		moveq	pc, lr
		ands	ip, r1, #3
		bne	3f

		subs	r2, r2, #4
		bmi	2f
		stmfd	sp!, {r4, lr}
1:		ldr	r3, [r0, #0]
		ldr	r4, [r0, #0]
		ldr	ip, [r0, #0]
		ldr	lr, [r0, #0]
		subs	r2, r2, #4
		stmia	r1!, {r3, r4, ip, lr}
		bpl	1b
		ldmfd	sp!, {r4, lr}
2:		movs	r2, r2, lsl #31
		ldrcs	r3, [r0, #0]
		ldrcs	ip, [r0, #0]
		stmcsia	r1!, {r3, ip}
		ldrne	r3, [r0, #0]
		strne	r3, [r1, #0]
		mov	pc, lr

3:		ldr	r3, [r0]
		cmp	ip, #2
		mov	ip, r3, get_byte_0
		strb	ip, [r1], #1
		bgt	6f
		mov	ip, r3, get_byte_1
		strb	ip, [r1], #1
		beq	5f
		mov	ip, r3, get_byte_2
		strb	ip, [r1], #1

4:		subs	r2, r2, #1
		mov	ip, r3, pull #24
		ldrne	r3, [r0]
		orrne	ip, ip, r3, push #8
		strne	ip, [r1], #4
		bne	4b
		b	8f

5:		subs	r2, r2, #1
		mov	ip, r3, pull #16
		ldrne	r3, [r0]
		orrne	ip, ip, r3, push #16
		strne	ip, [r1], #4
		bne	5b
		b	7f

6:		subs	r2, r2, #1
		mov	ip, r3, pull #8
		ldrne	r3, [r0]
		orrne	ip, ip, r3, push #24
		strne	ip, [r1], #4
		bne	6b

		mov	r3, ip, get_byte_2
		strb	r3, [r1, #2]
7:		mov	r3, ip, get_byte_1
		strb	r3, [r1, #1]
8:		mov	r3, ip, get_byte_0
		strb	r3, [r1, #0]
		mov	pc, lr