summaryrefslogtreecommitdiff
path: root/arch/powerpc/lib/mem_64.S
blob: 3c3be02f33b7cb12bf14e7bbe5b554b1967c1eb9 (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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/*
 * String handling functions for PowerPC.
 *
 * Copyright (C) 1996 Paul Mackerras.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <asm/processor.h>
#include <asm/errno.h>
#include <asm/ppc_asm.h>
#include <asm/export.h>

_GLOBAL(__memset16)
	rlwimi	r4,r4,16,0,15
	/* fall through */

_GLOBAL(__memset32)
	rldimi	r4,r4,32,0
	/* fall through */

_GLOBAL(__memset64)
	neg	r0,r3
	andi.	r0,r0,7
	cmplw	cr1,r5,r0
	b	.Lms
EXPORT_SYMBOL(__memset16)
EXPORT_SYMBOL(__memset32)
EXPORT_SYMBOL(__memset64)

_GLOBAL(memset)
	neg	r0,r3
	rlwimi	r4,r4,8,16,23
	andi.	r0,r0,7			/* # bytes to be 8-byte aligned */
	rlwimi	r4,r4,16,0,15
	cmplw	cr1,r5,r0		/* do we get that far? */
	rldimi	r4,r4,32,0
.Lms:	PPC_MTOCRF(1,r0)
	mr	r6,r3
	blt	cr1,8f
	beq	3f			/* if already 8-byte aligned */
	subf	r5,r0,r5
	bf	31,1f
	stb	r4,0(r6)
	addi	r6,r6,1
1:	bf	30,2f
	sth	r4,0(r6)
	addi	r6,r6,2
2:	bf	29,3f
	stw	r4,0(r6)
	addi	r6,r6,4
3:	srdi.	r0,r5,6
	clrldi	r5,r5,58
	mtctr	r0
	beq	5f
	.balign 16
4:	std	r4,0(r6)
	std	r4,8(r6)
	std	r4,16(r6)
	std	r4,24(r6)
	std	r4,32(r6)
	std	r4,40(r6)
	std	r4,48(r6)
	std	r4,56(r6)
	addi	r6,r6,64
	bdnz	4b
5:	srwi.	r0,r5,3
	clrlwi	r5,r5,29
	PPC_MTOCRF(1,r0)
	beq	8f
	bf	29,6f
	std	r4,0(r6)
	std	r4,8(r6)
	std	r4,16(r6)
	std	r4,24(r6)
	addi	r6,r6,32
6:	bf	30,7f
	std	r4,0(r6)
	std	r4,8(r6)
	addi	r6,r6,16
7:	bf	31,8f
	std	r4,0(r6)
	addi	r6,r6,8
8:	cmpwi	r5,0
	PPC_MTOCRF(1,r5)
	beqlr
	bf	29,9f
	stw	r4,0(r6)
	addi	r6,r6,4
9:	bf	30,10f
	sth	r4,0(r6)
	addi	r6,r6,2
10:	bflr	31
	stb	r4,0(r6)
	blr
EXPORT_SYMBOL(memset)

_GLOBAL_TOC(memmove)
	cmplw	0,r3,r4
	bgt	backwards_memcpy
	b	memcpy

_GLOBAL(backwards_memcpy)
	rlwinm.	r7,r5,32-3,3,31		/* r0 = r5 >> 3 */
	add	r6,r3,r5
	add	r4,r4,r5
	beq	2f
	andi.	r0,r6,3
	mtctr	r7
	bne	5f
	.balign 16
1:	lwz	r7,-4(r4)
	lwzu	r8,-8(r4)
	stw	r7,-4(r6)
	stwu	r8,-8(r6)
	bdnz	1b
	andi.	r5,r5,7
2:	cmplwi	0,r5,4
	blt	3f
	lwzu	r0,-4(r4)
	subi	r5,r5,4
	stwu	r0,-4(r6)
3:	cmpwi	0,r5,0
	beqlr
	mtctr	r5
4:	lbzu	r0,-1(r4)
	stbu	r0,-1(r6)
	bdnz	4b
	blr
5:	mtctr	r0
6:	lbzu	r7,-1(r4)
	stbu	r7,-1(r6)
	bdnz	6b
	subf	r5,r0,r5
	rlwinm.	r7,r5,32-3,3,31
	beq	2b
	mtctr	r7
	b	1b
EXPORT_SYMBOL(memmove)