aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/lib/string.S
blob: c80fb49ce607f6da3f195fa4263eabec35c03e66 (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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/*
 * 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>

	.section __ex_table,"a"
	PPC_LONG_ALIGN
	.text
	
_GLOBAL(strcpy)
	addi	r5,r3,-1
	addi	r4,r4,-1
1:	lbzu	r0,1(r4)
	cmpwi	0,r0,0
	stbu	r0,1(r5)
	bne	1b
	blr

/* This clears out any unused part of the destination buffer,
   just as the libc version does.  -- paulus */
_GLOBAL(strncpy)
	PPC_LCMPI 0,r5,0
	beqlr
	mtctr	r5
	addi	r6,r3,-1
	addi	r4,r4,-1
1:	lbzu	r0,1(r4)
	cmpwi	0,r0,0
	stbu	r0,1(r6)
	bdnzf	2,1b		/* dec ctr, branch if ctr != 0 && !cr0.eq */
	bnelr			/* if we didn't hit a null char, we're done */
	mfctr	r5
	PPC_LCMPI 0,r5,0	/* any space left in destination buffer? */
	beqlr			/* we know r0 == 0 here */
2:	stbu	r0,1(r6)	/* clear it out if so */
	bdnz	2b
	blr

_GLOBAL(strcat)
	addi	r5,r3,-1
	addi	r4,r4,-1
1:	lbzu	r0,1(r5)
	cmpwi	0,r0,0
	bne	1b
	addi	r5,r5,-1
1:	lbzu	r0,1(r4)
	cmpwi	0,r0,0
	stbu	r0,1(r5)
	bne	1b
	blr

_GLOBAL(strcmp)
	addi	r5,r3,-1
	addi	r4,r4,-1
1:	lbzu	r3,1(r5)
	cmpwi	1,r3,0
	lbzu	r0,1(r4)
	subf.	r3,r0,r3
	beqlr	1
	beq	1b
	blr

_GLOBAL(strncmp)
	PPC_LCMPI 0,r5,0
	beq-	2f
	mtctr	r5
	addi	r5,r3,-1
	addi	r4,r4,-1
1:	lbzu	r3,1(r5)
	cmpwi	1,r3,0
	lbzu	r0,1(r4)
	subf.	r3,r0,r3
	beqlr	1
	bdnzt	eq,1b
	blr
2:	li	r3,0
	blr

_GLOBAL(strlen)
	addi	r4,r3,-1
1:	lbzu	r0,1(r4)
	cmpwi	0,r0,0
	bne	1b
	subf	r3,r3,r4
	blr

#ifdef CONFIG_PPC32
_GLOBAL(memcmp)
	PPC_LCMPI 0,r5,0
	beq-	2f
	mtctr	r5
	addi	r6,r3,-1
	addi	r4,r4,-1
1:	lbzu	r3,1(r6)
	lbzu	r0,1(r4)
	subf.	r3,r0,r3
	bdnzt	2,1b
	blr
2:	li	r3,0
	blr
#endif

_GLOBAL(memchr)
	PPC_LCMPI 0,r5,0
	beq-	2f
	mtctr	r5
	addi	r3,r3,-1
1:	lbzu	r0,1(r3)
	cmpw	0,r0,r4
	bdnzf	2,1b
	beqlr
2:	li	r3,0
	blr

#ifdef CONFIG_PPC32
_GLOBAL(__clear_user)
	addi	r6,r3,-4
	li	r3,0
	li	r5,0
	cmplwi	0,r4,4
	blt	7f
	/* clear a single word */
11:	stwu	r5,4(r6)
	beqlr
	/* clear word sized chunks */
	andi.	r0,r6,3
	add	r4,r0,r4
	subf	r6,r0,r6
	srwi	r0,r4,2
	andi.	r4,r4,3
	mtctr	r0
	bdz	7f
1:	stwu	r5,4(r6)
	bdnz	1b
	/* clear byte sized chunks */
7:	cmpwi	0,r4,0
	beqlr
	mtctr	r4
	addi	r6,r6,3
8:	stbu	r5,1(r6)
	bdnz	8b
	blr
90:	mr	r3,r4
	blr
91:	mfctr	r3
	slwi	r3,r3,2
	add	r3,r3,r4
	blr
92:	mfctr	r3
	blr

	.section __ex_table,"a"
	PPC_LONG	11b,90b
	PPC_LONG	1b,91b
	PPC_LONG	8b,92b
	.text
#endif