aboutsummaryrefslogtreecommitdiffstats
path: root/arch/blackfin/include/asm/string.h
blob: d7f0ccb418c347e5d9bb7e15f2c0a131d9c1d5b7 (plain) (blame)
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
/*
 * Copyright 2004-2008 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef _BLACKFIN_STRING_H_
#define _BLACKFIN_STRING_H_

#include <linux/types.h>

#ifdef __KERNEL__		/* only set these up for kernel code */

#define __HAVE_ARCH_STRCPY
extern inline char *strcpy(char *dest, const char *src)
{
	char *xdest = dest;
	char temp = 0;

	__asm__ __volatile__ (
		"1:"
		"%2 = B [%1++] (Z);"
		"B [%0++] = %2;"
		"CC = %2;"
		"if cc jump 1b (bp);"
		: "+&a" (dest), "+&a" (src), "=&d" (temp)
		:
		: "memory", "CC");

	return xdest;
}

#define __HAVE_ARCH_STRNCPY
extern inline char *strncpy(char *dest, const char *src, size_t n)
{
	char *xdest = dest;
	char temp = 0;

	if (n == 0)
		return xdest;

	__asm__ __volatile__ (
		"1:"
		"%3 = B [%1++] (Z);"
		"B [%0++] = %3;"
		"CC = %3;"
		"if ! cc jump 2f;"
		"%2 += -1;"
		"CC = %2 == 0;"
		"if ! cc jump 1b (bp);"
		"jump 4f;"
		"2:"
		/* if src is shorter than n, we need to null pad bytes now */
		"%3 = 0;"
		"3:"
		"%2 += -1;"
		"CC = %2 == 0;"
		"if cc jump 4f;"
		"B [%0++] = %3;"
		"jump 3b;"
		"4:"
		: "+&a" (dest), "+&a" (src), "+&da" (n), "=&d" (temp)
		:
		: "memory", "CC");

	return xdest;
}

#define __HAVE_ARCH_STRCMP
extern inline int strcmp(const char *cs, const char *ct)
{
	/* need to use int's here so the char's in the assembly don't get
	 * sign extended incorrectly when we don't want them to be
	 */
	int __res1, __res2;

	__asm__ __volatile__ (
		"1:"
		"%2 = B[%0++] (Z);"      /* get *cs */
		"%3 = B[%1++] (Z);"      /* get *ct */
		"CC = %2 == %3;"         /* compare a byte */
		"if ! cc jump 2f;"       /* not equal, break out */
		"CC = %2;"               /* at end of cs? */
		"if cc jump 1b (bp);"    /* no, keep going */
		"jump.s 3f;"             /* strings are equal */
		"2:"
		"%2 = %2 - %3;"          /* *cs - *ct */
		"3:"
		: "+&a" (cs), "+&a" (ct), "=&d" (__res1), "=&d" (__res2)
		:
		: "memory", "CC");

	return __res1;
}

#define __HAVE_ARCH_STRNCMP
extern inline int strncmp(const char *cs, const char *ct, size_t count)
{
	/* need to use int's here so the char's in the assembly don't get
	 * sign extended incorrectly when we don't want them to be
	 */
	int __res1, __res2;

	if (!count)
		return 0;

	__asm__ __volatile__ (
		"1:"
		"%3 = B[%0++] (Z);"      /* get *cs */
		"%4 = B[%1++] (Z);"      /* get *ct */
		"CC = %3 == %4;"         /* compare a byte */
		"if ! cc jump 3f;"       /* not equal, break out */
		"CC = %3;"               /* at end of cs? */
		"if ! cc jump 4f;"       /* yes, all done */
		"%2 += -1;"              /* no, adjust count */
		"CC = %2 == 0;"
		"if ! cc jump 1b;"       /* more to do, keep going */
		"2:"
		"%3 = 0;"                /* strings are equal */
		"jump.s 4f;"
		"3:"
		"%3 = %3 - %4;"          /* *cs - *ct */
		"4:"
		: "+&a" (cs), "+&a" (ct), "+&da" (count), "=&d" (__res1), "=&d" (__res2)
		:
		: "memory", "CC");

	return __res1;
}

#define __HAVE_ARCH_MEMSET
extern void *memset(void *s, int c, size_t count);
#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *d, const void *s, size_t count);
#define __HAVE_ARCH_MEMCMP
extern int memcmp(const void *, const void *, __kernel_size_t);
#define	__HAVE_ARCH_MEMCHR
extern void *memchr(const void *s, int c, size_t n);
#define	__HAVE_ARCH_MEMMOVE
extern void *memmove(void *dest, const void *src, size_t count);

#endif /*__KERNEL__*/
#endif				/* _BLACKFIN_STRING_H_ */