Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright 2004-2008 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef _BLACKFIN_STRING_H_
8#define _BLACKFIN_STRING_H_
9
10#include <linux/types.h>
11
12#ifdef __KERNEL__ /* only set these up for kernel code */
13
14#define __HAVE_ARCH_STRCPY
15extern inline char *strcpy(char *dest, const char *src)
16{
17 char *xdest = dest;
18 char temp = 0;
19
20 __asm__ __volatile__ (
21 "1:"
22 "%2 = B [%1++] (Z);"
23 "B [%0++] = %2;"
24 "CC = %2;"
25 "if cc jump 1b (bp);"
26 : "+&a" (dest), "+&a" (src), "=&d" (temp)
27 :
28 : "memory", "CC");
29
30 return xdest;
31}
32
33#define __HAVE_ARCH_STRNCPY
34extern inline char *strncpy(char *dest, const char *src, size_t n)
35{
36 char *xdest = dest;
37 char temp = 0;
38
39 if (n == 0)
40 return xdest;
41
42 __asm__ __volatile__ (
43 "1:"
44 "%3 = B [%1++] (Z);"
45 "B [%0++] = %3;"
46 "CC = %3;"
47 "if ! cc jump 2f;"
48 "%2 += -1;"
49 "CC = %2 == 0;"
50 "if ! cc jump 1b (bp);"
51 "jump 4f;"
52 "2:"
53 /* if src is shorter than n, we need to null pad bytes now */
54 "%3 = 0;"
55 "3:"
56 "%2 += -1;"
57 "CC = %2 == 0;"
58 "if cc jump 4f;"
59 "B [%0++] = %3;"
60 "jump 3b;"
61 "4:"
62 : "+&a" (dest), "+&a" (src), "+&da" (n), "=&d" (temp)
63 :
64 : "memory", "CC");
65
66 return xdest;
67}
68
69#define __HAVE_ARCH_STRCMP
70extern inline int strcmp(const char *cs, const char *ct)
71{
72 /* need to use int's here so the char's in the assembly don't get
73 * sign extended incorrectly when we don't want them to be
74 */
75 int __res1, __res2;
76
77 __asm__ __volatile__ (
78 "1:"
79 "%2 = B[%0++] (Z);" /* get *cs */
80 "%3 = B[%1++] (Z);" /* get *ct */
81 "CC = %2 == %3;" /* compare a byte */
82 "if ! cc jump 2f;" /* not equal, break out */
83 "CC = %2;" /* at end of cs? */
84 "if cc jump 1b (bp);" /* no, keep going */
85 "jump.s 3f;" /* strings are equal */
86 "2:"
87 "%2 = %2 - %3;" /* *cs - *ct */
88 "3:"
89 : "+&a" (cs), "+&a" (ct), "=&d" (__res1), "=&d" (__res2)
90 :
91 : "memory", "CC");
92
93 return __res1;
94}
95
96#define __HAVE_ARCH_STRNCMP
97extern inline int strncmp(const char *cs, const char *ct, size_t count)
98{
99 /* need to use int's here so the char's in the assembly don't get
100 * sign extended incorrectly when we don't want them to be
101 */
102 int __res1, __res2;
103
104 if (!count)
105 return 0;
106
107 __asm__ __volatile__ (
108 "1:"
109 "%3 = B[%0++] (Z);" /* get *cs */
110 "%4 = B[%1++] (Z);" /* get *ct */
111 "CC = %3 == %4;" /* compare a byte */
112 "if ! cc jump 3f;" /* not equal, break out */
113 "CC = %3;" /* at end of cs? */
114 "if ! cc jump 4f;" /* yes, all done */
115 "%2 += -1;" /* no, adjust count */
116 "CC = %2 == 0;"
117 "if ! cc jump 1b;" /* more to do, keep going */
118 "2:"
119 "%3 = 0;" /* strings are equal */
120 "jump.s 4f;"
121 "3:"
122 "%3 = %3 - %4;" /* *cs - *ct */
123 "4:"
124 : "+&a" (cs), "+&a" (ct), "+&da" (count), "=&d" (__res1), "=&d" (__res2)
125 :
126 : "memory", "CC");
127
128 return __res1;
129}
130
131#define __HAVE_ARCH_MEMSET
132extern void *memset(void *s, int c, size_t count);
133#define __HAVE_ARCH_MEMCPY
134extern void *memcpy(void *d, const void *s, size_t count);
135#define __HAVE_ARCH_MEMCMP
136extern int memcmp(const void *, const void *, __kernel_size_t);
137#define __HAVE_ARCH_MEMCHR
138extern void *memchr(const void *s, int c, size_t n);
139#define __HAVE_ARCH_MEMMOVE
140extern void *memmove(void *dest, const void *src, size_t count);
141
142#endif /*__KERNEL__*/
143#endif /* _BLACKFIN_STRING_H_ */