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