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