File: /usr/src/linux/include/asm-mips/string.h
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 1994, 1995, 1996, 1997, 1998, 2001 Ralf Baechle
7 * Copyright (c) 2001 MIPS Technologies, Inc.
8 */
9 #ifndef __ASM_STRING_H
10 #define __ASM_STRING_H
11
12 #include <linux/config.h>
13
14 #define __HAVE_ARCH_STRCPY
15 extern __inline__ char *strcpy(char *__dest, __const__ char *__src)
16 {
17 char *__xdest = __dest;
18
19 __asm__ __volatile__(
20 ".set\tnoreorder\n\t"
21 ".set\tnoat\n"
22 "1:\tlbu\t$1,(%1)\n\t"
23 "addiu\t%1,1\n\t"
24 "sb\t$1,(%0)\n\t"
25 "bnez\t$1,1b\n\t"
26 "addiu\t%0,1\n\t"
27 ".set\tat\n\t"
28 ".set\treorder"
29 : "=r" (__dest), "=r" (__src)
30 : "0" (__dest), "1" (__src)
31 : "$1","memory");
32
33 return __xdest;
34 }
35
36 #define __HAVE_ARCH_STRNCPY
37 extern __inline__ char *strncpy(char *__dest, __const__ char *__src, size_t __n)
38 {
39 char *__xdest = __dest;
40
41 if (__n == 0)
42 return __xdest;
43
44 __asm__ __volatile__(
45 ".set\tnoreorder\n\t"
46 ".set\tnoat\n"
47 "1:\tlbu\t$1,(%1)\n\t"
48 "subu\t%2,1\n\t"
49 "sb\t$1,(%0)\n\t"
50 "beqz\t$1,2f\n\t"
51 "addiu\t%0,1\n\t"
52 "bnez\t%2,1b\n\t"
53 "addiu\t%1,1\n"
54 "2:\n\t"
55 ".set\tat\n\t"
56 ".set\treorder"
57 : "=r" (__dest), "=r" (__src), "=r" (__n)
58 : "0" (__dest), "1" (__src), "2" (__n)
59 : "$1","memory");
60
61 return __dest;
62 }
63
64 #define __HAVE_ARCH_STRCMP
65 extern __inline__ int strcmp(__const__ char *__cs, __const__ char *__ct)
66 {
67 int __res;
68
69 __asm__ __volatile__(
70 ".set\tnoreorder\n\t"
71 ".set\tnoat\n\t"
72 "lbu\t%2,(%0)\n"
73 "1:\tlbu\t$1,(%1)\n\t"
74 "addiu\t%0,1\n\t"
75 "bne\t$1,%2,2f\n\t"
76 "addiu\t%1,1\n\t"
77 "bnez\t%2,1b\n\t"
78 "lbu\t%2,(%0)\n\t"
79 #if defined(CONFIG_CPU_R3000)
80 "nop\n\t"
81 #endif
82 "move\t%2,$1\n"
83 "2:\tsubu\t%2,$1\n"
84 "3:\t.set\tat\n\t"
85 ".set\treorder"
86 : "=r" (__cs), "=r" (__ct), "=r" (__res)
87 : "0" (__cs), "1" (__ct)
88 : "$1");
89
90 return __res;
91 }
92
93 #define __HAVE_ARCH_STRNCMP
94 extern __inline__ int
95 strncmp(__const__ char *__cs, __const__ char *__ct, size_t __count)
96 {
97 int __res;
98
99 __asm__ __volatile__(
100 ".set\tnoreorder\n\t"
101 ".set\tnoat\n"
102 "1:\tlbu\t%3,(%0)\n\t"
103 "beqz\t%2,2f\n\t"
104 "lbu\t$1,(%1)\n\t"
105 "subu\t%2,1\n\t"
106 "bne\t$1,%3,3f\n\t"
107 "addiu\t%0,1\n\t"
108 "bnez\t%3,1b\n\t"
109 "addiu\t%1,1\n"
110 "2:\n\t"
111 #if defined(CONFIG_CPU_R3000)
112 "nop\n\t"
113 #endif
114 "move\t%3,$1\n"
115 "3:\tsubu\t%3,$1\n\t"
116 ".set\tat\n\t"
117 ".set\treorder"
118 : "=r" (__cs), "=r" (__ct), "=r" (__count), "=r" (__res)
119 : "0" (__cs), "1" (__ct), "2" (__count)
120 : "$1");
121
122 return __res;
123 }
124
125 #define __HAVE_ARCH_MEMSET
126 extern void *memset(void *__s, int __c, size_t __count);
127
128 #define __HAVE_ARCH_MEMCPY
129 extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
130
131 #define __HAVE_ARCH_MEMMOVE
132 extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
133
134 /* Don't build bcopy at all ... */
135 #define __HAVE_ARCH_BCOPY
136
137 #define __HAVE_ARCH_MEMSCAN
138 extern __inline__ void *memscan(void *__addr, int __c, size_t __size)
139 {
140 char *__end = (char *)__addr + __size;
141
142 __asm__(".set\tpush\n\t"
143 ".set\tnoat\n\t"
144 ".set\treorder\n\t"
145 "1:\tbeq\t%0,%1,2f\n\t"
146 "addiu\t%0,1\n\t"
147 "lb\t$1,-1(%0)\n\t"
148 "bne\t$1,%z4,1b\n"
149 "2:\t.set\tpop"
150 : "=r" (__addr), "=r" (__end)
151 : "0" (__addr), "1" (__end), "Jr" (__c)
152 : "$1");
153
154 return __addr;
155 }
156
157 #endif /* __ASM_STRING_H */
158