[PATCH] mutex subsystem, add atomic_xchg() to all arches
[linux-2.6.git] / 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, 95, 96, 97, 98, 2000, 01 Ralf Baechle
7  * Copyright (c) 2000 by Silicon Graphics, Inc.
8  * Copyright (c) 2001 MIPS Technologies, Inc.
9  */
10 #ifndef _ASM_STRING_H
11 #define _ASM_STRING_H
12
13 #include <linux/config.h>
14
15 /*
16  * Most of the inline functions are rather naive implementations so I just
17  * didn't bother updating them for 64-bit ...
18  */
19 #ifdef CONFIG_32BIT
20
21 #ifndef IN_STRING_C
22
23 #define __HAVE_ARCH_STRCPY
24 static __inline__ char *strcpy(char *__dest, __const__ char *__src)
25 {
26   char *__xdest = __dest;
27
28   __asm__ __volatile__(
29         ".set\tnoreorder\n\t"
30         ".set\tnoat\n"
31         "1:\tlbu\t$1,(%1)\n\t"
32         "addiu\t%1,1\n\t"
33         "sb\t$1,(%0)\n\t"
34         "bnez\t$1,1b\n\t"
35         "addiu\t%0,1\n\t"
36         ".set\tat\n\t"
37         ".set\treorder"
38         : "=r" (__dest), "=r" (__src)
39         : "0" (__dest), "1" (__src)
40         : "memory");
41
42   return __xdest;
43 }
44
45 #define __HAVE_ARCH_STRNCPY
46 static __inline__ char *strncpy(char *__dest, __const__ char *__src, size_t __n)
47 {
48   char *__xdest = __dest;
49
50   if (__n == 0)
51     return __xdest;
52
53   __asm__ __volatile__(
54         ".set\tnoreorder\n\t"
55         ".set\tnoat\n"
56         "1:\tlbu\t$1,(%1)\n\t"
57         "subu\t%2,1\n\t"
58         "sb\t$1,(%0)\n\t"
59         "beqz\t$1,2f\n\t"
60         "addiu\t%0,1\n\t"
61         "bnez\t%2,1b\n\t"
62         "addiu\t%1,1\n"
63         "2:\n\t"
64         ".set\tat\n\t"
65         ".set\treorder"
66         : "=r" (__dest), "=r" (__src), "=r" (__n)
67         : "0" (__dest), "1" (__src), "2" (__n)
68         : "memory");
69
70   return __xdest;
71 }
72
73 #define __HAVE_ARCH_STRCMP
74 static __inline__ int strcmp(__const__ char *__cs, __const__ char *__ct)
75 {
76   int __res;
77
78   __asm__ __volatile__(
79         ".set\tnoreorder\n\t"
80         ".set\tnoat\n\t"
81         "lbu\t%2,(%0)\n"
82         "1:\tlbu\t$1,(%1)\n\t"
83         "addiu\t%0,1\n\t"
84         "bne\t$1,%2,2f\n\t"
85         "addiu\t%1,1\n\t"
86         "bnez\t%2,1b\n\t"
87         "lbu\t%2,(%0)\n\t"
88 #if defined(CONFIG_CPU_R3000)
89         "nop\n\t"
90 #endif
91         "move\t%2,$1\n"
92         "2:\tsubu\t%2,$1\n"
93         "3:\t.set\tat\n\t"
94         ".set\treorder"
95         : "=r" (__cs), "=r" (__ct), "=r" (__res)
96         : "0" (__cs), "1" (__ct));
97
98   return __res;
99 }
100
101 #endif /* !defined(IN_STRING_C) */
102
103 #define __HAVE_ARCH_STRNCMP
104 static __inline__ int
105 strncmp(__const__ char *__cs, __const__ char *__ct, size_t __count)
106 {
107         int __res;
108
109         __asm__ __volatile__(
110         ".set\tnoreorder\n\t"
111         ".set\tnoat\n"
112         "1:\tlbu\t%3,(%0)\n\t"
113         "beqz\t%2,2f\n\t"
114         "lbu\t$1,(%1)\n\t"
115         "subu\t%2,1\n\t"
116         "bne\t$1,%3,3f\n\t"
117         "addiu\t%0,1\n\t"
118         "bnez\t%3,1b\n\t"
119         "addiu\t%1,1\n"
120         "2:\n\t"
121 #if defined(CONFIG_CPU_R3000)
122         "nop\n\t"
123 #endif
124         "move\t%3,$1\n"
125         "3:\tsubu\t%3,$1\n\t"
126         ".set\tat\n\t"
127         ".set\treorder"
128         : "=r" (__cs), "=r" (__ct), "=r" (__count), "=r" (__res)
129         : "0" (__cs), "1" (__ct), "2" (__count));
130
131         return __res;
132 }
133 #endif /* CONFIG_32BIT */
134
135 #define __HAVE_ARCH_MEMSET
136 extern void *memset(void *__s, int __c, size_t __count);
137
138 #define __HAVE_ARCH_MEMCPY
139 extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
140
141 #define __HAVE_ARCH_MEMMOVE
142 extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
143
144 #ifdef CONFIG_32BIT
145 #define __HAVE_ARCH_MEMSCAN
146 static __inline__ void *memscan(void *__addr, int __c, size_t __size)
147 {
148         char *__end = (char *)__addr + __size;
149         unsigned char __uc = (unsigned char) __c;
150
151         __asm__(".set\tpush\n\t"
152                 ".set\tnoat\n\t"
153                 ".set\treorder\n\t"
154                 "1:\tbeq\t%0,%1,2f\n\t"
155                 "addiu\t%0,1\n\t"
156                 "lbu\t$1,-1(%0)\n\t"
157                 "bne\t$1,%z4,1b\n"
158                 "2:\t.set\tpop"
159                 : "=r" (__addr), "=r" (__end)
160                 : "0" (__addr), "1" (__end), "Jr" (__uc));
161
162         return __addr;
163 }
164 #endif /* CONFIG_32BIT */
165
166 #endif /* _ASM_STRING_H */