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_MIPS32
  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_MIPS32 */
 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_MIPS32
 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_MIPS32 */
 165
 166 #endif /* _ASM_STRING_H */