include/asm-mips/string.h

   1 /* $Id: string.h,v 1.13 2000/02/19 14:12:14 harald Exp $
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (c) 1994, 1995, 1996, 1997, 1998 by Ralf Baechle
   8  */
   9 #ifndef __ASM_MIPS_STRING_H
  10 #define __ASM_MIPS_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 #undef __HAVE_ARCH_MEMSET
 126 extern void *memset(void *__s, int __c, size_t __count);
 127
 128 #undef __HAVE_ARCH_MEMCPY
 129 extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
 130
 131 #undef __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,%4,1b\n"
 149                 "2:\t.set\tpop"
 150                 : "=r" (__addr), "=r" (__end)
 151                 : "0" (__addr), "1" (__end), "r" (__c)
 152                 : "$1");
 153
 154         return __addr;
 155 }
 156
 157 #endif /* __ASM_MIPS_STRING_H */