include/asm-mips/string.h

   1 /* $Id: string.h,v 1.6 1998/07/20 17:52:21 ralf 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 #define __HAVE_ARCH_STRCPY
  13 extern __inline__ char *strcpy(char *__dest, __const__ char *__src)
  14 {
  15   char *__xdest = __dest;
  16
  17   __asm__ __volatile__(
  18         ".set\tnoreorder\n\t"
  19         ".set\tnoat\n"
  20         "1:\tlbu\t$1,(%1)\n\t"
  21         "addiu\t%1,1\n\t"
  22         "sb\t$1,(%0)\n\t"
  23         "bnez\t$1,1b\n\t"
  24         "addiu\t%0,1\n\t"
  25         ".set\tat\n\t"
  26         ".set\treorder"
  27         : "=r" (__dest), "=r" (__src)
  28         : "0" (__dest), "1" (__src)
  29         : "$1","memory");
  30
  31   return __xdest;
  32 }
  33
  34 #define __HAVE_ARCH_STRNCPY
  35 extern __inline__ char *strncpy(char *__dest, __const__ char *__src, size_t __n)
  36 {
  37   char *__xdest = __dest;
  38
  39   if (__n == 0)
  40     return __xdest;
  41
  42   __asm__ __volatile__(
  43         ".set\tnoreorder\n\t"
  44         ".set\tnoat\n"
  45         "1:\tlbu\t$1,(%1)\n\t"
  46         "subu\t%2,1\n\t"
  47         "sb\t$1,(%0)\n\t"
  48         "beqz\t$1,2f\n\t"
  49         "addiu\t%0,1\n\t"
  50         "bnez\t%2,1b\n\t"
  51         "addiu\t%1,1\n"
  52         "2:\n\t"
  53         ".set\tat\n\t"
  54         ".set\treorder"
  55         : "=r" (__dest), "=r" (__src), "=r" (__n)
  56         : "0" (__dest), "1" (__src), "2" (__n)
  57         : "$1","memory");
  58
  59   return __dest;
  60 }
  61
  62 #define __HAVE_ARCH_STRCMP
  63 extern __inline__ int strcmp(__const__ char *__cs, __const__ char *__ct)
  64 {
  65   int __res;
  66
  67   __asm__ __volatile__(
  68         ".set\tnoreorder\n\t"
  69         ".set\tnoat\n\t"
  70         "lbu\t%2,(%0)\n"
  71         "1:\tlbu\t$1,(%1)\n\t"
  72         "addiu\t%0,1\n\t"
  73         "bne\t$1,%2,2f\n\t"
  74         "addiu\t%1,1\n\t"
  75         "bnez\t%2,1b\n\t"
  76         "lbu\t%2,(%0)\n\t"
  77 #if _MIPS_ISA == _MIPS_ISA_MIPS1
  78         "nop\n\t"
  79 #endif
  80         "move\t%2,$1\n"
  81         "2:\tsubu\t%2,$1\n"
  82         "3:\t.set\tat\n\t"
  83         ".set\treorder"
  84         : "=r" (__cs), "=r" (__ct), "=r" (__res)
  85         : "0" (__cs), "1" (__ct)
  86         : "$1");
  87
  88   return __res;
  89 }
  90
  91 #define __HAVE_ARCH_STRNCMP
  92 extern __inline__ int strncmp(__const__ char *__cs, __const__ char *__ct, size_t __count)
  93 {
  94   int __res;
  95
  96   __asm__ __volatile__(
  97         ".set\tnoreorder\n\t"
  98         ".set\tnoat\n"
  99         "1:\tlbu\t%3,(%1)\n\t"
 100         "beqz\t%2,2f\n\t"
 101         "lbu\t$1,(%0)\n\t"
 102         "addiu\t%1,1\n\t"
 103         "subu\t%3,$1,%3\n\t"
 104         "bnez\t%3,2f\n\t"
 105         "addiu\t%0,1\n\t"
 106         "bnez\t%1,1b\n"
 107         "addiu\t%2,-1\n"
 108         "2:\n\t"
 109         ".set\tat\n\t"
 110         ".set\treorder"
 111         : "=r" (__cs), "=r" (__ct), "=r" (__count), "=r" (__res)
 112         : "0" (__cs), "1" (__ct), "2" (__count)
 113         : "$1");
 114
 115   return __res;
 116 }
 117
 118 #define __HAVE_ARCH_MEMSET
 119 extern void *memset(void *__s, int __c, size_t __count);
 120
 121 #define __HAVE_ARCH_MEMCPY
 122 extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
 123
 124 #define __HAVE_ARCH_MEMMOVE
 125 extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
 126
 127 /* Don't build bcopy at all ...  */
 128 #define __HAVE_ARCH_BCOPY
 129
 130 #define __HAVE_ARCH_MEMSCAN
 131 extern __inline__ void *memscan(void *__addr, int __c, size_t __size)
 132 {
 133         char *__end = (char *)__addr + __size;
 134
 135         __asm__(".set\tpush\n\t"
 136                 ".set\tnoat\n\t"
 137                 ".set\treorder\n\t"
 138                 "1:\tbeq\t%0,%1,2f\n\t"
 139                 "addiu\t%0,1\n\t"
 140                 "lb\t$1,-1(%0)\n\t"
 141                 "bne\t$1,%4,1b\n"
 142                 "2:\t.set\tpop"
 143                 : "=r" (__addr), "=r" (__end)
 144                 : "0" (__addr), "1" (__end), "r" (__c)
 145                 : "$1");
 146
 147         return __addr;
 148 }
 149
 150 #endif /* __ASM_MIPS_STRING_H */