include/asm-mips/string.h

/* */
This source file includes following definitions.
strcpy
strncpy
strcmp
strncmp
memset
memcpy
memmove
memscan
   1 /*
   2  * include/asm-mips/string.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (c) 1994, 1995  Waldorf Electronics
   9  * written by Ralf Baechle
  10  */
  11 #ifndef __ASM_MIPS_STRING_H
  12 #define __ASM_MIPS_STRING_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,%2,1\n\t"
  49         "sb\t$1,(%0)\n\t"
  50         "beqz\t$1,2f\n\t"
  51         "addiu\t%0,%0,1\n\t"
  52         "bnez\t%2,1b\n\t"
  53         "addiu\t%1,%1,1\n"
  54         "2:\n\t"
  55         ".set\tat\n\t"
  56         ".set\treorder\n\t"
  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 #ifndef __R4000__
  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         : "=d" (cs), "=d" (ct), "=d" (__res)
  87         : "0" (cs), "1" (ct)
  88         : "$1");
  89 
  90   return __res;
  91 }
  92 
  93 #define __HAVE_ARCH_STRNCMP
  94 extern __inline__ int strncmp(const char * cs, const char * ct, size_t count)
     /*  */
  95 {
  96   char __res;
  97 
  98   __asm__ __volatile__(
  99         ".set\tnoreorder\n\t"
 100         ".set\tnoat\n"
 101         "1:\tlbu\t%3,(%0)\n\t"
 102         "beqz\t%2,2f\n\t"
 103         "lbu\t$1,(%1)\n\t"
 104         "subu\t%2,1\n\t"
 105         "bne\t$1,%3,3f\n\t"
 106         "addiu\t%0,1\n\t"
 107         "bnez\t%3,1b\n\t"
 108         "addiu\t%1,1\n"
 109         "2:\tmove\t%3,$1\n"
 110         "3:\tsubu\t%3,$1\n\t"
 111         ".set\tat\n\t"
 112         ".set\treorder"
 113         : "=d" (cs), "=d" (ct), "=d" (count), "=d" (__res)
 114         : "0" (cs), "1" (ct), "2" (count)
 115         : "$1");
 116 
 117   return __res;
 118 }
 119 
 120 #define __HAVE_ARCH_MEMSET
 121 extern __inline__ void * memset(void * s, int c, size_t count)
     /*  */
 122 {
 123   void *xs = s;
 124 
 125   if (!count)
 126     return xs;
 127   __asm__ __volatile__(
 128         ".set\tnoreorder\n"
 129         "1:\tsb\t%3,(%0)\n\t"
 130         "bne\t%0,%1,1b\n\t"
 131         "addiu\t%0,%0,1\n\t"
 132         ".set\treorder"
 133         : "=r" (s), "=r" (count)
 134         : "0" (s), "r" (c), "1" (s + count - 1)
 135         : "memory");
 136 
 137   return xs;
 138 }
 139 
 140 #define __HAVE_ARCH_MEMCPY
 141 extern __inline__ void * memcpy(void * to, const void * from, size_t n)
     /*  */
 142 {
 143   void *xto = to;
 144 
 145   if (!n)
 146     return xto;
 147   __asm__ __volatile__(
 148         ".set\tnoreorder\n\t"
 149         ".set\tnoat\n"
 150         "1:\tlbu\t$1,(%1)\n\t"
 151         "addiu\t%1,1\n\t"
 152         "sb\t$1,(%0)\n\t"
 153         "subu\t%2,1\n\t"
 154         "bnez\t%2,1b\n\t"
 155         "addiu\t%0,1\n\t"
 156         ".set\tat\n\t"
 157         ".set\treorder"
 158         : "=r" (to), "=r" (from), "=r" (n)
 159         : "0" (to), "1" (from), "2" (n)
 160         : "$1","memory" );
 161   return xto;
 162 }
 163 
 164 #define __HAVE_ARCH_MEMMOVE
 165 extern __inline__ void * memmove(void * dest,const void * src, size_t n)
     /*  */
 166 {
 167   void *xdest = dest;
 168 
 169   if (!n)
 170     return xdest;
 171 
 172   if (dest < src)
 173     __asm__ __volatile__(
 174         ".set\tnoreorder\n\t"
 175         ".set\tnoat\n"
 176         "1:\tlbu\t$1,(%1)\n\t"
 177         "addiu\t%1,1\n\t"
 178         "sb\t$1,(%0)\n\t"
 179         "subu\t%2,1\n\t"
 180         "bnez\t%2,1b\n\t"
 181         "addiu\t%0,1\n\t"
 182         ".set\tat\n\t"
 183         ".set\treorder"
 184         : "=r" (dest), "=r" (src), "=r" (n)
 185         : "0" (dest), "1" (src), "2" (n)
 186         : "$1","memory" );
 187   else
 188     __asm__ __volatile__(
 189         ".set\tnoreorder\n\t"
 190         ".set\tnoat\n"
 191         "1:\tlbu\t$1,-1(%1)\n\t"
 192         "subu\t%1,1\n\t"
 193         "sb\t$1,-1(%0)\n\t"
 194         "subu\t%2,1\n\t"
 195         "bnez\t%2,1b\n\t"
 196         "subu\t%0,1\n\t"
 197         ".set\tat\n\t"
 198         ".set\treorder"
 199         : "=r" (dest), "=r" (src), "=r" (n)
 200         : "0" (dest+n), "1" (src+n), "2" (n)
 201         : "$1","memory" );
 202   return xdest;
 203 }
 204 
 205 #define __HAVE_ARCH_MEMSCAN
 206 extern __inline__ void * memscan(void * addr, int c, size_t size)
     /*  */
 207 {
 208         if (!size)
 209                 return addr;
 210         __asm__(".set\tnoreorder\n\t"
 211                 ".set\tnoat\n"
 212                 "1:\tbeqz\t%1,2f\n\t"
 213                 "lbu\t$1,(%0)\n\t"
 214                 "subu\t%1,1\n\t"
 215                 "bnez\t%1,1b\n\t"
 216                 "addiu\t%0,1\n\t"
 217                 ".set\tat\n\t"
 218                 ".set\treorder\n"
 219                 "2:"
 220                 : "=r" (addr), "=r" (size)
 221                 : "0" (addr), "1" (size), "r" (c)
 222                 : "$1");
 223 
 224         return addr;
 225 }
 226 
 227 #endif /* __ASM_MIPS_STRING_H */
/* */
root/include/asm-mips/string.h

INCLUDED FROM

DEFINITIONS
