arch/m68k/lib/string.c

   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
   7 #define __IN_STRING_C
   8
   9 #include <linux/module.h>
  10 #include <linux/string.h>
  11
  12 char *strcpy(char *dest, const char *src)
  13 {
  14         return __kernel_strcpy(dest, src);
  15 }
  16 EXPORT_SYMBOL(strcpy);
  17
  18 char *strcat(char *dest, const char *src)
  19 {
  20         return __kernel_strcpy(dest + __kernel_strlen(dest), src);
  21 }
  22 EXPORT_SYMBOL(strcat);
  23
  24 void *memcpy(void *to, const void *from, size_t n)
  25 {
  26         void *xto = to;
  27         size_t temp, temp1;
  28
  29         if (!n)
  30                 return xto;
  31         if ((long)to & 1) {
  32                 char *cto = to;
  33                 const char *cfrom = from;
  34                 *cto++ = *cfrom++;
  35                 to = cto;
  36                 from = cfrom;
  37                 n--;
  38         }
  39         if (n > 2 && (long)to & 2) {
  40                 short *sto = to;
  41                 const short *sfrom = from;
  42                 *sto++ = *sfrom++;
  43                 to = sto;
  44                 from = sfrom;
  45                 n -= 2;
  46         }
  47         temp = n >> 2;
  48         if (temp) {
  49                 long *lto = to;
  50                 const long *lfrom = from;
  51
  52                 asm volatile (
  53                         "       movel %2,%3\n"
  54                         "       andw  #7,%3\n"
  55                         "       lsrl  #3,%2\n"
  56                         "       negw  %3\n"
  57                         "       jmp   %%pc@(1f,%3:w:2)\n"
  58                         "4:     movel %0@+,%1@+\n"
  59                         "       movel %0@+,%1@+\n"
  60                         "       movel %0@+,%1@+\n"
  61                         "       movel %0@+,%1@+\n"
  62                         "       movel %0@+,%1@+\n"
  63                         "       movel %0@+,%1@+\n"
  64                         "       movel %0@+,%1@+\n"
  65                         "       movel %0@+,%1@+\n"
  66                         "1:     dbra  %2,4b\n"
  67                         "       clrw  %2\n"
  68                         "       subql #1,%2\n"
  69                         "       jpl   4b"
  70                         : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
  71                         : "0" (lfrom), "1" (lto), "2" (temp));
  72                 to = lto;
  73                 from = lfrom;
  74         }
  75         if (n & 2) {
  76                 short *sto = to;
  77                 const short *sfrom = from;
  78                 *sto++ = *sfrom++;
  79                 to = sto;
  80                 from = sfrom;
  81         }
  82         if (n & 1) {
  83                 char *cto = to;
  84                 const char *cfrom = from;
  85                 *cto = *cfrom;
  86         }
  87         return xto;
  88 }
  89 EXPORT_SYMBOL(memcpy);