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TOMOYO Linux Cross Reference
Linux/arch/m68k/lib/memcpy.c

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  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 #include <linux/module.h>
  8 #include <linux/string.h>
  9 
 10 void *memcpy(void *to, const void *from, size_t n)
 11 {
 12         void *xto = to;
 13         size_t temp;
 14 
 15         if (!n)
 16                 return xto;
 17         if ((long)to & 1) {
 18                 char *cto = to;
 19                 const char *cfrom = from;
 20                 *cto++ = *cfrom++;
 21                 to = cto;
 22                 from = cfrom;
 23                 n--;
 24         }
 25 #if defined(CONFIG_M68000)
 26         if ((long)from & 1) {
 27                 char *cto = to;
 28                 const char *cfrom = from;
 29                 for (; n; n--)
 30                         *cto++ = *cfrom++;
 31                 return xto;
 32         }
 33 #endif
 34         if (n > 2 && (long)to & 2) {
 35                 short *sto = to;
 36                 const short *sfrom = from;
 37                 *sto++ = *sfrom++;
 38                 to = sto;
 39                 from = sfrom;
 40                 n -= 2;
 41         }
 42         temp = n >> 2;
 43         if (temp) {
 44                 long *lto = to;
 45                 const long *lfrom = from;
 46 #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
 47                 for (; temp; temp--)
 48                         *lto++ = *lfrom++;
 49 #else
 50                 size_t temp1;
 51                 asm volatile (
 52                         "       movel %2,%3\n"
 53                         "       andw  #7,%3\n"
 54                         "       lsrl  #3,%2\n"
 55                         "       negw  %3\n"
 56                         "       jmp   %%pc@(1f,%3:w:2)\n"
 57                         "4:     movel %0@+,%1@+\n"
 58                         "       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                         "1:     dbra  %2,4b\n"
 66                         "       clrw  %2\n"
 67                         "       subql #1,%2\n"
 68                         "       jpl   4b"
 69                         : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
 70                         : "" (lfrom), "1" (lto), "2" (temp));
 71 #endif
 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);
 90 

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