git.oblomov.eu Git - linux-2.6/blob - 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 void *memset(void *s, int c, size_t count)
  19 {
  20         void *xs = s;
  21         size_t temp, temp1;
  22
  23         if (!count)
  24                 return xs;
  25         c &= 0xff;
  26         c |= c << 8;
  27         c |= c << 16;
  28         if ((long)s & 1) {
  29                 char *cs = s;
  30                 *cs++ = c;
  31                 s = cs;
  32                 count--;
  33         }
  34         if (count > 2 && (long)s & 2) {
  35                 short *ss = s;
  36                 *ss++ = c;
  37                 s = ss;
  38                 count -= 2;
  39         }
  40         temp = count >> 2;
  41         if (temp) {
  42                 long *ls = s;
  43
  44                 asm volatile (
  45                         "       movel %1,%2\n"
  46                         "       andw  #7,%2\n"
  47                         "       lsrl  #3,%1\n"
  48                         "       negw  %2\n"
  49                         "       jmp   %%pc@(2f,%2:w:2)\n"
  50                         "1:     movel %3,%0@+\n"
  51                         "       movel %3,%0@+\n"
  52                         "       movel %3,%0@+\n"
  53                         "       movel %3,%0@+\n"
  54                         "       movel %3,%0@+\n"
  55                         "       movel %3,%0@+\n"
  56                         "       movel %3,%0@+\n"
  57                         "       movel %3,%0@+\n"
  58                         "2:     dbra  %1,1b\n"
  59                         "       clrw  %1\n"
  60                         "       subql #1,%1\n"
  61                         "       jpl   1b"
  62                         : "=a" (ls), "=d" (temp), "=&d" (temp1)
  63                         : "d" (c), "0" (ls), "1" (temp));
  64                 s = ls;
  65         }
  66         if (count & 2) {
  67                 short *ss = s;
  68                 *ss++ = c;
  69                 s = ss;
  70         }
  71         if (count & 1) {
  72                 char *cs = s;
  73                 *cs = c;
  74         }
  75         return xs;
  76 }
  77 EXPORT_SYMBOL(memset);
  78
  79 void *memcpy(void *to, const void *from, size_t n)
  80 {
  81         void *xto = to;
  82         size_t temp, temp1;
  83
  84         if (!n)
  85                 return xto;
  86         if ((long)to & 1) {
  87                 char *cto = to;
  88                 const char *cfrom = from;
  89                 *cto++ = *cfrom++;
  90                 to = cto;
  91                 from = cfrom;
  92                 n--;
  93         }
  94         if (n > 2 && (long)to & 2) {
  95                 short *sto = to;
  96                 const short *sfrom = from;
  97                 *sto++ = *sfrom++;
  98                 to = sto;
  99                 from = sfrom;
 100                 n -= 2;
 101         }
 102         temp = n >> 2;
 103         if (temp) {
 104                 long *lto = to;
 105                 const long *lfrom = from;
 106
 107                 asm volatile (
 108                         "       movel %2,%3\n"
 109                         "       andw  #7,%3\n"
 110                         "       lsrl  #3,%2\n"
 111                         "       negw  %3\n"
 112                         "       jmp   %%pc@(1f,%3:w:2)\n"
 113                         "4:     movel %0@+,%1@+\n"
 114                         "       movel %0@+,%1@+\n"
 115                         "       movel %0@+,%1@+\n"
 116                         "       movel %0@+,%1@+\n"
 117                         "       movel %0@+,%1@+\n"
 118                         "       movel %0@+,%1@+\n"
 119                         "       movel %0@+,%1@+\n"
 120                         "       movel %0@+,%1@+\n"
 121                         "1:     dbra  %2,4b\n"
 122                         "       clrw  %2\n"
 123                         "       subql #1,%2\n"
 124                         "       jpl   4b"
 125                         : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
 126                         : "0" (lfrom), "1" (lto), "2" (temp));
 127                 to = lto;
 128                 from = lfrom;
 129         }
 130         if (n & 2) {
 131                 short *sto = to;
 132                 const short *sfrom = from;
 133                 *sto++ = *sfrom++;
 134                 to = sto;
 135                 from = sfrom;
 136         }
 137         if (n & 1) {
 138                 char *cto = to;
 139                 const char *cfrom = from;
 140                 *cto = *cfrom;
 141         }
 142         return xto;
 143 }
 144 EXPORT_SYMBOL(memcpy);
 145
 146 void *memmove(void *dest, const void *src, size_t n)
 147 {
 148         void *xdest = dest;
 149         size_t temp;
 150
 151         if (!n)
 152                 return xdest;
 153
 154         if (dest < src) {
 155                 if ((long)dest & 1) {
 156                         char *cdest = dest;
 157                         const char *csrc = src;
 158                         *cdest++ = *csrc++;
 159                         dest = cdest;
 160                         src = csrc;
 161                         n--;
 162                 }
 163                 if (n > 2 && (long)dest & 2) {
 164                         short *sdest = dest;
 165                         const short *ssrc = src;
 166                         *sdest++ = *ssrc++;
 167                         dest = sdest;
 168                         src = ssrc;
 169                         n -= 2;
 170                 }
 171                 temp = n >> 2;
 172                 if (temp) {
 173                         long *ldest = dest;
 174                         const long *lsrc = src;
 175                         temp--;
 176                         do
 177                                 *ldest++ = *lsrc++;
 178                         while (temp--);
 179                         dest = ldest;
 180                         src = lsrc;
 181                 }
 182                 if (n & 2) {
 183                         short *sdest = dest;
 184                         const short *ssrc = src;
 185                         *sdest++ = *ssrc++;
 186                         dest = sdest;
 187                         src = ssrc;
 188                 }
 189                 if (n & 1) {
 190                         char *cdest = dest;
 191                         const char *csrc = src;
 192                         *cdest = *csrc;
 193                 }
 194         } else {
 195                 dest = (char *)dest + n;
 196                 src = (const char *)src + n;
 197                 if ((long)dest & 1) {
 198                         char *cdest = dest;
 199                         const char *csrc = src;
 200                         *--cdest = *--csrc;
 201                         dest = cdest;
 202                         src = csrc;
 203                         n--;
 204                 }
 205                 if (n > 2 && (long)dest & 2) {
 206                         short *sdest = dest;
 207                         const short *ssrc = src;
 208                         *--sdest = *--ssrc;
 209                         dest = sdest;
 210                         src = ssrc;
 211                         n -= 2;
 212                 }
 213                 temp = n >> 2;
 214                 if (temp) {
 215                         long *ldest = dest;
 216                         const long *lsrc = src;
 217                         temp--;
 218                         do
 219                                 *--ldest = *--lsrc;
 220                         while (temp--);
 221                         dest = ldest;
 222                         src = lsrc;
 223                 }
 224                 if (n & 2) {
 225                         short *sdest = dest;
 226                         const short *ssrc = src;
 227                         *--sdest = *--ssrc;
 228                         dest = sdest;
 229                         src = ssrc;
 230                 }
 231                 if (n & 1) {
 232                         char *cdest = dest;
 233                         const char *csrc = src;
 234                         *--cdest = *--csrc;
 235                 }
 236         }
 237         return xdest;
 238 }
 239 EXPORT_SYMBOL(memmove);
 240
 241 int memcmp(const void *cs, const void *ct, size_t count)
 242 {
 243         const unsigned char *su1, *su2;
 244
 245         for (su1 = cs, su2 = ct; count > 0; ++su1, ++su2, count--)
 246                 if (*su1 != *su2)
 247                         return *su1 < *su2 ? -1 : +1;
 248         return 0;
 249 }
 250 EXPORT_SYMBOL(memcmp);