arch/m68k/lib/string.c

   1
   2 #include <linux/types.h>
   3 #include <linux/module.h>
   4
   5 void *memset(void *s, int c, size_t count)
   6 {
   7         void *xs = s;
   8         size_t temp, temp1;
   9
  10         if (!count)
  11                 return xs;
  12         c &= 0xff;
  13         c |= c << 8;
  14         c |= c << 16;
  15         if ((long)s & 1) {
  16                 char *cs = s;
  17                 *cs++ = c;
  18                 s = cs;
  19                 count--;
  20         }
  21         if (count > 2 && (long)s & 2) {
  22                 short *ss = s;
  23                 *ss++ = c;
  24                 s = ss;
  25                 count -= 2;
  26         }
  27         temp = count >> 2;
  28         if (temp) {
  29                 long *ls = s;
  30
  31                 asm volatile (
  32                         "       movel %1,%2\n"
  33                         "       andw  #7,%2\n"
  34                         "       lsrl  #3,%1\n"
  35                         "       negw  %2\n"
  36                         "       jmp   %%pc@(2f,%2:w:2)\n"
  37                         "1:     movel %3,%0@+\n"
  38                         "       movel %3,%0@+\n"
  39                         "       movel %3,%0@+\n"
  40                         "       movel %3,%0@+\n"
  41                         "       movel %3,%0@+\n"
  42                         "       movel %3,%0@+\n"
  43                         "       movel %3,%0@+\n"
  44                         "       movel %3,%0@+\n"
  45                         "2:     dbra  %1,1b\n"
  46                         "       clrw  %1\n"
  47                         "       subql #1,%1\n"
  48                         "       jpl   1b"
  49                         : "=a" (ls), "=d" (temp), "=&d" (temp1)
  50                         : "d" (c), "0" (ls), "1" (temp));
  51                 s = ls;
  52         }
  53         if (count & 2) {
  54                 short *ss = s;
  55                 *ss++ = c;
  56                 s = ss;
  57         }
  58         if (count & 1) {
  59                 char *cs = s;
  60                 *cs = c;
  61         }
  62         return xs;
  63 }
  64 EXPORT_SYMBOL(memset);
  65
  66 void *memcpy(void *to, const void *from, size_t n)
  67 {
  68         void *xto = to;
  69         size_t temp, temp1;
  70
  71         if (!n)
  72                 return xto;
  73         if ((long)to & 1) {
  74                 char *cto = to;
  75                 const char *cfrom = from;
  76                 *cto++ = *cfrom++;
  77                 to = cto;
  78                 from = cfrom;
  79                 n--;
  80         }
  81         if (n > 2 && (long)to & 2) {
  82                 short *sto = to;
  83                 const short *sfrom = from;
  84                 *sto++ = *sfrom++;
  85                 to = sto;
  86                 from = sfrom;
  87                 n -= 2;
  88         }
  89         temp = n >> 2;
  90         if (temp) {
  91                 long *lto = to;
  92                 const long *lfrom = from;
  93
  94                 asm volatile (
  95                         "       movel %2,%3\n"
  96                         "       andw  #7,%3\n"
  97                         "       lsrl  #3,%2\n"
  98                         "       negw  %3\n"
  99                         "       jmp   %%pc@(1f,%3:w:2)\n"
 100                         "4:     movel %0@+,%1@+\n"
 101                         "       movel %0@+,%1@+\n"
 102                         "       movel %0@+,%1@+\n"
 103                         "       movel %0@+,%1@+\n"
 104                         "       movel %0@+,%1@+\n"
 105                         "       movel %0@+,%1@+\n"
 106                         "       movel %0@+,%1@+\n"
 107                         "       movel %0@+,%1@+\n"
 108                         "1:     dbra  %2,4b\n"
 109                         "       clrw  %2\n"
 110                         "       subql #1,%2\n"
 111                         "       jpl   4b"
 112                         : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
 113                         : "0" (lfrom), "1" (lto), "2" (temp));
 114                 to = lto;
 115                 from = lfrom;
 116         }
 117         if (n & 2) {
 118                 short *sto = to;
 119                 const short *sfrom = from;
 120                 *sto++ = *sfrom++;
 121                 to = sto;
 122                 from = sfrom;
 123         }
 124         if (n & 1) {
 125                 char *cto = to;
 126                 const char *cfrom = from;
 127                 *cto = *cfrom;
 128         }
 129         return xto;
 130 }
 131 EXPORT_SYMBOL(memcpy);
 132
 133 void *memmove(void *dest, const void *src, size_t n)
 134 {
 135         void *xdest = dest;
 136         size_t temp;
 137
 138         if (!n)
 139                 return xdest;
 140
 141         if (dest < src) {
 142                 if ((long)dest & 1) {
 143                         char *cdest = dest;
 144                         const char *csrc = src;
 145                         *cdest++ = *csrc++;
 146                         dest = cdest;
 147                         src = csrc;
 148                         n--;
 149                 }
 150                 if (n > 2 && (long)dest & 2) {
 151                         short *sdest = dest;
 152                         const short *ssrc = src;
 153                         *sdest++ = *ssrc++;
 154                         dest = sdest;
 155                         src = ssrc;
 156                         n -= 2;
 157                 }
 158                 temp = n >> 2;
 159                 if (temp) {
 160                         long *ldest = dest;
 161                         const long *lsrc = src;
 162                         temp--;
 163                         do
 164                                 *ldest++ = *lsrc++;
 165                         while (temp--);
 166                         dest = ldest;
 167                         src = lsrc;
 168                 }
 169                 if (n & 2) {
 170                         short *sdest = dest;
 171                         const short *ssrc = src;
 172                         *sdest++ = *ssrc++;
 173                         dest = sdest;
 174                         src = ssrc;
 175                 }
 176                 if (n & 1) {
 177                         char *cdest = dest;
 178                         const char *csrc = src;
 179                         *cdest = *csrc;
 180                 }
 181         } else {
 182                 dest = (char *)dest + n;
 183                 src = (const char *)src + n;
 184                 if ((long)dest & 1) {
 185                         char *cdest = dest;
 186                         const char *csrc = src;
 187                         *--cdest = *--csrc;
 188                         dest = cdest;
 189                         src = csrc;
 190                         n--;
 191                 }
 192                 if (n > 2 && (long)dest & 2) {
 193                         short *sdest = dest;
 194                         const short *ssrc = src;
 195                         *--sdest = *--ssrc;
 196                         dest = sdest;
 197                         src = ssrc;
 198                         n -= 2;
 199                 }
 200                 temp = n >> 2;
 201                 if (temp) {
 202                         long *ldest = dest;
 203                         const long *lsrc = src;
 204                         temp--;
 205                         do
 206                                 *--ldest = *--lsrc;
 207                         while (temp--);
 208                         dest = ldest;
 209                         src = lsrc;
 210                 }
 211                 if (n & 2) {
 212                         short *sdest = dest;
 213                         const short *ssrc = src;
 214                         *--sdest = *--ssrc;
 215                         dest = sdest;
 216                         src = ssrc;
 217                 }
 218                 if (n & 1) {
 219                         char *cdest = dest;
 220                         const char *csrc = src;
 221                         *--cdest = *--csrc;
 222                 }
 223         }
 224         return xdest;
 225 }
 226 EXPORT_SYMBOL(memmove);
 227
 228 int memcmp(const void *cs, const void *ct, size_t count)
 229 {
 230         const unsigned char *su1, *su2;
 231
 232         for (su1 = cs, su2 = ct; count > 0; ++su1, ++su2, count--)
 233                 if (*su1 != *su2)
 234                         return *su1 < *su2 ? -1 : +1;
 235         return 0;
 236 }
 237 EXPORT_SYMBOL(memcmp);