/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/string.h>

void *memcpy(void *to, const void *from, size_t n)
{
        void *xto = to;
        size_t temp;

        if (!n)
                return xto;
        if ((long)to & 1) {
                char *cto = to;
                const char *cfrom = from;
                *cto++ = *cfrom++;
                to = cto;
                from = cfrom;
                n--;
        }
#if defined(CONFIG_M68000)
        if ((long)from & 1) {
                char *cto = to;
                const char *cfrom = from;
                for (; n; n--)
                        *cto++ = *cfrom++;
                return xto;
        }
#endif
        if (n > 2 && (long)to & 2) {
                short *sto = to;
                const short *sfrom = from;
                *sto++ = *sfrom++;
                to = sto;
                from = sfrom;
                n -= 2;
        }
        temp = n >> 2;
        if (temp) {
                long *lto = to;
                const long *lfrom = from;
#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
                for (; temp; temp--)
                        *lto++ = *lfrom++;
#else
                size_t temp1;
                asm volatile (
                        "       movel %2,%3\n"
                        "       andw  #7,%3\n"
                        "       lsrl  #3,%2\n"
                        "       negw  %3\n"
                        "       jmp   %%pc@(1f,%3:w:2)\n"
                        "4:     movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "       movel %0@+,%1@+\n"
                        "1:     dbra  %2,4b\n"
                        "       clrw  %2\n"
                        "       subql #1,%2\n"
                        "       jpl   4b"
                        : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
                        : "0" (lfrom), "1" (lto), "2" (temp));
#endif
                to = lto;
                from = lfrom;
        }
        if (n & 2) {
                short *sto = to;
                const short *sfrom = from;
                *sto++ = *sfrom++;
                to = sto;
                from = sfrom;
        }
        if (n & 1) {
                char *cto = to;
                const char *cfrom = from;
                *cto = *cfrom;
        }
        return xto;
}
EXPORT_SYMBOL(memcpy);