/*
 * 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/uaccess.h>

unsigned long __generic_copy_from_user(void *to, const void __user *from,
                                       unsigned long n)
{
        unsigned long tmp, res;

        asm volatile ("\n"
                "       tst.l   %0\n"
                "       jeq     2f\n"
                "1:     "MOVES".l       (%1)+,%3\n"
                "       move.l  %3,(%2)+\n"
                "       subq.l  #1,%0\n"
                "       jne     1b\n"
                "2:     btst    #1,%5\n"
                "       jeq     4f\n"
                "3:     "MOVES".w       (%1)+,%3\n"
                "       move.w  %3,(%2)+\n"
                "4:     btst    #0,%5\n"
                "       jeq     6f\n"
                "5:     "MOVES".b       (%1)+,%3\n"
                "       move.b  %3,(%2)+\n"
                "6:\n"
                "       .section .fixup,\"ax\"\n"
                "       .even\n"
                "10:    lsl.l   #2,%0\n"
                "       btst    #1,%5\n"
                "       jeq     8f\n"
                "30:    addq.l  #2,%0\n"
                "8:     btst    #0,%5\n"
                "       jeq     6b\n"
                "50:    addq.l  #1,%0\n"
                "       jra     6b\n"
                "       .previous\n"
                "\n"
                "       .section __ex_table,\"a\"\n"
                "       .align  4\n"
                "       .long   1b,10b\n"
                "       .long   3b,30b\n"
                "       .long   5b,50b\n"
                "       .previous"
                : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
                : "0" (n / 4), "d" (n & 3));

        return res;
}
EXPORT_SYMBOL(__generic_copy_from_user);

unsigned long __generic_copy_to_user(void __user *to, const void *from,
                                     unsigned long n)
{
        unsigned long tmp, res;

        asm volatile ("\n"
                "       tst.l   %0\n"
                "       jeq     4f\n"
                "1:     move.l  (%1)+,%3\n"
                "2:     "MOVES".l       %3,(%2)+\n"
                "3:     subq.l  #1,%0\n"
                "       jne     1b\n"
                "4:     btst    #1,%5\n"
                "       jeq     6f\n"
                "       move.w  (%1)+,%3\n"
                "5:     "MOVES".w       %3,(%2)+\n"
                "6:     btst    #0,%5\n"
                "       jeq     8f\n"
                "       move.b  (%1)+,%3\n"
                "7:     "MOVES".b  %3,(%2)+\n"
                "8:\n"
                "       .section .fixup,\"ax\"\n"
                "       .even\n"
                "20:    lsl.l   #2,%0\n"
                "50:    add.l   %5,%0\n"
                "       jra     8b\n"
                "       .previous\n"
                "\n"
                "       .section __ex_table,\"a\"\n"
                "       .align  4\n"
                "       .long   2b,20b\n"
                "       .long   3b,20b\n"
                "       .long   5b,50b\n"
                "       .long   6b,50b\n"
                "       .long   7b,50b\n"
                "       .long   8b,50b\n"
                "       .previous"
                : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
                : "0" (n / 4), "d" (n & 3));

        return res;
}
EXPORT_SYMBOL(__generic_copy_to_user);

/*
 * Zero Userspace
 */

unsigned long __clear_user(void __user *to, unsigned long n)
{
        unsigned long res;

        asm volatile ("\n"
                "       tst.l   %0\n"
                "       jeq     3f\n"
                "1:     "MOVES".l       %2,(%1)+\n"
                "2:     subq.l  #1,%0\n"
                "       jne     1b\n"
                "3:     btst    #1,%4\n"
                "       jeq     5f\n"
                "4:     "MOVES".w       %2,(%1)+\n"
                "5:     btst    #0,%4\n"
                "       jeq     7f\n"
                "6:     "MOVES".b       %2,(%1)\n"
                "7:\n"
                "       .section .fixup,\"ax\"\n"
                "       .even\n"
                "10:    lsl.l   #2,%0\n"
                "40:    add.l   %4,%0\n"
                "       jra     7b\n"
                "       .previous\n"
                "\n"
                "       .section __ex_table,\"a\"\n"
                "       .align  4\n"
                "       .long   1b,10b\n"
                "       .long   2b,10b\n"
                "       .long   4b,40b\n"
                "       .long   5b,40b\n"
                "       .long   6b,40b\n"
                "       .long   7b,40b\n"
                "       .previous"
                : "=d" (res), "+a" (to)
                : "d" (0), "0" (n / 4), "d" (n & 3));

    return res;
}
EXPORT_SYMBOL(__clear_user);