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| /*
| * 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);
|
|
