-/* memxor.S */
-/*
- This file is part of the AVR-Crypto-Lib.
- Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/*
- * File: memxor.S
- * Author: Daniel Otte
- * Date: 2008-08-07
- * License: GPLv3 or later
- * Description: memxor, XORing one block into another
- *
- */
-
-/*
- * void memxor(void* dest, const void* src, uint16_t n);
- */
- /*
- * param dest is passed in r24:r25
- * param src is passed in r22:r23
- * param n is passed in r20:r21
- */
-.global memxor
-memxor:
- movw r30, r24
- movw r26, r22
- movw r24, r20
- adiw r24, 0
- breq 2f
-1:
- ld r20, X+
- ld r21, Z
- eor r20, r21
- st Z+, r20
- sbiw r24, 1
- brne 1b
-2:
- ret
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