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| /* 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 | |