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[avr-crypto-lib.git] / shabea / memxor.S

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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
+
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