--- /dev/null
+/* avr-asm-macros.S */
+/*
+ This file is part of the Crypto-avr-lib/microcrypt-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: avr-asm-macros.S
+ * Author: Daniel Otte
+ * Date: 2008-08-13
+ * License: GPLv3 or later
+ * Description: some macros which are quite usefull
+ *
+ */
+
+#include <avr/io.h>
+
+/*******************************************************************************
+* MACRO SECTION *
+*******************************************************************************/
+
+.macro push_ p1:req, p2:vararg
+ push \p1
+.ifnb \p2
+ push_ \p2
+.endif
+.endm
+
+.macro pop_ p1:req, p2:vararg
+ pop \p1
+.ifnb \p2
+ pop_ \p2
+.endif
+.endm
+
+.macro push_range from:req, to:req
+ push \from
+.if \to-\from
+ push_range "(\from+1)",\to
+.endif
+.endm
+
+.macro pop_range from:req, to:req
+ pop \to
+.if \to-\from
+ pop_range \from,"(\to-1)"
+.endif
+.endm
+
+.macro stack_alloc size:req, reg1=r30, reg2=r31
+ in r0, _SFR_IO_ADDR(SREG)
+ in \reg1, _SFR_IO_ADDR(SPL)
+ in \reg2, _SFR_IO_ADDR(SPH)
+ sbiw \reg1, \size
+ cli
+ out _SFR_IO_ADDR(SPH), \reg2
+ out _SFR_IO_ADDR(SPL), \reg1
+ out _SFR_IO_ADDR(SREG), r0
+.endm
+
+.macro stack_free size:req, reg1=r30, reg2=r31
+ in r0, _SFR_IO_ADDR(SREG)
+ in \reg1, _SFR_IO_ADDR(SPL)
+ in \reg2, _SFR_IO_ADDR(SPH)
+ adiw \reg1, \size
+ cli
+ out _SFR_IO_ADDR(SPH), \reg2
+ out _SFR_IO_ADDR(SPL), \reg1
+ out _SFR_IO_ADDR(SREG), r0
+.endm
+
+/*******************************************************************************
+* END of MACRO SECTION *
+*******************************************************************************/
+
+
+