A disgusting Python kludge to convert from Atmel to GNU assembly syntax. If you are reading this I'm sorry. Only here as a reference.

gas.py

import sys
lines = open(sys.argv[1]).readlines()
double_if=False
print "#include <avr/io.h>"
print ".global encrypt"
print ".global decrypt"
for line in lines:
	if '.endmacro' in line:
		line = line.replace("endmacro", "endm")
	if '.db' in line:
		line = line.replace('.db','.byte')
	if '.equ' in line:
		line = line.replace('.equ','')
	if '#ifdef' in line:
		line = line.replace('#ifdef', '.ifdef')
	elif '#if defined' in line:
		line = line.replace('#if defined(', '.ifdef ')
		line = line.replace('&& defined(', '\n.ifdef ')
		line = line.replace(')','')
		double_if = True
	if '#ifndef' in line:
		line = line.replace('#ifndef', '.ifndef')
	if '#else' in line:
		line = line.replace('#else', '.else')
	if '#define' in line:
		# FIXME
		line = line.replace('#define ', '.set ').strip() + ", 1" 
	if '#endif' in line:
		line = line.replace('#endif', '.endif')
		if double_if:
			double_if = False
			print '.endif'
	if '.def' in line:
		bits = line.split(' ')
		line = "#define %s %s" % (bits[1].strip(), bits[3].strip())
	bits = line.split(':')
	line = line.replace('high(', 'hi8(pm(')
	line = line.replace('low(', 'lo8(pm(')
	if '<<' in line:
		# FIXME
		print "FIXME"
	print line.strip()