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#! /usr/bin/env python3
#
# Copyright 2017 Linaro Limited
# Copyright (c) 2017-2018, Arm Limited.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Assemble multiple images into a single image that can be flashed on the device.
"""
import argparse
import errno
import io
import re
import os
import shutil
offset_re = re.compile(r"^#define ([0-9A-Z_]+)_IMAGE_OFFSET\s+((0x)?[0-9a-fA-F]+)")
size_re = re.compile(r"^#define ([0-9A-Z_]+)_IMAGE_MAX_SIZE\s+((0x)?[0-9a-fA-F]+)")
class Assembly():
def __init__(self, output):
self.find_slots()
try:
os.unlink(output)
except OSError as e:
if e.errno != errno.ENOENT:
raise
self.output = output
def find_slots(self):
offsets = {}
sizes = {}
scriptsDir = os.path.dirname(os.path.abspath(__file__))
path = '../../../../platform/ext/target/mps2/an521/partition/flash_layout.h'
configFile = os.path.join(scriptsDir, path)
with open(configFile, 'r') as fd:
for line in fd:
m = offset_re.match(line)
if m is not None:
offsets[m.group(1)] = int(m.group(2), 0)
m = size_re.match(line)
if m is not None:
sizes[m.group(1)] = int(m.group(2), 0)
if 'SECURE' not in offsets:
raise Exception("Image config does not have secure partition")
if 'NON_SECURE' not in offsets:
raise Exception("Image config does not have non-secure partition")
self.offsets = offsets
self.sizes = sizes
def add_image(self, source, partition):
with open(self.output, 'ab') as ofd:
pos = ofd.tell()
if pos > self.offsets[partition]:
raise Exception("Partitions not in order, unsupported")
if pos < self.offsets[partition]:
ofd.write(b'\xFF' * (self.offsets[partition] - pos))
statinfo = os.stat(source)
if statinfo.st_size > self.sizes[partition]:
raise Exception("Image {} is too large for partition".format(source))
with open(source, 'rb') as rfd:
shutil.copyfileobj(rfd, ofd, 0x10000)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-s', '--secure', required=True,
help='Unsigned secure image')
parser.add_argument('-n', '--non_secure',
help='Unsigned non-secure image')
parser.add_argument('-o', '--output', required=True,
help='Filename to write full image to')
args = parser.parse_args()
output = Assembly(args.output)
output.add_image(args.secure, "SECURE")
output.add_image(args.non_secure, "NON_SECURE")
if __name__ == '__main__':
main()
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