[Add] First commit

scripts/imgtool/assemble.py

@@ -0,0 +1,93 @@
+#! /usr/bin/env python3
+#
+# Copyright 2017 Linaro Limited
+# Copyright (c) 2017-2019, 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
+import macro_parser
+
+offset_re = re.compile(r"^\s*RE_([0-9A-Z_]+)_IMAGE_OFFSET\s*=\s*(.*)")
+size_re = re.compile(r"^\s*RE_([0-9A-Z_]+)_IMAGE_MAX_SIZE\s*=\s*(.*)")
+
+class Assembly():
+    def __init__(self, layout_path, output):
+        self.output = output
+        self.layout_path = layout_path
+        self.find_slots()
+        try:
+            os.unlink(output)
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                raise
+
+    def find_slots(self):
+        offsets = {}
+        sizes = {}
+
+        offsets = macro_parser.evaluate_macro(self.layout_path, offset_re, 1, 2)
+        sizes = macro_parser.evaluate_macro(self.layout_path, size_re, 1, 2)
+
+        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:
+            ofd.seek(0, os.SEEK_END)
+            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('-l', '--layout', required=True,
+            help='Location of the file that contains preprocessed macros')
+    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.layout, args.output)
+
+    output.add_image(args.secure, "SECURE")
+    output.add_image(args.non_secure, "NON_SECURE")
+
+if __name__ == '__main__':
+    main()