From 1fe4406f374291ab2e86e95a97341fd9c475fcb8 Mon Sep 17 00:00:00 2001
From: Jun Wako <wakojun@gmail.com>
Date: Fri, 24 Apr 2015 16:26:14 +0900
Subject: Squashed 'tmk_core/' changes from 7967731..b9e0ea0

b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk'
7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5

git-subtree-dir: tmk_core
git-subtree-split: b9e0ea08cb940de20b3610ecdda18e9d8cd7c552
---
 tool/mbed/mbed-sdk/workspace_tools/patch.py | 50 +++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 tool/mbed/mbed-sdk/workspace_tools/patch.py

(limited to 'tool/mbed/mbed-sdk/workspace_tools/patch.py')

diff --git a/tool/mbed/mbed-sdk/workspace_tools/patch.py b/tool/mbed/mbed-sdk/workspace_tools/patch.py
new file mode 100644
index 0000000000..6fda63f3c3
--- /dev/null
+++ b/tool/mbed/mbed-sdk/workspace_tools/patch.py
@@ -0,0 +1,50 @@
+"""
+mbed SDK
+Copyright (c) 2011-2013 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.
+
+
+http://www.nxp.com/documents/user_manual/UM10360.pdf
+
+32.3.1.1 Criterion for Valid User Code
+The reserved Cortex-M3 exception vector location 7 (offset 0x1C in the vector table)
+should contain the 2's complement of the check-sum of table entries 0 through 6. This
+causes the checksum of the first 8 table entries to be 0. The boot loader code checksums
+the first 8 locations in sector 0 of the flash. If the result is 0, then execution control is
+transferred to the user code.
+"""
+from struct import unpack, pack
+
+
+def patch(bin_path):
+    with open(bin_path, 'r+b') as bin:
+        # Read entries 0 through 6 (Little Endian 32bits words)
+        vector = [unpack('<I', bin.read(4))[0] for _ in range(7)]
+
+        # location 7 (offset 0x1C in the vector table) should contain the 2's
+        # complement of the check-sum of table entries 0 through 6
+        bin.seek(0x1C)
+        bin.write(pack('<I', (~sum(vector) + 1) & 0xFFFFFFFF))
+
+
+def is_patched(bin_path):
+    with open(bin_path, 'rb') as bin:
+        # The checksum of the first 8 table entries should be 0
+        return (sum([unpack('<I', bin.read(4))[0] for _ in range(8)]) & 0xFFFFFFFF) == 0
+
+
+if __name__ == '__main__':
+    bin_path = "C:/Users/emimon01/releases/emilmont/build/test/LPC1768/ARM/MBED_A1/basic.bin"
+    patch(bin_path)
+    assert is_patched(bin_path), "The file is not patched"
-- 
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