Script to patch out anti-debugging checks in circled binary

circled.patch.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+## -*- coding: utf-8 -*-
+import argparse
+from   shutil   import copyfile
+
+base_addr = 0x8000
+patch_addr = 0xf984
+opcodes   = b"\x00\x00\xa0\xe3"    # mov r0, #0
+
+def main() -> None:
+    # Argument parsing
+    description = """
+    Remove anti-debugging check (LD_PRELOAD) in the binary circled.
+    """
+    parser = argparse.ArgumentParser(description=description,
+                                     formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument("circled_orig", help="name of input file (original circled binary)")
+    parser.add_argument("circled_patched", help="name of output file (patched circled binary)")
+    args = parser.parse_args()
+
+    # Make a copy of the original binary
+    copyfile(args.circled_orig, args.circled_patched)
+
+    # Replace '0xc7a0: bl #0xc6a4' with '0xc7a0: mov r0, #0'
+    with open(args.circled_patched, "rb+") as f:
+        f.seek(patch_addr-base_addr)
+        f.write(opcodes)
+    
+if __name__ == "__main__":
+    main()