ldnoexec: Add script to remove ET_EXEC flag from intermediate build objects

Add a script to remove the ET_EXEC flag from the 16bit and "32bit
segmented" intermediate objects.  This avoids build failures with some
linkers that will not allow linking these objects again.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 32 insertions, 0 deletions

diff --git a/scripts/ldnoexec.py b/scripts/ldnoexec.py
new file mode 100755
index 0000000..60bed07
--- /dev/null
+++ b/scripts/ldnoexec.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# Script to remove EXEC flag from an ELF file
+#
+# Copyright (C) 2020  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import optparse
+
+FLAG_OFFSET = 16
+
+def main():
+    # Parse command-line arguments
+    usage = "%prog <input_file> <output_file>"
+    opts = optparse.OptionParser(usage)
+    options, args = opts.parse_args()
+    if len(args) != 2:
+        opts.error("Incorrect number of arguments")
+    infilename, outfilename = args
+    # Read input
+    f = open(infilename, "rb")
+    srcdata = f.read()
+    f.close()
+    # Update
+    outdata = bytearray(srcdata)
+    outdata[FLAG_OFFSET] = 0x01 # change ET_EXEC to ET_REL
+    # Write output
+    f = open(outfilename, "wb")
+    f.write(outdata)
+    f.close()
+
+if __name__ == '__main__':
+    main()