ANDROID: GKI: Header generation fix and improvements

Remove dependency on kleaf intermediate abi_symbollist.raw
and use vendor symbol lists as dependencies for header
generation targets. This prevents the feature to break in
case kleaf path and/or sandboxes changes and rebuilds the
header files if any vendor symbol list changes.

Update the header generation script to process the symbol lists
before generating headers to make sure symbols are in byte order,
any symbol list marker, whitespaces and emptylines are removed
for kernel binary search API.

Bug: 232430739
Test: TH
Change-Id: Ib5783fb21543844dac7faf1fb0fcf3e7bd2bf608
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>

scripts/gen_gki_modules_headers.sh

@@ -19,6 +19,7 @@
 # Collect arguments from Makefile
 TARGET=$1
 SRCTREE=$2
+SYMBOL_LIST=$3
 
 set -e
 
@@ -47,8 +48,14 @@ generate_header() {
 		rm -f -- "${header_file}"
 	fi
 
-	# Find Maximum symbol name length if valid symbol_file exist
+	# If symbol_file exist preprocess it and find maximum name length
 	if [  -s "${symbol_file}" ]; then
+		# Remove White Spaces, empty lines and symbol list markers if any
+		sed -i '/^[[:space:]]*$/d; /^#/d; /\[abi_symbol_list\]/d' "${symbol_file}"
+
+		# Sort in byte order for kernel binary search at runtime
+		LC_ALL=C sort -o "${symbol_file}" "${symbol_file}"
+
 		# Trim white spaces & +1 for null termination
 		local max_name_len=$(awk '
 				{
@@ -88,13 +95,12 @@ generate_header() {
 }
 
 if [ "$(basename "${TARGET}")" = "gki_module_unprotected.h" ]; then
-	# Sorted list of vendor symbols
-	GKI_VENDOR_SYMBOLS="${OUT_DIR}/abi_symbollist.raw"
-
+	# Union of vendor symbol lists
+	GKI_VENDOR_SYMBOLS="${SYMBOL_LIST}"
 	generate_header "${TARGET}" "${GKI_VENDOR_SYMBOLS}" "unprotected"
 else
 	# Sorted list of exported symbols
-	GKI_EXPORTED_SYMBOLS="${SRCTREE}/android/abi_gki_protected_exports"
+	GKI_EXPORTED_SYMBOLS="${SYMBOL_LIST}"
 
 	generate_header "${TARGET}" "${GKI_EXPORTED_SYMBOLS}" "protected_exports"
 fi