1 files changed, 78 insertions, 0 deletions
diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh
new file mode 100755
index 000000000..6abe14388
--- /dev/null
+++ b/scripts/syscalltbl.sh
@@ -0,0 +1,78 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Generate a syscall table header.
+#
+# Each line of the syscall table should have the following format:
+#
+# NR ABI NAME [NATIVE] [COMPAT]
+#
+# NR       syscall number
+# ABI      ABI name
+# NAME     syscall name
+# NATIVE   native entry point (optional)
+# COMPAT   compat entry point (optional)
+
+set -e
+
+usage() {
+	echo >&2 "usage: $0 [--abis ABIS] INFILE OUTFILE" >&2
+	echo >&2
+	echo >&2 "  INFILE    input syscall table"
+	echo >&2 "  OUTFILE   output header file"
+	echo >&2
+	echo >&2 "options:"
+	echo >&2 "  --abis ABIS        ABI(s) to handle (By default, all lines are handled)"
+	exit 1
+}
+
+# default unless specified by options
+abis=
+
+while [ $# -gt 0 ]
+do
+	case $1 in
+	--abis)
+		abis=$(echo "($2)" | tr ',' '|')
+		shift 2;;
+	-*)
+		echo "$1: unknown option" >&2
+		usage;;
+	*)
+		break;;
+	esac
+done
+
+if [ $# -ne 2 ]; then
+	usage
+fi
+
+infile="$1"
+outfile="$2"
+
+nxt=0
+
+grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
+
+	while read nr abi name native compat ; do
+
+		if [ $nxt -gt $nr ]; then
+			echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2
+			exit 1
+		fi
+
+		while [ $nxt -lt $nr ]; do
+			echo "__SYSCALL($nxt, sys_ni_syscall)"
+			nxt=$((nxt + 1))
+		done
+
+		if [ -n "$compat" ]; then
+			echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"
+		elif [ -n "$native" ]; then
+			echo "__SYSCALL($nr, $native)"
+		else
+			echo "__SYSCALL($nr, sys_ni_syscall)"
+		fi
+		nxt=$((nr + 1))
+	done
+} > "$outfile"