1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0-only
3#
4# Generate a syscall table header.
5#
6# Each line of the syscall table should have the following format:
7#
8# NR ABI NAME [NATIVE] [COMPAT]
9#
10# NR       syscall number
11# ABI      ABI name
12# NAME     syscall name
13# NATIVE   native entry point (optional)
14# COMPAT   compat entry point (optional)
15
16set -e
17
18usage() {
19	echo >&2 "usage: $0 [--abis ABIS] INFILE OUTFILE" >&2
20	echo >&2
21	echo >&2 "  INFILE    input syscall table"
22	echo >&2 "  OUTFILE   output header file"
23	echo >&2
24	echo >&2 "options:"
25	echo >&2 "  --abis ABIS        ABI(s) to handle (By default, all lines are handled)"
26	exit 1
27}
28
29# default unless specified by options
30abis=
31
32while [ $# -gt 0 ]
33do
34	case $1 in
35	--abis)
36		abis=$(echo "($2)" | tr ',' '|')
37		shift 2;;
38	-*)
39		echo "$1: unknown option" >&2
40		usage;;
41	*)
42		break;;
43	esac
44done
45
46if [ $# -ne 2 ]; then
47	usage
48fi
49
50infile="$1"
51outfile="$2"
52
53nxt=0
54
55grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
56
57	while read nr abi name native compat ; do
58
59		if [ $nxt -gt $nr ]; then
60			echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2
61			exit 1
62		fi
63
64		while [ $nxt -lt $nr ]; do
65			echo "__SYSCALL($nxt, sys_ni_syscall)"
66			nxt=$((nxt + 1))
67		done
68
69		if [ -n "$compat" ]; then
70			echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"
71		elif [ -n "$native" ]; then
72			echo "__SYSCALL($nr, $native)"
73		else
74			echo "__SYSCALL($nr, sys_ni_syscall)"
75		fi
76		nxt=$((nr + 1))
77	done
78} > "$outfile"
79