1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
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
55syscall_macro() {
56    nr="$1"
57    name="$2"
58
59    echo "	[$nr] = \"$name\","
60}
61
62emit() {
63    nr="$1"
64    entry="$2"
65
66    syscall_macro "$nr" "$entry"
67}
68
69echo "static const char *const syscalltbl[] = {" > $outfile
70
71sorted_table=$(mktemp /tmp/syscalltbl.XXXXXX)
72grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | sort -n > $sorted_table
73
74max_nr=0
75# the params are: nr abi name entry compat
76# use _ for intentionally unused variables according to SC2034
77while read nr _ name _ _; do
78    emit "$nr" "$name" >> $outfile
79    max_nr=$nr
80done < $sorted_table
81
82rm -f $sorted_table
83
84echo "};" >> $outfile
85
86echo "#define SYSCALLTBL_MAX_ID ${max_nr}" >> $outfile
87