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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# 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
syscall_macro() {
nr="$1"
name="$2"
echo " [$nr] = \"$name\","
}
emit() {
nr="$1"
entry="$2"
syscall_macro "$nr" "$entry"
}
echo "static const char *const syscalltbl[] = {" > $outfile
sorted_table=$(mktemp /tmp/syscalltbl.XXXXXX)
grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | sort -n > $sorted_table
max_nr=0
# the params are: nr abi name entry compat
# use _ for intentionally unused variables according to SC2034
while read nr _ name _ _; do
emit "$nr" "$name" >> $outfile
max_nr=$nr
done < $sorted_table
rm -f $sorted_table
echo "};" >> $outfile
echo "#define SYSCALLTBL_MAX_ID ${max_nr}" >> $outfile
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