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scripts/syscallhdr.sh
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# Generate a syscall number 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] [--emit-nr] [--offset OFFSET] [--prefix PREFIX] 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)"
echo >&2 " --emit-nr Emit the macro of the number of syscalls (__NR_syscalls)"
echo >&2 " --offset OFFSET The offset of syscall numbers"
echo >&2 " --prefix PREFIX The prefix to the macro like __NR_<PREFIX><NAME>"
exit 1
}
# default unless specified by options
abis=
emit_nr=
offset=
prefix=
while [ $# -gt 0 ]
do
case $1 in
--abis)
abis=$(echo "($2)" | tr ',' '|')
shift 2;;
--emit-nr)
emit_nr=1
shift 1;;
--offset)
offset=$2
shift 2;;
--prefix)
prefix=$2
shift 2;;
-*)
echo "$1: unknown option" >&2
usage;;
*)
break;;
esac
done
if [ $# -ne 2 ]; then
usage
fi
infile="$1"
outfile="$2"
guard=_UAPI_ASM_$(basename "$outfile" |
sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
-e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g')
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grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$infile" | {
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echo "#ifndef $guard"
echo "#define $guard"
echo
max=0
while read nr abi name native compat ; do
max=$nr
if [ -n "$offset" ]; then
nr="($offset + $nr)"
fi
echo "#define __NR_$prefix$name $nr"
done
if [ -n "$emit_nr" ]; then
echo
echo "#ifdef __KERNEL__"
echo "#define __NR_${prefix}syscalls $(($max + 1))"
echo "#endif"
fi
echo
echo "#endif /* $guard */"
} > "$outfile"
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