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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Generate system call table and header files
#
# Copyright IBM Corp. 2018
# Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
#
# File path to the system call table definition.
# You can set the path with the -i option. If omitted,
# system call table definitions are read from standard input.
#
SYSCALL_TBL=""
create_syscall_table_entries()
{
local nr abi name entry64 entry32 _ignore
local temp=$(mktemp ${TMPDIR:-/tmp}/syscalltbl-common.XXXXXXXXX)
(
#
# Initialize with 0 to create an NI_SYSCALL for 0
#
local prev_nr=0 prev_32=sys_ni_syscall prev_64=sys_ni_syscall
while read nr abi name entry64 entry32 _ignore; do
test x$entry32 = x- && entry32=sys_ni_syscall
test x$entry64 = x- && entry64=sys_ni_syscall
if test $prev_nr -eq $nr; then
#
# Same syscall but different ABI, just update
# the respective entry point
#
case $abi in
32)
prev_32=$entry32
;;
64)
prev_64=$entry64
;;
esac
continue;
else
printf "%d\t%s\t%s\n" $prev_nr $prev_64 $prev_32
fi
prev_nr=$nr
prev_64=$entry64
prev_32=$entry32
done
printf "%d\t%s\t%s\n" $prev_nr $prev_64 $prev_32
) >> $temp
#
# Check for duplicate syscall numbers
#
if ! cat $temp |cut -f1 |uniq -d 2>&1; then
echo "Error: generated system call table contains duplicate entries: $temp" >&2
exit 1
fi
#
# Generate syscall table
#
prev_nr=0
while read nr entry64 entry32; do
while test $prev_nr -lt $((nr - 1)); do
printf "NI_SYSCALL\n"
prev_nr=$((prev_nr + 1))
done
if test x$entry64 = xsys_ni_syscall &&
test x$entry32 = xsys_ni_syscall; then
printf "NI_SYSCALL\n"
else
printf "SYSCALL(%s,%s)\n" $entry64 $entry32
fi
prev_nr=$nr
done < $temp
rm $temp
}
generate_syscall_table()
{
cat <<-EoHEADER
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Definitions for sys_call_table, each line represents an
* entry in the table in the form
* SYSCALL(64 bit syscall, 31 bit emulated syscall)
*
* This file is meant to be included from entry.S.
*/
#define NI_SYSCALL SYSCALL(sys_ni_syscall,sys_ni_syscall)
EoHEADER
grep -Ev '^(#|[[:blank:]]*$)' $SYSCALL_TBL \
|sort -k1 -n \
|create_syscall_table_entries
}
create_header_defines()
{
local nr abi name _ignore
while read nr abi name _ignore; do
printf "#define __NR_%s %d\n" $name $nr
done
}
normalize_fileguard()
{
local fileguard="$1"
echo "$1" |tr '[[:lower:]]' '[[:upper:]]' \
|sed -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'
}
generate_syscall_header()
{
local abis=$(echo "($1)" | tr ',' '|')
local filename="$2"
local fileguard suffix
if test "$filename"; then
fileguard=$(normalize_fileguard "__UAPI_ASM_S390_$2")
else
case "$abis" in
*64*) suffix=64 ;;
*32*) suffix=32 ;;
esac
fileguard=$(normalize_fileguard "__UAPI_ASM_S390_SYSCALLS_$suffix")
fi
cat <<-EoHEADER
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef ${fileguard}
#define ${fileguard}
EoHEADER
grep -E "^[[:digit:]]+[[:space:]]+${abis}" $SYSCALL_TBL \
|sort -k1 -n \
|create_header_defines
cat <<-EoFOOTER
#endif /* ${fileguard} */
EoFOOTER
}
__max_syscall_nr()
{
local abis=$(echo "($1)" | tr ',' '|')
grep -E "^[[:digit:]]+[[:space:]]+${abis}" $SYSCALL_TBL \
|sed -ne 's/^\([[:digit:]]*\)[[:space:]].*/\1/p' \
|sort -n \
|tail -1
}
generate_syscall_nr()
{
local abis="$1"
local max_syscall_nr num_syscalls
max_syscall_nr=$(__max_syscall_nr "$abis")
num_syscalls=$((max_syscall_nr + 1))
cat <<-EoHEADER
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_S390_SYSCALLS_NR
#define __ASM_S390_SYSCALLS_NR
#define NR_syscalls ${num_syscalls}
#endif /* __ASM_S390_SYSCALLS_NR */
EoHEADER
}
#
# Parse command line arguments
#
do_syscall_header=""
do_syscall_table=""
do_syscall_nr=""
output_file=""
abi_list="common,64"
filename=""
while getopts ":HNSXi:a:f:" arg; do
case $arg in
a)
abi_list="$OPTARG"
;;
i)
SYSCALL_TBL="$OPTARG"
;;
f)
filename=${OPTARG##*/}
;;
H)
do_syscall_header=1
;;
N)
do_syscall_nr=1
;;
S)
do_syscall_table=1
;;
X)
set -x
;;
:)
echo "Missing argument for -$OPTARG" >&2
exit 1
;;
\?)
echo "Invalid option specified" >&2
exit 1
;;
esac
done
test "$do_syscall_header" && generate_syscall_header "$abi_list" "$filename"
test "$do_syscall_table" && generate_syscall_table
test "$do_syscall_nr" && generate_syscall_nr "$abi_list"
exit 0
|
