s390/syscalls: add syscalltbl script
Introduce the syscalltbl script to read the system call table and generate respective uapi unistd.h header files. Also it generates the contents syscalls.S - the real system call table - which is included by arch/s390/kernel/entry.S. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
Martin Schwidefsky
parent
857f46bfb0
commit
fd834e0970
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Generate system call table and header files
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#
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# Copyright IBM Corp. 2018
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# Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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#
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# File path to the system call table definition.
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# You can set the path with the -i option. If omitted,
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# system call table definitions are read from standard input.
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#
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SYSCALL_TBL=""
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create_syscall_table_entries()
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{
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local nr abi name entry64 entry32 _ignore
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local temp=$(mktemp ${TMPDIR:-/tmp}/syscalltbl-common.XXXXXXXXX)
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(
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#
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# Initialize with 0 to create an NI_SYSCALL for 0
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#
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local prev_nr=0 prev_32=sys_ni_syscall prev_64=sys_ni_syscall
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while read nr abi name entry64 entry32 _ignore; do
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test x$entry32 = x- && entry32=sys_ni_syscall
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test x$entry64 = x- && entry64=sys_ni_syscall
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if test $prev_nr -eq $nr; then
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#
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# Same syscall but different ABI, just update
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# the respective entry point
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#
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case $abi in
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32)
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prev_32=$entry32
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;;
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64)
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prev_64=$entry64
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;;
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esac
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continue;
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else
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printf "%d\t%s\t%s\n" $prev_nr $prev_64 $prev_32
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fi
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prev_nr=$nr
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prev_64=$entry64
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prev_32=$entry32
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done
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printf "%d\t%s\t%s\n" $prev_nr $prev_64 $prev_32
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) >> $temp
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#
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# Check for duplicate syscall numbers
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#
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if ! cat $temp |cut -f1 |uniq -d 2>&1; then
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echo "Error: generated system call table contains duplicate entries: $temp" >&2
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exit 1
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fi
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#
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# Generate syscall table
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#
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prev_nr=0
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while read nr entry64 entry32; do
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while test $prev_nr -lt $((nr - 1)); do
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printf "NI_SYSCALL\n"
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prev_nr=$((prev_nr + 1))
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done
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if test x$entry64 = xsys_ni_syscall &&
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test x$entry32 = xsys_ni_syscall; then
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printf "NI_SYSCALL\n"
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else
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printf "SYSCALL(%s,%s)\n" $entry64 $entry32
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fi
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prev_nr=$nr
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done < $temp
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rm $temp
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}
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generate_syscall_table()
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{
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cat <<-EoHEADER
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions for sys_call_table, each line represents an
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* entry in the table in the form
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* SYSCALL(64 bit syscall, 31 bit emulated syscall)
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*
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* This file is meant to be included from entry.S.
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*/
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#define NI_SYSCALL SYSCALL(sys_ni_syscall,sys_ni_syscall)
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EoHEADER
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grep -Ev '^(#|[[:blank:]]*$)' $SYSCALL_TBL \
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|sort -k1 -n \
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|create_syscall_table_entries
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}
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create_header_defines()
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{
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local nr abi name _ignore
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while read nr abi name _ignore; do
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printf "#define __NR_%s %d\n" $name $nr
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done
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}
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normalize_fileguard()
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{
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local fileguard="$1"
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echo "$1" |tr '[[:lower:]]' '[[:upper:]]' \
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|sed -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'
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}
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generate_syscall_header()
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{
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local abis=$(echo "($1)" | tr ',' '|')
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local filename="$2"
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local fileguard suffix
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if test "$filename"; then
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fileguard=$(normalize_fileguard "__UAPI_ASM_S390_$2")
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else
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case "$abis" in
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*64*) suffix=64 ;;
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*32*) suffix=32 ;;
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esac
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fileguard=$(normalize_fileguard "__UAPI_ASM_S390_SYSCALLS_$suffix")
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fi
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cat <<-EoHEADER
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef ${fileguard}
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#define ${fileguard}
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EoHEADER
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grep -E "^[[:digit:]]+[[:space:]]+${abis}" $SYSCALL_TBL \
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|sort -k1 -n \
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|create_header_defines
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cat <<-EoFOOTER
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#endif /* ${fileguard} */
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EoFOOTER
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}
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__max_syscall_nr()
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{
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local abis=$(echo "($1)" | tr ',' '|')
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grep -E "^[[:digit:]]+[[:space:]]+${abis}" $SYSCALL_TBL \
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|sed -ne 's/^\([[:digit:]]*\)[[:space:]].*/\1/p' \
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|sort -n \
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|tail -1
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}
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generate_syscall_nr()
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{
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local abis="$1"
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local max_syscall_nr num_syscalls
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max_syscall_nr=$(__max_syscall_nr "$abis")
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num_syscalls=$((max_syscall_nr + 1))
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cat <<-EoHEADER
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __ASM_S390_SYSCALLS_NR
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#define __ASM_S390_SYSCALLS_NR
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#define NR_syscalls ${num_syscalls}
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#endif /* __ASM_S390_SYSCALLS_NR */
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EoHEADER
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}
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#
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# Parse command line arguments
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#
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do_syscall_header=""
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do_syscall_table=""
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do_syscall_nr=""
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output_file=""
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abi_list="common,64"
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filename=""
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while getopts ":HNSXi:a:f:" arg; do
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case $arg in
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a)
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abi_list="$OPTARG"
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;;
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i)
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SYSCALL_TBL="$OPTARG"
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;;
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f)
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filename=${OPTARG##*/}
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;;
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H)
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do_syscall_header=1
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;;
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N)
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do_syscall_nr=1
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;;
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S)
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do_syscall_table=1
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;;
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X)
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set -x
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;;
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:)
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echo "Missing argument for -$OPTARG" >&2
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exit 1
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;;
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\?)
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echo "Invalid option specified" >&2
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exit 1
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;;
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esac
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done
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test "$do_syscall_header" && generate_syscall_header "$abi_list" "$filename"
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test "$do_syscall_table" && generate_syscall_table
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test "$do_syscall_nr" && generate_syscall_nr "$abi_list"
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exit 0
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