Commit 9df526b0 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

scripts: add generic syscalltbl.sh 



Most of architectures generate syscall headers at the compile time
in a similar way.

The syscall table has the same format for all architectures. Each line
has up to 5 fields; syscall number, ABI, syscall name, native entry
point, and compat entry point. The syscall table is processed by
syscalltbl.sh script into header files.

Despite the same pattern, scripts are maintained per architecture,
which results in code duplication and bad maintainability.

As of v5.11-rc1, 12 architectures duplicate similar shell scripts:

  $ find arch -name syscalltbl.sh | sort
  arch/alpha/kernel/syscalls/syscalltbl.sh
  arch/arm/tools/syscalltbl.sh
  arch/ia64/kernel/syscalls/syscalltbl.sh
  arch/m68k/kernel/syscalls/syscalltbl.sh
  arch/microblaze/kernel/syscalls/syscalltbl.sh
  arch/mips/kernel/syscalls/syscalltbl.sh
  arch/parisc/kernel/syscalls/syscalltbl.sh
  arch/powerpc/kernel/syscalls/syscalltbl.sh
  arch/sh/kernel/syscalls/syscalltbl.sh
  arch/sparc/kernel/syscalls/syscalltbl.sh
  arch/x86/entry/syscalls/syscalltbl.sh
  arch/xtensa/kernel/syscalls/syscalltbl.sh

My goal is to unify them into scripts/syscalltbl.sh.

__SYSCALL_WITH_COMPAT should be defined as follows:

32-bit kernel:
  #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native)

64-bit kernel:

  #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat)

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 29c5c3ac

scripts/syscalltbl.sh

0 → 100755
+73 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0-only

#

# 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



grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | sort -n | {



	while read nr abi name native compat ; do



		while [ $nxt -lt $nr ]; do

			echo "__SYSCALL($nxt, sys_ni_syscall)"

			nxt=$((nxt + 1))

		done



		if [ -n "$compat" ]; then

			echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"

		elif [ -n "$native" ]; then

			echo "__SYSCALL($nr, $native)"

		else

			echo "__SYSCALL($nr, sys_ni_syscall)"

		fi

		nxt=$((nr + 1))

	done

} > "$outfile"