scripts/syscallnr.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0-only
   3 #
   4 # Generate a syscall number header.
   5 #
   6 # Each line of the syscall table should have the following format:
   7 #
   8 # NR ABI NAME [NATIVE] [COMPAT]
   9 #
  10 # NR       syscall number
  11 # ABI      ABI name
  12 # NAME     syscall name
  13 # NATIVE   native entry point (optional)
  14 # COMPAT   compat entry point (optional)
  15 set -e
  16
  17 usage() {
  18         echo >&2 "usage: $0 [--abis ABIS] [--prefix PREFIX] INFILE OUTFILE" >&2
  19         echo >&2
  20         echo >&2 "  INFILE    input syscall table"
  21         echo >&2 "  OUTFILE   output header file"
  22         echo >&2
  23         echo >&2 "options:"
  24         echo >&2 "  --abis ABIS        ABI(s) to handle (By default, all lines are handled)"
  25         echo >&2 "  --prefix PREFIX    The prefix to the macro like __NR_<PREFIX><NAME>"
  26         exit 1
  27 }
  28
  29 # default unless specified by options
  30 abis=
  31 prefix=
  32
  33 while [ $# -gt 0 ]
  34 do
  35         case $1 in
  36         --abis)
  37                 abis=$(echo "($2)" | tr ',' '|')
  38                 shift 2;;
  39         --prefix)
  40                 prefix=$2
  41                 shift 2;;
  42         -*)
  43                 echo "$1: unknown option" >&2
  44                 usage;;
  45         *)
  46                 break;;
  47         esac
  48 done
  49
  50 if [ $# -ne 2 ]; then
  51         usage
  52 fi
  53
  54 infile="$1"
  55 outfile="$2"
  56
  57 guard=_ASM_$(basename "$outfile" |
  58         sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
  59         -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g')
  60
  61 grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$infile" | sort -n | {
  62         echo "#ifndef $guard"
  63         echo "#define $guard"
  64         echo
  65
  66         max=0
  67         while read nr abi name native compat ; do
  68                 max=$nr
  69         done
  70
  71         echo "#define __NR_${prefix}syscalls $(($max + 1))"
  72         echo
  73         echo "#endif /* $guard */"
  74 } > "$outfile"