scripts/syscallhdr.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
  16 set -e
  17
  18 usage() {
  19         echo >&2 "usage: $0 [--abis ABIS] [--emit-nr] [--offset OFFSET] [--prefix PREFIX] INFILE OUTFILE" >&2
  20         echo >&2
  21         echo >&2 "  INFILE    input syscall table"
  22         echo >&2 "  OUTFILE   output header file"
  23         echo >&2
  24         echo >&2 "options:"
  25         echo >&2 "  --abis ABIS        ABI(s) to handle (By default, all lines are handled)"
  26         echo >&2 "  --emit-nr          Emit the macro of the number of syscalls (__NR_syscalls)"
  27         echo >&2 "  --offset OFFSET    The offset of syscall numbers"
  28         echo >&2 "  --prefix PREFIX    The prefix to the macro like __NR_<PREFIX><NAME>"
  29         exit 1
  30 }
  31
  32 # default unless specified by options
  33 abis=
  34 emit_nr=
  35 offset=
  36 prefix=
  37
  38 while [ $# -gt 0 ]
  39 do
  40         case $1 in
  41         --abis)
  42                 abis=$(echo "($2)" | tr ',' '|')
  43                 shift 2;;
  44         --emit-nr)
  45                 emit_nr=1
  46                 shift 1;;
  47         --offset)
  48                 offset=$2
  49                 shift 2;;
  50         --prefix)
  51                 prefix=$2
  52                 shift 2;;
  53         -*)
  54                 echo "$1: unknown option" >&2
  55                 usage;;
  56         *)
  57                 break;;
  58         esac
  59 done
  60
  61 if [ $# -ne 2 ]; then
  62         usage
  63 fi
  64
  65 infile="$1"
  66 outfile="$2"
  67
  68 guard=_UAPI_ASM_$(basename "$outfile" |
  69         sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
  70         -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g')
  71
  72 grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$infile" | {
  73         echo "#ifndef $guard"
  74         echo "#define $guard"
  75         echo
  76
  77         max=0
  78         while read nr abi name native compat ; do
  79
  80                 max=$nr
  81
  82                 if [ -n "$offset" ]; then
  83                         nr="($offset + $nr)"
  84                 fi
  85
  86                 echo "#define __NR_$prefix$name $nr"
  87         done
  88
  89         if [ -n "$emit_nr" ]; then
  90                 echo
  91                 echo "#ifdef __KERNEL__"
  92                 echo "#define __NR_${prefix}syscalls $(($max + 1))"
  93                 echo "#endif"
  94         fi
  95
  96         echo
  97         echo "#endif /* $guard */"
  98 } > "$outfile"