scripts/syscalltbl.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0-only
   3 #
   4 # Generate a syscall table 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] 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         exit 1
  27 }
  28
  29 # default unless specified by options
  30 abis=
  31
  32 while [ $# -gt 0 ]
  33 do
  34         case $1 in
  35         --abis)
  36                 abis=$(echo "($2)" | tr ',' '|')
  37                 shift 2;;
  38         -*)
  39                 echo "$1: unknown option" >&2
  40                 usage;;
  41         *)
  42                 break;;
  43         esac
  44 done
  45
  46 if [ $# -ne 2 ]; then
  47         usage
  48 fi
  49
  50 infile="$1"
  51 outfile="$2"
  52
  53 nxt=0
  54
  55 grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
  56
  57         while read nr abi name native compat ; do
  58
  59                 if [ $nxt -gt $nr ]; then
  60                         echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2
  61                         exit 1
  62                 fi
  63
  64                 while [ $nxt -lt $nr ]; do
  65                         echo "__SYSCALL($nxt, sys_ni_syscall)"
  66                         nxt=$((nxt + 1))
  67                 done
  68
  69                 if [ -n "$compat" ]; then
  70                         echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"
  71                 elif [ -n "$native" ]; then
  72                         echo "__SYSCALL($nr, $native)"
  73                 else
  74                         echo "__SYSCALL($nr, sys_ni_syscall)"
  75                 fi
  76                 nxt=$((nr + 1))
  77         done
  78 } > "$outfile"