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"
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