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Text file src/syscall/mksysnum_linux.pl

Documentation: syscall

     1#!/usr/bin/env perl
     2# Copyright 2009 The Go Authors. All rights reserved.
     3# Use of this source code is governed by a BSD-style
     4# license that can be found in the LICENSE file.
     5
     6use strict;
     7
     8my $command = "mksysnum_linux.pl ". join(' ', @ARGV);
     9
    10print <<EOF;
    11// $command
    12// Code generated by the command above; DO NOT EDIT.
    13
    14package syscall
    15
    16const(
    17EOF
    18
    19my $offset = 0;
    20
    21sub fmt {
    22	my ($name, $num) = @_;
    23	if($num > 999){
    24		# ignore deprecated syscalls that are no longer implemented
    25		# https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
    26		return;
    27	}
    28	$name =~ y/a-z/A-Z/;
    29	$num = $num + $offset;
    30	print "	SYS_$name = $num;\n";
    31}
    32
    33my $prev;
    34open(GCC, "gcc -E -dD $ARGV[0] |") || die "can't run gcc";
    35while(<GCC>){
    36	if(/^#define __NR_Linux\s+([0-9]+)/){
    37		# mips/mips64: extract offset
    38		$offset = $1;
    39	}
    40	elsif(/^#define __NR_syscalls\s+/) {
    41		# ignore redefinitions of __NR_syscalls
    42	}
    43	elsif(/^#define __NR_(\w+)\s+([0-9]+)/){
    44		$prev = $2;
    45		fmt($1, $2);
    46	}
    47	elsif(/^#define __NR3264_(\w+)\s+([0-9]+)/){
    48		$prev = $2;
    49		fmt($1, $2);
    50	}
    51	elsif(/^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)/){
    52		fmt($1, $prev+$2)
    53	}
    54	elsif(/^#define __NR_(\w+)\s+\(__NR_Linux \+ ([0-9]+)/){
    55		fmt($1, $2);
    56	}
    57}
    58
    59print <<EOF;
    60)
    61EOF

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