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#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
use strict;
use POSIX ();
my $command = "mksysnum_linux.pl ". join(' ', @ARGV);
my $uname_arch = (POSIX::uname)[4];
my %syscall_cutoff_arch = (
"x86" => 340,
"x86_64" => 302,
"aarch64" => 281,
);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package std
import . "syscall"
var syscallNum = map[string]ScmpSyscall{
EOF
my $offset = 0;
my $state = -1;
sub fmt {
my ($name, $num) = @_;
if($num > 999){
# ignore deprecated syscalls that are no longer implemented
# https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
return;
}
(my $name_upper = $name) =~ y/a-z/A-Z/;
$num = $num + $offset;
if($num > $syscall_cutoff_arch{$uname_arch} && $state == 0){ # not wired in Go standard library
print " SYS_$name_upper = $num\n";
}
elsif($state == -1){
print " \"$name\": SNR_$name_upper,\n";
}
elsif($state == 1){
print " SNR_$name_upper ScmpSyscall = SYS_$name_upper\n";
}
else{
return;
}
}
GENERATE:
my $prev;
open(GCC, "gcc -E -dD $ARGV[0] |") || die "can't run gcc";
while(<GCC>){
if(/^#define __NR_Linux\s+([0-9]+)/){
# mips/mips64: extract offset
$offset = $1;
}
elsif(/^#define __NR_syscalls\s+/) {
# ignore redefinitions of __NR_syscalls
}
elsif(/^#define __NR_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR3264_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)/){
fmt($1, $prev+$2)
}
elsif(/^#define __NR_(\w+)\s+\(__NR_Linux \+ ([0-9]+)/){
fmt($1, $2);
}
}
if($state == -1){
print "}\n\nconst (\n";
}
elsif($state == 0){
print ")\n\nconst (\n";
}
elsif($state == 1){
print ")";
exit;
}
++$state;
goto GENERATE;
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