ext: isolate from container/std

These are too general to belong in the container package. This targets the v0.4 release to reduce the wrapper maintenance burden.

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 95 insertions, 0 deletions

diff --git a/ext/mksysnum_linux.pl b/ext/mksysnum_linux.pl
new file mode 100755
index 00000000..1921e7b9
--- /dev/null
+++ b/ext/mksysnum_linux.pl
@@ -0,0 +1,95 @@
+#!/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,
+	"riscv64" => 281,
+);
+
+print <<EOF;
+// $command
+// Code generated by the command above; DO NOT EDIT.
+
+package ext
+
+import . "syscall"
+
+var syscallNum = map[string]SyscallNum{
+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 SyscallNum = 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;
+