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Current Path: /opt/golang/1.17.2/src/syscall

📁 ..
📄 asm9_unix1_amd64.s(1.01 KB)
📄 asm9_unix2_amd64.s(1.23 KB)
📄 asm_aix_ppc64.s(540 B)
📄 asm_darwin_amd64.s(2.82 KB)
📄 asm_darwin_arm64.s(2.71 KB)
📄 asm_freebsd_arm.s(2.96 KB)
📄 asm_freebsd_arm64.s(2.68 KB)
📄 asm_linux_386.s(5.05 KB)
📄 asm_linux_amd64.s(3.34 KB)
📄 asm_linux_arm.s(4 KB)
📄 asm_linux_arm64.s(2.73 KB)
📄 asm_linux_mips64x.s(2.71 KB)
📄 asm_linux_mipsx.s(3.66 KB)
📄 asm_linux_ppc64x.s(2.69 KB)
📄 asm_linux_riscv64.s(2.88 KB)
📄 asm_linux_s390x.s(4.19 KB)
📄 asm_netbsd_arm.s(2.85 KB)
📄 asm_netbsd_arm64.s(2.77 KB)
📄 asm_openbsd_386.s(1.04 KB)
📄 asm_openbsd_amd64.s(1.04 KB)
📄 asm_openbsd_arm.s(1.04 KB)
📄 asm_openbsd_arm64.s(1.04 KB)
📄 asm_openbsd_mips64.s(2.85 KB)
📄 asm_plan9_386.s(3.14 KB)
📄 asm_plan9_amd64.s(3.06 KB)
📄 asm_plan9_arm.s(3.25 KB)
📄 asm_solaris_amd64.s(1.79 KB)
📄 asm_unix_386.s(2.76 KB)
📄 asm_unix_amd64.s(2.11 KB)
📄 bpf_bsd.go(4.67 KB)
📄 bpf_darwin.go(3.97 KB)
📄 const_plan9.go(1.2 KB)
📄 creds_test.go(3.34 KB)
📄 dir_plan9.go(5.62 KB)
📄 dirent.go(3.1 KB)
📄 dirent_test.go(3.15 KB)
📄 dll_windows.go(10.19 KB)
📄 endian_big.go(283 B)
📄 endian_little.go(365 B)
📄 env_unix.go(3 KB)
📄 env_windows.go(1.75 KB)
📄 errors_plan9.go(1.61 KB)
📄 exec_aix_test.go(831 B)
📄 exec_bsd.go(6.98 KB)
📄 exec_libc.go(7.44 KB)
📄 exec_libc2.go(7.48 KB)
📄 exec_linux.go(18.98 KB)
📄 exec_linux_test.go(19.07 KB)
📄 exec_plan9.go(13.23 KB)
📄 exec_solaris_test.go(827 B)
📄 exec_unix.go(8.93 KB)
📄 exec_unix_test.go(7.2 KB)
📄 exec_windows.go(11.09 KB)
📄 exec_windows_test.go(3.1 KB)
📄 export_darwin_test.go(314 B)
📄 export_freebsd_test.go(304 B)
📄 export_linux_test.go(252 B)
📄 export_unix_test.go(396 B)
📄 export_windows_test.go(439 B)
📄 flock.go(753 B)
📄 flock_aix.go(564 B)
📄 flock_darwin.go(405 B)
📄 flock_linux_32bit.go(565 B)
📄 forkpipe.go(527 B)
📄 forkpipe2.go(339 B)
📄 fs_js.go(10.56 KB)
📄 getdirentries_test.go(2.11 KB)
📁 js
📄 lsf_linux.go(2.12 KB)
📄 mkall.sh(12.79 KB)
📄 mkasm.go(1.76 KB)
📄 mkerrors.sh(10.65 KB)
📄 mkpost.go(1.99 KB)
📄 mksyscall.pl(9.95 KB)
📄 mksyscall_libc.pl(7.98 KB)
📄 mksyscall_windows.go(2 KB)
📄 mksysctl_openbsd.pl(5.04 KB)
📄 mksysnum_dragonfly.pl(866 B)
📄 mksysnum_freebsd.pl(1.35 KB)
📄 mksysnum_linux.pl(1.26 KB)
📄 mksysnum_netbsd.pl(1.01 KB)
📄 mksysnum_openbsd.pl(872 B)
📄 mksysnum_plan9.sh(459 B)
📄 mmap_unix_test.go(623 B)
📄 msan.go(425 B)
📄 msan0.go(358 B)
📄 net.go(1.19 KB)
📄 net_js.go(2.14 KB)
📄 netlink_linux.go(4.67 KB)
📄 ptrace_darwin.go(396 B)
📄 ptrace_ios.go(382 B)
📄 pwd_plan9.go(1.55 KB)
📄 route_bsd.go(9.15 KB)
📄 route_darwin.go(2.01 KB)
📄 route_dragonfly.go(2.61 KB)
📄 route_freebsd.go(2.67 KB)
📄 route_freebsd_32bit.go(1.33 KB)
📄 route_freebsd_64bit.go(776 B)
📄 route_netbsd.go(1.43 KB)
📄 route_openbsd.go(1.46 KB)
📄 security_windows.go(10.12 KB)
📄 setuidgid_32_linux.go(469 B)
📄 setuidgid_linux.go(447 B)
📄 sock_cloexec_linux.go(632 B)
📄 sockcmsg_dragonfly.go(547 B)
📄 sockcmsg_linux.go(1.12 KB)
📄 sockcmsg_unix.go(2.65 KB)
📄 sockcmsg_unix_other.go(1.14 KB)
📄 syscall.go(3.61 KB)
📄 syscall_aix.go(18.05 KB)
📄 syscall_aix_ppc64.go(405 B)
📄 syscall_bsd.go(14.39 KB)
📄 syscall_bsd_test.go(1.21 KB)
📄 syscall_darwin.go(11.93 KB)
📄 syscall_darwin_amd64.go(1.92 KB)
📄 syscall_darwin_arm64.go(1.84 KB)
📄 syscall_dragonfly.go(8.29 KB)
📄 syscall_dragonfly_amd64.go(1.12 KB)
📄 syscall_dup2_linux.go(409 B)
📄 syscall_dup3_linux.go(275 B)
📄 syscall_freebsd.go(15.82 KB)
📄 syscall_freebsd_386.go(1.17 KB)
📄 syscall_freebsd_amd64.go(1.12 KB)
📄 syscall_freebsd_arm.go(1.16 KB)
📄 syscall_freebsd_arm64.go(1.12 KB)
📄 syscall_freebsd_test.go(1.37 KB)
📄 syscall_illumos.go(1.2 KB)
📄 syscall_js.go(6.64 KB)
📄 syscall_linux.go(33.3 KB)
📄 syscall_linux_386.go(10.63 KB)
📄 syscall_linux_amd64.go(5.34 KB)
📄 syscall_linux_arm.go(7.32 KB)
📄 syscall_linux_arm64.go(6.68 KB)
📄 syscall_linux_mips64x.go(6.54 KB)
📄 syscall_linux_mipsx.go(6.98 KB)
📄 syscall_linux_ppc64x.go(5.19 KB)
📄 syscall_linux_riscv64.go(6.32 KB)
📄 syscall_linux_s390x.go(8.59 KB)
📄 syscall_linux_test.go(20.69 KB)
📄 syscall_netbsd.go(7.59 KB)
📄 syscall_netbsd_386.go(716 B)
📄 syscall_netbsd_amd64.go(709 B)
📄 syscall_netbsd_arm.go(716 B)
📄 syscall_netbsd_arm64.go(709 B)
📄 syscall_openbsd.go(6.67 KB)
📄 syscall_openbsd1.go(634 B)
📄 syscall_openbsd_386.go(715 B)
📄 syscall_openbsd_amd64.go(701 B)
📄 syscall_openbsd_arm.go(715 B)
📄 syscall_openbsd_arm64.go(906 B)
📄 syscall_openbsd_libc.go(3.46 KB)
📄 syscall_openbsd_mips64.go(906 B)
📄 syscall_plan9.go(8.94 KB)
📄 syscall_plan9_test.go(1.15 KB)
📄 syscall_ptrace_test.go(824 B)
📄 syscall_solaris.go(15.07 KB)
📄 syscall_solaris_amd64.go(487 B)
📄 syscall_test.go(1.44 KB)
📄 syscall_unix.go(8.46 KB)
📄 syscall_unix_test.go(10.4 KB)
📄 syscall_windows.go(46.08 KB)
📄 syscall_windows_test.go(3.39 KB)
📄 tables_js.go(19.19 KB)
📄 time_fake.go(696 B)
📄 time_nofake.go(371 B)
📄 timestruct.go(1.07 KB)
📄 types_aix.go(3.37 KB)
📄 types_darwin.go(5.05 KB)
📄 types_dragonfly.go(5.06 KB)
📄 types_freebsd.go(6.98 KB)
📄 types_illumos_amd64.go(397 B)
📄 types_linux.go(10.7 KB)
📄 types_netbsd.go(4.78 KB)
📄 types_openbsd.go(5.06 KB)
📄 types_solaris.go(4.9 KB)
📄 types_windows.go(27.71 KB)
📄 types_windows_386.go(477 B)
📄 types_windows_amd64.go(477 B)
📄 types_windows_arm.go(477 B)
📄 types_windows_arm64.go(477 B)
📄 zerrors_aix_ppc64.go(47.16 KB)
📄 zerrors_darwin_amd64.go(55.3 KB)
📄 zerrors_darwin_arm64.go(55.81 KB)
📄 zerrors_dragonfly_amd64.go(59.65 KB)
📄 zerrors_freebsd_386.go(67.38 KB)
📄 zerrors_freebsd_amd64.go(67.42 KB)
📄 zerrors_freebsd_arm.go(67.37 KB)
📄 zerrors_freebsd_arm64.go(67.43 KB)
📄 zerrors_linux_386.go(58.33 KB)
📄 zerrors_linux_amd64.go(58.37 KB)
📄 zerrors_linux_arm.go(58.86 KB)
📄 zerrors_linux_arm64.go(69.54 KB)
📄 zerrors_linux_mips.go(70.14 KB)
📄 zerrors_linux_mips64.go(69.46 KB)
📄 zerrors_linux_mips64le.go(69.46 KB)
📄 zerrors_linux_mipsle.go(70.14 KB)
📄 zerrors_linux_ppc64.go(71.86 KB)
📄 zerrors_linux_ppc64le.go(72.82 KB)
📄 zerrors_linux_riscv64.go(71.76 KB)
📄 zerrors_linux_s390x.go(74.28 KB)
📄 zerrors_netbsd_386.go(67.5 KB)
📄 zerrors_netbsd_amd64.go(67.09 KB)
📄 zerrors_netbsd_arm.go(66.51 KB)
📄 zerrors_netbsd_arm64.go(67.09 KB)
📄 zerrors_openbsd_386.go(62.54 KB)
📄 zerrors_openbsd_amd64.go(62.5 KB)
📄 zerrors_openbsd_arm.go(62.49 KB)
📄 zerrors_openbsd_arm64.go(66.36 KB)
📄 zerrors_openbsd_mips64.go(66.66 KB)
📄 zerrors_solaris_amd64.go(50.74 KB)
📄 zerrors_windows.go(9.97 KB)
📄 zsyscall_aix_ppc64.go(40.16 KB)
📄 zsyscall_darwin_amd64.go(50.65 KB)
📄 zsyscall_darwin_amd64.s(8.64 KB)
📄 zsyscall_darwin_arm64.go(50.6 KB)
📄 zsyscall_darwin_arm64.s(8.61 KB)
📄 zsyscall_dragonfly_amd64.go(31.21 KB)
📄 zsyscall_freebsd_386.go(33.58 KB)
📄 zsyscall_freebsd_amd64.go(33.44 KB)
📄 zsyscall_freebsd_arm.go(33.6 KB)
📄 zsyscall_freebsd_arm64.go(33.44 KB)
📄 zsyscall_linux_386.go(34.35 KB)
📄 zsyscall_linux_amd64.go(39.48 KB)
📄 zsyscall_linux_arm.go(38.57 KB)
📄 zsyscall_linux_arm64.go(37.74 KB)
📄 zsyscall_linux_mips.go(40.33 KB)
📄 zsyscall_linux_mips64.go(40.12 KB)
📄 zsyscall_linux_mips64le.go(40.12 KB)
📄 zsyscall_linux_mipsle.go(40.34 KB)
📄 zsyscall_linux_ppc64.go(40.76 KB)
📄 zsyscall_linux_ppc64le.go(40.76 KB)
📄 zsyscall_linux_riscv64.go(37.77 KB)
📄 zsyscall_linux_s390x.go(34.76 KB)
📄 zsyscall_netbsd_386.go(29.65 KB)
📄 zsyscall_netbsd_amd64.go(29.51 KB)
📄 zsyscall_netbsd_arm.go(29.65 KB)
📄 zsyscall_netbsd_arm64.go(29.51 KB)
📄 zsyscall_openbsd_386.go(46.85 KB)
📄 zsyscall_openbsd_386.s(7.89 KB)
📄 zsyscall_openbsd_amd64.go(46.71 KB)
📄 zsyscall_openbsd_amd64.s(7.89 KB)
📄 zsyscall_openbsd_arm.go(46.87 KB)
📄 zsyscall_openbsd_arm.s(7.89 KB)
📄 zsyscall_openbsd_arm64.go(46.71 KB)
📄 zsyscall_openbsd_arm64.s(7.89 KB)
📄 zsyscall_openbsd_mips64.go(30.35 KB)
📄 zsyscall_plan9_386.go(6.19 KB)
📄 zsyscall_plan9_amd64.go(6.2 KB)
📄 zsyscall_plan9_arm.go(6.19 KB)
📄 zsyscall_solaris_amd64.go(35.82 KB)
📄 zsyscall_windows.go(56.68 KB)
📄 zsysctl_openbsd.go(11.71 KB)
📄 zsysnum_darwin_amd64.go(14.57 KB)
📄 zsysnum_darwin_arm64.go(14.41 KB)
📄 zsysnum_dragonfly_amd64.go(22.97 KB)
📄 zsysnum_freebsd_386.go(25.67 KB)
📄 zsysnum_freebsd_amd64.go(25.68 KB)
📄 zsysnum_freebsd_arm.go(25.67 KB)
📄 zsysnum_freebsd_arm64.go(36.12 KB)
📄 zsysnum_linux_386.go(11.29 KB)
📄 zsysnum_linux_amd64.go(10.13 KB)
📄 zsysnum_linux_arm.go(11.57 KB)
📄 zsysnum_linux_arm64.go(8.97 KB)
📄 zsysnum_linux_mips.go(12.1 KB)
📄 zsysnum_linux_mips64.go(10.93 KB)
📄 zsysnum_linux_mips64le.go(10.93 KB)
📄 zsysnum_linux_mipsle.go(12.1 KB)
📄 zsysnum_linux_ppc64.go(11.49 KB)
📄 zsysnum_linux_ppc64le.go(11.51 KB)
📄 zsysnum_linux_riscv64.go(8.88 KB)
📄 zsysnum_linux_s390x.go(10.64 KB)
📄 zsysnum_netbsd_386.go(25.71 KB)
📄 zsysnum_netbsd_amd64.go(25.71 KB)
📄 zsysnum_netbsd_arm.go(25.71 KB)
📄 zsysnum_netbsd_arm64.go(25.71 KB)
📄 zsysnum_openbsd_386.go(14.18 KB)
📄 zsysnum_openbsd_amd64.go(14.18 KB)
📄 zsysnum_openbsd_arm.go(14.48 KB)
📄 zsysnum_openbsd_arm64.go(14.72 KB)
📄 zsysnum_openbsd_mips64.go(14.93 KB)
📄 zsysnum_plan9.go(1.03 KB)
📄 zsysnum_solaris_amd64.go(317 B)
📄 ztypes_aix_ppc64.go(4.17 KB)
📄 ztypes_darwin_amd64.go(6.97 KB)
📄 ztypes_darwin_arm64.go(6.97 KB)
📄 ztypes_dragonfly_amd64.go(6.73 KB)
📄 ztypes_freebsd_386.go(9.03 KB)
📄 ztypes_freebsd_amd64.go(9.03 KB)
📄 ztypes_freebsd_arm.go(9.04 KB)
📄 ztypes_freebsd_arm64.go(9.03 KB)
📄 ztypes_linux_386.go(11.57 KB)
📄 ztypes_linux_amd64.go(11.94 KB)
📄 ztypes_linux_arm.go(11.46 KB)
📄 ztypes_linux_arm64.go(10.15 KB)
📄 ztypes_linux_mips.go(9.93 KB)
📄 ztypes_linux_mips64.go(10.05 KB)
📄 ztypes_linux_mips64le.go(10.05 KB)
📄 ztypes_linux_mipsle.go(9.93 KB)
📄 ztypes_linux_ppc64.go(10.24 KB)
📄 ztypes_linux_ppc64le.go(10.37 KB)
📄 ztypes_linux_riscv64.go(10.2 KB)
📄 ztypes_linux_s390x.go(10.39 KB)
📄 ztypes_netbsd_386.go(6.01 KB)
📄 ztypes_netbsd_amd64.go(6.19 KB)
📄 ztypes_netbsd_arm.go(6.15 KB)
📄 ztypes_netbsd_arm64.go(6.19 KB)
📄 ztypes_openbsd_386.go(6.75 KB)
📄 ztypes_openbsd_amd64.go(6.91 KB)
📄 ztypes_openbsd_arm.go(6.84 KB)
📄 ztypes_openbsd_arm64.go(6.66 KB)
📄 ztypes_openbsd_mips64.go(6.66 KB)
📄 ztypes_solaris_amd64.go(5.59 KB)

Editing: mksyscall.pl

#!/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.

# This program reads a file containing function prototypes
# (like syscall_darwin.go) and generates system call bodies.
# The prototypes are marked by lines beginning with "//sys"
# and read like func declarations if //sys is replaced by func, but:
#	* The parameter lists must give a name for each argument.
#	  This includes return parameters.
#	* The parameter lists must give a type for each argument:
#	  the (x, y, z int) shorthand is not allowed.
#	* If the return parameter is an error number, it must be named errno.

# A line beginning with //sysnb is like //sys, except that the
# goroutine will not be suspended during the execution of the system
# call.  This must only be used for system calls which can never
# block, as otherwise the system call could cause all goroutines to
# hang.

use strict;

my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
my $errors = 0;
my $_32bit = "";
my $plan9 = 0;
my $darwin = 0;
my $openbsd = 0;
my $netbsd = 0;
my $dragonfly = 0;
my $arm = 0; # 64-bit value should use (even, odd)-pair
my $libc = 0;
my $tags = "";  # build tags
my $newtags = ""; # new style build tags
my $extraimports = "";

if($ARGV[0] eq "-b32") {
	$_32bit = "big-endian";
	shift;
} elsif($ARGV[0] eq "-l32") {
	$_32bit = "little-endian";
	shift;
}
if($ARGV[0] eq "-plan9") {
	$plan9 = 1;
	shift;
}
if($ARGV[0] eq "-darwin") {
	$darwin = 1;
	$libc = 1;
	shift;
}
if($ARGV[0] eq "-openbsd") {
	$openbsd = 1;
	shift;
}
if($ARGV[0] eq "-netbsd") {
	$netbsd = 1;
	shift;
}
if($ARGV[0] eq "-dragonfly") {
	$dragonfly = 1;
	shift;
}
if($ARGV[0] eq "-arm") {
	$arm = 1;
	shift;
}
if($ARGV[0] eq "-libc") {
	$libc = 1;
	shift;
}
if($ARGV[0] eq "-tags") {
	shift;
	$tags = $ARGV[0];
	shift;
}

if($ARGV[0] =~ /^-/) {
	print STDERR "usage: mksyscall.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
	exit 1;
}

if($libc) {
	$extraimports = 'import "internal/abi"';
}

sub parseparamlist($) {
	my ($list) = @_;
	$list =~ s/^\s*//;
	$list =~ s/\s*$//;
	if($list eq "") {
		return ();
	}
	return split(/\s*,\s*/, $list);
}

sub parseparam($) {
	my ($p) = @_;
	if($p !~ /^(\S*) (\S*)$/) {
		print STDERR "$ARGV:$.: malformed parameter: $p\n";
		$errors = 1;
		return ("xx", "int");
	}
	return ($1, $2);
}

# set of trampolines we've already generated
my %trampolines;

my $text = "";
while(<>) {
	chomp;
	s/\s+/ /g;
	s/^\s+//;
	s/\s+$//;
	my $nonblock = /^\/\/sysnb /;
	next if !/^\/\/sys / && !$nonblock;

# Line must be of the form
	#	func Open(path string, mode int, perm int) (fd int, errno error)
	# Split into name, in params, out params.
	if(!/^\/\/sys(nb)? (\w+)$([^()]*)$\s*(?:$([^()]+)$)?\s*(?:=\s*((?i)_?SYS_[A-Z0-9_]+))?$/) {
		print STDERR "$ARGV:$.: malformed //sys declaration\n";
		$errors = 1;
		next;
	}
	my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);

# Split argument lists on comma.
	my @in = parseparamlist($in);
	my @out = parseparamlist($out);

# Try in vain to keep people from editing this file.
	# The theory is that they jump into the middle of the file
	# without reading the header.
	$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";

if (($darwin && $func eq "ptrace1") || (($openbsd && $libc) && $func eq "ptrace")) {
		# The ptrace function is called from forkAndExecInChild where stack
		# growth is forbidden.
		$text .= "//go:nosplit\n"
	}

# Go function header.
	my $out_decl = @out ? sprintf(" (%s)", join(', ', @out)) : "";
	$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out_decl;

# Check if err return available
	my $errvar = "";
	foreach my $p (@out) {
		my ($name, $type) = parseparam($p);
		if($type eq "error") {
			$errvar = $name;
			last;
		}
	}

# Prepare arguments to Syscall.
	my @args = ();
	my $n = 0;
	foreach my $p (@in) {
		my ($name, $type) = parseparam($p);
		if($type =~ /^\*/) {
			push @args, "uintptr(unsafe.Pointer($name))";
		} elsif($type eq "string" && $errvar ne "") {
			$text .= "\tvar _p$n *byte\n";
			$text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
			$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
			push @args, "uintptr(unsafe.Pointer(_p$n))";
			$n++;
		} elsif($type eq "string") {
			print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
			$text .= "\tvar _p$n *byte\n";
			$text .= "\t_p$n, _ = BytePtrFromString($name)\n";
			push @args, "uintptr(unsafe.Pointer(_p$n))";
			$n++;
		} elsif($type =~ /^\[\](.*)/) {
			# Convert slice into pointer, length.
			# Have to be careful not to take address of &a[0] if len == 0:
			# pass dummy pointer in that case.
			# Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
			$text .= "\tvar _p$n unsafe.Pointer\n";
			$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
			$text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
			$text .= "\n";
			push @args, "uintptr(_p$n)", "uintptr(len($name))";
			$n++;
		} elsif($type eq "int64" && ($openbsd || $netbsd)) {
			if (!$libc) {
				push @args, "0";
			}
			if($libc && $arm && @args % 2) {
				# arm abi specifies 64 bit argument must be 64 bit aligned.
				push @args, "0"
			}
			if($_32bit eq "big-endian") {
				push @args, "uintptr($name>>32)", "uintptr($name)";
			} elsif($_32bit eq "little-endian") {
				push @args, "uintptr($name)", "uintptr($name>>32)";
			} else {
				push @args, "uintptr($name)";
			}
		} elsif($type eq "int64" && $dragonfly) {
			if ($func !~ /^extp(read|write)/i) {
				push @args, "0";
			}
			if($_32bit eq "big-endian") {
				push @args, "uintptr($name>>32)", "uintptr($name)";
			} elsif($_32bit eq "little-endian") {
				push @args, "uintptr($name)", "uintptr($name>>32)";
			} else {
				push @args, "uintptr($name)";
			}
		} elsif($type eq "int64" && $_32bit ne "") {
			if(@args % 2 && $arm) {
				# arm abi specifies 64-bit argument uses
				# (even, odd) pair
				push @args, "0"
			}
			if($_32bit eq "big-endian") {
				push @args, "uintptr($name>>32)", "uintptr($name)";
			} else {
				push @args, "uintptr($name)", "uintptr($name>>32)";
			}
		} else {
			push @args, "uintptr($name)";
		}
	}

# Determine which form to use; pad args with zeros.
	my $asm = "Syscall";
	if ($nonblock) {
		if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
			$asm = "rawSyscallNoError";
		} else {
			$asm = "RawSyscall";
		}
	}
	if ($libc) {
		# Call unexported syscall functions (which take
		# libc functions instead of syscall numbers).
		$asm = lcfirst($asm);
	}
	if(@args <= 3) {
		while(@args < 3) {
			push @args, "0";
		}
	} elsif(@args <= 6) {
		$asm .= "6";
		while(@args < 6) {
			push @args, "0";
		}
	} elsif(@args <= 9) {
		$asm .= "9";
		while(@args < 9) {
			push @args, "0";
		}
	} else {
		print STDERR "$ARGV:$.: too many arguments to system call\n";
	}

if ($darwin || ($openbsd && $libc)) {
		# Use extended versions for calls that generate a 64-bit result.
		my ($name, $type) = parseparam($out[0]);
		if ($type eq "int64" || ($type eq "uintptr" && $_32bit eq "")) {
			$asm .= "X";
		}
	}

# System call number.
	my $funcname = "";
	if($sysname eq "") {
		$sysname = "SYS_$func";
		$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;	# turn FooBar into Foo_Bar
		$sysname =~ y/a-z/A-Z/;
		if($libc) {
			$sysname =~ y/A-Z/a-z/;
			$sysname = substr $sysname, 4;
			$funcname = "libc_$sysname";
		}
	}
	if($libc) {
		if($funcname eq "") {
			$sysname = substr $sysname, 4;
			$funcname = "libc_$sysname";
		}
		$sysname = "abi.FuncPCABI0(${funcname}_trampoline)";
	}

# Actual call.
	my $args = join(', ', @args);
	my $call = "$asm($sysname, $args)";

# Assign return values.
	my $body = "";
	my @ret = ("_", "_", "_");
	my $do_errno = 0;
	for(my $i=0; $i<@out; $i++) {
		my $p = $out[$i];
		my ($name, $type) = parseparam($p);
		my $reg = "";
		if($name eq "err" && !$plan9) {
			$reg = "e1";
			$ret[2] = $reg;
			$do_errno = 1;
		} elsif($name eq "err" && $plan9) {
			$ret[0] = "r0";
			$ret[2] = "e1";
			next;
		} else {
			$reg = sprintf("r%d", $i);
			$ret[$i] = $reg;
		}
		if($type eq "bool") {
			$reg = "$reg != 0";
		}
		if($type eq "int64" && $_32bit ne "") {
			# 64-bit number in r1:r0 or r0:r1.
			if($i+2 > @out) {
				print STDERR "$ARGV:$.: not enough registers for int64 return\n";
			}
			if($_32bit eq "big-endian") {
				$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
			} else {
				$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
			}
			$ret[$i] = sprintf("r%d", $i);
			$ret[$i+1] = sprintf("r%d", $i+1);
		}
		if($reg ne "e1" || $plan9) {
			$body .= "\t$name = $type($reg)\n";
		}
	}
	if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
		$text .= "\t$call\n";
	} else {
		if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
			# raw syscall without error on Linux, see golang.org/issue/22924
			$text .= "\t$ret[0], $ret[1] := $call\n";
		} else {
			$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
		}
	}
	$text .= $body;

if ($plan9 && $ret[2] eq "e1") {
		$text .= "\tif int32(r0) == -1 {\n";
		$text .= "\t\terr = e1\n";
		$text .= "\t}\n";
	} elsif ($do_errno) {
		$text .= "\tif e1 != 0 {\n";
		$text .= "\t\terr = errnoErr(e1)\n";
		$text .= "\t}\n";
	}
	$text .= "\treturn\n";
	$text .= "}\n\n";
	if($libc) {
		if (not exists $trampolines{$funcname}) {
			$trampolines{$funcname} = 1;
			# The assembly trampoline that jumps to the libc routine.
			$text .= "func ${funcname}_trampoline()\n\n";
			# Tell the linker that funcname can be found in libSystem using varname without the libc_ prefix.
			my $basename = substr $funcname, 5;
			my $libc = "libc.so";
			if ($darwin) {
				$libc = "/usr/lib/libSystem.B.dylib";
			}
			$text .= "//go:cgo_import_dynamic $funcname $basename \"$libc\"\n\n";
		}
	}
}

chomp $text;
chomp $text;

if($errors) {
	exit 1;
}

# TODO: this assumes tags are just simply comma separated. For now this is all the uses.
$newtags = $tags =~ s/,/ && /r;

print <<EOF;
// $cmdline
// Code generated by the command above; DO NOT EDIT.

//go:build $newtags
// +build $tags

package syscall

import "unsafe"
$extraimports

$text
EOF
exit 0;

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