mirror of
https://github.com/golang/go
synced 2024-10-05 10:31:22 -06:00
9feee91d79
also fix echo bug that just surfaced in mkerrors.sh R=r DELTA=67 (11 added, 19 deleted, 37 changed) OCL=33743 CL=33757
180 lines
4.3 KiB
Bash
Executable File
180 lines
4.3 KiB
Bash
Executable File
#!/usr/bin/perl
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# Copyright 2009 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# This program reads a file containing function prototypes
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# (like syscall_darwin.go) and generates system call bodies.
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# The prototypes are marked by lines beginning with "//sys"
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# and read like func declarations if //sys is replaced by func, but:
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# * The parameter lists must give a name for each argument.
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# This includes return parameters.
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# * The parameter lists must give a type for each argument:
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# the (x, y, z int) shorthand is not allowed.
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# * If the return parameter is an error number, it must be named errno.
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$cmdline = "mksyscall.sh " . join(' ', @ARGV);
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$errors = 0;
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$_32bit = "";
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if($ARGV[0] eq "-b32") {
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$_32bit = "big-endian";
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shift;
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} elsif($ARGV[0] eq "-l32") {
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$_32bit = "little-endian";
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shift;
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}
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if($ARGV[0] =~ /^-/) {
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print STDERR "usage: mksyscall.sh [-b32 | -l32] [file ...]\n";
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exit 1;
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}
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sub parseparamlist($) {
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my ($list) = @_;
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$list =~ s/^\s*//;
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$list =~ s/\s*$//;
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if($list eq "") {
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return ();
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}
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return split(/\s*,\s*/, $list);
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}
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sub parseparam($) {
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my ($p) = @_;
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if($p !~ /^(\S*) (\S*)$/) {
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print STDERR "$ARGV:$.: malformed parameter: $p\n";
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$errors = 1;
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return ("xx", "int");
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}
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return ($1, $2);
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}
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$text = "";
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while(<>) {
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chomp;
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s/\s+/ /g;
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s/^\s+//;
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s/\s+$//;
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next if !/^\/\/sys /;
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# Line must be of the form
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# func Open(path string, mode int, perm int) (fd int, errno int)
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# Split into name, in params, out params.
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if(!/^\/\/sys (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(SYS_[A-Z0-9_]+))?$/) {
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print STDERR "$ARGV:$.: malformed //sys declaration\n";
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$errors = 1;
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next;
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}
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my ($func, $in, $out, $sysname) = ($1, $2, $3, $4);
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# Split argument lists on comma.
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my @in = parseparamlist($in);
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my @out = parseparamlist($out);
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# Go function header.
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$text .= sprintf "func %s(%s) (%s) {\n", $func, join(', ', @in), join(', ', @out);
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# Prepare arguments to Syscall.
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my @args = ();
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my $n = 0;
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foreach my $p (@in) {
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my ($name, $type) = parseparam($p);
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if($type =~ /^\*/) {
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push @args, "uintptr(unsafe.Pointer($name))";
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} elsif($type eq "string") {
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push @args, "uintptr(unsafe.Pointer(StringBytePtr($name)))";
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} elsif($type =~ /^\[\](.*)/) {
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# Convert slice into pointer, length.
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# Have to be careful not to take address of &a[0] if len == 0:
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# pass nil in that case.
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$text .= "\tvar _p$n *$1;\n";
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$text .= "\tif len($name) > 0 { _p$n = \&${name}[0]; }\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))";
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$n++;
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} elsif($type eq "int64" && $_32bit ne "") {
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if($_32bit eq "big-endian") {
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push @args, "uintptr($name >> 32)", "uintptr($name)";
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} else {
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push @args, "uintptr($name)", "uintptr($name >> 32)";
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}
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} else {
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push @args, "uintptr($name)";
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}
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}
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# Determine which form to use; pad args with zeros.
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my $asm = "Syscall";
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if(@args <= 3) {
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while(@args < 3) {
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push @args, "0";
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}
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} elsif(@args <= 6) {
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$asm = "Syscall6";
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while(@args < 6) {
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push @args, "0";
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}
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} else {
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print STDERR "$ARGV:$.: too many arguments to system call\n";
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}
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# System call number.
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if($sysname eq "") {
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$sysname = "SYS_$func";
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$sysname =~ s/([a-z])([A-Z])/${1}_$2/g; # turn FooBar into Foo_Bar
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$sysname =~ y/a-z/A-Z/;
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}
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# Actual call.
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my $args = join(', ', @args);
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$text .= "\tr0, r1, e1 := $asm($sysname, $args);\n";
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# Assign return values.
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for(my $i=0; $i<@out; $i++) {
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my $p = $out[$i];
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my ($name, $type) = parseparam($p);
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my $reg = "";
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if($name eq "errno") {
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$reg = "e1";
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} else {
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$reg = sprintf("r%d", $i);
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}
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if($type eq "bool") {
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$reg = "$reg != 0";
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}
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if($type eq "int64" && $_32bit ne "") {
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# 64-bit number in r1:r0 or r0:r1.
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if($i+2 > @out) {
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print STDERR "$ARGV:$.: not enough registers for int64 return\n";
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}
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if($_32bit eq "big-endian") {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
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} else {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
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}
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$i++; # loop will do another $i++
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}
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$text .= "\t$name = $type($reg);\n";
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}
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$text .= "\treturn;\n";
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$text .= "}\n\n";
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}
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if($errors) {
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exit 1;
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}
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print <<EOF;
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// $cmdline
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// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
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package syscall
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import "unsafe"
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$text
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EOF
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exit 0;
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