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9b12e4fe JC |
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 | ||
6 | # This program reads a file containing function prototypes | |
7 | # (like syscall_solaris.go) and generates system call bodies. | |
8 | # The prototypes are marked by lines beginning with "//sys" | |
9 | # and read like func declarations if //sys is replaced by func, but: | |
10 | # * The parameter lists must give a name for each argument. | |
11 | # This includes return parameters. | |
12 | # * The parameter lists must give a type for each argument: | |
13 | # the (x, y, z int) shorthand is not allowed. | |
14 | # * If the return parameter is an error number, it must be named err. | |
15 | # * If go func name needs to be different than its libc name, | |
16 | # * or the function is not in libc, name could be specified | |
17 | # * at the end, after "=" sign, like | |
18 | # //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt | |
19 | ||
20 | use strict; | |
21 | ||
22 | my $cmdline = "mksyscall_solaris.pl " . join(' ', @ARGV); | |
23 | my $errors = 0; | |
24 | my $_32bit = ""; | |
25 | ||
26 | binmode STDOUT; | |
27 | ||
28 | if($ARGV[0] eq "-b32") { | |
29 | $_32bit = "big-endian"; | |
30 | shift; | |
31 | } elsif($ARGV[0] eq "-l32") { | |
32 | $_32bit = "little-endian"; | |
33 | shift; | |
34 | } | |
35 | ||
36 | if($ARGV[0] =~ /^-/) { | |
37 | print STDERR "usage: mksyscall_solaris.pl [-b32 | -l32] [file ...]\n"; | |
38 | exit 1; | |
39 | } | |
40 | ||
41 | if($ENV{'GOARCH'} eq "" || $ENV{'GOOS'} eq "") { | |
42 | print STDERR "GOARCH or GOOS not defined in environment\n"; | |
43 | exit 1; | |
44 | } | |
45 | ||
46 | sub parseparamlist($) { | |
47 | my ($list) = @_; | |
48 | $list =~ s/^\s*//; | |
49 | $list =~ s/\s*$//; | |
50 | if($list eq "") { | |
51 | return (); | |
52 | } | |
53 | return split(/\s*,\s*/, $list); | |
54 | } | |
55 | ||
56 | sub parseparam($) { | |
57 | my ($p) = @_; | |
58 | if($p !~ /^(\S*) (\S*)$/) { | |
59 | print STDERR "$ARGV:$.: malformed parameter: $p\n"; | |
60 | $errors = 1; | |
61 | return ("xx", "int"); | |
62 | } | |
63 | return ($1, $2); | |
64 | } | |
65 | ||
66 | my $package = ""; | |
67 | my $text = ""; | |
68 | my $dynimports = ""; | |
69 | my $linknames = ""; | |
70 | my @vars = (); | |
71 | while(<>) { | |
72 | chomp; | |
73 | s/\s+/ /g; | |
74 | s/^\s+//; | |
75 | s/\s+$//; | |
76 | $package = $1 if !$package && /^package (\S+)$/; | |
77 | my $nonblock = /^\/\/sysnb /; | |
78 | next if !/^\/\/sys / && !$nonblock; | |
79 | ||
80 | # Line must be of the form | |
81 | # func Open(path string, mode int, perm int) (fd int, err error) | |
82 | # Split into name, in params, out params. | |
83 | if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) { | |
84 | print STDERR "$ARGV:$.: malformed //sys declaration\n"; | |
85 | $errors = 1; | |
86 | next; | |
87 | } | |
88 | my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6); | |
89 | ||
90 | # Split argument lists on comma. | |
91 | my @in = parseparamlist($in); | |
92 | my @out = parseparamlist($out); | |
93 | ||
94 | # So file name. | |
95 | if($modname eq "") { | |
96 | $modname = "libc"; | |
97 | } | |
98 | ||
99 | # System call name. | |
100 | if($sysname eq "") { | |
101 | $sysname = "$func"; | |
102 | } | |
103 | ||
104 | # System call pointer variable name. | |
105 | my $sysvarname = "proc$sysname"; | |
106 | ||
107 | my $strconvfunc = "BytePtrFromString"; | |
108 | my $strconvtype = "*byte"; | |
109 | ||
110 | $sysname =~ y/A-Z/a-z/; # All libc functions are lowercase. | |
111 | ||
112 | # Runtime import of function to allow cross-platform builds. | |
113 | $dynimports .= "//go:cgo_import_dynamic libc_${sysname} ${sysname} \"$modname.so\"\n"; | |
114 | # Link symbol to proc address variable. | |
115 | $linknames .= "//go:linkname ${sysvarname} libc_${sysname}\n"; | |
116 | # Library proc address variable. | |
117 | push @vars, $sysvarname; | |
118 | ||
119 | # Go function header. | |
120 | $out = join(', ', @out); | |
121 | if($out ne "") { | |
122 | $out = " ($out)"; | |
123 | } | |
124 | if($text ne "") { | |
125 | $text .= "\n" | |
126 | } | |
127 | $text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out; | |
128 | ||
129 | # Check if err return available | |
130 | my $errvar = ""; | |
131 | foreach my $p (@out) { | |
132 | my ($name, $type) = parseparam($p); | |
133 | if($type eq "error") { | |
134 | $errvar = $name; | |
135 | last; | |
136 | } | |
137 | } | |
138 | ||
139 | # Prepare arguments to Syscall. | |
140 | my @args = (); | |
141 | my @uses = (); | |
142 | my $n = 0; | |
143 | foreach my $p (@in) { | |
144 | my ($name, $type) = parseparam($p); | |
145 | if($type =~ /^\*/) { | |
146 | push @args, "uintptr(unsafe.Pointer($name))"; | |
147 | } elsif($type eq "string" && $errvar ne "") { | |
148 | $text .= "\tvar _p$n $strconvtype\n"; | |
149 | $text .= "\t_p$n, $errvar = $strconvfunc($name)\n"; | |
150 | $text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n"; | |
151 | push @args, "uintptr(unsafe.Pointer(_p$n))"; | |
152 | push @uses, "use(unsafe.Pointer(_p$n))"; | |
153 | $n++; | |
154 | } elsif($type eq "string") { | |
155 | print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n"; | |
156 | $text .= "\tvar _p$n $strconvtype\n"; | |
157 | $text .= "\t_p$n, _ = $strconvfunc($name)\n"; | |
158 | push @args, "uintptr(unsafe.Pointer(_p$n))"; | |
159 | push @uses, "use(unsafe.Pointer(_p$n))"; | |
160 | $n++; | |
161 | } elsif($type =~ /^\[\](.*)/) { | |
162 | # Convert slice into pointer, length. | |
163 | # Have to be careful not to take address of &a[0] if len == 0: | |
164 | # pass nil in that case. | |
165 | $text .= "\tvar _p$n *$1\n"; | |
166 | $text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n"; | |
167 | push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))"; | |
168 | $n++; | |
169 | } elsif($type eq "int64" && $_32bit ne "") { | |
170 | if($_32bit eq "big-endian") { | |
171 | push @args, "uintptr($name >> 32)", "uintptr($name)"; | |
172 | } else { | |
173 | push @args, "uintptr($name)", "uintptr($name >> 32)"; | |
174 | } | |
175 | } elsif($type eq "bool") { | |
176 | $text .= "\tvar _p$n uint32\n"; | |
177 | $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n"; | |
178 | push @args, "uintptr(_p$n)"; | |
179 | $n++; | |
180 | } else { | |
181 | push @args, "uintptr($name)"; | |
182 | } | |
183 | } | |
184 | my $nargs = @args; | |
185 | ||
186 | # Determine which form to use; pad args with zeros. | |
187 | my $asm = "sysvicall6"; | |
188 | if ($nonblock) { | |
189 | $asm = "rawSysvicall6"; | |
190 | } | |
191 | if(@args <= 6) { | |
192 | while(@args < 6) { | |
193 | push @args, "0"; | |
194 | } | |
195 | } else { | |
196 | print STDERR "$ARGV:$.: too many arguments to system call\n"; | |
197 | } | |
198 | ||
199 | # Actual call. | |
200 | my $args = join(', ', @args); | |
201 | my $call = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $args)"; | |
202 | ||
203 | # Assign return values. | |
204 | my $body = ""; | |
205 | my $failexpr = ""; | |
206 | my @ret = ("_", "_", "_"); | |
207 | my @pout= (); | |
208 | my $do_errno = 0; | |
209 | for(my $i=0; $i<@out; $i++) { | |
210 | my $p = $out[$i]; | |
211 | my ($name, $type) = parseparam($p); | |
212 | my $reg = ""; | |
213 | if($name eq "err") { | |
214 | $reg = "e1"; | |
215 | $ret[2] = $reg; | |
216 | $do_errno = 1; | |
217 | } else { | |
218 | $reg = sprintf("r%d", $i); | |
219 | $ret[$i] = $reg; | |
220 | } | |
221 | if($type eq "bool") { | |
222 | $reg = "$reg != 0"; | |
223 | } | |
224 | if($type eq "int64" && $_32bit ne "") { | |
225 | # 64-bit number in r1:r0 or r0:r1. | |
226 | if($i+2 > @out) { | |
227 | print STDERR "$ARGV:$.: not enough registers for int64 return\n"; | |
228 | } | |
229 | if($_32bit eq "big-endian") { | |
230 | $reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1); | |
231 | } else { | |
232 | $reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i); | |
233 | } | |
234 | $ret[$i] = sprintf("r%d", $i); | |
235 | $ret[$i+1] = sprintf("r%d", $i+1); | |
236 | } | |
237 | if($reg ne "e1") { | |
238 | $body .= "\t$name = $type($reg)\n"; | |
239 | } | |
240 | } | |
241 | if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") { | |
242 | $text .= "\t$call\n"; | |
243 | } else { | |
244 | $text .= "\t$ret[0], $ret[1], $ret[2] := $call\n"; | |
245 | } | |
246 | foreach my $use (@uses) { | |
247 | $text .= "\t$use\n"; | |
248 | } | |
249 | $text .= $body; | |
250 | ||
251 | if ($do_errno) { | |
252 | $text .= "\tif e1 != 0 {\n"; | |
253 | $text .= "\t\terr = e1\n"; | |
254 | $text .= "\t}\n"; | |
255 | } | |
256 | $text .= "\treturn\n"; | |
257 | $text .= "}\n"; | |
258 | } | |
259 | ||
260 | if($errors) { | |
261 | exit 1; | |
262 | } | |
263 | ||
264 | print <<EOF; | |
265 | // $cmdline | |
266 | // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT | |
267 | ||
268 | // +build $ENV{'GOARCH'},$ENV{'GOOS'} | |
269 | ||
270 | package $package | |
271 | ||
272 | import ( | |
273 | "syscall" | |
274 | "unsafe" | |
275 | ) | |
276 | EOF | |
277 | ||
278 | print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix"; | |
279 | ||
280 | my $vardecls = "\t" . join(",\n\t", @vars); | |
281 | $vardecls .= " syscallFunc"; | |
282 | ||
283 | chomp($_=<<EOF); | |
284 | ||
285 | $dynimports | |
286 | $linknames | |
287 | var ( | |
288 | $vardecls | |
289 | ) | |
290 | ||
291 | $text | |
292 | EOF | |
293 | print $_; | |
294 | exit 0; |