1#! /usr/bin/env perl
2# Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the OpenSSL license (the "License").  You may not use
5# this file except in compliance with the License.  You can obtain a copy
6# in the file LICENSE in the source distribution or at
7# https://www.openssl.org/source/license.html
8
9use strict;
10
11my $flavour = shift;
12my $output = shift;
13open STDOUT,">$output" || die "can't open $output: $!";
14
15$flavour = "linux32" if (!$flavour or $flavour eq "void");
16
17my %GLOBALS;
18my $dotinlocallabels=($flavour=~/linux/)?1:0;
19
20################################################################
21# directives which need special treatment on different platforms
22################################################################
23my $arch = sub {
24    if ($flavour =~ /linux/)	{ ".arch\t".join(',',@_); }
25    else			{ ""; }
26};
27my $fpu = sub {
28    if ($flavour =~ /linux/)	{ ".fpu\t".join(',',@_); }
29    else			{ ""; }
30};
31my $hidden = sub {
32    if ($flavour =~ /ios/)	{ ".private_extern\t".join(',',@_); }
33    else			{ ".hidden\t".join(',',@_); }
34};
35my $comm = sub {
36    my @args = split(/,\s*/,shift);
37    my $name = @args[0];
38    my $global = \$GLOBALS{$name};
39    my $ret;
40
41    if ($flavour =~ /ios32/)	{
42	$ret = ".comm\t_$name,@args[1]\n";
43	$ret .= ".non_lazy_symbol_pointer\n";
44	$ret .= "$name:\n";
45	$ret .= ".indirect_symbol\t_$name\n";
46	$ret .= ".long\t0";
47	$name = "_$name";
48    } else			{ $ret = ".comm\t".join(',',@args); }
49
50    $$global = $name;
51    $ret;
52};
53my $globl = sub {
54    my $name = shift;
55    my $global = \$GLOBALS{$name};
56    my $ret;
57
58    SWITCH: for ($flavour) {
59	/ios/		&& do { $name = "_$name";
60				last;
61			      };
62    }
63
64    $ret = ".globl	$name" if (!$ret);
65    $$global = $name;
66    $ret;
67};
68my $global = $globl;
69my $extern = sub {
70    &$globl(@_);
71    return;	# return nothing
72};
73my $type = sub {
74    if ($flavour =~ /linux/)	{ ".type\t".join(',',@_); }
75    elsif ($flavour =~ /ios32/)	{ if (join(',',@_) =~ /(\w+),%function/) {
76					"#ifdef __thumb2__\n".
77					".thumb_func	$1\n".
78					"#endif";
79				  }
80			        }
81    else			{ ""; }
82};
83my $size = sub {
84    if ($flavour =~ /linux/)	{ ".size\t".join(',',@_); }
85    else			{ ""; }
86};
87my $inst = sub {
88    if ($flavour =~ /linux/)    { ".inst\t".join(',',@_); }
89    else                        { ".long\t".join(',',@_); }
90};
91my $asciz = sub {
92    my $line = join(",",@_);
93    if ($line =~ /^"(.*)"$/)
94    {	".byte	" . join(",",unpack("C*",$1),0) . "\n.align	2";	}
95    else
96    {	"";	}
97};
98
99sub range {
100  my ($r,$sfx,$start,$end) = @_;
101
102    join(",",map("$r$_$sfx",($start..$end)));
103}
104
105sub expand_line {
106  my $line = shift;
107  my @ret = ();
108
109    pos($line)=0;
110
111    while ($line =~ m/\G[^@\/\{\"]*/g) {
112	if ($line =~ m/\G(@|\/\/|$)/gc) {
113	    last;
114	}
115	elsif ($line =~ m/\G\{/gc) {
116	    my $saved_pos = pos($line);
117	    $line =~ s/\G([rdqv])([0-9]+)([^\-]*)\-\1([0-9]+)\3/range($1,$3,$2,$4)/e;
118	    pos($line) = $saved_pos;
119	    $line =~ m/\G[^\}]*\}/g;
120	}
121	elsif ($line =~ m/\G\"/gc) {
122	    $line =~ m/\G[^\"]*\"/g;
123	}
124    }
125
126    $line =~ s/\b(\w+)/$GLOBALS{$1} or $1/ge;
127
128    return $line;
129}
130
131while(my $line=<>) {
132
133    if ($line =~ m/^\s*(#|@|\/\/)/)	{ print $line; next; }
134
135    $line =~ s|/\*.*\*/||;	# get rid of C-style comments...
136    $line =~ s|^\s+||;		# ... and skip white spaces in beginning...
137    $line =~ s|\s+$||;		# ... and at the end
138
139    {
140	$line =~ s|[\b\.]L(\w{2,})|L$1|g;	# common denominator for Locallabel
141	$line =~ s|\bL(\w{2,})|\.L$1|g	if ($dotinlocallabels);
142    }
143
144    {
145	$line =~ s|(^[\.\w]+)\:\s*||;
146	my $label = $1;
147	if ($label) {
148	    printf "%s:",($GLOBALS{$label} or $label);
149	}
150    }
151
152    if ($line !~ m/^[#@]/) {
153	$line =~ s|^\s*(\.?)(\S+)\s*||;
154	my $c = $1; $c = "\t" if ($c eq "");
155	my $mnemonic = $2;
156	my $opcode;
157	if ($mnemonic =~ m/([^\.]+)\.([^\.]+)/) {
158	    $opcode = eval("\$$1_$2");
159	} else {
160	    $opcode = eval("\$$mnemonic");
161	}
162
163	my $arg=expand_line($line);
164
165	if (ref($opcode) eq 'CODE') {
166		$line = &$opcode($arg);
167	} elsif ($mnemonic)         {
168		$line = $c.$mnemonic;
169		$line.= "\t$arg" if ($arg ne "");
170	}
171    }
172
173    print $line if ($line);
174    print "\n";
175}
176
177close STDOUT;
178