1#!/usr/bin/env perl
2
3package x86nasm;
4
5*out=\@::out;
6
7$::lbdecor="L\$";		# local label decoration
8$nmdecor=$::netware?"":"_";	# external name decoration
9$drdecor=$::mwerks?".":"";	# directive decoration
10
11$initseg="";
12
13sub ::generic
14{ my $opcode=shift;
15  my $tmp;
16
17    if (!$::mwerks)
18    {   if    ($opcode =~ m/^j/o && $#_==0) # optimize jumps
19	{   $_[0] = "NEAR $_[0]";   	}
20	elsif ($opcode eq "lea" && $#_==1)  # wipe storage qualifier from lea
21	{   $_[1] =~ s/^[^\[]*\[/\[/o;	}
22    }
23    &::emit($opcode,@_);
24  1;
25}
26#
27# opcodes not covered by ::generic above, mostly inconsistent namings...
28#
29sub ::call	{ &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
30sub ::call_ptr	{ &::emit("call",@_);	}
31sub ::jmp_ptr	{ &::emit("jmp",@_);	}
32
33sub get_mem
34{ my($size,$addr,$reg1,$reg2,$idx)=@_;
35  my($post,$ret);
36
37    if ($size ne "")
38    {	$ret .= "$size";
39	$ret .= " PTR" if ($::mwerks);
40	$ret .= " ";
41    }
42    $ret .= "[";
43
44    $addr =~ s/^\s+//;
45    # prepend global references with optional underscore
46    $addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige;
47    # put address arithmetic expression in parenthesis
48    $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
49
50    if (($addr ne "") && ($addr ne 0))
51    {	if ($addr !~ /^-/)	{ $ret .= "$addr+"; }
52	else			{ $post=$addr;      }
53    }
54
55    if ($reg2 ne "")
56    {	$idx!=0 or $idx=1;
57	$ret .= "$reg2*$idx";
58	$ret .= "+$reg1" if ($reg1 ne "");
59    }
60    else
61    {	$ret .= "$reg1";   }
62
63    $ret .= "$post]";
64    $ret =~ s/\+\]/]/; # in case $addr was the only argument
65
66  $ret;
67}
68sub ::BP	{ &get_mem("BYTE",@_);  }
69sub ::DWP	{ &get_mem("DWORD",@_); }
70sub ::QWP	{ &get_mem("",@_);      }
71sub ::BC	{ (($::mwerks)?"":"BYTE ")."@_";  }
72sub ::DWC	{ (($::mwerks)?"":"DWORD ")."@_"; }
73
74sub ::file
75{   if ($::mwerks)	{ push(@out,".section\t.text,64\n"); }
76    else
77    { my $tmp=<<___;
78%ifidn __OUTPUT_FORMAT__,obj
79section	code	use32 class=code align=64
80%elifidn __OUTPUT_FORMAT__,win32
81\$\@feat.00 equ 1
82section	.text	code align=64
83%else
84section	.text	code
85%endif
86___
87	push(@out,$tmp);
88    }
89}
90
91sub ::function_begin_B
92{ my $func=shift;
93  my $global=($func !~ /^_/);
94  my $begin="${::lbdecor}_${func}_begin";
95
96    $begin =~ s/^\@/./ if ($::mwerks);	# the torture never stops
97
98    &::LABEL($func,$global?"$begin":"$nmdecor$func");
99    $func=$nmdecor.$func;
100
101    push(@out,"${drdecor}global	$func\n")	if ($global);
102    push(@out,"${drdecor}align	16\n");
103    push(@out,"$func:\n");
104    push(@out,"$begin:\n")			if ($global);
105    $::stack=4;
106}
107
108sub ::function_end_B
109{   $::stack=0;
110    &::wipe_labels();
111}
112
113sub ::file_end
114{   if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
115    {	my $comm=<<___;
116${drdecor}segment	.bss
117${drdecor}common	${nmdecor}OPENSSL_ia32cap_P 4
118___
119	# comment out OPENSSL_ia32cap_P declarations
120	grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
121	push (@out,$comm)
122    }
123    push (@out,$initseg) if ($initseg);
124}
125
126sub ::comment {   foreach (@_) { push(@out,"\t; $_\n"); }   }
127
128sub ::external_label
129{   foreach(@_)
130    {	push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n");   }
131}
132
133sub ::public_label
134{   push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");  }
135
136sub ::data_byte
137{   push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n");	}
138
139sub ::data_word
140{   push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n");	}
141
142sub ::align
143{   push(@out,"${drdecor}align\t$_[0]\n");	}
144
145sub ::picmeup
146{ my($dst,$sym)=@_;
147    &::lea($dst,&::DWP($sym));
148}
149
150sub ::initseg
151{ my $f=$nmdecor.shift;
152    if ($::win32)
153    {	$initseg=<<___;
154segment	.CRT\$XCU data align=4
155extern	$f
156dd	$f
157___
158    }
159}
160
161sub ::dataseg
162{   if ($mwerks)	{ push(@out,".section\t.data,4\n");   }
163    else		{ push(@out,"section\t.data align=4\n"); }
164}
165
1661;
167