Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
#!/usr/bin/env perl
package x86nasm;
*out=\@::out;
$::lbdecor="L\$"; # local label decoration
$nmdecor=$::netware?"":"_"; # external name decoration
$drdecor=$::mwerks?".":""; # directive decoration
$initseg="";
sub ::generic
{ my $opcode=shift;
my $tmp;
if (!$::mwerks)
{ if ($opcode =~ m/^j/o && $#_==0) # optimize jumps
{ $_[0] = "NEAR $_[0]"; }
elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea
{ $_[1] =~ s/^[^\[]*\[/\[/o; }
elsif ($opcode eq "clflush" && $#_==0)
{ $_[0] =~ s/^[^\[]*\[/\[/o; }
}
&::emit($opcode,@_);
1;
}
#
# opcodes not covered by ::generic above, mostly inconsistent namings...
#
sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
sub ::call_ptr { &::emit("call",@_); }
sub ::jmp_ptr { &::emit("jmp",@_); }
sub get_mem
{ my($size,$addr,$reg1,$reg2,$idx)=@_;
my($post,$ret);
if ($size ne "")
{ $ret .= "$size";
$ret .= " PTR" if ($::mwerks);
$ret .= " ";
}
$ret .= "[";
$addr =~ s/^\s+//;
# prepend global references with optional underscore
$addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige;
# put address arithmetic expression in parenthesis
$addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
if (($addr ne "") && ($addr ne 0))
{ if ($addr !~ /^-/) { $ret .= "$addr+"; }
else { $post=$addr; }
}
if ($reg2 ne "")
{ $idx!=0 or $idx=1;
$ret .= "$reg2*$idx";
$ret .= "+$reg1" if ($reg1 ne "");
}
else
{ $ret .= "$reg1"; }
$ret .= "$post]";
$ret =~ s/\+\]/]/; # in case $addr was the only argument
$ret;
}
sub ::BP { &get_mem("BYTE",@_); }
sub ::DWP { &get_mem("DWORD",@_); }
sub ::WP { &get_mem("WORD",@_); }
sub ::QWP { &get_mem("",@_); }
sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; }
sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; }
sub ::file
{ if ($::mwerks) { push(@out,".section\t.text,64\n"); }
else
{ my $tmp=<<___;
%ifidn __OUTPUT_FORMAT__,obj
section code use32 class=code align=64
%elifidn __OUTPUT_FORMAT__,win32
\$\@feat.00 equ 1
section .text code align=64
%else
section .text code
%endif
___
push(@out,$tmp);
}
}
sub ::function_begin_B
{ my $func=shift;
my $global=($func !~ /^_/);
my $begin="${::lbdecor}_${func}_begin";
$begin =~ s/^\@/./ if ($::mwerks); # the torture never stops
&::LABEL($func,$global?"$begin":"$nmdecor$func");
$func=$nmdecor.$func;
push(@out,"${drdecor}global $func\n") if ($global);
push(@out,"${drdecor}align 16\n");
push(@out,"$func:\n");
push(@out,"$begin:\n") if ($global);
$::stack=4;
}
sub ::function_end_B
{ $::stack=0;
&::wipe_labels();
}
sub ::file_end
{ if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
{ my $comm=<<___;
${drdecor}segment .bss
${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 8
___
# comment out OPENSSL_ia32cap_P declarations
grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
push (@out,$comm)
}
push (@out,$initseg) if ($initseg);
}
sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
sub ::external_label
{ foreach(@_)
{ push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); }
}
sub ::public_label
{ push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
sub ::data_byte
{ push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); }
sub ::data_short
{ push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); }
sub ::data_word
{ push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); }
sub ::align
{ push(@out,"${drdecor}align\t$_[0]\n"); }
sub ::picmeup
{ my($dst,$sym)=@_;
&::lea($dst,&::DWP($sym));
}
sub ::initseg
{ my $f=$nmdecor.shift;
if ($::win32)
{ $initseg=<<___;
segment .CRT\$XCU data align=4
extern $f
dd $f
___
}
}
sub ::dataseg
{ if ($mwerks) { push(@out,".section\t.data,4\n"); }
else { push(@out,"section\t.data align=4\n"); }
}
sub ::safeseh
{ my $nm=shift;
push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n");
push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n");
push(@out,"%endif\n");
}
1;