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|
#!/usr/local/bin/perl
package x86ms;
$label="L000";
%lb=( 'eax', 'al',
'ebx', 'bl',
'ecx', 'cl',
'edx', 'dl',
'ax', 'al',
'bx', 'bl',
'cx', 'cl',
'dx', 'dl',
);
%hb=( 'eax', 'ah',
'ebx', 'bh',
'ecx', 'ch',
'edx', 'dh',
'ax', 'ah',
'bx', 'bh',
'cx', 'ch',
'dx', 'dh',
);
sub main'LB
{
(defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n";
return($lb{$_[0]});
}
sub main'HB
{
(defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n";
return($hb{$_[0]});
}
sub main'DWP
{
local($addr,$reg1,$reg2,$idx)=@_;
local($t);
local($ret)="DWORD PTR ";
$addr =~ s/^\s+//;
if ($addr =~ /^(.+)\+(.+)$/)
{
$reg2=&conv($1);
$addr="_$2";
}
elsif ($addr =~ /^[_a-zA-Z]/)
{
$addr="_$addr";
}
$reg1="$regs{$reg1}" if defined($regs{$reg1});
$reg2="$regs{$reg2}" if defined($regs{$reg2});
$ret.=$addr if ($addr ne "") && ($addr ne 0);
if ($reg2 ne "")
{
$t="";
$t="*$idx" if ($idx != 0);
$ret.="[$reg2$t+$reg1]";
}
else
{
$ret.="[$reg1]"
}
return($ret);
}
sub main'mov { &out2("mov",@_); }
sub main'movb { &out2("mov",@_); }
sub main'and { &out2("and",@_); }
sub main'or { &out2("or",@_); }
sub main'shl { &out2("shl",@_); }
sub main'shr { &out2("shr",@_); }
sub main'xor { &out2("xor",@_); }
sub main'add { &out2("add",@_); }
sub main'sub { &out2("sub",@_); }
sub main'rotl { &out2("rol",@_); }
sub main'rotr { &out2("ror",@_); }
sub main'exch { &out2("xchg",@_); }
sub main'cmp { &out2("cmp",@_); }
sub main'dec { &out1("dec",@_); }
sub main'jmp { &out1("jmp",@_); }
sub main'je { &out1("je",@_); }
sub main'jz { &out1("jz",@_); }
sub main'jnz { &out1("jnz",@_); }
sub main'push { &out1("push",@_); }
sub main'call { &out1("call",'_'.$_[0]); }
sub out2
{
local($name,$p1,$p2)=@_;
local($l,$t);
print "\t$name\t";
$t=&conv($p1).",";
$l=length($t);
print $t;
$l=4-($l+9)/8;
print "\t" x $l;
print &conv($p2);
print "\n";
}
sub out1
{
local($name,$p1)=@_;
local($l,$t);
print "\t$name\t";
print &conv($p1);
print "\n";
}
sub conv
{
local($p)=@_;
$p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
return $p;
}
sub main'file
{
local($file)=@_;
print <<"EOF";
TITLE $file.asm
.386
.model FLAT
EOF
}
sub main'function_begin
{
local($func,$num,$extra)=@_;
$params=$num*4;
print <<"EOF";
_TEXT SEGMENT
PUBLIC _$func
$extra
_$func PROC NEAR
push ebp
push ebx
push esi
push edi
EOF
$stack=20;
}
sub main'function_end
{
local($func)=@_;
print <<"EOF";
pop edi
pop esi
pop ebx
pop ebp
ret
_$func ENDP
_TEXT ENDS
EOF
$stack=0;
%label=();
}
sub main'function_end_A
{
local($func)=@_;
print <<"EOF";
pop edi
pop esi
pop ebx
pop ebp
ret
EOF
}
sub main'function_end_B
{
local($func)=@_;
print <<"EOF";
_$func ENDP
_TEXT ENDS
EOF
$stack=0;
%label=();
}
sub main'file_end
{
print "END\n"
}
sub main'wparam
{
local($num)=@_;
return(&main'DWP($stack+$num*4,"esp","",0));
}
sub main'wtmp
{
local($num)=@_;
return(&main'DWP($stack+$params+$num*4,"esp","",0));
}
sub main'comment
{
foreach (@_)
{
print "\t; $_\n";
}
}
sub main'label
{
if (!defined($label{$_[0]}))
{
$label{$_[0]}="\$${label}${_[0]}";
$label++;
}
return($label{$_[0]});
}
sub main'set_label
{
if (!defined($label{$_[0]}))
{
$label{$_[0]}="${label}${_[0]}";
$label++;
}
print "$label{$_[0]}:\n";
}
sub main'file_end
{
print "END\n";
}
|
