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|
#!/usr/bin/env perl
# require 'x86asm.pl';
# &asm_init(<flavor>,"des-586.pl"[,$i386only]);
# &function_begin("foo");
# ...
# &function_end("foo");
# &asm_finish
$out=();
$i386=0;
# AUTOLOAD is this context has quite unpleasant side effect, namely
# that typos in function calls effectively go to assembler output,
# but on the pros side we don't have to implement one subroutine per
# each opcode...
sub ::AUTOLOAD
{ my $opcode = $AUTOLOAD;
die "more than 4 arguments passed to $opcode" if ($#_>3);
$opcode =~ s/.*:://;
if ($opcode =~ /^push/) { $stack+=4; }
elsif ($opcode =~ /^pop/) { $stack-=4; }
&generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
}
sub ::emit
{ my $opcode=shift;
if ($#_==-1) { push(@out,"\t$opcode\n"); }
else { push(@out,"\t$opcode\t".join(',',@_)."\n"); }
}
sub ::LB
{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
$1."l";
}
sub ::HB
{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
$1."h";
}
sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); }
sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); }
sub ::blindpop { &pop($_[0]); $stack+=4; }
sub ::wparam { &DWP($stack+4*$_[0],"esp"); }
sub ::swtmp { &DWP(4*$_[0],"esp"); }
sub ::bswap
{ if ($i386) # emulate bswap for i386
{ &comment("bswap @_");
&xchg(&HB(@_),&LB(@_));
&ror (@_,16);
&xchg(&HB(@_),&LB(@_));
}
else
{ &generic("bswap",@_); }
}
# These are made-up opcodes introduced over the years essentially
# by ignorance, just alias them to real ones...
sub ::movb { &mov(@_); }
sub ::xorb { &xor(@_); }
sub ::rotl { &rol(@_); }
sub ::rotr { &ror(@_); }
sub ::exch { &xchg(@_); }
sub ::halt { &hlt; }
sub ::movz { &movzx(@_); }
sub ::pushf { &pushfd; }
sub ::popf { &popfd; }
# 3 argument instructions
sub ::movq
{ my($p1,$p2,$optimize)=@_;
if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
# movq between mmx registers can sink Intel CPUs
{ &::pshufw($p1,$p2,0xe4); }
else
{ &::generic("movq",@_); }
}
# label management
$lbdecor="L"; # local label decoration, set by package
$label="000";
sub ::islabel # see is argument is a known label
{ my $i;
foreach $i (values %label) { return $i if ($i eq $_[0]); }
$label{$_[0]}; # can be undef
}
sub ::label # instantiate a function-scope label
{ if (!defined($label{$_[0]}))
{ $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; }
$label{$_[0]};
}
sub ::LABEL # instantiate a file-scope label
{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
$label{$_[0]};
}
sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); }
sub ::set_label_B { push(@out,"@_:\n"); }
sub ::set_label
{ my $label=&::label($_[0]);
&::align($_[1]) if ($_[1]>1);
&::set_label_B($label);
$label;
}
sub ::wipe_labels # wipes function-scope labels
{ foreach $i (keys %label)
{ delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
}
# subroutine management
sub ::function_begin
{ &function_begin_B(@_);
$stack=4;
&push("ebp");
&push("ebx");
&push("esi");
&push("edi");
}
sub ::function_end
{ &pop("edi");
&pop("esi");
&pop("ebx");
&pop("ebp");
&ret();
&function_end_B(@_);
$stack=0;
&wipe_labels();
}
sub ::function_end_A
{ &pop("edi");
&pop("esi");
&pop("ebx");
&pop("ebp");
&ret();
$stack+=16; # readjust esp as if we didn't pop anything
}
sub ::asciz
{ my @str=unpack("C*",shift);
push @str,0;
while ($#str>15) {
&data_byte(@str[0..15]);
foreach (0..15) { shift @str; }
}
&data_byte(@str) if (@str);
}
sub ::asm_finish
{ &file_end();
print @out;
}
sub ::asm_init
{ my ($type,$fn,$cpu)=@_;
$filename=$fn;
$i386=$cpu;
$elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=0;
if (($type eq "elf"))
{ $elf=1; require "x86gas.pl"; }
elsif (($type eq "a\.out"))
{ $aout=1; require "x86gas.pl"; }
elsif (($type eq "coff" or $type eq "gaswin"))
{ $coff=1; require "x86gas.pl"; }
elsif (($type eq "win32n"))
{ $win32=1; require "x86nasm.pl"; }
elsif (($type eq "nw-nasm"))
{ $netware=1; require "x86nasm.pl"; }
#elsif (($type eq "nw-mwasm"))
#{ $netware=1; $mwerks=1; require "x86nasm.pl"; }
elsif (($type eq "win32"))
{ $win32=1; require "x86masm.pl"; }
elsif (($type eq "macosx"))
{ $aout=1; $macosx=1; require "x86gas.pl"; }
else
{ print STDERR <<"EOF";
Pick one target type from
elf - Linux, FreeBSD, Solaris x86, etc.
a.out - DJGPP, elder OpenBSD, etc.
coff - GAS/COFF such as Win32 targets
win32n - Windows 95/Windows NT NASM format
nw-nasm - NetWare NASM format
macosx - Mac OS X
EOF
exit(1);
}
$pic=0;
for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
$filename =~ s/\.pl$//;
&file($filename);
}
1;
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