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|
#!/usr/bin/env perl
# PowerPC assembler distiller by <appro>.
my $output = shift;
open STDOUT,">$output" || die "can't open $output: $!";
my $flavour = $output;
my %GLOBALS;
my $dotinlocallabels=($flavour=~/linux/)?1:0;
################################################################
# directives which need special treatment on different platforms
################################################################
my $globl = sub {
my $junk = shift;
my $name = shift;
my $global = \$GLOBALS{$name};
my $ret;
$name =~ s|^[\.\_]||;
SWITCH: for ($flavour) {
/aix/ && do { $name = ".$name";
last;
};
/osx/ && do { $name = "_$name";
last;
};
/linux.*32/ && do { $ret .= ".globl $name\n";
$ret .= ".type $name,\@function";
last;
};
/linux.*64/ && do { $ret .= ".globl .$name\n";
$ret .= ".type .$name,\@function\n";
$ret .= ".section \".opd\",\"aw\"\n";
$ret .= ".globl $name\n";
$ret .= ".align 3\n";
$ret .= "$name:\n";
$ret .= ".quad .$name,.TOC.\@tocbase,0\n";
$ret .= ".size $name,24\n";
$ret .= ".previous\n";
$name = ".$name";
last;
};
}
$ret = ".globl $name" if (!$ret);
$$global = $name;
$ret;
};
my $text = sub {
($flavour =~ /aix/) ? ".csect" : ".text";
};
my $machine = sub {
my $junk = shift;
my $arch = shift;
if ($flavour =~ /osx/)
{ $arch =~ s/\"//g;
$arch = ($flavour=~/64/) ? "ppc970-64" : "ppc970" if ($arch eq "any");
}
".machine $arch";
};
my $asciz = sub {
shift;
my $line = join(",",@_);
if ($line =~ /^"(.*)"$/)
{ ".byte " . join(",",unpack("C*",$1),0); }
else
{ ""; }
};
################################################################
# simplified mnemonics not handled by at least one assembler
################################################################
my $cmplw = sub {
my $f = shift;
my $cr = 0; $cr = shift if ($#_>1);
# Some out-of-date 32-bit GNU assembler just can't handle cmplw...
($flavour =~ /linux.*32/) ?
" .long ".sprintf "0x%x",31<<26|$cr<<23|$_[0]<<16|$_[1]<<11|64 :
" cmplw ".join(',',$cr,@_);
};
my $bdnz = sub {
my $f = shift;
my $bo = $f=~/[\+\-]/ ? 17 : 16;
" bc $bo,0,".shift;
};
while($line=<>) {
$line =~ s|[#!;].*$||; # get rid of asm-style comments...
$line =~ s|/\*.*\*/||; # ... and C-style comments...
$line =~ s|^\s+||; # ... and skip white spaces in beginning...
$line =~ s|\s+$||; # ... and at the end
{
$line =~ s|\b\.L(\w+)|L$1|g; # common denominator for Locallabel
$line =~ s|\bL(\w+)|\.L$1|g if ($dotinlocallabels);
}
{
$line =~ s|(^[\.\w]+)\:\s*||;
my $label = $1;
printf "%s:",($GLOBALS{$label} or $label) if ($label);
}
{
$line =~ s|^\s*(\.?)(\w+)([\.\+\-]?)\s*||;
my $c = $1; $c = "\t" if ($c eq "");
my $mnemonic = $2;
my $f = $3;
my $opcode = eval("\$$mnemonic");
$line =~ s|\bc?r([0-9]+)\b|$1|g if ($c ne "." and $flavour !~ /osx/);
if (ref($opcode) eq 'CODE') { $line = &$opcode($f,split(',',$line)); }
elsif ($mnemonic) { $line = $c.$mnemonic.$f."\t".$line; }
}
print $line if ($line);
print "\n";
}
close STDOUT;
|
