153 lines
4.2 KiB
Perl
153 lines
4.2 KiB
Perl
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#!/usr/bin/env perl
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# PowerPC assembler distiller by <appro>.
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my $flavour = shift;
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my $output = shift;
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open STDOUT,">$output" || die "can't open $output: $!";
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my %GLOBALS;
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my $dotinlocallabels=($flavour=~/linux/)?1:0;
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################################################################
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# directives which need special treatment on different platforms
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################################################################
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my $globl = sub {
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my $junk = shift;
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my $name = shift;
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my $global = \$GLOBALS{$name};
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my $ret;
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$name =~ s|^[\.\_]||;
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SWITCH: for ($flavour) {
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/aix/ && do { $name = ".$name";
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last;
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};
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/osx/ && do { $name = "_$name";
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last;
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};
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/linux.*32/ && do { $ret .= ".globl $name\n";
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$ret .= ".type $name,\@function";
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last;
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};
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/linux.*64/ && do { $ret .= ".globl .$name\n";
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$ret .= ".type .$name,\@function\n";
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$ret .= ".section \".opd\",\"aw\"\n";
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$ret .= ".globl $name\n";
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$ret .= ".align 3\n";
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$ret .= "$name:\n";
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$ret .= ".quad .$name,.TOC.\@tocbase,0\n";
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$ret .= ".size $name,24\n";
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$ret .= ".previous\n";
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$name = ".$name";
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last;
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};
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}
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$ret = ".globl $name" if (!$ret);
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$$global = $name;
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$ret;
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};
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my $text = sub {
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($flavour =~ /aix/) ? ".csect" : ".text";
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};
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my $machine = sub {
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my $junk = shift;
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my $arch = shift;
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if ($flavour =~ /osx/)
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{ $arch =~ s/\"//g;
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$arch = ($flavour=~/64/) ? "ppc970-64" : "ppc970" if ($arch eq "any");
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}
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".machine $arch";
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};
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my $asciz = sub {
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shift;
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my $line = join(",",@_);
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if ($line =~ /^"(.*)"$/)
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{ ".byte " . join(",",unpack("C*",$1),0) . "\n.align 2"; }
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else
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{ ""; }
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};
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################################################################
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# simplified mnemonics not handled by at least one assembler
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################################################################
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my $cmplw = sub {
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my $f = shift;
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my $cr = 0; $cr = shift if ($#_>1);
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# Some out-of-date 32-bit GNU assembler just can't handle cmplw...
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($flavour =~ /linux.*32/) ?
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" .long ".sprintf "0x%x",31<<26|$cr<<23|$_[0]<<16|$_[1]<<11|64 :
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" cmplw ".join(',',$cr,@_);
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};
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my $bdnz = sub {
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my $f = shift;
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my $bo = $f=~/[\+\-]/ ? 16+9 : 16; # optional "to be taken" hint
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" bc $bo,0,".shift;
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} if ($flavour!~/linux/);
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my $bltlr = sub {
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my $f = shift;
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my $bo = $f=~/\-/ ? 12+2 : 12; # optional "not to be taken" hint
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($flavour =~ /linux/) ? # GNU as doesn't allow most recent hints
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" .long ".sprintf "0x%x",19<<26|$bo<<21|16<<1 :
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" bclr $bo,0";
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};
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my $bnelr = sub {
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my $f = shift;
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my $bo = $f=~/\-/ ? 4+2 : 4; # optional "not to be taken" hint
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($flavour =~ /linux/) ? # GNU as doesn't allow most recent hints
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" .long ".sprintf "0x%x",19<<26|$bo<<21|2<<16|16<<1 :
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" bclr $bo,2";
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};
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my $beqlr = sub {
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my $f = shift;
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my $bo = $f=~/-/ ? 12+2 : 12; # optional "not to be taken" hint
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($flavour =~ /linux/) ? # GNU as doesn't allow most recent hints
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" .long ".sprintf "0x%X",19<<26|$bo<<21|2<<16|16<<1 :
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" bclr $bo,2";
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};
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# GNU assembler can't handle extrdi rA,rS,16,48, or when sum of last two
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# arguments is 64, with "operand out of range" error.
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my $extrdi = sub {
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my ($f,$ra,$rs,$n,$b) = @_;
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$b = ($b+$n)&63; $n = 64-$n;
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" rldicl $ra,$rs,$b,$n";
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};
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while($line=<>) {
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$line =~ s|[#!;].*$||; # get rid of asm-style comments...
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$line =~ s|/\*.*\*/||; # ... and C-style comments...
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$line =~ s|^\s+||; # ... and skip white spaces in beginning...
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$line =~ s|\s+$||; # ... and at the end
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{
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$line =~ s|\b\.L(\w+)|L$1|g; # common denominator for Locallabel
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$line =~ s|\bL(\w+)|\.L$1|g if ($dotinlocallabels);
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}
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{
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$line =~ s|(^[\.\w]+)\:\s*||;
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my $label = $1;
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printf "%s:",($GLOBALS{$label} or $label) if ($label);
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}
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{
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$line =~ s|^\s*(\.?)(\w+)([\.\+\-]?)\s*||;
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my $c = $1; $c = "\t" if ($c eq "");
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my $mnemonic = $2;
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my $f = $3;
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my $opcode = eval("\$$mnemonic");
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$line =~ s|\bc?[rf]([0-9]+)\b|$1|g if ($c ne "." and $flavour !~ /osx/);
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if (ref($opcode) eq 'CODE') { $line = &$opcode($f,split(',',$line)); }
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elsif ($mnemonic) { $line = $c.$mnemonic.$f."\t".$line; }
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}
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print $line if ($line);
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print "\n";
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}
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close STDOUT;
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