devel/perlasm/ppc-xlate.pl

   1 #!/usr/bin/env perl
   2
   3 # PowerPC assembler distiller by <appro>.
   4
   5 my $flavour = shift;
   6 my $output = shift;
   7 open STDOUT,">$output" || die "can't open $output: $!";
   8
   9 my %GLOBALS;
  10 my $dotinlocallabels=($flavour=~/linux/)?1:0;
  11
  12 ################################################################
  13 # directives which need special treatment on different platforms
  14 ################################################################
  15 my $globl = sub {
  16     my $junk = shift;
  17     my $name = shift;
  18     my $global = \$GLOBALS{$name};
  19     my $ret;
  20
  21     $name =~ s|^[\.\_]||;
  22
  23     SWITCH: for ($flavour) {
  24         /aix/           && do { $name = ".$name";
  25                                 last;
  26                               };
  27         /osx/           && do { $name = "_$name";
  28                                 last;
  29                               };
  30         /linux.*32/     && do { $ret .= ".globl $name\n";
  31                                 $ret .= ".type  $name,\@function";
  32                                 last;
  33                               };
  34         /linux.*64/     && do { $ret .= ".globl $name\n";
  35                                 $ret .= ".type  $name,\@function\n";
  36                                 $ret .= ".section       \".opd\",\"aw\"\n";
  37                                 $ret .= ".align 3\n";
  38                                 $ret .= "$name:\n";
  39                                 $ret .= ".quad  .$name,.TOC.\@tocbase,0\n";
  40                                 $ret .= ".size  $name,24\n";
  41                                 $ret .= ".previous\n";
  42
  43                                 $name = ".$name";
  44                                 last;
  45                               };
  46     }
  47
  48     $ret = ".globl      $name" if (!$ret);
  49     $$global = $name;
  50     $ret;
  51 };
  52 my $text = sub {
  53     ($flavour =~ /aix/) ? ".csect" : ".text";
  54 };
  55 my $machine = sub {
  56     my $junk = shift;
  57     my $arch = shift;
  58     if ($flavour =~ /osx/)
  59     {   $arch =~ s/\"//g;
  60         $arch = ($flavour=~/64/) ? "ppc970-64" : "ppc970" if ($arch eq "any");
  61     }
  62     ".machine   $arch";
  63 };
  64 my $size = sub {
  65     if ($flavour =~ /linux.*32/)
  66     {   shift;
  67         ".size  " . join(",",@_);
  68     }
  69     else
  70     {   "";     }
  71 };
  72 my $asciz = sub {
  73     shift;
  74     my $line = join(",",@_);
  75     if ($line =~ /^"(.*)"$/)
  76     {   ".byte  " . join(",",unpack("C*",$1),0) . "\n.align     2";     }
  77     else
  78     {   "";     }
  79 };
  80
  81 ################################################################
  82 # simplified mnemonics not handled by at least one assembler
  83 ################################################################
  84 my $cmplw = sub {
  85     my $f = shift;
  86     my $cr = 0; $cr = shift if ($#_>1);
  87     # Some out-of-date 32-bit GNU assembler just can't handle cmplw...
  88     ($flavour =~ /linux.*32/) ?
  89         "       .long   ".sprintf "0x%x",31<<26|$cr<<23|$_[0]<<16|$_[1]<<11|64 :
  90         "       cmplw   ".join(',',$cr,@_);
  91 };
  92 my $bdnz = sub {
  93     my $f = shift;
  94     my $bo = $f=~/[\+\-]/ ? 16+9 : 16;  # optional "to be taken" hint
  95     "   bc      $bo,0,".shift;
  96 } if ($flavour!~/linux/);
  97 my $bltlr = sub {
  98     my $f = shift;
  99     my $bo = $f=~/\-/ ? 12+2 : 12;      # optional "not to be taken" hint
 100     ($flavour =~ /linux/) ?             # GNU as doesn't allow most recent hints
 101         "       .long   ".sprintf "0x%x",19<<26|$bo<<21|16<<1 :
 102         "       bclr    $bo,0";
 103 };
 104 my $bnelr = sub {
 105     my $f = shift;
 106     my $bo = $f=~/\-/ ? 4+2 : 4;        # optional "not to be taken" hint
 107     ($flavour =~ /linux/) ?             # GNU as doesn't allow most recent hints
 108         "       .long   ".sprintf "0x%x",19<<26|$bo<<21|2<<16|16<<1 :
 109         "       bclr    $bo,2";
 110 };
 111 my $beqlr = sub {
 112     my $f = shift;
 113     my $bo = $f=~/-/ ? 12+2 : 12;       # optional "not to be taken" hint
 114     ($flavour =~ /linux/) ?             # GNU as doesn't allow most recent hints
 115         "       .long   ".sprintf "0x%X",19<<26|$bo<<21|2<<16|16<<1 :
 116         "       bclr    $bo,2";
 117 };
 118 # GNU assembler can't handle extrdi rA,rS,16,48, or when sum of last two
 119 # arguments is 64, with "operand out of range" error.
 120 my $extrdi = sub {
 121     my ($f,$ra,$rs,$n,$b) = @_;
 122     $b = ($b+$n)&63; $n = 64-$n;
 123     "   rldicl  $ra,$rs,$b,$n";
 124 };
 125
 126 while($line=<>) {
 127
 128     $line =~ s|[#!;].*$||;      # get rid of asm-style comments...
 129     $line =~ s|/\*.*\*/||;      # ... and C-style comments...
 130     $line =~ s|^\s+||;          # ... and skip white spaces in beginning...
 131     $line =~ s|\s+$||;          # ... and at the end
 132
 133     {
 134         $line =~ s|\b\.L(\w+)|L$1|g;    # common denominator for Locallabel
 135         $line =~ s|\bL(\w+)|\.L$1|g     if ($dotinlocallabels);
 136     }
 137
 138     {
 139         $line =~ s|(^[\.\w]+)\:\s*||;
 140         my $label = $1;
 141         printf "%s:",($GLOBALS{$label} or $label) if ($label);
 142     }
 143
 144     {
 145         $line =~ s|^\s*(\.?)(\w+)([\.\+\-]?)\s*||;
 146         my $c = $1; $c = "\t" if ($c eq "");
 147         my $mnemonic = $2;
 148         my $f = $3;
 149         my $opcode = eval("\$$mnemonic");
 150         $line =~ s|\bc?[rf]([0-9]+)\b|$1|g if ($c ne "." and $flavour !~ /osx/);
 151         if (ref($opcode) eq 'CODE') { $line = &$opcode($f,split(',',$line)); }
 152         elsif ($mnemonic)           { $line = $c.$mnemonic.$f."\t".$line; }
 153     }
 154
 155     print $line if ($line);
 156     print "\n";
 157 }
 158
 159 close STDOUT;