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1); 87 # Some out-of-date 32-bit GNU assembler just can't handle cmplw... 88 ($flavour =~ /linux.*32/) ? 89 " .long ".sprintf "0x%x",31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; 160
