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1); 80 # Some out-of-date 32-bit GNU assembler just can't handle cmplw... 81 ($flavour =~ /linux.*32/) ? 82 " .long ".sprintf "0x%x",31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