crypto/perlasm/x86gas.pl

   1 #!/usr/bin/env perl
   2
   3 package x86gas;
   4
   5 *out=\@::out;
   6
   7 $::lbdecor=$::aout?"L":".L";            # local label decoration
   8 $nmdecor=($::aout or $::coff)?"_":"";   # external name decoration
   9
  10 $initseg="";
  11
  12 $align=16;
  13 $align=log($align)/log(2) if ($::aout);
  14 $com_start="#" if ($::aout or $::coff);
  15
  16 sub opsize()
  17 { my $reg=shift;
  18     if    ($reg =~ m/^%e/o)             { "l"; }
  19     elsif ($reg =~ m/^%[a-d][hl]$/o)    { "b"; }
  20     elsif ($reg =~ m/^%[xm]/o)          { undef; }
  21     else                                { "w"; }
  22 }
  23
  24 # swap arguments;
  25 # expand opcode with size suffix;
  26 # prefix numeric constants with $;
  27 sub ::generic
  28 { my($opcode,$dst,$src)=@_;
  29   my($tmp,$suffix,@arg);
  30
  31     if (defined($src))
  32     {   $src =~ s/^(e?[a-dsixphl]{2})$/%$1/o;
  33         $src =~ s/^(x?mm[0-7])$/%$1/o;
  34         $src =~ s/^(\-?[0-9]+)$/\$$1/o;
  35         $src =~ s/^(\-?0x[0-9a-f]+)$/\$$1/o;
  36         push(@arg,$src);
  37     }
  38     if (defined($dst))
  39     {   $dst =~ s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;
  40         $dst =~ s/^(x?mm[0-7])$/%$1/o;
  41         $dst =~ s/^(\-?[0-9]+)$/\$$1/o          if(!defined($src));
  42         $dst =~ s/^(\-?0x[0-9a-f]+)$/\$$1/o     if(!defined($src));
  43         push(@arg,$dst);
  44     }
  45
  46     if    ($dst =~ m/^%/o)      { $suffix=&opsize($dst); }
  47     elsif ($src =~ m/^%/o)      { $suffix=&opsize($src); }
  48     else                        { $suffix="l";           }
  49     undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
  50
  51     if ($#_==0)                         { &::emit($opcode);             }
  52     elsif ($opcode =~ m/^j/o && $#_==1) { &::emit($opcode,@arg);        }
  53     elsif ($opcode eq "call" && $#_==1) { &::emit($opcode,@arg);        }
  54     elsif ($opcode =~ m/^set/&& $#_==1) { &::emit($opcode,@arg);        }
  55     else                                { &::emit($opcode.$suffix,@arg);}
  56
  57   1;
  58 }
  59 #
  60 # opcodes not covered by ::generic above, mostly inconsistent namings...
  61 #
  62 sub ::movzx     { &::movzb(@_);                 }
  63 sub ::pushfd    { &::pushfl;                    }
  64 sub ::popfd     { &::popfl;                     }
  65 sub ::cpuid     { &::emit(".byte\t0x0f,0xa2");  }
  66 sub ::rdtsc     { &::emit(".byte\t0x0f,0x31");  }
  67
  68 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  69 sub ::call_ptr  { &::generic("call","*$_[0]");  }
  70 sub ::jmp_ptr   { &::generic("jmp","*$_[0]");   }
  71
  72 *::bswap = sub  { &::emit("bswap","%$_[0]");    } if (!$::i386);
  73
  74 *::pshufw = sub
  75 { my($dst,$src,$magic)=@_;
  76     &::emit("pshufw","\$$magic","%$src","%$dst");
  77 };
  78 *::shld = sub
  79 { my($dst,$src,$bits)=@_;
  80     &::emit("shldl",$bit eq "cl"?"%cl":"\$$bits","%$src","%$dst");
  81 };
  82 *::shrd = sub
  83 { my($dst,$src,$bits)=@_;
  84     &::emit("shrdl",$bit eq "cl"?"%cl":"\$$bits","%$src","%$dst");
  85 };
  86
  87 sub ::DWP
  88 { my($addr,$reg1,$reg2,$idx)=@_;
  89   my $ret="";
  90
  91     $addr =~ s/^\s+//;
  92     # prepend global references with optional underscore
  93     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  94
  95     $reg1 = "%$reg1" if ($reg1);
  96     $reg2 = "%$reg2" if ($reg2);
  97
  98     $ret .= $addr if (($addr ne "") && ($addr ne 0));
  99
 100     if ($reg2)
 101     {   $idx!= 0 or $idx=1;
 102         $ret .= "($reg1,$reg2,$idx)";
 103     }
 104     elsif ($reg1)
 105     {   $ret .= "($reg1)";      }
 106
 107   $ret;
 108 }
 109 sub ::QWP       { &::DWP(@_);   }
 110 sub ::BP        { &::DWP(@_);   }
 111 sub ::BC        { @_;           }
 112 sub ::DWC       { @_;           }
 113
 114 sub ::file
 115 {   push(@out,".file\t\"$_[0].s\"\n.text\n");   }
 116
 117 sub ::function_begin_B
 118 { my $func=shift;
 119   my $global=($func !~ /^_/);
 120   my $begin="${::lbdecor}_${func}_begin";
 121
 122     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 123     $func=$nmdecor.$func;
 124
 125     push(@out,".globl\t$func\n")        if ($global);
 126     if ($::coff)
 127     {   push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
 128     elsif ($::aout and !$::pic)
 129     { }
 130     else
 131     {   push(@out,".type        $func,\@function\n"); }
 132     push(@out,".align\t$align\n");
 133     push(@out,"$func:\n");
 134     push(@out,"$begin:\n")              if ($global);
 135     $::stack=4;
 136 }
 137
 138 sub ::function_end_B
 139 { my $func=shift;
 140     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
 141     $::stack=0;
 142     &::wipe_labels();
 143 }
 144
 145 sub ::comment
 146         {
 147         if (!defined($com_start) or $::elf)
 148                 {       # Regarding $::elf above...
 149                         # GNU and SVR4 as'es use different comment delimiters,
 150                 push(@out,"\n");        # so we just skip ELF comments...
 151                 return;
 152                 }
 153         foreach (@_)
 154                 {
 155                 if (/^\s*$/)
 156                         { push(@out,"\n"); }
 157                 else
 158                         { push(@out,"\t$com_start $_ $com_end\n"); }
 159                 }
 160         }
 161
 162 sub ::external_label
 163 {   push(@out,".extern\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 164
 165 sub ::public_label
 166 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 167
 168 sub ::file_end
 169 {   if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 170         my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,4";
 171         if ($::elf)     { push (@out,"$tmp,4\n"); }
 172         else            { push (@out,"$tmp\n"); }
 173     }
 174     push(@out,$initseg) if ($initseg);
 175 }
 176
 177 sub ::data_byte {   push(@out,".byte\t".join(',',@_)."\n");   }
 178 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
 179
 180 sub ::align
 181 { my $val=$_[0],$p2,$i;
 182     if ($::aout)
 183     {   for ($p2=0;$val!=0;$val>>=1) { $p2++; }
 184         $val=$p2-1;
 185         $val.=",0x90";
 186     }
 187     push(@out,".align\t$val\n");
 188 }
 189
 190 sub ::picmeup
 191 { my($dst,$sym,$base,$reflabel)=@_;
 192
 193     if ($::pic && ($::elf || $::aout))
 194     {   if (!defined($base))
 195         {   &::call(&::label("PIC_me_up"));
 196             &::set_label("PIC_me_up");
 197             &::blindpop($dst);
 198             &::add($dst,"\$${nmdecor}_GLOBAL_OFFSET_TABLE_+[.-".
 199                             &::label("PIC_me_up") . "]");
 200         }
 201         else
 202         {   &::lea($dst,&::DWP("${nmdecor}_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 203                             $base));
 204         }
 205         &::mov($dst,&::DWP("$nmdecor$sym\@GOT",$dst));
 206     }
 207     else
 208     {   &::lea($dst,&::DWP($sym));      }
 209 }
 210
 211 sub ::initseg
 212 { my $f=$nmdecor.shift;
 213
 214     if ($::elf)
 215     {   $initseg.=<<___;
 216 .section        .init
 217         call    $f
 218         jmp     .Linitalign
 219 .align  $align
 220 .Linitalign:
 221 ___
 222     }
 223     elsif ($::coff)
 224     {   $initseg.=<<___;        # applies to both Cygwin and Mingw
 225 .section        .ctors
 226 .long   $f
 227 ___
 228     }
 229     elsif ($::aout)
 230     {   my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 231         $initseg.=".text\n";
 232         $initseg.=".type        $ctor,\@function\n" if ($::pic);
 233         $initseg.=<<___;        # OpenBSD way...
 234 .globl  $ctor
 235 .align  2
 236 $ctor:
 237         jmp     $f
 238 ___
 239     }
 240 }
 241
 242 1;