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,@arg)=@_;
  29   my($suffix,$dst,$src);
  30
  31     @arg=reverse(@arg);
  32
  33     for (@arg)
  34     {   s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;    # gp registers
  35         s/^([xy]?mm[0-7])$/%$1/o;               # xmm/mmx registers
  36         s/^(\-?[0-9]+)$/\$$1/o;                 # constants
  37         s/^(\-?0x[0-9a-f]+)$/\$$1/o;            # constants
  38     }
  39
  40     $dst = $arg[$#arg]          if ($#arg>=0);
  41     $src = $arg[$#arg-1]        if ($#arg>=1);
  42     if    ($dst =~ m/^%/o)      { $suffix=&opsize($dst); }
  43     elsif ($src =~ m/^%/o)      { $suffix=&opsize($src); }
  44     else                        { $suffix="l";           }
  45     undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
  46
  47     if ($#_==0)                         { &::emit($opcode);             }
  48     elsif ($opcode =~ m/^j/o && $#_==1) { &::emit($opcode,@arg);        }
  49     elsif ($opcode eq "call" && $#_==1) { &::emit($opcode,@arg);        }
  50     elsif ($opcode =~ m/^set/&& $#_==1) { &::emit($opcode,@arg);        }
  51     else                                { &::emit($opcode.$suffix,@arg);}
  52
  53   1;
  54 }
  55 #
  56 # opcodes not covered by ::generic above, mostly inconsistent namings...
  57 #
  58 sub ::movzx     { &::movzb(@_);                 }
  59 sub ::pushfd    { &::pushfl;                    }
  60 sub ::popfd     { &::popfl;                     }
  61 sub ::cpuid     { &::emit(".byte\t0x0f,0xa2");  }
  62 sub ::rdtsc     { &::emit(".byte\t0x0f,0x31");  }
  63
  64 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  65 sub ::call_ptr  { &::generic("call","*$_[0]");  }
  66 sub ::jmp_ptr   { &::generic("jmp","*$_[0]");   }
  67
  68 *::bswap = sub  { &::emit("bswap","%$_[0]");    } if (!$::i386);
  69
  70 sub ::DWP
  71 { my($addr,$reg1,$reg2,$idx)=@_;
  72   my $ret="";
  73
  74     $addr =~ s/^\s+//;
  75     # prepend global references with optional underscore
  76     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  77
  78     $reg1 = "%$reg1" if ($reg1);
  79     $reg2 = "%$reg2" if ($reg2);
  80
  81     $ret .= $addr if (($addr ne "") && ($addr ne 0));
  82
  83     if ($reg2)
  84     {   $idx!= 0 or $idx=1;
  85         $ret .= "($reg1,$reg2,$idx)";
  86     }
  87     elsif ($reg1)
  88     {   $ret .= "($reg1)";      }
  89
  90   $ret;
  91 }
  92 sub ::QWP       { &::DWP(@_);   }
  93 sub ::BP        { &::DWP(@_);   }
  94 sub ::BC        { @_;           }
  95 sub ::DWC       { @_;           }
  96
  97 sub ::file
  98 {   push(@out,".file\t\"$_[0].s\"\n.text\n");   }
  99
 100 sub ::function_begin_B
 101 { my $func=shift;
 102   my $global=($func !~ /^_/);
 103   my $begin="${::lbdecor}_${func}_begin";
 104
 105     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 106     $func=$nmdecor.$func;
 107
 108     push(@out,".globl\t$func\n")        if ($global);
 109     if ($::coff)
 110     {   push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
 111     elsif (($::aout and !$::pic) or $::macosx)
 112     { }
 113     else
 114     {   push(@out,".type        $func,\@function\n"); }
 115     push(@out,".align\t$align\n");
 116     push(@out,"$func:\n");
 117     push(@out,"$begin:\n")              if ($global);
 118     $::stack=4;
 119 }
 120
 121 sub ::function_end_B
 122 { my $func=shift;
 123     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
 124     $::stack=0;
 125     &::wipe_labels();
 126 }
 127
 128 sub ::comment
 129         {
 130         if (!defined($com_start) or $::elf)
 131                 {       # Regarding $::elf above...
 132                         # GNU and SVR4 as'es use different comment delimiters,
 133                 push(@out,"\n");        # so we just skip ELF comments...
 134                 return;
 135                 }
 136         foreach (@_)
 137                 {
 138                 if (/^\s*$/)
 139                         { push(@out,"\n"); }
 140                 else
 141                         { push(@out,"\t$com_start $_ $com_end\n"); }
 142                 }
 143         }
 144
 145 sub ::external_label
 146 {   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
 147
 148 sub ::public_label
 149 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 150
 151 sub ::file_end
 152 {   if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 153         my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,8";
 154         if ($::elf)     { push (@out,"$tmp,4\n"); }
 155         else            { push (@out,"$tmp\n"); }
 156     }
 157     if ($::macosx)
 158     {   if (%non_lazy_ptr)
 159         {   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
 160             foreach $i (keys %non_lazy_ptr)
 161             {   push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
 162         }
 163     }
 164     push(@out,$initseg) if ($initseg);
 165 }
 166
 167 sub ::data_byte {   push(@out,".byte\t".join(',',@_)."\n");   }
 168 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
 169
 170 sub ::align
 171 { my $val=$_[0],$p2,$i;
 172     if ($::aout)
 173     {   for ($p2=0;$val!=0;$val>>=1) { $p2++; }
 174         $val=$p2-1;
 175         $val.=",0x90";
 176     }
 177     push(@out,".align\t$val\n");
 178 }
 179
 180 sub ::picmeup
 181 { my($dst,$sym,$base,$reflabel)=@_;
 182
 183     if ($::pic && ($::elf || $::aout))
 184     {   if (!defined($base))
 185         {   &::call(&::label("PIC_me_up"));
 186             &::set_label("PIC_me_up");
 187             &::blindpop($dst);
 188             $base=$dst;
 189             $reflabel=&::label("PIC_me_up");
 190         }
 191         if ($::macosx)
 192         {   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
 193             &::mov($dst,&::DWP("$indirect-$reflabel",$base));
 194             $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
 195         }
 196         else
 197         {   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 198                             $base));
 199             &::mov($dst,&::DWP("$sym\@GOT",$dst));
 200         }
 201     }
 202     else
 203     {   &::lea($dst,&::DWP($sym));      }
 204 }
 205
 206 sub ::initseg
 207 { my $f=$nmdecor.shift;
 208
 209     if ($::elf)
 210     {   $initseg.=<<___;
 211 .section        .init
 212         call    $f
 213         jmp     .Linitalign
 214 .align  $align
 215 .Linitalign:
 216 ___
 217     }
 218     elsif ($::coff)
 219     {   $initseg.=<<___;        # applies to both Cygwin and Mingw
 220 .section        .ctors
 221 .long   $f
 222 ___
 223     }
 224     elsif ($::macosx)
 225     {   $initseg.=<<___;
 226 .mod_init_func
 227 .align 2
 228 .long   $f
 229 ___
 230     }
 231     elsif ($::aout)
 232     {   my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 233         $initseg.=".text\n";
 234         $initseg.=".type        $ctor,\@function\n" if ($::pic);
 235         $initseg.=<<___;        # OpenBSD way...
 236 .globl  $ctor
 237 .align  2
 238 $ctor:
 239         jmp     $f
 240 ___
 241     }
 242 }
 243
 244 sub ::dataseg
 245 {   push(@out,".data\n");   }
 246
 247 1;