lib/libcrypto/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($opcode);             }
  48     elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
  49                                         { &::emit($opcode,@arg);        }
  50     else                                { &::emit($opcode.$suffix,@arg);}
  51
  52   1;
  53 }
  54 #
  55 # opcodes not covered by ::generic above, mostly inconsistent namings...
  56 #
  57 sub ::movzx     { &::movzb(@_);                 }
  58 sub ::pushfd    { &::pushfl;                    }
  59 sub ::popfd     { &::popfl;                     }
  60 sub ::cpuid     { &::emit(".byte\t0x0f,0xa2");  }
  61 sub ::rdtsc     { &::emit(".byte\t0x0f,0x31");  }
  62
  63 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  64 sub ::call_ptr  { &::generic("call","*$_[0]");  }
  65 sub ::jmp_ptr   { &::generic("jmp","*$_[0]");   }
  66
  67 *::bswap = sub  { &::emit("bswap","%$_[0]");    } if (!$::i386);
  68
  69 sub ::DWP
  70 { my($addr,$reg1,$reg2,$idx)=@_;
  71   my $ret="";
  72
  73     $addr =~ s/^\s+//;
  74     # prepend global references with optional underscore
  75     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  76
  77     $reg1 = "%$reg1" if ($reg1);
  78     $reg2 = "%$reg2" if ($reg2);
  79
  80     $ret .= $addr if (($addr ne "") && ($addr ne 0));
  81
  82     if ($reg2)
  83     {   $idx!= 0 or $idx=1;
  84         $ret .= "($reg1,$reg2,$idx)";
  85     }
  86     elsif ($reg1)
  87     {   $ret .= "($reg1)";      }
  88
  89   $ret;
  90 }
  91 sub ::QWP       { &::DWP(@_);   }
  92 sub ::BP        { &::DWP(@_);   }
  93 sub ::WP        { &::DWP(@_);   }
  94 sub ::BC        { @_;           }
  95 sub ::DWC       { @_;           }
  96
  97 sub ::file
  98 {   push(@out,".file\t\"$_[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.$_[0])."\n");   }
 150
 151 sub ::file_end
 152 {   if ($::macosx)
 153     {   if (%non_lazy_ptr)
 154         {   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
 155             foreach $i (keys %non_lazy_ptr)
 156             {   push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
 157         }
 158     }
 159     if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 160         push (@out, ".extern\t${nmdecor}OPENSSL_ia32cap_P\n");
 161         push (@out, ".hidden\t${nmdecor}OPENSSL_ia32cap_P\n");
 162     }
 163     push(@out,$initseg) if ($initseg);
 164 }
 165
 166 sub ::data_byte {   push(@out,".byte\t".join(',',@_)."\n");   }
 167 sub ::data_short{   push(@out,".value\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 ($::openbsd)
 184     {  &::emitraw("#if defined(PIC) || defined(__PIC__)");
 185        &::emitraw("PIC_PROLOGUE");
 186        &::mov($dst, &::DWP("PIC_GOT($sym)"));
 187        &::emitraw("PIC_EPILOGUE");
 188        &::emitraw("#else /* PIC */");
 189        &::lea($dst,&::DWP($sym));
 190        &::emitraw("#endif /* PIC */");
 191     }
 192     if (($::pic && ($::elf || $::aout)) || $::macosx)
 193     {   if (!defined($base))
 194         {   &::call(&::label("PIC_me_up"));
 195             &::set_label("PIC_me_up");
 196             &::blindpop($dst);
 197             $base=$dst;
 198             $reflabel=&::label("PIC_me_up");
 199         }
 200         if ($::macosx)
 201         {   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
 202             &::mov($dst,&::DWP("$indirect-$reflabel",$base));
 203             $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
 204         }
 205         else
 206         {   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 207                             $base));
 208             &::mov($dst,&::DWP("$sym\@GOT",$dst));
 209         }
 210     }
 211     else
 212     {   &::lea($dst,&::DWP($sym));      }
 213 }
 214
 215 sub ::initseg
 216 { my $f=$nmdecor.shift;
 217
 218     if ($::openbsd)
 219     {   $initseg.=<<___;
 220 .section        .init
 221 PIC_PROLOGUE
 222         call    PIC_PLT($f)
 223 PIC_EPILOGUE
 224 ___
 225     } elsif ($::android)
 226     {   $initseg.=<<___;
 227 .section        .init_array
 228 .align  4
 229 .long   $f
 230 ___
 231     }
 232     elsif ($::elf)
 233     {   $initseg.=<<___;
 234 .section        .init
 235         call    $f
 236 ___
 237     }
 238     elsif ($::coff)
 239     {   $initseg.=<<___;        # applies to both Cygwin and Mingw
 240 .section        .ctors
 241 .long   $f
 242 ___
 243     }
 244     elsif ($::macosx)
 245     {   $initseg.=<<___;
 246 .mod_init_func
 247 .align 2
 248 .long   $f
 249 ___
 250     }
 251     elsif ($::aout)
 252     {   my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 253         $initseg.=".text\n";
 254         $initseg.=".type        $ctor,\@function\n" if ($::pic);
 255         $initseg.=<<___;        # OpenBSD way...
 256 .globl  $ctor
 257 .align  2
 258 $ctor:
 259         jmp     $f
 260 ___
 261     }
 262 }
 263
 264 sub ::dataseg
 265 {   push(@out,".data\n");   }
 266
 267 1;