devel/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 eq "clflush" && $#_==1){ &::emit($opcode,@arg);      }
  51     elsif ($opcode =~ m/^set/&& $#_==1) { &::emit($opcode,@arg);        }
  52     else                                { &::emit($opcode.$suffix,@arg);}
  53
  54   1;
  55 }
  56 #
  57 # opcodes not covered by ::generic above, mostly inconsistent namings...
  58 #
  59 sub ::movzx     { &::movzb(@_);                 }
  60 sub ::pushfd    { &::pushfl;                    }
  61 sub ::popfd     { &::popfl;                     }
  62 sub ::cpuid     { &::emit(".byte\t0x0f,0xa2");  }
  63 sub ::rdtsc     { &::emit(".byte\t0x0f,0x31");  }
  64
  65 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  66 sub ::call_ptr  { &::generic("call","*$_[0]");  }
  67 sub ::jmp_ptr   { &::generic("jmp","*$_[0]");   }
  68
  69 *::bswap = sub  { &::emit("bswap","%$_[0]");    } if (!$::i386);
  70
  71 sub ::DWP
  72 { my($addr,$reg1,$reg2,$idx)=@_;
  73   my $ret="";
  74
  75     $addr =~ s/^\s+//;
  76     # prepend global references with optional underscore
  77     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  78
  79     $reg1 = "%$reg1" if ($reg1);
  80     $reg2 = "%$reg2" if ($reg2);
  81
  82     $ret .= $addr if (($addr ne "") && ($addr ne 0));
  83
  84     if ($reg2)
  85     {   $idx!= 0 or $idx=1;
  86         $ret .= "($reg1,$reg2,$idx)";
  87     }
  88     elsif ($reg1)
  89     {   $ret .= "($reg1)";      }
  90
  91   $ret;
  92 }
  93 sub ::QWP       { &::DWP(@_);   }
  94 sub ::BP        { &::DWP(@_);   }
  95 sub ::WP        { &::DWP(@_);   }
  96 sub ::BC        { @_;           }
  97 sub ::DWC       { @_;           }
  98
  99 sub ::file
 100 {   push(@out,".file\t\"$_[0].s\"\n.text\n");   }
 101
 102 sub ::function_begin_B
 103 { my $func=shift;
 104   my $global=($func !~ /^_/);
 105   my $begin="${::lbdecor}_${func}_begin";
 106
 107     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 108     $func=$nmdecor.$func;
 109
 110     push(@out,".globl\t$func\n")        if ($global);
 111     if ($::coff)
 112     {   push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
 113     elsif (($::aout and !$::pic) or $::macosx)
 114     { }
 115     else
 116     {   push(@out,".type        $func,\@function\n"); }
 117     push(@out,".align\t$align\n");
 118     push(@out,"$func:\n");
 119     push(@out,"$begin:\n")              if ($global);
 120     $::stack=4;
 121 }
 122
 123 sub ::function_end_B
 124 { my $func=shift;
 125     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
 126     $::stack=0;
 127     &::wipe_labels();
 128 }
 129
 130 sub ::comment
 131         {
 132         if (!defined($com_start) or $::elf)
 133                 {       # Regarding $::elf above...
 134                         # GNU and SVR4 as'es use different comment delimiters,
 135                 push(@out,"\n");        # so we just skip ELF comments...
 136                 return;
 137                 }
 138         foreach (@_)
 139                 {
 140                 if (/^\s*$/)
 141                         { push(@out,"\n"); }
 142                 else
 143                         { push(@out,"\t$com_start $_ $com_end\n"); }
 144                 }
 145         }
 146
 147 sub ::external_label
 148 {   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
 149
 150 sub ::public_label
 151 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 152
 153 sub ::file_end
 154 {   if ($::macosx)
 155     {   if (%non_lazy_ptr)
 156         {   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
 157             foreach $i (keys %non_lazy_ptr)
 158             {   push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
 159         }
 160     }
 161     if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 162         my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,8";
 163         if ($::macosx)  { push (@out,"$tmp,2\n"); }
 164         elsif ($::elf)  { push (@out,"$tmp,4\n"); }
 165         else            { push (@out,"$tmp\n"); }
 166     }
 167     push(@out,$initseg) if ($initseg);
 168 }
 169
 170 sub ::data_byte {   push(@out,".byte\t".join(',',@_)."\n");   }
 171 sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
 172 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
 173
 174 sub ::align
 175 { my $val=$_[0],$p2,$i;
 176     if ($::aout)
 177     {   for ($p2=0;$val!=0;$val>>=1) { $p2++; }
 178         $val=$p2-1;
 179         $val.=",0x90";
 180     }
 181     push(@out,".align\t$val\n");
 182 }
 183
 184 sub ::picmeup
 185 { my($dst,$sym,$base,$reflabel)=@_;
 186
 187     if (($::pic && ($::elf || $::aout)) || $::macosx)
 188     {   if (!defined($base))
 189         {   &::call(&::label("PIC_me_up"));
 190             &::set_label("PIC_me_up");
 191             &::blindpop($dst);
 192             $base=$dst;
 193             $reflabel=&::label("PIC_me_up");
 194         }
 195         if ($::macosx)
 196         {   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
 197             &::mov($dst,&::DWP("$indirect-$reflabel",$base));
 198             $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
 199         }
 200         else
 201         {   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 202                             $base));
 203             &::mov($dst,&::DWP("$sym\@GOT",$dst));
 204         }
 205     }
 206     else
 207     {   &::lea($dst,&::DWP($sym));      }
 208 }
 209
 210 sub ::initseg
 211 { my $f=$nmdecor.shift;
 212
 213     if ($::android)
 214     {   $initseg.=<<___;
 215 .section        .init_array
 216 .align  4
 217 .long   $f
 218 ___
 219     }
 220     elsif ($::elf)
 221     {   $initseg.=<<___;
 222 .section        .init
 223         call    $f
 224 ___
 225     }
 226     elsif ($::coff)
 227     {   $initseg.=<<___;        # applies to both Cygwin and Mingw
 228 .section        .ctors
 229 .long   $f
 230 ___
 231     }
 232     elsif ($::macosx)
 233     {   $initseg.=<<___;
 234 .mod_init_func
 235 .align 2
 236 .long   $f
 237 ___
 238     }
 239     elsif ($::aout)
 240     {   my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 241         $initseg.=".text\n";
 242         $initseg.=".type        $ctor,\@function\n" if ($::pic);
 243         $initseg.=<<___;        # OpenBSD way...
 244 .globl  $ctor
 245 .align  2
 246 $ctor:
 247         jmp     $f
 248 ___
 249     }
 250 }
 251
 252 sub ::dataseg
 253 {   push(@out,".data\n");   }
 254
 255 1;