crypto/perlasm/x86gas.pl

   1 #! /usr/bin/env perl
   2 # Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the Apache License 2.0 (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 package x86gas;
  11
  12 *out=\@::out;
  13
  14 $::lbdecor=$::aout?"L":".L";            # local label decoration
  15 $nmdecor=($::aout or $::coff)?"_":"";   # external name decoration
  16
  17 $initseg="";
  18
  19 $align=16;
  20 $align=log($align)/log(2) if ($::aout);
  21 $com_start="#" if ($::aout or $::coff);
  22
  23 sub opsize()
  24 { my $reg=shift;
  25     if    ($reg =~ m/^%e/o)             { "l"; }
  26     elsif ($reg =~ m/^%[a-d][hl]$/o)    { "b"; }
  27     elsif ($reg =~ m/^%[yxm]/o)         { undef; }
  28     else                                { "w"; }
  29 }
  30
  31 # swap arguments;
  32 # expand opcode with size suffix;
  33 # prefix numeric constants with $;
  34 sub ::generic
  35 { my($opcode,@arg)=@_;
  36   my($suffix,$dst,$src);
  37
  38     @arg=reverse(@arg);
  39
  40     for (@arg)
  41     {   s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;    # gp registers
  42         s/^([xy]?mm[0-7])$/%$1/o;               # xmm/mmx registers
  43         s/^(\-?[0-9]+)$/\$$1/o;                 # constants
  44         s/^(\-?0x[0-9a-f]+)$/\$$1/o;            # constants
  45     }
  46
  47     $dst = $arg[$#arg]          if ($#arg>=0);
  48     $src = $arg[$#arg-1]        if ($#arg>=1);
  49     if    ($dst =~ m/^%/o)      { $suffix=&opsize($dst); }
  50     elsif ($src =~ m/^%/o)      { $suffix=&opsize($src); }
  51     else                        { $suffix="l";           }
  52     undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
  53
  54     if ($#_==0)                         { &::emit($opcode);             }
  55     elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
  56                                         { &::emit($opcode,@arg);        }
  57     else                                { &::emit($opcode.$suffix,@arg);}
  58
  59   1;
  60 }
  61 #
  62 # opcodes not covered by ::generic above, mostly inconsistent namings...
  63 #
  64 sub ::movzx     { &::movzb(@_);                 }
  65 sub ::pushfd    { &::pushfl;                    }
  66 sub ::popfd     { &::popfl;                     }
  67 sub ::cpuid     { &::emit(".byte\t0x0f,0xa2");  }
  68 sub ::rdtsc     { &::emit(".byte\t0x0f,0x31");  }
  69
  70 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  71 sub ::call_ptr  { &::generic("call","*$_[0]");  }
  72 sub ::jmp_ptr   { &::generic("jmp","*$_[0]");   }
  73
  74 *::bswap = sub  { &::emit("bswap","%$_[0]");    } if (!$::i386);
  75
  76 sub ::DWP
  77 { my($addr,$reg1,$reg2,$idx)=@_;
  78   my $ret="";
  79
  80     if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
  81
  82     $addr =~ s/^\s+//;
  83     # prepend global references with optional underscore
  84     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  85
  86     $reg1 = "%$reg1" if ($reg1);
  87     $reg2 = "%$reg2" if ($reg2);
  88
  89     $ret .= $addr if (($addr ne "") && ($addr ne 0));
  90
  91     if ($reg2)
  92     {   $idx!= 0 or $idx=1;
  93         $ret .= "($reg1,$reg2,$idx)";
  94     }
  95     elsif ($reg1)
  96     {   $ret .= "($reg1)";      }
  97
  98   $ret;
  99 }
 100 sub ::QWP       { &::DWP(@_);   }
 101 sub ::BP        { &::DWP(@_);   }
 102 sub ::WP        { &::DWP(@_);   }
 103 sub ::BC        { @_;           }
 104 sub ::DWC       { @_;           }
 105
 106 sub ::file
 107 {   push(@out,".text\n");       }
 108
 109 sub ::function_begin_B
 110 { my $func=shift;
 111   my $global=($func !~ /^_/);
 112   my $begin="${::lbdecor}_${func}_begin";
 113
 114     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 115     $func=$nmdecor.$func;
 116
 117     push(@out,".globl\t$func\n")        if ($global);
 118     if ($::coff)
 119     {   push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
 120     elsif (($::aout and !$::pic) or $::macosx)
 121     { }
 122     else
 123     {   push(@out,".type        $func,\@function\n"); }
 124     push(@out,".align\t$align\n");
 125     push(@out,"$func:\n");
 126     push(@out,"$begin:\n")              if ($global);
 127     &::endbranch();
 128     $::stack=4;
 129 }
 130
 131 sub ::function_end_B
 132 { my $func=shift;
 133     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
 134     $::stack=0;
 135     &::wipe_labels();
 136 }
 137
 138 sub ::comment
 139         {
 140         if (!defined($com_start) or $::elf)
 141                 {       # Regarding $::elf above...
 142                         # GNU and SVR4 as'es use different comment delimiters,
 143                 push(@out,"\n");        # so we just skip ELF comments...
 144                 return;
 145                 }
 146         foreach (@_)
 147                 {
 148                 if (/^\s*$/)
 149                         { push(@out,"\n"); }
 150                 else
 151                         { push(@out,"\t$com_start $_ $com_end\n"); }
 152                 }
 153         }
 154
 155 sub ::external_label
 156 {   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
 157
 158 sub ::public_label
 159 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 160
 161 sub ::file_end
 162 {   if ($::macosx)
 163     {   if (%non_lazy_ptr)
 164         {   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
 165             foreach $i (keys %non_lazy_ptr)
 166             {   push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
 167         }
 168     }
 169     if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 170         my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
 171         if ($::macosx)  { push (@out,"$tmp,2\n"); }
 172         elsif ($::elf)  { push (@out,"$tmp,4\n"); }
 173         else            { push (@out,"$tmp\n"); }
 174     }
 175     push(@out,$initseg) if ($initseg);
 176     if ($::elf) {
 177         push(@out,"
 178         .section \".note.gnu.property\", \"a\"
 179         .p2align 2
 180         .long 1f - 0f
 181         .long 4f - 1f
 182         .long 5
 183 0:
 184         .asciz \"GNU\"
 185 1:
 186         .p2align 2
 187         .long 0xc0000002
 188         .long 3f - 2f
 189 2:
 190         .long 3
 191 3:
 192         .p2align 2
 193 4:
 194 ");
 195     }
 196 }
 197
 198 sub ::data_byte {   push(@out,".byte\t".join(',',@_)."\n");   }
 199 sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
 200 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
 201
 202 sub ::align
 203 { my $val=$_[0];
 204     if ($::aout)
 205     {   $val=int(log($val)/log(2));
 206         $val.=",0x90";
 207     }
 208     push(@out,".align\t$val\n");
 209 }
 210
 211 sub ::picmeup
 212 { my($dst,$sym,$base,$reflabel)=@_;
 213
 214     if (($::pic && ($::elf || $::aout)) || $::macosx)
 215     {   if (!defined($base))
 216         {   &::call(&::label("PIC_me_up"));
 217             &::set_label("PIC_me_up");
 218             &::blindpop($dst);
 219             $base=$dst;
 220             $reflabel=&::label("PIC_me_up");
 221         }
 222         if ($::macosx)
 223         {   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
 224             &::mov($dst,&::DWP("$indirect-$reflabel",$base));
 225             $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
 226         }
 227         elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
 228         {   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
 229         else
 230         {   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 231                             $base));
 232             &::mov($dst,&::DWP("$sym\@GOT",$dst));
 233         }
 234     }
 235     else
 236     {   &::lea($dst,&::DWP($sym));      }
 237 }
 238
 239 sub ::initseg
 240 { my $f=$nmdecor.shift;
 241
 242     if ($::android)
 243     {   $initseg.=<<___;
 244 .section        .init_array
 245 .align  4
 246 .long   $f
 247 ___
 248     }
 249     elsif ($::elf)
 250     {   $initseg.=<<___;
 251 .section        .init
 252         call    $f
 253 ___
 254     }
 255     elsif ($::coff)
 256     {   $initseg.=<<___;        # applies to both Cygwin and Mingw
 257 .section        .ctors
 258 .long   $f
 259 ___
 260     }
 261     elsif ($::macosx)
 262     {   $initseg.=<<___;
 263 .mod_init_func
 264 .align 2
 265 .long   $f
 266 ___
 267     }
 268     elsif ($::aout)
 269     {   my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 270         $initseg.=".text\n";
 271         $initseg.=".type        $ctor,\@function\n" if ($::pic);
 272         $initseg.=<<___;        # OpenBSD way...
 273 .globl  $ctor
 274 .align  2
 275 $ctor:
 276         jmp     $f
 277 ___
 278     }
 279 }
 280
 281 sub ::dataseg
 282 {   push(@out,".data\n");   }
 283
 284 *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
 285
 286 1;