devel/perlasm/x86nasm.pl

   1 #!/usr/bin/env perl
   2
   3 package x86nasm;
   4
   5 *out=\@::out;
   6
   7 $::lbdecor="L\$";               # local label decoration
   8 $nmdecor=$::netware?"":"_";     # external name decoration
   9 $drdecor=$::mwerks?".":"";      # directive decoration
  10
  11 $initseg="";
  12
  13 sub ::generic
  14 { my $opcode=shift;
  15   my $tmp;
  16
  17     if (!$::mwerks)
  18     {   if    ($opcode =~ m/^j/o && $#_==0) # optimize jumps
  19         {   $_[0] = "NEAR $_[0]";       }
  20         elsif ($opcode eq "lea" && $#_==1)  # wipe storage qualifier from lea
  21         {   $_[1] =~ s/^[^\[]*\[/\[/o;  }
  22         elsif ($opcode eq "clflush" && $#_==0)
  23         {   $_[0] =~ s/^[^\[]*\[/\[/o;  }
  24     }
  25     &::emit($opcode,@_);
  26   1;
  27 }
  28 #
  29 # opcodes not covered by ::generic above, mostly inconsistent namings...
  30 #
  31 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  32 sub ::call_ptr  { &::emit("call",@_);   }
  33 sub ::jmp_ptr   { &::emit("jmp",@_);    }
  34
  35 sub get_mem
  36 { my($size,$addr,$reg1,$reg2,$idx)=@_;
  37   my($post,$ret);
  38
  39     if ($size ne "")
  40     {   $ret .= "$size";
  41         $ret .= " PTR" if ($::mwerks);
  42         $ret .= " ";
  43     }
  44     $ret .= "[";
  45
  46     $addr =~ s/^\s+//;
  47     # prepend global references with optional underscore
  48     $addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige;
  49     # put address arithmetic expression in parenthesis
  50     $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
  51
  52     if (($addr ne "") && ($addr ne 0))
  53     {   if ($addr !~ /^-/)      { $ret .= "$addr+"; }
  54         else                    { $post=$addr;      }
  55     }
  56
  57     if ($reg2 ne "")
  58     {   $idx!=0 or $idx=1;
  59         $ret .= "$reg2*$idx";
  60         $ret .= "+$reg1" if ($reg1 ne "");
  61     }
  62     else
  63     {   $ret .= "$reg1";   }
  64
  65     $ret .= "$post]";
  66     $ret =~ s/\+\]/]/; # in case $addr was the only argument
  67
  68   $ret;
  69 }
  70 sub ::BP        { &get_mem("BYTE",@_);  }
  71 sub ::DWP       { &get_mem("DWORD",@_); }
  72 sub ::WP        { &get_mem("WORD",@_);  }
  73 sub ::QWP       { &get_mem("",@_);      }
  74 sub ::BC        { (($::mwerks)?"":"BYTE ")."@_";  }
  75 sub ::DWC       { (($::mwerks)?"":"DWORD ")."@_"; }
  76
  77 sub ::file
  78 {   if ($::mwerks)      { push(@out,".section\t.text,64\n"); }
  79     else
  80     { my $tmp=<<___;
  81 %ifidn __OUTPUT_FORMAT__,obj
  82 section code    use32 class=code align=64
  83 %elifidn __OUTPUT_FORMAT__,win32
  84 \$\@feat.00 equ 1
  85 section .text   code align=64
  86 %else
  87 section .text   code
  88 %endif
  89 ___
  90         push(@out,$tmp);
  91     }
  92 }
  93
  94 sub ::function_begin_B
  95 { my $func=shift;
  96   my $global=($func !~ /^_/);
  97   my $begin="${::lbdecor}_${func}_begin";
  98
  99     $begin =~ s/^\@/./ if ($::mwerks);  # the torture never stops
 100
 101     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 102     $func=$nmdecor.$func;
 103
 104     push(@out,"${drdecor}global $func\n")       if ($global);
 105     push(@out,"${drdecor}align  16\n");
 106     push(@out,"$func:\n");
 107     push(@out,"$begin:\n")                      if ($global);
 108     $::stack=4;
 109 }
 110
 111 sub ::function_end_B
 112 {   $::stack=0;
 113     &::wipe_labels();
 114 }
 115
 116 sub ::file_end
 117 {   if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
 118     {   my $comm=<<___;
 119 ${drdecor}segment       .bss
 120 ${drdecor}common        ${nmdecor}OPENSSL_ia32cap_P 8
 121 ___
 122         # comment out OPENSSL_ia32cap_P declarations
 123         grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
 124         push (@out,$comm)
 125     }
 126     push (@out,$initseg) if ($initseg);
 127 }
 128
 129 sub ::comment {   foreach (@_) { push(@out,"\t; $_\n"); }   }
 130
 131 sub ::external_label
 132 {   foreach(@_)
 133     {   push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n");   }
 134 }
 135
 136 sub ::public_label
 137 {   push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");  }
 138
 139 sub ::data_byte
 140 {   push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n");        }
 141 sub ::data_short
 142 {   push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n");        }
 143 sub ::data_word
 144 {   push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n");        }
 145
 146 sub ::align
 147 {   push(@out,"${drdecor}align\t$_[0]\n");      }
 148
 149 sub ::picmeup
 150 { my($dst,$sym)=@_;
 151     &::lea($dst,&::DWP($sym));
 152 }
 153
 154 sub ::initseg
 155 { my $f=$nmdecor.shift;
 156     if ($::win32)
 157     {   $initseg=<<___;
 158 segment .CRT\$XCU data align=4
 159 extern  $f
 160 dd      $f
 161 ___
 162     }
 163 }
 164
 165 sub ::dataseg
 166 {   if ($mwerks)        { push(@out,".section\t.data,4\n");   }
 167     else                { push(@out,"section\t.data align=4\n"); }
 168 }
 169
 170 sub ::safeseh
 171 { my $nm=shift;
 172     push(@out,"%if      __NASM_VERSION_ID__ >= 0x02030000\n");
 173     push(@out,"safeseh  ".&::LABEL($nm,$nmdecor.$nm)."\n");
 174     push(@out,"%endif\n");
 175 }
 176
 177 1;