devel/perlasm/x86masm.pl

   1 #!/usr/bin/env perl
   2
   3 package x86masm;
   4
   5 *out=\@::out;
   6
   7 $::lbdecor="\$L";       # local label decoration
   8 $nmdecor="_";           # external name decoration
   9
  10 $initseg="";
  11 $segment="";
  12
  13 sub ::generic
  14 { my ($opcode,@arg)=@_;
  15
  16     # fix hexadecimal constants
  17     for (@arg) { s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/oi; }
  18
  19     if ($opcode !~ /movq/)
  20     {   # fix xmm references
  21         $arg[0] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[1]=~/\bxmm[0-7]\b/i);
  22         $arg[1] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[0]=~/\bxmm[0-7]\b/i);
  23     }
  24
  25     &::emit($opcode,@arg);
  26   1;
  27 }
  28 #
  29 # opcodes not covered by ::generic above, mostly inconsistent namings...
  30 #
  31 sub ::call      { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
  32 sub ::call_ptr  { &::emit("call",@_);   }
  33 sub ::jmp_ptr   { &::emit("jmp",@_);    }
  34 sub ::lock      { &::data_byte(0xf0);   }
  35
  36 sub get_mem
  37 { my($size,$addr,$reg1,$reg2,$idx)=@_;
  38   my($post,$ret);
  39
  40     $ret .= "$size PTR " if ($size ne "");
  41
  42     $addr =~ s/^\s+//;
  43     # prepend global references with optional underscore
  44     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  45     # put address arithmetic expression in parenthesis
  46     $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
  47
  48     if (($addr ne "") && ($addr ne 0))
  49     {   if ($addr !~ /^-/)      { $ret .= "$addr";  }
  50         else                    { $post=$addr;      }
  51     }
  52     $ret .= "[";
  53
  54     if ($reg2 ne "")
  55     {   $idx!=0 or $idx=1;
  56         $ret .= "$reg2*$idx";
  57         $ret .= "+$reg1" if ($reg1 ne "");
  58     }
  59     else
  60     {   $ret .= "$reg1";   }
  61
  62     $ret .= "$post]";
  63     $ret =~ s/\+\]/]/; # in case $addr was the only argument
  64     $ret =~ s/\[\s*\]//;
  65
  66   $ret;
  67 }
  68 sub ::BP        { &get_mem("BYTE",@_);  }
  69 sub ::WP        { &get_mem("WORD",@_);  }
  70 sub ::DWP       { &get_mem("DWORD",@_); }
  71 sub ::QWP       { &get_mem("QWORD",@_); }
  72 sub ::BC        { "@_";  }
  73 sub ::DWC       { "@_"; }
  74
  75 sub ::file
  76 { my $tmp=<<___;
  77 TITLE   $_[0].asm
  78 IF \@Version LT 800
  79 ECHO MASM version 8.00 or later is strongly recommended.
  80 ENDIF
  81 .486
  82 .MODEL  FLAT
  83 OPTION  DOTNAME
  84 IF \@Version LT 800
  85 .text\$ SEGMENT PAGE 'CODE'
  86 ELSE
  87 .text\$ SEGMENT ALIGN(64) 'CODE'
  88 ENDIF
  89 ___
  90     push(@out,$tmp);
  91     $segment = ".text\$";
  92 }
  93
  94 sub ::function_begin_B
  95 { my $func=shift;
  96   my $global=($func !~ /^_/);
  97   my $begin="${::lbdecor}_${func}_begin";
  98
  99     &::LABEL($func,$global?"$begin":"$nmdecor$func");
 100     $func="ALIGN\t16\n".$nmdecor.$func."\tPROC";
 101
 102     if ($global)    { $func.=" PUBLIC\n${begin}::\n"; }
 103     else            { $func.=" PRIVATE\n";            }
 104     push(@out,$func);
 105     $::stack=4;
 106 }
 107 sub ::function_end_B
 108 { my $func=shift;
 109
 110     push(@out,"$nmdecor$func ENDP\n");
 111     $::stack=0;
 112     &::wipe_labels();
 113 }
 114
 115 sub ::file_end
 116 { my $xmmheader=<<___;
 117 .686
 118 .XMM
 119 IF \@Version LT 800
 120 XMMWORD STRUCT 16
 121 DQ      2 dup (?)
 122 XMMWORD ENDS
 123 ENDIF
 124 ___
 125     if (grep {/\b[x]?mm[0-7]\b/i} @out) {
 126         grep {s/\.[3-7]86/$xmmheader/} @out;
 127     }
 128
 129     push(@out,"$segment ENDS\n");
 130
 131     if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
 132     {   my $comm=<<___;
 133 .bss    SEGMENT 'BSS'
 134 COMM    ${nmdecor}OPENSSL_ia32cap_P:QWORD
 135 .bss    ENDS
 136 ___
 137         # comment out OPENSSL_ia32cap_P declarations
 138         grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
 139         push (@out,$comm);
 140     }
 141     push (@out,$initseg) if ($initseg);
 142     push (@out,"END\n");
 143 }
 144
 145 sub ::comment {   foreach (@_) { push(@out,"\t; $_\n"); }   }
 146
 147 *::set_label_B = sub
 148 { my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); };
 149
 150 sub ::external_label
 151 {   foreach(@_)
 152     {   push(@out, "EXTERN\t".&::LABEL($_,$nmdecor.$_).":NEAR\n");   }
 153 }
 154
 155 sub ::public_label
 156 {   push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 157
 158 sub ::data_byte
 159 {   push(@out,("DB\t").join(',',@_)."\n");      }
 160
 161 sub ::data_short
 162 {   push(@out,("DW\t").join(',',@_)."\n");      }
 163
 164 sub ::data_word
 165 {   push(@out,("DD\t").join(',',@_)."\n");      }
 166
 167 sub ::align
 168 {   push(@out,"ALIGN\t$_[0]\n");        }
 169
 170 sub ::picmeup
 171 { my($dst,$sym)=@_;
 172     &::lea($dst,&::DWP($sym));
 173 }
 174
 175 sub ::initseg
 176 { my $f=$nmdecor.shift;
 177
 178     $initseg.=<<___;
 179 .CRT\$XCU       SEGMENT DWORD PUBLIC 'DATA'
 180 EXTERN  $f:NEAR
 181 DD      $f
 182 .CRT\$XCU       ENDS
 183 ___
 184 }
 185
 186 sub ::dataseg
 187 {   push(@out,"$segment\tENDS\n_DATA\tSEGMENT\n"); $segment="_DATA";   }
 188
 189 sub ::safeseh
 190 { my $nm=shift;
 191     push(@out,"IF \@Version GE 710\n");
 192     push(@out,".SAFESEH ".&::LABEL($nm,$nmdecor.$nm)."\n");
 193     push(@out,"ENDIF\n");
 194 }
 195
 196 1;