crypto/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/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
  35 sub get_mem
  36 { my($size,$addr,$reg1,$reg2,$idx)=@_;
  37   my($post,$ret);
  38
  39     $ret .= "$size PTR " if ($size ne "");
  40
  41     $addr =~ s/^\s+//;
  42     # prepend global references with optional underscore
  43     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
  44     # put address arithmetic expression in parenthesis
  45     $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
  46
  47     if (($addr ne "") && ($addr ne 0))
  48     {   if ($addr !~ /^-/)      { $ret .= "$addr";  }
  49         else                    { $post=$addr;      }
  50     }
  51     $ret .= "[";
  52
  53     if ($reg2 ne "")
  54     {   $idx!=0 or $idx=1;
  55         $ret .= "$reg2*$idx";
  56         $ret .= "+$reg1" if ($reg1 ne "");
  57     }
  58     else
  59     {   $ret .= "$reg1";   }
  60
  61     $ret .= "$post]";
  62     $ret =~ s/\+\]/]/; # in case $addr was the only argument
  63     $ret =~ s/\[\s*\]//;
  64
  65   $ret;
  66 }
  67 sub ::BP        { &get_mem("BYTE",@_);  }
  68 sub ::DWP       { &get_mem("DWORD",@_); }
  69 sub ::QWP       { &get_mem("QWORD",@_); }
  70 sub ::BC        { "@_";  }
  71 sub ::DWC       { "@_"; }
  72
  73 sub ::file
  74 { my $tmp=<<___;
  75 TITLE   $_[0].asm
  76 IF \@Version LT 800
  77 ECHO MASM version 8.00 or later is strongly recommended.
  78 ENDIF
  79 .486
  80 .MODEL  FLAT
  81 OPTION  DOTNAME
  82 IF \@Version LT 800
  83 .text\$ SEGMENT PAGE 'CODE'
  84 ELSE
  85 .text\$ SEGMENT ALIGN(64) 'CODE'
  86 ENDIF
  87 ___
  88     push(@out,$tmp);
  89     $segment = ".text\$";
  90 }
  91
  92 sub ::function_begin_B
  93 { my $func=shift;
  94   my $global=($func !~ /^_/);
  95   my $begin="${::lbdecor}_${func}_begin";
  96
  97     &::LABEL($func,$global?"$begin":"$nmdecor$func");
  98     $func="ALIGN\t16\n".$nmdecor.$func."\tPROC";
  99
 100     if ($global)    { $func.=" PUBLIC\n${begin}::\n"; }
 101     else            { $func.=" PRIVATE\n";            }
 102     push(@out,$func);
 103     $::stack=4;
 104 }
 105 sub ::function_end_B
 106 { my $func=shift;
 107
 108     push(@out,"$nmdecor$func ENDP\n");
 109     $::stack=0;
 110     &::wipe_labels();
 111 }
 112
 113 sub ::file_end
 114 { my $xmmheader=<<___;
 115 .686
 116 .XMM
 117 IF \@Version LT 800
 118 XMMWORD STRUCT 16
 119 DQ      2 dup (?)
 120 XMMWORD ENDS
 121 ENDIF
 122 ___
 123     if (grep {/\b[x]?mm[0-7]\b/i} @out) {
 124         grep {s/\.[3-7]86/$xmmheader/} @out;
 125     }
 126
 127     push(@out,"$segment ENDS\n");
 128
 129     if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
 130     {   my $comm=<<___;
 131 .bss    SEGMENT 'BSS'
 132 COMM    ${nmdecor}OPENSSL_ia32cap_P:QWORD
 133 .bss    ENDS
 134 ___
 135         # comment out OPENSSL_ia32cap_P declarations
 136         grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
 137         push (@out,$comm);
 138     }
 139     push (@out,$initseg) if ($initseg);
 140     push (@out,"END\n");
 141 }
 142
 143 sub ::comment {   foreach (@_) { push(@out,"\t; $_\n"); }   }
 144
 145 *::set_label_B = sub
 146 { my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); };
 147
 148 sub ::external_label
 149 {   foreach(@_)
 150     {   push(@out, "EXTERN\t".&::LABEL($_,$nmdecor.$_).":NEAR\n");   }
 151 }
 152
 153 sub ::public_label
 154 {   push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
 155
 156 sub ::data_byte
 157 {   push(@out,("DB\t").join(',',@_)."\n");      }
 158
 159 sub ::data_word
 160 {   push(@out,("DD\t").join(',',@_)."\n");      }
 161
 162 sub ::align
 163 {   push(@out,"ALIGN\t$_[0]\n");        }
 164
 165 sub ::picmeup
 166 { my($dst,$sym)=@_;
 167     &::lea($dst,&::DWP($sym));
 168 }
 169
 170 sub ::initseg
 171 { my $f=$nmdecor.shift;
 172
 173     $initseg.=<<___;
 174 .CRT\$XCU       SEGMENT DWORD PUBLIC 'DATA'
 175 EXTERN  $f:NEAR
 176 DD      $f
 177 .CRT\$XCU       ENDS
 178 ___
 179 }
 180
 181 sub ::dataseg
 182 {   push(@out,"$segment\tENDS\n_DATA\tSEGMENT\n"); $segment="_DATA";   }
 183
 184 1;