1 #!/usr/bin/env perl
   2 
   3 # require 'x86asm.pl';
   4 # &asm_init(<flavor>,"des-586.pl"[,$i386only]);
   5 # &function_begin("foo");
   6 # ...
   7 # &function_end("foo");
   8 # &asm_finish
   9 
  10 $out=();
  11 $i386=0;
  12 
  13 # AUTOLOAD is this context has quite unpleasant side effect, namely
  14 # that typos in function calls effectively go to assembler output,
  15 # but on the pros side we don't have to implement one subroutine per
  16 # each opcode...
  17 sub ::AUTOLOAD
  18 { my $opcode = $AUTOLOAD;
  19 
  20     die "more than 4 arguments passed to $opcode" if ($#_>3);
  21 
  22     $opcode =~ s/.*:://;
  23     if    ($opcode =~ /^push/) { $stack+=4; }
  24     elsif ($opcode =~ /^pop/)  { $stack-=4; }
  25 
  26     &generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
  27 }
  28 
  29 sub ::emit
  30 { my $opcode=shift;
  31 
  32     if ($#_==-1)    { push(@out,"\t$opcode\n");                         }
  33     else            { push(@out,"\t$opcode\t".join(',',@_)."\n");       }
  34 }
  35 
  36 sub ::LB
  37 {   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
  38   $1."l";
  39 }
  40 sub ::HB
  41 {   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
  42   $1."h";
  43 }
  44 sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num);  }
  45 sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num);  }
  46 sub ::blindpop  { &pop($_[0]); $stack+=4;                           }
  47 sub ::wparam    { &DWP($stack+4*$_[0],"esp");                               }
  48 sub ::swtmp     { &DWP(4*$_[0],"esp");                                      }
  49 
  50 sub ::bswap
  51 {   if ($i386)  # emulate bswap for i386
  52     {   &comment("bswap @_");
  53         &xchg(&HB(@_),&LB(@_));
  54         &ror (@_,16);
  55         &xchg(&HB(@_),&LB(@_));
  56     }
  57     else
  58     {   &generic("bswap",@_);       }
  59 }
  60 # These are made-up opcodes introduced over the years essentially
  61 # by ignorance, just alias them to real ones...
  62 sub ::movb      { &mov(@_); }
  63 sub ::xorb      { &xor(@_); }
  64 sub ::rotl      { &rol(@_); }
  65 sub ::rotr      { &ror(@_); }
  66 sub ::exch      { &xchg(@_);        }
  67 sub ::halt      { &hlt;             }
  68 sub ::movz      { &movzx(@_);       }
  69 sub ::pushf     { &pushfd;  }
  70 sub ::popf      { &popfd;   }
  71 
  72 # 3 argument instructions
  73 sub ::movq
  74 { my($p1,$p2,$optimize)=@_;
  75 
  76     if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
  77     # movq between mmx registers can sink Intel CPUs
  78     {   &::pshufw($p1,$p2,0xe4);            }
  79     else
  80     {   &::generic("movq",@_);                      }
  81 }
  82 
  83 # SSE>2 instructions
  84 my %regrm = (   "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
  85                 "esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7      );
  86 sub ::pextrd
  87 { my($dst,$src,$imm)=@_;
  88     if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
  89     {   &::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm);       }
  90     else
  91     {   &::generic("pextrd",@_);            }
  92 }
  93 
  94 sub ::pinsrd
  95 { my($dst,$src,$imm)=@_;
  96     if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
  97     {   &::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm);       }
  98     else
  99     {   &::generic("pinsrd",@_);            }
 100 }
 101 
 102 sub ::pshufb
 103 { my($dst,$src)=@_;
 104     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
 105     {   &data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2);      }
 106     else
 107     {   &::generic("pshufb",@_);            }
 108 }
 109 
 110 sub ::palignr
 111 { my($dst,$src,$imm)=@_;
 112     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
 113     {   &::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm);       }
 114     else
 115     {   &::generic("palignr",@_);           }
 116 }
 117 
 118 sub ::pclmulqdq
 119 { my($dst,$src,$imm)=@_;
 120     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
 121     {   &::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm);       }
 122     else
 123     {   &::generic("pclmulqdq",@_);         }
 124 }
 125 
 126 sub ::rdrand
 127 { my ($dst)=@_;
 128     if ($dst =~ /(e[a-dsd][ixp])/)
 129     {   &::data_byte(0x0f,0xc7,0xf0|$regrm{$dst});  }
 130     else
 131     {   &::generic("rdrand",@_);    }
 132 }
 133 
 134 # label management
 135 $lbdecor="L";           # local label decoration, set by package
 136 $label="000";
 137 
 138 sub ::islabel           # see is argument is a known label
 139 { my $i;
 140     if ($_[0] eq "_GLOBAL_OFFSET_TABLE_") { return $_[0]; }
 141     foreach $i (values %label) { return $i if ($i eq $_[0]); }
 142   $label{$_[0]};        # can be undef
 143 }
 144 
 145 sub ::label             # instantiate a function-scope label
 146 {   if (!defined($label{$_[0]}))
 147     {   $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
 148   $label{$_[0]};
 149 }
 150 
 151 sub ::LABEL             # instantiate a file-scope label
 152 {   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
 153   $label{$_[0]};
 154 }
 155 
 156 sub ::static_label      { &::LABEL($_[0],$lbdecor.$_[0]); }
 157 
 158 sub ::set_label_B       { push(@out,"@_:\n"); }
 159 sub ::set_label
 160 { my $label=&::label($_[0]);
 161     &::align($_[1]) if ($_[1]>1);
 162     &::set_label_B($label);
 163   $label;
 164 }
 165 
 166 sub ::wipe_labels       # wipes function-scope labels
 167 {   foreach $i (keys %label)
 168     {   delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
 169 }
 170 
 171 # subroutine management
 172 sub ::function_begin
 173 {   &function_begin_B(@_);
 174     $stack=4;
 175     &push("ebp");
 176     &push("ebx");
 177     &push("esi");
 178     &push("edi");
 179 }
 180 
 181 sub ::function_end
 182 {   &pop("edi");
 183     &pop("esi");
 184     &pop("ebx");
 185     &pop("ebp");
 186     &ret();
 187     &function_end_B(@_);
 188     $stack=0;
 189     &wipe_labels();
 190 }
 191 
 192 sub ::function_end_A
 193 {   &pop("edi");
 194     &pop("esi");
 195     &pop("ebx");
 196     &pop("ebp");
 197     &ret();
 198     $stack+=16; # readjust esp as if we didn't pop anything
 199 }
 200 
 201 sub ::asciz
 202 { my @str=unpack("C*",shift);
 203     push @str,0;
 204     while ($#str>15) {
 205         &data_byte(@str[0..15]);
 206         foreach (0..15) { shift @str; }
 207     }
 208     &data_byte(@str) if (@str);
 209 }
 210 
 211 sub ::asm_finish
 212 {   &file_end();
 213     print @out;
 214 }
 215 
 216 sub ::asm_init
 217 { my ($type,$fn,$cpu)=@_;
 218 
 219     $filename=$fn;
 220     $i386=$cpu;
 221 
 222     $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$android=0;
 223     if    (($type eq "elf"))
 224     {   $elf=1;                 require "x86gas.pl";    }
 225     elsif (($type eq "a\.out"))
 226     {   $aout=1;                require "x86gas.pl";    }
 227     elsif (($type eq "coff" or $type eq "gaswin"))
 228     {   $coff=1;                require "x86gas.pl";    }
 229     elsif (($type eq "win32n"))
 230     {   $win32=1;               require "x86nasm.pl";   }
 231     elsif (($type eq "nw-nasm"))
 232     {   $netware=1;             require "x86nasm.pl";   }
 233     #elsif (($type eq "nw-mwasm"))
 234     #{  $netware=1; $mwerks=1;  require "x86nasm.pl";   }
 235     elsif (($type eq "win32"))
 236     {   $win32=1;               require "x86masm.pl";   }
 237     elsif (($type eq "macosx"))
 238     {   $aout=1; $macosx=1;     require "x86gas.pl";    }
 239     elsif (($type eq "android"))
 240     {   $elf=1; $android=1;     require "x86gas.pl";    }
 241     else
 242     {   print STDERR <<"EOF";
 243 Pick one target type from
 244         elf     - Linux, FreeBSD, Solaris x86, etc.
 245         a.out   - DJGPP, elder OpenBSD, etc.
 246         coff    - GAS/COFF such as Win32 targets
 247         win32n  - Windows 95/Windows NT NASM format
 248         nw-nasm - NetWare NASM format
 249         macosx  - Mac OS X
 250 EOF
 251         exit(1);
 252     }
 253 
 254     $pic=0;
 255     for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
 256 
 257     $filename =~ s/\.pl$//;
 258     &file($filename);
 259 }
 260 
 261 sub ::hidden {}
 262 
 263 1;