Throw in x86_64 AT&T to MASM assembler converter to facilitate development
authorAndy Polyakov <appro@openssl.org>
Sun, 17 Apr 2005 21:05:57 +0000 (21:05 +0000)
committerAndy Polyakov <appro@openssl.org>
Sun, 17 Apr 2005 21:05:57 +0000 (21:05 +0000)
of dual-ABI Unix/Win64 modules.

crypto/perlasm/x86_64-xlate.pl [new file with mode: 0755]
crypto/rc4/asm/rc4-amd64.pl

diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl
new file mode 100755 (executable)
index 0000000..33ffc41
--- /dev/null
@@ -0,0 +1,459 @@
+#!/usr/bin/env perl
+
+# Ascetic x86_64 AT&T to MASM assembler translator by <appro>.
+#
+# Why AT&T to MASM and not vice versa? Several reasons. Because AT&T
+# format is way easier to parse. Because it's simpler to "gear" from
+# Unix ABI to Windows one [see cross-reference "card" at the end of
+# file]. Because Linux targets were available first...
+#
+# In addition the script also "distills" code suitable for GNU
+# assembler, so that it can be compiled with more rigid assemblers,
+# such as Solaris /usr/ccs/bin/as.
+#
+# This translator is not designed to convert *arbitrary* assembler
+# code from AT&T format to MASM one. It's designed to convert just
+# enough to provide for dual-ABI OpenSSL modules development...
+# There *are* limitations and you might have to modify your assembler
+# code or this script to achieve the desired result...
+#
+# Currently recognized limitations:
+#
+# - can't use multiple ops per line;
+# - indirect calls and jumps are not supported;
+#
+# Dual-ABI styling rules.
+#
+# 1. Adhere to Unix register and stack layout [see the end for
+#    explanation].
+# 2. Forget about "red zone," stick to more traditional blended
+#    stack frame allocation. If volatile storage is actually required
+#    that is. If not, just leave the stack as is.
+# 3. Functions tagged with ".type name,@function" get crafted with
+#    unified Windows prologue and epilogue automatically. If you want
+#    to take care of ABI differences yourself, tag functions as
+#    ".type name,@abi-omnipotent."
+# 4. As minor optimization you can specify number of input arguments
+#    as ".type name,@function,N." Keep in mind that if N is larger
+#    than 6, then you *have to* write "abi-omnipotent" code, because
+#    it can't be resolved with unified prologue.
+# 5. Name local labels as .L*.
+# 6. Don't use repret, it's generated automatically.
+
+my $output = shift;
+open STDOUT,">$output" || die "can't open $output: $!";
+
+my $masm=1 if ($output =~ /\.asm/);
+
+my $current_segment;
+my $current_function;
+
+{ package opcode;      # pick up opcodes
+    sub re {
+       my      $self = shift;  # single instance in enough...
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /^([a-z]+)/i) {
+           $self->{op} = $1;
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
+           undef $self->{sz};
+           if ($self->{op} =~ /(movz)b.*/) {   # movz is pain...
+               $self->{op} = $1;
+               $self->{sz} = "b";
+           } elsif ($self->{op} =~ /([a-z]{3,})([qlwb])/) {
+               $self->{op} = $1;
+               $self->{sz} = $2;
+           }
+       }
+       $ret;
+    }
+    sub size {
+       my $self = shift;
+       my $sz   = shift;
+       $self->{sz} = $sz if (defined($sz) && !defined($self->{sz}));
+       $self->{sz};
+    }
+    sub out {
+       my $self = shift;
+       if (!$masm) {
+           if ($self->{op} eq "movz") {        # movz in pain...
+               sprintf "%s%s%s",$self->{op},$self->{sz},shift;
+           } elsif ($self->{op} eq "ret") {
+               ".byte  0xf3,0xc3";
+           } else {
+               "$self->{op}$self->{sz}";
+           }
+       } else {
+           $self->{op} =~ s/movz/movzx/;
+           if ($self->{op} eq "ret") {
+               $self->{op} = "";
+               if ($current_function->{abi} eq "svr4") {
+                   $self->{op} = "mov  rdi,QWORD PTR 8[rsp]\t;WIN64 epilogue\n\t".
+                                 "mov  rsi,QWORD PTR 16[rsp]\n\t";
+               }
+               $self->{op} .= "DB\t0F3h,0C3h\t\t;repret";
+           }
+           $self->{op};
+       }
+    }
+}
+{ package const;       # pick up constants, which start with $
+    sub re {
+       my      $self = shift;  # single instance in enough...
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /^\$([^,]+)/) {
+           $self->{value} = $1;
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+       }
+       $ret;
+    }
+    sub out {
+       my $self = shift;
+       sprintf $masm?"%s":"\$%s",$self->{value};
+    }
+}
+{ package ea;          # pick up effective addresses: expr(%reg,%reg,scale)
+    sub re {
+       my      $self = shift;  # single instance in enough...
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /^([^\(,]*)\(([%\w,]+)\)/) {
+           $self->{label} = $1;
+           ($self->{base},$self->{index},$self->{scale})=split(/,/,$2);
+           $self->{scale} = 1 if (!defined($self->{scale}));
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
+           $self->{label} =~ s/\.L/\$L/g;
+           $self->{base}  =~ s/^%//;
+           $self->{index} =~ s/^%// if (defined($self->{index}));
+       }
+       $ret;
+    }
+    sub size {}
+    sub out {
+       my $self = shift;
+       my $sz = shift;
+
+       if (!$masm) {
+           if (defined($self->{index})) {
+               sprintf "%s(%%%s,%%%s,%d)",     $self->{label},$self->{base},
+                                       $self->{index},$self->{scale};
+           }
+           else {
+               sprintf "%s(%%%s)",     $self->{label},$self->{base};
+           }
+       } else {
+           %szmap = ( b=>"BYTE", w=>"WORD", l=>"DWORD", q=>"QWORD" );
+
+           if (defined($self->{index})) {
+               sprintf "%s PTR %s[%s*%d+%s]",$szmap{$sz},
+                                       $self->{label},
+                                       $self->{index},$self->{scale},
+                                       $self->{base};
+           }
+           else {
+               sprintf "%s PTR %s[%s]",$szmap{$sz},
+                                       $self->{label},$self->{base};
+           }
+       }
+    }
+}
+{ package register;    # pick up registers, which start with %.
+    sub re {
+       my      $class = shift; # muliple instances...
+       my      $self = {};
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /^%(\w+)/) {
+           bless $self,$class;
+           $self->{value} = $1;
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+       }
+       $ret;
+    }
+    sub size {
+       my      $self = shift;
+       undef   $ret;
+
+       if    ($self->{value} =~ /^r[\d]+b$/i)  { $ret="b"; }
+       elsif ($self->{value} =~ /^r[\d]+w$/i)  { $ret="w"; }
+       elsif ($self->{value} =~ /^r[\d]+d$/i)  { $ret="l"; }
+       elsif ($self->{value} =~ /^r[\w]+$/i)   { $ret="q"; }
+       elsif ($self->{value} =~ /^[a-d][hl]$/i){ $ret="b"; }
+       elsif ($self->{value} =~ /^[\w]{2}l$/i) { $ret="b"; }
+       elsif ($self->{value} =~ /^[\w]{2}$/i)  { $ret="w"; }
+       elsif ($self->{value} =~ /^e[a-z]{2}$/i){ $ret="l"; }
+
+       $ret;
+    }
+    sub out {
+       my $self = shift;
+       sprintf $masm?"%s":"%%%s",$self->{value};
+    }
+}
+{ package label;       # pick up labels, which end with :
+    sub re {
+       my      $self = shift;  # single instance is enough...
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /(^[\.\w]+\:)/) {
+           $self->{value} = $1;
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
+           $self->{value} =~ s/\.L/\$L/ if ($masm);
+       }
+       $ret;
+    }
+    sub out {
+       my $self = shift;
+
+       if (!$masm) {
+           $self->{value};
+       } elsif ($self->{value} ne "$current_function->{name}:") {
+           $self->{value};
+       } elsif ($current_function->{abi} eq "svr4") {
+           my $func =  "$current_function->{name}      PROC\n".
+                       "       mov     QWORD PTR 8[rsp],rdi\t;WIN64 prologue\n".
+                       "       mov     QWORD PTR 16[rsp],rsi\n";
+           my $narg = $current_function->{narg};
+           $narg=6 if (!defined($narg));
+           $func .= "  mov     rdi,rcx\n" if ($narg>0);
+           $func .= "  mov     rsi,rdx\n" if ($narg>1);
+           $func .= "  mov     rdx,r8\n"  if ($narg>2);
+           $func .= "  mov     rcx,r9\n"  if ($narg>3);
+           $func .= "  mov     r8,QWORD PTR 40[rsp]\n" if ($narg>4);
+           $func .= "  mov     r9,QWORD PTR 48[rsp]\n" if ($narg>5);
+           $func .= "\n";
+       } else {
+          "$current_function->{name}   PROC";
+       }
+    }
+}
+{ package expr;                # pick up expressioins
+    sub re {
+       my      $self = shift;  # single instance is enough...
+       local   *line = shift;
+       undef   $ret;
+
+       if ($line =~ /(^[^,]+)/) {
+           $self->{value} = $1;
+           $ret = $self;
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
+           $self->{value} =~ s/\.L/\$L/g if ($masm);
+       }
+       $ret;
+    }
+    sub out {
+       my $self = shift;
+       $self->{value};
+    }
+}
+{ package directive;   # pick up directives, which start with .
+    sub re {
+       my      $self = shift;  # single instance is enough...
+       local   *line = shift;
+       undef   $ret;
+       my      $dir;
+
+       if ($line =~ /^\s*(\.\w+)/) {
+           if (!$masm) {
+               $self->{value} = $1;
+               $line =~ s/\@abi\-omnipotent/\@function/;
+               $line =~ s/\@function.*/\@function/;
+               $self->{value} = $line;
+               $line = "";
+               return $self;
+           }
+
+           $dir = $1;
+           $ret = $self;
+           undef $self->{value};
+           $line = substr($line,@+[0]); $line =~ s/^\s+//;
+           SWITCH: for ($dir) {
+               /\.(text|data)/
+                           && do { my $v=undef;
+                                   $v="$current_segment\tENDS\n" if ($current_segment);
+                                   $current_segment = "_$1";
+                                   $current_segment =~ tr/[a-z]/[A-Z]/;
+                                   $v.="$current_segment\tSEGMENT PARA";
+                                   $self->{value} = $v;
+                                   last;
+                                 };
+               /\.globl/   && do { $self->{value} = "PUBLIC\t".$line; last; };
+               /\.type/    && do { ($sym,$type,$narg) = split(',',$line);
+                                   if ($type eq "\@function")
+                                   {   undef $current_function;
+                                       $current_function->{name} = $sym;
+                                       $current_function->{abi}  = "svr4";
+                                       $current_function->{narg} = $narg;
+                                   }
+                                   elsif ($type eq "\@abi-omnipotent")
+                                   {   undef $current_function;
+                                       $current_function->{name} = $sym;
+                                   }
+                                   last;
+                                 };
+               /\.size/    && do { if (defined($current_function))
+                                   {   $self->{value}="$current_function->{name}\tENDP";
+                                       undef $current_function;
+                                   }
+                                   last;
+                                 };
+               /\.align/   && do { $self->{value} = "ALIGN\t".$line; last; };
+               /\.(byte|value|long|quad)/
+                           && do { my @arr = split(',',$line);
+                                   my $sz  = substr($1,0,1);
+                                   my $last = pop(@arr);
+
+                                   $sz =~ tr/bvlq/BWDQ/;
+                                   $self->{value} = "\tD$sz\t";
+                                   for (@arr) { $self->{value} .= sprintf"0%Xh,",oct; }
+                                   $self->{value} .= sprintf"0%Xh",oct($last);
+                                   last;
+                                 };
+           }
+           $line = "";
+       }
+
+       $ret;
+    }
+    sub out {
+       my $self = shift;
+       $self->{value};
+    }
+}
+
+while($line=<>) {
+
+    chomp($line);
+
+    $line =~ s/\[#!].*$//;     # get rid of comments...
+    $line =~ s/^\s+//;         # ... and skip white spaces
+
+    undef $label;
+    undef $opcode;
+    undef $dst;
+    undef $src;
+    undef $sz;
+
+    if ($label=label->re(\$line))      { print $label->out(); }
+
+    if (directive->re(\$line)) {
+       printf "%s",directive->out();
+    } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: {
+
+       if ($src=register->re(\$line))  { opcode->size($src->size()); }
+       elsif ($src=const->re(\$line))  { }
+       elsif ($src=ea->re(\$line))     { }
+       elsif ($src=expr->re(\$line))   { }
+
+       last ARGUMENT if ($line !~ /^,/);
+
+       $line = substr($line,1); $line =~ s/^\s+//;
+
+       if ($dst=register->re(\$line))  { opcode->size($dst->size()); }
+       elsif ($dst=const->re(\$line))  { }
+       elsif ($dst=ea->re(\$line))     { }
+
+       } # ARGUMENT:
+
+       $sz=opcode->size();
+
+       if (defined($dst)) {
+           if (!$masm) {
+               printf "\t%s\t%s,%s",   $opcode->out($dst->size()),
+                                       $src->out($sz),$dst->out($sz);
+           }
+           else {
+               printf "\t%s\t%s,%s",   $opcode->out(),
+                                       $dst->out($sz),$src->out($sz);
+           }
+       }
+       elsif (defined($src)) {
+           printf "\t%s\t%s",$opcode->out(),$src->out($sz);
+       } else {
+           printf "\t%s",$opcode->out();
+       }
+    }
+
+    print $line,"\n";
+}
+
+print "\n$current_segment\tENDS\nEND\n" if ($masm);
+
+close STDOUT;
+
+#################################################
+# Cross-reference x86_64 ABI "card"
+#
+#              Unix            Win64
+# %rax         *               *
+# %rbx         -               -
+# %rcx         #4              #1
+# %rdx         #3              #2
+# %rsi         #2              -
+# %rdi         #1              -
+# %rbp         -               -
+# %rsp         -               -
+# %r8          #5              #3
+# %r9          #6              #4
+# %r10         *               *
+# %r11         *               *
+# %r12         -               -
+# %r13         -               -
+# %r14         -               -
+# %r15         -               -
+# 
+# (*)  volatile register
+# (-)  preserved by callee
+# (#)  Nth argument, volatile
+#
+# In Unix terms top of stack is argument transfer area for arguments
+# which could not be accomodated in registers. Or in other words 7th
+# [integer] argument resides at 8(%rsp) upon function entry point.
+# 128 bytes above %rsp constitute a "red zone" which is not touched
+# by signal handlers and can be used as temporal storage without
+# allocating a frame.
+#
+# In Win64 terms N*8 bytes on top of stack is argument transfer area,
+# which belongs to/can be overwritten by callee. N is the number of
+# arguments passed to callee, *but* not less than 4! This means that
+# upon function entry point 5th argument resides at 40(%rsp), as well
+# as that 32 bytes from 8(%rsp) can always be used as temporal
+# storage [without allocating a frame].
+#
+# All the above means that if assembler programmer adheres to Unix
+# register and stack layout, but disregards the "red zone" existense,
+# it's possible to use following prologue and epilogue to "gear" from
+# Unix to Win64 ABI in leaf functions with not more than 6 arguments.
+#
+# omnipotent_function:
+# ifdef WIN64
+#      movq    %rdi,8(%rsp)
+#      movq    %rsi,16(%rsp)
+#      movq    %rcx,%rdi       ; if 1st argument is actually present
+#      movq    %rdx,%rsi       ; if 2nd argument is actually ...
+#      movq    %r8,%rdx        ; if 3rd argument is ...
+#      movq    %r9,%rcx        ; if 4th argument ...
+#      movq    40(%rsp),%r8    ; if 5th ...
+#      movq    48(%rsp),%r9    ; if 6th ...
+# endif
+#      ...
+# ifdef WIN64
+#      movq    8(%rsp),%rdi
+#      movq    16(%rsp),%rsi
+# endif
+#      ret
index 2d3dedd..d425318 100755 (executable)
 # of code remain redundant.
 
 $output=shift;
+open STDOUT,"| $^X ../perlasm/x86_64-xlate.pl $output";
 
-$win64a=1 if ($output =~ /win64a.[s|asm]/);
-
-open STDOUT,">$output" || die "can't open $output: $!";
-
-if (defined($win64a)) {
-    $dat="%rcx";       # arg1
-    $len="%rdx";       # arg2
-    $inp="%rsi";       # r8, arg3 moves here
-    $out="%rdi";       # r9, arg4 moves here
-} else {
-    $dat="%rdi";       # arg1
-    $len="%rsi";       # arg2
-    $inp="%rdx";       # arg3
-    $out="%rcx";       # arg4
-}
+$dat="%rdi";       # arg1
+$len="%rsi";       # arg2
+$inp="%rdx";       # arg3
+$out="%rcx";       # arg4
 
 $XX="%r10";
 $TX="%r8";
 $YY="%r11";
 $TY="%r9";
 
-sub PTR() {
-    my $ret=shift;
-    if (defined($win64a)) {
-       $ret =~ s/\[([\S]+)\+([\S]+)\]/[$2+$1]/g;   # [%rN+%rM*4]->[%rM*4+%rN]
-       $ret =~ s/:([^\[]+)\[([^\]]+)\]/:[$2+$1]/g; # :off[ea]->:[ea+off]
-    } else {
-       $ret =~ s/[\+\*]/,/g;           # [%rN+%rM*4]->[%rN,%rM,4]
-       $ret =~ s/\[([^\]]+)\]/($1)/g;  # [%rN]->(%rN)
-    }
-    $ret;
-}
-
-$code=<<___ if (!defined($win64a));
+$code=<<___;
 .text
 
 .globl RC4
-.type  RC4,\@function
+.type  RC4,\@function,4
 .align 16
 RC4:   or      $len,$len
        jne     .Lentry
-       repret
+       ret
 .Lentry:
-___
-$code=<<___ if (defined($win64a));
-_TEXT  SEGMENT
-PUBLIC RC4
-ALIGN  16
-RC4    PROC
-       or      $len,$len
-       jne     .Lentry
-       repret
-.Lentry:
-       push    %rdi
-       push    %rsi
-       sub     \$40,%rsp
-       mov     %r8,$inp
-       mov     %r9,$out
-___
-$code.=<<___;
        add     \$8,$dat
-       movl    `&PTR("DWORD:-8[$dat]")`,$XX#d
-       movl    `&PTR("DWORD:-4[$dat]")`,$YY#d
-       cmpl    \$-1,`&PTR("DWORD:256[$dat]")`
+       movl    -8($dat),$XX#d
+       movl    -4($dat),$YY#d
+       cmpl    \$-1,256($dat)
        je      .LRC4_CHAR
        test    \$-8,$len
        jz      .Lloop1
 .align 16
 .Lloop8:
        inc     $XX#b
-       movl    `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+       movl    ($dat,$XX,4),$TX#d
        add     $TX#b,$YY#b
-       movl    `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
-       movl    $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
-       movl    $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+       movl    ($dat,$YY,4),$TY#d
+       movl    $TX#d,($dat,$YY,4)
+       movl    $TY#d,($dat,$XX,4)
        add     $TX#b,$TY#b
        inc     $XX#b
-       movl    `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
-       movb    `&PTR("BYTE:[$dat+$TY*4]")`,%al
+       movl    ($dat,$XX,4),$TX#d
+       movb    ($dat,$TY,4),%al
 ___
 for ($i=1;$i<=6;$i++) {
 $code.=<<___;
        add     $TX#b,$YY#b
        ror     \$8,%rax
-       movl    `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
-       movl    $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
-       movl    $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+       movl    ($dat,$YY,4),$TY#d
+       movl    $TX#d,($dat,$YY,4)
+       movl    $TY#d,($dat,$XX,4)
        add     $TX#b,$TY#b
        inc     $XX#b
-       movl    `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
-       movb    `&PTR("BYTE:[$dat+$TY*4]")`,%al
+       movl    ($dat,$XX,4),$TX#d
+       movb    ($dat,$TY,4),%al
 ___
 }
 $code.=<<___;
        add     $TX#b,$YY#b
        ror     \$8,%rax
-       movl    `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
-       movl    $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
-       movl    $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+       movl    ($dat,$YY,4),$TY#d
+       movl    $TX#d,($dat,$YY,4)
+       movl    $TY#d,($dat,$XX,4)
        sub     \$8,$len
        add     $TY#b,$TX#b
-       movb    `&PTR("BYTE:[$dat+$TX*4]")`,%al
+       movb    ($dat,$TX,4),%al
        ror     \$8,%rax
        add     \$8,$inp
        add     \$8,$out
 
-       xor     `&PTR("QWORD:-8[$inp]")`,%rax
-       mov     %rax,`&PTR("QWORD:-8[$out]")`
+       xor     -8($inp),%rax
+       mov     %rax,-8($out)
 
        test    \$-8,$len
        jnz     .Lloop8
        cmp     \$0,$len
        jne     .Lloop1
 .Lexit:
-       movl    $XX#d,`&PTR("DWORD:-8[$dat]")`
-       movl    $YY#d,`&PTR("DWORD:-4[$dat]")`
-___
-$code.=<<___ if (defined($win64a));
-       add     \$40,%rsp
-       pop     %rsi
-       pop     %rdi
-___
-$code.=<<___;
-       repret
+       movl    $XX#d,-8($dat)
+       movl    $YY#d,-4($dat)
+       ret
 .align 16
 .Lloop1:
-       movzb   `&PTR("BYTE:[$inp]")`,%eax
+       movzb   ($inp),%eax
        inc     $XX#b
-       movl    `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+       movl    ($dat,$XX,4),$TX#d
        add     $TX#b,$YY#b
-       movl    `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
-       movl    $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
-       movl    $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+       movl    ($dat,$YY,4),$TY#d
+       movl    $TX#d,($dat,$YY,4)
+       movl    $TY#d,($dat,$XX,4)
        add     $TY#b,$TX#b
-       movl    `&PTR("DWORD:[$dat+$TX*4]")`,$TY#d
+       movl    ($dat,$TX,4),$TY#d
        xor     $TY,%rax
        inc     $inp
-       movb    %al,`&PTR("BYTE:[$out]")`
+       movb    %al,($out)
        inc     $out
        dec     $len
        jnz     .Lloop1
@@ -182,46 +136,25 @@ $code.=<<___;
 .align 16
 .LRC4_CHAR:
        add     \$1,$XX#b
-       movzb   `&PTR("BYTE:[$dat+$XX]")`,$TX#d
+       movzb   ($dat,$XX),$TX#d
        add     $TX#b,$YY#b
-       movzb   `&PTR("BYTE:[$dat+$YY]")`,$TY#d
-       movb    $TX#b,`&PTR("BYTE:[$dat+$YY]")`
-       movb    $TY#b,`&PTR("BYTE:[$dat+$XX]")`
+       movzb   ($dat,$YY),$TY#d
+       movb    $TX#b,($dat,$YY)
+       movb    $TY#b,($dat,$XX)
        add     $TX#b,$TY#b
-       movzb   `&PTR("BYTE:[$dat+$TY]")`,$TY#d
-       xorb    `&PTR("BYTE:[$inp]")`,$TY#b
-       movb    $TY#b,`&PTR("BYTE:[$out]")`
+       movzb   ($dat,$TY),$TY#d
+       xorb    ($inp),$TY#b
+       movb    $TY#b,($out)
        lea     1($inp),$inp
        lea     1($out),$out
        sub     \$1,$len
        jnz     .LRC4_CHAR
        jmp     .Lexit
-___
-$code.=<<___ if (defined($win64a));
-RC4    ENDP
-_TEXT  ENDS
-END
-___
-$code.=<<___ if (!defined($win64a));
 .size  RC4,.-RC4
 ___
 
 $code =~ s/#([bwd])/$1/gm;
-$code =~ s/\`([^\`]*)\`/eval $1/gem;
 
-if (defined($win64a)) {
-    $code =~ s/\.align/ALIGN/gm;
-    $code =~ s/[\$%]//gm;
-    $code =~ s/\.L/\$L/gm;
-    $code =~ s/([\w]+)([\s]+)([\S]+),([\S]+)/$1$2$4,$3/gm;
-    $code =~ s/([QD]*WORD|BYTE):/$1 PTR/gm;
-    $code =~ s/mov[bwlq]/mov/gm;
-    $code =~ s/movzb/movzx/gm;
-    $code =~ s/repret/DB\t0F3h,0C3h/gm;
-    $code =~ s/cmpl/cmp/gm;
-    $code =~ s/xorb/xor/gm;
-} else {
-    $code =~ s/([QD]*WORD|BYTE)://gm;
-    $code =~ s/repret/.byte\t0xF3,0xC3/gm;
-}
 print $code;
+
+close STDOUT;