Engage cmll-x86_64.pl in Win64 build and make it compile correctly.
[openssl.git] / crypto / perlasm / x86_64-xlate.pl
index ef1a4ce..b4fe821 100755 (executable)
@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 
-# Ascetic x86_64 AT&T to MASM assembler translator by <appro>.
+# Ascetic x86_64 AT&T to MASM/NASM 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
 # 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].
+# 1. Adhere to Unix register and stack layout [see cross-reference
+#    ABI "card" at 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.
 # 6. Don't use [or hand-code with .byte] "rep ret." "ret" mnemonic is
 #    required to identify the spots, where to inject Win64 epilogue!
 #    But on the pros, it's then prefixed with rep automatically:-)
-# 7. Due to MASM limitations [and certain general counter-intuitivity
-#    of ip-relative addressing] generation of position-independent
-#    code is assisted by synthetic directive, .picmeup, which puts
-#    address of the *next* instruction into target register.
+# 7. Stick to explicit ip-relative addressing. If you have to use
+#    GOTPCREL addressing, stick to mov symbol@GOTPCREL(%rip),%r??.
+#    Both are recognized and translated to proper Win64 addressing
+#    modes. To support legacy code a synthetic directive, .picmeup,
+#    is implemented. It puts address of the *next* instruction into
+#    target register, e.g.:
 #
-#    Example 1:
 #              .picmeup        %rax
 #              lea             .Label-.(%rax),%rax
-#    Example 2:
-#              .picmeup        %rcx
-#      .Lpic_point:
-#              ...
-#              lea             .Label-.Lpic_point(%rcx),%rbp
-
-my $output = shift;
-open STDOUT,">$output" || die "can't open $output: $!";
+#
+# 8. In order to provide for structured exception handling unified
+#    Win64 prologue copies %rsp value to %rax. For further details
+#    see SEH paragraph at the end.
+# 9. .init segment is allowed to contain calls to functions only.
+\f
+my $flavour = shift;
+my $output  = shift;
+if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
+
+{ my ($stddev,$stdino,@junk)=stat(STDOUT);
+  my ($outdev,$outino,@junk)=stat($output);
+
+    open STDOUT,">$output" || die "can't open $output: $!"
+       if ($stddev!=$outdev || $stdino!=$outino);
+}
 
-my $masm=1 if ($output =~ /\.asm/);
+my $gas=1;     $gas=0 if ($output =~ /\.asm$/);
+my $elf=1;     $elf=0 if (!$gas);
+my $win64=0;
+my $prefix="";
+my $decor=".L";
+
+my $masmref=8 + 50727*2**-32;  # 8.00.50727 shipped with VS2005
+my $masm=0;
+my $PTR=" PTR";
+
+my $nasmref=2.03;
+my $nasm=0;
+
+if    ($flavour eq "mingw64")  { $gas=1; $elf=0; $win64=1; $prefix="_"; }
+elsif ($flavour eq "macosx")   { $gas=1; $elf=0; $prefix="_"; $decor="L\$"; }
+elsif ($flavour eq "masm")     { $gas=0; $elf=0; $masm=$masmref; $win64=1; $decor="\$L\$"; }
+elsif ($flavour eq "nasm")     { $gas=0; $elf=0; $nasm=$nasmref; $win64=1; $decor="\$L\$"; $PTR=""; }
+elsif (!$gas)
+{   if ($ENV{ASM} =~ m/nasm/ && `nasm -v` =~ m/version ([0-9]+)\.([0-9]+)/i)
+    {  $nasm = $1 + $2*0.01; $PTR="";  }
+    elsif (`ml64 2>&1` =~ m/Version ([0-9]+)\.([0-9]+)(\.([0-9]+))?/)
+    {  $masm = $1 + $2*2**-16 + $4*2**-32;   }
+    die "no assembler found on %PATH" if (!($nasm || $masm));
+    $win64=1;
+    $elf=0;
+    $decor="\$L\$";
+}
 
 my $current_segment;
 my $current_function;
+my %globals;
 
 { package opcode;      # pick up opcodes
     sub re {
@@ -70,16 +105,18 @@ my $current_function;
        local   *line = shift;
        undef   $ret;
 
-       if ($line =~ /^([a-z]+)/i) {
+       if ($line =~ /^([a-z][a-z0-9]*)/i) {
            $self->{op} = $1;
            $ret = $self;
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
 
            undef $self->{sz};
-           if ($self->{op} =~ /(movz)b.*/) {   # movz is pain...
+           if ($self->{op} =~ /^(movz)b.*/) {  # movz is pain...
                $self->{op} = $1;
                $self->{sz} = "b";
-           } elsif ($self->{op} =~ /([a-z]{3,})([qlwb])/) {
+           } elsif ($self->{op} =~ /call|jmp/) {
+               $self->{sz} = ""
+           } elsif ($self->{op} =~ /([a-z]{3,})([qlwb])$/) {
                $self->{op} = $1;
                $self->{sz} = $2;
            }
@@ -94,27 +131,46 @@ my $current_function;
     }
     sub out {
        my $self = shift;
-       if (!$masm) {
-           if ($self->{op} eq "movz") {        # movz in pain...
+       if ($gas) {
+           if ($self->{op} eq "movz") {        # movz is pain...
                sprintf "%s%s%s",$self->{op},$self->{sz},shift;
+           } elsif ($self->{op} =~ /^set/) { 
+               "$self->{op}";
            } elsif ($self->{op} eq "ret") {
-               ".byte  0xf3,0xc3";
+               my $epilogue = "";
+               if ($win64 && $current_function->{abi} eq "svr4") {
+                   $epilogue = "movq   8(%rsp),%rdi\n\t" .
+                               "movq   16(%rsp),%rsi\n\t";
+               }
+               $epilogue . ".byte      0xf3,0xc3";
+           } elsif ($self->{op} eq "call" && !$elf && $current_segment eq ".init") {
+               ".p2align\t3\n\t.quad";
            } else {
                "$self->{op}$self->{sz}";
            }
        } else {
-           $self->{op} =~ s/movz/movzx/;
+           $self->{op} =~ s/^movz/movzx/;
            if ($self->{op} eq "ret") {
                $self->{op} = "";
-               if ($current_function->{abi} eq "svr4") {
-                   $self->{op} = "mov  rdi,QWORD PTR 8[rsp]\t;WIN64 epilogue\n\t".
-                                 "mov  rsi,QWORD PTR 16[rsp]\n\t";
+               if ($win64 && $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";
                }
                $self->{op} .= "DB\t0F3h,0C3h\t\t;repret";
-           }
+           } elsif ($self->{op} =~ /^(pop|push)f/) {
+               $self->{op} .= $self->{sz};
+           } elsif ($self->{op} eq "call" && $current_segment eq ".CRT\$XCU") {
+               $self->{op} = "ALIGN\t8\n\tDQ";
+           } 
            $self->{op};
        }
     }
+    sub mnemonic {
+       my $self=shift;
+       my $op=shift;
+       $self->{op}=$op if (defined($op));
+       $self->{op};
+    }
 }
 { package const;       # pick up constants, which start with $
     sub re {
@@ -132,10 +188,15 @@ my $current_function;
     sub out {
        my $self = shift;
 
-       if (!$masm) {
+       if ($gas) {
+           # Solaris /usr/ccs/bin/as can't handle multiplications
+           # in $self->{value}
+           $self->{value} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
+           $self->{value} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
            sprintf "\$%s",$self->{value};
        } else {
-           $self->{value} =~ s/0x([0-9a-f]+)/0$1h/ig;
+           $self->{value} =~ s/(0b[0-1]+)/oct($1)/eig;
+           $self->{value} =~ s/0x([0-9a-f]+)/0$1h/ig if ($masm);
            sprintf "%s",$self->{value};
        }
     }
@@ -146,13 +207,19 @@ my $current_function;
        local   *line = shift;
        undef   $ret;
 
-       if ($line =~ /^([^\(,]*)\(([%\w,]+)\)/) {
-           $self->{label} = $1;
-           ($self->{base},$self->{index},$self->{scale})=split(/,/,$2);
+       # optional * ---vvv--- appears in indirect jmp/call
+       if ($line =~ /^(\*?)([^\(,]*)\(([%\w,]+)\)/) {
+           $self->{asterisk} = $1;
+           $self->{label} = $2;
+           ($self->{base},$self->{index},$self->{scale})=split(/,/,$3);
            $self->{scale} = 1 if (!defined($self->{scale}));
            $ret = $self;
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
 
+           if ($win64 && $self->{label} =~ s/\@GOTPCREL//) {
+               die if (opcode->mnemonic() ne "mov");
+               opcode->mnemonic("lea");
+           }
            $self->{base}  =~ s/^%//;
            $self->{index} =~ s/^%// if (defined($self->{index}));
        }
@@ -163,38 +230,48 @@ my $current_function;
        my $self = shift;
        my $sz = shift;
 
-       if (!$masm) {
-           # elder GNU assembler insists on 64-bit EAs:-(
-           # on pros side, this results in more compact code:-)
-           $self->{index} =~ s/^[er](.?[0-9xp])[d]?$/r\1/;
-           $self->{base}  =~ s/^[er](.?[0-9xp])[d]?$/r\1/;
+       $self->{label} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+       $self->{label} =~ s/\.L/$decor/g;
+
+       # Silently convert all EAs to 64-bit. This is required for
+       # elder GNU assembler and results in more compact code,
+       # *but* most importantly AES module depends on this feature!
+       $self->{index} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
+       $self->{base}  =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
+
+       if ($gas) {
            # Solaris /usr/ccs/bin/as can't handle multiplications
            # in $self->{label}
-           $self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/eg;
+           $self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
            $self->{label} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
+           $self->{label} =~ s/^___imp_/__imp__/   if ($flavour eq "mingw64");
 
            if (defined($self->{index})) {
-               sprintf "%s(%%%s,%%%s,%d)",
+               sprintf "%s%s(%%%s,%%%s,%d)",$self->{asterisk},
                                        $self->{label},$self->{base},
                                        $self->{index},$self->{scale};
            } else {
-               sprintf "%s(%%%s)",     $self->{label},$self->{base};
+               sprintf "%s%s(%%%s)",   $self->{asterisk},$self->{label},$self->{base};
            }
        } else {
-           %szmap = ( b=>"BYTE", w=>"WORD", l=>"DWORD", q=>"QWORD" );
+           %szmap = ( b=>"BYTE$PTR", w=>"WORD$PTR", l=>"DWORD$PTR", q=>"QWORD$PTR" );
 
            $self->{label} =~ s/\./\$/g;
            $self->{label} =~ s/0x([0-9a-f]+)/0$1h/ig;
            $self->{label} = "($self->{label})" if ($self->{label} =~ /[\*\+\-\/]/);
+           $sz="q" if ($self->{asterisk});
 
            if (defined($self->{index})) {
-               sprintf "%s PTR %s[%s*%d+%s]",$szmap{$sz},
-                                       $self->{label},
+               sprintf "%s[%s%s*%d+%s]",$szmap{$sz},
+                                       $self->{label}?"$self->{label}+":"",
                                        $self->{index},$self->{scale},
                                        $self->{base};
+           } elsif ($self->{base} eq "rip") {
+               sprintf "%s[%s]",$szmap{$sz},$self->{label};
            } else {
-               sprintf "%s PTR %s[%s]",$szmap{$sz},
-                                       $self->{label},$self->{base};
+               sprintf "%s[%s%s]",$szmap{$sz},
+                                       $self->{label}?"$self->{label}+":"",
+                                       $self->{base};
            }
        }
     }
@@ -206,9 +283,11 @@ my $current_function;
        local   *line = shift;
        undef   $ret;
 
-       if ($line =~ /^%(\w+)/) {
+       # optional * ---vvv--- appears in indirect jmp/call
+       if ($line =~ /^(\*?)%(\w+)/) {
            bless $self,$class;
-           $self->{value} = $1;
+           $self->{asterisk} = $1;
+           $self->{value} = $2;
            $ret = $self;
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
        }
@@ -231,7 +310,8 @@ my $current_function;
     }
     sub out {
        my $self = shift;
-       sprintf $masm?"%s":"%%%s",$self->{value};
+       if ($gas)       { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
+       else            { $self->{value}; }
     }
 }
 { package label;       # pick up labels, which end with :
@@ -240,37 +320,63 @@ my $current_function;
        local   *line = shift;
        undef   $ret;
 
-       if ($line =~ /(^[\.\w]+\:)/) {
+       if ($line =~ /(^[\.\w]+)\:/) {
            $self->{value} = $1;
            $ret = $self;
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
 
-           $self->{value} =~ s/\.L/\$L/ if ($masm);
+           $self->{value} =~ s/^\.L/$decor/;
        }
        $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";
+       if ($gas) {
+           my $func = ($globals{$self->{value}} or $self->{value}) . ":";
+           if ($win64  &&
+                       $current_function->{name} eq $self->{value} &&
+                       $current_function->{abi} eq "svr4") {
+               $func .= "\n";
+               $func .= "      movq    %rdi,8(%rsp)\n";
+               $func .= "      movq    %rsi,16(%rsp)\n";
+               $func .= "      movq    %rsp,%rax\n";
+               $func .= "${decor}SEH_begin_$current_function->{name}:\n";
+               my $narg = $current_function->{narg};
+               $narg=6 if (!defined($narg));
+               $func .= "      movq    %rcx,%rdi\n" if ($narg>0);
+               $func .= "      movq    %rdx,%rsi\n" if ($narg>1);
+               $func .= "      movq    %r8,%rdx\n"  if ($narg>2);
+               $func .= "      movq    %r9,%rcx\n"  if ($narg>3);
+               $func .= "      movq    40(%rsp),%r8\n" if ($narg>4);
+               $func .= "      movq    48(%rsp),%r9\n" if ($narg>5);
+           }
+           $func;
+       } elsif ($self->{value} ne "$current_function->{name}") {
+           $self->{value} .= ":" if ($masm && $ret!~m/^\$/);
+           $self->{value} . ":";
+       } elsif ($win64 && $current_function->{abi} eq "svr4") {
+           my $func =  "$current_function->{name}" .
+                       ($nasm ? ":" : "\tPROC $current_function->{scope}") .
+                       "\n";
+           $func .= "  mov     QWORD${PTR}[8+rsp],rdi\t;WIN64 prologue\n";
+           $func .= "  mov     QWORD${PTR}[16+rsp],rsi\n";
+           $func .= "  mov     rax,rsp\n";
+           $func .= "${decor}SEH_begin_$current_function->{name}:";
+           $func .= ":" if ($masm);
+           $func .= "\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);
+           $func .= "  mov     r8,QWORD${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";
+          "$current_function->{name}".
+                       ($nasm ? ":" : "\tPROC $current_function->{scope}");
        }
     }
 }
@@ -285,13 +391,19 @@ my $current_function;
            $ret = $self;
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
 
-           $self->{value} =~ s/\.L/\$L/g if ($masm);
+           $self->{value} =~ s/\@PLT// if (!$elf);
+           $self->{value} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+           $self->{value} =~ s/\.L/$decor/g;
        }
        $ret;
     }
     sub out {
        my $self = shift;
-       $self->{value};
+       if ($nasm && opcode->mnemonic()=~m/^j/) {
+           "NEAR ".$self->{value};
+       } else {
+           $self->{value};
+       }
     }
 }
 { package directive;   # pick up directives, which start with .
@@ -311,65 +423,181 @@ my $current_function;
                        "%r14"=>0x01358d4c,     "%r15"=>0x013d8d4c      );
 
        if ($line =~ /^\s*(\.\w+)/) {
-           if (!$masm) {
-               $self->{value} = $1;
-               $line =~ s/\@abi\-omnipotent/\@function/;
-               $line =~ s/\@function.*/\@function/;
-               if ($line =~ /\.picmeup\s+(%r[\w]+)/i) {
-                   $self->{value} = sprintf "\t.long\t0x%x,0x90000000",$opcode{$1};
-               } else {
-                   $self->{value} = $line;
-               }
-               $line = "";
-               return $self;
-           }
-
            $dir = $1;
            $ret = $self;
            undef $self->{value};
            $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
            SWITCH: for ($dir) {
-               /\.(text)/
-                           && 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 ALIGN(64) 'CODE'";
-                                   $self->{value} = $v;
+               /\.picmeup/ && do { if ($line =~ /(%r[\w]+)/i) {
+                                       $dir="\t.long";
+                                       $line=sprintf "0x%x,0x90000000",$opcode{$1};
+                                   }
+                                   last;
+                                 };
+               /\.global|\.globl|\.extern/
+                           && do { $globals{$line} = $prefix . $line;
+                                   $line = $globals{$line} if ($prefix);
                                    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;
+                                       $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
                                    } elsif ($type eq "\@abi-omnipotent") {
                                        undef $current_function;
                                        $current_function->{name} = $sym;
+                                       $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
+                                   }
+                                   $line =~ s/\@abi\-omnipotent/\@function/;
+                                   $line =~ s/\@function.*/\@function/;
+                                   last;
+                                 };
+               /\.asciz/   && do { if ($line =~ /^"(.*)"$/) {
+                                       $dir  = ".byte";
+                                       $line = join(",",unpack("C*",$1),0);
+                                   }
+                                   last;
+                                 };
+               /\.rva|\.long|\.quad/
+                           && do { $line =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+                                   $line =~ s/\.L/$decor/g;
+                                   last;
+                                 };
+           }
+
+           if ($gas) {
+               $self->{value} = $dir . "\t" . $line;
+
+               if ($dir =~ /\.extern/) {
+                   $self->{value} = ""; # swallow extern
+               } elsif (!$elf && $dir =~ /\.type/) {
+                   $self->{value} = "";
+                   $self->{value} = ".def\t" . ($globals{$1} or $1) . ";\t" .
+                               (defined($globals{$1})?".scl 2;":".scl 3;") .
+                               "\t.type 32;\t.endef"
+                               if ($win64 && $line =~ /([^,]+),\@function/);
+               } elsif (!$elf && $dir =~ /\.size/) {
+                   $self->{value} = "";
+                   if (defined($current_function)) {
+                       $self->{value} .= "${decor}SEH_end_$current_function->{name}:"
+                               if ($win64 && $current_function->{abi} eq "svr4");
+                       undef $current_function;
+                   }
+               } elsif (!$elf && $dir =~ /\.align/) {
+                   $self->{value} = ".p2align\t" . (log($line)/log(2));
+               } elsif ($dir eq ".section") {
+                   $current_segment=$line;
+                   if (!$elf && $current_segment eq ".init") {
+                       if      ($flavour eq "macosx")  { $self->{value} = ".mod_init_func"; }
+                       elsif   ($flavour eq "mingw64") { $self->{value} = ".section\t.ctors"; }
+                   }
+               } elsif ($dir =~ /\.(text|data)/) {
+                   $current_segment=".$1";
+               }
+               $line = "";
+               return $self;
+           }
+
+           # non-gas case or nasm/masm
+           SWITCH: for ($dir) {
+               /\.text/    && do { my $v=undef;
+                                   if ($nasm) {
+                                       $v="section     .text code align=64\n";
+                                   } else {
+                                       $v="$current_segment\tENDS\n" if ($current_segment);
+                                       $current_segment = ".text\$";
+                                       $v.="$current_segment\tSEGMENT ";
+                                       $v.=$masm>=$masmref ? "ALIGN(64)" : "PAGE";
+                                       $v.=" 'CODE'";
+                                   }
+                                   $self->{value} = $v;
+                                   last;
+                                 };
+               /\.data/    && do { my $v=undef;
+                                   if ($nasm) {
+                                       $v="section     .data data align=8\n";
+                                   } else {
+                                       $v="$current_segment\tENDS\n" if ($current_segment);
+                                       $current_segment = "_DATA";
+                                       $v.="$current_segment\tSEGMENT";
+                                   }
+                                   $self->{value} = $v;
+                                   last;
+                                 };
+               /\.section/ && do { my $v=undef;
+                                   $line =~ s/([^,]*).*/$1/;
+                                   $line = ".CRT\$XCU" if ($line eq ".init");
+                                   if ($nasm) {
+                                       $v="section     $line";
+                                       if ($line=~/\.([px])data/) {
+                                           $v.=" rdata align=";
+                                           $v.=$1 eq "p"? 4 : 8;
+                                       }
+                                   } else {
+                                       $v="$current_segment\tENDS\n" if ($current_segment);
+                                       $v.="$line\tSEGMENT";
+                                       if ($line=~/\.([px])data/) {
+                                           $v.=" READONLY";
+                                           $v.=" ALIGN(".($1 eq "p" ? 4 : 8).")" if ($masm>=$masmref);
+                                       }
                                    }
+                                   $current_segment = $line;
+                                   $self->{value} = $v;
+                                   last;
+                                 };
+               /\.extern/  && do { $self->{value}  = "EXTERN\t".$line;
+                                   $self->{value} .= ":NEAR" if ($masm);
+                                   last;
+                                 };
+               /\.globl|.global/
+                           && do { $self->{value}  = $masm?"PUBLIC":"global";
+                                   $self->{value} .= "\t".$line;
                                    last;
                                  };
                /\.size/    && do { if (defined($current_function)) {
-                                       $self->{value}="$current_function->{name}\tENDP";
+                                       undef $self->{value};
+                                       if ($current_function->{abi} eq "svr4") {
+                                           $self->{value}="${decor}SEH_end_$current_function->{name}:";
+                                           $self->{value}.=":\n" if($masm);
+                                       }
+                                       $self->{value}.="$current_function->{name}\tENDP" if($masm);
                                        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);
+               /\.(value|long|rva|quad)/
+                           && do { my $sz  = substr($1,0,1);
+                                   my @arr = split(',',$line);
                                    my $last = pop(@arr);
-
-                                   $sz =~ tr/bvlq/BWDQ/;
+                                   my $conv = sub  {   my $var=shift;
+                                                       $var=~s/^(0b[0-1]+)/oct($1)/eig;
+                                                       $var=~s/^0x([0-9a-f]+)/0$1h/ig if ($masm);
+                                                       if ($sz eq "D" && ($current_segment=~/.[px]data/ || $dir eq ".rva"))
+                                                       { $var=~s/([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
+                                                       $var;
+                                                   };  
+
+                                   $sz =~ tr/bvlrq/BWDDQ/;
                                    $self->{value} = "\tD$sz\t";
-                                   for (@arr) { $self->{value} .= sprintf"0%Xh,",oct; }
-                                   $self->{value} .= sprintf"0%Xh",oct($last);
+                                   for (@arr) { $self->{value} .= &$conv($_).","; }
+                                   $self->{value} .= &$conv($last);
                                    last;
                                  };
-               /\.picmeup/ && do { $self->{value} = sprintf"\tDD\t 0%Xh,090000000h",$opcode{$line};
+               /\.byte/    && do { my @str=split(",",$line);
+                                   map(s/(0b[0-1]+)/oct($1)/eig,@str);
+                                   map(s/0x([0-9a-f]+)/0$1h/ig,@str) if ($masm);       
+                                   while ($#str>15) {
+                                       $self->{value}.="DB\t"
+                                               .join(",",@str[0..15])."\n";
+                                       foreach (0..15) { shift @str; }
+                                   }
+                                   $self->{value}.="DB\t"
+                                               .join(",",@str) if (@str);
                                    last;
                                  };
            }
@@ -384,6 +612,15 @@ my $current_function;
     }
 }
 
+if ($nasm) {
+    print <<___;
+default        rel
+___
+} elsif ($masm) {
+    print <<___;
+OPTION DOTNAME
+___
+}
 while($line=<>) {
 
     chomp($line);
@@ -394,43 +631,42 @@ while($line=<>) {
 
     undef $label;
     undef $opcode;
-    undef $dst;
-    undef $src;
     undef $sz;
+    undef @args;
 
     if ($label=label->re(\$line))      { print $label->out(); }
 
     if (directive->re(\$line)) {
        printf "%s",directive->out();
-    } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: {
+    } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: while (1) {
+       my $arg;
 
-       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 !~ /^,/);
+       if ($arg=register->re(\$line))  { opcode->size($arg->size()); }
+       elsif ($arg=const->re(\$line))  { }
+       elsif ($arg=ea->re(\$line))     { }
+       elsif ($arg=expr->re(\$line))   { }
+       else                            { last ARGUMENT; }
 
-       $line = substr($line,1); $line =~ s/^\s+//;
+       push @args,$arg;
 
-       if ($dst=register->re(\$line))  { opcode->size($dst->size()); }
-       elsif ($dst=const->re(\$line))  { }
-       elsif ($dst=ea->re(\$line))     { }
+       last ARGUMENT if ($line !~ /^,/);
 
+       $line =~ s/^,\s*//;
        } # 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);
+       if ($#args>=0) {
+           my $insn;
+           if ($gas) {
+               $insn = $opcode->out($#args>=1?$args[$#args]->size():$sz);
            } else {
-               printf "\t%s\t%s,%s",   $opcode->out(),
-                                       $dst->out($sz),$src->out($sz);
+               $insn = $opcode->out();
+               $insn .= $sz if (map($_->out() =~ /xmm|mmx/,@args));
+               @args = reverse(@args);
+               undef $sz if ($nasm && $opcode->mnemonic() eq "lea");
            }
-       } elsif (defined($src)) {
-           printf "\t%s\t%s",$opcode->out(),$src->out($sz);
+           printf "\t%s\t%s",$insn,join(",",map($_->out($sz),@args));
        } else {
            printf "\t%s",$opcode->out();
        }
@@ -439,11 +675,12 @@ while($line=<>) {
     print $line,"\n";
 }
 
-print "\n$current_segment\tENDS\nEND\n" if ($masm);
+print "\n$current_segment\tENDS\n"     if ($current_segment && $masm);
+print "END\n"                          if ($masm);
 
 close STDOUT;
 
-#################################################
+\f#################################################
 # Cross-reference x86_64 ABI "card"
 #
 #              Unix            Win64
@@ -480,7 +717,10 @@ close STDOUT;
 # 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].
+# storage [without allocating a frame]. One can actually argue that
+# one can assume a "red zone" above stack pointer under Win64 as well.
+# Point is that at apparently no occasion Windows kernel would alter
+# the area above user stack pointer in true asynchronous manner...
 #
 # All the above means that if assembler programmer adheres to Unix
 # register and stack layout, but disregards the "red zone" existense,
@@ -504,3 +744,160 @@ close STDOUT;
 #      movq    16(%rsp),%rsi
 # endif
 #      ret
+#
+\f#################################################
+# Win64 SEH, Structured Exception Handling.
+#
+# Unlike on Unix systems(*) lack of Win64 stack unwinding information
+# has undesired side-effect at run-time: if an exception is raised in
+# assembler subroutine such as those in question (basically we're
+# referring to segmentation violations caused by malformed input
+# parameters), the application is briskly terminated without invoking
+# any exception handlers, most notably without generating memory dump
+# or any user notification whatsoever. This poses a problem. It's
+# possible to address it by registering custom language-specific
+# handler that would restore processor context to the state at
+# subroutine entry point and return "exception is not handled, keep
+# unwinding" code. Writing such handler can be a challenge... But it's
+# doable, though requires certain coding convention. Consider following
+# snippet:
+#
+# .type        function,@function
+# function:
+#      movq    %rsp,%rax       # copy rsp to volatile register
+#      pushq   %r15            # save non-volatile registers
+#      pushq   %rbx
+#      pushq   %rbp
+#      movq    %rsp,%r11
+#      subq    %rdi,%r11       # prepare [variable] stack frame
+#      andq    $-64,%r11
+#      movq    %rax,0(%r11)    # check for exceptions
+#      movq    %r11,%rsp       # allocate [variable] stack frame
+#      movq    %rax,0(%rsp)    # save original rsp value
+# magic_point:
+#      ...
+#      movq    0(%rsp),%rcx    # pull original rsp value
+#      movq    -24(%rcx),%rbp  # restore non-volatile registers
+#      movq    -16(%rcx),%rbx
+#      movq    -8(%rcx),%r15
+#      movq    %rcx,%rsp       # restore original rsp
+#      ret
+# .size function,.-function
+#
+# The key is that up to magic_point copy of original rsp value remains
+# in chosen volatile register and no non-volatile register, except for
+# rsp, is modified. While past magic_point rsp remains constant till
+# the very end of the function. In this case custom language-specific
+# exception handler would look like this:
+#
+# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
+#              CONTEXT *context,DISPATCHER_CONTEXT *disp)
+# {    ULONG64 *rsp = (ULONG64 *)context->Rax;
+#      if (context->Rip >= magic_point)
+#      {   rsp = ((ULONG64 **)context->Rsp)[0];
+#          context->Rbp = rsp[-3];
+#          context->Rbx = rsp[-2];
+#          context->R15 = rsp[-1];
+#      }
+#      context->Rsp = (ULONG64)rsp;
+#      context->Rdi = rsp[1];
+#      context->Rsi = rsp[2];
+#
+#      memcpy (disp->ContextRecord,context,sizeof(CONTEXT));
+#      RtlVirtualUnwind(UNW_FLAG_NHANDLER,disp->ImageBase,
+#              dips->ControlPc,disp->FunctionEntry,disp->ContextRecord,
+#              &disp->HandlerData,&disp->EstablisherFrame,NULL);
+#      return ExceptionContinueSearch;
+# }
+#
+# It's appropriate to implement this handler in assembler, directly in
+# function's module. In order to do that one has to know members'
+# offsets in CONTEXT and DISPATCHER_CONTEXT structures and some constant
+# values. Here they are:
+#
+#      CONTEXT.Rax                             120
+#      CONTEXT.Rcx                             128
+#      CONTEXT.Rdx                             136
+#      CONTEXT.Rbx                             144
+#      CONTEXT.Rsp                             152
+#      CONTEXT.Rbp                             160
+#      CONTEXT.Rsi                             168
+#      CONTEXT.Rdi                             176
+#      CONTEXT.R8                              184
+#      CONTEXT.R9                              192
+#      CONTEXT.R10                             200
+#      CONTEXT.R11                             208
+#      CONTEXT.R12                             216
+#      CONTEXT.R13                             224
+#      CONTEXT.R14                             232
+#      CONTEXT.R15                             240
+#      CONTEXT.Rip                             248
+#      sizeof(CONTEXT)                         1232
+#      DISPATCHER_CONTEXT.ControlPc            0
+#      DISPATCHER_CONTEXT.ImageBase            8
+#      DISPATCHER_CONTEXT.FunctionEntry        16
+#      DISPATCHER_CONTEXT.EstablisherFrame     24
+#      DISPATCHER_CONTEXT.TargetIp             32
+#      DISPATCHER_CONTEXT.ContextRecord        40
+#      DISPATCHER_CONTEXT.LanguageHandler      48
+#      DISPATCHER_CONTEXT.HandlerData          56
+#      UNW_FLAG_NHANDLER                       0
+#      ExceptionContinueSearch                 1
+#
+# In order to tie the handler to the function one has to compose
+# couple of structures: one for .xdata segment and one for .pdata.
+#
+# UNWIND_INFO structure for .xdata segment would be
+#
+# function_unwind_info:
+#      .byte   9,0,0,0
+#      .rva    handler
+#
+# This structure designates exception handler for a function with
+# zero-length prologue, no stack frame or frame register.
+#
+# To facilitate composing of .pdata structures, auto-generated "gear"
+# prologue copies rsp value to rax and denotes next instruction with
+# .LSEH_begin_{function_name} label. This essentially defines the SEH
+# styling rule mentioned in the beginning. Position of this label is
+# chosen in such manner that possible exceptions raised in the "gear"
+# prologue would be accounted to caller and unwound from latter's frame.
+# End of function is marked with respective .LSEH_end_{function_name}
+# label. To summarize, .pdata segment would contain
+#
+#      .rva    .LSEH_begin_function
+#      .rva    .LSEH_end_function
+#      .rva    function_unwind_info
+#
+# Reference to functon_unwind_info from .xdata segment is the anchor.
+# In case you wonder why references are 32-bit .rvas and not 64-bit
+# .quads. References put into these two segments are required to be
+# *relative* to the base address of the current binary module, a.k.a.
+# image base. No Win64 module, be it .exe or .dll, can be larger than
+# 2GB and thus such relative references can be and are accommodated in
+# 32 bits.
+#
+# Having reviewed the example function code, one can argue that "movq
+# %rsp,%rax" above is redundant. It is not! Keep in mind that on Unix
+# rax would contain an undefined value. If this "offends" you, use
+# another register and refrain from modifying rax till magic_point is
+# reached, i.e. as if it was a non-volatile register. If more registers
+# are required prior [variable] frame setup is completed, note that
+# nobody says that you can have only one "magic point." You can
+# "liberate" non-volatile registers by denoting last stack off-load
+# instruction and reflecting it in finer grade unwind logic in handler.
+# After all, isn't it why it's called *language-specific* handler...
+#
+# Attentive reader can notice that exceptions would be mishandled in
+# auto-generated "gear" epilogue. Well, exception effectively can't
+# occur there, because if memory area used by it was subject to
+# segmentation violation, then it would be raised upon call to the
+# function (and as already mentioned be accounted to caller, which is
+# not a problem). If you're still not comfortable, then define tail
+# "magic point" just prior ret instruction and have handler treat it...
+#
+# (*)  Note that we're talking about run-time, not debug-time. Lack of
+#      unwind information makes debugging hard on both Windows and
+#      Unix. "Unlike" referes to the fact that on Unix signal handler
+#      will always be invoked, core dumped and appropriate exit code
+#      returned to parent (for user notification).