Upgrade chrome's OpenSSL to same version Android ships with.

openssl/crypto/perlasm/x86_64-xlate.pl

 #!/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
 # 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].
+# 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.
 # 3. Functions tagged with ".type name,@function" get crafted with
 #    unified Win64 prologue and epilogue automatically. If you want
 #    to take care of ABI differences yourself, tag functions as
 #    ".type name,@abi-omnipotent" instead.
 # 4. To optimize the Win64 prologue 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 >6 cases can't be addressed with unified prologue.
 # 5. Name local labels as .L*, do *not* use dynamic labels such as 1:
 #    (sorry about latter).
 # 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;
+#
+# 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.
+# a. If function accepts more than 4 arguments *and* >4th argument
+#    is declared as non 64-bit value, do clear its upper part.
+
+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 $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 $masm=$masmref if ($output =~ /\.asm/);
-if ($masm && `ml64 2>&1` =~ m/Version ([0-9]+)\.([0-9]+)(\.([0-9]+))?/)
-{   $masm=$1 + $2*2**-16 + $4*2**-32;   }
+my $masm=0;
+my $PTR=" PTR";
+
+my $nasmref=2.03;
+my $nasm=0;
+
+if    ($flavour eq "mingw64")   { $gas=1; $elf=0; $win64=1;
+                                  $prefix=`echo __USER_LABEL_PREFIX__ | $ENV{CC} -E -P -`;
+                                  chomp($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 {
         my      $self = shift;  # single instance in enough...
         local   *line = shift;
         undef   $ret;
 
         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...
                 $self->{op} = $1;
                 $self->{sz} = "b";
-            } elsif ($self->{op} =~ /call/) {
-                $self->{sz} = ""
+            } elsif ($self->{op} =~ /call|jmp/) {
+                $self->{sz} = "";
+            } elsif ($self->{op} =~ /^p/ && $' !~ /^(ush|op)/) { # SSEn
+                $self->{sz} = "";
             } elsif ($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 ($gas) {
             if ($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 {
             $self->{op} =~ s/^movz/movzx/;
             if ($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} = "\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 {
         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;
 
-        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/(?<![\w\$\.])(0x?[0-9a-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};
         }
     }
 }
 { 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(/,/,$2);
+        # optional * ---vvv--- appears in indirect jmp/call
+        if ($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}));
         }
         $ret;
     }
     sub size {}
     sub out {
         my $self = shift;
         my $sz = shift;
 
+        $self->{label} =~ s/([_a-z][_a-z0-9]*)/$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 (!$masm) {
+        if ($gas) {
             # Solaris /usr/ccs/bin/as can't handle multiplications
-            # in $self->{label}
+            # in $self->{label}, new gas requires sign extension...
             use integer;
-            $self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
+            $self->{label} =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
             $self->{label} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
             $self->{label} =~ s/([0-9]+)/$1<<32>>32/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} =~ s/(?<![\w\$\.])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 PTR %s",$szmap{$sz},$self->{label};
+                sprintf "%s[%s]",$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};
             }
         }
     }
 }
 { package register;     # pick up registers, which start with %.
     sub re {
         my      $class = shift; # muliple instances...
         my      $self = {};
         local   *line = shift;
         undef   $ret;
 
-        if ($line =~ /^%(\w+)/) {
+        # optional * ---vvv--- appears in indirect jmp/call
+        if ($line =~ /^(\*?)%(\w+)/) {
             bless $self,$class;
-            $self->{value} = $1;
+            $self->{asterisk} = $1;
+            $self->{value} = $2;
             $ret = $self;
             $line = substr($line,@+[0]); $line =~ s/^\s+//;
         }
         $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};
+        if ($gas)       { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
+        else            { $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 ($line =~ /(^[\.\w]+\:)/) {
+        if ($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}");
         }
     }
 }
 { 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);
+            $self->{value} =~ s/\@PLT// if (!$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 .
     sub re {
         my      $self = shift;  # single instance is enough...
         local   *line = shift;
         undef   $ret;
         my      $dir;
         my      %opcode =       # lea 2f-1f(%rip),%dst; 1: nop; 2:
                 (       "%rax"=>0x01058d48,     "%rcx"=>0x010d8d48,
                         "%rdx"=>0x01158d48,     "%rbx"=>0x011d8d48,
                         "%rsp"=>0x01258d48,     "%rbp"=>0x012d8d48,
                         "%rsi"=>0x01358d48,     "%rdi"=>0x013d8d48,
                         "%r8" =>0x01058d4c,     "%r9" =>0x010d8d4c,
                         "%r10"=>0x01158d4c,     "%r11"=>0x011d8d4c,
                         "%r12"=>0x01258d4c,     "%r13"=>0x012d8d4c,
                         "%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{$1};
-                } elsif ($line =~ /\.asciz\s+"(.*)"$/) {
-                    $self->{value} = ".byte\t".join(",",unpack("C*",$1),0);
-                } elsif ($line =~ /\.extern/) {
-                    $self->{value} = ""; # swallow extern
-                } 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 ";
-                                    $v.=$masm>=$masmref ? "ALIGN(64)" : "PAGE";
-                                    $v.=" 'CODE'";
-                                    $self->{value} = $v;
+                /\.picmeup/ && do { if ($line =~ /(%r[\w]+)/i) {
+                                        $dir="\t.long";
+                                        $line=sprintf "0x%x,0x90000000",$opcode{$1};
+                                    }
                                     last;
                                   };
-                /\.extern/  && do { $self->{value} = "EXTRN\t".$line.":BYTE"; last;  };
-                /\.globl/   && do { $self->{value} = "PUBLIC\t".$line; last; };
+                /\.global|\.globl|\.extern/
+                            && do { $globals{$line} = $prefix . $line;
+                                    $line = $globals{$line} if ($prefix);
+                                    last;
+                                  };
                 /\.type/    && do { ($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.=$1 eq "p"? 4 : 8;
+                                        } elsif ($line=~/\.CRT\$/i) {
+                                            $v.=" rdata align=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>=$masmref);
+                                        } elsif ($line=~/\.CRT\$/i) {
+                                            $v.=" READONLY DWORD";
+                                        }
+                                    }
+                                    $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($1,0,1);
+                                    my @arr = split(/,\s*/,$line);
                                     my $last = pop(@arr);
                                     my $conv = sub  {   my $var=shift;
-                                                        if ($var=~s/0x([0-9a-f]+)/0$1h/i) { $var; }
-                                                        else { sprintf"0%Xh",$var; }
+                                                        $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/bvlq/BWDQ/;
+                                    $sz =~ tr/bvlrq/BWDDQ/;
                                     $self->{value} = "\tD$sz\t";
                                     for (@arr) { $self->{value} .= &$conv($_).","; }
                                     $self->{value} .= &$conv($last);
                                     last;
                                   };
-                /\.picmeup/ && do { $self->{value} = sprintf"\tDD\t 0%Xh,090000000h",$opcode{$line};
-                                    last;
-                                  };
-                /\.asciz/   && do { if ($line =~ /^"(.*)"$/) {
-                                        my @str=unpack("C*",$1);
-                                        push @str,0;
-                                        while ($#str>15) {
-                                            $self->{value}.="DB\t"
+                /\.byte/    && do { my @str=split(/,\s*/,$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"
+                                        foreach (0..15) { shift @str; }
+                                    }
+                                    $self->{value}.="DB\t"
                                                 .join(",",@str) if (@str);
-                                    }
                                     last;
                                   };
             }
             $line = "";
         }
 
         $ret;
     }
     sub out {
         my $self = shift;
         $self->{value};
     }
 }
 
+if ($nasm) {
+    print <<___;
+default rel
+___
+} elsif ($masm) {
+    print <<___;
+OPTION  DOTNAME
+___
+}
 while($line=<>) {
 
     chomp($line);
 
     $line =~ s|[#!].*$||;       # get rid of asm-style comments...
     $line =~ s|/\*.*\*/||;      # ... and C-style comments...
     $line =~ s|^\s+||;          # ... and skip white spaces in beginning
 
     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 ($src=expr->re(\$line))   { }
+        if ($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; }
+
+        push @args,$arg;
 
         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))     { }
-
+        $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() =~ /x?mm/,@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();
         }
     }
 
     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;
 
-#################################################
+#################################################
 # Cross-reference x86_64 ABI "card"
 #
 #               Unix            Win64
 # %rax          *               *
 # %rbx          -               -
 # %rcx          #4              #1
 # %rdx          #3              #2
 # %rsi          #2              -
 # %rdi          #1              -
 # %rbp          -               -
@@ skipping 43 matching lines @@
 #       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
+#
+#################################################
+# 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
+#       CONTEXT.Xmm6                            512
+#       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).