zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libssl/openssl-1.1.1o/crypto/perlasm/x86_64-xlate.pl b/ap/lib/libssl/openssl-1.1.1o/crypto/perlasm/x86_64-xlate.pl
new file mode 100755
index 0000000..59af6df
--- /dev/null
+++ b/ap/lib/libssl/openssl-1.1.1o/crypto/perlasm/x86_64-xlate.pl
@@ -0,0 +1,1447 @@
+#! /usr/bin/env perl
+# Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License"). You may not use
+# this file except in compliance with the License. You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+
+# 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;
+#
+# Dual-ABI styling rules.
+#
+# 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. 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.
+#
+# 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.
+
+
+use strict;
+
+my $flavour = shift;
+my $output = shift;
+if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
+
+open STDOUT,">$output" || die "can't open $output: $!"
+ if (defined($output));
+
+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=`echo __USER_LABEL_PREFIX__ | $ENV{CC} -E -P -`;
+ $prefix =~ s|\R$||; # Better chomp
+ }
+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 $current_function;
+my %globals;
+
+{ package opcode; # pick up opcodes
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ /^([a-z][a-z0-9]*)/i) {
+ bless $self,$class;
+ $self->{op} = $1;
+ $ret = $self;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+
+ undef $self->{sz};
+ if ($self->{op} =~ /^(movz)x?([bw]).*/) { # movz is pain...
+ $self->{op} = $1;
+ $self->{sz} = $2;
+ } elsif ($self->{op} =~ /call|jmp/) {
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /^p/ && $' !~ /^(ush|op|insrw)/) { # SSEn
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /^[vk]/) { # VEX or k* such as kmov
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /mov[dq]/ && $$line =~ /%xmm/) {
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /([a-z]{3,})([qlwb])$/) {
+ $self->{op} = $1;
+ $self->{sz} = $2;
+ }
+ }
+ $ret;
+ }
+ sub size {
+ my ($self, $sz) = @_;
+ $self->{sz} = $sz if (defined($sz) && !defined($self->{sz}));
+ $self->{sz};
+ }
+ sub out {
+ my $self = shift;
+ if ($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") {
+ 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") {
+ $self->{op} = "";
+ if ($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, $op) = @_;
+ $self->{op}=$op if (defined($op));
+ $self->{op};
+ }
+}
+{ package const; # pick up constants, which start with $
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ /^\$([^,]+)/) {
+ bless $self, $class;
+ $self->{value} = $1;
+ $ret = $self;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+ }
+ $ret;
+ }
+ sub out {
+ my $self = shift;
+
+ $self->{value} =~ s/\b(0b[0-1]+)/oct($1)/eig;
+ if ($gas) {
+ # Solaris /usr/ccs/bin/as can't handle multiplications
+ # in $self->{value}
+ my $value = $self->{value};
+ no warnings; # oct might complain about overflow, ignore here...
+ $value =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
+ if ($value =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg) {
+ $self->{value} = $value;
+ }
+ sprintf "\$%s",$self->{value};
+ } else {
+ my $value = $self->{value};
+ $value =~ s/0x([0-9a-f]+)/0$1h/ig if ($masm);
+ sprintf "%s",$value;
+ }
+ }
+}
+{ package ea; # pick up effective addresses: expr(%reg,%reg,scale)
+
+ my %szmap = ( b=>"BYTE$PTR", w=>"WORD$PTR",
+ l=>"DWORD$PTR", d=>"DWORD$PTR",
+ q=>"QWORD$PTR", o=>"OWORD$PTR",
+ x=>"XMMWORD$PTR", y=>"YMMWORD$PTR",
+ z=>"ZMMWORD$PTR" ) if (!$gas);
+
+ sub re {
+ my ($class, $line, $opcode) = @_;
+ my $self = {};
+ my $ret;
+
+ # optional * ----vvv--- appears in indirect jmp/call
+ if ($$line =~ /^(\*?)([^\(,]*)\(([%\w,]+)\)((?:{[^}]+})*)/) {
+ bless $self, $class;
+ $self->{asterisk} = $1;
+ $self->{label} = $2;
+ ($self->{base},$self->{index},$self->{scale})=split(/,/,$3);
+ $self->{scale} = 1 if (!defined($self->{scale}));
+ $self->{opmask} = $4;
+ $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}));
+ $self->{opcode} = $opcode;
+ }
+ $ret;
+ }
+ sub size {}
+ sub out {
+ my ($self, $sz) = @_;
+
+ $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/;
+
+ # Solaris /usr/ccs/bin/as can't handle multiplications
+ # in $self->{label}...
+ use integer;
+ $self->{label} =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
+ $self->{label} =~ s/\b([0-9]+\s*[\*\/\%]\s*[0-9]+)\b/eval($1)/eg;
+
+ # Some assemblers insist on signed presentation of 32-bit
+ # offsets, but sign extension is a tricky business in perl...
+ if ((1<<31)<<1) {
+ $self->{label} =~ s/\b([0-9]+)\b/$1<<32>>32/eg;
+ } else {
+ $self->{label} =~ s/\b([0-9]+)\b/$1>>0/eg;
+ }
+
+ # if base register is %rbp or %r13, see if it's possible to
+ # flip base and index registers [for better performance]
+ if (!$self->{label} && $self->{index} && $self->{scale}==1 &&
+ $self->{base} =~ /(rbp|r13)/) {
+ $self->{base} = $self->{index}; $self->{index} = $1;
+ }
+
+ if ($gas) {
+ $self->{label} =~ s/^___imp_/__imp__/ if ($flavour eq "mingw64");
+
+ if (defined($self->{index})) {
+ sprintf "%s%s(%s,%%%s,%d)%s",
+ $self->{asterisk},$self->{label},
+ $self->{base}?"%$self->{base}":"",
+ $self->{index},$self->{scale},
+ $self->{opmask};
+ } else {
+ sprintf "%s%s(%%%s)%s", $self->{asterisk},$self->{label},
+ $self->{base},$self->{opmask};
+ }
+ } else {
+ $self->{label} =~ s/\./\$/g;
+ $self->{label} =~ s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/ig;
+ $self->{label} = "($self->{label})" if ($self->{label} =~ /[\*\+\-\/]/);
+
+ my $mnemonic = $self->{opcode}->mnemonic();
+ ($self->{asterisk}) && ($sz="q") ||
+ ($mnemonic =~ /^v?mov([qd])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^v?pinsr([qdwb])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^vpbroadcast([qdwb])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^v(?!perm)[a-z]+[fi]128$/) && ($sz="x");
+
+ $self->{opmask} =~ s/%(k[0-7])/$1/;
+
+ if (defined($self->{index})) {
+ sprintf "%s[%s%s*%d%s]%s",$szmap{$sz},
+ $self->{label}?"$self->{label}+":"",
+ $self->{index},$self->{scale},
+ $self->{base}?"+$self->{base}":"",
+ $self->{opmask};
+ } elsif ($self->{base} eq "rip") {
+ sprintf "%s[%s]",$szmap{$sz},$self->{label};
+ } else {
+ sprintf "%s[%s%s]%s", $szmap{$sz},
+ $self->{label}?"$self->{label}+":"",
+ $self->{base},$self->{opmask};
+ }
+ }
+ }
+}
+{ package register; # pick up registers, which start with %.
+ sub re {
+ my ($class, $line, $opcode) = @_;
+ my $self = {};
+ my $ret;
+
+ # optional * ----vvv--- appears in indirect jmp/call
+ if ($$line =~ /^(\*?)%(\w+)((?:{[^}]+})*)/) {
+ bless $self,$class;
+ $self->{asterisk} = $1;
+ $self->{value} = $2;
+ $self->{opmask} = $3;
+ $opcode->size($self->size());
+ $ret = $self;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+ }
+ $ret;
+ }
+ sub size {
+ my $self = shift;
+ my $ret;
+
+ if ($self->{value} =~ /^r[\d]+b$/i) { $ret="b"; }
+ elsif ($self->{value} =~ /^r[\d]+w$/i) { $ret="w"; }
+ elsif ($self->{value} =~ /^r[\d]+d$/i) { $ret="l"; }
+ elsif ($self->{value} =~ /^r[\w]+$/i) { $ret="q"; }
+ elsif ($self->{value} =~ /^[a-d][hl]$/i){ $ret="b"; }
+ elsif ($self->{value} =~ /^[\w]{2}l$/i) { $ret="b"; }
+ elsif ($self->{value} =~ /^[\w]{2}$/i) { $ret="w"; }
+ elsif ($self->{value} =~ /^e[a-z]{2}$/i){ $ret="l"; }
+
+ $ret;
+ }
+ sub out {
+ my $self = shift;
+ if ($gas) { sprintf "%s%%%s%s", $self->{asterisk},
+ $self->{value},
+ $self->{opmask}; }
+ else { $self->{opmask} =~ s/%(k[0-7])/$1/;
+ $self->{value}.$self->{opmask}; }
+ }
+}
+{ package label; # pick up labels, which end with :
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ /(^[\.\w]+)\:/) {
+ bless $self,$class;
+ $self->{value} = $1;
+ $ret = $self;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+
+ $self->{value} =~ s/^\.L/$decor/;
+ }
+ $ret;
+ }
+ sub out {
+ my $self = shift;
+
+ if ($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}") {
+ # Make all labels in masm global.
+ $self->{value} .= ":" if ($masm);
+ $self->{value} . ":";
+ } elsif ($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);
+ $func .= "\n";
+ } else {
+ "$current_function->{name}".
+ ($nasm ? ":" : "\tPROC $current_function->{scope}");
+ }
+ }
+}
+{ package expr; # pick up expressions
+ sub re {
+ my ($class, $line, $opcode) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ /(^[^,]+)/) {
+ bless $self,$class;
+ $self->{value} = $1;
+ $ret = $self;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+
+ $self->{value} =~ s/\@PLT// if (!$elf);
+ $self->{value} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+ $self->{value} =~ s/\.L/$decor/g;
+ $self->{opcode} = $opcode;
+ }
+ $ret;
+ }
+ sub out {
+ my $self = shift;
+ if ($nasm && $self->{opcode}->mnemonic()=~m/^j(?![re]cxz)/) {
+ "NEAR ".$self->{value};
+ } else {
+ $self->{value};
+ }
+ }
+}
+{ package cfi_directive;
+ # CFI directives annotate instructions that are significant for
+ # stack unwinding procedure compliant with DWARF specification,
+ # see http://dwarfstd.org/. Besides naturally expected for this
+ # script platform-specific filtering function, this module adds
+ # three auxiliary synthetic directives not recognized by [GNU]
+ # assembler:
+ #
+ # - .cfi_push to annotate push instructions in prologue, which
+ # translates to .cfi_adjust_cfa_offset (if needed) and
+ # .cfi_offset;
+ # - .cfi_pop to annotate pop instructions in epilogue, which
+ # translates to .cfi_adjust_cfa_offset (if needed) and
+ # .cfi_restore;
+ # - [and most notably] .cfi_cfa_expression which encodes
+ # DW_CFA_def_cfa_expression and passes it to .cfi_escape as
+ # byte vector;
+ #
+ # CFA expressions were introduced in DWARF specification version
+ # 3 and describe how to deduce CFA, Canonical Frame Address. This
+ # becomes handy if your stack frame is variable and you can't
+ # spare register for [previous] frame pointer. Suggested directive
+ # syntax is made-up mix of DWARF operator suffixes [subset of]
+ # and references to registers with optional bias. Following example
+ # describes offloaded *original* stack pointer at specific offset
+ # from *current* stack pointer:
+ #
+ # .cfi_cfa_expression %rsp+40,deref,+8
+ #
+ # Final +8 has everything to do with the fact that CFA is defined
+ # as reference to top of caller's stack, and on x86_64 call to
+ # subroutine pushes 8-byte return address. In other words original
+ # stack pointer upon entry to a subroutine is 8 bytes off from CFA.
+
+ # Below constants are taken from "DWARF Expressions" section of the
+ # DWARF specification, section is numbered 7.7 in versions 3 and 4.
+ my %DW_OP_simple = ( # no-arg operators, mapped directly
+ deref => 0x06, dup => 0x12,
+ drop => 0x13, over => 0x14,
+ pick => 0x15, swap => 0x16,
+ rot => 0x17, xderef => 0x18,
+
+ abs => 0x19, and => 0x1a,
+ div => 0x1b, minus => 0x1c,
+ mod => 0x1d, mul => 0x1e,
+ neg => 0x1f, not => 0x20,
+ or => 0x21, plus => 0x22,
+ shl => 0x24, shr => 0x25,
+ shra => 0x26, xor => 0x27,
+ );
+
+ my %DW_OP_complex = ( # used in specific subroutines
+ constu => 0x10, # uleb128
+ consts => 0x11, # sleb128
+ plus_uconst => 0x23, # uleb128
+ lit0 => 0x30, # add 0-31 to opcode
+ reg0 => 0x50, # add 0-31 to opcode
+ breg0 => 0x70, # add 0-31 to opcole, sleb128
+ regx => 0x90, # uleb28
+ fbreg => 0x91, # sleb128
+ bregx => 0x92, # uleb128, sleb128
+ piece => 0x93, # uleb128
+ );
+
+ # Following constants are defined in x86_64 ABI supplement, for
+ # example available at https://www.uclibc.org/docs/psABI-x86_64.pdf,
+ # see section 3.7 "Stack Unwind Algorithm".
+ my %DW_reg_idx = (
+ "%rax"=>0, "%rdx"=>1, "%rcx"=>2, "%rbx"=>3,
+ "%rsi"=>4, "%rdi"=>5, "%rbp"=>6, "%rsp"=>7,
+ "%r8" =>8, "%r9" =>9, "%r10"=>10, "%r11"=>11,
+ "%r12"=>12, "%r13"=>13, "%r14"=>14, "%r15"=>15
+ );
+
+ my ($cfa_reg, $cfa_rsp);
+ my @cfa_stack;
+
+ # [us]leb128 format is variable-length integer representation base
+ # 2^128, with most significant bit of each byte being 0 denoting
+ # *last* most significant digit. See "Variable Length Data" in the
+ # DWARF specification, numbered 7.6 at least in versions 3 and 4.
+ sub sleb128 {
+ use integer; # get right shift extend sign
+
+ my $val = shift;
+ my $sign = ($val < 0) ? -1 : 0;
+ my @ret = ();
+
+ while(1) {
+ push @ret, $val&0x7f;
+
+ # see if remaining bits are same and equal to most
+ # significant bit of the current digit, if so, it's
+ # last digit...
+ last if (($val>>6) == $sign);
+
+ @ret[-1] |= 0x80;
+ $val >>= 7;
+ }
+
+ return @ret;
+ }
+ sub uleb128 {
+ my $val = shift;
+ my @ret = ();
+
+ while(1) {
+ push @ret, $val&0x7f;
+
+ # see if it's last significant digit...
+ last if (($val >>= 7) == 0);
+
+ @ret[-1] |= 0x80;
+ }
+
+ return @ret;
+ }
+ sub const {
+ my $val = shift;
+
+ if ($val >= 0 && $val < 32) {
+ return ($DW_OP_complex{lit0}+$val);
+ }
+ return ($DW_OP_complex{consts}, sleb128($val));
+ }
+ sub reg {
+ my $val = shift;
+
+ return if ($val !~ m/^(%r\w+)(?:([\+\-])((?:0x)?[0-9a-f]+))?/);
+
+ my $reg = $DW_reg_idx{$1};
+ my $off = eval ("0 $2 $3");
+
+ return (($DW_OP_complex{breg0} + $reg), sleb128($off));
+ # Yes, we use DW_OP_bregX+0 to push register value and not
+ # DW_OP_regX, because latter would require even DW_OP_piece,
+ # which would be a waste under the circumstances. If you have
+ # to use DWP_OP_reg, use "regx:N"...
+ }
+ sub cfa_expression {
+ my $line = shift;
+ my @ret;
+
+ foreach my $token (split(/,\s*/,$line)) {
+ if ($token =~ /^%r/) {
+ push @ret,reg($token);
+ } elsif ($token =~ /((?:0x)?[0-9a-f]+)\((%r\w+)\)/) {
+ push @ret,reg("$2+$1");
+ } elsif ($token =~ /(\w+):(\-?(?:0x)?[0-9a-f]+)(U?)/i) {
+ my $i = 1*eval($2);
+ push @ret,$DW_OP_complex{$1}, ($3 ? uleb128($i) : sleb128($i));
+ } elsif (my $i = 1*eval($token) or $token eq "0") {
+ if ($token =~ /^\+/) {
+ push @ret,$DW_OP_complex{plus_uconst},uleb128($i);
+ } else {
+ push @ret,const($i);
+ }
+ } else {
+ push @ret,$DW_OP_simple{$token};
+ }
+ }
+
+ # Finally we return DW_CFA_def_cfa_expression, 15, followed by
+ # length of the expression and of course the expression itself.
+ return (15,scalar(@ret),@ret);
+ }
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ s/^\s*\.cfi_(\w+)\s*//) {
+ bless $self,$class;
+ $ret = $self;
+ undef $self->{value};
+ my $dir = $1;
+
+ SWITCH: for ($dir) {
+ # What is $cfa_rsp? Effectively it's difference between %rsp
+ # value and current CFA, Canonical Frame Address, which is
+ # why it starts with -8. Recall that CFA is top of caller's
+ # stack...
+ /startproc/ && do { ($cfa_reg, $cfa_rsp) = ("%rsp", -8); last; };
+ /endproc/ && do { ($cfa_reg, $cfa_rsp) = ("%rsp", 0);
+ # .cfi_remember_state directives that are not
+ # matched with .cfi_restore_state are
+ # unnecessary.
+ die "unpaired .cfi_remember_state" if (@cfa_stack);
+ last;
+ };
+ /def_cfa_register/
+ && do { $cfa_reg = $$line; last; };
+ /def_cfa_offset/
+ && do { $cfa_rsp = -1*eval($$line) if ($cfa_reg eq "%rsp");
+ last;
+ };
+ /adjust_cfa_offset/
+ && do { $cfa_rsp -= 1*eval($$line) if ($cfa_reg eq "%rsp");
+ last;
+ };
+ /def_cfa/ && do { if ($$line =~ /(%r\w+)\s*,\s*(.+)/) {
+ $cfa_reg = $1;
+ $cfa_rsp = -1*eval($2) if ($cfa_reg eq "%rsp");
+ }
+ last;
+ };
+ /push/ && do { $dir = undef;
+ $cfa_rsp -= 8;
+ if ($cfa_reg eq "%rsp") {
+ $self->{value} = ".cfi_adjust_cfa_offset\t8\n";
+ }
+ $self->{value} .= ".cfi_offset\t$$line,$cfa_rsp";
+ last;
+ };
+ /pop/ && do { $dir = undef;
+ $cfa_rsp += 8;
+ if ($cfa_reg eq "%rsp") {
+ $self->{value} = ".cfi_adjust_cfa_offset\t-8\n";
+ }
+ $self->{value} .= ".cfi_restore\t$$line";
+ last;
+ };
+ /cfa_expression/
+ && do { $dir = undef;
+ $self->{value} = ".cfi_escape\t" .
+ join(",", map(sprintf("0x%02x", $_),
+ cfa_expression($$line)));
+ last;
+ };
+ /remember_state/
+ && do { push @cfa_stack, [$cfa_reg, $cfa_rsp];
+ last;
+ };
+ /restore_state/
+ && do { ($cfa_reg, $cfa_rsp) = @{pop @cfa_stack};
+ last;
+ };
+ }
+
+ $self->{value} = ".cfi_$dir\t$$line" if ($dir);
+
+ $$line = "";
+ }
+
+ return $ret;
+ }
+ sub out {
+ my $self = shift;
+ return ($elf ? $self->{value} : undef);
+ }
+}
+{ package directive; # pick up directives, which start with .
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+ my $dir;
+
+ # chain-call to cfi_directive
+ $ret = cfi_directive->re($line) and return $ret;
+
+ if ($$line =~ /^\s*(\.\w+)/) {
+ bless $self,$class;
+ $dir = $1;
+ $ret = $self;
+ undef $self->{value};
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
+
+ SWITCH: for ($dir) {
+ /\.global|\.globl|\.extern/
+ && do { $globals{$$line} = $prefix . $$line;
+ $$line = $globals{$$line} if ($prefix);
+ last;
+ };
+ /\.type/ && do { my ($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=$$line;
+ if (!$elf && $current_segment eq ".init") {
+ if ($flavour eq "macosx") { $self->{value} = ".mod_init_func"; }
+ elsif ($flavour eq "mingw64") { $self->{value} = ".section\t.ctors"; }
+ }
+ } elsif ($dir =~ /\.(text|data)/) {
+ $current_segment=".$1";
+ } elsif ($dir =~ /\.hidden/) {
+ if ($flavour eq "macosx") { $self->{value} = ".private_extern\t$prefix$$line"; }
+ elsif ($flavour eq "mingw64") { $self->{value} = ""; }
+ } elsif ($dir =~ /\.comm/) {
+ $self->{value} = "$dir\t$prefix$$line";
+ $self->{value} =~ s|,([0-9]+),([0-9]+)$|",$1,".log($2)/log(2)|e if ($flavour eq "macosx");
+ }
+ $$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(256)" : "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 ($$line=~/\.CRT\$/i) {
+ $v.=" READONLY ";
+ $v.=$masm>=$masmref ? "ALIGN(8)" : "DWORD";
+ }
+ }
+ $current_segment = $$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)) {
+ 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 && $current_function->{name});
+ undef $current_function;
+ }
+ last;
+ };
+ /\.align/ && do { my $max = ($masm && $masm>=$masmref) ? 256 : 4096;
+ $self->{value} = "ALIGN\t".($$line>$max?$max:$$line);
+ last;
+ };
+ /\.(value|long|rva|quad)/
+ && do { my $sz = substr($1,0,1);
+ my @arr = split(/,\s*/,$$line);
+ my $last = pop(@arr);
+ my $conv = sub { my $var=shift;
+ $var=~s/^(0b[0-1]+)/oct($1)/eig;
+ $var=~s/^0x([0-9a-f]+)/0$1h/ig if ($masm);
+ if ($sz eq "D" && ($current_segment=~/.[px]data/ || $dir eq ".rva"))
+ { $var=~s/^([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
+ $var;
+ };
+
+ $sz =~ tr/bvlrq/BWDDQ/;
+ $self->{value} = "\tD$sz\t";
+ for (@arr) { $self->{value} .= &$conv($_).","; }
+ $self->{value} .= &$conv($last);
+ last;
+ };
+ /\.byte/ && do { my @str=split(/,\s*/,$$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"
+ .join(",",@str) if (@str);
+ last;
+ };
+ /\.comm/ && do { my @str=split(/,\s*/,$$line);
+ my $v=undef;
+ if ($nasm) {
+ $v.="common $prefix@str[0] @str[1]";
+ } else {
+ $v="$current_segment\tENDS\n" if ($current_segment);
+ $current_segment = "_DATA";
+ $v.="$current_segment\tSEGMENT\n";
+ $v.="COMM @str[0]:DWORD:".@str[1]/4;
+ }
+ $self->{value} = $v;
+ last;
+ };
+ }
+ $$line = "";
+ }
+
+ $ret;
+ }
+ sub out {
+ my $self = shift;
+ $self->{value};
+ }
+}
+
+# Upon initial x86_64 introduction SSE>2 extensions were not introduced
+# yet. In order not to be bothered by tracing exact assembler versions,
+# but at the same time to provide a bare security minimum of AES-NI, we
+# hard-code some instructions. Extensions past AES-NI on the other hand
+# are traced by examining assembler version in individual perlasm
+# modules...
+
+my %regrm = ( "%eax"=>0, "%ecx"=>1, "%edx"=>2, "%ebx"=>3,
+ "%esp"=>4, "%ebp"=>5, "%esi"=>6, "%edi"=>7 );
+
+sub rex {
+ my $opcode=shift;
+ my ($dst,$src,$rex)=@_;
+
+ $rex|=0x04 if($dst>=8);
+ $rex|=0x01 if($src>=8);
+ push @$opcode,($rex|0x40) if ($rex);
+}
+
+my $movq = sub { # elderly gas can't handle inter-register movq
+ my $arg = shift;
+ my @opcode=(0x66);
+ if ($arg =~ /%xmm([0-9]+),\s*%r(\w+)/) {
+ my ($src,$dst)=($1,$2);
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,$src,$dst,0x8);
+ push @opcode,0x0f,0x7e;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ @opcode;
+ } elsif ($arg =~ /%r(\w+),\s*%xmm([0-9]+)/) {
+ my ($src,$dst)=($2,$1);
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,$src,$dst,0x8);
+ push @opcode,0x0f,0x6e;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pextrd = sub {
+ if (shift =~ /\$([0-9]+),\s*%xmm([0-9]+),\s*(%\w+)/) {
+ my @opcode=(0x66);
+ my $imm=$1;
+ my $src=$2;
+ my $dst=$3;
+ if ($dst =~ /%r([0-9]+)d/) { $dst = $1; }
+ elsif ($dst =~ /%e/) { $dst = $regrm{$dst}; }
+ rex(\@opcode,$src,$dst);
+ push @opcode,0x0f,0x3a,0x16;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ push @opcode,$imm;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pinsrd = sub {
+ if (shift =~ /\$([0-9]+),\s*(%\w+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ my $imm=$1;
+ my $src=$2;
+ my $dst=$3;
+ if ($src =~ /%r([0-9]+)/) { $src = $1; }
+ elsif ($src =~ /%e/) { $src = $regrm{$src}; }
+ rex(\@opcode,$dst,$src);
+ push @opcode,0x0f,0x3a,0x22;
+ push @opcode,0xc0|(($dst&7)<<3)|($src&7); # ModR/M
+ push @opcode,$imm;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pshufb = sub {
+ if (shift =~ /%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$2,$1);
+ push @opcode,0x0f,0x38,0x00;
+ push @opcode,0xc0|($1&7)|(($2&7)<<3); # ModR/M
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $palignr = sub {
+ if (shift =~ /\$([0-9]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$3,$2);
+ push @opcode,0x0f,0x3a,0x0f;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ push @opcode,$1;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pclmulqdq = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$3,$2);
+ push @opcode,0x0f,0x3a,0x44;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $rdrand = sub {
+ if (shift =~ /%[er](\w+)/) {
+ my @opcode=();
+ my $dst=$1;
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,0,$dst,8);
+ push @opcode,0x0f,0xc7,0xf0|($dst&7);
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $rdseed = sub {
+ if (shift =~ /%[er](\w+)/) {
+ my @opcode=();
+ my $dst=$1;
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,0,$dst,8);
+ push @opcode,0x0f,0xc7,0xf8|($dst&7);
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+# Not all AVX-capable assemblers recognize AMD XOP extension. Since we
+# are using only two instructions hand-code them in order to be excused
+# from chasing assembler versions...
+
+sub rxb {
+ my $opcode=shift;
+ my ($dst,$src1,$src2,$rxb)=@_;
+
+ $rxb|=0x7<<5;
+ $rxb&=~(0x04<<5) if($dst>=8);
+ $rxb&=~(0x01<<5) if($src1>=8);
+ $rxb&=~(0x02<<5) if($src2>=8);
+ push @$opcode,$rxb;
+}
+
+my $vprotd = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x8f);
+ rxb(\@opcode,$3,$2,-1,0x08);
+ push @opcode,0x78,0xc2;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $vprotq = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x8f);
+ rxb(\@opcode,$3,$2,-1,0x08);
+ push @opcode,0x78,0xc3;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+# Intel Control-flow Enforcement Technology extension. All functions and
+# indirect branch targets will have to start with this instruction...
+
+my $endbranch = sub {
+ (0xf3,0x0f,0x1e,0xfa);
+};
+
+########################################################################
+
+if ($nasm) {
+ print <<___;
+default rel
+%define XMMWORD
+%define YMMWORD
+%define ZMMWORD
+___
+} elsif ($masm) {
+ print <<___;
+OPTION DOTNAME
+___
+}
+while(defined(my $line=<>)) {
+
+ $line =~ s|\R$||; # Better chomp
+
+ $line =~ s|[#!].*$||; # get rid of asm-style comments...
+ $line =~ s|/\*.*\*/||; # ... and C-style comments...
+ $line =~ s|^\s+||; # ... and skip white spaces in beginning
+ $line =~ s|\s+$||; # ... and at the end
+
+ if (my $label=label->re(\$line)) { print $label->out(); }
+
+ if (my $directive=directive->re(\$line)) {
+ printf "%s",$directive->out();
+ } elsif (my $opcode=opcode->re(\$line)) {
+ my $asm = eval("\$".$opcode->mnemonic());
+
+ if ((ref($asm) eq 'CODE') && scalar(my @bytes=&$asm($line))) {
+ print $gas?".byte\t":"DB\t",join(',',@bytes),"\n";
+ next;
+ }
+
+ my @args;
+ ARGUMENT: while (1) {
+ my $arg;
+
+ ($arg=register->re(\$line, $opcode))||
+ ($arg=const->re(\$line)) ||
+ ($arg=ea->re(\$line, $opcode)) ||
+ ($arg=expr->re(\$line, $opcode)) ||
+ last ARGUMENT;
+
+ push @args,$arg;
+
+ last ARGUMENT if ($line !~ /^,/);
+
+ $line =~ s/^,\s*//;
+ } # ARGUMENT:
+
+ if ($#args>=0) {
+ my $insn;
+ my $sz=$opcode->size();
+
+ if ($gas) {
+ $insn = $opcode->out($#args>=1?$args[$#args]->size():$sz);
+ @args = map($_->out($sz),@args);
+ printf "\t%s\t%s",$insn,join(",",@args);
+ } else {
+ $insn = $opcode->out();
+ foreach (@args) {
+ my $arg = $_->out();
+ # $insn.=$sz compensates for movq, pinsrw, ...
+ if ($arg =~ /^xmm[0-9]+$/) { $insn.=$sz; $sz="x" if(!$sz); last; }
+ if ($arg =~ /^ymm[0-9]+$/) { $insn.=$sz; $sz="y" if(!$sz); last; }
+ if ($arg =~ /^zmm[0-9]+$/) { $insn.=$sz; $sz="z" if(!$sz); last; }
+ if ($arg =~ /^mm[0-9]+$/) { $insn.=$sz; $sz="q" if(!$sz); last; }
+ }
+ @args = reverse(@args);
+ undef $sz if ($nasm && $opcode->mnemonic() eq "lea");
+ printf "\t%s\t%s",$insn,join(",",map($_->out($sz),@args));
+ }
+ } else {
+ printf "\t%s",$opcode->out();
+ }
+ }
+
+ print $line,"\n";
+}
+
+print "\n$current_segment\tENDS\n" if ($current_segment && $masm);
+print "END\n" if ($masm);
+
+close STDOUT or die "error closing 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 accommodated 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]. 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" existence,
+# 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
+#
+ #################################################
+# 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
+# magic_epilogue:
+# 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;
+# ULONG64 rip = context->Rip;
+#
+# if (rip >= magic_point)
+# { rsp = (ULONG64 *)context->Rsp;
+# if (rip < magic_epilogue)
+# { rsp = (ULONG64 *)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 function_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...
+#
+# SE handlers are also involved in unwinding stack when executable is
+# profiled or debugged. Profiling implies additional limitations that
+# are too subtle to discuss here. For now it's sufficient to say that
+# in order to simplify handlers one should either a) offload original
+# %rsp to stack (like discussed above); or b) if you have a register to
+# spare for frame pointer, choose volatile one.
+#
+# (*) Note that we're talking about run-time, not debug-time. Lack of
+# unwind information makes debugging hard on both Windows and
+# Unix. "Unlike" refers to the fact that on Unix signal handler
+# will always be invoked, core dumped and appropriate exit code
+# returned to parent (for user notification).