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#! /usr/bin/env perl
# Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (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
# require 'x86asm.pl';
# &asm_init(<flavor>[,$i386only]);
# &function_begin("foo");
# ...
# &function_end("foo");
# &asm_finish
$out=();
$i386=0;
# AUTOLOAD is this context has quite unpleasant side effect, namely
# that typos in function calls effectively go to assembler output,
# but on the pros side we don't have to implement one subroutine per
# each opcode...
sub ::AUTOLOAD
{ my $opcode = $AUTOLOAD;
die "more than 4 arguments passed to $opcode" if ($#_>3);
$opcode =~ s/.*:://;
if ($opcode =~ /^push/) { $stack+=4; }
elsif ($opcode =~ /^pop/) { $stack-=4; }
&generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
}
sub ::emit
{ my $opcode=shift;
if ($#_==-1) { push(@out,"\t$opcode\n"); }
else { push(@out,"\t$opcode\t".join(',',@_)."\n"); }
}
sub ::LB
{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
$1."l";
}
sub ::HB
{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
$1."h";
}
sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); }
sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); }
sub ::blindpop { &pop($_[0]); $stack+=4; }
sub ::wparam { &DWP($stack+4*$_[0],"esp"); }
sub ::swtmp { &DWP(4*$_[0],"esp"); }
sub ::bswap
{ if ($i386) # emulate bswap for i386
{ &comment("bswap @_");
&xchg(&HB(@_),&LB(@_));
&ror (@_,16);
&xchg(&HB(@_),&LB(@_));
}
else
{ &generic("bswap",@_); }
}
# These are made-up opcodes introduced over the years essentially
# by ignorance, just alias them to real ones...
sub ::movb { &mov(@_); }
sub ::xorb { &xor(@_); }
sub ::rotl { &rol(@_); }
sub ::rotr { &ror(@_); }
sub ::exch { &xchg(@_); }
sub ::halt { &hlt; }
sub ::movz { &movzx(@_); }
sub ::pushf { &pushfd; }
sub ::popf { &popfd; }
# 3 argument instructions
sub ::movq
{ my($p1,$p2,$optimize)=@_;
if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
# movq between mmx registers can sink Intel CPUs
{ &::pshufw($p1,$p2,0xe4); }
else
{ &::generic("movq",@_); }
}
# SSE>2 instructions
my %regrm = ( "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7 );
sub ::pextrd
{ my($dst,$src,$imm)=@_;
if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
{ &::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm); }
else
{ &::generic("pextrd",@_); }
}
sub ::pinsrd
{ my($dst,$src,$imm)=@_;
if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
{ &::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm); }
else
{ &::generic("pinsrd",@_); }
}
sub ::pshufb
{ my($dst,$src)=@_;
if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
{ &data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2); }
else
{ &::generic("pshufb",@_); }
}
sub ::palignr
{ my($dst,$src,$imm)=@_;
if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
{ &::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm); }
else
{ &::generic("palignr",@_); }
}
sub ::pclmulqdq
{ my($dst,$src,$imm)=@_;
if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
{ &::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm); }
else
{ &::generic("pclmulqdq",@_); }
}
sub ::rdrand
{ my ($dst)=@_;
if ($dst =~ /(e[a-dsd][ixp])/)
{ &::data_byte(0x0f,0xc7,0xf0|$regrm{$dst}); }
else
{ &::generic("rdrand",@_); }
}
sub ::rdseed
{ my ($dst)=@_;
if ($dst =~ /(e[a-dsd][ixp])/)
{ &::data_byte(0x0f,0xc7,0xf8|$regrm{$dst}); }
else
{ &::generic("rdrand",@_); }
}
sub rxb {
local *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;
}
sub ::vprotd
{ my $args=join(',',@_);
if ($args =~ /xmm([0-7]),xmm([0-7]),([x0-9a-f]+)/)
{ my @opcode=(0x8f);
rxb(\@opcode,$1,$2,-1,0x08);
push @opcode,0x78,0xc2;
push @opcode,0xc0|($2&7)|(($1&7)<<3); # ModR/M
my $c=$3;
push @opcode,$c=~/^0/?oct($c):$c;
&::data_byte(@opcode);
}
else
{ &::generic("vprotd",@_); }
}
sub ::endbranch
{
&::generic("#ifdef __CET__\n");
&::data_byte(0xf3,0x0f,0x1e,0xfb);
&::generic("#endif\n");
}
# label management
$lbdecor="L"; # local label decoration, set by package
$label="000";
sub ::islabel # see is argument is a known label
{ my $i;
foreach $i (values %label) { return $i if ($i eq $_[0]); }
$label{$_[0]}; # can be undef
}
sub ::label # instantiate a function-scope label
{ if (!defined($label{$_[0]}))
{ $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; }
$label{$_[0]};
}
sub ::LABEL # instantiate a file-scope label
{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
$label{$_[0]};
}
sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); }
sub ::set_label_B { push(@out,"@_:\n"); }
sub ::set_label
{ my $label=&::label($_[0]);
&::align($_[1]) if ($_[1]>1);
&::set_label_B($label);
$label;
}
sub ::wipe_labels # wipes function-scope labels
{ foreach $i (keys %label)
{ delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
}
# subroutine management
sub ::function_begin
{ &function_begin_B(@_);
$stack=4;
&push("ebp");
&push("ebx");
&push("esi");
&push("edi");
}
sub ::function_end
{ &pop("edi");
&pop("esi");
&pop("ebx");
&pop("ebp");
&ret();
&function_end_B(@_);
$stack=0;
&wipe_labels();
}
sub ::function_end_A
{ &pop("edi");
&pop("esi");
&pop("ebx");
&pop("ebp");
&ret();
$stack+=16; # readjust esp as if we didn't pop anything
}
sub ::asciz
{ my @str=unpack("C*",shift);
push @str,0;
while ($#str>15) {
&data_byte(@str[0..15]);
foreach (0..15) { shift @str; }
}
&data_byte(@str) if (@str);
}
sub ::asm_finish
{ &file_end();
print @out;
}
sub ::asm_init
{ my ($type,$cpu)=@_;
$i386=$cpu;
$elf=$cpp=$coff=$aout=$macosx=$win32=$mwerks=$android=0;
if (($type eq "elf"))
{ $elf=1; require "x86gas.pl"; }
elsif (($type eq "elf-1"))
{ $elf=-1; require "x86gas.pl"; }
elsif (($type eq "a\.out"))
{ $aout=1; require "x86gas.pl"; }
elsif (($type eq "coff" or $type eq "gaswin"))
{ $coff=1; require "x86gas.pl"; }
elsif (($type eq "win32n"))
{ $win32=1; require "x86nasm.pl"; }
elsif (($type eq "win32"))
{ $win32=1; require "x86masm.pl"; }
elsif (($type eq "macosx"))
{ $aout=1; $macosx=1; require "x86gas.pl"; }
elsif (($type eq "android"))
{ $elf=1; $android=1; require "x86gas.pl"; }
else
{ print STDERR <<"EOF";
Pick one target type from
elf - Linux, FreeBSD, Solaris x86, etc.
a.out - DJGPP, elder OpenBSD, etc.
coff - GAS/COFF such as Win32 targets
win32n - Windows 95/Windows NT NASM format
macosx - Mac OS X
EOF
exit(1);
}
$pic=0;
for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
&file();
}
sub ::hidden {}
1;
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