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|
#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see http://www.openssl.org/~appro/cryptogams/.
# ====================================================================
#
# March, June 2010
#
# The module implements "4-bit" GCM GHASH function and underlying
# single multiplication operation in GF(2^128). "4-bit" means that
# it uses 256 bytes per-key table [+128 bytes shared table]. GHASH
# function features so called "528B" variant utilizing additional
# 256+16 bytes of per-key storage [+512 bytes shared table].
# Performance results are for this streamed GHASH subroutine and are
# expressed in cycles per processed byte, less is better:
#
# gcc 3.4.x(*) assembler
#
# P4 28.6 14.0 +100%
# Opteron 19.3 7.7 +150%
# Core2 17.8 8.1(**) +120%
#
# (*) comparison is not completely fair, because C results are
# for vanilla "256B" implementation, while assembler results
# are for "528B";-)
# (**) it's mystery [to me] why Core2 result is not same as for
# Opteron;
# May 2010
#
# Add PCLMULQDQ version performing at 2.02 cycles per processed byte.
# See ghash-x86.pl for background information and details about coding
# techniques.
#
# Special thanks to David Woodhouse <dwmw2@infradead.org> for
# providing access to a Westmere-based system on behalf of Intel
# Open Source Technology Centre.
$flavour = shift;
$output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
$win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
die "can't locate x86_64-xlate.pl";
open STDOUT,"| $^X $xlate $flavour $output";
# common register layout
$nlo="%rax";
$nhi="%rbx";
$Zlo="%r8";
$Zhi="%r9";
$tmp="%r10";
$rem_4bit = "%r11";
$Xi="%rdi";
$Htbl="%rsi";
# per-function register layout
$cnt="%rcx";
$rem="%rdx";
sub LB() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/ or
$r =~ s/%[er]([sd]i)/%\1l/ or
$r =~ s/%[er](bp)/%\1l/ or
$r =~ s/%(r[0-9]+)[d]?/%\1b/; $r; }
sub AUTOLOAD() # thunk [simplified] 32-bit style perlasm
{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://;
my $arg = pop;
$arg = "\$$arg" if ($arg*1 eq $arg);
$code .= "\t$opcode\t".join(',',$arg,reverse @_)."\n";
}
{ my $N;
sub loop() {
my $inp = shift;
$N++;
$code.=<<___;
xor $nlo,$nlo
xor $nhi,$nhi
mov `&LB("$Zlo")`,`&LB("$nlo")`
mov `&LB("$Zlo")`,`&LB("$nhi")`
shl \$4,`&LB("$nlo")`
mov \$14,$cnt
mov 8($Htbl,$nlo),$Zlo
mov ($Htbl,$nlo),$Zhi
and \$0xf0,`&LB("$nhi")`
mov $Zlo,$rem
jmp .Loop$N
.align 16
.Loop$N:
shr \$4,$Zlo
and \$0xf,$rem
mov $Zhi,$tmp
mov ($inp,$cnt),`&LB("$nlo")`
shr \$4,$Zhi
xor 8($Htbl,$nhi),$Zlo
shl \$60,$tmp
xor ($Htbl,$nhi),$Zhi
mov `&LB("$nlo")`,`&LB("$nhi")`
xor ($rem_4bit,$rem,8),$Zhi
mov $Zlo,$rem
shl \$4,`&LB("$nlo")`
xor $tmp,$Zlo
dec $cnt
js .Lbreak$N
shr \$4,$Zlo
and \$0xf,$rem
mov $Zhi,$tmp
shr \$4,$Zhi
xor 8($Htbl,$nlo),$Zlo
shl \$60,$tmp
xor ($Htbl,$nlo),$Zhi
and \$0xf0,`&LB("$nhi")`
xor ($rem_4bit,$rem,8),$Zhi
mov $Zlo,$rem
xor $tmp,$Zlo
jmp .Loop$N
.align 16
.Lbreak$N:
shr \$4,$Zlo
and \$0xf,$rem
mov $Zhi,$tmp
shr \$4,$Zhi
xor 8($Htbl,$nlo),$Zlo
shl \$60,$tmp
xor ($Htbl,$nlo),$Zhi
and \$0xf0,`&LB("$nhi")`
xor ($rem_4bit,$rem,8),$Zhi
mov $Zlo,$rem
xor $tmp,$Zlo
shr \$4,$Zlo
and \$0xf,$rem
mov $Zhi,$tmp
shr \$4,$Zhi
xor 8($Htbl,$nhi),$Zlo
shl \$60,$tmp
xor ($Htbl,$nhi),$Zhi
xor $tmp,$Zlo
xor ($rem_4bit,$rem,8),$Zhi
bswap $Zlo
bswap $Zhi
___
}}
$code=<<___;
.text
.globl gcm_gmult_4bit
.type gcm_gmult_4bit,\@function,2
.align 16
gcm_gmult_4bit:
push %rbx
push %rbp # %rbp and %r12 are pushed exclusively in
push %r12 # order to reuse Win64 exception handler...
.Lgmult_prologue:
movzb 15($Xi),$Zlo
lea .Lrem_4bit(%rip),$rem_4bit
___
&loop ($Xi);
$code.=<<___;
mov $Zlo,8($Xi)
mov $Zhi,($Xi)
mov 16(%rsp),%rbx
lea 24(%rsp),%rsp
.Lgmult_epilogue:
ret
.size gcm_gmult_4bit,.-gcm_gmult_4bit
___
# per-function register layout
$inp="%rdx";
$len="%rcx";
$rem_8bit=$rem_4bit;
$code.=<<___;
.globl gcm_ghash_4bit
.type gcm_ghash_4bit,\@function,4
.align 16
gcm_ghash_4bit:
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
sub \$280,%rsp
.Lghash_prologue:
mov $inp,%r14 # reassign couple of args
mov $len,%r15
___
{ my $inp="%r14";
my $dat="%edx";
my $len="%r15";
my @nhi=("%ebx","%ecx");
my @rem=("%r12","%r13");
my $Hshr4="%rbp";
&sub ($Htbl,-128); # size optimization
&lea ($Hshr4,"16+128(%rsp)");
{ my @lo =($nlo,$nhi);
my @hi =($Zlo,$Zhi);
&xor ($dat,$dat);
for ($i=0,$j=-2;$i<18;$i++,$j++) {
&mov ("$j(%rsp)",&LB($dat)) if ($i>1);
&or ($lo[0],$tmp) if ($i>1);
&mov (&LB($dat),&LB($lo[1])) if ($i>0 && $i<17);
&shr ($lo[1],4) if ($i>0 && $i<17);
&mov ($tmp,$hi[1]) if ($i>0 && $i<17);
&shr ($hi[1],4) if ($i>0 && $i<17);
&mov ("8*$j($Hshr4)",$hi[0]) if ($i>1);
&mov ($hi[0],"16*$i+0-128($Htbl)") if ($i<16);
&shl (&LB($dat),4) if ($i>0 && $i<17);
&mov ("8*$j-128($Hshr4)",$lo[0]) if ($i>1);
&mov ($lo[0],"16*$i+8-128($Htbl)") if ($i<16);
&shl ($tmp,60) if ($i>0 && $i<17);
push
|