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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/.
# ====================================================================
#
# The module implements "4-bit" Galois field multiplication and
# streamed GHASH function. "4-bit" means that it uses 256 bytes
# per-key table [+128 bytes fixed table]. Performance results are for
# streamed GHASH subroutine and are expressed in cycles per processed
# byte, less is better:
#
# gcc 3.4.x assembler
#
# Opteron 18.5 10.2 +80%
# Core2 26.0 16.4 +58%
$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";
# per-function register layout
$Xi="%rdi";
$Htbl="%rsi";
$cnt="%rcx";
$rem="%rdx";
sub lo() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/;
$r =~ s/%[er]([sd]i)/%\1l/;
$r =~ s/%(r[0-9]+)[d]?/%\1b/; $r; }
{ my $N;
sub loop() {
my $inp = shift;
$N++;
$code.=<<___;
xor $nlo,$nlo
xor $nhi,$nhi
mov `&lo("$Zlo")`,`&lo("$nlo")`
mov `&lo("$Zlo")`,`&lo("$nhi")`
shl \$4,`&lo("$nlo")`
mov \$14,$cnt
mov 8($Htbl,$nlo),$Zlo
mov ($Htbl,$nlo),$Zhi
and \$0xf0,`&lo("$nhi")`
mov $Zlo,$rem
jmp .Loop$N
.align 16
.Loop$N:
shr \$4,$Zlo
and \$0xf,$rem
mov $Zhi,$tmp
mov ($inp,$cnt),`&lo("$nlo")`
shr \$4,$Zhi
xor 8($Htbl,$nhi),$Zlo
shl \$60,$tmp
xor ($Htbl,$nhi),$Zhi
mov `&lo("$nlo")`,`&lo("$nhi")`
xor ($rem_4bit,$rem,8),$Zhi
mov $Zlo,$rem
shl \$4,`&lo("$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,`&lo("$nhi")`
xor ($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,`&lo("$nhi")`
xor ($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
___
}}
$code=<<___;
.text
.globl gcm_gmult_4bit
.type gcm_gmult_4bit,\@function,2
.align 16
gcm_gmult_4bit:
push %rbx
push %rbp
push %r12
sub \$16,%rsp
.Lgmult_prologue:
movzb 15($Xi),$Zlo
lea .Lrem_4bit(%rip),$rem_4bit
___
&loop ($Xi);
$code.=<<___;
mov $Zlo,8($Xi)
mov $Zhi,($Xi)
mov 32(%rsp),%rbx
lea 40(%rsp),%rsp
.Lgmult_epilogue:
ret
.size gcm_gmult_4bit,.-gcm_gmult_4bit
___
# per-function register layout
$inp="%rdi";
$len="%rsi";
$Xi="%rdx";
$Htbl="%rcx";
$cnt="%rbp";
$rem="%r12";
$code.=<<___;
.globl gcm_ghash_4bit
.type gcm_ghash_4bit,\@function,4
.align 16
gcm_ghash_4bit:
push %rbx
push %rbp
push %r12
sub \$16,%rsp
.Lghash_prologue:
mov 8($Xi),$Zlo
mov ($Xi),$Zhi
add $inp,$len
lea .Lrem_4bit(%rip),$rem_4bit
.align 4
.Louter_loop:
xor 8($inp),$Zlo
xor ($inp),$Zhi
lea 16($inp),$inp
mov $Zlo,8(%rsp)
mov $Zhi,(%rsp)
shr \$56,$Zlo
___
&loop ("%rsp");
$code.=<<___;
cmp $len,$inp
jb .Louter_loop
mov $Zlo,8($Xi)
mov $Zhi,($Xi)
mov 16(%rsp),%r12
mov 24(%rsp),%rbp
mov 32(%rsp),%rbx
lea 40(%rsp),%rsp
.Lghash_epilogue:
ret
.size gcm_ghash_4bit,.-gcm_ghash_4bit
.align 64
.type rem_4bit,\@object
.Lrem_4bit:
.long 0,`0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`
.long 0,`0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`
.long 0,`0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`
.long 0,`0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`
.asciz "GHASH for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
.align 64
___
# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
# CONTEXT *context,DISPATCHER_CONTEXT *disp)
if ($win64) {
$rec="%rcx";
$frame="%rdx";
$context="%r8";
$disp="%r9";
$code.=<<___;
.extern __imp_RtlVirtualUnwind
.type se_handler,\@abi-omnipotent
.align 16
se_handler:
push %rsi
push %rdi
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
pushfq
sub \$64,%rsp
mov 120($context),%rax # pull context->Rax
mov 248($context),%rbx # pull context->Rip
mov 8($disp),%rsi # disp->ImageBase
mov 56($disp),%r11 # disp->HandlerData
mov 0(%r11),%r10d # HandlerData[0]
lea (%rsi,%r10),%r10 # prologue label
cmp %r10,%rbx # context->Rip<prologue label
jb .Lin_prologue
mov 152($context),%rax # pull context->Rsp
mov 4(%r11),%r10d # HandlerData[1]
lea (%rsi,%r10),%r10 # epilogue label
cmp %r10,%rbx # context->Rip>=epilogue label
jae .Lin_prologue
lea 40(%rax),%rax # adjust "rsp"
mov -8(%rax),%rbx
mov -16(%rax),%rbp
mov -24(%rax),%r12
mov %rbx,144($context) # restore context->Rbx
mov %rbp,160($context) # restore context->Rbp
mov %r12,216($context) # restore context->R12
.Lin_prologue:
mov 8(%rax),%rdi
mov 16(%rax),%rsi
mov %rax,152($context) # restore context->Rsp
mov %rsi,168($context) # restore context->Rsi
mov %rdi,176($context) # restore context->Rdi
mov 40($disp),%rdi # disp->ContextRecord
mov $context,%rsi # context
mov \$`1232/8`,%ecx # sizeof(CONTEXT)
.long 0xa548f3fc # cld; rep movsq
mov $disp,%rsi
xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
mov 8(%rsi),%rdx # arg2, disp->ImageBase
mov 0(%rsi),%r8 # arg3, disp->ControlPc
mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
mov 40(%rsi),%r10 # disp->ContextRecord
lea 56(%rsi),%r11 # &disp->HandlerData
lea 24(%rsi),%r12 # &disp->EstablisherFrame
mov %r10,32(%rsp) # arg5
mov %r11,40(%rsp) # arg6
mov %r12,48(%rsp) # arg7
mov %rcx,56(%rsp) # arg8, (NULL)
call *__imp_RtlVirtualUnwind(%rip)
mov \$1,%eax # ExceptionContinueSearch
add \$64,%rsp
popfq
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
pop %rdi
pop %rsi
ret
.size se_handler,.-se_handler
.section .pdata
.align 4
.rva .LSEH_begin_gcm_gmult_4bit
.rva .LSEH_end_gcm_gmult_4bit
.rva .LSEH_info_gcm_gmult_4bit
.rva .LSEH_begin_gcm_ghash_4bit
.rva .LSEH_end_gcm_ghash_4bit
.rva .LSEH_info_gcm_ghash_4bit
.section .xdata
.align 8
.LSEH_info_gcm_gmult_4bit:
.byte 9,0,0,0
.rva se_handler
.rva .Lgmult_prologue,.Lgmult_epilogue # HandlerData
.LSEH_info_gcm_ghash_4bit:
.byte 9,0,0,0
.rva se_handler
.rva .Lghash_prologue,.Lghash_epilogue # HandlerData
___
}
$code =~ s/\`([^\`]*)\`/eval($1)/gem;
print $code;
close STDOUT;
|