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openssl/crypto/sha/asm/sha1-x86_64.pl

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Perl
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#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> 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/.
# ====================================================================
#
# sha1_block procedure for x86_64.
#
# It was brought to my attention that on EM64T compiler-generated code
# was far behind 32-bit assembler implementation. This is unlike on
# Opteron where compiler-generated code was only 15% behind 32-bit
# assembler, which originally made it hard to motivate the effort.
# There was suggestion to mechanically translate 32-bit code, but I
# dismissed it, reasoning that x86_64 offers enough register bank
# capacity to fully utilize SHA-1 parallelism. Therefore this fresh
# implementation:-) However! While 64-bit code does perform better
# on Opteron, I failed to beat 32-bit assembler on EM64T core. Well,
# x86_64 does offer larger *addressable* bank, but out-of-order core
# reaches for even more registers through dynamic aliasing, and EM64T
# core must have managed to run-time optimize even 32-bit code just as
# good as 64-bit one. Performance improvement is summarized in the
# following table:
#
# gcc 3.4 32-bit asm cycles/byte
# Opteron +45% +20% 6.8
# Xeon P4 +65% +0% 9.9
# Core2 +60% +10% 7.0
# August 2009.
#
# The code was revised to minimize code size and to maximize
# "distance" between instructions producing input to 'lea'
# instruction and the 'lea' instruction itself, which is essential
# for Intel Atom core.
$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";
$ctx="%rdi"; # 1st arg
$inp="%rsi"; # 2nd arg
$num="%rdx"; # 3rd arg
# reassign arguments in order to produce more compact code
$ctx="%r8";
$inp="%r9";
$num="%r10";
$t0="%eax";
$t1="%ebx";
$t2="%ecx";
@xi=("%edx","%ebp");
$A="%esi";
$B="%edi";
$C="%r11d";
$D="%r12d";
$E="%r13d";
@V=($A,$B,$C,$D,$E);
sub BODY_00_19 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $j=$i+1;
$code.=<<___ if ($i==0);
mov `4*$i`($inp),$xi[0]
bswap $xi[0]
mov $xi[0],`4*$i`(%rsp)
___
$code.=<<___ if ($i<15);
mov $c,$t0
mov `4*$j`($inp),$xi[1]
mov $a,$t2
xor $d,$t0
bswap $xi[1]
rol \$5,$t2
lea 0x5a827999($xi[0],$e),$e
and $b,$t0
mov $xi[1],`4*$j`(%rsp)
add $t2,$e
xor $d,$t0
rol \$30,$b
add $t0,$e
___
$code.=<<___ if ($i>=15);
mov `4*($j%16)`(%rsp),$xi[1]
mov $c,$t0
mov $a,$t2
xor `4*(($j+2)%16)`(%rsp),$xi[1]
xor $d,$t0
rol \$5,$t2
xor `4*(($j+8)%16)`(%rsp),$xi[1]
and $b,$t0
lea 0x5a827999($xi[0],$e),$e
xor `4*(($j+13)%16)`(%rsp),$xi[1]
xor $d,$t0
rol \$1,$xi[1]
add $t2,$e
rol \$30,$b
mov $xi[1],`4*($j%16)`(%rsp)
add $t0,$e
___
unshift(@xi,pop(@xi));
}
sub BODY_20_39 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $j=$i+1;
my $K=($i<40)?0x6ed9eba1:0xca62c1d6;
$code.=<<___ if ($i<79);
mov `4*($j%16)`(%rsp),$xi[1]
mov $c,$t0
mov $a,$t2
xor `4*(($j+2)%16)`(%rsp),$xi[1]
xor $b,$t0
rol \$5,$t2
lea $K($xi[0],$e),$e
xor `4*(($j+8)%16)`(%rsp),$xi[1]
xor $d,$t0
add $t2,$e
xor `4*(($j+13)%16)`(%rsp),$xi[1]
rol \$30,$b
add $t0,$e
rol \$1,$xi[1]
___
$code.=<<___ if ($i<76);
mov $xi[1],`4*($j%16)`(%rsp)
___
$code.=<<___ if ($i==79);
mov $c,$t0
mov $a,$t2
xor $b,$t0
lea $K($xi[0],$e),$e
rol \$5,$t2
xor $d,$t0
add $t2,$e
rol \$30,$b
add $t0,$e
___
unshift(@xi,pop(@xi));
}
sub BODY_40_59 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $j=$i+1;
$code.=<<___;
mov `4*($j%16)`(%rsp),$xi[1]
mov $c,$t0
mov $c,$t1
xor `4*(($j+2)%16)`(%rsp),$xi[1]
and $d,$t0
mov $a,$t2
xor `4*(($j+8)%16)`(%rsp),$xi[1]
xor $d,$t1
lea 0x8f1bbcdc($xi[0],$e),$e
rol \$5,$t2
xor `4*(($j+13)%16)`(%rsp),$xi[1]
add $t0,$e
and $b,$t1
rol \$1,$xi[1]
add $t1,$e
rol \$30,$b
mov $xi[1],`4*($j%16)`(%rsp)
add $t2,$e
___
unshift(@xi,pop(@xi));
}
$code.=<<___;
.text
.globl sha1_block_data_order
.type sha1_block_data_order,\@function,3
.align 16
sha1_block_data_order:
push %rbx
push %rbp
push %r12
push %r13
mov %rsp,%r11
mov %rdi,$ctx # reassigned argument
sub \$`8+16*4`,%rsp
mov %rsi,$inp # reassigned argument
and \$-64,%rsp
mov %rdx,$num # reassigned argument
mov %r11,`16*4`(%rsp)
.Lprologue:
mov 0($ctx),$A
mov 4($ctx),$B
mov 8($ctx),$C
mov 12($ctx),$D
mov 16($ctx),$E
.align 4
.Lloop:
___
for($i=0;$i<20;$i++) { &BODY_00_19($i,@V); unshift(@V,pop(@V)); }
for(;$i<40;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
for(;$i<60;$i++) { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
for(;$i<80;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
add 0($ctx),$A
add 4($ctx),$B
add 8($ctx),$C
add 12($ctx),$D
add 16($ctx),$E
mov $A,0($ctx)
mov $B,4($ctx)
mov $C,8($ctx)
mov $D,12($ctx)
mov $E,16($ctx)
sub \$1,$num
lea `16*4`($inp),$inp
jnz .Lloop
mov `16*4`(%rsp),%rsi
mov (%rsi),%r13
mov 8(%rsi),%r12
mov 16(%rsi),%rbp
mov 24(%rsi),%rbx
lea 32(%rsi),%rsp
.Lepilogue:
ret
.size sha1_block_data_order,.-sha1_block_data_order
.asciz "SHA1 block transform for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
.align 16
___
# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
# CONTEXT *context,DISPATCHER_CONTEXT *disp)
if ($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($context),%rbx # pull context->Rip
lea .Lprologue(%rip),%r10
cmp %r10,%rbx # context->Rip<.Lprologue
jb .Lin_prologue
mov 152($context),%rax # pull context->Rsp
lea .Lepilogue(%rip),%r10
cmp %r10,%rbx # context->Rip>=.Lepilogue
jae .Lin_prologue
mov `16*4`(%rax),%rax # pull saved stack pointer
lea 32(%rax),%rax
mov -8(%rax),%rbx
mov -16(%rax),%rbp
mov -24(%rax),%r12
mov -32(%rax),%r13
mov %rbx,144($context) # restore context->Rbx
mov %rbp,160($context) # restore context->Rbp
mov %r12,216($context) # restore context->R12
mov %r13,224($context) # restore context->R13
.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 \$154,%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_sha1_block_data_order
.rva .LSEH_end_sha1_block_data_order
.rva .LSEH_info_sha1_block_data_order
.section .xdata
.align 8
.LSEH_info_sha1_block_data_order:
.byte 9,0,0,0
.rva se_handler
___
}
####################################################################
$code =~ s/\`([^\`]*)\`/eval $1/gem;
print $code;
close STDOUT;
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