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openssl/crypto/bn/asm/via-mont.pl
David Benjamin 32be631ca1 Do not silently truncate files on perlasm errors 
If one of the perlasm xlate drivers crashes, OpenSSL's build will
currently swallow the error and silently truncate the output to however
far the driver got. This will hopefully fail to build, but better to
check such things.

Handle this by checking for errors when closing STDOUT (which is a pipe
to the xlate driver).

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10883)
2020-01-22 18:11:30 +01:00

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#! /usr/bin/env perl
# Copyright 2006-2018 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
#
# ====================================================================
# 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/.
# ====================================================================
#
# Wrapper around 'rep montmul', VIA-specific instruction accessing
# PadLock Montgomery Multiplier. The wrapper is designed as drop-in
# replacement for OpenSSL bn_mul_mont [first implemented in 0.9.9].
#
# Below are interleaved outputs from 'openssl speed rsa dsa' for 4
# different software configurations on 1.5GHz VIA Esther processor.
# Lines marked with "software integer" denote performance of hand-
# coded integer-only assembler found in OpenSSL 0.9.7. "Software SSE2"
# refers to hand-coded SSE2 Montgomery multiplication procedure found
# OpenSSL 0.9.9. "Hardware VIA SDK" refers to padlock_pmm routine from
# Padlock SDK 2.0.1 available for download from VIA, which naturally
# utilizes the magic 'repz montmul' instruction. And finally "hardware
# this" refers to *this* implementation which also uses 'repz montmul'
#
# sign verify sign/s verify/s
# rsa 512 bits 0.001720s 0.000140s 581.4 7149.7 software integer
# rsa 512 bits 0.000690s 0.000086s 1450.3 11606.0 software SSE2
# rsa 512 bits 0.006136s 0.000201s 163.0 4974.5 hardware VIA SDK
# rsa 512 bits 0.000712s 0.000050s 1404.9 19858.5 hardware this
#
# rsa 1024 bits 0.008518s 0.000413s 117.4 2420.8 software integer
# rsa 1024 bits 0.004275s 0.000277s 233.9 3609.7 software SSE2
# rsa 1024 bits 0.012136s 0.000260s 82.4 3844.5 hardware VIA SDK
# rsa 1024 bits 0.002522s 0.000116s 396.5 8650.9 hardware this
#
# rsa 2048 bits 0.050101s 0.001371s 20.0 729.6 software integer
# rsa 2048 bits 0.030273s 0.001008s 33.0 991.9 software SSE2
# rsa 2048 bits 0.030833s 0.000976s 32.4 1025.1 hardware VIA SDK
# rsa 2048 bits 0.011879s 0.000342s 84.2 2921.7 hardware this
#
# rsa 4096 bits 0.327097s 0.004859s 3.1 205.8 software integer
# rsa 4096 bits 0.229318s 0.003859s 4.4 259.2 software SSE2
# rsa 4096 bits 0.233953s 0.003274s 4.3 305.4 hardware VIA SDK
# rsa 4096 bits 0.070493s 0.001166s 14.2 857.6 hardware this
#
# dsa 512 bits 0.001342s 0.001651s 745.2 605.7 software integer
# dsa 512 bits 0.000844s 0.000987s 1185.3 1013.1 software SSE2
# dsa 512 bits 0.001902s 0.002247s 525.6 444.9 hardware VIA SDK
# dsa 512 bits 0.000458s 0.000524s 2182.2 1909.1 hardware this
#
# dsa 1024 bits 0.003964s 0.004926s 252.3 203.0 software integer
# dsa 1024 bits 0.002686s 0.003166s 372.3 315.8 software SSE2
# dsa 1024 bits 0.002397s 0.002823s 417.1 354.3 hardware VIA SDK
# dsa 1024 bits 0.000978s 0.001170s 1022.2 855.0 hardware this
#
# dsa 2048 bits 0.013280s 0.016518s 75.3 60.5 software integer
# dsa 2048 bits 0.009911s 0.011522s 100.9 86.8 software SSE2
# dsa 2048 bits 0.009542s 0.011763s 104.8 85.0 hardware VIA SDK
# dsa 2048 bits 0.002884s 0.003352s 346.8 298.3 hardware this
#
# To give you some other reference point here is output for 2.4GHz P4
# running hand-coded SSE2 bn_mul_mont found in 0.9.9, i.e. "software
# SSE2" in above terms.
#
# rsa 512 bits 0.000407s 0.000047s 2454.2 21137.0
# rsa 1024 bits 0.002426s 0.000141s 412.1 7100.0
# rsa 2048 bits 0.015046s 0.000491s 66.5 2034.9
# rsa 4096 bits 0.109770s 0.002379s 9.1 420.3
# dsa 512 bits 0.000438s 0.000525s 2281.1 1904.1
# dsa 1024 bits 0.001346s 0.001595s 742.7 627.0
# dsa 2048 bits 0.004745s 0.005582s 210.7 179.1
#
# Conclusions:
# - VIA SDK leaves a *lot* of room for improvement (which this
# implementation successfully fills:-);
# - 'rep montmul' gives up to >3x performance improvement depending on
# key length;
# - in terms of absolute performance it delivers approximately as much
# as modern out-of-order 32-bit cores [again, for longer keys].
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
push(@INC,"${dir}","${dir}../../perlasm");
require "x86asm.pl";
$output = pop and open STDOUT,">$output";
&asm_init($ARGV[0]);
# int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np,const BN_ULONG *n0, int num);
$func="bn_mul_mont_padlock";
$pad=16*1; # amount of reserved bytes on top of every vector
# stack layout
$mZeroPrime=&DWP(0,"esp"); # these are specified by VIA
$A=&DWP(4,"esp");
$B=&DWP(8,"esp");
$T=&DWP(12,"esp");
$M=&DWP(16,"esp");
$scratch=&DWP(20,"esp");
$rp=&DWP(24,"esp"); # these are mine
$sp=&DWP(28,"esp");
# &DWP(32,"esp") # 32 byte scratch area
# &DWP(64+(4*$num+$pad)*0,"esp") # padded tp[num]
# &DWP(64+(4*$num+$pad)*1,"esp") # padded copy of ap[num]
# &DWP(64+(4*$num+$pad)*2,"esp") # padded copy of bp[num]
# &DWP(64+(4*$num+$pad)*3,"esp") # padded copy of np[num]
# Note that SDK suggests to unconditionally allocate 2K per vector. This
# has quite an impact on performance. It naturally depends on key length,
# but to give an example 1024 bit private RSA key operations suffer >30%
# penalty. I allocate only as much as actually required...
&function_begin($func);
&xor ("eax","eax");
&mov ("ecx",&wparam(5)); # num
# meet VIA's limitations for num [note that the specification
# expresses them in bits, while we work with amount of 32-bit words]
&test ("ecx",3);
&jnz (&label("leave")); # num % 4 != 0
&cmp ("ecx",8);
&jb (&label("leave")); # num < 8
&cmp ("ecx",1024);
&ja (&label("leave")); # num > 1024
&pushf ();
&cld ();
&mov ("edi",&wparam(0)); # rp
&mov ("eax",&wparam(1)); # ap
&mov ("ebx",&wparam(2)); # bp
&mov ("edx",&wparam(3)); # np
&mov ("esi",&wparam(4)); # n0
&mov ("esi",&DWP(0,"esi")); # *n0
&lea ("ecx",&DWP($pad,"","ecx",4)); # ecx becomes vector size in bytes
&lea ("ebp",&DWP(64,"","ecx",4)); # allocate 4 vectors + 64 bytes
&neg ("ebp");
&add ("ebp","esp");
&and ("ebp",-64); # align to cache-line
&xchg ("ebp","esp"); # alloca
&mov ($rp,"edi"); # save rp
&mov ($sp,"ebp"); # save esp
&mov ($mZeroPrime,"esi");
&lea ("esi",&DWP(64,"esp")); # tp
&mov ($T,"esi");
&lea ("edi",&DWP(32,"esp")); # scratch area
&mov ($scratch,"edi");
&mov ("esi","eax");
&lea ("ebp",&DWP(-$pad,"ecx"));
&shr ("ebp",2); # restore original num value in ebp
&xor ("eax","eax");
&mov ("ecx","ebp");
&lea ("ecx",&DWP((32+$pad)/4,"ecx"));# padded tp + scratch
&data_byte(0xf3,0xab); # rep stosl, bzero
&mov ("ecx","ebp");
&lea ("edi",&DWP(64+$pad,"esp","ecx",4));# pointer to ap copy
&mov ($A,"edi");
&data_byte(0xf3,0xa5); # rep movsl, memcpy
&mov ("ecx",$pad/4);
&data_byte(0xf3,0xab); # rep stosl, bzero pad
# edi points at the end of padded ap copy...
&mov ("ecx","ebp");
&mov ("esi","ebx");
&mov ($B,"edi");
&data_byte(0xf3,0xa5); # rep movsl, memcpy
&mov ("ecx",$pad/4);
&data_byte(0xf3,0xab); # rep stosl, bzero pad
# edi points at the end of padded bp copy...
&mov ("ecx","ebp");
&mov ("esi","edx");
&mov ($M,"edi");
&data_byte(0xf3,0xa5); # rep movsl, memcpy
&mov ("ecx",$pad/4);
&data_byte(0xf3,0xab); # rep stosl, bzero pad
# edi points at the end of padded np copy...
# let magic happen...
&mov ("ecx","ebp");
&mov ("esi","esp");
&shl ("ecx",5); # convert word counter to bit counter
&align (4);
&data_byte(0xf3,0x0f,0xa6,0xc0);# rep montmul
&mov ("ecx","ebp");
&lea ("esi",&DWP(64,"esp")); # tp
# edi still points at the end of padded np copy...
&neg ("ebp");
&lea ("ebp",&DWP(-$pad,"edi","ebp",4)); # so just "rewind"
&mov ("edi",$rp); # restore rp
&xor ("edx","edx"); # i=0 and clear CF
&set_label("sub",8);
&mov ("eax",&DWP(0,"esi","edx",4));
&sbb ("eax",&DWP(0,"ebp","edx",4));
&mov (&DWP(0,"edi","edx",4),"eax"); # rp[i]=tp[i]-np[i]
&lea ("edx",&DWP(1,"edx")); # i++
&loop (&label("sub")); # doesn't affect CF!
&mov ("eax",&DWP(0,"esi","edx",4)); # upmost overflow bit
&sbb ("eax",0);
&mov ("ecx","edx"); # num
&mov ("edx",0); # i=0
&set_label("copy",8);
&mov ("ebx",&DWP(0,"esi","edx",4));
&mov ("eax",&DWP(0,"edi","edx",4));
&mov (&DWP(0,"esi","edx",4),"ecx"); # zap tp
&cmovc ("eax","ebx");
&mov (&DWP(0,"edi","edx",4),"eax");
&lea ("edx",&DWP(1,"edx")); # i++
&loop (&label("copy"));
&mov ("ebp",$sp);
&xor ("eax","eax");
&mov ("ecx",64/4);
&mov ("edi","esp"); # zap frame including scratch area
&data_byte(0xf3,0xab); # rep stosl, bzero
# zap copies of ap, bp and np
&lea ("edi",&DWP(64+$pad,"esp","edx",4));# pointer to ap
&lea ("ecx",&DWP(3*$pad/4,"edx","edx",2));
&data_byte(0xf3,0xab); # rep stosl, bzero
&mov ("esp","ebp");
&inc ("eax"); # signal "done"
&popf ();
&set_label("leave");
&function_end($func);
&asciz("Padlock Montgomery Multiplication, CRYPTOGAMS by <appro\@openssl.org>");
&asm_finish();
close STDOUT or die "error closing STDOUT";
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