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boringssl/crypto/modes/asm/ghash-armv4.pl
David Benjamin 3ab3e3db6e Mark ARM assembly globals hidden uniformly in arm-xlate.pl. 
We'd manually marked some of them hidden, but missed some. Do it in the perlasm
driver instead since we will never expose an asm symbol directly. This reduces
some of our divergence from upstream on these files (and indeed we'd
accidentally lose some .hiddens at one point).

BUG=586141

Change-Id: Ie1bfc6f38ba73d33f5c56a8a40c2bf1668562e7e
Reviewed-on: https://boringssl-review.googlesource.com/7140
Reviewed-by: Adam Langley <agl@google.com>
2016-02-11 17:28:03 +00:00

513 lines
13 KiB
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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/.
# ====================================================================
#
# April 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 [+32 bytes shared table]. There is no
# experimental performance data available yet. The only approximation
# that can be made at this point is based on code size. Inner loop is
# 32 instructions long and on single-issue core should execute in <40
# cycles. Having verified that gcc 3.4 didn't unroll corresponding
# loop, this assembler loop body was found to be ~3x smaller than
# compiler-generated one...
#
# July 2010
#
# Rescheduling for dual-issue pipeline resulted in 8.5% improvement on
# Cortex A8 core and ~25 cycles per processed byte (which was observed
# to be ~3 times faster than gcc-generated code:-)
#
# February 2011
#
# Profiler-assisted and platform-specific optimization resulted in 7%
# improvement on Cortex A8 core and ~23.5 cycles per byte.
#
# March 2011
#
# Add NEON implementation featuring polynomial multiplication, i.e. no
# lookup tables involved. On Cortex A8 it was measured to process one
# byte in 15 cycles or 55% faster than integer-only code.
#
# April 2014
#
# Switch to multiplication algorithm suggested in paper referred
# below and combine it with reduction algorithm from x86 module.
# Performance improvement over previous version varies from 65% on
# Snapdragon S4 to 110% on Cortex A9. In absolute terms Cortex A8
# processes one byte in 8.45 cycles, A9 - in 10.2, A15 - in 7.63,
# Snapdragon S4 - in 9.33.
#
# Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R.: Fast Software
# Polynomial Multiplication on ARM Processors using the NEON Engine.
#
# http://conradoplg.cryptoland.net/files/2010/12/mocrysen13.pdf
# ====================================================================
# Note about "528B" variant. In ARM case it makes lesser sense to
# implement it for following reasons:
#
# - performance improvement won't be anywhere near 50%, because 128-
# bit shift operation is neatly fused with 128-bit xor here, and
# "538B" variant would eliminate only 4-5 instructions out of 32
# in the inner loop (meaning that estimated improvement is ~15%);
# - ARM-based systems are often embedded ones and extra memory
# consumption might be unappreciated (for so little improvement);
#
# Byte order [in]dependence. =========================================
#
# Caller is expected to maintain specific *dword* order in Htable,
# namely with *least* significant dword of 128-bit value at *lower*
# address. This differs completely from C code and has everything to
# do with ldm instruction and order in which dwords are "consumed" by
# algorithm. *Byte* order within these dwords in turn is whatever
# *native* byte order on current platform. See gcm128.c for working
# example...
$flavour = shift;
if ($flavour=~/^\w[\w\-]*\.\w+$/) { $output=$flavour; undef $flavour; }
else { while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {} }
if ($flavour && $flavour ne "void") {
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
die "can't locate arm-xlate.pl";
open STDOUT,"| \"$^X\" $xlate $flavour $output";
} else {
open STDOUT,">$output";
}
$Xi="r0"; # argument block
$Htbl="r1";
$inp="r2";
$len="r3";
$Zll="r4"; # variables
$Zlh="r5";
$Zhl="r6";
$Zhh="r7";
$Tll="r8";
$Tlh="r9";
$Thl="r10";
$Thh="r11";
$nlo="r12";
################# r13 is stack pointer
$nhi="r14";
################# r15 is program counter
$rem_4bit=$inp; # used in gcm_gmult_4bit
$cnt=$len;
sub Zsmash() {
my $i=12;
my @args=@_;
for ($Zll,$Zlh,$Zhl,$Zhh) {
$code.=<<___;
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
rev $_,$_
str $_,[$Xi,#$i]
#elif defined(__ARMEB__)
str $_,[$Xi,#$i]
#else
mov $Tlh,$_,lsr#8
strb $_,[$Xi,#$i+3]
mov $Thl,$_,lsr#16
strb $Tlh,[$Xi,#$i+2]
mov $Thh,$_,lsr#24
strb $Thl,[$Xi,#$i+1]
strb $Thh,[$Xi,#$i]
#endif
___
$code.="\t".shift(@args)."\n";
$i-=4;
}
}
$code=<<___;
#include <openssl/arm_arch.h>
.syntax unified
.text
.code 32
#ifdef __clang__
#define ldrplb ldrbpl
#define ldrneb ldrbne
#endif
.type rem_4bit,%object
.align 5
rem_4bit:
.short 0x0000,0x1C20,0x3840,0x2460
.short 0x7080,0x6CA0,0x48C0,0x54E0
.short 0xE100,0xFD20,0xD940,0xC560
.short 0x9180,0x8DA0,0xA9C0,0xB5E0
.size rem_4bit,.-rem_4bit
.type rem_4bit_get,%function
rem_4bit_get:
sub $rem_4bit,pc,#8
sub $rem_4bit,$rem_4bit,#32 @ &rem_4bit
b .Lrem_4bit_got
nop
.size rem_4bit_get,.-rem_4bit_get
.global gcm_ghash_4bit
.type gcm_ghash_4bit,%function
gcm_ghash_4bit:
sub r12,pc,#8
add $len,$inp,$len @ $len to point at the end
stmdb sp!,{r3-r11,lr} @ save $len/end too
sub r12,r12,#48 @ &rem_4bit
ldmia r12,{r4-r11} @ copy rem_4bit ...
stmdb sp!,{r4-r11} @ ... to stack
ldrb $nlo,[$inp,#15]
ldrb $nhi,[$Xi,#15]
.Louter:
eor $nlo,$nlo,$nhi
and $nhi,$nlo,#0xf0
and $nlo,$nlo,#0x0f
mov $cnt,#14
add $Zhh,$Htbl,$nlo,lsl#4
ldmia $Zhh,{$Zll-$Zhh} @ load Htbl[nlo]
add $Thh,$Htbl,$nhi
ldrb $nlo,[$inp,#14]
and $nhi,$Zll,#0xf @ rem
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi]
add $nhi,$nhi,$nhi
eor $Zll,$Tll,$Zll,lsr#4
ldrh $Tll,[sp,$nhi] @ rem_4bit[rem]
eor $Zll,$Zll,$Zlh,lsl#28
ldrb $nhi,[$Xi,#14]
eor $Zlh,$Tlh,$Zlh,lsr#4
eor $Zlh,$Zlh,$Zhl,lsl#28
eor $Zhl,$Thl,$Zhl,lsr#4
eor $Zhl,$Zhl,$Zhh,lsl#28
eor $Zhh,$Thh,$Zhh,lsr#4
eor $nlo,$nlo,$nhi
and $nhi,$nlo,#0xf0
and $nlo,$nlo,#0x0f
eor $Zhh,$Zhh,$Tll,lsl#16
.Linner:
add $Thh,$Htbl,$nlo,lsl#4
and $nlo,$Zll,#0xf @ rem
subs $cnt,$cnt,#1
add $nlo,$nlo,$nlo
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nlo]
eor $Zll,$Tll,$Zll,lsr#4
eor $Zll,$Zll,$Zlh,lsl#28
eor $Zlh,$Tlh,$Zlh,lsr#4
eor $Zlh,$Zlh,$Zhl,lsl#28
ldrh $Tll,[sp,$nlo] @ rem_4bit[rem]
eor $Zhl,$Thl,$Zhl,lsr#4
ldrbpl $nlo,[$inp,$cnt]
eor $Zhl,$Zhl,$Zhh,lsl#28
eor $Zhh,$Thh,$Zhh,lsr#4
add $Thh,$Htbl,$nhi
and $nhi,$Zll,#0xf @ rem
eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem]
add $nhi,$nhi,$nhi
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi]
eor $Zll,$Tll,$Zll,lsr#4
ldrbpl $Tll,[$Xi,$cnt]
eor $Zll,$Zll,$Zlh,lsl#28
eor $Zlh,$Tlh,$Zlh,lsr#4
ldrh $Tlh,[sp,$nhi]
eor $Zlh,$Zlh,$Zhl,lsl#28
eor $Zhl,$Thl,$Zhl,lsr#4
eor $Zhl,$Zhl,$Zhh,lsl#28
eorpl $nlo,$nlo,$Tll
eor $Zhh,$Thh,$Zhh,lsr#4
andpl $nhi,$nlo,#0xf0
andpl $nlo,$nlo,#0x0f
eor $Zhh,$Zhh,$Tlh,lsl#16 @ ^= rem_4bit[rem]
bpl .Linner
ldr $len,[sp,#32] @ re-load $len/end
add $inp,$inp,#16
mov $nhi,$Zll
___
&Zsmash("cmp\t$inp,$len","ldrbne\t$nlo,[$inp,#15]");
$code.=<<___;
bne .Louter
add sp,sp,#36
#if __ARM_ARCH__>=5
ldmia sp!,{r4-r11,pc}
#else
ldmia sp!,{r4-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size gcm_ghash_4bit,.-gcm_ghash_4bit
.global gcm_gmult_4bit
.type gcm_gmult_4bit,%function
gcm_gmult_4bit:
stmdb sp!,{r4-r11,lr}
ldrb $nlo,[$Xi,#15]
b rem_4bit_get
.Lrem_4bit_got:
and $nhi,$nlo,#0xf0
and $nlo,$nlo,#0x0f
mov $cnt,#14
add $Zhh,$Htbl,$nlo,lsl#4
ldmia $Zhh,{$Zll-$Zhh} @ load Htbl[nlo]
ldrb $nlo,[$Xi,#14]
add $Thh,$Htbl,$nhi
and $nhi,$Zll,#0xf @ rem
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi]
add $nhi,$nhi,$nhi
eor $Zll,$Tll,$Zll,lsr#4
ldrh $Tll,[$rem_4bit,$nhi] @ rem_4bit[rem]
eor $Zll,$Zll,$Zlh,lsl#28
eor $Zlh,$Tlh,$Zlh,lsr#4
eor $Zlh,$Zlh,$Zhl,lsl#28
eor $Zhl,$Thl,$Zhl,lsr#4
eor $Zhl,$Zhl,$Zhh,lsl#28
eor $Zhh,$Thh,$Zhh,lsr#4
and $nhi,$nlo,#0xf0
eor $Zhh,$Zhh,$Tll,lsl#16
and $nlo,$nlo,#0x0f
.Loop:
add $Thh,$Htbl,$nlo,lsl#4
and $nlo,$Zll,#0xf @ rem
subs $cnt,$cnt,#1
add $nlo,$nlo,$nlo
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nlo]
eor $Zll,$Tll,$Zll,lsr#4
eor $Zll,$Zll,$Zlh,lsl#28
eor $Zlh,$Tlh,$Zlh,lsr#4
eor $Zlh,$Zlh,$Zhl,lsl#28
ldrh $Tll,[$rem_4bit,$nlo] @ rem_4bit[rem]
eor $Zhl,$Thl,$Zhl,lsr#4
ldrbpl $nlo,[$Xi,$cnt]
eor $Zhl,$Zhl,$Zhh,lsl#28
eor $Zhh,$Thh,$Zhh,lsr#4
add $Thh,$Htbl,$nhi
and $nhi,$Zll,#0xf @ rem
eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem]
add $nhi,$nhi,$nhi
ldmia $Thh,{$Tll-$Thh} @ load Htbl[nhi]
eor $Zll,$Tll,$Zll,lsr#4
eor $Zll,$Zll,$Zlh,lsl#28
eor $Zlh,$Tlh,$Zlh,lsr#4
ldrh $Tll,[$rem_4bit,$nhi] @ rem_4bit[rem]
eor $Zlh,$Zlh,$Zhl,lsl#28
eor $Zhl,$Thl,$Zhl,lsr#4
eor $Zhl,$Zhl,$Zhh,lsl#28
eor $Zhh,$Thh,$Zhh,lsr#4
andpl $nhi,$nlo,#0xf0
andpl $nlo,$nlo,#0x0f
eor $Zhh,$Zhh,$Tll,lsl#16 @ ^= rem_4bit[rem]
bpl .Loop
___
&Zsmash();
$code.=<<___;
#if __ARM_ARCH__>=5
ldmia sp!,{r4-r11,pc}
#else
ldmia sp!,{r4-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size gcm_gmult_4bit,.-gcm_gmult_4bit
___
{
my ($Xl,$Xm,$Xh,$IN)=map("q$_",(0..3));
my ($t0,$t1,$t2,$t3)=map("q$_",(8..12));
my ($Hlo,$Hhi,$Hhl,$k48,$k32,$k16)=map("d$_",(26..31));
sub clmul64x64 {
my ($r,$a,$b)=@_;
$code.=<<___;
vext.8 $t0#lo, $a, $a, #1 @ A1
vmull.p8 $t0, $t0#lo, $b @ F = A1*B
vext.8 $r#lo, $b, $b, #1 @ B1
vmull.p8 $r, $a, $r#lo @ E = A*B1
vext.8 $t1#lo, $a, $a, #2 @ A2
vmull.p8 $t1, $t1#lo, $b @ H = A2*B
vext.8 $t3#lo, $b, $b, #2 @ B2
vmull.p8 $t3, $a, $t3#lo @ G = A*B2
vext.8 $t2#lo, $a, $a, #3 @ A3
veor $t0, $t0, $r @ L = E + F
vmull.p8 $t2, $t2#lo, $b @ J = A3*B
vext.8 $r#lo, $b, $b, #3 @ B3
veor $t1, $t1, $t3 @ M = G + H
vmull.p8 $r, $a, $r#lo @ I = A*B3
veor $t0#lo, $t0#lo, $t0#hi @ t0 = (L) (P0 + P1) << 8
vand $t0#hi, $t0#hi, $k48
vext.8 $t3#lo, $b, $b, #4 @ B4
veor $t1#lo, $t1#lo, $t1#hi @ t1 = (M) (P2 + P3) << 16
vand $t1#hi, $t1#hi, $k32
vmull.p8 $t3, $a, $t3#lo @ K = A*B4
veor $t2, $t2, $r @ N = I + J
veor $t0#lo, $t0#lo, $t0#hi
veor $t1#lo, $t1#lo, $t1#hi
veor $t2#lo, $t2#lo, $t2#hi @ t2 = (N) (P4 + P5) << 24
vand $t2#hi, $t2#hi, $k16
vext.8 $t0, $t0, $t0, #15
veor $t3#lo, $t3#lo, $t3#hi @ t3 = (K) (P6 + P7) << 32
vmov.i64 $t3#hi, #0
vext.8 $t1, $t1, $t1, #14
veor $t2#lo, $t2#lo, $t2#hi
vmull.p8 $r, $a, $b @ D = A*B
vext.8 $t3, $t3, $t3, #12
vext.8 $t2, $t2, $t2, #13
veor $t0, $t0, $t1
veor $t2, $t2, $t3
veor $r, $r, $t0
veor $r, $r, $t2
___
}
$code.=<<___;
#if __ARM_MAX_ARCH__>=7
.arch armv7-a
.fpu neon
.global gcm_init_neon
.type gcm_init_neon,%function
.align 4
gcm_init_neon:
vld1.64 $IN#hi,[r1]! @ load H
vmov.i8 $t0,#0xe1
vld1.64 $IN#lo,[r1]
vshl.i64 $t0#hi,#57
vshr.u64 $t0#lo,#63 @ t0=0xc2....01
vdup.8 $t1,$IN#hi[7]
vshr.u64 $Hlo,$IN#lo,#63
vshr.s8 $t1,#7 @ broadcast carry bit
vshl.i64 $IN,$IN,#1
vand $t0,$t0,$t1
vorr $IN#hi,$Hlo @ H<<<=1
veor $IN,$IN,$t0 @ twisted H
vstmia r0,{$IN}
ret @ bx lr
.size gcm_init_neon,.-gcm_init_neon
.global gcm_gmult_neon
.type gcm_gmult_neon,%function
.align 4
gcm_gmult_neon:
vld1.64 $IN#hi,[$Xi]! @ load Xi
vld1.64 $IN#lo,[$Xi]!
vmov.i64 $k48,#0x0000ffffffffffff
vldmia $Htbl,{$Hlo-$Hhi} @ load twisted H
vmov.i64 $k32,#0x00000000ffffffff
#ifdef __ARMEL__
vrev64.8 $IN,$IN
#endif
vmov.i64 $k16,#0x000000000000ffff
veor $Hhl,$Hlo,$Hhi @ Karatsuba pre-processing
mov $len,#16
b .Lgmult_neon
.size gcm_gmult_neon,.-gcm_gmult_neon
.global gcm_ghash_neon
.type gcm_ghash_neon,%function
.align 4
gcm_ghash_neon:
vld1.64 $Xl#hi,[$Xi]! @ load Xi
vld1.64 $Xl#lo,[$Xi]!
vmov.i64 $k48,#0x0000ffffffffffff
vldmia $Htbl,{$Hlo-$Hhi} @ load twisted H
vmov.i64 $k32,#0x00000000ffffffff
#ifdef __ARMEL__
vrev64.8 $Xl,$Xl
#endif
vmov.i64 $k16,#0x000000000000ffff
veor $Hhl,$Hlo,$Hhi @ Karatsuba pre-processing
.Loop_neon:
vld1.64 $IN#hi,[$inp]! @ load inp
vld1.64 $IN#lo,[$inp]!
#ifdef __ARMEL__
vrev64.8 $IN,$IN
#endif
veor $IN,$Xl @ inp^=Xi
.Lgmult_neon:
___
&clmul64x64 ($Xl,$Hlo,"$IN#lo"); # H.lo·Xi.lo
$code.=<<___;
veor $IN#lo,$IN#lo,$IN#hi @ Karatsuba pre-processing
___
&clmul64x64 ($Xm,$Hhl,"$IN#lo"); # (H.lo+H.hi)·(Xi.lo+Xi.hi)
&clmul64x64 ($Xh,$Hhi,"$IN#hi"); # H.hi·Xi.hi
$code.=<<___;
veor $Xm,$Xm,$Xl @ Karatsuba post-processing
veor $Xm,$Xm,$Xh
veor $Xl#hi,$Xl#hi,$Xm#lo
veor $Xh#lo,$Xh#lo,$Xm#hi @ Xh|Xl - 256-bit result
@ equivalent of reduction_avx from ghash-x86_64.pl
vshl.i64 $t1,$Xl,#57 @ 1st phase
vshl.i64 $t2,$Xl,#62
veor $t2,$t2,$t1 @
vshl.i64 $t1,$Xl,#63
veor $t2, $t2, $t1 @
veor $Xl#hi,$Xl#hi,$t2#lo @
veor $Xh#lo,$Xh#lo,$t2#hi
vshr.u64 $t2,$Xl,#1 @ 2nd phase
veor $Xh,$Xh,$Xl
veor $Xl,$Xl,$t2 @
vshr.u64 $t2,$t2,#6
vshr.u64 $Xl,$Xl,#1 @
veor $Xl,$Xl,$Xh @
veor $Xl,$Xl,$t2 @
subs $len,#16
bne .Loop_neon
#ifdef __ARMEL__
vrev64.8 $Xl,$Xl
#endif
sub $Xi,#16
vst1.64 $Xl#hi,[$Xi]! @ write out Xi
vst1.64 $Xl#lo,[$Xi]
ret @ bx lr
.size gcm_ghash_neon,.-gcm_ghash_neon
#endif
___
}
$code.=<<___;
.asciz "GHASH for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
___
foreach (split("\n",$code)) {
s/\`([^\`]*)\`/eval $1/geo;
s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo or
s/\bret\b/bx lr/go or
s/\bbx\s+lr\b/.word\t0xe12fff1e/go; # make it possible to compile with -march=armv4
print $_,"\n";
}
close STDOUT; # enforce flush
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