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#! /usr/bin/env perl
# Copyright 2016-2020 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/.
# ====================================================================
#
# This module implements Poly1305 hash for PowerPC FPU.
#
# June 2015
#
# Numbers are cycles per processed byte with poly1305_blocks alone,
# and improvement coefficients relative to gcc-generated code.
#
# Freescale e300 9.78/+30%
# PPC74x0 6.92/+50%
# PPC970 6.03/+80%
# POWER7 3.50/+30%
# POWER8 3.75/+10%
# $output is the last argument if it looks like a file (it has an extension)
# $flavour is the first argument if it doesn't look like a file
$output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
$flavour = $#ARGV >= 0 && $ARGV[0] !~ m|\.| ? shift : undef;
if ($flavour =~ /64/) {
$SIZE_T =8;
$LRSAVE =2*$SIZE_T;
$UCMP ="cmpld";
$STU ="stdu";
$POP ="ld";
$PUSH ="std";
} elsif ($flavour =~ /32/) {
$SIZE_T =4;
$LRSAVE =$SIZE_T;
$UCMP ="cmplw";
$STU ="stwu";
$POP ="lwz";
$PUSH ="stw";
} else { die "nonsense $flavour"; }
$LITTLE_ENDIAN = ($flavour=~/le$/) ? 4 : 0;
$LWXLE = $LITTLE_ENDIAN ? "lwzx" : "lwbrx";
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
die "can't locate ppc-xlate.pl";
open STDOUT,"| $^X $xlate $flavour \"$output\""
or die "can't call $xlate: $!";
$LOCALS=6*$SIZE_T;
$FRAME=$LOCALS+6*8+18*8;
my $sp="r1";
my ($ctx,$inp,$len,$padbit) = map("r$_",(3..6));
my ($in0,$in1,$in2,$in3,$i1,$i2,$i3) = map("r$_",(7..12,6));
my ($h0lo,$h0hi,$h1lo,$h1hi,$h2lo,$h2hi,$h3lo,$h3hi,
$two0,$two32,$two64,$two96,$two130,$five_two130,
$r0lo,$r0hi,$r1lo,$r1hi,$r2lo,$r2hi,
$s2lo,$s2hi,$s3lo,$s3hi,
$c0lo,$c0hi,$c1lo,$c1hi,$c2lo,$c2hi,$c3lo,$c3hi) = map("f$_",(0..31));
# borrowings
my ($r3lo,$r3hi,$s1lo,$s1hi) = ($c0lo,$c0hi,$c1lo,$c1hi);
my ($x0,$x1,$x2,$x3) = ($c2lo,$c2hi,$c3lo,$c3hi);
my ($y0,$y1,$y2,$y3) = ($c3lo,$c3hi,$c1lo,$c1hi);
$code.=<<___;
.machine "any"
.text
.globl .poly1305_init_fpu
.align 6
.poly1305_init_fpu:
$STU $sp,-$LOCALS($sp) # minimal frame
mflr $padbit
$PUSH $padbit,`$LOCALS+$LRSAVE`($sp)
bl LPICmeup
xor r0,r0,r0
mtlr $padbit # restore lr
lfd $two0,8*0($len) # load constants
lfd $two32,8*1($len)
lfd $two64,8*2($len)
lfd $two96,8*3($len)
lfd $two130,8*4($len)
lfd $five_two130,8*5($len)
stfd $two0,8*0($ctx) # initial hash value, biased 0
stfd $two32,8*1($ctx)
stfd $two64,8*2($ctx)
stfd $two96,8*3($ctx)
$UCMP $inp,r0
beq- Lno_key
lfd $h3lo,8*13($len) # new fpscr
mffs $h3hi # old fpscr
stfd $two0,8*4($ctx) # key "template"
stfd $two32,8*5($ctx)
stfd $two64,8*6($ctx)
stfd $two96,8*7($ctx)
li $in1,4
li $in2,8
li $in3,12
$LWXLE $in0,0,$inp # load key
$LWXLE $in1,$in1,$inp
$LWXLE $in2,$in2,$inp
$LWXLE $in3,$in3,$inp
lis $i1,0xf000 # 0xf0000000
ori $i2,$i1,3 # 0xf0000003
andc $in0,$in0,$i1 # &=0x0fffffff
andc $in1,$in1,$i2 # &=0x0ffffffc
andc $in2,$in2,$i2
andc $in3,$in3,$i2
stw $in0,`8*4+(4^$LITTLE_ENDIAN)`($ctx) # fill "template"
stw $in1,`8*5+(4^$LITTLE_ENDIAN)`($ctx)
stw $in2,`8*6+(4^$LITTLE_ENDIAN)`($ctx)
stw $in3,`8*7+(4^$LITTLE_ENDIAN)`($ctx)
mtfsf 255,$h3lo # fpscr
stfd $two0,8*18($ctx) # copy constants to context
stfd $two32,8*19($ctx)
stfd $two64,8*20($ctx)
stfd $two96,8*21($ctx)
stfd $two130,8*22($ctx)
stfd $five_two130,8*23($ctx)
lfd $h0lo,8*4($ctx) # load [biased] key
lfd $h1lo,8*5($ctx)
lfd $h2lo,8*6($ctx)
lfd $h3lo,8*7($ctx)
fsub $h0lo,$h0lo,$two0 # r0
fsub $h1lo,$h1lo,$two32 # r1
fsub $h2lo,$h2lo,$two64 # r2
fsub $h3lo,$h3lo,$two96 # r3
lfd $two0,8*6($len) # more constants
lfd $two32,8*7($len)
lfd $two64,8*8($len)
lfd $two96,8*9($len)
fmul $h1hi,$h1lo,$five_two130 # s1
fmul $h2hi,$h2lo,$five_two130 # s2
stfd $h3hi,8*15($ctx) # borrow slot for original fpscr
fmul $h3hi,$h3lo,$five_two130 # s3
fadd $h0hi,$h0lo,$two0
stfd $h1hi,8*12($ctx) # put aside for now
fadd $h1hi,$h1lo,$two32
stfd $h2hi,8*13($ctx)
fadd $h2hi,$h2lo,$two64
stfd $h3hi,8*14($ctx)
fadd $h3hi,$h3lo,$two96
fsub $h0hi,$h0hi,$two0
fsub $h1hi,$h1hi,$two32
fsub $h2hi,$h2hi,$two64
fsub $h3hi,$h3hi,$two96
lfd $two0,8*10($len) # more constants
lfd $two32,8*11($len)
lfd $two64,8*12($len)
fsub $h0lo,$h0lo,$h0hi
fsub $h1lo,$h1lo,$h1hi
fsub $h2lo,$h2lo,$h2hi
fsub $h3lo,$h3lo,$h3hi
stfd $h0hi,8*5($ctx) # r0hi
stfd $h1hi,8*7($ctx) # r1hi
stfd $h2hi,8*9($ctx) # r2hi
stfd $h3hi,8*11($ctx) # r3hi
stfd $h0lo,8*4($ctx) # r0lo
stfd $h1lo,8*6($ctx) # r1lo
stfd $h2lo,8*8($ctx) # r2lo
stfd $h3lo,8*10($ctx) # r3lo
lfd $h1lo,8*12($ctx) # s1
lfd $h2lo,8*13($ctx) # s2
lfd $h3lo,8*14($ctx) # s3
lfd $h0lo,8*15($ctx) # pull original fpscr
fadd $h1hi,$h1lo,$two0
fadd $h2hi,$h2lo,$two32
fadd $h3hi,$h3lo,$two64
fsub $h1hi,$h1hi,$two0
fsub $h2hi,$h2hi,$two32
fsub $h3hi,$h3hi,$two64
fsub $h1lo,$h1lo,$h1hi
fsub $h2lo,$h2lo,$h2hi
fsub $h3lo,$h3lo,$h3hi
stfd $h1hi,8*13($ctx) # s1hi
stfd $h2hi,8*15($ctx) # s2hi
stfd $h3hi,8*17($ctx) # s3hi
stfd $h1lo,8*12($ctx) # s1lo
stfd $h2lo,8*14($ctx) # s2lo
stfd $h3lo,8*16($ctx) # s3lo
mtfsf 255,$h0lo # restore fpscr
Lno_key:
xor r3,r3,r3
addi $sp,$sp,$LOCALS
blr
.long 0
.byte 0,12,4,1,0x80,0,2,0
.size .poly1305_init_fpu,.-.poly1305_init_fpu
.globl .poly1305_blocks_fpu
.align 4
.poly1305_blocks_fpu:
srwi. $len,$len,4
beq- Labort
$STU $sp,-$FRAME($sp)
mflr r0
stfd f14,`$FRAME-8*18`($sp)
stfd f15,`$FRAME-8*17`($sp)
stfd f16,`$FRAME-8*16`($sp)
stfd f17,`$FRAME-8*15`($sp)
stfd f18,`$FRAME-8*14`($sp)
stfd f19,`$FRAME-8*13`($sp)
stfd f20,`$FRAME-8*12`($sp)
stfd f21,`$FRAME-8*11`($sp)
stfd f22,`$FRAME-8*10`($sp)
stfd f23,`$FRAME-8*9`($sp)
stfd f24,`$FRAME-8*8`($sp)
stfd f25,`$FRAME-8*7`($sp)
stfd f26,`$FRAME-8*6`($sp)
stfd f27,`$FRAME-8*5`($sp)
stfd f28,`$FRAME-8*4`($sp)
stfd f29,`$FRAME-8*3`($sp)
stfd f30,`$FRAME-8*2`($sp)
stfd f31,`$FRAME-8*1`($sp)
$PUSH r0,`$FRAME+$LRSAVE`($sp)
xor r0,r0,r0
li $in3,1
mtctr $len
neg $len,$len
stw r0,`$LOCALS+8*4+(0^$LITTLE_ENDIAN)`($sp)
stw $in3,`$LOCALS+8*4+(4^$LITTLE_ENDIAN)`($sp)
lfd $two0,8*18($ctx) # load constants
lfd $two32,8*19($ctx)
lfd $two64,8*20($ctx)
lfd $two96,8*21($ctx)
lfd $two130,8*22($ctx)
lfd $five_two130,8*23($ctx)
lfd $h0lo,8*0($ctx) # load [biased] hash value
lfd $h1lo,8*1($ctx)
lfd $h2lo,8*2($ctx)
lfd $h3lo,8*3($ctx)
stfd $two0,`$LOCALS+8*0`($sp) # input "template"
oris $in3,$padbit,`(1023+52+96)<<4`
stfd $two32,`$LOCALS+8*1`($sp)
stfd $two64,`$LOCALS+8*2`($sp)
stw $in3,`$LOCALS+8*3+(0^$LITTLE_ENDIAN)`($sp)
li $i1,4
li $i2,8
li $i3,12
$LWXLE $in0,0,$inp # load input
$LWXLE $in1,$i1,$inp
$LWXLE $in2,$i2,$inp
$LWXLE $in3,$i3,$inp
addi $inp,$inp,16
stw $in0,`$LOCALS+8*0+(4^$LITTLE_ENDIAN)`($sp) # fill "template"
stw $in1,`$LOCALS+8*1+(4^$LITTLE_ENDIAN)`($sp)
stw $in2,`$LOCALS+8*2+(4^$LITTLE_ENDIAN)`($sp)
stw $in3,`$LOCALS+8*3+(4^$LITTLE_ENDIAN)`($sp)
mffs $x0 # original fpscr
lfd $x1,`$LOCALS+8*4`($sp) # new fpscr
lfd $r0lo,8*4($ctx) # load key
lfd $r0hi,8*5($ctx)
lfd $r1lo,8*6($ctx)
lfd $r1hi,8*7($ctx)
lfd $r2lo,8*8($ctx)
lfd $r2hi,8*9($ctx)
lfd $r3lo,8*10($ctx)
lfd $r3hi,8*11($ctx)
lfd $s1lo,8*12($ctx)
lfd $s1hi,8*13($ctx)
lfd $s2lo,8*14($ctx)
lfd $s2hi,8*15($ctx)
lfd $s3lo,8*16($ctx)
lfd $s3hi,8*17($ctx)
stfd $x0,`$LOCALS+8*4`($sp) # save original fpscr
mtfsf 255,$x1
addic $len,$len,1
addze r0,r0
slwi. r0,r0,4
sub $inp,$inp,r0 # conditional rewind
lfd $x0,`$LOCALS+8*0`($sp)
lfd $x1,`$LOCALS+8*1`($sp)
lfd $x2,`$LOCALS+8*2`($sp)
lfd $x3,`$LOCALS+8*3`($sp)
fsub $h0lo,$h0lo,$two0 # de-bias hash value
$LWXLE $in0,0,$inp # modulo-scheduled input load
fsub $h1lo,$h1lo,$two32
$LWXLE $in1,$i1,$inp
fsub $h2lo,$h2lo,$two64
$LWXLE $in2,$i2,$inp
fsub $h3lo,$h3lo,$two96
$LWXLE $in3,$i3,$inp
fsub $x0,$x0,$two0 # de-bias input
addi $inp,$inp,16
fsub $x1,$x1,$two32
fsub $x2,$x2,$two64
fsub $x3,$x3,$two96
fadd $x0,$x0,$h0lo # accumulate input
stw $in0,`$LOCALS+8*0+(4^$LITTLE_ENDIAN)`($sp)
fadd $x1,$x1,$h1lo
stw $in1,`$LOCALS+8*1+(4^$LITTLE_ENDIAN)`($sp)
fadd $x2,$x2,$h2lo
stw $in2,`$LOCALS+8*2+(4^$LITTLE_ENDIAN)`($sp)
fadd $x3,$x3,$h3lo
stw $in3,`$LOCALS+8*3+(4^$LITTLE_ENDIAN)`($sp)
b Lentry
.align 4
Loop:
fsub $y0,$y0,$two0 # de-bias input
addic $len,$len,1
fsub $y1,$y1,$two32
addze r0,r0
fsub $y2,$y2,$two64
slwi. r0,r0,4
fsub $y3,$y3,$two96
sub $inp,$inp,r0 # conditional rewind
fadd $h0lo,$h0lo,$y0 # accumulate input
fadd $h0hi,$h0hi,$y1
fadd $h2lo,$h2lo,$y2
fadd $h2hi,$h2hi,$y3
######################################### base 2^48 -> base 2^32
fadd $c1lo,$h1lo,$two64
$LWXLE $in0,0,$inp # modulo-scheduled input load
fadd $c1hi,$h1hi,$two64
$LWXLE $in1,$i1,$inp
fadd $c3lo,$h3lo,$two130
$LWXLE $in2,$i2,$inp
fadd $c3hi,$h3hi,$two130
$LWXLE $in3,$i3,$inp
fadd $c0lo,$h0lo,$two32
addi $inp,$inp,16
fadd $c0hi,$h0hi,$two32
fadd $c2lo,$h2lo,$two96
fadd $c2hi,$h2hi,$two96
fsub $c1lo,$c1lo,$two64
stw $in0,`$LOCALS+8*0+(4^$LITTLE_ENDIAN)`($sp) # fill "template"
fsub $c1hi,$c1hi,$two64
stw $in1,`$LOCALS+8*1+(4^$LITTLE_ENDIAN)`($sp)
fsub $c3lo,$c3lo,$two130
stw $in2,`$LOCALS+8*2+(4^$LITTLE_ENDIAN)`($sp)
fsub $c3hi,$c3hi,$two130
stw $in3,`$LOCALS+8*3+(4^$LITTLE_ENDIAN)`($sp)
fsub $c0lo,$c0lo,$two32
fsub $c0hi,$c0hi,$two32
fsub $c2lo,$c2lo,$two96
fsub $c2hi,$c2hi,$two96
fsub $h1lo,$h1lo,$c1lo
fsub $h1hi,$h1hi,$c1hi
fsub $h3lo,$h3lo,$c3lo
fsub $h3hi,$h3hi,$c3hi
fsub $h2lo,$h2lo,$c2lo
fsub $h2hi,$h2hi,$c2hi
fsub $h0lo,$h0lo,$c0lo
fsub $h0hi,$h0hi,$c0hi
fadd $h1lo,$h1lo,$c0lo
fadd $h1hi,$h1hi,$c0hi
fadd $h3lo,$h3lo,$c2lo
fadd $h3hi,$h3hi,$c2hi
fadd $h2lo,$h2lo,$c1lo
fadd $h2hi,$h2hi,$c1hi
fmadd $h0lo,$c3lo,$five_two130,$h0lo
fmadd $h0hi,$c3hi,$five_two130,$h0hi
fadd $x1,$h1lo,$h1hi
lfd $s1lo,8*12($ctx) # reload constants
fadd $x3,$h3lo,$h3hi
lfd $s1hi,8*13($ctx)
fadd $x2,$h2lo,$h2hi
lfd $r3lo,8*10($ctx)
fadd $x0,$h0lo,$h0hi
lfd $r3hi,8*11($ctx)
Lentry:
fmul $h0lo,$s3lo,$x1
fmul $h0hi,$s3hi,$x1
fmul $h2lo,$r1lo,$x1
fmul $h2hi,$r1hi,$x1
fmul $h1lo,$r0lo,$x1
fmul $h1hi,$r0hi,$x1
fmul $h3lo,$r2lo,$x1
fmul $h3hi,$r2hi,$x1
fmadd $h0lo,$s1lo,$x3,$h0lo
fmadd $h0hi,$s1hi,$x3,$h0hi
fmadd $h2lo,$s3lo,$x3,$h2lo
fmadd $h2hi,$s3hi,$x3,$h2hi
fmadd $h1lo,$s2lo,$x3,$h1lo
fmadd $h1hi,$s2hi,$x3,$h1hi
fmadd $h3lo,$r0lo,$x3,$h3lo
fmadd $h3hi,$r0hi,$x3,$h3hi
fmadd $h0lo,$s2lo,$x2,$h0lo
fmadd $h0hi,$s2hi,$x2,$h0hi
fmadd $h2lo,$r0lo,$x2,$h2lo
fmadd $h2hi,$r0hi,$x2,$h2hi
fmadd $h1lo,$s3lo,$x2,$h1lo
fmadd $h1hi,$s3hi,$x2,$h1hi
fmadd $h3lo,$r1lo,$x2,$h3lo
fmadd $h3hi,$r1hi,$x2,$h3hi
fmadd $h0lo,$r0lo,$x0,$h0lo
lfd $y0,`$LOCALS+8*0`($sp) # load [biased] input
fmadd $h0hi,$r0hi,$x0,$h0hi
lfd $y1,`$LOCALS+8*1`($sp)
fmadd $h2lo,$r2lo,$x0,$h2lo
lfd $y2,`$LOCALS+8*2`($sp)
fmadd $h2hi,$r2hi,$x0,$h2hi
lfd $y3,`$LOCALS+8*3`($sp)
fmadd $h1lo,$r1lo,$x0,$h1lo
fmadd $h1hi,$r1hi,$x0,$h1hi
fmadd $h3lo,$r3lo,$x0,$h3lo
fmadd $h3hi,$r3hi,$x0,$h3hi
bdnz Loop
######################################### base 2^48 -> base 2^32
fadd $c0lo,$h0lo,$two32
fadd $c0hi,$h0hi,$two32
fadd $c2lo,$h2lo,$two96
fadd $c2hi,$h2hi,$two96
fadd $c1lo,$h1lo,$two64
fadd $c1hi,$h1hi,$two64
fadd $c3lo,$h3lo,$two130
fadd $c3hi,$h3hi,$two130
fsub $c0lo,$c0lo,$two32
fsub $c0hi,$c0hi,$two32
fsub $c2lo,$c2lo,$two96
fsub $c2hi,$c2hi,$two96
fsub $c1lo,$c1lo,$two64
fsub $c1hi,$c1hi,$two64
fsub $c3lo,$c3lo,$two130
fsub $c3hi,$c3hi,$two130
fsub $h1lo,$h1lo,$c1lo
fsub $h1hi,$h1hi,$c1hi
fsub $h3lo,$h3lo,$c3lo
fsub $h3hi,$h3hi,$c3hi
fsub $h2lo,$h2lo,$c2lo
fsub $h2hi,$h2hi,$c2hi
fsub $h0lo,$h0lo,$c0lo
fsub $h0hi,$h0hi,$c0hi
fadd $h1lo,$h1lo,$c0lo
fadd $h1hi,$h1hi,$c0hi
fadd $h3lo,$h3lo,$c2lo
fadd $h3hi,$h3hi,$c2hi
fadd $h2lo,$h2lo,$c1lo
fadd $h2hi,$h2hi,$c1hi
fmadd $h0lo,$c3lo,$five_two130,$h0lo
fmadd $h0hi,$c3hi,$five_two130,$h0hi
fadd $x1,$h1lo,$h1hi
fadd $x3,$h3lo,$h3hi
fadd $x2,$h2lo,$h2hi
fadd $x0,$h0lo,$h0hi
lfd $h0lo,`$LOCALS+8*4`($sp) # pull saved fpscr
fadd $x1,$x1,$two32 # bias
fadd $x3,$x3,$two96
fadd $x2,$x2,$two64
fadd $x0,$x0,$two0
stfd $x1,8*1($ctx) # store [biased] hash value
stfd $x3,8*3($ctx)
stfd $x2,8*2($ctx)
stfd $x0,8*0($ctx)
mtfsf 255,$h0lo # restore original fpscr
lfd f14,`$FRAME-8*18`($sp)
lfd f15,`$FRAME-8*17`($sp)
lfd f16,`$FRAME-8*16`($sp)
lfd f17,`$FRAME-8*15`($sp)
lfd f18,`$FRAME-8*14`($sp)
lfd f19,`$FRAME-8*13`($sp)
lfd f20,`$FRAME-8*12`($sp)
lfd f21,`$FRAME-8*11`($sp)
lfd f22,`$FRAME-8*10`($sp)
lfd f23,`$FRAME-8*9`($sp)
lfd f24,`$FRAME-8*8`($sp)
lfd f25,`$FRAME-8*7`($sp)
lfd f26,`$FRAME-8*6`($sp)
lfd f27,`$FRAME-8*5`($sp)
lfd f28,`$FRAME-8*4`($sp)
lfd f29,`$FRAME-8*3`($sp)
lfd f30,`$FRAME-8*2`($sp)
lfd f31,`$FRAME-8*1`($sp)
addi $sp,$sp,$FRAME
Labort:
blr
.long 0
.byte 0,12,4,1,0x80,0,4,0
.size .poly1305_blocks_fpu,.-.poly1305_blocks_fpu
___
{
my ($mac,$nonce)=($inp,$len);
my ($h0,$h1,$h2,$h3,$h4, $d0,$d1,$d2,$d3
) = map("r$_",(7..11,28..31));
my $mask = "r0";
my $FRAME = (6+4)*$SIZE_T;
$code.=<<___;
.globl .poly1305_emit_fpu
.align 4
.poly1305_emit_fpu:
$STU $sp,-$FRAME($sp)
mflr r0
$PUSH r28,`$FRAME-$SIZE_T*4`($sp)
$PUSH r29,`$FRAME-$SIZE_T*3`($sp)
$PUSH r30,`$FRAME-$SIZE_T*2`($sp)
$PUSH r31,`$FRAME-$SIZE_T*1`($sp)
$PUSH r0,`$FRAME+$LRSAVE`($sp)
lwz $d0,`8*0+(0^$LITTLE_ENDIAN)`($ctx) # load hash
lwz $h0,`8*0+(4^$LITTLE_ENDIAN)`($ctx)
lwz $d1,`8*1+(0^$LITTLE_ENDIAN)`($ctx)
lwz $h1,`8*1+(4^$LITTLE_ENDIAN)`($ctx)
lwz $d2,`8*2+(0^$LITTLE_ENDIAN)`($ctx)
lwz $h2,`8*2+(4^$LITTLE_ENDIAN)`($ctx)
lwz $d3,`8*3+(0^$LITTLE_ENDIAN)`($ctx)
lwz $h3,`8*3+(4^$LITTLE_ENDIAN)`($ctx)
lis $mask,0xfff0
andc $d0,$d0,$mask # mask exponent
andc $d1,$d1,$mask
andc $d2,$d2,$mask
andc $d3,$d3,$mask # can be partially reduced...
li $mask,3
srwi $padbit,$d3,2 # ... so reduce
and $h4,$d3,$mask
andc $d3,$d3,$mask
add $d3,$d3,$padbit
___
if ($SIZE_T==4) {
$code.=<<___;
addc $h0,$h0,$d3
adde $h1,$h1,$d0
adde $h2,$h2,$d1
adde $h3,$h3,$d2
addze $h4,$h4
addic $d0,$h0,5 # compare to modulus
addze $d1,$h1
addze $d2,$h2
addze $d3,$h3
addze $mask,$h4
srwi $mask,$mask,2 # did it carry/borrow?
neg $mask,$mask
srawi $mask,$mask,31 # mask
andc $h0,$h0,$mask
and $d0,$d0,$mask
andc $h1,$h1,$mask
and $d1,$d1,$mask
or $h0,$h0,$d0
lwz $d0,0($nonce) # load nonce
andc $h2,$h2,$mask
and $d2,$d2,$mask
or $h1,$h1,$d1
lwz $d1,4($nonce)
andc $h3,$h3,$mask
and $d3,$d3,$mask
or $h2,$h2,$d2
lwz $d2,8($nonce)
or $h3,$h3,$d3
lwz $d3,12($nonce)
addc $h0,$h0,$d0 # accumulate nonce
adde $h1,$h1,$d1
adde $h2,$h2,$d2
adde $h3,$h3,$d3
___
} else {
$code.=<<___;
add $h0,$h0,$d3
add $h1,$h1,$d0
add $h2,$h2,$d1
add $h3,$h3,$d2
srdi $d0,$h0,32
add $h1,$h1,$d0
srdi $d1,$h1,32
add $h2,$h2,$d1
srdi $d2,$h2,32
add $h3,$h3,$d2
srdi $d3,$h3,32
add $h4,$h4,$d3
insrdi $h0,$h1,32,0
insrdi $h2,$h3,32,0
addic $d0,$h0,5 # compare to modulus
addze $d1,$h2
addze $d2,$h4
srdi $mask,$d2,2 # did it carry/borrow?
neg $mask,$mask
sradi $mask,$mask,63 # mask
ld $d2,0($nonce) # load nonce
ld $d3,8($nonce)
andc $h0,$h0,$mask
and $d0,$d0,$mask
andc $h2,$h2,$mask
and $d1,$d1,$mask
or $h0,$h0,$d0
or $h2,$h2,$d1
___
$code.=<<___ if (!$LITTLE_ENDIAN);
rotldi $d2,$d2,32 # flip nonce words
rotldi $d3,$d3,32
___
$code.=<<___;
addc $h0,$h0,$d2 # accumulate nonce
adde $h2,$h2,$d3
srdi $h1,$h0,32
srdi $h3,$h2,32
___
}
$code.=<<___ if ($LITTLE_ENDIAN);
stw $h0,0($mac) # write result
stw $h1,4($mac)
stw $h2,8($mac)
stw $h3,12($mac)
___
$code.=<<___ if (!$LITTLE_ENDIAN);
li $d1,4
stwbrx $h0,0,$mac # write result
li $d2,8
stwbrx $h1,$d1,$mac
li $d3,12
stwbrx $h2,$d2,$mac
stwbrx $h3,$d3,$mac
___
$code.=<<___;
$POP r28,`$FRAME-$SIZE_T*4`($sp)
$POP r29,`$FRAME-$SIZE_T*3`($sp)
$POP r30,`$FRAME-$SIZE_T*2`($sp)
$POP r31,`$FRAME-$SIZE_T*1`($sp)
addi $sp,$sp,$FRAME
blr
.long 0
.byte 0,12,4,1,0x80,4,3,0
.size .poly1305_emit_fpu,.-.poly1305_emit_fpu
___
}
# Ugly hack here, because PPC assembler syntax seem to vary too
# much from platforms to platform...
$code.=<<___;
.align 6
LPICmeup:
mflr r0
bcl 20,31,\$+4
mflr $len # vvvvvv "distance" between . and 1st data entry
addi $len,$len,`64-8` # borrow $len
mtlr r0
blr
.long 0
.byte 0,12,0x14,0,0,0,0,0
.space `64-9*4`
.quad 0x4330000000000000 # 2^(52+0)
.quad 0x4530000000000000 # 2^(52+32)
.quad 0x4730000000000000 # 2^(52+64)
.quad 0x4930000000000000 # 2^(52+96)
.quad 0x4b50000000000000 # 2^(52+130)
.quad 0x37f4000000000000 # 5/2^130
.quad 0x4430000000000000 # 2^(52+16+0)
.quad 0x4630000000000000 # 2^(52+16+32)
.quad 0x4830000000000000 # 2^(52+16+64)
.quad 0x4a30000000000000 # 2^(52+16+96)
.quad 0x3e30000000000000 # 2^(52+16+0-96)
.quad 0x4030000000000000 # 2^(52+16+32-96)
.quad 0x4230000000000000 # 2^(52+16+64-96)
.quad 0x0000000000000001 # fpscr: truncate, no exceptions
.asciz "Poly1305 for PPC FPU, CRYPTOGAMS by <appro\@openssl.org>"
.align 4
___
$code =~ s/\`([^\`]*)\`/eval $1/gem;
print $code;
close STDOUT or die "error closing STDOUT: $!";
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