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CloverBootloader/Library/OpensslLib/openssl/crypto/chacha/asm/chacha-c64xplus.pl

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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/.
# ====================================================================
#
# ChaCha20 for C64x+.
#
# October 2015
#
# Performance is 3.54 cycles per processed byte, which is ~4.3 times
# faster than code generated by TI compiler. Compiler also disables
# interrupts for some reason, thus making interrupt response time
# dependent on input length. This module on the other hand is free
# from such limitation.
$output=pop and open STDOUT,">$output";
($OUT,$INP,$LEN,$KEYB,$COUNTERA)=("A4","B4","A6","B6","A8");
($KEYA,$COUNTERB,$STEP)=("A7","B7","A3");
@X= ("A16","B16","A17","B17","A18","B18","A19","B19",
"A20","B20","A21","B21","A22","B22","A23","B23");
@Y= ("A24","B24","A25","B25","A26","B26","A27","B27",
"A28","B28","A29","B29","A30","B30","A31","B31");
@DAT=("A6", "A7", "B6", "B7", "A8", "A9", "B8", "B9",
"A10","A11","B10","B11","A12","A13","B12","B13");
# yes, overlaps with @DAT, used only in 2x interleave code path...
@K2x=("A6", "B6", "A7", "B7", "A8", "B8", "A9", "B9",
"A10","B10","A11","B11","A2", "B2", "A13","B13");
$code.=<<___;
.text
.if .ASSEMBLER_VERSION<7000000
.asg 0,__TI_EABI__
.endif
.if __TI_EABI__
.asg ChaCha20_ctr32,_ChaCha20_ctr32
.endif
.asg B3,RA
.asg A15,FP
.asg B15,SP
.global _ChaCha20_ctr32
.align 32
_ChaCha20_ctr32:
.asmfunc stack_usage(40+64)
MV $LEN,A0 ; reassign
[!A0] BNOP RA ; no data
|| [A0] STW FP,*SP--(40+64) ; save frame pointer and alloca(40+64)
|| [A0] MV SP,FP
[A0] STDW B13:B12,*SP[4+8] ; ABI says so
|| [A0] MV $KEYB,$KEYA
|| [A0] MV $COUNTERA,$COUNTERB
[A0] STDW B11:B10,*SP[3+8]
|| [A0] STDW A13:A12,*FP[-3]
[A0] STDW A11:A10,*FP[-4]
|| [A0] MVK 128,$STEP ; 2 * input block size
[A0] LDW *${KEYA}[0],@Y[4] ; load key
|| [A0] LDW *${KEYB}[1],@Y[5]
|| [A0] MVK 0x00007865,@Y[0] ; synthesize sigma
|| [A0] MVK 0x0000646e,@Y[1]
[A0] LDW *${KEYA}[2],@Y[6]
|| [A0] LDW *${KEYB}[3],@Y[7]
|| [A0] MVKH 0x61700000,@Y[0]
|| [A0] MVKH 0x33200000,@Y[1]
LDW *${KEYA}[4],@Y[8]
|| LDW *${KEYB}[5],@Y[9]
|| MVK 0x00002d32,@Y[2]
|| MVK 0x00006574,@Y[3]
LDW *${KEYA}[6],@Y[10]
|| LDW *${KEYB}[7],@Y[11]
|| MVKH 0x79620000,@Y[2]
|| MVKH 0x6b200000,@Y[3]
LDW *${COUNTERA}[0],@Y[12] ; load counter||nonce
|| LDW *${COUNTERB}[1],@Y[13]
|| CMPLTU A0,$STEP,A1 ; is length < 2*blocks?
LDW *${COUNTERA}[2],@Y[14]
|| LDW *${COUNTERB}[3],@Y[15]
|| [A1] BNOP top1x?
[A1] MVK 64,$STEP ; input block size
|| MVK 10,B0 ; inner loop counter
DMV @Y[2],@Y[0],@X[2]:@X[0] ; copy block
|| DMV @Y[3],@Y[1],@X[3]:@X[1]
||[!A1] STDW @Y[2]:@Y[0],*FP[-12] ; offload key material to stack
||[!A1] STDW @Y[3]:@Y[1],*SP[2]
DMV @Y[6],@Y[4],@X[6]:@X[4]
|| DMV @Y[7],@Y[5],@X[7]:@X[5]
||[!A1] STDW @Y[6]:@Y[4],*FP[-10]
||[!A1] STDW @Y[7]:@Y[5],*SP[4]
DMV @Y[10],@Y[8],@X[10]:@X[8]
|| DMV @Y[11],@Y[9],@X[11]:@X[9]
||[!A1] STDW @Y[10]:@Y[8],*FP[-8]
||[!A1] STDW @Y[11]:@Y[9],*SP[6]
DMV @Y[14],@Y[12],@X[14]:@X[12]
|| DMV @Y[15],@Y[13],@X[15]:@X[13]
||[!A1] MV @Y[12],@K2x[12] ; counter
||[!A1] MV @Y[13],@K2x[13]
||[!A1] STW @Y[14],*FP[-6*2]
||[!A1] STW @Y[15],*SP[8*2]
___
{ ################################################################
# 2x interleave gives 50% performance improvement
#
my ($a0,$a1,$a2,$a3) = (0..3);
my ($b0,$b1,$b2,$b3) = (4..7);
my ($c0,$c1,$c2,$c3) = (8..11);
my ($d0,$d1,$d2,$d3) = (12..15);
$code.=<<___;
outer2x?:
ADD @X[$b1],@X[$a1],@X[$a1]
|| ADD @X[$b2],@X[$a2],@X[$a2]
|| ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| DMV @Y[2],@Y[0],@K2x[2]:@K2x[0]
|| DMV @Y[3],@Y[1],@K2x[3]:@K2x[1]
XOR @X[$a1],@X[$d1],@X[$d1]
|| XOR @X[$a2],@X[$d2],@X[$d2]
|| XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| DMV @Y[6],@Y[4],@K2x[6]:@K2x[4]
|| DMV @Y[7],@Y[5],@K2x[7]:@K2x[5]
SWAP2 @X[$d1],@X[$d1] ; rotate by 16
|| SWAP2 @X[$d2],@X[$d2]
|| SWAP2 @X[$d0],@X[$d0]
|| SWAP2 @X[$d3],@X[$d3]
ADD @X[$d1],@X[$c1],@X[$c1]
|| ADD @X[$d2],@X[$c2],@X[$c2]
|| ADD @X[$d0],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c3],@X[$c3]
|| DMV @Y[10],@Y[8],@K2x[10]:@K2x[8]
|| DMV @Y[11],@Y[9],@K2x[11]:@K2x[9]
XOR @X[$c1],@X[$b1],@X[$b1]
|| XOR @X[$c2],@X[$b2],@X[$b2]
|| XOR @X[$c0],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b3],@X[$b3]
|| ADD 1,@Y[12],@Y[12] ; adjust counter for 2nd block
ROTL @X[$b1],12,@X[$b1]
|| ROTL @X[$b2],12,@X[$b2]
|| MV @Y[14],@K2x[14]
|| MV @Y[15],@K2x[15]
top2x?:
ROTL @X[$b0],12,@X[$b0]
|| ROTL @X[$b3],12,@X[$b3]
|| ADD @Y[$b1],@Y[$a1],@Y[$a1]
|| ADD @Y[$b2],@Y[$a2],@Y[$a2]
ADD @Y[$b0],@Y[$a0],@Y[$a0]
|| ADD @Y[$b3],@Y[$a3],@Y[$a3]
|| ADD @X[$b1],@X[$a1],@X[$a1]
|| ADD @X[$b2],@X[$a2],@X[$a2]
|| XOR @Y[$a1],@Y[$d1],@Y[$d1]
|| XOR @Y[$a2],@Y[$d2],@Y[$d2]
XOR @Y[$a0],@Y[$d0],@Y[$d0]
|| XOR @Y[$a3],@Y[$d3],@Y[$d3]
|| ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a1],@X[$d1],@X[$d1]
|| XOR @X[$a2],@X[$d2],@X[$d2]
XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| ROTL @X[$d1],8,@X[$d1]
|| ROTL @X[$d2],8,@X[$d2]
|| SWAP2 @Y[$d1],@Y[$d1] ; rotate by 16
|| SWAP2 @Y[$d2],@Y[$d2]
|| SWAP2 @Y[$d0],@Y[$d0]
|| SWAP2 @Y[$d3],@Y[$d3]
ROTL @X[$d0],8,@X[$d0]
|| ROTL @X[$d3],8,@X[$d3]
|| ADD @Y[$d1],@Y[$c1],@Y[$c1]
|| ADD @Y[$d2],@Y[$c2],@Y[$c2]
|| ADD @Y[$d0],@Y[$c0],@Y[$c0]
|| ADD @Y[$d3],@Y[$c3],@Y[$c3]
|| BNOP middle2x1? ; protect from interrupt
ADD @X[$d1],@X[$c1],@X[$c1]
|| ADD @X[$d2],@X[$c2],@X[$c2]
|| XOR @Y[$c1],@Y[$b1],@Y[$b1]
|| XOR @Y[$c2],@Y[$b2],@Y[$b2]
|| XOR @Y[$c0],@Y[$b0],@Y[$b0]
|| XOR @Y[$c3],@Y[$b3],@Y[$b3]
ADD @X[$d0],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c3],@X[$c3]
|| XOR @X[$c1],@X[$b1],@X[$b1]
|| XOR @X[$c2],@X[$b2],@X[$b2]
|| ROTL @X[$d1],0,@X[$d2] ; moved to avoid cross-path stall
|| ROTL @X[$d2],0,@X[$d3]
XOR @X[$c0],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b3],@X[$b3]
|| MV @X[$d0],@X[$d1]
|| MV @X[$d3],@X[$d0]
|| ROTL @Y[$b1],12,@Y[$b1]
|| ROTL @Y[$b2],12,@Y[$b2]
ROTL @X[$b1],7,@X[$b0] ; avoided cross-path stall
|| ROTL @X[$b2],7,@X[$b1]
ROTL @X[$b0],7,@X[$b3]
|| ROTL @X[$b3],7,@X[$b2]
middle2x1?:
ROTL @Y[$b0],12,@Y[$b0]
|| ROTL @Y[$b3],12,@Y[$b3]
|| ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b1],@X[$a1],@X[$a1]
ADD @X[$b2],@X[$a2],@X[$a2]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| ADD @Y[$b1],@Y[$a1],@Y[$a1]
|| ADD @Y[$b2],@Y[$a2],@Y[$a2]
|| XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a1],@X[$d1],@X[$d1]
XOR @X[$a2],@X[$d2],@X[$d2]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| ADD @Y[$b0],@Y[$a0],@Y[$a0]
|| ADD @Y[$b3],@Y[$a3],@Y[$a3]
|| XOR @Y[$a1],@Y[$d1],@Y[$d1]
|| XOR @Y[$a2],@Y[$d2],@Y[$d2]
XOR @Y[$a0],@Y[$d0],@Y[$d0]
|| XOR @Y[$a3],@Y[$d3],@Y[$d3]
|| ROTL @Y[$d1],8,@Y[$d1]
|| ROTL @Y[$d2],8,@Y[$d2]
|| SWAP2 @X[$d0],@X[$d0] ; rotate by 16
|| SWAP2 @X[$d1],@X[$d1]
|| SWAP2 @X[$d2],@X[$d2]
|| SWAP2 @X[$d3],@X[$d3]
ROTL @Y[$d0],8,@Y[$d0]
|| ROTL @Y[$d3],8,@Y[$d3]
|| ADD @X[$d0],@X[$c2],@X[$c2]
|| ADD @X[$d1],@X[$c3],@X[$c3]
|| ADD @X[$d2],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c1],@X[$c1]
|| BNOP middle2x2? ; protect from interrupt
ADD @Y[$d1],@Y[$c1],@Y[$c1]
|| ADD @Y[$d2],@Y[$c2],@Y[$c2]
|| XOR @X[$c2],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b1],@X[$b1]
|| XOR @X[$c0],@X[$b2],@X[$b2]
|| XOR @X[$c1],@X[$b3],@X[$b3]
ADD @Y[$d0],@Y[$c0],@Y[$c0]
|| ADD @Y[$d3],@Y[$c3],@Y[$c3]
|| XOR @Y[$c1],@Y[$b1],@Y[$b1]
|| XOR @Y[$c2],@Y[$b2],@Y[$b2]
|| ROTL @Y[$d1],0,@Y[$d2] ; moved to avoid cross-path stall
|| ROTL @Y[$d2],0,@Y[$d3]
XOR @Y[$c0],@Y[$b0],@Y[$b0]
|| XOR @Y[$c3],@Y[$b3],@Y[$b3]
|| MV @Y[$d0],@Y[$d1]
|| MV @Y[$d3],@Y[$d0]
|| ROTL @X[$b0],12,@X[$b0]
|| ROTL @X[$b1],12,@X[$b1]
ROTL @Y[$b1],7,@Y[$b0] ; avoided cross-path stall
|| ROTL @Y[$b2],7,@Y[$b1]
ROTL @Y[$b0],7,@Y[$b3]
|| ROTL @Y[$b3],7,@Y[$b2]
middle2x2?:
ROTL @X[$b2],12,@X[$b2]
|| ROTL @X[$b3],12,@X[$b3]
|| ADD @Y[$b0],@Y[$a0],@Y[$a0]
|| ADD @Y[$b1],@Y[$a1],@Y[$a1]
ADD @Y[$b2],@Y[$a2],@Y[$a2]
|| ADD @Y[$b3],@Y[$a3],@Y[$a3]
|| ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b1],@X[$a1],@X[$a1]
|| XOR @Y[$a0],@Y[$d0],@Y[$d0]
|| XOR @Y[$a1],@Y[$d1],@Y[$d1]
XOR @Y[$a2],@Y[$d2],@Y[$d2]
|| XOR @Y[$a3],@Y[$d3],@Y[$d3]
|| ADD @X[$b2],@X[$a2],@X[$a2]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a1],@X[$d1],@X[$d1]
XOR @X[$a2],@X[$d2],@X[$d2]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| ROTL @X[$d0],8,@X[$d0]
|| ROTL @X[$d1],8,@X[$d1]
|| SWAP2 @Y[$d0],@Y[$d0] ; rotate by 16
|| SWAP2 @Y[$d1],@Y[$d1]
|| SWAP2 @Y[$d2],@Y[$d2]
|| SWAP2 @Y[$d3],@Y[$d3]
ROTL @X[$d2],8,@X[$d2]
|| ROTL @X[$d3],8,@X[$d3]
|| ADD @Y[$d0],@Y[$c2],@Y[$c2]
|| ADD @Y[$d1],@Y[$c3],@Y[$c3]
|| ADD @Y[$d2],@Y[$c0],@Y[$c0]
|| ADD @Y[$d3],@Y[$c1],@Y[$c1]
|| BNOP bottom2x1? ; protect from interrupt
ADD @X[$d0],@X[$c2],@X[$c2]
|| ADD @X[$d1],@X[$c3],@X[$c3]
|| XOR @Y[$c2],@Y[$b0],@Y[$b0]
|| XOR @Y[$c3],@Y[$b1],@Y[$b1]
|| XOR @Y[$c0],@Y[$b2],@Y[$b2]
|| XOR @Y[$c1],@Y[$b3],@Y[$b3]
ADD @X[$d2],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c1],@X[$c1]
|| XOR @X[$c2],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b1],@X[$b1]
|| ROTL @X[$d0],0,@X[$d3] ; moved to avoid cross-path stall
|| ROTL @X[$d1],0,@X[$d0]
XOR @X[$c0],@X[$b2],@X[$b2]
|| XOR @X[$c1],@X[$b3],@X[$b3]
|| MV @X[$d2],@X[$d1]
|| MV @X[$d3],@X[$d2]
|| ROTL @Y[$b0],12,@Y[$b0]
|| ROTL @Y[$b1],12,@Y[$b1]
ROTL @X[$b0],7,@X[$b1] ; avoided cross-path stall
|| ROTL @X[$b1],7,@X[$b2]
ROTL @X[$b2],7,@X[$b3]
|| ROTL @X[$b3],7,@X[$b0]
|| [B0] SUB B0,1,B0 ; decrement inner loop counter
bottom2x1?:
ROTL @Y[$b2],12,@Y[$b2]
|| ROTL @Y[$b3],12,@Y[$b3]
|| [B0] ADD @X[$b1],@X[$a1],@X[$a1] ; modulo-scheduled
|| [B0] ADD @X[$b2],@X[$a2],@X[$a2]
[B0] ADD @X[$b0],@X[$a0],@X[$a0]
|| [B0] ADD @X[$b3],@X[$a3],@X[$a3]
|| ADD @Y[$b0],@Y[$a0],@Y[$a0]
|| ADD @Y[$b1],@Y[$a1],@Y[$a1]
|| [B0] XOR @X[$a1],@X[$d1],@X[$d1]
|| [B0] XOR @X[$a2],@X[$d2],@X[$d2]
[B0] XOR @X[$a0],@X[$d0],@X[$d0]
|| [B0] XOR @X[$a3],@X[$d3],@X[$d3]
|| ADD @Y[$b2],@Y[$a2],@Y[$a2]
|| ADD @Y[$b3],@Y[$a3],@Y[$a3]
|| XOR @Y[$a0],@Y[$d0],@Y[$d0]
|| XOR @Y[$a1],@Y[$d1],@Y[$d1]
XOR @Y[$a2],@Y[$d2],@Y[$d2]
|| XOR @Y[$a3],@Y[$d3],@Y[$d3]
|| ROTL @Y[$d0],8,@Y[$d0]
|| ROTL @Y[$d1],8,@Y[$d1]
|| [B0] SWAP2 @X[$d1],@X[$d1] ; rotate by 16
|| [B0] SWAP2 @X[$d2],@X[$d2]
|| [B0] SWAP2 @X[$d0],@X[$d0]
|| [B0] SWAP2 @X[$d3],@X[$d3]
ROTL @Y[$d2],8,@Y[$d2]
|| ROTL @Y[$d3],8,@Y[$d3]
|| [B0] ADD @X[$d1],@X[$c1],@X[$c1]
|| [B0] ADD @X[$d2],@X[$c2],@X[$c2]
|| [B0] ADD @X[$d0],@X[$c0],@X[$c0]
|| [B0] ADD @X[$d3],@X[$c3],@X[$c3]
|| [B0] BNOP top2x? ; even protects from interrupt
ADD @Y[$d0],@Y[$c2],@Y[$c2]
|| ADD @Y[$d1],@Y[$c3],@Y[$c3]
|| [B0] XOR @X[$c1],@X[$b1],@X[$b1]
|| [B0] XOR @X[$c2],@X[$b2],@X[$b2]
|| [B0] XOR @X[$c0],@X[$b0],@X[$b0]
|| [B0] XOR @X[$c3],@X[$b3],@X[$b3]
ADD @Y[$d2],@Y[$c0],@Y[$c0]
|| ADD @Y[$d3],@Y[$c1],@Y[$c1]
|| XOR @Y[$c2],@Y[$b0],@Y[$b0]
|| XOR @Y[$c3],@Y[$b1],@Y[$b1]
|| ROTL @Y[$d0],0,@Y[$d3] ; moved to avoid cross-path stall
|| ROTL @Y[$d1],0,@Y[$d0]
XOR @Y[$c0],@Y[$b2],@Y[$b2]
|| XOR @Y[$c1],@Y[$b3],@Y[$b3]
|| MV @Y[$d2],@Y[$d1]
|| MV @Y[$d3],@Y[$d2]
|| [B0] ROTL @X[$b1],12,@X[$b1]
|| [B0] ROTL @X[$b2],12,@X[$b2]
ROTL @Y[$b0],7,@Y[$b1] ; avoided cross-path stall
|| ROTL @Y[$b1],7,@Y[$b2]
ROTL @Y[$b2],7,@Y[$b3]
|| ROTL @Y[$b3],7,@Y[$b0]
bottom2x2?:
___
}
$code.=<<___;
ADD @K2x[0],@X[0],@X[0] ; accumulate key material
|| ADD @K2x[1],@X[1],@X[1]
|| ADD @K2x[2],@X[2],@X[2]
|| ADD @K2x[3],@X[3],@X[3]
ADD @K2x[0],@Y[0],@Y[0]
|| ADD @K2x[1],@Y[1],@Y[1]
|| ADD @K2x[2],@Y[2],@Y[2]
|| ADD @K2x[3],@Y[3],@Y[3]
|| LDNDW *${INP}++[8],@DAT[1]:@DAT[0]
ADD @K2x[4],@X[4],@X[4]
|| ADD @K2x[5],@X[5],@X[5]
|| ADD @K2x[6],@X[6],@X[6]
|| ADD @K2x[7],@X[7],@X[7]
|| LDNDW *${INP}[-7],@DAT[3]:@DAT[2]
ADD @K2x[4],@Y[4],@Y[4]
|| ADD @K2x[5],@Y[5],@Y[5]
|| ADD @K2x[6],@Y[6],@Y[6]
|| ADD @K2x[7],@Y[7],@Y[7]
|| LDNDW *${INP}[-6],@DAT[5]:@DAT[4]
ADD @K2x[8],@X[8],@X[8]
|| ADD @K2x[9],@X[9],@X[9]
|| ADD @K2x[10],@X[10],@X[10]
|| ADD @K2x[11],@X[11],@X[11]
|| LDNDW *${INP}[-5],@DAT[7]:@DAT[6]
ADD @K2x[8],@Y[8],@Y[8]
|| ADD @K2x[9],@Y[9],@Y[9]
|| ADD @K2x[10],@Y[10],@Y[10]
|| ADD @K2x[11],@Y[11],@Y[11]
|| LDNDW *${INP}[-4],@DAT[9]:@DAT[8]
ADD @K2x[12],@X[12],@X[12]
|| ADD @K2x[13],@X[13],@X[13]
|| ADD @K2x[14],@X[14],@X[14]
|| ADD @K2x[15],@X[15],@X[15]
|| LDNDW *${INP}[-3],@DAT[11]:@DAT[10]
ADD @K2x[12],@Y[12],@Y[12]
|| ADD @K2x[13],@Y[13],@Y[13]
|| ADD @K2x[14],@Y[14],@Y[14]
|| ADD @K2x[15],@Y[15],@Y[15]
|| LDNDW *${INP}[-2],@DAT[13]:@DAT[12]
ADD 1,@Y[12],@Y[12] ; adjust counter for 2nd block
|| ADD 2,@K2x[12],@K2x[12] ; increment counter
|| LDNDW *${INP}[-1],@DAT[15]:@DAT[14]
.if .BIG_ENDIAN
SWAP2 @X[0],@X[0]
|| SWAP2 @X[1],@X[1]
|| SWAP2 @X[2],@X[2]
|| SWAP2 @X[3],@X[3]
SWAP2 @X[4],@X[4]
|| SWAP2 @X[5],@X[5]
|| SWAP2 @X[6],@X[6]
|| SWAP2 @X[7],@X[7]
SWAP2 @X[8],@X[8]
|| SWAP2 @X[9],@X[9]
|| SWAP4 @X[0],@X[1]
|| SWAP4 @X[1],@X[0]
SWAP2 @X[10],@X[10]
|| SWAP2 @X[11],@X[11]
|| SWAP4 @X[2],@X[3]
|| SWAP4 @X[3],@X[2]
SWAP2 @X[12],@X[12]
|| SWAP2 @X[13],@X[13]
|| SWAP4 @X[4],@X[5]
|| SWAP4 @X[5],@X[4]
SWAP2 @X[14],@X[14]
|| SWAP2 @X[15],@X[15]
|| SWAP4 @X[6],@X[7]
|| SWAP4 @X[7],@X[6]
SWAP4 @X[8],@X[9]
|| SWAP4 @X[9],@X[8]
|| SWAP2 @Y[0],@Y[0]
|| SWAP2 @Y[1],@Y[1]
SWAP4 @X[10],@X[11]
|| SWAP4 @X[11],@X[10]
|| SWAP2 @Y[2],@Y[2]
|| SWAP2 @Y[3],@Y[3]
SWAP4 @X[12],@X[13]
|| SWAP4 @X[13],@X[12]
|| SWAP2 @Y[4],@Y[4]
|| SWAP2 @Y[5],@Y[5]
SWAP4 @X[14],@X[15]
|| SWAP4 @X[15],@X[14]
|| SWAP2 @Y[6],@Y[6]
|| SWAP2 @Y[7],@Y[7]
SWAP2 @Y[8],@Y[8]
|| SWAP2 @Y[9],@Y[9]
|| SWAP4 @Y[0],@Y[1]
|| SWAP4 @Y[1],@Y[0]
SWAP2 @Y[10],@Y[10]
|| SWAP2 @Y[11],@Y[11]
|| SWAP4 @Y[2],@Y[3]
|| SWAP4 @Y[3],@Y[2]
SWAP2 @Y[12],@Y[12]
|| SWAP2 @Y[13],@Y[13]
|| SWAP4 @Y[4],@Y[5]
|| SWAP4 @Y[5],@Y[4]
SWAP2 @Y[14],@Y[14]
|| SWAP2 @Y[15],@Y[15]
|| SWAP4 @Y[6],@Y[7]
|| SWAP4 @Y[7],@Y[6]
SWAP4 @Y[8],@Y[9]
|| SWAP4 @Y[9],@Y[8]
SWAP4 @Y[10],@Y[11]
|| SWAP4 @Y[11],@Y[10]
SWAP4 @Y[12],@Y[13]
|| SWAP4 @Y[13],@Y[12]
SWAP4 @Y[14],@Y[15]
|| SWAP4 @Y[15],@Y[14]
.endif
XOR @DAT[0],@X[0],@X[0] ; xor 1st block
|| XOR @DAT[3],@X[3],@X[3]
|| XOR @DAT[2],@X[2],@X[1]
|| XOR @DAT[1],@X[1],@X[2]
|| LDNDW *${INP}++[8],@DAT[1]:@DAT[0]
XOR @DAT[4],@X[4],@X[4]
|| XOR @DAT[7],@X[7],@X[7]
|| LDNDW *${INP}[-7],@DAT[3]:@DAT[2]
XOR @DAT[6],@X[6],@X[5]
|| XOR @DAT[5],@X[5],@X[6]
|| LDNDW *${INP}[-6],@DAT[5]:@DAT[4]
XOR @DAT[8],@X[8],@X[8]
|| XOR @DAT[11],@X[11],@X[11]
|| LDNDW *${INP}[-5],@DAT[7]:@DAT[6]
XOR @DAT[10],@X[10],@X[9]
|| XOR @DAT[9],@X[9],@X[10]
|| LDNDW *${INP}[-4],@DAT[9]:@DAT[8]
XOR @DAT[12],@X[12],@X[12]
|| XOR @DAT[15],@X[15],@X[15]
|| LDNDW *${INP}[-3],@DAT[11]:@DAT[10]
XOR @DAT[14],@X[14],@X[13]
|| XOR @DAT[13],@X[13],@X[14]
|| LDNDW *${INP}[-2],@DAT[13]:@DAT[12]
[A0] SUB A0,$STEP,A0 ; SUB A0,128,A0
|| LDNDW *${INP}[-1],@DAT[15]:@DAT[14]
XOR @Y[0],@DAT[0],@DAT[0] ; xor 2nd block
|| XOR @Y[1],@DAT[1],@DAT[1]
|| STNDW @X[2]:@X[0],*${OUT}++[8]
XOR @Y[2],@DAT[2],@DAT[2]
|| XOR @Y[3],@DAT[3],@DAT[3]
|| STNDW @X[3]:@X[1],*${OUT}[-7]
XOR @Y[4],@DAT[4],@DAT[4]
|| [A0] LDDW *FP[-12],@X[2]:@X[0] ; re-load key material from stack
|| [A0] LDDW *SP[2], @X[3]:@X[1]
XOR @Y[5],@DAT[5],@DAT[5]
|| STNDW @X[6]:@X[4],*${OUT}[-6]
XOR @Y[6],@DAT[6],@DAT[6]
|| XOR @Y[7],@DAT[7],@DAT[7]
|| STNDW @X[7]:@X[5],*${OUT}[-5]
XOR @Y[8],@DAT[8],@DAT[8]
|| [A0] LDDW *FP[-10],@X[6]:@X[4]
|| [A0] LDDW *SP[4], @X[7]:@X[5]
XOR @Y[9],@DAT[9],@DAT[9]
|| STNDW @X[10]:@X[8],*${OUT}[-4]
XOR @Y[10],@DAT[10],@DAT[10]
|| XOR @Y[11],@DAT[11],@DAT[11]
|| STNDW @X[11]:@X[9],*${OUT}[-3]
XOR @Y[12],@DAT[12],@DAT[12]
|| [A0] LDDW *FP[-8], @X[10]:@X[8]
|| [A0] LDDW *SP[6], @X[11]:@X[9]
XOR @Y[13],@DAT[13],@DAT[13]
|| STNDW @X[14]:@X[12],*${OUT}[-2]
XOR @Y[14],@DAT[14],@DAT[14]
|| XOR @Y[15],@DAT[15],@DAT[15]
|| STNDW @X[15]:@X[13],*${OUT}[-1]
[A0] MV @K2x[12],@X[12]
|| [A0] MV @K2x[13],@X[13]
|| [A0] LDW *FP[-6*2], @X[14]
|| [A0] LDW *SP[8*2], @X[15]
[A0] DMV @X[2],@X[0],@Y[2]:@Y[0] ; duplicate key material
|| STNDW @DAT[1]:@DAT[0],*${OUT}++[8]
[A0] DMV @X[3],@X[1],@Y[3]:@Y[1]
|| STNDW @DAT[3]:@DAT[2],*${OUT}[-7]
[A0] DMV @X[6],@X[4],@Y[6]:@Y[4]
|| STNDW @DAT[5]:@DAT[4],*${OUT}[-6]
|| CMPLTU A0,$STEP,A1 ; is remaining length < 2*blocks?
||[!A0] BNOP epilogue?
[A0] DMV @X[7],@X[5],@Y[7]:@Y[5]
|| STNDW @DAT[7]:@DAT[6],*${OUT}[-5]
||[!A1] BNOP outer2x?
[A0] DMV @X[10],@X[8],@Y[10]:@Y[8]
|| STNDW @DAT[9]:@DAT[8],*${OUT}[-4]
[A0] DMV @X[11],@X[9],@Y[11]:@Y[9]
|| STNDW @DAT[11]:@DAT[10],*${OUT}[-3]
[A0] DMV @X[14],@X[12],@Y[14]:@Y[12]
|| STNDW @DAT[13]:@DAT[12],*${OUT}[-2]
[A0] DMV @X[15],@X[13],@Y[15]:@Y[13]
|| STNDW @DAT[15]:@DAT[14],*${OUT}[-1]
;;===== branch to epilogue? is taken here
[A1] MVK 64,$STEP
|| [A0] MVK 10,B0 ; inner loop counter
;;===== branch to outer2x? is taken here
___
{
my ($a0,$a1,$a2,$a3) = (0..3);
my ($b0,$b1,$b2,$b3) = (4..7);
my ($c0,$c1,$c2,$c3) = (8..11);
my ($d0,$d1,$d2,$d3) = (12..15);
$code.=<<___;
top1x?:
ADD @X[$b1],@X[$a1],@X[$a1]
|| ADD @X[$b2],@X[$a2],@X[$a2]
ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a1],@X[$d1],@X[$d1]
|| XOR @X[$a2],@X[$d2],@X[$d2]
XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| SWAP2 @X[$d1],@X[$d1] ; rotate by 16
|| SWAP2 @X[$d2],@X[$d2]
SWAP2 @X[$d0],@X[$d0]
|| SWAP2 @X[$d3],@X[$d3]
|| ADD @X[$d1],@X[$c1],@X[$c1]
|| ADD @X[$d2],@X[$c2],@X[$c2]
ADD @X[$d0],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c3],@X[$c3]
|| XOR @X[$c1],@X[$b1],@X[$b1]
|| XOR @X[$c2],@X[$b2],@X[$b2]
XOR @X[$c0],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b3],@X[$b3]
|| ROTL @X[$b1],12,@X[$b1]
|| ROTL @X[$b2],12,@X[$b2]
ROTL @X[$b0],12,@X[$b0]
|| ROTL @X[$b3],12,@X[$b3]
ADD @X[$b1],@X[$a1],@X[$a1]
|| ADD @X[$b2],@X[$a2],@X[$a2]
ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a1],@X[$d1],@X[$d1]
|| XOR @X[$a2],@X[$d2],@X[$d2]
XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| ROTL @X[$d1],8,@X[$d1]
|| ROTL @X[$d2],8,@X[$d2]
ROTL @X[$d0],8,@X[$d0]
|| ROTL @X[$d3],8,@X[$d3]
|| BNOP middle1x? ; protect from interrupt
ADD @X[$d1],@X[$c1],@X[$c1]
|| ADD @X[$d2],@X[$c2],@X[$c2]
ADD @X[$d0],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c3],@X[$c3]
|| XOR @X[$c1],@X[$b1],@X[$b1]
|| XOR @X[$c2],@X[$b2],@X[$b2]
|| ROTL @X[$d1],0,@X[$d2] ; moved to avoid cross-path stall
|| ROTL @X[$d2],0,@X[$d3]
XOR @X[$c0],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b3],@X[$b3]
|| ROTL @X[$d0],0,@X[$d1]
|| ROTL @X[$d3],0,@X[$d0]
ROTL @X[$b1],7,@X[$b0] ; avoided cross-path stall
|| ROTL @X[$b2],7,@X[$b1]
ROTL @X[$b0],7,@X[$b3]
|| ROTL @X[$b3],7,@X[$b2]
middle1x?:
ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b1],@X[$a1],@X[$a1]
ADD @X[$b2],@X[$a2],@X[$a2]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a1],@X[$d1],@X[$d1]
XOR @X[$a2],@X[$d2],@X[$d2]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| SWAP2 @X[$d0],@X[$d0] ; rotate by 16
|| SWAP2 @X[$d1],@X[$d1]
SWAP2 @X[$d2],@X[$d2]
|| SWAP2 @X[$d3],@X[$d3]
|| ADD @X[$d0],@X[$c2],@X[$c2]
|| ADD @X[$d1],@X[$c3],@X[$c3]
ADD @X[$d2],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c1],@X[$c1]
|| XOR @X[$c2],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b1],@X[$b1]
XOR @X[$c0],@X[$b2],@X[$b2]
|| XOR @X[$c1],@X[$b3],@X[$b3]
|| ROTL @X[$b0],12,@X[$b0]
|| ROTL @X[$b1],12,@X[$b1]
ROTL @X[$b2],12,@X[$b2]
|| ROTL @X[$b3],12,@X[$b3]
ADD @X[$b0],@X[$a0],@X[$a0]
|| ADD @X[$b1],@X[$a1],@X[$a1]
|| [B0] SUB B0,1,B0 ; decrement inner loop counter
ADD @X[$b2],@X[$a2],@X[$a2]
|| ADD @X[$b3],@X[$a3],@X[$a3]
|| XOR @X[$a0],@X[$d0],@X[$d0]
|| XOR @X[$a1],@X[$d1],@X[$d1]
XOR @X[$a2],@X[$d2],@X[$d2]
|| XOR @X[$a3],@X[$d3],@X[$d3]
|| ROTL @X[$d0],8,@X[$d0]
|| ROTL @X[$d1],8,@X[$d1]
ROTL @X[$d2],8,@X[$d2]
|| ROTL @X[$d3],8,@X[$d3]
|| [B0] BNOP top1x? ; even protects from interrupt
ADD @X[$d0],@X[$c2],@X[$c2]
|| ADD @X[$d1],@X[$c3],@X[$c3]
ADD @X[$d2],@X[$c0],@X[$c0]
|| ADD @X[$d3],@X[$c1],@X[$c1]
|| XOR @X[$c2],@X[$b0],@X[$b0]
|| XOR @X[$c3],@X[$b1],@X[$b1]
|| ROTL @X[$d0],0,@X[$d3] ; moved to avoid cross-path stall
|| ROTL @X[$d1],0,@X[$d0]
XOR @X[$c0],@X[$b2],@X[$b2]
|| XOR @X[$c1],@X[$b3],@X[$b3]
|| ROTL @X[$d2],0,@X[$d1]
|| ROTL @X[$d3],0,@X[$d2]
ROTL @X[$b0],7,@X[$b1] ; avoided cross-path stall
|| ROTL @X[$b1],7,@X[$b2]
ROTL @X[$b2],7,@X[$b3]
|| ROTL @X[$b3],7,@X[$b0]
||[!B0] CMPLTU A0,$STEP,A1 ; less than 64 bytes left?
bottom1x?:
___
}
$code.=<<___;
ADD @Y[0],@X[0],@X[0] ; accumulate key material
|| ADD @Y[1],@X[1],@X[1]
|| ADD @Y[2],@X[2],@X[2]
|| ADD @Y[3],@X[3],@X[3]
||[!A1] LDNDW *${INP}++[8],@DAT[1]:@DAT[0]
|| [A1] BNOP tail?
ADD @Y[4],@X[4],@X[4]
|| ADD @Y[5],@X[5],@X[5]
|| ADD @Y[6],@X[6],@X[6]
|| ADD @Y[7],@X[7],@X[7]
||[!A1] LDNDW *${INP}[-7],@DAT[3]:@DAT[2]
ADD @Y[8],@X[8],@X[8]
|| ADD @Y[9],@X[9],@X[9]
|| ADD @Y[10],@X[10],@X[10]
|| ADD @Y[11],@X[11],@X[11]
||[!A1] LDNDW *${INP}[-6],@DAT[5]:@DAT[4]
ADD @Y[12],@X[12],@X[12]
|| ADD @Y[13],@X[13],@X[13]
|| ADD @Y[14],@X[14],@X[14]
|| ADD @Y[15],@X[15],@X[15]
||[!A1] LDNDW *${INP}[-5],@DAT[7]:@DAT[6]
[!A1] LDNDW *${INP}[-4],@DAT[9]:@DAT[8]
[!A1] LDNDW *${INP}[-3],@DAT[11]:@DAT[10]
LDNDW *${INP}[-2],@DAT[13]:@DAT[12]
LDNDW *${INP}[-1],@DAT[15]:@DAT[14]
.if .BIG_ENDIAN
SWAP2 @X[0],@X[0]
|| SWAP2 @X[1],@X[1]
|| SWAP2 @X[2],@X[2]
|| SWAP2 @X[3],@X[3]
SWAP2 @X[4],@X[4]
|| SWAP2 @X[5],@X[5]
|| SWAP2 @X[6],@X[6]
|| SWAP2 @X[7],@X[7]
SWAP2 @X[8],@X[8]
|| SWAP2 @X[9],@X[9]
|| SWAP4 @X[0],@X[1]
|| SWAP4 @X[1],@X[0]
SWAP2 @X[10],@X[10]
|| SWAP2 @X[11],@X[11]
|| SWAP4 @X[2],@X[3]
|| SWAP4 @X[3],@X[2]
SWAP2 @X[12],@X[12]
|| SWAP2 @X[13],@X[13]
|| SWAP4 @X[4],@X[5]
|| SWAP4 @X[5],@X[4]
SWAP2 @X[14],@X[14]
|| SWAP2 @X[15],@X[15]
|| SWAP4 @X[6],@X[7]
|| SWAP4 @X[7],@X[6]
SWAP4 @X[8],@X[9]
|| SWAP4 @X[9],@X[8]
SWAP4 @X[10],@X[11]
|| SWAP4 @X[11],@X[10]
SWAP4 @X[12],@X[13]
|| SWAP4 @X[13],@X[12]
SWAP4 @X[14],@X[15]
|| SWAP4 @X[15],@X[14]
.else
NOP 1
.endif
XOR @X[0],@DAT[0],@DAT[0] ; xor with input
|| XOR @X[1],@DAT[1],@DAT[1]
|| XOR @X[2],@DAT[2],@DAT[2]
|| XOR @X[3],@DAT[3],@DAT[3]
|| [A0] SUB A0,$STEP,A0 ; SUB A0,64,A0
XOR @X[4],@DAT[4],@DAT[4]
|| XOR @X[5],@DAT[5],@DAT[5]
|| XOR @X[6],@DAT[6],@DAT[6]
|| XOR @X[7],@DAT[7],@DAT[7]
|| STNDW @DAT[1]:@DAT[0],*${OUT}++[8]
XOR @X[8],@DAT[8],@DAT[8]
|| XOR @X[9],@DAT[9],@DAT[9]
|| XOR @X[10],@DAT[10],@DAT[10]
|| XOR @X[11],@DAT[11],@DAT[11]
|| STNDW @DAT[3]:@DAT[2],*${OUT}[-7]
XOR @X[12],@DAT[12],@DAT[12]
|| XOR @X[13],@DAT[13],@DAT[13]
|| XOR @X[14],@DAT[14],@DAT[14]
|| XOR @X[15],@DAT[15],@DAT[15]
|| STNDW @DAT[5]:@DAT[4],*${OUT}[-6]
|| [A0] BNOP top1x?
[A0] DMV @Y[2],@Y[0],@X[2]:@X[0] ; duplicate key material
|| [A0] DMV @Y[3],@Y[1],@X[3]:@X[1]
|| STNDW @DAT[7]:@DAT[6],*${OUT}[-5]
[A0] DMV @Y[6],@Y[4],@X[6]:@X[4]
|| [A0] DMV @Y[7],@Y[5],@X[7]:@X[5]
|| STNDW @DAT[9]:@DAT[8],*${OUT}[-4]
[A0] DMV @Y[10],@Y[8],@X[10]:@X[8]
|| [A0] DMV @Y[11],@Y[9],@X[11]:@X[9]
|| [A0] ADD 1,@Y[12],@Y[12] ; increment counter
|| STNDW @DAT[11]:@DAT[10],*${OUT}[-3]
[A0] DMV @Y[14],@Y[12],@X[14]:@X[12]
|| [A0] DMV @Y[15],@Y[13],@X[15]:@X[13]
|| STNDW @DAT[13]:@DAT[12],*${OUT}[-2]
[A0] MVK 10,B0 ; inner loop counter
|| STNDW @DAT[15]:@DAT[14],*${OUT}[-1]
;;===== branch to top1x? is taken here
epilogue?:
LDDW *FP[-4],A11:A10 ; ABI says so
LDDW *FP[-3],A13:A12
|| LDDW *SP[3+8],B11:B10
LDDW *SP[4+8],B13:B12
|| BNOP RA
LDW *++SP(40+64),FP ; restore frame pointer
NOP 4
tail?:
LDBU *${INP}++[1],B24 ; load byte by byte
|| SUB A0,1,A0
|| SUB A0,1,B1
[!B1] BNOP epilogue? ; interrupts are disabled for whole time
|| [A0] LDBU *${INP}++[1],B24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
[!B1] BNOP epilogue?
|| [A0] LDBU *${INP}++[1],B24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
[!B1] BNOP epilogue?
|| ROTL @X[0],0,A24
|| [A0] LDBU *${INP}++[1],B24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
[!B1] BNOP epilogue?
|| ROTL @X[0],24,A24
|| [A0] LDBU *${INP}++[1],A24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
[!B1] BNOP epilogue?
|| ROTL @X[0],16,A24
|| [A0] LDBU *${INP}++[1],A24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,B25
STB B25,*${OUT}++[1] ; store byte by byte
||[!B1] BNOP epilogue?
|| ROTL @X[0],8,A24
|| [A0] LDBU *${INP}++[1],A24
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,B25
STB B25,*${OUT}++[1]
___
sub TAIL_STEP {
my $Xi= shift;
my $T = ($Xi=~/^B/?"B24":"A24"); # match @X[i] to avoid cross path
my $D = $T; $D=~tr/AB/BA/;
my $O = $D; $O=~s/24/25/;
$code.=<<___;
||[!B1] BNOP epilogue?
|| ROTL $Xi,0,$T
|| [A0] LDBU *${INP}++[1],$D
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,$O
STB $O,*${OUT}++[1]
||[!B1] BNOP epilogue?
|| ROTL $Xi,24,$T
|| [A0] LDBU *${INP}++[1],$T
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,$O
STB $O,*${OUT}++[1]
||[!B1] BNOP epilogue?
|| ROTL $Xi,16,$T
|| [A0] LDBU *${INP}++[1],$T
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,$O
STB $O,*${OUT}++[1]
||[!B1] BNOP epilogue?
|| ROTL $Xi,8,$T
|| [A0] LDBU *${INP}++[1],$T
|| [A0] SUB A0,1,A0
|| SUB B1,1,B1
|| XOR A24,B24,$O
STB $O,*${OUT}++[1]
___
}
foreach (1..14) { TAIL_STEP(@X[$_]); }
$code.=<<___;
||[!B1] BNOP epilogue?
|| ROTL @X[15],0,B24
|| XOR A24,B24,A25
STB A25,*${OUT}++[1]
|| ROTL @X[15],24,B24
|| XOR A24,B24,A25
STB A25,*${OUT}++[1]
|| ROTL @X[15],16,B24
|| XOR A24,B24,A25
STB A25,*${OUT}++[1]
|| XOR A24,B24,A25
STB A25,*${OUT}++[1]
|| XOR A24,B24,B25
STB B25,*${OUT}++[1]
.endasmfunc
.sect .const
.cstring "ChaCha20 for C64x+, CRYPTOGAMS by <appro\@openssl.org>"
.align 4
___
print $code;
close STDOUT or die "error closing STDOUT: $!";
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