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#! /usr/bin/env perl
# Copyright 2022 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
# $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;
$output and open STDOUT,">$output";
{
my ($in_a,$in_b,$len,$x,$temp1,$temp2) = ('a0','a1','a2','t0','t1','t2');
$code.=<<___;
################################################################################
# int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len)
################################################################################
.text
.balign 16
.globl CRYPTO_memcmp
.type CRYPTO_memcmp,\@function
CRYPTO_memcmp:
li $x,0
beqz $len,2f # len == 0
1:
lbu $temp1,0($in_a)
lbu $temp2,0($in_b)
addi $in_a,$in_a,1
addi $in_b,$in_b,1
addi $len,$len,-1
xor $temp1,$temp1,$temp2
or $x,$x,$temp1
bgtz $len,1b
2:
mv a0,$x
ret
___
}
{
my ($ptr,$len,$temp1,$temp2) = ('a0','a1','t0','t1');
$code.=<<___;
################################################################################
# void OPENSSL_cleanse(void *ptr, size_t len)
################################################################################
.text
.balign 16
.globl OPENSSL_cleanse
.type OPENSSL_cleanse,\@function
OPENSSL_cleanse:
beqz $len,2f # len == 0, return
srli $temp1,$len,4
bnez $temp1,3f # len > 15
1: # Store <= 15 individual bytes
sb x0,0($ptr)
addi $ptr,$ptr,1
addi $len,$len,-1
bnez $len,1b
2:
ret
3: # Store individual bytes until we are aligned
andi $temp1,$ptr,0x3
beqz $temp1,4f
sb x0,0($ptr)
addi $ptr,$ptr,1
addi $len,$len,-1
j 3b
4: # Store aligned words
li $temp2,4
4:
sw x0,0($ptr)
addi $ptr,$ptr,4
addi $len,$len,-4
bge $len,$temp2,4b # if len>=4 loop
bnez $len,1b # if len<4 and len != 0, store remaining bytes
ret
___
}
print $code;
close STDOUT or die "error closing STDOUT: $!";
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