90 lines
2.4 KiB
Perl
90 lines
2.4 KiB
Perl
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#! /usr/bin/env perl
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# Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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#
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# Licensed under the Apache License 2.0 (the "License"). You may not use
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# this file except in compliance with the License. You can obtain a copy
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# in the file LICENSE in the source distribution or at
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# https://www.openssl.org/source/license.html
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# $output is the last argument if it looks like a file (it has an extension)
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# $flavour is the first argument if it doesn't look like a file
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$output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
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$flavour = $#ARGV >= 0 && $ARGV[0] !~ m|\.| ? shift : undef;
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$output and open STDOUT,">$output";
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{
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my ($in_a,$in_b,$len,$x,$temp1,$temp2) = ('a0','a1','a2','t0','t1','t2');
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$code.=<<___;
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################################################################################
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# int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len)
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################################################################################
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.text
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.balign 16
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.globl CRYPTO_memcmp
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.type CRYPTO_memcmp,\@function
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CRYPTO_memcmp:
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li $x,0
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beqz $len,2f # len == 0
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1:
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lbu $temp1,0($in_a)
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lbu $temp2,0($in_b)
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addi $in_a,$in_a,1
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addi $in_b,$in_b,1
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addi $len,$len,-1
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xor $temp1,$temp1,$temp2
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or $x,$x,$temp1
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bgtz $len,1b
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2:
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mv a0,$x
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ret
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___
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}
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{
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my ($ptr,$len,$temp1,$temp2) = ('a0','a1','t0','t1');
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$code.=<<___;
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################################################################################
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# void OPENSSL_cleanse(void *ptr, size_t len)
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################################################################################
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.text
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.balign 16
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.globl OPENSSL_cleanse
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.type OPENSSL_cleanse,\@function
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OPENSSL_cleanse:
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beqz $len,2f # len == 0, return
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srli $temp1,$len,4
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bnez $temp1,3f # len > 15
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1: # Store <= 15 individual bytes
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sb x0,0($ptr)
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addi $ptr,$ptr,1
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addi $len,$len,-1
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bnez $len,1b
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2:
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ret
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3: # Store individual bytes until we are aligned
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andi $temp1,$ptr,0x7
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beqz $temp1,4f
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sb x0,0($ptr)
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addi $ptr,$ptr,1
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addi $len,$len,-1
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j 3b
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4: # Store aligned dwords
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li $temp2,8
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4:
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sd x0,0($ptr)
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addi $ptr,$ptr,8
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addi $len,$len,-8
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bge $len,$temp2,4b # if len>=8 loop
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bnez $len,1b # if len<8 and len != 0, store remaining bytes
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ret
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___
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}
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print $code;
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close STDOUT or die "error closing STDOUT: $!";
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