489 lines
20 KiB
C
489 lines
20 KiB
C
/**
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* \file alignment.h
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*
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* \brief Utility code for dealing with unaligned memory accesses
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_LIBRARY_ALIGNMENT_H
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#define MBEDTLS_LIBRARY_ALIGNMENT_H
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include "mbedtls/build_info.h"
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/**
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* Read the unsigned 16 bits integer from the given address, which need not
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* be aligned.
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*
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* \param p pointer to 2 bytes of data
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* \return Data at the given address
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*/
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inline uint16_t mbedtls_get_unaligned_uint16( const void *p )
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{
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uint16_t r;
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memcpy( &r, p, sizeof( r ) );
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return r;
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}
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/**
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* Write the unsigned 16 bits integer to the given address, which need not
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* be aligned.
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*
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* \param p pointer to 2 bytes of data
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* \param x data to write
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*/
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inline void mbedtls_put_unaligned_uint16( void *p, uint16_t x )
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{
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memcpy( p, &x, sizeof( x ) );
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}
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/**
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* Read the unsigned 32 bits integer from the given address, which need not
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* be aligned.
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*
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* \param p pointer to 4 bytes of data
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* \return Data at the given address
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*/
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inline uint32_t mbedtls_get_unaligned_uint32( const void *p )
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{
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uint32_t r;
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memcpy( &r, p, sizeof( r ) );
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return r;
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}
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/**
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* Write the unsigned 32 bits integer to the given address, which need not
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* be aligned.
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*
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* \param p pointer to 4 bytes of data
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* \param x data to write
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*/
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inline void mbedtls_put_unaligned_uint32( void *p, uint32_t x )
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{
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memcpy( p, &x, sizeof( x ) );
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}
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/**
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* Read the unsigned 64 bits integer from the given address, which need not
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* be aligned.
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*
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* \param p pointer to 8 bytes of data
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* \return Data at the given address
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*/
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inline uint64_t mbedtls_get_unaligned_uint64( const void *p )
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{
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uint64_t r;
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memcpy( &r, p, sizeof( r ) );
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return r;
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}
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/**
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* Write the unsigned 64 bits integer to the given address, which need not
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* be aligned.
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*
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* \param p pointer to 8 bytes of data
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* \param x data to write
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*/
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inline void mbedtls_put_unaligned_uint64( void *p, uint64_t x )
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{
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memcpy( p, &x, sizeof( x ) );
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}
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/** Byte Reading Macros
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*
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* Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th
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* byte from x, where byte 0 is the least significant byte.
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*/
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#define MBEDTLS_BYTE_0( x ) ( (uint8_t) ( ( x ) & 0xff ) )
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#define MBEDTLS_BYTE_1( x ) ( (uint8_t) ( ( ( x ) >> 8 ) & 0xff ) )
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#define MBEDTLS_BYTE_2( x ) ( (uint8_t) ( ( ( x ) >> 16 ) & 0xff ) )
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#define MBEDTLS_BYTE_3( x ) ( (uint8_t) ( ( ( x ) >> 24 ) & 0xff ) )
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#define MBEDTLS_BYTE_4( x ) ( (uint8_t) ( ( ( x ) >> 32 ) & 0xff ) )
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#define MBEDTLS_BYTE_5( x ) ( (uint8_t) ( ( ( x ) >> 40 ) & 0xff ) )
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#define MBEDTLS_BYTE_6( x ) ( (uint8_t) ( ( ( x ) >> 48 ) & 0xff ) )
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#define MBEDTLS_BYTE_7( x ) ( (uint8_t) ( ( ( x ) >> 56 ) & 0xff ) )
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/*
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* Detect GCC built-in byteswap routines
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*/
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#if defined(__GNUC__) && defined(__GNUC_PREREQ)
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#if __GNUC_PREREQ(4,8)
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#define MBEDTLS_BSWAP16 __builtin_bswap16
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#endif /* __GNUC_PREREQ(4,8) */
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#if __GNUC_PREREQ(4,3)
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#define MBEDTLS_BSWAP32 __builtin_bswap32
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#define MBEDTLS_BSWAP64 __builtin_bswap64
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#endif /* __GNUC_PREREQ(4,3) */
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#endif /* defined(__GNUC__) && defined(__GNUC_PREREQ) */
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/*
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* Detect Clang built-in byteswap routines
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*/
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#if defined(__clang__) && defined(__has_builtin)
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#if __has_builtin(__builtin_bswap16)
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#define MBEDTLS_BSWAP16 __builtin_bswap16
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#endif /* __has_builtin(__builtin_bswap16) */
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#if __has_builtin(__builtin_bswap32)
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#define MBEDTLS_BSWAP32 __builtin_bswap32
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#endif /* __has_builtin(__builtin_bswap32) */
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#if __has_builtin(__builtin_bswap64)
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#define MBEDTLS_BSWAP64 __builtin_bswap64
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#endif /* __has_builtin(__builtin_bswap64) */
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#endif /* defined(__clang__) && defined(__has_builtin) */
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/*
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* Detect MSVC built-in byteswap routines
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*/
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#if defined(_MSC_VER)
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#define MBEDTLS_BSWAP16 _byteswap_ushort
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#define MBEDTLS_BSWAP32 _byteswap_ulong
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#define MBEDTLS_BSWAP64 _byteswap_uint64
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#endif /* defined(_MSC_VER) */
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/*
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* Where compiler built-ins are not present, fall back to C code that the
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* compiler may be able to detect and transform into the relevant bswap or
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* similar instruction.
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*/
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#if !defined(MBEDTLS_BSWAP16)
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static inline uint16_t mbedtls_bswap16( uint16_t x ) {
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return
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( x & 0x00ff ) << 8 |
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( x & 0xff00 ) >> 8;
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}
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#define MBEDTLS_BSWAP16 mbedtls_bswap16
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#endif /* !defined(MBEDTLS_BSWAP16) */
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#if !defined(MBEDTLS_BSWAP32)
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static inline uint32_t mbedtls_bswap32( uint32_t x ) {
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return
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( x & 0x000000ff ) << 24 |
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( x & 0x0000ff00 ) << 8 |
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( x & 0x00ff0000 ) >> 8 |
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( x & 0xff000000 ) >> 24;
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}
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#define MBEDTLS_BSWAP32 mbedtls_bswap32
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#endif /* !defined(MBEDTLS_BSWAP32) */
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#if !defined(MBEDTLS_BSWAP64)
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static inline uint64_t mbedtls_bswap64( uint64_t x ) {
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return
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( x & 0x00000000000000ff ) << 56 |
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( x & 0x000000000000ff00 ) << 40 |
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( x & 0x0000000000ff0000 ) << 24 |
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( x & 0x00000000ff000000 ) << 8 |
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( x & 0x000000ff00000000 ) >> 8 |
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( x & 0x0000ff0000000000 ) >> 24 |
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( x & 0x00ff000000000000 ) >> 40 |
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( x & 0xff00000000000000 ) >> 56;
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}
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#define MBEDTLS_BSWAP64 mbedtls_bswap64
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#endif /* !defined(MBEDTLS_BSWAP64) */
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#if !defined(__BYTE_ORDER__)
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static const uint16_t mbedtls_byte_order_detector = { 0x100 };
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#define MBEDTLS_IS_BIG_ENDIAN (*((unsigned char *) (&mbedtls_byte_order_detector)) == 0x01)
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#else
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#define MBEDTLS_IS_BIG_ENDIAN ((__BYTE_ORDER__) == (__ORDER_BIG_ENDIAN__))
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#endif /* !defined(__BYTE_ORDER__) */
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/**
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* Get the unsigned 32 bits integer corresponding to four bytes in
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* big-endian order (MSB first).
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*
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* \param data Base address of the memory to get the four bytes from.
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* \param offset Offset from \p data of the first and most significant
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* byte of the four bytes to build the 32 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT32_BE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? mbedtls_get_unaligned_uint32((data) + (offset)) \
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: MBEDTLS_BSWAP32(mbedtls_get_unaligned_uint32((data) + (offset))) \
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)
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/**
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* Put in memory a 32 bits unsigned integer in big-endian order.
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*
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* \param n 32 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 32
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the most significant
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* byte of the 32 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT32_BE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint32((data) + (offset), (uint32_t)(n)); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint32((data) + (offset), MBEDTLS_BSWAP32((uint32_t)(n))); \
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} \
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}
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/**
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* Get the unsigned 32 bits integer corresponding to four bytes in
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* little-endian order (LSB first).
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*
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* \param data Base address of the memory to get the four bytes from.
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* \param offset Offset from \p data of the first and least significant
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* byte of the four bytes to build the 32 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT32_LE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? MBEDTLS_BSWAP32(mbedtls_get_unaligned_uint32((data) + (offset))) \
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: mbedtls_get_unaligned_uint32((data) + (offset)) \
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)
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/**
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* Put in memory a 32 bits unsigned integer in little-endian order.
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*
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* \param n 32 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 32
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the least significant
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* byte of the 32 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT32_LE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint32((data) + (offset), MBEDTLS_BSWAP32((uint32_t)(n))); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint32((data) + (offset), ((uint32_t)(n))); \
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} \
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}
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/**
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* Get the unsigned 16 bits integer corresponding to two bytes in
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* little-endian order (LSB first).
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*
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* \param data Base address of the memory to get the two bytes from.
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* \param offset Offset from \p data of the first and least significant
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* byte of the two bytes to build the 16 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT16_LE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? MBEDTLS_BSWAP16(mbedtls_get_unaligned_uint16((data) + (offset))) \
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: mbedtls_get_unaligned_uint16((data) + (offset)) \
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)
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/**
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* Put in memory a 16 bits unsigned integer in little-endian order.
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*
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* \param n 16 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 16
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the least significant
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* byte of the 16 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT16_LE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint16((data) + (offset), MBEDTLS_BSWAP16((uint16_t)(n))); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint16((data) + (offset), (uint16_t)(n)); \
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} \
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}
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/**
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* Get the unsigned 16 bits integer corresponding to two bytes in
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* big-endian order (MSB first).
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*
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* \param data Base address of the memory to get the two bytes from.
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* \param offset Offset from \p data of the first and most significant
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* byte of the two bytes to build the 16 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT16_BE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? mbedtls_get_unaligned_uint16((data) + (offset)) \
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: MBEDTLS_BSWAP16(mbedtls_get_unaligned_uint16((data) + (offset))) \
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)
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/**
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* Put in memory a 16 bits unsigned integer in big-endian order.
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*
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* \param n 16 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 16
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the most significant
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* byte of the 16 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT16_BE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint16((data) + (offset), (uint16_t)(n)); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint16((data) + (offset), MBEDTLS_BSWAP16((uint16_t)(n))); \
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} \
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}
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/**
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* Get the unsigned 24 bits integer corresponding to three bytes in
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* big-endian order (MSB first).
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*
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* \param data Base address of the memory to get the three bytes from.
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* \param offset Offset from \p data of the first and most significant
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* byte of the three bytes to build the 24 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT24_BE( data , offset ) \
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( \
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( (uint32_t) ( data )[( offset ) ] << 16 ) \
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| ( (uint32_t) ( data )[( offset ) + 1] << 8 ) \
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| ( (uint32_t) ( data )[( offset ) + 2] ) \
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)
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/**
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* Put in memory a 24 bits unsigned integer in big-endian order.
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*
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* \param n 24 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 24
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the most significant
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* byte of the 24 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT24_BE( n, data, offset ) \
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{ \
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( data )[( offset ) ] = MBEDTLS_BYTE_2( n ); \
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( data )[( offset ) + 1] = MBEDTLS_BYTE_1( n ); \
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( data )[( offset ) + 2] = MBEDTLS_BYTE_0( n ); \
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}
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/**
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* Get the unsigned 24 bits integer corresponding to three bytes in
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* little-endian order (LSB first).
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*
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* \param data Base address of the memory to get the three bytes from.
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* \param offset Offset from \p data of the first and least significant
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* byte of the three bytes to build the 24 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT24_LE( data, offset ) \
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( \
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( (uint32_t) ( data )[( offset ) ] ) \
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| ( (uint32_t) ( data )[( offset ) + 1] << 8 ) \
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| ( (uint32_t) ( data )[( offset ) + 2] << 16 ) \
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)
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/**
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* Put in memory a 24 bits unsigned integer in little-endian order.
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*
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* \param n 24 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 24
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the least significant
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* byte of the 24 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT24_LE( n, data, offset ) \
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{ \
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( data )[( offset ) ] = MBEDTLS_BYTE_0( n ); \
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( data )[( offset ) + 1] = MBEDTLS_BYTE_1( n ); \
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( data )[( offset ) + 2] = MBEDTLS_BYTE_2( n ); \
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}
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/**
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* Get the unsigned 64 bits integer corresponding to eight bytes in
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* big-endian order (MSB first).
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*
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* \param data Base address of the memory to get the eight bytes from.
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* \param offset Offset from \p data of the first and most significant
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* byte of the eight bytes to build the 64 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT64_BE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? mbedtls_get_unaligned_uint64((data) + (offset)) \
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: MBEDTLS_BSWAP64(mbedtls_get_unaligned_uint64((data) + (offset))) \
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)
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/**
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* Put in memory a 64 bits unsigned integer in big-endian order.
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*
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* \param n 64 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 64
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the most significant
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* byte of the 64 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT64_BE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint64((data) + (offset), (uint64_t)(n)); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint64((data) + (offset), MBEDTLS_BSWAP64((uint64_t)(n))); \
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} \
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}
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/**
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* Get the unsigned 64 bits integer corresponding to eight bytes in
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* little-endian order (LSB first).
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*
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* \param data Base address of the memory to get the eight bytes from.
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* \param offset Offset from \p data of the first and least significant
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* byte of the eight bytes to build the 64 bits unsigned
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* integer from.
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*/
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#define MBEDTLS_GET_UINT64_LE( data, offset ) \
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( ( MBEDTLS_IS_BIG_ENDIAN ) \
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? MBEDTLS_BSWAP64(mbedtls_get_unaligned_uint64((data) + (offset))) \
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: mbedtls_get_unaligned_uint64((data) + (offset)) \
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)
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/**
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* Put in memory a 64 bits unsigned integer in little-endian order.
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*
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* \param n 64 bits unsigned integer to put in memory.
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* \param data Base address of the memory where to put the 64
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* bits unsigned integer in.
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* \param offset Offset from \p data where to put the least significant
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* byte of the 64 bits unsigned integer \p n.
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*/
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#define MBEDTLS_PUT_UINT64_LE( n, data, offset ) \
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{ \
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if ( MBEDTLS_IS_BIG_ENDIAN ) \
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{ \
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mbedtls_put_unaligned_uint64((data) + (offset), MBEDTLS_BSWAP64((uint64_t)(n))); \
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} \
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else \
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{ \
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mbedtls_put_unaligned_uint64((data) + (offset), (uint64_t)(n)); \
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} \
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}
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#endif /* MBEDTLS_LIBRARY_ALIGNMENT_H */
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