518 lines
21 KiB
C
518 lines
21 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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/*
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* Define MBEDTLS_EFFICIENT_UNALIGNED_ACCESS for architectures where unaligned memory
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* accesses are known to be efficient.
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*
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* All functions defined here will behave correctly regardless, but might be less
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* efficient when this is not defined.
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*/
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#if defined(__ARM_FEATURE_UNALIGNED) \
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|| defined(__i386__) || defined(__amd64__) || defined(__x86_64__)
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/*
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* __ARM_FEATURE_UNALIGNED is defined where appropriate by armcc, gcc 7, clang 9
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* (and later versions) for Arm v7 and later; all x86 platforms should have
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* efficient unaligned access.
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*/
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#define MBEDTLS_EFFICIENT_UNALIGNED_ACCESS
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#endif
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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) && !defined(MBEDTLS_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) && !defined(MBEDTLS_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) && !defined(MBEDTLS_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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#if !defined(MBEDTLS_BSWAP16)
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#define MBEDTLS_BSWAP16 _byteswap_ushort
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#endif
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#if !defined(MBEDTLS_BSWAP32)
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#define MBEDTLS_BSWAP32 _byteswap_ulong
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#endif
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#if !defined(MBEDTLS_BSWAP64)
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#define MBEDTLS_BSWAP64 _byteswap_uint64
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#endif
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#endif /* defined(_MSC_VER) */
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/* Detect armcc built-in byteswap routine */
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#if defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 410000) && !defined(MBEDTLS_BSWAP32)
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#define MBEDTLS_BSWAP32 __rev
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#endif
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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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{
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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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{
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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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{
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return
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(x & 0x00000000000000ffULL) << 56 |
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(x & 0x000000000000ff00ULL) << 40 |
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(x & 0x0000000000ff0000ULL) << 24 |
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(x & 0x00000000ff000000ULL) << 8 |
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(x & 0x000000ff00000000ULL) >> 8 |
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(x & 0x0000ff0000000000ULL) >> 24 |
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(x & 0x00ff000000000000ULL) >> 40 |
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(x & 0xff00000000000000ULL) >> 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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|
/**
|
|
* Get the unsigned 64 bits integer corresponding to eight bytes in
|
|
* little-endian order (LSB first).
|
|
*
|
|
* \param data Base address of the memory to get the eight bytes from.
|
|
* \param offset Offset from \p data of the first and least significant
|
|
* byte of the eight bytes to build the 64 bits unsigned
|
|
* integer from.
|
|
*/
|
|
#define MBEDTLS_GET_UINT64_LE(data, offset) \
|
|
((MBEDTLS_IS_BIG_ENDIAN) \
|
|
? MBEDTLS_BSWAP64(mbedtls_get_unaligned_uint64((data) + (offset))) \
|
|
: mbedtls_get_unaligned_uint64((data) + (offset)) \
|
|
)
|
|
|
|
/**
|
|
* Put in memory a 64 bits unsigned integer in little-endian order.
|
|
*
|
|
* \param n 64 bits unsigned integer to put in memory.
|
|
* \param data Base address of the memory where to put the 64
|
|
* bits unsigned integer in.
|
|
* \param offset Offset from \p data where to put the least significant
|
|
* byte of the 64 bits unsigned integer \p n.
|
|
*/
|
|
#define MBEDTLS_PUT_UINT64_LE(n, data, offset) \
|
|
{ \
|
|
if (MBEDTLS_IS_BIG_ENDIAN) \
|
|
{ \
|
|
mbedtls_put_unaligned_uint64((data) + (offset), MBEDTLS_BSWAP64((uint64_t) (n))); \
|
|
} \
|
|
else \
|
|
{ \
|
|
mbedtls_put_unaligned_uint64((data) + (offset), (uint64_t) (n)); \
|
|
} \
|
|
}
|
|
|
|
#endif /* MBEDTLS_LIBRARY_ALIGNMENT_H */
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