125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Unaligned memory access functionality. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2008 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2001. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifndef _MEMORY_ACCESS_H 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define _MEMORY_ACCESS_H 1 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <byteswap.h> 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <endian.h> 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <limits.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdint.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* When loading this file we require the macro MACHINE_ENCODING to be 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng defined to signal the endianness of the architecture which is 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng defined. */ 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifndef MACHINE_ENCODING 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# error "MACHINE_ENCODING needs to be defined" 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if MACHINE_ENCODING != __BIG_ENDIAN && MACHINE_ENCODING != __LITTLE_ENDIAN 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng# error "MACHINE_ENCODING must signal either big or little endian" 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* We use simple memory access functions in case the hardware allows it. 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng The caller has to make sure we don't have alias problems. */ 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if ALLOW_UNALIGNED 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_2ubyte_unaligned(Addr) \ 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_16 (*((const uint16_t *) (Addr))) \ 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint16_t *) (Addr))) 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_2sbyte_unaligned(Addr) \ 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int16_t) bswap_16 (*((const int16_t *) (Addr))) \ 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int16_t *) (Addr))) 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4ubyte_unaligned_noncvt(Addr) \ 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng *((const uint32_t *) (Addr)) 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4ubyte_unaligned(Addr) \ 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_32 (*((const uint32_t *) (Addr))) \ 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint32_t *) (Addr))) 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4sbyte_unaligned(Addr) \ 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int32_t) bswap_32 (*((const int32_t *) (Addr))) \ 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int32_t *) (Addr))) 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_8ubyte_unaligned(Addr) \ 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_64 (*((const uint64_t *) (Addr))) \ 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint64_t *) (Addr))) 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_8sbyte_unaligned(Addr) \ 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int64_t) bswap_64 (*((const int64_t *) (Addr))) \ 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int64_t *) (Addr))) 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8425b3c049e70834cf33790a28643ab058b507b35cBen Chengunion unaligned 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *p; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint16_t u2; 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint32_t u4; 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint64_t u8; 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng int16_t s2; 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng int32_t s4; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng int64_t s8; 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } __attribute__ ((packed)); 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9525b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint16_t 9625b3c049e70834cf33790a28643ab058b507b35cBen Chengread_2ubyte_unaligned (const void *p) 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_16 (up->u2); 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u2; 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 10325b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int16_t 10425b3c049e70834cf33790a28643ab058b507b35cBen Chengread_2sbyte_unaligned (const void *p) 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int16_t) bswap_16 (up->u2); 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s2; 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11225b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint32_t 11325b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4ubyte_unaligned_noncvt (const void *p) 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u4; 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11825b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint32_t 11925b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4ubyte_unaligned (const void *p) 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_32 (up->u4); 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u4; 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 12625b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int32_t 12725b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4sbyte_unaligned (const void *p) 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int32_t) bswap_32 (up->u4); 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s4; 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13525b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint64_t 13625b3c049e70834cf33790a28643ab058b507b35cBen Chengread_8ubyte_unaligned (const void *p) 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_64 (up->u8); 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u8; 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14325b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int64_t 14425b3c049e70834cf33790a28643ab058b507b35cBen Chengread_8sbyte_unaligned (const void *p) 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int64_t) bswap_64 (up->u8); 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s8; 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif /* allow unaligned */ 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_2ubyte_unaligned_inc(Addr) \ 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint16_t t_ = read_2ubyte_unaligned (Addr); \ 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_2sbyte_unaligned_inc(Addr) \ 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int16_t t_ = read_2sbyte_unaligned (Addr); \ 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_4ubyte_unaligned_inc(Addr) \ 16525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint32_t t_ = read_4ubyte_unaligned (Addr); \ 16625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ 16725b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 16825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_4sbyte_unaligned_inc(Addr) \ 16925b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int32_t t_ = read_4sbyte_unaligned (Addr); \ 17025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ 17125b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 17225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_8ubyte_unaligned_inc(Addr) \ 17425b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint64_t t_ = read_8ubyte_unaligned (Addr); \ 17525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ 17625b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 17725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_8sbyte_unaligned_inc(Addr) \ 17825b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int64_t t_ = read_8sbyte_unaligned (Addr); \ 17925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ 18025b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 18125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 18225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif /* memory-access.h */ 183