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 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifndef _MEMORY_ACCESS_H 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define _MEMORY_ACCESS_H 1 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <byteswap.h> 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <endian.h> 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <limits.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdint.h> 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* When loading this file we require the macro MACHINE_ENCODING to be 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng defined to signal the endianness of the architecture which is 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng defined. */ 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifndef MACHINE_ENCODING 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng# error "MACHINE_ENCODING needs to be defined" 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if MACHINE_ENCODING != __BIG_ENDIAN && MACHINE_ENCODING != __LITTLE_ENDIAN 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# error "MACHINE_ENCODING must signal either big or little endian" 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* We use simple memory access functions in case the hardware allows it. 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng The caller has to make sure we don't have alias problems. */ 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if ALLOW_UNALIGNED 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_2ubyte_unaligned(Addr) \ 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_16 (*((const uint16_t *) (Addr))) \ 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint16_t *) (Addr))) 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_2sbyte_unaligned(Addr) \ 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int16_t) bswap_16 (*((const int16_t *) (Addr))) \ 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int16_t *) (Addr))) 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4ubyte_unaligned_noncvt(Addr) \ 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng *((const uint32_t *) (Addr)) 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4ubyte_unaligned(Addr) \ 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_32 (*((const uint32_t *) (Addr))) \ 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint32_t *) (Addr))) 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_4sbyte_unaligned(Addr) \ 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int32_t) bswap_32 (*((const int32_t *) (Addr))) \ 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int32_t *) (Addr))) 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_8ubyte_unaligned(Addr) \ 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_64 (*((const uint64_t *) (Addr))) \ 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const uint64_t *) (Addr))) 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define read_8sbyte_unaligned(Addr) \ 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng (unlikely (MACHINE_ENCODING != __BYTE_ORDER) \ 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (int64_t) bswap_64 (*((const int64_t *) (Addr))) \ 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng : *((const int64_t *) (Addr))) 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8125b3c049e70834cf33790a28643ab058b507b35cBen Chengunion unaligned 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *p; 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint16_t u2; 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint32_t u4; 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint64_t u8; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng int16_t s2; 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng int32_t s4; 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng int64_t s8; 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } __attribute__ ((packed)); 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9225b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint16_t 9325b3c049e70834cf33790a28643ab058b507b35cBen Chengread_2ubyte_unaligned (const void *p) 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_16 (up->u2); 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u2; 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 10025b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int16_t 10125b3c049e70834cf33790a28643ab058b507b35cBen Chengread_2sbyte_unaligned (const void *p) 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int16_t) bswap_16 (up->u2); 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s2; 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10925b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint32_t 11025b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4ubyte_unaligned_noncvt (const void *p) 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u4; 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11525b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint32_t 11625b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4ubyte_unaligned (const void *p) 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_32 (up->u4); 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u4; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 12325b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int32_t 12425b3c049e70834cf33790a28643ab058b507b35cBen Chengread_4sbyte_unaligned (const void *p) 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int32_t) bswap_32 (up->u4); 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s4; 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13225b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline uint64_t 13325b3c049e70834cf33790a28643ab058b507b35cBen Chengread_8ubyte_unaligned (const void *p) 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return bswap_64 (up->u8); 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->u8; 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14025b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline int64_t 14125b3c049e70834cf33790a28643ab058b507b35cBen Chengread_8sbyte_unaligned (const void *p) 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng const union unaligned *up = p; 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (MACHINE_ENCODING != __BYTE_ORDER) 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (int64_t) bswap_64 (up->u8); 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return up->s8; 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif /* allow unaligned */ 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_2ubyte_unaligned_inc(Addr) \ 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint16_t t_ = read_2ubyte_unaligned (Addr); \ 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_2sbyte_unaligned_inc(Addr) \ 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int16_t t_ = read_2sbyte_unaligned (Addr); \ 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \ 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_4ubyte_unaligned_inc(Addr) \ 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint32_t t_ = read_4ubyte_unaligned (Addr); \ 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ 16425b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 16525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_4sbyte_unaligned_inc(Addr) \ 16625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int32_t t_ = read_4sbyte_unaligned (Addr); \ 16725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \ 16825b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 16925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_8ubyte_unaligned_inc(Addr) \ 17125b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ uint64_t t_ = read_8ubyte_unaligned (Addr); \ 17225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ 17325b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 17425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define read_8sbyte_unaligned_inc(Addr) \ 17525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ({ int64_t t_ = read_8sbyte_unaligned (Addr); \ 17625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \ 17725b3c049e70834cf33790a28643ab058b507b35cBen Cheng t_; }) 17825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif /* memory-access.h */ 180