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/* Unaligned memory access functionality.
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Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2008 Red Hat, Inc.
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Written by Ulrich Drepper <drepper@redhat.com>, 2001.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _MEMORY_ACCESS_H
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#define _MEMORY_ACCESS_H 1
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#include <byteswap.h>
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#include <endian.h>
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#include <limits.h>
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#include <stdint.h>
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/* When loading this file we require the macro MACHINE_ENCODING to be
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defined to signal the endianness of the architecture which is
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defined. */
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#ifndef MACHINE_ENCODING
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# error "MACHINE_ENCODING needs to be defined"
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#endif
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#if MACHINE_ENCODING != __BIG_ENDIAN && MACHINE_ENCODING != __LITTLE_ENDIAN
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# error "MACHINE_ENCODING must signal either big or little endian"
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#endif
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/* We use simple memory access functions in case the hardware allows it.
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The caller has to make sure we don't have alias problems. */
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#if ALLOW_UNALIGNED
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# define read_2ubyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? bswap_16 (*((const uint16_t *) (Addr))) \
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: *((const uint16_t *) (Addr)))
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# define read_2sbyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? (int16_t) bswap_16 (*((const int16_t *) (Addr))) \
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: *((const int16_t *) (Addr)))
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# define read_4ubyte_unaligned_noncvt(Addr) \
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*((const uint32_t *) (Addr))
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# define read_4ubyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? bswap_32 (*((const uint32_t *) (Addr))) \
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: *((const uint32_t *) (Addr)))
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# define read_4sbyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? (int32_t) bswap_32 (*((const int32_t *) (Addr))) \
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: *((const int32_t *) (Addr)))
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# define read_8ubyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? bswap_64 (*((const uint64_t *) (Addr))) \
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: *((const uint64_t *) (Addr)))
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# define read_8sbyte_unaligned(Addr) \
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(unlikely (MACHINE_ENCODING != __BYTE_ORDER) \
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? (int64_t) bswap_64 (*((const int64_t *) (Addr))) \
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: *((const int64_t *) (Addr)))
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#else
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union unaligned
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{
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void *p;
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uint16_t u2;
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uint32_t u4;
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uint64_t u8;
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int16_t s2;
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int32_t s4;
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int64_t s8;
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} attribute_packed;
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static inline uint16_t
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read_2ubyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return bswap_16 (up->u2);
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return up->u2;
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}
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static inline int16_t
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read_2sbyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return (int16_t) bswap_16 (up->u2);
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return up->s2;
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}
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static inline uint32_t
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read_4ubyte_unaligned_noncvt (const void *p)
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{
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const union unaligned *up = p;
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return up->u4;
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}
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static inline uint32_t
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read_4ubyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return bswap_32 (up->u4);
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return up->u4;
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}
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static inline int32_t
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read_4sbyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return (int32_t) bswap_32 (up->u4);
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return up->s4;
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}
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static inline uint64_t
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read_8ubyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return bswap_64 (up->u8);
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return up->u8;
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}
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static inline int64_t
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read_8sbyte_unaligned (const void *p)
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{
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const union unaligned *up = p;
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if (MACHINE_ENCODING != __BYTE_ORDER)
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return (int64_t) bswap_64 (up->u8);
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return up->s8;
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}
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#endif /* allow unaligned */
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#define read_2ubyte_unaligned_inc(Addr) \
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({ uint16_t t_ = read_2ubyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \
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t_; })
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#define read_2sbyte_unaligned_inc(Addr) \
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({ int16_t t_ = read_2sbyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2); \
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t_; })
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#define read_4ubyte_unaligned_inc(Addr) \
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({ uint32_t t_ = read_4ubyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \
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t_; })
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#define read_4sbyte_unaligned_inc(Addr) \
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({ int32_t t_ = read_4sbyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4); \
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t_; })
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#define read_8ubyte_unaligned_inc(Addr) \
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({ uint64_t t_ = read_8ubyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \
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t_; })
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#define read_8sbyte_unaligned_inc(Addr) \
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({ int64_t t_ = read_8sbyte_unaligned (Addr); \
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Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8); \
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t_; })
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#endif /* memory-access.h */
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