swap64.c

linux下基于c++的处理器仿真平台。具有处理器流水线

/*
swap64.c - 64-bit byte swapping functions.
Copyright (C) 1995 - 2001 Michael Riepe <[e-mail]>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <private.h>
#include <byteswap.h>

#if __LIBELF64

#ifndef lint
static const char rcsid[] = "@(#) $Id: swap64.c,v 1.2 2001/10/07 19:33:03 michael Exp $";
#endif /* lint */

__libelf_u64_t
_elf_load_u64L(const unsigned char *from) {
    return ((__libelf_u64_t)__load_u32L(from + 4) << 32)
	 | (__libelf_u64_t)__load_u32L(from);
}

__libelf_u64_t
_elf_load_u64M(const unsigned char *from) {
    return ((__libelf_u64_t)__load_u32M(from) << 32)
	 | (__libelf_u64_t)__load_u32M(from + 4);
}

__libelf_i64_t
_elf_load_i64L(const unsigned char *from) {
    return ((__libelf_i64_t)__load_i32L(from + 4) << 32)
	 | (__libelf_u64_t)__load_u32L(from);
}

__libelf_i64_t
_elf_load_i64M(const unsigned char *from) {
    return ((__libelf_i64_t)__load_i32M(from) << 32)
	 | (__libelf_u64_t)__load_u32M(from + 4);
}

void
_elf_store_u64L(unsigned char *to, __libelf_u64_t v) {
    __store_u32L(to, (__libelf_u32_t)v);
    v >>= 32;
    __store_u32L(to + 4, (__libelf_u32_t)v);
}

void
_elf_store_u64M(unsigned char *to, __libelf_u64_t v) {
    __store_u32M(to + 4, (__libelf_u32_t)v);
    v >>= 32;
    __store_u32M(to, (__libelf_u32_t)v);
}

void
_elf_store_i64L(unsigned char *to, __libelf_u64_t v) {
    __store_u32L(to, (__libelf_u32_t)v);
    v >>= 32;
    __store_i32L(to + 4, (__libelf_u32_t)v);
}

void
_elf_store_i64M(unsigned char *to, __libelf_u64_t v) {
    __store_u32M(to + 4, (__libelf_u32_t)v);
    v >>= 32;
    __store_i32M(to, (__libelf_u32_t)v);
}

#endif /* __LIBELF64 */