316 lines
8.5 KiB
C
316 lines
8.5 KiB
C
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/* This file is part of the program psim.
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Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _SIM_ENDIAN_H_
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#define _SIM_ENDIAN_H_
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#ifndef INLINE_SIM_ENDIAN
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#define INLINE_SIM_ENDIAN
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#endif
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/* C byte conversion functions */
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INLINE_SIM_ENDIAN unsigned_1 endian_h2t_1(unsigned_1 x);
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INLINE_SIM_ENDIAN unsigned_2 endian_h2t_2(unsigned_2 x);
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INLINE_SIM_ENDIAN unsigned_4 endian_h2t_4(unsigned_4 x);
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INLINE_SIM_ENDIAN unsigned_8 endian_h2t_8(unsigned_8 x);
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INLINE_SIM_ENDIAN unsigned_1 endian_t2h_1(unsigned_1 x);
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INLINE_SIM_ENDIAN unsigned_2 endian_t2h_2(unsigned_2 x);
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INLINE_SIM_ENDIAN unsigned_4 endian_t2h_4(unsigned_4 x);
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INLINE_SIM_ENDIAN unsigned_8 endian_t2h_8(unsigned_8 x);
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INLINE_SIM_ENDIAN unsigned_1 swap_1(unsigned_1 x);
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INLINE_SIM_ENDIAN unsigned_2 swap_2(unsigned_2 x);
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INLINE_SIM_ENDIAN unsigned_4 swap_4(unsigned_4 x);
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INLINE_SIM_ENDIAN unsigned_8 swap_8(unsigned_8 x);
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/* Host dependant:
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The CPP below defines information about the compilation host. In
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particular it defines the macro's:
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WITH_HOST_BYTE_ORDER The byte order of the host. Could
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be any of LITTLE_ENDIAN, BIG_ENDIAN
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or 0 (unknown). Those macro's also
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need to be defined.
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WITH_NTOH Network byte order macros defined.
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Possible value is 32 or (maybe one
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day 64 because some 64bit network
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byte order macro is defined.
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*/
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/* NetBSD:
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NetBSD is easy, everything you could ever want is in a header file
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(well almost :-) */
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#if defined(__NetBSD__)
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# include <machine/endian.h>
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# define WITH_NTOH 32 /* what about alpha? */
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# if (WITH_HOST_BYTE_ORDER == 0)
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# undef WITH_HOST_BYTE_ORDER
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# define WITH_HOST_BYTE_ORDER BYTE_ORDER
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# endif
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# if (BYTE_ORDER != WITH_HOST_BYTE_ORDER)
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# error "host endian incorrectly configured, check config.h"
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# endif
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#endif
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/* Linux is similarly easy. */
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#if defined(__linux__)
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# include <endian.h>
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# include <asm/byteorder.h>
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# if defined(__LITTLE_ENDIAN) && !defined(LITTLE_ENDIAN)
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# define LITTLE_ENDIAN __LITTLE_ENDIAN
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# endif
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# if defined(__BIG_ENDIAN) && !defined(BIG_ENDIAN)
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# define BIG_ENDIAN __BIG_ENDIAN
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# endif
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# if defined(__BYTE_ORDER) && !defined(BYTE_ORDER)
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# define BYTE_ORDER __BYTE_ORDER
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# endif
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# if !defined(__alpha__)
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# define WITH_NTOH 32 /* what about alpha? */
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# endif
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# if (WITH_HOST_BYTE_ORDER == 0)
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# undef WITH_HOST_BYTE_ORDER
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# define WITH_HOST_BYTE_ORDER BYTE_ORDER
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# endif
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# if (BYTE_ORDER != WITH_HOST_BYTE_ORDER)
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# error "host endian incorrectly configured, check config.h"
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# endif
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#endif
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/* INSERT HERE - hosts that have available LITTLE_ENDIAN and
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BIG_ENDIAN macro's */
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/* Some hosts don't define LITTLE_ENDIAN or BIG_ENDIAN, help them out */
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN 1234
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#endif
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN 4321
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#endif
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/* SunOS on SPARC:
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Big endian last time I looked */
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#if defined(sparc) || defined(__sparc__)
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# if (WITH_HOST_BYTE_ORDER == 0)
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# undef WITH_HOST_BYTE_ORDER
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# define WITH_HOST_BYTE_ORDER BIG_ENDIAN
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# endif
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# if (WITH_HOST_BYTE_ORDER != BIG_ENDIAN)
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# error "sun was big endian last time I looked ..."
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# endif
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#endif
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/* Random x86
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Little endian last time I looked */
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#if defined(i386) || defined(i486) || defined(i586) || defined(__i386__) || defined(__i486__) || defined(__i586__)
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# if (WITH_HOST_BYTE_ORDER == 0)
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# undef WITH_HOST_BYTE_ORDER
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# define WITH_HOST_BYTE_ORDER LITTLE_ENDIAN
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# endif
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# if (WITH_HOST_BYTE_ORDER != LITTLE_ENDIAN)
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# error "x86 was little endian last time I looked ..."
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# endif
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#endif
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#if (defined (__i486__) || defined (__i586__)) && defined(__GNUC__) && WITH_BSWAP && WITH_NTOH
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#undef htonl
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#undef ntohl
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#define htonl(IN) __extension__ ({ int _out; __asm__ ("bswap %0" : "=r" (_out) : "0" (IN)); _out; })
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#define ntohl(IN) __extension__ ({ int _out; __asm__ ("bswap %0" : "=r" (_out) : "0" (IN)); _out; })
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#endif
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/* Configure defines WORDS_BIGENDIAN if the host is big endian. */
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#if (WITH_HOST_BYTE_ORDER == 0)
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# undef WITH_HOST_BYTE_ORDER
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# ifdef WORDS_BIGENDIAN
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# define WITH_HOST_BYTE_ORDER BIG_ENDIAN
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# else
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# define WITH_HOST_BYTE_ORDER LITTLE_ENDIAN
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# endif
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#endif
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/* SWAP:
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Some times a swap must always be performed, select the most
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effecient method to swap a collection of bytes.
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HOST BE sw
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HOST LE sw/ntoh
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HOST ?? sw
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*/
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#if (WITH_HOST_BYTE_ORDER \
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&& WITH_NTOH \
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&& WITH_HOST_BYTE_ORDER == LITTLE_ENDIAN)
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#define SWAP_1(X) (X)
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#define SWAP_2(X) ntohs(X)
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#define SWAP_4(X) ntohl(X)
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#define SWAP_8(X) swap_8(X)
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#else
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#define SWAP_1(X) (X)
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#define SWAP_2(X) swap_2(X)
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#define SWAP_4(X) swap_4(X)
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#define SWAP_8(X) swap_8(X)
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#endif
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/* CONVERSION:
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Convert between host and target byte orders by the most efficient
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method known (if needed at all)
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TARG BE TARG LE TARG ??
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HOST BE ok swap swap
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HOST LE htohl ok ok|ntohl
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HOST ?? ntohl swap swap
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*/
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/* FUNCTIONS:
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Returns the value swapped according to the host/target byte order */
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/* no need to swap */
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#if (WITH_HOST_BYTE_ORDER \
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&& WITH_TARGET_BYTE_ORDER \
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&& WITH_HOST_BYTE_ORDER == WITH_TARGET_BYTE_ORDER )
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#define H2T_1(X) (X)
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#define H2T_2(X) (X)
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#define H2T_4(X) (X)
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#define H2T_8(X) (X)
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#define T2H_1(X) (X)
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#define T2H_2(X) (X)
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#define T2H_4(X) (X)
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#define T2H_8(X) (X)
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#endif
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/* have ntoh and big endian target */
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#if (WITH_TARGET_BYTE_ORDER == BIG_ENDIAN \
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&& WITH_HOST_BYTE_ORDER != BIG_ENDIAN \
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&& WITH_NTOH)
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#define H2T_8(X) endian_h2t_8(X)
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#define H2T_4(X) htonl(X)
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#define H2T_2(X) htons(X)
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#define H2T_1(X) (X)
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#define T2H_8(X) endian_t2h_8(X)
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#define T2H_4(X) htonl(X)
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#define T2H_2(X) htons(X)
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#define T2H_1(X) (X)
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#endif
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/* have ntoh, little host and unknown target */
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#if (WITH_HOST_BYTE_ORDER == LITTLE_ENDIAN \
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&& WITH_TARGET_BYTE_ORDER == 0 \
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&& WITH_NTOH)
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#define H2T_8(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : endian_h2t_8(X))
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#define H2T_4(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : htonl(X))
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#define H2T_2(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : htons(X))
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#define H2T_1(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : (X))
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#define T2H_8(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : endian_t2h_8(X))
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#define T2H_4(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : htonl(X))
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#define T2H_2(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : htons(X))
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#define T2H_1(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER \
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? (X) : (X))
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#endif
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/* if all else fails use software */
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#ifndef H2T_1
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#define H2T_1(X) (X)
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#define H2T_2(X) endian_h2t_2(X)
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#define H2T_4(X) endian_h2t_4(X)
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#define H2T_8(X) endian_h2t_8(X)
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#define T2H_1(X) (X)
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#define T2H_2(X) endian_t2h_2(X)
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#define T2H_4(X) endian_t2h_4(X)
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#define T2H_8(X) endian_t2h_8(X)
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#endif
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/* CONVERT IN PLACE:
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These macros, given an argument of unknown size, swap its value in
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place if a host/target conversion is required. */
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#define H2T(VARIABLE) \
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do { \
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switch (sizeof(VARIABLE)) { \
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case 1: VARIABLE = H2T_1(VARIABLE); break; \
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case 2: VARIABLE = H2T_2(VARIABLE); break; \
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case 4: VARIABLE = H2T_4(VARIABLE); break; \
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case 8: VARIABLE = H2T_8(VARIABLE); break; \
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} \
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} while (0)
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#define T2H(VARIABLE) \
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do { \
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switch (sizeof(VARIABLE)) { \
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case 1: VARIABLE = T2H_1(VARIABLE); break; \
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case 2: VARIABLE = T2H_2(VARIABLE); break; \
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case 4: VARIABLE = T2H_4(VARIABLE); break; \
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case 8: VARIABLE = T2H_8(VARIABLE); break; \
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} \
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} while (0)
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/* TARGET WORD:
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Byte swap a quantity the size of the targets word */
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#if (WITH_TARGET_WORD_BITSIZE == 64)
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#define H2T_word(X) H2T_8(X)
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#define T2H_word(X) T2H_8(X)
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#endif
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#if (WITH_TARGET_WORD_BITSIZE == 32)
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#define H2T_word(X) H2T_4(X)
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#define T2H_word(X) T2H_4(X)
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#endif
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#endif /* _SIM_ENDIAN_H_ */
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