257 lines
7 KiB
C
257 lines
7 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 _ENDIAN_H_
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#define _ENDIAN_H_
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/* C byte conversion functions */
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extern unsigned_1 endian_h2t_1(unsigned_1 x);
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extern unsigned_2 endian_h2t_2(unsigned_2 x);
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extern unsigned_4 endian_h2t_4(unsigned_4 x);
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extern unsigned_8 endian_h2t_8(unsigned_8 x);
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extern unsigned_1 endian_t2h_1(unsigned_1 x);
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extern unsigned_2 endian_t2h_2(unsigned_2 x);
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extern unsigned_4 endian_t2h_4(unsigned_4 x);
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extern unsigned_8 endian_t2h_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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/* INSERT HERE - additional hosts that do not have LITTLE_ENDIAN and
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BIG_ENDIAN definitions available. */
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/* SWAPPING:
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According to the following table:
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TARG BE TARG LE TARG ??
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HOST BE ok s/w s/w
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HOST LE htohl ok ok|ntohl
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HOST ?? ntohl s/w s/w
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define host <-> target byte order conversion macro's */
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/* IN PLACE:
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These macro's given a variable argument swap its value in place if
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so 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_64BIT_TARGET
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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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#else
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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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/* 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 0
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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 ? (X) : endian_h2t_8(X))
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#define H2T_4(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : htonl(X))
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#define H2T_2(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : htons(X))
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#define H2T_1(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : (X))
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#define T2H_8(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : endian_t2h_8(X))
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#define T2H_4(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : htonl(X))
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#define T2H_2(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : htons(X))
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#define T2H_1(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : (X))
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#endif
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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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#endif
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