111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
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/*
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* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
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*
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* File: architecture/i386/reg_help.h
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* Author: Mike DeMoney, NeXT Computer, Inc.
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* Modified for i386 by: Bruce Martin, NeXT Computer, Inc.
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*
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* This header file defines cpp macros useful for defining
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* machine register and doing machine-level operations.
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*
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* HISTORY
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* 10-Mar-92 Bruce Martin (bmartin@next.com)
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* Adapted to i386
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* 23-Jan-91 Mike DeMoney (mike@next.com)
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* Created.
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*/
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#ifndef _ARCH_I386_REG_HELP_H_
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#define _ARCH_I386_REG_HELP_H_
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/* Bitfield definition aid */
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#define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1)
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#define BIT_WIDTH(pos) (1) /* mostly to record the position */
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/* Mask creation */
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#define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset))
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#define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
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#define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f)
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/* Register addresses */
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#if __ASSEMBLER__
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# define REG_ADDR(type, addr) (addr)
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#else /* __ASSEMBLER__ */
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# define REG_ADDR(type, addr) (*(volatile type *)(addr))
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#endif /* __ASSEMBLER__ */
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/* Cast a register to be an unsigned */
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#define CONTENTS(foo) (*(unsigned *) &(foo))
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/* Stack pointer must always be a multiple of 4 */
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#define STACK_INCR 4
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#define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1))
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/* STRINGIFY -- perform all possible substitutions, then stringify */
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#define __STR(x) #x /* just a helper macro */
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#define STRINGIFY(x) __STR(x)
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/*
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* REG_PAIR_DEF -- define a register pair
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* Register pairs are appropriately aligned to allow access via
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* ld.d and st.d.
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*
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* Usage:
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* struct foo {
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* REG_PAIR_DEF(
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* bar_t *, barp,
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* afu_t, afu
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* );
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* };
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*
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* Access to individual entries of the pair is via the REG_PAIR
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* macro (below).
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*/
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#define REG_PAIR_DEF(type0, name0, type1, name1) \
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struct { \
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type0 name0 __attribute__(( aligned(8) )); \
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type1 name1; \
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} name0##_##name1
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/*
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* REG_PAIR -- Macro to define names for accessing individual registers
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* of register pairs.
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*
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* Usage:
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* arg0 is first element of pair
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* arg1 is second element of pair
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* arg2 is desired element of pair
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* eg:
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* #define foo_barp REG_PAIR(barp, afu, afu)
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*/
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#define REG_PAIR(name0, name1, the_name) \
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name0##_##name1.the_name
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#endif /* _ARCH_I386_REG_HELP_H_ */
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