/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
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*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
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/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
*
* File: architecture/i386/reg_help.h
* Author: Mike DeMoney, NeXT Computer, Inc.
* Modified for i386 by: Bruce Martin, NeXT Computer, Inc.
*
* This header file defines cpp macros useful for defining
* machine register and doing machine-level operations.
*
* HISTORY
* 10-Mar-92 Bruce Martin (bmartin@next.com)
* Adapted to i386
* 23-Jan-91 Mike DeMoney (mike@next.com)
* Created.
*/
#ifndef _ARCH_I386_REG_HELP_H_
#define _ARCH_I386_REG_HELP_H_
/* Bitfield definition aid */
#define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1)
#define BIT_WIDTH(pos) (1) /* mostly to record the position */
/* Mask creation */
#define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset))
#define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
#define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f)
/* Register addresses */
#if __ASSEMBLER__
# define REG_ADDR(type, addr) (addr)
#else /* __ASSEMBLER__ */
# define REG_ADDR(type, addr) (*(volatile type *)(addr))
#endif /* __ASSEMBLER__ */
/* Cast a register to be an unsigned */
#define CONTENTS(foo) (*(unsigned *) &(foo))
/* Stack pointer must always be a multiple of 4 */
#define STACK_INCR 4
#define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1))
/* STRINGIFY -- perform all possible substitutions, then stringify */
#define __STR(x) #x /* just a helper macro */
#define STRINGIFY(x) __STR(x)
/*
* REG_PAIR_DEF -- define a register pair
* Register pairs are appropriately aligned to allow access via
* ld.d and st.d.
*
* Usage:
* struct foo {
* REG_PAIR_DEF(
* bar_t *, barp,
* afu_t, afu
* );
* };
*
* Access to individual entries of the pair is via the REG_PAIR
* macro (below).
*/
#define REG_PAIR_DEF(type0, name0, type1, name1) \
struct { \
type0 name0 __attribute__(( aligned(8) )); \
type1 name1; \
} name0##_##name1
/*
* REG_PAIR -- Macro to define names for accessing individual registers
* of register pairs.
*
* Usage:
* arg0 is first element of pair
* arg1 is second element of pair
* arg2 is desired element of pair
* eg:
* #define foo_barp REG_PAIR(barp, afu, afu)
*/
#define REG_PAIR(name0, name1, the_name) \
name0##_##name1.the_name
#endif /* _ARCH_I386_REG_HELP_H_ */