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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 # define REG_ADDR(type, addr) (*(volatile type *)(addr)) #endif /* 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
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.