| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ |
| | 5 | * |
| | 6 | * This file contains Original Code and/or Modifications of Original Code |
| | 7 | * as defined in and that are subject to the Apple Public Source License |
| | 8 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 9 | * compliance with the License. The rights granted to you under the |
| | 10 | * License may not be used to create, or enable the creation or |
| | 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating |
| | 12 | * system, or to circumvent, violate, or enable the circumvention or |
| | 13 | * violation of, any terms of an Apple operating system software license |
| | 14 | * agreement. |
| | 15 | * |
| | 16 | * Please obtain a copy of the License at |
| | 17 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 18 | * file. |
| | 19 | * |
| | 20 | * The Original Code and all software distributed under the License are |
| | 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 25 | * Please see the License for the specific language governing rights and |
| | 26 | * limitations under the License. |
| | 27 | * |
| | 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ |
| | 29 | */ |
| | 30 | /* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved. |
| | 31 | * |
| | 32 | * File: architecture/i386/reg_help.h |
| | 33 | * Author: Mike DeMoney, NeXT Computer, Inc. |
| | 34 | * Modified for i386 by: Bruce Martin, NeXT Computer, Inc. |
| | 35 | * |
| | 36 | * This header file defines cpp macros useful for defining |
| | 37 | * machine register and doing machine-level operations. |
| | 38 | * |
| | 39 | * HISTORY |
| | 40 | * 10-Mar-92 Bruce Martin (bmartin@next.com) |
| | 41 | * Adapted to i386 |
| | 42 | * 23-Jan-91 Mike DeMoney (mike@next.com) |
| | 43 | * Created. |
| | 44 | */ |
| | 45 | |
| | 46 | #ifndef _ARCH_I386_REG_HELP_H_ |
| | 47 | #define _ARCH_I386_REG_HELP_H_ |
| | 48 | |
| | 49 | /* Bitfield definition aid */ |
| | 50 | #define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1) |
| | 51 | #define BIT_WIDTH(pos) (1) /* mostly to record the position */ |
| | 52 | |
| | 53 | /* Mask creation */ |
| | 54 | #define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset)) |
| | 55 | #define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f) |
| | 56 | #define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f) |
| | 57 | |
| | 58 | /* Register addresses */ |
| | 59 | #if __ASSEMBLER__ |
| | 60 | # define REG_ADDR(type, addr) (addr) |
| | 61 | #else /* __ASSEMBLER__ */ |
| | 62 | # define REG_ADDR(type, addr) (*(volatile type *)(addr)) |
| | 63 | #endif /* __ASSEMBLER__ */ |
| | 64 | |
| | 65 | /* Cast a register to be an unsigned */ |
| | 66 | #define CONTENTS(foo) (*(unsigned *) &(foo)) |
| | 67 | |
| | 68 | /* Stack pointer must always be a multiple of 4 */ |
| | 69 | #define STACK_INCR 4 |
| | 70 | #define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1)) |
| | 71 | |
| | 72 | /* STRINGIFY -- perform all possible substitutions, then stringify */ |
| | 73 | #define __STR(x) #x /* just a helper macro */ |
| | 74 | #define STRINGIFY(x) __STR(x) |
| | 75 | |
| | 76 | /* |
| | 77 | * REG_PAIR_DEF -- define a register pair |
| | 78 | * Register pairs are appropriately aligned to allow access via |
| | 79 | * ld.d and st.d. |
| | 80 | * |
| | 81 | * Usage: |
| | 82 | * struct foo { |
| | 83 | * REG_PAIR_DEF( |
| | 84 | * bar_t *, barp, |
| | 85 | * afu_t, afu |
| | 86 | * ); |
| | 87 | * }; |
| | 88 | * |
| | 89 | * Access to individual entries of the pair is via the REG_PAIR |
| | 90 | * macro (below). |
| | 91 | */ |
| | 92 | #define REG_PAIR_DEF(type0, name0, type1, name1) \ |
| | 93 | struct { \ |
| | 94 | type0 name0 __attribute__(( aligned(8) )); \ |
| | 95 | type1 name1; \ |
| | 96 | } name0##_##name1 |
| | 97 | |
| | 98 | /* |
| | 99 | * REG_PAIR -- Macro to define names for accessing individual registers |
| | 100 | * of register pairs. |
| | 101 | * |
| | 102 | * Usage: |
| | 103 | * arg0 is first element of pair |
| | 104 | * arg1 is second element of pair |
| | 105 | * arg2 is desired element of pair |
| | 106 | * eg: |
| | 107 | * #define foo_barp REG_PAIR(barp, afu, afu) |
| | 108 | */ |
| | 109 | #define REG_PAIR(name0, name1, the_name) \ |
| | 110 | name0##_##name1.the_name |
| | 111 | |
| | 112 | #endif /* _ARCH_I386_REG_HELP_H_ */ |
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