1/* $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $ */ 2 3/* 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Ralph Campbell. This file is derived from the MIPS RISC 11 * Architecture book by Gerry Kane. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)regdef.h 8.1 (Berkeley) 6/10/93 38 * $FreeBSD$ 39 */ 40 41#ifndef _MIPS_REGDEF_H 42#define _MIPS_REGDEF_H 43 44#include <machine/cdefs.h> /* for API selection */ 45 46#define zero $0 /* always zero */ 47#define AT $at /* assembler temporary */ 48#define v0 $2 /* return value */ 49#define v1 $3 50#define a0 $4 /* argument registers */ 51#define a1 $5 52#define a2 $6 53#define a3 $7 54#if defined(__mips_n32) || defined(__mips_n64) 55#define a4 $8 56#define a5 $9 57#define a6 $10 58#define a7 $11 59#define t0 $12 /* temp registers (not saved across subroutine calls) */ 60#define t1 $13 61#define t2 $14 62#define t3 $15 63#else 64#define t0 $8 /* temp registers (not saved across subroutine calls) */ 65#define t1 $9 66#define t2 $10 67#define t3 $11 68#define t4 $12 69#define t5 $13 70#define t6 $14 71#define t7 $15 72#endif /* __mips_n32 || __mips_n64 */ 73#define s0 $16 /* saved across subroutine calls (callee saved) */ 74#define s1 $17 75#define s2 $18 76#define s3 $19 77#define s4 $20 78#define s5 $21 79#define s6 $22 80#define s7 $23 81#define t8 $24 /* two more temporary registers */ 82#define t9 $25 83#define k0 $26 /* kernel temporary */ 84#define k1 $27 85#define gp $28 /* global pointer */ 86#define sp $29 /* stack pointer */ 87#define s8 $30 /* one more callee saved */ 88#define ra $31 /* return address */ 89 90/* 91 * These are temp registers whose names can be used in either the old 92 * or new ABI, although they map to different physical registers. In 93 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7. 94 * 95 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3 96 * should be used only when we need more than t0-t3. 97 */ 98#if defined(__mips_n32) || defined(__mips_n64) 99#define ta0 $8 100#define ta1 $9 101#define ta2 $10 102#define ta3 $11 103#else 104#define ta0 $12 105#define ta1 $13 106#define ta2 $14 107#define ta3 $15 108#endif /* __mips_n32 || __mips_n64 */ 109 110#endif /* _MIPS_REGDEF_H */ 111