1250136Simp/* $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $ */ 2250136Simp 3250134Simp/* 4250134Simp * Copyright (c) 1992, 1993 5250136Simp * The Regents of the University of California. All rights reserved. 6178172Simp * 7250134Simp * This code is derived from software contributed to Berkeley by 8250134Simp * Ralph Campbell. This file is derived from the MIPS RISC 9250134Simp * Architecture book by Gerry Kane. 10178172Simp * 11250134Simp * Redistribution and use in source and binary forms, with or without 12250134Simp * modification, are permitted provided that the following conditions 13250134Simp * are met: 14250134Simp * 1. Redistributions of source code must retain the above copyright 15250134Simp * notice, this list of conditions and the following disclaimer. 16250134Simp * 2. Redistributions in binary form must reproduce the above copyright 17250134Simp * notice, this list of conditions and the following disclaimer in the 18250134Simp * documentation and/or other materials provided with the distribution. 19250136Simp * 3. Neither the name of the University nor the names of its contributors 20250134Simp * may be used to endorse or promote products derived from this software 21250134Simp * without specific prior written permission. 22250134Simp * 23250134Simp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24250134Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25250134Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26250134Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27250134Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28250134Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29250134Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30250134Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31250134Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32250134Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33250134Simp * SUCH DAMAGE. 34250136Simp * 35250136Simp * @(#)regdef.h 8.1 (Berkeley) 6/10/93 36178172Simp * $FreeBSD$ 37178172Simp */ 38178172Simp 39250136Simp#ifndef _MIPS_REGDEF_H 40250136Simp#define _MIPS_REGDEF_H 41250135Simp 42250136Simp#include <machine/cdefs.h> /* for API selection */ 43250135Simp 44250136Simp#define zero $0 /* always zero */ 45250136Simp#define AT $at /* assembler temporary */ 46250136Simp#define v0 $2 /* return value */ 47250136Simp#define v1 $3 48250136Simp#define a0 $4 /* argument registers */ 49250136Simp#define a1 $5 50250136Simp#define a2 $6 51250136Simp#define a3 $7 52250136Simp#if defined(__mips_n32) || defined(__mips_n64) 53250136Simp#define a4 $8 54250136Simp#define a5 $9 55250136Simp#define a6 $10 56250136Simp#define a7 $11 57250136Simp#define t0 $12 /* temp registers (not saved across subroutine calls) */ 58250136Simp#define t1 $13 59250136Simp#define t2 $14 60250136Simp#define t3 $15 61250136Simp#else 62250136Simp#define t0 $8 /* temp registers (not saved across subroutine calls) */ 63250136Simp#define t1 $9 64250136Simp#define t2 $10 65250136Simp#define t3 $11 66250136Simp#define t4 $12 67250136Simp#define t5 $13 68250136Simp#define t6 $14 69250136Simp#define t7 $15 70250136Simp#endif /* __mips_n32 || __mips_n64 */ 71250136Simp#define s0 $16 /* saved across subroutine calls (callee saved) */ 72250136Simp#define s1 $17 73250136Simp#define s2 $18 74250136Simp#define s3 $19 75250136Simp#define s4 $20 76250136Simp#define s5 $21 77250136Simp#define s6 $22 78250136Simp#define s7 $23 79250136Simp#define t8 $24 /* two more temporary registers */ 80250136Simp#define t9 $25 81250136Simp#define k0 $26 /* kernel temporary */ 82250136Simp#define k1 $27 83250136Simp#define gp $28 /* global pointer */ 84250136Simp#define sp $29 /* stack pointer */ 85250136Simp#define s8 $30 /* one more callee saved */ 86250136Simp#define ra $31 /* return address */ 87250136Simp 88250136Simp/* 89250136Simp * These are temp registers whose names can be used in either the old 90250136Simp * or new ABI, although they map to different physical registers. In 91250136Simp * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7. 92250136Simp * 93250136Simp * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3 94250136Simp * should be used only when we need more than t0-t3. 95250136Simp */ 96250136Simp#if defined(__mips_n32) || defined(__mips_n64) 97250136Simp#define ta0 $8 98250136Simp#define ta1 $9 99250136Simp#define ta2 $10 100250136Simp#define ta3 $11 101250136Simp#else 102250136Simp#define ta0 $12 103250136Simp#define ta1 $13 104250136Simp#define ta2 $14 105250136Simp#define ta3 $15 106250136Simp#endif /* __mips_n32 || __mips_n64 */ 107250136Simp 108250136Simp#endif /* _MIPS_REGDEF_H */ 109