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