1/* $NetBSD: regdef.h,v 1.14 2020/07/26 08:08:41 simonb 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 */ 37 38#ifndef _MIPS_REGDEF_H 39#define _MIPS_REGDEF_H 40 41#include <machine/cdefs.h> /* for API selection */ 42 43#define zero $0 /* always zero */ 44#define AT $at /* assembler temporary */ 45#define v0 $2 /* return value */ 46#define v1 $3 47#define a0 $4 /* argument registers */ 48#define a1 $5 49#define a2 $6 50#define a3 $7 51#if defined(__mips_n32) || defined(__mips_n64) 52#define a4 $8 53#define a5 $9 54#define a6 $10 55#define a7 $11 56#define t0 $12 /* temp registers (not saved across subroutine calls) */ 57#define t1 $13 58#define t2 $14 59#define t3 $15 60#else 61#define t0 $8 /* temp registers (not saved across subroutine calls) */ 62#define t1 $9 63#define t2 $10 64#define t3 $11 65#define t4 $12 66#define t5 $13 67#define t6 $14 68#define t7 $15 69#endif /* __mips_n32 || __mips_n64 */ 70#define s0 $16 /* saved across subroutine calls (callee saved) */ 71#define s1 $17 72#define s2 $18 73#define s3 $19 74#define s4 $20 75#define s5 $21 76#define s6 $22 77#define s7 $23 78#define t8 $24 /* two more temporary registers */ 79#define t9 $25 80#define k0 $26 /* kernel temporary */ 81#define k1 $27 82#define gp $28 /* global pointer */ 83#define sp $29 /* stack pointer */ 84#define s8 $30 /* one more callee saved */ 85#define ra $31 /* return address */ 86 87/* 88 * These are temp registers whose names can be used in either the old 89 * or new ABI, although they map to different physical registers. In 90 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7. 91 * 92 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3 93 * should be used only when we need more than t0-t3. 94 */ 95#if defined(__mips_n32) || defined(__mips_n64) 96#define ta0 $8 97#define ta1 $9 98#define ta2 $10 99#define ta3 $11 100#else 101#define ta0 $12 102#define ta1 $13 103#define ta2 $14 104#define ta3 $15 105#endif /* __mips_n32 || __mips_n64 */ 106 107#ifdef _KERNEL 108#define MIPS_CURLWP t8 /* needs to synced with cpu.h */ 109#endif 110 111#endif /* _MIPS_REGDEF_H */ 112