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 */