/*      $NetBSD: regdef.h,v 1.14 2020/07/26 08:08:41 simonb Exp $       */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell. This file is derived from the MIPS RISC
 * Architecture book by Gerry Kane.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)regdef.h    8.1 (Berkeley) 6/10/93
 */

#ifndef _MIPS_REGDEF_H
#define _MIPS_REGDEF_H

#include <machine/cdefs.h>      /* for API selection */

#define zero    $0      /* always zero */
#define AT      $at     /* assembler temporary */
#define v0      $2      /* return value */
#define v1      $3
#define a0      $4      /* argument registers */
#define a1      $5
#define a2      $6
#define a3      $7
#if defined(__mips_n32) || defined(__mips_n64)
#define a4      $8
#define a5      $9
#define a6      $10
#define a7      $11
#define t0      $12     /* temp registers (not saved across subroutine calls) */
#define t1      $13
#define t2      $14
#define t3      $15
#else
#define t0      $8      /* temp registers (not saved across subroutine calls) */
#define t1      $9
#define t2      $10
#define t3      $11
#define t4      $12
#define t5      $13
#define t6      $14
#define t7      $15
#endif /* __mips_n32 || __mips_n64 */
#define s0      $16     /* saved across subroutine calls (callee saved) */
#define s1      $17
#define s2      $18
#define s3      $19
#define s4      $20
#define s5      $21
#define s6      $22
#define s7      $23
#define t8      $24     /* two more temporary registers */
#define t9      $25
#define k0      $26     /* kernel temporary */
#define k1      $27
#define gp      $28     /* global pointer */
#define sp      $29     /* stack pointer */
#define s8      $30     /* one more callee saved */
#define ra      $31     /* return address */

/*
 * These are temp registers whose names can be used in either the old
 * or new ABI, although they map to different physical registers.  In
 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
 *
 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
 * should be used only when we need more than t0-t3.
 */
#if defined(__mips_n32) || defined(__mips_n64)
#define ta0     $8
#define ta1     $9
#define ta2     $10
#define ta3     $11
#else
#define ta0     $12
#define ta1     $13
#define ta2     $14
#define ta3     $15
#endif /* __mips_n32 || __mips_n64 */

#ifdef _KERNEL
#define MIPS_CURLWP     t8      /* needs to synced with cpu.h */
#endif

#endif /* _MIPS_REGDEF_H */