1 /* $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software contributed to Berkeley by
10 * Ralph Campbell. This file is derived from the MIPS RISC
11 * Architecture book by Gerry Kane.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)regdef.h 8.1 (Berkeley) 6/10/93
41 #ifndef _MIPS_REGDEF_H
42 #define _MIPS_REGDEF_H
44 #include <machine/cdefs.h> /* for API selection */
46 #define zero $0 /* always zero */
47 #define AT $at /* assembler temporary */
48 #define v0 $2 /* return value */
50 #define a0 $4 /* argument registers */
54 #if defined(__mips_n32) || defined(__mips_n64)
59 #define t0 $12 /* temp registers (not saved across subroutine calls) */
64 #define t0 $8 /* temp registers (not saved across subroutine calls) */
72 #endif /* __mips_n32 || __mips_n64 */
73 #define s0 $16 /* saved across subroutine calls (callee saved) */
81 #define t8 $24 /* two more temporary registers */
83 #define k0 $26 /* kernel temporary */
85 #define gp $28 /* global pointer */
86 #define sp $29 /* stack pointer */
87 #define s8 $30 /* one more callee saved */
88 #define ra $31 /* return address */
91 * These are temp registers whose names can be used in either the old
92 * or new ABI, although they map to different physical registers. In
93 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
95 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
96 * should be used only when we need more than t0-t3.
98 #if defined(__mips_n32) || defined(__mips_n64)
108 #endif /* __mips_n32 || __mips_n64 */
110 #endif /* _MIPS_REGDEF_H */