1 /* $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)regdef.h 8.1 (Berkeley) 6/10/93
39 #ifndef _MIPS_REGDEF_H
40 #define _MIPS_REGDEF_H
42 #include <machine/cdefs.h> /* for API selection */
44 #define zero $0 /* always zero */
45 #define AT $at /* assembler temporary */
46 #define v0 $2 /* return value */
48 #define a0 $4 /* argument registers */
52 #if defined(__mips_n32) || defined(__mips_n64)
57 #define t0 $12 /* temp registers (not saved across subroutine calls) */
62 #define t0 $8 /* temp registers (not saved across subroutine calls) */
70 #endif /* __mips_n32 || __mips_n64 */
71 #define s0 $16 /* saved across subroutine calls (callee saved) */
79 #define t8 $24 /* two more temporary registers */
81 #define k0 $26 /* kernel temporary */
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 */
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.
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.
96 #if defined(__mips_n32) || defined(__mips_n64)
106 #endif /* __mips_n32 || __mips_n64 */
108 #endif /* _MIPS_REGDEF_H */