1 /* $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $ */
2
3 /*
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
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.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
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.
24 *
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
35 * SUCH DAMAGE.
36 *
37 * @(#)regdef.h 8.1 (Berkeley) 6/10/93
38 * $FreeBSD$
39 */
40
41 #ifndef _MIPS_REGDEF_H
42 #define _MIPS_REGDEF_H
43
44 #include <machine/cdefs.h> /* for API selection */
45
46 #define zero $0 /* always zero */
47 #define AT $at /* assembler temporary */
48 #define v0 $2 /* return value */
49 #define v1 $3
50 #define a0 $4 /* argument registers */
51 #define a1 $5
52 #define a2 $6
53 #define a3 $7
54 #if defined(__mips_n32) || defined(__mips_n64)
55 #define a4 $8
56 #define a5 $9
57 #define a6 $10
58 #define a7 $11
59 #define t0 $12 /* temp registers (not saved across subroutine calls) */
60 #define t1 $13
61 #define t2 $14
62 #define t3 $15
63 #else
64 #define t0 $8 /* temp registers (not saved across subroutine calls) */
65 #define t1 $9
66 #define t2 $10
67 #define t3 $11
68 #define t4 $12
69 #define t5 $13
70 #define t6 $14
71 #define t7 $15
72 #endif /* __mips_n32 || __mips_n64 */
73 #define s0 $16 /* saved across subroutine calls (callee saved) */
74 #define s1 $17
75 #define s2 $18
76 #define s3 $19
77 #define s4 $20
78 #define s5 $21
79 #define s6 $22
80 #define s7 $23
81 #define t8 $24 /* two more temporary registers */
82 #define t9 $25
83 #define k0 $26 /* kernel temporary */
84 #define k1 $27
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 */
89
90 /*
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.
94 *
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.
97 */
98 #if defined(__mips_n32) || defined(__mips_n64)
99 #define ta0 $8
100 #define ta1 $9
101 #define ta2 $10
102 #define ta3 $11
103 #else
104 #define ta0 $12
105 #define ta1 $13
106 #define ta2 $14
107 #define ta3 $15
108 #endif /* __mips_n32 || __mips_n64 */
109
110 #endif /* _MIPS_REGDEF_H */
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