1 /* $NetBSD: regdef.h,v 1.10 2002/11/04 03:38:32 thorpej 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)regdef.h 8.1 (Berkeley) 6/10/93 40 */ 41 42 #ifndef _MIPS_REGDEF_H 43 #define _MIPS_REGDEF_H 44 45 #include <machine/cdefs.h> /* for API selection */ 46 47 #define zero $0 /* always zero */ 48 #define AT $at /* assembler temporary */ 49 #define v0 $2 /* return value */ 50 #define v1 $3 51 #define a0 $4 /* argument registers */ 52 #define a1 $5 53 #define a2 $6 54 #define a3 $7 55 #if defined(__mips_n32) || defined(__mips_n64) 56 #define a4 $8 57 #define a5 $9 58 #define a6 $10 59 #define a7 $11 60 #define t0 $12 /* temp registers (not saved across subroutine calls) */ 61 #define t1 $13 62 #define t2 $14 63 #define t3 $15 64 #else 65 #define t0 $8 /* temp registers (not saved across subroutine calls) */ 66 #define t1 $9 67 #define t2 $10 68 #define t3 $11 69 #define t4 $12 70 #define t5 $13 71 #define t6 $14 72 #define t7 $15 73 #endif /* __mips_n32 || __mips_n64 */ 74 #define s0 $16 /* saved across subroutine calls (callee saved) */ 75 #define s1 $17 76 #define s2 $18 77 #define s3 $19 78 #define s4 $20 79 #define s5 $21 80 #define s6 $22 81 #define s7 $23 82 #define t8 $24 /* two more temporary registers */ 83 #define t9 $25 84 #define k0 $26 /* kernel temporary */ 85 #define k1 $27 86 #define gp $28 /* global pointer */ 87 #define sp $29 /* stack pointer */ 88 #define s8 $30 /* one more callee saved */ 89 #define ra $31 /* return address */ 90 91 /* 92 * These are temp registers whose names can be used in either the old 93 * or new ABI, although they map to different physical registers. In 94 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7. 95 * 96 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3 97 * should be used only when we need more than t0-t3. 98 */ 99 #if defined(__mips_n32) || defined(__mips_n64) 100 #define ta0 $8 101 #define ta1 $9 102 #define ta2 $10 103 #define ta3 $11 104 #else 105 #define ta0 $12 106 #define ta1 $13 107 #define ta2 $14 108 #define ta3 $15 109 #endif /* __mips_n32 || __mips_n64 */ 110 111 #endif /* _MIPS_REGDEF_H */ 112