The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/include/regdef.h

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    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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