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

     /*      $NetBSD: regdef.h,v 1.12 2005/12/11 12:18:09 christos Exp $     */
     
     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Ralph Campbell. This file is derived from the MIPS RISC
      * Architecture book by Gerry Kane.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)regdef.h    8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _MIPS_REGDEF_H
    #define _MIPS_REGDEF_H
    
    #include <machine/cdefs.h>      /* for API selection */
    
    #define zero    $0      /* always zero */
    #define AT      $at     /* assembler temporary */
    #define v0      $2      /* return value */
    #define v1      $3
    #define a0      $4      /* argument registers */
    #define a1      $5
    #define a2      $6
    #define a3      $7
    #if defined(__mips_n32) || defined(__mips_n64)
    #define a4      $8
    #define a5      $9
    #define a6      $10
    #define a7      $11
    #define t0      $12     /* temp registers (not saved across subroutine calls) */
    #define t1      $13
    #define t2      $14
    #define t3      $15
    #else
    #define t0      $8      /* temp registers (not saved across subroutine calls) */
    #define t1      $9
    #define t2      $10
    #define t3      $11
    #define t4      $12
    #define t5      $13
    #define t6      $14
    #define t7      $15
    #endif /* __mips_n32 || __mips_n64 */
    #define s0      $16     /* saved across subroutine calls (callee saved) */
    #define s1      $17
    #define s2      $18
    #define s3      $19
    #define s4      $20
    #define s5      $21
    #define s6      $22
    #define s7      $23
    #define t8      $24     /* two more temporary registers */
    #define t9      $25
    #define k0      $26     /* kernel temporary */
    #define k1      $27
    #define gp      $28     /* global pointer */
    #define sp      $29     /* stack pointer */
    #define s8      $30     /* one more callee saved */
    #define ra      $31     /* return address */
    
    /*
     * These are temp registers whose names can be used in either the old
     * or new ABI, although they map to different physical registers.  In
     * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
     *
     * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
     * should be used only when we need more than t0-t3.
     */
    #if defined(__mips_n32) || defined(__mips_n64)
    #define ta0     $8
    #define ta1     $9
    #define ta2     $10
   #define ta3     $11
   #else
   #define ta0     $12
   #define ta1     $13
   #define ta2     $14
   #define ta3     $15
   #endif /* __mips_n32 || __mips_n64 */
   
   #endif /* _MIPS_REGDEF_H */

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