sys/arch/mips/include/regdef.h

   1 /*      $NetBSD: regdef.h,v 1.10.6.3 2004/09/21 13:18:39 skrll 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. 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.
  22  *
  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
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)regdef.h    8.1 (Berkeley) 6/10/93
  36  */
  37
  38 #ifndef _MIPS_REGDEF_H
  39 #define _MIPS_REGDEF_H
  40
  41 #include <machine/cdefs.h>      /* for API selection */
  42
  43 #define zero    $0      /* always zero */
  44 #define AT      $at     /* assembler temporary */
  45 #define v0      $2      /* return value */
  46 #define v1      $3
  47 #define a0      $4      /* argument registers */
  48 #define a1      $5
  49 #define a2      $6
  50 #define a3      $7
  51 #if defined(__mips_n32) || defined(__mips_n64)
  52 #define a4      $8
  53 #define a5      $9
  54 #define a6      $10
  55 #define a7      $11
  56 #define t0      $12     /* temp registers (not saved across subroutine calls) */
  57 #define t1      $13
  58 #define t2      $14
  59 #define t3      $15
  60 #else
  61 #define t0      $8      /* temp registers (not saved across subroutine calls) */
  62 #define t1      $9
  63 #define t2      $10
  64 #define t3      $11
  65 #define t4      $12
  66 #define t5      $13
  67 #define t6      $14
  68 #define t7      $15
  69 #endif /* __mips_n32 || __mips_n64 */
  70 #define s0      $16     /* saved across subroutine calls (callee saved) */
  71 #define s1      $17
  72 #define s2      $18
  73 #define s3      $19
  74 #define s4      $20
  75 #define s5      $21
  76 #define s6      $22
  77 #define s7      $23
  78 #define t8      $24     /* two more temporary registers */
  79 #define t9      $25
  80 #define k0      $26     /* kernel temporary */
  81 #define k1      $27
  82 #define gp      $28     /* global pointer */
  83 #define sp      $29     /* stack pointer */
  84 #define s8      $30     /* one more callee saved */
  85 #define ra      $31     /* return address */
  86
  87 /*
  88  * These are temp registers whose names can be used in either the old
  89  * or new ABI, although they map to different physical registers.  In
  90  * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
  91  *
  92  * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
  93  * should be used only when we need more than t0-t3.
  94  */
  95 #if defined(__mips_n32) || defined(__mips_n64)
  96 #define ta0     $8
  97 #define ta1     $9
  98 #define ta2     $10
  99 #define ta3     $11
 100 #else
 101 #define ta0     $12
 102 #define ta1     $13
 103 #define ta2     $14
 104 #define ta3     $15
 105 #endif /* __mips_n32 || __mips_n64 */
 106
 107 #endif /* _MIPS_REGDEF_H */