text: /****************************************************************************
   * arch/mips/include/mips32/registers.h
   *
   *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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 NuttX 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 COPYRIGHT HOLDERS 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
   * COPYRIGHT OWNER 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.
   *
   ****************************************************************************/
  
  #ifndef __ARCH_MIPS_INCLUDE_MIPS32_REGISTERS_H
  #define __ARCH_MIPS_INCLUDE_MIPS32_REGISTERS_H
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /* Standard synonmyms for MIPS registers */
  
  #ifdef __ASSEMBLY__
  /* Zero register:  Always returns 0 */
  
  #define zero               $0
  
  /* Assembler temporary register:  Reserved for use by the assembler */
  
  #define at_reg             $1
  
  /* Return value registers:  Value returned by function */
  
  #define v0                 $2
  #define v1                 $3
  
  /* Argument registers:  First four parameters to a function */
  
  #define a0                 $4
  #define a1                 $5
  #define a2                 $6
  #define a3                 $7
  
  /* Volatile registers: Registers that can be used without saving */
  
  #define t0                 $8
  #define t1                 $9
  #define t2                 $10
  #define t3                 $11
  #define t4                 $12
  #define t5                 $13
  #define t6                 $14
  #define t7                 $15
  #define t8                 $24
  #define t9                 $25
  
  /* Static registers:  Registers that must be saved and restored if used */
  
  #define s0                 $16
  #define s1                 $17
  #define s2                 $18
  #define s3                 $19
  #define s4                 $20
  #define s5                 $21
  #define s6                 $22
  #define s7                 $23
  
  /* Reserved for use by interrupt/trap handling logic */
  
  #define k0                 $26
  #define k1                 $27
  
  /* Global pointer register */
  
  #define gp                 $28
  
  /* Stack pointer register:  Stack pointer */
  
  #define sp                 $29
  
  /* Register 30 may be either an additional static register or a frame pointer */
  
  #define s8                 $30
  #define fp                 $30
  
  /* Return address register:  Contains the function return address */
  
  #define ra                 $31
  #endif
  
  /****************************************************************************
   * Public Types
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Public Function Prototypes
   ****************************************************************************/
  
  #ifndef __ASSEMBLY__
  #ifdef __cplusplus
  #define EXTERN extern "C"
  extern "C"
  {
  #else
  #define EXTERN extern
  #endif
  
  #undef EXTERN
  #ifdef __cplusplus
  }
  #endif
  #endif
  
  #endif /* __ARCH_MIPS_INCLUDE_MIPS32_REGISTERS_H */
  