text: /****************************************************************************
   * arch/arm/src/armv7-a/arm_copyarmstate.c
   *
   *   Copyright (C) 2013 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  
  #include <arch/irq.h>
  
  #include "arm_internal.h"
  
  #ifdef CONFIG_ARCH_FPU
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: arm_copyarmstate
   *
   * Description:
   *    Copy the ARM portion of the register save area (omitting the floating
   *    point registers) and save the floating pointer register directly.
   *
   ****************************************************************************/
  
  void arm_copyarmstate(uint32_t *dest, uint32_t *src)
  {
    int i;
  
    /* In the Cortex-A model, the state is copied from the stack to the TCB,
     * but only a reference is passed to get the state from the TCB.  So the
     * following check avoids copying the TCB save area onto itself:
     */
  
    if (src != dest)
      {
        /* Save the floating point registers: This will initialize the floating
         * registers at indices ARM_CONTEXT_REGS through (XCPTCONTEXT_REGS-1)
         */
  
        arm_savefpu(dest);
  
        /* Then copy all of the ARM registers (omitting the floating point
         * registers).  Indices: 0 through (ARM_CONTEXT_REGS-1).
         */
  
        for (i = 0; i < ARM_CONTEXT_REGS; i++)
          {
            *dest++ = *src++;
          }
      }
  }
  
  #endif /* CONFIG_ARCH_FPU */
  