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/**************************************************************************
* up_restorecontext.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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/irq.h>
#include "up_internal.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_popcontext
*
* Description:
* Pop the current execution context from the stack and return to the
* execution context. Similar operations are executed from the interrupt
* state restore
*
* Inputs:
* None
*
* Return:
* This function does not return
*
**************************************************************************/
static void up_popcontext(ubyte newsp) __naked
{
_asm
pop _bp
pop psw
pop ar1
pop ar0
pop ar7
pop ar6
pop ar5
pop ar4
pop ar3
pop ar2
pop b
pop dph
pop dpl
/* Restore the interrupt state per the stored IE value */
pop acc
jb acc.7,00001$
clr ie.7
sjmp 00002$
00001$:
setb ie.7
00002$:
pop acc
ret
_endasm;
}
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_restorecontext
*
* Description:
* Restore the stack specified in the context structure and return to
* that context
*
* Inputs:
* context - Holds the stack content of the context to return to
*
* Return:
* This function does not return.
*
**************************************************************************/
void up_restorecontext(FAR struct xcptcontext *context)
{
int nbytes = context->nbytes;
FAR ubyte *src = context->stack;
FAR ubyte *dest = (FAR ubyte*)STACK_BASE;
/* Interrupts should be disabled for the following. up_popcontext() will
* set the new interrupt state correctly.
*/
(void)irqsave();
while (nbytes--)
{
*src++ = *dest++;
}
/* Then return to the restored context */
up_popcontext(context->nbytes + (STACK_BASE-1));
}
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