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/**************************************************************************
* up_savecontext.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 <sys/types.h>
#include <nuttx/irq.h>
#include "up_internal.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_pushcontext
*
* Description:
* Push the current execution context onto the before the stack. Similar
* operations are executed from the interrupt state save.
*
* Inputs:
* None
*
* Return:
* Returns the stack pointer (always non-zero). However, when
* up_popcontext() executes, it will appear as a return from this
* function with return value == 0
*
**************************************************************************/
static ubyte up_pushcontext(void) __naked
{
/* Push the current execution context onto the stack. */
_asm
push acc
push ie
mov dptr, #0 /* Save return value (dpl) = 0 */
push dpl
push dph
push b
push ar2
push ar3
push ar4
push ar5
push ar6
push ar7
push ar0
push ar1
push psw
clr psw
push _bp
/* And return the current stack pointer value in dpl */
mov dpl, sp
ret
_endasm;
}
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_savecontext
*
* Description:
* Push the current execution context onto the stack, then save the
* entire stack contents in the provided context structure.
*
* Inputs:
* context - the context structure in which to save the stack info
*
* Return:
* 0 = Normal state save return
* 1 = This is the matching return from up_restorecontext()
*
**************************************************************************/
ubyte up_savecontext(FAR struct xcptcontext *context)
{
irqstate_t flags = irqsave();
ubyte sp = up_pushcontext();
if (sp)
{
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
ubyte nbytes = sp - (STACK_BASE-1);
FAR ubyte *src = (FAR ubyte*)STACK_BASE;
FAR ubyte *dest = context->stack;
/* Then copy the stack info into the context structure */
context->nbytes = nbytes;
while (nbytes--)
{
*dest++ = *src++;
}
/* Return zero so that the return behavior is similar to setjmp */
irqrestore(flags);
return 0;
}
/* Return one so that the return behavior is similar to setjmp */
irqrestore(flags);
return 1;
}
/**************************************************************************
* Name: up_savestack
*
* Description:
* Save the entire interrupt stack contents in the provided context
* structure.
*
* Inputs:
* context - the context structure in which to save the stack info
*
* Return:
* None
*
* Assumptions:
* - We are in an interrupt handler with g_irqtos set
* - Interrupts are disabled
*
**************************************************************************/
void up_savestack(FAR struct xcptcontext *context)
{
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
ubyte nbytes = g_irqtos - (STACK_BASE-1);
FAR ubyte *src = (FAR ubyte*)STACK_BASE;
FAR ubyte *dest = context->stack;
context->nbytes = nbytes;
while (nbytes--)
{
*dest++ = *src++;
}
}
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