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/**************************************************************************
* arch/sh/src/sh1/sh1_saveusercontext.S
*
* Copyright (C) 2008, 2009 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/irq.h>
#include "up_internal.h"
/**************************************************************************
* Pre-processor Definitions
**************************************************************************/
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_saveusercontext
**************************************************************************/
.text
.globl _up_saveusercontext
.type _up_saveusercontext, function
_up_saveusercontext:
/* On entry, R4 contains a reference to the register save structure
* to populate.
*
* Re-position to the end of the structure (+4_ so that we can use
* auto decrement
*/
add #(XCPTCONTEXT_SIZE), r4 /* R4: Address of last entry + 4 */
/* Save the necessary registers */
stc sr, r0 /* Get and save the SR */
mov.l r0, @-r4
sts.l pr, @-r4 /* The return address is the restore PC */
add #-(7*4), r4 /* Skip over r4, r7-r1. R4 points at R1 storage */
/* Save a nonzero value for R0 in the register save area. This will
* will be the apparent return value when a context switch back to
* this thread is performed.
*/
mov #1, r0 /* Save R0=1 (return value) */
mov.l r0, @-r4
add #-(2*4), r4 /* Skip over mach and macl. R4 points at R15 storage. */
mov.l r15, @-r4 /* SP */
stc.l gbr, @-r4 /* GBR & PR */
sts.l pr, @-r4
mov.l r14, @-r4 /* R14-R8 */
mov.l r13, @-r4
mov.l r12, @-r4
mov.l r11, @-r4
mov.l r10, @-r4
mov.l r9, @-r4
mov.l r8, @-r4
/* And return zero */
rts
mov #0, r0
.size up_saveusercontext, . - up_saveusercontext
.end
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