2008-11-08 17:27:50 +01:00
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/**************************************************************************
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* arch/sh/src/sh1/sh1_saveusercontext.S
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************/
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/**************************************************************************
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* Included Files
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**************************************************************************/
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#include <nuttx/irq.h>
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#include "up_internal.h"
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/**************************************************************************
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* Private Definitions
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**************************************************************************/
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/**************************************************************************
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* Private Types
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**************************************************************************/
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/**************************************************************************
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* Private Function Prototypes
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**************************************************************************/
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/**************************************************************************
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* Global Variables
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**************************************************************************/
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/**************************************************************************
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* Private Variables
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**************************************************************************/
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/**************************************************************************
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* Private Functions
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**************************************************************************/
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/**************************************************************************
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* Public Functions
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**************************************************************************/
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/**************************************************************************
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* Name: up_saveusercontext
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**************************************************************************/
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.text
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.globl _up_saveusercontext
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.type _up_saveusercontext, function
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_up_saveusercontext:
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/* On entry, R4 contains a reference to the register save structure
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* to populate.
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*
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* Save a nonzero value for R0 in the register save area. This will
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* will be the apparent return value when a context switch back to
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* this thread is performed.
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*/
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mov #1, r0
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mov.l r0, @r4
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/* Move to the end of the structure so that we can use auto decrement */
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add #(XCPTCONTEXT_SIZE-4), r0
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/* Save the necessary registers */
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stc sr, r0 /* Get and save the SR */
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mov.l r0, @-r4
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sts.l pr, @-r4 /* The return address is the restore PC */
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2008-11-11 01:41:22 +01:00
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add #-(10*4), r4 /* Skip over r0-r7, mach and macl */
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2008-11-08 17:27:50 +01:00
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mov.l r15, @-r4
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stc.l gbr, @-r4
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sts.l pr, @-r4
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mov.l r14, @-r4
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mov.l r13, @-r4
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mov.l r12, @-r4
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mov.l r11, @-r4
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mov.l r10, @-r4
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mov.l r9, @-r4
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mov.l r8, @-r4
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/* And return zero */
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rts
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mov #0, r0
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.size up_saveusercontext, . - up_saveusercontext
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.end
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