c42c9f4aef
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5 42af7a65-404d-4744-a932-0658087f49c3
120 lines
4.4 KiB
ArmAsm
120 lines
4.4 KiB
ArmAsm
/**************************************************************************
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* up_saveusercontext.S
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*
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* Copyright (C) 2007 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 Gregory Nutt 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, a1 (r0) holds address of struct xcptcontext.
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* Offset to the user region.
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*/
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/* Make sure that the return value will be non-zero (the
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* value of the other volatile registers don't matter --
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* r1-r3, ip). This function is called throught the
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* noraml C calling conventions and the values of these
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* registers cannot be assumed at the point of setjmp
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* return.
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*/
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mov ip, #1
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str ip, [r0, #(4*REG_R0)]
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/* Save the volatile registers (plus r12 which really
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* doesn't need to be saved)
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*/
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add r1, r0, #(4*REG_R4)
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stmia r1, {r4-r14}
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/* Save the current cpsr */
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mrs r2, cpsr /* R3 = CPSR value */
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add r1, r0, #(4*REG_CPSR)
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str r2, [r1]
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/* Finally save the return address as the PC so that we
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* return to the exit from this function.
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*/
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add r1, r0, #(4*REG_PC)
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str lr, [r1]
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/* Return 0 */
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mov r0, #0 /* Return value == 0 */
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mov pc, lr /* Return */
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.size up_saveusercontext, . - up_saveusercontext
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