16f6bb5dc5
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@9 42af7a65-404d-4744-a932-0658087f49c3
118 lines
4.7 KiB
ArmAsm
118 lines
4.7 KiB
ArmAsm
/**************************************************************************
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* up_fullcontextrestore.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_fullcontextrestore
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**************************************************************************/
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.globl up_fullcontextrestore
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.type up_fullcontextrestore, function
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up_fullcontextrestore:
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/* On entry, a1 (r0) holds address of the register save area */
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/* Recover all registers except for r0, r1, R15, and CPSR */
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add r1, r0, #(4*REG_R2) /* Offset to REG_R2 storage */
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ldmia r1, {r2-r14} /* Recover registers */
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/* Create a stack frame to hold the PC */
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sub sp, sp, #(3*4) /* Frame for three registers */
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ldr r1, [r0, #(4*REG_R0)] /* Fetch the stored r0 value */
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str r1, [sp] /* Save it at the top of the stack */
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ldr r1, [r0, #(4*REG_R1)] /* Fetch the stored r1 value */
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str r1, [sp, #4] /* Save it in the stack */
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ldr r1, [r0, #(4*REG_PC)] /* Fetch the stored pc value */
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str r1, [sp, #8] /* Save it at the bottom of the frame */
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/* Now we can restore the CPSR. We wait until we are completely
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* finished with the context save data to do this. Restore the CPSR
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* may re-enable and interrupts and we couldt be in a context
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* where save structure is only protected by interrupts being disabled.
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*/
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ldr r1, [r0, #(4*REG_CPSR)] /* Fetch the stored CPSR value */
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msr cpsr, r1 /* Set the CPSR */
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/* Now recover r0 and r1 */
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ldr r0, [sp]
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ldr r1, [sp, #4]
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add sp, sp, #(2*4)
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/* Then return to the address at the stop of the stack,
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* destroying the stack frame
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*/
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ldr pc, [sp], #4
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.size up_fullcontextrestore, . - up_fullcontextrestore
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