92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_copyarmstate.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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/config.h>
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#include <stdint.h>
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#include <arch/irq.h>
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#include "up_internal.h"
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#ifdef CONFIG_ARCH_FPU
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_copyarmstate
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*
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* Description:
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* Copy the ARM portion of the register save area (omitting the floating
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* point registers) and save the floating pointer register directly.
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*
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****************************************************************************/
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void up_copyarmstate(uint32_t *dest, uint32_t *src)
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{
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int i;
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/* In the Cortex-A model, the state is copied from the stack to the TCB,
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* but only a reference is passed to get the state from the TCB. So the
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* following check avoids copying the TCB save area onto itself:
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*/
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if (src != dest)
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{
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/* Save the floating point registers: This will initialize the floating
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* registers at indices ARM_CONTEXT_REGS through (XCPTCONTEXT_REGS-1)
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*/
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up_savefpu(dest);
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/* Then copy all of the ARM registers (omitting the floating point
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* registers). Indices: 0 through (ARM_CONTEXT_REGS-1).
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*/
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for (i = 0; i < ARM_CONTEXT_REGS; i++)
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{
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*dest++ = *src++;
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}
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}
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}
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#endif /* CONFIG_ARCH_FPU */
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