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68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/****************************************************************************
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* arch/ceva/src/common/ceva_saveusercontext.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/irq.h>
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#include <arch/syscall.h>
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#include "ceva_internal.h"
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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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* Description:
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* Save the current thread context. Full prototype is:
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*
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* int up_saveusercontext(void *saveregs);
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*
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* Return:
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* 0: Normal return
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* 1: Context switch return
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*
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****************************************************************************/
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int up_saveusercontext(void *saveregs)
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{
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int ret;
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/* Let sys_call1() do all of the work */
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ret = sys_call1(SYS_save_context, (uintptr_t)saveregs);
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if (ret == 0)
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{
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/* There are two return conditions. On the first return, A0 (the
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* return value will be zero. On the second return we need to
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* force A0 to be 1.
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*/
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saveregs[REG_A0] = 1;
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}
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return ret;
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}
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