62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* fiber_abort.c - ARM Cortex-M fiber_abort() routine */
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/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* DESCRIPTION
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* The ARM Cortex-M architecture provides its own fiber_abort() to deal with
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* different CPU modes (handler vs thread) when a fiber aborts. When its entry
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* point returns or when it aborts itself, the CPU is in thread mode and must
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* call _Swap() (which triggers a service call), but when in handler mode, the
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* CPU must exit handler mode to cause the context switch, and thus must queue
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* the PendSV exception.
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*/
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#ifdef CONFIG_MICROKERNEL
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#include <microkernel.h>
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#include <micro_private_types.h>
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#endif
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#include <nano_private.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <nanokernel.h>
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#include <arch/cpu.h>
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/**
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*
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* @brief Abort the currently executing fiber
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*
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* Possible reasons for a fiber aborting:
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*
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* - the fiber explicitly aborts itself by calling this routine
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* - the fiber implicitly aborts by returning from its entry point
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* - the fiber encounters a fatal exception
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*
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* @return N/A
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*/
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void fiber_abort(void)
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{
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_thread_exit(_nanokernel.current);
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if (_ScbIsInThreadMode()) {
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_nano_fiber_swap();
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} else {
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_ScbPendsvSet();
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}
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}
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