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139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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* FreeRTOS Kernel <DEVELOPMENT BRANCH>
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* Copyright (C) 2015-2019 Cadence Design Systems, Inc.
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* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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/*
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* Xtensa-specific interrupt and exception functions for RTOS ports.
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* Also see xtensa_intr_asm.S.
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*/
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#include <stdlib.h>
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#include <xtensa/config/core.h>
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#include "xtensa_api.h"
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#if XCHAL_HAVE_EXCEPTIONS
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/* Handler table is in xtensa_intr_asm.S */
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extern xt_exc_handler _xt_exception_table[XCHAL_EXCCAUSE_NUM];
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/*
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Default handler for unhandled exceptions.
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*/
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void xt_unhandled_exception(XtExcFrame *frame)
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{
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exit(-1);
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}
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/*
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This function registers a handler for the specified exception.
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The function returns the address of the previous handler.
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On error, it returns 0.
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*/
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xt_exc_handler xt_set_exception_handler(int n, xt_exc_handler f)
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{
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xt_exc_handler old;
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if( n < 0 || n >= XCHAL_EXCCAUSE_NUM )
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return 0; /* invalid exception number */
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old = _xt_exception_table[n];
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if (f) {
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_xt_exception_table[n] = f;
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}
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else {
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_xt_exception_table[n] = &xt_unhandled_exception;
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}
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return ((old == &xt_unhandled_exception) ? 0 : old);
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}
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#endif
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#if XCHAL_HAVE_INTERRUPTS
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/* Handler table is in xtensa_intr_asm.S */
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typedef struct xt_handler_table_entry {
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void * handler;
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void * arg;
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} xt_handler_table_entry;
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extern xt_handler_table_entry _xt_interrupt_table[XCHAL_NUM_INTERRUPTS];
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/*
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Default handler for unhandled interrupts.
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*/
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void xt_unhandled_interrupt(void * arg)
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{
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exit(-1);
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}
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/*
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This function registers a handler for the specified interrupt. The "arg"
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parameter specifies the argument to be passed to the handler when it is
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invoked. The function returns the address of the previous handler.
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On error, it returns 0.
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*/
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xt_handler xt_set_interrupt_handler(int n, xt_handler f, void * arg)
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{
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xt_handler_table_entry * entry;
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xt_handler old;
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if( n < 0 || n >= XCHAL_NUM_INTERRUPTS )
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return 0; /* invalid interrupt number */
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if( Xthal_intlevel[n] > XCHAL_EXCM_LEVEL )
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return 0; /* priority level too high to safely handle in C */
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entry = _xt_interrupt_table + n;
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old = entry->handler;
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if (f) {
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entry->handler = f;
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entry->arg = arg;
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}
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else {
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entry->handler = &xt_unhandled_interrupt;
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entry->arg = (void*)n;
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}
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return ((old == &xt_unhandled_interrupt) ? 0 : old);
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}
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#endif /* XCHAL_HAVE_INTERRUPTS */
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