70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
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/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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* SPDX-License-Identifier: Apache-2.0
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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_rtos.h"
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#include "xtensa_api.h"
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#include <kernel_structs.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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FatalErrorHandler();
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CODE_UNREACHABLE;
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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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} 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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/*
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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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ReservedInterruptHandler((unsigned int)arg);
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CODE_UNREACHABLE;
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}
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#endif /* XCHAL_HAVE_INTERRUPTS */
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