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