| /* |
| * 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 */ |