/* | |
* Copyright (c) 2015-2019 Cadence Design Systems, Inc. | |
* | |
* 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. | |
*/ | |
/* | |
* 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_EXCEPTIONS */ | |
#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 */ |