| /* exc-sethandler.c - register an exception handler in XTOS */ |
| |
| /* |
| * Copyright (c) 1999-2006 Tensilica 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. |
| */ |
| |
| #include <xtensa/config/core.h> |
| #include <xtensa/config/specreg.h> |
| #include "xtos-internal.h" |
| |
| |
| #if XCHAL_HAVE_EXCEPTIONS |
| |
| extern void _xtos_c_wrapper_handler(void); /* assembly-level handler for C handlers */ |
| extern void _xtos_unhandled_exception(void); /* assembly-level handler for exceptions |
| with no registered handler */ |
| extern void _xtos_p_none(void); /* default/empty C handler */ |
| |
| |
| extern _xtos_handler _xtos_c_handler_table[]; |
| extern _xtos_handler _xtos_exc_handler_table[]; |
| |
| /* |
| * Register a C handler for the specified general exception |
| * (specified EXCCAUSE value). |
| */ |
| _xtos_handler _xtos_set_exception_handler( int n, _xtos_handler f ) |
| { |
| _xtos_handler ret; |
| |
| if( (unsigned) n >= XCHAL_EXCCAUSE_NUM ) |
| return 0; |
| if( f == 0 ) |
| f = &_xtos_p_none; |
| ret = _xtos_c_handler_table[n]; |
| _xtos_exc_handler_table[n] = ( (f == &_xtos_p_none) |
| ? &_xtos_unhandled_exception |
| : &_xtos_c_wrapper_handler ); |
| _xtos_c_handler_table[n] = f; |
| if( ret == &_xtos_p_none ) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| #endif /* XCHAL_HAVE_EXCEPTIONS */ |
| |