1 /* exc-sethandler.c - register an exception handler in XTOS */
4 * Copyright (c) 1999-2006 Tensilica Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
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10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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26 #include <xtensa/config/core.h>
27 #include <xtensa/config/specreg.h>
28 #include "xtos-internal.h"
31 #if XCHAL_HAVE_EXCEPTIONS
33 extern void _xtos_c_wrapper_handler(void); /* assembly-level handler for C handlers */
34 extern void _xtos_unhandled_exception(void); /* assembly-level handler for exceptions
35 with no registered handler */
36 extern void _xtos_p_none(void); /* default/empty C handler */
39 extern _xtos_handler _xtos_c_handler_table[];
40 extern _xtos_handler _xtos_exc_handler_table[];
43 * Register a C handler for the specified general exception
44 * (specified EXCCAUSE value).
46 _xtos_handler _xtos_set_exception_handler( int n, _xtos_handler f )
50 if( (unsigned) n >= XCHAL_EXCCAUSE_NUM )
54 ret = _xtos_c_handler_table[n];
55 _xtos_exc_handler_table[n] = ( (f == &_xtos_p_none)
56 ? &_xtos_unhandled_exception
57 : &_xtos_c_wrapper_handler );
58 _xtos_c_handler_table[n] = f;
59 if( ret == &_xtos_p_none )
65 #endif /* XCHAL_HAVE_EXCEPTIONS */