| 1 | /*
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| 2 | * Copyright (C) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include <arch/exception.h>
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| 30 | #include <panic.h>
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| 31 | #include <arch/cp0.h>
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| 32 | #include <arch/types.h>
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| 33 | #include <arch.h>
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| 34 |
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| 35 | void exception(void)
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| 36 | {
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| 37 | int excno;
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| 38 | __u32 epc;
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| 39 | pri_t pri;
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| 40 |
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| 41 | pri = cpu_priority_high();
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| 42 | epc = cp0_epc_read();
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| 43 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit);
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| 44 |
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| 45 | if (THREAD) {
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| 46 | THREAD->saved_pri = pri;
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| 47 | THREAD->saved_epc = epc;
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| 48 | }
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| 49 | /* decode exception number and process the exception */
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| 50 | switch(excno = (cp0_cause_read()>>2)&0x1f) {
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| 51 | case EXC_Int: interrupt(); break;
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| 52 | case EXC_TLBL:
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| 53 | case EXC_TLBS: tlb_invalid(); break;
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| 54 | default: panic(PANIC "unhandled exception %d\n", excno); break;
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| 55 | }
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| 56 |
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| 57 | if (THREAD) {
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| 58 | pri = THREAD->saved_pri;
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| 59 | epc = THREAD->saved_epc;
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| 60 | }
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| 61 |
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| 62 | cp0_epc_write(epc);
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| 63 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit);
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| 64 | cpu_priority_restore(pri);
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| 65 | }
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