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1 | jermar | 1 | /* |
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 | |||
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 | |||
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 | |||
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 | |||
45 | if (the->thread) { |
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46 | the->thread->saved_pri = pri; |
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47 | the->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 | |||
57 | if (the->thread) { |
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58 | pri = the->thread->saved_pri; |
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59 | epc = the->thread->saved_epc; |
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60 | } |
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61 | |||
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 | } |