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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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123 | decky | 39 | __u32 epc_shift = 0; |
1 | jermar | 40 | pri_t pri; |
41 | |||
42 | pri = cpu_priority_high(); |
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43 | epc = cp0_epc_read(); |
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44 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
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45 | |||
15 | jermar | 46 | if (THREAD) { |
47 | THREAD->saved_pri = pri; |
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48 | THREAD->saved_epc = epc; |
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1 | jermar | 49 | } |
50 | /* decode exception number and process the exception */ |
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123 | decky | 51 | switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
52 | case EXC_Int: |
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53 | interrupt(); |
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54 | break; |
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1 | jermar | 55 | case EXC_TLBL: |
123 | decky | 56 | case EXC_TLBS: |
57 | tlb_invalid(); |
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58 | break; |
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59 | case EXC_Mod: |
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60 | panic("unhandled TLB Modification Exception\n"); |
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61 | break; |
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62 | case EXC_AdEL: |
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63 | panic("unhandled Address Error Exception - load or instruction fetch\n"); |
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64 | break; |
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65 | case EXC_AdES: |
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66 | panic("unhandled Address Error Exception - store\n"); |
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67 | break; |
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68 | case EXC_IBE: |
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69 | panic("unhandled Bus Error Exception - fetch instruction\n"); |
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70 | break; |
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71 | case EXC_DBE: |
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72 | panic("unhandled Bus Error Exception - data reference: load or store\n"); |
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73 | break; |
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74 | case EXC_Bp: |
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75 | /* it is necessary to not re-execute BREAK instruction after returning from Exception handler |
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76 | (see page 138 in R4000 Manual for more information) */ |
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77 | epc_shift = 4; |
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78 | break; |
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79 | case EXC_RI: |
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80 | panic("unhandled Reserved Instruction Exception\n"); |
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81 | break; |
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82 | case EXC_CpU: |
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83 | panic("unhandled Coprocessor Unusable Exception\n"); |
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84 | break; |
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85 | case EXC_Ov: |
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86 | panic("unhandled Arithmetic Overflow Exception\n"); |
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87 | break; |
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88 | case EXC_Tr: |
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89 | panic("unhandled Trap Exception\n"); |
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90 | break; |
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91 | case EXC_VCEI: |
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92 | panic("unhandled Virtual Coherency Exception - instruction\n"); |
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93 | break; |
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94 | case EXC_FPE: |
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95 | panic("unhandled Floating-Point Exception\n"); |
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96 | break; |
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97 | case EXC_WATCH: |
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98 | panic("unhandled reference to WatchHi/WatchLo address\n"); |
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99 | break; |
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100 | case EXC_VCED: |
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101 | panic("unhandled Virtual Coherency Exception - data\n"); |
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102 | break; |
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103 | default: |
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104 | panic("unhandled exception %d\n", excno); |
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1 | jermar | 105 | } |
106 | |||
15 | jermar | 107 | if (THREAD) { |
108 | pri = THREAD->saved_pri; |
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109 | epc = THREAD->saved_epc; |
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1 | jermar | 110 | } |
111 | |||
123 | decky | 112 | cp0_epc_write(epc + epc_shift); |
1 | jermar | 113 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
114 | cpu_priority_restore(pri); |
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115 | } |