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34 | 34 | ||
35 | void exception(void) |
35 | void exception(void) |
36 | { |
36 | { |
37 | int excno; |
37 | int excno; |
38 | __u32 epc; |
38 | __u32 epc; |
- | 39 | __u32 epc_shift = 0; |
|
39 | pri_t pri; |
40 | pri_t pri; |
40 | 41 | ||
41 | pri = cpu_priority_high(); |
42 | pri = cpu_priority_high(); |
42 | epc = cp0_epc_read(); |
43 | epc = cp0_epc_read(); |
43 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
44 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
Line 45... | Line 46... | ||
45 | if (THREAD) { |
46 | if (THREAD) { |
46 | THREAD->saved_pri = pri; |
47 | THREAD->saved_pri = pri; |
47 | THREAD->saved_epc = epc; |
48 | THREAD->saved_epc = epc; |
48 | } |
49 | } |
49 | /* decode exception number and process the exception */ |
50 | /* decode exception number and process the exception */ |
50 | switch(excno = (cp0_cause_read()>>2)&0x1f) { |
51 | switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
51 | case EXC_Int: interrupt(); break; |
52 | case EXC_Int: |
- | 53 | interrupt(); |
|
- | 54 | break; |
|
52 | case EXC_TLBL: |
55 | case EXC_TLBL: |
- | 56 | case EXC_TLBS: |
|
53 | case EXC_TLBS: tlb_invalid(); break; |
57 | tlb_invalid(); |
- | 58 | break; |
|
- | 59 | case EXC_Mod: |
|
- | 60 | panic("unhandled TLB Modification Exception\n"); |
|
- | 61 | break; |
|
- | 62 | case EXC_AdEL: |
|
- | 63 | panic("unhandled Address Error Exception - load or instruction fetch\n"); |
|
- | 64 | break; |
|
- | 65 | case EXC_AdES: |
|
- | 66 | panic("unhandled Address Error Exception - store\n"); |
|
- | 67 | break; |
|
- | 68 | case EXC_IBE: |
|
- | 69 | panic("unhandled Bus Error Exception - fetch instruction\n"); |
|
- | 70 | break; |
|
- | 71 | case EXC_DBE: |
|
- | 72 | panic("unhandled Bus Error Exception - data reference: load or store\n"); |
|
- | 73 | break; |
|
- | 74 | case EXC_Bp: |
|
- | 75 | /* it is necessary to not re-execute BREAK instruction after returning from Exception handler |
|
- | 76 | (see page 138 in R4000 Manual for more information) */ |
|
- | 77 | epc_shift = 4; |
|
- | 78 | break; |
|
- | 79 | case EXC_RI: |
|
- | 80 | panic("unhandled Reserved Instruction Exception\n"); |
|
- | 81 | break; |
|
- | 82 | case EXC_CpU: |
|
- | 83 | panic("unhandled Coprocessor Unusable Exception\n"); |
|
- | 84 | break; |
|
- | 85 | case EXC_Ov: |
|
- | 86 | panic("unhandled Arithmetic Overflow Exception\n"); |
|
- | 87 | break; |
|
- | 88 | case EXC_Tr: |
|
- | 89 | panic("unhandled Trap Exception\n"); |
|
- | 90 | break; |
|
- | 91 | case EXC_VCEI: |
|
- | 92 | panic("unhandled Virtual Coherency Exception - instruction\n"); |
|
- | 93 | break; |
|
- | 94 | case EXC_FPE: |
|
- | 95 | panic("unhandled Floating-Point Exception\n"); |
|
- | 96 | break; |
|
- | 97 | case EXC_WATCH: |
|
- | 98 | panic("unhandled reference to WatchHi/WatchLo address\n"); |
|
- | 99 | break; |
|
- | 100 | case EXC_VCED: |
|
- | 101 | panic("unhandled Virtual Coherency Exception - data\n"); |
|
- | 102 | break; |
|
- | 103 | default: |
|
54 | default: panic("unhandled exception %d\n", excno); break; |
104 | panic("unhandled exception %d\n", excno); |
55 | } |
105 | } |
56 | 106 | ||
57 | if (THREAD) { |
107 | if (THREAD) { |
58 | pri = THREAD->saved_pri; |
108 | pri = THREAD->saved_pri; |
59 | epc = THREAD->saved_epc; |
109 | epc = THREAD->saved_epc; |
60 | } |
110 | } |
61 | 111 | ||
62 | cp0_epc_write(epc); |
112 | cp0_epc_write(epc + epc_shift); |
63 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
113 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
64 | cpu_priority_restore(pri); |
114 | cpu_priority_restore(pri); |
65 | } |
115 | } |