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32 | #include <arch/cp0.h> |
32 | #include <arch/cp0.h> |
33 | #include <arch/types.h> |
33 | #include <arch/types.h> |
34 | #include <arch.h> |
34 | #include <arch.h> |
35 | #include <debug.h> |
35 | #include <debug.h> |
36 | 36 | ||
37 | void exception(void) |
37 | void exception(struct exception_regdump *pstate) |
38 | { |
38 | { |
39 | int excno; |
39 | int excno; |
40 | __u32 epc; |
- | |
41 | __u32 epc_shift = 0; |
40 | __u32 epc_shift = 0; |
42 | 41 | ||
43 | ASSERT(CPU != NULL); |
42 | ASSERT(CPU != NULL); |
44 | 43 | ||
45 | /* |
44 | /* |
46 | * NOTE ON OPERATION ORDERING |
45 | * NOTE ON OPERATION ORDERING |
47 | * |
46 | * |
48 | * On entry, cpu_priority_high() must be called before exception bit is cleared. |
47 | * On entry, cpu_priority_high() must be called before |
49 | * On exit, exception bit must be set before cpu_priority_restore() is called. |
48 | * exception bit is cleared. |
50 | */ |
49 | */ |
51 | 50 | ||
52 | cpu_priority_high(); |
51 | cpu_priority_high(); |
53 | epc = cp0_epc_read(); |
- | |
54 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
52 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
55 | cp0_status_um_bit)); |
53 | cp0_status_um_bit)); |
56 | 54 | ||
57 | if (THREAD) { |
- | |
58 | THREAD->saved_epc = epc; |
- | |
59 | } |
- | |
60 | /* decode exception number and process the exception */ |
55 | /* decode exception number and process the exception */ |
61 | switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
56 | switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
62 | case EXC_Int: |
57 | case EXC_Int: |
63 | interrupt(); |
58 | interrupt(); |
64 | break; |
59 | break; |
65 | case EXC_TLBL: |
60 | case EXC_TLBL: |
66 | case EXC_TLBS: |
61 | case EXC_TLBS: |
67 | tlb_invalid(); |
62 | tlb_invalid(pstate); |
68 | break; |
63 | break; |
69 | case EXC_Mod: |
64 | case EXC_Mod: |
70 | panic("unhandled TLB Modification Exception\n"); |
65 | panic("unhandled TLB Modification Exception\n"); |
71 | break; |
66 | break; |
72 | case EXC_AdEL: |
67 | case EXC_AdEL: |
Line 112... | Line 107... | ||
112 | break; |
107 | break; |
113 | default: |
108 | default: |
114 | panic("unhandled exception %d\n", excno); |
109 | panic("unhandled exception %d\n", excno); |
115 | } |
110 | } |
116 | 111 | ||
117 | if (THREAD) |
- | |
118 | epc = THREAD->saved_epc; |
- | |
119 | - | ||
120 | /* Raise EXL bit before epc_write, so that we support |
- | |
121 | * properly nested exceptions |
- | |
122 | */ |
- | |
123 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
- | |
124 | cp0_epc_write(epc + epc_shift); |
112 | pstate->epc += epc_shift; |
125 | } |
113 | } |