| 34,10 → 34,9 |
|---|
| #include <arch.h> |
| #include <debug.h> |
| |
| void exception(void) |
| void exception(struct exception_regdump *pstate) |
| { |
| int excno; |
| __u32 epc; |
| __u32 epc_shift = 0; |
| |
| ASSERT(CPU != NULL); |
| 45,18 → 44,14 |
|---|
| /* |
| * NOTE ON OPERATION ORDERING |
| * |
| * On entry, cpu_priority_high() must be called before exception bit is cleared. |
| * On exit, exception bit must be set before cpu_priority_restore() is called. |
| * On entry, cpu_priority_high() must be called before |
| * exception bit is cleared. |
| */ |
| |
| cpu_priority_high(); |
| epc = cp0_epc_read(); |
| cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
| cp0_status_um_bit)); |
| |
| if (THREAD) { |
| THREAD->saved_epc = epc; |
| } |
| /* decode exception number and process the exception */ |
| switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
| case EXC_Int: |
| 64,7 → 59,7 |
|---|
| break; |
| case EXC_TLBL: |
| case EXC_TLBS: |
| tlb_invalid(); |
| tlb_invalid(pstate); |
| break; |
| case EXC_Mod: |
| panic("unhandled TLB Modification Exception\n"); |
| 114,12 → 109,5 |
|---|
| panic("unhandled exception %d\n", excno); |
| } |
| |
| if (THREAD) |
| epc = THREAD->saved_epc; |
| |
| /* Raise EXL bit before epc_write, so that we support |
| * properly nested exceptions |
| */ |
| cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
| cp0_epc_write(epc + epc_shift); |
| pstate->epc += epc_shift; |
| } |