| 0,0 → 1,65 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <arch/exception.h> |
| #include <panic.h> |
| #include <arch/cp0.h> |
| #include <arch/types.h> |
| #include <arch.h> |
| |
| void exception(void) |
| { |
| int excno; |
| __u32 epc; |
| pri_t pri; |
| |
| pri = cpu_priority_high(); |
| epc = cp0_epc_read(); |
| cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
| |
| if (the->thread) { |
| the->thread->saved_pri = pri; |
| the->thread->saved_epc = epc; |
| } |
| /* decode exception number and process the exception */ |
| switch(excno = (cp0_cause_read()>>2)&0x1f) { |
| case EXC_Int: interrupt(); break; |
| case EXC_TLBL: |
| case EXC_TLBS: tlb_invalid(); break; |
| default: panic(PANIC "unhandled exception %d\n", excno); break; |
| } |
| |
| if (the->thread) { |
| pri = the->thread->saved_pri; |
| epc = the->thread->saved_epc; |
| } |
| |
| cp0_epc_write(epc); |
| cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
| cpu_priority_restore(pri); |
| } |