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); |
} |