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/*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* 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;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*
* Authors: Gabe Black
* Kevin Lim
*/
#include "arch/alpha/ev5.hh"
#include "arch/alpha/faults.hh"
#include "arch/alpha/tlb.hh"
#include "cpu/thread_context.hh"
#include "cpu/base.hh"
#include "base/trace.hh"
#if !FULL_SYSTEM
#include "sim/process.hh"
#include "mem/page_table.hh"
#endif
namespace AlphaISA
{
FaultName MachineCheckFault::_name = "mchk";
FaultVect MachineCheckFault::_vect = 0x0401;
FaultStat MachineCheckFault::_count;
FaultName AlignmentFault::_name = "unalign";
FaultVect AlignmentFault::_vect = 0x0301;
FaultStat AlignmentFault::_count;
FaultName ResetFault::_name = "reset";
FaultVect ResetFault::_vect = 0x0001;
FaultStat ResetFault::_count;
FaultName ArithmeticFault::_name = "arith";
FaultVect ArithmeticFault::_vect = 0x0501;
FaultStat ArithmeticFault::_count;
FaultName InterruptFault::_name = "interrupt";
FaultVect InterruptFault::_vect = 0x0101;
FaultStat InterruptFault::_count;
FaultName NDtbMissFault::_name = "dtb_miss_single";
FaultVect NDtbMissFault::_vect = 0x0201;
FaultStat NDtbMissFault::_count;
FaultName PDtbMissFault::_name = "dtb_miss_double";
FaultVect PDtbMissFault::_vect = 0x0281;
FaultStat PDtbMissFault::_count;
FaultName DtbPageFault::_name = "dfault";
FaultVect DtbPageFault::_vect = 0x0381;
FaultStat DtbPageFault::_count;
FaultName DtbAcvFault::_name = "dfault";
FaultVect DtbAcvFault::_vect = 0x0381;
FaultStat DtbAcvFault::_count;
FaultName DtbAlignmentFault::_name = "unalign";
FaultVect DtbAlignmentFault::_vect = 0x0301;
FaultStat DtbAlignmentFault::_count;
FaultName ItbPageFault::_name = "itbmiss";
FaultVect ItbPageFault::_vect = 0x0181;
FaultStat ItbPageFault::_count;
FaultName ItbAcvFault::_name = "iaccvio";
FaultVect ItbAcvFault::_vect = 0x0081;
FaultStat ItbAcvFault::_count;
FaultName UnimplementedOpcodeFault::_name = "opdec";
FaultVect UnimplementedOpcodeFault::_vect = 0x0481;
FaultStat UnimplementedOpcodeFault::_count;
FaultName FloatEnableFault::_name = "fen";
FaultVect FloatEnableFault::_vect = 0x0581;
FaultStat FloatEnableFault::_count;
FaultName PalFault::_name = "pal";
FaultVect PalFault::_vect = 0x2001;
FaultStat PalFault::_count;
FaultName IntegerOverflowFault::_name = "intover";
FaultVect IntegerOverflowFault::_vect = 0x0501;
FaultStat IntegerOverflowFault::_count;
#if FULL_SYSTEM
void AlphaFault::invoke(ThreadContext * tc)
{
FaultBase::invoke(tc);
countStat()++;
// exception restart address
if (setRestartAddress() || !(tc->readPC() & 0x3))
tc->setMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR, tc->readPC());
if (skipFaultingInstruction()) {
// traps... skip faulting instruction.
tc->setMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR,
tc->readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR) + 4);
}
tc->setPC(tc->readMiscRegNoEffect(AlphaISA::IPR_PAL_BASE) + vect());
tc->setNextPC(tc->readPC() + sizeof(MachInst));
}
void ArithmeticFault::invoke(ThreadContext * tc)
{
FaultBase::invoke(tc);
panic("Arithmetic traps are unimplemented!");
}
void DtbFault::invoke(ThreadContext * tc)
{
// Set fault address and flags. Even though we're modeling an
// EV5, we use the EV6 technique of not latching fault registers
// on VPTE loads (instead of locking the registers until IPR_VA is
// read, like the EV5). The EV6 approach is cleaner and seems to
// work with EV5 PAL code, but not the other way around.
if (!tc->misspeculating()
&& !(reqFlags & VPTE) && !(reqFlags & NO_FAULT)) {
// set VA register with faulting address
tc->setMiscRegNoEffect(AlphaISA::IPR_VA, vaddr);
// set MM_STAT register flags
tc->setMiscRegNoEffect(AlphaISA::IPR_MM_STAT,
(((AlphaISA::Opcode(tc->getInst()) & 0x3f) << 11)
| ((AlphaISA::Ra(tc->getInst()) & 0x1f) << 6)
| (flags & 0x3f)));
// set VA_FORM register with faulting formatted address
tc->setMiscRegNoEffect(AlphaISA::IPR_VA_FORM,
tc->readMiscRegNoEffect(AlphaISA::IPR_MVPTBR) | (vaddr.vpn() << 3));
}
AlphaFault::invoke(tc);
}
void ItbFault::invoke(ThreadContext * tc)
{
if (!tc->misspeculating()) {
tc->setMiscRegNoEffect(AlphaISA::IPR_ITB_TAG, pc);
tc->setMiscRegNoEffect(AlphaISA::IPR_IFAULT_VA_FORM,
tc->readMiscRegNoEffect(AlphaISA::IPR_IVPTBR) |
(AlphaISA::VAddr(pc).vpn() << 3));
}
AlphaFault::invoke(tc);
}
#else
void ItbPageFault::invoke(ThreadContext * tc)
{
Process *p = tc->getProcessPtr();
TlbEntry entry;
bool success = p->pTable->lookup(pc, entry);
if(!success) {
panic("Tried to execute unmapped address %#x.\n", pc);
} else {
VAddr vaddr(pc);
tc->getITBPtr()->insert(vaddr.page(), entry);
}
}
void NDtbMissFault::invoke(ThreadContext * tc)
{
Process *p = tc->getProcessPtr();
TlbEntry entry;
bool success = p->pTable->lookup(vaddr, entry);
if(!success) {
p->checkAndAllocNextPage(vaddr);
success = p->pTable->lookup(vaddr, entry);
}
if(!success) {
panic("Tried to access unmapped address %#x.\n", (Addr)vaddr);
} else {
tc->getDTBPtr()->insert(vaddr.page(), entry);
}
}
#endif
} // namespace AlphaISA
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