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Diffstat (limited to 'src/arch/alpha/faults.cc')
| -rw-r--r-- | src/arch/alpha/faults.cc | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/arch/alpha/faults.cc b/src/arch/alpha/faults.cc new file mode 100644 index 000000000..8493223ff --- /dev/null +++ b/src/arch/alpha/faults.cc @@ -0,0 +1,179 @@ +/* + * 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/faults.hh" +#include "cpu/thread_context.hh" +#include "cpu/base.hh" +#include "base/trace.hh" +#if FULL_SYSTEM +#include "arch/alpha/ev5.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 ItbMissFault::_name = "itbmiss"; +FaultVect ItbMissFault::_vect = 0x0181; +FaultStat ItbMissFault::_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->inPalMode()) + tc->setMiscReg(AlphaISA::IPR_EXC_ADDR, tc->readPC()); + + if (skipFaultingInstruction()) { + // traps... skip faulting instruction. + tc->setMiscReg(AlphaISA::IPR_EXC_ADDR, + tc->readMiscReg(AlphaISA::IPR_EXC_ADDR) + 4); + } + + tc->setPC(tc->readMiscReg(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->setMiscReg(AlphaISA::IPR_VA, vaddr); + + // set MM_STAT register flags + tc->setMiscReg(AlphaISA::IPR_MM_STAT, + (((EV5::Opcode(tc->getInst()) & 0x3f) << 11) + | ((EV5::Ra(tc->getInst()) & 0x1f) << 6) + | (flags & 0x3f))); + + // set VA_FORM register with faulting formatted address + tc->setMiscReg(AlphaISA::IPR_VA_FORM, + tc->readMiscReg(AlphaISA::IPR_MVPTBR) | (vaddr.vpn() << 3)); + } + + AlphaFault::invoke(tc); +} + +void ItbFault::invoke(ThreadContext * tc) +{ + if (!tc->misspeculating()) { + tc->setMiscReg(AlphaISA::IPR_ITB_TAG, pc); + tc->setMiscReg(AlphaISA::IPR_IFAULT_VA_FORM, + tc->readMiscReg(AlphaISA::IPR_IVPTBR) | + (AlphaISA::VAddr(pc).vpn() << 3)); + } + + AlphaFault::invoke(tc); +} + +#endif + +} // namespace AlphaISA + |