faults.cc revision 7676
1/* 2 * Copyright (c) 2003-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Gabe Black 29 * Kevin Lim 30 */ 31 32#include "arch/alpha/ev5.hh" 33#include "arch/alpha/faults.hh" 34#include "arch/alpha/tlb.hh" 35#include "cpu/thread_context.hh" 36#include "cpu/base.hh" 37#include "base/trace.hh" 38 39#if !FULL_SYSTEM 40#include "sim/process.hh" 41#include "mem/page_table.hh" 42#endif 43 44namespace AlphaISA { 45 46FaultName MachineCheckFault::_name = "mchk"; 47FaultVect MachineCheckFault::_vect = 0x0401; 48FaultStat MachineCheckFault::_count; 49 50FaultName AlignmentFault::_name = "unalign"; 51FaultVect AlignmentFault::_vect = 0x0301; 52FaultStat AlignmentFault::_count; 53 54FaultName ResetFault::_name = "reset"; 55FaultVect ResetFault::_vect = 0x0001; 56FaultStat ResetFault::_count; 57 58FaultName ArithmeticFault::_name = "arith"; 59FaultVect ArithmeticFault::_vect = 0x0501; 60FaultStat ArithmeticFault::_count; 61 62FaultName InterruptFault::_name = "interrupt"; 63FaultVect InterruptFault::_vect = 0x0101; 64FaultStat InterruptFault::_count; 65 66FaultName NDtbMissFault::_name = "dtb_miss_single"; 67FaultVect NDtbMissFault::_vect = 0x0201; 68FaultStat NDtbMissFault::_count; 69 70FaultName PDtbMissFault::_name = "dtb_miss_double"; 71FaultVect PDtbMissFault::_vect = 0x0281; 72FaultStat PDtbMissFault::_count; 73 74FaultName DtbPageFault::_name = "dfault"; 75FaultVect DtbPageFault::_vect = 0x0381; 76FaultStat DtbPageFault::_count; 77 78FaultName DtbAcvFault::_name = "dfault"; 79FaultVect DtbAcvFault::_vect = 0x0381; 80FaultStat DtbAcvFault::_count; 81 82FaultName DtbAlignmentFault::_name = "unalign"; 83FaultVect DtbAlignmentFault::_vect = 0x0301; 84FaultStat DtbAlignmentFault::_count; 85 86FaultName ItbPageFault::_name = "itbmiss"; 87FaultVect ItbPageFault::_vect = 0x0181; 88FaultStat ItbPageFault::_count; 89 90FaultName ItbAcvFault::_name = "iaccvio"; 91FaultVect ItbAcvFault::_vect = 0x0081; 92FaultStat ItbAcvFault::_count; 93 94FaultName UnimplementedOpcodeFault::_name = "opdec"; 95FaultVect UnimplementedOpcodeFault::_vect = 0x0481; 96FaultStat UnimplementedOpcodeFault::_count; 97 98FaultName FloatEnableFault::_name = "fen"; 99FaultVect FloatEnableFault::_vect = 0x0581; 100FaultStat FloatEnableFault::_count; 101 102FaultName PalFault::_name = "pal"; 103FaultVect PalFault::_vect = 0x2001; 104FaultStat PalFault::_count; 105 106FaultName IntegerOverflowFault::_name = "intover"; 107FaultVect IntegerOverflowFault::_vect = 0x0501; 108FaultStat IntegerOverflowFault::_count; 109 110#if FULL_SYSTEM 111 112void 113AlphaFault::invoke(ThreadContext *tc) 114{ 115 FaultBase::invoke(tc); 116 countStat()++; 117 118 // exception restart address 119 if (setRestartAddress() || !(tc->readPC() & 0x3)) 120 tc->setMiscRegNoEffect(IPR_EXC_ADDR, tc->readPC()); 121 122 if (skipFaultingInstruction()) { 123 // traps... skip faulting instruction. 124 tc->setMiscRegNoEffect(IPR_EXC_ADDR, 125 tc->readMiscRegNoEffect(IPR_EXC_ADDR) + 4); 126 } 127 128 tc->setPC(tc->readMiscRegNoEffect(IPR_PAL_BASE) + vect()); 129 tc->setNextPC(tc->readPC() + sizeof(MachInst)); 130} 131 132void 133ArithmeticFault::invoke(ThreadContext *tc) 134{ 135 FaultBase::invoke(tc); 136 panic("Arithmetic traps are unimplemented!"); 137} 138 139void 140DtbFault::invoke(ThreadContext *tc) 141{ 142 // Set fault address and flags. Even though we're modeling an 143 // EV5, we use the EV6 technique of not latching fault registers 144 // on VPTE loads (instead of locking the registers until IPR_VA is 145 // read, like the EV5). The EV6 approach is cleaner and seems to 146 // work with EV5 PAL code, but not the other way around. 147 if (!tc->misspeculating() && 148 reqFlags.noneSet(Request::VPTE | Request::PREFETCH)) { 149 // set VA register with faulting address 150 tc->setMiscRegNoEffect(IPR_VA, vaddr); 151 152 // set MM_STAT register flags 153 tc->setMiscRegNoEffect(IPR_MM_STAT, 154 (((Opcode(tc->getInst()) & 0x3f) << 11) | 155 ((Ra(tc->getInst()) & 0x1f) << 6) | 156 (flags & 0x3f))); 157 158 // set VA_FORM register with faulting formatted address 159 tc->setMiscRegNoEffect(IPR_VA_FORM, 160 tc->readMiscRegNoEffect(IPR_MVPTBR) | (vaddr.vpn() << 3)); 161 } 162 163 AlphaFault::invoke(tc); 164} 165 166void 167ItbFault::invoke(ThreadContext *tc) 168{ 169 if (!tc->misspeculating()) { 170 tc->setMiscRegNoEffect(IPR_ITB_TAG, pc); 171 tc->setMiscRegNoEffect(IPR_IFAULT_VA_FORM, 172 tc->readMiscRegNoEffect(IPR_IVPTBR) | (VAddr(pc).vpn() << 3)); 173 } 174 175 AlphaFault::invoke(tc); 176} 177 178#else 179 180void 181ItbPageFault::invoke(ThreadContext *tc) 182{ 183 Process *p = tc->getProcessPtr(); 184 TlbEntry entry; 185 bool success = p->pTable->lookup(pc, entry); 186 if (!success) { 187 panic("Tried to execute unmapped address %#x.\n", pc); 188 } else { 189 VAddr vaddr(pc); 190 tc->getITBPtr()->insert(vaddr.page(), entry); 191 } 192} 193 194void 195NDtbMissFault::invoke(ThreadContext *tc) 196{ 197 Process *p = tc->getProcessPtr(); 198 TlbEntry entry; 199 bool success = p->pTable->lookup(vaddr, entry); 200 if (!success) { 201 p->checkAndAllocNextPage(vaddr); 202 success = p->pTable->lookup(vaddr, entry); 203 } 204 if (!success) { 205 panic("Tried to access unmapped address %#x.\n", (Addr)vaddr); 206 } else { 207 tc->getDTBPtr()->insert(vaddr.page(), entry); 208 } 209} 210 211#endif 212 213} // namespace AlphaISA 214 215