src/arch/x86/faults.cc

   1 /*
   2  * Copyright (c) 2003-2007 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  */
  30
  31 /*
  32  * Copyright (c) 2007 The Hewlett-Packard Development Company
  33  * All rights reserved.
  34  *
  35  * Redistribution and use of this software in source and binary forms,
  36  * with or without modification, are permitted provided that the
  37  * following conditions are met:
  38  *
  39  * The software must be used only for Non-Commercial Use which means any
  40  * use which is NOT directed to receiving any direct monetary
  41  * compensation for, or commercial advantage from such use.  Illustrative
  42  * examples of non-commercial use are academic research, personal study,
  43  * teaching, education and corporate research & development.
  44  * Illustrative examples of commercial use are distributing products for
  45  * commercial advantage and providing services using the software for
  46  * commercial advantage.
  47  *
  48  * If you wish to use this software or functionality therein that may be
  49  * covered by patents for commercial use, please contact:
  50  *     Director of Intellectual Property Licensing
  51  *     Office of Strategy and Technology
  52  *     Hewlett-Packard Company
  53  *     1501 Page Mill Road
  54  *     Palo Alto, California  94304
  55  *
  56  * Redistributions of source code must retain the above copyright notice,
  57  * this list of conditions and the following disclaimer.  Redistributions
  58  * in binary form must reproduce the above copyright notice, this list of
  59  * conditions and the following disclaimer in the documentation and/or
  60  * other materials provided with the distribution.  Neither the name of
  61  * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
  62  * contributors may be used to endorse or promote products derived from
  63  * this software without specific prior written permission.  No right of
  64  * sublicense is granted herewith.  Derivatives of the software and
  65  * output created using the software may be prepared, but only for
  66  * Non-Commercial Uses.  Derivatives of the software may be shared with
  67  * others provided: (i) the others agree to abide by the list of
  68  * conditions herein which includes the Non-Commercial Use restrictions;
  69  * and (ii) such Derivatives of the software include the above copyright
  70  * notice to acknowledge the contribution from this software where
  71  * applicable, this list of conditions and the disclaimer below.
  72  *
  73  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  74  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  75  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  76  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  77  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  78  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  79  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  80  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  81  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  82  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  83  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  84  *
  85  * Authors: Gabe Black
  86  */
  87
  88 #include "arch/x86/decoder.hh"
  89 #include "arch/x86/faults.hh"
  90 #include "base/trace.hh"
  91 #include "config/full_system.hh"
  92 #include "cpu/thread_context.hh"
  93 #if !FULL_SYSTEM
  94 #include "arch/x86/isa_traits.hh"
  95 #include "mem/page_table.hh"
  96 #include "sim/process.hh"
  97 #else
  98 #include "arch/x86/tlb.hh"
  99 #endif
 100
 101 namespace X86ISA
 102 {
 103 #if FULL_SYSTEM
 104     void X86Trap::invoke(ThreadContext * tc)
 105     {
 106         panic("X86 faults are not implemented!");
 107     }
 108
 109     void X86Abort::invoke(ThreadContext * tc)
 110     {
 111         panic("X86 faults are not implemented!");
 112     }
 113
 114     void X86Interrupt::invoke(ThreadContext * tc)
 115     {
 116         using namespace X86ISAInst::RomLabels;
 117         HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
 118         MicroPC entry;
 119         if (m5reg.mode == LongMode) {
 120             entry = extern_label_longModeInterrupt;
 121         } else {
 122             entry = extern_label_legacyModeInterrupt;
 123         }
 124         tc->setIntReg(INTREG_MICRO(1), vector);
 125         tc->setIntReg(INTREG_MICRO(7), tc->readPC());
 126         if (errorCode != (uint64_t)(-1)) {
 127             tc->setIntReg(INTREG_MICRO(15), errorCode);
 128         }
 129         tc->setMicroPC(romMicroPC(entry));
 130         tc->setNextMicroPC(romMicroPC(entry) + 1);
 131     }
 132
 133     void FakeITLBFault::invoke(ThreadContext * tc)
 134     {
 135         // Start the page table walker.
 136         tc->getITBPtr()->walk(tc, vaddr);
 137     }
 138
 139     void FakeDTLBFault::invoke(ThreadContext * tc)
 140     {
 141         // Start the page table walker.
 142         tc->getDTBPtr()->walk(tc, vaddr);
 143     }
 144
 145 #else // !FULL_SYSTEM
 146     void FakeITLBFault::invoke(ThreadContext * tc)
 147     {
 148         DPRINTF(TLB, "Invoking an ITLB fault for address %#x at pc %#x.\n",
 149                 vaddr, tc->readPC());
 150         Process *p = tc->getProcessPtr();
 151         TlbEntry entry;
 152         bool success = p->pTable->lookup(vaddr, entry);
 153         if(!success) {
 154             panic("Tried to execute unmapped address %#x.\n", vaddr);
 155         } else {
 156             Addr alignedVaddr = p->pTable->pageAlign(vaddr);
 157             DPRINTF(TLB, "Mapping %#x to %#x\n", alignedVaddr,
 158                     entry.pageStart());
 159             tc->getITBPtr()->insert(alignedVaddr, entry);
 160         }
 161     }
 162
 163     void FakeDTLBFault::invoke(ThreadContext * tc)
 164     {
 165         DPRINTF(TLB, "Invoking an DTLB fault for address %#x at pc %#x.\n",
 166                 vaddr, tc->readPC());
 167         Process *p = tc->getProcessPtr();
 168         TlbEntry entry;
 169         bool success = p->pTable->lookup(vaddr, entry);
 170         if(!success) {
 171             p->checkAndAllocNextPage(vaddr);
 172             success = p->pTable->lookup(vaddr, entry);
 173         }
 174         if(!success) {
 175             panic("Tried to access unmapped address %#x.\n", vaddr);
 176         } else {
 177             Addr alignedVaddr = p->pTable->pageAlign(vaddr);
 178             DPRINTF(TLB, "Mapping %#x to %#x\n", alignedVaddr,
 179                     entry.pageStart());
 180             tc->getDTBPtr()->insert(alignedVaddr, entry);
 181         }
 182     }
 183 #endif
 184 } // namespace X86ISA
 185