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/*
* Copyright (c) 2007 The Hewlett-Packard Development Company
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2003-2007 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.
*/
#include "arch/x86/faults.hh"
#include "arch/x86/generated/decoder.hh"
#include "arch/x86/insts/static_inst.hh"
#include "arch/x86/mmu.hh"
#include "arch/x86/regs/misc.hh"
#include "base/loader/symtab.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "debug/Faults.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
namespace gem5
{
namespace X86ISA
{
void
X86FaultBase::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (!FullSystem) {
FaultBase::invoke(tc, inst);
return;
}
PCState pc = tc->pcState().as<PCState>();
DPRINTF(Faults, "RIP %#x: vector %d: %s\n", pc.pc(), vector, describe());
using namespace X86ISAInst::rom_labels;
HandyM5Reg m5reg = tc->readMiscRegNoEffect(misc_reg::M5Reg);
MicroPC entry;
if (m5reg.mode == LongMode) {
entry = extern_label_longModeInterrupt;
} else {
if (m5reg.submode == RealMode)
entry = extern_label_realModeInterrupt;
else
entry = extern_label_legacyModeInterrupt;
}
tc->setReg(intRegMicro(1), vector);
Addr cs_base = tc->readMiscRegNoEffect(misc_reg::CsEffBase);
tc->setReg(intRegMicro(7), pc.pc() - cs_base);
if (errorCode != (uint64_t)(-1)) {
if (m5reg.mode == LongMode) {
entry = extern_label_longModeInterruptWithError;
} else {
panic("Legacy mode interrupts with error codes "
"aren't implemented.");
}
tc->setReg(intRegMicro(15), errorCode);
}
pc.upc(romMicroPC(entry));
pc.nupc(romMicroPC(entry) + 1);
tc->pcState(pc);
}
std::string
X86FaultBase::describe() const
{
std::stringstream ss;
ccprintf(ss, "%s", mnemonic());
if (errorCode != (uint64_t)(-1))
ccprintf(ss, "(%#x)", errorCode);
return ss.str();
}
void
X86Trap::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
// This is the same as a fault, but it happens -after- the
// instruction.
X86FaultBase::invoke(tc);
}
void
X86Abort::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
panic("Abort exception!");
}
void
InvalidOpcode::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
X86Fault::invoke(tc, inst);
} else {
auto *xsi = static_cast<X86StaticInst *>(inst.get());
panic("Unrecognized/invalid instruction executed:\n %s",
xsi->machInst);
}
}
void
PageFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
// Invalidate any matching TLB entries before handling the page fault.
tc->getMMUPtr()->demapPage(addr, 0);
HandyM5Reg m5reg = tc->readMiscRegNoEffect(misc_reg::M5Reg);
X86FaultBase::invoke(tc);
// If something bad happens while trying to enter the page fault
// handler, I'm pretty sure that's a double fault and then all
// bets are off. That means it should be safe to update this
// state now.
if (m5reg.mode == LongMode)
tc->setMiscReg(misc_reg::Cr2, addr);
else
tc->setMiscReg(misc_reg::Cr2, (uint32_t)addr);
} else if (!tc->getProcessPtr()->fixupFault(addr)) {
PageFaultErrorCode code = errorCode;
const char *modeStr = "";
if (code.fetch)
modeStr = "execute";
else if (code.write)
modeStr = "write";
else
modeStr = "read";
// print information about what we are panic'ing on
if (!inst) {
panic("Tried to %s unmapped address %#x.", modeStr, addr);
} else {
panic("Tried to %s unmapped address %#x.\nPC: %#x, Instr: %s",
modeStr, addr, tc->pcState(),
inst->disassemble(tc->pcState().instAddr(),
&loader::debugSymbolTable));
}
}
}
std::string
PageFault::describe() const
{
std::stringstream ss;
ccprintf(ss, "%s at %#x", X86FaultBase::describe(), addr);
return ss.str();
}
void
InitInterrupt::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
DPRINTF(Faults, "Init interrupt.\n");
// The otherwise unmodified integer registers should be set to 0.
for (int index = 0; index < int_reg::NumArchRegs; index++) {
tc->setReg(RegId(IntRegClass, index), (RegVal)0);
}
CR0 cr0 = tc->readMiscReg(misc_reg::Cr0);
CR0 newCR0 = 1 << 4;
newCR0.cd = cr0.cd;
newCR0.nw = cr0.nw;
tc->setMiscReg(misc_reg::Cr0, newCR0);
tc->setMiscReg(misc_reg::Cr2, 0);
tc->setMiscReg(misc_reg::Cr3, 0);
tc->setMiscReg(misc_reg::Cr4, 0);
tc->setMiscReg(misc_reg::Rflags, 0x0000000000000002ULL);
tc->setMiscReg(misc_reg::Efer, 0);
SegAttr dataAttr = 0;
dataAttr.dpl = 0;
dataAttr.unusable = 0;
dataAttr.defaultSize = 0;
dataAttr.longMode = 0;
dataAttr.avl = 0;
dataAttr.granularity = 0;
dataAttr.present = 1;
dataAttr.type = 3;
dataAttr.writable = 1;
dataAttr.readable = 1;
dataAttr.expandDown = 0;
dataAttr.system = 1;
for (int seg = 0; seg != segment_idx::NumIdxs; seg++) {
tc->setMiscReg(misc_reg::segSel(seg), 0);
tc->setMiscReg(misc_reg::segBase(seg), 0);
tc->setMiscReg(misc_reg::segEffBase(seg), 0);
tc->setMiscReg(misc_reg::segLimit(seg), 0xffff);
tc->setMiscReg(misc_reg::segAttr(seg), dataAttr);
}
SegAttr codeAttr = 0;
codeAttr.dpl = 0;
codeAttr.unusable = 0;
codeAttr.defaultSize = 0;
codeAttr.longMode = 0;
codeAttr.avl = 0;
codeAttr.granularity = 0;
codeAttr.present = 1;
codeAttr.type = 10;
codeAttr.writable = 0;
codeAttr.readable = 1;
codeAttr.expandDown = 0;
codeAttr.system = 1;
tc->setMiscReg(misc_reg::Cs, 0xf000);
tc->setMiscReg(misc_reg::CsBase, 0x00000000ffff0000ULL);
tc->setMiscReg(misc_reg::CsEffBase, 0x00000000ffff0000ULL);
// This has the base value pre-added.
tc->setMiscReg(misc_reg::CsLimit, 0xffffffff);
tc->setMiscReg(misc_reg::CsAttr, codeAttr);
PCState pc(0x000000000000fff0ULL + tc->readMiscReg(misc_reg::CsBase));
tc->pcState(pc);
tc->setMiscReg(misc_reg::TsgBase, 0);
tc->setMiscReg(misc_reg::TsgLimit, 0xffff);
tc->setMiscReg(misc_reg::IdtrBase, 0);
tc->setMiscReg(misc_reg::IdtrLimit, 0xffff);
SegAttr tslAttr = 0;
tslAttr.unusable = 1;
tslAttr.present = 1;
tslAttr.type = 2; // LDT
tc->setMiscReg(misc_reg::Tsl, 0);
tc->setMiscReg(misc_reg::TslBase, 0);
tc->setMiscReg(misc_reg::TslLimit, 0xffff);
tc->setMiscReg(misc_reg::TslAttr, tslAttr);
SegAttr trAttr = 0;
trAttr.unusable = 0;
trAttr.present = 1;
trAttr.type = 3; // Busy 16-bit TSS
tc->setMiscReg(misc_reg::Tr, 0);
tc->setMiscReg(misc_reg::TrBase, 0);
tc->setMiscReg(misc_reg::TrLimit, 0xffff);
tc->setMiscReg(misc_reg::TrAttr, trAttr);
// This value should be the family/model/stepping of the processor.
// (page 418). It should be consistent with the value from CPUID, but
// the actual value probably doesn't matter much.
tc->setReg(int_reg::Rdx, (RegVal)0);
tc->setMiscReg(misc_reg::Dr0, 0);
tc->setMiscReg(misc_reg::Dr1, 0);
tc->setMiscReg(misc_reg::Dr2, 0);
tc->setMiscReg(misc_reg::Dr3, 0);
tc->setMiscReg(misc_reg::Dr6, 0x00000000ffff0ff0ULL);
tc->setMiscReg(misc_reg::Dr7, 0x0000000000000400ULL);
tc->setMiscReg(misc_reg::Mxcsr, 0x1f80);
// Flag all elements on the x87 stack as empty.
tc->setMiscReg(misc_reg::Ftw, 0xFFFF);
// Update the handy M5 Reg.
tc->setMiscReg(misc_reg::M5Reg, 0);
MicroPC entry = X86ISAInst::rom_labels::extern_label_initIntHalt;
pc.upc(romMicroPC(entry));
pc.nupc(romMicroPC(entry) + 1);
tc->pcState(pc);
}
void
StartupInterrupt::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
DPRINTF(Faults, "Startup interrupt with vector %#x.\n", vector);
HandyM5Reg m5Reg = tc->readMiscReg(misc_reg::M5Reg);
if (m5Reg.mode != LegacyMode || m5Reg.submode != RealMode) {
panic("Startup IPI recived outside of real mode. "
"Don't know what to do. %d, %d", m5Reg.mode, m5Reg.submode);
}
tc->setMiscReg(misc_reg::Cs, vector << 8);
tc->setMiscReg(misc_reg::CsBase, vector << 12);
tc->setMiscReg(misc_reg::CsEffBase, vector << 12);
// This has the base value pre-added.
tc->setMiscReg(misc_reg::CsLimit, 0xffff);
tc->pcState(tc->readMiscReg(misc_reg::CsBase));
}
} // namespace X86ISA
} // namespace gem5