| /* |
| * 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. |
| * |
| * Authors: Gabe Black |
| */ |
| |
| #include "arch/x86/faults.hh" |
| |
| #include "arch/x86/generated/decoder.hh" |
| #include "arch/x86/isa_traits.hh" |
| #include "base/loader/symtab.hh" |
| #include "base/trace.hh" |
| #include "cpu/thread_context.hh" |
| #include "debug/Faults.hh" |
| #include "sim/full_system.hh" |
| |
| namespace X86ISA |
| { |
| void X86FaultBase::invoke(ThreadContext * tc, const StaticInstPtr &inst) |
| { |
| if (!FullSystem) { |
| FaultBase::invoke(tc, inst); |
| return; |
| } |
| |
| PCState pcState = tc->pcState(); |
| Addr pc = pcState.pc(); |
| DPRINTF(Faults, "RIP %#x: vector %d: %s\n", |
| pc, vector, describe()); |
| using namespace X86ISAInst::RomLabels; |
| HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG); |
| MicroPC entry; |
| if (m5reg.mode == LongMode) { |
| if (isSoft()) { |
| entry = extern_label_longModeSoftInterrupt; |
| } else { |
| entry = extern_label_longModeInterrupt; |
| } |
| } else { |
| entry = extern_label_legacyModeInterrupt; |
| } |
| tc->setIntReg(INTREG_MICRO(1), vector); |
| tc->setIntReg(INTREG_MICRO(7), pc); |
| if (errorCode != (uint64_t)(-1)) { |
| if (m5reg.mode == LongMode) { |
| entry = extern_label_longModeInterruptWithError; |
| } else { |
| panic("Legacy mode interrupts with error codes " |
| "aren't implementde.\n"); |
| } |
| // Software interrupts shouldn't have error codes. If one |
| // does, there would need to be microcode to set it up. |
| assert(!isSoft()); |
| tc->setIntReg(INTREG_MICRO(15), errorCode); |
| } |
| pcState.upc(romMicroPC(entry)); |
| pcState.nupc(romMicroPC(entry) + 1); |
| tc->pcState(pcState); |
| } |
| |
| 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) |
| { |
| X86FaultBase::invoke(tc); |
| if (!FullSystem) |
| return; |
| |
| // This is the same as a fault, but it happens -after- the |
| // instruction. |
| PCState pc = tc->pcState(); |
| pc.uEnd(); |
| } |
| |
| 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 { |
| panic("Unrecognized/invalid instruction executed:\n %s", |
| inst->machInst); |
| } |
| } |
| |
| void PageFault::invoke(ThreadContext * tc, const StaticInstPtr &inst) |
| { |
| if (FullSystem) { |
| /* Invalidate any matching TLB entries before handling the page fault */ |
| tc->getITBPtr()->demapPage(addr, 0); |
| tc->getDTBPtr()->demapPage(addr, 0); |
| HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG); |
| 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(MISCREG_CR2, addr); |
| } else { |
| tc->setMiscReg(MISCREG_CR2, (uint32_t)addr); |
| } |
| } else { |
| 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.\n", modeStr, addr); |
| } else { |
| panic("Tried to %s unmapped address %#x.\nPC: %#x, Instr: %s", |
| modeStr, addr, tc->pcState().pc(), |
| inst->disassemble(tc->pcState().pc(), 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 < NUM_INTREGS; index++) { |
| tc->setIntReg(index, 0); |
| } |
| |
| CR0 cr0 = tc->readMiscReg(MISCREG_CR0); |
| CR0 newCR0 = 1 << 4; |
| newCR0.cd = cr0.cd; |
| newCR0.nw = cr0.nw; |
| tc->setMiscReg(MISCREG_CR0, newCR0); |
| tc->setMiscReg(MISCREG_CR2, 0); |
| tc->setMiscReg(MISCREG_CR3, 0); |
| tc->setMiscReg(MISCREG_CR4, 0); |
| |
| tc->setMiscReg(MISCREG_RFLAGS, 0x0000000000000002ULL); |
| |
| tc->setMiscReg(MISCREG_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 != NUM_SEGMENTREGS; seg++) { |
| tc->setMiscReg(MISCREG_SEG_SEL(seg), 0); |
| tc->setMiscReg(MISCREG_SEG_BASE(seg), 0); |
| tc->setMiscReg(MISCREG_SEG_EFF_BASE(seg), 0); |
| tc->setMiscReg(MISCREG_SEG_LIMIT(seg), 0xffff); |
| tc->setMiscReg(MISCREG_SEG_ATTR(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(MISCREG_CS, 0xf000); |
| tc->setMiscReg(MISCREG_CS_BASE, |
| 0x00000000ffff0000ULL); |
| tc->setMiscReg(MISCREG_CS_EFF_BASE, |
| 0x00000000ffff0000ULL); |
| // This has the base value pre-added. |
| tc->setMiscReg(MISCREG_CS_LIMIT, 0xffffffff); |
| tc->setMiscReg(MISCREG_CS_ATTR, codeAttr); |
| |
| PCState pc(0x000000000000fff0ULL + tc->readMiscReg(MISCREG_CS_BASE)); |
| tc->pcState(pc); |
| |
| tc->setMiscReg(MISCREG_TSG_BASE, 0); |
| tc->setMiscReg(MISCREG_TSG_LIMIT, 0xffff); |
| |
| tc->setMiscReg(MISCREG_IDTR_BASE, 0); |
| tc->setMiscReg(MISCREG_IDTR_LIMIT, 0xffff); |
| |
| SegAttr tslAttr = 0; |
| tslAttr.present = 1; |
| tslAttr.type = 2; // LDT |
| tc->setMiscReg(MISCREG_TSL, 0); |
| tc->setMiscReg(MISCREG_TSL_BASE, 0); |
| tc->setMiscReg(MISCREG_TSL_LIMIT, 0xffff); |
| tc->setMiscReg(MISCREG_TSL_ATTR, tslAttr); |
| |
| SegAttr trAttr = 0; |
| trAttr.present = 1; |
| trAttr.type = 3; // Busy 16-bit TSS |
| tc->setMiscReg(MISCREG_TR, 0); |
| tc->setMiscReg(MISCREG_TR_BASE, 0); |
| tc->setMiscReg(MISCREG_TR_LIMIT, 0xffff); |
| tc->setMiscReg(MISCREG_TR_ATTR, 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->setIntReg(INTREG_RDX, 0); |
| |
| tc->setMiscReg(MISCREG_DR0, 0); |
| tc->setMiscReg(MISCREG_DR1, 0); |
| tc->setMiscReg(MISCREG_DR2, 0); |
| tc->setMiscReg(MISCREG_DR3, 0); |
| |
| tc->setMiscReg(MISCREG_DR6, 0x00000000ffff0ff0ULL); |
| tc->setMiscReg(MISCREG_DR7, 0x0000000000000400ULL); |
| |
| tc->setMiscReg(MISCREG_MXCSR, 0x1f80); |
| |
| // Flag all elements on the x87 stack as empty. |
| tc->setMiscReg(MISCREG_FTW, 0xFFFF); |
| |
| // Update the handy M5 Reg. |
| tc->setMiscReg(MISCREG_M5_REG, 0); |
| MicroPC entry = X86ISAInst::RomLabels::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(MISCREG_M5_REG); |
| 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(MISCREG_CS, vector << 8); |
| tc->setMiscReg(MISCREG_CS_BASE, vector << 12); |
| tc->setMiscReg(MISCREG_CS_EFF_BASE, vector << 12); |
| // This has the base value pre-added. |
| tc->setMiscReg(MISCREG_CS_LIMIT, 0xffff); |
| |
| tc->pcState(tc->readMiscReg(MISCREG_CS_BASE)); |
| } |
| } // namespace X86ISA |
| |
