2178859b76
This change splits out the condcodes from being one monolithic register into three blocks that are updated independently. This allows CPUs to not have to do RMW operations on the flags registers for instructions that don't write all flags.
221 lines
8.2 KiB
C++
221 lines
8.2 KiB
C++
/*
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* Copyright (c) 2010 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Gabe Black
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*/
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#include "arch/arm/isa_traits.hh"
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#include "arch/arm/miscregs.hh"
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#include "arch/arm/nativetrace.hh"
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#include "cpu/thread_context.hh"
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#include "debug/ExecRegDelta.hh"
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#include "params/ArmNativeTrace.hh"
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#include "sim/byteswap.hh"
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namespace Trace {
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#if TRACING_ON
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static const char *regNames[] = {
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"r8", "r9", "r10", "fp", "r12", "sp", "lr", "pc",
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"cpsr", "f0", "f1", "f2", "f3", "f4", "f5", "f6",
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"f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14",
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"f15", "f16", "f17", "f18", "f19", "f20", "f21", "f22",
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"f23", "f24", "f25", "f26", "f27", "f28", "f29", "f30",
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"f31", "fpscr"
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};
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#endif
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void
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Trace::ArmNativeTrace::ThreadState::update(NativeTrace *parent)
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{
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oldState = state[current];
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current = (current + 1) % 2;
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newState = state[current];
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memcpy(newState, oldState, sizeof(state[0]));
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uint64_t diffVector;
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parent->read(&diffVector, sizeof(diffVector));
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diffVector = ArmISA::gtoh(diffVector);
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int changes = 0;
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for (int i = 0; i < STATE_NUMVALS; i++) {
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if (diffVector & 0x1) {
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changed[i] = true;
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changes++;
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} else {
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changed[i] = false;
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}
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diffVector >>= 1;
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}
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uint64_t values[changes];
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parent->read(values, sizeof(values));
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int pos = 0;
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for (int i = 0; i < STATE_NUMVALS; i++) {
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if (changed[i]) {
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newState[i] = ArmISA::gtoh(values[pos++]);
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changed[i] = (newState[i] != oldState[i]);
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}
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}
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}
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void
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Trace::ArmNativeTrace::ThreadState::update(ThreadContext *tc)
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{
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oldState = state[current];
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current = (current + 1) % 2;
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newState = state[current];
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// Regular int regs
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for (int i = 0; i < 15; i++) {
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newState[i] = tc->readIntReg(i);
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changed[i] = (oldState[i] != newState[i]);
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}
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//R15, aliased with the PC
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newState[STATE_PC] = tc->pcState().npc();
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changed[STATE_PC] = (newState[STATE_PC] != oldState[STATE_PC]);
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//CPSR
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newState[STATE_CPSR] = tc->readMiscReg(MISCREG_CPSR) |
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tc->readIntReg(INTREG_CONDCODES_F) |
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tc->readIntReg(INTREG_CONDCODES_Q) |
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tc->readIntReg(INTREG_CONDCODES_GE);
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changed[STATE_CPSR] = (newState[STATE_CPSR] != oldState[STATE_CPSR]);
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for (int i = 0; i < NumFloatArchRegs; i += 2) {
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newState[STATE_F0 + (i >> 1)] =
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static_cast<uint64_t>(tc->readFloatRegBits(i + 1)) << 32 |
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tc->readFloatRegBits(i);
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}
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newState[STATE_FPSCR] = tc->readMiscRegNoEffect(MISCREG_FPSCR) |
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tc->readIntReg(INTREG_FPCONDCODES);
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}
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void
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Trace::ArmNativeTrace::check(NativeTraceRecord *record)
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{
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ThreadContext *tc = record->getThread();
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// This area is read only on the target. It can't stop there to tell us
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// what's going on, so we should skip over anything there also.
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if (tc->nextInstAddr() > 0xffff0000)
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return;
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nState.update(this);
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mState.update(tc);
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// If a syscall just happened native trace needs another tick
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if ((mState.oldState[STATE_PC] == nState.oldState[STATE_PC]) &&
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(mState.newState[STATE_PC] - 4 == nState.newState[STATE_PC])) {
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DPRINTF(ExecRegDelta, "Advancing to match PCs after syscall\n");
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nState.update(this);
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}
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bool errorFound = false;
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// Regular int regs
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for (int i = 0; i < STATE_NUMVALS; i++) {
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if (nState.changed[i] || mState.changed[i]) {
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const char *vergence = " ";
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bool oldMatch = (mState.oldState[i] == nState.oldState[i]);
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bool newMatch = (mState.newState[i] == nState.newState[i]);
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if (oldMatch && newMatch) {
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// The more things change, the more they stay the same.
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continue;
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} else if (oldMatch && !newMatch) {
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vergence = "<>";
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} else if (!oldMatch && newMatch) {
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vergence = "><";
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}
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errorFound = true;
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if (!nState.changed[i]) {
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DPRINTF(ExecRegDelta, "%s [%5s] "\
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"Native: %#010x "\
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"M5: %#010x => %#010x\n",
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vergence, regNames[i],
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nState.newState[i],
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mState.oldState[i], mState.newState[i]);
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} else if (!mState.changed[i]) {
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DPRINTF(ExecRegDelta, "%s [%5s] "\
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"Native: %#010x => %#010x "\
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"M5: %#010x \n",
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vergence, regNames[i],
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nState.oldState[i], nState.newState[i],
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mState.newState[i]);
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} else {
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DPRINTF(ExecRegDelta, "%s [%5s] "\
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"Native: %#010x => %#010x "\
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"M5: %#010x => %#010x\n",
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vergence, regNames[i],
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nState.oldState[i], nState.newState[i],
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mState.oldState[i], mState.newState[i]);
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}
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}
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}
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if (errorFound) {
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StaticInstPtr inst = record->getStaticInst();
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assert(inst);
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bool ran = true;
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if (inst->isMicroop()) {
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ran = false;
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inst = record->getMacroStaticInst();
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}
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assert(inst);
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record->traceInst(inst, ran);
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bool pcError = (mState.newState[STATE_PC] !=
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nState.newState[STATE_PC]);
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if (stopOnPCError && pcError)
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panic("Native trace detected an error in control flow!");
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}
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}
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} // namespace Trace
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////////////////////////////////////////////////////////////////////////
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//
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// ExeTracer Simulation Object
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//
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Trace::ArmNativeTrace *
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ArmNativeTraceParams::create()
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{
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return new Trace::ArmNativeTrace(this);
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};
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