/* * Copyright (c) 2010 ARM Limited * 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) 2006 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/arm/isa_traits.hh" #include "arch/arm/miscregs.hh" #include "arch/arm/nativetrace.hh" #include "cpu/thread_context.hh" #include "params/ArmNativeTrace.hh" #include "sim/byteswap.hh" namespace Trace { #if TRACING_ON static const char *regNames[] = { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "fp", "r12", "sp", "lr", "pc", "cpsr" }; #endif void Trace::ArmNativeTrace::ThreadState::update(NativeTrace *parent) { oldState = state[current]; current = (current + 1) % 2; newState = state[current]; memcpy(newState, oldState, sizeof(state[0])); uint32_t diffVector; parent->read(&diffVector, sizeof(diffVector)); diffVector = ArmISA::gtoh(diffVector); int changes = 0; for (int i = 0; i < STATE_NUMVALS; i++) { if (diffVector & 0x1) { changed[i] = true; changes++; } else { changed[i] = false; } diffVector >>= 1; } uint32_t values[changes]; parent->read(values, sizeof(values)); int pos = 0; for (int i = 0; i < STATE_NUMVALS; i++) { if (changed[i]) { newState[i] = ArmISA::gtoh(values[pos++]); changed[i] = (newState[i] != oldState[i]); } } } void Trace::ArmNativeTrace::ThreadState::update(ThreadContext *tc) { oldState = state[current]; current = (current + 1) % 2; newState = state[current]; // Regular int regs for (int i = 0; i < 15; i++) { newState[i] = tc->readIntReg(i); changed[i] = (oldState[i] != newState[i]); } //R15, aliased with the PC newState[STATE_PC] = tc->pcState().npc(); changed[STATE_PC] = (newState[STATE_PC] != oldState[STATE_PC]); //CPSR newState[STATE_CPSR] = tc->readMiscReg(MISCREG_CPSR) | tc->readIntReg(INTREG_CONDCODES); changed[STATE_CPSR] = (newState[STATE_CPSR] != oldState[STATE_CPSR]); } void Trace::ArmNativeTrace::check(NativeTraceRecord *record) { ThreadContext *tc = record->getThread(); // This area is read only on the target. It can't stop there to tell us // what's going on, so we should skip over anything there also. if (tc->nextInstAddr() > 0xffff0000) return; nState.update(this); mState.update(tc); // If a syscall just happened native trace needs another tick if ((mState.oldState[STATE_PC] == nState.oldState[STATE_PC]) && (mState.newState[STATE_PC] - 4 == nState.newState[STATE_PC])) { DPRINTF(ExecRegDelta, "Advancing to match PCs after syscall\n"); nState.update(this); } bool errorFound = false; // Regular int regs for (int i = 0; i < STATE_NUMVALS; i++) { if (nState.changed[i] || mState.changed[i]) { const char *vergence = " "; bool oldMatch = (mState.oldState[i] == nState.oldState[i]); bool newMatch = (mState.newState[i] == nState.newState[i]); if (oldMatch && newMatch) { // The more things change, the more they stay the same. continue; } else if (oldMatch && !newMatch) { vergence = "<>"; } else if (!oldMatch && newMatch) { vergence = "><"; } errorFound = true; if (!nState.changed[i]) { DPRINTF(ExecRegDelta, "%s [%5s] "\ "Native: %#010x "\ "M5: %#010x => %#010x\n", vergence, regNames[i], nState.newState[i], mState.oldState[i], mState.newState[i]); } else if (!mState.changed[i]) { DPRINTF(ExecRegDelta, "%s [%5s] "\ "Native: %#010x => %#010x "\ "M5: %#010x \n", vergence, regNames[i], nState.oldState[i], nState.newState[i], mState.newState[i]); } else { DPRINTF(ExecRegDelta, "%s [%5s] "\ "Native: %#010x => %#010x "\ "M5: %#010x => %#010x\n", vergence, regNames[i], nState.oldState[i], nState.newState[i], mState.oldState[i], mState.newState[i]); } } } if (errorFound) { StaticInstPtr inst = record->getStaticInst(); assert(inst); bool ran = true; if (inst->isMicroop()) { ran = false; inst = record->getMacroStaticInst(); } assert(inst); record->traceInst(inst, ran); bool pcError = (mState.newState[STATE_PC] != nState.newState[STATE_PC]); if (stopOnPCError && pcError) panic("Native trace detected an error in control flow!"); } } } /* namespace Trace */ //////////////////////////////////////////////////////////////////////// // // ExeTracer Simulation Object // Trace::ArmNativeTrace * ArmNativeTraceParams::create() { return new Trace::ArmNativeTrace(this); };