| /* |
| * Copyright (c) 2010-2011, 2014, 2016-2017 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. |
| */ |
| |
| #include "arch/arm/nativetrace.hh" |
| |
| #include "arch/arm/regs/cc.hh" |
| #include "arch/arm/regs/int.hh" |
| #include "arch/arm/regs/misc.hh" |
| #include "arch/arm/regs/vec.hh" |
| #include "base/compiler.hh" |
| #include "cpu/thread_context.hh" |
| #include "debug/ExecRegDelta.hh" |
| #include "params/ArmNativeTrace.hh" |
| #include "sim/byteswap.hh" |
| |
| namespace gem5 |
| { |
| |
| using namespace ArmISA; |
| |
| namespace Trace { |
| |
| [[maybe_unused]] static const char *regNames[] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| "r8", "r9", "r10", "fp", "r12", "sp", "lr", "pc", |
| "cpsr", "f0", "f1", "f2", "f3", "f4", "f5", "f6", |
| "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", |
| "f15", "f16", "f17", "f18", "f19", "f20", "f21", "f22", |
| "f23", "f24", "f25", "f26", "f27", "f28", "f29", "f30", |
| "f31", "fpscr" |
| }; |
| |
| void |
| Trace::ArmNativeTrace::ThreadState::update(NativeTrace *parent) |
| { |
| oldState = state[current]; |
| current = (current + 1) % 2; |
| newState = state[current]; |
| |
| memcpy(newState, oldState, sizeof(state[0])); |
| |
| uint64_t diffVector; |
| parent->read(&diffVector, sizeof(diffVector)); |
| diffVector = letoh(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; |
| } |
| |
| uint64_t values[changes]; |
| parent->read(values, sizeof(values)); |
| int pos = 0; |
| for (int i = 0; i < STATE_NUMVALS; i++) { |
| if (changed[i]) { |
| newState[i] = letoh(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->getReg(intRegClass[i]); |
| changed[i] = (oldState[i] != newState[i]); |
| } |
| |
| //R15, aliased with the PC |
| newState[STATE_PC] = tc->pcState().as<ArmISA::PCState>().npc(); |
| changed[STATE_PC] = (newState[STATE_PC] != oldState[STATE_PC]); |
| |
| //CPSR |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| cpsr.nz = tc->getReg(cc_reg::Nz); |
| cpsr.c = tc->getReg(cc_reg::C); |
| cpsr.v = tc->getReg(cc_reg::V); |
| cpsr.ge = tc->getReg(cc_reg::Ge); |
| |
| newState[STATE_CPSR] = cpsr; |
| changed[STATE_CPSR] = (newState[STATE_CPSR] != oldState[STATE_CPSR]); |
| |
| for (int i = 0; i < NumVecV7ArchRegs; i++) { |
| ArmISA::VecRegContainer vec_container; |
| tc->getReg(vecRegClass[i], &vec_container); |
| auto *vec = vec_container.as<uint64_t>(); |
| newState[STATE_F0 + 2*i] = vec[0]; |
| newState[STATE_F0 + 2*i + 1] = vec[1]; |
| } |
| newState[STATE_FPSCR] = tc->readMiscRegNoEffect(MISCREG_FPSCR) | |
| tc->getReg(cc_reg::Fp); |
| } |
| |
| 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->pcState().as<ArmISA::PCState>().npc() > 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]) { |
| 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; |
| } |
| |
| errorFound = true; |
| |
| #ifndef NDEBUG |
| const char *vergence = " "; |
| if (oldMatch && !newMatch) { |
| vergence = "<>"; |
| } else if (!oldMatch && newMatch) { |
| vergence = "><"; |
| } |
| |
| 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]); |
| } |
| #endif |
| } |
| } |
| 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 |
| } // namespace gem5 |
