nativetrace.cc revision 8271:1d3733d3acee
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Gabe Black 41 */ 42 43#include "arch/arm/isa_traits.hh" 44#include "arch/arm/miscregs.hh" 45#include "arch/arm/nativetrace.hh" 46#include "cpu/thread_context.hh" 47#include "debug/ExecRegDelta.hh" 48#include "params/ArmNativeTrace.hh" 49#include "sim/byteswap.hh" 50 51namespace Trace { 52 53#if TRACING_ON 54static const char *regNames[] = { 55 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 56 "r8", "r9", "r10", "fp", "r12", "sp", "lr", "pc", 57 "cpsr", "f0", "f1", "f2", "f3", "f4", "f5", "f6", 58 "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", 59 "f15", "f16", "f17", "f18", "f19", "f20", "f21", "f22", 60 "f23", "f24", "f25", "f26", "f27", "f28", "f29", "f30", 61 "f31", "fpscr" 62}; 63#endif 64 65void 66Trace::ArmNativeTrace::ThreadState::update(NativeTrace *parent) 67{ 68 oldState = state[current]; 69 current = (current + 1) % 2; 70 newState = state[current]; 71 72 memcpy(newState, oldState, sizeof(state[0])); 73 74 uint64_t diffVector; 75 parent->read(&diffVector, sizeof(diffVector)); 76 diffVector = ArmISA::gtoh(diffVector); 77 78 int changes = 0; 79 for (int i = 0; i < STATE_NUMVALS; i++) { 80 if (diffVector & 0x1) { 81 changed[i] = true; 82 changes++; 83 } else { 84 changed[i] = false; 85 } 86 diffVector >>= 1; 87 } 88 89 uint64_t values[changes]; 90 parent->read(values, sizeof(values)); 91 int pos = 0; 92 for (int i = 0; i < STATE_NUMVALS; i++) { 93 if (changed[i]) { 94 newState[i] = ArmISA::gtoh(values[pos++]); 95 changed[i] = (newState[i] != oldState[i]); 96 } 97 } 98} 99 100void 101Trace::ArmNativeTrace::ThreadState::update(ThreadContext *tc) 102{ 103 oldState = state[current]; 104 current = (current + 1) % 2; 105 newState = state[current]; 106 107 // Regular int regs 108 for (int i = 0; i < 15; i++) { 109 newState[i] = tc->readIntReg(i); 110 changed[i] = (oldState[i] != newState[i]); 111 } 112 113 //R15, aliased with the PC 114 newState[STATE_PC] = tc->pcState().npc(); 115 changed[STATE_PC] = (newState[STATE_PC] != oldState[STATE_PC]); 116 117 //CPSR 118 newState[STATE_CPSR] = tc->readMiscReg(MISCREG_CPSR) | 119 tc->readIntReg(INTREG_CONDCODES); 120 changed[STATE_CPSR] = (newState[STATE_CPSR] != oldState[STATE_CPSR]); 121 122 for (int i = 0; i < NumFloatArchRegs; i += 2) { 123 newState[STATE_F0 + (i >> 1)] = 124 static_cast<uint64_t>(tc->readFloatRegBits(i + 1)) << 32 | 125 tc->readFloatRegBits(i); 126 } 127 newState[STATE_FPSCR] = tc->readMiscRegNoEffect(MISCREG_FPSCR) | 128 tc->readIntReg(INTREG_FPCONDCODES); 129} 130 131void 132Trace::ArmNativeTrace::check(NativeTraceRecord *record) 133{ 134 ThreadContext *tc = record->getThread(); 135 // This area is read only on the target. It can't stop there to tell us 136 // what's going on, so we should skip over anything there also. 137 if (tc->nextInstAddr() > 0xffff0000) 138 return; 139 nState.update(this); 140 mState.update(tc); 141 142 // If a syscall just happened native trace needs another tick 143 if ((mState.oldState[STATE_PC] == nState.oldState[STATE_PC]) && 144 (mState.newState[STATE_PC] - 4 == nState.newState[STATE_PC])) { 145 DPRINTF(ExecRegDelta, "Advancing to match PCs after syscall\n"); 146 nState.update(this); 147 148 } 149 150 bool errorFound = false; 151 // Regular int regs 152 for (int i = 0; i < STATE_NUMVALS; i++) { 153 if (nState.changed[i] || mState.changed[i]) { 154 const char *vergence = " "; 155 bool oldMatch = (mState.oldState[i] == nState.oldState[i]); 156 bool newMatch = (mState.newState[i] == nState.newState[i]); 157 if (oldMatch && newMatch) { 158 // The more things change, the more they stay the same. 159 continue; 160 } else if (oldMatch && !newMatch) { 161 vergence = "<>"; 162 } else if (!oldMatch && newMatch) { 163 vergence = "><"; 164 } 165 errorFound = true; 166 if (!nState.changed[i]) { 167 DPRINTF(ExecRegDelta, "%s [%5s] "\ 168 "Native: %#010x "\ 169 "M5: %#010x => %#010x\n", 170 vergence, regNames[i], 171 nState.newState[i], 172 mState.oldState[i], mState.newState[i]); 173 } else if (!mState.changed[i]) { 174 DPRINTF(ExecRegDelta, "%s [%5s] "\ 175 "Native: %#010x => %#010x "\ 176 "M5: %#010x \n", 177 vergence, regNames[i], 178 nState.oldState[i], nState.newState[i], 179 mState.newState[i]); 180 } else { 181 DPRINTF(ExecRegDelta, "%s [%5s] "\ 182 "Native: %#010x => %#010x "\ 183 "M5: %#010x => %#010x\n", 184 vergence, regNames[i], 185 nState.oldState[i], nState.newState[i], 186 mState.oldState[i], mState.newState[i]); 187 } 188 } 189 } 190 if (errorFound) { 191 StaticInstPtr inst = record->getStaticInst(); 192 assert(inst); 193 bool ran = true; 194 if (inst->isMicroop()) { 195 ran = false; 196 inst = record->getMacroStaticInst(); 197 } 198 assert(inst); 199 record->traceInst(inst, ran); 200 201 bool pcError = (mState.newState[STATE_PC] != 202 nState.newState[STATE_PC]); 203 if (stopOnPCError && pcError) 204 panic("Native trace detected an error in control flow!"); 205 } 206} 207 208} // namespace Trace 209 210//////////////////////////////////////////////////////////////////////// 211// 212// ExeTracer Simulation Object 213// 214Trace::ArmNativeTrace * 215ArmNativeTraceParams::create() 216{ 217 return new Trace::ArmNativeTrace(this); 218}; 219