ARM: Make the ARM native tracer stop M5 if control diverges.
If the control flow of M5's executable and statetrace's target process get out of sync even a little, there will be a LOT of output, very little of which will be useful. There's also almost no hope for recovery. In those cases, we might as well give up and not generate a huge, mostly worthless trace file.
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3 changed files with 20 additions and 1 deletions
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@ -33,3 +33,5 @@ from NativeTrace import NativeTrace
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class ArmNativeTrace(NativeTrace):
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type = 'ArmNativeTrace'
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cxx_class = 'Trace::ArmNativeTrace'
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stop_on_pc_error = Param.Bool(True,
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"Stop M5 if it and statetrace's pcs are different")
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@ -162,6 +162,11 @@ Trace::ArmNativeTrace::check(NativeTraceRecord *record)
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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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@ -33,6 +33,7 @@
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#include "base/types.hh"
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#include "cpu/nativetrace.hh"
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#include "params/ArmNativeTrace.hh"
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namespace Trace {
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@ -88,8 +89,19 @@ class ArmNativeTrace : public NativeTrace
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ThreadState nState, mState;
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bool stopOnPCError;
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public:
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ArmNativeTrace(const Params *p) : NativeTrace(p)
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typedef ArmNativeTraceParams Params;
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const Params *
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params() const
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{
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return dynamic_cast<const Params *>(_params);
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}
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ArmNativeTrace(const Params *p) :
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NativeTrace(p), stopOnPCError(p->stop_on_pc_error)
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{}
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void check(NativeTraceRecord *record);
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