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/*
* Copyright (c) 2014-2016 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) 2002-2005 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: Kevin Lim
* Andreas Sandberg
* Mitch Hayenga
*/
#ifndef __CPU_SIMPLE_EXEC_CONTEXT_HH__
#define __CPU_SIMPLE_EXEC_CONTEXT_HH__
#include "arch/registers.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/exec_context.hh"
#include "cpu/reg_class.hh"
#include "cpu/simple/base.hh"
#include "cpu/static_inst_fwd.hh"
#include "cpu/translation.hh"
#include "mem/request.hh"
class BaseSimpleCPU;
class SimpleExecContext : public ExecContext {
protected:
typedef TheISA::CCReg CCReg;
using VecRegContainer = TheISA::VecRegContainer;
using VecElem = TheISA::VecElem;
public:
BaseSimpleCPU *cpu;
SimpleThread* thread;
// This is the offset from the current pc that fetch should be performed
Addr fetchOffset;
// This flag says to stay at the current pc. This is useful for
// instructions which go beyond MachInst boundaries.
bool stayAtPC;
// Branch prediction
TheISA::PCState predPC;
/** PER-THREAD STATS */
// Number of simulated instructions
Counter numInst;
Stats::Scalar numInsts;
Counter numOp;
Stats::Scalar numOps;
// Number of integer alu accesses
Stats::Scalar numIntAluAccesses;
// Number of float alu accesses
Stats::Scalar numFpAluAccesses;
// Number of vector alu accesses
Stats::Scalar numVecAluAccesses;
// Number of function calls/returns
Stats::Scalar numCallsReturns;
// Conditional control instructions;
Stats::Scalar numCondCtrlInsts;
// Number of int instructions
Stats::Scalar numIntInsts;
// Number of float instructions
Stats::Scalar numFpInsts;
// Number of vector instructions
Stats::Scalar numVecInsts;
// Number of integer register file accesses
Stats::Scalar numIntRegReads;
Stats::Scalar numIntRegWrites;
// Number of float register file accesses
Stats::Scalar numFpRegReads;
Stats::Scalar numFpRegWrites;
// Number of vector register file accesses
mutable Stats::Scalar numVecRegReads;
Stats::Scalar numVecRegWrites;
// Number of condition code register file accesses
Stats::Scalar numCCRegReads;
Stats::Scalar numCCRegWrites;
// Number of simulated memory references
Stats::Scalar numMemRefs;
Stats::Scalar numLoadInsts;
Stats::Scalar numStoreInsts;
// Number of idle cycles
Stats::Formula numIdleCycles;
// Number of busy cycles
Stats::Formula numBusyCycles;
// Number of simulated loads
Counter numLoad;
// Number of idle cycles
Stats::Average notIdleFraction;
Stats::Formula idleFraction;
// Number of cycles stalled for I-cache responses
Stats::Scalar icacheStallCycles;
Counter lastIcacheStall;
// Number of cycles stalled for D-cache responses
Stats::Scalar dcacheStallCycles;
Counter lastDcacheStall;
/// @{
/// Total number of branches fetched
Stats::Scalar numBranches;
/// Number of branches predicted as taken
Stats::Scalar numPredictedBranches;
/// Number of misprediced branches
Stats::Scalar numBranchMispred;
/// @}
// Instruction mix histogram by OpClass
Stats::Vector statExecutedInstType;
public:
/** Constructor */
SimpleExecContext(BaseSimpleCPU* _cpu, SimpleThread* _thread)
: cpu(_cpu), thread(_thread), fetchOffset(0), stayAtPC(false),
numInst(0), numOp(0), numLoad(0), lastIcacheStall(0), lastDcacheStall(0)
{ }
/** Reads an integer register. */
RegVal
readIntRegOperand(const StaticInst *si, int idx) override
{
numIntRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isIntReg());
return thread->readIntReg(reg.index());
}
/** Sets an integer register to a value. */
void
setIntRegOperand(const StaticInst *si, int idx, RegVal val) override
{
numIntRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isIntReg());
thread->setIntReg(reg.index(), val);
}
/** Reads a floating point register in its binary format, instead
* of by value. */
RegVal
readFloatRegOperandBits(const StaticInst *si, int idx) override
{
numFpRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isFloatReg());
return thread->readFloatRegBits(reg.index());
}
/** Sets the bits of a floating point register of single width
* to a binary value. */
void
setFloatRegOperandBits(const StaticInst *si, int idx, RegVal val) override
{
numFpRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isFloatReg());
thread->setFloatRegBits(reg.index(), val);
}
/** Reads a vector register. */
const VecRegContainer &
readVecRegOperand(const StaticInst *si, int idx) const override
{
numVecRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isVecReg());
return thread->readVecReg(reg);
}
/** Reads a vector register for modification. */
VecRegContainer &
getWritableVecRegOperand(const StaticInst *si, int idx) override
{
numVecRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isVecReg());
return thread->getWritableVecReg(reg);
}
/** Sets a vector register to a value. */
void
setVecRegOperand(const StaticInst *si, int idx,
const VecRegContainer& val) override
{
numVecRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isVecReg());
thread->setVecReg(reg, val);
}
/** Vector Register Lane Interfaces. */
/** @{ */
/** Reads source vector lane. */
template <typename VecElem>
VecLaneT<VecElem, true>
readVecLaneOperand(const StaticInst *si, int idx) const
{
numVecRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isVecReg());
return thread->readVecLane<VecElem>(reg);
}
/** Reads source vector 8bit operand. */
virtual ConstVecLane8
readVec8BitLaneOperand(const StaticInst *si, int idx) const
override
{ return readVecLaneOperand<uint8_t>(si, idx); }
/** Reads source vector 16bit operand. */
virtual ConstVecLane16
readVec16BitLaneOperand(const StaticInst *si, int idx) const
override
{ return readVecLaneOperand<uint16_t>(si, idx); }
/** Reads source vector 32bit operand. */
virtual ConstVecLane32
readVec32BitLaneOperand(const StaticInst *si, int idx) const
override
{ return readVecLaneOperand<uint32_t>(si, idx); }
/** Reads source vector 64bit operand. */
virtual ConstVecLane64
readVec64BitLaneOperand(const StaticInst *si, int idx) const
override
{ return readVecLaneOperand<uint64_t>(si, idx); }
/** Write a lane of the destination vector operand. */
template <typename LD>
void
setVecLaneOperandT(const StaticInst *si, int idx,
const LD& val)
{
numVecRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isVecReg());
return thread->setVecLane(reg, val);
}
/** Write a lane of the destination vector operand. */
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::Byte>& val) override
{ return setVecLaneOperandT(si, idx, val); }
/** Write a lane of the destination vector operand. */
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::TwoByte>& val) override
{ return setVecLaneOperandT(si, idx, val); }
/** Write a lane of the destination vector operand. */
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::FourByte>& val) override
{ return setVecLaneOperandT(si, idx, val); }
/** Write a lane of the destination vector operand. */
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::EightByte>& val) override
{ return setVecLaneOperandT(si, idx, val); }
/** @} */
/** Reads an element of a vector register. */
VecElem
readVecElemOperand(const StaticInst *si, int idx) const override
{
numVecRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isVecElem());
return thread->readVecElem(reg);
}
/** Sets an element of a vector register to a value. */
void
setVecElemOperand(const StaticInst *si, int idx,
const VecElem val) override
{
numVecRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isVecElem());
thread->setVecElem(reg, val);
}
CCReg
readCCRegOperand(const StaticInst *si, int idx) override
{
numCCRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isCCReg());
return thread->readCCReg(reg.index());
}
void
setCCRegOperand(const StaticInst *si, int idx, CCReg val) override
{
numCCRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isCCReg());
thread->setCCReg(reg.index(), val);
}
RegVal
readMiscRegOperand(const StaticInst *si, int idx) override
{
numIntRegReads++;
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isMiscReg());
return thread->readMiscReg(reg.index());
}
void
setMiscRegOperand(const StaticInst *si, int idx, RegVal val) override
{
numIntRegWrites++;
const RegId& reg = si->destRegIdx(idx);
assert(reg.isMiscReg());
thread->setMiscReg(reg.index(), val);
}
/**
* Reads a miscellaneous register, handling any architectural
* side effects due to reading that register.
*/
RegVal
readMiscReg(int misc_reg) override
{
numIntRegReads++;
return thread->readMiscReg(misc_reg);
}
/**
* Sets a miscellaneous register, handling any architectural
* side effects due to writing that register.
*/
void
setMiscReg(int misc_reg, RegVal val) override
{
numIntRegWrites++;
thread->setMiscReg(misc_reg, val);
}
PCState
pcState() const override
{
return thread->pcState();
}
void
pcState(const PCState &val) override
{
thread->pcState(val);
}
Fault
readMem(Addr addr, uint8_t *data, unsigned int size,
Request::Flags flags) override
{
return cpu->readMem(addr, data, size, flags);
}
Fault
initiateMemRead(Addr addr, unsigned int size,
Request::Flags flags) override
{
return cpu->initiateMemRead(addr, size, flags);
}
Fault
writeMem(uint8_t *data, unsigned int size, Addr addr,
Request::Flags flags, uint64_t *res) override
{
return cpu->writeMem(data, size, addr, flags, res);
}
/**
* Sets the number of consecutive store conditional failures.
*/
void
setStCondFailures(unsigned int sc_failures) override
{
thread->setStCondFailures(sc_failures);
}
/**
* Returns the number of consecutive store conditional failures.
*/
unsigned int
readStCondFailures() const override
{
return thread->readStCondFailures();
}
/**
* Executes a syscall specified by the callnum.
*/
void
syscall(int64_t callnum, Fault *fault) override
{
if (FullSystem)
panic("Syscall emulation isn't available in FS mode.");
thread->syscall(callnum, fault);
}
/** Returns a pointer to the ThreadContext. */
ThreadContext *tcBase() override { return thread->getTC(); }
/**
* Somewhat Alpha-specific function that handles returning from an
* error or interrupt.
*/
Fault hwrei() override { return thread->hwrei(); }
/**
* Check for special simulator handling of specific PAL calls. If
* return value is false, actual PAL call will be suppressed.
*/
bool
simPalCheck(int palFunc) override
{
return thread->simPalCheck(palFunc);
}
bool
readPredicate() const override
{
return thread->readPredicate();
}
void
setPredicate(bool val) override
{
thread->setPredicate(val);
if (cpu->traceData) {
cpu->traceData->setPredicate(val);
}
}
/**
* Invalidate a page in the DTLB <i>and</i> ITLB.
*/
void
demapPage(Addr vaddr, uint64_t asn) override
{
thread->demapPage(vaddr, asn);
}
void
armMonitor(Addr address) override
{
cpu->armMonitor(thread->threadId(), address);
}
bool
mwait(PacketPtr pkt) override
{
return cpu->mwait(thread->threadId(), pkt);
}
void
mwaitAtomic(ThreadContext *tc) override
{
cpu->mwaitAtomic(thread->threadId(), tc, thread->dtb);
}
AddressMonitor *
getAddrMonitor() override
{
return cpu->getCpuAddrMonitor(thread->threadId());
}
#if THE_ISA == MIPS_ISA
RegVal
readRegOtherThread(const RegId& reg, ThreadID tid=InvalidThreadID)
override
{
panic("Simple CPU models do not support multithreaded "
"register access.");
}
void
setRegOtherThread(const RegId& reg, RegVal val,
ThreadID tid=InvalidThreadID) override
{
panic("Simple CPU models do not support multithreaded "
"register access.");
}
#endif
};
#endif // __CPU_EXEC_CONTEXT_HH__