faults.hh

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/*
 * Copyright (c) 2020 ARM Limited
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 *
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 * 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
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 */
 
#ifndef __FAULTS_HH__
#define __FAULTS_HH__
 
#include "base/types.hh"
#include "cpu/null_static_inst.hh"
#include "cpu/static_inst_fwd.hh"
#include "mem/htm.hh"
#include "sim/stats.hh"
 
namespace gem5
{
 
class ThreadContext;
 
typedef const char *FaultName;
typedef statistics::Scalar FaultStat;
 
class FaultBase
{
  public:
    virtual FaultName name() const = 0;
    virtual void invoke(ThreadContext * tc, const StaticInstPtr &inst=
                        nullStaticInstPtr);
    virtual ~FaultBase() {};
};
 
class UnimpFault : public FaultBase
{
  private:
    std::string panicStr;
  public:
    UnimpFault(std::string _str) : panicStr(_str) {}
 
    FaultName
    name() const override
    {
        return "Unimplemented simulator feature";
    }
    void invoke(ThreadContext *tc, const StaticInstPtr &inst =
                nullStaticInstPtr) override;
};
 
// A fault to trigger a system call in SE mode.
class SESyscallFault : public FaultBase
{
    const char *name() const override { return "syscall_fault"; }
 
    void invoke(ThreadContext *tc, const StaticInstPtr &inst=
            nullStaticInstPtr) override;
};
 
class ReExec : public FaultBase
{
  public:
    virtual FaultName name() const override { return "Re-execution fault"; }
    void invoke(ThreadContext *tc, const StaticInstPtr &inst=
                nullStaticInstPtr) override;
};
 
/*
 * This class is needed to allow system call retries to occur for blocking
 * system calls in SE mode. A retry fault will be generated by the system call
 * emulation code if blocking conditions arise; the fault is passed up the
 * function call chain into the CPU model where it is handled by retrying the
 * syscall instruction on a later tick.
 */
class SyscallRetryFault : public FaultBase
{
  public:
    FaultName name() const override { return "System call retry fault"; }
    SyscallRetryFault() {}
    void invoke(ThreadContext *tc, const StaticInstPtr &inst=
                nullStaticInstPtr) override;
};
 
class GenericPageTableFault : public FaultBase
{
  private:
    Addr vaddr;
  public:
    FaultName name() const override { return "Generic page table fault"; }
    GenericPageTableFault(Addr va) : vaddr(va) {}
    void invoke(ThreadContext *tc, const StaticInstPtr &inst=
                nullStaticInstPtr) override;
    Addr getFaultVAddr() const { return vaddr; }
};
 
class GenericAlignmentFault : public FaultBase
{
  private:
    Addr vaddr;
  public:
    FaultName name() const override { return "Generic alignment fault"; }
    GenericAlignmentFault(Addr va) : vaddr(va) {}
    void invoke(ThreadContext *tc, const StaticInstPtr &inst=
                nullStaticInstPtr) override;
    Addr getFaultVAddr() const { return vaddr; }
};
 
class GenericHtmFailureFault : public FaultBase
{
  protected:
    uint64_t htmUid; // unique identifier used for debugging
    HtmFailureFaultCause cause;
 
  public:
    GenericHtmFailureFault(uint64_t htm_uid, HtmFailureFaultCause _cause)
      : htmUid(htm_uid), cause(_cause)
    {}
 
    FaultName name() const override { return "Generic HTM failure fault"; }
 
    uint64_t getHtmUid() const { return htmUid; }
    HtmFailureFaultCause getHtmFailureFaultCause() const { return cause; }
    void invoke(ThreadContext *tc, const StaticInstPtr &inst =
                nullStaticInstPtr) override;
};
 
} // namespace gem5
 
#endif // __FAULTS_HH__