src/arch/arm/fs_workload.hh

/*
 * Copyright (c) 2010, 2012-2013, 2015-2019 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __ARCH_ARM_FS_WORKLOAD_HH__
#define __ARCH_ARM_FS_WORKLOAD_HH__

#include <memory>
#include <vector>

#include "arch/arm/aapcs32.hh"
#include "arch/arm/aapcs64.hh"
#include "arch/arm/remote_gdb.hh"
#include "kern/linux/events.hh"
#include "params/ArmFsWorkload.hh"
#include "sim/kernel_workload.hh"
#include "sim/sim_object.hh"

namespace gem5
{

namespace ArmISA
{

class SkipFunc : public SkipFuncBase
{
  public:
    using SkipFuncBase::SkipFuncBase;
    void returnFromFuncIn(ThreadContext *tc) override;
};

class FsWorkload : public KernelWorkload
{
  protected:
    /** Bootloaders */
    std::vector<std::unique_ptr<loader::ObjectFile>> bootLoaders;

    /**
     * Pointer to the bootloader object
     */
    loader::ObjectFile *bootldr = nullptr;

    /**
     * This differs from entry since it takes into account where
     * the kernel is loaded in memory (with loadAddrMask and
     * loadAddrOffset).
     */
    Addr kernelEntry = 0;

    /**
     * Get a boot loader that matches the kernel.
     *
     * @param obj Kernel binary
     * @return Pointer to boot loader ObjectFile or nullptr if there
     *         is no matching boot loader.
     */
    loader::ObjectFile *getBootLoader(loader::ObjectFile *const obj);

    template <template <class ABI, class Base> class FuncEvent,
             typename... Args>
    PCEvent *
    addSkipFunc(Args... args)
    {
        if (getArch() == loader::Arm64) {
            return addKernelFuncEvent<FuncEvent<Aapcs64, SkipFunc>>(
                    std::forward<Args>(args)...);
        } else {
            return addKernelFuncEvent<FuncEvent<Aapcs32, SkipFunc>>(
                    std::forward<Args>(args)...);
        }
    }

    template <template <class ABI, class Base> class FuncEvent,
             typename... Args>
    PCEvent *
    addSkipFuncOrPanic(Args... args)
    {
        if (getArch() == loader::Arm64) {
            return addKernelFuncEventOrPanic<FuncEvent<Aapcs64, SkipFunc>>(
                    std::forward<Args>(args)...);
        } else {
            return addKernelFuncEventOrPanic<FuncEvent<Aapcs32, SkipFunc>>(
                    std::forward<Args>(args)...);
        }
    }

  public:
    PARAMS(ArmFsWorkload);

    Addr
    getEntry() const override
    {
        if (bootldr)
            return bootldr->entryPoint();
        else
            return kernelEntry;
    }

    loader::Arch
    getArch() const override
    {
        if (bootldr)
            return bootldr->getArch();
        else if (kernelObj)
            return kernelObj->getArch();
        else
            return loader::Arm64;
    }

    ByteOrder byteOrder() const override { return ByteOrder::little; }

    FsWorkload(const Params &p);

    void initState() override;

    void
    setSystem(System *sys) override
    {
        KernelWorkload::setSystem(sys);
        gdb = BaseRemoteGDB::build<RemoteGDB>(system);
    }

    Addr
    fixFuncEventAddr(Addr addr) const override
    {
        // Remove the low bit that thumb symbols have set
        // but that aren't actually odd aligned
        return addr & ~1;
    }
};

} // namespace ArmISA
} // namespace gem5

#endif // __ARCH_ARM_FS_WORKLOAD_HH__