/*
 * Copyright 2020 Google Inc.
 *
 * 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_LINUX_SE_WORKLOAD_HH__
#define __ARCH_ARM_LINUX_SE_WORKLOAD_HH__

#include "arch/arm/linux/linux.hh"
#include "arch/arm/page_size.hh"
#include "arch/arm/regs/int.hh"
#include "arch/arm/se_workload.hh"
#include "params/ArmEmuLinux.hh"
#include "sim/syscall_desc.hh"

namespace gem5
{

namespace ArmISA
{

class EmuLinux : public SEWorkload
{
  public:
    using Params = ArmEmuLinuxParams;

    EmuLinux(const Params &p) : SEWorkload(p, PageShift) {}
    ByteOrder byteOrder() const override { return ByteOrder::little; }

    struct BaseSyscallABI {};
    struct SyscallABI32 : public SEWorkload::SyscallABI32,
                          public BaseSyscallABI
    {};
    struct SyscallABI64 : public SEWorkload::SyscallABI64,
                          public BaseSyscallABI
    {};

    void syscall(ThreadContext *tc) override;
};

} // namespace ArmISA

namespace guest_abi
{

template <typename ABI>
struct Result<ABI, SyscallReturn,
    typename std::enable_if_t<std::is_base_of_v<
        ArmISA::EmuLinux::BaseSyscallABI, ABI>>>
{
    static void
    store(ThreadContext *tc, const SyscallReturn &ret)
    {
        tc->setReg(ArmISA::ReturnValueReg, ret.encodedValue());
        if (ret.count() > 1)
            tc->setReg(ArmISA::SyscallPseudoReturnReg, ret.value2());
    }
};

} // namespace guest_abi
} // namespace gem5

#endif // __ARCH_ARM_LINUX_SE_WORKLOAD_HH__