src/arch/x86/linux/se_workload.hh

/*
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 * to a hardware implementation of the functionality of the software
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 *
 * Copyright 2020 Google Inc.
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 * 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;
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 * this software without specific prior written permission.
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#ifndef __ARCH_X86_LINUX_SE_WORKLOAD_HH__
#define __ARCH_X86_LINUX_SE_WORKLOAD_HH__

#include "arch/x86/linux/linux.hh"
#include "arch/x86/remote_gdb.hh"
#include "params/X86EmuLinux.hh"
#include "sim/process.hh"
#include "sim/se_workload.hh"
#include "sim/syscall_abi.hh"
#include "sim/syscall_desc.hh"

namespace gem5
{

namespace X86ISA
{

class EmuLinux : public SEWorkload
{
  public:
    using Params = X86EmuLinuxParams;

    EmuLinux(const Params &p);

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

    loader::Arch getArch() const override { return loader::X86_64; }
    ByteOrder byteOrder() const override { return ByteOrder::little; }

    void syscall(ThreadContext *tc) override;
    void event(ThreadContext *tc) override;

    void pageFault(ThreadContext *tc);

    struct SyscallABI64 :
        public GenericSyscallABI64, public X86Linux::SyscallABI
    {
        static const std::vector<IntRegIndex> ArgumentRegs;
    };

    struct SyscallABI32 :
        public GenericSyscallABI32, public X86Linux::SyscallABI
    {
        static const std::vector<IntRegIndex> ArgumentRegs;
    };

  private:
    static SyscallDescTable<SyscallABI64> syscallDescs64;
    static SyscallDescTable<SyscallABI32> syscallDescs32;
};

} // namespace X86ISA

GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
namespace guest_abi
{

template <typename Arg>
struct Argument<X86ISA::EmuLinux::SyscallABI32, Arg,
    typename std::enable_if_t<std::is_integral_v<Arg> &&
        X86ISA::EmuLinux::SyscallABI32::IsWideV<Arg>>>
{
    using ABI = X86ISA::EmuLinux::SyscallABI32;

    static Arg
    get(ThreadContext *tc, typename ABI::State &state)
    {
        panic_if(state + 1 >= ABI::ArgumentRegs.size(),
                "Ran out of syscall argument registers.");
        auto low = ABI::ArgumentRegs[state++];
        auto high = ABI::ArgumentRegs[state++];
        return (Arg)ABI::mergeRegs(tc, low, high);
    }
};

} // namespace guest_abi
} // namespace gem5

#endif // __ARCH_X86_LINUX_SE_WORKLOAD_HH__