guest_abi.hh

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/*
 * Copyright 2019 Google Inc.
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#ifndef __SIM_GUEST_ABI_HH__
#define __SIM_GUEST_ABI_HH__
 
#include <functional>
 
#include "sim/guest_abi/definition.hh"
#include "sim/guest_abi/dispatch.hh"
#include "sim/guest_abi/layout.hh"
#include "sim/guest_abi/varargs.hh"
 
namespace gem5
{
 
class ThreadContext;
 
// These functions wrap a simulator level function with the given signature.
// The wrapper takes one argument, a thread context to extract arguments from
// and write a result (if any) back to. For convenience, the wrapper also
// returns the result of the wrapped function.
 
template <typename ABI, bool store_ret, typename Ret, typename ...Args>
Ret
invokeSimcall(ThreadContext *tc,
              std::function<Ret(ThreadContext *, Args...)> target)
{
    // Default construct a State to track consumed resources. Built in
    // types will be zero initialized.
    auto state = guest_abi::initializeState<ABI>(tc);
    guest_abi::prepareForFunction<ABI, Ret, Args...>(tc, state);
    return guest_abi::callFrom<ABI, Ret, store_ret, Args...>(tc, state,
        target);
}
 
template <typename ABI, typename Ret, typename ...Args>
Ret
invokeSimcall(ThreadContext *tc,
              std::function<Ret(ThreadContext *, Args...)> target)
{
    return invokeSimcall<ABI, true>(tc, target);
}
 
template <typename ABI, bool store_ret, typename Ret, typename ...Args>
Ret
invokeSimcall(ThreadContext *tc, Ret (*target)(ThreadContext *, Args...))
{
    return invokeSimcall<ABI, store_ret>(
            tc, std::function<Ret(ThreadContext *, Args...)>(target));
}
 
template <typename ABI, typename Ret, typename ...Args>
Ret
invokeSimcall(ThreadContext *tc, Ret (*target)(ThreadContext *, Args...))
{
    return invokeSimcall<ABI, true>(tc, target);
}
 
template <typename ABI, typename ...Args>
void
invokeSimcall(ThreadContext *tc,
              std::function<void(ThreadContext *, Args...)> target)
{
    // Default construct a State to track consumed resources. Built in
    // types will be zero initialized.
    auto state = guest_abi::initializeState<ABI>(tc);
    guest_abi::prepareForArguments<ABI, Args...>(tc, state);
    guest_abi::callFrom<ABI, void, false, Args...>(tc, state, target);
}
 
template <typename ABI, typename ...Args>
void
invokeSimcall(ThreadContext *tc, void (*target)(ThreadContext *, Args...))
{
    invokeSimcall<ABI>(
            tc, std::function<void(ThreadContext *, Args...)>(target));
}
 
 
// These functions also wrap a simulator level function. Instead of running the
// function, they return a string which shows what arguments the function would
// be invoked with if it were called from the given context.
 
template <typename ABI, typename Ret, typename ...Args>
std::string
dumpSimcall(std::string name, ThreadContext *tc,
            std::function<Ret(ThreadContext *, Args...)> target=
            std::function<Ret(ThreadContext *, Args...)>())
{
    auto state = guest_abi::initializeState<ABI>(tc);
    std::ostringstream ss;
 
    guest_abi::prepareForFunction<ABI, Ret, Args...>(tc, state);
    ss << name;
    guest_abi::dumpArgsFrom<ABI, Ret, Args...>(ss, tc, state);
    return ss.str();
}
 
template <typename ABI, typename Ret, typename ...Args>
std::string
dumpSimcall(std::string name, ThreadContext *tc,
            Ret (*target)(ThreadContext *, Args...))
{
    return dumpSimcall<ABI>(
            name, tc, std::function<Ret(ThreadContext *, Args...)>(target));
}
 
} // namespace gem5
 
#endif // __SIM_GUEST_ABI_HH__