pseudo_inst_abi.hh

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#include "arch/x86/registers.hh"
#include "sim/guest_abi.hh"

struct X86PseudoInstABI
{
    using Position = int;
};

namespace GuestABI
{

template <typename T>
struct Result<X86PseudoInstABI, T>
{
    static void
    store(ThreadContext *tc, const T &ret)
    {
        // This assumes that all pseudo ops have their return value set
        // by the pseudo op instruction. This may need to be revisited if we
        // modify the pseudo op ABI in util/m5/m5op_x86.S
        tc->setIntReg(X86ISA::INTREG_RAX, ret);
    }
};

template <>
struct Argument<X86PseudoInstABI, uint64_t>
{
    static uint64_t
    get(ThreadContext *tc, X86PseudoInstABI::Position &position)
    {
        // The first 6 integer arguments are passed in registers, the rest
        // are passed on the stack.

        panic_if(position >= 6, "Too many psuedo inst arguments.");

        using namespace X86ISA;

        const int int_reg_map[] = {
            INTREG_RDI, INTREG_RSI, INTREG_RDX,
            INTREG_RCX, INTREG_R8, INTREG_R9
        };

        return tc->readIntReg(int_reg_map[position++]);
    }
};

} // namespace GuestABI