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struct InterruptContext
{
    ...
    // iret frame
    uint32_t eip;
    uint32_t cs;
    uint32_t eflags;
    // These are only saved/restored when crossing privilege levels
    uint32_t esp;
    uint32_t ss;
};

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struct InterruptContext
{
    ...
    // iret frame
    uint64_t rip;
    uint64_t cs;
    uint64_t rflags;
    // These are always valid (different behaviour than 32 bits mode)
    uint64_t rsp;
    uint64_t ss;
};