typedef struct DECLSPEC_ALIGN(16) _CONTEXT {

    //
    // Register parameter home addresses.
    //
    // N.B. These fields are for convience - they could be used to extend the
    //      context record in the future.
    //

    DWORD64 P1Home;
    DWORD64 P2Home;
    DWORD64 P3Home;
    DWORD64 P4Home;
    DWORD64 P5Home;
    DWORD64 P6Home;

    //
    // Control flags.
    //

    DWORD ContextFlags;
    DWORD MxCsr;

    //
    // Segment Registers and processor flags.
    //

    WORD   SegCs;
    WORD   SegDs;
    WORD   SegEs;
    WORD   SegFs;
    WORD   SegGs;
    WORD   SegSs;
    DWORD EFlags;

    //
    // Debug registers
    //

    DWORD64 Dr0;
    DWORD64 Dr1;
    DWORD64 Dr2;
    DWORD64 Dr3;
    DWORD64 Dr6;
    DWORD64 Dr7;

    //
    // Integer registers.
    //

    DWORD64 Rax;
    DWORD64 Rcx;
    DWORD64 Rdx;
    DWORD64 Rbx;
    DWORD64 Rsp;
    DWORD64 Rbp;
    DWORD64 Rsi;
    DWORD64 Rdi;
    DWORD64 R8;
    DWORD64 R9;
    DWORD64 R10;
    DWORD64 R11;
    DWORD64 R12;
    DWORD64 R13;
    DWORD64 R14;
    DWORD64 R15;

    //
    // Program counter.
    //

    DWORD64 Rip;

    //
    // Floating point state.
    //

    union {
        XMM_SAVE_AREA32 FltSave;
        struct {
            M128A Header[2];
            M128A Legacy[8];
            M128A Xmm0;
            M128A Xmm1;
            M128A Xmm2;
            M128A Xmm3;
            M128A Xmm4;
            M128A Xmm5;
            M128A Xmm6;
            M128A Xmm7;
            M128A Xmm8;
            M128A Xmm9;
            M128A Xmm10;
            M128A Xmm11;
            M128A Xmm12;
            M128A Xmm13;
            M128A Xmm14;
            M128A Xmm15;
        } DUMMYSTRUCTNAME;
    } DUMMYUNIONNAME;

    //
    // Vector registers.
    //

    M128A VectorRegister[26];
    DWORD64 VectorControl;

    //
    // Special debug control registers.
    //

    DWORD64 DebugControl;
    DWORD64 LastBranchToRip;
    DWORD64 LastBranchFromRip;
    DWORD64 LastExceptionToRip;
    DWORD64 LastExceptionFromRip;
} CONTEXT, *PCONTEXT;