我用SYSCALL_INDEX宏 能够 取到ZwOpenProcess的index

#define SYSCALL_INDEX(_Function) *(PULONG)((PUCHAR)_Function+1)

NTSYSAPI NTSTATUS NTAPI ZwOpenProcess (
    OUT PHANDLE ProcessHandle,
    IN ACCESS_MASK DesiredAccess,
    IN POBJECT_ATTRIBUTES ObjectAttributes,
    IN PCLIENT_ID ClientId OPTIONAL);

g_nOpenIndex = SYSCALL_INDEX(ZwOpenProcess);
DbgPrint("g_nOpenIndex=%X", g_nOpenIndex);

这段代码能返回 g_nOpenIndex=7A

同样的代码，我定义
NTSYSAPI NTSTATUS NTAPI ZwReadVirtualMemory(
    IN HANDLE ProcessHandle,
    IN PVOID BaseAddress,
    OUT PVOID Buffer,
    IN ULONG BufferLength,
    OUT PULONG ReturnLength OPTIONAL);
g_nReadIndex = SYSCALL_INDEX(ZwReadVirtualMemory);
DbgPrint("g_nReadIndex=%X", g_nReadIndex);
代码能够正常编译，产生sys文件。
但是我在加载sys文件的时候会出错,本人新接触驱动，不知如何调试sys.

各位大大指导一下，是什么地方出现的问题？  sys文件要怎么才能调试？

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