Java Vabase return minus value

[LittleChiu]

Java ver MPFS when i get system vabase of module, some of them will get minus value

[ufrisk]

I'm sorry for this slow answer.

Java long is a 64-bit signed value. Java does not have an unsigned data type. For Kernel style type of addresses which starts with 0xFFFF this would be represented as a negative number in Java due to signedness of java long. Similar to how a byte would be represented in Java (-128 to 127 instead of 0 to 255).

Hope this explains the issue at hand. Please let me know if this is not your issue and you believe there is a bug around this and I'll look into it.

[ufrisk]

I'm closing this issue since I believe the question was answered.

[LittleChiu]

So how could i get right value and use it to read memory？

[ufrisk]

Use the negative value. It should be correct. It's just how 64-bit values (addresses) with the topmost address part set to 0xFFFF is represented in Java.

I really with Java had a native unsigned data types to avoid confusion, but this is not the case. So just use the negative value as the valid address it is.