About stack pointers in thread_base

[jaeyong yoo]

Hello,

While I was browsing source code, I found two confusing variables:
At genode/base/include/base/thread.h
        Thread_base::Context {

                                long stack[];

                                addr_t stack_base;
        }

Although, they are commented a bit, it is hard to understand what are they
doing and what's the difference.
Could you tell me about them more?

Best,
Jaeyong
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