context::regs

[watermirror]

hi,the implemention of Context::regs() is like this:


return reinterpret_cast<Entry_frame*>(Cpu::stack_align(reinterpret_cast<Mword>(this + Size)) -1;


how this algorithm came out?i think the memory of the object is allocated by c++ compiler,  but why '(this + Size)' could get Entry_frame of a thread?
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