Hi all,
There is a dedicated register for store and restoring the OS thread context informations in ARMV8. What is the advantage of it and what is the use case of the same ??
They are instead of a dedicated platform register in the ABI and would normally point to a thread local storage structure. When you've got threads in a single process they all share the same address space and you need a simple way of getting to thread local storage. The same sort of thing is also used in microcontrollers that don't have an MMU. One could set up a location that held the current pointer whenever the thread changed but really you want this sort of thing to be both fast and safe. On x86 they finally found a use for their old segment registers facility by using one for this purpose.