[Lldb-commits] [PATCH] D152516: [lldb][AArch64] Add thread local storage tpidr register

[David Spickett via Phabricator via lldb-commits]

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This register is used as the pointer to the current thread
local storage block and is read from NT_ARM_TLS on Linux.

Though tpidr will be present on all AArch64 Linux, I am soon
going to add a second register tpidr2 to this set.

tpidr is only present when SME is implemented, therefore the
NT_ARM_TLS set will change size. This is why I've added this
as a dynamic register set to save changes later.

As we can't predict exactly where the TLS data will be,
the tests modify the pointer and observe changes in the program's
behaviour based on that.

So if we read the wrong value in the first place, our modifications
wouldn't work as expected.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152516

Files:
  lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
  lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
  lldb/source/Plugins/Process/Utility/RegisterInfoPOSIX_arm64.cpp
  lldb/source/Plugins/Process/Utility/RegisterInfoPOSIX_arm64.h
  lldb/test/API/linux/aarch64/tls_register/Makefile
  lldb/test/API/linux/aarch64/tls_register/TestAArch64LinuxTLSRegister.py
  lldb/test/API/linux/aarch64/tls_register/main.c

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