Commit f285da05 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

arm64/ptrace: Document extension of NT_ARM_TLS to cover TPIDR2_EL0 



In order to allow debuggers to discover lazily saved SME state we need
to provide access to TPIDR2_EL0, we will extend the existing NT_ARM_TLS
used for TPIDR to also include TPIDR2_EL0 as the second register in the
regset.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220829154921.837871-3-broonie@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent ecaf4d3f

Documentation/arm64/sme.rst

+3 −0
Original line number Diff line number Diff line
@@ -331,6 +331,9 @@ The regset data starts with struct user_za_header, containing: 
  been read if a PTRACE_GETREGSET of NT_ARM_ZA were executed for each thread

  when the coredump was generated.



* The NT_ARM_TLS note will be extended to two registers, the second register

  will contain TPIDR2_EL0 on systems that support SME and will be read as

  zero with writes ignored otherwise.



9.  System runtime configuration

--------------------------------