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| author | Mark Brown <broonie@kernel.org> | 2022-08-29 16:49:19 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2022-09-21 17:26:58 +0100 |
| commit | f285da05c62a429f1978c5520cf069d483a7d9af (patch) | |
| tree | ea5ea993037c19f58324b882938cfe4bad875857 /Documentation/arm64/sme.rst | |
| parent | ecaf4d3f734fe8d10aeda52193d325453e3e84ee (diff) | |
| download | lwn-f285da05c62a429f1978c5520cf069d483a7d9af.tar.gz lwn-f285da05c62a429f1978c5520cf069d483a7d9af.zip | |
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: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220829154921.837871-3-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/arm64/sme.rst')
| -rw-r--r-- | Documentation/arm64/sme.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/arm64/sme.rst b/Documentation/arm64/sme.rst index 937147f58cc5..16d2db4c2e2e 100644 --- a/Documentation/arm64/sme.rst +++ b/Documentation/arm64/sme.rst @@ -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 -------------------------------- |