From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>
Cc: Alan Hayward <alan.hayward@arm.com>,
Luis Machado <luis.machado@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH v1 2/4] arm64/ptrace: Document extension of NT_ARM_TLS to cover TPIDR2_EL0
Date: Mon, 4 Jul 2022 19:13:30 +0100 [thread overview]
Message-ID: <20220704181332.3318214-3-broonie@kernel.org> (raw)
In-Reply-To: <20220704181332.3318214-1-broonie@kernel.org>
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>
---
Documentation/arm64/sme.rst | 3 +++
1 file changed, 3 insertions(+)
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
--------------------------------
--
2.30.2
next prev parent reply other threads:[~2022-07-04 18:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-04 18:13 [PATCH v1 0/4] arm64/sme: ptrace support for TPIDR2_EL0 Mark Brown
2022-07-04 18:13 ` [PATCH v1 1/4] kselftest/arm64: Add test coverage for NT_ARM_TLS Mark Brown
2022-07-04 18:13 ` Mark Brown [this message]
2022-07-04 18:13 ` [PATCH v1 3/4] arm64/ptrace: Support access to TPIDR2_EL0 Mark Brown
2022-07-04 18:13 ` [PATCH v1 4/4] kselftest/arm64: Add coverage of TPIDR2_EL0 ptrace interface Mark Brown
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