On Tue, 27 Dec 2022 14:20:40 +0000, Mark Brown wrote:
When SME support was merged support for TPIDR2 in signal frames was omitted, meaning that it was not possible for signal handers to inspect or modify it. This will present an issue for programs using signals to implement lightweight threads so let's provide access to TPIDR2 in signal handlers.
Implement a new record type for TPIDR2 using the same format as we use for ESR and add coverage to make sure that this appears in the signal context as expected. Due to TPIDR2 being reserved for libc we only validate that the value is unchanged, meaning we're likely to just be validating the default value of 0 on current systems. I have tested with a modified version that sets an explicit value.
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Applied to arm64 (for-next/tpidr2), thanks!
[1/4] arm64/sme: Document ABI for TPIDR2 signal information https://git.kernel.org/arm64/c/17d0c4a27b2a [2/4] arm64/signal: Include TPIDR2 in the signal context https://git.kernel.org/arm64/c/39e54499280f [3/4] kselftest/arm64: Add TPIDR2 to the set of known signal context records https://git.kernel.org/arm64/c/bae393dabf35 [4/4] kselftest/arm64: Add test case for TPIDR2 signal frame records https://git.kernel.org/arm64/c/8ced92801935
I'll look at the signal handling clean-up patches as well but they probably conflicts with this series and may need to be rebased on top.