arm64/sme: Implement signal handling for ZT

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Add a new signal context type for ZT which is present in the signal frame
when ZA is enabled and ZT is supported by the system. In order to account
for the possible addition of further ZT registers in the future we make the
number of registers variable in the ABI, though currently the only possible
number is 1. We could just use a bare list head for the context since the
number of registers can be inferred from the size of the context but for
usability and future extensibility we define a header with the number of
registers and some reserved fields in it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-11-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2023-01-16 16:04:46 +00:00 • committed by Catalin Marinas

parent 95fcec7132

commit ee072cf708

3 changed files with 124 additions and 3 deletions

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3

arch/arm64/include/asm/fpsimd.h

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19

arch/arm64/include/uapi/asm/sigcontext.h

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105

arch/arm64/kernel/signal.c

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