arm64/sme: Disable ZA and streaming mode when handling signals
The ABI requires that streaming mode and ZA are disabled when invoking signal handlers, do this in setup_return() when we prepare the task state for the signal handler. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220419112247.711548-18-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -759,6 +759,13 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
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/* TCO (Tag Check Override) always cleared for signal handlers */
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regs->pstate &= ~PSR_TCO_BIT;
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/* Signal handlers are invoked with ZA and streaming mode disabled */
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if (system_supports_sme()) {
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current->thread.svcr &= ~(SYS_SVCR_EL0_ZA_MASK |
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SYS_SVCR_EL0_SM_MASK);
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sme_smstop();
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}
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if (ka->sa.sa_flags & SA_RESTORER)
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sigtramp = ka->sa.sa_restorer;
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else
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