| Message ID | 20220207152109.197566-20-broonie@kernel.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | None | expand |
On Mon, Feb 07, 2022 at 03:20:48PM +0000, Mark Brown wrote: > 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>
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index d8aaf4b6f432..cda04fd73333 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -758,6 +758,13 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, /* TCO (Tag Check Override) always cleared for signal handlers */ regs->pstate &= ~PSR_TCO_BIT; + /* Signal handlers are invoked with ZA and streaming mode disabled */ + if (system_supports_sme()) { + current->thread.svcr &= ~(SYS_SVCR_EL0_ZA_MASK | + SYS_SVCR_EL0_SM_MASK); + sme_smstop(); + } + if (ka->sa.sa_flags & SA_RESTORER) sigtramp = ka->sa.sa_restorer; else
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> --- arch/arm64/kernel/signal.c | 7 +++++++ 1 file changed, 7 insertions(+)