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| author |   Mark Brown <broonie@kernel.org> | 2022-04-19 12:22:25 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2022-04-22 18:51:08 +0100 |
| commit | 40a8e87bb32855b39839d35b5b5b125494b3a604 (patch) | |
| tree | fd4d7f65eb19a306cd43192eb8ca582ae99843c5 /arch/arm64/kernel/signal.c | |
| parent | arm64/sme: Implement traps and syscall handling for SME (diff) | |
| download | linux-dev-40a8e87bb32855b39839d35b5b5b125494b3a604.tar.xz linux-dev-40a8e87bb32855b39839d35b5b5b125494b3a604.zip | |
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>
Diffstat (limited to 'arch/arm64/kernel/signal.c')
| -rw-r--r-- | arch/arm64/kernel/signal.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 4a4122ef6f39..42efa464e46e 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -759,6 +759,13 @@ 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 |