arm64: kernel: do not need to reset UAO on exception entry

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Commit e19a6ee246 ("arm64: kernel: Save and restore UAO and
addr_limit on exception entry") states that exception handler inherits
the original PSTATE.UAO value, so UAO needes to be reset
explicitly. However, ARM 8.2 Extension documentation says:

PSTATE.UAO is copied to SPSR_ELx.UAO and is then set to 0 on an
exception taken from AArch64 to AArch64

so hardware already does the right thing.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

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Vladimir Murzin 2016-09-01 14:35:59 +01:00 • committed by Will Deacon

parent e937dd5782

commit 563cada03d

1 changed files with 1 additions and 1 deletions

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arch/arm64/kernel/entry.S

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