ARM: 8671/1: V7M: Preserve registers across switch from Thread to Handler mode

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According to ARMv7 ARM, when exception is taken content of r0-r3, r12
is unknown (see ExceptionTaken() pseudocode). Even though existent
implementations keep these register unchanged, preserve them to be in
line with architecture.

Reported-by: Dobromir Stefanov <dobromir.stefanov@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

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Vladimir Murzin 2017-04-24 10:41:53 +01:00 • committed by Russell King

parent 6f05d0761a

commit b70cd406d7

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arch/arm/mm/proc-v7m.S

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