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ARM: 8670/1: V7M: Do not corrupt vector table around v7m_invalidate_l1 call
We save/restore registers around v7m_invalidate_l1 to address pointed
by r12, which is vector table, so the first eight entries are
overwritten with a garbage. We already have stack setup at that stage,
so use it to save/restore register.
Fixes: 6a8146f420
("ARM: 8609/1: V7M: Add support for the Cortex-M7 processor")
Cc: <stable@vger.kernel.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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@ -147,10 +147,10 @@ __v7m_setup_cont:
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@ Configure caches (if implemented)
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@ Configure caches (if implemented)
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teq r8, #0
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teq r8, #0
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stmneia r12, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
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stmneia sp, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
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blne v7m_invalidate_l1
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blne v7m_invalidate_l1
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teq r8, #0 @ re-evalutae condition
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teq r8, #0 @ re-evalutae condition
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ldmneia r12, {r0-r6, lr}
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ldmneia sp, {r0-r6, lr}
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@ Configure the System Control Register to ensure 8-byte stack alignment
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@ Configure the System Control Register to ensure 8-byte stack alignment
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@ Note the STKALIGN bit is either RW or RAO.
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@ Note the STKALIGN bit is either RW or RAO.
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