Commit 6d805949 authored Apr 24, 2017 by Vladimir Murzin Committed by Russell King Apr 26, 2017

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: 6a8146f4 ("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>

parent 3872fe83

arch/arm/mm/proc-v7m.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -147,10 +147,10 @@ __v7m_setup_cont:

		@ Configure caches (if implemented)
		teq r8, #0
		stmneia r12, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
		stmneia sp, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
		blne v7m_invalidate_l1
		teq r8, #0 @ re-evalutae condition
		ldmneia r12, {r0-r6, lr}
		ldmneia sp, {r0-r6, lr}

		@ Configure the System Control Register to ensure 8-byte stack alignment
		@ Note the STKALIGN bit is either RW or RAO.

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