]> git.baikalelectronics.ru Git - kernel.git/commit
arm64: factor out entry stack manipulation
authorMark Rutland <mark.rutland@arm.com>
Wed, 19 Jul 2017 16:24:49 +0000 (17:24 +0100)
committerMark Rutland <mark.rutland@arm.com>
Tue, 15 Aug 2017 17:35:40 +0000 (18:35 +0100)
commit361cbbe4666fc76e5884e0632b6efd2ad2cddb92
tree4b465918a07a398066b9ad39086cf2c048254e02
parent87aa2e525f7af63f6fbbb962ef7c3feca012c897
arm64: factor out entry stack manipulation

In subsequent patches, we will detect stack overflow in our exception
entry code, by verifying the SP after it has been decremented to make
space for the exception regs.

This verification code is small, and we can minimize its impact by
placing it directly in the vectors. To avoid redundant modification of
the SP, we also need to move the initial decrement of the SP into the
vectors.

As a preparatory step, this patch introduces kernel_ventry, which
performs this decrement, and updates the entry code accordingly.
Subsequent patches will fold SP verification into kernel_ventry.

There should be no functional change as a result of this patch.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[Mark: turn into prep patch, expand commit msg]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
arch/arm64/kernel/entry.S