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ARM: 9197/1: spectre-bhb: fix loop8 sequence for Thumb2
authorArd Biesheuvel <ardb@kernel.org>
Wed, 20 Apr 2022 08:46:17 +0000 (09:46 +0100)
committerRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Wed, 18 May 2022 10:38:47 +0000 (11:38 +0100)
commit3cfb3019979666bdf33a1010147363cf05e0f17b
tree00584b7790f30d7c396b42c5e34ff0fbfa071703tree | snapshot
parent0dc14aa94ccd8ba35eb17a0f9b123d1566efd39ecommit | diff
ARM: 9197/1: spectre-bhb: fix loop8 sequence for Thumb2

In Thumb2, 'b . + 4' produces a branch instruction that uses a narrow
encoding, and so it does not jump to the following instruction as
expected. So use W(b) instead.

Fixes: 6c7cb60bff7a ("ARM: fix Thumb2 regression with Spectre BHB")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
arch/arm/kernel/entry-armv.S diff | blob | history
Domain: System / Kernel;