From: Marc Zyngier <marc.zyngier@arm.com>
Date: Fri, 27 Mar 2015 13:09:22 +0000 (+0000)
Subject: arm64: alternative: Allow immediate branch as alternative instruction
X-Git-Tag: omap-for-v4.2/o2_dc~115^2~5
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fef7f2b2010381c795ae43743ad31931cc58f5ad;p=pandora-kernel.git

arm64: alternative: Allow immediate branch as alternative instruction

Since all immediate branches are PC-relative on Aarch64, these
instructions cannot be used as an alternative with the simplistic
approach we currently have (the immediate has been computed from
the .altinstr_replacement section, and end-up being completely off
if we insert it directly).

This patch handles the b and bl instructions in a different way,
using the insn framework to recompute the immediate, and generate
the right displacement.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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