arm64: alternative: Allow immediate branch as alternative instruction

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Since all 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 the target is outside of the replacement sequence).

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

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Marc Zyngier 2015-06-01 10:47:40 +01:00 • committed by Catalin Marinas

parent b0dd9c02d4

commit 7616fc8bcd

1 changed files with 66 additions and 5 deletions

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arch/arm64/kernel/alternative.c

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