x86/callthunks: Handle %rip-relative relocations in call thunk template

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Contrary to alternatives, relocations are currently not supported in
call thunk templates.  Re-use the existing infrastructure from
alternative.c to allow %rip-relative relocations when copying call
thunk template from its storage location.

The patch allows unification of ASM_INCREMENT_CALL_DEPTH, which already
uses PER_CPU_VAR macro, with INCREMENT_CALL_DEPTH, used in call thunk
template, which is currently limited to use absolute address.

Reuse existing relocation infrastructure from alternative.c.,
as suggested by Peter Zijlstra.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231105213731.1878100-3-ubizjak@gmail.com

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Uros Bizjak 2023-11-05 22:34:36 +01:00 • committed by Ingo Molnar

parent 43bda69ed9

commit 17bce3b2ae

3 changed files with 28 additions and 9 deletions

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2

arch/x86/include/asm/text-patching.h

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3

arch/x86/kernel/alternative.c

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32

arch/x86/kernel/callthunks.c

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