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Commit e28cabf1 authored by Daniel Thompson's avatar Daniel Thompson Committed by Will Deacon
Browse files

arm64: kernel: Adopt new alternative assembler macros 



Convert the dynamic patching for ARM64_WORKAROUND_845719 over to
the newly added alternative assembler macros.

Signed-off-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 271d35eb

arch/arm64/kernel/entry.S

+13 −16
Original line number Diff line number Diff line
@@ -122,26 +122,23 @@ 
	ct_user_enter

	ldr	x23, [sp, #S_SP]		// load return stack pointer

	msr	sp_el0, x23



#ifdef CONFIG_ARM64_ERRATUM_845719



#undef SEQUENCE_ORG

#undef SEQUENCE_ALT



alternative_if_not ARM64_WORKAROUND_845719

	nop

	nop

#ifdef CONFIG_PID_IN_CONTEXTIDR



#define SEQUENCE_ORG	"nop ; nop ; nop"

#define SEQUENCE_ALT	"tbz x22, #4, 1f ; mrs x29, contextidr_el1; msr contextidr_el1, x29; 1:"



	nop

#endif

alternative_else

	tbz	x22, #4, 1f

#ifdef CONFIG_PID_IN_CONTEXTIDR

	mrs	x29, contextidr_el1

	msr	contextidr_el1, x29

#else



#define SEQUENCE_ORG	"nop ; nop"

#define SEQUENCE_ALT	"tbz x22, #4, 1f ; msr contextidr_el1, xzr; 1:"



	msr contextidr_el1, xzr

#endif



	alternative_insn SEQUENCE_ORG, SEQUENCE_ALT, ARM64_WORKAROUND_845719



1:

alternative_endif

#endif

	.endif

	msr	elr_el1, x21			// set up the return data