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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: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Daniel Thompson 2015-07-22 12:21:03 +01:00 committed by Will Deacon
parent 271d35eb77
commit e28cabf123
1 changed files with 14 additions and 17 deletions
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31
arch/arm64/kernel/entry.S
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@ -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:"
#else
#define SEQUENCE_ORG "nop ; nop"
#define SEQUENCE_ALT "tbz x22, #4, 1f ; msr contextidr_el1, xzr; 1:"
nop
#endif
alternative_insn SEQUENCE_ORG, SEQUENCE_ALT, ARM64_WORKAROUND_845719
alternative_else
tbz x22, #4, 1f
#ifdef CONFIG_PID_IN_CONTEXTIDR
mrs x29, contextidr_el1
msr contextidr_el1, x29
#else
msr contextidr_el1, xzr
#endif
1:
alternative_endif
#endif
.endif
msr elr_el1, x21 // set up the return data